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+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
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+
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+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/COPYING.SGI b/COPYING.SGI
new file mode 100644
index 0000000..94ab8db
--- /dev/null
+++ b/COPYING.SGI
@@ -0,0 +1,40 @@
+The data and some of the control logic for the "ideas" scene was adapted from
+the "Ideas in Motion" GLUT demo.  Per the rights granted by the source for that
+demo, the following notice is reproduced here:
+
+/*
+ * (c) Copyright 1993, Silicon Graphics, Inc.
+ * ALL RIGHTS RESERVED 
+ * Permission to use, copy, modify, and distribute this software for 
+ * any purpose and without fee is hereby granted, provided that the above
+ * copyright notice appear in all copies and that both the copyright notice
+ * and this permission notice appear in supporting documentation, and that 
+ * the name of Silicon Graphics, Inc. not be used in advertising
+ * or publicity pertaining to distribution of the software without specific,
+ * written prior permission. 
+ *
+ * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
+ * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
+ * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
+ * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
+ * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
+ * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
+ * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
+ * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN
+ * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
+ * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
+ * 
+ * US Government Users Restricted Rights 
+ * Use, duplication, or disclosure by the Government is subject to
+ * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
+ * (c)(1)(ii) of the Rights in Technical Data and Computer Software
+ * clause at DFARS 252.227-7013 and/or in similar or successor
+ * clauses in the FAR or the DOD or NASA FAR Supplement.
+ * Unpublished-- rights reserved under the copyright laws of the
+ * United States.  Contractor/manufacturer is Silicon Graphics,
+ * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311.
+ *
+ * OpenGL(TM) is a trademark of Silicon Graphics, Inc.
+ */
diff --git a/INSTALL b/INSTALL
new file mode 100644
index 0000000..4f65d23
--- /dev/null
+++ b/INSTALL
@@ -0,0 +1,13 @@
+glmark2 uses the WAF build system.
+
+To configure glmark2 use:
+
+$ ./waf configure [--enable-gl --enable-glesv2 --enable-gl-drm --enable-glesv2-drm --data-path=DATA_PATH --prefix=PREFIX]
+
+To build use:
+
+$ ./waf
+
+To install use:
+
+$ ./waf install --destdir=DESTDIR
diff --git a/INSTALL.android b/INSTALL.android
new file mode 100644
index 0000000..c4ca070
--- /dev/null
+++ b/INSTALL.android
@@ -0,0 +1,35 @@
+The minimum Android API level for glmark2 is 9 (>= Android 2.3).
+
+Building using the SDK and NDK
+------------------------------
+
+To build and install glmark2 you need the Android SDK and NDK. The 'android',
+'adb' and 'ndk-build' tools used below are included there.
+
+To build glmark2 for Android we start by building the native part:
+
+$ cd android
+$ ndk-build
+
+To continue building the package from the command line:
+
+$ android update project -p . -s
+$ ant debug {or release}
+
+To install to a device, you need to have set up an ADB connection
+to the device. Then do:
+
+$ adb install bin/Glmark2Activity-debug.apk
+
+Alternatively you can load the project (in the android/ directory) in Eclipse
+using the ADT plugin and manage the build and install process from there.  Keep
+in mind that when updating the native build (ndk-build etc) you need to refresh
+the Eclipse project, otherwise it won't notice that something has changed.
+
+Building using the Android build system
+---------------------------------------
+
+Copy the glmark2 source tree to somewhere the Android build system can access
+it (eg external/glmark2) and build the GLMark2 module:
+
+$ make GLMark2
diff --git a/NEWS b/NEWS
new file mode 100644
index 0000000..9fcd54e
--- /dev/null
+++ b/NEWS
@@ -0,0 +1,208 @@
+glmark2 2012.12 (20121218)
+==========================
+
+* Add a refraction (2 interface) and reflection benchmark (scene 'reflect').
+* Add a new canvas object which allows rendering to GBM managed surfaces
+  and page flipping to DRM managed framebuffer from a console.
+* Enhancements to visual config mechanism to consider stencil size in the
+  selection criteria and to query all config attribs.
+
+glmark2 2012.11 (20121126)
+==========================
+
+* Add a shadow mapping benchmark (scene 'shadow').
+* Consolidate EGL interactions into a separate state object.
+
+glmark2 2012.08 (20120817)
+==========================
+
+* Display benchmark results in the Android GUI.
+* Add an Android option menu offering load/save/delete benchmark list
+  functionality, access to last benchmark results, settings and
+  information about glmark2.
+* Properly handle spaces in scene options on Android.
+* Exclude from score calculation benchmarks whose set up wasn't successful.
+* Display an appropriate message (instead of a 0 FPS value) if benchmark
+  set up isn't successful.
+* Add support for standard GNU installation directories.
+
+glmark2 2012.07 (20120719)
+==========================
+
+* Add Android GUI for defining and running benchmarks.
+* Add benchmark based on the WebGL jellyfish demo (scene 'jellyfish').
+* Add benchmark based on the WebGL dynamic terrain demo (scene 'terrain').
+* Extend texture scene with the option to compute texture coordinates
+  in the shader (option 'texgen').
+* Add support for reading texture data from JPEG files.
+* Properly support options that have a finite set of acceptable values.
+
+glmark2 2012.06 (20120621)
+==========================
+
+* Add command-line option to render in fullscreen mode (--fullscreen).
+* Display the frame time in addition to the FPS for each benchmark.
+
+glmark2 2012.05 (20120524)
+==========================
+
+* Add benchmark based on the SGI "Ideas in Motion" demo.
+* Ensure that the framebuffer is drawn opaquely.
+* Add command-line option to configure the visual used for rendering
+  (--visual-config).
+* Add support for additional models and textures in the 'texture' scene.
+
+glmark2 2012.03 (20120322)
+==========================
+
+* X11:
+  - Support rendering to an off-screen surface (--off-screen).
+  - Add command-line option to select which method to use to "end"
+    a frame (--frame-end).
+
+glmark2 2012.02 (20120216)
+==========================
+
+* Consolidate X11 and Android main loops.
+* Accept command-line options on Android through either a file
+  ('/data/glmark2/args') or an extra intent key ('args').
+* Support per-scene options for displaying an FPS count on screen
+  (show-fps, fps-pos, fps-size), and remove --show-fps command-line option.
+* Support per-scene options for displaying a benchmark title on screen
+  (title, title-pos, title-size).
+* Add command-line option to run benchmarks indefinitely (--run-forever).
+* Add command-line option to annotate the benchmarks with on-screen
+  information (--annotate == -b :show-fps=true:title=#info#).
+* Move various utility classes to libmatrix.
+* Fix build issues on Android ICS.
+
+glmark2 2012.01 (20120119)
+==========================
+
+* X11:
+  - Run each benchmark in a fresh GL context. Use --reuse-context
+    to revert to the old default behavior of using the same context
+    for all benchmarks.
+  - Add option for showing a live FPS counter on screen (--show-fps).
+  - If the list of benchmarks to run contains only option-setting
+    descriptions, run the default benchmarks.
+* Android:
+  - Fix crash on platforms not supporting glMapBufferOES.
+  - Log the glmark2 score when finishing.
+  - Log an error message if we fail to find a suitable EGLContext.
+  - Implement various stability improvements.
+
+glmark2 2011.12 (20111215)
+==========================
+
+* Add benchmark for bilinear filtering implemented in the fragment
+  shader (not included in the default benchmarks).
+* Ensure we don't call any GL functions before binding a GL context.
+* Fix bug in the ShaderSource object that could lead to shader
+  compilation errors in strict OpenGL ES 2.0 implementations.
+* Refactor scene update code to reduce duplication.
+
+glmark2 2011.11 (20111116)
+==========================
+
+* Add benchmark for bump mapping using a height map.
+* Add benchmark for bump mapping using a tangent space normal map
+  (not included in the default benchmarks).
+* Implement validation support for all default benchmarks.
+* Add a colored prefix to log messages in debug mode.
+* Clean up and refactor code.
+
+glmark2 2011.10 (20111018)
+==========================
+
+* Add benchmark for buffer (VBO) updates.
+* Add benchmark for drop-shadow desktop effect.
+* Add support for glmark2 extra large models.
+* Enable the selection of additional models in the shading benchmark.
+* Gracefully handle unsupported OpenGL versions, on both X11 and Android.
+* Disable screen dimming and screen rotation on Android.
+
+glmark2 2011.09 (20110921)
+==========================
+
+* Add benchmark for blur desktop effect.
+* Add support for multiple lights in the phong shading benchmark.
+* Add support for loading models from OBJ geometry files.
+* Add Stanford Bunny model and make it available in the build benchmark.
+* Add per-scene options to set shader precision at runtime.
+* Add command-line option to specify the benchmarks to run using a text file.
+
+glmark2 2011.08 (20110818)
+==========================
+
+* Port to Android (see INSTALL.android).
+* Add benchmark based on pulsar X11 GL screensaver.
+* Add benchmark for 2D image processing using the GPU.
+* Add command line option to set the size of the output window (-s, --size).
+* Implement ShaderSource object to simplify complex shader creation.
+* Implement utility functions to access resources in an abstract way.
+
+glmark2 2011.07 (20110719)
+==========================
+
+* Replace SDL with custom window handling code.
+* Add benchmark for shader conditionals.
+* Add benchmark for shader function calls.
+* Add benchmark for shader loops.
+* Add benchmark for real phong (vs blinn-phong) lighting model.
+* Add benchmark for normal mapping.
+* Refactor Mesh class to increase flexibility in vertex attribute
+  handling.
+
+glmark2 2011.06 (20110624)
+==========================
+
+* Improve benchmark versatility by allowing runtime-configurable,
+  per-scene options.
+* Add command line option to list avalaible scenes and their
+  supported options (-l,--list-scenes).
+* Allow specifying the scenes to run and their options from the
+  command line (-b,--benchmark).
+* Add basic output validation functionality (--validate).
+* Add command line option to call glFinish() instead of swapping
+  the front and back buffers (--no-swap-buffers).
+* Manually disable VSync for GL/GLX (work around an SDL bug).
+* Replace custom math and shader infrastructure with functionality
+  provided by LibMatrix (lp:libmatrix).
+* Improve user documentation (--help and man page).
+
+glmark2 11.05 (20110530)
+==========================
+
+* Don't use the SDL_OPENGL flag for GLESv2 (LP: #761848).
+* Ensure our screen updates are not synchronized with the vertical
+  retrace (LP: 761855).
+* Use the correct GL headers depending on the flavor (desktop vs ES2).
+* Query the correct GL object for shader linking status.
+
+glmark2 11.01 (20110125)
+==========================
+
+* Fix visual corruption in glmark2-es2 due to missing depth buffer.
+* Fix linking issues with gcc 4.5.
+* Use correct GL functions to manipulate shaders vs programs.
+* Make result reporting more parser-friendly.
+* Upgrade build system to waf 1.6.2.
+
+glmark2 10.07.1 (20100728)
+==========================
+
+* Define the precision of fragment shader variables for OpenGL ES 2.0.
+
+glmark2 10.07 (20100715)
+========================
+
+* First release.
+* Included benchmarks:
+  - Rendering using vertex arrays
+  - Rendering using VBOs
+  - Texturing using nearest filtering
+  - Texturing using linear filtering
+  - Texturing using trilinear mipmapped filtering
+  - Lighting per vertex using simple GLSL shaders
+  - Lighting per pixel using elaborate GLSL shaders
diff --git a/README b/README
new file mode 100644
index 0000000..e9b340a
--- /dev/null
+++ b/README
@@ -0,0 +1,24 @@
+glmark2 is an OpenGL 2.0 and ES 2.0 benchmark.
+
+glmark2 was developed by Alexandros Frantzis based on the original glmark
+benchmark by Ben Smith.
+
+It is licensed under the GPLv3 (see COPYING).
+
+To build glmark2 for X11/GL(ES2) you need:
+
+ * python 2.x (>= 2.4) for the build system (waf)
+ * libpng 1.2
+
+and for OpenGL 2.0:
+
+ * libGL
+
+or for OpenGL ES 2.0:
+
+ * libEGL
+ * libGLESv2
+
+Read the INSTALL file for building/installation instructions,
+
+Read the INSTALL.android file for instructions for Android.
diff --git a/README.android b/README.android
new file mode 100644
index 0000000..7c372f9
--- /dev/null
+++ b/README.android
@@ -0,0 +1,50 @@
+Command-line arguments
+======================
+
+The Android version of glmark2 can accept command-line arguments from either
+an extra intent key or a file. If arguments are specified in an intent key, the
+file is disregarded.
+
+Arguments from an extra intent key
+----------------------------------
+
+The 'args' extra intent key is used to specify arguments. For example:
+
+am start -a android.intent.action.MAIN \
+         -n org.linaro.glmark2/org.linaro.glmark2.Glmark2Activity \
+         -e args '-b :duration=2 -b texture -f /path/file --debug'
+
+Arguments from a file
+---------------------
+
+If the 'args' intent key is not defined, the contents of the file
+'/data/glmark2/args' (if present) are used as command line arguments. The
+arguments can be placed in either a single or multiple lines. For example:
+
+-b :duration -b texture
+-f /path/file
+--debug
+
+Android limitations and peculiarities
+=====================================
+
+The Android version of glmark2 doesn't accept all of the command-line arguments
+that the X11 version accepts. In particular, the Android version currently
+ignores the following:
+
+--validate
+--frame-end
+--off-screen
+--reuse-context
+--fullscreen
+-l,--list-scenes
+
+The default visual config used on Android is:
+
+'red=5:green=6:blue=5:alpha=0:depth=16:buffer=1'
+
+Of course, you can change it using the '--visual-config' option.
+
+The Android system is free to resize the application at will, so although the
+'-s,--size' option is initially taken into account, it usually doesn't have any
+lasting effect.
diff --git a/android/Android.mk b/android/Android.mk
new file mode 100644
index 0000000..644bedd
--- /dev/null
+++ b/android/Android.mk
@@ -0,0 +1,14 @@
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES := $(call all-java-files-under, src)
+
+LOCAL_MODULE_TAGS := optional
+LOCAL_PACKAGE_NAME := GLMark2
+
+LOCAL_JNI_SHARED_LIBRARIES := libglmark2-android
+
+include $(BUILD_PACKAGE)
+
+include $(LOCAL_PATH)/jni/Android.mk
diff --git a/android/AndroidManifest.xml b/android/AndroidManifest.xml
new file mode 100644
index 0000000..71fde82
--- /dev/null
+++ b/android/AndroidManifest.xml
@@ -0,0 +1,54 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+      android:versionCode="1"
+      android:versionName="2012.12" package="org.linaro.glmark2">
+    <application android:label="@string/app_name">
+        <activity android:name="org.linaro.glmark2.MainActivity"
+                  android:label="@string/title_activity_main">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+        <activity
+            android:name="org.linaro.glmark2.EditorActivity"
+            android:label="@string/title_activity_editor" >
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+            </intent-filter>
+        </activity>
+        <activity android:label="@string/title_activity_glmark2"
+                  android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
+                  android:screenOrientation="nosensor"
+                  android:process=":glmark2"
+                  android:name="org.linaro.glmark2.Glmark2Activity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+            </intent-filter>
+        </activity>
+        <activity android:label="@string/title_activity_preferences"
+                  android:name="org.linaro.glmark2.MainPreferencesActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+            </intent-filter>
+        </activity>
+        <activity android:label="@string/title_activity_about"
+                  android:name="org.linaro.glmark2.AboutActivity"
+                  android:theme="@android:style/Theme.Dialog">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+            </intent-filter>
+        </activity>
+        <activity android:label="@string/title_activity_results"
+                  android:name="org.linaro.glmark2.ResultsActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+            </intent-filter>
+        </activity>
+    </application>
+    <uses-permission android:name="android.permission.WAKE_LOCK" />
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+    <uses-feature android:glEsVersion="0x00020000"/>
+    <uses-sdk android:minSdkVersion="9"/>
+</manifest>
diff --git a/android/CleanSpec.mk b/android/CleanSpec.mk
new file mode 100644
index 0000000..c23b5f7
--- /dev/null
+++ b/android/CleanSpec.mk
@@ -0,0 +1,6 @@
+$(call add-clean-step, rm -rf $(OUT_DIR)/target/common/obj/APPS/GLMark2*)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/app/GLMark2.apk)
+
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/SHARED_LIBRARIES/libglmark2-android_intermediates)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/STATIC_LIBRARIES/libglmark2-matrix_intermediates)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/STATIC_LIBRARIES/libglmark2-png_intermediates)
diff --git a/android/assets b/android/assets
new file mode 120000
index 0000000..eed2d0b
--- /dev/null
+++ b/android/assets
@@ -0,0 +1 @@
+../data/
\ No newline at end of file
diff --git a/android/build.xml b/android/build.xml
new file mode 100644
index 0000000..8d11dd3
--- /dev/null
+++ b/android/build.xml
@@ -0,0 +1,92 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project name="Glmark2" default="help">
+
+    <!-- The local.properties file is created and updated by the 'android' tool.
+         It contains the path to the SDK. It should *NOT* be checked into
+         Version Control Systems. -->
+    <property file="local.properties" />
+
+    <!-- The ant.properties file can be created by you. It is only edited by the
+         'android' tool to add properties to it.
+         This is the place to change some Ant specific build properties.
+         Here are some properties you may want to change/update:
+
+         source.dir
+             The name of the source directory. Default is 'src'.
+         out.dir
+             The name of the output directory. Default is 'bin'.
+
+         For other overridable properties, look at the beginning of the rules
+         files in the SDK, at tools/ant/build.xml
+
+         Properties related to the SDK location or the project target should
+         be updated using the 'android' tool with the 'update' action.
+
+         This file is an integral part of the build system for your
+         application and should be checked into Version Control Systems.
+
+         -->
+    <property file="ant.properties" />
+
+    <!-- if sdk.dir was not set from one of the property file, then
+         get it from the ANDROID_HOME env var.
+         This must be done before we load project.properties since
+         the proguard config can use sdk.dir -->
+    <property environment="env" />
+    <condition property="sdk.dir" value="${env.ANDROID_HOME}">
+        <isset property="env.ANDROID_HOME" />
+    </condition>
+
+    <!-- The project.properties file is created and updated by the 'android'
+         tool, as well as ADT.
+
+         This contains project specific properties such as project target, and library
+         dependencies. Lower level build properties are stored in ant.properties
+         (or in .classpath for Eclipse projects).
+
+         This file is an integral part of the build system for your
+         application and should be checked into Version Control Systems. -->
+    <loadproperties srcFile="project.properties" />
+
+    <!-- quick check on sdk.dir -->
+    <fail
+            message="sdk.dir is missing. Make sure to generate local.properties using 'android update project' or to inject it through the ANDROID_HOME environment variable."
+            unless="sdk.dir"
+    />
+
+    <!--
+        Import per project custom build rules if present at the root of the project.
+        This is the place to put custom intermediary targets such as:
+            -pre-build
+            -pre-compile
+            -post-compile (This is typically used for code obfuscation.
+                           Compiled code location: ${out.classes.absolute.dir}
+                           If this is not done in place, override ${out.dex.input.absolute.dir})
+            -post-package
+            -post-build
+            -pre-clean
+    -->
+    <import file="custom_rules.xml" optional="true" />
+
+    <!-- Import the actual build file.
+
+         To customize existing targets, there are two options:
+         - Customize only one target:
+             - copy/paste the target into this file, *before* the
+               <import> task.
+             - customize it to your needs.
+         - Customize the whole content of build.xml
+             - copy/paste the content of the rules files (minus the top node)
+               into this file, replacing the <import> task.
+             - customize to your needs.
+
+         ***********************
+         ****** IMPORTANT ******
+         ***********************
+         In all cases you must update the value of version-tag below to read 'custom' instead of an integer,
+         in order to avoid having your file be overridden by tools such as "android update project"
+    -->
+    <!-- version-tag: 1 -->
+    <import file="${sdk.dir}/tools/ant/build.xml" />
+
+</project>
diff --git a/android/jni/Android.mk b/android/jni/Android.mk
new file mode 100644
index 0000000..6887d78
--- /dev/null
+++ b/android/jni/Android.mk
@@ -0,0 +1,76 @@
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_CPP_EXTENSION := .cc
+LOCAL_MODULE := libglmark2-matrix
+LOCAL_CFLAGS := -DUSE_GLESv2 -Werror -Wall -Wextra -Wnon-virtual-dtor \
+                -Wno-error=unused-parameter
+LOCAL_C_INCLUDES := $(LOCAL_PATH)/src
+LOCAL_SRC_FILES := $(subst $(LOCAL_PATH)/,,$(wildcard $(LOCAL_PATH)/src/libmatrix/*.cc))
+LOCAL_SHARED_LIBRARIES := libdl libstlport
+
+include external/stlport/libstlport.mk
+
+include $(BUILD_STATIC_LIBRARY)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := libglmark2-png
+LOCAL_SRC_FILES := $(subst $(LOCAL_PATH)/,,$(wildcard $(LOCAL_PATH)/src/libpng/*.c))
+LOCAL_C_INCLUDES := external/zlib
+
+include $(BUILD_STATIC_LIBRARY)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := libglmark2-jpeg
+LOCAL_CFLAGS := -Werror -Wall -Wextra -Wno-error=attributes \
+                -Wno-error=unused-parameter -Wno-error=unused-function -Wno-error=unused-variable
+LOCAL_C_INCLUDES := $(LOCAL_PATH)/src/libjpeg-turbo/
+LOCAL_SRC_FILES := $(subst $(LOCAL_PATH)/,,$(wildcard $(LOCAL_PATH)/src/libjpeg-turbo/simd/*.c)) \
+                   $(subst $(LOCAL_PATH)/,,$(wildcard $(LOCAL_PATH)/src/libjpeg-turbo/simd/*.S)) \
+                   $(subst $(LOCAL_PATH)/,,$(wildcard $(LOCAL_PATH)/src/libjpeg-turbo/*.c))
+
+include $(BUILD_STATIC_LIBRARY)
+
+include $(CLEAR_VARS)
+
+LOCAL_CPP_EXTENSION := .cc
+LOCAL_MODULE := libglmark2-ideas
+LOCAL_CFLAGS := -DGLMARK_DATA_PATH="" -DUSE_GLESv2 -Werror -Wall -Wextra\
+                -Wnon-virtual-dtor -Wno-error=unused-parameter
+LOCAL_C_INCLUDES := $(LOCAL_PATH)/src \
+                    $(LOCAL_PATH)/src/libmatrix
+LOCAL_SRC_FILES := $(subst $(LOCAL_PATH)/,,$(wildcard $(LOCAL_PATH)/src/scene-ideas/*.cc))
+LOCAL_SHARED_LIBRARIES := libdl libstlport
+
+include external/stlport/libstlport.mk
+
+include $(BUILD_STATIC_LIBRARY)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE_TAGS := optional
+LOCAL_MODULE := libglmark2-android
+LOCAL_STATIC_LIBRARIES := libglmark2-matrix libglmark2-png libglmark2-ideas libglmark2-jpeg
+LOCAL_CFLAGS := -DGLMARK_DATA_PATH="" -DGLMARK_VERSION="\"2012.12\"" \
+                -DUSE_GLESv2 -Werror -Wall -Wextra -Wnon-virtual-dtor \
+                -Wno-error=unused-parameter
+LOCAL_SHARED_LIBRARIES := liblog libz libEGL libGLESv2 libandroid libdl libstlport
+LOCAL_C_INCLUDES := $(LOCAL_PATH)/src \
+                    $(LOCAL_PATH)/src/libmatrix \
+                    $(LOCAL_PATH)/src/scene-ideas \
+                    $(LOCAL_PATH)/src/scene-terrain \
+                    $(LOCAL_PATH)/src/libjpeg-turbo \
+                    $(LOCAL_PATH)/src/libpng \
+                    external/zlib
+LOCAL_SRC_FILES := $(filter-out src/canvas% src/main.cpp, \
+                     $(subst $(LOCAL_PATH)/,,$(wildcard $(LOCAL_PATH)/src/*.cpp))) \
+                   $(subst $(LOCAL_PATH)/,,$(wildcard $(LOCAL_PATH)/src/scene-terrain/*.cpp)) \
+                   src/canvas-android.cpp
+LOCAL_PRELINK_MODULE := false
+
+include external/stlport/libstlport.mk
+
+include $(BUILD_SHARED_LIBRARY)
diff --git a/android/jni/Android.ndk.mk b/android/jni/Android.ndk.mk
new file mode 100644
index 0000000..0279799
--- /dev/null
+++ b/android/jni/Android.ndk.mk
@@ -0,0 +1,65 @@
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_CPP_EXTENSION := .cc
+LOCAL_MODULE := libglmark2-matrix
+LOCAL_CFLAGS := -DUSE_GLESv2 -Werror -Wall -Wextra -Wnon-virtual-dtor \
+                -Wno-error=unused-parameter
+LOCAL_C_INCLUDES := $(LOCAL_PATH)/src
+LOCAL_SRC_FILES := $(subst $(LOCAL_PATH)/,,$(wildcard $(LOCAL_PATH)/src/libmatrix/*.cc))
+
+include $(BUILD_STATIC_LIBRARY)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := libglmark2-png
+LOCAL_SRC_FILES := $(subst $(LOCAL_PATH)/,,$(wildcard $(LOCAL_PATH)/src/libpng/*.c))
+
+include $(BUILD_STATIC_LIBRARY)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := libglmark2-jpeg
+LOCAL_CFLAGS := -Werror -Wall -Wextra -Wno-error=attributes \
+                -Wno-error=unused-parameter -Wno-error=unused-function -Wno-error=unused-variable
+LOCAL_C_INCLUDES := $(LOCAL_PATH)/src/libjpeg-turbo/
+LOCAL_SRC_FILES := $(subst $(LOCAL_PATH)/,,$(wildcard $(LOCAL_PATH)/src/libjpeg-turbo/simd/*.c)) \
+                   $(subst $(LOCAL_PATH)/,,$(wildcard $(LOCAL_PATH)/src/libjpeg-turbo/simd/*.S)) \
+                   $(subst $(LOCAL_PATH)/,,$(wildcard $(LOCAL_PATH)/src/libjpeg-turbo/*.c))
+
+include $(BUILD_STATIC_LIBRARY)
+
+include $(CLEAR_VARS)
+
+LOCAL_CPP_EXTENSION := .cc
+LOCAL_MODULE := libglmark2-ideas
+LOCAL_CFLAGS := -DGLMARK_DATA_PATH="" -DUSE_GLESv2 -Werror -Wall -Wextra\
+                -Wnon-virtual-dtor -Wno-error=unused-parameter
+LOCAL_C_INCLUDES := $(LOCAL_PATH)/src \
+                    $(LOCAL_PATH)/src/libmatrix
+LOCAL_SRC_FILES := $(subst $(LOCAL_PATH)/,,$(wildcard $(LOCAL_PATH)/src/scene-ideas/*.cc))
+
+include $(BUILD_STATIC_LIBRARY)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE_TAGS := optional
+LOCAL_MODULE := libglmark2-android
+LOCAL_STATIC_LIBRARIES := libglmark2-matrix libglmark2-png libglmark2-ideas libglmark2-jpeg
+LOCAL_CFLAGS := -DGLMARK_DATA_PATH="" -DGLMARK_VERSION="\"2012.12\"" \
+                -DUSE_GLESv2 -Werror -Wall -Wextra -Wnon-virtual-dtor \
+                -Wno-error=unused-parameter
+LOCAL_LDLIBS := -landroid -llog -lGLESv2 -lEGL -lz
+LOCAL_C_INCLUDES := $(LOCAL_PATH)/src \
+                    $(LOCAL_PATH)/src/libmatrix \
+                    $(LOCAL_PATH)/src/scene-ideas \
+                    $(LOCAL_PATH)/src/scene-terrain \
+                    $(LOCAL_PATH)/src/libjpeg-turbo \
+                    $(LOCAL_PATH)/src/libpng
+LOCAL_SRC_FILES := $(filter-out src/canvas% src/main.cpp, \
+                     $(subst $(LOCAL_PATH)/,,$(wildcard $(LOCAL_PATH)/src/*.cpp))) \
+                   $(subst $(LOCAL_PATH)/,,$(wildcard $(LOCAL_PATH)/src/scene-terrain/*.cpp)) \
+                   src/canvas-android.cpp
+
+include $(BUILD_SHARED_LIBRARY)
diff --git a/android/jni/Application.mk b/android/jni/Application.mk
new file mode 100644
index 0000000..69d78d9
--- /dev/null
+++ b/android/jni/Application.mk
@@ -0,0 +1,3 @@
+APP_STL := stlport_static
+APP_PLATFORM := android-9
+APP_BUILD_SCRIPT := jni/Android.ndk.mk
diff --git a/android/jni/src b/android/jni/src
new file mode 120000
index 0000000..a8d2a67
--- /dev/null
+++ b/android/jni/src
@@ -0,0 +1 @@
+../../src/
\ No newline at end of file
diff --git a/android/project.properties b/android/project.properties
new file mode 100644
index 0000000..b7c2081
--- /dev/null
+++ b/android/project.properties
@@ -0,0 +1,14 @@
+# This file is automatically generated by Android Tools.
+# Do not modify this file -- YOUR CHANGES WILL BE ERASED!
+#
+# This file must be checked in Version Control Systems.
+#
+# To customize properties used by the Ant build system edit
+# "ant.properties", and override values to adapt the script to your
+# project structure.
+#
+# To enable ProGuard to shrink and obfuscate your code, uncomment this (available properties: sdk.dir, user.home):
+#proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt
+
+# Project target.
+target=android-10
diff --git a/android/res/drawable/menu_about.png b/android/res/drawable/menu_about.png
new file mode 100644
index 0000000..6a7a1e9
--- /dev/null
+++ b/android/res/drawable/menu_about.png
diff --git a/android/res/drawable/menu_delete.png b/android/res/drawable/menu_delete.png
new file mode 100644
index 0000000..24d8f6a
--- /dev/null
+++ b/android/res/drawable/menu_delete.png
diff --git a/android/res/drawable/menu_load.png b/android/res/drawable/menu_load.png
new file mode 100644
index 0000000..e2d9bc1
--- /dev/null
+++ b/android/res/drawable/menu_load.png
diff --git a/android/res/drawable/menu_results.png b/android/res/drawable/menu_results.png
new file mode 100644
index 0000000..95a3217
--- /dev/null
+++ b/android/res/drawable/menu_results.png
diff --git a/android/res/drawable/menu_save.png b/android/res/drawable/menu_save.png
new file mode 100644
index 0000000..36fc7f4
--- /dev/null
+++ b/android/res/drawable/menu_save.png
diff --git a/android/res/drawable/menu_settings.png b/android/res/drawable/menu_settings.png
new file mode 100644
index 0000000..5321f82
--- /dev/null
+++ b/android/res/drawable/menu_settings.png
diff --git a/android/res/layout/activity_about.xml b/android/res/layout/activity_about.xml
new file mode 100644
index 0000000..6402727
--- /dev/null
+++ b/android/res/layout/activity_about.xml
@@ -0,0 +1,43 @@
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+              android:layout_width="match_parent"
+              android:layout_height="match_parent"
+              android:orientation="vertical"
+              android:padding="10dp">
+
+    <TextView android:id="@+id/name_version"
+              android:layout_width="match_parent"
+              android:layout_height="wrap_content"
+              android:gravity="center_horizontal"
+              android:text="@string/about_name_version_format" />
+
+    <TextView android:id="@+id/description"
+              android:layout_width="match_parent"
+              android:layout_height="wrap_content"
+              android:gravity="center_horizontal"
+              android:text="@string/about_description" />
+
+    <TextView android:id="@+id/copyright"
+              android:layout_width="match_parent"
+              android:layout_height="wrap_content"
+              android:gravity="center_horizontal"
+              android:text="@string/about_copyright" />
+
+    <TextView android:id="@+id/url"
+              android:layout_width="match_parent"
+              android:layout_height="wrap_content"
+              android:gravity="center_horizontal"
+              android:text="@string/about_url" />
+
+    <TextView android:id="@+id/license1"
+              android:layout_width="match_parent"
+              android:layout_height="wrap_content"
+              android:gravity="center_horizontal"
+              android:text="@string/about_license_1" />
+
+    <TextView android:id="@+id/license2"
+              android:layout_width="match_parent"
+              android:layout_height="wrap_content"
+              android:gravity="center_horizontal"
+              android:text="@string/about_license_2" />
+</LinearLayout>
+
diff --git a/android/res/layout/activity_editor.xml b/android/res/layout/activity_editor.xml
new file mode 100644
index 0000000..c59f7c2
--- /dev/null
+++ b/android/res/layout/activity_editor.xml
@@ -0,0 +1,34 @@
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+                xmlns:tools="http://schemas.android.com/tools"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent" >
+
+    <LinearLayout android:id="@+id/buttonLinearLayout" 
+                  android:layout_width="match_parent" 
+                  android:layout_height="wrap_content" 
+                  android:layout_alignParentBottom="true">
+
+        <Button android:id="@+id/runButton"
+                android:layout_width="0dip"
+                android:layout_height="wrap_content"
+                android:layout_weight="1.0"
+                android:layout_alignParentBottom="true"
+                android:text="@string/runButtonText" />
+
+        <Button android:id="@+id/saveButton"
+                android:layout_width="0dip"
+                android:layout_height="wrap_content"
+                android:layout_weight="1.0"
+                android:layout_alignParentBottom="true"
+                android:text="@string/saveButtonText" />
+
+    </LinearLayout>
+
+
+    <ListView android:id="@+id/editorListView"
+              android:layout_above="@id/buttonLinearLayout"
+              android:layout_weight="1.0"
+              android:layout_width="match_parent"
+              android:layout_height="match_parent"
+              android:layout_alignParentTop="true" />
+</RelativeLayout>
diff --git a/android/res/layout/activity_main.xml b/android/res/layout/activity_main.xml
new file mode 100644
index 0000000..c9342be
--- /dev/null
+++ b/android/res/layout/activity_main.xml
@@ -0,0 +1,20 @@
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+                xmlns:tools="http://schemas.android.com/tools"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent" >
+
+    <Button android:id="@+id/runButton"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_alignParentBottom="true"
+            android:text="@string/runButtonText" />
+
+    <ListView android:id="@+id/benchmarkListView"
+              android:layout_above="@id/runButton"
+              android:layout_weight="1.0"
+              android:layout_width="match_parent"
+              android:layout_height="match_parent"
+              android:layout_alignParentTop="true" />
+
+
+</RelativeLayout>
diff --git a/android/res/layout/activity_results.xml b/android/res/layout/activity_results.xml
new file mode 100644
index 0000000..46c8f66
--- /dev/null
+++ b/android/res/layout/activity_results.xml
@@ -0,0 +1,15 @@
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content">
+
+    <HorizontalScrollView android:layout_width="match_parent"
+                          android:layout_height="wrap_content">
+
+        <TextView android:id="@+id/results"
+                  android:layout_width="match_parent"
+                  android:layout_height="wrap_content"
+                  android:typeface="monospace" />
+
+    </HorizontalScrollView>
+
+</ScrollView>
diff --git a/android/res/layout/list_header.xml b/android/res/layout/list_header.xml
new file mode 100644
index 0000000..9c5bd8f
--- /dev/null
+++ b/android/res/layout/list_header.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<TextView xmlns:android="http://schemas.android.com/apk/res/android"
+          style="?android:attr/listSeparatorTextViewStyle"
+          android:id="@+id/listHeader" />
diff --git a/android/res/layout/list_item.xml b/android/res/layout/list_item.xml
new file mode 100644
index 0000000..7b3233d
--- /dev/null
+++ b/android/res/layout/list_item.xml
@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:minHeight="?android:attr/listPreferredItemHeight"
+                android:gravity="center_vertical"
+                android:paddingRight="?android:attr/scrollbarSize" >
+
+    <RelativeLayout android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_marginLeft="15dip"
+                    android:layout_marginRight="6dip"
+                    android:layout_marginTop="6dip"
+                    android:layout_marginBottom="6dip"
+                    android:layout_weight="1">
+
+        <TextView android:id="@+id/title"
+                  android:layout_width="wrap_content"
+                  android:layout_height="wrap_content"
+                  android:textAppearance="?android:attr/textAppearanceLarge" />
+
+        <TextView android:id="@+id/summary"
+                  android:layout_width="wrap_content"
+                  android:layout_height="wrap_content"
+                  android:layout_alignLeft="@id/title"
+                  android:layout_below="@id/title"
+                  android:textAppearance="?android:attr/textAppearanceSmall"
+                  android:textColor="?android:attr/textColorSecondary" />
+
+    </RelativeLayout>
+
+</LinearLayout>
diff --git a/android/res/layout/save_dialog.xml b/android/res/layout/save_dialog.xml
new file mode 100644
index 0000000..1074b52
--- /dev/null
+++ b/android/res/layout/save_dialog.xml
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:gravity="center_vertical" >
+
+    <RelativeLayout android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_marginLeft="15dip"
+                    android:layout_marginRight="15dip"
+                    android:layout_marginTop="6dip"
+                    android:layout_marginBottom="6dip"
+                    android:layout_weight="1">
+
+        <EditText android:id="@+id/listName"
+                  android:layout_width="match_parent"
+                  android:layout_height="wrap_content" />
+
+        <CheckBox android:id="@+id/external"
+                  android:layout_width="wrap_content"
+                  android:layout_height="wrap_content"
+                  android:layout_alignLeft="@id/listName"
+                  android:layout_below="@id/listName"
+                  android:text="@string/externalSaveDialogText"/>
+
+    </RelativeLayout>
+
+</LinearLayout>
diff --git a/android/res/menu/main_options_menu.xml b/android/res/menu/main_options_menu.xml
new file mode 100644
index 0000000..e833173
--- /dev/null
+++ b/android/res/menu/main_options_menu.xml
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:id="@+id/save_benchmark_list"
+          android:title="@string/saveMainOptionsText"
+          android:icon="@drawable/menu_save" />
+
+    <item android:id="@+id/load_benchmark_list"
+          android:title="@string/loadMainOptionsText"
+          android:icon="@drawable/menu_load" />
+
+    <item android:id="@+id/delete_benchmark_list"
+          android:title="@string/deleteMainOptionsText"
+          android:icon="@drawable/menu_delete" />
+
+    <item android:id="@+id/settings"
+          android:title="@string/settingsMainOptionsText"
+          android:icon="@drawable/menu_settings" />
+
+    <item android:id="@+id/results"
+          android:title="@string/resultsMainOptionsText"
+          android:icon="@drawable/menu_results" />
+
+    <item android:id="@+id/about"
+          android:title="@string/aboutMainOptionsText"
+          android:icon="@drawable/menu_about" />
+</menu>
diff --git a/android/res/values/strings.xml b/android/res/values/strings.xml
new file mode 100644
index 0000000..571541c
--- /dev/null
+++ b/android/res/values/strings.xml
@@ -0,0 +1,46 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">GLMark2</string>
+    <string name="title_activity_main">GLMark2</string>
+    <string name="title_activity_editor">GLMark2 Benchmark Editor</string>
+    <string name="title_activity_preferences">GLMark2 Settings</string>
+    <string name="title_activity_about">About GLMark2</string>
+    <string name="title_activity_results">GLMark2 Results</string>
+    <string name="title_activity_glmark2">GLMark2</string>
+    <string name="runButtonText">Run</string>
+    <string name="saveButtonText">Save</string>
+
+    <string name="saveMainOptionsText">Save list</string>
+    <string name="loadMainOptionsText">Load list</string>
+    <string name="deleteMainOptionsText">Delete list</string>
+    <string name="settingsMainOptionsText">Settings</string>
+    <string name="resultsMainOptionsText">Last results</string>
+    <string name="aboutMainOptionsText">About</string>
+
+    <string name="externalSaveDialogText">Save to external storage</string>
+
+    <string name="runForeverPreferenceTitle">Run forever</string>
+    <string name="runForeverPreferenceSummary">Run indefinitely, looping from the last benchmark back to the first</string>
+    <string name="logDebugPreferenceTitle">Log debug messages</string>
+    <string name="logDebugPreferenceSummary">Display debug messages in the log</string>
+    <string name="showResultsPreferenceTitle">Show benchmark results</string>
+    <string name="showResultsPreferenceSummary">Show results after running benchmarks</string>
+
+    <string name="about_name_version_format">GLMark2 %1$s</string>
+    <string name="about_description">OpenGL (ES) 2.0 benchmark suite</string>
+    <string name="about_copyright">Copyright © 2010-2012 Linaro Limited</string>
+    <string name="about_url">http://launchpad.net/glmark2</string>
+    <string name="about_license_1">
+        glmark2 is free software: you can redistribute it and/or modify it
+        under the terms of the GNU General Public License as published by the
+        Free Software Foundation, either version 3 of the License, or (at your
+        option) any later version
+    </string>
+    <string name="about_license_2">
+        glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+        WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+        FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+        details.
+    </string>
+
+</resources>
diff --git a/android/res/xml/preferences.xml b/android/res/xml/preferences.xml
new file mode 100644
index 0000000..be88f2a
--- /dev/null
+++ b/android/res/xml/preferences.xml
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
+    <CheckBoxPreference android:key="run_forever"
+                        android:title="@string/runForeverPreferenceTitle"
+                        android:summary="@string/runForeverPreferenceSummary"
+                        android:defaultValue="false" />
+    <CheckBoxPreference android:key="log_debug"
+                        android:title="@string/logDebugPreferenceTitle"
+                        android:summary="@string/logDebugPreferenceSummary"
+                        android:defaultValue="false" />
+    <CheckBoxPreference android:key="show_results"
+                        android:title="@string/showResultsPreferenceTitle"
+                        android:summary="@string/showResultsPreferenceSummary"
+                        android:defaultValue="true" />
+</PreferenceScreen>
diff --git a/android/src/org/linaro/glmark2/AboutActivity.java b/android/src/org/linaro/glmark2/AboutActivity.java
new file mode 100644
index 0000000..0c88cdb
--- /dev/null
+++ b/android/src/org/linaro/glmark2/AboutActivity.java
@@ -0,0 +1,52 @@
+/*
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis
+ */
+package org.linaro.glmark2;
+
+import android.app.Activity;
+import android.content.pm.PackageInfo;
+import android.os.Bundle;
+import android.view.Window;
+import android.widget.TextView;
+
+public class AboutActivity extends Activity {
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        requestWindowFeature(Window.FEATURE_NO_TITLE);
+        setContentView(R.layout.activity_about);
+
+        /* Get the application version */
+        String versionName = "?";
+
+        try {
+            PackageInfo info = getPackageManager().getPackageInfo(getPackageName(), 0);
+            versionName = info.versionName;
+        }
+        catch (Exception e) {
+        }
+
+        /* Display the application version */
+        TextView tv = (TextView) findViewById(R.id.name_version);
+        String formatString = getString(R.string.about_name_version_format);
+        tv.setText(String.format(formatString, versionName));
+    }
+}
diff --git a/android/src/org/linaro/glmark2/BenchmarkListManager.java b/android/src/org/linaro/glmark2/BenchmarkListManager.java
new file mode 100644
index 0000000..3757307
--- /dev/null
+++ b/android/src/org/linaro/glmark2/BenchmarkListManager.java
@@ -0,0 +1,189 @@
+/*
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis
+ */
+package org.linaro.glmark2;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.io.*;
+
+import android.app.Activity;
+import android.os.Environment;
+
+class BenchmarkListManager {
+
+    private ArrayList<String> benchmarks;
+    private Activity activity;
+
+    BenchmarkListManager(Activity activity, ArrayList<String> benchmarks)
+    {
+        this.activity = activity;
+        if (benchmarks == null) {
+            this.benchmarks = new ArrayList<String>();
+            this.benchmarks.add("Add benchmark...");
+        }
+        else {
+            this.benchmarks = benchmarks;
+        }
+    }
+
+    /** 
+     * Gets the list holding the benchmarks.
+     *
+     * The reference to this list is constant for the life of
+     * the BenchmarkListManager,
+     * 
+     * @return the operation error code
+     */
+    ArrayList<String> getBenchmarkList() {
+        return benchmarks;
+    }
+
+    /** 
+     * Gets the saved benchmark lists.
+     * 
+     * Each list name is prefixed with either "internal/" or "external/"
+     * to denote in which storage area it is saved in.
+     * 
+     * @return an array containing the saved list names
+     */
+     String[] getSavedLists() {
+        File externalPath = getSavedListPath(true);
+        File internalPath = getSavedListPath(false);
+        ArrayList<String> lists = new ArrayList<String>();
+
+        if (externalPath != null && externalPath.isDirectory()) {
+            for (File f: externalPath.listFiles())
+                lists.add("external/" + f.getName());
+        }
+
+        if (internalPath != null && internalPath.isDirectory()) {
+            for (File f: internalPath.listFiles())
+                lists.add("internal/" + f.getName());
+        }
+
+        Collections.sort(lists);
+
+        String[] a = new String[0];
+        return lists.toArray(a);
+    }
+
+    /** 
+     * Saves the current benchmark list to a file.
+     * 
+     * @param listName the list filename
+     * @param external whether the file is to be stored in external storage
+     */
+    void saveBenchmarkList(String listName, boolean external) throws Exception {
+        File listPath = getSavedListPath(external);
+        if (listPath == null)
+            throw new Exception("External storage not present");
+
+        listPath.mkdirs();
+
+        File f = new File(listPath, listName);
+
+        BufferedWriter out = new BufferedWriter(new FileWriter(f));
+        try {
+            for (int i = 0; i < benchmarks.size() - 1; i++) {
+                out.write(benchmarks.get(i));
+                out.newLine();
+            }
+        }
+        catch (Exception ex) {
+            throw ex;
+        }
+        finally {
+            out.close();
+        }
+    }
+
+    /** 
+     * Loads a benchmark list from a file.
+     * 
+     * @param listName the list filename
+     * @param external whether the file is stored in external storage
+     */
+    void loadBenchmarkList(String listName, boolean external) throws Exception {
+        /* Get the list file path */
+        File listPath = getSavedListPath(external);
+        if (listPath == null)
+            throw new Exception("External storage not present");
+
+        File f = new File(listPath, listName);
+
+        ArrayList<String> newBenchmarks = new ArrayList<String>();
+
+        /* Read benchmarks from file */
+        BufferedReader reader = new BufferedReader(new FileReader(f));
+        String line = null;
+
+        while ((line = reader.readLine()) != null)
+            newBenchmarks.add(line);
+
+        /* If everything went well, replace current benchmarks */
+        benchmarks.clear();
+        benchmarks.addAll(newBenchmarks);
+        benchmarks.add("Add benchmark...");
+    }
+
+    /** 
+     * Delete a benchmark list file.
+     * 
+     * @param listName the list filename
+     * @param external whether the file is stored in external storage
+     */
+    void deleteBenchmarkList(String listName, boolean external) throws Exception {
+        /* Get the list file path */
+        File listPath = getSavedListPath(external);
+        if (listPath == null)
+            throw new Exception("External storage not present");
+
+        File f = new File(listPath, listName);
+        f.delete();
+    }
+
+    /** 
+     * Gets the path where benchmark lists are saved in.
+     * 
+     * @param external whether to get the path for external storage
+     * 
+     * @return the saved list path
+     */
+    private File getSavedListPath(boolean external) {
+        File f = null;
+
+        if (external) {
+            String state = Environment.getExternalStorageState();
+            if (!Environment.MEDIA_MOUNTED.equals(state))
+                return null;
+            f = activity.getExternalFilesDir(null);
+        }
+        else {
+            f = activity.getFilesDir();
+        }
+
+        if (f != null)
+            f = new File(f, "lists");
+
+        return f;
+    }
+}
diff --git a/android/src/org/linaro/glmark2/EditorActivity.java b/android/src/org/linaro/glmark2/EditorActivity.java
new file mode 100644
index 0000000..47e88c8
--- /dev/null
+++ b/android/src/org/linaro/glmark2/EditorActivity.java
@@ -0,0 +1,548 @@
+/*
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis
+ */
+package org.linaro.glmark2;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+
+import android.app.Activity;
+import android.app.AlertDialog;
+import android.app.Dialog;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.DialogInterface.OnDismissListener;
+import android.content.Intent;
+import android.graphics.Color;
+import android.os.Bundle;
+import android.os.Parcelable;
+import android.text.SpannableString;
+import android.text.style.ForegroundColorSpan;
+import android.util.Log;
+import android.view.inputmethod.EditorInfo;
+import android.view.KeyEvent;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.WindowManager;
+import android.widget.AdapterView;
+import android.widget.AdapterView.OnItemClickListener;
+import android.widget.AdapterView.OnItemLongClickListener;
+import android.widget.ArrayAdapter;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.ListView;
+import android.widget.TextView;
+import android.widget.TextView.OnEditorActionListener;
+
+public class EditorActivity extends Activity {
+    public static final int DIALOG_SCENE_NAME_ID = 0;
+    public static final int DIALOG_SCENE_OPTION_TEXT_ID = 1;
+    public static final int DIALOG_SCENE_OPTION_LIST_ID = 2;
+
+    public static final int ITEM_POSITION_SCENE_NAME_HEADER = 0;
+    public static final int ITEM_POSITION_SCENE_NAME = 1;
+    public static final int ITEM_POSITION_SCENE_OPTION_HEADER = 2;
+    public static final int ITEM_POSITION_SCENE_OPTION = 3;
+
+    private EditorItemAdapter adapter;
+    private ArrayList<SceneInfo> sceneInfoList;
+    private String[] sceneNames;
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_editor);
+
+        /* Get information about the available scenes */
+        sceneInfoList = getSceneInfoList();
+        sceneNames = getSceneNames();
+
+        /* Read information sent by the main activity */
+        final int benchmarkPos = this.getIntent().getIntExtra("benchmark-pos", 0);
+        String benchmarkText = getIntent().getStringExtra("benchmark-text");
+        if (benchmarkText.isEmpty())
+            benchmarkText = sceneNames[0];
+
+        /* Set up the run button */
+        Button runButton = (Button) findViewById(R.id.runButton);
+        runButton.setOnClickListener(new View.OnClickListener() {
+            public void onClick(View v) {
+                Intent intent = new Intent(EditorActivity.this, Glmark2Activity.class);
+                String args = "-b \"" + getBenchmarkDescriptionText() + "\"";
+                intent.putExtra("args", args);
+                startActivity(intent);
+            }
+        });
+
+        /* Set up the save button */
+        Button button = (Button) findViewById(R.id.saveButton);
+        button.setOnClickListener(new View.OnClickListener() {
+            public void onClick(View v) {
+                String newBenchmarkText = getBenchmarkDescriptionText();
+                Intent intent = new Intent();
+                intent.putExtra("benchmark-text", newBenchmarkText);
+                intent.putExtra("benchmark-pos", benchmarkPos);
+                setResult(RESULT_OK, intent);
+                finish();
+            }
+        });
+
+        /* Set up list view */
+        ListView lv = (ListView) findViewById(R.id.editorListView);
+        adapter = new EditorItemAdapter(this, R.layout.list_item,
+                                        getEditorItemList(benchmarkText));
+        lv.setAdapter(adapter);
+
+        lv.setOnItemClickListener(new OnItemClickListener() {
+            public void onItemClick(AdapterView<?> parentView, View childView, int position, long id) {
+                Bundle bundle = new Bundle();
+                bundle.putInt("item-pos", position);
+                /* Show the right dialog, depending on the clicked list position */
+                if (position == ITEM_POSITION_SCENE_NAME) {
+                    showDialog(DIALOG_SCENE_NAME_ID, bundle);
+                }
+                else if (position >= ITEM_POSITION_SCENE_OPTION) {
+                    String[] values = adapter.getItem(position).option.acceptableValues;
+                    if (values.length == 0)
+                        showDialog(DIALOG_SCENE_OPTION_TEXT_ID, bundle);
+                    else
+                        showDialog(DIALOG_SCENE_OPTION_LIST_ID, bundle);
+                }
+            }
+        });
+
+        lv.setOnItemLongClickListener(new OnItemLongClickListener() {
+            public boolean onItemLongClick(AdapterView<?> parentView, View childView, int position, long id) {
+                /* Reset the value of the long-clicked option */
+                if (position >= ITEM_POSITION_SCENE_OPTION) {
+                    EditorItem item = adapter.getItem(position);
+                    item.value = null;
+                    adapter.notifyDataSetChanged();
+                }
+                return true;
+            }
+        });
+    }
+
+    @Override
+    protected Dialog onCreateDialog(int id, Bundle bundle) {
+        final int itemPos = bundle.getInt("item-pos");
+        Dialog dialog;
+        final int finalId = id;
+
+        switch (id) {
+            case DIALOG_SCENE_NAME_ID:
+                {
+                AlertDialog.Builder builder = new AlertDialog.Builder(this);
+                builder.setTitle("Pick a scene");
+                builder.setItems(sceneNames, new DialogInterface.OnClickListener() {
+                    public void onClick(DialogInterface dialog, int item) {
+                        adapter.clear();
+                        for (EditorItem ei: getEditorItemList(sceneNames[item]))
+                            adapter.add(ei);
+                        adapter.notifyDataSetChanged();
+                        dismissDialog(DIALOG_SCENE_NAME_ID);
+                    }
+                });
+                dialog = builder.create();
+                }
+                break;
+
+            case DIALOG_SCENE_OPTION_TEXT_ID:
+                {
+                AlertDialog.Builder builder = new AlertDialog.Builder(this);
+                final EditorItem item = adapter.getItem(itemPos);
+                final EditText input = new EditText(this);
+                if (item.value != null)
+                    input.setText(item.value);
+
+                input.setOnEditorActionListener(new OnEditorActionListener() {
+                    public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
+                        if (actionId == EditorInfo.IME_ACTION_DONE ||
+                            (event != null && event.getKeyCode() == KeyEvent.KEYCODE_ENTER &&
+                             event.getAction() == KeyEvent.ACTION_UP))
+                        {
+                            item.value = v.getText().toString();
+                            adapter.notifyDataSetChanged();
+                            dismissDialog(DIALOG_SCENE_OPTION_TEXT_ID);
+                        }
+                        return true;
+                    }
+                });
+                builder.setTitle(item.option.name + ": " + item.option.description);
+                dialog = builder.create();
+                ((AlertDialog)dialog).setView(input, 15, 6, 15, 6);
+                dialog.getWindow().setSoftInputMode(
+                        WindowManager.LayoutParams.SOFT_INPUT_ADJUST_PAN |
+                        WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE
+                        );
+
+                }
+                break;
+
+            case DIALOG_SCENE_OPTION_LIST_ID:
+                {
+                AlertDialog.Builder builder = new AlertDialog.Builder(this);
+                final EditorItem item = adapter.getItem(itemPos);
+                builder.setTitle(item.option.name + ": " + item.option.description);
+
+                builder.setItems(item.option.acceptableValues, new DialogInterface.OnClickListener() {
+                    public void onClick(DialogInterface dialog, int index) {
+                        item.value = item.option.acceptableValues[index];
+                        adapter.notifyDataSetChanged();
+                        dismissDialog(DIALOG_SCENE_OPTION_LIST_ID);
+                    }
+                });
+
+                dialog = builder.create();
+                }
+                break;
+
+            default:
+                dialog = null;
+                break;
+        }
+
+        if (dialog != null) {
+            dialog.setOnDismissListener(new OnDismissListener() {
+                public void onDismiss(DialogInterface dialog) {
+                    removeDialog(finalId);
+                }
+            });
+        }
+
+        return dialog;
+    }
+
+    /**
+     * Gets the value of an option.
+     *
+     * @param benchArray an array of option strings ("opt=val")
+     * @param opt the options to get the value of
+     *
+     * @return the value or null
+     */
+    private String getOptionValue(String[] benchArray, String opt) {
+        String ret = null;
+
+        /* Search from the end to the beginning */
+        for (int n = benchArray.length - 1; n >= 0; n--) {
+            String s = benchArray[n].trim();
+            if (s.startsWith(opt + "=")) {
+                int i = s.indexOf('=');
+                if (i >= 0 && i + 1 < s.length()) {
+                    ret = s.substring(i + 1).trim();
+                    break;
+                }
+            }
+        }
+
+        return ret;
+    }
+
+    /**
+     * Gets the benchmark description string of the current editing state.
+     *
+     * @return the string
+     */
+    private String getBenchmarkDescriptionText() {
+        String ret = "";
+
+        for (int i = 0; i < adapter.getCount(); i++) {
+            /* Convert each list item to a proper string representation */
+            EditorItem item = adapter.getItem(i);
+            if (item == null)
+                continue;
+
+            String s = "";
+
+            /*
+             * Append "opt=" if this is an option item, except the
+             * "__custom__" item.
+             */
+            if (item.option != null && item.value != null &&
+                !item.option.name.equals("__custom__"))
+            {
+                s += item.option.name + "=";
+            }
+
+            /*
+             * Append the item value if this is not "__custom__".
+             */
+            if (item.value != null && !item.value.equals("__custom__"))
+                s += item.value;
+
+            /*
+             * Append ":" to the description string if needed.
+             */
+            if (!s.isEmpty() && !ret.isEmpty())
+                ret += ":";
+
+            /* Append the item representation */
+            ret += s;
+        }
+
+        return ret;
+    }
+
+    /**
+     * Creates an EditorItem list from a benchmark description string.
+     *
+     * @param benchDesc the benchmark description string
+     *
+     * @return the list
+     */
+    private ArrayList<EditorItem> getEditorItemList(String benchDesc) {
+        String[] benchArray = benchDesc.split(":");
+        String benchName = benchArray[0].trim();
+
+        if (benchName.isEmpty())
+            benchName = "__custom__";
+
+        /* Find SceneInfo from name */
+        SceneInfo sceneInfo = null;
+        for (SceneInfo si: sceneInfoList) {
+            if (si.name.equals(benchName)) {
+                sceneInfo = si;
+                break;
+            }
+        }
+
+        /* If we couldn't find a matching SceneInfo, use __custom__ */
+        if (sceneInfo == null) {
+            for (SceneInfo si: sceneInfoList) {
+                if (si.name.equals("__custom__")) {
+                    sceneInfo = si;
+                    break;
+                }
+            }
+        }
+
+        ArrayList<EditorItem> l = new ArrayList<EditorItem>();
+
+        /* Append null item for Scene header */
+        l.add(null);
+
+        /* Append scene name item */
+        l.add(new EditorItem(null, sceneInfo.name));
+
+        /* Append null item for Options header */
+        l.add(null);
+
+        /* Append items to the list */
+        if (!sceneInfo.name.equals("__custom__")) {
+            /* Append scene option items */
+            for (SceneInfo.Option opt: sceneInfo.options)
+                l.add(new EditorItem(opt, getOptionValue(benchArray, opt.name)));
+        }
+        else {
+            String desc = new String(benchDesc);
+            if (desc.startsWith("__custom__"))
+                desc = "";
+
+            /* Append scene option items (only one for __custom__) */
+            for (SceneInfo.Option opt: sceneInfo.options)
+                l.add(new EditorItem(opt, desc));
+        }
+
+        return l;
+    }
+
+    /**
+     * Gets a list of information about the available scenes.
+     *
+     * @return the list
+     */
+    private ArrayList<SceneInfo> getSceneInfoList() {
+        ArrayList<SceneInfo> l = new ArrayList<SceneInfo>();
+        SceneInfo customSceneInfo = new SceneInfo("__custom__");
+        customSceneInfo.addOption("__custom__", "Custom benchmark string", "", new String[0]);
+
+        for (Parcelable p: getIntent().getParcelableArrayExtra("scene-info"))
+            l.add((SceneInfo)p);
+
+        /* Sort SceneInfo list by name */
+        Collections.sort(l, new Comparator<SceneInfo>() {
+            public int compare(SceneInfo s1, SceneInfo s2) {
+                return s1.name.compareTo(s2.name);
+            }
+        });
+
+        /* Add the "__custom__" SceneInfo */
+        l.add(customSceneInfo);
+
+        return l;
+    }
+
+    /**
+     * Gets the array of scene names.
+     *
+     * @return the array
+     */
+    private String[] getSceneNames() {
+        ArrayList<String> l = new ArrayList<String>();
+
+        for (SceneInfo si: sceneInfoList) {
+            if (!si.name.isEmpty())
+                l.add(si.name);
+        }
+
+        String[] a = new String[0];
+        return l.toArray(a);
+    }
+
+
+    static private class EditorItem {
+        SceneInfo.Option option;
+
+        public EditorItem(SceneInfo.Option o, String value) {
+            this.option = o;
+            this.value = value;
+        }
+
+        public String value;
+    }
+
+    /**
+     * A ListView adapter that creates list item views from EditorItems
+     */
+    private class EditorItemAdapter extends ArrayAdapter<EditorItem> {
+        static final int VIEW_TYPE_HEADER = 0;
+        static final int VIEW_TYPE_SCENE_NAME = 1;
+        static final int VIEW_TYPE_SCENE_OPTION = 2;
+        static final int VIEW_TYPE_COUNT = 3;
+
+        public ArrayList<EditorItem> items;
+
+        public EditorItemAdapter(Context context, int textViewResourceId,
+                                 ArrayList<EditorItem> items)
+        {
+            super(context, textViewResourceId, items);
+            this.items = items;
+        }
+
+        @Override
+        public boolean isEnabled(int position) {
+            return position == ITEM_POSITION_SCENE_NAME ||
+                   position >= ITEM_POSITION_SCENE_OPTION;
+        }
+
+        @Override
+        public int getItemViewType(int position) {
+            if (position == ITEM_POSITION_SCENE_NAME)
+                return VIEW_TYPE_SCENE_NAME;
+            else if (position >= ITEM_POSITION_SCENE_OPTION)
+                return VIEW_TYPE_SCENE_OPTION;
+            else
+                return VIEW_TYPE_HEADER;
+        }
+
+        @Override
+        public int getViewTypeCount() {
+            return VIEW_TYPE_COUNT;
+        }
+
+        @Override
+        public View getView(int position, View convertView, ViewGroup parent) {
+            int viewType = getItemViewType(position);
+            View v = null;
+
+            if (viewType == VIEW_TYPE_HEADER)
+                v = getViewHeader(position, convertView);
+            else if (viewType == VIEW_TYPE_SCENE_NAME)
+                v = getViewScene(position, convertView);
+            else if (viewType == VIEW_TYPE_SCENE_OPTION)
+                v = getViewOption(position, convertView);
+
+            return v;
+        }
+
+        private View getViewHeader(int position, View convertView) {
+            /* Get the view/widget to use */
+            View v = convertView;
+            if (v == null) {
+                LayoutInflater vi = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
+                v = vi.inflate(R.layout.list_header, null);
+            }
+
+            TextView tv = (TextView) v;
+
+            if (position == ITEM_POSITION_SCENE_NAME_HEADER)
+                tv.setText("Scene");
+            else if (position == ITEM_POSITION_SCENE_OPTION_HEADER)
+                tv.setText("Options");
+
+            return tv;
+        }
+
+        private View getViewScene(int position, View convertView) {
+            /* Get the view/widget to use */
+            View v = convertView;
+            if (v == null) {
+                LayoutInflater vi = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
+                v = vi.inflate(R.layout.list_item, null);
+            }
+
+            EditorItem item = items.get(position);
+
+            TextView title = (TextView) v.findViewById(R.id.title);
+            TextView summary = (TextView) v.findViewById(R.id.summary);
+
+            if (title != null)
+                title.setText(item.value);
+            if (summary != null)
+                summary.setText("The scene to use");
+
+            return v;
+        }
+
+        private View getViewOption(int position, View convertView) {
+            /* Get the view/widget to use */
+            View v = convertView;
+            if (v == null) {
+                LayoutInflater vi = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
+                v = vi.inflate(R.layout.list_item, null);
+            }
+
+            EditorItem item = items.get(position);
+
+            TextView title = (TextView) v.findViewById(R.id.title);
+            TextView summary = (TextView) v.findViewById(R.id.summary);
+            boolean hasUserSetValue = item.value != null;
+            String value = hasUserSetValue ? item.value : item.option.defaultValue;
+
+            if (title != null) {
+                /* If the option has been edited by the user show it with emphasis */
+                SpannableString titleText = new SpannableString(item.option.name + " = " + value);
+                ForegroundColorSpan span = new ForegroundColorSpan(hasUserSetValue ? Color.CYAN : Color.LTGRAY);
+                titleText.setSpan(span, item.option.name.length() + " = ".length(), titleText.length(), 0);
+                title.setText(titleText);
+            }
+
+            if (summary != null)
+                summary.setText(item.option.description);
+
+            return v;
+        }
+    }
+}
diff --git a/android/src/org/linaro/glmark2/GLVisualConfig.java b/android/src/org/linaro/glmark2/GLVisualConfig.java
new file mode 100644
index 0000000..ca4d218
--- /dev/null
+++ b/android/src/org/linaro/glmark2/GLVisualConfig.java
@@ -0,0 +1,46 @@
+/*
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis
+ */
+package org.linaro.glmark2;
+
+/** 
+ * Class that holds a configuration of a GL visual.
+ */
+class GLVisualConfig {
+    public GLVisualConfig() {}
+    public GLVisualConfig(int r, int g, int b, int a, int d, int s, int buf) {
+        red = r;
+        green = g;
+        blue = b;
+        alpha = a;
+        depth = d;
+        stencil = s;
+        buffer = buf;
+    }
+
+    public int red;
+    public int green;
+    public int blue;
+    public int alpha;
+    public int depth;
+    public int stencil;
+    public int buffer;
+}
diff --git a/android/src/org/linaro/glmark2/Glmark2Activity.java b/android/src/org/linaro/glmark2/Glmark2Activity.java
new file mode 100644
index 0000000..bc0dde4
--- /dev/null
+++ b/android/src/org/linaro/glmark2/Glmark2Activity.java
@@ -0,0 +1,88 @@
+package org.linaro.glmark2;
+
+import android.app.Activity;
+import android.os.Bundle;
+import android.opengl.GLSurfaceView;
+import android.app.Dialog;
+import android.app.AlertDialog;
+import android.content.DialogInterface;
+import android.content.Context;
+import android.os.PowerManager;
+import android.os.PowerManager.WakeLock;
+
+public class Glmark2Activity extends Activity {
+    public static final int DIALOG_EGLCONFIG_FAIL_ID = 0;
+    public static final String TAG = "GLMark2";
+    private WakeLock mWakeLock;
+
+    @Override
+    protected void onDestroy() {
+        super.onDestroy();
+        mWakeLock.release();
+    }
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
+        mWakeLock = pm.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK, TAG);
+        mWakeLock.acquire();
+
+        mGLView = new Glmark2SurfaceView(this);
+        setContentView(mGLView);
+    }
+
+    @Override
+    protected void onPause() {
+        super.onPause();
+        mGLView.onPause();
+        Glmark2Activity.this.finish();
+        android.os.Process.killProcess(android.os.Process.myPid());
+    }
+
+    @Override
+    protected void onResume() {
+        super.onResume();
+        mGLView.onResume();
+    }
+
+    @Override
+    protected Dialog onCreateDialog(int id) {
+        Dialog dialog;
+        switch (id) {
+            case DIALOG_EGLCONFIG_FAIL_ID:
+                AlertDialog.Builder builder = new AlertDialog.Builder(this);
+                builder.setMessage("Glmark2 cannot run because it couldn't find a suitable EGLConfig for GLES2.0. Please check that proper GLES2.0 drivers are installed.");
+                builder.setCancelable(false);
+                builder.setPositiveButton("Quit",
+                    new DialogInterface.OnClickListener() {
+                        public void onClick(DialogInterface dialog, int id) {
+                            Glmark2Activity.this.finish();
+                            /*
+                             * Force process shutdown. There is no safer way to
+                             * do this, as we have open threads we can't close
+                             * when we fail to get an EGLConfig
+                             */
+                            android.os.Process.killProcess(android.os.Process.myPid());
+                        }
+                    });
+
+                dialog = builder.create();
+                break;
+            default:
+                dialog = null;
+                break;
+        }
+
+        return dialog;
+    }
+
+
+    private GLSurfaceView mGLView;
+
+    static {
+        System.loadLibrary("glmark2-android");
+    }
+}
+
diff --git a/android/src/org/linaro/glmark2/Glmark2Native.java b/android/src/org/linaro/glmark2/Glmark2Native.java
new file mode 100644
index 0000000..c805385
--- /dev/null
+++ b/android/src/org/linaro/glmark2/Glmark2Native.java
@@ -0,0 +1,34 @@
+/*
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis
+ */
+package org.linaro.glmark2;
+
+import android.content.res.AssetManager;
+
+class Glmark2Native {
+    public static native void init(AssetManager assetManager, String args,
+                                   String logFilePath);
+    public static native void resize(int w, int h);
+    public static native boolean render();
+    public static native void done();
+    public static native int scoreConfig(GLVisualConfig vc, GLVisualConfig target);
+    public static native SceneInfo[] getSceneInfo(AssetManager assetManager);
+}
diff --git a/android/src/org/linaro/glmark2/Glmark2SurfaceView.java b/android/src/org/linaro/glmark2/Glmark2SurfaceView.java
new file mode 100644
index 0000000..35c6c26
--- /dev/null
+++ b/android/src/org/linaro/glmark2/Glmark2SurfaceView.java
@@ -0,0 +1,218 @@
+package org.linaro.glmark2;
+
+import java.io.File;
+
+import android.graphics.PixelFormat;
+import android.opengl.GLSurfaceView;
+import android.app.Activity;
+import android.util.Log;
+
+import javax.microedition.khronos.egl.EGL10;
+import javax.microedition.khronos.egl.EGLDisplay;
+import javax.microedition.khronos.egl.EGLConfig;
+import javax.microedition.khronos.opengles.GL10;
+
+class Glmark2SurfaceView extends GLSurfaceView {
+
+    public static final String LOG_TAG = "glmark2";
+
+    public Glmark2SurfaceView(Activity activity) {
+        super(activity);
+        mActivity = activity;
+
+        setEGLContextClientVersion(2);
+
+        setEGLConfigChooser(getConfigChooser());
+
+        setRenderer(new Glmark2Renderer(this));
+    }
+
+    private EGLConfigChooser getConfigChooser() {
+        String args = mActivity.getIntent().getStringExtra("args");
+
+        if (args == null)
+            args = "";
+
+        String[] argv = args.split(" ");
+
+        /* Find the visual-config option argument */
+        String configString = new String();
+        boolean keepNext = false;
+        for (String arg : argv) {
+            if (keepNext) {
+                configString = arg;
+                break;
+            }
+
+            if (arg.equals("--visual-config"))
+                keepNext = true;
+        }
+
+        /* Parse the config string parameters */
+        String[] configParams = configString.split(":");
+        GLVisualConfig targetConfig = new GLVisualConfig(5, 6, 5, 0, 16, 0, 1);
+
+        for (String param : configParams) {
+            String[] paramKeyValue = param.split("=");
+            if (paramKeyValue.length < 2)
+                continue;
+
+            if (paramKeyValue[0].equals("red") || paramKeyValue[0].equals("r"))
+                targetConfig.red = Integer.parseInt(paramKeyValue[1]);
+            else if (paramKeyValue[0].equals("green") || paramKeyValue[0].equals("g"))
+                targetConfig.green = Integer.parseInt(paramKeyValue[1]);
+            else if (paramKeyValue[0].equals("blue") || paramKeyValue[0].equals("b"))
+                targetConfig.blue = Integer.parseInt(paramKeyValue[1]);
+            else if (paramKeyValue[0].equals("alpha") || paramKeyValue[0].equals("a"))
+                targetConfig.alpha = Integer.parseInt(paramKeyValue[1]);
+            else if (paramKeyValue[0].equals("depth") || paramKeyValue[0].equals("d"))
+                targetConfig.depth = Integer.parseInt(paramKeyValue[1]);
+            else if (paramKeyValue[0].equals("stencil") || paramKeyValue[0].equals("s"))
+                targetConfig.stencil = Integer.parseInt(paramKeyValue[1]);
+            else if (paramKeyValue[0].equals("buffer") || paramKeyValue[0].equals("buf"))
+                targetConfig.buffer = Integer.parseInt(paramKeyValue[1]);
+        }
+
+        return new Glmark2ConfigChooser(targetConfig);
+    }
+
+    /**
+     * EGLConfigChooser that quits with an error dialog when a suitable config
+     * cannot be found.
+     */
+    private class Glmark2ConfigChooser implements EGLConfigChooser {
+        private int[] mAttribList;
+
+        public Glmark2ConfigChooser(GLVisualConfig targetConfig)
+        {
+            mAttribList = new int[] {
+                    EGL10.EGL_RED_SIZE, targetConfig.red,
+                    EGL10.EGL_GREEN_SIZE, targetConfig.green,
+                    EGL10.EGL_BLUE_SIZE, targetConfig.blue,
+                    EGL10.EGL_ALPHA_SIZE, targetConfig.alpha,
+                    EGL10.EGL_DEPTH_SIZE, targetConfig.depth,
+                    EGL10.EGL_STENCIL_SIZE, targetConfig.stencil,
+                    EGL10.EGL_BUFFER_SIZE, targetConfig.buffer,
+                    EGL10.EGL_RENDERABLE_TYPE, 4, /* 4 = EGL_OPENGL_ES2_BIT */
+                    EGL10.EGL_NONE };
+
+            mTargetConfig = targetConfig;
+       }
+
+        @Override
+        public EGLConfig chooseConfig(EGL10 egl, EGLDisplay display) {
+            try {
+                return chooseConfigInternal(egl, display);
+            }
+            catch (Exception e) {
+                /* Log an error message */
+                Log.e(LOG_TAG, "No suitable EGLConfig for GLES2.0 found. Please check that proper GLES2.0 drivers are installed.");
+                /* Display an informative (and lethal for the app) dialog */
+                mActivity.runOnUiThread(new Runnable() {
+                    public void run() {
+                        mActivity.showDialog(Glmark2Activity.DIALOG_EGLCONFIG_FAIL_ID);
+                    }
+                });
+
+                /* Wait here until the app process gets killed... */
+                synchronized (this) {
+                    try { this.wait(); } catch (Exception ex) { }
+                }
+            }
+            return null;
+        }
+
+        private EGLConfig chooseConfigInternal(EGL10 egl, EGLDisplay display) {
+            /* Get the number of available configs matching the attributes */
+            int[] num_config = new int[1];
+            if (!egl.eglChooseConfig(display, mAttribList, null, 0, num_config)) {
+                throw new IllegalArgumentException("eglChooseConfig failed");
+            }
+
+            int numConfigs = num_config[0];
+
+            if (numConfigs <= 0) {
+                throw new IllegalArgumentException("No matching configs found");
+            }
+
+            /* Get the matching configs */
+            EGLConfig[] configs = new EGLConfig[numConfigs];
+            if (!egl.eglChooseConfig(display, mAttribList, configs, numConfigs,
+                                     num_config))
+            {
+                throw new IllegalArgumentException("eglChooseConfig#2 failed");
+            }
+
+            /* Find the best matching config. */
+            int bestScore = Integer.MIN_VALUE;
+            EGLConfig bestConfig = configs[0];
+
+            for (EGLConfig config : configs) {
+                GLVisualConfig vc = new GLVisualConfig();
+                vc.red = findConfigAttrib(egl, display, config,
+                                          EGL10.EGL_RED_SIZE, 0);
+                vc.green = findConfigAttrib(egl, display, config,
+                                            EGL10.EGL_GREEN_SIZE, 0);
+                vc.blue = findConfigAttrib(egl, display, config,
+                                           EGL10.EGL_BLUE_SIZE, 0);
+                vc.alpha = findConfigAttrib(egl, display, config,
+                                            EGL10.EGL_ALPHA_SIZE, 0);
+                vc.depth = findConfigAttrib(egl, display, config,
+                                            EGL10.EGL_DEPTH_SIZE, 0);
+                vc.stencil = findConfigAttrib(egl, display, config,
+                                            EGL10.EGL_STENCIL_SIZE, 0);
+                vc.buffer = findConfigAttrib(egl, display, config,
+                                             EGL10.EGL_BUFFER_SIZE, 0);
+
+                int score = Glmark2Native.scoreConfig(vc, mTargetConfig);
+
+                if (score > bestScore) {
+                    bestScore = score;
+                    bestConfig = config;
+                }
+            }
+
+            return bestConfig;
+        }
+
+        private int findConfigAttrib(EGL10 egl, EGLDisplay display, EGLConfig config,
+                                     int attribute, int defaultValue)
+        {
+            int[] value = new int[] { defaultValue };
+            egl.eglGetConfigAttrib(display, config, attribute, value);
+            return value[0];
+        }
+
+        protected GLVisualConfig mTargetConfig;
+    }
+
+    public Activity getActivity() {
+        return mActivity;
+    }
+
+    private Activity mActivity;
+
+}
+
+class Glmark2Renderer implements GLSurfaceView.Renderer {
+    public Glmark2Renderer(Glmark2SurfaceView view) {
+        mView = view;
+    }
+
+    public void onDrawFrame(GL10 gl) {
+        if (!Glmark2Native.render())
+            mView.getActivity().finish();
+    }
+
+    public void onSurfaceChanged(GL10 gl, int width, int height) {
+        Glmark2Native.resize(width, height);
+    }
+
+    public void onSurfaceCreated(GL10 gl, EGLConfig config) {
+        String args = mView.getActivity().getIntent().getStringExtra("args");
+        File f = new File(mView.getActivity().getFilesDir(), "last_run.log");
+        Glmark2Native.init(mView.getActivity().getAssets(), args, f.getAbsolutePath());
+    }
+
+    private Glmark2SurfaceView mView;
+}
diff --git a/android/src/org/linaro/glmark2/MainActivity.java b/android/src/org/linaro/glmark2/MainActivity.java
new file mode 100644
index 0000000..8e284b2
--- /dev/null
+++ b/android/src/org/linaro/glmark2/MainActivity.java
@@ -0,0 +1,482 @@
+/*
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis
+ */
+package org.linaro.glmark2;
+
+import java.util.ArrayList;
+
+import android.os.Bundle;
+import android.app.Activity;
+import android.app.AlertDialog;
+import android.app.Dialog;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.DialogInterface.OnDismissListener;
+import android.content.Intent;
+import android.content.SharedPreferences;
+import android.preference.PreferenceManager;
+import android.widget.BaseAdapter;
+import android.widget.ArrayAdapter;
+import android.widget.ListView;
+import android.widget.TextView;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.CheckBox;
+import android.view.KeyEvent;
+import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.MenuItem;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.WindowManager;
+import android.view.inputmethod.EditorInfo;
+import android.util.Log;
+import android.widget.AdapterView.OnItemClickListener;
+import android.widget.AdapterView.OnItemLongClickListener;
+import android.widget.AdapterView;
+import android.widget.TextView.OnEditorActionListener;
+
+public class MainActivity extends Activity {
+    public static final int DIALOG_ERROR_ID = 0;
+    public static final int DIALOG_BENCHMARK_ACTIONS_ID = 1;
+    public static final int DIALOG_SAVE_LIST_ID = 2;
+    public static final int DIALOG_LOAD_LIST_ID = 3;
+    public static final int DIALOG_DELETE_LIST_ID = 4;
+
+    public static final int ACTIVITY_GLMARK2_REQUEST_CODE = 1;
+    public static final int ACTIVITY_EDITOR_REQUEST_CODE = 2;
+
+    /**
+     * The supported benchmark item actions.
+     */
+    public enum BenchmarkItemAction {
+        EDIT, DELETE, CLONE, MOVEUP, MOVEDOWN
+    }
+
+    BaseAdapter adapter;
+    SceneInfo[] sceneInfoList;
+    BenchmarkListManager benchmarkListManager;
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+        ArrayList<String> savedBenchmarks = null;
+
+        if (savedInstanceState != null)
+            savedBenchmarks = savedInstanceState.getStringArrayList("benchmarks");
+
+        init(savedBenchmarks);
+    }
+
+    @Override
+    protected void onSaveInstanceState(Bundle outState) {
+        super.onSaveInstanceState(outState);
+        outState.putStringArrayList("benchmarks", benchmarkListManager.getBenchmarkList());
+    }
+
+    @Override
+    protected Dialog onCreateDialog(int id, Bundle bundle) {
+        final CharSequence[] benchmarkActions = {"Delete", "Clone", "Move Up", "Move Down"};
+        final BenchmarkItemAction[] benchmarkActionsId = {
+                BenchmarkItemAction.DELETE, BenchmarkItemAction.CLONE,
+                BenchmarkItemAction.MOVEUP, BenchmarkItemAction.MOVEDOWN
+        };
+        final int finalId = id;
+
+        Dialog dialog;
+
+        switch (id) {
+            case DIALOG_ERROR_ID:
+                {
+                AlertDialog.Builder builder = new AlertDialog.Builder(this);
+                builder.setMessage(bundle.getString("message") + ": " +
+                                   bundle.getString("detail"));
+                builder.setCancelable(false);
+                builder.setPositiveButton("OK", null);
+                dialog = builder.create();
+                }
+                break;
+
+            case DIALOG_BENCHMARK_ACTIONS_ID:
+                {
+                final int benchmarkPos = bundle.getInt("benchmark-pos");
+                AlertDialog.Builder builder = new AlertDialog.Builder(this);
+                builder.setTitle("Pick an action");
+                builder.setItems(benchmarkActions, new DialogInterface.OnClickListener() {
+                    public void onClick(DialogInterface dialog, int item) {
+                        doBenchmarkItemAction(benchmarkPos, benchmarkActionsId[item], null);
+                        dismissDialog(DIALOG_BENCHMARK_ACTIONS_ID);
+                    }
+                });
+                dialog = builder.create();
+                }
+                break;
+
+            case DIALOG_SAVE_LIST_ID:
+                {
+                AlertDialog.Builder builder = new AlertDialog.Builder(this);
+                View layout = getLayoutInflater().inflate(R.layout.save_dialog, null);
+                final EditText input = (EditText) layout.findViewById(R.id.listName);
+                final CheckBox checkBox = (CheckBox) layout.findViewById(R.id.external);
+
+                input.setOnEditorActionListener(new OnEditorActionListener() {
+                    public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
+                        if (actionId == EditorInfo.IME_ACTION_DONE ||
+                            (event != null && event.getKeyCode() == KeyEvent.KEYCODE_ENTER &&
+                             event.getAction() == KeyEvent.ACTION_UP))
+                        {
+                            String listName = v.getText().toString();
+                            try {
+                                benchmarkListManager.saveBenchmarkList(listName,
+                                                                       checkBox.isChecked());
+                            }
+                            catch (Exception ex) {
+                                Bundle bundle = new Bundle();
+                                bundle.putString("message", "Cannot save list to file " + listName);
+                                bundle.putString("detail", ex.getMessage());
+                                showDialog(DIALOG_ERROR_ID, bundle);
+                            }
+                            dismissDialog(DIALOG_SAVE_LIST_ID);
+                        }
+                        return true;
+                    }
+                });
+
+                builder.setTitle("Save list as");
+                builder.setView(layout);
+
+                dialog = builder.create();
+                dialog.getWindow().setSoftInputMode(
+                        WindowManager.LayoutParams.SOFT_INPUT_ADJUST_PAN |
+                        WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE
+                        );
+                }
+                break;
+
+            case DIALOG_LOAD_LIST_ID:
+            case DIALOG_DELETE_LIST_ID:
+                {
+                AlertDialog.Builder builder = new AlertDialog.Builder(this);
+                if (id == DIALOG_LOAD_LIST_ID)
+                    builder.setTitle("Load list");
+                else
+                    builder.setTitle("Delete list");
+                final String[] savedLists = benchmarkListManager.getSavedLists();
+
+                builder.setItems(savedLists, new DialogInterface.OnClickListener() {
+                    public void onClick(DialogInterface dialog, int index) {
+                        String desc = savedLists[index];
+                        String filename = "";
+                        boolean external = false;
+
+                        if (desc.startsWith("internal/")) {
+                            filename = desc.replace("internal/", "");
+                            external = false;
+                        }
+                        else if (desc.startsWith("external/")) {
+                            filename = desc.replace("external/", "");
+                            external = true;
+                        }
+                            
+                        try {
+                            if (finalId == DIALOG_LOAD_LIST_ID) {
+                                benchmarkListManager.loadBenchmarkList(filename, external);
+                                adapter.notifyDataSetChanged();
+                            }
+                            else {
+                                benchmarkListManager.deleteBenchmarkList(filename, external);
+                            }
+
+                        }
+                        catch (Exception ex) {
+                            Bundle bundle = new Bundle();
+                            if (finalId == DIALOG_LOAD_LIST_ID)
+                                bundle.putString("message", "Cannot load list " + desc);
+                            else
+                                bundle.putString("message", "Cannot delete list " + desc);
+                            bundle.putString("detail", ex.getMessage());
+                            showDialog(DIALOG_ERROR_ID, bundle);
+                        }
+                        dismissDialog(finalId);
+                    }
+                });
+
+                dialog = builder.create();
+                }
+                break;
+
+            default:
+                dialog = null;
+                break;
+        }
+
+        if (dialog != null) {
+            dialog.setOnDismissListener(new OnDismissListener() {
+                public void onDismiss(DialogInterface dialog) {
+                    removeDialog(finalId);
+                }
+            });
+        }
+
+        return dialog;
+    }
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        MenuInflater inflater = getMenuInflater();
+        inflater.inflate(R.menu.main_options_menu, menu);
+        return true;
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        boolean ret = true;
+
+        switch (item.getItemId()) {
+            case R.id.save_benchmark_list:
+                showDialog(DIALOG_SAVE_LIST_ID);
+                ret = true;
+                break;
+            case R.id.load_benchmark_list:
+                showDialog(DIALOG_LOAD_LIST_ID);
+                ret = true;
+                break;
+            case R.id.delete_benchmark_list:
+                showDialog(DIALOG_DELETE_LIST_ID);
+                ret = true;
+                break;
+            case R.id.settings:
+                startActivity(new Intent(MainActivity.this, MainPreferencesActivity.class));
+                ret = true;
+                break;
+            case R.id.results:
+                startActivity(new Intent(MainActivity.this, ResultsActivity.class));
+                ret = true;
+                break;
+            case R.id.about:
+                startActivity(new Intent(MainActivity.this, AboutActivity.class));
+                ret = true;
+                break;
+            default:
+                ret = super.onOptionsItemSelected(item);
+                break;
+        }
+
+        return ret;
+    }
+
+    @Override
+    public void onActivityResult(int requestCode, int resultCode, Intent data) {
+        if (requestCode == ACTIVITY_GLMARK2_REQUEST_CODE)
+        {
+            startActivity(new Intent(this, ResultsActivity.class));
+            return;
+        }
+        else if (requestCode == ACTIVITY_EDITOR_REQUEST_CODE &&
+                 resultCode == RESULT_OK)
+        {
+            String benchmarkText = data.getStringExtra("benchmark-text");
+            int benchmarkPos = data.getIntExtra("benchmark-pos", 0);
+            doBenchmarkItemAction(benchmarkPos, BenchmarkItemAction.EDIT, benchmarkText);
+        }
+    }
+
+    /**
+     * Initialize the activity.
+     *
+     * @param savedBenchmarks a list of benchmarks to load the list with (or null)
+     */
+    private void init(ArrayList<String> savedBenchmarks)
+    {
+        /* Initialize benchmark list manager */
+        benchmarkListManager = new BenchmarkListManager(this, savedBenchmarks);
+        final ArrayList<String> benchmarks = benchmarkListManager.getBenchmarkList();
+
+        /* Get Scene information */
+        sceneInfoList = Glmark2Native.getSceneInfo(getAssets());
+
+        /* Set up the run button */
+        Button button = (Button) findViewById(R.id.runButton);
+        button.setOnClickListener(new View.OnClickListener() {
+            public void onClick(View v) {
+                SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
+                Intent intent = new Intent(MainActivity.this, Glmark2Activity.class);
+                String args = "";
+                for (int i = 0; i < benchmarks.size() - 1; i++)
+                    args += "-b \"" + benchmarks.get(i) + "\" ";
+                if (prefs.getBoolean("run_forever", false))
+                    args += "--run-forever ";
+                if (prefs.getBoolean("log_debug", false))
+                    args += "--debug ";
+                if (!args.isEmpty())
+                    intent.putExtra("args", args);
+                
+                if (prefs.getBoolean("show_results", true))
+                    startActivityForResult(intent, ACTIVITY_GLMARK2_REQUEST_CODE);
+                else
+                    startActivity(intent);
+            }
+        });
+
+        /* Set up the benchmark list view */
+        ListView lv = (ListView) findViewById(R.id.benchmarkListView);
+        adapter = new BenchmarkAdapter(this, R.layout.list_item, benchmarks);
+        lv.setAdapter(adapter);
+
+        lv.setOnItemClickListener(new OnItemClickListener() {
+            public void onItemClick(AdapterView<?> parentView, View childView, int position, long id) {
+                Intent intent = new Intent(MainActivity.this, EditorActivity.class);
+                String t = benchmarks.get(position);
+                if (position == benchmarks.size() - 1)
+                    t = "";
+                intent.putExtra("benchmark-text", t);
+                intent.putExtra("benchmark-pos", position);
+                intent.putExtra("scene-info", sceneInfoList);
+                startActivityForResult(intent, ACTIVITY_EDITOR_REQUEST_CODE);
+            }
+        });
+
+        lv.setOnItemLongClickListener(new OnItemLongClickListener() {
+            public boolean onItemLongClick(AdapterView<?> parentView, View childView, int position, long id) {
+                if (position < benchmarks.size() - 1) {
+                    Bundle bundle = new Bundle();
+                    bundle.putInt("benchmark-pos", position);
+                    showDialog(DIALOG_BENCHMARK_ACTIONS_ID, bundle);
+                }
+                return true;
+            }
+        });
+
+    }
+
+    /**
+     * Perform an action on an listview benchmark item.
+     *
+     * @param position the position of the item in the listview
+     * @param action the action to perform
+     * @param data extra data needed by some actions
+     */
+    private void doBenchmarkItemAction(int position, BenchmarkItemAction action, String data)
+    {
+        int scrollPosition = position;
+        final ArrayList<String> benchmarks = benchmarkListManager.getBenchmarkList();
+
+        switch(action) {
+            case EDIT:
+                if (position == benchmarks.size() - 1) {
+                    benchmarks.add(position, data);
+                    scrollPosition = position + 1;
+                }
+                else {
+                    benchmarks.set(position, data);
+                }
+                break;
+            case DELETE:
+                benchmarks.remove(position);
+                break;
+            case CLONE:
+                {
+                    String s = benchmarks.get(position);
+                    benchmarks.add(position, s);
+                    scrollPosition = position + 1;
+                }
+                break;
+            case MOVEUP:
+                if (position > 0) {
+                    String up = benchmarks.get(position - 1);
+                    String s = benchmarks.get(position);
+                    benchmarks.set(position - 1, s);
+                    benchmarks.set(position, up);
+                    scrollPosition = position - 1;
+                }
+                break;
+            case MOVEDOWN:
+                if (position < benchmarks.size() - 2) {
+                    String down = benchmarks.get(position + 1);
+                    String s = benchmarks.get(position);
+                    benchmarks.set(position + 1, s);
+                    benchmarks.set(position, down);
+                    scrollPosition = position + 1;
+                }
+                break;
+            default:
+                break;
+        }
+
+
+        adapter.notifyDataSetChanged();
+
+        /* Scroll the list view so that the item of interest remains visible */
+        final int finalScrollPosition = scrollPosition;
+        final ListView lv = (ListView) findViewById(R.id.benchmarkListView);
+        lv.post(new Runnable() {
+            @Override
+            public void run() {
+                lv.smoothScrollToPosition(finalScrollPosition);
+            }
+        });
+    }
+
+    /**
+     * A ListView adapter that creates item views from benchmark strings.
+     */
+    private class BenchmarkAdapter extends ArrayAdapter<String> {
+        private ArrayList<String> items;
+
+        public BenchmarkAdapter(Context context, int textViewResourceId, ArrayList<String> items) {
+            super(context, textViewResourceId, items);
+            this.items = items;
+        }
+
+        @Override
+        public View getView(int position, View convertView, ViewGroup parent) {
+            /* Get the view/widget to use */
+            View v = convertView;
+            if (v == null) {
+                LayoutInflater vi = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
+                v = vi.inflate(R.layout.list_item, null);
+            }
+
+            /* Split the benchmark into its scene name and its options */
+            String benchmark = items.get(position);
+            String[] ba = benchmark.split(":", 2);
+
+            if (ba != null) {
+                TextView title = (TextView) v.findViewById(R.id.title);
+                TextView summary = (TextView) v.findViewById(R.id.summary);
+                title.setText("");
+                summary.setText("");
+
+                if (title != null && ba.length > 0)
+                    title.setText(ba[0]);
+                if (summary != null && ba.length > 1)
+                    summary.setText(ba[1]);
+            }
+            return v;
+        }
+    }
+
+    static {
+        System.loadLibrary("glmark2-android");
+    }
+}
diff --git a/android/src/org/linaro/glmark2/MainPreferencesActivity.java b/android/src/org/linaro/glmark2/MainPreferencesActivity.java
new file mode 100644
index 0000000..76447ec
--- /dev/null
+++ b/android/src/org/linaro/glmark2/MainPreferencesActivity.java
@@ -0,0 +1,33 @@
+/*
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis
+ */
+package org.linaro.glmark2;
+ 
+import android.os.Bundle;
+import android.preference.PreferenceActivity;
+ 
+public class MainPreferencesActivity extends PreferenceActivity {
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        addPreferencesFromResource(R.xml.preferences);
+    }
+}
diff --git a/android/src/org/linaro/glmark2/ResultsActivity.java b/android/src/org/linaro/glmark2/ResultsActivity.java
new file mode 100644
index 0000000..d0e8756
--- /dev/null
+++ b/android/src/org/linaro/glmark2/ResultsActivity.java
@@ -0,0 +1,58 @@
+/*
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis
+ */
+package org.linaro.glmark2;
+
+import java.io.*;
+
+import android.app.Activity;
+import android.os.Bundle;
+import android.widget.TextView;
+
+public class ResultsActivity extends Activity {
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        setContentView(R.layout.activity_results);
+        TextView tv = (TextView) findViewById(R.id.results);
+
+        File f = new File(getFilesDir(), "last_run.log");
+
+        try {
+            /* Read log from file */
+            BufferedReader reader = new BufferedReader(new FileReader(f));
+            String line = null;
+            StringBuffer sb = new StringBuffer();
+
+            while ((line = reader.readLine()) != null) {
+                sb.append(line);
+                sb.append('\n');
+            }
+
+            reader.close();
+            tv.setText(sb.toString());
+        }
+        catch (Exception ex) {
+        }
+    }
+}
+
diff --git a/android/src/org/linaro/glmark2/SceneInfo.java b/android/src/org/linaro/glmark2/SceneInfo.java
new file mode 100644
index 0000000..5b4ae5f
--- /dev/null
+++ b/android/src/org/linaro/glmark2/SceneInfo.java
@@ -0,0 +1,96 @@
+/*
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis
+ */
+package org.linaro.glmark2;
+
+import android.os.Parcelable;
+import android.os.Parcel;
+import java.util.ArrayList;
+
+class SceneInfo implements Parcelable {
+    static class Option {
+        String name;
+        String description;
+        String defaultValue;
+        String[] acceptableValues;
+    }
+
+    public SceneInfo(String name) {
+        this.name = name;
+        this.options = new ArrayList<Option>();
+    }
+
+    public void addOption(String name, String description, String defaultValue,
+                          String[] acceptableValues)
+    {
+        Option opt = new Option();
+        opt.name = name;
+        opt.description = description;
+        opt.defaultValue = defaultValue;
+        opt.acceptableValues = acceptableValues;
+        this.options.add(opt);
+    }
+
+    public String name;
+    public ArrayList<Option> options;
+
+    /* Parcelable interface */
+    public static final Parcelable.Creator<SceneInfo> CREATOR =
+        new Parcelable.Creator<SceneInfo>() {
+            public SceneInfo createFromParcel(Parcel in) {
+                return new SceneInfo(in);
+            }
+
+            public SceneInfo[] newArray(int size) {
+                return new SceneInfo[size];
+            }
+        };
+
+    public int describeContents() {
+        return 0;
+    }
+
+    public void writeToParcel(Parcel out, int flags) {
+        out.writeString(name);
+        out.writeInt(options.size());
+        for (Option opt: options) {
+            out.writeString(opt.name);
+            out.writeString(opt.description);
+            out.writeString(opt.defaultValue);
+            out.writeStringArray(opt.acceptableValues);
+        }
+    }
+
+    private SceneInfo(Parcel in) {
+        name = in.readString();
+        options = new ArrayList<Option>();
+
+        int size = in.readInt();
+        for (int i = 0; i < size; i++) {
+            Option opt = new Option();
+            opt.name = in.readString();
+            opt.description = in.readString();
+            opt.defaultValue = in.readString();
+            opt.acceptableValues = in.createStringArray();
+            options.add(opt);
+        }
+    }
+}
diff --git a/data/models/asteroid-high.3ds b/data/models/asteroid-high.3ds
new file mode 100644
index 0000000..369b9fe
--- /dev/null
+++ b/data/models/asteroid-high.3ds
diff --git a/data/models/asteroid-low.3ds b/data/models/asteroid-low.3ds
new file mode 100644
index 0000000..903bd2e
--- /dev/null
+++ b/data/models/asteroid-low.3ds
diff --git a/data/models/bunny.obj b/data/models/bunny.obj
new file mode 100644
index 0000000..d9f8c97
--- /dev/null
+++ b/data/models/bunny.obj
@@ -0,0 +1,104501 @@
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diff --git a/data/models/cat.3ds b/data/models/cat.3ds
new file mode 100644
index 0000000..c6cce29
--- /dev/null
+++ b/data/models/cat.3ds
diff --git a/data/models/cube.3ds b/data/models/cube.3ds
new file mode 100644
index 0000000..35b8300
--- /dev/null
+++ b/data/models/cube.3ds
diff --git a/data/models/horse.3ds b/data/models/horse.3ds
new file mode 100644
index 0000000..4aa0c3c
--- /dev/null
+++ b/data/models/horse.3ds
diff --git a/data/models/jellyfish.jobj b/data/models/jellyfish.jobj
new file mode 100644
index 0000000..2ce5e2c
--- /dev/null
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diff --git a/data/shaders/README.shaders b/data/shaders/README.shaders
new file mode 100644
index 0000000..3bc8c88
--- /dev/null
+++ b/data/shaders/README.shaders
@@ -0,0 +1,5 @@
+This directory contains the shader sources used by glmark2 benchmarks.
+
+Note that many of the shaders are either incomplete or are templates and can't
+be used directly! Missing pieces (eg constants, precision statements, actual
+code) are added dynamically at runtime.
diff --git a/data/shaders/buffer-wireframe.frag b/data/shaders/buffer-wireframe.frag
new file mode 100644
index 0000000..866c281
--- /dev/null
+++ b/data/shaders/buffer-wireframe.frag
@@ -0,0 +1,17 @@
+varying vec4 dist;
+
+const vec4 LINE_COLOR = vec4(1.0);
+const vec4 TRIANGLE_COLOR = vec4(0.0, 0.5, 0.8, 0.8);
+
+void main(void)
+{
+    // Get the minimum distance of this fragment from a triangle edge.
+    // We need to multiply with dist.w to undo the workaround we had
+    // to perform to get linear interpolation (instead of perspective correct).
+    float d = min(dist.x * dist.w, min(dist.y * dist.w, dist.z * dist.w));
+
+    // Get the intensity of the wireframe line
+    float I = exp2(-2.0 * d * d);
+
+    gl_FragColor = mix(TRIANGLE_COLOR, LINE_COLOR, I);
+}
diff --git a/data/shaders/buffer-wireframe.vert b/data/shaders/buffer-wireframe.vert
new file mode 100644
index 0000000..e9041f7
--- /dev/null
+++ b/data/shaders/buffer-wireframe.vert
@@ -0,0 +1,57 @@
+// Wireframe shader based on:
+// J. A. Bærentzen, S. Munk-Lund, M. Gjøl, and B. D. Larsen,
+// “Two methods for antialiased wireframe drawing with hidden
+// line removal,� in Proceedings of the Spring Conference in
+// Computer Graphics, 2008.
+//
+// We are not using geometry shaders, though, as they are not
+// available in GLES 2.0.
+
+attribute vec3 position;
+// Coordinates of the triangle vertices this vertex belongs to
+attribute vec3 tvertex0;
+attribute vec3 tvertex1;
+attribute vec3 tvertex2;
+
+uniform vec2 Viewport;
+uniform mat4 ModelViewProjectionMatrix;
+
+varying vec4 dist;
+
+void main(void)
+{
+    // Get the clip coordinates of all vertices
+    vec4 pos  = ModelViewProjectionMatrix * vec4(position, 1.0);
+    vec4 pos0 = ModelViewProjectionMatrix * vec4(tvertex0, 1.0);
+    vec4 pos1 = ModelViewProjectionMatrix * vec4(tvertex1, 1.0);
+    vec4 pos2 = ModelViewProjectionMatrix * vec4(tvertex2, 1.0);
+
+    // Get the screen coordinates of all vertices
+    vec3 p  = vec3(0.5 * Viewport * (pos.xy / pos.w), 0.0);
+    vec3 p0 = vec3(0.5 * Viewport * (pos0.xy / pos0.w), 0.0);
+    vec3 p1 = vec3(0.5 * Viewport * (pos1.xy / pos1.w), 0.0);
+    vec3 p2 = vec3(0.5 * Viewport * (pos2.xy / pos2.w), 0.0);
+
+    // Get the vectors representing the edges of the current
+    // triangle primitive. 'vN' is the edge opposite vertex N.
+    vec3 v0 = p2 - p1;
+    vec3 v1 = p2 - p0;
+    vec3 v2 = p1 - p0;
+
+    // Calculate the distance of the current vertex from all
+    // the triangle edges. The distance of point p from line
+    // v is length(cross(p - p1, v)) / length(v), where
+    // p1 is any of the two edge points of v.
+    float d0 = length(cross(p - p1, v0)) / length(v0);
+    float d1 = length(cross(p - p2, v1)) / length(v1);
+    float d2 = length(cross(p - p0, v2)) / length(v2);
+
+    // OpenGL(ES) performs perspective-correct interpolation
+    // (it divides by .w) but we want linear interpolation. To
+    // work around this, we premultiply by pos.w here and then
+    // multiple with the inverse (stored in dist.w) in the fragment
+    // shader to undo this operation.
+    dist = vec4(pos.w * d0, pos.w * d1, pos.w * d2, 1.0 / pos.w);
+
+    gl_Position = pos;
+}
diff --git a/data/shaders/bump-height.frag b/data/shaders/bump-height.frag
new file mode 100644
index 0000000..73203b7
--- /dev/null
+++ b/data/shaders/bump-height.frag
@@ -0,0 +1,56 @@
+#ifdef GL_ES

+precision mediump float;

+#endif

+

+uniform sampler2D HeightMap;

+

+varying vec2 TextureCoord;

+varying vec3 NormalEye;

+varying vec3 TangentEye;

+varying vec3 BitangentEye;

+

+void main(void)

+{

+    const vec4 LightSourceAmbient = vec4(0.1, 0.1, 0.1, 1.0);

+    const vec4 LightSourceDiffuse = vec4(0.8, 0.8, 0.8, 1.0);

+    const vec4 LightSourceSpecular = vec4(0.8, 0.8, 0.8, 1.0);

+    const vec4 MaterialAmbient = vec4(1.0, 1.0, 1.0, 1.0);

+    const vec4 MaterialDiffuse = vec4(1.0, 1.0, 1.0, 1.0);

+    const vec4 MaterialSpecular = vec4(0.2, 0.2, 0.2, 1.0);

+    const float MaterialShininess = 100.0;

+    const float height_factor = 13.0;

+

+    // Get the data from the height map

+    float height0 = texture2D(HeightMap, TextureCoord).x;

+    float heightX = texture2D(HeightMap, TextureCoord + vec2(TextureStepX, 0.0)).x;

+    float heightY = texture2D(HeightMap, TextureCoord + vec2(0.0, TextureStepY)).x;

+    vec2 dh = vec2(heightX - height0, heightY - height0);

+

+    // Adjust the normal based on the height map data

+    vec3 N = NormalEye - height_factor * dh.x * TangentEye -

+                         height_factor * dh.y * BitangentEye;

+    N = normalize(N);

+

+    // In the lighting model we are using here (Blinn-Phong with light at

+    // infinity, viewer at infinity), the light position/direction and the

+    // half vector is constant for the all the fragments.

+    vec3 L = normalize(LightSourcePosition.xyz);

+    vec3 H = normalize(LightSourceHalfVector);

+

+    // Calculate the diffuse color according to Lambertian reflectance

+    vec4 diffuse = MaterialDiffuse * LightSourceDiffuse * max(dot(N, L), 0.0);

+

+    // Calculate the ambient color

+    vec4 ambient = MaterialAmbient * LightSourceAmbient;

+

+    // Calculate the specular color according to the Blinn-Phong model

+    vec4 specular = MaterialSpecular * LightSourceSpecular *

+                    pow(max(dot(N,H), 0.0), MaterialShininess);

+

+    // Calculate the final color

+    gl_FragColor = ambient + specular + diffuse;

+

+    //gl_FragColor = vec4(height_diff_raw.xy, 0.0, 1.0);

+    //gl_FragColor = vec4(height_diff_scaled.xy, 0.0, 1.0);

+    //gl_FragColor = vec4(Tangent, 1.0);

+}

diff --git a/data/shaders/bump-height.vert b/data/shaders/bump-height.vert
new file mode 100644
index 0000000..cf49d7a
--- /dev/null
+++ b/data/shaders/bump-height.vert
@@ -0,0 +1,28 @@
+attribute vec3 position;

+attribute vec2 texcoord;

+attribute vec3 normal;

+attribute vec3 tangent;

+

+uniform mat4 ModelViewProjectionMatrix;

+uniform mat4 NormalMatrix;

+

+varying vec2 TextureCoord;

+varying vec3 NormalEye;

+varying vec3 TangentEye;

+varying vec3 BitangentEye;

+

+void main(void)

+{

+    TextureCoord = texcoord;

+

+    // Transform normal, tangent and bitangent to eye space, keeping

+    // all of them perpendicular to the Normal. That is why we use

+    // NormalMatrix, instead of ModelView, to transform the tangent and

+    // bitangent.

+    NormalEye = normalize(vec3(NormalMatrix * vec4(normal, 1.0)));

+    TangentEye = normalize(vec3(NormalMatrix * vec4(tangent, 1.0)));

+    BitangentEye = normalize(vec3(NormalMatrix * vec4(cross(normal, tangent), 1.0)));

+

+    // Transform the position to clip coordinates

+    gl_Position = ModelViewProjectionMatrix * vec4(position, 1.0);

+}

diff --git a/data/shaders/bump-normals-tangent.frag b/data/shaders/bump-normals-tangent.frag
new file mode 100644
index 0000000..3ffe9c5
--- /dev/null
+++ b/data/shaders/bump-normals-tangent.frag
@@ -0,0 +1,49 @@
+#ifdef GL_ES

+precision mediump float;

+#endif

+

+uniform sampler2D NormalMap;

+

+varying vec2 TextureCoord;

+varying mat4 TangentToEyeMatrix;

+

+void main(void)

+{

+    const vec4 LightSourceAmbient = vec4(0.1, 0.1, 0.1, 1.0);

+    const vec4 LightSourceDiffuse = vec4(0.8, 0.8, 0.8, 1.0);

+    const vec4 LightSourceSpecular = vec4(0.8, 0.8, 0.8, 1.0);

+    const vec4 MaterialAmbient = vec4(1.0, 1.0, 1.0, 1.0);

+    const vec4 MaterialDiffuse = vec4(1.0, 1.0, 1.0, 1.0);

+    const vec4 MaterialSpecular = vec4(0.2, 0.2, 0.2, 1.0);

+    const float MaterialShininess = 100.0;

+

+    // Get the raw normal XYZ data from the normal map

+    vec3 normal_raw = texture2D(NormalMap, TextureCoord).xyz;

+

+    // Map "color" range [0, 1.0] to normal range [-1.0, 1.0]

+    vec3 normal_scaled = normal_raw * 2.0 - 1.0;

+

+    // The normal data is in tangent space, convert it to eye space so that

+    // lighting calculations can work (light information is in eye space).

+    vec3 N = normalize(vec3(TangentToEyeMatrix * vec4(normal_scaled, 1.0)));

+

+    // In the lighting model we are using here (Blinn-Phong with light at

+    // infinity, viewer at infinity), the light position/direction and the

+    // half vector is constant for the all the fragments.

+    vec3 L = normalize(LightSourcePosition.xyz);

+    vec3 H = normalize(LightSourceHalfVector);

+

+    // Calculate the diffuse color according to Lambertian reflectance

+    vec4 diffuse = MaterialDiffuse * LightSourceDiffuse * max(dot(N, L), 0.0);

+

+    // Calculate the ambient color

+    vec4 ambient = MaterialAmbient * LightSourceAmbient;

+

+    // Calculate the specular color according to the Blinn-Phong model

+    vec4 specular = MaterialSpecular * LightSourceSpecular *

+                    pow(max(dot(N,H), 0.0), MaterialShininess);

+

+    // Calculate the final color

+    gl_FragColor = ambient + specular + diffuse;

+    //gl_FragColor = vec4(N, 1.0);

+}

diff --git a/data/shaders/bump-normals-tangent.vert b/data/shaders/bump-normals-tangent.vert
new file mode 100644
index 0000000..0a61a00
--- /dev/null
+++ b/data/shaders/bump-normals-tangent.vert
@@ -0,0 +1,39 @@
+attribute vec3 position;

+attribute vec2 texcoord;

+attribute vec3 normal;

+attribute vec3 tangent;

+

+uniform mat4 ModelViewProjectionMatrix;

+uniform mat4 NormalMatrix;

+

+varying vec2 TextureCoord;

+varying mat4 TangentToEyeMatrix;

+

+void main(void)

+{

+    TextureCoord = texcoord;

+

+    // Calculate bitangent

+    vec3 bitangent = normalize(cross(normal, tangent));

+

+    // Calculate tangent space to eye space transformation matrix.

+    // We need this matrix in the fragment shader to transform the data

+    // from the normal map, which is in tangent space, to eye space,

+    // so that we can perform meaningful lighting calculations. Alternatively,

+    // we could have used an EyeToTangentMatrix, to convert light direction etc

+    // to tangent space.

+

+    // First calculate a tangent space to object space transformation matrix.

+    mat4 TangentToObject = mat4(tangent.x, tangent.y, tangent.z, 0.0,

+                                bitangent.x, bitangent.y, bitangent.z, 0.0,

+                                normal.x, normal.y, normal.z, 0.0,

+                                0.0, 0.0, 0.0, 1.0);

+

+    // Multiply with the NormalMatrix to further transform from object

+    // space to eye space (we are manipulating normals, so we can't use

+    // the ModelView matrix for this step!).

+    TangentToEyeMatrix = NormalMatrix * TangentToObject;

+

+    // Transform the position to clip coordinates

+    gl_Position = ModelViewProjectionMatrix * vec4(position, 1.0);

+}

diff --git a/data/shaders/bump-normals.frag b/data/shaders/bump-normals.frag
new file mode 100644
index 0000000..027abed
--- /dev/null
+++ b/data/shaders/bump-normals.frag
@@ -0,0 +1,44 @@
+uniform sampler2D NormalMap;
+uniform mat4 NormalMatrix;
+
+varying vec2 TextureCoord;
+
+void main(void)
+{
+    const vec4 LightSourceAmbient = vec4(0.1, 0.1, 0.1, 1.0);
+    const vec4 LightSourceDiffuse = vec4(0.8, 0.8, 0.8, 1.0);
+    const vec4 LightSourceSpecular = vec4(0.8, 0.8, 0.8, 1.0);
+    const vec4 MaterialAmbient = vec4(1.0, 1.0, 1.0, 1.0);
+    const vec4 MaterialDiffuse = vec4(1.0, 1.0, 1.0, 1.0);
+    const vec4 MaterialSpecular = vec4(0.2, 0.2, 0.2, 1.0);
+    const float MaterialShininess = 100.0;
+
+    // Get the raw normal XYZ data from the normal map
+    vec3 normal_raw = texture2D(NormalMap, TextureCoord).xyz;
+    // Map "color" range [0, 1.0] to normal range [-1.0, 1.0]
+    vec3 normal_scaled = normal_raw * 2.0 - 1.0;
+
+    // Convert the normal to eye coordinates. Note that the normal map
+    // we are using is using object coordinates (not tangent!) for the
+    // normals, so we can multiply by the NormalMatrix as usual.
+    vec3 N = normalize(vec3(NormalMatrix * vec4(normal_scaled, 1.0)));
+
+    // In the lighting model we are using here (Blinn-Phong with light at
+    // infinity, viewer at infinity), the light position/direction and the
+    // half vector is constant for the all the fragments.
+    vec3 L = normalize(LightSourcePosition.xyz);
+    vec3 H = normalize(LightSourceHalfVector);
+
+    // Calculate the diffuse color according to Lambertian reflectance
+    vec4 diffuse = MaterialDiffuse * LightSourceDiffuse * max(dot(N, L), 0.0);
+
+    // Calculate the ambient color
+    vec4 ambient = MaterialAmbient * LightSourceAmbient;
+
+    // Calculate the specular color according to the Blinn-Phong model
+    vec4 specular = MaterialSpecular * LightSourceSpecular *
+                    pow(max(dot(N,H), 0.0), MaterialShininess);
+
+    // Calculate the final color
+    gl_FragColor = ambient + specular + diffuse;
+}
diff --git a/data/shaders/bump-normals.vert b/data/shaders/bump-normals.vert
new file mode 100644
index 0000000..cfa12b3
--- /dev/null
+++ b/data/shaders/bump-normals.vert
@@ -0,0 +1,14 @@
+attribute vec3 position;
+attribute vec2 texcoord;
+
+uniform mat4 ModelViewProjectionMatrix;
+
+varying vec2 TextureCoord;
+
+void main(void)
+{
+    TextureCoord = texcoord;
+
+    // Transform the position to clip coordinates
+    gl_Position = ModelViewProjectionMatrix * vec4(position, 1.0);
+}
diff --git a/data/shaders/bump-poly.frag b/data/shaders/bump-poly.frag
new file mode 100644
index 0000000..ffd4c6c
--- /dev/null
+++ b/data/shaders/bump-poly.frag
@@ -0,0 +1,33 @@
+varying vec3 Normal;
+
+void main(void)
+{
+    const vec4 LightSourceAmbient = vec4(0.1, 0.1, 0.1, 1.0);
+    const vec4 LightSourceDiffuse = vec4(0.8, 0.8, 0.8, 1.0);
+    const vec4 LightSourceSpecular = vec4(0.8, 0.8, 0.8, 1.0);
+    const vec4 MaterialAmbient = vec4(1.0, 1.0, 1.0, 1.0);
+    const vec4 MaterialDiffuse = vec4(1.0, 1.0, 1.0, 1.0);
+    const vec4 MaterialSpecular = vec4(0.2, 0.2, 0.2, 1.0);
+    const float MaterialShininess = 100.0;
+
+    vec3 N = normalize(Normal);
+
+    // In the lighting model we are using here (Blinn-Phong with light at
+    // infinity, viewer at infinity), the light position/direction and the
+    // half vector is constant for the all the fragments.
+    vec3 L = normalize(LightSourcePosition.xyz);
+    vec3 H = normalize(LightSourceHalfVector);
+
+    // Calculate the diffuse color according to Lambertian reflectance
+    vec4 diffuse = MaterialDiffuse * LightSourceDiffuse * max(dot(N, L), 0.0);
+
+    // Calculate the ambient color
+    vec4 ambient = MaterialAmbient * LightSourceAmbient;
+
+    // Calculate the specular color according to the Blinn-Phong model
+    vec4 specular = MaterialSpecular * LightSourceSpecular *
+                    pow(max(dot(N,H), 0.0), MaterialShininess);
+
+    // Calculate the final color
+    gl_FragColor = ambient + specular + diffuse;
+}
diff --git a/data/shaders/bump-poly.vert b/data/shaders/bump-poly.vert
new file mode 100644
index 0000000..0207c37
--- /dev/null
+++ b/data/shaders/bump-poly.vert
@@ -0,0 +1,16 @@
+attribute vec3 position;
+attribute vec3 normal;
+
+uniform mat4 ModelViewProjectionMatrix;
+uniform mat4 NormalMatrix;
+
+varying vec3 Normal;
+
+void main(void)
+{
+    // Transform the normal to eye coordinates
+    Normal = normalize(vec3(NormalMatrix * vec4(normal, 1.0)));
+
+    // Transform the position to clip coordinates
+    gl_Position = ModelViewProjectionMatrix * vec4(position, 1.0);
+}
diff --git a/data/shaders/conditionals-step-conditional.all b/data/shaders/conditionals-step-conditional.all
new file mode 100644
index 0000000..e8ca730
--- /dev/null
+++ b/data/shaders/conditionals-step-conditional.all
@@ -0,0 +1,4 @@
+    if (d >= 0.5)
+        d = fract(2.0 * d);
+    else
+        d = fract(3.0 * d);
diff --git a/data/shaders/conditionals-step-simple.all b/data/shaders/conditionals-step-simple.all
new file mode 100644
index 0000000..9b64c37
--- /dev/null
+++ b/data/shaders/conditionals-step-simple.all
@@ -0,0 +1 @@
+    d = fract(3.0 * d);
diff --git a/data/shaders/conditionals.frag b/data/shaders/conditionals.frag
new file mode 100644
index 0000000..3bd2507
--- /dev/null
+++ b/data/shaders/conditionals.frag
@@ -0,0 +1,11 @@
+varying vec4 dummy;
+
+void main(void)
+{
+    float d = fract(gl_FragCoord.x * gl_FragCoord.y * 0.0001);
+
+$MAIN$
+
+    gl_FragColor = vec4(d, d, d, 1.0);
+}
+
diff --git a/data/shaders/conditionals.vert b/data/shaders/conditionals.vert
new file mode 100644
index 0000000..83eb9cc
--- /dev/null
+++ b/data/shaders/conditionals.vert
@@ -0,0 +1,25 @@
+attribute vec3 position;
+
+uniform mat4 ModelViewProjectionMatrix;
+
+// Removing this varying causes an inexplicable performance regression
+// with r600g... Keeping it for now.
+varying vec4 dummy;
+
+void main(void)
+{
+    dummy = vec4(1.0);
+
+    float d = fract(position.x);
+
+$MAIN$
+
+    vec4 pos = vec4(position.x,
+                    position.y + 0.1 * d * fract(position.x),
+                    position.z, 1.0);
+
+    // Transform the position to clip coordinates
+    gl_Position = ModelViewProjectionMatrix * pos;
+}
+
+
diff --git a/data/shaders/depth.frag b/data/shaders/depth.frag
new file mode 100644
index 0000000..e2a5256
--- /dev/null
+++ b/data/shaders/depth.frag
@@ -0,0 +1,6 @@
+varying vec3 Normal;
+
+void main()
+{
+    gl_FragColor = vec4(Normal, 1.0);
+}
diff --git a/data/shaders/depth.vert b/data/shaders/depth.vert
new file mode 100644
index 0000000..f424032
--- /dev/null
+++ b/data/shaders/depth.vert
@@ -0,0 +1,12 @@
+attribute vec3 position;
+attribute vec3 normal;
+
+uniform mat4 ModelViewProjectionMatrix;
+
+varying vec3 Normal;
+
+void main(void)
+{
+    Normal = normal;
+    gl_Position = ModelViewProjectionMatrix * vec4(position, 1.0);
+}
diff --git a/data/shaders/desktop-blur.frag b/data/shaders/desktop-blur.frag
new file mode 100644
index 0000000..1b29ff5
--- /dev/null
+++ b/data/shaders/desktop-blur.frag
@@ -0,0 +1,13 @@
+uniform sampler2D Texture0;
+
+varying vec2 TextureCoord;
+
+void main(void)
+{
+    vec4 result;
+
+    $CONVOLUTION$
+
+    gl_FragColor = vec4(result.xyz, 1.0);
+}
+
diff --git a/data/shaders/desktop.frag b/data/shaders/desktop.frag
new file mode 100644
index 0000000..f7ed2fd
--- /dev/null
+++ b/data/shaders/desktop.frag
@@ -0,0 +1,10 @@
+uniform sampler2D MaterialTexture0;
+
+varying vec2 TextureCoord;
+
+void main(void)
+{
+    vec4 texel = texture2D(MaterialTexture0, TextureCoord);
+    gl_FragColor = texel;
+}
+
diff --git a/data/shaders/desktop.vert b/data/shaders/desktop.vert
new file mode 100644
index 0000000..1ebaaab
--- /dev/null
+++ b/data/shaders/desktop.vert
@@ -0,0 +1,11 @@
+attribute vec2 position;
+attribute vec2 texcoord;
+
+varying vec2 TextureCoord;
+
+void main(void)
+{
+    gl_Position = vec4(position, 0.0, 1.0);
+
+    TextureCoord = texcoord;
+}
diff --git a/data/shaders/effect-2d-convolution.frag b/data/shaders/effect-2d-convolution.frag
new file mode 100644
index 0000000..63763e8
--- /dev/null
+++ b/data/shaders/effect-2d-convolution.frag
@@ -0,0 +1,12 @@
+uniform sampler2D Texture0;
+varying vec2 TextureCoord;
+
+void main(void)
+{
+    vec4 result;
+
+    $CONVOLUTION$
+
+    gl_FragColor = vec4(result.xyz, 1.0);
+}
+
diff --git a/data/shaders/effect-2d.vert b/data/shaders/effect-2d.vert
new file mode 100644
index 0000000..d0aa488
--- /dev/null
+++ b/data/shaders/effect-2d.vert
@@ -0,0 +1,10 @@
+attribute vec3 position;
+
+varying vec2 TextureCoord;
+
+void main(void)
+{
+    gl_Position = vec4(position, 1.0);
+
+    TextureCoord = position.xy * 0.5 + 0.5;
+}
diff --git a/data/shaders/function-call.all b/data/shaders/function-call.all
new file mode 100644
index 0000000..9bb02a4
--- /dev/null
+++ b/data/shaders/function-call.all
@@ -0,0 +1 @@
+    d = process(d);
diff --git a/data/shaders/function-step-low.all b/data/shaders/function-step-low.all
new file mode 100644
index 0000000..9b64c37
--- /dev/null
+++ b/data/shaders/function-step-low.all
@@ -0,0 +1 @@
+    d = fract(3.0 * d);
diff --git a/data/shaders/function-step-medium.all b/data/shaders/function-step-medium.all
new file mode 100644
index 0000000..90b900b
--- /dev/null
+++ b/data/shaders/function-step-medium.all
@@ -0,0 +1,2 @@
+    d = fract(3.0 * d) * fract(3.0 * d);
+    d = fract(sqrt(d));
diff --git a/data/shaders/function.frag b/data/shaders/function.frag
new file mode 100644
index 0000000..3e3c74f
--- /dev/null
+++ b/data/shaders/function.frag
@@ -0,0 +1,16 @@
+varying vec4 dummy;
+
+float process(float d)
+{
+$PROCESS$
+    return d;
+}
+
+void main(void)
+{
+    float d = fract(gl_FragCoord.x * gl_FragCoord.y * 0.0001);
+
+$MAIN$
+
+    gl_FragColor = vec4(d, d, d, 1.0);
+}
diff --git a/data/shaders/function.vert b/data/shaders/function.vert
new file mode 100644
index 0000000..5fa357e
--- /dev/null
+++ b/data/shaders/function.vert
@@ -0,0 +1,30 @@
+attribute vec3 position;
+
+uniform mat4 ModelViewProjectionMatrix;
+
+// Removing this varying causes an inexplicable performance regression
+// with r600g... Keeping it for now.
+varying vec4 dummy;
+
+float process(float d)
+{
+    $PROCESS$
+    return d;
+}
+
+void main(void)
+{
+    dummy = vec4(1.0);
+
+    float d = fract(position.x);
+
+    $MAIN$
+
+    vec4 pos = vec4(position.x,
+                    position.y + 0.1 * d * fract(position.x),
+                    position.z, 1.0);
+
+    // Transform the position to clip coordinates
+    gl_Position = ModelViewProjectionMatrix * pos;
+}
+
diff --git a/data/shaders/gradient.frag b/data/shaders/gradient.frag
new file mode 100644
index 0000000..e93bf00
--- /dev/null
+++ b/data/shaders/gradient.frag
@@ -0,0 +1,10 @@
+uniform vec3 color1;
+uniform vec3 color2;
+
+varying vec2 uv;
+
+void main()
+{
+    vec3 color = mix(color1, color2, uv.x * uv.y);
+    gl_FragColor = vec4(color, 1.0);
+}
diff --git a/data/shaders/gradient.vert b/data/shaders/gradient.vert
new file mode 100644
index 0000000..f9c8a88
--- /dev/null
+++ b/data/shaders/gradient.vert
@@ -0,0 +1,10 @@
+attribute vec2 position;
+attribute vec2 uvIn;
+
+varying vec2 uv;
+
+void main()
+{
+    uv = uvIn;
+    gl_Position = vec4(position, 1.0, 1.0);
+}
diff --git a/data/shaders/ideas-lamp-lit.frag b/data/shaders/ideas-lamp-lit.frag
new file mode 100644
index 0000000..8664241
--- /dev/null
+++ b/data/shaders/ideas-lamp-lit.frag
@@ -0,0 +1,68 @@
+struct LightSourceParameters
+{
+    vec4 ambient;
+    vec4 diffuse;
+    vec4 specular;
+    vec4 position;
+};
+LightSourceParameters lightSource[3];
+uniform mat4 modelview;
+uniform vec4 light0Position;
+uniform vec4 light1Position;
+uniform vec4 light2Position;
+varying vec3 vertex_normal;
+varying vec4 vertex_position;
+varying vec3 eye_direction;
+
+vec3 unitvec(vec4 v1, vec4 v2)
+{
+    if (v1.w == 0.0 && v2.w == 0.0)
+        return vec3(v2 - v1);
+    if (v1.w == 0.0)
+        return vec3(-v1);
+    if (v2.w == 0.0)
+        return vec3(v2);
+    return v2.xyz/v2.w - v1.xyz/v1.w;
+}
+
+void main()
+{
+    lightSource[0] = LightSourceParameters(
+        vec4(0.0, 0.0, 0.0, 1.0),
+        vec4(1.0, 1.0, 1.0, 1.0),
+        vec4(1.0, 1.0, 1.0, 1.0),
+        vec4(0.0, 1.0, 0.0, 0.0)
+    );
+    lightSource[1] = LightSourceParameters(
+        vec4(0.0, 0.0, 0.0, 1.0),
+        vec4(0.3, 0.3, 0.5, 1.0),
+        vec4(0.3, 0.3, 0.5, 1.0),
+        vec4(-1.0, 0.0, 0.0, 0.0)
+    );
+    lightSource[2] = LightSourceParameters(
+        vec4(0.2, 0.2, 0.2, 1.0),
+        vec4(0.2, 0.2, 0.2, 1.0),
+        vec4(0.2, 0.2, 0.2, 1.0),
+        vec4(0.0, -1.0, 0.0, 0.0)
+    );
+    vec4 matAmbient = vec4(0.0, 0.0, 0.0, 1.0);
+    vec4 matDiffuse = vec4(1.0, 0.2, 0.2, 1.0);
+    vec4 matSpecular = vec4(0.5, 0.5, 0.5, 1.0);
+    float matShininess = 20.0;
+    vec4 diffuseSum = vec4(0.0, 0.0, 0.0, 0.0);
+    vec4 specularSum = vec4(0.0, 0.0, 0.0, 0.0);
+    vec4 ambientSum = vec4(0.0, 0.0, 0.0, 0.0);
+    vec3 normalized_normal = normalize(vertex_normal);
+    lightSource[0].position = light0Position;
+    lightSource[1].position = light1Position;
+    lightSource[2].position = light2Position;
+    for (int light = 0; light < 3; light++) {
+        vec4 light_position = lightSource[light].position;
+        vec3 light_direction = normalize(unitvec(vertex_position, light_position));
+        vec3 reflection = reflect(-light_direction, normalized_normal);
+        specularSum += pow(max(0.0, dot(reflection, eye_direction)), matShininess) * lightSource[light].specular;
+        diffuseSum += max(0.0, dot(normalized_normal, light_direction)) * lightSource[light].diffuse;
+        ambientSum += lightSource[light].ambient;
+    }
+    gl_FragColor = (matSpecular * specularSum) + (matAmbient * ambientSum) + (matDiffuse * diffuseSum);
+}
diff --git a/data/shaders/ideas-lamp-lit.vert b/data/shaders/ideas-lamp-lit.vert
new file mode 100644
index 0000000..8098ce4
--- /dev/null
+++ b/data/shaders/ideas-lamp-lit.vert
@@ -0,0 +1,28 @@
+uniform mat4 projection;
+uniform mat4 modelview;
+uniform mat3 normalMatrix;
+varying vec3 vertex_normal;
+varying vec4 vertex_position;
+varying vec3 eye_direction;
+attribute vec3 vertex;
+attribute vec3 normal;
+
+vec3 unitvec(vec4 v1, vec4 v2)
+{
+    if (v1.w == 0.0 && v2.w == 0.0)
+        return vec3(v2 - v1);
+    if (v1.w == 0.0)
+        return vec3(-v1);
+    if (v2.w == 0.0)
+        return vec3(v2);
+    return v2.xyz/v2.w - v1.xyz/v1.w;
+}
+
+void main()
+{
+    vec4 curVertex = vec4(vertex.x, vertex.y, vertex.z, 1.0);
+    gl_Position = projection * modelview * curVertex;
+    vertex_normal = normalMatrix * normal;
+    vertex_position = modelview * curVertex;
+    eye_direction = normalize(unitvec(vertex_position, vec4(0.0, 0.0, 0.0, 1.0)));
+}
diff --git a/data/shaders/ideas-lamp-unlit.frag b/data/shaders/ideas-lamp-unlit.frag
new file mode 100644
index 0000000..b290d9d
--- /dev/null
+++ b/data/shaders/ideas-lamp-unlit.frag
@@ -0,0 +1,6 @@
+varying vec4 color;
+
+void main()
+{
+    gl_FragColor = color;
+}
diff --git a/data/shaders/ideas-lamp-unlit.vert b/data/shaders/ideas-lamp-unlit.vert
new file mode 100644
index 0000000..e8d6044
--- /dev/null
+++ b/data/shaders/ideas-lamp-unlit.vert
@@ -0,0 +1,11 @@
+uniform mat4 projection;
+uniform mat4 modelview;
+attribute vec3 vertex;
+varying vec4 color;
+
+void main()
+{
+    vec4 curVertex = vec4(vertex.x, vertex.y, vertex.z, 1.0);
+    gl_Position = projection * modelview * curVertex;
+    color = vec4(1.0, 1.0, 1.0, 1.0);
+}
diff --git a/data/shaders/ideas-logo-flat.frag b/data/shaders/ideas-logo-flat.frag
new file mode 100644
index 0000000..509e58d
--- /dev/null
+++ b/data/shaders/ideas-logo-flat.frag
@@ -0,0 +1,6 @@
+uniform vec4 logoColor;
+
+void main()
+{
+    gl_FragColor = logoColor;
+}
diff --git a/data/shaders/ideas-logo-flat.vert b/data/shaders/ideas-logo-flat.vert
new file mode 100644
index 0000000..664cc73
--- /dev/null
+++ b/data/shaders/ideas-logo-flat.vert
@@ -0,0 +1,9 @@
+uniform mat4 projection;
+uniform mat4 modelview;
+attribute vec3 vertex;
+
+void main()
+{
+    vec4 curVertex = vec4(vertex.x, vertex.y, vertex.z, 1.0);
+    gl_Position = projection * modelview * curVertex;
+}
diff --git a/data/shaders/ideas-logo-shadow.frag b/data/shaders/ideas-logo-shadow.frag
new file mode 100644
index 0000000..6b9e83a
--- /dev/null
+++ b/data/shaders/ideas-logo-shadow.frag
@@ -0,0 +1,10 @@
+uniform sampler2D tex;
+
+void main()
+{
+    vec2 curPos = gl_FragCoord.xy / 32.0;
+    vec4 color = texture2D(tex, curPos);
+    if (color.w < 0.5)
+        discard;
+    gl_FragColor = color;
+}
diff --git a/data/shaders/ideas-logo-shadow.vert b/data/shaders/ideas-logo-shadow.vert
new file mode 100644
index 0000000..664cc73
--- /dev/null
+++ b/data/shaders/ideas-logo-shadow.vert
@@ -0,0 +1,9 @@
+uniform mat4 projection;
+uniform mat4 modelview;
+attribute vec3 vertex;
+
+void main()
+{
+    vec4 curVertex = vec4(vertex.x, vertex.y, vertex.z, 1.0);
+    gl_Position = projection * modelview * curVertex;
+}
diff --git a/data/shaders/ideas-logo.frag b/data/shaders/ideas-logo.frag
new file mode 100644
index 0000000..61b1d4f
--- /dev/null
+++ b/data/shaders/ideas-logo.frag
@@ -0,0 +1,35 @@
+uniform vec4 light0Position;
+varying vec3 vertex_normal;
+varying vec4 vertex_position;
+varying vec3 eye_direction;
+
+vec3 unitvec(vec4 v1, vec4 v2)
+{
+    if (v1.w == 0.0 && v2.w == 0.0)
+        return vec3(v2 - v1);
+    if (v1.w == 0.0)
+        return vec3(-v1);
+    if (v2.w == 0.0)
+        return vec3(v2);
+    return v2.xyz/v2.w - v1.xyz/v1.w;
+}
+
+void main()
+{
+    vec4 lightAmbient = vec4(0.0, 0.0, 0.0, 1.0);
+    vec4 lightDiffuse = vec4(1.0, 1.0, 1.0, 1.0);
+    vec4 lightSpecular = vec4(1.0, 1.0, 1.0, 1.0);
+    vec4 matAmbient = vec4(0.1, 0.1, 0.1, 1.0);
+    vec4 matDiffuse = vec4(0.5, 0.4, 0.7, 1.0);
+    vec4 matSpecular = vec4(1.0, 1.0, 1.0, 1.0);
+    float matShininess = 30.0;
+    vec3 light_direction = normalize(unitvec(vertex_position, light0Position));
+    vec3 normalized_normal = normalize(vertex_normal);
+    vec3 reflection = reflect(-light_direction, normalized_normal);
+    float specularTerm = pow(max(0.0, dot(reflection, eye_direction)), matShininess);
+    float diffuseTerm = max(0.0, dot(normalized_normal, light_direction));
+    vec4 specular = (lightSpecular * matSpecular);
+    vec4 ambient = (lightAmbient * matAmbient);
+    vec4 diffuse = (lightDiffuse * matDiffuse);
+    gl_FragColor = (specular * specularTerm) + ambient + (diffuse * diffuseTerm);
+}
diff --git a/data/shaders/ideas-logo.vert b/data/shaders/ideas-logo.vert
new file mode 100644
index 0000000..8098ce4
--- /dev/null
+++ b/data/shaders/ideas-logo.vert
@@ -0,0 +1,28 @@
+uniform mat4 projection;
+uniform mat4 modelview;
+uniform mat3 normalMatrix;
+varying vec3 vertex_normal;
+varying vec4 vertex_position;
+varying vec3 eye_direction;
+attribute vec3 vertex;
+attribute vec3 normal;
+
+vec3 unitvec(vec4 v1, vec4 v2)
+{
+    if (v1.w == 0.0 && v2.w == 0.0)
+        return vec3(v2 - v1);
+    if (v1.w == 0.0)
+        return vec3(-v1);
+    if (v2.w == 0.0)
+        return vec3(v2);
+    return v2.xyz/v2.w - v1.xyz/v1.w;
+}
+
+void main()
+{
+    vec4 curVertex = vec4(vertex.x, vertex.y, vertex.z, 1.0);
+    gl_Position = projection * modelview * curVertex;
+    vertex_normal = normalMatrix * normal;
+    vertex_position = modelview * curVertex;
+    eye_direction = normalize(unitvec(vertex_position, vec4(0.0, 0.0, 0.0, 1.0)));
+}
diff --git a/data/shaders/ideas-paper.frag b/data/shaders/ideas-paper.frag
new file mode 100644
index 0000000..b290d9d
--- /dev/null
+++ b/data/shaders/ideas-paper.frag
@@ -0,0 +1,6 @@
+varying vec4 color;
+
+void main()
+{
+    gl_FragColor = color;
+}
diff --git a/data/shaders/ideas-paper.vert b/data/shaders/ideas-paper.vert
new file mode 100644
index 0000000..74571c6
--- /dev/null
+++ b/data/shaders/ideas-paper.vert
@@ -0,0 +1,22 @@
+uniform mat4 projection;
+uniform mat4 modelview;
+uniform vec3 lightPosition;
+uniform vec3 logoDirection;
+uniform float currentTime;
+attribute vec3 vertex;
+varying vec4 color;
+
+void main()
+{
+    vec4 curVertex = vec4(vertex.x, vertex.y, vertex.z, 1.0);
+    gl_Position = projection * modelview * curVertex;
+    float referenceTime = 15.0;
+    vec3 lightDirection = normalize(lightPosition - vertex);    
+    float c = max(dot(lightDirection, logoDirection), 0.0);
+    c = c * c * c * lightDirection.y;
+    if ((currentTime > referenceTime - 5.0) && (currentTime < referenceTime - 3.0))
+    {
+        c *= 1.0 - (currentTime - (referenceTime - 5.0)) * 0.5;
+    }
+    color = vec4(c, c, (c * 0.78125), 1.0);
+}
diff --git a/data/shaders/ideas-table.frag b/data/shaders/ideas-table.frag
new file mode 100644
index 0000000..b290d9d
--- /dev/null
+++ b/data/shaders/ideas-table.frag
@@ -0,0 +1,6 @@
+varying vec4 color;
+
+void main()
+{
+    gl_FragColor = color;
+}
diff --git a/data/shaders/ideas-table.vert b/data/shaders/ideas-table.vert
new file mode 100644
index 0000000..0994d64
--- /dev/null
+++ b/data/shaders/ideas-table.vert
@@ -0,0 +1,22 @@
+uniform mat4 projection;
+uniform mat4 modelview;
+uniform vec3 lightPosition;
+uniform vec3 logoDirection;
+uniform float currentTime;
+attribute vec3 vertex;
+varying vec4 color;
+
+void main()
+{
+    vec4 curVertex = vec4(vertex.x, vertex.y, vertex.z, 1.0);
+    gl_Position = projection * modelview * curVertex;
+    float referenceTime = 15.0;
+    vec3 lightDirection = normalize(lightPosition - vertex);    
+    float c = max(dot(lightDirection, logoDirection), 0.0);
+    c = c * c * c * lightDirection.y;
+    if ((currentTime > referenceTime - 5.0) && (currentTime < referenceTime - 3.0))
+    {
+        c *= 1.0 - (currentTime - (referenceTime - 5.0)) * 0.5;
+    }
+    color = vec4(c, c, c, 1.0);
+}
diff --git a/data/shaders/ideas-text.frag b/data/shaders/ideas-text.frag
new file mode 100644
index 0000000..b290d9d
--- /dev/null
+++ b/data/shaders/ideas-text.frag
@@ -0,0 +1,6 @@
+varying vec4 color;
+
+void main()
+{
+    gl_FragColor = color;
+}
diff --git a/data/shaders/ideas-text.vert b/data/shaders/ideas-text.vert
new file mode 100644
index 0000000..38a3126
--- /dev/null
+++ b/data/shaders/ideas-text.vert
@@ -0,0 +1,18 @@
+uniform mat4 projection;
+uniform mat4 modelview;
+uniform float currentTime;
+attribute vec2 vertex;
+varying vec4 color;
+
+void main()
+{
+    vec4 curVertex = vec4(vertex.x, vertex.y, 0.0, 1.0);
+    gl_Position = projection * modelview * curVertex;
+    float referenceTime = 15.0;
+    float c = 0.0;
+    if (currentTime > referenceTime * 1.0 - 5.0)
+    {
+        c = (currentTime - (referenceTime * 1.0 - 5.0)) / 2.0;
+    }
+    color = vec4(c, c, c, 1.0);
+}
diff --git a/data/shaders/ideas-under-table.frag b/data/shaders/ideas-under-table.frag
new file mode 100644
index 0000000..b290d9d
--- /dev/null
+++ b/data/shaders/ideas-under-table.frag
@@ -0,0 +1,6 @@
+varying vec4 color;
+
+void main()
+{
+    gl_FragColor = color;
+}
diff --git a/data/shaders/ideas-under-table.vert b/data/shaders/ideas-under-table.vert
new file mode 100644
index 0000000..cd19539
--- /dev/null
+++ b/data/shaders/ideas-under-table.vert
@@ -0,0 +1,11 @@
+uniform mat4 projection;
+uniform mat4 modelview;
+attribute vec3 vertex;
+varying vec4 color;
+
+void main()
+{
+    vec4 curVertex = vec4(vertex.x, vertex.y, vertex.z, 1.0);
+    gl_Position = projection * modelview * curVertex;
+    color = vec4(0.0, 0.0, 0.0, 1.0);
+}
diff --git a/data/shaders/jellyfish.frag b/data/shaders/jellyfish.frag
new file mode 100644
index 0000000..62c9960
--- /dev/null
+++ b/data/shaders/jellyfish.frag
@@ -0,0 +1,21 @@
+#ifdef GL_ES
+precision highp float;
+#endif
+  
+uniform sampler2D uSampler;
+uniform sampler2D uSampler1;
+uniform float uCurrentTime;
+  
+varying vec2 vTextureCoord;
+varying vec4 vWorld;
+varying vec3 vDiffuse;
+varying vec3 vAmbient;
+varying vec3 vFresnel;
+
+void main(void)
+{
+    vec4 caustics = texture2D(uSampler1, vec2(vWorld.x / 24.0 + uCurrentTime / 20.0, (vWorld.z - vWorld.y)/48.0 + uCurrentTime / 40.0));
+    vec4 colorMap = texture2D(uSampler, vTextureCoord);
+    float transparency = colorMap.a + pow(vFresnel.r, 2.0) - 0.3;
+    gl_FragColor = vec4(((vAmbient + vDiffuse + caustics.rgb) * colorMap.rgb), transparency);
+}
diff --git a/data/shaders/jellyfish.vert b/data/shaders/jellyfish.vert
new file mode 100644
index 0000000..c125370
--- /dev/null
+++ b/data/shaders/jellyfish.vert
@@ -0,0 +1,56 @@
+attribute vec3 aVertexPosition;
+attribute vec3 aVertexNormal;
+attribute vec3 aVertexColor;
+attribute vec3 aTextureCoord;
+
+uniform mat4 uWorld;
+uniform mat4 uWorldViewProj;
+uniform mat4 uWorldInvTranspose;
+uniform vec3 uLightPos;
+uniform float uLightRadius;
+uniform vec4 uLightCol;
+uniform vec4 uAmbientCol;
+uniform vec4 uFresnelCol;
+uniform float uFresnelPower;
+uniform float uCurrentTime;
+
+varying vec2 vTextureCoord;
+varying vec4 vWorld;
+varying vec3 vDiffuse;
+varying vec3 vAmbient;
+varying vec3 vFresnel;
+  
+void main(void)
+{ 
+    //Vertex Animation
+    float speed = uCurrentTime / 15.0;
+    float offset = smoothstep(0.0, 1.0, max(0.0, -aVertexPosition.y-0.8) / 10.0);
+    vec3 pos = aVertexPosition +
+        aVertexColor / 12.0 *
+        sin(speed * 15.0 + aVertexPosition.y / 2.0) * (1.0 - offset);
+    pos = pos + aVertexColor / 8.0 *
+        sin(speed * 30.0 + aVertexPosition.y / 0.5) * (1.0 - offset);
+    vec4 pos4 = vec4(pos, 1.0);
+    gl_Position = uWorldViewProj * pos4; 
+
+    vWorld = uWorld * pos4;
+    vec3 vVertexNormal = normalize((uWorldInvTranspose * vec4(aVertexNormal, 1.0)).xyz);
+
+    //diffuse
+    vec3 lightDir = normalize(uLightPos - vWorld.xyz);
+    float diffuseProduct = max(dot(normalize(vVertexNormal.xyz), lightDir), 0.0);
+    float lightFalloff = pow(max(1.0-(distance(uLightPos, vWorld.xyz)/uLightRadius), 0.0),2.0);
+    vDiffuse = uLightCol.rgb * vec3(diffuseProduct * lightFalloff * uLightCol.a);
+
+    //ambient (top)
+    vAmbient = uAmbientCol.rgb * vec3(uAmbientCol.a) * vVertexNormal.y;
+
+    //fresnel
+    vec4 worldPos = uWorld * pos4;
+    vec3 vWorldEyeVec = normalize(worldPos.xyz/worldPos.w); 
+    float fresnelProduct = pow(1.0 - max(abs(dot(vVertexNormal, -vWorldEyeVec)), 0.0), uFresnelPower);
+    vFresnel = uFresnelCol.rgb * vec3(uFresnelCol.a * fresnelProduct);
+
+    // texcoord
+    vTextureCoord = aTextureCoord.xy;
+}
diff --git a/data/shaders/light-advanced.frag b/data/shaders/light-advanced.frag
new file mode 100644
index 0000000..054c7e0
--- /dev/null
+++ b/data/shaders/light-advanced.frag
@@ -0,0 +1,33 @@
+varying vec3 Normal;
+
+void main(void)
+{
+    const vec4 LightSourceAmbient = vec4(0.1, 0.1, 0.1, 1.0);
+    const vec4 LightSourceDiffuse = vec4(0.8, 0.8, 0.8, 1.0);
+    const vec4 LightSourceSpecular = vec4(0.8, 0.8, 0.8, 1.0);
+    const vec4 MaterialAmbient = vec4(1.0, 1.0, 1.0, 1.0);
+    const vec4 MaterialDiffuse = vec4(0.0, 0.0, 1.0, 1.0);
+    const vec4 MaterialSpecular = vec4(1.0, 1.0, 1.0, 1.0);
+    const float MaterialShininess = 100.0;
+
+    vec3 N = normalize(Normal);
+
+    // In the lighting model we are using here (Blinn-Phong with light at
+    // infinity, viewer at infinity), the light position/direction and the
+    // half vector is constant for the all the fragments.
+    vec3 L = normalize(LightSourcePosition.xyz);
+    vec3 H = normalize(LightSourceHalfVector);
+
+    // Calculate the diffuse color according to Lambertian reflectance
+    vec4 diffuse = MaterialDiffuse * LightSourceDiffuse * max(dot(N, L), 0.0);
+
+    // Calculate the ambient color
+    vec4 ambient = MaterialAmbient * LightSourceAmbient;
+
+    // Calculate the specular color according to the Blinn-Phong model
+    vec4 specular = MaterialSpecular * LightSourceSpecular *
+                    pow(max(dot(N,H), 0.0), MaterialShininess);
+
+    // Calculate the final color
+    gl_FragColor = vec4((ambient + specular + diffuse).xyz, 1.0);
+}
diff --git a/data/shaders/light-advanced.vert b/data/shaders/light-advanced.vert
new file mode 100644
index 0000000..0207c37
--- /dev/null
+++ b/data/shaders/light-advanced.vert
@@ -0,0 +1,16 @@
+attribute vec3 position;
+attribute vec3 normal;
+
+uniform mat4 ModelViewProjectionMatrix;
+uniform mat4 NormalMatrix;
+
+varying vec3 Normal;
+
+void main(void)
+{
+    // Transform the normal to eye coordinates
+    Normal = normalize(vec3(NormalMatrix * vec4(normal, 1.0)));
+
+    // Transform the position to clip coordinates
+    gl_Position = ModelViewProjectionMatrix * vec4(position, 1.0);
+}
diff --git a/data/shaders/light-basic-tex-bilinear.frag b/data/shaders/light-basic-tex-bilinear.frag
new file mode 100644
index 0000000..ffeba8a
--- /dev/null
+++ b/data/shaders/light-basic-tex-bilinear.frag
@@ -0,0 +1,31 @@
+uniform sampler2D MaterialTexture0;
+
+varying vec4 Color;
+varying vec2 TextureCoord;
+
+const vec2 TexelSize = vec2(1.0 / TextureSize.x, 1.0 / TextureSize.y); 
+
+/*
+ * See http://www.gamerendering.com/2008/10/05/bilinear-interpolation/
+ * for a more thorough explanation of how this works.
+ */
+vec4 texture2DBilinear(sampler2D sampler, vec2 uv)
+{
+    // Get the needed texture samples
+    vec4 tl = texture2D(sampler, uv);
+    vec4 tr = texture2D(sampler, uv + vec2(TexelSize.x, 0));
+    vec4 bl = texture2D(sampler, uv + vec2(0, TexelSize.y));
+    vec4 br = texture2D(sampler, uv + vec2(TexelSize.x , TexelSize.y));
+
+    // Mix the samples according to the GL specification
+    vec2 f = fract(uv * TextureSize);
+    vec4 tA = mix(tl, tr, f.x);
+    vec4 tB = mix(bl, br, f.x);
+    return mix(tA, tB, f.y);
+}
+
+void main(void)
+{
+    vec4 texel = texture2DBilinear(MaterialTexture0, TextureCoord);
+    gl_FragColor = texel * Color;
+}
diff --git a/data/shaders/light-basic-tex.frag b/data/shaders/light-basic-tex.frag
new file mode 100644
index 0000000..f87ced1
--- /dev/null
+++ b/data/shaders/light-basic-tex.frag
@@ -0,0 +1,11 @@
+uniform sampler2D MaterialTexture0;
+
+varying vec4 Color;
+varying vec2 TextureCoord;
+
+void main(void)
+{
+    vec4 texel = texture2D(MaterialTexture0, TextureCoord);
+    gl_FragColor = texel * Color;
+}
+
diff --git a/data/shaders/light-basic-texgen.vert b/data/shaders/light-basic-texgen.vert
new file mode 100644
index 0000000..6198a64
--- /dev/null
+++ b/data/shaders/light-basic-texgen.vert
@@ -0,0 +1,30 @@
+attribute vec3 position;
+attribute vec3 normal;
+
+uniform mat4 ModelViewProjectionMatrix;
+uniform mat4 NormalMatrix;
+uniform vec3 CenterPoint;
+
+varying vec4 Color;
+varying vec2 TextureCoord;
+
+void main(void)
+{
+    // Transform the normal to eye coordinates
+    vec3 N = normalize(vec3(NormalMatrix * vec4(normal, 1.0)));
+
+    // The LightSourcePosition is actually its direction for directional light
+    vec3 L = normalize(LightSourcePosition.xyz);
+
+    // Multiply the diffuse value by the vertex color (which is fixed in this case)
+    // to get the actual color that we will use to draw this vertex with
+    float diffuse = max(dot(N, L), 0.0);
+    Color = vec4(diffuse * MaterialDiffuse.rgb, MaterialDiffuse.a);
+
+    // Compute the texture coordinate and as a varying
+    vec3 vnorm = normalize(position - CenterPoint);
+    TextureCoord = asin(vnorm.xy) / PI + 0.5;
+
+    // Transform the position to clip coordinates
+    gl_Position = ModelViewProjectionMatrix * vec4(position, 1.0);
+}
diff --git a/data/shaders/light-basic.frag b/data/shaders/light-basic.frag
new file mode 100644
index 0000000..a5278db
--- /dev/null
+++ b/data/shaders/light-basic.frag
@@ -0,0 +1,7 @@
+varying vec4 Color;
+varying vec2 TextureCoord;
+
+void main(void)
+{
+    gl_FragColor = Color;
+}
diff --git a/data/shaders/light-basic.vert b/data/shaders/light-basic.vert
new file mode 100644
index 0000000..609c9c0
--- /dev/null
+++ b/data/shaders/light-basic.vert
@@ -0,0 +1,29 @@
+attribute vec3 position;
+attribute vec3 normal;
+attribute vec2 texcoord;
+
+uniform mat4 ModelViewProjectionMatrix;
+uniform mat4 NormalMatrix;
+
+varying vec4 Color;
+varying vec2 TextureCoord;
+
+void main(void)
+{
+    // Transform the normal to eye coordinates
+    vec3 N = normalize(vec3(NormalMatrix * vec4(normal, 1.0)));
+
+    // The LightSourcePosition is actually its direction for directional light
+    vec3 L = normalize(LightSourcePosition.xyz);
+
+    // Multiply the diffuse value by the vertex color (which is fixed in this case)
+    // to get the actual color that we will use to draw this vertex with
+    float diffuse = max(dot(N, L), 0.0);
+    Color = vec4(diffuse * MaterialDiffuse.rgb, MaterialDiffuse.a);
+
+    // Set the texture coordinates as a varying
+    TextureCoord = texcoord;
+
+    // Transform the position to clip coordinates
+    gl_Position = ModelViewProjectionMatrix * vec4(position, 1.0);
+}
diff --git a/data/shaders/light-phong.frag b/data/shaders/light-phong.frag
new file mode 100644
index 0000000..bbc7a3d
--- /dev/null
+++ b/data/shaders/light-phong.frag
@@ -0,0 +1,29 @@
+varying vec3 vertex_normal;
+varying vec4 vertex_position;
+
+vec4
+compute_color(vec4 light_position, vec4 diffuse_light_color)
+{
+    const vec4 lightAmbient = vec4(0.1, 0.1, 0.1, 1.0);
+    const vec4 lightSpecular = vec4(0.8, 0.8, 0.8, 1.0);
+    const vec4 matAmbient = vec4(0.2, 0.2, 0.2, 1.0);
+    const vec4 matSpecular = vec4(1.0, 1.0, 1.0, 1.0);
+    const float matShininess = 100.0;
+    vec3 eye_direction = normalize(-vertex_position.xyz);
+    vec3 light_direction = normalize(light_position.xyz/light_position.w -
+                                     vertex_position.xyz/vertex_position.w);
+    vec3 normalized_normal = normalize(vertex_normal);
+    vec3 reflection = reflect(-light_direction, normalized_normal);
+    float specularTerm = pow(max(0.0, dot(reflection, eye_direction)), matShininess);
+    float diffuseTerm = max(0.0, dot(normalized_normal, light_direction));
+    vec4 specular = (lightSpecular * matSpecular);
+    vec4 ambient = (lightAmbient * matAmbient);
+    vec4 diffuse = (diffuse_light_color * MaterialDiffuse);
+    vec4 result = (specular * specularTerm) + ambient + (diffuse * diffuseTerm);
+    return result;
+}
+
+void main(void)
+{
+$DO_LIGHTS$
+}
diff --git a/data/shaders/light-phong.vert b/data/shaders/light-phong.vert
new file mode 100644
index 0000000..8a95ca7
--- /dev/null
+++ b/data/shaders/light-phong.vert
@@ -0,0 +1,23 @@
+attribute vec3 position;
+attribute vec3 normal;
+
+uniform mat4 ModelViewProjectionMatrix;
+uniform mat4 NormalMatrix;
+uniform mat4 ModelViewMatrix;
+
+varying vec3 vertex_normal;
+varying vec4 vertex_position;
+
+void main(void)
+{
+    vec4 current_position = vec4(position, 1.0);
+
+    // Transform the normal to eye coordinates
+    vertex_normal = normalize(vec3(NormalMatrix * vec4(normal, 1.0)));
+
+    // Transform the current position to eye coordinates
+    vertex_position = ModelViewMatrix * current_position;
+
+    // Transform the current position to clip coordinates
+    gl_Position = ModelViewProjectionMatrix * current_position;
+}
diff --git a/data/shaders/light-refract.frag b/data/shaders/light-refract.frag
new file mode 100644
index 0000000..d1f1397
--- /dev/null
+++ b/data/shaders/light-refract.frag
@@ -0,0 +1,45 @@
+uniform sampler2D DistanceMap;
+uniform sampler2D NormalMap;
+uniform sampler2D ImageMap;
+
+varying vec3 vertex_normal;
+varying vec4 vertex_position;
+varying vec4 MapCoord;
+
+void main()
+{
+    const vec4 lightSpecular = vec4(0.8, 0.8, 0.8, 1.0);
+    const vec4 matSpecular = vec4(1.0, 1.0, 1.0, 1.0);
+    const float matShininess = 100.0;
+    const vec2 point_five = vec2(0.5);
+    // Need the normalized eye direction and surface normal vectors to
+    // compute the transmitted vector through the "front" surface of the object.
+    vec3 eye_direction = normalize(-vertex_position.xyz);
+    vec3 normalized_normal = normalize(vertex_normal);
+    vec3 front_refraction = refract(eye_direction, normalized_normal, RefractiveIndex);
+    // Find our best distance approximation through the object so we can
+    // project the transmitted vector to the back of the object to find
+    // the exit point.
+    vec3 mc_perspective = (MapCoord.xyz / MapCoord.w) + front_refraction;
+    vec2 dcoord = mc_perspective.st * point_five + point_five;
+    vec4 distance_value = texture2D(DistanceMap, dcoord);
+    vec3 back_position = vertex_position.xyz + front_refraction * distance_value.z;
+    // Use the exit point to index the map of back-side normals, and use the
+    // back-side position and normal to find the transmitted vector out of the
+    // object.
+    vec2 normcoord = back_position.st * point_five + point_five;
+    vec3 back_normal = texture2D(NormalMap, normcoord).xyz;
+    vec3 back_refraction = refract(back_position, back_normal, 1.0);
+    // Use the transmitted vector from the exit point to determine where
+    // the vector would intersect the environment (in this case a background
+    // image.
+    vec2 imagecoord = back_refraction.st * point_five + point_five;
+    vec4 texel = texture2D(ImageMap, imagecoord);
+    // Add in specular reflection, and we have our fragment value.
+    vec3 light_direction = normalize(vertex_position.xyz/vertex_position.w -
+                                     LightSourcePosition.xyz/LightSourcePosition.w);
+    vec3 reflection = reflect(light_direction, normalized_normal);
+    float specularTerm = pow(max(0.0, dot(reflection, eye_direction)), matShininess);
+    vec4 specular = (lightSpecular * matSpecular);
+    gl_FragColor = (specular * specularTerm) + texel;
+}
diff --git a/data/shaders/light-refract.vert b/data/shaders/light-refract.vert
new file mode 100644
index 0000000..9beeb9c
--- /dev/null
+++ b/data/shaders/light-refract.vert
@@ -0,0 +1,28 @@
+attribute vec3 position;
+attribute vec3 normal;
+
+uniform mat4 ModelViewProjectionMatrix;
+uniform mat4 NormalMatrix;
+uniform mat4 ModelViewMatrix;
+uniform mat4 LightMatrix;
+
+varying vec3 vertex_normal;
+varying vec4 vertex_position;
+varying vec4 MapCoord;
+
+void main(void)
+{
+    vec4 current_position = vec4(position, 1.0);
+
+    // Transform the normal to eye coordinates
+    vertex_normal = normalize(vec3(NormalMatrix * vec4(normal, 1.0)));
+
+    // Transform the current position to eye coordinates
+    vertex_position = ModelViewMatrix * current_position;
+
+    // Transform the current position for use as texture coordinates
+    MapCoord = LightMatrix * current_position;
+
+    // Transform the current position to clip coordinates
+    gl_Position = ModelViewProjectionMatrix * current_position;
+}
diff --git a/data/shaders/loop-step-loop.all b/data/shaders/loop-step-loop.all
new file mode 100644
index 0000000..31b41f2
--- /dev/null
+++ b/data/shaders/loop-step-loop.all
@@ -0,0 +1,2 @@
+    for (int i = 0; i < $NLOOPS$; i++)
+        d = fract(3.0 * d);
diff --git a/data/shaders/loop-step-simple.all b/data/shaders/loop-step-simple.all
new file mode 100644
index 0000000..9b64c37
--- /dev/null
+++ b/data/shaders/loop-step-simple.all
@@ -0,0 +1 @@
+    d = fract(3.0 * d);
diff --git a/data/shaders/loop.frag b/data/shaders/loop.frag
new file mode 100644
index 0000000..31ae23e
--- /dev/null
+++ b/data/shaders/loop.frag
@@ -0,0 +1,12 @@
+varying vec4 dummy;
+uniform int FragmentLoops;
+
+void main(void)
+{
+    float d = fract(gl_FragCoord.x * gl_FragCoord.y * 0.0001);
+
+$MAIN$
+
+    gl_FragColor = vec4(d, d, d, 1.0);
+}
+
diff --git a/data/shaders/loop.vert b/data/shaders/loop.vert
new file mode 100644
index 0000000..853fab6
--- /dev/null
+++ b/data/shaders/loop.vert
@@ -0,0 +1,26 @@
+attribute vec3 position;
+
+uniform mat4 ModelViewProjectionMatrix;
+uniform int VertexLoops;
+
+// Removing this varying causes an inexplicable performance regression
+// with r600g... Keeping it for now.
+varying vec4 dummy;
+
+void main(void)
+{
+    dummy = vec4(1.0);
+
+    float d = fract(position.x);
+
+$MAIN$
+
+    vec4 pos = vec4(position.x,
+                    position.y + 0.1 * d * fract(position.x),
+                    position.z, 1.0);
+
+    // Transform the position to clip coordinates
+    gl_Position = ModelViewProjectionMatrix * pos;
+}
+
+
diff --git a/data/shaders/pulsar-light.vert b/data/shaders/pulsar-light.vert
new file mode 100644
index 0000000..57b96a6
--- /dev/null
+++ b/data/shaders/pulsar-light.vert
@@ -0,0 +1,31 @@
+attribute vec3 position;
+attribute vec3 normal;
+attribute vec4 vtxcolor;
+attribute vec2 texcoord;
+
+uniform mat4 ModelViewProjectionMatrix;
+uniform mat4 NormalMatrix;
+
+varying vec4 Color;
+varying vec2 TextureCoord;
+
+void main(void)
+{
+    // Transform the normal to eye coordinates
+    vec3 N = normalize(vec3(NormalMatrix * vec4(normal, 1.0)));
+
+    // The LightSourcePosition is actually its direction for directional light
+    vec3 L = normalize(LightSourcePosition.xyz);
+
+    // Multiply the diffuse value by the vertex color
+    // to get the actual color that we will use to draw this vertex with
+    float diffuse = max(abs(dot(N, L)), 0.0);
+    Color = diffuse * vtxcolor;
+
+    // Set the texture coordinates as a varying
+    TextureCoord = texcoord;
+
+    // Transform the position to clip coordinates
+    gl_Position = ModelViewProjectionMatrix * vec4(position, 1.0);
+}
+
diff --git a/data/shaders/pulsar.vert b/data/shaders/pulsar.vert
new file mode 100644
index 0000000..50b24da
--- /dev/null
+++ b/data/shaders/pulsar.vert
@@ -0,0 +1,19 @@
+attribute vec3 position;
+attribute vec4 vtxcolor;
+attribute vec2 texcoord;
+attribute vec3 normal;
+
+uniform mat4 ModelViewProjectionMatrix;
+
+varying vec4 Color;
+varying vec2 TextureCoord;
+
+void main(void)
+{
+    Color = vtxcolor;
+    TextureCoord = texcoord;
+
+    // Transform the position to clip coordinates
+    gl_Position = ModelViewProjectionMatrix * vec4(position, 1.0);
+}
+
diff --git a/data/shaders/shadow.frag b/data/shaders/shadow.frag
new file mode 100644
index 0000000..6b86ace
--- /dev/null
+++ b/data/shaders/shadow.frag
@@ -0,0 +1,17 @@
+uniform sampler2D ShadowMap;
+
+varying vec4 Color;
+varying vec4 ShadowCoord;
+
+void main()
+{
+    vec4 sc_perspective = ShadowCoord / ShadowCoord.w;
+    sc_perspective.z += 0.1505;
+    vec4 shadow_value = texture2D(ShadowMap, sc_perspective.st);
+    float light_distance = shadow_value.z;
+    float shadow = 1.0;
+    if (ShadowCoord.w > 0.0 && light_distance < sc_perspective.z) {
+        shadow = 0.5;
+    }
+    gl_FragColor = vec4(shadow * Color.rgb, 1.0);
+}
diff --git a/data/shaders/shadow.vert b/data/shaders/shadow.vert
new file mode 100644
index 0000000..a8ba2b4
--- /dev/null
+++ b/data/shaders/shadow.vert
@@ -0,0 +1,16 @@
+attribute vec2 position;
+
+uniform mat4 LightMatrix;
+uniform mat4 ModelViewProjectionMatrix;
+
+varying vec4 ShadowCoord;
+varying vec4 Color;
+
+void main()
+{
+    Color = MaterialDiffuse;
+
+    vec4 pos4 = vec4(position, 0.0, 1.0);
+    ShadowCoord = LightMatrix * pos4;
+    gl_Position = ModelViewProjectionMatrix * pos4;
+}
diff --git a/data/shaders/terrain-blur.frag b/data/shaders/terrain-blur.frag
new file mode 100644
index 0000000..a532e03
--- /dev/null
+++ b/data/shaders/terrain-blur.frag
@@ -0,0 +1,14 @@
+uniform sampler2D Texture0;
+
+varying vec2 vUv;
+
+void main(void)
+{
+    vec4 result;
+    vec2 TextureCoord = vUv;
+
+    $CONVOLUTION$
+
+    gl_FragColor = vec4(result.xyz, 1.0);
+}
+
diff --git a/data/shaders/terrain-luminance.frag b/data/shaders/terrain-luminance.frag
new file mode 100644
index 0000000..596862f
--- /dev/null
+++ b/data/shaders/terrain-luminance.frag
@@ -0,0 +1,15 @@
+uniform sampler2D tDiffuse;
+
+varying vec2 vUv;
+
+void main()
+{
+    vec4 texel = texture2D( tDiffuse, vUv );
+
+    vec3 luma = vec3( 0.299, 0.587, 0.114 );
+
+    float v = dot( texel.xyz, luma );
+
+    gl_FragColor = vec4( v, v, v, texel.w );
+}
+
diff --git a/data/shaders/terrain-noise.frag b/data/shaders/terrain-noise.frag
new file mode 100644
index 0000000..7fea5c0
--- /dev/null
+++ b/data/shaders/terrain-noise.frag
@@ -0,0 +1,124 @@
+//
+// Description : Array and textureless GLSL 3D simplex noise function.
+//      Author : Ian McEwan, Ashima Arts.
+//  Maintainer : ijm
+//     Lastmod : 20110409 (stegu)
+//     License : Copyright (C) 2011 Ashima Arts. All rights reserved.
+//               Distributed under the MIT License. See LICENSE file.
+//
+
+#ifdef GL_ES
+#define MEDIUMP mediump
+#else
+#define MEDIUMP
+#endif
+
+uniform float time;
+uniform MEDIUMP vec2 uvScale;
+varying vec2 vUv;
+
+vec4 permute(vec4 x)
+{
+    return mod(((x * 34.0) + 1.0) * x, 289.0);
+}
+
+vec4 taylorInvSqrt(vec4 r)
+{
+    return 1.79284291400159 - 0.85373472095314 * r;
+}
+
+float snoise(vec3 v)
+{
+    const vec2 C = vec2(1.0 / 6.0, 1.0 / 3.0);
+    const vec4 D = vec4(0.0, 0.5, 1.0, 2.0);
+
+    // First corner
+    vec3 i  = floor(v + dot(v, C.yyy));
+    vec3 x0 = v - i + dot(i, C.xxx);
+
+    // Other corners
+    vec3 g = step(x0.yzx, x0.xyz);
+    vec3 l = 1.0 - g;
+    vec3 i1 = min(g.xyz, l.zxy);
+    vec3 i2 = max(g.xyz, l.zxy);
+
+    vec3 x1 = x0 - i1 + 1.0 * C.xxx;
+    vec3 x2 = x0 - i2 + 2.0 * C.xxx;
+    vec3 x3 = x0 - 1. + 3.0 * C.xxx;
+
+    // Permutations
+    i = mod(i, 289.0);
+    vec4 p = permute(permute(permute(
+                    i.z + vec4(0.0, i1.z, i2.z, 1.0))
+                + i.y + vec4(0.0, i1.y, i2.y, 1.0))
+            + i.x + vec4(0.0, i1.x, i2.x, 1.0));
+
+    // Gradients
+    // (N*N points uniformly over a square, mapped onto an octahedron.)
+
+    float n_ = 1.0 / 7.0; // N=7
+
+    vec3 ns = n_ * D.wyz - D.xzx;
+
+    vec4 j = p - 49.0 * floor(p * ns.z *ns.z);  //  mod(p,N*N)
+
+    vec4 x_ = floor(j * ns.z);
+    vec4 y_ = floor(j - 7.0 * x_);    // mod(j,N)
+
+    vec4 x = x_ *ns.x + ns.yyyy;
+    vec4 y = y_ *ns.x + ns.yyyy;
+    vec4 h = 1.0 - abs(x) - abs(y);
+
+    vec4 b0 = vec4(x.xy, y.xy);
+    vec4 b1 = vec4(x.zw, y.zw);
+
+
+    vec4 s0 = floor(b0) * 2.0 + 1.0;
+    vec4 s1 = floor(b1) * 2.0 + 1.0;
+    vec4 sh = -step(h, vec4(0.0));
+
+    vec4 a0 = b0.xzyw + s0.xzyw * sh.xxyy;
+    vec4 a1 = b1.xzyw + s1.xzyw * sh.zzww;
+
+    vec3 p0 = vec3(a0.xy, h.x);
+    vec3 p1 = vec3(a0.zw, h.y);
+    vec3 p2 = vec3(a1.xy, h.z);
+    vec3 p3 = vec3(a1.zw, h.w);
+
+    // Normalise gradients
+
+    vec4 norm = taylorInvSqrt(vec4(dot(p0, p0), dot(p1, p1), dot(p2, p2), dot(p3, p3)));
+    p0 *= norm.x;
+    p1 *= norm.y;
+    p2 *= norm.z;
+    p3 *= norm.w;
+
+    // Mix final noise value
+
+    vec4 m = max(0.6 - vec4(dot(x0, x0), dot(x1, x1), dot(x2, x2), dot(x3, x3)), 0.0);
+    m = m * m;
+    return 42.0 * dot(m*m, vec4(dot(p0, x0), dot(p1, x1),
+                dot(p2, x2), dot(p3, x3)));
+}
+
+float surface3(vec3 coord)
+{
+    float n = 0.0;
+
+    n += 1.0 * abs(snoise(coord));
+    n += 0.5 * abs(snoise(coord * 2.0));
+    n += 0.25 * abs(snoise(coord * 4.0));
+    n += 0.125 * abs(snoise(coord * 8.0));
+
+    return n;
+}
+
+void main(void)
+{
+    vec3 coord = vec3(vUv.x, uvScale.y - vUv.y, -time);
+    float n = surface3(coord);
+
+    gl_FragColor = vec4(vec3(n, n, n), 1.0);
+}
+
+
diff --git a/data/shaders/terrain-normalmap.frag b/data/shaders/terrain-normalmap.frag
new file mode 100644
index 0000000..74529ae
--- /dev/null
+++ b/data/shaders/terrain-normalmap.frag
@@ -0,0 +1,15 @@
+uniform float height;
+uniform vec2 resolution;
+uniform sampler2D heightMap;
+
+varying vec2 vUv;
+
+void main()
+{
+    float val = texture2D( heightMap, vUv ).x;
+
+    float valU = texture2D( heightMap, vUv + vec2( 1.0 / resolution.x, 0.0 ) ).x;
+    float valV = texture2D( heightMap, vUv + vec2( 0.0, 1.0 / resolution.y ) ).x;
+
+    gl_FragColor = vec4( ( 0.5 * normalize( vec3( val - valU, val - valV, height  ) ) + 0.5 ), 1.0 );
+}
diff --git a/data/shaders/terrain-overlay.frag b/data/shaders/terrain-overlay.frag
new file mode 100644
index 0000000..43fd168
--- /dev/null
+++ b/data/shaders/terrain-overlay.frag
@@ -0,0 +1,10 @@
+uniform float opacity;
+uniform sampler2D tDiffuse;
+
+varying vec2 vUv;
+
+void main()
+{
+    vec4 texel = texture2D(tDiffuse, vUv);
+    gl_FragColor = opacity * texel;
+}
diff --git a/data/shaders/terrain-texture.vert b/data/shaders/terrain-texture.vert
new file mode 100644
index 0000000..021436a
--- /dev/null
+++ b/data/shaders/terrain-texture.vert
@@ -0,0 +1,18 @@
+#ifdef GL_ES
+#define MEDIUMP mediump
+#else
+#define MEDIUMP
+#endif
+
+uniform vec2 uvOffset;
+uniform MEDIUMP vec2 uvScale;
+
+attribute vec3 position;
+
+varying vec2 vUv;
+
+void main()
+{
+    vUv = uvScale * (position.xy * 0.5 + 0.5) + uvOffset;
+    gl_Position = vec4( position, 1.0);
+}
diff --git a/data/shaders/terrain.frag b/data/shaders/terrain.frag
new file mode 100644
index 0000000..23bdf19
--- /dev/null
+++ b/data/shaders/terrain.frag
@@ -0,0 +1,112 @@
+uniform vec3 uAmbientColor;
+uniform vec3 uDiffuseColor;
+uniform vec3 uSpecularColor;
+uniform float uShininess;
+uniform float uOpacity;
+uniform bool enableDiffuse1;
+uniform bool enableDiffuse2;
+uniform bool enableSpecular;
+uniform sampler2D tDiffuse1;
+uniform sampler2D tDiffuse2;
+uniform sampler2D tDetail;
+uniform sampler2D tNormal;
+uniform sampler2D tSpecular;
+uniform sampler2D tDisplacement;
+uniform float uNormalScale;
+uniform vec2 uRepeatOverlay;
+uniform vec2 uOffset;
+varying vec3 vTangent;
+varying vec3 vBinormal;
+varying vec3 vNormal;
+varying vec2 vUv;
+uniform vec3 ambientLightColor;
+uniform mat4 viewMatrix;
+
+#define MAX_POINT_LIGHTS 1
+//#define USE_FOG
+//#define FOG_EXP2
+
+#if MAX_POINT_LIGHTS > 0
+uniform vec3 pointLightColor[ MAX_POINT_LIGHTS ];
+uniform vec3 pointLightPosition[ MAX_POINT_LIGHTS ];
+uniform float pointLightDistance[ MAX_POINT_LIGHTS ];
+#endif
+
+varying vec3 vViewPosition;
+
+// CHUNK: fog_pars_fragment
+#ifdef USE_FOG
+uniform vec3 fogColor;
+#ifdef FOG_EXP2
+uniform float fogDensity;
+#else
+uniform float fogNear;
+uniform float fogFar;
+#endif
+#endif
+
+void main() {
+    gl_FragColor = vec4( vec3( 1.0 ), uOpacity );
+    vec3 specularTex = vec3( 1.0 );
+    vec2 uvOverlay = uRepeatOverlay * vUv + uOffset;
+    vec3 normalTex = texture2D( tDetail, uvOverlay ).xyz * 2.0 - 1.0;
+    normalTex.xy *= uNormalScale;
+    normalTex = normalize( normalTex );
+
+    vec4 colDiffuse1 = texture2D( tDiffuse1, uvOverlay );
+    vec4 colDiffuse2 = texture2D( tDiffuse2, uvOverlay );
+    gl_FragColor = gl_FragColor * mix ( colDiffuse1, colDiffuse2, 1.0 - texture2D( tDisplacement, vUv) );
+
+    specularTex = texture2D( tSpecular, uvOverlay ).xyz;
+
+    mat3 tbn= mat3( vTangent, vBinormal, vNormal );
+    vec3 finalNormal = tbn * normalTex;
+    vec3 normal = normalize( finalNormal );
+    vec3 viewPosition = normalize( vViewPosition );
+
+    // point lights
+#if MAX_POINT_LIGHTS > 0
+    vec3 pointDiffuse = vec3( 0.0 );
+    vec3 pointSpecular = vec3( 0.0 );
+    for ( int i = 0; i < MAX_POINT_LIGHTS; i ++ ) {
+        vec4 lPosition = viewMatrix * vec4( pointLightPosition[ i ], 1.0 );
+        vec3 lVector = lPosition.xyz + vViewPosition.xyz;
+        float lDistance = 1.0;
+        if ( pointLightDistance[ i ] > 0.0 )
+            lDistance = 1.0 - min( ( length( lVector ) / pointLightDistance[ i ] ), 1.0 );
+        lVector = normalize( lVector );
+        vec3 pointHalfVector = normalize( lVector + viewPosition );
+        float pointDistance = lDistance;
+        float pointDotNormalHalf = max( dot( normal, pointHalfVector ), 0.0 );
+        float pointDiffuseWeight = max( dot( normal, lVector ), 0.0 );
+        float pointSpecularWeight = specularTex.r * pow( pointDotNormalHalf, uShininess );
+        pointDiffuse += pointDistance * pointLightColor[ i ] * uDiffuseColor * pointDiffuseWeight;
+        pointSpecular += pointDistance * pointLightColor[ i ] * uSpecularColor * pointSpecularWeight * pointDiffuseWeight;
+    }
+#endif
+
+    // all lights contribution summation
+    vec3 totalDiffuse = vec3( 0.0 );
+    vec3 totalSpecular = vec3( 0.0 );
+
+
+#if MAX_POINT_LIGHTS > 0
+    totalDiffuse += pointDiffuse;
+    totalSpecular += pointSpecular;
+#endif
+
+    gl_FragColor.xyz = gl_FragColor.xyz * ( totalDiffuse + ambientLightColor * uAmbientColor + totalSpecular );
+
+    //CHUNK: fog_fragment
+#ifdef USE_FOG
+    float depth = gl_FragCoord.z / gl_FragCoord.w;
+#ifdef FOG_EXP2
+    const float LOG2 = 1.442695;
+    float fogFactor = exp2( - fogDensity * fogDensity * depth * depth * LOG2 );
+    fogFactor = 1.0 - clamp( fogFactor, 0.0, 1.0 );
+#else
+    float fogFactor = smoothstep( fogNear, fogFar, depth );
+#endif
+    gl_FragColor = mix( gl_FragColor, vec4( fogColor, gl_FragColor.w ), fogFactor );
+#endif
+}
diff --git a/data/shaders/terrain.vert b/data/shaders/terrain.vert
new file mode 100644
index 0000000..dd5b863
--- /dev/null
+++ b/data/shaders/terrain.vert
@@ -0,0 +1,48 @@
+// Transformation matrices
+uniform mat4 modelViewMatrix;
+uniform mat4 normalMatrix;
+uniform mat4 projectionMatrix;
+uniform mat4 viewMatrix;
+
+// Vertex attributes
+attribute vec3 position;
+attribute vec3 normal;
+attribute vec3 tangent;
+attribute vec2 uv;
+
+// Uniforms
+uniform sampler2D tNormal;
+uniform sampler2D tDisplacement;
+uniform float uDisplacementScale;
+uniform float uDisplacementBias;
+
+// Varyings
+varying vec3 vTangent;
+varying vec3 vBinormal;
+varying vec3 vNormal;
+varying vec2 vUv;
+varying vec3 vViewPosition;
+
+void main()
+{
+    vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );
+    vViewPosition = -mvPosition.xyz;
+    vNormal = normalize(vec3(normalMatrix * vec4(normal, 1.0)));
+
+    // tangent and binormal vectors
+    vTangent = normalize(vec3(normalMatrix * vec4(tangent, 1.0)));
+    vBinormal = cross( vNormal, vTangent );
+    vBinormal = normalize( vBinormal );
+
+    // texture coordinates
+    vUv = uv;
+
+    // displacement mapping
+    vec3 dv = texture2D( tDisplacement, uv ).xyz;
+    float df = uDisplacementScale * dv.x + uDisplacementBias;
+    vec4 displacedPosition = vec4(vNormal.xyz * df, 0.0 ) + mvPosition;
+    gl_Position = projectionMatrix * displacedPosition;
+
+    vec3 normalTex = texture2D(tNormal, uv).xyz * 2.0 - 1.0;
+    vNormal = vec3(normalMatrix * vec4(normalTex, 1.0));
+}
diff --git a/data/shaders/text-renderer.frag b/data/shaders/text-renderer.frag
new file mode 100644
index 0000000..c7422a8
--- /dev/null
+++ b/data/shaders/text-renderer.frag
@@ -0,0 +1,10 @@
+uniform sampler2D Texture0;
+
+varying vec2 TextureCoord;
+
+void main(void)
+{
+    vec4 texel = texture2D(Texture0, TextureCoord);
+    gl_FragColor = texel;
+}
+
diff --git a/data/shaders/text-renderer.vert b/data/shaders/text-renderer.vert
new file mode 100644
index 0000000..d6cadbd
--- /dev/null
+++ b/data/shaders/text-renderer.vert
@@ -0,0 +1,10 @@
+attribute vec2 position;
+attribute vec2 texcoord;
+
+varying vec2 TextureCoord;
+
+void main(void)
+{
+    TextureCoord = texcoord;
+    gl_Position = vec4(position, 0.0, 1.0);
+}
diff --git a/data/textures/asteroid-height-map.png b/data/textures/asteroid-height-map.png
new file mode 100644
index 0000000..0d36e0f
--- /dev/null
+++ b/data/textures/asteroid-height-map.png
diff --git a/data/textures/asteroid-normal-map-tangent.png b/data/textures/asteroid-normal-map-tangent.png
new file mode 100644
index 0000000..fe2e294
--- /dev/null
+++ b/data/textures/asteroid-normal-map-tangent.png
diff --git a/data/textures/asteroid-normal-map.png b/data/textures/asteroid-normal-map.png
new file mode 100644
index 0000000..916fc02
--- /dev/null
+++ b/data/textures/asteroid-normal-map.png
diff --git a/data/textures/crate-base.png b/data/textures/crate-base.png
new file mode 100644
index 0000000..1323e4b
--- /dev/null
+++ b/data/textures/crate-base.png
diff --git a/data/textures/desktop-shadow-corner.png b/data/textures/desktop-shadow-corner.png
new file mode 100644
index 0000000..1802fe3
--- /dev/null
+++ b/data/textures/desktop-shadow-corner.png
diff --git a/data/textures/desktop-shadow.png b/data/textures/desktop-shadow.png
new file mode 100644
index 0000000..74eab29
--- /dev/null
+++ b/data/textures/desktop-shadow.png
diff --git a/data/textures/desktop-window.png b/data/textures/desktop-window.png
new file mode 100644
index 0000000..d906c78
--- /dev/null
+++ b/data/textures/desktop-window.png
diff --git a/data/textures/effect-2d.png b/data/textures/effect-2d.png
new file mode 100644
index 0000000..732fd27
--- /dev/null
+++ b/data/textures/effect-2d.png
diff --git a/data/textures/glyph-atlas.png b/data/textures/glyph-atlas.png
new file mode 100644
index 0000000..8e64f34
--- /dev/null
+++ b/data/textures/glyph-atlas.png
diff --git a/data/textures/jellyfish-caustics-01.png b/data/textures/jellyfish-caustics-01.png
new file mode 100644
index 0000000..1106dce
--- /dev/null
+++ b/data/textures/jellyfish-caustics-01.png
diff --git a/data/textures/jellyfish-caustics-02.png b/data/textures/jellyfish-caustics-02.png
new file mode 100644
index 0000000..a80f0b5
--- /dev/null
+++ b/data/textures/jellyfish-caustics-02.png
diff --git a/data/textures/jellyfish-caustics-03.png b/data/textures/jellyfish-caustics-03.png
new file mode 100644
index 0000000..5422bc3
--- /dev/null
+++ b/data/textures/jellyfish-caustics-03.png
diff --git a/data/textures/jellyfish-caustics-04.png b/data/textures/jellyfish-caustics-04.png
new file mode 100644
index 0000000..54ff74f
--- /dev/null
+++ b/data/textures/jellyfish-caustics-04.png
diff --git a/data/textures/jellyfish-caustics-05.png b/data/textures/jellyfish-caustics-05.png
new file mode 100644
index 0000000..5884028
--- /dev/null
+++ b/data/textures/jellyfish-caustics-05.png
diff --git a/data/textures/jellyfish-caustics-06.png b/data/textures/jellyfish-caustics-06.png
new file mode 100644
index 0000000..af56e17
--- /dev/null
+++ b/data/textures/jellyfish-caustics-06.png
diff --git a/data/textures/jellyfish-caustics-07.png b/data/textures/jellyfish-caustics-07.png
new file mode 100644
index 0000000..40ab56e
--- /dev/null
+++ b/data/textures/jellyfish-caustics-07.png
diff --git a/data/textures/jellyfish-caustics-08.png b/data/textures/jellyfish-caustics-08.png
new file mode 100644
index 0000000..a94827e
--- /dev/null
+++ b/data/textures/jellyfish-caustics-08.png
diff --git a/data/textures/jellyfish-caustics-09.png b/data/textures/jellyfish-caustics-09.png
new file mode 100644
index 0000000..d3f9fd5
--- /dev/null
+++ b/data/textures/jellyfish-caustics-09.png
diff --git a/data/textures/jellyfish-caustics-10.png b/data/textures/jellyfish-caustics-10.png
new file mode 100644
index 0000000..93ff0ca
--- /dev/null
+++ b/data/textures/jellyfish-caustics-10.png
diff --git a/data/textures/jellyfish-caustics-11.png b/data/textures/jellyfish-caustics-11.png
new file mode 100644
index 0000000..3fcefb5
--- /dev/null
+++ b/data/textures/jellyfish-caustics-11.png
diff --git a/data/textures/jellyfish-caustics-12.png b/data/textures/jellyfish-caustics-12.png
new file mode 100644
index 0000000..cea8464
--- /dev/null
+++ b/data/textures/jellyfish-caustics-12.png
diff --git a/data/textures/jellyfish-caustics-13.png b/data/textures/jellyfish-caustics-13.png
new file mode 100644
index 0000000..b2a1b80
--- /dev/null
+++ b/data/textures/jellyfish-caustics-13.png
diff --git a/data/textures/jellyfish-caustics-14.png b/data/textures/jellyfish-caustics-14.png
new file mode 100644
index 0000000..332dc11
--- /dev/null
+++ b/data/textures/jellyfish-caustics-14.png
diff --git a/data/textures/jellyfish-caustics-15.png b/data/textures/jellyfish-caustics-15.png
new file mode 100644
index 0000000..3bcca56
--- /dev/null
+++ b/data/textures/jellyfish-caustics-15.png
diff --git a/data/textures/jellyfish-caustics-16.png b/data/textures/jellyfish-caustics-16.png
new file mode 100644
index 0000000..59c4aae
--- /dev/null
+++ b/data/textures/jellyfish-caustics-16.png
diff --git a/data/textures/jellyfish-caustics-17.png b/data/textures/jellyfish-caustics-17.png
new file mode 100644
index 0000000..b1d66aa
--- /dev/null
+++ b/data/textures/jellyfish-caustics-17.png
diff --git a/data/textures/jellyfish-caustics-18.png b/data/textures/jellyfish-caustics-18.png
new file mode 100644
index 0000000..599ed61
--- /dev/null
+++ b/data/textures/jellyfish-caustics-18.png
diff --git a/data/textures/jellyfish-caustics-19.png b/data/textures/jellyfish-caustics-19.png
new file mode 100644
index 0000000..aa15d4a
--- /dev/null
+++ b/data/textures/jellyfish-caustics-19.png
diff --git a/data/textures/jellyfish-caustics-20.png b/data/textures/jellyfish-caustics-20.png
new file mode 100644
index 0000000..2b15211
--- /dev/null
+++ b/data/textures/jellyfish-caustics-20.png
diff --git a/data/textures/jellyfish-caustics-21.png b/data/textures/jellyfish-caustics-21.png
new file mode 100644
index 0000000..851ccd6
--- /dev/null
+++ b/data/textures/jellyfish-caustics-21.png
diff --git a/data/textures/jellyfish-caustics-22.png b/data/textures/jellyfish-caustics-22.png
new file mode 100644
index 0000000..7ac4b92
--- /dev/null
+++ b/data/textures/jellyfish-caustics-22.png
diff --git a/data/textures/jellyfish-caustics-23.png b/data/textures/jellyfish-caustics-23.png
new file mode 100644
index 0000000..753b9a9
--- /dev/null
+++ b/data/textures/jellyfish-caustics-23.png
diff --git a/data/textures/jellyfish-caustics-24.png b/data/textures/jellyfish-caustics-24.png
new file mode 100644
index 0000000..b4a8469
--- /dev/null
+++ b/data/textures/jellyfish-caustics-24.png
diff --git a/data/textures/jellyfish-caustics-25.png b/data/textures/jellyfish-caustics-25.png
new file mode 100644
index 0000000..d34203a
--- /dev/null
+++ b/data/textures/jellyfish-caustics-25.png
diff --git a/data/textures/jellyfish-caustics-26.png b/data/textures/jellyfish-caustics-26.png
new file mode 100644
index 0000000..1463548
--- /dev/null
+++ b/data/textures/jellyfish-caustics-26.png
diff --git a/data/textures/jellyfish-caustics-27.png b/data/textures/jellyfish-caustics-27.png
new file mode 100644
index 0000000..40d8366
--- /dev/null
+++ b/data/textures/jellyfish-caustics-27.png
diff --git a/data/textures/jellyfish-caustics-28.png b/data/textures/jellyfish-caustics-28.png
new file mode 100644
index 0000000..e65f676
--- /dev/null
+++ b/data/textures/jellyfish-caustics-28.png
diff --git a/data/textures/jellyfish-caustics-29.png b/data/textures/jellyfish-caustics-29.png
new file mode 100644
index 0000000..4156dcf
--- /dev/null
+++ b/data/textures/jellyfish-caustics-29.png
diff --git a/data/textures/jellyfish-caustics-30.png b/data/textures/jellyfish-caustics-30.png
new file mode 100644
index 0000000..54c1360
--- /dev/null
+++ b/data/textures/jellyfish-caustics-30.png
diff --git a/data/textures/jellyfish-caustics-31.png b/data/textures/jellyfish-caustics-31.png
new file mode 100644
index 0000000..3a53f03
--- /dev/null
+++ b/data/textures/jellyfish-caustics-31.png
diff --git a/data/textures/jellyfish-caustics-32.png b/data/textures/jellyfish-caustics-32.png
new file mode 100644
index 0000000..7033b65
--- /dev/null
+++ b/data/textures/jellyfish-caustics-32.png
diff --git a/data/textures/jellyfish256.png b/data/textures/jellyfish256.png
new file mode 100644
index 0000000..b54b7b4
--- /dev/null
+++ b/data/textures/jellyfish256.png
diff --git a/data/textures/nasa1.png b/data/textures/nasa1.png
new file mode 100644
index 0000000..e1bf8c6
--- /dev/null
+++ b/data/textures/nasa1.png
diff --git a/data/textures/nasa2.png b/data/textures/nasa2.png
new file mode 100644
index 0000000..c8fd209
--- /dev/null
+++ b/data/textures/nasa2.png
diff --git a/data/textures/nasa3.png b/data/textures/nasa3.png
new file mode 100644
index 0000000..494a1af
--- /dev/null
+++ b/data/textures/nasa3.png
diff --git a/data/textures/terrain-backgrounddetailed6.jpg b/data/textures/terrain-backgrounddetailed6.jpg
new file mode 100644
index 0000000..1c3ba04
--- /dev/null
+++ b/data/textures/terrain-backgrounddetailed6.jpg
diff --git a/data/textures/terrain-grasslight-512-nm.jpg b/data/textures/terrain-grasslight-512-nm.jpg
new file mode 100644
index 0000000..3200002
--- /dev/null
+++ b/data/textures/terrain-grasslight-512-nm.jpg
diff --git a/data/textures/terrain-grasslight-512.jpg b/data/textures/terrain-grasslight-512.jpg
new file mode 100644
index 0000000..242192a
--- /dev/null
+++ b/data/textures/terrain-grasslight-512.jpg
diff --git a/data/wscript_build b/data/wscript_build
new file mode 100644
index 0000000..e613b08
--- /dev/null
+++ b/data/wscript_build
@@ -0,0 +1,8 @@
+bld.install_files('${GLMARK_DATA_PATH}/models',
+                  bld.path.ant_glob('models/*'))
+
+bld.install_files('${GLMARK_DATA_PATH}/shaders',
+                  bld.path.ant_glob('shaders/*'))
+
+bld.install_files('${GLMARK_DATA_PATH}/textures',
+                  bld.path.ant_glob('textures/*'))
diff --git a/debian/bzr-builder.manifest b/debian/bzr-builder.manifest
new file mode 100644
index 0000000..bec8b51
--- /dev/null
+++ b/debian/bzr-builder.manifest
@@ -0,0 +1,3 @@
+# bzr-builder format 0.3 deb-version {debupstream}+20121219+bzr258+pkg26
+lp:glmark2 revid:jesse.barker@linaro.org-20121218194434-f2r1bkjaqj0k5s33
+nest-part packaging lp:~glmark2-dev/glmark2/glmark2-package debian debian revid:jesse.barker@linaro.org-20121218194819-oxo9ngy1hkv60dl7
diff --git a/debian/changelog b/debian/changelog
new file mode 100644
index 0000000..5bfc95b
--- /dev/null
+++ b/debian/changelog
@@ -0,0 +1,158 @@
+glmark2 (2012.12-0~linaro1~quantal1) quantal; urgency=low
+
+  * New upstream release 2012.12.
+
+ -- Jesse Barker <jesse.barker@linaro.org>  Tue, 18 Dec 2012 11:47:27 -0800
+
+glmark2 (2012.11-0~linaro1~quantal1) quantal; urgency=low
+
+  * New upstream release 2012.11.
+
+ -- Jesse Barker <jesse.barker@linaro.org>  Wed, 28 Nov 2012 15:58:59 -0800
+
+glmark2 (2012.08-0~linaro1~precise1) precise; urgency=low
+
+  * New upstream release 2012.08.
+
+ -- Alexandros Frantzis <alexandros.frantzis@linaro.org>  Fri, 17 Aug 2012 13:52:13 +0300
+
+glmark2 (2012.07-0~linaro1~precise1) precise; urgency=low
+
+  * New upstream release 2012.07.
+  * debian/changelog:
+    - Update dates to -2012 where needed.
+    - Add section for src/scene-ideas*.
+    - Add section for src/libjpeg-turbo/*.
+
+ -- Alexandros Frantzis <alexandros.frantzis@linaro.org>  Thu, 19 Jul 2012 12:32:37 +0300
+
+glmark2 (2012.06-0~linaro1~precise2) precise; urgency=low
+
+  * debian/control:
+    - Add libjpeg-dev build dependency.
+
+ -- Alexandros Frantzis <alexandros.frantzis@linaro.org>  Thu, 28 Jun 2012 13:46:52 +0300
+
+glmark2 (2012.06-0~linaro1~precise1) precise; urgency=low
+
+  * New upstream release 2012.06.
+  * debian/rules:
+    - Clean compiled python code from unpacked waflib/ directory, as
+      described in http://wiki.debian.org/UnpackWaf .
+
+ -- Alexandros Frantzis <alexandros.frantzis@linaro.org>  Thu, 21 Jun 2012 16:55:53 +0300
+
+glmark2 (2012.05-0~linaro1~precise1) precise; urgency=low
+
+  * New upstream release 2012.05.
+  * debian/control:
+    - Update Standards-Version to 3.9.3.
+
+ -- Alexandros Frantzis <alexandros.frantzis@linaro.org>  Thu, 24 May 2012 13:45:13 +0300
+
+glmark2 (2012.03-0~linaro1~precise1) precise; urgency=low
+
+  * New upstream release 2012.03.
+
+ -- Alexandros Frantzis <alexandros.frantzis@linaro.org>  Thu, 22 Mar 2012 11:53:33 +0200
+
+glmark2 (2012.02-0~linaro1~precise1) precise; urgency=low
+
+  * New upstream release 2012.02.
+
+ -- Alexandros Frantzis <alexandros.frantzis@linaro.org>  Thu, 16 Feb 2012 13:19:11 +0200
+
+glmark2 (2012.01-0~linaro1~precise1) precise; urgency=low
+
+  * New upstream release 2012.01.
+
+ -- Alexandros Frantzis <alexandros.frantzis@linaro.org>  Thu, 19 Jan 2012 20:20:05 +0200
+
+glmark2 (2011.12-0~linaro1~oneiric1) oneiric; urgency=low
+
+  * New upstream release 2011.12.
+
+ -- Alexandros Frantzis <alexandros.frantzis@linaro.org>  Thu, 15 Dec 2011 16:08:48 +0200
+
+glmark2 (2011.11-0~linaro1) oneiric; urgency=low
+
+  * New upstream release 2011.11.
+  * debian/copyright:
+    - Update Linaro copyright date entries from '2010' to '2010-2011'.
+
+ -- Alexandros Frantzis <alexandros.frantzis@linaro.org>  Wed, 16 Nov 2011 13:13:22 +0200
+
+glmark2 (2011.10-0~linaro1) oneiric; urgency=low
+
+  * New upstream release 2011.10.
+  * debian/control:
+    - Use libegl1-x11-dev as an build-dep alternative instead of libegl1-dev.
+    - Update description of glmark2-data binary package.
+
+ -- Alexandros Frantzis <alexandros.frantzis@linaro.org>  Tue, 18 Oct 2011 16:05:00 +0300
+
+glmark2 (2011.09-0~linaro1) oneiric; urgency=low
+
+  * New upstream release 2011.09.
+  * debian/control:
+    - Start the description of the glmark2-data package with
+      a lowercase letter.
+
+ -- Alexandros Frantzis <alexandros.frantzis@linaro.org>  Thu, 22 Sep 2011 11:32:17 +0300
+
+glmark2 (2011.08-0~linaro1) oneiric; urgency=low
+
+  * New upstream release 2011.08.
+  * debian/copyright:
+    - Add copyright information for src/libpng.
+
+ -- Alexandros Frantzis <alexandros.frantzis@linaro.org>  Fri, 19 Aug 2011 00:49:08 +0300
+
+glmark2 (2011.07-0~linaro1) oneiric; urgency=low
+
+  * New upstream release 2011.07.
+  * debian/copyright:
+    - Use a standalone license paragraph for the GPL3+ license text.
+
+ -- Alexandros Frantzis <alexandros.frantzis@linaro.org>  Thu, 21 Jul 2011 12:19:15 +0300
+
+glmark2 (2011.06-0~linaro1) oneiric; urgency=low
+
+  * New upstream release 2011.06.
+  * debian/copyright:
+    - Added copyright information for src/libmatrix/*
+
+ -- Alexandros Frantzis <alexandros.frantzis@linaro.org>  Fri, 24 Jun 2011 14:54:40 +0300
+
+glmark2 (11.05-0~linaro1) natty; urgency=low
+
+  * New upstream release 11.05.
+  * debian/control:
+    - Change maintainer to "Alexandros Frantzis".
+    - Update Standards-Version to 3.9.2
+    - Use python (>= 2.4) as a build-dependency instead of explicitly
+      stating alternative python versions.
+
+ -- Alexandros Frantzis <alexandros.frantzis@linaro.org>  Mon, 30 May 2011 14:07:36 +0300
+
+glmark2 (11.01-0ubuntu1) natty; urgency=low
+
+  * New upstream version 11.01 (LP: #707492).
+  * debian/rules:
+    - Use the new --enable-glesv2, --enable-gl configure flags.
+  * debian/copyright:
+    - Update copyright.
+    - Change main source license to GPL-3+ (from GPL-3).
+  * debian/control:
+    - Change maintainer to "Linaro Graphics Working Group".
+  * debian/watch:
+    - Add watch file.
+
+ -- Alexandros Frantzis <alexandros.frantzis@linaro.org>  Tue, 25 Jan 2011 17:53:50 +0200
+
+glmark2 (10.07.1-0ubuntu1) maverick; urgency=low
+
+  * Initial release for linaro/maverick (LP: #605901)
+    - see: https://blueprints.launchpad.net/ubuntu/+spec/arm-m-ui-and-test-heads
+
+ -- Alexandros Frantzis <alexandros.frantzis@linaro.org>  Wed, 28 Jul 2010 18:22:35 +0300
diff --git a/debian/compat b/debian/compat
new file mode 100644
index 0000000..7f8f011
--- /dev/null
+++ b/debian/compat
@@ -0,0 +1 @@
+7
diff --git a/debian/control b/debian/control
new file mode 100644
index 0000000..1f52bed
--- /dev/null
+++ b/debian/control
@@ -0,0 +1,45 @@
+Source: glmark2
+Section: misc
+Priority: optional
+Maintainer: Alexandros Frantzis <alexandros.frantzis@linaro.org>
+Build-Depends: debhelper (>= 7.0.50~),
+               libegl1-mesa-dev | libegl1-x11-dev,
+               libgl1-mesa-dev | libgl1-dev,
+               libgles2-mesa-dev | libgles2-dev,
+               libjpeg-dev,
+               libpng12-dev,
+               libx11-dev,
+               pkg-config,
+               python (>= 2.4)
+Standards-Version: 3.9.3
+Homepage: https://launchpad.net/glmark2
+
+Package: glmark2
+Architecture: any
+Depends: glmark2-data (= ${source:Version}), ${misc:Depends}, ${shlibs:Depends}
+Description: OpenGL (ES) 2.0 benchmark
+ A benchmark for OpenGL (ES) 2.0 that uses only the OpenGL ES 2.0 compatible
+ API. It contains tests for standard OpenGL (ES) 2.0 features, such as vertex
+ arrays, VBOs, texturing and shaders.
+ .
+ This package contains the OpenGL 2.0 variant of the benchmark.
+
+Package: glmark2-es2
+Architecture: any
+Depends: glmark2-data (= ${source:Version}), ${misc:Depends}, ${shlibs:Depends}
+Description: OpenGL (ES) 2.0 benchmark
+ A benchmark for OpenGL (ES) 2.0 that uses only the OpenGL ES 2.0 compatible
+ API. It contains tests for standard OpenGL (ES) 2.0 features, such as vertex
+ arrays, VBOs, texturing and shaders.
+ .
+ This package contains the OpenGL ES 2.0 variant of the benchmark.
+
+Package: glmark2-data
+Architecture: all
+Depends: ${misc:Depends}
+Description: data files for the glmark2 OpenGL (ES) 2.0 benchmark
+ A benchmark for OpenGL (ES) 2.0 that uses only the OpenGL ES 2.0 compatible
+ API. It contains tests for standard OpenGL (ES) 2.0 features, such as vertex
+ arrays, VBOs, texturing and shaders.
+ .
+ This package contains the data files used by the glmark2 benchmark.
diff --git a/debian/copyright b/debian/copyright
new file mode 100644
index 0000000..a7908c6
--- /dev/null
+++ b/debian/copyright
@@ -0,0 +1,102 @@
+Format-Specification: http://svn.debian.org/wsvn/dep/web/deps/dep5.mdwn?op=file&rev=135
+Name: glmark2
+Source: http://launchpad.net/glmark2
+
+Files: *
+Copyright: 2008 Ben Smith
+           2010-2012 Linaro Limited
+License: GPL-3+
+
+Files: src/scene-ideas*
+Copyright: 1993 Silicon Graphics, Inc
+           2012 Linaro Limited
+License: GPL-3+
+
+Files: src/libmatrix/*
+Copyright: 2010-2012 Linaro Limited
+License:
+ Permission is hereby granted, free of charge, to any person obtaining a copy
+ of this software and associated documentation files (the "Software"), to deal
+ in the Software without restriction, including without limitation the rights
+ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ copies of the Software, and to permit persons to whom the Software is
+ furnished to do so, subject to the following conditions:
+ .
+ The above copyright notice and this permission notice shall be included in
+ all copies or substantial portions of the Software.
+ .
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ THE SOFTWARE.
+
+Files: src/libpng/*
+Copyright: 1998-2011 Glenn Randers-Pehrson
+           1996-1997 Andreas Dilger
+           1995-1996 Guy Eric Schalnat, Group 42, Inc.
+License: Zlib
+ This software is provided 'as-is', without any express or implied warranty. In
+ no event will the authors be held liable for any damages arising from the use
+ of this software.
+ .
+ Permission is granted to anyone to use this software for any purpose,
+ including commercial applications, and to alter it and redistribute it freely,
+ subject to the following restrictions:
+ .
+ 1. The origin of this software must not be misrepresented; you must not claim
+ that you wrote the original software. If you use this software in a product,
+ an acknowledgment in the product documentation would be appreciated but is not
+ required.
+ .
+ 2. Altered source versions must be plainly marked as such, and must not be
+ misrepresented as being the original software.
+ .
+ 3. This notice may not be removed or altered from any source distribution.
+
+Files: src/libjpeg-turbo/*
+Copyright: 1991-2010 Thomas G. Lane, Guido Vollbeding
+           1999-2006 MIYASAKA Masaru
+           2009 Pierre Ossman for Cendio AB
+           2009-2012 D. R. Commander
+           2009-2011 Nokia Corporation and/or its subsidiary(-ies)
+License:
+ Permission is hereby granted to use, copy, modify, and distribute this
+ software (or portions thereof) for any purpose, without fee, subject to these
+ conditions:
+ .
+ (1) If any part of the source code for this software is distributed, then this
+ README file must be included, with this copyright and no-warranty notice
+ unaltered; and any additions, deletions, or changes to the original files
+ must be clearly indicated in accompanying documentation.
+ .
+ (2) If only executable code is distributed, then the accompanying
+ documentation must state that "this software is based in part on the work of
+ the Independent JPEG Group".
+ .
+ (3) Permission for use of this software is granted only if the user accepts
+ full responsibility for any undesirable consequences; the authors accept
+ NO LIABILITY for damages of any kind.
+
+Files: debian/*
+Copyright: 2010-2012 Linaro
+License: GPL-3+
+
+License: GPL-3+
+ This program is free software; you can redistribute it and/or modify it under
+ the terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3 of the License, or (at your option) any later
+ version.
+ .
+ This package is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU General Public License for more details.
+ .
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+ On Debian systems, the full text of the GNU General Public License
+ version 3 can be found in the file `/usr/share/common-licenses/GPL-3'
diff --git a/debian/glmark2-data.install b/debian/glmark2-data.install
new file mode 100644
index 0000000..4b7ef99
--- /dev/null
+++ b/debian/glmark2-data.install
@@ -0,0 +1 @@
+usr/share/glmark2
diff --git a/debian/glmark2-es2.install b/debian/glmark2-es2.install
new file mode 100644
index 0000000..081050f
--- /dev/null
+++ b/debian/glmark2-es2.install
@@ -0,0 +1 @@
+usr/bin/glmark2-es2
diff --git a/debian/glmark2-es2.manpages b/debian/glmark2-es2.manpages
new file mode 100644
index 0000000..b5b4747
--- /dev/null
+++ b/debian/glmark2-es2.manpages
@@ -0,0 +1 @@
+debian/tmp/usr/share/man/man1/glmark2-es2.1
diff --git a/debian/glmark2.install b/debian/glmark2.install
new file mode 100644
index 0000000..8b4b050
--- /dev/null
+++ b/debian/glmark2.install
@@ -0,0 +1 @@
+usr/bin/glmark2
diff --git a/debian/glmark2.manpages b/debian/glmark2.manpages
new file mode 100644
index 0000000..f994c0f
--- /dev/null
+++ b/debian/glmark2.manpages
@@ -0,0 +1 @@
+debian/tmp/usr/share/man/man1/glmark2.1
diff --git a/debian/rules b/debian/rules
new file mode 100755
index 0000000..1054455
--- /dev/null
+++ b/debian/rules
@@ -0,0 +1,27 @@
+#!/usr/bin/make -f
+# -*- makefile -*-
+
+# Uncomment this to turn on verbose mode.
+#export DH_VERBOSE=1
+
+# This has to be exported to make some magic below work.
+export DH_OPTIONS
+
+
+%:
+	dh $@
+
+override_dh_auto_configure:
+	./waf configure --enable-gl --enable-glesv2 --prefix=/usr
+
+override_dh_auto_build:
+	./waf
+
+override_dh_auto_install:
+	./waf install --destdir=debian/tmp
+
+override_dh_auto_clean:
+	./waf distclean
+	# Clean compiled python code from unpacked waflib/ directory, as
+	# described in http://wiki.debian.org/UnpackWaf .
+	-find waflib -name "*.pyc" -delete
diff --git a/debian/source/format b/debian/source/format
new file mode 100644
index 0000000..89ae9db
--- /dev/null
+++ b/debian/source/format
@@ -0,0 +1 @@
+3.0 (native)
diff --git a/debian/watch b/debian/watch
new file mode 100644
index 0000000..fa60fce
--- /dev/null
+++ b/debian/watch
@@ -0,0 +1,2 @@
+version=3
+http://launchpad.net/glmark2/+download http://launchpad.net/glmark2/trunk/.*/\+download/glmark2-(.*)\.tar\.gz
diff --git a/doc/glmark2.1.in b/doc/glmark2.1.in
new file mode 100644
index 0000000..f2409df
--- /dev/null
+++ b/doc/glmark2.1.in
@@ -0,0 +1,115 @@
+.TH @APPNAME@ "1" "December 2012" "@appname@ @appversion@"
+.SH NAME
+@appname@ \- OpenGL (ES) 2.0 benchmark suite
+.SH SYNOPSIS
+.B @appname@ [options]
+.SH DESCRIPTION
+\fB@appname@\fP is a benchmark for OpenGL (ES) 2.0. It only uses the subset of
+the OpenGL 2.0 API that is compatible with OpenGL ES 2.0.
+.SH OPTIONS
+.TP
+\fB\-b\fR, \fB\-\-benchmark\fR BENCH
+A benchmark to run: 'scene(:opt1=val1)*'
+(the option can be used multiple times)
+.TP
+\fB\-f\fR, \fB\-\-benchmark-file\fR FILE
+Load benchmarks to run from a file containing a
+list of benchmark descriptions (one per line)
+(the option can be used multiple times)
+.TP
+\fB\-\-validate\fR
+Run a quick output validation test instead of
+running the benchmarks
+.TP
+\fB\-\-frame-end\fR METHOD
+How to end a frame [default,none,swap,finish,readpixels]
+.TP
+\fB\-\-off-screen\fR
+Render to an off-screen surface
+.TP
+\fB--visual-config\fR
+The visual configuration to use for the rendering target:
+\'red=R:green=G:blue=B:alpha=A:buffer=BUF'. The parameters may be defined
+in any order, and any omitted parameters assume a default value of '1'
+.TP
+\fB\-\-reuse\-context\fR
+Use a single context for all scenes
+(by default, each scene gets its own context)
+.TP
+\fB\-s\fR, \fB\-\-size\fR WxH
+Size of the output window (default: 800x600)
+.TP
+\fB\-\-fullscreen\fR
+Run in fullscreen mode (equivalent to --size -1x-1)
+.TP
+\fB\-l\fR, \fB\-\-list\-scenes\fR
+Display information about the available scenes
+and their options
+.TP
+\fB\-\-show-all-options\fR
+Show all scene option values used for benchmarks
+(only explicitly set options are shown by default)
+.TP
+\fB\-\-run-forever\fR
+Run indefinitely, looping from the last benchmark
+back to the first
+.TP
+\fB\-\-annotate\fR
+Annotate the benchmarks with on-screen information
+(same as -b :show-fps=true:title=#info#)
+.TP
+\fB\-d\fR, \fB\-\-debug\fR
+Display debug messages
+.TP
+\fB\-h\fR, \fB\-\-help\fR
+Display help
+.SH BENCHMARKS
+@appname@ offers a suite of scenes that can be used to measure many aspects
+of OpenGL (ES) 2.0 performance. The way in which each scene is rendered is
+configurable through a set of options. To get the available scenes and their
+acceptable options you can use the \fB\-l\fR, \fB\-\-list\-scenes\fR command
+line option.
+
+In @appname@, a benchmark is defined as a scene plus a set of option values.
+You can specify the list and order of the benchmarks to run by using the
+\fB\-b\fR, \fB\-\-benchmark\fR command line option (possibly multiple times).
+If no benchmarks are specified, a default set of benchmarks is used. If a
+benchmark option is not specified it assumes its default value (listed with
+\fB\-l\fR, \fB\-\-list\-scenes\fR).
+
+As a special case, a benchmark description string is allowed to not contain a
+scene name (i.e. to start with ':'). In this case, any specified option values
+are used as the default values for benchmarks following this description
+string.
+
+.SH EXAMPLES
+To run the default benchmarks:
+.PP
+.RS
+\fB@appname@\fR
+.RE
+.PP
+To run a benchmark using scene 'shading' with a 'duration' of '5.0' seconds and
+ 'shading' of type 'phong':
+.PP
+.RS
+\fB@appname@ -b shading:duration=5.0:shading=phong\fR
+.RE
+.PP
+To run a series of benchmarks use the \fB\-b\fR, \fB\-\-benchmark\fR command
+line option multiple times:
+.PP
+.RS
+\fB@appname@ -b shading:duration=5.0 -b build:use-vbo=false -b texture\fR
+.RE
+.PP
+To set default option values for benchmarks:
+.PP
+.RS
+\fB@appname@ -b :duration=2.0 -b shading -b build -b :duration=5.0 -b texture\fR
+.RE
+.PP
+
+.SH AUTHOR
+@appname@ was written by Alexandros Frantzis based on the original glmark by
+Ben Smith.
diff --git a/doc/wscript_build b/doc/wscript_build
new file mode 100644
index 0000000..8b23b79
--- /dev/null
+++ b/doc/wscript_build
@@ -0,0 +1,21 @@
+if bld.env.USE_GL:
+    bld(
+        features = 'subst',
+        source = 'glmark2.1.in',
+        target = bld.path.find_or_declare('glmark2.1'),
+        APPNAME = 'GLMARK2',
+        appname = 'glmark2',
+        appversion = bld.env.GLMARK2_VERSION,
+        install_path = '${MANDIR}/man1'
+    )
+
+if bld.env.USE_GLESv2:
+    bld(
+        features = 'subst',
+        source = 'glmark2.1.in',
+        target = bld.path.find_or_declare('glmark2-es2.1'),
+        APPNAME = 'GLMARK2-ES2',
+        appname = 'glmark2-es2',
+        appversion = bld.env.GLMARK2_VERSION,
+        install_path = '${MANDIR}/man1'
+    )
diff --git a/src/android.cpp b/src/android.cpp
new file mode 100644
index 0000000..d098626
--- /dev/null
+++ b/src/android.cpp
@@ -0,0 +1,532 @@
+/*
+ * Copyright © 2011 Linaro Limited
+ * Copyright © 2011 0xlab - http://0xlab.org/
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis (glmark2)
+ *  Jim Huang (Strict JNI registration using JNI_OnLoad())
+ */
+#include <assert.h>
+#include <jni.h>
+#include <vector>
+#include <string>
+#include <fstream>
+#include "canvas-android.h"
+#include "benchmark.h"
+#include "options.h"
+#include "log.h"
+#include "util.h"
+#include "main-loop.h"
+#include "benchmark-collection.h"
+
+static Canvas *g_canvas;
+static MainLoop *g_loop;
+static BenchmarkCollection *g_benchmark_collection;
+static std::ostream *g_log_extra;
+
+class MainLoopAndroid : public MainLoop
+{
+public:
+    MainLoopAndroid(Canvas &canvas, const std::vector<Benchmark *> &benchmarks) :
+        MainLoop(canvas, benchmarks) {}
+
+    virtual void log_scene_info() {}
+
+    virtual void log_scene_result()
+    {
+        if (scene_setup_status_ == SceneSetupStatusSuccess) {
+            Log::info("%s FPS: %u FrameTime: %.3f ms\n",
+                      scene_->info_string().c_str(),
+                      scene_->average_fps(),
+                      1000.0 / scene_->average_fps());
+        }
+        else if (scene_setup_status_ == SceneSetupStatusUnsupported) {
+            Log::info("%s Unsupported\n",
+                      scene_->info_string().c_str());
+        }
+        else {
+            Log::info("%s Set up failed\n",
+                      scene_->info_string().c_str());
+        }
+    }
+};
+
+class MainLoopDecorationAndroid : public MainLoopDecoration
+{
+public:
+    MainLoopDecorationAndroid(Canvas &canvas, const std::vector<Benchmark *> &benchmarks) :
+        MainLoopDecoration(canvas, benchmarks) {}
+
+    virtual void log_scene_info() {}
+
+    virtual void log_scene_result()
+    {
+        if (scene_setup_status_ == SceneSetupStatusSuccess) {
+            Log::info("%s FPS: %u FrameTime: %.3f ms\n",
+                      scene_->info_string().c_str(),
+                      scene_->average_fps(),
+                      1000.0 / scene_->average_fps());
+        }
+        else if (scene_setup_status_ == SceneSetupStatusUnsupported) {
+            Log::info("%s Unsupported\n",
+                      scene_->info_string().c_str());
+        }
+        else {
+            Log::info("%s Set up failed\n",
+                      scene_->info_string().c_str());
+        }
+    }
+};
+
+/** 
+ * Converts an std::vector containing arguments to argc,argv.
+ */
+static void
+arg_vector_to_argv(const std::vector<std::string> &arguments, int &argc, char **&argv)
+{
+    argc = arguments.size() + 1;
+    argv = new char* [argc];
+    argv[0] = strdup("glmark2");
+
+    for (unsigned int i = 0; i < arguments.size(); i++)
+        argv[i + 1] = strdup(arguments[i].c_str());
+}
+
+/** 
+ * Populates the command line arguments from the arguments file.
+ * 
+ * @param argc the number of arguments
+ * @param argv the argument array
+ */
+static void
+get_args_from_file(const std::string &arguments_file, int &argc, char **&argv)
+{
+    std::vector<std::string> arguments;
+    std::ifstream ifs(arguments_file.c_str());
+
+    if (!ifs.fail()) {
+        std::string line;
+        while (getline(ifs, line)) {
+            if (!line.empty())
+                Util::split(line, ' ', arguments, Util::SplitModeQuoted);
+        }
+    }
+
+    arg_vector_to_argv(arguments, argc, argv);
+}
+
+/** 
+ * Populates the command line arguments from the arguments file.
+ * 
+ * @param argc the number of arguments
+ * @param argv the argument array
+ */
+static void
+get_args_from_string(const std::string &args_str, int &argc, char **&argv)
+{
+    std::vector<std::string> arguments;
+    Util::split(args_str, ' ', arguments, Util::SplitModeQuoted);
+
+    arg_vector_to_argv(arguments, argc, argv);
+}
+
+/** 
+ * Releases the command line arguments.
+ * 
+ * @param argc the number of arguments
+ * @param argv the argument array
+ */
+static void
+release_args(int argc, char **argv)
+{
+    for (int i = 0; i < argc; i++)
+        free(argv[i]);
+
+    delete[] argv;
+}
+
+/** 
+ * Converts a GLVisualConfig Java object to a GLVisualConfig C++ object.
+ * 
+ * @param env the JNIEnv
+ * @param jvc the Java VisualConfig object to convert
+ * @param vc the C++ VisualConfig object to fill
+ */
+static void
+gl_visual_config_from_jobject(JNIEnv *env, jobject jvc, GLVisualConfig &vc)
+{
+    jclass cls = env->GetObjectClass(jvc);
+    jfieldID fid;
+
+    fid = env->GetFieldID(cls, "red", "I");
+    vc.red = env->GetIntField(jvc, fid);
+
+    fid = env->GetFieldID(cls, "green", "I");
+    vc.green = env->GetIntField(jvc, fid);
+    
+    fid = env->GetFieldID(cls, "blue", "I");
+    vc.blue = env->GetIntField(jvc, fid);
+
+    fid = env->GetFieldID(cls, "alpha", "I");
+    vc.alpha = env->GetIntField(jvc, fid);
+
+    fid = env->GetFieldID(cls, "depth", "I");
+    vc.depth = env->GetIntField(jvc, fid);
+
+    fid = env->GetFieldID(cls, "buffer", "I");
+    vc.buffer = env->GetIntField(jvc, fid);
+}
+
+/** 
+ * Creates a SceneInfo Java object from a Scene.
+ * 
+ * @param env the JNIEnv
+ */
+static jobject
+scene_info_from_scene(JNIEnv *env, Scene &scene)
+{
+    jclass cls = env->FindClass("org/linaro/glmark2/SceneInfo");
+    jmethodID constructor = env->GetMethodID(cls, "<init>", "(Ljava/lang/String;)V");
+    jmethodID add_option = env->GetMethodID(cls, "addOption", "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;[Ljava/lang/String;)V");
+
+    /* Create the SceneInfo object */
+    jstring name = env->NewStringUTF(scene.name().c_str());
+    jobject scene_info = env->NewObject(cls, constructor, name);
+
+    const std::map<std::string, Scene::Option> &options = scene.options();
+
+    /* Add options to the SceneInfo object */
+    for (std::map<std::string, Scene::Option>::const_iterator opt_iter = options.begin();
+         opt_iter != options.end();
+         opt_iter++)
+    {
+        const Scene::Option &opt = opt_iter->second;
+        jstring opt_name = env->NewStringUTF(opt.name.c_str());
+        jstring opt_description = env->NewStringUTF(opt.description.c_str());
+        jstring opt_default_value = env->NewStringUTF(opt.default_value.c_str());
+
+        /* Create and populate the acceptable values array */
+        jclass string_cls = env->FindClass("java/lang/String");
+        jobjectArray opt_acceptable_values = env->NewObjectArray(opt.acceptable_values.size(),
+                                                                 string_cls, 0);
+        
+        for (size_t i = 0; i < opt.acceptable_values.size(); i++) {
+            jstring opt_value = env->NewStringUTF(opt.acceptable_values[i].c_str());
+            env->SetObjectArrayElement(opt_acceptable_values, i, opt_value);
+            env->DeleteLocalRef(opt_value);
+        }
+
+        env->CallVoidMethod(scene_info, add_option,
+                            opt_name,
+                            opt_description,
+                            opt_default_value,
+                            opt_acceptable_values);
+
+        env->DeleteLocalRef(opt_name);
+        env->DeleteLocalRef(opt_description);
+        env->DeleteLocalRef(opt_default_value);
+        env->DeleteLocalRef(opt_acceptable_values);
+    }
+
+    return scene_info;
+}
+
+class DummyCanvas : public Canvas {
+public:
+    DummyCanvas() : Canvas(0, 0) {}
+};
+
+/** 
+ * Creates all the available scenes and adds them to the supplied vector.
+ * 
+ * @param scenes the vector to add the scenes to
+ * @param canvas the canvas to create the scenes with
+ */
+static void
+create_and_add_scenes(std::vector<Scene*>& scenes, Canvas& canvas)
+{
+    scenes.push_back(new SceneDefaultOptions(canvas));
+    scenes.push_back(new SceneBuild(canvas));
+    scenes.push_back(new SceneTexture(canvas));
+    scenes.push_back(new SceneShading(canvas));
+    scenes.push_back(new SceneConditionals(canvas));
+    scenes.push_back(new SceneFunction(canvas));
+    scenes.push_back(new SceneLoop(canvas));
+    scenes.push_back(new SceneBump(canvas));
+    scenes.push_back(new SceneEffect2D(canvas));
+    scenes.push_back(new ScenePulsar(canvas));
+    scenes.push_back(new SceneDesktop(canvas));
+    scenes.push_back(new SceneBuffer(canvas));
+    scenes.push_back(new SceneIdeas(canvas));
+    scenes.push_back(new SceneTerrain(canvas));
+    scenes.push_back(new SceneJellyfish(canvas));
+    scenes.push_back(new SceneShadow(canvas));
+    scenes.push_back(new SceneRefract(canvas));
+}
+
+
+void
+Java_org_linaro_glmark2_native_init(JNIEnv* env, jclass clazz,
+                                    jobject asset_manager,
+                                    jstring args,
+                                    jstring log_file)
+{
+    static_cast<void>(clazz);
+    static const std::string arguments_file("/data/glmark2/args");
+    int argc = 0;
+    char **argv = 0;
+
+    /* Load arguments from argument string or arguments file and parse them */
+    if (args) {
+        if (env->GetStringUTFLength(args) > 0) {
+            const char *args_c_str = env->GetStringUTFChars(args, 0);
+            if (args_c_str) {
+                get_args_from_string(std::string(args_c_str), argc, argv);
+                env->ReleaseStringUTFChars(args, args_c_str);
+            }
+        }
+    }
+    else {
+        get_args_from_file(arguments_file, argc, argv);
+    }
+
+    Options::parse_args(argc, argv);
+    release_args(argc, argv);
+
+    /* Get the log file path and open the log file */
+    const char *log_file_c_str = env->GetStringUTFChars(log_file, 0);
+    if (log_file_c_str) {
+        g_log_extra = new std::ofstream(log_file_c_str, std::ios::binary);
+        env->ReleaseStringUTFChars(log_file, log_file_c_str);
+    }
+
+    /* Force reuse of EGL/GL context */
+    Options::reuse_context = true;
+
+    Log::init("glmark2", Options::show_debug, g_log_extra);
+    Util::android_set_asset_manager(AAssetManager_fromJava(env, asset_manager));
+
+    g_canvas = new CanvasAndroid(100, 100);
+    g_canvas->init();
+
+    Log::info("glmark2 %s\n", GLMARK_VERSION);
+    g_canvas->print_info();
+
+    std::vector<Scene*> scenes;
+
+    /* Add and register scenes */
+    create_and_add_scenes(scenes, *g_canvas);
+
+    for (std::vector<Scene*>::const_iterator iter = scenes.begin();
+         iter != scenes.end();
+         iter++)
+    {
+        Benchmark::register_scene(**iter);
+    }
+
+    g_benchmark_collection = new BenchmarkCollection();
+    g_benchmark_collection->populate_from_options();
+
+    if (g_benchmark_collection->needs_decoration()) {
+        g_loop = new MainLoopDecorationAndroid(*g_canvas,
+                                               g_benchmark_collection->benchmarks());
+    }
+    else {
+        g_loop = new MainLoopAndroid(*g_canvas,
+                                     g_benchmark_collection->benchmarks());
+    }
+}
+
+void
+Java_org_linaro_glmark2_native_resize(JNIEnv* env,
+                                      jclass clazz,
+                                      jint w,
+                                      jint h)
+{
+    static_cast<void>(env);
+    static_cast<void>(clazz);
+
+    Log::debug("Resizing to %d x %d\n", w, h);
+    g_canvas->resize(w, h);
+}
+
+void
+Java_org_linaro_glmark2_native_done(JNIEnv* env)
+{
+    static_cast<void>(env);
+
+    delete g_loop;
+    delete g_benchmark_collection;
+    delete g_canvas;
+    delete g_log_extra;
+}
+
+jboolean
+Java_org_linaro_glmark2_native_render(JNIEnv* env)
+{
+    static_cast<void>(env);
+
+    if (!g_loop->step()) {
+        Log::info("glmark2 Score: %u\n", g_loop->score());
+        return false;
+    }
+
+    return true;
+}
+
+jint
+Java_org_linaro_glmark2_native_scoreConfig(JNIEnv* env, jclass clazz,
+                                           jobject jvc, jobject jtarget)
+{
+    static_cast<void>(clazz);
+
+    GLVisualConfig vc;
+    GLVisualConfig target;
+
+    gl_visual_config_from_jobject(env, jvc, vc);
+    gl_visual_config_from_jobject(env, jtarget, target);
+
+    return vc.match_score(target);
+}
+
+jobjectArray
+Java_org_linaro_glmark2_native_getSceneInfo(JNIEnv* env, jclass clazz,
+                                            jobject asset_manager)
+{
+    static_cast<void>(clazz);
+
+    Util::android_set_asset_manager(AAssetManager_fromJava(env, asset_manager));
+
+    std::vector<Scene*> scenes;
+    DummyCanvas canvas;
+    std::vector<jobject> si_vector;
+
+    create_and_add_scenes(scenes, canvas);
+
+    /* Create SceneInfo instances for all the scenes */
+    for (std::vector<Scene*>::const_iterator iter = scenes.begin();
+         iter != scenes.end();
+         iter++)
+    {
+        jobject si = scene_info_from_scene(env, **iter);
+        si_vector.push_back(si);
+    }
+
+    /* Create a SceneInfo[] array */
+    jclass si_cls = env->FindClass("org/linaro/glmark2/SceneInfo");
+    jobjectArray si_array = env->NewObjectArray(si_vector.size(), si_cls, 0);
+    
+    /* Populate the SceneInfo[] array */
+    for (size_t i = 0; i < si_vector.size(); i++)
+        env->SetObjectArrayElement(si_array, i, si_vector[i]);
+
+    Util::dispose_pointer_vector(scenes);
+
+    return si_array;
+}
+
+static JNINativeMethod glmark2_native_methods[] = {
+    {
+        "init",
+        "(Landroid/content/res/AssetManager;Ljava/lang/String;Ljava/lang/String;)V",
+        reinterpret_cast<void*>(Java_org_linaro_glmark2_native_init)
+    },
+    {
+        "resize",
+        "(II)V",
+        reinterpret_cast<void*>(Java_org_linaro_glmark2_native_resize)
+    },
+    {
+        "done",
+        "()V",
+        reinterpret_cast<void*>(Java_org_linaro_glmark2_native_done)
+    },
+    {
+        "render",
+        "()Z",
+        reinterpret_cast<void*>(Java_org_linaro_glmark2_native_render)
+    },
+    {
+        "scoreConfig",
+        "(Lorg/linaro/glmark2/GLVisualConfig;Lorg/linaro/glmark2/GLVisualConfig;)I",
+        reinterpret_cast<void*>(Java_org_linaro_glmark2_native_scoreConfig)
+    },
+    {
+        "getSceneInfo",
+        "(Landroid/content/res/AssetManager;)[Lorg/linaro/glmark2/SceneInfo;",
+        reinterpret_cast<void*>(Java_org_linaro_glmark2_native_getSceneInfo)
+    }
+};
+
+static int
+register_native_methods(JNIEnv* env, const char* className,
+                        JNINativeMethod* gMethods, int numMethods)
+{
+    jclass clazz;
+
+    clazz = env->FindClass(className);
+    if (clazz == NULL) {
+        Log::error("Native registration unable to find class '%s'\n",
+                   className);
+        return JNI_FALSE;
+    }
+    if (env->RegisterNatives(clazz, gMethods, numMethods) < 0) {
+        Log::error("RegisterNatives failed for '%s'\n", className);
+        return JNI_FALSE;
+    }
+
+    return JNI_TRUE;
+}
+
+static int
+register_natives(JNIEnv *env)
+{
+    const char* const class_path_name = "org/linaro/glmark2/Glmark2Native";
+    return register_native_methods(env, class_path_name,
+                                   glmark2_native_methods,
+                                   sizeof(glmark2_native_methods) /
+                                   sizeof(glmark2_native_methods[0]));
+}
+
+/*
+ * Returns the JNI version on success, -1 on failure.
+ */
+extern "C" jint
+JNI_OnLoad(JavaVM* vm, void* reserved)
+{
+    static_cast<void>(reserved);
+    JNIEnv* env = NULL;
+    jint result = -1;
+
+    if (vm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_4) != JNI_OK) {
+        Log::error("JNI_OnLoad: GetEnv failed\n");
+        goto bail;
+    }
+    assert(env != NULL);
+
+    if (!register_natives(env)) {
+        Log::error("JNI_OnLoad: glmark2 native registration failed\n");
+        goto bail;
+    }
+
+    /* success -- return valid version number */
+    result = JNI_VERSION_1_4;
+
+bail:
+    return result;
+}
diff --git a/src/benchmark-collection.cpp b/src/benchmark-collection.cpp
new file mode 100644
index 0000000..3e73202
--- /dev/null
+++ b/src/benchmark-collection.cpp
@@ -0,0 +1,119 @@
+/*
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis
+ */
+#include <fstream>
+#include "benchmark-collection.h"
+#include "default-benchmarks.h"
+#include "options.h"
+#include "log.h"
+#include "util.h"
+
+BenchmarkCollection::~BenchmarkCollection()
+{
+    Util::dispose_pointer_vector(benchmarks_);
+}
+
+void
+BenchmarkCollection::add(const std::vector<std::string> &benchmarks)
+{
+    for (std::vector<std::string>::const_iterator iter = benchmarks.begin();
+         iter != benchmarks.end();
+         iter++)
+    {
+        benchmarks_.push_back(new Benchmark(*iter));
+    }
+}
+
+void
+BenchmarkCollection::populate_from_options()
+{
+    if (Options::annotate) {
+        std::vector<std::string> annotate;
+        annotate.push_back(":show-fps=true:title=#info#");
+        add(annotate);
+    }
+
+    if (!Options::benchmarks.empty())
+        add(Options::benchmarks);
+
+    if (!Options::benchmark_files.empty())
+        add_benchmarks_from_files();
+
+    if (!benchmarks_contain_normal_scenes())
+        add(DefaultBenchmarks::get());
+}
+
+bool
+BenchmarkCollection::needs_decoration()
+{
+    for (std::vector<Benchmark *>::const_iterator bench_iter = benchmarks_.begin();
+         bench_iter != benchmarks_.end();
+         bench_iter++)
+    {
+        const Benchmark *bench = *bench_iter;
+        if (bench->needs_decoration())
+            return true;
+    }
+
+    return false;
+}
+
+
+void
+BenchmarkCollection::add_benchmarks_from_files()
+{
+    for (std::vector<std::string>::const_iterator iter = Options::benchmark_files.begin();
+         iter != Options::benchmark_files.end();
+         iter++)
+    {
+        std::ifstream ifs(iter->c_str());
+
+        if (!ifs.fail()) {
+            std::string line;
+
+            while (getline(ifs, line)) {
+                if (!line.empty())
+                    benchmarks_.push_back(new Benchmark(line));
+            }
+        }
+        else {
+            Log::error("Cannot open benchmark file %s\n",
+                       iter->c_str());
+        }
+
+    }
+}
+
+bool
+BenchmarkCollection::benchmarks_contain_normal_scenes()
+{
+    for (std::vector<Benchmark *>::const_iterator bench_iter = benchmarks_.begin();
+         bench_iter != benchmarks_.end();
+         bench_iter++)
+    {
+        const Benchmark *bench = *bench_iter;
+        if (!bench->scene().name().empty())
+            return true;
+    }
+
+    return false;
+}
+
diff --git a/src/benchmark-collection.h b/src/benchmark-collection.h
new file mode 100644
index 0000000..f1dc0eb
--- /dev/null
+++ b/src/benchmark-collection.h
@@ -0,0 +1,59 @@
+/*
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis
+ */
+#ifndef GLMARK2_BENCHMARK_COLLECTION_H_
+#define GLMARK2_BENCHMARK_COLLECTION_H_
+
+#include <vector>
+#include <string>
+#include "benchmark.h"
+
+class BenchmarkCollection
+{
+public:
+    BenchmarkCollection() {}
+    ~BenchmarkCollection();
+
+    /*
+     * Adds benchmarks to the collection.
+     */
+    void add(const std::vector<std::string> &benchmarks);
+
+    /*
+     * Populates the collection guided by the global options.
+     */
+    void populate_from_options();
+
+    /*
+     * Whether the benchmarks in this collection need decoration.
+     */
+    bool needs_decoration();
+
+    const std::vector<Benchmark *>& benchmarks() { return benchmarks_; }
+
+private:
+    void add_benchmarks_from_files();
+    bool benchmarks_contain_normal_scenes();
+
+    std::vector<Benchmark *> benchmarks_;
+};
+
+#endif /* GLMARK2_BENCHMARK_COLLECTION_H_ */
diff --git a/src/benchmark.cpp b/src/benchmark.cpp
new file mode 100644
index 0000000..1f39c39
--- /dev/null
+++ b/src/benchmark.cpp
@@ -0,0 +1,161 @@
+/*
+ * Copyright © 2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis (glmark2)
+ */
+
+#include "benchmark.h"
+#include "log.h"
+#include "util.h"
+
+using std::string;
+using std::vector;
+using std::map;
+
+std::map<string, Scene *> Benchmark::sceneMap_;
+
+static Scene &
+get_scene_from_description(const string &s)
+{
+    vector<string> elems;
+
+    Util::split(s, ':', elems, Util::SplitModeNormal);
+
+    const string &name = !elems.empty() ? elems[0] : "";
+
+    return Benchmark::get_scene_by_name(name);
+}
+
+static vector<Benchmark::OptionPair>
+get_options_from_description(const string &s)
+{
+    vector<Benchmark::OptionPair> options;
+    vector<string> elems;
+
+    Util::split(s, ':', elems, Util::SplitModeNormal);
+
+    for (vector<string>::const_iterator iter = elems.begin() + 1;
+         iter != elems.end();
+         iter++)
+    {
+        vector<string> opt;
+
+        Util::split(*iter, '=', opt, Util::SplitModeNormal);
+        if (opt.size() == 2)
+            options.push_back(Benchmark::OptionPair(opt[0], opt[1]));
+        else
+            Log::info("Warning: ignoring invalid option string '%s' "
+                      "in benchmark description\n",
+                      iter->c_str());
+    }
+
+    return options;
+}
+
+void
+Benchmark::register_scene(Scene &scene)
+{
+    sceneMap_[scene.name()] = &scene;
+}
+
+Scene &
+Benchmark::get_scene_by_name(const string &name)
+{
+    map<string, Scene *>::const_iterator iter;
+
+    if ((iter = sceneMap_.find(name)) != sceneMap_.end())
+        return *(iter->second);
+    else
+        return Scene::dummy();
+}
+
+Benchmark::Benchmark(Scene &scene, const vector<OptionPair> &options) :
+    scene_(scene), options_(options)
+{
+}
+
+Benchmark::Benchmark(const string &name, const vector<OptionPair> &options) :
+    scene_(Benchmark::get_scene_by_name(name)), options_(options)
+{
+}
+
+Benchmark::Benchmark(const string &s) :
+    scene_(get_scene_from_description(s)),
+    options_(get_options_from_description(s))
+{
+}
+
+Scene &
+Benchmark::setup_scene()
+{
+    scene_.reset_options();
+    load_options();
+
+    scene_.load();
+    scene_.setup();
+
+    return scene_;
+}
+
+void
+Benchmark::teardown_scene()
+{
+    scene_.teardown();
+    scene_.unload();
+}
+
+bool
+Benchmark::needs_decoration() const
+{
+    for (vector<OptionPair>::const_iterator iter = options_.begin();
+         iter != options_.end();
+         iter++)
+    {
+        if ((iter->first == "show-fps" && iter->second == "true") ||
+            (iter->first == "title" && !iter->second.empty()))
+        {
+            return true;
+        }
+    }
+
+    return false;
+}
+
+void
+Benchmark::load_options()
+{
+    for (vector<OptionPair>::iterator iter = options_.begin();
+         iter != options_.end();
+         iter++)
+    {
+        if (!scene_.set_option(iter->first, iter->second)) {
+            map<string, Scene::Option>::const_iterator opt_iter = scene_.options().find(iter->first);
+
+            if (opt_iter == scene_.options().end()) {
+                Log::info("Warning: Scene '%s' doesn't accept option '%s'\n",
+                          scene_.name().c_str(), iter->first.c_str());
+            }
+            else {
+                Log::info("Warning: Scene '%s' doesn't accept value '%s' for option '%s'\n",
+                          scene_.name().c_str(), iter->second.c_str(), iter->first.c_str());
+            }
+        }
+    }
+}
+
diff --git a/src/benchmark.h b/src/benchmark.h
new file mode 100644
index 0000000..73bff5a
--- /dev/null
+++ b/src/benchmark.h
@@ -0,0 +1,126 @@
+/*
+ * Copyright © 2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis (glmark2)
+ */
+#ifndef GLMARK2_BENCHMARK_H_
+#define GLMARK2_BENCHMARK_H_
+
+#include <vector>
+#include <string>
+#include <map>
+
+#include "scene.h"
+
+/**
+ * A glmark2 benchmark.
+ *
+ * A benchmark is a Scene configured with a set of option values.
+ */
+class Benchmark
+{
+public:
+    typedef std::pair<std::string, std::string> OptionPair;
+
+    /**
+     * Creates a benchmark using a scene object reference.
+     *
+     * @param scene the scene to use
+     * @param options the options to use
+     */
+    Benchmark(Scene &scene, const std::vector<OptionPair> &options);
+
+    /**
+     * Creates a benchmark using a scene name.
+     *
+     * To use a scene by name, that scene must have been previously registered
+     * using ::register_scene().
+     *
+     * @param name the name of the scene to use
+     * @param options the options to use
+     */
+    Benchmark(const std::string &name, const std::vector<OptionPair> &options);
+
+    /**
+     * Creates a benchmark from a description string.
+     *
+     * The description string is of the form scene[:opt1=val1:opt2=val2...].
+     * The specified scene must have been previously registered using
+     * ::register_scene().
+     *
+     * @param s a description string
+     */
+    Benchmark(const std::string &s);
+
+    /**
+     * Gets the Scene associated with the benchmark.
+     *
+     * This method doesn't prepare the scene for a run.
+     * (See ::setup_scene())
+     *
+     * @return the Scene
+     */
+    Scene &scene() const { return scene_; }
+
+    /**
+     * Sets up the Scene associated with the benchmark.
+     *
+     * @return the Scene
+     */
+    Scene &setup_scene();
+
+    /**
+     * Tears down the Scene associated with the benchmark.
+     */
+    void teardown_scene();
+
+    /**
+     * Whether the benchmark needs extra decoration.
+     */
+    bool needs_decoration() const;
+
+    /**
+     * Registers a Scene, so that it becomes accessible by name.
+     */
+    static void register_scene(Scene &scene);
+
+    /**
+     * Gets a registered scene by its name.
+     *
+     * @return the Scene
+     */
+    static Scene &get_scene_by_name(const std::string &name);
+
+    /**
+     * Gets the registered scenes.
+     *
+     * @return the Scene
+     */
+    static const std::map<std::string, Scene *> &scenes() { return sceneMap_; }
+
+private:
+    Scene &scene_;
+    std::vector<OptionPair> options_;
+
+    void load_options();
+
+    static std::map<std::string, Scene *> sceneMap_;
+};
+
+#endif
diff --git a/src/canvas-android.cpp b/src/canvas-android.cpp
new file mode 100644
index 0000000..b06dc64
--- /dev/null
+++ b/src/canvas-android.cpp
@@ -0,0 +1,191 @@
+/*
+ * Copyright © 2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis (glmark2)
+ *  Jesse Barker
+ */
+#include "canvas-android.h"
+#include "log.h"
+#include "options.h"
+#include "gl-headers.h"
+#include <EGL/egl.h>
+
+#include <fstream>
+#include <sstream>
+
+/******************
+ * Public methods *
+ ******************/
+
+bool
+CanvasAndroid::init()
+{
+    EGLint attribs[] = {
+        EGL_CONFIG_ID, 0,
+        EGL_NONE
+    };
+
+    /* Get the current EGL config */
+    EGLDisplay egl_display(eglGetCurrentDisplay());
+    EGLContext egl_context(eglGetCurrentContext());
+    EGLConfig egl_config(0);
+    EGLint num_configs;
+
+    eglQueryContext(egl_display, egl_context, EGL_CONFIG_ID, &(attribs[1]));
+
+    eglChooseConfig(egl_display, attribs, &egl_config, 1, &num_configs);
+
+    resize(width_, height_);
+
+    if (!eglSwapInterval(egl_display, 0))
+        Log::info("** Failed to set swap interval. Results may be bounded above by refresh rate.\n");
+
+    init_gl_extensions();
+
+    glEnable(GL_DEPTH_TEST);
+    glDepthFunc(GL_LEQUAL);
+    glEnable(GL_CULL_FACE);
+    glCullFace(GL_BACK);
+
+    clear();
+
+    if (Options::show_debug) {
+        int buf, red, green, blue, alpha, depth, id, native_id;
+        eglGetConfigAttrib(egl_display, egl_config, EGL_CONFIG_ID, &id);
+        eglGetConfigAttrib(egl_display, egl_config, EGL_NATIVE_VISUAL_ID, &native_id);
+        eglGetConfigAttrib(egl_display, egl_config, EGL_BUFFER_SIZE, &buf);
+        eglGetConfigAttrib(egl_display, egl_config, EGL_RED_SIZE, &red);
+        eglGetConfigAttrib(egl_display, egl_config, EGL_GREEN_SIZE, &green);
+        eglGetConfigAttrib(egl_display, egl_config, EGL_BLUE_SIZE, &blue);
+        eglGetConfigAttrib(egl_display, egl_config, EGL_ALPHA_SIZE, &alpha);
+        eglGetConfigAttrib(egl_display, egl_config, EGL_DEPTH_SIZE, &depth);
+        Log::debug("EGL chosen config ID: 0x%x Native Visual ID: 0x%x\n"
+                   "  Buffer: %d bits\n"
+                   "     Red: %d bits\n"
+                   "   Green: %d bits\n"
+                   "    Blue: %d bits\n"
+                   "   Alpha: %d bits\n"
+                   "   Depth: %d bits\n",
+                   id, native_id,
+                   buf, red, green, blue, alpha, depth);
+    }
+
+    return true;
+}
+
+void
+CanvasAndroid::visible(bool visible)
+{
+    static_cast<void>(visible);
+}
+
+void
+CanvasAndroid::clear()
+{
+    glClearColor(0.0f, 0.0f, 0.0f, 0.5f);
+    glClearDepthf(1.0f);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+}
+
+void
+CanvasAndroid::update()
+{
+}
+
+void
+CanvasAndroid::print_info()
+{
+    std::stringstream ss;
+
+    ss << "    OpenGL Information" << std::endl;
+    ss << "    GL_VENDOR:     " << glGetString(GL_VENDOR) << std::endl;
+    ss << "    GL_RENDERER:   " << glGetString(GL_RENDERER) << std::endl;
+    ss << "    GL_VERSION:    " << glGetString(GL_VERSION) << std::endl;
+
+    Log::info("%s", ss.str().c_str());
+}
+
+Canvas::Pixel
+CanvasAndroid::read_pixel(int x, int y)
+{
+    uint8_t pixel[4];
+
+    glReadPixels(x, y, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, pixel);
+
+    return Canvas::Pixel(pixel[0], pixel[1], pixel[2], pixel[3]);
+}
+
+void
+CanvasAndroid::write_to_file(std::string &filename)
+{
+    char *pixels = new char[width_ * height_ * 4];
+
+    for (int i = 0; i < height_; i++) {
+        glReadPixels(0, i, width_, 1, GL_RGBA, GL_UNSIGNED_BYTE,
+                     &pixels[(height_ - i - 1) * width_ * 4]);
+    }
+
+    std::ofstream output (filename.c_str(), std::ios::out | std::ios::binary);
+    output.write(pixels, 4 * width_ * height_);
+
+    delete [] pixels;
+}
+
+bool
+CanvasAndroid::should_quit()
+{
+    return false;
+}
+
+void
+CanvasAndroid::resize(int width, int height)
+{
+    width_ = width;
+    height_ = height;
+
+    glViewport(0, 0, width_, height_);
+    projection_ = LibMatrix::Mat4::perspective(60.0, width_ / static_cast<float>(height_),
+                                               1.0, 1024.0);
+}
+
+/*******************
+ * Private methods *
+ *******************/
+
+void
+CanvasAndroid::init_gl_extensions()
+{
+    /*
+     * Parse the extensions we care about from the extension string.
+     * Don't even bother to get function pointers until we know the
+     * extension is present.
+     */
+    std::string extString;
+    const char* exts = reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS));
+    if (exts) {
+        extString = exts;
+    }
+
+    if (extString.find("GL_OES_mapbuffer") != std::string::npos) {
+        GLExtensions::MapBuffer =
+            reinterpret_cast<PFNGLMAPBUFFEROESPROC>(eglGetProcAddress("glMapBufferOES"));
+        GLExtensions::UnmapBuffer =
+            reinterpret_cast<PFNGLUNMAPBUFFEROESPROC>(eglGetProcAddress("glUnmapBufferOES"));
+    }
+}
diff --git a/src/canvas-android.h b/src/canvas-android.h
new file mode 100644
index 0000000..3749748
--- /dev/null
+++ b/src/canvas-android.h
@@ -0,0 +1,57 @@
+/*
+ * Copyright © 2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis (glmark2)
+ */
+#ifndef GLMARK2_CANVAS_ANDROID_H_
+#define GLMARK2_CANVAS_ANDROID_H_
+
+#include "canvas.h"
+
+/**
+ * Canvas for rendering to Android surfaces.
+ *
+ * This class doesn't perform any GLES2.0 surface and context management
+ * (contrary to the CanvasX11* classes); these are handled in the Java
+ * Android code.
+ */
+class CanvasAndroid : public Canvas
+{
+public:
+    CanvasAndroid(int width, int height) :
+        Canvas(width, height) {}
+    ~CanvasAndroid() {}
+
+    bool init();
+    void visible(bool visible);
+    void clear();
+    void update();
+    void print_info();
+    Pixel read_pixel(int x, int y);
+    void write_to_file(std::string &filename);
+    bool should_quit();
+    void resize(int width, int height);
+
+private:
+    void init_gl_extensions();
+};
+
+#endif
+
+
diff --git a/src/canvas-drm.cpp b/src/canvas-drm.cpp
new file mode 100644
index 0000000..7d11e85
--- /dev/null
+++ b/src/canvas-drm.cpp
@@ -0,0 +1,587 @@
+//
+// Copyright © 2012 Linaro Limited
+//
+// This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+//
+// glmark2 is free software: you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the Free Software
+// Foundation, either version 3 of the License, or (at your option) any later
+// version.
+//
+// glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+// details.
+//
+// You should have received a copy of the GNU General Public License along with
+// glmark2.  If not, see <http://www.gnu.org/licenses/>.
+//
+// Authors:
+//  Simon Que 
+//  Jesse Barker
+//
+#include "canvas-drm.h"
+#include "log.h"
+#include "options.h"
+#include "util.h"
+
+#include <fcntl.h>
+#include <poll.h>
+#include <signal.h>
+#include <string.h>
+#include <time.h>
+
+#include <fstream>
+#include <sstream>
+#include <list>
+
+/******************
+ * Public methods *
+ ******************/
+
+bool
+CanvasDRM::reset()
+{
+    if (!reset_context())
+        return false;
+
+    if (!make_current())
+        return false;
+
+    if (!supports_gl2()) {
+        Log::error("Glmark2 needs OpenGL(ES) version >= 2.0 to run"
+                   " (but version string is: '%s')!\n",
+                   glGetString(GL_VERSION));
+        return false;
+    }
+
+    glViewport(0, 0, width_, height_);
+    glEnable(GL_DEPTH_TEST);
+    glDepthFunc(GL_LEQUAL);
+    glEnable(GL_CULL_FACE);
+    glCullFace(GL_BACK);
+
+    clear();
+    egl_.swap();
+
+    if (!drm_.reset()) {
+        return false;
+    }
+
+    return true;
+}
+
+void
+DRMState::fb_destroy_callback(gbm_bo* bo, void* data)
+{
+    DRMFBState* fb = reinterpret_cast<DRMFBState*>(data);
+    if (fb && fb->fb_id) {
+        drmModeRmFB(fb->fd, fb->fb_id);
+    }
+    delete fb;
+    gbm_device* dev = gbm_bo_get_device(bo);
+    Log::debug("Got GBM device handle %p from buffer object\n", dev);
+}
+
+DRMFBState*
+DRMState::fb_get_from_bo(gbm_bo* bo)
+{
+    DRMFBState* fb = reinterpret_cast<DRMFBState*>(gbm_bo_get_user_data(bo));
+    if (fb) {
+        return fb;
+    }
+
+    unsigned int width = gbm_bo_get_width(bo);
+    unsigned int height = gbm_bo_get_height(bo);
+    unsigned int stride = gbm_bo_get_stride(bo);
+    unsigned int handle = gbm_bo_get_handle(bo).u32;
+    unsigned int fb_id(0);
+    int status = drmModeAddFB(fd_, width, height, 24, 32, stride, handle, &fb_id);
+    if (status < 0) {
+        Log::error("Failed to create FB: %d\n", status);
+        return 0;
+    }
+
+    fb = new DRMFBState();
+    fb->fd = fd_;
+    fb->bo = bo;
+    fb->fb_id = fb_id;
+
+    gbm_bo_set_user_data(bo, fb, fb_destroy_callback);
+    return fb;
+}
+
+bool
+DRMState::init_gbm()
+{
+    dev_ = gbm_create_device(fd_);
+    if (!dev_) {
+        Log::error("Failed to create GBM device\n");
+        return false;
+    }
+
+    surface_ = gbm_surface_create(dev_, mode_->hdisplay, mode_->vdisplay,
+                                  GBM_FORMAT_XRGB8888,
+                                  GBM_BO_USE_SCANOUT | GBM_BO_USE_RENDERING);
+    if (!surface_) {
+        Log::error("Failed to create GBM surface\n");
+        return false;
+    }
+
+    return true;
+}
+
+bool
+DRMState::init()
+{
+    // TODO: Replace this with something that explicitly probes for the loaded
+    // driver (udev?).
+    static const char* drm_modules[] = {
+        "i915",
+        "nouveau",
+        "radeon",
+        "vmgfx",
+        "omapdrm",
+        "exynos"
+    };
+
+    unsigned int num_modules(sizeof(drm_modules)/sizeof(drm_modules[0]));
+    for (unsigned int m = 0; m < num_modules; m++) {
+        fd_ = drmOpen(drm_modules[m], 0);
+        if (fd_ < 0) {
+            Log::debug("Failed to open DRM module '%s'\n", drm_modules[m]);
+            continue;
+        }
+        Log::debug("Opened DRM module '%s'\n", drm_modules[m]);
+        break;
+    }
+
+    if (fd_ < 0) {
+        Log::error("Failed to find a suitable DRM device\n");
+        return false;
+    }
+
+    resources_ = drmModeGetResources(fd_);
+    if (!resources_) {
+        Log::error("drmModeGetResources failed\n");
+        return false;
+    }
+
+    // Find a connected connector
+    for (int c = 0; c < resources_->count_connectors; c++) {
+        connector_ = drmModeGetConnector(fd_, resources_->connectors[c]);
+        if (DRM_MODE_CONNECTED == connector_->connection) {
+            break;
+        }
+        drmModeFreeConnector(connector_);
+        connector_ = 0;
+    }
+
+    if (!connector_) {
+        Log::error("Failed to find a suitable connector\n");
+        return false;
+    }
+
+    // Find the best resolution (we will always operate full-screen).
+    unsigned int bestArea(0);
+    for (int m = 0; m < connector_->count_modes; m++) {
+        drmModeModeInfo* curMode = &connector_->modes[m];
+        unsigned int curArea = curMode->hdisplay * curMode->vdisplay;
+        if (curArea > bestArea) {
+            mode_ = curMode;
+            bestArea = curArea;
+        }
+    }
+
+    if (!mode_) {
+        Log::error("Failed to find a suitable mode\n");
+        return false;
+    }
+
+    // Find a suitable encoder
+    for (int e = 0; e < resources_->count_encoders; e++) {
+        encoder_ = drmModeGetEncoder(fd_, resources_->encoders[e]);
+        if (encoder_ && encoder_->encoder_id == connector_->encoder_id) {
+            break;
+        }
+        drmModeFreeEncoder(encoder_);
+        encoder_ = 0;
+    }
+
+    if (!encoder_) {
+        Log::error("Failed to find a suitable encoder\n");
+        return false;
+    }
+
+    if (!init_gbm()) {
+        return false;
+    }
+
+    crtc_ = drmModeGetCrtc(fd_, encoder_->crtc_id);
+    if (!crtc_) {
+        Log::error("Failed to get current CRTC\n");
+        return false;
+    }
+
+    signal(SIGINT, &DRMState::quit_handler);
+
+    return true;
+}
+
+bool
+DRMState::reset()
+{
+    if (bo_) {
+        gbm_surface_release_buffer(surface_, bo_);
+    }
+
+    bo_ = gbm_surface_lock_front_buffer(surface_);
+    fb_ = fb_get_from_bo(bo_);
+
+    int status = drmModeSetCrtc(fd_, encoder_->crtc_id, fb_->fb_id, 0, 0,
+                                &connector_->connector_id, 1, mode_);
+    if (status < 0) {
+        Log::error("Failed to set CRTC: %d\n", status);
+        return false;
+    }
+
+    return true;
+}
+
+
+bool DRMState::should_quit_ = false;
+
+void
+DRMState::quit_handler(int signo)
+{
+    Log::debug("Got SIGINT (%d).\n", signo);
+    should_quit_ = true;
+}
+void
+DRMState::page_flip_handler(int fd, unsigned int frame, unsigned int sec, unsigned int usec, void* data)
+{
+    unsigned int* waiting = reinterpret_cast<unsigned int*>(data);
+    *waiting = 0;
+    // Deal with unused parameters
+    static_cast<void>(fd);
+    static_cast<void>(frame);
+    static_cast<void>(sec);
+    static_cast<void>(usec);
+}
+
+void
+DRMState::do_flip()
+{
+    gbm_bo* next = gbm_surface_lock_front_buffer(surface_);
+    fb_ = fb_get_from_bo(next);
+    unsigned int waiting(1);
+    int status = drmModePageFlip(fd_, encoder_->crtc_id, fb_->fb_id,
+                                 DRM_MODE_PAGE_FLIP_EVENT, &waiting);
+    if (status < 0) {
+        Log::error("Failed to enqueue page flip: %d\n", status);
+        return;
+    }
+
+    fd_set fds;
+    FD_ZERO(&fds);
+    FD_SET(fd_, &fds);
+    drmEventContext evCtx;
+    evCtx.version = DRM_EVENT_CONTEXT_VERSION;
+    evCtx.page_flip_handler = page_flip_handler;
+
+    while (waiting) {
+        status = select(fd_ + 1, &fds, 0, 0, 0);
+        if (status < 0) {
+            // Most of the time, select() will return an error because the
+            // user pressed Ctrl-C.  So, only print out a message in debug
+            // mode, and just check for the likely condition and release
+            // the current buffer object before getting out.
+            Log::debug("Error in select\n");
+            if (should_quit()) {
+                gbm_surface_release_buffer(surface_, bo_);
+                bo_ = next;
+            }
+            return;
+        }
+        drmHandleEvent(fd_, &evCtx);
+    }
+
+    gbm_surface_release_buffer(surface_, bo_);
+    bo_ = next;
+}
+
+void
+DRMState::cleanup()
+{
+    // Restore CRTC state if necessary
+    if (crtc_) {
+        int status = drmModeSetCrtc(fd_, crtc_->crtc_id, crtc_->buffer_id,
+                                    crtc_->x, crtc_->y, &connector_->connector_id,
+                                    1, &crtc_->mode);
+        if (status < 0) {
+            Log::error("Failed to restore original CRTC: %d\n", status);
+        }
+        drmModeFreeCrtc(crtc_);
+        crtc_ = 0;
+    }
+    if (surface_) {
+        gbm_surface_destroy(surface_);
+        surface_ = 0;
+    }
+    if (dev_) {
+        gbm_device_destroy(dev_);
+        dev_ = 0;
+    }
+    if (connector_) {
+        drmModeFreeConnector(connector_);
+        connector_ = 0;
+    }
+    if (encoder_) {
+        drmModeFreeEncoder(encoder_);
+        encoder_ = 0;
+    }
+    if (resources_) {
+        drmModeFreeResources(resources_);
+        resources_ = 0;
+    }
+    if (fd_ > 0) {
+        drmClose(fd_);
+    }
+    fd_ = 0;
+    mode_ = 0;
+}
+
+bool
+CanvasDRM::init()
+{
+    Log::info("NOTE: The DRM canvas is still experimental and its behavior\n");
+    Log::info("      is subject to change as GBM and modesetting behavior\n");
+    Log::info("      evolves\n");
+
+    if (!drm_.init()) {
+        Log::error("Failed to initialize the DRM canvas\n");
+        drm_.cleanup();
+        return false;
+    }
+
+    width_ = drm_.mode_width();
+    height_ = drm_.mode_height();
+    resize_no_viewport(width_, height_);
+
+    if (!egl_.init_display(drm_.device(), visual_config_)) {
+        return false;
+    }
+    if (!egl_.init_surface(drm_.surface())) {
+        return false;
+    }
+    if (!egl_.valid()) {
+        return false;
+    }
+
+    return reset();
+}
+
+
+CanvasDRM::~CanvasDRM()
+{
+    drm_.cleanup();
+}
+
+void
+CanvasDRM::visible(bool /* visible */)
+{
+}
+
+void
+CanvasDRM::clear()
+{
+    glClearColor(0.0f, 0.0f, 0.0f, 0.5f);
+#if USE_GL
+    glClearDepth(1.0f);
+#elif USE_GLESv2
+    glClearDepthf(1.0f);
+#endif
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+}
+
+void
+CanvasDRM::update()
+{
+    Options::FrameEnd m = Options::frame_end;
+
+    if (m == Options::FrameEndDefault) {
+        if (offscreen_)
+            m = Options::FrameEndFinish;
+        else
+            m = Options::FrameEndSwap;
+    }
+
+    switch(m) {
+        case Options::FrameEndSwap:
+            swap_buffers();
+            break;
+        case Options::FrameEndFinish:
+            glFinish();
+            break;
+        case Options::FrameEndReadPixels:
+            read_pixel(width_ / 2, height_ / 2);
+            break;
+        case Options::FrameEndNone:
+        default:
+            break;
+    }
+}
+
+void
+CanvasDRM::print_info()
+{
+    make_current();
+
+    std::stringstream ss;
+    ss << "    OpenGL Information" << std::endl;
+    ss << "    GL_VENDOR:     " << glGetString(GL_VENDOR) << std::endl;
+    ss << "    GL_RENDERER:   " << glGetString(GL_RENDERER) << std::endl;
+    ss << "    GL_VERSION:    " << glGetString(GL_VERSION) << std::endl;
+    Log::info("%s", ss.str().c_str());
+}
+
+Canvas::Pixel
+CanvasDRM::read_pixel(int x, int y)
+{
+    uint8_t pixel[4];
+    glReadPixels(x, y, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, pixel);
+    return Canvas::Pixel(pixel[0], pixel[1], pixel[2], pixel[3]);
+}
+
+void
+CanvasDRM::write_to_file(std::string &filename)
+{
+    char *pixels = new char[width_ * height_ * 4];
+
+    for (int i = 0; i < height_; i++) {
+        glReadPixels(0, i, width_, 1, GL_RGBA, GL_UNSIGNED_BYTE,
+                     &pixels[(height_ - i - 1) * width_ * 4]);
+    }
+
+    std::ofstream output (filename.c_str(), std::ios::out | std::ios::binary);
+    output.write(pixels, 4 * width_ * height_);
+
+    delete [] pixels;
+}
+
+bool
+CanvasDRM::should_quit()
+{
+    return drm_.should_quit();
+}
+
+void
+CanvasDRM::resize(int width, int height)
+{
+    resize_no_viewport(width, height);
+    glViewport(0, 0, width_, height_);
+}
+
+/*********************
+ * Protected methods *
+ *********************/
+
+bool
+CanvasDRM::supports_gl2()
+{
+    std::string gl_version_str(
+        reinterpret_cast<const char*>(glGetString(GL_VERSION)));
+    int gl_major = 0;
+
+    size_t point_pos(gl_version_str.find('.'));
+
+    if (point_pos != std::string::npos) {
+        point_pos--;
+
+        size_t start_pos(gl_version_str.rfind(' ', point_pos));
+        if (start_pos == std::string::npos)
+            start_pos = 0;
+        else
+            start_pos++;
+
+        gl_major = Util::fromString<int>(
+                gl_version_str.substr(start_pos, point_pos - start_pos + 1)
+                );
+    }
+
+    return gl_major >= 2;
+}
+
+bool
+CanvasDRM::make_current()
+{
+    if (!egl_.valid()) {
+        Log::error("CanvasDRM: Invalid EGL state\n");
+        return false;
+    }
+
+    init_gl_extensions();
+
+    return true;
+}
+
+bool
+CanvasDRM::reset_context()
+{
+    return egl_.reset();
+}
+
+void
+CanvasDRM::swap_buffers()
+{
+    egl_.swap();
+    drm_.do_flip();
+}
+
+void
+CanvasDRM::init_gl_extensions()
+{
+#if USE_GLESv2
+    /*
+     * Parse the extensions we care about from the extension string.
+     * Don't even bother to get function pointers until we know the
+     * extension is present.
+     */
+    std::string extString;
+    const char* exts =
+        reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS));
+    if (exts)
+        extString = exts;
+
+    if (extString.find("GL_OES_mapbuffer") != std::string::npos) {
+        GLExtensions::MapBuffer = reinterpret_cast<PFNGLMAPBUFFEROESPROC>(
+            eglGetProcAddress("glMapBufferOES"));
+        GLExtensions::UnmapBuffer = reinterpret_cast<PFNGLUNMAPBUFFEROESPROC>(
+            eglGetProcAddress("glUnmapBufferOES"));
+    }
+#elif USE_GL
+    GLExtensions::MapBuffer = glMapBuffer;
+    GLExtensions::UnmapBuffer = glUnmapBuffer;
+#endif
+}
+
+
+/*******************
+ * Private methods *
+ *******************/
+
+void
+CanvasDRM::resize_no_viewport(int width, int height)
+{
+    width_ = drm_.mode_width();
+    height_ = drm_.mode_height();
+
+    if (!width_)
+        width_ = width;
+    if (!height_)
+        height_ = height;
+
+    projection_ =
+        LibMatrix::Mat4::perspective(60.0, width_ / static_cast<float>(height_),
+                                     1.0, 1024.0);
+}
diff --git a/src/canvas-drm.h b/src/canvas-drm.h
new file mode 100644
index 0000000..e355131
--- /dev/null
+++ b/src/canvas-drm.h
@@ -0,0 +1,132 @@
+//
+// Copyright © 2012 Linaro Limited
+//
+// This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+//
+// glmark2 is free software: you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the Free Software
+// Foundation, either version 3 of the License, or (at your option) any later
+// version.
+//
+// glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+// details.
+//
+// You should have received a copy of the GNU General Public License along with
+// glmark2.  If not, see <http://www.gnu.org/licenses/>.
+//
+// Authors:
+//  Simon Que 
+//  Jesse Barker
+//
+#ifndef GLMARK2_CANVAS_DRM_H_
+#define GLMARK2_CANVAS_DRM_H_
+
+#include <cstring>
+#include <gbm.h>
+#include <drm.h>
+#include <xf86drm.h>
+#include <xf86drmMode.h>
+
+#include "canvas.h"
+#include "egl-state.h"
+
+struct DRMFBState
+{
+    int fd;
+    gbm_bo* bo;
+    uint32_t fb_id;
+};
+
+class DRMState
+{
+    static void page_flip_handler(int fd, unsigned int frame, unsigned int sec,
+                                  unsigned int usec, void* data);
+    static void fb_destroy_callback(gbm_bo* bo, void* data);
+    static void quit_handler(int signum);
+    static bool should_quit_;
+    DRMFBState* fb_get_from_bo(gbm_bo* bo);
+    bool init_gbm();
+    int fd_;
+    drmModeRes* resources_;
+    drmModeConnector* connector_;
+    drmModeEncoder* encoder_;
+    drmModeCrtcPtr crtc_;
+    drmModeModeInfo* mode_;
+    gbm_device* dev_;
+    gbm_surface* surface_;
+    gbm_bo* bo_;
+    DRMFBState* fb_;
+
+public:
+    DRMState() :
+        fd_(0),
+        resources_(0),
+        connector_(0),
+        encoder_(0),
+        mode_(0),
+        dev_(0),
+        surface_(0),
+        bo_(0),
+        fb_(0) {}
+    ~DRMState() { cleanup(); }
+    void cleanup();
+    bool init();
+    bool reset();
+    void do_flip();
+    bool should_quit() const { return should_quit_; }
+    gbm_device* device() const { return dev_; }
+    gbm_surface* surface() const { return surface_; }
+    unsigned int mode_width() const
+    { 
+        if (mode_) {
+            return mode_->hdisplay;
+        }
+        return 0;
+    }
+    unsigned int mode_height() const
+    {
+        if (mode_) {
+            return mode_->vdisplay;
+        }
+        return 0;
+    }
+};
+
+/**
+ * Canvas for direct rendering with EGL.
+ */
+class CanvasDRM: public Canvas
+{
+public:
+    CanvasDRM(int width, int height) :
+        Canvas(width, height) {}
+    ~CanvasDRM();
+
+    virtual bool init();
+    virtual bool reset();
+    virtual void visible(bool visible);
+    virtual void clear();
+    virtual void update();
+    virtual void print_info();
+    virtual Pixel read_pixel(int x, int y);
+    virtual void write_to_file(std::string &filename);
+    virtual bool should_quit();
+    virtual void resize(int width, int height);
+
+protected:
+    virtual bool make_current();
+    virtual bool reset_context();
+    virtual void swap_buffers();
+    virtual bool supports_gl2();
+
+private:
+    DRMState drm_;
+    EGLState egl_;
+
+    void resize_no_viewport(int width, int height);
+    void init_gl_extensions();
+};
+
+#endif
diff --git a/src/canvas-x11-egl.cpp b/src/canvas-x11-egl.cpp
new file mode 100644
index 0000000..f7e548b
--- /dev/null
+++ b/src/canvas-x11-egl.cpp
@@ -0,0 +1,117 @@
+/*
+ * Copyright © 2010-2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis (glmark2)
+ */
+#include "canvas-x11-egl.h"
+#include "log.h"
+#include "options.h"
+
+#include <fstream>
+#include <sstream>
+#include <climits>
+
+/*********************
+ * Protected methods *
+ *********************/
+
+bool
+CanvasX11EGL::init_gl_winsys()
+{
+    egl_.init_display(xdpy_, visual_config_);
+    return true;
+}
+
+XVisualInfo *
+CanvasX11EGL::get_xvisualinfo()
+{
+    XVisualInfo vis_tmpl;
+    XVisualInfo *vis_info;
+    int num_visuals;
+    EGLint vid;
+
+    if (!egl_.gotNativeConfig(vid))
+    {
+        Log::error("Failed to get a native-renderable EGLConfig\n");
+        return 0;
+    }
+
+    /* The X window visual must match the EGL config */
+    vis_tmpl.visualid = vid;
+    vis_info = XGetVisualInfo(xdpy_, VisualIDMask, &vis_tmpl,
+                             &num_visuals);
+    if (!vis_info) {
+        Log::error("couldn't get X visual\n");
+        return 0;
+    }
+
+    return vis_info;
+}
+
+bool
+CanvasX11EGL::make_current()
+{
+    egl_.init_surface(xwin_);
+    if (!egl_.valid()) {
+        Log::error("CanvasX11EGL: Invalid EGL state\n");
+        return false;
+    }
+
+    init_gl_extensions();
+
+    return true;
+}
+
+void
+CanvasX11EGL::swap_buffers()
+{
+    egl_.swap();
+}
+
+void
+CanvasX11EGL::get_glvisualconfig(GLVisualConfig &visual_config)
+{
+    egl_.getVisualConfig(visual_config);
+}
+
+/*******************
+ * Private methods *
+ *******************/
+
+bool
+CanvasX11EGL::reset_context()
+{
+    return egl_.reset();
+}
+
+void
+CanvasX11EGL::init_gl_extensions()
+{
+#if USE_GLESv2
+    if (GLExtensions::support("GL_OES_mapbuffer")) {
+        GLExtensions::MapBuffer =
+            reinterpret_cast<PFNGLMAPBUFFEROESPROC>(eglGetProcAddress("glMapBufferOES"));
+        GLExtensions::UnmapBuffer =
+            reinterpret_cast<PFNGLUNMAPBUFFEROESPROC>(eglGetProcAddress("glUnmapBufferOES"));
+    }
+#elif USE_GL
+    GLExtensions::MapBuffer = glMapBuffer;
+    GLExtensions::UnmapBuffer = glUnmapBuffer;
+#endif
+}
diff --git a/src/canvas-x11-egl.h b/src/canvas-x11-egl.h
new file mode 100644
index 0000000..d5f581c
--- /dev/null
+++ b/src/canvas-x11-egl.h
@@ -0,0 +1,52 @@
+/*
+ * Copyright © 2010-2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis (glmark2)
+ *  Jesse Barker
+ */
+#ifndef GLMARK2_CANVAS_X11_EGL_H_
+#define GLMARK2_CANVAS_X11_EGL_H_
+
+#include "canvas-x11.h"
+#include "egl-state.h"
+
+/**
+ * Canvas for rendering to an X11 window using EGL.
+ */
+class CanvasX11EGL : public CanvasX11
+{
+public:
+    CanvasX11EGL(int width, int height) :
+        CanvasX11(width, height) {}
+    ~CanvasX11EGL() {}
+
+protected:
+    XVisualInfo *get_xvisualinfo();
+    bool make_current();
+    bool reset_context();
+    void swap_buffers();
+    void get_glvisualconfig(GLVisualConfig &visual_config);
+    bool init_gl_winsys();
+
+private:
+    void init_gl_extensions();
+    EGLState egl_;
+};
+
+#endif
diff --git a/src/canvas-x11-glx.cpp b/src/canvas-x11-glx.cpp
new file mode 100644
index 0000000..db016b8
--- /dev/null
+++ b/src/canvas-x11-glx.cpp
@@ -0,0 +1,308 @@
+/*
+ * Copyright © 2010-2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis (glmark2)
+ */
+#include "canvas-x11-glx.h"
+#include "log.h"
+#include "options.h"
+
+#include <string>
+#include <climits>
+
+static PFNGLXSWAPINTERVALEXTPROC glXSwapIntervalEXT_;
+static PFNGLXSWAPINTERVALMESAPROC glXSwapIntervalMESA_;
+static PFNGLXGETSWAPINTERVALMESAPROC glXGetSwapIntervalMESA_;
+
+/*********************
+ * Protected methods *
+ *********************/
+
+XVisualInfo *
+CanvasX11GLX::get_xvisualinfo()
+{
+    if (!ensure_glx_fbconfig())
+        return 0;
+
+    XVisualInfo *vis_info = glXGetVisualFromFBConfig(xdpy_, glx_fbconfig_ );
+
+    return vis_info;
+}
+
+bool
+CanvasX11GLX::make_current()
+{
+    if (!ensure_glx_context())
+        return false;
+
+    if (glx_context_ == glXGetCurrentContext())
+        return true;
+
+    init_extensions();
+
+    if (!glXMakeCurrent(xdpy_, xwin_, glx_context_)) {
+        Log::error("glXMakeCurrent failed\n");
+        return false;
+    }
+
+    unsigned int desired_swap(0);
+    unsigned int actual_swap(-1);
+    if (glXSwapIntervalEXT_) {
+        glXSwapIntervalEXT_(xdpy_, xwin_, desired_swap);
+        glXQueryDrawable(xdpy_, xwin_, GLX_SWAP_INTERVAL_EXT, &actual_swap);
+        if (actual_swap == desired_swap)
+            return true;
+    }
+
+    if (glXSwapIntervalMESA_) {
+        glXSwapIntervalMESA_(desired_swap);
+        actual_swap = glXGetSwapIntervalMESA_();
+        if (actual_swap == desired_swap)
+            return true;
+    }
+
+    Log::info("** Failed to set swap interval. Results may be bounded above by refresh rate.\n");
+
+    return true;
+}
+
+void
+CanvasX11GLX::get_glvisualconfig(GLVisualConfig &visual_config)
+{
+    if (!ensure_glx_fbconfig())
+        return;
+
+    get_glvisualconfig_glx(glx_fbconfig_, visual_config);
+}
+
+/*******************
+ * Private methods *
+ *******************/
+
+bool
+CanvasX11GLX::check_glx_version()
+{
+    int glx_major, glx_minor;
+
+    if (!glXQueryVersion(xdpy_, &glx_major, &glx_minor ) ||
+        (glx_major == 1  && glx_minor < 3) || glx_major < 1)
+    {
+        Log::error("GLX version >= 1.3 is required\n");
+        return false;
+    }
+
+    return true;
+}
+
+void
+CanvasX11GLX::init_extensions()
+{
+    /*
+     * Parse the extensions we care about from the extension string.
+     * Don't even bother to get function pointers until we know the
+     * extension is present.
+     */
+    std::string extString;
+    const char* exts = glXQueryExtensionsString(xdpy_, 0);
+    if (exts) {
+        extString = exts;
+    }
+
+    /*
+     * GLX_EXT_swap_control or GL_MESA_swap_control. Note that
+     * GLX_SGI_swap_control is not enough because it doesn't allow 0 as a valid
+     * value (i.e. you can't turn off VSync).
+     */
+    if (extString.find("GLX_EXT_swap_control") != std::string::npos) {
+        glXSwapIntervalEXT_ =
+            reinterpret_cast<PFNGLXSWAPINTERVALEXTPROC>(
+                glXGetProcAddress(
+                    reinterpret_cast<const GLubyte *>("glXSwapIntervalEXT")
+                )
+            );
+    }
+    else if (extString.find("GLX_MESA_swap_control") != std::string::npos) {
+        glXSwapIntervalMESA_ =
+            reinterpret_cast<PFNGLXSWAPINTERVALMESAPROC>(
+                glXGetProcAddress(
+                    reinterpret_cast<const GLubyte *>("glXSwapIntervalMESA")
+                )
+            );
+        glXGetSwapIntervalMESA_ =
+            reinterpret_cast<PFNGLXGETSWAPINTERVALMESAPROC>(
+                glXGetProcAddress(
+                    reinterpret_cast<const GLubyte *>("glXGetSwapIntervalMESA")
+                )
+            );
+    }
+
+
+    if (!glXSwapIntervalEXT_ && !glXSwapIntervalMESA_) {
+        Log::info("** GLX does not support GLX_EXT_swap_control or GLX_MESA_swap_control!\n");
+    }
+}
+
+bool
+CanvasX11GLX::ensure_glx_fbconfig()
+{
+    static int attribs[] = {
+        GLX_X_RENDERABLE, True,
+        GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT,
+        GLX_RENDER_TYPE, GLX_RGBA_BIT,
+        GLX_X_VISUAL_TYPE, GLX_TRUE_COLOR,
+        GLX_RED_SIZE, visual_config_.red,
+        GLX_GREEN_SIZE, visual_config_.green,
+        GLX_BLUE_SIZE, visual_config_.blue,
+        GLX_ALPHA_SIZE, visual_config_.alpha,
+        GLX_DEPTH_SIZE, visual_config_.depth,
+        GLX_STENCIL_SIZE, visual_config_.stencil,
+        GLX_BUFFER_SIZE, visual_config_.buffer,
+        GLX_DOUBLEBUFFER, True,
+        None
+    };
+    int num_configs;
+
+    if (glx_fbconfig_)
+        return true;
+
+    if (!check_glx_version())
+        return false;
+
+    GLXFBConfig *fbc = glXChooseFBConfig(xdpy_, DefaultScreen(xdpy_),
+                                         attribs, &num_configs);
+    if (!fbc) {
+        Log::error("glXChooseFBConfig() failed\n");
+        return false;
+    }
+
+    std::vector<GLXFBConfig> configs(fbc, fbc + num_configs);
+
+    Log::debug("Found %d matching FB configs.\n", num_configs);
+
+    /* Select the best matching config */
+    glx_fbconfig_ = select_best_config(configs);
+
+    XFree(fbc);
+
+    if (Options::show_debug) {
+        int buf, red, green, blue, alpha, depth, stencil, id, native_id;
+        glXGetFBConfigAttrib(xdpy_, glx_fbconfig_, GLX_FBCONFIG_ID, &id);
+        glXGetFBConfigAttrib(xdpy_, glx_fbconfig_, GLX_VISUAL_ID, &native_id);
+        glXGetFBConfigAttrib(xdpy_, glx_fbconfig_, GLX_BUFFER_SIZE, &buf);
+        glXGetFBConfigAttrib(xdpy_, glx_fbconfig_, GLX_RED_SIZE, &red);
+        glXGetFBConfigAttrib(xdpy_, glx_fbconfig_, GLX_GREEN_SIZE, &green);
+        glXGetFBConfigAttrib(xdpy_, glx_fbconfig_, GLX_BLUE_SIZE, &blue);
+        glXGetFBConfigAttrib(xdpy_, glx_fbconfig_, GLX_ALPHA_SIZE, &alpha);
+        glXGetFBConfigAttrib(xdpy_, glx_fbconfig_, GLX_DEPTH_SIZE, &depth);
+        glXGetFBConfigAttrib(xdpy_, glx_fbconfig_, GLX_STENCIL_SIZE, &stencil);
+        Log::debug("GLX chosen config ID: 0x%x Native Visual ID: 0x%x\n"
+                   "  Buffer: %d bits\n"
+                   "     Red: %d bits\n"
+                   "   Green: %d bits\n"
+                   "    Blue: %d bits\n"
+                   "   Alpha: %d bits\n"
+                   "   Depth: %d bits\n"
+                   " Stencil: %d bits\n",
+                   id, native_id,
+                   buf, red, green, blue, alpha, depth, stencil);
+    }
+
+
+    return true;
+}
+
+void
+CanvasX11GLX::init_gl_extensions()
+{
+    GLExtensions::MapBuffer = glMapBuffer;
+    GLExtensions::UnmapBuffer = glUnmapBuffer;
+}
+
+bool
+CanvasX11GLX::reset_context()
+{
+    glXDestroyContext(xdpy_, glx_context_);
+    glx_context_ = 0;
+
+    return true;
+}
+
+bool
+CanvasX11GLX::ensure_glx_context()
+{
+    if (glx_context_)
+        return true;
+
+    if (!ensure_glx_fbconfig())
+        return false;
+
+    glx_context_ = glXCreateNewContext(xdpy_, glx_fbconfig_, GLX_RGBA_TYPE,
+                                       0, True);
+    if (!glx_context_) {
+        Log::error("glXCreateNewContext failed\n");
+        return false;
+    }
+
+    init_gl_extensions();
+
+    return true;
+}
+
+void
+CanvasX11GLX::get_glvisualconfig_glx(const GLXFBConfig config, GLVisualConfig &visual_config)
+{
+    glXGetFBConfigAttrib(xdpy_, config, GLX_BUFFER_SIZE, &visual_config.buffer);
+    glXGetFBConfigAttrib(xdpy_, config, GLX_RED_SIZE, &visual_config.red);
+    glXGetFBConfigAttrib(xdpy_, config, GLX_GREEN_SIZE, &visual_config.green);
+    glXGetFBConfigAttrib(xdpy_, config, GLX_BLUE_SIZE, &visual_config.blue);
+    glXGetFBConfigAttrib(xdpy_, config, GLX_ALPHA_SIZE, &visual_config.alpha);
+    glXGetFBConfigAttrib(xdpy_, config, GLX_DEPTH_SIZE, &visual_config.depth);
+    glXGetFBConfigAttrib(xdpy_, config, GLX_STENCIL_SIZE, &visual_config.stencil);
+}
+
+GLXFBConfig
+CanvasX11GLX::select_best_config(std::vector<GLXFBConfig> configs)
+{
+    int best_score(INT_MIN);
+    GLXFBConfig best_config(0);
+
+    /*
+     * Go through all the configs and choose the one with the best score,
+     * i.e., the one better matching the requested config.
+     */
+    for (std::vector<GLXFBConfig>::const_iterator iter = configs.begin();
+         iter != configs.end();
+         iter++)
+    {
+        const GLXFBConfig config(*iter);
+        GLVisualConfig vc;
+        int score;
+
+        get_glvisualconfig_glx(config, vc);
+
+        score = vc.match_score(visual_config_);
+
+        if (score > best_score) {
+            best_score = score;
+            best_config = config;
+        }
+    }
+
+    return best_config;
+}
diff --git a/src/canvas-x11-glx.h b/src/canvas-x11-glx.h
new file mode 100644
index 0000000..f787087
--- /dev/null
+++ b/src/canvas-x11-glx.h
@@ -0,0 +1,65 @@
+/*
+ * Copyright © 2010-2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis (glmark2)
+ */
+#ifndef GLMARK2_CANVAS_X11_GLX_H_
+#define GLMARK2_CANVAS_X11_GLX_H_
+
+#include "canvas-x11.h"
+
+#define GLX_GLXEXT_PROTOTYPES
+#include <GL/glx.h>
+#include <GL/glxext.h>
+#include <vector>
+
+/**
+ * Canvas for rendering to an X11 window using GLX.
+ */
+class CanvasX11GLX : public CanvasX11
+{
+public:
+    CanvasX11GLX(int width, int height) :
+        CanvasX11(width, height), glx_fbconfig_(0), glx_context_(0) {}
+    ~CanvasX11GLX() {}
+
+protected:
+    XVisualInfo *get_xvisualinfo();
+    bool make_current();
+    bool reset_context();
+    void swap_buffers() { glXSwapBuffers(xdpy_, xwin_); }
+    void get_glvisualconfig(GLVisualConfig &visual_config);
+    bool init_gl_winsys() { return true; }
+
+private:
+    bool check_glx_version();
+    void init_extensions();
+    bool ensure_glx_fbconfig();
+    bool ensure_glx_context();
+    void init_gl_extensions();
+    void get_glvisualconfig_glx(GLXFBConfig config, GLVisualConfig &visual_config);
+    GLXFBConfig select_best_config(std::vector<GLXFBConfig> configs);
+
+    GLXFBConfig glx_fbconfig_;
+    GLXContext glx_context_;
+
+};
+
+#endif
+
diff --git a/src/canvas-x11.cpp b/src/canvas-x11.cpp
new file mode 100644
index 0000000..c1b19c0
--- /dev/null
+++ b/src/canvas-x11.cpp
@@ -0,0 +1,526 @@
+/*
+ * Copyright © 2010-2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis (glmark2)
+ *  Jesse Barker
+ */
+#include "canvas-x11.h"
+#include "log.h"
+#include "options.h"
+#include "util.h"
+
+#include <X11/keysym.h>
+#include <X11/Xatom.h>
+#include <fstream>
+#include <sstream>
+
+/******************
+ * Public methods *
+ ******************/
+bool
+CanvasX11::reset()
+{
+    release_fbo();
+
+    if (!reset_context())
+        return false;
+
+    if (!do_make_current())
+        return false;
+
+    if (!supports_gl2()) {
+        Log::error("Glmark2 needs OpenGL(ES) version >= 2.0 to run"
+                   " (but version string is: '%s')!\n",
+                   glGetString(GL_VERSION));
+        return false;
+    }
+
+    glViewport(0, 0, width_, height_);
+
+    glEnable(GL_DEPTH_TEST);
+    glDepthFunc(GL_LEQUAL);
+    glEnable(GL_CULL_FACE);
+    glCullFace(GL_BACK);
+
+    clear();
+
+    return true;
+}
+
+bool
+CanvasX11::init()
+{
+    xdpy_ = XOpenDisplay(NULL);
+    if (!xdpy_)
+        return false;
+
+    if (!init_gl_winsys())
+        return false;
+
+    resize_no_viewport(width_, height_);
+
+    if (!xwin_)
+        return false;
+
+    return reset();
+}
+
+void
+CanvasX11::visible(bool visible)
+{
+    if (visible && !offscreen_)
+        XMapWindow(xdpy_, xwin_);
+}
+
+void
+CanvasX11::clear()
+{
+    glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
+#if USE_GL
+    glClearDepth(1.0f);
+#elif USE_GLESv2
+    glClearDepthf(1.0f);
+#endif
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+}
+
+void
+CanvasX11::update()
+{
+    Options::FrameEnd m = Options::frame_end;
+
+    if (m == Options::FrameEndDefault) {
+        if (offscreen_)
+            m = Options::FrameEndFinish;
+        else
+            m = Options::FrameEndSwap;
+    }
+
+    switch(m) {
+        case Options::FrameEndSwap:
+            swap_buffers();
+            break;
+        case Options::FrameEndFinish:
+            glFinish();
+            break;
+        case Options::FrameEndReadPixels:
+            read_pixel(width_ / 2, height_ / 2);
+            break;
+        case Options::FrameEndNone:
+        default:
+            break;
+    }
+}
+
+void
+CanvasX11::print_info()
+{
+    do_make_current();
+
+    std::stringstream ss;
+
+    ss << "    OpenGL Information" << std::endl;
+    ss << "    GL_VENDOR:     " << glGetString(GL_VENDOR) << std::endl;
+    ss << "    GL_RENDERER:   " << glGetString(GL_RENDERER) << std::endl;
+    ss << "    GL_VERSION:    " << glGetString(GL_VERSION) << std::endl;
+
+    Log::info("%s", ss.str().c_str());
+}
+
+Canvas::Pixel
+CanvasX11::read_pixel(int x, int y)
+{
+    uint8_t pixel[4];
+
+    glReadPixels(x, y, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, pixel);
+
+    return Canvas::Pixel(pixel[0], pixel[1], pixel[2], pixel[3]);
+}
+
+void
+CanvasX11::write_to_file(std::string &filename)
+{
+    char *pixels = new char[width_ * height_ * 4];
+
+    for (int i = 0; i < height_; i++) {
+        glReadPixels(0, i, width_, 1, GL_RGBA, GL_UNSIGNED_BYTE,
+                     &pixels[(height_ - i - 1) * width_ * 4]);
+    }
+
+    std::ofstream output (filename.c_str(), std::ios::out | std::ios::binary);
+    output.write(pixels, 4 * width_ * height_);
+
+    delete [] pixels;
+}
+
+bool
+CanvasX11::should_quit()
+{
+    XEvent event;
+
+    if (!XPending(xdpy_))
+        return false;
+
+    XNextEvent(xdpy_, &event);
+
+    if (event.type == KeyPress) {
+        if (XLookupKeysym(&event.xkey, 0) == XK_Escape)
+            return true;
+    }
+    else if (event.type == ClientMessage) {
+        /* Window Delete event from window manager */
+        return true;
+    }
+
+    return false;
+}
+
+void
+CanvasX11::resize(int width, int height)
+{
+    resize_no_viewport(width, height);
+    glViewport(0, 0, width_, height_);
+}
+
+unsigned int
+CanvasX11::fbo()
+{
+    return fbo_;
+}
+
+bool
+CanvasX11::supports_gl2()
+{
+    std::string gl_version_str(reinterpret_cast<const char*>(glGetString(GL_VERSION)));
+    int gl_major(0);
+
+    size_t point_pos(gl_version_str.find('.'));
+
+    if (point_pos != std::string::npos) {
+        point_pos--;
+
+        size_t start_pos(gl_version_str.rfind(' ', point_pos));
+        if (start_pos == std::string::npos)
+            start_pos = 0;
+        else
+            start_pos++;
+
+        gl_major = Util::fromString<int>(
+                gl_version_str.substr(start_pos, point_pos - start_pos + 1)
+                );
+    }
+
+    return gl_major >= 2;
+}
+
+/*******************
+ * Private methods *
+ *******************/
+
+bool
+CanvasX11::ensure_x_window()
+{
+    static const char *win_name("glmark2 "GLMARK_VERSION);
+
+    if (xwin_)
+        return true;
+
+    if (!xdpy_) {
+        Log::error("Error: X11 Display has not been initialized!\n");
+        return false;
+    }
+
+    XVisualInfo *vis_info = get_xvisualinfo();
+    if (!vis_info) {
+        Log::error("Error: Could not get a valid XVisualInfo!\n");
+        return false;
+    }
+
+    Log::debug("Creating XWindow W: %d H: %d VisualID: 0x%x\n",
+               width_, height_, vis_info->visualid);
+
+    /* window attributes */
+    XSetWindowAttributes attr;
+    unsigned long mask;
+    Window root = RootWindow(xdpy_, DefaultScreen(xdpy_));
+
+    attr.background_pixel = 0;
+    attr.border_pixel = 0;
+    attr.colormap = XCreateColormap(xdpy_, root, vis_info->visual, AllocNone);
+    attr.event_mask = KeyPressMask;
+    mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
+
+    xwin_ = XCreateWindow(xdpy_, root, 0, 0, width_, height_,
+                          0, vis_info->depth, InputOutput,
+                          vis_info->visual, mask, &attr);
+
+    XFree(vis_info);
+
+    if (!xwin_) {
+        Log::error("Error: XCreateWindow() failed!\n");
+        return false;
+    }
+
+    /* set hints and properties */
+    if (fullscreen_) {
+        Atom atom = XInternAtom(xdpy_, "_NET_WM_STATE_FULLSCREEN", True);
+        XChangeProperty(xdpy_, xwin_,
+                        XInternAtom(xdpy_, "_NET_WM_STATE", True),
+                        XA_ATOM, 32, PropModeReplace,
+                        reinterpret_cast<unsigned char*>(&atom),  1);
+    }
+    else {
+        XSizeHints sizehints;
+        sizehints.min_width  = width_;
+        sizehints.min_height = height_;
+        sizehints.max_width  = width_;
+        sizehints.max_height = height_;
+        sizehints.flags = PMaxSize | PMinSize;
+
+        XSetWMProperties(xdpy_, xwin_, NULL, NULL,
+                         NULL, 0, &sizehints, NULL, NULL);
+    }
+
+    /* Set the window name */
+    XStoreName(xdpy_ , xwin_,  win_name);
+
+    /* Gracefully handle Window Delete event from window manager */
+    Atom wmDelete = XInternAtom(xdpy_, "WM_DELETE_WINDOW", True);
+    XSetWMProtocols(xdpy_, xwin_, &wmDelete, 1);
+
+    return true;
+}
+
+void
+CanvasX11::resize_no_viewport(int width, int height)
+{
+    bool request_fullscreen = (width == -1 || height == -1);
+
+    /* Recreate an existing window only if it has actually been resized */
+    if (xwin_) {
+        if (width_ != width || height_ != height ||
+            fullscreen_ != request_fullscreen)
+        {
+            XDestroyWindow(xdpy_, xwin_);
+            xwin_ = 0;
+        }
+        else
+        {
+            return;
+        }
+    }
+
+    fullscreen_ = request_fullscreen;
+
+    if (fullscreen_) {
+        /* Get the screen (root window) size */
+        XWindowAttributes window_attr;
+        XGetWindowAttributes(xdpy_, RootWindow(xdpy_, DefaultScreen(xdpy_)), 
+                             &window_attr);
+        width_ = window_attr.width;
+        height_ = window_attr.height;
+    }
+    else {
+        width_ = width;
+        height_ = height;
+    }
+
+    if (!ensure_x_window())
+        Log::error("Error: Couldn't create X Window!\n");
+
+    if (color_renderbuffer_) {
+        glBindRenderbuffer(GL_RENDERBUFFER, color_renderbuffer_);
+        glRenderbufferStorage(GL_RENDERBUFFER, gl_color_format_,
+                              width_, height_);
+    }
+
+    if (depth_renderbuffer_) {
+        glBindRenderbuffer(GL_RENDERBUFFER, depth_renderbuffer_);
+        glRenderbufferStorage(GL_RENDERBUFFER, gl_depth_format_,
+                              width_, height_);
+    }
+
+    projection_ = LibMatrix::Mat4::perspective(60.0, width_ / static_cast<float>(height_),
+                                               1.0, 1024.0);
+}
+
+bool
+CanvasX11::do_make_current()
+{
+    if (!make_current())
+        return false;
+
+    if (offscreen_) {
+        if (!ensure_fbo())
+            return false;
+
+        glBindFramebuffer(GL_FRAMEBUFFER, fbo_);
+    }
+
+    return true;
+}
+
+bool
+CanvasX11::ensure_gl_formats()
+{
+    if (gl_color_format_ && gl_depth_format_)
+        return true;
+
+    GLVisualConfig vc;
+    get_glvisualconfig(vc);
+
+    gl_color_format_ = 0;
+    gl_depth_format_ = 0;
+
+    bool supports_rgba8(false);
+    bool supports_rgb8(false);
+    bool supports_depth24(false);
+    bool supports_depth32(false);
+
+#if USE_GLESv2
+    if (GLExtensions::support("GL_ARM_rgba8"))
+        supports_rgba8 = true;
+
+    if (GLExtensions::support("GL_OES_rgb8_rgba8")) {
+        supports_rgba8 = true;
+        supports_rgb8 = true;
+    }
+
+    if (GLExtensions::support("GL_OES_depth24"))
+        supports_depth24 = true;
+
+    if (GLExtensions::support("GL_OES_depth32"))
+        supports_depth32 = true;
+#elif USE_GL
+    supports_rgba8 = true;
+    supports_rgb8 = true;
+    supports_depth24 = true;
+    supports_depth32 = true;
+#endif
+
+    if (vc.buffer == 32) {
+        if (supports_rgba8)
+            gl_color_format_ = GL_RGBA8;
+        else
+            gl_color_format_ = GL_RGBA4;
+    }
+    else if (vc.buffer == 24) {
+        if (supports_rgb8)
+            gl_color_format_ = GL_RGB8;
+        else
+            gl_color_format_ = GL_RGB565;
+    }
+    else if (vc.buffer == 16) {
+        if (vc.red == 4 && vc.green == 4 &&
+            vc.blue == 4 && vc.alpha == 4)
+        {
+            gl_color_format_ = GL_RGBA4;
+        }
+        else if (vc.red == 5 && vc.green == 5 &&
+                 vc.blue == 5 && vc.alpha == 1)
+        {
+            gl_color_format_ = GL_RGB5_A1;
+        }
+        else if (vc.red == 5 && vc.green == 6 &&
+                 vc.blue == 5 && vc.alpha == 0)
+        {
+            gl_color_format_ = GL_RGB565;
+        }
+    }
+
+    if (vc.depth == 32 && supports_depth32)
+        gl_depth_format_ = GL_DEPTH_COMPONENT32;
+    else if (vc.depth >= 24 && supports_depth24)
+        gl_depth_format_ = GL_DEPTH_COMPONENT24;
+    else if (vc.depth == 16)
+        gl_depth_format_ = GL_DEPTH_COMPONENT16;
+
+    Log::debug("Selected Renderbuffer ColorFormat: %s DepthFormat: %s\n",
+               get_gl_format_str(gl_color_format_),
+               get_gl_format_str(gl_depth_format_));
+
+    return (gl_color_format_ && gl_depth_format_);
+}
+
+bool
+CanvasX11::ensure_fbo()
+{
+    if (!fbo_) {
+        if (!ensure_gl_formats())
+            return false;
+
+        /* Create a texture for the color attachment  */
+        glGenRenderbuffers(1, &color_renderbuffer_);
+        glBindRenderbuffer(GL_RENDERBUFFER, color_renderbuffer_);
+        glRenderbufferStorage(GL_RENDERBUFFER, gl_color_format_,
+                              width_, height_);
+
+        /* Create a renderbuffer for the depth attachment */
+        glGenRenderbuffers(1, &depth_renderbuffer_);
+        glBindRenderbuffer(GL_RENDERBUFFER, depth_renderbuffer_);
+        glRenderbufferStorage(GL_RENDERBUFFER, gl_depth_format_,
+                              width_, height_);
+
+        /* Create a FBO and set it up */
+        glGenFramebuffers(1, &fbo_);
+        glBindFramebuffer(GL_FRAMEBUFFER, fbo_);
+        glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+                                  GL_RENDERBUFFER, color_renderbuffer_);
+        glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
+                                  GL_RENDERBUFFER, depth_renderbuffer_);
+    }
+
+    return true;
+}
+
+void
+CanvasX11::release_fbo()
+{
+    glDeleteFramebuffers(1, &fbo_);
+    glDeleteRenderbuffers(1, &color_renderbuffer_);
+    glDeleteRenderbuffers(1, &depth_renderbuffer_);
+    fbo_ = 0;
+    color_renderbuffer_ = 0;
+    depth_renderbuffer_ = 0;
+
+    gl_color_format_ = 0;
+    gl_depth_format_ = 0;
+}
+
+const char *
+CanvasX11::get_gl_format_str(GLenum f)
+{
+    const char *str;
+
+    switch(f) {
+        case GL_RGBA8: str = "GL_RGBA8"; break;
+        case GL_RGB8: str = "GL_RGB8"; break;
+        case GL_RGBA4: str = "GL_RGBA4"; break;
+        case GL_RGB5_A1: str = "GL_RGB5_A1"; break;
+        case GL_RGB565: str = "GL_RGB565"; break;
+        case GL_DEPTH_COMPONENT16: str = "GL_DEPTH_COMPONENT16"; break;
+        case GL_DEPTH_COMPONENT24: str = "GL_DEPTH_COMPONENT24"; break;
+        case GL_DEPTH_COMPONENT32: str = "GL_DEPTH_COMPONENT32"; break;
+        case GL_NONE: str = "GL_NONE"; break;
+        default: str = "Unknown"; break;
+    }
+
+    return str;
+}
+
diff --git a/src/canvas-x11.h b/src/canvas-x11.h
new file mode 100644
index 0000000..7b3b456
--- /dev/null
+++ b/src/canvas-x11.h
@@ -0,0 +1,141 @@
+/*
+ * Copyright © 2010-2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis (glmark2)
+ */
+#ifndef GLMARK2_CANVAS_X11_H_
+#define GLMARK2_CANVAS_X11_H_
+
+#include "canvas.h"
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+
+/**
+ * Canvas for rendering with GL to an X11 window.
+ */
+class CanvasX11 : public Canvas
+{
+public:
+    ~CanvasX11() {}
+
+    virtual bool init();
+    virtual bool reset();
+    virtual void visible(bool visible);
+    virtual void clear();
+    virtual void update();
+    virtual void print_info();
+    virtual Pixel read_pixel(int x, int y);
+    virtual void write_to_file(std::string &filename);
+    virtual bool should_quit();
+    virtual void resize(int width, int height);
+    virtual unsigned int fbo();
+
+protected:
+    CanvasX11(int width, int height) :
+        Canvas(width, height), xwin_(0), xdpy_(0), fullscreen_(false),
+        gl_color_format_(0), gl_depth_format_(0),
+        color_renderbuffer_(0), depth_renderbuffer_(0), fbo_(0) {}
+
+    /**
+     * Gets the XVisualInfo to use for creating the X window with.
+     *
+     * The caller should XFree() the returned XVisualInfo when done.
+     *
+     * This method should be implemented in derived classes.
+     *
+     * @return the XVisualInfo
+     */
+    virtual XVisualInfo *get_xvisualinfo() = 0;
+
+    /**
+     * Initializes window system interfaces for GL rendering.
+     *
+     * This method should be implemented in derived classes.
+     *
+     * @return whether the operation succeeded
+     */
+    virtual bool init_gl_winsys() = 0;
+
+    /**
+     * Makes the canvas the current target for GL rendering.
+     *
+     * This method should be implemented in derived classes.
+     *
+     * @return whether the operation succeeded
+     */
+    virtual bool make_current() = 0;
+
+    /**
+     * Resets the underlying GL context for rendering.
+     *
+     * This method should be implemented in derived classes.
+     *
+     * @return whether the operation succeeded
+     */
+    virtual bool reset_context() = 0;
+
+    /**
+     * Swaps the GL buffers (assuming double buffering is used).
+     *
+     * This method should be implemented in derived classes.
+     *
+     * @return whether the operation succeeded
+     */
+    virtual void swap_buffers() = 0;
+
+    /**
+     * Gets information about the GL visual used for this canvas.
+     *
+     * This method should be implemented in derived classes.
+     */
+    virtual void get_glvisualconfig(GLVisualConfig &visual_config) = 0;
+
+    /**
+     * Whether the current implementation supports GL(ES) 2.0.
+     *
+     * @return true if it supports GL(ES) 2.0, false otherwise
+     */
+    bool supports_gl2();
+
+
+    /** The X window associated with this canvas. */
+    Window xwin_;
+    /** The X display associated with this canvas. */
+    Display *xdpy_;
+
+private:
+    void resize_no_viewport(int width, int height);
+    bool ensure_x_window();
+    bool do_make_current();
+    bool ensure_gl_formats();
+    bool ensure_fbo();
+    void release_fbo();
+
+    const char *get_gl_format_str(GLenum f);
+
+    bool fullscreen_;
+    GLenum gl_color_format_;
+    GLenum gl_depth_format_;
+    GLuint color_renderbuffer_;
+    GLuint depth_renderbuffer_;
+    GLuint fbo_;
+};
+
+#endif
+
diff --git a/src/canvas.h b/src/canvas.h
new file mode 100644
index 0000000..4983ada
--- /dev/null
+++ b/src/canvas.h
@@ -0,0 +1,261 @@
+/*
+ * Copyright © 2008 Ben Smith
+ * Copyright © 2010-2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Ben Smith (original glmark benchmark)
+ *  Alexandros Frantzis (glmark2)
+ *  Jesse Barker
+ */
+#ifndef GLMARK2_CANVAS_H_
+#define GLMARK2_CANVAS_H_
+
+#include "gl-headers.h"
+#include "mat.h"
+#include "gl-visual-config.h"
+
+#include <stdint.h>
+#include <string>
+#include <stdio.h>
+#include <cmath>
+
+/**
+ * Abstraction for a GL rendering target.
+ */
+class Canvas
+{
+public:
+    virtual ~Canvas() {}
+
+    /**
+     * A pixel value.
+     */
+    struct Pixel {
+        Pixel():
+            r(0), g(0), b(0), a(0) {}
+        Pixel(uint8_t r, uint8_t g, uint8_t b, uint8_t a):
+            r(r), g(g), b(b), a(a) {}
+        /**
+         * Gets the pixel value as a 32-bit integer in 0xAABBGGRR format.
+         *
+         * @return the pixel value
+         */
+        uint32_t to_le32()
+        {
+            return static_cast<uint32_t>(r) +
+                   (static_cast<uint32_t>(g) << 8) +
+                   (static_cast<uint32_t>(b) << 16) +
+                   (static_cast<uint32_t>(a) << 24);
+
+        }
+
+        /**
+         * Gets the euclidian distance from this pixel in 3D RGB space.
+         *
+         * @param p the pixel to get the distance from
+         *
+         * @return the euclidian distance
+         */
+        double distance_rgb(const Canvas::Pixel &p)
+        {
+            // These work without casts because of integer promotion rules
+            // (the uint8_ts are promoted to ints)
+            double d = (r - p.r) * (r - p.r) +
+                       (g - p.g) * (g - p.g) +
+                       (b - p.b) * (b - p.b);
+            return std::sqrt(d);
+        }
+
+        uint8_t r;
+        uint8_t g;
+        uint8_t b;
+        uint8_t a;
+    };
+
+
+    /**
+     * Initializes the canvas and makes it the target of GL operations.
+     *
+     * This method should be implemented in derived classes.
+     *
+     * @return whether initialization succeeded
+     */
+    virtual bool init() { return false; }
+
+    /**
+     * Resets the canvas, destroying and recreating resources to give each new
+     * test scenario a fresh context for rendering.
+     *
+     * This method should be implemented in derived classes.
+     *
+     * @return whether reset succeeded
+     */
+    virtual bool reset() { return false; }
+
+    /**
+     * Changes the visibility of the canvas.
+     *
+     * The canvas is initially not visible.
+     *
+     * This method should be implemented in derived classes.
+     *
+     * @param visible true to make the Canvas visible, false otherwise
+     */
+    virtual void visible(bool visible) { static_cast<void>(visible); }
+
+    /**
+     * Clears the canvas.
+     * This method should be implemented in derived classes.
+     */
+    virtual void clear() {}
+
+    /**
+     * Ensures that the canvas on-screen representation gets updated
+     * with the latest canvas contents.
+     *
+     * This method should be implemented in derived classes.
+     */
+    virtual void update() {}
+
+    /**
+     * Prints information about the canvas.
+     *
+     * This method should be implemented in derived classes.
+     */
+    virtual void print_info() {}
+
+    /**
+     * Reads a pixel from the canvas.
+     *
+     * The (0, 0) point is the lower left corner. The X and Y coordinates
+     * increase towards the right and top, respectively.
+     *
+     * This method should be implemented in derived classes.
+     *
+     * @param x the X coordinate
+     * @param y the Y coordinate
+     *
+     * @return the pixel
+     */
+    virtual Pixel read_pixel(int x, int y)
+    {
+        static_cast<void>(x);
+        static_cast<void>(y);
+        return Pixel();
+    }
+
+    /**
+     * Writes the canvas contents to a file.
+     *
+     * The pixel save order is  upper left to lower right. Each pixel value
+     * is stored as four consecutive bytes R,G,B,A.
+     *
+     * This method should be implemented in derived classes.
+     *
+     * @param filename the name of the file to write to
+     */
+    virtual void write_to_file(std::string &filename) { static_cast<void>(filename); }
+
+    /**
+     * Whether we should quit the application.
+     *
+     * This method should be implemented in derived classes.
+     *
+     * @return true if we should quit, false otherwise
+     */
+    virtual bool should_quit() { return false; }
+
+    /**
+     * Resizes the canvas.
+     *
+     * This method should be implemented in derived classes.
+     *
+     * @param width the new width in pixels
+     * @param height the new height in pixels
+     *
+     * @return true if we should quit, false otherwise
+     */
+    virtual void resize(int width, int height) { static_cast<void>(width); static_cast<void>(height); }
+
+    /**
+     * Gets the FBO associated with the canvas.
+     *
+     * @return the FBO
+     */
+    virtual unsigned int fbo() { return 0; }
+
+    /**
+     * Gets a dummy canvas object.
+     *
+     * @return the dummy canvas
+     */
+    static Canvas &dummy()
+    {
+        static Canvas dummy_canvas(0, 0);
+        return dummy_canvas;
+    }
+
+    /**
+     * Gets the width of the canvas.
+     *
+     * @return the width in pixels
+     */
+    int width() { return width_; }
+
+    /**
+     * Gets the height of the canvas.
+     *
+     * @return the height in pixels
+     */
+    int height() { return height_; }
+
+    /**
+     * Gets the projection matrix recommended for use with the canvas.
+     *
+     * It's not mandatory to use this projection matrix.
+     *
+     * @return the projection matrix
+     */
+    const LibMatrix::mat4 &projection() { return projection_; }
+
+    /**
+     * Sets whether the canvas should be backed by an off-screen surface.
+     *
+     * This takes effect after the next init()/reset().
+     */
+    void offscreen(bool offscreen) { offscreen_ = offscreen; }
+
+    /**
+     * Sets the preferred visual configuration.
+     *
+     * This takes effect after the next init()/reset().
+     */
+    void visual_config(GLVisualConfig &config) { visual_config_ = config; }
+
+protected:
+    Canvas(int width, int height) :
+        width_(width), height_(height), offscreen_(false) {}
+
+    int width_;
+    int height_;
+    LibMatrix::mat4 projection_;
+    bool offscreen_;
+    GLVisualConfig visual_config_;
+};
+
+#endif
diff --git a/src/default-benchmarks.h b/src/default-benchmarks.h
new file mode 100644
index 0000000..3726a61
--- /dev/null
+++ b/src/default-benchmarks.h
@@ -0,0 +1,79 @@
+/*
+ * Copyright © 2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis (glmark2)
+ */
+#ifndef GLMARK2_DEFAULT_BENCHMARKS_H_
+#define GLMARK2_DEFAULT_BENCHMARKS_H_
+
+#include <string>
+#include <vector>
+
+class DefaultBenchmarks
+{
+public:
+    static const std::vector<std::string>& get()
+    {
+        static std::vector<std::string> default_benchmarks;
+
+        if (default_benchmarks.empty())
+            populate(default_benchmarks);
+
+        return default_benchmarks;
+    }
+
+private:
+    static void populate(std::vector<std::string>& benchmarks)
+    {
+        benchmarks.push_back("build:use-vbo=false");
+        benchmarks.push_back("build:use-vbo=true");
+        benchmarks.push_back("texture:texture-filter=nearest");
+        benchmarks.push_back("texture:texture-filter=linear");
+        benchmarks.push_back("texture:texture-filter=mipmap");
+        benchmarks.push_back("shading:shading=gouraud");
+        benchmarks.push_back("shading:shading=blinn-phong-inf");
+        benchmarks.push_back("shading:shading=phong");
+        benchmarks.push_back("bump:bump-render=high-poly");
+        benchmarks.push_back("bump:bump-render=normals");
+        benchmarks.push_back("bump:bump-render=height");
+        benchmarks.push_back("effect2d:kernel=0,1,0;1,-4,1;0,1,0;");
+        benchmarks.push_back("effect2d:kernel=1,1,1,1,1;1,1,1,1,1;1,1,1,1,1;");
+        benchmarks.push_back("pulsar:quads=5:texture=false:light=false");
+        benchmarks.push_back("desktop:windows=4:effect=blur:blur-radius=5:passes=1:separable=true");
+        benchmarks.push_back("desktop:windows=4:effect=shadow");
+        benchmarks.push_back("buffer:update-fraction=0.5:update-dispersion=0.9:columns=200:update-method=map:interleave=false");
+        benchmarks.push_back("buffer:update-fraction=0.5:update-dispersion=0.9:columns=200:update-method=subdata:interleave=false");
+        benchmarks.push_back("buffer:update-fraction=0.5:update-dispersion=0.9:columns=200:update-method=map:interleave=true");
+        benchmarks.push_back("ideas:speed=duration");
+        benchmarks.push_back("jellyfish");
+        benchmarks.push_back("terrain");
+        benchmarks.push_back("shadow");
+        benchmarks.push_back("refract");
+        benchmarks.push_back("conditionals:vertex-steps=0:fragment-steps=0");
+        benchmarks.push_back("conditionals:vertex-steps=0:fragment-steps=5");
+        benchmarks.push_back("conditionals:vertex-steps=5:fragment-steps=0");
+        benchmarks.push_back("function:fragment-steps=5:fragment-complexity=low");
+        benchmarks.push_back("function:fragment-steps=5:fragment-complexity=medium");
+        benchmarks.push_back("loop:vertex-steps=5:fragment-steps=5:fragment-loop=false");
+        benchmarks.push_back("loop:vertex-steps=5:fragment-steps=5:fragment-uniform=false");
+        benchmarks.push_back("loop:vertex-steps=5:fragment-steps=5:fragment-uniform=true");
+    }
+};
+
+#endif
diff --git a/src/egl-state.cpp b/src/egl-state.cpp
new file mode 100644
index 0000000..639421a
--- /dev/null
+++ b/src/egl-state.cpp
@@ -0,0 +1,578 @@
+//
+// Copyright © 2012 Linaro Limited
+//
+// This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+//
+// glmark2 is free software: you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the Free Software
+// Foundation, either version 3 of the License, or (at your option) any later
+// version.
+//
+// glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+// details.
+//
+// You should have received a copy of the GNU General Public License along with
+// glmark2.  If not, see <http://www.gnu.org/licenses/>.
+//
+// Authors:
+//  Jesse Barker
+//
+#include "egl-state.h"
+#include "log.h"
+#include "options.h"
+#include "limits.h"
+#include <iomanip>
+#include <sstream>
+
+using std::vector;
+using std::string;
+
+EglConfig::EglConfig(EGLDisplay dpy, EGLConfig config) :
+    handle_(config),
+    bufferSize_(0),
+    redSize_(0),
+    greenSize_(0),
+    blueSize_(0),
+    luminanceSize_(0),
+    alphaSize_(0),
+    alphaMaskSize_(0),
+    bindTexRGB_(false),
+    bindTexRGBA_(false),
+    bufferType_(EGL_RGB_BUFFER),
+    caveat_(0),
+    configID_(0),
+    conformant_(0),
+    depthSize_(0),
+    level_(0),
+    pbufferWidth_(0),
+    pbufferHeight_(0),
+    pbufferPixels_(0),
+    minSwapInterval_(0),
+    maxSwapInterval_(0),
+    nativeID_(0),
+    nativeType_(0),
+    nativeRenderable_(false),
+    sampleBuffers_(0),
+    samples_(0),
+    stencilSize_(0),
+    surfaceType_(0),
+    xparentType_(0),
+    xparentRedValue_(0),
+    xparentGreenValue_(0),
+    xparentBlueValue_(0)
+{
+    vector<string> badAttribVec;
+    if (!eglGetConfigAttrib(dpy, handle_, EGL_CONFIG_ID, &configID_))
+    {
+        badAttribVec.push_back("EGL_CONFIG_ID");
+    }
+    if (!eglGetConfigAttrib(dpy, handle_, EGL_CONFIG_CAVEAT, &caveat_))
+    {
+        badAttribVec.push_back("EGL_CONFIG_CAVEAT");
+    }
+    if (!eglGetConfigAttrib(dpy, handle_, EGL_CONFORMANT, &conformant_))
+    {
+        badAttribVec.push_back("EGL_CONFORMANT");
+    }
+    if (!eglGetConfigAttrib(dpy, handle_, EGL_COLOR_BUFFER_TYPE, &bufferType_))
+    {
+        badAttribVec.push_back("EGL_COLOR_BUFFER_TYPE");
+    }
+    if (!eglGetConfigAttrib(dpy, handle_, EGL_BUFFER_SIZE, &bufferSize_))
+    {
+        badAttribVec.push_back("EGL_BUFFER_SIZE");
+    }
+
+    if (bufferType_ == EGL_RGB_BUFFER)
+    {
+        if (!eglGetConfigAttrib(dpy, handle_, EGL_RED_SIZE, &redSize_))
+        {
+            badAttribVec.push_back("EGL_RED_SIZE");
+        }
+        if (!eglGetConfigAttrib(dpy, handle_, EGL_GREEN_SIZE, &greenSize_))
+        {
+            badAttribVec.push_back("EGL_GREEN_SIZE");
+        }
+        if (!eglGetConfigAttrib(dpy, handle_, EGL_BLUE_SIZE, &blueSize_))
+        {
+            badAttribVec.push_back("EGL_BLUE_SIZE");
+        }
+    }
+    else
+    {
+        if (!eglGetConfigAttrib(dpy, handle_, EGL_LUMINANCE_SIZE, &luminanceSize_))
+        {
+            badAttribVec.push_back("EGL_LUMINANCE_SIZE");
+        }
+    }
+    if (!eglGetConfigAttrib(dpy, handle_, EGL_ALPHA_SIZE, &alphaSize_))
+    {
+        badAttribVec.push_back("EGL_ALPHA_SIZE");
+    }
+    if (!eglGetConfigAttrib(dpy, handle_, EGL_ALPHA_MASK_SIZE, &alphaMaskSize_))
+    {
+        badAttribVec.push_back("EGL_ALPHA_MASK_SIZE");
+    }
+    if (!eglGetConfigAttrib(dpy, handle_, EGL_DEPTH_SIZE, &depthSize_))
+    {
+        badAttribVec.push_back("EGL_DEPTH_SIZE");
+    }
+    if (!eglGetConfigAttrib(dpy, handle_, EGL_STENCIL_SIZE, &stencilSize_))
+    {
+        badAttribVec.push_back("EGL_STENCIL_SIZE");
+    }
+    EGLint doBind(EGL_FALSE);
+    if (!eglGetConfigAttrib(dpy, handle_, EGL_BIND_TO_TEXTURE_RGB, &doBind))
+    {
+        badAttribVec.push_back("EGL_BIND_TO_TEXTURE_RGB");
+    }
+    bindTexRGB_ = (doBind == EGL_TRUE);
+    if (!eglGetConfigAttrib(dpy, handle_, EGL_BIND_TO_TEXTURE_RGBA, &doBind))
+    {
+        badAttribVec.push_back("EGL_BIND_TO_TEXTURE_RGBA");
+    }
+    bindTexRGBA_ = (doBind == EGL_TRUE);
+    if (!eglGetConfigAttrib(dpy, handle_, EGL_LEVEL, &level_))
+    {
+        badAttribVec.push_back("EGL_LEVEL");
+    }
+    if (!eglGetConfigAttrib(dpy, handle_, EGL_MAX_PBUFFER_WIDTH, &pbufferWidth_))
+    {
+        badAttribVec.push_back("EGL_MAX_PBUFFER_WIDTH");
+    }
+    if (!eglGetConfigAttrib(dpy, handle_, EGL_MAX_PBUFFER_HEIGHT, &pbufferHeight_))
+    {
+        badAttribVec.push_back("EGL_MAX_PBUFFER_HEIGHT");
+    }
+    if (!eglGetConfigAttrib(dpy, handle_, EGL_MAX_PBUFFER_PIXELS, &pbufferPixels_))
+    {
+        badAttribVec.push_back("EGL_MAX_PBUFFER_PIXELS");
+    }
+    if (!eglGetConfigAttrib(dpy, handle_, EGL_MIN_SWAP_INTERVAL, &minSwapInterval_))
+    {
+        badAttribVec.push_back("EGL_MIN_SWAP_INTERVAL");
+    }
+    if (!eglGetConfigAttrib(dpy, handle_, EGL_MAX_SWAP_INTERVAL, &maxSwapInterval_))
+    {
+        badAttribVec.push_back("EGL_MAX_SWAP_INTERVAL");
+    }
+    EGLint doNative(EGL_FALSE);
+    if (!eglGetConfigAttrib(dpy, handle_, EGL_NATIVE_RENDERABLE, &doNative))
+    {
+        badAttribVec.push_back("EGL_NATIVE_RENDERABLE");
+    }
+    nativeRenderable_ = (doNative == EGL_TRUE);
+    if (!eglGetConfigAttrib(dpy, handle_, EGL_NATIVE_VISUAL_TYPE, &nativeType_))
+    {
+        badAttribVec.push_back("EGL_NATIVE_VISUAL_TYPE");
+    }
+    if (!eglGetConfigAttrib(dpy, handle_, EGL_NATIVE_VISUAL_ID, &nativeID_))
+    {
+        badAttribVec.push_back("EGL_NATIVE_VISUAL_ID");
+    }
+    if (!eglGetConfigAttrib(dpy, handle_, EGL_SURFACE_TYPE, &surfaceType_))
+    {
+        badAttribVec.push_back("EGL_SURFACE_TYPE");
+    }
+    if (!eglGetConfigAttrib(dpy, handle_, EGL_SAMPLE_BUFFERS, &sampleBuffers_))
+    {
+        badAttribVec.push_back("EGL_SAMPLE_BUFFERS");
+    }
+    if (sampleBuffers_)
+    {
+        if (!eglGetConfigAttrib(dpy, handle_, EGL_SAMPLES, &samples_))
+        {
+            badAttribVec.push_back("EGL_SAMPLES");
+        }        
+    }    
+    if (!eglGetConfigAttrib(dpy, handle_, EGL_TRANSPARENT_TYPE, &xparentType_))
+    {
+        badAttribVec.push_back("EGL_TRANSPARENT_TYPE");
+    }
+    //if (xparentType_ != EGL_NONE)
+    {
+        if (!eglGetConfigAttrib(dpy, handle_, EGL_TRANSPARENT_RED_VALUE, &xparentRedValue_))
+        {
+            badAttribVec.push_back("EGL_TRANSPARENT_RED_VALUE");
+        }
+        if (!eglGetConfigAttrib(dpy, handle_, EGL_TRANSPARENT_GREEN_VALUE, &xparentGreenValue_))
+        {
+            badAttribVec.push_back("EGL_TRANSPARENT_GREEN_VALUE");
+        }
+        if (!eglGetConfigAttrib(dpy, handle_, EGL_TRANSPARENT_BLUE_VALUE, &xparentBlueValue_))
+        {
+            badAttribVec.push_back("EGL_TRANSPARENT_BLUE_VALUE");
+        }
+    }
+
+    if (!badAttribVec.empty())
+    {
+        Log::error("Failed to get the following config attributes for config 0x%x:\n",
+                    config);
+        for (vector<string>::const_iterator attribIt = badAttribVec.begin();
+             attribIt != badAttribVec.end();
+             attribIt++)
+        {
+            Log::error("%s\n", attribIt->c_str());
+        }
+    }
+}
+
+void
+EglConfig::print_header()
+{
+    Log::debug("\n");
+    Log::debug("    cfg buf  rgb  colorbuffer dp st config native support surface sample\n");
+    Log::debug("     id  sz  lum  r  g  b  a  th cl caveat render  visid    type  buf ns\n");
+    Log::debug("------------------------------------------------------------------------\n");
+}
+
+void
+EglConfig::print() const
+{
+    std::ostringstream s;
+    s.setf(std::ios::showbase);
+    s.fill(' ');
+    s << std::setw(7) << std::hex << configID_;
+    s << std::setw(4) << std::dec << bufferSize_;
+    if (bufferType_ == EGL_RGB_BUFFER)
+    {
+        s << std::setw(5) << "rgb";
+        s << std::setw(3) << redSize_;
+        s << std::setw(3) << greenSize_;
+        s << std::setw(3) << blueSize_;
+    }
+    else
+    {
+        s << std::setw(5) << "lum";
+        s << std::setw(3) << luminanceSize_;
+        s << std::setw(3) << 0;
+        s << std::setw(3) << 0;
+    }
+    s << std::setw(3) << alphaSize_;
+    s << std::setw(4) << depthSize_;
+    s << std::setw(3) << stencilSize_;
+    string caveat("None");
+    switch (caveat_)
+    {
+        case EGL_SLOW_CONFIG:
+            caveat = string("Slow");
+            break;
+        case EGL_NON_CONFORMANT_CONFIG:
+            caveat = string("Ncon");
+            break;
+        case EGL_NONE:
+            // Initialized to none.
+            break;
+    }
+    s << std::setw(7) << caveat;
+    string doNative(nativeRenderable_ ? "true" : "false");
+    s << std::setw(7) << doNative;
+    s << std::setw(8) << std::hex << nativeID_;
+    s << std::setw(8) << std::hex << surfaceType_;
+    s << std::setw(4) << std::dec << sampleBuffers_;
+    s << std::setw(3) << std::dec << samples_;
+    Log::debug("%s\n", s.str().c_str());
+}
+
+
+bool
+EGLState::init_display(EGLNativeDisplayType native_display, GLVisualConfig& visual_config)
+{
+    native_display_ = native_display;
+    visual_config_ = visual_config;
+
+    return gotValidDisplay();
+}
+
+bool
+EGLState::init_surface(EGLNativeWindowType native_window)
+{
+    native_window_ = reinterpret_cast<EGLNativeWindowType>(native_window);
+
+    return gotValidSurface();
+}
+
+void
+EGLState::swap()
+{
+    eglSwapBuffers(egl_display_, egl_surface_);
+}
+
+bool
+EGLState::gotValidDisplay()
+{
+    if (egl_display_)
+        return true;
+
+    egl_display_ = eglGetDisplay(native_display_);
+    if (!egl_display_) {
+        Log::error("eglGetDisplay() failed with error: 0x%x\n", eglGetError());
+        return false;
+    }
+    int egl_major(-1);
+    int egl_minor(-1);
+    if (!eglInitialize(egl_display_, &egl_major, &egl_minor)) {
+        Log::error("eglInitialize() failed with error: 0x%x\n", eglGetError());
+        egl_display_ = 0;
+        return false;
+    }
+
+#if USE_GLESv2
+    EGLenum apiType(EGL_OPENGL_ES_API);
+#elif USE_GL
+    EGLenum apiType(EGL_OPENGL_API);
+#endif
+    if (!eglBindAPI(apiType)) {
+        Log::error("Failed to bind api EGL_OPENGL_ES_API\n");
+        return false;
+    }
+
+    return true;
+}
+
+void
+EGLState::get_glvisualconfig(EGLConfig config, GLVisualConfig& visual_config)
+{
+    eglGetConfigAttrib(egl_display_, config, EGL_BUFFER_SIZE, &visual_config.buffer);
+    eglGetConfigAttrib(egl_display_, config, EGL_RED_SIZE, &visual_config.red);
+    eglGetConfigAttrib(egl_display_, config, EGL_GREEN_SIZE, &visual_config.green);
+    eglGetConfigAttrib(egl_display_, config, EGL_BLUE_SIZE, &visual_config.blue);
+    eglGetConfigAttrib(egl_display_, config, EGL_ALPHA_SIZE, &visual_config.alpha);
+    eglGetConfigAttrib(egl_display_, config, EGL_DEPTH_SIZE, &visual_config.depth);
+    eglGetConfigAttrib(egl_display_, config, EGL_STENCIL_SIZE, &visual_config.stencil);
+}
+
+EGLConfig
+EGLState::select_best_config(std::vector<EGLConfig>& configs)
+{
+    int best_score(INT_MIN);
+    EGLConfig best_config(0);
+
+    /*
+     * Go through all the configs and choose the one with the best score,
+     * i.e., the one better matching the requested config.
+     */
+    for (std::vector<EGLConfig>::const_iterator iter = configs.begin();
+         iter != configs.end();
+         iter++)
+    {
+        const EGLConfig config(*iter);
+        GLVisualConfig vc;
+        int score;
+
+        get_glvisualconfig(config, vc);
+
+        score = vc.match_score(visual_config_);
+
+        if (score > best_score) {
+            best_score = score;
+            best_config = config;
+        }
+    }
+
+    return best_config;
+}
+
+bool
+EGLState::gotValidConfig()
+{
+    if (egl_config_)
+        return true;
+
+    if (!gotValidDisplay())
+        return false;
+
+    const EGLint config_attribs[] = {
+        EGL_RED_SIZE, visual_config_.red,
+        EGL_GREEN_SIZE, visual_config_.green,
+        EGL_BLUE_SIZE, visual_config_.blue,
+        EGL_ALPHA_SIZE, visual_config_.alpha,
+        EGL_DEPTH_SIZE, visual_config_.depth,
+        EGL_STENCIL_SIZE, visual_config_.stencil,
+#if USE_GLESv2
+        EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
+#elif USE_GL
+        EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
+#endif
+        EGL_NONE
+    };
+
+    // Find out how many configs match the attributes.
+    EGLint num_configs(0);
+    if (!eglChooseConfig(egl_display_, config_attribs, 0, 0, &num_configs)) {
+        Log::error("eglChooseConfig() (count query) failed with error: %d\n",
+                   eglGetError());
+        return false;
+    }
+
+    if (num_configs == 0) {
+        Log::error("eglChooseConfig() didn't return any configs\n");
+        return false;
+    }
+
+    // Get all the matching configs
+    vector<EGLConfig> configs(num_configs);
+    if (!eglChooseConfig(egl_display_, config_attribs, &configs.front(),
+                         num_configs, &num_configs))
+    {
+        Log::error("eglChooseConfig() failed with error: %d\n",
+                     eglGetError());
+        return false;
+    }
+
+    // Select the best matching config
+    egl_config_ = select_best_config(configs);
+
+    vector<EglConfig> configVec;
+    for (vector<EGLConfig>::const_iterator configIt = configs.begin();
+         configIt != configs.end();
+         configIt++)
+    {
+        EglConfig cfg(egl_display_, *configIt);
+        configVec.push_back(cfg);
+        if (*configIt == egl_config_) {
+            best_config_ = cfg;
+        }
+    } 
+
+    // Print out the config information, and let the user know the decision
+    // about the "best" one with respect to the options.
+    unsigned int lineNumber(0);
+    Log::debug("Got %u suitable EGLConfigs:\n", num_configs);
+    for (vector<EglConfig>::const_iterator configIt = configVec.begin();
+         configIt != configVec.end();
+         configIt++, lineNumber++)
+    {
+        if (!(lineNumber % 32))
+        {
+            configIt->print_header();
+        }
+        configIt->print();
+    }
+    Log::debug("\n");
+    Log::debug("Best EGLConfig ID: 0x%x\n", best_config_.configID());
+
+    return true;
+}
+
+bool
+EGLState::gotValidSurface()
+{
+    if (egl_surface_)
+        return true;
+
+    if (!gotValidDisplay())
+        return false;
+
+    if (!gotValidConfig())
+        return false;
+
+    egl_surface_ = eglCreateWindowSurface(egl_display_, egl_config_, native_window_, 0);
+    if (!egl_surface_) {
+        Log::error("eglCreateWindowSurface failed with error: 0x%x\n", eglGetError());
+        return false;
+    }
+
+    return true;
+}
+
+bool
+EGLState::gotValidContext()
+{
+    if (egl_context_)
+        return true;
+
+    if (!gotValidDisplay())
+        return false;
+
+    if (!gotValidConfig())
+        return false;
+
+    static const EGLint context_attribs[] = {
+#ifdef USE_GLESv2
+        EGL_CONTEXT_CLIENT_VERSION, 2,
+#endif
+        EGL_NONE
+    };
+
+    egl_context_ = eglCreateContext(egl_display_, egl_config_,
+                                    EGL_NO_CONTEXT, context_attribs);
+    if (!egl_context_) {
+        Log::error("eglCreateContext() failed with error: 0x%x\n",
+                   eglGetError());
+        return false;
+    }
+
+    return true;
+}
+
+bool
+EGLState::valid()
+{
+    if (!gotValidDisplay())
+        return false;
+
+    if (!gotValidConfig())
+        return false;
+
+    if (!gotValidSurface())
+        return false;
+
+    if (!gotValidContext())
+        return false;
+
+    if (egl_context_ == eglGetCurrentContext())
+        return true;
+
+    if (!eglMakeCurrent(egl_display_, egl_surface_, egl_surface_, egl_context_)) {
+        Log::error("eglMakeCurrent failed with error: 0x%x\n", eglGetError());
+        return false;
+    }
+
+    if (!eglSwapInterval(egl_display_, 0)) {
+        Log::info("** Failed to set swap interval. Results may be bounded above by refresh rate.\n");
+    }
+
+    return true;
+}
+
+bool
+EGLState::gotNativeConfig(int& vid)
+{
+    if (!gotValidConfig())
+        return false;
+
+    EGLint native_id;
+    if (!eglGetConfigAttrib(egl_display_, egl_config_, EGL_NATIVE_VISUAL_ID,
+        &native_id))
+    {
+        Log::debug("Failed to get native visual id for EGLConfig 0x%x\n", egl_config_);
+        return false;
+    }
+
+    vid = native_id;
+    return true;
+}
+
+bool
+EGLState::reset()
+{
+    if (!gotValidDisplay()) {
+        return false;
+    }
+
+    if (!egl_context_) {
+        return true;
+    }
+
+    if (EGL_FALSE == eglDestroyContext(egl_display_, egl_context_)) {
+        Log::debug("eglDestroyContext failed with error: 0x%x\n", eglGetError());
+    }
+
+    egl_context_ = 0;
+
+    return true;
+}
diff --git a/src/egl-state.h b/src/egl-state.h
new file mode 100644
index 0000000..2eaeba3
--- /dev/null
+++ b/src/egl-state.h
@@ -0,0 +1,151 @@
+//
+// Copyright © 2012 Linaro Limited
+//
+// This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+//
+// glmark2 is free software: you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the Free Software
+// Foundation, either version 3 of the License, or (at your option) any later
+// version.
+//
+// glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+// details.
+//
+// You should have received a copy of the GNU General Public License along with
+// glmark2.  If not, see <http://www.gnu.org/licenses/>.
+//
+// Authors:
+//  Jesse Barker
+//
+#ifndef EGL_STATE_H_
+#define EGL_STATE_H_
+
+#include <vector>
+#include <EGL/egl.h>
+#include "gl-visual-config.h"
+
+class EglConfig
+{
+    EGLConfig handle_;
+    // Color buffer attributes.
+    EGLint bufferSize_;
+    EGLint redSize_;
+    EGLint greenSize_;
+    EGLint blueSize_;
+    EGLint luminanceSize_;
+    EGLint alphaSize_;
+    EGLint alphaMaskSize_;
+    bool bindTexRGB_;
+    bool bindTexRGBA_;
+    EGLint bufferType_;
+    // Base config attributes
+    EGLint caveat_;
+    EGLint configID_;
+    EGLint conformant_;
+    // Depth buffer
+    EGLint depthSize_;
+    // Framebuffer level
+    EGLint level_;
+    // Pbuffers
+    EGLint pbufferWidth_;
+    EGLint pbufferHeight_;
+    EGLint pbufferPixels_;
+    // Swap interval
+    EGLint minSwapInterval_;
+    EGLint maxSwapInterval_;
+    // Native window system attributes.
+    EGLint nativeID_;
+    EGLint nativeType_;
+    bool nativeRenderable_;
+    // Multisample support
+    EGLint sampleBuffers_;
+    EGLint samples_;
+    // Stencil buffer
+    EGLint stencilSize_;
+    EGLint surfaceType_;
+    // Transparency
+    EGLint xparentType_; // Should be RGB or NONE
+    EGLint xparentRedValue_;
+    EGLint xparentGreenValue_;
+    EGLint xparentBlueValue_;
+
+public:
+    EglConfig() :
+        handle_(0),
+        bufferSize_(0),
+        redSize_(0),
+        greenSize_(0),
+        blueSize_(0),
+        luminanceSize_(0),
+        alphaSize_(0),
+        alphaMaskSize_(0),
+        bindTexRGB_(false),
+        bindTexRGBA_(false),
+        bufferType_(EGL_RGB_BUFFER),
+        caveat_(0),
+        configID_(0),
+        conformant_(0),
+        depthSize_(0),
+        level_(0),
+        pbufferWidth_(0),
+        pbufferHeight_(0),
+        pbufferPixels_(0),
+        minSwapInterval_(0),
+        maxSwapInterval_(0),
+        nativeID_(0),
+        nativeType_(0),
+        nativeRenderable_(false),
+        sampleBuffers_(0),
+        samples_(0),
+        stencilSize_(0),
+        surfaceType_(0),
+        xparentType_(0),
+        xparentRedValue_(0),
+        xparentGreenValue_(0),
+        xparentBlueValue_(0) {}
+    EglConfig(EGLDisplay dpy, EGLConfig config);
+    ~EglConfig() {}
+    void print() const;
+    static void print_header();
+    bool isWindowConfig() const { return surfaceType_ & EGL_WINDOW_BIT; }
+    EGLint configID() const { return configID_; }
+};
+
+class EGLState
+{
+    EGLNativeDisplayType native_display_;
+    EGLNativeWindowType native_window_;
+    EGLDisplay egl_display_;
+    EGLConfig egl_config_;
+    EGLContext egl_context_;
+    EGLSurface egl_surface_;
+    GLVisualConfig visual_config_;
+    EglConfig best_config_;
+    bool gotValidDisplay();
+    bool gotValidConfig();
+    bool gotValidSurface();
+    bool gotValidContext();
+    void get_glvisualconfig(EGLConfig config, GLVisualConfig& visual_config);
+    EGLConfig select_best_config(std::vector<EGLConfig>& configs);
+public:
+    EGLState() :
+        native_display_(0),
+        native_window_(0),
+        egl_display_(0),
+        egl_config_(0),
+        egl_context_(0),
+        egl_surface_(0) {}
+    ~EGLState() {}
+    bool valid();
+    bool init_display(EGLNativeDisplayType native_display, GLVisualConfig& config_pref);
+    bool init_surface(EGLNativeWindowType native_window);
+    bool reset();
+    void swap();
+    // Performs a config search, returning a native visual ID on success
+    bool gotNativeConfig(int& vid);
+    void getVisualConfig(GLVisualConfig& vc) { vc = visual_config_; }
+};
+
+#endif // EGL_STATE_H_
diff --git a/src/gl-headers.cpp b/src/gl-headers.cpp
new file mode 100644
index 0000000..487c3c1
--- /dev/null
+++ b/src/gl-headers.cpp
@@ -0,0 +1,46 @@
+/*
+ * Copyright © 2010-2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis (glmark2)
+ */
+#include "gl-headers.h"
+
+void* (*GLExtensions::MapBuffer) (GLenum target, GLenum access) = 0;
+GLboolean (*GLExtensions::UnmapBuffer) (GLenum target) = 0;
+
+bool
+GLExtensions::support(const std::string &ext)
+{
+    std::string ext_string;
+    const char* exts = reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS));
+    if (exts) {
+        ext_string = exts;
+    }
+
+    const size_t ext_size = ext.size();
+    size_t pos = 0;
+
+    while ((pos = ext_string.find(ext, pos)) != std::string::npos) {
+        char c = ext_string[pos + ext_size];
+        if (c == ' ' || c == '\0')
+            break;
+    }
+
+    return pos != std::string::npos;
+}
diff --git a/src/gl-headers.h b/src/gl-headers.h
new file mode 100644
index 0000000..e9a9818
--- /dev/null
+++ b/src/gl-headers.h
@@ -0,0 +1,71 @@
+/*
+ * Copyright © 2010-2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis (glmark2)
+ */
+#ifndef GLMARK2_GL_HEADERS_H_
+#define GLMARK2_GL_HEADERS_H_
+
+#define GL_GLEXT_PROTOTYPES
+
+#if USE_GL
+#include <GL/gl.h>
+#include <GL/glext.h>
+#ifndef GL_RGB565
+#define GL_RGB565 0x8D62
+#endif
+#elif USE_GLESv2
+#include <GLES2/gl2.h>
+#include <GLES2/gl2ext.h>
+#ifndef GL_WRITE_ONLY
+#define GL_WRITE_ONLY GL_WRITE_ONLY_OES
+#endif
+#ifndef GL_DEPTH_COMPONENT24
+#define GL_DEPTH_COMPONENT24 GL_DEPTH_COMPONENT24_OES
+#endif
+#ifndef GL_DEPTH_COMPONENT32
+#define GL_DEPTH_COMPONENT32 GL_DEPTH_COMPONENT32_OES
+#endif
+#ifndef GL_RGBA8
+#define GL_RGBA8 GL_RGBA8_OES
+#endif
+#ifndef GL_RGB8
+#define GL_RGB8 GL_RGB8_OES
+#endif
+#endif
+
+#include <string>
+
+/**
+ * Struct that holds pointers to functions that belong to extensions
+ * in either GL2.0 or GLES2.0.
+ */
+struct GLExtensions {
+    /**
+     * Whether the current context has support for a GL extension.
+     *
+     * @return true if the extension is supported
+     */
+    static bool support(const std::string &ext);
+
+    static void* (*MapBuffer) (GLenum target, GLenum access);
+    static GLboolean (*UnmapBuffer) (GLenum target);
+};
+
+#endif
diff --git a/src/gl-visual-config.cpp b/src/gl-visual-config.cpp
new file mode 100644
index 0000000..dbd87d2
--- /dev/null
+++ b/src/gl-visual-config.cpp
@@ -0,0 +1,123 @@
+/*
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis <alexandros.frantzis@linaro.org>
+ */
+#include "gl-visual-config.h"
+#include "util.h"
+#include "log.h"
+
+#include <vector>
+
+GLVisualConfig::GLVisualConfig(const std::string &s) :
+    red(1), green(1), blue(1), alpha(1), depth(1), stencil(0), buffer(1)
+{
+    std::vector<std::string> elems;
+
+    Util::split(s, ':', elems, Util::SplitModeNormal);
+
+    for (std::vector<std::string>::const_iterator iter = elems.begin();
+         iter != elems.end();
+         iter++)
+    {
+        std::vector<std::string> opt;
+
+        Util::split(*iter, '=', opt, Util::SplitModeNormal);
+        if (opt.size() == 2) {
+            if (opt[0] == "r" || opt[0] == "red")
+                red = Util::fromString<int>(opt[1]);
+            else if (opt[0] == "g" || opt[0] == "green")
+                green = Util::fromString<int>(opt[1]);
+            else if (opt[0] == "b" || opt[0] == "blue")
+                blue = Util::fromString<int>(opt[1]);
+            else if (opt[0] == "a" || opt[0] == "alpha")
+                alpha = Util::fromString<int>(opt[1]);
+            else if (opt[0] == "d" || opt[0] == "depth")
+                depth = Util::fromString<int>(opt[1]);
+            else if (opt[0] == "s" || opt[0] == "stencil")
+                stencil = Util::fromString<int>(opt[1]);
+            else if (opt[0] == "buf" || opt[0] == "buffer")
+                buffer = Util::fromString<int>(opt[1]);
+        }
+        else
+            Log::info("Warning: ignoring invalid option string '%s' "
+                      "in GLVisualConfig description\n",
+                      iter->c_str());
+    }
+}
+
+int
+GLVisualConfig::match_score(const GLVisualConfig &target) const
+{
+    int score(0);
+
+    /* 
+     * R,G,B,A integer values are at most 8 bits wide (for current widespread
+     * hardware), so we need to scale them by 4 to get them in the [0,32] range.
+     */
+    score += score_component(red, target.red, 4);
+    score += score_component(green, target.green, 4);
+    score += score_component(blue, target.blue, 4);
+    score += score_component(alpha, target.alpha, 4);
+    score += score_component(depth, target.depth, 1);
+    score += score_component(stencil, target.stencil, 0);
+    score += score_component(buffer, target.buffer, 1);
+
+    return score;
+}
+
+int
+GLVisualConfig::score_component(int component, int target, int scale) const
+{
+    /* 
+     * The maximum (positive) score that can be returned is based
+     * on the maximum bit width of the components. We assume this to
+     * be 32 bits, which is a reasonable assumption for current platforms.
+     */
+    static const int MAXIMUM_COMPONENT_SCORE = 32;
+    static const int UNACCEPTABLE_COMPONENT_PENALTY = -1000;
+    int score(0);
+
+    if ((component > 0 && target == 0) ||
+        (component == 0 && target > 0))
+    {
+        /* 
+         * Penalize components that are not present but have been requested,
+         * and components that have been excluded but are present.
+         */
+        score = UNACCEPTABLE_COMPONENT_PENALTY;
+    }
+    else if (component == target)
+    {
+        /* Reward exact matches with the maximum per component score */
+        score = MAXIMUM_COMPONENT_SCORE;
+    }
+    else
+    {
+        /* 
+         * Reward deeper than requested component values, penalize shallower
+         * than requested component values. Because the ranges of component
+         * values vary we use a scaling factor to even them out, so that the
+         * score for all components ranges from [0,MAXIMUM_COMPONENT_SCORE).
+         */
+        score = scale * (component - target);
+    }
+
+    return score;
+}
diff --git a/src/gl-visual-config.h b/src/gl-visual-config.h
new file mode 100644
index 0000000..dc035cd
--- /dev/null
+++ b/src/gl-visual-config.h
@@ -0,0 +1,65 @@
+/*
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis <alexandros.frantzis@linaro.org>
+ */
+#ifndef GLMARK2_GL_VISUAL_CONFIG_H_
+#define GLMARK2_GL_VISUAL_CONFIG_H_
+
+#include <string>
+
+/**
+ * Configuration parameters for a GL visual
+ */
+class GLVisualConfig
+{
+public:
+    GLVisualConfig():
+        red(1), green(1), blue(1), alpha(1), depth(1), stencil(0), buffer(1) {}
+    GLVisualConfig(int r, int g, int b, int a, int d, int s, int buf):
+        red(r), green(g), blue(b), alpha(a), depth(d), stencil(s), buffer(buf) {}
+    GLVisualConfig(const std::string &s);
+
+    /**
+     * How well a GLVisualConfig matches another target config.
+     *
+     * The returned score has no meaning on its own. Its only purpose is
+     * to allow comparison of how well different configs match a target
+     * config, with a higher scores denoting a better match.
+     *
+     * Also note that this operation is not commutative:
+     * a.match_score(b) != b.match_score(a)
+     *
+     * @return the match score
+     */
+    int match_score(const GLVisualConfig &target) const;
+
+    int red;
+    int green;
+    int blue;
+    int alpha;
+    int depth;
+    int stencil;
+    int buffer;
+
+private:
+    int score_component(int component, int target, int scale) const;
+};
+
+#endif
diff --git a/src/image-reader.cpp b/src/image-reader.cpp
new file mode 100644
index 0000000..58407bc
--- /dev/null
+++ b/src/image-reader.cpp
@@ -0,0 +1,386 @@
+/*
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis
+ */
+#include <cstdio>
+#include <png.h>
+#include <jpeglib.h>
+#include <memory>
+
+#include "image-reader.h"
+#include "log.h"
+#include "util.h"
+
+/*******
+ * PNG *
+ *******/
+
+struct PNGReaderPrivate
+{
+    PNGReaderPrivate() :
+        png(0), info(0), rows(0), png_error(0),
+        current_row(0), row_stride(0) {}
+
+    static void png_read_fn(png_structp png_ptr, png_bytep data, png_size_t length)
+    {
+        std::istream *is = reinterpret_cast<std::istream*>(png_get_io_ptr(png_ptr));
+        is->read(reinterpret_cast<char *>(data), length);
+    }
+
+    png_structp png;
+    png_infop info;
+    png_bytepp rows;
+    bool png_error;
+    unsigned int current_row;
+    unsigned int row_stride;
+};
+
+PNGReader::PNGReader(const std::string& filename):
+    priv_(new PNGReaderPrivate())
+{
+    priv_->png_error = !init(filename);
+}
+
+PNGReader::~PNGReader()
+{
+    finish();
+    delete priv_;
+}
+
+bool
+PNGReader::error()
+{
+    return priv_->png_error;
+}
+
+bool
+PNGReader::nextRow(unsigned char *dst)
+{
+    bool ret;
+
+    if (priv_->current_row < height()) {
+        memcpy(dst, priv_->rows[priv_->current_row], priv_->row_stride);
+        priv_->current_row++;
+        ret = true;
+    }
+    else {
+        ret = false;
+    }
+
+    return ret;
+}
+
+unsigned int
+PNGReader::width() const
+{ 
+    return png_get_image_width(priv_->png, priv_->info);
+}
+
+unsigned int
+PNGReader::height() const
+{ 
+    return png_get_image_height(priv_->png, priv_->info);
+}
+
+unsigned int
+PNGReader::pixelBytes() const
+{
+    if (png_get_color_type(priv_->png, priv_->info) == PNG_COLOR_TYPE_RGB)
+    {
+        return 3;
+    }
+    return 4;
+}
+
+
+bool
+PNGReader::init(const std::string& filename)
+{
+    static const int png_transforms = PNG_TRANSFORM_STRIP_16 |
+                                      PNG_TRANSFORM_GRAY_TO_RGB |
+                                      PNG_TRANSFORM_PACKING |
+                                      PNG_TRANSFORM_EXPAND;
+
+    Log::debug("Reading PNG file %s\n", filename.c_str());
+
+    const std::auto_ptr<std::istream> is_ptr(Util::get_resource(filename));
+    if (!(*is_ptr)) {
+        Log::error("Cannot open file %s!\n", filename.c_str());
+        return false;
+    }
+
+    /* Set up all the libpng structs we need */
+    priv_->png = png_create_read_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
+    if (!priv_->png) {
+        Log::error("Couldn't create libpng read struct\n");
+        return false;
+    }
+
+    priv_->info = png_create_info_struct(priv_->png);
+    if (!priv_->info) {
+        Log::error("Couldn't create libpng info struct\n");
+        return false;
+    }
+
+    /* Set up libpng error handling */
+    if (setjmp(png_jmpbuf(priv_->png))) {
+        Log::error("libpng error while reading file %s\n", filename.c_str());
+        return false;
+    }
+
+    /* Read the image information and data */
+    png_set_read_fn(priv_->png, reinterpret_cast<voidp>(is_ptr.get()),
+                    PNGReaderPrivate::png_read_fn);
+
+    png_read_png(priv_->png, priv_->info, png_transforms, 0);
+
+    priv_->rows = png_get_rows(priv_->png, priv_->info);
+
+    priv_->current_row = 0;
+    priv_->row_stride = width() * pixelBytes();
+
+    return true;
+}
+
+void
+PNGReader::finish()
+{
+    if (priv_->png)
+    {
+        png_destroy_read_struct(&priv_->png, &priv_->info, 0);
+    }
+}
+
+
+/********
+ * JPEG *
+ ********/
+
+struct JPEGErrorMgr
+{
+    struct jpeg_error_mgr pub;
+    jmp_buf jmp_buffer;
+
+    JPEGErrorMgr()
+    {
+        jpeg_std_error(&pub);
+        pub.error_exit = error_exit;
+    }
+
+    static void error_exit(j_common_ptr cinfo)
+    {
+        JPEGErrorMgr *err =
+            reinterpret_cast<JPEGErrorMgr *>(cinfo->err);
+
+        char buffer[JMSG_LENGTH_MAX];
+
+        /* Create the message */
+        (*cinfo->err->format_message)(cinfo, buffer);
+        std::string msg(std::string(buffer) + "\n");
+        Log::error(msg.c_str());
+
+        longjmp(err->jmp_buffer, 1);
+    }
+};
+
+struct JPEGIStreamSourceMgr
+{
+    static const int BUFFER_SIZE = 4096;
+    struct jpeg_source_mgr pub;
+    std::istream *is;
+    JOCTET buffer[BUFFER_SIZE];
+
+    JPEGIStreamSourceMgr(const std::string& filename) : is(0)
+    {
+        is = Util::get_resource(filename);
+
+        /* Fill in jpeg_source_mgr pub struct */
+        pub.init_source = init_source;
+        pub.fill_input_buffer = fill_input_buffer;
+        pub.skip_input_data = skip_input_data;
+        pub.resync_to_restart = jpeg_resync_to_restart; /* use default method */
+        pub.term_source = term_source;
+        pub.bytes_in_buffer = 0; /* forces fill_input_buffer on first read */
+        pub.next_input_byte = NULL; /* until buffer loaded */
+    }
+
+    ~JPEGIStreamSourceMgr()
+    {
+        delete is;
+    }
+
+    bool error()
+    {
+        return !is || (is->fail() && !is->eof());
+    }
+
+    static void init_source(j_decompress_ptr cinfo)
+    {
+        static_cast<void>(cinfo);
+    }
+
+    static boolean fill_input_buffer(j_decompress_ptr cinfo)
+    {
+        JPEGIStreamSourceMgr *src =
+            reinterpret_cast<JPEGIStreamSourceMgr *>(cinfo->src);
+
+        src->is->read(reinterpret_cast<char *>(src->buffer), BUFFER_SIZE);
+
+        src->pub.next_input_byte = src->buffer;
+        src->pub.bytes_in_buffer = src->is->gcount();
+
+        /* 
+         * If the decoder needs more data, but we have no more bytes left to
+         * read mark the end of input.
+         */
+        if (src->pub.bytes_in_buffer == 0) {
+            src->pub.bytes_in_buffer = 2;
+            src->buffer[0] = 0xFF;
+            src->buffer[0] = JPEG_EOI;
+        }
+
+        return TRUE;
+    }
+
+    static void skip_input_data(j_decompress_ptr cinfo, long num_bytes)
+    {
+        JPEGIStreamSourceMgr *src =
+            reinterpret_cast<JPEGIStreamSourceMgr *>(cinfo->src);
+
+        if (num_bytes > 0) {
+            size_t n = static_cast<size_t>(num_bytes);
+            while (n > src->pub.bytes_in_buffer) {
+                n -= src->pub.bytes_in_buffer;
+                (*src->fill_input_buffer)(cinfo);
+            }
+            src->pub.next_input_byte += n;
+            src->pub.bytes_in_buffer -= n;
+        }
+    }
+
+    static void term_source(j_decompress_ptr cinfo)
+    {
+        static_cast<void>(cinfo);
+    }
+};
+
+struct JPEGReaderPrivate
+{
+    JPEGReaderPrivate(const std::string& filename) :
+        source_mgr(filename), jpeg_error(false) {}
+
+    struct jpeg_decompress_struct cinfo;
+    JPEGErrorMgr error_mgr;
+    JPEGIStreamSourceMgr source_mgr;
+    bool jpeg_error;
+};
+
+
+JPEGReader::JPEGReader(const std::string& filename) :
+    priv_(new JPEGReaderPrivate(filename))
+{
+    priv_->jpeg_error = !init(filename);
+}
+
+JPEGReader::~JPEGReader()
+{
+    finish();
+    delete priv_;
+}
+
+bool
+JPEGReader::error()
+{
+    return priv_->jpeg_error || priv_->source_mgr.error();
+}
+
+bool
+JPEGReader::nextRow(unsigned char *dst)
+{
+    bool ret = true;
+    unsigned char *buffer[1];
+    buffer[0] = dst;
+
+    /* Set up error handling */
+    if (setjmp(priv_->error_mgr.jmp_buffer)) {
+        return false;
+    }
+
+    /* While there are lines left, read next line */
+    if (priv_->cinfo.output_scanline < priv_->cinfo.output_height) {
+        jpeg_read_scanlines(&priv_->cinfo, buffer, 1);
+    }
+    else {
+        jpeg_finish_decompress(&priv_->cinfo);
+        ret = false;
+    }
+
+    return ret;
+}
+
+unsigned int
+JPEGReader::width() const
+{ 
+    return priv_->cinfo.output_width;
+}
+
+unsigned int
+JPEGReader::height() const
+{ 
+    return priv_->cinfo.output_height;
+}
+
+unsigned int
+JPEGReader::pixelBytes() const
+{ 
+    return priv_->cinfo.output_components;
+}
+
+bool
+JPEGReader::init(const std::string& filename)
+{
+    Log::debug("Reading JPEG file %s\n", filename.c_str());
+
+    /* Initialize error manager */
+    priv_->cinfo.err = reinterpret_cast<jpeg_error_mgr*>(&priv_->error_mgr);
+
+    if (setjmp(priv_->error_mgr.jmp_buffer)) {
+        return false;
+    }
+
+    jpeg_create_decompress(&priv_->cinfo);
+    priv_->cinfo.src = reinterpret_cast<jpeg_source_mgr*>(&priv_->source_mgr);
+
+    /* Read header */
+    jpeg_read_header(&priv_->cinfo, TRUE);
+
+    jpeg_start_decompress(&priv_->cinfo);
+
+    return true;
+}
+
+void
+JPEGReader::finish()
+{
+    jpeg_destroy_decompress(&priv_->cinfo);
+}
+
+
+
diff --git a/src/image-reader.h b/src/image-reader.h
new file mode 100644
index 0000000..f4d1fc8
--- /dev/null
+++ b/src/image-reader.h
@@ -0,0 +1,77 @@
+/*
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis
+ */
+#include <string>
+
+class ImageReader
+{
+public:
+    virtual bool error() = 0;
+    virtual bool nextRow(unsigned char *dst) = 0;
+    virtual unsigned int width() const = 0;
+    virtual unsigned int height() const = 0;
+    virtual unsigned int pixelBytes() const = 0;
+    virtual ~ImageReader() {}
+};
+
+class PNGReaderPrivate;
+
+class PNGReader : public ImageReader
+{
+public:
+    PNGReader(const std::string& filename);
+
+    virtual ~PNGReader();
+    bool error();
+    bool nextRow(unsigned char *dst);
+
+    unsigned int width() const;
+    unsigned int height() const;
+    unsigned int pixelBytes() const;
+
+private:
+    bool init(const std::string& filename);
+    void finish();
+
+    PNGReaderPrivate *priv_;
+};
+
+class JPEGReaderPrivate;
+
+class JPEGReader : public ImageReader
+{
+public:
+    JPEGReader(const std::string& filename);
+
+    virtual ~JPEGReader();
+    bool error();
+    bool nextRow(unsigned char *dst);
+    unsigned int width() const;
+    unsigned int height() const;
+    unsigned int pixelBytes() const;
+
+private:
+    bool init(const std::string& filename);
+    void finish();
+
+    JPEGReaderPrivate *priv_;
+};
+
diff --git a/src/libjpeg-turbo/README b/src/libjpeg-turbo/README
new file mode 100644
index 0000000..0e9b429
--- /dev/null
+++ b/src/libjpeg-turbo/README
@@ -0,0 +1,290 @@
+libjpeg-turbo note:  This file contains portions of the libjpeg v6b and v8
+README files, with additional wordsmithing by The libjpeg-turbo Project.
+It is included only for reference, as some parts of it may not apply to
+libjpeg-turbo.  Please see README-turbo.txt for information specific to
+libjpeg-turbo.
+
+
+The Independent JPEG Group's JPEG software
+==========================================
+
+This distribution contains a release of the Independent JPEG Group's free JPEG
+software.  You are welcome to redistribute this software and to use it for any
+purpose, subject to the conditions under LEGAL ISSUES, below.
+
+This software is the work of Tom Lane, Guido Vollbeding, Philip Gladstone,
+Bill Allombert, Jim Boucher, Lee Crocker, Bob Friesenhahn, Ben Jackson,
+Julian Minguillon, Luis Ortiz, George Phillips, Davide Rossi, Ge' Weijers,
+and other members of the Independent JPEG Group.
+
+IJG is not affiliated with the official ISO JPEG standards committee.
+
+
+DOCUMENTATION ROADMAP
+=====================
+
+This file contains the following sections:
+
+OVERVIEW            General description of JPEG and the IJG software.
+LEGAL ISSUES        Copyright, lack of warranty, terms of distribution.
+REFERENCES          Where to learn more about JPEG.
+ARCHIVE LOCATIONS   Where to find newer versions of this software.
+FILE FORMAT WARS    Software *not* to get.
+TO DO               Plans for future IJG releases.
+
+Other documentation files in the distribution are:
+
+User documentation:
+  install.txt       How to configure and install the IJG software.
+  usage.txt         Usage instructions for cjpeg, djpeg, jpegtran,
+                    rdjpgcom, and wrjpgcom.
+  *.1               Unix-style man pages for programs (same info as usage.txt).
+  wizard.txt        Advanced usage instructions for JPEG wizards only.
+  change.log        Version-to-version change highlights.
+Programmer and internal documentation:
+  libjpeg.txt       How to use the JPEG library in your own programs.
+  example.c         Sample code for calling the JPEG library.
+  structure.txt     Overview of the JPEG library's internal structure.
+  filelist.txt      Road map of IJG files.
+  coderules.txt     Coding style rules --- please read if you contribute code.
+
+Please read at least the files install.txt and usage.txt.  Some information
+can also be found in the JPEG FAQ (Frequently Asked Questions) article.  See
+ARCHIVE LOCATIONS below to find out where to obtain the FAQ article.
+
+If you want to understand how the JPEG code works, we suggest reading one or
+more of the REFERENCES, then looking at the documentation files (in roughly
+the order listed) before diving into the code.
+
+
+OVERVIEW
+========
+
+This package contains C software to implement JPEG image encoding, decoding,
+and transcoding.  JPEG (pronounced "jay-peg") is a standardized compression
+method for full-color and gray-scale images.  JPEG's strong suit is compressing
+photographic images or other types of images that have smooth color and
+brightness transitions between neighboring pixels.  Images with sharp lines or
+other abrupt features may not compress well with JPEG, and a higher JPEG
+quality may have to be used to avoid visible compression artifacts with such
+images.
+
+JPEG is lossy, meaning that the output pixels are not necessarily identical to
+the input pixels.  However, on photographic content and other "smooth" images,
+very good compression ratios can be obtained with no visible compression
+artifacts, and extremely high compression ratios are possible if you are
+willing to sacrifice image quality (by reducing the "quality" setting in the
+compressor.)
+
+This software implements JPEG baseline, extended-sequential, and progressive
+compression processes.  Provision is made for supporting all variants of these
+processes, although some uncommon parameter settings aren't implemented yet.
+We have made no provision for supporting the hierarchical or lossless
+processes defined in the standard.
+
+We provide a set of library routines for reading and writing JPEG image files,
+plus two sample applications "cjpeg" and "djpeg", which use the library to
+perform conversion between JPEG and some other popular image file formats.
+The library is intended to be reused in other applications.
+
+In order to support file conversion and viewing software, we have included
+considerable functionality beyond the bare JPEG coding/decoding capability;
+for example, the color quantization modules are not strictly part of JPEG
+decoding, but they are essential for output to colormapped file formats or
+colormapped displays.  These extra functions can be compiled out of the
+library if not required for a particular application.
+
+We have also included "jpegtran", a utility for lossless transcoding between
+different JPEG processes, and "rdjpgcom" and "wrjpgcom", two simple
+applications for inserting and extracting textual comments in JFIF files.
+
+The emphasis in designing this software has been on achieving portability and
+flexibility, while also making it fast enough to be useful.  In particular,
+the software is not intended to be read as a tutorial on JPEG.  (See the
+REFERENCES section for introductory material.)  Rather, it is intended to
+be reliable, portable, industrial-strength code.  We do not claim to have
+achieved that goal in every aspect of the software, but we strive for it.
+
+We welcome the use of this software as a component of commercial products.
+No royalty is required, but we do ask for an acknowledgement in product
+documentation, as described under LEGAL ISSUES.
+
+
+LEGAL ISSUES
+============
+
+In plain English:
+
+1. We don't promise that this software works.  (But if you find any bugs,
+   please let us know!)
+2. You can use this software for whatever you want.  You don't have to pay us.
+3. You may not pretend that you wrote this software.  If you use it in a
+   program, you must acknowledge somewhere in your documentation that
+   you've used the IJG code.
+
+In legalese:
+
+The authors make NO WARRANTY or representation, either express or implied,
+with respect to this software, its quality, accuracy, merchantability, or
+fitness for a particular purpose.  This software is provided "AS IS", and you,
+its user, assume the entire risk as to its quality and accuracy.
+
+This software is copyright (C) 1991-2010, Thomas G. Lane, Guido Vollbeding.
+All Rights Reserved except as specified below.
+
+Permission is hereby granted to use, copy, modify, and distribute this
+software (or portions thereof) for any purpose, without fee, subject to these
+conditions:
+(1) If any part of the source code for this software is distributed, then this
+README file must be included, with this copyright and no-warranty notice
+unaltered; and any additions, deletions, or changes to the original files
+must be clearly indicated in accompanying documentation.
+(2) If only executable code is distributed, then the accompanying
+documentation must state that "this software is based in part on the work of
+the Independent JPEG Group".
+(3) Permission for use of this software is granted only if the user accepts
+full responsibility for any undesirable consequences; the authors accept
+NO LIABILITY for damages of any kind.
+
+These conditions apply to any software derived from or based on the IJG code,
+not just to the unmodified library.  If you use our work, you ought to
+acknowledge us.
+
+Permission is NOT granted for the use of any IJG author's name or company name
+in advertising or publicity relating to this software or products derived from
+it.  This software may be referred to only as "the Independent JPEG Group's
+software".
+
+We specifically permit and encourage the use of this software as the basis of
+commercial products, provided that all warranty or liability claims are
+assumed by the product vendor.
+
+
+ansi2knr.c is included in this distribution by permission of L. Peter Deutsch,
+sole proprietor of its copyright holder, Aladdin Enterprises of Menlo Park, CA.
+ansi2knr.c is NOT covered by the above copyright and conditions, but instead
+by the usual distribution terms of the Free Software Foundation; principally,
+that you must include source code if you redistribute it.  (See the file
+ansi2knr.c for full details.)  However, since ansi2knr.c is not needed as part
+of any program generated from the IJG code, this does not limit you more than
+the foregoing paragraphs do.
+
+The Unix configuration script "configure" was produced with GNU Autoconf.
+It is copyright by the Free Software Foundation but is freely distributable.
+The same holds for its supporting scripts (config.guess, config.sub,
+ltmain.sh).  Another support script, install-sh, is copyright by X Consortium
+but is also freely distributable.
+
+The IJG distribution formerly included code to read and write GIF files.
+To avoid entanglement with the Unisys LZW patent, GIF reading support has
+been removed altogether, and the GIF writer has been simplified to produce
+"uncompressed GIFs".  This technique does not use the LZW algorithm; the
+resulting GIF files are larger than usual, but are readable by all standard
+GIF decoders.
+
+We are required to state that
+    "The Graphics Interchange Format(c) is the Copyright property of
+    CompuServe Incorporated.  GIF(sm) is a Service Mark property of
+    CompuServe Incorporated."
+
+
+REFERENCES
+==========
+
+We recommend reading one or more of these references before trying to
+understand the innards of the JPEG software.
+
+The best short technical introduction to the JPEG compression algorithm is
+	Wallace, Gregory K.  "The JPEG Still Picture Compression Standard",
+	Communications of the ACM, April 1991 (vol. 34 no. 4), pp. 30-44.
+(Adjacent articles in that issue discuss MPEG motion picture compression,
+applications of JPEG, and related topics.)  If you don't have the CACM issue
+handy, a PostScript file containing a revised version of Wallace's article is
+available at http://www.ijg.org/files/wallace.ps.gz.  The file (actually
+a preprint for an article that appeared in IEEE Trans. Consumer Electronics)
+omits the sample images that appeared in CACM, but it includes corrections
+and some added material.  Note: the Wallace article is copyright ACM and IEEE,
+and it may not be used for commercial purposes.
+
+A somewhat less technical, more leisurely introduction to JPEG can be found in
+"The Data Compression Book" by Mark Nelson and Jean-loup Gailly, published by
+M&T Books (New York), 2nd ed. 1996, ISBN 1-55851-434-1.  This book provides
+good explanations and example C code for a multitude of compression methods
+including JPEG.  It is an excellent source if you are comfortable reading C
+code but don't know much about data compression in general.  The book's JPEG
+sample code is far from industrial-strength, but when you are ready to look
+at a full implementation, you've got one here...
+
+The best currently available description of JPEG is the textbook "JPEG Still
+Image Data Compression Standard" by William B. Pennebaker and Joan L.
+Mitchell, published by Van Nostrand Reinhold, 1993, ISBN 0-442-01272-1.
+Price US$59.95, 638 pp.  The book includes the complete text of the ISO JPEG
+standards (DIS 10918-1 and draft DIS 10918-2).
+
+The original JPEG standard is divided into two parts, Part 1 being the actual
+specification, while Part 2 covers compliance testing methods.  Part 1 is
+titled "Digital Compression and Coding of Continuous-tone Still Images,
+Part 1: Requirements and guidelines" and has document numbers ISO/IEC IS
+10918-1, ITU-T T.81.  Part 2 is titled "Digital Compression and Coding of
+Continuous-tone Still Images, Part 2: Compliance testing" and has document
+numbers ISO/IEC IS 10918-2, ITU-T T.83.
+
+The JPEG standard does not specify all details of an interchangeable file
+format.  For the omitted details we follow the "JFIF" conventions, revision
+1.02.  JFIF 1.02 has been adopted as an Ecma International Technical Report
+and thus received a formal publication status.  It is available as a free
+download in PDF format from
+http://www.ecma-international.org/publications/techreports/E-TR-098.htm.
+A PostScript version of the JFIF document is available at
+http://www.ijg.org/files/jfif.ps.gz.  There is also a plain text version at
+http://www.ijg.org/files/jfif.txt.gz, but it is missing the figures.
+
+The TIFF 6.0 file format specification can be obtained by FTP from
+ftp://ftp.sgi.com/graphics/tiff/TIFF6.ps.gz.  The JPEG incorporation scheme
+found in the TIFF 6.0 spec of 3-June-92 has a number of serious problems.
+IJG does not recommend use of the TIFF 6.0 design (TIFF Compression tag 6).
+Instead, we recommend the JPEG design proposed by TIFF Technical Note #2
+(Compression tag 7).  Copies of this Note can be obtained from
+http://www.ijg.org/files/.  It is expected that the next revision
+of the TIFF spec will replace the 6.0 JPEG design with the Note's design.
+Although IJG's own code does not support TIFF/JPEG, the free libtiff library
+uses our library to implement TIFF/JPEG per the Note.
+
+
+ARCHIVE LOCATIONS
+=================
+
+The "official" archive site for this software is www.ijg.org.
+The most recent released version can always be found there in
+directory "files".  This particular version will be archived as
+http://www.ijg.org/files/jpegsrc.v8d.tar.gz, and in Windows-compatible
+"zip" archive format as http://www.ijg.org/files/jpegsr8d.zip.
+
+The JPEG FAQ (Frequently Asked Questions) article is a source of some
+general information about JPEG.
+It is available on the World Wide Web at http://www.faqs.org/faqs/jpeg-faq/
+and other news.answers archive sites, including the official news.answers
+archive at rtfm.mit.edu: ftp://rtfm.mit.edu/pub/usenet/news.answers/jpeg-faq/.
+If you don't have Web or FTP access, send e-mail to mail-server@rtfm.mit.edu
+with body
+	send usenet/news.answers/jpeg-faq/part1
+	send usenet/news.answers/jpeg-faq/part2
+
+
+FILE FORMAT WARS
+================
+
+The ISO JPEG standards committee actually promotes different formats like
+"JPEG 2000" or "JPEG XR", which are incompatible with original DCT-based
+JPEG.  IJG therefore does not support these formats (see REFERENCES).  Indeed,
+one of the original reasons for developing this free software was to help
+force convergence on common, interoperable format standards for JPEG files.
+Don't use an incompatible file format!
+(In any case, our decoder will remain capable of reading existing JPEG
+image files indefinitely.)
+
+
+TO DO
+=====
+
+Please send bug reports, offers of help, etc. to jpeg-info@jpegclub.org.
diff --git a/src/libjpeg-turbo/README-turbo.txt b/src/libjpeg-turbo/README-turbo.txt
new file mode 100755
index 0000000..899a368
--- /dev/null
+++ b/src/libjpeg-turbo/README-turbo.txt
@@ -0,0 +1,361 @@
+*******************************************************************************
+**     Background
+*******************************************************************************
+
+libjpeg-turbo is a derivative of libjpeg that uses SIMD instructions (MMX,
+SSE2, NEON) to accelerate baseline JPEG compression and decompression on x86,
+x86-64, and ARM systems.  On such systems, libjpeg-turbo is generally 2-4x as
+fast as the unmodified version of libjpeg, all else being equal.
+
+libjpeg-turbo was originally based on libjpeg/SIMD by Miyasaka Masaru, but
+the TigerVNC and VirtualGL projects made numerous enhancements to the codec in
+2009, including improved support for Mac OS X, 64-bit support, support for
+32-bit and big-endian pixel formats (RGBX, XBGR, etc.), accelerated Huffman
+encoding/decoding, and various bug fixes.  The goal was to produce a fully
+open-source codec that could replace the partially closed-source TurboJPEG/IPP
+codec used by VirtualGL and TurboVNC.  libjpeg-turbo generally achieves 80-120%
+of the performance of TurboJPEG/IPP.  It is faster in some areas but slower in
+others.
+
+In early 2010, libjpeg-turbo spun off into its own independent project, with
+the goal of making high-speed JPEG compression/decompression technology
+available to a broader range of users and developers.
+
+
+*******************************************************************************
+**     License
+*******************************************************************************
+
+Most of libjpeg-turbo inherits the non-restrictive, BSD-style license used by
+libjpeg (see README.)  The TurboJPEG/OSS wrapper (both C and Java versions) and
+associated test programs bear a similar license, which is reproduced below:
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+- Redistributions of source code must retain the above copyright notice,
+  this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+- Neither the name of the libjpeg-turbo Project nor the names of its
+  contributors may be used to endorse or promote products derived from this
+  software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS",
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+
+
+*******************************************************************************
+**     Using libjpeg-turbo
+*******************************************************************************
+
+libjpeg-turbo includes two APIs that can be used to compress and decompress
+JPEG images:
+
+  TurboJPEG API:  This API provides an easy-to-use interface for compressing
+  and decompressing JPEG images in memory.  It also provides some functionality
+  that would not be straightforward to achieve using the underlying libjpeg
+  API, such as generating planar YUV images and performing multiple
+  simultaneous lossless transforms on an image.  The Java interface for
+  libjpeg-turbo is written on top of the TurboJPEG API.
+
+  libjpeg API:  This is the de facto industry-standard API for compressing and
+  decompressing JPEG images.  It is more difficult to use than the TurboJPEG
+  API but also more powerful.  libjpeg-turbo is both API/ABI-compatible and
+  mathematically compatible with libjpeg v6b.  It can also optionally be
+  configured to be API/ABI-compatible with libjpeg v7 and v8 (see below.)
+
+
+=============================
+Replacing libjpeg at Run Time
+=============================
+
+If a Unix application is dynamically linked with libjpeg, then you can replace
+libjpeg with libjpeg-turbo at run time by manipulating LD_LIBRARY_PATH.
+For instance:
+
+  [Using libjpeg]
+  > time cjpeg <vgl_5674_0098.ppm >vgl_5674_0098.jpg
+  real  0m0.392s
+  user  0m0.074s
+  sys   0m0.020s
+
+  [Using libjpeg-turbo]
+  > export LD_LIBRARY_PATH=/opt/libjpeg-turbo/{lib}:$LD_LIBRARY_PATH
+  > time cjpeg <vgl_5674_0098.ppm >vgl_5674_0098.jpg
+  real  0m0.109s
+  user  0m0.029s
+  sys   0m0.010s
+
+NOTE: {lib} can be lib, lib32, lib64, or lib/64, depending on the O/S and
+architecture.
+
+System administrators can also replace the libjpeg sym links in /usr/{lib} with
+links to the libjpeg-turbo dynamic library located in /opt/libjpeg-turbo/{lib}.
+This will effectively accelerate every application that uses the libjpeg
+dynamic library on the system.
+
+The libjpeg-turbo SDK for Visual C++ installs the libjpeg-turbo DLL
+(jpeg62.dll, jpeg7.dll, or jpeg8.dll, depending on whether it was built with
+libjpeg v6b, v7, or v8 emulation) into c:\libjpeg-turbo[64]\bin, and the PATH
+environment variable can be modified such that this directory is searched
+before any others that might contain a libjpeg DLL.  However, if a libjpeg
+DLL exists in an application's install directory, then Windows will load this
+DLL first whenever the application is launched.  Thus, if an application ships
+with jpeg62.dll, jpeg7.dll, or jpeg8.dll, then back up the application's
+version of this DLL and copy c:\libjpeg-turbo[64]\bin\jpeg*.dll into the
+application's install directory to accelerate it.
+
+The version of the libjpeg-turbo DLL distributed in the libjpeg-turbo SDK for
+Visual C++ requires the Visual C++ 2008 C run-time DLL (msvcr90.dll).
+msvcr90.dll ships with more recent versions of Windows, but users of older
+Windows releases can obtain it from the Visual C++ 2008 Redistributable
+Package, which is available as a free download from Microsoft's web site.
+
+NOTE:  Features of libjpeg that require passing a C run-time structure, such
+as a file handle, from an application to libjpeg will probably not work with
+the version of the libjpeg-turbo DLL distributed in the libjpeg-turbo SDK for
+Visual C++, unless the application is also built to use the Visual C++ 2008 C
+run-time DLL.  In particular, this affects jpeg_stdio_dest() and
+jpeg_stdio_src().
+
+Mac applications typically embed their own copies of the libjpeg dylib inside
+the (hidden) application bundle, so it is not possible to globally replace
+libjpeg on OS X systems.  If an application uses a shared library version of
+libjpeg, then it may be possible to replace the application's version of it.
+This would generally involve copying libjpeg.*.dylib from libjpeg-turbo into
+the appropriate place in the application bundle and using install_name_tool to
+repoint the dylib to the new directory.  This requires an advanced knowledge of
+OS X and would not survive an upgrade or a re-install of the application.
+Thus, it is not recommended for most users.
+
+=======================
+Replacing TurboJPEG/IPP
+=======================
+
+libjpeg-turbo is a drop-in replacement for the TurboJPEG/IPP SDK used by
+VirtualGL 2.1.x and TurboVNC 0.6 (and prior.)  libjpeg-turbo contains a wrapper
+library (TurboJPEG/OSS) that emulates the TurboJPEG API using libjpeg-turbo
+instead of the closed-source Intel Performance Primitives.  You can replace the
+TurboJPEG/IPP package on Linux systems with the libjpeg-turbo package in order
+to make existing releases of VirtualGL 2.1.x and TurboVNC 0.x use the new codec
+at run time.  Note that the 64-bit libjpeg-turbo packages contain only 64-bit
+binaries, whereas the TurboJPEG/IPP 64-bit packages contained both 64-bit and
+32-bit binaries.  Thus, to replace a TurboJPEG/IPP 64-bit package, install
+both the 64-bit and 32-bit versions of libjpeg-turbo.
+
+You can also build the VirtualGL 2.1.x and TurboVNC 0.6 source code with
+the libjpeg-turbo SDK instead of TurboJPEG/IPP.  It should work identically.
+libjpeg-turbo also includes static library versions of TurboJPEG/OSS, which
+are used to build VirtualGL 2.2 and TurboVNC 1.0 and later.
+
+========================================
+Using libjpeg-turbo in Your Own Programs
+========================================
+
+For the most part, libjpeg-turbo should work identically to libjpeg, so in
+most cases, an application can be built against libjpeg and then run against
+libjpeg-turbo.  On Unix systems (including Cygwin), you can build against
+libjpeg-turbo instead of libjpeg by setting
+
+  CPATH=/opt/libjpeg-turbo/include
+  and
+  LIBRARY_PATH=/opt/libjpeg-turbo/{lib}
+
+({lib} = lib32 or lib64, depending on whether you are building a 32-bit or a
+64-bit application.)
+
+If using MinGW, then set
+
+  CPATH=/c/libjpeg-turbo-gcc[64]/include
+  and
+  LIBRARY_PATH=/c/libjpeg-turbo-gcc[64]/lib
+
+Building against libjpeg-turbo is useful, for instance, if you want to build an
+application that leverages the libjpeg-turbo colorspace extensions (see below.)
+On Linux and Solaris systems, you would still need to manipulate
+LD_LIBRARY_PATH or create appropriate sym links to use libjpeg-turbo at run
+time.  On such systems, you can pass -R /opt/libjpeg-turbo/{lib} to the linker
+to force the use of libjpeg-turbo at run time rather than libjpeg (also useful
+if you want to leverage the colorspace extensions), or you can link against the
+libjpeg-turbo static library.
+
+To force a Linux, Solaris, or MinGW application to link against the static
+version of libjpeg-turbo, you can use the following linker options:
+
+  -Wl,-Bstatic -ljpeg -Wl,-Bdynamic
+
+On OS X, simply add /opt/libjpeg-turbo/lib/libjpeg.a to the linker command
+line (this also works on Linux and Solaris.)
+
+To build Visual C++ applications using libjpeg-turbo, add
+c:\libjpeg-turbo[64]\include to the system or user INCLUDE environment
+variable and c:\libjpeg-turbo[64]\lib to the system or user LIB environment
+variable, and then link against either jpeg.lib (to use the DLL version of
+libjpeg-turbo) or jpeg-static.lib (to use the static version of libjpeg-turbo.)
+
+=====================
+Colorspace Extensions
+=====================
+
+libjpeg-turbo includes extensions that allow JPEG images to be compressed
+directly from (and decompressed directly to) buffers that use BGR, BGRX,
+RGBX, XBGR, and XRGB pixel ordering.  This is implemented with ten new
+colorspace constants:
+
+  JCS_EXT_RGB   /* red/green/blue */
+  JCS_EXT_RGBX  /* red/green/blue/x */
+  JCS_EXT_BGR   /* blue/green/red */
+  JCS_EXT_BGRX  /* blue/green/red/x */
+  JCS_EXT_XBGR  /* x/blue/green/red */
+  JCS_EXT_XRGB  /* x/red/green/blue */
+  JCS_EXT_RGBA  /* red/green/blue/alpha */
+  JCS_EXT_BGRA  /* blue/green/red/alpha */
+  JCS_EXT_ABGR  /* alpha/blue/green/red */
+  JCS_EXT_ARGB  /* alpha/red/green/blue */
+
+Setting cinfo.in_color_space (compression) or cinfo.out_color_space
+(decompression) to one of these values will cause libjpeg-turbo to read the
+red, green, and blue values from (or write them to) the appropriate position in
+the pixel when compressing from/decompressing to an RGB buffer.
+
+Your application can check for the existence of these extensions at compile
+time with:
+
+  #ifdef JCS_EXTENSIONS
+
+At run time, attempting to use these extensions with a version of libjpeg
+that doesn't support them will result in a "Bogus input colorspace" error.
+
+When using the RGBX, BGRX, XBGR, and XRGB colorspaces during decompression, the
+X byte is undefined, and in order to ensure the best performance, libjpeg-turbo
+can set that byte to whatever value it wishes.  If an application expects the X
+byte to be used as an alpha channel, then it should specify JCS_EXT_RGBA,
+JCS_EXT_BGRA, JCS_EXT_ABGR, or JCS_EXT_ARGB.  When these colorspace constants
+are used, the X byte is guaranteed to be 0xFF, which is interpreted as opaque.
+
+Your application can check for the existence of the alpha channel colorspace
+extensions at compile time with:
+
+  #ifdef JCS_ALPHA_EXTENSIONS
+
+jcstest.c, located in the libjpeg-turbo source tree, demonstrates how to check
+for the existence of the colorspace extensions at compile time and run time.
+
+=================================
+libjpeg v7 and v8 API/ABI support
+=================================
+
+With libjpeg v7 and v8, new features were added that necessitated extending the
+compression and decompression structures.  Unfortunately, due to the exposed
+nature of those structures, extending them also necessitated breaking backward
+ABI compatibility with previous libjpeg releases.  Thus, programs that are
+built to use libjpeg v7 or v8 did not work with libjpeg-turbo, since it is
+based on the libjpeg v6b code base.  Although libjpeg v7 and v8 are still not
+as widely used as v6b, enough programs (including a few Linux distros) have
+made the switch that it was desirable to provide support for the libjpeg v7/v8
+API/ABI in libjpeg-turbo.  Although libjpeg-turbo can now be configured as a
+drop-in replacement for libjpeg v7 or v8, it should be noted that not all of
+the features in libjpeg v7 and v8 are supported (see below.)
+
+By passing an argument of --with-jpeg7 or --with-jpeg8 to configure, or an
+argument of -DWITH_JPEG7=1 or -DWITH_JPEG8=1 to cmake, you can build a version
+of libjpeg-turbo that emulates the libjpeg v7 or v8 API/ABI, so that programs
+that are built against libjpeg v7 or v8 can be run with libjpeg-turbo.  The
+following section describes which libjpeg v7+ features are supported and which
+aren't.
+
+libjpeg v7 and v8 Features:
+---------------------------
+
+Fully supported:
+
+-- cjpeg: Separate quality settings for luminance and chrominance
+   Note that the libpjeg v7+ API was extended to accommodate this feature only
+   for convenience purposes.  It has always been possible to implement this
+   feature with libjpeg v6b (see rdswitch.c for an example.)
+
+-- cjpeg: 32-bit BMP support
+
+-- jpegtran: lossless cropping
+
+-- jpegtran: -perfect option
+
+-- rdjpgcom: -raw option
+
+-- rdjpgcom: locale awareness
+
+
+Fully supported when using libjpeg v7/v8 emulation:
+
+-- libjpeg: In-memory source and destination managers
+
+
+Not supported:
+
+-- libjpeg: DCT scaling in compressor
+   cinfo.scale_num and cinfo.scale_denom are silently ignored.
+   There is no technical reason why DCT scaling cannot be supported, but
+   without the SmartScale extension (see below), it would only be able to
+   down-scale using ratios of 1/2, 8/15, 4/7, 8/13, 2/3, 8/11, 4/5, and 8/9,
+   which is of limited usefulness.
+
+-- libjpeg: SmartScale
+   cinfo.block_size is silently ignored.
+   SmartScale is an extension to the JPEG format that allows for DCT block
+   sizes other than 8x8.  It would be difficult to support this feature while
+   retaining backward compatibility with libjpeg v6b.
+
+-- libjpeg: IDCT scaling extensions in decompressor
+   libjpeg-turbo still supports IDCT scaling with scaling factors of 1/2, 1/4,
+   and 1/8 (same as libjpeg v6b.)
+
+-- libjpeg: Fancy downsampling in compressor
+   cinfo.do_fancy_downsampling is silently ignored.
+   This requires the DCT scaling feature, which is not supported.
+
+-- jpegtran: Scaling
+   This requires both the DCT scaling and SmartScale features, which are not
+   supported.
+
+-- Lossless RGB JPEG files
+   This requires the SmartScale feature, which is not supported.
+
+
+*******************************************************************************
+**     Performance pitfalls
+*******************************************************************************
+
+===============
+Restart Markers
+===============
+
+The optimized Huffman decoder in libjpeg-turbo does not handle restart markers
+in a way that makes the rest of the libjpeg infrastructure happy, so it is
+necessary to use the slow Huffman decoder when decompressing a JPEG image that
+has restart markers.  This can cause the decompression performance to drop by
+as much as 20%, but the performance will still be much greater than that of
+libjpeg.  Many consumer packages, such as PhotoShop, use restart markers when
+generating JPEG images, so images generated by those programs will experience
+this issue.
+
+===============================================
+Fast Integer Forward DCT at High Quality Levels
+===============================================
+
+The algorithm used by the SIMD-accelerated quantization function cannot produce
+correct results whenever the fast integer forward DCT is used along with a JPEG
+quality of 98-100.  Thus, libjpeg-turbo must use the non-SIMD quantization
+function in those cases.  This causes performance to drop by as much as 40%.
+It is therefore strongly advised that you use the slow integer forward DCT
+whenever encoding images with a JPEG quality of 98 or higher.
diff --git a/src/libjpeg-turbo/config.h b/src/libjpeg-turbo/config.h
new file mode 100644
index 0000000..7dc483e
--- /dev/null
+++ b/src/libjpeg-turbo/config.h
@@ -0,0 +1,137 @@
+/* config.h.  Generated from config.h.in by configure.  */
+/* config.h.in.  Generated from configure.ac by autoheader.  */
+
+/* Build number */
+#define BUILD "20120626"
+
+/* Support arithmetic encoding */
+#define C_ARITH_CODING_SUPPORTED 1
+
+/* Support arithmetic decoding */
+#define D_ARITH_CODING_SUPPORTED 1
+
+/* Define to 1 if you have the <dlfcn.h> header file. */
+#define HAVE_DLFCN_H 1
+
+/* Define to 1 if you have the <inttypes.h> header file. */
+#define HAVE_INTTYPES_H 1
+
+/* Define to 1 if you have the <jni.h> header file. */
+/* #undef HAVE_JNI_H */
+
+/* Define to 1 if you have the `memcpy' function. */
+#define HAVE_MEMCPY 1
+
+/* Define to 1 if you have the <memory.h> header file. */
+#define HAVE_MEMORY_H 1
+
+/* Define to 1 if you have the `memset' function. */
+#define HAVE_MEMSET 1
+
+/* Define if your compiler supports prototypes */
+#define HAVE_PROTOTYPES 1
+
+/* Define to 1 if you have the <stddef.h> header file. */
+#define HAVE_STDDEF_H 1
+
+/* Define to 1 if you have the <stdint.h> header file. */
+#define HAVE_STDINT_H 1
+
+/* Define to 1 if you have the <stdlib.h> header file. */
+#define HAVE_STDLIB_H 1
+
+/* Define to 1 if you have the <strings.h> header file. */
+#define HAVE_STRINGS_H 1
+
+/* Define to 1 if you have the <string.h> header file. */
+#define HAVE_STRING_H 1
+
+/* Define to 1 if you have the <sys/stat.h> header file. */
+#define HAVE_SYS_STAT_H 1
+
+/* Define to 1 if you have the <sys/types.h> header file. */
+#define HAVE_SYS_TYPES_H 1
+
+/* Define to 1 if you have the <unistd.h> header file. */
+#define HAVE_UNISTD_H 1
+
+/* Define to 1 if the system has the type `unsigned char'. */
+#define HAVE_UNSIGNED_CHAR 1
+
+/* Define to 1 if the system has the type `unsigned short'. */
+#define HAVE_UNSIGNED_SHORT 1
+
+/* Compiler does not support pointers to undefined structures. */
+/* #undef INCOMPLETE_TYPES_BROKEN */
+
+/* How to obtain function inlining. */
+#define INLINE __attribute__((always_inline))
+
+/* libjpeg API version */
+#define JPEG_LIB_VERSION 62
+
+/* libjpeg-turbo version */
+#define LIBJPEG_TURBO_VERSION 1.2.0
+
+/* Define to the sub-directory in which libtool stores uninstalled libraries.
+   */
+#define LT_OBJDIR ".libs/"
+
+/* Define if you have BSD-like bzero and bcopy */
+/* #undef NEED_BSD_STRINGS */
+
+/* Define if you need short function names */
+/* #undef NEED_SHORT_EXTERNAL_NAMES */
+
+/* Define if you have sys/types.h */
+#define NEED_SYS_TYPES_H 1
+
+/* Name of package */
+#define PACKAGE "libjpeg-turbo"
+
+/* Define to the address where bug reports for this package should be sent. */
+#define PACKAGE_BUGREPORT ""
+
+/* Define to the full name of this package. */
+#define PACKAGE_NAME "libjpeg-turbo"
+
+/* Define to the full name and version of this package. */
+#define PACKAGE_STRING "libjpeg-turbo 1.2.0"
+
+/* Define to the one symbol short name of this package. */
+#define PACKAGE_TARNAME "libjpeg-turbo"
+
+/* Define to the home page for this package. */
+#define PACKAGE_URL ""
+
+/* Define to the version of this package. */
+#define PACKAGE_VERSION "1.2.0"
+
+/* Define if shift is unsigned */
+/* #undef RIGHT_SHIFT_IS_UNSIGNED */
+
+/* Define to 1 if you have the ANSI C header files. */
+#define STDC_HEADERS 1
+
+/* Version number of package */
+#define VERSION "1.2.0"
+
+/* Use accelerated SIMD routines. */
+#define WITH_SIMD 1
+
+/* Define to 1 if type `char' is unsigned and you are not using gcc.  */
+#ifndef __CHAR_UNSIGNED__
+/* # undef __CHAR_UNSIGNED__ */
+#endif
+
+/* Define to empty if `const' does not conform to ANSI C. */
+/* #undef const */
+
+/* Define to `__inline__' or `__inline' if that's what the C compiler
+   calls it, or to nothing if 'inline' is not supported under any name.  */
+#ifndef __cplusplus
+/* #undef inline */
+#endif
+
+/* Define to `unsigned int' if <sys/types.h> does not define. */
+/* #undef size_t */
diff --git a/src/libjpeg-turbo/jaricom.c b/src/libjpeg-turbo/jaricom.c
new file mode 100644
index 0000000..f43e2ea
--- /dev/null
+++ b/src/libjpeg-turbo/jaricom.c
@@ -0,0 +1,153 @@
+/*
+ * jaricom.c
+ *
+ * Developed 1997-2009 by Guido Vollbeding.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains probability estimation tables for common use in
+ * arithmetic entropy encoding and decoding routines.
+ *
+ * This data represents Table D.2 in the JPEG spec (ISO/IEC IS 10918-1
+ * and CCITT Recommendation ITU-T T.81) and Table 24 in the JBIG spec
+ * (ISO/IEC IS 11544 and CCITT Recommendation ITU-T T.82).
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+
+/* The following #define specifies the packing of the four components
+ * into the compact INT32 representation.
+ * Note that this formula must match the actual arithmetic encoder
+ * and decoder implementation.  The implementation has to be changed
+ * if this formula is changed.
+ * The current organization is leaned on Markus Kuhn's JBIG
+ * implementation (jbig_tab.c).
+ */
+
+#define V(i,a,b,c,d) (((INT32)a << 16) | ((INT32)c << 8) | ((INT32)d << 7) | b)
+
+const INT32 jpeg_aritab[113+1] = {
+/*
+ * Index, Qe_Value, Next_Index_LPS, Next_Index_MPS, Switch_MPS
+ */
+  V(   0, 0x5a1d,   1,   1, 1 ),
+  V(   1, 0x2586,  14,   2, 0 ),
+  V(   2, 0x1114,  16,   3, 0 ),
+  V(   3, 0x080b,  18,   4, 0 ),
+  V(   4, 0x03d8,  20,   5, 0 ),
+  V(   5, 0x01da,  23,   6, 0 ),
+  V(   6, 0x00e5,  25,   7, 0 ),
+  V(   7, 0x006f,  28,   8, 0 ),
+  V(   8, 0x0036,  30,   9, 0 ),
+  V(   9, 0x001a,  33,  10, 0 ),
+  V(  10, 0x000d,  35,  11, 0 ),
+  V(  11, 0x0006,   9,  12, 0 ),
+  V(  12, 0x0003,  10,  13, 0 ),
+  V(  13, 0x0001,  12,  13, 0 ),
+  V(  14, 0x5a7f,  15,  15, 1 ),
+  V(  15, 0x3f25,  36,  16, 0 ),
+  V(  16, 0x2cf2,  38,  17, 0 ),
+  V(  17, 0x207c,  39,  18, 0 ),
+  V(  18, 0x17b9,  40,  19, 0 ),
+  V(  19, 0x1182,  42,  20, 0 ),
+  V(  20, 0x0cef,  43,  21, 0 ),
+  V(  21, 0x09a1,  45,  22, 0 ),
+  V(  22, 0x072f,  46,  23, 0 ),
+  V(  23, 0x055c,  48,  24, 0 ),
+  V(  24, 0x0406,  49,  25, 0 ),
+  V(  25, 0x0303,  51,  26, 0 ),
+  V(  26, 0x0240,  52,  27, 0 ),
+  V(  27, 0x01b1,  54,  28, 0 ),
+  V(  28, 0x0144,  56,  29, 0 ),
+  V(  29, 0x00f5,  57,  30, 0 ),
+  V(  30, 0x00b7,  59,  31, 0 ),
+  V(  31, 0x008a,  60,  32, 0 ),
+  V(  32, 0x0068,  62,  33, 0 ),
+  V(  33, 0x004e,  63,  34, 0 ),
+  V(  34, 0x003b,  32,  35, 0 ),
+  V(  35, 0x002c,  33,   9, 0 ),
+  V(  36, 0x5ae1,  37,  37, 1 ),
+  V(  37, 0x484c,  64,  38, 0 ),
+  V(  38, 0x3a0d,  65,  39, 0 ),
+  V(  39, 0x2ef1,  67,  40, 0 ),
+  V(  40, 0x261f,  68,  41, 0 ),
+  V(  41, 0x1f33,  69,  42, 0 ),
+  V(  42, 0x19a8,  70,  43, 0 ),
+  V(  43, 0x1518,  72,  44, 0 ),
+  V(  44, 0x1177,  73,  45, 0 ),
+  V(  45, 0x0e74,  74,  46, 0 ),
+  V(  46, 0x0bfb,  75,  47, 0 ),
+  V(  47, 0x09f8,  77,  48, 0 ),
+  V(  48, 0x0861,  78,  49, 0 ),
+  V(  49, 0x0706,  79,  50, 0 ),
+  V(  50, 0x05cd,  48,  51, 0 ),
+  V(  51, 0x04de,  50,  52, 0 ),
+  V(  52, 0x040f,  50,  53, 0 ),
+  V(  53, 0x0363,  51,  54, 0 ),
+  V(  54, 0x02d4,  52,  55, 0 ),
+  V(  55, 0x025c,  53,  56, 0 ),
+  V(  56, 0x01f8,  54,  57, 0 ),
+  V(  57, 0x01a4,  55,  58, 0 ),
+  V(  58, 0x0160,  56,  59, 0 ),
+  V(  59, 0x0125,  57,  60, 0 ),
+  V(  60, 0x00f6,  58,  61, 0 ),
+  V(  61, 0x00cb,  59,  62, 0 ),
+  V(  62, 0x00ab,  61,  63, 0 ),
+  V(  63, 0x008f,  61,  32, 0 ),
+  V(  64, 0x5b12,  65,  65, 1 ),
+  V(  65, 0x4d04,  80,  66, 0 ),
+  V(  66, 0x412c,  81,  67, 0 ),
+  V(  67, 0x37d8,  82,  68, 0 ),
+  V(  68, 0x2fe8,  83,  69, 0 ),
+  V(  69, 0x293c,  84,  70, 0 ),
+  V(  70, 0x2379,  86,  71, 0 ),
+  V(  71, 0x1edf,  87,  72, 0 ),
+  V(  72, 0x1aa9,  87,  73, 0 ),
+  V(  73, 0x174e,  72,  74, 0 ),
+  V(  74, 0x1424,  72,  75, 0 ),
+  V(  75, 0x119c,  74,  76, 0 ),
+  V(  76, 0x0f6b,  74,  77, 0 ),
+  V(  77, 0x0d51,  75,  78, 0 ),
+  V(  78, 0x0bb6,  77,  79, 0 ),
+  V(  79, 0x0a40,  77,  48, 0 ),
+  V(  80, 0x5832,  80,  81, 1 ),
+  V(  81, 0x4d1c,  88,  82, 0 ),
+  V(  82, 0x438e,  89,  83, 0 ),
+  V(  83, 0x3bdd,  90,  84, 0 ),
+  V(  84, 0x34ee,  91,  85, 0 ),
+  V(  85, 0x2eae,  92,  86, 0 ),
+  V(  86, 0x299a,  93,  87, 0 ),
+  V(  87, 0x2516,  86,  71, 0 ),
+  V(  88, 0x5570,  88,  89, 1 ),
+  V(  89, 0x4ca9,  95,  90, 0 ),
+  V(  90, 0x44d9,  96,  91, 0 ),
+  V(  91, 0x3e22,  97,  92, 0 ),
+  V(  92, 0x3824,  99,  93, 0 ),
+  V(  93, 0x32b4,  99,  94, 0 ),
+  V(  94, 0x2e17,  93,  86, 0 ),
+  V(  95, 0x56a8,  95,  96, 1 ),
+  V(  96, 0x4f46, 101,  97, 0 ),
+  V(  97, 0x47e5, 102,  98, 0 ),
+  V(  98, 0x41cf, 103,  99, 0 ),
+  V(  99, 0x3c3d, 104, 100, 0 ),
+  V( 100, 0x375e,  99,  93, 0 ),
+  V( 101, 0x5231, 105, 102, 0 ),
+  V( 102, 0x4c0f, 106, 103, 0 ),
+  V( 103, 0x4639, 107, 104, 0 ),
+  V( 104, 0x415e, 103,  99, 0 ),
+  V( 105, 0x5627, 105, 106, 1 ),
+  V( 106, 0x50e7, 108, 107, 0 ),
+  V( 107, 0x4b85, 109, 103, 0 ),
+  V( 108, 0x5597, 110, 109, 0 ),
+  V( 109, 0x504f, 111, 107, 0 ),
+  V( 110, 0x5a10, 110, 111, 1 ),
+  V( 111, 0x5522, 112, 109, 0 ),
+  V( 112, 0x59eb, 112, 111, 1 ),
+/*
+ * This last entry is used for fixed probability estimate of 0.5
+ * as recommended in Section 10.3 Table 5 of ITU-T Rec. T.851.
+ */
+  V( 113, 0x5a1d, 113, 113, 0 )
+};
diff --git a/src/libjpeg-turbo/jcapimin.c b/src/libjpeg-turbo/jcapimin.c
new file mode 100644
index 0000000..20ba9e9
--- /dev/null
+++ b/src/libjpeg-turbo/jcapimin.c
@@ -0,0 +1,292 @@
+/*
+ * jcapimin.c
+ *
+ * Copyright (C) 1994-1998, Thomas G. Lane.
+ * Modified 2003-2010 by Guido Vollbeding.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains application interface code for the compression half
+ * of the JPEG library.  These are the "minimum" API routines that may be
+ * needed in either the normal full-compression case or the transcoding-only
+ * case.
+ *
+ * Most of the routines intended to be called directly by an application
+ * are in this file or in jcapistd.c.  But also see jcparam.c for
+ * parameter-setup helper routines, jcomapi.c for routines shared by
+ * compression and decompression, and jctrans.c for the transcoding case.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+
+
+/*
+ * Initialization of a JPEG compression object.
+ * The error manager must already be set up (in case memory manager fails).
+ */
+
+GLOBAL(void)
+jpeg_CreateCompress (j_compress_ptr cinfo, int version, size_t structsize)
+{
+  int i;
+
+  /* Guard against version mismatches between library and caller. */
+  cinfo->mem = NULL;		/* so jpeg_destroy knows mem mgr not called */
+  if (version != JPEG_LIB_VERSION)
+    ERREXIT2(cinfo, JERR_BAD_LIB_VERSION, JPEG_LIB_VERSION, version);
+  if (structsize != SIZEOF(struct jpeg_compress_struct))
+    ERREXIT2(cinfo, JERR_BAD_STRUCT_SIZE, 
+	     (int) SIZEOF(struct jpeg_compress_struct), (int) structsize);
+
+  /* For debugging purposes, we zero the whole master structure.
+   * But the application has already set the err pointer, and may have set
+   * client_data, so we have to save and restore those fields.
+   * Note: if application hasn't set client_data, tools like Purify may
+   * complain here.
+   */
+  {
+    struct jpeg_error_mgr * err = cinfo->err;
+    void * client_data = cinfo->client_data; /* ignore Purify complaint here */
+    MEMZERO(cinfo, SIZEOF(struct jpeg_compress_struct));
+    cinfo->err = err;
+    cinfo->client_data = client_data;
+  }
+  cinfo->is_decompressor = FALSE;
+
+  /* Initialize a memory manager instance for this object */
+  jinit_memory_mgr((j_common_ptr) cinfo);
+
+  /* Zero out pointers to permanent structures. */
+  cinfo->progress = NULL;
+  cinfo->dest = NULL;
+
+  cinfo->comp_info = NULL;
+
+  for (i = 0; i < NUM_QUANT_TBLS; i++) {
+    cinfo->quant_tbl_ptrs[i] = NULL;
+#if JPEG_LIB_VERSION >= 70
+    cinfo->q_scale_factor[i] = 100;
+#endif
+  }
+
+  for (i = 0; i < NUM_HUFF_TBLS; i++) {
+    cinfo->dc_huff_tbl_ptrs[i] = NULL;
+    cinfo->ac_huff_tbl_ptrs[i] = NULL;
+  }
+
+#if JPEG_LIB_VERSION >= 80
+  /* Must do it here for emit_dqt in case jpeg_write_tables is used */
+  cinfo->block_size = DCTSIZE;
+  cinfo->natural_order = jpeg_natural_order;
+  cinfo->lim_Se = DCTSIZE2-1;
+#endif
+
+  cinfo->script_space = NULL;
+
+  cinfo->input_gamma = 1.0;	/* in case application forgets */
+
+  /* OK, I'm ready */
+  cinfo->global_state = CSTATE_START;
+}
+
+
+/*
+ * Destruction of a JPEG compression object
+ */
+
+GLOBAL(void)
+jpeg_destroy_compress (j_compress_ptr cinfo)
+{
+  jpeg_destroy((j_common_ptr) cinfo); /* use common routine */
+}
+
+
+/*
+ * Abort processing of a JPEG compression operation,
+ * but don't destroy the object itself.
+ */
+
+GLOBAL(void)
+jpeg_abort_compress (j_compress_ptr cinfo)
+{
+  jpeg_abort((j_common_ptr) cinfo); /* use common routine */
+}
+
+
+/*
+ * Forcibly suppress or un-suppress all quantization and Huffman tables.
+ * Marks all currently defined tables as already written (if suppress)
+ * or not written (if !suppress).  This will control whether they get emitted
+ * by a subsequent jpeg_start_compress call.
+ *
+ * This routine is exported for use by applications that want to produce
+ * abbreviated JPEG datastreams.  It logically belongs in jcparam.c, but
+ * since it is called by jpeg_start_compress, we put it here --- otherwise
+ * jcparam.o would be linked whether the application used it or not.
+ */
+
+GLOBAL(void)
+jpeg_suppress_tables (j_compress_ptr cinfo, boolean suppress)
+{
+  int i;
+  JQUANT_TBL * qtbl;
+  JHUFF_TBL * htbl;
+
+  for (i = 0; i < NUM_QUANT_TBLS; i++) {
+    if ((qtbl = cinfo->quant_tbl_ptrs[i]) != NULL)
+      qtbl->sent_table = suppress;
+  }
+
+  for (i = 0; i < NUM_HUFF_TBLS; i++) {
+    if ((htbl = cinfo->dc_huff_tbl_ptrs[i]) != NULL)
+      htbl->sent_table = suppress;
+    if ((htbl = cinfo->ac_huff_tbl_ptrs[i]) != NULL)
+      htbl->sent_table = suppress;
+  }
+}
+
+
+/*
+ * Finish JPEG compression.
+ *
+ * If a multipass operating mode was selected, this may do a great deal of
+ * work including most of the actual output.
+ */
+
+GLOBAL(void)
+jpeg_finish_compress (j_compress_ptr cinfo)
+{
+  JDIMENSION iMCU_row;
+
+  if (cinfo->global_state == CSTATE_SCANNING ||
+      cinfo->global_state == CSTATE_RAW_OK) {
+    /* Terminate first pass */
+    if (cinfo->next_scanline < cinfo->image_height)
+      ERREXIT(cinfo, JERR_TOO_LITTLE_DATA);
+    (*cinfo->master->finish_pass) (cinfo);
+  } else if (cinfo->global_state != CSTATE_WRCOEFS)
+    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
+  /* Perform any remaining passes */
+  while (! cinfo->master->is_last_pass) {
+    (*cinfo->master->prepare_for_pass) (cinfo);
+    for (iMCU_row = 0; iMCU_row < cinfo->total_iMCU_rows; iMCU_row++) {
+      if (cinfo->progress != NULL) {
+	cinfo->progress->pass_counter = (long) iMCU_row;
+	cinfo->progress->pass_limit = (long) cinfo->total_iMCU_rows;
+	(*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
+      }
+      /* We bypass the main controller and invoke coef controller directly;
+       * all work is being done from the coefficient buffer.
+       */
+      if (! (*cinfo->coef->compress_data) (cinfo, (JSAMPIMAGE) NULL))
+	ERREXIT(cinfo, JERR_CANT_SUSPEND);
+    }
+    (*cinfo->master->finish_pass) (cinfo);
+  }
+  /* Write EOI, do final cleanup */
+  (*cinfo->marker->write_file_trailer) (cinfo);
+  (*cinfo->dest->term_destination) (cinfo);
+  /* We can use jpeg_abort to release memory and reset global_state */
+  jpeg_abort((j_common_ptr) cinfo);
+}
+
+
+/*
+ * Write a special marker.
+ * This is only recommended for writing COM or APPn markers.
+ * Must be called after jpeg_start_compress() and before
+ * first call to jpeg_write_scanlines() or jpeg_write_raw_data().
+ */
+
+GLOBAL(void)
+jpeg_write_marker (j_compress_ptr cinfo, int marker,
+		   const JOCTET *dataptr, unsigned int datalen)
+{
+  JMETHOD(void, write_marker_byte, (j_compress_ptr info, int val));
+
+  if (cinfo->next_scanline != 0 ||
+      (cinfo->global_state != CSTATE_SCANNING &&
+       cinfo->global_state != CSTATE_RAW_OK &&
+       cinfo->global_state != CSTATE_WRCOEFS))
+    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
+
+  (*cinfo->marker->write_marker_header) (cinfo, marker, datalen);
+  write_marker_byte = cinfo->marker->write_marker_byte;	/* copy for speed */
+  while (datalen--) {
+    (*write_marker_byte) (cinfo, *dataptr);
+    dataptr++;
+  }
+}
+
+/* Same, but piecemeal. */
+
+GLOBAL(void)
+jpeg_write_m_header (j_compress_ptr cinfo, int marker, unsigned int datalen)
+{
+  if (cinfo->next_scanline != 0 ||
+      (cinfo->global_state != CSTATE_SCANNING &&
+       cinfo->global_state != CSTATE_RAW_OK &&
+       cinfo->global_state != CSTATE_WRCOEFS))
+    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
+
+  (*cinfo->marker->write_marker_header) (cinfo, marker, datalen);
+}
+
+GLOBAL(void)
+jpeg_write_m_byte (j_compress_ptr cinfo, int val)
+{
+  (*cinfo->marker->write_marker_byte) (cinfo, val);
+}
+
+
+/*
+ * Alternate compression function: just write an abbreviated table file.
+ * Before calling this, all parameters and a data destination must be set up.
+ *
+ * To produce a pair of files containing abbreviated tables and abbreviated
+ * image data, one would proceed as follows:
+ *
+ *		initialize JPEG object
+ *		set JPEG parameters
+ *		set destination to table file
+ *		jpeg_write_tables(cinfo);
+ *		set destination to image file
+ *		jpeg_start_compress(cinfo, FALSE);
+ *		write data...
+ *		jpeg_finish_compress(cinfo);
+ *
+ * jpeg_write_tables has the side effect of marking all tables written
+ * (same as jpeg_suppress_tables(..., TRUE)).  Thus a subsequent start_compress
+ * will not re-emit the tables unless it is passed write_all_tables=TRUE.
+ */
+
+GLOBAL(void)
+jpeg_write_tables (j_compress_ptr cinfo)
+{
+  if (cinfo->global_state != CSTATE_START)
+    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
+
+  /* (Re)initialize error mgr and destination modules */
+  (*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo);
+  (*cinfo->dest->init_destination) (cinfo);
+  /* Initialize the marker writer ... bit of a crock to do it here. */
+  jinit_marker_writer(cinfo);
+  /* Write them tables! */
+  (*cinfo->marker->write_tables_only) (cinfo);
+  /* And clean up. */
+  (*cinfo->dest->term_destination) (cinfo);
+  /*
+   * In library releases up through v6a, we called jpeg_abort() here to free
+   * any working memory allocated by the destination manager and marker
+   * writer.  Some applications had a problem with that: they allocated space
+   * of their own from the library memory manager, and didn't want it to go
+   * away during write_tables.  So now we do nothing.  This will cause a
+   * memory leak if an app calls write_tables repeatedly without doing a full
+   * compression cycle or otherwise resetting the JPEG object.  However, that
+   * seems less bad than unexpectedly freeing memory in the normal case.
+   * An app that prefers the old behavior can call jpeg_abort for itself after
+   * each call to jpeg_write_tables().
+   */
+}
diff --git a/src/libjpeg-turbo/jcapistd.c b/src/libjpeg-turbo/jcapistd.c
new file mode 100644
index 0000000..c0320b1
--- /dev/null
+++ b/src/libjpeg-turbo/jcapistd.c
@@ -0,0 +1,161 @@
+/*
+ * jcapistd.c
+ *
+ * Copyright (C) 1994-1996, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains application interface code for the compression half
+ * of the JPEG library.  These are the "standard" API routines that are
+ * used in the normal full-compression case.  They are not used by a
+ * transcoding-only application.  Note that if an application links in
+ * jpeg_start_compress, it will end up linking in the entire compressor.
+ * We thus must separate this file from jcapimin.c to avoid linking the
+ * whole compression library into a transcoder.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+
+
+/*
+ * Compression initialization.
+ * Before calling this, all parameters and a data destination must be set up.
+ *
+ * We require a write_all_tables parameter as a failsafe check when writing
+ * multiple datastreams from the same compression object.  Since prior runs
+ * will have left all the tables marked sent_table=TRUE, a subsequent run
+ * would emit an abbreviated stream (no tables) by default.  This may be what
+ * is wanted, but for safety's sake it should not be the default behavior:
+ * programmers should have to make a deliberate choice to emit abbreviated
+ * images.  Therefore the documentation and examples should encourage people
+ * to pass write_all_tables=TRUE; then it will take active thought to do the
+ * wrong thing.
+ */
+
+GLOBAL(void)
+jpeg_start_compress (j_compress_ptr cinfo, boolean write_all_tables)
+{
+  if (cinfo->global_state != CSTATE_START)
+    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
+
+  if (write_all_tables)
+    jpeg_suppress_tables(cinfo, FALSE);	/* mark all tables to be written */
+
+  /* (Re)initialize error mgr and destination modules */
+  (*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo);
+  (*cinfo->dest->init_destination) (cinfo);
+  /* Perform master selection of active modules */
+  jinit_compress_master(cinfo);
+  /* Set up for the first pass */
+  (*cinfo->master->prepare_for_pass) (cinfo);
+  /* Ready for application to drive first pass through jpeg_write_scanlines
+   * or jpeg_write_raw_data.
+   */
+  cinfo->next_scanline = 0;
+  cinfo->global_state = (cinfo->raw_data_in ? CSTATE_RAW_OK : CSTATE_SCANNING);
+}
+
+
+/*
+ * Write some scanlines of data to the JPEG compressor.
+ *
+ * The return value will be the number of lines actually written.
+ * This should be less than the supplied num_lines only in case that
+ * the data destination module has requested suspension of the compressor,
+ * or if more than image_height scanlines are passed in.
+ *
+ * Note: we warn about excess calls to jpeg_write_scanlines() since
+ * this likely signals an application programmer error.  However,
+ * excess scanlines passed in the last valid call are *silently* ignored,
+ * so that the application need not adjust num_lines for end-of-image
+ * when using a multiple-scanline buffer.
+ */
+
+GLOBAL(JDIMENSION)
+jpeg_write_scanlines (j_compress_ptr cinfo, JSAMPARRAY scanlines,
+		      JDIMENSION num_lines)
+{
+  JDIMENSION row_ctr, rows_left;
+
+  if (cinfo->global_state != CSTATE_SCANNING)
+    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
+  if (cinfo->next_scanline >= cinfo->image_height)
+    WARNMS(cinfo, JWRN_TOO_MUCH_DATA);
+
+  /* Call progress monitor hook if present */
+  if (cinfo->progress != NULL) {
+    cinfo->progress->pass_counter = (long) cinfo->next_scanline;
+    cinfo->progress->pass_limit = (long) cinfo->image_height;
+    (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
+  }
+
+  /* Give master control module another chance if this is first call to
+   * jpeg_write_scanlines.  This lets output of the frame/scan headers be
+   * delayed so that application can write COM, etc, markers between
+   * jpeg_start_compress and jpeg_write_scanlines.
+   */
+  if (cinfo->master->call_pass_startup)
+    (*cinfo->master->pass_startup) (cinfo);
+
+  /* Ignore any extra scanlines at bottom of image. */
+  rows_left = cinfo->image_height - cinfo->next_scanline;
+  if (num_lines > rows_left)
+    num_lines = rows_left;
+
+  row_ctr = 0;
+  (*cinfo->main->process_data) (cinfo, scanlines, &row_ctr, num_lines);
+  cinfo->next_scanline += row_ctr;
+  return row_ctr;
+}
+
+
+/*
+ * Alternate entry point to write raw data.
+ * Processes exactly one iMCU row per call, unless suspended.
+ */
+
+GLOBAL(JDIMENSION)
+jpeg_write_raw_data (j_compress_ptr cinfo, JSAMPIMAGE data,
+		     JDIMENSION num_lines)
+{
+  JDIMENSION lines_per_iMCU_row;
+
+  if (cinfo->global_state != CSTATE_RAW_OK)
+    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
+  if (cinfo->next_scanline >= cinfo->image_height) {
+    WARNMS(cinfo, JWRN_TOO_MUCH_DATA);
+    return 0;
+  }
+
+  /* Call progress monitor hook if present */
+  if (cinfo->progress != NULL) {
+    cinfo->progress->pass_counter = (long) cinfo->next_scanline;
+    cinfo->progress->pass_limit = (long) cinfo->image_height;
+    (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
+  }
+
+  /* Give master control module another chance if this is first call to
+   * jpeg_write_raw_data.  This lets output of the frame/scan headers be
+   * delayed so that application can write COM, etc, markers between
+   * jpeg_start_compress and jpeg_write_raw_data.
+   */
+  if (cinfo->master->call_pass_startup)
+    (*cinfo->master->pass_startup) (cinfo);
+
+  /* Verify that at least one iMCU row has been passed. */
+  lines_per_iMCU_row = cinfo->max_v_samp_factor * DCTSIZE;
+  if (num_lines < lines_per_iMCU_row)
+    ERREXIT(cinfo, JERR_BUFFER_SIZE);
+
+  /* Directly compress the row. */
+  if (! (*cinfo->coef->compress_data) (cinfo, data)) {
+    /* If compressor did not consume the whole row, suspend processing. */
+    return 0;
+  }
+
+  /* OK, we processed one iMCU row. */
+  cinfo->next_scanline += lines_per_iMCU_row;
+  return lines_per_iMCU_row;
+}
diff --git a/src/libjpeg-turbo/jcarith.c b/src/libjpeg-turbo/jcarith.c
new file mode 100644
index 0000000..a9ca1c3
--- /dev/null
+++ b/src/libjpeg-turbo/jcarith.c
@@ -0,0 +1,925 @@
+/*
+ * jcarith.c
+ *
+ * Developed 1997-2009 by Guido Vollbeding.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains portable arithmetic entropy encoding routines for JPEG
+ * (implementing the ISO/IEC IS 10918-1 and CCITT Recommendation ITU-T T.81).
+ *
+ * Both sequential and progressive modes are supported in this single module.
+ *
+ * Suspension is not currently supported in this module.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+
+
+/* Expanded entropy encoder object for arithmetic encoding. */
+
+typedef struct {
+  struct jpeg_entropy_encoder pub; /* public fields */
+
+  INT32 c; /* C register, base of coding interval, layout as in sec. D.1.3 */
+  INT32 a;               /* A register, normalized size of coding interval */
+  INT32 sc;        /* counter for stacked 0xFF values which might overflow */
+  INT32 zc;          /* counter for pending 0x00 output values which might *
+                          * be discarded at the end ("Pacman" termination) */
+  int ct;  /* bit shift counter, determines when next byte will be written */
+  int buffer;                /* buffer for most recent output byte != 0xFF */
+
+  int last_dc_val[MAX_COMPS_IN_SCAN]; /* last DC coef for each component */
+  int dc_context[MAX_COMPS_IN_SCAN]; /* context index for DC conditioning */
+
+  unsigned int restarts_to_go;	/* MCUs left in this restart interval */
+  int next_restart_num;		/* next restart number to write (0-7) */
+
+  /* Pointers to statistics areas (these workspaces have image lifespan) */
+  unsigned char * dc_stats[NUM_ARITH_TBLS];
+  unsigned char * ac_stats[NUM_ARITH_TBLS];
+
+  /* Statistics bin for coding with fixed probability 0.5 */
+  unsigned char fixed_bin[4];
+} arith_entropy_encoder;
+
+typedef arith_entropy_encoder * arith_entropy_ptr;
+
+/* The following two definitions specify the allocation chunk size
+ * for the statistics area.
+ * According to sections F.1.4.4.1.3 and F.1.4.4.2, we need at least
+ * 49 statistics bins for DC, and 245 statistics bins for AC coding.
+ *
+ * We use a compact representation with 1 byte per statistics bin,
+ * thus the numbers directly represent byte sizes.
+ * This 1 byte per statistics bin contains the meaning of the MPS
+ * (more probable symbol) in the highest bit (mask 0x80), and the
+ * index into the probability estimation state machine table
+ * in the lower bits (mask 0x7F).
+ */
+
+#define DC_STAT_BINS 64
+#define AC_STAT_BINS 256
+
+/* NOTE: Uncomment the following #define if you want to use the
+ * given formula for calculating the AC conditioning parameter Kx
+ * for spectral selection progressive coding in section G.1.3.2
+ * of the spec (Kx = Kmin + SRL (8 + Se - Kmin) 4).
+ * Although the spec and P&M authors claim that this "has proven
+ * to give good results for 8 bit precision samples", I'm not
+ * convinced yet that this is really beneficial.
+ * Early tests gave only very marginal compression enhancements
+ * (a few - around 5 or so - bytes even for very large files),
+ * which would turn out rather negative if we'd suppress the
+ * DAC (Define Arithmetic Conditioning) marker segments for
+ * the default parameters in the future.
+ * Note that currently the marker writing module emits 12-byte
+ * DAC segments for a full-component scan in a color image.
+ * This is not worth worrying about IMHO. However, since the
+ * spec defines the default values to be used if the tables
+ * are omitted (unlike Huffman tables, which are required
+ * anyway), one might optimize this behaviour in the future,
+ * and then it would be disadvantageous to use custom tables if
+ * they don't provide sufficient gain to exceed the DAC size.
+ *
+ * On the other hand, I'd consider it as a reasonable result
+ * that the conditioning has no significant influence on the
+ * compression performance. This means that the basic
+ * statistical model is already rather stable.
+ *
+ * Thus, at the moment, we use the default conditioning values
+ * anyway, and do not use the custom formula.
+ *
+#define CALCULATE_SPECTRAL_CONDITIONING
+ */
+
+/* IRIGHT_SHIFT is like RIGHT_SHIFT, but works on int rather than INT32.
+ * We assume that int right shift is unsigned if INT32 right shift is,
+ * which should be safe.
+ */
+
+#ifdef RIGHT_SHIFT_IS_UNSIGNED
+#define ISHIFT_TEMPS	int ishift_temp;
+#define IRIGHT_SHIFT(x,shft)  \
+	((ishift_temp = (x)) < 0 ? \
+	 (ishift_temp >> (shft)) | ((~0) << (16-(shft))) : \
+	 (ishift_temp >> (shft)))
+#else
+#define ISHIFT_TEMPS
+#define IRIGHT_SHIFT(x,shft)	((x) >> (shft))
+#endif
+
+
+LOCAL(void)
+emit_byte (int val, j_compress_ptr cinfo)
+/* Write next output byte; we do not support suspension in this module. */
+{
+  struct jpeg_destination_mgr * dest = cinfo->dest;
+
+  *dest->next_output_byte++ = (JOCTET) val;
+  if (--dest->free_in_buffer == 0)
+    if (! (*dest->empty_output_buffer) (cinfo))
+      ERREXIT(cinfo, JERR_CANT_SUSPEND);
+}
+
+
+/*
+ * Finish up at the end of an arithmetic-compressed scan.
+ */
+
+METHODDEF(void)
+finish_pass (j_compress_ptr cinfo)
+{
+  arith_entropy_ptr e = (arith_entropy_ptr) cinfo->entropy;
+  INT32 temp;
+
+  /* Section D.1.8: Termination of encoding */
+
+  /* Find the e->c in the coding interval with the largest
+   * number of trailing zero bits */
+  if ((temp = (e->a - 1 + e->c) & 0xFFFF0000L) < e->c)
+    e->c = temp + 0x8000L;
+  else
+    e->c = temp;
+  /* Send remaining bytes to output */
+  e->c <<= e->ct;
+  if (e->c & 0xF8000000L) {
+    /* One final overflow has to be handled */
+    if (e->buffer >= 0) {
+      if (e->zc)
+	do emit_byte(0x00, cinfo);
+	while (--e->zc);
+      emit_byte(e->buffer + 1, cinfo);
+      if (e->buffer + 1 == 0xFF)
+	emit_byte(0x00, cinfo);
+    }
+    e->zc += e->sc;  /* carry-over converts stacked 0xFF bytes to 0x00 */
+    e->sc = 0;
+  } else {
+    if (e->buffer == 0)
+      ++e->zc;
+    else if (e->buffer >= 0) {
+      if (e->zc)
+	do emit_byte(0x00, cinfo);
+	while (--e->zc);
+      emit_byte(e->buffer, cinfo);
+    }
+    if (e->sc) {
+      if (e->zc)
+	do emit_byte(0x00, cinfo);
+	while (--e->zc);
+      do {
+	emit_byte(0xFF, cinfo);
+	emit_byte(0x00, cinfo);
+      } while (--e->sc);
+    }
+  }
+  /* Output final bytes only if they are not 0x00 */
+  if (e->c & 0x7FFF800L) {
+    if (e->zc)  /* output final pending zero bytes */
+      do emit_byte(0x00, cinfo);
+      while (--e->zc);
+    emit_byte((e->c >> 19) & 0xFF, cinfo);
+    if (((e->c >> 19) & 0xFF) == 0xFF)
+      emit_byte(0x00, cinfo);
+    if (e->c & 0x7F800L) {
+      emit_byte((e->c >> 11) & 0xFF, cinfo);
+      if (((e->c >> 11) & 0xFF) == 0xFF)
+	emit_byte(0x00, cinfo);
+    }
+  }
+}
+
+
+/*
+ * The core arithmetic encoding routine (common in JPEG and JBIG).
+ * This needs to go as fast as possible.
+ * Machine-dependent optimization facilities
+ * are not utilized in this portable implementation.
+ * However, this code should be fairly efficient and
+ * may be a good base for further optimizations anyway.
+ *
+ * Parameter 'val' to be encoded may be 0 or 1 (binary decision).
+ *
+ * Note: I've added full "Pacman" termination support to the
+ * byte output routines, which is equivalent to the optional
+ * Discard_final_zeros procedure (Figure D.15) in the spec.
+ * Thus, we always produce the shortest possible output
+ * stream compliant to the spec (no trailing zero bytes,
+ * except for FF stuffing).
+ *
+ * I've also introduced a new scheme for accessing
+ * the probability estimation state machine table,
+ * derived from Markus Kuhn's JBIG implementation.
+ */
+
+LOCAL(void)
+arith_encode (j_compress_ptr cinfo, unsigned char *st, int val) 
+{
+  register arith_entropy_ptr e = (arith_entropy_ptr) cinfo->entropy;
+  register unsigned char nl, nm;
+  register INT32 qe, temp;
+  register int sv;
+
+  /* Fetch values from our compact representation of Table D.2:
+   * Qe values and probability estimation state machine
+   */
+  sv = *st;
+  qe = jpeg_aritab[sv & 0x7F];	/* => Qe_Value */
+  nl = qe & 0xFF; qe >>= 8;	/* Next_Index_LPS + Switch_MPS */
+  nm = qe & 0xFF; qe >>= 8;	/* Next_Index_MPS */
+
+  /* Encode & estimation procedures per sections D.1.4 & D.1.5 */
+  e->a -= qe;
+  if (val != (sv >> 7)) {
+    /* Encode the less probable symbol */
+    if (e->a >= qe) {
+      /* If the interval size (qe) for the less probable symbol (LPS)
+       * is larger than the interval size for the MPS, then exchange
+       * the two symbols for coding efficiency, otherwise code the LPS
+       * as usual: */
+      e->c += e->a;
+      e->a = qe;
+    }
+    *st = (sv & 0x80) ^ nl;	/* Estimate_after_LPS */
+  } else {
+    /* Encode the more probable symbol */
+    if (e->a >= 0x8000L)
+      return;  /* A >= 0x8000 -> ready, no renormalization required */
+    if (e->a < qe) {
+      /* If the interval size (qe) for the less probable symbol (LPS)
+       * is larger than the interval size for the MPS, then exchange
+       * the two symbols for coding efficiency: */
+      e->c += e->a;
+      e->a = qe;
+    }
+    *st = (sv & 0x80) ^ nm;	/* Estimate_after_MPS */
+  }
+
+  /* Renormalization & data output per section D.1.6 */
+  do {
+    e->a <<= 1;
+    e->c <<= 1;
+    if (--e->ct == 0) {
+      /* Another byte is ready for output */
+      temp = e->c >> 19;
+      if (temp > 0xFF) {
+	/* Handle overflow over all stacked 0xFF bytes */
+	if (e->buffer >= 0) {
+	  if (e->zc)
+	    do emit_byte(0x00, cinfo);
+	    while (--e->zc);
+	  emit_byte(e->buffer + 1, cinfo);
+	  if (e->buffer + 1 == 0xFF)
+	    emit_byte(0x00, cinfo);
+	}
+	e->zc += e->sc;  /* carry-over converts stacked 0xFF bytes to 0x00 */
+	e->sc = 0;
+	/* Note: The 3 spacer bits in the C register guarantee
+	 * that the new buffer byte can't be 0xFF here
+	 * (see page 160 in the P&M JPEG book). */
+	e->buffer = temp & 0xFF;  /* new output byte, might overflow later */
+      } else if (temp == 0xFF) {
+	++e->sc;  /* stack 0xFF byte (which might overflow later) */
+      } else {
+	/* Output all stacked 0xFF bytes, they will not overflow any more */
+	if (e->buffer == 0)
+	  ++e->zc;
+	else if (e->buffer >= 0) {
+	  if (e->zc)
+	    do emit_byte(0x00, cinfo);
+	    while (--e->zc);
+	  emit_byte(e->buffer, cinfo);
+	}
+	if (e->sc) {
+	  if (e->zc)
+	    do emit_byte(0x00, cinfo);
+	    while (--e->zc);
+	  do {
+	    emit_byte(0xFF, cinfo);
+	    emit_byte(0x00, cinfo);
+	  } while (--e->sc);
+	}
+	e->buffer = temp & 0xFF;  /* new output byte (can still overflow) */
+      }
+      e->c &= 0x7FFFFL;
+      e->ct += 8;
+    }
+  } while (e->a < 0x8000L);
+}
+
+
+/*
+ * Emit a restart marker & resynchronize predictions.
+ */
+
+LOCAL(void)
+emit_restart (j_compress_ptr cinfo, int restart_num)
+{
+  arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
+  int ci;
+  jpeg_component_info * compptr;
+
+  finish_pass(cinfo);
+
+  emit_byte(0xFF, cinfo);
+  emit_byte(JPEG_RST0 + restart_num, cinfo);
+
+  /* Re-initialize statistics areas */
+  for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
+    compptr = cinfo->cur_comp_info[ci];
+    /* DC needs no table for refinement scan */
+    if (cinfo->progressive_mode == 0 || (cinfo->Ss == 0 && cinfo->Ah == 0)) {
+      MEMZERO(entropy->dc_stats[compptr->dc_tbl_no], DC_STAT_BINS);
+      /* Reset DC predictions to 0 */
+      entropy->last_dc_val[ci] = 0;
+      entropy->dc_context[ci] = 0;
+    }
+    /* AC needs no table when not present */
+    if (cinfo->progressive_mode == 0 || cinfo->Se) {
+      MEMZERO(entropy->ac_stats[compptr->ac_tbl_no], AC_STAT_BINS);
+    }
+  }
+
+  /* Reset arithmetic encoding variables */
+  entropy->c = 0;
+  entropy->a = 0x10000L;
+  entropy->sc = 0;
+  entropy->zc = 0;
+  entropy->ct = 11;
+  entropy->buffer = -1;  /* empty */
+}
+
+
+/*
+ * MCU encoding for DC initial scan (either spectral selection,
+ * or first pass of successive approximation).
+ */
+
+METHODDEF(boolean)
+encode_mcu_DC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
+{
+  arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
+  JBLOCKROW block;
+  unsigned char *st;
+  int blkn, ci, tbl;
+  int v, v2, m;
+  ISHIFT_TEMPS
+
+  /* Emit restart marker if needed */
+  if (cinfo->restart_interval) {
+    if (entropy->restarts_to_go == 0) {
+      emit_restart(cinfo, entropy->next_restart_num);
+      entropy->restarts_to_go = cinfo->restart_interval;
+      entropy->next_restart_num++;
+      entropy->next_restart_num &= 7;
+    }
+    entropy->restarts_to_go--;
+  }
+
+  /* Encode the MCU data blocks */
+  for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
+    block = MCU_data[blkn];
+    ci = cinfo->MCU_membership[blkn];
+    tbl = cinfo->cur_comp_info[ci]->dc_tbl_no;
+
+    /* Compute the DC value after the required point transform by Al.
+     * This is simply an arithmetic right shift.
+     */
+    m = IRIGHT_SHIFT((int) ((*block)[0]), cinfo->Al);
+
+    /* Sections F.1.4.1 & F.1.4.4.1: Encoding of DC coefficients */
+
+    /* Table F.4: Point to statistics bin S0 for DC coefficient coding */
+    st = entropy->dc_stats[tbl] + entropy->dc_context[ci];
+
+    /* Figure F.4: Encode_DC_DIFF */
+    if ((v = m - entropy->last_dc_val[ci]) == 0) {
+      arith_encode(cinfo, st, 0);
+      entropy->dc_context[ci] = 0;	/* zero diff category */
+    } else {
+      entropy->last_dc_val[ci] = m;
+      arith_encode(cinfo, st, 1);
+      /* Figure F.6: Encoding nonzero value v */
+      /* Figure F.7: Encoding the sign of v */
+      if (v > 0) {
+	arith_encode(cinfo, st + 1, 0);	/* Table F.4: SS = S0 + 1 */
+	st += 2;			/* Table F.4: SP = S0 + 2 */
+	entropy->dc_context[ci] = 4;	/* small positive diff category */
+      } else {
+	v = -v;
+	arith_encode(cinfo, st + 1, 1);	/* Table F.4: SS = S0 + 1 */
+	st += 3;			/* Table F.4: SN = S0 + 3 */
+	entropy->dc_context[ci] = 8;	/* small negative diff category */
+      }
+      /* Figure F.8: Encoding the magnitude category of v */
+      m = 0;
+      if (v -= 1) {
+	arith_encode(cinfo, st, 1);
+	m = 1;
+	v2 = v;
+	st = entropy->dc_stats[tbl] + 20; /* Table F.4: X1 = 20 */
+	while (v2 >>= 1) {
+	  arith_encode(cinfo, st, 1);
+	  m <<= 1;
+	  st += 1;
+	}
+      }
+      arith_encode(cinfo, st, 0);
+      /* Section F.1.4.4.1.2: Establish dc_context conditioning category */
+      if (m < (int) ((1L << cinfo->arith_dc_L[tbl]) >> 1))
+	entropy->dc_context[ci] = 0;	/* zero diff category */
+      else if (m > (int) ((1L << cinfo->arith_dc_U[tbl]) >> 1))
+	entropy->dc_context[ci] += 8;	/* large diff category */
+      /* Figure F.9: Encoding the magnitude bit pattern of v */
+      st += 14;
+      while (m >>= 1)
+	arith_encode(cinfo, st, (m & v) ? 1 : 0);
+    }
+  }
+
+  return TRUE;
+}
+
+
+/*
+ * MCU encoding for AC initial scan (either spectral selection,
+ * or first pass of successive approximation).
+ */
+
+METHODDEF(boolean)
+encode_mcu_AC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
+{
+  arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
+  JBLOCKROW block;
+  unsigned char *st;
+  int tbl, k, ke;
+  int v, v2, m;
+
+  /* Emit restart marker if needed */
+  if (cinfo->restart_interval) {
+    if (entropy->restarts_to_go == 0) {
+      emit_restart(cinfo, entropy->next_restart_num);
+      entropy->restarts_to_go = cinfo->restart_interval;
+      entropy->next_restart_num++;
+      entropy->next_restart_num &= 7;
+    }
+    entropy->restarts_to_go--;
+  }
+
+  /* Encode the MCU data block */
+  block = MCU_data[0];
+  tbl = cinfo->cur_comp_info[0]->ac_tbl_no;
+
+  /* Sections F.1.4.2 & F.1.4.4.2: Encoding of AC coefficients */
+
+  /* Establish EOB (end-of-block) index */
+  for (ke = cinfo->Se; ke > 0; ke--)
+    /* We must apply the point transform by Al.  For AC coefficients this
+     * is an integer division with rounding towards 0.  To do this portably
+     * in C, we shift after obtaining the absolute value.
+     */
+    if ((v = (*block)[jpeg_natural_order[ke]]) >= 0) {
+      if (v >>= cinfo->Al) break;
+    } else {
+      v = -v;
+      if (v >>= cinfo->Al) break;
+    }
+
+  /* Figure F.5: Encode_AC_Coefficients */
+  for (k = cinfo->Ss; k <= ke; k++) {
+    st = entropy->ac_stats[tbl] + 3 * (k - 1);
+    arith_encode(cinfo, st, 0);		/* EOB decision */
+    for (;;) {
+      if ((v = (*block)[jpeg_natural_order[k]]) >= 0) {
+	if (v >>= cinfo->Al) {
+	  arith_encode(cinfo, st + 1, 1);
+	  arith_encode(cinfo, entropy->fixed_bin, 0);
+	  break;
+	}
+      } else {
+	v = -v;
+	if (v >>= cinfo->Al) {
+	  arith_encode(cinfo, st + 1, 1);
+	  arith_encode(cinfo, entropy->fixed_bin, 1);
+	  break;
+	}
+      }
+      arith_encode(cinfo, st + 1, 0); st += 3; k++;
+    }
+    st += 2;
+    /* Figure F.8: Encoding the magnitude category of v */
+    m = 0;
+    if (v -= 1) {
+      arith_encode(cinfo, st, 1);
+      m = 1;
+      v2 = v;
+      if (v2 >>= 1) {
+	arith_encode(cinfo, st, 1);
+	m <<= 1;
+	st = entropy->ac_stats[tbl] +
+	     (k <= cinfo->arith_ac_K[tbl] ? 189 : 217);
+	while (v2 >>= 1) {
+	  arith_encode(cinfo, st, 1);
+	  m <<= 1;
+	  st += 1;
+	}
+      }
+    }
+    arith_encode(cinfo, st, 0);
+    /* Figure F.9: Encoding the magnitude bit pattern of v */
+    st += 14;
+    while (m >>= 1)
+      arith_encode(cinfo, st, (m & v) ? 1 : 0);
+  }
+  /* Encode EOB decision only if k <= cinfo->Se */
+  if (k <= cinfo->Se) {
+    st = entropy->ac_stats[tbl] + 3 * (k - 1);
+    arith_encode(cinfo, st, 1);
+  }
+
+  return TRUE;
+}
+
+
+/*
+ * MCU encoding for DC successive approximation refinement scan.
+ */
+
+METHODDEF(boolean)
+encode_mcu_DC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
+{
+  arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
+  unsigned char *st;
+  int Al, blkn;
+
+  /* Emit restart marker if needed */
+  if (cinfo->restart_interval) {
+    if (entropy->restarts_to_go == 0) {
+      emit_restart(cinfo, entropy->next_restart_num);
+      entropy->restarts_to_go = cinfo->restart_interval;
+      entropy->next_restart_num++;
+      entropy->next_restart_num &= 7;
+    }
+    entropy->restarts_to_go--;
+  }
+
+  st = entropy->fixed_bin;	/* use fixed probability estimation */
+  Al = cinfo->Al;
+
+  /* Encode the MCU data blocks */
+  for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
+    /* We simply emit the Al'th bit of the DC coefficient value. */
+    arith_encode(cinfo, st, (MCU_data[blkn][0][0] >> Al) & 1);
+  }
+
+  return TRUE;
+}
+
+
+/*
+ * MCU encoding for AC successive approximation refinement scan.
+ */
+
+METHODDEF(boolean)
+encode_mcu_AC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
+{
+  arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
+  JBLOCKROW block;
+  unsigned char *st;
+  int tbl, k, ke, kex;
+  int v;
+
+  /* Emit restart marker if needed */
+  if (cinfo->restart_interval) {
+    if (entropy->restarts_to_go == 0) {
+      emit_restart(cinfo, entropy->next_restart_num);
+      entropy->restarts_to_go = cinfo->restart_interval;
+      entropy->next_restart_num++;
+      entropy->next_restart_num &= 7;
+    }
+    entropy->restarts_to_go--;
+  }
+
+  /* Encode the MCU data block */
+  block = MCU_data[0];
+  tbl = cinfo->cur_comp_info[0]->ac_tbl_no;
+
+  /* Section G.1.3.3: Encoding of AC coefficients */
+
+  /* Establish EOB (end-of-block) index */
+  for (ke = cinfo->Se; ke > 0; ke--)
+    /* We must apply the point transform by Al.  For AC coefficients this
+     * is an integer division with rounding towards 0.  To do this portably
+     * in C, we shift after obtaining the absolute value.
+     */
+    if ((v = (*block)[jpeg_natural_order[ke]]) >= 0) {
+      if (v >>= cinfo->Al) break;
+    } else {
+      v = -v;
+      if (v >>= cinfo->Al) break;
+    }
+
+  /* Establish EOBx (previous stage end-of-block) index */
+  for (kex = ke; kex > 0; kex--)
+    if ((v = (*block)[jpeg_natural_order[kex]]) >= 0) {
+      if (v >>= cinfo->Ah) break;
+    } else {
+      v = -v;
+      if (v >>= cinfo->Ah) break;
+    }
+
+  /* Figure G.10: Encode_AC_Coefficients_SA */
+  for (k = cinfo->Ss; k <= ke; k++) {
+    st = entropy->ac_stats[tbl] + 3 * (k - 1);
+    if (k > kex)
+      arith_encode(cinfo, st, 0);	/* EOB decision */
+    for (;;) {
+      if ((v = (*block)[jpeg_natural_order[k]]) >= 0) {
+	if (v >>= cinfo->Al) {
+	  if (v >> 1)			/* previously nonzero coef */
+	    arith_encode(cinfo, st + 2, (v & 1));
+	  else {			/* newly nonzero coef */
+	    arith_encode(cinfo, st + 1, 1);
+	    arith_encode(cinfo, entropy->fixed_bin, 0);
+	  }
+	  break;
+	}
+      } else {
+	v = -v;
+	if (v >>= cinfo->Al) {
+	  if (v >> 1)			/* previously nonzero coef */
+	    arith_encode(cinfo, st + 2, (v & 1));
+	  else {			/* newly nonzero coef */
+	    arith_encode(cinfo, st + 1, 1);
+	    arith_encode(cinfo, entropy->fixed_bin, 1);
+	  }
+	  break;
+	}
+      }
+      arith_encode(cinfo, st + 1, 0); st += 3; k++;
+    }
+  }
+  /* Encode EOB decision only if k <= cinfo->Se */
+  if (k <= cinfo->Se) {
+    st = entropy->ac_stats[tbl] + 3 * (k - 1);
+    arith_encode(cinfo, st, 1);
+  }
+
+  return TRUE;
+}
+
+
+/*
+ * Encode and output one MCU's worth of arithmetic-compressed coefficients.
+ */
+
+METHODDEF(boolean)
+encode_mcu (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
+{
+  arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
+  jpeg_component_info * compptr;
+  JBLOCKROW block;
+  unsigned char *st;
+  int blkn, ci, tbl, k, ke;
+  int v, v2, m;
+
+  /* Emit restart marker if needed */
+  if (cinfo->restart_interval) {
+    if (entropy->restarts_to_go == 0) {
+      emit_restart(cinfo, entropy->next_restart_num);
+      entropy->restarts_to_go = cinfo->restart_interval;
+      entropy->next_restart_num++;
+      entropy->next_restart_num &= 7;
+    }
+    entropy->restarts_to_go--;
+  }
+
+  /* Encode the MCU data blocks */
+  for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
+    block = MCU_data[blkn];
+    ci = cinfo->MCU_membership[blkn];
+    compptr = cinfo->cur_comp_info[ci];
+
+    /* Sections F.1.4.1 & F.1.4.4.1: Encoding of DC coefficients */
+
+    tbl = compptr->dc_tbl_no;
+
+    /* Table F.4: Point to statistics bin S0 for DC coefficient coding */
+    st = entropy->dc_stats[tbl] + entropy->dc_context[ci];
+
+    /* Figure F.4: Encode_DC_DIFF */
+    if ((v = (*block)[0] - entropy->last_dc_val[ci]) == 0) {
+      arith_encode(cinfo, st, 0);
+      entropy->dc_context[ci] = 0;	/* zero diff category */
+    } else {
+      entropy->last_dc_val[ci] = (*block)[0];
+      arith_encode(cinfo, st, 1);
+      /* Figure F.6: Encoding nonzero value v */
+      /* Figure F.7: Encoding the sign of v */
+      if (v > 0) {
+	arith_encode(cinfo, st + 1, 0);	/* Table F.4: SS = S0 + 1 */
+	st += 2;			/* Table F.4: SP = S0 + 2 */
+	entropy->dc_context[ci] = 4;	/* small positive diff category */
+      } else {
+	v = -v;
+	arith_encode(cinfo, st + 1, 1);	/* Table F.4: SS = S0 + 1 */
+	st += 3;			/* Table F.4: SN = S0 + 3 */
+	entropy->dc_context[ci] = 8;	/* small negative diff category */
+      }
+      /* Figure F.8: Encoding the magnitude category of v */
+      m = 0;
+      if (v -= 1) {
+	arith_encode(cinfo, st, 1);
+	m = 1;
+	v2 = v;
+	st = entropy->dc_stats[tbl] + 20; /* Table F.4: X1 = 20 */
+	while (v2 >>= 1) {
+	  arith_encode(cinfo, st, 1);
+	  m <<= 1;
+	  st += 1;
+	}
+      }
+      arith_encode(cinfo, st, 0);
+      /* Section F.1.4.4.1.2: Establish dc_context conditioning category */
+      if (m < (int) ((1L << cinfo->arith_dc_L[tbl]) >> 1))
+	entropy->dc_context[ci] = 0;	/* zero diff category */
+      else if (m > (int) ((1L << cinfo->arith_dc_U[tbl]) >> 1))
+	entropy->dc_context[ci] += 8;	/* large diff category */
+      /* Figure F.9: Encoding the magnitude bit pattern of v */
+      st += 14;
+      while (m >>= 1)
+	arith_encode(cinfo, st, (m & v) ? 1 : 0);
+    }
+
+    /* Sections F.1.4.2 & F.1.4.4.2: Encoding of AC coefficients */
+
+    tbl = compptr->ac_tbl_no;
+
+    /* Establish EOB (end-of-block) index */
+    for (ke = DCTSIZE2 - 1; ke > 0; ke--)
+      if ((*block)[jpeg_natural_order[ke]]) break;
+
+    /* Figure F.5: Encode_AC_Coefficients */
+    for (k = 1; k <= ke; k++) {
+      st = entropy->ac_stats[tbl] + 3 * (k - 1);
+      arith_encode(cinfo, st, 0);	/* EOB decision */
+      while ((v = (*block)[jpeg_natural_order[k]]) == 0) {
+	arith_encode(cinfo, st + 1, 0); st += 3; k++;
+      }
+      arith_encode(cinfo, st + 1, 1);
+      /* Figure F.6: Encoding nonzero value v */
+      /* Figure F.7: Encoding the sign of v */
+      if (v > 0) {
+	arith_encode(cinfo, entropy->fixed_bin, 0);
+      } else {
+	v = -v;
+	arith_encode(cinfo, entropy->fixed_bin, 1);
+      }
+      st += 2;
+      /* Figure F.8: Encoding the magnitude category of v */
+      m = 0;
+      if (v -= 1) {
+	arith_encode(cinfo, st, 1);
+	m = 1;
+	v2 = v;
+	if (v2 >>= 1) {
+	  arith_encode(cinfo, st, 1);
+	  m <<= 1;
+	  st = entropy->ac_stats[tbl] +
+	       (k <= cinfo->arith_ac_K[tbl] ? 189 : 217);
+	  while (v2 >>= 1) {
+	    arith_encode(cinfo, st, 1);
+	    m <<= 1;
+	    st += 1;
+	  }
+	}
+      }
+      arith_encode(cinfo, st, 0);
+      /* Figure F.9: Encoding the magnitude bit pattern of v */
+      st += 14;
+      while (m >>= 1)
+	arith_encode(cinfo, st, (m & v) ? 1 : 0);
+    }
+    /* Encode EOB decision only if k <= DCTSIZE2 - 1 */
+    if (k <= DCTSIZE2 - 1) {
+      st = entropy->ac_stats[tbl] + 3 * (k - 1);
+      arith_encode(cinfo, st, 1);
+    }
+  }
+
+  return TRUE;
+}
+
+
+/*
+ * Initialize for an arithmetic-compressed scan.
+ */
+
+METHODDEF(void)
+start_pass (j_compress_ptr cinfo, boolean gather_statistics)
+{
+  arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
+  int ci, tbl;
+  jpeg_component_info * compptr;
+
+  if (gather_statistics)
+    /* Make sure to avoid that in the master control logic!
+     * We are fully adaptive here and need no extra
+     * statistics gathering pass!
+     */
+    ERREXIT(cinfo, JERR_NOT_COMPILED);
+
+  /* We assume jcmaster.c already validated the progressive scan parameters. */
+
+  /* Select execution routines */
+  if (cinfo->progressive_mode) {
+    if (cinfo->Ah == 0) {
+      if (cinfo->Ss == 0)
+	entropy->pub.encode_mcu = encode_mcu_DC_first;
+      else
+	entropy->pub.encode_mcu = encode_mcu_AC_first;
+    } else {
+      if (cinfo->Ss == 0)
+	entropy->pub.encode_mcu = encode_mcu_DC_refine;
+      else
+	entropy->pub.encode_mcu = encode_mcu_AC_refine;
+    }
+  } else
+    entropy->pub.encode_mcu = encode_mcu;
+
+  /* Allocate & initialize requested statistics areas */
+  for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
+    compptr = cinfo->cur_comp_info[ci];
+    /* DC needs no table for refinement scan */
+    if (cinfo->progressive_mode == 0 || (cinfo->Ss == 0 && cinfo->Ah == 0)) {
+      tbl = compptr->dc_tbl_no;
+      if (tbl < 0 || tbl >= NUM_ARITH_TBLS)
+	ERREXIT1(cinfo, JERR_NO_ARITH_TABLE, tbl);
+      if (entropy->dc_stats[tbl] == NULL)
+	entropy->dc_stats[tbl] = (unsigned char *) (*cinfo->mem->alloc_small)
+	  ((j_common_ptr) cinfo, JPOOL_IMAGE, DC_STAT_BINS);
+      MEMZERO(entropy->dc_stats[tbl], DC_STAT_BINS);
+      /* Initialize DC predictions to 0 */
+      entropy->last_dc_val[ci] = 0;
+      entropy->dc_context[ci] = 0;
+    }
+    /* AC needs no table when not present */
+    if (cinfo->progressive_mode == 0 || cinfo->Se) {
+      tbl = compptr->ac_tbl_no;
+      if (tbl < 0 || tbl >= NUM_ARITH_TBLS)
+	ERREXIT1(cinfo, JERR_NO_ARITH_TABLE, tbl);
+      if (entropy->ac_stats[tbl] == NULL)
+	entropy->ac_stats[tbl] = (unsigned char *) (*cinfo->mem->alloc_small)
+	  ((j_common_ptr) cinfo, JPOOL_IMAGE, AC_STAT_BINS);
+      MEMZERO(entropy->ac_stats[tbl], AC_STAT_BINS);
+#ifdef CALCULATE_SPECTRAL_CONDITIONING
+      if (cinfo->progressive_mode)
+	/* Section G.1.3.2: Set appropriate arithmetic conditioning value Kx */
+	cinfo->arith_ac_K[tbl] = cinfo->Ss + ((8 + cinfo->Se - cinfo->Ss) >> 4);
+#endif
+    }
+  }
+
+  /* Initialize arithmetic encoding variables */
+  entropy->c = 0;
+  entropy->a = 0x10000L;
+  entropy->sc = 0;
+  entropy->zc = 0;
+  entropy->ct = 11;
+  entropy->buffer = -1;  /* empty */
+
+  /* Initialize restart stuff */
+  entropy->restarts_to_go = cinfo->restart_interval;
+  entropy->next_restart_num = 0;
+}
+
+
+/*
+ * Module initialization routine for arithmetic entropy encoding.
+ */
+
+GLOBAL(void)
+jinit_arith_encoder (j_compress_ptr cinfo)
+{
+  arith_entropy_ptr entropy;
+  int i;
+
+  entropy = (arith_entropy_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				SIZEOF(arith_entropy_encoder));
+  cinfo->entropy = (struct jpeg_entropy_encoder *) entropy;
+  entropy->pub.start_pass = start_pass;
+  entropy->pub.finish_pass = finish_pass;
+
+  /* Mark tables unallocated */
+  for (i = 0; i < NUM_ARITH_TBLS; i++) {
+    entropy->dc_stats[i] = NULL;
+    entropy->ac_stats[i] = NULL;
+  }
+
+  /* Initialize index for fixed probability estimation */
+  entropy->fixed_bin[0] = 113;
+}
diff --git a/src/libjpeg-turbo/jccoefct.c b/src/libjpeg-turbo/jccoefct.c
new file mode 100644
index 0000000..1963ddb
--- /dev/null
+++ b/src/libjpeg-turbo/jccoefct.c
@@ -0,0 +1,449 @@
+/*
+ * jccoefct.c
+ *
+ * Copyright (C) 1994-1997, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains the coefficient buffer controller for compression.
+ * This controller is the top level of the JPEG compressor proper.
+ * The coefficient buffer lies between forward-DCT and entropy encoding steps.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+
+
+/* We use a full-image coefficient buffer when doing Huffman optimization,
+ * and also for writing multiple-scan JPEG files.  In all cases, the DCT
+ * step is run during the first pass, and subsequent passes need only read
+ * the buffered coefficients.
+ */
+#ifdef ENTROPY_OPT_SUPPORTED
+#define FULL_COEF_BUFFER_SUPPORTED
+#else
+#ifdef C_MULTISCAN_FILES_SUPPORTED
+#define FULL_COEF_BUFFER_SUPPORTED
+#endif
+#endif
+
+
+/* Private buffer controller object */
+
+typedef struct {
+  struct jpeg_c_coef_controller pub; /* public fields */
+
+  JDIMENSION iMCU_row_num;	/* iMCU row # within image */
+  JDIMENSION mcu_ctr;		/* counts MCUs processed in current row */
+  int MCU_vert_offset;		/* counts MCU rows within iMCU row */
+  int MCU_rows_per_iMCU_row;	/* number of such rows needed */
+
+  /* For single-pass compression, it's sufficient to buffer just one MCU
+   * (although this may prove a bit slow in practice).  We allocate a
+   * workspace of C_MAX_BLOCKS_IN_MCU coefficient blocks, and reuse it for each
+   * MCU constructed and sent.  (On 80x86, the workspace is FAR even though
+   * it's not really very big; this is to keep the module interfaces unchanged
+   * when a large coefficient buffer is necessary.)
+   * In multi-pass modes, this array points to the current MCU's blocks
+   * within the virtual arrays.
+   */
+  JBLOCKROW MCU_buffer[C_MAX_BLOCKS_IN_MCU];
+
+  /* In multi-pass modes, we need a virtual block array for each component. */
+  jvirt_barray_ptr whole_image[MAX_COMPONENTS];
+} my_coef_controller;
+
+typedef my_coef_controller * my_coef_ptr;
+
+
+/* Forward declarations */
+METHODDEF(boolean) compress_data
+    JPP((j_compress_ptr cinfo, JSAMPIMAGE input_buf));
+#ifdef FULL_COEF_BUFFER_SUPPORTED
+METHODDEF(boolean) compress_first_pass
+    JPP((j_compress_ptr cinfo, JSAMPIMAGE input_buf));
+METHODDEF(boolean) compress_output
+    JPP((j_compress_ptr cinfo, JSAMPIMAGE input_buf));
+#endif
+
+
+LOCAL(void)
+start_iMCU_row (j_compress_ptr cinfo)
+/* Reset within-iMCU-row counters for a new row */
+{
+  my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
+
+  /* In an interleaved scan, an MCU row is the same as an iMCU row.
+   * In a noninterleaved scan, an iMCU row has v_samp_factor MCU rows.
+   * But at the bottom of the image, process only what's left.
+   */
+  if (cinfo->comps_in_scan > 1) {
+    coef->MCU_rows_per_iMCU_row = 1;
+  } else {
+    if (coef->iMCU_row_num < (cinfo->total_iMCU_rows-1))
+      coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->v_samp_factor;
+    else
+      coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->last_row_height;
+  }
+
+  coef->mcu_ctr = 0;
+  coef->MCU_vert_offset = 0;
+}
+
+
+/*
+ * Initialize for a processing pass.
+ */
+
+METHODDEF(void)
+start_pass_coef (j_compress_ptr cinfo, J_BUF_MODE pass_mode)
+{
+  my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
+
+  coef->iMCU_row_num = 0;
+  start_iMCU_row(cinfo);
+
+  switch (pass_mode) {
+  case JBUF_PASS_THRU:
+    if (coef->whole_image[0] != NULL)
+      ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
+    coef->pub.compress_data = compress_data;
+    break;
+#ifdef FULL_COEF_BUFFER_SUPPORTED
+  case JBUF_SAVE_AND_PASS:
+    if (coef->whole_image[0] == NULL)
+      ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
+    coef->pub.compress_data = compress_first_pass;
+    break;
+  case JBUF_CRANK_DEST:
+    if (coef->whole_image[0] == NULL)
+      ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
+    coef->pub.compress_data = compress_output;
+    break;
+#endif
+  default:
+    ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
+    break;
+  }
+}
+
+
+/*
+ * Process some data in the single-pass case.
+ * We process the equivalent of one fully interleaved MCU row ("iMCU" row)
+ * per call, ie, v_samp_factor block rows for each component in the image.
+ * Returns TRUE if the iMCU row is completed, FALSE if suspended.
+ *
+ * NB: input_buf contains a plane for each component in image,
+ * which we index according to the component's SOF position.
+ */
+
+METHODDEF(boolean)
+compress_data (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
+{
+  my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
+  JDIMENSION MCU_col_num;	/* index of current MCU within row */
+  JDIMENSION last_MCU_col = cinfo->MCUs_per_row - 1;
+  JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1;
+  int blkn, bi, ci, yindex, yoffset, blockcnt;
+  JDIMENSION ypos, xpos;
+  jpeg_component_info *compptr;
+
+  /* Loop to write as much as one whole iMCU row */
+  for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row;
+       yoffset++) {
+    for (MCU_col_num = coef->mcu_ctr; MCU_col_num <= last_MCU_col;
+	 MCU_col_num++) {
+      /* Determine where data comes from in input_buf and do the DCT thing.
+       * Each call on forward_DCT processes a horizontal row of DCT blocks
+       * as wide as an MCU; we rely on having allocated the MCU_buffer[] blocks
+       * sequentially.  Dummy blocks at the right or bottom edge are filled in
+       * specially.  The data in them does not matter for image reconstruction,
+       * so we fill them with values that will encode to the smallest amount of
+       * data, viz: all zeroes in the AC entries, DC entries equal to previous
+       * block's DC value.  (Thanks to Thomas Kinsman for this idea.)
+       */
+      blkn = 0;
+      for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
+	compptr = cinfo->cur_comp_info[ci];
+	blockcnt = (MCU_col_num < last_MCU_col) ? compptr->MCU_width
+						: compptr->last_col_width;
+	xpos = MCU_col_num * compptr->MCU_sample_width;
+	ypos = yoffset * DCTSIZE; /* ypos == (yoffset+yindex) * DCTSIZE */
+	for (yindex = 0; yindex < compptr->MCU_height; yindex++) {
+	  if (coef->iMCU_row_num < last_iMCU_row ||
+	      yoffset+yindex < compptr->last_row_height) {
+	    (*cinfo->fdct->forward_DCT) (cinfo, compptr,
+					 input_buf[compptr->component_index],
+					 coef->MCU_buffer[blkn],
+					 ypos, xpos, (JDIMENSION) blockcnt);
+	    if (blockcnt < compptr->MCU_width) {
+	      /* Create some dummy blocks at the right edge of the image. */
+	      jzero_far((void FAR *) coef->MCU_buffer[blkn + blockcnt],
+			(compptr->MCU_width - blockcnt) * SIZEOF(JBLOCK));
+	      for (bi = blockcnt; bi < compptr->MCU_width; bi++) {
+		coef->MCU_buffer[blkn+bi][0][0] = coef->MCU_buffer[blkn+bi-1][0][0];
+	      }
+	    }
+	  } else {
+	    /* Create a row of dummy blocks at the bottom of the image. */
+	    jzero_far((void FAR *) coef->MCU_buffer[blkn],
+		      compptr->MCU_width * SIZEOF(JBLOCK));
+	    for (bi = 0; bi < compptr->MCU_width; bi++) {
+	      coef->MCU_buffer[blkn+bi][0][0] = coef->MCU_buffer[blkn-1][0][0];
+	    }
+	  }
+	  blkn += compptr->MCU_width;
+	  ypos += DCTSIZE;
+	}
+      }
+      /* Try to write the MCU.  In event of a suspension failure, we will
+       * re-DCT the MCU on restart (a bit inefficient, could be fixed...)
+       */
+      if (! (*cinfo->entropy->encode_mcu) (cinfo, coef->MCU_buffer)) {
+	/* Suspension forced; update state counters and exit */
+	coef->MCU_vert_offset = yoffset;
+	coef->mcu_ctr = MCU_col_num;
+	return FALSE;
+      }
+    }
+    /* Completed an MCU row, but perhaps not an iMCU row */
+    coef->mcu_ctr = 0;
+  }
+  /* Completed the iMCU row, advance counters for next one */
+  coef->iMCU_row_num++;
+  start_iMCU_row(cinfo);
+  return TRUE;
+}
+
+
+#ifdef FULL_COEF_BUFFER_SUPPORTED
+
+/*
+ * Process some data in the first pass of a multi-pass case.
+ * We process the equivalent of one fully interleaved MCU row ("iMCU" row)
+ * per call, ie, v_samp_factor block rows for each component in the image.
+ * This amount of data is read from the source buffer, DCT'd and quantized,
+ * and saved into the virtual arrays.  We also generate suitable dummy blocks
+ * as needed at the right and lower edges.  (The dummy blocks are constructed
+ * in the virtual arrays, which have been padded appropriately.)  This makes
+ * it possible for subsequent passes not to worry about real vs. dummy blocks.
+ *
+ * We must also emit the data to the entropy encoder.  This is conveniently
+ * done by calling compress_output() after we've loaded the current strip
+ * of the virtual arrays.
+ *
+ * NB: input_buf contains a plane for each component in image.  All
+ * components are DCT'd and loaded into the virtual arrays in this pass.
+ * However, it may be that only a subset of the components are emitted to
+ * the entropy encoder during this first pass; be careful about looking
+ * at the scan-dependent variables (MCU dimensions, etc).
+ */
+
+METHODDEF(boolean)
+compress_first_pass (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
+{
+  my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
+  JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1;
+  JDIMENSION blocks_across, MCUs_across, MCUindex;
+  int bi, ci, h_samp_factor, block_row, block_rows, ndummy;
+  JCOEF lastDC;
+  jpeg_component_info *compptr;
+  JBLOCKARRAY buffer;
+  JBLOCKROW thisblockrow, lastblockrow;
+
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    /* Align the virtual buffer for this component. */
+    buffer = (*cinfo->mem->access_virt_barray)
+      ((j_common_ptr) cinfo, coef->whole_image[ci],
+       coef->iMCU_row_num * compptr->v_samp_factor,
+       (JDIMENSION) compptr->v_samp_factor, TRUE);
+    /* Count non-dummy DCT block rows in this iMCU row. */
+    if (coef->iMCU_row_num < last_iMCU_row)
+      block_rows = compptr->v_samp_factor;
+    else {
+      /* NB: can't use last_row_height here, since may not be set! */
+      block_rows = (int) (compptr->height_in_blocks % compptr->v_samp_factor);
+      if (block_rows == 0) block_rows = compptr->v_samp_factor;
+    }
+    blocks_across = compptr->width_in_blocks;
+    h_samp_factor = compptr->h_samp_factor;
+    /* Count number of dummy blocks to be added at the right margin. */
+    ndummy = (int) (blocks_across % h_samp_factor);
+    if (ndummy > 0)
+      ndummy = h_samp_factor - ndummy;
+    /* Perform DCT for all non-dummy blocks in this iMCU row.  Each call
+     * on forward_DCT processes a complete horizontal row of DCT blocks.
+     */
+    for (block_row = 0; block_row < block_rows; block_row++) {
+      thisblockrow = buffer[block_row];
+      (*cinfo->fdct->forward_DCT) (cinfo, compptr,
+				   input_buf[ci], thisblockrow,
+				   (JDIMENSION) (block_row * DCTSIZE),
+				   (JDIMENSION) 0, blocks_across);
+      if (ndummy > 0) {
+	/* Create dummy blocks at the right edge of the image. */
+	thisblockrow += blocks_across; /* => first dummy block */
+	jzero_far((void FAR *) thisblockrow, ndummy * SIZEOF(JBLOCK));
+	lastDC = thisblockrow[-1][0];
+	for (bi = 0; bi < ndummy; bi++) {
+	  thisblockrow[bi][0] = lastDC;
+	}
+      }
+    }
+    /* If at end of image, create dummy block rows as needed.
+     * The tricky part here is that within each MCU, we want the DC values
+     * of the dummy blocks to match the last real block's DC value.
+     * This squeezes a few more bytes out of the resulting file...
+     */
+    if (coef->iMCU_row_num == last_iMCU_row) {
+      blocks_across += ndummy;	/* include lower right corner */
+      MCUs_across = blocks_across / h_samp_factor;
+      for (block_row = block_rows; block_row < compptr->v_samp_factor;
+	   block_row++) {
+	thisblockrow = buffer[block_row];
+	lastblockrow = buffer[block_row-1];
+	jzero_far((void FAR *) thisblockrow,
+		  (size_t) (blocks_across * SIZEOF(JBLOCK)));
+	for (MCUindex = 0; MCUindex < MCUs_across; MCUindex++) {
+	  lastDC = lastblockrow[h_samp_factor-1][0];
+	  for (bi = 0; bi < h_samp_factor; bi++) {
+	    thisblockrow[bi][0] = lastDC;
+	  }
+	  thisblockrow += h_samp_factor; /* advance to next MCU in row */
+	  lastblockrow += h_samp_factor;
+	}
+      }
+    }
+  }
+  /* NB: compress_output will increment iMCU_row_num if successful.
+   * A suspension return will result in redoing all the work above next time.
+   */
+
+  /* Emit data to the entropy encoder, sharing code with subsequent passes */
+  return compress_output(cinfo, input_buf);
+}
+
+
+/*
+ * Process some data in subsequent passes of a multi-pass case.
+ * We process the equivalent of one fully interleaved MCU row ("iMCU" row)
+ * per call, ie, v_samp_factor block rows for each component in the scan.
+ * The data is obtained from the virtual arrays and fed to the entropy coder.
+ * Returns TRUE if the iMCU row is completed, FALSE if suspended.
+ *
+ * NB: input_buf is ignored; it is likely to be a NULL pointer.
+ */
+
+METHODDEF(boolean)
+compress_output (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
+{
+  my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
+  JDIMENSION MCU_col_num;	/* index of current MCU within row */
+  int blkn, ci, xindex, yindex, yoffset;
+  JDIMENSION start_col;
+  JBLOCKARRAY buffer[MAX_COMPS_IN_SCAN];
+  JBLOCKROW buffer_ptr;
+  jpeg_component_info *compptr;
+
+  /* Align the virtual buffers for the components used in this scan.
+   * NB: during first pass, this is safe only because the buffers will
+   * already be aligned properly, so jmemmgr.c won't need to do any I/O.
+   */
+  for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
+    compptr = cinfo->cur_comp_info[ci];
+    buffer[ci] = (*cinfo->mem->access_virt_barray)
+      ((j_common_ptr) cinfo, coef->whole_image[compptr->component_index],
+       coef->iMCU_row_num * compptr->v_samp_factor,
+       (JDIMENSION) compptr->v_samp_factor, FALSE);
+  }
+
+  /* Loop to process one whole iMCU row */
+  for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row;
+       yoffset++) {
+    for (MCU_col_num = coef->mcu_ctr; MCU_col_num < cinfo->MCUs_per_row;
+	 MCU_col_num++) {
+      /* Construct list of pointers to DCT blocks belonging to this MCU */
+      blkn = 0;			/* index of current DCT block within MCU */
+      for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
+	compptr = cinfo->cur_comp_info[ci];
+	start_col = MCU_col_num * compptr->MCU_width;
+	for (yindex = 0; yindex < compptr->MCU_height; yindex++) {
+	  buffer_ptr = buffer[ci][yindex+yoffset] + start_col;
+	  for (xindex = 0; xindex < compptr->MCU_width; xindex++) {
+	    coef->MCU_buffer[blkn++] = buffer_ptr++;
+	  }
+	}
+      }
+      /* Try to write the MCU. */
+      if (! (*cinfo->entropy->encode_mcu) (cinfo, coef->MCU_buffer)) {
+	/* Suspension forced; update state counters and exit */
+	coef->MCU_vert_offset = yoffset;
+	coef->mcu_ctr = MCU_col_num;
+	return FALSE;
+      }
+    }
+    /* Completed an MCU row, but perhaps not an iMCU row */
+    coef->mcu_ctr = 0;
+  }
+  /* Completed the iMCU row, advance counters for next one */
+  coef->iMCU_row_num++;
+  start_iMCU_row(cinfo);
+  return TRUE;
+}
+
+#endif /* FULL_COEF_BUFFER_SUPPORTED */
+
+
+/*
+ * Initialize coefficient buffer controller.
+ */
+
+GLOBAL(void)
+jinit_c_coef_controller (j_compress_ptr cinfo, boolean need_full_buffer)
+{
+  my_coef_ptr coef;
+
+  coef = (my_coef_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				SIZEOF(my_coef_controller));
+  cinfo->coef = (struct jpeg_c_coef_controller *) coef;
+  coef->pub.start_pass = start_pass_coef;
+
+  /* Create the coefficient buffer. */
+  if (need_full_buffer) {
+#ifdef FULL_COEF_BUFFER_SUPPORTED
+    /* Allocate a full-image virtual array for each component, */
+    /* padded to a multiple of samp_factor DCT blocks in each direction. */
+    int ci;
+    jpeg_component_info *compptr;
+
+    for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+	 ci++, compptr++) {
+      coef->whole_image[ci] = (*cinfo->mem->request_virt_barray)
+	((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE,
+	 (JDIMENSION) jround_up((long) compptr->width_in_blocks,
+				(long) compptr->h_samp_factor),
+	 (JDIMENSION) jround_up((long) compptr->height_in_blocks,
+				(long) compptr->v_samp_factor),
+	 (JDIMENSION) compptr->v_samp_factor);
+    }
+#else
+    ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
+#endif
+  } else {
+    /* We only need a single-MCU buffer. */
+    JBLOCKROW buffer;
+    int i;
+
+    buffer = (JBLOCKROW)
+      (*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				  C_MAX_BLOCKS_IN_MCU * SIZEOF(JBLOCK));
+    for (i = 0; i < C_MAX_BLOCKS_IN_MCU; i++) {
+      coef->MCU_buffer[i] = buffer + i;
+    }
+    coef->whole_image[0] = NULL; /* flag for no virtual arrays */
+  }
+}
diff --git a/src/libjpeg-turbo/jccolext.c.inc b/src/libjpeg-turbo/jccolext.c.inc
new file mode 100644
index 0000000..acbfa23
--- /dev/null
+++ b/src/libjpeg-turbo/jccolext.c.inc
@@ -0,0 +1,114 @@
+/*
+ * jccolext.c
+ *
+ * Copyright (C) 1991-1996, Thomas G. Lane.
+ * Copyright (C) 2009-2011, D. R. Commander.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains input colorspace conversion routines.
+ */
+
+
+/* This file is included by jccolor.c */
+
+
+/*
+ * Convert some rows of samples to the JPEG colorspace.
+ *
+ * Note that we change from the application's interleaved-pixel format
+ * to our internal noninterleaved, one-plane-per-component format.
+ * The input buffer is therefore three times as wide as the output buffer.
+ *
+ * A starting row offset is provided only for the output buffer.  The caller
+ * can easily adjust the passed input_buf value to accommodate any row
+ * offset required on that side.
+ */
+
+INLINE
+LOCAL(void)
+rgb_ycc_convert_internal (j_compress_ptr cinfo,
+                          JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+                          JDIMENSION output_row, int num_rows)
+{
+  my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
+  register int r, g, b;
+  register INT32 * ctab = cconvert->rgb_ycc_tab;
+  register JSAMPROW inptr;
+  register JSAMPROW outptr0, outptr1, outptr2;
+  register JDIMENSION col;
+  JDIMENSION num_cols = cinfo->image_width;
+
+  while (--num_rows >= 0) {
+    inptr = *input_buf++;
+    outptr0 = output_buf[0][output_row];
+    outptr1 = output_buf[1][output_row];
+    outptr2 = output_buf[2][output_row];
+    output_row++;
+    for (col = 0; col < num_cols; col++) {
+      r = GETJSAMPLE(inptr[RGB_RED]);
+      g = GETJSAMPLE(inptr[RGB_GREEN]);
+      b = GETJSAMPLE(inptr[RGB_BLUE]);
+      inptr += RGB_PIXELSIZE;
+      /* If the inputs are 0..MAXJSAMPLE, the outputs of these equations
+       * must be too; we do not need an explicit range-limiting operation.
+       * Hence the value being shifted is never negative, and we don't
+       * need the general RIGHT_SHIFT macro.
+       */
+      /* Y */
+      outptr0[col] = (JSAMPLE)
+		((ctab[r+R_Y_OFF] + ctab[g+G_Y_OFF] + ctab[b+B_Y_OFF])
+		 >> SCALEBITS);
+      /* Cb */
+      outptr1[col] = (JSAMPLE)
+		((ctab[r+R_CB_OFF] + ctab[g+G_CB_OFF] + ctab[b+B_CB_OFF])
+		 >> SCALEBITS);
+      /* Cr */
+      outptr2[col] = (JSAMPLE)
+		((ctab[r+R_CR_OFF] + ctab[g+G_CR_OFF] + ctab[b+B_CR_OFF])
+		 >> SCALEBITS);
+    }
+  }
+}
+
+
+/**************** Cases other than RGB -> YCbCr **************/
+
+
+/*
+ * Convert some rows of samples to the JPEG colorspace.
+ * This version handles RGB->grayscale conversion, which is the same
+ * as the RGB->Y portion of RGB->YCbCr.
+ * We assume rgb_ycc_start has been called (we only use the Y tables).
+ */
+
+INLINE
+LOCAL(void)
+rgb_gray_convert_internal (j_compress_ptr cinfo,
+                           JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+                           JDIMENSION output_row, int num_rows)
+{
+  my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
+  register int r, g, b;
+  register INT32 * ctab = cconvert->rgb_ycc_tab;
+  register JSAMPROW inptr;
+  register JSAMPROW outptr;
+  register JDIMENSION col;
+  JDIMENSION num_cols = cinfo->image_width;
+
+  while (--num_rows >= 0) {
+    inptr = *input_buf++;
+    outptr = output_buf[0][output_row];
+    output_row++;
+    for (col = 0; col < num_cols; col++) {
+      r = GETJSAMPLE(inptr[RGB_RED]);
+      g = GETJSAMPLE(inptr[RGB_GREEN]);
+      b = GETJSAMPLE(inptr[RGB_BLUE]);
+      inptr += RGB_PIXELSIZE;
+      /* Y */
+      outptr[col] = (JSAMPLE)
+		((ctab[r+R_Y_OFF] + ctab[g+G_Y_OFF] + ctab[b+B_Y_OFF])
+		 >> SCALEBITS);
+    }
+  }
+}
diff --git a/src/libjpeg-turbo/jccolor.c b/src/libjpeg-turbo/jccolor.c
new file mode 100644
index 0000000..ec80df8
--- /dev/null
+++ b/src/libjpeg-turbo/jccolor.c
@@ -0,0 +1,599 @@
+/*
+ * jccolor.c
+ *
+ * Copyright (C) 1991-1996, Thomas G. Lane.
+ * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+ * Copyright (C) 2009-2011, D. R. Commander.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains input colorspace conversion routines.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jsimd.h"
+#include "config.h"
+
+
+/* Private subobject */
+
+typedef struct {
+  struct jpeg_color_converter pub; /* public fields */
+
+  /* Private state for RGB->YCC conversion */
+  INT32 * rgb_ycc_tab;		/* => table for RGB to YCbCr conversion */
+} my_color_converter;
+
+typedef my_color_converter * my_cconvert_ptr;
+
+
+/**************** RGB -> YCbCr conversion: most common case **************/
+
+/*
+ * YCbCr is defined per CCIR 601-1, except that Cb and Cr are
+ * normalized to the range 0..MAXJSAMPLE rather than -0.5 .. 0.5.
+ * The conversion equations to be implemented are therefore
+ *	Y  =  0.29900 * R + 0.58700 * G + 0.11400 * B
+ *	Cb = -0.16874 * R - 0.33126 * G + 0.50000 * B  + CENTERJSAMPLE
+ *	Cr =  0.50000 * R - 0.41869 * G - 0.08131 * B  + CENTERJSAMPLE
+ * (These numbers are derived from TIFF 6.0 section 21, dated 3-June-92.)
+ * Note: older versions of the IJG code used a zero offset of MAXJSAMPLE/2,
+ * rather than CENTERJSAMPLE, for Cb and Cr.  This gave equal positive and
+ * negative swings for Cb/Cr, but meant that grayscale values (Cb=Cr=0)
+ * were not represented exactly.  Now we sacrifice exact representation of
+ * maximum red and maximum blue in order to get exact grayscales.
+ *
+ * To avoid floating-point arithmetic, we represent the fractional constants
+ * as integers scaled up by 2^16 (about 4 digits precision); we have to divide
+ * the products by 2^16, with appropriate rounding, to get the correct answer.
+ *
+ * For even more speed, we avoid doing any multiplications in the inner loop
+ * by precalculating the constants times R,G,B for all possible values.
+ * For 8-bit JSAMPLEs this is very reasonable (only 256 entries per table);
+ * for 12-bit samples it is still acceptable.  It's not very reasonable for
+ * 16-bit samples, but if you want lossless storage you shouldn't be changing
+ * colorspace anyway.
+ * The CENTERJSAMPLE offsets and the rounding fudge-factor of 0.5 are included
+ * in the tables to save adding them separately in the inner loop.
+ */
+
+#define SCALEBITS	16	/* speediest right-shift on some machines */
+#define CBCR_OFFSET	((INT32) CENTERJSAMPLE << SCALEBITS)
+#define ONE_HALF	((INT32) 1 << (SCALEBITS-1))
+#define FIX(x)		((INT32) ((x) * (1L<<SCALEBITS) + 0.5))
+
+/* We allocate one big table and divide it up into eight parts, instead of
+ * doing eight alloc_small requests.  This lets us use a single table base
+ * address, which can be held in a register in the inner loops on many
+ * machines (more than can hold all eight addresses, anyway).
+ */
+
+#define R_Y_OFF		0			/* offset to R => Y section */
+#define G_Y_OFF		(1*(MAXJSAMPLE+1))	/* offset to G => Y section */
+#define B_Y_OFF		(2*(MAXJSAMPLE+1))	/* etc. */
+#define R_CB_OFF	(3*(MAXJSAMPLE+1))
+#define G_CB_OFF	(4*(MAXJSAMPLE+1))
+#define B_CB_OFF	(5*(MAXJSAMPLE+1))
+#define R_CR_OFF	B_CB_OFF		/* B=>Cb, R=>Cr are the same */
+#define G_CR_OFF	(6*(MAXJSAMPLE+1))
+#define B_CR_OFF	(7*(MAXJSAMPLE+1))
+#define TABLE_SIZE	(8*(MAXJSAMPLE+1))
+
+
+/* Include inline routines for colorspace extensions */
+
+#include "jccolext.c.inc"
+#undef RGB_RED
+#undef RGB_GREEN
+#undef RGB_BLUE
+#undef RGB_PIXELSIZE
+
+#define RGB_RED EXT_RGB_RED
+#define RGB_GREEN EXT_RGB_GREEN
+#define RGB_BLUE EXT_RGB_BLUE
+#define RGB_PIXELSIZE EXT_RGB_PIXELSIZE
+#define rgb_ycc_convert_internal extrgb_ycc_convert_internal
+#define rgb_gray_convert_internal extrgb_gray_convert_internal
+#include "jccolext.c.inc"
+#undef RGB_RED
+#undef RGB_GREEN
+#undef RGB_BLUE
+#undef RGB_PIXELSIZE
+#undef rgb_ycc_convert_internal
+#undef rgb_gray_convert_internal
+
+#define RGB_RED EXT_RGBX_RED
+#define RGB_GREEN EXT_RGBX_GREEN
+#define RGB_BLUE EXT_RGBX_BLUE
+#define RGB_PIXELSIZE EXT_RGBX_PIXELSIZE
+#define rgb_ycc_convert_internal extrgbx_ycc_convert_internal
+#define rgb_gray_convert_internal extrgbx_gray_convert_internal
+#include "jccolext.c.inc"
+#undef RGB_RED
+#undef RGB_GREEN
+#undef RGB_BLUE
+#undef RGB_PIXELSIZE
+#undef rgb_ycc_convert_internal
+#undef rgb_gray_convert_internal
+
+#define RGB_RED EXT_BGR_RED
+#define RGB_GREEN EXT_BGR_GREEN
+#define RGB_BLUE EXT_BGR_BLUE
+#define RGB_PIXELSIZE EXT_BGR_PIXELSIZE
+#define rgb_ycc_convert_internal extbgr_ycc_convert_internal
+#define rgb_gray_convert_internal extbgr_gray_convert_internal
+#include "jccolext.c.inc"
+#undef RGB_RED
+#undef RGB_GREEN
+#undef RGB_BLUE
+#undef RGB_PIXELSIZE
+#undef rgb_ycc_convert_internal
+#undef rgb_gray_convert_internal
+
+#define RGB_RED EXT_BGRX_RED
+#define RGB_GREEN EXT_BGRX_GREEN
+#define RGB_BLUE EXT_BGRX_BLUE
+#define RGB_PIXELSIZE EXT_BGRX_PIXELSIZE
+#define rgb_ycc_convert_internal extbgrx_ycc_convert_internal
+#define rgb_gray_convert_internal extbgrx_gray_convert_internal
+#include "jccolext.c.inc"
+#undef RGB_RED
+#undef RGB_GREEN
+#undef RGB_BLUE
+#undef RGB_PIXELSIZE
+#undef rgb_ycc_convert_internal
+#undef rgb_gray_convert_internal
+
+#define RGB_RED EXT_XBGR_RED
+#define RGB_GREEN EXT_XBGR_GREEN
+#define RGB_BLUE EXT_XBGR_BLUE
+#define RGB_PIXELSIZE EXT_XBGR_PIXELSIZE
+#define rgb_ycc_convert_internal extxbgr_ycc_convert_internal
+#define rgb_gray_convert_internal extxbgr_gray_convert_internal
+#include "jccolext.c.inc"
+#undef RGB_RED
+#undef RGB_GREEN
+#undef RGB_BLUE
+#undef RGB_PIXELSIZE
+#undef rgb_ycc_convert_internal
+#undef rgb_gray_convert_internal
+
+#define RGB_RED EXT_XRGB_RED
+#define RGB_GREEN EXT_XRGB_GREEN
+#define RGB_BLUE EXT_XRGB_BLUE
+#define RGB_PIXELSIZE EXT_XRGB_PIXELSIZE
+#define rgb_ycc_convert_internal extxrgb_ycc_convert_internal
+#define rgb_gray_convert_internal extxrgb_gray_convert_internal
+#include "jccolext.c.inc"
+#undef RGB_RED
+#undef RGB_GREEN
+#undef RGB_BLUE
+#undef RGB_PIXELSIZE
+#undef rgb_ycc_convert_internal
+#undef rgb_gray_convert_internal
+
+
+/*
+ * Initialize for RGB->YCC colorspace conversion.
+ */
+
+METHODDEF(void)
+rgb_ycc_start (j_compress_ptr cinfo)
+{
+  my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
+  INT32 * rgb_ycc_tab;
+  INT32 i;
+
+  /* Allocate and fill in the conversion tables. */
+  cconvert->rgb_ycc_tab = rgb_ycc_tab = (INT32 *)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				(TABLE_SIZE * SIZEOF(INT32)));
+
+  for (i = 0; i <= MAXJSAMPLE; i++) {
+    rgb_ycc_tab[i+R_Y_OFF] = FIX(0.29900) * i;
+    rgb_ycc_tab[i+G_Y_OFF] = FIX(0.58700) * i;
+    rgb_ycc_tab[i+B_Y_OFF] = FIX(0.11400) * i     + ONE_HALF;
+    rgb_ycc_tab[i+R_CB_OFF] = (-FIX(0.16874)) * i;
+    rgb_ycc_tab[i+G_CB_OFF] = (-FIX(0.33126)) * i;
+    /* We use a rounding fudge-factor of 0.5-epsilon for Cb and Cr.
+     * This ensures that the maximum output will round to MAXJSAMPLE
+     * not MAXJSAMPLE+1, and thus that we don't have to range-limit.
+     */
+    rgb_ycc_tab[i+B_CB_OFF] = FIX(0.50000) * i    + CBCR_OFFSET + ONE_HALF-1;
+/*  B=>Cb and R=>Cr tables are the same
+    rgb_ycc_tab[i+R_CR_OFF] = FIX(0.50000) * i    + CBCR_OFFSET + ONE_HALF-1;
+*/
+    rgb_ycc_tab[i+G_CR_OFF] = (-FIX(0.41869)) * i;
+    rgb_ycc_tab[i+B_CR_OFF] = (-FIX(0.08131)) * i;
+  }
+}
+
+
+/*
+ * Convert some rows of samples to the JPEG colorspace.
+ */
+
+METHODDEF(void)
+rgb_ycc_convert (j_compress_ptr cinfo,
+		 JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+		 JDIMENSION output_row, int num_rows)
+{
+  switch (cinfo->in_color_space) {
+    case JCS_EXT_RGB:
+      extrgb_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
+                                  num_rows);
+      break;
+    case JCS_EXT_RGBX:
+    case JCS_EXT_RGBA:
+      extrgbx_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
+                                   num_rows);
+      break;
+    case JCS_EXT_BGR:
+      extbgr_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
+                                  num_rows);
+      break;
+    case JCS_EXT_BGRX:
+    case JCS_EXT_BGRA:
+      extbgrx_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
+                                   num_rows);
+      break;
+    case JCS_EXT_XBGR:
+    case JCS_EXT_ABGR:
+      extxbgr_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
+                                   num_rows);
+      break;
+    case JCS_EXT_XRGB:
+    case JCS_EXT_ARGB:
+      extxrgb_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
+                                   num_rows);
+      break;
+    default:
+      rgb_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
+                               num_rows);
+      break;
+  }
+}
+
+
+/**************** Cases other than RGB -> YCbCr **************/
+
+
+/*
+ * Convert some rows of samples to the JPEG colorspace.
+ */
+
+METHODDEF(void)
+rgb_gray_convert (j_compress_ptr cinfo,
+		  JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+		  JDIMENSION output_row, int num_rows)
+{
+  switch (cinfo->in_color_space) {
+    case JCS_EXT_RGB:
+      extrgb_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
+                                   num_rows);
+      break;
+    case JCS_EXT_RGBX:
+    case JCS_EXT_RGBA:
+      extrgbx_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
+                                    num_rows);
+      break;
+    case JCS_EXT_BGR:
+      extbgr_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
+                                   num_rows);
+      break;
+    case JCS_EXT_BGRX:
+    case JCS_EXT_BGRA:
+      extbgrx_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
+                                    num_rows);
+      break;
+    case JCS_EXT_XBGR:
+    case JCS_EXT_ABGR:
+      extxbgr_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
+                                    num_rows);
+      break;
+    case JCS_EXT_XRGB:
+    case JCS_EXT_ARGB:
+      extxrgb_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
+                                    num_rows);
+      break;
+    default:
+      rgb_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
+                                num_rows);
+      break;
+  }
+}
+
+
+/*
+ * Convert some rows of samples to the JPEG colorspace.
+ * This version handles Adobe-style CMYK->YCCK conversion,
+ * where we convert R=1-C, G=1-M, and B=1-Y to YCbCr using the same
+ * conversion as above, while passing K (black) unchanged.
+ * We assume rgb_ycc_start has been called.
+ */
+
+METHODDEF(void)
+cmyk_ycck_convert (j_compress_ptr cinfo,
+		   JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+		   JDIMENSION output_row, int num_rows)
+{
+  my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
+  register int r, g, b;
+  register INT32 * ctab = cconvert->rgb_ycc_tab;
+  register JSAMPROW inptr;
+  register JSAMPROW outptr0, outptr1, outptr2, outptr3;
+  register JDIMENSION col;
+  JDIMENSION num_cols = cinfo->image_width;
+
+  while (--num_rows >= 0) {
+    inptr = *input_buf++;
+    outptr0 = output_buf[0][output_row];
+    outptr1 = output_buf[1][output_row];
+    outptr2 = output_buf[2][output_row];
+    outptr3 = output_buf[3][output_row];
+    output_row++;
+    for (col = 0; col < num_cols; col++) {
+      r = MAXJSAMPLE - GETJSAMPLE(inptr[0]);
+      g = MAXJSAMPLE - GETJSAMPLE(inptr[1]);
+      b = MAXJSAMPLE - GETJSAMPLE(inptr[2]);
+      /* K passes through as-is */
+      outptr3[col] = inptr[3];	/* don't need GETJSAMPLE here */
+      inptr += 4;
+      /* If the inputs are 0..MAXJSAMPLE, the outputs of these equations
+       * must be too; we do not need an explicit range-limiting operation.
+       * Hence the value being shifted is never negative, and we don't
+       * need the general RIGHT_SHIFT macro.
+       */
+      /* Y */
+      outptr0[col] = (JSAMPLE)
+		((ctab[r+R_Y_OFF] + ctab[g+G_Y_OFF] + ctab[b+B_Y_OFF])
+		 >> SCALEBITS);
+      /* Cb */
+      outptr1[col] = (JSAMPLE)
+		((ctab[r+R_CB_OFF] + ctab[g+G_CB_OFF] + ctab[b+B_CB_OFF])
+		 >> SCALEBITS);
+      /* Cr */
+      outptr2[col] = (JSAMPLE)
+		((ctab[r+R_CR_OFF] + ctab[g+G_CR_OFF] + ctab[b+B_CR_OFF])
+		 >> SCALEBITS);
+    }
+  }
+}
+
+
+/*
+ * Convert some rows of samples to the JPEG colorspace.
+ * This version handles grayscale output with no conversion.
+ * The source can be either plain grayscale or YCbCr (since Y == gray).
+ */
+
+METHODDEF(void)
+grayscale_convert (j_compress_ptr cinfo,
+		   JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+		   JDIMENSION output_row, int num_rows)
+{
+  register JSAMPROW inptr;
+  register JSAMPROW outptr;
+  register JDIMENSION col;
+  JDIMENSION num_cols = cinfo->image_width;
+  int instride = cinfo->input_components;
+
+  while (--num_rows >= 0) {
+    inptr = *input_buf++;
+    outptr = output_buf[0][output_row];
+    output_row++;
+    for (col = 0; col < num_cols; col++) {
+      outptr[col] = inptr[0];	/* don't need GETJSAMPLE() here */
+      inptr += instride;
+    }
+  }
+}
+
+
+/*
+ * Convert some rows of samples to the JPEG colorspace.
+ * This version handles multi-component colorspaces without conversion.
+ * We assume input_components == num_components.
+ */
+
+METHODDEF(void)
+null_convert (j_compress_ptr cinfo,
+	      JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+	      JDIMENSION output_row, int num_rows)
+{
+  register JSAMPROW inptr;
+  register JSAMPROW outptr;
+  register JDIMENSION col;
+  register int ci;
+  int nc = cinfo->num_components;
+  JDIMENSION num_cols = cinfo->image_width;
+
+  while (--num_rows >= 0) {
+    /* It seems fastest to make a separate pass for each component. */
+    for (ci = 0; ci < nc; ci++) {
+      inptr = *input_buf;
+      outptr = output_buf[ci][output_row];
+      for (col = 0; col < num_cols; col++) {
+	outptr[col] = inptr[ci]; /* don't need GETJSAMPLE() here */
+	inptr += nc;
+      }
+    }
+    input_buf++;
+    output_row++;
+  }
+}
+
+
+/*
+ * Empty method for start_pass.
+ */
+
+METHODDEF(void)
+null_method (j_compress_ptr cinfo)
+{
+  /* no work needed */
+}
+
+
+/*
+ * Module initialization routine for input colorspace conversion.
+ */
+
+GLOBAL(void)
+jinit_color_converter (j_compress_ptr cinfo)
+{
+  my_cconvert_ptr cconvert;
+
+  cconvert = (my_cconvert_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				SIZEOF(my_color_converter));
+  cinfo->cconvert = (struct jpeg_color_converter *) cconvert;
+  /* set start_pass to null method until we find out differently */
+  cconvert->pub.start_pass = null_method;
+
+  /* Make sure input_components agrees with in_color_space */
+  switch (cinfo->in_color_space) {
+  case JCS_GRAYSCALE:
+    if (cinfo->input_components != 1)
+      ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
+    break;
+
+  case JCS_RGB:
+  case JCS_EXT_RGB:
+  case JCS_EXT_RGBX:
+  case JCS_EXT_BGR:
+  case JCS_EXT_BGRX:
+  case JCS_EXT_XBGR:
+  case JCS_EXT_XRGB:
+  case JCS_EXT_RGBA:
+  case JCS_EXT_BGRA:
+  case JCS_EXT_ABGR:
+  case JCS_EXT_ARGB:
+    if (cinfo->input_components != rgb_pixelsize[cinfo->in_color_space])
+      ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
+    break;
+
+  case JCS_YCbCr:
+    if (cinfo->input_components != 3)
+      ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
+    break;
+
+  case JCS_CMYK:
+  case JCS_YCCK:
+    if (cinfo->input_components != 4)
+      ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
+    break;
+
+  default:			/* JCS_UNKNOWN can be anything */
+    if (cinfo->input_components < 1)
+      ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
+    break;
+  }
+
+  /* Check num_components, set conversion method based on requested space */
+  switch (cinfo->jpeg_color_space) {
+  case JCS_GRAYSCALE:
+    if (cinfo->num_components != 1)
+      ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
+    if (cinfo->in_color_space == JCS_GRAYSCALE)
+      cconvert->pub.color_convert = grayscale_convert;
+    else if (cinfo->in_color_space == JCS_RGB ||
+             cinfo->in_color_space == JCS_EXT_RGB ||
+             cinfo->in_color_space == JCS_EXT_RGBX ||
+             cinfo->in_color_space == JCS_EXT_BGR ||
+             cinfo->in_color_space == JCS_EXT_BGRX ||
+             cinfo->in_color_space == JCS_EXT_XBGR ||
+             cinfo->in_color_space == JCS_EXT_XRGB ||
+             cinfo->in_color_space == JCS_EXT_RGBA ||
+             cinfo->in_color_space == JCS_EXT_BGRA ||
+             cinfo->in_color_space == JCS_EXT_ABGR ||
+             cinfo->in_color_space == JCS_EXT_ARGB) {
+      if (jsimd_can_rgb_gray())
+        cconvert->pub.color_convert = jsimd_rgb_gray_convert;
+      else {
+        cconvert->pub.start_pass = rgb_ycc_start;
+        cconvert->pub.color_convert = rgb_gray_convert;
+      }
+    } else if (cinfo->in_color_space == JCS_YCbCr)
+      cconvert->pub.color_convert = grayscale_convert;
+    else
+      ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
+    break;
+
+  case JCS_RGB:
+  case JCS_EXT_RGB:
+  case JCS_EXT_RGBX:
+  case JCS_EXT_BGR:
+  case JCS_EXT_BGRX:
+  case JCS_EXT_XBGR:
+  case JCS_EXT_XRGB:
+  case JCS_EXT_RGBA:
+  case JCS_EXT_BGRA:
+  case JCS_EXT_ABGR:
+  case JCS_EXT_ARGB:
+    if (cinfo->num_components != 3)
+      ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
+    if (cinfo->in_color_space == cinfo->jpeg_color_space &&
+      rgb_pixelsize[cinfo->in_color_space] == 3)
+      cconvert->pub.color_convert = null_convert;
+    else
+      ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
+    break;
+
+  case JCS_YCbCr:
+    if (cinfo->num_components != 3)
+      ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
+    if (cinfo->in_color_space == JCS_RGB ||
+        cinfo->in_color_space == JCS_EXT_RGB ||
+        cinfo->in_color_space == JCS_EXT_RGBX ||
+        cinfo->in_color_space == JCS_EXT_BGR ||
+        cinfo->in_color_space == JCS_EXT_BGRX ||
+        cinfo->in_color_space == JCS_EXT_XBGR ||
+        cinfo->in_color_space == JCS_EXT_XRGB ||
+        cinfo->in_color_space == JCS_EXT_RGBA ||
+        cinfo->in_color_space == JCS_EXT_BGRA ||
+        cinfo->in_color_space == JCS_EXT_ABGR ||
+        cinfo->in_color_space == JCS_EXT_ARGB) {
+      if (jsimd_can_rgb_ycc())
+        cconvert->pub.color_convert = jsimd_rgb_ycc_convert;
+      else {
+        cconvert->pub.start_pass = rgb_ycc_start;
+        cconvert->pub.color_convert = rgb_ycc_convert;
+      }
+    } else if (cinfo->in_color_space == JCS_YCbCr)
+      cconvert->pub.color_convert = null_convert;
+    else
+      ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
+    break;
+
+  case JCS_CMYK:
+    if (cinfo->num_components != 4)
+      ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
+    if (cinfo->in_color_space == JCS_CMYK)
+      cconvert->pub.color_convert = null_convert;
+    else
+      ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
+    break;
+
+  case JCS_YCCK:
+    if (cinfo->num_components != 4)
+      ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
+    if (cinfo->in_color_space == JCS_CMYK) {
+      cconvert->pub.start_pass = rgb_ycc_start;
+      cconvert->pub.color_convert = cmyk_ycck_convert;
+    } else if (cinfo->in_color_space == JCS_YCCK)
+      cconvert->pub.color_convert = null_convert;
+    else
+      ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
+    break;
+
+  default:			/* allow null conversion of JCS_UNKNOWN */
+    if (cinfo->jpeg_color_space != cinfo->in_color_space ||
+	cinfo->num_components != cinfo->input_components)
+      ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
+    cconvert->pub.color_convert = null_convert;
+    break;
+  }
+}
diff --git a/src/libjpeg-turbo/jcdctmgr.c b/src/libjpeg-turbo/jcdctmgr.c
new file mode 100644
index 0000000..12f8872
--- /dev/null
+++ b/src/libjpeg-turbo/jcdctmgr.c
@@ -0,0 +1,642 @@
+/*
+ * jcdctmgr.c
+ *
+ * Copyright (C) 1994-1996, Thomas G. Lane.
+ * Copyright (C) 1999-2006, MIYASAKA Masaru.
+ * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+ * Copyright (C) 2011 D. R. Commander
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains the forward-DCT management logic.
+ * This code selects a particular DCT implementation to be used,
+ * and it performs related housekeeping chores including coefficient
+ * quantization.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jdct.h"		/* Private declarations for DCT subsystem */
+#include "jsimddct.h"
+
+
+/* Private subobject for this module */
+
+typedef JMETHOD(void, forward_DCT_method_ptr, (DCTELEM * data));
+typedef JMETHOD(void, float_DCT_method_ptr, (FAST_FLOAT * data));
+
+typedef JMETHOD(void, convsamp_method_ptr,
+                (JSAMPARRAY sample_data, JDIMENSION start_col,
+                 DCTELEM * workspace));
+typedef JMETHOD(void, float_convsamp_method_ptr,
+                (JSAMPARRAY sample_data, JDIMENSION start_col,
+                 FAST_FLOAT *workspace));
+
+typedef JMETHOD(void, quantize_method_ptr,
+                (JCOEFPTR coef_block, DCTELEM * divisors,
+                 DCTELEM * workspace));
+typedef JMETHOD(void, float_quantize_method_ptr,
+                (JCOEFPTR coef_block, FAST_FLOAT * divisors,
+                 FAST_FLOAT * workspace));
+
+METHODDEF(void) quantize (JCOEFPTR, DCTELEM *, DCTELEM *);
+
+typedef struct {
+  struct jpeg_forward_dct pub;	/* public fields */
+
+  /* Pointer to the DCT routine actually in use */
+  forward_DCT_method_ptr dct;
+  convsamp_method_ptr convsamp;
+  quantize_method_ptr quantize;
+
+  /* The actual post-DCT divisors --- not identical to the quant table
+   * entries, because of scaling (especially for an unnormalized DCT).
+   * Each table is given in normal array order.
+   */
+  DCTELEM * divisors[NUM_QUANT_TBLS];
+
+  /* work area for FDCT subroutine */
+  DCTELEM * workspace;
+
+#ifdef DCT_FLOAT_SUPPORTED
+  /* Same as above for the floating-point case. */
+  float_DCT_method_ptr float_dct;
+  float_convsamp_method_ptr float_convsamp;
+  float_quantize_method_ptr float_quantize;
+  FAST_FLOAT * float_divisors[NUM_QUANT_TBLS];
+  FAST_FLOAT * float_workspace;
+#endif
+} my_fdct_controller;
+
+typedef my_fdct_controller * my_fdct_ptr;
+
+
+/*
+ * Find the highest bit in an integer through binary search.
+ */
+LOCAL(int)
+flss (UINT16 val)
+{
+  int bit;
+
+  bit = 16;
+
+  if (!val)
+    return 0;
+
+  if (!(val & 0xff00)) {
+    bit -= 8;
+    val <<= 8;
+  }
+  if (!(val & 0xf000)) {
+    bit -= 4;
+    val <<= 4;
+  }
+  if (!(val & 0xc000)) {
+    bit -= 2;
+    val <<= 2;
+  }
+  if (!(val & 0x8000)) {
+    bit -= 1;
+    val <<= 1;
+  }
+
+  return bit;
+}
+
+/*
+ * Compute values to do a division using reciprocal.
+ *
+ * This implementation is based on an algorithm described in
+ *   "How to optimize for the Pentium family of microprocessors"
+ *   (http://www.agner.org/assem/).
+ * More information about the basic algorithm can be found in
+ * the paper "Integer Division Using Reciprocals" by Robert Alverson.
+ *
+ * The basic idea is to replace x/d by x * d^-1. In order to store
+ * d^-1 with enough precision we shift it left a few places. It turns
+ * out that this algoright gives just enough precision, and also fits
+ * into DCTELEM:
+ *
+ *   b = (the number of significant bits in divisor) - 1
+ *   r = (word size) + b
+ *   f = 2^r / divisor
+ *
+ * f will not be an integer for most cases, so we need to compensate
+ * for the rounding error introduced:
+ *
+ *   no fractional part:
+ *
+ *       result = input >> r
+ *
+ *   fractional part of f < 0.5:
+ *
+ *       round f down to nearest integer
+ *       result = ((input + 1) * f) >> r
+ *
+ *   fractional part of f > 0.5:
+ *
+ *       round f up to nearest integer
+ *       result = (input * f) >> r
+ *
+ * This is the original algorithm that gives truncated results. But we
+ * want properly rounded results, so we replace "input" with
+ * "input + divisor/2".
+ *
+ * In order to allow SIMD implementations we also tweak the values to
+ * allow the same calculation to be made at all times:
+ * 
+ *   dctbl[0] = f rounded to nearest integer
+ *   dctbl[1] = divisor / 2 (+ 1 if fractional part of f < 0.5)
+ *   dctbl[2] = 1 << ((word size) * 2 - r)
+ *   dctbl[3] = r - (word size)
+ *
+ * dctbl[2] is for stupid instruction sets where the shift operation
+ * isn't member wise (e.g. MMX).
+ *
+ * The reason dctbl[2] and dctbl[3] reduce the shift with (word size)
+ * is that most SIMD implementations have a "multiply and store top
+ * half" operation.
+ *
+ * Lastly, we store each of the values in their own table instead
+ * of in a consecutive manner, yet again in order to allow SIMD
+ * routines.
+ */
+LOCAL(int)
+compute_reciprocal (UINT16 divisor, DCTELEM * dtbl)
+{
+  UDCTELEM2 fq, fr;
+  UDCTELEM c;
+  int b, r;
+
+  b = flss(divisor) - 1;
+  r  = sizeof(DCTELEM) * 8 + b;
+
+  fq = ((UDCTELEM2)1 << r) / divisor;
+  fr = ((UDCTELEM2)1 << r) % divisor;
+
+  c = divisor / 2; /* for rounding */
+
+  if (fr == 0) { /* divisor is power of two */
+    /* fq will be one bit too large to fit in DCTELEM, so adjust */
+    fq >>= 1;
+    r--;
+  } else if (fr <= (divisor / 2U)) { /* fractional part is < 0.5 */
+    c++;
+  } else { /* fractional part is > 0.5 */
+    fq++;
+  }
+
+  dtbl[DCTSIZE2 * 0] = (DCTELEM) fq;      /* reciprocal */
+  dtbl[DCTSIZE2 * 1] = (DCTELEM) c;       /* correction + roundfactor */
+  dtbl[DCTSIZE2 * 2] = (DCTELEM) (1 << (sizeof(DCTELEM)*8*2 - r));  /* scale */
+  dtbl[DCTSIZE2 * 3] = (DCTELEM) r - sizeof(DCTELEM)*8; /* shift */
+
+  if(r <= 16) return 0;
+  else return 1;
+}
+
+/*
+ * Initialize for a processing pass.
+ * Verify that all referenced Q-tables are present, and set up
+ * the divisor table for each one.
+ * In the current implementation, DCT of all components is done during
+ * the first pass, even if only some components will be output in the
+ * first scan.  Hence all components should be examined here.
+ */
+
+METHODDEF(void)
+start_pass_fdctmgr (j_compress_ptr cinfo)
+{
+  my_fdct_ptr fdct = (my_fdct_ptr) cinfo->fdct;
+  int ci, qtblno, i;
+  jpeg_component_info *compptr;
+  JQUANT_TBL * qtbl;
+  DCTELEM * dtbl;
+
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    qtblno = compptr->quant_tbl_no;
+    /* Make sure specified quantization table is present */
+    if (qtblno < 0 || qtblno >= NUM_QUANT_TBLS ||
+	cinfo->quant_tbl_ptrs[qtblno] == NULL)
+      ERREXIT1(cinfo, JERR_NO_QUANT_TABLE, qtblno);
+    qtbl = cinfo->quant_tbl_ptrs[qtblno];
+    /* Compute divisors for this quant table */
+    /* We may do this more than once for same table, but it's not a big deal */
+    switch (cinfo->dct_method) {
+#ifdef DCT_ISLOW_SUPPORTED
+    case JDCT_ISLOW:
+      /* For LL&M IDCT method, divisors are equal to raw quantization
+       * coefficients multiplied by 8 (to counteract scaling).
+       */
+      if (fdct->divisors[qtblno] == NULL) {
+	fdct->divisors[qtblno] = (DCTELEM *)
+	  (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				      (DCTSIZE2 * 4) * SIZEOF(DCTELEM));
+      }
+      dtbl = fdct->divisors[qtblno];
+      for (i = 0; i < DCTSIZE2; i++) {
+	if(!compute_reciprocal(qtbl->quantval[i] << 3, &dtbl[i])
+	  && fdct->quantize == jsimd_quantize)
+	  fdct->quantize = quantize;
+      }
+      break;
+#endif
+#ifdef DCT_IFAST_SUPPORTED
+    case JDCT_IFAST:
+      {
+	/* For AA&N IDCT method, divisors are equal to quantization
+	 * coefficients scaled by scalefactor[row]*scalefactor[col], where
+	 *   scalefactor[0] = 1
+	 *   scalefactor[k] = cos(k*PI/16) * sqrt(2)    for k=1..7
+	 * We apply a further scale factor of 8.
+	 */
+#define CONST_BITS 14
+	static const INT16 aanscales[DCTSIZE2] = {
+	  /* precomputed values scaled up by 14 bits */
+	  16384, 22725, 21407, 19266, 16384, 12873,  8867,  4520,
+	  22725, 31521, 29692, 26722, 22725, 17855, 12299,  6270,
+	  21407, 29692, 27969, 25172, 21407, 16819, 11585,  5906,
+	  19266, 26722, 25172, 22654, 19266, 15137, 10426,  5315,
+	  16384, 22725, 21407, 19266, 16384, 12873,  8867,  4520,
+	  12873, 17855, 16819, 15137, 12873, 10114,  6967,  3552,
+	   8867, 12299, 11585, 10426,  8867,  6967,  4799,  2446,
+	   4520,  6270,  5906,  5315,  4520,  3552,  2446,  1247
+	};
+	SHIFT_TEMPS
+
+	if (fdct->divisors[qtblno] == NULL) {
+	  fdct->divisors[qtblno] = (DCTELEM *)
+	    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+					(DCTSIZE2 * 4) * SIZEOF(DCTELEM));
+	}
+	dtbl = fdct->divisors[qtblno];
+	for (i = 0; i < DCTSIZE2; i++) {
+	  if(!compute_reciprocal(
+	    DESCALE(MULTIPLY16V16((INT32) qtbl->quantval[i],
+				  (INT32) aanscales[i]),
+		    CONST_BITS-3), &dtbl[i])
+	    && fdct->quantize == jsimd_quantize)
+	    fdct->quantize = quantize;
+	}
+      }
+      break;
+#endif
+#ifdef DCT_FLOAT_SUPPORTED
+    case JDCT_FLOAT:
+      {
+	/* For float AA&N IDCT method, divisors are equal to quantization
+	 * coefficients scaled by scalefactor[row]*scalefactor[col], where
+	 *   scalefactor[0] = 1
+	 *   scalefactor[k] = cos(k*PI/16) * sqrt(2)    for k=1..7
+	 * We apply a further scale factor of 8.
+	 * What's actually stored is 1/divisor so that the inner loop can
+	 * use a multiplication rather than a division.
+	 */
+	FAST_FLOAT * fdtbl;
+	int row, col;
+	static const double aanscalefactor[DCTSIZE] = {
+	  1.0, 1.387039845, 1.306562965, 1.175875602,
+	  1.0, 0.785694958, 0.541196100, 0.275899379
+	};
+
+	if (fdct->float_divisors[qtblno] == NULL) {
+	  fdct->float_divisors[qtblno] = (FAST_FLOAT *)
+	    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+					DCTSIZE2 * SIZEOF(FAST_FLOAT));
+	}
+	fdtbl = fdct->float_divisors[qtblno];
+	i = 0;
+	for (row = 0; row < DCTSIZE; row++) {
+	  for (col = 0; col < DCTSIZE; col++) {
+	    fdtbl[i] = (FAST_FLOAT)
+	      (1.0 / (((double) qtbl->quantval[i] *
+		       aanscalefactor[row] * aanscalefactor[col] * 8.0)));
+	    i++;
+	  }
+	}
+      }
+      break;
+#endif
+    default:
+      ERREXIT(cinfo, JERR_NOT_COMPILED);
+      break;
+    }
+  }
+}
+
+
+/*
+ * Load data into workspace, applying unsigned->signed conversion.
+ */
+
+METHODDEF(void)
+convsamp (JSAMPARRAY sample_data, JDIMENSION start_col, DCTELEM * workspace)
+{
+  register DCTELEM *workspaceptr;
+  register JSAMPROW elemptr;
+  register int elemr;
+
+  workspaceptr = workspace;
+  for (elemr = 0; elemr < DCTSIZE; elemr++) {
+    elemptr = sample_data[elemr] + start_col;
+
+#if DCTSIZE == 8		/* unroll the inner loop */
+    *workspaceptr++ = GETJSAMPLE(*elemptr++) - CENTERJSAMPLE;
+    *workspaceptr++ = GETJSAMPLE(*elemptr++) - CENTERJSAMPLE;
+    *workspaceptr++ = GETJSAMPLE(*elemptr++) - CENTERJSAMPLE;
+    *workspaceptr++ = GETJSAMPLE(*elemptr++) - CENTERJSAMPLE;
+    *workspaceptr++ = GETJSAMPLE(*elemptr++) - CENTERJSAMPLE;
+    *workspaceptr++ = GETJSAMPLE(*elemptr++) - CENTERJSAMPLE;
+    *workspaceptr++ = GETJSAMPLE(*elemptr++) - CENTERJSAMPLE;
+    *workspaceptr++ = GETJSAMPLE(*elemptr++) - CENTERJSAMPLE;
+#else
+    {
+      register int elemc;
+      for (elemc = DCTSIZE; elemc > 0; elemc--)
+        *workspaceptr++ = GETJSAMPLE(*elemptr++) - CENTERJSAMPLE;
+    }
+#endif
+  }
+}
+
+
+/*
+ * Quantize/descale the coefficients, and store into coef_blocks[].
+ */
+
+METHODDEF(void)
+quantize (JCOEFPTR coef_block, DCTELEM * divisors, DCTELEM * workspace)
+{
+  int i;
+  DCTELEM temp;
+  UDCTELEM recip, corr, shift;
+  UDCTELEM2 product;
+  JCOEFPTR output_ptr = coef_block;
+
+  for (i = 0; i < DCTSIZE2; i++) {
+    temp = workspace[i];
+    recip = divisors[i + DCTSIZE2 * 0];
+    corr =  divisors[i + DCTSIZE2 * 1];
+    shift = divisors[i + DCTSIZE2 * 3];
+
+    if (temp < 0) {
+      temp = -temp;
+      product = (UDCTELEM2)(temp + corr) * recip;
+      product >>= shift + sizeof(DCTELEM)*8;
+      temp = product;
+      temp = -temp;
+    } else {
+      product = (UDCTELEM2)(temp + corr) * recip;
+      product >>= shift + sizeof(DCTELEM)*8;
+      temp = product;
+    }
+
+    output_ptr[i] = (JCOEF) temp;
+  }
+}
+
+
+/*
+ * Perform forward DCT on one or more blocks of a component.
+ *
+ * The input samples are taken from the sample_data[] array starting at
+ * position start_row/start_col, and moving to the right for any additional
+ * blocks. The quantized coefficients are returned in coef_blocks[].
+ */
+
+METHODDEF(void)
+forward_DCT (j_compress_ptr cinfo, jpeg_component_info * compptr,
+	     JSAMPARRAY sample_data, JBLOCKROW coef_blocks,
+	     JDIMENSION start_row, JDIMENSION start_col,
+	     JDIMENSION num_blocks)
+/* This version is used for integer DCT implementations. */
+{
+  /* This routine is heavily used, so it's worth coding it tightly. */
+  my_fdct_ptr fdct = (my_fdct_ptr) cinfo->fdct;
+  DCTELEM * divisors = fdct->divisors[compptr->quant_tbl_no];
+  DCTELEM * workspace;
+  JDIMENSION bi;
+
+  /* Make sure the compiler doesn't look up these every pass */
+  forward_DCT_method_ptr do_dct = fdct->dct;
+  convsamp_method_ptr do_convsamp = fdct->convsamp;
+  quantize_method_ptr do_quantize = fdct->quantize;
+  workspace = fdct->workspace;
+
+  sample_data += start_row;	/* fold in the vertical offset once */
+
+  for (bi = 0; bi < num_blocks; bi++, start_col += DCTSIZE) {
+    /* Load data into workspace, applying unsigned->signed conversion */
+    (*do_convsamp) (sample_data, start_col, workspace);
+
+    /* Perform the DCT */
+    (*do_dct) (workspace);
+
+    /* Quantize/descale the coefficients, and store into coef_blocks[] */
+    (*do_quantize) (coef_blocks[bi], divisors, workspace);
+  }
+}
+
+
+#ifdef DCT_FLOAT_SUPPORTED
+
+
+METHODDEF(void)
+convsamp_float (JSAMPARRAY sample_data, JDIMENSION start_col, FAST_FLOAT * workspace)
+{
+  register FAST_FLOAT *workspaceptr;
+  register JSAMPROW elemptr;
+  register int elemr;
+
+  workspaceptr = workspace;
+  for (elemr = 0; elemr < DCTSIZE; elemr++) {
+    elemptr = sample_data[elemr] + start_col;
+#if DCTSIZE == 8		/* unroll the inner loop */
+    *workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE);
+    *workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE);
+    *workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE);
+    *workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE);
+    *workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE);
+    *workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE);
+    *workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE);
+    *workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE);
+#else
+    {
+      register int elemc;
+      for (elemc = DCTSIZE; elemc > 0; elemc--)
+        *workspaceptr++ = (FAST_FLOAT)
+                          (GETJSAMPLE(*elemptr++) - CENTERJSAMPLE);
+    }
+#endif
+  }
+}
+
+
+METHODDEF(void)
+quantize_float (JCOEFPTR coef_block, FAST_FLOAT * divisors, FAST_FLOAT * workspace)
+{
+  register FAST_FLOAT temp;
+  register int i;
+  register JCOEFPTR output_ptr = coef_block;
+
+  for (i = 0; i < DCTSIZE2; i++) {
+    /* Apply the quantization and scaling factor */
+    temp = workspace[i] * divisors[i];
+
+    /* Round to nearest integer.
+     * Since C does not specify the direction of rounding for negative
+     * quotients, we have to force the dividend positive for portability.
+     * The maximum coefficient size is +-16K (for 12-bit data), so this
+     * code should work for either 16-bit or 32-bit ints.
+     */
+    output_ptr[i] = (JCOEF) ((int) (temp + (FAST_FLOAT) 16384.5) - 16384);
+  }
+}
+
+
+METHODDEF(void)
+forward_DCT_float (j_compress_ptr cinfo, jpeg_component_info * compptr,
+		   JSAMPARRAY sample_data, JBLOCKROW coef_blocks,
+		   JDIMENSION start_row, JDIMENSION start_col,
+		   JDIMENSION num_blocks)
+/* This version is used for floating-point DCT implementations. */
+{
+  /* This routine is heavily used, so it's worth coding it tightly. */
+  my_fdct_ptr fdct = (my_fdct_ptr) cinfo->fdct;
+  FAST_FLOAT * divisors = fdct->float_divisors[compptr->quant_tbl_no];
+  FAST_FLOAT * workspace;
+  JDIMENSION bi;
+
+
+  /* Make sure the compiler doesn't look up these every pass */
+  float_DCT_method_ptr do_dct = fdct->float_dct;
+  float_convsamp_method_ptr do_convsamp = fdct->float_convsamp;
+  float_quantize_method_ptr do_quantize = fdct->float_quantize;
+  workspace = fdct->float_workspace;
+
+  sample_data += start_row;	/* fold in the vertical offset once */
+
+  for (bi = 0; bi < num_blocks; bi++, start_col += DCTSIZE) {
+    /* Load data into workspace, applying unsigned->signed conversion */
+    (*do_convsamp) (sample_data, start_col, workspace);
+
+    /* Perform the DCT */
+    (*do_dct) (workspace);
+
+    /* Quantize/descale the coefficients, and store into coef_blocks[] */
+    (*do_quantize) (coef_blocks[bi], divisors, workspace);
+  }
+}
+
+#endif /* DCT_FLOAT_SUPPORTED */
+
+
+/*
+ * Initialize FDCT manager.
+ */
+
+GLOBAL(void)
+jinit_forward_dct (j_compress_ptr cinfo)
+{
+  my_fdct_ptr fdct;
+  int i;
+
+  fdct = (my_fdct_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				SIZEOF(my_fdct_controller));
+  cinfo->fdct = (struct jpeg_forward_dct *) fdct;
+  fdct->pub.start_pass = start_pass_fdctmgr;
+
+  /* First determine the DCT... */
+  switch (cinfo->dct_method) {
+#ifdef DCT_ISLOW_SUPPORTED
+  case JDCT_ISLOW:
+    fdct->pub.forward_DCT = forward_DCT;
+    if (jsimd_can_fdct_islow())
+      fdct->dct = jsimd_fdct_islow;
+    else
+      fdct->dct = jpeg_fdct_islow;
+    break;
+#endif
+#ifdef DCT_IFAST_SUPPORTED
+  case JDCT_IFAST:
+    fdct->pub.forward_DCT = forward_DCT;
+    if (jsimd_can_fdct_ifast())
+      fdct->dct = jsimd_fdct_ifast;
+    else
+      fdct->dct = jpeg_fdct_ifast;
+    break;
+#endif
+#ifdef DCT_FLOAT_SUPPORTED
+  case JDCT_FLOAT:
+    fdct->pub.forward_DCT = forward_DCT_float;
+    if (jsimd_can_fdct_float())
+      fdct->float_dct = jsimd_fdct_float;
+    else
+      fdct->float_dct = jpeg_fdct_float;
+    break;
+#endif
+  default:
+    ERREXIT(cinfo, JERR_NOT_COMPILED);
+    break;
+  }
+
+  /* ...then the supporting stages. */
+  switch (cinfo->dct_method) {
+#ifdef DCT_ISLOW_SUPPORTED
+  case JDCT_ISLOW:
+#endif
+#ifdef DCT_IFAST_SUPPORTED
+  case JDCT_IFAST:
+#endif
+#if defined(DCT_ISLOW_SUPPORTED) || defined(DCT_IFAST_SUPPORTED)
+    if (jsimd_can_convsamp())
+      fdct->convsamp = jsimd_convsamp;
+    else
+      fdct->convsamp = convsamp;
+    if (jsimd_can_quantize())
+      fdct->quantize = jsimd_quantize;
+    else
+      fdct->quantize = quantize;
+    break;
+#endif
+#ifdef DCT_FLOAT_SUPPORTED
+  case JDCT_FLOAT:
+    if (jsimd_can_convsamp_float())
+      fdct->float_convsamp = jsimd_convsamp_float;
+    else
+      fdct->float_convsamp = convsamp_float;
+    if (jsimd_can_quantize_float())
+      fdct->float_quantize = jsimd_quantize_float;
+    else
+      fdct->float_quantize = quantize_float;
+    break;
+#endif
+  default:
+    ERREXIT(cinfo, JERR_NOT_COMPILED);
+    break;
+  }
+
+  /* Allocate workspace memory */
+#ifdef DCT_FLOAT_SUPPORTED
+  if (cinfo->dct_method == JDCT_FLOAT)
+    fdct->float_workspace = (FAST_FLOAT *)
+      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				  SIZEOF(FAST_FLOAT) * DCTSIZE2);
+  else
+#endif
+    fdct->workspace = (DCTELEM *)
+      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				  SIZEOF(DCTELEM) * DCTSIZE2);
+
+  /* Mark divisor tables unallocated */
+  for (i = 0; i < NUM_QUANT_TBLS; i++) {
+    fdct->divisors[i] = NULL;
+#ifdef DCT_FLOAT_SUPPORTED
+    fdct->float_divisors[i] = NULL;
+#endif
+  }
+}
diff --git a/src/libjpeg-turbo/jchuff.c b/src/libjpeg-turbo/jchuff.c
new file mode 100644
index 0000000..fd4fa46
--- /dev/null
+++ b/src/libjpeg-turbo/jchuff.c
@@ -0,0 +1,1026 @@
+/*
+ * jchuff.c
+ *
+ * Copyright (C) 1991-1997, Thomas G. Lane.
+ * Copyright (C) 2009-2011, D. R. Commander.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains Huffman entropy encoding routines.
+ *
+ * Much of the complexity here has to do with supporting output suspension.
+ * If the data destination module demands suspension, we want to be able to
+ * back up to the start of the current MCU.  To do this, we copy state
+ * variables into local working storage, and update them back to the
+ * permanent JPEG objects only upon successful completion of an MCU.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jchuff.h"		/* Declarations shared with jcphuff.c */
+#include <limits.h>
+
+static unsigned char jpeg_nbits_table[65536];
+static int jpeg_nbits_table_init = 0;
+
+#ifndef min
+ #define min(a,b) ((a)<(b)?(a):(b))
+#endif
+
+
+/* Expanded entropy encoder object for Huffman encoding.
+ *
+ * The savable_state subrecord contains fields that change within an MCU,
+ * but must not be updated permanently until we complete the MCU.
+ */
+
+typedef struct {
+  size_t put_buffer;		/* current bit-accumulation buffer */
+  int put_bits;			/* # of bits now in it */
+  int last_dc_val[MAX_COMPS_IN_SCAN]; /* last DC coef for each component */
+} savable_state;
+
+/* This macro is to work around compilers with missing or broken
+ * structure assignment.  You'll need to fix this code if you have
+ * such a compiler and you change MAX_COMPS_IN_SCAN.
+ */
+
+#ifndef NO_STRUCT_ASSIGN
+#define ASSIGN_STATE(dest,src)  ((dest) = (src))
+#else
+#if MAX_COMPS_IN_SCAN == 4
+#define ASSIGN_STATE(dest,src)  \
+	((dest).put_buffer = (src).put_buffer, \
+	 (dest).put_bits = (src).put_bits, \
+	 (dest).last_dc_val[0] = (src).last_dc_val[0], \
+	 (dest).last_dc_val[1] = (src).last_dc_val[1], \
+	 (dest).last_dc_val[2] = (src).last_dc_val[2], \
+	 (dest).last_dc_val[3] = (src).last_dc_val[3])
+#endif
+#endif
+
+
+typedef struct {
+  struct jpeg_entropy_encoder pub; /* public fields */
+
+  savable_state saved;		/* Bit buffer & DC state at start of MCU */
+
+  /* These fields are NOT loaded into local working state. */
+  unsigned int restarts_to_go;	/* MCUs left in this restart interval */
+  int next_restart_num;		/* next restart number to write (0-7) */
+
+  /* Pointers to derived tables (these workspaces have image lifespan) */
+  c_derived_tbl * dc_derived_tbls[NUM_HUFF_TBLS];
+  c_derived_tbl * ac_derived_tbls[NUM_HUFF_TBLS];
+
+#ifdef ENTROPY_OPT_SUPPORTED	/* Statistics tables for optimization */
+  long * dc_count_ptrs[NUM_HUFF_TBLS];
+  long * ac_count_ptrs[NUM_HUFF_TBLS];
+#endif
+} huff_entropy_encoder;
+
+typedef huff_entropy_encoder * huff_entropy_ptr;
+
+/* Working state while writing an MCU.
+ * This struct contains all the fields that are needed by subroutines.
+ */
+
+typedef struct {
+  JOCTET * next_output_byte;	/* => next byte to write in buffer */
+  size_t free_in_buffer;	/* # of byte spaces remaining in buffer */
+  savable_state cur;		/* Current bit buffer & DC state */
+  j_compress_ptr cinfo;		/* dump_buffer needs access to this */
+} working_state;
+
+
+/* Forward declarations */
+METHODDEF(boolean) encode_mcu_huff JPP((j_compress_ptr cinfo,
+					JBLOCKROW *MCU_data));
+METHODDEF(void) finish_pass_huff JPP((j_compress_ptr cinfo));
+#ifdef ENTROPY_OPT_SUPPORTED
+METHODDEF(boolean) encode_mcu_gather JPP((j_compress_ptr cinfo,
+					  JBLOCKROW *MCU_data));
+METHODDEF(void) finish_pass_gather JPP((j_compress_ptr cinfo));
+#endif
+
+
+/*
+ * Initialize for a Huffman-compressed scan.
+ * If gather_statistics is TRUE, we do not output anything during the scan,
+ * just count the Huffman symbols used and generate Huffman code tables.
+ */
+
+METHODDEF(void)
+start_pass_huff (j_compress_ptr cinfo, boolean gather_statistics)
+{
+  huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy;
+  int ci, dctbl, actbl;
+  jpeg_component_info * compptr;
+
+  if (gather_statistics) {
+#ifdef ENTROPY_OPT_SUPPORTED
+    entropy->pub.encode_mcu = encode_mcu_gather;
+    entropy->pub.finish_pass = finish_pass_gather;
+#else
+    ERREXIT(cinfo, JERR_NOT_COMPILED);
+#endif
+  } else {
+    entropy->pub.encode_mcu = encode_mcu_huff;
+    entropy->pub.finish_pass = finish_pass_huff;
+  }
+
+  for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
+    compptr = cinfo->cur_comp_info[ci];
+    dctbl = compptr->dc_tbl_no;
+    actbl = compptr->ac_tbl_no;
+    if (gather_statistics) {
+#ifdef ENTROPY_OPT_SUPPORTED
+      /* Check for invalid table indexes */
+      /* (make_c_derived_tbl does this in the other path) */
+      if (dctbl < 0 || dctbl >= NUM_HUFF_TBLS)
+	ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, dctbl);
+      if (actbl < 0 || actbl >= NUM_HUFF_TBLS)
+	ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, actbl);
+      /* Allocate and zero the statistics tables */
+      /* Note that jpeg_gen_optimal_table expects 257 entries in each table! */
+      if (entropy->dc_count_ptrs[dctbl] == NULL)
+	entropy->dc_count_ptrs[dctbl] = (long *)
+	  (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				      257 * SIZEOF(long));
+      MEMZERO(entropy->dc_count_ptrs[dctbl], 257 * SIZEOF(long));
+      if (entropy->ac_count_ptrs[actbl] == NULL)
+	entropy->ac_count_ptrs[actbl] = (long *)
+	  (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				      257 * SIZEOF(long));
+      MEMZERO(entropy->ac_count_ptrs[actbl], 257 * SIZEOF(long));
+#endif
+    } else {
+      /* Compute derived values for Huffman tables */
+      /* We may do this more than once for a table, but it's not expensive */
+      jpeg_make_c_derived_tbl(cinfo, TRUE, dctbl,
+			      & entropy->dc_derived_tbls[dctbl]);
+      jpeg_make_c_derived_tbl(cinfo, FALSE, actbl,
+			      & entropy->ac_derived_tbls[actbl]);
+    }
+    /* Initialize DC predictions to 0 */
+    entropy->saved.last_dc_val[ci] = 0;
+  }
+
+  /* Initialize bit buffer to empty */
+  entropy->saved.put_buffer = 0;
+  entropy->saved.put_bits = 0;
+
+  /* Initialize restart stuff */
+  entropy->restarts_to_go = cinfo->restart_interval;
+  entropy->next_restart_num = 0;
+}
+
+
+/*
+ * Compute the derived values for a Huffman table.
+ * This routine also performs some validation checks on the table.
+ *
+ * Note this is also used by jcphuff.c.
+ */
+
+GLOBAL(void)
+jpeg_make_c_derived_tbl (j_compress_ptr cinfo, boolean isDC, int tblno,
+			 c_derived_tbl ** pdtbl)
+{
+  JHUFF_TBL *htbl;
+  c_derived_tbl *dtbl;
+  int p, i, l, lastp, si, maxsymbol;
+  char huffsize[257];
+  unsigned int huffcode[257];
+  unsigned int code;
+
+  /* Note that huffsize[] and huffcode[] are filled in code-length order,
+   * paralleling the order of the symbols themselves in htbl->huffval[].
+   */
+
+  /* Find the input Huffman table */
+  if (tblno < 0 || tblno >= NUM_HUFF_TBLS)
+    ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, tblno);
+  htbl =
+    isDC ? cinfo->dc_huff_tbl_ptrs[tblno] : cinfo->ac_huff_tbl_ptrs[tblno];
+  if (htbl == NULL)
+    ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, tblno);
+
+  /* Allocate a workspace if we haven't already done so. */
+  if (*pdtbl == NULL)
+    *pdtbl = (c_derived_tbl *)
+      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				  SIZEOF(c_derived_tbl));
+  dtbl = *pdtbl;
+  
+  /* Figure C.1: make table of Huffman code length for each symbol */
+
+  p = 0;
+  for (l = 1; l <= 16; l++) {
+    i = (int) htbl->bits[l];
+    if (i < 0 || p + i > 256)	/* protect against table overrun */
+      ERREXIT(cinfo, JERR_BAD_HUFF_TABLE);
+    while (i--)
+      huffsize[p++] = (char) l;
+  }
+  huffsize[p] = 0;
+  lastp = p;
+  
+  /* Figure C.2: generate the codes themselves */
+  /* We also validate that the counts represent a legal Huffman code tree. */
+
+  code = 0;
+  si = huffsize[0];
+  p = 0;
+  while (huffsize[p]) {
+    while (((int) huffsize[p]) == si) {
+      huffcode[p++] = code;
+      code++;
+    }
+    /* code is now 1 more than the last code used for codelength si; but
+     * it must still fit in si bits, since no code is allowed to be all ones.
+     */
+    if (((INT32) code) >= (((INT32) 1) << si))
+      ERREXIT(cinfo, JERR_BAD_HUFF_TABLE);
+    code <<= 1;
+    si++;
+  }
+  
+  /* Figure C.3: generate encoding tables */
+  /* These are code and size indexed by symbol value */
+
+  /* Set all codeless symbols to have code length 0;
+   * this lets us detect duplicate VAL entries here, and later
+   * allows emit_bits to detect any attempt to emit such symbols.
+   */
+  MEMZERO(dtbl->ehufsi, SIZEOF(dtbl->ehufsi));
+
+  /* This is also a convenient place to check for out-of-range
+   * and duplicated VAL entries.  We allow 0..255 for AC symbols
+   * but only 0..15 for DC.  (We could constrain them further
+   * based on data depth and mode, but this seems enough.)
+   */
+  maxsymbol = isDC ? 15 : 255;
+
+  for (p = 0; p < lastp; p++) {
+    i = htbl->huffval[p];
+    if (i < 0 || i > maxsymbol || dtbl->ehufsi[i])
+      ERREXIT(cinfo, JERR_BAD_HUFF_TABLE);
+    dtbl->ehufco[i] = huffcode[p];
+    dtbl->ehufsi[i] = huffsize[p];
+  }
+
+  if(!jpeg_nbits_table_init) {
+    for(i = 0; i < 65536; i++) {
+      int nbits = 0, temp = i;
+      while (temp) {temp >>= 1;  nbits++;}
+      jpeg_nbits_table[i] = nbits;
+    }
+    jpeg_nbits_table_init = 1;
+  }
+}
+
+
+/* Outputting bytes to the file */
+
+/* Emit a byte, taking 'action' if must suspend. */
+#define emit_byte(state,val,action)  \
+	{ *(state)->next_output_byte++ = (JOCTET) (val);  \
+	  if (--(state)->free_in_buffer == 0)  \
+	    if (! dump_buffer(state))  \
+	      { action; } }
+
+
+LOCAL(boolean)
+dump_buffer (working_state * state)
+/* Empty the output buffer; return TRUE if successful, FALSE if must suspend */
+{
+  struct jpeg_destination_mgr * dest = state->cinfo->dest;
+
+  dest->free_in_buffer = state->free_in_buffer;
+
+  if (! (*dest->empty_output_buffer) (state->cinfo))
+    return FALSE;
+  /* After a successful buffer dump, must reset buffer pointers */
+  state->next_output_byte = dest->next_output_byte;
+  state->free_in_buffer = dest->free_in_buffer;
+  return TRUE;
+}
+
+
+/* Outputting bits to the file */
+
+/* These macros perform the same task as the emit_bits() function in the
+ * original libjpeg code.  In addition to reducing overhead by explicitly
+ * inlining the code, additional performance is achieved by taking into
+ * account the size of the bit buffer and waiting until it is almost full
+ * before emptying it.  This mostly benefits 64-bit platforms, since 6
+ * bytes can be stored in a 64-bit bit buffer before it has to be emptied.
+ */
+
+#define EMIT_BYTE() { \
+  JOCTET c; \
+  put_bits -= 8; \
+  c = (JOCTET)GETJOCTET(put_buffer >> put_bits); \
+  *buffer++ = c; \
+  if (c == 0xFF)  /* need to stuff a zero byte? */ \
+    *buffer++ = 0; \
+ }
+
+#define PUT_BITS(code, size) { \
+  put_bits += size; \
+  put_buffer = (put_buffer << size) | code; \
+}
+
+#define CHECKBUF15() { \
+  if (put_bits > 15) { \
+    EMIT_BYTE() \
+    EMIT_BYTE() \
+  } \
+}
+
+#define CHECKBUF31() { \
+  if (put_bits > 31) { \
+    EMIT_BYTE() \
+    EMIT_BYTE() \
+    EMIT_BYTE() \
+    EMIT_BYTE() \
+  } \
+}
+
+#define CHECKBUF47() { \
+  if (put_bits > 47) { \
+    EMIT_BYTE() \
+    EMIT_BYTE() \
+    EMIT_BYTE() \
+    EMIT_BYTE() \
+    EMIT_BYTE() \
+    EMIT_BYTE() \
+  } \
+}
+
+#if __WORDSIZE==64 || defined(_WIN64)
+
+#define EMIT_BITS(code, size) { \
+  CHECKBUF47() \
+  PUT_BITS(code, size) \
+}
+
+#define EMIT_CODE(code, size) { \
+  temp2 &= (((INT32) 1)<<nbits) - 1; \
+  CHECKBUF31() \
+  PUT_BITS(code, size) \
+  PUT_BITS(temp2, nbits) \
+ }
+
+#else
+
+#define EMIT_BITS(code, size) { \
+  PUT_BITS(code, size) \
+  CHECKBUF15() \
+}
+
+#define EMIT_CODE(code, size) { \
+  temp2 &= (((INT32) 1)<<nbits) - 1; \
+  PUT_BITS(code, size) \
+  CHECKBUF15() \
+  PUT_BITS(temp2, nbits) \
+  CHECKBUF15() \
+ }
+
+#endif
+
+
+#define BUFSIZE (DCTSIZE2 * 2)
+
+#define LOAD_BUFFER() { \
+  if (state->free_in_buffer < BUFSIZE) { \
+    localbuf = 1; \
+    buffer = _buffer; \
+  } \
+  else buffer = state->next_output_byte; \
+ }
+
+#define STORE_BUFFER() { \
+  if (localbuf) { \
+    bytes = buffer - _buffer; \
+    buffer = _buffer; \
+    while (bytes > 0) { \
+      bytestocopy = min(bytes, state->free_in_buffer); \
+      MEMCOPY(state->next_output_byte, buffer, bytestocopy); \
+      state->next_output_byte += bytestocopy; \
+      buffer += bytestocopy; \
+      state->free_in_buffer -= bytestocopy; \
+      if (state->free_in_buffer == 0) \
+        if (! dump_buffer(state)) return FALSE; \
+      bytes -= bytestocopy; \
+    } \
+  } \
+  else { \
+    state->free_in_buffer -= (buffer - state->next_output_byte); \
+    state->next_output_byte = buffer; \
+  } \
+ }
+
+
+LOCAL(boolean)
+flush_bits (working_state * state)
+{
+  JOCTET _buffer[BUFSIZE], *buffer;
+  size_t put_buffer;  int put_bits;
+  size_t bytes, bytestocopy;  int localbuf = 0;
+
+  put_buffer = state->cur.put_buffer;
+  put_bits = state->cur.put_bits;
+  LOAD_BUFFER()
+
+  /* fill any partial byte with ones */
+  PUT_BITS(0x7F, 7)
+  while (put_bits >= 8) EMIT_BYTE()
+
+  state->cur.put_buffer = 0;	/* and reset bit-buffer to empty */
+  state->cur.put_bits = 0;
+  STORE_BUFFER()
+
+  return TRUE;
+}
+
+
+/* Encode a single block's worth of coefficients */
+
+LOCAL(boolean)
+encode_one_block (working_state * state, JCOEFPTR block, int last_dc_val,
+		  c_derived_tbl *dctbl, c_derived_tbl *actbl)
+{
+  int temp, temp2, temp3;
+  int nbits;
+  int r, code, size;
+  JOCTET _buffer[BUFSIZE], *buffer;
+  size_t put_buffer;  int put_bits;
+  int code_0xf0 = actbl->ehufco[0xf0], size_0xf0 = actbl->ehufsi[0xf0];
+  size_t bytes, bytestocopy;  int localbuf = 0;
+
+  put_buffer = state->cur.put_buffer;
+  put_bits = state->cur.put_bits;
+  LOAD_BUFFER()
+
+  /* Encode the DC coefficient difference per section F.1.2.1 */
+  
+  temp = temp2 = block[0] - last_dc_val;
+
+ /* This is a well-known technique for obtaining the absolute value without a
+  * branch.  It is derived from an assembly language technique presented in
+  * "How to Optimize for the Pentium Processors", Copyright (c) 1996, 1997 by
+  * Agner Fog.
+  */
+  temp3 = temp >> (CHAR_BIT * sizeof(int) - 1);
+  temp ^= temp3;
+  temp -= temp3;
+
+  /* For a negative input, want temp2 = bitwise complement of abs(input) */
+  /* This code assumes we are on a two's complement machine */
+  temp2 += temp3;
+
+  /* Find the number of bits needed for the magnitude of the coefficient */
+  nbits = jpeg_nbits_table[temp];
+
+  /* Emit the Huffman-coded symbol for the number of bits */
+  code = dctbl->ehufco[nbits];
+  size = dctbl->ehufsi[nbits];
+  PUT_BITS(code, size)
+  CHECKBUF15()
+
+  /* Mask off any extra bits in code */
+  temp2 &= (((INT32) 1)<<nbits) - 1;
+
+  /* Emit that number of bits of the value, if positive, */
+  /* or the complement of its magnitude, if negative. */
+  PUT_BITS(temp2, nbits)
+  CHECKBUF15()
+
+  /* Encode the AC coefficients per section F.1.2.2 */
+  
+  r = 0;			/* r = run length of zeros */
+
+/* Manually unroll the k loop to eliminate the counter variable.  This
+ * improves performance greatly on systems with a limited number of
+ * registers (such as x86.)
+ */
+#define kloop(jpeg_natural_order_of_k) {  \
+  if ((temp = block[jpeg_natural_order_of_k]) == 0) { \
+    r++; \
+  } else { \
+    temp2 = temp; \
+    /* Branch-less absolute value, bitwise complement, etc., same as above */ \
+    temp3 = temp >> (CHAR_BIT * sizeof(int) - 1); \
+    temp ^= temp3; \
+    temp -= temp3; \
+    temp2 += temp3; \
+    nbits = jpeg_nbits_table[temp]; \
+    /* if run length > 15, must emit special run-length-16 codes (0xF0) */ \
+    while (r > 15) { \
+      EMIT_BITS(code_0xf0, size_0xf0) \
+      r -= 16; \
+    } \
+    /* Emit Huffman symbol for run length / number of bits */ \
+    temp3 = (r << 4) + nbits;  \
+    code = actbl->ehufco[temp3]; \
+    size = actbl->ehufsi[temp3]; \
+    EMIT_CODE(code, size) \
+    r = 0;  \
+  } \
+}
+
+  /* One iteration for each value in jpeg_natural_order[] */
+  kloop(1);   kloop(8);   kloop(16);  kloop(9);   kloop(2);   kloop(3);
+  kloop(10);  kloop(17);  kloop(24);  kloop(32);  kloop(25);  kloop(18);
+  kloop(11);  kloop(4);   kloop(5);   kloop(12);  kloop(19);  kloop(26);
+  kloop(33);  kloop(40);  kloop(48);  kloop(41);  kloop(34);  kloop(27);
+  kloop(20);  kloop(13);  kloop(6);   kloop(7);   kloop(14);  kloop(21);
+  kloop(28);  kloop(35);  kloop(42);  kloop(49);  kloop(56);  kloop(57);
+  kloop(50);  kloop(43);  kloop(36);  kloop(29);  kloop(22);  kloop(15);
+  kloop(23);  kloop(30);  kloop(37);  kloop(44);  kloop(51);  kloop(58);
+  kloop(59);  kloop(52);  kloop(45);  kloop(38);  kloop(31);  kloop(39);
+  kloop(46);  kloop(53);  kloop(60);  kloop(61);  kloop(54);  kloop(47);
+  kloop(55);  kloop(62);  kloop(63);
+
+  /* If the last coef(s) were zero, emit an end-of-block code */
+  if (r > 0) {
+    code = actbl->ehufco[0];
+    size = actbl->ehufsi[0];
+    EMIT_BITS(code, size)
+  }
+
+  state->cur.put_buffer = put_buffer;
+  state->cur.put_bits = put_bits;
+  STORE_BUFFER()
+
+  return TRUE;
+}
+
+
+/*
+ * Emit a restart marker & resynchronize predictions.
+ */
+
+LOCAL(boolean)
+emit_restart (working_state * state, int restart_num)
+{
+  int ci;
+
+  if (! flush_bits(state))
+    return FALSE;
+
+  emit_byte(state, 0xFF, return FALSE);
+  emit_byte(state, JPEG_RST0 + restart_num, return FALSE);
+
+  /* Re-initialize DC predictions to 0 */
+  for (ci = 0; ci < state->cinfo->comps_in_scan; ci++)
+    state->cur.last_dc_val[ci] = 0;
+
+  /* The restart counter is not updated until we successfully write the MCU. */
+
+  return TRUE;
+}
+
+
+/*
+ * Encode and output one MCU's worth of Huffman-compressed coefficients.
+ */
+
+METHODDEF(boolean)
+encode_mcu_huff (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
+{
+  huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy;
+  working_state state;
+  int blkn, ci;
+  jpeg_component_info * compptr;
+
+  /* Load up working state */
+  state.next_output_byte = cinfo->dest->next_output_byte;
+  state.free_in_buffer = cinfo->dest->free_in_buffer;
+  ASSIGN_STATE(state.cur, entropy->saved);
+  state.cinfo = cinfo;
+
+  /* Emit restart marker if needed */
+  if (cinfo->restart_interval) {
+    if (entropy->restarts_to_go == 0)
+      if (! emit_restart(&state, entropy->next_restart_num))
+	return FALSE;
+  }
+
+  /* Encode the MCU data blocks */
+  for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
+    ci = cinfo->MCU_membership[blkn];
+    compptr = cinfo->cur_comp_info[ci];
+    if (! encode_one_block(&state,
+			   MCU_data[blkn][0], state.cur.last_dc_val[ci],
+			   entropy->dc_derived_tbls[compptr->dc_tbl_no],
+			   entropy->ac_derived_tbls[compptr->ac_tbl_no]))
+      return FALSE;
+    /* Update last_dc_val */
+    state.cur.last_dc_val[ci] = MCU_data[blkn][0][0];
+  }
+
+  /* Completed MCU, so update state */
+  cinfo->dest->next_output_byte = state.next_output_byte;
+  cinfo->dest->free_in_buffer = state.free_in_buffer;
+  ASSIGN_STATE(entropy->saved, state.cur);
+
+  /* Update restart-interval state too */
+  if (cinfo->restart_interval) {
+    if (entropy->restarts_to_go == 0) {
+      entropy->restarts_to_go = cinfo->restart_interval;
+      entropy->next_restart_num++;
+      entropy->next_restart_num &= 7;
+    }
+    entropy->restarts_to_go--;
+  }
+
+  return TRUE;
+}
+
+
+/*
+ * Finish up at the end of a Huffman-compressed scan.
+ */
+
+METHODDEF(void)
+finish_pass_huff (j_compress_ptr cinfo)
+{
+  huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy;
+  working_state state;
+
+  /* Load up working state ... flush_bits needs it */
+  state.next_output_byte = cinfo->dest->next_output_byte;
+  state.free_in_buffer = cinfo->dest->free_in_buffer;
+  ASSIGN_STATE(state.cur, entropy->saved);
+  state.cinfo = cinfo;
+
+  /* Flush out the last data */
+  if (! flush_bits(&state))
+    ERREXIT(cinfo, JERR_CANT_SUSPEND);
+
+  /* Update state */
+  cinfo->dest->next_output_byte = state.next_output_byte;
+  cinfo->dest->free_in_buffer = state.free_in_buffer;
+  ASSIGN_STATE(entropy->saved, state.cur);
+}
+
+
+/*
+ * Huffman coding optimization.
+ *
+ * We first scan the supplied data and count the number of uses of each symbol
+ * that is to be Huffman-coded. (This process MUST agree with the code above.)
+ * Then we build a Huffman coding tree for the observed counts.
+ * Symbols which are not needed at all for the particular image are not
+ * assigned any code, which saves space in the DHT marker as well as in
+ * the compressed data.
+ */
+
+#ifdef ENTROPY_OPT_SUPPORTED
+
+
+/* Process a single block's worth of coefficients */
+
+LOCAL(void)
+htest_one_block (j_compress_ptr cinfo, JCOEFPTR block, int last_dc_val,
+		 long dc_counts[], long ac_counts[])
+{
+  register int temp;
+  register int nbits;
+  register int k, r;
+  
+  /* Encode the DC coefficient difference per section F.1.2.1 */
+  
+  temp = block[0] - last_dc_val;
+  if (temp < 0)
+    temp = -temp;
+  
+  /* Find the number of bits needed for the magnitude of the coefficient */
+  nbits = 0;
+  while (temp) {
+    nbits++;
+    temp >>= 1;
+  }
+  /* Check for out-of-range coefficient values.
+   * Since we're encoding a difference, the range limit is twice as much.
+   */
+  if (nbits > MAX_COEF_BITS+1)
+    ERREXIT(cinfo, JERR_BAD_DCT_COEF);
+
+  /* Count the Huffman symbol for the number of bits */
+  dc_counts[nbits]++;
+  
+  /* Encode the AC coefficients per section F.1.2.2 */
+  
+  r = 0;			/* r = run length of zeros */
+  
+  for (k = 1; k < DCTSIZE2; k++) {
+    if ((temp = block[jpeg_natural_order[k]]) == 0) {
+      r++;
+    } else {
+      /* if run length > 15, must emit special run-length-16 codes (0xF0) */
+      while (r > 15) {
+	ac_counts[0xF0]++;
+	r -= 16;
+      }
+      
+      /* Find the number of bits needed for the magnitude of the coefficient */
+      if (temp < 0)
+	temp = -temp;
+      
+      /* Find the number of bits needed for the magnitude of the coefficient */
+      nbits = 1;		/* there must be at least one 1 bit */
+      while ((temp >>= 1))
+	nbits++;
+      /* Check for out-of-range coefficient values */
+      if (nbits > MAX_COEF_BITS)
+	ERREXIT(cinfo, JERR_BAD_DCT_COEF);
+      
+      /* Count Huffman symbol for run length / number of bits */
+      ac_counts[(r << 4) + nbits]++;
+      
+      r = 0;
+    }
+  }
+
+  /* If the last coef(s) were zero, emit an end-of-block code */
+  if (r > 0)
+    ac_counts[0]++;
+}
+
+
+/*
+ * Trial-encode one MCU's worth of Huffman-compressed coefficients.
+ * No data is actually output, so no suspension return is possible.
+ */
+
+METHODDEF(boolean)
+encode_mcu_gather (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
+{
+  huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy;
+  int blkn, ci;
+  jpeg_component_info * compptr;
+
+  /* Take care of restart intervals if needed */
+  if (cinfo->restart_interval) {
+    if (entropy->restarts_to_go == 0) {
+      /* Re-initialize DC predictions to 0 */
+      for (ci = 0; ci < cinfo->comps_in_scan; ci++)
+	entropy->saved.last_dc_val[ci] = 0;
+      /* Update restart state */
+      entropy->restarts_to_go = cinfo->restart_interval;
+    }
+    entropy->restarts_to_go--;
+  }
+
+  for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
+    ci = cinfo->MCU_membership[blkn];
+    compptr = cinfo->cur_comp_info[ci];
+    htest_one_block(cinfo, MCU_data[blkn][0], entropy->saved.last_dc_val[ci],
+		    entropy->dc_count_ptrs[compptr->dc_tbl_no],
+		    entropy->ac_count_ptrs[compptr->ac_tbl_no]);
+    entropy->saved.last_dc_val[ci] = MCU_data[blkn][0][0];
+  }
+
+  return TRUE;
+}
+
+
+/*
+ * Generate the best Huffman code table for the given counts, fill htbl.
+ * Note this is also used by jcphuff.c.
+ *
+ * The JPEG standard requires that no symbol be assigned a codeword of all
+ * one bits (so that padding bits added at the end of a compressed segment
+ * can't look like a valid code).  Because of the canonical ordering of
+ * codewords, this just means that there must be an unused slot in the
+ * longest codeword length category.  Section K.2 of the JPEG spec suggests
+ * reserving such a slot by pretending that symbol 256 is a valid symbol
+ * with count 1.  In theory that's not optimal; giving it count zero but
+ * including it in the symbol set anyway should give a better Huffman code.
+ * But the theoretically better code actually seems to come out worse in
+ * practice, because it produces more all-ones bytes (which incur stuffed
+ * zero bytes in the final file).  In any case the difference is tiny.
+ *
+ * The JPEG standard requires Huffman codes to be no more than 16 bits long.
+ * If some symbols have a very small but nonzero probability, the Huffman tree
+ * must be adjusted to meet the code length restriction.  We currently use
+ * the adjustment method suggested in JPEG section K.2.  This method is *not*
+ * optimal; it may not choose the best possible limited-length code.  But
+ * typically only very-low-frequency symbols will be given less-than-optimal
+ * lengths, so the code is almost optimal.  Experimental comparisons against
+ * an optimal limited-length-code algorithm indicate that the difference is
+ * microscopic --- usually less than a hundredth of a percent of total size.
+ * So the extra complexity of an optimal algorithm doesn't seem worthwhile.
+ */
+
+GLOBAL(void)
+jpeg_gen_optimal_table (j_compress_ptr cinfo, JHUFF_TBL * htbl, long freq[])
+{
+#define MAX_CLEN 32		/* assumed maximum initial code length */
+  UINT8 bits[MAX_CLEN+1];	/* bits[k] = # of symbols with code length k */
+  int codesize[257];		/* codesize[k] = code length of symbol k */
+  int others[257];		/* next symbol in current branch of tree */
+  int c1, c2;
+  int p, i, j;
+  long v;
+
+  /* This algorithm is explained in section K.2 of the JPEG standard */
+
+  MEMZERO(bits, SIZEOF(bits));
+  MEMZERO(codesize, SIZEOF(codesize));
+  for (i = 0; i < 257; i++)
+    others[i] = -1;		/* init links to empty */
+  
+  freq[256] = 1;		/* make sure 256 has a nonzero count */
+  /* Including the pseudo-symbol 256 in the Huffman procedure guarantees
+   * that no real symbol is given code-value of all ones, because 256
+   * will be placed last in the largest codeword category.
+   */
+
+  /* Huffman's basic algorithm to assign optimal code lengths to symbols */
+
+  for (;;) {
+    /* Find the smallest nonzero frequency, set c1 = its symbol */
+    /* In case of ties, take the larger symbol number */
+    c1 = -1;
+    v = 1000000000L;
+    for (i = 0; i <= 256; i++) {
+      if (freq[i] && freq[i] <= v) {
+	v = freq[i];
+	c1 = i;
+      }
+    }
+
+    /* Find the next smallest nonzero frequency, set c2 = its symbol */
+    /* In case of ties, take the larger symbol number */
+    c2 = -1;
+    v = 1000000000L;
+    for (i = 0; i <= 256; i++) {
+      if (freq[i] && freq[i] <= v && i != c1) {
+	v = freq[i];
+	c2 = i;
+      }
+    }
+
+    /* Done if we've merged everything into one frequency */
+    if (c2 < 0)
+      break;
+    
+    /* Else merge the two counts/trees */
+    freq[c1] += freq[c2];
+    freq[c2] = 0;
+
+    /* Increment the codesize of everything in c1's tree branch */
+    codesize[c1]++;
+    while (others[c1] >= 0) {
+      c1 = others[c1];
+      codesize[c1]++;
+    }
+    
+    others[c1] = c2;		/* chain c2 onto c1's tree branch */
+    
+    /* Increment the codesize of everything in c2's tree branch */
+    codesize[c2]++;
+    while (others[c2] >= 0) {
+      c2 = others[c2];
+      codesize[c2]++;
+    }
+  }
+
+  /* Now count the number of symbols of each code length */
+  for (i = 0; i <= 256; i++) {
+    if (codesize[i]) {
+      /* The JPEG standard seems to think that this can't happen, */
+      /* but I'm paranoid... */
+      if (codesize[i] > MAX_CLEN)
+	ERREXIT(cinfo, JERR_HUFF_CLEN_OVERFLOW);
+
+      bits[codesize[i]]++;
+    }
+  }
+
+  /* JPEG doesn't allow symbols with code lengths over 16 bits, so if the pure
+   * Huffman procedure assigned any such lengths, we must adjust the coding.
+   * Here is what the JPEG spec says about how this next bit works:
+   * Since symbols are paired for the longest Huffman code, the symbols are
+   * removed from this length category two at a time.  The prefix for the pair
+   * (which is one bit shorter) is allocated to one of the pair; then,
+   * skipping the BITS entry for that prefix length, a code word from the next
+   * shortest nonzero BITS entry is converted into a prefix for two code words
+   * one bit longer.
+   */
+  
+  for (i = MAX_CLEN; i > 16; i--) {
+    while (bits[i] > 0) {
+      j = i - 2;		/* find length of new prefix to be used */
+      while (bits[j] == 0)
+	j--;
+      
+      bits[i] -= 2;		/* remove two symbols */
+      bits[i-1]++;		/* one goes in this length */
+      bits[j+1] += 2;		/* two new symbols in this length */
+      bits[j]--;		/* symbol of this length is now a prefix */
+    }
+  }
+
+  /* Remove the count for the pseudo-symbol 256 from the largest codelength */
+  while (bits[i] == 0)		/* find largest codelength still in use */
+    i--;
+  bits[i]--;
+  
+  /* Return final symbol counts (only for lengths 0..16) */
+  MEMCOPY(htbl->bits, bits, SIZEOF(htbl->bits));
+  
+  /* Return a list of the symbols sorted by code length */
+  /* It's not real clear to me why we don't need to consider the codelength
+   * changes made above, but the JPEG spec seems to think this works.
+   */
+  p = 0;
+  for (i = 1; i <= MAX_CLEN; i++) {
+    for (j = 0; j <= 255; j++) {
+      if (codesize[j] == i) {
+	htbl->huffval[p] = (UINT8) j;
+	p++;
+      }
+    }
+  }
+
+  /* Set sent_table FALSE so updated table will be written to JPEG file. */
+  htbl->sent_table = FALSE;
+}
+
+
+/*
+ * Finish up a statistics-gathering pass and create the new Huffman tables.
+ */
+
+METHODDEF(void)
+finish_pass_gather (j_compress_ptr cinfo)
+{
+  huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy;
+  int ci, dctbl, actbl;
+  jpeg_component_info * compptr;
+  JHUFF_TBL **htblptr;
+  boolean did_dc[NUM_HUFF_TBLS];
+  boolean did_ac[NUM_HUFF_TBLS];
+
+  /* It's important not to apply jpeg_gen_optimal_table more than once
+   * per table, because it clobbers the input frequency counts!
+   */
+  MEMZERO(did_dc, SIZEOF(did_dc));
+  MEMZERO(did_ac, SIZEOF(did_ac));
+
+  for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
+    compptr = cinfo->cur_comp_info[ci];
+    dctbl = compptr->dc_tbl_no;
+    actbl = compptr->ac_tbl_no;
+    if (! did_dc[dctbl]) {
+      htblptr = & cinfo->dc_huff_tbl_ptrs[dctbl];
+      if (*htblptr == NULL)
+	*htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo);
+      jpeg_gen_optimal_table(cinfo, *htblptr, entropy->dc_count_ptrs[dctbl]);
+      did_dc[dctbl] = TRUE;
+    }
+    if (! did_ac[actbl]) {
+      htblptr = & cinfo->ac_huff_tbl_ptrs[actbl];
+      if (*htblptr == NULL)
+	*htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo);
+      jpeg_gen_optimal_table(cinfo, *htblptr, entropy->ac_count_ptrs[actbl]);
+      did_ac[actbl] = TRUE;
+    }
+  }
+}
+
+
+#endif /* ENTROPY_OPT_SUPPORTED */
+
+
+/*
+ * Module initialization routine for Huffman entropy encoding.
+ */
+
+GLOBAL(void)
+jinit_huff_encoder (j_compress_ptr cinfo)
+{
+  huff_entropy_ptr entropy;
+  int i;
+
+  entropy = (huff_entropy_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				SIZEOF(huff_entropy_encoder));
+  cinfo->entropy = (struct jpeg_entropy_encoder *) entropy;
+  entropy->pub.start_pass = start_pass_huff;
+
+  /* Mark tables unallocated */
+  for (i = 0; i < NUM_HUFF_TBLS; i++) {
+    entropy->dc_derived_tbls[i] = entropy->ac_derived_tbls[i] = NULL;
+#ifdef ENTROPY_OPT_SUPPORTED
+    entropy->dc_count_ptrs[i] = entropy->ac_count_ptrs[i] = NULL;
+#endif
+  }
+}
diff --git a/src/libjpeg-turbo/jchuff.h b/src/libjpeg-turbo/jchuff.h
new file mode 100644
index 0000000..a9599fc
--- /dev/null
+++ b/src/libjpeg-turbo/jchuff.h
@@ -0,0 +1,47 @@
+/*
+ * jchuff.h
+ *
+ * Copyright (C) 1991-1997, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains declarations for Huffman entropy encoding routines
+ * that are shared between the sequential encoder (jchuff.c) and the
+ * progressive encoder (jcphuff.c).  No other modules need to see these.
+ */
+
+/* The legal range of a DCT coefficient is
+ *  -1024 .. +1023  for 8-bit data;
+ * -16384 .. +16383 for 12-bit data.
+ * Hence the magnitude should always fit in 10 or 14 bits respectively.
+ */
+
+#if BITS_IN_JSAMPLE == 8
+#define MAX_COEF_BITS 10
+#else
+#define MAX_COEF_BITS 14
+#endif
+
+/* Derived data constructed for each Huffman table */
+
+typedef struct {
+  unsigned int ehufco[256];	/* code for each symbol */
+  char ehufsi[256];		/* length of code for each symbol */
+  /* If no code has been allocated for a symbol S, ehufsi[S] contains 0 */
+} c_derived_tbl;
+
+/* Short forms of external names for systems with brain-damaged linkers. */
+
+#ifdef NEED_SHORT_EXTERNAL_NAMES
+#define jpeg_make_c_derived_tbl	jMkCDerived
+#define jpeg_gen_optimal_table	jGenOptTbl
+#endif /* NEED_SHORT_EXTERNAL_NAMES */
+
+/* Expand a Huffman table definition into the derived format */
+EXTERN(void) jpeg_make_c_derived_tbl
+	JPP((j_compress_ptr cinfo, boolean isDC, int tblno,
+	     c_derived_tbl ** pdtbl));
+
+/* Generate an optimal table definition given the specified counts */
+EXTERN(void) jpeg_gen_optimal_table
+	JPP((j_compress_ptr cinfo, JHUFF_TBL * htbl, long freq[]));
diff --git a/src/libjpeg-turbo/jcinit.c b/src/libjpeg-turbo/jcinit.c
new file mode 100644
index 0000000..de0ade2
--- /dev/null
+++ b/src/libjpeg-turbo/jcinit.c
@@ -0,0 +1,76 @@
+/*
+ * jcinit.c
+ *
+ * Copyright (C) 1991-1997, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains initialization logic for the JPEG compressor.
+ * This routine is in charge of selecting the modules to be executed and
+ * making an initialization call to each one.
+ *
+ * Logically, this code belongs in jcmaster.c.  It's split out because
+ * linking this routine implies linking the entire compression library.
+ * For a transcoding-only application, we want to be able to use jcmaster.c
+ * without linking in the whole library.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+
+
+/*
+ * Master selection of compression modules.
+ * This is done once at the start of processing an image.  We determine
+ * which modules will be used and give them appropriate initialization calls.
+ */
+
+GLOBAL(void)
+jinit_compress_master (j_compress_ptr cinfo)
+{
+  /* Initialize master control (includes parameter checking/processing) */
+  jinit_c_master_control(cinfo, FALSE /* full compression */);
+
+  /* Preprocessing */
+  if (! cinfo->raw_data_in) {
+    jinit_color_converter(cinfo);
+    jinit_downsampler(cinfo);
+    jinit_c_prep_controller(cinfo, FALSE /* never need full buffer here */);
+  }
+  /* Forward DCT */
+  jinit_forward_dct(cinfo);
+  /* Entropy encoding: either Huffman or arithmetic coding. */
+  if (cinfo->arith_code) {
+#ifdef C_ARITH_CODING_SUPPORTED
+    jinit_arith_encoder(cinfo);
+#else
+    ERREXIT(cinfo, JERR_ARITH_NOTIMPL);
+#endif
+  } else {
+    if (cinfo->progressive_mode) {
+#ifdef C_PROGRESSIVE_SUPPORTED
+      jinit_phuff_encoder(cinfo);
+#else
+      ERREXIT(cinfo, JERR_NOT_COMPILED);
+#endif
+    } else
+      jinit_huff_encoder(cinfo);
+  }
+
+  /* Need a full-image coefficient buffer in any multi-pass mode. */
+  jinit_c_coef_controller(cinfo,
+		(boolean) (cinfo->num_scans > 1 || cinfo->optimize_coding));
+  jinit_c_main_controller(cinfo, FALSE /* never need full buffer here */);
+
+  jinit_marker_writer(cinfo);
+
+  /* We can now tell the memory manager to allocate virtual arrays. */
+  (*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo);
+
+  /* Write the datastream header (SOI) immediately.
+   * Frame and scan headers are postponed till later.
+   * This lets application insert special markers after the SOI.
+   */
+  (*cinfo->marker->write_file_header) (cinfo);
+}
diff --git a/src/libjpeg-turbo/jcmainct.c b/src/libjpeg-turbo/jcmainct.c
new file mode 100644
index 0000000..bd0051a
--- /dev/null
+++ b/src/libjpeg-turbo/jcmainct.c
@@ -0,0 +1,293 @@
+/*
+ * jcmainct.c
+ *
+ * Copyright (C) 1994-1996, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains the main buffer controller for compression.
+ * The main buffer lies between the pre-processor and the JPEG
+ * compressor proper; it holds downsampled data in the JPEG colorspace.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+
+
+/* Note: currently, there is no operating mode in which a full-image buffer
+ * is needed at this step.  If there were, that mode could not be used with
+ * "raw data" input, since this module is bypassed in that case.  However,
+ * we've left the code here for possible use in special applications.
+ */
+#undef FULL_MAIN_BUFFER_SUPPORTED
+
+
+/* Private buffer controller object */
+
+typedef struct {
+  struct jpeg_c_main_controller pub; /* public fields */
+
+  JDIMENSION cur_iMCU_row;	/* number of current iMCU row */
+  JDIMENSION rowgroup_ctr;	/* counts row groups received in iMCU row */
+  boolean suspended;		/* remember if we suspended output */
+  J_BUF_MODE pass_mode;		/* current operating mode */
+
+  /* If using just a strip buffer, this points to the entire set of buffers
+   * (we allocate one for each component).  In the full-image case, this
+   * points to the currently accessible strips of the virtual arrays.
+   */
+  JSAMPARRAY buffer[MAX_COMPONENTS];
+
+#ifdef FULL_MAIN_BUFFER_SUPPORTED
+  /* If using full-image storage, this array holds pointers to virtual-array
+   * control blocks for each component.  Unused if not full-image storage.
+   */
+  jvirt_sarray_ptr whole_image[MAX_COMPONENTS];
+#endif
+} my_main_controller;
+
+typedef my_main_controller * my_main_ptr;
+
+
+/* Forward declarations */
+METHODDEF(void) process_data_simple_main
+	JPP((j_compress_ptr cinfo, JSAMPARRAY input_buf,
+	     JDIMENSION *in_row_ctr, JDIMENSION in_rows_avail));
+#ifdef FULL_MAIN_BUFFER_SUPPORTED
+METHODDEF(void) process_data_buffer_main
+	JPP((j_compress_ptr cinfo, JSAMPARRAY input_buf,
+	     JDIMENSION *in_row_ctr, JDIMENSION in_rows_avail));
+#endif
+
+
+/*
+ * Initialize for a processing pass.
+ */
+
+METHODDEF(void)
+start_pass_main (j_compress_ptr cinfo, J_BUF_MODE pass_mode)
+{
+  my_main_ptr main_ptr = (my_main_ptr) cinfo->main;
+
+  /* Do nothing in raw-data mode. */
+  if (cinfo->raw_data_in)
+    return;
+
+  main_ptr->cur_iMCU_row = 0;	/* initialize counters */
+  main_ptr->rowgroup_ctr = 0;
+  main_ptr->suspended = FALSE;
+  main_ptr->pass_mode = pass_mode;	/* save mode for use by process_data */
+
+  switch (pass_mode) {
+  case JBUF_PASS_THRU:
+#ifdef FULL_MAIN_BUFFER_SUPPORTED
+    if (main_ptr->whole_image[0] != NULL)
+      ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
+#endif
+    main_ptr->pub.process_data = process_data_simple_main;
+    break;
+#ifdef FULL_MAIN_BUFFER_SUPPORTED
+  case JBUF_SAVE_SOURCE:
+  case JBUF_CRANK_DEST:
+  case JBUF_SAVE_AND_PASS:
+    if (main_ptr->whole_image[0] == NULL)
+      ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
+    main_ptr->pub.process_data = process_data_buffer_main;
+    break;
+#endif
+  default:
+    ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
+    break;
+  }
+}
+
+
+/*
+ * Process some data.
+ * This routine handles the simple pass-through mode,
+ * where we have only a strip buffer.
+ */
+
+METHODDEF(void)
+process_data_simple_main (j_compress_ptr cinfo,
+			  JSAMPARRAY input_buf, JDIMENSION *in_row_ctr,
+			  JDIMENSION in_rows_avail)
+{
+  my_main_ptr main_ptr = (my_main_ptr) cinfo->main;
+
+  while (main_ptr->cur_iMCU_row < cinfo->total_iMCU_rows) {
+    /* Read input data if we haven't filled the main buffer yet */
+    if (main_ptr->rowgroup_ctr < DCTSIZE)
+      (*cinfo->prep->pre_process_data) (cinfo,
+					input_buf, in_row_ctr, in_rows_avail,
+					main_ptr->buffer, &main_ptr->rowgroup_ctr,
+					(JDIMENSION) DCTSIZE);
+
+    /* If we don't have a full iMCU row buffered, return to application for
+     * more data.  Note that preprocessor will always pad to fill the iMCU row
+     * at the bottom of the image.
+     */
+    if (main_ptr->rowgroup_ctr != DCTSIZE)
+      return;
+
+    /* Send the completed row to the compressor */
+    if (! (*cinfo->coef->compress_data) (cinfo, main_ptr->buffer)) {
+      /* If compressor did not consume the whole row, then we must need to
+       * suspend processing and return to the application.  In this situation
+       * we pretend we didn't yet consume the last input row; otherwise, if
+       * it happened to be the last row of the image, the application would
+       * think we were done.
+       */
+      if (! main_ptr->suspended) {
+	(*in_row_ctr)--;
+	main_ptr->suspended = TRUE;
+      }
+      return;
+    }
+    /* We did finish the row.  Undo our little suspension hack if a previous
+     * call suspended; then mark the main buffer empty.
+     */
+    if (main_ptr->suspended) {
+      (*in_row_ctr)++;
+      main_ptr->suspended = FALSE;
+    }
+    main_ptr->rowgroup_ctr = 0;
+    main_ptr->cur_iMCU_row++;
+  }
+}
+
+
+#ifdef FULL_MAIN_BUFFER_SUPPORTED
+
+/*
+ * Process some data.
+ * This routine handles all of the modes that use a full-size buffer.
+ */
+
+METHODDEF(void)
+process_data_buffer_main (j_compress_ptr cinfo,
+			  JSAMPARRAY input_buf, JDIMENSION *in_row_ctr,
+			  JDIMENSION in_rows_avail)
+{
+  my_main_ptr main = (my_main_ptr) cinfo->main;
+  int ci;
+  jpeg_component_info *compptr;
+  boolean writing = (main_ptr->pass_mode != JBUF_CRANK_DEST);
+
+  while (main_ptr->cur_iMCU_row < cinfo->total_iMCU_rows) {
+    /* Realign the virtual buffers if at the start of an iMCU row. */
+    if (main_ptr->rowgroup_ctr == 0) {
+      for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+	   ci++, compptr++) {
+	main_ptr->buffer[ci] = (*cinfo->mem->access_virt_sarray)
+	  ((j_common_ptr) cinfo, main_ptr->whole_image[ci],
+	   main_ptr->cur_iMCU_row * (compptr->v_samp_factor * DCTSIZE),
+	   (JDIMENSION) (compptr->v_samp_factor * DCTSIZE), writing);
+      }
+      /* In a read pass, pretend we just read some source data. */
+      if (! writing) {
+	*in_row_ctr += cinfo->max_v_samp_factor * DCTSIZE;
+	main_ptr->rowgroup_ctr = DCTSIZE;
+      }
+    }
+
+    /* If a write pass, read input data until the current iMCU row is full. */
+    /* Note: preprocessor will pad if necessary to fill the last iMCU row. */
+    if (writing) {
+      (*cinfo->prep->pre_process_data) (cinfo,
+					input_buf, in_row_ctr, in_rows_avail,
+					main_ptr->buffer, &main_ptr->rowgroup_ctr,
+					(JDIMENSION) DCTSIZE);
+      /* Return to application if we need more data to fill the iMCU row. */
+      if (main_ptr->rowgroup_ctr < DCTSIZE)
+	return;
+    }
+
+    /* Emit data, unless this is a sink-only pass. */
+    if (main_ptr->pass_mode != JBUF_SAVE_SOURCE) {
+      if (! (*cinfo->coef->compress_data) (cinfo, main_ptr->buffer)) {
+	/* If compressor did not consume the whole row, then we must need to
+	 * suspend processing and return to the application.  In this situation
+	 * we pretend we didn't yet consume the last input row; otherwise, if
+	 * it happened to be the last row of the image, the application would
+	 * think we were done.
+	 */
+	if (! main_ptr->suspended) {
+	  (*in_row_ctr)--;
+	  main_ptr->suspended = TRUE;
+	}
+	return;
+      }
+      /* We did finish the row.  Undo our little suspension hack if a previous
+       * call suspended; then mark the main buffer empty.
+       */
+      if (main_ptr->suspended) {
+	(*in_row_ctr)++;
+	main_ptr->suspended = FALSE;
+      }
+    }
+
+    /* If get here, we are done with this iMCU row.  Mark buffer empty. */
+    main_ptr->rowgroup_ctr = 0;
+    main_ptr->cur_iMCU_row++;
+  }
+}
+
+#endif /* FULL_MAIN_BUFFER_SUPPORTED */
+
+
+/*
+ * Initialize main buffer controller.
+ */
+
+GLOBAL(void)
+jinit_c_main_controller (j_compress_ptr cinfo, boolean need_full_buffer)
+{
+  my_main_ptr main_ptr;
+  int ci;
+  jpeg_component_info *compptr;
+
+  main_ptr = (my_main_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				SIZEOF(my_main_controller));
+  cinfo->main = (struct jpeg_c_main_controller *) main_ptr;
+  main_ptr->pub.start_pass = start_pass_main;
+
+  /* We don't need to create a buffer in raw-data mode. */
+  if (cinfo->raw_data_in)
+    return;
+
+  /* Create the buffer.  It holds downsampled data, so each component
+   * may be of a different size.
+   */
+  if (need_full_buffer) {
+#ifdef FULL_MAIN_BUFFER_SUPPORTED
+    /* Allocate a full-image virtual array for each component */
+    /* Note we pad the bottom to a multiple of the iMCU height */
+    for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+	 ci++, compptr++) {
+      main_ptr->whole_image[ci] = (*cinfo->mem->request_virt_sarray)
+	((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE,
+	 compptr->width_in_blocks * DCTSIZE,
+	 (JDIMENSION) jround_up((long) compptr->height_in_blocks,
+				(long) compptr->v_samp_factor) * DCTSIZE,
+	 (JDIMENSION) (compptr->v_samp_factor * DCTSIZE));
+    }
+#else
+    ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
+#endif
+  } else {
+#ifdef FULL_MAIN_BUFFER_SUPPORTED
+    main_ptr->whole_image[0] = NULL; /* flag for no virtual arrays */
+#endif
+    /* Allocate a strip buffer for each component */
+    for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+	 ci++, compptr++) {
+      main_ptr->buffer[ci] = (*cinfo->mem->alloc_sarray)
+	((j_common_ptr) cinfo, JPOOL_IMAGE,
+	 compptr->width_in_blocks * DCTSIZE,
+	 (JDIMENSION) (compptr->v_samp_factor * DCTSIZE));
+    }
+  }
+}
diff --git a/src/libjpeg-turbo/jcmarker.c b/src/libjpeg-turbo/jcmarker.c
new file mode 100644
index 0000000..b1c1e45
--- /dev/null
+++ b/src/libjpeg-turbo/jcmarker.c
@@ -0,0 +1,666 @@
+/*
+ * jcmarker.c
+ *
+ * Copyright (C) 1991-1998, Thomas G. Lane.
+ * Copyright (C) 2010, D. R. Commander.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains routines to write JPEG datastream markers.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jpegcomp.h"
+
+
+typedef enum {			/* JPEG marker codes */
+  M_SOF0  = 0xc0,
+  M_SOF1  = 0xc1,
+  M_SOF2  = 0xc2,
+  M_SOF3  = 0xc3,
+  
+  M_SOF5  = 0xc5,
+  M_SOF6  = 0xc6,
+  M_SOF7  = 0xc7,
+  
+  M_JPG   = 0xc8,
+  M_SOF9  = 0xc9,
+  M_SOF10 = 0xca,
+  M_SOF11 = 0xcb,
+  
+  M_SOF13 = 0xcd,
+  M_SOF14 = 0xce,
+  M_SOF15 = 0xcf,
+  
+  M_DHT   = 0xc4,
+  
+  M_DAC   = 0xcc,
+  
+  M_RST0  = 0xd0,
+  M_RST1  = 0xd1,
+  M_RST2  = 0xd2,
+  M_RST3  = 0xd3,
+  M_RST4  = 0xd4,
+  M_RST5  = 0xd5,
+  M_RST6  = 0xd6,
+  M_RST7  = 0xd7,
+  
+  M_SOI   = 0xd8,
+  M_EOI   = 0xd9,
+  M_SOS   = 0xda,
+  M_DQT   = 0xdb,
+  M_DNL   = 0xdc,
+  M_DRI   = 0xdd,
+  M_DHP   = 0xde,
+  M_EXP   = 0xdf,
+  
+  M_APP0  = 0xe0,
+  M_APP1  = 0xe1,
+  M_APP2  = 0xe2,
+  M_APP3  = 0xe3,
+  M_APP4  = 0xe4,
+  M_APP5  = 0xe5,
+  M_APP6  = 0xe6,
+  M_APP7  = 0xe7,
+  M_APP8  = 0xe8,
+  M_APP9  = 0xe9,
+  M_APP10 = 0xea,
+  M_APP11 = 0xeb,
+  M_APP12 = 0xec,
+  M_APP13 = 0xed,
+  M_APP14 = 0xee,
+  M_APP15 = 0xef,
+  
+  M_JPG0  = 0xf0,
+  M_JPG13 = 0xfd,
+  M_COM   = 0xfe,
+  
+  M_TEM   = 0x01,
+  
+  M_ERROR = 0x100
+} JPEG_MARKER;
+
+
+/* Private state */
+
+typedef struct {
+  struct jpeg_marker_writer pub; /* public fields */
+
+  unsigned int last_restart_interval; /* last DRI value emitted; 0 after SOI */
+} my_marker_writer;
+
+typedef my_marker_writer * my_marker_ptr;
+
+
+/*
+ * Basic output routines.
+ *
+ * Note that we do not support suspension while writing a marker.
+ * Therefore, an application using suspension must ensure that there is
+ * enough buffer space for the initial markers (typ. 600-700 bytes) before
+ * calling jpeg_start_compress, and enough space to write the trailing EOI
+ * (a few bytes) before calling jpeg_finish_compress.  Multipass compression
+ * modes are not supported at all with suspension, so those two are the only
+ * points where markers will be written.
+ */
+
+LOCAL(void)
+emit_byte (j_compress_ptr cinfo, int val)
+/* Emit a byte */
+{
+  struct jpeg_destination_mgr * dest = cinfo->dest;
+
+  *(dest->next_output_byte)++ = (JOCTET) val;
+  if (--dest->free_in_buffer == 0) {
+    if (! (*dest->empty_output_buffer) (cinfo))
+      ERREXIT(cinfo, JERR_CANT_SUSPEND);
+  }
+}
+
+
+LOCAL(void)
+emit_marker (j_compress_ptr cinfo, JPEG_MARKER mark)
+/* Emit a marker code */
+{
+  emit_byte(cinfo, 0xFF);
+  emit_byte(cinfo, (int) mark);
+}
+
+
+LOCAL(void)
+emit_2bytes (j_compress_ptr cinfo, int value)
+/* Emit a 2-byte integer; these are always MSB first in JPEG files */
+{
+  emit_byte(cinfo, (value >> 8) & 0xFF);
+  emit_byte(cinfo, value & 0xFF);
+}
+
+
+/*
+ * Routines to write specific marker types.
+ */
+
+LOCAL(int)
+emit_dqt (j_compress_ptr cinfo, int index)
+/* Emit a DQT marker */
+/* Returns the precision used (0 = 8bits, 1 = 16bits) for baseline checking */
+{
+  JQUANT_TBL * qtbl = cinfo->quant_tbl_ptrs[index];
+  int prec;
+  int i;
+
+  if (qtbl == NULL)
+    ERREXIT1(cinfo, JERR_NO_QUANT_TABLE, index);
+
+  prec = 0;
+  for (i = 0; i < DCTSIZE2; i++) {
+    if (qtbl->quantval[i] > 255)
+      prec = 1;
+  }
+
+  if (! qtbl->sent_table) {
+    emit_marker(cinfo, M_DQT);
+
+    emit_2bytes(cinfo, prec ? DCTSIZE2*2 + 1 + 2 : DCTSIZE2 + 1 + 2);
+
+    emit_byte(cinfo, index + (prec<<4));
+
+    for (i = 0; i < DCTSIZE2; i++) {
+      /* The table entries must be emitted in zigzag order. */
+      unsigned int qval = qtbl->quantval[jpeg_natural_order[i]];
+      if (prec)
+	emit_byte(cinfo, (int) (qval >> 8));
+      emit_byte(cinfo, (int) (qval & 0xFF));
+    }
+
+    qtbl->sent_table = TRUE;
+  }
+
+  return prec;
+}
+
+
+LOCAL(void)
+emit_dht (j_compress_ptr cinfo, int index, boolean is_ac)
+/* Emit a DHT marker */
+{
+  JHUFF_TBL * htbl;
+  int length, i;
+  
+  if (is_ac) {
+    htbl = cinfo->ac_huff_tbl_ptrs[index];
+    index += 0x10;		/* output index has AC bit set */
+  } else {
+    htbl = cinfo->dc_huff_tbl_ptrs[index];
+  }
+
+  if (htbl == NULL)
+    ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, index);
+  
+  if (! htbl->sent_table) {
+    emit_marker(cinfo, M_DHT);
+    
+    length = 0;
+    for (i = 1; i <= 16; i++)
+      length += htbl->bits[i];
+    
+    emit_2bytes(cinfo, length + 2 + 1 + 16);
+    emit_byte(cinfo, index);
+    
+    for (i = 1; i <= 16; i++)
+      emit_byte(cinfo, htbl->bits[i]);
+    
+    for (i = 0; i < length; i++)
+      emit_byte(cinfo, htbl->huffval[i]);
+    
+    htbl->sent_table = TRUE;
+  }
+}
+
+
+LOCAL(void)
+emit_dac (j_compress_ptr cinfo)
+/* Emit a DAC marker */
+/* Since the useful info is so small, we want to emit all the tables in */
+/* one DAC marker.  Therefore this routine does its own scan of the table. */
+{
+#ifdef C_ARITH_CODING_SUPPORTED
+  char dc_in_use[NUM_ARITH_TBLS];
+  char ac_in_use[NUM_ARITH_TBLS];
+  int length, i;
+  jpeg_component_info *compptr;
+  
+  for (i = 0; i < NUM_ARITH_TBLS; i++)
+    dc_in_use[i] = ac_in_use[i] = 0;
+  
+  for (i = 0; i < cinfo->comps_in_scan; i++) {
+    compptr = cinfo->cur_comp_info[i];
+    dc_in_use[compptr->dc_tbl_no] = 1;
+    ac_in_use[compptr->ac_tbl_no] = 1;
+  }
+  
+  length = 0;
+  for (i = 0; i < NUM_ARITH_TBLS; i++)
+    length += dc_in_use[i] + ac_in_use[i];
+  
+  emit_marker(cinfo, M_DAC);
+  
+  emit_2bytes(cinfo, length*2 + 2);
+  
+  for (i = 0; i < NUM_ARITH_TBLS; i++) {
+    if (dc_in_use[i]) {
+      emit_byte(cinfo, i);
+      emit_byte(cinfo, cinfo->arith_dc_L[i] + (cinfo->arith_dc_U[i]<<4));
+    }
+    if (ac_in_use[i]) {
+      emit_byte(cinfo, i + 0x10);
+      emit_byte(cinfo, cinfo->arith_ac_K[i]);
+    }
+  }
+#endif /* C_ARITH_CODING_SUPPORTED */
+}
+
+
+LOCAL(void)
+emit_dri (j_compress_ptr cinfo)
+/* Emit a DRI marker */
+{
+  emit_marker(cinfo, M_DRI);
+  
+  emit_2bytes(cinfo, 4);	/* fixed length */
+
+  emit_2bytes(cinfo, (int) cinfo->restart_interval);
+}
+
+
+LOCAL(void)
+emit_sof (j_compress_ptr cinfo, JPEG_MARKER code)
+/* Emit a SOF marker */
+{
+  int ci;
+  jpeg_component_info *compptr;
+  
+  emit_marker(cinfo, code);
+  
+  emit_2bytes(cinfo, 3 * cinfo->num_components + 2 + 5 + 1); /* length */
+
+  /* Make sure image isn't bigger than SOF field can handle */
+  if ((long) cinfo->_jpeg_height > 65535L ||
+      (long) cinfo->_jpeg_width > 65535L)
+    ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) 65535);
+
+  emit_byte(cinfo, cinfo->data_precision);
+  emit_2bytes(cinfo, (int) cinfo->_jpeg_height);
+  emit_2bytes(cinfo, (int) cinfo->_jpeg_width);
+
+  emit_byte(cinfo, cinfo->num_components);
+
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    emit_byte(cinfo, compptr->component_id);
+    emit_byte(cinfo, (compptr->h_samp_factor << 4) + compptr->v_samp_factor);
+    emit_byte(cinfo, compptr->quant_tbl_no);
+  }
+}
+
+
+LOCAL(void)
+emit_sos (j_compress_ptr cinfo)
+/* Emit a SOS marker */
+{
+  int i, td, ta;
+  jpeg_component_info *compptr;
+  
+  emit_marker(cinfo, M_SOS);
+  
+  emit_2bytes(cinfo, 2 * cinfo->comps_in_scan + 2 + 1 + 3); /* length */
+  
+  emit_byte(cinfo, cinfo->comps_in_scan);
+  
+  for (i = 0; i < cinfo->comps_in_scan; i++) {
+    compptr = cinfo->cur_comp_info[i];
+    emit_byte(cinfo, compptr->component_id);
+    td = compptr->dc_tbl_no;
+    ta = compptr->ac_tbl_no;
+    if (cinfo->progressive_mode) {
+      /* Progressive mode: only DC or only AC tables are used in one scan;
+       * furthermore, Huffman coding of DC refinement uses no table at all.
+       * We emit 0 for unused field(s); this is recommended by the P&M text
+       * but does not seem to be specified in the standard.
+       */
+      if (cinfo->Ss == 0) {
+	ta = 0;			/* DC scan */
+	if (cinfo->Ah != 0 && !cinfo->arith_code)
+	  td = 0;		/* no DC table either */
+      } else {
+	td = 0;			/* AC scan */
+      }
+    }
+    emit_byte(cinfo, (td << 4) + ta);
+  }
+
+  emit_byte(cinfo, cinfo->Ss);
+  emit_byte(cinfo, cinfo->Se);
+  emit_byte(cinfo, (cinfo->Ah << 4) + cinfo->Al);
+}
+
+
+LOCAL(void)
+emit_jfif_app0 (j_compress_ptr cinfo)
+/* Emit a JFIF-compliant APP0 marker */
+{
+  /*
+   * Length of APP0 block	(2 bytes)
+   * Block ID			(4 bytes - ASCII "JFIF")
+   * Zero byte			(1 byte to terminate the ID string)
+   * Version Major, Minor	(2 bytes - major first)
+   * Units			(1 byte - 0x00 = none, 0x01 = inch, 0x02 = cm)
+   * Xdpu			(2 bytes - dots per unit horizontal)
+   * Ydpu			(2 bytes - dots per unit vertical)
+   * Thumbnail X size		(1 byte)
+   * Thumbnail Y size		(1 byte)
+   */
+  
+  emit_marker(cinfo, M_APP0);
+  
+  emit_2bytes(cinfo, 2 + 4 + 1 + 2 + 1 + 2 + 2 + 1 + 1); /* length */
+
+  emit_byte(cinfo, 0x4A);	/* Identifier: ASCII "JFIF" */
+  emit_byte(cinfo, 0x46);
+  emit_byte(cinfo, 0x49);
+  emit_byte(cinfo, 0x46);
+  emit_byte(cinfo, 0);
+  emit_byte(cinfo, cinfo->JFIF_major_version); /* Version fields */
+  emit_byte(cinfo, cinfo->JFIF_minor_version);
+  emit_byte(cinfo, cinfo->density_unit); /* Pixel size information */
+  emit_2bytes(cinfo, (int) cinfo->X_density);
+  emit_2bytes(cinfo, (int) cinfo->Y_density);
+  emit_byte(cinfo, 0);		/* No thumbnail image */
+  emit_byte(cinfo, 0);
+}
+
+
+LOCAL(void)
+emit_adobe_app14 (j_compress_ptr cinfo)
+/* Emit an Adobe APP14 marker */
+{
+  /*
+   * Length of APP14 block	(2 bytes)
+   * Block ID			(5 bytes - ASCII "Adobe")
+   * Version Number		(2 bytes - currently 100)
+   * Flags0			(2 bytes - currently 0)
+   * Flags1			(2 bytes - currently 0)
+   * Color transform		(1 byte)
+   *
+   * Although Adobe TN 5116 mentions Version = 101, all the Adobe files
+   * now in circulation seem to use Version = 100, so that's what we write.
+   *
+   * We write the color transform byte as 1 if the JPEG color space is
+   * YCbCr, 2 if it's YCCK, 0 otherwise.  Adobe's definition has to do with
+   * whether the encoder performed a transformation, which is pretty useless.
+   */
+  
+  emit_marker(cinfo, M_APP14);
+  
+  emit_2bytes(cinfo, 2 + 5 + 2 + 2 + 2 + 1); /* length */
+
+  emit_byte(cinfo, 0x41);	/* Identifier: ASCII "Adobe" */
+  emit_byte(cinfo, 0x64);
+  emit_byte(cinfo, 0x6F);
+  emit_byte(cinfo, 0x62);
+  emit_byte(cinfo, 0x65);
+  emit_2bytes(cinfo, 100);	/* Version */
+  emit_2bytes(cinfo, 0);	/* Flags0 */
+  emit_2bytes(cinfo, 0);	/* Flags1 */
+  switch (cinfo->jpeg_color_space) {
+  case JCS_YCbCr:
+    emit_byte(cinfo, 1);	/* Color transform = 1 */
+    break;
+  case JCS_YCCK:
+    emit_byte(cinfo, 2);	/* Color transform = 2 */
+    break;
+  default:
+    emit_byte(cinfo, 0);	/* Color transform = 0 */
+    break;
+  }
+}
+
+
+/*
+ * These routines allow writing an arbitrary marker with parameters.
+ * The only intended use is to emit COM or APPn markers after calling
+ * write_file_header and before calling write_frame_header.
+ * Other uses are not guaranteed to produce desirable results.
+ * Counting the parameter bytes properly is the caller's responsibility.
+ */
+
+METHODDEF(void)
+write_marker_header (j_compress_ptr cinfo, int marker, unsigned int datalen)
+/* Emit an arbitrary marker header */
+{
+  if (datalen > (unsigned int) 65533)		/* safety check */
+    ERREXIT(cinfo, JERR_BAD_LENGTH);
+
+  emit_marker(cinfo, (JPEG_MARKER) marker);
+
+  emit_2bytes(cinfo, (int) (datalen + 2));	/* total length */
+}
+
+METHODDEF(void)
+write_marker_byte (j_compress_ptr cinfo, int val)
+/* Emit one byte of marker parameters following write_marker_header */
+{
+  emit_byte(cinfo, val);
+}
+
+
+/*
+ * Write datastream header.
+ * This consists of an SOI and optional APPn markers.
+ * We recommend use of the JFIF marker, but not the Adobe marker,
+ * when using YCbCr or grayscale data.  The JFIF marker should NOT
+ * be used for any other JPEG colorspace.  The Adobe marker is helpful
+ * to distinguish RGB, CMYK, and YCCK colorspaces.
+ * Note that an application can write additional header markers after
+ * jpeg_start_compress returns.
+ */
+
+METHODDEF(void)
+write_file_header (j_compress_ptr cinfo)
+{
+  my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
+
+  emit_marker(cinfo, M_SOI);	/* first the SOI */
+
+  /* SOI is defined to reset restart interval to 0 */
+  marker->last_restart_interval = 0;
+
+  if (cinfo->write_JFIF_header)	/* next an optional JFIF APP0 */
+    emit_jfif_app0(cinfo);
+  if (cinfo->write_Adobe_marker) /* next an optional Adobe APP14 */
+    emit_adobe_app14(cinfo);
+}
+
+
+/*
+ * Write frame header.
+ * This consists of DQT and SOFn markers.
+ * Note that we do not emit the SOF until we have emitted the DQT(s).
+ * This avoids compatibility problems with incorrect implementations that
+ * try to error-check the quant table numbers as soon as they see the SOF.
+ */
+
+METHODDEF(void)
+write_frame_header (j_compress_ptr cinfo)
+{
+  int ci, prec;
+  boolean is_baseline;
+  jpeg_component_info *compptr;
+  
+  /* Emit DQT for each quantization table.
+   * Note that emit_dqt() suppresses any duplicate tables.
+   */
+  prec = 0;
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    prec += emit_dqt(cinfo, compptr->quant_tbl_no);
+  }
+  /* now prec is nonzero iff there are any 16-bit quant tables. */
+
+  /* Check for a non-baseline specification.
+   * Note we assume that Huffman table numbers won't be changed later.
+   */
+  if (cinfo->arith_code || cinfo->progressive_mode ||
+      cinfo->data_precision != 8) {
+    is_baseline = FALSE;
+  } else {
+    is_baseline = TRUE;
+    for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+	 ci++, compptr++) {
+      if (compptr->dc_tbl_no > 1 || compptr->ac_tbl_no > 1)
+	is_baseline = FALSE;
+    }
+    if (prec && is_baseline) {
+      is_baseline = FALSE;
+      /* If it's baseline except for quantizer size, warn the user */
+      TRACEMS(cinfo, 0, JTRC_16BIT_TABLES);
+    }
+  }
+
+  /* Emit the proper SOF marker */
+  if (cinfo->arith_code) {
+    emit_sof(cinfo, M_SOF9);	/* SOF code for arithmetic coding */
+  } else {
+    if (cinfo->progressive_mode)
+      emit_sof(cinfo, M_SOF2);	/* SOF code for progressive Huffman */
+    else if (is_baseline)
+      emit_sof(cinfo, M_SOF0);	/* SOF code for baseline implementation */
+    else
+      emit_sof(cinfo, M_SOF1);	/* SOF code for non-baseline Huffman file */
+  }
+}
+
+
+/*
+ * Write scan header.
+ * This consists of DHT or DAC markers, optional DRI, and SOS.
+ * Compressed data will be written following the SOS.
+ */
+
+METHODDEF(void)
+write_scan_header (j_compress_ptr cinfo)
+{
+  my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
+  int i;
+  jpeg_component_info *compptr;
+
+  if (cinfo->arith_code) {
+    /* Emit arith conditioning info.  We may have some duplication
+     * if the file has multiple scans, but it's so small it's hardly
+     * worth worrying about.
+     */
+    emit_dac(cinfo);
+  } else {
+    /* Emit Huffman tables.
+     * Note that emit_dht() suppresses any duplicate tables.
+     */
+    for (i = 0; i < cinfo->comps_in_scan; i++) {
+      compptr = cinfo->cur_comp_info[i];
+      if (cinfo->progressive_mode) {
+	/* Progressive mode: only DC or only AC tables are used in one scan */
+	if (cinfo->Ss == 0) {
+	  if (cinfo->Ah == 0)	/* DC needs no table for refinement scan */
+	    emit_dht(cinfo, compptr->dc_tbl_no, FALSE);
+	} else {
+	  emit_dht(cinfo, compptr->ac_tbl_no, TRUE);
+	}
+      } else {
+	/* Sequential mode: need both DC and AC tables */
+	emit_dht(cinfo, compptr->dc_tbl_no, FALSE);
+	emit_dht(cinfo, compptr->ac_tbl_no, TRUE);
+      }
+    }
+  }
+
+  /* Emit DRI if required --- note that DRI value could change for each scan.
+   * We avoid wasting space with unnecessary DRIs, however.
+   */
+  if (cinfo->restart_interval != marker->last_restart_interval) {
+    emit_dri(cinfo);
+    marker->last_restart_interval = cinfo->restart_interval;
+  }
+
+  emit_sos(cinfo);
+}
+
+
+/*
+ * Write datastream trailer.
+ */
+
+METHODDEF(void)
+write_file_trailer (j_compress_ptr cinfo)
+{
+  emit_marker(cinfo, M_EOI);
+}
+
+
+/*
+ * Write an abbreviated table-specification datastream.
+ * This consists of SOI, DQT and DHT tables, and EOI.
+ * Any table that is defined and not marked sent_table = TRUE will be
+ * emitted.  Note that all tables will be marked sent_table = TRUE at exit.
+ */
+
+METHODDEF(void)
+write_tables_only (j_compress_ptr cinfo)
+{
+  int i;
+
+  emit_marker(cinfo, M_SOI);
+
+  for (i = 0; i < NUM_QUANT_TBLS; i++) {
+    if (cinfo->quant_tbl_ptrs[i] != NULL)
+      (void) emit_dqt(cinfo, i);
+  }
+
+  if (! cinfo->arith_code) {
+    for (i = 0; i < NUM_HUFF_TBLS; i++) {
+      if (cinfo->dc_huff_tbl_ptrs[i] != NULL)
+	emit_dht(cinfo, i, FALSE);
+      if (cinfo->ac_huff_tbl_ptrs[i] != NULL)
+	emit_dht(cinfo, i, TRUE);
+    }
+  }
+
+  emit_marker(cinfo, M_EOI);
+}
+
+
+/*
+ * Initialize the marker writer module.
+ */
+
+GLOBAL(void)
+jinit_marker_writer (j_compress_ptr cinfo)
+{
+  my_marker_ptr marker;
+
+  /* Create the subobject */
+  marker = (my_marker_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				SIZEOF(my_marker_writer));
+  cinfo->marker = (struct jpeg_marker_writer *) marker;
+  /* Initialize method pointers */
+  marker->pub.write_file_header = write_file_header;
+  marker->pub.write_frame_header = write_frame_header;
+  marker->pub.write_scan_header = write_scan_header;
+  marker->pub.write_file_trailer = write_file_trailer;
+  marker->pub.write_tables_only = write_tables_only;
+  marker->pub.write_marker_header = write_marker_header;
+  marker->pub.write_marker_byte = write_marker_byte;
+  /* Initialize private state */
+  marker->last_restart_interval = 0;
+}
diff --git a/src/libjpeg-turbo/jcmaster.c b/src/libjpeg-turbo/jcmaster.c
new file mode 100644
index 0000000..3ca346c
--- /dev/null
+++ b/src/libjpeg-turbo/jcmaster.c
@@ -0,0 +1,624 @@
+/*
+ * jcmaster.c
+ *
+ * Copyright (C) 1991-1997, Thomas G. Lane.
+ * Modified 2003-2010 by Guido Vollbeding.
+ * Copyright (C) 2010, D. R. Commander.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains master control logic for the JPEG compressor.
+ * These routines are concerned with parameter validation, initial setup,
+ * and inter-pass control (determining the number of passes and the work 
+ * to be done in each pass).
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jpegcomp.h"
+
+
+/* Private state */
+
+typedef enum {
+	main_pass,		/* input data, also do first output step */
+	huff_opt_pass,		/* Huffman code optimization pass */
+	output_pass		/* data output pass */
+} c_pass_type;
+
+typedef struct {
+  struct jpeg_comp_master pub;	/* public fields */
+
+  c_pass_type pass_type;	/* the type of the current pass */
+
+  int pass_number;		/* # of passes completed */
+  int total_passes;		/* total # of passes needed */
+
+  int scan_number;		/* current index in scan_info[] */
+} my_comp_master;
+
+typedef my_comp_master * my_master_ptr;
+
+
+/*
+ * Support routines that do various essential calculations.
+ */
+
+#if JPEG_LIB_VERSION >= 70
+/*
+ * Compute JPEG image dimensions and related values.
+ * NOTE: this is exported for possible use by application.
+ * Hence it mustn't do anything that can't be done twice.
+ */
+
+GLOBAL(void)
+jpeg_calc_jpeg_dimensions (j_compress_ptr cinfo)
+/* Do computations that are needed before master selection phase */
+{
+  /* Hardwire it to "no scaling" */
+  cinfo->jpeg_width = cinfo->image_width;
+  cinfo->jpeg_height = cinfo->image_height;
+  cinfo->min_DCT_h_scaled_size = DCTSIZE;
+  cinfo->min_DCT_v_scaled_size = DCTSIZE;
+}
+#endif
+
+
+LOCAL(void)
+initial_setup (j_compress_ptr cinfo, boolean transcode_only)
+/* Do computations that are needed before master selection phase */
+{
+  int ci;
+  jpeg_component_info *compptr;
+  long samplesperrow;
+  JDIMENSION jd_samplesperrow;
+
+#if JPEG_LIB_VERSION >= 70
+#if JPEG_LIB_VERSION >= 80
+  if (!transcode_only)
+#endif
+    jpeg_calc_jpeg_dimensions(cinfo);
+#endif
+
+  /* Sanity check on image dimensions */
+  if (cinfo->_jpeg_height <= 0 || cinfo->_jpeg_width <= 0
+      || cinfo->num_components <= 0 || cinfo->input_components <= 0)
+    ERREXIT(cinfo, JERR_EMPTY_IMAGE);
+
+  /* Make sure image isn't bigger than I can handle */
+  if ((long) cinfo->_jpeg_height > (long) JPEG_MAX_DIMENSION ||
+      (long) cinfo->_jpeg_width > (long) JPEG_MAX_DIMENSION)
+    ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) JPEG_MAX_DIMENSION);
+
+  /* Width of an input scanline must be representable as JDIMENSION. */
+  samplesperrow = (long) cinfo->image_width * (long) cinfo->input_components;
+  jd_samplesperrow = (JDIMENSION) samplesperrow;
+  if ((long) jd_samplesperrow != samplesperrow)
+    ERREXIT(cinfo, JERR_WIDTH_OVERFLOW);
+
+  /* For now, precision must match compiled-in value... */
+  if (cinfo->data_precision != BITS_IN_JSAMPLE)
+    ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision);
+
+  /* Check that number of components won't exceed internal array sizes */
+  if (cinfo->num_components > MAX_COMPONENTS)
+    ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components,
+	     MAX_COMPONENTS);
+
+  /* Compute maximum sampling factors; check factor validity */
+  cinfo->max_h_samp_factor = 1;
+  cinfo->max_v_samp_factor = 1;
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    if (compptr->h_samp_factor<=0 || compptr->h_samp_factor>MAX_SAMP_FACTOR ||
+	compptr->v_samp_factor<=0 || compptr->v_samp_factor>MAX_SAMP_FACTOR)
+      ERREXIT(cinfo, JERR_BAD_SAMPLING);
+    cinfo->max_h_samp_factor = MAX(cinfo->max_h_samp_factor,
+				   compptr->h_samp_factor);
+    cinfo->max_v_samp_factor = MAX(cinfo->max_v_samp_factor,
+				   compptr->v_samp_factor);
+  }
+
+  /* Compute dimensions of components */
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    /* Fill in the correct component_index value; don't rely on application */
+    compptr->component_index = ci;
+    /* For compression, we never do DCT scaling. */
+#if JPEG_LIB_VERSION >= 70
+    compptr->DCT_h_scaled_size = compptr->DCT_v_scaled_size = DCTSIZE;
+#else
+    compptr->DCT_scaled_size = DCTSIZE;
+#endif
+    /* Size in DCT blocks */
+    compptr->width_in_blocks = (JDIMENSION)
+      jdiv_round_up((long) cinfo->_jpeg_width * (long) compptr->h_samp_factor,
+		    (long) (cinfo->max_h_samp_factor * DCTSIZE));
+    compptr->height_in_blocks = (JDIMENSION)
+      jdiv_round_up((long) cinfo->_jpeg_height * (long) compptr->v_samp_factor,
+		    (long) (cinfo->max_v_samp_factor * DCTSIZE));
+    /* Size in samples */
+    compptr->downsampled_width = (JDIMENSION)
+      jdiv_round_up((long) cinfo->_jpeg_width * (long) compptr->h_samp_factor,
+		    (long) cinfo->max_h_samp_factor);
+    compptr->downsampled_height = (JDIMENSION)
+      jdiv_round_up((long) cinfo->_jpeg_height * (long) compptr->v_samp_factor,
+		    (long) cinfo->max_v_samp_factor);
+    /* Mark component needed (this flag isn't actually used for compression) */
+    compptr->component_needed = TRUE;
+  }
+
+  /* Compute number of fully interleaved MCU rows (number of times that
+   * main controller will call coefficient controller).
+   */
+  cinfo->total_iMCU_rows = (JDIMENSION)
+    jdiv_round_up((long) cinfo->_jpeg_height,
+		  (long) (cinfo->max_v_samp_factor*DCTSIZE));
+}
+
+
+#ifdef C_MULTISCAN_FILES_SUPPORTED
+
+LOCAL(void)
+validate_script (j_compress_ptr cinfo)
+/* Verify that the scan script in cinfo->scan_info[] is valid; also
+ * determine whether it uses progressive JPEG, and set cinfo->progressive_mode.
+ */
+{
+  const jpeg_scan_info * scanptr;
+  int scanno, ncomps, ci, coefi, thisi;
+  int Ss, Se, Ah, Al;
+  boolean component_sent[MAX_COMPONENTS];
+#ifdef C_PROGRESSIVE_SUPPORTED
+  int * last_bitpos_ptr;
+  int last_bitpos[MAX_COMPONENTS][DCTSIZE2];
+  /* -1 until that coefficient has been seen; then last Al for it */
+#endif
+
+  if (cinfo->num_scans <= 0)
+    ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, 0);
+
+  /* For sequential JPEG, all scans must have Ss=0, Se=DCTSIZE2-1;
+   * for progressive JPEG, no scan can have this.
+   */
+  scanptr = cinfo->scan_info;
+  if (scanptr->Ss != 0 || scanptr->Se != DCTSIZE2-1) {
+#ifdef C_PROGRESSIVE_SUPPORTED
+    cinfo->progressive_mode = TRUE;
+    last_bitpos_ptr = & last_bitpos[0][0];
+    for (ci = 0; ci < cinfo->num_components; ci++) 
+      for (coefi = 0; coefi < DCTSIZE2; coefi++)
+	*last_bitpos_ptr++ = -1;
+#else
+    ERREXIT(cinfo, JERR_NOT_COMPILED);
+#endif
+  } else {
+    cinfo->progressive_mode = FALSE;
+    for (ci = 0; ci < cinfo->num_components; ci++) 
+      component_sent[ci] = FALSE;
+  }
+
+  for (scanno = 1; scanno <= cinfo->num_scans; scanptr++, scanno++) {
+    /* Validate component indexes */
+    ncomps = scanptr->comps_in_scan;
+    if (ncomps <= 0 || ncomps > MAX_COMPS_IN_SCAN)
+      ERREXIT2(cinfo, JERR_COMPONENT_COUNT, ncomps, MAX_COMPS_IN_SCAN);
+    for (ci = 0; ci < ncomps; ci++) {
+      thisi = scanptr->component_index[ci];
+      if (thisi < 0 || thisi >= cinfo->num_components)
+	ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno);
+      /* Components must appear in SOF order within each scan */
+      if (ci > 0 && thisi <= scanptr->component_index[ci-1])
+	ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno);
+    }
+    /* Validate progression parameters */
+    Ss = scanptr->Ss;
+    Se = scanptr->Se;
+    Ah = scanptr->Ah;
+    Al = scanptr->Al;
+    if (cinfo->progressive_mode) {
+#ifdef C_PROGRESSIVE_SUPPORTED
+      /* The JPEG spec simply gives the ranges 0..13 for Ah and Al, but that
+       * seems wrong: the upper bound ought to depend on data precision.
+       * Perhaps they really meant 0..N+1 for N-bit precision.
+       * Here we allow 0..10 for 8-bit data; Al larger than 10 results in
+       * out-of-range reconstructed DC values during the first DC scan,
+       * which might cause problems for some decoders.
+       */
+#if BITS_IN_JSAMPLE == 8
+#define MAX_AH_AL 10
+#else
+#define MAX_AH_AL 13
+#endif
+      if (Ss < 0 || Ss >= DCTSIZE2 || Se < Ss || Se >= DCTSIZE2 ||
+	  Ah < 0 || Ah > MAX_AH_AL || Al < 0 || Al > MAX_AH_AL)
+	ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
+      if (Ss == 0) {
+	if (Se != 0)		/* DC and AC together not OK */
+	  ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
+      } else {
+	if (ncomps != 1)	/* AC scans must be for only one component */
+	  ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
+      }
+      for (ci = 0; ci < ncomps; ci++) {
+	last_bitpos_ptr = & last_bitpos[scanptr->component_index[ci]][0];
+	if (Ss != 0 && last_bitpos_ptr[0] < 0) /* AC without prior DC scan */
+	  ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
+	for (coefi = Ss; coefi <= Se; coefi++) {
+	  if (last_bitpos_ptr[coefi] < 0) {
+	    /* first scan of this coefficient */
+	    if (Ah != 0)
+	      ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
+	  } else {
+	    /* not first scan */
+	    if (Ah != last_bitpos_ptr[coefi] || Al != Ah-1)
+	      ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
+	  }
+	  last_bitpos_ptr[coefi] = Al;
+	}
+      }
+#endif
+    } else {
+      /* For sequential JPEG, all progression parameters must be these: */
+      if (Ss != 0 || Se != DCTSIZE2-1 || Ah != 0 || Al != 0)
+	ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
+      /* Make sure components are not sent twice */
+      for (ci = 0; ci < ncomps; ci++) {
+	thisi = scanptr->component_index[ci];
+	if (component_sent[thisi])
+	  ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno);
+	component_sent[thisi] = TRUE;
+      }
+    }
+  }
+
+  /* Now verify that everything got sent. */
+  if (cinfo->progressive_mode) {
+#ifdef C_PROGRESSIVE_SUPPORTED
+    /* For progressive mode, we only check that at least some DC data
+     * got sent for each component; the spec does not require that all bits
+     * of all coefficients be transmitted.  Would it be wiser to enforce
+     * transmission of all coefficient bits??
+     */
+    for (ci = 0; ci < cinfo->num_components; ci++) {
+      if (last_bitpos[ci][0] < 0)
+	ERREXIT(cinfo, JERR_MISSING_DATA);
+    }
+#endif
+  } else {
+    for (ci = 0; ci < cinfo->num_components; ci++) {
+      if (! component_sent[ci])
+	ERREXIT(cinfo, JERR_MISSING_DATA);
+    }
+  }
+}
+
+#endif /* C_MULTISCAN_FILES_SUPPORTED */
+
+
+LOCAL(void)
+select_scan_parameters (j_compress_ptr cinfo)
+/* Set up the scan parameters for the current scan */
+{
+  int ci;
+
+#ifdef C_MULTISCAN_FILES_SUPPORTED
+  if (cinfo->scan_info != NULL) {
+    /* Prepare for current scan --- the script is already validated */
+    my_master_ptr master = (my_master_ptr) cinfo->master;
+    const jpeg_scan_info * scanptr = cinfo->scan_info + master->scan_number;
+
+    cinfo->comps_in_scan = scanptr->comps_in_scan;
+    for (ci = 0; ci < scanptr->comps_in_scan; ci++) {
+      cinfo->cur_comp_info[ci] =
+	&cinfo->comp_info[scanptr->component_index[ci]];
+    }
+    cinfo->Ss = scanptr->Ss;
+    cinfo->Se = scanptr->Se;
+    cinfo->Ah = scanptr->Ah;
+    cinfo->Al = scanptr->Al;
+  }
+  else
+#endif
+  {
+    /* Prepare for single sequential-JPEG scan containing all components */
+    if (cinfo->num_components > MAX_COMPS_IN_SCAN)
+      ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components,
+	       MAX_COMPS_IN_SCAN);
+    cinfo->comps_in_scan = cinfo->num_components;
+    for (ci = 0; ci < cinfo->num_components; ci++) {
+      cinfo->cur_comp_info[ci] = &cinfo->comp_info[ci];
+    }
+    cinfo->Ss = 0;
+    cinfo->Se = DCTSIZE2-1;
+    cinfo->Ah = 0;
+    cinfo->Al = 0;
+  }
+}
+
+
+LOCAL(void)
+per_scan_setup (j_compress_ptr cinfo)
+/* Do computations that are needed before processing a JPEG scan */
+/* cinfo->comps_in_scan and cinfo->cur_comp_info[] are already set */
+{
+  int ci, mcublks, tmp;
+  jpeg_component_info *compptr;
+  
+  if (cinfo->comps_in_scan == 1) {
+    
+    /* Noninterleaved (single-component) scan */
+    compptr = cinfo->cur_comp_info[0];
+    
+    /* Overall image size in MCUs */
+    cinfo->MCUs_per_row = compptr->width_in_blocks;
+    cinfo->MCU_rows_in_scan = compptr->height_in_blocks;
+    
+    /* For noninterleaved scan, always one block per MCU */
+    compptr->MCU_width = 1;
+    compptr->MCU_height = 1;
+    compptr->MCU_blocks = 1;
+    compptr->MCU_sample_width = DCTSIZE;
+    compptr->last_col_width = 1;
+    /* For noninterleaved scans, it is convenient to define last_row_height
+     * as the number of block rows present in the last iMCU row.
+     */
+    tmp = (int) (compptr->height_in_blocks % compptr->v_samp_factor);
+    if (tmp == 0) tmp = compptr->v_samp_factor;
+    compptr->last_row_height = tmp;
+    
+    /* Prepare array describing MCU composition */
+    cinfo->blocks_in_MCU = 1;
+    cinfo->MCU_membership[0] = 0;
+    
+  } else {
+    
+    /* Interleaved (multi-component) scan */
+    if (cinfo->comps_in_scan <= 0 || cinfo->comps_in_scan > MAX_COMPS_IN_SCAN)
+      ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->comps_in_scan,
+	       MAX_COMPS_IN_SCAN);
+    
+    /* Overall image size in MCUs */
+    cinfo->MCUs_per_row = (JDIMENSION)
+      jdiv_round_up((long) cinfo->_jpeg_width,
+		    (long) (cinfo->max_h_samp_factor*DCTSIZE));
+    cinfo->MCU_rows_in_scan = (JDIMENSION)
+      jdiv_round_up((long) cinfo->_jpeg_height,
+		    (long) (cinfo->max_v_samp_factor*DCTSIZE));
+    
+    cinfo->blocks_in_MCU = 0;
+    
+    for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
+      compptr = cinfo->cur_comp_info[ci];
+      /* Sampling factors give # of blocks of component in each MCU */
+      compptr->MCU_width = compptr->h_samp_factor;
+      compptr->MCU_height = compptr->v_samp_factor;
+      compptr->MCU_blocks = compptr->MCU_width * compptr->MCU_height;
+      compptr->MCU_sample_width = compptr->MCU_width * DCTSIZE;
+      /* Figure number of non-dummy blocks in last MCU column & row */
+      tmp = (int) (compptr->width_in_blocks % compptr->MCU_width);
+      if (tmp == 0) tmp = compptr->MCU_width;
+      compptr->last_col_width = tmp;
+      tmp = (int) (compptr->height_in_blocks % compptr->MCU_height);
+      if (tmp == 0) tmp = compptr->MCU_height;
+      compptr->last_row_height = tmp;
+      /* Prepare array describing MCU composition */
+      mcublks = compptr->MCU_blocks;
+      if (cinfo->blocks_in_MCU + mcublks > C_MAX_BLOCKS_IN_MCU)
+	ERREXIT(cinfo, JERR_BAD_MCU_SIZE);
+      while (mcublks-- > 0) {
+	cinfo->MCU_membership[cinfo->blocks_in_MCU++] = ci;
+      }
+    }
+    
+  }
+
+  /* Convert restart specified in rows to actual MCU count. */
+  /* Note that count must fit in 16 bits, so we provide limiting. */
+  if (cinfo->restart_in_rows > 0) {
+    long nominal = (long) cinfo->restart_in_rows * (long) cinfo->MCUs_per_row;
+    cinfo->restart_interval = (unsigned int) MIN(nominal, 65535L);
+  }
+}
+
+
+/*
+ * Per-pass setup.
+ * This is called at the beginning of each pass.  We determine which modules
+ * will be active during this pass and give them appropriate start_pass calls.
+ * We also set is_last_pass to indicate whether any more passes will be
+ * required.
+ */
+
+METHODDEF(void)
+prepare_for_pass (j_compress_ptr cinfo)
+{
+  my_master_ptr master = (my_master_ptr) cinfo->master;
+
+  switch (master->pass_type) {
+  case main_pass:
+    /* Initial pass: will collect input data, and do either Huffman
+     * optimization or data output for the first scan.
+     */
+    select_scan_parameters(cinfo);
+    per_scan_setup(cinfo);
+    if (! cinfo->raw_data_in) {
+      (*cinfo->cconvert->start_pass) (cinfo);
+      (*cinfo->downsample->start_pass) (cinfo);
+      (*cinfo->prep->start_pass) (cinfo, JBUF_PASS_THRU);
+    }
+    (*cinfo->fdct->start_pass) (cinfo);
+    (*cinfo->entropy->start_pass) (cinfo, cinfo->optimize_coding);
+    (*cinfo->coef->start_pass) (cinfo,
+				(master->total_passes > 1 ?
+				 JBUF_SAVE_AND_PASS : JBUF_PASS_THRU));
+    (*cinfo->main->start_pass) (cinfo, JBUF_PASS_THRU);
+    if (cinfo->optimize_coding) {
+      /* No immediate data output; postpone writing frame/scan headers */
+      master->pub.call_pass_startup = FALSE;
+    } else {
+      /* Will write frame/scan headers at first jpeg_write_scanlines call */
+      master->pub.call_pass_startup = TRUE;
+    }
+    break;
+#ifdef ENTROPY_OPT_SUPPORTED
+  case huff_opt_pass:
+    /* Do Huffman optimization for a scan after the first one. */
+    select_scan_parameters(cinfo);
+    per_scan_setup(cinfo);
+    if (cinfo->Ss != 0 || cinfo->Ah == 0 || cinfo->arith_code) {
+      (*cinfo->entropy->start_pass) (cinfo, TRUE);
+      (*cinfo->coef->start_pass) (cinfo, JBUF_CRANK_DEST);
+      master->pub.call_pass_startup = FALSE;
+      break;
+    }
+    /* Special case: Huffman DC refinement scans need no Huffman table
+     * and therefore we can skip the optimization pass for them.
+     */
+    master->pass_type = output_pass;
+    master->pass_number++;
+    /*FALLTHROUGH*/
+#endif
+  case output_pass:
+    /* Do a data-output pass. */
+    /* We need not repeat per-scan setup if prior optimization pass did it. */
+    if (! cinfo->optimize_coding) {
+      select_scan_parameters(cinfo);
+      per_scan_setup(cinfo);
+    }
+    (*cinfo->entropy->start_pass) (cinfo, FALSE);
+    (*cinfo->coef->start_pass) (cinfo, JBUF_CRANK_DEST);
+    /* We emit frame/scan headers now */
+    if (master->scan_number == 0)
+      (*cinfo->marker->write_frame_header) (cinfo);
+    (*cinfo->marker->write_scan_header) (cinfo);
+    master->pub.call_pass_startup = FALSE;
+    break;
+  default:
+    ERREXIT(cinfo, JERR_NOT_COMPILED);
+  }
+
+  master->pub.is_last_pass = (master->pass_number == master->total_passes-1);
+
+  /* Set up progress monitor's pass info if present */
+  if (cinfo->progress != NULL) {
+    cinfo->progress->completed_passes = master->pass_number;
+    cinfo->progress->total_passes = master->total_passes;
+  }
+}
+
+
+/*
+ * Special start-of-pass hook.
+ * This is called by jpeg_write_scanlines if call_pass_startup is TRUE.
+ * In single-pass processing, we need this hook because we don't want to
+ * write frame/scan headers during jpeg_start_compress; we want to let the
+ * application write COM markers etc. between jpeg_start_compress and the
+ * jpeg_write_scanlines loop.
+ * In multi-pass processing, this routine is not used.
+ */
+
+METHODDEF(void)
+pass_startup (j_compress_ptr cinfo)
+{
+  cinfo->master->call_pass_startup = FALSE; /* reset flag so call only once */
+
+  (*cinfo->marker->write_frame_header) (cinfo);
+  (*cinfo->marker->write_scan_header) (cinfo);
+}
+
+
+/*
+ * Finish up at end of pass.
+ */
+
+METHODDEF(void)
+finish_pass_master (j_compress_ptr cinfo)
+{
+  my_master_ptr master = (my_master_ptr) cinfo->master;
+
+  /* The entropy coder always needs an end-of-pass call,
+   * either to analyze statistics or to flush its output buffer.
+   */
+  (*cinfo->entropy->finish_pass) (cinfo);
+
+  /* Update state for next pass */
+  switch (master->pass_type) {
+  case main_pass:
+    /* next pass is either output of scan 0 (after optimization)
+     * or output of scan 1 (if no optimization).
+     */
+    master->pass_type = output_pass;
+    if (! cinfo->optimize_coding)
+      master->scan_number++;
+    break;
+  case huff_opt_pass:
+    /* next pass is always output of current scan */
+    master->pass_type = output_pass;
+    break;
+  case output_pass:
+    /* next pass is either optimization or output of next scan */
+    if (cinfo->optimize_coding)
+      master->pass_type = huff_opt_pass;
+    master->scan_number++;
+    break;
+  }
+
+  master->pass_number++;
+}
+
+
+/*
+ * Initialize master compression control.
+ */
+
+GLOBAL(void)
+jinit_c_master_control (j_compress_ptr cinfo, boolean transcode_only)
+{
+  my_master_ptr master;
+
+  master = (my_master_ptr)
+      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				  SIZEOF(my_comp_master));
+  cinfo->master = (struct jpeg_comp_master *) master;
+  master->pub.prepare_for_pass = prepare_for_pass;
+  master->pub.pass_startup = pass_startup;
+  master->pub.finish_pass = finish_pass_master;
+  master->pub.is_last_pass = FALSE;
+
+  /* Validate parameters, determine derived values */
+  initial_setup(cinfo, transcode_only);
+
+  if (cinfo->scan_info != NULL) {
+#ifdef C_MULTISCAN_FILES_SUPPORTED
+    validate_script(cinfo);
+#else
+    ERREXIT(cinfo, JERR_NOT_COMPILED);
+#endif
+  } else {
+    cinfo->progressive_mode = FALSE;
+    cinfo->num_scans = 1;
+  }
+
+  if (cinfo->progressive_mode)	/*  TEMPORARY HACK ??? */
+    cinfo->optimize_coding = TRUE; /* assume default tables no good for progressive mode */
+
+  /* Initialize my private state */
+  if (transcode_only) {
+    /* no main pass in transcoding */
+    if (cinfo->optimize_coding)
+      master->pass_type = huff_opt_pass;
+    else
+      master->pass_type = output_pass;
+  } else {
+    /* for normal compression, first pass is always this type: */
+    master->pass_type = main_pass;
+  }
+  master->scan_number = 0;
+  master->pass_number = 0;
+  if (cinfo->optimize_coding)
+    master->total_passes = cinfo->num_scans * 2;
+  else
+    master->total_passes = cinfo->num_scans;
+}
diff --git a/src/libjpeg-turbo/jcomapi.c b/src/libjpeg-turbo/jcomapi.c
new file mode 100644
index 0000000..9b1fa75
--- /dev/null
+++ b/src/libjpeg-turbo/jcomapi.c
@@ -0,0 +1,106 @@
+/*
+ * jcomapi.c
+ *
+ * Copyright (C) 1994-1997, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains application interface routines that are used for both
+ * compression and decompression.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+
+
+/*
+ * Abort processing of a JPEG compression or decompression operation,
+ * but don't destroy the object itself.
+ *
+ * For this, we merely clean up all the nonpermanent memory pools.
+ * Note that temp files (virtual arrays) are not allowed to belong to
+ * the permanent pool, so we will be able to close all temp files here.
+ * Closing a data source or destination, if necessary, is the application's
+ * responsibility.
+ */
+
+GLOBAL(void)
+jpeg_abort (j_common_ptr cinfo)
+{
+  int pool;
+
+  /* Do nothing if called on a not-initialized or destroyed JPEG object. */
+  if (cinfo->mem == NULL)
+    return;
+
+  /* Releasing pools in reverse order might help avoid fragmentation
+   * with some (brain-damaged) malloc libraries.
+   */
+  for (pool = JPOOL_NUMPOOLS-1; pool > JPOOL_PERMANENT; pool--) {
+    (*cinfo->mem->free_pool) (cinfo, pool);
+  }
+
+  /* Reset overall state for possible reuse of object */
+  if (cinfo->is_decompressor) {
+    cinfo->global_state = DSTATE_START;
+    /* Try to keep application from accessing now-deleted marker list.
+     * A bit kludgy to do it here, but this is the most central place.
+     */
+    ((j_decompress_ptr) cinfo)->marker_list = NULL;
+  } else {
+    cinfo->global_state = CSTATE_START;
+  }
+}
+
+
+/*
+ * Destruction of a JPEG object.
+ *
+ * Everything gets deallocated except the master jpeg_compress_struct itself
+ * and the error manager struct.  Both of these are supplied by the application
+ * and must be freed, if necessary, by the application.  (Often they are on
+ * the stack and so don't need to be freed anyway.)
+ * Closing a data source or destination, if necessary, is the application's
+ * responsibility.
+ */
+
+GLOBAL(void)
+jpeg_destroy (j_common_ptr cinfo)
+{
+  /* We need only tell the memory manager to release everything. */
+  /* NB: mem pointer is NULL if memory mgr failed to initialize. */
+  if (cinfo->mem != NULL)
+    (*cinfo->mem->self_destruct) (cinfo);
+  cinfo->mem = NULL;		/* be safe if jpeg_destroy is called twice */
+  cinfo->global_state = 0;	/* mark it destroyed */
+}
+
+
+/*
+ * Convenience routines for allocating quantization and Huffman tables.
+ * (Would jutils.c be a more reasonable place to put these?)
+ */
+
+GLOBAL(JQUANT_TBL *)
+jpeg_alloc_quant_table (j_common_ptr cinfo)
+{
+  JQUANT_TBL *tbl;
+
+  tbl = (JQUANT_TBL *)
+    (*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JQUANT_TBL));
+  tbl->sent_table = FALSE;	/* make sure this is false in any new table */
+  return tbl;
+}
+
+
+GLOBAL(JHUFF_TBL *)
+jpeg_alloc_huff_table (j_common_ptr cinfo)
+{
+  JHUFF_TBL *tbl;
+
+  tbl = (JHUFF_TBL *)
+    (*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JHUFF_TBL));
+  tbl->sent_table = FALSE;	/* make sure this is false in any new table */
+  return tbl;
+}
diff --git a/src/libjpeg-turbo/jconfig.h b/src/libjpeg-turbo/jconfig.h
new file mode 100644
index 0000000..4cd0fa0
--- /dev/null
+++ b/src/libjpeg-turbo/jconfig.h
@@ -0,0 +1,58 @@
+/* jconfig.h.  Generated from jconfig.h.in by configure.  */
+/* Version ID for the JPEG library.
+ * Might be useful for tests like "#if JPEG_LIB_VERSION >= 60".
+ */
+#define JPEG_LIB_VERSION 62
+
+/* libjpeg-turbo version */
+#define LIBJPEG_TURBO_VERSION 1.2.0
+
+/* Support arithmetic encoding */
+#define C_ARITH_CODING_SUPPORTED 1
+
+/* Support arithmetic decoding */
+#define D_ARITH_CODING_SUPPORTED 1
+
+/* Compiler supports function prototypes. */
+#define HAVE_PROTOTYPES 1
+
+/* Define to 1 if you have the <stddef.h> header file. */
+#define HAVE_STDDEF_H 1
+
+/* Define to 1 if you have the <stdlib.h> header file. */
+#define HAVE_STDLIB_H 1
+
+/* Compiler supports 'unsigned char'. */
+#define HAVE_UNSIGNED_CHAR 1
+
+/* Compiler supports 'unsigned short'. */
+#define HAVE_UNSIGNED_SHORT 1
+
+/* Compiler does not support pointers to unspecified structures. */
+/* #undef INCOMPLETE_TYPES_BROKEN */
+
+/* Compiler has <strings.h> rather than standard <string.h>. */
+/* #undef NEED_BSD_STRINGS */
+
+/* Linker requires that global names be unique in first 15 characters. */
+/* #undef NEED_SHORT_EXTERNAL_NAMES */
+
+/* Need to include <sys/types.h> in order to obtain size_t. */
+#define NEED_SYS_TYPES_H 1
+
+/* Broken compiler shifts signed values as an unsigned shift. */
+/* #undef RIGHT_SHIFT_IS_UNSIGNED */
+
+/* Use accelerated SIMD routines. */
+#define WITH_SIMD 1
+
+/* Define to 1 if type `char' is unsigned and you are not using gcc.  */
+#ifndef __CHAR_UNSIGNED__
+/* # undef __CHAR_UNSIGNED__ */
+#endif
+
+/* Define to empty if `const' does not conform to ANSI C. */
+/* #undef const */
+
+/* Define to `unsigned int' if <sys/types.h> does not define. */
+/* #undef size_t */
diff --git a/src/libjpeg-turbo/jcparam.c b/src/libjpeg-turbo/jcparam.c
new file mode 100644
index 0000000..557fdc9
--- /dev/null
+++ b/src/libjpeg-turbo/jcparam.c
@@ -0,0 +1,649 @@
+/*
+ * jcparam.c
+ *
+ * Copyright (C) 1991-1998, Thomas G. Lane.
+ * Modified 2003-2008 by Guido Vollbeding.
+ * Copyright (C) 2009-2011, D. R. Commander.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains optional default-setting code for the JPEG compressor.
+ * Applications do not have to use this file, but those that don't use it
+ * must know a lot more about the innards of the JPEG code.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+
+
+/*
+ * Quantization table setup routines
+ */
+
+GLOBAL(void)
+jpeg_add_quant_table (j_compress_ptr cinfo, int which_tbl,
+		      const unsigned int *basic_table,
+		      int scale_factor, boolean force_baseline)
+/* Define a quantization table equal to the basic_table times
+ * a scale factor (given as a percentage).
+ * If force_baseline is TRUE, the computed quantization table entries
+ * are limited to 1..255 for JPEG baseline compatibility.
+ */
+{
+  JQUANT_TBL ** qtblptr;
+  int i;
+  long temp;
+
+  /* Safety check to ensure start_compress not called yet. */
+  if (cinfo->global_state != CSTATE_START)
+    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
+
+  if (which_tbl < 0 || which_tbl >= NUM_QUANT_TBLS)
+    ERREXIT1(cinfo, JERR_DQT_INDEX, which_tbl);
+
+  qtblptr = & cinfo->quant_tbl_ptrs[which_tbl];
+
+  if (*qtblptr == NULL)
+    *qtblptr = jpeg_alloc_quant_table((j_common_ptr) cinfo);
+
+  for (i = 0; i < DCTSIZE2; i++) {
+    temp = ((long) basic_table[i] * scale_factor + 50L) / 100L;
+    /* limit the values to the valid range */
+    if (temp <= 0L) temp = 1L;
+    if (temp > 32767L) temp = 32767L; /* max quantizer needed for 12 bits */
+    if (force_baseline && temp > 255L)
+      temp = 255L;		/* limit to baseline range if requested */
+    (*qtblptr)->quantval[i] = (UINT16) temp;
+  }
+
+  /* Initialize sent_table FALSE so table will be written to JPEG file. */
+  (*qtblptr)->sent_table = FALSE;
+}
+
+
+/* These are the sample quantization tables given in JPEG spec section K.1.
+ * The spec says that the values given produce "good" quality, and
+ * when divided by 2, "very good" quality.
+ */
+static const unsigned int std_luminance_quant_tbl[DCTSIZE2] = {
+  16,  11,  10,  16,  24,  40,  51,  61,
+  12,  12,  14,  19,  26,  58,  60,  55,
+  14,  13,  16,  24,  40,  57,  69,  56,
+  14,  17,  22,  29,  51,  87,  80,  62,
+  18,  22,  37,  56,  68, 109, 103,  77,
+  24,  35,  55,  64,  81, 104, 113,  92,
+  49,  64,  78,  87, 103, 121, 120, 101,
+  72,  92,  95,  98, 112, 100, 103,  99
+};
+static const unsigned int std_chrominance_quant_tbl[DCTSIZE2] = {
+  17,  18,  24,  47,  99,  99,  99,  99,
+  18,  21,  26,  66,  99,  99,  99,  99,
+  24,  26,  56,  99,  99,  99,  99,  99,
+  47,  66,  99,  99,  99,  99,  99,  99,
+  99,  99,  99,  99,  99,  99,  99,  99,
+  99,  99,  99,  99,  99,  99,  99,  99,
+  99,  99,  99,  99,  99,  99,  99,  99,
+  99,  99,  99,  99,  99,  99,  99,  99
+};
+
+
+#if JPEG_LIB_VERSION >= 70
+GLOBAL(void)
+jpeg_default_qtables (j_compress_ptr cinfo, boolean force_baseline)
+/* Set or change the 'quality' (quantization) setting, using default tables
+ * and straight percentage-scaling quality scales.
+ * This entry point allows different scalings for luminance and chrominance.
+ */
+{
+  /* Set up two quantization tables using the specified scaling */
+  jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl,
+		       cinfo->q_scale_factor[0], force_baseline);
+  jpeg_add_quant_table(cinfo, 1, std_chrominance_quant_tbl,
+		       cinfo->q_scale_factor[1], force_baseline);
+}
+#endif
+
+
+GLOBAL(void)
+jpeg_set_linear_quality (j_compress_ptr cinfo, int scale_factor,
+			 boolean force_baseline)
+/* Set or change the 'quality' (quantization) setting, using default tables
+ * and a straight percentage-scaling quality scale.  In most cases it's better
+ * to use jpeg_set_quality (below); this entry point is provided for
+ * applications that insist on a linear percentage scaling.
+ */
+{
+  /* Set up two quantization tables using the specified scaling */
+  jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl,
+		       scale_factor, force_baseline);
+  jpeg_add_quant_table(cinfo, 1, std_chrominance_quant_tbl,
+		       scale_factor, force_baseline);
+}
+
+
+GLOBAL(int)
+jpeg_quality_scaling (int quality)
+/* Convert a user-specified quality rating to a percentage scaling factor
+ * for an underlying quantization table, using our recommended scaling curve.
+ * The input 'quality' factor should be 0 (terrible) to 100 (very good).
+ */
+{
+  /* Safety limit on quality factor.  Convert 0 to 1 to avoid zero divide. */
+  if (quality <= 0) quality = 1;
+  if (quality > 100) quality = 100;
+
+  /* The basic table is used as-is (scaling 100) for a quality of 50.
+   * Qualities 50..100 are converted to scaling percentage 200 - 2*Q;
+   * note that at Q=100 the scaling is 0, which will cause jpeg_add_quant_table
+   * to make all the table entries 1 (hence, minimum quantization loss).
+   * Qualities 1..50 are converted to scaling percentage 5000/Q.
+   */
+  if (quality < 50)
+    quality = 5000 / quality;
+  else
+    quality = 200 - quality*2;
+
+  return quality;
+}
+
+
+GLOBAL(void)
+jpeg_set_quality (j_compress_ptr cinfo, int quality, boolean force_baseline)
+/* Set or change the 'quality' (quantization) setting, using default tables.
+ * This is the standard quality-adjusting entry point for typical user
+ * interfaces; only those who want detailed control over quantization tables
+ * would use the preceding three routines directly.
+ */
+{
+  /* Convert user 0-100 rating to percentage scaling */
+  quality = jpeg_quality_scaling(quality);
+
+  /* Set up standard quality tables */
+  jpeg_set_linear_quality(cinfo, quality, force_baseline);
+}
+
+
+/*
+ * Huffman table setup routines
+ */
+
+LOCAL(void)
+add_huff_table (j_compress_ptr cinfo,
+		JHUFF_TBL **htblptr, const UINT8 *bits, const UINT8 *val)
+/* Define a Huffman table */
+{
+  int nsymbols, len;
+
+  if (*htblptr == NULL)
+    *htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo);
+
+  /* Copy the number-of-symbols-of-each-code-length counts */
+  MEMCOPY((*htblptr)->bits, bits, SIZEOF((*htblptr)->bits));
+
+  /* Validate the counts.  We do this here mainly so we can copy the right
+   * number of symbols from the val[] array, without risking marching off
+   * the end of memory.  jchuff.c will do a more thorough test later.
+   */
+  nsymbols = 0;
+  for (len = 1; len <= 16; len++)
+    nsymbols += bits[len];
+  if (nsymbols < 1 || nsymbols > 256)
+    ERREXIT(cinfo, JERR_BAD_HUFF_TABLE);
+
+  MEMCOPY((*htblptr)->huffval, val, nsymbols * SIZEOF(UINT8));
+
+  /* Initialize sent_table FALSE so table will be written to JPEG file. */
+  (*htblptr)->sent_table = FALSE;
+}
+
+
+LOCAL(void)
+std_huff_tables (j_compress_ptr cinfo)
+/* Set up the standard Huffman tables (cf. JPEG standard section K.3) */
+/* IMPORTANT: these are only valid for 8-bit data precision! */
+{
+  static const UINT8 bits_dc_luminance[17] =
+    { /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 };
+  static const UINT8 val_dc_luminance[] =
+    { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
+  
+  static const UINT8 bits_dc_chrominance[17] =
+    { /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 };
+  static const UINT8 val_dc_chrominance[] =
+    { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
+  
+  static const UINT8 bits_ac_luminance[17] =
+    { /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d };
+  static const UINT8 val_ac_luminance[] =
+    { 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
+      0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
+      0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
+      0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
+      0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
+      0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
+      0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
+      0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
+      0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
+      0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
+      0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
+      0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
+      0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
+      0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
+      0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
+      0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
+      0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
+      0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
+      0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
+      0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
+      0xf9, 0xfa };
+  
+  static const UINT8 bits_ac_chrominance[17] =
+    { /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 };
+  static const UINT8 val_ac_chrominance[] =
+    { 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
+      0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
+      0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
+      0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
+      0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
+      0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
+      0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
+      0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
+      0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
+      0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
+      0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
+      0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
+      0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
+      0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
+      0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
+      0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
+      0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
+      0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
+      0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
+      0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
+      0xf9, 0xfa };
+  
+  add_huff_table(cinfo, &cinfo->dc_huff_tbl_ptrs[0],
+		 bits_dc_luminance, val_dc_luminance);
+  add_huff_table(cinfo, &cinfo->ac_huff_tbl_ptrs[0],
+		 bits_ac_luminance, val_ac_luminance);
+  add_huff_table(cinfo, &cinfo->dc_huff_tbl_ptrs[1],
+		 bits_dc_chrominance, val_dc_chrominance);
+  add_huff_table(cinfo, &cinfo->ac_huff_tbl_ptrs[1],
+		 bits_ac_chrominance, val_ac_chrominance);
+}
+
+
+/*
+ * Default parameter setup for compression.
+ *
+ * Applications that don't choose to use this routine must do their
+ * own setup of all these parameters.  Alternately, you can call this
+ * to establish defaults and then alter parameters selectively.  This
+ * is the recommended approach since, if we add any new parameters,
+ * your code will still work (they'll be set to reasonable defaults).
+ */
+
+GLOBAL(void)
+jpeg_set_defaults (j_compress_ptr cinfo)
+{
+  int i;
+
+  /* Safety check to ensure start_compress not called yet. */
+  if (cinfo->global_state != CSTATE_START)
+    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
+
+  /* Allocate comp_info array large enough for maximum component count.
+   * Array is made permanent in case application wants to compress
+   * multiple images at same param settings.
+   */
+  if (cinfo->comp_info == NULL)
+    cinfo->comp_info = (jpeg_component_info *)
+      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
+				  MAX_COMPONENTS * SIZEOF(jpeg_component_info));
+
+  /* Initialize everything not dependent on the color space */
+
+#if JPEG_LIB_VERSION >= 70
+  cinfo->scale_num = 1;		/* 1:1 scaling */
+  cinfo->scale_denom = 1;
+#endif
+  cinfo->data_precision = BITS_IN_JSAMPLE;
+  /* Set up two quantization tables using default quality of 75 */
+  jpeg_set_quality(cinfo, 75, TRUE);
+  /* Set up two Huffman tables */
+  std_huff_tables(cinfo);
+
+  /* Initialize default arithmetic coding conditioning */
+  for (i = 0; i < NUM_ARITH_TBLS; i++) {
+    cinfo->arith_dc_L[i] = 0;
+    cinfo->arith_dc_U[i] = 1;
+    cinfo->arith_ac_K[i] = 5;
+  }
+
+  /* Default is no multiple-scan output */
+  cinfo->scan_info = NULL;
+  cinfo->num_scans = 0;
+
+  /* Expect normal source image, not raw downsampled data */
+  cinfo->raw_data_in = FALSE;
+
+  /* Use Huffman coding, not arithmetic coding, by default */
+  cinfo->arith_code = FALSE;
+
+  /* By default, don't do extra passes to optimize entropy coding */
+  cinfo->optimize_coding = FALSE;
+  /* The standard Huffman tables are only valid for 8-bit data precision.
+   * If the precision is higher, force optimization on so that usable
+   * tables will be computed.  This test can be removed if default tables
+   * are supplied that are valid for the desired precision.
+   */
+  if (cinfo->data_precision > 8)
+    cinfo->optimize_coding = TRUE;
+
+  /* By default, use the simpler non-cosited sampling alignment */
+  cinfo->CCIR601_sampling = FALSE;
+
+#if JPEG_LIB_VERSION >= 70
+  /* By default, apply fancy downsampling */
+  cinfo->do_fancy_downsampling = TRUE;
+#endif
+
+  /* No input smoothing */
+  cinfo->smoothing_factor = 0;
+
+  /* DCT algorithm preference */
+  cinfo->dct_method = JDCT_DEFAULT;
+
+  /* No restart markers */
+  cinfo->restart_interval = 0;
+  cinfo->restart_in_rows = 0;
+
+  /* Fill in default JFIF marker parameters.  Note that whether the marker
+   * will actually be written is determined by jpeg_set_colorspace.
+   *
+   * By default, the library emits JFIF version code 1.01.
+   * An application that wants to emit JFIF 1.02 extension markers should set
+   * JFIF_minor_version to 2.  We could probably get away with just defaulting
+   * to 1.02, but there may still be some decoders in use that will complain
+   * about that; saying 1.01 should minimize compatibility problems.
+   */
+  cinfo->JFIF_major_version = 1; /* Default JFIF version = 1.01 */
+  cinfo->JFIF_minor_version = 1;
+  cinfo->density_unit = 0;	/* Pixel size is unknown by default */
+  cinfo->X_density = 1;		/* Pixel aspect ratio is square by default */
+  cinfo->Y_density = 1;
+
+  /* Choose JPEG colorspace based on input space, set defaults accordingly */
+
+  jpeg_default_colorspace(cinfo);
+}
+
+
+/*
+ * Select an appropriate JPEG colorspace for in_color_space.
+ */
+
+GLOBAL(void)
+jpeg_default_colorspace (j_compress_ptr cinfo)
+{
+  switch (cinfo->in_color_space) {
+  case JCS_GRAYSCALE:
+    jpeg_set_colorspace(cinfo, JCS_GRAYSCALE);
+    break;
+  case JCS_RGB:
+  case JCS_EXT_RGB:
+  case JCS_EXT_RGBX:
+  case JCS_EXT_BGR:
+  case JCS_EXT_BGRX:
+  case JCS_EXT_XBGR:
+  case JCS_EXT_XRGB:
+  case JCS_EXT_RGBA:
+  case JCS_EXT_BGRA:
+  case JCS_EXT_ABGR:
+  case JCS_EXT_ARGB:
+    jpeg_set_colorspace(cinfo, JCS_YCbCr);
+    break;
+  case JCS_YCbCr:
+    jpeg_set_colorspace(cinfo, JCS_YCbCr);
+    break;
+  case JCS_CMYK:
+    jpeg_set_colorspace(cinfo, JCS_CMYK); /* By default, no translation */
+    break;
+  case JCS_YCCK:
+    jpeg_set_colorspace(cinfo, JCS_YCCK);
+    break;
+  case JCS_UNKNOWN:
+    jpeg_set_colorspace(cinfo, JCS_UNKNOWN);
+    break;
+  default:
+    ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
+  }
+}
+
+
+/*
+ * Set the JPEG colorspace, and choose colorspace-dependent default values.
+ */
+
+GLOBAL(void)
+jpeg_set_colorspace (j_compress_ptr cinfo, J_COLOR_SPACE colorspace)
+{
+  jpeg_component_info * compptr;
+  int ci;
+
+#define SET_COMP(index,id,hsamp,vsamp,quant,dctbl,actbl)  \
+  (compptr = &cinfo->comp_info[index], \
+   compptr->component_id = (id), \
+   compptr->h_samp_factor = (hsamp), \
+   compptr->v_samp_factor = (vsamp), \
+   compptr->quant_tbl_no = (quant), \
+   compptr->dc_tbl_no = (dctbl), \
+   compptr->ac_tbl_no = (actbl) )
+
+  /* Safety check to ensure start_compress not called yet. */
+  if (cinfo->global_state != CSTATE_START)
+    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
+
+  /* For all colorspaces, we use Q and Huff tables 0 for luminance components,
+   * tables 1 for chrominance components.
+   */
+
+  cinfo->jpeg_color_space = colorspace;
+
+  cinfo->write_JFIF_header = FALSE; /* No marker for non-JFIF colorspaces */
+  cinfo->write_Adobe_marker = FALSE; /* write no Adobe marker by default */
+
+  switch (colorspace) {
+  case JCS_GRAYSCALE:
+    cinfo->write_JFIF_header = TRUE; /* Write a JFIF marker */
+    cinfo->num_components = 1;
+    /* JFIF specifies component ID 1 */
+    SET_COMP(0, 1, 1,1, 0, 0,0);
+    break;
+  case JCS_RGB:
+    cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag RGB */
+    cinfo->num_components = 3;
+    SET_COMP(0, 0x52 /* 'R' */, 1,1, 0, 0,0);
+    SET_COMP(1, 0x47 /* 'G' */, 1,1, 0, 0,0);
+    SET_COMP(2, 0x42 /* 'B' */, 1,1, 0, 0,0);
+    break;
+  case JCS_YCbCr:
+    cinfo->write_JFIF_header = TRUE; /* Write a JFIF marker */
+    cinfo->num_components = 3;
+    /* JFIF specifies component IDs 1,2,3 */
+    /* We default to 2x2 subsamples of chrominance */
+    SET_COMP(0, 1, 2,2, 0, 0,0);
+    SET_COMP(1, 2, 1,1, 1, 1,1);
+    SET_COMP(2, 3, 1,1, 1, 1,1);
+    break;
+  case JCS_CMYK:
+    cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag CMYK */
+    cinfo->num_components = 4;
+    SET_COMP(0, 0x43 /* 'C' */, 1,1, 0, 0,0);
+    SET_COMP(1, 0x4D /* 'M' */, 1,1, 0, 0,0);
+    SET_COMP(2, 0x59 /* 'Y' */, 1,1, 0, 0,0);
+    SET_COMP(3, 0x4B /* 'K' */, 1,1, 0, 0,0);
+    break;
+  case JCS_YCCK:
+    cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag YCCK */
+    cinfo->num_components = 4;
+    SET_COMP(0, 1, 2,2, 0, 0,0);
+    SET_COMP(1, 2, 1,1, 1, 1,1);
+    SET_COMP(2, 3, 1,1, 1, 1,1);
+    SET_COMP(3, 4, 2,2, 0, 0,0);
+    break;
+  case JCS_UNKNOWN:
+    cinfo->num_components = cinfo->input_components;
+    if (cinfo->num_components < 1 || cinfo->num_components > MAX_COMPONENTS)
+      ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components,
+	       MAX_COMPONENTS);
+    for (ci = 0; ci < cinfo->num_components; ci++) {
+      SET_COMP(ci, ci, 1,1, 0, 0,0);
+    }
+    break;
+  default:
+    ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
+  }
+}
+
+
+#ifdef C_PROGRESSIVE_SUPPORTED
+
+LOCAL(jpeg_scan_info *)
+fill_a_scan (jpeg_scan_info * scanptr, int ci,
+	     int Ss, int Se, int Ah, int Al)
+/* Support routine: generate one scan for specified component */
+{
+  scanptr->comps_in_scan = 1;
+  scanptr->component_index[0] = ci;
+  scanptr->Ss = Ss;
+  scanptr->Se = Se;
+  scanptr->Ah = Ah;
+  scanptr->Al = Al;
+  scanptr++;
+  return scanptr;
+}
+
+LOCAL(jpeg_scan_info *)
+fill_scans (jpeg_scan_info * scanptr, int ncomps,
+	    int Ss, int Se, int Ah, int Al)
+/* Support routine: generate one scan for each component */
+{
+  int ci;
+
+  for (ci = 0; ci < ncomps; ci++) {
+    scanptr->comps_in_scan = 1;
+    scanptr->component_index[0] = ci;
+    scanptr->Ss = Ss;
+    scanptr->Se = Se;
+    scanptr->Ah = Ah;
+    scanptr->Al = Al;
+    scanptr++;
+  }
+  return scanptr;
+}
+
+LOCAL(jpeg_scan_info *)
+fill_dc_scans (jpeg_scan_info * scanptr, int ncomps, int Ah, int Al)
+/* Support routine: generate interleaved DC scan if possible, else N scans */
+{
+  int ci;
+
+  if (ncomps <= MAX_COMPS_IN_SCAN) {
+    /* Single interleaved DC scan */
+    scanptr->comps_in_scan = ncomps;
+    for (ci = 0; ci < ncomps; ci++)
+      scanptr->component_index[ci] = ci;
+    scanptr->Ss = scanptr->Se = 0;
+    scanptr->Ah = Ah;
+    scanptr->Al = Al;
+    scanptr++;
+  } else {
+    /* Noninterleaved DC scan for each component */
+    scanptr = fill_scans(scanptr, ncomps, 0, 0, Ah, Al);
+  }
+  return scanptr;
+}
+
+
+/*
+ * Create a recommended progressive-JPEG script.
+ * cinfo->num_components and cinfo->jpeg_color_space must be correct.
+ */
+
+GLOBAL(void)
+jpeg_simple_progression (j_compress_ptr cinfo)
+{
+  int ncomps = cinfo->num_components;
+  int nscans;
+  jpeg_scan_info * scanptr;
+
+  /* Safety check to ensure start_compress not called yet. */
+  if (cinfo->global_state != CSTATE_START)
+    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
+
+  /* Figure space needed for script.  Calculation must match code below! */
+  if (ncomps == 3 && cinfo->jpeg_color_space == JCS_YCbCr) {
+    /* Custom script for YCbCr color images. */
+    nscans = 10;
+  } else {
+    /* All-purpose script for other color spaces. */
+    if (ncomps > MAX_COMPS_IN_SCAN)
+      nscans = 6 * ncomps;	/* 2 DC + 4 AC scans per component */
+    else
+      nscans = 2 + 4 * ncomps;	/* 2 DC scans; 4 AC scans per component */
+  }
+
+  /* Allocate space for script.
+   * We need to put it in the permanent pool in case the application performs
+   * multiple compressions without changing the settings.  To avoid a memory
+   * leak if jpeg_simple_progression is called repeatedly for the same JPEG
+   * object, we try to re-use previously allocated space, and we allocate
+   * enough space to handle YCbCr even if initially asked for grayscale.
+   */
+  if (cinfo->script_space == NULL || cinfo->script_space_size < nscans) {
+    cinfo->script_space_size = MAX(nscans, 10);
+    cinfo->script_space = (jpeg_scan_info *)
+      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
+			cinfo->script_space_size * SIZEOF(jpeg_scan_info));
+  }
+  scanptr = cinfo->script_space;
+  cinfo->scan_info = scanptr;
+  cinfo->num_scans = nscans;
+
+  if (ncomps == 3 && cinfo->jpeg_color_space == JCS_YCbCr) {
+    /* Custom script for YCbCr color images. */
+    /* Initial DC scan */
+    scanptr = fill_dc_scans(scanptr, ncomps, 0, 1);
+    /* Initial AC scan: get some luma data out in a hurry */
+    scanptr = fill_a_scan(scanptr, 0, 1, 5, 0, 2);
+    /* Chroma data is too small to be worth expending many scans on */
+    scanptr = fill_a_scan(scanptr, 2, 1, 63, 0, 1);
+    scanptr = fill_a_scan(scanptr, 1, 1, 63, 0, 1);
+    /* Complete spectral selection for luma AC */
+    scanptr = fill_a_scan(scanptr, 0, 6, 63, 0, 2);
+    /* Refine next bit of luma AC */
+    scanptr = fill_a_scan(scanptr, 0, 1, 63, 2, 1);
+    /* Finish DC successive approximation */
+    scanptr = fill_dc_scans(scanptr, ncomps, 1, 0);
+    /* Finish AC successive approximation */
+    scanptr = fill_a_scan(scanptr, 2, 1, 63, 1, 0);
+    scanptr = fill_a_scan(scanptr, 1, 1, 63, 1, 0);
+    /* Luma bottom bit comes last since it's usually largest scan */
+    scanptr = fill_a_scan(scanptr, 0, 1, 63, 1, 0);
+  } else {
+    /* All-purpose script for other color spaces. */
+    /* Successive approximation first pass */
+    scanptr = fill_dc_scans(scanptr, ncomps, 0, 1);
+    scanptr = fill_scans(scanptr, ncomps, 1, 5, 0, 2);
+    scanptr = fill_scans(scanptr, ncomps, 6, 63, 0, 2);
+    /* Successive approximation second pass */
+    scanptr = fill_scans(scanptr, ncomps, 1, 63, 2, 1);
+    /* Successive approximation final pass */
+    scanptr = fill_dc_scans(scanptr, ncomps, 1, 0);
+    scanptr = fill_scans(scanptr, ncomps, 1, 63, 1, 0);
+  }
+}
+
+#endif /* C_PROGRESSIVE_SUPPORTED */
diff --git a/src/libjpeg-turbo/jcphuff.c b/src/libjpeg-turbo/jcphuff.c
new file mode 100644
index 0000000..3102871
--- /dev/null
+++ b/src/libjpeg-turbo/jcphuff.c
@@ -0,0 +1,831 @@
+/*
+ * jcphuff.c
+ *
+ * Copyright (C) 1995-1997, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains Huffman entropy encoding routines for progressive JPEG.
+ *
+ * We do not support output suspension in this module, since the library
+ * currently does not allow multiple-scan files to be written with output
+ * suspension.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jchuff.h"		/* Declarations shared with jchuff.c */
+
+#ifdef C_PROGRESSIVE_SUPPORTED
+
+/* Expanded entropy encoder object for progressive Huffman encoding. */
+
+typedef struct {
+  struct jpeg_entropy_encoder pub; /* public fields */
+
+  /* Mode flag: TRUE for optimization, FALSE for actual data output */
+  boolean gather_statistics;
+
+  /* Bit-level coding status.
+   * next_output_byte/free_in_buffer are local copies of cinfo->dest fields.
+   */
+  JOCTET * next_output_byte;	/* => next byte to write in buffer */
+  size_t free_in_buffer;	/* # of byte spaces remaining in buffer */
+  INT32 put_buffer;		/* current bit-accumulation buffer */
+  int put_bits;			/* # of bits now in it */
+  j_compress_ptr cinfo;		/* link to cinfo (needed for dump_buffer) */
+
+  /* Coding status for DC components */
+  int last_dc_val[MAX_COMPS_IN_SCAN]; /* last DC coef for each component */
+
+  /* Coding status for AC components */
+  int ac_tbl_no;		/* the table number of the single component */
+  unsigned int EOBRUN;		/* run length of EOBs */
+  unsigned int BE;		/* # of buffered correction bits before MCU */
+  char * bit_buffer;		/* buffer for correction bits (1 per char) */
+  /* packing correction bits tightly would save some space but cost time... */
+
+  unsigned int restarts_to_go;	/* MCUs left in this restart interval */
+  int next_restart_num;		/* next restart number to write (0-7) */
+
+  /* Pointers to derived tables (these workspaces have image lifespan).
+   * Since any one scan codes only DC or only AC, we only need one set
+   * of tables, not one for DC and one for AC.
+   */
+  c_derived_tbl * derived_tbls[NUM_HUFF_TBLS];
+
+  /* Statistics tables for optimization; again, one set is enough */
+  long * count_ptrs[NUM_HUFF_TBLS];
+} phuff_entropy_encoder;
+
+typedef phuff_entropy_encoder * phuff_entropy_ptr;
+
+/* MAX_CORR_BITS is the number of bits the AC refinement correction-bit
+ * buffer can hold.  Larger sizes may slightly improve compression, but
+ * 1000 is already well into the realm of overkill.
+ * The minimum safe size is 64 bits.
+ */
+
+#define MAX_CORR_BITS  1000	/* Max # of correction bits I can buffer */
+
+/* IRIGHT_SHIFT is like RIGHT_SHIFT, but works on int rather than INT32.
+ * We assume that int right shift is unsigned if INT32 right shift is,
+ * which should be safe.
+ */
+
+#ifdef RIGHT_SHIFT_IS_UNSIGNED
+#define ISHIFT_TEMPS	int ishift_temp;
+#define IRIGHT_SHIFT(x,shft)  \
+	((ishift_temp = (x)) < 0 ? \
+	 (ishift_temp >> (shft)) | ((~0) << (16-(shft))) : \
+	 (ishift_temp >> (shft)))
+#else
+#define ISHIFT_TEMPS
+#define IRIGHT_SHIFT(x,shft)	((x) >> (shft))
+#endif
+
+/* Forward declarations */
+METHODDEF(boolean) encode_mcu_DC_first JPP((j_compress_ptr cinfo,
+					    JBLOCKROW *MCU_data));
+METHODDEF(boolean) encode_mcu_AC_first JPP((j_compress_ptr cinfo,
+					    JBLOCKROW *MCU_data));
+METHODDEF(boolean) encode_mcu_DC_refine JPP((j_compress_ptr cinfo,
+					     JBLOCKROW *MCU_data));
+METHODDEF(boolean) encode_mcu_AC_refine JPP((j_compress_ptr cinfo,
+					     JBLOCKROW *MCU_data));
+METHODDEF(void) finish_pass_phuff JPP((j_compress_ptr cinfo));
+METHODDEF(void) finish_pass_gather_phuff JPP((j_compress_ptr cinfo));
+
+
+/*
+ * Initialize for a Huffman-compressed scan using progressive JPEG.
+ */
+
+METHODDEF(void)
+start_pass_phuff (j_compress_ptr cinfo, boolean gather_statistics)
+{  
+  phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
+  boolean is_DC_band;
+  int ci, tbl;
+  jpeg_component_info * compptr;
+
+  entropy->cinfo = cinfo;
+  entropy->gather_statistics = gather_statistics;
+
+  is_DC_band = (cinfo->Ss == 0);
+
+  /* We assume jcmaster.c already validated the scan parameters. */
+
+  /* Select execution routines */
+  if (cinfo->Ah == 0) {
+    if (is_DC_band)
+      entropy->pub.encode_mcu = encode_mcu_DC_first;
+    else
+      entropy->pub.encode_mcu = encode_mcu_AC_first;
+  } else {
+    if (is_DC_band)
+      entropy->pub.encode_mcu = encode_mcu_DC_refine;
+    else {
+      entropy->pub.encode_mcu = encode_mcu_AC_refine;
+      /* AC refinement needs a correction bit buffer */
+      if (entropy->bit_buffer == NULL)
+	entropy->bit_buffer = (char *)
+	  (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				      MAX_CORR_BITS * SIZEOF(char));
+    }
+  }
+  if (gather_statistics)
+    entropy->pub.finish_pass = finish_pass_gather_phuff;
+  else
+    entropy->pub.finish_pass = finish_pass_phuff;
+
+  /* Only DC coefficients may be interleaved, so cinfo->comps_in_scan = 1
+   * for AC coefficients.
+   */
+  for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
+    compptr = cinfo->cur_comp_info[ci];
+    /* Initialize DC predictions to 0 */
+    entropy->last_dc_val[ci] = 0;
+    /* Get table index */
+    if (is_DC_band) {
+      if (cinfo->Ah != 0)	/* DC refinement needs no table */
+	continue;
+      tbl = compptr->dc_tbl_no;
+    } else {
+      entropy->ac_tbl_no = tbl = compptr->ac_tbl_no;
+    }
+    if (gather_statistics) {
+      /* Check for invalid table index */
+      /* (make_c_derived_tbl does this in the other path) */
+      if (tbl < 0 || tbl >= NUM_HUFF_TBLS)
+        ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, tbl);
+      /* Allocate and zero the statistics tables */
+      /* Note that jpeg_gen_optimal_table expects 257 entries in each table! */
+      if (entropy->count_ptrs[tbl] == NULL)
+	entropy->count_ptrs[tbl] = (long *)
+	  (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				      257 * SIZEOF(long));
+      MEMZERO(entropy->count_ptrs[tbl], 257 * SIZEOF(long));
+    } else {
+      /* Compute derived values for Huffman table */
+      /* We may do this more than once for a table, but it's not expensive */
+      jpeg_make_c_derived_tbl(cinfo, is_DC_band, tbl,
+			      & entropy->derived_tbls[tbl]);
+    }
+  }
+
+  /* Initialize AC stuff */
+  entropy->EOBRUN = 0;
+  entropy->BE = 0;
+
+  /* Initialize bit buffer to empty */
+  entropy->put_buffer = 0;
+  entropy->put_bits = 0;
+
+  /* Initialize restart stuff */
+  entropy->restarts_to_go = cinfo->restart_interval;
+  entropy->next_restart_num = 0;
+}
+
+
+/* Outputting bytes to the file.
+ * NB: these must be called only when actually outputting,
+ * that is, entropy->gather_statistics == FALSE.
+ */
+
+/* Emit a byte */
+#define emit_byte(entropy,val)  \
+	{ *(entropy)->next_output_byte++ = (JOCTET) (val);  \
+	  if (--(entropy)->free_in_buffer == 0)  \
+	    dump_buffer(entropy); }
+
+
+LOCAL(void)
+dump_buffer (phuff_entropy_ptr entropy)
+/* Empty the output buffer; we do not support suspension in this module. */
+{
+  struct jpeg_destination_mgr * dest = entropy->cinfo->dest;
+
+  if (! (*dest->empty_output_buffer) (entropy->cinfo))
+    ERREXIT(entropy->cinfo, JERR_CANT_SUSPEND);
+  /* After a successful buffer dump, must reset buffer pointers */
+  entropy->next_output_byte = dest->next_output_byte;
+  entropy->free_in_buffer = dest->free_in_buffer;
+}
+
+
+/* Outputting bits to the file */
+
+/* Only the right 24 bits of put_buffer are used; the valid bits are
+ * left-justified in this part.  At most 16 bits can be passed to emit_bits
+ * in one call, and we never retain more than 7 bits in put_buffer
+ * between calls, so 24 bits are sufficient.
+ */
+
+LOCAL(void)
+emit_bits (phuff_entropy_ptr entropy, unsigned int code, int size)
+/* Emit some bits, unless we are in gather mode */
+{
+  /* This routine is heavily used, so it's worth coding tightly. */
+  register INT32 put_buffer = (INT32) code;
+  register int put_bits = entropy->put_bits;
+
+  /* if size is 0, caller used an invalid Huffman table entry */
+  if (size == 0)
+    ERREXIT(entropy->cinfo, JERR_HUFF_MISSING_CODE);
+
+  if (entropy->gather_statistics)
+    return;			/* do nothing if we're only getting stats */
+
+  put_buffer &= (((INT32) 1)<<size) - 1; /* mask off any extra bits in code */
+  
+  put_bits += size;		/* new number of bits in buffer */
+  
+  put_buffer <<= 24 - put_bits; /* align incoming bits */
+
+  put_buffer |= entropy->put_buffer; /* and merge with old buffer contents */
+
+  while (put_bits >= 8) {
+    int c = (int) ((put_buffer >> 16) & 0xFF);
+    
+    emit_byte(entropy, c);
+    if (c == 0xFF) {		/* need to stuff a zero byte? */
+      emit_byte(entropy, 0);
+    }
+    put_buffer <<= 8;
+    put_bits -= 8;
+  }
+
+  entropy->put_buffer = put_buffer; /* update variables */
+  entropy->put_bits = put_bits;
+}
+
+
+LOCAL(void)
+flush_bits (phuff_entropy_ptr entropy)
+{
+  emit_bits(entropy, 0x7F, 7); /* fill any partial byte with ones */
+  entropy->put_buffer = 0;     /* and reset bit-buffer to empty */
+  entropy->put_bits = 0;
+}
+
+
+/*
+ * Emit (or just count) a Huffman symbol.
+ */
+
+LOCAL(void)
+emit_symbol (phuff_entropy_ptr entropy, int tbl_no, int symbol)
+{
+  if (entropy->gather_statistics)
+    entropy->count_ptrs[tbl_no][symbol]++;
+  else {
+    c_derived_tbl * tbl = entropy->derived_tbls[tbl_no];
+    emit_bits(entropy, tbl->ehufco[symbol], tbl->ehufsi[symbol]);
+  }
+}
+
+
+/*
+ * Emit bits from a correction bit buffer.
+ */
+
+LOCAL(void)
+emit_buffered_bits (phuff_entropy_ptr entropy, char * bufstart,
+		    unsigned int nbits)
+{
+  if (entropy->gather_statistics)
+    return;			/* no real work */
+
+  while (nbits > 0) {
+    emit_bits(entropy, (unsigned int) (*bufstart), 1);
+    bufstart++;
+    nbits--;
+  }
+}
+
+
+/*
+ * Emit any pending EOBRUN symbol.
+ */
+
+LOCAL(void)
+emit_eobrun (phuff_entropy_ptr entropy)
+{
+  register int temp, nbits;
+
+  if (entropy->EOBRUN > 0) {	/* if there is any pending EOBRUN */
+    temp = entropy->EOBRUN;
+    nbits = 0;
+    while ((temp >>= 1))
+      nbits++;
+    /* safety check: shouldn't happen given limited correction-bit buffer */
+    if (nbits > 14)
+      ERREXIT(entropy->cinfo, JERR_HUFF_MISSING_CODE);
+
+    emit_symbol(entropy, entropy->ac_tbl_no, nbits << 4);
+    if (nbits)
+      emit_bits(entropy, entropy->EOBRUN, nbits);
+
+    entropy->EOBRUN = 0;
+
+    /* Emit any buffered correction bits */
+    emit_buffered_bits(entropy, entropy->bit_buffer, entropy->BE);
+    entropy->BE = 0;
+  }
+}
+
+
+/*
+ * Emit a restart marker & resynchronize predictions.
+ */
+
+LOCAL(void)
+emit_restart (phuff_entropy_ptr entropy, int restart_num)
+{
+  int ci;
+
+  emit_eobrun(entropy);
+
+  if (! entropy->gather_statistics) {
+    flush_bits(entropy);
+    emit_byte(entropy, 0xFF);
+    emit_byte(entropy, JPEG_RST0 + restart_num);
+  }
+
+  if (entropy->cinfo->Ss == 0) {
+    /* Re-initialize DC predictions to 0 */
+    for (ci = 0; ci < entropy->cinfo->comps_in_scan; ci++)
+      entropy->last_dc_val[ci] = 0;
+  } else {
+    /* Re-initialize all AC-related fields to 0 */
+    entropy->EOBRUN = 0;
+    entropy->BE = 0;
+  }
+}
+
+
+/*
+ * MCU encoding for DC initial scan (either spectral selection,
+ * or first pass of successive approximation).
+ */
+
+METHODDEF(boolean)
+encode_mcu_DC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
+{
+  phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
+  register int temp, temp2;
+  register int nbits;
+  int blkn, ci;
+  int Al = cinfo->Al;
+  JBLOCKROW block;
+  jpeg_component_info * compptr;
+  ISHIFT_TEMPS
+
+  entropy->next_output_byte = cinfo->dest->next_output_byte;
+  entropy->free_in_buffer = cinfo->dest->free_in_buffer;
+
+  /* Emit restart marker if needed */
+  if (cinfo->restart_interval)
+    if (entropy->restarts_to_go == 0)
+      emit_restart(entropy, entropy->next_restart_num);
+
+  /* Encode the MCU data blocks */
+  for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
+    block = MCU_data[blkn];
+    ci = cinfo->MCU_membership[blkn];
+    compptr = cinfo->cur_comp_info[ci];
+
+    /* Compute the DC value after the required point transform by Al.
+     * This is simply an arithmetic right shift.
+     */
+    temp2 = IRIGHT_SHIFT((int) ((*block)[0]), Al);
+
+    /* DC differences are figured on the point-transformed values. */
+    temp = temp2 - entropy->last_dc_val[ci];
+    entropy->last_dc_val[ci] = temp2;
+
+    /* Encode the DC coefficient difference per section G.1.2.1 */
+    temp2 = temp;
+    if (temp < 0) {
+      temp = -temp;		/* temp is abs value of input */
+      /* For a negative input, want temp2 = bitwise complement of abs(input) */
+      /* This code assumes we are on a two's complement machine */
+      temp2--;
+    }
+    
+    /* Find the number of bits needed for the magnitude of the coefficient */
+    nbits = 0;
+    while (temp) {
+      nbits++;
+      temp >>= 1;
+    }
+    /* Check for out-of-range coefficient values.
+     * Since we're encoding a difference, the range limit is twice as much.
+     */
+    if (nbits > MAX_COEF_BITS+1)
+      ERREXIT(cinfo, JERR_BAD_DCT_COEF);
+    
+    /* Count/emit the Huffman-coded symbol for the number of bits */
+    emit_symbol(entropy, compptr->dc_tbl_no, nbits);
+    
+    /* Emit that number of bits of the value, if positive, */
+    /* or the complement of its magnitude, if negative. */
+    if (nbits)			/* emit_bits rejects calls with size 0 */
+      emit_bits(entropy, (unsigned int) temp2, nbits);
+  }
+
+  cinfo->dest->next_output_byte = entropy->next_output_byte;
+  cinfo->dest->free_in_buffer = entropy->free_in_buffer;
+
+  /* Update restart-interval state too */
+  if (cinfo->restart_interval) {
+    if (entropy->restarts_to_go == 0) {
+      entropy->restarts_to_go = cinfo->restart_interval;
+      entropy->next_restart_num++;
+      entropy->next_restart_num &= 7;
+    }
+    entropy->restarts_to_go--;
+  }
+
+  return TRUE;
+}
+
+
+/*
+ * MCU encoding for AC initial scan (either spectral selection,
+ * or first pass of successive approximation).
+ */
+
+METHODDEF(boolean)
+encode_mcu_AC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
+{
+  phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
+  register int temp, temp2;
+  register int nbits;
+  register int r, k;
+  int Se = cinfo->Se;
+  int Al = cinfo->Al;
+  JBLOCKROW block;
+
+  entropy->next_output_byte = cinfo->dest->next_output_byte;
+  entropy->free_in_buffer = cinfo->dest->free_in_buffer;
+
+  /* Emit restart marker if needed */
+  if (cinfo->restart_interval)
+    if (entropy->restarts_to_go == 0)
+      emit_restart(entropy, entropy->next_restart_num);
+
+  /* Encode the MCU data block */
+  block = MCU_data[0];
+
+  /* Encode the AC coefficients per section G.1.2.2, fig. G.3 */
+  
+  r = 0;			/* r = run length of zeros */
+   
+  for (k = cinfo->Ss; k <= Se; k++) {
+    if ((temp = (*block)[jpeg_natural_order[k]]) == 0) {
+      r++;
+      continue;
+    }
+    /* We must apply the point transform by Al.  For AC coefficients this
+     * is an integer division with rounding towards 0.  To do this portably
+     * in C, we shift after obtaining the absolute value; so the code is
+     * interwoven with finding the abs value (temp) and output bits (temp2).
+     */
+    if (temp < 0) {
+      temp = -temp;		/* temp is abs value of input */
+      temp >>= Al;		/* apply the point transform */
+      /* For a negative coef, want temp2 = bitwise complement of abs(coef) */
+      temp2 = ~temp;
+    } else {
+      temp >>= Al;		/* apply the point transform */
+      temp2 = temp;
+    }
+    /* Watch out for case that nonzero coef is zero after point transform */
+    if (temp == 0) {
+      r++;
+      continue;
+    }
+
+    /* Emit any pending EOBRUN */
+    if (entropy->EOBRUN > 0)
+      emit_eobrun(entropy);
+    /* if run length > 15, must emit special run-length-16 codes (0xF0) */
+    while (r > 15) {
+      emit_symbol(entropy, entropy->ac_tbl_no, 0xF0);
+      r -= 16;
+    }
+
+    /* Find the number of bits needed for the magnitude of the coefficient */
+    nbits = 1;			/* there must be at least one 1 bit */
+    while ((temp >>= 1))
+      nbits++;
+    /* Check for out-of-range coefficient values */
+    if (nbits > MAX_COEF_BITS)
+      ERREXIT(cinfo, JERR_BAD_DCT_COEF);
+
+    /* Count/emit Huffman symbol for run length / number of bits */
+    emit_symbol(entropy, entropy->ac_tbl_no, (r << 4) + nbits);
+
+    /* Emit that number of bits of the value, if positive, */
+    /* or the complement of its magnitude, if negative. */
+    emit_bits(entropy, (unsigned int) temp2, nbits);
+
+    r = 0;			/* reset zero run length */
+  }
+
+  if (r > 0) {			/* If there are trailing zeroes, */
+    entropy->EOBRUN++;		/* count an EOB */
+    if (entropy->EOBRUN == 0x7FFF)
+      emit_eobrun(entropy);	/* force it out to avoid overflow */
+  }
+
+  cinfo->dest->next_output_byte = entropy->next_output_byte;
+  cinfo->dest->free_in_buffer = entropy->free_in_buffer;
+
+  /* Update restart-interval state too */
+  if (cinfo->restart_interval) {
+    if (entropy->restarts_to_go == 0) {
+      entropy->restarts_to_go = cinfo->restart_interval;
+      entropy->next_restart_num++;
+      entropy->next_restart_num &= 7;
+    }
+    entropy->restarts_to_go--;
+  }
+
+  return TRUE;
+}
+
+
+/*
+ * MCU encoding for DC successive approximation refinement scan.
+ * Note: we assume such scans can be multi-component, although the spec
+ * is not very clear on the point.
+ */
+
+METHODDEF(boolean)
+encode_mcu_DC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
+{
+  phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
+  register int temp;
+  int blkn;
+  int Al = cinfo->Al;
+  JBLOCKROW block;
+
+  entropy->next_output_byte = cinfo->dest->next_output_byte;
+  entropy->free_in_buffer = cinfo->dest->free_in_buffer;
+
+  /* Emit restart marker if needed */
+  if (cinfo->restart_interval)
+    if (entropy->restarts_to_go == 0)
+      emit_restart(entropy, entropy->next_restart_num);
+
+  /* Encode the MCU data blocks */
+  for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
+    block = MCU_data[blkn];
+
+    /* We simply emit the Al'th bit of the DC coefficient value. */
+    temp = (*block)[0];
+    emit_bits(entropy, (unsigned int) (temp >> Al), 1);
+  }
+
+  cinfo->dest->next_output_byte = entropy->next_output_byte;
+  cinfo->dest->free_in_buffer = entropy->free_in_buffer;
+
+  /* Update restart-interval state too */
+  if (cinfo->restart_interval) {
+    if (entropy->restarts_to_go == 0) {
+      entropy->restarts_to_go = cinfo->restart_interval;
+      entropy->next_restart_num++;
+      entropy->next_restart_num &= 7;
+    }
+    entropy->restarts_to_go--;
+  }
+
+  return TRUE;
+}
+
+
+/*
+ * MCU encoding for AC successive approximation refinement scan.
+ */
+
+METHODDEF(boolean)
+encode_mcu_AC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
+{
+  phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
+  register int temp;
+  register int r, k;
+  int EOB;
+  char *BR_buffer;
+  unsigned int BR;
+  int Se = cinfo->Se;
+  int Al = cinfo->Al;
+  JBLOCKROW block;
+  int absvalues[DCTSIZE2];
+
+  entropy->next_output_byte = cinfo->dest->next_output_byte;
+  entropy->free_in_buffer = cinfo->dest->free_in_buffer;
+
+  /* Emit restart marker if needed */
+  if (cinfo->restart_interval)
+    if (entropy->restarts_to_go == 0)
+      emit_restart(entropy, entropy->next_restart_num);
+
+  /* Encode the MCU data block */
+  block = MCU_data[0];
+
+  /* It is convenient to make a pre-pass to determine the transformed
+   * coefficients' absolute values and the EOB position.
+   */
+  EOB = 0;
+  for (k = cinfo->Ss; k <= Se; k++) {
+    temp = (*block)[jpeg_natural_order[k]];
+    /* We must apply the point transform by Al.  For AC coefficients this
+     * is an integer division with rounding towards 0.  To do this portably
+     * in C, we shift after obtaining the absolute value.
+     */
+    if (temp < 0)
+      temp = -temp;		/* temp is abs value of input */
+    temp >>= Al;		/* apply the point transform */
+    absvalues[k] = temp;	/* save abs value for main pass */
+    if (temp == 1)
+      EOB = k;			/* EOB = index of last newly-nonzero coef */
+  }
+
+  /* Encode the AC coefficients per section G.1.2.3, fig. G.7 */
+  
+  r = 0;			/* r = run length of zeros */
+  BR = 0;			/* BR = count of buffered bits added now */
+  BR_buffer = entropy->bit_buffer + entropy->BE; /* Append bits to buffer */
+
+  for (k = cinfo->Ss; k <= Se; k++) {
+    if ((temp = absvalues[k]) == 0) {
+      r++;
+      continue;
+    }
+
+    /* Emit any required ZRLs, but not if they can be folded into EOB */
+    while (r > 15 && k <= EOB) {
+      /* emit any pending EOBRUN and the BE correction bits */
+      emit_eobrun(entropy);
+      /* Emit ZRL */
+      emit_symbol(entropy, entropy->ac_tbl_no, 0xF0);
+      r -= 16;
+      /* Emit buffered correction bits that must be associated with ZRL */
+      emit_buffered_bits(entropy, BR_buffer, BR);
+      BR_buffer = entropy->bit_buffer; /* BE bits are gone now */
+      BR = 0;
+    }
+
+    /* If the coef was previously nonzero, it only needs a correction bit.
+     * NOTE: a straight translation of the spec's figure G.7 would suggest
+     * that we also need to test r > 15.  But if r > 15, we can only get here
+     * if k > EOB, which implies that this coefficient is not 1.
+     */
+    if (temp > 1) {
+      /* The correction bit is the next bit of the absolute value. */
+      BR_buffer[BR++] = (char) (temp & 1);
+      continue;
+    }
+
+    /* Emit any pending EOBRUN and the BE correction bits */
+    emit_eobrun(entropy);
+
+    /* Count/emit Huffman symbol for run length / number of bits */
+    emit_symbol(entropy, entropy->ac_tbl_no, (r << 4) + 1);
+
+    /* Emit output bit for newly-nonzero coef */
+    temp = ((*block)[jpeg_natural_order[k]] < 0) ? 0 : 1;
+    emit_bits(entropy, (unsigned int) temp, 1);
+
+    /* Emit buffered correction bits that must be associated with this code */
+    emit_buffered_bits(entropy, BR_buffer, BR);
+    BR_buffer = entropy->bit_buffer; /* BE bits are gone now */
+    BR = 0;
+    r = 0;			/* reset zero run length */
+  }
+
+  if (r > 0 || BR > 0) {	/* If there are trailing zeroes, */
+    entropy->EOBRUN++;		/* count an EOB */
+    entropy->BE += BR;		/* concat my correction bits to older ones */
+    /* We force out the EOB if we risk either:
+     * 1. overflow of the EOB counter;
+     * 2. overflow of the correction bit buffer during the next MCU.
+     */
+    if (entropy->EOBRUN == 0x7FFF || entropy->BE > (MAX_CORR_BITS-DCTSIZE2+1))
+      emit_eobrun(entropy);
+  }
+
+  cinfo->dest->next_output_byte = entropy->next_output_byte;
+  cinfo->dest->free_in_buffer = entropy->free_in_buffer;
+
+  /* Update restart-interval state too */
+  if (cinfo->restart_interval) {
+    if (entropy->restarts_to_go == 0) {
+      entropy->restarts_to_go = cinfo->restart_interval;
+      entropy->next_restart_num++;
+      entropy->next_restart_num &= 7;
+    }
+    entropy->restarts_to_go--;
+  }
+
+  return TRUE;
+}
+
+
+/*
+ * Finish up at the end of a Huffman-compressed progressive scan.
+ */
+
+METHODDEF(void)
+finish_pass_phuff (j_compress_ptr cinfo)
+{   
+  phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
+
+  entropy->next_output_byte = cinfo->dest->next_output_byte;
+  entropy->free_in_buffer = cinfo->dest->free_in_buffer;
+
+  /* Flush out any buffered data */
+  emit_eobrun(entropy);
+  flush_bits(entropy);
+
+  cinfo->dest->next_output_byte = entropy->next_output_byte;
+  cinfo->dest->free_in_buffer = entropy->free_in_buffer;
+}
+
+
+/*
+ * Finish up a statistics-gathering pass and create the new Huffman tables.
+ */
+
+METHODDEF(void)
+finish_pass_gather_phuff (j_compress_ptr cinfo)
+{
+  phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
+  boolean is_DC_band;
+  int ci, tbl;
+  jpeg_component_info * compptr;
+  JHUFF_TBL **htblptr;
+  boolean did[NUM_HUFF_TBLS];
+
+  /* Flush out buffered data (all we care about is counting the EOB symbol) */
+  emit_eobrun(entropy);
+
+  is_DC_band = (cinfo->Ss == 0);
+
+  /* It's important not to apply jpeg_gen_optimal_table more than once
+   * per table, because it clobbers the input frequency counts!
+   */
+  MEMZERO(did, SIZEOF(did));
+
+  for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
+    compptr = cinfo->cur_comp_info[ci];
+    if (is_DC_band) {
+      if (cinfo->Ah != 0)	/* DC refinement needs no table */
+	continue;
+      tbl = compptr->dc_tbl_no;
+    } else {
+      tbl = compptr->ac_tbl_no;
+    }
+    if (! did[tbl]) {
+      if (is_DC_band)
+        htblptr = & cinfo->dc_huff_tbl_ptrs[tbl];
+      else
+        htblptr = & cinfo->ac_huff_tbl_ptrs[tbl];
+      if (*htblptr == NULL)
+        *htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo);
+      jpeg_gen_optimal_table(cinfo, *htblptr, entropy->count_ptrs[tbl]);
+      did[tbl] = TRUE;
+    }
+  }
+}
+
+
+/*
+ * Module initialization routine for progressive Huffman entropy encoding.
+ */
+
+GLOBAL(void)
+jinit_phuff_encoder (j_compress_ptr cinfo)
+{
+  phuff_entropy_ptr entropy;
+  int i;
+
+  entropy = (phuff_entropy_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				SIZEOF(phuff_entropy_encoder));
+  cinfo->entropy = (struct jpeg_entropy_encoder *) entropy;
+  entropy->pub.start_pass = start_pass_phuff;
+
+  /* Mark tables unallocated */
+  for (i = 0; i < NUM_HUFF_TBLS; i++) {
+    entropy->derived_tbls[i] = NULL;
+    entropy->count_ptrs[i] = NULL;
+  }
+  entropy->bit_buffer = NULL;	/* needed only in AC refinement scan */
+}
+
+#endif /* C_PROGRESSIVE_SUPPORTED */
diff --git a/src/libjpeg-turbo/jcprepct.c b/src/libjpeg-turbo/jcprepct.c
new file mode 100644
index 0000000..fa93333
--- /dev/null
+++ b/src/libjpeg-turbo/jcprepct.c
@@ -0,0 +1,354 @@
+/*
+ * jcprepct.c
+ *
+ * Copyright (C) 1994-1996, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains the compression preprocessing controller.
+ * This controller manages the color conversion, downsampling,
+ * and edge expansion steps.
+ *
+ * Most of the complexity here is associated with buffering input rows
+ * as required by the downsampler.  See the comments at the head of
+ * jcsample.c for the downsampler's needs.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+
+
+/* At present, jcsample.c can request context rows only for smoothing.
+ * In the future, we might also need context rows for CCIR601 sampling
+ * or other more-complex downsampling procedures.  The code to support
+ * context rows should be compiled only if needed.
+ */
+#ifdef INPUT_SMOOTHING_SUPPORTED
+#define CONTEXT_ROWS_SUPPORTED
+#endif
+
+
+/*
+ * For the simple (no-context-row) case, we just need to buffer one
+ * row group's worth of pixels for the downsampling step.  At the bottom of
+ * the image, we pad to a full row group by replicating the last pixel row.
+ * The downsampler's last output row is then replicated if needed to pad
+ * out to a full iMCU row.
+ *
+ * When providing context rows, we must buffer three row groups' worth of
+ * pixels.  Three row groups are physically allocated, but the row pointer
+ * arrays are made five row groups high, with the extra pointers above and
+ * below "wrapping around" to point to the last and first real row groups.
+ * This allows the downsampler to access the proper context rows.
+ * At the top and bottom of the image, we create dummy context rows by
+ * copying the first or last real pixel row.  This copying could be avoided
+ * by pointer hacking as is done in jdmainct.c, but it doesn't seem worth the
+ * trouble on the compression side.
+ */
+
+
+/* Private buffer controller object */
+
+typedef struct {
+  struct jpeg_c_prep_controller pub; /* public fields */
+
+  /* Downsampling input buffer.  This buffer holds color-converted data
+   * until we have enough to do a downsample step.
+   */
+  JSAMPARRAY color_buf[MAX_COMPONENTS];
+
+  JDIMENSION rows_to_go;	/* counts rows remaining in source image */
+  int next_buf_row;		/* index of next row to store in color_buf */
+
+#ifdef CONTEXT_ROWS_SUPPORTED	/* only needed for context case */
+  int this_row_group;		/* starting row index of group to process */
+  int next_buf_stop;		/* downsample when we reach this index */
+#endif
+} my_prep_controller;
+
+typedef my_prep_controller * my_prep_ptr;
+
+
+/*
+ * Initialize for a processing pass.
+ */
+
+METHODDEF(void)
+start_pass_prep (j_compress_ptr cinfo, J_BUF_MODE pass_mode)
+{
+  my_prep_ptr prep = (my_prep_ptr) cinfo->prep;
+
+  if (pass_mode != JBUF_PASS_THRU)
+    ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
+
+  /* Initialize total-height counter for detecting bottom of image */
+  prep->rows_to_go = cinfo->image_height;
+  /* Mark the conversion buffer empty */
+  prep->next_buf_row = 0;
+#ifdef CONTEXT_ROWS_SUPPORTED
+  /* Preset additional state variables for context mode.
+   * These aren't used in non-context mode, so we needn't test which mode.
+   */
+  prep->this_row_group = 0;
+  /* Set next_buf_stop to stop after two row groups have been read in. */
+  prep->next_buf_stop = 2 * cinfo->max_v_samp_factor;
+#endif
+}
+
+
+/*
+ * Expand an image vertically from height input_rows to height output_rows,
+ * by duplicating the bottom row.
+ */
+
+LOCAL(void)
+expand_bottom_edge (JSAMPARRAY image_data, JDIMENSION num_cols,
+		    int input_rows, int output_rows)
+{
+  register int row;
+
+  for (row = input_rows; row < output_rows; row++) {
+    jcopy_sample_rows(image_data, input_rows-1, image_data, row,
+		      1, num_cols);
+  }
+}
+
+
+/*
+ * Process some data in the simple no-context case.
+ *
+ * Preprocessor output data is counted in "row groups".  A row group
+ * is defined to be v_samp_factor sample rows of each component.
+ * Downsampling will produce this much data from each max_v_samp_factor
+ * input rows.
+ */
+
+METHODDEF(void)
+pre_process_data (j_compress_ptr cinfo,
+		  JSAMPARRAY input_buf, JDIMENSION *in_row_ctr,
+		  JDIMENSION in_rows_avail,
+		  JSAMPIMAGE output_buf, JDIMENSION *out_row_group_ctr,
+		  JDIMENSION out_row_groups_avail)
+{
+  my_prep_ptr prep = (my_prep_ptr) cinfo->prep;
+  int numrows, ci;
+  JDIMENSION inrows;
+  jpeg_component_info * compptr;
+
+  while (*in_row_ctr < in_rows_avail &&
+	 *out_row_group_ctr < out_row_groups_avail) {
+    /* Do color conversion to fill the conversion buffer. */
+    inrows = in_rows_avail - *in_row_ctr;
+    numrows = cinfo->max_v_samp_factor - prep->next_buf_row;
+    numrows = (int) MIN((JDIMENSION) numrows, inrows);
+    (*cinfo->cconvert->color_convert) (cinfo, input_buf + *in_row_ctr,
+				       prep->color_buf,
+				       (JDIMENSION) prep->next_buf_row,
+				       numrows);
+    *in_row_ctr += numrows;
+    prep->next_buf_row += numrows;
+    prep->rows_to_go -= numrows;
+    /* If at bottom of image, pad to fill the conversion buffer. */
+    if (prep->rows_to_go == 0 &&
+	prep->next_buf_row < cinfo->max_v_samp_factor) {
+      for (ci = 0; ci < cinfo->num_components; ci++) {
+	expand_bottom_edge(prep->color_buf[ci], cinfo->image_width,
+			   prep->next_buf_row, cinfo->max_v_samp_factor);
+      }
+      prep->next_buf_row = cinfo->max_v_samp_factor;
+    }
+    /* If we've filled the conversion buffer, empty it. */
+    if (prep->next_buf_row == cinfo->max_v_samp_factor) {
+      (*cinfo->downsample->downsample) (cinfo,
+					prep->color_buf, (JDIMENSION) 0,
+					output_buf, *out_row_group_ctr);
+      prep->next_buf_row = 0;
+      (*out_row_group_ctr)++;
+    }
+    /* If at bottom of image, pad the output to a full iMCU height.
+     * Note we assume the caller is providing a one-iMCU-height output buffer!
+     */
+    if (prep->rows_to_go == 0 &&
+	*out_row_group_ctr < out_row_groups_avail) {
+      for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+	   ci++, compptr++) {
+	expand_bottom_edge(output_buf[ci],
+			   compptr->width_in_blocks * DCTSIZE,
+			   (int) (*out_row_group_ctr * compptr->v_samp_factor),
+			   (int) (out_row_groups_avail * compptr->v_samp_factor));
+      }
+      *out_row_group_ctr = out_row_groups_avail;
+      break;			/* can exit outer loop without test */
+    }
+  }
+}
+
+
+#ifdef CONTEXT_ROWS_SUPPORTED
+
+/*
+ * Process some data in the context case.
+ */
+
+METHODDEF(void)
+pre_process_context (j_compress_ptr cinfo,
+		     JSAMPARRAY input_buf, JDIMENSION *in_row_ctr,
+		     JDIMENSION in_rows_avail,
+		     JSAMPIMAGE output_buf, JDIMENSION *out_row_group_ctr,
+		     JDIMENSION out_row_groups_avail)
+{
+  my_prep_ptr prep = (my_prep_ptr) cinfo->prep;
+  int numrows, ci;
+  int buf_height = cinfo->max_v_samp_factor * 3;
+  JDIMENSION inrows;
+
+  while (*out_row_group_ctr < out_row_groups_avail) {
+    if (*in_row_ctr < in_rows_avail) {
+      /* Do color conversion to fill the conversion buffer. */
+      inrows = in_rows_avail - *in_row_ctr;
+      numrows = prep->next_buf_stop - prep->next_buf_row;
+      numrows = (int) MIN((JDIMENSION) numrows, inrows);
+      (*cinfo->cconvert->color_convert) (cinfo, input_buf + *in_row_ctr,
+					 prep->color_buf,
+					 (JDIMENSION) prep->next_buf_row,
+					 numrows);
+      /* Pad at top of image, if first time through */
+      if (prep->rows_to_go == cinfo->image_height) {
+	for (ci = 0; ci < cinfo->num_components; ci++) {
+	  int row;
+	  for (row = 1; row <= cinfo->max_v_samp_factor; row++) {
+	    jcopy_sample_rows(prep->color_buf[ci], 0,
+			      prep->color_buf[ci], -row,
+			      1, cinfo->image_width);
+	  }
+	}
+      }
+      *in_row_ctr += numrows;
+      prep->next_buf_row += numrows;
+      prep->rows_to_go -= numrows;
+    } else {
+      /* Return for more data, unless we are at the bottom of the image. */
+      if (prep->rows_to_go != 0)
+	break;
+      /* When at bottom of image, pad to fill the conversion buffer. */
+      if (prep->next_buf_row < prep->next_buf_stop) {
+	for (ci = 0; ci < cinfo->num_components; ci++) {
+	  expand_bottom_edge(prep->color_buf[ci], cinfo->image_width,
+			     prep->next_buf_row, prep->next_buf_stop);
+	}
+	prep->next_buf_row = prep->next_buf_stop;
+      }
+    }
+    /* If we've gotten enough data, downsample a row group. */
+    if (prep->next_buf_row == prep->next_buf_stop) {
+      (*cinfo->downsample->downsample) (cinfo,
+					prep->color_buf,
+					(JDIMENSION) prep->this_row_group,
+					output_buf, *out_row_group_ctr);
+      (*out_row_group_ctr)++;
+      /* Advance pointers with wraparound as necessary. */
+      prep->this_row_group += cinfo->max_v_samp_factor;
+      if (prep->this_row_group >= buf_height)
+	prep->this_row_group = 0;
+      if (prep->next_buf_row >= buf_height)
+	prep->next_buf_row = 0;
+      prep->next_buf_stop = prep->next_buf_row + cinfo->max_v_samp_factor;
+    }
+  }
+}
+
+
+/*
+ * Create the wrapped-around downsampling input buffer needed for context mode.
+ */
+
+LOCAL(void)
+create_context_buffer (j_compress_ptr cinfo)
+{
+  my_prep_ptr prep = (my_prep_ptr) cinfo->prep;
+  int rgroup_height = cinfo->max_v_samp_factor;
+  int ci, i;
+  jpeg_component_info * compptr;
+  JSAMPARRAY true_buffer, fake_buffer;
+
+  /* Grab enough space for fake row pointers for all the components;
+   * we need five row groups' worth of pointers for each component.
+   */
+  fake_buffer = (JSAMPARRAY)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				(cinfo->num_components * 5 * rgroup_height) *
+				SIZEOF(JSAMPROW));
+
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    /* Allocate the actual buffer space (3 row groups) for this component.
+     * We make the buffer wide enough to allow the downsampler to edge-expand
+     * horizontally within the buffer, if it so chooses.
+     */
+    true_buffer = (*cinfo->mem->alloc_sarray)
+      ((j_common_ptr) cinfo, JPOOL_IMAGE,
+       (JDIMENSION) (((long) compptr->width_in_blocks * DCTSIZE *
+		      cinfo->max_h_samp_factor) / compptr->h_samp_factor),
+       (JDIMENSION) (3 * rgroup_height));
+    /* Copy true buffer row pointers into the middle of the fake row array */
+    MEMCOPY(fake_buffer + rgroup_height, true_buffer,
+	    3 * rgroup_height * SIZEOF(JSAMPROW));
+    /* Fill in the above and below wraparound pointers */
+    for (i = 0; i < rgroup_height; i++) {
+      fake_buffer[i] = true_buffer[2 * rgroup_height + i];
+      fake_buffer[4 * rgroup_height + i] = true_buffer[i];
+    }
+    prep->color_buf[ci] = fake_buffer + rgroup_height;
+    fake_buffer += 5 * rgroup_height; /* point to space for next component */
+  }
+}
+
+#endif /* CONTEXT_ROWS_SUPPORTED */
+
+
+/*
+ * Initialize preprocessing controller.
+ */
+
+GLOBAL(void)
+jinit_c_prep_controller (j_compress_ptr cinfo, boolean need_full_buffer)
+{
+  my_prep_ptr prep;
+  int ci;
+  jpeg_component_info * compptr;
+
+  if (need_full_buffer)		/* safety check */
+    ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
+
+  prep = (my_prep_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				SIZEOF(my_prep_controller));
+  cinfo->prep = (struct jpeg_c_prep_controller *) prep;
+  prep->pub.start_pass = start_pass_prep;
+
+  /* Allocate the color conversion buffer.
+   * We make the buffer wide enough to allow the downsampler to edge-expand
+   * horizontally within the buffer, if it so chooses.
+   */
+  if (cinfo->downsample->need_context_rows) {
+    /* Set up to provide context rows */
+#ifdef CONTEXT_ROWS_SUPPORTED
+    prep->pub.pre_process_data = pre_process_context;
+    create_context_buffer(cinfo);
+#else
+    ERREXIT(cinfo, JERR_NOT_COMPILED);
+#endif
+  } else {
+    /* No context, just make it tall enough for one row group */
+    prep->pub.pre_process_data = pre_process_data;
+    for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+	 ci++, compptr++) {
+      prep->color_buf[ci] = (*cinfo->mem->alloc_sarray)
+	((j_common_ptr) cinfo, JPOOL_IMAGE,
+	 (JDIMENSION) (((long) compptr->width_in_blocks * DCTSIZE *
+			cinfo->max_h_samp_factor) / compptr->h_samp_factor),
+	 (JDIMENSION) cinfo->max_v_samp_factor);
+    }
+  }
+}
diff --git a/src/libjpeg-turbo/jcsample.c b/src/libjpeg-turbo/jcsample.c
new file mode 100644
index 0000000..eea376f
--- /dev/null
+++ b/src/libjpeg-turbo/jcsample.c
@@ -0,0 +1,527 @@
+/*
+ * jcsample.c
+ *
+ * Copyright (C) 1991-1996, Thomas G. Lane.
+ * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains downsampling routines.
+ *
+ * Downsampling input data is counted in "row groups".  A row group
+ * is defined to be max_v_samp_factor pixel rows of each component,
+ * from which the downsampler produces v_samp_factor sample rows.
+ * A single row group is processed in each call to the downsampler module.
+ *
+ * The downsampler is responsible for edge-expansion of its output data
+ * to fill an integral number of DCT blocks horizontally.  The source buffer
+ * may be modified if it is helpful for this purpose (the source buffer is
+ * allocated wide enough to correspond to the desired output width).
+ * The caller (the prep controller) is responsible for vertical padding.
+ *
+ * The downsampler may request "context rows" by setting need_context_rows
+ * during startup.  In this case, the input arrays will contain at least
+ * one row group's worth of pixels above and below the passed-in data;
+ * the caller will create dummy rows at image top and bottom by replicating
+ * the first or last real pixel row.
+ *
+ * An excellent reference for image resampling is
+ *   Digital Image Warping, George Wolberg, 1990.
+ *   Pub. by IEEE Computer Society Press, Los Alamitos, CA. ISBN 0-8186-8944-7.
+ *
+ * The downsampling algorithm used here is a simple average of the source
+ * pixels covered by the output pixel.  The hi-falutin sampling literature
+ * refers to this as a "box filter".  In general the characteristics of a box
+ * filter are not very good, but for the specific cases we normally use (1:1
+ * and 2:1 ratios) the box is equivalent to a "triangle filter" which is not
+ * nearly so bad.  If you intend to use other sampling ratios, you'd be well
+ * advised to improve this code.
+ *
+ * A simple input-smoothing capability is provided.  This is mainly intended
+ * for cleaning up color-dithered GIF input files (if you find it inadequate,
+ * we suggest using an external filtering program such as pnmconvol).  When
+ * enabled, each input pixel P is replaced by a weighted sum of itself and its
+ * eight neighbors.  P's weight is 1-8*SF and each neighbor's weight is SF,
+ * where SF = (smoothing_factor / 1024).
+ * Currently, smoothing is only supported for 2h2v sampling factors.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jsimd.h"
+
+
+/* Pointer to routine to downsample a single component */
+typedef JMETHOD(void, downsample1_ptr,
+		(j_compress_ptr cinfo, jpeg_component_info * compptr,
+		 JSAMPARRAY input_data, JSAMPARRAY output_data));
+
+/* Private subobject */
+
+typedef struct {
+  struct jpeg_downsampler pub;	/* public fields */
+
+  /* Downsampling method pointers, one per component */
+  downsample1_ptr methods[MAX_COMPONENTS];
+} my_downsampler;
+
+typedef my_downsampler * my_downsample_ptr;
+
+
+/*
+ * Initialize for a downsampling pass.
+ */
+
+METHODDEF(void)
+start_pass_downsample (j_compress_ptr cinfo)
+{
+  /* no work for now */
+}
+
+
+/*
+ * Expand a component horizontally from width input_cols to width output_cols,
+ * by duplicating the rightmost samples.
+ */
+
+LOCAL(void)
+expand_right_edge (JSAMPARRAY image_data, int num_rows,
+		   JDIMENSION input_cols, JDIMENSION output_cols)
+{
+  register JSAMPROW ptr;
+  register JSAMPLE pixval;
+  register int count;
+  int row;
+  int numcols = (int) (output_cols - input_cols);
+
+  if (numcols > 0) {
+    for (row = 0; row < num_rows; row++) {
+      ptr = image_data[row] + input_cols;
+      pixval = ptr[-1];		/* don't need GETJSAMPLE() here */
+      for (count = numcols; count > 0; count--)
+	*ptr++ = pixval;
+    }
+  }
+}
+
+
+/*
+ * Do downsampling for a whole row group (all components).
+ *
+ * In this version we simply downsample each component independently.
+ */
+
+METHODDEF(void)
+sep_downsample (j_compress_ptr cinfo,
+		JSAMPIMAGE input_buf, JDIMENSION in_row_index,
+		JSAMPIMAGE output_buf, JDIMENSION out_row_group_index)
+{
+  my_downsample_ptr downsample = (my_downsample_ptr) cinfo->downsample;
+  int ci;
+  jpeg_component_info * compptr;
+  JSAMPARRAY in_ptr, out_ptr;
+
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    in_ptr = input_buf[ci] + in_row_index;
+    out_ptr = output_buf[ci] + (out_row_group_index * compptr->v_samp_factor);
+    (*downsample->methods[ci]) (cinfo, compptr, in_ptr, out_ptr);
+  }
+}
+
+
+/*
+ * Downsample pixel values of a single component.
+ * One row group is processed per call.
+ * This version handles arbitrary integral sampling ratios, without smoothing.
+ * Note that this version is not actually used for customary sampling ratios.
+ */
+
+METHODDEF(void)
+int_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
+		JSAMPARRAY input_data, JSAMPARRAY output_data)
+{
+  int inrow, outrow, h_expand, v_expand, numpix, numpix2, h, v;
+  JDIMENSION outcol, outcol_h;	/* outcol_h == outcol*h_expand */
+  JDIMENSION output_cols = compptr->width_in_blocks * DCTSIZE;
+  JSAMPROW inptr, outptr;
+  INT32 outvalue;
+
+  h_expand = cinfo->max_h_samp_factor / compptr->h_samp_factor;
+  v_expand = cinfo->max_v_samp_factor / compptr->v_samp_factor;
+  numpix = h_expand * v_expand;
+  numpix2 = numpix/2;
+
+  /* Expand input data enough to let all the output samples be generated
+   * by the standard loop.  Special-casing padded output would be more
+   * efficient.
+   */
+  expand_right_edge(input_data, cinfo->max_v_samp_factor,
+		    cinfo->image_width, output_cols * h_expand);
+
+  inrow = 0;
+  for (outrow = 0; outrow < compptr->v_samp_factor; outrow++) {
+    outptr = output_data[outrow];
+    for (outcol = 0, outcol_h = 0; outcol < output_cols;
+	 outcol++, outcol_h += h_expand) {
+      outvalue = 0;
+      for (v = 0; v < v_expand; v++) {
+	inptr = input_data[inrow+v] + outcol_h;
+	for (h = 0; h < h_expand; h++) {
+	  outvalue += (INT32) GETJSAMPLE(*inptr++);
+	}
+      }
+      *outptr++ = (JSAMPLE) ((outvalue + numpix2) / numpix);
+    }
+    inrow += v_expand;
+  }
+}
+
+
+/*
+ * Downsample pixel values of a single component.
+ * This version handles the special case of a full-size component,
+ * without smoothing.
+ */
+
+METHODDEF(void)
+fullsize_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
+		     JSAMPARRAY input_data, JSAMPARRAY output_data)
+{
+  /* Copy the data */
+  jcopy_sample_rows(input_data, 0, output_data, 0,
+		    cinfo->max_v_samp_factor, cinfo->image_width);
+  /* Edge-expand */
+  expand_right_edge(output_data, cinfo->max_v_samp_factor,
+		    cinfo->image_width, compptr->width_in_blocks * DCTSIZE);
+}
+
+
+/*
+ * Downsample pixel values of a single component.
+ * This version handles the common case of 2:1 horizontal and 1:1 vertical,
+ * without smoothing.
+ *
+ * A note about the "bias" calculations: when rounding fractional values to
+ * integer, we do not want to always round 0.5 up to the next integer.
+ * If we did that, we'd introduce a noticeable bias towards larger values.
+ * Instead, this code is arranged so that 0.5 will be rounded up or down at
+ * alternate pixel locations (a simple ordered dither pattern).
+ */
+
+METHODDEF(void)
+h2v1_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
+		 JSAMPARRAY input_data, JSAMPARRAY output_data)
+{
+  int outrow;
+  JDIMENSION outcol;
+  JDIMENSION output_cols = compptr->width_in_blocks * DCTSIZE;
+  register JSAMPROW inptr, outptr;
+  register int bias;
+
+  /* Expand input data enough to let all the output samples be generated
+   * by the standard loop.  Special-casing padded output would be more
+   * efficient.
+   */
+  expand_right_edge(input_data, cinfo->max_v_samp_factor,
+		    cinfo->image_width, output_cols * 2);
+
+  for (outrow = 0; outrow < compptr->v_samp_factor; outrow++) {
+    outptr = output_data[outrow];
+    inptr = input_data[outrow];
+    bias = 0;			/* bias = 0,1,0,1,... for successive samples */
+    for (outcol = 0; outcol < output_cols; outcol++) {
+      *outptr++ = (JSAMPLE) ((GETJSAMPLE(*inptr) + GETJSAMPLE(inptr[1])
+			      + bias) >> 1);
+      bias ^= 1;		/* 0=>1, 1=>0 */
+      inptr += 2;
+    }
+  }
+}
+
+
+/*
+ * Downsample pixel values of a single component.
+ * This version handles the standard case of 2:1 horizontal and 2:1 vertical,
+ * without smoothing.
+ */
+
+METHODDEF(void)
+h2v2_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
+		 JSAMPARRAY input_data, JSAMPARRAY output_data)
+{
+  int inrow, outrow;
+  JDIMENSION outcol;
+  JDIMENSION output_cols = compptr->width_in_blocks * DCTSIZE;
+  register JSAMPROW inptr0, inptr1, outptr;
+  register int bias;
+
+  /* Expand input data enough to let all the output samples be generated
+   * by the standard loop.  Special-casing padded output would be more
+   * efficient.
+   */
+  expand_right_edge(input_data, cinfo->max_v_samp_factor,
+		    cinfo->image_width, output_cols * 2);
+
+  inrow = 0;
+  for (outrow = 0; outrow < compptr->v_samp_factor; outrow++) {
+    outptr = output_data[outrow];
+    inptr0 = input_data[inrow];
+    inptr1 = input_data[inrow+1];
+    bias = 1;			/* bias = 1,2,1,2,... for successive samples */
+    for (outcol = 0; outcol < output_cols; outcol++) {
+      *outptr++ = (JSAMPLE) ((GETJSAMPLE(*inptr0) + GETJSAMPLE(inptr0[1]) +
+			      GETJSAMPLE(*inptr1) + GETJSAMPLE(inptr1[1])
+			      + bias) >> 2);
+      bias ^= 3;		/* 1=>2, 2=>1 */
+      inptr0 += 2; inptr1 += 2;
+    }
+    inrow += 2;
+  }
+}
+
+
+#ifdef INPUT_SMOOTHING_SUPPORTED
+
+/*
+ * Downsample pixel values of a single component.
+ * This version handles the standard case of 2:1 horizontal and 2:1 vertical,
+ * with smoothing.  One row of context is required.
+ */
+
+METHODDEF(void)
+h2v2_smooth_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
+			JSAMPARRAY input_data, JSAMPARRAY output_data)
+{
+  int inrow, outrow;
+  JDIMENSION colctr;
+  JDIMENSION output_cols = compptr->width_in_blocks * DCTSIZE;
+  register JSAMPROW inptr0, inptr1, above_ptr, below_ptr, outptr;
+  INT32 membersum, neighsum, memberscale, neighscale;
+
+  /* Expand input data enough to let all the output samples be generated
+   * by the standard loop.  Special-casing padded output would be more
+   * efficient.
+   */
+  expand_right_edge(input_data - 1, cinfo->max_v_samp_factor + 2,
+		    cinfo->image_width, output_cols * 2);
+
+  /* We don't bother to form the individual "smoothed" input pixel values;
+   * we can directly compute the output which is the average of the four
+   * smoothed values.  Each of the four member pixels contributes a fraction
+   * (1-8*SF) to its own smoothed image and a fraction SF to each of the three
+   * other smoothed pixels, therefore a total fraction (1-5*SF)/4 to the final
+   * output.  The four corner-adjacent neighbor pixels contribute a fraction
+   * SF to just one smoothed pixel, or SF/4 to the final output; while the
+   * eight edge-adjacent neighbors contribute SF to each of two smoothed
+   * pixels, or SF/2 overall.  In order to use integer arithmetic, these
+   * factors are scaled by 2^16 = 65536.
+   * Also recall that SF = smoothing_factor / 1024.
+   */
+
+  memberscale = 16384 - cinfo->smoothing_factor * 80; /* scaled (1-5*SF)/4 */
+  neighscale = cinfo->smoothing_factor * 16; /* scaled SF/4 */
+
+  inrow = 0;
+  for (outrow = 0; outrow < compptr->v_samp_factor; outrow++) {
+    outptr = output_data[outrow];
+    inptr0 = input_data[inrow];
+    inptr1 = input_data[inrow+1];
+    above_ptr = input_data[inrow-1];
+    below_ptr = input_data[inrow+2];
+
+    /* Special case for first column: pretend column -1 is same as column 0 */
+    membersum = GETJSAMPLE(*inptr0) + GETJSAMPLE(inptr0[1]) +
+		GETJSAMPLE(*inptr1) + GETJSAMPLE(inptr1[1]);
+    neighsum = GETJSAMPLE(*above_ptr) + GETJSAMPLE(above_ptr[1]) +
+	       GETJSAMPLE(*below_ptr) + GETJSAMPLE(below_ptr[1]) +
+	       GETJSAMPLE(*inptr0) + GETJSAMPLE(inptr0[2]) +
+	       GETJSAMPLE(*inptr1) + GETJSAMPLE(inptr1[2]);
+    neighsum += neighsum;
+    neighsum += GETJSAMPLE(*above_ptr) + GETJSAMPLE(above_ptr[2]) +
+		GETJSAMPLE(*below_ptr) + GETJSAMPLE(below_ptr[2]);
+    membersum = membersum * memberscale + neighsum * neighscale;
+    *outptr++ = (JSAMPLE) ((membersum + 32768) >> 16);
+    inptr0 += 2; inptr1 += 2; above_ptr += 2; below_ptr += 2;
+
+    for (colctr = output_cols - 2; colctr > 0; colctr--) {
+      /* sum of pixels directly mapped to this output element */
+      membersum = GETJSAMPLE(*inptr0) + GETJSAMPLE(inptr0[1]) +
+		  GETJSAMPLE(*inptr1) + GETJSAMPLE(inptr1[1]);
+      /* sum of edge-neighbor pixels */
+      neighsum = GETJSAMPLE(*above_ptr) + GETJSAMPLE(above_ptr[1]) +
+		 GETJSAMPLE(*below_ptr) + GETJSAMPLE(below_ptr[1]) +
+		 GETJSAMPLE(inptr0[-1]) + GETJSAMPLE(inptr0[2]) +
+		 GETJSAMPLE(inptr1[-1]) + GETJSAMPLE(inptr1[2]);
+      /* The edge-neighbors count twice as much as corner-neighbors */
+      neighsum += neighsum;
+      /* Add in the corner-neighbors */
+      neighsum += GETJSAMPLE(above_ptr[-1]) + GETJSAMPLE(above_ptr[2]) +
+		  GETJSAMPLE(below_ptr[-1]) + GETJSAMPLE(below_ptr[2]);
+      /* form final output scaled up by 2^16 */
+      membersum = membersum * memberscale + neighsum * neighscale;
+      /* round, descale and output it */
+      *outptr++ = (JSAMPLE) ((membersum + 32768) >> 16);
+      inptr0 += 2; inptr1 += 2; above_ptr += 2; below_ptr += 2;
+    }
+
+    /* Special case for last column */
+    membersum = GETJSAMPLE(*inptr0) + GETJSAMPLE(inptr0[1]) +
+		GETJSAMPLE(*inptr1) + GETJSAMPLE(inptr1[1]);
+    neighsum = GETJSAMPLE(*above_ptr) + GETJSAMPLE(above_ptr[1]) +
+	       GETJSAMPLE(*below_ptr) + GETJSAMPLE(below_ptr[1]) +
+	       GETJSAMPLE(inptr0[-1]) + GETJSAMPLE(inptr0[1]) +
+	       GETJSAMPLE(inptr1[-1]) + GETJSAMPLE(inptr1[1]);
+    neighsum += neighsum;
+    neighsum += GETJSAMPLE(above_ptr[-1]) + GETJSAMPLE(above_ptr[1]) +
+		GETJSAMPLE(below_ptr[-1]) + GETJSAMPLE(below_ptr[1]);
+    membersum = membersum * memberscale + neighsum * neighscale;
+    *outptr = (JSAMPLE) ((membersum + 32768) >> 16);
+
+    inrow += 2;
+  }
+}
+
+
+/*
+ * Downsample pixel values of a single component.
+ * This version handles the special case of a full-size component,
+ * with smoothing.  One row of context is required.
+ */
+
+METHODDEF(void)
+fullsize_smooth_downsample (j_compress_ptr cinfo, jpeg_component_info *compptr,
+			    JSAMPARRAY input_data, JSAMPARRAY output_data)
+{
+  int outrow;
+  JDIMENSION colctr;
+  JDIMENSION output_cols = compptr->width_in_blocks * DCTSIZE;
+  register JSAMPROW inptr, above_ptr, below_ptr, outptr;
+  INT32 membersum, neighsum, memberscale, neighscale;
+  int colsum, lastcolsum, nextcolsum;
+
+  /* Expand input data enough to let all the output samples be generated
+   * by the standard loop.  Special-casing padded output would be more
+   * efficient.
+   */
+  expand_right_edge(input_data - 1, cinfo->max_v_samp_factor + 2,
+		    cinfo->image_width, output_cols);
+
+  /* Each of the eight neighbor pixels contributes a fraction SF to the
+   * smoothed pixel, while the main pixel contributes (1-8*SF).  In order
+   * to use integer arithmetic, these factors are multiplied by 2^16 = 65536.
+   * Also recall that SF = smoothing_factor / 1024.
+   */
+
+  memberscale = 65536L - cinfo->smoothing_factor * 512L; /* scaled 1-8*SF */
+  neighscale = cinfo->smoothing_factor * 64; /* scaled SF */
+
+  for (outrow = 0; outrow < compptr->v_samp_factor; outrow++) {
+    outptr = output_data[outrow];
+    inptr = input_data[outrow];
+    above_ptr = input_data[outrow-1];
+    below_ptr = input_data[outrow+1];
+
+    /* Special case for first column */
+    colsum = GETJSAMPLE(*above_ptr++) + GETJSAMPLE(*below_ptr++) +
+	     GETJSAMPLE(*inptr);
+    membersum = GETJSAMPLE(*inptr++);
+    nextcolsum = GETJSAMPLE(*above_ptr) + GETJSAMPLE(*below_ptr) +
+		 GETJSAMPLE(*inptr);
+    neighsum = colsum + (colsum - membersum) + nextcolsum;
+    membersum = membersum * memberscale + neighsum * neighscale;
+    *outptr++ = (JSAMPLE) ((membersum + 32768) >> 16);
+    lastcolsum = colsum; colsum = nextcolsum;
+
+    for (colctr = output_cols - 2; colctr > 0; colctr--) {
+      membersum = GETJSAMPLE(*inptr++);
+      above_ptr++; below_ptr++;
+      nextcolsum = GETJSAMPLE(*above_ptr) + GETJSAMPLE(*below_ptr) +
+		   GETJSAMPLE(*inptr);
+      neighsum = lastcolsum + (colsum - membersum) + nextcolsum;
+      membersum = membersum * memberscale + neighsum * neighscale;
+      *outptr++ = (JSAMPLE) ((membersum + 32768) >> 16);
+      lastcolsum = colsum; colsum = nextcolsum;
+    }
+
+    /* Special case for last column */
+    membersum = GETJSAMPLE(*inptr);
+    neighsum = lastcolsum + (colsum - membersum) + colsum;
+    membersum = membersum * memberscale + neighsum * neighscale;
+    *outptr = (JSAMPLE) ((membersum + 32768) >> 16);
+
+  }
+}
+
+#endif /* INPUT_SMOOTHING_SUPPORTED */
+
+
+/*
+ * Module initialization routine for downsampling.
+ * Note that we must select a routine for each component.
+ */
+
+GLOBAL(void)
+jinit_downsampler (j_compress_ptr cinfo)
+{
+  my_downsample_ptr downsample;
+  int ci;
+  jpeg_component_info * compptr;
+  boolean smoothok = TRUE;
+
+  downsample = (my_downsample_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				SIZEOF(my_downsampler));
+  cinfo->downsample = (struct jpeg_downsampler *) downsample;
+  downsample->pub.start_pass = start_pass_downsample;
+  downsample->pub.downsample = sep_downsample;
+  downsample->pub.need_context_rows = FALSE;
+
+  if (cinfo->CCIR601_sampling)
+    ERREXIT(cinfo, JERR_CCIR601_NOTIMPL);
+
+  /* Verify we can handle the sampling factors, and set up method pointers */
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    if (compptr->h_samp_factor == cinfo->max_h_samp_factor &&
+	compptr->v_samp_factor == cinfo->max_v_samp_factor) {
+#ifdef INPUT_SMOOTHING_SUPPORTED
+      if (cinfo->smoothing_factor) {
+	downsample->methods[ci] = fullsize_smooth_downsample;
+	downsample->pub.need_context_rows = TRUE;
+      } else
+#endif
+	downsample->methods[ci] = fullsize_downsample;
+    } else if (compptr->h_samp_factor * 2 == cinfo->max_h_samp_factor &&
+	       compptr->v_samp_factor == cinfo->max_v_samp_factor) {
+      smoothok = FALSE;
+      if (jsimd_can_h2v1_downsample())
+        downsample->methods[ci] = jsimd_h2v1_downsample;
+      else
+        downsample->methods[ci] = h2v1_downsample;
+    } else if (compptr->h_samp_factor * 2 == cinfo->max_h_samp_factor &&
+	       compptr->v_samp_factor * 2 == cinfo->max_v_samp_factor) {
+#ifdef INPUT_SMOOTHING_SUPPORTED
+      if (cinfo->smoothing_factor) {
+	downsample->methods[ci] = h2v2_smooth_downsample;
+	downsample->pub.need_context_rows = TRUE;
+      } else
+#endif
+	if (jsimd_can_h2v2_downsample())
+	  downsample->methods[ci] = jsimd_h2v2_downsample;
+	else
+	  downsample->methods[ci] = h2v2_downsample;
+    } else if ((cinfo->max_h_samp_factor % compptr->h_samp_factor) == 0 &&
+	       (cinfo->max_v_samp_factor % compptr->v_samp_factor) == 0) {
+      smoothok = FALSE;
+      downsample->methods[ci] = int_downsample;
+    } else
+      ERREXIT(cinfo, JERR_FRACT_SAMPLE_NOTIMPL);
+  }
+
+#ifdef INPUT_SMOOTHING_SUPPORTED
+  if (cinfo->smoothing_factor && !smoothok)
+    TRACEMS(cinfo, 0, JTRC_SMOOTH_NOTIMPL);
+#endif
+}
diff --git a/src/libjpeg-turbo/jctrans.c b/src/libjpeg-turbo/jctrans.c
new file mode 100644
index 0000000..916e872
--- /dev/null
+++ b/src/libjpeg-turbo/jctrans.c
@@ -0,0 +1,399 @@
+/*
+ * jctrans.c
+ *
+ * Copyright (C) 1995-1998, Thomas G. Lane.
+ * Modified 2000-2009 by Guido Vollbeding.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains library routines for transcoding compression,
+ * that is, writing raw DCT coefficient arrays to an output JPEG file.
+ * The routines in jcapimin.c will also be needed by a transcoder.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+
+
+/* Forward declarations */
+LOCAL(void) transencode_master_selection
+	JPP((j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays));
+LOCAL(void) transencode_coef_controller
+	JPP((j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays));
+
+
+/*
+ * Compression initialization for writing raw-coefficient data.
+ * Before calling this, all parameters and a data destination must be set up.
+ * Call jpeg_finish_compress() to actually write the data.
+ *
+ * The number of passed virtual arrays must match cinfo->num_components.
+ * Note that the virtual arrays need not be filled or even realized at
+ * the time write_coefficients is called; indeed, if the virtual arrays
+ * were requested from this compression object's memory manager, they
+ * typically will be realized during this routine and filled afterwards.
+ */
+
+GLOBAL(void)
+jpeg_write_coefficients (j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays)
+{
+  if (cinfo->global_state != CSTATE_START)
+    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
+  /* Mark all tables to be written */
+  jpeg_suppress_tables(cinfo, FALSE);
+  /* (Re)initialize error mgr and destination modules */
+  (*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo);
+  (*cinfo->dest->init_destination) (cinfo);
+  /* Perform master selection of active modules */
+  transencode_master_selection(cinfo, coef_arrays);
+  /* Wait for jpeg_finish_compress() call */
+  cinfo->next_scanline = 0;	/* so jpeg_write_marker works */
+  cinfo->global_state = CSTATE_WRCOEFS;
+}
+
+
+/*
+ * Initialize the compression object with default parameters,
+ * then copy from the source object all parameters needed for lossless
+ * transcoding.  Parameters that can be varied without loss (such as
+ * scan script and Huffman optimization) are left in their default states.
+ */
+
+GLOBAL(void)
+jpeg_copy_critical_parameters (j_decompress_ptr srcinfo,
+			       j_compress_ptr dstinfo)
+{
+  JQUANT_TBL ** qtblptr;
+  jpeg_component_info *incomp, *outcomp;
+  JQUANT_TBL *c_quant, *slot_quant;
+  int tblno, ci, coefi;
+
+  /* Safety check to ensure start_compress not called yet. */
+  if (dstinfo->global_state != CSTATE_START)
+    ERREXIT1(dstinfo, JERR_BAD_STATE, dstinfo->global_state);
+  /* Copy fundamental image dimensions */
+  dstinfo->image_width = srcinfo->image_width;
+  dstinfo->image_height = srcinfo->image_height;
+  dstinfo->input_components = srcinfo->num_components;
+  dstinfo->in_color_space = srcinfo->jpeg_color_space;
+#if JPEG_LIB_VERSION >= 70
+  dstinfo->jpeg_width = srcinfo->output_width;
+  dstinfo->jpeg_height = srcinfo->output_height;
+  dstinfo->min_DCT_h_scaled_size = srcinfo->min_DCT_h_scaled_size;
+  dstinfo->min_DCT_v_scaled_size = srcinfo->min_DCT_v_scaled_size;
+#endif
+  /* Initialize all parameters to default values */
+  jpeg_set_defaults(dstinfo);
+  /* jpeg_set_defaults may choose wrong colorspace, eg YCbCr if input is RGB.
+   * Fix it to get the right header markers for the image colorspace.
+   */
+  jpeg_set_colorspace(dstinfo, srcinfo->jpeg_color_space);
+  dstinfo->data_precision = srcinfo->data_precision;
+  dstinfo->CCIR601_sampling = srcinfo->CCIR601_sampling;
+  /* Copy the source's quantization tables. */
+  for (tblno = 0; tblno < NUM_QUANT_TBLS; tblno++) {
+    if (srcinfo->quant_tbl_ptrs[tblno] != NULL) {
+      qtblptr = & dstinfo->quant_tbl_ptrs[tblno];
+      if (*qtblptr == NULL)
+	*qtblptr = jpeg_alloc_quant_table((j_common_ptr) dstinfo);
+      MEMCOPY((*qtblptr)->quantval,
+	      srcinfo->quant_tbl_ptrs[tblno]->quantval,
+	      SIZEOF((*qtblptr)->quantval));
+      (*qtblptr)->sent_table = FALSE;
+    }
+  }
+  /* Copy the source's per-component info.
+   * Note we assume jpeg_set_defaults has allocated the dest comp_info array.
+   */
+  dstinfo->num_components = srcinfo->num_components;
+  if (dstinfo->num_components < 1 || dstinfo->num_components > MAX_COMPONENTS)
+    ERREXIT2(dstinfo, JERR_COMPONENT_COUNT, dstinfo->num_components,
+	     MAX_COMPONENTS);
+  for (ci = 0, incomp = srcinfo->comp_info, outcomp = dstinfo->comp_info;
+       ci < dstinfo->num_components; ci++, incomp++, outcomp++) {
+    outcomp->component_id = incomp->component_id;
+    outcomp->h_samp_factor = incomp->h_samp_factor;
+    outcomp->v_samp_factor = incomp->v_samp_factor;
+    outcomp->quant_tbl_no = incomp->quant_tbl_no;
+    /* Make sure saved quantization table for component matches the qtable
+     * slot.  If not, the input file re-used this qtable slot.
+     * IJG encoder currently cannot duplicate this.
+     */
+    tblno = outcomp->quant_tbl_no;
+    if (tblno < 0 || tblno >= NUM_QUANT_TBLS ||
+	srcinfo->quant_tbl_ptrs[tblno] == NULL)
+      ERREXIT1(dstinfo, JERR_NO_QUANT_TABLE, tblno);
+    slot_quant = srcinfo->quant_tbl_ptrs[tblno];
+    c_quant = incomp->quant_table;
+    if (c_quant != NULL) {
+      for (coefi = 0; coefi < DCTSIZE2; coefi++) {
+	if (c_quant->quantval[coefi] != slot_quant->quantval[coefi])
+	  ERREXIT1(dstinfo, JERR_MISMATCHED_QUANT_TABLE, tblno);
+      }
+    }
+    /* Note: we do not copy the source's Huffman table assignments;
+     * instead we rely on jpeg_set_colorspace to have made a suitable choice.
+     */
+  }
+  /* Also copy JFIF version and resolution information, if available.
+   * Strictly speaking this isn't "critical" info, but it's nearly
+   * always appropriate to copy it if available.  In particular,
+   * if the application chooses to copy JFIF 1.02 extension markers from
+   * the source file, we need to copy the version to make sure we don't
+   * emit a file that has 1.02 extensions but a claimed version of 1.01.
+   * We will *not*, however, copy version info from mislabeled "2.01" files.
+   */
+  if (srcinfo->saw_JFIF_marker) {
+    if (srcinfo->JFIF_major_version == 1) {
+      dstinfo->JFIF_major_version = srcinfo->JFIF_major_version;
+      dstinfo->JFIF_minor_version = srcinfo->JFIF_minor_version;
+    }
+    dstinfo->density_unit = srcinfo->density_unit;
+    dstinfo->X_density = srcinfo->X_density;
+    dstinfo->Y_density = srcinfo->Y_density;
+  }
+}
+
+
+/*
+ * Master selection of compression modules for transcoding.
+ * This substitutes for jcinit.c's initialization of the full compressor.
+ */
+
+LOCAL(void)
+transencode_master_selection (j_compress_ptr cinfo,
+			      jvirt_barray_ptr * coef_arrays)
+{
+  /* Although we don't actually use input_components for transcoding,
+   * jcmaster.c's initial_setup will complain if input_components is 0.
+   */
+  cinfo->input_components = 1;
+  /* Initialize master control (includes parameter checking/processing) */
+  jinit_c_master_control(cinfo, TRUE /* transcode only */);
+
+  /* Entropy encoding: either Huffman or arithmetic coding. */
+  if (cinfo->arith_code) {
+#ifdef C_ARITH_CODING_SUPPORTED
+    jinit_arith_encoder(cinfo);
+#else
+    ERREXIT(cinfo, JERR_ARITH_NOTIMPL);
+#endif
+  } else {
+    if (cinfo->progressive_mode) {
+#ifdef C_PROGRESSIVE_SUPPORTED
+      jinit_phuff_encoder(cinfo);
+#else
+      ERREXIT(cinfo, JERR_NOT_COMPILED);
+#endif
+    } else
+      jinit_huff_encoder(cinfo);
+  }
+
+  /* We need a special coefficient buffer controller. */
+  transencode_coef_controller(cinfo, coef_arrays);
+
+  jinit_marker_writer(cinfo);
+
+  /* We can now tell the memory manager to allocate virtual arrays. */
+  (*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo);
+
+  /* Write the datastream header (SOI, JFIF) immediately.
+   * Frame and scan headers are postponed till later.
+   * This lets application insert special markers after the SOI.
+   */
+  (*cinfo->marker->write_file_header) (cinfo);
+}
+
+
+/*
+ * The rest of this file is a special implementation of the coefficient
+ * buffer controller.  This is similar to jccoefct.c, but it handles only
+ * output from presupplied virtual arrays.  Furthermore, we generate any
+ * dummy padding blocks on-the-fly rather than expecting them to be present
+ * in the arrays.
+ */
+
+/* Private buffer controller object */
+
+typedef struct {
+  struct jpeg_c_coef_controller pub; /* public fields */
+
+  JDIMENSION iMCU_row_num;	/* iMCU row # within image */
+  JDIMENSION mcu_ctr;		/* counts MCUs processed in current row */
+  int MCU_vert_offset;		/* counts MCU rows within iMCU row */
+  int MCU_rows_per_iMCU_row;	/* number of such rows needed */
+
+  /* Virtual block array for each component. */
+  jvirt_barray_ptr * whole_image;
+
+  /* Workspace for constructing dummy blocks at right/bottom edges. */
+  JBLOCKROW dummy_buffer[C_MAX_BLOCKS_IN_MCU];
+} my_coef_controller;
+
+typedef my_coef_controller * my_coef_ptr;
+
+
+LOCAL(void)
+start_iMCU_row (j_compress_ptr cinfo)
+/* Reset within-iMCU-row counters for a new row */
+{
+  my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
+
+  /* In an interleaved scan, an MCU row is the same as an iMCU row.
+   * In a noninterleaved scan, an iMCU row has v_samp_factor MCU rows.
+   * But at the bottom of the image, process only what's left.
+   */
+  if (cinfo->comps_in_scan > 1) {
+    coef->MCU_rows_per_iMCU_row = 1;
+  } else {
+    if (coef->iMCU_row_num < (cinfo->total_iMCU_rows-1))
+      coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->v_samp_factor;
+    else
+      coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->last_row_height;
+  }
+
+  coef->mcu_ctr = 0;
+  coef->MCU_vert_offset = 0;
+}
+
+
+/*
+ * Initialize for a processing pass.
+ */
+
+METHODDEF(void)
+start_pass_coef (j_compress_ptr cinfo, J_BUF_MODE pass_mode)
+{
+  my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
+
+  if (pass_mode != JBUF_CRANK_DEST)
+    ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
+
+  coef->iMCU_row_num = 0;
+  start_iMCU_row(cinfo);
+}
+
+
+/*
+ * Process some data.
+ * We process the equivalent of one fully interleaved MCU row ("iMCU" row)
+ * per call, ie, v_samp_factor block rows for each component in the scan.
+ * The data is obtained from the virtual arrays and fed to the entropy coder.
+ * Returns TRUE if the iMCU row is completed, FALSE if suspended.
+ *
+ * NB: input_buf is ignored; it is likely to be a NULL pointer.
+ */
+
+METHODDEF(boolean)
+compress_output (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
+{
+  my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
+  JDIMENSION MCU_col_num;	/* index of current MCU within row */
+  JDIMENSION last_MCU_col = cinfo->MCUs_per_row - 1;
+  JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1;
+  int blkn, ci, xindex, yindex, yoffset, blockcnt;
+  JDIMENSION start_col;
+  JBLOCKARRAY buffer[MAX_COMPS_IN_SCAN];
+  JBLOCKROW MCU_buffer[C_MAX_BLOCKS_IN_MCU];
+  JBLOCKROW buffer_ptr;
+  jpeg_component_info *compptr;
+
+  /* Align the virtual buffers for the components used in this scan. */
+  for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
+    compptr = cinfo->cur_comp_info[ci];
+    buffer[ci] = (*cinfo->mem->access_virt_barray)
+      ((j_common_ptr) cinfo, coef->whole_image[compptr->component_index],
+       coef->iMCU_row_num * compptr->v_samp_factor,
+       (JDIMENSION) compptr->v_samp_factor, FALSE);
+  }
+
+  /* Loop to process one whole iMCU row */
+  for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row;
+       yoffset++) {
+    for (MCU_col_num = coef->mcu_ctr; MCU_col_num < cinfo->MCUs_per_row;
+	 MCU_col_num++) {
+      /* Construct list of pointers to DCT blocks belonging to this MCU */
+      blkn = 0;			/* index of current DCT block within MCU */
+      for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
+	compptr = cinfo->cur_comp_info[ci];
+	start_col = MCU_col_num * compptr->MCU_width;
+	blockcnt = (MCU_col_num < last_MCU_col) ? compptr->MCU_width
+						: compptr->last_col_width;
+	for (yindex = 0; yindex < compptr->MCU_height; yindex++) {
+	  if (coef->iMCU_row_num < last_iMCU_row ||
+	      yindex+yoffset < compptr->last_row_height) {
+	    /* Fill in pointers to real blocks in this row */
+	    buffer_ptr = buffer[ci][yindex+yoffset] + start_col;
+	    for (xindex = 0; xindex < blockcnt; xindex++)
+	      MCU_buffer[blkn++] = buffer_ptr++;
+	  } else {
+	    /* At bottom of image, need a whole row of dummy blocks */
+	    xindex = 0;
+	  }
+	  /* Fill in any dummy blocks needed in this row.
+	   * Dummy blocks are filled in the same way as in jccoefct.c:
+	   * all zeroes in the AC entries, DC entries equal to previous
+	   * block's DC value.  The init routine has already zeroed the
+	   * AC entries, so we need only set the DC entries correctly.
+	   */
+	  for (; xindex < compptr->MCU_width; xindex++) {
+	    MCU_buffer[blkn] = coef->dummy_buffer[blkn];
+	    MCU_buffer[blkn][0][0] = MCU_buffer[blkn-1][0][0];
+	    blkn++;
+	  }
+	}
+      }
+      /* Try to write the MCU. */
+      if (! (*cinfo->entropy->encode_mcu) (cinfo, MCU_buffer)) {
+	/* Suspension forced; update state counters and exit */
+	coef->MCU_vert_offset = yoffset;
+	coef->mcu_ctr = MCU_col_num;
+	return FALSE;
+      }
+    }
+    /* Completed an MCU row, but perhaps not an iMCU row */
+    coef->mcu_ctr = 0;
+  }
+  /* Completed the iMCU row, advance counters for next one */
+  coef->iMCU_row_num++;
+  start_iMCU_row(cinfo);
+  return TRUE;
+}
+
+
+/*
+ * Initialize coefficient buffer controller.
+ *
+ * Each passed coefficient array must be the right size for that
+ * coefficient: width_in_blocks wide and height_in_blocks high,
+ * with unitheight at least v_samp_factor.
+ */
+
+LOCAL(void)
+transencode_coef_controller (j_compress_ptr cinfo,
+			     jvirt_barray_ptr * coef_arrays)
+{
+  my_coef_ptr coef;
+  JBLOCKROW buffer;
+  int i;
+
+  coef = (my_coef_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				SIZEOF(my_coef_controller));
+  cinfo->coef = (struct jpeg_c_coef_controller *) coef;
+  coef->pub.start_pass = start_pass_coef;
+  coef->pub.compress_data = compress_output;
+
+  /* Save pointer to virtual arrays */
+  coef->whole_image = coef_arrays;
+
+  /* Allocate and pre-zero space for dummy DCT blocks. */
+  buffer = (JBLOCKROW)
+    (*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				C_MAX_BLOCKS_IN_MCU * SIZEOF(JBLOCK));
+  jzero_far((void FAR *) buffer, C_MAX_BLOCKS_IN_MCU * SIZEOF(JBLOCK));
+  for (i = 0; i < C_MAX_BLOCKS_IN_MCU; i++) {
+    coef->dummy_buffer[i] = buffer + i;
+  }
+}
diff --git a/src/libjpeg-turbo/jdapimin.c b/src/libjpeg-turbo/jdapimin.c
new file mode 100644
index 0000000..cadb59f
--- /dev/null
+++ b/src/libjpeg-turbo/jdapimin.c
@@ -0,0 +1,395 @@
+/*
+ * jdapimin.c
+ *
+ * Copyright (C) 1994-1998, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains application interface code for the decompression half
+ * of the JPEG library.  These are the "minimum" API routines that may be
+ * needed in either the normal full-decompression case or the
+ * transcoding-only case.
+ *
+ * Most of the routines intended to be called directly by an application
+ * are in this file or in jdapistd.c.  But also see jcomapi.c for routines
+ * shared by compression and decompression, and jdtrans.c for the transcoding
+ * case.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+
+
+/*
+ * Initialization of a JPEG decompression object.
+ * The error manager must already be set up (in case memory manager fails).
+ */
+
+GLOBAL(void)
+jpeg_CreateDecompress (j_decompress_ptr cinfo, int version, size_t structsize)
+{
+  int i;
+
+  /* Guard against version mismatches between library and caller. */
+  cinfo->mem = NULL;		/* so jpeg_destroy knows mem mgr not called */
+  if (version != JPEG_LIB_VERSION)
+    ERREXIT2(cinfo, JERR_BAD_LIB_VERSION, JPEG_LIB_VERSION, version);
+  if (structsize != SIZEOF(struct jpeg_decompress_struct))
+    ERREXIT2(cinfo, JERR_BAD_STRUCT_SIZE, 
+	     (int) SIZEOF(struct jpeg_decompress_struct), (int) structsize);
+
+  /* For debugging purposes, we zero the whole master structure.
+   * But the application has already set the err pointer, and may have set
+   * client_data, so we have to save and restore those fields.
+   * Note: if application hasn't set client_data, tools like Purify may
+   * complain here.
+   */
+  {
+    struct jpeg_error_mgr * err = cinfo->err;
+    void * client_data = cinfo->client_data; /* ignore Purify complaint here */
+    MEMZERO(cinfo, SIZEOF(struct jpeg_decompress_struct));
+    cinfo->err = err;
+    cinfo->client_data = client_data;
+  }
+  cinfo->is_decompressor = TRUE;
+
+  /* Initialize a memory manager instance for this object */
+  jinit_memory_mgr((j_common_ptr) cinfo);
+
+  /* Zero out pointers to permanent structures. */
+  cinfo->progress = NULL;
+  cinfo->src = NULL;
+
+  for (i = 0; i < NUM_QUANT_TBLS; i++)
+    cinfo->quant_tbl_ptrs[i] = NULL;
+
+  for (i = 0; i < NUM_HUFF_TBLS; i++) {
+    cinfo->dc_huff_tbl_ptrs[i] = NULL;
+    cinfo->ac_huff_tbl_ptrs[i] = NULL;
+  }
+
+  /* Initialize marker processor so application can override methods
+   * for COM, APPn markers before calling jpeg_read_header.
+   */
+  cinfo->marker_list = NULL;
+  jinit_marker_reader(cinfo);
+
+  /* And initialize the overall input controller. */
+  jinit_input_controller(cinfo);
+
+  /* OK, I'm ready */
+  cinfo->global_state = DSTATE_START;
+}
+
+
+/*
+ * Destruction of a JPEG decompression object
+ */
+
+GLOBAL(void)
+jpeg_destroy_decompress (j_decompress_ptr cinfo)
+{
+  jpeg_destroy((j_common_ptr) cinfo); /* use common routine */
+}
+
+
+/*
+ * Abort processing of a JPEG decompression operation,
+ * but don't destroy the object itself.
+ */
+
+GLOBAL(void)
+jpeg_abort_decompress (j_decompress_ptr cinfo)
+{
+  jpeg_abort((j_common_ptr) cinfo); /* use common routine */
+}
+
+
+/*
+ * Set default decompression parameters.
+ */
+
+LOCAL(void)
+default_decompress_parms (j_decompress_ptr cinfo)
+{
+  /* Guess the input colorspace, and set output colorspace accordingly. */
+  /* (Wish JPEG committee had provided a real way to specify this...) */
+  /* Note application may override our guesses. */
+  switch (cinfo->num_components) {
+  case 1:
+    cinfo->jpeg_color_space = JCS_GRAYSCALE;
+    cinfo->out_color_space = JCS_GRAYSCALE;
+    break;
+    
+  case 3:
+    if (cinfo->saw_JFIF_marker) {
+      cinfo->jpeg_color_space = JCS_YCbCr; /* JFIF implies YCbCr */
+    } else if (cinfo->saw_Adobe_marker) {
+      switch (cinfo->Adobe_transform) {
+      case 0:
+	cinfo->jpeg_color_space = JCS_RGB;
+	break;
+      case 1:
+	cinfo->jpeg_color_space = JCS_YCbCr;
+	break;
+      default:
+	WARNMS1(cinfo, JWRN_ADOBE_XFORM, cinfo->Adobe_transform);
+	cinfo->jpeg_color_space = JCS_YCbCr; /* assume it's YCbCr */
+	break;
+      }
+    } else {
+      /* Saw no special markers, try to guess from the component IDs */
+      int cid0 = cinfo->comp_info[0].component_id;
+      int cid1 = cinfo->comp_info[1].component_id;
+      int cid2 = cinfo->comp_info[2].component_id;
+
+      if (cid0 == 1 && cid1 == 2 && cid2 == 3)
+	cinfo->jpeg_color_space = JCS_YCbCr; /* assume JFIF w/out marker */
+      else if (cid0 == 82 && cid1 == 71 && cid2 == 66)
+	cinfo->jpeg_color_space = JCS_RGB; /* ASCII 'R', 'G', 'B' */
+      else {
+	TRACEMS3(cinfo, 1, JTRC_UNKNOWN_IDS, cid0, cid1, cid2);
+	cinfo->jpeg_color_space = JCS_YCbCr; /* assume it's YCbCr */
+      }
+    }
+    /* Always guess RGB is proper output colorspace. */
+    cinfo->out_color_space = JCS_RGB;
+    break;
+    
+  case 4:
+    if (cinfo->saw_Adobe_marker) {
+      switch (cinfo->Adobe_transform) {
+      case 0:
+	cinfo->jpeg_color_space = JCS_CMYK;
+	break;
+      case 2:
+	cinfo->jpeg_color_space = JCS_YCCK;
+	break;
+      default:
+	WARNMS1(cinfo, JWRN_ADOBE_XFORM, cinfo->Adobe_transform);
+	cinfo->jpeg_color_space = JCS_YCCK; /* assume it's YCCK */
+	break;
+      }
+    } else {
+      /* No special markers, assume straight CMYK. */
+      cinfo->jpeg_color_space = JCS_CMYK;
+    }
+    cinfo->out_color_space = JCS_CMYK;
+    break;
+    
+  default:
+    cinfo->jpeg_color_space = JCS_UNKNOWN;
+    cinfo->out_color_space = JCS_UNKNOWN;
+    break;
+  }
+
+  /* Set defaults for other decompression parameters. */
+  cinfo->scale_num = 1;		/* 1:1 scaling */
+  cinfo->scale_denom = 1;
+  cinfo->output_gamma = 1.0;
+  cinfo->buffered_image = FALSE;
+  cinfo->raw_data_out = FALSE;
+  cinfo->dct_method = JDCT_DEFAULT;
+  cinfo->do_fancy_upsampling = TRUE;
+  cinfo->do_block_smoothing = TRUE;
+  cinfo->quantize_colors = FALSE;
+  /* We set these in case application only sets quantize_colors. */
+  cinfo->dither_mode = JDITHER_FS;
+#ifdef QUANT_2PASS_SUPPORTED
+  cinfo->two_pass_quantize = TRUE;
+#else
+  cinfo->two_pass_quantize = FALSE;
+#endif
+  cinfo->desired_number_of_colors = 256;
+  cinfo->colormap = NULL;
+  /* Initialize for no mode change in buffered-image mode. */
+  cinfo->enable_1pass_quant = FALSE;
+  cinfo->enable_external_quant = FALSE;
+  cinfo->enable_2pass_quant = FALSE;
+}
+
+
+/*
+ * Decompression startup: read start of JPEG datastream to see what's there.
+ * Need only initialize JPEG object and supply a data source before calling.
+ *
+ * This routine will read as far as the first SOS marker (ie, actual start of
+ * compressed data), and will save all tables and parameters in the JPEG
+ * object.  It will also initialize the decompression parameters to default
+ * values, and finally return JPEG_HEADER_OK.  On return, the application may
+ * adjust the decompression parameters and then call jpeg_start_decompress.
+ * (Or, if the application only wanted to determine the image parameters,
+ * the data need not be decompressed.  In that case, call jpeg_abort or
+ * jpeg_destroy to release any temporary space.)
+ * If an abbreviated (tables only) datastream is presented, the routine will
+ * return JPEG_HEADER_TABLES_ONLY upon reaching EOI.  The application may then
+ * re-use the JPEG object to read the abbreviated image datastream(s).
+ * It is unnecessary (but OK) to call jpeg_abort in this case.
+ * The JPEG_SUSPENDED return code only occurs if the data source module
+ * requests suspension of the decompressor.  In this case the application
+ * should load more source data and then re-call jpeg_read_header to resume
+ * processing.
+ * If a non-suspending data source is used and require_image is TRUE, then the
+ * return code need not be inspected since only JPEG_HEADER_OK is possible.
+ *
+ * This routine is now just a front end to jpeg_consume_input, with some
+ * extra error checking.
+ */
+
+GLOBAL(int)
+jpeg_read_header (j_decompress_ptr cinfo, boolean require_image)
+{
+  int retcode;
+
+  if (cinfo->global_state != DSTATE_START &&
+      cinfo->global_state != DSTATE_INHEADER)
+    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
+
+  retcode = jpeg_consume_input(cinfo);
+
+  switch (retcode) {
+  case JPEG_REACHED_SOS:
+    retcode = JPEG_HEADER_OK;
+    break;
+  case JPEG_REACHED_EOI:
+    if (require_image)		/* Complain if application wanted an image */
+      ERREXIT(cinfo, JERR_NO_IMAGE);
+    /* Reset to start state; it would be safer to require the application to
+     * call jpeg_abort, but we can't change it now for compatibility reasons.
+     * A side effect is to free any temporary memory (there shouldn't be any).
+     */
+    jpeg_abort((j_common_ptr) cinfo); /* sets state = DSTATE_START */
+    retcode = JPEG_HEADER_TABLES_ONLY;
+    break;
+  case JPEG_SUSPENDED:
+    /* no work */
+    break;
+  }
+
+  return retcode;
+}
+
+
+/*
+ * Consume data in advance of what the decompressor requires.
+ * This can be called at any time once the decompressor object has
+ * been created and a data source has been set up.
+ *
+ * This routine is essentially a state machine that handles a couple
+ * of critical state-transition actions, namely initial setup and
+ * transition from header scanning to ready-for-start_decompress.
+ * All the actual input is done via the input controller's consume_input
+ * method.
+ */
+
+GLOBAL(int)
+jpeg_consume_input (j_decompress_ptr cinfo)
+{
+  int retcode = JPEG_SUSPENDED;
+
+  /* NB: every possible DSTATE value should be listed in this switch */
+  switch (cinfo->global_state) {
+  case DSTATE_START:
+    /* Start-of-datastream actions: reset appropriate modules */
+    (*cinfo->inputctl->reset_input_controller) (cinfo);
+    /* Initialize application's data source module */
+    (*cinfo->src->init_source) (cinfo);
+    cinfo->global_state = DSTATE_INHEADER;
+    /*FALLTHROUGH*/
+  case DSTATE_INHEADER:
+    retcode = (*cinfo->inputctl->consume_input) (cinfo);
+    if (retcode == JPEG_REACHED_SOS) { /* Found SOS, prepare to decompress */
+      /* Set up default parameters based on header data */
+      default_decompress_parms(cinfo);
+      /* Set global state: ready for start_decompress */
+      cinfo->global_state = DSTATE_READY;
+    }
+    break;
+  case DSTATE_READY:
+    /* Can't advance past first SOS until start_decompress is called */
+    retcode = JPEG_REACHED_SOS;
+    break;
+  case DSTATE_PRELOAD:
+  case DSTATE_PRESCAN:
+  case DSTATE_SCANNING:
+  case DSTATE_RAW_OK:
+  case DSTATE_BUFIMAGE:
+  case DSTATE_BUFPOST:
+  case DSTATE_STOPPING:
+    retcode = (*cinfo->inputctl->consume_input) (cinfo);
+    break;
+  default:
+    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
+  }
+  return retcode;
+}
+
+
+/*
+ * Have we finished reading the input file?
+ */
+
+GLOBAL(boolean)
+jpeg_input_complete (j_decompress_ptr cinfo)
+{
+  /* Check for valid jpeg object */
+  if (cinfo->global_state < DSTATE_START ||
+      cinfo->global_state > DSTATE_STOPPING)
+    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
+  return cinfo->inputctl->eoi_reached;
+}
+
+
+/*
+ * Is there more than one scan?
+ */
+
+GLOBAL(boolean)
+jpeg_has_multiple_scans (j_decompress_ptr cinfo)
+{
+  /* Only valid after jpeg_read_header completes */
+  if (cinfo->global_state < DSTATE_READY ||
+      cinfo->global_state > DSTATE_STOPPING)
+    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
+  return cinfo->inputctl->has_multiple_scans;
+}
+
+
+/*
+ * Finish JPEG decompression.
+ *
+ * This will normally just verify the file trailer and release temp storage.
+ *
+ * Returns FALSE if suspended.  The return value need be inspected only if
+ * a suspending data source is used.
+ */
+
+GLOBAL(boolean)
+jpeg_finish_decompress (j_decompress_ptr cinfo)
+{
+  if ((cinfo->global_state == DSTATE_SCANNING ||
+       cinfo->global_state == DSTATE_RAW_OK) && ! cinfo->buffered_image) {
+    /* Terminate final pass of non-buffered mode */
+    if (cinfo->output_scanline < cinfo->output_height)
+      ERREXIT(cinfo, JERR_TOO_LITTLE_DATA);
+    (*cinfo->master->finish_output_pass) (cinfo);
+    cinfo->global_state = DSTATE_STOPPING;
+  } else if (cinfo->global_state == DSTATE_BUFIMAGE) {
+    /* Finishing after a buffered-image operation */
+    cinfo->global_state = DSTATE_STOPPING;
+  } else if (cinfo->global_state != DSTATE_STOPPING) {
+    /* STOPPING = repeat call after a suspension, anything else is error */
+    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
+  }
+  /* Read until EOI */
+  while (! cinfo->inputctl->eoi_reached) {
+    if ((*cinfo->inputctl->consume_input) (cinfo) == JPEG_SUSPENDED)
+      return FALSE;		/* Suspend, come back later */
+  }
+  /* Do final cleanup */
+  (*cinfo->src->term_source) (cinfo);
+  /* We can use jpeg_abort to release memory and reset global_state */
+  jpeg_abort((j_common_ptr) cinfo);
+  return TRUE;
+}
diff --git a/src/libjpeg-turbo/jdapistd.c b/src/libjpeg-turbo/jdapistd.c
new file mode 100644
index 0000000..2343da5
--- /dev/null
+++ b/src/libjpeg-turbo/jdapistd.c
@@ -0,0 +1,277 @@
+/*
+ * jdapistd.c
+ *
+ * Copyright (C) 1994-1996, Thomas G. Lane.
+ * Copyright (C) 2010, D. R. Commander.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains application interface code for the decompression half
+ * of the JPEG library.  These are the "standard" API routines that are
+ * used in the normal full-decompression case.  They are not used by a
+ * transcoding-only application.  Note that if an application links in
+ * jpeg_start_decompress, it will end up linking in the entire decompressor.
+ * We thus must separate this file from jdapimin.c to avoid linking the
+ * whole decompression library into a transcoder.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jpegcomp.h"
+
+
+/* Forward declarations */
+LOCAL(boolean) output_pass_setup JPP((j_decompress_ptr cinfo));
+
+
+/*
+ * Decompression initialization.
+ * jpeg_read_header must be completed before calling this.
+ *
+ * If a multipass operating mode was selected, this will do all but the
+ * last pass, and thus may take a great deal of time.
+ *
+ * Returns FALSE if suspended.  The return value need be inspected only if
+ * a suspending data source is used.
+ */
+
+GLOBAL(boolean)
+jpeg_start_decompress (j_decompress_ptr cinfo)
+{
+  if (cinfo->global_state == DSTATE_READY) {
+    /* First call: initialize master control, select active modules */
+    jinit_master_decompress(cinfo);
+    if (cinfo->buffered_image) {
+      /* No more work here; expecting jpeg_start_output next */
+      cinfo->global_state = DSTATE_BUFIMAGE;
+      return TRUE;
+    }
+    cinfo->global_state = DSTATE_PRELOAD;
+  }
+  if (cinfo->global_state == DSTATE_PRELOAD) {
+    /* If file has multiple scans, absorb them all into the coef buffer */
+    if (cinfo->inputctl->has_multiple_scans) {
+#ifdef D_MULTISCAN_FILES_SUPPORTED
+      for (;;) {
+	int retcode;
+	/* Call progress monitor hook if present */
+	if (cinfo->progress != NULL)
+	  (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
+	/* Absorb some more input */
+	retcode = (*cinfo->inputctl->consume_input) (cinfo);
+	if (retcode == JPEG_SUSPENDED)
+	  return FALSE;
+	if (retcode == JPEG_REACHED_EOI)
+	  break;
+	/* Advance progress counter if appropriate */
+	if (cinfo->progress != NULL &&
+	    (retcode == JPEG_ROW_COMPLETED || retcode == JPEG_REACHED_SOS)) {
+	  if (++cinfo->progress->pass_counter >= cinfo->progress->pass_limit) {
+	    /* jdmaster underestimated number of scans; ratchet up one scan */
+	    cinfo->progress->pass_limit += (long) cinfo->total_iMCU_rows;
+	  }
+	}
+      }
+#else
+      ERREXIT(cinfo, JERR_NOT_COMPILED);
+#endif /* D_MULTISCAN_FILES_SUPPORTED */
+    }
+    cinfo->output_scan_number = cinfo->input_scan_number;
+  } else if (cinfo->global_state != DSTATE_PRESCAN)
+    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
+  /* Perform any dummy output passes, and set up for the final pass */
+  return output_pass_setup(cinfo);
+}
+
+
+/*
+ * Set up for an output pass, and perform any dummy pass(es) needed.
+ * Common subroutine for jpeg_start_decompress and jpeg_start_output.
+ * Entry: global_state = DSTATE_PRESCAN only if previously suspended.
+ * Exit: If done, returns TRUE and sets global_state for proper output mode.
+ *       If suspended, returns FALSE and sets global_state = DSTATE_PRESCAN.
+ */
+
+LOCAL(boolean)
+output_pass_setup (j_decompress_ptr cinfo)
+{
+  if (cinfo->global_state != DSTATE_PRESCAN) {
+    /* First call: do pass setup */
+    (*cinfo->master->prepare_for_output_pass) (cinfo);
+    cinfo->output_scanline = 0;
+    cinfo->global_state = DSTATE_PRESCAN;
+  }
+  /* Loop over any required dummy passes */
+  while (cinfo->master->is_dummy_pass) {
+#ifdef QUANT_2PASS_SUPPORTED
+    /* Crank through the dummy pass */
+    while (cinfo->output_scanline < cinfo->output_height) {
+      JDIMENSION last_scanline;
+      /* Call progress monitor hook if present */
+      if (cinfo->progress != NULL) {
+	cinfo->progress->pass_counter = (long) cinfo->output_scanline;
+	cinfo->progress->pass_limit = (long) cinfo->output_height;
+	(*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
+      }
+      /* Process some data */
+      last_scanline = cinfo->output_scanline;
+      (*cinfo->main->process_data) (cinfo, (JSAMPARRAY) NULL,
+				    &cinfo->output_scanline, (JDIMENSION) 0);
+      if (cinfo->output_scanline == last_scanline)
+	return FALSE;		/* No progress made, must suspend */
+    }
+    /* Finish up dummy pass, and set up for another one */
+    (*cinfo->master->finish_output_pass) (cinfo);
+    (*cinfo->master->prepare_for_output_pass) (cinfo);
+    cinfo->output_scanline = 0;
+#else
+    ERREXIT(cinfo, JERR_NOT_COMPILED);
+#endif /* QUANT_2PASS_SUPPORTED */
+  }
+  /* Ready for application to drive output pass through
+   * jpeg_read_scanlines or jpeg_read_raw_data.
+   */
+  cinfo->global_state = cinfo->raw_data_out ? DSTATE_RAW_OK : DSTATE_SCANNING;
+  return TRUE;
+}
+
+
+/*
+ * Read some scanlines of data from the JPEG decompressor.
+ *
+ * The return value will be the number of lines actually read.
+ * This may be less than the number requested in several cases,
+ * including bottom of image, data source suspension, and operating
+ * modes that emit multiple scanlines at a time.
+ *
+ * Note: we warn about excess calls to jpeg_read_scanlines() since
+ * this likely signals an application programmer error.  However,
+ * an oversize buffer (max_lines > scanlines remaining) is not an error.
+ */
+
+GLOBAL(JDIMENSION)
+jpeg_read_scanlines (j_decompress_ptr cinfo, JSAMPARRAY scanlines,
+		     JDIMENSION max_lines)
+{
+  JDIMENSION row_ctr;
+
+  if (cinfo->global_state != DSTATE_SCANNING)
+    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
+  if (cinfo->output_scanline >= cinfo->output_height) {
+    WARNMS(cinfo, JWRN_TOO_MUCH_DATA);
+    return 0;
+  }
+
+  /* Call progress monitor hook if present */
+  if (cinfo->progress != NULL) {
+    cinfo->progress->pass_counter = (long) cinfo->output_scanline;
+    cinfo->progress->pass_limit = (long) cinfo->output_height;
+    (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
+  }
+
+  /* Process some data */
+  row_ctr = 0;
+  (*cinfo->main->process_data) (cinfo, scanlines, &row_ctr, max_lines);
+  cinfo->output_scanline += row_ctr;
+  return row_ctr;
+}
+
+
+/*
+ * Alternate entry point to read raw data.
+ * Processes exactly one iMCU row per call, unless suspended.
+ */
+
+GLOBAL(JDIMENSION)
+jpeg_read_raw_data (j_decompress_ptr cinfo, JSAMPIMAGE data,
+		    JDIMENSION max_lines)
+{
+  JDIMENSION lines_per_iMCU_row;
+
+  if (cinfo->global_state != DSTATE_RAW_OK)
+    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
+  if (cinfo->output_scanline >= cinfo->output_height) {
+    WARNMS(cinfo, JWRN_TOO_MUCH_DATA);
+    return 0;
+  }
+
+  /* Call progress monitor hook if present */
+  if (cinfo->progress != NULL) {
+    cinfo->progress->pass_counter = (long) cinfo->output_scanline;
+    cinfo->progress->pass_limit = (long) cinfo->output_height;
+    (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
+  }
+
+  /* Verify that at least one iMCU row can be returned. */
+  lines_per_iMCU_row = cinfo->max_v_samp_factor * cinfo->_min_DCT_scaled_size;
+  if (max_lines < lines_per_iMCU_row)
+    ERREXIT(cinfo, JERR_BUFFER_SIZE);
+
+  /* Decompress directly into user's buffer. */
+  if (! (*cinfo->coef->decompress_data) (cinfo, data))
+    return 0;			/* suspension forced, can do nothing more */
+
+  /* OK, we processed one iMCU row. */
+  cinfo->output_scanline += lines_per_iMCU_row;
+  return lines_per_iMCU_row;
+}
+
+
+/* Additional entry points for buffered-image mode. */
+
+#ifdef D_MULTISCAN_FILES_SUPPORTED
+
+/*
+ * Initialize for an output pass in buffered-image mode.
+ */
+
+GLOBAL(boolean)
+jpeg_start_output (j_decompress_ptr cinfo, int scan_number)
+{
+  if (cinfo->global_state != DSTATE_BUFIMAGE &&
+      cinfo->global_state != DSTATE_PRESCAN)
+    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
+  /* Limit scan number to valid range */
+  if (scan_number <= 0)
+    scan_number = 1;
+  if (cinfo->inputctl->eoi_reached &&
+      scan_number > cinfo->input_scan_number)
+    scan_number = cinfo->input_scan_number;
+  cinfo->output_scan_number = scan_number;
+  /* Perform any dummy output passes, and set up for the real pass */
+  return output_pass_setup(cinfo);
+}
+
+
+/*
+ * Finish up after an output pass in buffered-image mode.
+ *
+ * Returns FALSE if suspended.  The return value need be inspected only if
+ * a suspending data source is used.
+ */
+
+GLOBAL(boolean)
+jpeg_finish_output (j_decompress_ptr cinfo)
+{
+  if ((cinfo->global_state == DSTATE_SCANNING ||
+       cinfo->global_state == DSTATE_RAW_OK) && cinfo->buffered_image) {
+    /* Terminate this pass. */
+    /* We do not require the whole pass to have been completed. */
+    (*cinfo->master->finish_output_pass) (cinfo);
+    cinfo->global_state = DSTATE_BUFPOST;
+  } else if (cinfo->global_state != DSTATE_BUFPOST) {
+    /* BUFPOST = repeat call after a suspension, anything else is error */
+    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
+  }
+  /* Read markers looking for SOS or EOI */
+  while (cinfo->input_scan_number <= cinfo->output_scan_number &&
+	 ! cinfo->inputctl->eoi_reached) {
+    if ((*cinfo->inputctl->consume_input) (cinfo) == JPEG_SUSPENDED)
+      return FALSE;		/* Suspend, come back later */
+  }
+  cinfo->global_state = DSTATE_BUFIMAGE;
+  return TRUE;
+}
+
+#endif /* D_MULTISCAN_FILES_SUPPORTED */
diff --git a/src/libjpeg-turbo/jdarith.c b/src/libjpeg-turbo/jdarith.c
new file mode 100644
index 0000000..d556733
--- /dev/null
+++ b/src/libjpeg-turbo/jdarith.c
@@ -0,0 +1,761 @@
+/*
+ * jdarith.c
+ *
+ * Developed 1997-2009 by Guido Vollbeding.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains portable arithmetic entropy decoding routines for JPEG
+ * (implementing the ISO/IEC IS 10918-1 and CCITT Recommendation ITU-T T.81).
+ *
+ * Both sequential and progressive modes are supported in this single module.
+ *
+ * Suspension is not currently supported in this module.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+
+
+/* Expanded entropy decoder object for arithmetic decoding. */
+
+typedef struct {
+  struct jpeg_entropy_decoder pub; /* public fields */
+
+  INT32 c;       /* C register, base of coding interval + input bit buffer */
+  INT32 a;               /* A register, normalized size of coding interval */
+  int ct;     /* bit shift counter, # of bits left in bit buffer part of C */
+                                                         /* init: ct = -16 */
+                                                         /* run: ct = 0..7 */
+                                                         /* error: ct = -1 */
+  int last_dc_val[MAX_COMPS_IN_SCAN]; /* last DC coef for each component */
+  int dc_context[MAX_COMPS_IN_SCAN]; /* context index for DC conditioning */
+
+  unsigned int restarts_to_go;	/* MCUs left in this restart interval */
+
+  /* Pointers to statistics areas (these workspaces have image lifespan) */
+  unsigned char * dc_stats[NUM_ARITH_TBLS];
+  unsigned char * ac_stats[NUM_ARITH_TBLS];
+
+  /* Statistics bin for coding with fixed probability 0.5 */
+  unsigned char fixed_bin[4];
+} arith_entropy_decoder;
+
+typedef arith_entropy_decoder * arith_entropy_ptr;
+
+/* The following two definitions specify the allocation chunk size
+ * for the statistics area.
+ * According to sections F.1.4.4.1.3 and F.1.4.4.2, we need at least
+ * 49 statistics bins for DC, and 245 statistics bins for AC coding.
+ *
+ * We use a compact representation with 1 byte per statistics bin,
+ * thus the numbers directly represent byte sizes.
+ * This 1 byte per statistics bin contains the meaning of the MPS
+ * (more probable symbol) in the highest bit (mask 0x80), and the
+ * index into the probability estimation state machine table
+ * in the lower bits (mask 0x7F).
+ */
+
+#define DC_STAT_BINS 64
+#define AC_STAT_BINS 256
+
+
+LOCAL(int)
+get_byte (j_decompress_ptr cinfo)
+/* Read next input byte; we do not support suspension in this module. */
+{
+  struct jpeg_source_mgr * src = cinfo->src;
+
+  if (src->bytes_in_buffer == 0)
+    if (! (*src->fill_input_buffer) (cinfo))
+      ERREXIT(cinfo, JERR_CANT_SUSPEND);
+  src->bytes_in_buffer--;
+  return GETJOCTET(*src->next_input_byte++);
+}
+
+
+/*
+ * The core arithmetic decoding routine (common in JPEG and JBIG).
+ * This needs to go as fast as possible.
+ * Machine-dependent optimization facilities
+ * are not utilized in this portable implementation.
+ * However, this code should be fairly efficient and
+ * may be a good base for further optimizations anyway.
+ *
+ * Return value is 0 or 1 (binary decision).
+ *
+ * Note: I've changed the handling of the code base & bit
+ * buffer register C compared to other implementations
+ * based on the standards layout & procedures.
+ * While it also contains both the actual base of the
+ * coding interval (16 bits) and the next-bits buffer,
+ * the cut-point between these two parts is floating
+ * (instead of fixed) with the bit shift counter CT.
+ * Thus, we also need only one (variable instead of
+ * fixed size) shift for the LPS/MPS decision, and
+ * we can get away with any renormalization update
+ * of C (except for new data insertion, of course).
+ *
+ * I've also introduced a new scheme for accessing
+ * the probability estimation state machine table,
+ * derived from Markus Kuhn's JBIG implementation.
+ */
+
+LOCAL(int)
+arith_decode (j_decompress_ptr cinfo, unsigned char *st)
+{
+  register arith_entropy_ptr e = (arith_entropy_ptr) cinfo->entropy;
+  register unsigned char nl, nm;
+  register INT32 qe, temp;
+  register int sv, data;
+
+  /* Renormalization & data input per section D.2.6 */
+  while (e->a < 0x8000L) {
+    if (--e->ct < 0) {
+      /* Need to fetch next data byte */
+      if (cinfo->unread_marker)
+	data = 0;		/* stuff zero data */
+      else {
+	data = get_byte(cinfo);	/* read next input byte */
+	if (data == 0xFF) {	/* zero stuff or marker code */
+	  do data = get_byte(cinfo);
+	  while (data == 0xFF);	/* swallow extra 0xFF bytes */
+	  if (data == 0)
+	    data = 0xFF;	/* discard stuffed zero byte */
+	  else {
+	    /* Note: Different from the Huffman decoder, hitting
+	     * a marker while processing the compressed data
+	     * segment is legal in arithmetic coding.
+	     * The convention is to supply zero data
+	     * then until decoding is complete.
+	     */
+	    cinfo->unread_marker = data;
+	    data = 0;
+	  }
+	}
+      }
+      e->c = (e->c << 8) | data; /* insert data into C register */
+      if ((e->ct += 8) < 0)	 /* update bit shift counter */
+	/* Need more initial bytes */
+	if (++e->ct == 0)
+	  /* Got 2 initial bytes -> re-init A and exit loop */
+	  e->a = 0x8000L; /* => e->a = 0x10000L after loop exit */
+    }
+    e->a <<= 1;
+  }
+
+  /* Fetch values from our compact representation of Table D.2:
+   * Qe values and probability estimation state machine
+   */
+  sv = *st;
+  qe = jpeg_aritab[sv & 0x7F];	/* => Qe_Value */
+  nl = qe & 0xFF; qe >>= 8;	/* Next_Index_LPS + Switch_MPS */
+  nm = qe & 0xFF; qe >>= 8;	/* Next_Index_MPS */
+
+  /* Decode & estimation procedures per sections D.2.4 & D.2.5 */
+  temp = e->a - qe;
+  e->a = temp;
+  temp <<= e->ct;
+  if (e->c >= temp) {
+    e->c -= temp;
+    /* Conditional LPS (less probable symbol) exchange */
+    if (e->a < qe) {
+      e->a = qe;
+      *st = (sv & 0x80) ^ nm;	/* Estimate_after_MPS */
+    } else {
+      e->a = qe;
+      *st = (sv & 0x80) ^ nl;	/* Estimate_after_LPS */
+      sv ^= 0x80;		/* Exchange LPS/MPS */
+    }
+  } else if (e->a < 0x8000L) {
+    /* Conditional MPS (more probable symbol) exchange */
+    if (e->a < qe) {
+      *st = (sv & 0x80) ^ nl;	/* Estimate_after_LPS */
+      sv ^= 0x80;		/* Exchange LPS/MPS */
+    } else {
+      *st = (sv & 0x80) ^ nm;	/* Estimate_after_MPS */
+    }
+  }
+
+  return sv >> 7;
+}
+
+
+/*
+ * Check for a restart marker & resynchronize decoder.
+ */
+
+LOCAL(void)
+process_restart (j_decompress_ptr cinfo)
+{
+  arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
+  int ci;
+  jpeg_component_info * compptr;
+
+  /* Advance past the RSTn marker */
+  if (! (*cinfo->marker->read_restart_marker) (cinfo))
+    ERREXIT(cinfo, JERR_CANT_SUSPEND);
+
+  /* Re-initialize statistics areas */
+  for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
+    compptr = cinfo->cur_comp_info[ci];
+    if (! cinfo->progressive_mode || (cinfo->Ss == 0 && cinfo->Ah == 0)) {
+      MEMZERO(entropy->dc_stats[compptr->dc_tbl_no], DC_STAT_BINS);
+      /* Reset DC predictions to 0 */
+      entropy->last_dc_val[ci] = 0;
+      entropy->dc_context[ci] = 0;
+    }
+    if (! cinfo->progressive_mode || cinfo->Ss) {
+      MEMZERO(entropy->ac_stats[compptr->ac_tbl_no], AC_STAT_BINS);
+    }
+  }
+
+  /* Reset arithmetic decoding variables */
+  entropy->c = 0;
+  entropy->a = 0;
+  entropy->ct = -16;	/* force reading 2 initial bytes to fill C */
+
+  /* Reset restart counter */
+  entropy->restarts_to_go = cinfo->restart_interval;
+}
+
+
+/*
+ * Arithmetic MCU decoding.
+ * Each of these routines decodes and returns one MCU's worth of
+ * arithmetic-compressed coefficients.
+ * The coefficients are reordered from zigzag order into natural array order,
+ * but are not dequantized.
+ *
+ * The i'th block of the MCU is stored into the block pointed to by
+ * MCU_data[i].  WE ASSUME THIS AREA IS INITIALLY ZEROED BY THE CALLER.
+ */
+
+/*
+ * MCU decoding for DC initial scan (either spectral selection,
+ * or first pass of successive approximation).
+ */
+
+METHODDEF(boolean)
+decode_mcu_DC_first (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
+{
+  arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
+  JBLOCKROW block;
+  unsigned char *st;
+  int blkn, ci, tbl, sign;
+  int v, m;
+
+  /* Process restart marker if needed */
+  if (cinfo->restart_interval) {
+    if (entropy->restarts_to_go == 0)
+      process_restart(cinfo);
+    entropy->restarts_to_go--;
+  }
+
+  if (entropy->ct == -1) return TRUE;	/* if error do nothing */
+
+  /* Outer loop handles each block in the MCU */
+
+  for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
+    block = MCU_data[blkn];
+    ci = cinfo->MCU_membership[blkn];
+    tbl = cinfo->cur_comp_info[ci]->dc_tbl_no;
+
+    /* Sections F.2.4.1 & F.1.4.4.1: Decoding of DC coefficients */
+
+    /* Table F.4: Point to statistics bin S0 for DC coefficient coding */
+    st = entropy->dc_stats[tbl] + entropy->dc_context[ci];
+
+    /* Figure F.19: Decode_DC_DIFF */
+    if (arith_decode(cinfo, st) == 0)
+      entropy->dc_context[ci] = 0;
+    else {
+      /* Figure F.21: Decoding nonzero value v */
+      /* Figure F.22: Decoding the sign of v */
+      sign = arith_decode(cinfo, st + 1);
+      st += 2; st += sign;
+      /* Figure F.23: Decoding the magnitude category of v */
+      if ((m = arith_decode(cinfo, st)) != 0) {
+	st = entropy->dc_stats[tbl] + 20;	/* Table F.4: X1 = 20 */
+	while (arith_decode(cinfo, st)) {
+	  if ((m <<= 1) == 0x8000) {
+	    WARNMS(cinfo, JWRN_ARITH_BAD_CODE);
+	    entropy->ct = -1;			/* magnitude overflow */
+	    return TRUE;
+	  }
+	  st += 1;
+	}
+      }
+      /* Section F.1.4.4.1.2: Establish dc_context conditioning category */
+      if (m < (int) ((1L << cinfo->arith_dc_L[tbl]) >> 1))
+	entropy->dc_context[ci] = 0;		   /* zero diff category */
+      else if (m > (int) ((1L << cinfo->arith_dc_U[tbl]) >> 1))
+	entropy->dc_context[ci] = 12 + (sign * 4); /* large diff category */
+      else
+	entropy->dc_context[ci] = 4 + (sign * 4);  /* small diff category */
+      v = m;
+      /* Figure F.24: Decoding the magnitude bit pattern of v */
+      st += 14;
+      while (m >>= 1)
+	if (arith_decode(cinfo, st)) v |= m;
+      v += 1; if (sign) v = -v;
+      entropy->last_dc_val[ci] += v;
+    }
+
+    /* Scale and output the DC coefficient (assumes jpeg_natural_order[0]=0) */
+    (*block)[0] = (JCOEF) (entropy->last_dc_val[ci] << cinfo->Al);
+  }
+
+  return TRUE;
+}
+
+
+/*
+ * MCU decoding for AC initial scan (either spectral selection,
+ * or first pass of successive approximation).
+ */
+
+METHODDEF(boolean)
+decode_mcu_AC_first (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
+{
+  arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
+  JBLOCKROW block;
+  unsigned char *st;
+  int tbl, sign, k;
+  int v, m;
+
+  /* Process restart marker if needed */
+  if (cinfo->restart_interval) {
+    if (entropy->restarts_to_go == 0)
+      process_restart(cinfo);
+    entropy->restarts_to_go--;
+  }
+
+  if (entropy->ct == -1) return TRUE;	/* if error do nothing */
+
+  /* There is always only one block per MCU */
+  block = MCU_data[0];
+  tbl = cinfo->cur_comp_info[0]->ac_tbl_no;
+
+  /* Sections F.2.4.2 & F.1.4.4.2: Decoding of AC coefficients */
+
+  /* Figure F.20: Decode_AC_coefficients */
+  for (k = cinfo->Ss; k <= cinfo->Se; k++) {
+    st = entropy->ac_stats[tbl] + 3 * (k - 1);
+    if (arith_decode(cinfo, st)) break;		/* EOB flag */
+    while (arith_decode(cinfo, st + 1) == 0) {
+      st += 3; k++;
+      if (k > cinfo->Se) {
+	WARNMS(cinfo, JWRN_ARITH_BAD_CODE);
+	entropy->ct = -1;			/* spectral overflow */
+	return TRUE;
+      }
+    }
+    /* Figure F.21: Decoding nonzero value v */
+    /* Figure F.22: Decoding the sign of v */
+    sign = arith_decode(cinfo, entropy->fixed_bin);
+    st += 2;
+    /* Figure F.23: Decoding the magnitude category of v */
+    if ((m = arith_decode(cinfo, st)) != 0) {
+      if (arith_decode(cinfo, st)) {
+	m <<= 1;
+	st = entropy->ac_stats[tbl] +
+	     (k <= cinfo->arith_ac_K[tbl] ? 189 : 217);
+	while (arith_decode(cinfo, st)) {
+	  if ((m <<= 1) == 0x8000) {
+	    WARNMS(cinfo, JWRN_ARITH_BAD_CODE);
+	    entropy->ct = -1;			/* magnitude overflow */
+	    return TRUE;
+	  }
+	  st += 1;
+	}
+      }
+    }
+    v = m;
+    /* Figure F.24: Decoding the magnitude bit pattern of v */
+    st += 14;
+    while (m >>= 1)
+      if (arith_decode(cinfo, st)) v |= m;
+    v += 1; if (sign) v = -v;
+    /* Scale and output coefficient in natural (dezigzagged) order */
+    (*block)[jpeg_natural_order[k]] = (JCOEF) (v << cinfo->Al);
+  }
+
+  return TRUE;
+}
+
+
+/*
+ * MCU decoding for DC successive approximation refinement scan.
+ */
+
+METHODDEF(boolean)
+decode_mcu_DC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
+{
+  arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
+  unsigned char *st;
+  int p1, blkn;
+
+  /* Process restart marker if needed */
+  if (cinfo->restart_interval) {
+    if (entropy->restarts_to_go == 0)
+      process_restart(cinfo);
+    entropy->restarts_to_go--;
+  }
+
+  st = entropy->fixed_bin;	/* use fixed probability estimation */
+  p1 = 1 << cinfo->Al;		/* 1 in the bit position being coded */
+
+  /* Outer loop handles each block in the MCU */
+
+  for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
+    /* Encoded data is simply the next bit of the two's-complement DC value */
+    if (arith_decode(cinfo, st))
+      MCU_data[blkn][0][0] |= p1;
+  }
+
+  return TRUE;
+}
+
+
+/*
+ * MCU decoding for AC successive approximation refinement scan.
+ */
+
+METHODDEF(boolean)
+decode_mcu_AC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
+{
+  arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
+  JBLOCKROW block;
+  JCOEFPTR thiscoef;
+  unsigned char *st;
+  int tbl, k, kex;
+  int p1, m1;
+
+  /* Process restart marker if needed */
+  if (cinfo->restart_interval) {
+    if (entropy->restarts_to_go == 0)
+      process_restart(cinfo);
+    entropy->restarts_to_go--;
+  }
+
+  if (entropy->ct == -1) return TRUE;	/* if error do nothing */
+
+  /* There is always only one block per MCU */
+  block = MCU_data[0];
+  tbl = cinfo->cur_comp_info[0]->ac_tbl_no;
+
+  p1 = 1 << cinfo->Al;		/* 1 in the bit position being coded */
+  m1 = (-1) << cinfo->Al;	/* -1 in the bit position being coded */
+
+  /* Establish EOBx (previous stage end-of-block) index */
+  for (kex = cinfo->Se; kex > 0; kex--)
+    if ((*block)[jpeg_natural_order[kex]]) break;
+
+  for (k = cinfo->Ss; k <= cinfo->Se; k++) {
+    st = entropy->ac_stats[tbl] + 3 * (k - 1);
+    if (k > kex)
+      if (arith_decode(cinfo, st)) break;	/* EOB flag */
+    for (;;) {
+      thiscoef = *block + jpeg_natural_order[k];
+      if (*thiscoef) {				/* previously nonzero coef */
+	if (arith_decode(cinfo, st + 2)) {
+	  if (*thiscoef < 0)
+	    *thiscoef += m1;
+	  else
+	    *thiscoef += p1;
+	}
+	break;
+      }
+      if (arith_decode(cinfo, st + 1)) {	/* newly nonzero coef */
+	if (arith_decode(cinfo, entropy->fixed_bin))
+	  *thiscoef = m1;
+	else
+	  *thiscoef = p1;
+	break;
+      }
+      st += 3; k++;
+      if (k > cinfo->Se) {
+	WARNMS(cinfo, JWRN_ARITH_BAD_CODE);
+	entropy->ct = -1;			/* spectral overflow */
+	return TRUE;
+      }
+    }
+  }
+
+  return TRUE;
+}
+
+
+/*
+ * Decode one MCU's worth of arithmetic-compressed coefficients.
+ */
+
+METHODDEF(boolean)
+decode_mcu (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
+{
+  arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
+  jpeg_component_info * compptr;
+  JBLOCKROW block;
+  unsigned char *st;
+  int blkn, ci, tbl, sign, k;
+  int v, m;
+
+  /* Process restart marker if needed */
+  if (cinfo->restart_interval) {
+    if (entropy->restarts_to_go == 0)
+      process_restart(cinfo);
+    entropy->restarts_to_go--;
+  }
+
+  if (entropy->ct == -1) return TRUE;	/* if error do nothing */
+
+  /* Outer loop handles each block in the MCU */
+
+  for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
+    block = MCU_data[blkn];
+    ci = cinfo->MCU_membership[blkn];
+    compptr = cinfo->cur_comp_info[ci];
+
+    /* Sections F.2.4.1 & F.1.4.4.1: Decoding of DC coefficients */
+
+    tbl = compptr->dc_tbl_no;
+
+    /* Table F.4: Point to statistics bin S0 for DC coefficient coding */
+    st = entropy->dc_stats[tbl] + entropy->dc_context[ci];
+
+    /* Figure F.19: Decode_DC_DIFF */
+    if (arith_decode(cinfo, st) == 0)
+      entropy->dc_context[ci] = 0;
+    else {
+      /* Figure F.21: Decoding nonzero value v */
+      /* Figure F.22: Decoding the sign of v */
+      sign = arith_decode(cinfo, st + 1);
+      st += 2; st += sign;
+      /* Figure F.23: Decoding the magnitude category of v */
+      if ((m = arith_decode(cinfo, st)) != 0) {
+	st = entropy->dc_stats[tbl] + 20;	/* Table F.4: X1 = 20 */
+	while (arith_decode(cinfo, st)) {
+	  if ((m <<= 1) == 0x8000) {
+	    WARNMS(cinfo, JWRN_ARITH_BAD_CODE);
+	    entropy->ct = -1;			/* magnitude overflow */
+	    return TRUE;
+	  }
+	  st += 1;
+	}
+      }
+      /* Section F.1.4.4.1.2: Establish dc_context conditioning category */
+      if (m < (int) ((1L << cinfo->arith_dc_L[tbl]) >> 1))
+	entropy->dc_context[ci] = 0;		   /* zero diff category */
+      else if (m > (int) ((1L << cinfo->arith_dc_U[tbl]) >> 1))
+	entropy->dc_context[ci] = 12 + (sign * 4); /* large diff category */
+      else
+	entropy->dc_context[ci] = 4 + (sign * 4);  /* small diff category */
+      v = m;
+      /* Figure F.24: Decoding the magnitude bit pattern of v */
+      st += 14;
+      while (m >>= 1)
+	if (arith_decode(cinfo, st)) v |= m;
+      v += 1; if (sign) v = -v;
+      entropy->last_dc_val[ci] += v;
+    }
+
+    (*block)[0] = (JCOEF) entropy->last_dc_val[ci];
+
+    /* Sections F.2.4.2 & F.1.4.4.2: Decoding of AC coefficients */
+
+    tbl = compptr->ac_tbl_no;
+
+    /* Figure F.20: Decode_AC_coefficients */
+    for (k = 1; k <= DCTSIZE2 - 1; k++) {
+      st = entropy->ac_stats[tbl] + 3 * (k - 1);
+      if (arith_decode(cinfo, st)) break;	/* EOB flag */
+      while (arith_decode(cinfo, st + 1) == 0) {
+	st += 3; k++;
+	if (k > DCTSIZE2 - 1) {
+	  WARNMS(cinfo, JWRN_ARITH_BAD_CODE);
+	  entropy->ct = -1;			/* spectral overflow */
+	  return TRUE;
+	}
+      }
+      /* Figure F.21: Decoding nonzero value v */
+      /* Figure F.22: Decoding the sign of v */
+      sign = arith_decode(cinfo, entropy->fixed_bin);
+      st += 2;
+      /* Figure F.23: Decoding the magnitude category of v */
+      if ((m = arith_decode(cinfo, st)) != 0) {
+	if (arith_decode(cinfo, st)) {
+	  m <<= 1;
+	  st = entropy->ac_stats[tbl] +
+	       (k <= cinfo->arith_ac_K[tbl] ? 189 : 217);
+	  while (arith_decode(cinfo, st)) {
+	    if ((m <<= 1) == 0x8000) {
+	      WARNMS(cinfo, JWRN_ARITH_BAD_CODE);
+	      entropy->ct = -1;			/* magnitude overflow */
+	      return TRUE;
+	    }
+	    st += 1;
+	  }
+	}
+      }
+      v = m;
+      /* Figure F.24: Decoding the magnitude bit pattern of v */
+      st += 14;
+      while (m >>= 1)
+	if (arith_decode(cinfo, st)) v |= m;
+      v += 1; if (sign) v = -v;
+      (*block)[jpeg_natural_order[k]] = (JCOEF) v;
+    }
+  }
+
+  return TRUE;
+}
+
+
+/*
+ * Initialize for an arithmetic-compressed scan.
+ */
+
+METHODDEF(void)
+start_pass (j_decompress_ptr cinfo)
+{
+  arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
+  int ci, tbl;
+  jpeg_component_info * compptr;
+
+  if (cinfo->progressive_mode) {
+    /* Validate progressive scan parameters */
+    if (cinfo->Ss == 0) {
+      if (cinfo->Se != 0)
+	goto bad;
+    } else {
+      /* need not check Ss/Se < 0 since they came from unsigned bytes */
+      if (cinfo->Se < cinfo->Ss || cinfo->Se > DCTSIZE2 - 1)
+	goto bad;
+      /* AC scans may have only one component */
+      if (cinfo->comps_in_scan != 1)
+	goto bad;
+    }
+    if (cinfo->Ah != 0) {
+      /* Successive approximation refinement scan: must have Al = Ah-1. */
+      if (cinfo->Ah-1 != cinfo->Al)
+	goto bad;
+    }
+    if (cinfo->Al > 13) {	/* need not check for < 0 */
+      bad:
+      ERREXIT4(cinfo, JERR_BAD_PROGRESSION,
+	       cinfo->Ss, cinfo->Se, cinfo->Ah, cinfo->Al);
+    }
+    /* Update progression status, and verify that scan order is legal.
+     * Note that inter-scan inconsistencies are treated as warnings
+     * not fatal errors ... not clear if this is right way to behave.
+     */
+    for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
+      int coefi, cindex = cinfo->cur_comp_info[ci]->component_index;
+      int *coef_bit_ptr = & cinfo->coef_bits[cindex][0];
+      if (cinfo->Ss && coef_bit_ptr[0] < 0) /* AC without prior DC scan */
+	WARNMS2(cinfo, JWRN_BOGUS_PROGRESSION, cindex, 0);
+      for (coefi = cinfo->Ss; coefi <= cinfo->Se; coefi++) {
+	int expected = (coef_bit_ptr[coefi] < 0) ? 0 : coef_bit_ptr[coefi];
+	if (cinfo->Ah != expected)
+	  WARNMS2(cinfo, JWRN_BOGUS_PROGRESSION, cindex, coefi);
+	coef_bit_ptr[coefi] = cinfo->Al;
+      }
+    }
+    /* Select MCU decoding routine */
+    if (cinfo->Ah == 0) {
+      if (cinfo->Ss == 0)
+	entropy->pub.decode_mcu = decode_mcu_DC_first;
+      else
+	entropy->pub.decode_mcu = decode_mcu_AC_first;
+    } else {
+      if (cinfo->Ss == 0)
+	entropy->pub.decode_mcu = decode_mcu_DC_refine;
+      else
+	entropy->pub.decode_mcu = decode_mcu_AC_refine;
+    }
+  } else {
+    /* Check that the scan parameters Ss, Se, Ah/Al are OK for sequential JPEG.
+     * This ought to be an error condition, but we make it a warning.
+     */
+    if (cinfo->Ss != 0 || cinfo->Ah != 0 || cinfo->Al != 0 ||
+	(cinfo->Se < DCTSIZE2 && cinfo->Se != DCTSIZE2 - 1))
+      WARNMS(cinfo, JWRN_NOT_SEQUENTIAL);
+    /* Select MCU decoding routine */
+    entropy->pub.decode_mcu = decode_mcu;
+  }
+
+  /* Allocate & initialize requested statistics areas */
+  for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
+    compptr = cinfo->cur_comp_info[ci];
+    if (! cinfo->progressive_mode || (cinfo->Ss == 0 && cinfo->Ah == 0)) {
+      tbl = compptr->dc_tbl_no;
+      if (tbl < 0 || tbl >= NUM_ARITH_TBLS)
+	ERREXIT1(cinfo, JERR_NO_ARITH_TABLE, tbl);
+      if (entropy->dc_stats[tbl] == NULL)
+	entropy->dc_stats[tbl] = (unsigned char *) (*cinfo->mem->alloc_small)
+	  ((j_common_ptr) cinfo, JPOOL_IMAGE, DC_STAT_BINS);
+      MEMZERO(entropy->dc_stats[tbl], DC_STAT_BINS);
+      /* Initialize DC predictions to 0 */
+      entropy->last_dc_val[ci] = 0;
+      entropy->dc_context[ci] = 0;
+    }
+    if (! cinfo->progressive_mode || cinfo->Ss) {
+      tbl = compptr->ac_tbl_no;
+      if (tbl < 0 || tbl >= NUM_ARITH_TBLS)
+	ERREXIT1(cinfo, JERR_NO_ARITH_TABLE, tbl);
+      if (entropy->ac_stats[tbl] == NULL)
+	entropy->ac_stats[tbl] = (unsigned char *) (*cinfo->mem->alloc_small)
+	  ((j_common_ptr) cinfo, JPOOL_IMAGE, AC_STAT_BINS);
+      MEMZERO(entropy->ac_stats[tbl], AC_STAT_BINS);
+    }
+  }
+
+  /* Initialize arithmetic decoding variables */
+  entropy->c = 0;
+  entropy->a = 0;
+  entropy->ct = -16;	/* force reading 2 initial bytes to fill C */
+
+  /* Initialize restart counter */
+  entropy->restarts_to_go = cinfo->restart_interval;
+}
+
+
+/*
+ * Module initialization routine for arithmetic entropy decoding.
+ */
+
+GLOBAL(void)
+jinit_arith_decoder (j_decompress_ptr cinfo)
+{
+  arith_entropy_ptr entropy;
+  int i;
+
+  entropy = (arith_entropy_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				SIZEOF(arith_entropy_decoder));
+  cinfo->entropy = (struct jpeg_entropy_decoder *) entropy;
+  entropy->pub.start_pass = start_pass;
+
+  /* Mark tables unallocated */
+  for (i = 0; i < NUM_ARITH_TBLS; i++) {
+    entropy->dc_stats[i] = NULL;
+    entropy->ac_stats[i] = NULL;
+  }
+
+  /* Initialize index for fixed probability estimation */
+  entropy->fixed_bin[0] = 113;
+
+  if (cinfo->progressive_mode) {
+    /* Create progression status table */
+    int *coef_bit_ptr, ci;
+    cinfo->coef_bits = (int (*)[DCTSIZE2])
+      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				  cinfo->num_components*DCTSIZE2*SIZEOF(int));
+    coef_bit_ptr = & cinfo->coef_bits[0][0];
+    for (ci = 0; ci < cinfo->num_components; ci++) 
+      for (i = 0; i < DCTSIZE2; i++)
+	*coef_bit_ptr++ = -1;
+  }
+}
diff --git a/src/libjpeg-turbo/jdatadst-tj.c b/src/libjpeg-turbo/jdatadst-tj.c
new file mode 100644
index 0000000..cb674dc
--- /dev/null
+++ b/src/libjpeg-turbo/jdatadst-tj.c
@@ -0,0 +1,188 @@
+/*
+ * jdatadst.c
+ *
+ * Copyright (C) 1994-1996, Thomas G. Lane.
+ * Modified 2009 by Guido Vollbeding.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains compression data destination routines for the case of
+ * emitting JPEG data to memory or to a file (or any stdio stream).
+ * While these routines are sufficient for most applications,
+ * some will want to use a different destination manager.
+ * IMPORTANT: we assume that fwrite() will correctly transcribe an array of
+ * JOCTETs into 8-bit-wide elements on external storage.  If char is wider
+ * than 8 bits on your machine, you may need to do some tweaking.
+ */
+
+/* this is not a core library module, so it doesn't define JPEG_INTERNALS */
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jerror.h"
+
+#ifndef HAVE_STDLIB_H		/* <stdlib.h> should declare malloc(),free() */
+extern void * malloc JPP((size_t size));
+extern void free JPP((void *ptr));
+#endif
+
+
+#define OUTPUT_BUF_SIZE  4096	/* choose an efficiently fwrite'able size */
+
+
+/* Expanded data destination object for memory output */
+
+typedef struct {
+  struct jpeg_destination_mgr pub; /* public fields */
+
+  unsigned char ** outbuffer;	/* target buffer */
+  unsigned long * outsize;
+  unsigned char * newbuffer;	/* newly allocated buffer */
+  JOCTET * buffer;		/* start of buffer */
+  size_t bufsize;
+  boolean alloc;
+} my_mem_destination_mgr;
+
+typedef my_mem_destination_mgr * my_mem_dest_ptr;
+
+
+/*
+ * Initialize destination --- called by jpeg_start_compress
+ * before any data is actually written.
+ */
+
+METHODDEF(void)
+init_mem_destination (j_compress_ptr cinfo)
+{
+  /* no work necessary here */
+}
+
+
+/*
+ * Empty the output buffer --- called whenever buffer fills up.
+ *
+ * In typical applications, this should write the entire output buffer
+ * (ignoring the current state of next_output_byte & free_in_buffer),
+ * reset the pointer & count to the start of the buffer, and return TRUE
+ * indicating that the buffer has been dumped.
+ *
+ * In applications that need to be able to suspend compression due to output
+ * overrun, a FALSE return indicates that the buffer cannot be emptied now.
+ * In this situation, the compressor will return to its caller (possibly with
+ * an indication that it has not accepted all the supplied scanlines).  The
+ * application should resume compression after it has made more room in the
+ * output buffer.  Note that there are substantial restrictions on the use of
+ * suspension --- see the documentation.
+ *
+ * When suspending, the compressor will back up to a convenient restart point
+ * (typically the start of the current MCU). next_output_byte & free_in_buffer
+ * indicate where the restart point will be if the current call returns FALSE.
+ * Data beyond this point will be regenerated after resumption, so do not
+ * write it out when emptying the buffer externally.
+ */
+
+METHODDEF(boolean)
+empty_mem_output_buffer (j_compress_ptr cinfo)
+{
+  size_t nextsize;
+  JOCTET * nextbuffer;
+  my_mem_dest_ptr dest = (my_mem_dest_ptr) cinfo->dest;
+
+  if (!dest->alloc) ERREXIT(cinfo, JERR_BUFFER_SIZE);
+
+  /* Try to allocate new buffer with double size */
+  nextsize = dest->bufsize * 2;
+  nextbuffer = malloc(nextsize);
+
+  if (nextbuffer == NULL)
+    ERREXIT1(cinfo, JERR_OUT_OF_MEMORY, 10);
+
+  MEMCOPY(nextbuffer, dest->buffer, dest->bufsize);
+
+  if (dest->newbuffer != NULL)
+    free(dest->newbuffer);
+
+  dest->newbuffer = nextbuffer;
+
+  dest->pub.next_output_byte = nextbuffer + dest->bufsize;
+  dest->pub.free_in_buffer = dest->bufsize;
+
+  dest->buffer = nextbuffer;
+  dest->bufsize = nextsize;
+
+  return TRUE;
+}
+
+
+/*
+ * Terminate destination --- called by jpeg_finish_compress
+ * after all data has been written.  Usually needs to flush buffer.
+ *
+ * NB: *not* called by jpeg_abort or jpeg_destroy; surrounding
+ * application must deal with any cleanup that should happen even
+ * for error exit.
+ */
+
+METHODDEF(void)
+term_mem_destination (j_compress_ptr cinfo)
+{
+  my_mem_dest_ptr dest = (my_mem_dest_ptr) cinfo->dest;
+
+  if(dest->alloc) *dest->outbuffer = dest->buffer;
+  *dest->outsize = (unsigned long)(dest->bufsize - dest->pub.free_in_buffer);
+}
+
+
+/*
+ * Prepare for output to a memory buffer.
+ * The caller may supply an own initial buffer with appropriate size.
+ * Otherwise, or when the actual data output exceeds the given size,
+ * the library adapts the buffer size as necessary.
+ * The standard library functions malloc/free are used for allocating
+ * larger memory, so the buffer is available to the application after
+ * finishing compression, and then the application is responsible for
+ * freeing the requested memory.
+ */
+
+GLOBAL(void)
+jpeg_mem_dest_tj (j_compress_ptr cinfo,
+	       unsigned char ** outbuffer, unsigned long * outsize,
+	       boolean alloc)
+{
+  my_mem_dest_ptr dest;
+
+  if (outbuffer == NULL || outsize == NULL)	/* sanity check */
+    ERREXIT(cinfo, JERR_BUFFER_SIZE);
+
+  /* The destination object is made permanent so that multiple JPEG images
+   * can be written to the same buffer without re-executing jpeg_mem_dest.
+   */
+  if (cinfo->dest == NULL) {	/* first time for this JPEG object? */
+    cinfo->dest = (struct jpeg_destination_mgr *)
+      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
+				  SIZEOF(my_mem_destination_mgr));
+    dest = (my_mem_dest_ptr) cinfo->dest;
+    dest->newbuffer = NULL;
+  }
+
+  dest = (my_mem_dest_ptr) cinfo->dest;
+  dest->pub.init_destination = init_mem_destination;
+  dest->pub.empty_output_buffer = empty_mem_output_buffer;
+  dest->pub.term_destination = term_mem_destination;
+  dest->outbuffer = outbuffer;
+  dest->outsize = outsize;
+  dest->alloc = alloc;
+
+  if (*outbuffer == NULL || *outsize == 0) {
+    if (alloc) {
+      /* Allocate initial buffer */
+      dest->newbuffer = *outbuffer = malloc(OUTPUT_BUF_SIZE);
+      if (dest->newbuffer == NULL)
+        ERREXIT1(cinfo, JERR_OUT_OF_MEMORY, 10);
+      *outsize = OUTPUT_BUF_SIZE;
+    }
+    else ERREXIT(cinfo, JERR_BUFFER_SIZE);
+  }
+
+  dest->pub.next_output_byte = dest->buffer = *outbuffer;
+  dest->pub.free_in_buffer = dest->bufsize = *outsize;
+}
diff --git a/src/libjpeg-turbo/jdatasrc-tj.c b/src/libjpeg-turbo/jdatasrc-tj.c
new file mode 100644
index 0000000..d860a02
--- /dev/null
+++ b/src/libjpeg-turbo/jdatasrc-tj.c
@@ -0,0 +1,182 @@
+/*
+ * jdatasrc.c
+ *
+ * Copyright (C) 1994-1996, Thomas G. Lane.
+ * Modified 2009-2010 by Guido Vollbeding.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains decompression data source routines for the case of
+ * reading JPEG data from memory or from a file (or any stdio stream).
+ * While these routines are sufficient for most applications,
+ * some will want to use a different source manager.
+ * IMPORTANT: we assume that fread() will correctly transcribe an array of
+ * JOCTETs from 8-bit-wide elements on external storage.  If char is wider
+ * than 8 bits on your machine, you may need to do some tweaking.
+ */
+
+/* this is not a core library module, so it doesn't define JPEG_INTERNALS */
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jerror.h"
+
+
+/*
+ * Initialize source --- called by jpeg_read_header
+ * before any data is actually read.
+ */
+
+METHODDEF(void)
+init_mem_source (j_decompress_ptr cinfo)
+{
+  /* no work necessary here */
+}
+
+
+/*
+ * Fill the input buffer --- called whenever buffer is emptied.
+ *
+ * In typical applications, this should read fresh data into the buffer
+ * (ignoring the current state of next_input_byte & bytes_in_buffer),
+ * reset the pointer & count to the start of the buffer, and return TRUE
+ * indicating that the buffer has been reloaded.  It is not necessary to
+ * fill the buffer entirely, only to obtain at least one more byte.
+ *
+ * There is no such thing as an EOF return.  If the end of the file has been
+ * reached, the routine has a choice of ERREXIT() or inserting fake data into
+ * the buffer.  In most cases, generating a warning message and inserting a
+ * fake EOI marker is the best course of action --- this will allow the
+ * decompressor to output however much of the image is there.  However,
+ * the resulting error message is misleading if the real problem is an empty
+ * input file, so we handle that case specially.
+ *
+ * In applications that need to be able to suspend compression due to input
+ * not being available yet, a FALSE return indicates that no more data can be
+ * obtained right now, but more may be forthcoming later.  In this situation,
+ * the decompressor will return to its caller (with an indication of the
+ * number of scanlines it has read, if any).  The application should resume
+ * decompression after it has loaded more data into the input buffer.  Note
+ * that there are substantial restrictions on the use of suspension --- see
+ * the documentation.
+ *
+ * When suspending, the decompressor will back up to a convenient restart point
+ * (typically the start of the current MCU). next_input_byte & bytes_in_buffer
+ * indicate where the restart point will be if the current call returns FALSE.
+ * Data beyond this point must be rescanned after resumption, so move it to
+ * the front of the buffer rather than discarding it.
+ */
+
+METHODDEF(boolean)
+fill_mem_input_buffer (j_decompress_ptr cinfo)
+{
+  static JOCTET mybuffer[4];
+
+  /* The whole JPEG data is expected to reside in the supplied memory
+   * buffer, so any request for more data beyond the given buffer size
+   * is treated as an error.
+   */
+  WARNMS(cinfo, JWRN_JPEG_EOF);
+  /* Insert a fake EOI marker */
+  mybuffer[0] = (JOCTET) 0xFF;
+  mybuffer[1] = (JOCTET) JPEG_EOI;
+
+  cinfo->src->next_input_byte = mybuffer;
+  cinfo->src->bytes_in_buffer = 2;
+
+  return TRUE;
+}
+
+
+/*
+ * Skip data --- used to skip over a potentially large amount of
+ * uninteresting data (such as an APPn marker).
+ *
+ * Writers of suspendable-input applications must note that skip_input_data
+ * is not granted the right to give a suspension return.  If the skip extends
+ * beyond the data currently in the buffer, the buffer can be marked empty so
+ * that the next read will cause a fill_input_buffer call that can suspend.
+ * Arranging for additional bytes to be discarded before reloading the input
+ * buffer is the application writer's problem.
+ */
+
+METHODDEF(void)
+skip_input_data (j_decompress_ptr cinfo, long num_bytes)
+{
+  struct jpeg_source_mgr * src = cinfo->src;
+
+  /* Just a dumb implementation for now.  Could use fseek() except
+   * it doesn't work on pipes.  Not clear that being smart is worth
+   * any trouble anyway --- large skips are infrequent.
+   */
+  if (num_bytes > 0) {
+    while (num_bytes > (long) src->bytes_in_buffer) {
+      num_bytes -= (long) src->bytes_in_buffer;
+      (void) (*src->fill_input_buffer) (cinfo);
+      /* note we assume that fill_input_buffer will never return FALSE,
+       * so suspension need not be handled.
+       */
+    }
+    src->next_input_byte += (size_t) num_bytes;
+    src->bytes_in_buffer -= (size_t) num_bytes;
+  }
+}
+
+
+/*
+ * An additional method that can be provided by data source modules is the
+ * resync_to_restart method for error recovery in the presence of RST markers.
+ * For the moment, this source module just uses the default resync method
+ * provided by the JPEG library.  That method assumes that no backtracking
+ * is possible.
+ */
+
+
+/*
+ * Terminate source --- called by jpeg_finish_decompress
+ * after all data has been read.  Often a no-op.
+ *
+ * NB: *not* called by jpeg_abort or jpeg_destroy; surrounding
+ * application must deal with any cleanup that should happen even
+ * for error exit.
+ */
+
+METHODDEF(void)
+term_source (j_decompress_ptr cinfo)
+{
+  /* no work necessary here */
+}
+
+
+/*
+ * Prepare for input from a supplied memory buffer.
+ * The buffer must contain the whole JPEG data.
+ */
+
+GLOBAL(void)
+jpeg_mem_src_tj (j_decompress_ptr cinfo,
+	      unsigned char * inbuffer, unsigned long insize)
+{
+  struct jpeg_source_mgr * src;
+
+  if (inbuffer == NULL || insize == 0)	/* Treat empty input as fatal error */
+    ERREXIT(cinfo, JERR_INPUT_EMPTY);
+
+  /* The source object is made permanent so that a series of JPEG images
+   * can be read from the same buffer by calling jpeg_mem_src only before
+   * the first one.
+   */
+  if (cinfo->src == NULL) {	/* first time for this JPEG object? */
+    cinfo->src = (struct jpeg_source_mgr *)
+      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
+				  SIZEOF(struct jpeg_source_mgr));
+  }
+
+  src = cinfo->src;
+  src->init_source = init_mem_source;
+  src->fill_input_buffer = fill_mem_input_buffer;
+  src->skip_input_data = skip_input_data;
+  src->resync_to_restart = jpeg_resync_to_restart; /* use default method */
+  src->term_source = term_source;
+  src->bytes_in_buffer = (size_t) insize;
+  src->next_input_byte = (JOCTET *) inbuffer;
+}
diff --git a/src/libjpeg-turbo/jdcoefct.c b/src/libjpeg-turbo/jdcoefct.c
new file mode 100644
index 0000000..48a9fc6
--- /dev/null
+++ b/src/libjpeg-turbo/jdcoefct.c
@@ -0,0 +1,749 @@
+/*
+ * jdcoefct.c
+ *
+ * Copyright (C) 1994-1997, Thomas G. Lane.
+ * Copyright (C) 2010, D. R. Commander.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains the coefficient buffer controller for decompression.
+ * This controller is the top level of the JPEG decompressor proper.
+ * The coefficient buffer lies between entropy decoding and inverse-DCT steps.
+ *
+ * In buffered-image mode, this controller is the interface between
+ * input-oriented processing and output-oriented processing.
+ * Also, the input side (only) is used when reading a file for transcoding.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jpegcomp.h"
+
+/* Block smoothing is only applicable for progressive JPEG, so: */
+#ifndef D_PROGRESSIVE_SUPPORTED
+#undef BLOCK_SMOOTHING_SUPPORTED
+#endif
+
+/* Private buffer controller object */
+
+typedef struct {
+  struct jpeg_d_coef_controller pub; /* public fields */
+
+  /* These variables keep track of the current location of the input side. */
+  /* cinfo->input_iMCU_row is also used for this. */
+  JDIMENSION MCU_ctr;		/* counts MCUs processed in current row */
+  int MCU_vert_offset;		/* counts MCU rows within iMCU row */
+  int MCU_rows_per_iMCU_row;	/* number of such rows needed */
+
+  /* The output side's location is represented by cinfo->output_iMCU_row. */
+
+  /* In single-pass modes, it's sufficient to buffer just one MCU.
+   * We allocate a workspace of D_MAX_BLOCKS_IN_MCU coefficient blocks,
+   * and let the entropy decoder write into that workspace each time.
+   * (On 80x86, the workspace is FAR even though it's not really very big;
+   * this is to keep the module interfaces unchanged when a large coefficient
+   * buffer is necessary.)
+   * In multi-pass modes, this array points to the current MCU's blocks
+   * within the virtual arrays; it is used only by the input side.
+   */
+  JBLOCKROW MCU_buffer[D_MAX_BLOCKS_IN_MCU];
+
+  /* Temporary workspace for one MCU */
+  JCOEF * workspace;
+
+#ifdef D_MULTISCAN_FILES_SUPPORTED
+  /* In multi-pass modes, we need a virtual block array for each component. */
+  jvirt_barray_ptr whole_image[MAX_COMPONENTS];
+#endif
+
+#ifdef BLOCK_SMOOTHING_SUPPORTED
+  /* When doing block smoothing, we latch coefficient Al values here */
+  int * coef_bits_latch;
+#define SAVED_COEFS  6		/* we save coef_bits[0..5] */
+#endif
+} my_coef_controller;
+
+typedef my_coef_controller * my_coef_ptr;
+
+/* Forward declarations */
+METHODDEF(int) decompress_onepass
+	JPP((j_decompress_ptr cinfo, JSAMPIMAGE output_buf));
+#ifdef D_MULTISCAN_FILES_SUPPORTED
+METHODDEF(int) decompress_data
+	JPP((j_decompress_ptr cinfo, JSAMPIMAGE output_buf));
+#endif
+#ifdef BLOCK_SMOOTHING_SUPPORTED
+LOCAL(boolean) smoothing_ok JPP((j_decompress_ptr cinfo));
+METHODDEF(int) decompress_smooth_data
+	JPP((j_decompress_ptr cinfo, JSAMPIMAGE output_buf));
+#endif
+
+
+LOCAL(void)
+start_iMCU_row (j_decompress_ptr cinfo)
+/* Reset within-iMCU-row counters for a new row (input side) */
+{
+  my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
+
+  /* In an interleaved scan, an MCU row is the same as an iMCU row.
+   * In a noninterleaved scan, an iMCU row has v_samp_factor MCU rows.
+   * But at the bottom of the image, process only what's left.
+   */
+  if (cinfo->comps_in_scan > 1) {
+    coef->MCU_rows_per_iMCU_row = 1;
+  } else {
+    if (cinfo->input_iMCU_row < (cinfo->total_iMCU_rows-1))
+      coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->v_samp_factor;
+    else
+      coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->last_row_height;
+  }
+
+  coef->MCU_ctr = 0;
+  coef->MCU_vert_offset = 0;
+}
+
+
+/*
+ * Initialize for an input processing pass.
+ */
+
+METHODDEF(void)
+start_input_pass (j_decompress_ptr cinfo)
+{
+  cinfo->input_iMCU_row = 0;
+  start_iMCU_row(cinfo);
+}
+
+
+/*
+ * Initialize for an output processing pass.
+ */
+
+METHODDEF(void)
+start_output_pass (j_decompress_ptr cinfo)
+{
+#ifdef BLOCK_SMOOTHING_SUPPORTED
+  my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
+
+  /* If multipass, check to see whether to use block smoothing on this pass */
+  if (coef->pub.coef_arrays != NULL) {
+    if (cinfo->do_block_smoothing && smoothing_ok(cinfo))
+      coef->pub.decompress_data = decompress_smooth_data;
+    else
+      coef->pub.decompress_data = decompress_data;
+  }
+#endif
+  cinfo->output_iMCU_row = 0;
+}
+
+
+/*
+ * Decompress and return some data in the single-pass case.
+ * Always attempts to emit one fully interleaved MCU row ("iMCU" row).
+ * Input and output must run in lockstep since we have only a one-MCU buffer.
+ * Return value is JPEG_ROW_COMPLETED, JPEG_SCAN_COMPLETED, or JPEG_SUSPENDED.
+ *
+ * NB: output_buf contains a plane for each component in image,
+ * which we index according to the component's SOF position.
+ */
+
+METHODDEF(int)
+decompress_onepass (j_decompress_ptr cinfo, JSAMPIMAGE output_buf)
+{
+  my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
+  JDIMENSION MCU_col_num;	/* index of current MCU within row */
+  JDIMENSION last_MCU_col = cinfo->MCUs_per_row - 1;
+  JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1;
+  int blkn, ci, xindex, yindex, yoffset, useful_width;
+  JSAMPARRAY output_ptr;
+  JDIMENSION start_col, output_col;
+  jpeg_component_info *compptr;
+  inverse_DCT_method_ptr inverse_DCT;
+
+  /* Loop to process as much as one whole iMCU row */
+  for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row;
+       yoffset++) {
+    for (MCU_col_num = coef->MCU_ctr; MCU_col_num <= last_MCU_col;
+	 MCU_col_num++) {
+      /* Try to fetch an MCU.  Entropy decoder expects buffer to be zeroed. */
+      jzero_far((void FAR *) coef->MCU_buffer[0],
+		(size_t) (cinfo->blocks_in_MCU * SIZEOF(JBLOCK)));
+      if (! (*cinfo->entropy->decode_mcu) (cinfo, coef->MCU_buffer)) {
+	/* Suspension forced; update state counters and exit */
+	coef->MCU_vert_offset = yoffset;
+	coef->MCU_ctr = MCU_col_num;
+	return JPEG_SUSPENDED;
+      }
+      /* Determine where data should go in output_buf and do the IDCT thing.
+       * We skip dummy blocks at the right and bottom edges (but blkn gets
+       * incremented past them!).  Note the inner loop relies on having
+       * allocated the MCU_buffer[] blocks sequentially.
+       */
+      blkn = 0;			/* index of current DCT block within MCU */
+      for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
+	compptr = cinfo->cur_comp_info[ci];
+	/* Don't bother to IDCT an uninteresting component. */
+	if (! compptr->component_needed) {
+	  blkn += compptr->MCU_blocks;
+	  continue;
+	}
+	inverse_DCT = cinfo->idct->inverse_DCT[compptr->component_index];
+	useful_width = (MCU_col_num < last_MCU_col) ? compptr->MCU_width
+						    : compptr->last_col_width;
+	output_ptr = output_buf[compptr->component_index] +
+	  yoffset * compptr->_DCT_scaled_size;
+	start_col = MCU_col_num * compptr->MCU_sample_width;
+	for (yindex = 0; yindex < compptr->MCU_height; yindex++) {
+	  if (cinfo->input_iMCU_row < last_iMCU_row ||
+	      yoffset+yindex < compptr->last_row_height) {
+	    output_col = start_col;
+	    for (xindex = 0; xindex < useful_width; xindex++) {
+	      (*inverse_DCT) (cinfo, compptr,
+			      (JCOEFPTR) coef->MCU_buffer[blkn+xindex],
+			      output_ptr, output_col);
+	      output_col += compptr->_DCT_scaled_size;
+	    }
+	  }
+	  blkn += compptr->MCU_width;
+	  output_ptr += compptr->_DCT_scaled_size;
+	}
+      }
+    }
+    /* Completed an MCU row, but perhaps not an iMCU row */
+    coef->MCU_ctr = 0;
+  }
+  /* Completed the iMCU row, advance counters for next one */
+  cinfo->output_iMCU_row++;
+  if (++(cinfo->input_iMCU_row) < cinfo->total_iMCU_rows) {
+    start_iMCU_row(cinfo);
+    return JPEG_ROW_COMPLETED;
+  }
+  /* Completed the scan */
+  (*cinfo->inputctl->finish_input_pass) (cinfo);
+  return JPEG_SCAN_COMPLETED;
+}
+
+
+/*
+ * Dummy consume-input routine for single-pass operation.
+ */
+
+METHODDEF(int)
+dummy_consume_data (j_decompress_ptr cinfo)
+{
+  return JPEG_SUSPENDED;	/* Always indicate nothing was done */
+}
+
+
+#ifdef D_MULTISCAN_FILES_SUPPORTED
+
+/*
+ * Consume input data and store it in the full-image coefficient buffer.
+ * We read as much as one fully interleaved MCU row ("iMCU" row) per call,
+ * ie, v_samp_factor block rows for each component in the scan.
+ * Return value is JPEG_ROW_COMPLETED, JPEG_SCAN_COMPLETED, or JPEG_SUSPENDED.
+ */
+
+METHODDEF(int)
+consume_data (j_decompress_ptr cinfo)
+{
+  my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
+  JDIMENSION MCU_col_num;	/* index of current MCU within row */
+  int blkn, ci, xindex, yindex, yoffset;
+  JDIMENSION start_col;
+  JBLOCKARRAY buffer[MAX_COMPS_IN_SCAN];
+  JBLOCKROW buffer_ptr;
+  jpeg_component_info *compptr;
+
+  /* Align the virtual buffers for the components used in this scan. */
+  for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
+    compptr = cinfo->cur_comp_info[ci];
+    buffer[ci] = (*cinfo->mem->access_virt_barray)
+      ((j_common_ptr) cinfo, coef->whole_image[compptr->component_index],
+       cinfo->input_iMCU_row * compptr->v_samp_factor,
+       (JDIMENSION) compptr->v_samp_factor, TRUE);
+    /* Note: entropy decoder expects buffer to be zeroed,
+     * but this is handled automatically by the memory manager
+     * because we requested a pre-zeroed array.
+     */
+  }
+
+  /* Loop to process one whole iMCU row */
+  for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row;
+       yoffset++) {
+    for (MCU_col_num = coef->MCU_ctr; MCU_col_num < cinfo->MCUs_per_row;
+	 MCU_col_num++) {
+      /* Construct list of pointers to DCT blocks belonging to this MCU */
+      blkn = 0;			/* index of current DCT block within MCU */
+      for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
+	compptr = cinfo->cur_comp_info[ci];
+	start_col = MCU_col_num * compptr->MCU_width;
+	for (yindex = 0; yindex < compptr->MCU_height; yindex++) {
+	  buffer_ptr = buffer[ci][yindex+yoffset] + start_col;
+	  for (xindex = 0; xindex < compptr->MCU_width; xindex++) {
+	    coef->MCU_buffer[blkn++] = buffer_ptr++;
+	  }
+	}
+      }
+      /* Try to fetch the MCU. */
+      if (! (*cinfo->entropy->decode_mcu) (cinfo, coef->MCU_buffer)) {
+	/* Suspension forced; update state counters and exit */
+	coef->MCU_vert_offset = yoffset;
+	coef->MCU_ctr = MCU_col_num;
+	return JPEG_SUSPENDED;
+      }
+    }
+    /* Completed an MCU row, but perhaps not an iMCU row */
+    coef->MCU_ctr = 0;
+  }
+  /* Completed the iMCU row, advance counters for next one */
+  if (++(cinfo->input_iMCU_row) < cinfo->total_iMCU_rows) {
+    start_iMCU_row(cinfo);
+    return JPEG_ROW_COMPLETED;
+  }
+  /* Completed the scan */
+  (*cinfo->inputctl->finish_input_pass) (cinfo);
+  return JPEG_SCAN_COMPLETED;
+}
+
+
+/*
+ * Decompress and return some data in the multi-pass case.
+ * Always attempts to emit one fully interleaved MCU row ("iMCU" row).
+ * Return value is JPEG_ROW_COMPLETED, JPEG_SCAN_COMPLETED, or JPEG_SUSPENDED.
+ *
+ * NB: output_buf contains a plane for each component in image.
+ */
+
+METHODDEF(int)
+decompress_data (j_decompress_ptr cinfo, JSAMPIMAGE output_buf)
+{
+  my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
+  JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1;
+  JDIMENSION block_num;
+  int ci, block_row, block_rows;
+  JBLOCKARRAY buffer;
+  JBLOCKROW buffer_ptr;
+  JSAMPARRAY output_ptr;
+  JDIMENSION output_col;
+  jpeg_component_info *compptr;
+  inverse_DCT_method_ptr inverse_DCT;
+
+  /* Force some input to be done if we are getting ahead of the input. */
+  while (cinfo->input_scan_number < cinfo->output_scan_number ||
+	 (cinfo->input_scan_number == cinfo->output_scan_number &&
+	  cinfo->input_iMCU_row <= cinfo->output_iMCU_row)) {
+    if ((*cinfo->inputctl->consume_input)(cinfo) == JPEG_SUSPENDED)
+      return JPEG_SUSPENDED;
+  }
+
+  /* OK, output from the virtual arrays. */
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    /* Don't bother to IDCT an uninteresting component. */
+    if (! compptr->component_needed)
+      continue;
+    /* Align the virtual buffer for this component. */
+    buffer = (*cinfo->mem->access_virt_barray)
+      ((j_common_ptr) cinfo, coef->whole_image[ci],
+       cinfo->output_iMCU_row * compptr->v_samp_factor,
+       (JDIMENSION) compptr->v_samp_factor, FALSE);
+    /* Count non-dummy DCT block rows in this iMCU row. */
+    if (cinfo->output_iMCU_row < last_iMCU_row)
+      block_rows = compptr->v_samp_factor;
+    else {
+      /* NB: can't use last_row_height here; it is input-side-dependent! */
+      block_rows = (int) (compptr->height_in_blocks % compptr->v_samp_factor);
+      if (block_rows == 0) block_rows = compptr->v_samp_factor;
+    }
+    inverse_DCT = cinfo->idct->inverse_DCT[ci];
+    output_ptr = output_buf[ci];
+    /* Loop over all DCT blocks to be processed. */
+    for (block_row = 0; block_row < block_rows; block_row++) {
+      buffer_ptr = buffer[block_row];
+      output_col = 0;
+      for (block_num = 0; block_num < compptr->width_in_blocks; block_num++) {
+	(*inverse_DCT) (cinfo, compptr, (JCOEFPTR) buffer_ptr,
+			output_ptr, output_col);
+	buffer_ptr++;
+	output_col += compptr->_DCT_scaled_size;
+      }
+      output_ptr += compptr->_DCT_scaled_size;
+    }
+  }
+
+  if (++(cinfo->output_iMCU_row) < cinfo->total_iMCU_rows)
+    return JPEG_ROW_COMPLETED;
+  return JPEG_SCAN_COMPLETED;
+}
+
+#endif /* D_MULTISCAN_FILES_SUPPORTED */
+
+
+#ifdef BLOCK_SMOOTHING_SUPPORTED
+
+/*
+ * This code applies interblock smoothing as described by section K.8
+ * of the JPEG standard: the first 5 AC coefficients are estimated from
+ * the DC values of a DCT block and its 8 neighboring blocks.
+ * We apply smoothing only for progressive JPEG decoding, and only if
+ * the coefficients it can estimate are not yet known to full precision.
+ */
+
+/* Natural-order array positions of the first 5 zigzag-order coefficients */
+#define Q01_POS  1
+#define Q10_POS  8
+#define Q20_POS  16
+#define Q11_POS  9
+#define Q02_POS  2
+
+/*
+ * Determine whether block smoothing is applicable and safe.
+ * We also latch the current states of the coef_bits[] entries for the
+ * AC coefficients; otherwise, if the input side of the decompressor
+ * advances into a new scan, we might think the coefficients are known
+ * more accurately than they really are.
+ */
+
+LOCAL(boolean)
+smoothing_ok (j_decompress_ptr cinfo)
+{
+  my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
+  boolean smoothing_useful = FALSE;
+  int ci, coefi;
+  jpeg_component_info *compptr;
+  JQUANT_TBL * qtable;
+  int * coef_bits;
+  int * coef_bits_latch;
+
+  if (! cinfo->progressive_mode || cinfo->coef_bits == NULL)
+    return FALSE;
+
+  /* Allocate latch area if not already done */
+  if (coef->coef_bits_latch == NULL)
+    coef->coef_bits_latch = (int *)
+      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				  cinfo->num_components *
+				  (SAVED_COEFS * SIZEOF(int)));
+  coef_bits_latch = coef->coef_bits_latch;
+
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    /* All components' quantization values must already be latched. */
+    if ((qtable = compptr->quant_table) == NULL)
+      return FALSE;
+    /* Verify DC & first 5 AC quantizers are nonzero to avoid zero-divide. */
+    if (qtable->quantval[0] == 0 ||
+	qtable->quantval[Q01_POS] == 0 ||
+	qtable->quantval[Q10_POS] == 0 ||
+	qtable->quantval[Q20_POS] == 0 ||
+	qtable->quantval[Q11_POS] == 0 ||
+	qtable->quantval[Q02_POS] == 0)
+      return FALSE;
+    /* DC values must be at least partly known for all components. */
+    coef_bits = cinfo->coef_bits[ci];
+    if (coef_bits[0] < 0)
+      return FALSE;
+    /* Block smoothing is helpful if some AC coefficients remain inaccurate. */
+    for (coefi = 1; coefi <= 5; coefi++) {
+      coef_bits_latch[coefi] = coef_bits[coefi];
+      if (coef_bits[coefi] != 0)
+	smoothing_useful = TRUE;
+    }
+    coef_bits_latch += SAVED_COEFS;
+  }
+
+  return smoothing_useful;
+}
+
+
+/*
+ * Variant of decompress_data for use when doing block smoothing.
+ */
+
+METHODDEF(int)
+decompress_smooth_data (j_decompress_ptr cinfo, JSAMPIMAGE output_buf)
+{
+  my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
+  JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1;
+  JDIMENSION block_num, last_block_column;
+  int ci, block_row, block_rows, access_rows;
+  JBLOCKARRAY buffer;
+  JBLOCKROW buffer_ptr, prev_block_row, next_block_row;
+  JSAMPARRAY output_ptr;
+  JDIMENSION output_col;
+  jpeg_component_info *compptr;
+  inverse_DCT_method_ptr inverse_DCT;
+  boolean first_row, last_row;
+  JCOEF * workspace;
+  int *coef_bits;
+  JQUANT_TBL *quanttbl;
+  INT32 Q00,Q01,Q02,Q10,Q11,Q20, num;
+  int DC1,DC2,DC3,DC4,DC5,DC6,DC7,DC8,DC9;
+  int Al, pred;
+
+  /* Keep a local variable to avoid looking it up more than once */
+  workspace = coef->workspace;
+
+  /* Force some input to be done if we are getting ahead of the input. */
+  while (cinfo->input_scan_number <= cinfo->output_scan_number &&
+	 ! cinfo->inputctl->eoi_reached) {
+    if (cinfo->input_scan_number == cinfo->output_scan_number) {
+      /* If input is working on current scan, we ordinarily want it to
+       * have completed the current row.  But if input scan is DC,
+       * we want it to keep one row ahead so that next block row's DC
+       * values are up to date.
+       */
+      JDIMENSION delta = (cinfo->Ss == 0) ? 1 : 0;
+      if (cinfo->input_iMCU_row > cinfo->output_iMCU_row+delta)
+	break;
+    }
+    if ((*cinfo->inputctl->consume_input)(cinfo) == JPEG_SUSPENDED)
+      return JPEG_SUSPENDED;
+  }
+
+  /* OK, output from the virtual arrays. */
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    /* Don't bother to IDCT an uninteresting component. */
+    if (! compptr->component_needed)
+      continue;
+    /* Count non-dummy DCT block rows in this iMCU row. */
+    if (cinfo->output_iMCU_row < last_iMCU_row) {
+      block_rows = compptr->v_samp_factor;
+      access_rows = block_rows * 2; /* this and next iMCU row */
+      last_row = FALSE;
+    } else {
+      /* NB: can't use last_row_height here; it is input-side-dependent! */
+      block_rows = (int) (compptr->height_in_blocks % compptr->v_samp_factor);
+      if (block_rows == 0) block_rows = compptr->v_samp_factor;
+      access_rows = block_rows; /* this iMCU row only */
+      last_row = TRUE;
+    }
+    /* Align the virtual buffer for this component. */
+    if (cinfo->output_iMCU_row > 0) {
+      access_rows += compptr->v_samp_factor; /* prior iMCU row too */
+      buffer = (*cinfo->mem->access_virt_barray)
+	((j_common_ptr) cinfo, coef->whole_image[ci],
+	 (cinfo->output_iMCU_row - 1) * compptr->v_samp_factor,
+	 (JDIMENSION) access_rows, FALSE);
+      buffer += compptr->v_samp_factor;	/* point to current iMCU row */
+      first_row = FALSE;
+    } else {
+      buffer = (*cinfo->mem->access_virt_barray)
+	((j_common_ptr) cinfo, coef->whole_image[ci],
+	 (JDIMENSION) 0, (JDIMENSION) access_rows, FALSE);
+      first_row = TRUE;
+    }
+    /* Fetch component-dependent info */
+    coef_bits = coef->coef_bits_latch + (ci * SAVED_COEFS);
+    quanttbl = compptr->quant_table;
+    Q00 = quanttbl->quantval[0];
+    Q01 = quanttbl->quantval[Q01_POS];
+    Q10 = quanttbl->quantval[Q10_POS];
+    Q20 = quanttbl->quantval[Q20_POS];
+    Q11 = quanttbl->quantval[Q11_POS];
+    Q02 = quanttbl->quantval[Q02_POS];
+    inverse_DCT = cinfo->idct->inverse_DCT[ci];
+    output_ptr = output_buf[ci];
+    /* Loop over all DCT blocks to be processed. */
+    for (block_row = 0; block_row < block_rows; block_row++) {
+      buffer_ptr = buffer[block_row];
+      if (first_row && block_row == 0)
+	prev_block_row = buffer_ptr;
+      else
+	prev_block_row = buffer[block_row-1];
+      if (last_row && block_row == block_rows-1)
+	next_block_row = buffer_ptr;
+      else
+	next_block_row = buffer[block_row+1];
+      /* We fetch the surrounding DC values using a sliding-register approach.
+       * Initialize all nine here so as to do the right thing on narrow pics.
+       */
+      DC1 = DC2 = DC3 = (int) prev_block_row[0][0];
+      DC4 = DC5 = DC6 = (int) buffer_ptr[0][0];
+      DC7 = DC8 = DC9 = (int) next_block_row[0][0];
+      output_col = 0;
+      last_block_column = compptr->width_in_blocks - 1;
+      for (block_num = 0; block_num <= last_block_column; block_num++) {
+	/* Fetch current DCT block into workspace so we can modify it. */
+	jcopy_block_row(buffer_ptr, (JBLOCKROW) workspace, (JDIMENSION) 1);
+	/* Update DC values */
+	if (block_num < last_block_column) {
+	  DC3 = (int) prev_block_row[1][0];
+	  DC6 = (int) buffer_ptr[1][0];
+	  DC9 = (int) next_block_row[1][0];
+	}
+	/* Compute coefficient estimates per K.8.
+	 * An estimate is applied only if coefficient is still zero,
+	 * and is not known to be fully accurate.
+	 */
+	/* AC01 */
+	if ((Al=coef_bits[1]) != 0 && workspace[1] == 0) {
+	  num = 36 * Q00 * (DC4 - DC6);
+	  if (num >= 0) {
+	    pred = (int) (((Q01<<7) + num) / (Q01<<8));
+	    if (Al > 0 && pred >= (1<<Al))
+	      pred = (1<<Al)-1;
+	  } else {
+	    pred = (int) (((Q01<<7) - num) / (Q01<<8));
+	    if (Al > 0 && pred >= (1<<Al))
+	      pred = (1<<Al)-1;
+	    pred = -pred;
+	  }
+	  workspace[1] = (JCOEF) pred;
+	}
+	/* AC10 */
+	if ((Al=coef_bits[2]) != 0 && workspace[8] == 0) {
+	  num = 36 * Q00 * (DC2 - DC8);
+	  if (num >= 0) {
+	    pred = (int) (((Q10<<7) + num) / (Q10<<8));
+	    if (Al > 0 && pred >= (1<<Al))
+	      pred = (1<<Al)-1;
+	  } else {
+	    pred = (int) (((Q10<<7) - num) / (Q10<<8));
+	    if (Al > 0 && pred >= (1<<Al))
+	      pred = (1<<Al)-1;
+	    pred = -pred;
+	  }
+	  workspace[8] = (JCOEF) pred;
+	}
+	/* AC20 */
+	if ((Al=coef_bits[3]) != 0 && workspace[16] == 0) {
+	  num = 9 * Q00 * (DC2 + DC8 - 2*DC5);
+	  if (num >= 0) {
+	    pred = (int) (((Q20<<7) + num) / (Q20<<8));
+	    if (Al > 0 && pred >= (1<<Al))
+	      pred = (1<<Al)-1;
+	  } else {
+	    pred = (int) (((Q20<<7) - num) / (Q20<<8));
+	    if (Al > 0 && pred >= (1<<Al))
+	      pred = (1<<Al)-1;
+	    pred = -pred;
+	  }
+	  workspace[16] = (JCOEF) pred;
+	}
+	/* AC11 */
+	if ((Al=coef_bits[4]) != 0 && workspace[9] == 0) {
+	  num = 5 * Q00 * (DC1 - DC3 - DC7 + DC9);
+	  if (num >= 0) {
+	    pred = (int) (((Q11<<7) + num) / (Q11<<8));
+	    if (Al > 0 && pred >= (1<<Al))
+	      pred = (1<<Al)-1;
+	  } else {
+	    pred = (int) (((Q11<<7) - num) / (Q11<<8));
+	    if (Al > 0 && pred >= (1<<Al))
+	      pred = (1<<Al)-1;
+	    pred = -pred;
+	  }
+	  workspace[9] = (JCOEF) pred;
+	}
+	/* AC02 */
+	if ((Al=coef_bits[5]) != 0 && workspace[2] == 0) {
+	  num = 9 * Q00 * (DC4 + DC6 - 2*DC5);
+	  if (num >= 0) {
+	    pred = (int) (((Q02<<7) + num) / (Q02<<8));
+	    if (Al > 0 && pred >= (1<<Al))
+	      pred = (1<<Al)-1;
+	  } else {
+	    pred = (int) (((Q02<<7) - num) / (Q02<<8));
+	    if (Al > 0 && pred >= (1<<Al))
+	      pred = (1<<Al)-1;
+	    pred = -pred;
+	  }
+	  workspace[2] = (JCOEF) pred;
+	}
+	/* OK, do the IDCT */
+	(*inverse_DCT) (cinfo, compptr, (JCOEFPTR) workspace,
+			output_ptr, output_col);
+	/* Advance for next column */
+	DC1 = DC2; DC2 = DC3;
+	DC4 = DC5; DC5 = DC6;
+	DC7 = DC8; DC8 = DC9;
+	buffer_ptr++, prev_block_row++, next_block_row++;
+	output_col += compptr->_DCT_scaled_size;
+      }
+      output_ptr += compptr->_DCT_scaled_size;
+    }
+  }
+
+  if (++(cinfo->output_iMCU_row) < cinfo->total_iMCU_rows)
+    return JPEG_ROW_COMPLETED;
+  return JPEG_SCAN_COMPLETED;
+}
+
+#endif /* BLOCK_SMOOTHING_SUPPORTED */
+
+
+/*
+ * Initialize coefficient buffer controller.
+ */
+
+GLOBAL(void)
+jinit_d_coef_controller (j_decompress_ptr cinfo, boolean need_full_buffer)
+{
+  my_coef_ptr coef;
+
+  coef = (my_coef_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				SIZEOF(my_coef_controller));
+  cinfo->coef = (struct jpeg_d_coef_controller *) coef;
+  coef->pub.start_input_pass = start_input_pass;
+  coef->pub.start_output_pass = start_output_pass;
+#ifdef BLOCK_SMOOTHING_SUPPORTED
+  coef->coef_bits_latch = NULL;
+#endif
+
+  /* Create the coefficient buffer. */
+  if (need_full_buffer) {
+#ifdef D_MULTISCAN_FILES_SUPPORTED
+    /* Allocate a full-image virtual array for each component, */
+    /* padded to a multiple of samp_factor DCT blocks in each direction. */
+    /* Note we ask for a pre-zeroed array. */
+    int ci, access_rows;
+    jpeg_component_info *compptr;
+
+    for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+	 ci++, compptr++) {
+      access_rows = compptr->v_samp_factor;
+#ifdef BLOCK_SMOOTHING_SUPPORTED
+      /* If block smoothing could be used, need a bigger window */
+      if (cinfo->progressive_mode)
+	access_rows *= 3;
+#endif
+      coef->whole_image[ci] = (*cinfo->mem->request_virt_barray)
+	((j_common_ptr) cinfo, JPOOL_IMAGE, TRUE,
+	 (JDIMENSION) jround_up((long) compptr->width_in_blocks,
+				(long) compptr->h_samp_factor),
+	 (JDIMENSION) jround_up((long) compptr->height_in_blocks,
+				(long) compptr->v_samp_factor),
+	 (JDIMENSION) access_rows);
+    }
+    coef->pub.consume_data = consume_data;
+    coef->pub.decompress_data = decompress_data;
+    coef->pub.coef_arrays = coef->whole_image; /* link to virtual arrays */
+#else
+    ERREXIT(cinfo, JERR_NOT_COMPILED);
+#endif
+  } else {
+    /* We only need a single-MCU buffer. */
+    JBLOCKROW buffer;
+    int i;
+
+    buffer = (JBLOCKROW)
+      (*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				  D_MAX_BLOCKS_IN_MCU * SIZEOF(JBLOCK));
+    for (i = 0; i < D_MAX_BLOCKS_IN_MCU; i++) {
+      coef->MCU_buffer[i] = buffer + i;
+    }
+    coef->pub.consume_data = dummy_consume_data;
+    coef->pub.decompress_data = decompress_onepass;
+    coef->pub.coef_arrays = NULL; /* flag for no virtual arrays */
+  }
+
+  /* Allocate the workspace buffer */
+  coef->workspace = (JCOEF *)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+                                SIZEOF(JCOEF) * DCTSIZE2);
+}
diff --git a/src/libjpeg-turbo/jdcolext.c.inc b/src/libjpeg-turbo/jdcolext.c.inc
new file mode 100644
index 0000000..07da949
--- /dev/null
+++ b/src/libjpeg-turbo/jdcolext.c.inc
@@ -0,0 +1,104 @@
+/*
+ * jdcolext.c
+ *
+ * Copyright (C) 1991-1997, Thomas G. Lane.
+ * Copyright (C) 2009, 2011, D. R. Commander.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains output colorspace conversion routines.
+ */
+
+
+/* This file is included by jdcolor.c */
+
+
+/*
+ * Convert some rows of samples to the output colorspace.
+ *
+ * Note that we change from noninterleaved, one-plane-per-component format
+ * to interleaved-pixel format.  The output buffer is therefore three times
+ * as wide as the input buffer.
+ * A starting row offset is provided only for the input buffer.  The caller
+ * can easily adjust the passed output_buf value to accommodate any row
+ * offset required on that side.
+ */
+
+INLINE
+LOCAL(void)
+ycc_rgb_convert_internal (j_decompress_ptr cinfo,
+                          JSAMPIMAGE input_buf, JDIMENSION input_row,
+                          JSAMPARRAY output_buf, int num_rows)
+{
+  my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
+  register int y, cb, cr;
+  register JSAMPROW outptr;
+  register JSAMPROW inptr0, inptr1, inptr2;
+  register JDIMENSION col;
+  JDIMENSION num_cols = cinfo->output_width;
+  /* copy these pointers into registers if possible */
+  register JSAMPLE * range_limit = cinfo->sample_range_limit;
+  register int * Crrtab = cconvert->Cr_r_tab;
+  register int * Cbbtab = cconvert->Cb_b_tab;
+  register INT32 * Crgtab = cconvert->Cr_g_tab;
+  register INT32 * Cbgtab = cconvert->Cb_g_tab;
+  SHIFT_TEMPS
+
+  while (--num_rows >= 0) {
+    inptr0 = input_buf[0][input_row];
+    inptr1 = input_buf[1][input_row];
+    inptr2 = input_buf[2][input_row];
+    input_row++;
+    outptr = *output_buf++;
+    for (col = 0; col < num_cols; col++) {
+      y  = GETJSAMPLE(inptr0[col]);
+      cb = GETJSAMPLE(inptr1[col]);
+      cr = GETJSAMPLE(inptr2[col]);
+      /* Range-limiting is essential due to noise introduced by DCT losses. */
+      outptr[RGB_RED] =   range_limit[y + Crrtab[cr]];
+      outptr[RGB_GREEN] = range_limit[y +
+			      ((int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
+						 SCALEBITS))];
+      outptr[RGB_BLUE] =  range_limit[y + Cbbtab[cb]];
+      /* Set unused byte to 0xFF so it can be interpreted as an opaque */
+      /* alpha channel value */
+#ifdef RGB_ALPHA
+      outptr[RGB_ALPHA] = 0xFF;
+#endif
+      outptr += RGB_PIXELSIZE;
+    }
+  }
+}
+
+
+/*
+ * Convert grayscale to RGB: just duplicate the graylevel three times.
+ * This is provided to support applications that don't want to cope
+ * with grayscale as a separate case.
+ */
+
+INLINE
+LOCAL(void)
+gray_rgb_convert_internal (j_decompress_ptr cinfo,
+                           JSAMPIMAGE input_buf, JDIMENSION input_row,
+                           JSAMPARRAY output_buf, int num_rows)
+{
+  register JSAMPROW inptr, outptr;
+  register JDIMENSION col;
+  JDIMENSION num_cols = cinfo->output_width;
+
+  while (--num_rows >= 0) {
+    inptr = input_buf[0][input_row++];
+    outptr = *output_buf++;
+    for (col = 0; col < num_cols; col++) {
+      /* We can dispense with GETJSAMPLE() here */
+      outptr[RGB_RED] = outptr[RGB_GREEN] = outptr[RGB_BLUE] = inptr[col];
+      /* Set unused byte to 0xFF so it can be interpreted as an opaque */
+      /* alpha channel value */
+#ifdef RGB_ALPHA
+      outptr[RGB_ALPHA] = 0xFF;
+#endif
+      outptr += RGB_PIXELSIZE;
+    }
+  }
+}
diff --git a/src/libjpeg-turbo/jdcolor.c b/src/libjpeg-turbo/jdcolor.c
new file mode 100644
index 0000000..66c4520
--- /dev/null
+++ b/src/libjpeg-turbo/jdcolor.c
@@ -0,0 +1,529 @@
+/*
+ * jdcolor.c
+ *
+ * Copyright (C) 1991-1997, Thomas G. Lane.
+ * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+ * Copyright (C) 2009, 2011, D. R. Commander.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains output colorspace conversion routines.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jsimd.h"
+#include "config.h"
+
+
+/* Private subobject */
+
+typedef struct {
+  struct jpeg_color_deconverter pub; /* public fields */
+
+  /* Private state for YCC->RGB conversion */
+  int * Cr_r_tab;		/* => table for Cr to R conversion */
+  int * Cb_b_tab;		/* => table for Cb to B conversion */
+  INT32 * Cr_g_tab;		/* => table for Cr to G conversion */
+  INT32 * Cb_g_tab;		/* => table for Cb to G conversion */
+} my_color_deconverter;
+
+typedef my_color_deconverter * my_cconvert_ptr;
+
+
+/**************** YCbCr -> RGB conversion: most common case **************/
+
+/*
+ * YCbCr is defined per CCIR 601-1, except that Cb and Cr are
+ * normalized to the range 0..MAXJSAMPLE rather than -0.5 .. 0.5.
+ * The conversion equations to be implemented are therefore
+ *	R = Y                + 1.40200 * Cr
+ *	G = Y - 0.34414 * Cb - 0.71414 * Cr
+ *	B = Y + 1.77200 * Cb
+ * where Cb and Cr represent the incoming values less CENTERJSAMPLE.
+ * (These numbers are derived from TIFF 6.0 section 21, dated 3-June-92.)
+ *
+ * To avoid floating-point arithmetic, we represent the fractional constants
+ * as integers scaled up by 2^16 (about 4 digits precision); we have to divide
+ * the products by 2^16, with appropriate rounding, to get the correct answer.
+ * Notice that Y, being an integral input, does not contribute any fraction
+ * so it need not participate in the rounding.
+ *
+ * For even more speed, we avoid doing any multiplications in the inner loop
+ * by precalculating the constants times Cb and Cr for all possible values.
+ * For 8-bit JSAMPLEs this is very reasonable (only 256 entries per table);
+ * for 12-bit samples it is still acceptable.  It's not very reasonable for
+ * 16-bit samples, but if you want lossless storage you shouldn't be changing
+ * colorspace anyway.
+ * The Cr=>R and Cb=>B values can be rounded to integers in advance; the
+ * values for the G calculation are left scaled up, since we must add them
+ * together before rounding.
+ */
+
+#define SCALEBITS	16	/* speediest right-shift on some machines */
+#define ONE_HALF	((INT32) 1 << (SCALEBITS-1))
+#define FIX(x)		((INT32) ((x) * (1L<<SCALEBITS) + 0.5))
+
+
+/* Include inline routines for colorspace extensions */
+
+#include "jdcolext.c.inc"
+#undef RGB_RED
+#undef RGB_GREEN
+#undef RGB_BLUE
+#undef RGB_PIXELSIZE
+
+#define RGB_RED EXT_RGB_RED
+#define RGB_GREEN EXT_RGB_GREEN
+#define RGB_BLUE EXT_RGB_BLUE
+#define RGB_PIXELSIZE EXT_RGB_PIXELSIZE
+#define ycc_rgb_convert_internal ycc_extrgb_convert_internal
+#define gray_rgb_convert_internal gray_extrgb_convert_internal
+#include "jdcolext.c.inc"
+#undef RGB_RED
+#undef RGB_GREEN
+#undef RGB_BLUE
+#undef RGB_PIXELSIZE
+#undef ycc_rgb_convert_internal
+#undef gray_rgb_convert_internal
+
+#define RGB_RED EXT_RGBX_RED
+#define RGB_GREEN EXT_RGBX_GREEN
+#define RGB_BLUE EXT_RGBX_BLUE
+#define RGB_ALPHA 3
+#define RGB_PIXELSIZE EXT_RGBX_PIXELSIZE
+#define ycc_rgb_convert_internal ycc_extrgbx_convert_internal
+#define gray_rgb_convert_internal gray_extrgbx_convert_internal
+#include "jdcolext.c.inc"
+#undef RGB_RED
+#undef RGB_GREEN
+#undef RGB_BLUE
+#undef RGB_ALPHA
+#undef RGB_PIXELSIZE
+#undef ycc_rgb_convert_internal
+#undef gray_rgb_convert_internal
+
+#define RGB_RED EXT_BGR_RED
+#define RGB_GREEN EXT_BGR_GREEN
+#define RGB_BLUE EXT_BGR_BLUE
+#define RGB_PIXELSIZE EXT_BGR_PIXELSIZE
+#define ycc_rgb_convert_internal ycc_extbgr_convert_internal
+#define gray_rgb_convert_internal gray_extbgr_convert_internal
+#include "jdcolext.c.inc"
+#undef RGB_RED
+#undef RGB_GREEN
+#undef RGB_BLUE
+#undef RGB_PIXELSIZE
+#undef ycc_rgb_convert_internal
+#undef gray_rgb_convert_internal
+
+#define RGB_RED EXT_BGRX_RED
+#define RGB_GREEN EXT_BGRX_GREEN
+#define RGB_BLUE EXT_BGRX_BLUE
+#define RGB_ALPHA 3
+#define RGB_PIXELSIZE EXT_BGRX_PIXELSIZE
+#define ycc_rgb_convert_internal ycc_extbgrx_convert_internal
+#define gray_rgb_convert_internal gray_extbgrx_convert_internal
+#include "jdcolext.c.inc"
+#undef RGB_RED
+#undef RGB_GREEN
+#undef RGB_BLUE
+#undef RGB_ALPHA
+#undef RGB_PIXELSIZE
+#undef ycc_rgb_convert_internal
+#undef gray_rgb_convert_internal
+
+#define RGB_RED EXT_XBGR_RED
+#define RGB_GREEN EXT_XBGR_GREEN
+#define RGB_BLUE EXT_XBGR_BLUE
+#define RGB_ALPHA 0
+#define RGB_PIXELSIZE EXT_XBGR_PIXELSIZE
+#define ycc_rgb_convert_internal ycc_extxbgr_convert_internal
+#define gray_rgb_convert_internal gray_extxbgr_convert_internal
+#include "jdcolext.c.inc"
+#undef RGB_RED
+#undef RGB_GREEN
+#undef RGB_BLUE
+#undef RGB_ALPHA
+#undef RGB_PIXELSIZE
+#undef ycc_rgb_convert_internal
+#undef gray_rgb_convert_internal
+
+#define RGB_RED EXT_XRGB_RED
+#define RGB_GREEN EXT_XRGB_GREEN
+#define RGB_BLUE EXT_XRGB_BLUE
+#define RGB_ALPHA 0
+#define RGB_PIXELSIZE EXT_XRGB_PIXELSIZE
+#define ycc_rgb_convert_internal ycc_extxrgb_convert_internal
+#define gray_rgb_convert_internal gray_extxrgb_convert_internal
+#include "jdcolext.c.inc"
+#undef RGB_RED
+#undef RGB_GREEN
+#undef RGB_BLUE
+#undef RGB_ALPHA
+#undef RGB_PIXELSIZE
+#undef ycc_rgb_convert_internal
+#undef gray_rgb_convert_internal
+
+
+/*
+ * Initialize tables for YCC->RGB colorspace conversion.
+ */
+
+LOCAL(void)
+build_ycc_rgb_table (j_decompress_ptr cinfo)
+{
+  my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
+  int i;
+  INT32 x;
+  SHIFT_TEMPS
+
+  cconvert->Cr_r_tab = (int *)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				(MAXJSAMPLE+1) * SIZEOF(int));
+  cconvert->Cb_b_tab = (int *)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				(MAXJSAMPLE+1) * SIZEOF(int));
+  cconvert->Cr_g_tab = (INT32 *)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				(MAXJSAMPLE+1) * SIZEOF(INT32));
+  cconvert->Cb_g_tab = (INT32 *)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				(MAXJSAMPLE+1) * SIZEOF(INT32));
+
+  for (i = 0, x = -CENTERJSAMPLE; i <= MAXJSAMPLE; i++, x++) {
+    /* i is the actual input pixel value, in the range 0..MAXJSAMPLE */
+    /* The Cb or Cr value we are thinking of is x = i - CENTERJSAMPLE */
+    /* Cr=>R value is nearest int to 1.40200 * x */
+    cconvert->Cr_r_tab[i] = (int)
+		    RIGHT_SHIFT(FIX(1.40200) * x + ONE_HALF, SCALEBITS);
+    /* Cb=>B value is nearest int to 1.77200 * x */
+    cconvert->Cb_b_tab[i] = (int)
+		    RIGHT_SHIFT(FIX(1.77200) * x + ONE_HALF, SCALEBITS);
+    /* Cr=>G value is scaled-up -0.71414 * x */
+    cconvert->Cr_g_tab[i] = (- FIX(0.71414)) * x;
+    /* Cb=>G value is scaled-up -0.34414 * x */
+    /* We also add in ONE_HALF so that need not do it in inner loop */
+    cconvert->Cb_g_tab[i] = (- FIX(0.34414)) * x + ONE_HALF;
+  }
+}
+
+
+/*
+ * Convert some rows of samples to the output colorspace.
+ */
+
+METHODDEF(void)
+ycc_rgb_convert (j_decompress_ptr cinfo,
+		 JSAMPIMAGE input_buf, JDIMENSION input_row,
+		 JSAMPARRAY output_buf, int num_rows)
+{
+  switch (cinfo->out_color_space) {
+    case JCS_EXT_RGB:
+      ycc_extrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
+                                  num_rows);
+      break;
+    case JCS_EXT_RGBX:
+    case JCS_EXT_RGBA:
+      ycc_extrgbx_convert_internal(cinfo, input_buf, input_row, output_buf,
+                                   num_rows);
+      break;
+    case JCS_EXT_BGR:
+      ycc_extbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
+                                  num_rows);
+      break;
+    case JCS_EXT_BGRX:
+    case JCS_EXT_BGRA:
+      ycc_extbgrx_convert_internal(cinfo, input_buf, input_row, output_buf,
+                                   num_rows);
+      break;
+    case JCS_EXT_XBGR:
+    case JCS_EXT_ABGR:
+      ycc_extxbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
+                                   num_rows);
+      break;
+    case JCS_EXT_XRGB:
+    case JCS_EXT_ARGB:
+      ycc_extxrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
+                                   num_rows);
+      break;
+    default:
+      ycc_rgb_convert_internal(cinfo, input_buf, input_row, output_buf,
+                               num_rows);
+      break;
+  }
+}
+
+
+/**************** Cases other than YCbCr -> RGB **************/
+
+
+/*
+ * Color conversion for no colorspace change: just copy the data,
+ * converting from separate-planes to interleaved representation.
+ */
+
+METHODDEF(void)
+null_convert (j_decompress_ptr cinfo,
+	      JSAMPIMAGE input_buf, JDIMENSION input_row,
+	      JSAMPARRAY output_buf, int num_rows)
+{
+  register JSAMPROW inptr, outptr;
+  register JDIMENSION count;
+  register int num_components = cinfo->num_components;
+  JDIMENSION num_cols = cinfo->output_width;
+  int ci;
+
+  while (--num_rows >= 0) {
+    for (ci = 0; ci < num_components; ci++) {
+      inptr = input_buf[ci][input_row];
+      outptr = output_buf[0] + ci;
+      for (count = num_cols; count > 0; count--) {
+	*outptr = *inptr++;	/* needn't bother with GETJSAMPLE() here */
+	outptr += num_components;
+      }
+    }
+    input_row++;
+    output_buf++;
+  }
+}
+
+
+/*
+ * Color conversion for grayscale: just copy the data.
+ * This also works for YCbCr -> grayscale conversion, in which
+ * we just copy the Y (luminance) component and ignore chrominance.
+ */
+
+METHODDEF(void)
+grayscale_convert (j_decompress_ptr cinfo,
+		   JSAMPIMAGE input_buf, JDIMENSION input_row,
+		   JSAMPARRAY output_buf, int num_rows)
+{
+  jcopy_sample_rows(input_buf[0], (int) input_row, output_buf, 0,
+		    num_rows, cinfo->output_width);
+}
+
+
+/*
+ * Convert grayscale to RGB
+ */
+
+METHODDEF(void)
+gray_rgb_convert (j_decompress_ptr cinfo,
+		  JSAMPIMAGE input_buf, JDIMENSION input_row,
+		  JSAMPARRAY output_buf, int num_rows)
+{
+  switch (cinfo->out_color_space) {
+    case JCS_EXT_RGB:
+      gray_extrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
+                                   num_rows);
+      break;
+    case JCS_EXT_RGBX:
+    case JCS_EXT_RGBA:
+      gray_extrgbx_convert_internal(cinfo, input_buf, input_row, output_buf,
+                                    num_rows);
+      break;
+    case JCS_EXT_BGR:
+      gray_extbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
+                                   num_rows);
+      break;
+    case JCS_EXT_BGRX:
+    case JCS_EXT_BGRA:
+      gray_extbgrx_convert_internal(cinfo, input_buf, input_row, output_buf,
+                                    num_rows);
+      break;
+    case JCS_EXT_XBGR:
+    case JCS_EXT_ABGR:
+      gray_extxbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
+                                    num_rows);
+      break;
+    case JCS_EXT_XRGB:
+    case JCS_EXT_ARGB:
+      gray_extxrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
+                                    num_rows);
+      break;
+    default:
+      gray_rgb_convert_internal(cinfo, input_buf, input_row, output_buf,
+                                num_rows);
+      break;
+  }
+}
+
+
+/*
+ * Adobe-style YCCK->CMYK conversion.
+ * We convert YCbCr to R=1-C, G=1-M, and B=1-Y using the same
+ * conversion as above, while passing K (black) unchanged.
+ * We assume build_ycc_rgb_table has been called.
+ */
+
+METHODDEF(void)
+ycck_cmyk_convert (j_decompress_ptr cinfo,
+		   JSAMPIMAGE input_buf, JDIMENSION input_row,
+		   JSAMPARRAY output_buf, int num_rows)
+{
+  my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
+  register int y, cb, cr;
+  register JSAMPROW outptr;
+  register JSAMPROW inptr0, inptr1, inptr2, inptr3;
+  register JDIMENSION col;
+  JDIMENSION num_cols = cinfo->output_width;
+  /* copy these pointers into registers if possible */
+  register JSAMPLE * range_limit = cinfo->sample_range_limit;
+  register int * Crrtab = cconvert->Cr_r_tab;
+  register int * Cbbtab = cconvert->Cb_b_tab;
+  register INT32 * Crgtab = cconvert->Cr_g_tab;
+  register INT32 * Cbgtab = cconvert->Cb_g_tab;
+  SHIFT_TEMPS
+
+  while (--num_rows >= 0) {
+    inptr0 = input_buf[0][input_row];
+    inptr1 = input_buf[1][input_row];
+    inptr2 = input_buf[2][input_row];
+    inptr3 = input_buf[3][input_row];
+    input_row++;
+    outptr = *output_buf++;
+    for (col = 0; col < num_cols; col++) {
+      y  = GETJSAMPLE(inptr0[col]);
+      cb = GETJSAMPLE(inptr1[col]);
+      cr = GETJSAMPLE(inptr2[col]);
+      /* Range-limiting is essential due to noise introduced by DCT losses. */
+      outptr[0] = range_limit[MAXJSAMPLE - (y + Crrtab[cr])];	/* red */
+      outptr[1] = range_limit[MAXJSAMPLE - (y +			/* green */
+			      ((int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
+						 SCALEBITS)))];
+      outptr[2] = range_limit[MAXJSAMPLE - (y + Cbbtab[cb])];	/* blue */
+      /* K passes through unchanged */
+      outptr[3] = inptr3[col];	/* don't need GETJSAMPLE here */
+      outptr += 4;
+    }
+  }
+}
+
+
+/*
+ * Empty method for start_pass.
+ */
+
+METHODDEF(void)
+start_pass_dcolor (j_decompress_ptr cinfo)
+{
+  /* no work needed */
+}
+
+
+/*
+ * Module initialization routine for output colorspace conversion.
+ */
+
+GLOBAL(void)
+jinit_color_deconverter (j_decompress_ptr cinfo)
+{
+  my_cconvert_ptr cconvert;
+  int ci;
+
+  cconvert = (my_cconvert_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				SIZEOF(my_color_deconverter));
+  cinfo->cconvert = (struct jpeg_color_deconverter *) cconvert;
+  cconvert->pub.start_pass = start_pass_dcolor;
+
+  /* Make sure num_components agrees with jpeg_color_space */
+  switch (cinfo->jpeg_color_space) {
+  case JCS_GRAYSCALE:
+    if (cinfo->num_components != 1)
+      ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
+    break;
+
+  case JCS_RGB:
+  case JCS_YCbCr:
+    if (cinfo->num_components != 3)
+      ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
+    break;
+
+  case JCS_CMYK:
+  case JCS_YCCK:
+    if (cinfo->num_components != 4)
+      ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
+    break;
+
+  default:			/* JCS_UNKNOWN can be anything */
+    if (cinfo->num_components < 1)
+      ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
+    break;
+  }
+
+  /* Set out_color_components and conversion method based on requested space.
+   * Also clear the component_needed flags for any unused components,
+   * so that earlier pipeline stages can avoid useless computation.
+   */
+
+  switch (cinfo->out_color_space) {
+  case JCS_GRAYSCALE:
+    cinfo->out_color_components = 1;
+    if (cinfo->jpeg_color_space == JCS_GRAYSCALE ||
+	cinfo->jpeg_color_space == JCS_YCbCr) {
+      cconvert->pub.color_convert = grayscale_convert;
+      /* For color->grayscale conversion, only the Y (0) component is needed */
+      for (ci = 1; ci < cinfo->num_components; ci++)
+	cinfo->comp_info[ci].component_needed = FALSE;
+    } else
+      ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
+    break;
+
+  case JCS_RGB:
+  case JCS_EXT_RGB:
+  case JCS_EXT_RGBX:
+  case JCS_EXT_BGR:
+  case JCS_EXT_BGRX:
+  case JCS_EXT_XBGR:
+  case JCS_EXT_XRGB:
+  case JCS_EXT_RGBA:
+  case JCS_EXT_BGRA:
+  case JCS_EXT_ABGR:
+  case JCS_EXT_ARGB:
+    cinfo->out_color_components = rgb_pixelsize[cinfo->out_color_space];
+    if (cinfo->jpeg_color_space == JCS_YCbCr) {
+      if (jsimd_can_ycc_rgb())
+        cconvert->pub.color_convert = jsimd_ycc_rgb_convert;
+      else {
+        cconvert->pub.color_convert = ycc_rgb_convert;
+        build_ycc_rgb_table(cinfo);
+      }
+    } else if (cinfo->jpeg_color_space == JCS_GRAYSCALE) {
+      cconvert->pub.color_convert = gray_rgb_convert;
+    } else if (cinfo->jpeg_color_space == cinfo->out_color_space &&
+      rgb_pixelsize[cinfo->out_color_space] == 3) {
+      cconvert->pub.color_convert = null_convert;
+    } else
+      ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
+    break;
+
+  case JCS_CMYK:
+    cinfo->out_color_components = 4;
+    if (cinfo->jpeg_color_space == JCS_YCCK) {
+      cconvert->pub.color_convert = ycck_cmyk_convert;
+      build_ycc_rgb_table(cinfo);
+    } else if (cinfo->jpeg_color_space == JCS_CMYK) {
+      cconvert->pub.color_convert = null_convert;
+    } else
+      ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
+    break;
+
+  default:
+    /* Permit null conversion to same output space */
+    if (cinfo->out_color_space == cinfo->jpeg_color_space) {
+      cinfo->out_color_components = cinfo->num_components;
+      cconvert->pub.color_convert = null_convert;
+    } else			/* unsupported non-null conversion */
+      ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
+    break;
+  }
+
+  if (cinfo->quantize_colors)
+    cinfo->output_components = 1; /* single colormapped output component */
+  else
+    cinfo->output_components = cinfo->out_color_components;
+}
diff --git a/src/libjpeg-turbo/jdct.h b/src/libjpeg-turbo/jdct.h
new file mode 100644
index 0000000..7b49a97
--- /dev/null
+++ b/src/libjpeg-turbo/jdct.h
@@ -0,0 +1,184 @@
+/*
+ * jdct.h
+ *
+ * Copyright (C) 1994-1996, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This include file contains common declarations for the forward and
+ * inverse DCT modules.  These declarations are private to the DCT managers
+ * (jcdctmgr.c, jddctmgr.c) and the individual DCT algorithms.
+ * The individual DCT algorithms are kept in separate files to ease 
+ * machine-dependent tuning (e.g., assembly coding).
+ */
+
+
+/*
+ * A forward DCT routine is given a pointer to a work area of type DCTELEM[];
+ * the DCT is to be performed in-place in that buffer.  Type DCTELEM is int
+ * for 8-bit samples, INT32 for 12-bit samples.  (NOTE: Floating-point DCT
+ * implementations use an array of type FAST_FLOAT, instead.)
+ * The DCT inputs are expected to be signed (range +-CENTERJSAMPLE).
+ * The DCT outputs are returned scaled up by a factor of 8; they therefore
+ * have a range of +-8K for 8-bit data, +-128K for 12-bit data.  This
+ * convention improves accuracy in integer implementations and saves some
+ * work in floating-point ones.
+ * Quantization of the output coefficients is done by jcdctmgr.c. This
+ * step requires an unsigned type and also one with twice the bits.
+ */
+
+#if BITS_IN_JSAMPLE == 8
+#ifndef WITH_SIMD
+typedef int DCTELEM;		/* 16 or 32 bits is fine */
+typedef unsigned int UDCTELEM;
+typedef unsigned long long UDCTELEM2;
+#else
+typedef short DCTELEM;  /* prefer 16 bit with SIMD for parellelism */
+typedef unsigned short UDCTELEM;
+typedef unsigned int UDCTELEM2;
+#endif
+#else
+typedef INT32 DCTELEM;		/* must have 32 bits */
+typedef UINT32 UDCTELEM;
+typedef unsigned long long UDCTELEM2;
+#endif
+
+
+/*
+ * An inverse DCT routine is given a pointer to the input JBLOCK and a pointer
+ * to an output sample array.  The routine must dequantize the input data as
+ * well as perform the IDCT; for dequantization, it uses the multiplier table
+ * pointed to by compptr->dct_table.  The output data is to be placed into the
+ * sample array starting at a specified column.  (Any row offset needed will
+ * be applied to the array pointer before it is passed to the IDCT code.)
+ * Note that the number of samples emitted by the IDCT routine is
+ * DCT_scaled_size * DCT_scaled_size.
+ */
+
+/* typedef inverse_DCT_method_ptr is declared in jpegint.h */
+
+/*
+ * Each IDCT routine has its own ideas about the best dct_table element type.
+ */
+
+typedef MULTIPLIER ISLOW_MULT_TYPE; /* short or int, whichever is faster */
+#if BITS_IN_JSAMPLE == 8
+typedef MULTIPLIER IFAST_MULT_TYPE; /* 16 bits is OK, use short if faster */
+#define IFAST_SCALE_BITS  2	/* fractional bits in scale factors */
+#else
+typedef INT32 IFAST_MULT_TYPE;	/* need 32 bits for scaled quantizers */
+#define IFAST_SCALE_BITS  13	/* fractional bits in scale factors */
+#endif
+typedef FAST_FLOAT FLOAT_MULT_TYPE; /* preferred floating type */
+
+
+/*
+ * Each IDCT routine is responsible for range-limiting its results and
+ * converting them to unsigned form (0..MAXJSAMPLE).  The raw outputs could
+ * be quite far out of range if the input data is corrupt, so a bulletproof
+ * range-limiting step is required.  We use a mask-and-table-lookup method
+ * to do the combined operations quickly.  See the comments with
+ * prepare_range_limit_table (in jdmaster.c) for more info.
+ */
+
+#define IDCT_range_limit(cinfo)  ((cinfo)->sample_range_limit + CENTERJSAMPLE)
+
+#define RANGE_MASK  (MAXJSAMPLE * 4 + 3) /* 2 bits wider than legal samples */
+
+
+/* Short forms of external names for systems with brain-damaged linkers. */
+
+#ifdef NEED_SHORT_EXTERNAL_NAMES
+#define jpeg_fdct_islow		jFDislow
+#define jpeg_fdct_ifast		jFDifast
+#define jpeg_fdct_float		jFDfloat
+#define jpeg_idct_islow		jRDislow
+#define jpeg_idct_ifast		jRDifast
+#define jpeg_idct_float		jRDfloat
+#define jpeg_idct_4x4		jRD4x4
+#define jpeg_idct_2x2		jRD2x2
+#define jpeg_idct_1x1		jRD1x1
+#endif /* NEED_SHORT_EXTERNAL_NAMES */
+
+/* Extern declarations for the forward and inverse DCT routines. */
+
+EXTERN(void) jpeg_fdct_islow JPP((DCTELEM * data));
+EXTERN(void) jpeg_fdct_ifast JPP((DCTELEM * data));
+EXTERN(void) jpeg_fdct_float JPP((FAST_FLOAT * data));
+
+EXTERN(void) jpeg_idct_islow
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_ifast
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_float
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_4x4
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_2x2
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_1x1
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+
+
+/*
+ * Macros for handling fixed-point arithmetic; these are used by many
+ * but not all of the DCT/IDCT modules.
+ *
+ * All values are expected to be of type INT32.
+ * Fractional constants are scaled left by CONST_BITS bits.
+ * CONST_BITS is defined within each module using these macros,
+ * and may differ from one module to the next.
+ */
+
+#define ONE	((INT32) 1)
+#define CONST_SCALE (ONE << CONST_BITS)
+
+/* Convert a positive real constant to an integer scaled by CONST_SCALE.
+ * Caution: some C compilers fail to reduce "FIX(constant)" at compile time,
+ * thus causing a lot of useless floating-point operations at run time.
+ */
+
+#define FIX(x)	((INT32) ((x) * CONST_SCALE + 0.5))
+
+/* Descale and correctly round an INT32 value that's scaled by N bits.
+ * We assume RIGHT_SHIFT rounds towards minus infinity, so adding
+ * the fudge factor is correct for either sign of X.
+ */
+
+#define DESCALE(x,n)  RIGHT_SHIFT((x) + (ONE << ((n)-1)), n)
+
+/* Multiply an INT32 variable by an INT32 constant to yield an INT32 result.
+ * This macro is used only when the two inputs will actually be no more than
+ * 16 bits wide, so that a 16x16->32 bit multiply can be used instead of a
+ * full 32x32 multiply.  This provides a useful speedup on many machines.
+ * Unfortunately there is no way to specify a 16x16->32 multiply portably
+ * in C, but some C compilers will do the right thing if you provide the
+ * correct combination of casts.
+ */
+
+#ifdef SHORTxSHORT_32		/* may work if 'int' is 32 bits */
+#define MULTIPLY16C16(var,const)  (((INT16) (var)) * ((INT16) (const)))
+#endif
+#ifdef SHORTxLCONST_32		/* known to work with Microsoft C 6.0 */
+#define MULTIPLY16C16(var,const)  (((INT16) (var)) * ((INT32) (const)))
+#endif
+
+#ifndef MULTIPLY16C16		/* default definition */
+#define MULTIPLY16C16(var,const)  ((var) * (const))
+#endif
+
+/* Same except both inputs are variables. */
+
+#ifdef SHORTxSHORT_32		/* may work if 'int' is 32 bits */
+#define MULTIPLY16V16(var1,var2)  (((INT16) (var1)) * ((INT16) (var2)))
+#endif
+
+#ifndef MULTIPLY16V16		/* default definition */
+#define MULTIPLY16V16(var1,var2)  ((var1) * (var2))
+#endif
diff --git a/src/libjpeg-turbo/jddctmgr.c b/src/libjpeg-turbo/jddctmgr.c
new file mode 100644
index 0000000..044e469
--- /dev/null
+++ b/src/libjpeg-turbo/jddctmgr.c
@@ -0,0 +1,288 @@
+/*
+ * jddctmgr.c
+ *
+ * Copyright (C) 1994-1996, Thomas G. Lane.
+ * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+ * Copyright (C) 2010, D. R. Commander.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains the inverse-DCT management logic.
+ * This code selects a particular IDCT implementation to be used,
+ * and it performs related housekeeping chores.  No code in this file
+ * is executed per IDCT step, only during output pass setup.
+ *
+ * Note that the IDCT routines are responsible for performing coefficient
+ * dequantization as well as the IDCT proper.  This module sets up the
+ * dequantization multiplier table needed by the IDCT routine.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jdct.h"		/* Private declarations for DCT subsystem */
+#include "jsimddct.h"
+#include "jpegcomp.h"
+
+
+/*
+ * The decompressor input side (jdinput.c) saves away the appropriate
+ * quantization table for each component at the start of the first scan
+ * involving that component.  (This is necessary in order to correctly
+ * decode files that reuse Q-table slots.)
+ * When we are ready to make an output pass, the saved Q-table is converted
+ * to a multiplier table that will actually be used by the IDCT routine.
+ * The multiplier table contents are IDCT-method-dependent.  To support
+ * application changes in IDCT method between scans, we can remake the
+ * multiplier tables if necessary.
+ * In buffered-image mode, the first output pass may occur before any data
+ * has been seen for some components, and thus before their Q-tables have
+ * been saved away.  To handle this case, multiplier tables are preset
+ * to zeroes; the result of the IDCT will be a neutral gray level.
+ */
+
+
+/* Private subobject for this module */
+
+typedef struct {
+  struct jpeg_inverse_dct pub;	/* public fields */
+
+  /* This array contains the IDCT method code that each multiplier table
+   * is currently set up for, or -1 if it's not yet set up.
+   * The actual multiplier tables are pointed to by dct_table in the
+   * per-component comp_info structures.
+   */
+  int cur_method[MAX_COMPONENTS];
+} my_idct_controller;
+
+typedef my_idct_controller * my_idct_ptr;
+
+
+/* Allocated multiplier tables: big enough for any supported variant */
+
+typedef union {
+  ISLOW_MULT_TYPE islow_array[DCTSIZE2];
+#ifdef DCT_IFAST_SUPPORTED
+  IFAST_MULT_TYPE ifast_array[DCTSIZE2];
+#endif
+#ifdef DCT_FLOAT_SUPPORTED
+  FLOAT_MULT_TYPE float_array[DCTSIZE2];
+#endif
+} multiplier_table;
+
+
+/* The current scaled-IDCT routines require ISLOW-style multiplier tables,
+ * so be sure to compile that code if either ISLOW or SCALING is requested.
+ */
+#ifdef DCT_ISLOW_SUPPORTED
+#define PROVIDE_ISLOW_TABLES
+#else
+#ifdef IDCT_SCALING_SUPPORTED
+#define PROVIDE_ISLOW_TABLES
+#endif
+#endif
+
+
+/*
+ * Prepare for an output pass.
+ * Here we select the proper IDCT routine for each component and build
+ * a matching multiplier table.
+ */
+
+METHODDEF(void)
+start_pass (j_decompress_ptr cinfo)
+{
+  my_idct_ptr idct = (my_idct_ptr) cinfo->idct;
+  int ci, i;
+  jpeg_component_info *compptr;
+  int method = 0;
+  inverse_DCT_method_ptr method_ptr = NULL;
+  JQUANT_TBL * qtbl;
+
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    /* Select the proper IDCT routine for this component's scaling */
+    switch (compptr->_DCT_scaled_size) {
+#ifdef IDCT_SCALING_SUPPORTED
+    case 1:
+      method_ptr = jpeg_idct_1x1;
+      method = JDCT_ISLOW;	/* jidctred uses islow-style table */
+      break;
+    case 2:
+      if (jsimd_can_idct_2x2())
+        method_ptr = jsimd_idct_2x2;
+      else
+        method_ptr = jpeg_idct_2x2;
+      method = JDCT_ISLOW;	/* jidctred uses islow-style table */
+      break;
+    case 4:
+      if (jsimd_can_idct_4x4())
+        method_ptr = jsimd_idct_4x4;
+      else
+        method_ptr = jpeg_idct_4x4;
+      method = JDCT_ISLOW;	/* jidctred uses islow-style table */
+      break;
+#endif
+    case DCTSIZE:
+      switch (cinfo->dct_method) {
+#ifdef DCT_ISLOW_SUPPORTED
+      case JDCT_ISLOW:
+	if (jsimd_can_idct_islow())
+	  method_ptr = jsimd_idct_islow;
+	else
+	  method_ptr = jpeg_idct_islow;
+	method = JDCT_ISLOW;
+	break;
+#endif
+#ifdef DCT_IFAST_SUPPORTED
+      case JDCT_IFAST:
+	if (jsimd_can_idct_ifast())
+	  method_ptr = jsimd_idct_ifast;
+	else
+	  method_ptr = jpeg_idct_ifast;
+	method = JDCT_IFAST;
+	break;
+#endif
+#ifdef DCT_FLOAT_SUPPORTED
+      case JDCT_FLOAT:
+	if (jsimd_can_idct_float())
+	  method_ptr = jsimd_idct_float;
+	else
+	  method_ptr = jpeg_idct_float;
+	method = JDCT_FLOAT;
+	break;
+#endif
+      default:
+	ERREXIT(cinfo, JERR_NOT_COMPILED);
+	break;
+      }
+      break;
+    default:
+      ERREXIT1(cinfo, JERR_BAD_DCTSIZE, compptr->_DCT_scaled_size);
+      break;
+    }
+    idct->pub.inverse_DCT[ci] = method_ptr;
+    /* Create multiplier table from quant table.
+     * However, we can skip this if the component is uninteresting
+     * or if we already built the table.  Also, if no quant table
+     * has yet been saved for the component, we leave the
+     * multiplier table all-zero; we'll be reading zeroes from the
+     * coefficient controller's buffer anyway.
+     */
+    if (! compptr->component_needed || idct->cur_method[ci] == method)
+      continue;
+    qtbl = compptr->quant_table;
+    if (qtbl == NULL)		/* happens if no data yet for component */
+      continue;
+    idct->cur_method[ci] = method;
+    switch (method) {
+#ifdef PROVIDE_ISLOW_TABLES
+    case JDCT_ISLOW:
+      {
+	/* For LL&M IDCT method, multipliers are equal to raw quantization
+	 * coefficients, but are stored as ints to ensure access efficiency.
+	 */
+	ISLOW_MULT_TYPE * ismtbl = (ISLOW_MULT_TYPE *) compptr->dct_table;
+	for (i = 0; i < DCTSIZE2; i++) {
+	  ismtbl[i] = (ISLOW_MULT_TYPE) qtbl->quantval[i];
+	}
+      }
+      break;
+#endif
+#ifdef DCT_IFAST_SUPPORTED
+    case JDCT_IFAST:
+      {
+	/* For AA&N IDCT method, multipliers are equal to quantization
+	 * coefficients scaled by scalefactor[row]*scalefactor[col], where
+	 *   scalefactor[0] = 1
+	 *   scalefactor[k] = cos(k*PI/16) * sqrt(2)    for k=1..7
+	 * For integer operation, the multiplier table is to be scaled by
+	 * IFAST_SCALE_BITS.
+	 */
+	IFAST_MULT_TYPE * ifmtbl = (IFAST_MULT_TYPE *) compptr->dct_table;
+#define CONST_BITS 14
+	static const INT16 aanscales[DCTSIZE2] = {
+	  /* precomputed values scaled up by 14 bits */
+	  16384, 22725, 21407, 19266, 16384, 12873,  8867,  4520,
+	  22725, 31521, 29692, 26722, 22725, 17855, 12299,  6270,
+	  21407, 29692, 27969, 25172, 21407, 16819, 11585,  5906,
+	  19266, 26722, 25172, 22654, 19266, 15137, 10426,  5315,
+	  16384, 22725, 21407, 19266, 16384, 12873,  8867,  4520,
+	  12873, 17855, 16819, 15137, 12873, 10114,  6967,  3552,
+	   8867, 12299, 11585, 10426,  8867,  6967,  4799,  2446,
+	   4520,  6270,  5906,  5315,  4520,  3552,  2446,  1247
+	};
+	SHIFT_TEMPS
+
+	for (i = 0; i < DCTSIZE2; i++) {
+	  ifmtbl[i] = (IFAST_MULT_TYPE)
+	    DESCALE(MULTIPLY16V16((INT32) qtbl->quantval[i],
+				  (INT32) aanscales[i]),
+		    CONST_BITS-IFAST_SCALE_BITS);
+	}
+      }
+      break;
+#endif
+#ifdef DCT_FLOAT_SUPPORTED
+    case JDCT_FLOAT:
+      {
+	/* For float AA&N IDCT method, multipliers are equal to quantization
+	 * coefficients scaled by scalefactor[row]*scalefactor[col], where
+	 *   scalefactor[0] = 1
+	 *   scalefactor[k] = cos(k*PI/16) * sqrt(2)    for k=1..7
+	 */
+	FLOAT_MULT_TYPE * fmtbl = (FLOAT_MULT_TYPE *) compptr->dct_table;
+	int row, col;
+	static const double aanscalefactor[DCTSIZE] = {
+	  1.0, 1.387039845, 1.306562965, 1.175875602,
+	  1.0, 0.785694958, 0.541196100, 0.275899379
+	};
+
+	i = 0;
+	for (row = 0; row < DCTSIZE; row++) {
+	  for (col = 0; col < DCTSIZE; col++) {
+	    fmtbl[i] = (FLOAT_MULT_TYPE)
+	      ((double) qtbl->quantval[i] *
+	       aanscalefactor[row] * aanscalefactor[col]);
+	    i++;
+	  }
+	}
+      }
+      break;
+#endif
+    default:
+      ERREXIT(cinfo, JERR_NOT_COMPILED);
+      break;
+    }
+  }
+}
+
+
+/*
+ * Initialize IDCT manager.
+ */
+
+GLOBAL(void)
+jinit_inverse_dct (j_decompress_ptr cinfo)
+{
+  my_idct_ptr idct;
+  int ci;
+  jpeg_component_info *compptr;
+
+  idct = (my_idct_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				SIZEOF(my_idct_controller));
+  cinfo->idct = (struct jpeg_inverse_dct *) idct;
+  idct->pub.start_pass = start_pass;
+
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    /* Allocate and pre-zero a multiplier table for each component */
+    compptr->dct_table =
+      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				  SIZEOF(multiplier_table));
+    MEMZERO(compptr->dct_table, SIZEOF(multiplier_table));
+    /* Mark multiplier table not yet set up for any method */
+    idct->cur_method[ci] = -1;
+  }
+}
diff --git a/src/libjpeg-turbo/jdhuff.c b/src/libjpeg-turbo/jdhuff.c
new file mode 100644
index 0000000..f822dba
--- /dev/null
+++ b/src/libjpeg-turbo/jdhuff.c
@@ -0,0 +1,808 @@
+/*
+ * jdhuff.c
+ *
+ * Copyright (C) 1991-1997, Thomas G. Lane.
+ * Copyright (C) 2009-2011, D. R. Commander.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains Huffman entropy decoding routines.
+ *
+ * Much of the complexity here has to do with supporting input suspension.
+ * If the data source module demands suspension, we want to be able to back
+ * up to the start of the current MCU.  To do this, we copy state variables
+ * into local working storage, and update them back to the permanent
+ * storage only upon successful completion of an MCU.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jdhuff.h"		/* Declarations shared with jdphuff.c */
+#include "jpegcomp.h"
+
+
+/*
+ * Expanded entropy decoder object for Huffman decoding.
+ *
+ * The savable_state subrecord contains fields that change within an MCU,
+ * but must not be updated permanently until we complete the MCU.
+ */
+
+typedef struct {
+  int last_dc_val[MAX_COMPS_IN_SCAN]; /* last DC coef for each component */
+} savable_state;
+
+/* This macro is to work around compilers with missing or broken
+ * structure assignment.  You'll need to fix this code if you have
+ * such a compiler and you change MAX_COMPS_IN_SCAN.
+ */
+
+#ifndef NO_STRUCT_ASSIGN
+#define ASSIGN_STATE(dest,src)  ((dest) = (src))
+#else
+#if MAX_COMPS_IN_SCAN == 4
+#define ASSIGN_STATE(dest,src)  \
+	((dest).last_dc_val[0] = (src).last_dc_val[0], \
+	 (dest).last_dc_val[1] = (src).last_dc_val[1], \
+	 (dest).last_dc_val[2] = (src).last_dc_val[2], \
+	 (dest).last_dc_val[3] = (src).last_dc_val[3])
+#endif
+#endif
+
+
+typedef struct {
+  struct jpeg_entropy_decoder pub; /* public fields */
+
+  /* These fields are loaded into local variables at start of each MCU.
+   * In case of suspension, we exit WITHOUT updating them.
+   */
+  bitread_perm_state bitstate;	/* Bit buffer at start of MCU */
+  savable_state saved;		/* Other state at start of MCU */
+
+  /* These fields are NOT loaded into local working state. */
+  unsigned int restarts_to_go;	/* MCUs left in this restart interval */
+
+  /* Pointers to derived tables (these workspaces have image lifespan) */
+  d_derived_tbl * dc_derived_tbls[NUM_HUFF_TBLS];
+  d_derived_tbl * ac_derived_tbls[NUM_HUFF_TBLS];
+
+  /* Precalculated info set up by start_pass for use in decode_mcu: */
+
+  /* Pointers to derived tables to be used for each block within an MCU */
+  d_derived_tbl * dc_cur_tbls[D_MAX_BLOCKS_IN_MCU];
+  d_derived_tbl * ac_cur_tbls[D_MAX_BLOCKS_IN_MCU];
+  /* Whether we care about the DC and AC coefficient values for each block */
+  boolean dc_needed[D_MAX_BLOCKS_IN_MCU];
+  boolean ac_needed[D_MAX_BLOCKS_IN_MCU];
+} huff_entropy_decoder;
+
+typedef huff_entropy_decoder * huff_entropy_ptr;
+
+
+/*
+ * Initialize for a Huffman-compressed scan.
+ */
+
+METHODDEF(void)
+start_pass_huff_decoder (j_decompress_ptr cinfo)
+{
+  huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy;
+  int ci, blkn, dctbl, actbl;
+  jpeg_component_info * compptr;
+
+  /* Check that the scan parameters Ss, Se, Ah/Al are OK for sequential JPEG.
+   * This ought to be an error condition, but we make it a warning because
+   * there are some baseline files out there with all zeroes in these bytes.
+   */
+  if (cinfo->Ss != 0 || cinfo->Se != DCTSIZE2-1 ||
+      cinfo->Ah != 0 || cinfo->Al != 0)
+    WARNMS(cinfo, JWRN_NOT_SEQUENTIAL);
+
+  for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
+    compptr = cinfo->cur_comp_info[ci];
+    dctbl = compptr->dc_tbl_no;
+    actbl = compptr->ac_tbl_no;
+    /* Compute derived values for Huffman tables */
+    /* We may do this more than once for a table, but it's not expensive */
+    jpeg_make_d_derived_tbl(cinfo, TRUE, dctbl,
+			    & entropy->dc_derived_tbls[dctbl]);
+    jpeg_make_d_derived_tbl(cinfo, FALSE, actbl,
+			    & entropy->ac_derived_tbls[actbl]);
+    /* Initialize DC predictions to 0 */
+    entropy->saved.last_dc_val[ci] = 0;
+  }
+
+  /* Precalculate decoding info for each block in an MCU of this scan */
+  for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
+    ci = cinfo->MCU_membership[blkn];
+    compptr = cinfo->cur_comp_info[ci];
+    /* Precalculate which table to use for each block */
+    entropy->dc_cur_tbls[blkn] = entropy->dc_derived_tbls[compptr->dc_tbl_no];
+    entropy->ac_cur_tbls[blkn] = entropy->ac_derived_tbls[compptr->ac_tbl_no];
+    /* Decide whether we really care about the coefficient values */
+    if (compptr->component_needed) {
+      entropy->dc_needed[blkn] = TRUE;
+      /* we don't need the ACs if producing a 1/8th-size image */
+      entropy->ac_needed[blkn] = (compptr->_DCT_scaled_size > 1);
+    } else {
+      entropy->dc_needed[blkn] = entropy->ac_needed[blkn] = FALSE;
+    }
+  }
+
+  /* Initialize bitread state variables */
+  entropy->bitstate.bits_left = 0;
+  entropy->bitstate.get_buffer = 0; /* unnecessary, but keeps Purify quiet */
+  entropy->pub.insufficient_data = FALSE;
+
+  /* Initialize restart counter */
+  entropy->restarts_to_go = cinfo->restart_interval;
+}
+
+
+/*
+ * Compute the derived values for a Huffman table.
+ * This routine also performs some validation checks on the table.
+ *
+ * Note this is also used by jdphuff.c.
+ */
+
+GLOBAL(void)
+jpeg_make_d_derived_tbl (j_decompress_ptr cinfo, boolean isDC, int tblno,
+			 d_derived_tbl ** pdtbl)
+{
+  JHUFF_TBL *htbl;
+  d_derived_tbl *dtbl;
+  int p, i, l, si, numsymbols;
+  int lookbits, ctr;
+  char huffsize[257];
+  unsigned int huffcode[257];
+  unsigned int code;
+
+  /* Note that huffsize[] and huffcode[] are filled in code-length order,
+   * paralleling the order of the symbols themselves in htbl->huffval[].
+   */
+
+  /* Find the input Huffman table */
+  if (tblno < 0 || tblno >= NUM_HUFF_TBLS)
+    ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, tblno);
+  htbl =
+    isDC ? cinfo->dc_huff_tbl_ptrs[tblno] : cinfo->ac_huff_tbl_ptrs[tblno];
+  if (htbl == NULL)
+    ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, tblno);
+
+  /* Allocate a workspace if we haven't already done so. */
+  if (*pdtbl == NULL)
+    *pdtbl = (d_derived_tbl *)
+      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				  SIZEOF(d_derived_tbl));
+  dtbl = *pdtbl;
+  dtbl->pub = htbl;		/* fill in back link */
+  
+  /* Figure C.1: make table of Huffman code length for each symbol */
+
+  p = 0;
+  for (l = 1; l <= 16; l++) {
+    i = (int) htbl->bits[l];
+    if (i < 0 || p + i > 256)	/* protect against table overrun */
+      ERREXIT(cinfo, JERR_BAD_HUFF_TABLE);
+    while (i--)
+      huffsize[p++] = (char) l;
+  }
+  huffsize[p] = 0;
+  numsymbols = p;
+  
+  /* Figure C.2: generate the codes themselves */
+  /* We also validate that the counts represent a legal Huffman code tree. */
+  
+  code = 0;
+  si = huffsize[0];
+  p = 0;
+  while (huffsize[p]) {
+    while (((int) huffsize[p]) == si) {
+      huffcode[p++] = code;
+      code++;
+    }
+    /* code is now 1 more than the last code used for codelength si; but
+     * it must still fit in si bits, since no code is allowed to be all ones.
+     */
+    if (((INT32) code) >= (((INT32) 1) << si))
+      ERREXIT(cinfo, JERR_BAD_HUFF_TABLE);
+    code <<= 1;
+    si++;
+  }
+
+  /* Figure F.15: generate decoding tables for bit-sequential decoding */
+
+  p = 0;
+  for (l = 1; l <= 16; l++) {
+    if (htbl->bits[l]) {
+      /* valoffset[l] = huffval[] index of 1st symbol of code length l,
+       * minus the minimum code of length l
+       */
+      dtbl->valoffset[l] = (INT32) p - (INT32) huffcode[p];
+      p += htbl->bits[l];
+      dtbl->maxcode[l] = huffcode[p-1]; /* maximum code of length l */
+    } else {
+      dtbl->maxcode[l] = -1;	/* -1 if no codes of this length */
+    }
+  }
+  dtbl->valoffset[17] = 0;
+  dtbl->maxcode[17] = 0xFFFFFL; /* ensures jpeg_huff_decode terminates */
+
+  /* Compute lookahead tables to speed up decoding.
+   * First we set all the table entries to 0, indicating "too long";
+   * then we iterate through the Huffman codes that are short enough and
+   * fill in all the entries that correspond to bit sequences starting
+   * with that code.
+   */
+
+   for (i = 0; i < (1 << HUFF_LOOKAHEAD); i++)
+     dtbl->lookup[i] = (HUFF_LOOKAHEAD + 1) << HUFF_LOOKAHEAD;
+
+  p = 0;
+  for (l = 1; l <= HUFF_LOOKAHEAD; l++) {
+    for (i = 1; i <= (int) htbl->bits[l]; i++, p++) {
+      /* l = current code's length, p = its index in huffcode[] & huffval[]. */
+      /* Generate left-justified code followed by all possible bit sequences */
+      lookbits = huffcode[p] << (HUFF_LOOKAHEAD-l);
+      for (ctr = 1 << (HUFF_LOOKAHEAD-l); ctr > 0; ctr--) {
+	dtbl->lookup[lookbits] = (l << HUFF_LOOKAHEAD) | htbl->huffval[p];
+	lookbits++;
+      }
+    }
+  }
+
+  /* Validate symbols as being reasonable.
+   * For AC tables, we make no check, but accept all byte values 0..255.
+   * For DC tables, we require the symbols to be in range 0..15.
+   * (Tighter bounds could be applied depending on the data depth and mode,
+   * but this is sufficient to ensure safe decoding.)
+   */
+  if (isDC) {
+    for (i = 0; i < numsymbols; i++) {
+      int sym = htbl->huffval[i];
+      if (sym < 0 || sym > 15)
+	ERREXIT(cinfo, JERR_BAD_HUFF_TABLE);
+    }
+  }
+}
+
+
+/*
+ * Out-of-line code for bit fetching (shared with jdphuff.c).
+ * See jdhuff.h for info about usage.
+ * Note: current values of get_buffer and bits_left are passed as parameters,
+ * but are returned in the corresponding fields of the state struct.
+ *
+ * On most machines MIN_GET_BITS should be 25 to allow the full 32-bit width
+ * of get_buffer to be used.  (On machines with wider words, an even larger
+ * buffer could be used.)  However, on some machines 32-bit shifts are
+ * quite slow and take time proportional to the number of places shifted.
+ * (This is true with most PC compilers, for instance.)  In this case it may
+ * be a win to set MIN_GET_BITS to the minimum value of 15.  This reduces the
+ * average shift distance at the cost of more calls to jpeg_fill_bit_buffer.
+ */
+
+#ifdef SLOW_SHIFT_32
+#define MIN_GET_BITS  15	/* minimum allowable value */
+#else
+#define MIN_GET_BITS  (BIT_BUF_SIZE-7)
+#endif
+
+
+GLOBAL(boolean)
+jpeg_fill_bit_buffer (bitread_working_state * state,
+		      register bit_buf_type get_buffer, register int bits_left,
+		      int nbits)
+/* Load up the bit buffer to a depth of at least nbits */
+{
+  /* Copy heavily used state fields into locals (hopefully registers) */
+  register const JOCTET * next_input_byte = state->next_input_byte;
+  register size_t bytes_in_buffer = state->bytes_in_buffer;
+  j_decompress_ptr cinfo = state->cinfo;
+
+  /* Attempt to load at least MIN_GET_BITS bits into get_buffer. */
+  /* (It is assumed that no request will be for more than that many bits.) */
+  /* We fail to do so only if we hit a marker or are forced to suspend. */
+
+  if (cinfo->unread_marker == 0) {	/* cannot advance past a marker */
+    while (bits_left < MIN_GET_BITS) {
+      register int c;
+
+      /* Attempt to read a byte */
+      if (bytes_in_buffer == 0) {
+	if (! (*cinfo->src->fill_input_buffer) (cinfo))
+	  return FALSE;
+	next_input_byte = cinfo->src->next_input_byte;
+	bytes_in_buffer = cinfo->src->bytes_in_buffer;
+      }
+      bytes_in_buffer--;
+      c = GETJOCTET(*next_input_byte++);
+
+      /* If it's 0xFF, check and discard stuffed zero byte */
+      if (c == 0xFF) {
+	/* Loop here to discard any padding FF's on terminating marker,
+	 * so that we can save a valid unread_marker value.  NOTE: we will
+	 * accept multiple FF's followed by a 0 as meaning a single FF data
+	 * byte.  This data pattern is not valid according to the standard.
+	 */
+	do {
+	  if (bytes_in_buffer == 0) {
+	    if (! (*cinfo->src->fill_input_buffer) (cinfo))
+	      return FALSE;
+	    next_input_byte = cinfo->src->next_input_byte;
+	    bytes_in_buffer = cinfo->src->bytes_in_buffer;
+	  }
+	  bytes_in_buffer--;
+	  c = GETJOCTET(*next_input_byte++);
+	} while (c == 0xFF);
+
+	if (c == 0) {
+	  /* Found FF/00, which represents an FF data byte */
+	  c = 0xFF;
+	} else {
+	  /* Oops, it's actually a marker indicating end of compressed data.
+	   * Save the marker code for later use.
+	   * Fine point: it might appear that we should save the marker into
+	   * bitread working state, not straight into permanent state.  But
+	   * once we have hit a marker, we cannot need to suspend within the
+	   * current MCU, because we will read no more bytes from the data
+	   * source.  So it is OK to update permanent state right away.
+	   */
+	  cinfo->unread_marker = c;
+	  /* See if we need to insert some fake zero bits. */
+	  goto no_more_bytes;
+	}
+      }
+
+      /* OK, load c into get_buffer */
+      get_buffer = (get_buffer << 8) | c;
+      bits_left += 8;
+    } /* end while */
+  } else {
+  no_more_bytes:
+    /* We get here if we've read the marker that terminates the compressed
+     * data segment.  There should be enough bits in the buffer register
+     * to satisfy the request; if so, no problem.
+     */
+    if (nbits > bits_left) {
+      /* Uh-oh.  Report corrupted data to user and stuff zeroes into
+       * the data stream, so that we can produce some kind of image.
+       * We use a nonvolatile flag to ensure that only one warning message
+       * appears per data segment.
+       */
+      if (! cinfo->entropy->insufficient_data) {
+	WARNMS(cinfo, JWRN_HIT_MARKER);
+	cinfo->entropy->insufficient_data = TRUE;
+      }
+      /* Fill the buffer with zero bits */
+      get_buffer <<= MIN_GET_BITS - bits_left;
+      bits_left = MIN_GET_BITS;
+    }
+  }
+
+  /* Unload the local registers */
+  state->next_input_byte = next_input_byte;
+  state->bytes_in_buffer = bytes_in_buffer;
+  state->get_buffer = get_buffer;
+  state->bits_left = bits_left;
+
+  return TRUE;
+}
+
+
+/* Macro version of the above, which performs much better but does not
+   handle markers.  We have to hand off any blocks with markers to the
+   slower routines. */
+
+#define GET_BYTE \
+{ \
+  register int c0, c1; \
+  c0 = GETJOCTET(*buffer++); \
+  c1 = GETJOCTET(*buffer); \
+  /* Pre-execute most common case */ \
+  get_buffer = (get_buffer << 8) | c0; \
+  bits_left += 8; \
+  if (c0 == 0xFF) { \
+    /* Pre-execute case of FF/00, which represents an FF data byte */ \
+    buffer++; \
+    if (c1 != 0) { \
+      /* Oops, it's actually a marker indicating end of compressed data. */ \
+      cinfo->unread_marker = c1; \
+      /* Back out pre-execution and fill the buffer with zero bits */ \
+      buffer -= 2; \
+      get_buffer &= ~0xFF; \
+    } \
+  } \
+}
+
+#if __WORDSIZE == 64 || defined(_WIN64)
+
+/* Pre-fetch 48 bytes, because the holding register is 64-bit */
+#define FILL_BIT_BUFFER_FAST \
+  if (bits_left < 16) { \
+    GET_BYTE GET_BYTE GET_BYTE GET_BYTE GET_BYTE GET_BYTE \
+  }
+
+#else
+
+/* Pre-fetch 16 bytes, because the holding register is 32-bit */
+#define FILL_BIT_BUFFER_FAST \
+  if (bits_left < 16) { \
+    GET_BYTE GET_BYTE \
+  }
+
+#endif
+
+
+/*
+ * Out-of-line code for Huffman code decoding.
+ * See jdhuff.h for info about usage.
+ */
+
+GLOBAL(int)
+jpeg_huff_decode (bitread_working_state * state,
+		  register bit_buf_type get_buffer, register int bits_left,
+		  d_derived_tbl * htbl, int min_bits)
+{
+  register int l = min_bits;
+  register INT32 code;
+
+  /* HUFF_DECODE has determined that the code is at least min_bits */
+  /* bits long, so fetch that many bits in one swoop. */
+
+  CHECK_BIT_BUFFER(*state, l, return -1);
+  code = GET_BITS(l);
+
+  /* Collect the rest of the Huffman code one bit at a time. */
+  /* This is per Figure F.16 in the JPEG spec. */
+
+  while (code > htbl->maxcode[l]) {
+    code <<= 1;
+    CHECK_BIT_BUFFER(*state, 1, return -1);
+    code |= GET_BITS(1);
+    l++;
+  }
+
+  /* Unload the local registers */
+  state->get_buffer = get_buffer;
+  state->bits_left = bits_left;
+
+  /* With garbage input we may reach the sentinel value l = 17. */
+
+  if (l > 16) {
+    WARNMS(state->cinfo, JWRN_HUFF_BAD_CODE);
+    return 0;			/* fake a zero as the safest result */
+  }
+
+  return htbl->pub->huffval[ (int) (code + htbl->valoffset[l]) ];
+}
+
+
+/*
+ * Figure F.12: extend sign bit.
+ * On some machines, a shift and add will be faster than a table lookup.
+ */
+
+#define AVOID_TABLES
+#ifdef AVOID_TABLES
+
+#define HUFF_EXTEND(x,s)  ((x) + ((((x) - (1<<((s)-1))) >> 31) & (((-1)<<(s)) + 1)))
+
+#else
+
+#define HUFF_EXTEND(x,s)  ((x) < extend_test[s] ? (x) + extend_offset[s] : (x))
+
+static const int extend_test[16] =   /* entry n is 2**(n-1) */
+  { 0, 0x0001, 0x0002, 0x0004, 0x0008, 0x0010, 0x0020, 0x0040, 0x0080,
+    0x0100, 0x0200, 0x0400, 0x0800, 0x1000, 0x2000, 0x4000 };
+
+static const int extend_offset[16] = /* entry n is (-1 << n) + 1 */
+  { 0, ((-1)<<1) + 1, ((-1)<<2) + 1, ((-1)<<3) + 1, ((-1)<<4) + 1,
+    ((-1)<<5) + 1, ((-1)<<6) + 1, ((-1)<<7) + 1, ((-1)<<8) + 1,
+    ((-1)<<9) + 1, ((-1)<<10) + 1, ((-1)<<11) + 1, ((-1)<<12) + 1,
+    ((-1)<<13) + 1, ((-1)<<14) + 1, ((-1)<<15) + 1 };
+
+#endif /* AVOID_TABLES */
+
+
+/*
+ * Check for a restart marker & resynchronize decoder.
+ * Returns FALSE if must suspend.
+ */
+
+LOCAL(boolean)
+process_restart (j_decompress_ptr cinfo)
+{
+  huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy;
+  int ci;
+
+  /* Throw away any unused bits remaining in bit buffer; */
+  /* include any full bytes in next_marker's count of discarded bytes */
+  cinfo->marker->discarded_bytes += entropy->bitstate.bits_left / 8;
+  entropy->bitstate.bits_left = 0;
+
+  /* Advance past the RSTn marker */
+  if (! (*cinfo->marker->read_restart_marker) (cinfo))
+    return FALSE;
+
+  /* Re-initialize DC predictions to 0 */
+  for (ci = 0; ci < cinfo->comps_in_scan; ci++)
+    entropy->saved.last_dc_val[ci] = 0;
+
+  /* Reset restart counter */
+  entropy->restarts_to_go = cinfo->restart_interval;
+
+  /* Reset out-of-data flag, unless read_restart_marker left us smack up
+   * against a marker.  In that case we will end up treating the next data
+   * segment as empty, and we can avoid producing bogus output pixels by
+   * leaving the flag set.
+   */
+  if (cinfo->unread_marker == 0)
+    entropy->pub.insufficient_data = FALSE;
+
+  return TRUE;
+}
+
+
+LOCAL(boolean)
+decode_mcu_slow (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
+{
+  huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy;
+  BITREAD_STATE_VARS;
+  int blkn;
+  savable_state state;
+  /* Outer loop handles each block in the MCU */
+
+  /* Load up working state */
+  BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
+  ASSIGN_STATE(state, entropy->saved);
+
+  for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
+    JBLOCKROW block = MCU_data[blkn];
+    d_derived_tbl * dctbl = entropy->dc_cur_tbls[blkn];
+    d_derived_tbl * actbl = entropy->ac_cur_tbls[blkn];
+    register int s, k, r;
+
+    /* Decode a single block's worth of coefficients */
+
+    /* Section F.2.2.1: decode the DC coefficient difference */
+    HUFF_DECODE(s, br_state, dctbl, return FALSE, label1);
+    if (s) {
+      CHECK_BIT_BUFFER(br_state, s, return FALSE);
+      r = GET_BITS(s);
+      s = HUFF_EXTEND(r, s);
+    }
+
+    if (entropy->dc_needed[blkn]) {
+      /* Convert DC difference to actual value, update last_dc_val */
+      int ci = cinfo->MCU_membership[blkn];
+      s += state.last_dc_val[ci];
+      state.last_dc_val[ci] = s;
+      /* Output the DC coefficient (assumes jpeg_natural_order[0] = 0) */
+      (*block)[0] = (JCOEF) s;
+    }
+
+    if (entropy->ac_needed[blkn]) {
+
+      /* Section F.2.2.2: decode the AC coefficients */
+      /* Since zeroes are skipped, output area must be cleared beforehand */
+      for (k = 1; k < DCTSIZE2; k++) {
+        HUFF_DECODE(s, br_state, actbl, return FALSE, label2);
+
+        r = s >> 4;
+        s &= 15;
+      
+        if (s) {
+          k += r;
+          CHECK_BIT_BUFFER(br_state, s, return FALSE);
+          r = GET_BITS(s);
+          s = HUFF_EXTEND(r, s);
+          /* Output coefficient in natural (dezigzagged) order.
+           * Note: the extra entries in jpeg_natural_order[] will save us
+           * if k >= DCTSIZE2, which could happen if the data is corrupted.
+           */
+          (*block)[jpeg_natural_order[k]] = (JCOEF) s;
+        } else {
+          if (r != 15)
+            break;
+          k += 15;
+        }
+      }
+
+    } else {
+
+      /* Section F.2.2.2: decode the AC coefficients */
+      /* In this path we just discard the values */
+      for (k = 1; k < DCTSIZE2; k++) {
+        HUFF_DECODE(s, br_state, actbl, return FALSE, label3);
+
+        r = s >> 4;
+        s &= 15;
+
+        if (s) {
+          k += r;
+          CHECK_BIT_BUFFER(br_state, s, return FALSE);
+          DROP_BITS(s);
+        } else {
+          if (r != 15)
+            break;
+          k += 15;
+        }
+      }
+    }
+  }
+
+  /* Completed MCU, so update state */
+  BITREAD_SAVE_STATE(cinfo,entropy->bitstate);
+  ASSIGN_STATE(entropy->saved, state);
+  return TRUE;
+}
+
+
+LOCAL(boolean)
+decode_mcu_fast (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
+{
+  huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy;
+  BITREAD_STATE_VARS;
+  JOCTET *buffer;
+  int blkn;
+  savable_state state;
+  /* Outer loop handles each block in the MCU */
+
+  /* Load up working state */
+  BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
+  buffer = (JOCTET *) br_state.next_input_byte;
+  ASSIGN_STATE(state, entropy->saved);
+
+  for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
+    JBLOCKROW block = MCU_data[blkn];
+    d_derived_tbl * dctbl = entropy->dc_cur_tbls[blkn];
+    d_derived_tbl * actbl = entropy->ac_cur_tbls[blkn];
+    register int s, k, r, l;
+
+    HUFF_DECODE_FAST(s, l, dctbl);
+    if (s) {
+      FILL_BIT_BUFFER_FAST
+      r = GET_BITS(s);
+      s = HUFF_EXTEND(r, s);
+    }
+
+    if (entropy->dc_needed[blkn]) {
+      int ci = cinfo->MCU_membership[blkn];
+      s += state.last_dc_val[ci];
+      state.last_dc_val[ci] = s;
+      (*block)[0] = (JCOEF) s;
+    }
+
+    if (entropy->ac_needed[blkn]) {
+
+      for (k = 1; k < DCTSIZE2; k++) {
+        HUFF_DECODE_FAST(s, l, actbl);
+        r = s >> 4;
+        s &= 15;
+      
+        if (s) {
+          k += r;
+          FILL_BIT_BUFFER_FAST
+          r = GET_BITS(s);
+          s = HUFF_EXTEND(r, s);
+          (*block)[jpeg_natural_order[k]] = (JCOEF) s;
+        } else {
+          if (r != 15) break;
+          k += 15;
+        }
+      }
+
+    } else {
+
+      for (k = 1; k < DCTSIZE2; k++) {
+        HUFF_DECODE_FAST(s, l, actbl);
+        r = s >> 4;
+        s &= 15;
+
+        if (s) {
+          k += r;
+          FILL_BIT_BUFFER_FAST
+          DROP_BITS(s);
+        } else {
+          if (r != 15) break;
+          k += 15;
+        }
+      }
+    }
+  }
+
+  if (cinfo->unread_marker != 0) {
+    cinfo->unread_marker = 0;
+    return FALSE;
+  }
+
+  br_state.bytes_in_buffer -= (buffer - br_state.next_input_byte);
+  br_state.next_input_byte = buffer;
+  BITREAD_SAVE_STATE(cinfo,entropy->bitstate);
+  ASSIGN_STATE(entropy->saved, state);
+  return TRUE;
+}
+
+
+/*
+ * Decode and return one MCU's worth of Huffman-compressed coefficients.
+ * The coefficients are reordered from zigzag order into natural array order,
+ * but are not dequantized.
+ *
+ * The i'th block of the MCU is stored into the block pointed to by
+ * MCU_data[i].  WE ASSUME THIS AREA HAS BEEN ZEROED BY THE CALLER.
+ * (Wholesale zeroing is usually a little faster than retail...)
+ *
+ * Returns FALSE if data source requested suspension.  In that case no
+ * changes have been made to permanent state.  (Exception: some output
+ * coefficients may already have been assigned.  This is harmless for
+ * this module, since we'll just re-assign them on the next call.)
+ */
+
+#define BUFSIZE (DCTSIZE2 * 2)
+
+METHODDEF(boolean)
+decode_mcu (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
+{
+  huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy;
+  int usefast = 1;
+
+  /* Process restart marker if needed; may have to suspend */
+  if (cinfo->restart_interval) {
+    if (entropy->restarts_to_go == 0)
+      if (! process_restart(cinfo))
+	return FALSE;
+    usefast = 0;
+  }
+
+  if (cinfo->src->bytes_in_buffer < BUFSIZE * (size_t)cinfo->blocks_in_MCU
+    || cinfo->unread_marker != 0)
+    usefast = 0;
+
+  /* If we've run out of data, just leave the MCU set to zeroes.
+   * This way, we return uniform gray for the remainder of the segment.
+   */
+  if (! entropy->pub.insufficient_data) {
+
+    if (usefast) {
+      if (!decode_mcu_fast(cinfo, MCU_data)) goto use_slow;
+    }
+    else {
+      use_slow:
+      if (!decode_mcu_slow(cinfo, MCU_data)) return FALSE;
+    }
+
+  }
+
+  /* Account for restart interval (no-op if not using restarts) */
+  entropy->restarts_to_go--;
+
+  return TRUE;
+}
+
+
+/*
+ * Module initialization routine for Huffman entropy decoding.
+ */
+
+GLOBAL(void)
+jinit_huff_decoder (j_decompress_ptr cinfo)
+{
+  huff_entropy_ptr entropy;
+  int i;
+
+  entropy = (huff_entropy_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				SIZEOF(huff_entropy_decoder));
+  cinfo->entropy = (struct jpeg_entropy_decoder *) entropy;
+  entropy->pub.start_pass = start_pass_huff_decoder;
+  entropy->pub.decode_mcu = decode_mcu;
+
+  /* Mark tables unallocated */
+  for (i = 0; i < NUM_HUFF_TBLS; i++) {
+    entropy->dc_derived_tbls[i] = entropy->ac_derived_tbls[i] = NULL;
+  }
+}
diff --git a/src/libjpeg-turbo/jdhuff.h b/src/libjpeg-turbo/jdhuff.h
new file mode 100644
index 0000000..96f2dab
--- /dev/null
+++ b/src/libjpeg-turbo/jdhuff.h
@@ -0,0 +1,234 @@
+/*
+ * jdhuff.h
+ *
+ * Copyright (C) 1991-1997, Thomas G. Lane.
+ * Copyright (C) 2010-2011, D. R. Commander.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains declarations for Huffman entropy decoding routines
+ * that are shared between the sequential decoder (jdhuff.c) and the
+ * progressive decoder (jdphuff.c).  No other modules need to see these.
+ */
+
+/* Short forms of external names for systems with brain-damaged linkers. */
+
+#ifdef NEED_SHORT_EXTERNAL_NAMES
+#define jpeg_make_d_derived_tbl	jMkDDerived
+#define jpeg_fill_bit_buffer	jFilBitBuf
+#define jpeg_huff_decode	jHufDecode
+#endif /* NEED_SHORT_EXTERNAL_NAMES */
+
+
+/* Derived data constructed for each Huffman table */
+
+#define HUFF_LOOKAHEAD	8	/* # of bits of lookahead */
+
+typedef struct {
+  /* Basic tables: (element [0] of each array is unused) */
+  INT32 maxcode[18];		/* largest code of length k (-1 if none) */
+  /* (maxcode[17] is a sentinel to ensure jpeg_huff_decode terminates) */
+  INT32 valoffset[18];		/* huffval[] offset for codes of length k */
+  /* valoffset[k] = huffval[] index of 1st symbol of code length k, less
+   * the smallest code of length k; so given a code of length k, the
+   * corresponding symbol is huffval[code + valoffset[k]]
+   */
+
+  /* Link to public Huffman table (needed only in jpeg_huff_decode) */
+  JHUFF_TBL *pub;
+
+  /* Lookahead table: indexed by the next HUFF_LOOKAHEAD bits of
+   * the input data stream.  If the next Huffman code is no more
+   * than HUFF_LOOKAHEAD bits long, we can obtain its length and
+   * the corresponding symbol directly from this tables.
+   *
+   * The lower 8 bits of each table entry contain the number of
+   * bits in the corresponding Huffman code, or HUFF_LOOKAHEAD + 1
+   * if too long.  The next 8 bits of each entry contain the
+   * symbol.
+   */
+  int lookup[1<<HUFF_LOOKAHEAD];
+} d_derived_tbl;
+
+/* Expand a Huffman table definition into the derived format */
+EXTERN(void) jpeg_make_d_derived_tbl
+	JPP((j_decompress_ptr cinfo, boolean isDC, int tblno,
+	     d_derived_tbl ** pdtbl));
+
+
+/*
+ * Fetching the next N bits from the input stream is a time-critical operation
+ * for the Huffman decoders.  We implement it with a combination of inline
+ * macros and out-of-line subroutines.  Note that N (the number of bits
+ * demanded at one time) never exceeds 15 for JPEG use.
+ *
+ * We read source bytes into get_buffer and dole out bits as needed.
+ * If get_buffer already contains enough bits, they are fetched in-line
+ * by the macros CHECK_BIT_BUFFER and GET_BITS.  When there aren't enough
+ * bits, jpeg_fill_bit_buffer is called; it will attempt to fill get_buffer
+ * as full as possible (not just to the number of bits needed; this
+ * prefetching reduces the overhead cost of calling jpeg_fill_bit_buffer).
+ * Note that jpeg_fill_bit_buffer may return FALSE to indicate suspension.
+ * On TRUE return, jpeg_fill_bit_buffer guarantees that get_buffer contains
+ * at least the requested number of bits --- dummy zeroes are inserted if
+ * necessary.
+ */
+
+#if __WORDSIZE == 64 || defined(_WIN64)
+
+typedef size_t bit_buf_type;	/* type of bit-extraction buffer */
+#define BIT_BUF_SIZE  64		/* size of buffer in bits */
+
+#else
+
+typedef INT32 bit_buf_type;	/* type of bit-extraction buffer */
+#define BIT_BUF_SIZE  32		/* size of buffer in bits */
+
+#endif
+
+/* If long is > 32 bits on your machine, and shifting/masking longs is
+ * reasonably fast, making bit_buf_type be long and setting BIT_BUF_SIZE
+ * appropriately should be a win.  Unfortunately we can't define the size
+ * with something like  #define BIT_BUF_SIZE (sizeof(bit_buf_type)*8)
+ * because not all machines measure sizeof in 8-bit bytes.
+ */
+
+typedef struct {		/* Bitreading state saved across MCUs */
+  bit_buf_type get_buffer;	/* current bit-extraction buffer */
+  int bits_left;		/* # of unused bits in it */
+} bitread_perm_state;
+
+typedef struct {		/* Bitreading working state within an MCU */
+  /* Current data source location */
+  /* We need a copy, rather than munging the original, in case of suspension */
+  const JOCTET * next_input_byte; /* => next byte to read from source */
+  size_t bytes_in_buffer;	/* # of bytes remaining in source buffer */
+  /* Bit input buffer --- note these values are kept in register variables,
+   * not in this struct, inside the inner loops.
+   */
+  bit_buf_type get_buffer;	/* current bit-extraction buffer */
+  int bits_left;		/* # of unused bits in it */
+  /* Pointer needed by jpeg_fill_bit_buffer. */
+  j_decompress_ptr cinfo;	/* back link to decompress master record */
+} bitread_working_state;
+
+/* Macros to declare and load/save bitread local variables. */
+#define BITREAD_STATE_VARS  \
+	register bit_buf_type get_buffer;  \
+	register int bits_left;  \
+	bitread_working_state br_state
+
+#define BITREAD_LOAD_STATE(cinfop,permstate)  \
+	br_state.cinfo = cinfop; \
+	br_state.next_input_byte = cinfop->src->next_input_byte; \
+	br_state.bytes_in_buffer = cinfop->src->bytes_in_buffer; \
+	get_buffer = permstate.get_buffer; \
+	bits_left = permstate.bits_left;
+
+#define BITREAD_SAVE_STATE(cinfop,permstate)  \
+	cinfop->src->next_input_byte = br_state.next_input_byte; \
+	cinfop->src->bytes_in_buffer = br_state.bytes_in_buffer; \
+	permstate.get_buffer = get_buffer; \
+	permstate.bits_left = bits_left
+
+/*
+ * These macros provide the in-line portion of bit fetching.
+ * Use CHECK_BIT_BUFFER to ensure there are N bits in get_buffer
+ * before using GET_BITS, PEEK_BITS, or DROP_BITS.
+ * The variables get_buffer and bits_left are assumed to be locals,
+ * but the state struct might not be (jpeg_huff_decode needs this).
+ *	CHECK_BIT_BUFFER(state,n,action);
+ *		Ensure there are N bits in get_buffer; if suspend, take action.
+ *      val = GET_BITS(n);
+ *		Fetch next N bits.
+ *      val = PEEK_BITS(n);
+ *		Fetch next N bits without removing them from the buffer.
+ *	DROP_BITS(n);
+ *		Discard next N bits.
+ * The value N should be a simple variable, not an expression, because it
+ * is evaluated multiple times.
+ */
+
+#define CHECK_BIT_BUFFER(state,nbits,action) \
+	{ if (bits_left < (nbits)) {  \
+	    if (! jpeg_fill_bit_buffer(&(state),get_buffer,bits_left,nbits))  \
+	      { action; }  \
+	    get_buffer = (state).get_buffer; bits_left = (state).bits_left; } }
+
+#define GET_BITS(nbits) \
+	(((int) (get_buffer >> (bits_left -= (nbits)))) & ((1<<(nbits))-1))
+
+#define PEEK_BITS(nbits) \
+	(((int) (get_buffer >> (bits_left -  (nbits)))) & ((1<<(nbits))-1))
+
+#define DROP_BITS(nbits) \
+	(bits_left -= (nbits))
+
+/* Load up the bit buffer to a depth of at least nbits */
+EXTERN(boolean) jpeg_fill_bit_buffer
+	JPP((bitread_working_state * state, register bit_buf_type get_buffer,
+	     register int bits_left, int nbits));
+
+
+/*
+ * Code for extracting next Huffman-coded symbol from input bit stream.
+ * Again, this is time-critical and we make the main paths be macros.
+ *
+ * We use a lookahead table to process codes of up to HUFF_LOOKAHEAD bits
+ * without looping.  Usually, more than 95% of the Huffman codes will be 8
+ * or fewer bits long.  The few overlength codes are handled with a loop,
+ * which need not be inline code.
+ *
+ * Notes about the HUFF_DECODE macro:
+ * 1. Near the end of the data segment, we may fail to get enough bits
+ *    for a lookahead.  In that case, we do it the hard way.
+ * 2. If the lookahead table contains no entry, the next code must be
+ *    more than HUFF_LOOKAHEAD bits long.
+ * 3. jpeg_huff_decode returns -1 if forced to suspend.
+ */
+
+#define HUFF_DECODE(result,state,htbl,failaction,slowlabel) \
+{ register int nb, look; \
+  if (bits_left < HUFF_LOOKAHEAD) { \
+    if (! jpeg_fill_bit_buffer(&state,get_buffer,bits_left, 0)) {failaction;} \
+    get_buffer = state.get_buffer; bits_left = state.bits_left; \
+    if (bits_left < HUFF_LOOKAHEAD) { \
+      nb = 1; goto slowlabel; \
+    } \
+  } \
+  look = PEEK_BITS(HUFF_LOOKAHEAD); \
+  if ((nb = (htbl->lookup[look] >> HUFF_LOOKAHEAD)) <= HUFF_LOOKAHEAD) { \
+    DROP_BITS(nb); \
+    result = htbl->lookup[look] & ((1 << HUFF_LOOKAHEAD) - 1); \
+  } else { \
+slowlabel: \
+    if ((result=jpeg_huff_decode(&state,get_buffer,bits_left,htbl,nb)) < 0) \
+	{ failaction; } \
+    get_buffer = state.get_buffer; bits_left = state.bits_left; \
+  } \
+}
+
+#define HUFF_DECODE_FAST(s,nb,htbl) \
+  FILL_BIT_BUFFER_FAST; \
+  s = PEEK_BITS(HUFF_LOOKAHEAD); \
+  s = htbl->lookup[s]; \
+  nb = s >> HUFF_LOOKAHEAD; \
+  /* Pre-execute the common case of nb <= HUFF_LOOKAHEAD */ \
+  DROP_BITS(nb); \
+  s = s & ((1 << HUFF_LOOKAHEAD) - 1); \
+  if (nb > HUFF_LOOKAHEAD) { \
+    /* Equivalent of jpeg_huff_decode() */ \
+    /* Don't use GET_BITS() here because we don't want to modify bits_left */ \
+    s = (get_buffer >> bits_left) & ((1 << (nb)) - 1); \
+    while (s > htbl->maxcode[nb]) { \
+      s <<= 1; \
+      s |= GET_BITS(1); \
+      nb++; \
+    } \
+    s = htbl->pub->huffval[ (int) (s + htbl->valoffset[nb]) & 0xFF ]; \
+  }
+
+/* Out-of-line case for Huffman code fetching */
+EXTERN(int) jpeg_huff_decode
+	JPP((bitread_working_state * state, register bit_buf_type get_buffer,
+	     register int bits_left, d_derived_tbl * htbl, int min_bits));
diff --git a/src/libjpeg-turbo/jdinput.c b/src/libjpeg-turbo/jdinput.c
new file mode 100644
index 0000000..9fcd089
--- /dev/null
+++ b/src/libjpeg-turbo/jdinput.c
@@ -0,0 +1,471 @@
+/*
+ * jdinput.c
+ *
+ * Copyright (C) 1991-1997, Thomas G. Lane.
+ * Modified 2002-2009 by Guido Vollbeding.
+ * Copyright (C) 2010, D. R. Commander.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains input control logic for the JPEG decompressor.
+ * These routines are concerned with controlling the decompressor's input
+ * processing (marker reading and coefficient decoding).  The actual input
+ * reading is done in jdmarker.c, jdhuff.c, and jdphuff.c.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jpegcomp.h"
+
+
+/* Private state */
+
+typedef struct {
+  struct jpeg_input_controller pub; /* public fields */
+
+  boolean inheaders;		/* TRUE until first SOS is reached */
+} my_input_controller;
+
+typedef my_input_controller * my_inputctl_ptr;
+
+
+/* Forward declarations */
+METHODDEF(int) consume_markers JPP((j_decompress_ptr cinfo));
+
+
+/*
+ * Routines to calculate various quantities related to the size of the image.
+ */
+
+
+#if JPEG_LIB_VERSION >= 80
+/*
+ * Compute output image dimensions and related values.
+ * NOTE: this is exported for possible use by application.
+ * Hence it mustn't do anything that can't be done twice.
+ */
+
+GLOBAL(void)
+jpeg_core_output_dimensions (j_decompress_ptr cinfo)
+/* Do computations that are needed before master selection phase.
+ * This function is used for transcoding and full decompression.
+ */
+{
+#ifdef IDCT_SCALING_SUPPORTED
+  int ci;
+  jpeg_component_info *compptr;
+
+  /* Compute actual output image dimensions and DCT scaling choices. */
+  if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom) {
+    /* Provide 1/block_size scaling */
+    cinfo->output_width = (JDIMENSION)
+      jdiv_round_up((long) cinfo->image_width, (long) cinfo->block_size);
+    cinfo->output_height = (JDIMENSION)
+      jdiv_round_up((long) cinfo->image_height, (long) cinfo->block_size);
+    cinfo->min_DCT_h_scaled_size = 1;
+    cinfo->min_DCT_v_scaled_size = 1;
+  } else if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom * 2) {
+    /* Provide 2/block_size scaling */
+    cinfo->output_width = (JDIMENSION)
+      jdiv_round_up((long) cinfo->image_width * 2L, (long) cinfo->block_size);
+    cinfo->output_height = (JDIMENSION)
+      jdiv_round_up((long) cinfo->image_height * 2L, (long) cinfo->block_size);
+    cinfo->min_DCT_h_scaled_size = 2;
+    cinfo->min_DCT_v_scaled_size = 2;
+  } else if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom * 4) {
+    /* Provide 4/block_size scaling */
+    cinfo->output_width = (JDIMENSION)
+      jdiv_round_up((long) cinfo->image_width * 4L, (long) cinfo->block_size);
+    cinfo->output_height = (JDIMENSION)
+      jdiv_round_up((long) cinfo->image_height * 4L, (long) cinfo->block_size);
+    cinfo->min_DCT_h_scaled_size = 4;
+    cinfo->min_DCT_v_scaled_size = 4;
+  } else if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom * 8) {
+    /* Provide 8/block_size scaling */
+    cinfo->output_width = (JDIMENSION)
+      jdiv_round_up((long) cinfo->image_width * 8L, (long) cinfo->block_size);
+    cinfo->output_height = (JDIMENSION)
+      jdiv_round_up((long) cinfo->image_height * 8L, (long) cinfo->block_size);
+    cinfo->min_DCT_h_scaled_size = 8;
+    cinfo->min_DCT_v_scaled_size = 8;
+  }
+  /* Recompute dimensions of components */
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    compptr->DCT_h_scaled_size = cinfo->min_DCT_h_scaled_size;
+    compptr->DCT_v_scaled_size = cinfo->min_DCT_v_scaled_size;
+  }
+
+#else /* !IDCT_SCALING_SUPPORTED */
+
+  /* Hardwire it to "no scaling" */
+  cinfo->output_width = cinfo->image_width;
+  cinfo->output_height = cinfo->image_height;
+  /* jdinput.c has already initialized DCT_scaled_size,
+   * and has computed unscaled downsampled_width and downsampled_height.
+   */
+
+#endif /* IDCT_SCALING_SUPPORTED */
+}
+#endif
+
+
+LOCAL(void)
+initial_setup (j_decompress_ptr cinfo)
+/* Called once, when first SOS marker is reached */
+{
+  int ci;
+  jpeg_component_info *compptr;
+
+  /* Make sure image isn't bigger than I can handle */
+  if ((long) cinfo->image_height > (long) JPEG_MAX_DIMENSION ||
+      (long) cinfo->image_width > (long) JPEG_MAX_DIMENSION)
+    ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) JPEG_MAX_DIMENSION);
+
+  /* For now, precision must match compiled-in value... */
+  if (cinfo->data_precision != BITS_IN_JSAMPLE)
+    ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision);
+
+  /* Check that number of components won't exceed internal array sizes */
+  if (cinfo->num_components > MAX_COMPONENTS)
+    ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components,
+	     MAX_COMPONENTS);
+
+  /* Compute maximum sampling factors; check factor validity */
+  cinfo->max_h_samp_factor = 1;
+  cinfo->max_v_samp_factor = 1;
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    if (compptr->h_samp_factor<=0 || compptr->h_samp_factor>MAX_SAMP_FACTOR ||
+	compptr->v_samp_factor<=0 || compptr->v_samp_factor>MAX_SAMP_FACTOR)
+      ERREXIT(cinfo, JERR_BAD_SAMPLING);
+    cinfo->max_h_samp_factor = MAX(cinfo->max_h_samp_factor,
+				   compptr->h_samp_factor);
+    cinfo->max_v_samp_factor = MAX(cinfo->max_v_samp_factor,
+				   compptr->v_samp_factor);
+  }
+
+#if JPEG_LIB_VERSION >=80
+    cinfo->block_size = DCTSIZE;
+    cinfo->natural_order = jpeg_natural_order;
+    cinfo->lim_Se = DCTSIZE2-1;
+#endif
+
+  /* We initialize DCT_scaled_size and min_DCT_scaled_size to DCTSIZE.
+   * In the full decompressor, this will be overridden by jdmaster.c;
+   * but in the transcoder, jdmaster.c is not used, so we must do it here.
+   */
+#if JPEG_LIB_VERSION >= 70
+  cinfo->min_DCT_h_scaled_size = cinfo->min_DCT_v_scaled_size = DCTSIZE;
+#else
+  cinfo->min_DCT_scaled_size = DCTSIZE;
+#endif
+
+  /* Compute dimensions of components */
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+#if JPEG_LIB_VERSION >= 70
+    compptr->DCT_h_scaled_size = compptr->DCT_v_scaled_size = DCTSIZE;
+#else
+    compptr->DCT_scaled_size = DCTSIZE;
+#endif
+    /* Size in DCT blocks */
+    compptr->width_in_blocks = (JDIMENSION)
+      jdiv_round_up((long) cinfo->image_width * (long) compptr->h_samp_factor,
+		    (long) (cinfo->max_h_samp_factor * DCTSIZE));
+    compptr->height_in_blocks = (JDIMENSION)
+      jdiv_round_up((long) cinfo->image_height * (long) compptr->v_samp_factor,
+		    (long) (cinfo->max_v_samp_factor * DCTSIZE));
+    /* downsampled_width and downsampled_height will also be overridden by
+     * jdmaster.c if we are doing full decompression.  The transcoder library
+     * doesn't use these values, but the calling application might.
+     */
+    /* Size in samples */
+    compptr->downsampled_width = (JDIMENSION)
+      jdiv_round_up((long) cinfo->image_width * (long) compptr->h_samp_factor,
+		    (long) cinfo->max_h_samp_factor);
+    compptr->downsampled_height = (JDIMENSION)
+      jdiv_round_up((long) cinfo->image_height * (long) compptr->v_samp_factor,
+		    (long) cinfo->max_v_samp_factor);
+    /* Mark component needed, until color conversion says otherwise */
+    compptr->component_needed = TRUE;
+    /* Mark no quantization table yet saved for component */
+    compptr->quant_table = NULL;
+  }
+
+  /* Compute number of fully interleaved MCU rows. */
+  cinfo->total_iMCU_rows = (JDIMENSION)
+    jdiv_round_up((long) cinfo->image_height,
+		  (long) (cinfo->max_v_samp_factor*DCTSIZE));
+
+  /* Decide whether file contains multiple scans */
+  if (cinfo->comps_in_scan < cinfo->num_components || cinfo->progressive_mode)
+    cinfo->inputctl->has_multiple_scans = TRUE;
+  else
+    cinfo->inputctl->has_multiple_scans = FALSE;
+}
+
+
+LOCAL(void)
+per_scan_setup (j_decompress_ptr cinfo)
+/* Do computations that are needed before processing a JPEG scan */
+/* cinfo->comps_in_scan and cinfo->cur_comp_info[] were set from SOS marker */
+{
+  int ci, mcublks, tmp;
+  jpeg_component_info *compptr;
+  
+  if (cinfo->comps_in_scan == 1) {
+    
+    /* Noninterleaved (single-component) scan */
+    compptr = cinfo->cur_comp_info[0];
+    
+    /* Overall image size in MCUs */
+    cinfo->MCUs_per_row = compptr->width_in_blocks;
+    cinfo->MCU_rows_in_scan = compptr->height_in_blocks;
+    
+    /* For noninterleaved scan, always one block per MCU */
+    compptr->MCU_width = 1;
+    compptr->MCU_height = 1;
+    compptr->MCU_blocks = 1;
+    compptr->MCU_sample_width = compptr->_DCT_scaled_size;
+    compptr->last_col_width = 1;
+    /* For noninterleaved scans, it is convenient to define last_row_height
+     * as the number of block rows present in the last iMCU row.
+     */
+    tmp = (int) (compptr->height_in_blocks % compptr->v_samp_factor);
+    if (tmp == 0) tmp = compptr->v_samp_factor;
+    compptr->last_row_height = tmp;
+    
+    /* Prepare array describing MCU composition */
+    cinfo->blocks_in_MCU = 1;
+    cinfo->MCU_membership[0] = 0;
+    
+  } else {
+    
+    /* Interleaved (multi-component) scan */
+    if (cinfo->comps_in_scan <= 0 || cinfo->comps_in_scan > MAX_COMPS_IN_SCAN)
+      ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->comps_in_scan,
+	       MAX_COMPS_IN_SCAN);
+    
+    /* Overall image size in MCUs */
+    cinfo->MCUs_per_row = (JDIMENSION)
+      jdiv_round_up((long) cinfo->image_width,
+		    (long) (cinfo->max_h_samp_factor*DCTSIZE));
+    cinfo->MCU_rows_in_scan = (JDIMENSION)
+      jdiv_round_up((long) cinfo->image_height,
+		    (long) (cinfo->max_v_samp_factor*DCTSIZE));
+    
+    cinfo->blocks_in_MCU = 0;
+    
+    for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
+      compptr = cinfo->cur_comp_info[ci];
+      /* Sampling factors give # of blocks of component in each MCU */
+      compptr->MCU_width = compptr->h_samp_factor;
+      compptr->MCU_height = compptr->v_samp_factor;
+      compptr->MCU_blocks = compptr->MCU_width * compptr->MCU_height;
+      compptr->MCU_sample_width = compptr->MCU_width * compptr->_DCT_scaled_size;
+      /* Figure number of non-dummy blocks in last MCU column & row */
+      tmp = (int) (compptr->width_in_blocks % compptr->MCU_width);
+      if (tmp == 0) tmp = compptr->MCU_width;
+      compptr->last_col_width = tmp;
+      tmp = (int) (compptr->height_in_blocks % compptr->MCU_height);
+      if (tmp == 0) tmp = compptr->MCU_height;
+      compptr->last_row_height = tmp;
+      /* Prepare array describing MCU composition */
+      mcublks = compptr->MCU_blocks;
+      if (cinfo->blocks_in_MCU + mcublks > D_MAX_BLOCKS_IN_MCU)
+	ERREXIT(cinfo, JERR_BAD_MCU_SIZE);
+      while (mcublks-- > 0) {
+	cinfo->MCU_membership[cinfo->blocks_in_MCU++] = ci;
+      }
+    }
+    
+  }
+}
+
+
+/*
+ * Save away a copy of the Q-table referenced by each component present
+ * in the current scan, unless already saved during a prior scan.
+ *
+ * In a multiple-scan JPEG file, the encoder could assign different components
+ * the same Q-table slot number, but change table definitions between scans
+ * so that each component uses a different Q-table.  (The IJG encoder is not
+ * currently capable of doing this, but other encoders might.)  Since we want
+ * to be able to dequantize all the components at the end of the file, this
+ * means that we have to save away the table actually used for each component.
+ * We do this by copying the table at the start of the first scan containing
+ * the component.
+ * The JPEG spec prohibits the encoder from changing the contents of a Q-table
+ * slot between scans of a component using that slot.  If the encoder does so
+ * anyway, this decoder will simply use the Q-table values that were current
+ * at the start of the first scan for the component.
+ *
+ * The decompressor output side looks only at the saved quant tables,
+ * not at the current Q-table slots.
+ */
+
+LOCAL(void)
+latch_quant_tables (j_decompress_ptr cinfo)
+{
+  int ci, qtblno;
+  jpeg_component_info *compptr;
+  JQUANT_TBL * qtbl;
+
+  for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
+    compptr = cinfo->cur_comp_info[ci];
+    /* No work if we already saved Q-table for this component */
+    if (compptr->quant_table != NULL)
+      continue;
+    /* Make sure specified quantization table is present */
+    qtblno = compptr->quant_tbl_no;
+    if (qtblno < 0 || qtblno >= NUM_QUANT_TBLS ||
+	cinfo->quant_tbl_ptrs[qtblno] == NULL)
+      ERREXIT1(cinfo, JERR_NO_QUANT_TABLE, qtblno);
+    /* OK, save away the quantization table */
+    qtbl = (JQUANT_TBL *)
+      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				  SIZEOF(JQUANT_TBL));
+    MEMCOPY(qtbl, cinfo->quant_tbl_ptrs[qtblno], SIZEOF(JQUANT_TBL));
+    compptr->quant_table = qtbl;
+  }
+}
+
+
+/*
+ * Initialize the input modules to read a scan of compressed data.
+ * The first call to this is done by jdmaster.c after initializing
+ * the entire decompressor (during jpeg_start_decompress).
+ * Subsequent calls come from consume_markers, below.
+ */
+
+METHODDEF(void)
+start_input_pass (j_decompress_ptr cinfo)
+{
+  per_scan_setup(cinfo);
+  latch_quant_tables(cinfo);
+  (*cinfo->entropy->start_pass) (cinfo);
+  (*cinfo->coef->start_input_pass) (cinfo);
+  cinfo->inputctl->consume_input = cinfo->coef->consume_data;
+}
+
+
+/*
+ * Finish up after inputting a compressed-data scan.
+ * This is called by the coefficient controller after it's read all
+ * the expected data of the scan.
+ */
+
+METHODDEF(void)
+finish_input_pass (j_decompress_ptr cinfo)
+{
+  cinfo->inputctl->consume_input = consume_markers;
+}
+
+
+/*
+ * Read JPEG markers before, between, or after compressed-data scans.
+ * Change state as necessary when a new scan is reached.
+ * Return value is JPEG_SUSPENDED, JPEG_REACHED_SOS, or JPEG_REACHED_EOI.
+ *
+ * The consume_input method pointer points either here or to the
+ * coefficient controller's consume_data routine, depending on whether
+ * we are reading a compressed data segment or inter-segment markers.
+ */
+
+METHODDEF(int)
+consume_markers (j_decompress_ptr cinfo)
+{
+  my_inputctl_ptr inputctl = (my_inputctl_ptr) cinfo->inputctl;
+  int val;
+
+  if (inputctl->pub.eoi_reached) /* After hitting EOI, read no further */
+    return JPEG_REACHED_EOI;
+
+  val = (*cinfo->marker->read_markers) (cinfo);
+
+  switch (val) {
+  case JPEG_REACHED_SOS:	/* Found SOS */
+    if (inputctl->inheaders) {	/* 1st SOS */
+      initial_setup(cinfo);
+      inputctl->inheaders = FALSE;
+      /* Note: start_input_pass must be called by jdmaster.c
+       * before any more input can be consumed.  jdapimin.c is
+       * responsible for enforcing this sequencing.
+       */
+    } else {			/* 2nd or later SOS marker */
+      if (! inputctl->pub.has_multiple_scans)
+	ERREXIT(cinfo, JERR_EOI_EXPECTED); /* Oops, I wasn't expecting this! */
+      start_input_pass(cinfo);
+    }
+    break;
+  case JPEG_REACHED_EOI:	/* Found EOI */
+    inputctl->pub.eoi_reached = TRUE;
+    if (inputctl->inheaders) {	/* Tables-only datastream, apparently */
+      if (cinfo->marker->saw_SOF)
+	ERREXIT(cinfo, JERR_SOF_NO_SOS);
+    } else {
+      /* Prevent infinite loop in coef ctlr's decompress_data routine
+       * if user set output_scan_number larger than number of scans.
+       */
+      if (cinfo->output_scan_number > cinfo->input_scan_number)
+	cinfo->output_scan_number = cinfo->input_scan_number;
+    }
+    break;
+  case JPEG_SUSPENDED:
+    break;
+  }
+
+  return val;
+}
+
+
+/*
+ * Reset state to begin a fresh datastream.
+ */
+
+METHODDEF(void)
+reset_input_controller (j_decompress_ptr cinfo)
+{
+  my_inputctl_ptr inputctl = (my_inputctl_ptr) cinfo->inputctl;
+
+  inputctl->pub.consume_input = consume_markers;
+  inputctl->pub.has_multiple_scans = FALSE; /* "unknown" would be better */
+  inputctl->pub.eoi_reached = FALSE;
+  inputctl->inheaders = TRUE;
+  /* Reset other modules */
+  (*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo);
+  (*cinfo->marker->reset_marker_reader) (cinfo);
+  /* Reset progression state -- would be cleaner if entropy decoder did this */
+  cinfo->coef_bits = NULL;
+}
+
+
+/*
+ * Initialize the input controller module.
+ * This is called only once, when the decompression object is created.
+ */
+
+GLOBAL(void)
+jinit_input_controller (j_decompress_ptr cinfo)
+{
+  my_inputctl_ptr inputctl;
+
+  /* Create subobject in permanent pool */
+  inputctl = (my_inputctl_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
+				SIZEOF(my_input_controller));
+  cinfo->inputctl = (struct jpeg_input_controller *) inputctl;
+  /* Initialize method pointers */
+  inputctl->pub.consume_input = consume_markers;
+  inputctl->pub.reset_input_controller = reset_input_controller;
+  inputctl->pub.start_input_pass = start_input_pass;
+  inputctl->pub.finish_input_pass = finish_input_pass;
+  /* Initialize state: can't use reset_input_controller since we don't
+   * want to try to reset other modules yet.
+   */
+  inputctl->pub.has_multiple_scans = FALSE; /* "unknown" would be better */
+  inputctl->pub.eoi_reached = FALSE;
+  inputctl->inheaders = TRUE;
+}
diff --git a/src/libjpeg-turbo/jdmainct.c b/src/libjpeg-turbo/jdmainct.c
new file mode 100644
index 0000000..eb32cae
--- /dev/null
+++ b/src/libjpeg-turbo/jdmainct.c
@@ -0,0 +1,514 @@
+/*
+ * jdmainct.c
+ *
+ * Copyright (C) 1994-1996, Thomas G. Lane.
+ * Copyright (C) 2010, D. R. Commander.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains the main buffer controller for decompression.
+ * The main buffer lies between the JPEG decompressor proper and the
+ * post-processor; it holds downsampled data in the JPEG colorspace.
+ *
+ * Note that this code is bypassed in raw-data mode, since the application
+ * supplies the equivalent of the main buffer in that case.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jpegcomp.h"
+
+
+/*
+ * In the current system design, the main buffer need never be a full-image
+ * buffer; any full-height buffers will be found inside the coefficient or
+ * postprocessing controllers.  Nonetheless, the main controller is not
+ * trivial.  Its responsibility is to provide context rows for upsampling/
+ * rescaling, and doing this in an efficient fashion is a bit tricky.
+ *
+ * Postprocessor input data is counted in "row groups".  A row group
+ * is defined to be (v_samp_factor * DCT_scaled_size / min_DCT_scaled_size)
+ * sample rows of each component.  (We require DCT_scaled_size values to be
+ * chosen such that these numbers are integers.  In practice DCT_scaled_size
+ * values will likely be powers of two, so we actually have the stronger
+ * condition that DCT_scaled_size / min_DCT_scaled_size is an integer.)
+ * Upsampling will typically produce max_v_samp_factor pixel rows from each
+ * row group (times any additional scale factor that the upsampler is
+ * applying).
+ *
+ * The coefficient controller will deliver data to us one iMCU row at a time;
+ * each iMCU row contains v_samp_factor * DCT_scaled_size sample rows, or
+ * exactly min_DCT_scaled_size row groups.  (This amount of data corresponds
+ * to one row of MCUs when the image is fully interleaved.)  Note that the
+ * number of sample rows varies across components, but the number of row
+ * groups does not.  Some garbage sample rows may be included in the last iMCU
+ * row at the bottom of the image.
+ *
+ * Depending on the vertical scaling algorithm used, the upsampler may need
+ * access to the sample row(s) above and below its current input row group.
+ * The upsampler is required to set need_context_rows TRUE at global selection
+ * time if so.  When need_context_rows is FALSE, this controller can simply
+ * obtain one iMCU row at a time from the coefficient controller and dole it
+ * out as row groups to the postprocessor.
+ *
+ * When need_context_rows is TRUE, this controller guarantees that the buffer
+ * passed to postprocessing contains at least one row group's worth of samples
+ * above and below the row group(s) being processed.  Note that the context
+ * rows "above" the first passed row group appear at negative row offsets in
+ * the passed buffer.  At the top and bottom of the image, the required
+ * context rows are manufactured by duplicating the first or last real sample
+ * row; this avoids having special cases in the upsampling inner loops.
+ *
+ * The amount of context is fixed at one row group just because that's a
+ * convenient number for this controller to work with.  The existing
+ * upsamplers really only need one sample row of context.  An upsampler
+ * supporting arbitrary output rescaling might wish for more than one row
+ * group of context when shrinking the image; tough, we don't handle that.
+ * (This is justified by the assumption that downsizing will be handled mostly
+ * by adjusting the DCT_scaled_size values, so that the actual scale factor at
+ * the upsample step needn't be much less than one.)
+ *
+ * To provide the desired context, we have to retain the last two row groups
+ * of one iMCU row while reading in the next iMCU row.  (The last row group
+ * can't be processed until we have another row group for its below-context,
+ * and so we have to save the next-to-last group too for its above-context.)
+ * We could do this most simply by copying data around in our buffer, but
+ * that'd be very slow.  We can avoid copying any data by creating a rather
+ * strange pointer structure.  Here's how it works.  We allocate a workspace
+ * consisting of M+2 row groups (where M = min_DCT_scaled_size is the number
+ * of row groups per iMCU row).  We create two sets of redundant pointers to
+ * the workspace.  Labeling the physical row groups 0 to M+1, the synthesized
+ * pointer lists look like this:
+ *                   M+1                          M-1
+ * master pointer --> 0         master pointer --> 0
+ *                    1                            1
+ *                   ...                          ...
+ *                   M-3                          M-3
+ *                   M-2                           M
+ *                   M-1                          M+1
+ *                    M                           M-2
+ *                   M+1                          M-1
+ *                    0                            0
+ * We read alternate iMCU rows using each master pointer; thus the last two
+ * row groups of the previous iMCU row remain un-overwritten in the workspace.
+ * The pointer lists are set up so that the required context rows appear to
+ * be adjacent to the proper places when we pass the pointer lists to the
+ * upsampler.
+ *
+ * The above pictures describe the normal state of the pointer lists.
+ * At top and bottom of the image, we diddle the pointer lists to duplicate
+ * the first or last sample row as necessary (this is cheaper than copying
+ * sample rows around).
+ *
+ * This scheme breaks down if M < 2, ie, min_DCT_scaled_size is 1.  In that
+ * situation each iMCU row provides only one row group so the buffering logic
+ * must be different (eg, we must read two iMCU rows before we can emit the
+ * first row group).  For now, we simply do not support providing context
+ * rows when min_DCT_scaled_size is 1.  That combination seems unlikely to
+ * be worth providing --- if someone wants a 1/8th-size preview, they probably
+ * want it quick and dirty, so a context-free upsampler is sufficient.
+ */
+
+
+/* Private buffer controller object */
+
+typedef struct {
+  struct jpeg_d_main_controller pub; /* public fields */
+
+  /* Pointer to allocated workspace (M or M+2 row groups). */
+  JSAMPARRAY buffer[MAX_COMPONENTS];
+
+  boolean buffer_full;		/* Have we gotten an iMCU row from decoder? */
+  JDIMENSION rowgroup_ctr;	/* counts row groups output to postprocessor */
+
+  /* Remaining fields are only used in the context case. */
+
+  /* These are the master pointers to the funny-order pointer lists. */
+  JSAMPIMAGE xbuffer[2];	/* pointers to weird pointer lists */
+
+  int whichptr;			/* indicates which pointer set is now in use */
+  int context_state;		/* process_data state machine status */
+  JDIMENSION rowgroups_avail;	/* row groups available to postprocessor */
+  JDIMENSION iMCU_row_ctr;	/* counts iMCU rows to detect image top/bot */
+} my_main_controller;
+
+typedef my_main_controller * my_main_ptr;
+
+/* context_state values: */
+#define CTX_PREPARE_FOR_IMCU	0	/* need to prepare for MCU row */
+#define CTX_PROCESS_IMCU	1	/* feeding iMCU to postprocessor */
+#define CTX_POSTPONED_ROW	2	/* feeding postponed row group */
+
+
+/* Forward declarations */
+METHODDEF(void) process_data_simple_main
+	JPP((j_decompress_ptr cinfo, JSAMPARRAY output_buf,
+	     JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail));
+METHODDEF(void) process_data_context_main
+	JPP((j_decompress_ptr cinfo, JSAMPARRAY output_buf,
+	     JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail));
+#ifdef QUANT_2PASS_SUPPORTED
+METHODDEF(void) process_data_crank_post
+	JPP((j_decompress_ptr cinfo, JSAMPARRAY output_buf,
+	     JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail));
+#endif
+
+
+LOCAL(void)
+alloc_funny_pointers (j_decompress_ptr cinfo)
+/* Allocate space for the funny pointer lists.
+ * This is done only once, not once per pass.
+ */
+{
+  my_main_ptr main_ptr = (my_main_ptr) cinfo->main;
+  int ci, rgroup;
+  int M = cinfo->_min_DCT_scaled_size;
+  jpeg_component_info *compptr;
+  JSAMPARRAY xbuf;
+
+  /* Get top-level space for component array pointers.
+   * We alloc both arrays with one call to save a few cycles.
+   */
+  main_ptr->xbuffer[0] = (JSAMPIMAGE)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				cinfo->num_components * 2 * SIZEOF(JSAMPARRAY));
+  main_ptr->xbuffer[1] = main_ptr->xbuffer[0] + cinfo->num_components;
+
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    rgroup = (compptr->v_samp_factor * compptr->_DCT_scaled_size) /
+      cinfo->_min_DCT_scaled_size; /* height of a row group of component */
+    /* Get space for pointer lists --- M+4 row groups in each list.
+     * We alloc both pointer lists with one call to save a few cycles.
+     */
+    xbuf = (JSAMPARRAY)
+      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				  2 * (rgroup * (M + 4)) * SIZEOF(JSAMPROW));
+    xbuf += rgroup;		/* want one row group at negative offsets */
+    main_ptr->xbuffer[0][ci] = xbuf;
+    xbuf += rgroup * (M + 4);
+    main_ptr->xbuffer[1][ci] = xbuf;
+  }
+}
+
+
+LOCAL(void)
+make_funny_pointers (j_decompress_ptr cinfo)
+/* Create the funny pointer lists discussed in the comments above.
+ * The actual workspace is already allocated (in main_ptr->buffer),
+ * and the space for the pointer lists is allocated too.
+ * This routine just fills in the curiously ordered lists.
+ * This will be repeated at the beginning of each pass.
+ */
+{
+  my_main_ptr main_ptr = (my_main_ptr) cinfo->main;
+  int ci, i, rgroup;
+  int M = cinfo->_min_DCT_scaled_size;
+  jpeg_component_info *compptr;
+  JSAMPARRAY buf, xbuf0, xbuf1;
+
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    rgroup = (compptr->v_samp_factor * compptr->_DCT_scaled_size) /
+      cinfo->_min_DCT_scaled_size; /* height of a row group of component */
+    xbuf0 = main_ptr->xbuffer[0][ci];
+    xbuf1 = main_ptr->xbuffer[1][ci];
+    /* First copy the workspace pointers as-is */
+    buf = main_ptr->buffer[ci];
+    for (i = 0; i < rgroup * (M + 2); i++) {
+      xbuf0[i] = xbuf1[i] = buf[i];
+    }
+    /* In the second list, put the last four row groups in swapped order */
+    for (i = 0; i < rgroup * 2; i++) {
+      xbuf1[rgroup*(M-2) + i] = buf[rgroup*M + i];
+      xbuf1[rgroup*M + i] = buf[rgroup*(M-2) + i];
+    }
+    /* The wraparound pointers at top and bottom will be filled later
+     * (see set_wraparound_pointers, below).  Initially we want the "above"
+     * pointers to duplicate the first actual data line.  This only needs
+     * to happen in xbuffer[0].
+     */
+    for (i = 0; i < rgroup; i++) {
+      xbuf0[i - rgroup] = xbuf0[0];
+    }
+  }
+}
+
+
+LOCAL(void)
+set_wraparound_pointers (j_decompress_ptr cinfo)
+/* Set up the "wraparound" pointers at top and bottom of the pointer lists.
+ * This changes the pointer list state from top-of-image to the normal state.
+ */
+{
+  my_main_ptr main_ptr = (my_main_ptr) cinfo->main;
+  int ci, i, rgroup;
+  int M = cinfo->_min_DCT_scaled_size;
+  jpeg_component_info *compptr;
+  JSAMPARRAY xbuf0, xbuf1;
+
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    rgroup = (compptr->v_samp_factor * compptr->_DCT_scaled_size) /
+      cinfo->_min_DCT_scaled_size; /* height of a row group of component */
+    xbuf0 = main_ptr->xbuffer[0][ci];
+    xbuf1 = main_ptr->xbuffer[1][ci];
+    for (i = 0; i < rgroup; i++) {
+      xbuf0[i - rgroup] = xbuf0[rgroup*(M+1) + i];
+      xbuf1[i - rgroup] = xbuf1[rgroup*(M+1) + i];
+      xbuf0[rgroup*(M+2) + i] = xbuf0[i];
+      xbuf1[rgroup*(M+2) + i] = xbuf1[i];
+    }
+  }
+}
+
+
+LOCAL(void)
+set_bottom_pointers (j_decompress_ptr cinfo)
+/* Change the pointer lists to duplicate the last sample row at the bottom
+ * of the image.  whichptr indicates which xbuffer holds the final iMCU row.
+ * Also sets rowgroups_avail to indicate number of nondummy row groups in row.
+ */
+{
+  my_main_ptr main_ptr = (my_main_ptr) cinfo->main;
+  int ci, i, rgroup, iMCUheight, rows_left;
+  jpeg_component_info *compptr;
+  JSAMPARRAY xbuf;
+
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    /* Count sample rows in one iMCU row and in one row group */
+    iMCUheight = compptr->v_samp_factor * compptr->_DCT_scaled_size;
+    rgroup = iMCUheight / cinfo->_min_DCT_scaled_size;
+    /* Count nondummy sample rows remaining for this component */
+    rows_left = (int) (compptr->downsampled_height % (JDIMENSION) iMCUheight);
+    if (rows_left == 0) rows_left = iMCUheight;
+    /* Count nondummy row groups.  Should get same answer for each component,
+     * so we need only do it once.
+     */
+    if (ci == 0) {
+      main_ptr->rowgroups_avail = (JDIMENSION) ((rows_left-1) / rgroup + 1);
+    }
+    /* Duplicate the last real sample row rgroup*2 times; this pads out the
+     * last partial rowgroup and ensures at least one full rowgroup of context.
+     */
+    xbuf = main_ptr->xbuffer[main_ptr->whichptr][ci];
+    for (i = 0; i < rgroup * 2; i++) {
+      xbuf[rows_left + i] = xbuf[rows_left-1];
+    }
+  }
+}
+
+
+/*
+ * Initialize for a processing pass.
+ */
+
+METHODDEF(void)
+start_pass_main (j_decompress_ptr cinfo, J_BUF_MODE pass_mode)
+{
+  my_main_ptr main_ptr = (my_main_ptr) cinfo->main;
+
+  switch (pass_mode) {
+  case JBUF_PASS_THRU:
+    if (cinfo->upsample->need_context_rows) {
+      main_ptr->pub.process_data = process_data_context_main;
+      make_funny_pointers(cinfo); /* Create the xbuffer[] lists */
+      main_ptr->whichptr = 0;	/* Read first iMCU row into xbuffer[0] */
+      main_ptr->context_state = CTX_PREPARE_FOR_IMCU;
+      main_ptr->iMCU_row_ctr = 0;
+    } else {
+      /* Simple case with no context needed */
+      main_ptr->pub.process_data = process_data_simple_main;
+    }
+    main_ptr->buffer_full = FALSE;	/* Mark buffer empty */
+    main_ptr->rowgroup_ctr = 0;
+    break;
+#ifdef QUANT_2PASS_SUPPORTED
+  case JBUF_CRANK_DEST:
+    /* For last pass of 2-pass quantization, just crank the postprocessor */
+    main_ptr->pub.process_data = process_data_crank_post;
+    break;
+#endif
+  default:
+    ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
+    break;
+  }
+}
+
+
+/*
+ * Process some data.
+ * This handles the simple case where no context is required.
+ */
+
+METHODDEF(void)
+process_data_simple_main (j_decompress_ptr cinfo,
+			  JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
+			  JDIMENSION out_rows_avail)
+{
+  my_main_ptr main_ptr = (my_main_ptr) cinfo->main;
+  JDIMENSION rowgroups_avail;
+
+  /* Read input data if we haven't filled the main buffer yet */
+  if (! main_ptr->buffer_full) {
+    if (! (*cinfo->coef->decompress_data) (cinfo, main_ptr->buffer))
+      return;			/* suspension forced, can do nothing more */
+    main_ptr->buffer_full = TRUE;	/* OK, we have an iMCU row to work with */
+  }
+
+  /* There are always min_DCT_scaled_size row groups in an iMCU row. */
+  rowgroups_avail = (JDIMENSION) cinfo->_min_DCT_scaled_size;
+  /* Note: at the bottom of the image, we may pass extra garbage row groups
+   * to the postprocessor.  The postprocessor has to check for bottom
+   * of image anyway (at row resolution), so no point in us doing it too.
+   */
+
+  /* Feed the postprocessor */
+  (*cinfo->post->post_process_data) (cinfo, main_ptr->buffer,
+				     &main_ptr->rowgroup_ctr, rowgroups_avail,
+				     output_buf, out_row_ctr, out_rows_avail);
+
+  /* Has postprocessor consumed all the data yet? If so, mark buffer empty */
+  if (main_ptr->rowgroup_ctr >= rowgroups_avail) {
+    main_ptr->buffer_full = FALSE;
+    main_ptr->rowgroup_ctr = 0;
+  }
+}
+
+
+/*
+ * Process some data.
+ * This handles the case where context rows must be provided.
+ */
+
+METHODDEF(void)
+process_data_context_main (j_decompress_ptr cinfo,
+			   JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
+			   JDIMENSION out_rows_avail)
+{
+  my_main_ptr main_ptr = (my_main_ptr) cinfo->main;
+
+  /* Read input data if we haven't filled the main buffer yet */
+  if (! main_ptr->buffer_full) {
+    if (! (*cinfo->coef->decompress_data) (cinfo,
+					   main_ptr->xbuffer[main_ptr->whichptr]))
+      return;			/* suspension forced, can do nothing more */
+    main_ptr->buffer_full = TRUE;	/* OK, we have an iMCU row to work with */
+    main_ptr->iMCU_row_ctr++;	/* count rows received */
+  }
+
+  /* Postprocessor typically will not swallow all the input data it is handed
+   * in one call (due to filling the output buffer first).  Must be prepared
+   * to exit and restart.  This switch lets us keep track of how far we got.
+   * Note that each case falls through to the next on successful completion.
+   */
+  switch (main_ptr->context_state) {
+  case CTX_POSTPONED_ROW:
+    /* Call postprocessor using previously set pointers for postponed row */
+    (*cinfo->post->post_process_data) (cinfo, main_ptr->xbuffer[main_ptr->whichptr],
+			&main_ptr->rowgroup_ctr, main_ptr->rowgroups_avail,
+			output_buf, out_row_ctr, out_rows_avail);
+    if (main_ptr->rowgroup_ctr < main_ptr->rowgroups_avail)
+      return;			/* Need to suspend */
+    main_ptr->context_state = CTX_PREPARE_FOR_IMCU;
+    if (*out_row_ctr >= out_rows_avail)
+      return;			/* Postprocessor exactly filled output buf */
+    /*FALLTHROUGH*/
+  case CTX_PREPARE_FOR_IMCU:
+    /* Prepare to process first M-1 row groups of this iMCU row */
+    main_ptr->rowgroup_ctr = 0;
+    main_ptr->rowgroups_avail = (JDIMENSION) (cinfo->_min_DCT_scaled_size - 1);
+    /* Check for bottom of image: if so, tweak pointers to "duplicate"
+     * the last sample row, and adjust rowgroups_avail to ignore padding rows.
+     */
+    if (main_ptr->iMCU_row_ctr == cinfo->total_iMCU_rows)
+      set_bottom_pointers(cinfo);
+    main_ptr->context_state = CTX_PROCESS_IMCU;
+    /*FALLTHROUGH*/
+  case CTX_PROCESS_IMCU:
+    /* Call postprocessor using previously set pointers */
+    (*cinfo->post->post_process_data) (cinfo, main_ptr->xbuffer[main_ptr->whichptr],
+			&main_ptr->rowgroup_ctr, main_ptr->rowgroups_avail,
+			output_buf, out_row_ctr, out_rows_avail);
+    if (main_ptr->rowgroup_ctr < main_ptr->rowgroups_avail)
+      return;			/* Need to suspend */
+    /* After the first iMCU, change wraparound pointers to normal state */
+    if (main_ptr->iMCU_row_ctr == 1)
+      set_wraparound_pointers(cinfo);
+    /* Prepare to load new iMCU row using other xbuffer list */
+    main_ptr->whichptr ^= 1;	/* 0=>1 or 1=>0 */
+    main_ptr->buffer_full = FALSE;
+    /* Still need to process last row group of this iMCU row, */
+    /* which is saved at index M+1 of the other xbuffer */
+    main_ptr->rowgroup_ctr = (JDIMENSION) (cinfo->_min_DCT_scaled_size + 1);
+    main_ptr->rowgroups_avail = (JDIMENSION) (cinfo->_min_DCT_scaled_size + 2);
+    main_ptr->context_state = CTX_POSTPONED_ROW;
+  }
+}
+
+
+/*
+ * Process some data.
+ * Final pass of two-pass quantization: just call the postprocessor.
+ * Source data will be the postprocessor controller's internal buffer.
+ */
+
+#ifdef QUANT_2PASS_SUPPORTED
+
+METHODDEF(void)
+process_data_crank_post (j_decompress_ptr cinfo,
+			 JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
+			 JDIMENSION out_rows_avail)
+{
+  (*cinfo->post->post_process_data) (cinfo, (JSAMPIMAGE) NULL,
+				     (JDIMENSION *) NULL, (JDIMENSION) 0,
+				     output_buf, out_row_ctr, out_rows_avail);
+}
+
+#endif /* QUANT_2PASS_SUPPORTED */
+
+
+/*
+ * Initialize main buffer controller.
+ */
+
+GLOBAL(void)
+jinit_d_main_controller (j_decompress_ptr cinfo, boolean need_full_buffer)
+{
+  my_main_ptr main_ptr;
+  int ci, rgroup, ngroups;
+  jpeg_component_info *compptr;
+
+  main_ptr = (my_main_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				SIZEOF(my_main_controller));
+  cinfo->main = (struct jpeg_d_main_controller *) main_ptr;
+  main_ptr->pub.start_pass = start_pass_main;
+
+  if (need_full_buffer)		/* shouldn't happen */
+    ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
+
+  /* Allocate the workspace.
+   * ngroups is the number of row groups we need.
+   */
+  if (cinfo->upsample->need_context_rows) {
+    if (cinfo->_min_DCT_scaled_size < 2) /* unsupported, see comments above */
+      ERREXIT(cinfo, JERR_NOTIMPL);
+    alloc_funny_pointers(cinfo); /* Alloc space for xbuffer[] lists */
+    ngroups = cinfo->_min_DCT_scaled_size + 2;
+  } else {
+    ngroups = cinfo->_min_DCT_scaled_size;
+  }
+
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    rgroup = (compptr->v_samp_factor * compptr->_DCT_scaled_size) /
+      cinfo->_min_DCT_scaled_size; /* height of a row group of component */
+    main_ptr->buffer[ci] = (*cinfo->mem->alloc_sarray)
+			((j_common_ptr) cinfo, JPOOL_IMAGE,
+			 compptr->width_in_blocks * compptr->_DCT_scaled_size,
+			 (JDIMENSION) (rgroup * ngroups));
+  }
+}
diff --git a/src/libjpeg-turbo/jdmarker.c b/src/libjpeg-turbo/jdmarker.c
new file mode 100644
index 0000000..d8dcba9
--- /dev/null
+++ b/src/libjpeg-turbo/jdmarker.c
@@ -0,0 +1,1364 @@
+/*
+ * jdmarker.c
+ *
+ * Copyright (C) 1991-1998, Thomas G. Lane.
+ * Copyright (C) 2012, D. R. Commander.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains routines to decode JPEG datastream markers.
+ * Most of the complexity arises from our desire to support input
+ * suspension: if not all of the data for a marker is available,
+ * we must exit back to the application.  On resumption, we reprocess
+ * the marker.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+
+
+typedef enum {			/* JPEG marker codes */
+  M_SOF0  = 0xc0,
+  M_SOF1  = 0xc1,
+  M_SOF2  = 0xc2,
+  M_SOF3  = 0xc3,
+  
+  M_SOF5  = 0xc5,
+  M_SOF6  = 0xc6,
+  M_SOF7  = 0xc7,
+  
+  M_JPG   = 0xc8,
+  M_SOF9  = 0xc9,
+  M_SOF10 = 0xca,
+  M_SOF11 = 0xcb,
+  
+  M_SOF13 = 0xcd,
+  M_SOF14 = 0xce,
+  M_SOF15 = 0xcf,
+  
+  M_DHT   = 0xc4,
+  
+  M_DAC   = 0xcc,
+  
+  M_RST0  = 0xd0,
+  M_RST1  = 0xd1,
+  M_RST2  = 0xd2,
+  M_RST3  = 0xd3,
+  M_RST4  = 0xd4,
+  M_RST5  = 0xd5,
+  M_RST6  = 0xd6,
+  M_RST7  = 0xd7,
+  
+  M_SOI   = 0xd8,
+  M_EOI   = 0xd9,
+  M_SOS   = 0xda,
+  M_DQT   = 0xdb,
+  M_DNL   = 0xdc,
+  M_DRI   = 0xdd,
+  M_DHP   = 0xde,
+  M_EXP   = 0xdf,
+  
+  M_APP0  = 0xe0,
+  M_APP1  = 0xe1,
+  M_APP2  = 0xe2,
+  M_APP3  = 0xe3,
+  M_APP4  = 0xe4,
+  M_APP5  = 0xe5,
+  M_APP6  = 0xe6,
+  M_APP7  = 0xe7,
+  M_APP8  = 0xe8,
+  M_APP9  = 0xe9,
+  M_APP10 = 0xea,
+  M_APP11 = 0xeb,
+  M_APP12 = 0xec,
+  M_APP13 = 0xed,
+  M_APP14 = 0xee,
+  M_APP15 = 0xef,
+  
+  M_JPG0  = 0xf0,
+  M_JPG13 = 0xfd,
+  M_COM   = 0xfe,
+  
+  M_TEM   = 0x01,
+  
+  M_ERROR = 0x100
+} JPEG_MARKER;
+
+
+/* Private state */
+
+typedef struct {
+  struct jpeg_marker_reader pub; /* public fields */
+
+  /* Application-overridable marker processing methods */
+  jpeg_marker_parser_method process_COM;
+  jpeg_marker_parser_method process_APPn[16];
+
+  /* Limit on marker data length to save for each marker type */
+  unsigned int length_limit_COM;
+  unsigned int length_limit_APPn[16];
+
+  /* Status of COM/APPn marker saving */
+  jpeg_saved_marker_ptr cur_marker;	/* NULL if not processing a marker */
+  unsigned int bytes_read;		/* data bytes read so far in marker */
+  /* Note: cur_marker is not linked into marker_list until it's all read. */
+} my_marker_reader;
+
+typedef my_marker_reader * my_marker_ptr;
+
+
+/*
+ * Macros for fetching data from the data source module.
+ *
+ * At all times, cinfo->src->next_input_byte and ->bytes_in_buffer reflect
+ * the current restart point; we update them only when we have reached a
+ * suitable place to restart if a suspension occurs.
+ */
+
+/* Declare and initialize local copies of input pointer/count */
+#define INPUT_VARS(cinfo)  \
+	struct jpeg_source_mgr * datasrc = (cinfo)->src;  \
+	const JOCTET * next_input_byte = datasrc->next_input_byte;  \
+	size_t bytes_in_buffer = datasrc->bytes_in_buffer
+
+/* Unload the local copies --- do this only at a restart boundary */
+#define INPUT_SYNC(cinfo)  \
+	( datasrc->next_input_byte = next_input_byte,  \
+	  datasrc->bytes_in_buffer = bytes_in_buffer )
+
+/* Reload the local copies --- used only in MAKE_BYTE_AVAIL */
+#define INPUT_RELOAD(cinfo)  \
+	( next_input_byte = datasrc->next_input_byte,  \
+	  bytes_in_buffer = datasrc->bytes_in_buffer )
+
+/* Internal macro for INPUT_BYTE and INPUT_2BYTES: make a byte available.
+ * Note we do *not* do INPUT_SYNC before calling fill_input_buffer,
+ * but we must reload the local copies after a successful fill.
+ */
+#define MAKE_BYTE_AVAIL(cinfo,action)  \
+	if (bytes_in_buffer == 0) {  \
+	  if (! (*datasrc->fill_input_buffer) (cinfo))  \
+	    { action; }  \
+	  INPUT_RELOAD(cinfo);  \
+	}
+
+/* Read a byte into variable V.
+ * If must suspend, take the specified action (typically "return FALSE").
+ */
+#define INPUT_BYTE(cinfo,V,action)  \
+	MAKESTMT( MAKE_BYTE_AVAIL(cinfo,action); \
+		  bytes_in_buffer--; \
+		  V = GETJOCTET(*next_input_byte++); )
+
+/* As above, but read two bytes interpreted as an unsigned 16-bit integer.
+ * V should be declared unsigned int or perhaps INT32.
+ */
+#define INPUT_2BYTES(cinfo,V,action)  \
+	MAKESTMT( MAKE_BYTE_AVAIL(cinfo,action); \
+		  bytes_in_buffer--; \
+		  V = ((unsigned int) GETJOCTET(*next_input_byte++)) << 8; \
+		  MAKE_BYTE_AVAIL(cinfo,action); \
+		  bytes_in_buffer--; \
+		  V += GETJOCTET(*next_input_byte++); )
+
+
+/*
+ * Routines to process JPEG markers.
+ *
+ * Entry condition: JPEG marker itself has been read and its code saved
+ *   in cinfo->unread_marker; input restart point is just after the marker.
+ *
+ * Exit: if return TRUE, have read and processed any parameters, and have
+ *   updated the restart point to point after the parameters.
+ *   If return FALSE, was forced to suspend before reaching end of
+ *   marker parameters; restart point has not been moved.  Same routine
+ *   will be called again after application supplies more input data.
+ *
+ * This approach to suspension assumes that all of a marker's parameters
+ * can fit into a single input bufferload.  This should hold for "normal"
+ * markers.  Some COM/APPn markers might have large parameter segments
+ * that might not fit.  If we are simply dropping such a marker, we use
+ * skip_input_data to get past it, and thereby put the problem on the
+ * source manager's shoulders.  If we are saving the marker's contents
+ * into memory, we use a slightly different convention: when forced to
+ * suspend, the marker processor updates the restart point to the end of
+ * what it's consumed (ie, the end of the buffer) before returning FALSE.
+ * On resumption, cinfo->unread_marker still contains the marker code,
+ * but the data source will point to the next chunk of marker data.
+ * The marker processor must retain internal state to deal with this.
+ *
+ * Note that we don't bother to avoid duplicate trace messages if a
+ * suspension occurs within marker parameters.  Other side effects
+ * require more care.
+ */
+
+
+LOCAL(boolean)
+get_soi (j_decompress_ptr cinfo)
+/* Process an SOI marker */
+{
+  int i;
+  
+  TRACEMS(cinfo, 1, JTRC_SOI);
+
+  if (cinfo->marker->saw_SOI)
+    ERREXIT(cinfo, JERR_SOI_DUPLICATE);
+
+  /* Reset all parameters that are defined to be reset by SOI */
+
+  for (i = 0; i < NUM_ARITH_TBLS; i++) {
+    cinfo->arith_dc_L[i] = 0;
+    cinfo->arith_dc_U[i] = 1;
+    cinfo->arith_ac_K[i] = 5;
+  }
+  cinfo->restart_interval = 0;
+
+  /* Set initial assumptions for colorspace etc */
+
+  cinfo->jpeg_color_space = JCS_UNKNOWN;
+  cinfo->CCIR601_sampling = FALSE; /* Assume non-CCIR sampling??? */
+
+  cinfo->saw_JFIF_marker = FALSE;
+  cinfo->JFIF_major_version = 1; /* set default JFIF APP0 values */
+  cinfo->JFIF_minor_version = 1;
+  cinfo->density_unit = 0;
+  cinfo->X_density = 1;
+  cinfo->Y_density = 1;
+  cinfo->saw_Adobe_marker = FALSE;
+  cinfo->Adobe_transform = 0;
+
+  cinfo->marker->saw_SOI = TRUE;
+
+  return TRUE;
+}
+
+
+LOCAL(boolean)
+get_sof (j_decompress_ptr cinfo, boolean is_prog, boolean is_arith)
+/* Process a SOFn marker */
+{
+  INT32 length;
+  int c, ci;
+  jpeg_component_info * compptr;
+  INPUT_VARS(cinfo);
+
+  cinfo->progressive_mode = is_prog;
+  cinfo->arith_code = is_arith;
+
+  INPUT_2BYTES(cinfo, length, return FALSE);
+
+  INPUT_BYTE(cinfo, cinfo->data_precision, return FALSE);
+  INPUT_2BYTES(cinfo, cinfo->image_height, return FALSE);
+  INPUT_2BYTES(cinfo, cinfo->image_width, return FALSE);
+  INPUT_BYTE(cinfo, cinfo->num_components, return FALSE);
+
+  length -= 8;
+
+  TRACEMS4(cinfo, 1, JTRC_SOF, cinfo->unread_marker,
+	   (int) cinfo->image_width, (int) cinfo->image_height,
+	   cinfo->num_components);
+
+  if (cinfo->marker->saw_SOF)
+    ERREXIT(cinfo, JERR_SOF_DUPLICATE);
+
+  /* We don't support files in which the image height is initially specified */
+  /* as 0 and is later redefined by DNL.  As long as we have to check that,  */
+  /* might as well have a general sanity check. */
+  if (cinfo->image_height <= 0 || cinfo->image_width <= 0
+      || cinfo->num_components <= 0)
+    ERREXIT(cinfo, JERR_EMPTY_IMAGE);
+
+  if (length != (cinfo->num_components * 3))
+    ERREXIT(cinfo, JERR_BAD_LENGTH);
+
+  if (cinfo->comp_info == NULL)	/* do only once, even if suspend */
+    cinfo->comp_info = (jpeg_component_info *) (*cinfo->mem->alloc_small)
+			((j_common_ptr) cinfo, JPOOL_IMAGE,
+			 cinfo->num_components * SIZEOF(jpeg_component_info));
+  
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    compptr->component_index = ci;
+    INPUT_BYTE(cinfo, compptr->component_id, return FALSE);
+    INPUT_BYTE(cinfo, c, return FALSE);
+    compptr->h_samp_factor = (c >> 4) & 15;
+    compptr->v_samp_factor = (c     ) & 15;
+    INPUT_BYTE(cinfo, compptr->quant_tbl_no, return FALSE);
+
+    TRACEMS4(cinfo, 1, JTRC_SOF_COMPONENT,
+	     compptr->component_id, compptr->h_samp_factor,
+	     compptr->v_samp_factor, compptr->quant_tbl_no);
+  }
+
+  cinfo->marker->saw_SOF = TRUE;
+
+  INPUT_SYNC(cinfo);
+  return TRUE;
+}
+
+
+LOCAL(boolean)
+get_sos (j_decompress_ptr cinfo)
+/* Process a SOS marker */
+{
+  INT32 length;
+  int i, ci, n, c, cc;
+  jpeg_component_info * compptr;
+  INPUT_VARS(cinfo);
+
+  if (! cinfo->marker->saw_SOF)
+    ERREXIT(cinfo, JERR_SOS_NO_SOF);
+
+  INPUT_2BYTES(cinfo, length, return FALSE);
+
+  INPUT_BYTE(cinfo, n, return FALSE); /* Number of components */
+
+  TRACEMS1(cinfo, 1, JTRC_SOS, n);
+
+  if (length != (n * 2 + 6) || n < 1 || n > MAX_COMPS_IN_SCAN)
+    ERREXIT(cinfo, JERR_BAD_LENGTH);
+
+  cinfo->comps_in_scan = n;
+
+  /* Collect the component-spec parameters */
+
+  for (i = 0; i < cinfo->num_components; i++)
+    cinfo->cur_comp_info[i] = NULL;
+
+  for (i = 0; i < n; i++) {
+    INPUT_BYTE(cinfo, cc, return FALSE);
+    INPUT_BYTE(cinfo, c, return FALSE);
+    
+    for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+	 ci++, compptr++) {
+      if (cc == compptr->component_id && !cinfo->cur_comp_info[ci])
+	goto id_found;
+    }
+
+    ERREXIT1(cinfo, JERR_BAD_COMPONENT_ID, cc);
+
+  id_found:
+
+    cinfo->cur_comp_info[i] = compptr;
+    compptr->dc_tbl_no = (c >> 4) & 15;
+    compptr->ac_tbl_no = (c     ) & 15;
+    
+    TRACEMS3(cinfo, 1, JTRC_SOS_COMPONENT, cc,
+	     compptr->dc_tbl_no, compptr->ac_tbl_no);
+  }
+
+  /* Collect the additional scan parameters Ss, Se, Ah/Al. */
+  INPUT_BYTE(cinfo, c, return FALSE);
+  cinfo->Ss = c;
+  INPUT_BYTE(cinfo, c, return FALSE);
+  cinfo->Se = c;
+  INPUT_BYTE(cinfo, c, return FALSE);
+  cinfo->Ah = (c >> 4) & 15;
+  cinfo->Al = (c     ) & 15;
+
+  TRACEMS4(cinfo, 1, JTRC_SOS_PARAMS, cinfo->Ss, cinfo->Se,
+	   cinfo->Ah, cinfo->Al);
+
+  /* Prepare to scan data & restart markers */
+  cinfo->marker->next_restart_num = 0;
+
+  /* Count another SOS marker */
+  cinfo->input_scan_number++;
+
+  INPUT_SYNC(cinfo);
+  return TRUE;
+}
+
+
+#ifdef D_ARITH_CODING_SUPPORTED
+
+LOCAL(boolean)
+get_dac (j_decompress_ptr cinfo)
+/* Process a DAC marker */
+{
+  INT32 length;
+  int index, val;
+  INPUT_VARS(cinfo);
+
+  INPUT_2BYTES(cinfo, length, return FALSE);
+  length -= 2;
+  
+  while (length > 0) {
+    INPUT_BYTE(cinfo, index, return FALSE);
+    INPUT_BYTE(cinfo, val, return FALSE);
+
+    length -= 2;
+
+    TRACEMS2(cinfo, 1, JTRC_DAC, index, val);
+
+    if (index < 0 || index >= (2*NUM_ARITH_TBLS))
+      ERREXIT1(cinfo, JERR_DAC_INDEX, index);
+
+    if (index >= NUM_ARITH_TBLS) { /* define AC table */
+      cinfo->arith_ac_K[index-NUM_ARITH_TBLS] = (UINT8) val;
+    } else {			/* define DC table */
+      cinfo->arith_dc_L[index] = (UINT8) (val & 0x0F);
+      cinfo->arith_dc_U[index] = (UINT8) (val >> 4);
+      if (cinfo->arith_dc_L[index] > cinfo->arith_dc_U[index])
+	ERREXIT1(cinfo, JERR_DAC_VALUE, val);
+    }
+  }
+
+  if (length != 0)
+    ERREXIT(cinfo, JERR_BAD_LENGTH);
+
+  INPUT_SYNC(cinfo);
+  return TRUE;
+}
+
+#else /* ! D_ARITH_CODING_SUPPORTED */
+
+#define get_dac(cinfo)  skip_variable(cinfo)
+
+#endif /* D_ARITH_CODING_SUPPORTED */
+
+
+LOCAL(boolean)
+get_dht (j_decompress_ptr cinfo)
+/* Process a DHT marker */
+{
+  INT32 length;
+  UINT8 bits[17];
+  UINT8 huffval[256];
+  int i, index, count;
+  JHUFF_TBL **htblptr;
+  INPUT_VARS(cinfo);
+
+  INPUT_2BYTES(cinfo, length, return FALSE);
+  length -= 2;
+  
+  while (length > 16) {
+    INPUT_BYTE(cinfo, index, return FALSE);
+
+    TRACEMS1(cinfo, 1, JTRC_DHT, index);
+      
+    bits[0] = 0;
+    count = 0;
+    for (i = 1; i <= 16; i++) {
+      INPUT_BYTE(cinfo, bits[i], return FALSE);
+      count += bits[i];
+    }
+
+    length -= 1 + 16;
+
+    TRACEMS8(cinfo, 2, JTRC_HUFFBITS,
+	     bits[1], bits[2], bits[3], bits[4],
+	     bits[5], bits[6], bits[7], bits[8]);
+    TRACEMS8(cinfo, 2, JTRC_HUFFBITS,
+	     bits[9], bits[10], bits[11], bits[12],
+	     bits[13], bits[14], bits[15], bits[16]);
+
+    /* Here we just do minimal validation of the counts to avoid walking
+     * off the end of our table space.  jdhuff.c will check more carefully.
+     */
+    if (count > 256 || ((INT32) count) > length)
+      ERREXIT(cinfo, JERR_BAD_HUFF_TABLE);
+
+    for (i = 0; i < count; i++)
+      INPUT_BYTE(cinfo, huffval[i], return FALSE);
+
+    length -= count;
+
+    if (index & 0x10) {		/* AC table definition */
+      index -= 0x10;
+      htblptr = &cinfo->ac_huff_tbl_ptrs[index];
+    } else {			/* DC table definition */
+      htblptr = &cinfo->dc_huff_tbl_ptrs[index];
+    }
+
+    if (index < 0 || index >= NUM_HUFF_TBLS)
+      ERREXIT1(cinfo, JERR_DHT_INDEX, index);
+
+    if (*htblptr == NULL)
+      *htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo);
+  
+    MEMCOPY((*htblptr)->bits, bits, SIZEOF((*htblptr)->bits));
+    MEMCOPY((*htblptr)->huffval, huffval, SIZEOF((*htblptr)->huffval));
+  }
+
+  if (length != 0)
+    ERREXIT(cinfo, JERR_BAD_LENGTH);
+
+  INPUT_SYNC(cinfo);
+  return TRUE;
+}
+
+
+LOCAL(boolean)
+get_dqt (j_decompress_ptr cinfo)
+/* Process a DQT marker */
+{
+  INT32 length;
+  int n, i, prec;
+  unsigned int tmp;
+  JQUANT_TBL *quant_ptr;
+  INPUT_VARS(cinfo);
+
+  INPUT_2BYTES(cinfo, length, return FALSE);
+  length -= 2;
+
+  while (length > 0) {
+    INPUT_BYTE(cinfo, n, return FALSE);
+    prec = n >> 4;
+    n &= 0x0F;
+
+    TRACEMS2(cinfo, 1, JTRC_DQT, n, prec);
+
+    if (n >= NUM_QUANT_TBLS)
+      ERREXIT1(cinfo, JERR_DQT_INDEX, n);
+      
+    if (cinfo->quant_tbl_ptrs[n] == NULL)
+      cinfo->quant_tbl_ptrs[n] = jpeg_alloc_quant_table((j_common_ptr) cinfo);
+    quant_ptr = cinfo->quant_tbl_ptrs[n];
+
+    for (i = 0; i < DCTSIZE2; i++) {
+      if (prec)
+	INPUT_2BYTES(cinfo, tmp, return FALSE);
+      else
+	INPUT_BYTE(cinfo, tmp, return FALSE);
+      /* We convert the zigzag-order table to natural array order. */
+      quant_ptr->quantval[jpeg_natural_order[i]] = (UINT16) tmp;
+    }
+
+    if (cinfo->err->trace_level >= 2) {
+      for (i = 0; i < DCTSIZE2; i += 8) {
+	TRACEMS8(cinfo, 2, JTRC_QUANTVALS,
+		 quant_ptr->quantval[i],   quant_ptr->quantval[i+1],
+		 quant_ptr->quantval[i+2], quant_ptr->quantval[i+3],
+		 quant_ptr->quantval[i+4], quant_ptr->quantval[i+5],
+		 quant_ptr->quantval[i+6], quant_ptr->quantval[i+7]);
+      }
+    }
+
+    length -= DCTSIZE2+1;
+    if (prec) length -= DCTSIZE2;
+  }
+
+  if (length != 0)
+    ERREXIT(cinfo, JERR_BAD_LENGTH);
+
+  INPUT_SYNC(cinfo);
+  return TRUE;
+}
+
+
+LOCAL(boolean)
+get_dri (j_decompress_ptr cinfo)
+/* Process a DRI marker */
+{
+  INT32 length;
+  unsigned int tmp;
+  INPUT_VARS(cinfo);
+
+  INPUT_2BYTES(cinfo, length, return FALSE);
+  
+  if (length != 4)
+    ERREXIT(cinfo, JERR_BAD_LENGTH);
+
+  INPUT_2BYTES(cinfo, tmp, return FALSE);
+
+  TRACEMS1(cinfo, 1, JTRC_DRI, tmp);
+
+  cinfo->restart_interval = tmp;
+
+  INPUT_SYNC(cinfo);
+  return TRUE;
+}
+
+
+/*
+ * Routines for processing APPn and COM markers.
+ * These are either saved in memory or discarded, per application request.
+ * APP0 and APP14 are specially checked to see if they are
+ * JFIF and Adobe markers, respectively.
+ */
+
+#define APP0_DATA_LEN	14	/* Length of interesting data in APP0 */
+#define APP14_DATA_LEN	12	/* Length of interesting data in APP14 */
+#define APPN_DATA_LEN	14	/* Must be the largest of the above!! */
+
+
+LOCAL(void)
+examine_app0 (j_decompress_ptr cinfo, JOCTET FAR * data,
+	      unsigned int datalen, INT32 remaining)
+/* Examine first few bytes from an APP0.
+ * Take appropriate action if it is a JFIF marker.
+ * datalen is # of bytes at data[], remaining is length of rest of marker data.
+ */
+{
+  INT32 totallen = (INT32) datalen + remaining;
+
+  if (datalen >= APP0_DATA_LEN &&
+      GETJOCTET(data[0]) == 0x4A &&
+      GETJOCTET(data[1]) == 0x46 &&
+      GETJOCTET(data[2]) == 0x49 &&
+      GETJOCTET(data[3]) == 0x46 &&
+      GETJOCTET(data[4]) == 0) {
+    /* Found JFIF APP0 marker: save info */
+    cinfo->saw_JFIF_marker = TRUE;
+    cinfo->JFIF_major_version = GETJOCTET(data[5]);
+    cinfo->JFIF_minor_version = GETJOCTET(data[6]);
+    cinfo->density_unit = GETJOCTET(data[7]);
+    cinfo->X_density = (GETJOCTET(data[8]) << 8) + GETJOCTET(data[9]);
+    cinfo->Y_density = (GETJOCTET(data[10]) << 8) + GETJOCTET(data[11]);
+    /* Check version.
+     * Major version must be 1, anything else signals an incompatible change.
+     * (We used to treat this as an error, but now it's a nonfatal warning,
+     * because some bozo at Hijaak couldn't read the spec.)
+     * Minor version should be 0..2, but process anyway if newer.
+     */
+    if (cinfo->JFIF_major_version != 1)
+      WARNMS2(cinfo, JWRN_JFIF_MAJOR,
+	      cinfo->JFIF_major_version, cinfo->JFIF_minor_version);
+    /* Generate trace messages */
+    TRACEMS5(cinfo, 1, JTRC_JFIF,
+	     cinfo->JFIF_major_version, cinfo->JFIF_minor_version,
+	     cinfo->X_density, cinfo->Y_density, cinfo->density_unit);
+    /* Validate thumbnail dimensions and issue appropriate messages */
+    if (GETJOCTET(data[12]) | GETJOCTET(data[13]))
+      TRACEMS2(cinfo, 1, JTRC_JFIF_THUMBNAIL,
+	       GETJOCTET(data[12]), GETJOCTET(data[13]));
+    totallen -= APP0_DATA_LEN;
+    if (totallen !=
+	((INT32)GETJOCTET(data[12]) * (INT32)GETJOCTET(data[13]) * (INT32) 3))
+      TRACEMS1(cinfo, 1, JTRC_JFIF_BADTHUMBNAILSIZE, (int) totallen);
+  } else if (datalen >= 6 &&
+      GETJOCTET(data[0]) == 0x4A &&
+      GETJOCTET(data[1]) == 0x46 &&
+      GETJOCTET(data[2]) == 0x58 &&
+      GETJOCTET(data[3]) == 0x58 &&
+      GETJOCTET(data[4]) == 0) {
+    /* Found JFIF "JFXX" extension APP0 marker */
+    /* The library doesn't actually do anything with these,
+     * but we try to produce a helpful trace message.
+     */
+    switch (GETJOCTET(data[5])) {
+    case 0x10:
+      TRACEMS1(cinfo, 1, JTRC_THUMB_JPEG, (int) totallen);
+      break;
+    case 0x11:
+      TRACEMS1(cinfo, 1, JTRC_THUMB_PALETTE, (int) totallen);
+      break;
+    case 0x13:
+      TRACEMS1(cinfo, 1, JTRC_THUMB_RGB, (int) totallen);
+      break;
+    default:
+      TRACEMS2(cinfo, 1, JTRC_JFIF_EXTENSION,
+	       GETJOCTET(data[5]), (int) totallen);
+      break;
+    }
+  } else {
+    /* Start of APP0 does not match "JFIF" or "JFXX", or too short */
+    TRACEMS1(cinfo, 1, JTRC_APP0, (int) totallen);
+  }
+}
+
+
+LOCAL(void)
+examine_app14 (j_decompress_ptr cinfo, JOCTET FAR * data,
+	       unsigned int datalen, INT32 remaining)
+/* Examine first few bytes from an APP14.
+ * Take appropriate action if it is an Adobe marker.
+ * datalen is # of bytes at data[], remaining is length of rest of marker data.
+ */
+{
+  unsigned int version, flags0, flags1, transform;
+
+  if (datalen >= APP14_DATA_LEN &&
+      GETJOCTET(data[0]) == 0x41 &&
+      GETJOCTET(data[1]) == 0x64 &&
+      GETJOCTET(data[2]) == 0x6F &&
+      GETJOCTET(data[3]) == 0x62 &&
+      GETJOCTET(data[4]) == 0x65) {
+    /* Found Adobe APP14 marker */
+    version = (GETJOCTET(data[5]) << 8) + GETJOCTET(data[6]);
+    flags0 = (GETJOCTET(data[7]) << 8) + GETJOCTET(data[8]);
+    flags1 = (GETJOCTET(data[9]) << 8) + GETJOCTET(data[10]);
+    transform = GETJOCTET(data[11]);
+    TRACEMS4(cinfo, 1, JTRC_ADOBE, version, flags0, flags1, transform);
+    cinfo->saw_Adobe_marker = TRUE;
+    cinfo->Adobe_transform = (UINT8) transform;
+  } else {
+    /* Start of APP14 does not match "Adobe", or too short */
+    TRACEMS1(cinfo, 1, JTRC_APP14, (int) (datalen + remaining));
+  }
+}
+
+
+METHODDEF(boolean)
+get_interesting_appn (j_decompress_ptr cinfo)
+/* Process an APP0 or APP14 marker without saving it */
+{
+  INT32 length;
+  JOCTET b[APPN_DATA_LEN];
+  unsigned int i, numtoread;
+  INPUT_VARS(cinfo);
+
+  INPUT_2BYTES(cinfo, length, return FALSE);
+  length -= 2;
+
+  /* get the interesting part of the marker data */
+  if (length >= APPN_DATA_LEN)
+    numtoread = APPN_DATA_LEN;
+  else if (length > 0)
+    numtoread = (unsigned int) length;
+  else
+    numtoread = 0;
+  for (i = 0; i < numtoread; i++)
+    INPUT_BYTE(cinfo, b[i], return FALSE);
+  length -= numtoread;
+
+  /* process it */
+  switch (cinfo->unread_marker) {
+  case M_APP0:
+    examine_app0(cinfo, (JOCTET FAR *) b, numtoread, length);
+    break;
+  case M_APP14:
+    examine_app14(cinfo, (JOCTET FAR *) b, numtoread, length);
+    break;
+  default:
+    /* can't get here unless jpeg_save_markers chooses wrong processor */
+    ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, cinfo->unread_marker);
+    break;
+  }
+
+  /* skip any remaining data -- could be lots */
+  INPUT_SYNC(cinfo);
+  if (length > 0)
+    (*cinfo->src->skip_input_data) (cinfo, (long) length);
+
+  return TRUE;
+}
+
+
+#ifdef SAVE_MARKERS_SUPPORTED
+
+METHODDEF(boolean)
+save_marker (j_decompress_ptr cinfo)
+/* Save an APPn or COM marker into the marker list */
+{
+  my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
+  jpeg_saved_marker_ptr cur_marker = marker->cur_marker;
+  unsigned int bytes_read, data_length;
+  JOCTET FAR * data;
+  INT32 length = 0;
+  INPUT_VARS(cinfo);
+
+  if (cur_marker == NULL) {
+    /* begin reading a marker */
+    INPUT_2BYTES(cinfo, length, return FALSE);
+    length -= 2;
+    if (length >= 0) {		/* watch out for bogus length word */
+      /* figure out how much we want to save */
+      unsigned int limit;
+      if (cinfo->unread_marker == (int) M_COM)
+	limit = marker->length_limit_COM;
+      else
+	limit = marker->length_limit_APPn[cinfo->unread_marker - (int) M_APP0];
+      if ((unsigned int) length < limit)
+	limit = (unsigned int) length;
+      /* allocate and initialize the marker item */
+      cur_marker = (jpeg_saved_marker_ptr)
+	(*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				    SIZEOF(struct jpeg_marker_struct) + limit);
+      cur_marker->next = NULL;
+      cur_marker->marker = (UINT8) cinfo->unread_marker;
+      cur_marker->original_length = (unsigned int) length;
+      cur_marker->data_length = limit;
+      /* data area is just beyond the jpeg_marker_struct */
+      data = cur_marker->data = (JOCTET FAR *) (cur_marker + 1);
+      marker->cur_marker = cur_marker;
+      marker->bytes_read = 0;
+      bytes_read = 0;
+      data_length = limit;
+    } else {
+      /* deal with bogus length word */
+      bytes_read = data_length = 0;
+      data = NULL;
+    }
+  } else {
+    /* resume reading a marker */
+    bytes_read = marker->bytes_read;
+    data_length = cur_marker->data_length;
+    data = cur_marker->data + bytes_read;
+  }
+
+  while (bytes_read < data_length) {
+    INPUT_SYNC(cinfo);		/* move the restart point to here */
+    marker->bytes_read = bytes_read;
+    /* If there's not at least one byte in buffer, suspend */
+    MAKE_BYTE_AVAIL(cinfo, return FALSE);
+    /* Copy bytes with reasonable rapidity */
+    while (bytes_read < data_length && bytes_in_buffer > 0) {
+      *data++ = *next_input_byte++;
+      bytes_in_buffer--;
+      bytes_read++;
+    }
+  }
+
+  /* Done reading what we want to read */
+  if (cur_marker != NULL) {	/* will be NULL if bogus length word */
+    /* Add new marker to end of list */
+    if (cinfo->marker_list == NULL) {
+      cinfo->marker_list = cur_marker;
+    } else {
+      jpeg_saved_marker_ptr prev = cinfo->marker_list;
+      while (prev->next != NULL)
+	prev = prev->next;
+      prev->next = cur_marker;
+    }
+    /* Reset pointer & calc remaining data length */
+    data = cur_marker->data;
+    length = cur_marker->original_length - data_length;
+  }
+  /* Reset to initial state for next marker */
+  marker->cur_marker = NULL;
+
+  /* Process the marker if interesting; else just make a generic trace msg */
+  switch (cinfo->unread_marker) {
+  case M_APP0:
+    examine_app0(cinfo, data, data_length, length);
+    break;
+  case M_APP14:
+    examine_app14(cinfo, data, data_length, length);
+    break;
+  default:
+    TRACEMS2(cinfo, 1, JTRC_MISC_MARKER, cinfo->unread_marker,
+	     (int) (data_length + length));
+    break;
+  }
+
+  /* skip any remaining data -- could be lots */
+  INPUT_SYNC(cinfo);		/* do before skip_input_data */
+  if (length > 0)
+    (*cinfo->src->skip_input_data) (cinfo, (long) length);
+
+  return TRUE;
+}
+
+#endif /* SAVE_MARKERS_SUPPORTED */
+
+
+METHODDEF(boolean)
+skip_variable (j_decompress_ptr cinfo)
+/* Skip over an unknown or uninteresting variable-length marker */
+{
+  INT32 length;
+  INPUT_VARS(cinfo);
+
+  INPUT_2BYTES(cinfo, length, return FALSE);
+  length -= 2;
+  
+  TRACEMS2(cinfo, 1, JTRC_MISC_MARKER, cinfo->unread_marker, (int) length);
+
+  INPUT_SYNC(cinfo);		/* do before skip_input_data */
+  if (length > 0)
+    (*cinfo->src->skip_input_data) (cinfo, (long) length);
+
+  return TRUE;
+}
+
+
+/*
+ * Find the next JPEG marker, save it in cinfo->unread_marker.
+ * Returns FALSE if had to suspend before reaching a marker;
+ * in that case cinfo->unread_marker is unchanged.
+ *
+ * Note that the result might not be a valid marker code,
+ * but it will never be 0 or FF.
+ */
+
+LOCAL(boolean)
+next_marker (j_decompress_ptr cinfo)
+{
+  int c;
+  INPUT_VARS(cinfo);
+
+  for (;;) {
+    INPUT_BYTE(cinfo, c, return FALSE);
+    /* Skip any non-FF bytes.
+     * This may look a bit inefficient, but it will not occur in a valid file.
+     * We sync after each discarded byte so that a suspending data source
+     * can discard the byte from its buffer.
+     */
+    while (c != 0xFF) {
+      cinfo->marker->discarded_bytes++;
+      INPUT_SYNC(cinfo);
+      INPUT_BYTE(cinfo, c, return FALSE);
+    }
+    /* This loop swallows any duplicate FF bytes.  Extra FFs are legal as
+     * pad bytes, so don't count them in discarded_bytes.  We assume there
+     * will not be so many consecutive FF bytes as to overflow a suspending
+     * data source's input buffer.
+     */
+    do {
+      INPUT_BYTE(cinfo, c, return FALSE);
+    } while (c == 0xFF);
+    if (c != 0)
+      break;			/* found a valid marker, exit loop */
+    /* Reach here if we found a stuffed-zero data sequence (FF/00).
+     * Discard it and loop back to try again.
+     */
+    cinfo->marker->discarded_bytes += 2;
+    INPUT_SYNC(cinfo);
+  }
+
+  if (cinfo->marker->discarded_bytes != 0) {
+    WARNMS2(cinfo, JWRN_EXTRANEOUS_DATA, cinfo->marker->discarded_bytes, c);
+    cinfo->marker->discarded_bytes = 0;
+  }
+
+  cinfo->unread_marker = c;
+
+  INPUT_SYNC(cinfo);
+  return TRUE;
+}
+
+
+LOCAL(boolean)
+first_marker (j_decompress_ptr cinfo)
+/* Like next_marker, but used to obtain the initial SOI marker. */
+/* For this marker, we do not allow preceding garbage or fill; otherwise,
+ * we might well scan an entire input file before realizing it ain't JPEG.
+ * If an application wants to process non-JFIF files, it must seek to the
+ * SOI before calling the JPEG library.
+ */
+{
+  int c, c2;
+  INPUT_VARS(cinfo);
+
+  INPUT_BYTE(cinfo, c, return FALSE);
+  INPUT_BYTE(cinfo, c2, return FALSE);
+  if (c != 0xFF || c2 != (int) M_SOI)
+    ERREXIT2(cinfo, JERR_NO_SOI, c, c2);
+
+  cinfo->unread_marker = c2;
+
+  INPUT_SYNC(cinfo);
+  return TRUE;
+}
+
+
+/*
+ * Read markers until SOS or EOI.
+ *
+ * Returns same codes as are defined for jpeg_consume_input:
+ * JPEG_SUSPENDED, JPEG_REACHED_SOS, or JPEG_REACHED_EOI.
+ */
+
+METHODDEF(int)
+read_markers (j_decompress_ptr cinfo)
+{
+  /* Outer loop repeats once for each marker. */
+  for (;;) {
+    /* Collect the marker proper, unless we already did. */
+    /* NB: first_marker() enforces the requirement that SOI appear first. */
+    if (cinfo->unread_marker == 0) {
+      if (! cinfo->marker->saw_SOI) {
+	if (! first_marker(cinfo))
+	  return JPEG_SUSPENDED;
+      } else {
+	if (! next_marker(cinfo))
+	  return JPEG_SUSPENDED;
+      }
+    }
+    /* At this point cinfo->unread_marker contains the marker code and the
+     * input point is just past the marker proper, but before any parameters.
+     * A suspension will cause us to return with this state still true.
+     */
+    switch (cinfo->unread_marker) {
+    case M_SOI:
+      if (! get_soi(cinfo))
+	return JPEG_SUSPENDED;
+      break;
+
+    case M_SOF0:		/* Baseline */
+    case M_SOF1:		/* Extended sequential, Huffman */
+      if (! get_sof(cinfo, FALSE, FALSE))
+	return JPEG_SUSPENDED;
+      break;
+
+    case M_SOF2:		/* Progressive, Huffman */
+      if (! get_sof(cinfo, TRUE, FALSE))
+	return JPEG_SUSPENDED;
+      break;
+
+    case M_SOF9:		/* Extended sequential, arithmetic */
+      if (! get_sof(cinfo, FALSE, TRUE))
+	return JPEG_SUSPENDED;
+      break;
+
+    case M_SOF10:		/* Progressive, arithmetic */
+      if (! get_sof(cinfo, TRUE, TRUE))
+	return JPEG_SUSPENDED;
+      break;
+
+    /* Currently unsupported SOFn types */
+    case M_SOF3:		/* Lossless, Huffman */
+    case M_SOF5:		/* Differential sequential, Huffman */
+    case M_SOF6:		/* Differential progressive, Huffman */
+    case M_SOF7:		/* Differential lossless, Huffman */
+    case M_JPG:			/* Reserved for JPEG extensions */
+    case M_SOF11:		/* Lossless, arithmetic */
+    case M_SOF13:		/* Differential sequential, arithmetic */
+    case M_SOF14:		/* Differential progressive, arithmetic */
+    case M_SOF15:		/* Differential lossless, arithmetic */
+      ERREXIT1(cinfo, JERR_SOF_UNSUPPORTED, cinfo->unread_marker);
+      break;
+
+    case M_SOS:
+      if (! get_sos(cinfo))
+	return JPEG_SUSPENDED;
+      cinfo->unread_marker = 0;	/* processed the marker */
+      return JPEG_REACHED_SOS;
+    
+    case M_EOI:
+      TRACEMS(cinfo, 1, JTRC_EOI);
+      cinfo->unread_marker = 0;	/* processed the marker */
+      return JPEG_REACHED_EOI;
+      
+    case M_DAC:
+      if (! get_dac(cinfo))
+	return JPEG_SUSPENDED;
+      break;
+      
+    case M_DHT:
+      if (! get_dht(cinfo))
+	return JPEG_SUSPENDED;
+      break;
+      
+    case M_DQT:
+      if (! get_dqt(cinfo))
+	return JPEG_SUSPENDED;
+      break;
+      
+    case M_DRI:
+      if (! get_dri(cinfo))
+	return JPEG_SUSPENDED;
+      break;
+      
+    case M_APP0:
+    case M_APP1:
+    case M_APP2:
+    case M_APP3:
+    case M_APP4:
+    case M_APP5:
+    case M_APP6:
+    case M_APP7:
+    case M_APP8:
+    case M_APP9:
+    case M_APP10:
+    case M_APP11:
+    case M_APP12:
+    case M_APP13:
+    case M_APP14:
+    case M_APP15:
+      if (! (*((my_marker_ptr) cinfo->marker)->process_APPn[
+		cinfo->unread_marker - (int) M_APP0]) (cinfo))
+	return JPEG_SUSPENDED;
+      break;
+      
+    case M_COM:
+      if (! (*((my_marker_ptr) cinfo->marker)->process_COM) (cinfo))
+	return JPEG_SUSPENDED;
+      break;
+
+    case M_RST0:		/* these are all parameterless */
+    case M_RST1:
+    case M_RST2:
+    case M_RST3:
+    case M_RST4:
+    case M_RST5:
+    case M_RST6:
+    case M_RST7:
+    case M_TEM:
+      TRACEMS1(cinfo, 1, JTRC_PARMLESS_MARKER, cinfo->unread_marker);
+      break;
+
+    case M_DNL:			/* Ignore DNL ... perhaps the wrong thing */
+      if (! skip_variable(cinfo))
+	return JPEG_SUSPENDED;
+      break;
+
+    default:			/* must be DHP, EXP, JPGn, or RESn */
+      /* For now, we treat the reserved markers as fatal errors since they are
+       * likely to be used to signal incompatible JPEG Part 3 extensions.
+       * Once the JPEG 3 version-number marker is well defined, this code
+       * ought to change!
+       */
+      ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, cinfo->unread_marker);
+      break;
+    }
+    /* Successfully processed marker, so reset state variable */
+    cinfo->unread_marker = 0;
+  } /* end loop */
+}
+
+
+/*
+ * Read a restart marker, which is expected to appear next in the datastream;
+ * if the marker is not there, take appropriate recovery action.
+ * Returns FALSE if suspension is required.
+ *
+ * This is called by the entropy decoder after it has read an appropriate
+ * number of MCUs.  cinfo->unread_marker may be nonzero if the entropy decoder
+ * has already read a marker from the data source.  Under normal conditions
+ * cinfo->unread_marker will be reset to 0 before returning; if not reset,
+ * it holds a marker which the decoder will be unable to read past.
+ */
+
+METHODDEF(boolean)
+read_restart_marker (j_decompress_ptr cinfo)
+{
+  /* Obtain a marker unless we already did. */
+  /* Note that next_marker will complain if it skips any data. */
+  if (cinfo->unread_marker == 0) {
+    if (! next_marker(cinfo))
+      return FALSE;
+  }
+
+  if (cinfo->unread_marker ==
+      ((int) M_RST0 + cinfo->marker->next_restart_num)) {
+    /* Normal case --- swallow the marker and let entropy decoder continue */
+    TRACEMS1(cinfo, 3, JTRC_RST, cinfo->marker->next_restart_num);
+    cinfo->unread_marker = 0;
+  } else {
+    /* Uh-oh, the restart markers have been messed up. */
+    /* Let the data source manager determine how to resync. */
+    if (! (*cinfo->src->resync_to_restart) (cinfo,
+					    cinfo->marker->next_restart_num))
+      return FALSE;
+  }
+
+  /* Update next-restart state */
+  cinfo->marker->next_restart_num = (cinfo->marker->next_restart_num + 1) & 7;
+
+  return TRUE;
+}
+
+
+/*
+ * This is the default resync_to_restart method for data source managers
+ * to use if they don't have any better approach.  Some data source managers
+ * may be able to back up, or may have additional knowledge about the data
+ * which permits a more intelligent recovery strategy; such managers would
+ * presumably supply their own resync method.
+ *
+ * read_restart_marker calls resync_to_restart if it finds a marker other than
+ * the restart marker it was expecting.  (This code is *not* used unless
+ * a nonzero restart interval has been declared.)  cinfo->unread_marker is
+ * the marker code actually found (might be anything, except 0 or FF).
+ * The desired restart marker number (0..7) is passed as a parameter.
+ * This routine is supposed to apply whatever error recovery strategy seems
+ * appropriate in order to position the input stream to the next data segment.
+ * Note that cinfo->unread_marker is treated as a marker appearing before
+ * the current data-source input point; usually it should be reset to zero
+ * before returning.
+ * Returns FALSE if suspension is required.
+ *
+ * This implementation is substantially constrained by wanting to treat the
+ * input as a data stream; this means we can't back up.  Therefore, we have
+ * only the following actions to work with:
+ *   1. Simply discard the marker and let the entropy decoder resume at next
+ *      byte of file.
+ *   2. Read forward until we find another marker, discarding intervening
+ *      data.  (In theory we could look ahead within the current bufferload,
+ *      without having to discard data if we don't find the desired marker.
+ *      This idea is not implemented here, in part because it makes behavior
+ *      dependent on buffer size and chance buffer-boundary positions.)
+ *   3. Leave the marker unread (by failing to zero cinfo->unread_marker).
+ *      This will cause the entropy decoder to process an empty data segment,
+ *      inserting dummy zeroes, and then we will reprocess the marker.
+ *
+ * #2 is appropriate if we think the desired marker lies ahead, while #3 is
+ * appropriate if the found marker is a future restart marker (indicating
+ * that we have missed the desired restart marker, probably because it got
+ * corrupted).
+ * We apply #2 or #3 if the found marker is a restart marker no more than
+ * two counts behind or ahead of the expected one.  We also apply #2 if the
+ * found marker is not a legal JPEG marker code (it's certainly bogus data).
+ * If the found marker is a restart marker more than 2 counts away, we do #1
+ * (too much risk that the marker is erroneous; with luck we will be able to
+ * resync at some future point).
+ * For any valid non-restart JPEG marker, we apply #3.  This keeps us from
+ * overrunning the end of a scan.  An implementation limited to single-scan
+ * files might find it better to apply #2 for markers other than EOI, since
+ * any other marker would have to be bogus data in that case.
+ */
+
+GLOBAL(boolean)
+jpeg_resync_to_restart (j_decompress_ptr cinfo, int desired)
+{
+  int marker = cinfo->unread_marker;
+  int action = 1;
+  
+  /* Always put up a warning. */
+  WARNMS2(cinfo, JWRN_MUST_RESYNC, marker, desired);
+  
+  /* Outer loop handles repeated decision after scanning forward. */
+  for (;;) {
+    if (marker < (int) M_SOF0)
+      action = 2;		/* invalid marker */
+    else if (marker < (int) M_RST0 || marker > (int) M_RST7)
+      action = 3;		/* valid non-restart marker */
+    else {
+      if (marker == ((int) M_RST0 + ((desired+1) & 7)) ||
+	  marker == ((int) M_RST0 + ((desired+2) & 7)))
+	action = 3;		/* one of the next two expected restarts */
+      else if (marker == ((int) M_RST0 + ((desired-1) & 7)) ||
+	       marker == ((int) M_RST0 + ((desired-2) & 7)))
+	action = 2;		/* a prior restart, so advance */
+      else
+	action = 1;		/* desired restart or too far away */
+    }
+    TRACEMS2(cinfo, 4, JTRC_RECOVERY_ACTION, marker, action);
+    switch (action) {
+    case 1:
+      /* Discard marker and let entropy decoder resume processing. */
+      cinfo->unread_marker = 0;
+      return TRUE;
+    case 2:
+      /* Scan to the next marker, and repeat the decision loop. */
+      if (! next_marker(cinfo))
+	return FALSE;
+      marker = cinfo->unread_marker;
+      break;
+    case 3:
+      /* Return without advancing past this marker. */
+      /* Entropy decoder will be forced to process an empty segment. */
+      return TRUE;
+    }
+  } /* end loop */
+}
+
+
+/*
+ * Reset marker processing state to begin a fresh datastream.
+ */
+
+METHODDEF(void)
+reset_marker_reader (j_decompress_ptr cinfo)
+{
+  my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
+
+  cinfo->comp_info = NULL;		/* until allocated by get_sof */
+  cinfo->input_scan_number = 0;		/* no SOS seen yet */
+  cinfo->unread_marker = 0;		/* no pending marker */
+  marker->pub.saw_SOI = FALSE;		/* set internal state too */
+  marker->pub.saw_SOF = FALSE;
+  marker->pub.discarded_bytes = 0;
+  marker->cur_marker = NULL;
+}
+
+
+/*
+ * Initialize the marker reader module.
+ * This is called only once, when the decompression object is created.
+ */
+
+GLOBAL(void)
+jinit_marker_reader (j_decompress_ptr cinfo)
+{
+  my_marker_ptr marker;
+  int i;
+
+  /* Create subobject in permanent pool */
+  marker = (my_marker_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
+				SIZEOF(my_marker_reader));
+  cinfo->marker = (struct jpeg_marker_reader *) marker;
+  /* Initialize public method pointers */
+  marker->pub.reset_marker_reader = reset_marker_reader;
+  marker->pub.read_markers = read_markers;
+  marker->pub.read_restart_marker = read_restart_marker;
+  /* Initialize COM/APPn processing.
+   * By default, we examine and then discard APP0 and APP14,
+   * but simply discard COM and all other APPn.
+   */
+  marker->process_COM = skip_variable;
+  marker->length_limit_COM = 0;
+  for (i = 0; i < 16; i++) {
+    marker->process_APPn[i] = skip_variable;
+    marker->length_limit_APPn[i] = 0;
+  }
+  marker->process_APPn[0] = get_interesting_appn;
+  marker->process_APPn[14] = get_interesting_appn;
+  /* Reset marker processing state */
+  reset_marker_reader(cinfo);
+}
+
+
+/*
+ * Control saving of COM and APPn markers into marker_list.
+ */
+
+#ifdef SAVE_MARKERS_SUPPORTED
+
+GLOBAL(void)
+jpeg_save_markers (j_decompress_ptr cinfo, int marker_code,
+		   unsigned int length_limit)
+{
+  my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
+  long maxlength;
+  jpeg_marker_parser_method processor;
+
+  /* Length limit mustn't be larger than what we can allocate
+   * (should only be a concern in a 16-bit environment).
+   */
+  maxlength = cinfo->mem->max_alloc_chunk - SIZEOF(struct jpeg_marker_struct);
+  if (((long) length_limit) > maxlength)
+    length_limit = (unsigned int) maxlength;
+
+  /* Choose processor routine to use.
+   * APP0/APP14 have special requirements.
+   */
+  if (length_limit) {
+    processor = save_marker;
+    /* If saving APP0/APP14, save at least enough for our internal use. */
+    if (marker_code == (int) M_APP0 && length_limit < APP0_DATA_LEN)
+      length_limit = APP0_DATA_LEN;
+    else if (marker_code == (int) M_APP14 && length_limit < APP14_DATA_LEN)
+      length_limit = APP14_DATA_LEN;
+  } else {
+    processor = skip_variable;
+    /* If discarding APP0/APP14, use our regular on-the-fly processor. */
+    if (marker_code == (int) M_APP0 || marker_code == (int) M_APP14)
+      processor = get_interesting_appn;
+  }
+
+  if (marker_code == (int) M_COM) {
+    marker->process_COM = processor;
+    marker->length_limit_COM = length_limit;
+  } else if (marker_code >= (int) M_APP0 && marker_code <= (int) M_APP15) {
+    marker->process_APPn[marker_code - (int) M_APP0] = processor;
+    marker->length_limit_APPn[marker_code - (int) M_APP0] = length_limit;
+  } else
+    ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, marker_code);
+}
+
+#endif /* SAVE_MARKERS_SUPPORTED */
+
+
+/*
+ * Install a special processing method for COM or APPn markers.
+ */
+
+GLOBAL(void)
+jpeg_set_marker_processor (j_decompress_ptr cinfo, int marker_code,
+			   jpeg_marker_parser_method routine)
+{
+  my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
+
+  if (marker_code == (int) M_COM)
+    marker->process_COM = routine;
+  else if (marker_code >= (int) M_APP0 && marker_code <= (int) M_APP15)
+    marker->process_APPn[marker_code - (int) M_APP0] = routine;
+  else
+    ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, marker_code);
+}
diff --git a/src/libjpeg-turbo/jdmaster.c b/src/libjpeg-turbo/jdmaster.c
new file mode 100644
index 0000000..c73ec02
--- /dev/null
+++ b/src/libjpeg-turbo/jdmaster.c
@@ -0,0 +1,601 @@
+/*
+ * jdmaster.c
+ *
+ * Copyright (C) 1991-1997, Thomas G. Lane.
+ * Copyright (C) 2009-2011, D. R. Commander.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains master control logic for the JPEG decompressor.
+ * These routines are concerned with selecting the modules to be executed
+ * and with determining the number of passes and the work to be done in each
+ * pass.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jpegcomp.h"
+
+
+/* Private state */
+
+typedef struct {
+  struct jpeg_decomp_master pub; /* public fields */
+
+  int pass_number;		/* # of passes completed */
+
+  boolean using_merged_upsample; /* TRUE if using merged upsample/cconvert */
+
+  /* Saved references to initialized quantizer modules,
+   * in case we need to switch modes.
+   */
+  struct jpeg_color_quantizer * quantizer_1pass;
+  struct jpeg_color_quantizer * quantizer_2pass;
+} my_decomp_master;
+
+typedef my_decomp_master * my_master_ptr;
+
+
+/*
+ * Determine whether merged upsample/color conversion should be used.
+ * CRUCIAL: this must match the actual capabilities of jdmerge.c!
+ */
+
+LOCAL(boolean)
+use_merged_upsample (j_decompress_ptr cinfo)
+{
+#ifdef UPSAMPLE_MERGING_SUPPORTED
+  /* Merging is the equivalent of plain box-filter upsampling */
+  if (cinfo->do_fancy_upsampling || cinfo->CCIR601_sampling)
+    return FALSE;
+  /* jdmerge.c only supports YCC=>RGB color conversion */
+  if (cinfo->jpeg_color_space != JCS_YCbCr || cinfo->num_components != 3 ||
+      (cinfo->out_color_space != JCS_RGB &&
+      cinfo->out_color_space != JCS_EXT_RGB &&
+      cinfo->out_color_space != JCS_EXT_RGBX &&
+      cinfo->out_color_space != JCS_EXT_BGR &&
+      cinfo->out_color_space != JCS_EXT_BGRX &&
+      cinfo->out_color_space != JCS_EXT_XBGR &&
+      cinfo->out_color_space != JCS_EXT_XRGB &&
+      cinfo->out_color_space != JCS_EXT_RGBA &&
+      cinfo->out_color_space != JCS_EXT_BGRA &&
+      cinfo->out_color_space != JCS_EXT_ABGR &&
+      cinfo->out_color_space != JCS_EXT_ARGB) ||
+      cinfo->out_color_components != rgb_pixelsize[cinfo->out_color_space])
+    return FALSE;
+  /* and it only handles 2h1v or 2h2v sampling ratios */
+  if (cinfo->comp_info[0].h_samp_factor != 2 ||
+      cinfo->comp_info[1].h_samp_factor != 1 ||
+      cinfo->comp_info[2].h_samp_factor != 1 ||
+      cinfo->comp_info[0].v_samp_factor >  2 ||
+      cinfo->comp_info[1].v_samp_factor != 1 ||
+      cinfo->comp_info[2].v_samp_factor != 1)
+    return FALSE;
+  /* furthermore, it doesn't work if we've scaled the IDCTs differently */
+  if (cinfo->comp_info[0]._DCT_scaled_size != cinfo->_min_DCT_scaled_size ||
+      cinfo->comp_info[1]._DCT_scaled_size != cinfo->_min_DCT_scaled_size ||
+      cinfo->comp_info[2]._DCT_scaled_size != cinfo->_min_DCT_scaled_size)
+    return FALSE;
+  /* ??? also need to test for upsample-time rescaling, when & if supported */
+  return TRUE;			/* by golly, it'll work... */
+#else
+  return FALSE;
+#endif
+}
+
+
+/*
+ * Compute output image dimensions and related values.
+ * NOTE: this is exported for possible use by application.
+ * Hence it mustn't do anything that can't be done twice.
+ * Also note that it may be called before the master module is initialized!
+ */
+
+GLOBAL(void)
+jpeg_calc_output_dimensions (j_decompress_ptr cinfo)
+/* Do computations that are needed before master selection phase */
+{
+#ifdef IDCT_SCALING_SUPPORTED
+  int ci;
+  jpeg_component_info *compptr;
+#endif
+
+  /* Prevent application from calling me at wrong times */
+  if (cinfo->global_state != DSTATE_READY)
+    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
+
+#ifdef IDCT_SCALING_SUPPORTED
+
+  /* Compute actual output image dimensions and DCT scaling choices. */
+  if (cinfo->scale_num * 8 <= cinfo->scale_denom) {
+    /* Provide 1/8 scaling */
+    cinfo->output_width = (JDIMENSION)
+      jdiv_round_up((long) cinfo->image_width, 8L);
+    cinfo->output_height = (JDIMENSION)
+      jdiv_round_up((long) cinfo->image_height, 8L);
+#if JPEG_LIB_VERSION >= 70
+    cinfo->min_DCT_h_scaled_size = cinfo->min_DCT_v_scaled_size = 1;
+#else
+    cinfo->min_DCT_scaled_size = 1;
+#endif
+  } else if (cinfo->scale_num * 4 <= cinfo->scale_denom) {
+    /* Provide 1/4 scaling */
+    cinfo->output_width = (JDIMENSION)
+      jdiv_round_up((long) cinfo->image_width, 4L);
+    cinfo->output_height = (JDIMENSION)
+      jdiv_round_up((long) cinfo->image_height, 4L);
+#if JPEG_LIB_VERSION >= 70
+    cinfo->min_DCT_h_scaled_size = cinfo->min_DCT_v_scaled_size = 2;
+#else
+    cinfo->min_DCT_scaled_size = 2;
+#endif
+  } else if (cinfo->scale_num * 2 <= cinfo->scale_denom) {
+    /* Provide 1/2 scaling */
+    cinfo->output_width = (JDIMENSION)
+      jdiv_round_up((long) cinfo->image_width, 2L);
+    cinfo->output_height = (JDIMENSION)
+      jdiv_round_up((long) cinfo->image_height, 2L);
+#if JPEG_LIB_VERSION >= 70
+    cinfo->min_DCT_h_scaled_size = cinfo->min_DCT_v_scaled_size = 4;
+#else
+    cinfo->min_DCT_scaled_size = 4;
+#endif
+  } else {
+    /* Provide 1/1 scaling */
+    cinfo->output_width = cinfo->image_width;
+    cinfo->output_height = cinfo->image_height;
+#if JPEG_LIB_VERSION >= 70
+    cinfo->min_DCT_h_scaled_size = cinfo->min_DCT_v_scaled_size = DCTSIZE;
+#else
+    cinfo->min_DCT_scaled_size = DCTSIZE;
+#endif
+  }
+  /* In selecting the actual DCT scaling for each component, we try to
+   * scale up the chroma components via IDCT scaling rather than upsampling.
+   * This saves time if the upsampler gets to use 1:1 scaling.
+   * Note this code assumes that the supported DCT scalings are powers of 2.
+   */
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    int ssize = cinfo->_min_DCT_scaled_size;
+    while (ssize < DCTSIZE &&
+	   (compptr->h_samp_factor * ssize * 2 <=
+	    cinfo->max_h_samp_factor * cinfo->_min_DCT_scaled_size) &&
+	   (compptr->v_samp_factor * ssize * 2 <=
+	    cinfo->max_v_samp_factor * cinfo->_min_DCT_scaled_size)) {
+      ssize = ssize * 2;
+    }
+#if JPEG_LIB_VERSION >= 70
+    compptr->DCT_h_scaled_size = compptr->DCT_v_scaled_size = ssize;
+#else
+    compptr->DCT_scaled_size = ssize;
+#endif
+  }
+
+  /* Recompute downsampled dimensions of components;
+   * application needs to know these if using raw downsampled data.
+   */
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    /* Size in samples, after IDCT scaling */
+    compptr->downsampled_width = (JDIMENSION)
+      jdiv_round_up((long) cinfo->image_width *
+		    (long) (compptr->h_samp_factor * compptr->_DCT_scaled_size),
+		    (long) (cinfo->max_h_samp_factor * DCTSIZE));
+    compptr->downsampled_height = (JDIMENSION)
+      jdiv_round_up((long) cinfo->image_height *
+		    (long) (compptr->v_samp_factor * compptr->_DCT_scaled_size),
+		    (long) (cinfo->max_v_samp_factor * DCTSIZE));
+  }
+
+#else /* !IDCT_SCALING_SUPPORTED */
+
+  /* Hardwire it to "no scaling" */
+  cinfo->output_width = cinfo->image_width;
+  cinfo->output_height = cinfo->image_height;
+  /* jdinput.c has already initialized DCT_scaled_size to DCTSIZE,
+   * and has computed unscaled downsampled_width and downsampled_height.
+   */
+
+#endif /* IDCT_SCALING_SUPPORTED */
+
+  /* Report number of components in selected colorspace. */
+  /* Probably this should be in the color conversion module... */
+  switch (cinfo->out_color_space) {
+  case JCS_GRAYSCALE:
+    cinfo->out_color_components = 1;
+    break;
+  case JCS_RGB:
+  case JCS_EXT_RGB:
+  case JCS_EXT_RGBX:
+  case JCS_EXT_BGR:
+  case JCS_EXT_BGRX:
+  case JCS_EXT_XBGR:
+  case JCS_EXT_XRGB:
+  case JCS_EXT_RGBA:
+  case JCS_EXT_BGRA:
+  case JCS_EXT_ABGR:
+  case JCS_EXT_ARGB:
+    cinfo->out_color_components = rgb_pixelsize[cinfo->out_color_space];
+    break;
+  case JCS_YCbCr:
+    cinfo->out_color_components = 3;
+    break;
+  case JCS_CMYK:
+  case JCS_YCCK:
+    cinfo->out_color_components = 4;
+    break;
+  default:			/* else must be same colorspace as in file */
+    cinfo->out_color_components = cinfo->num_components;
+    break;
+  }
+  cinfo->output_components = (cinfo->quantize_colors ? 1 :
+			      cinfo->out_color_components);
+
+  /* See if upsampler will want to emit more than one row at a time */
+  if (use_merged_upsample(cinfo))
+    cinfo->rec_outbuf_height = cinfo->max_v_samp_factor;
+  else
+    cinfo->rec_outbuf_height = 1;
+}
+
+
+/*
+ * Several decompression processes need to range-limit values to the range
+ * 0..MAXJSAMPLE; the input value may fall somewhat outside this range
+ * due to noise introduced by quantization, roundoff error, etc.  These
+ * processes are inner loops and need to be as fast as possible.  On most
+ * machines, particularly CPUs with pipelines or instruction prefetch,
+ * a (subscript-check-less) C table lookup
+ *		x = sample_range_limit[x];
+ * is faster than explicit tests
+ *		if (x < 0)  x = 0;
+ *		else if (x > MAXJSAMPLE)  x = MAXJSAMPLE;
+ * These processes all use a common table prepared by the routine below.
+ *
+ * For most steps we can mathematically guarantee that the initial value
+ * of x is within MAXJSAMPLE+1 of the legal range, so a table running from
+ * -(MAXJSAMPLE+1) to 2*MAXJSAMPLE+1 is sufficient.  But for the initial
+ * limiting step (just after the IDCT), a wildly out-of-range value is 
+ * possible if the input data is corrupt.  To avoid any chance of indexing
+ * off the end of memory and getting a bad-pointer trap, we perform the
+ * post-IDCT limiting thus:
+ *		x = range_limit[x & MASK];
+ * where MASK is 2 bits wider than legal sample data, ie 10 bits for 8-bit
+ * samples.  Under normal circumstances this is more than enough range and
+ * a correct output will be generated; with bogus input data the mask will
+ * cause wraparound, and we will safely generate a bogus-but-in-range output.
+ * For the post-IDCT step, we want to convert the data from signed to unsigned
+ * representation by adding CENTERJSAMPLE at the same time that we limit it.
+ * So the post-IDCT limiting table ends up looking like this:
+ *   CENTERJSAMPLE,CENTERJSAMPLE+1,...,MAXJSAMPLE,
+ *   MAXJSAMPLE (repeat 2*(MAXJSAMPLE+1)-CENTERJSAMPLE times),
+ *   0          (repeat 2*(MAXJSAMPLE+1)-CENTERJSAMPLE times),
+ *   0,1,...,CENTERJSAMPLE-1
+ * Negative inputs select values from the upper half of the table after
+ * masking.
+ *
+ * We can save some space by overlapping the start of the post-IDCT table
+ * with the simpler range limiting table.  The post-IDCT table begins at
+ * sample_range_limit + CENTERJSAMPLE.
+ *
+ * Note that the table is allocated in near data space on PCs; it's small
+ * enough and used often enough to justify this.
+ */
+
+LOCAL(void)
+prepare_range_limit_table (j_decompress_ptr cinfo)
+/* Allocate and fill in the sample_range_limit table */
+{
+  JSAMPLE * table;
+  int i;
+
+  table = (JSAMPLE *)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+		(5 * (MAXJSAMPLE+1) + CENTERJSAMPLE) * SIZEOF(JSAMPLE));
+  table += (MAXJSAMPLE+1);	/* allow negative subscripts of simple table */
+  cinfo->sample_range_limit = table;
+  /* First segment of "simple" table: limit[x] = 0 for x < 0 */
+  MEMZERO(table - (MAXJSAMPLE+1), (MAXJSAMPLE+1) * SIZEOF(JSAMPLE));
+  /* Main part of "simple" table: limit[x] = x */
+  for (i = 0; i <= MAXJSAMPLE; i++)
+    table[i] = (JSAMPLE) i;
+  table += CENTERJSAMPLE;	/* Point to where post-IDCT table starts */
+  /* End of simple table, rest of first half of post-IDCT table */
+  for (i = CENTERJSAMPLE; i < 2*(MAXJSAMPLE+1); i++)
+    table[i] = MAXJSAMPLE;
+  /* Second half of post-IDCT table */
+  MEMZERO(table + (2 * (MAXJSAMPLE+1)),
+	  (2 * (MAXJSAMPLE+1) - CENTERJSAMPLE) * SIZEOF(JSAMPLE));
+  MEMCOPY(table + (4 * (MAXJSAMPLE+1) - CENTERJSAMPLE),
+	  cinfo->sample_range_limit, CENTERJSAMPLE * SIZEOF(JSAMPLE));
+}
+
+
+/*
+ * Master selection of decompression modules.
+ * This is done once at jpeg_start_decompress time.  We determine
+ * which modules will be used and give them appropriate initialization calls.
+ * We also initialize the decompressor input side to begin consuming data.
+ *
+ * Since jpeg_read_header has finished, we know what is in the SOF
+ * and (first) SOS markers.  We also have all the application parameter
+ * settings.
+ */
+
+LOCAL(void)
+master_selection (j_decompress_ptr cinfo)
+{
+  my_master_ptr master = (my_master_ptr) cinfo->master;
+  boolean use_c_buffer;
+  long samplesperrow;
+  JDIMENSION jd_samplesperrow;
+
+  /* Initialize dimensions and other stuff */
+  jpeg_calc_output_dimensions(cinfo);
+  prepare_range_limit_table(cinfo);
+
+  /* Width of an output scanline must be representable as JDIMENSION. */
+  samplesperrow = (long) cinfo->output_width * (long) cinfo->out_color_components;
+  jd_samplesperrow = (JDIMENSION) samplesperrow;
+  if ((long) jd_samplesperrow != samplesperrow)
+    ERREXIT(cinfo, JERR_WIDTH_OVERFLOW);
+
+  /* Initialize my private state */
+  master->pass_number = 0;
+  master->using_merged_upsample = use_merged_upsample(cinfo);
+
+  /* Color quantizer selection */
+  master->quantizer_1pass = NULL;
+  master->quantizer_2pass = NULL;
+  /* No mode changes if not using buffered-image mode. */
+  if (! cinfo->quantize_colors || ! cinfo->buffered_image) {
+    cinfo->enable_1pass_quant = FALSE;
+    cinfo->enable_external_quant = FALSE;
+    cinfo->enable_2pass_quant = FALSE;
+  }
+  if (cinfo->quantize_colors) {
+    if (cinfo->raw_data_out)
+      ERREXIT(cinfo, JERR_NOTIMPL);
+    /* 2-pass quantizer only works in 3-component color space. */
+    if (cinfo->out_color_components != 3) {
+      cinfo->enable_1pass_quant = TRUE;
+      cinfo->enable_external_quant = FALSE;
+      cinfo->enable_2pass_quant = FALSE;
+      cinfo->colormap = NULL;
+    } else if (cinfo->colormap != NULL) {
+      cinfo->enable_external_quant = TRUE;
+    } else if (cinfo->two_pass_quantize) {
+      cinfo->enable_2pass_quant = TRUE;
+    } else {
+      cinfo->enable_1pass_quant = TRUE;
+    }
+
+    if (cinfo->enable_1pass_quant) {
+#ifdef QUANT_1PASS_SUPPORTED
+      jinit_1pass_quantizer(cinfo);
+      master->quantizer_1pass = cinfo->cquantize;
+#else
+      ERREXIT(cinfo, JERR_NOT_COMPILED);
+#endif
+    }
+
+    /* We use the 2-pass code to map to external colormaps. */
+    if (cinfo->enable_2pass_quant || cinfo->enable_external_quant) {
+#ifdef QUANT_2PASS_SUPPORTED
+      jinit_2pass_quantizer(cinfo);
+      master->quantizer_2pass = cinfo->cquantize;
+#else
+      ERREXIT(cinfo, JERR_NOT_COMPILED);
+#endif
+    }
+    /* If both quantizers are initialized, the 2-pass one is left active;
+     * this is necessary for starting with quantization to an external map.
+     */
+  }
+
+  /* Post-processing: in particular, color conversion first */
+  if (! cinfo->raw_data_out) {
+    if (master->using_merged_upsample) {
+#ifdef UPSAMPLE_MERGING_SUPPORTED
+      jinit_merged_upsampler(cinfo); /* does color conversion too */
+#else
+      ERREXIT(cinfo, JERR_NOT_COMPILED);
+#endif
+    } else {
+      jinit_color_deconverter(cinfo);
+      jinit_upsampler(cinfo);
+    }
+    jinit_d_post_controller(cinfo, cinfo->enable_2pass_quant);
+  }
+  /* Inverse DCT */
+  jinit_inverse_dct(cinfo);
+  /* Entropy decoding: either Huffman or arithmetic coding. */
+  if (cinfo->arith_code) {
+#ifdef D_ARITH_CODING_SUPPORTED
+    jinit_arith_decoder(cinfo);
+#else
+    ERREXIT(cinfo, JERR_ARITH_NOTIMPL);
+#endif
+  } else {
+    if (cinfo->progressive_mode) {
+#ifdef D_PROGRESSIVE_SUPPORTED
+      jinit_phuff_decoder(cinfo);
+#else
+      ERREXIT(cinfo, JERR_NOT_COMPILED);
+#endif
+    } else
+      jinit_huff_decoder(cinfo);
+  }
+
+  /* Initialize principal buffer controllers. */
+  use_c_buffer = cinfo->inputctl->has_multiple_scans || cinfo->buffered_image;
+  jinit_d_coef_controller(cinfo, use_c_buffer);
+
+  if (! cinfo->raw_data_out)
+    jinit_d_main_controller(cinfo, FALSE /* never need full buffer here */);
+
+  /* We can now tell the memory manager to allocate virtual arrays. */
+  (*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo);
+
+  /* Initialize input side of decompressor to consume first scan. */
+  (*cinfo->inputctl->start_input_pass) (cinfo);
+
+#ifdef D_MULTISCAN_FILES_SUPPORTED
+  /* If jpeg_start_decompress will read the whole file, initialize
+   * progress monitoring appropriately.  The input step is counted
+   * as one pass.
+   */
+  if (cinfo->progress != NULL && ! cinfo->buffered_image &&
+      cinfo->inputctl->has_multiple_scans) {
+    int nscans;
+    /* Estimate number of scans to set pass_limit. */
+    if (cinfo->progressive_mode) {
+      /* Arbitrarily estimate 2 interleaved DC scans + 3 AC scans/component. */
+      nscans = 2 + 3 * cinfo->num_components;
+    } else {
+      /* For a nonprogressive multiscan file, estimate 1 scan per component. */
+      nscans = cinfo->num_components;
+    }
+    cinfo->progress->pass_counter = 0L;
+    cinfo->progress->pass_limit = (long) cinfo->total_iMCU_rows * nscans;
+    cinfo->progress->completed_passes = 0;
+    cinfo->progress->total_passes = (cinfo->enable_2pass_quant ? 3 : 2);
+    /* Count the input pass as done */
+    master->pass_number++;
+  }
+#endif /* D_MULTISCAN_FILES_SUPPORTED */
+}
+
+
+/*
+ * Per-pass setup.
+ * This is called at the beginning of each output pass.  We determine which
+ * modules will be active during this pass and give them appropriate
+ * start_pass calls.  We also set is_dummy_pass to indicate whether this
+ * is a "real" output pass or a dummy pass for color quantization.
+ * (In the latter case, jdapistd.c will crank the pass to completion.)
+ */
+
+METHODDEF(void)
+prepare_for_output_pass (j_decompress_ptr cinfo)
+{
+  my_master_ptr master = (my_master_ptr) cinfo->master;
+
+  if (master->pub.is_dummy_pass) {
+#ifdef QUANT_2PASS_SUPPORTED
+    /* Final pass of 2-pass quantization */
+    master->pub.is_dummy_pass = FALSE;
+    (*cinfo->cquantize->start_pass) (cinfo, FALSE);
+    (*cinfo->post->start_pass) (cinfo, JBUF_CRANK_DEST);
+    (*cinfo->main->start_pass) (cinfo, JBUF_CRANK_DEST);
+#else
+    ERREXIT(cinfo, JERR_NOT_COMPILED);
+#endif /* QUANT_2PASS_SUPPORTED */
+  } else {
+    if (cinfo->quantize_colors && cinfo->colormap == NULL) {
+      /* Select new quantization method */
+      if (cinfo->two_pass_quantize && cinfo->enable_2pass_quant) {
+	cinfo->cquantize = master->quantizer_2pass;
+	master->pub.is_dummy_pass = TRUE;
+      } else if (cinfo->enable_1pass_quant) {
+	cinfo->cquantize = master->quantizer_1pass;
+      } else {
+	ERREXIT(cinfo, JERR_MODE_CHANGE);
+      }
+    }
+    (*cinfo->idct->start_pass) (cinfo);
+    (*cinfo->coef->start_output_pass) (cinfo);
+    if (! cinfo->raw_data_out) {
+      if (! master->using_merged_upsample)
+	(*cinfo->cconvert->start_pass) (cinfo);
+      (*cinfo->upsample->start_pass) (cinfo);
+      if (cinfo->quantize_colors)
+	(*cinfo->cquantize->start_pass) (cinfo, master->pub.is_dummy_pass);
+      (*cinfo->post->start_pass) (cinfo,
+	    (master->pub.is_dummy_pass ? JBUF_SAVE_AND_PASS : JBUF_PASS_THRU));
+      (*cinfo->main->start_pass) (cinfo, JBUF_PASS_THRU);
+    }
+  }
+
+  /* Set up progress monitor's pass info if present */
+  if (cinfo->progress != NULL) {
+    cinfo->progress->completed_passes = master->pass_number;
+    cinfo->progress->total_passes = master->pass_number +
+				    (master->pub.is_dummy_pass ? 2 : 1);
+    /* In buffered-image mode, we assume one more output pass if EOI not
+     * yet reached, but no more passes if EOI has been reached.
+     */
+    if (cinfo->buffered_image && ! cinfo->inputctl->eoi_reached) {
+      cinfo->progress->total_passes += (cinfo->enable_2pass_quant ? 2 : 1);
+    }
+  }
+}
+
+
+/*
+ * Finish up at end of an output pass.
+ */
+
+METHODDEF(void)
+finish_output_pass (j_decompress_ptr cinfo)
+{
+  my_master_ptr master = (my_master_ptr) cinfo->master;
+
+  if (cinfo->quantize_colors)
+    (*cinfo->cquantize->finish_pass) (cinfo);
+  master->pass_number++;
+}
+
+
+#ifdef D_MULTISCAN_FILES_SUPPORTED
+
+/*
+ * Switch to a new external colormap between output passes.
+ */
+
+GLOBAL(void)
+jpeg_new_colormap (j_decompress_ptr cinfo)
+{
+  my_master_ptr master = (my_master_ptr) cinfo->master;
+
+  /* Prevent application from calling me at wrong times */
+  if (cinfo->global_state != DSTATE_BUFIMAGE)
+    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
+
+  if (cinfo->quantize_colors && cinfo->enable_external_quant &&
+      cinfo->colormap != NULL) {
+    /* Select 2-pass quantizer for external colormap use */
+    cinfo->cquantize = master->quantizer_2pass;
+    /* Notify quantizer of colormap change */
+    (*cinfo->cquantize->new_color_map) (cinfo);
+    master->pub.is_dummy_pass = FALSE; /* just in case */
+  } else
+    ERREXIT(cinfo, JERR_MODE_CHANGE);
+}
+
+#endif /* D_MULTISCAN_FILES_SUPPORTED */
+
+
+/*
+ * Initialize master decompression control and select active modules.
+ * This is performed at the start of jpeg_start_decompress.
+ */
+
+GLOBAL(void)
+jinit_master_decompress (j_decompress_ptr cinfo)
+{
+  my_master_ptr master;
+
+  master = (my_master_ptr)
+      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				  SIZEOF(my_decomp_master));
+  cinfo->master = (struct jpeg_decomp_master *) master;
+  master->pub.prepare_for_output_pass = prepare_for_output_pass;
+  master->pub.finish_output_pass = finish_output_pass;
+
+  master->pub.is_dummy_pass = FALSE;
+
+  master_selection(cinfo);
+}
diff --git a/src/libjpeg-turbo/jdmerge.c b/src/libjpeg-turbo/jdmerge.c
new file mode 100644
index 0000000..a8dcb46
--- /dev/null
+++ b/src/libjpeg-turbo/jdmerge.c
@@ -0,0 +1,455 @@
+/*
+ * jdmerge.c
+ *
+ * Copyright (C) 1994-1996, Thomas G. Lane.
+ * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+ * Copyright (C) 2009, 2011, D. R. Commander.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains code for merged upsampling/color conversion.
+ *
+ * This file combines functions from jdsample.c and jdcolor.c;
+ * read those files first to understand what's going on.
+ *
+ * When the chroma components are to be upsampled by simple replication
+ * (ie, box filtering), we can save some work in color conversion by
+ * calculating all the output pixels corresponding to a pair of chroma
+ * samples at one time.  In the conversion equations
+ *	R = Y           + K1 * Cr
+ *	G = Y + K2 * Cb + K3 * Cr
+ *	B = Y + K4 * Cb
+ * only the Y term varies among the group of pixels corresponding to a pair
+ * of chroma samples, so the rest of the terms can be calculated just once.
+ * At typical sampling ratios, this eliminates half or three-quarters of the
+ * multiplications needed for color conversion.
+ *
+ * This file currently provides implementations for the following cases:
+ *	YCbCr => RGB color conversion only.
+ *	Sampling ratios of 2h1v or 2h2v.
+ *	No scaling needed at upsample time.
+ *	Corner-aligned (non-CCIR601) sampling alignment.
+ * Other special cases could be added, but in most applications these are
+ * the only common cases.  (For uncommon cases we fall back on the more
+ * general code in jdsample.c and jdcolor.c.)
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jsimd.h"
+#include "config.h"
+
+#ifdef UPSAMPLE_MERGING_SUPPORTED
+
+
+/* Private subobject */
+
+typedef struct {
+  struct jpeg_upsampler pub;	/* public fields */
+
+  /* Pointer to routine to do actual upsampling/conversion of one row group */
+  JMETHOD(void, upmethod, (j_decompress_ptr cinfo,
+			   JSAMPIMAGE input_buf, JDIMENSION in_row_group_ctr,
+			   JSAMPARRAY output_buf));
+
+  /* Private state for YCC->RGB conversion */
+  int * Cr_r_tab;		/* => table for Cr to R conversion */
+  int * Cb_b_tab;		/* => table for Cb to B conversion */
+  INT32 * Cr_g_tab;		/* => table for Cr to G conversion */
+  INT32 * Cb_g_tab;		/* => table for Cb to G conversion */
+
+  /* For 2:1 vertical sampling, we produce two output rows at a time.
+   * We need a "spare" row buffer to hold the second output row if the
+   * application provides just a one-row buffer; we also use the spare
+   * to discard the dummy last row if the image height is odd.
+   */
+  JSAMPROW spare_row;
+  boolean spare_full;		/* T if spare buffer is occupied */
+
+  JDIMENSION out_row_width;	/* samples per output row */
+  JDIMENSION rows_to_go;	/* counts rows remaining in image */
+} my_upsampler;
+
+typedef my_upsampler * my_upsample_ptr;
+
+#define SCALEBITS	16	/* speediest right-shift on some machines */
+#define ONE_HALF	((INT32) 1 << (SCALEBITS-1))
+#define FIX(x)		((INT32) ((x) * (1L<<SCALEBITS) + 0.5))
+
+
+/* Include inline routines for colorspace extensions */
+
+#include "jdmrgext.c.inc"
+#undef RGB_RED
+#undef RGB_GREEN
+#undef RGB_BLUE
+#undef RGB_PIXELSIZE
+
+#define RGB_RED EXT_RGB_RED
+#define RGB_GREEN EXT_RGB_GREEN
+#define RGB_BLUE EXT_RGB_BLUE
+#define RGB_PIXELSIZE EXT_RGB_PIXELSIZE
+#define h2v1_merged_upsample_internal extrgb_h2v1_merged_upsample_internal
+#define h2v2_merged_upsample_internal extrgb_h2v2_merged_upsample_internal
+#include "jdmrgext.c.inc"
+#undef RGB_RED
+#undef RGB_GREEN
+#undef RGB_BLUE
+#undef RGB_PIXELSIZE
+#undef h2v1_merged_upsample_internal
+#undef h2v2_merged_upsample_internal
+
+#define RGB_RED EXT_RGBX_RED
+#define RGB_GREEN EXT_RGBX_GREEN
+#define RGB_BLUE EXT_RGBX_BLUE
+#define RGB_PIXELSIZE EXT_RGBX_PIXELSIZE
+#define h2v1_merged_upsample_internal extrgbx_h2v1_merged_upsample_internal
+#define h2v2_merged_upsample_internal extrgbx_h2v2_merged_upsample_internal
+#include "jdmrgext.c.inc"
+#undef RGB_RED
+#undef RGB_GREEN
+#undef RGB_BLUE
+#undef RGB_PIXELSIZE
+#undef h2v1_merged_upsample_internal
+#undef h2v2_merged_upsample_internal
+
+#define RGB_RED EXT_BGR_RED
+#define RGB_GREEN EXT_BGR_GREEN
+#define RGB_BLUE EXT_BGR_BLUE
+#define RGB_PIXELSIZE EXT_BGR_PIXELSIZE
+#define h2v1_merged_upsample_internal extbgr_h2v1_merged_upsample_internal
+#define h2v2_merged_upsample_internal extbgr_h2v2_merged_upsample_internal
+#include "jdmrgext.c.inc"
+#undef RGB_RED
+#undef RGB_GREEN
+#undef RGB_BLUE
+#undef RGB_PIXELSIZE
+#undef h2v1_merged_upsample_internal
+#undef h2v2_merged_upsample_internal
+
+#define RGB_RED EXT_BGRX_RED
+#define RGB_GREEN EXT_BGRX_GREEN
+#define RGB_BLUE EXT_BGRX_BLUE
+#define RGB_PIXELSIZE EXT_BGRX_PIXELSIZE
+#define h2v1_merged_upsample_internal extbgrx_h2v1_merged_upsample_internal
+#define h2v2_merged_upsample_internal extbgrx_h2v2_merged_upsample_internal
+#include "jdmrgext.c.inc"
+#undef RGB_RED
+#undef RGB_GREEN
+#undef RGB_BLUE
+#undef RGB_PIXELSIZE
+#undef h2v1_merged_upsample_internal
+#undef h2v2_merged_upsample_internal
+
+#define RGB_RED EXT_XBGR_RED
+#define RGB_GREEN EXT_XBGR_GREEN
+#define RGB_BLUE EXT_XBGR_BLUE
+#define RGB_PIXELSIZE EXT_XBGR_PIXELSIZE
+#define h2v1_merged_upsample_internal extxbgr_h2v1_merged_upsample_internal
+#define h2v2_merged_upsample_internal extxbgr_h2v2_merged_upsample_internal
+#include "jdmrgext.c.inc"
+#undef RGB_RED
+#undef RGB_GREEN
+#undef RGB_BLUE
+#undef RGB_PIXELSIZE
+#undef h2v1_merged_upsample_internal
+#undef h2v2_merged_upsample_internal
+
+#define RGB_RED EXT_XRGB_RED
+#define RGB_GREEN EXT_XRGB_GREEN
+#define RGB_BLUE EXT_XRGB_BLUE
+#define RGB_PIXELSIZE EXT_XRGB_PIXELSIZE
+#define h2v1_merged_upsample_internal extxrgb_h2v1_merged_upsample_internal
+#define h2v2_merged_upsample_internal extxrgb_h2v2_merged_upsample_internal
+#include "jdmrgext.c.inc"
+#undef RGB_RED
+#undef RGB_GREEN
+#undef RGB_BLUE
+#undef RGB_PIXELSIZE
+#undef h2v1_merged_upsample_internal
+#undef h2v2_merged_upsample_internal
+
+
+/*
+ * Initialize tables for YCC->RGB colorspace conversion.
+ * This is taken directly from jdcolor.c; see that file for more info.
+ */
+
+LOCAL(void)
+build_ycc_rgb_table (j_decompress_ptr cinfo)
+{
+  my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
+  int i;
+  INT32 x;
+  SHIFT_TEMPS
+
+  upsample->Cr_r_tab = (int *)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				(MAXJSAMPLE+1) * SIZEOF(int));
+  upsample->Cb_b_tab = (int *)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				(MAXJSAMPLE+1) * SIZEOF(int));
+  upsample->Cr_g_tab = (INT32 *)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				(MAXJSAMPLE+1) * SIZEOF(INT32));
+  upsample->Cb_g_tab = (INT32 *)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				(MAXJSAMPLE+1) * SIZEOF(INT32));
+
+  for (i = 0, x = -CENTERJSAMPLE; i <= MAXJSAMPLE; i++, x++) {
+    /* i is the actual input pixel value, in the range 0..MAXJSAMPLE */
+    /* The Cb or Cr value we are thinking of is x = i - CENTERJSAMPLE */
+    /* Cr=>R value is nearest int to 1.40200 * x */
+    upsample->Cr_r_tab[i] = (int)
+		    RIGHT_SHIFT(FIX(1.40200) * x + ONE_HALF, SCALEBITS);
+    /* Cb=>B value is nearest int to 1.77200 * x */
+    upsample->Cb_b_tab[i] = (int)
+		    RIGHT_SHIFT(FIX(1.77200) * x + ONE_HALF, SCALEBITS);
+    /* Cr=>G value is scaled-up -0.71414 * x */
+    upsample->Cr_g_tab[i] = (- FIX(0.71414)) * x;
+    /* Cb=>G value is scaled-up -0.34414 * x */
+    /* We also add in ONE_HALF so that need not do it in inner loop */
+    upsample->Cb_g_tab[i] = (- FIX(0.34414)) * x + ONE_HALF;
+  }
+}
+
+
+/*
+ * Initialize for an upsampling pass.
+ */
+
+METHODDEF(void)
+start_pass_merged_upsample (j_decompress_ptr cinfo)
+{
+  my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
+
+  /* Mark the spare buffer empty */
+  upsample->spare_full = FALSE;
+  /* Initialize total-height counter for detecting bottom of image */
+  upsample->rows_to_go = cinfo->output_height;
+}
+
+
+/*
+ * Control routine to do upsampling (and color conversion).
+ *
+ * The control routine just handles the row buffering considerations.
+ */
+
+METHODDEF(void)
+merged_2v_upsample (j_decompress_ptr cinfo,
+		    JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
+		    JDIMENSION in_row_groups_avail,
+		    JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
+		    JDIMENSION out_rows_avail)
+/* 2:1 vertical sampling case: may need a spare row. */
+{
+  my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
+  JSAMPROW work_ptrs[2];
+  JDIMENSION num_rows;		/* number of rows returned to caller */
+
+  if (upsample->spare_full) {
+    /* If we have a spare row saved from a previous cycle, just return it. */
+    jcopy_sample_rows(& upsample->spare_row, 0, output_buf + *out_row_ctr, 0,
+		      1, upsample->out_row_width);
+    num_rows = 1;
+    upsample->spare_full = FALSE;
+  } else {
+    /* Figure number of rows to return to caller. */
+    num_rows = 2;
+    /* Not more than the distance to the end of the image. */
+    if (num_rows > upsample->rows_to_go)
+      num_rows = upsample->rows_to_go;
+    /* And not more than what the client can accept: */
+    out_rows_avail -= *out_row_ctr;
+    if (num_rows > out_rows_avail)
+      num_rows = out_rows_avail;
+    /* Create output pointer array for upsampler. */
+    work_ptrs[0] = output_buf[*out_row_ctr];
+    if (num_rows > 1) {
+      work_ptrs[1] = output_buf[*out_row_ctr + 1];
+    } else {
+      work_ptrs[1] = upsample->spare_row;
+      upsample->spare_full = TRUE;
+    }
+    /* Now do the upsampling. */
+    (*upsample->upmethod) (cinfo, input_buf, *in_row_group_ctr, work_ptrs);
+  }
+
+  /* Adjust counts */
+  *out_row_ctr += num_rows;
+  upsample->rows_to_go -= num_rows;
+  /* When the buffer is emptied, declare this input row group consumed */
+  if (! upsample->spare_full)
+    (*in_row_group_ctr)++;
+}
+
+
+METHODDEF(void)
+merged_1v_upsample (j_decompress_ptr cinfo,
+		    JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
+		    JDIMENSION in_row_groups_avail,
+		    JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
+		    JDIMENSION out_rows_avail)
+/* 1:1 vertical sampling case: much easier, never need a spare row. */
+{
+  my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
+
+  /* Just do the upsampling. */
+  (*upsample->upmethod) (cinfo, input_buf, *in_row_group_ctr,
+			 output_buf + *out_row_ctr);
+  /* Adjust counts */
+  (*out_row_ctr)++;
+  (*in_row_group_ctr)++;
+}
+
+
+/*
+ * These are the routines invoked by the control routines to do
+ * the actual upsampling/conversion.  One row group is processed per call.
+ *
+ * Note: since we may be writing directly into application-supplied buffers,
+ * we have to be honest about the output width; we can't assume the buffer
+ * has been rounded up to an even width.
+ */
+
+
+/*
+ * Upsample and color convert for the case of 2:1 horizontal and 1:1 vertical.
+ */
+
+METHODDEF(void)
+h2v1_merged_upsample (j_decompress_ptr cinfo,
+		      JSAMPIMAGE input_buf, JDIMENSION in_row_group_ctr,
+		      JSAMPARRAY output_buf)
+{
+  switch (cinfo->out_color_space) {
+    case JCS_EXT_RGB:
+      extrgb_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
+                                           output_buf);
+      break;
+    case JCS_EXT_RGBX:
+    case JCS_EXT_RGBA:
+      extrgbx_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
+                                            output_buf);
+      break;
+    case JCS_EXT_BGR:
+      extbgr_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
+                                           output_buf);
+      break;
+    case JCS_EXT_BGRX:
+    case JCS_EXT_BGRA:
+      extbgrx_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
+                                            output_buf);
+      break;
+    case JCS_EXT_XBGR:
+    case JCS_EXT_ABGR:
+      extxbgr_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
+                                            output_buf);
+      break;
+    case JCS_EXT_XRGB:
+    case JCS_EXT_ARGB:
+      extxrgb_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
+                                            output_buf);
+      break;
+    default:
+      h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
+                                    output_buf);
+      break;
+  }
+}
+
+
+/*
+ * Upsample and color convert for the case of 2:1 horizontal and 2:1 vertical.
+ */
+
+METHODDEF(void)
+h2v2_merged_upsample (j_decompress_ptr cinfo,
+		      JSAMPIMAGE input_buf, JDIMENSION in_row_group_ctr,
+		      JSAMPARRAY output_buf)
+{
+  switch (cinfo->out_color_space) {
+    case JCS_EXT_RGB:
+      extrgb_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
+                                           output_buf);
+      break;
+    case JCS_EXT_RGBX:
+    case JCS_EXT_RGBA:
+      extrgbx_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
+                                            output_buf);
+      break;
+    case JCS_EXT_BGR:
+      extbgr_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
+                                           output_buf);
+      break;
+    case JCS_EXT_BGRX:
+    case JCS_EXT_BGRA:
+      extbgrx_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
+                                            output_buf);
+      break;
+    case JCS_EXT_XBGR:
+    case JCS_EXT_ABGR:
+      extxbgr_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
+                                            output_buf);
+      break;
+    case JCS_EXT_XRGB:
+    case JCS_EXT_ARGB:
+      extxrgb_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
+                                            output_buf);
+      break;
+    default:
+      h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
+                                    output_buf);
+      break;
+  }
+}
+
+
+/*
+ * Module initialization routine for merged upsampling/color conversion.
+ *
+ * NB: this is called under the conditions determined by use_merged_upsample()
+ * in jdmaster.c.  That routine MUST correspond to the actual capabilities
+ * of this module; no safety checks are made here.
+ */
+
+GLOBAL(void)
+jinit_merged_upsampler (j_decompress_ptr cinfo)
+{
+  my_upsample_ptr upsample;
+
+  upsample = (my_upsample_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				SIZEOF(my_upsampler));
+  cinfo->upsample = (struct jpeg_upsampler *) upsample;
+  upsample->pub.start_pass = start_pass_merged_upsample;
+  upsample->pub.need_context_rows = FALSE;
+
+  upsample->out_row_width = cinfo->output_width * cinfo->out_color_components;
+
+  if (cinfo->max_v_samp_factor == 2) {
+    upsample->pub.upsample = merged_2v_upsample;
+    if (jsimd_can_h2v2_merged_upsample())
+      upsample->upmethod = jsimd_h2v2_merged_upsample;
+    else
+      upsample->upmethod = h2v2_merged_upsample;
+    /* Allocate a spare row buffer */
+    upsample->spare_row = (JSAMPROW)
+      (*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+		(size_t) (upsample->out_row_width * SIZEOF(JSAMPLE)));
+  } else {
+    upsample->pub.upsample = merged_1v_upsample;
+    if (jsimd_can_h2v1_merged_upsample())
+      upsample->upmethod = jsimd_h2v1_merged_upsample;
+    else
+      upsample->upmethod = h2v1_merged_upsample;
+    /* No spare row needed */
+    upsample->spare_row = NULL;
+  }
+
+  build_ycc_rgb_table(cinfo);
+}
+
+#endif /* UPSAMPLE_MERGING_SUPPORTED */
diff --git a/src/libjpeg-turbo/jdmrgext.c.inc b/src/libjpeg-turbo/jdmrgext.c.inc
new file mode 100644
index 0000000..95ddd55
--- /dev/null
+++ b/src/libjpeg-turbo/jdmrgext.c.inc
@@ -0,0 +1,156 @@
+/*
+ * jdmrgext.c
+ *
+ * Copyright (C) 1994-1996, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains code for merged upsampling/color conversion.
+ */
+
+
+/* This file is included by jdmerge.c */
+
+
+/*
+ * Upsample and color convert for the case of 2:1 horizontal and 1:1 vertical.
+ */
+
+INLINE
+LOCAL(void)
+h2v1_merged_upsample_internal (j_decompress_ptr cinfo,
+                               JSAMPIMAGE input_buf,
+                               JDIMENSION in_row_group_ctr,
+                               JSAMPARRAY output_buf)
+{
+  my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
+  register int y, cred, cgreen, cblue;
+  int cb, cr;
+  register JSAMPROW outptr;
+  JSAMPROW inptr0, inptr1, inptr2;
+  JDIMENSION col;
+  /* copy these pointers into registers if possible */
+  register JSAMPLE * range_limit = cinfo->sample_range_limit;
+  int * Crrtab = upsample->Cr_r_tab;
+  int * Cbbtab = upsample->Cb_b_tab;
+  INT32 * Crgtab = upsample->Cr_g_tab;
+  INT32 * Cbgtab = upsample->Cb_g_tab;
+  SHIFT_TEMPS
+
+  inptr0 = input_buf[0][in_row_group_ctr];
+  inptr1 = input_buf[1][in_row_group_ctr];
+  inptr2 = input_buf[2][in_row_group_ctr];
+  outptr = output_buf[0];
+  /* Loop for each pair of output pixels */
+  for (col = cinfo->output_width >> 1; col > 0; col--) {
+    /* Do the chroma part of the calculation */
+    cb = GETJSAMPLE(*inptr1++);
+    cr = GETJSAMPLE(*inptr2++);
+    cred = Crrtab[cr];
+    cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
+    cblue = Cbbtab[cb];
+    /* Fetch 2 Y values and emit 2 pixels */
+    y  = GETJSAMPLE(*inptr0++);
+    outptr[RGB_RED] =   range_limit[y + cred];
+    outptr[RGB_GREEN] = range_limit[y + cgreen];
+    outptr[RGB_BLUE] =  range_limit[y + cblue];
+    outptr += RGB_PIXELSIZE;
+    y  = GETJSAMPLE(*inptr0++);
+    outptr[RGB_RED] =   range_limit[y + cred];
+    outptr[RGB_GREEN] = range_limit[y + cgreen];
+    outptr[RGB_BLUE] =  range_limit[y + cblue];
+    outptr += RGB_PIXELSIZE;
+  }
+  /* If image width is odd, do the last output column separately */
+  if (cinfo->output_width & 1) {
+    cb = GETJSAMPLE(*inptr1);
+    cr = GETJSAMPLE(*inptr2);
+    cred = Crrtab[cr];
+    cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
+    cblue = Cbbtab[cb];
+    y  = GETJSAMPLE(*inptr0);
+    outptr[RGB_RED] =   range_limit[y + cred];
+    outptr[RGB_GREEN] = range_limit[y + cgreen];
+    outptr[RGB_BLUE] =  range_limit[y + cblue];
+  }
+}
+
+
+/*
+ * Upsample and color convert for the case of 2:1 horizontal and 2:1 vertical.
+ */
+
+INLINE
+LOCAL(void)
+h2v2_merged_upsample_internal (j_decompress_ptr cinfo,
+                               JSAMPIMAGE input_buf,
+                               JDIMENSION in_row_group_ctr,
+                               JSAMPARRAY output_buf)
+{
+  my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
+  register int y, cred, cgreen, cblue;
+  int cb, cr;
+  register JSAMPROW outptr0, outptr1;
+  JSAMPROW inptr00, inptr01, inptr1, inptr2;
+  JDIMENSION col;
+  /* copy these pointers into registers if possible */
+  register JSAMPLE * range_limit = cinfo->sample_range_limit;
+  int * Crrtab = upsample->Cr_r_tab;
+  int * Cbbtab = upsample->Cb_b_tab;
+  INT32 * Crgtab = upsample->Cr_g_tab;
+  INT32 * Cbgtab = upsample->Cb_g_tab;
+  SHIFT_TEMPS
+
+  inptr00 = input_buf[0][in_row_group_ctr*2];
+  inptr01 = input_buf[0][in_row_group_ctr*2 + 1];
+  inptr1 = input_buf[1][in_row_group_ctr];
+  inptr2 = input_buf[2][in_row_group_ctr];
+  outptr0 = output_buf[0];
+  outptr1 = output_buf[1];
+  /* Loop for each group of output pixels */
+  for (col = cinfo->output_width >> 1; col > 0; col--) {
+    /* Do the chroma part of the calculation */
+    cb = GETJSAMPLE(*inptr1++);
+    cr = GETJSAMPLE(*inptr2++);
+    cred = Crrtab[cr];
+    cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
+    cblue = Cbbtab[cb];
+    /* Fetch 4 Y values and emit 4 pixels */
+    y  = GETJSAMPLE(*inptr00++);
+    outptr0[RGB_RED] =   range_limit[y + cred];
+    outptr0[RGB_GREEN] = range_limit[y + cgreen];
+    outptr0[RGB_BLUE] =  range_limit[y + cblue];
+    outptr0 += RGB_PIXELSIZE;
+    y  = GETJSAMPLE(*inptr00++);
+    outptr0[RGB_RED] =   range_limit[y + cred];
+    outptr0[RGB_GREEN] = range_limit[y + cgreen];
+    outptr0[RGB_BLUE] =  range_limit[y + cblue];
+    outptr0 += RGB_PIXELSIZE;
+    y  = GETJSAMPLE(*inptr01++);
+    outptr1[RGB_RED] =   range_limit[y + cred];
+    outptr1[RGB_GREEN] = range_limit[y + cgreen];
+    outptr1[RGB_BLUE] =  range_limit[y + cblue];
+    outptr1 += RGB_PIXELSIZE;
+    y  = GETJSAMPLE(*inptr01++);
+    outptr1[RGB_RED] =   range_limit[y + cred];
+    outptr1[RGB_GREEN] = range_limit[y + cgreen];
+    outptr1[RGB_BLUE] =  range_limit[y + cblue];
+    outptr1 += RGB_PIXELSIZE;
+  }
+  /* If image width is odd, do the last output column separately */
+  if (cinfo->output_width & 1) {
+    cb = GETJSAMPLE(*inptr1);
+    cr = GETJSAMPLE(*inptr2);
+    cred = Crrtab[cr];
+    cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
+    cblue = Cbbtab[cb];
+    y  = GETJSAMPLE(*inptr00);
+    outptr0[RGB_RED] =   range_limit[y + cred];
+    outptr0[RGB_GREEN] = range_limit[y + cgreen];
+    outptr0[RGB_BLUE] =  range_limit[y + cblue];
+    y  = GETJSAMPLE(*inptr01);
+    outptr1[RGB_RED] =   range_limit[y + cred];
+    outptr1[RGB_GREEN] = range_limit[y + cgreen];
+    outptr1[RGB_BLUE] =  range_limit[y + cblue];
+  }
+}
diff --git a/src/libjpeg-turbo/jdphuff.c b/src/libjpeg-turbo/jdphuff.c
new file mode 100644
index 0000000..2267809
--- /dev/null
+++ b/src/libjpeg-turbo/jdphuff.c
@@ -0,0 +1,668 @@
+/*
+ * jdphuff.c
+ *
+ * Copyright (C) 1995-1997, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains Huffman entropy decoding routines for progressive JPEG.
+ *
+ * Much of the complexity here has to do with supporting input suspension.
+ * If the data source module demands suspension, we want to be able to back
+ * up to the start of the current MCU.  To do this, we copy state variables
+ * into local working storage, and update them back to the permanent
+ * storage only upon successful completion of an MCU.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jdhuff.h"		/* Declarations shared with jdhuff.c */
+
+
+#ifdef D_PROGRESSIVE_SUPPORTED
+
+/*
+ * Expanded entropy decoder object for progressive Huffman decoding.
+ *
+ * The savable_state subrecord contains fields that change within an MCU,
+ * but must not be updated permanently until we complete the MCU.
+ */
+
+typedef struct {
+  unsigned int EOBRUN;			/* remaining EOBs in EOBRUN */
+  int last_dc_val[MAX_COMPS_IN_SCAN];	/* last DC coef for each component */
+} savable_state;
+
+/* This macro is to work around compilers with missing or broken
+ * structure assignment.  You'll need to fix this code if you have
+ * such a compiler and you change MAX_COMPS_IN_SCAN.
+ */
+
+#ifndef NO_STRUCT_ASSIGN
+#define ASSIGN_STATE(dest,src)  ((dest) = (src))
+#else
+#if MAX_COMPS_IN_SCAN == 4
+#define ASSIGN_STATE(dest,src)  \
+	((dest).EOBRUN = (src).EOBRUN, \
+	 (dest).last_dc_val[0] = (src).last_dc_val[0], \
+	 (dest).last_dc_val[1] = (src).last_dc_val[1], \
+	 (dest).last_dc_val[2] = (src).last_dc_val[2], \
+	 (dest).last_dc_val[3] = (src).last_dc_val[3])
+#endif
+#endif
+
+
+typedef struct {
+  struct jpeg_entropy_decoder pub; /* public fields */
+
+  /* These fields are loaded into local variables at start of each MCU.
+   * In case of suspension, we exit WITHOUT updating them.
+   */
+  bitread_perm_state bitstate;	/* Bit buffer at start of MCU */
+  savable_state saved;		/* Other state at start of MCU */
+
+  /* These fields are NOT loaded into local working state. */
+  unsigned int restarts_to_go;	/* MCUs left in this restart interval */
+
+  /* Pointers to derived tables (these workspaces have image lifespan) */
+  d_derived_tbl * derived_tbls[NUM_HUFF_TBLS];
+
+  d_derived_tbl * ac_derived_tbl; /* active table during an AC scan */
+} phuff_entropy_decoder;
+
+typedef phuff_entropy_decoder * phuff_entropy_ptr;
+
+/* Forward declarations */
+METHODDEF(boolean) decode_mcu_DC_first JPP((j_decompress_ptr cinfo,
+					    JBLOCKROW *MCU_data));
+METHODDEF(boolean) decode_mcu_AC_first JPP((j_decompress_ptr cinfo,
+					    JBLOCKROW *MCU_data));
+METHODDEF(boolean) decode_mcu_DC_refine JPP((j_decompress_ptr cinfo,
+					     JBLOCKROW *MCU_data));
+METHODDEF(boolean) decode_mcu_AC_refine JPP((j_decompress_ptr cinfo,
+					     JBLOCKROW *MCU_data));
+
+
+/*
+ * Initialize for a Huffman-compressed scan.
+ */
+
+METHODDEF(void)
+start_pass_phuff_decoder (j_decompress_ptr cinfo)
+{
+  phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
+  boolean is_DC_band, bad;
+  int ci, coefi, tbl;
+  int *coef_bit_ptr;
+  jpeg_component_info * compptr;
+
+  is_DC_band = (cinfo->Ss == 0);
+
+  /* Validate scan parameters */
+  bad = FALSE;
+  if (is_DC_band) {
+    if (cinfo->Se != 0)
+      bad = TRUE;
+  } else {
+    /* need not check Ss/Se < 0 since they came from unsigned bytes */
+    if (cinfo->Ss > cinfo->Se || cinfo->Se >= DCTSIZE2)
+      bad = TRUE;
+    /* AC scans may have only one component */
+    if (cinfo->comps_in_scan != 1)
+      bad = TRUE;
+  }
+  if (cinfo->Ah != 0) {
+    /* Successive approximation refinement scan: must have Al = Ah-1. */
+    if (cinfo->Al != cinfo->Ah-1)
+      bad = TRUE;
+  }
+  if (cinfo->Al > 13)		/* need not check for < 0 */
+    bad = TRUE;
+  /* Arguably the maximum Al value should be less than 13 for 8-bit precision,
+   * but the spec doesn't say so, and we try to be liberal about what we
+   * accept.  Note: large Al values could result in out-of-range DC
+   * coefficients during early scans, leading to bizarre displays due to
+   * overflows in the IDCT math.  But we won't crash.
+   */
+  if (bad)
+    ERREXIT4(cinfo, JERR_BAD_PROGRESSION,
+	     cinfo->Ss, cinfo->Se, cinfo->Ah, cinfo->Al);
+  /* Update progression status, and verify that scan order is legal.
+   * Note that inter-scan inconsistencies are treated as warnings
+   * not fatal errors ... not clear if this is right way to behave.
+   */
+  for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
+    int cindex = cinfo->cur_comp_info[ci]->component_index;
+    coef_bit_ptr = & cinfo->coef_bits[cindex][0];
+    if (!is_DC_band && coef_bit_ptr[0] < 0) /* AC without prior DC scan */
+      WARNMS2(cinfo, JWRN_BOGUS_PROGRESSION, cindex, 0);
+    for (coefi = cinfo->Ss; coefi <= cinfo->Se; coefi++) {
+      int expected = (coef_bit_ptr[coefi] < 0) ? 0 : coef_bit_ptr[coefi];
+      if (cinfo->Ah != expected)
+	WARNMS2(cinfo, JWRN_BOGUS_PROGRESSION, cindex, coefi);
+      coef_bit_ptr[coefi] = cinfo->Al;
+    }
+  }
+
+  /* Select MCU decoding routine */
+  if (cinfo->Ah == 0) {
+    if (is_DC_band)
+      entropy->pub.decode_mcu = decode_mcu_DC_first;
+    else
+      entropy->pub.decode_mcu = decode_mcu_AC_first;
+  } else {
+    if (is_DC_band)
+      entropy->pub.decode_mcu = decode_mcu_DC_refine;
+    else
+      entropy->pub.decode_mcu = decode_mcu_AC_refine;
+  }
+
+  for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
+    compptr = cinfo->cur_comp_info[ci];
+    /* Make sure requested tables are present, and compute derived tables.
+     * We may build same derived table more than once, but it's not expensive.
+     */
+    if (is_DC_band) {
+      if (cinfo->Ah == 0) {	/* DC refinement needs no table */
+	tbl = compptr->dc_tbl_no;
+	jpeg_make_d_derived_tbl(cinfo, TRUE, tbl,
+				& entropy->derived_tbls[tbl]);
+      }
+    } else {
+      tbl = compptr->ac_tbl_no;
+      jpeg_make_d_derived_tbl(cinfo, FALSE, tbl,
+			      & entropy->derived_tbls[tbl]);
+      /* remember the single active table */
+      entropy->ac_derived_tbl = entropy->derived_tbls[tbl];
+    }
+    /* Initialize DC predictions to 0 */
+    entropy->saved.last_dc_val[ci] = 0;
+  }
+
+  /* Initialize bitread state variables */
+  entropy->bitstate.bits_left = 0;
+  entropy->bitstate.get_buffer = 0; /* unnecessary, but keeps Purify quiet */
+  entropy->pub.insufficient_data = FALSE;
+
+  /* Initialize private state variables */
+  entropy->saved.EOBRUN = 0;
+
+  /* Initialize restart counter */
+  entropy->restarts_to_go = cinfo->restart_interval;
+}
+
+
+/*
+ * Figure F.12: extend sign bit.
+ * On some machines, a shift and add will be faster than a table lookup.
+ */
+
+#ifdef AVOID_TABLES
+
+#define HUFF_EXTEND(x,s)  ((x) < (1<<((s)-1)) ? (x) + (((-1)<<(s)) + 1) : (x))
+
+#else
+
+#define HUFF_EXTEND(x,s)  ((x) < extend_test[s] ? (x) + extend_offset[s] : (x))
+
+static const int extend_test[16] =   /* entry n is 2**(n-1) */
+  { 0, 0x0001, 0x0002, 0x0004, 0x0008, 0x0010, 0x0020, 0x0040, 0x0080,
+    0x0100, 0x0200, 0x0400, 0x0800, 0x1000, 0x2000, 0x4000 };
+
+static const int extend_offset[16] = /* entry n is (-1 << n) + 1 */
+  { 0, ((-1)<<1) + 1, ((-1)<<2) + 1, ((-1)<<3) + 1, ((-1)<<4) + 1,
+    ((-1)<<5) + 1, ((-1)<<6) + 1, ((-1)<<7) + 1, ((-1)<<8) + 1,
+    ((-1)<<9) + 1, ((-1)<<10) + 1, ((-1)<<11) + 1, ((-1)<<12) + 1,
+    ((-1)<<13) + 1, ((-1)<<14) + 1, ((-1)<<15) + 1 };
+
+#endif /* AVOID_TABLES */
+
+
+/*
+ * Check for a restart marker & resynchronize decoder.
+ * Returns FALSE if must suspend.
+ */
+
+LOCAL(boolean)
+process_restart (j_decompress_ptr cinfo)
+{
+  phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
+  int ci;
+
+  /* Throw away any unused bits remaining in bit buffer; */
+  /* include any full bytes in next_marker's count of discarded bytes */
+  cinfo->marker->discarded_bytes += entropy->bitstate.bits_left / 8;
+  entropy->bitstate.bits_left = 0;
+
+  /* Advance past the RSTn marker */
+  if (! (*cinfo->marker->read_restart_marker) (cinfo))
+    return FALSE;
+
+  /* Re-initialize DC predictions to 0 */
+  for (ci = 0; ci < cinfo->comps_in_scan; ci++)
+    entropy->saved.last_dc_val[ci] = 0;
+  /* Re-init EOB run count, too */
+  entropy->saved.EOBRUN = 0;
+
+  /* Reset restart counter */
+  entropy->restarts_to_go = cinfo->restart_interval;
+
+  /* Reset out-of-data flag, unless read_restart_marker left us smack up
+   * against a marker.  In that case we will end up treating the next data
+   * segment as empty, and we can avoid producing bogus output pixels by
+   * leaving the flag set.
+   */
+  if (cinfo->unread_marker == 0)
+    entropy->pub.insufficient_data = FALSE;
+
+  return TRUE;
+}
+
+
+/*
+ * Huffman MCU decoding.
+ * Each of these routines decodes and returns one MCU's worth of
+ * Huffman-compressed coefficients. 
+ * The coefficients are reordered from zigzag order into natural array order,
+ * but are not dequantized.
+ *
+ * The i'th block of the MCU is stored into the block pointed to by
+ * MCU_data[i].  WE ASSUME THIS AREA IS INITIALLY ZEROED BY THE CALLER.
+ *
+ * We return FALSE if data source requested suspension.  In that case no
+ * changes have been made to permanent state.  (Exception: some output
+ * coefficients may already have been assigned.  This is harmless for
+ * spectral selection, since we'll just re-assign them on the next call.
+ * Successive approximation AC refinement has to be more careful, however.)
+ */
+
+/*
+ * MCU decoding for DC initial scan (either spectral selection,
+ * or first pass of successive approximation).
+ */
+
+METHODDEF(boolean)
+decode_mcu_DC_first (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
+{   
+  phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
+  int Al = cinfo->Al;
+  register int s, r;
+  int blkn, ci;
+  JBLOCKROW block;
+  BITREAD_STATE_VARS;
+  savable_state state;
+  d_derived_tbl * tbl;
+  jpeg_component_info * compptr;
+
+  /* Process restart marker if needed; may have to suspend */
+  if (cinfo->restart_interval) {
+    if (entropy->restarts_to_go == 0)
+      if (! process_restart(cinfo))
+	return FALSE;
+  }
+
+  /* If we've run out of data, just leave the MCU set to zeroes.
+   * This way, we return uniform gray for the remainder of the segment.
+   */
+  if (! entropy->pub.insufficient_data) {
+
+    /* Load up working state */
+    BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
+    ASSIGN_STATE(state, entropy->saved);
+
+    /* Outer loop handles each block in the MCU */
+
+    for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
+      block = MCU_data[blkn];
+      ci = cinfo->MCU_membership[blkn];
+      compptr = cinfo->cur_comp_info[ci];
+      tbl = entropy->derived_tbls[compptr->dc_tbl_no];
+
+      /* Decode a single block's worth of coefficients */
+
+      /* Section F.2.2.1: decode the DC coefficient difference */
+      HUFF_DECODE(s, br_state, tbl, return FALSE, label1);
+      if (s) {
+	CHECK_BIT_BUFFER(br_state, s, return FALSE);
+	r = GET_BITS(s);
+	s = HUFF_EXTEND(r, s);
+      }
+
+      /* Convert DC difference to actual value, update last_dc_val */
+      s += state.last_dc_val[ci];
+      state.last_dc_val[ci] = s;
+      /* Scale and output the coefficient (assumes jpeg_natural_order[0]=0) */
+      (*block)[0] = (JCOEF) (s << Al);
+    }
+
+    /* Completed MCU, so update state */
+    BITREAD_SAVE_STATE(cinfo,entropy->bitstate);
+    ASSIGN_STATE(entropy->saved, state);
+  }
+
+  /* Account for restart interval (no-op if not using restarts) */
+  entropy->restarts_to_go--;
+
+  return TRUE;
+}
+
+
+/*
+ * MCU decoding for AC initial scan (either spectral selection,
+ * or first pass of successive approximation).
+ */
+
+METHODDEF(boolean)
+decode_mcu_AC_first (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
+{   
+  phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
+  int Se = cinfo->Se;
+  int Al = cinfo->Al;
+  register int s, k, r;
+  unsigned int EOBRUN;
+  JBLOCKROW block;
+  BITREAD_STATE_VARS;
+  d_derived_tbl * tbl;
+
+  /* Process restart marker if needed; may have to suspend */
+  if (cinfo->restart_interval) {
+    if (entropy->restarts_to_go == 0)
+      if (! process_restart(cinfo))
+	return FALSE;
+  }
+
+  /* If we've run out of data, just leave the MCU set to zeroes.
+   * This way, we return uniform gray for the remainder of the segment.
+   */
+  if (! entropy->pub.insufficient_data) {
+
+    /* Load up working state.
+     * We can avoid loading/saving bitread state if in an EOB run.
+     */
+    EOBRUN = entropy->saved.EOBRUN;	/* only part of saved state we need */
+
+    /* There is always only one block per MCU */
+
+    if (EOBRUN > 0)		/* if it's a band of zeroes... */
+      EOBRUN--;			/* ...process it now (we do nothing) */
+    else {
+      BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
+      block = MCU_data[0];
+      tbl = entropy->ac_derived_tbl;
+
+      for (k = cinfo->Ss; k <= Se; k++) {
+	HUFF_DECODE(s, br_state, tbl, return FALSE, label2);
+	r = s >> 4;
+	s &= 15;
+	if (s) {
+	  k += r;
+	  CHECK_BIT_BUFFER(br_state, s, return FALSE);
+	  r = GET_BITS(s);
+	  s = HUFF_EXTEND(r, s);
+	  /* Scale and output coefficient in natural (dezigzagged) order */
+	  (*block)[jpeg_natural_order[k]] = (JCOEF) (s << Al);
+	} else {
+	  if (r == 15) {	/* ZRL */
+	    k += 15;		/* skip 15 zeroes in band */
+	  } else {		/* EOBr, run length is 2^r + appended bits */
+	    EOBRUN = 1 << r;
+	    if (r) {		/* EOBr, r > 0 */
+	      CHECK_BIT_BUFFER(br_state, r, return FALSE);
+	      r = GET_BITS(r);
+	      EOBRUN += r;
+	    }
+	    EOBRUN--;		/* this band is processed at this moment */
+	    break;		/* force end-of-band */
+	  }
+	}
+      }
+
+      BITREAD_SAVE_STATE(cinfo,entropy->bitstate);
+    }
+
+    /* Completed MCU, so update state */
+    entropy->saved.EOBRUN = EOBRUN;	/* only part of saved state we need */
+  }
+
+  /* Account for restart interval (no-op if not using restarts) */
+  entropy->restarts_to_go--;
+
+  return TRUE;
+}
+
+
+/*
+ * MCU decoding for DC successive approximation refinement scan.
+ * Note: we assume such scans can be multi-component, although the spec
+ * is not very clear on the point.
+ */
+
+METHODDEF(boolean)
+decode_mcu_DC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
+{   
+  phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
+  int p1 = 1 << cinfo->Al;	/* 1 in the bit position being coded */
+  int blkn;
+  JBLOCKROW block;
+  BITREAD_STATE_VARS;
+
+  /* Process restart marker if needed; may have to suspend */
+  if (cinfo->restart_interval) {
+    if (entropy->restarts_to_go == 0)
+      if (! process_restart(cinfo))
+	return FALSE;
+  }
+
+  /* Not worth the cycles to check insufficient_data here,
+   * since we will not change the data anyway if we read zeroes.
+   */
+
+  /* Load up working state */
+  BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
+
+  /* Outer loop handles each block in the MCU */
+
+  for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
+    block = MCU_data[blkn];
+
+    /* Encoded data is simply the next bit of the two's-complement DC value */
+    CHECK_BIT_BUFFER(br_state, 1, return FALSE);
+    if (GET_BITS(1))
+      (*block)[0] |= p1;
+    /* Note: since we use |=, repeating the assignment later is safe */
+  }
+
+  /* Completed MCU, so update state */
+  BITREAD_SAVE_STATE(cinfo,entropy->bitstate);
+
+  /* Account for restart interval (no-op if not using restarts) */
+  entropy->restarts_to_go--;
+
+  return TRUE;
+}
+
+
+/*
+ * MCU decoding for AC successive approximation refinement scan.
+ */
+
+METHODDEF(boolean)
+decode_mcu_AC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
+{   
+  phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
+  int Se = cinfo->Se;
+  int p1 = 1 << cinfo->Al;	/* 1 in the bit position being coded */
+  int m1 = (-1) << cinfo->Al;	/* -1 in the bit position being coded */
+  register int s, k, r;
+  unsigned int EOBRUN;
+  JBLOCKROW block;
+  JCOEFPTR thiscoef;
+  BITREAD_STATE_VARS;
+  d_derived_tbl * tbl;
+  int num_newnz;
+  int newnz_pos[DCTSIZE2];
+
+  /* Process restart marker if needed; may have to suspend */
+  if (cinfo->restart_interval) {
+    if (entropy->restarts_to_go == 0)
+      if (! process_restart(cinfo))
+	return FALSE;
+  }
+
+  /* If we've run out of data, don't modify the MCU.
+   */
+  if (! entropy->pub.insufficient_data) {
+
+    /* Load up working state */
+    BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
+    EOBRUN = entropy->saved.EOBRUN; /* only part of saved state we need */
+
+    /* There is always only one block per MCU */
+    block = MCU_data[0];
+    tbl = entropy->ac_derived_tbl;
+
+    /* If we are forced to suspend, we must undo the assignments to any newly
+     * nonzero coefficients in the block, because otherwise we'd get confused
+     * next time about which coefficients were already nonzero.
+     * But we need not undo addition of bits to already-nonzero coefficients;
+     * instead, we can test the current bit to see if we already did it.
+     */
+    num_newnz = 0;
+
+    /* initialize coefficient loop counter to start of band */
+    k = cinfo->Ss;
+
+    if (EOBRUN == 0) {
+      for (; k <= Se; k++) {
+	HUFF_DECODE(s, br_state, tbl, goto undoit, label3);
+	r = s >> 4;
+	s &= 15;
+	if (s) {
+	  if (s != 1)		/* size of new coef should always be 1 */
+	    WARNMS(cinfo, JWRN_HUFF_BAD_CODE);
+	  CHECK_BIT_BUFFER(br_state, 1, goto undoit);
+	  if (GET_BITS(1))
+	    s = p1;		/* newly nonzero coef is positive */
+	  else
+	    s = m1;		/* newly nonzero coef is negative */
+	} else {
+	  if (r != 15) {
+	    EOBRUN = 1 << r;	/* EOBr, run length is 2^r + appended bits */
+	    if (r) {
+	      CHECK_BIT_BUFFER(br_state, r, goto undoit);
+	      r = GET_BITS(r);
+	      EOBRUN += r;
+	    }
+	    break;		/* rest of block is handled by EOB logic */
+	  }
+	  /* note s = 0 for processing ZRL */
+	}
+	/* Advance over already-nonzero coefs and r still-zero coefs,
+	 * appending correction bits to the nonzeroes.  A correction bit is 1
+	 * if the absolute value of the coefficient must be increased.
+	 */
+	do {
+	  thiscoef = *block + jpeg_natural_order[k];
+	  if (*thiscoef != 0) {
+	    CHECK_BIT_BUFFER(br_state, 1, goto undoit);
+	    if (GET_BITS(1)) {
+	      if ((*thiscoef & p1) == 0) { /* do nothing if already set it */
+		if (*thiscoef >= 0)
+		  *thiscoef += p1;
+		else
+		  *thiscoef += m1;
+	      }
+	    }
+	  } else {
+	    if (--r < 0)
+	      break;		/* reached target zero coefficient */
+	  }
+	  k++;
+	} while (k <= Se);
+	if (s) {
+	  int pos = jpeg_natural_order[k];
+	  /* Output newly nonzero coefficient */
+	  (*block)[pos] = (JCOEF) s;
+	  /* Remember its position in case we have to suspend */
+	  newnz_pos[num_newnz++] = pos;
+	}
+      }
+    }
+
+    if (EOBRUN > 0) {
+      /* Scan any remaining coefficient positions after the end-of-band
+       * (the last newly nonzero coefficient, if any).  Append a correction
+       * bit to each already-nonzero coefficient.  A correction bit is 1
+       * if the absolute value of the coefficient must be increased.
+       */
+      for (; k <= Se; k++) {
+	thiscoef = *block + jpeg_natural_order[k];
+	if (*thiscoef != 0) {
+	  CHECK_BIT_BUFFER(br_state, 1, goto undoit);
+	  if (GET_BITS(1)) {
+	    if ((*thiscoef & p1) == 0) { /* do nothing if already changed it */
+	      if (*thiscoef >= 0)
+		*thiscoef += p1;
+	      else
+		*thiscoef += m1;
+	    }
+	  }
+	}
+      }
+      /* Count one block completed in EOB run */
+      EOBRUN--;
+    }
+
+    /* Completed MCU, so update state */
+    BITREAD_SAVE_STATE(cinfo,entropy->bitstate);
+    entropy->saved.EOBRUN = EOBRUN; /* only part of saved state we need */
+  }
+
+  /* Account for restart interval (no-op if not using restarts) */
+  entropy->restarts_to_go--;
+
+  return TRUE;
+
+undoit:
+  /* Re-zero any output coefficients that we made newly nonzero */
+  while (num_newnz > 0)
+    (*block)[newnz_pos[--num_newnz]] = 0;
+
+  return FALSE;
+}
+
+
+/*
+ * Module initialization routine for progressive Huffman entropy decoding.
+ */
+
+GLOBAL(void)
+jinit_phuff_decoder (j_decompress_ptr cinfo)
+{
+  phuff_entropy_ptr entropy;
+  int *coef_bit_ptr;
+  int ci, i;
+
+  entropy = (phuff_entropy_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				SIZEOF(phuff_entropy_decoder));
+  cinfo->entropy = (struct jpeg_entropy_decoder *) entropy;
+  entropy->pub.start_pass = start_pass_phuff_decoder;
+
+  /* Mark derived tables unallocated */
+  for (i = 0; i < NUM_HUFF_TBLS; i++) {
+    entropy->derived_tbls[i] = NULL;
+  }
+
+  /* Create progression status table */
+  cinfo->coef_bits = (int (*)[DCTSIZE2])
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				cinfo->num_components*DCTSIZE2*SIZEOF(int));
+  coef_bit_ptr = & cinfo->coef_bits[0][0];
+  for (ci = 0; ci < cinfo->num_components; ci++) 
+    for (i = 0; i < DCTSIZE2; i++)
+      *coef_bit_ptr++ = -1;
+}
+
+#endif /* D_PROGRESSIVE_SUPPORTED */
diff --git a/src/libjpeg-turbo/jdpostct.c b/src/libjpeg-turbo/jdpostct.c
new file mode 100644
index 0000000..571563d
--- /dev/null
+++ b/src/libjpeg-turbo/jdpostct.c
@@ -0,0 +1,290 @@
+/*
+ * jdpostct.c
+ *
+ * Copyright (C) 1994-1996, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains the decompression postprocessing controller.
+ * This controller manages the upsampling, color conversion, and color
+ * quantization/reduction steps; specifically, it controls the buffering
+ * between upsample/color conversion and color quantization/reduction.
+ *
+ * If no color quantization/reduction is required, then this module has no
+ * work to do, and it just hands off to the upsample/color conversion code.
+ * An integrated upsample/convert/quantize process would replace this module
+ * entirely.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+
+
+/* Private buffer controller object */
+
+typedef struct {
+  struct jpeg_d_post_controller pub; /* public fields */
+
+  /* Color quantization source buffer: this holds output data from
+   * the upsample/color conversion step to be passed to the quantizer.
+   * For two-pass color quantization, we need a full-image buffer;
+   * for one-pass operation, a strip buffer is sufficient.
+   */
+  jvirt_sarray_ptr whole_image;	/* virtual array, or NULL if one-pass */
+  JSAMPARRAY buffer;		/* strip buffer, or current strip of virtual */
+  JDIMENSION strip_height;	/* buffer size in rows */
+  /* for two-pass mode only: */
+  JDIMENSION starting_row;	/* row # of first row in current strip */
+  JDIMENSION next_row;		/* index of next row to fill/empty in strip */
+} my_post_controller;
+
+typedef my_post_controller * my_post_ptr;
+
+
+/* Forward declarations */
+METHODDEF(void) post_process_1pass
+	JPP((j_decompress_ptr cinfo,
+	     JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
+	     JDIMENSION in_row_groups_avail,
+	     JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
+	     JDIMENSION out_rows_avail));
+#ifdef QUANT_2PASS_SUPPORTED
+METHODDEF(void) post_process_prepass
+	JPP((j_decompress_ptr cinfo,
+	     JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
+	     JDIMENSION in_row_groups_avail,
+	     JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
+	     JDIMENSION out_rows_avail));
+METHODDEF(void) post_process_2pass
+	JPP((j_decompress_ptr cinfo,
+	     JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
+	     JDIMENSION in_row_groups_avail,
+	     JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
+	     JDIMENSION out_rows_avail));
+#endif
+
+
+/*
+ * Initialize for a processing pass.
+ */
+
+METHODDEF(void)
+start_pass_dpost (j_decompress_ptr cinfo, J_BUF_MODE pass_mode)
+{
+  my_post_ptr post = (my_post_ptr) cinfo->post;
+
+  switch (pass_mode) {
+  case JBUF_PASS_THRU:
+    if (cinfo->quantize_colors) {
+      /* Single-pass processing with color quantization. */
+      post->pub.post_process_data = post_process_1pass;
+      /* We could be doing buffered-image output before starting a 2-pass
+       * color quantization; in that case, jinit_d_post_controller did not
+       * allocate a strip buffer.  Use the virtual-array buffer as workspace.
+       */
+      if (post->buffer == NULL) {
+	post->buffer = (*cinfo->mem->access_virt_sarray)
+	  ((j_common_ptr) cinfo, post->whole_image,
+	   (JDIMENSION) 0, post->strip_height, TRUE);
+      }
+    } else {
+      /* For single-pass processing without color quantization,
+       * I have no work to do; just call the upsampler directly.
+       */
+      post->pub.post_process_data = cinfo->upsample->upsample;
+    }
+    break;
+#ifdef QUANT_2PASS_SUPPORTED
+  case JBUF_SAVE_AND_PASS:
+    /* First pass of 2-pass quantization */
+    if (post->whole_image == NULL)
+      ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
+    post->pub.post_process_data = post_process_prepass;
+    break;
+  case JBUF_CRANK_DEST:
+    /* Second pass of 2-pass quantization */
+    if (post->whole_image == NULL)
+      ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
+    post->pub.post_process_data = post_process_2pass;
+    break;
+#endif /* QUANT_2PASS_SUPPORTED */
+  default:
+    ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
+    break;
+  }
+  post->starting_row = post->next_row = 0;
+}
+
+
+/*
+ * Process some data in the one-pass (strip buffer) case.
+ * This is used for color precision reduction as well as one-pass quantization.
+ */
+
+METHODDEF(void)
+post_process_1pass (j_decompress_ptr cinfo,
+		    JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
+		    JDIMENSION in_row_groups_avail,
+		    JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
+		    JDIMENSION out_rows_avail)
+{
+  my_post_ptr post = (my_post_ptr) cinfo->post;
+  JDIMENSION num_rows, max_rows;
+
+  /* Fill the buffer, but not more than what we can dump out in one go. */
+  /* Note we rely on the upsampler to detect bottom of image. */
+  max_rows = out_rows_avail - *out_row_ctr;
+  if (max_rows > post->strip_height)
+    max_rows = post->strip_height;
+  num_rows = 0;
+  (*cinfo->upsample->upsample) (cinfo,
+		input_buf, in_row_group_ctr, in_row_groups_avail,
+		post->buffer, &num_rows, max_rows);
+  /* Quantize and emit data. */
+  (*cinfo->cquantize->color_quantize) (cinfo,
+		post->buffer, output_buf + *out_row_ctr, (int) num_rows);
+  *out_row_ctr += num_rows;
+}
+
+
+#ifdef QUANT_2PASS_SUPPORTED
+
+/*
+ * Process some data in the first pass of 2-pass quantization.
+ */
+
+METHODDEF(void)
+post_process_prepass (j_decompress_ptr cinfo,
+		      JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
+		      JDIMENSION in_row_groups_avail,
+		      JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
+		      JDIMENSION out_rows_avail)
+{
+  my_post_ptr post = (my_post_ptr) cinfo->post;
+  JDIMENSION old_next_row, num_rows;
+
+  /* Reposition virtual buffer if at start of strip. */
+  if (post->next_row == 0) {
+    post->buffer = (*cinfo->mem->access_virt_sarray)
+	((j_common_ptr) cinfo, post->whole_image,
+	 post->starting_row, post->strip_height, TRUE);
+  }
+
+  /* Upsample some data (up to a strip height's worth). */
+  old_next_row = post->next_row;
+  (*cinfo->upsample->upsample) (cinfo,
+		input_buf, in_row_group_ctr, in_row_groups_avail,
+		post->buffer, &post->next_row, post->strip_height);
+
+  /* Allow quantizer to scan new data.  No data is emitted, */
+  /* but we advance out_row_ctr so outer loop can tell when we're done. */
+  if (post->next_row > old_next_row) {
+    num_rows = post->next_row - old_next_row;
+    (*cinfo->cquantize->color_quantize) (cinfo, post->buffer + old_next_row,
+					 (JSAMPARRAY) NULL, (int) num_rows);
+    *out_row_ctr += num_rows;
+  }
+
+  /* Advance if we filled the strip. */
+  if (post->next_row >= post->strip_height) {
+    post->starting_row += post->strip_height;
+    post->next_row = 0;
+  }
+}
+
+
+/*
+ * Process some data in the second pass of 2-pass quantization.
+ */
+
+METHODDEF(void)
+post_process_2pass (j_decompress_ptr cinfo,
+		    JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
+		    JDIMENSION in_row_groups_avail,
+		    JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
+		    JDIMENSION out_rows_avail)
+{
+  my_post_ptr post = (my_post_ptr) cinfo->post;
+  JDIMENSION num_rows, max_rows;
+
+  /* Reposition virtual buffer if at start of strip. */
+  if (post->next_row == 0) {
+    post->buffer = (*cinfo->mem->access_virt_sarray)
+	((j_common_ptr) cinfo, post->whole_image,
+	 post->starting_row, post->strip_height, FALSE);
+  }
+
+  /* Determine number of rows to emit. */
+  num_rows = post->strip_height - post->next_row; /* available in strip */
+  max_rows = out_rows_avail - *out_row_ctr; /* available in output area */
+  if (num_rows > max_rows)
+    num_rows = max_rows;
+  /* We have to check bottom of image here, can't depend on upsampler. */
+  max_rows = cinfo->output_height - post->starting_row;
+  if (num_rows > max_rows)
+    num_rows = max_rows;
+
+  /* Quantize and emit data. */
+  (*cinfo->cquantize->color_quantize) (cinfo,
+		post->buffer + post->next_row, output_buf + *out_row_ctr,
+		(int) num_rows);
+  *out_row_ctr += num_rows;
+
+  /* Advance if we filled the strip. */
+  post->next_row += num_rows;
+  if (post->next_row >= post->strip_height) {
+    post->starting_row += post->strip_height;
+    post->next_row = 0;
+  }
+}
+
+#endif /* QUANT_2PASS_SUPPORTED */
+
+
+/*
+ * Initialize postprocessing controller.
+ */
+
+GLOBAL(void)
+jinit_d_post_controller (j_decompress_ptr cinfo, boolean need_full_buffer)
+{
+  my_post_ptr post;
+
+  post = (my_post_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				SIZEOF(my_post_controller));
+  cinfo->post = (struct jpeg_d_post_controller *) post;
+  post->pub.start_pass = start_pass_dpost;
+  post->whole_image = NULL;	/* flag for no virtual arrays */
+  post->buffer = NULL;		/* flag for no strip buffer */
+
+  /* Create the quantization buffer, if needed */
+  if (cinfo->quantize_colors) {
+    /* The buffer strip height is max_v_samp_factor, which is typically
+     * an efficient number of rows for upsampling to return.
+     * (In the presence of output rescaling, we might want to be smarter?)
+     */
+    post->strip_height = (JDIMENSION) cinfo->max_v_samp_factor;
+    if (need_full_buffer) {
+      /* Two-pass color quantization: need full-image storage. */
+      /* We round up the number of rows to a multiple of the strip height. */
+#ifdef QUANT_2PASS_SUPPORTED
+      post->whole_image = (*cinfo->mem->request_virt_sarray)
+	((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE,
+	 cinfo->output_width * cinfo->out_color_components,
+	 (JDIMENSION) jround_up((long) cinfo->output_height,
+				(long) post->strip_height),
+	 post->strip_height);
+#else
+      ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
+#endif /* QUANT_2PASS_SUPPORTED */
+    } else {
+      /* One-pass color quantization: just make a strip buffer. */
+      post->buffer = (*cinfo->mem->alloc_sarray)
+	((j_common_ptr) cinfo, JPOOL_IMAGE,
+	 cinfo->output_width * cinfo->out_color_components,
+	 post->strip_height);
+    }
+  }
+}
diff --git a/src/libjpeg-turbo/jdsample.c b/src/libjpeg-turbo/jdsample.c
new file mode 100644
index 0000000..1864dd6
--- /dev/null
+++ b/src/libjpeg-turbo/jdsample.c
@@ -0,0 +1,496 @@
+/*
+ * jdsample.c
+ *
+ * Copyright (C) 1991-1996, Thomas G. Lane.
+ * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+ * Copyright (C) 2010, D. R. Commander.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains upsampling routines.
+ *
+ * Upsampling input data is counted in "row groups".  A row group
+ * is defined to be (v_samp_factor * DCT_scaled_size / min_DCT_scaled_size)
+ * sample rows of each component.  Upsampling will normally produce
+ * max_v_samp_factor pixel rows from each row group (but this could vary
+ * if the upsampler is applying a scale factor of its own).
+ *
+ * An excellent reference for image resampling is
+ *   Digital Image Warping, George Wolberg, 1990.
+ *   Pub. by IEEE Computer Society Press, Los Alamitos, CA. ISBN 0-8186-8944-7.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jsimd.h"
+#include "jpegcomp.h"
+
+
+/* Pointer to routine to upsample a single component */
+typedef JMETHOD(void, upsample1_ptr,
+		(j_decompress_ptr cinfo, jpeg_component_info * compptr,
+		 JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr));
+
+/* Private subobject */
+
+typedef struct {
+  struct jpeg_upsampler pub;	/* public fields */
+
+  /* Color conversion buffer.  When using separate upsampling and color
+   * conversion steps, this buffer holds one upsampled row group until it
+   * has been color converted and output.
+   * Note: we do not allocate any storage for component(s) which are full-size,
+   * ie do not need rescaling.  The corresponding entry of color_buf[] is
+   * simply set to point to the input data array, thereby avoiding copying.
+   */
+  JSAMPARRAY color_buf[MAX_COMPONENTS];
+
+  /* Per-component upsampling method pointers */
+  upsample1_ptr methods[MAX_COMPONENTS];
+
+  int next_row_out;		/* counts rows emitted from color_buf */
+  JDIMENSION rows_to_go;	/* counts rows remaining in image */
+
+  /* Height of an input row group for each component. */
+  int rowgroup_height[MAX_COMPONENTS];
+
+  /* These arrays save pixel expansion factors so that int_expand need not
+   * recompute them each time.  They are unused for other upsampling methods.
+   */
+  UINT8 h_expand[MAX_COMPONENTS];
+  UINT8 v_expand[MAX_COMPONENTS];
+} my_upsampler;
+
+typedef my_upsampler * my_upsample_ptr;
+
+
+/*
+ * Initialize for an upsampling pass.
+ */
+
+METHODDEF(void)
+start_pass_upsample (j_decompress_ptr cinfo)
+{
+  my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
+
+  /* Mark the conversion buffer empty */
+  upsample->next_row_out = cinfo->max_v_samp_factor;
+  /* Initialize total-height counter for detecting bottom of image */
+  upsample->rows_to_go = cinfo->output_height;
+}
+
+
+/*
+ * Control routine to do upsampling (and color conversion).
+ *
+ * In this version we upsample each component independently.
+ * We upsample one row group into the conversion buffer, then apply
+ * color conversion a row at a time.
+ */
+
+METHODDEF(void)
+sep_upsample (j_decompress_ptr cinfo,
+	      JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
+	      JDIMENSION in_row_groups_avail,
+	      JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
+	      JDIMENSION out_rows_avail)
+{
+  my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
+  int ci;
+  jpeg_component_info * compptr;
+  JDIMENSION num_rows;
+
+  /* Fill the conversion buffer, if it's empty */
+  if (upsample->next_row_out >= cinfo->max_v_samp_factor) {
+    for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+	 ci++, compptr++) {
+      /* Invoke per-component upsample method.  Notice we pass a POINTER
+       * to color_buf[ci], so that fullsize_upsample can change it.
+       */
+      (*upsample->methods[ci]) (cinfo, compptr,
+	input_buf[ci] + (*in_row_group_ctr * upsample->rowgroup_height[ci]),
+	upsample->color_buf + ci);
+    }
+    upsample->next_row_out = 0;
+  }
+
+  /* Color-convert and emit rows */
+
+  /* How many we have in the buffer: */
+  num_rows = (JDIMENSION) (cinfo->max_v_samp_factor - upsample->next_row_out);
+  /* Not more than the distance to the end of the image.  Need this test
+   * in case the image height is not a multiple of max_v_samp_factor:
+   */
+  if (num_rows > upsample->rows_to_go) 
+    num_rows = upsample->rows_to_go;
+  /* And not more than what the client can accept: */
+  out_rows_avail -= *out_row_ctr;
+  if (num_rows > out_rows_avail)
+    num_rows = out_rows_avail;
+
+  (*cinfo->cconvert->color_convert) (cinfo, upsample->color_buf,
+				     (JDIMENSION) upsample->next_row_out,
+				     output_buf + *out_row_ctr,
+				     (int) num_rows);
+
+  /* Adjust counts */
+  *out_row_ctr += num_rows;
+  upsample->rows_to_go -= num_rows;
+  upsample->next_row_out += num_rows;
+  /* When the buffer is emptied, declare this input row group consumed */
+  if (upsample->next_row_out >= cinfo->max_v_samp_factor)
+    (*in_row_group_ctr)++;
+}
+
+
+/*
+ * These are the routines invoked by sep_upsample to upsample pixel values
+ * of a single component.  One row group is processed per call.
+ */
+
+
+/*
+ * For full-size components, we just make color_buf[ci] point at the
+ * input buffer, and thus avoid copying any data.  Note that this is
+ * safe only because sep_upsample doesn't declare the input row group
+ * "consumed" until we are done color converting and emitting it.
+ */
+
+METHODDEF(void)
+fullsize_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr,
+		   JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr)
+{
+  *output_data_ptr = input_data;
+}
+
+
+/*
+ * This is a no-op version used for "uninteresting" components.
+ * These components will not be referenced by color conversion.
+ */
+
+METHODDEF(void)
+noop_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	       JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr)
+{
+  *output_data_ptr = NULL;	/* safety check */
+}
+
+
+/*
+ * This version handles any integral sampling ratios.
+ * This is not used for typical JPEG files, so it need not be fast.
+ * Nor, for that matter, is it particularly accurate: the algorithm is
+ * simple replication of the input pixel onto the corresponding output
+ * pixels.  The hi-falutin sampling literature refers to this as a
+ * "box filter".  A box filter tends to introduce visible artifacts,
+ * so if you are actually going to use 3:1 or 4:1 sampling ratios
+ * you would be well advised to improve this code.
+ */
+
+METHODDEF(void)
+int_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	      JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr)
+{
+  my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
+  JSAMPARRAY output_data = *output_data_ptr;
+  register JSAMPROW inptr, outptr;
+  register JSAMPLE invalue;
+  register int h;
+  JSAMPROW outend;
+  int h_expand, v_expand;
+  int inrow, outrow;
+
+  h_expand = upsample->h_expand[compptr->component_index];
+  v_expand = upsample->v_expand[compptr->component_index];
+
+  inrow = outrow = 0;
+  while (outrow < cinfo->max_v_samp_factor) {
+    /* Generate one output row with proper horizontal expansion */
+    inptr = input_data[inrow];
+    outptr = output_data[outrow];
+    outend = outptr + cinfo->output_width;
+    while (outptr < outend) {
+      invalue = *inptr++;	/* don't need GETJSAMPLE() here */
+      for (h = h_expand; h > 0; h--) {
+	*outptr++ = invalue;
+      }
+    }
+    /* Generate any additional output rows by duplicating the first one */
+    if (v_expand > 1) {
+      jcopy_sample_rows(output_data, outrow, output_data, outrow+1,
+			v_expand-1, cinfo->output_width);
+    }
+    inrow++;
+    outrow += v_expand;
+  }
+}
+
+
+/*
+ * Fast processing for the common case of 2:1 horizontal and 1:1 vertical.
+ * It's still a box filter.
+ */
+
+METHODDEF(void)
+h2v1_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	       JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr)
+{
+  JSAMPARRAY output_data = *output_data_ptr;
+  register JSAMPROW inptr, outptr;
+  register JSAMPLE invalue;
+  JSAMPROW outend;
+  int inrow;
+
+  for (inrow = 0; inrow < cinfo->max_v_samp_factor; inrow++) {
+    inptr = input_data[inrow];
+    outptr = output_data[inrow];
+    outend = outptr + cinfo->output_width;
+    while (outptr < outend) {
+      invalue = *inptr++;	/* don't need GETJSAMPLE() here */
+      *outptr++ = invalue;
+      *outptr++ = invalue;
+    }
+  }
+}
+
+
+/*
+ * Fast processing for the common case of 2:1 horizontal and 2:1 vertical.
+ * It's still a box filter.
+ */
+
+METHODDEF(void)
+h2v2_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	       JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr)
+{
+  JSAMPARRAY output_data = *output_data_ptr;
+  register JSAMPROW inptr, outptr;
+  register JSAMPLE invalue;
+  JSAMPROW outend;
+  int inrow, outrow;
+
+  inrow = outrow = 0;
+  while (outrow < cinfo->max_v_samp_factor) {
+    inptr = input_data[inrow];
+    outptr = output_data[outrow];
+    outend = outptr + cinfo->output_width;
+    while (outptr < outend) {
+      invalue = *inptr++;	/* don't need GETJSAMPLE() here */
+      *outptr++ = invalue;
+      *outptr++ = invalue;
+    }
+    jcopy_sample_rows(output_data, outrow, output_data, outrow+1,
+		      1, cinfo->output_width);
+    inrow++;
+    outrow += 2;
+  }
+}
+
+
+/*
+ * Fancy processing for the common case of 2:1 horizontal and 1:1 vertical.
+ *
+ * The upsampling algorithm is linear interpolation between pixel centers,
+ * also known as a "triangle filter".  This is a good compromise between
+ * speed and visual quality.  The centers of the output pixels are 1/4 and 3/4
+ * of the way between input pixel centers.
+ *
+ * A note about the "bias" calculations: when rounding fractional values to
+ * integer, we do not want to always round 0.5 up to the next integer.
+ * If we did that, we'd introduce a noticeable bias towards larger values.
+ * Instead, this code is arranged so that 0.5 will be rounded up or down at
+ * alternate pixel locations (a simple ordered dither pattern).
+ */
+
+METHODDEF(void)
+h2v1_fancy_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr,
+		     JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr)
+{
+  JSAMPARRAY output_data = *output_data_ptr;
+  register JSAMPROW inptr, outptr;
+  register int invalue;
+  register JDIMENSION colctr;
+  int inrow;
+
+  for (inrow = 0; inrow < cinfo->max_v_samp_factor; inrow++) {
+    inptr = input_data[inrow];
+    outptr = output_data[inrow];
+    /* Special case for first column */
+    invalue = GETJSAMPLE(*inptr++);
+    *outptr++ = (JSAMPLE) invalue;
+    *outptr++ = (JSAMPLE) ((invalue * 3 + GETJSAMPLE(*inptr) + 2) >> 2);
+
+    for (colctr = compptr->downsampled_width - 2; colctr > 0; colctr--) {
+      /* General case: 3/4 * nearer pixel + 1/4 * further pixel */
+      invalue = GETJSAMPLE(*inptr++) * 3;
+      *outptr++ = (JSAMPLE) ((invalue + GETJSAMPLE(inptr[-2]) + 1) >> 2);
+      *outptr++ = (JSAMPLE) ((invalue + GETJSAMPLE(*inptr) + 2) >> 2);
+    }
+
+    /* Special case for last column */
+    invalue = GETJSAMPLE(*inptr);
+    *outptr++ = (JSAMPLE) ((invalue * 3 + GETJSAMPLE(inptr[-1]) + 1) >> 2);
+    *outptr++ = (JSAMPLE) invalue;
+  }
+}
+
+
+/*
+ * Fancy processing for the common case of 2:1 horizontal and 2:1 vertical.
+ * Again a triangle filter; see comments for h2v1 case, above.
+ *
+ * It is OK for us to reference the adjacent input rows because we demanded
+ * context from the main buffer controller (see initialization code).
+ */
+
+METHODDEF(void)
+h2v2_fancy_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr,
+		     JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr)
+{
+  JSAMPARRAY output_data = *output_data_ptr;
+  register JSAMPROW inptr0, inptr1, outptr;
+#if BITS_IN_JSAMPLE == 8
+  register int thiscolsum, lastcolsum, nextcolsum;
+#else
+  register INT32 thiscolsum, lastcolsum, nextcolsum;
+#endif
+  register JDIMENSION colctr;
+  int inrow, outrow, v;
+
+  inrow = outrow = 0;
+  while (outrow < cinfo->max_v_samp_factor) {
+    for (v = 0; v < 2; v++) {
+      /* inptr0 points to nearest input row, inptr1 points to next nearest */
+      inptr0 = input_data[inrow];
+      if (v == 0)		/* next nearest is row above */
+	inptr1 = input_data[inrow-1];
+      else			/* next nearest is row below */
+	inptr1 = input_data[inrow+1];
+      outptr = output_data[outrow++];
+
+      /* Special case for first column */
+      thiscolsum = GETJSAMPLE(*inptr0++) * 3 + GETJSAMPLE(*inptr1++);
+      nextcolsum = GETJSAMPLE(*inptr0++) * 3 + GETJSAMPLE(*inptr1++);
+      *outptr++ = (JSAMPLE) ((thiscolsum * 4 + 8) >> 4);
+      *outptr++ = (JSAMPLE) ((thiscolsum * 3 + nextcolsum + 7) >> 4);
+      lastcolsum = thiscolsum; thiscolsum = nextcolsum;
+
+      for (colctr = compptr->downsampled_width - 2; colctr > 0; colctr--) {
+	/* General case: 3/4 * nearer pixel + 1/4 * further pixel in each */
+	/* dimension, thus 9/16, 3/16, 3/16, 1/16 overall */
+	nextcolsum = GETJSAMPLE(*inptr0++) * 3 + GETJSAMPLE(*inptr1++);
+	*outptr++ = (JSAMPLE) ((thiscolsum * 3 + lastcolsum + 8) >> 4);
+	*outptr++ = (JSAMPLE) ((thiscolsum * 3 + nextcolsum + 7) >> 4);
+	lastcolsum = thiscolsum; thiscolsum = nextcolsum;
+      }
+
+      /* Special case for last column */
+      *outptr++ = (JSAMPLE) ((thiscolsum * 3 + lastcolsum + 8) >> 4);
+      *outptr++ = (JSAMPLE) ((thiscolsum * 4 + 7) >> 4);
+    }
+    inrow++;
+  }
+}
+
+
+/*
+ * Module initialization routine for upsampling.
+ */
+
+GLOBAL(void)
+jinit_upsampler (j_decompress_ptr cinfo)
+{
+  my_upsample_ptr upsample;
+  int ci;
+  jpeg_component_info * compptr;
+  boolean need_buffer, do_fancy;
+  int h_in_group, v_in_group, h_out_group, v_out_group;
+
+  upsample = (my_upsample_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				SIZEOF(my_upsampler));
+  cinfo->upsample = (struct jpeg_upsampler *) upsample;
+  upsample->pub.start_pass = start_pass_upsample;
+  upsample->pub.upsample = sep_upsample;
+  upsample->pub.need_context_rows = FALSE; /* until we find out differently */
+
+  if (cinfo->CCIR601_sampling)	/* this isn't supported */
+    ERREXIT(cinfo, JERR_CCIR601_NOTIMPL);
+
+  /* jdmainct.c doesn't support context rows when min_DCT_scaled_size = 1,
+   * so don't ask for it.
+   */
+  do_fancy = cinfo->do_fancy_upsampling && cinfo->_min_DCT_scaled_size > 1;
+
+  /* Verify we can handle the sampling factors, select per-component methods,
+   * and create storage as needed.
+   */
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    /* Compute size of an "input group" after IDCT scaling.  This many samples
+     * are to be converted to max_h_samp_factor * max_v_samp_factor pixels.
+     */
+    h_in_group = (compptr->h_samp_factor * compptr->_DCT_scaled_size) /
+		 cinfo->_min_DCT_scaled_size;
+    v_in_group = (compptr->v_samp_factor * compptr->_DCT_scaled_size) /
+		 cinfo->_min_DCT_scaled_size;
+    h_out_group = cinfo->max_h_samp_factor;
+    v_out_group = cinfo->max_v_samp_factor;
+    upsample->rowgroup_height[ci] = v_in_group; /* save for use later */
+    need_buffer = TRUE;
+    if (! compptr->component_needed) {
+      /* Don't bother to upsample an uninteresting component. */
+      upsample->methods[ci] = noop_upsample;
+      need_buffer = FALSE;
+    } else if (h_in_group == h_out_group && v_in_group == v_out_group) {
+      /* Fullsize components can be processed without any work. */
+      upsample->methods[ci] = fullsize_upsample;
+      need_buffer = FALSE;
+    } else if (h_in_group * 2 == h_out_group &&
+	       v_in_group == v_out_group) {
+      /* Special cases for 2h1v upsampling */
+      if (do_fancy && compptr->downsampled_width > 2) {
+	if (jsimd_can_h2v1_fancy_upsample())
+	  upsample->methods[ci] = jsimd_h2v1_fancy_upsample;
+	else
+	  upsample->methods[ci] = h2v1_fancy_upsample;
+      } else {
+	if (jsimd_can_h2v1_upsample())
+	  upsample->methods[ci] = jsimd_h2v1_upsample;
+	else
+	  upsample->methods[ci] = h2v1_upsample;
+      }
+    } else if (h_in_group * 2 == h_out_group &&
+	       v_in_group * 2 == v_out_group) {
+      /* Special cases for 2h2v upsampling */
+      if (do_fancy && compptr->downsampled_width > 2) {
+	if (jsimd_can_h2v2_fancy_upsample())
+	  upsample->methods[ci] = jsimd_h2v2_fancy_upsample;
+	else
+	  upsample->methods[ci] = h2v2_fancy_upsample;
+	upsample->pub.need_context_rows = TRUE;
+      } else {
+	if (jsimd_can_h2v2_upsample())
+	  upsample->methods[ci] = jsimd_h2v2_upsample;
+	else
+	  upsample->methods[ci] = h2v2_upsample;
+      }
+    } else if ((h_out_group % h_in_group) == 0 &&
+	       (v_out_group % v_in_group) == 0) {
+      /* Generic integral-factors upsampling method */
+      upsample->methods[ci] = int_upsample;
+      upsample->h_expand[ci] = (UINT8) (h_out_group / h_in_group);
+      upsample->v_expand[ci] = (UINT8) (v_out_group / v_in_group);
+    } else
+      ERREXIT(cinfo, JERR_FRACT_SAMPLE_NOTIMPL);
+    if (need_buffer) {
+      upsample->color_buf[ci] = (*cinfo->mem->alloc_sarray)
+	((j_common_ptr) cinfo, JPOOL_IMAGE,
+	 (JDIMENSION) jround_up((long) cinfo->output_width,
+				(long) cinfo->max_h_samp_factor),
+	 (JDIMENSION) cinfo->max_v_samp_factor);
+    }
+  }
+}
diff --git a/src/libjpeg-turbo/jdtrans.c b/src/libjpeg-turbo/jdtrans.c
new file mode 100644
index 0000000..f0cd0ae
--- /dev/null
+++ b/src/libjpeg-turbo/jdtrans.c
@@ -0,0 +1,152 @@
+/*
+ * jdtrans.c
+ *
+ * Copyright (C) 1995-1997, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains library routines for transcoding decompression,
+ * that is, reading raw DCT coefficient arrays from an input JPEG file.
+ * The routines in jdapimin.c will also be needed by a transcoder.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+
+
+/* Forward declarations */
+LOCAL(void) transdecode_master_selection JPP((j_decompress_ptr cinfo));
+
+
+/*
+ * Read the coefficient arrays from a JPEG file.
+ * jpeg_read_header must be completed before calling this.
+ *
+ * The entire image is read into a set of virtual coefficient-block arrays,
+ * one per component.  The return value is a pointer to the array of
+ * virtual-array descriptors.  These can be manipulated directly via the
+ * JPEG memory manager, or handed off to jpeg_write_coefficients().
+ * To release the memory occupied by the virtual arrays, call
+ * jpeg_finish_decompress() when done with the data.
+ *
+ * An alternative usage is to simply obtain access to the coefficient arrays
+ * during a buffered-image-mode decompression operation.  This is allowed
+ * after any jpeg_finish_output() call.  The arrays can be accessed until
+ * jpeg_finish_decompress() is called.  (Note that any call to the library
+ * may reposition the arrays, so don't rely on access_virt_barray() results
+ * to stay valid across library calls.)
+ *
+ * Returns NULL if suspended.  This case need be checked only if
+ * a suspending data source is used.
+ */
+
+GLOBAL(jvirt_barray_ptr *)
+jpeg_read_coefficients (j_decompress_ptr cinfo)
+{
+  if (cinfo->global_state == DSTATE_READY) {
+    /* First call: initialize active modules */
+    transdecode_master_selection(cinfo);
+    cinfo->global_state = DSTATE_RDCOEFS;
+  }
+  if (cinfo->global_state == DSTATE_RDCOEFS) {
+    /* Absorb whole file into the coef buffer */
+    for (;;) {
+      int retcode;
+      /* Call progress monitor hook if present */
+      if (cinfo->progress != NULL)
+	(*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
+      /* Absorb some more input */
+      retcode = (*cinfo->inputctl->consume_input) (cinfo);
+      if (retcode == JPEG_SUSPENDED)
+	return NULL;
+      if (retcode == JPEG_REACHED_EOI)
+	break;
+      /* Advance progress counter if appropriate */
+      if (cinfo->progress != NULL &&
+	  (retcode == JPEG_ROW_COMPLETED || retcode == JPEG_REACHED_SOS)) {
+	if (++cinfo->progress->pass_counter >= cinfo->progress->pass_limit) {
+	  /* startup underestimated number of scans; ratchet up one scan */
+	  cinfo->progress->pass_limit += (long) cinfo->total_iMCU_rows;
+	}
+      }
+    }
+    /* Set state so that jpeg_finish_decompress does the right thing */
+    cinfo->global_state = DSTATE_STOPPING;
+  }
+  /* At this point we should be in state DSTATE_STOPPING if being used
+   * standalone, or in state DSTATE_BUFIMAGE if being invoked to get access
+   * to the coefficients during a full buffered-image-mode decompression.
+   */
+  if ((cinfo->global_state == DSTATE_STOPPING ||
+       cinfo->global_state == DSTATE_BUFIMAGE) && cinfo->buffered_image) {
+    return cinfo->coef->coef_arrays;
+  }
+  /* Oops, improper usage */
+  ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
+  return NULL;			/* keep compiler happy */
+}
+
+
+/*
+ * Master selection of decompression modules for transcoding.
+ * This substitutes for jdmaster.c's initialization of the full decompressor.
+ */
+
+LOCAL(void)
+transdecode_master_selection (j_decompress_ptr cinfo)
+{
+  /* This is effectively a buffered-image operation. */
+  cinfo->buffered_image = TRUE;
+
+#if JPEG_LIB_VERSION >= 80
+  /* Compute output image dimensions and related values. */
+  jpeg_core_output_dimensions(cinfo);
+#endif
+
+  /* Entropy decoding: either Huffman or arithmetic coding. */
+  if (cinfo->arith_code) {
+#ifdef D_ARITH_CODING_SUPPORTED
+    jinit_arith_decoder(cinfo);
+#else
+    ERREXIT(cinfo, JERR_ARITH_NOTIMPL);
+#endif
+  } else {
+    if (cinfo->progressive_mode) {
+#ifdef D_PROGRESSIVE_SUPPORTED
+      jinit_phuff_decoder(cinfo);
+#else
+      ERREXIT(cinfo, JERR_NOT_COMPILED);
+#endif
+    } else
+      jinit_huff_decoder(cinfo);
+  }
+
+  /* Always get a full-image coefficient buffer. */
+  jinit_d_coef_controller(cinfo, TRUE);
+
+  /* We can now tell the memory manager to allocate virtual arrays. */
+  (*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo);
+
+  /* Initialize input side of decompressor to consume first scan. */
+  (*cinfo->inputctl->start_input_pass) (cinfo);
+
+  /* Initialize progress monitoring. */
+  if (cinfo->progress != NULL) {
+    int nscans;
+    /* Estimate number of scans to set pass_limit. */
+    if (cinfo->progressive_mode) {
+      /* Arbitrarily estimate 2 interleaved DC scans + 3 AC scans/component. */
+      nscans = 2 + 3 * cinfo->num_components;
+    } else if (cinfo->inputctl->has_multiple_scans) {
+      /* For a nonprogressive multiscan file, estimate 1 scan per component. */
+      nscans = cinfo->num_components;
+    } else {
+      nscans = 1;
+    }
+    cinfo->progress->pass_counter = 0L;
+    cinfo->progress->pass_limit = (long) cinfo->total_iMCU_rows * nscans;
+    cinfo->progress->completed_passes = 0;
+    cinfo->progress->total_passes = 1;
+  }
+}
diff --git a/src/libjpeg-turbo/jerror.c b/src/libjpeg-turbo/jerror.c
new file mode 100644
index 0000000..3da7be8
--- /dev/null
+++ b/src/libjpeg-turbo/jerror.c
@@ -0,0 +1,252 @@
+/*
+ * jerror.c
+ *
+ * Copyright (C) 1991-1998, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains simple error-reporting and trace-message routines.
+ * These are suitable for Unix-like systems and others where writing to
+ * stderr is the right thing to do.  Many applications will want to replace
+ * some or all of these routines.
+ *
+ * If you define USE_WINDOWS_MESSAGEBOX in jconfig.h or in the makefile,
+ * you get a Windows-specific hack to display error messages in a dialog box.
+ * It ain't much, but it beats dropping error messages into the bit bucket,
+ * which is what happens to output to stderr under most Windows C compilers.
+ *
+ * These routines are used by both the compression and decompression code.
+ */
+
+/* this is not a core library module, so it doesn't define JPEG_INTERNALS */
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jversion.h"
+#include "jerror.h"
+
+#ifdef USE_WINDOWS_MESSAGEBOX
+#include <windows.h>
+#endif
+
+#ifndef EXIT_FAILURE		/* define exit() codes if not provided */
+#define EXIT_FAILURE  1
+#endif
+
+
+/*
+ * Create the message string table.
+ * We do this from the master message list in jerror.h by re-reading
+ * jerror.h with a suitable definition for macro JMESSAGE.
+ * The message table is made an external symbol just in case any applications
+ * want to refer to it directly.
+ */
+
+#ifdef NEED_SHORT_EXTERNAL_NAMES
+#define jpeg_std_message_table	jMsgTable
+#endif
+
+#define JMESSAGE(code,string)	string ,
+
+const char * const jpeg_std_message_table[] = {
+#include "jerror.h"
+  NULL
+};
+
+
+/*
+ * Error exit handler: must not return to caller.
+ *
+ * Applications may override this if they want to get control back after
+ * an error.  Typically one would longjmp somewhere instead of exiting.
+ * The setjmp buffer can be made a private field within an expanded error
+ * handler object.  Note that the info needed to generate an error message
+ * is stored in the error object, so you can generate the message now or
+ * later, at your convenience.
+ * You should make sure that the JPEG object is cleaned up (with jpeg_abort
+ * or jpeg_destroy) at some point.
+ */
+
+METHODDEF(void)
+error_exit (j_common_ptr cinfo)
+{
+  /* Always display the message */
+  (*cinfo->err->output_message) (cinfo);
+
+  /* Let the memory manager delete any temp files before we die */
+  jpeg_destroy(cinfo);
+
+  exit(EXIT_FAILURE);
+}
+
+
+/*
+ * Actual output of an error or trace message.
+ * Applications may override this method to send JPEG messages somewhere
+ * other than stderr.
+ *
+ * On Windows, printing to stderr is generally completely useless,
+ * so we provide optional code to produce an error-dialog popup.
+ * Most Windows applications will still prefer to override this routine,
+ * but if they don't, it'll do something at least marginally useful.
+ *
+ * NOTE: to use the library in an environment that doesn't support the
+ * C stdio library, you may have to delete the call to fprintf() entirely,
+ * not just not use this routine.
+ */
+
+METHODDEF(void)
+output_message (j_common_ptr cinfo)
+{
+  char buffer[JMSG_LENGTH_MAX];
+
+  /* Create the message */
+  (*cinfo->err->format_message) (cinfo, buffer);
+
+#ifdef USE_WINDOWS_MESSAGEBOX
+  /* Display it in a message dialog box */
+  MessageBox(GetActiveWindow(), buffer, "JPEG Library Error",
+	     MB_OK | MB_ICONERROR);
+#else
+  /* Send it to stderr, adding a newline */
+  fprintf(stderr, "%s\n", buffer);
+#endif
+}
+
+
+/*
+ * Decide whether to emit a trace or warning message.
+ * msg_level is one of:
+ *   -1: recoverable corrupt-data warning, may want to abort.
+ *    0: important advisory messages (always display to user).
+ *    1: first level of tracing detail.
+ *    2,3,...: successively more detailed tracing messages.
+ * An application might override this method if it wanted to abort on warnings
+ * or change the policy about which messages to display.
+ */
+
+METHODDEF(void)
+emit_message (j_common_ptr cinfo, int msg_level)
+{
+  struct jpeg_error_mgr * err = cinfo->err;
+
+  if (msg_level < 0) {
+    /* It's a warning message.  Since corrupt files may generate many warnings,
+     * the policy implemented here is to show only the first warning,
+     * unless trace_level >= 3.
+     */
+    if (err->num_warnings == 0 || err->trace_level >= 3)
+      (*err->output_message) (cinfo);
+    /* Always count warnings in num_warnings. */
+    err->num_warnings++;
+  } else {
+    /* It's a trace message.  Show it if trace_level >= msg_level. */
+    if (err->trace_level >= msg_level)
+      (*err->output_message) (cinfo);
+  }
+}
+
+
+/*
+ * Format a message string for the most recent JPEG error or message.
+ * The message is stored into buffer, which should be at least JMSG_LENGTH_MAX
+ * characters.  Note that no '\n' character is added to the string.
+ * Few applications should need to override this method.
+ */
+
+METHODDEF(void)
+format_message (j_common_ptr cinfo, char * buffer)
+{
+  struct jpeg_error_mgr * err = cinfo->err;
+  int msg_code = err->msg_code;
+  const char * msgtext = NULL;
+  const char * msgptr;
+  char ch;
+  boolean isstring;
+
+  /* Look up message string in proper table */
+  if (msg_code > 0 && msg_code <= err->last_jpeg_message) {
+    msgtext = err->jpeg_message_table[msg_code];
+  } else if (err->addon_message_table != NULL &&
+	     msg_code >= err->first_addon_message &&
+	     msg_code <= err->last_addon_message) {
+    msgtext = err->addon_message_table[msg_code - err->first_addon_message];
+  }
+
+  /* Defend against bogus message number */
+  if (msgtext == NULL) {
+    err->msg_parm.i[0] = msg_code;
+    msgtext = err->jpeg_message_table[0];
+  }
+
+  /* Check for string parameter, as indicated by %s in the message text */
+  isstring = FALSE;
+  msgptr = msgtext;
+  while ((ch = *msgptr++) != '\0') {
+    if (ch == '%') {
+      if (*msgptr == 's') isstring = TRUE;
+      break;
+    }
+  }
+
+  /* Format the message into the passed buffer */
+  if (isstring)
+    sprintf(buffer, msgtext, err->msg_parm.s);
+  else
+    sprintf(buffer, msgtext,
+	    err->msg_parm.i[0], err->msg_parm.i[1],
+	    err->msg_parm.i[2], err->msg_parm.i[3],
+	    err->msg_parm.i[4], err->msg_parm.i[5],
+	    err->msg_parm.i[6], err->msg_parm.i[7]);
+}
+
+
+/*
+ * Reset error state variables at start of a new image.
+ * This is called during compression startup to reset trace/error
+ * processing to default state, without losing any application-specific
+ * method pointers.  An application might possibly want to override
+ * this method if it has additional error processing state.
+ */
+
+METHODDEF(void)
+reset_error_mgr (j_common_ptr cinfo)
+{
+  cinfo->err->num_warnings = 0;
+  /* trace_level is not reset since it is an application-supplied parameter */
+  cinfo->err->msg_code = 0;	/* may be useful as a flag for "no error" */
+}
+
+
+/*
+ * Fill in the standard error-handling methods in a jpeg_error_mgr object.
+ * Typical call is:
+ *	struct jpeg_compress_struct cinfo;
+ *	struct jpeg_error_mgr err;
+ *
+ *	cinfo.err = jpeg_std_error(&err);
+ * after which the application may override some of the methods.
+ */
+
+GLOBAL(struct jpeg_error_mgr *)
+jpeg_std_error (struct jpeg_error_mgr * err)
+{
+  err->error_exit = error_exit;
+  err->emit_message = emit_message;
+  err->output_message = output_message;
+  err->format_message = format_message;
+  err->reset_error_mgr = reset_error_mgr;
+
+  err->trace_level = 0;		/* default = no tracing */
+  err->num_warnings = 0;	/* no warnings emitted yet */
+  err->msg_code = 0;		/* may be useful as a flag for "no error" */
+
+  /* Initialize message table pointers */
+  err->jpeg_message_table = jpeg_std_message_table;
+  err->last_jpeg_message = (int) JMSG_LASTMSGCODE - 1;
+
+  err->addon_message_table = NULL;
+  err->first_addon_message = 0;	/* for safety */
+  err->last_addon_message = 0;
+
+  return err;
+}
diff --git a/src/libjpeg-turbo/jerror.h b/src/libjpeg-turbo/jerror.h
new file mode 100644
index 0000000..275086e
--- /dev/null
+++ b/src/libjpeg-turbo/jerror.h
@@ -0,0 +1,314 @@
+/*
+ * jerror.h
+ *
+ * Copyright (C) 1994-1997, Thomas G. Lane.
+ * Modified 1997-2009 by Guido Vollbeding.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file defines the error and message codes for the JPEG library.
+ * Edit this file to add new codes, or to translate the message strings to
+ * some other language.
+ * A set of error-reporting macros are defined too.  Some applications using
+ * the JPEG library may wish to include this file to get the error codes
+ * and/or the macros.
+ */
+
+/*
+ * To define the enum list of message codes, include this file without
+ * defining macro JMESSAGE.  To create a message string table, include it
+ * again with a suitable JMESSAGE definition (see jerror.c for an example).
+ */
+#ifndef JMESSAGE
+#ifndef JERROR_H
+/* First time through, define the enum list */
+#define JMAKE_ENUM_LIST
+#else
+/* Repeated inclusions of this file are no-ops unless JMESSAGE is defined */
+#define JMESSAGE(code,string)
+#endif /* JERROR_H */
+#endif /* JMESSAGE */
+
+#ifdef JMAKE_ENUM_LIST
+
+typedef enum {
+
+#define JMESSAGE(code,string)	code ,
+
+#endif /* JMAKE_ENUM_LIST */
+
+JMESSAGE(JMSG_NOMESSAGE, "Bogus message code %d") /* Must be first entry! */
+
+/* For maintenance convenience, list is alphabetical by message code name */
+#if JPEG_LIB_VERSION < 70
+JMESSAGE(JERR_ARITH_NOTIMPL,
+	 "Sorry, arithmetic coding is not implemented")
+#endif
+JMESSAGE(JERR_BAD_ALIGN_TYPE, "ALIGN_TYPE is wrong, please fix")
+JMESSAGE(JERR_BAD_ALLOC_CHUNK, "MAX_ALLOC_CHUNK is wrong, please fix")
+JMESSAGE(JERR_BAD_BUFFER_MODE, "Bogus buffer control mode")
+JMESSAGE(JERR_BAD_COMPONENT_ID, "Invalid component ID %d in SOS")
+#if JPEG_LIB_VERSION >= 70
+JMESSAGE(JERR_BAD_CROP_SPEC, "Invalid crop request")
+#endif
+JMESSAGE(JERR_BAD_DCT_COEF, "DCT coefficient out of range")
+JMESSAGE(JERR_BAD_DCTSIZE, "IDCT output block size %d not supported")
+#if JPEG_LIB_VERSION >= 70
+JMESSAGE(JERR_BAD_DROP_SAMPLING,
+	 "Component index %d: mismatching sampling ratio %d:%d, %d:%d, %c")
+#endif
+JMESSAGE(JERR_BAD_HUFF_TABLE, "Bogus Huffman table definition")
+JMESSAGE(JERR_BAD_IN_COLORSPACE, "Bogus input colorspace")
+JMESSAGE(JERR_BAD_J_COLORSPACE, "Bogus JPEG colorspace")
+JMESSAGE(JERR_BAD_LENGTH, "Bogus marker length")
+JMESSAGE(JERR_BAD_LIB_VERSION,
+	 "Wrong JPEG library version: library is %d, caller expects %d")
+JMESSAGE(JERR_BAD_MCU_SIZE, "Sampling factors too large for interleaved scan")
+JMESSAGE(JERR_BAD_POOL_ID, "Invalid memory pool code %d")
+JMESSAGE(JERR_BAD_PRECISION, "Unsupported JPEG data precision %d")
+JMESSAGE(JERR_BAD_PROGRESSION,
+	 "Invalid progressive parameters Ss=%d Se=%d Ah=%d Al=%d")
+JMESSAGE(JERR_BAD_PROG_SCRIPT,
+	 "Invalid progressive parameters at scan script entry %d")
+JMESSAGE(JERR_BAD_SAMPLING, "Bogus sampling factors")
+JMESSAGE(JERR_BAD_SCAN_SCRIPT, "Invalid scan script at entry %d")
+JMESSAGE(JERR_BAD_STATE, "Improper call to JPEG library in state %d")
+JMESSAGE(JERR_BAD_STRUCT_SIZE,
+	 "JPEG parameter struct mismatch: library thinks size is %u, caller expects %u")
+JMESSAGE(JERR_BAD_VIRTUAL_ACCESS, "Bogus virtual array access")
+JMESSAGE(JERR_BUFFER_SIZE, "Buffer passed to JPEG library is too small")
+JMESSAGE(JERR_CANT_SUSPEND, "Suspension not allowed here")
+JMESSAGE(JERR_CCIR601_NOTIMPL, "CCIR601 sampling not implemented yet")
+JMESSAGE(JERR_COMPONENT_COUNT, "Too many color components: %d, max %d")
+JMESSAGE(JERR_CONVERSION_NOTIMPL, "Unsupported color conversion request")
+JMESSAGE(JERR_DAC_INDEX, "Bogus DAC index %d")
+JMESSAGE(JERR_DAC_VALUE, "Bogus DAC value 0x%x")
+JMESSAGE(JERR_DHT_INDEX, "Bogus DHT index %d")
+JMESSAGE(JERR_DQT_INDEX, "Bogus DQT index %d")
+JMESSAGE(JERR_EMPTY_IMAGE, "Empty JPEG image (DNL not supported)")
+JMESSAGE(JERR_EMS_READ, "Read from EMS failed")
+JMESSAGE(JERR_EMS_WRITE, "Write to EMS failed")
+JMESSAGE(JERR_EOI_EXPECTED, "Didn't expect more than one scan")
+JMESSAGE(JERR_FILE_READ, "Input file read error")
+JMESSAGE(JERR_FILE_WRITE, "Output file write error --- out of disk space?")
+JMESSAGE(JERR_FRACT_SAMPLE_NOTIMPL, "Fractional sampling not implemented yet")
+JMESSAGE(JERR_HUFF_CLEN_OVERFLOW, "Huffman code size table overflow")
+JMESSAGE(JERR_HUFF_MISSING_CODE, "Missing Huffman code table entry")
+JMESSAGE(JERR_IMAGE_TOO_BIG, "Maximum supported image dimension is %u pixels")
+JMESSAGE(JERR_INPUT_EMPTY, "Empty input file")
+JMESSAGE(JERR_INPUT_EOF, "Premature end of input file")
+JMESSAGE(JERR_MISMATCHED_QUANT_TABLE,
+	 "Cannot transcode due to multiple use of quantization table %d")
+JMESSAGE(JERR_MISSING_DATA, "Scan script does not transmit all data")
+JMESSAGE(JERR_MODE_CHANGE, "Invalid color quantization mode change")
+JMESSAGE(JERR_NOTIMPL, "Not implemented yet")
+JMESSAGE(JERR_NOT_COMPILED, "Requested feature was omitted at compile time")
+#if JPEG_LIB_VERSION >= 70
+JMESSAGE(JERR_NO_ARITH_TABLE, "Arithmetic table 0x%02x was not defined")
+#endif
+JMESSAGE(JERR_NO_BACKING_STORE, "Backing store not supported")
+JMESSAGE(JERR_NO_HUFF_TABLE, "Huffman table 0x%02x was not defined")
+JMESSAGE(JERR_NO_IMAGE, "JPEG datastream contains no image")
+JMESSAGE(JERR_NO_QUANT_TABLE, "Quantization table 0x%02x was not defined")
+JMESSAGE(JERR_NO_SOI, "Not a JPEG file: starts with 0x%02x 0x%02x")
+JMESSAGE(JERR_OUT_OF_MEMORY, "Insufficient memory (case %d)")
+JMESSAGE(JERR_QUANT_COMPONENTS,
+	 "Cannot quantize more than %d color components")
+JMESSAGE(JERR_QUANT_FEW_COLORS, "Cannot quantize to fewer than %d colors")
+JMESSAGE(JERR_QUANT_MANY_COLORS, "Cannot quantize to more than %d colors")
+JMESSAGE(JERR_SOF_DUPLICATE, "Invalid JPEG file structure: two SOF markers")
+JMESSAGE(JERR_SOF_NO_SOS, "Invalid JPEG file structure: missing SOS marker")
+JMESSAGE(JERR_SOF_UNSUPPORTED, "Unsupported JPEG process: SOF type 0x%02x")
+JMESSAGE(JERR_SOI_DUPLICATE, "Invalid JPEG file structure: two SOI markers")
+JMESSAGE(JERR_SOS_NO_SOF, "Invalid JPEG file structure: SOS before SOF")
+JMESSAGE(JERR_TFILE_CREATE, "Failed to create temporary file %s")
+JMESSAGE(JERR_TFILE_READ, "Read failed on temporary file")
+JMESSAGE(JERR_TFILE_SEEK, "Seek failed on temporary file")
+JMESSAGE(JERR_TFILE_WRITE,
+	 "Write failed on temporary file --- out of disk space?")
+JMESSAGE(JERR_TOO_LITTLE_DATA, "Application transferred too few scanlines")
+JMESSAGE(JERR_UNKNOWN_MARKER, "Unsupported marker type 0x%02x")
+JMESSAGE(JERR_VIRTUAL_BUG, "Virtual array controller messed up")
+JMESSAGE(JERR_WIDTH_OVERFLOW, "Image too wide for this implementation")
+JMESSAGE(JERR_XMS_READ, "Read from XMS failed")
+JMESSAGE(JERR_XMS_WRITE, "Write to XMS failed")
+JMESSAGE(JMSG_COPYRIGHT, JCOPYRIGHT)
+JMESSAGE(JMSG_VERSION, JVERSION)
+JMESSAGE(JTRC_16BIT_TABLES,
+	 "Caution: quantization tables are too coarse for baseline JPEG")
+JMESSAGE(JTRC_ADOBE,
+	 "Adobe APP14 marker: version %d, flags 0x%04x 0x%04x, transform %d")
+JMESSAGE(JTRC_APP0, "Unknown APP0 marker (not JFIF), length %u")
+JMESSAGE(JTRC_APP14, "Unknown APP14 marker (not Adobe), length %u")
+JMESSAGE(JTRC_DAC, "Define Arithmetic Table 0x%02x: 0x%02x")
+JMESSAGE(JTRC_DHT, "Define Huffman Table 0x%02x")
+JMESSAGE(JTRC_DQT, "Define Quantization Table %d  precision %d")
+JMESSAGE(JTRC_DRI, "Define Restart Interval %u")
+JMESSAGE(JTRC_EMS_CLOSE, "Freed EMS handle %u")
+JMESSAGE(JTRC_EMS_OPEN, "Obtained EMS handle %u")
+JMESSAGE(JTRC_EOI, "End Of Image")
+JMESSAGE(JTRC_HUFFBITS, "        %3d %3d %3d %3d %3d %3d %3d %3d")
+JMESSAGE(JTRC_JFIF, "JFIF APP0 marker: version %d.%02d, density %dx%d  %d")
+JMESSAGE(JTRC_JFIF_BADTHUMBNAILSIZE,
+	 "Warning: thumbnail image size does not match data length %u")
+JMESSAGE(JTRC_JFIF_EXTENSION,
+	 "JFIF extension marker: type 0x%02x, length %u")
+JMESSAGE(JTRC_JFIF_THUMBNAIL, "    with %d x %d thumbnail image")
+JMESSAGE(JTRC_MISC_MARKER, "Miscellaneous marker 0x%02x, length %u")
+JMESSAGE(JTRC_PARMLESS_MARKER, "Unexpected marker 0x%02x")
+JMESSAGE(JTRC_QUANTVALS, "        %4u %4u %4u %4u %4u %4u %4u %4u")
+JMESSAGE(JTRC_QUANT_3_NCOLORS, "Quantizing to %d = %d*%d*%d colors")
+JMESSAGE(JTRC_QUANT_NCOLORS, "Quantizing to %d colors")
+JMESSAGE(JTRC_QUANT_SELECTED, "Selected %d colors for quantization")
+JMESSAGE(JTRC_RECOVERY_ACTION, "At marker 0x%02x, recovery action %d")
+JMESSAGE(JTRC_RST, "RST%d")
+JMESSAGE(JTRC_SMOOTH_NOTIMPL,
+	 "Smoothing not supported with nonstandard sampling ratios")
+JMESSAGE(JTRC_SOF, "Start Of Frame 0x%02x: width=%u, height=%u, components=%d")
+JMESSAGE(JTRC_SOF_COMPONENT, "    Component %d: %dhx%dv q=%d")
+JMESSAGE(JTRC_SOI, "Start of Image")
+JMESSAGE(JTRC_SOS, "Start Of Scan: %d components")
+JMESSAGE(JTRC_SOS_COMPONENT, "    Component %d: dc=%d ac=%d")
+JMESSAGE(JTRC_SOS_PARAMS, "  Ss=%d, Se=%d, Ah=%d, Al=%d")
+JMESSAGE(JTRC_TFILE_CLOSE, "Closed temporary file %s")
+JMESSAGE(JTRC_TFILE_OPEN, "Opened temporary file %s")
+JMESSAGE(JTRC_THUMB_JPEG,
+	 "JFIF extension marker: JPEG-compressed thumbnail image, length %u")
+JMESSAGE(JTRC_THUMB_PALETTE,
+	 "JFIF extension marker: palette thumbnail image, length %u")
+JMESSAGE(JTRC_THUMB_RGB,
+	 "JFIF extension marker: RGB thumbnail image, length %u")
+JMESSAGE(JTRC_UNKNOWN_IDS,
+	 "Unrecognized component IDs %d %d %d, assuming YCbCr")
+JMESSAGE(JTRC_XMS_CLOSE, "Freed XMS handle %u")
+JMESSAGE(JTRC_XMS_OPEN, "Obtained XMS handle %u")
+JMESSAGE(JWRN_ADOBE_XFORM, "Unknown Adobe color transform code %d")
+#if JPEG_LIB_VERSION >= 70
+JMESSAGE(JWRN_ARITH_BAD_CODE, "Corrupt JPEG data: bad arithmetic code")
+#endif
+JMESSAGE(JWRN_BOGUS_PROGRESSION,
+	 "Inconsistent progression sequence for component %d coefficient %d")
+JMESSAGE(JWRN_EXTRANEOUS_DATA,
+	 "Corrupt JPEG data: %u extraneous bytes before marker 0x%02x")
+JMESSAGE(JWRN_HIT_MARKER, "Corrupt JPEG data: premature end of data segment")
+JMESSAGE(JWRN_HUFF_BAD_CODE, "Corrupt JPEG data: bad Huffman code")
+JMESSAGE(JWRN_JFIF_MAJOR, "Warning: unknown JFIF revision number %d.%02d")
+JMESSAGE(JWRN_JPEG_EOF, "Premature end of JPEG file")
+JMESSAGE(JWRN_MUST_RESYNC,
+	 "Corrupt JPEG data: found marker 0x%02x instead of RST%d")
+JMESSAGE(JWRN_NOT_SEQUENTIAL, "Invalid SOS parameters for sequential JPEG")
+JMESSAGE(JWRN_TOO_MUCH_DATA, "Application transferred too many scanlines")
+#if JPEG_LIB_VERSION < 70
+JMESSAGE(JERR_BAD_CROP_SPEC, "Invalid crop request")
+#if defined(C_ARITH_CODING_SUPPORTED) || defined(D_ARITH_CODING_SUPPORTED)
+JMESSAGE(JERR_NO_ARITH_TABLE, "Arithmetic table 0x%02x was not defined")
+JMESSAGE(JWRN_ARITH_BAD_CODE, "Corrupt JPEG data: bad arithmetic code")
+#endif
+#endif
+
+#ifdef JMAKE_ENUM_LIST
+
+  JMSG_LASTMSGCODE
+} J_MESSAGE_CODE;
+
+#undef JMAKE_ENUM_LIST
+#endif /* JMAKE_ENUM_LIST */
+
+/* Zap JMESSAGE macro so that future re-inclusions do nothing by default */
+#undef JMESSAGE
+
+
+#ifndef JERROR_H
+#define JERROR_H
+
+/* Macros to simplify using the error and trace message stuff */
+/* The first parameter is either type of cinfo pointer */
+
+/* Fatal errors (print message and exit) */
+#define ERREXIT(cinfo,code)  \
+  ((cinfo)->err->msg_code = (code), \
+   (*(cinfo)->err->error_exit) ((j_common_ptr) (cinfo)))
+#define ERREXIT1(cinfo,code,p1)  \
+  ((cinfo)->err->msg_code = (code), \
+   (cinfo)->err->msg_parm.i[0] = (p1), \
+   (*(cinfo)->err->error_exit) ((j_common_ptr) (cinfo)))
+#define ERREXIT2(cinfo,code,p1,p2)  \
+  ((cinfo)->err->msg_code = (code), \
+   (cinfo)->err->msg_parm.i[0] = (p1), \
+   (cinfo)->err->msg_parm.i[1] = (p2), \
+   (*(cinfo)->err->error_exit) ((j_common_ptr) (cinfo)))
+#define ERREXIT3(cinfo,code,p1,p2,p3)  \
+  ((cinfo)->err->msg_code = (code), \
+   (cinfo)->err->msg_parm.i[0] = (p1), \
+   (cinfo)->err->msg_parm.i[1] = (p2), \
+   (cinfo)->err->msg_parm.i[2] = (p3), \
+   (*(cinfo)->err->error_exit) ((j_common_ptr) (cinfo)))
+#define ERREXIT4(cinfo,code,p1,p2,p3,p4)  \
+  ((cinfo)->err->msg_code = (code), \
+   (cinfo)->err->msg_parm.i[0] = (p1), \
+   (cinfo)->err->msg_parm.i[1] = (p2), \
+   (cinfo)->err->msg_parm.i[2] = (p3), \
+   (cinfo)->err->msg_parm.i[3] = (p4), \
+   (*(cinfo)->err->error_exit) ((j_common_ptr) (cinfo)))
+#define ERREXITS(cinfo,code,str)  \
+  ((cinfo)->err->msg_code = (code), \
+   strncpy((cinfo)->err->msg_parm.s, (str), JMSG_STR_PARM_MAX), \
+   (*(cinfo)->err->error_exit) ((j_common_ptr) (cinfo)))
+
+#define MAKESTMT(stuff)		do { stuff } while (0)
+
+/* Nonfatal errors (we can keep going, but the data is probably corrupt) */
+#define WARNMS(cinfo,code)  \
+  ((cinfo)->err->msg_code = (code), \
+   (*(cinfo)->err->emit_message) ((j_common_ptr) (cinfo), -1))
+#define WARNMS1(cinfo,code,p1)  \
+  ((cinfo)->err->msg_code = (code), \
+   (cinfo)->err->msg_parm.i[0] = (p1), \
+   (*(cinfo)->err->emit_message) ((j_common_ptr) (cinfo), -1))
+#define WARNMS2(cinfo,code,p1,p2)  \
+  ((cinfo)->err->msg_code = (code), \
+   (cinfo)->err->msg_parm.i[0] = (p1), \
+   (cinfo)->err->msg_parm.i[1] = (p2), \
+   (*(cinfo)->err->emit_message) ((j_common_ptr) (cinfo), -1))
+
+/* Informational/debugging messages */
+#define TRACEMS(cinfo,lvl,code)  \
+  ((cinfo)->err->msg_code = (code), \
+   (*(cinfo)->err->emit_message) ((j_common_ptr) (cinfo), (lvl)))
+#define TRACEMS1(cinfo,lvl,code,p1)  \
+  ((cinfo)->err->msg_code = (code), \
+   (cinfo)->err->msg_parm.i[0] = (p1), \
+   (*(cinfo)->err->emit_message) ((j_common_ptr) (cinfo), (lvl)))
+#define TRACEMS2(cinfo,lvl,code,p1,p2)  \
+  ((cinfo)->err->msg_code = (code), \
+   (cinfo)->err->msg_parm.i[0] = (p1), \
+   (cinfo)->err->msg_parm.i[1] = (p2), \
+   (*(cinfo)->err->emit_message) ((j_common_ptr) (cinfo), (lvl)))
+#define TRACEMS3(cinfo,lvl,code,p1,p2,p3)  \
+  MAKESTMT(int * _mp = (cinfo)->err->msg_parm.i; \
+	   _mp[0] = (p1); _mp[1] = (p2); _mp[2] = (p3); \
+	   (cinfo)->err->msg_code = (code); \
+	   (*(cinfo)->err->emit_message) ((j_common_ptr) (cinfo), (lvl)); )
+#define TRACEMS4(cinfo,lvl,code,p1,p2,p3,p4)  \
+  MAKESTMT(int * _mp = (cinfo)->err->msg_parm.i; \
+	   _mp[0] = (p1); _mp[1] = (p2); _mp[2] = (p3); _mp[3] = (p4); \
+	   (cinfo)->err->msg_code = (code); \
+	   (*(cinfo)->err->emit_message) ((j_common_ptr) (cinfo), (lvl)); )
+#define TRACEMS5(cinfo,lvl,code,p1,p2,p3,p4,p5)  \
+  MAKESTMT(int * _mp = (cinfo)->err->msg_parm.i; \
+	   _mp[0] = (p1); _mp[1] = (p2); _mp[2] = (p3); _mp[3] = (p4); \
+	   _mp[4] = (p5); \
+	   (cinfo)->err->msg_code = (code); \
+	   (*(cinfo)->err->emit_message) ((j_common_ptr) (cinfo), (lvl)); )
+#define TRACEMS8(cinfo,lvl,code,p1,p2,p3,p4,p5,p6,p7,p8)  \
+  MAKESTMT(int * _mp = (cinfo)->err->msg_parm.i; \
+	   _mp[0] = (p1); _mp[1] = (p2); _mp[2] = (p3); _mp[3] = (p4); \
+	   _mp[4] = (p5); _mp[5] = (p6); _mp[6] = (p7); _mp[7] = (p8); \
+	   (cinfo)->err->msg_code = (code); \
+	   (*(cinfo)->err->emit_message) ((j_common_ptr) (cinfo), (lvl)); )
+#define TRACEMSS(cinfo,lvl,code,str)  \
+  ((cinfo)->err->msg_code = (code), \
+   strncpy((cinfo)->err->msg_parm.s, (str), JMSG_STR_PARM_MAX), \
+   (*(cinfo)->err->emit_message) ((j_common_ptr) (cinfo), (lvl)))
+
+#endif /* JERROR_H */
diff --git a/src/libjpeg-turbo/jfdctflt.c b/src/libjpeg-turbo/jfdctflt.c
new file mode 100644
index 0000000..79d7a00
--- /dev/null
+++ b/src/libjpeg-turbo/jfdctflt.c
@@ -0,0 +1,168 @@
+/*
+ * jfdctflt.c
+ *
+ * Copyright (C) 1994-1996, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains a floating-point implementation of the
+ * forward DCT (Discrete Cosine Transform).
+ *
+ * This implementation should be more accurate than either of the integer
+ * DCT implementations.  However, it may not give the same results on all
+ * machines because of differences in roundoff behavior.  Speed will depend
+ * on the hardware's floating point capacity.
+ *
+ * A 2-D DCT can be done by 1-D DCT on each row followed by 1-D DCT
+ * on each column.  Direct algorithms are also available, but they are
+ * much more complex and seem not to be any faster when reduced to code.
+ *
+ * This implementation is based on Arai, Agui, and Nakajima's algorithm for
+ * scaled DCT.  Their original paper (Trans. IEICE E-71(11):1095) is in
+ * Japanese, but the algorithm is described in the Pennebaker & Mitchell
+ * JPEG textbook (see REFERENCES section in file README).  The following code
+ * is based directly on figure 4-8 in P&M.
+ * While an 8-point DCT cannot be done in less than 11 multiplies, it is
+ * possible to arrange the computation so that many of the multiplies are
+ * simple scalings of the final outputs.  These multiplies can then be
+ * folded into the multiplications or divisions by the JPEG quantization
+ * table entries.  The AA&N method leaves only 5 multiplies and 29 adds
+ * to be done in the DCT itself.
+ * The primary disadvantage of this method is that with a fixed-point
+ * implementation, accuracy is lost due to imprecise representation of the
+ * scaled quantization values.  However, that problem does not arise if
+ * we use floating point arithmetic.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jdct.h"		/* Private declarations for DCT subsystem */
+
+#ifdef DCT_FLOAT_SUPPORTED
+
+
+/*
+ * This module is specialized to the case DCTSIZE = 8.
+ */
+
+#if DCTSIZE != 8
+  Sorry, this code only copes with 8x8 DCTs. /* deliberate syntax err */
+#endif
+
+
+/*
+ * Perform the forward DCT on one block of samples.
+ */
+
+GLOBAL(void)
+jpeg_fdct_float (FAST_FLOAT * data)
+{
+  FAST_FLOAT tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
+  FAST_FLOAT tmp10, tmp11, tmp12, tmp13;
+  FAST_FLOAT z1, z2, z3, z4, z5, z11, z13;
+  FAST_FLOAT *dataptr;
+  int ctr;
+
+  /* Pass 1: process rows. */
+
+  dataptr = data;
+  for (ctr = DCTSIZE-1; ctr >= 0; ctr--) {
+    tmp0 = dataptr[0] + dataptr[7];
+    tmp7 = dataptr[0] - dataptr[7];
+    tmp1 = dataptr[1] + dataptr[6];
+    tmp6 = dataptr[1] - dataptr[6];
+    tmp2 = dataptr[2] + dataptr[5];
+    tmp5 = dataptr[2] - dataptr[5];
+    tmp3 = dataptr[3] + dataptr[4];
+    tmp4 = dataptr[3] - dataptr[4];
+    
+    /* Even part */
+    
+    tmp10 = tmp0 + tmp3;	/* phase 2 */
+    tmp13 = tmp0 - tmp3;
+    tmp11 = tmp1 + tmp2;
+    tmp12 = tmp1 - tmp2;
+    
+    dataptr[0] = tmp10 + tmp11; /* phase 3 */
+    dataptr[4] = tmp10 - tmp11;
+    
+    z1 = (tmp12 + tmp13) * ((FAST_FLOAT) 0.707106781); /* c4 */
+    dataptr[2] = tmp13 + z1;	/* phase 5 */
+    dataptr[6] = tmp13 - z1;
+    
+    /* Odd part */
+
+    tmp10 = tmp4 + tmp5;	/* phase 2 */
+    tmp11 = tmp5 + tmp6;
+    tmp12 = tmp6 + tmp7;
+
+    /* The rotator is modified from fig 4-8 to avoid extra negations. */
+    z5 = (tmp10 - tmp12) * ((FAST_FLOAT) 0.382683433); /* c6 */
+    z2 = ((FAST_FLOAT) 0.541196100) * tmp10 + z5; /* c2-c6 */
+    z4 = ((FAST_FLOAT) 1.306562965) * tmp12 + z5; /* c2+c6 */
+    z3 = tmp11 * ((FAST_FLOAT) 0.707106781); /* c4 */
+
+    z11 = tmp7 + z3;		/* phase 5 */
+    z13 = tmp7 - z3;
+
+    dataptr[5] = z13 + z2;	/* phase 6 */
+    dataptr[3] = z13 - z2;
+    dataptr[1] = z11 + z4;
+    dataptr[7] = z11 - z4;
+
+    dataptr += DCTSIZE;		/* advance pointer to next row */
+  }
+
+  /* Pass 2: process columns. */
+
+  dataptr = data;
+  for (ctr = DCTSIZE-1; ctr >= 0; ctr--) {
+    tmp0 = dataptr[DCTSIZE*0] + dataptr[DCTSIZE*7];
+    tmp7 = dataptr[DCTSIZE*0] - dataptr[DCTSIZE*7];
+    tmp1 = dataptr[DCTSIZE*1] + dataptr[DCTSIZE*6];
+    tmp6 = dataptr[DCTSIZE*1] - dataptr[DCTSIZE*6];
+    tmp2 = dataptr[DCTSIZE*2] + dataptr[DCTSIZE*5];
+    tmp5 = dataptr[DCTSIZE*2] - dataptr[DCTSIZE*5];
+    tmp3 = dataptr[DCTSIZE*3] + dataptr[DCTSIZE*4];
+    tmp4 = dataptr[DCTSIZE*3] - dataptr[DCTSIZE*4];
+    
+    /* Even part */
+    
+    tmp10 = tmp0 + tmp3;	/* phase 2 */
+    tmp13 = tmp0 - tmp3;
+    tmp11 = tmp1 + tmp2;
+    tmp12 = tmp1 - tmp2;
+    
+    dataptr[DCTSIZE*0] = tmp10 + tmp11; /* phase 3 */
+    dataptr[DCTSIZE*4] = tmp10 - tmp11;
+    
+    z1 = (tmp12 + tmp13) * ((FAST_FLOAT) 0.707106781); /* c4 */
+    dataptr[DCTSIZE*2] = tmp13 + z1; /* phase 5 */
+    dataptr[DCTSIZE*6] = tmp13 - z1;
+    
+    /* Odd part */
+
+    tmp10 = tmp4 + tmp5;	/* phase 2 */
+    tmp11 = tmp5 + tmp6;
+    tmp12 = tmp6 + tmp7;
+
+    /* The rotator is modified from fig 4-8 to avoid extra negations. */
+    z5 = (tmp10 - tmp12) * ((FAST_FLOAT) 0.382683433); /* c6 */
+    z2 = ((FAST_FLOAT) 0.541196100) * tmp10 + z5; /* c2-c6 */
+    z4 = ((FAST_FLOAT) 1.306562965) * tmp12 + z5; /* c2+c6 */
+    z3 = tmp11 * ((FAST_FLOAT) 0.707106781); /* c4 */
+
+    z11 = tmp7 + z3;		/* phase 5 */
+    z13 = tmp7 - z3;
+
+    dataptr[DCTSIZE*5] = z13 + z2; /* phase 6 */
+    dataptr[DCTSIZE*3] = z13 - z2;
+    dataptr[DCTSIZE*1] = z11 + z4;
+    dataptr[DCTSIZE*7] = z11 - z4;
+
+    dataptr++;			/* advance pointer to next column */
+  }
+}
+
+#endif /* DCT_FLOAT_SUPPORTED */
diff --git a/src/libjpeg-turbo/jfdctfst.c b/src/libjpeg-turbo/jfdctfst.c
new file mode 100644
index 0000000..ccb378a
--- /dev/null
+++ b/src/libjpeg-turbo/jfdctfst.c
@@ -0,0 +1,224 @@
+/*
+ * jfdctfst.c
+ *
+ * Copyright (C) 1994-1996, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains a fast, not so accurate integer implementation of the
+ * forward DCT (Discrete Cosine Transform).
+ *
+ * A 2-D DCT can be done by 1-D DCT on each row followed by 1-D DCT
+ * on each column.  Direct algorithms are also available, but they are
+ * much more complex and seem not to be any faster when reduced to code.
+ *
+ * This implementation is based on Arai, Agui, and Nakajima's algorithm for
+ * scaled DCT.  Their original paper (Trans. IEICE E-71(11):1095) is in
+ * Japanese, but the algorithm is described in the Pennebaker & Mitchell
+ * JPEG textbook (see REFERENCES section in file README).  The following code
+ * is based directly on figure 4-8 in P&M.
+ * While an 8-point DCT cannot be done in less than 11 multiplies, it is
+ * possible to arrange the computation so that many of the multiplies are
+ * simple scalings of the final outputs.  These multiplies can then be
+ * folded into the multiplications or divisions by the JPEG quantization
+ * table entries.  The AA&N method leaves only 5 multiplies and 29 adds
+ * to be done in the DCT itself.
+ * The primary disadvantage of this method is that with fixed-point math,
+ * accuracy is lost due to imprecise representation of the scaled
+ * quantization values.  The smaller the quantization table entry, the less
+ * precise the scaled value, so this implementation does worse with high-
+ * quality-setting files than with low-quality ones.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jdct.h"		/* Private declarations for DCT subsystem */
+
+#ifdef DCT_IFAST_SUPPORTED
+
+
+/*
+ * This module is specialized to the case DCTSIZE = 8.
+ */
+
+#if DCTSIZE != 8
+  Sorry, this code only copes with 8x8 DCTs. /* deliberate syntax err */
+#endif
+
+
+/* Scaling decisions are generally the same as in the LL&M algorithm;
+ * see jfdctint.c for more details.  However, we choose to descale
+ * (right shift) multiplication products as soon as they are formed,
+ * rather than carrying additional fractional bits into subsequent additions.
+ * This compromises accuracy slightly, but it lets us save a few shifts.
+ * More importantly, 16-bit arithmetic is then adequate (for 8-bit samples)
+ * everywhere except in the multiplications proper; this saves a good deal
+ * of work on 16-bit-int machines.
+ *
+ * Again to save a few shifts, the intermediate results between pass 1 and
+ * pass 2 are not upscaled, but are represented only to integral precision.
+ *
+ * A final compromise is to represent the multiplicative constants to only
+ * 8 fractional bits, rather than 13.  This saves some shifting work on some
+ * machines, and may also reduce the cost of multiplication (since there
+ * are fewer one-bits in the constants).
+ */
+
+#define CONST_BITS  8
+
+
+/* Some C compilers fail to reduce "FIX(constant)" at compile time, thus
+ * causing a lot of useless floating-point operations at run time.
+ * To get around this we use the following pre-calculated constants.
+ * If you change CONST_BITS you may want to add appropriate values.
+ * (With a reasonable C compiler, you can just rely on the FIX() macro...)
+ */
+
+#if CONST_BITS == 8
+#define FIX_0_382683433  ((INT32)   98)		/* FIX(0.382683433) */
+#define FIX_0_541196100  ((INT32)  139)		/* FIX(0.541196100) */
+#define FIX_0_707106781  ((INT32)  181)		/* FIX(0.707106781) */
+#define FIX_1_306562965  ((INT32)  334)		/* FIX(1.306562965) */
+#else
+#define FIX_0_382683433  FIX(0.382683433)
+#define FIX_0_541196100  FIX(0.541196100)
+#define FIX_0_707106781  FIX(0.707106781)
+#define FIX_1_306562965  FIX(1.306562965)
+#endif
+
+
+/* We can gain a little more speed, with a further compromise in accuracy,
+ * by omitting the addition in a descaling shift.  This yields an incorrectly
+ * rounded result half the time...
+ */
+
+#ifndef USE_ACCURATE_ROUNDING
+#undef DESCALE
+#define DESCALE(x,n)  RIGHT_SHIFT(x, n)
+#endif
+
+
+/* Multiply a DCTELEM variable by an INT32 constant, and immediately
+ * descale to yield a DCTELEM result.
+ */
+
+#define MULTIPLY(var,const)  ((DCTELEM) DESCALE((var) * (const), CONST_BITS))
+
+
+/*
+ * Perform the forward DCT on one block of samples.
+ */
+
+GLOBAL(void)
+jpeg_fdct_ifast (DCTELEM * data)
+{
+  DCTELEM tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
+  DCTELEM tmp10, tmp11, tmp12, tmp13;
+  DCTELEM z1, z2, z3, z4, z5, z11, z13;
+  DCTELEM *dataptr;
+  int ctr;
+  SHIFT_TEMPS
+
+  /* Pass 1: process rows. */
+
+  dataptr = data;
+  for (ctr = DCTSIZE-1; ctr >= 0; ctr--) {
+    tmp0 = dataptr[0] + dataptr[7];
+    tmp7 = dataptr[0] - dataptr[7];
+    tmp1 = dataptr[1] + dataptr[6];
+    tmp6 = dataptr[1] - dataptr[6];
+    tmp2 = dataptr[2] + dataptr[5];
+    tmp5 = dataptr[2] - dataptr[5];
+    tmp3 = dataptr[3] + dataptr[4];
+    tmp4 = dataptr[3] - dataptr[4];
+    
+    /* Even part */
+    
+    tmp10 = tmp0 + tmp3;	/* phase 2 */
+    tmp13 = tmp0 - tmp3;
+    tmp11 = tmp1 + tmp2;
+    tmp12 = tmp1 - tmp2;
+    
+    dataptr[0] = tmp10 + tmp11; /* phase 3 */
+    dataptr[4] = tmp10 - tmp11;
+    
+    z1 = MULTIPLY(tmp12 + tmp13, FIX_0_707106781); /* c4 */
+    dataptr[2] = tmp13 + z1;	/* phase 5 */
+    dataptr[6] = tmp13 - z1;
+    
+    /* Odd part */
+
+    tmp10 = tmp4 + tmp5;	/* phase 2 */
+    tmp11 = tmp5 + tmp6;
+    tmp12 = tmp6 + tmp7;
+
+    /* The rotator is modified from fig 4-8 to avoid extra negations. */
+    z5 = MULTIPLY(tmp10 - tmp12, FIX_0_382683433); /* c6 */
+    z2 = MULTIPLY(tmp10, FIX_0_541196100) + z5; /* c2-c6 */
+    z4 = MULTIPLY(tmp12, FIX_1_306562965) + z5; /* c2+c6 */
+    z3 = MULTIPLY(tmp11, FIX_0_707106781); /* c4 */
+
+    z11 = tmp7 + z3;		/* phase 5 */
+    z13 = tmp7 - z3;
+
+    dataptr[5] = z13 + z2;	/* phase 6 */
+    dataptr[3] = z13 - z2;
+    dataptr[1] = z11 + z4;
+    dataptr[7] = z11 - z4;
+
+    dataptr += DCTSIZE;		/* advance pointer to next row */
+  }
+
+  /* Pass 2: process columns. */
+
+  dataptr = data;
+  for (ctr = DCTSIZE-1; ctr >= 0; ctr--) {
+    tmp0 = dataptr[DCTSIZE*0] + dataptr[DCTSIZE*7];
+    tmp7 = dataptr[DCTSIZE*0] - dataptr[DCTSIZE*7];
+    tmp1 = dataptr[DCTSIZE*1] + dataptr[DCTSIZE*6];
+    tmp6 = dataptr[DCTSIZE*1] - dataptr[DCTSIZE*6];
+    tmp2 = dataptr[DCTSIZE*2] + dataptr[DCTSIZE*5];
+    tmp5 = dataptr[DCTSIZE*2] - dataptr[DCTSIZE*5];
+    tmp3 = dataptr[DCTSIZE*3] + dataptr[DCTSIZE*4];
+    tmp4 = dataptr[DCTSIZE*3] - dataptr[DCTSIZE*4];
+    
+    /* Even part */
+    
+    tmp10 = tmp0 + tmp3;	/* phase 2 */
+    tmp13 = tmp0 - tmp3;
+    tmp11 = tmp1 + tmp2;
+    tmp12 = tmp1 - tmp2;
+    
+    dataptr[DCTSIZE*0] = tmp10 + tmp11; /* phase 3 */
+    dataptr[DCTSIZE*4] = tmp10 - tmp11;
+    
+    z1 = MULTIPLY(tmp12 + tmp13, FIX_0_707106781); /* c4 */
+    dataptr[DCTSIZE*2] = tmp13 + z1; /* phase 5 */
+    dataptr[DCTSIZE*6] = tmp13 - z1;
+    
+    /* Odd part */
+
+    tmp10 = tmp4 + tmp5;	/* phase 2 */
+    tmp11 = tmp5 + tmp6;
+    tmp12 = tmp6 + tmp7;
+
+    /* The rotator is modified from fig 4-8 to avoid extra negations. */
+    z5 = MULTIPLY(tmp10 - tmp12, FIX_0_382683433); /* c6 */
+    z2 = MULTIPLY(tmp10, FIX_0_541196100) + z5; /* c2-c6 */
+    z4 = MULTIPLY(tmp12, FIX_1_306562965) + z5; /* c2+c6 */
+    z3 = MULTIPLY(tmp11, FIX_0_707106781); /* c4 */
+
+    z11 = tmp7 + z3;		/* phase 5 */
+    z13 = tmp7 - z3;
+
+    dataptr[DCTSIZE*5] = z13 + z2; /* phase 6 */
+    dataptr[DCTSIZE*3] = z13 - z2;
+    dataptr[DCTSIZE*1] = z11 + z4;
+    dataptr[DCTSIZE*7] = z11 - z4;
+
+    dataptr++;			/* advance pointer to next column */
+  }
+}
+
+#endif /* DCT_IFAST_SUPPORTED */
diff --git a/src/libjpeg-turbo/jfdctint.c b/src/libjpeg-turbo/jfdctint.c
new file mode 100644
index 0000000..0a78b64
--- /dev/null
+++ b/src/libjpeg-turbo/jfdctint.c
@@ -0,0 +1,283 @@
+/*
+ * jfdctint.c
+ *
+ * Copyright (C) 1991-1996, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains a slow-but-accurate integer implementation of the
+ * forward DCT (Discrete Cosine Transform).
+ *
+ * A 2-D DCT can be done by 1-D DCT on each row followed by 1-D DCT
+ * on each column.  Direct algorithms are also available, but they are
+ * much more complex and seem not to be any faster when reduced to code.
+ *
+ * This implementation is based on an algorithm described in
+ *   C. Loeffler, A. Ligtenberg and G. Moschytz, "Practical Fast 1-D DCT
+ *   Algorithms with 11 Multiplications", Proc. Int'l. Conf. on Acoustics,
+ *   Speech, and Signal Processing 1989 (ICASSP '89), pp. 988-991.
+ * The primary algorithm described there uses 11 multiplies and 29 adds.
+ * We use their alternate method with 12 multiplies and 32 adds.
+ * The advantage of this method is that no data path contains more than one
+ * multiplication; this allows a very simple and accurate implementation in
+ * scaled fixed-point arithmetic, with a minimal number of shifts.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jdct.h"		/* Private declarations for DCT subsystem */
+
+#ifdef DCT_ISLOW_SUPPORTED
+
+
+/*
+ * This module is specialized to the case DCTSIZE = 8.
+ */
+
+#if DCTSIZE != 8
+  Sorry, this code only copes with 8x8 DCTs. /* deliberate syntax err */
+#endif
+
+
+/*
+ * The poop on this scaling stuff is as follows:
+ *
+ * Each 1-D DCT step produces outputs which are a factor of sqrt(N)
+ * larger than the true DCT outputs.  The final outputs are therefore
+ * a factor of N larger than desired; since N=8 this can be cured by
+ * a simple right shift at the end of the algorithm.  The advantage of
+ * this arrangement is that we save two multiplications per 1-D DCT,
+ * because the y0 and y4 outputs need not be divided by sqrt(N).
+ * In the IJG code, this factor of 8 is removed by the quantization step
+ * (in jcdctmgr.c), NOT in this module.
+ *
+ * We have to do addition and subtraction of the integer inputs, which
+ * is no problem, and multiplication by fractional constants, which is
+ * a problem to do in integer arithmetic.  We multiply all the constants
+ * by CONST_SCALE and convert them to integer constants (thus retaining
+ * CONST_BITS bits of precision in the constants).  After doing a
+ * multiplication we have to divide the product by CONST_SCALE, with proper
+ * rounding, to produce the correct output.  This division can be done
+ * cheaply as a right shift of CONST_BITS bits.  We postpone shifting
+ * as long as possible so that partial sums can be added together with
+ * full fractional precision.
+ *
+ * The outputs of the first pass are scaled up by PASS1_BITS bits so that
+ * they are represented to better-than-integral precision.  These outputs
+ * require BITS_IN_JSAMPLE + PASS1_BITS + 3 bits; this fits in a 16-bit word
+ * with the recommended scaling.  (For 12-bit sample data, the intermediate
+ * array is INT32 anyway.)
+ *
+ * To avoid overflow of the 32-bit intermediate results in pass 2, we must
+ * have BITS_IN_JSAMPLE + CONST_BITS + PASS1_BITS <= 26.  Error analysis
+ * shows that the values given below are the most effective.
+ */
+
+#if BITS_IN_JSAMPLE == 8
+#define CONST_BITS  13
+#define PASS1_BITS  2
+#else
+#define CONST_BITS  13
+#define PASS1_BITS  1		/* lose a little precision to avoid overflow */
+#endif
+
+/* Some C compilers fail to reduce "FIX(constant)" at compile time, thus
+ * causing a lot of useless floating-point operations at run time.
+ * To get around this we use the following pre-calculated constants.
+ * If you change CONST_BITS you may want to add appropriate values.
+ * (With a reasonable C compiler, you can just rely on the FIX() macro...)
+ */
+
+#if CONST_BITS == 13
+#define FIX_0_298631336  ((INT32)  2446)	/* FIX(0.298631336) */
+#define FIX_0_390180644  ((INT32)  3196)	/* FIX(0.390180644) */
+#define FIX_0_541196100  ((INT32)  4433)	/* FIX(0.541196100) */
+#define FIX_0_765366865  ((INT32)  6270)	/* FIX(0.765366865) */
+#define FIX_0_899976223  ((INT32)  7373)	/* FIX(0.899976223) */
+#define FIX_1_175875602  ((INT32)  9633)	/* FIX(1.175875602) */
+#define FIX_1_501321110  ((INT32)  12299)	/* FIX(1.501321110) */
+#define FIX_1_847759065  ((INT32)  15137)	/* FIX(1.847759065) */
+#define FIX_1_961570560  ((INT32)  16069)	/* FIX(1.961570560) */
+#define FIX_2_053119869  ((INT32)  16819)	/* FIX(2.053119869) */
+#define FIX_2_562915447  ((INT32)  20995)	/* FIX(2.562915447) */
+#define FIX_3_072711026  ((INT32)  25172)	/* FIX(3.072711026) */
+#else
+#define FIX_0_298631336  FIX(0.298631336)
+#define FIX_0_390180644  FIX(0.390180644)
+#define FIX_0_541196100  FIX(0.541196100)
+#define FIX_0_765366865  FIX(0.765366865)
+#define FIX_0_899976223  FIX(0.899976223)
+#define FIX_1_175875602  FIX(1.175875602)
+#define FIX_1_501321110  FIX(1.501321110)
+#define FIX_1_847759065  FIX(1.847759065)
+#define FIX_1_961570560  FIX(1.961570560)
+#define FIX_2_053119869  FIX(2.053119869)
+#define FIX_2_562915447  FIX(2.562915447)
+#define FIX_3_072711026  FIX(3.072711026)
+#endif
+
+
+/* Multiply an INT32 variable by an INT32 constant to yield an INT32 result.
+ * For 8-bit samples with the recommended scaling, all the variable
+ * and constant values involved are no more than 16 bits wide, so a
+ * 16x16->32 bit multiply can be used instead of a full 32x32 multiply.
+ * For 12-bit samples, a full 32-bit multiplication will be needed.
+ */
+
+#if BITS_IN_JSAMPLE == 8
+#define MULTIPLY(var,const)  MULTIPLY16C16(var,const)
+#else
+#define MULTIPLY(var,const)  ((var) * (const))
+#endif
+
+
+/*
+ * Perform the forward DCT on one block of samples.
+ */
+
+GLOBAL(void)
+jpeg_fdct_islow (DCTELEM * data)
+{
+  INT32 tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
+  INT32 tmp10, tmp11, tmp12, tmp13;
+  INT32 z1, z2, z3, z4, z5;
+  DCTELEM *dataptr;
+  int ctr;
+  SHIFT_TEMPS
+
+  /* Pass 1: process rows. */
+  /* Note results are scaled up by sqrt(8) compared to a true DCT; */
+  /* furthermore, we scale the results by 2**PASS1_BITS. */
+
+  dataptr = data;
+  for (ctr = DCTSIZE-1; ctr >= 0; ctr--) {
+    tmp0 = dataptr[0] + dataptr[7];
+    tmp7 = dataptr[0] - dataptr[7];
+    tmp1 = dataptr[1] + dataptr[6];
+    tmp6 = dataptr[1] - dataptr[6];
+    tmp2 = dataptr[2] + dataptr[5];
+    tmp5 = dataptr[2] - dataptr[5];
+    tmp3 = dataptr[3] + dataptr[4];
+    tmp4 = dataptr[3] - dataptr[4];
+    
+    /* Even part per LL&M figure 1 --- note that published figure is faulty;
+     * rotator "sqrt(2)*c1" should be "sqrt(2)*c6".
+     */
+    
+    tmp10 = tmp0 + tmp3;
+    tmp13 = tmp0 - tmp3;
+    tmp11 = tmp1 + tmp2;
+    tmp12 = tmp1 - tmp2;
+    
+    dataptr[0] = (DCTELEM) ((tmp10 + tmp11) << PASS1_BITS);
+    dataptr[4] = (DCTELEM) ((tmp10 - tmp11) << PASS1_BITS);
+    
+    z1 = MULTIPLY(tmp12 + tmp13, FIX_0_541196100);
+    dataptr[2] = (DCTELEM) DESCALE(z1 + MULTIPLY(tmp13, FIX_0_765366865),
+				   CONST_BITS-PASS1_BITS);
+    dataptr[6] = (DCTELEM) DESCALE(z1 + MULTIPLY(tmp12, - FIX_1_847759065),
+				   CONST_BITS-PASS1_BITS);
+    
+    /* Odd part per figure 8 --- note paper omits factor of sqrt(2).
+     * cK represents cos(K*pi/16).
+     * i0..i3 in the paper are tmp4..tmp7 here.
+     */
+    
+    z1 = tmp4 + tmp7;
+    z2 = tmp5 + tmp6;
+    z3 = tmp4 + tmp6;
+    z4 = tmp5 + tmp7;
+    z5 = MULTIPLY(z3 + z4, FIX_1_175875602); /* sqrt(2) * c3 */
+    
+    tmp4 = MULTIPLY(tmp4, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */
+    tmp5 = MULTIPLY(tmp5, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */
+    tmp6 = MULTIPLY(tmp6, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */
+    tmp7 = MULTIPLY(tmp7, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */
+    z1 = MULTIPLY(z1, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */
+    z2 = MULTIPLY(z2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */
+    z3 = MULTIPLY(z3, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */
+    z4 = MULTIPLY(z4, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */
+    
+    z3 += z5;
+    z4 += z5;
+    
+    dataptr[7] = (DCTELEM) DESCALE(tmp4 + z1 + z3, CONST_BITS-PASS1_BITS);
+    dataptr[5] = (DCTELEM) DESCALE(tmp5 + z2 + z4, CONST_BITS-PASS1_BITS);
+    dataptr[3] = (DCTELEM) DESCALE(tmp6 + z2 + z3, CONST_BITS-PASS1_BITS);
+    dataptr[1] = (DCTELEM) DESCALE(tmp7 + z1 + z4, CONST_BITS-PASS1_BITS);
+    
+    dataptr += DCTSIZE;		/* advance pointer to next row */
+  }
+
+  /* Pass 2: process columns.
+   * We remove the PASS1_BITS scaling, but leave the results scaled up
+   * by an overall factor of 8.
+   */
+
+  dataptr = data;
+  for (ctr = DCTSIZE-1; ctr >= 0; ctr--) {
+    tmp0 = dataptr[DCTSIZE*0] + dataptr[DCTSIZE*7];
+    tmp7 = dataptr[DCTSIZE*0] - dataptr[DCTSIZE*7];
+    tmp1 = dataptr[DCTSIZE*1] + dataptr[DCTSIZE*6];
+    tmp6 = dataptr[DCTSIZE*1] - dataptr[DCTSIZE*6];
+    tmp2 = dataptr[DCTSIZE*2] + dataptr[DCTSIZE*5];
+    tmp5 = dataptr[DCTSIZE*2] - dataptr[DCTSIZE*5];
+    tmp3 = dataptr[DCTSIZE*3] + dataptr[DCTSIZE*4];
+    tmp4 = dataptr[DCTSIZE*3] - dataptr[DCTSIZE*4];
+    
+    /* Even part per LL&M figure 1 --- note that published figure is faulty;
+     * rotator "sqrt(2)*c1" should be "sqrt(2)*c6".
+     */
+    
+    tmp10 = tmp0 + tmp3;
+    tmp13 = tmp0 - tmp3;
+    tmp11 = tmp1 + tmp2;
+    tmp12 = tmp1 - tmp2;
+    
+    dataptr[DCTSIZE*0] = (DCTELEM) DESCALE(tmp10 + tmp11, PASS1_BITS);
+    dataptr[DCTSIZE*4] = (DCTELEM) DESCALE(tmp10 - tmp11, PASS1_BITS);
+    
+    z1 = MULTIPLY(tmp12 + tmp13, FIX_0_541196100);
+    dataptr[DCTSIZE*2] = (DCTELEM) DESCALE(z1 + MULTIPLY(tmp13, FIX_0_765366865),
+					   CONST_BITS+PASS1_BITS);
+    dataptr[DCTSIZE*6] = (DCTELEM) DESCALE(z1 + MULTIPLY(tmp12, - FIX_1_847759065),
+					   CONST_BITS+PASS1_BITS);
+    
+    /* Odd part per figure 8 --- note paper omits factor of sqrt(2).
+     * cK represents cos(K*pi/16).
+     * i0..i3 in the paper are tmp4..tmp7 here.
+     */
+    
+    z1 = tmp4 + tmp7;
+    z2 = tmp5 + tmp6;
+    z3 = tmp4 + tmp6;
+    z4 = tmp5 + tmp7;
+    z5 = MULTIPLY(z3 + z4, FIX_1_175875602); /* sqrt(2) * c3 */
+    
+    tmp4 = MULTIPLY(tmp4, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */
+    tmp5 = MULTIPLY(tmp5, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */
+    tmp6 = MULTIPLY(tmp6, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */
+    tmp7 = MULTIPLY(tmp7, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */
+    z1 = MULTIPLY(z1, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */
+    z2 = MULTIPLY(z2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */
+    z3 = MULTIPLY(z3, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */
+    z4 = MULTIPLY(z4, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */
+    
+    z3 += z5;
+    z4 += z5;
+    
+    dataptr[DCTSIZE*7] = (DCTELEM) DESCALE(tmp4 + z1 + z3,
+					   CONST_BITS+PASS1_BITS);
+    dataptr[DCTSIZE*5] = (DCTELEM) DESCALE(tmp5 + z2 + z4,
+					   CONST_BITS+PASS1_BITS);
+    dataptr[DCTSIZE*3] = (DCTELEM) DESCALE(tmp6 + z2 + z3,
+					   CONST_BITS+PASS1_BITS);
+    dataptr[DCTSIZE*1] = (DCTELEM) DESCALE(tmp7 + z1 + z4,
+					   CONST_BITS+PASS1_BITS);
+    
+    dataptr++;			/* advance pointer to next column */
+  }
+}
+
+#endif /* DCT_ISLOW_SUPPORTED */
diff --git a/src/libjpeg-turbo/jidctflt.c b/src/libjpeg-turbo/jidctflt.c
new file mode 100644
index 0000000..0188ce3
--- /dev/null
+++ b/src/libjpeg-turbo/jidctflt.c
@@ -0,0 +1,242 @@
+/*
+ * jidctflt.c
+ *
+ * Copyright (C) 1994-1998, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains a floating-point implementation of the
+ * inverse DCT (Discrete Cosine Transform).  In the IJG code, this routine
+ * must also perform dequantization of the input coefficients.
+ *
+ * This implementation should be more accurate than either of the integer
+ * IDCT implementations.  However, it may not give the same results on all
+ * machines because of differences in roundoff behavior.  Speed will depend
+ * on the hardware's floating point capacity.
+ *
+ * A 2-D IDCT can be done by 1-D IDCT on each column followed by 1-D IDCT
+ * on each row (or vice versa, but it's more convenient to emit a row at
+ * a time).  Direct algorithms are also available, but they are much more
+ * complex and seem not to be any faster when reduced to code.
+ *
+ * This implementation is based on Arai, Agui, and Nakajima's algorithm for
+ * scaled DCT.  Their original paper (Trans. IEICE E-71(11):1095) is in
+ * Japanese, but the algorithm is described in the Pennebaker & Mitchell
+ * JPEG textbook (see REFERENCES section in file README).  The following code
+ * is based directly on figure 4-8 in P&M.
+ * While an 8-point DCT cannot be done in less than 11 multiplies, it is
+ * possible to arrange the computation so that many of the multiplies are
+ * simple scalings of the final outputs.  These multiplies can then be
+ * folded into the multiplications or divisions by the JPEG quantization
+ * table entries.  The AA&N method leaves only 5 multiplies and 29 adds
+ * to be done in the DCT itself.
+ * The primary disadvantage of this method is that with a fixed-point
+ * implementation, accuracy is lost due to imprecise representation of the
+ * scaled quantization values.  However, that problem does not arise if
+ * we use floating point arithmetic.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jdct.h"		/* Private declarations for DCT subsystem */
+
+#ifdef DCT_FLOAT_SUPPORTED
+
+
+/*
+ * This module is specialized to the case DCTSIZE = 8.
+ */
+
+#if DCTSIZE != 8
+  Sorry, this code only copes with 8x8 DCTs. /* deliberate syntax err */
+#endif
+
+
+/* Dequantize a coefficient by multiplying it by the multiplier-table
+ * entry; produce a float result.
+ */
+
+#define DEQUANTIZE(coef,quantval)  (((FAST_FLOAT) (coef)) * (quantval))
+
+
+/*
+ * Perform dequantization and inverse DCT on one block of coefficients.
+ */
+
+GLOBAL(void)
+jpeg_idct_float (j_decompress_ptr cinfo, jpeg_component_info * compptr,
+		 JCOEFPTR coef_block,
+		 JSAMPARRAY output_buf, JDIMENSION output_col)
+{
+  FAST_FLOAT tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
+  FAST_FLOAT tmp10, tmp11, tmp12, tmp13;
+  FAST_FLOAT z5, z10, z11, z12, z13;
+  JCOEFPTR inptr;
+  FLOAT_MULT_TYPE * quantptr;
+  FAST_FLOAT * wsptr;
+  JSAMPROW outptr;
+  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
+  int ctr;
+  FAST_FLOAT workspace[DCTSIZE2]; /* buffers data between passes */
+  SHIFT_TEMPS
+
+  /* Pass 1: process columns from input, store into work array. */
+
+  inptr = coef_block;
+  quantptr = (FLOAT_MULT_TYPE *) compptr->dct_table;
+  wsptr = workspace;
+  for (ctr = DCTSIZE; ctr > 0; ctr--) {
+    /* Due to quantization, we will usually find that many of the input
+     * coefficients are zero, especially the AC terms.  We can exploit this
+     * by short-circuiting the IDCT calculation for any column in which all
+     * the AC terms are zero.  In that case each output is equal to the
+     * DC coefficient (with scale factor as needed).
+     * With typical images and quantization tables, half or more of the
+     * column DCT calculations can be simplified this way.
+     */
+    
+    if (inptr[DCTSIZE*1] == 0 && inptr[DCTSIZE*2] == 0 &&
+	inptr[DCTSIZE*3] == 0 && inptr[DCTSIZE*4] == 0 &&
+	inptr[DCTSIZE*5] == 0 && inptr[DCTSIZE*6] == 0 &&
+	inptr[DCTSIZE*7] == 0) {
+      /* AC terms all zero */
+      FAST_FLOAT dcval = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
+      
+      wsptr[DCTSIZE*0] = dcval;
+      wsptr[DCTSIZE*1] = dcval;
+      wsptr[DCTSIZE*2] = dcval;
+      wsptr[DCTSIZE*3] = dcval;
+      wsptr[DCTSIZE*4] = dcval;
+      wsptr[DCTSIZE*5] = dcval;
+      wsptr[DCTSIZE*6] = dcval;
+      wsptr[DCTSIZE*7] = dcval;
+      
+      inptr++;			/* advance pointers to next column */
+      quantptr++;
+      wsptr++;
+      continue;
+    }
+    
+    /* Even part */
+
+    tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
+    tmp1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
+    tmp2 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]);
+    tmp3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]);
+
+    tmp10 = tmp0 + tmp2;	/* phase 3 */
+    tmp11 = tmp0 - tmp2;
+
+    tmp13 = tmp1 + tmp3;	/* phases 5-3 */
+    tmp12 = (tmp1 - tmp3) * ((FAST_FLOAT) 1.414213562) - tmp13; /* 2*c4 */
+
+    tmp0 = tmp10 + tmp13;	/* phase 2 */
+    tmp3 = tmp10 - tmp13;
+    tmp1 = tmp11 + tmp12;
+    tmp2 = tmp11 - tmp12;
+    
+    /* Odd part */
+
+    tmp4 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
+    tmp5 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
+    tmp6 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
+    tmp7 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]);
+
+    z13 = tmp6 + tmp5;		/* phase 6 */
+    z10 = tmp6 - tmp5;
+    z11 = tmp4 + tmp7;
+    z12 = tmp4 - tmp7;
+
+    tmp7 = z11 + z13;		/* phase 5 */
+    tmp11 = (z11 - z13) * ((FAST_FLOAT) 1.414213562); /* 2*c4 */
+
+    z5 = (z10 + z12) * ((FAST_FLOAT) 1.847759065); /* 2*c2 */
+    tmp10 = ((FAST_FLOAT) 1.082392200) * z12 - z5; /* 2*(c2-c6) */
+    tmp12 = ((FAST_FLOAT) -2.613125930) * z10 + z5; /* -2*(c2+c6) */
+
+    tmp6 = tmp12 - tmp7;	/* phase 2 */
+    tmp5 = tmp11 - tmp6;
+    tmp4 = tmp10 + tmp5;
+
+    wsptr[DCTSIZE*0] = tmp0 + tmp7;
+    wsptr[DCTSIZE*7] = tmp0 - tmp7;
+    wsptr[DCTSIZE*1] = tmp1 + tmp6;
+    wsptr[DCTSIZE*6] = tmp1 - tmp6;
+    wsptr[DCTSIZE*2] = tmp2 + tmp5;
+    wsptr[DCTSIZE*5] = tmp2 - tmp5;
+    wsptr[DCTSIZE*4] = tmp3 + tmp4;
+    wsptr[DCTSIZE*3] = tmp3 - tmp4;
+
+    inptr++;			/* advance pointers to next column */
+    quantptr++;
+    wsptr++;
+  }
+  
+  /* Pass 2: process rows from work array, store into output array. */
+  /* Note that we must descale the results by a factor of 8 == 2**3. */
+
+  wsptr = workspace;
+  for (ctr = 0; ctr < DCTSIZE; ctr++) {
+    outptr = output_buf[ctr] + output_col;
+    /* Rows of zeroes can be exploited in the same way as we did with columns.
+     * However, the column calculation has created many nonzero AC terms, so
+     * the simplification applies less often (typically 5% to 10% of the time).
+     * And testing floats for zero is relatively expensive, so we don't bother.
+     */
+    
+    /* Even part */
+
+    tmp10 = wsptr[0] + wsptr[4];
+    tmp11 = wsptr[0] - wsptr[4];
+
+    tmp13 = wsptr[2] + wsptr[6];
+    tmp12 = (wsptr[2] - wsptr[6]) * ((FAST_FLOAT) 1.414213562) - tmp13;
+
+    tmp0 = tmp10 + tmp13;
+    tmp3 = tmp10 - tmp13;
+    tmp1 = tmp11 + tmp12;
+    tmp2 = tmp11 - tmp12;
+
+    /* Odd part */
+
+    z13 = wsptr[5] + wsptr[3];
+    z10 = wsptr[5] - wsptr[3];
+    z11 = wsptr[1] + wsptr[7];
+    z12 = wsptr[1] - wsptr[7];
+
+    tmp7 = z11 + z13;
+    tmp11 = (z11 - z13) * ((FAST_FLOAT) 1.414213562);
+
+    z5 = (z10 + z12) * ((FAST_FLOAT) 1.847759065); /* 2*c2 */
+    tmp10 = ((FAST_FLOAT) 1.082392200) * z12 - z5; /* 2*(c2-c6) */
+    tmp12 = ((FAST_FLOAT) -2.613125930) * z10 + z5; /* -2*(c2+c6) */
+
+    tmp6 = tmp12 - tmp7;
+    tmp5 = tmp11 - tmp6;
+    tmp4 = tmp10 + tmp5;
+
+    /* Final output stage: scale down by a factor of 8 and range-limit */
+
+    outptr[0] = range_limit[(int) DESCALE((INT32) (tmp0 + tmp7), 3)
+			    & RANGE_MASK];
+    outptr[7] = range_limit[(int) DESCALE((INT32) (tmp0 - tmp7), 3)
+			    & RANGE_MASK];
+    outptr[1] = range_limit[(int) DESCALE((INT32) (tmp1 + tmp6), 3)
+			    & RANGE_MASK];
+    outptr[6] = range_limit[(int) DESCALE((INT32) (tmp1 - tmp6), 3)
+			    & RANGE_MASK];
+    outptr[2] = range_limit[(int) DESCALE((INT32) (tmp2 + tmp5), 3)
+			    & RANGE_MASK];
+    outptr[5] = range_limit[(int) DESCALE((INT32) (tmp2 - tmp5), 3)
+			    & RANGE_MASK];
+    outptr[4] = range_limit[(int) DESCALE((INT32) (tmp3 + tmp4), 3)
+			    & RANGE_MASK];
+    outptr[3] = range_limit[(int) DESCALE((INT32) (tmp3 - tmp4), 3)
+			    & RANGE_MASK];
+    
+    wsptr += DCTSIZE;		/* advance pointer to next row */
+  }
+}
+
+#endif /* DCT_FLOAT_SUPPORTED */
diff --git a/src/libjpeg-turbo/jidctfst.c b/src/libjpeg-turbo/jidctfst.c
new file mode 100644
index 0000000..dba4216
--- /dev/null
+++ b/src/libjpeg-turbo/jidctfst.c
@@ -0,0 +1,368 @@
+/*
+ * jidctfst.c
+ *
+ * Copyright (C) 1994-1998, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains a fast, not so accurate integer implementation of the
+ * inverse DCT (Discrete Cosine Transform).  In the IJG code, this routine
+ * must also perform dequantization of the input coefficients.
+ *
+ * A 2-D IDCT can be done by 1-D IDCT on each column followed by 1-D IDCT
+ * on each row (or vice versa, but it's more convenient to emit a row at
+ * a time).  Direct algorithms are also available, but they are much more
+ * complex and seem not to be any faster when reduced to code.
+ *
+ * This implementation is based on Arai, Agui, and Nakajima's algorithm for
+ * scaled DCT.  Their original paper (Trans. IEICE E-71(11):1095) is in
+ * Japanese, but the algorithm is described in the Pennebaker & Mitchell
+ * JPEG textbook (see REFERENCES section in file README).  The following code
+ * is based directly on figure 4-8 in P&M.
+ * While an 8-point DCT cannot be done in less than 11 multiplies, it is
+ * possible to arrange the computation so that many of the multiplies are
+ * simple scalings of the final outputs.  These multiplies can then be
+ * folded into the multiplications or divisions by the JPEG quantization
+ * table entries.  The AA&N method leaves only 5 multiplies and 29 adds
+ * to be done in the DCT itself.
+ * The primary disadvantage of this method is that with fixed-point math,
+ * accuracy is lost due to imprecise representation of the scaled
+ * quantization values.  The smaller the quantization table entry, the less
+ * precise the scaled value, so this implementation does worse with high-
+ * quality-setting files than with low-quality ones.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jdct.h"		/* Private declarations for DCT subsystem */
+
+#ifdef DCT_IFAST_SUPPORTED
+
+
+/*
+ * This module is specialized to the case DCTSIZE = 8.
+ */
+
+#if DCTSIZE != 8
+  Sorry, this code only copes with 8x8 DCTs. /* deliberate syntax err */
+#endif
+
+
+/* Scaling decisions are generally the same as in the LL&M algorithm;
+ * see jidctint.c for more details.  However, we choose to descale
+ * (right shift) multiplication products as soon as they are formed,
+ * rather than carrying additional fractional bits into subsequent additions.
+ * This compromises accuracy slightly, but it lets us save a few shifts.
+ * More importantly, 16-bit arithmetic is then adequate (for 8-bit samples)
+ * everywhere except in the multiplications proper; this saves a good deal
+ * of work on 16-bit-int machines.
+ *
+ * The dequantized coefficients are not integers because the AA&N scaling
+ * factors have been incorporated.  We represent them scaled up by PASS1_BITS,
+ * so that the first and second IDCT rounds have the same input scaling.
+ * For 8-bit JSAMPLEs, we choose IFAST_SCALE_BITS = PASS1_BITS so as to
+ * avoid a descaling shift; this compromises accuracy rather drastically
+ * for small quantization table entries, but it saves a lot of shifts.
+ * For 12-bit JSAMPLEs, there's no hope of using 16x16 multiplies anyway,
+ * so we use a much larger scaling factor to preserve accuracy.
+ *
+ * A final compromise is to represent the multiplicative constants to only
+ * 8 fractional bits, rather than 13.  This saves some shifting work on some
+ * machines, and may also reduce the cost of multiplication (since there
+ * are fewer one-bits in the constants).
+ */
+
+#if BITS_IN_JSAMPLE == 8
+#define CONST_BITS  8
+#define PASS1_BITS  2
+#else
+#define CONST_BITS  8
+#define PASS1_BITS  1		/* lose a little precision to avoid overflow */
+#endif
+
+/* Some C compilers fail to reduce "FIX(constant)" at compile time, thus
+ * causing a lot of useless floating-point operations at run time.
+ * To get around this we use the following pre-calculated constants.
+ * If you change CONST_BITS you may want to add appropriate values.
+ * (With a reasonable C compiler, you can just rely on the FIX() macro...)
+ */
+
+#if CONST_BITS == 8
+#define FIX_1_082392200  ((INT32)  277)		/* FIX(1.082392200) */
+#define FIX_1_414213562  ((INT32)  362)		/* FIX(1.414213562) */
+#define FIX_1_847759065  ((INT32)  473)		/* FIX(1.847759065) */
+#define FIX_2_613125930  ((INT32)  669)		/* FIX(2.613125930) */
+#else
+#define FIX_1_082392200  FIX(1.082392200)
+#define FIX_1_414213562  FIX(1.414213562)
+#define FIX_1_847759065  FIX(1.847759065)
+#define FIX_2_613125930  FIX(2.613125930)
+#endif
+
+
+/* We can gain a little more speed, with a further compromise in accuracy,
+ * by omitting the addition in a descaling shift.  This yields an incorrectly
+ * rounded result half the time...
+ */
+
+#ifndef USE_ACCURATE_ROUNDING
+#undef DESCALE
+#define DESCALE(x,n)  RIGHT_SHIFT(x, n)
+#endif
+
+
+/* Multiply a DCTELEM variable by an INT32 constant, and immediately
+ * descale to yield a DCTELEM result.
+ */
+
+#define MULTIPLY(var,const)  ((DCTELEM) DESCALE((var) * (const), CONST_BITS))
+
+
+/* Dequantize a coefficient by multiplying it by the multiplier-table
+ * entry; produce a DCTELEM result.  For 8-bit data a 16x16->16
+ * multiplication will do.  For 12-bit data, the multiplier table is
+ * declared INT32, so a 32-bit multiply will be used.
+ */
+
+#if BITS_IN_JSAMPLE == 8
+#define DEQUANTIZE(coef,quantval)  (((IFAST_MULT_TYPE) (coef)) * (quantval))
+#else
+#define DEQUANTIZE(coef,quantval)  \
+	DESCALE((coef)*(quantval), IFAST_SCALE_BITS-PASS1_BITS)
+#endif
+
+
+/* Like DESCALE, but applies to a DCTELEM and produces an int.
+ * We assume that int right shift is unsigned if INT32 right shift is.
+ */
+
+#ifdef RIGHT_SHIFT_IS_UNSIGNED
+#define ISHIFT_TEMPS	DCTELEM ishift_temp;
+#if BITS_IN_JSAMPLE == 8
+#define DCTELEMBITS  16		/* DCTELEM may be 16 or 32 bits */
+#else
+#define DCTELEMBITS  32		/* DCTELEM must be 32 bits */
+#endif
+#define IRIGHT_SHIFT(x,shft)  \
+    ((ishift_temp = (x)) < 0 ? \
+     (ishift_temp >> (shft)) | ((~((DCTELEM) 0)) << (DCTELEMBITS-(shft))) : \
+     (ishift_temp >> (shft)))
+#else
+#define ISHIFT_TEMPS
+#define IRIGHT_SHIFT(x,shft)	((x) >> (shft))
+#endif
+
+#ifdef USE_ACCURATE_ROUNDING
+#define IDESCALE(x,n)  ((int) IRIGHT_SHIFT((x) + (1 << ((n)-1)), n))
+#else
+#define IDESCALE(x,n)  ((int) IRIGHT_SHIFT(x, n))
+#endif
+
+
+/*
+ * Perform dequantization and inverse DCT on one block of coefficients.
+ */
+
+GLOBAL(void)
+jpeg_idct_ifast (j_decompress_ptr cinfo, jpeg_component_info * compptr,
+		 JCOEFPTR coef_block,
+		 JSAMPARRAY output_buf, JDIMENSION output_col)
+{
+  DCTELEM tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
+  DCTELEM tmp10, tmp11, tmp12, tmp13;
+  DCTELEM z5, z10, z11, z12, z13;
+  JCOEFPTR inptr;
+  IFAST_MULT_TYPE * quantptr;
+  int * wsptr;
+  JSAMPROW outptr;
+  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
+  int ctr;
+  int workspace[DCTSIZE2];	/* buffers data between passes */
+  SHIFT_TEMPS			/* for DESCALE */
+  ISHIFT_TEMPS			/* for IDESCALE */
+
+  /* Pass 1: process columns from input, store into work array. */
+
+  inptr = coef_block;
+  quantptr = (IFAST_MULT_TYPE *) compptr->dct_table;
+  wsptr = workspace;
+  for (ctr = DCTSIZE; ctr > 0; ctr--) {
+    /* Due to quantization, we will usually find that many of the input
+     * coefficients are zero, especially the AC terms.  We can exploit this
+     * by short-circuiting the IDCT calculation for any column in which all
+     * the AC terms are zero.  In that case each output is equal to the
+     * DC coefficient (with scale factor as needed).
+     * With typical images and quantization tables, half or more of the
+     * column DCT calculations can be simplified this way.
+     */
+    
+    if (inptr[DCTSIZE*1] == 0 && inptr[DCTSIZE*2] == 0 &&
+	inptr[DCTSIZE*3] == 0 && inptr[DCTSIZE*4] == 0 &&
+	inptr[DCTSIZE*5] == 0 && inptr[DCTSIZE*6] == 0 &&
+	inptr[DCTSIZE*7] == 0) {
+      /* AC terms all zero */
+      int dcval = (int) DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
+
+      wsptr[DCTSIZE*0] = dcval;
+      wsptr[DCTSIZE*1] = dcval;
+      wsptr[DCTSIZE*2] = dcval;
+      wsptr[DCTSIZE*3] = dcval;
+      wsptr[DCTSIZE*4] = dcval;
+      wsptr[DCTSIZE*5] = dcval;
+      wsptr[DCTSIZE*6] = dcval;
+      wsptr[DCTSIZE*7] = dcval;
+      
+      inptr++;			/* advance pointers to next column */
+      quantptr++;
+      wsptr++;
+      continue;
+    }
+    
+    /* Even part */
+
+    tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
+    tmp1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
+    tmp2 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]);
+    tmp3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]);
+
+    tmp10 = tmp0 + tmp2;	/* phase 3 */
+    tmp11 = tmp0 - tmp2;
+
+    tmp13 = tmp1 + tmp3;	/* phases 5-3 */
+    tmp12 = MULTIPLY(tmp1 - tmp3, FIX_1_414213562) - tmp13; /* 2*c4 */
+
+    tmp0 = tmp10 + tmp13;	/* phase 2 */
+    tmp3 = tmp10 - tmp13;
+    tmp1 = tmp11 + tmp12;
+    tmp2 = tmp11 - tmp12;
+    
+    /* Odd part */
+
+    tmp4 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
+    tmp5 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
+    tmp6 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
+    tmp7 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]);
+
+    z13 = tmp6 + tmp5;		/* phase 6 */
+    z10 = tmp6 - tmp5;
+    z11 = tmp4 + tmp7;
+    z12 = tmp4 - tmp7;
+
+    tmp7 = z11 + z13;		/* phase 5 */
+    tmp11 = MULTIPLY(z11 - z13, FIX_1_414213562); /* 2*c4 */
+
+    z5 = MULTIPLY(z10 + z12, FIX_1_847759065); /* 2*c2 */
+    tmp10 = MULTIPLY(z12, FIX_1_082392200) - z5; /* 2*(c2-c6) */
+    tmp12 = MULTIPLY(z10, - FIX_2_613125930) + z5; /* -2*(c2+c6) */
+
+    tmp6 = tmp12 - tmp7;	/* phase 2 */
+    tmp5 = tmp11 - tmp6;
+    tmp4 = tmp10 + tmp5;
+
+    wsptr[DCTSIZE*0] = (int) (tmp0 + tmp7);
+    wsptr[DCTSIZE*7] = (int) (tmp0 - tmp7);
+    wsptr[DCTSIZE*1] = (int) (tmp1 + tmp6);
+    wsptr[DCTSIZE*6] = (int) (tmp1 - tmp6);
+    wsptr[DCTSIZE*2] = (int) (tmp2 + tmp5);
+    wsptr[DCTSIZE*5] = (int) (tmp2 - tmp5);
+    wsptr[DCTSIZE*4] = (int) (tmp3 + tmp4);
+    wsptr[DCTSIZE*3] = (int) (tmp3 - tmp4);
+
+    inptr++;			/* advance pointers to next column */
+    quantptr++;
+    wsptr++;
+  }
+  
+  /* Pass 2: process rows from work array, store into output array. */
+  /* Note that we must descale the results by a factor of 8 == 2**3, */
+  /* and also undo the PASS1_BITS scaling. */
+
+  wsptr = workspace;
+  for (ctr = 0; ctr < DCTSIZE; ctr++) {
+    outptr = output_buf[ctr] + output_col;
+    /* Rows of zeroes can be exploited in the same way as we did with columns.
+     * However, the column calculation has created many nonzero AC terms, so
+     * the simplification applies less often (typically 5% to 10% of the time).
+     * On machines with very fast multiplication, it's possible that the
+     * test takes more time than it's worth.  In that case this section
+     * may be commented out.
+     */
+    
+#ifndef NO_ZERO_ROW_TEST
+    if (wsptr[1] == 0 && wsptr[2] == 0 && wsptr[3] == 0 && wsptr[4] == 0 &&
+	wsptr[5] == 0 && wsptr[6] == 0 && wsptr[7] == 0) {
+      /* AC terms all zero */
+      JSAMPLE dcval = range_limit[IDESCALE(wsptr[0], PASS1_BITS+3)
+				  & RANGE_MASK];
+      
+      outptr[0] = dcval;
+      outptr[1] = dcval;
+      outptr[2] = dcval;
+      outptr[3] = dcval;
+      outptr[4] = dcval;
+      outptr[5] = dcval;
+      outptr[6] = dcval;
+      outptr[7] = dcval;
+
+      wsptr += DCTSIZE;		/* advance pointer to next row */
+      continue;
+    }
+#endif
+    
+    /* Even part */
+
+    tmp10 = ((DCTELEM) wsptr[0] + (DCTELEM) wsptr[4]);
+    tmp11 = ((DCTELEM) wsptr[0] - (DCTELEM) wsptr[4]);
+
+    tmp13 = ((DCTELEM) wsptr[2] + (DCTELEM) wsptr[6]);
+    tmp12 = MULTIPLY((DCTELEM) wsptr[2] - (DCTELEM) wsptr[6], FIX_1_414213562)
+	    - tmp13;
+
+    tmp0 = tmp10 + tmp13;
+    tmp3 = tmp10 - tmp13;
+    tmp1 = tmp11 + tmp12;
+    tmp2 = tmp11 - tmp12;
+
+    /* Odd part */
+
+    z13 = (DCTELEM) wsptr[5] + (DCTELEM) wsptr[3];
+    z10 = (DCTELEM) wsptr[5] - (DCTELEM) wsptr[3];
+    z11 = (DCTELEM) wsptr[1] + (DCTELEM) wsptr[7];
+    z12 = (DCTELEM) wsptr[1] - (DCTELEM) wsptr[7];
+
+    tmp7 = z11 + z13;		/* phase 5 */
+    tmp11 = MULTIPLY(z11 - z13, FIX_1_414213562); /* 2*c4 */
+
+    z5 = MULTIPLY(z10 + z12, FIX_1_847759065); /* 2*c2 */
+    tmp10 = MULTIPLY(z12, FIX_1_082392200) - z5; /* 2*(c2-c6) */
+    tmp12 = MULTIPLY(z10, - FIX_2_613125930) + z5; /* -2*(c2+c6) */
+
+    tmp6 = tmp12 - tmp7;	/* phase 2 */
+    tmp5 = tmp11 - tmp6;
+    tmp4 = tmp10 + tmp5;
+
+    /* Final output stage: scale down by a factor of 8 and range-limit */
+
+    outptr[0] = range_limit[IDESCALE(tmp0 + tmp7, PASS1_BITS+3)
+			    & RANGE_MASK];
+    outptr[7] = range_limit[IDESCALE(tmp0 - tmp7, PASS1_BITS+3)
+			    & RANGE_MASK];
+    outptr[1] = range_limit[IDESCALE(tmp1 + tmp6, PASS1_BITS+3)
+			    & RANGE_MASK];
+    outptr[6] = range_limit[IDESCALE(tmp1 - tmp6, PASS1_BITS+3)
+			    & RANGE_MASK];
+    outptr[2] = range_limit[IDESCALE(tmp2 + tmp5, PASS1_BITS+3)
+			    & RANGE_MASK];
+    outptr[5] = range_limit[IDESCALE(tmp2 - tmp5, PASS1_BITS+3)
+			    & RANGE_MASK];
+    outptr[4] = range_limit[IDESCALE(tmp3 + tmp4, PASS1_BITS+3)
+			    & RANGE_MASK];
+    outptr[3] = range_limit[IDESCALE(tmp3 - tmp4, PASS1_BITS+3)
+			    & RANGE_MASK];
+
+    wsptr += DCTSIZE;		/* advance pointer to next row */
+  }
+}
+
+#endif /* DCT_IFAST_SUPPORTED */
diff --git a/src/libjpeg-turbo/jidctint.c b/src/libjpeg-turbo/jidctint.c
new file mode 100644
index 0000000..a72b320
--- /dev/null
+++ b/src/libjpeg-turbo/jidctint.c
@@ -0,0 +1,389 @@
+/*
+ * jidctint.c
+ *
+ * Copyright (C) 1991-1998, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains a slow-but-accurate integer implementation of the
+ * inverse DCT (Discrete Cosine Transform).  In the IJG code, this routine
+ * must also perform dequantization of the input coefficients.
+ *
+ * A 2-D IDCT can be done by 1-D IDCT on each column followed by 1-D IDCT
+ * on each row (or vice versa, but it's more convenient to emit a row at
+ * a time).  Direct algorithms are also available, but they are much more
+ * complex and seem not to be any faster when reduced to code.
+ *
+ * This implementation is based on an algorithm described in
+ *   C. Loeffler, A. Ligtenberg and G. Moschytz, "Practical Fast 1-D DCT
+ *   Algorithms with 11 Multiplications", Proc. Int'l. Conf. on Acoustics,
+ *   Speech, and Signal Processing 1989 (ICASSP '89), pp. 988-991.
+ * The primary algorithm described there uses 11 multiplies and 29 adds.
+ * We use their alternate method with 12 multiplies and 32 adds.
+ * The advantage of this method is that no data path contains more than one
+ * multiplication; this allows a very simple and accurate implementation in
+ * scaled fixed-point arithmetic, with a minimal number of shifts.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jdct.h"		/* Private declarations for DCT subsystem */
+
+#ifdef DCT_ISLOW_SUPPORTED
+
+
+/*
+ * This module is specialized to the case DCTSIZE = 8.
+ */
+
+#if DCTSIZE != 8
+  Sorry, this code only copes with 8x8 DCTs. /* deliberate syntax err */
+#endif
+
+
+/*
+ * The poop on this scaling stuff is as follows:
+ *
+ * Each 1-D IDCT step produces outputs which are a factor of sqrt(N)
+ * larger than the true IDCT outputs.  The final outputs are therefore
+ * a factor of N larger than desired; since N=8 this can be cured by
+ * a simple right shift at the end of the algorithm.  The advantage of
+ * this arrangement is that we save two multiplications per 1-D IDCT,
+ * because the y0 and y4 inputs need not be divided by sqrt(N).
+ *
+ * We have to do addition and subtraction of the integer inputs, which
+ * is no problem, and multiplication by fractional constants, which is
+ * a problem to do in integer arithmetic.  We multiply all the constants
+ * by CONST_SCALE and convert them to integer constants (thus retaining
+ * CONST_BITS bits of precision in the constants).  After doing a
+ * multiplication we have to divide the product by CONST_SCALE, with proper
+ * rounding, to produce the correct output.  This division can be done
+ * cheaply as a right shift of CONST_BITS bits.  We postpone shifting
+ * as long as possible so that partial sums can be added together with
+ * full fractional precision.
+ *
+ * The outputs of the first pass are scaled up by PASS1_BITS bits so that
+ * they are represented to better-than-integral precision.  These outputs
+ * require BITS_IN_JSAMPLE + PASS1_BITS + 3 bits; this fits in a 16-bit word
+ * with the recommended scaling.  (To scale up 12-bit sample data further, an
+ * intermediate INT32 array would be needed.)
+ *
+ * To avoid overflow of the 32-bit intermediate results in pass 2, we must
+ * have BITS_IN_JSAMPLE + CONST_BITS + PASS1_BITS <= 26.  Error analysis
+ * shows that the values given below are the most effective.
+ */
+
+#if BITS_IN_JSAMPLE == 8
+#define CONST_BITS  13
+#define PASS1_BITS  2
+#else
+#define CONST_BITS  13
+#define PASS1_BITS  1		/* lose a little precision to avoid overflow */
+#endif
+
+/* Some C compilers fail to reduce "FIX(constant)" at compile time, thus
+ * causing a lot of useless floating-point operations at run time.
+ * To get around this we use the following pre-calculated constants.
+ * If you change CONST_BITS you may want to add appropriate values.
+ * (With a reasonable C compiler, you can just rely on the FIX() macro...)
+ */
+
+#if CONST_BITS == 13
+#define FIX_0_298631336  ((INT32)  2446)	/* FIX(0.298631336) */
+#define FIX_0_390180644  ((INT32)  3196)	/* FIX(0.390180644) */
+#define FIX_0_541196100  ((INT32)  4433)	/* FIX(0.541196100) */
+#define FIX_0_765366865  ((INT32)  6270)	/* FIX(0.765366865) */
+#define FIX_0_899976223  ((INT32)  7373)	/* FIX(0.899976223) */
+#define FIX_1_175875602  ((INT32)  9633)	/* FIX(1.175875602) */
+#define FIX_1_501321110  ((INT32)  12299)	/* FIX(1.501321110) */
+#define FIX_1_847759065  ((INT32)  15137)	/* FIX(1.847759065) */
+#define FIX_1_961570560  ((INT32)  16069)	/* FIX(1.961570560) */
+#define FIX_2_053119869  ((INT32)  16819)	/* FIX(2.053119869) */
+#define FIX_2_562915447  ((INT32)  20995)	/* FIX(2.562915447) */
+#define FIX_3_072711026  ((INT32)  25172)	/* FIX(3.072711026) */
+#else
+#define FIX_0_298631336  FIX(0.298631336)
+#define FIX_0_390180644  FIX(0.390180644)
+#define FIX_0_541196100  FIX(0.541196100)
+#define FIX_0_765366865  FIX(0.765366865)
+#define FIX_0_899976223  FIX(0.899976223)
+#define FIX_1_175875602  FIX(1.175875602)
+#define FIX_1_501321110  FIX(1.501321110)
+#define FIX_1_847759065  FIX(1.847759065)
+#define FIX_1_961570560  FIX(1.961570560)
+#define FIX_2_053119869  FIX(2.053119869)
+#define FIX_2_562915447  FIX(2.562915447)
+#define FIX_3_072711026  FIX(3.072711026)
+#endif
+
+
+/* Multiply an INT32 variable by an INT32 constant to yield an INT32 result.
+ * For 8-bit samples with the recommended scaling, all the variable
+ * and constant values involved are no more than 16 bits wide, so a
+ * 16x16->32 bit multiply can be used instead of a full 32x32 multiply.
+ * For 12-bit samples, a full 32-bit multiplication will be needed.
+ */
+
+#if BITS_IN_JSAMPLE == 8
+#define MULTIPLY(var,const)  MULTIPLY16C16(var,const)
+#else
+#define MULTIPLY(var,const)  ((var) * (const))
+#endif
+
+
+/* Dequantize a coefficient by multiplying it by the multiplier-table
+ * entry; produce an int result.  In this module, both inputs and result
+ * are 16 bits or less, so either int or short multiply will work.
+ */
+
+#define DEQUANTIZE(coef,quantval)  (((ISLOW_MULT_TYPE) (coef)) * (quantval))
+
+
+/*
+ * Perform dequantization and inverse DCT on one block of coefficients.
+ */
+
+GLOBAL(void)
+jpeg_idct_islow (j_decompress_ptr cinfo, jpeg_component_info * compptr,
+		 JCOEFPTR coef_block,
+		 JSAMPARRAY output_buf, JDIMENSION output_col)
+{
+  INT32 tmp0, tmp1, tmp2, tmp3;
+  INT32 tmp10, tmp11, tmp12, tmp13;
+  INT32 z1, z2, z3, z4, z5;
+  JCOEFPTR inptr;
+  ISLOW_MULT_TYPE * quantptr;
+  int * wsptr;
+  JSAMPROW outptr;
+  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
+  int ctr;
+  int workspace[DCTSIZE2];	/* buffers data between passes */
+  SHIFT_TEMPS
+
+  /* Pass 1: process columns from input, store into work array. */
+  /* Note results are scaled up by sqrt(8) compared to a true IDCT; */
+  /* furthermore, we scale the results by 2**PASS1_BITS. */
+
+  inptr = coef_block;
+  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
+  wsptr = workspace;
+  for (ctr = DCTSIZE; ctr > 0; ctr--) {
+    /* Due to quantization, we will usually find that many of the input
+     * coefficients are zero, especially the AC terms.  We can exploit this
+     * by short-circuiting the IDCT calculation for any column in which all
+     * the AC terms are zero.  In that case each output is equal to the
+     * DC coefficient (with scale factor as needed).
+     * With typical images and quantization tables, half or more of the
+     * column DCT calculations can be simplified this way.
+     */
+    
+    if (inptr[DCTSIZE*1] == 0 && inptr[DCTSIZE*2] == 0 &&
+	inptr[DCTSIZE*3] == 0 && inptr[DCTSIZE*4] == 0 &&
+	inptr[DCTSIZE*5] == 0 && inptr[DCTSIZE*6] == 0 &&
+	inptr[DCTSIZE*7] == 0) {
+      /* AC terms all zero */
+      int dcval = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) << PASS1_BITS;
+      
+      wsptr[DCTSIZE*0] = dcval;
+      wsptr[DCTSIZE*1] = dcval;
+      wsptr[DCTSIZE*2] = dcval;
+      wsptr[DCTSIZE*3] = dcval;
+      wsptr[DCTSIZE*4] = dcval;
+      wsptr[DCTSIZE*5] = dcval;
+      wsptr[DCTSIZE*6] = dcval;
+      wsptr[DCTSIZE*7] = dcval;
+      
+      inptr++;			/* advance pointers to next column */
+      quantptr++;
+      wsptr++;
+      continue;
+    }
+    
+    /* Even part: reverse the even part of the forward DCT. */
+    /* The rotator is sqrt(2)*c(-6). */
+    
+    z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
+    z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]);
+    
+    z1 = MULTIPLY(z2 + z3, FIX_0_541196100);
+    tmp2 = z1 + MULTIPLY(z3, - FIX_1_847759065);
+    tmp3 = z1 + MULTIPLY(z2, FIX_0_765366865);
+    
+    z2 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
+    z3 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]);
+
+    tmp0 = (z2 + z3) << CONST_BITS;
+    tmp1 = (z2 - z3) << CONST_BITS;
+    
+    tmp10 = tmp0 + tmp3;
+    tmp13 = tmp0 - tmp3;
+    tmp11 = tmp1 + tmp2;
+    tmp12 = tmp1 - tmp2;
+    
+    /* Odd part per figure 8; the matrix is unitary and hence its
+     * transpose is its inverse.  i0..i3 are y7,y5,y3,y1 respectively.
+     */
+    
+    tmp0 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]);
+    tmp1 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
+    tmp2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
+    tmp3 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
+    
+    z1 = tmp0 + tmp3;
+    z2 = tmp1 + tmp2;
+    z3 = tmp0 + tmp2;
+    z4 = tmp1 + tmp3;
+    z5 = MULTIPLY(z3 + z4, FIX_1_175875602); /* sqrt(2) * c3 */
+    
+    tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */
+    tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */
+    tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */
+    tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */
+    z1 = MULTIPLY(z1, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */
+    z2 = MULTIPLY(z2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */
+    z3 = MULTIPLY(z3, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */
+    z4 = MULTIPLY(z4, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */
+    
+    z3 += z5;
+    z4 += z5;
+    
+    tmp0 += z1 + z3;
+    tmp1 += z2 + z4;
+    tmp2 += z2 + z3;
+    tmp3 += z1 + z4;
+    
+    /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */
+    
+    wsptr[DCTSIZE*0] = (int) DESCALE(tmp10 + tmp3, CONST_BITS-PASS1_BITS);
+    wsptr[DCTSIZE*7] = (int) DESCALE(tmp10 - tmp3, CONST_BITS-PASS1_BITS);
+    wsptr[DCTSIZE*1] = (int) DESCALE(tmp11 + tmp2, CONST_BITS-PASS1_BITS);
+    wsptr[DCTSIZE*6] = (int) DESCALE(tmp11 - tmp2, CONST_BITS-PASS1_BITS);
+    wsptr[DCTSIZE*2] = (int) DESCALE(tmp12 + tmp1, CONST_BITS-PASS1_BITS);
+    wsptr[DCTSIZE*5] = (int) DESCALE(tmp12 - tmp1, CONST_BITS-PASS1_BITS);
+    wsptr[DCTSIZE*3] = (int) DESCALE(tmp13 + tmp0, CONST_BITS-PASS1_BITS);
+    wsptr[DCTSIZE*4] = (int) DESCALE(tmp13 - tmp0, CONST_BITS-PASS1_BITS);
+    
+    inptr++;			/* advance pointers to next column */
+    quantptr++;
+    wsptr++;
+  }
+  
+  /* Pass 2: process rows from work array, store into output array. */
+  /* Note that we must descale the results by a factor of 8 == 2**3, */
+  /* and also undo the PASS1_BITS scaling. */
+
+  wsptr = workspace;
+  for (ctr = 0; ctr < DCTSIZE; ctr++) {
+    outptr = output_buf[ctr] + output_col;
+    /* Rows of zeroes can be exploited in the same way as we did with columns.
+     * However, the column calculation has created many nonzero AC terms, so
+     * the simplification applies less often (typically 5% to 10% of the time).
+     * On machines with very fast multiplication, it's possible that the
+     * test takes more time than it's worth.  In that case this section
+     * may be commented out.
+     */
+    
+#ifndef NO_ZERO_ROW_TEST
+    if (wsptr[1] == 0 && wsptr[2] == 0 && wsptr[3] == 0 && wsptr[4] == 0 &&
+	wsptr[5] == 0 && wsptr[6] == 0 && wsptr[7] == 0) {
+      /* AC terms all zero */
+      JSAMPLE dcval = range_limit[(int) DESCALE((INT32) wsptr[0], PASS1_BITS+3)
+				  & RANGE_MASK];
+      
+      outptr[0] = dcval;
+      outptr[1] = dcval;
+      outptr[2] = dcval;
+      outptr[3] = dcval;
+      outptr[4] = dcval;
+      outptr[5] = dcval;
+      outptr[6] = dcval;
+      outptr[7] = dcval;
+
+      wsptr += DCTSIZE;		/* advance pointer to next row */
+      continue;
+    }
+#endif
+    
+    /* Even part: reverse the even part of the forward DCT. */
+    /* The rotator is sqrt(2)*c(-6). */
+    
+    z2 = (INT32) wsptr[2];
+    z3 = (INT32) wsptr[6];
+    
+    z1 = MULTIPLY(z2 + z3, FIX_0_541196100);
+    tmp2 = z1 + MULTIPLY(z3, - FIX_1_847759065);
+    tmp3 = z1 + MULTIPLY(z2, FIX_0_765366865);
+    
+    tmp0 = ((INT32) wsptr[0] + (INT32) wsptr[4]) << CONST_BITS;
+    tmp1 = ((INT32) wsptr[0] - (INT32) wsptr[4]) << CONST_BITS;
+    
+    tmp10 = tmp0 + tmp3;
+    tmp13 = tmp0 - tmp3;
+    tmp11 = tmp1 + tmp2;
+    tmp12 = tmp1 - tmp2;
+    
+    /* Odd part per figure 8; the matrix is unitary and hence its
+     * transpose is its inverse.  i0..i3 are y7,y5,y3,y1 respectively.
+     */
+    
+    tmp0 = (INT32) wsptr[7];
+    tmp1 = (INT32) wsptr[5];
+    tmp2 = (INT32) wsptr[3];
+    tmp3 = (INT32) wsptr[1];
+    
+    z1 = tmp0 + tmp3;
+    z2 = tmp1 + tmp2;
+    z3 = tmp0 + tmp2;
+    z4 = tmp1 + tmp3;
+    z5 = MULTIPLY(z3 + z4, FIX_1_175875602); /* sqrt(2) * c3 */
+    
+    tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */
+    tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */
+    tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */
+    tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */
+    z1 = MULTIPLY(z1, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */
+    z2 = MULTIPLY(z2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */
+    z3 = MULTIPLY(z3, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */
+    z4 = MULTIPLY(z4, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */
+    
+    z3 += z5;
+    z4 += z5;
+    
+    tmp0 += z1 + z3;
+    tmp1 += z2 + z4;
+    tmp2 += z2 + z3;
+    tmp3 += z1 + z4;
+    
+    /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */
+    
+    outptr[0] = range_limit[(int) DESCALE(tmp10 + tmp3,
+					  CONST_BITS+PASS1_BITS+3)
+			    & RANGE_MASK];
+    outptr[7] = range_limit[(int) DESCALE(tmp10 - tmp3,
+					  CONST_BITS+PASS1_BITS+3)
+			    & RANGE_MASK];
+    outptr[1] = range_limit[(int) DESCALE(tmp11 + tmp2,
+					  CONST_BITS+PASS1_BITS+3)
+			    & RANGE_MASK];
+    outptr[6] = range_limit[(int) DESCALE(tmp11 - tmp2,
+					  CONST_BITS+PASS1_BITS+3)
+			    & RANGE_MASK];
+    outptr[2] = range_limit[(int) DESCALE(tmp12 + tmp1,
+					  CONST_BITS+PASS1_BITS+3)
+			    & RANGE_MASK];
+    outptr[5] = range_limit[(int) DESCALE(tmp12 - tmp1,
+					  CONST_BITS+PASS1_BITS+3)
+			    & RANGE_MASK];
+    outptr[3] = range_limit[(int) DESCALE(tmp13 + tmp0,
+					  CONST_BITS+PASS1_BITS+3)
+			    & RANGE_MASK];
+    outptr[4] = range_limit[(int) DESCALE(tmp13 - tmp0,
+					  CONST_BITS+PASS1_BITS+3)
+			    & RANGE_MASK];
+    
+    wsptr += DCTSIZE;		/* advance pointer to next row */
+  }
+}
+
+#endif /* DCT_ISLOW_SUPPORTED */
diff --git a/src/libjpeg-turbo/jidctred.c b/src/libjpeg-turbo/jidctred.c
new file mode 100644
index 0000000..421f3c7
--- /dev/null
+++ b/src/libjpeg-turbo/jidctred.c
@@ -0,0 +1,398 @@
+/*
+ * jidctred.c
+ *
+ * Copyright (C) 1994-1998, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains inverse-DCT routines that produce reduced-size output:
+ * either 4x4, 2x2, or 1x1 pixels from an 8x8 DCT block.
+ *
+ * The implementation is based on the Loeffler, Ligtenberg and Moschytz (LL&M)
+ * algorithm used in jidctint.c.  We simply replace each 8-to-8 1-D IDCT step
+ * with an 8-to-4 step that produces the four averages of two adjacent outputs
+ * (or an 8-to-2 step producing two averages of four outputs, for 2x2 output).
+ * These steps were derived by computing the corresponding values at the end
+ * of the normal LL&M code, then simplifying as much as possible.
+ *
+ * 1x1 is trivial: just take the DC coefficient divided by 8.
+ *
+ * See jidctint.c for additional comments.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jdct.h"		/* Private declarations for DCT subsystem */
+
+#ifdef IDCT_SCALING_SUPPORTED
+
+
+/*
+ * This module is specialized to the case DCTSIZE = 8.
+ */
+
+#if DCTSIZE != 8
+  Sorry, this code only copes with 8x8 DCTs. /* deliberate syntax err */
+#endif
+
+
+/* Scaling is the same as in jidctint.c. */
+
+#if BITS_IN_JSAMPLE == 8
+#define CONST_BITS  13
+#define PASS1_BITS  2
+#else
+#define CONST_BITS  13
+#define PASS1_BITS  1		/* lose a little precision to avoid overflow */
+#endif
+
+/* Some C compilers fail to reduce "FIX(constant)" at compile time, thus
+ * causing a lot of useless floating-point operations at run time.
+ * To get around this we use the following pre-calculated constants.
+ * If you change CONST_BITS you may want to add appropriate values.
+ * (With a reasonable C compiler, you can just rely on the FIX() macro...)
+ */
+
+#if CONST_BITS == 13
+#define FIX_0_211164243  ((INT32)  1730)	/* FIX(0.211164243) */
+#define FIX_0_509795579  ((INT32)  4176)	/* FIX(0.509795579) */
+#define FIX_0_601344887  ((INT32)  4926)	/* FIX(0.601344887) */
+#define FIX_0_720959822  ((INT32)  5906)	/* FIX(0.720959822) */
+#define FIX_0_765366865  ((INT32)  6270)	/* FIX(0.765366865) */
+#define FIX_0_850430095  ((INT32)  6967)	/* FIX(0.850430095) */
+#define FIX_0_899976223  ((INT32)  7373)	/* FIX(0.899976223) */
+#define FIX_1_061594337  ((INT32)  8697)	/* FIX(1.061594337) */
+#define FIX_1_272758580  ((INT32)  10426)	/* FIX(1.272758580) */
+#define FIX_1_451774981  ((INT32)  11893)	/* FIX(1.451774981) */
+#define FIX_1_847759065  ((INT32)  15137)	/* FIX(1.847759065) */
+#define FIX_2_172734803  ((INT32)  17799)	/* FIX(2.172734803) */
+#define FIX_2_562915447  ((INT32)  20995)	/* FIX(2.562915447) */
+#define FIX_3_624509785  ((INT32)  29692)	/* FIX(3.624509785) */
+#else
+#define FIX_0_211164243  FIX(0.211164243)
+#define FIX_0_509795579  FIX(0.509795579)
+#define FIX_0_601344887  FIX(0.601344887)
+#define FIX_0_720959822  FIX(0.720959822)
+#define FIX_0_765366865  FIX(0.765366865)
+#define FIX_0_850430095  FIX(0.850430095)
+#define FIX_0_899976223  FIX(0.899976223)
+#define FIX_1_061594337  FIX(1.061594337)
+#define FIX_1_272758580  FIX(1.272758580)
+#define FIX_1_451774981  FIX(1.451774981)
+#define FIX_1_847759065  FIX(1.847759065)
+#define FIX_2_172734803  FIX(2.172734803)
+#define FIX_2_562915447  FIX(2.562915447)
+#define FIX_3_624509785  FIX(3.624509785)
+#endif
+
+
+/* Multiply an INT32 variable by an INT32 constant to yield an INT32 result.
+ * For 8-bit samples with the recommended scaling, all the variable
+ * and constant values involved are no more than 16 bits wide, so a
+ * 16x16->32 bit multiply can be used instead of a full 32x32 multiply.
+ * For 12-bit samples, a full 32-bit multiplication will be needed.
+ */
+
+#if BITS_IN_JSAMPLE == 8
+#define MULTIPLY(var,const)  MULTIPLY16C16(var,const)
+#else
+#define MULTIPLY(var,const)  ((var) * (const))
+#endif
+
+
+/* Dequantize a coefficient by multiplying it by the multiplier-table
+ * entry; produce an int result.  In this module, both inputs and result
+ * are 16 bits or less, so either int or short multiply will work.
+ */
+
+#define DEQUANTIZE(coef,quantval)  (((ISLOW_MULT_TYPE) (coef)) * (quantval))
+
+
+/*
+ * Perform dequantization and inverse DCT on one block of coefficients,
+ * producing a reduced-size 4x4 output block.
+ */
+
+GLOBAL(void)
+jpeg_idct_4x4 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	       JCOEFPTR coef_block,
+	       JSAMPARRAY output_buf, JDIMENSION output_col)
+{
+  INT32 tmp0, tmp2, tmp10, tmp12;
+  INT32 z1, z2, z3, z4;
+  JCOEFPTR inptr;
+  ISLOW_MULT_TYPE * quantptr;
+  int * wsptr;
+  JSAMPROW outptr;
+  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
+  int ctr;
+  int workspace[DCTSIZE*4];	/* buffers data between passes */
+  SHIFT_TEMPS
+
+  /* Pass 1: process columns from input, store into work array. */
+
+  inptr = coef_block;
+  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
+  wsptr = workspace;
+  for (ctr = DCTSIZE; ctr > 0; inptr++, quantptr++, wsptr++, ctr--) {
+    /* Don't bother to process column 4, because second pass won't use it */
+    if (ctr == DCTSIZE-4)
+      continue;
+    if (inptr[DCTSIZE*1] == 0 && inptr[DCTSIZE*2] == 0 &&
+	inptr[DCTSIZE*3] == 0 && inptr[DCTSIZE*5] == 0 &&
+	inptr[DCTSIZE*6] == 0 && inptr[DCTSIZE*7] == 0) {
+      /* AC terms all zero; we need not examine term 4 for 4x4 output */
+      int dcval = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) << PASS1_BITS;
+      
+      wsptr[DCTSIZE*0] = dcval;
+      wsptr[DCTSIZE*1] = dcval;
+      wsptr[DCTSIZE*2] = dcval;
+      wsptr[DCTSIZE*3] = dcval;
+      
+      continue;
+    }
+    
+    /* Even part */
+    
+    tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
+    tmp0 <<= (CONST_BITS+1);
+    
+    z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
+    z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]);
+
+    tmp2 = MULTIPLY(z2, FIX_1_847759065) + MULTIPLY(z3, - FIX_0_765366865);
+    
+    tmp10 = tmp0 + tmp2;
+    tmp12 = tmp0 - tmp2;
+    
+    /* Odd part */
+    
+    z1 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]);
+    z2 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
+    z3 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
+    z4 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
+    
+    tmp0 = MULTIPLY(z1, - FIX_0_211164243) /* sqrt(2) * (c3-c1) */
+	 + MULTIPLY(z2, FIX_1_451774981) /* sqrt(2) * (c3+c7) */
+	 + MULTIPLY(z3, - FIX_2_172734803) /* sqrt(2) * (-c1-c5) */
+	 + MULTIPLY(z4, FIX_1_061594337); /* sqrt(2) * (c5+c7) */
+    
+    tmp2 = MULTIPLY(z1, - FIX_0_509795579) /* sqrt(2) * (c7-c5) */
+	 + MULTIPLY(z2, - FIX_0_601344887) /* sqrt(2) * (c5-c1) */
+	 + MULTIPLY(z3, FIX_0_899976223) /* sqrt(2) * (c3-c7) */
+	 + MULTIPLY(z4, FIX_2_562915447); /* sqrt(2) * (c1+c3) */
+
+    /* Final output stage */
+    
+    wsptr[DCTSIZE*0] = (int) DESCALE(tmp10 + tmp2, CONST_BITS-PASS1_BITS+1);
+    wsptr[DCTSIZE*3] = (int) DESCALE(tmp10 - tmp2, CONST_BITS-PASS1_BITS+1);
+    wsptr[DCTSIZE*1] = (int) DESCALE(tmp12 + tmp0, CONST_BITS-PASS1_BITS+1);
+    wsptr[DCTSIZE*2] = (int) DESCALE(tmp12 - tmp0, CONST_BITS-PASS1_BITS+1);
+  }
+  
+  /* Pass 2: process 4 rows from work array, store into output array. */
+
+  wsptr = workspace;
+  for (ctr = 0; ctr < 4; ctr++) {
+    outptr = output_buf[ctr] + output_col;
+    /* It's not clear whether a zero row test is worthwhile here ... */
+
+#ifndef NO_ZERO_ROW_TEST
+    if (wsptr[1] == 0 && wsptr[2] == 0 && wsptr[3] == 0 &&
+	wsptr[5] == 0 && wsptr[6] == 0 && wsptr[7] == 0) {
+      /* AC terms all zero */
+      JSAMPLE dcval = range_limit[(int) DESCALE((INT32) wsptr[0], PASS1_BITS+3)
+				  & RANGE_MASK];
+      
+      outptr[0] = dcval;
+      outptr[1] = dcval;
+      outptr[2] = dcval;
+      outptr[3] = dcval;
+      
+      wsptr += DCTSIZE;		/* advance pointer to next row */
+      continue;
+    }
+#endif
+    
+    /* Even part */
+    
+    tmp0 = ((INT32) wsptr[0]) << (CONST_BITS+1);
+    
+    tmp2 = MULTIPLY((INT32) wsptr[2], FIX_1_847759065)
+	 + MULTIPLY((INT32) wsptr[6], - FIX_0_765366865);
+    
+    tmp10 = tmp0 + tmp2;
+    tmp12 = tmp0 - tmp2;
+    
+    /* Odd part */
+    
+    z1 = (INT32) wsptr[7];
+    z2 = (INT32) wsptr[5];
+    z3 = (INT32) wsptr[3];
+    z4 = (INT32) wsptr[1];
+    
+    tmp0 = MULTIPLY(z1, - FIX_0_211164243) /* sqrt(2) * (c3-c1) */
+	 + MULTIPLY(z2, FIX_1_451774981) /* sqrt(2) * (c3+c7) */
+	 + MULTIPLY(z3, - FIX_2_172734803) /* sqrt(2) * (-c1-c5) */
+	 + MULTIPLY(z4, FIX_1_061594337); /* sqrt(2) * (c5+c7) */
+    
+    tmp2 = MULTIPLY(z1, - FIX_0_509795579) /* sqrt(2) * (c7-c5) */
+	 + MULTIPLY(z2, - FIX_0_601344887) /* sqrt(2) * (c5-c1) */
+	 + MULTIPLY(z3, FIX_0_899976223) /* sqrt(2) * (c3-c7) */
+	 + MULTIPLY(z4, FIX_2_562915447); /* sqrt(2) * (c1+c3) */
+
+    /* Final output stage */
+    
+    outptr[0] = range_limit[(int) DESCALE(tmp10 + tmp2,
+					  CONST_BITS+PASS1_BITS+3+1)
+			    & RANGE_MASK];
+    outptr[3] = range_limit[(int) DESCALE(tmp10 - tmp2,
+					  CONST_BITS+PASS1_BITS+3+1)
+			    & RANGE_MASK];
+    outptr[1] = range_limit[(int) DESCALE(tmp12 + tmp0,
+					  CONST_BITS+PASS1_BITS+3+1)
+			    & RANGE_MASK];
+    outptr[2] = range_limit[(int) DESCALE(tmp12 - tmp0,
+					  CONST_BITS+PASS1_BITS+3+1)
+			    & RANGE_MASK];
+    
+    wsptr += DCTSIZE;		/* advance pointer to next row */
+  }
+}
+
+
+/*
+ * Perform dequantization and inverse DCT on one block of coefficients,
+ * producing a reduced-size 2x2 output block.
+ */
+
+GLOBAL(void)
+jpeg_idct_2x2 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	       JCOEFPTR coef_block,
+	       JSAMPARRAY output_buf, JDIMENSION output_col)
+{
+  INT32 tmp0, tmp10, z1;
+  JCOEFPTR inptr;
+  ISLOW_MULT_TYPE * quantptr;
+  int * wsptr;
+  JSAMPROW outptr;
+  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
+  int ctr;
+  int workspace[DCTSIZE*2];	/* buffers data between passes */
+  SHIFT_TEMPS
+
+  /* Pass 1: process columns from input, store into work array. */
+
+  inptr = coef_block;
+  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
+  wsptr = workspace;
+  for (ctr = DCTSIZE; ctr > 0; inptr++, quantptr++, wsptr++, ctr--) {
+    /* Don't bother to process columns 2,4,6 */
+    if (ctr == DCTSIZE-2 || ctr == DCTSIZE-4 || ctr == DCTSIZE-6)
+      continue;
+    if (inptr[DCTSIZE*1] == 0 && inptr[DCTSIZE*3] == 0 &&
+	inptr[DCTSIZE*5] == 0 && inptr[DCTSIZE*7] == 0) {
+      /* AC terms all zero; we need not examine terms 2,4,6 for 2x2 output */
+      int dcval = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) << PASS1_BITS;
+      
+      wsptr[DCTSIZE*0] = dcval;
+      wsptr[DCTSIZE*1] = dcval;
+      
+      continue;
+    }
+    
+    /* Even part */
+    
+    z1 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
+    tmp10 = z1 << (CONST_BITS+2);
+    
+    /* Odd part */
+
+    z1 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]);
+    tmp0 = MULTIPLY(z1, - FIX_0_720959822); /* sqrt(2) * (c7-c5+c3-c1) */
+    z1 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
+    tmp0 += MULTIPLY(z1, FIX_0_850430095); /* sqrt(2) * (-c1+c3+c5+c7) */
+    z1 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
+    tmp0 += MULTIPLY(z1, - FIX_1_272758580); /* sqrt(2) * (-c1+c3-c5-c7) */
+    z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
+    tmp0 += MULTIPLY(z1, FIX_3_624509785); /* sqrt(2) * (c1+c3+c5+c7) */
+
+    /* Final output stage */
+    
+    wsptr[DCTSIZE*0] = (int) DESCALE(tmp10 + tmp0, CONST_BITS-PASS1_BITS+2);
+    wsptr[DCTSIZE*1] = (int) DESCALE(tmp10 - tmp0, CONST_BITS-PASS1_BITS+2);
+  }
+  
+  /* Pass 2: process 2 rows from work array, store into output array. */
+
+  wsptr = workspace;
+  for (ctr = 0; ctr < 2; ctr++) {
+    outptr = output_buf[ctr] + output_col;
+    /* It's not clear whether a zero row test is worthwhile here ... */
+
+#ifndef NO_ZERO_ROW_TEST
+    if (wsptr[1] == 0 && wsptr[3] == 0 && wsptr[5] == 0 && wsptr[7] == 0) {
+      /* AC terms all zero */
+      JSAMPLE dcval = range_limit[(int) DESCALE((INT32) wsptr[0], PASS1_BITS+3)
+				  & RANGE_MASK];
+      
+      outptr[0] = dcval;
+      outptr[1] = dcval;
+      
+      wsptr += DCTSIZE;		/* advance pointer to next row */
+      continue;
+    }
+#endif
+    
+    /* Even part */
+    
+    tmp10 = ((INT32) wsptr[0]) << (CONST_BITS+2);
+    
+    /* Odd part */
+
+    tmp0 = MULTIPLY((INT32) wsptr[7], - FIX_0_720959822) /* sqrt(2) * (c7-c5+c3-c1) */
+	 + MULTIPLY((INT32) wsptr[5], FIX_0_850430095) /* sqrt(2) * (-c1+c3+c5+c7) */
+	 + MULTIPLY((INT32) wsptr[3], - FIX_1_272758580) /* sqrt(2) * (-c1+c3-c5-c7) */
+	 + MULTIPLY((INT32) wsptr[1], FIX_3_624509785); /* sqrt(2) * (c1+c3+c5+c7) */
+
+    /* Final output stage */
+    
+    outptr[0] = range_limit[(int) DESCALE(tmp10 + tmp0,
+					  CONST_BITS+PASS1_BITS+3+2)
+			    & RANGE_MASK];
+    outptr[1] = range_limit[(int) DESCALE(tmp10 - tmp0,
+					  CONST_BITS+PASS1_BITS+3+2)
+			    & RANGE_MASK];
+    
+    wsptr += DCTSIZE;		/* advance pointer to next row */
+  }
+}
+
+
+/*
+ * Perform dequantization and inverse DCT on one block of coefficients,
+ * producing a reduced-size 1x1 output block.
+ */
+
+GLOBAL(void)
+jpeg_idct_1x1 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	       JCOEFPTR coef_block,
+	       JSAMPARRAY output_buf, JDIMENSION output_col)
+{
+  int dcval;
+  ISLOW_MULT_TYPE * quantptr;
+  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
+  SHIFT_TEMPS
+
+  /* We hardly need an inverse DCT routine for this: just take the
+   * average pixel value, which is one-eighth of the DC coefficient.
+   */
+  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
+  dcval = DEQUANTIZE(coef_block[0], quantptr[0]);
+  dcval = (int) DESCALE((INT32) dcval, 3);
+
+  output_buf[0][output_col] = range_limit[dcval & RANGE_MASK];
+}
+
+#endif /* IDCT_SCALING_SUPPORTED */
diff --git a/src/libjpeg-turbo/jinclude.h b/src/libjpeg-turbo/jinclude.h
new file mode 100644
index 0000000..0a4f151
--- /dev/null
+++ b/src/libjpeg-turbo/jinclude.h
@@ -0,0 +1,91 @@
+/*
+ * jinclude.h
+ *
+ * Copyright (C) 1991-1994, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file exists to provide a single place to fix any problems with
+ * including the wrong system include files.  (Common problems are taken
+ * care of by the standard jconfig symbols, but on really weird systems
+ * you may have to edit this file.)
+ *
+ * NOTE: this file is NOT intended to be included by applications using the
+ * JPEG library.  Most applications need only include jpeglib.h.
+ */
+
+
+/* Include auto-config file to find out which system include files we need. */
+
+#include "jconfig.h"		/* auto configuration options */
+#define JCONFIG_INCLUDED	/* so that jpeglib.h doesn't do it again */
+
+/*
+ * We need the NULL macro and size_t typedef.
+ * On an ANSI-conforming system it is sufficient to include <stddef.h>.
+ * Otherwise, we get them from <stdlib.h> or <stdio.h>; we may have to
+ * pull in <sys/types.h> as well.
+ * Note that the core JPEG library does not require <stdio.h>;
+ * only the default error handler and data source/destination modules do.
+ * But we must pull it in because of the references to FILE in jpeglib.h.
+ * You can remove those references if you want to compile without <stdio.h>.
+ */
+
+#ifdef HAVE_STDDEF_H
+#include <stddef.h>
+#endif
+
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+
+#ifdef NEED_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+
+#include <stdio.h>
+
+/*
+ * We need memory copying and zeroing functions, plus strncpy().
+ * ANSI and System V implementations declare these in <string.h>.
+ * BSD doesn't have the mem() functions, but it does have bcopy()/bzero().
+ * Some systems may declare memset and memcpy in <memory.h>.
+ *
+ * NOTE: we assume the size parameters to these functions are of type size_t.
+ * Change the casts in these macros if not!
+ */
+
+#ifdef NEED_BSD_STRINGS
+
+#include <strings.h>
+#define MEMZERO(target,size)	bzero((void *)(target), (size_t)(size))
+#define MEMCOPY(dest,src,size)	bcopy((const void *)(src), (void *)(dest), (size_t)(size))
+
+#else /* not BSD, assume ANSI/SysV string lib */
+
+#include <string.h>
+#define MEMZERO(target,size)	memset((void *)(target), 0, (size_t)(size))
+#define MEMCOPY(dest,src,size)	memcpy((void *)(dest), (const void *)(src), (size_t)(size))
+
+#endif
+
+/*
+ * In ANSI C, and indeed any rational implementation, size_t is also the
+ * type returned by sizeof().  However, it seems there are some irrational
+ * implementations out there, in which sizeof() returns an int even though
+ * size_t is defined as long or unsigned long.  To ensure consistent results
+ * we always use this SIZEOF() macro in place of using sizeof() directly.
+ */
+
+#define SIZEOF(object)	((size_t) sizeof(object))
+
+/*
+ * The modules that use fread() and fwrite() always invoke them through
+ * these macros.  On some systems you may need to twiddle the argument casts.
+ * CAUTION: argument order is different from underlying functions!
+ */
+
+#define JFREAD(file,buf,sizeofbuf)  \
+  ((size_t) fread((void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file)))
+#define JFWRITE(file,buf,sizeofbuf)  \
+  ((size_t) fwrite((const void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file)))
diff --git a/src/libjpeg-turbo/jmemmgr.c b/src/libjpeg-turbo/jmemmgr.c
new file mode 100644
index 0000000..cf32524
--- /dev/null
+++ b/src/libjpeg-turbo/jmemmgr.c
@@ -0,0 +1,1151 @@
+/*
+ * jmemmgr.c
+ *
+ * Copyright (C) 1991-1997, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains the JPEG system-independent memory management
+ * routines.  This code is usable across a wide variety of machines; most
+ * of the system dependencies have been isolated in a separate file.
+ * The major functions provided here are:
+ *   * pool-based allocation and freeing of memory;
+ *   * policy decisions about how to divide available memory among the
+ *     virtual arrays;
+ *   * control logic for swapping virtual arrays between main memory and
+ *     backing storage.
+ * The separate system-dependent file provides the actual backing-storage
+ * access code, and it contains the policy decision about how much total
+ * main memory to use.
+ * This file is system-dependent in the sense that some of its functions
+ * are unnecessary in some systems.  For example, if there is enough virtual
+ * memory so that backing storage will never be used, much of the virtual
+ * array control logic could be removed.  (Of course, if you have that much
+ * memory then you shouldn't care about a little bit of unused code...)
+ */
+
+#define JPEG_INTERNALS
+#define AM_MEMORY_MANAGER	/* we define jvirt_Xarray_control structs */
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jmemsys.h"		/* import the system-dependent declarations */
+
+#ifndef NO_GETENV
+#ifndef HAVE_STDLIB_H		/* <stdlib.h> should declare getenv() */
+extern char * getenv JPP((const char * name));
+#endif
+#endif
+
+
+LOCAL(size_t)
+round_up_pow2 (size_t a, size_t b)
+/* a rounded up to the next multiple of b, i.e. ceil(a/b)*b */
+/* Assumes a >= 0, b > 0, and b is a power of 2 */
+{
+  return ((a + b - 1) & (~(b - 1)));
+}
+
+
+/*
+ * Some important notes:
+ *   The allocation routines provided here must never return NULL.
+ *   They should exit to error_exit if unsuccessful.
+ *
+ *   It's not a good idea to try to merge the sarray and barray routines,
+ *   even though they are textually almost the same, because samples are
+ *   usually stored as bytes while coefficients are shorts or ints.  Thus,
+ *   in machines where byte pointers have a different representation from
+ *   word pointers, the resulting machine code could not be the same.
+ */
+
+
+/*
+ * Many machines require storage alignment: longs must start on 4-byte
+ * boundaries, doubles on 8-byte boundaries, etc.  On such machines, malloc()
+ * always returns pointers that are multiples of the worst-case alignment
+ * requirement, and we had better do so too.
+ * There isn't any really portable way to determine the worst-case alignment
+ * requirement.  This module assumes that the alignment requirement is
+ * multiples of ALIGN_SIZE.
+ * By default, we define ALIGN_SIZE as sizeof(double).  This is necessary on some
+ * workstations (where doubles really do need 8-byte alignment) and will work
+ * fine on nearly everything.  If your machine has lesser alignment needs,
+ * you can save a few bytes by making ALIGN_SIZE smaller.
+ * The only place I know of where this will NOT work is certain Macintosh
+ * 680x0 compilers that define double as a 10-byte IEEE extended float.
+ * Doing 10-byte alignment is counterproductive because longwords won't be
+ * aligned well.  Put "#define ALIGN_SIZE 4" in jconfig.h if you have
+ * such a compiler.
+ */
+
+#ifndef ALIGN_SIZE		/* so can override from jconfig.h */
+#ifndef WITH_SIMD
+#define ALIGN_SIZE  SIZEOF(double)
+#else
+#define ALIGN_SIZE  16 /* Most SIMD implementations require this */
+#endif
+#endif
+
+/*
+ * We allocate objects from "pools", where each pool is gotten with a single
+ * request to jpeg_get_small() or jpeg_get_large().  There is no per-object
+ * overhead within a pool, except for alignment padding.  Each pool has a
+ * header with a link to the next pool of the same class.
+ * Small and large pool headers are identical except that the latter's
+ * link pointer must be FAR on 80x86 machines.
+ */
+
+typedef struct small_pool_struct * small_pool_ptr;
+
+typedef struct small_pool_struct {
+  small_pool_ptr next;	/* next in list of pools */
+  size_t bytes_used;		/* how many bytes already used within pool */
+  size_t bytes_left;		/* bytes still available in this pool */
+} small_pool_hdr;
+
+typedef struct large_pool_struct FAR * large_pool_ptr;
+
+typedef struct large_pool_struct {
+  large_pool_ptr next;	/* next in list of pools */
+  size_t bytes_used;		/* how many bytes already used within pool */
+  size_t bytes_left;		/* bytes still available in this pool */
+} large_pool_hdr;
+
+/*
+ * Here is the full definition of a memory manager object.
+ */
+
+typedef struct {
+  struct jpeg_memory_mgr pub;	/* public fields */
+
+  /* Each pool identifier (lifetime class) names a linked list of pools. */
+  small_pool_ptr small_list[JPOOL_NUMPOOLS];
+  large_pool_ptr large_list[JPOOL_NUMPOOLS];
+
+  /* Since we only have one lifetime class of virtual arrays, only one
+   * linked list is necessary (for each datatype).  Note that the virtual
+   * array control blocks being linked together are actually stored somewhere
+   * in the small-pool list.
+   */
+  jvirt_sarray_ptr virt_sarray_list;
+  jvirt_barray_ptr virt_barray_list;
+
+  /* This counts total space obtained from jpeg_get_small/large */
+  size_t total_space_allocated;
+
+  /* alloc_sarray and alloc_barray set this value for use by virtual
+   * array routines.
+   */
+  JDIMENSION last_rowsperchunk;	/* from most recent alloc_sarray/barray */
+} my_memory_mgr;
+
+typedef my_memory_mgr * my_mem_ptr;
+
+
+/*
+ * The control blocks for virtual arrays.
+ * Note that these blocks are allocated in the "small" pool area.
+ * System-dependent info for the associated backing store (if any) is hidden
+ * inside the backing_store_info struct.
+ */
+
+struct jvirt_sarray_control {
+  JSAMPARRAY mem_buffer;	/* => the in-memory buffer */
+  JDIMENSION rows_in_array;	/* total virtual array height */
+  JDIMENSION samplesperrow;	/* width of array (and of memory buffer) */
+  JDIMENSION maxaccess;		/* max rows accessed by access_virt_sarray */
+  JDIMENSION rows_in_mem;	/* height of memory buffer */
+  JDIMENSION rowsperchunk;	/* allocation chunk size in mem_buffer */
+  JDIMENSION cur_start_row;	/* first logical row # in the buffer */
+  JDIMENSION first_undef_row;	/* row # of first uninitialized row */
+  boolean pre_zero;		/* pre-zero mode requested? */
+  boolean dirty;		/* do current buffer contents need written? */
+  boolean b_s_open;		/* is backing-store data valid? */
+  jvirt_sarray_ptr next;	/* link to next virtual sarray control block */
+  backing_store_info b_s_info;	/* System-dependent control info */
+};
+
+struct jvirt_barray_control {
+  JBLOCKARRAY mem_buffer;	/* => the in-memory buffer */
+  JDIMENSION rows_in_array;	/* total virtual array height */
+  JDIMENSION blocksperrow;	/* width of array (and of memory buffer) */
+  JDIMENSION maxaccess;		/* max rows accessed by access_virt_barray */
+  JDIMENSION rows_in_mem;	/* height of memory buffer */
+  JDIMENSION rowsperchunk;	/* allocation chunk size in mem_buffer */
+  JDIMENSION cur_start_row;	/* first logical row # in the buffer */
+  JDIMENSION first_undef_row;	/* row # of first uninitialized row */
+  boolean pre_zero;		/* pre-zero mode requested? */
+  boolean dirty;		/* do current buffer contents need written? */
+  boolean b_s_open;		/* is backing-store data valid? */
+  jvirt_barray_ptr next;	/* link to next virtual barray control block */
+  backing_store_info b_s_info;	/* System-dependent control info */
+};
+
+
+#ifdef MEM_STATS		/* optional extra stuff for statistics */
+
+LOCAL(void)
+print_mem_stats (j_common_ptr cinfo, int pool_id)
+{
+  my_mem_ptr mem = (my_mem_ptr) cinfo->mem;
+  small_pool_ptr shdr_ptr;
+  large_pool_ptr lhdr_ptr;
+
+  /* Since this is only a debugging stub, we can cheat a little by using
+   * fprintf directly rather than going through the trace message code.
+   * This is helpful because message parm array can't handle longs.
+   */
+  fprintf(stderr, "Freeing pool %d, total space = %ld\n",
+	  pool_id, mem->total_space_allocated);
+
+  for (lhdr_ptr = mem->large_list[pool_id]; lhdr_ptr != NULL;
+       lhdr_ptr = lhdr_ptr->next) {
+    fprintf(stderr, "  Large chunk used %ld\n",
+	    (long) lhdr_ptr->bytes_used);
+  }
+
+  for (shdr_ptr = mem->small_list[pool_id]; shdr_ptr != NULL;
+       shdr_ptr = shdr_ptr->next) {
+    fprintf(stderr, "  Small chunk used %ld free %ld\n",
+	    (long) shdr_ptr->bytes_used,
+	    (long) shdr_ptr->bytes_left);
+  }
+}
+
+#endif /* MEM_STATS */
+
+
+LOCAL(void)
+out_of_memory (j_common_ptr cinfo, int which)
+/* Report an out-of-memory error and stop execution */
+/* If we compiled MEM_STATS support, report alloc requests before dying */
+{
+#ifdef MEM_STATS
+  cinfo->err->trace_level = 2;	/* force self_destruct to report stats */
+#endif
+  ERREXIT1(cinfo, JERR_OUT_OF_MEMORY, which);
+}
+
+
+/*
+ * Allocation of "small" objects.
+ *
+ * For these, we use pooled storage.  When a new pool must be created,
+ * we try to get enough space for the current request plus a "slop" factor,
+ * where the slop will be the amount of leftover space in the new pool.
+ * The speed vs. space tradeoff is largely determined by the slop values.
+ * A different slop value is provided for each pool class (lifetime),
+ * and we also distinguish the first pool of a class from later ones.
+ * NOTE: the values given work fairly well on both 16- and 32-bit-int
+ * machines, but may be too small if longs are 64 bits or more.
+ *
+ * Since we do not know what alignment malloc() gives us, we have to
+ * allocate ALIGN_SIZE-1 extra space per pool to have room for alignment
+ * adjustment.
+ */
+
+static const size_t first_pool_slop[JPOOL_NUMPOOLS] = 
+{
+	1600,			/* first PERMANENT pool */
+	16000			/* first IMAGE pool */
+};
+
+static const size_t extra_pool_slop[JPOOL_NUMPOOLS] = 
+{
+	0,			/* additional PERMANENT pools */
+	5000			/* additional IMAGE pools */
+};
+
+#define MIN_SLOP  50		/* greater than 0 to avoid futile looping */
+
+
+METHODDEF(void *)
+alloc_small (j_common_ptr cinfo, int pool_id, size_t sizeofobject)
+/* Allocate a "small" object */
+{
+  my_mem_ptr mem = (my_mem_ptr) cinfo->mem;
+  small_pool_ptr hdr_ptr, prev_hdr_ptr;
+  char * data_ptr;
+  size_t min_request, slop;
+
+  /*
+   * Round up the requested size to a multiple of ALIGN_SIZE in order
+   * to assure alignment for the next object allocated in the same pool
+   * and so that algorithms can straddle outside the proper area up
+   * to the next alignment.
+   */
+  sizeofobject = round_up_pow2(sizeofobject, ALIGN_SIZE);
+
+  /* Check for unsatisfiable request (do now to ensure no overflow below) */
+  if ((SIZEOF(small_pool_hdr) + sizeofobject + ALIGN_SIZE - 1) > MAX_ALLOC_CHUNK)
+    out_of_memory(cinfo, 1);	/* request exceeds malloc's ability */
+
+  /* See if space is available in any existing pool */
+  if (pool_id < 0 || pool_id >= JPOOL_NUMPOOLS)
+    ERREXIT1(cinfo, JERR_BAD_POOL_ID, pool_id);	/* safety check */
+  prev_hdr_ptr = NULL;
+  hdr_ptr = mem->small_list[pool_id];
+  while (hdr_ptr != NULL) {
+    if (hdr_ptr->bytes_left >= sizeofobject)
+      break;			/* found pool with enough space */
+    prev_hdr_ptr = hdr_ptr;
+    hdr_ptr = hdr_ptr->next;
+  }
+
+  /* Time to make a new pool? */
+  if (hdr_ptr == NULL) {
+    /* min_request is what we need now, slop is what will be leftover */
+    min_request = SIZEOF(small_pool_hdr) + sizeofobject + ALIGN_SIZE - 1;
+    if (prev_hdr_ptr == NULL)	/* first pool in class? */
+      slop = first_pool_slop[pool_id];
+    else
+      slop = extra_pool_slop[pool_id];
+    /* Don't ask for more than MAX_ALLOC_CHUNK */
+    if (slop > (size_t) (MAX_ALLOC_CHUNK-min_request))
+      slop = (size_t) (MAX_ALLOC_CHUNK-min_request);
+    /* Try to get space, if fail reduce slop and try again */
+    for (;;) {
+      hdr_ptr = (small_pool_ptr) jpeg_get_small(cinfo, min_request + slop);
+      if (hdr_ptr != NULL)
+	break;
+      slop /= 2;
+      if (slop < MIN_SLOP)	/* give up when it gets real small */
+	out_of_memory(cinfo, 2); /* jpeg_get_small failed */
+    }
+    mem->total_space_allocated += min_request + slop;
+    /* Success, initialize the new pool header and add to end of list */
+    hdr_ptr->next = NULL;
+    hdr_ptr->bytes_used = 0;
+    hdr_ptr->bytes_left = sizeofobject + slop;
+    if (prev_hdr_ptr == NULL)	/* first pool in class? */
+      mem->small_list[pool_id] = hdr_ptr;
+    else
+      prev_hdr_ptr->next = hdr_ptr;
+  }
+
+  /* OK, allocate the object from the current pool */
+  data_ptr = (char *) hdr_ptr; /* point to first data byte in pool... */
+  data_ptr += SIZEOF(small_pool_hdr); /* ...by skipping the header... */
+  if ((size_t)data_ptr % ALIGN_SIZE) /* ...and adjust for alignment */
+    data_ptr += ALIGN_SIZE - (size_t)data_ptr % ALIGN_SIZE;
+  data_ptr += hdr_ptr->bytes_used; /* point to place for object */
+  hdr_ptr->bytes_used += sizeofobject;
+  hdr_ptr->bytes_left -= sizeofobject;
+
+  return (void *) data_ptr;
+}
+
+
+/*
+ * Allocation of "large" objects.
+ *
+ * The external semantics of these are the same as "small" objects,
+ * except that FAR pointers are used on 80x86.  However the pool
+ * management heuristics are quite different.  We assume that each
+ * request is large enough that it may as well be passed directly to
+ * jpeg_get_large; the pool management just links everything together
+ * so that we can free it all on demand.
+ * Note: the major use of "large" objects is in JSAMPARRAY and JBLOCKARRAY
+ * structures.  The routines that create these structures (see below)
+ * deliberately bunch rows together to ensure a large request size.
+ */
+
+METHODDEF(void FAR *)
+alloc_large (j_common_ptr cinfo, int pool_id, size_t sizeofobject)
+/* Allocate a "large" object */
+{
+  my_mem_ptr mem = (my_mem_ptr) cinfo->mem;
+  large_pool_ptr hdr_ptr;
+  char FAR * data_ptr;
+
+  /*
+   * Round up the requested size to a multiple of ALIGN_SIZE so that
+   * algorithms can straddle outside the proper area up to the next
+   * alignment.
+   */
+  sizeofobject = round_up_pow2(sizeofobject, ALIGN_SIZE);
+
+  /* Check for unsatisfiable request (do now to ensure no overflow below) */
+  if ((SIZEOF(large_pool_hdr) + sizeofobject + ALIGN_SIZE - 1) > MAX_ALLOC_CHUNK)
+    out_of_memory(cinfo, 3);	/* request exceeds malloc's ability */
+
+  /* Always make a new pool */
+  if (pool_id < 0 || pool_id >= JPOOL_NUMPOOLS)
+    ERREXIT1(cinfo, JERR_BAD_POOL_ID, pool_id);	/* safety check */
+
+  hdr_ptr = (large_pool_ptr) jpeg_get_large(cinfo, sizeofobject +
+					    SIZEOF(large_pool_hdr) +
+					    ALIGN_SIZE - 1);
+  if (hdr_ptr == NULL)
+    out_of_memory(cinfo, 4);	/* jpeg_get_large failed */
+  mem->total_space_allocated += sizeofobject + SIZEOF(large_pool_hdr) + ALIGN_SIZE - 1;
+
+  /* Success, initialize the new pool header and add to list */
+  hdr_ptr->next = mem->large_list[pool_id];
+  /* We maintain space counts in each pool header for statistical purposes,
+   * even though they are not needed for allocation.
+   */
+  hdr_ptr->bytes_used = sizeofobject;
+  hdr_ptr->bytes_left = 0;
+  mem->large_list[pool_id] = hdr_ptr;
+
+  data_ptr = (char *) hdr_ptr; /* point to first data byte in pool... */
+  data_ptr += SIZEOF(small_pool_hdr); /* ...by skipping the header... */
+  if ((size_t)data_ptr % ALIGN_SIZE) /* ...and adjust for alignment */
+    data_ptr += ALIGN_SIZE - (size_t)data_ptr % ALIGN_SIZE;
+
+  return (void FAR *) data_ptr;
+}
+
+
+/*
+ * Creation of 2-D sample arrays.
+ * The pointers are in near heap, the samples themselves in FAR heap.
+ *
+ * To minimize allocation overhead and to allow I/O of large contiguous
+ * blocks, we allocate the sample rows in groups of as many rows as possible
+ * without exceeding MAX_ALLOC_CHUNK total bytes per allocation request.
+ * NB: the virtual array control routines, later in this file, know about
+ * this chunking of rows.  The rowsperchunk value is left in the mem manager
+ * object so that it can be saved away if this sarray is the workspace for
+ * a virtual array.
+ *
+ * Since we are often upsampling with a factor 2, we align the size (not
+ * the start) to 2 * ALIGN_SIZE so that the upsampling routines don't have
+ * to be as careful about size.
+ */
+
+METHODDEF(JSAMPARRAY)
+alloc_sarray (j_common_ptr cinfo, int pool_id,
+	      JDIMENSION samplesperrow, JDIMENSION numrows)
+/* Allocate a 2-D sample array */
+{
+  my_mem_ptr mem = (my_mem_ptr) cinfo->mem;
+  JSAMPARRAY result;
+  JSAMPROW workspace;
+  JDIMENSION rowsperchunk, currow, i;
+  long ltemp;
+
+  /* Make sure each row is properly aligned */
+  if ((ALIGN_SIZE % SIZEOF(JSAMPLE)) != 0)
+    out_of_memory(cinfo, 5);	/* safety check */
+  samplesperrow = (JDIMENSION)round_up_pow2(samplesperrow, (2 * ALIGN_SIZE) / SIZEOF(JSAMPLE));
+
+  /* Calculate max # of rows allowed in one allocation chunk */
+  ltemp = (MAX_ALLOC_CHUNK-SIZEOF(large_pool_hdr)) /
+	  ((long) samplesperrow * SIZEOF(JSAMPLE));
+  if (ltemp <= 0)
+    ERREXIT(cinfo, JERR_WIDTH_OVERFLOW);
+  if (ltemp < (long) numrows)
+    rowsperchunk = (JDIMENSION) ltemp;
+  else
+    rowsperchunk = numrows;
+  mem->last_rowsperchunk = rowsperchunk;
+
+  /* Get space for row pointers (small object) */
+  result = (JSAMPARRAY) alloc_small(cinfo, pool_id,
+				    (size_t) (numrows * SIZEOF(JSAMPROW)));
+
+  /* Get the rows themselves (large objects) */
+  currow = 0;
+  while (currow < numrows) {
+    rowsperchunk = MIN(rowsperchunk, numrows - currow);
+    workspace = (JSAMPROW) alloc_large(cinfo, pool_id,
+	(size_t) ((size_t) rowsperchunk * (size_t) samplesperrow
+		  * SIZEOF(JSAMPLE)));
+    for (i = rowsperchunk; i > 0; i--) {
+      result[currow++] = workspace;
+      workspace += samplesperrow;
+    }
+  }
+
+  return result;
+}
+
+
+/*
+ * Creation of 2-D coefficient-block arrays.
+ * This is essentially the same as the code for sample arrays, above.
+ */
+
+METHODDEF(JBLOCKARRAY)
+alloc_barray (j_common_ptr cinfo, int pool_id,
+	      JDIMENSION blocksperrow, JDIMENSION numrows)
+/* Allocate a 2-D coefficient-block array */
+{
+  my_mem_ptr mem = (my_mem_ptr) cinfo->mem;
+  JBLOCKARRAY result;
+  JBLOCKROW workspace;
+  JDIMENSION rowsperchunk, currow, i;
+  long ltemp;
+
+  /* Make sure each row is properly aligned */
+  if ((SIZEOF(JBLOCK) % ALIGN_SIZE) != 0)
+    out_of_memory(cinfo, 6);	/* safety check */
+
+  /* Calculate max # of rows allowed in one allocation chunk */
+  ltemp = (MAX_ALLOC_CHUNK-SIZEOF(large_pool_hdr)) /
+	  ((long) blocksperrow * SIZEOF(JBLOCK));
+  if (ltemp <= 0)
+    ERREXIT(cinfo, JERR_WIDTH_OVERFLOW);
+  if (ltemp < (long) numrows)
+    rowsperchunk = (JDIMENSION) ltemp;
+  else
+    rowsperchunk = numrows;
+  mem->last_rowsperchunk = rowsperchunk;
+
+  /* Get space for row pointers (small object) */
+  result = (JBLOCKARRAY) alloc_small(cinfo, pool_id,
+				     (size_t) (numrows * SIZEOF(JBLOCKROW)));
+
+  /* Get the rows themselves (large objects) */
+  currow = 0;
+  while (currow < numrows) {
+    rowsperchunk = MIN(rowsperchunk, numrows - currow);
+    workspace = (JBLOCKROW) alloc_large(cinfo, pool_id,
+	(size_t) ((size_t) rowsperchunk * (size_t) blocksperrow
+		  * SIZEOF(JBLOCK)));
+    for (i = rowsperchunk; i > 0; i--) {
+      result[currow++] = workspace;
+      workspace += blocksperrow;
+    }
+  }
+
+  return result;
+}
+
+
+/*
+ * About virtual array management:
+ *
+ * The above "normal" array routines are only used to allocate strip buffers
+ * (as wide as the image, but just a few rows high).  Full-image-sized buffers
+ * are handled as "virtual" arrays.  The array is still accessed a strip at a
+ * time, but the memory manager must save the whole array for repeated
+ * accesses.  The intended implementation is that there is a strip buffer in
+ * memory (as high as is possible given the desired memory limit), plus a
+ * backing file that holds the rest of the array.
+ *
+ * The request_virt_array routines are told the total size of the image and
+ * the maximum number of rows that will be accessed at once.  The in-memory
+ * buffer must be at least as large as the maxaccess value.
+ *
+ * The request routines create control blocks but not the in-memory buffers.
+ * That is postponed until realize_virt_arrays is called.  At that time the
+ * total amount of space needed is known (approximately, anyway), so free
+ * memory can be divided up fairly.
+ *
+ * The access_virt_array routines are responsible for making a specific strip
+ * area accessible (after reading or writing the backing file, if necessary).
+ * Note that the access routines are told whether the caller intends to modify
+ * the accessed strip; during a read-only pass this saves having to rewrite
+ * data to disk.  The access routines are also responsible for pre-zeroing
+ * any newly accessed rows, if pre-zeroing was requested.
+ *
+ * In current usage, the access requests are usually for nonoverlapping
+ * strips; that is, successive access start_row numbers differ by exactly
+ * num_rows = maxaccess.  This means we can get good performance with simple
+ * buffer dump/reload logic, by making the in-memory buffer be a multiple
+ * of the access height; then there will never be accesses across bufferload
+ * boundaries.  The code will still work with overlapping access requests,
+ * but it doesn't handle bufferload overlaps very efficiently.
+ */
+
+
+METHODDEF(jvirt_sarray_ptr)
+request_virt_sarray (j_common_ptr cinfo, int pool_id, boolean pre_zero,
+		     JDIMENSION samplesperrow, JDIMENSION numrows,
+		     JDIMENSION maxaccess)
+/* Request a virtual 2-D sample array */
+{
+  my_mem_ptr mem = (my_mem_ptr) cinfo->mem;
+  jvirt_sarray_ptr result;
+
+  /* Only IMAGE-lifetime virtual arrays are currently supported */
+  if (pool_id != JPOOL_IMAGE)
+    ERREXIT1(cinfo, JERR_BAD_POOL_ID, pool_id);	/* safety check */
+
+  /* get control block */
+  result = (jvirt_sarray_ptr) alloc_small(cinfo, pool_id,
+					  SIZEOF(struct jvirt_sarray_control));
+
+  result->mem_buffer = NULL;	/* marks array not yet realized */
+  result->rows_in_array = numrows;
+  result->samplesperrow = samplesperrow;
+  result->maxaccess = maxaccess;
+  result->pre_zero = pre_zero;
+  result->b_s_open = FALSE;	/* no associated backing-store object */
+  result->next = mem->virt_sarray_list; /* add to list of virtual arrays */
+  mem->virt_sarray_list = result;
+
+  return result;
+}
+
+
+METHODDEF(jvirt_barray_ptr)
+request_virt_barray (j_common_ptr cinfo, int pool_id, boolean pre_zero,
+		     JDIMENSION blocksperrow, JDIMENSION numrows,
+		     JDIMENSION maxaccess)
+/* Request a virtual 2-D coefficient-block array */
+{
+  my_mem_ptr mem = (my_mem_ptr) cinfo->mem;
+  jvirt_barray_ptr result;
+
+  /* Only IMAGE-lifetime virtual arrays are currently supported */
+  if (pool_id != JPOOL_IMAGE)
+    ERREXIT1(cinfo, JERR_BAD_POOL_ID, pool_id);	/* safety check */
+
+  /* get control block */
+  result = (jvirt_barray_ptr) alloc_small(cinfo, pool_id,
+					  SIZEOF(struct jvirt_barray_control));
+
+  result->mem_buffer = NULL;	/* marks array not yet realized */
+  result->rows_in_array = numrows;
+  result->blocksperrow = blocksperrow;
+  result->maxaccess = maxaccess;
+  result->pre_zero = pre_zero;
+  result->b_s_open = FALSE;	/* no associated backing-store object */
+  result->next = mem->virt_barray_list; /* add to list of virtual arrays */
+  mem->virt_barray_list = result;
+
+  return result;
+}
+
+
+METHODDEF(void)
+realize_virt_arrays (j_common_ptr cinfo)
+/* Allocate the in-memory buffers for any unrealized virtual arrays */
+{
+  my_mem_ptr mem = (my_mem_ptr) cinfo->mem;
+  size_t space_per_minheight, maximum_space, avail_mem;
+  size_t minheights, max_minheights;
+  jvirt_sarray_ptr sptr;
+  jvirt_barray_ptr bptr;
+
+  /* Compute the minimum space needed (maxaccess rows in each buffer)
+   * and the maximum space needed (full image height in each buffer).
+   * These may be of use to the system-dependent jpeg_mem_available routine.
+   */
+  space_per_minheight = 0;
+  maximum_space = 0;
+  for (sptr = mem->virt_sarray_list; sptr != NULL; sptr = sptr->next) {
+    if (sptr->mem_buffer == NULL) { /* if not realized yet */
+      space_per_minheight += (long) sptr->maxaccess *
+			     (long) sptr->samplesperrow * SIZEOF(JSAMPLE);
+      maximum_space += (long) sptr->rows_in_array *
+		       (long) sptr->samplesperrow * SIZEOF(JSAMPLE);
+    }
+  }
+  for (bptr = mem->virt_barray_list; bptr != NULL; bptr = bptr->next) {
+    if (bptr->mem_buffer == NULL) { /* if not realized yet */
+      space_per_minheight += (long) bptr->maxaccess *
+			     (long) bptr->blocksperrow * SIZEOF(JBLOCK);
+      maximum_space += (long) bptr->rows_in_array *
+		       (long) bptr->blocksperrow * SIZEOF(JBLOCK);
+    }
+  }
+
+  if (space_per_minheight <= 0)
+    return;			/* no unrealized arrays, no work */
+
+  /* Determine amount of memory to actually use; this is system-dependent. */
+  avail_mem = jpeg_mem_available(cinfo, space_per_minheight, maximum_space,
+				 mem->total_space_allocated);
+
+  /* If the maximum space needed is available, make all the buffers full
+   * height; otherwise parcel it out with the same number of minheights
+   * in each buffer.
+   */
+  if (avail_mem >= maximum_space)
+    max_minheights = 1000000000L;
+  else {
+    max_minheights = avail_mem / space_per_minheight;
+    /* If there doesn't seem to be enough space, try to get the minimum
+     * anyway.  This allows a "stub" implementation of jpeg_mem_available().
+     */
+    if (max_minheights <= 0)
+      max_minheights = 1;
+  }
+
+  /* Allocate the in-memory buffers and initialize backing store as needed. */
+
+  for (sptr = mem->virt_sarray_list; sptr != NULL; sptr = sptr->next) {
+    if (sptr->mem_buffer == NULL) { /* if not realized yet */
+      minheights = ((long) sptr->rows_in_array - 1L) / sptr->maxaccess + 1L;
+      if (minheights <= max_minheights) {
+	/* This buffer fits in memory */
+	sptr->rows_in_mem = sptr->rows_in_array;
+      } else {
+	/* It doesn't fit in memory, create backing store. */
+	sptr->rows_in_mem = (JDIMENSION) (max_minheights * sptr->maxaccess);
+	jpeg_open_backing_store(cinfo, & sptr->b_s_info,
+				(long) sptr->rows_in_array *
+				(long) sptr->samplesperrow *
+				(long) SIZEOF(JSAMPLE));
+	sptr->b_s_open = TRUE;
+      }
+      sptr->mem_buffer = alloc_sarray(cinfo, JPOOL_IMAGE,
+				      sptr->samplesperrow, sptr->rows_in_mem);
+      sptr->rowsperchunk = mem->last_rowsperchunk;
+      sptr->cur_start_row = 0;
+      sptr->first_undef_row = 0;
+      sptr->dirty = FALSE;
+    }
+  }
+
+  for (bptr = mem->virt_barray_list; bptr != NULL; bptr = bptr->next) {
+    if (bptr->mem_buffer == NULL) { /* if not realized yet */
+      minheights = ((long) bptr->rows_in_array - 1L) / bptr->maxaccess + 1L;
+      if (minheights <= max_minheights) {
+	/* This buffer fits in memory */
+	bptr->rows_in_mem = bptr->rows_in_array;
+      } else {
+	/* It doesn't fit in memory, create backing store. */
+	bptr->rows_in_mem = (JDIMENSION) (max_minheights * bptr->maxaccess);
+	jpeg_open_backing_store(cinfo, & bptr->b_s_info,
+				(long) bptr->rows_in_array *
+				(long) bptr->blocksperrow *
+				(long) SIZEOF(JBLOCK));
+	bptr->b_s_open = TRUE;
+      }
+      bptr->mem_buffer = alloc_barray(cinfo, JPOOL_IMAGE,
+				      bptr->blocksperrow, bptr->rows_in_mem);
+      bptr->rowsperchunk = mem->last_rowsperchunk;
+      bptr->cur_start_row = 0;
+      bptr->first_undef_row = 0;
+      bptr->dirty = FALSE;
+    }
+  }
+}
+
+
+LOCAL(void)
+do_sarray_io (j_common_ptr cinfo, jvirt_sarray_ptr ptr, boolean writing)
+/* Do backing store read or write of a virtual sample array */
+{
+  long bytesperrow, file_offset, byte_count, rows, thisrow, i;
+
+  bytesperrow = (long) ptr->samplesperrow * SIZEOF(JSAMPLE);
+  file_offset = ptr->cur_start_row * bytesperrow;
+  /* Loop to read or write each allocation chunk in mem_buffer */
+  for (i = 0; i < (long) ptr->rows_in_mem; i += ptr->rowsperchunk) {
+    /* One chunk, but check for short chunk at end of buffer */
+    rows = MIN((long) ptr->rowsperchunk, (long) ptr->rows_in_mem - i);
+    /* Transfer no more than is currently defined */
+    thisrow = (long) ptr->cur_start_row + i;
+    rows = MIN(rows, (long) ptr->first_undef_row - thisrow);
+    /* Transfer no more than fits in file */
+    rows = MIN(rows, (long) ptr->rows_in_array - thisrow);
+    if (rows <= 0)		/* this chunk might be past end of file! */
+      break;
+    byte_count = rows * bytesperrow;
+    if (writing)
+      (*ptr->b_s_info.write_backing_store) (cinfo, & ptr->b_s_info,
+					    (void FAR *) ptr->mem_buffer[i],
+					    file_offset, byte_count);
+    else
+      (*ptr->b_s_info.read_backing_store) (cinfo, & ptr->b_s_info,
+					   (void FAR *) ptr->mem_buffer[i],
+					   file_offset, byte_count);
+    file_offset += byte_count;
+  }
+}
+
+
+LOCAL(void)
+do_barray_io (j_common_ptr cinfo, jvirt_barray_ptr ptr, boolean writing)
+/* Do backing store read or write of a virtual coefficient-block array */
+{
+  long bytesperrow, file_offset, byte_count, rows, thisrow, i;
+
+  bytesperrow = (long) ptr->blocksperrow * SIZEOF(JBLOCK);
+  file_offset = ptr->cur_start_row * bytesperrow;
+  /* Loop to read or write each allocation chunk in mem_buffer */
+  for (i = 0; i < (long) ptr->rows_in_mem; i += ptr->rowsperchunk) {
+    /* One chunk, but check for short chunk at end of buffer */
+    rows = MIN((long) ptr->rowsperchunk, (long) ptr->rows_in_mem - i);
+    /* Transfer no more than is currently defined */
+    thisrow = (long) ptr->cur_start_row + i;
+    rows = MIN(rows, (long) ptr->first_undef_row - thisrow);
+    /* Transfer no more than fits in file */
+    rows = MIN(rows, (long) ptr->rows_in_array - thisrow);
+    if (rows <= 0)		/* this chunk might be past end of file! */
+      break;
+    byte_count = rows * bytesperrow;
+    if (writing)
+      (*ptr->b_s_info.write_backing_store) (cinfo, & ptr->b_s_info,
+					    (void FAR *) ptr->mem_buffer[i],
+					    file_offset, byte_count);
+    else
+      (*ptr->b_s_info.read_backing_store) (cinfo, & ptr->b_s_info,
+					   (void FAR *) ptr->mem_buffer[i],
+					   file_offset, byte_count);
+    file_offset += byte_count;
+  }
+}
+
+
+METHODDEF(JSAMPARRAY)
+access_virt_sarray (j_common_ptr cinfo, jvirt_sarray_ptr ptr,
+		    JDIMENSION start_row, JDIMENSION num_rows,
+		    boolean writable)
+/* Access the part of a virtual sample array starting at start_row */
+/* and extending for num_rows rows.  writable is true if  */
+/* caller intends to modify the accessed area. */
+{
+  JDIMENSION end_row = start_row + num_rows;
+  JDIMENSION undef_row;
+
+  /* debugging check */
+  if (end_row > ptr->rows_in_array || num_rows > ptr->maxaccess ||
+      ptr->mem_buffer == NULL)
+    ERREXIT(cinfo, JERR_BAD_VIRTUAL_ACCESS);
+
+  /* Make the desired part of the virtual array accessible */
+  if (start_row < ptr->cur_start_row ||
+      end_row > ptr->cur_start_row+ptr->rows_in_mem) {
+    if (! ptr->b_s_open)
+      ERREXIT(cinfo, JERR_VIRTUAL_BUG);
+    /* Flush old buffer contents if necessary */
+    if (ptr->dirty) {
+      do_sarray_io(cinfo, ptr, TRUE);
+      ptr->dirty = FALSE;
+    }
+    /* Decide what part of virtual array to access.
+     * Algorithm: if target address > current window, assume forward scan,
+     * load starting at target address.  If target address < current window,
+     * assume backward scan, load so that target area is top of window.
+     * Note that when switching from forward write to forward read, will have
+     * start_row = 0, so the limiting case applies and we load from 0 anyway.
+     */
+    if (start_row > ptr->cur_start_row) {
+      ptr->cur_start_row = start_row;
+    } else {
+      /* use long arithmetic here to avoid overflow & unsigned problems */
+      long ltemp;
+
+      ltemp = (long) end_row - (long) ptr->rows_in_mem;
+      if (ltemp < 0)
+	ltemp = 0;		/* don't fall off front end of file */
+      ptr->cur_start_row = (JDIMENSION) ltemp;
+    }
+    /* Read in the selected part of the array.
+     * During the initial write pass, we will do no actual read
+     * because the selected part is all undefined.
+     */
+    do_sarray_io(cinfo, ptr, FALSE);
+  }
+  /* Ensure the accessed part of the array is defined; prezero if needed.
+   * To improve locality of access, we only prezero the part of the array
+   * that the caller is about to access, not the entire in-memory array.
+   */
+  if (ptr->first_undef_row < end_row) {
+    if (ptr->first_undef_row < start_row) {
+      if (writable)		/* writer skipped over a section of array */
+	ERREXIT(cinfo, JERR_BAD_VIRTUAL_ACCESS);
+      undef_row = start_row;	/* but reader is allowed to read ahead */
+    } else {
+      undef_row = ptr->first_undef_row;
+    }
+    if (writable)
+      ptr->first_undef_row = end_row;
+    if (ptr->pre_zero) {
+      size_t bytesperrow = (size_t) ptr->samplesperrow * SIZEOF(JSAMPLE);
+      undef_row -= ptr->cur_start_row; /* make indexes relative to buffer */
+      end_row -= ptr->cur_start_row;
+      while (undef_row < end_row) {
+	jzero_far((void FAR *) ptr->mem_buffer[undef_row], bytesperrow);
+	undef_row++;
+      }
+    } else {
+      if (! writable)		/* reader looking at undefined data */
+	ERREXIT(cinfo, JERR_BAD_VIRTUAL_ACCESS);
+    }
+  }
+  /* Flag the buffer dirty if caller will write in it */
+  if (writable)
+    ptr->dirty = TRUE;
+  /* Return address of proper part of the buffer */
+  return ptr->mem_buffer + (start_row - ptr->cur_start_row);
+}
+
+
+METHODDEF(JBLOCKARRAY)
+access_virt_barray (j_common_ptr cinfo, jvirt_barray_ptr ptr,
+		    JDIMENSION start_row, JDIMENSION num_rows,
+		    boolean writable)
+/* Access the part of a virtual block array starting at start_row */
+/* and extending for num_rows rows.  writable is true if  */
+/* caller intends to modify the accessed area. */
+{
+  JDIMENSION end_row = start_row + num_rows;
+  JDIMENSION undef_row;
+
+  /* debugging check */
+  if (end_row > ptr->rows_in_array || num_rows > ptr->maxaccess ||
+      ptr->mem_buffer == NULL)
+    ERREXIT(cinfo, JERR_BAD_VIRTUAL_ACCESS);
+
+  /* Make the desired part of the virtual array accessible */
+  if (start_row < ptr->cur_start_row ||
+      end_row > ptr->cur_start_row+ptr->rows_in_mem) {
+    if (! ptr->b_s_open)
+      ERREXIT(cinfo, JERR_VIRTUAL_BUG);
+    /* Flush old buffer contents if necessary */
+    if (ptr->dirty) {
+      do_barray_io(cinfo, ptr, TRUE);
+      ptr->dirty = FALSE;
+    }
+    /* Decide what part of virtual array to access.
+     * Algorithm: if target address > current window, assume forward scan,
+     * load starting at target address.  If target address < current window,
+     * assume backward scan, load so that target area is top of window.
+     * Note that when switching from forward write to forward read, will have
+     * start_row = 0, so the limiting case applies and we load from 0 anyway.
+     */
+    if (start_row > ptr->cur_start_row) {
+      ptr->cur_start_row = start_row;
+    } else {
+      /* use long arithmetic here to avoid overflow & unsigned problems */
+      long ltemp;
+
+      ltemp = (long) end_row - (long) ptr->rows_in_mem;
+      if (ltemp < 0)
+	ltemp = 0;		/* don't fall off front end of file */
+      ptr->cur_start_row = (JDIMENSION) ltemp;
+    }
+    /* Read in the selected part of the array.
+     * During the initial write pass, we will do no actual read
+     * because the selected part is all undefined.
+     */
+    do_barray_io(cinfo, ptr, FALSE);
+  }
+  /* Ensure the accessed part of the array is defined; prezero if needed.
+   * To improve locality of access, we only prezero the part of the array
+   * that the caller is about to access, not the entire in-memory array.
+   */
+  if (ptr->first_undef_row < end_row) {
+    if (ptr->first_undef_row < start_row) {
+      if (writable)		/* writer skipped over a section of array */
+	ERREXIT(cinfo, JERR_BAD_VIRTUAL_ACCESS);
+      undef_row = start_row;	/* but reader is allowed to read ahead */
+    } else {
+      undef_row = ptr->first_undef_row;
+    }
+    if (writable)
+      ptr->first_undef_row = end_row;
+    if (ptr->pre_zero) {
+      size_t bytesperrow = (size_t) ptr->blocksperrow * SIZEOF(JBLOCK);
+      undef_row -= ptr->cur_start_row; /* make indexes relative to buffer */
+      end_row -= ptr->cur_start_row;
+      while (undef_row < end_row) {
+	jzero_far((void FAR *) ptr->mem_buffer[undef_row], bytesperrow);
+	undef_row++;
+      }
+    } else {
+      if (! writable)		/* reader looking at undefined data */
+	ERREXIT(cinfo, JERR_BAD_VIRTUAL_ACCESS);
+    }
+  }
+  /* Flag the buffer dirty if caller will write in it */
+  if (writable)
+    ptr->dirty = TRUE;
+  /* Return address of proper part of the buffer */
+  return ptr->mem_buffer + (start_row - ptr->cur_start_row);
+}
+
+
+/*
+ * Release all objects belonging to a specified pool.
+ */
+
+METHODDEF(void)
+free_pool (j_common_ptr cinfo, int pool_id)
+{
+  my_mem_ptr mem = (my_mem_ptr) cinfo->mem;
+  small_pool_ptr shdr_ptr;
+  large_pool_ptr lhdr_ptr;
+  size_t space_freed;
+
+  if (pool_id < 0 || pool_id >= JPOOL_NUMPOOLS)
+    ERREXIT1(cinfo, JERR_BAD_POOL_ID, pool_id);	/* safety check */
+
+#ifdef MEM_STATS
+  if (cinfo->err->trace_level > 1)
+    print_mem_stats(cinfo, pool_id); /* print pool's memory usage statistics */
+#endif
+
+  /* If freeing IMAGE pool, close any virtual arrays first */
+  if (pool_id == JPOOL_IMAGE) {
+    jvirt_sarray_ptr sptr;
+    jvirt_barray_ptr bptr;
+
+    for (sptr = mem->virt_sarray_list; sptr != NULL; sptr = sptr->next) {
+      if (sptr->b_s_open) {	/* there may be no backing store */
+	sptr->b_s_open = FALSE;	/* prevent recursive close if error */
+	(*sptr->b_s_info.close_backing_store) (cinfo, & sptr->b_s_info);
+      }
+    }
+    mem->virt_sarray_list = NULL;
+    for (bptr = mem->virt_barray_list; bptr != NULL; bptr = bptr->next) {
+      if (bptr->b_s_open) {	/* there may be no backing store */
+	bptr->b_s_open = FALSE;	/* prevent recursive close if error */
+	(*bptr->b_s_info.close_backing_store) (cinfo, & bptr->b_s_info);
+      }
+    }
+    mem->virt_barray_list = NULL;
+  }
+
+  /* Release large objects */
+  lhdr_ptr = mem->large_list[pool_id];
+  mem->large_list[pool_id] = NULL;
+
+  while (lhdr_ptr != NULL) {
+    large_pool_ptr next_lhdr_ptr = lhdr_ptr->next;
+    space_freed = lhdr_ptr->bytes_used +
+		  lhdr_ptr->bytes_left +
+		  SIZEOF(large_pool_hdr);
+    jpeg_free_large(cinfo, (void FAR *) lhdr_ptr, space_freed);
+    mem->total_space_allocated -= space_freed;
+    lhdr_ptr = next_lhdr_ptr;
+  }
+
+  /* Release small objects */
+  shdr_ptr = mem->small_list[pool_id];
+  mem->small_list[pool_id] = NULL;
+
+  while (shdr_ptr != NULL) {
+    small_pool_ptr next_shdr_ptr = shdr_ptr->next;
+    space_freed = shdr_ptr->bytes_used +
+		  shdr_ptr->bytes_left +
+		  SIZEOF(small_pool_hdr);
+    jpeg_free_small(cinfo, (void *) shdr_ptr, space_freed);
+    mem->total_space_allocated -= space_freed;
+    shdr_ptr = next_shdr_ptr;
+  }
+}
+
+
+/*
+ * Close up shop entirely.
+ * Note that this cannot be called unless cinfo->mem is non-NULL.
+ */
+
+METHODDEF(void)
+self_destruct (j_common_ptr cinfo)
+{
+  int pool;
+
+  /* Close all backing store, release all memory.
+   * Releasing pools in reverse order might help avoid fragmentation
+   * with some (brain-damaged) malloc libraries.
+   */
+  for (pool = JPOOL_NUMPOOLS-1; pool >= JPOOL_PERMANENT; pool--) {
+    free_pool(cinfo, pool);
+  }
+
+  /* Release the memory manager control block too. */
+  jpeg_free_small(cinfo, (void *) cinfo->mem, SIZEOF(my_memory_mgr));
+  cinfo->mem = NULL;		/* ensures I will be called only once */
+
+  jpeg_mem_term(cinfo);		/* system-dependent cleanup */
+}
+
+
+/*
+ * Memory manager initialization.
+ * When this is called, only the error manager pointer is valid in cinfo!
+ */
+
+GLOBAL(void)
+jinit_memory_mgr (j_common_ptr cinfo)
+{
+  my_mem_ptr mem;
+  long max_to_use;
+  int pool;
+  size_t test_mac;
+
+  cinfo->mem = NULL;		/* for safety if init fails */
+
+  /* Check for configuration errors.
+   * SIZEOF(ALIGN_TYPE) should be a power of 2; otherwise, it probably
+   * doesn't reflect any real hardware alignment requirement.
+   * The test is a little tricky: for X>0, X and X-1 have no one-bits
+   * in common if and only if X is a power of 2, ie has only one one-bit.
+   * Some compilers may give an "unreachable code" warning here; ignore it.
+   */
+  if ((ALIGN_SIZE & (ALIGN_SIZE-1)) != 0)
+    ERREXIT(cinfo, JERR_BAD_ALIGN_TYPE);
+  /* MAX_ALLOC_CHUNK must be representable as type size_t, and must be
+   * a multiple of ALIGN_SIZE.
+   * Again, an "unreachable code" warning may be ignored here.
+   * But a "constant too large" warning means you need to fix MAX_ALLOC_CHUNK.
+   */
+  test_mac = (size_t) MAX_ALLOC_CHUNK;
+  if ((long) test_mac != MAX_ALLOC_CHUNK ||
+      (MAX_ALLOC_CHUNK % ALIGN_SIZE) != 0)
+    ERREXIT(cinfo, JERR_BAD_ALLOC_CHUNK);
+
+  max_to_use = jpeg_mem_init(cinfo); /* system-dependent initialization */
+
+  /* Attempt to allocate memory manager's control block */
+  mem = (my_mem_ptr) jpeg_get_small(cinfo, SIZEOF(my_memory_mgr));
+
+  if (mem == NULL) {
+    jpeg_mem_term(cinfo);	/* system-dependent cleanup */
+    ERREXIT1(cinfo, JERR_OUT_OF_MEMORY, 0);
+  }
+
+  /* OK, fill in the method pointers */
+  mem->pub.alloc_small = alloc_small;
+  mem->pub.alloc_large = alloc_large;
+  mem->pub.alloc_sarray = alloc_sarray;
+  mem->pub.alloc_barray = alloc_barray;
+  mem->pub.request_virt_sarray = request_virt_sarray;
+  mem->pub.request_virt_barray = request_virt_barray;
+  mem->pub.realize_virt_arrays = realize_virt_arrays;
+  mem->pub.access_virt_sarray = access_virt_sarray;
+  mem->pub.access_virt_barray = access_virt_barray;
+  mem->pub.free_pool = free_pool;
+  mem->pub.self_destruct = self_destruct;
+
+  /* Make MAX_ALLOC_CHUNK accessible to other modules */
+  mem->pub.max_alloc_chunk = MAX_ALLOC_CHUNK;
+
+  /* Initialize working state */
+  mem->pub.max_memory_to_use = max_to_use;
+
+  for (pool = JPOOL_NUMPOOLS-1; pool >= JPOOL_PERMANENT; pool--) {
+    mem->small_list[pool] = NULL;
+    mem->large_list[pool] = NULL;
+  }
+  mem->virt_sarray_list = NULL;
+  mem->virt_barray_list = NULL;
+
+  mem->total_space_allocated = SIZEOF(my_memory_mgr);
+
+  /* Declare ourselves open for business */
+  cinfo->mem = & mem->pub;
+
+  /* Check for an environment variable JPEGMEM; if found, override the
+   * default max_memory setting from jpeg_mem_init.  Note that the
+   * surrounding application may again override this value.
+   * If your system doesn't support getenv(), define NO_GETENV to disable
+   * this feature.
+   */
+#ifndef NO_GETENV
+  { char * memenv;
+
+    if ((memenv = getenv("JPEGMEM")) != NULL) {
+      char ch = 'x';
+
+      if (sscanf(memenv, "%ld%c", &max_to_use, &ch) > 0) {
+	if (ch == 'm' || ch == 'M')
+	  max_to_use *= 1000L;
+	mem->pub.max_memory_to_use = max_to_use * 1000L;
+      }
+    }
+  }
+#endif
+
+}
diff --git a/src/libjpeg-turbo/jmemnobs.c b/src/libjpeg-turbo/jmemnobs.c
new file mode 100644
index 0000000..34b1895
--- /dev/null
+++ b/src/libjpeg-turbo/jmemnobs.c
@@ -0,0 +1,109 @@
+/*
+ * jmemnobs.c
+ *
+ * Copyright (C) 1992-1996, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file provides a really simple implementation of the system-
+ * dependent portion of the JPEG memory manager.  This implementation
+ * assumes that no backing-store files are needed: all required space
+ * can be obtained from malloc().
+ * This is very portable in the sense that it'll compile on almost anything,
+ * but you'd better have lots of main memory (or virtual memory) if you want
+ * to process big images.
+ * Note that the max_memory_to_use option is ignored by this implementation.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jmemsys.h"		/* import the system-dependent declarations */
+
+#ifndef HAVE_STDLIB_H		/* <stdlib.h> should declare malloc(),free() */
+extern void * malloc JPP((size_t size));
+extern void free JPP((void *ptr));
+#endif
+
+
+/*
+ * Memory allocation and freeing are controlled by the regular library
+ * routines malloc() and free().
+ */
+
+GLOBAL(void *)
+jpeg_get_small (j_common_ptr cinfo, size_t sizeofobject)
+{
+  return (void *) malloc(sizeofobject);
+}
+
+GLOBAL(void)
+jpeg_free_small (j_common_ptr cinfo, void * object, size_t sizeofobject)
+{
+  free(object);
+}
+
+
+/*
+ * "Large" objects are treated the same as "small" ones.
+ * NB: although we include FAR keywords in the routine declarations,
+ * this file won't actually work in 80x86 small/medium model; at least,
+ * you probably won't be able to process useful-size images in only 64KB.
+ */
+
+GLOBAL(void FAR *)
+jpeg_get_large (j_common_ptr cinfo, size_t sizeofobject)
+{
+  return (void FAR *) malloc(sizeofobject);
+}
+
+GLOBAL(void)
+jpeg_free_large (j_common_ptr cinfo, void FAR * object, size_t sizeofobject)
+{
+  free(object);
+}
+
+
+/*
+ * This routine computes the total memory space available for allocation.
+ * Here we always say, "we got all you want bud!"
+ */
+
+GLOBAL(size_t)
+jpeg_mem_available (j_common_ptr cinfo, size_t min_bytes_needed,
+		    size_t max_bytes_needed, size_t already_allocated)
+{
+  return max_bytes_needed;
+}
+
+
+/*
+ * Backing store (temporary file) management.
+ * Since jpeg_mem_available always promised the moon,
+ * this should never be called and we can just error out.
+ */
+
+GLOBAL(void)
+jpeg_open_backing_store (j_common_ptr cinfo, backing_store_ptr info,
+			 long total_bytes_needed)
+{
+  ERREXIT(cinfo, JERR_NO_BACKING_STORE);
+}
+
+
+/*
+ * These routines take care of any system-dependent initialization and
+ * cleanup required.  Here, there isn't any.
+ */
+
+GLOBAL(long)
+jpeg_mem_init (j_common_ptr cinfo)
+{
+  return 0;			/* just set max_memory_to_use to 0 */
+}
+
+GLOBAL(void)
+jpeg_mem_term (j_common_ptr cinfo)
+{
+  /* no work */
+}
diff --git a/src/libjpeg-turbo/jmemsys.h b/src/libjpeg-turbo/jmemsys.h
new file mode 100644
index 0000000..b190945
--- /dev/null
+++ b/src/libjpeg-turbo/jmemsys.h
@@ -0,0 +1,198 @@
+/*
+ * jmemsys.h
+ *
+ * Copyright (C) 1992-1997, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This include file defines the interface between the system-independent
+ * and system-dependent portions of the JPEG memory manager.  No other
+ * modules need include it.  (The system-independent portion is jmemmgr.c;
+ * there are several different versions of the system-dependent portion.)
+ *
+ * This file works as-is for the system-dependent memory managers supplied
+ * in the IJG distribution.  You may need to modify it if you write a
+ * custom memory manager.  If system-dependent changes are needed in
+ * this file, the best method is to #ifdef them based on a configuration
+ * symbol supplied in jconfig.h, as we have done with USE_MSDOS_MEMMGR
+ * and USE_MAC_MEMMGR.
+ */
+
+
+/* Short forms of external names for systems with brain-damaged linkers. */
+
+#ifdef NEED_SHORT_EXTERNAL_NAMES
+#define jpeg_get_small		jGetSmall
+#define jpeg_free_small		jFreeSmall
+#define jpeg_get_large		jGetLarge
+#define jpeg_free_large		jFreeLarge
+#define jpeg_mem_available	jMemAvail
+#define jpeg_open_backing_store	jOpenBackStore
+#define jpeg_mem_init		jMemInit
+#define jpeg_mem_term		jMemTerm
+#endif /* NEED_SHORT_EXTERNAL_NAMES */
+
+
+/*
+ * These two functions are used to allocate and release small chunks of
+ * memory.  (Typically the total amount requested through jpeg_get_small is
+ * no more than 20K or so; this will be requested in chunks of a few K each.)
+ * Behavior should be the same as for the standard library functions malloc
+ * and free; in particular, jpeg_get_small must return NULL on failure.
+ * On most systems, these ARE malloc and free.  jpeg_free_small is passed the
+ * size of the object being freed, just in case it's needed.
+ * On an 80x86 machine using small-data memory model, these manage near heap.
+ */
+
+EXTERN(void *) jpeg_get_small JPP((j_common_ptr cinfo, size_t sizeofobject));
+EXTERN(void) jpeg_free_small JPP((j_common_ptr cinfo, void * object,
+				  size_t sizeofobject));
+
+/*
+ * These two functions are used to allocate and release large chunks of
+ * memory (up to the total free space designated by jpeg_mem_available).
+ * The interface is the same as above, except that on an 80x86 machine,
+ * far pointers are used.  On most other machines these are identical to
+ * the jpeg_get/free_small routines; but we keep them separate anyway,
+ * in case a different allocation strategy is desirable for large chunks.
+ */
+
+EXTERN(void FAR *) jpeg_get_large JPP((j_common_ptr cinfo,
+				       size_t sizeofobject));
+EXTERN(void) jpeg_free_large JPP((j_common_ptr cinfo, void FAR * object,
+				  size_t sizeofobject));
+
+/*
+ * The macro MAX_ALLOC_CHUNK designates the maximum number of bytes that may
+ * be requested in a single call to jpeg_get_large (and jpeg_get_small for that
+ * matter, but that case should never come into play).  This macro is needed
+ * to model the 64Kb-segment-size limit of far addressing on 80x86 machines.
+ * On those machines, we expect that jconfig.h will provide a proper value.
+ * On machines with 32-bit flat address spaces, any large constant may be used.
+ *
+ * NB: jmemmgr.c expects that MAX_ALLOC_CHUNK will be representable as type
+ * size_t and will be a multiple of sizeof(align_type).
+ */
+
+#ifndef MAX_ALLOC_CHUNK		/* may be overridden in jconfig.h */
+#define MAX_ALLOC_CHUNK  1000000000L
+#endif
+
+/*
+ * This routine computes the total space still available for allocation by
+ * jpeg_get_large.  If more space than this is needed, backing store will be
+ * used.  NOTE: any memory already allocated must not be counted.
+ *
+ * There is a minimum space requirement, corresponding to the minimum
+ * feasible buffer sizes; jmemmgr.c will request that much space even if
+ * jpeg_mem_available returns zero.  The maximum space needed, enough to hold
+ * all working storage in memory, is also passed in case it is useful.
+ * Finally, the total space already allocated is passed.  If no better
+ * method is available, cinfo->mem->max_memory_to_use - already_allocated
+ * is often a suitable calculation.
+ *
+ * It is OK for jpeg_mem_available to underestimate the space available
+ * (that'll just lead to more backing-store access than is really necessary).
+ * However, an overestimate will lead to failure.  Hence it's wise to subtract
+ * a slop factor from the true available space.  5% should be enough.
+ *
+ * On machines with lots of virtual memory, any large constant may be returned.
+ * Conversely, zero may be returned to always use the minimum amount of memory.
+ */
+
+EXTERN(size_t) jpeg_mem_available JPP((j_common_ptr cinfo,
+				     size_t min_bytes_needed,
+				     size_t max_bytes_needed,
+				     size_t already_allocated));
+
+
+/*
+ * This structure holds whatever state is needed to access a single
+ * backing-store object.  The read/write/close method pointers are called
+ * by jmemmgr.c to manipulate the backing-store object; all other fields
+ * are private to the system-dependent backing store routines.
+ */
+
+#define TEMP_NAME_LENGTH   64	/* max length of a temporary file's name */
+
+
+#ifdef USE_MSDOS_MEMMGR		/* DOS-specific junk */
+
+typedef unsigned short XMSH;	/* type of extended-memory handles */
+typedef unsigned short EMSH;	/* type of expanded-memory handles */
+
+typedef union {
+  short file_handle;		/* DOS file handle if it's a temp file */
+  XMSH xms_handle;		/* handle if it's a chunk of XMS */
+  EMSH ems_handle;		/* handle if it's a chunk of EMS */
+} handle_union;
+
+#endif /* USE_MSDOS_MEMMGR */
+
+#ifdef USE_MAC_MEMMGR		/* Mac-specific junk */
+#include <Files.h>
+#endif /* USE_MAC_MEMMGR */
+
+
+typedef struct backing_store_struct * backing_store_ptr;
+
+typedef struct backing_store_struct {
+  /* Methods for reading/writing/closing this backing-store object */
+  JMETHOD(void, read_backing_store, (j_common_ptr cinfo,
+				     backing_store_ptr info,
+				     void FAR * buffer_address,
+				     long file_offset, long byte_count));
+  JMETHOD(void, write_backing_store, (j_common_ptr cinfo,
+				      backing_store_ptr info,
+				      void FAR * buffer_address,
+				      long file_offset, long byte_count));
+  JMETHOD(void, close_backing_store, (j_common_ptr cinfo,
+				      backing_store_ptr info));
+
+  /* Private fields for system-dependent backing-store management */
+#ifdef USE_MSDOS_MEMMGR
+  /* For the MS-DOS manager (jmemdos.c), we need: */
+  handle_union handle;		/* reference to backing-store storage object */
+  char temp_name[TEMP_NAME_LENGTH]; /* name if it's a file */
+#else
+#ifdef USE_MAC_MEMMGR
+  /* For the Mac manager (jmemmac.c), we need: */
+  short temp_file;		/* file reference number to temp file */
+  FSSpec tempSpec;		/* the FSSpec for the temp file */
+  char temp_name[TEMP_NAME_LENGTH]; /* name if it's a file */
+#else
+  /* For a typical implementation with temp files, we need: */
+  FILE * temp_file;		/* stdio reference to temp file */
+  char temp_name[TEMP_NAME_LENGTH]; /* name of temp file */
+#endif
+#endif
+} backing_store_info;
+
+
+/*
+ * Initial opening of a backing-store object.  This must fill in the
+ * read/write/close pointers in the object.  The read/write routines
+ * may take an error exit if the specified maximum file size is exceeded.
+ * (If jpeg_mem_available always returns a large value, this routine can
+ * just take an error exit.)
+ */
+
+EXTERN(void) jpeg_open_backing_store JPP((j_common_ptr cinfo,
+					  backing_store_ptr info,
+					  long total_bytes_needed));
+
+
+/*
+ * These routines take care of any system-dependent initialization and
+ * cleanup required.  jpeg_mem_init will be called before anything is
+ * allocated (and, therefore, nothing in cinfo is of use except the error
+ * manager pointer).  It should return a suitable default value for
+ * max_memory_to_use; this may subsequently be overridden by the surrounding
+ * application.  (Note that max_memory_to_use is only important if
+ * jpeg_mem_available chooses to consult it ... no one else will.)
+ * jpeg_mem_term may assume that all requested memory has been freed and that
+ * all opened backing-store objects have been closed.
+ */
+
+EXTERN(long) jpeg_mem_init JPP((j_common_ptr cinfo));
+EXTERN(void) jpeg_mem_term JPP((j_common_ptr cinfo));
diff --git a/src/libjpeg-turbo/jmorecfg.h b/src/libjpeg-turbo/jmorecfg.h
new file mode 100644
index 0000000..f22c4f3
--- /dev/null
+++ b/src/libjpeg-turbo/jmorecfg.h
@@ -0,0 +1,404 @@
+/*
+ * jmorecfg.h
+ *
+ * Copyright (C) 1991-1997, Thomas G. Lane.
+ * Copyright (C) 2009, 2011, D. R. Commander.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains additional configuration options that customize the
+ * JPEG software for special applications or support machine-dependent
+ * optimizations.  Most users will not need to touch this file.
+ */
+
+
+/*
+ * Define BITS_IN_JSAMPLE as either
+ *   8   for 8-bit sample values (the usual setting)
+ *   12  for 12-bit sample values
+ * Only 8 and 12 are legal data precisions for lossy JPEG according to the
+ * JPEG standard, and the IJG code does not support anything else!
+ * We do not support run-time selection of data precision, sorry.
+ */
+
+#define BITS_IN_JSAMPLE  8	/* use 8 or 12 */
+
+
+/*
+ * Maximum number of components (color channels) allowed in JPEG image.
+ * To meet the letter of the JPEG spec, set this to 255.  However, darn
+ * few applications need more than 4 channels (maybe 5 for CMYK + alpha
+ * mask).  We recommend 10 as a reasonable compromise; use 4 if you are
+ * really short on memory.  (Each allowed component costs a hundred or so
+ * bytes of storage, whether actually used in an image or not.)
+ */
+
+#define MAX_COMPONENTS  10	/* maximum number of image components */
+
+
+/*
+ * Basic data types.
+ * You may need to change these if you have a machine with unusual data
+ * type sizes; for example, "char" not 8 bits, "short" not 16 bits,
+ * or "long" not 32 bits.  We don't care whether "int" is 16 or 32 bits,
+ * but it had better be at least 16.
+ */
+
+/* Representation of a single sample (pixel element value).
+ * We frequently allocate large arrays of these, so it's important to keep
+ * them small.  But if you have memory to burn and access to char or short
+ * arrays is very slow on your hardware, you might want to change these.
+ */
+
+#if BITS_IN_JSAMPLE == 8
+/* JSAMPLE should be the smallest type that will hold the values 0..255.
+ * You can use a signed char by having GETJSAMPLE mask it with 0xFF.
+ */
+
+#ifdef HAVE_UNSIGNED_CHAR
+
+typedef unsigned char JSAMPLE;
+#define GETJSAMPLE(value)  ((int) (value))
+
+#else /* not HAVE_UNSIGNED_CHAR */
+
+typedef char JSAMPLE;
+#ifdef __CHAR_UNSIGNED__
+#define GETJSAMPLE(value)  ((int) (value))
+#else
+#define GETJSAMPLE(value)  ((int) (value) & 0xFF)
+#endif /* __CHAR_UNSIGNED__ */
+
+#endif /* HAVE_UNSIGNED_CHAR */
+
+#define MAXJSAMPLE	255
+#define CENTERJSAMPLE	128
+
+#endif /* BITS_IN_JSAMPLE == 8 */
+
+
+#if BITS_IN_JSAMPLE == 12
+/* JSAMPLE should be the smallest type that will hold the values 0..4095.
+ * On nearly all machines "short" will do nicely.
+ */
+
+typedef short JSAMPLE;
+#define GETJSAMPLE(value)  ((int) (value))
+
+#define MAXJSAMPLE	4095
+#define CENTERJSAMPLE	2048
+
+#endif /* BITS_IN_JSAMPLE == 12 */
+
+
+/* Representation of a DCT frequency coefficient.
+ * This should be a signed value of at least 16 bits; "short" is usually OK.
+ * Again, we allocate large arrays of these, but you can change to int
+ * if you have memory to burn and "short" is really slow.
+ */
+
+typedef short JCOEF;
+
+
+/* Compressed datastreams are represented as arrays of JOCTET.
+ * These must be EXACTLY 8 bits wide, at least once they are written to
+ * external storage.  Note that when using the stdio data source/destination
+ * managers, this is also the data type passed to fread/fwrite.
+ */
+
+#ifdef HAVE_UNSIGNED_CHAR
+
+typedef unsigned char JOCTET;
+#define GETJOCTET(value)  (value)
+
+#else /* not HAVE_UNSIGNED_CHAR */
+
+typedef char JOCTET;
+#ifdef __CHAR_UNSIGNED__
+#define GETJOCTET(value)  (value)
+#else
+#define GETJOCTET(value)  ((value) & 0xFF)
+#endif /* __CHAR_UNSIGNED__ */
+
+#endif /* HAVE_UNSIGNED_CHAR */
+
+
+/* These typedefs are used for various table entries and so forth.
+ * They must be at least as wide as specified; but making them too big
+ * won't cost a huge amount of memory, so we don't provide special
+ * extraction code like we did for JSAMPLE.  (In other words, these
+ * typedefs live at a different point on the speed/space tradeoff curve.)
+ */
+
+/* UINT8 must hold at least the values 0..255. */
+
+#ifdef HAVE_UNSIGNED_CHAR
+typedef unsigned char UINT8;
+#else /* not HAVE_UNSIGNED_CHAR */
+#ifdef __CHAR_UNSIGNED__
+typedef char UINT8;
+#else /* not __CHAR_UNSIGNED__ */
+typedef short UINT8;
+#endif /* __CHAR_UNSIGNED__ */
+#endif /* HAVE_UNSIGNED_CHAR */
+
+/* UINT16 must hold at least the values 0..65535. */
+
+#ifdef HAVE_UNSIGNED_SHORT
+typedef unsigned short UINT16;
+#else /* not HAVE_UNSIGNED_SHORT */
+typedef unsigned int UINT16;
+#endif /* HAVE_UNSIGNED_SHORT */
+
+/* INT16 must hold at least the values -32768..32767. */
+
+#ifndef XMD_H			/* X11/xmd.h correctly defines INT16 */
+typedef short INT16;
+#endif
+
+/* INT32 must hold at least signed 32-bit values. */
+
+#ifndef XMD_H			/* X11/xmd.h correctly defines INT32 */
+typedef long INT32;
+#endif
+
+/* Datatype used for image dimensions.  The JPEG standard only supports
+ * images up to 64K*64K due to 16-bit fields in SOF markers.  Therefore
+ * "unsigned int" is sufficient on all machines.  However, if you need to
+ * handle larger images and you don't mind deviating from the spec, you
+ * can change this datatype.
+ */
+
+typedef unsigned int JDIMENSION;
+
+#define JPEG_MAX_DIMENSION  65500L  /* a tad under 64K to prevent overflows */
+
+
+/* These macros are used in all function definitions and extern declarations.
+ * You could modify them if you need to change function linkage conventions;
+ * in particular, you'll need to do that to make the library a Windows DLL.
+ * Another application is to make all functions global for use with debuggers
+ * or code profilers that require it.
+ */
+
+/* a function called through method pointers: */
+#define METHODDEF(type)		static type
+/* a function used only in its module: */
+#define LOCAL(type)		static type
+/* a function referenced thru EXTERNs: */
+#define GLOBAL(type)		type
+/* a reference to a GLOBAL function: */
+#define EXTERN(type)		extern type
+
+
+/* This macro is used to declare a "method", that is, a function pointer.
+ * We want to supply prototype parameters if the compiler can cope.
+ * Note that the arglist parameter must be parenthesized!
+ * Again, you can customize this if you need special linkage keywords.
+ */
+
+#ifdef HAVE_PROTOTYPES
+#define JMETHOD(type,methodname,arglist)  type (*methodname) arglist
+#else
+#define JMETHOD(type,methodname,arglist)  type (*methodname) ()
+#endif
+
+
+/* Here is the pseudo-keyword for declaring pointers that must be "far"
+ * on 80x86 machines.  Most of the specialized coding for 80x86 is handled
+ * by just saying "FAR *" where such a pointer is needed.  In a few places
+ * explicit coding is needed; see uses of the NEED_FAR_POINTERS symbol.
+ */
+
+#ifdef NEED_FAR_POINTERS
+#define FAR  far
+#else
+#define FAR
+#endif
+
+
+/*
+ * On a few systems, type boolean and/or its values FALSE, TRUE may appear
+ * in standard header files.  Or you may have conflicts with application-
+ * specific header files that you want to include together with these files.
+ * Defining HAVE_BOOLEAN before including jpeglib.h should make it work.
+ */
+
+#ifndef HAVE_BOOLEAN
+typedef int boolean;
+#endif
+#ifndef FALSE			/* in case these macros already exist */
+#define FALSE	0		/* values of boolean */
+#endif
+#ifndef TRUE
+#define TRUE	1
+#endif
+
+
+/*
+ * The remaining options affect code selection within the JPEG library,
+ * but they don't need to be visible to most applications using the library.
+ * To minimize application namespace pollution, the symbols won't be
+ * defined unless JPEG_INTERNALS or JPEG_INTERNAL_OPTIONS has been defined.
+ */
+
+#ifdef JPEG_INTERNALS
+#define JPEG_INTERNAL_OPTIONS
+#endif
+
+#ifdef JPEG_INTERNAL_OPTIONS
+
+
+/*
+ * These defines indicate whether to include various optional functions.
+ * Undefining some of these symbols will produce a smaller but less capable
+ * library.  Note that you can leave certain source files out of the
+ * compilation/linking process if you've #undef'd the corresponding symbols.
+ * (You may HAVE to do that if your compiler doesn't like null source files.)
+ */
+
+/* Capability options common to encoder and decoder: */
+
+#define DCT_ISLOW_SUPPORTED	/* slow but accurate integer algorithm */
+#define DCT_IFAST_SUPPORTED	/* faster, less accurate integer method */
+#define DCT_FLOAT_SUPPORTED	/* floating-point: accurate, fast on fast HW */
+
+/* Encoder capability options: */
+
+#define C_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
+#define C_PROGRESSIVE_SUPPORTED	    /* Progressive JPEG? (Requires MULTISCAN)*/
+#define ENTROPY_OPT_SUPPORTED	    /* Optimization of entropy coding parms? */
+/* Note: if you selected 12-bit data precision, it is dangerous to turn off
+ * ENTROPY_OPT_SUPPORTED.  The standard Huffman tables are only good for 8-bit
+ * precision, so jchuff.c normally uses entropy optimization to compute
+ * usable tables for higher precision.  If you don't want to do optimization,
+ * you'll have to supply different default Huffman tables.
+ * The exact same statements apply for progressive JPEG: the default tables
+ * don't work for progressive mode.  (This may get fixed, however.)
+ */
+#define INPUT_SMOOTHING_SUPPORTED   /* Input image smoothing option? */
+
+/* Decoder capability options: */
+
+#define D_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
+#define D_PROGRESSIVE_SUPPORTED	    /* Progressive JPEG? (Requires MULTISCAN)*/
+#define SAVE_MARKERS_SUPPORTED	    /* jpeg_save_markers() needed? */
+#define BLOCK_SMOOTHING_SUPPORTED   /* Block smoothing? (Progressive only) */
+#define IDCT_SCALING_SUPPORTED	    /* Output rescaling via IDCT? */
+#undef  UPSAMPLE_SCALING_SUPPORTED  /* Output rescaling at upsample stage? */
+#define UPSAMPLE_MERGING_SUPPORTED  /* Fast path for sloppy upsampling? */
+#define QUANT_1PASS_SUPPORTED	    /* 1-pass color quantization? */
+#define QUANT_2PASS_SUPPORTED	    /* 2-pass color quantization? */
+
+/* more capability options later, no doubt */
+
+
+/*
+ * Ordering of RGB data in scanlines passed to or from the application.
+ * If your application wants to deal with data in the order B,G,R, just
+ * change these macros.  You can also deal with formats such as R,G,B,X
+ * (one extra byte per pixel) by changing RGB_PIXELSIZE.  Note that changing
+ * the offsets will also change the order in which colormap data is organized.
+ * RESTRICTIONS:
+ * 1. The sample applications cjpeg,djpeg do NOT support modified RGB formats.
+ * 2. These macros only affect RGB<=>YCbCr color conversion, so they are not
+ *    useful if you are using JPEG color spaces other than YCbCr or grayscale.
+ * 3. The color quantizer modules will not behave desirably if RGB_PIXELSIZE
+ *    is not 3 (they don't understand about dummy color components!).  So you
+ *    can't use color quantization if you change that value.
+ */
+
+#define RGB_RED		0	/* Offset of Red in an RGB scanline element */
+#define RGB_GREEN	1	/* Offset of Green */
+#define RGB_BLUE	2	/* Offset of Blue */
+#define RGB_PIXELSIZE	3	/* JSAMPLEs per RGB scanline element */
+
+#define JPEG_NUMCS 16
+
+#define EXT_RGB_RED        0
+#define EXT_RGB_GREEN      1
+#define EXT_RGB_BLUE       2
+#define EXT_RGB_PIXELSIZE  3
+
+#define EXT_RGBX_RED       0
+#define EXT_RGBX_GREEN     1
+#define EXT_RGBX_BLUE      2
+#define EXT_RGBX_PIXELSIZE 4
+
+#define EXT_BGR_RED        2
+#define EXT_BGR_GREEN      1
+#define EXT_BGR_BLUE       0
+#define EXT_BGR_PIXELSIZE  3
+
+#define EXT_BGRX_RED       2
+#define EXT_BGRX_GREEN     1
+#define EXT_BGRX_BLUE      0
+#define EXT_BGRX_PIXELSIZE 4
+
+#define EXT_XBGR_RED       3
+#define EXT_XBGR_GREEN     2
+#define EXT_XBGR_BLUE      1
+#define EXT_XBGR_PIXELSIZE 4
+
+#define EXT_XRGB_RED       1
+#define EXT_XRGB_GREEN     2
+#define EXT_XRGB_BLUE      3
+#define EXT_XRGB_PIXELSIZE 4
+
+static const int rgb_red[JPEG_NUMCS] = {
+  -1, -1, RGB_RED, -1, -1, -1, EXT_RGB_RED, EXT_RGBX_RED,
+  EXT_BGR_RED, EXT_BGRX_RED, EXT_XBGR_RED, EXT_XRGB_RED,
+  EXT_RGBX_RED, EXT_BGRX_RED, EXT_XBGR_RED, EXT_XRGB_RED
+};
+
+static const int rgb_green[JPEG_NUMCS] = {
+  -1, -1, RGB_GREEN, -1, -1, -1, EXT_RGB_GREEN, EXT_RGBX_GREEN,
+  EXT_BGR_GREEN, EXT_BGRX_GREEN, EXT_XBGR_GREEN, EXT_XRGB_GREEN,
+  EXT_RGBX_GREEN, EXT_BGRX_GREEN, EXT_XBGR_GREEN, EXT_XRGB_GREEN
+};
+
+static const int rgb_blue[JPEG_NUMCS] = {
+  -1, -1, RGB_BLUE, -1, -1, -1, EXT_RGB_BLUE, EXT_RGBX_BLUE,
+  EXT_BGR_BLUE, EXT_BGRX_BLUE, EXT_XBGR_BLUE, EXT_XRGB_BLUE,
+  EXT_RGBX_BLUE, EXT_BGRX_BLUE, EXT_XBGR_BLUE, EXT_XRGB_BLUE
+};
+
+static const int rgb_pixelsize[JPEG_NUMCS] = {
+  -1, -1, RGB_PIXELSIZE, -1, -1, -1, EXT_RGB_PIXELSIZE, EXT_RGBX_PIXELSIZE,
+  EXT_BGR_PIXELSIZE, EXT_BGRX_PIXELSIZE, EXT_XBGR_PIXELSIZE, EXT_XRGB_PIXELSIZE,
+  EXT_RGBX_PIXELSIZE, EXT_BGRX_PIXELSIZE, EXT_XBGR_PIXELSIZE, EXT_XRGB_PIXELSIZE
+};
+
+/* Definitions for speed-related optimizations. */
+
+/* On some machines (notably 68000 series) "int" is 32 bits, but multiplying
+ * two 16-bit shorts is faster than multiplying two ints.  Define MULTIPLIER
+ * as short on such a machine.  MULTIPLIER must be at least 16 bits wide.
+ */
+
+#ifndef MULTIPLIER
+#ifndef WITH_SIMD
+#define MULTIPLIER  int		/* type for fastest integer multiply */
+#else
+#define MULTIPLIER short  /* prefer 16-bit with SIMD for parellelism */
+#endif
+#endif
+
+
+/* FAST_FLOAT should be either float or double, whichever is done faster
+ * by your compiler.  (Note that this type is only used in the floating point
+ * DCT routines, so it only matters if you've defined DCT_FLOAT_SUPPORTED.)
+ * Typically, float is faster in ANSI C compilers, while double is faster in
+ * pre-ANSI compilers (because they insist on converting to double anyway).
+ * The code below therefore chooses float if we have ANSI-style prototypes.
+ */
+
+#ifndef FAST_FLOAT
+#ifdef HAVE_PROTOTYPES
+#define FAST_FLOAT  float
+#else
+#define FAST_FLOAT  double
+#endif
+#endif
+
+#endif /* JPEG_INTERNAL_OPTIONS */
diff --git a/src/libjpeg-turbo/jpegcomp.h b/src/libjpeg-turbo/jpegcomp.h
new file mode 100644
index 0000000..1b9e0a4
--- /dev/null
+++ b/src/libjpeg-turbo/jpegcomp.h
@@ -0,0 +1,26 @@
+/*
+ * jpegcomp.h
+ *
+ * Copyright (C) 2010, D. R. Commander
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * JPEG compatibility macros
+ * These declarations are considered internal to the JPEG library; most
+ * applications using the library shouldn't need to include this file.
+ */
+
+#if JPEG_LIB_VERSION >= 70
+#define _DCT_scaled_size DCT_h_scaled_size
+#define _min_DCT_scaled_size min_DCT_h_scaled_size
+#define _min_DCT_h_scaled_size min_DCT_h_scaled_size
+#define _min_DCT_v_scaled_size min_DCT_v_scaled_size
+#define _jpeg_width jpeg_width
+#define _jpeg_height jpeg_height
+#else
+#define _DCT_scaled_size DCT_scaled_size
+#define _min_DCT_scaled_size min_DCT_scaled_size
+#define _min_DCT_h_scaled_size min_DCT_scaled_size
+#define _min_DCT_v_scaled_size min_DCT_scaled_size
+#define _jpeg_width image_width
+#define _jpeg_height image_height
+#endif
diff --git a/src/libjpeg-turbo/jpegint.h b/src/libjpeg-turbo/jpegint.h
new file mode 100644
index 0000000..7871748
--- /dev/null
+++ b/src/libjpeg-turbo/jpegint.h
@@ -0,0 +1,401 @@
+/*
+ * jpegint.h
+ *
+ * Copyright (C) 1991-1997, Thomas G. Lane.
+ * Modified 1997-2009 by Guido Vollbeding.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file provides common declarations for the various JPEG modules.
+ * These declarations are considered internal to the JPEG library; most
+ * applications using the library shouldn't need to include this file.
+ */
+
+
+/* Declarations for both compression & decompression */
+
+typedef enum {			/* Operating modes for buffer controllers */
+	JBUF_PASS_THRU,		/* Plain stripwise operation */
+	/* Remaining modes require a full-image buffer to have been created */
+	JBUF_SAVE_SOURCE,	/* Run source subobject only, save output */
+	JBUF_CRANK_DEST,	/* Run dest subobject only, using saved data */
+	JBUF_SAVE_AND_PASS	/* Run both subobjects, save output */
+} J_BUF_MODE;
+
+/* Values of global_state field (jdapi.c has some dependencies on ordering!) */
+#define CSTATE_START	100	/* after create_compress */
+#define CSTATE_SCANNING	101	/* start_compress done, write_scanlines OK */
+#define CSTATE_RAW_OK	102	/* start_compress done, write_raw_data OK */
+#define CSTATE_WRCOEFS	103	/* jpeg_write_coefficients done */
+#define DSTATE_START	200	/* after create_decompress */
+#define DSTATE_INHEADER	201	/* reading header markers, no SOS yet */
+#define DSTATE_READY	202	/* found SOS, ready for start_decompress */
+#define DSTATE_PRELOAD	203	/* reading multiscan file in start_decompress*/
+#define DSTATE_PRESCAN	204	/* performing dummy pass for 2-pass quant */
+#define DSTATE_SCANNING	205	/* start_decompress done, read_scanlines OK */
+#define DSTATE_RAW_OK	206	/* start_decompress done, read_raw_data OK */
+#define DSTATE_BUFIMAGE	207	/* expecting jpeg_start_output */
+#define DSTATE_BUFPOST	208	/* looking for SOS/EOI in jpeg_finish_output */
+#define DSTATE_RDCOEFS	209	/* reading file in jpeg_read_coefficients */
+#define DSTATE_STOPPING	210	/* looking for EOI in jpeg_finish_decompress */
+
+
+/* Declarations for compression modules */
+
+/* Master control module */
+struct jpeg_comp_master {
+  JMETHOD(void, prepare_for_pass, (j_compress_ptr cinfo));
+  JMETHOD(void, pass_startup, (j_compress_ptr cinfo));
+  JMETHOD(void, finish_pass, (j_compress_ptr cinfo));
+
+  /* State variables made visible to other modules */
+  boolean call_pass_startup;	/* True if pass_startup must be called */
+  boolean is_last_pass;		/* True during last pass */
+};
+
+/* Main buffer control (downsampled-data buffer) */
+struct jpeg_c_main_controller {
+  JMETHOD(void, start_pass, (j_compress_ptr cinfo, J_BUF_MODE pass_mode));
+  JMETHOD(void, process_data, (j_compress_ptr cinfo,
+			       JSAMPARRAY input_buf, JDIMENSION *in_row_ctr,
+			       JDIMENSION in_rows_avail));
+};
+
+/* Compression preprocessing (downsampling input buffer control) */
+struct jpeg_c_prep_controller {
+  JMETHOD(void, start_pass, (j_compress_ptr cinfo, J_BUF_MODE pass_mode));
+  JMETHOD(void, pre_process_data, (j_compress_ptr cinfo,
+				   JSAMPARRAY input_buf,
+				   JDIMENSION *in_row_ctr,
+				   JDIMENSION in_rows_avail,
+				   JSAMPIMAGE output_buf,
+				   JDIMENSION *out_row_group_ctr,
+				   JDIMENSION out_row_groups_avail));
+};
+
+/* Coefficient buffer control */
+struct jpeg_c_coef_controller {
+  JMETHOD(void, start_pass, (j_compress_ptr cinfo, J_BUF_MODE pass_mode));
+  JMETHOD(boolean, compress_data, (j_compress_ptr cinfo,
+				   JSAMPIMAGE input_buf));
+};
+
+/* Colorspace conversion */
+struct jpeg_color_converter {
+  JMETHOD(void, start_pass, (j_compress_ptr cinfo));
+  JMETHOD(void, color_convert, (j_compress_ptr cinfo,
+				JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+				JDIMENSION output_row, int num_rows));
+};
+
+/* Downsampling */
+struct jpeg_downsampler {
+  JMETHOD(void, start_pass, (j_compress_ptr cinfo));
+  JMETHOD(void, downsample, (j_compress_ptr cinfo,
+			     JSAMPIMAGE input_buf, JDIMENSION in_row_index,
+			     JSAMPIMAGE output_buf,
+			     JDIMENSION out_row_group_index));
+
+  boolean need_context_rows;	/* TRUE if need rows above & below */
+};
+
+/* Forward DCT (also controls coefficient quantization) */
+struct jpeg_forward_dct {
+  JMETHOD(void, start_pass, (j_compress_ptr cinfo));
+  /* perhaps this should be an array??? */
+  JMETHOD(void, forward_DCT, (j_compress_ptr cinfo,
+			      jpeg_component_info * compptr,
+			      JSAMPARRAY sample_data, JBLOCKROW coef_blocks,
+			      JDIMENSION start_row, JDIMENSION start_col,
+			      JDIMENSION num_blocks));
+};
+
+/* Entropy encoding */
+struct jpeg_entropy_encoder {
+  JMETHOD(void, start_pass, (j_compress_ptr cinfo, boolean gather_statistics));
+  JMETHOD(boolean, encode_mcu, (j_compress_ptr cinfo, JBLOCKROW *MCU_data));
+  JMETHOD(void, finish_pass, (j_compress_ptr cinfo));
+};
+
+/* Marker writing */
+struct jpeg_marker_writer {
+  JMETHOD(void, write_file_header, (j_compress_ptr cinfo));
+  JMETHOD(void, write_frame_header, (j_compress_ptr cinfo));
+  JMETHOD(void, write_scan_header, (j_compress_ptr cinfo));
+  JMETHOD(void, write_file_trailer, (j_compress_ptr cinfo));
+  JMETHOD(void, write_tables_only, (j_compress_ptr cinfo));
+  /* These routines are exported to allow insertion of extra markers */
+  /* Probably only COM and APPn markers should be written this way */
+  JMETHOD(void, write_marker_header, (j_compress_ptr cinfo, int marker,
+				      unsigned int datalen));
+  JMETHOD(void, write_marker_byte, (j_compress_ptr cinfo, int val));
+};
+
+
+/* Declarations for decompression modules */
+
+/* Master control module */
+struct jpeg_decomp_master {
+  JMETHOD(void, prepare_for_output_pass, (j_decompress_ptr cinfo));
+  JMETHOD(void, finish_output_pass, (j_decompress_ptr cinfo));
+
+  /* State variables made visible to other modules */
+  boolean is_dummy_pass;	/* True during 1st pass for 2-pass quant */
+};
+
+/* Input control module */
+struct jpeg_input_controller {
+  JMETHOD(int, consume_input, (j_decompress_ptr cinfo));
+  JMETHOD(void, reset_input_controller, (j_decompress_ptr cinfo));
+  JMETHOD(void, start_input_pass, (j_decompress_ptr cinfo));
+  JMETHOD(void, finish_input_pass, (j_decompress_ptr cinfo));
+
+  /* State variables made visible to other modules */
+  boolean has_multiple_scans;	/* True if file has multiple scans */
+  boolean eoi_reached;		/* True when EOI has been consumed */
+};
+
+/* Main buffer control (downsampled-data buffer) */
+struct jpeg_d_main_controller {
+  JMETHOD(void, start_pass, (j_decompress_ptr cinfo, J_BUF_MODE pass_mode));
+  JMETHOD(void, process_data, (j_decompress_ptr cinfo,
+			       JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
+			       JDIMENSION out_rows_avail));
+};
+
+/* Coefficient buffer control */
+struct jpeg_d_coef_controller {
+  JMETHOD(void, start_input_pass, (j_decompress_ptr cinfo));
+  JMETHOD(int, consume_data, (j_decompress_ptr cinfo));
+  JMETHOD(void, start_output_pass, (j_decompress_ptr cinfo));
+  JMETHOD(int, decompress_data, (j_decompress_ptr cinfo,
+				 JSAMPIMAGE output_buf));
+  /* Pointer to array of coefficient virtual arrays, or NULL if none */
+  jvirt_barray_ptr *coef_arrays;
+};
+
+/* Decompression postprocessing (color quantization buffer control) */
+struct jpeg_d_post_controller {
+  JMETHOD(void, start_pass, (j_decompress_ptr cinfo, J_BUF_MODE pass_mode));
+  JMETHOD(void, post_process_data, (j_decompress_ptr cinfo,
+				    JSAMPIMAGE input_buf,
+				    JDIMENSION *in_row_group_ctr,
+				    JDIMENSION in_row_groups_avail,
+				    JSAMPARRAY output_buf,
+				    JDIMENSION *out_row_ctr,
+				    JDIMENSION out_rows_avail));
+};
+
+/* Marker reading & parsing */
+struct jpeg_marker_reader {
+  JMETHOD(void, reset_marker_reader, (j_decompress_ptr cinfo));
+  /* Read markers until SOS or EOI.
+   * Returns same codes as are defined for jpeg_consume_input:
+   * JPEG_SUSPENDED, JPEG_REACHED_SOS, or JPEG_REACHED_EOI.
+   */
+  JMETHOD(int, read_markers, (j_decompress_ptr cinfo));
+  /* Read a restart marker --- exported for use by entropy decoder only */
+  jpeg_marker_parser_method read_restart_marker;
+
+  /* State of marker reader --- nominally internal, but applications
+   * supplying COM or APPn handlers might like to know the state.
+   */
+  boolean saw_SOI;		/* found SOI? */
+  boolean saw_SOF;		/* found SOF? */
+  int next_restart_num;		/* next restart number expected (0-7) */
+  unsigned int discarded_bytes;	/* # of bytes skipped looking for a marker */
+};
+
+/* Entropy decoding */
+struct jpeg_entropy_decoder {
+  JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
+  JMETHOD(boolean, decode_mcu, (j_decompress_ptr cinfo,
+				JBLOCKROW *MCU_data));
+
+  /* This is here to share code between baseline and progressive decoders; */
+  /* other modules probably should not use it */
+  boolean insufficient_data;	/* set TRUE after emitting warning */
+};
+
+/* Inverse DCT (also performs dequantization) */
+typedef JMETHOD(void, inverse_DCT_method_ptr,
+		(j_decompress_ptr cinfo, jpeg_component_info * compptr,
+		 JCOEFPTR coef_block,
+		 JSAMPARRAY output_buf, JDIMENSION output_col));
+
+struct jpeg_inverse_dct {
+  JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
+  /* It is useful to allow each component to have a separate IDCT method. */
+  inverse_DCT_method_ptr inverse_DCT[MAX_COMPONENTS];
+};
+
+/* Upsampling (note that upsampler must also call color converter) */
+struct jpeg_upsampler {
+  JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
+  JMETHOD(void, upsample, (j_decompress_ptr cinfo,
+			   JSAMPIMAGE input_buf,
+			   JDIMENSION *in_row_group_ctr,
+			   JDIMENSION in_row_groups_avail,
+			   JSAMPARRAY output_buf,
+			   JDIMENSION *out_row_ctr,
+			   JDIMENSION out_rows_avail));
+
+  boolean need_context_rows;	/* TRUE if need rows above & below */
+};
+
+/* Colorspace conversion */
+struct jpeg_color_deconverter {
+  JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
+  JMETHOD(void, color_convert, (j_decompress_ptr cinfo,
+				JSAMPIMAGE input_buf, JDIMENSION input_row,
+				JSAMPARRAY output_buf, int num_rows));
+};
+
+/* Color quantization or color precision reduction */
+struct jpeg_color_quantizer {
+  JMETHOD(void, start_pass, (j_decompress_ptr cinfo, boolean is_pre_scan));
+  JMETHOD(void, color_quantize, (j_decompress_ptr cinfo,
+				 JSAMPARRAY input_buf, JSAMPARRAY output_buf,
+				 int num_rows));
+  JMETHOD(void, finish_pass, (j_decompress_ptr cinfo));
+  JMETHOD(void, new_color_map, (j_decompress_ptr cinfo));
+};
+
+
+/* Miscellaneous useful macros */
+
+#undef MAX
+#define MAX(a,b)	((a) > (b) ? (a) : (b))
+#undef MIN
+#define MIN(a,b)	((a) < (b) ? (a) : (b))
+
+
+/* We assume that right shift corresponds to signed division by 2 with
+ * rounding towards minus infinity.  This is correct for typical "arithmetic
+ * shift" instructions that shift in copies of the sign bit.  But some
+ * C compilers implement >> with an unsigned shift.  For these machines you
+ * must define RIGHT_SHIFT_IS_UNSIGNED.
+ * RIGHT_SHIFT provides a proper signed right shift of an INT32 quantity.
+ * It is only applied with constant shift counts.  SHIFT_TEMPS must be
+ * included in the variables of any routine using RIGHT_SHIFT.
+ */
+
+#ifdef RIGHT_SHIFT_IS_UNSIGNED
+#define SHIFT_TEMPS	INT32 shift_temp;
+#define RIGHT_SHIFT(x,shft)  \
+	((shift_temp = (x)) < 0 ? \
+	 (shift_temp >> (shft)) | ((~((INT32) 0)) << (32-(shft))) : \
+	 (shift_temp >> (shft)))
+#else
+#define SHIFT_TEMPS
+#define RIGHT_SHIFT(x,shft)	((x) >> (shft))
+#endif
+
+
+/* Short forms of external names for systems with brain-damaged linkers. */
+
+#ifdef NEED_SHORT_EXTERNAL_NAMES
+#define jinit_compress_master	jICompress
+#define jinit_c_master_control	jICMaster
+#define jinit_c_main_controller	jICMainC
+#define jinit_c_prep_controller	jICPrepC
+#define jinit_c_coef_controller	jICCoefC
+#define jinit_color_converter	jICColor
+#define jinit_downsampler	jIDownsampler
+#define jinit_forward_dct	jIFDCT
+#define jinit_huff_encoder	jIHEncoder
+#define jinit_phuff_encoder	jIPHEncoder
+#define jinit_arith_encoder	jIAEncoder
+#define jinit_marker_writer	jIMWriter
+#define jinit_master_decompress	jIDMaster
+#define jinit_d_main_controller	jIDMainC
+#define jinit_d_coef_controller	jIDCoefC
+#define jinit_d_post_controller	jIDPostC
+#define jinit_input_controller	jIInCtlr
+#define jinit_marker_reader	jIMReader
+#define jinit_huff_decoder	jIHDecoder
+#define jinit_phuff_decoder	jIPHDecoder
+#define jinit_arith_decoder	jIADecoder
+#define jinit_inverse_dct	jIIDCT
+#define jinit_upsampler		jIUpsampler
+#define jinit_color_deconverter	jIDColor
+#define jinit_1pass_quantizer	jI1Quant
+#define jinit_2pass_quantizer	jI2Quant
+#define jinit_merged_upsampler	jIMUpsampler
+#define jinit_memory_mgr	jIMemMgr
+#define jdiv_round_up		jDivRound
+#define jround_up		jRound
+#define jcopy_sample_rows	jCopySamples
+#define jcopy_block_row		jCopyBlocks
+#define jzero_far		jZeroFar
+#define jpeg_zigzag_order	jZIGTable
+#define jpeg_natural_order	jZAGTable
+#define jpeg_aritab		jAriTab
+#endif /* NEED_SHORT_EXTERNAL_NAMES */
+
+
+/* Compression module initialization routines */
+EXTERN(void) jinit_compress_master JPP((j_compress_ptr cinfo));
+EXTERN(void) jinit_c_master_control JPP((j_compress_ptr cinfo,
+					 boolean transcode_only));
+EXTERN(void) jinit_c_main_controller JPP((j_compress_ptr cinfo,
+					  boolean need_full_buffer));
+EXTERN(void) jinit_c_prep_controller JPP((j_compress_ptr cinfo,
+					  boolean need_full_buffer));
+EXTERN(void) jinit_c_coef_controller JPP((j_compress_ptr cinfo,
+					  boolean need_full_buffer));
+EXTERN(void) jinit_color_converter JPP((j_compress_ptr cinfo));
+EXTERN(void) jinit_downsampler JPP((j_compress_ptr cinfo));
+EXTERN(void) jinit_forward_dct JPP((j_compress_ptr cinfo));
+EXTERN(void) jinit_huff_encoder JPP((j_compress_ptr cinfo));
+EXTERN(void) jinit_phuff_encoder JPP((j_compress_ptr cinfo));
+EXTERN(void) jinit_arith_encoder JPP((j_compress_ptr cinfo));
+EXTERN(void) jinit_marker_writer JPP((j_compress_ptr cinfo));
+/* Decompression module initialization routines */
+EXTERN(void) jinit_master_decompress JPP((j_decompress_ptr cinfo));
+EXTERN(void) jinit_d_main_controller JPP((j_decompress_ptr cinfo,
+					  boolean need_full_buffer));
+EXTERN(void) jinit_d_coef_controller JPP((j_decompress_ptr cinfo,
+					  boolean need_full_buffer));
+EXTERN(void) jinit_d_post_controller JPP((j_decompress_ptr cinfo,
+					  boolean need_full_buffer));
+EXTERN(void) jinit_input_controller JPP((j_decompress_ptr cinfo));
+EXTERN(void) jinit_marker_reader JPP((j_decompress_ptr cinfo));
+EXTERN(void) jinit_huff_decoder JPP((j_decompress_ptr cinfo));
+EXTERN(void) jinit_phuff_decoder JPP((j_decompress_ptr cinfo));
+EXTERN(void) jinit_arith_decoder JPP((j_decompress_ptr cinfo));
+EXTERN(void) jinit_inverse_dct JPP((j_decompress_ptr cinfo));
+EXTERN(void) jinit_upsampler JPP((j_decompress_ptr cinfo));
+EXTERN(void) jinit_color_deconverter JPP((j_decompress_ptr cinfo));
+EXTERN(void) jinit_1pass_quantizer JPP((j_decompress_ptr cinfo));
+EXTERN(void) jinit_2pass_quantizer JPP((j_decompress_ptr cinfo));
+EXTERN(void) jinit_merged_upsampler JPP((j_decompress_ptr cinfo));
+/* Memory manager initialization */
+EXTERN(void) jinit_memory_mgr JPP((j_common_ptr cinfo));
+
+/* Utility routines in jutils.c */
+EXTERN(long) jdiv_round_up JPP((long a, long b));
+EXTERN(long) jround_up JPP((long a, long b));
+EXTERN(void) jcopy_sample_rows JPP((JSAMPARRAY input_array, int source_row,
+				    JSAMPARRAY output_array, int dest_row,
+				    int num_rows, JDIMENSION num_cols));
+EXTERN(void) jcopy_block_row JPP((JBLOCKROW input_row, JBLOCKROW output_row,
+				  JDIMENSION num_blocks));
+EXTERN(void) jzero_far JPP((void FAR * target, size_t bytestozero));
+/* Constant tables in jutils.c */
+#if 0				/* This table is not actually needed in v6a */
+extern const int jpeg_zigzag_order[]; /* natural coef order to zigzag order */
+#endif
+extern const int jpeg_natural_order[]; /* zigzag coef order to natural order */
+
+/* Arithmetic coding probability estimation tables in jaricom.c */
+extern const INT32 jpeg_aritab[];
+
+/* Suppress undefined-structure complaints if necessary. */
+
+#ifdef INCOMPLETE_TYPES_BROKEN
+#ifndef AM_MEMORY_MANAGER	/* only jmemmgr.c defines these */
+struct jvirt_sarray_control { long dummy; };
+struct jvirt_barray_control { long dummy; };
+#endif
+#endif /* INCOMPLETE_TYPES_BROKEN */
diff --git a/src/libjpeg-turbo/jpeglib.h b/src/libjpeg-turbo/jpeglib.h
new file mode 100644
index 0000000..d19a3ef
--- /dev/null
+++ b/src/libjpeg-turbo/jpeglib.h
@@ -0,0 +1,1213 @@
+/*
+ * jpeglib.h
+ *
+ * Copyright (C) 1991-1998, Thomas G. Lane.
+ * Modified 2002-2009 by Guido Vollbeding.
+ * Copyright (C) 2009-2011, D. R. Commander.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file defines the application interface for the JPEG library.
+ * Most applications using the library need only include this file,
+ * and perhaps jerror.h if they want to know the exact error codes.
+ */
+
+#ifndef JPEGLIB_H
+#define JPEGLIB_H
+
+/*
+ * First we include the configuration files that record how this
+ * installation of the JPEG library is set up.  jconfig.h can be
+ * generated automatically for many systems.  jmorecfg.h contains
+ * manual configuration options that most people need not worry about.
+ */
+
+#ifndef JCONFIG_INCLUDED	/* in case jinclude.h already did */
+#include "jconfig.h"		/* widely used configuration options */
+#endif
+#include "jmorecfg.h"		/* seldom changed options */
+
+
+#ifdef __cplusplus
+#ifndef DONT_USE_EXTERN_C
+extern "C" {
+#endif
+#endif
+
+
+/* Various constants determining the sizes of things.
+ * All of these are specified by the JPEG standard, so don't change them
+ * if you want to be compatible.
+ */
+
+#define DCTSIZE		    8	/* The basic DCT block is 8x8 samples */
+#define DCTSIZE2	    64	/* DCTSIZE squared; # of elements in a block */
+#define NUM_QUANT_TBLS      4	/* Quantization tables are numbered 0..3 */
+#define NUM_HUFF_TBLS       4	/* Huffman tables are numbered 0..3 */
+#define NUM_ARITH_TBLS      16	/* Arith-coding tables are numbered 0..15 */
+#define MAX_COMPS_IN_SCAN   4	/* JPEG limit on # of components in one scan */
+#define MAX_SAMP_FACTOR     4	/* JPEG limit on sampling factors */
+/* Unfortunately, some bozo at Adobe saw no reason to be bound by the standard;
+ * the PostScript DCT filter can emit files with many more than 10 blocks/MCU.
+ * If you happen to run across such a file, you can up D_MAX_BLOCKS_IN_MCU
+ * to handle it.  We even let you do this from the jconfig.h file.  However,
+ * we strongly discourage changing C_MAX_BLOCKS_IN_MCU; just because Adobe
+ * sometimes emits noncompliant files doesn't mean you should too.
+ */
+#define C_MAX_BLOCKS_IN_MCU   10 /* compressor's limit on blocks per MCU */
+#ifndef D_MAX_BLOCKS_IN_MCU
+#define D_MAX_BLOCKS_IN_MCU   10 /* decompressor's limit on blocks per MCU */
+#endif
+
+
+/* Data structures for images (arrays of samples and of DCT coefficients).
+ * On 80x86 machines, the image arrays are too big for near pointers,
+ * but the pointer arrays can fit in near memory.
+ */
+
+typedef JSAMPLE FAR *JSAMPROW;	/* ptr to one image row of pixel samples. */
+typedef JSAMPROW *JSAMPARRAY;	/* ptr to some rows (a 2-D sample array) */
+typedef JSAMPARRAY *JSAMPIMAGE;	/* a 3-D sample array: top index is color */
+
+typedef JCOEF JBLOCK[DCTSIZE2];	/* one block of coefficients */
+typedef JBLOCK FAR *JBLOCKROW;	/* pointer to one row of coefficient blocks */
+typedef JBLOCKROW *JBLOCKARRAY;		/* a 2-D array of coefficient blocks */
+typedef JBLOCKARRAY *JBLOCKIMAGE;	/* a 3-D array of coefficient blocks */
+
+typedef JCOEF FAR *JCOEFPTR;	/* useful in a couple of places */
+
+
+/* Types for JPEG compression parameters and working tables. */
+
+
+/* DCT coefficient quantization tables. */
+
+typedef struct {
+  /* This array gives the coefficient quantizers in natural array order
+   * (not the zigzag order in which they are stored in a JPEG DQT marker).
+   * CAUTION: IJG versions prior to v6a kept this array in zigzag order.
+   */
+  UINT16 quantval[DCTSIZE2];	/* quantization step for each coefficient */
+  /* This field is used only during compression.  It's initialized FALSE when
+   * the table is created, and set TRUE when it's been output to the file.
+   * You could suppress output of a table by setting this to TRUE.
+   * (See jpeg_suppress_tables for an example.)
+   */
+  boolean sent_table;		/* TRUE when table has been output */
+} JQUANT_TBL;
+
+
+/* Huffman coding tables. */
+
+typedef struct {
+  /* These two fields directly represent the contents of a JPEG DHT marker */
+  UINT8 bits[17];		/* bits[k] = # of symbols with codes of */
+				/* length k bits; bits[0] is unused */
+  UINT8 huffval[256];		/* The symbols, in order of incr code length */
+  /* This field is used only during compression.  It's initialized FALSE when
+   * the table is created, and set TRUE when it's been output to the file.
+   * You could suppress output of a table by setting this to TRUE.
+   * (See jpeg_suppress_tables for an example.)
+   */
+  boolean sent_table;		/* TRUE when table has been output */
+} JHUFF_TBL;
+
+
+/* Basic info about one component (color channel). */
+
+typedef struct {
+  /* These values are fixed over the whole image. */
+  /* For compression, they must be supplied by parameter setup; */
+  /* for decompression, they are read from the SOF marker. */
+  int component_id;		/* identifier for this component (0..255) */
+  int component_index;		/* its index in SOF or cinfo->comp_info[] */
+  int h_samp_factor;		/* horizontal sampling factor (1..4) */
+  int v_samp_factor;		/* vertical sampling factor (1..4) */
+  int quant_tbl_no;		/* quantization table selector (0..3) */
+  /* These values may vary between scans. */
+  /* For compression, they must be supplied by parameter setup; */
+  /* for decompression, they are read from the SOS marker. */
+  /* The decompressor output side may not use these variables. */
+  int dc_tbl_no;		/* DC entropy table selector (0..3) */
+  int ac_tbl_no;		/* AC entropy table selector (0..3) */
+  
+  /* Remaining fields should be treated as private by applications. */
+  
+  /* These values are computed during compression or decompression startup: */
+  /* Component's size in DCT blocks.
+   * Any dummy blocks added to complete an MCU are not counted; therefore
+   * these values do not depend on whether a scan is interleaved or not.
+   */
+  JDIMENSION width_in_blocks;
+  JDIMENSION height_in_blocks;
+  /* Size of a DCT block in samples.  Always DCTSIZE for compression.
+   * For decompression this is the size of the output from one DCT block,
+   * reflecting any scaling we choose to apply during the IDCT step.
+   * Values of 1,2,4,8 are likely to be supported.  Note that different
+   * components may receive different IDCT scalings.
+   */
+#if JPEG_LIB_VERSION >= 70
+  int DCT_h_scaled_size;
+  int DCT_v_scaled_size;
+#else
+  int DCT_scaled_size;
+#endif
+  /* The downsampled dimensions are the component's actual, unpadded number
+   * of samples at the main buffer (preprocessing/compression interface), thus
+   * downsampled_width = ceil(image_width * Hi/Hmax)
+   * and similarly for height.  For decompression, IDCT scaling is included, so
+   * downsampled_width = ceil(image_width * Hi/Hmax * DCT_[h_]scaled_size/DCTSIZE)
+   */
+  JDIMENSION downsampled_width;	 /* actual width in samples */
+  JDIMENSION downsampled_height; /* actual height in samples */
+  /* This flag is used only for decompression.  In cases where some of the
+   * components will be ignored (eg grayscale output from YCbCr image),
+   * we can skip most computations for the unused components.
+   */
+  boolean component_needed;	/* do we need the value of this component? */
+
+  /* These values are computed before starting a scan of the component. */
+  /* The decompressor output side may not use these variables. */
+  int MCU_width;		/* number of blocks per MCU, horizontally */
+  int MCU_height;		/* number of blocks per MCU, vertically */
+  int MCU_blocks;		/* MCU_width * MCU_height */
+  int MCU_sample_width;		/* MCU width in samples, MCU_width*DCT_[h_]scaled_size */
+  int last_col_width;		/* # of non-dummy blocks across in last MCU */
+  int last_row_height;		/* # of non-dummy blocks down in last MCU */
+
+  /* Saved quantization table for component; NULL if none yet saved.
+   * See jdinput.c comments about the need for this information.
+   * This field is currently used only for decompression.
+   */
+  JQUANT_TBL * quant_table;
+
+  /* Private per-component storage for DCT or IDCT subsystem. */
+  void * dct_table;
+} jpeg_component_info;
+
+
+/* The script for encoding a multiple-scan file is an array of these: */
+
+typedef struct {
+  int comps_in_scan;		/* number of components encoded in this scan */
+  int component_index[MAX_COMPS_IN_SCAN]; /* their SOF/comp_info[] indexes */
+  int Ss, Se;			/* progressive JPEG spectral selection parms */
+  int Ah, Al;			/* progressive JPEG successive approx. parms */
+} jpeg_scan_info;
+
+/* The decompressor can save APPn and COM markers in a list of these: */
+
+typedef struct jpeg_marker_struct FAR * jpeg_saved_marker_ptr;
+
+struct jpeg_marker_struct {
+  jpeg_saved_marker_ptr next;	/* next in list, or NULL */
+  UINT8 marker;			/* marker code: JPEG_COM, or JPEG_APP0+n */
+  unsigned int original_length;	/* # bytes of data in the file */
+  unsigned int data_length;	/* # bytes of data saved at data[] */
+  JOCTET FAR * data;		/* the data contained in the marker */
+  /* the marker length word is not counted in data_length or original_length */
+};
+
+/* Known color spaces. */
+
+#define JCS_EXTENSIONS 1
+#define JCS_ALPHA_EXTENSIONS 1
+
+typedef enum {
+	JCS_UNKNOWN,		/* error/unspecified */
+	JCS_GRAYSCALE,		/* monochrome */
+	JCS_RGB,		/* red/green/blue as specified by the RGB_RED, RGB_GREEN,
+				   RGB_BLUE, and RGB_PIXELSIZE macros */
+	JCS_YCbCr,		/* Y/Cb/Cr (also known as YUV) */
+	JCS_CMYK,		/* C/M/Y/K */
+	JCS_YCCK,		/* Y/Cb/Cr/K */
+	JCS_EXT_RGB,		/* red/green/blue */
+	JCS_EXT_RGBX,		/* red/green/blue/x */
+	JCS_EXT_BGR,		/* blue/green/red */
+	JCS_EXT_BGRX,		/* blue/green/red/x */
+	JCS_EXT_XBGR,		/* x/blue/green/red */
+	JCS_EXT_XRGB,		/* x/red/green/blue */
+	/* When out_color_space it set to JCS_EXT_RGBX, JCS_EXT_BGRX,
+	   JCS_EXT_XBGR, or JCS_EXT_XRGB during decompression, the X byte is
+	   undefined, and in order to ensure the best performance,
+	   libjpeg-turbo can set that byte to whatever value it wishes.  Use
+	   the following colorspace constants to ensure that the X byte is set
+	   to 0xFF, so that it can be interpreted as an opaque alpha
+	   channel. */
+	JCS_EXT_RGBA,		/* red/green/blue/alpha */
+	JCS_EXT_BGRA,		/* blue/green/red/alpha */
+	JCS_EXT_ABGR,		/* alpha/blue/green/red */
+	JCS_EXT_ARGB		/* alpha/red/green/blue */
+} J_COLOR_SPACE;
+
+/* DCT/IDCT algorithm options. */
+
+typedef enum {
+	JDCT_ISLOW,		/* slow but accurate integer algorithm */
+	JDCT_IFAST,		/* faster, less accurate integer method */
+	JDCT_FLOAT		/* floating-point: accurate, fast on fast HW */
+} J_DCT_METHOD;
+
+#ifndef JDCT_DEFAULT		/* may be overridden in jconfig.h */
+#define JDCT_DEFAULT  JDCT_ISLOW
+#endif
+#ifndef JDCT_FASTEST		/* may be overridden in jconfig.h */
+#define JDCT_FASTEST  JDCT_IFAST
+#endif
+
+/* Dithering options for decompression. */
+
+typedef enum {
+	JDITHER_NONE,		/* no dithering */
+	JDITHER_ORDERED,	/* simple ordered dither */
+	JDITHER_FS		/* Floyd-Steinberg error diffusion dither */
+} J_DITHER_MODE;
+
+
+/* Common fields between JPEG compression and decompression master structs. */
+
+#define jpeg_common_fields \
+  struct jpeg_error_mgr * err;	/* Error handler module */\
+  struct jpeg_memory_mgr * mem;	/* Memory manager module */\
+  struct jpeg_progress_mgr * progress; /* Progress monitor, or NULL if none */\
+  void * client_data;		/* Available for use by application */\
+  boolean is_decompressor;	/* So common code can tell which is which */\
+  int global_state		/* For checking call sequence validity */
+
+/* Routines that are to be used by both halves of the library are declared
+ * to receive a pointer to this structure.  There are no actual instances of
+ * jpeg_common_struct, only of jpeg_compress_struct and jpeg_decompress_struct.
+ */
+struct jpeg_common_struct {
+  jpeg_common_fields;		/* Fields common to both master struct types */
+  /* Additional fields follow in an actual jpeg_compress_struct or
+   * jpeg_decompress_struct.  All three structs must agree on these
+   * initial fields!  (This would be a lot cleaner in C++.)
+   */
+};
+
+typedef struct jpeg_common_struct * j_common_ptr;
+typedef struct jpeg_compress_struct * j_compress_ptr;
+typedef struct jpeg_decompress_struct * j_decompress_ptr;
+
+
+/* Master record for a compression instance */
+
+struct jpeg_compress_struct {
+  jpeg_common_fields;		/* Fields shared with jpeg_decompress_struct */
+
+  /* Destination for compressed data */
+  struct jpeg_destination_mgr * dest;
+
+  /* Description of source image --- these fields must be filled in by
+   * outer application before starting compression.  in_color_space must
+   * be correct before you can even call jpeg_set_defaults().
+   */
+
+  JDIMENSION image_width;	/* input image width */
+  JDIMENSION image_height;	/* input image height */
+  int input_components;		/* # of color components in input image */
+  J_COLOR_SPACE in_color_space;	/* colorspace of input image */
+
+  double input_gamma;		/* image gamma of input image */
+
+  /* Compression parameters --- these fields must be set before calling
+   * jpeg_start_compress().  We recommend calling jpeg_set_defaults() to
+   * initialize everything to reasonable defaults, then changing anything
+   * the application specifically wants to change.  That way you won't get
+   * burnt when new parameters are added.  Also note that there are several
+   * helper routines to simplify changing parameters.
+   */
+
+#if JPEG_LIB_VERSION >= 70
+  unsigned int scale_num, scale_denom; /* fraction by which to scale image */
+
+  JDIMENSION jpeg_width;	/* scaled JPEG image width */
+  JDIMENSION jpeg_height;	/* scaled JPEG image height */
+  /* Dimensions of actual JPEG image that will be written to file,
+   * derived from input dimensions by scaling factors above.
+   * These fields are computed by jpeg_start_compress().
+   * You can also use jpeg_calc_jpeg_dimensions() to determine these values
+   * in advance of calling jpeg_start_compress().
+   */
+#endif
+
+  int data_precision;		/* bits of precision in image data */
+
+  int num_components;		/* # of color components in JPEG image */
+  J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */
+
+  jpeg_component_info * comp_info;
+  /* comp_info[i] describes component that appears i'th in SOF */
+
+  JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS];
+#if JPEG_LIB_VERSION >= 70
+  int q_scale_factor[NUM_QUANT_TBLS];
+#endif
+  /* ptrs to coefficient quantization tables, or NULL if not defined,
+   * and corresponding scale factors (percentage, initialized 100).
+   */
+
+  JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
+  JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
+  /* ptrs to Huffman coding tables, or NULL if not defined */
+
+  UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */
+  UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */
+  UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */
+
+  int num_scans;		/* # of entries in scan_info array */
+  const jpeg_scan_info * scan_info; /* script for multi-scan file, or NULL */
+  /* The default value of scan_info is NULL, which causes a single-scan
+   * sequential JPEG file to be emitted.  To create a multi-scan file,
+   * set num_scans and scan_info to point to an array of scan definitions.
+   */
+
+  boolean raw_data_in;		/* TRUE=caller supplies downsampled data */
+  boolean arith_code;		/* TRUE=arithmetic coding, FALSE=Huffman */
+  boolean optimize_coding;	/* TRUE=optimize entropy encoding parms */
+  boolean CCIR601_sampling;	/* TRUE=first samples are cosited */
+#if JPEG_LIB_VERSION >= 70
+  boolean do_fancy_downsampling; /* TRUE=apply fancy downsampling */
+#endif
+  int smoothing_factor;		/* 1..100, or 0 for no input smoothing */
+  J_DCT_METHOD dct_method;	/* DCT algorithm selector */
+
+  /* The restart interval can be specified in absolute MCUs by setting
+   * restart_interval, or in MCU rows by setting restart_in_rows
+   * (in which case the correct restart_interval will be figured
+   * for each scan).
+   */
+  unsigned int restart_interval; /* MCUs per restart, or 0 for no restart */
+  int restart_in_rows;		/* if > 0, MCU rows per restart interval */
+
+  /* Parameters controlling emission of special markers. */
+
+  boolean write_JFIF_header;	/* should a JFIF marker be written? */
+  UINT8 JFIF_major_version;	/* What to write for the JFIF version number */
+  UINT8 JFIF_minor_version;
+  /* These three values are not used by the JPEG code, merely copied */
+  /* into the JFIF APP0 marker.  density_unit can be 0 for unknown, */
+  /* 1 for dots/inch, or 2 for dots/cm.  Note that the pixel aspect */
+  /* ratio is defined by X_density/Y_density even when density_unit=0. */
+  UINT8 density_unit;		/* JFIF code for pixel size units */
+  UINT16 X_density;		/* Horizontal pixel density */
+  UINT16 Y_density;		/* Vertical pixel density */
+  boolean write_Adobe_marker;	/* should an Adobe marker be written? */
+  
+  /* State variable: index of next scanline to be written to
+   * jpeg_write_scanlines().  Application may use this to control its
+   * processing loop, e.g., "while (next_scanline < image_height)".
+   */
+
+  JDIMENSION next_scanline;	/* 0 .. image_height-1  */
+
+  /* Remaining fields are known throughout compressor, but generally
+   * should not be touched by a surrounding application.
+   */
+
+  /*
+   * These fields are computed during compression startup
+   */
+  boolean progressive_mode;	/* TRUE if scan script uses progressive mode */
+  int max_h_samp_factor;	/* largest h_samp_factor */
+  int max_v_samp_factor;	/* largest v_samp_factor */
+
+#if JPEG_LIB_VERSION >= 70
+  int min_DCT_h_scaled_size;	/* smallest DCT_h_scaled_size of any component */
+  int min_DCT_v_scaled_size;	/* smallest DCT_v_scaled_size of any component */
+#endif
+
+  JDIMENSION total_iMCU_rows;	/* # of iMCU rows to be input to coef ctlr */
+  /* The coefficient controller receives data in units of MCU rows as defined
+   * for fully interleaved scans (whether the JPEG file is interleaved or not).
+   * There are v_samp_factor * DCTSIZE sample rows of each component in an
+   * "iMCU" (interleaved MCU) row.
+   */
+  
+  /*
+   * These fields are valid during any one scan.
+   * They describe the components and MCUs actually appearing in the scan.
+   */
+  int comps_in_scan;		/* # of JPEG components in this scan */
+  jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN];
+  /* *cur_comp_info[i] describes component that appears i'th in SOS */
+  
+  JDIMENSION MCUs_per_row;	/* # of MCUs across the image */
+  JDIMENSION MCU_rows_in_scan;	/* # of MCU rows in the image */
+  
+  int blocks_in_MCU;		/* # of DCT blocks per MCU */
+  int MCU_membership[C_MAX_BLOCKS_IN_MCU];
+  /* MCU_membership[i] is index in cur_comp_info of component owning */
+  /* i'th block in an MCU */
+
+  int Ss, Se, Ah, Al;		/* progressive JPEG parameters for scan */
+
+#if JPEG_LIB_VERSION >= 80
+  int block_size;		/* the basic DCT block size: 1..16 */
+  const int * natural_order;	/* natural-order position array */
+  int lim_Se;			/* min( Se, DCTSIZE2-1 ) */
+#endif
+
+  /*
+   * Links to compression subobjects (methods and private variables of modules)
+   */
+  struct jpeg_comp_master * master;
+  struct jpeg_c_main_controller * main;
+  struct jpeg_c_prep_controller * prep;
+  struct jpeg_c_coef_controller * coef;
+  struct jpeg_marker_writer * marker;
+  struct jpeg_color_converter * cconvert;
+  struct jpeg_downsampler * downsample;
+  struct jpeg_forward_dct * fdct;
+  struct jpeg_entropy_encoder * entropy;
+  jpeg_scan_info * script_space; /* workspace for jpeg_simple_progression */
+  int script_space_size;
+};
+
+
+/* Master record for a decompression instance */
+
+struct jpeg_decompress_struct {
+  jpeg_common_fields;		/* Fields shared with jpeg_compress_struct */
+
+  /* Source of compressed data */
+  struct jpeg_source_mgr * src;
+
+  /* Basic description of image --- filled in by jpeg_read_header(). */
+  /* Application may inspect these values to decide how to process image. */
+
+  JDIMENSION image_width;	/* nominal image width (from SOF marker) */
+  JDIMENSION image_height;	/* nominal image height */
+  int num_components;		/* # of color components in JPEG image */
+  J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */
+
+  /* Decompression processing parameters --- these fields must be set before
+   * calling jpeg_start_decompress().  Note that jpeg_read_header() initializes
+   * them to default values.
+   */
+
+  J_COLOR_SPACE out_color_space; /* colorspace for output */
+
+  unsigned int scale_num, scale_denom; /* fraction by which to scale image */
+
+  double output_gamma;		/* image gamma wanted in output */
+
+  boolean buffered_image;	/* TRUE=multiple output passes */
+  boolean raw_data_out;		/* TRUE=downsampled data wanted */
+
+  J_DCT_METHOD dct_method;	/* IDCT algorithm selector */
+  boolean do_fancy_upsampling;	/* TRUE=apply fancy upsampling */
+  boolean do_block_smoothing;	/* TRUE=apply interblock smoothing */
+
+  boolean quantize_colors;	/* TRUE=colormapped output wanted */
+  /* the following are ignored if not quantize_colors: */
+  J_DITHER_MODE dither_mode;	/* type of color dithering to use */
+  boolean two_pass_quantize;	/* TRUE=use two-pass color quantization */
+  int desired_number_of_colors;	/* max # colors to use in created colormap */
+  /* these are significant only in buffered-image mode: */
+  boolean enable_1pass_quant;	/* enable future use of 1-pass quantizer */
+  boolean enable_external_quant;/* enable future use of external colormap */
+  boolean enable_2pass_quant;	/* enable future use of 2-pass quantizer */
+
+  /* Description of actual output image that will be returned to application.
+   * These fields are computed by jpeg_start_decompress().
+   * You can also use jpeg_calc_output_dimensions() to determine these values
+   * in advance of calling jpeg_start_decompress().
+   */
+
+  JDIMENSION output_width;	/* scaled image width */
+  JDIMENSION output_height;	/* scaled image height */
+  int out_color_components;	/* # of color components in out_color_space */
+  int output_components;	/* # of color components returned */
+  /* output_components is 1 (a colormap index) when quantizing colors;
+   * otherwise it equals out_color_components.
+   */
+  int rec_outbuf_height;	/* min recommended height of scanline buffer */
+  /* If the buffer passed to jpeg_read_scanlines() is less than this many rows
+   * high, space and time will be wasted due to unnecessary data copying.
+   * Usually rec_outbuf_height will be 1 or 2, at most 4.
+   */
+
+  /* When quantizing colors, the output colormap is described by these fields.
+   * The application can supply a colormap by setting colormap non-NULL before
+   * calling jpeg_start_decompress; otherwise a colormap is created during
+   * jpeg_start_decompress or jpeg_start_output.
+   * The map has out_color_components rows and actual_number_of_colors columns.
+   */
+  int actual_number_of_colors;	/* number of entries in use */
+  JSAMPARRAY colormap;		/* The color map as a 2-D pixel array */
+
+  /* State variables: these variables indicate the progress of decompression.
+   * The application may examine these but must not modify them.
+   */
+
+  /* Row index of next scanline to be read from jpeg_read_scanlines().
+   * Application may use this to control its processing loop, e.g.,
+   * "while (output_scanline < output_height)".
+   */
+  JDIMENSION output_scanline;	/* 0 .. output_height-1  */
+
+  /* Current input scan number and number of iMCU rows completed in scan.
+   * These indicate the progress of the decompressor input side.
+   */
+  int input_scan_number;	/* Number of SOS markers seen so far */
+  JDIMENSION input_iMCU_row;	/* Number of iMCU rows completed */
+
+  /* The "output scan number" is the notional scan being displayed by the
+   * output side.  The decompressor will not allow output scan/row number
+   * to get ahead of input scan/row, but it can fall arbitrarily far behind.
+   */
+  int output_scan_number;	/* Nominal scan number being displayed */
+  JDIMENSION output_iMCU_row;	/* Number of iMCU rows read */
+
+  /* Current progression status.  coef_bits[c][i] indicates the precision
+   * with which component c's DCT coefficient i (in zigzag order) is known.
+   * It is -1 when no data has yet been received, otherwise it is the point
+   * transform (shift) value for the most recent scan of the coefficient
+   * (thus, 0 at completion of the progression).
+   * This pointer is NULL when reading a non-progressive file.
+   */
+  int (*coef_bits)[DCTSIZE2];	/* -1 or current Al value for each coef */
+
+  /* Internal JPEG parameters --- the application usually need not look at
+   * these fields.  Note that the decompressor output side may not use
+   * any parameters that can change between scans.
+   */
+
+  /* Quantization and Huffman tables are carried forward across input
+   * datastreams when processing abbreviated JPEG datastreams.
+   */
+
+  JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS];
+  /* ptrs to coefficient quantization tables, or NULL if not defined */
+
+  JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
+  JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
+  /* ptrs to Huffman coding tables, or NULL if not defined */
+
+  /* These parameters are never carried across datastreams, since they
+   * are given in SOF/SOS markers or defined to be reset by SOI.
+   */
+
+  int data_precision;		/* bits of precision in image data */
+
+  jpeg_component_info * comp_info;
+  /* comp_info[i] describes component that appears i'th in SOF */
+
+#if JPEG_LIB_VERSION >= 80
+  boolean is_baseline;		/* TRUE if Baseline SOF0 encountered */
+#endif
+  boolean progressive_mode;	/* TRUE if SOFn specifies progressive mode */
+  boolean arith_code;		/* TRUE=arithmetic coding, FALSE=Huffman */
+
+  UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */
+  UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */
+  UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */
+
+  unsigned int restart_interval; /* MCUs per restart interval, or 0 for no restart */
+
+  /* These fields record data obtained from optional markers recognized by
+   * the JPEG library.
+   */
+  boolean saw_JFIF_marker;	/* TRUE iff a JFIF APP0 marker was found */
+  /* Data copied from JFIF marker; only valid if saw_JFIF_marker is TRUE: */
+  UINT8 JFIF_major_version;	/* JFIF version number */
+  UINT8 JFIF_minor_version;
+  UINT8 density_unit;		/* JFIF code for pixel size units */
+  UINT16 X_density;		/* Horizontal pixel density */
+  UINT16 Y_density;		/* Vertical pixel density */
+  boolean saw_Adobe_marker;	/* TRUE iff an Adobe APP14 marker was found */
+  UINT8 Adobe_transform;	/* Color transform code from Adobe marker */
+
+  boolean CCIR601_sampling;	/* TRUE=first samples are cosited */
+
+  /* Aside from the specific data retained from APPn markers known to the
+   * library, the uninterpreted contents of any or all APPn and COM markers
+   * can be saved in a list for examination by the application.
+   */
+  jpeg_saved_marker_ptr marker_list; /* Head of list of saved markers */
+
+  /* Remaining fields are known throughout decompressor, but generally
+   * should not be touched by a surrounding application.
+   */
+
+  /*
+   * These fields are computed during decompression startup
+   */
+  int max_h_samp_factor;	/* largest h_samp_factor */
+  int max_v_samp_factor;	/* largest v_samp_factor */
+
+#if JPEG_LIB_VERSION >= 70
+  int min_DCT_h_scaled_size;	/* smallest DCT_h_scaled_size of any component */
+  int min_DCT_v_scaled_size;	/* smallest DCT_v_scaled_size of any component */
+#else
+  int min_DCT_scaled_size;	/* smallest DCT_scaled_size of any component */
+#endif
+
+  JDIMENSION total_iMCU_rows;	/* # of iMCU rows in image */
+  /* The coefficient controller's input and output progress is measured in
+   * units of "iMCU" (interleaved MCU) rows.  These are the same as MCU rows
+   * in fully interleaved JPEG scans, but are used whether the scan is
+   * interleaved or not.  We define an iMCU row as v_samp_factor DCT block
+   * rows of each component.  Therefore, the IDCT output contains
+   * v_samp_factor*DCT_[v_]scaled_size sample rows of a component per iMCU row.
+   */
+
+  JSAMPLE * sample_range_limit; /* table for fast range-limiting */
+
+  /*
+   * These fields are valid during any one scan.
+   * They describe the components and MCUs actually appearing in the scan.
+   * Note that the decompressor output side must not use these fields.
+   */
+  int comps_in_scan;		/* # of JPEG components in this scan */
+  jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN];
+  /* *cur_comp_info[i] describes component that appears i'th in SOS */
+
+  JDIMENSION MCUs_per_row;	/* # of MCUs across the image */
+  JDIMENSION MCU_rows_in_scan;	/* # of MCU rows in the image */
+
+  int blocks_in_MCU;		/* # of DCT blocks per MCU */
+  int MCU_membership[D_MAX_BLOCKS_IN_MCU];
+  /* MCU_membership[i] is index in cur_comp_info of component owning */
+  /* i'th block in an MCU */
+
+  int Ss, Se, Ah, Al;		/* progressive JPEG parameters for scan */
+
+#if JPEG_LIB_VERSION >= 80
+  /* These fields are derived from Se of first SOS marker.
+   */
+  int block_size;		/* the basic DCT block size: 1..16 */
+  const int * natural_order; /* natural-order position array for entropy decode */
+  int lim_Se;			/* min( Se, DCTSIZE2-1 ) for entropy decode */
+#endif
+
+  /* This field is shared between entropy decoder and marker parser.
+   * It is either zero or the code of a JPEG marker that has been
+   * read from the data source, but has not yet been processed.
+   */
+  int unread_marker;
+
+  /*
+   * Links to decompression subobjects (methods, private variables of modules)
+   */
+  struct jpeg_decomp_master * master;
+  struct jpeg_d_main_controller * main;
+  struct jpeg_d_coef_controller * coef;
+  struct jpeg_d_post_controller * post;
+  struct jpeg_input_controller * inputctl;
+  struct jpeg_marker_reader * marker;
+  struct jpeg_entropy_decoder * entropy;
+  struct jpeg_inverse_dct * idct;
+  struct jpeg_upsampler * upsample;
+  struct jpeg_color_deconverter * cconvert;
+  struct jpeg_color_quantizer * cquantize;
+};
+
+
+/* "Object" declarations for JPEG modules that may be supplied or called
+ * directly by the surrounding application.
+ * As with all objects in the JPEG library, these structs only define the
+ * publicly visible methods and state variables of a module.  Additional
+ * private fields may exist after the public ones.
+ */
+
+
+/* Error handler object */
+
+struct jpeg_error_mgr {
+  /* Error exit handler: does not return to caller */
+  JMETHOD(void, error_exit, (j_common_ptr cinfo));
+  /* Conditionally emit a trace or warning message */
+  JMETHOD(void, emit_message, (j_common_ptr cinfo, int msg_level));
+  /* Routine that actually outputs a trace or error message */
+  JMETHOD(void, output_message, (j_common_ptr cinfo));
+  /* Format a message string for the most recent JPEG error or message */
+  JMETHOD(void, format_message, (j_common_ptr cinfo, char * buffer));
+#define JMSG_LENGTH_MAX  200	/* recommended size of format_message buffer */
+  /* Reset error state variables at start of a new image */
+  JMETHOD(void, reset_error_mgr, (j_common_ptr cinfo));
+  
+  /* The message ID code and any parameters are saved here.
+   * A message can have one string parameter or up to 8 int parameters.
+   */
+  int msg_code;
+#define JMSG_STR_PARM_MAX  80
+  union {
+    int i[8];
+    char s[JMSG_STR_PARM_MAX];
+  } msg_parm;
+  
+  /* Standard state variables for error facility */
+  
+  int trace_level;		/* max msg_level that will be displayed */
+  
+  /* For recoverable corrupt-data errors, we emit a warning message,
+   * but keep going unless emit_message chooses to abort.  emit_message
+   * should count warnings in num_warnings.  The surrounding application
+   * can check for bad data by seeing if num_warnings is nonzero at the
+   * end of processing.
+   */
+  long num_warnings;		/* number of corrupt-data warnings */
+
+  /* These fields point to the table(s) of error message strings.
+   * An application can change the table pointer to switch to a different
+   * message list (typically, to change the language in which errors are
+   * reported).  Some applications may wish to add additional error codes
+   * that will be handled by the JPEG library error mechanism; the second
+   * table pointer is used for this purpose.
+   *
+   * First table includes all errors generated by JPEG library itself.
+   * Error code 0 is reserved for a "no such error string" message.
+   */
+  const char * const * jpeg_message_table; /* Library errors */
+  int last_jpeg_message;    /* Table contains strings 0..last_jpeg_message */
+  /* Second table can be added by application (see cjpeg/djpeg for example).
+   * It contains strings numbered first_addon_message..last_addon_message.
+   */
+  const char * const * addon_message_table; /* Non-library errors */
+  int first_addon_message;	/* code for first string in addon table */
+  int last_addon_message;	/* code for last string in addon table */
+};
+
+
+/* Progress monitor object */
+
+struct jpeg_progress_mgr {
+  JMETHOD(void, progress_monitor, (j_common_ptr cinfo));
+
+  long pass_counter;		/* work units completed in this pass */
+  long pass_limit;		/* total number of work units in this pass */
+  int completed_passes;		/* passes completed so far */
+  int total_passes;		/* total number of passes expected */
+};
+
+
+/* Data destination object for compression */
+
+struct jpeg_destination_mgr {
+  JOCTET * next_output_byte;	/* => next byte to write in buffer */
+  size_t free_in_buffer;	/* # of byte spaces remaining in buffer */
+
+  JMETHOD(void, init_destination, (j_compress_ptr cinfo));
+  JMETHOD(boolean, empty_output_buffer, (j_compress_ptr cinfo));
+  JMETHOD(void, term_destination, (j_compress_ptr cinfo));
+};
+
+
+/* Data source object for decompression */
+
+struct jpeg_source_mgr {
+  const JOCTET * next_input_byte; /* => next byte to read from buffer */
+  size_t bytes_in_buffer;	/* # of bytes remaining in buffer */
+
+  JMETHOD(void, init_source, (j_decompress_ptr cinfo));
+  JMETHOD(boolean, fill_input_buffer, (j_decompress_ptr cinfo));
+  JMETHOD(void, skip_input_data, (j_decompress_ptr cinfo, long num_bytes));
+  JMETHOD(boolean, resync_to_restart, (j_decompress_ptr cinfo, int desired));
+  JMETHOD(void, term_source, (j_decompress_ptr cinfo));
+};
+
+
+/* Memory manager object.
+ * Allocates "small" objects (a few K total), "large" objects (tens of K),
+ * and "really big" objects (virtual arrays with backing store if needed).
+ * The memory manager does not allow individual objects to be freed; rather,
+ * each created object is assigned to a pool, and whole pools can be freed
+ * at once.  This is faster and more convenient than remembering exactly what
+ * to free, especially where malloc()/free() are not too speedy.
+ * NB: alloc routines never return NULL.  They exit to error_exit if not
+ * successful.
+ */
+
+#define JPOOL_PERMANENT	0	/* lasts until master record is destroyed */
+#define JPOOL_IMAGE	1	/* lasts until done with image/datastream */
+#define JPOOL_NUMPOOLS	2
+
+typedef struct jvirt_sarray_control * jvirt_sarray_ptr;
+typedef struct jvirt_barray_control * jvirt_barray_ptr;
+
+
+struct jpeg_memory_mgr {
+  /* Method pointers */
+  JMETHOD(void *, alloc_small, (j_common_ptr cinfo, int pool_id,
+				size_t sizeofobject));
+  JMETHOD(void FAR *, alloc_large, (j_common_ptr cinfo, int pool_id,
+				     size_t sizeofobject));
+  JMETHOD(JSAMPARRAY, alloc_sarray, (j_common_ptr cinfo, int pool_id,
+				     JDIMENSION samplesperrow,
+				     JDIMENSION numrows));
+  JMETHOD(JBLOCKARRAY, alloc_barray, (j_common_ptr cinfo, int pool_id,
+				      JDIMENSION blocksperrow,
+				      JDIMENSION numrows));
+  JMETHOD(jvirt_sarray_ptr, request_virt_sarray, (j_common_ptr cinfo,
+						  int pool_id,
+						  boolean pre_zero,
+						  JDIMENSION samplesperrow,
+						  JDIMENSION numrows,
+						  JDIMENSION maxaccess));
+  JMETHOD(jvirt_barray_ptr, request_virt_barray, (j_common_ptr cinfo,
+						  int pool_id,
+						  boolean pre_zero,
+						  JDIMENSION blocksperrow,
+						  JDIMENSION numrows,
+						  JDIMENSION maxaccess));
+  JMETHOD(void, realize_virt_arrays, (j_common_ptr cinfo));
+  JMETHOD(JSAMPARRAY, access_virt_sarray, (j_common_ptr cinfo,
+					   jvirt_sarray_ptr ptr,
+					   JDIMENSION start_row,
+					   JDIMENSION num_rows,
+					   boolean writable));
+  JMETHOD(JBLOCKARRAY, access_virt_barray, (j_common_ptr cinfo,
+					    jvirt_barray_ptr ptr,
+					    JDIMENSION start_row,
+					    JDIMENSION num_rows,
+					    boolean writable));
+  JMETHOD(void, free_pool, (j_common_ptr cinfo, int pool_id));
+  JMETHOD(void, self_destruct, (j_common_ptr cinfo));
+
+  /* Limit on memory allocation for this JPEG object.  (Note that this is
+   * merely advisory, not a guaranteed maximum; it only affects the space
+   * used for virtual-array buffers.)  May be changed by outer application
+   * after creating the JPEG object.
+   */
+  long max_memory_to_use;
+
+  /* Maximum allocation request accepted by alloc_large. */
+  long max_alloc_chunk;
+};
+
+
+/* Routine signature for application-supplied marker processing methods.
+ * Need not pass marker code since it is stored in cinfo->unread_marker.
+ */
+typedef JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo));
+
+
+/* Declarations for routines called by application.
+ * The JPP macro hides prototype parameters from compilers that can't cope.
+ * Note JPP requires double parentheses.
+ */
+
+#ifdef HAVE_PROTOTYPES
+#define JPP(arglist)	arglist
+#else
+#define JPP(arglist)	()
+#endif
+
+
+/* Short forms of external names for systems with brain-damaged linkers.
+ * We shorten external names to be unique in the first six letters, which
+ * is good enough for all known systems.
+ * (If your compiler itself needs names to be unique in less than 15 
+ * characters, you are out of luck.  Get a better compiler.)
+ */
+
+#ifdef NEED_SHORT_EXTERNAL_NAMES
+#define jpeg_std_error		jStdError
+#define jpeg_CreateCompress	jCreaCompress
+#define jpeg_CreateDecompress	jCreaDecompress
+#define jpeg_destroy_compress	jDestCompress
+#define jpeg_destroy_decompress	jDestDecompress
+#define jpeg_stdio_dest		jStdDest
+#define jpeg_stdio_src		jStdSrc
+#if JPEG_LIB_VERSION >= 80
+#define jpeg_mem_dest		jMemDest
+#define jpeg_mem_src		jMemSrc
+#endif
+#define jpeg_set_defaults	jSetDefaults
+#define jpeg_set_colorspace	jSetColorspace
+#define jpeg_default_colorspace	jDefColorspace
+#define jpeg_set_quality	jSetQuality
+#define jpeg_set_linear_quality	jSetLQuality
+#if JPEG_LIB_VERSION >= 70
+#define jpeg_default_qtables	jDefQTables
+#endif
+#define jpeg_add_quant_table	jAddQuantTable
+#define jpeg_quality_scaling	jQualityScaling
+#define jpeg_simple_progression	jSimProgress
+#define jpeg_suppress_tables	jSuppressTables
+#define jpeg_alloc_quant_table	jAlcQTable
+#define jpeg_alloc_huff_table	jAlcHTable
+#define jpeg_start_compress	jStrtCompress
+#define jpeg_write_scanlines	jWrtScanlines
+#define jpeg_finish_compress	jFinCompress
+#if JPEG_LIB_VERSION >= 70
+#define jpeg_calc_jpeg_dimensions	jCjpegDimensions
+#endif
+#define jpeg_write_raw_data	jWrtRawData
+#define jpeg_write_marker	jWrtMarker
+#define jpeg_write_m_header	jWrtMHeader
+#define jpeg_write_m_byte	jWrtMByte
+#define jpeg_write_tables	jWrtTables
+#define jpeg_read_header	jReadHeader
+#define jpeg_start_decompress	jStrtDecompress
+#define jpeg_read_scanlines	jReadScanlines
+#define jpeg_finish_decompress	jFinDecompress
+#define jpeg_read_raw_data	jReadRawData
+#define jpeg_has_multiple_scans	jHasMultScn
+#define jpeg_start_output	jStrtOutput
+#define jpeg_finish_output	jFinOutput
+#define jpeg_input_complete	jInComplete
+#define jpeg_new_colormap	jNewCMap
+#define jpeg_consume_input	jConsumeInput
+#if JPEG_LIB_VERSION >= 80
+#define jpeg_core_output_dimensions	jCoreDimensions
+#endif
+#define jpeg_calc_output_dimensions	jCalcDimensions
+#define jpeg_save_markers	jSaveMarkers
+#define jpeg_set_marker_processor	jSetMarker
+#define jpeg_read_coefficients	jReadCoefs
+#define jpeg_write_coefficients	jWrtCoefs
+#define jpeg_copy_critical_parameters	jCopyCrit
+#define jpeg_abort_compress	jAbrtCompress
+#define jpeg_abort_decompress	jAbrtDecompress
+#define jpeg_abort		jAbort
+#define jpeg_destroy		jDestroy
+#define jpeg_resync_to_restart	jResyncRestart
+#endif /* NEED_SHORT_EXTERNAL_NAMES */
+
+
+/* Default error-management setup */
+EXTERN(struct jpeg_error_mgr *) jpeg_std_error
+	JPP((struct jpeg_error_mgr * err));
+
+/* Initialization of JPEG compression objects.
+ * jpeg_create_compress() and jpeg_create_decompress() are the exported
+ * names that applications should call.  These expand to calls on
+ * jpeg_CreateCompress and jpeg_CreateDecompress with additional information
+ * passed for version mismatch checking.
+ * NB: you must set up the error-manager BEFORE calling jpeg_create_xxx.
+ */
+#define jpeg_create_compress(cinfo) \
+    jpeg_CreateCompress((cinfo), JPEG_LIB_VERSION, \
+			(size_t) sizeof(struct jpeg_compress_struct))
+#define jpeg_create_decompress(cinfo) \
+    jpeg_CreateDecompress((cinfo), JPEG_LIB_VERSION, \
+			  (size_t) sizeof(struct jpeg_decompress_struct))
+EXTERN(void) jpeg_CreateCompress JPP((j_compress_ptr cinfo,
+				      int version, size_t structsize));
+EXTERN(void) jpeg_CreateDecompress JPP((j_decompress_ptr cinfo,
+					int version, size_t structsize));
+/* Destruction of JPEG compression objects */
+EXTERN(void) jpeg_destroy_compress JPP((j_compress_ptr cinfo));
+EXTERN(void) jpeg_destroy_decompress JPP((j_decompress_ptr cinfo));
+
+/* Standard data source and destination managers: stdio streams. */
+/* Caller is responsible for opening the file before and closing after. */
+EXTERN(void) jpeg_stdio_dest JPP((j_compress_ptr cinfo, FILE * outfile));
+EXTERN(void) jpeg_stdio_src JPP((j_decompress_ptr cinfo, FILE * infile));
+
+#if JPEG_LIB_VERSION >= 80
+/* Data source and destination managers: memory buffers. */
+EXTERN(void) jpeg_mem_dest JPP((j_compress_ptr cinfo,
+			       unsigned char ** outbuffer,
+			       unsigned long * outsize));
+EXTERN(void) jpeg_mem_src JPP((j_decompress_ptr cinfo,
+			      unsigned char * inbuffer,
+			      unsigned long insize));
+#endif
+
+/* Default parameter setup for compression */
+EXTERN(void) jpeg_set_defaults JPP((j_compress_ptr cinfo));
+/* Compression parameter setup aids */
+EXTERN(void) jpeg_set_colorspace JPP((j_compress_ptr cinfo,
+				      J_COLOR_SPACE colorspace));
+EXTERN(void) jpeg_default_colorspace JPP((j_compress_ptr cinfo));
+EXTERN(void) jpeg_set_quality JPP((j_compress_ptr cinfo, int quality,
+				   boolean force_baseline));
+EXTERN(void) jpeg_set_linear_quality JPP((j_compress_ptr cinfo,
+					  int scale_factor,
+					  boolean force_baseline));
+#if JPEG_LIB_VERSION >= 70
+EXTERN(void) jpeg_default_qtables JPP((j_compress_ptr cinfo,
+				       boolean force_baseline));
+#endif
+EXTERN(void) jpeg_add_quant_table JPP((j_compress_ptr cinfo, int which_tbl,
+				       const unsigned int *basic_table,
+				       int scale_factor,
+				       boolean force_baseline));
+EXTERN(int) jpeg_quality_scaling JPP((int quality));
+EXTERN(void) jpeg_simple_progression JPP((j_compress_ptr cinfo));
+EXTERN(void) jpeg_suppress_tables JPP((j_compress_ptr cinfo,
+				       boolean suppress));
+EXTERN(JQUANT_TBL *) jpeg_alloc_quant_table JPP((j_common_ptr cinfo));
+EXTERN(JHUFF_TBL *) jpeg_alloc_huff_table JPP((j_common_ptr cinfo));
+
+/* Main entry points for compression */
+EXTERN(void) jpeg_start_compress JPP((j_compress_ptr cinfo,
+				      boolean write_all_tables));
+EXTERN(JDIMENSION) jpeg_write_scanlines JPP((j_compress_ptr cinfo,
+					     JSAMPARRAY scanlines,
+					     JDIMENSION num_lines));
+EXTERN(void) jpeg_finish_compress JPP((j_compress_ptr cinfo));
+
+#if JPEG_LIB_VERSION >= 70
+/* Precalculate JPEG dimensions for current compression parameters. */
+EXTERN(void) jpeg_calc_jpeg_dimensions JPP((j_compress_ptr cinfo));
+#endif
+
+/* Replaces jpeg_write_scanlines when writing raw downsampled data. */
+EXTERN(JDIMENSION) jpeg_write_raw_data JPP((j_compress_ptr cinfo,
+					    JSAMPIMAGE data,
+					    JDIMENSION num_lines));
+
+/* Write a special marker.  See libjpeg.txt concerning safe usage. */
+EXTERN(void) jpeg_write_marker
+	JPP((j_compress_ptr cinfo, int marker,
+	     const JOCTET * dataptr, unsigned int datalen));
+/* Same, but piecemeal. */
+EXTERN(void) jpeg_write_m_header
+	JPP((j_compress_ptr cinfo, int marker, unsigned int datalen));
+EXTERN(void) jpeg_write_m_byte
+	JPP((j_compress_ptr cinfo, int val));
+
+/* Alternate compression function: just write an abbreviated table file */
+EXTERN(void) jpeg_write_tables JPP((j_compress_ptr cinfo));
+
+/* Decompression startup: read start of JPEG datastream to see what's there */
+EXTERN(int) jpeg_read_header JPP((j_decompress_ptr cinfo,
+				  boolean require_image));
+/* Return value is one of: */
+#define JPEG_SUSPENDED		0 /* Suspended due to lack of input data */
+#define JPEG_HEADER_OK		1 /* Found valid image datastream */
+#define JPEG_HEADER_TABLES_ONLY	2 /* Found valid table-specs-only datastream */
+/* If you pass require_image = TRUE (normal case), you need not check for
+ * a TABLES_ONLY return code; an abbreviated file will cause an error exit.
+ * JPEG_SUSPENDED is only possible if you use a data source module that can
+ * give a suspension return (the stdio source module doesn't).
+ */
+
+/* Main entry points for decompression */
+EXTERN(boolean) jpeg_start_decompress JPP((j_decompress_ptr cinfo));
+EXTERN(JDIMENSION) jpeg_read_scanlines JPP((j_decompress_ptr cinfo,
+					    JSAMPARRAY scanlines,
+					    JDIMENSION max_lines));
+EXTERN(boolean) jpeg_finish_decompress JPP((j_decompress_ptr cinfo));
+
+/* Replaces jpeg_read_scanlines when reading raw downsampled data. */
+EXTERN(JDIMENSION) jpeg_read_raw_data JPP((j_decompress_ptr cinfo,
+					   JSAMPIMAGE data,
+					   JDIMENSION max_lines));
+
+/* Additional entry points for buffered-image mode. */
+EXTERN(boolean) jpeg_has_multiple_scans JPP((j_decompress_ptr cinfo));
+EXTERN(boolean) jpeg_start_output JPP((j_decompress_ptr cinfo,
+				       int scan_number));
+EXTERN(boolean) jpeg_finish_output JPP((j_decompress_ptr cinfo));
+EXTERN(boolean) jpeg_input_complete JPP((j_decompress_ptr cinfo));
+EXTERN(void) jpeg_new_colormap JPP((j_decompress_ptr cinfo));
+EXTERN(int) jpeg_consume_input JPP((j_decompress_ptr cinfo));
+/* Return value is one of: */
+/* #define JPEG_SUSPENDED	0    Suspended due to lack of input data */
+#define JPEG_REACHED_SOS	1 /* Reached start of new scan */
+#define JPEG_REACHED_EOI	2 /* Reached end of image */
+#define JPEG_ROW_COMPLETED	3 /* Completed one iMCU row */
+#define JPEG_SCAN_COMPLETED	4 /* Completed last iMCU row of a scan */
+
+/* Precalculate output dimensions for current decompression parameters. */
+#if JPEG_LIB_VERSION >= 80
+EXTERN(void) jpeg_core_output_dimensions JPP((j_decompress_ptr cinfo));
+#endif
+EXTERN(void) jpeg_calc_output_dimensions JPP((j_decompress_ptr cinfo));
+
+/* Control saving of COM and APPn markers into marker_list. */
+EXTERN(void) jpeg_save_markers
+	JPP((j_decompress_ptr cinfo, int marker_code,
+	     unsigned int length_limit));
+
+/* Install a special processing method for COM or APPn markers. */
+EXTERN(void) jpeg_set_marker_processor
+	JPP((j_decompress_ptr cinfo, int marker_code,
+	     jpeg_marker_parser_method routine));
+
+/* Read or write raw DCT coefficients --- useful for lossless transcoding. */
+EXTERN(jvirt_barray_ptr *) jpeg_read_coefficients JPP((j_decompress_ptr cinfo));
+EXTERN(void) jpeg_write_coefficients JPP((j_compress_ptr cinfo,
+					  jvirt_barray_ptr * coef_arrays));
+EXTERN(void) jpeg_copy_critical_parameters JPP((j_decompress_ptr srcinfo,
+						j_compress_ptr dstinfo));
+
+/* If you choose to abort compression or decompression before completing
+ * jpeg_finish_(de)compress, then you need to clean up to release memory,
+ * temporary files, etc.  You can just call jpeg_destroy_(de)compress
+ * if you're done with the JPEG object, but if you want to clean it up and
+ * reuse it, call this:
+ */
+EXTERN(void) jpeg_abort_compress JPP((j_compress_ptr cinfo));
+EXTERN(void) jpeg_abort_decompress JPP((j_decompress_ptr cinfo));
+
+/* Generic versions of jpeg_abort and jpeg_destroy that work on either
+ * flavor of JPEG object.  These may be more convenient in some places.
+ */
+EXTERN(void) jpeg_abort JPP((j_common_ptr cinfo));
+EXTERN(void) jpeg_destroy JPP((j_common_ptr cinfo));
+
+/* Default restart-marker-resync procedure for use by data source modules */
+EXTERN(boolean) jpeg_resync_to_restart JPP((j_decompress_ptr cinfo,
+					    int desired));
+
+
+/* These marker codes are exported since applications and data source modules
+ * are likely to want to use them.
+ */
+
+#define JPEG_RST0	0xD0	/* RST0 marker code */
+#define JPEG_EOI	0xD9	/* EOI marker code */
+#define JPEG_APP0	0xE0	/* APP0 marker code */
+#define JPEG_COM	0xFE	/* COM marker code */
+
+
+/* If we have a brain-damaged compiler that emits warnings (or worse, errors)
+ * for structure definitions that are never filled in, keep it quiet by
+ * supplying dummy definitions for the various substructures.
+ */
+
+#ifdef INCOMPLETE_TYPES_BROKEN
+#ifndef JPEG_INTERNALS		/* will be defined in jpegint.h */
+struct jvirt_sarray_control { long dummy; };
+struct jvirt_barray_control { long dummy; };
+struct jpeg_comp_master { long dummy; };
+struct jpeg_c_main_controller { long dummy; };
+struct jpeg_c_prep_controller { long dummy; };
+struct jpeg_c_coef_controller { long dummy; };
+struct jpeg_marker_writer { long dummy; };
+struct jpeg_color_converter { long dummy; };
+struct jpeg_downsampler { long dummy; };
+struct jpeg_forward_dct { long dummy; };
+struct jpeg_entropy_encoder { long dummy; };
+struct jpeg_decomp_master { long dummy; };
+struct jpeg_d_main_controller { long dummy; };
+struct jpeg_d_coef_controller { long dummy; };
+struct jpeg_d_post_controller { long dummy; };
+struct jpeg_input_controller { long dummy; };
+struct jpeg_marker_reader { long dummy; };
+struct jpeg_entropy_decoder { long dummy; };
+struct jpeg_inverse_dct { long dummy; };
+struct jpeg_upsampler { long dummy; };
+struct jpeg_color_deconverter { long dummy; };
+struct jpeg_color_quantizer { long dummy; };
+#endif /* JPEG_INTERNALS */
+#endif /* INCOMPLETE_TYPES_BROKEN */
+
+
+/*
+ * The JPEG library modules define JPEG_INTERNALS before including this file.
+ * The internal structure declarations are read only when that is true.
+ * Applications using the library should not include jpegint.h, but may wish
+ * to include jerror.h.
+ */
+
+#ifdef JPEG_INTERNALS
+#include "jpegint.h"		/* fetch private declarations */
+#include "jerror.h"		/* fetch error codes too */
+#endif
+
+#ifdef __cplusplus
+#ifndef DONT_USE_EXTERN_C
+}
+#endif
+#endif
+
+#endif /* JPEGLIB_H */
diff --git a/src/libjpeg-turbo/jquant1.c b/src/libjpeg-turbo/jquant1.c
new file mode 100644
index 0000000..362bb1e
--- /dev/null
+++ b/src/libjpeg-turbo/jquant1.c
@@ -0,0 +1,860 @@
+/*
+ * jquant1.c
+ *
+ * Copyright (C) 1991-1996, Thomas G. Lane.
+ * Copyright (C) 2009, D. R. Commander
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains 1-pass color quantization (color mapping) routines.
+ * These routines provide mapping to a fixed color map using equally spaced
+ * color values.  Optional Floyd-Steinberg or ordered dithering is available.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+
+#ifdef QUANT_1PASS_SUPPORTED
+
+
+/*
+ * The main purpose of 1-pass quantization is to provide a fast, if not very
+ * high quality, colormapped output capability.  A 2-pass quantizer usually
+ * gives better visual quality; however, for quantized grayscale output this
+ * quantizer is perfectly adequate.  Dithering is highly recommended with this
+ * quantizer, though you can turn it off if you really want to.
+ *
+ * In 1-pass quantization the colormap must be chosen in advance of seeing the
+ * image.  We use a map consisting of all combinations of Ncolors[i] color
+ * values for the i'th component.  The Ncolors[] values are chosen so that
+ * their product, the total number of colors, is no more than that requested.
+ * (In most cases, the product will be somewhat less.)
+ *
+ * Since the colormap is orthogonal, the representative value for each color
+ * component can be determined without considering the other components;
+ * then these indexes can be combined into a colormap index by a standard
+ * N-dimensional-array-subscript calculation.  Most of the arithmetic involved
+ * can be precalculated and stored in the lookup table colorindex[].
+ * colorindex[i][j] maps pixel value j in component i to the nearest
+ * representative value (grid plane) for that component; this index is
+ * multiplied by the array stride for component i, so that the
+ * index of the colormap entry closest to a given pixel value is just
+ *    sum( colorindex[component-number][pixel-component-value] )
+ * Aside from being fast, this scheme allows for variable spacing between
+ * representative values with no additional lookup cost.
+ *
+ * If gamma correction has been applied in color conversion, it might be wise
+ * to adjust the color grid spacing so that the representative colors are
+ * equidistant in linear space.  At this writing, gamma correction is not
+ * implemented by jdcolor, so nothing is done here.
+ */
+
+
+/* Declarations for ordered dithering.
+ *
+ * We use a standard 16x16 ordered dither array.  The basic concept of ordered
+ * dithering is described in many references, for instance Dale Schumacher's
+ * chapter II.2 of Graphics Gems II (James Arvo, ed. Academic Press, 1991).
+ * In place of Schumacher's comparisons against a "threshold" value, we add a
+ * "dither" value to the input pixel and then round the result to the nearest
+ * output value.  The dither value is equivalent to (0.5 - threshold) times
+ * the distance between output values.  For ordered dithering, we assume that
+ * the output colors are equally spaced; if not, results will probably be
+ * worse, since the dither may be too much or too little at a given point.
+ *
+ * The normal calculation would be to form pixel value + dither, range-limit
+ * this to 0..MAXJSAMPLE, and then index into the colorindex table as usual.
+ * We can skip the separate range-limiting step by extending the colorindex
+ * table in both directions.
+ */
+
+#define ODITHER_SIZE  16	/* dimension of dither matrix */
+/* NB: if ODITHER_SIZE is not a power of 2, ODITHER_MASK uses will break */
+#define ODITHER_CELLS (ODITHER_SIZE*ODITHER_SIZE)	/* # cells in matrix */
+#define ODITHER_MASK  (ODITHER_SIZE-1) /* mask for wrapping around counters */
+
+typedef int ODITHER_MATRIX[ODITHER_SIZE][ODITHER_SIZE];
+typedef int (*ODITHER_MATRIX_PTR)[ODITHER_SIZE];
+
+static const UINT8 base_dither_matrix[ODITHER_SIZE][ODITHER_SIZE] = {
+  /* Bayer's order-4 dither array.  Generated by the code given in
+   * Stephen Hawley's article "Ordered Dithering" in Graphics Gems I.
+   * The values in this array must range from 0 to ODITHER_CELLS-1.
+   */
+  {   0,192, 48,240, 12,204, 60,252,  3,195, 51,243, 15,207, 63,255 },
+  { 128, 64,176,112,140, 76,188,124,131, 67,179,115,143, 79,191,127 },
+  {  32,224, 16,208, 44,236, 28,220, 35,227, 19,211, 47,239, 31,223 },
+  { 160, 96,144, 80,172,108,156, 92,163, 99,147, 83,175,111,159, 95 },
+  {   8,200, 56,248,  4,196, 52,244, 11,203, 59,251,  7,199, 55,247 },
+  { 136, 72,184,120,132, 68,180,116,139, 75,187,123,135, 71,183,119 },
+  {  40,232, 24,216, 36,228, 20,212, 43,235, 27,219, 39,231, 23,215 },
+  { 168,104,152, 88,164,100,148, 84,171,107,155, 91,167,103,151, 87 },
+  {   2,194, 50,242, 14,206, 62,254,  1,193, 49,241, 13,205, 61,253 },
+  { 130, 66,178,114,142, 78,190,126,129, 65,177,113,141, 77,189,125 },
+  {  34,226, 18,210, 46,238, 30,222, 33,225, 17,209, 45,237, 29,221 },
+  { 162, 98,146, 82,174,110,158, 94,161, 97,145, 81,173,109,157, 93 },
+  {  10,202, 58,250,  6,198, 54,246,  9,201, 57,249,  5,197, 53,245 },
+  { 138, 74,186,122,134, 70,182,118,137, 73,185,121,133, 69,181,117 },
+  {  42,234, 26,218, 38,230, 22,214, 41,233, 25,217, 37,229, 21,213 },
+  { 170,106,154, 90,166,102,150, 86,169,105,153, 89,165,101,149, 85 }
+};
+
+
+/* Declarations for Floyd-Steinberg dithering.
+ *
+ * Errors are accumulated into the array fserrors[], at a resolution of
+ * 1/16th of a pixel count.  The error at a given pixel is propagated
+ * to its not-yet-processed neighbors using the standard F-S fractions,
+ *		...	(here)	7/16
+ *		3/16	5/16	1/16
+ * We work left-to-right on even rows, right-to-left on odd rows.
+ *
+ * We can get away with a single array (holding one row's worth of errors)
+ * by using it to store the current row's errors at pixel columns not yet
+ * processed, but the next row's errors at columns already processed.  We
+ * need only a few extra variables to hold the errors immediately around the
+ * current column.  (If we are lucky, those variables are in registers, but
+ * even if not, they're probably cheaper to access than array elements are.)
+ *
+ * The fserrors[] array is indexed [component#][position].
+ * We provide (#columns + 2) entries per component; the extra entry at each
+ * end saves us from special-casing the first and last pixels.
+ *
+ * Note: on a wide image, we might not have enough room in a PC's near data
+ * segment to hold the error array; so it is allocated with alloc_large.
+ */
+
+#if BITS_IN_JSAMPLE == 8
+typedef INT16 FSERROR;		/* 16 bits should be enough */
+typedef int LOCFSERROR;		/* use 'int' for calculation temps */
+#else
+typedef INT32 FSERROR;		/* may need more than 16 bits */
+typedef INT32 LOCFSERROR;	/* be sure calculation temps are big enough */
+#endif
+
+typedef FSERROR FAR *FSERRPTR;	/* pointer to error array (in FAR storage!) */
+
+
+/* Private subobject */
+
+#define MAX_Q_COMPS 4		/* max components I can handle */
+
+typedef struct {
+  struct jpeg_color_quantizer pub; /* public fields */
+
+  /* Initially allocated colormap is saved here */
+  JSAMPARRAY sv_colormap;	/* The color map as a 2-D pixel array */
+  int sv_actual;		/* number of entries in use */
+
+  JSAMPARRAY colorindex;	/* Precomputed mapping for speed */
+  /* colorindex[i][j] = index of color closest to pixel value j in component i,
+   * premultiplied as described above.  Since colormap indexes must fit into
+   * JSAMPLEs, the entries of this array will too.
+   */
+  boolean is_padded;		/* is the colorindex padded for odither? */
+
+  int Ncolors[MAX_Q_COMPS];	/* # of values alloced to each component */
+
+  /* Variables for ordered dithering */
+  int row_index;		/* cur row's vertical index in dither matrix */
+  ODITHER_MATRIX_PTR odither[MAX_Q_COMPS]; /* one dither array per component */
+
+  /* Variables for Floyd-Steinberg dithering */
+  FSERRPTR fserrors[MAX_Q_COMPS]; /* accumulated errors */
+  boolean on_odd_row;		/* flag to remember which row we are on */
+} my_cquantizer;
+
+typedef my_cquantizer * my_cquantize_ptr;
+
+
+/*
+ * Policy-making subroutines for create_colormap and create_colorindex.
+ * These routines determine the colormap to be used.  The rest of the module
+ * only assumes that the colormap is orthogonal.
+ *
+ *  * select_ncolors decides how to divvy up the available colors
+ *    among the components.
+ *  * output_value defines the set of representative values for a component.
+ *  * largest_input_value defines the mapping from input values to
+ *    representative values for a component.
+ * Note that the latter two routines may impose different policies for
+ * different components, though this is not currently done.
+ */
+
+
+LOCAL(int)
+select_ncolors (j_decompress_ptr cinfo, int Ncolors[])
+/* Determine allocation of desired colors to components, */
+/* and fill in Ncolors[] array to indicate choice. */
+/* Return value is total number of colors (product of Ncolors[] values). */
+{
+  int nc = cinfo->out_color_components; /* number of color components */
+  int max_colors = cinfo->desired_number_of_colors;
+  int total_colors, iroot, i, j;
+  boolean changed;
+  long temp;
+  int RGB_order[3] = { RGB_GREEN, RGB_RED, RGB_BLUE };
+  RGB_order[0] = rgb_green[cinfo->out_color_space];
+  RGB_order[1] = rgb_red[cinfo->out_color_space];
+  RGB_order[2] = rgb_blue[cinfo->out_color_space];
+
+  /* We can allocate at least the nc'th root of max_colors per component. */
+  /* Compute floor(nc'th root of max_colors). */
+  iroot = 1;
+  do {
+    iroot++;
+    temp = iroot;		/* set temp = iroot ** nc */
+    for (i = 1; i < nc; i++)
+      temp *= iroot;
+  } while (temp <= (long) max_colors); /* repeat till iroot exceeds root */
+  iroot--;			/* now iroot = floor(root) */
+
+  /* Must have at least 2 color values per component */
+  if (iroot < 2)
+    ERREXIT1(cinfo, JERR_QUANT_FEW_COLORS, (int) temp);
+
+  /* Initialize to iroot color values for each component */
+  total_colors = 1;
+  for (i = 0; i < nc; i++) {
+    Ncolors[i] = iroot;
+    total_colors *= iroot;
+  }
+  /* We may be able to increment the count for one or more components without
+   * exceeding max_colors, though we know not all can be incremented.
+   * Sometimes, the first component can be incremented more than once!
+   * (Example: for 16 colors, we start at 2*2*2, go to 3*2*2, then 4*2*2.)
+   * In RGB colorspace, try to increment G first, then R, then B.
+   */
+  do {
+    changed = FALSE;
+    for (i = 0; i < nc; i++) {
+      j = (cinfo->out_color_space == JCS_RGB ? RGB_order[i] : i);
+      /* calculate new total_colors if Ncolors[j] is incremented */
+      temp = total_colors / Ncolors[j];
+      temp *= Ncolors[j]+1;	/* done in long arith to avoid oflo */
+      if (temp > (long) max_colors)
+	break;			/* won't fit, done with this pass */
+      Ncolors[j]++;		/* OK, apply the increment */
+      total_colors = (int) temp;
+      changed = TRUE;
+    }
+  } while (changed);
+
+  return total_colors;
+}
+
+
+LOCAL(int)
+output_value (j_decompress_ptr cinfo, int ci, int j, int maxj)
+/* Return j'th output value, where j will range from 0 to maxj */
+/* The output values must fall in 0..MAXJSAMPLE in increasing order */
+{
+  /* We always provide values 0 and MAXJSAMPLE for each component;
+   * any additional values are equally spaced between these limits.
+   * (Forcing the upper and lower values to the limits ensures that
+   * dithering can't produce a color outside the selected gamut.)
+   */
+  return (int) (((INT32) j * MAXJSAMPLE + maxj/2) / maxj);
+}
+
+
+LOCAL(int)
+largest_input_value (j_decompress_ptr cinfo, int ci, int j, int maxj)
+/* Return largest input value that should map to j'th output value */
+/* Must have largest(j=0) >= 0, and largest(j=maxj) >= MAXJSAMPLE */
+{
+  /* Breakpoints are halfway between values returned by output_value */
+  return (int) (((INT32) (2*j + 1) * MAXJSAMPLE + maxj) / (2*maxj));
+}
+
+
+/*
+ * Create the colormap.
+ */
+
+LOCAL(void)
+create_colormap (j_decompress_ptr cinfo)
+{
+  my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
+  JSAMPARRAY colormap;		/* Created colormap */
+  int total_colors;		/* Number of distinct output colors */
+  int i,j,k, nci, blksize, blkdist, ptr, val;
+
+  /* Select number of colors for each component */
+  total_colors = select_ncolors(cinfo, cquantize->Ncolors);
+
+  /* Report selected color counts */
+  if (cinfo->out_color_components == 3)
+    TRACEMS4(cinfo, 1, JTRC_QUANT_3_NCOLORS,
+	     total_colors, cquantize->Ncolors[0],
+	     cquantize->Ncolors[1], cquantize->Ncolors[2]);
+  else
+    TRACEMS1(cinfo, 1, JTRC_QUANT_NCOLORS, total_colors);
+
+  /* Allocate and fill in the colormap. */
+  /* The colors are ordered in the map in standard row-major order, */
+  /* i.e. rightmost (highest-indexed) color changes most rapidly. */
+
+  colormap = (*cinfo->mem->alloc_sarray)
+    ((j_common_ptr) cinfo, JPOOL_IMAGE,
+     (JDIMENSION) total_colors, (JDIMENSION) cinfo->out_color_components);
+
+  /* blksize is number of adjacent repeated entries for a component */
+  /* blkdist is distance between groups of identical entries for a component */
+  blkdist = total_colors;
+
+  for (i = 0; i < cinfo->out_color_components; i++) {
+    /* fill in colormap entries for i'th color component */
+    nci = cquantize->Ncolors[i]; /* # of distinct values for this color */
+    blksize = blkdist / nci;
+    for (j = 0; j < nci; j++) {
+      /* Compute j'th output value (out of nci) for component */
+      val = output_value(cinfo, i, j, nci-1);
+      /* Fill in all colormap entries that have this value of this component */
+      for (ptr = j * blksize; ptr < total_colors; ptr += blkdist) {
+	/* fill in blksize entries beginning at ptr */
+	for (k = 0; k < blksize; k++)
+	  colormap[i][ptr+k] = (JSAMPLE) val;
+      }
+    }
+    blkdist = blksize;		/* blksize of this color is blkdist of next */
+  }
+
+  /* Save the colormap in private storage,
+   * where it will survive color quantization mode changes.
+   */
+  cquantize->sv_colormap = colormap;
+  cquantize->sv_actual = total_colors;
+}
+
+
+/*
+ * Create the color index table.
+ */
+
+LOCAL(void)
+create_colorindex (j_decompress_ptr cinfo)
+{
+  my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
+  JSAMPROW indexptr;
+  int i,j,k, nci, blksize, val, pad;
+
+  /* For ordered dither, we pad the color index tables by MAXJSAMPLE in
+   * each direction (input index values can be -MAXJSAMPLE .. 2*MAXJSAMPLE).
+   * This is not necessary in the other dithering modes.  However, we
+   * flag whether it was done in case user changes dithering mode.
+   */
+  if (cinfo->dither_mode == JDITHER_ORDERED) {
+    pad = MAXJSAMPLE*2;
+    cquantize->is_padded = TRUE;
+  } else {
+    pad = 0;
+    cquantize->is_padded = FALSE;
+  }
+
+  cquantize->colorindex = (*cinfo->mem->alloc_sarray)
+    ((j_common_ptr) cinfo, JPOOL_IMAGE,
+     (JDIMENSION) (MAXJSAMPLE+1 + pad),
+     (JDIMENSION) cinfo->out_color_components);
+
+  /* blksize is number of adjacent repeated entries for a component */
+  blksize = cquantize->sv_actual;
+
+  for (i = 0; i < cinfo->out_color_components; i++) {
+    /* fill in colorindex entries for i'th color component */
+    nci = cquantize->Ncolors[i]; /* # of distinct values for this color */
+    blksize = blksize / nci;
+
+    /* adjust colorindex pointers to provide padding at negative indexes. */
+    if (pad)
+      cquantize->colorindex[i] += MAXJSAMPLE;
+
+    /* in loop, val = index of current output value, */
+    /* and k = largest j that maps to current val */
+    indexptr = cquantize->colorindex[i];
+    val = 0;
+    k = largest_input_value(cinfo, i, 0, nci-1);
+    for (j = 0; j <= MAXJSAMPLE; j++) {
+      while (j > k)		/* advance val if past boundary */
+	k = largest_input_value(cinfo, i, ++val, nci-1);
+      /* premultiply so that no multiplication needed in main processing */
+      indexptr[j] = (JSAMPLE) (val * blksize);
+    }
+    /* Pad at both ends if necessary */
+    if (pad)
+      for (j = 1; j <= MAXJSAMPLE; j++) {
+	indexptr[-j] = indexptr[0];
+	indexptr[MAXJSAMPLE+j] = indexptr[MAXJSAMPLE];
+      }
+  }
+}
+
+
+/*
+ * Create an ordered-dither array for a component having ncolors
+ * distinct output values.
+ */
+
+LOCAL(ODITHER_MATRIX_PTR)
+make_odither_array (j_decompress_ptr cinfo, int ncolors)
+{
+  ODITHER_MATRIX_PTR odither;
+  int j,k;
+  INT32 num,den;
+
+  odither = (ODITHER_MATRIX_PTR)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				SIZEOF(ODITHER_MATRIX));
+  /* The inter-value distance for this color is MAXJSAMPLE/(ncolors-1).
+   * Hence the dither value for the matrix cell with fill order f
+   * (f=0..N-1) should be (N-1-2*f)/(2*N) * MAXJSAMPLE/(ncolors-1).
+   * On 16-bit-int machine, be careful to avoid overflow.
+   */
+  den = 2 * ODITHER_CELLS * ((INT32) (ncolors - 1));
+  for (j = 0; j < ODITHER_SIZE; j++) {
+    for (k = 0; k < ODITHER_SIZE; k++) {
+      num = ((INT32) (ODITHER_CELLS-1 - 2*((int)base_dither_matrix[j][k])))
+	    * MAXJSAMPLE;
+      /* Ensure round towards zero despite C's lack of consistency
+       * about rounding negative values in integer division...
+       */
+      odither[j][k] = (int) (num<0 ? -((-num)/den) : num/den);
+    }
+  }
+  return odither;
+}
+
+
+/*
+ * Create the ordered-dither tables.
+ * Components having the same number of representative colors may 
+ * share a dither table.
+ */
+
+LOCAL(void)
+create_odither_tables (j_decompress_ptr cinfo)
+{
+  my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
+  ODITHER_MATRIX_PTR odither;
+  int i, j, nci;
+
+  for (i = 0; i < cinfo->out_color_components; i++) {
+    nci = cquantize->Ncolors[i]; /* # of distinct values for this color */
+    odither = NULL;		/* search for matching prior component */
+    for (j = 0; j < i; j++) {
+      if (nci == cquantize->Ncolors[j]) {
+	odither = cquantize->odither[j];
+	break;
+      }
+    }
+    if (odither == NULL)	/* need a new table? */
+      odither = make_odither_array(cinfo, nci);
+    cquantize->odither[i] = odither;
+  }
+}
+
+
+/*
+ * Map some rows of pixels to the output colormapped representation.
+ */
+
+METHODDEF(void)
+color_quantize (j_decompress_ptr cinfo, JSAMPARRAY input_buf,
+		JSAMPARRAY output_buf, int num_rows)
+/* General case, no dithering */
+{
+  my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
+  JSAMPARRAY colorindex = cquantize->colorindex;
+  register int pixcode, ci;
+  register JSAMPROW ptrin, ptrout;
+  int row;
+  JDIMENSION col;
+  JDIMENSION width = cinfo->output_width;
+  register int nc = cinfo->out_color_components;
+
+  for (row = 0; row < num_rows; row++) {
+    ptrin = input_buf[row];
+    ptrout = output_buf[row];
+    for (col = width; col > 0; col--) {
+      pixcode = 0;
+      for (ci = 0; ci < nc; ci++) {
+	pixcode += GETJSAMPLE(colorindex[ci][GETJSAMPLE(*ptrin++)]);
+      }
+      *ptrout++ = (JSAMPLE) pixcode;
+    }
+  }
+}
+
+
+METHODDEF(void)
+color_quantize3 (j_decompress_ptr cinfo, JSAMPARRAY input_buf,
+		 JSAMPARRAY output_buf, int num_rows)
+/* Fast path for out_color_components==3, no dithering */
+{
+  my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
+  register int pixcode;
+  register JSAMPROW ptrin, ptrout;
+  JSAMPROW colorindex0 = cquantize->colorindex[0];
+  JSAMPROW colorindex1 = cquantize->colorindex[1];
+  JSAMPROW colorindex2 = cquantize->colorindex[2];
+  int row;
+  JDIMENSION col;
+  JDIMENSION width = cinfo->output_width;
+
+  for (row = 0; row < num_rows; row++) {
+    ptrin = input_buf[row];
+    ptrout = output_buf[row];
+    for (col = width; col > 0; col--) {
+      pixcode  = GETJSAMPLE(colorindex0[GETJSAMPLE(*ptrin++)]);
+      pixcode += GETJSAMPLE(colorindex1[GETJSAMPLE(*ptrin++)]);
+      pixcode += GETJSAMPLE(colorindex2[GETJSAMPLE(*ptrin++)]);
+      *ptrout++ = (JSAMPLE) pixcode;
+    }
+  }
+}
+
+
+METHODDEF(void)
+quantize_ord_dither (j_decompress_ptr cinfo, JSAMPARRAY input_buf,
+		     JSAMPARRAY output_buf, int num_rows)
+/* General case, with ordered dithering */
+{
+  my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
+  register JSAMPROW input_ptr;
+  register JSAMPROW output_ptr;
+  JSAMPROW colorindex_ci;
+  int * dither;			/* points to active row of dither matrix */
+  int row_index, col_index;	/* current indexes into dither matrix */
+  int nc = cinfo->out_color_components;
+  int ci;
+  int row;
+  JDIMENSION col;
+  JDIMENSION width = cinfo->output_width;
+
+  for (row = 0; row < num_rows; row++) {
+    /* Initialize output values to 0 so can process components separately */
+    jzero_far((void FAR *) output_buf[row],
+	      (size_t) (width * SIZEOF(JSAMPLE)));
+    row_index = cquantize->row_index;
+    for (ci = 0; ci < nc; ci++) {
+      input_ptr = input_buf[row] + ci;
+      output_ptr = output_buf[row];
+      colorindex_ci = cquantize->colorindex[ci];
+      dither = cquantize->odither[ci][row_index];
+      col_index = 0;
+
+      for (col = width; col > 0; col--) {
+	/* Form pixel value + dither, range-limit to 0..MAXJSAMPLE,
+	 * select output value, accumulate into output code for this pixel.
+	 * Range-limiting need not be done explicitly, as we have extended
+	 * the colorindex table to produce the right answers for out-of-range
+	 * inputs.  The maximum dither is +- MAXJSAMPLE; this sets the
+	 * required amount of padding.
+	 */
+	*output_ptr += colorindex_ci[GETJSAMPLE(*input_ptr)+dither[col_index]];
+	input_ptr += nc;
+	output_ptr++;
+	col_index = (col_index + 1) & ODITHER_MASK;
+      }
+    }
+    /* Advance row index for next row */
+    row_index = (row_index + 1) & ODITHER_MASK;
+    cquantize->row_index = row_index;
+  }
+}
+
+
+METHODDEF(void)
+quantize3_ord_dither (j_decompress_ptr cinfo, JSAMPARRAY input_buf,
+		      JSAMPARRAY output_buf, int num_rows)
+/* Fast path for out_color_components==3, with ordered dithering */
+{
+  my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
+  register int pixcode;
+  register JSAMPROW input_ptr;
+  register JSAMPROW output_ptr;
+  JSAMPROW colorindex0 = cquantize->colorindex[0];
+  JSAMPROW colorindex1 = cquantize->colorindex[1];
+  JSAMPROW colorindex2 = cquantize->colorindex[2];
+  int * dither0;		/* points to active row of dither matrix */
+  int * dither1;
+  int * dither2;
+  int row_index, col_index;	/* current indexes into dither matrix */
+  int row;
+  JDIMENSION col;
+  JDIMENSION width = cinfo->output_width;
+
+  for (row = 0; row < num_rows; row++) {
+    row_index = cquantize->row_index;
+    input_ptr = input_buf[row];
+    output_ptr = output_buf[row];
+    dither0 = cquantize->odither[0][row_index];
+    dither1 = cquantize->odither[1][row_index];
+    dither2 = cquantize->odither[2][row_index];
+    col_index = 0;
+
+    for (col = width; col > 0; col--) {
+      pixcode  = GETJSAMPLE(colorindex0[GETJSAMPLE(*input_ptr++) +
+					dither0[col_index]]);
+      pixcode += GETJSAMPLE(colorindex1[GETJSAMPLE(*input_ptr++) +
+					dither1[col_index]]);
+      pixcode += GETJSAMPLE(colorindex2[GETJSAMPLE(*input_ptr++) +
+					dither2[col_index]]);
+      *output_ptr++ = (JSAMPLE) pixcode;
+      col_index = (col_index + 1) & ODITHER_MASK;
+    }
+    row_index = (row_index + 1) & ODITHER_MASK;
+    cquantize->row_index = row_index;
+  }
+}
+
+
+METHODDEF(void)
+quantize_fs_dither (j_decompress_ptr cinfo, JSAMPARRAY input_buf,
+		    JSAMPARRAY output_buf, int num_rows)
+/* General case, with Floyd-Steinberg dithering */
+{
+  my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
+  register LOCFSERROR cur;	/* current error or pixel value */
+  LOCFSERROR belowerr;		/* error for pixel below cur */
+  LOCFSERROR bpreverr;		/* error for below/prev col */
+  LOCFSERROR bnexterr;		/* error for below/next col */
+  LOCFSERROR delta;
+  register FSERRPTR errorptr;	/* => fserrors[] at column before current */
+  register JSAMPROW input_ptr;
+  register JSAMPROW output_ptr;
+  JSAMPROW colorindex_ci;
+  JSAMPROW colormap_ci;
+  int pixcode;
+  int nc = cinfo->out_color_components;
+  int dir;			/* 1 for left-to-right, -1 for right-to-left */
+  int dirnc;			/* dir * nc */
+  int ci;
+  int row;
+  JDIMENSION col;
+  JDIMENSION width = cinfo->output_width;
+  JSAMPLE *range_limit = cinfo->sample_range_limit;
+  SHIFT_TEMPS
+
+  for (row = 0; row < num_rows; row++) {
+    /* Initialize output values to 0 so can process components separately */
+    jzero_far((void FAR *) output_buf[row],
+	      (size_t) (width * SIZEOF(JSAMPLE)));
+    for (ci = 0; ci < nc; ci++) {
+      input_ptr = input_buf[row] + ci;
+      output_ptr = output_buf[row];
+      if (cquantize->on_odd_row) {
+	/* work right to left in this row */
+	input_ptr += (width-1) * nc; /* so point to rightmost pixel */
+	output_ptr += width-1;
+	dir = -1;
+	dirnc = -nc;
+	errorptr = cquantize->fserrors[ci] + (width+1); /* => entry after last column */
+      } else {
+	/* work left to right in this row */
+	dir = 1;
+	dirnc = nc;
+	errorptr = cquantize->fserrors[ci]; /* => entry before first column */
+      }
+      colorindex_ci = cquantize->colorindex[ci];
+      colormap_ci = cquantize->sv_colormap[ci];
+      /* Preset error values: no error propagated to first pixel from left */
+      cur = 0;
+      /* and no error propagated to row below yet */
+      belowerr = bpreverr = 0;
+
+      for (col = width; col > 0; col--) {
+	/* cur holds the error propagated from the previous pixel on the
+	 * current line.  Add the error propagated from the previous line
+	 * to form the complete error correction term for this pixel, and
+	 * round the error term (which is expressed * 16) to an integer.
+	 * RIGHT_SHIFT rounds towards minus infinity, so adding 8 is correct
+	 * for either sign of the error value.
+	 * Note: errorptr points to *previous* column's array entry.
+	 */
+	cur = RIGHT_SHIFT(cur + errorptr[dir] + 8, 4);
+	/* Form pixel value + error, and range-limit to 0..MAXJSAMPLE.
+	 * The maximum error is +- MAXJSAMPLE; this sets the required size
+	 * of the range_limit array.
+	 */
+	cur += GETJSAMPLE(*input_ptr);
+	cur = GETJSAMPLE(range_limit[cur]);
+	/* Select output value, accumulate into output code for this pixel */
+	pixcode = GETJSAMPLE(colorindex_ci[cur]);
+	*output_ptr += (JSAMPLE) pixcode;
+	/* Compute actual representation error at this pixel */
+	/* Note: we can do this even though we don't have the final */
+	/* pixel code, because the colormap is orthogonal. */
+	cur -= GETJSAMPLE(colormap_ci[pixcode]);
+	/* Compute error fractions to be propagated to adjacent pixels.
+	 * Add these into the running sums, and simultaneously shift the
+	 * next-line error sums left by 1 column.
+	 */
+	bnexterr = cur;
+	delta = cur * 2;
+	cur += delta;		/* form error * 3 */
+	errorptr[0] = (FSERROR) (bpreverr + cur);
+	cur += delta;		/* form error * 5 */
+	bpreverr = belowerr + cur;
+	belowerr = bnexterr;
+	cur += delta;		/* form error * 7 */
+	/* At this point cur contains the 7/16 error value to be propagated
+	 * to the next pixel on the current line, and all the errors for the
+	 * next line have been shifted over. We are therefore ready to move on.
+	 */
+	input_ptr += dirnc;	/* advance input ptr to next column */
+	output_ptr += dir;	/* advance output ptr to next column */
+	errorptr += dir;	/* advance errorptr to current column */
+      }
+      /* Post-loop cleanup: we must unload the final error value into the
+       * final fserrors[] entry.  Note we need not unload belowerr because
+       * it is for the dummy column before or after the actual array.
+       */
+      errorptr[0] = (FSERROR) bpreverr; /* unload prev err into array */
+    }
+    cquantize->on_odd_row = (cquantize->on_odd_row ? FALSE : TRUE);
+  }
+}
+
+
+/*
+ * Allocate workspace for Floyd-Steinberg errors.
+ */
+
+LOCAL(void)
+alloc_fs_workspace (j_decompress_ptr cinfo)
+{
+  my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
+  size_t arraysize;
+  int i;
+
+  arraysize = (size_t) ((cinfo->output_width + 2) * SIZEOF(FSERROR));
+  for (i = 0; i < cinfo->out_color_components; i++) {
+    cquantize->fserrors[i] = (FSERRPTR)
+      (*cinfo->mem->alloc_large)((j_common_ptr) cinfo, JPOOL_IMAGE, arraysize);
+  }
+}
+
+
+/*
+ * Initialize for one-pass color quantization.
+ */
+
+METHODDEF(void)
+start_pass_1_quant (j_decompress_ptr cinfo, boolean is_pre_scan)
+{
+  my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
+  size_t arraysize;
+  int i;
+
+  /* Install my colormap. */
+  cinfo->colormap = cquantize->sv_colormap;
+  cinfo->actual_number_of_colors = cquantize->sv_actual;
+
+  /* Initialize for desired dithering mode. */
+  switch (cinfo->dither_mode) {
+  case JDITHER_NONE:
+    if (cinfo->out_color_components == 3)
+      cquantize->pub.color_quantize = color_quantize3;
+    else
+      cquantize->pub.color_quantize = color_quantize;
+    break;
+  case JDITHER_ORDERED:
+    if (cinfo->out_color_components == 3)
+      cquantize->pub.color_quantize = quantize3_ord_dither;
+    else
+      cquantize->pub.color_quantize = quantize_ord_dither;
+    cquantize->row_index = 0;	/* initialize state for ordered dither */
+    /* If user changed to ordered dither from another mode,
+     * we must recreate the color index table with padding.
+     * This will cost extra space, but probably isn't very likely.
+     */
+    if (! cquantize->is_padded)
+      create_colorindex(cinfo);
+    /* Create ordered-dither tables if we didn't already. */
+    if (cquantize->odither[0] == NULL)
+      create_odither_tables(cinfo);
+    break;
+  case JDITHER_FS:
+    cquantize->pub.color_quantize = quantize_fs_dither;
+    cquantize->on_odd_row = FALSE; /* initialize state for F-S dither */
+    /* Allocate Floyd-Steinberg workspace if didn't already. */
+    if (cquantize->fserrors[0] == NULL)
+      alloc_fs_workspace(cinfo);
+    /* Initialize the propagated errors to zero. */
+    arraysize = (size_t) ((cinfo->output_width + 2) * SIZEOF(FSERROR));
+    for (i = 0; i < cinfo->out_color_components; i++)
+      jzero_far((void FAR *) cquantize->fserrors[i], arraysize);
+    break;
+  default:
+    ERREXIT(cinfo, JERR_NOT_COMPILED);
+    break;
+  }
+}
+
+
+/*
+ * Finish up at the end of the pass.
+ */
+
+METHODDEF(void)
+finish_pass_1_quant (j_decompress_ptr cinfo)
+{
+  /* no work in 1-pass case */
+}
+
+
+/*
+ * Switch to a new external colormap between output passes.
+ * Shouldn't get to this module!
+ */
+
+METHODDEF(void)
+new_color_map_1_quant (j_decompress_ptr cinfo)
+{
+  ERREXIT(cinfo, JERR_MODE_CHANGE);
+}
+
+
+/*
+ * Module initialization routine for 1-pass color quantization.
+ */
+
+GLOBAL(void)
+jinit_1pass_quantizer (j_decompress_ptr cinfo)
+{
+  my_cquantize_ptr cquantize;
+
+  cquantize = (my_cquantize_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				SIZEOF(my_cquantizer));
+  cinfo->cquantize = (struct jpeg_color_quantizer *) cquantize;
+  cquantize->pub.start_pass = start_pass_1_quant;
+  cquantize->pub.finish_pass = finish_pass_1_quant;
+  cquantize->pub.new_color_map = new_color_map_1_quant;
+  cquantize->fserrors[0] = NULL; /* Flag FS workspace not allocated */
+  cquantize->odither[0] = NULL;	/* Also flag odither arrays not allocated */
+
+  /* Make sure my internal arrays won't overflow */
+  if (cinfo->out_color_components > MAX_Q_COMPS)
+    ERREXIT1(cinfo, JERR_QUANT_COMPONENTS, MAX_Q_COMPS);
+  /* Make sure colormap indexes can be represented by JSAMPLEs */
+  if (cinfo->desired_number_of_colors > (MAXJSAMPLE+1))
+    ERREXIT1(cinfo, JERR_QUANT_MANY_COLORS, MAXJSAMPLE+1);
+
+  /* Create the colormap and color index table. */
+  create_colormap(cinfo);
+  create_colorindex(cinfo);
+
+  /* Allocate Floyd-Steinberg workspace now if requested.
+   * We do this now since it is FAR storage and may affect the memory
+   * manager's space calculations.  If the user changes to FS dither
+   * mode in a later pass, we will allocate the space then, and will
+   * possibly overrun the max_memory_to_use setting.
+   */
+  if (cinfo->dither_mode == JDITHER_FS)
+    alloc_fs_workspace(cinfo);
+}
+
+#endif /* QUANT_1PASS_SUPPORTED */
diff --git a/src/libjpeg-turbo/jquant2.c b/src/libjpeg-turbo/jquant2.c
new file mode 100644
index 0000000..da964f7
--- /dev/null
+++ b/src/libjpeg-turbo/jquant2.c
@@ -0,0 +1,1293 @@
+/*
+ * jquant2.c
+ *
+ * Copyright (C) 1991-1996, Thomas G. Lane.
+ * Copyright (C) 2009, D. R. Commander.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains 2-pass color quantization (color mapping) routines.
+ * These routines provide selection of a custom color map for an image,
+ * followed by mapping of the image to that color map, with optional
+ * Floyd-Steinberg dithering.
+ * It is also possible to use just the second pass to map to an arbitrary
+ * externally-given color map.
+ *
+ * Note: ordered dithering is not supported, since there isn't any fast
+ * way to compute intercolor distances; it's unclear that ordered dither's
+ * fundamental assumptions even hold with an irregularly spaced color map.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+
+#ifdef QUANT_2PASS_SUPPORTED
+
+
+/*
+ * This module implements the well-known Heckbert paradigm for color
+ * quantization.  Most of the ideas used here can be traced back to
+ * Heckbert's seminal paper
+ *   Heckbert, Paul.  "Color Image Quantization for Frame Buffer Display",
+ *   Proc. SIGGRAPH '82, Computer Graphics v.16 #3 (July 1982), pp 297-304.
+ *
+ * In the first pass over the image, we accumulate a histogram showing the
+ * usage count of each possible color.  To keep the histogram to a reasonable
+ * size, we reduce the precision of the input; typical practice is to retain
+ * 5 or 6 bits per color, so that 8 or 4 different input values are counted
+ * in the same histogram cell.
+ *
+ * Next, the color-selection step begins with a box representing the whole
+ * color space, and repeatedly splits the "largest" remaining box until we
+ * have as many boxes as desired colors.  Then the mean color in each
+ * remaining box becomes one of the possible output colors.
+ * 
+ * The second pass over the image maps each input pixel to the closest output
+ * color (optionally after applying a Floyd-Steinberg dithering correction).
+ * This mapping is logically trivial, but making it go fast enough requires
+ * considerable care.
+ *
+ * Heckbert-style quantizers vary a good deal in their policies for choosing
+ * the "largest" box and deciding where to cut it.  The particular policies
+ * used here have proved out well in experimental comparisons, but better ones
+ * may yet be found.
+ *
+ * In earlier versions of the IJG code, this module quantized in YCbCr color
+ * space, processing the raw upsampled data without a color conversion step.
+ * This allowed the color conversion math to be done only once per colormap
+ * entry, not once per pixel.  However, that optimization precluded other
+ * useful optimizations (such as merging color conversion with upsampling)
+ * and it also interfered with desired capabilities such as quantizing to an
+ * externally-supplied colormap.  We have therefore abandoned that approach.
+ * The present code works in the post-conversion color space, typically RGB.
+ *
+ * To improve the visual quality of the results, we actually work in scaled
+ * RGB space, giving G distances more weight than R, and R in turn more than
+ * B.  To do everything in integer math, we must use integer scale factors.
+ * The 2/3/1 scale factors used here correspond loosely to the relative
+ * weights of the colors in the NTSC grayscale equation.
+ * If you want to use this code to quantize a non-RGB color space, you'll
+ * probably need to change these scale factors.
+ */
+
+#define R_SCALE 2		/* scale R distances by this much */
+#define G_SCALE 3		/* scale G distances by this much */
+#define B_SCALE 1		/* and B by this much */
+
+static const int c_scales[3]={R_SCALE, G_SCALE, B_SCALE};
+#define C0_SCALE c_scales[rgb_red[cinfo->out_color_space]]
+#define C1_SCALE c_scales[rgb_green[cinfo->out_color_space]]
+#define C2_SCALE c_scales[rgb_blue[cinfo->out_color_space]]
+
+/*
+ * First we have the histogram data structure and routines for creating it.
+ *
+ * The number of bits of precision can be adjusted by changing these symbols.
+ * We recommend keeping 6 bits for G and 5 each for R and B.
+ * If you have plenty of memory and cycles, 6 bits all around gives marginally
+ * better results; if you are short of memory, 5 bits all around will save
+ * some space but degrade the results.
+ * To maintain a fully accurate histogram, we'd need to allocate a "long"
+ * (preferably unsigned long) for each cell.  In practice this is overkill;
+ * we can get by with 16 bits per cell.  Few of the cell counts will overflow,
+ * and clamping those that do overflow to the maximum value will give close-
+ * enough results.  This reduces the recommended histogram size from 256Kb
+ * to 128Kb, which is a useful savings on PC-class machines.
+ * (In the second pass the histogram space is re-used for pixel mapping data;
+ * in that capacity, each cell must be able to store zero to the number of
+ * desired colors.  16 bits/cell is plenty for that too.)
+ * Since the JPEG code is intended to run in small memory model on 80x86
+ * machines, we can't just allocate the histogram in one chunk.  Instead
+ * of a true 3-D array, we use a row of pointers to 2-D arrays.  Each
+ * pointer corresponds to a C0 value (typically 2^5 = 32 pointers) and
+ * each 2-D array has 2^6*2^5 = 2048 or 2^6*2^6 = 4096 entries.  Note that
+ * on 80x86 machines, the pointer row is in near memory but the actual
+ * arrays are in far memory (same arrangement as we use for image arrays).
+ */
+
+#define MAXNUMCOLORS  (MAXJSAMPLE+1) /* maximum size of colormap */
+
+/* These will do the right thing for either R,G,B or B,G,R color order,
+ * but you may not like the results for other color orders.
+ */
+#define HIST_C0_BITS  5		/* bits of precision in R/B histogram */
+#define HIST_C1_BITS  6		/* bits of precision in G histogram */
+#define HIST_C2_BITS  5		/* bits of precision in B/R histogram */
+
+/* Number of elements along histogram axes. */
+#define HIST_C0_ELEMS  (1<<HIST_C0_BITS)
+#define HIST_C1_ELEMS  (1<<HIST_C1_BITS)
+#define HIST_C2_ELEMS  (1<<HIST_C2_BITS)
+
+/* These are the amounts to shift an input value to get a histogram index. */
+#define C0_SHIFT  (BITS_IN_JSAMPLE-HIST_C0_BITS)
+#define C1_SHIFT  (BITS_IN_JSAMPLE-HIST_C1_BITS)
+#define C2_SHIFT  (BITS_IN_JSAMPLE-HIST_C2_BITS)
+
+
+typedef UINT16 histcell;	/* histogram cell; prefer an unsigned type */
+
+typedef histcell FAR * histptr;	/* for pointers to histogram cells */
+
+typedef histcell hist1d[HIST_C2_ELEMS]; /* typedefs for the array */
+typedef hist1d FAR * hist2d;	/* type for the 2nd-level pointers */
+typedef hist2d * hist3d;	/* type for top-level pointer */
+
+
+/* Declarations for Floyd-Steinberg dithering.
+ *
+ * Errors are accumulated into the array fserrors[], at a resolution of
+ * 1/16th of a pixel count.  The error at a given pixel is propagated
+ * to its not-yet-processed neighbors using the standard F-S fractions,
+ *		...	(here)	7/16
+ *		3/16	5/16	1/16
+ * We work left-to-right on even rows, right-to-left on odd rows.
+ *
+ * We can get away with a single array (holding one row's worth of errors)
+ * by using it to store the current row's errors at pixel columns not yet
+ * processed, but the next row's errors at columns already processed.  We
+ * need only a few extra variables to hold the errors immediately around the
+ * current column.  (If we are lucky, those variables are in registers, but
+ * even if not, they're probably cheaper to access than array elements are.)
+ *
+ * The fserrors[] array has (#columns + 2) entries; the extra entry at
+ * each end saves us from special-casing the first and last pixels.
+ * Each entry is three values long, one value for each color component.
+ *
+ * Note: on a wide image, we might not have enough room in a PC's near data
+ * segment to hold the error array; so it is allocated with alloc_large.
+ */
+
+#if BITS_IN_JSAMPLE == 8
+typedef INT16 FSERROR;		/* 16 bits should be enough */
+typedef int LOCFSERROR;		/* use 'int' for calculation temps */
+#else
+typedef INT32 FSERROR;		/* may need more than 16 bits */
+typedef INT32 LOCFSERROR;	/* be sure calculation temps are big enough */
+#endif
+
+typedef FSERROR FAR *FSERRPTR;	/* pointer to error array (in FAR storage!) */
+
+
+/* Private subobject */
+
+typedef struct {
+  struct jpeg_color_quantizer pub; /* public fields */
+
+  /* Space for the eventually created colormap is stashed here */
+  JSAMPARRAY sv_colormap;	/* colormap allocated at init time */
+  int desired;			/* desired # of colors = size of colormap */
+
+  /* Variables for accumulating image statistics */
+  hist3d histogram;		/* pointer to the histogram */
+
+  boolean needs_zeroed;		/* TRUE if next pass must zero histogram */
+
+  /* Variables for Floyd-Steinberg dithering */
+  FSERRPTR fserrors;		/* accumulated errors */
+  boolean on_odd_row;		/* flag to remember which row we are on */
+  int * error_limiter;		/* table for clamping the applied error */
+} my_cquantizer;
+
+typedef my_cquantizer * my_cquantize_ptr;
+
+
+/*
+ * Prescan some rows of pixels.
+ * In this module the prescan simply updates the histogram, which has been
+ * initialized to zeroes by start_pass.
+ * An output_buf parameter is required by the method signature, but no data
+ * is actually output (in fact the buffer controller is probably passing a
+ * NULL pointer).
+ */
+
+METHODDEF(void)
+prescan_quantize (j_decompress_ptr cinfo, JSAMPARRAY input_buf,
+		  JSAMPARRAY output_buf, int num_rows)
+{
+  my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
+  register JSAMPROW ptr;
+  register histptr histp;
+  register hist3d histogram = cquantize->histogram;
+  int row;
+  JDIMENSION col;
+  JDIMENSION width = cinfo->output_width;
+
+  for (row = 0; row < num_rows; row++) {
+    ptr = input_buf[row];
+    for (col = width; col > 0; col--) {
+      /* get pixel value and index into the histogram */
+      histp = & histogram[GETJSAMPLE(ptr[0]) >> C0_SHIFT]
+			 [GETJSAMPLE(ptr[1]) >> C1_SHIFT]
+			 [GETJSAMPLE(ptr[2]) >> C2_SHIFT];
+      /* increment, check for overflow and undo increment if so. */
+      if (++(*histp) <= 0)
+	(*histp)--;
+      ptr += 3;
+    }
+  }
+}
+
+
+/*
+ * Next we have the really interesting routines: selection of a colormap
+ * given the completed histogram.
+ * These routines work with a list of "boxes", each representing a rectangular
+ * subset of the input color space (to histogram precision).
+ */
+
+typedef struct {
+  /* The bounds of the box (inclusive); expressed as histogram indexes */
+  int c0min, c0max;
+  int c1min, c1max;
+  int c2min, c2max;
+  /* The volume (actually 2-norm) of the box */
+  INT32 volume;
+  /* The number of nonzero histogram cells within this box */
+  long colorcount;
+} box;
+
+typedef box * boxptr;
+
+
+LOCAL(boxptr)
+find_biggest_color_pop (boxptr boxlist, int numboxes)
+/* Find the splittable box with the largest color population */
+/* Returns NULL if no splittable boxes remain */
+{
+  register boxptr boxp;
+  register int i;
+  register long maxc = 0;
+  boxptr which = NULL;
+  
+  for (i = 0, boxp = boxlist; i < numboxes; i++, boxp++) {
+    if (boxp->colorcount > maxc && boxp->volume > 0) {
+      which = boxp;
+      maxc = boxp->colorcount;
+    }
+  }
+  return which;
+}
+
+
+LOCAL(boxptr)
+find_biggest_volume (boxptr boxlist, int numboxes)
+/* Find the splittable box with the largest (scaled) volume */
+/* Returns NULL if no splittable boxes remain */
+{
+  register boxptr boxp;
+  register int i;
+  register INT32 maxv = 0;
+  boxptr which = NULL;
+  
+  for (i = 0, boxp = boxlist; i < numboxes; i++, boxp++) {
+    if (boxp->volume > maxv) {
+      which = boxp;
+      maxv = boxp->volume;
+    }
+  }
+  return which;
+}
+
+
+LOCAL(void)
+update_box (j_decompress_ptr cinfo, boxptr boxp)
+/* Shrink the min/max bounds of a box to enclose only nonzero elements, */
+/* and recompute its volume and population */
+{
+  my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
+  hist3d histogram = cquantize->histogram;
+  histptr histp;
+  int c0,c1,c2;
+  int c0min,c0max,c1min,c1max,c2min,c2max;
+  INT32 dist0,dist1,dist2;
+  long ccount;
+  
+  c0min = boxp->c0min;  c0max = boxp->c0max;
+  c1min = boxp->c1min;  c1max = boxp->c1max;
+  c2min = boxp->c2min;  c2max = boxp->c2max;
+  
+  if (c0max > c0min)
+    for (c0 = c0min; c0 <= c0max; c0++)
+      for (c1 = c1min; c1 <= c1max; c1++) {
+	histp = & histogram[c0][c1][c2min];
+	for (c2 = c2min; c2 <= c2max; c2++)
+	  if (*histp++ != 0) {
+	    boxp->c0min = c0min = c0;
+	    goto have_c0min;
+	  }
+      }
+ have_c0min:
+  if (c0max > c0min)
+    for (c0 = c0max; c0 >= c0min; c0--)
+      for (c1 = c1min; c1 <= c1max; c1++) {
+	histp = & histogram[c0][c1][c2min];
+	for (c2 = c2min; c2 <= c2max; c2++)
+	  if (*histp++ != 0) {
+	    boxp->c0max = c0max = c0;
+	    goto have_c0max;
+	  }
+      }
+ have_c0max:
+  if (c1max > c1min)
+    for (c1 = c1min; c1 <= c1max; c1++)
+      for (c0 = c0min; c0 <= c0max; c0++) {
+	histp = & histogram[c0][c1][c2min];
+	for (c2 = c2min; c2 <= c2max; c2++)
+	  if (*histp++ != 0) {
+	    boxp->c1min = c1min = c1;
+	    goto have_c1min;
+	  }
+      }
+ have_c1min:
+  if (c1max > c1min)
+    for (c1 = c1max; c1 >= c1min; c1--)
+      for (c0 = c0min; c0 <= c0max; c0++) {
+	histp = & histogram[c0][c1][c2min];
+	for (c2 = c2min; c2 <= c2max; c2++)
+	  if (*histp++ != 0) {
+	    boxp->c1max = c1max = c1;
+	    goto have_c1max;
+	  }
+      }
+ have_c1max:
+  if (c2max > c2min)
+    for (c2 = c2min; c2 <= c2max; c2++)
+      for (c0 = c0min; c0 <= c0max; c0++) {
+	histp = & histogram[c0][c1min][c2];
+	for (c1 = c1min; c1 <= c1max; c1++, histp += HIST_C2_ELEMS)
+	  if (*histp != 0) {
+	    boxp->c2min = c2min = c2;
+	    goto have_c2min;
+	  }
+      }
+ have_c2min:
+  if (c2max > c2min)
+    for (c2 = c2max; c2 >= c2min; c2--)
+      for (c0 = c0min; c0 <= c0max; c0++) {
+	histp = & histogram[c0][c1min][c2];
+	for (c1 = c1min; c1 <= c1max; c1++, histp += HIST_C2_ELEMS)
+	  if (*histp != 0) {
+	    boxp->c2max = c2max = c2;
+	    goto have_c2max;
+	  }
+      }
+ have_c2max:
+
+  /* Update box volume.
+   * We use 2-norm rather than real volume here; this biases the method
+   * against making long narrow boxes, and it has the side benefit that
+   * a box is splittable iff norm > 0.
+   * Since the differences are expressed in histogram-cell units,
+   * we have to shift back to JSAMPLE units to get consistent distances;
+   * after which, we scale according to the selected distance scale factors.
+   */
+  dist0 = ((c0max - c0min) << C0_SHIFT) * C0_SCALE;
+  dist1 = ((c1max - c1min) << C1_SHIFT) * C1_SCALE;
+  dist2 = ((c2max - c2min) << C2_SHIFT) * C2_SCALE;
+  boxp->volume = dist0*dist0 + dist1*dist1 + dist2*dist2;
+  
+  /* Now scan remaining volume of box and compute population */
+  ccount = 0;
+  for (c0 = c0min; c0 <= c0max; c0++)
+    for (c1 = c1min; c1 <= c1max; c1++) {
+      histp = & histogram[c0][c1][c2min];
+      for (c2 = c2min; c2 <= c2max; c2++, histp++)
+	if (*histp != 0) {
+	  ccount++;
+	}
+    }
+  boxp->colorcount = ccount;
+}
+
+
+LOCAL(int)
+median_cut (j_decompress_ptr cinfo, boxptr boxlist, int numboxes,
+	    int desired_colors)
+/* Repeatedly select and split the largest box until we have enough boxes */
+{
+  int n,lb;
+  int c0,c1,c2,cmax;
+  register boxptr b1,b2;
+
+  while (numboxes < desired_colors) {
+    /* Select box to split.
+     * Current algorithm: by population for first half, then by volume.
+     */
+    if (numboxes*2 <= desired_colors) {
+      b1 = find_biggest_color_pop(boxlist, numboxes);
+    } else {
+      b1 = find_biggest_volume(boxlist, numboxes);
+    }
+    if (b1 == NULL)		/* no splittable boxes left! */
+      break;
+    b2 = &boxlist[numboxes];	/* where new box will go */
+    /* Copy the color bounds to the new box. */
+    b2->c0max = b1->c0max; b2->c1max = b1->c1max; b2->c2max = b1->c2max;
+    b2->c0min = b1->c0min; b2->c1min = b1->c1min; b2->c2min = b1->c2min;
+    /* Choose which axis to split the box on.
+     * Current algorithm: longest scaled axis.
+     * See notes in update_box about scaling distances.
+     */
+    c0 = ((b1->c0max - b1->c0min) << C0_SHIFT) * C0_SCALE;
+    c1 = ((b1->c1max - b1->c1min) << C1_SHIFT) * C1_SCALE;
+    c2 = ((b1->c2max - b1->c2min) << C2_SHIFT) * C2_SCALE;
+    /* We want to break any ties in favor of green, then red, blue last.
+     * This code does the right thing for R,G,B or B,G,R color orders only.
+     */
+    if (rgb_red[cinfo->out_color_space] == 0) {
+      cmax = c1; n = 1;
+      if (c0 > cmax) { cmax = c0; n = 0; }
+      if (c2 > cmax) { n = 2; }
+    }
+    else {
+      cmax = c1; n = 1;
+      if (c2 > cmax) { cmax = c2; n = 2; }
+      if (c0 > cmax) { n = 0; }
+    }
+    /* Choose split point along selected axis, and update box bounds.
+     * Current algorithm: split at halfway point.
+     * (Since the box has been shrunk to minimum volume,
+     * any split will produce two nonempty subboxes.)
+     * Note that lb value is max for lower box, so must be < old max.
+     */
+    switch (n) {
+    case 0:
+      lb = (b1->c0max + b1->c0min) / 2;
+      b1->c0max = lb;
+      b2->c0min = lb+1;
+      break;
+    case 1:
+      lb = (b1->c1max + b1->c1min) / 2;
+      b1->c1max = lb;
+      b2->c1min = lb+1;
+      break;
+    case 2:
+      lb = (b1->c2max + b1->c2min) / 2;
+      b1->c2max = lb;
+      b2->c2min = lb+1;
+      break;
+    }
+    /* Update stats for boxes */
+    update_box(cinfo, b1);
+    update_box(cinfo, b2);
+    numboxes++;
+  }
+  return numboxes;
+}
+
+
+LOCAL(void)
+compute_color (j_decompress_ptr cinfo, boxptr boxp, int icolor)
+/* Compute representative color for a box, put it in colormap[icolor] */
+{
+  /* Current algorithm: mean weighted by pixels (not colors) */
+  /* Note it is important to get the rounding correct! */
+  my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
+  hist3d histogram = cquantize->histogram;
+  histptr histp;
+  int c0,c1,c2;
+  int c0min,c0max,c1min,c1max,c2min,c2max;
+  long count;
+  long total = 0;
+  long c0total = 0;
+  long c1total = 0;
+  long c2total = 0;
+  
+  c0min = boxp->c0min;  c0max = boxp->c0max;
+  c1min = boxp->c1min;  c1max = boxp->c1max;
+  c2min = boxp->c2min;  c2max = boxp->c2max;
+  
+  for (c0 = c0min; c0 <= c0max; c0++)
+    for (c1 = c1min; c1 <= c1max; c1++) {
+      histp = & histogram[c0][c1][c2min];
+      for (c2 = c2min; c2 <= c2max; c2++) {
+	if ((count = *histp++) != 0) {
+	  total += count;
+	  c0total += ((c0 << C0_SHIFT) + ((1<<C0_SHIFT)>>1)) * count;
+	  c1total += ((c1 << C1_SHIFT) + ((1<<C1_SHIFT)>>1)) * count;
+	  c2total += ((c2 << C2_SHIFT) + ((1<<C2_SHIFT)>>1)) * count;
+	}
+      }
+    }
+  
+  cinfo->colormap[0][icolor] = (JSAMPLE) ((c0total + (total>>1)) / total);
+  cinfo->colormap[1][icolor] = (JSAMPLE) ((c1total + (total>>1)) / total);
+  cinfo->colormap[2][icolor] = (JSAMPLE) ((c2total + (total>>1)) / total);
+}
+
+
+LOCAL(void)
+select_colors (j_decompress_ptr cinfo, int desired_colors)
+/* Master routine for color selection */
+{
+  boxptr boxlist;
+  int numboxes;
+  int i;
+
+  /* Allocate workspace for box list */
+  boxlist = (boxptr) (*cinfo->mem->alloc_small)
+    ((j_common_ptr) cinfo, JPOOL_IMAGE, desired_colors * SIZEOF(box));
+  /* Initialize one box containing whole space */
+  numboxes = 1;
+  boxlist[0].c0min = 0;
+  boxlist[0].c0max = MAXJSAMPLE >> C0_SHIFT;
+  boxlist[0].c1min = 0;
+  boxlist[0].c1max = MAXJSAMPLE >> C1_SHIFT;
+  boxlist[0].c2min = 0;
+  boxlist[0].c2max = MAXJSAMPLE >> C2_SHIFT;
+  /* Shrink it to actually-used volume and set its statistics */
+  update_box(cinfo, & boxlist[0]);
+  /* Perform median-cut to produce final box list */
+  numboxes = median_cut(cinfo, boxlist, numboxes, desired_colors);
+  /* Compute the representative color for each box, fill colormap */
+  for (i = 0; i < numboxes; i++)
+    compute_color(cinfo, & boxlist[i], i);
+  cinfo->actual_number_of_colors = numboxes;
+  TRACEMS1(cinfo, 1, JTRC_QUANT_SELECTED, numboxes);
+}
+
+
+/*
+ * These routines are concerned with the time-critical task of mapping input
+ * colors to the nearest color in the selected colormap.
+ *
+ * We re-use the histogram space as an "inverse color map", essentially a
+ * cache for the results of nearest-color searches.  All colors within a
+ * histogram cell will be mapped to the same colormap entry, namely the one
+ * closest to the cell's center.  This may not be quite the closest entry to
+ * the actual input color, but it's almost as good.  A zero in the cache
+ * indicates we haven't found the nearest color for that cell yet; the array
+ * is cleared to zeroes before starting the mapping pass.  When we find the
+ * nearest color for a cell, its colormap index plus one is recorded in the
+ * cache for future use.  The pass2 scanning routines call fill_inverse_cmap
+ * when they need to use an unfilled entry in the cache.
+ *
+ * Our method of efficiently finding nearest colors is based on the "locally
+ * sorted search" idea described by Heckbert and on the incremental distance
+ * calculation described by Spencer W. Thomas in chapter III.1 of Graphics
+ * Gems II (James Arvo, ed.  Academic Press, 1991).  Thomas points out that
+ * the distances from a given colormap entry to each cell of the histogram can
+ * be computed quickly using an incremental method: the differences between
+ * distances to adjacent cells themselves differ by a constant.  This allows a
+ * fairly fast implementation of the "brute force" approach of computing the
+ * distance from every colormap entry to every histogram cell.  Unfortunately,
+ * it needs a work array to hold the best-distance-so-far for each histogram
+ * cell (because the inner loop has to be over cells, not colormap entries).
+ * The work array elements have to be INT32s, so the work array would need
+ * 256Kb at our recommended precision.  This is not feasible in DOS machines.
+ *
+ * To get around these problems, we apply Thomas' method to compute the
+ * nearest colors for only the cells within a small subbox of the histogram.
+ * The work array need be only as big as the subbox, so the memory usage
+ * problem is solved.  Furthermore, we need not fill subboxes that are never
+ * referenced in pass2; many images use only part of the color gamut, so a
+ * fair amount of work is saved.  An additional advantage of this
+ * approach is that we can apply Heckbert's locality criterion to quickly
+ * eliminate colormap entries that are far away from the subbox; typically
+ * three-fourths of the colormap entries are rejected by Heckbert's criterion,
+ * and we need not compute their distances to individual cells in the subbox.
+ * The speed of this approach is heavily influenced by the subbox size: too
+ * small means too much overhead, too big loses because Heckbert's criterion
+ * can't eliminate as many colormap entries.  Empirically the best subbox
+ * size seems to be about 1/512th of the histogram (1/8th in each direction).
+ *
+ * Thomas' article also describes a refined method which is asymptotically
+ * faster than the brute-force method, but it is also far more complex and
+ * cannot efficiently be applied to small subboxes.  It is therefore not
+ * useful for programs intended to be portable to DOS machines.  On machines
+ * with plenty of memory, filling the whole histogram in one shot with Thomas'
+ * refined method might be faster than the present code --- but then again,
+ * it might not be any faster, and it's certainly more complicated.
+ */
+
+
+/* log2(histogram cells in update box) for each axis; this can be adjusted */
+#define BOX_C0_LOG  (HIST_C0_BITS-3)
+#define BOX_C1_LOG  (HIST_C1_BITS-3)
+#define BOX_C2_LOG  (HIST_C2_BITS-3)
+
+#define BOX_C0_ELEMS  (1<<BOX_C0_LOG) /* # of hist cells in update box */
+#define BOX_C1_ELEMS  (1<<BOX_C1_LOG)
+#define BOX_C2_ELEMS  (1<<BOX_C2_LOG)
+
+#define BOX_C0_SHIFT  (C0_SHIFT + BOX_C0_LOG)
+#define BOX_C1_SHIFT  (C1_SHIFT + BOX_C1_LOG)
+#define BOX_C2_SHIFT  (C2_SHIFT + BOX_C2_LOG)
+
+
+/*
+ * The next three routines implement inverse colormap filling.  They could
+ * all be folded into one big routine, but splitting them up this way saves
+ * some stack space (the mindist[] and bestdist[] arrays need not coexist)
+ * and may allow some compilers to produce better code by registerizing more
+ * inner-loop variables.
+ */
+
+LOCAL(int)
+find_nearby_colors (j_decompress_ptr cinfo, int minc0, int minc1, int minc2,
+		    JSAMPLE colorlist[])
+/* Locate the colormap entries close enough to an update box to be candidates
+ * for the nearest entry to some cell(s) in the update box.  The update box
+ * is specified by the center coordinates of its first cell.  The number of
+ * candidate colormap entries is returned, and their colormap indexes are
+ * placed in colorlist[].
+ * This routine uses Heckbert's "locally sorted search" criterion to select
+ * the colors that need further consideration.
+ */
+{
+  int numcolors = cinfo->actual_number_of_colors;
+  int maxc0, maxc1, maxc2;
+  int centerc0, centerc1, centerc2;
+  int i, x, ncolors;
+  INT32 minmaxdist, min_dist, max_dist, tdist;
+  INT32 mindist[MAXNUMCOLORS];	/* min distance to colormap entry i */
+
+  /* Compute true coordinates of update box's upper corner and center.
+   * Actually we compute the coordinates of the center of the upper-corner
+   * histogram cell, which are the upper bounds of the volume we care about.
+   * Note that since ">>" rounds down, the "center" values may be closer to
+   * min than to max; hence comparisons to them must be "<=", not "<".
+   */
+  maxc0 = minc0 + ((1 << BOX_C0_SHIFT) - (1 << C0_SHIFT));
+  centerc0 = (minc0 + maxc0) >> 1;
+  maxc1 = minc1 + ((1 << BOX_C1_SHIFT) - (1 << C1_SHIFT));
+  centerc1 = (minc1 + maxc1) >> 1;
+  maxc2 = minc2 + ((1 << BOX_C2_SHIFT) - (1 << C2_SHIFT));
+  centerc2 = (minc2 + maxc2) >> 1;
+
+  /* For each color in colormap, find:
+   *  1. its minimum squared-distance to any point in the update box
+   *     (zero if color is within update box);
+   *  2. its maximum squared-distance to any point in the update box.
+   * Both of these can be found by considering only the corners of the box.
+   * We save the minimum distance for each color in mindist[];
+   * only the smallest maximum distance is of interest.
+   */
+  minmaxdist = 0x7FFFFFFFL;
+
+  for (i = 0; i < numcolors; i++) {
+    /* We compute the squared-c0-distance term, then add in the other two. */
+    x = GETJSAMPLE(cinfo->colormap[0][i]);
+    if (x < minc0) {
+      tdist = (x - minc0) * C0_SCALE;
+      min_dist = tdist*tdist;
+      tdist = (x - maxc0) * C0_SCALE;
+      max_dist = tdist*tdist;
+    } else if (x > maxc0) {
+      tdist = (x - maxc0) * C0_SCALE;
+      min_dist = tdist*tdist;
+      tdist = (x - minc0) * C0_SCALE;
+      max_dist = tdist*tdist;
+    } else {
+      /* within cell range so no contribution to min_dist */
+      min_dist = 0;
+      if (x <= centerc0) {
+	tdist = (x - maxc0) * C0_SCALE;
+	max_dist = tdist*tdist;
+      } else {
+	tdist = (x - minc0) * C0_SCALE;
+	max_dist = tdist*tdist;
+      }
+    }
+
+    x = GETJSAMPLE(cinfo->colormap[1][i]);
+    if (x < minc1) {
+      tdist = (x - minc1) * C1_SCALE;
+      min_dist += tdist*tdist;
+      tdist = (x - maxc1) * C1_SCALE;
+      max_dist += tdist*tdist;
+    } else if (x > maxc1) {
+      tdist = (x - maxc1) * C1_SCALE;
+      min_dist += tdist*tdist;
+      tdist = (x - minc1) * C1_SCALE;
+      max_dist += tdist*tdist;
+    } else {
+      /* within cell range so no contribution to min_dist */
+      if (x <= centerc1) {
+	tdist = (x - maxc1) * C1_SCALE;
+	max_dist += tdist*tdist;
+      } else {
+	tdist = (x - minc1) * C1_SCALE;
+	max_dist += tdist*tdist;
+      }
+    }
+
+    x = GETJSAMPLE(cinfo->colormap[2][i]);
+    if (x < minc2) {
+      tdist = (x - minc2) * C2_SCALE;
+      min_dist += tdist*tdist;
+      tdist = (x - maxc2) * C2_SCALE;
+      max_dist += tdist*tdist;
+    } else if (x > maxc2) {
+      tdist = (x - maxc2) * C2_SCALE;
+      min_dist += tdist*tdist;
+      tdist = (x - minc2) * C2_SCALE;
+      max_dist += tdist*tdist;
+    } else {
+      /* within cell range so no contribution to min_dist */
+      if (x <= centerc2) {
+	tdist = (x - maxc2) * C2_SCALE;
+	max_dist += tdist*tdist;
+      } else {
+	tdist = (x - minc2) * C2_SCALE;
+	max_dist += tdist*tdist;
+      }
+    }
+
+    mindist[i] = min_dist;	/* save away the results */
+    if (max_dist < minmaxdist)
+      minmaxdist = max_dist;
+  }
+
+  /* Now we know that no cell in the update box is more than minmaxdist
+   * away from some colormap entry.  Therefore, only colors that are
+   * within minmaxdist of some part of the box need be considered.
+   */
+  ncolors = 0;
+  for (i = 0; i < numcolors; i++) {
+    if (mindist[i] <= minmaxdist)
+      colorlist[ncolors++] = (JSAMPLE) i;
+  }
+  return ncolors;
+}
+
+
+LOCAL(void)
+find_best_colors (j_decompress_ptr cinfo, int minc0, int minc1, int minc2,
+		  int numcolors, JSAMPLE colorlist[], JSAMPLE bestcolor[])
+/* Find the closest colormap entry for each cell in the update box,
+ * given the list of candidate colors prepared by find_nearby_colors.
+ * Return the indexes of the closest entries in the bestcolor[] array.
+ * This routine uses Thomas' incremental distance calculation method to
+ * find the distance from a colormap entry to successive cells in the box.
+ */
+{
+  int ic0, ic1, ic2;
+  int i, icolor;
+  register INT32 * bptr;	/* pointer into bestdist[] array */
+  JSAMPLE * cptr;		/* pointer into bestcolor[] array */
+  INT32 dist0, dist1;		/* initial distance values */
+  register INT32 dist2;		/* current distance in inner loop */
+  INT32 xx0, xx1;		/* distance increments */
+  register INT32 xx2;
+  INT32 inc0, inc1, inc2;	/* initial values for increments */
+  /* This array holds the distance to the nearest-so-far color for each cell */
+  INT32 bestdist[BOX_C0_ELEMS * BOX_C1_ELEMS * BOX_C2_ELEMS];
+
+  /* Initialize best-distance for each cell of the update box */
+  bptr = bestdist;
+  for (i = BOX_C0_ELEMS*BOX_C1_ELEMS*BOX_C2_ELEMS-1; i >= 0; i--)
+    *bptr++ = 0x7FFFFFFFL;
+  
+  /* For each color selected by find_nearby_colors,
+   * compute its distance to the center of each cell in the box.
+   * If that's less than best-so-far, update best distance and color number.
+   */
+  
+  /* Nominal steps between cell centers ("x" in Thomas article) */
+#define STEP_C0  ((1 << C0_SHIFT) * C0_SCALE)
+#define STEP_C1  ((1 << C1_SHIFT) * C1_SCALE)
+#define STEP_C2  ((1 << C2_SHIFT) * C2_SCALE)
+  
+  for (i = 0; i < numcolors; i++) {
+    icolor = GETJSAMPLE(colorlist[i]);
+    /* Compute (square of) distance from minc0/c1/c2 to this color */
+    inc0 = (minc0 - GETJSAMPLE(cinfo->colormap[0][icolor])) * C0_SCALE;
+    dist0 = inc0*inc0;
+    inc1 = (minc1 - GETJSAMPLE(cinfo->colormap[1][icolor])) * C1_SCALE;
+    dist0 += inc1*inc1;
+    inc2 = (minc2 - GETJSAMPLE(cinfo->colormap[2][icolor])) * C2_SCALE;
+    dist0 += inc2*inc2;
+    /* Form the initial difference increments */
+    inc0 = inc0 * (2 * STEP_C0) + STEP_C0 * STEP_C0;
+    inc1 = inc1 * (2 * STEP_C1) + STEP_C1 * STEP_C1;
+    inc2 = inc2 * (2 * STEP_C2) + STEP_C2 * STEP_C2;
+    /* Now loop over all cells in box, updating distance per Thomas method */
+    bptr = bestdist;
+    cptr = bestcolor;
+    xx0 = inc0;
+    for (ic0 = BOX_C0_ELEMS-1; ic0 >= 0; ic0--) {
+      dist1 = dist0;
+      xx1 = inc1;
+      for (ic1 = BOX_C1_ELEMS-1; ic1 >= 0; ic1--) {
+	dist2 = dist1;
+	xx2 = inc2;
+	for (ic2 = BOX_C2_ELEMS-1; ic2 >= 0; ic2--) {
+	  if (dist2 < *bptr) {
+	    *bptr = dist2;
+	    *cptr = (JSAMPLE) icolor;
+	  }
+	  dist2 += xx2;
+	  xx2 += 2 * STEP_C2 * STEP_C2;
+	  bptr++;
+	  cptr++;
+	}
+	dist1 += xx1;
+	xx1 += 2 * STEP_C1 * STEP_C1;
+      }
+      dist0 += xx0;
+      xx0 += 2 * STEP_C0 * STEP_C0;
+    }
+  }
+}
+
+
+LOCAL(void)
+fill_inverse_cmap (j_decompress_ptr cinfo, int c0, int c1, int c2)
+/* Fill the inverse-colormap entries in the update box that contains */
+/* histogram cell c0/c1/c2.  (Only that one cell MUST be filled, but */
+/* we can fill as many others as we wish.) */
+{
+  my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
+  hist3d histogram = cquantize->histogram;
+  int minc0, minc1, minc2;	/* lower left corner of update box */
+  int ic0, ic1, ic2;
+  register JSAMPLE * cptr;	/* pointer into bestcolor[] array */
+  register histptr cachep;	/* pointer into main cache array */
+  /* This array lists the candidate colormap indexes. */
+  JSAMPLE colorlist[MAXNUMCOLORS];
+  int numcolors;		/* number of candidate colors */
+  /* This array holds the actually closest colormap index for each cell. */
+  JSAMPLE bestcolor[BOX_C0_ELEMS * BOX_C1_ELEMS * BOX_C2_ELEMS];
+
+  /* Convert cell coordinates to update box ID */
+  c0 >>= BOX_C0_LOG;
+  c1 >>= BOX_C1_LOG;
+  c2 >>= BOX_C2_LOG;
+
+  /* Compute true coordinates of update box's origin corner.
+   * Actually we compute the coordinates of the center of the corner
+   * histogram cell, which are the lower bounds of the volume we care about.
+   */
+  minc0 = (c0 << BOX_C0_SHIFT) + ((1 << C0_SHIFT) >> 1);
+  minc1 = (c1 << BOX_C1_SHIFT) + ((1 << C1_SHIFT) >> 1);
+  minc2 = (c2 << BOX_C2_SHIFT) + ((1 << C2_SHIFT) >> 1);
+  
+  /* Determine which colormap entries are close enough to be candidates
+   * for the nearest entry to some cell in the update box.
+   */
+  numcolors = find_nearby_colors(cinfo, minc0, minc1, minc2, colorlist);
+
+  /* Determine the actually nearest colors. */
+  find_best_colors(cinfo, minc0, minc1, minc2, numcolors, colorlist,
+		   bestcolor);
+
+  /* Save the best color numbers (plus 1) in the main cache array */
+  c0 <<= BOX_C0_LOG;		/* convert ID back to base cell indexes */
+  c1 <<= BOX_C1_LOG;
+  c2 <<= BOX_C2_LOG;
+  cptr = bestcolor;
+  for (ic0 = 0; ic0 < BOX_C0_ELEMS; ic0++) {
+    for (ic1 = 0; ic1 < BOX_C1_ELEMS; ic1++) {
+      cachep = & histogram[c0+ic0][c1+ic1][c2];
+      for (ic2 = 0; ic2 < BOX_C2_ELEMS; ic2++) {
+	*cachep++ = (histcell) (GETJSAMPLE(*cptr++) + 1);
+      }
+    }
+  }
+}
+
+
+/*
+ * Map some rows of pixels to the output colormapped representation.
+ */
+
+METHODDEF(void)
+pass2_no_dither (j_decompress_ptr cinfo,
+		 JSAMPARRAY input_buf, JSAMPARRAY output_buf, int num_rows)
+/* This version performs no dithering */
+{
+  my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
+  hist3d histogram = cquantize->histogram;
+  register JSAMPROW inptr, outptr;
+  register histptr cachep;
+  register int c0, c1, c2;
+  int row;
+  JDIMENSION col;
+  JDIMENSION width = cinfo->output_width;
+
+  for (row = 0; row < num_rows; row++) {
+    inptr = input_buf[row];
+    outptr = output_buf[row];
+    for (col = width; col > 0; col--) {
+      /* get pixel value and index into the cache */
+      c0 = GETJSAMPLE(*inptr++) >> C0_SHIFT;
+      c1 = GETJSAMPLE(*inptr++) >> C1_SHIFT;
+      c2 = GETJSAMPLE(*inptr++) >> C2_SHIFT;
+      cachep = & histogram[c0][c1][c2];
+      /* If we have not seen this color before, find nearest colormap entry */
+      /* and update the cache */
+      if (*cachep == 0)
+	fill_inverse_cmap(cinfo, c0,c1,c2);
+      /* Now emit the colormap index for this cell */
+      *outptr++ = (JSAMPLE) (*cachep - 1);
+    }
+  }
+}
+
+
+METHODDEF(void)
+pass2_fs_dither (j_decompress_ptr cinfo,
+		 JSAMPARRAY input_buf, JSAMPARRAY output_buf, int num_rows)
+/* This version performs Floyd-Steinberg dithering */
+{
+  my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
+  hist3d histogram = cquantize->histogram;
+  register LOCFSERROR cur0, cur1, cur2;	/* current error or pixel value */
+  LOCFSERROR belowerr0, belowerr1, belowerr2; /* error for pixel below cur */
+  LOCFSERROR bpreverr0, bpreverr1, bpreverr2; /* error for below/prev col */
+  register FSERRPTR errorptr;	/* => fserrors[] at column before current */
+  JSAMPROW inptr;		/* => current input pixel */
+  JSAMPROW outptr;		/* => current output pixel */
+  histptr cachep;
+  int dir;			/* +1 or -1 depending on direction */
+  int dir3;			/* 3*dir, for advancing inptr & errorptr */
+  int row;
+  JDIMENSION col;
+  JDIMENSION width = cinfo->output_width;
+  JSAMPLE *range_limit = cinfo->sample_range_limit;
+  int *error_limit = cquantize->error_limiter;
+  JSAMPROW colormap0 = cinfo->colormap[0];
+  JSAMPROW colormap1 = cinfo->colormap[1];
+  JSAMPROW colormap2 = cinfo->colormap[2];
+  SHIFT_TEMPS
+
+  for (row = 0; row < num_rows; row++) {
+    inptr = input_buf[row];
+    outptr = output_buf[row];
+    if (cquantize->on_odd_row) {
+      /* work right to left in this row */
+      inptr += (width-1) * 3;	/* so point to rightmost pixel */
+      outptr += width-1;
+      dir = -1;
+      dir3 = -3;
+      errorptr = cquantize->fserrors + (width+1)*3; /* => entry after last column */
+      cquantize->on_odd_row = FALSE; /* flip for next time */
+    } else {
+      /* work left to right in this row */
+      dir = 1;
+      dir3 = 3;
+      errorptr = cquantize->fserrors; /* => entry before first real column */
+      cquantize->on_odd_row = TRUE; /* flip for next time */
+    }
+    /* Preset error values: no error propagated to first pixel from left */
+    cur0 = cur1 = cur2 = 0;
+    /* and no error propagated to row below yet */
+    belowerr0 = belowerr1 = belowerr2 = 0;
+    bpreverr0 = bpreverr1 = bpreverr2 = 0;
+
+    for (col = width; col > 0; col--) {
+      /* curN holds the error propagated from the previous pixel on the
+       * current line.  Add the error propagated from the previous line
+       * to form the complete error correction term for this pixel, and
+       * round the error term (which is expressed * 16) to an integer.
+       * RIGHT_SHIFT rounds towards minus infinity, so adding 8 is correct
+       * for either sign of the error value.
+       * Note: errorptr points to *previous* column's array entry.
+       */
+      cur0 = RIGHT_SHIFT(cur0 + errorptr[dir3+0] + 8, 4);
+      cur1 = RIGHT_SHIFT(cur1 + errorptr[dir3+1] + 8, 4);
+      cur2 = RIGHT_SHIFT(cur2 + errorptr[dir3+2] + 8, 4);
+      /* Limit the error using transfer function set by init_error_limit.
+       * See comments with init_error_limit for rationale.
+       */
+      cur0 = error_limit[cur0];
+      cur1 = error_limit[cur1];
+      cur2 = error_limit[cur2];
+      /* Form pixel value + error, and range-limit to 0..MAXJSAMPLE.
+       * The maximum error is +- MAXJSAMPLE (or less with error limiting);
+       * this sets the required size of the range_limit array.
+       */
+      cur0 += GETJSAMPLE(inptr[0]);
+      cur1 += GETJSAMPLE(inptr[1]);
+      cur2 += GETJSAMPLE(inptr[2]);
+      cur0 = GETJSAMPLE(range_limit[cur0]);
+      cur1 = GETJSAMPLE(range_limit[cur1]);
+      cur2 = GETJSAMPLE(range_limit[cur2]);
+      /* Index into the cache with adjusted pixel value */
+      cachep = & histogram[cur0>>C0_SHIFT][cur1>>C1_SHIFT][cur2>>C2_SHIFT];
+      /* If we have not seen this color before, find nearest colormap */
+      /* entry and update the cache */
+      if (*cachep == 0)
+	fill_inverse_cmap(cinfo, cur0>>C0_SHIFT,cur1>>C1_SHIFT,cur2>>C2_SHIFT);
+      /* Now emit the colormap index for this cell */
+      { register int pixcode = *cachep - 1;
+	*outptr = (JSAMPLE) pixcode;
+	/* Compute representation error for this pixel */
+	cur0 -= GETJSAMPLE(colormap0[pixcode]);
+	cur1 -= GETJSAMPLE(colormap1[pixcode]);
+	cur2 -= GETJSAMPLE(colormap2[pixcode]);
+      }
+      /* Compute error fractions to be propagated to adjacent pixels.
+       * Add these into the running sums, and simultaneously shift the
+       * next-line error sums left by 1 column.
+       */
+      { register LOCFSERROR bnexterr, delta;
+
+	bnexterr = cur0;	/* Process component 0 */
+	delta = cur0 * 2;
+	cur0 += delta;		/* form error * 3 */
+	errorptr[0] = (FSERROR) (bpreverr0 + cur0);
+	cur0 += delta;		/* form error * 5 */
+	bpreverr0 = belowerr0 + cur0;
+	belowerr0 = bnexterr;
+	cur0 += delta;		/* form error * 7 */
+	bnexterr = cur1;	/* Process component 1 */
+	delta = cur1 * 2;
+	cur1 += delta;		/* form error * 3 */
+	errorptr[1] = (FSERROR) (bpreverr1 + cur1);
+	cur1 += delta;		/* form error * 5 */
+	bpreverr1 = belowerr1 + cur1;
+	belowerr1 = bnexterr;
+	cur1 += delta;		/* form error * 7 */
+	bnexterr = cur2;	/* Process component 2 */
+	delta = cur2 * 2;
+	cur2 += delta;		/* form error * 3 */
+	errorptr[2] = (FSERROR) (bpreverr2 + cur2);
+	cur2 += delta;		/* form error * 5 */
+	bpreverr2 = belowerr2 + cur2;
+	belowerr2 = bnexterr;
+	cur2 += delta;		/* form error * 7 */
+      }
+      /* At this point curN contains the 7/16 error value to be propagated
+       * to the next pixel on the current line, and all the errors for the
+       * next line have been shifted over.  We are therefore ready to move on.
+       */
+      inptr += dir3;		/* Advance pixel pointers to next column */
+      outptr += dir;
+      errorptr += dir3;		/* advance errorptr to current column */
+    }
+    /* Post-loop cleanup: we must unload the final error values into the
+     * final fserrors[] entry.  Note we need not unload belowerrN because
+     * it is for the dummy column before or after the actual array.
+     */
+    errorptr[0] = (FSERROR) bpreverr0; /* unload prev errs into array */
+    errorptr[1] = (FSERROR) bpreverr1;
+    errorptr[2] = (FSERROR) bpreverr2;
+  }
+}
+
+
+/*
+ * Initialize the error-limiting transfer function (lookup table).
+ * The raw F-S error computation can potentially compute error values of up to
+ * +- MAXJSAMPLE.  But we want the maximum correction applied to a pixel to be
+ * much less, otherwise obviously wrong pixels will be created.  (Typical
+ * effects include weird fringes at color-area boundaries, isolated bright
+ * pixels in a dark area, etc.)  The standard advice for avoiding this problem
+ * is to ensure that the "corners" of the color cube are allocated as output
+ * colors; then repeated errors in the same direction cannot cause cascading
+ * error buildup.  However, that only prevents the error from getting
+ * completely out of hand; Aaron Giles reports that error limiting improves
+ * the results even with corner colors allocated.
+ * A simple clamping of the error values to about +- MAXJSAMPLE/8 works pretty
+ * well, but the smoother transfer function used below is even better.  Thanks
+ * to Aaron Giles for this idea.
+ */
+
+LOCAL(void)
+init_error_limit (j_decompress_ptr cinfo)
+/* Allocate and fill in the error_limiter table */
+{
+  my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
+  int * table;
+  int in, out;
+
+  table = (int *) (*cinfo->mem->alloc_small)
+    ((j_common_ptr) cinfo, JPOOL_IMAGE, (MAXJSAMPLE*2+1) * SIZEOF(int));
+  table += MAXJSAMPLE;		/* so can index -MAXJSAMPLE .. +MAXJSAMPLE */
+  cquantize->error_limiter = table;
+
+#define STEPSIZE ((MAXJSAMPLE+1)/16)
+  /* Map errors 1:1 up to +- MAXJSAMPLE/16 */
+  out = 0;
+  for (in = 0; in < STEPSIZE; in++, out++) {
+    table[in] = out; table[-in] = -out;
+  }
+  /* Map errors 1:2 up to +- 3*MAXJSAMPLE/16 */
+  for (; in < STEPSIZE*3; in++, out += (in&1) ? 0 : 1) {
+    table[in] = out; table[-in] = -out;
+  }
+  /* Clamp the rest to final out value (which is (MAXJSAMPLE+1)/8) */
+  for (; in <= MAXJSAMPLE; in++) {
+    table[in] = out; table[-in] = -out;
+  }
+#undef STEPSIZE
+}
+
+
+/*
+ * Finish up at the end of each pass.
+ */
+
+METHODDEF(void)
+finish_pass1 (j_decompress_ptr cinfo)
+{
+  my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
+
+  /* Select the representative colors and fill in cinfo->colormap */
+  cinfo->colormap = cquantize->sv_colormap;
+  select_colors(cinfo, cquantize->desired);
+  /* Force next pass to zero the color index table */
+  cquantize->needs_zeroed = TRUE;
+}
+
+
+METHODDEF(void)
+finish_pass2 (j_decompress_ptr cinfo)
+{
+  /* no work */
+}
+
+
+/*
+ * Initialize for each processing pass.
+ */
+
+METHODDEF(void)
+start_pass_2_quant (j_decompress_ptr cinfo, boolean is_pre_scan)
+{
+  my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
+  hist3d histogram = cquantize->histogram;
+  int i;
+
+  /* Only F-S dithering or no dithering is supported. */
+  /* If user asks for ordered dither, give him F-S. */
+  if (cinfo->dither_mode != JDITHER_NONE)
+    cinfo->dither_mode = JDITHER_FS;
+
+  if (is_pre_scan) {
+    /* Set up method pointers */
+    cquantize->pub.color_quantize = prescan_quantize;
+    cquantize->pub.finish_pass = finish_pass1;
+    cquantize->needs_zeroed = TRUE; /* Always zero histogram */
+  } else {
+    /* Set up method pointers */
+    if (cinfo->dither_mode == JDITHER_FS)
+      cquantize->pub.color_quantize = pass2_fs_dither;
+    else
+      cquantize->pub.color_quantize = pass2_no_dither;
+    cquantize->pub.finish_pass = finish_pass2;
+
+    /* Make sure color count is acceptable */
+    i = cinfo->actual_number_of_colors;
+    if (i < 1)
+      ERREXIT1(cinfo, JERR_QUANT_FEW_COLORS, 1);
+    if (i > MAXNUMCOLORS)
+      ERREXIT1(cinfo, JERR_QUANT_MANY_COLORS, MAXNUMCOLORS);
+
+    if (cinfo->dither_mode == JDITHER_FS) {
+      size_t arraysize = (size_t) ((cinfo->output_width + 2) *
+				   (3 * SIZEOF(FSERROR)));
+      /* Allocate Floyd-Steinberg workspace if we didn't already. */
+      if (cquantize->fserrors == NULL)
+	cquantize->fserrors = (FSERRPTR) (*cinfo->mem->alloc_large)
+	  ((j_common_ptr) cinfo, JPOOL_IMAGE, arraysize);
+      /* Initialize the propagated errors to zero. */
+      jzero_far((void FAR *) cquantize->fserrors, arraysize);
+      /* Make the error-limit table if we didn't already. */
+      if (cquantize->error_limiter == NULL)
+	init_error_limit(cinfo);
+      cquantize->on_odd_row = FALSE;
+    }
+
+  }
+  /* Zero the histogram or inverse color map, if necessary */
+  if (cquantize->needs_zeroed) {
+    for (i = 0; i < HIST_C0_ELEMS; i++) {
+      jzero_far((void FAR *) histogram[i],
+		HIST_C1_ELEMS*HIST_C2_ELEMS * SIZEOF(histcell));
+    }
+    cquantize->needs_zeroed = FALSE;
+  }
+}
+
+
+/*
+ * Switch to a new external colormap between output passes.
+ */
+
+METHODDEF(void)
+new_color_map_2_quant (j_decompress_ptr cinfo)
+{
+  my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize;
+
+  /* Reset the inverse color map */
+  cquantize->needs_zeroed = TRUE;
+}
+
+
+/*
+ * Module initialization routine for 2-pass color quantization.
+ */
+
+GLOBAL(void)
+jinit_2pass_quantizer (j_decompress_ptr cinfo)
+{
+  my_cquantize_ptr cquantize;
+  int i;
+
+  cquantize = (my_cquantize_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				SIZEOF(my_cquantizer));
+  cinfo->cquantize = (struct jpeg_color_quantizer *) cquantize;
+  cquantize->pub.start_pass = start_pass_2_quant;
+  cquantize->pub.new_color_map = new_color_map_2_quant;
+  cquantize->fserrors = NULL;	/* flag optional arrays not allocated */
+  cquantize->error_limiter = NULL;
+
+  /* Make sure jdmaster didn't give me a case I can't handle */
+  if (cinfo->out_color_components != 3)
+    ERREXIT(cinfo, JERR_NOTIMPL);
+
+  /* Allocate the histogram/inverse colormap storage */
+  cquantize->histogram = (hist3d) (*cinfo->mem->alloc_small)
+    ((j_common_ptr) cinfo, JPOOL_IMAGE, HIST_C0_ELEMS * SIZEOF(hist2d));
+  for (i = 0; i < HIST_C0_ELEMS; i++) {
+    cquantize->histogram[i] = (hist2d) (*cinfo->mem->alloc_large)
+      ((j_common_ptr) cinfo, JPOOL_IMAGE,
+       HIST_C1_ELEMS*HIST_C2_ELEMS * SIZEOF(histcell));
+  }
+  cquantize->needs_zeroed = TRUE; /* histogram is garbage now */
+
+  /* Allocate storage for the completed colormap, if required.
+   * We do this now since it is FAR storage and may affect
+   * the memory manager's space calculations.
+   */
+  if (cinfo->enable_2pass_quant) {
+    /* Make sure color count is acceptable */
+    int desired = cinfo->desired_number_of_colors;
+    /* Lower bound on # of colors ... somewhat arbitrary as long as > 0 */
+    if (desired < 8)
+      ERREXIT1(cinfo, JERR_QUANT_FEW_COLORS, 8);
+    /* Make sure colormap indexes can be represented by JSAMPLEs */
+    if (desired > MAXNUMCOLORS)
+      ERREXIT1(cinfo, JERR_QUANT_MANY_COLORS, MAXNUMCOLORS);
+    cquantize->sv_colormap = (*cinfo->mem->alloc_sarray)
+      ((j_common_ptr) cinfo,JPOOL_IMAGE, (JDIMENSION) desired, (JDIMENSION) 3);
+    cquantize->desired = desired;
+  } else
+    cquantize->sv_colormap = NULL;
+
+  /* Only F-S dithering or no dithering is supported. */
+  /* If user asks for ordered dither, give him F-S. */
+  if (cinfo->dither_mode != JDITHER_NONE)
+    cinfo->dither_mode = JDITHER_FS;
+
+  /* Allocate Floyd-Steinberg workspace if necessary.
+   * This isn't really needed until pass 2, but again it is FAR storage.
+   * Although we will cope with a later change in dither_mode,
+   * we do not promise to honor max_memory_to_use if dither_mode changes.
+   */
+  if (cinfo->dither_mode == JDITHER_FS) {
+    cquantize->fserrors = (FSERRPTR) (*cinfo->mem->alloc_large)
+      ((j_common_ptr) cinfo, JPOOL_IMAGE,
+       (size_t) ((cinfo->output_width + 2) * (3 * SIZEOF(FSERROR))));
+    /* Might as well create the error-limiting table too. */
+    init_error_limit(cinfo);
+  }
+}
+
+#endif /* QUANT_2PASS_SUPPORTED */
diff --git a/src/libjpeg-turbo/jsimd.h b/src/libjpeg-turbo/jsimd.h
new file mode 100644
index 0000000..3fa2c43
--- /dev/null
+++ b/src/libjpeg-turbo/jsimd.h
@@ -0,0 +1,98 @@
+/*
+ * jsimd.h
+ *
+ * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+ * Copyright 2011 D. R. Commander
+ * 
+ * Based on the x86 SIMD extension for IJG JPEG library,
+ * Copyright (C) 1999-2006, MIYASAKA Masaru.
+ * For conditions of distribution and use, see copyright notice in jsimdext.inc
+ *
+ */
+
+/* Short forms of external names for systems with brain-damaged linkers. */
+
+#ifdef NEED_SHORT_EXTERNAL_NAMES
+#define jsimd_can_rgb_ycc                 jSCanRgbYcc
+#define jsimd_can_rgb_gray                jSCanRgbGry
+#define jsimd_can_ycc_rgb                 jSCanYccRgb
+#define jsimd_rgb_ycc_convert             jSRgbYccConv
+#define jsimd_rgb_gray_convert            jSRgbGryConv
+#define jsimd_ycc_rgb_convert             jSYccRgbConv
+#define jsimd_can_h2v2_downsample         jSCanH2V2Down
+#define jsimd_can_h2v1_downsample         jSCanH2V1Down
+#define jsimd_h2v2_downsample             jSH2V2Down
+#define jsimd_h2v1_downsample             jSH2V1Down
+#define jsimd_can_h2v2_upsample           jSCanH2V2Up
+#define jsimd_can_h2v1_upsample           jSCanH2V1Up
+#define jsimd_h2v2_upsample               jSH2V2Up
+#define jsimd_h2v1_upsample               jSH2V1Up
+#define jsimd_can_h2v2_fancy_upsample     jSCanH2V2FUp
+#define jsimd_can_h2v1_fancy_upsample     jSCanH2V1FUp
+#define jsimd_h2v2_fancy_upsample         jSH2V2FUp
+#define jsimd_h2v1_fancy_upsample         jSH2V1FUp
+#define jsimd_can_h2v2_merged_upsample    jSCanH2V2MUp
+#define jsimd_can_h2v1_merged_upsample    jSCanH2V1MUp
+#define jsimd_h2v2_merged_upsample        jSH2V2MUp
+#define jsimd_h2v1_merged_upsample        jSH2V1MUp
+#endif /* NEED_SHORT_EXTERNAL_NAMES */
+
+EXTERN(int) jsimd_can_rgb_ycc JPP((void));
+EXTERN(int) jsimd_can_rgb_gray JPP((void));
+EXTERN(int) jsimd_can_ycc_rgb JPP((void));
+
+EXTERN(void) jsimd_rgb_ycc_convert
+        JPP((j_compress_ptr cinfo,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_rgb_gray_convert
+        JPP((j_compress_ptr cinfo,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_ycc_rgb_convert
+        JPP((j_decompress_ptr cinfo,
+             JSAMPIMAGE input_buf, JDIMENSION input_row,
+             JSAMPARRAY output_buf, int num_rows));
+
+EXTERN(int) jsimd_can_h2v2_downsample JPP((void));
+EXTERN(int) jsimd_can_h2v1_downsample JPP((void));
+
+EXTERN(void) jsimd_h2v2_downsample
+        JPP((j_compress_ptr cinfo, jpeg_component_info * compptr,
+             JSAMPARRAY input_data, JSAMPARRAY output_data));
+EXTERN(void) jsimd_h2v1_downsample
+        JPP((j_compress_ptr cinfo, jpeg_component_info * compptr,
+             JSAMPARRAY input_data, JSAMPARRAY output_data));
+
+EXTERN(int) jsimd_can_h2v2_upsample JPP((void));
+EXTERN(int) jsimd_can_h2v1_upsample JPP((void));
+
+EXTERN(void) jsimd_h2v2_upsample
+        JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+             JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr));
+EXTERN(void) jsimd_h2v1_upsample
+        JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+             JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr));
+
+EXTERN(int) jsimd_can_h2v2_fancy_upsample JPP((void));
+EXTERN(int) jsimd_can_h2v1_fancy_upsample JPP((void));
+
+EXTERN(void) jsimd_h2v2_fancy_upsample
+        JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+             JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr));
+EXTERN(void) jsimd_h2v1_fancy_upsample
+        JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+             JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr));
+
+EXTERN(int) jsimd_can_h2v2_merged_upsample JPP((void));
+EXTERN(int) jsimd_can_h2v1_merged_upsample JPP((void));
+
+EXTERN(void) jsimd_h2v2_merged_upsample
+        JPP((j_decompress_ptr cinfo,
+             JSAMPIMAGE input_buf, JDIMENSION in_row_group_ctr,
+             JSAMPARRAY output_buf));
+EXTERN(void) jsimd_h2v1_merged_upsample
+        JPP((j_decompress_ptr cinfo,
+             JSAMPIMAGE input_buf, JDIMENSION in_row_group_ctr,
+             JSAMPARRAY output_buf));
+
diff --git a/src/libjpeg-turbo/jsimddct.h b/src/libjpeg-turbo/jsimddct.h
new file mode 100644
index 0000000..a1c7440
--- /dev/null
+++ b/src/libjpeg-turbo/jsimddct.h
@@ -0,0 +1,102 @@
+/*
+ * jsimddct.h
+ *
+ * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+ * 
+ * Based on the x86 SIMD extension for IJG JPEG library,
+ * Copyright (C) 1999-2006, MIYASAKA Masaru.
+ * For conditions of distribution and use, see copyright notice in jsimdext.inc
+ *
+ */
+
+/* Short forms of external names for systems with brain-damaged linkers. */
+
+#ifdef NEED_SHORT_EXTERNAL_NAMES
+#define jsimd_can_convsamp                jSCanConv
+#define jsimd_can_convsamp_float          jSCanConvF
+#define jsimd_convsamp                    jSConv
+#define jsimd_convsamp_float              jSConvF
+#define jsimd_can_fdct_islow              jSCanFDCTIS
+#define jsimd_can_fdct_ifast              jSCanFDCTIF
+#define jsimd_can_fdct_float              jSCanFDCTFl
+#define jsimd_fdct_islow                  jSFDCTIS
+#define jsimd_fdct_ifast                  jSFDCTIF
+#define jsimd_fdct_float                  jSFDCTFl
+#define jsimd_can_quantize                jSCanQuant
+#define jsimd_can_quantize_float          jSCanQuantF
+#define jsimd_quantize                    jSQuant
+#define jsimd_quantize_float              jSQuantF
+#define jsimd_can_idct_2x2                jSCanIDCT22
+#define jsimd_can_idct_4x4                jSCanIDCT44
+#define jsimd_idct_2x2                    jSIDCT22
+#define jsimd_idct_4x4                    jSIDCT44
+#define jsimd_can_idct_islow              jSCanIDCTIS
+#define jsimd_can_idct_ifast              jSCanIDCTIF
+#define jsimd_can_idct_float              jSCanIDCTFl
+#define jsimd_idct_islow                  jSIDCTIS
+#define jsimd_idct_ifast                  jSIDCTIF
+#define jsimd_idct_float                  jSIDCTFl
+#endif /* NEED_SHORT_EXTERNAL_NAMES */
+
+EXTERN(int) jsimd_can_convsamp JPP((void));
+EXTERN(int) jsimd_can_convsamp_float JPP((void));
+
+EXTERN(void) jsimd_convsamp JPP((JSAMPARRAY sample_data,
+                                 JDIMENSION start_col,
+                                 DCTELEM * workspace));
+EXTERN(void) jsimd_convsamp_float JPP((JSAMPARRAY sample_data,
+                                       JDIMENSION start_col,
+                                       FAST_FLOAT * workspace));
+
+EXTERN(int) jsimd_can_fdct_islow JPP((void));
+EXTERN(int) jsimd_can_fdct_ifast JPP((void));
+EXTERN(int) jsimd_can_fdct_float JPP((void));
+
+EXTERN(void) jsimd_fdct_islow JPP((DCTELEM * data));
+EXTERN(void) jsimd_fdct_ifast JPP((DCTELEM * data));
+EXTERN(void) jsimd_fdct_float JPP((FAST_FLOAT * data));
+
+EXTERN(int) jsimd_can_quantize JPP((void));
+EXTERN(int) jsimd_can_quantize_float JPP((void));
+
+EXTERN(void) jsimd_quantize JPP((JCOEFPTR coef_block,
+                                 DCTELEM * divisors,
+                                 DCTELEM * workspace));
+EXTERN(void) jsimd_quantize_float JPP((JCOEFPTR coef_block,
+                                       FAST_FLOAT * divisors,
+                                       FAST_FLOAT * workspace));
+
+EXTERN(int) jsimd_can_idct_2x2 JPP((void));
+EXTERN(int) jsimd_can_idct_4x4 JPP((void));
+
+EXTERN(void) jsimd_idct_2x2 JPP((j_decompress_ptr cinfo,
+                                 jpeg_component_info * compptr,
+                                 JCOEFPTR coef_block,
+                                 JSAMPARRAY output_buf,
+                                 JDIMENSION output_col));
+EXTERN(void) jsimd_idct_4x4 JPP((j_decompress_ptr cinfo,
+                                 jpeg_component_info * compptr,
+                                 JCOEFPTR coef_block,
+                                 JSAMPARRAY output_buf,
+                                 JDIMENSION output_col));
+
+EXTERN(int) jsimd_can_idct_islow JPP((void));
+EXTERN(int) jsimd_can_idct_ifast JPP((void));
+EXTERN(int) jsimd_can_idct_float JPP((void));
+
+EXTERN(void) jsimd_idct_islow JPP((j_decompress_ptr cinfo,
+                                   jpeg_component_info * compptr,
+                                   JCOEFPTR coef_block,
+                                   JSAMPARRAY output_buf,
+                                   JDIMENSION output_col));
+EXTERN(void) jsimd_idct_ifast JPP((j_decompress_ptr cinfo,
+                                   jpeg_component_info * compptr,
+                                   JCOEFPTR coef_block,
+                                   JSAMPARRAY output_buf,
+                                   JDIMENSION output_col));
+EXTERN(void) jsimd_idct_float JPP((j_decompress_ptr cinfo,
+                                   jpeg_component_info * compptr,
+                                   JCOEFPTR coef_block,
+                                   JSAMPARRAY output_buf,
+                                   JDIMENSION output_col));
+
diff --git a/src/libjpeg-turbo/jutils.c b/src/libjpeg-turbo/jutils.c
new file mode 100644
index 0000000..d18a955
--- /dev/null
+++ b/src/libjpeg-turbo/jutils.c
@@ -0,0 +1,179 @@
+/*
+ * jutils.c
+ *
+ * Copyright (C) 1991-1996, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains tables and miscellaneous utility routines needed
+ * for both compression and decompression.
+ * Note we prefix all global names with "j" to minimize conflicts with
+ * a surrounding application.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+
+
+/*
+ * jpeg_zigzag_order[i] is the zigzag-order position of the i'th element
+ * of a DCT block read in natural order (left to right, top to bottom).
+ */
+
+#if 0				/* This table is not actually needed in v6a */
+
+const int jpeg_zigzag_order[DCTSIZE2] = {
+   0,  1,  5,  6, 14, 15, 27, 28,
+   2,  4,  7, 13, 16, 26, 29, 42,
+   3,  8, 12, 17, 25, 30, 41, 43,
+   9, 11, 18, 24, 31, 40, 44, 53,
+  10, 19, 23, 32, 39, 45, 52, 54,
+  20, 22, 33, 38, 46, 51, 55, 60,
+  21, 34, 37, 47, 50, 56, 59, 61,
+  35, 36, 48, 49, 57, 58, 62, 63
+};
+
+#endif
+
+/*
+ * jpeg_natural_order[i] is the natural-order position of the i'th element
+ * of zigzag order.
+ *
+ * When reading corrupted data, the Huffman decoders could attempt
+ * to reference an entry beyond the end of this array (if the decoded
+ * zero run length reaches past the end of the block).  To prevent
+ * wild stores without adding an inner-loop test, we put some extra
+ * "63"s after the real entries.  This will cause the extra coefficient
+ * to be stored in location 63 of the block, not somewhere random.
+ * The worst case would be a run-length of 15, which means we need 16
+ * fake entries.
+ */
+
+const int jpeg_natural_order[DCTSIZE2+16] = {
+  0,  1,  8, 16,  9,  2,  3, 10,
+ 17, 24, 32, 25, 18, 11,  4,  5,
+ 12, 19, 26, 33, 40, 48, 41, 34,
+ 27, 20, 13,  6,  7, 14, 21, 28,
+ 35, 42, 49, 56, 57, 50, 43, 36,
+ 29, 22, 15, 23, 30, 37, 44, 51,
+ 58, 59, 52, 45, 38, 31, 39, 46,
+ 53, 60, 61, 54, 47, 55, 62, 63,
+ 63, 63, 63, 63, 63, 63, 63, 63, /* extra entries for safety in decoder */
+ 63, 63, 63, 63, 63, 63, 63, 63
+};
+
+
+/*
+ * Arithmetic utilities
+ */
+
+GLOBAL(long)
+jdiv_round_up (long a, long b)
+/* Compute a/b rounded up to next integer, ie, ceil(a/b) */
+/* Assumes a >= 0, b > 0 */
+{
+  return (a + b - 1L) / b;
+}
+
+
+GLOBAL(long)
+jround_up (long a, long b)
+/* Compute a rounded up to next multiple of b, ie, ceil(a/b)*b */
+/* Assumes a >= 0, b > 0 */
+{
+  a += b - 1L;
+  return a - (a % b);
+}
+
+
+/* On normal machines we can apply MEMCOPY() and MEMZERO() to sample arrays
+ * and coefficient-block arrays.  This won't work on 80x86 because the arrays
+ * are FAR and we're assuming a small-pointer memory model.  However, some
+ * DOS compilers provide far-pointer versions of memcpy() and memset() even
+ * in the small-model libraries.  These will be used if USE_FMEM is defined.
+ * Otherwise, the routines below do it the hard way.  (The performance cost
+ * is not all that great, because these routines aren't very heavily used.)
+ */
+
+#ifndef NEED_FAR_POINTERS	/* normal case, same as regular macros */
+#define FMEMCOPY(dest,src,size)	MEMCOPY(dest,src,size)
+#define FMEMZERO(target,size)	MEMZERO(target,size)
+#else				/* 80x86 case, define if we can */
+#ifdef USE_FMEM
+#define FMEMCOPY(dest,src,size)	_fmemcpy((void FAR *)(dest), (const void FAR *)(src), (size_t)(size))
+#define FMEMZERO(target,size)	_fmemset((void FAR *)(target), 0, (size_t)(size))
+#endif
+#endif
+
+
+GLOBAL(void)
+jcopy_sample_rows (JSAMPARRAY input_array, int source_row,
+		   JSAMPARRAY output_array, int dest_row,
+		   int num_rows, JDIMENSION num_cols)
+/* Copy some rows of samples from one place to another.
+ * num_rows rows are copied from input_array[source_row++]
+ * to output_array[dest_row++]; these areas may overlap for duplication.
+ * The source and destination arrays must be at least as wide as num_cols.
+ */
+{
+  register JSAMPROW inptr, outptr;
+#ifdef FMEMCOPY
+  register size_t count = (size_t) (num_cols * SIZEOF(JSAMPLE));
+#else
+  register JDIMENSION count;
+#endif
+  register int row;
+
+  input_array += source_row;
+  output_array += dest_row;
+
+  for (row = num_rows; row > 0; row--) {
+    inptr = *input_array++;
+    outptr = *output_array++;
+#ifdef FMEMCOPY
+    FMEMCOPY(outptr, inptr, count);
+#else
+    for (count = num_cols; count > 0; count--)
+      *outptr++ = *inptr++;	/* needn't bother with GETJSAMPLE() here */
+#endif
+  }
+}
+
+
+GLOBAL(void)
+jcopy_block_row (JBLOCKROW input_row, JBLOCKROW output_row,
+		 JDIMENSION num_blocks)
+/* Copy a row of coefficient blocks from one place to another. */
+{
+#ifdef FMEMCOPY
+  FMEMCOPY(output_row, input_row, num_blocks * (DCTSIZE2 * SIZEOF(JCOEF)));
+#else
+  register JCOEFPTR inptr, outptr;
+  register long count;
+
+  inptr = (JCOEFPTR) input_row;
+  outptr = (JCOEFPTR) output_row;
+  for (count = (long) num_blocks * DCTSIZE2; count > 0; count--) {
+    *outptr++ = *inptr++;
+  }
+#endif
+}
+
+
+GLOBAL(void)
+jzero_far (void FAR * target, size_t bytestozero)
+/* Zero out a chunk of FAR memory. */
+/* This might be sample-array data, block-array data, or alloc_large data. */
+{
+#ifdef FMEMZERO
+  FMEMZERO(target, bytestozero);
+#else
+  register char FAR * ptr = (char FAR *) target;
+  register size_t count;
+
+  for (count = bytestozero; count > 0; count--) {
+    *ptr++ = 0;
+  }
+#endif
+}
diff --git a/src/libjpeg-turbo/jversion.h b/src/libjpeg-turbo/jversion.h
new file mode 100644
index 0000000..71d7b91
--- /dev/null
+++ b/src/libjpeg-turbo/jversion.h
@@ -0,0 +1,31 @@
+/*
+ * jversion.h
+ *
+ * Copyright (C) 1991-2010, Thomas G. Lane, Guido Vollbeding.
+ * Copyright (C) 2010, 2012, D. R. Commander.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains software version identification.
+ */
+
+
+#if JPEG_LIB_VERSION >= 80
+
+#define JVERSION	"8b  16-May-2010"
+
+#elif JPEG_LIB_VERSION >= 70
+
+#define JVERSION        "7  27-Jun-2009"
+
+#else
+
+#define JVERSION	"6b  27-Mar-1998"
+
+#endif
+
+#define JCOPYRIGHT	"Copyright (C) 1991-2010 Thomas G. Lane, Guido Vollbeding\n" \
+			"Copyright (C) 1999-2006 MIYASAKA Masaru\n" \
+			"Copyright (C) 2009 Pierre Ossman for Cendio AB\n" \
+			"Copyright (C) 2009-2012 D. R. Commander\n" \
+			"Copyright (C) 2009-2011 Nokia Corporation and/or its subsidiary(-ies)"
diff --git a/src/libjpeg-turbo/simd/jsimd.h b/src/libjpeg-turbo/simd/jsimd.h
new file mode 100644
index 0000000..6ee99cc
--- /dev/null
+++ b/src/libjpeg-turbo/simd/jsimd.h
@@ -0,0 +1,666 @@
+/*
+ * simd/jsimd.h
+ *
+ * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+ * Copyright 2011 D. R. Commander
+ * 
+ * Based on the x86 SIMD extension for IJG JPEG library,
+ * Copyright (C) 1999-2006, MIYASAKA Masaru.
+ * For conditions of distribution and use, see copyright notice in jsimdext.inc
+ *
+ */
+
+/* Bitmask for supported acceleration methods */
+
+#define JSIMD_NONE       0x00
+#define JSIMD_MMX        0x01
+#define JSIMD_3DNOW      0x02
+#define JSIMD_SSE        0x04
+#define JSIMD_SSE2       0x08
+#define JSIMD_ARM_NEON   0x10
+
+/* Short forms of external names for systems with brain-damaged linkers. */
+
+#ifdef NEED_SHORT_EXTERNAL_NAMES
+#define jpeg_simd_cpu_support                 jSiCpuSupport
+#define jsimd_rgb_ycc_convert_mmx             jSRGBYCCM
+#define jsimd_extrgb_ycc_convert_mmx          jSEXTRGBYCCM
+#define jsimd_extrgbx_ycc_convert_mmx         jSEXTRGBXYCCM
+#define jsimd_extbgr_ycc_convert_mmx          jSEXTBGRYCCM
+#define jsimd_extbgrx_ycc_convert_mmx         jSEXTBGRXYCCM
+#define jsimd_extxbgr_ycc_convert_mmx         jSEXTXBGRYCCM
+#define jsimd_extxrgb_ycc_convert_mmx         jSEXTXRGBYCCM
+#define jsimd_rgb_gray_convert_mmx            jSRGBGRYM
+#define jsimd_extrgb_gray_convert_mmx         jSEXTRGBGRYM
+#define jsimd_extrgbx_gray_convert_mmx        jSEXTRGBXGRYM
+#define jsimd_extbgr_gray_convert_mmx         jSEXTBGRGRYM
+#define jsimd_extbgrx_gray_convert_mmx        jSEXTBGRXGRYM
+#define jsimd_extxbgr_gray_convert_mmx        jSEXTXBGRGRYM
+#define jsimd_extxrgb_gray_convert_mmx        jSEXTXRGBGRYM
+#define jsimd_ycc_rgb_convert_mmx             jSYCCRGBM
+#define jsimd_ycc_extrgb_convert_mmx          jSYCCEXTRGBM
+#define jsimd_ycc_extrgbx_convert_mmx         jSYCCEXTRGBXM
+#define jsimd_ycc_extbgr_convert_mmx          jSYCCEXTBGRM
+#define jsimd_ycc_extbgrx_convert_mmx         jSYCCEXTBGRXM
+#define jsimd_ycc_extxbgr_convert_mmx         jSYCCEXTXBGRM
+#define jsimd_ycc_extxrgb_convert_mmx         jSYCCEXTXRGBM
+#define jconst_rgb_ycc_convert_sse2           jSCRGBYCCS2
+#define jsimd_rgb_ycc_convert_sse2            jSRGBYCCS2
+#define jsimd_extrgb_ycc_convert_sse2         jSEXTRGBYCCS2
+#define jsimd_extrgbx_ycc_convert_sse2        jSEXTRGBXYCCS2
+#define jsimd_extbgr_ycc_convert_sse2         jSEXTBGRYCCS2
+#define jsimd_extbgrx_ycc_convert_sse2        jSEXTBGRXYCCS2
+#define jsimd_extxbgr_ycc_convert_sse2        jSEXTXBGRYCCS2
+#define jsimd_extxrgb_ycc_convert_sse2        jSEXTXRGBYCCS2
+#define jconst_rgb_gray_convert_sse2          jSCRGBGRYS2
+#define jsimd_rgb_gray_convert_sse2           jSRGBGRYS2
+#define jsimd_extrgb_gray_convert_sse2        jSEXTRGBGRYS2
+#define jsimd_extrgbx_gray_convert_sse2       jSEXTRGBXGRYS2
+#define jsimd_extbgr_gray_convert_sse2        jSEXTBGRGRYS2
+#define jsimd_extbgrx_gray_convert_sse2       jSEXTBGRXGRYS2
+#define jsimd_extxbgr_gray_convert_sse2       jSEXTXBGRGRYS2
+#define jsimd_extxrgb_gray_convert_sse2       jSEXTXRGBGRYS2
+#define jconst_ycc_rgb_convert_sse2           jSCYCCRGBS2
+#define jsimd_ycc_rgb_convert_sse2            jSYCCRGBS2
+#define jsimd_ycc_extrgb_convert_sse2         jSYCCEXTRGBS2
+#define jsimd_ycc_extrgbx_convert_sse2        jSYCCEXTRGBXS2
+#define jsimd_ycc_extbgr_convert_sse2         jSYCCEXTBGRS2
+#define jsimd_ycc_extbgrx_convert_sse2        jSYCCEXTBGRXS2
+#define jsimd_ycc_extxbgr_convert_sse2        jSYCCEXTXBGRS2
+#define jsimd_ycc_extxrgb_convert_sse2        jSYCCEXTXRGBS2
+#define jsimd_h2v2_downsample_mmx             jSDnH2V2M
+#define jsimd_h2v1_downsample_mmx             jSDnH2V1M
+#define jsimd_h2v2_downsample_sse2            jSDnH2V2S2
+#define jsimd_h2v1_downsample_sse2            jSDnH2V1S2
+#define jsimd_h2v2_upsample_mmx               jSUpH2V2M
+#define jsimd_h2v1_upsample_mmx               jSUpH2V1M
+#define jsimd_h2v2_fancy_upsample_mmx         jSFUpH2V2M
+#define jsimd_h2v1_fancy_upsample_mmx         jSFUpH2V1M
+#define jsimd_h2v2_merged_upsample_mmx        jSMUpH2V2M
+#define jsimd_h2v2_extrgb_merged_upsample_mmx jSMUpH2V2EXTRGBM
+#define jsimd_h2v2_extrgbx_merged_upsample_mmx jSMUpH2V2EXTRGBXM
+#define jsimd_h2v2_extbgr_merged_upsample_mmx jSMUpH2V2EXTBGRM
+#define jsimd_h2v2_extbgrx_merged_upsample_mmx jSMUpH2V2EXTBGRXM
+#define jsimd_h2v2_extxbgr_merged_upsample_mmx jSMUpH2V2EXTXBGRM
+#define jsimd_h2v2_extxrgb_merged_upsample_mmx jSMUpH2V2EXTXRGBM
+#define jsimd_h2v1_merged_upsample_mmx        jSMUpH2V1M
+#define jsimd_h2v1_extrgb_merged_upsample_mmx jSMUpH2V1EXTRGBM
+#define jsimd_h2v1_extrgbx_merged_upsample_mmx jSMUpH2V1EXTRGBXM
+#define jsimd_h2v1_extbgr_merged_upsample_mmx jSMUpH2V1EXTBGRM
+#define jsimd_h2v1_extbgrx_merged_upsample_mmx jSMUpH2V1EXTBGRXM
+#define jsimd_h2v1_extxbgr_merged_upsample_mmx jSMUpH2V1EXTXBGRM
+#define jsimd_h2v1_extxrgb_merged_upsample_mmx jSMUpH2V1EXTXRGBM
+#define jsimd_h2v2_upsample_sse2              jSUpH2V2S2
+#define jsimd_h2v1_upsample_sse2              jSUpH2V1S2
+#define jconst_fancy_upsample_sse2            jSCFUpS2
+#define jsimd_h2v2_fancy_upsample_sse2        jSFUpH2V2S2
+#define jsimd_h2v1_fancy_upsample_sse2        jSFUpH2V1S2
+#define jconst_merged_upsample_sse2           jSCMUpS2
+#define jsimd_h2v2_merged_upsample_sse2       jSMUpH2V2S2
+#define jsimd_h2v2_extrgb_merged_upsample_sse2 jSMUpH2V2EXTRGBS2
+#define jsimd_h2v2_extrgbx_merged_upsample_sse2 jSMUpH2V2EXTRGBXS2
+#define jsimd_h2v2_extbgr_merged_upsample_sse2 jSMUpH2V2EXTBGRS2
+#define jsimd_h2v2_extbgrx_merged_upsample_sse2 jSMUpH2V2EXTBGRXS2
+#define jsimd_h2v2_extxbgr_merged_upsample_sse2 jSMUpH2V2EXTXBGRS2
+#define jsimd_h2v2_extxrgb_merged_upsample_sse2 jSMUpH2V2EXTXRGBS2
+#define jsimd_h2v1_merged_upsample_sse2       jSMUpH2V1S2
+#define jsimd_h2v1_extrgb_merged_upsample_sse2 jSMUpH2V1EXTRGBS2
+#define jsimd_h2v1_extrgbx_merged_upsample_sse2 jSMUpH2V1EXTRGBXS2
+#define jsimd_h2v1_extbgr_merged_upsample_sse2 jSMUpH2V1EXTBGRS2
+#define jsimd_h2v1_extbgrx_merged_upsample_sse2 jSMUpH2V1EXTBGRXS2
+#define jsimd_h2v1_extxbgr_merged_upsample_sse2 jSMUpH2V1EXTXBGRS2
+#define jsimd_h2v1_extxrgb_merged_upsample_sse2 jSMUpH2V1EXTXRGBS2
+#define jsimd_convsamp_mmx                    jSConvM
+#define jsimd_convsamp_sse2                   jSConvS2
+#define jsimd_convsamp_float_3dnow            jSConvF3D
+#define jsimd_convsamp_float_sse              jSConvFS
+#define jsimd_convsamp_float_sse2             jSConvFS2
+#define jsimd_fdct_islow_mmx                  jSFDMIS
+#define jsimd_fdct_ifast_mmx                  jSFDMIF
+#define jconst_fdct_islow_sse2                jSCFDS2IS
+#define jsimd_fdct_islow_sse2                 jSFDS2IS
+#define jconst_fdct_ifast_sse2                jSCFDS2IF
+#define jsimd_fdct_ifast_sse2                 jSFDS2IF
+#define jsimd_fdct_float_3dnow                jSFD3DF
+#define jconst_fdct_float_sse                 jSCFDSF
+#define jsimd_fdct_float_sse                  jSFDSF
+#define jsimd_quantize_mmx                    jSQuantM
+#define jsimd_quantize_sse2                   jSQuantS2
+#define jsimd_quantize_float_3dnow            jSQuantF3D
+#define jsimd_quantize_float_sse              jSQuantFS
+#define jsimd_quantize_float_sse2             jSQuantFS2
+#define jsimd_idct_2x2_mmx                    jSIDM22
+#define jsimd_idct_4x4_mmx                    jSIDM44
+#define jconst_idct_red_sse2                  jSCIDS2R
+#define jsimd_idct_2x2_sse2                   jSIDS222
+#define jsimd_idct_4x4_sse2                   jSIDS244
+#define jsimd_idct_islow_mmx                  jSIDMIS
+#define jsimd_idct_ifast_mmx                  jSIDMIF
+#define jconst_idct_islow_sse2                jSCIDS2IS
+#define jsimd_idct_islow_sse2                 jSIDS2IS
+#define jconst_idct_ifast_sse2                jSCIDS2IF
+#define jsimd_idct_ifast_sse2                 jSIDS2IF
+#define jsimd_idct_float_3dnow                jSID3DF
+#define jconst_fdct_float_sse                 jSCIDSF
+#define jsimd_idct_float_sse                  jSIDSF
+#define jconst_fdct_float_sse2                jSCIDS2F
+#define jsimd_idct_float_sse2                 jSIDS2F
+#endif /* NEED_SHORT_EXTERNAL_NAMES */
+
+/* SIMD Ext: retrieve SIMD/CPU information */
+EXTERN(unsigned int) jpeg_simd_cpu_support JPP((void));
+
+/* SIMD Color Space Conversion */
+EXTERN(void) jsimd_rgb_ycc_convert_mmx
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_extrgb_ycc_convert_mmx
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_extrgbx_ycc_convert_mmx
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_extbgr_ycc_convert_mmx
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_extbgrx_ycc_convert_mmx
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_extxbgr_ycc_convert_mmx
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_extxrgb_ycc_convert_mmx
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+
+EXTERN(void) jsimd_rgb_gray_convert_mmx
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_extrgb_gray_convert_mmx
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_extrgbx_gray_convert_mmx
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_extbgr_gray_convert_mmx
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_extbgrx_gray_convert_mmx
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_extxbgr_gray_convert_mmx
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_extxrgb_gray_convert_mmx
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+
+EXTERN(void) jsimd_ycc_rgb_convert_mmx
+        JPP((JDIMENSION out_width,
+             JSAMPIMAGE input_buf, JDIMENSION input_row,
+             JSAMPARRAY output_buf, int num_rows));
+EXTERN(void) jsimd_ycc_extrgb_convert_mmx
+        JPP((JDIMENSION out_width,
+             JSAMPIMAGE input_buf, JDIMENSION input_row,
+             JSAMPARRAY output_buf, int num_rows));
+EXTERN(void) jsimd_ycc_extrgbx_convert_mmx
+        JPP((JDIMENSION out_width,
+             JSAMPIMAGE input_buf, JDIMENSION input_row,
+             JSAMPARRAY output_buf, int num_rows));
+EXTERN(void) jsimd_ycc_extbgr_convert_mmx
+        JPP((JDIMENSION out_width,
+             JSAMPIMAGE input_buf, JDIMENSION input_row,
+             JSAMPARRAY output_buf, int num_rows));
+EXTERN(void) jsimd_ycc_extbgrx_convert_mmx
+        JPP((JDIMENSION out_width,
+             JSAMPIMAGE input_buf, JDIMENSION input_row,
+             JSAMPARRAY output_buf, int num_rows));
+EXTERN(void) jsimd_ycc_extxbgr_convert_mmx
+        JPP((JDIMENSION out_width,
+             JSAMPIMAGE input_buf, JDIMENSION input_row,
+             JSAMPARRAY output_buf, int num_rows));
+EXTERN(void) jsimd_ycc_extxrgb_convert_mmx
+        JPP((JDIMENSION out_width,
+             JSAMPIMAGE input_buf, JDIMENSION input_row,
+             JSAMPARRAY output_buf, int num_rows));
+
+extern const int jconst_rgb_ycc_convert_sse2[];
+EXTERN(void) jsimd_rgb_ycc_convert_sse2
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_extrgb_ycc_convert_sse2
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_extrgbx_ycc_convert_sse2
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_extbgr_ycc_convert_sse2
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_extbgrx_ycc_convert_sse2
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_extxbgr_ycc_convert_sse2
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_extxrgb_ycc_convert_sse2
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+
+extern const int jconst_rgb_gray_convert_sse2[];
+EXTERN(void) jsimd_rgb_gray_convert_sse2
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_extrgb_gray_convert_sse2
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_extrgbx_gray_convert_sse2
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_extbgr_gray_convert_sse2
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_extbgrx_gray_convert_sse2
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_extxbgr_gray_convert_sse2
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_extxrgb_gray_convert_sse2
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+
+extern const int jconst_ycc_rgb_convert_sse2[];
+EXTERN(void) jsimd_ycc_rgb_convert_sse2
+        JPP((JDIMENSION out_width,
+             JSAMPIMAGE input_buf, JDIMENSION input_row,
+             JSAMPARRAY output_buf, int num_rows));
+EXTERN(void) jsimd_ycc_extrgb_convert_sse2
+        JPP((JDIMENSION out_width,
+             JSAMPIMAGE input_buf, JDIMENSION input_row,
+             JSAMPARRAY output_buf, int num_rows));
+EXTERN(void) jsimd_ycc_extrgbx_convert_sse2
+        JPP((JDIMENSION out_width,
+             JSAMPIMAGE input_buf, JDIMENSION input_row,
+             JSAMPARRAY output_buf, int num_rows));
+EXTERN(void) jsimd_ycc_extbgr_convert_sse2
+        JPP((JDIMENSION out_width,
+             JSAMPIMAGE input_buf, JDIMENSION input_row,
+             JSAMPARRAY output_buf, int num_rows));
+EXTERN(void) jsimd_ycc_extbgrx_convert_sse2
+        JPP((JDIMENSION out_width,
+             JSAMPIMAGE input_buf, JDIMENSION input_row,
+             JSAMPARRAY output_buf, int num_rows));
+EXTERN(void) jsimd_ycc_extxbgr_convert_sse2
+        JPP((JDIMENSION out_width,
+             JSAMPIMAGE input_buf, JDIMENSION input_row,
+             JSAMPARRAY output_buf, int num_rows));
+EXTERN(void) jsimd_ycc_extxrgb_convert_sse2
+        JPP((JDIMENSION out_width,
+             JSAMPIMAGE input_buf, JDIMENSION input_row,
+             JSAMPARRAY output_buf, int num_rows));
+
+EXTERN(void) jsimd_rgb_ycc_convert_neon
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_extrgb_ycc_convert_neon
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_extrgbx_ycc_convert_neon
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_extbgr_ycc_convert_neon
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_extbgrx_ycc_convert_neon
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_extxbgr_ycc_convert_neon
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+EXTERN(void) jsimd_extxrgb_ycc_convert_neon
+        JPP((JDIMENSION img_width,
+             JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+             JDIMENSION output_row, int num_rows));
+
+EXTERN(void) jsimd_ycc_rgb_convert_neon
+        JPP((JDIMENSION out_width,
+             JSAMPIMAGE input_buf, JDIMENSION input_row,
+             JSAMPARRAY output_buf, int num_rows));
+EXTERN(void) jsimd_ycc_extrgb_convert_neon
+        JPP((JDIMENSION out_width,
+             JSAMPIMAGE input_buf, JDIMENSION input_row,
+             JSAMPARRAY output_buf, int num_rows));
+EXTERN(void) jsimd_ycc_extrgbx_convert_neon
+        JPP((JDIMENSION out_width,
+             JSAMPIMAGE input_buf, JDIMENSION input_row,
+             JSAMPARRAY output_buf, int num_rows));
+EXTERN(void) jsimd_ycc_extbgr_convert_neon
+        JPP((JDIMENSION out_width,
+             JSAMPIMAGE input_buf, JDIMENSION input_row,
+             JSAMPARRAY output_buf, int num_rows));
+EXTERN(void) jsimd_ycc_extbgrx_convert_neon
+        JPP((JDIMENSION out_width,
+             JSAMPIMAGE input_buf, JDIMENSION input_row,
+             JSAMPARRAY output_buf, int num_rows));
+EXTERN(void) jsimd_ycc_extxbgr_convert_neon
+        JPP((JDIMENSION out_width,
+             JSAMPIMAGE input_buf, JDIMENSION input_row,
+             JSAMPARRAY output_buf, int num_rows));
+EXTERN(void) jsimd_ycc_extxrgb_convert_neon
+        JPP((JDIMENSION out_width,
+             JSAMPIMAGE input_buf, JDIMENSION input_row,
+             JSAMPARRAY output_buf, int num_rows));
+
+/* SIMD Downsample */
+EXTERN(void) jsimd_h2v2_downsample_mmx
+        JPP((JDIMENSION image_width, int max_v_samp_factor,
+             JDIMENSION v_samp_factor, JDIMENSION width_blocks,
+             JSAMPARRAY input_data, JSAMPARRAY output_data));
+EXTERN(void) jsimd_h2v1_downsample_mmx
+        JPP((JDIMENSION image_width, int max_v_samp_factor,
+             JDIMENSION v_samp_factor, JDIMENSION width_blocks,
+             JSAMPARRAY input_data, JSAMPARRAY output_data));
+
+EXTERN(void) jsimd_h2v2_downsample_sse2
+        JPP((JDIMENSION image_width, int max_v_samp_factor,
+             JDIMENSION v_samp_factor, JDIMENSION width_blocks,
+             JSAMPARRAY input_data, JSAMPARRAY output_data));
+EXTERN(void) jsimd_h2v1_downsample_sse2
+        JPP((JDIMENSION image_width, int max_v_samp_factor,
+             JDIMENSION v_samp_factor, JDIMENSION width_blocks,
+             JSAMPARRAY input_data, JSAMPARRAY output_data));
+
+/* SIMD Upsample */
+EXTERN(void) jsimd_h2v2_upsample_mmx
+        JPP((int max_v_samp_factor, JDIMENSION output_width,
+             JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr));
+EXTERN(void) jsimd_h2v1_upsample_mmx
+        JPP((int max_v_samp_factor, JDIMENSION output_width,
+             JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr));
+
+EXTERN(void) jsimd_h2v2_fancy_upsample_mmx
+        JPP((int max_v_samp_factor, JDIMENSION downsampled_width,
+             JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr));
+EXTERN(void) jsimd_h2v1_fancy_upsample_mmx
+        JPP((int max_v_samp_factor, JDIMENSION downsampled_width,
+             JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr));
+
+EXTERN(void) jsimd_h2v2_merged_upsample_mmx
+        JPP((JDIMENSION output_width, JSAMPIMAGE input_buf,
+             JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf));
+EXTERN(void) jsimd_h2v2_extrgb_merged_upsample_mmx
+        JPP((JDIMENSION output_width, JSAMPIMAGE input_buf,
+             JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf));
+EXTERN(void) jsimd_h2v2_extrgbx_merged_upsample_mmx
+        JPP((JDIMENSION output_width, JSAMPIMAGE input_buf,
+             JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf));
+EXTERN(void) jsimd_h2v2_extbgr_merged_upsample_mmx
+        JPP((JDIMENSION output_width, JSAMPIMAGE input_buf,
+             JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf));
+EXTERN(void) jsimd_h2v2_extbgrx_merged_upsample_mmx
+        JPP((JDIMENSION output_width, JSAMPIMAGE input_buf,
+             JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf));
+EXTERN(void) jsimd_h2v2_extxbgr_merged_upsample_mmx
+        JPP((JDIMENSION output_width, JSAMPIMAGE input_buf,
+             JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf));
+EXTERN(void) jsimd_h2v2_extxrgb_merged_upsample_mmx
+        JPP((JDIMENSION output_width, JSAMPIMAGE input_buf,
+             JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf));
+EXTERN(void) jsimd_h2v1_merged_upsample_mmx
+        JPP((JDIMENSION output_width, JSAMPIMAGE input_buf,
+             JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf));
+EXTERN(void) jsimd_h2v1_extrgb_merged_upsample_mmx
+        JPP((JDIMENSION output_width, JSAMPIMAGE input_buf,
+             JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf));
+EXTERN(void) jsimd_h2v1_extrgbx_merged_upsample_mmx
+        JPP((JDIMENSION output_width, JSAMPIMAGE input_buf,
+             JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf));
+EXTERN(void) jsimd_h2v1_extbgr_merged_upsample_mmx
+        JPP((JDIMENSION output_width, JSAMPIMAGE input_buf,
+             JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf));
+EXTERN(void) jsimd_h2v1_extbgrx_merged_upsample_mmx
+        JPP((JDIMENSION output_width, JSAMPIMAGE input_buf,
+             JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf));
+EXTERN(void) jsimd_h2v1_extxbgr_merged_upsample_mmx
+        JPP((JDIMENSION output_width, JSAMPIMAGE input_buf,
+             JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf));
+EXTERN(void) jsimd_h2v1_extxrgb_merged_upsample_mmx
+        JPP((JDIMENSION output_width, JSAMPIMAGE input_buf,
+             JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf));
+
+EXTERN(void) jsimd_h2v2_upsample_sse2
+        JPP((int max_v_samp_factor, JDIMENSION output_width,
+             JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr));
+EXTERN(void) jsimd_h2v1_upsample_sse2
+        JPP((int max_v_samp_factor, JDIMENSION output_width,
+             JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr));
+
+extern const int jconst_fancy_upsample_sse2[];
+EXTERN(void) jsimd_h2v2_fancy_upsample_sse2
+        JPP((int max_v_samp_factor, JDIMENSION downsampled_width,
+             JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr));
+EXTERN(void) jsimd_h2v1_fancy_upsample_sse2
+        JPP((int max_v_samp_factor, JDIMENSION downsampled_width,
+             JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr));
+
+extern const int jconst_merged_upsample_sse2[];
+EXTERN(void) jsimd_h2v2_merged_upsample_sse2
+        JPP((JDIMENSION output_width, JSAMPIMAGE input_buf,
+             JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf));
+EXTERN(void) jsimd_h2v2_extrgb_merged_upsample_sse2
+        JPP((JDIMENSION output_width, JSAMPIMAGE input_buf,
+             JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf));
+EXTERN(void) jsimd_h2v2_extrgbx_merged_upsample_sse2
+        JPP((JDIMENSION output_width, JSAMPIMAGE input_buf,
+             JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf));
+EXTERN(void) jsimd_h2v2_extbgr_merged_upsample_sse2
+        JPP((JDIMENSION output_width, JSAMPIMAGE input_buf,
+             JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf));
+EXTERN(void) jsimd_h2v2_extbgrx_merged_upsample_sse2
+        JPP((JDIMENSION output_width, JSAMPIMAGE input_buf,
+             JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf));
+EXTERN(void) jsimd_h2v2_extxbgr_merged_upsample_sse2
+        JPP((JDIMENSION output_width, JSAMPIMAGE input_buf,
+             JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf));
+EXTERN(void) jsimd_h2v2_extxrgb_merged_upsample_sse2
+        JPP((JDIMENSION output_width, JSAMPIMAGE input_buf,
+             JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf));
+EXTERN(void) jsimd_h2v1_merged_upsample_sse2
+        JPP((JDIMENSION output_width, JSAMPIMAGE input_buf,
+             JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf));
+EXTERN(void) jsimd_h2v1_extrgb_merged_upsample_sse2
+        JPP((JDIMENSION output_width, JSAMPIMAGE input_buf,
+             JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf));
+EXTERN(void) jsimd_h2v1_extrgbx_merged_upsample_sse2
+        JPP((JDIMENSION output_width, JSAMPIMAGE input_buf,
+             JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf));
+EXTERN(void) jsimd_h2v1_extbgr_merged_upsample_sse2
+        JPP((JDIMENSION output_width, JSAMPIMAGE input_buf,
+             JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf));
+EXTERN(void) jsimd_h2v1_extbgrx_merged_upsample_sse2
+        JPP((JDIMENSION output_width, JSAMPIMAGE input_buf,
+             JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf));
+EXTERN(void) jsimd_h2v1_extxbgr_merged_upsample_sse2
+        JPP((JDIMENSION output_width, JSAMPIMAGE input_buf,
+             JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf));
+EXTERN(void) jsimd_h2v1_extxrgb_merged_upsample_sse2
+        JPP((JDIMENSION output_width, JSAMPIMAGE input_buf,
+             JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf));
+
+/* SIMD Sample Conversion */
+EXTERN(void) jsimd_convsamp_mmx JPP((JSAMPARRAY sample_data,
+                                     JDIMENSION start_col,
+                                     DCTELEM * workspace));
+
+EXTERN(void) jsimd_convsamp_sse2 JPP((JSAMPARRAY sample_data,
+                                      JDIMENSION start_col,
+                                      DCTELEM * workspace));
+
+EXTERN(void) jsimd_convsamp_neon JPP((JSAMPARRAY sample_data,
+                                      JDIMENSION start_col,
+                                      DCTELEM * workspace));
+
+EXTERN(void) jsimd_convsamp_float_3dnow JPP((JSAMPARRAY sample_data,
+                                             JDIMENSION start_col,
+                                             FAST_FLOAT * workspace));
+
+EXTERN(void) jsimd_convsamp_float_sse JPP((JSAMPARRAY sample_data,
+                                           JDIMENSION start_col,
+                                           FAST_FLOAT * workspace));
+
+EXTERN(void) jsimd_convsamp_float_sse2 JPP((JSAMPARRAY sample_data,
+                                            JDIMENSION start_col,
+                                            FAST_FLOAT * workspace));
+
+/* SIMD Forward DCT */
+EXTERN(void) jsimd_fdct_islow_mmx JPP((DCTELEM * data));
+EXTERN(void) jsimd_fdct_ifast_mmx JPP((DCTELEM * data));
+
+extern const int jconst_fdct_ifast_sse2[];
+EXTERN(void) jsimd_fdct_islow_sse2 JPP((DCTELEM * data));
+extern const int jconst_fdct_islow_sse2[];
+EXTERN(void) jsimd_fdct_ifast_sse2 JPP((DCTELEM * data));
+
+EXTERN(void) jsimd_fdct_ifast_neon JPP((DCTELEM * data));
+
+EXTERN(void) jsimd_fdct_float_3dnow JPP((FAST_FLOAT * data));
+
+extern const int jconst_fdct_float_sse[];
+EXTERN(void) jsimd_fdct_float_sse JPP((FAST_FLOAT * data));
+
+/* SIMD Quantization */
+EXTERN(void) jsimd_quantize_mmx JPP((JCOEFPTR coef_block,
+                                     DCTELEM * divisors,
+                                     DCTELEM * workspace));
+
+EXTERN(void) jsimd_quantize_sse2 JPP((JCOEFPTR coef_block,
+                                      DCTELEM * divisors,
+                                      DCTELEM * workspace));
+
+EXTERN(void) jsimd_quantize_neon JPP((JCOEFPTR coef_block,
+                                      DCTELEM * divisors,
+                                      DCTELEM * workspace));
+
+EXTERN(void) jsimd_quantize_float_3dnow JPP((JCOEFPTR coef_block,
+                                             FAST_FLOAT * divisors,
+                                             FAST_FLOAT * workspace));
+
+EXTERN(void) jsimd_quantize_float_sse JPP((JCOEFPTR coef_block,
+                                           FAST_FLOAT * divisors,
+                                           FAST_FLOAT * workspace));
+
+EXTERN(void) jsimd_quantize_float_sse2 JPP((JCOEFPTR coef_block,
+                                            FAST_FLOAT * divisors,
+                                            FAST_FLOAT * workspace));
+
+/* SIMD Reduced Inverse DCT */
+EXTERN(void) jsimd_idct_2x2_mmx JPP((void * dct_table,
+                                     JCOEFPTR coef_block,
+                                     JSAMPARRAY output_buf,
+                                     JDIMENSION output_col));
+EXTERN(void) jsimd_idct_4x4_mmx JPP((void * dct_table,
+                                     JCOEFPTR coef_block,
+                                     JSAMPARRAY output_buf,
+                                     JDIMENSION output_col));
+
+extern const int jconst_idct_red_sse2[];
+EXTERN(void) jsimd_idct_2x2_sse2 JPP((void * dct_table,
+                                      JCOEFPTR coef_block,
+                                      JSAMPARRAY output_buf,
+                                      JDIMENSION output_col));
+EXTERN(void) jsimd_idct_4x4_sse2 JPP((void * dct_table,
+                                      JCOEFPTR coef_block,
+                                      JSAMPARRAY output_buf,
+                                      JDIMENSION output_col));
+
+EXTERN(void) jsimd_idct_2x2_neon JPP((void * dct_table,
+                                      JCOEFPTR coef_block,
+                                      JSAMPARRAY output_buf,
+                                      JDIMENSION output_col));
+EXTERN(void) jsimd_idct_4x4_neon JPP((void * dct_table,
+                                      JCOEFPTR coef_block,
+                                      JSAMPARRAY output_buf,
+                                      JDIMENSION output_col));
+
+/* SIMD Inverse DCT */
+EXTERN(void) jsimd_idct_islow_mmx JPP((void * dct_table,
+                                       JCOEFPTR coef_block,
+                                       JSAMPARRAY output_buf,
+                                       JDIMENSION output_col));
+EXTERN(void) jsimd_idct_ifast_mmx JPP((void * dct_table,
+                                       JCOEFPTR coef_block,
+                                       JSAMPARRAY output_buf,
+                                       JDIMENSION output_col));
+
+extern const int jconst_idct_islow_sse2[];
+EXTERN(void) jsimd_idct_islow_sse2 JPP((void * dct_table,
+                                        JCOEFPTR coef_block,
+                                        JSAMPARRAY output_buf,
+                                        JDIMENSION output_col));
+extern const int jconst_idct_ifast_sse2[];
+EXTERN(void) jsimd_idct_ifast_sse2 JPP((void * dct_table,
+                                        JCOEFPTR coef_block,
+                                        JSAMPARRAY output_buf,
+                                        JDIMENSION output_col));
+
+EXTERN(void) jsimd_idct_islow_neon JPP((void * dct_table,
+                                        JCOEFPTR coef_block,
+                                        JSAMPARRAY output_buf,
+                                        JDIMENSION output_col));
+EXTERN(void) jsimd_idct_ifast_neon JPP((void * dct_table,
+                                        JCOEFPTR coef_block,
+                                        JSAMPARRAY output_buf,
+                                        JDIMENSION output_col));
+
+EXTERN(void) jsimd_idct_float_3dnow JPP((void * dct_table,
+                                         JCOEFPTR coef_block,
+                                         JSAMPARRAY output_buf,
+                                         JDIMENSION output_col));
+
+extern const int jconst_idct_float_sse[];
+EXTERN(void) jsimd_idct_float_sse JPP((void * dct_table,
+                                       JCOEFPTR coef_block,
+                                       JSAMPARRAY output_buf,
+                                       JDIMENSION output_col));
+
+extern const int jconst_idct_float_sse2[];
+EXTERN(void) jsimd_idct_float_sse2 JPP((void * dct_table,
+                                        JCOEFPTR coef_block,
+                                        JSAMPARRAY output_buf,
+                                        JDIMENSION output_col));
+
diff --git a/src/libjpeg-turbo/simd/jsimd_arm.c b/src/libjpeg-turbo/simd/jsimd_arm.c
new file mode 100644
index 0000000..af0c2c8
--- /dev/null
+++ b/src/libjpeg-turbo/simd/jsimd_arm.c
@@ -0,0 +1,670 @@
+/*
+ * jsimd_arm.c
+ *
+ * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+ * Copyright 2009-2011 D. R. Commander
+ * 
+ * Based on the x86 SIMD extension for IJG JPEG library,
+ * Copyright (C) 1999-2006, MIYASAKA Masaru.
+ * For conditions of distribution and use, see copyright notice in jsimdext.inc
+ *
+ * This file contains the interface between the "normal" portions
+ * of the library and the SIMD implementations when running on
+ * ARM architecture.
+ *
+ * Based on the stubs from 'jsimd_none.c'
+ */
+
+#define JPEG_INTERNALS
+#include "../jinclude.h"
+#include "../jpeglib.h"
+#include "../jsimd.h"
+#include "../jdct.h"
+#include "../jsimddct.h"
+#include "jsimd.h"
+
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+
+static unsigned int simd_support = ~0;
+
+#if defined(__linux__) || defined(ANDROID) || defined(__ANDROID__)
+
+#define SOMEWHAT_SANE_PROC_CPUINFO_SIZE_LIMIT (1024 * 1024)
+
+LOCAL(int)
+check_feature (char *buffer, char *feature)
+{
+  char *p;
+  if (*feature == 0)
+    return 0;
+  if (strncmp(buffer, "Features", 8) != 0)
+    return 0;
+  buffer += 8;
+  while (isspace(*buffer))
+    buffer++;
+
+  /* Check if 'feature' is present in the buffer as a separate word */
+  while ((p = strstr(buffer, feature))) {
+    if (p > buffer && !isspace(*(p - 1))) {
+      buffer++;
+      continue;
+    }
+    p += strlen(feature);
+    if (*p != 0 && !isspace(*p)) {
+      buffer++;
+      continue;
+    }
+    return 1;
+  }
+  return 0;
+}
+
+LOCAL(int)
+parse_proc_cpuinfo (int bufsize)
+{
+  char *buffer = (char *)malloc(bufsize);
+  FILE *fd;
+  simd_support = 0;
+
+  if (!buffer)
+    return 0;
+
+  fd = fopen("/proc/cpuinfo", "r");
+  if (fd) {
+    while (fgets(buffer, bufsize, fd)) {
+      if (!strchr(buffer, '\n') && !feof(fd)) {
+        /* "impossible" happened - insufficient size of the buffer! */
+        fclose(fd);
+        free(buffer);
+        return 0;
+      }
+      if (check_feature(buffer, "neon"))
+        simd_support |= JSIMD_ARM_NEON;
+    }
+    fclose(fd);
+  }
+  free(buffer);
+  return 1;
+}
+
+#endif
+
+/*
+ * Check what SIMD accelerations are supported.
+ *
+ * FIXME: This code is racy under a multi-threaded environment.
+ */
+LOCAL(void)
+init_simd (void)
+{
+  char *env = NULL;
+#if !defined(__ARM_NEON__) && defined(__linux__) || defined(ANDROID) || defined(__ANDROID__)
+  int bufsize = 1024; /* an initial guess for the line buffer size limit */
+#endif
+
+  if (simd_support != ~0U)
+    return;
+
+  simd_support = 0;
+
+#if defined(__ARM_NEON__)
+  simd_support |= JSIMD_ARM_NEON;
+#elif defined(__linux__) || defined(ANDROID) || defined(__ANDROID__)
+  /* We still have a chance to use NEON regardless of globally used
+   * -mcpu/-mfpu options passed to gcc by performing runtime detection via
+   * /proc/cpuinfo parsing on linux/android */
+  while (!parse_proc_cpuinfo(bufsize)) {
+    bufsize *= 2;
+    if (bufsize > SOMEWHAT_SANE_PROC_CPUINFO_SIZE_LIMIT)
+      break;
+  }
+#endif
+
+  /* Force different settings through environment variables */
+  env = getenv("JSIMD_FORCE_ARM_NEON");
+  if ((env != NULL) && (strcmp(env, "1") == 0))
+    simd_support &= JSIMD_ARM_NEON;
+  env = getenv("JSIMD_FORCE_NO_SIMD");
+  if ((env != NULL) && (strcmp(env, "1") == 0))
+    simd_support = 0;
+}
+
+GLOBAL(int)
+jsimd_can_rgb_ycc (void)
+{
+  init_simd();
+
+  /* The code is optimised for these values only */
+  if (BITS_IN_JSAMPLE != 8)
+    return 0;
+  if (sizeof(JDIMENSION) != 4)
+    return 0;
+  if ((RGB_PIXELSIZE != 3) && (RGB_PIXELSIZE != 4))
+    return 0;
+
+  if (simd_support & JSIMD_ARM_NEON)
+    return 1;
+
+  return 0;
+}
+
+GLOBAL(int)
+jsimd_can_rgb_gray (void)
+{
+  init_simd();
+
+  return 0;
+}
+
+GLOBAL(int)
+jsimd_can_ycc_rgb (void)
+{
+  init_simd();
+
+  /* The code is optimised for these values only */
+  if (BITS_IN_JSAMPLE != 8)
+    return 0;
+  if (sizeof(JDIMENSION) != 4)
+    return 0;
+  if ((RGB_PIXELSIZE != 3) && (RGB_PIXELSIZE != 4))
+    return 0;
+  if (simd_support & JSIMD_ARM_NEON)
+    return 1;
+
+  return 0;
+}
+
+GLOBAL(void)
+jsimd_rgb_ycc_convert (j_compress_ptr cinfo,
+                       JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+                       JDIMENSION output_row, int num_rows)
+{
+  void (*neonfct)(JDIMENSION, JSAMPARRAY, JSAMPIMAGE, JDIMENSION, int);
+
+  switch(cinfo->in_color_space)
+  {
+    case JCS_EXT_RGB:
+      neonfct=jsimd_extrgb_ycc_convert_neon;
+      break;
+    case JCS_EXT_RGBX:
+    case JCS_EXT_RGBA:
+      neonfct=jsimd_extrgbx_ycc_convert_neon;
+      break;
+    case JCS_EXT_BGR:
+      neonfct=jsimd_extbgr_ycc_convert_neon;
+      break;
+    case JCS_EXT_BGRX:
+    case JCS_EXT_BGRA:
+      neonfct=jsimd_extbgrx_ycc_convert_neon;
+      break;
+    case JCS_EXT_XBGR:
+    case JCS_EXT_ABGR:
+      neonfct=jsimd_extxbgr_ycc_convert_neon;
+      break;
+    case JCS_EXT_XRGB:
+    case JCS_EXT_ARGB:
+      neonfct=jsimd_extxrgb_ycc_convert_neon;
+      break;
+    default:
+      neonfct=jsimd_extrgb_ycc_convert_neon;
+      break;
+  }
+
+  if (simd_support & JSIMD_ARM_NEON)
+    neonfct(cinfo->image_width, input_buf,
+        output_buf, output_row, num_rows);
+}
+
+GLOBAL(void)
+jsimd_rgb_gray_convert (j_compress_ptr cinfo,
+                        JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
+                        JDIMENSION output_row, int num_rows)
+{
+}
+
+GLOBAL(void)
+jsimd_ycc_rgb_convert (j_decompress_ptr cinfo,
+                       JSAMPIMAGE input_buf, JDIMENSION input_row,
+                       JSAMPARRAY output_buf, int num_rows)
+{
+  void (*neonfct)(JDIMENSION, JSAMPIMAGE, JDIMENSION, JSAMPARRAY, int);
+
+  switch(cinfo->out_color_space)
+  {
+    case JCS_EXT_RGB:
+      neonfct=jsimd_ycc_extrgb_convert_neon;
+      break;
+    case JCS_EXT_RGBX:
+    case JCS_EXT_RGBA:
+      neonfct=jsimd_ycc_extrgbx_convert_neon;
+      break;
+    case JCS_EXT_BGR:
+      neonfct=jsimd_ycc_extbgr_convert_neon;
+      break;
+    case JCS_EXT_BGRX:
+    case JCS_EXT_BGRA:
+      neonfct=jsimd_ycc_extbgrx_convert_neon;
+      break;
+    case JCS_EXT_XBGR:
+    case JCS_EXT_ABGR:
+      neonfct=jsimd_ycc_extxbgr_convert_neon;
+      break;
+    case JCS_EXT_XRGB:
+    case JCS_EXT_ARGB:
+      neonfct=jsimd_ycc_extxrgb_convert_neon;
+      break;
+  default:
+      neonfct=jsimd_ycc_extrgb_convert_neon;
+      break;
+  }
+
+  if (simd_support & JSIMD_ARM_NEON)
+    neonfct(cinfo->output_width, input_buf,
+        input_row, output_buf, num_rows);
+}
+
+GLOBAL(int)
+jsimd_can_h2v2_downsample (void)
+{
+  init_simd();
+
+  return 0;
+}
+
+GLOBAL(int)
+jsimd_can_h2v1_downsample (void)
+{
+  init_simd();
+
+  return 0;
+}
+
+GLOBAL(void)
+jsimd_h2v2_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
+                       JSAMPARRAY input_data, JSAMPARRAY output_data)
+{
+}
+
+GLOBAL(void)
+jsimd_h2v1_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
+                       JSAMPARRAY input_data, JSAMPARRAY output_data)
+{
+}
+
+GLOBAL(int)
+jsimd_can_h2v2_upsample (void)
+{
+  init_simd();
+
+  return 0;
+}
+
+GLOBAL(int)
+jsimd_can_h2v1_upsample (void)
+{
+  init_simd();
+
+  return 0;
+}
+
+GLOBAL(void)
+jsimd_h2v2_upsample (j_decompress_ptr cinfo,
+                     jpeg_component_info * compptr, 
+                     JSAMPARRAY input_data,
+                     JSAMPARRAY * output_data_ptr)
+{
+}
+
+GLOBAL(void)
+jsimd_h2v1_upsample (j_decompress_ptr cinfo,
+                     jpeg_component_info * compptr, 
+                     JSAMPARRAY input_data,
+                     JSAMPARRAY * output_data_ptr)
+{
+}
+
+GLOBAL(int)
+jsimd_can_h2v2_fancy_upsample (void)
+{
+  init_simd();
+
+  return 0;
+}
+
+GLOBAL(int)
+jsimd_can_h2v1_fancy_upsample (void)
+{
+  init_simd();
+
+  return 0;
+}
+
+GLOBAL(void)
+jsimd_h2v2_fancy_upsample (j_decompress_ptr cinfo,
+                           jpeg_component_info * compptr, 
+                           JSAMPARRAY input_data,
+                           JSAMPARRAY * output_data_ptr)
+{
+}
+
+GLOBAL(void)
+jsimd_h2v1_fancy_upsample (j_decompress_ptr cinfo,
+                           jpeg_component_info * compptr, 
+                           JSAMPARRAY input_data,
+                           JSAMPARRAY * output_data_ptr)
+{
+}
+
+GLOBAL(int)
+jsimd_can_h2v2_merged_upsample (void)
+{
+  init_simd();
+
+  return 0;
+}
+
+GLOBAL(int)
+jsimd_can_h2v1_merged_upsample (void)
+{
+  init_simd();
+
+  return 0;
+}
+
+GLOBAL(void)
+jsimd_h2v2_merged_upsample (j_decompress_ptr cinfo,
+                            JSAMPIMAGE input_buf,
+                            JDIMENSION in_row_group_ctr,
+                            JSAMPARRAY output_buf)
+{
+}
+
+GLOBAL(void)
+jsimd_h2v1_merged_upsample (j_decompress_ptr cinfo,
+                            JSAMPIMAGE input_buf,
+                            JDIMENSION in_row_group_ctr,
+                            JSAMPARRAY output_buf)
+{
+}
+
+GLOBAL(int)
+jsimd_can_convsamp (void)
+{
+  init_simd();
+
+  /* The code is optimised for these values only */
+  if (DCTSIZE != 8)
+    return 0;
+  if (BITS_IN_JSAMPLE != 8)
+    return 0;
+  if (sizeof(JDIMENSION) != 4)
+    return 0;
+  if (sizeof(DCTELEM) != 2)
+    return 0;
+
+  if (simd_support & JSIMD_ARM_NEON)
+    return 1;
+
+  return 0;
+}
+
+GLOBAL(int)
+jsimd_can_convsamp_float (void)
+{
+  init_simd();
+
+  return 0;
+}
+
+GLOBAL(void)
+jsimd_convsamp (JSAMPARRAY sample_data, JDIMENSION start_col,
+                DCTELEM * workspace)
+{
+  if (simd_support & JSIMD_ARM_NEON)
+    jsimd_convsamp_neon(sample_data, start_col, workspace);
+}
+
+GLOBAL(void)
+jsimd_convsamp_float (JSAMPARRAY sample_data, JDIMENSION start_col,
+                      FAST_FLOAT * workspace)
+{
+}
+
+GLOBAL(int)
+jsimd_can_fdct_islow (void)
+{
+  init_simd();
+
+  return 0;
+}
+
+GLOBAL(int)
+jsimd_can_fdct_ifast (void)
+{
+  init_simd();
+
+  /* The code is optimised for these values only */
+  if (DCTSIZE != 8)
+    return 0;
+  if (sizeof(DCTELEM) != 2)
+    return 0;
+
+  if (simd_support & JSIMD_ARM_NEON)
+    return 1;
+
+  return 0;
+}
+
+GLOBAL(int)
+jsimd_can_fdct_float (void)
+{
+  init_simd();
+
+  return 0;
+}
+
+GLOBAL(void)
+jsimd_fdct_islow (DCTELEM * data)
+{
+}
+
+GLOBAL(void)
+jsimd_fdct_ifast (DCTELEM * data)
+{
+  if (simd_support & JSIMD_ARM_NEON)
+    jsimd_fdct_ifast_neon(data);
+}
+
+GLOBAL(void)
+jsimd_fdct_float (FAST_FLOAT * data)
+{
+}
+
+GLOBAL(int)
+jsimd_can_quantize (void)
+{
+  init_simd();
+
+  /* The code is optimised for these values only */
+  if (DCTSIZE != 8)
+    return 0;
+  if (sizeof(JCOEF) != 2)
+    return 0;
+  if (sizeof(DCTELEM) != 2)
+    return 0;
+
+  if (simd_support & JSIMD_ARM_NEON)
+    return 1;
+
+  return 0;
+}
+
+GLOBAL(int)
+jsimd_can_quantize_float (void)
+{
+  init_simd();
+
+  return 0;
+}
+
+GLOBAL(void)
+jsimd_quantize (JCOEFPTR coef_block, DCTELEM * divisors,
+                DCTELEM * workspace)
+{
+  if (simd_support & JSIMD_ARM_NEON)
+    jsimd_quantize_neon(coef_block, divisors, workspace);
+}
+
+GLOBAL(void)
+jsimd_quantize_float (JCOEFPTR coef_block, FAST_FLOAT * divisors,
+                      FAST_FLOAT * workspace)
+{
+}
+
+GLOBAL(int)
+jsimd_can_idct_2x2 (void)
+{
+  init_simd();
+
+  /* The code is optimised for these values only */
+  if (DCTSIZE != 8)
+    return 0;
+  if (sizeof(JCOEF) != 2)
+    return 0;
+  if (BITS_IN_JSAMPLE != 8)
+    return 0;
+  if (sizeof(JDIMENSION) != 4)
+    return 0;
+  if (sizeof(ISLOW_MULT_TYPE) != 2)
+    return 0;
+
+  if ((simd_support & JSIMD_ARM_NEON))
+    return 1;
+
+  return 0;
+}
+
+GLOBAL(int)
+jsimd_can_idct_4x4 (void)
+{
+  init_simd();
+
+  /* The code is optimised for these values only */
+  if (DCTSIZE != 8)
+    return 0;
+  if (sizeof(JCOEF) != 2)
+    return 0;
+  if (BITS_IN_JSAMPLE != 8)
+    return 0;
+  if (sizeof(JDIMENSION) != 4)
+    return 0;
+  if (sizeof(ISLOW_MULT_TYPE) != 2)
+    return 0;
+
+  if ((simd_support & JSIMD_ARM_NEON))
+    return 1;
+
+  return 0;
+}
+
+GLOBAL(void)
+jsimd_idct_2x2 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
+                JCOEFPTR coef_block, JSAMPARRAY output_buf,
+                JDIMENSION output_col)
+{
+  if ((simd_support & JSIMD_ARM_NEON))
+    jsimd_idct_2x2_neon(compptr->dct_table, coef_block, output_buf, output_col);
+}
+
+GLOBAL(void)
+jsimd_idct_4x4 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
+                JCOEFPTR coef_block, JSAMPARRAY output_buf,
+                JDIMENSION output_col)
+{
+  if ((simd_support & JSIMD_ARM_NEON))
+    jsimd_idct_4x4_neon(compptr->dct_table, coef_block, output_buf, output_col);
+}
+
+GLOBAL(int)
+jsimd_can_idct_islow (void)
+{
+  init_simd();
+
+  /* The code is optimised for these values only */
+  if (DCTSIZE != 8)
+    return 0;
+  if (sizeof(JCOEF) != 2)
+    return 0;
+  if (BITS_IN_JSAMPLE != 8)
+    return 0;
+  if (sizeof(JDIMENSION) != 4)
+    return 0;
+  if (sizeof(ISLOW_MULT_TYPE) != 2)
+    return 0;
+
+  if (simd_support & JSIMD_ARM_NEON)
+    return 1;
+
+  return 0;
+}
+
+GLOBAL(int)
+jsimd_can_idct_ifast (void)
+{
+  init_simd();
+
+  /* The code is optimised for these values only */
+  if (DCTSIZE != 8)
+    return 0;
+  if (sizeof(JCOEF) != 2)
+    return 0;
+  if (BITS_IN_JSAMPLE != 8)
+    return 0;
+  if (sizeof(JDIMENSION) != 4)
+    return 0;
+  if (sizeof(IFAST_MULT_TYPE) != 2)
+    return 0;
+  if (IFAST_SCALE_BITS != 2)
+    return 0;
+
+  if ((simd_support & JSIMD_ARM_NEON))
+    return 1;
+
+  return 0;
+}
+
+GLOBAL(int)
+jsimd_can_idct_float (void)
+{
+  init_simd();
+
+  return 0;
+}
+
+GLOBAL(void)
+jsimd_idct_islow (j_decompress_ptr cinfo, jpeg_component_info * compptr,
+                JCOEFPTR coef_block, JSAMPARRAY output_buf,
+                JDIMENSION output_col)
+{
+  if ((simd_support & JSIMD_ARM_NEON))
+    jsimd_idct_islow_neon(compptr->dct_table, coef_block, output_buf, output_col);
+}
+
+GLOBAL(void)
+jsimd_idct_ifast (j_decompress_ptr cinfo, jpeg_component_info * compptr,
+                JCOEFPTR coef_block, JSAMPARRAY output_buf,
+                JDIMENSION output_col)
+{
+  if ((simd_support & JSIMD_ARM_NEON))
+    jsimd_idct_ifast_neon(compptr->dct_table, coef_block, output_buf, output_col);
+}
+
+GLOBAL(void)
+jsimd_idct_float (j_decompress_ptr cinfo, jpeg_component_info * compptr,
+                JCOEFPTR coef_block, JSAMPARRAY output_buf,
+                JDIMENSION output_col)
+{
+}
+
diff --git a/src/libjpeg-turbo/simd/jsimd_arm_neon.S b/src/libjpeg-turbo/simd/jsimd_arm_neon.S
new file mode 100644
index 0000000..b2f9c2a
--- /dev/null
+++ b/src/libjpeg-turbo/simd/jsimd_arm_neon.S
@@ -0,0 +1,2159 @@
+/*
+ * ARM NEON optimizations for libjpeg-turbo
+ *
+ * Copyright (C) 2009-2011 Nokia Corporation and/or its subsidiary(-ies).
+ * All rights reserved.
+ * Author: Siarhei Siamashka <siarhei.siamashka@nokia.com>
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty.  In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ *    claim that you wrote the original software. If you use this software
+ *    in a product, an acknowledgment in the product documentation would be
+ *    appreciated but is not required.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ *    misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ */
+
+#if defined(__linux__) && defined(__ELF__)
+.section .note.GNU-stack,"",%progbits /* mark stack as non-executable */
+#endif
+
+.text
+.fpu neon
+.arch armv7a
+.object_arch armv4
+.arm
+
+
+#define RESPECT_STRICT_ALIGNMENT 1
+
+/*****************************************************************************/
+
+/* Supplementary macro for setting function attributes */
+.macro asm_function fname
+#ifdef __APPLE__
+    .func _\fname
+    .globl _\fname
+_\fname:
+#else
+    .func \fname
+    .global \fname
+#ifdef __ELF__
+    .hidden \fname
+    .type \fname, %function
+#endif
+\fname:
+#endif
+.endm
+
+/* Transpose a block of 4x4 coefficients in four 64-bit registers */
+.macro transpose_4x4 x0, x1, x2, x3
+    vtrn.16 \x0, \x1
+    vtrn.16 \x2, \x3
+    vtrn.32 \x0, \x2
+    vtrn.32 \x1, \x3
+.endm
+
+#define CENTERJSAMPLE 128
+
+/*****************************************************************************/
+
+/*
+ * Perform dequantization and inverse DCT on one block of coefficients.
+ *
+ * GLOBAL(void)
+ * jsimd_idct_islow_neon (void * dct_table, JCOEFPTR coef_block,
+ *                        JSAMPARRAY output_buf, JDIMENSION output_col)
+ */
+
+#define FIX_0_298631336  (2446)
+#define FIX_0_390180644  (3196)
+#define FIX_0_541196100  (4433)
+#define FIX_0_765366865  (6270)
+#define FIX_0_899976223  (7373)
+#define FIX_1_175875602  (9633)
+#define FIX_1_501321110  (12299)
+#define FIX_1_847759065  (15137)
+#define FIX_1_961570560  (16069)
+#define FIX_2_053119869  (16819)
+#define FIX_2_562915447  (20995)
+#define FIX_3_072711026  (25172)
+
+#define FIX_1_175875602_MINUS_1_961570560 (FIX_1_175875602 - FIX_1_961570560)
+#define FIX_1_175875602_MINUS_0_390180644 (FIX_1_175875602 - FIX_0_390180644)
+#define FIX_0_541196100_MINUS_1_847759065 (FIX_0_541196100 - FIX_1_847759065)
+#define FIX_3_072711026_MINUS_2_562915447 (FIX_3_072711026 - FIX_2_562915447)
+#define FIX_0_298631336_MINUS_0_899976223 (FIX_0_298631336 - FIX_0_899976223)
+#define FIX_1_501321110_MINUS_0_899976223 (FIX_1_501321110 - FIX_0_899976223)
+#define FIX_2_053119869_MINUS_2_562915447 (FIX_2_053119869 - FIX_2_562915447)
+#define FIX_0_541196100_PLUS_0_765366865  (FIX_0_541196100 + FIX_0_765366865)
+
+/*
+ * Reference SIMD-friendly 1-D ISLOW iDCT C implementation.
+ * Uses some ideas from the comments in 'simd/jiss2int-64.asm'
+ */
+#define REF_1D_IDCT(xrow0, xrow1, xrow2, xrow3, xrow4, xrow5, xrow6, xrow7)   \
+{                                                                             \
+    DCTELEM row0, row1, row2, row3, row4, row5, row6, row7;                   \
+    INT32   q1, q2, q3, q4, q5, q6, q7;                                       \
+    INT32   tmp11_plus_tmp2, tmp11_minus_tmp2;                                \
+                                                                              \
+    /* 1-D iDCT input data */                                                 \
+    row0 = xrow0;                                                             \
+    row1 = xrow1;                                                             \
+    row2 = xrow2;                                                             \
+    row3 = xrow3;                                                             \
+    row4 = xrow4;                                                             \
+    row5 = xrow5;                                                             \
+    row6 = xrow6;                                                             \
+    row7 = xrow7;                                                             \
+                                                                              \
+    q5 = row7 + row3;                                                         \
+    q4 = row5 + row1;                                                         \
+    q6 = MULTIPLY(q5, FIX_1_175875602_MINUS_1_961570560) +                    \
+         MULTIPLY(q4, FIX_1_175875602);                                       \
+    q7 = MULTIPLY(q5, FIX_1_175875602) +                                      \
+         MULTIPLY(q4, FIX_1_175875602_MINUS_0_390180644);                     \
+    q2 = MULTIPLY(row2, FIX_0_541196100) +                                    \
+         MULTIPLY(row6, FIX_0_541196100_MINUS_1_847759065);                   \
+    q4 = q6;                                                                  \
+    q3 = ((INT32) row0 - (INT32) row4) << 13;                                 \
+    q6 += MULTIPLY(row5, -FIX_2_562915447) +                                  \
+          MULTIPLY(row3, FIX_3_072711026_MINUS_2_562915447);                  \
+    /* now we can use q1 (reloadable constants have been used up) */          \
+    q1 = q3 + q2;                                                             \
+    q4 += MULTIPLY(row7, FIX_0_298631336_MINUS_0_899976223) +                 \
+          MULTIPLY(row1, -FIX_0_899976223);                                   \
+    q5 = q7;                                                                  \
+    q1 = q1 + q6;                                                             \
+    q7 += MULTIPLY(row7, -FIX_0_899976223) +                                  \
+          MULTIPLY(row1, FIX_1_501321110_MINUS_0_899976223);                  \
+                                                                              \
+    /* (tmp11 + tmp2) has been calculated (out_row1 before descale) */        \
+    tmp11_plus_tmp2 = q1;                                                     \
+    row1 = 0;                                                                 \
+                                                                              \
+    q1 = q1 - q6;                                                             \
+    q5 += MULTIPLY(row5, FIX_2_053119869_MINUS_2_562915447) +                 \
+          MULTIPLY(row3, -FIX_2_562915447);                                   \
+    q1 = q1 - q6;                                                             \
+    q6 = MULTIPLY(row2, FIX_0_541196100_PLUS_0_765366865) +                   \
+         MULTIPLY(row6, FIX_0_541196100);                                     \
+    q3 = q3 - q2;                                                             \
+                                                                              \
+    /* (tmp11 - tmp2) has been calculated (out_row6 before descale) */        \
+    tmp11_minus_tmp2 = q1;                                                    \
+                                                                              \
+    q1 = ((INT32) row0 + (INT32) row4) << 13;                                 \
+    q2 = q1 + q6;                                                             \
+    q1 = q1 - q6;                                                             \
+                                                                              \
+    /* pick up the results */                                                 \
+    tmp0  = q4;                                                               \
+    tmp1  = q5;                                                               \
+    tmp2  = (tmp11_plus_tmp2 - tmp11_minus_tmp2) / 2;                         \
+    tmp3  = q7;                                                               \
+    tmp10 = q2;                                                               \
+    tmp11 = (tmp11_plus_tmp2 + tmp11_minus_tmp2) / 2;                         \
+    tmp12 = q3;                                                               \
+    tmp13 = q1;                                                               \
+}
+
+#define XFIX_0_899976223                    d0[0]
+#define XFIX_0_541196100                    d0[1]
+#define XFIX_2_562915447                    d0[2]
+#define XFIX_0_298631336_MINUS_0_899976223  d0[3]
+#define XFIX_1_501321110_MINUS_0_899976223  d1[0]
+#define XFIX_2_053119869_MINUS_2_562915447  d1[1]
+#define XFIX_0_541196100_PLUS_0_765366865   d1[2]
+#define XFIX_1_175875602                    d1[3]
+#define XFIX_1_175875602_MINUS_0_390180644  d2[0]
+#define XFIX_0_541196100_MINUS_1_847759065  d2[1]
+#define XFIX_3_072711026_MINUS_2_562915447  d2[2]
+#define XFIX_1_175875602_MINUS_1_961570560  d2[3]
+
+.balign 16
+jsimd_idct_islow_neon_consts:
+    .short FIX_0_899976223                    /* d0[0] */
+    .short FIX_0_541196100                    /* d0[1] */
+    .short FIX_2_562915447                    /* d0[2] */
+    .short FIX_0_298631336_MINUS_0_899976223  /* d0[3] */
+    .short FIX_1_501321110_MINUS_0_899976223  /* d1[0] */
+    .short FIX_2_053119869_MINUS_2_562915447  /* d1[1] */
+    .short FIX_0_541196100_PLUS_0_765366865   /* d1[2] */
+    .short FIX_1_175875602                    /* d1[3] */
+    /* reloadable constants */
+    .short FIX_1_175875602_MINUS_0_390180644  /* d2[0] */
+    .short FIX_0_541196100_MINUS_1_847759065  /* d2[1] */
+    .short FIX_3_072711026_MINUS_2_562915447  /* d2[2] */
+    .short FIX_1_175875602_MINUS_1_961570560  /* d2[3] */
+
+asm_function jsimd_idct_islow_neon
+
+    DCT_TABLE       .req r0
+    COEF_BLOCK      .req r1
+    OUTPUT_BUF      .req r2
+    OUTPUT_COL      .req r3
+    TMP1            .req r0
+    TMP2            .req r1
+    TMP3            .req r2
+    TMP4            .req ip
+
+    ROW0L           .req d16
+    ROW0R           .req d17
+    ROW1L           .req d18
+    ROW1R           .req d19
+    ROW2L           .req d20
+    ROW2R           .req d21
+    ROW3L           .req d22
+    ROW3R           .req d23
+    ROW4L           .req d24
+    ROW4R           .req d25
+    ROW5L           .req d26
+    ROW5R           .req d27
+    ROW6L           .req d28
+    ROW6R           .req d29
+    ROW7L           .req d30
+    ROW7R           .req d31
+
+    /* Load and dequantize coefficients into NEON registers
+     * with the following allocation:
+     *       0 1 2 3 | 4 5 6 7
+     *      ---------+--------
+     *   0 | d16     | d17     ( q8  )
+     *   1 | d18     | d19     ( q9  )
+     *   2 | d20     | d21     ( q10 )
+     *   3 | d22     | d23     ( q11 )
+     *   4 | d24     | d25     ( q12 )
+     *   5 | d26     | d27     ( q13 )
+     *   6 | d28     | d29     ( q14 )
+     *   7 | d30     | d31     ( q15 )
+     */
+    adr             ip, jsimd_idct_islow_neon_consts
+    vld1.16         {d16, d17, d18, d19}, [COEF_BLOCK, :128]!
+    vld1.16         {d0, d1, d2, d3}, [DCT_TABLE, :128]!
+    vld1.16         {d20, d21, d22, d23}, [COEF_BLOCK, :128]!
+    vmul.s16        q8, q8, q0
+    vld1.16         {d4, d5, d6, d7}, [DCT_TABLE, :128]!
+    vmul.s16        q9, q9, q1
+    vld1.16         {d24, d25, d26, d27}, [COEF_BLOCK, :128]!
+    vmul.s16        q10, q10, q2
+    vld1.16         {d0, d1, d2, d3}, [DCT_TABLE, :128]!
+    vmul.s16        q11, q11, q3
+    vld1.16         {d28, d29, d30, d31}, [COEF_BLOCK, :128]
+    vmul.s16        q12, q12, q0
+    vld1.16         {d4, d5, d6, d7}, [DCT_TABLE, :128]!
+    vmul.s16        q14, q14, q2
+    vmul.s16        q13, q13, q1
+    vld1.16         {d0, d1, d2, d3}, [ip, :128] /* load constants */
+    add             ip, ip, #16
+    vmul.s16        q15, q15, q3
+    vpush           {d8-d15} /* save NEON registers */
+    /* 1-D IDCT, pass 1, left 4x8 half */
+    vadd.s16        d4,    ROW7L, ROW3L
+    vadd.s16        d5,    ROW5L, ROW1L
+    vmull.s16       q6,    d4,    XFIX_1_175875602_MINUS_1_961570560
+    vmlal.s16       q6,    d5,    XFIX_1_175875602
+    vmull.s16       q7,    d4,    XFIX_1_175875602
+      /* Check for the zero coefficients in the right 4x8 half */
+      push            {r4, r5}
+    vmlal.s16       q7,    d5,    XFIX_1_175875602_MINUS_0_390180644
+    vsubl.s16       q3,    ROW0L, ROW4L
+      ldrd            r4,    [COEF_BLOCK, #(-96 + 2 * (4 + 1 * 8))]
+    vmull.s16       q2,    ROW2L, XFIX_0_541196100
+    vmlal.s16       q2,    ROW6L, XFIX_0_541196100_MINUS_1_847759065
+      orr             r0,    r4,    r5
+    vmov            q4,    q6
+    vmlsl.s16       q6,    ROW5L, XFIX_2_562915447
+      ldrd            r4,    [COEF_BLOCK, #(-96 + 2 * (4 + 2 * 8))]
+    vmlal.s16       q6,    ROW3L, XFIX_3_072711026_MINUS_2_562915447
+    vshl.s32        q3,    q3,    #13
+      orr             r0,    r0,    r4
+    vmlsl.s16       q4,    ROW1L, XFIX_0_899976223
+      orr             r0,    r0,    r5
+    vadd.s32        q1,    q3,    q2
+      ldrd            r4,    [COEF_BLOCK, #(-96 + 2 * (4 + 3 * 8))]
+    vmov            q5,    q7
+    vadd.s32        q1,    q1,    q6
+      orr             r0,    r0,    r4
+    vmlsl.s16       q7,    ROW7L, XFIX_0_899976223
+      orr             r0,    r0,    r5
+    vmlal.s16       q7,    ROW1L, XFIX_1_501321110_MINUS_0_899976223
+    vrshrn.s32      ROW1L, q1,    #11
+      ldrd            r4,    [COEF_BLOCK, #(-96 + 2 * (4 + 4 * 8))]
+    vsub.s32        q1,    q1,    q6
+    vmlal.s16       q5,    ROW5L, XFIX_2_053119869_MINUS_2_562915447
+      orr             r0,    r0,    r4
+    vmlsl.s16       q5,    ROW3L, XFIX_2_562915447
+      orr             r0,    r0,    r5
+    vsub.s32        q1,    q1,    q6
+    vmull.s16       q6,    ROW2L, XFIX_0_541196100_PLUS_0_765366865
+      ldrd            r4,    [COEF_BLOCK, #(-96 + 2 * (4 + 5 * 8))]
+    vmlal.s16       q6,    ROW6L, XFIX_0_541196100
+    vsub.s32        q3,    q3,    q2
+      orr             r0,    r0,    r4
+    vrshrn.s32      ROW6L, q1,    #11
+      orr             r0,    r0,    r5
+    vadd.s32        q1,    q3,    q5
+      ldrd            r4,    [COEF_BLOCK, #(-96 + 2 * (4 + 6 * 8))]
+    vsub.s32        q3,    q3,    q5
+    vaddl.s16       q5,    ROW0L, ROW4L
+      orr             r0,    r0,    r4
+    vrshrn.s32      ROW2L, q1,    #11
+      orr             r0,    r0,    r5
+    vrshrn.s32      ROW5L, q3,    #11
+      ldrd            r4,    [COEF_BLOCK, #(-96 + 2 * (4 + 7 * 8))]
+    vshl.s32        q5,    q5,    #13
+    vmlal.s16       q4,    ROW7L, XFIX_0_298631336_MINUS_0_899976223
+      orr             r0,    r0,    r4
+    vadd.s32        q2,    q5,    q6
+      orrs            r0,    r0,    r5
+    vsub.s32        q1,    q5,    q6
+    vadd.s32        q6,    q2,    q7
+      ldrd            r4,    [COEF_BLOCK, #(-96 + 2 * (4 + 0 * 8))]
+    vsub.s32        q2,    q2,    q7
+    vadd.s32        q5,    q1,    q4
+      orr             r0,    r4,    r5
+    vsub.s32        q3,    q1,    q4
+      pop             {r4, r5}
+    vrshrn.s32      ROW7L, q2,    #11
+    vrshrn.s32      ROW3L, q5,    #11
+    vrshrn.s32      ROW0L, q6,    #11
+    vrshrn.s32      ROW4L, q3,    #11
+
+      beq             3f /* Go to do some special handling for the sparse right 4x8 half */
+
+    /* 1-D IDCT, pass 1, right 4x8 half */
+    vld1.s16        {d2},  [ip, :64]    /* reload constants */
+    vadd.s16        d10,   ROW7R, ROW3R
+    vadd.s16        d8,    ROW5R, ROW1R
+      /* Transpose left 4x8 half */
+      vtrn.16         ROW6L, ROW7L
+    vmull.s16       q6,    d10,   XFIX_1_175875602_MINUS_1_961570560
+    vmlal.s16       q6,    d8,    XFIX_1_175875602
+      vtrn.16         ROW2L, ROW3L
+    vmull.s16       q7,    d10,   XFIX_1_175875602
+    vmlal.s16       q7,    d8,    XFIX_1_175875602_MINUS_0_390180644
+      vtrn.16         ROW0L, ROW1L
+    vsubl.s16       q3,    ROW0R, ROW4R
+    vmull.s16       q2,    ROW2R, XFIX_0_541196100
+    vmlal.s16       q2,    ROW6R, XFIX_0_541196100_MINUS_1_847759065
+      vtrn.16         ROW4L, ROW5L
+    vmov            q4,    q6
+    vmlsl.s16       q6,    ROW5R, XFIX_2_562915447
+    vmlal.s16       q6,    ROW3R, XFIX_3_072711026_MINUS_2_562915447
+      vtrn.32         ROW1L, ROW3L
+    vshl.s32        q3,    q3,    #13
+    vmlsl.s16       q4,    ROW1R, XFIX_0_899976223
+      vtrn.32         ROW4L, ROW6L
+    vadd.s32        q1,    q3,    q2
+    vmov            q5,    q7
+    vadd.s32        q1,    q1,    q6
+      vtrn.32         ROW0L, ROW2L
+    vmlsl.s16       q7,    ROW7R, XFIX_0_899976223
+    vmlal.s16       q7,    ROW1R, XFIX_1_501321110_MINUS_0_899976223
+    vrshrn.s32      ROW1R, q1,    #11
+      vtrn.32         ROW5L, ROW7L
+    vsub.s32        q1,    q1,    q6
+    vmlal.s16       q5,    ROW5R, XFIX_2_053119869_MINUS_2_562915447
+    vmlsl.s16       q5,    ROW3R, XFIX_2_562915447
+    vsub.s32        q1,    q1,    q6
+    vmull.s16       q6,    ROW2R, XFIX_0_541196100_PLUS_0_765366865
+    vmlal.s16       q6,    ROW6R, XFIX_0_541196100
+    vsub.s32        q3,    q3,    q2
+    vrshrn.s32      ROW6R, q1,    #11
+    vadd.s32        q1,    q3,    q5
+    vsub.s32        q3,    q3,    q5
+    vaddl.s16       q5,    ROW0R, ROW4R
+    vrshrn.s32      ROW2R, q1,    #11
+    vrshrn.s32      ROW5R, q3,    #11
+    vshl.s32        q5,    q5,    #13
+    vmlal.s16       q4,    ROW7R, XFIX_0_298631336_MINUS_0_899976223
+    vadd.s32        q2,    q5,    q6
+    vsub.s32        q1,    q5,    q6
+    vadd.s32        q6,    q2,    q7
+    vsub.s32        q2,    q2,    q7
+    vadd.s32        q5,    q1,    q4
+    vsub.s32        q3,    q1,    q4
+    vrshrn.s32      ROW7R, q2,    #11
+    vrshrn.s32      ROW3R, q5,    #11
+    vrshrn.s32      ROW0R, q6,    #11
+    vrshrn.s32      ROW4R, q3,    #11
+    /* Transpose right 4x8 half */
+    vtrn.16         ROW6R, ROW7R
+    vtrn.16         ROW2R, ROW3R
+    vtrn.16         ROW0R, ROW1R
+    vtrn.16         ROW4R, ROW5R
+    vtrn.32         ROW1R, ROW3R
+    vtrn.32         ROW4R, ROW6R
+    vtrn.32         ROW0R, ROW2R
+    vtrn.32         ROW5R, ROW7R
+
+1:  /* 1-D IDCT, pass 2 (normal variant), left 4x8 half */
+    vld1.s16        {d2},  [ip, :64]    /* reload constants */
+    vmull.s16       q6,    ROW1R, XFIX_1_175875602 /* ROW5L <-> ROW1R */
+    vmlal.s16       q6,    ROW1L, XFIX_1_175875602
+    vmlal.s16       q6,    ROW3R, XFIX_1_175875602_MINUS_1_961570560 /* ROW7L <-> ROW3R */
+    vmlal.s16       q6,    ROW3L, XFIX_1_175875602_MINUS_1_961570560
+    vmull.s16       q7,    ROW3R, XFIX_1_175875602 /* ROW7L <-> ROW3R */
+    vmlal.s16       q7,    ROW3L, XFIX_1_175875602
+    vmlal.s16       q7,    ROW1R, XFIX_1_175875602_MINUS_0_390180644 /* ROW5L <-> ROW1R */
+    vmlal.s16       q7,    ROW1L, XFIX_1_175875602_MINUS_0_390180644
+    vsubl.s16       q3,    ROW0L, ROW0R /* ROW4L <-> ROW0R */
+    vmull.s16       q2,    ROW2L, XFIX_0_541196100
+    vmlal.s16       q2,    ROW2R, XFIX_0_541196100_MINUS_1_847759065 /* ROW6L <-> ROW2R */
+    vmov            q4,    q6
+    vmlsl.s16       q6,    ROW1R, XFIX_2_562915447 /* ROW5L <-> ROW1R */
+    vmlal.s16       q6,    ROW3L, XFIX_3_072711026_MINUS_2_562915447
+    vshl.s32        q3,    q3,    #13
+    vmlsl.s16       q4,    ROW1L, XFIX_0_899976223
+    vadd.s32        q1,    q3,    q2
+    vmov            q5,    q7
+    vadd.s32        q1,    q1,    q6
+    vmlsl.s16       q7,    ROW3R, XFIX_0_899976223 /* ROW7L <-> ROW3R */
+    vmlal.s16       q7,    ROW1L, XFIX_1_501321110_MINUS_0_899976223
+    vshrn.s32       ROW1L, q1,    #16
+    vsub.s32        q1,    q1,    q6
+    vmlal.s16       q5,    ROW1R, XFIX_2_053119869_MINUS_2_562915447 /* ROW5L <-> ROW1R */
+    vmlsl.s16       q5,    ROW3L, XFIX_2_562915447
+    vsub.s32        q1,    q1,    q6
+    vmull.s16       q6,    ROW2L, XFIX_0_541196100_PLUS_0_765366865
+    vmlal.s16       q6,    ROW2R, XFIX_0_541196100 /* ROW6L <-> ROW2R */
+    vsub.s32        q3,    q3,    q2
+    vshrn.s32       ROW2R, q1,    #16 /* ROW6L <-> ROW2R */
+    vadd.s32        q1,    q3,    q5
+    vsub.s32        q3,    q3,    q5
+    vaddl.s16       q5,    ROW0L, ROW0R /* ROW4L <-> ROW0R */
+    vshrn.s32       ROW2L, q1,    #16
+    vshrn.s32       ROW1R, q3,    #16 /* ROW5L <-> ROW1R */
+    vshl.s32        q5,    q5,    #13
+    vmlal.s16       q4,    ROW3R, XFIX_0_298631336_MINUS_0_899976223 /* ROW7L <-> ROW3R */
+    vadd.s32        q2,    q5,    q6
+    vsub.s32        q1,    q5,    q6
+    vadd.s32        q6,    q2,    q7
+    vsub.s32        q2,    q2,    q7
+    vadd.s32        q5,    q1,    q4
+    vsub.s32        q3,    q1,    q4
+    vshrn.s32       ROW3R, q2,    #16 /* ROW7L <-> ROW3R */
+    vshrn.s32       ROW3L, q5,    #16
+    vshrn.s32       ROW0L, q6,    #16
+    vshrn.s32       ROW0R, q3,    #16 /* ROW4L <-> ROW0R */
+    /* 1-D IDCT, pass 2, right 4x8 half */
+    vld1.s16        {d2},  [ip, :64]    /* reload constants */
+    vmull.s16       q6,    ROW5R, XFIX_1_175875602
+    vmlal.s16       q6,    ROW5L, XFIX_1_175875602 /* ROW5L <-> ROW1R */
+    vmlal.s16       q6,    ROW7R, XFIX_1_175875602_MINUS_1_961570560
+    vmlal.s16       q6,    ROW7L, XFIX_1_175875602_MINUS_1_961570560 /* ROW7L <-> ROW3R */
+    vmull.s16       q7,    ROW7R, XFIX_1_175875602
+    vmlal.s16       q7,    ROW7L, XFIX_1_175875602 /* ROW7L <-> ROW3R */
+    vmlal.s16       q7,    ROW5R, XFIX_1_175875602_MINUS_0_390180644
+    vmlal.s16       q7,    ROW5L, XFIX_1_175875602_MINUS_0_390180644 /* ROW5L <-> ROW1R */
+    vsubl.s16       q3,    ROW4L, ROW4R /* ROW4L <-> ROW0R */
+    vmull.s16       q2,    ROW6L, XFIX_0_541196100 /* ROW6L <-> ROW2R */
+    vmlal.s16       q2,    ROW6R, XFIX_0_541196100_MINUS_1_847759065
+    vmov            q4,    q6
+    vmlsl.s16       q6,    ROW5R, XFIX_2_562915447
+    vmlal.s16       q6,    ROW7L, XFIX_3_072711026_MINUS_2_562915447 /* ROW7L <-> ROW3R */
+    vshl.s32        q3,    q3,    #13
+    vmlsl.s16       q4,    ROW5L, XFIX_0_899976223 /* ROW5L <-> ROW1R */
+    vadd.s32        q1,    q3,    q2
+    vmov            q5,    q7
+    vadd.s32        q1,    q1,    q6
+    vmlsl.s16       q7,    ROW7R, XFIX_0_899976223
+    vmlal.s16       q7,    ROW5L, XFIX_1_501321110_MINUS_0_899976223 /* ROW5L <-> ROW1R */
+    vshrn.s32       ROW5L, q1,    #16 /* ROW5L <-> ROW1R */
+    vsub.s32        q1,    q1,    q6
+    vmlal.s16       q5,    ROW5R, XFIX_2_053119869_MINUS_2_562915447
+    vmlsl.s16       q5,    ROW7L, XFIX_2_562915447 /* ROW7L <-> ROW3R */
+    vsub.s32        q1,    q1,    q6
+    vmull.s16       q6,    ROW6L, XFIX_0_541196100_PLUS_0_765366865 /* ROW6L <-> ROW2R */
+    vmlal.s16       q6,    ROW6R, XFIX_0_541196100
+    vsub.s32        q3,    q3,    q2
+    vshrn.s32       ROW6R, q1,    #16
+    vadd.s32        q1,    q3,    q5
+    vsub.s32        q3,    q3,    q5
+    vaddl.s16       q5,    ROW4L, ROW4R /* ROW4L <-> ROW0R */
+    vshrn.s32       ROW6L, q1,    #16 /* ROW6L <-> ROW2R */
+    vshrn.s32       ROW5R, q3,    #16
+    vshl.s32        q5,    q5,    #13
+    vmlal.s16       q4,    ROW7R, XFIX_0_298631336_MINUS_0_899976223
+    vadd.s32        q2,    q5,    q6
+    vsub.s32        q1,    q5,    q6
+    vadd.s32        q6,    q2,    q7
+    vsub.s32        q2,    q2,    q7
+    vadd.s32        q5,    q1,    q4
+    vsub.s32        q3,    q1,    q4
+    vshrn.s32       ROW7R, q2,    #16
+    vshrn.s32       ROW7L, q5,    #16 /* ROW7L <-> ROW3R */
+    vshrn.s32       ROW4L, q6,    #16 /* ROW4L <-> ROW0R */
+    vshrn.s32       ROW4R, q3,    #16
+
+2:  /* Descale to 8-bit and range limit */
+    vqrshrn.s16     d16,   q8,    #2
+    vqrshrn.s16     d17,   q9,    #2
+    vqrshrn.s16     d18,   q10,   #2
+    vqrshrn.s16     d19,   q11,   #2
+    vpop            {d8-d15} /* restore NEON registers */
+    vqrshrn.s16     d20,   q12,   #2
+      /* Transpose the final 8-bit samples and do signed->unsigned conversion */
+      vtrn.16         q8,    q9
+    vqrshrn.s16     d21,   q13,   #2
+    vqrshrn.s16     d22,   q14,   #2
+      vmov.u8         q0,    #(CENTERJSAMPLE)
+    vqrshrn.s16     d23,   q15,   #2
+      vtrn.8          d16,   d17
+      vtrn.8          d18,   d19
+      vadd.u8         q8,    q8,    q0
+      vadd.u8         q9,    q9,    q0
+      vtrn.16         q10,   q11
+        /* Store results to the output buffer */
+        ldmia           OUTPUT_BUF!, {TMP1, TMP2}
+        add             TMP1, TMP1, OUTPUT_COL
+        add             TMP2, TMP2, OUTPUT_COL
+        vst1.8          {d16}, [TMP1]
+      vtrn.8          d20, d21
+        vst1.8          {d17}, [TMP2]
+        ldmia           OUTPUT_BUF!, {TMP1, TMP2}
+        add             TMP1, TMP1, OUTPUT_COL
+        add             TMP2, TMP2, OUTPUT_COL
+        vst1.8          {d18}, [TMP1]
+      vadd.u8         q10,   q10,   q0
+        vst1.8          {d19}, [TMP2]
+        ldmia           OUTPUT_BUF, {TMP1, TMP2, TMP3, TMP4}
+        add             TMP1, TMP1, OUTPUT_COL
+        add             TMP2, TMP2, OUTPUT_COL
+        add             TMP3, TMP3, OUTPUT_COL
+        add             TMP4, TMP4, OUTPUT_COL
+      vtrn.8          d22, d23
+        vst1.8          {d20}, [TMP1]
+      vadd.u8         q11,   q11,   q0
+        vst1.8          {d21}, [TMP2]
+        vst1.8          {d22}, [TMP3]
+        vst1.8          {d23}, [TMP4]
+    bx              lr
+
+3:  /* Left 4x8 half is done, right 4x8 half contains mostly zeros */
+
+    /* Transpose left 4x8 half */
+    vtrn.16         ROW6L, ROW7L
+    vtrn.16         ROW2L, ROW3L
+    vtrn.16         ROW0L, ROW1L
+    vtrn.16         ROW4L, ROW5L
+    vshl.s16        ROW0R, ROW0R, #2 /* PASS1_BITS */
+    vtrn.32         ROW1L, ROW3L
+    vtrn.32         ROW4L, ROW6L
+    vtrn.32         ROW0L, ROW2L
+    vtrn.32         ROW5L, ROW7L
+
+    cmp             r0, #0
+    beq             4f /* Right 4x8 half has all zeros, go to 'sparse' second pass */
+
+    /* Only row 0 is non-zero for the right 4x8 half  */
+    vdup.s16        ROW1R, ROW0R[1]
+    vdup.s16        ROW2R, ROW0R[2]
+    vdup.s16        ROW3R, ROW0R[3]
+    vdup.s16        ROW4R, ROW0R[0]
+    vdup.s16        ROW5R, ROW0R[1]
+    vdup.s16        ROW6R, ROW0R[2]
+    vdup.s16        ROW7R, ROW0R[3]
+    vdup.s16        ROW0R, ROW0R[0]
+    b               1b /* Go to 'normal' second pass */
+
+4:  /* 1-D IDCT, pass 2 (sparse variant with zero rows 4-7), left 4x8 half */
+    vld1.s16        {d2},  [ip, :64]    /* reload constants */
+    vmull.s16       q6,    ROW1L, XFIX_1_175875602
+    vmlal.s16       q6,    ROW3L, XFIX_1_175875602_MINUS_1_961570560
+    vmull.s16       q7,    ROW3L, XFIX_1_175875602
+    vmlal.s16       q7,    ROW1L, XFIX_1_175875602_MINUS_0_390180644
+    vmull.s16       q2,    ROW2L, XFIX_0_541196100
+    vshll.s16       q3,    ROW0L, #13
+    vmov            q4,    q6
+    vmlal.s16       q6,    ROW3L, XFIX_3_072711026_MINUS_2_562915447
+    vmlsl.s16       q4,    ROW1L, XFIX_0_899976223
+    vadd.s32        q1,    q3,    q2
+    vmov            q5,    q7
+    vmlal.s16       q7,    ROW1L, XFIX_1_501321110_MINUS_0_899976223
+    vadd.s32        q1,    q1,    q6
+    vadd.s32        q6,    q6,    q6
+    vmlsl.s16       q5,    ROW3L, XFIX_2_562915447
+    vshrn.s32       ROW1L, q1,    #16
+    vsub.s32        q1,    q1,    q6
+    vmull.s16       q6,    ROW2L, XFIX_0_541196100_PLUS_0_765366865
+    vsub.s32        q3,    q3,    q2
+    vshrn.s32       ROW2R, q1,    #16 /* ROW6L <-> ROW2R */
+    vadd.s32        q1,    q3,    q5
+    vsub.s32        q3,    q3,    q5
+    vshll.s16       q5,    ROW0L, #13
+    vshrn.s32       ROW2L, q1,    #16
+    vshrn.s32       ROW1R, q3,    #16 /* ROW5L <-> ROW1R */
+    vadd.s32        q2,    q5,    q6
+    vsub.s32        q1,    q5,    q6
+    vadd.s32        q6,    q2,    q7
+    vsub.s32        q2,    q2,    q7
+    vadd.s32        q5,    q1,    q4
+    vsub.s32        q3,    q1,    q4
+    vshrn.s32       ROW3R, q2,    #16 /* ROW7L <-> ROW3R */
+    vshrn.s32       ROW3L, q5,    #16
+    vshrn.s32       ROW0L, q6,    #16
+    vshrn.s32       ROW0R, q3,    #16 /* ROW4L <-> ROW0R */
+    /* 1-D IDCT, pass 2 (sparse variant with zero rows 4-7), right 4x8 half */
+    vld1.s16        {d2},  [ip, :64]    /* reload constants */
+    vmull.s16       q6,    ROW5L, XFIX_1_175875602
+    vmlal.s16       q6,    ROW7L, XFIX_1_175875602_MINUS_1_961570560
+    vmull.s16       q7,    ROW7L, XFIX_1_175875602
+    vmlal.s16       q7,    ROW5L, XFIX_1_175875602_MINUS_0_390180644
+    vmull.s16       q2,    ROW6L, XFIX_0_541196100
+    vshll.s16       q3,    ROW4L, #13
+    vmov            q4,    q6
+    vmlal.s16       q6,    ROW7L, XFIX_3_072711026_MINUS_2_562915447
+    vmlsl.s16       q4,    ROW5L, XFIX_0_899976223
+    vadd.s32        q1,    q3,    q2
+    vmov            q5,    q7
+    vmlal.s16       q7,    ROW5L, XFIX_1_501321110_MINUS_0_899976223
+    vadd.s32        q1,    q1,    q6
+    vadd.s32        q6,    q6,    q6
+    vmlsl.s16       q5,    ROW7L, XFIX_2_562915447
+    vshrn.s32       ROW5L, q1,    #16 /* ROW5L <-> ROW1R */
+    vsub.s32        q1,    q1,    q6
+    vmull.s16       q6,    ROW6L, XFIX_0_541196100_PLUS_0_765366865
+    vsub.s32        q3,    q3,    q2
+    vshrn.s32       ROW6R, q1,    #16
+    vadd.s32        q1,    q3,    q5
+    vsub.s32        q3,    q3,    q5
+    vshll.s16       q5,    ROW4L, #13
+    vshrn.s32       ROW6L, q1,    #16 /* ROW6L <-> ROW2R */
+    vshrn.s32       ROW5R, q3,    #16
+    vadd.s32        q2,    q5,    q6
+    vsub.s32        q1,    q5,    q6
+    vadd.s32        q6,    q2,    q7
+    vsub.s32        q2,    q2,    q7
+    vadd.s32        q5,    q1,    q4
+    vsub.s32        q3,    q1,    q4
+    vshrn.s32       ROW7R, q2,    #16
+    vshrn.s32       ROW7L, q5,    #16 /* ROW7L <-> ROW3R */
+    vshrn.s32       ROW4L, q6,    #16 /* ROW4L <-> ROW0R */
+    vshrn.s32       ROW4R, q3,    #16
+    b               2b /* Go to epilogue */
+
+    .unreq          DCT_TABLE
+    .unreq          COEF_BLOCK
+    .unreq          OUTPUT_BUF
+    .unreq          OUTPUT_COL
+    .unreq          TMP1
+    .unreq          TMP2
+    .unreq          TMP3
+    .unreq          TMP4
+
+    .unreq          ROW0L
+    .unreq          ROW0R
+    .unreq          ROW1L
+    .unreq          ROW1R
+    .unreq          ROW2L
+    .unreq          ROW2R
+    .unreq          ROW3L
+    .unreq          ROW3R
+    .unreq          ROW4L
+    .unreq          ROW4R
+    .unreq          ROW5L
+    .unreq          ROW5R
+    .unreq          ROW6L
+    .unreq          ROW6R
+    .unreq          ROW7L
+    .unreq          ROW7R
+.endfunc
+
+/*****************************************************************************/
+
+/*
+ * jsimd_idct_ifast_neon
+ *
+ * This function contains a fast, not so accurate integer implementation of
+ * the inverse DCT (Discrete Cosine Transform). It uses the same calculations
+ * and produces exactly the same output as IJG's original 'jpeg_idct_ifast'
+ * function from jidctfst.c
+ *
+ * Normally 1-D AAN DCT needs 5 multiplications and 29 additions.
+ * But in ARM NEON case some extra additions are required because VQDMULH
+ * instruction can't handle the constants larger than 1. So the expressions
+ * like "x * 1.082392200" have to be converted to "x * 0.082392200 + x",
+ * which introduces an extra addition. Overall, there are 6 extra additions
+ * per 1-D IDCT pass, totalling to 5 VQDMULH and 35 VADD/VSUB instructions.
+ */
+
+#define XFIX_1_082392200 d0[0]
+#define XFIX_1_414213562 d0[1]
+#define XFIX_1_847759065 d0[2]
+#define XFIX_2_613125930 d0[3]
+
+.balign 16
+jsimd_idct_ifast_neon_consts:
+    .short (277 * 128 - 256 * 128) /* XFIX_1_082392200 */
+    .short (362 * 128 - 256 * 128) /* XFIX_1_414213562 */
+    .short (473 * 128 - 256 * 128) /* XFIX_1_847759065 */
+    .short (669 * 128 - 512 * 128) /* XFIX_2_613125930 */
+
+asm_function jsimd_idct_ifast_neon
+
+    DCT_TABLE       .req r0
+    COEF_BLOCK      .req r1
+    OUTPUT_BUF      .req r2
+    OUTPUT_COL      .req r3
+    TMP1            .req r0
+    TMP2            .req r1
+    TMP3            .req r2
+    TMP4            .req ip
+
+    /* Load and dequantize coefficients into NEON registers
+     * with the following allocation:
+     *       0 1 2 3 | 4 5 6 7
+     *      ---------+--------
+     *   0 | d16     | d17     ( q8  )
+     *   1 | d18     | d19     ( q9  )
+     *   2 | d20     | d21     ( q10 )
+     *   3 | d22     | d23     ( q11 )
+     *   4 | d24     | d25     ( q12 )
+     *   5 | d26     | d27     ( q13 )
+     *   6 | d28     | d29     ( q14 )
+     *   7 | d30     | d31     ( q15 )
+     */
+    adr             ip, jsimd_idct_ifast_neon_consts
+    vld1.16         {d16, d17, d18, d19}, [COEF_BLOCK, :128]!
+    vld1.16         {d0, d1, d2, d3}, [DCT_TABLE, :128]!
+    vld1.16         {d20, d21, d22, d23}, [COEF_BLOCK, :128]!
+    vmul.s16        q8,  q8,  q0
+    vld1.16         {d4, d5, d6, d7}, [DCT_TABLE, :128]!
+    vmul.s16        q9,  q9,  q1
+    vld1.16         {d24, d25, d26, d27}, [COEF_BLOCK, :128]!
+    vmul.s16        q10, q10, q2
+    vld1.16         {d0, d1, d2, d3}, [DCT_TABLE, :128]!
+    vmul.s16        q11, q11, q3
+    vld1.16         {d28, d29, d30, d31}, [COEF_BLOCK, :128]
+    vmul.s16        q12, q12, q0
+    vld1.16         {d4, d5, d6, d7}, [DCT_TABLE, :128]!
+    vmul.s16        q14, q14, q2
+    vmul.s16        q13, q13, q1
+    vld1.16         {d0}, [ip, :64] /* load constants */
+    vmul.s16        q15, q15, q3
+    vpush           {d8-d13}        /* save NEON registers */
+    /* 1-D IDCT, pass 1 */
+    vsub.s16        q2,  q10, q14
+    vadd.s16        q14, q10, q14
+    vsub.s16        q1,  q11, q13
+    vadd.s16        q13, q11, q13
+    vsub.s16        q5,  q9,  q15
+    vadd.s16        q15, q9,  q15
+    vqdmulh.s16     q4,  q2,  XFIX_1_414213562
+    vqdmulh.s16     q6,  q1,  XFIX_2_613125930
+    vadd.s16        q3,  q1,  q1
+    vsub.s16        q1,  q5,  q1
+    vadd.s16        q10, q2,  q4
+    vqdmulh.s16     q4,  q1,  XFIX_1_847759065
+    vsub.s16        q2,  q15, q13
+    vadd.s16        q3,  q3,  q6
+    vqdmulh.s16     q6,  q2,  XFIX_1_414213562
+    vadd.s16        q1,  q1,  q4
+    vqdmulh.s16     q4,  q5,  XFIX_1_082392200
+    vsub.s16        q10, q10, q14
+    vadd.s16        q2,  q2,  q6
+    vsub.s16        q6,  q8,  q12
+    vadd.s16        q12, q8,  q12
+    vadd.s16        q9,  q5,  q4
+    vadd.s16        q5,  q6,  q10
+    vsub.s16        q10, q6,  q10
+    vadd.s16        q6,  q15, q13
+    vadd.s16        q8,  q12, q14
+    vsub.s16        q3,  q6,  q3
+    vsub.s16        q12, q12, q14
+    vsub.s16        q3,  q3,  q1
+    vsub.s16        q1,  q9,  q1
+    vadd.s16        q2,  q3,  q2
+    vsub.s16        q15, q8,  q6
+    vadd.s16        q1,  q1,  q2
+    vadd.s16        q8,  q8,  q6
+    vadd.s16        q14, q5,  q3
+    vsub.s16        q9,  q5,  q3
+    vsub.s16        q13, q10, q2
+    vadd.s16        q10, q10, q2
+      /* Transpose */
+      vtrn.16         q8,  q9
+    vsub.s16        q11, q12, q1
+      vtrn.16         q14, q15
+    vadd.s16        q12, q12, q1
+      vtrn.16         q10, q11
+      vtrn.16         q12, q13
+      vtrn.32         q9,  q11
+      vtrn.32         q12, q14
+      vtrn.32         q8,  q10
+      vtrn.32         q13, q15
+      vswp            d28, d21
+      vswp            d26, d19
+    /* 1-D IDCT, pass 2 */
+    vsub.s16        q2,  q10, q14
+      vswp            d30, d23
+    vadd.s16        q14, q10, q14
+      vswp            d24, d17
+    vsub.s16        q1,  q11, q13
+    vadd.s16        q13, q11, q13
+    vsub.s16        q5,  q9,  q15
+    vadd.s16        q15, q9,  q15
+    vqdmulh.s16     q4,  q2,  XFIX_1_414213562
+    vqdmulh.s16     q6,  q1,  XFIX_2_613125930
+    vadd.s16        q3,  q1,  q1
+    vsub.s16        q1,  q5,  q1
+    vadd.s16        q10, q2,  q4
+    vqdmulh.s16     q4,  q1,  XFIX_1_847759065
+    vsub.s16        q2,  q15, q13
+    vadd.s16        q3,  q3,  q6
+    vqdmulh.s16     q6,  q2,  XFIX_1_414213562
+    vadd.s16        q1,  q1,  q4
+    vqdmulh.s16     q4,  q5,  XFIX_1_082392200
+    vsub.s16        q10, q10, q14
+    vadd.s16        q2,  q2,  q6
+    vsub.s16        q6,  q8,  q12
+    vadd.s16        q12, q8,  q12
+    vadd.s16        q9,  q5,  q4
+    vadd.s16        q5,  q6,  q10
+    vsub.s16        q10, q6,  q10
+    vadd.s16        q6,  q15, q13
+    vadd.s16        q8,  q12, q14
+    vsub.s16        q3,  q6,  q3
+    vsub.s16        q12, q12, q14
+    vsub.s16        q3,  q3,  q1
+    vsub.s16        q1,  q9,  q1
+    vadd.s16        q2,  q3,  q2
+    vsub.s16        q15, q8,  q6
+    vadd.s16        q1,  q1,  q2
+    vadd.s16        q8,  q8,  q6
+    vadd.s16        q14, q5,  q3
+    vsub.s16        q9,  q5,  q3
+    vsub.s16        q13, q10, q2
+    vpop            {d8-d13}        /* restore NEON registers */
+    vadd.s16        q10, q10, q2
+    vsub.s16        q11, q12, q1
+    vadd.s16        q12, q12, q1
+    /* Descale to 8-bit and range limit */
+    vmov.u8         q0,  #0x80
+    vqshrn.s16      d16, q8,  #5
+    vqshrn.s16      d17, q9,  #5
+    vqshrn.s16      d18, q10, #5
+    vqshrn.s16      d19, q11, #5
+    vqshrn.s16      d20, q12, #5
+    vqshrn.s16      d21, q13, #5
+    vqshrn.s16      d22, q14, #5
+    vqshrn.s16      d23, q15, #5
+    vadd.u8         q8,  q8,  q0
+    vadd.u8         q9,  q9,  q0
+    vadd.u8         q10, q10, q0
+    vadd.u8         q11, q11, q0
+    /* Transpose the final 8-bit samples */
+    vtrn.16         q8,  q9
+    vtrn.16         q10, q11
+    vtrn.32         q8,  q10
+    vtrn.32         q9,  q11
+    vtrn.8          d16, d17
+    vtrn.8          d18, d19
+      /* Store results to the output buffer */
+      ldmia           OUTPUT_BUF!, {TMP1, TMP2}
+      add             TMP1, TMP1, OUTPUT_COL
+      add             TMP2, TMP2, OUTPUT_COL
+      vst1.8          {d16}, [TMP1]
+      vst1.8          {d17}, [TMP2]
+      ldmia           OUTPUT_BUF!, {TMP1, TMP2}
+      add             TMP1, TMP1, OUTPUT_COL
+      add             TMP2, TMP2, OUTPUT_COL
+      vst1.8          {d18}, [TMP1]
+    vtrn.8          d20, d21
+      vst1.8          {d19}, [TMP2]
+      ldmia           OUTPUT_BUF, {TMP1, TMP2, TMP3, TMP4}
+      add             TMP1, TMP1, OUTPUT_COL
+      add             TMP2, TMP2, OUTPUT_COL
+      add             TMP3, TMP3, OUTPUT_COL
+      add             TMP4, TMP4, OUTPUT_COL
+      vst1.8          {d20}, [TMP1]
+    vtrn.8          d22, d23
+      vst1.8          {d21}, [TMP2]
+      vst1.8          {d22}, [TMP3]
+      vst1.8          {d23}, [TMP4]
+    bx              lr
+
+    .unreq          DCT_TABLE
+    .unreq          COEF_BLOCK
+    .unreq          OUTPUT_BUF
+    .unreq          OUTPUT_COL
+    .unreq          TMP1
+    .unreq          TMP2
+    .unreq          TMP3
+    .unreq          TMP4
+.endfunc
+
+/*****************************************************************************/
+
+/*
+ * jsimd_idct_4x4_neon
+ *
+ * This function contains inverse-DCT code for getting reduced-size
+ * 4x4 pixels output from an 8x8 DCT block. It uses the same  calculations
+ * and produces exactly the same output as IJG's original 'jpeg_idct_4x4'
+ * function from jpeg-6b (jidctred.c).
+ *
+ * NOTE: jpeg-8 has an improved implementation of 4x4 inverse-DCT, which
+ *       requires much less arithmetic operations and hence should be faster.
+ *       The primary purpose of this particular NEON optimized function is
+ *       bit exact compatibility with jpeg-6b.
+ *
+ * TODO: a bit better instructions scheduling can be achieved by expanding
+ *       idct_helper/transpose_4x4 macros and reordering instructions,
+ *       but readability will suffer somewhat.
+ */
+
+#define CONST_BITS  13
+
+#define FIX_0_211164243  (1730)  /* FIX(0.211164243) */
+#define FIX_0_509795579  (4176)  /* FIX(0.509795579) */
+#define FIX_0_601344887  (4926)  /* FIX(0.601344887) */
+#define FIX_0_720959822  (5906)  /* FIX(0.720959822) */
+#define FIX_0_765366865  (6270)  /* FIX(0.765366865) */
+#define FIX_0_850430095  (6967)  /* FIX(0.850430095) */
+#define FIX_0_899976223  (7373)  /* FIX(0.899976223) */
+#define FIX_1_061594337  (8697)  /* FIX(1.061594337) */
+#define FIX_1_272758580  (10426) /* FIX(1.272758580) */
+#define FIX_1_451774981  (11893) /* FIX(1.451774981) */
+#define FIX_1_847759065  (15137) /* FIX(1.847759065) */
+#define FIX_2_172734803  (17799) /* FIX(2.172734803) */
+#define FIX_2_562915447  (20995) /* FIX(2.562915447) */
+#define FIX_3_624509785  (29692) /* FIX(3.624509785) */
+
+.balign 16
+jsimd_idct_4x4_neon_consts:
+    .short     FIX_1_847759065     /* d0[0] */
+    .short     -FIX_0_765366865    /* d0[1] */
+    .short     -FIX_0_211164243    /* d0[2] */
+    .short     FIX_1_451774981     /* d0[3] */
+    .short     -FIX_2_172734803    /* d1[0] */
+    .short     FIX_1_061594337     /* d1[1] */
+    .short     -FIX_0_509795579    /* d1[2] */
+    .short     -FIX_0_601344887    /* d1[3] */
+    .short     FIX_0_899976223     /* d2[0] */
+    .short     FIX_2_562915447     /* d2[1] */
+    .short     1 << (CONST_BITS+1) /* d2[2] */
+    .short     0                   /* d2[3] */
+
+.macro idct_helper x4, x6, x8, x10, x12, x14, x16, shift, y26, y27, y28, y29
+    vmull.s16       q14, \x4,  d2[2]
+    vmlal.s16       q14, \x8,  d0[0]
+    vmlal.s16       q14, \x14, d0[1]
+
+    vmull.s16       q13, \x16, d1[2]
+    vmlal.s16       q13, \x12, d1[3]
+    vmlal.s16       q13, \x10, d2[0]
+    vmlal.s16       q13, \x6,  d2[1]
+
+    vmull.s16       q15, \x4,  d2[2]
+    vmlsl.s16       q15, \x8,  d0[0]
+    vmlsl.s16       q15, \x14, d0[1]
+
+    vmull.s16       q12, \x16, d0[2]
+    vmlal.s16       q12, \x12, d0[3]
+    vmlal.s16       q12, \x10, d1[0]
+    vmlal.s16       q12, \x6,  d1[1]
+
+    vadd.s32        q10, q14, q13
+    vsub.s32        q14, q14, q13
+
+.if \shift > 16
+    vrshr.s32       q10,  q10, #\shift
+    vrshr.s32       q14,  q14, #\shift
+    vmovn.s32       \y26, q10
+    vmovn.s32       \y29, q14
+.else
+    vrshrn.s32      \y26, q10, #\shift
+    vrshrn.s32      \y29, q14, #\shift
+.endif
+
+    vadd.s32        q10, q15, q12
+    vsub.s32        q15, q15, q12
+
+.if \shift > 16
+    vrshr.s32       q10,  q10, #\shift
+    vrshr.s32       q15,  q15, #\shift
+    vmovn.s32       \y27, q10
+    vmovn.s32       \y28, q15
+.else
+    vrshrn.s32      \y27, q10, #\shift
+    vrshrn.s32      \y28, q15, #\shift
+.endif
+
+.endm
+
+asm_function jsimd_idct_4x4_neon
+
+    DCT_TABLE       .req r0
+    COEF_BLOCK      .req r1
+    OUTPUT_BUF      .req r2
+    OUTPUT_COL      .req r3
+    TMP1            .req r0
+    TMP2            .req r1
+    TMP3            .req r2
+    TMP4            .req ip
+
+    vpush           {d8-d15}
+
+    /* Load constants (d3 is just used for padding) */
+    adr             TMP4, jsimd_idct_4x4_neon_consts
+    vld1.16         {d0, d1, d2, d3}, [TMP4, :128]
+
+    /* Load all COEF_BLOCK into NEON registers with the following allocation:
+     *       0 1 2 3 | 4 5 6 7
+     *      ---------+--------
+     *   0 | d4      | d5
+     *   1 | d6      | d7
+     *   2 | d8      | d9
+     *   3 | d10     | d11
+     *   4 | -       | -
+     *   5 | d12     | d13
+     *   6 | d14     | d15
+     *   7 | d16     | d17
+     */
+    vld1.16         {d4, d5, d6, d7}, [COEF_BLOCK, :128]!
+    vld1.16         {d8, d9, d10, d11}, [COEF_BLOCK, :128]!
+    add COEF_BLOCK, COEF_BLOCK, #16
+    vld1.16         {d12, d13, d14, d15}, [COEF_BLOCK, :128]!
+    vld1.16         {d16, d17}, [COEF_BLOCK, :128]!
+    /* dequantize */
+    vld1.16         {d18, d19, d20, d21}, [DCT_TABLE, :128]!
+    vmul.s16        q2, q2, q9
+    vld1.16         {d22, d23, d24, d25}, [DCT_TABLE, :128]!
+    vmul.s16        q3, q3, q10
+    vmul.s16        q4, q4, q11
+    add             DCT_TABLE, DCT_TABLE, #16
+    vld1.16         {d26, d27, d28, d29}, [DCT_TABLE, :128]!
+    vmul.s16        q5, q5, q12
+    vmul.s16        q6, q6, q13
+    vld1.16         {d30, d31}, [DCT_TABLE, :128]!
+    vmul.s16        q7, q7, q14
+    vmul.s16        q8, q8, q15
+
+    /* Pass 1 */
+    idct_helper     d4, d6, d8, d10, d12, d14, d16, 12, d4, d6, d8, d10
+    transpose_4x4   d4, d6, d8, d10
+    idct_helper     d5, d7, d9, d11, d13, d15, d17, 12, d5, d7, d9, d11
+    transpose_4x4   d5, d7, d9, d11
+
+    /* Pass 2 */
+    idct_helper     d4, d6, d8, d10, d7, d9, d11, 19, d26, d27, d28, d29
+    transpose_4x4   d26, d27, d28, d29
+
+    /* Range limit */
+    vmov.u16        q15, #0x80
+    vadd.s16        q13, q13, q15
+    vadd.s16        q14, q14, q15
+    vqmovun.s16     d26, q13
+    vqmovun.s16     d27, q14
+
+    /* Store results to the output buffer */
+    ldmia           OUTPUT_BUF, {TMP1, TMP2, TMP3, TMP4}
+    add             TMP1, TMP1, OUTPUT_COL
+    add             TMP2, TMP2, OUTPUT_COL
+    add             TMP3, TMP3, OUTPUT_COL
+    add             TMP4, TMP4, OUTPUT_COL
+
+#if defined(__ARMEL__) && !RESPECT_STRICT_ALIGNMENT
+    /* We can use much less instructions on little endian systems if the
+     * OS kernel is not configured to trap unaligned memory accesses
+     */
+    vst1.32         {d26[0]}, [TMP1]!
+    vst1.32         {d27[0]}, [TMP3]!
+    vst1.32         {d26[1]}, [TMP2]!
+    vst1.32         {d27[1]}, [TMP4]!
+#else
+    vst1.8          {d26[0]}, [TMP1]!
+    vst1.8          {d27[0]}, [TMP3]!
+    vst1.8          {d26[1]}, [TMP1]!
+    vst1.8          {d27[1]}, [TMP3]!
+    vst1.8          {d26[2]}, [TMP1]!
+    vst1.8          {d27[2]}, [TMP3]!
+    vst1.8          {d26[3]}, [TMP1]!
+    vst1.8          {d27[3]}, [TMP3]!
+
+    vst1.8          {d26[4]}, [TMP2]!
+    vst1.8          {d27[4]}, [TMP4]!
+    vst1.8          {d26[5]}, [TMP2]!
+    vst1.8          {d27[5]}, [TMP4]!
+    vst1.8          {d26[6]}, [TMP2]!
+    vst1.8          {d27[6]}, [TMP4]!
+    vst1.8          {d26[7]}, [TMP2]!
+    vst1.8          {d27[7]}, [TMP4]!
+#endif
+
+    vpop            {d8-d15}
+    bx              lr
+
+    .unreq          DCT_TABLE
+    .unreq          COEF_BLOCK
+    .unreq          OUTPUT_BUF
+    .unreq          OUTPUT_COL
+    .unreq          TMP1
+    .unreq          TMP2
+    .unreq          TMP3
+    .unreq          TMP4
+.endfunc
+
+.purgem idct_helper
+
+/*****************************************************************************/
+
+/*
+ * jsimd_idct_2x2_neon
+ *
+ * This function contains inverse-DCT code for getting reduced-size
+ * 2x2 pixels output from an 8x8 DCT block. It uses the same  calculations
+ * and produces exactly the same output as IJG's original 'jpeg_idct_2x2'
+ * function from jpeg-6b (jidctred.c).
+ *
+ * NOTE: jpeg-8 has an improved implementation of 2x2 inverse-DCT, which
+ *       requires much less arithmetic operations and hence should be faster.
+ *       The primary purpose of this particular NEON optimized function is
+ *       bit exact compatibility with jpeg-6b.
+ */
+
+.balign 8
+jsimd_idct_2x2_neon_consts:
+    .short     -FIX_0_720959822    /* d0[0] */
+    .short     FIX_0_850430095     /* d0[1] */
+    .short     -FIX_1_272758580    /* d0[2] */
+    .short     FIX_3_624509785     /* d0[3] */
+
+.macro idct_helper x4, x6, x10, x12, x16, shift, y26, y27
+    vshll.s16  q14,  \x4,  #15
+    vmull.s16  q13,  \x6,  d0[3]
+    vmlal.s16  q13,  \x10, d0[2]
+    vmlal.s16  q13,  \x12, d0[1]
+    vmlal.s16  q13,  \x16, d0[0]
+
+    vadd.s32   q10,  q14,  q13
+    vsub.s32   q14,  q14,  q13
+
+.if \shift > 16
+    vrshr.s32  q10,  q10,  #\shift
+    vrshr.s32  q14,  q14,  #\shift
+    vmovn.s32  \y26, q10
+    vmovn.s32  \y27, q14
+.else
+    vrshrn.s32 \y26, q10,  #\shift
+    vrshrn.s32 \y27, q14,  #\shift
+.endif
+
+.endm
+
+asm_function jsimd_idct_2x2_neon
+
+    DCT_TABLE       .req r0
+    COEF_BLOCK      .req r1
+    OUTPUT_BUF      .req r2
+    OUTPUT_COL      .req r3
+    TMP1            .req r0
+    TMP2            .req ip
+
+    vpush           {d8-d15}
+
+    /* Load constants */
+    adr             TMP2, jsimd_idct_2x2_neon_consts
+    vld1.16         {d0}, [TMP2, :64]
+
+    /* Load all COEF_BLOCK into NEON registers with the following allocation:
+     *       0 1 2 3 | 4 5 6 7
+     *      ---------+--------
+     *   0 | d4      | d5
+     *   1 | d6      | d7
+     *   2 | -       | -
+     *   3 | d10     | d11
+     *   4 | -       | -
+     *   5 | d12     | d13
+     *   6 | -       | -
+     *   7 | d16     | d17
+     */
+    vld1.16         {d4, d5, d6, d7}, [COEF_BLOCK, :128]!
+    add             COEF_BLOCK, COEF_BLOCK, #16
+    vld1.16         {d10, d11}, [COEF_BLOCK, :128]!
+    add             COEF_BLOCK, COEF_BLOCK, #16
+    vld1.16         {d12, d13}, [COEF_BLOCK, :128]!
+    add             COEF_BLOCK, COEF_BLOCK, #16
+    vld1.16         {d16, d17}, [COEF_BLOCK, :128]!
+    /* Dequantize */
+    vld1.16         {d18, d19, d20, d21}, [DCT_TABLE, :128]!
+    vmul.s16        q2, q2, q9
+    vmul.s16        q3, q3, q10
+    add             DCT_TABLE, DCT_TABLE, #16
+    vld1.16         {d24, d25}, [DCT_TABLE, :128]!
+    vmul.s16        q5, q5, q12
+    add             DCT_TABLE, DCT_TABLE, #16
+    vld1.16         {d26, d27}, [DCT_TABLE, :128]!
+    vmul.s16        q6, q6, q13
+    add             DCT_TABLE, DCT_TABLE, #16
+    vld1.16         {d30, d31}, [DCT_TABLE, :128]!
+    vmul.s16        q8, q8, q15
+
+    /* Pass 1 */
+#if 0
+    idct_helper     d4, d6, d10, d12, d16, 13, d4, d6
+    transpose_4x4   d4, d6, d8,  d10
+    idct_helper     d5, d7, d11, d13, d17, 13, d5, d7
+    transpose_4x4   d5, d7, d9,  d11
+#else
+    vmull.s16       q13, d6,  d0[3]
+    vmlal.s16       q13, d10, d0[2]
+    vmlal.s16       q13, d12, d0[1]
+    vmlal.s16       q13, d16, d0[0]
+    vmull.s16       q12, d7,  d0[3]
+    vmlal.s16       q12, d11, d0[2]
+    vmlal.s16       q12, d13, d0[1]
+    vmlal.s16       q12, d17, d0[0]
+    vshll.s16       q14, d4,  #15
+    vshll.s16       q15, d5,  #15
+    vadd.s32        q10, q14, q13
+    vsub.s32        q14, q14, q13
+    vrshrn.s32      d4,  q10, #13
+    vrshrn.s32      d6,  q14, #13
+    vadd.s32        q10, q15, q12
+    vsub.s32        q14, q15, q12
+    vrshrn.s32      d5,  q10, #13
+    vrshrn.s32      d7,  q14, #13
+    vtrn.16         q2,  q3
+    vtrn.32         q3,  q5
+#endif
+
+    /* Pass 2 */
+    idct_helper     d4, d6, d10, d7, d11, 20, d26, d27
+
+    /* Range limit */
+    vmov.u16        q15, #0x80
+    vadd.s16        q13, q13, q15
+    vqmovun.s16     d26, q13
+    vqmovun.s16     d27, q13
+
+    /* Store results to the output buffer */
+    ldmia           OUTPUT_BUF, {TMP1, TMP2}
+    add             TMP1, TMP1, OUTPUT_COL
+    add             TMP2, TMP2, OUTPUT_COL
+
+    vst1.8          {d26[0]}, [TMP1]!
+    vst1.8          {d27[4]}, [TMP1]!
+    vst1.8          {d26[1]}, [TMP2]!
+    vst1.8          {d27[5]}, [TMP2]!
+
+    vpop            {d8-d15}
+    bx              lr
+
+    .unreq          DCT_TABLE
+    .unreq          COEF_BLOCK
+    .unreq          OUTPUT_BUF
+    .unreq          OUTPUT_COL
+    .unreq          TMP1
+    .unreq          TMP2
+.endfunc
+
+.purgem idct_helper
+
+/*****************************************************************************/
+
+/*
+ * jsimd_ycc_extrgb_convert_neon
+ * jsimd_ycc_extbgr_convert_neon
+ * jsimd_ycc_extrgbx_convert_neon
+ * jsimd_ycc_extbgrx_convert_neon
+ * jsimd_ycc_extxbgr_convert_neon
+ * jsimd_ycc_extxrgb_convert_neon
+ *
+ * Colorspace conversion YCbCr -> RGB
+ */
+
+
+.macro do_load size
+    .if \size == 8
+        vld1.8  {d4}, [U, :64]!
+        vld1.8  {d5}, [V, :64]!
+        vld1.8  {d0}, [Y, :64]!
+        pld     [U, #64]
+        pld     [V, #64]
+        pld     [Y, #64]
+    .elseif \size == 4
+        vld1.8  {d4[0]}, [U]!
+        vld1.8  {d4[1]}, [U]!
+        vld1.8  {d4[2]}, [U]!
+        vld1.8  {d4[3]}, [U]!
+        vld1.8  {d5[0]}, [V]!
+        vld1.8  {d5[1]}, [V]!
+        vld1.8  {d5[2]}, [V]!
+        vld1.8  {d5[3]}, [V]!
+        vld1.8  {d0[0]}, [Y]!
+        vld1.8  {d0[1]}, [Y]!
+        vld1.8  {d0[2]}, [Y]!
+        vld1.8  {d0[3]}, [Y]!
+    .elseif \size == 2
+        vld1.8  {d4[4]}, [U]!
+        vld1.8  {d4[5]}, [U]!
+        vld1.8  {d5[4]}, [V]!
+        vld1.8  {d5[5]}, [V]!
+        vld1.8  {d0[4]}, [Y]!
+        vld1.8  {d0[5]}, [Y]!
+    .elseif \size == 1
+        vld1.8  {d4[6]}, [U]!
+        vld1.8  {d5[6]}, [V]!
+        vld1.8  {d0[6]}, [Y]!
+    .else
+        .error unsupported macroblock size
+    .endif
+.endm
+
+.macro do_store bpp, size
+    .if \bpp == 24
+        .if \size == 8
+            vst3.8  {d10, d11, d12}, [RGB]!
+        .elseif \size == 4
+            vst3.8  {d10[0], d11[0], d12[0]}, [RGB]!
+            vst3.8  {d10[1], d11[1], d12[1]}, [RGB]!
+            vst3.8  {d10[2], d11[2], d12[2]}, [RGB]!
+            vst3.8  {d10[3], d11[3], d12[3]}, [RGB]!
+        .elseif \size == 2
+            vst3.8  {d10[4], d11[4], d12[4]}, [RGB]!
+            vst3.8  {d10[5], d11[5], d12[5]}, [RGB]!
+        .elseif \size == 1
+            vst3.8  {d10[6], d11[6], d12[6]}, [RGB]!
+        .else
+            .error unsupported macroblock size
+        .endif
+    .elseif \bpp == 32
+        .if \size == 8
+            vst4.8  {d10, d11, d12, d13}, [RGB]!
+        .elseif \size == 4
+            vst4.8  {d10[0], d11[0], d12[0], d13[0]}, [RGB]!
+            vst4.8  {d10[1], d11[1], d12[1], d13[1]}, [RGB]!
+            vst4.8  {d10[2], d11[2], d12[2], d13[2]}, [RGB]!
+            vst4.8  {d10[3], d11[3], d12[3], d13[3]}, [RGB]!
+        .elseif \size == 2
+            vst4.8  {d10[4], d11[4], d12[4], d13[4]}, [RGB]!
+            vst4.8  {d10[5], d11[5], d12[5], d13[5]}, [RGB]!
+        .elseif \size == 1
+            vst4.8  {d10[6], d11[6], d12[6], d13[6]}, [RGB]!
+        .else
+            .error unsupported macroblock size
+        .endif
+    .else
+        .error unsupported bpp
+    .endif
+.endm
+
+.macro generate_jsimd_ycc_rgb_convert_neon colorid, bpp, r_offs, g_offs, b_offs
+
+/*
+ * 2 stage pipelined YCbCr->RGB conversion
+ */
+
+.macro do_yuv_to_rgb_stage1
+    vaddw.u8        q3, q1, d4     /* q3 = u - 128 */
+    vaddw.u8        q4, q1, d5     /* q2 = v - 128 */
+    vmull.s16       q10, d6, d1[1] /* multiply by -11277 */
+    vmlal.s16       q10, d8, d1[2] /* multiply by -23401 */
+    vmull.s16       q11, d7, d1[1] /* multiply by -11277 */
+    vmlal.s16       q11, d9, d1[2] /* multiply by -23401 */
+    vmull.s16       q12, d8, d1[0] /* multiply by 22971 */
+    vmull.s16       q13, d9, d1[0] /* multiply by 22971 */
+    vmull.s16       q14, d6, d1[3] /* multiply by 29033 */
+    vmull.s16       q15, d7, d1[3] /* multiply by 29033 */
+.endm
+
+.macro do_yuv_to_rgb_stage2
+    vrshrn.s32      d20, q10, #15
+    vrshrn.s32      d21, q11, #15
+    vrshrn.s32      d24, q12, #14
+    vrshrn.s32      d25, q13, #14
+    vrshrn.s32      d28, q14, #14
+    vrshrn.s32      d29, q15, #14
+    vaddw.u8        q10, q10, d0
+    vaddw.u8        q12, q12, d0
+    vaddw.u8        q14, q14, d0
+    vqmovun.s16     d1\g_offs, q10
+    vqmovun.s16     d1\r_offs, q12
+    vqmovun.s16     d1\b_offs, q14
+.endm
+
+.macro do_yuv_to_rgb_stage2_store_load_stage1
+    vld1.8          {d4}, [U, :64]!
+      vrshrn.s32      d20, q10, #15
+      vrshrn.s32      d21, q11, #15
+      vrshrn.s32      d24, q12, #14
+      vrshrn.s32      d25, q13, #14
+      vrshrn.s32      d28, q14, #14
+    vld1.8          {d5}, [V, :64]!
+      vrshrn.s32      d29, q15, #14
+      vaddw.u8        q10, q10, d0
+      vaddw.u8        q12, q12, d0
+      vaddw.u8        q14, q14, d0
+      vqmovun.s16     d1\g_offs, q10
+    vld1.8          {d0}, [Y, :64]!
+      vqmovun.s16     d1\r_offs, q12
+    pld             [U, #64]
+    pld             [V, #64]
+    pld             [Y, #64]
+      vqmovun.s16     d1\b_offs, q14
+    vaddw.u8        q3, q1, d4     /* q3 = u - 128 */
+    vaddw.u8        q4, q1, d5     /* q2 = v - 128 */
+      do_store        \bpp, 8
+    vmull.s16       q10, d6, d1[1] /* multiply by -11277 */
+    vmlal.s16       q10, d8, d1[2] /* multiply by -23401 */
+    vmull.s16       q11, d7, d1[1] /* multiply by -11277 */
+    vmlal.s16       q11, d9, d1[2] /* multiply by -23401 */
+    vmull.s16       q12, d8, d1[0] /* multiply by 22971 */
+    vmull.s16       q13, d9, d1[0] /* multiply by 22971 */
+    vmull.s16       q14, d6, d1[3] /* multiply by 29033 */
+    vmull.s16       q15, d7, d1[3] /* multiply by 29033 */
+.endm
+
+.macro do_yuv_to_rgb
+    do_yuv_to_rgb_stage1
+    do_yuv_to_rgb_stage2
+.endm
+
+/* Apple gas crashes on adrl, work around that by using adr.
+ * But this requires a copy of these constants for each function.
+ */
+
+.balign 16
+jsimd_ycc_\colorid\()_neon_consts:
+    .short          0,      0,     0,      0
+    .short          22971, -11277, -23401, 29033
+    .short          -128,  -128,   -128,   -128
+    .short          -128,  -128,   -128,   -128
+
+asm_function jsimd_ycc_\colorid\()_convert_neon
+    OUTPUT_WIDTH    .req r0
+    INPUT_BUF       .req r1
+    INPUT_ROW       .req r2
+    OUTPUT_BUF      .req r3
+    NUM_ROWS        .req r4
+
+    INPUT_BUF0      .req r5
+    INPUT_BUF1      .req r6
+    INPUT_BUF2      .req INPUT_BUF
+
+    RGB             .req r7
+    Y               .req r8
+    U               .req r9
+    V               .req r10
+    N               .req ip
+
+    /* Load constants to d1, d2, d3 (d0 is just used for padding) */
+    adr             ip, jsimd_ycc_\colorid\()_neon_consts
+    vld1.16         {d0, d1, d2, d3}, [ip, :128]
+
+    /* Save ARM registers and handle input arguments */
+    push            {r4, r5, r6, r7, r8, r9, r10, lr}
+    ldr             NUM_ROWS, [sp, #(4 * 8)]
+    ldr             INPUT_BUF0, [INPUT_BUF]
+    ldr             INPUT_BUF1, [INPUT_BUF, #4]
+    ldr             INPUT_BUF2, [INPUT_BUF, #8]
+    .unreq          INPUT_BUF
+
+    /* Save NEON registers */
+    vpush           {d8-d15}
+
+    /* Initially set d10, d11, d12, d13 to 0xFF */
+    vmov.u8         q5, #255
+    vmov.u8         q6, #255
+
+    /* Outer loop over scanlines */
+    cmp             NUM_ROWS, #1
+    blt             9f
+0:
+    ldr             Y, [INPUT_BUF0, INPUT_ROW, lsl #2]
+    ldr             U, [INPUT_BUF1, INPUT_ROW, lsl #2]
+    mov             N, OUTPUT_WIDTH
+    ldr             V, [INPUT_BUF2, INPUT_ROW, lsl #2]
+    add             INPUT_ROW, INPUT_ROW, #1
+    ldr             RGB, [OUTPUT_BUF], #4
+
+    /* Inner loop over pixels */
+    subs            N, N, #8
+    blt             3f
+    do_load         8
+    do_yuv_to_rgb_stage1
+    subs            N, N, #8
+    blt             2f
+1:
+    do_yuv_to_rgb_stage2_store_load_stage1
+    subs            N, N, #8
+    bge             1b
+2:
+    do_yuv_to_rgb_stage2
+    do_store        \bpp, 8
+    tst             N, #7
+    beq             8f
+3:
+    tst             N, #4
+    beq             3f
+    do_load         4
+3:
+    tst             N, #2
+    beq             4f
+    do_load         2
+4:
+    tst             N, #1
+    beq             5f
+    do_load         1
+5:
+    do_yuv_to_rgb
+    tst             N, #4
+    beq             6f
+    do_store        \bpp, 4
+6:
+    tst             N, #2
+    beq             7f
+    do_store        \bpp, 2
+7:
+    tst             N, #1
+    beq             8f
+    do_store        \bpp, 1
+8:
+    subs            NUM_ROWS, NUM_ROWS, #1
+    bgt             0b
+9:
+    /* Restore all registers and return */
+    vpop            {d8-d15}
+    pop             {r4, r5, r6, r7, r8, r9, r10, pc}
+
+    .unreq          OUTPUT_WIDTH
+    .unreq          INPUT_ROW
+    .unreq          OUTPUT_BUF
+    .unreq          NUM_ROWS
+    .unreq          INPUT_BUF0
+    .unreq          INPUT_BUF1
+    .unreq          INPUT_BUF2
+    .unreq          RGB
+    .unreq          Y
+    .unreq          U
+    .unreq          V
+    .unreq          N
+.endfunc
+
+.purgem do_yuv_to_rgb
+.purgem do_yuv_to_rgb_stage1
+.purgem do_yuv_to_rgb_stage2
+.purgem do_yuv_to_rgb_stage2_store_load_stage1
+
+.endm
+
+/*--------------------------------- id ----- bpp R  G  B */
+generate_jsimd_ycc_rgb_convert_neon extrgb,  24, 0, 1, 2
+generate_jsimd_ycc_rgb_convert_neon extbgr,  24, 2, 1, 0
+generate_jsimd_ycc_rgb_convert_neon extrgbx, 32, 0, 1, 2
+generate_jsimd_ycc_rgb_convert_neon extbgrx, 32, 2, 1, 0
+generate_jsimd_ycc_rgb_convert_neon extxbgr, 32, 3, 2, 1
+generate_jsimd_ycc_rgb_convert_neon extxrgb, 32, 1, 2, 3
+
+.purgem do_load
+.purgem do_store
+
+/*****************************************************************************/
+
+/*
+ * jsimd_extrgb_ycc_convert_neon
+ * jsimd_extbgr_ycc_convert_neon
+ * jsimd_extrgbx_ycc_convert_neon
+ * jsimd_extbgrx_ycc_convert_neon
+ * jsimd_extxbgr_ycc_convert_neon
+ * jsimd_extxrgb_ycc_convert_neon
+ *
+ * Colorspace conversion RGB -> YCbCr
+ */
+
+.macro do_store size
+    .if \size == 8
+        vst1.8  {d20}, [Y]!
+        vst1.8  {d21}, [U]!
+        vst1.8  {d22}, [V]!
+    .elseif \size == 4
+        vst1.8  {d20[0]}, [Y]!
+        vst1.8  {d20[1]}, [Y]!
+        vst1.8  {d20[2]}, [Y]!
+        vst1.8  {d20[3]}, [Y]!
+        vst1.8  {d21[0]}, [U]!
+        vst1.8  {d21[1]}, [U]!
+        vst1.8  {d21[2]}, [U]!
+        vst1.8  {d21[3]}, [U]!
+        vst1.8  {d22[0]}, [V]!
+        vst1.8  {d22[1]}, [V]!
+        vst1.8  {d22[2]}, [V]!
+        vst1.8  {d22[3]}, [V]!
+    .elseif \size == 2
+        vst1.8  {d20[4]}, [Y]!
+        vst1.8  {d20[5]}, [Y]!
+        vst1.8  {d21[4]}, [U]!
+        vst1.8  {d21[5]}, [U]!
+        vst1.8  {d22[4]}, [V]!
+        vst1.8  {d22[5]}, [V]!
+    .elseif \size == 1
+        vst1.8  {d20[6]}, [Y]!
+        vst1.8  {d21[6]}, [U]!
+        vst1.8  {d22[6]}, [V]!
+    .else
+        .error unsupported macroblock size
+    .endif
+.endm
+
+.macro do_load bpp, size
+    .if \bpp == 24
+        .if \size == 8
+            vld3.8  {d10, d11, d12}, [RGB]!
+            pld     [RGB, #128]
+        .elseif \size == 4
+            vld3.8  {d10[0], d11[0], d12[0]}, [RGB]!
+            vld3.8  {d10[1], d11[1], d12[1]}, [RGB]!
+            vld3.8  {d10[2], d11[2], d12[2]}, [RGB]!
+            vld3.8  {d10[3], d11[3], d12[3]}, [RGB]!
+        .elseif \size == 2
+            vld3.8  {d10[4], d11[4], d12[4]}, [RGB]!
+            vld3.8  {d10[5], d11[5], d12[5]}, [RGB]!
+        .elseif \size == 1
+            vld3.8  {d10[6], d11[6], d12[6]}, [RGB]!
+        .else
+            .error unsupported macroblock size
+        .endif
+    .elseif \bpp == 32
+        .if \size == 8
+            vld4.8  {d10, d11, d12, d13}, [RGB]!
+            pld     [RGB, #128]
+        .elseif \size == 4
+            vld4.8  {d10[0], d11[0], d12[0], d13[0]}, [RGB]!
+            vld4.8  {d10[1], d11[1], d12[1], d13[1]}, [RGB]!
+            vld4.8  {d10[2], d11[2], d12[2], d13[2]}, [RGB]!
+            vld4.8  {d10[3], d11[3], d12[3], d13[3]}, [RGB]!
+        .elseif \size == 2
+            vld4.8  {d10[4], d11[4], d12[4], d13[4]}, [RGB]!
+            vld4.8  {d10[5], d11[5], d12[5], d13[5]}, [RGB]!
+        .elseif \size == 1
+            vld4.8  {d10[6], d11[6], d12[6], d13[6]}, [RGB]!
+        .else
+            .error unsupported macroblock size
+        .endif
+    .else
+        .error unsupported bpp
+    .endif
+.endm
+
+.macro generate_jsimd_rgb_ycc_convert_neon colorid, bpp, r_offs, g_offs, b_offs
+
+/*
+ * 2 stage pipelined RGB->YCbCr conversion
+ */
+
+.macro do_rgb_to_yuv_stage1
+    vmovl.u8    q2, d1\r_offs /* r = { d4, d5 } */
+    vmovl.u8    q3, d1\g_offs /* g = { d6, d7 } */
+    vmovl.u8    q4, d1\b_offs /* b = { d8, d9 } */
+    vmull.u16   q7, d4, d0[0]
+    vmlal.u16   q7, d6, d0[1]
+    vmlal.u16   q7, d8, d0[2]
+    vmull.u16   q8, d5, d0[0]
+    vmlal.u16   q8, d7, d0[1]
+    vmlal.u16   q8, d9, d0[2]
+    vrev64.32   q9,  q1
+    vrev64.32   q13, q1
+    vmlsl.u16   q9,  d4, d0[3]
+    vmlsl.u16   q9,  d6, d1[0]
+    vmlal.u16   q9,  d8, d1[1]
+    vmlsl.u16   q13, d5, d0[3]
+    vmlsl.u16   q13, d7, d1[0]
+    vmlal.u16   q13, d9, d1[1]
+    vrev64.32   q14, q1
+    vrev64.32   q15, q1
+    vmlal.u16   q14, d4, d1[1]
+    vmlsl.u16   q14, d6, d1[2]
+    vmlsl.u16   q14, d8, d1[3]
+    vmlal.u16   q15, d5, d1[1]
+    vmlsl.u16   q15, d7, d1[2]
+    vmlsl.u16   q15, d9, d1[3]
+.endm
+
+.macro do_rgb_to_yuv_stage2
+    vrshrn.u32  d20, q7,  #16
+    vrshrn.u32  d21, q8,  #16
+    vshrn.u32   d22, q9,  #16
+    vshrn.u32   d23, q13, #16
+    vshrn.u32   d24, q14, #16
+    vshrn.u32   d25, q15, #16
+    vmovn.u16   d20, q10      /* d20 = y */
+    vmovn.u16   d21, q11      /* d21 = u */
+    vmovn.u16   d22, q12      /* d22 = v */
+.endm
+
+.macro do_rgb_to_yuv
+    do_rgb_to_yuv_stage1
+    do_rgb_to_yuv_stage2
+.endm
+
+.macro do_rgb_to_yuv_stage2_store_load_stage1
+      vrshrn.u32  d20, q7,  #16
+      vrshrn.u32  d21, q8,  #16
+      vshrn.u32   d22, q9,  #16
+    vrev64.32   q9,  q1
+      vshrn.u32   d23, q13, #16
+    vrev64.32   q13, q1
+      vshrn.u32   d24, q14, #16
+      vshrn.u32   d25, q15, #16
+    do_load     \bpp, 8
+      vmovn.u16   d20, q10      /* d20 = y */
+    vmovl.u8    q2, d1\r_offs   /* r = { d4, d5 } */
+      vmovn.u16   d21, q11      /* d21 = u */
+    vmovl.u8    q3, d1\g_offs   /* g = { d6, d7 } */
+      vmovn.u16   d22, q12      /* d22 = v */
+    vmovl.u8    q4, d1\b_offs   /* b = { d8, d9 } */
+    vmull.u16   q7, d4, d0[0]
+    vmlal.u16   q7, d6, d0[1]
+    vmlal.u16   q7, d8, d0[2]
+      vst1.8      {d20}, [Y]!
+    vmull.u16   q8, d5, d0[0]
+    vmlal.u16   q8, d7, d0[1]
+    vmlal.u16   q8, d9, d0[2]
+    vmlsl.u16   q9,  d4, d0[3]
+    vmlsl.u16   q9,  d6, d1[0]
+    vmlal.u16   q9,  d8, d1[1]
+      vst1.8      {d21}, [U]!
+    vmlsl.u16   q13, d5, d0[3]
+    vmlsl.u16   q13, d7, d1[0]
+    vmlal.u16   q13, d9, d1[1]
+    vrev64.32   q14, q1
+    vrev64.32   q15, q1
+    vmlal.u16   q14, d4, d1[1]
+    vmlsl.u16   q14, d6, d1[2]
+    vmlsl.u16   q14, d8, d1[3]
+      vst1.8      {d22}, [V]!
+    vmlal.u16   q15, d5, d1[1]
+    vmlsl.u16   q15, d7, d1[2]
+    vmlsl.u16   q15, d9, d1[3]
+.endm
+
+.balign 16
+jsimd_\colorid\()_ycc_neon_consts:
+    .short          19595, 38470, 7471,  11059
+    .short          21709, 32768, 27439, 5329
+    .short          32767, 128,   32767, 128
+    .short          32767, 128,   32767, 128
+
+asm_function jsimd_\colorid\()_ycc_convert_neon
+    OUTPUT_WIDTH    .req r0
+    INPUT_BUF       .req r1
+    OUTPUT_BUF      .req r2
+    OUTPUT_ROW      .req r3
+    NUM_ROWS        .req r4
+
+    OUTPUT_BUF0     .req r5
+    OUTPUT_BUF1     .req r6
+    OUTPUT_BUF2     .req OUTPUT_BUF
+
+    RGB             .req r7
+    Y               .req r8
+    U               .req r9
+    V               .req r10
+    N               .req ip
+
+    /* Load constants to d0, d1, d2, d3 */
+    adr             ip, jsimd_\colorid\()_ycc_neon_consts
+    vld1.16         {d0, d1, d2, d3}, [ip, :128]
+
+    /* Save ARM registers and handle input arguments */
+    push            {r4, r5, r6, r7, r8, r9, r10, lr}
+    ldr             NUM_ROWS, [sp, #(4 * 8)]
+    ldr             OUTPUT_BUF0, [OUTPUT_BUF]
+    ldr             OUTPUT_BUF1, [OUTPUT_BUF, #4]
+    ldr             OUTPUT_BUF2, [OUTPUT_BUF, #8]
+    .unreq          OUTPUT_BUF
+
+    /* Save NEON registers */
+    vpush           {d8-d15}
+
+    /* Outer loop over scanlines */
+    cmp             NUM_ROWS, #1
+    blt             9f
+0:
+    ldr             Y, [OUTPUT_BUF0, OUTPUT_ROW, lsl #2]
+    ldr             U, [OUTPUT_BUF1, OUTPUT_ROW, lsl #2]
+    mov             N, OUTPUT_WIDTH
+    ldr             V, [OUTPUT_BUF2, OUTPUT_ROW, lsl #2]
+    add             OUTPUT_ROW, OUTPUT_ROW, #1
+    ldr             RGB, [INPUT_BUF], #4
+
+    /* Inner loop over pixels */
+    subs            N, N, #8
+    blt             3f
+    do_load         \bpp, 8
+    do_rgb_to_yuv_stage1
+    subs            N, N, #8
+    blt             2f
+1:
+    do_rgb_to_yuv_stage2_store_load_stage1
+    subs            N, N, #8
+    bge             1b
+2:
+    do_rgb_to_yuv_stage2
+    do_store        8
+    tst             N, #7
+    beq             8f
+3:
+    tst             N, #4
+    beq             3f
+    do_load         \bpp, 4
+3:
+    tst             N, #2
+    beq             4f
+    do_load         \bpp, 2
+4:
+    tst             N, #1
+    beq             5f
+    do_load         \bpp, 1
+5:
+    do_rgb_to_yuv
+    tst             N, #4
+    beq             6f
+    do_store        4
+6:
+    tst             N, #2
+    beq             7f
+    do_store        2
+7:
+    tst             N, #1
+    beq             8f
+    do_store        1
+8:
+    subs            NUM_ROWS, NUM_ROWS, #1
+    bgt             0b
+9:
+    /* Restore all registers and return */
+    vpop            {d8-d15}
+    pop             {r4, r5, r6, r7, r8, r9, r10, pc}
+
+    .unreq          OUTPUT_WIDTH
+    .unreq          OUTPUT_ROW
+    .unreq          INPUT_BUF
+    .unreq          NUM_ROWS
+    .unreq          OUTPUT_BUF0
+    .unreq          OUTPUT_BUF1
+    .unreq          OUTPUT_BUF2
+    .unreq          RGB
+    .unreq          Y
+    .unreq          U
+    .unreq          V
+    .unreq          N
+.endfunc
+
+.purgem do_rgb_to_yuv
+.purgem do_rgb_to_yuv_stage1
+.purgem do_rgb_to_yuv_stage2
+.purgem do_rgb_to_yuv_stage2_store_load_stage1
+
+.endm
+
+/*--------------------------------- id ----- bpp R  G  B */
+generate_jsimd_rgb_ycc_convert_neon extrgb,  24, 0, 1, 2
+generate_jsimd_rgb_ycc_convert_neon extbgr,  24, 2, 1, 0
+generate_jsimd_rgb_ycc_convert_neon extrgbx, 32, 0, 1, 2
+generate_jsimd_rgb_ycc_convert_neon extbgrx, 32, 2, 1, 0
+generate_jsimd_rgb_ycc_convert_neon extxbgr, 32, 3, 2, 1
+generate_jsimd_rgb_ycc_convert_neon extxrgb, 32, 1, 2, 3
+
+.purgem do_load
+.purgem do_store
+
+/*****************************************************************************/
+
+/*
+ * Load data into workspace, applying unsigned->signed conversion
+ *
+ * TODO: can be combined with 'jsimd_fdct_ifast_neon' to get
+ *       rid of VST1.16 instructions
+ */
+
+asm_function jsimd_convsamp_neon
+    SAMPLE_DATA     .req r0
+    START_COL       .req r1
+    WORKSPACE       .req r2
+    TMP1            .req r3
+    TMP2            .req r4
+    TMP3            .req r5
+    TMP4            .req ip
+
+    push            {r4, r5}
+    vmov.u8         d0, #128
+
+    ldmia           SAMPLE_DATA!, {TMP1, TMP2, TMP3, TMP4}
+    add             TMP1, TMP1, START_COL
+    add             TMP2, TMP2, START_COL
+    add             TMP3, TMP3, START_COL
+    add             TMP4, TMP4, START_COL
+    vld1.8          {d16}, [TMP1]
+    vsubl.u8        q8, d16, d0
+    vld1.8          {d18}, [TMP2]
+    vsubl.u8        q9, d18, d0
+    vld1.8          {d20}, [TMP3]
+    vsubl.u8        q10, d20, d0
+    vld1.8          {d22}, [TMP4]
+    ldmia           SAMPLE_DATA!, {TMP1, TMP2, TMP3, TMP4}
+    vsubl.u8        q11, d22, d0
+    vst1.16         {d16, d17, d18, d19}, [WORKSPACE, :128]!
+    add             TMP1, TMP1, START_COL
+    add             TMP2, TMP2, START_COL
+    vst1.16         {d20, d21, d22, d23}, [WORKSPACE, :128]!
+    add             TMP3, TMP3, START_COL
+    add             TMP4, TMP4, START_COL
+    vld1.8          {d24}, [TMP1]
+    vsubl.u8        q12, d24, d0
+    vld1.8          {d26}, [TMP2]
+    vsubl.u8        q13, d26, d0
+    vld1.8          {d28}, [TMP3]
+    vsubl.u8        q14, d28, d0
+    vld1.8          {d30}, [TMP4]
+    vsubl.u8        q15, d30, d0
+    vst1.16         {d24, d25, d26, d27}, [WORKSPACE, :128]!
+    vst1.16         {d28, d29, d30, d31}, [WORKSPACE, :128]!
+    pop             {r4, r5}
+    bx              lr
+
+    .unreq          SAMPLE_DATA
+    .unreq          START_COL
+    .unreq          WORKSPACE
+    .unreq          TMP1
+    .unreq          TMP2
+    .unreq          TMP3
+    .unreq          TMP4
+.endfunc
+
+/*****************************************************************************/
+
+/*
+ * jsimd_fdct_ifast_neon
+ *
+ * This function contains a fast, not so accurate integer implementation of
+ * the forward DCT (Discrete Cosine Transform). It uses the same calculations
+ * and produces exactly the same output as IJG's original 'jpeg_fdct_ifast'
+ * function from jfdctfst.c
+ *
+ * TODO: can be combined with 'jsimd_convsamp_neon' to get
+ *       rid of a bunch of VLD1.16 instructions
+ */
+
+#define XFIX_0_382683433 d0[0]
+#define XFIX_0_541196100 d0[1]
+#define XFIX_0_707106781 d0[2]
+#define XFIX_1_306562965 d0[3]
+
+.balign 16
+jsimd_fdct_ifast_neon_consts:
+    .short (98 * 128)              /* XFIX_0_382683433 */
+    .short (139 * 128)             /* XFIX_0_541196100 */
+    .short (181 * 128)             /* XFIX_0_707106781 */
+    .short (334 * 128 - 256 * 128) /* XFIX_1_306562965 */
+
+asm_function jsimd_fdct_ifast_neon
+
+    DATA            .req r0
+    TMP             .req ip
+
+    vpush           {d8-d15}
+
+    /* Load constants */
+    adr             TMP, jsimd_fdct_ifast_neon_consts
+    vld1.16         {d0}, [TMP, :64]
+
+    /* Load all DATA into NEON registers with the following allocation:
+     *       0 1 2 3 | 4 5 6 7
+     *      ---------+--------
+     *   0 | d16     | d17    | q8
+     *   1 | d18     | d19    | q9
+     *   2 | d20     | d21    | q10
+     *   3 | d22     | d23    | q11
+     *   4 | d24     | d25    | q12
+     *   5 | d26     | d27    | q13
+     *   6 | d28     | d29    | q14
+     *   7 | d30     | d31    | q15
+     */
+
+    vld1.16         {d16, d17, d18, d19}, [DATA, :128]!
+    vld1.16         {d20, d21, d22, d23}, [DATA, :128]!
+    vld1.16         {d24, d25, d26, d27}, [DATA, :128]!
+    vld1.16         {d28, d29, d30, d31}, [DATA, :128]
+    sub             DATA, DATA, #(128 - 32)
+
+    mov             TMP, #2
+1:
+    /* Transpose */
+    vtrn.16         q12, q13
+    vtrn.16         q10, q11
+    vtrn.16         q8,  q9
+    vtrn.16         q14, q15
+    vtrn.32         q9,  q11
+    vtrn.32         q13, q15
+    vtrn.32         q8,  q10
+    vtrn.32         q12, q14
+    vswp            d30, d23
+    vswp            d24, d17
+    vswp            d26, d19
+      /* 1-D FDCT */
+      vadd.s16        q2,  q11, q12
+    vswp            d28, d21
+      vsub.s16        q12, q11, q12
+      vsub.s16        q6,  q10, q13
+      vadd.s16        q10, q10, q13
+      vsub.s16        q7,  q9,  q14
+      vadd.s16        q9,  q9,  q14
+      vsub.s16        q1,  q8,  q15
+      vadd.s16        q8,  q8,  q15
+      vsub.s16        q4,  q9,  q10
+      vsub.s16        q5,  q8,  q2
+      vadd.s16        q3,  q9,  q10
+      vadd.s16        q4,  q4,  q5
+      vadd.s16        q2,  q8,  q2
+      vqdmulh.s16     q4,  q4,  XFIX_0_707106781
+      vadd.s16        q11, q12, q6
+      vadd.s16        q8,  q2,  q3
+      vsub.s16        q12, q2,  q3
+      vadd.s16        q3,  q6,  q7
+      vadd.s16        q7,  q7,  q1
+      vqdmulh.s16     q3,  q3,  XFIX_0_707106781
+      vsub.s16        q6,  q11, q7
+      vadd.s16        q10, q5,  q4
+      vqdmulh.s16     q6,  q6,  XFIX_0_382683433
+      vsub.s16        q14, q5,  q4
+      vqdmulh.s16     q11, q11, XFIX_0_541196100
+      vqdmulh.s16     q5,  q7,  XFIX_1_306562965
+      vadd.s16        q4,  q1,  q3
+      vsub.s16        q3,  q1,  q3
+      vadd.s16        q7,  q7,  q6
+      vadd.s16        q11, q11, q6
+      vadd.s16        q7,  q7,  q5
+      vadd.s16        q13, q3,  q11
+      vsub.s16        q11, q3,  q11
+      vadd.s16        q9,  q4,  q7
+      vsub.s16        q15, q4,  q7
+    subs            TMP, TMP, #1
+    bne             1b
+
+    /* store results */
+    vst1.16         {d16, d17, d18, d19}, [DATA, :128]!
+    vst1.16         {d20, d21, d22, d23}, [DATA, :128]!
+    vst1.16         {d24, d25, d26, d27}, [DATA, :128]!
+    vst1.16         {d28, d29, d30, d31}, [DATA, :128]
+
+    vpop            {d8-d15}
+    bx              lr
+
+    .unreq          DATA
+    .unreq          TMP
+.endfunc
+
+/*****************************************************************************/
+
+/*
+ * GLOBAL(void)
+ * jsimd_quantize_neon (JCOEFPTR coef_block, DCTELEM * divisors,
+ *                      DCTELEM * workspace);
+ *
+ * Note: the code uses 2 stage pipelining in order to improve instructions
+ *       scheduling and eliminate stalls (this provides ~15% better
+ *       performance for this function on both ARM Cortex-A8 and
+ *       ARM Cortex-A9 when compared to the non-pipelined variant).
+ *       The instructions which belong to the second stage use different
+ *       indentation for better readiability.
+ */
+asm_function jsimd_quantize_neon
+
+    COEF_BLOCK      .req r0
+    DIVISORS        .req r1
+    WORKSPACE       .req r2
+
+    RECIPROCAL      .req DIVISORS
+    CORRECTION      .req r3
+    SHIFT           .req ip
+    LOOP_COUNT      .req r4
+
+    vld1.16         {d0, d1, d2, d3}, [WORKSPACE, :128]!
+    vabs.s16        q12, q0
+    add             CORRECTION, DIVISORS, #(64 * 2)
+    add             SHIFT, DIVISORS, #(64 * 6)
+    vld1.16         {d20, d21, d22, d23}, [CORRECTION, :128]!
+    vabs.s16        q13, q1
+    vld1.16         {d16, d17, d18, d19}, [RECIPROCAL, :128]!
+    vadd.u16        q12, q12, q10 /* add correction */
+    vadd.u16        q13, q13, q11
+    vmull.u16       q10, d24, d16 /* multiply by reciprocal */
+    vmull.u16       q11, d25, d17
+    vmull.u16       q8,  d26, d18
+    vmull.u16       q9,  d27, d19
+    vld1.16         {d24, d25, d26, d27}, [SHIFT, :128]!
+    vshrn.u32       d20, q10, #16
+    vshrn.u32       d21, q11, #16
+    vshrn.u32       d22, q8,  #16
+    vshrn.u32       d23, q9,  #16
+    vneg.s16        q12, q12
+    vneg.s16        q13, q13
+    vshr.s16        q2,  q0,  #15 /* extract sign */
+    vshr.s16        q3,  q1,  #15
+    vshl.u16        q14, q10, q12 /* shift */
+    vshl.u16        q15, q11, q13
+
+    push            {r4, r5}
+    mov             LOOP_COUNT, #3
+1:
+    vld1.16         {d0, d1, d2, d3}, [WORKSPACE, :128]!
+      veor.u16        q14, q14, q2  /* restore sign */
+    vabs.s16        q12, q0
+    vld1.16         {d20, d21, d22, d23}, [CORRECTION, :128]!
+    vabs.s16        q13, q1
+      veor.u16        q15, q15, q3
+    vld1.16         {d16, d17, d18, d19}, [RECIPROCAL, :128]!
+    vadd.u16        q12, q12, q10 /* add correction */
+    vadd.u16        q13, q13, q11
+    vmull.u16       q10, d24, d16 /* multiply by reciprocal */
+    vmull.u16       q11, d25, d17
+    vmull.u16       q8,  d26, d18
+    vmull.u16       q9,  d27, d19
+      vsub.u16        q14, q14, q2
+    vld1.16         {d24, d25, d26, d27}, [SHIFT, :128]!
+      vsub.u16        q15, q15, q3
+    vshrn.u32       d20, q10, #16
+    vshrn.u32       d21, q11, #16
+      vst1.16         {d28, d29, d30, d31}, [COEF_BLOCK, :128]!
+    vshrn.u32       d22, q8,  #16
+    vshrn.u32       d23, q9,  #16
+    vneg.s16        q12, q12
+    vneg.s16        q13, q13
+    vshr.s16        q2,  q0,  #15 /* extract sign */
+    vshr.s16        q3,  q1,  #15
+    vshl.u16        q14, q10, q12 /* shift */
+    vshl.u16        q15, q11, q13
+    subs            LOOP_COUNT, LOOP_COUNT, #1
+    bne             1b
+    pop             {r4, r5}
+
+      veor.u16        q14, q14, q2  /* restore sign */
+      veor.u16        q15, q15, q3
+      vsub.u16        q14, q14, q2
+      vsub.u16        q15, q15, q3
+      vst1.16         {d28, d29, d30, d31}, [COEF_BLOCK, :128]!
+
+    bx              lr /* return */
+
+    .unreq          COEF_BLOCK
+    .unreq          DIVISORS
+    .unreq          WORKSPACE
+    .unreq          RECIPROCAL
+    .unreq          CORRECTION
+    .unreq          SHIFT
+    .unreq          LOOP_COUNT
+.endfunc
diff --git a/src/libmatrix/COPYING b/src/libmatrix/COPYING
new file mode 100644
index 0000000..3e4d480
--- /dev/null
+++ b/src/libmatrix/COPYING
@@ -0,0 +1,21 @@
+The MIT License
+
+Copyright (c) 2010 Linaro Limited
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/src/libmatrix/Makefile b/src/libmatrix/Makefile
new file mode 100644
index 0000000..418311f
--- /dev/null
+++ b/src/libmatrix/Makefile
@@ -0,0 +1,42 @@
+CXXFLAGS = -Wall -Werror -pedantic -O3
+LIBMATRIX = libmatrix.a
+LIBSRCS = mat.cc program.cc log.cc util.cc shader-source.cc
+LIBOBJS = $(LIBSRCS:.cc=.o)
+TESTDIR = test
+LIBMATRIX_TESTS = $(TESTDIR)/libmatrix_test
+TESTSRCS = $(TESTDIR)/options.cc \
+           $(TESTDIR)/const_vec_test.cc \
+           $(TESTDIR)/inverse_test.cc \
+           $(TESTDIR)/transpose_test.cc \
+           $(TESTDIR)/shader_source_test.cc \
+           $(TESTDIR)/util_split_test.cc \
+           $(TESTDIR)/libmatrix_test.cc
+TESTOBJS = $(TESTSRCS:.cc=.o)
+
+# Make sure to build both the library targets and the tests, and generate 
+# a make failure if the tests don't pass.
+default: $(LIBMATRIX) $(LIBMATRIX_TESTS) run_tests
+
+# Main library targets here.
+mat.o : mat.cc mat.h vec.h
+program.o: program.cc program.h mat.h vec.h
+log.o: log.cc log.h
+util.o: util.cc util.h
+shader-source.o: shader-source.cc shader-source.h mat.h vec.h util.h
+libmatrix.a : mat.o stack.h program.o log.o util.o shader-source.o
+	$(AR) -r $@  $(LIBOBJS)
+
+# Tests and execution targets here.
+$(TESTDIR)/options.o: $(TESTDIR)/options.cc $(TESTDIR)/libmatrix_test.h
+$(TESTDIR)/libmatrix_test.o: $(TESTDIR)/libmatrix_test.cc $(TESTDIR)/libmatrix_test.h $(TESTDIR)/inverse_test.h $(TESTDIR)/transpose_test.h
+$(TESTDIR)/const_vec_test.o: $(TESTDIR)/const_vec_test.cc $(TESTDIR)/const_vec_test.h $(TESTDIR)/libmatrix_test.h vec.h
+$(TESTDIR)/inverse_test.o: $(TESTDIR)/inverse_test.cc $(TESTDIR)/inverse_test.h $(TESTDIR)/libmatrix_test.h mat.h
+$(TESTDIR)/transpose_test.o: $(TESTDIR)/transpose_test.cc $(TESTDIR)/transpose_test.h $(TESTDIR)/libmatrix_test.h mat.h
+$(TESTDIR)/shader_source_test.o: $(TESTDIR)/shader_source_test.cc $(TESTDIR)/shader_source_test.h $(TESTDIR)/libmatrix_test.h shader-source.h
+$(TESTDIR)/util_split_test.o: $(TESTDIR)/util_split_test.cc $(TESTDIR)/util_split_test.h $(TESTDIR)/libmatrix_test.h util.h
+$(TESTDIR)/libmatrix_test: $(TESTOBJS) libmatrix.a
+	$(CXX) -o $@ $^
+run_tests: $(LIBMATRIX_TESTS)
+	$(LIBMATRIX_TESTS)
+clean :
+	$(RM) $(LIBOBJS) $(TESTOBJS) $(LIBMATRIX) $(LIBMATRIX_TESTS)
diff --git a/src/libmatrix/README b/src/libmatrix/README
new file mode 100644
index 0000000..17229f6
--- /dev/null
+++ b/src/libmatrix/README
@@ -0,0 +1,11 @@
+libmatrix
+=========
+
+A simple C++ template library that provides containers and arithmetic 
+operations for vectors, matrices and matrix stacks of 2, 3 and 4 dimensions.
+Additionally, it provides implementations of the more common matrix 
+transformations described by the OpenGL programming guide.  libmatrix does
+not make any OpenGL calls, it merely replaces a portion of the fixed-function
+vertex processing API that have been removed from newer releases of core OpenGL
+and omitted from OpenGL ES.  The goal is simply to provide developers an easier
+point of entry into developing for OpenGL and OpenGL ES. 
diff --git a/src/libmatrix/gl-if.h b/src/libmatrix/gl-if.h
new file mode 100644
index 0000000..89b84e9
--- /dev/null
+++ b/src/libmatrix/gl-if.h
@@ -0,0 +1,18 @@
+//
+// Copyright (c) 2012 Linaro Limited
+//
+// All rights reserved. This program and the accompanying materials
+// are made available under the terms of the MIT License which accompanies
+// this distribution, and is available at
+// http://www.opensource.org/licenses/mit-license.php
+//
+// Contributors:
+//     Jesse Barker - original implementation.
+//
+#ifndef GL_IF_H_
+#define GL_IF_H_
+// Inclusion abstraction to provide project specific interface headers for
+// whatever flavor of OpenGL(|ES) is appropriate.  For core libmatrix, this
+// is GLEW.
+#include "gl-headers.h"
+#endif // GL_IF_H_
diff --git a/src/libmatrix/log.cc b/src/libmatrix/log.cc
new file mode 100644
index 0000000..10603ae
--- /dev/null
+++ b/src/libmatrix/log.cc
@@ -0,0 +1,173 @@
+//
+// Copyright (c) 2010-2012 Linaro Limited
+//
+// All rights reserved. This program and the accompanying materials
+// are made available under the terms of the MIT License which accompanies
+// this distribution, and is available at
+// http://www.opensource.org/licenses/mit-license.php
+//
+// Contributors:
+//     Alexandros Frantzis <alexandros.frantzis@linaro.org>
+//     Jesse Barker <jesse.barker@linaro.org>
+//
+#include <unistd.h>
+#include <cstdio>
+#include <cstdarg>
+#include <string>
+#include <sstream>
+#include <iostream>
+#include "log.h"
+
+#ifdef ANDROID
+#include <android/log.h>
+#endif
+
+using std::string;
+
+const string Log::continuation_prefix("\x10");
+string Log::appname_;
+bool Log::do_debug_(false);
+std::ostream* Log::extra_out_(0);
+
+static const string terminal_color_normal("\033[0m");
+static const string terminal_color_red("\033[1;31m");
+static const string terminal_color_cyan("\033[36m");
+static const string terminal_color_yellow("\033[33m");
+static const string empty;
+
+static void
+print_prefixed_message(std::ostream& stream, const string& color, const string& prefix,
+                       const string& fmt, va_list ap)
+{
+    va_list aq;
+
+    /* Estimate message size */
+    va_copy(aq, ap);
+    int msg_size = vsnprintf(NULL, 0, fmt.c_str(), aq);
+    va_end(aq);
+
+    /* Create the buffer to hold the message */
+    char *buf = new char[msg_size + 1];
+
+    /* Store the message in the buffer */
+    va_copy(aq, ap);
+    vsnprintf(buf, msg_size + 1, fmt.c_str(), aq);
+    va_end(aq);
+
+    /*
+     * Print the message lines prefixed with the supplied prefix.
+     * If the target stream is a terminal make the prefix colored.
+     */
+    string linePrefix;
+    if (!prefix.empty())
+    {
+        static const string colon(": ");
+        string start_color;
+        string end_color;
+        if (!color.empty())
+        {
+            start_color = color;
+            end_color = terminal_color_normal;
+        }
+        linePrefix = start_color + prefix + end_color + colon;
+    }
+
+    std::string line;
+    std::stringstream ss(buf);
+
+    while(std::getline(ss, line)) {
+        /*
+         * If this line is a continuation of a previous log message
+         * just print the line plainly.
+         */
+        if (line[0] == Log::continuation_prefix[0]) {
+            stream << line.c_str() + 1;
+        }
+        else {
+            /* Normal line, emit the prefix. */
+            stream << linePrefix << line;
+        }
+
+        /* Only emit a newline if the original message has it. */
+        if (!(ss.rdstate() & std::stringstream::eofbit))
+            stream << std::endl;
+    }
+
+    delete[] buf;
+}
+
+
+void
+Log::info(const char *fmt, ...)
+{
+    static const string infoprefix("Info");
+    const string& prefix(do_debug_ ? infoprefix : empty);
+    va_list ap;
+    va_start(ap, fmt);
+
+#ifndef ANDROID
+    static const string& infocolor(isatty(fileno(stdout)) ? terminal_color_cyan : empty);
+    const string& color(do_debug_ ? infocolor : empty);
+    print_prefixed_message(std::cout, color, prefix, fmt, ap);
+#else
+    __android_log_vprint(ANDROID_LOG_INFO, appname_.c_str(), fmt, ap);
+#endif
+
+    if (extra_out_)
+        print_prefixed_message(*extra_out_, empty, prefix, fmt, ap);
+
+    va_end(ap);
+}
+
+void
+Log::debug(const char *fmt, ...)
+{
+    static const string dbgprefix("Debug");
+    if (!do_debug_)
+        return;
+    va_list ap;
+    va_start(ap, fmt);
+
+#ifndef ANDROID
+    static const string& dbgcolor(isatty(fileno(stdout)) ? terminal_color_yellow : empty);
+    print_prefixed_message(std::cout, dbgcolor, dbgprefix, fmt, ap);
+#else
+    __android_log_vprint(ANDROID_LOG_DEBUG, appname_.c_str(), fmt, ap);
+#endif
+
+    if (extra_out_)
+        print_prefixed_message(*extra_out_, empty, dbgprefix, fmt, ap);
+
+    va_end(ap);
+}
+
+void
+Log::error(const char *fmt, ...)
+{
+    static const string errprefix("Error");
+    va_list ap;
+    va_start(ap, fmt);
+
+#ifndef ANDROID
+    static const string& errcolor(isatty(fileno(stderr)) ? terminal_color_red : empty);
+    print_prefixed_message(std::cerr, errcolor, errprefix, fmt, ap);
+#else
+    __android_log_vprint(ANDROID_LOG_ERROR, appname_.c_str(), fmt, ap);
+#endif
+
+    if (extra_out_)
+        print_prefixed_message(*extra_out_, empty, errprefix, fmt, ap);
+
+    va_end(ap);
+}
+
+void
+Log::flush()
+{
+#ifndef ANDROID
+    std::cout.flush();
+    std::cerr.flush();
+#endif
+    if (extra_out_)
+        extra_out_->flush();
+}
diff --git a/src/libmatrix/log.h b/src/libmatrix/log.h
new file mode 100644
index 0000000..9054323
--- /dev/null
+++ b/src/libmatrix/log.h
@@ -0,0 +1,51 @@
+//
+// Copyright (c) 2010-2012 Linaro Limited
+//
+// All rights reserved. This program and the accompanying materials
+// are made available under the terms of the MIT License which accompanies
+// this distribution, and is available at
+// http://www.opensource.org/licenses/mit-license.php
+//
+// Contributors:
+//     Alexandros Frantzis <alexandros.frantzis@linaro.org>
+//     Jesse Barker <jesse.barker@linaro.org>
+//
+#ifndef LOG_H_
+#define LOG_H_
+
+#include <string>
+#include <iostream>
+
+class Log
+{
+public:
+    static void init(const std::string& appname, bool do_debug = false,
+                     std::ostream *extra_out = 0)
+    {
+        appname_ = appname;
+        do_debug_ = do_debug;
+        extra_out_ = extra_out;
+    }
+    // Emit an informational message
+    static void info(const char *fmt, ...);
+    // Emit a debugging message
+    static void debug(const char *fmt, ...);
+    // Emit an error message
+    static void error(const char *fmt, ...);
+    // Explicit flush of the log buffer
+    static void flush();
+    // A prefix constant that informs the logging infrastructure that the log
+    // message is a continuation of a previous log message to be put on the
+    // same line.
+    static const std::string continuation_prefix;
+private:
+    // A constant for identifying the log messages as originating from a
+    // particular application.
+    static std::string appname_;
+    // Indicates whether debug level messages should generate any output
+    static bool do_debug_;
+    // Extra stream to output log messages to
+    static std::ostream *extra_out_;
+};
+
+#endif /* LOG_H_ */
diff --git a/src/libmatrix/mat.cc b/src/libmatrix/mat.cc
new file mode 100644
index 0000000..93ef63c
--- /dev/null
+++ b/src/libmatrix/mat.cc
@@ -0,0 +1,173 @@
+//
+// Copyright (c) 2010 Linaro Limited
+//
+// All rights reserved. This program and the accompanying materials
+// are made available under the terms of the MIT License which accompanies
+// this distribution, and is available at
+// http://www.opensource.org/licenses/mit-license.php
+//
+// Contributors:
+//     Jesse Barker - original implementation.
+//
+#include <math.h>
+#include "mat.h"
+
+namespace LibMatrix
+{
+namespace Mat4
+{
+
+mat4
+translate(float x, float y, float z)
+{
+    mat4 t;
+    t[0][3] = x;
+    t[1][3] = y;
+    t[2][3] = z;
+    return t;
+}
+
+mat4
+scale(float x, float y, float z)
+{
+    mat4 s;
+    s[0][0] = x;
+    s[1][1] = y;
+    s[2][2] = z;
+    return s;
+}
+
+//
+// As per the OpenGL "red book" definition of rotation, from the appendix
+// on Homogeneous Coordinates and Transformation Matrices, the "upper left"
+// 3x3 portion of the result matrix is formed by:
+//
+// M = uuT + (cos a)(I - uuT) + (sin a)S
+//
+// where u is the normalized input vector, uuT is the outer product of that
+// vector and its transpose, I is the identity matrix and S is the matrix:
+//
+// |  0  -z'  y' |
+// |  z'  0  -x' |
+// | -y'  x'  0  |
+//
+// where x', y' and z' are the elements of u
+//
+mat4
+rotate(float angle, float x, float y, float z)
+{
+    vec3 u(x, y, z);
+    u.normalize();
+    mat3 uuT = outer(u, u);
+    mat3 s;   
+    s[0][0] = 0;
+    s[0][1] = -u.z();
+    s[0][2] = u.y();
+    s[1][0] = u.z();
+    s[1][1] = 0;
+    s[1][2] = -u.x();
+    s[2][0] = -u.y();
+    s[2][1] = u.x();
+    s[2][2] = 0;
+    mat3 i;
+    i -= uuT;
+    // degrees to radians
+    float angleRadians(angle * M_PI / 180.0);
+    i *= cos(angleRadians);
+    s *= sin(angleRadians);
+    i += s;
+    mat3 m = uuT + i;
+    mat4 r;
+    r[0][0] = m[0][0];
+    r[0][1] = m[0][1];
+    r[0][2] = m[0][2];
+    r[1][0] = m[1][0];
+    r[1][1] = m[1][1];
+    r[1][2] = m[1][2];
+    r[2][0] = m[2][0];
+    r[2][1] = m[2][1];
+    r[2][2] = m[2][2];
+    return r;
+}
+
+mat4
+frustum(float left, float right, float bottom, float top, float near, float far)
+{
+    float twiceNear(2 * near);
+    float width(right - left);
+    float height(top - bottom);
+    float depth(far - near);
+    mat4 f;
+    f[0][0] = twiceNear / width;
+    f[0][2] = (right + left) / width;
+    f[1][1] = twiceNear / height;
+    f[1][2] = (top + bottom) / height;
+    f[2][2] = -(far + near) / depth;
+    f[2][3] = -(twiceNear * far) / depth;
+    f[3][2] = -1;
+    f[3][3] = 0;
+    return f;
+}
+
+mat4
+ortho(float left, float right, float bottom, float top, float near, float far)
+{
+    float width(right - left);
+    float height(top - bottom);
+    float depth(far - near);
+    mat4 o;
+    o[0][0] = 2 / width;
+    o[0][3] = (right + left) / width;
+    o[1][1] = 2 / height;
+    o[1][3] = (top + bottom) / height;
+    o[2][2] = -2 / depth;
+    o[2][3] = (far + near) / depth;
+    return o;
+}
+
+mat4
+perspective(float fovy, float aspect, float zNear, float zFar)
+{
+    // degrees to radians
+    float fovyRadians(fovy * M_PI / 180.0);
+    // cotangent(x) = 1/tan(x)
+    float f = 1/tan(fovyRadians / 2);
+    float depth(zNear - zFar);
+    mat4 p;
+    p[0][0] = f / aspect;
+    p[1][1] = f;
+    p[2][2] = (zFar + zNear) / depth;
+    p[2][3] = (2 * zFar * zNear) / depth;
+    p[3][2] = -1;
+    p[3][3] = 0;
+    return p;
+}
+
+mat4 lookAt(float eyeX, float eyeY, float eyeZ, 
+    float centerX, float centerY, float centerZ, 
+    float upX, float upY, float upZ)
+{
+    vec3 f(centerX - eyeX, centerY - eyeY, centerZ - eyeZ);
+    f.normalize();
+    vec3 up(upX, upY, upZ);
+    vec3 s = vec3::cross(f, up);
+    vec3 u = vec3::cross(s, f);
+    s.normalize();
+    u.normalize();
+    mat4 la;
+    la[0][0] = s.x();
+    la[0][1] = s.y();
+    la[0][2] = s.z();
+    la[1][0] = u.x();
+    la[1][1] = u.y();
+    la[1][2] = u.z();
+    la[2][0] = -f.x();
+    la[2][1] = -f.y();
+    la[2][2] = -f.z();
+    la *= translate(-eyeX, -eyeY, -eyeZ);
+    return la;
+}
+
+} // namespace Mat4
+
+} // namespace LibMatrix
diff --git a/src/libmatrix/mat.h b/src/libmatrix/mat.h
new file mode 100644
index 0000000..a55cd45
--- /dev/null
+++ b/src/libmatrix/mat.h
@@ -0,0 +1,1221 @@
+//
+// Copyright (c) 2010 Linaro Limited
+//
+// All rights reserved. This program and the accompanying materials
+// are made available under the terms of the MIT License which accompanies
+// this distribution, and is available at
+// http://www.opensource.org/licenses/mit-license.php
+//
+// Contributors:
+//     Jesse Barker - original implementation.
+//
+#ifndef MAT_H_
+#define MAT_H_
+#include <stdexcept>
+#include <iostream>
+#include <iomanip>
+#include "vec.h"
+#ifndef USE_EXCEPTIONS
+// If we're not throwing exceptions, we'll need the logger to make sure the
+// caller is informed of errors.
+#include "log.h"
+#endif // USE_EXCEPTIONS
+
+namespace LibMatrix
+{
+// Proxy class for providing the functionality of a doubly-dimensioned array
+// representation of matrices.  Each matrix class defines its operator[]
+// to return an ArrayProxy.  The ArrayProxy then returns the appropriate item
+// from its operator[].
+template<typename T, unsigned int dimension>
+class ArrayProxy
+{
+public:
+    ArrayProxy(T* data) { data_ = data; }
+    ~ArrayProxy() { data_ = 0; }
+    T& operator[](int index)
+    {
+        return data_[index * dimension];
+    }
+    const T& operator[](int index) const
+    {
+        return data_[index * dimension];
+    }
+private:
+    T* data_;
+};
+
+
+// Programming interfaces to all matrix objects are represented row-centric 
+// (i.e. C/C++ style references to the data appear as matrix[row][column]).  
+// However, the internal data representation is column-major, so when using 
+// the raw data access member to treat the data as a singly-dimensioned array,
+// it does not have to be transposed.
+//
+// A template class for creating, managing and operating on a 2x2 matrix
+// of any type you like (intended for built-in types, but as long as it 
+// supports the basic arithmetic and assignment operators, any type should
+// work).
+template<typename T>
+class tmat2
+{
+public:
+    tmat2()
+    {
+        setIdentity();
+    }
+    tmat2(const tmat2& m)
+    {
+        m_[0] = m.m_[0];
+        m_[1] = m.m_[1];
+        m_[2] = m.m_[2];
+        m_[3] = m.m_[3];
+    }
+    tmat2(const T& c0r0, const T& c0r1, const T& c1r0, const T& c1r1)
+    {
+        m_[0] = c0r0;
+        m_[1] = c0r1;
+        m_[2] = c1r0;
+        m_[3] = c1r1;
+    }
+    ~tmat2() {}
+
+    // Reset this to the identity matrix.
+    void setIdentity()
+    {
+        m_[0] = 1;
+        m_[1] = 0;
+        m_[2] = 0;
+        m_[3] = 1;
+    }
+
+    // Transpose this.  Return a reference to this.
+    tmat2& transpose()
+    {
+        T tmp_val = m_[1];
+        m_[1] = m_[2];
+        m_[2] = tmp_val;
+        return *this;
+    }
+
+    // Compute the determinant of this and return it.
+    T determinant()
+    {
+        return (m_[0] * m_[3]) - (m_[2] * m_[1]);
+    }
+
+    // Invert this.  Return a reference to this.
+    //
+    // NOTE: If this is non-invertible, we will
+    //       throw to avoid undefined behavior.
+    tmat2& inverse()
+#ifdef USE_EXCEPTIONS
+        throw(std::runtime_error)
+#endif // USE_EXCEPTIONS
+    {
+        T d(determinant());
+        if (d == static_cast<T>(0))
+        {
+#ifdef USE_EXCEPTIONS
+            throw std::runtime_error("Matrix is noninvertible!!!!");
+#else // !USE_EXCEPTIONS
+            Log::error("Matrix is noninvertible!!!!\n");
+            return *this;
+#endif // USE_EXCEPTIONS
+        }
+        T c0r0(m_[3] / d);
+        T c0r1(-m_[1] / d);
+        T c1r0(-m_[2] / d);
+        T c1r1(m_[0] / d);
+        m_[0] = c0r0;
+        m_[1] = c0r1;
+        m_[2] = c1r0;
+        m_[3] = c1r1;        
+        return *this;
+    }
+
+    // Print the elements of the matrix to standard out.
+    // Really only useful for debug and test.
+    void print() const
+    {
+        static const int precision(6);
+        // row 0
+        std::cout << "| ";
+        std::cout << std::fixed << std::showpoint << std::setprecision(precision) << m_[0];
+        std::cout << " ";
+        std::cout << std::fixed << std::showpoint << std::setprecision(precision) << m_[2];
+        std::cout << " |" << std::endl;
+        // row 1
+        std::cout << "| ";
+        std::cout << std::fixed << std::showpoint << std::setprecision(precision) << m_[1];
+        std::cout << " ";
+        std::cout << std::fixed << std::showpoint << std::setprecision(precision) << m_[3];
+        std::cout << " |" << std::endl;
+    }
+
+    // Allow raw data access for API calls and the like.
+    // For example, it is valid to pass a tmat2<float> into a call to
+    // the OpenGL command "glUniformMatrix2fv()".
+    operator const T*() const { return &m_[0];}
+
+    // Test if 'rhs' is equal to this.
+    bool operator==(const tmat2& rhs) const
+    {
+        return m_[0] == rhs.m_[0] &&
+               m_[1] == rhs.m_[1] &&
+               m_[2] == rhs.m_[2] &&
+               m_[3] == rhs.m_[3];
+    }
+
+    // Test if 'rhs' is not equal to this.
+    bool operator!=(const tmat2& rhs) const
+    {
+        return !(*this == rhs);
+    }
+
+    // A direct assignment of 'rhs' to this.  Return a reference to this.
+    tmat2& operator=(const tmat2& rhs)
+    {
+        if (this != &rhs)
+        {
+            m_[0] = rhs.m_[0];
+            m_[1] = rhs.m_[1];
+            m_[2] = rhs.m_[2];
+            m_[3] = rhs.m_[3];
+        }
+        return *this;
+    }
+
+    // Add another matrix to this.  Return a reference to this.
+    tmat2& operator+=(const tmat2& rhs)
+    {
+        m_[0] += rhs.m_[0];
+        m_[1] += rhs.m_[1];
+        m_[2] += rhs.m_[2];
+        m_[3] += rhs.m_[3];
+        return *this;
+    }
+
+    // Add another matrix to a copy of this.  Return the copy.
+    const tmat2 operator+(const tmat2& rhs)
+    {
+        return tmat2(*this) += rhs;
+    }
+
+    // Subtract another matrix from this.  Return a reference to this.
+    tmat2& operator-=(const tmat2& rhs)
+    {
+        m_[0] -= rhs.m_[0];
+        m_[1] -= rhs.m_[1];
+        m_[2] -= rhs.m_[2];
+        m_[3] -= rhs.m_[3];
+        return *this;
+    }
+
+    // Subtract another matrix from a copy of this.  Return the copy.
+    const tmat2 operator-(const tmat2& rhs)
+    {
+        return tmat2(*this) += rhs;
+    }
+
+    // Multiply this by another matrix.  Return a reference to this.
+    tmat2& operator*=(const tmat2& rhs)
+    {
+        T c0r0((m_[0] * rhs.m_[0]) + (m_[2] * rhs.m_[1]));
+        T c0r1((m_[1] * rhs.m_[0]) + (m_[3] * rhs.m_[1]));
+        T c1r0((m_[0] * rhs.m_[2]) + (m_[2] * rhs.m_[3]));
+        T c1r1((m_[1] * rhs.m_[2]) + (m_[3] * rhs.m_[3]));
+        m_[0] = c0r0;
+        m_[1] = c0r1;
+        m_[2] = c1r0;
+        m_[3] = c1r1;
+        return *this;
+    }
+
+    // Multiply a copy of this by another matrix.  Return the copy.
+    const tmat2 operator*(const tmat2& rhs)
+    {
+        return tmat2(*this) *= rhs;
+    }
+
+    // Multiply this by a scalar.  Return a reference to this.
+    tmat2& operator*=(const T& rhs)
+    {
+        m_[0] *= rhs;
+        m_[1] *= rhs;
+        m_[2] *= rhs;
+        m_[3] *= rhs;
+        return *this;
+    }
+
+    // Multiply a copy of this by a scalar.  Return the copy.
+    const tmat2 operator*(const T& rhs)
+    {
+        return tmat2(*this) *= rhs;
+    }
+
+    // Divide this by a scalar.  Return a reference to this.
+    tmat2& operator/=(const T& rhs)
+    {
+        m_[0] /= rhs;
+        m_[1] /= rhs;
+        m_[2] /= rhs;
+        m_[3] /= rhs;
+        return *this;
+    }
+
+    // Divide a copy of this by a scalar.  Return the copy.
+    const tmat2 operator/(const T& rhs)
+    {
+        return tmat2(*this) /= rhs;
+    }
+
+    // Use an instance of the ArrayProxy class to support double-indexed
+    // references to a matrix (i.e., m[1][1]).  See comments above the
+    // ArrayProxy definition for more details.
+    ArrayProxy<T, 2> operator[](int index)
+    {
+        return ArrayProxy<T, 2>(&m_[index]);
+    }
+    const ArrayProxy<T, 2> operator[](int index) const
+    {
+        return ArrayProxy<T, 2>(const_cast<T*>(&m_[index]));
+    }
+
+private:
+    T m_[4];
+};
+
+// Multiply a scalar and a matrix just like the member operator, but allow
+// the scalar to be the left-hand operand.
+template<typename T>
+const tmat2<T> operator*(const T& lhs, const tmat2<T>& rhs)
+{
+    return tmat2<T>(rhs) * lhs;
+}
+
+// Multiply a copy of a vector and a matrix (matrix is right-hand operand).
+// Return the copy.
+template<typename T>
+const tvec2<T> operator*(const tvec2<T>& lhs, const tmat2<T>& rhs)
+{
+    T x((lhs.x() * rhs[0][0]) + (lhs.y() * rhs[1][0]));
+    T y((lhs.x() * rhs[0][1]) + (lhs.y() * rhs[1][1]));
+    return tvec2<T>(x,y);
+}
+
+// Multiply a copy of a vector and a matrix (matrix is left-hand operand).
+// Return the copy.
+template<typename T>
+const tvec2<T> operator*(const tmat2<T>& lhs, const tvec2<T>& rhs)
+{
+    T x((lhs[0][0] * rhs.x()) + (lhs[0][1] * rhs.y()));
+    T y((lhs[1][0] * rhs.x()) + (lhs[1][1] * rhs.y()));
+    return tvec2<T>(x, y);
+}
+
+// Compute the outer product of two vectors.  Return the resultant matrix.
+template<typename T>
+const tmat2<T> outer(const tvec2<T>& a, const tvec2<T>& b)
+{
+    tmat2<T> product;
+    product[0][0] = a.x() * b.x();
+    product[0][1] = a.x() * b.y();
+    product[1][0] = a.y() * b.x();
+    product[1][1] = a.y() * b.y();
+    return product;
+}
+
+// A template class for creating, managing and operating on a 3x3 matrix
+// of any type you like (intended for built-in types, but as long as it 
+// supports the basic arithmetic and assignment operators, any type should
+// work).
+template<typename T>
+class tmat3
+{
+public:
+    tmat3()
+    {
+        setIdentity();
+    }
+    tmat3(const tmat3& m)
+    {
+        m_[0] = m.m_[0];
+        m_[1] = m.m_[1];
+        m_[2] = m.m_[2];
+        m_[3] = m.m_[3];
+        m_[4] = m.m_[4];
+        m_[5] = m.m_[5];
+        m_[6] = m.m_[6];
+        m_[7] = m.m_[7];
+        m_[8] = m.m_[8];
+    }
+    tmat3(const T& c0r0, const T& c0r1, const T& c0r2,
+          const T& c1r0, const T& c1r1, const T& c1r2,
+          const T& c2r0, const T& c2r1, const T& c2r2)
+    {
+        m_[0] = c0r0;
+        m_[1] = c0r1;
+        m_[2] = c0r2;
+        m_[3] = c1r0;
+        m_[4] = c1r1;
+        m_[5] = c1r2;
+        m_[6] = c2r0;
+        m_[7] = c2r1;
+        m_[8] = c2r2;
+    }
+    ~tmat3() {}
+
+    // Reset this to the identity matrix.
+    void setIdentity()
+    {
+        m_[0] = 1;
+        m_[1] = 0;
+        m_[2] = 0;
+        m_[3] = 0;
+        m_[4] = 1;
+        m_[5] = 0;
+        m_[6] = 0;
+        m_[7] = 0;
+        m_[8] = 1;
+    }
+
+    // Transpose this.  Return a reference to this.
+    tmat3& transpose()
+    {
+        T tmp_val = m_[1];
+        m_[1] = m_[3];
+        m_[3] = tmp_val;
+        tmp_val = m_[2];
+        m_[2] = m_[6];
+        m_[6] = tmp_val;
+        tmp_val = m_[5];
+        m_[5] = m_[7];
+        m_[7] = tmp_val;
+        return *this;
+    }
+
+    // Compute the determinant of this and return it.
+    T determinant()
+    {
+        tmat2<T> minor0(m_[4], m_[5], m_[7], m_[8]);
+        tmat2<T> minor3(m_[1], m_[2], m_[7], m_[8]);
+        tmat2<T> minor6(m_[1], m_[2], m_[4], m_[5]);
+        return (m_[0] * minor0.determinant()) - 
+               (m_[3] * minor3.determinant()) +
+               (m_[6] * minor6.determinant());
+    }
+
+    // Invert this.  Return a reference to this.
+    //
+    // NOTE: If this is non-invertible, we will
+    //       throw to avoid undefined behavior.
+    tmat3& inverse()
+#ifdef USE_EXCEPTIONS
+        throw(std::runtime_error)
+#endif // USE_EXCEPTIONS
+    {
+        T d(determinant());
+        if (d == static_cast<T>(0))
+        {
+#ifdef USE_EXCEPTIONS
+            throw std::runtime_error("Matrix is noninvertible!!!!");
+#else // !USE_EXCEPTIONS
+            Log::error("Matrix is noninvertible!!!!\n");
+            return *this;
+#endif // USE_EXCEPTIONS
+        }
+        tmat2<T> minor0(m_[4], m_[5], m_[7], m_[8]);
+        tmat2<T> minor1(m_[7], m_[8], m_[1], m_[2]);
+        tmat2<T> minor2(m_[1], m_[2], m_[4], m_[5]);
+        tmat2<T> minor3(m_[6], m_[8], m_[3], m_[5]);
+        tmat2<T> minor4(m_[0], m_[2], m_[6], m_[8]);
+        tmat2<T> minor5(m_[3], m_[5], m_[0], m_[2]);
+        tmat2<T> minor6(m_[3], m_[4], m_[6], m_[7]);
+        tmat2<T> minor7(m_[6], m_[7], m_[0], m_[1]);
+        tmat2<T> minor8(m_[0], m_[1], m_[3], m_[4]);
+        m_[0] = minor0.determinant() / d;
+        m_[1] = minor1.determinant() / d;
+        m_[2] = minor2.determinant() / d;
+        m_[3] = minor3.determinant() / d;
+        m_[4] = minor4.determinant() / d;
+        m_[5] = minor5.determinant() / d;
+        m_[6] = minor6.determinant() / d;
+        m_[7] = minor7.determinant() / d;
+        m_[8] = minor8.determinant() / d;
+        return *this;       
+    }
+
+    // Print the elements of the matrix to standard out.
+    // Really only useful for debug and test.
+    void print() const
+    {
+        static const int precision(6);
+        // row 0
+        std::cout << "| ";
+        std::cout << std::fixed << std::showpoint << std::setprecision(precision) << m_[0];
+        std::cout << " ";
+        std::cout << std::fixed << std::showpoint << std::setprecision(precision) << m_[3];
+        std::cout << " ";
+        std::cout << std::fixed << std::showpoint << std::setprecision(precision) << m_[6];
+        std::cout << " |" << std::endl;
+        // row 1
+        std::cout << "| ";
+        std::cout << std::fixed << std::showpoint << std::setprecision(precision) << m_[1];
+        std::cout << " ";
+        std::cout << std::fixed << std::showpoint << std::setprecision(precision) << m_[4];
+        std::cout << " ";
+        std::cout << std::fixed << std::showpoint << std::setprecision(precision) << m_[7];
+        std::cout << " |" << std::endl;
+        // row 2
+        std::cout << "| ";
+        std::cout << std::fixed << std::showpoint << std::setprecision(precision) << m_[2];
+        std::cout << " ";
+        std::cout << std::fixed << std::showpoint << std::setprecision(precision) << m_[5];
+        std::cout << " ";
+        std::cout << std::fixed << std::showpoint << std::setprecision(precision) << m_[8];
+        std::cout << " |" << std::endl;
+    }
+
+    // Allow raw data access for API calls and the like.
+    // For example, it is valid to pass a tmat3<float> into a call to
+    // the OpenGL command "glUniformMatrix3fv()".
+    operator const T*() const { return &m_[0];}
+
+    // Test if 'rhs' is equal to this.
+    bool operator==(const tmat3& rhs) const
+    {
+        return m_[0] == rhs.m_[0] &&
+               m_[1] == rhs.m_[1] &&
+               m_[2] == rhs.m_[2] &&
+               m_[3] == rhs.m_[3] &&
+               m_[4] == rhs.m_[4] &&
+               m_[5] == rhs.m_[5] &&
+               m_[6] == rhs.m_[6] &&
+               m_[7] == rhs.m_[7] &&
+               m_[8] == rhs.m_[8];
+    }
+
+    // Test if 'rhs' is not equal to this.
+    bool operator!=(const tmat3& rhs) const
+    {
+        return !(*this == rhs);
+    }
+
+    // A direct assignment of 'rhs' to this.  Return a reference to this.
+    tmat3& operator=(const tmat3& rhs)
+    {
+        if (this != &rhs)
+        {
+            m_[0] = rhs.m_[0];
+            m_[1] = rhs.m_[1];
+            m_[2] = rhs.m_[2];
+            m_[3] = rhs.m_[3];
+            m_[4] = rhs.m_[4];
+            m_[5] = rhs.m_[5];
+            m_[6] = rhs.m_[6];
+            m_[7] = rhs.m_[7];
+            m_[8] = rhs.m_[8];
+        }
+        return *this;
+    }
+
+    // Add another matrix to this.  Return a reference to this.
+    tmat3& operator+=(const tmat3& rhs)
+    {
+        m_[0] += rhs.m_[0];
+        m_[1] += rhs.m_[1];
+        m_[2] += rhs.m_[2];
+        m_[3] += rhs.m_[3];
+        m_[4] += rhs.m_[4];
+        m_[5] += rhs.m_[5];
+        m_[6] += rhs.m_[6];
+        m_[7] += rhs.m_[7];
+        m_[8] += rhs.m_[8];
+        return *this;
+    }
+
+    // Add another matrix to a copy of this.  Return the copy.
+    const tmat3 operator+(const tmat3& rhs)
+    {
+        return tmat3(*this) += rhs;
+    }
+
+    // Subtract another matrix from this.  Return a reference to this.
+    tmat3& operator-=(const tmat3& rhs)
+    {
+        m_[0] -= rhs.m_[0];
+        m_[1] -= rhs.m_[1];
+        m_[2] -= rhs.m_[2];
+        m_[3] -= rhs.m_[3];
+        m_[4] -= rhs.m_[4];
+        m_[5] -= rhs.m_[5];
+        m_[6] -= rhs.m_[6];
+        m_[7] -= rhs.m_[7];
+        m_[8] -= rhs.m_[8];
+        return *this;
+    }
+
+    // Subtract another matrix from a copy of this.  Return the copy.
+    const tmat3 operator-(const tmat3& rhs)
+    {
+        return tmat3(*this) -= rhs;
+    }
+
+    // Multiply this by another matrix.  Return a reference to this.
+    tmat3& operator*=(const tmat3& rhs)
+    {
+        T c0r0((m_[0] * rhs.m_[0]) + (m_[3] * rhs.m_[1]) + (m_[6] * rhs.m_[2]));
+        T c0r1((m_[1] * rhs.m_[0]) + (m_[4] * rhs.m_[1]) + (m_[7] * rhs.m_[2]));
+        T c0r2((m_[2] * rhs.m_[0]) + (m_[5] * rhs.m_[1]) + (m_[8] * rhs.m_[2]));
+        T c1r0((m_[0] * rhs.m_[3]) + (m_[3] * rhs.m_[4]) + (m_[6] * rhs.m_[5]));
+        T c1r1((m_[1] * rhs.m_[3]) + (m_[4] * rhs.m_[4]) + (m_[7] * rhs.m_[5]));
+        T c1r2((m_[2] * rhs.m_[3]) + (m_[5] * rhs.m_[4]) + (m_[8] * rhs.m_[5]));
+        T c2r0((m_[0] * rhs.m_[6]) + (m_[3] * rhs.m_[7]) + (m_[6] * rhs.m_[8]));
+        T c2r1((m_[1] * rhs.m_[6]) + (m_[4] * rhs.m_[7]) + (m_[7] * rhs.m_[8]));
+        T c2r2((m_[2] * rhs.m_[6]) + (m_[5] * rhs.m_[7]) + (m_[8] * rhs.m_[8]));
+        m_[0] = c0r0;
+        m_[1] = c0r1;
+        m_[2] = c0r2;
+        m_[3] = c1r0;
+        m_[4] = c1r1;
+        m_[5] = c1r2;
+        m_[6] = c2r0;
+        m_[7] = c2r1;
+        m_[8] = c2r2;
+        return *this;
+    }
+
+    // Multiply a copy of this by another matrix.  Return the copy.
+    const tmat3 operator*(const tmat3& rhs)
+    {
+        return tmat3(*this) *= rhs;
+    }
+
+    // Multiply this by a scalar.  Return a reference to this.
+    tmat3& operator*=(const T& rhs)
+    {
+        m_[0] *= rhs;
+        m_[1] *= rhs;
+        m_[2] *= rhs;
+        m_[3] *= rhs;
+        m_[4] *= rhs;
+        m_[5] *= rhs;
+        m_[6] *= rhs;
+        m_[7] *= rhs;
+        m_[8] *= rhs;
+        return *this;
+    }
+
+    // Multiply a copy of this by a scalar.  Return the copy.
+    const tmat3 operator*(const T& rhs)
+    {
+        return tmat3(*this) *= rhs;
+    }
+
+    // Divide this by a scalar.  Return a reference to this.
+    tmat3& operator/=(const T& rhs)
+    {
+        m_[0] /= rhs;
+        m_[1] /= rhs;
+        m_[2] /= rhs;
+        m_[3] /= rhs;
+        m_[4] /= rhs;
+        m_[5] /= rhs;
+        m_[6] /= rhs;
+        m_[7] /= rhs;
+        m_[8] /= rhs;
+        return *this;
+    }
+
+    // Divide a copy of this by a scalar.  Return the copy.
+    const tmat3 operator/(const T& rhs)
+    {
+        return tmat3(*this) /= rhs;
+    }
+
+    // Use an instance of the ArrayProxy class to support double-indexed
+    // references to a matrix (i.e., m[1][1]).  See comments above the
+    // ArrayProxy definition for more details.
+    ArrayProxy<T, 3> operator[](int index)
+    {
+        return ArrayProxy<T, 3>(&m_[index]);
+    }
+    const ArrayProxy<T, 3> operator[](int index) const
+    {
+        return ArrayProxy<T, 3>(const_cast<T*>(&m_[index]));
+    }
+
+private:
+    T m_[9];
+};
+
+// Multiply a scalar and a matrix just like the member operator, but allow
+// the scalar to be the left-hand operand.
+template<typename T>
+const tmat3<T> operator*(const T& lhs, const tmat3<T>& rhs)
+{
+    return tmat3<T>(rhs) * lhs;
+}
+
+// Multiply a copy of a vector and a matrix (matrix is right-hand operand).
+// Return the copy.
+template<typename T>
+const tvec3<T> operator*(const tvec3<T>& lhs, const tmat3<T>& rhs)
+{
+    T x((lhs.x() * rhs[0][0]) + (lhs.y() * rhs[1][0]) + (lhs.z() * rhs[2][0]));
+    T y((lhs.x() * rhs[0][1]) + (lhs.y() * rhs[1][1]) + (lhs.z() * rhs[2][1]));
+    T z((lhs.x() * rhs[0][2]) + (lhs.y() * rhs[1][2]) + (lhs.z() * rhs[2][2]));
+    return tvec3<T>(x, y, z);
+}
+
+// Multiply a copy of a vector and a matrix (matrix is left-hand operand).
+// Return the copy.
+template<typename T>
+const tvec3<T> operator*(const tmat3<T>& lhs, const tvec3<T>& rhs)
+{
+    T x((lhs[0][0] * rhs.x()) + (lhs[0][1] * rhs.y()) + (lhs[0][2] * rhs.z()));
+    T y((lhs[1][0] * rhs.x()) + (lhs[1][1] * rhs.y()) + (lhs[1][2] * rhs.z()));
+    T z((lhs[2][0] * rhs.x()) + (lhs[2][1] * rhs.y()) + (lhs[2][2] * rhs.z()));
+    return tvec3<T>(x, y, z);
+}
+
+// Compute the outer product of two vectors.  Return the resultant matrix.
+template<typename T>
+const tmat3<T> outer(const tvec3<T>& a, const tvec3<T>& b)
+{
+    tmat3<T> product;
+    product[0][0] = a.x() * b.x();
+    product[0][1] = a.x() * b.y();
+    product[0][2] = a.x() * b.z();
+    product[1][0] = a.y() * b.x();
+    product[1][1] = a.y() * b.y();
+    product[1][2] = a.y() * b.z();
+    product[2][0] = a.z() * b.x();
+    product[2][1] = a.z() * b.y();
+    product[2][2] = a.z() * b.z();
+    return product;
+}
+
+// A template class for creating, managing and operating on a 4x4 matrix
+// of any type you like (intended for built-in types, but as long as it 
+// supports the basic arithmetic and assignment operators, any type should
+// work).
+template<typename T>
+class tmat4
+{
+public:
+    tmat4()
+    {
+        setIdentity();
+    }
+    tmat4(const tmat4& m)
+    {
+        m_[0] = m.m_[0];
+        m_[1] = m.m_[1];
+        m_[2] = m.m_[2];
+        m_[3] = m.m_[3];
+        m_[4] = m.m_[4];
+        m_[5] = m.m_[5];
+        m_[6] = m.m_[6];
+        m_[7] = m.m_[7];
+        m_[8] = m.m_[8];
+        m_[9] = m.m_[9];
+        m_[10] = m.m_[10];
+        m_[11] = m.m_[11];
+        m_[12] = m.m_[12];
+        m_[13] = m.m_[13];
+        m_[14] = m.m_[14];
+        m_[15] = m.m_[15];
+    }
+    ~tmat4() {}
+
+    // Reset this to the identity matrix.
+    void setIdentity()
+    {
+        m_[0] = 1;
+        m_[1] = 0;
+        m_[2] = 0;
+        m_[3] = 0;
+        m_[4] = 0;
+        m_[5] = 1;
+        m_[6] = 0;
+        m_[7] = 0;
+        m_[8] = 0;
+        m_[9] = 0;
+        m_[10] = 1;
+        m_[11] = 0;
+        m_[12] = 0;
+        m_[13] = 0;
+        m_[14] = 0;
+        m_[15] = 1;
+    }
+
+    // Transpose this.  Return a reference to this.
+    tmat4& transpose()
+    {
+        T tmp_val = m_[1];
+        m_[1] = m_[4];
+        m_[4] = tmp_val;
+        tmp_val = m_[2];
+        m_[2] = m_[8];
+        m_[8] = tmp_val;
+        tmp_val = m_[3];
+        m_[3] = m_[12];
+        m_[12] = tmp_val;
+        tmp_val = m_[6];
+        m_[6] = m_[9];
+        m_[9] = tmp_val;
+        tmp_val = m_[7];
+        m_[7] = m_[13];
+        m_[13] = tmp_val;
+        tmp_val = m_[11];
+        m_[11] = m_[14];
+        m_[14] = tmp_val;
+        return *this;
+    }
+
+    // Compute the determinant of this and return it.
+    T determinant()
+    {
+        tmat3<T> minor0(m_[5], m_[6], m_[7], m_[9], m_[10], m_[11], m_[13], m_[14], m_[15]);
+        tmat3<T> minor4(m_[1], m_[2], m_[3], m_[9], m_[10], m_[11], m_[13], m_[14], m_[15]);
+        tmat3<T> minor8(m_[1], m_[2], m_[3], m_[5], m_[6], m_[7], m_[13], m_[14], m_[15]);
+        tmat3<T> minor12(m_[1], m_[2], m_[3], m_[5], m_[6], m_[7], m_[9], m_[10], m_[11]);
+        return (m_[0] * minor0.determinant()) -
+               (m_[4] * minor4.determinant()) +
+               (m_[8] * minor8.determinant()) -
+               (m_[12] * minor12.determinant());
+    }
+
+    // Invert this.  Return a reference to this.
+    //
+    // NOTE: If this is non-invertible, we will
+    //       throw to avoid undefined behavior.
+    tmat4& inverse()
+#ifdef USE_EXCEPTIONS
+        throw(std::runtime_error)
+#endif // USE_EXCEPTIONS
+    {
+        T d(determinant());
+        if (d == static_cast<T>(0))
+        {
+#ifdef USE_EXCEPTIONS
+            throw std::runtime_error("Matrix is noninvertible!!!!");
+#else // !USE_EXCEPTIONS
+            Log::error("Matrix is noninvertible!!!!\n");
+            return *this;
+#endif // USE_EXCEPTIONS
+        }
+        tmat3<T> minor0(m_[5], m_[6], m_[7], m_[9], m_[10], m_[11], m_[13], m_[14], m_[15]);
+        tmat3<T> minor1(m_[1], m_[2], m_[3], m_[13], m_[14], m_[15], m_[9], m_[10], m_[11]);
+        tmat3<T> minor2(m_[1], m_[2], m_[3], m_[5], m_[6], m_[7], m_[13], m_[14], m_[15]);
+        tmat3<T> minor3(m_[1], m_[2], m_[3], m_[9], m_[10], m_[11], m_[5], m_[6], m_[7]);
+
+        tmat3<T> minor4(m_[4], m_[6], m_[7], m_[12], m_[14], m_[15], m_[8], m_[10], m_[11]);
+        tmat3<T> minor5(m_[0], m_[2], m_[3], m_[8], m_[10], m_[11], m_[12], m_[14], m_[15]);
+        tmat3<T> minor6(m_[0], m_[2], m_[3], m_[12], m_[14], m_[15], m_[4], m_[6], m_[7]);
+        tmat3<T> minor7(m_[0], m_[2], m_[3], m_[4], m_[6], m_[7], m_[8], m_[10], m_[11]);
+
+        tmat3<T> minor8(m_[4], m_[5], m_[7], m_[8], m_[9], m_[11], m_[12], m_[13], m_[15]);
+        tmat3<T> minor9(m_[0], m_[1], m_[3], m_[12], m_[13], m_[15], m_[8], m_[9], m_[11]);
+        tmat3<T> minor10(m_[0], m_[1], m_[3], m_[4], m_[5], m_[7], m_[12], m_[13], m_[15]);
+        tmat3<T> minor11(m_[0], m_[1], m_[3], m_[8], m_[9], m_[11], m_[4], m_[5], m_[7]);
+
+        tmat3<T> minor12(m_[4], m_[5], m_[6], m_[12], m_[13], m_[14], m_[8], m_[9], m_[10]);
+        tmat3<T> minor13(m_[0], m_[1], m_[2], m_[8], m_[9], m_[10], m_[12], m_[13], m_[14]);
+        tmat3<T> minor14(m_[0], m_[1], m_[2], m_[12], m_[13], m_[14], m_[4], m_[5], m_[6]);
+        tmat3<T> minor15(m_[0], m_[1], m_[2], m_[4], m_[5], m_[6], m_[8], m_[9], m_[10]);
+        m_[0] = minor0.determinant() / d;
+        m_[1] = minor1.determinant() / d;
+        m_[2] = minor2.determinant() / d;
+        m_[3] = minor3.determinant() / d;
+        m_[4] = minor4.determinant() / d;
+        m_[5] = minor5.determinant() / d;
+        m_[6] = minor6.determinant() / d;
+        m_[7] = minor7.determinant() / d;
+        m_[8] = minor8.determinant() / d;
+        m_[9] = minor9.determinant() / d;
+        m_[10] = minor10.determinant() / d;
+        m_[11] = minor11.determinant() / d;
+        m_[12] = minor12.determinant() / d;
+        m_[13] = minor13.determinant() / d;
+        m_[14] = minor14.determinant() / d;
+        m_[15] = minor15.determinant() / d;
+        return *this;
+    }
+
+    // Print the elements of the matrix to standard out.
+    // Really only useful for debug and test.
+    void print() const
+    {
+        static const int precision(6);
+        // row 0
+        std::cout << "| ";
+        std::cout << std::fixed << std::showpoint << std::setprecision(precision) << m_[0];
+        std::cout << " ";
+        std::cout << std::fixed << std::showpoint << std::setprecision(precision) << m_[4];
+        std::cout << " ";
+        std::cout << std::fixed << std::showpoint << std::setprecision(precision) << m_[8];
+        std::cout << " ";
+        std::cout << std::fixed << std::showpoint << std::setprecision(precision) << m_[12];
+        std::cout << " |" << std::endl;
+        // row 1
+        std::cout << "| ";
+        std::cout << std::fixed << std::showpoint << std::setprecision(precision) << m_[1];
+        std::cout << " ";
+        std::cout << std::fixed << std::showpoint << std::setprecision(precision) << m_[5];
+        std::cout << " ";
+        std::cout << std::fixed << std::showpoint << std::setprecision(precision) << m_[9];
+        std::cout << " ";
+        std::cout << std::fixed << std::showpoint << std::setprecision(precision) << m_[13];
+        std::cout << " |" << std::endl;
+        // row 2
+        std::cout << "| ";
+        std::cout << std::fixed << std::showpoint << std::setprecision(precision) << m_[2];
+        std::cout << " ";
+        std::cout << std::fixed << std::showpoint << std::setprecision(precision) << m_[6];
+        std::cout << " ";
+        std::cout << std::fixed << std::showpoint << std::setprecision(precision) << m_[10];
+        std::cout << " ";
+        std::cout << std::fixed << std::showpoint << std::setprecision(precision) << m_[14];
+        std::cout << " |" << std::endl;
+        // row 3
+        std::cout << "| ";
+        std::cout << std::fixed << std::showpoint << std::setprecision(precision) << m_[3];
+        std::cout << " ";
+        std::cout << std::fixed << std::showpoint << std::setprecision(precision) << m_[7];
+        std::cout << " ";
+        std::cout << std::fixed << std::showpoint << std::setprecision(precision) << m_[11];
+        std::cout << " ";
+        std::cout << std::fixed << std::showpoint << std::setprecision(precision) << m_[15];
+        std::cout << " |" << std::endl;
+    }
+
+    // Allow raw data access for API calls and the like.
+    // For example, it is valid to pass a tmat4<float> into a call to
+    // the OpenGL command "glUniformMatrix4fv()".
+    operator const T*() const { return &m_[0];}
+
+    // Test if 'rhs' is equal to this.
+    bool operator==(const tmat4& rhs) const
+    {
+        return m_[0] == rhs.m_[0] &&
+               m_[1] == rhs.m_[1] &&
+               m_[2] == rhs.m_[2] &&
+               m_[3] == rhs.m_[3] &&
+               m_[4] == rhs.m_[4] &&
+               m_[5] == rhs.m_[5] &&
+               m_[6] == rhs.m_[6] &&
+               m_[7] == rhs.m_[7] &&
+               m_[8] == rhs.m_[8] &&
+               m_[9] == rhs.m_[9] &&
+               m_[10] == rhs.m_[10] &&
+               m_[11] == rhs.m_[11] &&
+               m_[12] == rhs.m_[12] &&
+               m_[13] == rhs.m_[13] &&
+               m_[14] == rhs.m_[14] &&
+               m_[15] == rhs.m_[15];
+    }
+
+    // Test if 'rhs' is not equal to this.
+    bool operator!=(const tmat4& rhs) const
+    {
+        return !(*this == rhs);
+    }
+
+    // A direct assignment of 'rhs' to this.  Return a reference to this.
+    tmat4& operator=(const tmat4& rhs)
+    {
+        if (this != &rhs)
+        {
+            m_[0] = rhs.m_[0];
+            m_[1] = rhs.m_[1];
+            m_[2] = rhs.m_[2];
+            m_[3] = rhs.m_[3];
+            m_[4] = rhs.m_[4];
+            m_[5] = rhs.m_[5];
+            m_[6] = rhs.m_[6];
+            m_[7] = rhs.m_[7];
+            m_[8] = rhs.m_[8];
+            m_[9] = rhs.m_[9];
+            m_[10] = rhs.m_[10];
+            m_[11] = rhs.m_[11];
+            m_[12] = rhs.m_[12];
+            m_[13] = rhs.m_[13];
+            m_[14] = rhs.m_[14];
+            m_[15] = rhs.m_[15];
+        }
+        return *this;
+    }
+
+    // Add another matrix to this.  Return a reference to this.
+    tmat4& operator+=(const tmat4& rhs)
+    {
+        m_[0] += rhs.m_[0];
+        m_[1] += rhs.m_[1];
+        m_[2] += rhs.m_[2];
+        m_[3] += rhs.m_[3];
+        m_[4] += rhs.m_[4];
+        m_[5] += rhs.m_[5];
+        m_[6] += rhs.m_[6];
+        m_[7] += rhs.m_[7];
+        m_[8] += rhs.m_[8];
+        m_[9] += rhs.m_[9];
+        m_[10] += rhs.m_[10];
+        m_[11] += rhs.m_[11];
+        m_[12] += rhs.m_[12];
+        m_[13] += rhs.m_[13];
+        m_[14] += rhs.m_[14];
+        m_[15] += rhs.m_[15];
+        return *this;
+    }
+
+    // Add another matrix to a copy of this.  Return the copy.
+    const tmat4 operator+(const tmat4& rhs)
+    {
+        return tmat4(*this) += rhs;
+    }
+
+    // Subtract another matrix from this.  Return a reference to this.
+    tmat4& operator-=(const tmat4& rhs)
+    {
+        m_[0] -= rhs.m_[0];
+        m_[1] -= rhs.m_[1];
+        m_[2] -= rhs.m_[2];
+        m_[3] -= rhs.m_[3];
+        m_[4] -= rhs.m_[4];
+        m_[5] -= rhs.m_[5];
+        m_[6] -= rhs.m_[6];
+        m_[7] -= rhs.m_[7];
+        m_[8] -= rhs.m_[8];
+        m_[9] -= rhs.m_[9];
+        m_[10] -= rhs.m_[10];
+        m_[11] -= rhs.m_[11];
+        m_[12] -= rhs.m_[12];
+        m_[13] -= rhs.m_[13];
+        m_[14] -= rhs.m_[14];
+        m_[15] -= rhs.m_[15];
+        return *this;
+    }
+
+    // Subtract another matrix from a copy of this.  Return the copy.
+    const tmat4 operator-(const tmat4& rhs)
+    {
+        return tmat4(*this) -= rhs;
+    }
+
+    // Multiply this by another matrix.  Return a reference to this.
+    tmat4& operator*=(const tmat4& rhs)
+    {
+        T c0r0((m_[0] * rhs.m_[0]) + (m_[4] * rhs.m_[1]) + (m_[8] * rhs.m_[2]) + (m_[12] * rhs.m_[3]));
+        T c0r1((m_[1] * rhs.m_[0]) + (m_[5] * rhs.m_[1]) + (m_[9] * rhs.m_[2]) + (m_[13] * rhs.m_[3]));
+        T c0r2((m_[2] * rhs.m_[0]) + (m_[6] * rhs.m_[1]) + (m_[10] * rhs.m_[2]) + (m_[14] * rhs.m_[3]));
+        T c0r3((m_[3] * rhs.m_[0]) + (m_[7] * rhs.m_[1]) + (m_[11] * rhs.m_[2]) + (m_[15] * rhs.m_[3]));
+        T c1r0((m_[0] * rhs.m_[4]) + (m_[4] * rhs.m_[5]) + (m_[8] * rhs.m_[6]) + (m_[12] * rhs.m_[7]));
+        T c1r1((m_[1] * rhs.m_[4]) + (m_[5] * rhs.m_[5]) + (m_[9] * rhs.m_[6]) + (m_[13] * rhs.m_[7]));
+        T c1r2((m_[2] * rhs.m_[4]) + (m_[6] * rhs.m_[5]) + (m_[10] * rhs.m_[6]) + (m_[14] * rhs.m_[7]));
+        T c1r3((m_[3] * rhs.m_[4]) + (m_[7] * rhs.m_[5]) + (m_[11] * rhs.m_[6]) + (m_[15] * rhs.m_[7]));
+        T c2r0((m_[0] * rhs.m_[8]) + (m_[4] * rhs.m_[9]) + (m_[8] * rhs.m_[10]) + (m_[12] * rhs.m_[11]));
+        T c2r1((m_[1] * rhs.m_[8]) + (m_[5] * rhs.m_[9]) + (m_[9] * rhs.m_[10]) + (m_[13] * rhs.m_[11]));
+        T c2r2((m_[2] * rhs.m_[8]) + (m_[6] * rhs.m_[9]) + (m_[10] * rhs.m_[10]) + (m_[14] * rhs.m_[11]));
+        T c2r3((m_[3] * rhs.m_[8]) + (m_[7] * rhs.m_[9]) + (m_[11] * rhs.m_[10]) + (m_[15] * rhs.m_[11]));
+        T c3r0((m_[0] * rhs.m_[12]) + (m_[4] * rhs.m_[13]) + (m_[8] * rhs.m_[14]) + (m_[12] * rhs.m_[15]));
+        T c3r1((m_[1] * rhs.m_[12]) + (m_[5] * rhs.m_[13]) + (m_[9] * rhs.m_[14]) + (m_[13] * rhs.m_[15]));
+        T c3r2((m_[2] * rhs.m_[12]) + (m_[6] * rhs.m_[13]) + (m_[10] * rhs.m_[14]) + (m_[14] * rhs.m_[15]));
+        T c3r3((m_[3] * rhs.m_[12]) + (m_[7] * rhs.m_[13]) + (m_[11] * rhs.m_[14]) + (m_[15] * rhs.m_[15]));
+        m_[0] = c0r0;
+        m_[1] = c0r1;
+        m_[2] = c0r2;
+        m_[3] = c0r3;
+        m_[4] = c1r0;
+        m_[5] = c1r1;
+        m_[6] = c1r2;
+        m_[7] = c1r3;
+        m_[8] = c2r0;
+        m_[9] = c2r1;
+        m_[10] = c2r2;
+        m_[11] = c2r3;
+        m_[12] = c3r0;
+        m_[13] = c3r1;
+        m_[14] = c3r2;
+        m_[15] = c3r3;
+        return *this;
+    }
+
+    // Multiply a copy of this by another matrix.  Return the copy.
+    const tmat4 operator*(const tmat4& rhs)
+    {
+        return tmat4(*this) *= rhs;
+    }
+
+    // Multiply this by a scalar.  Return a reference to this.
+    tmat4& operator*=(const T& rhs)
+    {
+        m_[0] *= rhs;
+        m_[1] *= rhs;
+        m_[2] *= rhs;
+        m_[3] *= rhs;
+        m_[4] *= rhs;
+        m_[5] *= rhs;
+        m_[6] *= rhs;
+        m_[7] *= rhs;
+        m_[8] *= rhs;
+        m_[9] *= rhs;
+        m_[10] *= rhs;
+        m_[11] *= rhs;
+        m_[12] *= rhs;
+        m_[13] *= rhs;
+        m_[14] *= rhs;
+        m_[15] *= rhs;
+        return *this;
+    }
+
+    // Multiply a copy of this by a scalar.  Return the copy.
+    const tmat4 operator*(const T& rhs)
+    {
+        return tmat4(*this) *= rhs;
+    }
+
+    // Divide this by a scalar.  Return a reference to this.
+    tmat4& operator/=(const T& rhs)
+    {
+        m_[0] /= rhs;
+        m_[1] /= rhs;
+        m_[2] /= rhs;
+        m_[3] /= rhs;
+        m_[4] /= rhs;
+        m_[5] /= rhs;
+        m_[6] /= rhs;
+        m_[7] /= rhs;
+        m_[8] /= rhs;
+        m_[9] /= rhs;
+        m_[10] /= rhs;
+        m_[11] /= rhs;
+        m_[12] /= rhs;
+        m_[13] /= rhs;
+        m_[14] /= rhs;
+        m_[15] /= rhs;
+        return *this;
+    }
+
+    // Divide a copy of this by a scalar.  Return the copy.
+    const tmat4 operator/(const T& rhs)
+    {
+        return tmat4(*this) /= rhs;
+    }
+
+    // Use an instance of the ArrayProxy class to support double-indexed
+    // references to a matrix (i.e., m[1][1]).  See comments above the
+    // ArrayProxy definition for more details.
+    ArrayProxy<T, 4> operator[](int index)
+    {
+        return ArrayProxy<T, 4>(&m_[index]);
+    }
+    const ArrayProxy<T, 4> operator[](int index) const
+    {
+        return ArrayProxy<T, 4>(const_cast<T*>(&m_[index]));
+    }
+
+private:
+    T m_[16];
+};
+
+// Multiply a scalar and a matrix just like the member operator, but allow
+// the scalar to be the left-hand operand.
+template<typename T>
+const tmat4<T> operator*(const T& lhs, const tmat4<T>& rhs)
+{
+    return tmat4<T>(rhs) * lhs;
+}
+
+// Multiply a copy of a vector and a matrix (matrix is right-hand operand).
+// Return the copy.
+template<typename T>
+const tvec4<T> operator*(const tvec4<T>& lhs, const tmat4<T>& rhs)
+{
+    T x((lhs.x() * rhs[0][0]) + (lhs.y() * rhs[1][0]) + (lhs.z() * rhs[2][0]) + (lhs.w() * rhs[3][0]));
+    T y((lhs.x() * rhs[0][1]) + (lhs.y() * rhs[1][1]) + (lhs.z() * rhs[2][1]) + (lhs.w() * rhs[3][1]));
+    T z((lhs.x() * rhs[0][2]) + (lhs.y() * rhs[1][2]) + (lhs.z() * rhs[2][2]) + (lhs.w() * rhs[3][2]));
+    T w((lhs.x() * rhs[0][3]) + (lhs.y() * rhs[1][3]) + (lhs.z() * rhs[2][3]) + (lhs.w() * rhs[3][3]));
+    return tvec4<T>(x, y, z, w);
+}
+
+// Multiply a copy of a vector and a matrix (matrix is left-hand operand).
+// Return the copy.
+template<typename T>
+const tvec4<T> operator*(const tmat4<T>& lhs, const tvec4<T>& rhs)
+{
+    T x((lhs[0][0] * rhs.x()) + (lhs[0][1] * rhs.y()) + (lhs[0][2] * rhs.z()) + (lhs[0][3] * rhs.w()));
+    T y((lhs[1][0] * rhs.x()) + (lhs[1][1] * rhs.y()) + (lhs[1][2] * rhs.z()) + (lhs[1][3] * rhs.w()));
+    T z((lhs[2][0] * rhs.x()) + (lhs[2][1] * rhs.y()) + (lhs[2][2] * rhs.z()) + (lhs[2][3] * rhs.w()));
+    T w((lhs[3][0] * rhs.x()) + (lhs[3][1] * rhs.y()) + (lhs[3][2] * rhs.z()) + (lhs[3][3] * rhs.w()));
+    return tvec4<T>(x, y, z, w);
+}
+
+// Compute the outer product of two vectors.  Return the resultant matrix.
+template<typename T>
+const tmat4<T> outer(const tvec4<T>& a, const tvec4<T>& b)
+{
+    tmat4<T> product;
+    product[0][0] = a.x() * b.x();
+    product[0][1] = a.x() * b.y();
+    product[0][2] = a.x() * b.z();
+    product[0][3] = a.x() * b.w();
+    product[1][0] = a.y() * b.x();
+    product[1][1] = a.y() * b.y();
+    product[1][2] = a.y() * b.z();
+    product[1][3] = a.y() * b.w();
+    product[2][0] = a.z() * b.x();
+    product[2][1] = a.z() * b.y();
+    product[2][2] = a.z() * b.z();
+    product[2][3] = a.z() * b.w();
+    product[3][0] = a.w() * b.x();
+    product[3][1] = a.w() * b.y();
+    product[3][2] = a.w() * b.z();
+    product[3][3] = a.w() * b.w();
+    return product;
+}
+
+//
+// Convenience typedefs.  These are here to present a homogeneous view of these
+// objects with respect to shader source.
+//
+typedef tmat2<float> mat2;
+typedef tmat3<float> mat3;
+typedef tmat4<float> mat4;
+
+typedef tmat2<double> dmat2;
+typedef tmat3<double> dmat3;
+typedef tmat4<double> dmat4;
+
+typedef tmat2<int> imat2;
+typedef tmat3<int> imat3;
+typedef tmat4<int> imat4;
+
+typedef tmat2<unsigned int> umat2;
+typedef tmat3<unsigned int> umat3;
+typedef tmat4<unsigned int> umat4;
+
+typedef tmat2<bool> bmat2;
+typedef tmat3<bool> bmat3;
+typedef tmat4<bool> bmat4;
+
+namespace Mat4
+{
+
+//
+// Some functions to generate transformation matrices that used to be provided
+// by OpenGL.
+//
+mat4 translate(float x, float y, float z);
+mat4 scale(float x, float y, float z);
+mat4 rotate(float angle, float x, float y, float z);
+mat4 frustum(float left, float right, float bottom, float top, float near, float far);
+mat4 ortho(float left, float right, float bottom, float top, float near, float far);
+mat4 perspective(float fovy, float aspect, float zNear, float zFar);
+mat4 lookAt(float eyeX, float eyeY, float eyeZ, float centerX, float centerY, float centerZ, float upX, float upY, float upZ);
+
+} // namespace Mat4
+} // namespace LibMatrix
+#endif // MAT_H_
diff --git a/src/libmatrix/program.cc b/src/libmatrix/program.cc
new file mode 100644
index 0000000..b27298b
--- /dev/null
+++ b/src/libmatrix/program.cc
@@ -0,0 +1,360 @@
+//
+// Copyright (c) 2011-2012 Linaro Limited
+//
+// All rights reserved. This program and the accompanying materials
+// are made available under the terms of the MIT License which accompanies
+// this distribution, and is available at
+// http://www.opensource.org/licenses/mit-license.php
+//
+// Contributors:
+//     Jesse Barker - original implementation.
+//
+#include <string>
+#include <vector>
+#include <sstream>
+#include <fstream>
+#include <iostream>
+#include "gl-if.h"
+#include "program.h"
+
+using std::string;
+using LibMatrix::mat4;
+using LibMatrix::mat3;
+using LibMatrix::vec2;
+using LibMatrix::vec3;
+using LibMatrix::vec4;
+
+Shader::Shader(unsigned int type, const string& source) :
+    handle_(0),
+    type_(type),
+    source_(source),
+    ready_(false),
+    valid_(false)
+{
+    // Create our shader and setup the source code.
+    handle_ = glCreateShader(type);
+    if (!handle_)
+    {
+        message_ = string("Failed to create the new shader.");
+        return;
+    }
+    const GLchar* shaderSource = source_.c_str();
+    glShaderSource(handle_, 1, &shaderSource, NULL);
+    GLint param = 0;
+    glGetShaderiv(handle_, GL_SHADER_SOURCE_LENGTH, &param);
+    if (static_cast<unsigned int>(param) != source_.length() + 1)
+    {
+        std::ostringstream o(string("Expected shader source length "));
+        o << source_.length() << ", but got " << param << std::endl;
+        message_ = o.str();
+        return;
+    }
+    valid_ = true;
+}
+
+Shader::~Shader()
+{
+    handle_ = 0;
+    type_ = 0;
+    ready_ = false;
+    valid_ = false;
+}
+
+void
+Shader::compile()
+{
+    // Make sure we have a good shader and haven't already compiled it.
+    if (!valid_ || ready_)
+    {
+        return;
+    }
+    glCompileShader(handle_);
+    GLint param = 0;
+    glGetShaderiv(handle_, GL_COMPILE_STATUS, &param);
+    if (param == GL_FALSE)
+    {
+        glGetShaderiv(handle_, GL_INFO_LOG_LENGTH, &param);
+        GLchar* infoLog = new GLchar[param + 1];
+        glGetShaderInfoLog(handle_, param + 1, NULL, infoLog);
+        message_ = infoLog;
+        delete [] infoLog;
+        return;
+    }
+    ready_ = true;
+}
+
+void
+Shader::attach(unsigned int program)
+{
+    // Shader must be valid and compiled to be attached to a program.
+    if (!valid_ || !ready_)
+    {
+        return;
+    }
+    glAttachShader(program, handle_);
+}
+
+void
+Shader::release()
+{
+    if (handle_)
+    {
+        glDeleteShader(handle_);
+    }
+    handle_ = 0;
+    type_ = 0;
+    ready_ = false;
+    valid_ = false;
+}
+
+Program::Program() :
+    handle_(0),
+    ready_(false),
+    valid_(false)
+{
+}
+
+Program::~Program()
+{
+    // First release all of the shader resources attached to us and clean up
+    // our handle.
+    release();
+}
+
+void
+Program::init()
+{
+    handle_ = glCreateProgram();
+    if (!handle_)
+    {
+        message_ = string("Failed to create the new program");
+        return;
+    }
+
+    valid_ = true;
+}
+
+void
+Program::release()
+{
+    // First delete all of the shader resources attached to us.
+    for (std::vector<Shader>::iterator shaderIt = shaders_.begin(); shaderIt != shaders_.end(); shaderIt++)
+    {
+        shaderIt->release();
+    }
+
+    // Clear out the shader vector so we're ready to reuse it.
+    shaders_.clear();
+
+    // Clear out the error string to make sure we don't return anything stale.
+    message_.clear();
+
+    // Release all of the symbol map resources.
+    for (std::map<string, Symbol*>::iterator symbolIt = symbols_.begin(); symbolIt != symbols_.end(); symbolIt++)
+    {
+        delete (*symbolIt).second;
+    }
+    symbols_.clear();
+
+    if (handle_)
+    {
+        glDeleteProgram(handle_);
+    }
+    handle_ = 0;
+    ready_ = false;
+    valid_ = false;
+}
+void
+Program::addShader(unsigned int type, const string& source)
+{
+    if (!valid_)
+    {
+        return;
+    }
+
+    Shader shader(type, source);
+    if (!shader.valid())
+    {
+        message_ = shader.errorMessage();
+        valid_ = false;
+        return;
+    }
+
+    shader.compile();
+
+    if (!shader.ready())
+    {
+        message_ = shader.errorMessage();
+        valid_ = false;
+        return;
+    }
+
+    shader.attach(handle_);
+    shaders_.push_back(shader);
+    return;
+}
+
+void
+Program::build()
+{
+    if (!valid_ || ready_)
+    {
+        return;
+    }
+
+    if (shaders_.empty())
+    {
+        message_ = string("There are no shaders attached to this program");
+        return;
+    }
+
+    glLinkProgram(handle_);
+    GLint param = 1;
+    glGetProgramiv(handle_, GL_LINK_STATUS, &param);
+    if (param == GL_FALSE)
+    {
+        glGetProgramiv(handle_, GL_INFO_LOG_LENGTH, &param);
+        GLchar* infoLog = new GLchar[param + 1];
+        glGetProgramInfoLog(handle_, param + 1, NULL, infoLog);
+        message_ = infoLog;
+        delete [] infoLog;
+        return;
+    }
+    ready_ = true;
+}
+
+void
+Program::start()
+{
+    if (!valid_ || !ready_)
+    {
+        return;
+    }
+    glUseProgram(handle_);
+}
+
+void
+Program::stop()
+{
+    glUseProgram(0);
+}
+
+
+int
+Program::getUniformLocation(const string& name)
+{
+    GLint location = glGetUniformLocation(handle_, name.c_str());
+    if (location < 0)
+    {
+        message_ = string("Failed to get uniform location for \"") + name +
+            string("\"");
+    }
+    return location;
+}
+
+int
+Program::getAttribIndex(const string& name)
+{
+    GLint index = glGetAttribLocation(handle_, name.c_str());
+    if (index < 0)
+    {
+        message_ = string("Failed to get attribute location for \"") + name +
+            string("\"");
+    }
+    return index;
+}
+
+Program::Symbol&
+Program::Symbol::operator=(const mat4& m)
+{
+    if (type_ == Uniform)
+    {
+        // Our matrix representation is column-major, so transpose is false here.
+        glUniformMatrix4fv(location_, 1, GL_FALSE, m);
+    }
+    return *this;
+}
+
+Program::Symbol&
+Program::Symbol::operator=(const mat3& m)
+{
+    if (type_ == Uniform)
+    {
+        // Our matrix representation is column-major, so transpose is false here.
+        glUniformMatrix3fv(location_, 1, GL_FALSE, m);
+    }
+    return *this;
+}
+
+Program::Symbol&
+Program::Symbol::operator=(const vec2& v)
+{
+    if (type_ == Uniform)
+    {
+        glUniform2fv(location_, 1, v);
+    }
+    return *this;
+}
+
+Program::Symbol&
+Program::Symbol::operator=(const vec3& v)
+{
+    if (type_ == Uniform)
+    {
+        glUniform3fv(location_, 1, v);
+    }
+    return *this;
+}
+
+Program::Symbol&
+Program::Symbol::operator=(const vec4& v)
+{
+    if (type_ == Uniform)
+    {
+        glUniform4fv(location_, 1, v);
+    }
+    return *this;
+}
+
+Program::Symbol&
+Program::Symbol::operator=(const float& f)
+{
+    if (type_ == Uniform)
+    {
+        glUniform1f(location_, f);
+    }
+    return *this;
+}
+
+Program::Symbol&
+Program::Symbol::operator=(const int& i)
+{
+    if (type_ == Uniform)
+    {
+        glUniform1i(location_, i);
+    }
+    return *this;
+}
+
+Program::Symbol&
+Program::operator[](const std::string& name)
+{
+    std::map<std::string, Symbol*>::iterator mapIt = symbols_.find(name);
+    if (mapIt == symbols_.end())
+    {
+        Program::Symbol::SymbolType type(Program::Symbol::Attribute);
+        int location = getAttribIndex(name);
+        if (location < 0)
+        {
+            // No attribute found by that name.  Let's try a uniform...
+            type = Program::Symbol::Uniform;
+            location = getUniformLocation(name);
+            if (location < 0)
+            {
+                type = Program::Symbol::None;
+            }
+        }
+        mapIt = symbols_.insert(mapIt, std::make_pair(name, new Symbol(name, location, type)));
+    }
+    return *(*mapIt).second;
+}
diff --git a/src/libmatrix/program.h b/src/libmatrix/program.h
new file mode 100644
index 0000000..b7ba3df
--- /dev/null
+++ b/src/libmatrix/program.h
@@ -0,0 +1,165 @@
+//
+// Copyright (c) 2011-2012 Linaro Limited
+//
+// All rights reserved. This program and the accompanying materials
+// are made available under the terms of the MIT License which accompanies
+// this distribution, and is available at
+// http://www.opensource.org/licenses/mit-license.php
+//
+// Contributors:
+//     Jesse Barker - original implementation.
+//
+#ifndef PROGRAM_H_
+#define PROGRAM_H_
+
+#include <string>
+#include <vector>
+#include <map>
+#include "mat.h"
+
+// Simple shader container.  Abstracts all of the OpenGL bits, but leaves
+// much of the semantics intact.  This is typically only referenced directly
+// by the program object.
+class Shader
+{
+public:
+    Shader() :
+        handle_(0),
+        type_(0),
+        ready_(false),
+        valid_(false) {}
+    Shader(const Shader& shader) :
+        handle_(shader.handle_),
+        type_(shader.type_),
+        source_(shader.source_),
+        message_(shader.message_),
+        ready_(shader.ready_),
+        valid_(shader.valid_) {}
+    Shader(unsigned int type, const std::string& source);
+    ~Shader();
+
+    // Compiles the shader source so that it can be linked into a
+    // program.
+    //
+    // Make sure the shader is "valid" before calling this one.
+    void compile();
+
+    // Attaches a compiled shader to a program in preparation for
+    // linking.
+    //
+    // Make sure the shader is "ready" before calling this one.
+    void attach(unsigned int program);
+
+    // Release any resources associated with this shader back to
+    // OpenGL
+    void release();
+
+    // If "valid" then the shader has successfully been created.
+    // If "ready" then the shader has successfully been compiled.
+    // If either is false, then additional information can be obtained
+    // from the error message.
+    bool valid() const { return valid_; }
+    bool ready() const { return ready_; }
+    const std::string& errorMessage() const { return message_; }
+
+private:
+    unsigned int handle_;
+    unsigned int type_;
+    std::string source_;
+    std::string message_;
+    bool ready_;
+    bool valid_;
+};
+
+// Simple program container.  Abstracts all of the OpenGL bits, but leaves
+// much of the semantics intact.
+class Program
+{
+public:
+    Program();
+    ~Program();
+
+    // Initialize the program object for use.
+    void init();
+
+    // Release any resources associated with this program back to
+    // OpenGL
+    void release();
+
+    // Create a new shader of the given type and source, compile it and
+    // attach it to the program.
+    //
+    // Make sure the program is "valid" before calling this one.
+    void addShader(unsigned int type, const std::string& source);
+
+    // Link all of the attached shaders into a runnable program for use
+    // in a rendering operation.
+    //
+    // Make sure the program is "valid" and that at least one shader
+    // has been successfully added before calling this one.
+    void build();
+
+    // Bind the program for use by the rendering context (i.e. actually
+    // run it).
+    //
+    // Make sure the program is "ready" before calling this one.
+    void start();
+
+    // Unbind the program from use by the rendering context (i.e. stop
+    // using it).
+    void stop();
+
+    class Symbol
+    {
+public:
+        enum SymbolType
+        {
+            None,
+            Attribute,
+            Uniform
+        };
+        Symbol(const std::string& name, int location, SymbolType type) :
+            type_(type),
+            location_(location),
+            name_(name) {}
+        int location() const { return location_; }
+        // These members cause data to be bound to program variables, so
+        // the program must be bound for use for these to be effective.
+        Symbol& operator=(const LibMatrix::mat4& m);
+        Symbol& operator=(const LibMatrix::mat3& m);
+        Symbol& operator=(const LibMatrix::vec2& v);
+        Symbol& operator=(const LibMatrix::vec3& v);
+        Symbol& operator=(const LibMatrix::vec4& v);
+        Symbol& operator=(const float& f);
+        Symbol& operator=(const int& i);
+private:
+        Symbol();
+        SymbolType type_;
+        GLint location_;
+        std::string name_;
+    };
+    // Get the handle to a named program input (the location in OpenGL
+    // vernacular).  Typically used in conjunction with various VertexAttrib
+    // interfaces.  Equality operators are used to load uniform data.
+    Symbol& operator[](const std::string& name);
+
+    // If "valid" then the program has successfully been created.
+    // If "ready" then the program has successfully been built.
+    // If either is false, then additional information can be obtained
+    // from the error message.
+    bool valid() const { return valid_; }
+    bool ready() const { return ready_; }
+    const std::string& errorMessage() const { return message_; }
+
+private:
+    int getAttribIndex(const std::string& name);
+    int getUniformLocation(const std::string& name);
+    unsigned int handle_;
+    std::map<std::string, Symbol*> symbols_;
+    std::vector<Shader> shaders_;
+    std::string message_;
+    bool ready_;
+    bool valid_;
+};
+
+#endif // PROGRAM_H_
diff --git a/src/libmatrix/shader-source.cc b/src/libmatrix/shader-source.cc
new file mode 100644
index 0000000..bf80d21
--- /dev/null
+++ b/src/libmatrix/shader-source.cc
@@ -0,0 +1,615 @@
+//
+// Copyright (c) 2010-2012 Linaro Limited
+//
+// All rights reserved. This program and the accompanying materials
+// are made available under the terms of the MIT License which accompanies
+// this distribution, and is available at
+// http://www.opensource.org/licenses/mit-license.php
+//
+// Contributors:
+//     Alexandros Frantzis <alexandros.frantzis@linaro.org>
+//     Jesse Barker <jesse.barker@linaro.org>
+//
+#include <istream>
+#include <memory>
+
+#include "shader-source.h"
+#include "log.h"
+#include "vec.h"
+#include "util.h"
+
+/**
+ * Holds default precision values for all shader types
+ * (even the unknown type, which is hardwired to default precision values)
+ */
+std::vector<ShaderSource::Precision>
+ShaderSource::default_precision_(ShaderSource::ShaderTypeUnknown + 1);
+
+/**
+ * Loads the contents of a file into a string.
+ *
+ * @param filename the name of the file
+ * @param str the string to put the contents of the file into
+ */
+bool
+ShaderSource::load_file(const std::string& filename, std::string& str)
+{
+    std::auto_ptr<std::istream> is_ptr(Util::get_resource(filename));
+    std::istream& inputFile(*is_ptr);
+
+    if (!inputFile)
+    {
+        Log::error("Failed to open \"%s\"\n", filename.c_str());
+        return false;
+    }
+
+    std::string curLine;
+    while (getline(inputFile, curLine))
+    {
+        str += curLine;
+        str += '\n';
+    }
+
+    return true;
+}
+
+
+/**
+ * Appends a string to the shader source.
+ *
+ * @param str the string to append
+ */
+void
+ShaderSource::append(const std::string &str)
+{
+    source_ << str;
+}
+
+/**
+ * Appends the contents of a file to the shader source.
+ *
+ * @param filename the name of the file to append
+ */
+void
+ShaderSource::append_file(const std::string &filename)
+{
+    std::string source;
+    if (load_file(filename, source))
+        source_ << source;
+}
+
+/**
+ * Replaces a string in the source with another string.
+ *
+ * @param remove the string to replace
+ * @param insert the string to replace with
+ */
+void
+ShaderSource::replace(const std::string &remove, const std::string &insert)
+{
+    std::string::size_type pos = 0;
+    std::string str(source_.str());
+
+    while ((pos = str.find(remove, pos)) != std::string::npos) {
+        str.replace(pos, remove.size(), insert);
+        pos++;
+    }
+
+    source_.clear();
+    source_.str(str);
+}
+
+/**
+ * Replaces a string in the source with the contents of a file.
+ *
+ * @param remove the string to replace
+ * @param filename the name of the file to read from
+ */
+void
+ShaderSource::replace_with_file(const std::string &remove, const std::string &filename)
+{
+    std::string source;
+    if (load_file(filename, source))
+        replace(remove, source);
+}
+
+/**
+ * Adds a string (usually containing a constant definition) at
+ * global (per shader) scope.
+ *
+ * The string is placed after any default precision qualifiers.
+ *
+ * @param str the string to add
+ */
+void
+ShaderSource::add_global(const std::string &str)
+{
+    std::string::size_type pos = 0;
+    std::string source(source_.str());
+
+    /* Find the last precision qualifier */
+    pos = source.rfind("precision");
+
+    if (pos != std::string::npos) {
+        /*
+         * Find the next #endif line of a preprocessor block that contains
+         * the precision qualifier.
+         */
+        std::string::size_type pos_if = source.find("#if", pos);
+        std::string::size_type pos_endif = source.find("#endif", pos);
+
+        if (pos_endif != std::string::npos && pos_endif < pos_if)
+            pos = pos_endif;
+
+        /* Go to the next line */
+        pos = source.find("\n", pos);
+        if (pos != std::string::npos)
+            pos++;
+    }
+    else
+        pos = 0;
+
+    source.insert(pos, str);
+
+    source_.clear();
+    source_.str(source);
+}
+
+/**
+ * Adds a string (usually containing a constant definition) at
+ * global (per shader) scope.
+ *
+ * The string is placed after any default precision qualifiers.
+ *
+ * @param function the function to add the string into
+ * @param str the string to add
+ */
+void
+ShaderSource::add_local(const std::string &str, const std::string &function)
+{
+    std::string::size_type pos = 0;
+    std::string source(source_.str());
+
+    /* Find the function */
+    pos = source.find(function);
+    pos = source.find('{', pos);
+
+    /* Go to the next line */
+    pos = source.find("\n", pos);
+    if (pos != std::string::npos)
+        pos++;
+
+    source.insert(pos, str);
+
+    source_.clear();
+    source_.str(source);
+}
+
+/**
+ * Adds a string (usually containing a constant definition) to a shader source
+ *
+ * If the function parameter is empty, the string will be added to global
+ * scope, after any precision definitions.
+ *
+ * @param str the string to add
+ * @param function if not empty, the function to add the string into
+ */
+void
+ShaderSource::add(const std::string &str, const std::string &function)
+{
+    if (!function.empty())
+        add_local(str, function);
+    else
+        add_global(str);
+}
+
+/**
+ * Adds a float constant definition.
+ *
+ * @param name the name of the constant
+ * @param f the value of the constant
+ * @param function if not empty, the function to put the definition in
+ */
+void
+ShaderSource::add_const(const std::string &name, float f,
+                        const std::string &function)
+{
+    std::stringstream ss;
+
+    ss << "const float " << name << " = " << std::fixed << f << ";" << std::endl;
+
+    add(ss.str(), function);
+}
+
+/**
+ * Adds a float array constant definition.
+ *
+ * Note that various GLSL versions (including ES) don't support
+ * array constants.
+ *
+ * @param name the name of the constant
+ * @param v the value of the constant
+ * @param function if not empty, the function to put the definition in
+ */
+void
+ShaderSource::add_const(const std::string &name, std::vector<float> &array,
+                        const std::string &function)
+{
+    std::stringstream ss;
+
+    ss << "const float " << name << "[" << array.size() << "] = {" << std::fixed;
+    for(std::vector<float>::const_iterator iter = array.begin();
+        iter != array.end();
+        iter++)
+    {
+        ss << *iter;
+        if (iter + 1 != array.end())
+            ss << ", " << std::endl;
+    }
+
+    ss << "};" << std::endl;
+
+    add(ss.str(), function);
+}
+
+/**
+ * Adds a vec2 constant definition.
+ *
+ * @param name the name of the constant
+ * @param v the value of the constant
+ * @param function if not empty, the function to put the definition in
+ */
+void
+ShaderSource::add_const(const std::string &name, const LibMatrix::vec2 &v,
+                        const std::string &function)
+{
+    std::stringstream ss;
+
+    ss << "const vec2 " << name << " = vec2(" << std::fixed;
+    ss << v.x() << ", " << v.y() << ");" << std::endl;
+
+    add(ss.str(), function);
+}
+
+/**
+ * Adds a vec3 constant definition.
+ *
+ * @param name the name of the constant
+ * @param v the value of the constant
+ * @param function if not empty, the function to put the definition in
+ */
+void
+ShaderSource::add_const(const std::string &name, const LibMatrix::vec3 &v,
+                        const std::string &function)
+{
+    std::stringstream ss;
+
+    ss << "const vec3 " << name << " = vec3(" << std::fixed;
+    ss << v.x() << ", " << v.y() << ", " << v.z() << ");" << std::endl;
+
+    add(ss.str(), function);
+}
+
+/**
+ * Adds a vec4 constant definition.
+ *
+ * @param name the name of the constant
+ * @param v the value of the constant
+ * @param function if not empty, the function to put the definition in
+ */
+void
+ShaderSource::add_const(const std::string &name, const LibMatrix::vec4 &v,
+                        const std::string &function)
+{
+    std::stringstream ss;
+
+    ss << "const vec4 " << name << " = vec4(" << std::fixed;
+    ss << v.x() << ", " << v.y() << ", " << v.z() << ", " << v.w() << ");" << std::endl;
+
+    add(ss.str(), function);
+}
+
+/**
+ * Adds a mat3 constant definition.
+ *
+ * @param name the name of the constant
+ * @param v the value of the constant
+ * @param function if not empty, the function to put the definition in
+ */
+void
+ShaderSource::add_const(const std::string &name, const LibMatrix::mat3 &m,
+                        const std::string &function)
+{
+    std::stringstream ss;
+
+    ss << "const mat3 " << name << " = mat3(" << std::fixed;
+    ss << m[0][0] << ", " << m[1][0] << ", " << m[2][0] << "," << std::endl;
+    ss << m[0][1] << ", " << m[1][1] << ", " << m[2][1] << "," << std::endl;
+    ss << m[0][2] << ", " << m[1][2] << ", " << m[2][2] << std::endl;
+    ss << ");" << std::endl;
+
+    add(ss.str(), function);
+}
+
+/**
+ * Adds a float array declaration and initialization.
+ *
+ * @param name the name of the array
+ * @param array the array values
+ * @param init_function the function to put the initialization in
+ * @param decl_function if not empty, the function to put the declaration in
+ */
+void
+ShaderSource::add_array(const std::string &name, std::vector<float> &array,
+                        const std::string &init_function,
+                        const std::string &decl_function)
+{
+    if (init_function.empty() || name.empty())
+        return;
+
+    std::stringstream ss;
+    ss << "float " << name << "[" << array.size() << "];" << std::endl;
+
+    std::string decl(ss.str());
+
+    ss.clear();
+    ss.str("");
+    ss << std::fixed;
+
+    for(std::vector<float>::const_iterator iter = array.begin();
+        iter != array.end();
+        iter++)
+    {
+        ss << name << "[" << iter - array.begin() << "] = " << *iter << ";" << std::endl;
+    }
+
+    add(ss.str(), init_function);
+
+    add(decl, decl_function);
+}
+
+/**
+ * Gets the ShaderType for this ShaderSource.
+ *
+ * If the ShaderType is unknown, an attempt is made to infer
+ * the type from the shader source contents.
+ *
+ * @return the ShaderType
+ */
+ShaderSource::ShaderType
+ShaderSource::type()
+{
+    /* Try to infer the type from the source contents */
+    if (type_ == ShaderSource::ShaderTypeUnknown) {
+        std::string source(source_.str());
+
+        if (source.find("gl_FragColor") != std::string::npos)
+            type_ = ShaderSource::ShaderTypeFragment;
+        else if (source.find("gl_Position") != std::string::npos)
+            type_ = ShaderSource::ShaderTypeVertex;
+        else
+            Log::debug("Cannot infer shader type from contents. Leaving it Unknown.\n");
+    }
+
+    return type_;
+}
+
+/**
+ * Helper function that emits a precision statement.
+ *
+ * @param ss the stringstream to add the statement to
+ * @param val the precision value
+ * @param type_str the variable type to apply the precision value to
+ */
+void
+ShaderSource::emit_precision(std::stringstream& ss, ShaderSource::PrecisionValue val,
+                             const std::string& type_str)
+{
+    static const char *precision_map[] = {
+        "lowp", "mediump", "highp", NULL
+    };
+
+    if (val == ShaderSource::PrecisionValueHigh) {
+        if (type_ == ShaderSource::ShaderTypeFragment)
+            ss << "#ifdef GL_FRAGMENT_PRECISION_HIGH" << std::endl;
+
+        ss << "precision highp " << type_str << ";" << std::endl;
+
+        if (type_ == ShaderSource::ShaderTypeFragment) {
+            ss << "#else" << std::endl;
+            ss << "precision mediump " << type_str << ";" << std::endl;
+            ss << "#endif" << std::endl;
+        }
+    }
+    else if (val >= 0 && val < ShaderSource::PrecisionValueDefault) {
+        ss << "precision " << precision_map[val] << " ";
+        ss << type_str << ";" << std::endl;
+    }
+
+    /* There is no default precision in the fragment shader, so set it to mediump */
+    if (val == ShaderSource::PrecisionValueDefault
+        && type_str == "float" && type_ == ShaderSource::ShaderTypeFragment)
+    {
+        ss << "precision mediump float;" << std::endl;
+    }
+}
+
+/**
+ * Gets a string containing the complete shader source.
+ *
+ * Precision statements are applied at this point.
+ *
+ * @return the shader source
+ */
+std::string
+ShaderSource::str()
+{
+    /* Decide which precision values to use */
+    ShaderSource::Precision precision;
+
+    /* Ensure we have tried to infer the type from the contents */
+    type();
+
+    if (precision_has_been_set_)
+        precision = precision_;
+    else
+        precision = default_precision(type_);
+
+    /* Create the precision statements */
+    std::stringstream ss;
+
+    emit_precision(ss, precision.int_precision, "int");
+    emit_precision(ss, precision.float_precision, "float");
+    emit_precision(ss, precision.sampler2d_precision, "sampler2D");
+    emit_precision(ss, precision.samplercube_precision, "samplerCube");
+
+    std::string precision_str(ss.str());
+    if (!precision_str.empty()) {
+        precision_str.insert(0, "#ifdef GL_ES\n");
+        precision_str.insert(precision_str.size(), "#endif\n");
+    }
+
+    return precision_str + source_.str();
+}
+
+/**
+ * Sets the precision that will be used for this shader.
+ *
+ * This overrides any default values set with ShaderSource::default_*_precision().
+ *
+ * @param precision the precision to set
+ */
+void
+ShaderSource::precision(const ShaderSource::Precision& precision)
+{
+    precision_ = precision;
+    precision_has_been_set_ = true;
+}
+
+/**
+ * Gets the precision that will be used for this shader.
+ *
+ * @return the precision
+ */
+const ShaderSource::Precision&
+ShaderSource::precision()
+{
+    return precision_;
+}
+
+/**
+ * Sets the default precision that will be used for a shaders type.
+ *
+ * If type is ShaderTypeUnknown the supplied precision is used for all
+ * shader types.
+ *
+ * This can be overriden per ShaderSource object by using ::precision().
+ *
+ * @param precision the default precision to set
+ * @param type the ShaderType to use the precision for
+ */
+void
+ShaderSource::default_precision(const ShaderSource::Precision& precision,
+                                ShaderSource::ShaderType type)
+{
+    if (type < 0 || type > ShaderSource::ShaderTypeUnknown)
+        type = ShaderSource::ShaderTypeUnknown;
+
+    if (type == ShaderSource::ShaderTypeUnknown) {
+        for (size_t i = 0; i < ShaderSource::ShaderTypeUnknown; i++)
+            default_precision_[i] = precision;
+    }
+    else {
+        default_precision_[type] = precision;
+    }
+}
+
+/**
+ * Gets the default precision that will be used for a shader type.
+ *
+ * It is valid to use a type of ShaderTypeUnknown. This will always
+ * return a Precision with default values.
+ *
+ * @param type the ShaderType to get the precision of
+ *
+ * @return the precision
+ */
+const ShaderSource::Precision&
+ShaderSource::default_precision(ShaderSource::ShaderType type)
+{
+    if (type < 0 || type > ShaderSource::ShaderTypeUnknown)
+        type = ShaderSource::ShaderTypeUnknown;
+
+    return default_precision_[type];
+}
+
+/****************************************
+ * ShaderSource::Precision constructors *
+ ****************************************/
+
+/**
+ * Creates a ShaderSource::Precision with default precision values.
+ */
+ShaderSource::Precision::Precision() :
+    int_precision(ShaderSource::PrecisionValueDefault),
+    float_precision(ShaderSource::PrecisionValueDefault),
+    sampler2d_precision(ShaderSource::PrecisionValueDefault),
+    samplercube_precision(ShaderSource::PrecisionValueDefault)
+{
+}
+
+/**
+ * Creates a ShaderSource::Precision using the supplied precision values.
+ */
+ShaderSource::Precision::Precision(ShaderSource::PrecisionValue int_p,
+                                   ShaderSource::PrecisionValue float_p,
+                                   ShaderSource::PrecisionValue sampler2d_p,
+                                   ShaderSource::PrecisionValue samplercube_p) :
+    int_precision(int_p), float_precision(float_p),
+    sampler2d_precision(sampler2d_p), samplercube_precision(samplercube_p)
+{
+}
+
+/**
+ * Creates a ShaderSource::Precision from a string representation of
+ * precision values.
+ *
+ * The string format is:
+ * "<int>,<float>,<sampler2d>,<samplercube>"
+ *
+ * Each precision value is one of "high", "medium", "low" or "default".
+ *
+ * @param precision_values the string representation of the precision values
+ */
+ShaderSource::Precision::Precision(const std::string& precision_values) :
+    int_precision(ShaderSource::PrecisionValueDefault),
+    float_precision(ShaderSource::PrecisionValueDefault),
+    sampler2d_precision(ShaderSource::PrecisionValueDefault),
+    samplercube_precision(ShaderSource::PrecisionValueDefault)
+{
+    std::vector<std::string> elems;
+
+    Util::split(precision_values, ',', elems, Util::SplitModeNormal);
+
+    for (size_t i = 0; i < elems.size() && i < 4; i++) {
+        const std::string& pstr(elems[i]);
+        ShaderSource::PrecisionValue pval;
+
+        if (pstr == "high")
+            pval = ShaderSource::PrecisionValueHigh;
+        else if (pstr == "medium")
+            pval = ShaderSource::PrecisionValueMedium;
+        else if (pstr == "low")
+            pval = ShaderSource::PrecisionValueLow;
+        else
+            pval = ShaderSource::PrecisionValueDefault;
+
+        switch(i) {
+            case 0: int_precision = pval; break;
+            case 1: float_precision = pval; break;
+            case 2: sampler2d_precision = pval; break;
+            case 3: samplercube_precision = pval; break;
+            default: break;
+        }
+    }
+}
diff --git a/src/libmatrix/shader-source.h b/src/libmatrix/shader-source.h
new file mode 100644
index 0000000..4dc1d1d
--- /dev/null
+++ b/src/libmatrix/shader-source.h
@@ -0,0 +1,103 @@
+//
+// Copyright (c) 2010-2012 Linaro Limited
+//
+// All rights reserved. This program and the accompanying materials
+// are made available under the terms of the MIT License which accompanies
+// this distribution, and is available at
+// http://www.opensource.org/licenses/mit-license.php
+//
+// Contributors:
+//     Alexandros Frantzis <alexandros.frantzis@linaro.org>
+//     Jesse Barker <jesse.barker@linaro.org>
+//
+#include <string>
+#include <sstream>
+#include <vector>
+#include "vec.h"
+#include "mat.h"
+
+/**
+ * Helper class for loading and manipulating shader sources.
+ */
+class ShaderSource
+{
+public:
+    enum ShaderType {
+        ShaderTypeVertex,
+        ShaderTypeFragment,
+        ShaderTypeUnknown
+    };
+
+    ShaderSource(ShaderType type = ShaderTypeUnknown) :
+        precision_has_been_set_(false), type_(type) {}
+    ShaderSource(const std::string &filename, ShaderType type = ShaderTypeUnknown) :
+        precision_has_been_set_(false), type_(type) { append_file(filename); }
+
+    void append(const std::string &str);
+    void append_file(const std::string &filename);
+
+    void replace(const std::string &remove, const std::string &insert);
+    void replace_with_file(const std::string &remove, const std::string &filename);
+
+    void add(const std::string &str, const std::string &function = "");
+
+    void add_const(const std::string &name, float f,
+                   const std::string &function = "");
+    void add_const(const std::string &name, std::vector<float> &f,
+                   const std::string &function = "");
+    void add_const(const std::string &name, const LibMatrix::vec2 &v,
+                   const std::string &function = "");
+    void add_const(const std::string &name, const LibMatrix::vec3 &v,
+                   const std::string &function = "");
+    void add_const(const std::string &name, const LibMatrix::vec4 &v,
+                   const std::string &function = "");
+    void add_const(const std::string &name, const LibMatrix::mat3 &m,
+                   const std::string &function = "");
+
+    void add_array(const std::string &name, std::vector<float> &array,
+                   const std::string &init_function,
+                   const std::string &decl_function = "");
+
+    ShaderType type();
+    std::string str();
+
+    enum PrecisionValue {
+        PrecisionValueLow,
+        PrecisionValueMedium,
+        PrecisionValueHigh,
+        PrecisionValueDefault
+    };
+
+    struct Precision {
+        Precision();
+        Precision(PrecisionValue int_p, PrecisionValue float_p,
+                  PrecisionValue sampler2d_p, PrecisionValue samplercube_p);
+        Precision(const std::string& list);
+
+        PrecisionValue int_precision;
+        PrecisionValue float_precision;
+        PrecisionValue sampler2d_precision;
+        PrecisionValue samplercube_precision;
+    };
+
+    void precision(const Precision& precision);
+    const Precision& precision();
+
+    static void default_precision(const Precision& precision,
+                                  ShaderType type = ShaderTypeUnknown);
+    static const Precision& default_precision(ShaderType type);
+
+private:
+    void add_global(const std::string &str);
+    void add_local(const std::string &str, const std::string &function);
+    bool load_file(const std::string& filename, std::string& str);
+    void emit_precision(std::stringstream& ss, ShaderSource::PrecisionValue val,
+                        const std::string& type_str);
+
+    std::stringstream source_;
+    Precision precision_;
+    bool precision_has_been_set_;
+    ShaderType type_;
+
+    static std::vector<Precision> default_precision_;
+};
diff --git a/src/libmatrix/stack.h b/src/libmatrix/stack.h
new file mode 100644
index 0000000..c14cec3
--- /dev/null
+++ b/src/libmatrix/stack.h
@@ -0,0 +1,106 @@
+//
+// Copyright (c) 2010 Linaro Limited
+//
+// All rights reserved. This program and the accompanying materials
+// are made available under the terms of the MIT License which accompanies
+// this distribution, and is available at
+// http://www.opensource.org/licenses/mit-license.php
+//
+// Contributors:
+//     Jesse Barker - original implementation.
+//
+#ifndef STACK_H_
+#define STACK_H_
+
+#include <vector>
+#include "mat.h"
+
+namespace LibMatrix
+{
+//
+// Simple matrix stack implementation suitable for tracking OpenGL matrix
+// state.  Default construction puts an identity matrix on the top of the 
+// stack.
+//
+template<typename T>
+class MatrixStack
+{
+public:
+    MatrixStack()
+    {
+        theStack_.push_back(T());
+    }
+    MatrixStack(const T& matrix)
+    {
+        theStack_.push_back(matrix);
+    }
+    ~MatrixStack() {}
+
+    const T& getCurrent() const { return theStack_.back(); }
+
+    void push()
+    {
+        theStack_.push_back(theStack_.back());
+    }
+    void pop()
+    {
+        theStack_.pop_back();
+    }
+    void loadIdentity()
+    {
+        theStack_.back().setIdentity();
+    }
+    T& operator*=(const T& rhs)
+    {
+        T& curMatrix = theStack_.back();
+        curMatrix *= rhs;
+        return curMatrix;
+    }
+    void print() const
+    {
+        const T& curMatrix = theStack_.back();
+        curMatrix.print();
+    }
+    unsigned int getDepth() const { return theStack_.size(); }
+private:
+    std::vector<T> theStack_;
+};
+
+class Stack4 : public MatrixStack<mat4> 
+{
+public:
+    void translate(float x, float y, float z)
+    {
+        *this *= Mat4::translate(x, y, z);
+    }
+    void scale(float x, float y, float z)
+    {
+        *this *= Mat4::scale(x, y, z);
+    }
+    void rotate(float angle, float x, float y, float z)
+    {
+        *this *= Mat4::rotate(angle, x, y, z);
+    }
+    void frustum(float left, float right, float bottom, float top, float near, float far)
+    {
+        *this *= Mat4::frustum(left, right, bottom, top, near, far);
+    }
+    void ortho(float left, float right, float bottom, float top, float near, float far)
+    {
+        *this *= Mat4::ortho(left, right, bottom, top, near, far);
+    }
+    void perspective(float fovy, float aspect, float zNear, float zFar)
+    {
+        *this *= Mat4::perspective(fovy, aspect, zNear, zFar);
+    }
+    void lookAt(float eyeX, float eyeY, float eyeZ, 
+                float centerX, float centerY, float centerZ, 
+                float upX, float upY, float upZ)
+    {
+        *this *= Mat4::lookAt(eyeX, eyeY, eyeZ, centerX, centerY, centerZ, upX, upY, upZ);
+    }
+};
+
+} // namespace LibMatrix
+
+#endif // STACK_H_
diff --git a/src/libmatrix/test/basic-global-const.vert b/src/libmatrix/test/basic-global-const.vert
new file mode 100644
index 0000000..18dc358
--- /dev/null
+++ b/src/libmatrix/test/basic-global-const.vert
@@ -0,0 +1,15 @@
+const vec4 ConstantColor = vec4(1.000000, 1.000000, 1.000000, 1.000000);
+attribute vec3 position;
+
+uniform mat4 modelview;
+uniform mat4 projection;
+
+varying vec4 color;
+
+void
+main(void)
+{
+    vec4 curVertex = vec4(position, 1.0);
+    gl_Position = projection * modelview * curVertex;
+    color = ConstantColor;
+}
diff --git a/src/libmatrix/test/basic.frag b/src/libmatrix/test/basic.frag
new file mode 100644
index 0000000..1b648db
--- /dev/null
+++ b/src/libmatrix/test/basic.frag
@@ -0,0 +1,7 @@
+varying vec4 color;
+
+void
+main(void)
+{
+    gl_FragColor = color;
+}
diff --git a/src/libmatrix/test/basic.vert b/src/libmatrix/test/basic.vert
new file mode 100644
index 0000000..d93289e
--- /dev/null
+++ b/src/libmatrix/test/basic.vert
@@ -0,0 +1,14 @@
+attribute vec3 position;
+
+uniform mat4 modelview;
+uniform mat4 projection;
+
+varying vec4 color;
+
+void
+main(void)
+{
+    vec4 curVertex = vec4(position, 1.0);
+    gl_Position = projection * modelview * curVertex;
+    color = ConstantColor;
+}
diff --git a/src/libmatrix/test/const_vec_test.cc b/src/libmatrix/test/const_vec_test.cc
new file mode 100644
index 0000000..879d4e6
--- /dev/null
+++ b/src/libmatrix/test/const_vec_test.cc
@@ -0,0 +1,60 @@
+//
+// Copyright (c) 2011 Linaro Limited
+//
+// All rights reserved. This program and the accompanying materials
+// are made available under the terms of the MIT License which accompanies
+// this distribution, and is available at
+// http://www.opensource.org/licenses/mit-license.php
+//
+// Contributors:
+//     Jesse Barker - original implementation.
+//
+#include <iostream>
+#include "libmatrix_test.h"
+#include "const_vec_test.h"
+#include "../vec.h"
+
+using LibMatrix::vec2;
+using LibMatrix::vec3;
+using LibMatrix::vec4;
+using std::cout;
+using std::endl;
+
+void
+Vec2TestConstOperator::run(const Options& options)
+{
+    const vec2 a(1.0, 1.0);
+    const vec2 b(2.0, 2.0);
+    vec2 aplusb(a + b);
+    vec2 aminusb(a - b);
+    vec2 atimesb(a * b);
+    vec2 adivb(a / b);
+    const float s(2.5);
+    vec2 stimesb(s * b);
+}
+
+void
+Vec3TestConstOperator::run(const Options& options)
+{
+    const vec3 a(1.0, 1.0, 1.0);
+    const vec3 b(2.0, 2.0, 2.0);
+    vec3 aplusb(a + b);
+    vec3 aminusb(a - b);
+    vec3 atimesb(a * b);
+    vec3 adivb(a / b);
+    const float s(2.5);
+    vec3 stimesb(s * b);
+}
+
+void
+Vec4TestConstOperator::run(const Options& options)
+{
+    const vec4 a(1.0, 1.0, 1.0, 1.0);
+    const vec4 b(2.0, 2.0, 2.0, 2.0);
+    vec4 aplusb(a + b);
+    vec4 aminusb(a - b);
+    vec4 atimesb(a * b);
+    vec4 adivb(a / b);
+    const float s(2.5);
+    vec4 stimesb(s * b);
+}
diff --git a/src/libmatrix/test/const_vec_test.h b/src/libmatrix/test/const_vec_test.h
new file mode 100644
index 0000000..834f4a8
--- /dev/null
+++ b/src/libmatrix/test/const_vec_test.h
@@ -0,0 +1,39 @@
+//
+// Copyright (c) 2011 Linaro Limited
+//
+// All rights reserved. This program and the accompanying materials
+// are made available under the terms of the MIT License which accompanies
+// this distribution, and is available at
+// http://www.opensource.org/licenses/mit-license.php
+//
+// Contributors:
+//     Jesse Barker - original implementation.
+//
+#ifndef CONST_VEC_TEST_H_
+#define CONST_VEC_TEST_H_
+
+class MatrixTest;
+class Options;
+
+class Vec2TestConstOperator : public MatrixTest
+{
+public:
+    Vec2TestConstOperator() : MatrixTest("vec2::const") {}
+    virtual void run(const Options& options);
+};
+
+class Vec3TestConstOperator : public MatrixTest
+{
+public:
+    Vec3TestConstOperator() : MatrixTest("vec3::const") {}
+    virtual void run(const Options& options);
+};
+
+class Vec4TestConstOperator : public MatrixTest
+{
+public:
+    Vec4TestConstOperator() : MatrixTest("vec4::const") {}
+    virtual void run(const Options& options);
+};
+
+#endif // CONST_VEC_TEST_H_
diff --git a/src/libmatrix/test/inverse_test.cc b/src/libmatrix/test/inverse_test.cc
new file mode 100644
index 0000000..51a8072
--- /dev/null
+++ b/src/libmatrix/test/inverse_test.cc
@@ -0,0 +1,172 @@
+//
+// Copyright (c) 2010 Linaro Limited
+//
+// All rights reserved. This program and the accompanying materials
+// are made available under the terms of the MIT License which accompanies
+// this distribution, and is available at
+// http://www.opensource.org/licenses/mit-license.php
+//
+// Contributors:
+//     Jesse Barker - original implementation.
+//
+#include <iostream>
+#include "libmatrix_test.h"
+#include "inverse_test.h"
+#include "../mat.h"
+
+using LibMatrix::mat2;
+using LibMatrix::mat3;
+using LibMatrix::mat4;
+using std::cout;
+using std::endl;
+
+void
+MatrixTest2x2Inverse::run(const Options& options)
+{
+    mat2 m;
+
+    if (options.beVerbose())
+    {
+        cout << "Starting with mat2 (should be identity): " << endl << endl;
+        m.print();
+    }
+
+    m[0][1] = -2.5;
+    
+    if (options.beVerbose())
+    {
+        cout << endl << "Matrix should now have (0, 1) == -2.500000" << endl << endl;
+        m.print();
+    }
+    
+    mat2 mi(m);
+
+    if (options.beVerbose())
+    {
+        cout << endl << "Copy of previous matrix (should have (0, 1) == -2.500000)" << endl << endl;
+        mi.print();
+    }
+
+    mi.inverse();
+
+    if (options.beVerbose())
+    {
+        cout << endl << "Inverse of copy: " << endl << endl;
+        mi.print();
+    }
+
+    mat2 i = m * mi;
+
+    if (options.beVerbose())
+    {
+        cout << endl << "Product of original and inverse (should be identity): " << endl << endl;
+        i.print();
+    }
+
+    mat2 ident;
+    if (i == ident)
+    {
+        pass_ = true;
+    }
+}
+
+void
+MatrixTest3x3Inverse::run(const Options& options)
+{
+    mat3 m;
+
+    if (options.beVerbose())
+    {
+        cout << "Starting with mat3 (should be identity): " << endl << endl;
+        m.print();
+    }
+
+    m[1][2] = -2.5;
+    
+    if (options.beVerbose())
+    {
+        cout << endl << "Matrix should now have (1, 2) == -2.500000" << endl << endl;
+        m.print();
+    }
+
+    mat3 mi(m);
+
+    if (options.beVerbose())
+    {
+        cout << endl << "Copy of previous matrix (should have (1, 2) == -2.500000)" << endl << endl;
+        mi.print();
+    }
+
+    mi.inverse();
+
+    if (options.beVerbose())
+    {
+        cout << endl << "Inverse of copy: " << endl << endl;
+        mi.print();
+    }
+
+    mat3 i = m * mi;
+
+    if (options.beVerbose())
+    {
+        cout << endl << "Product of original and inverse (should be identity): " << endl << endl;
+        i.print();
+    }
+
+    mat3 ident;
+    if (i == ident)
+    {
+        pass_ = true;
+    }
+}
+
+void
+MatrixTest4x4Inverse::run(const Options& options)
+{
+    mat4 m;
+
+    if (options.beVerbose())
+    {
+        cout << "Starting with mat4 (should be identity): " << endl << endl;
+        m.print();
+    }
+
+    m[2][3] = -2.5;
+    
+    if (options.beVerbose())
+    {
+        cout << endl << "Matrix should now have (2, 3) == -2.500000" << endl << endl;
+        m.print();
+    }
+
+    mat4 mi(m);
+
+    if (options.beVerbose())
+    {
+        cout << endl << "Copy of previous matrix (should have (2, 3) == -2.500000)" << endl << endl;
+        mi.print();
+    }
+
+    mi.inverse();
+
+    if (options.beVerbose())
+    {
+        cout << endl << "Inverse of copy: " << endl << endl;
+        mi.print();
+    }
+
+    mat4 i = m * mi;
+
+    if (options.beVerbose())
+    {
+        cout << endl <<  "Product of original and inverse (should be identity): " << endl << endl;
+        i.print();
+    }
+
+    mat4 ident;
+    if (i == ident)
+    {
+        pass_ = true;
+    }
+}
+
diff --git a/src/libmatrix/test/inverse_test.h b/src/libmatrix/test/inverse_test.h
new file mode 100644
index 0000000..4c5b584
--- /dev/null
+++ b/src/libmatrix/test/inverse_test.h
@@ -0,0 +1,39 @@
+//
+// Copyright (c) 2010 Linaro Limited
+//
+// All rights reserved. This program and the accompanying materials
+// are made available under the terms of the MIT License which accompanies
+// this distribution, and is available at
+// http://www.opensource.org/licenses/mit-license.php
+//
+// Contributors:
+//     Jesse Barker - original implementation.
+//
+#ifndef INVERSE_TEST_H_
+#define INVERSE_TEST_H_
+
+class MatrixTest;
+class Options;
+
+class MatrixTest2x2Inverse : public MatrixTest
+{
+public:
+    MatrixTest2x2Inverse() : MatrixTest("mat2::inverse") {}
+    virtual void run(const Options& options);
+};
+
+class MatrixTest3x3Inverse : public MatrixTest
+{
+public:
+    MatrixTest3x3Inverse() : MatrixTest("mat3::inverse") {}
+    virtual void run(const Options& options);
+};
+
+class MatrixTest4x4Inverse : public MatrixTest
+{
+public:
+    MatrixTest4x4Inverse() : MatrixTest("mat4::inverse") {}
+    virtual void run(const Options& options);
+};
+
+#endif // INVERSE_TEST_H_
diff --git a/src/libmatrix/test/libmatrix_test.cc b/src/libmatrix/test/libmatrix_test.cc
new file mode 100644
index 0000000..5e4ff12
--- /dev/null
+++ b/src/libmatrix/test/libmatrix_test.cc
@@ -0,0 +1,72 @@
+//
+// Copyright (c) 2010 Linaro Limited
+//
+// All rights reserved. This program and the accompanying materials
+// are made available under the terms of the MIT License which accompanies
+// this distribution, and is available at
+// http://www.opensource.org/licenses/mit-license.php
+//
+// Contributors:
+//     Jesse Barker - original implementation.
+//     Alexandros Frantzis - Util::split tests
+//
+#include <iostream>
+#include <string>
+#include <vector>
+#include "libmatrix_test.h"
+#include "inverse_test.h"
+#include "transpose_test.h"
+#include "const_vec_test.h"
+#include "shader_source_test.h"
+#include "util_split_test.h"
+
+using std::cerr;
+using std::cout;
+using std::endl;
+
+int
+main(int argc, char** argv)
+{
+    Options testOptions("matrix_test");
+    testOptions.parseArgs(argc, argv);
+    if (testOptions.showHelp())
+    {
+        testOptions.printUsage();
+        return 0;
+    }
+
+    using std::vector;
+    vector<MatrixTest*> testVec;
+    testVec.push_back(new MatrixTest2x2Inverse());
+    testVec.push_back(new MatrixTest3x3Inverse());
+    testVec.push_back(new MatrixTest4x4Inverse());
+    testVec.push_back(new MatrixTest2x2Transpose());
+    testVec.push_back(new MatrixTest3x3Transpose());
+    testVec.push_back(new MatrixTest4x4Transpose());
+    testVec.push_back(new ShaderSourceBasic());
+    testVec.push_back(new UtilSplitTestNormal());
+    testVec.push_back(new UtilSplitTestQuoted());
+
+    for (vector<MatrixTest*>::iterator testIt = testVec.begin();
+         testIt != testVec.end();
+         testIt++)
+    {
+        MatrixTest* curTest = *testIt;
+        if (testOptions.beVerbose())
+        {
+            cout << "Running test " << curTest->name() << endl;
+        }
+        curTest->run(testOptions);
+        if (!curTest->passed())
+        {
+            cerr << curTest->name() << " does not work!" << endl;
+            return 1;
+        }
+        if (testOptions.beVerbose())
+        {
+            cout << curTest->name() << " is okay!" << endl;
+        }
+    }
+
+    return 0;
+}
diff --git a/src/libmatrix/test/libmatrix_test.h b/src/libmatrix/test/libmatrix_test.h
new file mode 100644
index 0000000..4ae0a8a
--- /dev/null
+++ b/src/libmatrix/test/libmatrix_test.h
@@ -0,0 +1,51 @@
+//
+// Copyright (c) 2010 Linaro Limited
+//
+// All rights reserved. This program and the accompanying materials
+// are made available under the terms of the MIT License which accompanies
+// this distribution, and is available at
+// http://www.opensource.org/licenses/mit-license.php
+//
+// Contributors:
+//     Jesse Barker - original implementation.
+//
+#ifndef LIBMATRIX_TEST_H_
+#define LIBMATRIX_TEST_H_
+
+class Options
+{
+    Options();
+    static const std::string verbose_name_;
+    static const std::string help_name_;
+    std::string app_name_;
+    bool show_help_;
+    bool verbose_;
+public:
+    Options(const std::string& app_name) :
+        app_name_(app_name),
+        show_help_(false),
+        verbose_(false) {}
+    ~Options() {}
+    bool beVerbose() const { return verbose_; }
+    bool showHelp() const { return show_help_; }
+    void parseArgs(int argc, char** argv);
+    void printUsage();
+};
+
+class MatrixTest
+{
+    std::string name_;
+protected:
+    bool pass_;
+    MatrixTest();
+public:
+    MatrixTest(const std::string& name) : 
+        name_(name),
+        pass_(false) {}
+    ~MatrixTest();
+    const std::string& name() const { return name_; }
+    virtual void run(const Options& options) = 0;
+    const bool passed() const { return pass_; }
+};
+
+#endif // LIBMATRIX_TEST_H_
diff --git a/src/libmatrix/test/options.cc b/src/libmatrix/test/options.cc
new file mode 100644
index 0000000..ec15f3c
--- /dev/null
+++ b/src/libmatrix/test/options.cc
@@ -0,0 +1,76 @@
+//
+// Copyright (c) 2010 Linaro Limited
+//
+// All rights reserved. This program and the accompanying materials
+// are made available under the terms of the MIT License which accompanies
+// this distribution, and is available at
+// http://www.opensource.org/licenses/mit-license.php
+//
+// Contributors:
+//     Jesse Barker - original implementation.
+//
+#include <iostream>
+#include <iomanip>
+#include <getopt.h>
+#include "libmatrix_test.h"
+
+using std::cout;
+using std::endl;
+
+const std::string Options::verbose_name_("verbose");
+const std::string Options::help_name_("help");
+
+void
+Options::parseArgs(int argc, char** argv)
+{
+    static struct option long_options[] = {
+        {"verbose", 0, 0, 0},
+        {"help", 0, 0, 0},
+        {0, 0, 0, 0}
+    };
+    int option_index(0);
+    int c =  getopt_long(argc, argv, "", long_options, &option_index);
+    while (c != -1) 
+    {
+        // getopt_long() returns '?' and prints an "unrecognized option" error
+        // to stderr if it does not recognize an option.  Just trigger
+        // the help/usage message, stop processing and get out.
+        if (c == '?')
+        {
+            show_help_ = true;
+            break;
+        }
+
+        std::string optname(long_options[option_index].name);
+
+        if (optname == verbose_name_)
+        {
+            verbose_ = true;
+        }
+        else if (optname == help_name_)
+        {
+            show_help_ = true;
+        }
+        c = getopt_long(argc, argv, "",
+                        long_options, &option_index);
+    }
+}
+
+
+static void
+emitColumnOne(const std::string& text)
+{
+    cout << std::setw(16) << text;
+}
+
+void
+Options::printUsage()
+{
+    cout << app_name_ << ": directed functional test utility for libmatrix." << endl;
+    cout << "Options:" << endl;
+    emitColumnOne("--verbose"); 
+    cout << std::setw(0) << " Enable verbose output during test runs." << endl;
+    emitColumnOne("--help");
+    cout << std::setw(0) << " Print this usage text." << endl;   
+}
+
diff --git a/src/libmatrix/test/shader_source_test.cc b/src/libmatrix/test/shader_source_test.cc
new file mode 100644
index 0000000..31d0265
--- /dev/null
+++ b/src/libmatrix/test/shader_source_test.cc
@@ -0,0 +1,49 @@
+//
+// Copyright (c) 2012 Linaro Limited
+//
+// All rights reserved. This program and the accompanying materials
+// are made available under the terms of the MIT License which accompanies
+// this distribution, and is available at
+// http://www.opensource.org/licenses/mit-license.php
+//
+// Contributors:
+//     Jesse Barker - original implementation.
+//
+#include <string>
+#include "libmatrix_test.h"
+#include "shader_source_test.h"
+#include "../shader-source.h"
+#include "../vec.h"
+
+using std::string;
+using LibMatrix::vec4;
+
+void
+ShaderSourceBasic::run(const Options& options)
+{
+    static const string vtx_shader_filename("test/basic.vert");
+
+    ShaderSource vtx_source(vtx_shader_filename);
+    ShaderSource vtx_source2(vtx_shader_filename);
+    
+    pass_ = (vtx_source.str() == vtx_source2.str());
+}
+
+void
+ShaderSourceAddConstGlobal::run(const Options& options)
+{
+    // Load the original shader source.
+    static const string src_shader_filename("test/basic.vert");
+    ShaderSource src_shader(src_shader_filename);
+
+    // Add constant at global scope
+    static const vec4 constantColor(1.0, 1.0, 1.0, 1.0);
+    src_shader.add_const("ConstantColor", constantColor);
+
+    // Load the pre-modified shader
+    static const string result_shader_filename("test/basic-global-const.vert");
+    ShaderSource result_shader(result_shader_filename);
+
+    // Compare the output strings to confirm the results.
+    pass_ = (src_shader.str() == result_shader.str());
+}
diff --git a/src/libmatrix/test/shader_source_test.h b/src/libmatrix/test/shader_source_test.h
new file mode 100644
index 0000000..cf49766
--- /dev/null
+++ b/src/libmatrix/test/shader_source_test.h
@@ -0,0 +1,32 @@
+//
+// Copyright (c) 2012 Linaro Limited
+//
+// All rights reserved. This program and the accompanying materials
+// are made available under the terms of the MIT License which accompanies
+// this distribution, and is available at
+// http://www.opensource.org/licenses/mit-license.php
+//
+// Contributors:
+//     Jesse Barker - original implementation.
+//
+#ifndef SHADER_SOURCE_TEST_H_
+#define SHADER_SOURCE_TEST_H_
+
+class MatrixTest;
+class Options;
+
+class ShaderSourceBasic : public MatrixTest
+{
+public:
+    ShaderSourceBasic() : MatrixTest("ShaderSource::basic") {}
+    virtual void run(const Options& options);
+};
+
+class ShaderSourceAddConstGlobal : public MatrixTest
+{
+public:
+    ShaderSourceAddConstGlobal() : MatrixTest("ShaderSource::AddConstGlobal") {}
+    virtual void run(const Options& options);
+};
+
+#endif // SHADER_SOURCE_TEST_H
diff --git a/src/libmatrix/test/transpose_test.cc b/src/libmatrix/test/transpose_test.cc
new file mode 100644
index 0000000..574486d
--- /dev/null
+++ b/src/libmatrix/test/transpose_test.cc
@@ -0,0 +1,297 @@
+//
+// Copyright (c) 2010 Linaro Limited
+//
+// All rights reserved. This program and the accompanying materials
+// are made available under the terms of the MIT License which accompanies
+// this distribution, and is available at
+// http://www.opensource.org/licenses/mit-license.php
+//
+// Contributors:
+//     Jesse Barker - original implementation.
+//
+#include <iostream>
+#include "libmatrix_test.h"
+#include "transpose_test.h"
+#include "../mat.h"
+
+using LibMatrix::mat2;
+using LibMatrix::mat3;
+using LibMatrix::mat4;
+using std::cout;
+using std::endl;
+
+void
+MatrixTest2x2Transpose::run(const Options& options)
+{
+    // First, a simple test to ensure that the transpose of the identity is
+    // the identity.
+    if (options.beVerbose())
+    {
+        cout << endl << "Assertion 1: Transpose of the identity is the identity." << endl << endl;
+    }
+
+    mat2 m;
+
+    if (options.beVerbose())
+    {
+        cout << "Starting with mat2 (should be identity): " << endl << endl;
+        m.print();
+    }
+
+    m.transpose();
+
+    if (options.beVerbose())
+    {
+        cout << endl << "Transpose of identity (should be identity): " << endl << endl;
+        m.print();
+    }
+
+    mat2 mi;
+    if (m != mi)
+    {
+        // FAIL! Transpose of the identity is the identity.
+        return;
+    }
+
+    // At this point, we have 2 identity matrices.
+    // Next, set an element in the matrix and transpose twice.  We should see
+    // the original matrix (with i,j set).
+    if (options.beVerbose())
+    {
+        cout << endl << "Assertion 2: Transposing a matrix twice yields the original matrix." << endl << endl;
+    }
+
+    m[0][1] = 6.3;
+
+    if (options.beVerbose())
+    {
+        cout << "Matrix should now have (0, 1) == 6.300000" << endl << endl;
+        m.print();
+    }
+    
+    mi = m;
+
+    m.transpose().transpose();
+
+    if (options.beVerbose())
+    {
+        cout << endl << "Matrix should now have (0, 1) == 6.300000" << endl << endl;
+        m.print();
+    }
+    
+    if (m != mi)
+    {
+        // FAIL! Transposing the same matrix twice should yield the original.
+        return;
+    }    
+
+    // Next, reset mi back to the identity.  Set element element j,i in this
+    // matrix and transpose m.  They should now be equal.
+    if (options.beVerbose())
+    {
+        cout << endl << "Assertion 3: Transpose of matrix (i,j) == x is equal to matrix (j,i) == x." << endl << endl;
+    }
+
+    mi.setIdentity();
+    mi[1][0] = 6.3;
+
+    m.transpose();
+
+    if (options.beVerbose())
+    {
+        cout << "Matrix should now have (1, 0) == 6.300000" << endl << endl;
+        m.print();
+        cout << endl;
+    }
+    
+    if (m == mi)
+    {
+        pass_ = true;
+    }
+
+    // FAIL! Transposing the same matrix twice should yield the original.
+}
+
+void
+MatrixTest3x3Transpose::run(const Options& options)
+{
+    // First, a simple test to ensure that the transpose of the identity is
+    // the identity.
+    if (options.beVerbose())
+    {
+        cout << endl << "Assertion 1: Transpose of the identity is the identity." << endl << endl;
+    }
+
+    mat3 m;
+
+    if (options.beVerbose())
+    {
+        cout << "Starting with mat2 (should be identity): " << endl << endl;
+        m.print();
+    }
+
+    m.transpose();
+
+    if (options.beVerbose())
+    {
+        cout << endl << "Transpose of identity (should be identity): " << endl << endl;
+        m.print();
+    }
+
+    mat3 mi;
+    if (m != mi)
+    {
+        // FAIL! Transpose of the identity is the identity.
+        return;
+    }
+
+    // At this point, we have 2 identity matrices.
+    // Next, set an element in the matrix and transpose twice.  We should see
+    // the original matrix (with i,j set).
+    if (options.beVerbose())
+    {
+        cout << endl << "Assertion 2: Transposing a matrix twice yields the original matrix." << endl << endl;
+    }
+
+    m[0][1] = 6.3;
+
+    if (options.beVerbose())
+    {
+        cout << "Matrix should now have (0, 1) == 6.300000" << endl << endl;
+        m.print();
+    }
+    
+    mi = m;
+
+    m.transpose().transpose();
+
+    if (options.beVerbose())
+    {
+        cout << endl << "Matrix should now have (0, 1) == 6.300000" << endl << endl;
+        m.print();
+    }
+    
+    if (m != mi)
+    {
+        // FAIL! Transposing the same matrix twice should yield the original.
+        return;
+    }    
+
+    // Next, reset mi back to the identity.  Set element element j,i in this
+    // matrix and transpose m.  They should now be equal.
+    if (options.beVerbose())
+    {
+        cout << endl << "Assertion 3: Transpose of matrix (i,j) == x is equal to matrix (j,i) == x." << endl << endl;
+    }
+
+    mi.setIdentity();
+    mi[1][0] = 6.3;
+
+    m.transpose();
+
+    if (options.beVerbose())
+    {
+        cout << "Matrix should now have (1, 0) == 6.300000" << endl << endl;
+        m.print();
+        cout << endl;
+    }
+    
+    if (m == mi)
+    {
+        pass_ = true;
+    }
+
+    // FAIL! Transposing the same matrix twice should yield the original.
+}
+
+void
+MatrixTest4x4Transpose::run(const Options& options)
+{
+    // First, a simple test to ensure that the transpose of the identity is
+    // the identity.
+    if (options.beVerbose())
+    {
+        cout << endl << "Assertion 1: Transpose of the identity is the identity." << endl << endl;
+    }
+
+    mat4 m;
+
+    if (options.beVerbose())
+    {
+        cout << "Starting with mat2 (should be identity): " << endl << endl;
+        m.print();
+    }
+
+    m.transpose();
+
+    if (options.beVerbose())
+    {
+        cout << endl << "Transpose of identity (should be identity): " << endl << endl;
+        m.print();
+    }
+
+    mat4 mi;
+    if (m != mi)
+    {
+        // FAIL! Transpose of the identity is the identity.
+        return;
+    }
+
+    // At this point, we have 2 identity matrices.
+    // Next, set an element in the matrix and transpose twice.  We should see
+    // the original matrix (with i,j set).
+    if (options.beVerbose())
+    {
+        cout << endl << "Assertion 2: Transposing a matrix twice yields the original matrix." << endl << endl;
+    }
+
+    m[0][1] = 6.3;
+
+    if (options.beVerbose())
+    {
+        cout << "Matrix should now have (0, 1) == 6.300000" << endl << endl;
+        m.print();
+    }
+    
+    mi = m;
+
+    m.transpose().transpose();
+
+    if (options.beVerbose())
+    {
+        cout << endl << "Matrix should now have (0, 1) == 6.300000" << endl << endl;
+        m.print();
+    }
+    
+    if (m != mi)
+    {
+        // FAIL! Transposing the same matrix twice should yield the original.
+        return;
+    }    
+
+    // Next, reset mi back to the identity.  Set element element j,i in this
+    // matrix and transpose m.  They should now be equal.
+    if (options.beVerbose())
+    {
+        cout << endl << "Assertion 3: Transpose of matrix (i,j) == x is equal to matrix (j,i) == x." << endl << endl;
+    }
+
+    mi.setIdentity();
+    mi[1][0] = 6.3;
+
+    m.transpose();
+
+    if (options.beVerbose())
+    {
+        cout << "Matrix should now have (1, 0) == 6.300000" << endl << endl;
+        m.print();
+        cout << endl;
+    }
+    
+    if (m == mi)
+    {
+        pass_ = true;
+    }
+
+    // FAIL! Transposing the same matrix twice should yield the original.
+}
diff --git a/src/libmatrix/test/transpose_test.h b/src/libmatrix/test/transpose_test.h
new file mode 100644
index 0000000..3a4398f
--- /dev/null
+++ b/src/libmatrix/test/transpose_test.h
@@ -0,0 +1,38 @@
+//
+// Copyright (c) 2010 Linaro Limited
+//
+// All rights reserved. This program and the accompanying materials
+// are made available under the terms of the MIT License which accompanies
+// this distribution, and is available at
+// http://www.opensource.org/licenses/mit-license.php
+//
+// Contributors:
+//     Jesse Barker - original implementation.
+//
+#ifndef TRANSPOSE_TEST_H_
+#define TRANSPOSE_TEST_H_
+
+class MatrixTest;
+class Options;
+
+class MatrixTest2x2Transpose : public MatrixTest
+{
+public:
+    MatrixTest2x2Transpose() : MatrixTest("mat2::transpose") {}
+    virtual void run(const Options& options);
+};
+
+class MatrixTest3x3Transpose : public MatrixTest
+{
+public:
+    MatrixTest3x3Transpose() : MatrixTest("mat3::transpose") {}
+    virtual void run(const Options& options);
+};
+
+class MatrixTest4x4Transpose : public MatrixTest
+{
+public:
+    MatrixTest4x4Transpose() : MatrixTest("mat4::transpose") {}
+    virtual void run(const Options& options);
+};
+#endif // TRANSPOSE_TEST_H_
diff --git a/src/libmatrix/test/util_split_test.cc b/src/libmatrix/test/util_split_test.cc
new file mode 100644
index 0000000..4399f77
--- /dev/null
+++ b/src/libmatrix/test/util_split_test.cc
@@ -0,0 +1,180 @@
+//
+// Copyright (c) 2012 Linaro Limited
+//
+// All rights reserved. This program and the accompanying materials
+// are made available under the terms of the MIT License which accompanies
+// this distribution, and is available at
+// http://www.opensource.org/licenses/mit-license.php
+//
+// Contributors:
+//     Alexandros Frantzis - original implementation.
+//
+#include <iostream>
+#include <string>
+#include <vector>
+#include "libmatrix_test.h"
+#include "util_split_test.h"
+#include "../util.h"
+
+using std::cout;
+using std::endl;
+using std::string;
+using std::vector;
+
+template <typename T> static bool
+areVectorsEqual(vector<T>& vec1, vector<T>& vec2)
+{
+    if (vec1.size() != vec2.size())
+        return false;
+
+    for (unsigned int i = 0; i < vec1.size(); i++)
+    {
+        if (vec1[i] != vec2[i])
+            return false;
+    }
+
+    return true;
+}
+
+template <typename T> static void
+printVector(vector<T>& vec)
+{
+    cout << "[";
+    for (unsigned int i = 0; i < vec.size(); i++)
+    {
+        cout << '"' << vec[i] << '"';
+        if (i < vec.size() - 1)
+            cout << ", ";
+    }
+    cout << "]";
+}
+
+void
+UtilSplitTestNormal::run(const Options& options)
+{
+    const string test1("abc def ghi");
+    const string test2(" abc: def :ghi ");
+    vector<string> expected1;
+    vector<string> expected2;
+    vector<string> results;
+
+    expected1.push_back("abc");
+    expected1.push_back("def");
+    expected1.push_back("ghi");
+
+    expected2.push_back(" abc");
+    expected2.push_back(" def ");
+    expected2.push_back("ghi ");
+
+    if (options.beVerbose())
+    {
+        cout << "Testing string \"" << test1 << "\"" << endl;
+    }
+
+    Util::split(test1, ' ', results, Util::SplitModeNormal);
+
+    if (options.beVerbose())
+    {
+        cout << "Split result: ";
+        printVector(results);
+        cout << endl << "Expected: ";
+        printVector(expected1);
+        cout << endl;
+    }
+
+    if (!areVectorsEqual(results, expected1))
+    {
+        return;
+    }
+
+    results.clear();
+
+    if (options.beVerbose())
+    {
+        cout << "Testing string \"" << test2 << "\"" << endl;
+    }
+
+    Util::split(test2, ':', results, Util::SplitModeNormal);
+
+    if (options.beVerbose())
+    {
+        cout << "Split result: ";
+        printVector(results);
+        cout << endl << "Expected: ";
+        printVector(expected2);
+        cout << endl;
+    }
+
+    if (!areVectorsEqual(results, expected2))
+    {
+        return;
+    }
+
+    pass_ = true;
+}
+
+void
+UtilSplitTestQuoted::run(const Options& options)
+{
+    const string test1("abc \"def' ghi\" klm\\ nop -b qr:title='123 \"456'");
+    const string test2("abc: def='1:2:3:'ghi : \":jk\"");
+    vector<string> expected1;
+    vector<string> expected2;
+    vector<string> results;
+
+    expected1.push_back("abc");
+    expected1.push_back("def' ghi");
+    expected1.push_back("klm nop");
+    expected1.push_back("-b");
+    expected1.push_back("qr:title=123 \"456");
+
+    expected2.push_back("abc");
+    expected2.push_back(" def=1:2:3:ghi ");
+    expected2.push_back(" :jk");
+
+    if (options.beVerbose())
+    {
+        cout << "Testing string \"" << test1 << "\"" << endl;
+    }
+
+    Util::split(test1, ' ', results, Util::SplitModeQuoted);
+
+    if (options.beVerbose())
+    {
+        cout << "Split result: ";
+        printVector(results);
+        cout << endl << "Expected: ";
+        printVector(expected1);
+        cout << endl;
+    }
+
+    if (!areVectorsEqual(results, expected1))
+    {
+        return;
+    }
+
+    results.clear();
+
+    if (options.beVerbose())
+    {
+        cout << "Testing string \"" << test2 << "\"" << endl;
+    }
+
+    Util::split(test2, ':', results, Util::SplitModeQuoted);
+
+    if (options.beVerbose())
+    {
+        cout << "Split result: ";
+        printVector(results);
+        cout << endl << "Expected: ";
+        printVector(expected2);
+        cout << endl;
+    }
+
+    if (!areVectorsEqual(results, expected2))
+    {
+        return;
+    }
+
+    pass_ = true;
+}
diff --git a/src/libmatrix/test/util_split_test.h b/src/libmatrix/test/util_split_test.h
new file mode 100644
index 0000000..a8023ff
--- /dev/null
+++ b/src/libmatrix/test/util_split_test.h
@@ -0,0 +1,31 @@
+//
+// Copyright (c) 2012 Linaro Limited
+//
+// All rights reserved. This program and the accompanying materials
+// are made available under the terms of the MIT License which accompanies
+// this distribution, and is available at
+// http://www.opensource.org/licenses/mit-license.php
+//
+// Contributors:
+//     Alexandros Frantzis - original implementation.
+//
+#ifndef UTIL_SPLIT_TEST_H_
+#define UTIL_SPLIT_TEST_H_
+
+class MatrixTest;
+class Options;
+
+class UtilSplitTestNormal : public MatrixTest
+{
+public:
+    UtilSplitTestNormal() : MatrixTest("Util::split::normal") {}
+    virtual void run(const Options& options);
+};
+
+class UtilSplitTestQuoted : public MatrixTest
+{
+public:
+    UtilSplitTestQuoted() : MatrixTest("Util::split::quoted") {}
+    virtual void run(const Options& options);
+};
+#endif // UTIL_SPLIT_TEST_H_
diff --git a/src/libmatrix/util.cc b/src/libmatrix/util.cc
new file mode 100644
index 0000000..d96f393
--- /dev/null
+++ b/src/libmatrix/util.cc
@@ -0,0 +1,343 @@
+//
+// Copyright (c) 2010-2011 Linaro Limited
+//
+// All rights reserved. This program and the accompanying materials
+// are made available under the terms of the MIT License which accompanies
+// this distribution, and is available at
+// http://www.opensource.org/licenses/mit-license.php
+//
+// Contributors:
+//     Alexandros Frantzis <alexandros.frantzis@linaro.org>
+//     Jesse Barker <jesse.barker@linaro.org>
+//
+#include <sstream>
+#include <fstream>
+#include <sys/time.h>
+#ifdef ANDROID
+#include <android/asset_manager.h>
+#else
+#include <dirent.h>
+#endif
+
+#include "log.h"
+#include "util.h"
+
+using std::string;
+using std::vector;
+
+/*
+ * State machine for bash-like quoted string escaping:
+ *
+ *         \
+ *    -----------> +---------+
+ *    | ---------- | Escaped |
+ *    | |  *,ESC   +---------+
+ *    | |
+ *    | v      '
+ * +--------+ ---> +--------------+ -----
+ * | Normal | <--- | SingleQuoted |     | *, ESC
+ * +--------+  '   +--------------+ <----
+ *    | ^
+ *    | |
+ *    | |  "       +--------------+ ----
+ *    | ---------- | DoubleQuoted |    | *, ESC
+ *    -----------> +--------------+ <---
+ *         "             | ^
+ *                     \ | | *, ESC
+ *                       v |
+ *             +---------------------+
+ *             | DoubleQuotedEscaped |
+ *             +---------------------+
+ *
+ * ESC: Mark character as Escaped
+ */
+static void
+fill_escape_vector(const string &str, vector<bool> &esc_vec)
+{
+    enum State {
+        StateNormal,
+        StateEscaped,
+        StateDoubleQuoted,
+        StateDoubleQuotedEscaped,
+        StateSingleQuoted
+    };
+
+    State state = StateNormal;
+
+    for (string::const_iterator iter = str.begin();
+         iter != str.end();
+         iter++)
+    {
+        const char c(*iter);
+        bool esc = false;
+
+        switch (state) {
+            case StateNormal:
+                if (c == '"')
+                    state = StateDoubleQuoted;
+                else if (c == '\\')
+                    state = StateEscaped;
+                else if (c == '\'')
+                    state = StateSingleQuoted;
+                break;
+            case StateEscaped:
+                esc = true;
+                state = StateNormal;
+                break;
+            case StateDoubleQuoted:
+                if (c == '"')
+                    state = StateNormal;
+                else if (c == '\\')
+                    state = StateDoubleQuotedEscaped;
+                else
+                    esc = true;
+                break;
+            case StateDoubleQuotedEscaped:
+                esc = true;
+                state = StateDoubleQuoted;
+                break;
+            case StateSingleQuoted:
+                if (c == '\'')
+                    state = StateNormal;
+                else
+                    esc = true;
+            default:
+                break;
+        }
+
+        esc_vec.push_back(esc);
+    }
+}
+
+static void
+split_normal(const string& src, char delim, vector<string>& elementVec)
+{
+    std::stringstream ss(src);
+    string item;
+    while(std::getline(ss, item, delim))
+        elementVec.push_back(item);
+}
+
+static void
+split_fuzzy(const string& src, char delim, vector<string>& elementVec)
+{
+    // Fuzzy case: Initialize our delimiter string based upon the caller's plus
+    // a space to allow for more flexibility.
+    string delimiter(" ");
+    delimiter += delim;
+    // Starting index into the string of the first token (by definition, if
+    // we're parsing a string, there is at least one token).
+    string::size_type startPos(0);
+    // string::find_first_of() looks for any character in the string provided,
+    // it is not treated as a sub-string, so regardless of where the space or
+    // comma is or how many there are, the result is the same.
+    string str(src);
+    string::size_type endPos = str.find_first_of(delimiter);
+    while (endPos != string::npos)
+    {
+        // Push back the current element starting at startPos for
+        // (endPos - startPos) characters.  std::string takes care of
+        // terminators, etc.
+        elementVec.push_back(string(str, startPos, endPos - startPos));
+        // Index of the next element after any delimiter characters.  Same
+        // caveat applies to find_first_not_of() that applies to
+        // find_first_of(); endPos tells it where to start the search. 
+        string::size_type nextPos = str.find_first_not_of(delimiter, endPos);
+        // Erase the part of the string we've already parsed.
+        str = str.erase(startPos, nextPos - startPos);
+        // Look for the next delimiter.  If there isn't one, we bail out.
+        endPos = str.find_first_of(delimiter);
+    }
+    // Regardless of whether we initially had one element or many, 'str' now
+    // only contains one.
+    elementVec.push_back(str);
+}
+
+static void
+split_quoted(const string& src, char delim, vector<string>& elementVec)
+{
+    std::stringstream ss;
+    vector<bool> escVec;
+
+    /* Mark characters in the string as escaped or not */
+    fill_escape_vector(src, escVec);
+
+    /* Sanity check... */
+    if (src.length() != escVec.size())
+        return;
+
+    for (vector<bool>::const_iterator iter = escVec.begin();
+         iter != escVec.end();
+         iter++)
+    {
+        bool escaped = static_cast<bool>(*iter);
+        char c = src[iter - escVec.begin()];
+
+        /* Output all characters, except unescaped ",\,' */
+        if ((c != '"' && c != '\\' && c != '\'') || escaped) {
+            /* If we reach an unescaped delimiter character, do a split */
+            if (c == delim && !escaped) {
+                elementVec.push_back(ss.str());
+                ss.str("");
+                ss.clear();
+            }
+            else {
+                ss << c;
+            }
+        }
+
+    }
+
+    /* Handle final element, delimited by end of string */
+    const string &finalElement(ss.str());
+    if (!finalElement.empty())
+        elementVec.push_back(finalElement);
+}
+
+void
+Util::split(const string& src, char delim, vector<string>& elementVec,
+            Util::SplitMode mode)
+{
+    // Trivial rejection
+    if (src.empty())
+    {
+        return;
+    }
+
+    switch (mode)
+    {
+        case Util::SplitModeNormal:
+            return split_normal(src, delim, elementVec);
+        case Util::SplitModeFuzzy:
+            return split_fuzzy(src, delim, elementVec);
+        case Util::SplitModeQuoted:
+            return split_quoted(src, delim, elementVec);
+        default:
+            break;
+    }
+}
+
+uint64_t
+Util::get_timestamp_us()
+{
+    struct timeval tv;
+    gettimeofday(&tv, NULL);
+    uint64_t now = static_cast<uint64_t>(tv.tv_sec) * 1000000 +
+                   static_cast<double>(tv.tv_usec);
+    return now;
+}
+
+std::string
+Util::appname_from_path(const std::string& path)
+{
+    std::string::size_type slashPos = path.rfind("/");
+    std::string::size_type startPos(0);
+    if (slashPos != std::string::npos)
+    {
+        startPos = slashPos + 1;
+    }
+    return std::string(path, startPos, std::string::npos);
+}
+
+#ifndef ANDROID
+
+std::istream *
+Util::get_resource(const std::string &path)
+{
+    std::ifstream *ifs = new std::ifstream(path.c_str());
+
+    return static_cast<std::istream *>(ifs);
+}
+
+void
+Util::list_files(const std::string& dirName, std::vector<std::string>& fileVec)
+{
+    DIR* dir = opendir(dirName.c_str());
+    if (!dir)
+    {
+        Log::error("Failed to open models directory '%s'\n", dirName.c_str());
+        return;
+    }
+
+    struct dirent* entry = readdir(dir);
+    while (entry)
+    {
+        std::string pathname(dirName + "/");
+        pathname += std::string(entry->d_name);
+        // Skip '.' and '..'
+        if (entry->d_name[0] != '.')
+        {
+            fileVec.push_back(pathname);
+        }
+        entry = readdir(dir);
+    }
+    closedir(dir);
+}
+
+#else
+
+AAssetManager *Util::android_asset_manager = 0;
+
+void
+Util::android_set_asset_manager(AAssetManager *asset_manager)
+{
+    Util::android_asset_manager = asset_manager;
+}
+
+AAssetManager *
+Util::android_get_asset_manager()
+{
+    return Util::android_asset_manager;
+}
+
+std::istream *
+Util::get_resource(const std::string &path)
+{
+    std::string path2(path);
+    /* Remove leading '/' from path name, it confuses the AssetManager */
+    if (path2.size() > 0 && path2[0] == '/')
+        path2.erase(0, 1);
+
+    std::stringstream *ss = new std::stringstream;
+    AAsset *asset = AAssetManager_open(Util::android_asset_manager,
+                                       path2.c_str(), AASSET_MODE_RANDOM);
+    if (asset) {
+        ss->write(reinterpret_cast<const char *>(AAsset_getBuffer(asset)),
+                  AAsset_getLength(asset));
+        Log::debug("Load asset %s\n", path2.c_str());
+        AAsset_close(asset);
+    }
+    else {
+        Log::error("Couldn't load asset %s\n", path2.c_str());
+    }
+
+    return static_cast<std::istream *>(ss);
+}
+
+void
+Util::list_files(const std::string& dirName, std::vector<std::string>& fileVec)
+{
+    AAssetManager *mgr(Util::android_get_asset_manager());
+    std::string dir_name(dirName);
+
+    /* Remove leading '/' from path, it confuses the AssetManager */
+    if (dir_name.size() > 0 && dir_name[0] == '/')
+        dir_name.erase(0, 1);
+
+    AAssetDir* dir = AAssetManager_openDir(mgr, dir_name.c_str());
+    if (!dir)
+    {
+        Log::error("Failed to open models directory '%s'\n", dir_name.c_str());
+        return;
+    }
+
+    const char *filename(0);
+    while ((filename = AAssetDir_getNextFileName(dir)) != 0)
+    {
+        std::string pathname(dir_name + "/");
+        pathname += std::string(filename);
+        fileVec.push_back(pathname);
+    }
+    AAssetDir_close(dir);
+}
+#endif
diff --git a/src/libmatrix/util.h b/src/libmatrix/util.h
new file mode 100644
index 0000000..2b0f0f0
--- /dev/null
+++ b/src/libmatrix/util.h
@@ -0,0 +1,142 @@
+//
+// Copyright (c) 2010-2011 Linaro Limited
+//
+// All rights reserved. This program and the accompanying materials
+// are made available under the terms of the MIT License which accompanies
+// this distribution, and is available at
+// http://www.opensource.org/licenses/mit-license.php
+//
+// Contributors:
+//     Alexandros Frantzis <alexandros.frantzis@linaro.org>
+//     Jesse Barker <jesse.barker@linaro.org>
+//
+#ifndef UTIL_H_
+#define UTIL_H_
+
+#include <string>
+#include <vector>
+#include <istream>
+#include <sstream>
+#include <stdint.h>
+
+#ifdef ANDROID
+#include <android/asset_manager_jni.h>
+#endif
+
+struct Util {
+    /**
+     * How to perform the split() operation
+     */
+    enum SplitMode {
+        /** Normal split operation */
+        SplitModeNormal,
+        /** Allow for spaces and multiple consecutive occurences of the delimiter */
+        SplitModeFuzzy,
+        /** Take into account bash-like quoting and escaping rules */
+        SplitModeQuoted
+    };
+
+    /**
+     * split() - Splits a string into elements using a provided delimiter
+     *
+     * @s:          the string to split
+     * @delim:      the delimiter to use
+     * @elems:      the string vector to populate
+     * @mode:       the SplitMode to use
+     *
+     * Using @delim to determine field boundaries, splits @s into separate
+     * string elements.  These elements are returned in the string vector
+     * @elems. As long as @s is non-empty, there will be at least one
+     * element in @elems.
+     */
+    static void split(const std::string& src, char delim,
+                      std::vector<std::string>& elems,
+                      Util::SplitMode mode);
+    /**
+     * get_timestamp_us() - Returns the current time in microseconds
+     */
+    static uint64_t get_timestamp_us();
+    /**
+     * get_resource() - Gets an input filestream for a given file.
+     *
+     * @path:       the path to the file
+     *
+     * Returns a pointer to an input stream, which must be deleted when no
+     * longer in use.
+     */
+    static std::istream *get_resource(const std::string &path);
+    /**
+     * list_files() - Get a list of the files in a given directory.
+     *
+     * @dirName:    the directory path to be listed.
+     * @fileVec:    the string vector to populate.
+     *
+     * Obtains a list of the files in @dirName, and returns them in the string
+     * vector @fileVec.
+     */
+    static void list_files(const std::string& dirName, std::vector<std::string>& fileVec);
+    /**
+     * dispose_pointer_vector() - cleans up a vector of pointers
+     *
+     * @vec:        vector of pointers to objects or plain-old-data
+     *
+     * Iterates across @vec and deletes the data pointed to by each of the
+     * elements.  Clears the vector, resetting it for reuse.
+     */
+    template <class T> static void dispose_pointer_vector(std::vector<T*> &vec)
+    {
+        for (typename std::vector<T*>::const_iterator iter = vec.begin();
+             iter != vec.end();
+             iter++)
+        {
+            delete *iter;
+        }
+
+        vec.clear();
+    }
+    /**
+     * toString() - Converts a string to a plain-old-data type.
+     *
+     * @asString:   a string representation of plain-old-data.
+     */
+    template<typename T>
+    static T
+    fromString(const std::string& asString)
+    {
+        std::stringstream ss(asString);
+        T retVal = T();
+        ss >> retVal;
+        return retVal;
+    }
+    /**
+     * toString() - Converts a plain-old-data type to a string.
+     *
+     * @t:      a simple value to be converted to a string
+     */
+    template<typename T>
+    static std::string
+    toString(const T t)
+    {
+        std::stringstream ss;
+        ss << t;
+        return ss.str();
+    }
+    /**
+     * appname_from_path() - get the name of an executable from an absolute path
+     *
+     * @path:   absolute path of the running application (argv[0])
+     *
+     * Returns the last portion of @path (everything after the final '/').
+     */
+    static std::string
+    appname_from_path(const std::string& path);
+
+#ifdef ANDROID
+    static void android_set_asset_manager(AAssetManager *asset_manager);
+    static AAssetManager *android_get_asset_manager(void);
+private:
+    static AAssetManager *android_asset_manager;
+#endif
+};
+
+#endif /* UTIL_H */
diff --git a/src/libmatrix/vec.h b/src/libmatrix/vec.h
new file mode 100644
index 0000000..2680ebc
--- /dev/null
+++ b/src/libmatrix/vec.h
@@ -0,0 +1,716 @@
+//
+// Copyright (c) 2010-2011 Linaro Limited
+//
+// All rights reserved. This program and the accompanying materials
+// are made available under the terms of the MIT License which accompanies
+// this distribution, and is available at
+// http://www.opensource.org/licenses/mit-license.php
+//
+// Contributors:
+//     Jesse Barker - original implementation.
+//
+#ifndef VEC_H_
+#define VEC_H_
+
+#include <iostream> // only needed for print() functions...
+#include <math.h>
+
+namespace LibMatrix
+{
+// A template class for creating, managing and operating on a 2-element vector
+// of any type you like (intended for built-in types, but as long as it 
+// supports the basic arithmetic and assignment operators, any type should
+// work).
+template<typename T>
+class tvec2
+{
+public:
+    tvec2() :
+        x_(0),
+        y_(0) {}
+    tvec2(const T t) :
+        x_(t),
+        y_(t) {}
+    tvec2(const T x, const T y) :
+        x_(x),
+        y_(y) {}
+    tvec2(const tvec2& v) :
+        x_(v.x_),
+        y_(v.y_) {}
+    ~tvec2() {}
+
+    // Print the elements of the vector to standard out.
+    // Really only useful for debug and test.
+    void print() const
+    {
+        std::cout << "| " << x_ << " " << y_ << " |" << std::endl;
+    }
+
+    // Allow raw data access for API calls and the like.
+    // For example, it is valid to pass a tvec2<float> into a call to
+    // the OpenGL command "glUniform2fv()".
+    operator const T*() const { return &x_;}
+
+    // Get and set access members for the individual elements.
+    const T x() const { return x_; }
+    const T y() const { return y_; }
+
+    void x(const T& val) { x_ = val; }
+    void y(const T& val) { y_ = val; }
+
+    // A direct assignment of 'rhs' to this.  Return a reference to this.
+    tvec2& operator=(const tvec2& rhs)
+    {
+        if (this != &rhs)
+        {
+            x_ = rhs.x_;
+            y_ = rhs.y_;
+        }
+        return *this;
+    }
+
+    // Divide this by a scalar.  Return a reference to this.
+    tvec2& operator/=(const T& rhs)
+    {
+        x_ /= rhs;
+        y_ /= rhs;
+        return *this;
+    }
+
+    // Divide a copy of this by a scalar.  Return the copy.
+    const tvec2 operator/(const T& rhs) const
+    {
+        return tvec2(*this) /= rhs;
+    }
+
+    // Component-wise divide of this by another vector.
+    // Return a reference to this.
+    tvec2& operator/=(const tvec2& rhs)
+    {
+        x_ /= rhs.x_;
+        y_ /= rhs.y_;
+        return *this;
+    }
+
+    // Component-wise divide of a copy of this by another vector.
+    // Return the copy.
+    const tvec2 operator/(const tvec2& rhs) const
+    {
+        return tvec2(*this) /= rhs;
+    }
+
+    // Multiply this by a scalar.  Return a reference to this.
+    tvec2& operator*=(const T& rhs)
+    {
+        x_ *= rhs;
+        y_ *= rhs;
+        return *this;
+    }
+
+    // Multiply a copy of this by a scalar.  Return the copy.
+    const tvec2 operator*(const T& rhs) const
+    {
+        return tvec2(*this) *= rhs;
+    }
+
+    // Component-wise multiply of this by another vector.
+    // Return a reference to this.
+    tvec2& operator*=(const tvec2& rhs)
+    {
+        x_ *= rhs.x_;
+        y_ *= rhs.y_;
+        return *this;
+    }
+
+    // Component-wise multiply of a copy of this by another vector.
+    // Return the copy.
+    const tvec2 operator*(const tvec2& rhs) const
+    {
+        return tvec2(*this) *= rhs;
+    }
+
+    // Add a scalar to this.  Return a reference to this.
+    tvec2& operator+=(const T& rhs)
+    {
+        x_ += rhs;
+        y_ += rhs;
+        return *this;
+    }
+    
+    // Add a scalar to a copy of this.  Return the copy.
+    const tvec2 operator+(const T& rhs) const
+    {
+        return tvec2(*this) += rhs;
+    }
+
+    // Component-wise addition of another vector to this.
+    // Return a reference to this.
+    tvec2& operator+=(const tvec2& rhs)
+    {
+        x_ += rhs.x_;
+        y_ += rhs.y_;
+        return *this;
+    }
+
+    // Component-wise addition of another vector to a copy of this.
+    // Return the copy.
+    const tvec2 operator+(const tvec2& rhs) const
+    {
+        return tvec2(*this) += rhs;
+    }
+
+    // Subtract a scalar from this.  Return a reference to this.
+    tvec2& operator-=(const T& rhs)
+    {
+        x_ -= rhs;
+        y_ -= rhs;
+        return *this;
+    }
+    
+    // Subtract a scalar from a copy of this.  Return the copy.
+    const tvec2 operator-(const T& rhs) const
+    {
+        return tvec2(*this) -= rhs;
+    }
+
+    // Component-wise subtraction of another vector from this.
+    // Return a reference to this.
+    tvec2& operator-=(const tvec2& rhs)
+    {
+        x_ -= rhs.x_;
+        y_ -= rhs.y_;
+        return *this;
+    }
+
+    // Component-wise subtraction of another vector from a copy of this.
+    // Return the copy.
+    const tvec2 operator-(const tvec2& rhs) const
+    {
+        return tvec2(*this) -= rhs;
+    }
+
+    // Compute the length of this and return it.
+    float length() const
+    {
+        return sqrt(dot(*this, *this));
+    }
+
+    // Make this a unit vector.
+    void normalize()
+    {
+        float l = length();
+        x_ /= l;
+        y_ /= l;
+    }
+
+    // Compute the dot product of two vectors.
+    static T dot(const tvec2& v1, const tvec2& v2)
+    {
+        return (v1.x_ * v2.x_) + (v1.y_ * v2.y_); 
+    }
+
+private:
+    T x_;
+    T y_;
+};
+
+// A template class for creating, managing and operating on a 3-element vector
+// of any type you like (intended for built-in types, but as long as it 
+// supports the basic arithmetic and assignment operators, any type should
+// work).
+template<typename T>
+class tvec3
+{
+public:
+    tvec3() :
+        x_(0),
+        y_(0),
+        z_(0) {}
+    tvec3(const T t) :
+        x_(t),
+        y_(t),
+        z_(t) {}
+    tvec3(const T x, const T y, const T z) :
+        x_(x),
+        y_(y),
+        z_(z) {}
+    tvec3(const tvec3& v) :
+        x_(v.x_),
+        y_(v.y_),
+        z_(v.z_) {}
+    ~tvec3() {}
+
+    // Print the elements of the vector to standard out.
+    // Really only useful for debug and test.
+    void print() const
+    {
+        std::cout << "| " << x_ << " " << y_ << " " << z_ << " |" << std::endl;
+    }
+
+    // Allow raw data access for API calls and the like.
+    // For example, it is valid to pass a tvec3<float> into a call to
+    // the OpenGL command "glUniform3fv()".
+    operator const T*() const { return &x_;}
+
+    // Get and set access members for the individual elements.
+    const T x() const { return x_; }
+    const T y() const { return y_; }
+    const T z() const { return z_; }
+
+    void x(const T& val) { x_ = val; }
+    void y(const T& val) { y_ = val; }
+    void z(const T& val) { z_ = val; }
+
+    // A direct assignment of 'rhs' to this.  Return a reference to this.
+    tvec3& operator=(const tvec3& rhs)
+    {
+        if (this != &rhs)
+        {
+            x_ = rhs.x_;
+            y_ = rhs.y_;
+            z_ = rhs.z_;
+        }
+        return *this;
+    }
+
+    // Divide this by a scalar.  Return a reference to this.
+    tvec3& operator/=(const T& rhs)
+    {
+        x_ /= rhs;
+        y_ /= rhs;
+        z_ /= rhs;
+        return *this;
+    }
+
+    // Divide a copy of this by a scalar.  Return the copy.
+    const tvec3 operator/(const T& rhs) const
+    {
+        return tvec3(*this) /= rhs;
+    }
+
+    // Component-wise divide of this by another vector.
+    // Return a reference to this.
+    tvec3& operator/=(const tvec3& rhs)
+    {
+        x_ /= rhs.x_;
+        y_ /= rhs.y_;
+        z_ /= rhs.z_;
+        return *this;
+    }
+
+    // Component-wise divide of a copy of this by another vector.
+    // Return the copy.
+    const tvec3 operator/(const tvec3& rhs) const
+    {
+        return tvec3(*this) /= rhs;
+    }
+
+    // Multiply this by a scalar.  Return a reference to this.
+    tvec3& operator*=(const T& rhs)
+    {
+        x_ *= rhs;
+        y_ *= rhs;
+        z_ *= rhs;
+        return *this;
+    }
+
+    // Multiply a copy of this by a scalar.  Return the copy.
+    const tvec3 operator*(const T& rhs) const
+    {
+        return tvec3(*this) *= rhs;
+    }
+
+    // Component-wise multiply of this by another vector.
+    // Return a reference to this.
+    tvec3& operator*=(const tvec3& rhs)
+    {
+        x_ *= rhs.x_;
+        y_ *= rhs.y_;
+        z_ *= rhs.z_;
+        return *this;
+    }
+
+    // Component-wise multiply of a copy of this by another vector.
+    // Return the copy.
+    const tvec3 operator*(const tvec3& rhs) const
+    {
+        return tvec3(*this) *= rhs;
+    }
+
+    // Add a scalar to this.  Return a reference to this.
+    tvec3& operator+=(const T& rhs)
+    {
+        x_ += rhs;
+        y_ += rhs;
+        z_ += rhs;
+        return *this;
+    }
+
+    // Add a scalar to a copy of this.  Return the copy.
+    const tvec3 operator+(const T& rhs) const
+    {
+        return tvec3(*this) += rhs;
+    }
+
+    // Component-wise addition of another vector to this.
+    // Return a reference to this.
+    tvec3& operator+=(const tvec3& rhs)
+    {
+        x_ += rhs.x_;
+        y_ += rhs.y_;
+        z_ += rhs.z_;
+        return *this;
+    }
+
+    // Component-wise addition of another vector to a copy of this.
+    // Return the copy.
+    const tvec3 operator+(const tvec3& rhs) const
+    {
+        return tvec3(*this) += rhs;
+    }
+
+    // Subtract a scalar from this.  Return a reference to this.
+    tvec3& operator-=(const T& rhs)
+    {
+        x_ -= rhs;
+        y_ -= rhs;
+        z_ -= rhs;
+        return *this;
+    }
+
+    // Subtract a scalar from a copy of this.  Return the copy.
+    const tvec3 operator-(const T& rhs) const
+    {
+        return tvec3(*this) -= rhs;
+    }
+
+    // Component-wise subtraction of another vector from this.
+    // Return a reference to this.
+    tvec3& operator-=(const tvec3& rhs)
+    {
+        x_ -= rhs.x_;
+        y_ -= rhs.y_;
+        z_ -= rhs.z_;
+        return *this;
+    }
+
+    // Component-wise subtraction of another vector from a copy of this.
+    // Return the copy.
+    const tvec3 operator-(const tvec3& rhs) const
+    {
+        return tvec3(*this) -= rhs;
+    }
+
+    // Compute the length of this and return it.
+    float length() const
+    {
+        return sqrt(dot(*this, *this));
+    }
+
+    // Make this a unit vector.
+    void normalize()
+    {
+        float l = length();
+        x_ /= l;
+        y_ /= l;
+        z_ /= l;
+    }
+
+    // Compute the dot product of two vectors.
+    static T dot(const tvec3& v1, const tvec3& v2)
+    {
+        return (v1.x_ * v2.x_) + (v1.y_ * v2.y_) + (v1.z_ * v2.z_); 
+    }
+
+    // Compute the cross product of two vectors.
+    static tvec3 cross(const tvec3& u, const tvec3& v)
+    {
+        return tvec3((u.y_ * v.z_) - (u.z_ * v.y_),
+                    (u.z_ * v.x_) - (u.x_ * v.z_),
+                    (u.x_ * v.y_) - (u.y_ * v.x_));
+    }
+
+private:
+    T x_;
+    T y_;
+    T z_;
+};
+
+// A template class for creating, managing and operating on a 4-element vector
+// of any type you like (intended for built-in types, but as long as it 
+// supports the basic arithmetic and assignment operators, any type should
+// work).
+template<typename T>
+class tvec4
+{
+public:
+    tvec4() :
+        x_(0),
+        y_(0),
+        z_(0),
+        w_(0) {}
+    tvec4(const T t) :
+        x_(t),
+        y_(t),
+        z_(t),
+        w_(t) {}
+    tvec4(const T x, const T y, const T z, const T w) :
+        x_(x),
+        y_(y),
+        z_(z),
+        w_(w) {}
+    tvec4(const tvec4& v) :
+        x_(v.x_),
+        y_(v.y_),
+        z_(v.z_),
+        w_(v.w_) {}
+    ~tvec4() {}
+
+    // Print the elements of the vector to standard out.
+    // Really only useful for debug and test.
+    void print() const
+    {
+        std::cout << "| " << x_ << " " << y_ << " " << z_ << " " << w_ << " |" << std::endl;
+    }
+
+    // Allow raw data access for API calls and the like.
+    // For example, it is valid to pass a tvec4<float> into a call to
+    // the OpenGL command "glUniform4fv()".
+    operator const T*() const { return &x_;}
+
+    // Get and set access members for the individual elements.
+    const T x() const { return x_; }
+    const T y() const { return y_; }
+    const T z() const { return z_; }
+    const T w() const { return w_; }
+
+    void x(const T& val) { x_ = val; }
+    void y(const T& val) { y_ = val; }
+    void z(const T& val) { z_ = val; }
+    void w(const T& val) { w_ = val; }
+
+    // A direct assignment of 'rhs' to this.  Return a reference to this.
+    tvec4& operator=(const tvec4& rhs)
+    {
+        if (this != &rhs)
+        {
+            x_ = rhs.x_;
+            y_ = rhs.y_;
+            z_ = rhs.z_;
+            w_ = rhs.w_;
+        }
+        return *this;
+    }
+
+    // Divide this by a scalar.  Return a reference to this.
+    tvec4& operator/=(const T& rhs)
+    {
+        x_ /= rhs;
+        y_ /= rhs;
+        z_ /= rhs;
+        w_ /= rhs;
+        return *this;
+    }
+
+    // Divide a copy of this by a scalar.  Return the copy.
+    const tvec4 operator/(const T& rhs) const
+    {
+        return tvec4(*this) /= rhs;
+    }
+
+    // Component-wise divide of this by another vector.
+    // Return a reference to this.
+    tvec4& operator/=(const tvec4& rhs)
+    {
+        x_ /= rhs.x_;
+        y_ /= rhs.y_;
+        z_ /= rhs.z_;
+        w_ /= rhs.w_;
+        return *this;
+    }
+
+    // Component-wise divide of a copy of this by another vector.
+    // Return the copy.
+    const tvec4 operator/(const tvec4& rhs) const
+    {
+        return tvec4(*this) /= rhs;
+    }
+
+    // Multiply this by a scalar.  Return a reference to this.
+    tvec4& operator*=(const T& rhs)
+    {
+        x_ *= rhs;
+        y_ *= rhs;
+        z_ *= rhs;
+        w_ *= rhs;
+        return *this;
+    }
+
+    // Multiply a copy of this by a scalar.  Return the copy.
+    const tvec4 operator*(const T& rhs) const
+    {
+        return tvec4(*this) *= rhs;
+    }
+
+    // Component-wise multiply of this by another vector.
+    // Return a reference to this.
+    tvec4& operator*=(const tvec4& rhs)
+    {
+        x_ *= rhs.x_;
+        y_ *= rhs.y_;
+        z_ *= rhs.z_;
+        w_ *= rhs.w_;
+        return *this;
+    }
+
+    // Component-wise multiply of a copy of this by another vector.
+    // Return the copy.
+    const tvec4 operator*(const tvec4& rhs) const
+    {
+        return tvec4(*this) *= rhs;
+    }
+
+    // Add a scalar to this.  Return a reference to this.
+    tvec4& operator+=(const T& rhs)
+    {
+        x_ += rhs;
+        y_ += rhs;
+        z_ += rhs;
+        w_ += rhs;
+        return *this;
+    }
+
+    // Add a scalar to a copy of this.  Return the copy.
+    const tvec4 operator+(const T& rhs) const
+    {
+        return tvec4(*this) += rhs;
+    }
+
+    // Component-wise addition of another vector to this.
+    // Return a reference to this.
+    tvec4& operator+=(const tvec4& rhs)
+    {
+        x_ += rhs.x_;
+        y_ += rhs.y_;
+        z_ += rhs.z_;
+        w_ += rhs.w_;
+        return *this;
+    }
+
+    // Component-wise addition of another vector to a copy of this.
+    // Return the copy.
+    const tvec4 operator+(const tvec4& rhs) const
+    {
+        return tvec4(*this) += rhs;
+    }
+
+    // Subtract a scalar from this.  Return a reference to this.
+    tvec4& operator-=(const T& rhs)
+    {
+        x_ -= rhs;
+        y_ -= rhs;
+        z_ -= rhs;
+        w_ -= rhs;
+        return *this;
+    }
+
+    // Subtract a scalar from a copy of this.  Return the copy.
+    const tvec4 operator-(const T& rhs) const
+    {
+        return tvec4(*this) -= rhs;
+    }
+
+    // Component-wise subtraction of another vector from this.
+    // Return a reference to this.
+    tvec4& operator-=(const tvec4& rhs)
+    {
+        x_ -= rhs.x_;
+        y_ -= rhs.y_;
+        z_ -= rhs.z_;
+        w_ -= rhs.w_;
+        return *this;
+    }
+
+    // Component-wise subtraction of another vector from a copy of this.
+    // Return the copy.
+    const tvec4 operator-(const tvec4& rhs) const
+    {
+        return tvec4(*this) -= rhs;
+    }
+
+    // Compute the length of this and return it.
+    float length() const
+    {
+        return sqrt(dot(*this, *this));
+    }
+
+    // Make this a unit vector.
+    void normalize()
+    {
+        float l = length();
+        x_ /= l;
+        y_ /= l;
+        z_ /= l;
+        w_ /= l;
+    }
+
+    // Compute the dot product of two vectors.
+    static T dot(const tvec4& v1, const tvec4& v2)
+    {
+        return (v1.x_ * v2.x_) + (v1.y_ * v2.y_) + (v1.z_ * v2.z_) + (v1.w_ * v2.w_); 
+    }
+
+private:
+    T x_;
+    T y_;
+    T z_;
+    T w_;
+};
+
+//
+// Convenience typedefs.  These are here to present a homogeneous view of these
+// objects with respect to shader source.
+//
+typedef tvec2<float> vec2;
+typedef tvec3<float> vec3;
+typedef tvec4<float> vec4;
+
+typedef tvec2<double> dvec2;
+typedef tvec3<double> dvec3;
+typedef tvec4<double> dvec4;
+
+typedef tvec2<int> ivec2;
+typedef tvec3<int> ivec3;
+typedef tvec4<int> ivec4;
+
+typedef tvec2<unsigned int> uvec2;
+typedef tvec3<unsigned int> uvec3;
+typedef tvec4<unsigned int> uvec4;
+
+typedef tvec2<bool> bvec2;
+typedef tvec3<bool> bvec3;
+typedef tvec4<bool> bvec4;
+
+} // namespace LibMatrix
+
+// Global operators to allow for things like defining a new vector in terms of
+// a product of a scalar and a vector
+template<typename T>
+const LibMatrix::tvec2<T> operator*(const T t, const LibMatrix::tvec2<T>& v)
+{
+    return v * t;
+}
+
+template<typename T>
+const LibMatrix::tvec3<T> operator*(const T t, const LibMatrix::tvec3<T>& v)
+{
+    return v * t;
+}
+
+template<typename T>
+const LibMatrix::tvec4<T> operator*(const T t, const LibMatrix::tvec4<T>& v)
+{
+    return v * t;
+}
+
+#endif // VEC_H_
diff --git a/src/libpng/ANNOUNCE b/src/libpng/ANNOUNCE
new file mode 100644
index 0000000..02a24bd
--- /dev/null
+++ b/src/libpng/ANNOUNCE
@@ -0,0 +1,65 @@
+
+Libpng 1.2.46 - July 9, 2011
+
+This is a public release of libpng, intended for use in production codes.
+
+Files available for download:
+
+Source files with LF line endings (for Unix/Linux) and with a
+"configure" script
+
+   libpng-1.2.46.tar.xz (LZMA-compressed, recommended)
+   libpng-1.2.46.tar.gz
+   libpng-1.2.46.tar.bz2
+
+Source files with LF line endings (for Unix/Linux) without the
+"configure" script
+
+   libpng-1.2.46-no-config.tar.xz (LZMA-compressed, recommended)
+   libpng-1.2.46-no-config.tar.gz
+   libpng-1.2.46-no-config.tar.bz2
+
+Source files with CRLF line endings (for Windows), without the
+"configure" script
+
+   lpng1246.zip
+   lpng1246.7z
+   lpng1246.tar.bz2
+
+Project files
+
+   libpng-1.2.46-project-netware.zip
+   libpng-1.2.46-project-wince.zip
+
+Other information:
+
+   libpng-1.2.46-README.txt
+   libpng-1.2.46-KNOWNBUGS.txt
+   libpng-1.2.46-LICENSE.txt
+   libpng-1.2.46-Y2K-compliance.txt
+   libpng-1.2.46-[previous version]-diff.txt
+
+Changes since the last public release (1.2.43):
+
+version 1.2.45 [July 9, 2011]
+
+  Fixed uninitialized memory read in png_format_buffer() (Bug
+    report by Frank Busse, related to CVE-2004-0421).
+  Pass "" instead of '\0' to png_default_error() in png_err().  This mistake
+    was introduced in libpng-1.2.20beta01.
+  Check for up->location !PNG_AFTER_IDAT when writing unknown chunks
+    before IDAT.
+  Ported bugfix in pngrtran.c from 1.5.3: when expanding a paletted image,
+    always expand to RGBA if transparency is present.
+  Check for integer overflow in png_set_rgb_to_gray().
+  Check for sCAL chunk too short.
+  Added CMakeLists.txt, projects/xcode, and pnggccrd.c to EXTRA_DIST in
+    Makefile.am and Makefile.in
+  Udated copyright year to 2011.
+
+Send comments/corrections/commendations to png-mng-implement at lists.sf.net
+(subscription required; visit
+https://lists.sourceforge.net/lists/listinfo/png-mng-implement
+to subscribe) or to glennrp at users.sourceforge.net
+
+Glenn R-P
diff --git a/src/libpng/CMakeLists.txt b/src/libpng/CMakeLists.txt
new file mode 100644
index 0000000..a3ab464
--- /dev/null
+++ b/src/libpng/CMakeLists.txt
@@ -0,0 +1,284 @@
+cmake_minimum_required(VERSION 2.4.3)
+set(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS true)
+
+if(UNIX AND NOT DEFINED CMAKE_BUILD_TYPE)
+  set(CMAKE_BUILD_TYPE "RelWithDebInfo" CACHE STRING 
+      "Choose the type of build, options are:
+         None(CMAKE_CXX_FLAGS or CMAKE_C_FLAGS used)
+         Debug
+         Release
+         RelWithDebInfo
+         MinSizeRel.")
+endif()
+
+project(libpng C)
+enable_testing()
+
+# Copyright (C) 2007-2010 Glenn Randers-Pehrson
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
+
+set(PNGLIB_MAJOR 1)
+set(PNGLIB_MINOR 2)
+set(PNGLIB_RELEASE 46)
+set(PNGLIB_NAME libpng${PNGLIB_MAJOR}${PNGLIB_MINOR})
+set(PNGLIB_VERSION ${PNGLIB_MAJOR}.${PNGLIB_MINOR}.${PNGLIB_RELEASE})
+
+# needed packages
+find_package(ZLIB REQUIRED)
+include_directories(${ZLIB_INCLUDE_DIR})
+
+if(NOT WIN32)
+  find_library(M_LIBRARY
+    NAMES m
+    PATHS /usr/lib /usr/local/lib
+  )
+  if(NOT M_LIBRARY)
+    message(STATUS
+      "math library 'libm' not found - floating point support disabled")
+  endif()
+else()
+  # not needed on windows
+  set(M_LIBRARY "")
+endif()
+
+# COMMAND LINE OPTIONS
+if(DEFINED PNG_SHARED)
+  option(PNG_SHARED "Build shared lib" ${PNG_SHARED})
+else()
+  option(PNG_SHARED "Build shared lib" ON)
+endif()
+if(DEFINED PNG_STATIC)
+  option(PNG_STATIC "Build static lib" ${PNG_STATIC})
+else()
+  option(PNG_STATIC "Build static lib" ON)
+endif()
+
+if(MINGW)
+  option(PNG_TESTS  "Build pngtest" NO)
+else()
+  option(PNG_TESTS  "Build pngtest" YES)
+endif()
+
+option(PNG_NO_CONSOLE_IO "FIXME" YES)
+option(PNG_NO_STDIO      "FIXME" YES)
+option(PNG_DEBUG         "Build with debug output" NO)
+option(PNGARG            "FIXME" YES)
+#TODO:
+# PNG_CONSOLE_IO_SUPPORTED
+
+# maybe needs improving, but currently I don't know when we can enable what :)
+set(png_asm_tmp "OFF")
+if(NOT WIN32)
+  find_program(uname_executable NAMES uname PATHS /bin /usr/bin /usr/local/bin)
+  if(uname_executable)
+    exec_program(${uname_executable}
+                 ARGS --machine OUTPUT_VARIABLE uname_output)
+    if("uname_output" MATCHES "^.*i[1-9]86.*$")
+      set(png_asm_tmp "ON")
+    else("uname_output" MATCHES "^.*i[1-9]86.*$")
+      set(png_asm_tmp "OFF")
+    endif("uname_output" MATCHES "^.*i[1-9]86.*$")
+  endif(uname_executable)
+else()
+  # this env var is normally only set on win64
+  set(TEXT "ProgramFiles(x86)")
+  if("$ENV{${TEXT}}" STREQUAL "")
+    set(png_asm_tmp "ON")
+  endif("$ENV{${TEXT}}" STREQUAL "")
+endif()
+
+# SET LIBNAME
+set(PNG_LIB_NAME png${PNGLIB_MAJOR}${PNGLIB_MINOR})
+
+# to distinguish between debug and release lib
+set(CMAKE_DEBUG_POSTFIX "d")
+
+
+# OUR SOURCES
+set(libpng_sources
+  png.h
+  pngconf.h
+  png.c
+  pngerror.c
+  pngget.c
+  pngmem.c
+  pngpread.c
+  pngread.c
+  pngrio.c
+  pngrtran.c
+  pngrutil.c
+  pngset.c
+  pngtrans.c
+  pngwio.c
+  pngwrite.c
+  pngwtran.c
+  pngwutil.c
+)
+set(pngtest_sources
+  pngtest.c
+)
+# SOME NEEDED DEFINITIONS
+
+add_definitions(-DPNG_CONFIGURE_LIBPNG)
+
+if(_AIX)
+  add_definitions(-D_ALL_SOURCE)
+endif(_AIX)
+
+if(MSVC)
+  add_definitions(-DPNG_NO_MODULEDEF -D_CRT_SECURE_NO_DEPRECATE)
+endif(MSVC)
+
+if(PNG_SHARED OR  NOT MSVC)
+  #if building msvc static this has NOT to be defined
+  add_definitions(-DZLIB_DLL)
+endif()
+
+add_definitions(-DLIBPNG_NO_MMX)
+add_definitions(-DPNG_NO_MMX_CODE)
+
+
+if(PNG_CONSOLE_IO_SUPPORTED)
+  add_definitions(-DPNG_CONSOLE_IO_SUPPORTED)
+endif()
+
+if(PNG_NO_CONSOLE_IO)
+  add_definitions(-DPNG_NO_CONSOLE_IO)
+endif()
+
+if(PNG_NO_STDIO)
+  add_definitions(-DPNG_NO_STDIO)
+endif()
+
+if(PNG_DEBUG)
+  add_definitions(-DPNG_DEBUG)
+endif()
+
+if(NOT M_LIBRARY AND NOT WIN32)
+  add_definitions(-DPNG_NO_FLOATING_POINT_SUPPORTED)
+endif()
+
+# NOW BUILD OUR TARGET
+include_directories(${CMAKE_CURRENT_SOURCE_DIR} ${ZLIB_INCLUDE_DIR})
+
+if(PNG_SHARED)
+  add_library(${PNG_LIB_NAME} SHARED ${libpng_sources})
+  if(MSVC)
+    # msvc does not append 'lib' - do it here to have consistent name
+    set_target_properties(${PNG_LIB_NAME} PROPERTIES PREFIX "lib")
+  endif()
+  target_link_libraries(${PNG_LIB_NAME} ${ZLIB_LIBRARY} ${M_LIBRARY})
+endif()
+
+if(PNG_STATIC)
+# does not work without changing name
+  set(PNG_LIB_NAME_STATIC ${PNG_LIB_NAME}_static)
+  add_library(${PNG_LIB_NAME_STATIC} STATIC ${libpng_sources})
+  if(MSVC)
+    # msvc does not append 'lib' - do it here to have consistent name
+    set_target_properties(${PNG_LIB_NAME_STATIC} PROPERTIES PREFIX "lib")
+  endif()
+endif()
+
+
+if(PNG_SHARED AND WIN32)
+  set_target_properties(${PNG_LIB_NAME} PROPERTIES DEFINE_SYMBOL PNG_BUILD_DLL)
+endif()
+
+if(PNG_TESTS AND PNG_SHARED)
+  # does not work with msvc due to png_lib_ver issue
+  add_executable(pngtest ${pngtest_sources})
+  target_link_libraries(pngtest ${PNG_LIB_NAME})
+  add_test(pngtest pngtest ${CMAKE_CURRENT_SOURCE_DIR}/pngtest.png)
+endif()
+
+
+# CREATE PKGCONFIG FILES
+# we use the same files like ./configure, so we have to set its vars
+set(prefix      ${CMAKE_INSTALL_PREFIX})
+set(exec_prefix ${CMAKE_INSTALL_PREFIX})
+set(libdir      ${CMAKE_INSTALL_PREFIX}/lib)
+set(includedir  ${CMAKE_INSTALL_PREFIX}/include)
+
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/libpng.pc.in
+  ${CMAKE_CURRENT_BINARY_DIR}/libpng.pc)
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/libpng-config.in
+  ${CMAKE_CURRENT_BINARY_DIR}/libpng-config)
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/libpng.pc.in
+  ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}.pc)
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/libpng-config.in
+  ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config)
+
+# SET UP LINKS
+if(PNG_SHARED)
+  set_target_properties(${PNG_LIB_NAME} PROPERTIES
+#   VERSION 0.${PNGLIB_RELEASE}.1.2.46
+    VERSION 0.${PNGLIB_RELEASE}.0
+    SOVERSION 0
+    CLEAN_DIRECT_OUTPUT 1)
+endif()
+if(PNG_STATIC)
+  if(NOT WIN32)
+    # that's uncool on win32 - it overwrites our static import lib...
+    set_target_properties(${PNG_LIB_NAME_STATIC} PROPERTIES
+      OUTPUT_NAME ${PNG_LIB_NAME}
+      CLEAN_DIRECT_OUTPUT 1)
+  endif()
+endif()
+
+# INSTALL
+if(NOT SKIP_INSTALL_LIBRARIES AND NOT SKIP_INSTALL_ALL )
+  if(PNG_SHARED)
+    install(TARGETS ${PNG_LIB_NAME}
+            RUNTIME DESTINATION bin
+            LIBRARY DESTINATION lib
+            ARCHIVE DESTINATION lib)
+  endif()
+  if(PNG_STATIC)
+    install(TARGETS ${PNG_LIB_NAME_STATIC}
+            LIBRARY DESTINATION lib
+            ARCHIVE DESTINATION lib)
+  endif()
+endif()
+
+if(NOT SKIP_INSTALL_HEADERS AND NOT SKIP_INSTALL_ALL )
+  install(FILES png.h pngconf.h         DESTINATION include)
+  install(FILES png.h pngconf.h         DESTINATION include/${PNGLIB_NAME})
+endif()
+if(NOT SKIP_INSTALL_EXECUTABLES AND NOT SKIP_INSTALL_ALL )
+  install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/libpng-config DESTINATION bin)
+  install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config
+          DESTINATION bin)
+endif()
+if(NOT SKIP_INSTALL_FILES AND NOT SKIP_INSTALL_ALL )
+  # Install man pages
+  install(FILES libpng.3 libpngpf.3             DESTINATION man/man3)
+  install(FILES png.5                           DESTINATION man/man5)
+  # Install pkg-config files
+  install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libpng.pc
+          DESTINATION lib/pkgconfig)
+  install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libpng-config
+          DESTINATION bin)
+  install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}.pc
+          DESTINATION lib/pkgconfig)
+  install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config
+          DESTINATION bin)
+endif()
+
+# what's with libpng.txt and all the extra files?
+
+
+# UNINSTALL
+# do we need this?
+
+
+# DIST
+# do we need this?
+
+# to create msvc import lib for mingw compiled shared lib
+# pexports libpng.dll > libpng.def
+# lib /def:libpng.def /machine:x86
+
diff --git a/src/libpng/INSTALL b/src/libpng/INSTALL
new file mode 100644
index 0000000..0a5f001
--- /dev/null
+++ b/src/libpng/INSTALL
@@ -0,0 +1,143 @@
+
+Installing libpng version 1.2.46 - July 9, 2011
+
+On Unix/Linux and similar systems, you can simply type
+
+    ./configure [--prefix=/path]
+    make check
+    make install
+
+and ignore the rest of this document.
+
+If configure does not work on your system and you have a reasonably
+up-to-date set of tools, running ./autogen.sh before running ./configure
+may fix the problem.  You can also run the individual commands in
+autogen.sh with the --force option, if supported by your version of
+the tools.  If you run 'libtoolize --force', though, this will replace
+the distributed, patched, version of ltmain.sh with an unpatched version
+and your shared library builds may fail to produce libraries with the
+correct version numbers.
+
+Instead, you can use one of the custom-built makefiles in the
+"scripts" directory
+
+    cp scripts/makefile.system makefile
+    make test
+    make install
+
+The files that are presently available in the scripts directory
+are listed and described in scripts/README.txt.
+
+Or you can use one of the "projects" in the "projects" directory.
+
+Before installing libpng, you must first install zlib, if it
+is not already on your system.  zlib can usually be found
+wherever you got libpng.  zlib can be placed in another directory,
+at the same level as libpng.
+
+If you want to use "cmake" (see www.cmake.org), type
+
+   cmake . -DCMAKE_INSTALL_PREFIX=/path
+   make
+   make install
+
+If your system already has a preinstalled zlib you will still need
+to have access to the zlib.h and zconf.h include files that
+correspond to the version of zlib that's installed.
+
+You can rename the directories that you downloaded (they
+might be called "libpng-1.2.46" or "libpng12" and "zlib-1.2.3"
+or "zlib123") so that you have directories called "zlib" and "libpng".
+
+Your directory structure should look like this:
+
+   ..       (the parent directory)
+      libpng  (this directory)
+          INSTALL (this file)
+          README
+          *.h
+          *.c
+          CMakeLists.txt    =>  "cmake" script
+          configuration files:
+             configure.ac, configure, Makefile.am, Makefile.in,
+             autogen.sh, config.guess, ltmain.sh, missing,
+             aclocal.m4, config.h.in, config.sub,
+             depcomp, install-sh, mkinstalldirs, test-pngtest.sh
+          contrib
+             gregbook
+             pngminim
+             pngminus
+             pngsuite
+             visupng
+          projects
+             cbuilder5 (Borland)
+             visualc6 (msvc)
+             visualc71
+             xcode
+          scripts
+             makefile.*
+             *.def (module definition files)
+          pngtest.png
+          etc.
+      zlib
+          README
+          *.h
+          *.c
+          contrib
+          etc.
+
+If the line endings in the files look funny, you may wish to get the other
+distribution of libpng.  It is available in both tar.gz (UNIX style line
+endings) and zip (DOS style line endings) formats.
+
+If you are building libpng with MSVC, you can enter the
+libpng projects\visualc6 or visualc71 directory and follow the instructions
+in README.txt.
+
+Otherwise enter the zlib directory and follow the instructions in zlib/README,
+then come back here and run "configure" or choose the appropriate
+makefile.sys in the scripts directory.
+
+Copy the file (or files) that you need from the
+scripts directory into this directory, for example
+
+   MSDOS example: copy scripts\makefile.msc makefile
+   UNIX example:    cp scripts/makefile.std makefile
+
+Read the makefile to see if you need to change any source or
+target directories to match your preferences.
+
+Then read pngconf.h to see if you want to make any configuration
+changes.
+
+Then just run "make" which will create the libpng library in
+this directory and "make test" which will run a quick test that reads
+the "pngtest.png" file and writes a "pngout.png" file that should be
+identical to it.  Look for "9782 zero samples" in the output of the
+test.  For more confidence, you can run another test by typing
+"pngtest pngnow.png" and looking for "289 zero samples" in the output.
+Also, you can run "pngtest -m contrib/pngsuite/*.png" and compare
+your output with the result shown in contrib/pngsuite/README.
+
+Most of the makefiles will allow you to run "make install" to
+put the library in its final resting place (if you want to
+do that, run "make install" in the zlib directory first if necessary).
+Some also allow you to run "make test-installed" after you have
+run "make install".
+
+If you encounter a compiler error message complaining about the
+lines
+
+      __png.h__ already includes setjmp.h;
+      __dont__ include it again.;
+
+this means you have compiled another module that includes setjmp.h,
+which is hazardous because the two modules might not include exactly
+the same setjmp.h.  If you are sure that you know what you are doing
+and that they are exactly the same, then you can comment out or
+delete the two lines.  Better yet, use the cexcept interface
+instead, as demonstrated in contrib/visupng of the libpng distribution.
+
+Further information can be found in the README and libpng.txt
+files, in the individual makefiles, in png.h, and the manual pages
+libpng.3 and png.5.
diff --git a/src/libpng/KNOWNBUG b/src/libpng/KNOWNBUG
new file mode 100644
index 0000000..28e83df
--- /dev/null
+++ b/src/libpng/KNOWNBUG
@@ -0,0 +1,22 @@
+
+Known bugs in libpng version 1.2.46
+
+1. February 23, 2006: The custom makefiles don't build libpng with -lz.
+
+   STATUS: This is a subject of debate. The change will probably be made
+   as a part of a major overhaul of the makefiles in libpng version 1.4.0.
+
+2. February 24, 2006: The Makefile generated by the "configure" script
+   fails to install symbolic links
+   libpng12.so => libpng12.so.0.1.2.9betaN
+   that are generated by the custom makefiles.
+
+3. September 4, 2007:  There is a report that pngtest crashes on MacOS 10.
+
+   STATUS: workarounds are
+      1) Compile without optimization (crashes are observed with
+         -arch i386 and -O2 or -O3, using gcc-4.0.1).
+      2) Compile pngtest.c with PNG_DEBUG defined (the bug goes away if
+         you try to look at it).
+      3) Ignore the crash.  The library itself seems to be OK.
+
diff --git a/src/libpng/LICENSE b/src/libpng/LICENSE
new file mode 100644
index 0000000..0fa9cb7
--- /dev/null
+++ b/src/libpng/LICENSE
@@ -0,0 +1,111 @@
+
+This copy of the libpng notices is provided for your convenience.  In case of
+any discrepancy between this copy and the notices in the file png.h that is
+included in the libpng distribution, the latter shall prevail.
+
+COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
+
+If you modify libpng you may insert additional notices immediately following
+this sentence.
+
+This code is released under the libpng license.
+
+libpng versions 1.2.6, August 15, 2004, through 1.2.46, July 9, 2011, are
+Copyright (c) 2004, 2006-2009 Glenn Randers-Pehrson, and are
+distributed according to the same disclaimer and license as libpng-1.2.5
+with the following individual added to the list of Contributing Authors
+
+   Cosmin Truta
+
+libpng versions 1.0.7, July 1, 2000, through 1.2.5 - October 3, 2002, are
+Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
+distributed according to the same disclaimer and license as libpng-1.0.6
+with the following individuals added to the list of Contributing Authors
+
+   Simon-Pierre Cadieux
+   Eric S. Raymond
+   Gilles Vollant
+
+and with the following additions to the disclaimer:
+
+   There is no warranty against interference with your enjoyment of the
+   library or against infringement.  There is no warranty that our
+   efforts or the library will fulfill any of your particular purposes
+   or needs.  This library is provided with all faults, and the entire
+   risk of satisfactory quality, performance, accuracy, and effort is with
+   the user.
+
+libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
+Copyright (c) 1998, 1999 Glenn Randers-Pehrson, and are
+distributed according to the same disclaimer and license as libpng-0.96,
+with the following individuals added to the list of Contributing Authors:
+
+   Tom Lane
+   Glenn Randers-Pehrson
+   Willem van Schaik
+
+libpng versions 0.89, June 1996, through 0.96, May 1997, are
+Copyright (c) 1996, 1997 Andreas Dilger
+Distributed according to the same disclaimer and license as libpng-0.88,
+with the following individuals added to the list of Contributing Authors:
+
+   John Bowler
+   Kevin Bracey
+   Sam Bushell
+   Magnus Holmgren
+   Greg Roelofs
+   Tom Tanner
+
+libpng versions 0.5, May 1995, through 0.88, January 1996, are
+Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
+
+For the purposes of this copyright and license, "Contributing Authors"
+is defined as the following set of individuals:
+
+   Andreas Dilger
+   Dave Martindale
+   Guy Eric Schalnat
+   Paul Schmidt
+   Tim Wegner
+
+The PNG Reference Library is supplied "AS IS".  The Contributing Authors
+and Group 42, Inc. disclaim all warranties, expressed or implied,
+including, without limitation, the warranties of merchantability and of
+fitness for any purpose.  The Contributing Authors and Group 42, Inc.
+assume no liability for direct, indirect, incidental, special, exemplary,
+or consequential damages, which may result from the use of the PNG
+Reference Library, even if advised of the possibility of such damage.
+
+Permission is hereby granted to use, copy, modify, and distribute this
+source code, or portions hereof, for any purpose, without fee, subject
+to the following restrictions:
+
+1. The origin of this source code must not be misrepresented.
+
+2. Altered versions must be plainly marked as such and must not
+   be misrepresented as being the original source.
+
+3. This Copyright notice may not be removed or altered from any
+   source or altered source distribution.
+
+The Contributing Authors and Group 42, Inc. specifically permit, without
+fee, and encourage the use of this source code as a component to
+supporting the PNG file format in commercial products.  If you use this
+source code in a product, acknowledgment is not required but would be
+appreciated.
+
+
+A "png_get_copyright" function is available, for convenient use in "about"
+boxes and the like:
+
+   printf("%s",png_get_copyright(NULL));
+
+Also, the PNG logo (in PNG format, of course) is supplied in the
+files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
+
+Libpng is OSI Certified Open Source Software.  OSI Certified Open Source is a
+certification mark of the Open Source Initiative.
+
+Glenn Randers-Pehrson
+glennrp at users.sourceforge.net
+July 9, 2011
diff --git a/src/libpng/README b/src/libpng/README
new file mode 100644
index 0000000..cbff544
--- /dev/null
+++ b/src/libpng/README
@@ -0,0 +1,275 @@
+README for libpng version 1.2.46 - July 9, 2011 (shared library 12.0)
+See the note about version numbers near the top of png.h
+
+See INSTALL for instructions on how to install libpng.
+
+Libpng comes in several distribution formats.  Get libpng-*.tar.gz,
+libpng-*.tar.xz, or libpng-*.tar.bz2 if you want UNIX-style line
+endings in the text files, or lpng*.7z or lpng*.zip if you want DOS-style
+line endings.  You can get UNIX-style line endings from the *.zip file
+by using "unzip -a" but there seems to be no simple way to recover
+UNIX-style line endings from the *.7z file.  The *.tar.xz file is
+recommended for *NIX users instead.
+
+Version 0.89 was the first official release of libpng.  Don't let the
+fact that it's the first release fool you.  The libpng library has been in
+extensive use and testing since mid-1995.  By late 1997 it had
+finally gotten to the stage where there hadn't been significant
+changes to the API in some time, and people have a bad feeling about
+libraries with versions < 1.0.  Version 1.0.0 was released in
+March 1998.
+
+****
+Note that some of the changes to the png_info structure render this
+version of the library binary incompatible with libpng-0.89 or
+earlier versions if you are using a shared library.  The type of the
+"filler" parameter for png_set_filler() has changed from png_byte to
+png_uint_32, which will affect shared-library applications that use
+this function.
+
+To avoid problems with changes to the internals of png_info_struct,
+new APIs have been made available in 0.95 to avoid direct application
+access to info_ptr.  These functions are the png_set_<chunk> and
+png_get_<chunk> functions.  These functions should be used when
+accessing/storing the info_struct data, rather than manipulating it
+directly, to avoid such problems in the future.
+
+It is important to note that the APIs do not make current programs
+that access the info struct directly incompatible with the new
+library.  However, it is strongly suggested that new programs use
+the new APIs (as shown in example.c and pngtest.c), and older programs
+be converted to the new format, to facilitate upgrades in the future.
+****
+
+Additions since 0.90 include the ability to compile libpng as a
+Windows DLL, and new APIs for accessing data in the info struct.
+Experimental functions include the ability to set weighting and cost
+factors for row filter selection, direct reads of integers from buffers
+on big-endian processors that support misaligned data access, faster
+methods of doing alpha composition, and more accurate 16->8 bit color
+conversion.
+
+The additions since 0.89 include the ability to read from a PNG stream
+which has had some (or all) of the signature bytes read by the calling
+application.  This also allows the reading of embedded PNG streams that
+do not have the PNG file signature.  As well, it is now possible to set
+the library action on the detection of chunk CRC errors.  It is possible
+to set different actions based on whether the CRC error occurred in a
+critical or an ancillary chunk.
+
+The changes made to the library, and bugs fixed are based on discussions
+on the png-mng-implement mailing list and not on material submitted
+privately to Guy, Andreas, or Glenn.  They will forward any good
+suggestions to the list.
+
+For a detailed description on using libpng, read libpng.txt.  For
+examples of libpng in a program, see example.c and pngtest.c.  For usage
+information and restrictions (what little they are) on libpng, see
+png.h.  For a description on using zlib (the compression library used by
+libpng) and zlib's restrictions, see zlib.h
+
+I have included a general makefile, as well as several machine and
+compiler specific ones, but you may have to modify one for your own needs.
+
+You should use zlib 1.0.4 or later to run this, but it MAY work with
+versions as old as zlib 0.95.  Even so, there are bugs in older zlib
+versions which can cause the output of invalid compression streams for
+some images.  You will definitely need zlib 1.0.4 or later if you are
+taking advantage of the MS-DOS "far" structure allocation for the small
+and medium memory models.  You should also note that zlib is a
+compression library that is useful for more things than just PNG files.
+You can use zlib as a drop-in replacement for fread() and fwrite() if
+you are so inclined.
+
+zlib should be available at the same place that libpng is, or at
+ftp://ftp.simplesystems.org/pub/png/src/
+
+You may also want a copy of the PNG specification.  It is available
+as an RFC, a W3C Recommendation, and an ISO/IEC Standard.  You can find
+these at http://www.libpng.org/pub/png/pngdocs.html
+
+This code is currently being archived at libpng.sf.net in the
+[DOWNLOAD] area, and on CompuServe, Lib 20 (PNG SUPPORT)
+at GO GRAPHSUP.  If you can't find it in any of those places,
+e-mail me, and I'll help you find it.
+
+If you have any code changes, requests, problems, etc., please e-mail
+them to me.  Also, I'd appreciate any make files or project files,
+and any modifications you needed to make to get libpng to compile,
+along with a #define variable to tell what compiler/system you are on.
+If you needed to add transformations to libpng, or wish libpng would
+provide the image in a different way, drop me a note (and code, if
+possible), so I can consider supporting the transformation.
+Finally, if you get any warning messages when compiling libpng
+(note: not zlib), and they are easy to fix, I'd appreciate the
+fix.  Please mention "libpng" somewhere in the subject line.  Thanks.
+
+This release was created and will be supported by myself (of course
+based in a large way on Guy's and Andreas' earlier work), and the PNG
+development group.
+
+Send comments/corrections/commendations to png-mng-implement at lists.sf.net
+(subscription required; visit 
+https://lists.sourceforge.net/lists/listinfo/png-mng-implement
+to subscribe) or to glennrp at users.sourceforge.net
+
+You can't reach Guy, the original libpng author, at the addresses
+given in previous versions of this document.  He and Andreas will
+read mail addressed to the png-mng-implement list, however.
+
+Please do not send general questions about PNG.  Send them to
+the (png-mng-misc at lists.sourceforge.net, subscription required, visit
+https://lists.sourceforge.net/lists/listinfo/png-mng-misc to
+subscribe). On the other hand, please do not send libpng questions to
+that address, send them to me or to the png-mng-implement list.  I'll
+get them in the end anyway.  If you have a question about something
+in the PNG specification that is related to using libpng, send it
+to me.  Send me any questions that start with "I was using libpng,
+and ...".  If in doubt, send questions to me.  I'll bounce them
+to others, if necessary.
+
+Please do not send suggestions on how to change PNG.  We have
+been discussing PNG for twelve years now, and it is official and
+finished.  If you have suggestions for libpng, however, I'll
+gladly listen.  Even if your suggestion is not used immediately,
+it may be used later.
+
+Files in this distribution:
+
+      ANNOUNCE      =>  Announcement of this version, with recent changes
+      CHANGES       =>  Description of changes between libpng versions
+      KNOWNBUG      =>  List of known bugs and deficiencies
+      LICENSE       =>  License to use and redistribute libpng
+      README        =>  This file
+      TODO          =>  Things not implemented in the current library
+      Y2KINFO       =>  Statement of Y2K compliance
+      example.c     =>  Example code for using libpng functions
+      libpng-*-*-diff.txt => Diff from previous release
+      libpng.3      =>  manual page for libpng (includes libpng.txt)
+      libpng.txt    =>  Description of libpng and its functions
+      libpngpf.3    =>  manual page for libpng's private functions
+      png.5         =>  manual page for the PNG format
+      png.c         =>  Basic interface functions common to library
+      png.h         =>  Library function and interface declarations
+      pngconf.h     =>  System specific library configuration
+      pngerror.c    =>  Error/warning message I/O functions
+      pngget.c      =>  Functions for retrieving info from struct
+      pngmem.c      =>  Memory handling functions
+      pngbar.png    =>  PNG logo, 88x31
+      pngnow.png    =>  PNG logo, 98x31
+      pngpread.c    =>  Progressive reading functions
+      pngread.c     =>  Read data/helper high-level functions
+      pngrio.c      =>  Lowest-level data read I/O functions
+      pngrtran.c    =>  Read data transformation functions
+      pngrutil.c    =>  Read data utility functions
+      pngset.c      =>  Functions for storing data into the info_struct
+      pngtest.c     =>  Library test program
+      pngtest.png   =>  Library test sample image
+      pngtrans.c    =>  Common data transformation functions
+      pngwio.c      =>  Lowest-level write I/O functions
+      pngwrite.c    =>  High-level write functions
+      pngwtran.c    =>  Write data transformations
+      pngwutil.c    =>  Write utility functions
+      contrib       =>  Contributions
+       gregbook         =>  source code for PNG reading and writing, from
+                            Greg Roelofs' "PNG: The Definitive Guide",
+                            O'Reilly, 1999
+       msvctest     =>  Builds and runs pngtest using a MSVC workspace
+       pngminim     =>  Simple pnm2pngm and png2pnmm programs
+       pngminus     =>  Simple pnm2png and png2pnm programs
+       pngsuite     =>  Test images
+       visupng      =>  Contains a MSVC workspace for VisualPng
+      projects      =>  Contains project files and workspaces for
+                        building a DLL
+       beos             =>  Contains a Beos workspace for building libpng
+       c5builder        =>  Contains a Borland workspace for building
+                            libpng and zlib
+       netware.txt      =>  Contains instructions for downloading a set
+                            of project files for building libpng and
+                            zlib on Netware.
+       visualc6         =>  Contains a Microsoft Visual C++ (MSVC)
+                            workspace for building libpng and zlib
+       wince.txt        =>  Contains instructions for downloading a
+                            Microsoft Visual C++ (Windows CD Toolkit)
+                            workspace for building libpng and zlib on
+                            WindowsCE
+       xcode            =>  Contains xcode project files
+      scripts       =>  Directory containing scripts for building libpng:
+       descrip.mms      =>  VMS makefile for MMS or MMK
+       makefile.std     =>  Generic UNIX makefile (cc, creates static
+                            libpng.a)
+       makefile.elf     =>  Linux/ELF gcc makefile symbol versioning,
+                            creates libpng12.so.0.1.2.46)
+       makefile.linux   =>  Linux/ELF makefile (gcc, creates
+                            libpng12.so.0.1.2.46)
+       makefile.gcmmx   =>  Linux/ELF makefile (gcc, creates
+                            libpng12.so.0.1.2.46, previously
+                            used assembler code tuned for Intel MMX
+                            platform)
+       makefile.gcc     =>  Generic makefile (gcc, creates static
+                            libpng.a)
+       makefile.knr     =>  Archaic UNIX Makefile that converts files
+                            with ansi2knr (Requires ansi2knr.c from
+                            ftp://ftp.cs.wisc.edu/ghost)
+       makefile.aix     =>  AIX makefile
+       makefile.cygwin  =>  Cygwin/gcc makefile
+       makefile.darwin  =>  Darwin makefile
+       makefile.dec     =>  DEC Alpha UNIX makefile
+       makefile.freebsd =>  FreeBSD makefile
+       makefile.hpgcc   =>  HPUX makefile using gcc
+       makefile.hpux    =>  HPUX (10.20 and 11.00) makefile
+       makefile.hp64    =>  HPUX (10.20 and 11.00) makefile, 64 bit
+       makefile.ibmc    =>  IBM C/C++ version 3.x for Win32 and OS/2
+                            (static)
+       makefile.intel   =>  Intel C/C++ version 4.0 and later
+       libpng.icc       =>  Project file, IBM VisualAge/C++ 4.0 or later
+       makefile.netbsd  =>  NetBSD/cc makefile, makes libpng.so.
+       makefile.ne12bsd  =>  NetBSD/cc makefile, makes libpng12.so
+       makefile.openbsd =>  OpenBSD makefile
+       makefile.sgi     =>  Silicon Graphics IRIX (cc, creates static lib)
+       makefile.sggcc   =>  Silicon Graphics
+                            (gcc, creates libpng12.so.0.1.2.46)
+       makefile.sunos   =>  Sun makefile
+       makefile.solaris =>  Solaris 2.X makefile
+                            (gcc, creates libpng12.so.0.1.2.46)
+       makefile.so9     =>  Solaris 9 makefile
+                            (gcc, creates libpng12.so.0.1.2.46)
+       makefile.32sunu  =>  Sun Ultra 32-bit makefile
+       makefile.64sunu  =>  Sun Ultra 64-bit makefile
+       makefile.sco     =>  For SCO OSr5  ELF and Unixware 7 with Native cc
+       makefile.mips    =>  MIPS makefile
+       makefile.acorn   =>  Acorn makefile
+       makefile.amiga   =>  Amiga makefile
+       smakefile.ppc    =>  AMIGA smakefile for SAS C V6.58/7.00 PPC
+                            compiler (Requires SCOPTIONS, copied from
+                            scripts/SCOPTIONS.ppc)
+       makefile.atari   =>  Atari makefile
+       makefile.beos    =>  BEOS makefile for X86
+       makefile.bor     =>  Borland makefile (uses bcc)
+       makefile.bc32    =>  32-bit Borland C++ (all modules compiled in C mode)
+       makefile.tc3     =>  Turbo C 3.0 makefile
+       makefile.dj2     =>  DJGPP 2 makefile
+       makefile.msc     =>  Microsoft C makefile
+       makefile.vcawin32=>  makefile for Microsoft Visual C++ 5.0 and
+                            later (previously used assembler code tuned
+                            for Intel MMX platform)
+       makefile.vcwin32 =>  makefile for Microsoft Visual C++ 4.0 and
+                            later (does not use assembler code)
+       makefile.os2     =>  OS/2 Makefile (gcc and emx, requires pngos2.def)
+       pngos2.def       =>  OS/2 module definition file used by makefile.os2
+       makefile.watcom  =>  Watcom 10a+ Makefile, 32-bit flat memory model
+       makevms.com      =>  VMS build script
+       SCOPTIONS.ppc    =>  Used with smakefile.ppc
+
+Good luck, and happy coding.
+
+-Glenn Randers-Pehrson (current maintainer, since 1998)
+ Internet: glennrp at users.sourceforge.net
+
+-Andreas Eric Dilger (former maintainer, 1996-1997)
+ Internet: adilger at enel.ucalgary.ca
+ Web: http://members.shaw.ca/adilger/
+
+-Guy Eric Schalnat (original author and former maintainer, 1995-1996)
+ (formerly of Group 42, Inc)
+ Internet: gschal at infinet.com
diff --git a/src/libpng/TODO b/src/libpng/TODO
new file mode 100644
index 0000000..face765
--- /dev/null
+++ b/src/libpng/TODO
@@ -0,0 +1,25 @@
+TODO - list of things to do for libpng:
+
+Final bug fixes.
+Improve API by hiding the png_struct and png_info structs.
+Finish work on the no-floating-point version (including gamma compensation)
+Better C++ wrapper/full C++ implementation?
+Fix problem with C++ and EXTERN "C".
+cHRM transformation.
+Improve setjmp/longjmp usage or remove it in favor of returning error codes.
+Add "grayscale->palette" transformation and "palette->grayscale" detection.
+Improved dithering.
+Multi-lingual error and warning message support.
+Complete sRGB transformation (presently it simply uses gamma=0.45455).
+Man pages for function calls.
+Better documentation.
+Better filter selection
+   (counting huffman bits/precompression?  filter inertia?  filter costs?).
+Histogram creation.
+Text conversion between different code pages (Latin-1 -> Mac and DOS).
+Should we always malloc 2^bit_depth PLTE/tRNS/hIST entries for safety?
+Build gamma tables using fixed point (and do away with floating point entirely).
+Use greater precision when changing to linear gamma for compositing against
+  background and doing rgb-to-gray transformation.
+Investigate pre-incremented loop counters and other loop constructions.
+Add interpolated method of handling interlacing.
diff --git a/src/libpng/Y2KINFO b/src/libpng/Y2KINFO
new file mode 100644
index 0000000..0e2a920
--- /dev/null
+++ b/src/libpng/Y2KINFO
@@ -0,0 +1,55 @@
+   Y2K compliance in libpng:
+   =========================
+
+      July 9, 2011
+
+      Since the PNG Development group is an ad-hoc body, we can't make
+      an official declaration.
+
+      This is your unofficial assurance that libpng from version 0.71 and
+      upward through 1.2.46 are Y2K compliant.  It is my belief that earlier
+      versions were also Y2K compliant.
+
+      Libpng only has three year fields.  One is a 2-byte unsigned integer
+      that will hold years up to 65535.  The other two hold the date in text
+      format, and will hold years up to 9999.
+
+      The integer is
+          "png_uint_16 year" in png_time_struct.
+
+      The strings are
+          "png_charp time_buffer" in png_struct and
+          "near_time_buffer", which is a local character string in png.c.
+
+      There are seven time-related functions:
+
+          png_convert_to_rfc_1123() in png.c
+            (formerly png_convert_to_rfc_1152() in error)
+          png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
+          png_convert_from_time_t() in pngwrite.c
+          png_get_tIME() in pngget.c
+          png_handle_tIME() in pngrutil.c, called in pngread.c
+          png_set_tIME() in pngset.c
+          png_write_tIME() in pngwutil.c, called in pngwrite.c
+
+      All appear to handle dates properly in a Y2K environment.  The
+      png_convert_from_time_t() function calls gmtime() to convert from system
+      clock time, which returns (year - 1900), which we properly convert to
+      the full 4-digit year.  There is a possibility that applications using
+      libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
+      function, or that they are incorrectly passing only a 2-digit year
+      instead of "year - 1900" into the png_convert_from_struct_tm() function,
+      but this is not under our control.  The libpng documentation has always
+      stated that it works with 4-digit years, and the APIs have been
+      documented as such.
+
+      The tIME chunk itself is also Y2K compliant.  It uses a 2-byte unsigned
+      integer to hold the year, and can hold years as large as 65535.
+
+      zlib, upon which libpng depends, is also Y2K compliant.  It contains
+      no date-related code.
+
+
+         Glenn Randers-Pehrson
+         libpng maintainer
+         PNG Development Group
diff --git a/src/libpng/png.c b/src/libpng/png.c
new file mode 100644
index 0000000..95ea40a
--- /dev/null
+++ b/src/libpng/png.c
@@ -0,0 +1,1100 @@
+
+/* png.c - location for general purpose libpng functions
+ *
+ * Last changed in libpng 1.2.46 [February 25, 2011]
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ */
+
+#define PNG_INTERNAL
+#define PNG_NO_EXTERN
+#define PNG_NO_PEDANTIC_WARNINGS
+#include "png.h"
+
+/* Generate a compiler error if there is an old png.h in the search path. */
+typedef version_1_2_46 Your_png_h_is_not_version_1_2_46;
+
+/* Version information for C files.  This had better match the version
+ * string defined in png.h.
+ */
+
+#ifdef PNG_USE_GLOBAL_ARRAYS
+/* png_libpng_ver was changed to a function in version 1.0.5c */
+PNG_CONST char png_libpng_ver[18] = PNG_LIBPNG_VER_STRING;
+
+#ifdef PNG_READ_SUPPORTED
+
+/* png_sig was changed to a function in version 1.0.5c */
+/* Place to hold the signature string for a PNG file. */
+PNG_CONST png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
+#endif /* PNG_READ_SUPPORTED */
+
+/* Invoke global declarations for constant strings for known chunk types */
+PNG_IHDR;
+PNG_IDAT;
+PNG_IEND;
+PNG_PLTE;
+PNG_bKGD;
+PNG_cHRM;
+PNG_gAMA;
+PNG_hIST;
+PNG_iCCP;
+PNG_iTXt;
+PNG_oFFs;
+PNG_pCAL;
+PNG_sCAL;
+PNG_pHYs;
+PNG_sBIT;
+PNG_sPLT;
+PNG_sRGB;
+PNG_tEXt;
+PNG_tIME;
+PNG_tRNS;
+PNG_zTXt;
+
+#ifdef PNG_READ_SUPPORTED
+/* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+
+/* Start of interlace block */
+PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
+
+/* Offset to next interlace block */
+PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
+
+/* Start of interlace block in the y direction */
+PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
+
+/* Offset to next interlace block in the y direction */
+PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
+
+/* Height of interlace block.  This is not currently used - if you need
+ * it, uncomment it here and in png.h
+PNG_CONST int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
+*/
+
+/* Mask to determine which pixels are valid in a pass */
+PNG_CONST int FARDATA png_pass_mask[] =
+    {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
+
+/* Mask to determine which pixels to overwrite while displaying */
+PNG_CONST int FARDATA png_pass_dsp_mask[]
+   = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
+
+#endif /* PNG_READ_SUPPORTED */
+#endif /* PNG_USE_GLOBAL_ARRAYS */
+
+/* Tells libpng that we have already handled the first "num_bytes" bytes
+ * of the PNG file signature.  If the PNG data is embedded into another
+ * stream we can set num_bytes = 8 so that libpng will not attempt to read
+ * or write any of the magic bytes before it starts on the IHDR.
+ */
+
+#ifdef PNG_READ_SUPPORTED
+void PNGAPI
+png_set_sig_bytes(png_structp png_ptr, int num_bytes)
+{
+   png_debug(1, "in png_set_sig_bytes");
+
+   if (png_ptr == NULL)
+      return;
+
+   if (num_bytes > 8)
+      png_error(png_ptr, "Too many bytes for PNG signature.");
+
+   png_ptr->sig_bytes = (png_byte)(num_bytes < 0 ? 0 : num_bytes);
+}
+
+/* Checks whether the supplied bytes match the PNG signature.  We allow
+ * checking less than the full 8-byte signature so that those apps that
+ * already read the first few bytes of a file to determine the file type
+ * can simply check the remaining bytes for extra assurance.  Returns
+ * an integer less than, equal to, or greater than zero if sig is found,
+ * respectively, to be less than, to match, or be greater than the correct
+ * PNG signature (this is the same behaviour as strcmp, memcmp, etc).
+ */
+int PNGAPI
+png_sig_cmp(png_bytep sig, png_size_t start, png_size_t num_to_check)
+{
+   png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10};
+   if (num_to_check > 8)
+      num_to_check = 8;
+   else if (num_to_check < 1)
+      return (-1);
+
+   if (start > 7)
+      return (-1);
+
+   if (start + num_to_check > 8)
+      num_to_check = 8 - start;
+
+   return ((int)(png_memcmp(&sig[start], &png_signature[start], num_to_check)));
+}
+
+#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
+/* (Obsolete) function to check signature bytes.  It does not allow one
+ * to check a partial signature.  This function might be removed in the
+ * future - use png_sig_cmp().  Returns true (nonzero) if the file is PNG.
+ */
+int PNGAPI
+png_check_sig(png_bytep sig, int num)
+{
+  return ((int)!png_sig_cmp(sig, (png_size_t)0, (png_size_t)num));
+}
+#endif
+#endif /* PNG_READ_SUPPORTED */
+
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
+/* Function to allocate memory for zlib and clear it to 0. */
+#ifdef PNG_1_0_X
+voidpf PNGAPI
+#else
+voidpf /* PRIVATE */
+#endif
+png_zalloc(voidpf png_ptr, uInt items, uInt size)
+{
+   png_voidp ptr;
+   png_structp p=(png_structp)png_ptr;
+   png_uint_32 save_flags=p->flags;
+   png_uint_32 num_bytes;
+
+   if (png_ptr == NULL)
+      return (NULL);
+   if (items > PNG_UINT_32_MAX/size)
+   {
+     png_warning (p, "Potential overflow in png_zalloc()");
+     return (NULL);
+   }
+   num_bytes = (png_uint_32)items * size;
+
+   p->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;
+   ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes);
+   p->flags=save_flags;
+
+#if defined(PNG_1_0_X) && !defined(PNG_NO_ZALLOC_ZERO)
+   if (ptr == NULL)
+       return ((voidpf)ptr);
+
+   if (num_bytes > (png_uint_32)0x8000L)
+   {
+      png_memset(ptr, 0, (png_size_t)0x8000L);
+      png_memset((png_bytep)ptr + (png_size_t)0x8000L, 0,
+         (png_size_t)(num_bytes - (png_uint_32)0x8000L));
+   }
+   else
+   {
+      png_memset(ptr, 0, (png_size_t)num_bytes);
+   }
+#endif
+   return ((voidpf)ptr);
+}
+
+/* Function to free memory for zlib */
+#ifdef PNG_1_0_X
+void PNGAPI
+#else
+void /* PRIVATE */
+#endif
+png_zfree(voidpf png_ptr, voidpf ptr)
+{
+   png_free((png_structp)png_ptr, (png_voidp)ptr);
+}
+
+/* Reset the CRC variable to 32 bits of 1's.  Care must be taken
+ * in case CRC is > 32 bits to leave the top bits 0.
+ */
+void /* PRIVATE */
+png_reset_crc(png_structp png_ptr)
+{
+   png_ptr->crc = crc32(0, Z_NULL, 0);
+}
+
+/* Calculate the CRC over a section of data.  We can only pass as
+ * much data to this routine as the largest single buffer size.  We
+ * also check that this data will actually be used before going to the
+ * trouble of calculating it.
+ */
+void /* PRIVATE */
+png_calculate_crc(png_structp png_ptr, png_bytep ptr, png_size_t length)
+{
+   int need_crc = 1;
+
+   if (png_ptr->chunk_name[0] & 0x20)                     /* ancillary */
+   {
+      if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) ==
+          (PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN))
+         need_crc = 0;
+   }
+   else                                                    /* critical */
+   {
+      if (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE)
+         need_crc = 0;
+   }
+
+   if (need_crc)
+      png_ptr->crc = crc32(png_ptr->crc, ptr, (uInt)length);
+}
+
+/* Allocate the memory for an info_struct for the application.  We don't
+ * really need the png_ptr, but it could potentially be useful in the
+ * future.  This should be used in favour of malloc(png_sizeof(png_info))
+ * and png_info_init() so that applications that want to use a shared
+ * libpng don't have to be recompiled if png_info changes size.
+ */
+png_infop PNGAPI
+png_create_info_struct(png_structp png_ptr)
+{
+   png_infop info_ptr;
+
+   png_debug(1, "in png_create_info_struct");
+
+   if (png_ptr == NULL)
+      return (NULL);
+
+#ifdef PNG_USER_MEM_SUPPORTED
+   info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO,
+      png_ptr->malloc_fn, png_ptr->mem_ptr);
+#else
+   info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
+#endif
+   if (info_ptr != NULL)
+      png_info_init_3(&info_ptr, png_sizeof(png_info));
+
+   return (info_ptr);
+}
+
+/* This function frees the memory associated with a single info struct.
+ * Normally, one would use either png_destroy_read_struct() or
+ * png_destroy_write_struct() to free an info struct, but this may be
+ * useful for some applications.
+ */
+void PNGAPI
+png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr)
+{
+   png_infop info_ptr = NULL;
+
+   png_debug(1, "in png_destroy_info_struct");
+
+   if (png_ptr == NULL)
+      return;
+
+   if (info_ptr_ptr != NULL)
+      info_ptr = *info_ptr_ptr;
+
+   if (info_ptr != NULL)
+   {
+      png_info_destroy(png_ptr, info_ptr);
+
+#ifdef PNG_USER_MEM_SUPPORTED
+      png_destroy_struct_2((png_voidp)info_ptr, png_ptr->free_fn,
+          png_ptr->mem_ptr);
+#else
+      png_destroy_struct((png_voidp)info_ptr);
+#endif
+      *info_ptr_ptr = NULL;
+   }
+}
+
+/* Initialize the info structure.  This is now an internal function (0.89)
+ * and applications using it are urged to use png_create_info_struct()
+ * instead.
+ */
+#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
+#undef png_info_init
+void PNGAPI
+png_info_init(png_infop info_ptr)
+{
+   /* We only come here via pre-1.0.12-compiled applications */
+   png_info_init_3(&info_ptr, 0);
+}
+#endif
+
+void PNGAPI
+png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size)
+{
+   png_infop info_ptr = *ptr_ptr;
+
+   png_debug(1, "in png_info_init_3");
+
+   if (info_ptr == NULL)
+      return;
+
+   if (png_sizeof(png_info) > png_info_struct_size)
+   {
+      png_destroy_struct(info_ptr);
+      info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
+      *ptr_ptr = info_ptr;
+   }
+
+   /* Set everything to 0 */
+   png_memset(info_ptr, 0, png_sizeof(png_info));
+}
+
+#ifdef PNG_FREE_ME_SUPPORTED
+void PNGAPI
+png_data_freer(png_structp png_ptr, png_infop info_ptr,
+   int freer, png_uint_32 mask)
+{
+   png_debug(1, "in png_data_freer");
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   if (freer == PNG_DESTROY_WILL_FREE_DATA)
+      info_ptr->free_me |= mask;
+   else if (freer == PNG_USER_WILL_FREE_DATA)
+      info_ptr->free_me &= ~mask;
+   else
+      png_warning(png_ptr,
+         "Unknown freer parameter in png_data_freer.");
+}
+#endif
+
+void PNGAPI
+png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask,
+   int num)
+{
+   png_debug(1, "in png_free_data");
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+#ifdef PNG_TEXT_SUPPORTED
+   /* Free text item num or (if num == -1) all text items */
+#ifdef PNG_FREE_ME_SUPPORTED
+   if ((mask & PNG_FREE_TEXT) & info_ptr->free_me)
+#else
+   if (mask & PNG_FREE_TEXT)
+#endif
+   {
+      if (num != -1)
+      {
+         if (info_ptr->text && info_ptr->text[num].key)
+         {
+            png_free(png_ptr, info_ptr->text[num].key);
+            info_ptr->text[num].key = NULL;
+         }
+      }
+      else
+      {
+         int i;
+         for (i = 0; i < info_ptr->num_text; i++)
+             png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, i);
+         png_free(png_ptr, info_ptr->text);
+         info_ptr->text = NULL;
+         info_ptr->num_text=0;
+      }
+   }
+#endif
+
+#ifdef PNG_tRNS_SUPPORTED
+   /* Free any tRNS entry */
+#ifdef PNG_FREE_ME_SUPPORTED
+   if ((mask & PNG_FREE_TRNS) & info_ptr->free_me)
+#else
+   if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS))
+#endif
+   {
+      png_free(png_ptr, info_ptr->trans);
+      info_ptr->trans = NULL;
+      info_ptr->valid &= ~PNG_INFO_tRNS;
+#ifndef PNG_FREE_ME_SUPPORTED
+      png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
+#endif
+   }
+#endif
+
+#ifdef PNG_sCAL_SUPPORTED
+   /* Free any sCAL entry */
+#ifdef PNG_FREE_ME_SUPPORTED
+   if ((mask & PNG_FREE_SCAL) & info_ptr->free_me)
+#else
+   if (mask & PNG_FREE_SCAL)
+#endif
+   {
+#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
+      png_free(png_ptr, info_ptr->scal_s_width);
+      png_free(png_ptr, info_ptr->scal_s_height);
+      info_ptr->scal_s_width = NULL;
+      info_ptr->scal_s_height = NULL;
+#endif
+      info_ptr->valid &= ~PNG_INFO_sCAL;
+   }
+#endif
+
+#ifdef PNG_pCAL_SUPPORTED
+   /* Free any pCAL entry */
+#ifdef PNG_FREE_ME_SUPPORTED
+   if ((mask & PNG_FREE_PCAL) & info_ptr->free_me)
+#else
+   if (mask & PNG_FREE_PCAL)
+#endif
+   {
+      png_free(png_ptr, info_ptr->pcal_purpose);
+      png_free(png_ptr, info_ptr->pcal_units);
+      info_ptr->pcal_purpose = NULL;
+      info_ptr->pcal_units = NULL;
+      if (info_ptr->pcal_params != NULL)
+         {
+            int i;
+            for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
+            {
+               png_free(png_ptr, info_ptr->pcal_params[i]);
+               info_ptr->pcal_params[i] = NULL;
+            }
+            png_free(png_ptr, info_ptr->pcal_params);
+            info_ptr->pcal_params = NULL;
+         }
+      info_ptr->valid &= ~PNG_INFO_pCAL;
+   }
+#endif
+
+#ifdef PNG_iCCP_SUPPORTED
+   /* Free any iCCP entry */
+#ifdef PNG_FREE_ME_SUPPORTED
+   if ((mask & PNG_FREE_ICCP) & info_ptr->free_me)
+#else
+   if (mask & PNG_FREE_ICCP)
+#endif
+   {
+      png_free(png_ptr, info_ptr->iccp_name);
+      png_free(png_ptr, info_ptr->iccp_profile);
+      info_ptr->iccp_name = NULL;
+      info_ptr->iccp_profile = NULL;
+      info_ptr->valid &= ~PNG_INFO_iCCP;
+   }
+#endif
+
+#ifdef PNG_sPLT_SUPPORTED
+   /* Free a given sPLT entry, or (if num == -1) all sPLT entries */
+#ifdef PNG_FREE_ME_SUPPORTED
+   if ((mask & PNG_FREE_SPLT) & info_ptr->free_me)
+#else
+   if (mask & PNG_FREE_SPLT)
+#endif
+   {
+      if (num != -1)
+      {
+         if (info_ptr->splt_palettes)
+         {
+            png_free(png_ptr, info_ptr->splt_palettes[num].name);
+            png_free(png_ptr, info_ptr->splt_palettes[num].entries);
+            info_ptr->splt_palettes[num].name = NULL;
+            info_ptr->splt_palettes[num].entries = NULL;
+         }
+      }
+      else
+      {
+         if (info_ptr->splt_palettes_num)
+         {
+            int i;
+            for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
+               png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i);
+
+            png_free(png_ptr, info_ptr->splt_palettes);
+            info_ptr->splt_palettes = NULL;
+            info_ptr->splt_palettes_num = 0;
+         }
+         info_ptr->valid &= ~PNG_INFO_sPLT;
+      }
+   }
+#endif
+
+#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
+   if (png_ptr->unknown_chunk.data)
+   {
+      png_free(png_ptr, png_ptr->unknown_chunk.data);
+      png_ptr->unknown_chunk.data = NULL;
+   }
+
+#ifdef PNG_FREE_ME_SUPPORTED
+   if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
+#else
+   if (mask & PNG_FREE_UNKN)
+#endif
+   {
+      if (num != -1)
+      {
+          if (info_ptr->unknown_chunks)
+          {
+             png_free(png_ptr, info_ptr->unknown_chunks[num].data);
+             info_ptr->unknown_chunks[num].data = NULL;
+          }
+      }
+      else
+      {
+         int i;
+
+         if (info_ptr->unknown_chunks_num)
+         {
+            for (i = 0; i < (int)info_ptr->unknown_chunks_num; i++)
+               png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i);
+
+            png_free(png_ptr, info_ptr->unknown_chunks);
+            info_ptr->unknown_chunks = NULL;
+            info_ptr->unknown_chunks_num = 0;
+         }
+      }
+   }
+#endif
+
+#ifdef PNG_hIST_SUPPORTED
+   /* Free any hIST entry */
+#ifdef PNG_FREE_ME_SUPPORTED
+   if ((mask & PNG_FREE_HIST)  & info_ptr->free_me)
+#else
+   if ((mask & PNG_FREE_HIST) && (png_ptr->flags & PNG_FLAG_FREE_HIST))
+#endif
+   {
+      png_free(png_ptr, info_ptr->hist);
+      info_ptr->hist = NULL;
+      info_ptr->valid &= ~PNG_INFO_hIST;
+#ifndef PNG_FREE_ME_SUPPORTED
+      png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
+#endif
+   }
+#endif
+
+   /* Free any PLTE entry that was internally allocated */
+#ifdef PNG_FREE_ME_SUPPORTED
+   if ((mask & PNG_FREE_PLTE) & info_ptr->free_me)
+#else
+   if ((mask & PNG_FREE_PLTE) && (png_ptr->flags & PNG_FLAG_FREE_PLTE))
+#endif
+   {
+      png_zfree(png_ptr, info_ptr->palette);
+      info_ptr->palette = NULL;
+      info_ptr->valid &= ~PNG_INFO_PLTE;
+#ifndef PNG_FREE_ME_SUPPORTED
+      png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
+#endif
+      info_ptr->num_palette = 0;
+   }
+
+#ifdef PNG_INFO_IMAGE_SUPPORTED
+   /* Free any image bits attached to the info structure */
+#ifdef PNG_FREE_ME_SUPPORTED
+   if ((mask & PNG_FREE_ROWS) & info_ptr->free_me)
+#else
+   if (mask & PNG_FREE_ROWS)
+#endif
+   {
+      if (info_ptr->row_pointers)
+      {
+         int row;
+         for (row = 0; row < (int)info_ptr->height; row++)
+         {
+            png_free(png_ptr, info_ptr->row_pointers[row]);
+            info_ptr->row_pointers[row] = NULL;
+         }
+         png_free(png_ptr, info_ptr->row_pointers);
+         info_ptr->row_pointers = NULL;
+      }
+      info_ptr->valid &= ~PNG_INFO_IDAT;
+   }
+#endif
+
+#ifdef PNG_FREE_ME_SUPPORTED
+   if (num == -1)
+      info_ptr->free_me &= ~mask;
+   else
+      info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL);
+#endif
+}
+
+/* This is an internal routine to free any memory that the info struct is
+ * pointing to before re-using it or freeing the struct itself.  Recall
+ * that png_free() checks for NULL pointers for us.
+ */
+void /* PRIVATE */
+png_info_destroy(png_structp png_ptr, png_infop info_ptr)
+{
+   png_debug(1, "in png_info_destroy");
+
+   png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
+
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+   if (png_ptr->num_chunk_list)
+   {
+      png_free(png_ptr, png_ptr->chunk_list);
+      png_ptr->chunk_list = NULL;
+      png_ptr->num_chunk_list = 0;
+   }
+#endif
+
+   png_info_init_3(&info_ptr, png_sizeof(png_info));
+}
+#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
+
+/* This function returns a pointer to the io_ptr associated with the user
+ * functions.  The application should free any memory associated with this
+ * pointer before png_write_destroy() or png_read_destroy() are called.
+ */
+png_voidp PNGAPI
+png_get_io_ptr(png_structp png_ptr)
+{
+   if (png_ptr == NULL)
+      return (NULL);
+   return (png_ptr->io_ptr);
+}
+
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
+#ifdef PNG_STDIO_SUPPORTED
+/* Initialize the default input/output functions for the PNG file.  If you
+ * use your own read or write routines, you can call either png_set_read_fn()
+ * or png_set_write_fn() instead of png_init_io().  If you have defined
+ * PNG_NO_STDIO, you must use a function of your own because "FILE *" isn't
+ * necessarily available.
+ */
+void PNGAPI
+png_init_io(png_structp png_ptr, png_FILE_p fp)
+{
+   png_debug(1, "in png_init_io");
+
+   if (png_ptr == NULL)
+      return;
+
+   png_ptr->io_ptr = (png_voidp)fp;
+}
+#endif
+
+#ifdef PNG_TIME_RFC1123_SUPPORTED
+/* Convert the supplied time into an RFC 1123 string suitable for use in
+ * a "Creation Time" or other text-based time string.
+ */
+png_charp PNGAPI
+png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
+{
+   static PNG_CONST char short_months[12][4] =
+        {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
+         "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
+
+   if (png_ptr == NULL)
+      return (NULL);
+   if (png_ptr->time_buffer == NULL)
+   {
+      png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29*
+         png_sizeof(char)));
+   }
+
+#ifdef _WIN32_WCE
+   {
+      wchar_t time_buf[29];
+      wsprintf(time_buf, TEXT("%d %S %d %02d:%02d:%02d +0000"),
+          ptime->day % 32, short_months[(ptime->month - 1) % 12],
+        ptime->year, ptime->hour % 24, ptime->minute % 60,
+          ptime->second % 61);
+      WideCharToMultiByte(CP_ACP, 0, time_buf, -1, png_ptr->time_buffer,
+          29, NULL, NULL);
+   }
+#else
+#ifdef USE_FAR_KEYWORD
+   {
+      char near_time_buf[29];
+      png_snprintf6(near_time_buf, 29, "%d %s %d %02d:%02d:%02d +0000",
+          ptime->day % 32, short_months[(ptime->month - 1) % 12],
+          ptime->year, ptime->hour % 24, ptime->minute % 60,
+          ptime->second % 61);
+      png_memcpy(png_ptr->time_buffer, near_time_buf,
+          29*png_sizeof(char));
+   }
+#else
+   png_snprintf6(png_ptr->time_buffer, 29, "%d %s %d %02d:%02d:%02d +0000",
+       ptime->day % 32, short_months[(ptime->month - 1) % 12],
+       ptime->year, ptime->hour % 24, ptime->minute % 60,
+       ptime->second % 61);
+#endif
+#endif /* _WIN32_WCE */
+   return ((png_charp)png_ptr->time_buffer);
+}
+#endif /* PNG_TIME_RFC1123_SUPPORTED */
+
+#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
+
+png_charp PNGAPI
+png_get_copyright(png_structp png_ptr)
+{
+   png_ptr = png_ptr;  /* Silence compiler warning about unused png_ptr */
+#ifdef PNG_STRING_COPYRIGHT
+      return PNG_STRING_COPYRIGHT
+#else
+#ifdef __STDC__
+   return ((png_charp) PNG_STRING_NEWLINE \
+     "libpng version 1.2.46 - July 9, 2011" PNG_STRING_NEWLINE \
+     "Copyright (c) 1998-2011 Glenn Randers-Pehrson" PNG_STRING_NEWLINE \
+     "Copyright (c) 1996-1997 Andreas Dilger" PNG_STRING_NEWLINE \
+     "Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc." \
+     PNG_STRING_NEWLINE);
+#else
+      return ((png_charp) "libpng version 1.2.46 - July 9, 2011\
+      Copyright (c) 1998-2011 Glenn Randers-Pehrson\
+      Copyright (c) 1996-1997 Andreas Dilger\
+      Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.");
+#endif
+#endif
+}
+
+/* The following return the library version as a short string in the
+ * format 1.0.0 through 99.99.99zz.  To get the version of *.h files
+ * used with your application, print out PNG_LIBPNG_VER_STRING, which
+ * is defined in png.h.
+ * Note: now there is no difference between png_get_libpng_ver() and
+ * png_get_header_ver().  Due to the version_nn_nn_nn typedef guard,
+ * it is guaranteed that png.c uses the correct version of png.h.
+ */
+png_charp PNGAPI
+png_get_libpng_ver(png_structp png_ptr)
+{
+   /* Version of *.c files used when building libpng */
+   png_ptr = png_ptr;  /* Silence compiler warning about unused png_ptr */
+   return ((png_charp) PNG_LIBPNG_VER_STRING);
+}
+
+png_charp PNGAPI
+png_get_header_ver(png_structp png_ptr)
+{
+   /* Version of *.h files used when building libpng */
+   png_ptr = png_ptr;  /* Silence compiler warning about unused png_ptr */
+   return ((png_charp) PNG_LIBPNG_VER_STRING);
+}
+
+png_charp PNGAPI
+png_get_header_version(png_structp png_ptr)
+{
+   /* Returns longer string containing both version and date */
+   png_ptr = png_ptr;  /* Silence compiler warning about unused png_ptr */
+#ifdef __STDC__
+   return ((png_charp) PNG_HEADER_VERSION_STRING
+#ifndef PNG_READ_SUPPORTED
+   "     (NO READ SUPPORT)"
+#endif
+   PNG_STRING_NEWLINE);
+#else
+   return ((png_charp) PNG_HEADER_VERSION_STRING);
+#endif
+}
+
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+int PNGAPI
+png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name)
+{
+   /* Check chunk_name and return "keep" value if it's on the list, else 0 */
+   int i;
+   png_bytep p;
+   if (png_ptr == NULL || chunk_name == NULL || png_ptr->num_chunk_list<=0)
+      return 0;
+   p = png_ptr->chunk_list + png_ptr->num_chunk_list*5 - 5;
+   for (i = png_ptr->num_chunk_list; i; i--, p -= 5)
+      if (!png_memcmp(chunk_name, p, 4))
+        return ((int)*(p + 4));
+   return 0;
+}
+#endif
+
+/* This function, added to libpng-1.0.6g, is untested. */
+int PNGAPI
+png_reset_zstream(png_structp png_ptr)
+{
+   if (png_ptr == NULL)
+      return Z_STREAM_ERROR;
+   return (inflateReset(&png_ptr->zstream));
+}
+#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
+
+/* This function was added to libpng-1.0.7 */
+png_uint_32 PNGAPI
+png_access_version_number(void)
+{
+   /* Version of *.c files used when building libpng */
+   return((png_uint_32) PNG_LIBPNG_VER);
+}
+
+
+#if defined(PNG_READ_SUPPORTED) && defined(PNG_ASSEMBLER_CODE_SUPPORTED)
+#ifndef PNG_1_0_X
+/* This function was added to libpng 1.2.0 */
+int PNGAPI
+png_mmx_support(void)
+{
+   /* Obsolete, to be removed from libpng-1.4.0 */
+    return -1;
+}
+#endif /* PNG_1_0_X */
+#endif /* PNG_READ_SUPPORTED && PNG_ASSEMBLER_CODE_SUPPORTED */
+
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
+#ifdef PNG_SIZE_T
+/* Added at libpng version 1.2.6 */
+   PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size));
+png_size_t PNGAPI
+png_convert_size(size_t size)
+{
+   if (size > (png_size_t)-1)
+      PNG_ABORT();  /* We haven't got access to png_ptr, so no png_error() */
+   return ((png_size_t)size);
+}
+#endif /* PNG_SIZE_T */
+
+/* Added at libpng version 1.2.34 and 1.4.0 (moved from pngset.c) */
+#ifdef PNG_cHRM_SUPPORTED
+#ifdef PNG_CHECK_cHRM_SUPPORTED
+
+/*
+ *    Multiply two 32-bit numbers, V1 and V2, using 32-bit
+ *    arithmetic, to produce a 64 bit result in the HI/LO words.
+ *
+ *                  A B
+ *                x C D
+ *               ------
+ *              AD || BD
+ *        AC || CB || 0
+ *
+ *    where A and B are the high and low 16-bit words of V1,
+ *    C and D are the 16-bit words of V2, AD is the product of
+ *    A and D, and X || Y is (X << 16) + Y.
+*/
+
+void /* PRIVATE */
+png_64bit_product (long v1, long v2, unsigned long *hi_product,
+   unsigned long *lo_product)
+{
+   int a, b, c, d;
+   long lo, hi, x, y;
+
+   a = (v1 >> 16) & 0xffff;
+   b = v1 & 0xffff;
+   c = (v2 >> 16) & 0xffff;
+   d = v2 & 0xffff;
+
+   lo = b * d;                   /* BD */
+   x = a * d + c * b;            /* AD + CB */
+   y = ((lo >> 16) & 0xffff) + x;
+
+   lo = (lo & 0xffff) | ((y & 0xffff) << 16);
+   hi = (y >> 16) & 0xffff;
+
+   hi += a * c;                  /* AC */
+
+   *hi_product = (unsigned long)hi;
+   *lo_product = (unsigned long)lo;
+}
+
+int /* PRIVATE */
+png_check_cHRM_fixed(png_structp png_ptr,
+   png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
+   png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
+   png_fixed_point blue_x, png_fixed_point blue_y)
+{
+   int ret = 1;
+   unsigned long xy_hi,xy_lo,yx_hi,yx_lo;
+
+   png_debug(1, "in function png_check_cHRM_fixed");
+
+   if (png_ptr == NULL)
+      return 0;
+
+   if (white_x < 0 || white_y <= 0 ||
+         red_x < 0 ||   red_y <  0 ||
+       green_x < 0 || green_y <  0 ||
+        blue_x < 0 ||  blue_y <  0)
+   {
+      png_warning(png_ptr,
+        "Ignoring attempt to set negative chromaticity value");
+      ret = 0;
+   }
+   if (white_x > (png_fixed_point) PNG_UINT_31_MAX ||
+       white_y > (png_fixed_point) PNG_UINT_31_MAX ||
+         red_x > (png_fixed_point) PNG_UINT_31_MAX ||
+         red_y > (png_fixed_point) PNG_UINT_31_MAX ||
+       green_x > (png_fixed_point) PNG_UINT_31_MAX ||
+       green_y > (png_fixed_point) PNG_UINT_31_MAX ||
+        blue_x > (png_fixed_point) PNG_UINT_31_MAX ||
+        blue_y > (png_fixed_point) PNG_UINT_31_MAX )
+   {
+      png_warning(png_ptr,
+        "Ignoring attempt to set chromaticity value exceeding 21474.83");
+      ret = 0;
+   }
+   if (white_x > 100000L - white_y)
+   {
+      png_warning(png_ptr, "Invalid cHRM white point");
+      ret = 0;
+   }
+   if (red_x > 100000L - red_y)
+   {
+      png_warning(png_ptr, "Invalid cHRM red point");
+      ret = 0;
+   }
+   if (green_x > 100000L - green_y)
+   {
+      png_warning(png_ptr, "Invalid cHRM green point");
+      ret = 0;
+   }
+   if (blue_x > 100000L - blue_y)
+   {
+      png_warning(png_ptr, "Invalid cHRM blue point");
+      ret = 0;
+   }
+
+   png_64bit_product(green_x - red_x, blue_y - red_y, &xy_hi, &xy_lo);
+   png_64bit_product(green_y - red_y, blue_x - red_x, &yx_hi, &yx_lo);
+
+   if (xy_hi == yx_hi && xy_lo == yx_lo)
+   {
+      png_warning(png_ptr,
+         "Ignoring attempt to set cHRM RGB triangle with zero area");
+      ret = 0;
+   }
+
+   return ret;
+}
+#endif /* PNG_CHECK_cHRM_SUPPORTED */
+#endif /* PNG_cHRM_SUPPORTED */
+
+void /* PRIVATE */
+png_check_IHDR(png_structp png_ptr,
+   png_uint_32 width, png_uint_32 height, int bit_depth,
+   int color_type, int interlace_type, int compression_type,
+   int filter_type)
+{
+   int error = 0;
+
+   /* Check for width and height valid values */
+   if (width == 0)
+   {
+      png_warning(png_ptr, "Image width is zero in IHDR");
+      error = 1;
+   }
+
+   if (height == 0)
+   {
+      png_warning(png_ptr, "Image height is zero in IHDR");
+      error = 1;
+   }
+
+#ifdef PNG_SET_USER_LIMITS_SUPPORTED
+   if (width > png_ptr->user_width_max || width > PNG_USER_WIDTH_MAX)
+#else
+   if (width > PNG_USER_WIDTH_MAX)
+#endif
+   {
+      png_warning(png_ptr, "Image width exceeds user limit in IHDR");
+      error = 1;
+   }
+
+#ifdef PNG_SET_USER_LIMITS_SUPPORTED
+   if (height > png_ptr->user_height_max || height > PNG_USER_HEIGHT_MAX)
+#else
+   if (height > PNG_USER_HEIGHT_MAX)
+#endif
+   {
+      png_warning(png_ptr, "Image height exceeds user limit in IHDR");
+      error = 1;
+   }
+
+   if (width > PNG_UINT_31_MAX)
+   {
+      png_warning(png_ptr, "Invalid image width in IHDR");
+      error = 1;
+   }
+
+   if ( height > PNG_UINT_31_MAX)
+   {
+      png_warning(png_ptr, "Invalid image height in IHDR");
+      error = 1;
+   }
+
+   if ( width > (PNG_UINT_32_MAX
+                 >> 3)      /* 8-byte RGBA pixels */
+                 - 64       /* bigrowbuf hack */
+                 - 1        /* filter byte */
+                 - 7*8      /* rounding of width to multiple of 8 pixels */
+                 - 8)       /* extra max_pixel_depth pad */
+      png_warning(png_ptr, "Width is too large for libpng to process pixels");
+
+   /* Check other values */
+   if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 &&
+       bit_depth != 8 && bit_depth != 16)
+   {
+      png_warning(png_ptr, "Invalid bit depth in IHDR");
+      error = 1;
+   }
+
+   if (color_type < 0 || color_type == 1 ||
+       color_type == 5 || color_type > 6)
+   {
+      png_warning(png_ptr, "Invalid color type in IHDR");
+      error = 1;
+   }
+
+   if (((color_type == PNG_COLOR_TYPE_PALETTE) && bit_depth > 8) ||
+       ((color_type == PNG_COLOR_TYPE_RGB ||
+         color_type == PNG_COLOR_TYPE_GRAY_ALPHA ||
+         color_type == PNG_COLOR_TYPE_RGB_ALPHA) && bit_depth < 8))
+   {
+      png_warning(png_ptr, "Invalid color type/bit depth combination in IHDR");
+      error = 1;
+   }
+
+   if (interlace_type >= PNG_INTERLACE_LAST)
+   {
+      png_warning(png_ptr, "Unknown interlace method in IHDR");
+      error = 1;
+   }
+
+   if (compression_type != PNG_COMPRESSION_TYPE_BASE)
+   {
+      png_warning(png_ptr, "Unknown compression method in IHDR");
+      error = 1;
+   }
+
+#ifdef PNG_MNG_FEATURES_SUPPORTED
+   /* Accept filter_method 64 (intrapixel differencing) only if
+    * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
+    * 2. Libpng did not read a PNG signature (this filter_method is only
+    *    used in PNG datastreams that are embedded in MNG datastreams) and
+    * 3. The application called png_permit_mng_features with a mask that
+    *    included PNG_FLAG_MNG_FILTER_64 and
+    * 4. The filter_method is 64 and
+    * 5. The color_type is RGB or RGBA
+    */
+   if ((png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) &&
+       png_ptr->mng_features_permitted)
+      png_warning(png_ptr, "MNG features are not allowed in a PNG datastream");
+
+   if (filter_type != PNG_FILTER_TYPE_BASE)
+   {
+      if (!((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+         (filter_type == PNG_INTRAPIXEL_DIFFERENCING) &&
+         ((png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) == 0) &&
+         (color_type == PNG_COLOR_TYPE_RGB ||
+         color_type == PNG_COLOR_TYPE_RGB_ALPHA)))
+      {
+         png_warning(png_ptr, "Unknown filter method in IHDR");
+         error = 1;
+      }
+
+      if (png_ptr->mode & PNG_HAVE_PNG_SIGNATURE)
+      {
+         png_warning(png_ptr, "Invalid filter method in IHDR");
+         error = 1;
+      }
+   }
+
+#else
+   if (filter_type != PNG_FILTER_TYPE_BASE)
+   {
+      png_warning(png_ptr, "Unknown filter method in IHDR");
+      error = 1;
+   }
+#endif
+
+   if (error == 1)
+      png_error(png_ptr, "Invalid IHDR data");
+}
+#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
diff --git a/src/libpng/png.h b/src/libpng/png.h
new file mode 100644
index 0000000..42e7013
--- /dev/null
+++ b/src/libpng/png.h
@@ -0,0 +1,3796 @@
+/* png.h - header file for PNG reference library
+ *
+ * libpng version 1.2.46 - July 9, 2011
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ *
+ * This code is released under the libpng license (See LICENSE, below)
+ *
+ * Authors and maintainers:
+ *  libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
+ *  libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
+ *  libpng versions 0.97, January 1998, through 1.2.46 - July 9, 2011: Glenn
+ *  See also "Contributing Authors", below.
+ *
+ * Note about libpng version numbers:
+ *
+ *    Due to various miscommunications, unforeseen code incompatibilities
+ *    and occasional factors outside the authors' control, version numbering
+ *    on the library has not always been consistent and straightforward.
+ *    The following table summarizes matters since version 0.89c, which was
+ *    the first widely used release:
+ *
+ *    source                 png.h  png.h  shared-lib
+ *    version                string   int  version
+ *    -------                ------ -----  ----------
+ *    0.89c "1.0 beta 3"     0.89      89  1.0.89
+ *    0.90  "1.0 beta 4"     0.90      90  0.90  [should have been 2.0.90]
+ *    0.95  "1.0 beta 5"     0.95      95  0.95  [should have been 2.0.95]
+ *    0.96  "1.0 beta 6"     0.96      96  0.96  [should have been 2.0.96]
+ *    0.97b "1.00.97 beta 7" 1.00.97   97  1.0.1 [should have been 2.0.97]
+ *    0.97c                  0.97      97  2.0.97
+ *    0.98                   0.98      98  2.0.98
+ *    0.99                   0.99      98  2.0.99
+ *    0.99a-m                0.99      99  2.0.99
+ *    1.00                   1.00     100  2.1.0 [100 should be 10000]
+ *    1.0.0      (from here on, the   100  2.1.0 [100 should be 10000]
+ *    1.0.1       png.h string is   10001  2.1.0
+ *    1.0.1a-e    identical to the  10002  from here on, the shared library
+ *    1.0.2       source version)   10002  is 2.V where V is the source code
+ *    1.0.2a-b                      10003  version, except as noted.
+ *    1.0.3                         10003
+ *    1.0.3a-d                      10004
+ *    1.0.4                         10004
+ *    1.0.4a-f                      10005
+ *    1.0.5 (+ 2 patches)           10005
+ *    1.0.5a-d                      10006
+ *    1.0.5e-r                      10100 (not source compatible)
+ *    1.0.5s-v                      10006 (not binary compatible)
+ *    1.0.6 (+ 3 patches)           10006 (still binary incompatible)
+ *    1.0.6d-f                      10007 (still binary incompatible)
+ *    1.0.6g                        10007
+ *    1.0.6h                        10007  10.6h (testing xy.z so-numbering)
+ *    1.0.6i                        10007  10.6i
+ *    1.0.6j                        10007  2.1.0.6j (incompatible with 1.0.0)
+ *    1.0.7beta11-14        DLLNUM  10007  2.1.0.7beta11-14 (binary compatible)
+ *    1.0.7beta15-18           1    10007  2.1.0.7beta15-18 (binary compatible)
+ *    1.0.7rc1-2               1    10007  2.1.0.7rc1-2 (binary compatible)
+ *    1.0.7                    1    10007  (still compatible)
+ *    1.0.8beta1-4             1    10008  2.1.0.8beta1-4
+ *    1.0.8rc1                 1    10008  2.1.0.8rc1
+ *    1.0.8                    1    10008  2.1.0.8
+ *    1.0.9beta1-6             1    10009  2.1.0.9beta1-6
+ *    1.0.9rc1                 1    10009  2.1.0.9rc1
+ *    1.0.9beta7-10            1    10009  2.1.0.9beta7-10
+ *    1.0.9rc2                 1    10009  2.1.0.9rc2
+ *    1.0.9                    1    10009  2.1.0.9
+ *    1.0.10beta1              1    10010  2.1.0.10beta1
+ *    1.0.10rc1                1    10010  2.1.0.10rc1
+ *    1.0.10                   1    10010  2.1.0.10
+ *    1.0.11beta1-3            1    10011  2.1.0.11beta1-3
+ *    1.0.11rc1                1    10011  2.1.0.11rc1
+ *    1.0.11                   1    10011  2.1.0.11
+ *    1.0.12beta1-2            2    10012  2.1.0.12beta1-2
+ *    1.0.12rc1                2    10012  2.1.0.12rc1
+ *    1.0.12                   2    10012  2.1.0.12
+ *    1.1.0a-f                 -    10100  2.1.1.0a-f (branch abandoned)
+ *    1.2.0beta1-2             2    10200  2.1.2.0beta1-2
+ *    1.2.0beta3-5             3    10200  3.1.2.0beta3-5
+ *    1.2.0rc1                 3    10200  3.1.2.0rc1
+ *    1.2.0                    3    10200  3.1.2.0
+ *    1.2.1beta1-4             3    10201  3.1.2.1beta1-4
+ *    1.2.1rc1-2               3    10201  3.1.2.1rc1-2
+ *    1.2.1                    3    10201  3.1.2.1
+ *    1.2.2beta1-6            12    10202  12.so.0.1.2.2beta1-6
+ *    1.0.13beta1             10    10013  10.so.0.1.0.13beta1
+ *    1.0.13rc1               10    10013  10.so.0.1.0.13rc1
+ *    1.2.2rc1                12    10202  12.so.0.1.2.2rc1
+ *    1.0.13                  10    10013  10.so.0.1.0.13
+ *    1.2.2                   12    10202  12.so.0.1.2.2
+ *    1.2.3rc1-6              12    10203  12.so.0.1.2.3rc1-6
+ *    1.2.3                   12    10203  12.so.0.1.2.3
+ *    1.2.4beta1-3            13    10204  12.so.0.1.2.4beta1-3
+ *    1.0.14rc1               13    10014  10.so.0.1.0.14rc1
+ *    1.2.4rc1                13    10204  12.so.0.1.2.4rc1
+ *    1.0.14                  10    10014  10.so.0.1.0.14
+ *    1.2.4                   13    10204  12.so.0.1.2.4
+ *    1.2.5beta1-2            13    10205  12.so.0.1.2.5beta1-2
+ *    1.0.15rc1-3             10    10015  10.so.0.1.0.15rc1-3
+ *    1.2.5rc1-3              13    10205  12.so.0.1.2.5rc1-3
+ *    1.0.15                  10    10015  10.so.0.1.0.15
+ *    1.2.5                   13    10205  12.so.0.1.2.5
+ *    1.2.6beta1-4            13    10206  12.so.0.1.2.6beta1-4
+ *    1.0.16                  10    10016  10.so.0.1.0.16
+ *    1.2.6                   13    10206  12.so.0.1.2.6
+ *    1.2.7beta1-2            13    10207  12.so.0.1.2.7beta1-2
+ *    1.0.17rc1               10    10017  10.so.0.1.0.17rc1
+ *    1.2.7rc1                13    10207  12.so.0.1.2.7rc1
+ *    1.0.17                  10    10017  10.so.0.1.0.17
+ *    1.2.7                   13    10207  12.so.0.1.2.7
+ *    1.2.8beta1-5            13    10208  12.so.0.1.2.8beta1-5
+ *    1.0.18rc1-5             10    10018  10.so.0.1.0.18rc1-5
+ *    1.2.8rc1-5              13    10208  12.so.0.1.2.8rc1-5
+ *    1.0.18                  10    10018  10.so.0.1.0.18
+ *    1.2.8                   13    10208  12.so.0.1.2.8
+ *    1.2.9beta1-3            13    10209  12.so.0.1.2.9beta1-3
+ *    1.2.9beta4-11           13    10209  12.so.0.9[.0]
+ *    1.2.9rc1                13    10209  12.so.0.9[.0]
+ *    1.2.9                   13    10209  12.so.0.9[.0]
+ *    1.2.10beta1-8           13    10210  12.so.0.10[.0]
+ *    1.2.10rc1-3             13    10210  12.so.0.10[.0]
+ *    1.2.10                  13    10210  12.so.0.10[.0]
+ *    1.2.11beta1-4           13    10211  12.so.0.11[.0]
+ *    1.0.19rc1-5             10    10019  10.so.0.19[.0]
+ *    1.2.11rc1-5             13    10211  12.so.0.11[.0]
+ *    1.0.19                  10    10019  10.so.0.19[.0]
+ *    1.2.11                  13    10211  12.so.0.11[.0]
+ *    1.0.20                  10    10020  10.so.0.20[.0]
+ *    1.2.12                  13    10212  12.so.0.12[.0]
+ *    1.2.13beta1             13    10213  12.so.0.13[.0]
+ *    1.0.21                  10    10021  10.so.0.21[.0]
+ *    1.2.13                  13    10213  12.so.0.13[.0]
+ *    1.2.14beta1-2           13    10214  12.so.0.14[.0]
+ *    1.0.22rc1               10    10022  10.so.0.22[.0]
+ *    1.2.14rc1               13    10214  12.so.0.14[.0]
+ *    1.0.22                  10    10022  10.so.0.22[.0]
+ *    1.2.14                  13    10214  12.so.0.14[.0]
+ *    1.2.15beta1-6           13    10215  12.so.0.15[.0]
+ *    1.0.23rc1-5             10    10023  10.so.0.23[.0]
+ *    1.2.15rc1-5             13    10215  12.so.0.15[.0]
+ *    1.0.23                  10    10023  10.so.0.23[.0]
+ *    1.2.15                  13    10215  12.so.0.15[.0]
+ *    1.2.16beta1-2           13    10216  12.so.0.16[.0]
+ *    1.2.16rc1               13    10216  12.so.0.16[.0]
+ *    1.0.24                  10    10024  10.so.0.24[.0]
+ *    1.2.16                  13    10216  12.so.0.16[.0]
+ *    1.2.17beta1-2           13    10217  12.so.0.17[.0]
+ *    1.0.25rc1               10    10025  10.so.0.25[.0]
+ *    1.2.17rc1-3             13    10217  12.so.0.17[.0]
+ *    1.0.25                  10    10025  10.so.0.25[.0]
+ *    1.2.17                  13    10217  12.so.0.17[.0]
+ *    1.0.26                  10    10026  10.so.0.26[.0]
+ *    1.2.18                  13    10218  12.so.0.18[.0]
+ *    1.2.19beta1-31          13    10219  12.so.0.19[.0]
+ *    1.0.27rc1-6             10    10027  10.so.0.27[.0]
+ *    1.2.19rc1-6             13    10219  12.so.0.19[.0]
+ *    1.0.27                  10    10027  10.so.0.27[.0]
+ *    1.2.19                  13    10219  12.so.0.19[.0]
+ *    1.2.20beta01-04         13    10220  12.so.0.20[.0]
+ *    1.0.28rc1-6             10    10028  10.so.0.28[.0]
+ *    1.2.20rc1-6             13    10220  12.so.0.20[.0]
+ *    1.0.28                  10    10028  10.so.0.28[.0]
+ *    1.2.20                  13    10220  12.so.0.20[.0]
+ *    1.2.21beta1-2           13    10221  12.so.0.21[.0]
+ *    1.2.21rc1-3             13    10221  12.so.0.21[.0]
+ *    1.0.29                  10    10029  10.so.0.29[.0]
+ *    1.2.21                  13    10221  12.so.0.21[.0]
+ *    1.2.22beta1-4           13    10222  12.so.0.22[.0]
+ *    1.0.30rc1               10    10030  10.so.0.30[.0]
+ *    1.2.22rc1               13    10222  12.so.0.22[.0]
+ *    1.0.30                  10    10030  10.so.0.30[.0]
+ *    1.2.22                  13    10222  12.so.0.22[.0]
+ *    1.2.23beta01-05         13    10223  12.so.0.23[.0]
+ *    1.2.23rc01              13    10223  12.so.0.23[.0]
+ *    1.2.23                  13    10223  12.so.0.23[.0]
+ *    1.2.24beta01-02         13    10224  12.so.0.24[.0]
+ *    1.2.24rc01              13    10224  12.so.0.24[.0]
+ *    1.2.24                  13    10224  12.so.0.24[.0]
+ *    1.2.25beta01-06         13    10225  12.so.0.25[.0]
+ *    1.2.25rc01-02           13    10225  12.so.0.25[.0]
+ *    1.0.31                  10    10031  10.so.0.31[.0]
+ *    1.2.25                  13    10225  12.so.0.25[.0]
+ *    1.2.26beta01-06         13    10226  12.so.0.26[.0]
+ *    1.2.26rc01              13    10226  12.so.0.26[.0]
+ *    1.2.26                  13    10226  12.so.0.26[.0]
+ *    1.0.32                  10    10032  10.so.0.32[.0]
+ *    1.2.27beta01-06         13    10227  12.so.0.27[.0]
+ *    1.2.27rc01              13    10227  12.so.0.27[.0]
+ *    1.0.33                  10    10033  10.so.0.33[.0]
+ *    1.2.27                  13    10227  12.so.0.27[.0]
+ *    1.0.34                  10    10034  10.so.0.34[.0]
+ *    1.2.28                  13    10228  12.so.0.28[.0]
+ *    1.2.29beta01-03         13    10229  12.so.0.29[.0]
+ *    1.2.29rc01              13    10229  12.so.0.29[.0]
+ *    1.0.35                  10    10035  10.so.0.35[.0]
+ *    1.2.29                  13    10229  12.so.0.29[.0]
+ *    1.0.37                  10    10037  10.so.0.37[.0]
+ *    1.2.30beta01-04         13    10230  12.so.0.30[.0]
+ *    1.0.38rc01-08           10    10038  10.so.0.38[.0]
+ *    1.2.30rc01-08           13    10230  12.so.0.30[.0]
+ *    1.0.38                  10    10038  10.so.0.38[.0]
+ *    1.2.30                  13    10230  12.so.0.30[.0]
+ *    1.0.39rc01-03           10    10039  10.so.0.39[.0]
+ *    1.2.31rc01-03           13    10231  12.so.0.31[.0]
+ *    1.0.39                  10    10039  10.so.0.39[.0]
+ *    1.2.31                  13    10231  12.so.0.31[.0]
+ *    1.2.32beta01-02         13    10232  12.so.0.32[.0]
+ *    1.0.40rc01              10    10040  10.so.0.40[.0]
+ *    1.2.32rc01              13    10232  12.so.0.32[.0]
+ *    1.0.40                  10    10040  10.so.0.40[.0]
+ *    1.2.32                  13    10232  12.so.0.32[.0]
+ *    1.2.33beta01-02         13    10233  12.so.0.33[.0]
+ *    1.2.33rc01-02           13    10233  12.so.0.33[.0]
+ *    1.0.41rc01              10    10041  10.so.0.41[.0]
+ *    1.2.33                  13    10233  12.so.0.33[.0]
+ *    1.0.41                  10    10041  10.so.0.41[.0]
+ *    1.2.34beta01-07         13    10234  12.so.0.34[.0]
+ *    1.0.42rc01              10    10042  10.so.0.42[.0]
+ *    1.2.34rc01              13    10234  12.so.0.34[.0]
+ *    1.0.42                  10    10042  10.so.0.42[.0]
+ *    1.2.34                  13    10234  12.so.0.34[.0]
+ *    1.2.35beta01-03         13    10235  12.so.0.35[.0]
+ *    1.0.43rc01-02           10    10043  10.so.0.43[.0]
+ *    1.2.35rc01-02           13    10235  12.so.0.35[.0]
+ *    1.0.43                  10    10043  10.so.0.43[.0]
+ *    1.2.35                  13    10235  12.so.0.35[.0]
+ *    1.2.36beta01-05         13    10236  12.so.0.36[.0]
+ *    1.2.36rc01              13    10236  12.so.0.36[.0]
+ *    1.0.44                  10    10044  10.so.0.44[.0]
+ *    1.2.36                  13    10236  12.so.0.36[.0]
+ *    1.2.37beta01-03         13    10237  12.so.0.37[.0]
+ *    1.2.37rc01              13    10237  12.so.0.37[.0]
+ *    1.2.37                  13    10237  12.so.0.37[.0]
+ *    1.0.45                  10    10045  12.so.0.45[.0]
+ *    1.0.46                  10    10046  10.so.0.46[.0]
+ *    1.2.38beta01            13    10238  12.so.0.38[.0]
+ *    1.2.38rc01-03           13    10238  12.so.0.38[.0]
+ *    1.0.47                  10    10047  10.so.0.47[.0]
+ *    1.2.38                  13    10238  12.so.0.38[.0]
+ *    1.2.39beta01-05         13    10239  12.so.0.39[.0]
+ *    1.2.39rc01              13    10239  12.so.0.39[.0]
+ *    1.0.48                  10    10048  10.so.0.48[.0]
+ *    1.2.39                  13    10239  12.so.0.39[.0]
+ *    1.2.40beta01            13    10240  12.so.0.40[.0]
+ *    1.2.40rc01              13    10240  12.so.0.40[.0]
+ *    1.0.49                  10    10049  10.so.0.49[.0]
+ *    1.2.40                  13    10240  12.so.0.40[.0]
+ *    1.2.41beta01-18         13    10241  12.so.0.41[.0]
+ *    1.0.51rc01              10    10051  10.so.0.51[.0]
+ *    1.2.41rc01-03           13    10241  12.so.0.41[.0]
+ *    1.0.51                  10    10051  10.so.0.51[.0]
+ *    1.2.41                  13    10241  12.so.0.41[.0]
+ *    1.2.42beta01-02         13    10242  12.so.0.42[.0]
+ *    1.2.42rc01-05           13    10242  12.so.0.42[.0]
+ *    1.0.52                  10    10052  10.so.0.52[.0]
+ *    1.2.42                  13    10242  12.so.0.42[.0]
+ *    1.2.43beta01-05         13    10243  12.so.0.43[.0]
+ *    1.0.53rc01-02           10    10053  10.so.0.53[.0]
+ *    1.2.43rc01-02           13    10243  12.so.0.43[.0]
+ *    1.0.53                  10    10053  10.so.0.53[.0]
+ *    1.2.43                  13    10243  12.so.0.43[.0]
+ *    1.2.44beta01-03         13    10244  12.so.0.44[.0]
+ *    1.2.44rc01-03           13    10244  12.so.0.44[.0]
+ *    1.2.44                  13    10244  12.so.0.44[.0]
+ *    1.2.45beta01-03         13    10245  12.so.0.45[.0]
+ *    1.0.55rc01              10    10055  10.so.0.55[.0]
+ *    1.2.45rc01              13    10245  12.so.0.45[.0]
+ *    1.0.55                  10    10055  10.so.0.55[.0]
+ *    1.2.45                  13    10245  12.so.0.45[.0]
+ *    1.2.46rc01-02           13    10246  12.so.0.46[.0]
+ *    1.0.56                  10    10056  10.so.0.56[.0]
+ *    1.2.46                  13    10246  12.so.0.46[.0]
+ *
+ *    Henceforth the source version will match the shared-library major
+ *    and minor numbers; the shared-library major version number will be
+ *    used for changes in backward compatibility, as it is intended.  The
+ *    PNG_LIBPNG_VER macro, which is not used within libpng but is available
+ *    for applications, is an unsigned integer of the form xyyzz corresponding
+ *    to the source version x.y.z (leading zeros in y and z).  Beta versions
+ *    were given the previous public release number plus a letter, until
+ *    version 1.0.6j; from then on they were given the upcoming public
+ *    release number plus "betaNN" or "rcNN".
+ *
+ *    Binary incompatibility exists only when applications make direct access
+ *    to the info_ptr or png_ptr members through png.h, and the compiled
+ *    application is loaded with a different version of the library.
+ *
+ *    DLLNUM will change each time there are forward or backward changes
+ *    in binary compatibility (e.g., when a new feature is added).
+ *
+ * See libpng.txt or libpng.3 for more information.  The PNG specification
+ * is available as a W3C Recommendation and as an ISO Specification,
+ * <http://www.w3.org/TR/2003/REC-PNG-20031110/
+ */
+
+/*
+ * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
+ *
+ * If you modify libpng you may insert additional notices immediately following
+ * this sentence.
+ *
+ * This code is released under the libpng license.
+ *
+ * libpng versions 1.2.6, August 15, 2004, through 1.2.46, July 9, 2011, are
+ * Copyright (c) 2004, 2006-2011 Glenn Randers-Pehrson, and are
+ * distributed according to the same disclaimer and license as libpng-1.2.5
+ * with the following individual added to the list of Contributing Authors:
+ *
+ *    Cosmin Truta
+ *
+ * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are
+ * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
+ * distributed according to the same disclaimer and license as libpng-1.0.6
+ * with the following individuals added to the list of Contributing Authors:
+ *
+ *    Simon-Pierre Cadieux
+ *    Eric S. Raymond
+ *    Gilles Vollant
+ *
+ * and with the following additions to the disclaimer:
+ *
+ *    There is no warranty against interference with your enjoyment of the
+ *    library or against infringement.  There is no warranty that our
+ *    efforts or the library will fulfill any of your particular purposes
+ *    or needs.  This library is provided with all faults, and the entire
+ *    risk of satisfactory quality, performance, accuracy, and effort is with
+ *    the user.
+ *
+ * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
+ * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are
+ * distributed according to the same disclaimer and license as libpng-0.96,
+ * with the following individuals added to the list of Contributing Authors:
+ *
+ *    Tom Lane
+ *    Glenn Randers-Pehrson
+ *    Willem van Schaik
+ *
+ * libpng versions 0.89, June 1996, through 0.96, May 1997, are
+ * Copyright (c) 1996, 1997 Andreas Dilger
+ * Distributed according to the same disclaimer and license as libpng-0.88,
+ * with the following individuals added to the list of Contributing Authors:
+ *
+ *    John Bowler
+ *    Kevin Bracey
+ *    Sam Bushell
+ *    Magnus Holmgren
+ *    Greg Roelofs
+ *    Tom Tanner
+ *
+ * libpng versions 0.5, May 1995, through 0.88, January 1996, are
+ * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
+ *
+ * For the purposes of this copyright and license, "Contributing Authors"
+ * is defined as the following set of individuals:
+ *
+ *    Andreas Dilger
+ *    Dave Martindale
+ *    Guy Eric Schalnat
+ *    Paul Schmidt
+ *    Tim Wegner
+ *
+ * The PNG Reference Library is supplied "AS IS".  The Contributing Authors
+ * and Group 42, Inc. disclaim all warranties, expressed or implied,
+ * including, without limitation, the warranties of merchantability and of
+ * fitness for any purpose.  The Contributing Authors and Group 42, Inc.
+ * assume no liability for direct, indirect, incidental, special, exemplary,
+ * or consequential damages, which may result from the use of the PNG
+ * Reference Library, even if advised of the possibility of such damage.
+ *
+ * Permission is hereby granted to use, copy, modify, and distribute this
+ * source code, or portions hereof, for any purpose, without fee, subject
+ * to the following restrictions:
+ *
+ * 1. The origin of this source code must not be misrepresented.
+ *
+ * 2. Altered versions must be plainly marked as such and
+ * must not be misrepresented as being the original source.
+ *
+ * 3. This Copyright notice may not be removed or altered from
+ *    any source or altered source distribution.
+ *
+ * The Contributing Authors and Group 42, Inc. specifically permit, without
+ * fee, and encourage the use of this source code as a component to
+ * supporting the PNG file format in commercial products.  If you use this
+ * source code in a product, acknowledgment is not required but would be
+ * appreciated.
+ */
+
+/*
+ * A "png_get_copyright" function is available, for convenient use in "about"
+ * boxes and the like:
+ *
+ * printf("%s",png_get_copyright(NULL));
+ *
+ * Also, the PNG logo (in PNG format, of course) is supplied in the
+ * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
+ */
+
+/*
+ * Libpng is OSI Certified Open Source Software.  OSI Certified is a
+ * certification mark of the Open Source Initiative.
+ */
+
+/*
+ * The contributing authors would like to thank all those who helped
+ * with testing, bug fixes, and patience.  This wouldn't have been
+ * possible without all of you.
+ *
+ * Thanks to Frank J. T. Wojcik for helping with the documentation.
+ */
+
+/*
+ * Y2K compliance in libpng:
+ * =========================
+ *
+ *    July 9, 2011
+ *
+ *    Since the PNG Development group is an ad-hoc body, we can't make
+ *    an official declaration.
+ *
+ *    This is your unofficial assurance that libpng from version 0.71 and
+ *    upward through 1.2.46 are Y2K compliant.  It is my belief that earlier
+ *    versions were also Y2K compliant.
+ *
+ *    Libpng only has three year fields.  One is a 2-byte unsigned integer
+ *    that will hold years up to 65535.  The other two hold the date in text
+ *    format, and will hold years up to 9999.
+ *
+ *    The integer is
+ *        "png_uint_16 year" in png_time_struct.
+ *
+ *    The strings are
+ *        "png_charp time_buffer" in png_struct and
+ *        "near_time_buffer", which is a local character string in png.c.
+ *
+ *    There are seven time-related functions:
+ *        png.c: png_convert_to_rfc_1123() in png.c
+ *          (formerly png_convert_to_rfc_1152() in error)
+ *        png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
+ *        png_convert_from_time_t() in pngwrite.c
+ *        png_get_tIME() in pngget.c
+ *        png_handle_tIME() in pngrutil.c, called in pngread.c
+ *        png_set_tIME() in pngset.c
+ *        png_write_tIME() in pngwutil.c, called in pngwrite.c
+ *
+ *    All handle dates properly in a Y2K environment.  The
+ *    png_convert_from_time_t() function calls gmtime() to convert from system
+ *    clock time, which returns (year - 1900), which we properly convert to
+ *    the full 4-digit year.  There is a possibility that applications using
+ *    libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
+ *    function, or that they are incorrectly passing only a 2-digit year
+ *    instead of "year - 1900" into the png_convert_from_struct_tm() function,
+ *    but this is not under our control.  The libpng documentation has always
+ *    stated that it works with 4-digit years, and the APIs have been
+ *    documented as such.
+ *
+ *    The tIME chunk itself is also Y2K compliant.  It uses a 2-byte unsigned
+ *    integer to hold the year, and can hold years as large as 65535.
+ *
+ *    zlib, upon which libpng depends, is also Y2K compliant.  It contains
+ *    no date-related code.
+ *
+ *       Glenn Randers-Pehrson
+ *       libpng maintainer
+ *       PNG Development Group
+ */
+
+#ifndef PNG_H
+#define PNG_H
+
+/* This is not the place to learn how to use libpng.  The file libpng.txt
+ * describes how to use libpng, and the file example.c summarizes it
+ * with some code on which to build.  This file is useful for looking
+ * at the actual function definitions and structure components.
+ */
+
+/* Version information for png.h - this should match the version in png.c */
+#define PNG_LIBPNG_VER_STRING "1.2.46"
+#define PNG_HEADER_VERSION_STRING \
+   " libpng version 1.2.46 - July 9, 2011\n"
+
+#define PNG_LIBPNG_VER_SONUM   0
+#define PNG_LIBPNG_VER_DLLNUM  13
+
+/* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
+#define PNG_LIBPNG_VER_MAJOR   1
+#define PNG_LIBPNG_VER_MINOR   2
+#define PNG_LIBPNG_VER_RELEASE 46
+/* This should match the numeric part of the final component of
+ * PNG_LIBPNG_VER_STRING, omitting any leading zero:
+ */
+
+#define PNG_LIBPNG_VER_BUILD  0
+
+/* Release Status */
+#define PNG_LIBPNG_BUILD_ALPHA    1
+#define PNG_LIBPNG_BUILD_BETA     2
+#define PNG_LIBPNG_BUILD_RC       3
+#define PNG_LIBPNG_BUILD_STABLE   4
+#define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
+
+/* Release-Specific Flags */
+#define PNG_LIBPNG_BUILD_PATCH    8 /* Can be OR'ed with
+                                       PNG_LIBPNG_BUILD_STABLE only */
+#define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with
+                                       PNG_LIBPNG_BUILD_SPECIAL */
+#define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
+                                       PNG_LIBPNG_BUILD_PRIVATE */
+
+#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
+
+/* Careful here.  At one time, Guy wanted to use 082, but that would be octal.
+ * We must not include leading zeros.
+ * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
+ * version 1.0.0 was mis-numbered 100 instead of 10000).  From
+ * version 1.0.1 it's    xxyyzz, where x=major, y=minor, z=release
+ */
+#define PNG_LIBPNG_VER 10246 /* 1.2.46 */
+
+#ifndef PNG_VERSION_INFO_ONLY
+/* Include the compression library's header */
+#include "zlib.h"
+#endif
+
+/* Include all user configurable info, including optional assembler routines */
+#include "pngconf.h"
+
+/*
+ * Added at libpng-1.2.8 */
+/* Ref MSDN: Private as priority over Special
+ * VS_FF_PRIVATEBUILD File *was not* built using standard release
+ * procedures. If this value is given, the StringFileInfo block must
+ * contain a PrivateBuild string.
+ *
+ * VS_FF_SPECIALBUILD File *was* built by the original company using
+ * standard release procedures but is a variation of the standard
+ * file of the same version number. If this value is given, the
+ * StringFileInfo block must contain a SpecialBuild string.
+ */
+
+#ifdef PNG_USER_PRIVATEBUILD
+#  define PNG_LIBPNG_BUILD_TYPE \
+          (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
+#else
+#  ifdef PNG_LIBPNG_SPECIALBUILD
+#    define PNG_LIBPNG_BUILD_TYPE \
+            (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
+#  else
+#    define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
+#  endif
+#endif
+
+#ifndef PNG_VERSION_INFO_ONLY
+
+/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/* This file is arranged in several sections.  The first section contains
+ * structure and type definitions.  The second section contains the external
+ * library functions, while the third has the internal library functions,
+ * which applications aren't expected to use directly.
+ */
+
+#ifndef PNG_NO_TYPECAST_NULL
+#define int_p_NULL                (int *)NULL
+#define png_bytep_NULL            (png_bytep)NULL
+#define png_bytepp_NULL           (png_bytepp)NULL
+#define png_doublep_NULL          (png_doublep)NULL
+#define png_error_ptr_NULL        (png_error_ptr)NULL
+#define png_flush_ptr_NULL        (png_flush_ptr)NULL
+#define png_free_ptr_NULL         (png_free_ptr)NULL
+#define png_infopp_NULL           (png_infopp)NULL
+#define png_malloc_ptr_NULL       (png_malloc_ptr)NULL
+#define png_read_status_ptr_NULL  (png_read_status_ptr)NULL
+#define png_rw_ptr_NULL           (png_rw_ptr)NULL
+#define png_structp_NULL          (png_structp)NULL
+#define png_uint_16p_NULL         (png_uint_16p)NULL
+#define png_voidp_NULL            (png_voidp)NULL
+#define png_write_status_ptr_NULL (png_write_status_ptr)NULL
+#else
+#define int_p_NULL                NULL
+#define png_bytep_NULL            NULL
+#define png_bytepp_NULL           NULL
+#define png_doublep_NULL          NULL
+#define png_error_ptr_NULL        NULL
+#define png_flush_ptr_NULL        NULL
+#define png_free_ptr_NULL         NULL
+#define png_infopp_NULL           NULL
+#define png_malloc_ptr_NULL       NULL
+#define png_read_status_ptr_NULL  NULL
+#define png_rw_ptr_NULL           NULL
+#define png_structp_NULL          NULL
+#define png_uint_16p_NULL         NULL
+#define png_voidp_NULL            NULL
+#define png_write_status_ptr_NULL NULL
+#endif
+
+/* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */
+#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
+/* Version information for C files, stored in png.c.  This had better match
+ * the version above.
+ */
+#ifdef PNG_USE_GLOBAL_ARRAYS
+PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18];
+  /* Need room for 99.99.99beta99z */
+#else
+#define png_libpng_ver png_get_header_ver(NULL)
+#endif
+
+#ifdef PNG_USE_GLOBAL_ARRAYS
+/* This was removed in version 1.0.5c */
+/* Structures to facilitate easy interlacing.  See png.c for more details */
+PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_start[7];
+PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7];
+PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7];
+PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7];
+PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7];
+PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7];
+/* This isn't currently used.  If you need it, see png.c for more details.
+PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7];
+*/
+#endif
+
+#endif /* PNG_NO_EXTERN */
+
+/* Three color definitions.  The order of the red, green, and blue, (and the
+ * exact size) is not important, although the size of the fields need to
+ * be png_byte or png_uint_16 (as defined below).
+ */
+typedef struct png_color_struct
+{
+   png_byte red;
+   png_byte green;
+   png_byte blue;
+} png_color;
+typedef png_color FAR * png_colorp;
+typedef png_color FAR * FAR * png_colorpp;
+
+typedef struct png_color_16_struct
+{
+   png_byte index;    /* used for palette files */
+   png_uint_16 red;   /* for use in red green blue files */
+   png_uint_16 green;
+   png_uint_16 blue;
+   png_uint_16 gray;  /* for use in grayscale files */
+} png_color_16;
+typedef png_color_16 FAR * png_color_16p;
+typedef png_color_16 FAR * FAR * png_color_16pp;
+
+typedef struct png_color_8_struct
+{
+   png_byte red;   /* for use in red green blue files */
+   png_byte green;
+   png_byte blue;
+   png_byte gray;  /* for use in grayscale files */
+   png_byte alpha; /* for alpha channel files */
+} png_color_8;
+typedef png_color_8 FAR * png_color_8p;
+typedef png_color_8 FAR * FAR * png_color_8pp;
+
+/*
+ * The following two structures are used for the in-core representation
+ * of sPLT chunks.
+ */
+typedef struct png_sPLT_entry_struct
+{
+   png_uint_16 red;
+   png_uint_16 green;
+   png_uint_16 blue;
+   png_uint_16 alpha;
+   png_uint_16 frequency;
+} png_sPLT_entry;
+typedef png_sPLT_entry FAR * png_sPLT_entryp;
+typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp;
+
+/*  When the depth of the sPLT palette is 8 bits, the color and alpha samples
+ *  occupy the LSB of their respective members, and the MSB of each member
+ *  is zero-filled.  The frequency member always occupies the full 16 bits.
+ */
+
+typedef struct png_sPLT_struct
+{
+   png_charp name;           /* palette name */
+   png_byte depth;           /* depth of palette samples */
+   png_sPLT_entryp entries;  /* palette entries */
+   png_int_32 nentries;      /* number of palette entries */
+} png_sPLT_t;
+typedef png_sPLT_t FAR * png_sPLT_tp;
+typedef png_sPLT_t FAR * FAR * png_sPLT_tpp;
+
+#ifdef PNG_TEXT_SUPPORTED
+/* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
+ * and whether that contents is compressed or not.  The "key" field
+ * points to a regular zero-terminated C string.  The "text", "lang", and
+ * "lang_key" fields can be regular C strings, empty strings, or NULL pointers.
+ * However, the * structure returned by png_get_text() will always contain
+ * regular zero-terminated C strings (possibly empty), never NULL pointers,
+ * so they can be safely used in printf() and other string-handling functions.
+ */
+typedef struct png_text_struct
+{
+   int  compression;       /* compression value:
+                             -1: tEXt, none
+                              0: zTXt, deflate
+                              1: iTXt, none
+                              2: iTXt, deflate  */
+   png_charp key;          /* keyword, 1-79 character description of "text" */
+   png_charp text;         /* comment, may be an empty string (ie "")
+                              or a NULL pointer */
+   png_size_t text_length; /* length of the text string */
+#ifdef PNG_iTXt_SUPPORTED
+   png_size_t itxt_length; /* length of the itxt string */
+   png_charp lang;         /* language code, 0-79 characters
+                              or a NULL pointer */
+   png_charp lang_key;     /* keyword translated UTF-8 string, 0 or more
+                              chars or a NULL pointer */
+#endif
+} png_text;
+typedef png_text FAR * png_textp;
+typedef png_text FAR * FAR * png_textpp;
+#endif
+
+/* Supported compression types for text in PNG files (tEXt, and zTXt).
+ * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed.
+ */
+#define PNG_TEXT_COMPRESSION_NONE_WR -3
+#define PNG_TEXT_COMPRESSION_zTXt_WR -2
+#define PNG_TEXT_COMPRESSION_NONE    -1
+#define PNG_TEXT_COMPRESSION_zTXt     0
+#define PNG_ITXT_COMPRESSION_NONE     1
+#define PNG_ITXT_COMPRESSION_zTXt     2
+#define PNG_TEXT_COMPRESSION_LAST     3  /* Not a valid value */
+
+/* png_time is a way to hold the time in an machine independent way.
+ * Two conversions are provided, both from time_t and struct tm.  There
+ * is no portable way to convert to either of these structures, as far
+ * as I know.  If you know of a portable way, send it to me.  As a side
+ * note - PNG has always been Year 2000 compliant!
+ */
+typedef struct png_time_struct
+{
+   png_uint_16 year; /* full year, as in, 1995 */
+   png_byte month;   /* month of year, 1 - 12 */
+   png_byte day;     /* day of month, 1 - 31 */
+   png_byte hour;    /* hour of day, 0 - 23 */
+   png_byte minute;  /* minute of hour, 0 - 59 */
+   png_byte second;  /* second of minute, 0 - 60 (for leap seconds) */
+} png_time;
+typedef png_time FAR * png_timep;
+typedef png_time FAR * FAR * png_timepp;
+
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \
+ defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
+/* png_unknown_chunk is a structure to hold queued chunks for which there is
+ * no specific support.  The idea is that we can use this to queue
+ * up private chunks for output even though the library doesn't actually
+ * know about their semantics.
+ */
+#define PNG_CHUNK_NAME_LENGTH 5
+typedef struct png_unknown_chunk_t
+{
+    png_byte name[PNG_CHUNK_NAME_LENGTH];
+    png_byte *data;
+    png_size_t size;
+
+    /* libpng-using applications should NOT directly modify this byte. */
+    png_byte location; /* mode of operation at read time */
+}
+png_unknown_chunk;
+typedef png_unknown_chunk FAR * png_unknown_chunkp;
+typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
+#endif
+
+/* png_info is a structure that holds the information in a PNG file so
+ * that the application can find out the characteristics of the image.
+ * If you are reading the file, this structure will tell you what is
+ * in the PNG file.  If you are writing the file, fill in the information
+ * you want to put into the PNG file, then call png_write_info().
+ * The names chosen should be very close to the PNG specification, so
+ * consult that document for information about the meaning of each field.
+ *
+ * With libpng < 0.95, it was only possible to directly set and read the
+ * the values in the png_info_struct, which meant that the contents and
+ * order of the values had to remain fixed.  With libpng 0.95 and later,
+ * however, there are now functions that abstract the contents of
+ * png_info_struct from the application, so this makes it easier to use
+ * libpng with dynamic libraries, and even makes it possible to use
+ * libraries that don't have all of the libpng ancillary chunk-handing
+ * functionality.
+ *
+ * In any case, the order of the parameters in png_info_struct should NOT
+ * be changed for as long as possible to keep compatibility with applications
+ * that use the old direct-access method with png_info_struct.
+ *
+ * The following members may have allocated storage attached that should be
+ * cleaned up before the structure is discarded: palette, trans, text,
+ * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
+ * splt_palettes, scal_unit, row_pointers, and unknowns.   By default, these
+ * are automatically freed when the info structure is deallocated, if they were
+ * allocated internally by libpng.  This behavior can be changed by means
+ * of the png_data_freer() function.
+ *
+ * More allocation details: all the chunk-reading functions that
+ * change these members go through the corresponding png_set_*
+ * functions.  A function to clear these members is available: see
+ * png_free_data().  The png_set_* functions do not depend on being
+ * able to point info structure members to any of the storage they are
+ * passed (they make their own copies), EXCEPT that the png_set_text
+ * functions use the same storage passed to them in the text_ptr or
+ * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
+ * functions do not make their own copies.
+ */
+typedef struct png_info_struct
+{
+   /* The following are necessary for every PNG file */
+   png_uint_32 width PNG_DEPSTRUCT;       /* width of image in pixels (from IHDR) */
+   png_uint_32 height PNG_DEPSTRUCT;      /* height of image in pixels (from IHDR) */
+   png_uint_32 valid PNG_DEPSTRUCT;       /* valid chunk data (see PNG_INFO_ below) */
+   png_uint_32 rowbytes PNG_DEPSTRUCT;    /* bytes needed to hold an untransformed row */
+   png_colorp palette PNG_DEPSTRUCT;      /* array of color values (valid & PNG_INFO_PLTE) */
+   png_uint_16 num_palette PNG_DEPSTRUCT; /* number of color entries in "palette" (PLTE) */
+   png_uint_16 num_trans PNG_DEPSTRUCT;   /* number of transparent palette color (tRNS) */
+   png_byte bit_depth PNG_DEPSTRUCT;      /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */
+   png_byte color_type PNG_DEPSTRUCT;     /* see PNG_COLOR_TYPE_ below (from IHDR) */
+   /* The following three should have been named *_method not *_type */
+   png_byte compression_type PNG_DEPSTRUCT; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */
+   png_byte filter_type PNG_DEPSTRUCT;    /* must be PNG_FILTER_TYPE_BASE (from IHDR) */
+   png_byte interlace_type PNG_DEPSTRUCT; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
+
+   /* The following is informational only on read, and not used on writes. */
+   png_byte channels PNG_DEPSTRUCT;       /* number of data channels per pixel (1, 2, 3, 4) */
+   png_byte pixel_depth PNG_DEPSTRUCT;    /* number of bits per pixel */
+   png_byte spare_byte PNG_DEPSTRUCT;     /* to align the data, and for future use */
+   png_byte signature[8] PNG_DEPSTRUCT;   /* magic bytes read by libpng from start of file */
+
+   /* The rest of the data is optional.  If you are reading, check the
+    * valid field to see if the information in these are valid.  If you
+    * are writing, set the valid field to those chunks you want written,
+    * and initialize the appropriate fields below.
+    */
+
+#if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
+   /* The gAMA chunk describes the gamma characteristics of the system
+    * on which the image was created, normally in the range [1.0, 2.5].
+    * Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
+    */
+   float gamma PNG_DEPSTRUCT; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
+#endif
+
+#ifdef PNG_sRGB_SUPPORTED
+    /* GR-P, 0.96a */
+    /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */
+   png_byte srgb_intent PNG_DEPSTRUCT; /* sRGB rendering intent [0, 1, 2, or 3] */
+#endif
+
+#ifdef PNG_TEXT_SUPPORTED
+   /* The tEXt, and zTXt chunks contain human-readable textual data in
+    * uncompressed, compressed, and optionally compressed forms, respectively.
+    * The data in "text" is an array of pointers to uncompressed,
+    * null-terminated C strings. Each chunk has a keyword that describes the
+    * textual data contained in that chunk.  Keywords are not required to be
+    * unique, and the text string may be empty.  Any number of text chunks may
+    * be in an image.
+    */
+   int num_text PNG_DEPSTRUCT; /* number of comments read/to write */
+   int max_text PNG_DEPSTRUCT; /* current size of text array */
+   png_textp text PNG_DEPSTRUCT; /* array of comments read/to write */
+#endif /* PNG_TEXT_SUPPORTED */
+
+#ifdef PNG_tIME_SUPPORTED
+   /* The tIME chunk holds the last time the displayed image data was
+    * modified.  See the png_time struct for the contents of this struct.
+    */
+   png_time mod_time PNG_DEPSTRUCT;
+#endif
+
+#ifdef PNG_sBIT_SUPPORTED
+   /* The sBIT chunk specifies the number of significant high-order bits
+    * in the pixel data.  Values are in the range [1, bit_depth], and are
+    * only specified for the channels in the pixel data.  The contents of
+    * the low-order bits is not specified.  Data is valid if
+    * (valid & PNG_INFO_sBIT) is non-zero.
+    */
+   png_color_8 sig_bit PNG_DEPSTRUCT; /* significant bits in color channels */
+#endif
+
+#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \
+defined(PNG_READ_BACKGROUND_SUPPORTED)
+   /* The tRNS chunk supplies transparency data for paletted images and
+    * other image types that don't need a full alpha channel.  There are
+    * "num_trans" transparency values for a paletted image, stored in the
+    * same order as the palette colors, starting from index 0.  Values
+    * for the data are in the range [0, 255], ranging from fully transparent
+    * to fully opaque, respectively.  For non-paletted images, there is a
+    * single color specified that should be treated as fully transparent.
+    * Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
+    */
+   png_bytep trans PNG_DEPSTRUCT; /* transparent values for paletted image */
+   png_color_16 trans_values PNG_DEPSTRUCT; /* transparent color for non-palette image */
+#endif
+
+#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
+   /* The bKGD chunk gives the suggested image background color if the
+    * display program does not have its own background color and the image
+    * is needs to composited onto a background before display.  The colors
+    * in "background" are normally in the same color space/depth as the
+    * pixel data.  Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
+    */
+   png_color_16 background PNG_DEPSTRUCT;
+#endif
+
+#ifdef PNG_oFFs_SUPPORTED
+   /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards
+    * and downwards from the top-left corner of the display, page, or other
+    * application-specific co-ordinate space.  See the PNG_OFFSET_ defines
+    * below for the unit types.  Valid if (valid & PNG_INFO_oFFs) non-zero.
+    */
+   png_int_32 x_offset PNG_DEPSTRUCT; /* x offset on page */
+   png_int_32 y_offset PNG_DEPSTRUCT; /* y offset on page */
+   png_byte offset_unit_type PNG_DEPSTRUCT; /* offset units type */
+#endif
+
+#ifdef PNG_pHYs_SUPPORTED
+   /* The pHYs chunk gives the physical pixel density of the image for
+    * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
+    * defines below).  Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
+    */
+   png_uint_32 x_pixels_per_unit PNG_DEPSTRUCT; /* horizontal pixel density */
+   png_uint_32 y_pixels_per_unit PNG_DEPSTRUCT; /* vertical pixel density */
+   png_byte phys_unit_type PNG_DEPSTRUCT; /* resolution type (see PNG_RESOLUTION_ below) */
+#endif
+
+#ifdef PNG_hIST_SUPPORTED
+   /* The hIST chunk contains the relative frequency or importance of the
+    * various palette entries, so that a viewer can intelligently select a
+    * reduced-color palette, if required.  Data is an array of "num_palette"
+    * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)
+    * is non-zero.
+    */
+   png_uint_16p hist PNG_DEPSTRUCT;
+#endif
+
+#ifdef PNG_cHRM_SUPPORTED
+   /* The cHRM chunk describes the CIE color characteristics of the monitor
+    * on which the PNG was created.  This data allows the viewer to do gamut
+    * mapping of the input image to ensure that the viewer sees the same
+    * colors in the image as the creator.  Values are in the range
+    * [0.0, 0.8].  Data valid if (valid & PNG_INFO_cHRM) non-zero.
+    */
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+   float x_white PNG_DEPSTRUCT;
+   float y_white PNG_DEPSTRUCT;
+   float x_red PNG_DEPSTRUCT;
+   float y_red PNG_DEPSTRUCT;
+   float x_green PNG_DEPSTRUCT;
+   float y_green PNG_DEPSTRUCT;
+   float x_blue PNG_DEPSTRUCT;
+   float y_blue PNG_DEPSTRUCT;
+#endif
+#endif
+
+#ifdef PNG_pCAL_SUPPORTED
+   /* The pCAL chunk describes a transformation between the stored pixel
+    * values and original physical data values used to create the image.
+    * The integer range [0, 2^bit_depth - 1] maps to the floating-point
+    * range given by [pcal_X0, pcal_X1], and are further transformed by a
+    * (possibly non-linear) transformation function given by "pcal_type"
+    * and "pcal_params" into "pcal_units".  Please see the PNG_EQUATION_
+    * defines below, and the PNG-Group's PNG extensions document for a
+    * complete description of the transformations and how they should be
+    * implemented, and for a description of the ASCII parameter strings.
+    * Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
+    */
+   png_charp pcal_purpose PNG_DEPSTRUCT;  /* pCAL chunk description string */
+   png_int_32 pcal_X0 PNG_DEPSTRUCT;      /* minimum value */
+   png_int_32 pcal_X1 PNG_DEPSTRUCT;      /* maximum value */
+   png_charp pcal_units PNG_DEPSTRUCT;    /* Latin-1 string giving physical units */
+   png_charpp pcal_params PNG_DEPSTRUCT;  /* ASCII strings containing parameter values */
+   png_byte pcal_type PNG_DEPSTRUCT;      /* equation type (see PNG_EQUATION_ below) */
+   png_byte pcal_nparams PNG_DEPSTRUCT;   /* number of parameters given in pcal_params */
+#endif
+
+/* New members added in libpng-1.0.6 */
+#ifdef PNG_FREE_ME_SUPPORTED
+   png_uint_32 free_me PNG_DEPSTRUCT;     /* flags items libpng is responsible for freeing */
+#endif
+
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \
+ defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
+   /* Storage for unknown chunks that the library doesn't recognize. */
+   png_unknown_chunkp unknown_chunks PNG_DEPSTRUCT;
+   png_size_t unknown_chunks_num PNG_DEPSTRUCT;
+#endif
+
+#ifdef PNG_iCCP_SUPPORTED
+   /* iCCP chunk data. */
+   png_charp iccp_name PNG_DEPSTRUCT;     /* profile name */
+   png_charp iccp_profile PNG_DEPSTRUCT;  /* International Color Consortium profile data */
+                            /* Note to maintainer: should be png_bytep */
+   png_uint_32 iccp_proflen PNG_DEPSTRUCT;  /* ICC profile data length */
+   png_byte iccp_compression PNG_DEPSTRUCT; /* Always zero */
+#endif
+
+#ifdef PNG_sPLT_SUPPORTED
+   /* Data on sPLT chunks (there may be more than one). */
+   png_sPLT_tp splt_palettes PNG_DEPSTRUCT;
+   png_uint_32 splt_palettes_num PNG_DEPSTRUCT;
+#endif
+
+#ifdef PNG_sCAL_SUPPORTED
+   /* The sCAL chunk describes the actual physical dimensions of the
+    * subject matter of the graphic.  The chunk contains a unit specification
+    * a byte value, and two ASCII strings representing floating-point
+    * values.  The values are width and height corresponsing to one pixel
+    * in the image.  This external representation is converted to double
+    * here.  Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.
+    */
+   png_byte scal_unit PNG_DEPSTRUCT;         /* unit of physical scale */
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+   double scal_pixel_width PNG_DEPSTRUCT;    /* width of one pixel */
+   double scal_pixel_height PNG_DEPSTRUCT;   /* height of one pixel */
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+   png_charp scal_s_width PNG_DEPSTRUCT;     /* string containing height */
+   png_charp scal_s_height PNG_DEPSTRUCT;    /* string containing width */
+#endif
+#endif
+
+#ifdef PNG_INFO_IMAGE_SUPPORTED
+   /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */
+   /* Data valid if (valid & PNG_INFO_IDAT) non-zero */
+   png_bytepp row_pointers PNG_DEPSTRUCT;        /* the image bits */
+#endif
+
+#if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)
+   png_fixed_point int_gamma PNG_DEPSTRUCT; /* gamma of image, if (valid & PNG_INFO_gAMA) */
+#endif
+
+#if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED)
+   png_fixed_point int_x_white PNG_DEPSTRUCT;
+   png_fixed_point int_y_white PNG_DEPSTRUCT;
+   png_fixed_point int_x_red PNG_DEPSTRUCT;
+   png_fixed_point int_y_red PNG_DEPSTRUCT;
+   png_fixed_point int_x_green PNG_DEPSTRUCT;
+   png_fixed_point int_y_green PNG_DEPSTRUCT;
+   png_fixed_point int_x_blue PNG_DEPSTRUCT;
+   png_fixed_point int_y_blue PNG_DEPSTRUCT;
+#endif
+
+} png_info;
+
+typedef png_info FAR * png_infop;
+typedef png_info FAR * FAR * png_infopp;
+
+/* Maximum positive integer used in PNG is (2^31)-1 */
+#define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
+#define PNG_UINT_32_MAX ((png_uint_32)(-1))
+#define PNG_SIZE_MAX ((png_size_t)(-1))
+#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
+/* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */
+#define PNG_MAX_UINT PNG_UINT_31_MAX
+#endif
+
+/* These describe the color_type field in png_info. */
+/* color type masks */
+#define PNG_COLOR_MASK_PALETTE    1
+#define PNG_COLOR_MASK_COLOR      2
+#define PNG_COLOR_MASK_ALPHA      4
+
+/* color types.  Note that not all combinations are legal */
+#define PNG_COLOR_TYPE_GRAY 0
+#define PNG_COLOR_TYPE_PALETTE  (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
+#define PNG_COLOR_TYPE_RGB        (PNG_COLOR_MASK_COLOR)
+#define PNG_COLOR_TYPE_RGB_ALPHA  (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
+#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
+/* aliases */
+#define PNG_COLOR_TYPE_RGBA  PNG_COLOR_TYPE_RGB_ALPHA
+#define PNG_COLOR_TYPE_GA  PNG_COLOR_TYPE_GRAY_ALPHA
+
+/* This is for compression type. PNG 1.0-1.2 only define the single type. */
+#define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
+#define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
+
+/* This is for filter type. PNG 1.0-1.2 only define the single type. */
+#define PNG_FILTER_TYPE_BASE      0 /* Single row per-byte filtering */
+#define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
+#define PNG_FILTER_TYPE_DEFAULT   PNG_FILTER_TYPE_BASE
+
+/* These are for the interlacing type.  These values should NOT be changed. */
+#define PNG_INTERLACE_NONE        0 /* Non-interlaced image */
+#define PNG_INTERLACE_ADAM7       1 /* Adam7 interlacing */
+#define PNG_INTERLACE_LAST        2 /* Not a valid value */
+
+/* These are for the oFFs chunk.  These values should NOT be changed. */
+#define PNG_OFFSET_PIXEL          0 /* Offset in pixels */
+#define PNG_OFFSET_MICROMETER     1 /* Offset in micrometers (1/10^6 meter) */
+#define PNG_OFFSET_LAST           2 /* Not a valid value */
+
+/* These are for the pCAL chunk.  These values should NOT be changed. */
+#define PNG_EQUATION_LINEAR       0 /* Linear transformation */
+#define PNG_EQUATION_BASE_E       1 /* Exponential base e transform */
+#define PNG_EQUATION_ARBITRARY    2 /* Arbitrary base exponential transform */
+#define PNG_EQUATION_HYPERBOLIC   3 /* Hyperbolic sine transformation */
+#define PNG_EQUATION_LAST         4 /* Not a valid value */
+
+/* These are for the sCAL chunk.  These values should NOT be changed. */
+#define PNG_SCALE_UNKNOWN         0 /* unknown unit (image scale) */
+#define PNG_SCALE_METER           1 /* meters per pixel */
+#define PNG_SCALE_RADIAN          2 /* radians per pixel */
+#define PNG_SCALE_LAST            3 /* Not a valid value */
+
+/* These are for the pHYs chunk.  These values should NOT be changed. */
+#define PNG_RESOLUTION_UNKNOWN    0 /* pixels/unknown unit (aspect ratio) */
+#define PNG_RESOLUTION_METER      1 /* pixels/meter */
+#define PNG_RESOLUTION_LAST       2 /* Not a valid value */
+
+/* These are for the sRGB chunk.  These values should NOT be changed. */
+#define PNG_sRGB_INTENT_PERCEPTUAL 0
+#define PNG_sRGB_INTENT_RELATIVE   1
+#define PNG_sRGB_INTENT_SATURATION 2
+#define PNG_sRGB_INTENT_ABSOLUTE   3
+#define PNG_sRGB_INTENT_LAST       4 /* Not a valid value */
+
+/* This is for text chunks */
+#define PNG_KEYWORD_MAX_LENGTH     79
+
+/* Maximum number of entries in PLTE/sPLT/tRNS arrays */
+#define PNG_MAX_PALETTE_LENGTH    256
+
+/* These determine if an ancillary chunk's data has been successfully read
+ * from the PNG header, or if the application has filled in the corresponding
+ * data in the info_struct to be written into the output file.  The values
+ * of the PNG_INFO_<chunk> defines should NOT be changed.
+ */
+#define PNG_INFO_gAMA 0x0001
+#define PNG_INFO_sBIT 0x0002
+#define PNG_INFO_cHRM 0x0004
+#define PNG_INFO_PLTE 0x0008
+#define PNG_INFO_tRNS 0x0010
+#define PNG_INFO_bKGD 0x0020
+#define PNG_INFO_hIST 0x0040
+#define PNG_INFO_pHYs 0x0080
+#define PNG_INFO_oFFs 0x0100
+#define PNG_INFO_tIME 0x0200
+#define PNG_INFO_pCAL 0x0400
+#define PNG_INFO_sRGB 0x0800   /* GR-P, 0.96a */
+#define PNG_INFO_iCCP 0x1000   /* ESR, 1.0.6 */
+#define PNG_INFO_sPLT 0x2000   /* ESR, 1.0.6 */
+#define PNG_INFO_sCAL 0x4000   /* ESR, 1.0.6 */
+#define PNG_INFO_IDAT 0x8000L  /* ESR, 1.0.6 */
+
+/* This is used for the transformation routines, as some of them
+ * change these values for the row.  It also should enable using
+ * the routines for other purposes.
+ */
+typedef struct png_row_info_struct
+{
+   png_uint_32 width; /* width of row */
+   png_uint_32 rowbytes; /* number of bytes in row */
+   png_byte color_type; /* color type of row */
+   png_byte bit_depth; /* bit depth of row */
+   png_byte channels; /* number of channels (1, 2, 3, or 4) */
+   png_byte pixel_depth; /* bits per pixel (depth * channels) */
+} png_row_info;
+
+typedef png_row_info FAR * png_row_infop;
+typedef png_row_info FAR * FAR * png_row_infopp;
+
+/* These are the function types for the I/O functions and for the functions
+ * that allow the user to override the default I/O functions with his or her
+ * own.  The png_error_ptr type should match that of user-supplied warning
+ * and error functions, while the png_rw_ptr type should match that of the
+ * user read/write data functions.
+ */
+typedef struct png_struct_def png_struct;
+typedef png_struct FAR * png_structp;
+
+typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp));
+typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t));
+typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp));
+typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32,
+   int));
+typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32,
+   int));
+
+#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
+typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop));
+typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop));
+typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep,
+   png_uint_32, int));
+#endif
+
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
+    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
+    defined(PNG_LEGACY_SUPPORTED)
+typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp,
+    png_row_infop, png_bytep));
+#endif
+
+#ifdef PNG_USER_CHUNKS_SUPPORTED
+typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp));
+#endif
+#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
+typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));
+#endif
+
+/* Transform masks for the high-level interface */
+#define PNG_TRANSFORM_IDENTITY       0x0000    /* read and write */
+#define PNG_TRANSFORM_STRIP_16       0x0001    /* read only */
+#define PNG_TRANSFORM_STRIP_ALPHA    0x0002    /* read only */
+#define PNG_TRANSFORM_PACKING        0x0004    /* read and write */
+#define PNG_TRANSFORM_PACKSWAP       0x0008    /* read and write */
+#define PNG_TRANSFORM_EXPAND         0x0010    /* read only */
+#define PNG_TRANSFORM_INVERT_MONO    0x0020    /* read and write */
+#define PNG_TRANSFORM_SHIFT          0x0040    /* read and write */
+#define PNG_TRANSFORM_BGR            0x0080    /* read and write */
+#define PNG_TRANSFORM_SWAP_ALPHA     0x0100    /* read and write */
+#define PNG_TRANSFORM_SWAP_ENDIAN    0x0200    /* read and write */
+#define PNG_TRANSFORM_INVERT_ALPHA   0x0400    /* read and write */
+#define PNG_TRANSFORM_STRIP_FILLER   0x0800    /* write only, deprecated */
+/* Added to libpng-1.2.34 */
+#define PNG_TRANSFORM_STRIP_FILLER_BEFORE 0x0800  /* write only */
+#define PNG_TRANSFORM_STRIP_FILLER_AFTER  0x1000  /* write only */
+/* Added to libpng-1.2.41 */
+#define PNG_TRANSFORM_GRAY_TO_RGB   0x2000      /* read only */
+
+/* Flags for MNG supported features */
+#define PNG_FLAG_MNG_EMPTY_PLTE     0x01
+#define PNG_FLAG_MNG_FILTER_64      0x04
+#define PNG_ALL_MNG_FEATURES        0x05
+
+typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t));
+typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp));
+
+/* The structure that holds the information to read and write PNG files.
+ * The only people who need to care about what is inside of this are the
+ * people who will be modifying the library for their own special needs.
+ * It should NOT be accessed directly by an application, except to store
+ * the jmp_buf.
+ */
+
+struct png_struct_def
+{
+#ifdef PNG_SETJMP_SUPPORTED
+   jmp_buf jmpbuf;            /* used in png_error */
+#endif
+   png_error_ptr error_fn PNG_DEPSTRUCT;    /* function for printing errors and aborting */
+   png_error_ptr warning_fn PNG_DEPSTRUCT;  /* function for printing warnings */
+   png_voidp error_ptr PNG_DEPSTRUCT;       /* user supplied struct for error functions */
+   png_rw_ptr write_data_fn PNG_DEPSTRUCT;  /* function for writing output data */
+   png_rw_ptr read_data_fn PNG_DEPSTRUCT;   /* function for reading input data */
+   png_voidp io_ptr PNG_DEPSTRUCT;          /* ptr to application struct for I/O functions */
+
+#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
+   png_user_transform_ptr read_user_transform_fn PNG_DEPSTRUCT; /* user read transform */
+#endif
+
+#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
+   png_user_transform_ptr write_user_transform_fn PNG_DEPSTRUCT; /* user write transform */
+#endif
+
+/* These were added in libpng-1.0.2 */
+#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
+    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+   png_voidp user_transform_ptr PNG_DEPSTRUCT; /* user supplied struct for user transform */
+   png_byte user_transform_depth PNG_DEPSTRUCT;    /* bit depth of user transformed pixels */
+   png_byte user_transform_channels PNG_DEPSTRUCT; /* channels in user transformed pixels */
+#endif
+#endif
+
+   png_uint_32 mode PNG_DEPSTRUCT;          /* tells us where we are in the PNG file */
+   png_uint_32 flags PNG_DEPSTRUCT;         /* flags indicating various things to libpng */
+   png_uint_32 transformations PNG_DEPSTRUCT; /* which transformations to perform */
+
+   z_stream zstream PNG_DEPSTRUCT;          /* pointer to decompression structure (below) */
+   png_bytep zbuf PNG_DEPSTRUCT;            /* buffer for zlib */
+   png_size_t zbuf_size PNG_DEPSTRUCT;      /* size of zbuf */
+   int zlib_level PNG_DEPSTRUCT;            /* holds zlib compression level */
+   int zlib_method PNG_DEPSTRUCT;           /* holds zlib compression method */
+   int zlib_window_bits PNG_DEPSTRUCT;      /* holds zlib compression window bits */
+   int zlib_mem_level PNG_DEPSTRUCT;        /* holds zlib compression memory level */
+   int zlib_strategy PNG_DEPSTRUCT;         /* holds zlib compression strategy */
+
+   png_uint_32 width PNG_DEPSTRUCT;         /* width of image in pixels */
+   png_uint_32 height PNG_DEPSTRUCT;        /* height of image in pixels */
+   png_uint_32 num_rows PNG_DEPSTRUCT;      /* number of rows in current pass */
+   png_uint_32 usr_width PNG_DEPSTRUCT;     /* width of row at start of write */
+   png_uint_32 rowbytes PNG_DEPSTRUCT;      /* size of row in bytes */
+#if 0 /* Replaced with the following in libpng-1.2.43 */
+   png_size_t irowbytes PNG_DEPSTRUCT;
+#endif
+/* Added in libpng-1.2.43 */
+#ifdef PNG_USER_LIMITS_SUPPORTED
+   /* Added in libpng-1.4.0: Total number of sPLT, text, and unknown
+    * chunks that can be stored (0 means unlimited).
+    */
+   png_uint_32 user_chunk_cache_max PNG_DEPSTRUCT;
+#endif
+   png_uint_32 iwidth PNG_DEPSTRUCT;        /* width of current interlaced row in pixels */
+   png_uint_32 row_number PNG_DEPSTRUCT;    /* current row in interlace pass */
+   png_bytep prev_row PNG_DEPSTRUCT;        /* buffer to save previous (unfiltered) row */
+   png_bytep row_buf PNG_DEPSTRUCT;         /* buffer to save current (unfiltered) row */
+#ifndef PNG_NO_WRITE_FILTER
+   png_bytep sub_row PNG_DEPSTRUCT;         /* buffer to save "sub" row when filtering */
+   png_bytep up_row PNG_DEPSTRUCT;          /* buffer to save "up" row when filtering */
+   png_bytep avg_row PNG_DEPSTRUCT;         /* buffer to save "avg" row when filtering */
+   png_bytep paeth_row PNG_DEPSTRUCT;       /* buffer to save "Paeth" row when filtering */
+#endif
+   png_row_info row_info PNG_DEPSTRUCT;     /* used for transformation routines */
+
+   png_uint_32 idat_size PNG_DEPSTRUCT;     /* current IDAT size for read */
+   png_uint_32 crc PNG_DEPSTRUCT;           /* current chunk CRC value */
+   png_colorp palette PNG_DEPSTRUCT;        /* palette from the input file */
+   png_uint_16 num_palette PNG_DEPSTRUCT;   /* number of color entries in palette */
+   png_uint_16 num_trans PNG_DEPSTRUCT;     /* number of transparency values */
+   png_byte chunk_name[5] PNG_DEPSTRUCT;    /* null-terminated name of current chunk */
+   png_byte compression PNG_DEPSTRUCT;      /* file compression type (always 0) */
+   png_byte filter PNG_DEPSTRUCT;           /* file filter type (always 0) */
+   png_byte interlaced PNG_DEPSTRUCT;       /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
+   png_byte pass PNG_DEPSTRUCT;             /* current interlace pass (0 - 6) */
+   png_byte do_filter PNG_DEPSTRUCT;        /* row filter flags (see PNG_FILTER_ below ) */
+   png_byte color_type PNG_DEPSTRUCT;       /* color type of file */
+   png_byte bit_depth PNG_DEPSTRUCT;        /* bit depth of file */
+   png_byte usr_bit_depth PNG_DEPSTRUCT;    /* bit depth of users row */
+   png_byte pixel_depth PNG_DEPSTRUCT;      /* number of bits per pixel */
+   png_byte channels PNG_DEPSTRUCT;         /* number of channels in file */
+   png_byte usr_channels PNG_DEPSTRUCT;     /* channels at start of write */
+   png_byte sig_bytes PNG_DEPSTRUCT;        /* magic bytes read/written from start of file */
+
+#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
+#ifdef PNG_LEGACY_SUPPORTED
+   png_byte filler PNG_DEPSTRUCT;           /* filler byte for pixel expansion */
+#else
+   png_uint_16 filler PNG_DEPSTRUCT;           /* filler bytes for pixel expansion */
+#endif
+#endif
+
+#ifdef PNG_bKGD_SUPPORTED
+   png_byte background_gamma_type PNG_DEPSTRUCT;
+#  ifdef PNG_FLOATING_POINT_SUPPORTED
+   float background_gamma PNG_DEPSTRUCT;
+#  endif
+   png_color_16 background PNG_DEPSTRUCT;   /* background color in screen gamma space */
+#ifdef PNG_READ_GAMMA_SUPPORTED
+   png_color_16 background_1 PNG_DEPSTRUCT; /* background normalized to gamma 1.0 */
+#endif
+#endif /* PNG_bKGD_SUPPORTED */
+
+#ifdef PNG_WRITE_FLUSH_SUPPORTED
+   png_flush_ptr output_flush_fn PNG_DEPSTRUCT; /* Function for flushing output */
+   png_uint_32 flush_dist PNG_DEPSTRUCT;    /* how many rows apart to flush, 0 - no flush */
+   png_uint_32 flush_rows PNG_DEPSTRUCT;    /* number of rows written since last flush */
+#endif
+
+#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
+   int gamma_shift PNG_DEPSTRUCT;      /* number of "insignificant" bits 16-bit gamma */
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+   float gamma PNG_DEPSTRUCT;          /* file gamma value */
+   float screen_gamma PNG_DEPSTRUCT;   /* screen gamma value (display_exponent) */
+#endif
+#endif
+
+#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
+   png_bytep gamma_table PNG_DEPSTRUCT;     /* gamma table for 8-bit depth files */
+   png_bytep gamma_from_1 PNG_DEPSTRUCT;    /* converts from 1.0 to screen */
+   png_bytep gamma_to_1 PNG_DEPSTRUCT;      /* converts from file to 1.0 */
+   png_uint_16pp gamma_16_table PNG_DEPSTRUCT; /* gamma table for 16-bit depth files */
+   png_uint_16pp gamma_16_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to screen */
+   png_uint_16pp gamma_16_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */
+#endif
+
+#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
+   png_color_8 sig_bit PNG_DEPSTRUCT;       /* significant bits in each available channel */
+#endif
+
+#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
+   png_color_8 shift PNG_DEPSTRUCT;         /* shift for significant bit tranformation */
+#endif
+
+#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
+ || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
+   png_bytep trans PNG_DEPSTRUCT;           /* transparency values for paletted files */
+   png_color_16 trans_values PNG_DEPSTRUCT; /* transparency values for non-paletted files */
+#endif
+
+   png_read_status_ptr read_row_fn PNG_DEPSTRUCT;   /* called after each row is decoded */
+   png_write_status_ptr write_row_fn PNG_DEPSTRUCT; /* called after each row is encoded */
+#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
+   png_progressive_info_ptr info_fn PNG_DEPSTRUCT; /* called after header data fully read */
+   png_progressive_row_ptr row_fn PNG_DEPSTRUCT;   /* called after each prog. row is decoded */
+   png_progressive_end_ptr end_fn PNG_DEPSTRUCT;   /* called after image is complete */
+   png_bytep save_buffer_ptr PNG_DEPSTRUCT;        /* current location in save_buffer */
+   png_bytep save_buffer PNG_DEPSTRUCT;            /* buffer for previously read data */
+   png_bytep current_buffer_ptr PNG_DEPSTRUCT;     /* current location in current_buffer */
+   png_bytep current_buffer PNG_DEPSTRUCT;         /* buffer for recently used data */
+   png_uint_32 push_length PNG_DEPSTRUCT;          /* size of current input chunk */
+   png_uint_32 skip_length PNG_DEPSTRUCT;          /* bytes to skip in input data */
+   png_size_t save_buffer_size PNG_DEPSTRUCT;      /* amount of data now in save_buffer */
+   png_size_t save_buffer_max PNG_DEPSTRUCT;       /* total size of save_buffer */
+   png_size_t buffer_size PNG_DEPSTRUCT;           /* total amount of available input data */
+   png_size_t current_buffer_size PNG_DEPSTRUCT;   /* amount of data now in current_buffer */
+   int process_mode PNG_DEPSTRUCT;                 /* what push library is currently doing */
+   int cur_palette PNG_DEPSTRUCT;                  /* current push library palette index */
+
+#  ifdef PNG_TEXT_SUPPORTED
+     png_size_t current_text_size PNG_DEPSTRUCT;   /* current size of text input data */
+     png_size_t current_text_left PNG_DEPSTRUCT;   /* how much text left to read in input */
+     png_charp current_text PNG_DEPSTRUCT;         /* current text chunk buffer */
+     png_charp current_text_ptr PNG_DEPSTRUCT;     /* current location in current_text */
+#  endif /* PNG_TEXT_SUPPORTED */
+#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
+
+#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
+/* for the Borland special 64K segment handler */
+   png_bytepp offset_table_ptr PNG_DEPSTRUCT;
+   png_bytep offset_table PNG_DEPSTRUCT;
+   png_uint_16 offset_table_number PNG_DEPSTRUCT;
+   png_uint_16 offset_table_count PNG_DEPSTRUCT;
+   png_uint_16 offset_table_count_free PNG_DEPSTRUCT;
+#endif
+
+#ifdef PNG_READ_DITHER_SUPPORTED
+   png_bytep palette_lookup PNG_DEPSTRUCT;         /* lookup table for dithering */
+   png_bytep dither_index PNG_DEPSTRUCT;           /* index translation for palette files */
+#endif
+
+#if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED)
+   png_uint_16p hist PNG_DEPSTRUCT;                /* histogram */
+#endif
+
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
+   png_byte heuristic_method PNG_DEPSTRUCT;        /* heuristic for row filter selection */
+   png_byte num_prev_filters PNG_DEPSTRUCT;        /* number of weights for previous rows */
+   png_bytep prev_filters PNG_DEPSTRUCT;           /* filter type(s) of previous row(s) */
+   png_uint_16p filter_weights PNG_DEPSTRUCT;      /* weight(s) for previous line(s) */
+   png_uint_16p inv_filter_weights PNG_DEPSTRUCT;  /* 1/weight(s) for previous line(s) */
+   png_uint_16p filter_costs PNG_DEPSTRUCT;        /* relative filter calculation cost */
+   png_uint_16p inv_filter_costs PNG_DEPSTRUCT;    /* 1/relative filter calculation cost */
+#endif
+
+#ifdef PNG_TIME_RFC1123_SUPPORTED
+   png_charp time_buffer PNG_DEPSTRUCT;            /* String to hold RFC 1123 time text */
+#endif
+
+/* New members added in libpng-1.0.6 */
+
+#ifdef PNG_FREE_ME_SUPPORTED
+   png_uint_32 free_me PNG_DEPSTRUCT;   /* flags items libpng is responsible for freeing */
+#endif
+
+#ifdef PNG_USER_CHUNKS_SUPPORTED
+   png_voidp user_chunk_ptr PNG_DEPSTRUCT;
+   png_user_chunk_ptr read_user_chunk_fn PNG_DEPSTRUCT; /* user read chunk handler */
+#endif
+
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+   int num_chunk_list PNG_DEPSTRUCT;
+   png_bytep chunk_list PNG_DEPSTRUCT;
+#endif
+
+/* New members added in libpng-1.0.3 */
+#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
+   png_byte rgb_to_gray_status PNG_DEPSTRUCT;
+   /* These were changed from png_byte in libpng-1.0.6 */
+   png_uint_16 rgb_to_gray_red_coeff PNG_DEPSTRUCT;
+   png_uint_16 rgb_to_gray_green_coeff PNG_DEPSTRUCT;
+   png_uint_16 rgb_to_gray_blue_coeff PNG_DEPSTRUCT;
+#endif
+
+/* New member added in libpng-1.0.4 (renamed in 1.0.9) */
+#if defined(PNG_MNG_FEATURES_SUPPORTED) || \
+    defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
+    defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
+/* Changed from png_byte to png_uint_32 at version 1.2.0 */
+#ifdef PNG_1_0_X
+   png_byte mng_features_permitted PNG_DEPSTRUCT;
+#else
+   png_uint_32 mng_features_permitted PNG_DEPSTRUCT;
+#endif /* PNG_1_0_X */
+#endif
+
+/* New member added in libpng-1.0.7 */
+#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
+   png_fixed_point int_gamma PNG_DEPSTRUCT;
+#endif
+
+/* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
+#ifdef PNG_MNG_FEATURES_SUPPORTED
+   png_byte filter_type PNG_DEPSTRUCT;
+#endif
+
+#ifdef PNG_1_0_X
+/* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */
+   png_uint_32 row_buf_size PNG_DEPSTRUCT;
+#endif
+
+/* New members added in libpng-1.2.0 */
+#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
+#  ifndef PNG_1_0_X
+#    ifdef PNG_MMX_CODE_SUPPORTED
+   png_byte     mmx_bitdepth_threshold PNG_DEPSTRUCT;
+   png_uint_32  mmx_rowbytes_threshold PNG_DEPSTRUCT;
+#    endif
+   png_uint_32  asm_flags PNG_DEPSTRUCT;
+#  endif
+#endif
+
+/* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
+#ifdef PNG_USER_MEM_SUPPORTED
+   png_voidp mem_ptr PNG_DEPSTRUCT;            /* user supplied struct for mem functions */
+   png_malloc_ptr malloc_fn PNG_DEPSTRUCT;     /* function for allocating memory */
+   png_free_ptr free_fn PNG_DEPSTRUCT;         /* function for freeing memory */
+#endif
+
+/* New member added in libpng-1.0.13 and 1.2.0 */
+   png_bytep big_row_buf PNG_DEPSTRUCT;        /* buffer to save current (unfiltered) row */
+
+#ifdef PNG_READ_DITHER_SUPPORTED
+/* The following three members were added at version 1.0.14 and 1.2.4 */
+   png_bytep dither_sort PNG_DEPSTRUCT;        /* working sort array */
+   png_bytep index_to_palette PNG_DEPSTRUCT;   /* where the original index currently is */
+                                 /* in the palette */
+   png_bytep palette_to_index PNG_DEPSTRUCT;   /* which original index points to this */
+                                 /* palette color */
+#endif
+
+/* New members added in libpng-1.0.16 and 1.2.6 */
+   png_byte compression_type PNG_DEPSTRUCT;
+
+#ifdef PNG_USER_LIMITS_SUPPORTED
+   png_uint_32 user_width_max PNG_DEPSTRUCT;
+   png_uint_32 user_height_max PNG_DEPSTRUCT;
+#endif
+
+/* New member added in libpng-1.0.25 and 1.2.17 */
+#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
+   /* Storage for unknown chunk that the library doesn't recognize. */
+   png_unknown_chunk unknown_chunk PNG_DEPSTRUCT;
+#endif
+
+/* New members added in libpng-1.2.26 */
+  png_uint_32 old_big_row_buf_size PNG_DEPSTRUCT;
+  png_uint_32 old_prev_row_size PNG_DEPSTRUCT;
+
+/* New member added in libpng-1.2.30 */
+  png_charp chunkdata PNG_DEPSTRUCT;  /* buffer for reading chunk data */
+
+
+};
+
+
+/* This triggers a compiler error in png.c, if png.c and png.h
+ * do not agree upon the version number.
+ */
+typedef png_structp version_1_2_46;
+
+typedef png_struct FAR * FAR * png_structpp;
+
+/* Here are the function definitions most commonly used.  This is not
+ * the place to find out how to use libpng.  See libpng.txt for the
+ * full explanation, see example.c for the summary.  This just provides
+ * a simple one line description of the use of each function.
+ */
+
+/* Returns the version number of the library */
+extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void));
+
+/* Tell lib we have already handled the first <num_bytes> magic bytes.
+ * Handling more than 8 bytes from the beginning of the file is an error.
+ */
+extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr,
+   int num_bytes));
+
+/* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
+ * PNG file.  Returns zero if the supplied bytes match the 8-byte PNG
+ * signature, and non-zero otherwise.  Having num_to_check == 0 or
+ * start > 7 will always fail (ie return non-zero).
+ */
+extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start,
+   png_size_t num_to_check));
+
+/* Simple signature checking function.  This is the same as calling
+ * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
+ */
+extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num)) PNG_DEPRECATED;
+
+/* Allocate and initialize png_ptr struct for reading, and any other memory. */
+extern PNG_EXPORT(png_structp,png_create_read_struct)
+   PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
+   png_error_ptr error_fn, png_error_ptr warn_fn)) PNG_ALLOCATED;
+
+/* Allocate and initialize png_ptr struct for writing, and any other memory */
+extern PNG_EXPORT(png_structp,png_create_write_struct)
+   PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
+   png_error_ptr error_fn, png_error_ptr warn_fn)) PNG_ALLOCATED;
+
+#ifdef PNG_WRITE_SUPPORTED
+extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size)
+   PNGARG((png_structp png_ptr));
+#endif
+
+#ifdef PNG_WRITE_SUPPORTED
+extern PNG_EXPORT(void,png_set_compression_buffer_size)
+   PNGARG((png_structp png_ptr, png_uint_32 size));
+#endif
+
+/* Reset the compression stream */
+extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr));
+
+/* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
+#ifdef PNG_USER_MEM_SUPPORTED
+extern PNG_EXPORT(png_structp,png_create_read_struct_2)
+   PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
+   png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
+   png_malloc_ptr malloc_fn, png_free_ptr free_fn)) PNG_ALLOCATED;
+extern PNG_EXPORT(png_structp,png_create_write_struct_2)
+   PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
+   png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
+   png_malloc_ptr malloc_fn, png_free_ptr free_fn)) PNG_ALLOCATED;
+#endif
+
+/* Write a PNG chunk - size, type, (optional) data, CRC. */
+extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr,
+   png_bytep chunk_name, png_bytep data, png_size_t length));
+
+/* Write the start of a PNG chunk - length and chunk name. */
+extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr,
+   png_bytep chunk_name, png_uint_32 length));
+
+/* Write the data of a PNG chunk started with png_write_chunk_start(). */
+extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr,
+   png_bytep data, png_size_t length));
+
+/* Finish a chunk started with png_write_chunk_start() (includes CRC). */
+extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr));
+
+/* Allocate and initialize the info structure */
+extern PNG_EXPORT(png_infop,png_create_info_struct)
+   PNGARG((png_structp png_ptr)) PNG_ALLOCATED;
+
+#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
+/* Initialize the info structure (old interface - DEPRECATED) */
+extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr))
+    PNG_DEPRECATED;
+#undef png_info_init
+#define png_info_init(info_ptr) png_info_init_3(&info_ptr,\
+    png_sizeof(png_info));
+#endif
+
+extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr,
+    png_size_t png_info_struct_size));
+
+/* Writes all the PNG information before the image. */
+extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr,
+   png_infop info_ptr));
+extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,
+   png_infop info_ptr));
+
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
+/* Read the information before the actual image data. */
+extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr,
+   png_infop info_ptr));
+#endif
+
+#ifdef PNG_TIME_RFC1123_SUPPORTED
+extern PNG_EXPORT(png_charp,png_convert_to_rfc1123)
+   PNGARG((png_structp png_ptr, png_timep ptime));
+#endif
+
+#ifdef PNG_CONVERT_tIME_SUPPORTED
+/* Convert from a struct tm to png_time */
+extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime,
+   struct tm FAR * ttime));
+
+/* Convert from time_t to png_time.  Uses gmtime() */
+extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime,
+   time_t ttime));
+#endif /* PNG_CONVERT_tIME_SUPPORTED */
+
+#ifdef PNG_READ_EXPAND_SUPPORTED
+/* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
+extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr));
+#ifndef PNG_1_0_X
+extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp
+  png_ptr));
+#endif
+extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr));
+extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr));
+#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
+/* Deprecated */
+extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp
+    png_ptr)) PNG_DEPRECATED;
+#endif
+#endif
+
+#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
+/* Use blue, green, red order for pixels. */
+extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr));
+#endif
+
+#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
+/* Expand the grayscale to 24-bit RGB if necessary. */
+extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr));
+#endif
+
+#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
+/* Reduce RGB to grayscale. */
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr,
+   int error_action, double red, double green ));
+#endif
+extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr,
+   int error_action, png_fixed_point red, png_fixed_point green ));
+extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp
+   png_ptr));
+#endif
+
+extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth,
+   png_colorp palette));
+
+#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
+extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr));
+#endif
+
+#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
+    defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
+extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr));
+#endif
+
+#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
+    defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
+extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr));
+#endif
+
+#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
+/* Add a filler byte to 8-bit Gray or 24-bit RGB images. */
+extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr,
+   png_uint_32 filler, int flags));
+/* The values of the PNG_FILLER_ defines should NOT be changed */
+#define PNG_FILLER_BEFORE 0
+#define PNG_FILLER_AFTER 1
+/* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */
+#ifndef PNG_1_0_X
+extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr,
+   png_uint_32 filler, int flags));
+#endif
+#endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
+
+#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
+/* Swap bytes in 16-bit depth files. */
+extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr));
+#endif
+
+#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
+/* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
+extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr));
+#endif
+
+#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
+/* Swap packing order of pixels in bytes. */
+extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr));
+#endif
+
+#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
+/* Converts files to legal bit depths. */
+extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr,
+   png_color_8p true_bits));
+#endif
+
+#if defined(PNG_READ_INTERLACING_SUPPORTED) || \
+    defined(PNG_WRITE_INTERLACING_SUPPORTED)
+/* Have the code handle the interlacing.  Returns the number of passes. */
+extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr));
+#endif
+
+#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
+/* Invert monochrome files */
+extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr));
+#endif
+
+#ifdef PNG_READ_BACKGROUND_SUPPORTED
+/* Handle alpha and tRNS by replacing with a background color. */
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr,
+   png_color_16p background_color, int background_gamma_code,
+   int need_expand, double background_gamma));
+#endif
+#define PNG_BACKGROUND_GAMMA_UNKNOWN 0
+#define PNG_BACKGROUND_GAMMA_SCREEN  1
+#define PNG_BACKGROUND_GAMMA_FILE    2
+#define PNG_BACKGROUND_GAMMA_UNIQUE  3
+#endif
+
+#ifdef PNG_READ_16_TO_8_SUPPORTED
+/* Strip the second byte of information from a 16-bit depth file. */
+extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr));
+#endif
+
+#ifdef PNG_READ_DITHER_SUPPORTED
+/* Turn on dithering, and reduce the palette to the number of colors available. */
+extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr,
+   png_colorp palette, int num_palette, int maximum_colors,
+   png_uint_16p histogram, int full_dither));
+#endif
+
+#ifdef PNG_READ_GAMMA_SUPPORTED
+/* Handle gamma correction. Screen_gamma=(display_exponent) */
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr,
+   double screen_gamma, double default_file_gamma));
+#endif
+#endif
+
+#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
+#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
+    defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
+/* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */
+/* Deprecated and will be removed.  Use png_permit_mng_features() instead. */
+extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr,
+   int empty_plte_permitted)) PNG_DEPRECATED;
+#endif
+#endif
+
+#ifdef PNG_WRITE_FLUSH_SUPPORTED
+/* Set how many lines between output flushes - 0 for no flushing */
+extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows));
+/* Flush the current PNG output buffer */
+extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr));
+#endif
+
+/* Optional update palette with requested transformations */
+extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr));
+
+/* Optional call to update the users info structure */
+extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr,
+   png_infop info_ptr));
+
+#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
+/* Read one or more rows of image data. */
+extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr,
+   png_bytepp row, png_bytepp display_row, png_uint_32 num_rows));
+#endif
+
+#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
+/* Read a row of data. */
+extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr,
+   png_bytep row,
+   png_bytep display_row));
+#endif
+
+#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
+/* Read the whole image into memory at once. */
+extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr,
+   png_bytepp image));
+#endif
+
+/* Write a row of image data */
+extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr,
+   png_bytep row));
+
+/* Write a few rows of image data */
+extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr,
+   png_bytepp row, png_uint_32 num_rows));
+
+/* Write the image data */
+extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr,
+   png_bytepp image));
+
+/* Writes the end of the PNG file. */
+extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,
+   png_infop info_ptr));
+
+#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
+/* Read the end of the PNG file. */
+extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr,
+   png_infop info_ptr));
+#endif
+
+/* Free any memory associated with the png_info_struct */
+extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr,
+   png_infopp info_ptr_ptr));
+
+/* Free any memory associated with the png_struct and the png_info_structs */
+extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp
+   png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));
+
+/* Free all memory used by the read (old method - NOT DLL EXPORTED) */
+extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
+   png_infop end_info_ptr)) PNG_DEPRECATED;
+
+/* Free any memory associated with the png_struct and the png_info_structs */
+extern PNG_EXPORT(void,png_destroy_write_struct)
+   PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));
+
+/* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
+extern void png_write_destroy PNGARG((png_structp png_ptr)) PNG_DEPRECATED;
+
+/* Set the libpng method of handling chunk CRC errors */
+extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr,
+   int crit_action, int ancil_action));
+
+/* Values for png_set_crc_action() to say how to handle CRC errors in
+ * ancillary and critical chunks, and whether to use the data contained
+ * therein.  Note that it is impossible to "discard" data in a critical
+ * chunk.  For versions prior to 0.90, the action was always error/quit,
+ * whereas in version 0.90 and later, the action for CRC errors in ancillary
+ * chunks is warn/discard.  These values should NOT be changed.
+ *
+ *      value                       action:critical     action:ancillary
+ */
+#define PNG_CRC_DEFAULT       0  /* error/quit          warn/discard data */
+#define PNG_CRC_ERROR_QUIT    1  /* error/quit          error/quit        */
+#define PNG_CRC_WARN_DISCARD  2  /* (INVALID)           warn/discard data */
+#define PNG_CRC_WARN_USE      3  /* warn/use data       warn/use data     */
+#define PNG_CRC_QUIET_USE     4  /* quiet/use data      quiet/use data    */
+#define PNG_CRC_NO_CHANGE     5  /* use current value   use current value */
+
+/* These functions give the user control over the scan-line filtering in
+ * libpng and the compression methods used by zlib.  These functions are
+ * mainly useful for testing, as the defaults should work with most users.
+ * Those users who are tight on memory or want faster performance at the
+ * expense of compression can modify them.  See the compression library
+ * header file (zlib.h) for an explination of the compression functions.
+ */
+
+/* Set the filtering method(s) used by libpng.  Currently, the only valid
+ * value for "method" is 0.
+ */
+extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method,
+   int filters));
+
+/* Flags for png_set_filter() to say which filters to use.  The flags
+ * are chosen so that they don't conflict with real filter types
+ * below, in case they are supplied instead of the #defined constants.
+ * These values should NOT be changed.
+ */
+#define PNG_NO_FILTERS     0x00
+#define PNG_FILTER_NONE    0x08
+#define PNG_FILTER_SUB     0x10
+#define PNG_FILTER_UP      0x20
+#define PNG_FILTER_AVG     0x40
+#define PNG_FILTER_PAETH   0x80
+#define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \
+                         PNG_FILTER_AVG | PNG_FILTER_PAETH)
+
+/* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
+ * These defines should NOT be changed.
+ */
+#define PNG_FILTER_VALUE_NONE  0
+#define PNG_FILTER_VALUE_SUB   1
+#define PNG_FILTER_VALUE_UP    2
+#define PNG_FILTER_VALUE_AVG   3
+#define PNG_FILTER_VALUE_PAETH 4
+#define PNG_FILTER_VALUE_LAST  5
+
+#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */
+/* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_
+ * defines, either the default (minimum-sum-of-absolute-differences), or
+ * the experimental method (weighted-minimum-sum-of-absolute-differences).
+ *
+ * Weights are factors >= 1.0, indicating how important it is to keep the
+ * filter type consistent between rows.  Larger numbers mean the current
+ * filter is that many times as likely to be the same as the "num_weights"
+ * previous filters.  This is cumulative for each previous row with a weight.
+ * There needs to be "num_weights" values in "filter_weights", or it can be
+ * NULL if the weights aren't being specified.  Weights have no influence on
+ * the selection of the first row filter.  Well chosen weights can (in theory)
+ * improve the compression for a given image.
+ *
+ * Costs are factors >= 1.0 indicating the relative decoding costs of a
+ * filter type.  Higher costs indicate more decoding expense, and are
+ * therefore less likely to be selected over a filter with lower computational
+ * costs.  There needs to be a value in "filter_costs" for each valid filter
+ * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't
+ * setting the costs.  Costs try to improve the speed of decompression without
+ * unduly increasing the compressed image size.
+ *
+ * A negative weight or cost indicates the default value is to be used, and
+ * values in the range [0.0, 1.0) indicate the value is to remain unchanged.
+ * The default values for both weights and costs are currently 1.0, but may
+ * change if good general weighting/cost heuristics can be found.  If both
+ * the weights and costs are set to 1.0, this degenerates the WEIGHTED method
+ * to the UNWEIGHTED method, but with added encoding time/computation.
+ */
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr,
+   int heuristic_method, int num_weights, png_doublep filter_weights,
+   png_doublep filter_costs));
+#endif
+#endif /*  PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
+
+/* Heuristic used for row filter selection.  These defines should NOT be
+ * changed.
+ */
+#define PNG_FILTER_HEURISTIC_DEFAULT    0  /* Currently "UNWEIGHTED" */
+#define PNG_FILTER_HEURISTIC_UNWEIGHTED 1  /* Used by libpng < 0.95 */
+#define PNG_FILTER_HEURISTIC_WEIGHTED   2  /* Experimental feature */
+#define PNG_FILTER_HEURISTIC_LAST       3  /* Not a valid value */
+
+/* Set the library compression level.  Currently, valid values range from
+ * 0 - 9, corresponding directly to the zlib compression levels 0 - 9
+ * (0 - no compression, 9 - "maximal" compression).  Note that tests have
+ * shown that zlib compression levels 3-6 usually perform as well as level 9
+ * for PNG images, and do considerably fewer caclulations.  In the future,
+ * these values may not correspond directly to the zlib compression levels.
+ */
+extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr,
+   int level));
+
+extern PNG_EXPORT(void,png_set_compression_mem_level)
+   PNGARG((png_structp png_ptr, int mem_level));
+
+extern PNG_EXPORT(void,png_set_compression_strategy)
+   PNGARG((png_structp png_ptr, int strategy));
+
+extern PNG_EXPORT(void,png_set_compression_window_bits)
+   PNGARG((png_structp png_ptr, int window_bits));
+
+extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr,
+   int method));
+
+/* These next functions are called for input/output, memory, and error
+ * handling.  They are in the file pngrio.c, pngwio.c, and pngerror.c,
+ * and call standard C I/O routines such as fread(), fwrite(), and
+ * fprintf().  These functions can be made to use other I/O routines
+ * at run time for those applications that need to handle I/O in a
+ * different manner by calling png_set_???_fn().  See libpng.txt for
+ * more information.
+ */
+
+#ifdef PNG_STDIO_SUPPORTED
+/* Initialize the input/output for the PNG file to the default functions. */
+extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp));
+#endif
+
+/* Replace the (error and abort), and warning functions with user
+ * supplied functions.  If no messages are to be printed you must still
+ * write and use replacement functions. The replacement error_fn should
+ * still do a longjmp to the last setjmp location if you are using this
+ * method of error handling.  If error_fn or warning_fn is NULL, the
+ * default function will be used.
+ */
+
+extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr,
+   png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));
+
+/* Return the user pointer associated with the error functions */
+extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr));
+
+/* Replace the default data output functions with a user supplied one(s).
+ * If buffered output is not used, then output_flush_fn can be set to NULL.
+ * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
+ * output_flush_fn will be ignored (and thus can be NULL).
+ * It is probably a mistake to use NULL for output_flush_fn if
+ * write_data_fn is not also NULL unless you have built libpng with
+ * PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's
+ * default flush function, which uses the standard *FILE structure, will
+ * be used.
+ */
+extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr,
+   png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));
+
+/* Replace the default data input function with a user supplied one. */
+extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr,
+   png_voidp io_ptr, png_rw_ptr read_data_fn));
+
+/* Return the user pointer associated with the I/O functions */
+extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr));
+
+extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr,
+   png_read_status_ptr read_row_fn));
+
+extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr,
+   png_write_status_ptr write_row_fn));
+
+#ifdef PNG_USER_MEM_SUPPORTED
+/* Replace the default memory allocation functions with user supplied one(s). */
+extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr,
+   png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn));
+/* Return the user pointer associated with the memory functions */
+extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr));
+#endif
+
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
+    defined(PNG_LEGACY_SUPPORTED)
+extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp
+   png_ptr, png_user_transform_ptr read_user_transform_fn));
+#endif
+
+#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
+    defined(PNG_LEGACY_SUPPORTED)
+extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp
+   png_ptr, png_user_transform_ptr write_user_transform_fn));
+#endif
+
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
+    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
+    defined(PNG_LEGACY_SUPPORTED)
+extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp
+   png_ptr, png_voidp user_transform_ptr, int user_transform_depth,
+   int user_transform_channels));
+/* Return the user pointer associated with the user transform functions */
+extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr)
+   PNGARG((png_structp png_ptr));
+#endif
+
+#ifdef PNG_USER_CHUNKS_SUPPORTED
+extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr,
+   png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));
+extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp
+   png_ptr));
+#endif
+
+#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
+/* Sets the function callbacks for the push reader, and a pointer to a
+ * user-defined structure available to the callback functions.
+ */
+extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr,
+   png_voidp progressive_ptr,
+   png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
+   png_progressive_end_ptr end_fn));
+
+/* Returns the user pointer associated with the push read functions */
+extern PNG_EXPORT(png_voidp,png_get_progressive_ptr)
+   PNGARG((png_structp png_ptr));
+
+/* Function to be called when data becomes available */
+extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_bytep buffer, png_size_t buffer_size));
+
+/* Function that combines rows.  Not very much different than the
+ * png_combine_row() call.  Is this even used?????
+ */
+extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,
+   png_bytep old_row, png_bytep new_row));
+#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
+
+extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
+   png_uint_32 size)) PNG_ALLOCATED;
+
+#ifdef PNG_1_0_X
+#  define png_malloc_warn png_malloc
+#else
+/* Added at libpng version 1.2.4 */
+extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr,
+   png_uint_32 size)) PNG_ALLOCATED;
+#endif
+
+/* Frees a pointer allocated by png_malloc() */
+extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
+
+#ifdef PNG_1_0_X
+/* Function to allocate memory for zlib. */
+extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items,
+   uInt size));
+
+/* Function to free memory for zlib */
+extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr));
+#endif
+
+/* Free data that was allocated internally */
+extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_uint_32 free_me, int num));
+#ifdef PNG_FREE_ME_SUPPORTED
+/* Reassign responsibility for freeing existing data, whether allocated
+ * by libpng or by the application
+ */
+extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, int freer, png_uint_32 mask));
+#endif
+/* Assignments for png_data_freer */
+#define PNG_DESTROY_WILL_FREE_DATA 1
+#define PNG_SET_WILL_FREE_DATA 1
+#define PNG_USER_WILL_FREE_DATA 2
+/* Flags for png_ptr->free_me and info_ptr->free_me */
+#define PNG_FREE_HIST 0x0008
+#define PNG_FREE_ICCP 0x0010
+#define PNG_FREE_SPLT 0x0020
+#define PNG_FREE_ROWS 0x0040
+#define PNG_FREE_PCAL 0x0080
+#define PNG_FREE_SCAL 0x0100
+#define PNG_FREE_UNKN 0x0200
+#define PNG_FREE_LIST 0x0400
+#define PNG_FREE_PLTE 0x1000
+#define PNG_FREE_TRNS 0x2000
+#define PNG_FREE_TEXT 0x4000
+#define PNG_FREE_ALL  0x7fff
+#define PNG_FREE_MUL  0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
+
+#ifdef PNG_USER_MEM_SUPPORTED
+extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr,
+   png_uint_32 size)) PNG_ALLOCATED;
+extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr,
+   png_voidp ptr));
+#endif
+
+extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr,
+   png_voidp s1, png_voidp s2, png_uint_32 size)) PNG_DEPRECATED;
+
+extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr,
+   png_voidp s1, int value, png_uint_32 size)) PNG_DEPRECATED;
+
+#if defined(USE_FAR_KEYWORD)  /* memory model conversion function */
+extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,
+   int check));
+#endif /* USE_FAR_KEYWORD */
+
+#ifndef PNG_NO_ERROR_TEXT
+/* Fatal error in PNG image of libpng - can't continue */
+extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr,
+   png_const_charp error_message)) PNG_NORETURN;
+
+/* The same, but the chunk name is prepended to the error string. */
+extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr,
+   png_const_charp error_message)) PNG_NORETURN;
+#else
+/* Fatal error in PNG image of libpng - can't continue */
+extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr)) PNG_NORETURN;
+#endif
+
+#ifndef PNG_NO_WARNINGS
+/* Non-fatal error in libpng.  Can continue, but may have a problem. */
+extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr,
+   png_const_charp warning_message));
+
+#ifdef PNG_READ_SUPPORTED
+/* Non-fatal error in libpng, chunk name is prepended to message. */
+extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,
+   png_const_charp warning_message));
+#endif /* PNG_READ_SUPPORTED */
+#endif /* PNG_NO_WARNINGS */
+
+/* The png_set_<chunk> functions are for storing values in the png_info_struct.
+ * Similarly, the png_get_<chunk> calls are used to read values from the
+ * png_info_struct, either storing the parameters in the passed variables, or
+ * setting pointers into the png_info_struct where the data is stored.  The
+ * png_get_<chunk> functions return a non-zero value if the data was available
+ * in info_ptr, or return zero and do not change any of the parameters if the
+ * data was not available.
+ *
+ * These functions should be used instead of directly accessing png_info
+ * to avoid problems with future changes in the size and internal layout of
+ * png_info_struct.
+ */
+/* Returns "flag" if chunk data is valid in info_ptr. */
+extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr,
+png_infop info_ptr, png_uint_32 flag));
+
+/* Returns number of bytes needed to hold a transformed row. */
+extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr,
+png_infop info_ptr));
+
+#ifdef PNG_INFO_IMAGE_SUPPORTED
+/* Returns row_pointers, which is an array of pointers to scanlines that was
+ * returned from png_read_png().
+ */
+extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr,
+png_infop info_ptr));
+/* Set row_pointers, which is an array of pointers to scanlines for use
+ * by png_write_png().
+ */
+extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_bytepp row_pointers));
+#endif
+
+/* Returns number of color channels in image. */
+extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr,
+png_infop info_ptr));
+
+#ifdef PNG_EASY_ACCESS_SUPPORTED
+/* Returns image width in pixels. */
+extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp
+png_ptr, png_infop info_ptr));
+
+/* Returns image height in pixels. */
+extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp
+png_ptr, png_infop info_ptr));
+
+/* Returns image bit_depth. */
+extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp
+png_ptr, png_infop info_ptr));
+
+/* Returns image color_type. */
+extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp
+png_ptr, png_infop info_ptr));
+
+/* Returns image filter_type. */
+extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp
+png_ptr, png_infop info_ptr));
+
+/* Returns image interlace_type. */
+extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp
+png_ptr, png_infop info_ptr));
+
+/* Returns image compression_type. */
+extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp
+png_ptr, png_infop info_ptr));
+
+/* Returns image resolution in pixels per meter, from pHYs chunk data. */
+extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp
+png_ptr, png_infop info_ptr));
+extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp
+png_ptr, png_infop info_ptr));
+extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp
+png_ptr, png_infop info_ptr));
+
+/* Returns pixel aspect ratio, computed from pHYs chunk data.  */
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp
+png_ptr, png_infop info_ptr));
+#endif
+
+/* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
+extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp
+png_ptr, png_infop info_ptr));
+extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp
+png_ptr, png_infop info_ptr));
+extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp
+png_ptr, png_infop info_ptr));
+extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp
+png_ptr, png_infop info_ptr));
+
+#endif /* PNG_EASY_ACCESS_SUPPORTED */
+
+/* Returns pointer to signature string read from PNG header */
+extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr,
+png_infop info_ptr));
+
+#ifdef PNG_bKGD_SUPPORTED
+extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_color_16p *background));
+#endif
+
+#ifdef PNG_bKGD_SUPPORTED
+extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_color_16p background));
+#endif
+
+#ifdef PNG_cHRM_SUPPORTED
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, double *white_x, double *white_y, double *red_x,
+   double *red_y, double *green_x, double *green_y, double *blue_x,
+   double *blue_y));
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point
+   *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y,
+   png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point
+   *int_blue_x, png_fixed_point *int_blue_y));
+#endif
+#endif
+
+#ifdef PNG_cHRM_SUPPORTED
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, double white_x, double white_y, double red_x,
+   double red_y, double green_x, double green_y, double blue_x, double blue_y));
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y,
+   png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
+   int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
+   png_fixed_point int_blue_y));
+#endif
+#endif
+
+#ifdef PNG_gAMA_SUPPORTED
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, double *file_gamma));
+#endif
+extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_fixed_point *int_file_gamma));
+#endif
+
+#ifdef PNG_gAMA_SUPPORTED
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, double file_gamma));
+#endif
+extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_fixed_point int_file_gamma));
+#endif
+
+#ifdef PNG_hIST_SUPPORTED
+extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_uint_16p *hist));
+#endif
+
+#ifdef PNG_hIST_SUPPORTED
+extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_uint_16p hist));
+#endif
+
+extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_uint_32 *width, png_uint_32 *height,
+   int *bit_depth, int *color_type, int *interlace_method,
+   int *compression_method, int *filter_method));
+
+extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth,
+   int color_type, int interlace_method, int compression_method,
+   int filter_method));
+
+#ifdef PNG_oFFs_SUPPORTED
+extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y,
+   int *unit_type));
+#endif
+
+#ifdef PNG_oFFs_SUPPORTED
+extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y,
+   int unit_type));
+#endif
+
+#ifdef PNG_pCAL_SUPPORTED
+extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1,
+   int *type, int *nparams, png_charp *units, png_charpp *params));
+#endif
+
+#ifdef PNG_pCAL_SUPPORTED
+extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1,
+   int type, int nparams, png_charp units, png_charpp params));
+#endif
+
+#ifdef PNG_pHYs_SUPPORTED
+extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
+#endif
+
+#ifdef PNG_pHYs_SUPPORTED
+extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));
+#endif
+
+extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_colorp *palette, int *num_palette));
+
+extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_colorp palette, int num_palette));
+
+#ifdef PNG_sBIT_SUPPORTED
+extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_color_8p *sig_bit));
+#endif
+
+#ifdef PNG_sBIT_SUPPORTED
+extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_color_8p sig_bit));
+#endif
+
+#ifdef PNG_sRGB_SUPPORTED
+extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, int *intent));
+#endif
+
+#ifdef PNG_sRGB_SUPPORTED
+extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, int intent));
+extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, int intent));
+#endif
+
+#ifdef PNG_iCCP_SUPPORTED
+extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_charpp name, int *compression_type,
+   png_charpp profile, png_uint_32 *proflen));
+   /* Note to maintainer: profile should be png_bytepp */
+#endif
+
+#ifdef PNG_iCCP_SUPPORTED
+extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_charp name, int compression_type,
+   png_charp profile, png_uint_32 proflen));
+   /* Note to maintainer: profile should be png_bytep */
+#endif
+
+#ifdef PNG_sPLT_SUPPORTED
+extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_sPLT_tpp entries));
+#endif
+
+#ifdef PNG_sPLT_SUPPORTED
+extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_sPLT_tp entries, int nentries));
+#endif
+
+#ifdef PNG_TEXT_SUPPORTED
+/* png_get_text also returns the number of text chunks in *num_text */
+extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_textp *text_ptr, int *num_text));
+#endif
+
+/*
+ *  Note while png_set_text() will accept a structure whose text,
+ *  language, and  translated keywords are NULL pointers, the structure
+ *  returned by png_get_text will always contain regular
+ *  zero-terminated C strings.  They might be empty strings but
+ *  they will never be NULL pointers.
+ */
+
+#ifdef PNG_TEXT_SUPPORTED
+extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_textp text_ptr, int num_text));
+#endif
+
+#ifdef PNG_tIME_SUPPORTED
+extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_timep *mod_time));
+#endif
+
+#ifdef PNG_tIME_SUPPORTED
+extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_timep mod_time));
+#endif
+
+#ifdef PNG_tRNS_SUPPORTED
+extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_bytep *trans, int *num_trans,
+   png_color_16p *trans_values));
+#endif
+
+#ifdef PNG_tRNS_SUPPORTED
+extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_bytep trans, int num_trans,
+   png_color_16p trans_values));
+#endif
+
+#ifdef PNG_tRNS_SUPPORTED
+#endif
+
+#ifdef PNG_sCAL_SUPPORTED
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, int *unit, double *width, double *height));
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight));
+#endif
+#endif
+#endif /* PNG_sCAL_SUPPORTED */
+
+#ifdef PNG_sCAL_SUPPORTED
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, int unit, double width, double height));
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, int unit, png_charp swidth, png_charp sheight));
+#endif
+#endif
+#endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
+
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+/* Provide a list of chunks and how they are to be handled, if the built-in
+   handling or default unknown chunk handling is not desired.  Any chunks not
+   listed will be handled in the default manner.  The IHDR and IEND chunks
+   must not be listed.
+      keep = 0: follow default behaviour
+           = 1: do not keep
+           = 2: keep only if safe-to-copy
+           = 3: keep even if unsafe-to-copy
+*/
+extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp
+   png_ptr, int keep, png_bytep chunk_list, int num_chunks));
+PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep
+   chunk_name));
+#endif
+#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
+extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns));
+extern PNG_EXPORT(void, png_set_unknown_chunk_location)
+   PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location));
+extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp
+   png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));
+#endif
+
+/* Png_free_data() will turn off the "valid" flag for anything it frees.
+ * If you need to turn it off for a chunk that your application has freed,
+ * you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK);
+ */
+extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, int mask));
+
+#ifdef PNG_INFO_IMAGE_SUPPORTED
+/* The "params" pointer is currently not used and is for future expansion. */
+extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr,
+                        png_infop info_ptr,
+                        int transforms,
+                        png_voidp params));
+extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
+                        png_infop info_ptr,
+                        int transforms,
+                        png_voidp params));
+#endif
+
+/* Define PNG_DEBUG at compile time for debugging information.  Higher
+ * numbers for PNG_DEBUG mean more debugging information.  This has
+ * only been added since version 0.95 so it is not implemented throughout
+ * libpng yet, but more support will be added as needed.
+ */
+#ifdef PNG_DEBUG
+#if (PNG_DEBUG > 0)
+#if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
+#include <crtdbg.h>
+#if (PNG_DEBUG > 1)
+#ifndef _DEBUG
+#  define _DEBUG
+#endif
+#ifndef png_debug
+#define png_debug(l,m)  _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE)
+#endif
+#ifndef png_debug1
+#define png_debug1(l,m,p1)  _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1)
+#endif
+#ifndef png_debug2
+#define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2)
+#endif
+#endif
+#else /* PNG_DEBUG_FILE || !_MSC_VER */
+#ifndef PNG_DEBUG_FILE
+#define PNG_DEBUG_FILE stderr
+#endif /* PNG_DEBUG_FILE */
+
+#if (PNG_DEBUG > 1)
+/* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on non-ISO
+ * compilers.
+ */
+#  ifdef __STDC__
+#    ifndef png_debug
+#      define png_debug(l,m) \
+       { \
+       int num_tabs=l; \
+       fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
+         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
+       }
+#    endif
+#    ifndef png_debug1
+#      define png_debug1(l,m,p1) \
+       { \
+       int num_tabs=l; \
+       fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
+         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
+       }
+#    endif
+#    ifndef png_debug2
+#      define png_debug2(l,m,p1,p2) \
+       { \
+       int num_tabs=l; \
+       fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
+         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
+       }
+#    endif
+#  else /* __STDC __ */
+#    ifndef png_debug
+#      define png_debug(l,m) \
+       { \
+       int num_tabs=l; \
+       char format[256]; \
+       snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
+         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
+         m,PNG_STRING_NEWLINE); \
+       fprintf(PNG_DEBUG_FILE,format); \
+       }
+#    endif
+#    ifndef png_debug1
+#      define png_debug1(l,m,p1) \
+       { \
+       int num_tabs=l; \
+       char format[256]; \
+       snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
+         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
+         m,PNG_STRING_NEWLINE); \
+       fprintf(PNG_DEBUG_FILE,format,p1); \
+       }
+#    endif
+#    ifndef png_debug2
+#      define png_debug2(l,m,p1,p2) \
+       { \
+       int num_tabs=l; \
+       char format[256]; \
+       snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
+         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
+         m,PNG_STRING_NEWLINE); \
+       fprintf(PNG_DEBUG_FILE,format,p1,p2); \
+       }
+#    endif
+#  endif /* __STDC __ */
+#endif /* (PNG_DEBUG > 1) */
+
+#endif /* _MSC_VER */
+#endif /* (PNG_DEBUG > 0) */
+#endif /* PNG_DEBUG */
+#ifndef png_debug
+#define png_debug(l, m)
+#endif
+#ifndef png_debug1
+#define png_debug1(l, m, p1)
+#endif
+#ifndef png_debug2
+#define png_debug2(l, m, p1, p2)
+#endif
+
+extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr));
+extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr));
+extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr));
+extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));
+
+#ifdef PNG_MNG_FEATURES_SUPPORTED
+extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
+   png_ptr, png_uint_32 mng_features_permitted));
+#endif
+
+/* For use in png_set_keep_unknown, added to version 1.2.6 */
+#define PNG_HANDLE_CHUNK_AS_DEFAULT   0
+#define PNG_HANDLE_CHUNK_NEVER        1
+#define PNG_HANDLE_CHUNK_IF_SAFE      2
+#define PNG_HANDLE_CHUNK_ALWAYS       3
+
+/* Added to version 1.2.0 */
+#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
+#ifdef PNG_MMX_CODE_SUPPORTED
+#define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED  0x01  /* not user-settable */
+#define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU    0x02  /* not user-settable */
+#define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  0x04
+#define PNG_ASM_FLAG_MMX_READ_INTERLACE    0x08
+#define PNG_ASM_FLAG_MMX_READ_FILTER_SUB   0x10
+#define PNG_ASM_FLAG_MMX_READ_FILTER_UP    0x20
+#define PNG_ASM_FLAG_MMX_READ_FILTER_AVG   0x40
+#define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80
+#define PNG_ASM_FLAGS_INITIALIZED          0x80000000  /* not user-settable */
+
+#define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  \
+                           | PNG_ASM_FLAG_MMX_READ_INTERLACE    \
+                           | PNG_ASM_FLAG_MMX_READ_FILTER_SUB   \
+                           | PNG_ASM_FLAG_MMX_READ_FILTER_UP    \
+                           | PNG_ASM_FLAG_MMX_READ_FILTER_AVG   \
+                           | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH )
+#define PNG_MMX_WRITE_FLAGS ( 0 )
+
+#define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \
+                      | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU   \
+                      | PNG_MMX_READ_FLAGS                \
+                      | PNG_MMX_WRITE_FLAGS )
+
+#define PNG_SELECT_READ   1
+#define PNG_SELECT_WRITE  2
+#endif /* PNG_MMX_CODE_SUPPORTED */
+
+#ifndef PNG_1_0_X
+/* pngget.c */
+extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask)
+   PNGARG((int flag_select, int *compilerID));
+
+/* pngget.c */
+extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask)
+   PNGARG((int flag_select));
+
+/* pngget.c */
+extern PNG_EXPORT(png_uint_32,png_get_asm_flags)
+   PNGARG((png_structp png_ptr));
+
+/* pngget.c */
+extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold)
+   PNGARG((png_structp png_ptr));
+
+/* pngget.c */
+extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold)
+   PNGARG((png_structp png_ptr));
+
+/* pngset.c */
+extern PNG_EXPORT(void,png_set_asm_flags)
+   PNGARG((png_structp png_ptr, png_uint_32 asm_flags));
+
+/* pngset.c */
+extern PNG_EXPORT(void,png_set_mmx_thresholds)
+   PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold,
+   png_uint_32 mmx_rowbytes_threshold));
+
+#endif /* PNG_1_0_X */
+
+#ifndef PNG_1_0_X
+/* png.c, pnggccrd.c, or pngvcrd.c */
+extern PNG_EXPORT(int,png_mmx_support) PNGARG((void));
+#endif /* PNG_1_0_X */
+#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
+
+/* Strip the prepended error numbers ("#nnn ") from error and warning
+ * messages before passing them to the error or warning handler.
+ */
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp
+   png_ptr, png_uint_32 strip_mode));
+#endif
+
+/* Added at libpng-1.2.6 */
+#ifdef PNG_SET_USER_LIMITS_SUPPORTED
+extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp
+   png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max));
+extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp
+   png_ptr));
+extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
+   png_ptr));
+#endif
+/* Maintainer: Put new public prototypes here ^, in libpng.3, and in
+ * project defs
+ */
+
+#ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
+/* With these routines we avoid an integer divide, which will be slower on
+ * most machines.  However, it does take more operations than the corresponding
+ * divide method, so it may be slower on a few RISC systems.  There are two
+ * shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
+ *
+ * Note that the rounding factors are NOT supposed to be the same!  128 and
+ * 32768 are correct for the NODIV code; 127 and 32767 are correct for the
+ * standard method.
+ *
+ * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
+ */
+
+ /* fg and bg should be in `gamma 1.0' space; alpha is the opacity          */
+
+#  define png_composite(composite, fg, alpha, bg)                            \
+     { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \
+                        +        (png_uint_16)(bg)*(png_uint_16)(255 -       \
+                        (png_uint_16)(alpha)) + (png_uint_16)128);           \
+       (composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
+
+#  define png_composite_16(composite, fg, alpha, bg)                         \
+     { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \
+                        + (png_uint_32)(bg)*(png_uint_32)(65535L -           \
+                        (png_uint_32)(alpha)) + (png_uint_32)32768L);        \
+       (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
+
+#else  /* Standard method using integer division */
+
+#  define png_composite(composite, fg, alpha, bg)                            \
+     (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) +    \
+       (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) +       \
+       (png_uint_16)127) / 255)
+
+#  define png_composite_16(composite, fg, alpha, bg)                         \
+     (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
+       (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) +      \
+       (png_uint_32)32767) / (png_uint_32)65535L)
+
+#endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
+
+/* Inline macros to do direct reads of bytes from the input buffer.  These
+ * require that you are using an architecture that uses PNG byte ordering
+ * (MSB first) and supports unaligned data storage.  I think that PowerPC
+ * in big-endian mode and 680x0 are the only ones that will support this.
+ * The x86 line of processors definitely do not.  The png_get_int_32()
+ * routine also assumes we are using two's complement format for negative
+ * values, which is almost certainly true.
+ */
+#ifdef PNG_READ_BIG_ENDIAN_SUPPORTED
+#  define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))
+#  define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))
+#  define png_get_int_32(buf)  ( *((png_int_32p)  (buf)))
+#else
+extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf));
+extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf));
+extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf));
+#endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */
+extern PNG_EXPORT(png_uint_32,png_get_uint_31)
+  PNGARG((png_structp png_ptr, png_bytep buf));
+/* No png_get_int_16 -- may be added if there's a real need for it. */
+
+/* Place a 32-bit number into a buffer in PNG byte order (big-endian).
+ */
+extern PNG_EXPORT(void,png_save_uint_32)
+   PNGARG((png_bytep buf, png_uint_32 i));
+extern PNG_EXPORT(void,png_save_int_32)
+   PNGARG((png_bytep buf, png_int_32 i));
+
+/* Place a 16-bit number into a buffer in PNG byte order.
+ * The parameter is declared unsigned int, not png_uint_16,
+ * just to avoid potential problems on pre-ANSI C compilers.
+ */
+extern PNG_EXPORT(void,png_save_uint_16)
+   PNGARG((png_bytep buf, unsigned int i));
+/* No png_save_int_16 -- may be added if there's a real need for it. */
+
+/* ************************************************************************* */
+
+/* These next functions are used internally in the code.  They generally
+ * shouldn't be used unless you are writing code to add or replace some
+ * functionality in libpng.  More information about most functions can
+ * be found in the files where the functions are located.
+ */
+
+
+/* Various modes of operation, that are visible to applications because
+ * they are used for unknown chunk location.
+ */
+#define PNG_HAVE_IHDR               0x01
+#define PNG_HAVE_PLTE               0x02
+#define PNG_HAVE_IDAT               0x04
+#define PNG_AFTER_IDAT              0x08 /* Have complete zlib datastream */
+#define PNG_HAVE_IEND               0x10
+
+#ifdef PNG_INTERNAL
+
+/* More modes of operation.  Note that after an init, mode is set to
+ * zero automatically when the structure is created.
+ */
+#define PNG_HAVE_gAMA               0x20
+#define PNG_HAVE_cHRM               0x40
+#define PNG_HAVE_sRGB               0x80
+#define PNG_HAVE_CHUNK_HEADER      0x100
+#define PNG_WROTE_tIME             0x200
+#define PNG_WROTE_INFO_BEFORE_PLTE 0x400
+#define PNG_BACKGROUND_IS_GRAY     0x800
+#define PNG_HAVE_PNG_SIGNATURE    0x1000
+#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
+
+/* Flags for the transformations the PNG library does on the image data */
+#define PNG_BGR                0x0001
+#define PNG_INTERLACE          0x0002
+#define PNG_PACK               0x0004
+#define PNG_SHIFT              0x0008
+#define PNG_SWAP_BYTES         0x0010
+#define PNG_INVERT_MONO        0x0020
+#define PNG_DITHER             0x0040
+#define PNG_BACKGROUND         0x0080
+#define PNG_BACKGROUND_EXPAND  0x0100
+                          /*   0x0200 unused */
+#define PNG_16_TO_8            0x0400
+#define PNG_RGBA               0x0800
+#define PNG_EXPAND             0x1000
+#define PNG_GAMMA              0x2000
+#define PNG_GRAY_TO_RGB        0x4000
+#define PNG_FILLER             0x8000L
+#define PNG_PACKSWAP          0x10000L
+#define PNG_SWAP_ALPHA        0x20000L
+#define PNG_STRIP_ALPHA       0x40000L
+#define PNG_INVERT_ALPHA      0x80000L
+#define PNG_USER_TRANSFORM   0x100000L
+#define PNG_RGB_TO_GRAY_ERR  0x200000L
+#define PNG_RGB_TO_GRAY_WARN 0x400000L
+#define PNG_RGB_TO_GRAY      0x600000L  /* two bits, RGB_TO_GRAY_ERR|WARN */
+                       /*    0x800000L     Unused */
+#define PNG_ADD_ALPHA       0x1000000L  /* Added to libpng-1.2.7 */
+#define PNG_EXPAND_tRNS     0x2000000L  /* Added to libpng-1.2.9 */
+#define PNG_PREMULTIPLY_ALPHA 0x4000000L  /* Added to libpng-1.2.41 */
+                                          /* by volker */
+                       /*   0x8000000L  unused */
+                       /*  0x10000000L  unused */
+                       /*  0x20000000L  unused */
+                       /*  0x40000000L  unused */
+
+/* Flags for png_create_struct */
+#define PNG_STRUCT_PNG   0x0001
+#define PNG_STRUCT_INFO  0x0002
+
+/* Scaling factor for filter heuristic weighting calculations */
+#define PNG_WEIGHT_SHIFT 8
+#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
+#define PNG_COST_SHIFT 3
+#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
+
+/* Flags for the png_ptr->flags rather than declaring a byte for each one */
+#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY     0x0001
+#define PNG_FLAG_ZLIB_CUSTOM_LEVEL        0x0002
+#define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL    0x0004
+#define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS  0x0008
+#define PNG_FLAG_ZLIB_CUSTOM_METHOD       0x0010
+#define PNG_FLAG_ZLIB_FINISHED            0x0020
+#define PNG_FLAG_ROW_INIT                 0x0040
+#define PNG_FLAG_FILLER_AFTER             0x0080
+#define PNG_FLAG_CRC_ANCILLARY_USE        0x0100
+#define PNG_FLAG_CRC_ANCILLARY_NOWARN     0x0200
+#define PNG_FLAG_CRC_CRITICAL_USE         0x0400
+#define PNG_FLAG_CRC_CRITICAL_IGNORE      0x0800
+#define PNG_FLAG_FREE_PLTE                0x1000
+#define PNG_FLAG_FREE_TRNS                0x2000
+#define PNG_FLAG_FREE_HIST                0x4000
+#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS      0x8000L
+#define PNG_FLAG_KEEP_UNSAFE_CHUNKS       0x10000L
+#define PNG_FLAG_LIBRARY_MISMATCH         0x20000L
+#define PNG_FLAG_STRIP_ERROR_NUMBERS      0x40000L
+#define PNG_FLAG_STRIP_ERROR_TEXT         0x80000L
+#define PNG_FLAG_MALLOC_NULL_MEM_OK       0x100000L
+#define PNG_FLAG_ADD_ALPHA                0x200000L  /* Added to libpng-1.2.8 */
+#define PNG_FLAG_STRIP_ALPHA              0x400000L  /* Added to libpng-1.2.8 */
+                                  /*      0x800000L  unused */
+                                  /*     0x1000000L  unused */
+                                  /*     0x2000000L  unused */
+                                  /*     0x4000000L  unused */
+                                  /*     0x8000000L  unused */
+                                  /*    0x10000000L  unused */
+                                  /*    0x20000000L  unused */
+                                  /*    0x40000000L  unused */
+
+#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
+                                     PNG_FLAG_CRC_ANCILLARY_NOWARN)
+
+#define PNG_FLAG_CRC_CRITICAL_MASK  (PNG_FLAG_CRC_CRITICAL_USE | \
+                                     PNG_FLAG_CRC_CRITICAL_IGNORE)
+
+#define PNG_FLAG_CRC_MASK           (PNG_FLAG_CRC_ANCILLARY_MASK | \
+                                     PNG_FLAG_CRC_CRITICAL_MASK)
+
+/* Save typing and make code easier to understand */
+
+#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
+   abs((int)((c1).green) - (int)((c2).green)) + \
+   abs((int)((c1).blue) - (int)((c2).blue)))
+
+/* Added to libpng-1.2.6 JB */
+#define PNG_ROWBYTES(pixel_bits, width) \
+    ((pixel_bits) >= 8 ? \
+    ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \
+    (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) )
+
+/* PNG_OUT_OF_RANGE returns true if value is outside the range
+ * ideal-delta..ideal+delta.  Each argument is evaluated twice.
+ * "ideal" and "delta" should be constants, normally simple
+ * integers, "value" a variable. Added to libpng-1.2.6 JB
+ */
+#define PNG_OUT_OF_RANGE(value, ideal, delta) \
+        ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
+
+/* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */
+#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
+/* Place to hold the signature string for a PNG file. */
+#ifdef PNG_USE_GLOBAL_ARRAYS
+   PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8];
+#else
+#endif
+#endif /* PNG_NO_EXTERN */
+
+/* Constant strings for known chunk types.  If you need to add a chunk,
+ * define the name here, and add an invocation of the macro in png.c and
+ * wherever it's needed.
+ */
+#define PNG_IHDR png_byte png_IHDR[5] = { 73,  72,  68,  82, '\0'}
+#define PNG_IDAT png_byte png_IDAT[5] = { 73,  68,  65,  84, '\0'}
+#define PNG_IEND png_byte png_IEND[5] = { 73,  69,  78,  68, '\0'}
+#define PNG_PLTE png_byte png_PLTE[5] = { 80,  76,  84,  69, '\0'}
+#define PNG_bKGD png_byte png_bKGD[5] = { 98,  75,  71,  68, '\0'}
+#define PNG_cHRM png_byte png_cHRM[5] = { 99,  72,  82,  77, '\0'}
+#define PNG_gAMA png_byte png_gAMA[5] = {103,  65,  77,  65, '\0'}
+#define PNG_hIST png_byte png_hIST[5] = {104,  73,  83,  84, '\0'}
+#define PNG_iCCP png_byte png_iCCP[5] = {105,  67,  67,  80, '\0'}
+#define PNG_iTXt png_byte png_iTXt[5] = {105,  84,  88, 116, '\0'}
+#define PNG_oFFs png_byte png_oFFs[5] = {111,  70,  70, 115, '\0'}
+#define PNG_pCAL png_byte png_pCAL[5] = {112,  67,  65,  76, '\0'}
+#define PNG_sCAL png_byte png_sCAL[5] = {115,  67,  65,  76, '\0'}
+#define PNG_pHYs png_byte png_pHYs[5] = {112,  72,  89, 115, '\0'}
+#define PNG_sBIT png_byte png_sBIT[5] = {115,  66,  73,  84, '\0'}
+#define PNG_sPLT png_byte png_sPLT[5] = {115,  80,  76,  84, '\0'}
+#define PNG_sRGB png_byte png_sRGB[5] = {115,  82,  71,  66, '\0'}
+#define PNG_tEXt png_byte png_tEXt[5] = {116,  69,  88, 116, '\0'}
+#define PNG_tIME png_byte png_tIME[5] = {116,  73,  77,  69, '\0'}
+#define PNG_tRNS png_byte png_tRNS[5] = {116,  82,  78,  83, '\0'}
+#define PNG_zTXt png_byte png_zTXt[5] = {122,  84,  88, 116, '\0'}
+
+#ifdef PNG_USE_GLOBAL_ARRAYS
+PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5];
+#endif /* PNG_USE_GLOBAL_ARRAYS */
+
+#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
+/* Initialize png_ptr struct for reading, and allocate any other memory.
+ * (old interface - DEPRECATED - use png_create_read_struct instead).
+ */
+extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr))
+    PNG_DEPRECATED;
+#undef png_read_init
+#define png_read_init(png_ptr) png_read_init_3(&png_ptr, \
+    PNG_LIBPNG_VER_STRING,  png_sizeof(png_struct));
+#endif
+
+extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr,
+    png_const_charp user_png_ver, png_size_t png_struct_size));
+#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
+extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr,
+    png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
+    png_info_size));
+#endif
+
+#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
+/* Initialize png_ptr struct for writing, and allocate any other memory.
+ * (old interface - DEPRECATED - use png_create_write_struct instead).
+ */
+extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr))
+    PNG_DEPRECATED;
+#undef png_write_init
+#define png_write_init(png_ptr) png_write_init_3(&png_ptr, \
+    PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
+#endif
+
+extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr,
+    png_const_charp user_png_ver, png_size_t png_struct_size));
+extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr,
+    png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
+    png_info_size));
+
+/* Allocate memory for an internal libpng struct */
+PNG_EXTERN png_voidp png_create_struct PNGARG((int type)) PNG_PRIVATE;
+
+/* Free memory from internal libpng struct */
+PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr)) PNG_PRIVATE;
+
+PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr
+  malloc_fn, png_voidp mem_ptr)) PNG_PRIVATE;
+PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
+   png_free_ptr free_fn, png_voidp mem_ptr)) PNG_PRIVATE;
+
+/* Free any memory that info_ptr points to and reset struct. */
+PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
+   png_infop info_ptr)) PNG_PRIVATE;
+
+#ifndef PNG_1_0_X
+/* Function to allocate memory for zlib. */
+PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items,
+   uInt size)) PNG_PRIVATE;
+
+/* Function to free memory for zlib */
+PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr)) PNG_PRIVATE;
+
+#ifdef PNG_SIZE_T
+/* Function to convert a sizeof an item to png_sizeof item */
+   PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size))
+      PNG_PRIVATE;
+#endif
+
+/* Next four functions are used internally as callbacks.  PNGAPI is required
+ * but not PNG_EXPORT.  PNGAPI added at libpng version 1.2.3.
+ */
+
+PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,
+   png_bytep data, png_size_t length)) PNG_PRIVATE;
+
+#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
+PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
+   png_bytep buffer, png_size_t length)) PNG_PRIVATE;
+#endif
+
+PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr,
+   png_bytep data, png_size_t length)) PNG_PRIVATE;
+
+#ifdef PNG_WRITE_FLUSH_SUPPORTED
+#ifdef PNG_STDIO_SUPPORTED
+PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr))
+   PNG_PRIVATE;
+#endif
+#endif
+#else /* PNG_1_0_X */
+#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
+PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr,
+   png_bytep buffer, png_size_t length)) PNG_PRIVATE;
+#endif
+#endif /* PNG_1_0_X */
+
+/* Reset the CRC variable */
+PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr)) PNG_PRIVATE;
+
+/* Write the "data" buffer to whatever output you are using. */
+PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data,
+   png_size_t length)) PNG_PRIVATE;
+
+/* Read data from whatever input you are using into the "data" buffer */
+PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
+   png_size_t length)) PNG_PRIVATE;
+
+/* Read bytes into buf, and update png_ptr->crc */
+PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
+   png_size_t length)) PNG_PRIVATE;
+
+/* Decompress data in a chunk that uses compression */
+#if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
+    defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
+PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr,
+   int comp_type, png_size_t chunklength,
+   png_size_t prefix_length, png_size_t *data_length)) PNG_PRIVATE;
+#endif
+
+/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
+PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip)
+   PNG_PRIVATE);
+
+/* Read the CRC from the file and compare it to the libpng calculated CRC */
+PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr)) PNG_PRIVATE;
+
+/* Calculate the CRC over a section of data.  Note that we are only
+ * passing a maximum of 64K on systems that have this as a memory limit,
+ * since this is the maximum buffer size we can specify.
+ */
+PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
+   png_size_t length)) PNG_PRIVATE;
+
+#ifdef PNG_WRITE_FLUSH_SUPPORTED
+PNG_EXTERN void png_flush PNGARG((png_structp png_ptr)) PNG_PRIVATE;
+#endif
+
+/* Simple function to write the signature */
+PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr)) PNG_PRIVATE;
+
+/* Write various chunks */
+
+/* Write the IHDR chunk, and update the png_struct with the necessary
+ * information.
+ */
+PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
+   png_uint_32 height,
+   int bit_depth, int color_type, int compression_method, int filter_method,
+   int interlace_method)) PNG_PRIVATE;
+
+PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,
+   png_uint_32 num_pal)) PNG_PRIVATE;
+
+PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
+   png_size_t length)) PNG_PRIVATE;
+
+PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr)) PNG_PRIVATE;
+
+#ifdef PNG_WRITE_gAMA_SUPPORTED
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma))
+    PNG_PRIVATE;
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr,
+    png_fixed_point file_gamma)) PNG_PRIVATE;
+#endif
+#endif
+
+#ifdef PNG_WRITE_sBIT_SUPPORTED
+PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,
+   int color_type)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_WRITE_cHRM_SUPPORTED
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
+   double white_x, double white_y,
+   double red_x, double red_y, double green_x, double green_y,
+   double blue_x, double blue_y)) PNG_PRIVATE;
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,
+   png_fixed_point int_white_x, png_fixed_point int_white_y,
+   png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
+   int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
+   png_fixed_point int_blue_y)) PNG_PRIVATE;
+#endif
+#endif
+
+#ifdef PNG_WRITE_sRGB_SUPPORTED
+PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
+   int intent)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_WRITE_iCCP_SUPPORTED
+PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
+   png_charp name, int compression_type,
+   png_charp profile, int proflen)) PNG_PRIVATE;
+   /* Note to maintainer: profile should be png_bytep */
+#endif
+
+#ifdef PNG_WRITE_sPLT_SUPPORTED
+PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
+   png_sPLT_tp palette)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_WRITE_tRNS_SUPPORTED
+PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,
+   png_color_16p values, int number, int color_type)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_WRITE_bKGD_SUPPORTED
+PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
+   png_color_16p values, int color_type)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_WRITE_hIST_SUPPORTED
+PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
+   int num_hist)) PNG_PRIVATE;
+#endif
+
+#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
+    defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
+PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
+   png_charp key, png_charpp new_key)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_WRITE_tEXt_SUPPORTED
+PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key,
+   png_charp text, png_size_t text_len)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_WRITE_zTXt_SUPPORTED
+PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,
+   png_charp text, png_size_t text_len, int compression)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_WRITE_iTXt_SUPPORTED
+PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
+   int compression, png_charp key, png_charp lang, png_charp lang_key,
+   png_charp text)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_TEXT_SUPPORTED  /* Added at version 1.0.14 and 1.2.4 */
+PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_textp text_ptr, int num_text)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_WRITE_oFFs_SUPPORTED
+PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
+   png_int_32 x_offset, png_int_32 y_offset, int unit_type)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_WRITE_pCAL_SUPPORTED
+PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,
+   png_int_32 X0, png_int_32 X1, int type, int nparams,
+   png_charp units, png_charpp params)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_WRITE_pHYs_SUPPORTED
+PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,
+   png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
+   int unit_type)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_WRITE_tIME_SUPPORTED
+PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
+   png_timep mod_time)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_WRITE_sCAL_SUPPORTED
+#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
+PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,
+   int unit, double width, double height)) PNG_PRIVATE;
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
+   int unit, png_charp width, png_charp height)) PNG_PRIVATE;
+#endif
+#endif
+#endif
+
+/* Called when finished processing a row of data */
+PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr)) PNG_PRIVATE;
+
+/* Internal use only.   Called before first row of data */
+PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr)) PNG_PRIVATE;
+
+#ifdef PNG_READ_GAMMA_SUPPORTED
+PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr)) PNG_PRIVATE;
+#endif
+
+/* Combine a row of data, dealing with alpha, etc. if requested */
+PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
+   int mask)) PNG_PRIVATE;
+
+#ifdef PNG_READ_INTERLACING_SUPPORTED
+/* Expand an interlaced row */
+/* OLD pre-1.0.9 interface:
+PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
+   png_bytep row, int pass, png_uint_32 transformations)) PNG_PRIVATE;
+ */
+PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr)) PNG_PRIVATE;
+#endif
+
+/* GRR TO DO (2.0 or whenever):  simplify other internal calling interfaces */
+
+#ifdef PNG_WRITE_INTERLACING_SUPPORTED
+/* Grab pixels out of a row for an interlaced pass */
+PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
+   png_bytep row, int pass)) PNG_PRIVATE;
+#endif
+
+/* Unfilter a row */
+PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
+   png_row_infop row_info, png_bytep row, png_bytep prev_row,
+   int filter)) PNG_PRIVATE;
+
+/* Choose the best filter to use and filter the row data */
+PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
+   png_row_infop row_info)) PNG_PRIVATE;
+
+/* Write out the filtered row. */
+PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
+   png_bytep filtered_row)) PNG_PRIVATE;
+/* Finish a row while reading, dealing with interlacing passes, etc. */
+PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
+
+/* Initialize the row buffers, etc. */
+PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)) PNG_PRIVATE;
+/* Optional call to update the users info structure */
+PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
+   png_infop info_ptr)) PNG_PRIVATE;
+
+/* These are the functions that do the transformations */
+#ifdef PNG_READ_FILLER_SUPPORTED
+PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
+   png_bytep row, png_uint_32 filler, png_uint_32 flags)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED
+PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,
+   png_bytep row)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
+PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
+   png_bytep row)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
+PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,
+   png_bytep row)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
+PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
+   png_bytep row)) PNG_PRIVATE;
+#endif
+
+#if defined(PNG_WRITE_FILLER_SUPPORTED) || \
+    defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
+PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
+   png_bytep row, png_uint_32 flags)) PNG_PRIVATE;
+#endif
+
+#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
+PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info,
+    png_bytep row)) PNG_PRIVATE;
+#endif
+
+#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
+PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info,
+    png_bytep row)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
+PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop
+   row_info, png_bytep row)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
+PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
+   png_bytep row)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_READ_PACK_SUPPORTED
+PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info,
+    png_bytep row)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_READ_SHIFT_SUPPORTED
+PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row,
+   png_color_8p sig_bits)) PNG_PRIVATE;
+#endif
+
+#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
+PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info,
+    png_bytep row)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_READ_16_TO_8_SUPPORTED
+PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info,
+    png_bytep row)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_READ_DITHER_SUPPORTED
+PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info,
+   png_bytep row, png_bytep palette_lookup,
+    png_bytep dither_lookup)) PNG_PRIVATE;
+
+#  ifdef PNG_CORRECT_PALETTE_SUPPORTED
+PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
+   png_colorp palette, int num_palette)) PNG_PRIVATE;
+#  endif
+#endif
+
+#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
+PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info,
+    png_bytep row)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_WRITE_PACK_SUPPORTED
+PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
+   png_bytep row, png_uint_32 bit_depth)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_WRITE_SHIFT_SUPPORTED
+PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row,
+   png_color_8p bit_depth)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_READ_BACKGROUND_SUPPORTED
+#ifdef PNG_READ_GAMMA_SUPPORTED
+PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
+   png_color_16p trans_values, png_color_16p background,
+   png_color_16p background_1,
+   png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
+   png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
+   png_uint_16pp gamma_16_to_1, int gamma_shift)) PNG_PRIVATE;
+#else
+PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
+   png_color_16p trans_values, png_color_16p background)) PNG_PRIVATE;
+#endif
+#endif
+
+#ifdef PNG_READ_GAMMA_SUPPORTED
+PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row,
+   png_bytep gamma_table, png_uint_16pp gamma_16_table,
+   int gamma_shift)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_READ_EXPAND_SUPPORTED
+PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
+   png_bytep row, png_colorp palette, png_bytep trans,
+   int num_trans)) PNG_PRIVATE;
+PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
+   png_bytep row, png_color_16p trans_value)) PNG_PRIVATE;
+#endif
+
+/* The following decodes the appropriate chunks, and does error correction,
+ * then calls the appropriate callback for the chunk if it is valid.
+ */
+
+/* Decode the IHDR chunk */
+PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
+   png_uint_32 length)) PNG_PRIVATE;
+PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
+   png_uint_32 length));
+PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
+   png_uint_32 length));
+
+#ifdef PNG_READ_bKGD_SUPPORTED
+PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
+   png_uint_32 length)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_READ_cHRM_SUPPORTED
+PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
+   png_uint_32 length)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_READ_gAMA_SUPPORTED
+PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
+   png_uint_32 length)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_READ_hIST_SUPPORTED
+PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
+   png_uint_32 length)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_READ_iCCP_SUPPORTED
+extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
+   png_uint_32 length));
+#endif /* PNG_READ_iCCP_SUPPORTED */
+
+#ifdef PNG_READ_iTXt_SUPPORTED
+PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
+   png_uint_32 length)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_READ_oFFs_SUPPORTED
+PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,
+   png_uint_32 length)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_READ_pCAL_SUPPORTED
+PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
+   png_uint_32 length)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_READ_pHYs_SUPPORTED
+PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
+   png_uint_32 length)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_READ_sBIT_SUPPORTED
+PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
+   png_uint_32 length)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_READ_sCAL_SUPPORTED
+PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
+   png_uint_32 length)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_READ_sPLT_SUPPORTED
+extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
+   png_uint_32 length)) PNG_PRIVATE;
+#endif /* PNG_READ_sPLT_SUPPORTED */
+
+#ifdef PNG_READ_sRGB_SUPPORTED
+PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
+   png_uint_32 length)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_READ_tEXt_SUPPORTED
+PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
+   png_uint_32 length)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_READ_tIME_SUPPORTED
+PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
+   png_uint_32 length)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_READ_tRNS_SUPPORTED
+PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
+   png_uint_32 length)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_READ_zTXt_SUPPORTED
+PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
+   png_uint_32 length)) PNG_PRIVATE;
+#endif
+
+PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE;
+
+PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
+   png_bytep chunk_name)) PNG_PRIVATE;
+
+/* Handle the transformations for reading and writing */
+PNG_EXTERN void png_do_read_transformations
+   PNGARG((png_structp png_ptr)) PNG_PRIVATE;
+PNG_EXTERN void png_do_write_transformations
+   PNGARG((png_structp png_ptr)) PNG_PRIVATE;
+
+PNG_EXTERN void png_init_read_transformations
+   PNGARG((png_structp png_ptr)) PNG_PRIVATE;
+
+#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
+PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
+   png_infop info_ptr)) PNG_PRIVATE;
+PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,
+   png_infop info_ptr)) PNG_PRIVATE;
+PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr)) PNG_PRIVATE;
+PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
+   png_uint_32 length)) PNG_PRIVATE;
+PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr)) PNG_PRIVATE;
+PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr)) PNG_PRIVATE;
+PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
+   png_bytep buffer, png_size_t buffer_length)) PNG_PRIVATE;
+PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr)) PNG_PRIVATE;
+PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,
+   png_bytep buffer, png_size_t buffer_length)) PNG_PRIVATE;
+PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr)) PNG_PRIVATE;
+PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE;
+PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,
+   png_infop info_ptr)) PNG_PRIVATE;
+PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,
+   png_infop info_ptr)) PNG_PRIVATE;
+PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr,
+   png_bytep row)) PNG_PRIVATE;
+PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,
+   png_infop info_ptr)) PNG_PRIVATE;
+PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,
+   png_infop info_ptr)) PNG_PRIVATE;
+PNG_EXTERN void png_read_push_finish_row
+   PNGARG((png_structp png_ptr)) PNG_PRIVATE;
+#ifdef PNG_READ_tEXt_SUPPORTED
+PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE;
+PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,
+   png_infop info_ptr)) PNG_PRIVATE;
+#endif
+#ifdef PNG_READ_zTXt_SUPPORTED
+PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE;
+PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
+   png_infop info_ptr)) PNG_PRIVATE;
+#endif
+#ifdef PNG_READ_iTXt_SUPPORTED
+PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE;
+PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
+   png_infop info_ptr)) PNG_PRIVATE;
+#endif
+
+#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
+
+#ifdef PNG_MNG_FEATURES_SUPPORTED
+PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
+   png_bytep row)) PNG_PRIVATE;
+PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
+   png_bytep row)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
+#ifdef PNG_MMX_CODE_SUPPORTED
+/* png.c */ /* PRIVATE */
+PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr)) PNG_PRIVATE;
+#endif
+#endif
+
+
+/* The following six functions will be exported in libpng-1.4.0. */
+#if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
+PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr,
+png_infop info_ptr));
+
+PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr,
+png_infop info_ptr));
+
+PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr,
+png_infop info_ptr));
+
+PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr,
+png_infop info_ptr));
+
+PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr,
+png_infop info_ptr));
+
+#ifdef PNG_pHYs_SUPPORTED
+PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr,
+png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
+#endif /* PNG_pHYs_SUPPORTED */
+#endif  /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
+
+/* Read the chunk header (length + type name) */
+PNG_EXTERN png_uint_32 png_read_chunk_header
+   PNGARG((png_structp png_ptr)) PNG_PRIVATE;
+
+/* Added at libpng version 1.2.34 */
+#ifdef PNG_cHRM_SUPPORTED
+PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr,
+   png_fixed_point int_white_x, png_fixed_point int_white_y,
+   png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
+   int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
+   png_fixed_point int_blue_y)) PNG_PRIVATE;
+#endif
+
+#ifdef PNG_cHRM_SUPPORTED
+#ifdef PNG_CHECK_cHRM_SUPPORTED
+/* Added at libpng version 1.2.34 */
+PNG_EXTERN void png_64bit_product PNGARG((long v1, long v2,
+   unsigned long *hi_product, unsigned long *lo_product)) PNG_PRIVATE;
+#endif
+#endif
+
+/* Added at libpng version 1.2.41 */
+PNG_EXTERN void png_check_IHDR PNGARG((png_structp png_ptr,
+   png_uint_32 width, png_uint_32 height, int bit_depth,
+   int color_type, int interlace_type, int compression_type,
+   int filter_type)) PNG_PRIVATE;
+
+/* Added at libpng version 1.2.41 */
+PNG_EXTERN png_voidp png_calloc PNGARG((png_structp png_ptr,
+   png_uint_32 size));
+
+/* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
+
+#endif /* PNG_INTERNAL */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* PNG_VERSION_INFO_ONLY */
+/* Do not put anything past this line */
+#endif /* PNG_H */
diff --git a/src/libpng/pngconf.h b/src/libpng/pngconf.h
new file mode 100644
index 0000000..57293c3
--- /dev/null
+++ b/src/libpng/pngconf.h
@@ -0,0 +1,1665 @@
+
+/* pngconf.h - machine configurable file for libpng
+ *
+ * libpng version 1.2.46 - July 9, 2011
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ */
+
+/* Any machine specific code is near the front of this file, so if you
+ * are configuring libpng for a machine, you may want to read the section
+ * starting here down to where it starts to typedef png_color, png_text,
+ * and png_info.
+ */
+
+#ifndef PNGCONF_H
+#define PNGCONF_H
+
+#define PNG_1_2_X
+
+/*
+ * PNG_USER_CONFIG has to be defined on the compiler command line. This
+ * includes the resource compiler for Windows DLL configurations.
+ */
+#ifdef PNG_USER_CONFIG
+#  ifndef PNG_USER_PRIVATEBUILD
+#    define PNG_USER_PRIVATEBUILD
+#  endif
+#include "pngusr.h"
+#endif
+
+/* PNG_CONFIGURE_LIBPNG is set by the "configure" script. */
+#ifdef PNG_CONFIGURE_LIBPNG
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+#endif
+
+/*
+ * Added at libpng-1.2.8
+ *
+ * If you create a private DLL you need to define in "pngusr.h" the followings:
+ * #define PNG_USER_PRIVATEBUILD <Describes by whom and why this version of
+ *        the DLL was built>
+ *  e.g. #define PNG_USER_PRIVATEBUILD "Build by MyCompany for xyz reasons."
+ * #define PNG_USER_DLLFNAME_POSTFIX <two-letter postfix that serve to
+ *        distinguish your DLL from those of the official release. These
+ *        correspond to the trailing letters that come after the version
+ *        number and must match your private DLL name>
+ *  e.g. // private DLL "libpng13gx.dll"
+ *       #define PNG_USER_DLLFNAME_POSTFIX "gx"
+ *
+ * The following macros are also at your disposal if you want to complete the
+ * DLL VERSIONINFO structure.
+ * - PNG_USER_VERSIONINFO_COMMENTS
+ * - PNG_USER_VERSIONINFO_COMPANYNAME
+ * - PNG_USER_VERSIONINFO_LEGALTRADEMARKS
+ */
+
+#ifdef __STDC__
+#ifdef SPECIALBUILD
+#  pragma message("PNG_LIBPNG_SPECIALBUILD (and deprecated SPECIALBUILD)\
+ are now LIBPNG reserved macros. Use PNG_USER_PRIVATEBUILD instead.")
+#endif
+
+#ifdef PRIVATEBUILD
+# pragma message("PRIVATEBUILD is deprecated.\
+ Use PNG_USER_PRIVATEBUILD instead.")
+# define PNG_USER_PRIVATEBUILD PRIVATEBUILD
+#endif
+#endif /* __STDC__ */
+
+#ifndef PNG_VERSION_INFO_ONLY
+
+/* End of material added to libpng-1.2.8 */
+
+/* Added at libpng-1.2.19, removed at libpng-1.2.20 because it caused trouble
+   Restored at libpng-1.2.21 */
+#if !defined(PNG_NO_WARN_UNINITIALIZED_ROW) && \
+    !defined(PNG_WARN_UNINITIALIZED_ROW)
+#  define PNG_WARN_UNINITIALIZED_ROW 1
+#endif
+/* End of material added at libpng-1.2.19/1.2.21 */
+
+/* This is the size of the compression buffer, and thus the size of
+ * an IDAT chunk.  Make this whatever size you feel is best for your
+ * machine.  One of these will be allocated per png_struct.  When this
+ * is full, it writes the data to the disk, and does some other
+ * calculations.  Making this an extremely small size will slow
+ * the library down, but you may want to experiment to determine
+ * where it becomes significant, if you are concerned with memory
+ * usage.  Note that zlib allocates at least 32Kb also.  For readers,
+ * this describes the size of the buffer available to read the data in.
+ * Unless this gets smaller than the size of a row (compressed),
+ * it should not make much difference how big this is.
+ */
+
+#ifndef PNG_ZBUF_SIZE
+#  define PNG_ZBUF_SIZE 8192
+#endif
+
+/* Enable if you want a write-only libpng */
+
+#ifndef PNG_NO_READ_SUPPORTED
+#  define PNG_READ_SUPPORTED
+#endif
+
+/* Enable if you want a read-only libpng */
+
+#ifndef PNG_NO_WRITE_SUPPORTED
+#  define PNG_WRITE_SUPPORTED
+#endif
+
+/* Enabled in 1.2.41. */
+#ifdef PNG_ALLOW_BENIGN_ERRORS
+#  define png_benign_error png_warning
+#  define png_chunk_benign_error png_chunk_warning
+#else
+#  ifndef PNG_BENIGN_ERRORS_SUPPORTED
+#    define png_benign_error png_error
+#    define png_chunk_benign_error png_chunk_error
+#  endif
+#endif
+
+/* Added in libpng-1.2.41 */
+#if !defined(PNG_NO_WARNINGS) && !defined(PNG_WARNINGS_SUPPORTED)
+#  define PNG_WARNINGS_SUPPORTED
+#endif
+
+#if !defined(PNG_NO_ERROR_TEXT) && !defined(PNG_ERROR_TEXT_SUPPORTED)
+#  define PNG_ERROR_TEXT_SUPPORTED
+#endif
+
+#if !defined(PNG_NO_CHECK_cHRM) && !defined(PNG_CHECK_cHRM_SUPPORTED)
+#  define PNG_CHECK_cHRM_SUPPORTED
+#endif
+
+/* Enabled by default in 1.2.0.  You can disable this if you don't need to
+ * support PNGs that are embedded in MNG datastreams
+ */
+#if !defined(PNG_1_0_X) && !defined(PNG_NO_MNG_FEATURES)
+#  ifndef PNG_MNG_FEATURES_SUPPORTED
+#    define PNG_MNG_FEATURES_SUPPORTED
+#  endif
+#endif
+
+#ifndef PNG_NO_FLOATING_POINT_SUPPORTED
+#  ifndef PNG_FLOATING_POINT_SUPPORTED
+#    define PNG_FLOATING_POINT_SUPPORTED
+#  endif
+#endif
+
+/* If you are running on a machine where you cannot allocate more
+ * than 64K of memory at once, uncomment this.  While libpng will not
+ * normally need that much memory in a chunk (unless you load up a very
+ * large file), zlib needs to know how big of a chunk it can use, and
+ * libpng thus makes sure to check any memory allocation to verify it
+ * will fit into memory.
+#define PNG_MAX_MALLOC_64K
+ */
+#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
+#  define PNG_MAX_MALLOC_64K
+#endif
+
+/* Special munging to support doing things the 'cygwin' way:
+ * 'Normal' png-on-win32 defines/defaults:
+ *   PNG_BUILD_DLL -- building dll
+ *   PNG_USE_DLL   -- building an application, linking to dll
+ *   (no define)   -- building static library, or building an
+ *                    application and linking to the static lib
+ * 'Cygwin' defines/defaults:
+ *   PNG_BUILD_DLL -- (ignored) building the dll
+ *   (no define)   -- (ignored) building an application, linking to the dll
+ *   PNG_STATIC    -- (ignored) building the static lib, or building an
+ *                    application that links to the static lib.
+ *   ALL_STATIC    -- (ignored) building various static libs, or building an
+ *                    application that links to the static libs.
+ * Thus,
+ * a cygwin user should define either PNG_BUILD_DLL or PNG_STATIC, and
+ * this bit of #ifdefs will define the 'correct' config variables based on
+ * that. If a cygwin user *wants* to define 'PNG_USE_DLL' that's okay, but
+ * unnecessary.
+ *
+ * Also, the precedence order is:
+ *   ALL_STATIC (since we can't #undef something outside our namespace)
+ *   PNG_BUILD_DLL
+ *   PNG_STATIC
+ *   (nothing) == PNG_USE_DLL
+ *
+ * CYGWIN (2002-01-20): The preceding is now obsolete. With the advent
+ *   of auto-import in binutils, we no longer need to worry about
+ *   __declspec(dllexport) / __declspec(dllimport) and friends.  Therefore,
+ *   we don't need to worry about PNG_STATIC or ALL_STATIC when it comes
+ *   to __declspec() stuff.  However, we DO need to worry about
+ *   PNG_BUILD_DLL and PNG_STATIC because those change some defaults
+ *   such as CONSOLE_IO and whether GLOBAL_ARRAYS are allowed.
+ */
+#ifdef __CYGWIN__
+#  ifdef ALL_STATIC
+#    ifdef PNG_BUILD_DLL
+#      undef PNG_BUILD_DLL
+#    endif
+#    ifdef PNG_USE_DLL
+#      undef PNG_USE_DLL
+#    endif
+#    ifdef PNG_DLL
+#      undef PNG_DLL
+#    endif
+#    ifndef PNG_STATIC
+#      define PNG_STATIC
+#    endif
+#  else
+#    ifdef PNG_BUILD_DLL
+#      ifdef PNG_STATIC
+#        undef PNG_STATIC
+#      endif
+#      ifdef PNG_USE_DLL
+#        undef PNG_USE_DLL
+#      endif
+#      ifndef PNG_DLL
+#        define PNG_DLL
+#      endif
+#    else
+#      ifdef PNG_STATIC
+#        ifdef PNG_USE_DLL
+#          undef PNG_USE_DLL
+#        endif
+#        ifdef PNG_DLL
+#          undef PNG_DLL
+#        endif
+#      else
+#        ifndef PNG_USE_DLL
+#          define PNG_USE_DLL
+#        endif
+#        ifndef PNG_DLL
+#          define PNG_DLL
+#        endif
+#      endif
+#    endif
+#  endif
+#endif
+
+/* This protects us against compilers that run on a windowing system
+ * and thus don't have or would rather us not use the stdio types:
+ * stdin, stdout, and stderr.  The only one currently used is stderr
+ * in png_error() and png_warning().  #defining PNG_NO_CONSOLE_IO will
+ * prevent these from being compiled and used. #defining PNG_NO_STDIO
+ * will also prevent these, plus will prevent the entire set of stdio
+ * macros and functions (FILE *, printf, etc.) from being compiled and used,
+ * unless (PNG_DEBUG > 0) has been #defined.
+ *
+ * #define PNG_NO_CONSOLE_IO
+ * #define PNG_NO_STDIO
+ */
+
+#if !defined(PNG_NO_STDIO) && !defined(PNG_STDIO_SUPPORTED)
+#  define PNG_STDIO_SUPPORTED
+#endif
+
+#ifdef _WIN32_WCE
+#  include <windows.h>
+   /* Console I/O functions are not supported on WindowsCE */
+#  define PNG_NO_CONSOLE_IO
+   /* abort() may not be supported on some/all Windows CE platforms */
+#  define PNG_ABORT() exit(-1)
+#  ifdef PNG_DEBUG
+#    undef PNG_DEBUG
+#  endif
+#endif
+
+#ifdef PNG_BUILD_DLL
+#  ifndef PNG_CONSOLE_IO_SUPPORTED
+#    ifndef PNG_NO_CONSOLE_IO
+#      define PNG_NO_CONSOLE_IO
+#    endif
+#  endif
+#endif
+
+#  ifdef PNG_NO_STDIO
+#    ifndef PNG_NO_CONSOLE_IO
+#      define PNG_NO_CONSOLE_IO
+#    endif
+#    ifdef PNG_DEBUG
+#      if (PNG_DEBUG > 0)
+#        include <stdio.h>
+#      endif
+#    endif
+#  else
+#    ifndef _WIN32_WCE
+/* "stdio.h" functions are not supported on WindowsCE */
+#      include <stdio.h>
+#    endif
+#  endif
+
+#if !(defined PNG_NO_CONSOLE_IO) && !defined(PNG_CONSOLE_IO_SUPPORTED)
+#  define PNG_CONSOLE_IO_SUPPORTED
+#endif
+
+/* This macro protects us against machines that don't have function
+ * prototypes (ie K&R style headers).  If your compiler does not handle
+ * function prototypes, define this macro and use the included ansi2knr.
+ * I've always been able to use _NO_PROTO as the indicator, but you may
+ * need to drag the empty declaration out in front of here, or change the
+ * ifdef to suit your own needs.
+ */
+#ifndef PNGARG
+
+#ifdef OF /* zlib prototype munger */
+#  define PNGARG(arglist) OF(arglist)
+#else
+
+#ifdef _NO_PROTO
+#  define PNGARG(arglist) ()
+#  ifndef PNG_TYPECAST_NULL
+#     define PNG_TYPECAST_NULL
+#  endif
+#else
+#  define PNGARG(arglist) arglist
+#endif /* _NO_PROTO */
+
+
+#endif /* OF */
+
+#endif /* PNGARG */
+
+/* Try to determine if we are compiling on a Mac.  Note that testing for
+ * just __MWERKS__ is not good enough, because the Codewarrior is now used
+ * on non-Mac platforms.
+ */
+#ifndef MACOS
+#  if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
+      defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)
+#    define MACOS
+#  endif
+#endif
+
+/* enough people need this for various reasons to include it here */
+#if !defined(MACOS) && !defined(RISCOS) && !defined(_WIN32_WCE)
+#  include <sys/types.h>
+#endif
+
+#if !defined(PNG_SETJMP_NOT_SUPPORTED) && !defined(PNG_NO_SETJMP_SUPPORTED)
+#  define PNG_SETJMP_SUPPORTED
+#endif
+
+#ifdef PNG_SETJMP_SUPPORTED
+/* This is an attempt to force a single setjmp behaviour on Linux.  If
+ * the X config stuff didn't define _BSD_SOURCE we wouldn't need this.
+ *
+ * You can bypass this test if you know that your application uses exactly
+ * the same setjmp.h that was included when libpng was built.  Only define
+ * PNG_SKIP_SETJMP_CHECK while building your application, prior to the
+ * application's '#include "png.h"'. Don't define PNG_SKIP_SETJMP_CHECK
+ * while building a separate libpng library for general use.
+ */
+
+#  ifndef PNG_SKIP_SETJMP_CHECK
+#    ifdef __linux__
+#      ifdef _BSD_SOURCE
+#        define PNG_SAVE_BSD_SOURCE
+#        undef _BSD_SOURCE
+#      endif
+#      ifdef _SETJMP_H
+       /* If you encounter a compiler error here, see the explanation
+        * near the end of INSTALL.
+        */
+           __pngconf.h__ in libpng already includes setjmp.h;
+           __dont__ include it again.;
+#      endif
+#    endif /* __linux__ */
+#  endif /* PNG_SKIP_SETJMP_CHECK */
+
+   /* include setjmp.h for error handling */
+#  include <setjmp.h>
+
+#  ifdef __linux__
+#    ifdef PNG_SAVE_BSD_SOURCE
+#      ifndef _BSD_SOURCE
+#        define _BSD_SOURCE
+#      endif
+#      undef PNG_SAVE_BSD_SOURCE
+#    endif
+#  endif /* __linux__ */
+#endif /* PNG_SETJMP_SUPPORTED */
+
+#ifdef BSD
+#  include <strings.h>
+#else
+#  include <string.h>
+#endif
+
+/* Other defines for things like memory and the like can go here.  */
+#ifdef PNG_INTERNAL
+
+#include <stdlib.h>
+
+/* The functions exported by PNG_EXTERN are PNG_INTERNAL functions, which
+ * aren't usually used outside the library (as far as I know), so it is
+ * debatable if they should be exported at all.  In the future, when it is
+ * possible to have run-time registry of chunk-handling functions, some of
+ * these will be made available again.
+#define PNG_EXTERN extern
+ */
+#define PNG_EXTERN
+
+/* Other defines specific to compilers can go here.  Try to keep
+ * them inside an appropriate ifdef/endif pair for portability.
+ */
+
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+#  ifdef MACOS
+     /* We need to check that <math.h> hasn't already been included earlier
+      * as it seems it doesn't agree with <fp.h>, yet we should really use
+      * <fp.h> if possible.
+      */
+#    if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
+#      include <fp.h>
+#    endif
+#  else
+#    include <math.h>
+#  endif
+#  if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
+     /* Amiga SAS/C: We must include builtin FPU functions when compiling using
+      * MATH=68881
+      */
+#    include <m68881.h>
+#  endif
+#endif
+
+/* Codewarrior on NT has linking problems without this. */
+#if (defined(__MWERKS__) && defined(WIN32)) || defined(__STDC__)
+#  define PNG_ALWAYS_EXTERN
+#endif
+
+/* This provides the non-ANSI (far) memory allocation routines. */
+#if defined(__TURBOC__) && defined(__MSDOS__)
+#  include <mem.h>
+#  include <alloc.h>
+#endif
+
+/* I have no idea why is this necessary... */
+#if defined(_MSC_VER) && (defined(WIN32) || defined(_Windows) || \
+    defined(_WINDOWS) || defined(_WIN32) || defined(__WIN32__))
+#  include <malloc.h>
+#endif
+
+/* This controls how fine the dithering gets.  As this allocates
+ * a largish chunk of memory (32K), those who are not as concerned
+ * with dithering quality can decrease some or all of these.
+ */
+#ifndef PNG_DITHER_RED_BITS
+#  define PNG_DITHER_RED_BITS 5
+#endif
+#ifndef PNG_DITHER_GREEN_BITS
+#  define PNG_DITHER_GREEN_BITS 5
+#endif
+#ifndef PNG_DITHER_BLUE_BITS
+#  define PNG_DITHER_BLUE_BITS 5
+#endif
+
+/* This controls how fine the gamma correction becomes when you
+ * are only interested in 8 bits anyway.  Increasing this value
+ * results in more memory being used, and more pow() functions
+ * being called to fill in the gamma tables.  Don't set this value
+ * less then 8, and even that may not work (I haven't tested it).
+ */
+
+#ifndef PNG_MAX_GAMMA_8
+#  define PNG_MAX_GAMMA_8 11
+#endif
+
+/* This controls how much a difference in gamma we can tolerate before
+ * we actually start doing gamma conversion.
+ */
+#ifndef PNG_GAMMA_THRESHOLD
+#  define PNG_GAMMA_THRESHOLD 0.05
+#endif
+
+#endif /* PNG_INTERNAL */
+
+/* The following uses const char * instead of char * for error
+ * and warning message functions, so some compilers won't complain.
+ * If you do not want to use const, define PNG_NO_CONST here.
+ */
+
+#ifndef PNG_NO_CONST
+#  define PNG_CONST const
+#else
+#  define PNG_CONST
+#endif
+
+/* The following defines give you the ability to remove code from the
+ * library that you will not be using.  I wish I could figure out how to
+ * automate this, but I can't do that without making it seriously hard
+ * on the users.  So if you are not using an ability, change the #define
+ * to and #undef, and that part of the library will not be compiled.  If
+ * your linker can't find a function, you may want to make sure the
+ * ability is defined here.  Some of these depend upon some others being
+ * defined.  I haven't figured out all the interactions here, so you may
+ * have to experiment awhile to get everything to compile.  If you are
+ * creating or using a shared library, you probably shouldn't touch this,
+ * as it will affect the size of the structures, and this will cause bad
+ * things to happen if the library and/or application ever change.
+ */
+
+/* Any features you will not be using can be undef'ed here */
+
+/* GR-P, 0.96a: Set "*TRANSFORMS_SUPPORTED as default but allow user
+ * to turn it off with "*TRANSFORMS_NOT_SUPPORTED" or *PNG_NO_*_TRANSFORMS
+ * on the compile line, then pick and choose which ones to define without
+ * having to edit this file. It is safe to use the *TRANSFORMS_NOT_SUPPORTED
+ * if you only want to have a png-compliant reader/writer but don't need
+ * any of the extra transformations.  This saves about 80 kbytes in a
+ * typical installation of the library. (PNG_NO_* form added in version
+ * 1.0.1c, for consistency)
+ */
+
+/* The size of the png_text structure changed in libpng-1.0.6 when
+ * iTXt support was added.  iTXt support was turned off by default through
+ * libpng-1.2.x, to support old apps that malloc the png_text structure
+ * instead of calling png_set_text() and letting libpng malloc it.  It
+ * will be turned on by default in libpng-1.4.0.
+ */
+
+#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
+#  ifndef PNG_NO_iTXt_SUPPORTED
+#    define PNG_NO_iTXt_SUPPORTED
+#  endif
+#  ifndef PNG_NO_READ_iTXt
+#    define PNG_NO_READ_iTXt
+#  endif
+#  ifndef PNG_NO_WRITE_iTXt
+#    define PNG_NO_WRITE_iTXt
+#  endif
+#endif
+
+#if !defined(PNG_NO_iTXt_SUPPORTED)
+#  if !defined(PNG_READ_iTXt_SUPPORTED) && !defined(PNG_NO_READ_iTXt)
+#    define PNG_READ_iTXt
+#  endif
+#  if !defined(PNG_WRITE_iTXt_SUPPORTED) && !defined(PNG_NO_WRITE_iTXt)
+#    define PNG_WRITE_iTXt
+#  endif
+#endif
+
+/* The following support, added after version 1.0.0, can be turned off here en
+ * masse by defining PNG_LEGACY_SUPPORTED in case you need binary compatibility
+ * with old applications that require the length of png_struct and png_info
+ * to remain unchanged.
+ */
+
+#ifdef PNG_LEGACY_SUPPORTED
+#  define PNG_NO_FREE_ME
+#  define PNG_NO_READ_UNKNOWN_CHUNKS
+#  define PNG_NO_WRITE_UNKNOWN_CHUNKS
+#  define PNG_NO_HANDLE_AS_UNKNOWN
+#  define PNG_NO_READ_USER_CHUNKS
+#  define PNG_NO_READ_iCCP
+#  define PNG_NO_WRITE_iCCP
+#  define PNG_NO_READ_iTXt
+#  define PNG_NO_WRITE_iTXt
+#  define PNG_NO_READ_sCAL
+#  define PNG_NO_WRITE_sCAL
+#  define PNG_NO_READ_sPLT
+#  define PNG_NO_WRITE_sPLT
+#  define PNG_NO_INFO_IMAGE
+#  define PNG_NO_READ_RGB_TO_GRAY
+#  define PNG_NO_READ_USER_TRANSFORM
+#  define PNG_NO_WRITE_USER_TRANSFORM
+#  define PNG_NO_USER_MEM
+#  define PNG_NO_READ_EMPTY_PLTE
+#  define PNG_NO_MNG_FEATURES
+#  define PNG_NO_FIXED_POINT_SUPPORTED
+#endif
+
+/* Ignore attempt to turn off both floating and fixed point support */
+#if !defined(PNG_FLOATING_POINT_SUPPORTED) || \
+    !defined(PNG_NO_FIXED_POINT_SUPPORTED)
+#  define PNG_FIXED_POINT_SUPPORTED
+#endif
+
+#ifndef PNG_NO_FREE_ME
+#  define PNG_FREE_ME_SUPPORTED
+#endif
+
+#ifdef PNG_READ_SUPPORTED
+
+#if !defined(PNG_READ_TRANSFORMS_NOT_SUPPORTED) && \
+      !defined(PNG_NO_READ_TRANSFORMS)
+#  define PNG_READ_TRANSFORMS_SUPPORTED
+#endif
+
+#ifdef PNG_READ_TRANSFORMS_SUPPORTED
+#  ifndef PNG_NO_READ_EXPAND
+#    define PNG_READ_EXPAND_SUPPORTED
+#  endif
+#  ifndef PNG_NO_READ_SHIFT
+#    define PNG_READ_SHIFT_SUPPORTED
+#  endif
+#  ifndef PNG_NO_READ_PACK
+#    define PNG_READ_PACK_SUPPORTED
+#  endif
+#  ifndef PNG_NO_READ_BGR
+#    define PNG_READ_BGR_SUPPORTED
+#  endif
+#  ifndef PNG_NO_READ_SWAP
+#    define PNG_READ_SWAP_SUPPORTED
+#  endif
+#  ifndef PNG_NO_READ_PACKSWAP
+#    define PNG_READ_PACKSWAP_SUPPORTED
+#  endif
+#  ifndef PNG_NO_READ_INVERT
+#    define PNG_READ_INVERT_SUPPORTED
+#  endif
+#  ifndef PNG_NO_READ_DITHER
+#    define PNG_READ_DITHER_SUPPORTED
+#  endif
+#  ifndef PNG_NO_READ_BACKGROUND
+#    define PNG_READ_BACKGROUND_SUPPORTED
+#  endif
+#  ifndef PNG_NO_READ_16_TO_8
+#    define PNG_READ_16_TO_8_SUPPORTED
+#  endif
+#  ifndef PNG_NO_READ_FILLER
+#    define PNG_READ_FILLER_SUPPORTED
+#  endif
+#  ifndef PNG_NO_READ_GAMMA
+#    define PNG_READ_GAMMA_SUPPORTED
+#  endif
+#  ifndef PNG_NO_READ_GRAY_TO_RGB
+#    define PNG_READ_GRAY_TO_RGB_SUPPORTED
+#  endif
+#  ifndef PNG_NO_READ_SWAP_ALPHA
+#    define PNG_READ_SWAP_ALPHA_SUPPORTED
+#  endif
+#  ifndef PNG_NO_READ_INVERT_ALPHA
+#    define PNG_READ_INVERT_ALPHA_SUPPORTED
+#  endif
+#  ifndef PNG_NO_READ_STRIP_ALPHA
+#    define PNG_READ_STRIP_ALPHA_SUPPORTED
+#  endif
+#  ifndef PNG_NO_READ_USER_TRANSFORM
+#    define PNG_READ_USER_TRANSFORM_SUPPORTED
+#  endif
+#  ifndef PNG_NO_READ_RGB_TO_GRAY
+#    define PNG_READ_RGB_TO_GRAY_SUPPORTED
+#  endif
+#endif /* PNG_READ_TRANSFORMS_SUPPORTED */
+
+/* PNG_PROGRESSIVE_READ_NOT_SUPPORTED is deprecated. */
+#if !defined(PNG_NO_PROGRESSIVE_READ) && \
+ !defined(PNG_PROGRESSIVE_READ_NOT_SUPPORTED)  /* if you don't do progressive */
+#  define PNG_PROGRESSIVE_READ_SUPPORTED     /* reading.  This is not talking */
+#endif                               /* about interlacing capability!  You'll */
+            /* still have interlacing unless you change the following define: */
+#define PNG_READ_INTERLACING_SUPPORTED /* required for PNG-compliant decoders */
+
+/* PNG_NO_SEQUENTIAL_READ_SUPPORTED is deprecated. */
+#if !defined(PNG_NO_SEQUENTIAL_READ) && \
+    !defined(PNG_SEQUENTIAL_READ_SUPPORTED) && \
+    !defined(PNG_NO_SEQUENTIAL_READ_SUPPORTED)
+#  define PNG_SEQUENTIAL_READ_SUPPORTED
+#endif
+
+#define PNG_READ_INTERLACING_SUPPORTED /* required in PNG-compliant decoders */
+
+#ifndef PNG_NO_READ_COMPOSITE_NODIV
+#  ifndef PNG_NO_READ_COMPOSITED_NODIV  /* libpng-1.0.x misspelling */
+#    define PNG_READ_COMPOSITE_NODIV_SUPPORTED  /* well tested on Intel, SGI */
+#  endif
+#endif
+
+#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
+/* Deprecated, will be removed from version 2.0.0.
+   Use PNG_MNG_FEATURES_SUPPORTED instead. */
+#ifndef PNG_NO_READ_EMPTY_PLTE
+#  define PNG_READ_EMPTY_PLTE_SUPPORTED
+#endif
+#endif
+
+#endif /* PNG_READ_SUPPORTED */
+
+#ifdef PNG_WRITE_SUPPORTED
+
+# if !defined(PNG_WRITE_TRANSFORMS_NOT_SUPPORTED) && \
+    !defined(PNG_NO_WRITE_TRANSFORMS)
+#  define PNG_WRITE_TRANSFORMS_SUPPORTED
+#endif
+
+#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
+#  ifndef PNG_NO_WRITE_SHIFT
+#    define PNG_WRITE_SHIFT_SUPPORTED
+#  endif
+#  ifndef PNG_NO_WRITE_PACK
+#    define PNG_WRITE_PACK_SUPPORTED
+#  endif
+#  ifndef PNG_NO_WRITE_BGR
+#    define PNG_WRITE_BGR_SUPPORTED
+#  endif
+#  ifndef PNG_NO_WRITE_SWAP
+#    define PNG_WRITE_SWAP_SUPPORTED
+#  endif
+#  ifndef PNG_NO_WRITE_PACKSWAP
+#    define PNG_WRITE_PACKSWAP_SUPPORTED
+#  endif
+#  ifndef PNG_NO_WRITE_INVERT
+#    define PNG_WRITE_INVERT_SUPPORTED
+#  endif
+#  ifndef PNG_NO_WRITE_FILLER
+#    define PNG_WRITE_FILLER_SUPPORTED   /* same as WRITE_STRIP_ALPHA */
+#  endif
+#  ifndef PNG_NO_WRITE_SWAP_ALPHA
+#    define PNG_WRITE_SWAP_ALPHA_SUPPORTED
+#  endif
+#ifndef PNG_1_0_X
+#  ifndef PNG_NO_WRITE_INVERT_ALPHA
+#    define PNG_WRITE_INVERT_ALPHA_SUPPORTED
+#  endif
+#endif
+#  ifndef PNG_NO_WRITE_USER_TRANSFORM
+#    define PNG_WRITE_USER_TRANSFORM_SUPPORTED
+#  endif
+#endif /* PNG_WRITE_TRANSFORMS_SUPPORTED */
+
+#if !defined(PNG_NO_WRITE_INTERLACING_SUPPORTED) && \
+    !defined(PNG_WRITE_INTERLACING_SUPPORTED)
+#define PNG_WRITE_INTERLACING_SUPPORTED  /* not required for PNG-compliant
+                                            encoders, but can cause trouble
+                                            if left undefined */
+#endif
+
+#if !defined(PNG_NO_WRITE_WEIGHTED_FILTER) && \
+    !defined(PNG_WRITE_WEIGHTED_FILTER) && \
+     defined(PNG_FLOATING_POINT_SUPPORTED)
+#  define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
+#endif
+
+#ifndef PNG_NO_WRITE_FLUSH
+#  define PNG_WRITE_FLUSH_SUPPORTED
+#endif
+
+#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
+/* Deprecated, see PNG_MNG_FEATURES_SUPPORTED, above */
+#ifndef PNG_NO_WRITE_EMPTY_PLTE
+#  define PNG_WRITE_EMPTY_PLTE_SUPPORTED
+#endif
+#endif
+
+#endif /* PNG_WRITE_SUPPORTED */
+
+#ifndef PNG_1_0_X
+#  ifndef PNG_NO_ERROR_NUMBERS
+#    define PNG_ERROR_NUMBERS_SUPPORTED
+#  endif
+#endif /* PNG_1_0_X */
+
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
+    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+#  ifndef PNG_NO_USER_TRANSFORM_PTR
+#    define PNG_USER_TRANSFORM_PTR_SUPPORTED
+#  endif
+#endif
+
+#ifndef PNG_NO_STDIO
+#  define PNG_TIME_RFC1123_SUPPORTED
+#endif
+
+/* This adds extra functions in pngget.c for accessing data from the
+ * info pointer (added in version 0.99)
+ * png_get_image_width()
+ * png_get_image_height()
+ * png_get_bit_depth()
+ * png_get_color_type()
+ * png_get_compression_type()
+ * png_get_filter_type()
+ * png_get_interlace_type()
+ * png_get_pixel_aspect_ratio()
+ * png_get_pixels_per_meter()
+ * png_get_x_offset_pixels()
+ * png_get_y_offset_pixels()
+ * png_get_x_offset_microns()
+ * png_get_y_offset_microns()
+ */
+#if !defined(PNG_NO_EASY_ACCESS) && !defined(PNG_EASY_ACCESS_SUPPORTED)
+#  define PNG_EASY_ACCESS_SUPPORTED
+#endif
+
+/* PNG_ASSEMBLER_CODE was enabled by default in version 1.2.0
+ * and removed from version 1.2.20.  The following will be removed
+ * from libpng-1.4.0
+*/
+
+#if defined(PNG_READ_SUPPORTED) && !defined(PNG_NO_OPTIMIZED_CODE)
+#  ifndef PNG_OPTIMIZED_CODE_SUPPORTED
+#    define PNG_OPTIMIZED_CODE_SUPPORTED
+#  endif
+#endif
+
+#if defined(PNG_READ_SUPPORTED) && !defined(PNG_NO_ASSEMBLER_CODE)
+#  ifndef PNG_ASSEMBLER_CODE_SUPPORTED
+#    define PNG_ASSEMBLER_CODE_SUPPORTED
+#  endif
+
+#  if defined(__GNUC__) && defined(__x86_64__) && (__GNUC__ < 4)
+     /* work around 64-bit gcc compiler bugs in gcc-3.x */
+#    if !defined(PNG_MMX_CODE_SUPPORTED) && !defined(PNG_NO_MMX_CODE)
+#      define PNG_NO_MMX_CODE
+#    endif
+#  endif
+
+#  ifdef __APPLE__
+#    if !defined(PNG_MMX_CODE_SUPPORTED) && !defined(PNG_NO_MMX_CODE)
+#      define PNG_NO_MMX_CODE
+#    endif
+#  endif
+
+#  if (defined(__MWERKS__) && ((__MWERKS__ < 0x0900) || macintosh))
+#    if !defined(PNG_MMX_CODE_SUPPORTED) && !defined(PNG_NO_MMX_CODE)
+#      define PNG_NO_MMX_CODE
+#    endif
+#  endif
+
+#  if !defined(PNG_MMX_CODE_SUPPORTED) && !defined(PNG_NO_MMX_CODE)
+#    define PNG_MMX_CODE_SUPPORTED
+#  endif
+
+#endif
+/* end of obsolete code to be removed from libpng-1.4.0 */
+
+/* Added at libpng-1.2.0 */
+#ifndef PNG_1_0_X
+#if !defined(PNG_NO_USER_MEM) && !defined(PNG_USER_MEM_SUPPORTED)
+#  define PNG_USER_MEM_SUPPORTED
+#endif
+#endif /* PNG_1_0_X */
+
+/* Added at libpng-1.2.6 */
+#ifndef PNG_1_0_X
+#  ifndef PNG_SET_USER_LIMITS_SUPPORTED
+#    ifndef PNG_NO_SET_USER_LIMITS
+#      define PNG_SET_USER_LIMITS_SUPPORTED
+#    endif
+#  endif
+#endif /* PNG_1_0_X */
+
+/* Added at libpng-1.0.53 and 1.2.43 */
+#ifndef PNG_USER_LIMITS_SUPPORTED
+#  ifndef PNG_NO_USER_LIMITS
+#    define PNG_USER_LIMITS_SUPPORTED
+#  endif
+#endif
+
+/* Added at libpng-1.0.16 and 1.2.6.  To accept all valid PNGS no matter
+ * how large, set these limits to 0x7fffffffL
+ */
+#ifndef PNG_USER_WIDTH_MAX
+#  define PNG_USER_WIDTH_MAX 1000000L
+#endif
+#ifndef PNG_USER_HEIGHT_MAX
+#  define PNG_USER_HEIGHT_MAX 1000000L
+#endif
+
+/* Added at libpng-1.2.43.  To accept all valid PNGs no matter
+ * how large, set these two limits to 0.
+ */
+#ifndef PNG_USER_CHUNK_CACHE_MAX
+#  define PNG_USER_CHUNK_CACHE_MAX 0
+#endif
+
+/* Added at libpng-1.2.43 */
+#ifndef PNG_USER_CHUNK_MALLOC_MAX
+#  define PNG_USER_CHUNK_MALLOC_MAX 0
+#endif
+
+#ifndef PNG_LITERAL_SHARP
+#  define PNG_LITERAL_SHARP 0x23
+#endif
+#ifndef PNG_LITERAL_LEFT_SQUARE_BRACKET
+#  define PNG_LITERAL_LEFT_SQUARE_BRACKET 0x5b
+#endif
+#ifndef PNG_LITERAL_RIGHT_SQUARE_BRACKET
+#  define PNG_LITERAL_RIGHT_SQUARE_BRACKET 0x5d
+#endif
+
+/* Added at libpng-1.2.34 */
+#ifndef PNG_STRING_NEWLINE
+#define PNG_STRING_NEWLINE "\n"
+#endif
+
+/* These are currently experimental features, define them if you want */
+
+/* very little testing */
+/*
+#ifdef PNG_READ_SUPPORTED
+#  ifndef PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
+#    define PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
+#  endif
+#endif
+*/
+
+/* This is only for PowerPC big-endian and 680x0 systems */
+/* some testing */
+/*
+#ifndef PNG_READ_BIG_ENDIAN_SUPPORTED
+#  define PNG_READ_BIG_ENDIAN_SUPPORTED
+#endif
+*/
+
+/* Buggy compilers (e.g., gcc 2.7.2.2) need this */
+/*
+#define PNG_NO_POINTER_INDEXING
+*/
+
+#if !defined(PNG_NO_POINTER_INDEXING) && \
+    !defined(PNG_POINTER_INDEXING_SUPPORTED)
+#  define PNG_POINTER_INDEXING_SUPPORTED
+#endif
+
+/* These functions are turned off by default, as they will be phased out. */
+/*
+#define  PNG_USELESS_TESTS_SUPPORTED
+#define  PNG_CORRECT_PALETTE_SUPPORTED
+*/
+
+/* Any chunks you are not interested in, you can undef here.  The
+ * ones that allocate memory may be expecially important (hIST,
+ * tEXt, zTXt, tRNS, pCAL).  Others will just save time and make png_info
+ * a bit smaller.
+ */
+
+#if defined(PNG_READ_SUPPORTED) && \
+    !defined(PNG_READ_ANCILLARY_CHUNKS_NOT_SUPPORTED) && \
+    !defined(PNG_NO_READ_ANCILLARY_CHUNKS)
+#  define PNG_READ_ANCILLARY_CHUNKS_SUPPORTED
+#endif
+
+#if defined(PNG_WRITE_SUPPORTED) && \
+    !defined(PNG_WRITE_ANCILLARY_CHUNKS_NOT_SUPPORTED) && \
+    !defined(PNG_NO_WRITE_ANCILLARY_CHUNKS)
+#  define PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED
+#endif
+
+#ifdef PNG_READ_ANCILLARY_CHUNKS_SUPPORTED
+
+#ifdef PNG_NO_READ_TEXT
+#  define PNG_NO_READ_iTXt
+#  define PNG_NO_READ_tEXt
+#  define PNG_NO_READ_zTXt
+#endif
+#ifndef PNG_NO_READ_bKGD
+#  define PNG_READ_bKGD_SUPPORTED
+#  define PNG_bKGD_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_cHRM
+#  define PNG_READ_cHRM_SUPPORTED
+#  define PNG_cHRM_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_gAMA
+#  define PNG_READ_gAMA_SUPPORTED
+#  define PNG_gAMA_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_hIST
+#  define PNG_READ_hIST_SUPPORTED
+#  define PNG_hIST_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_iCCP
+#  define PNG_READ_iCCP_SUPPORTED
+#  define PNG_iCCP_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_iTXt
+#  ifndef PNG_READ_iTXt_SUPPORTED
+#    define PNG_READ_iTXt_SUPPORTED
+#  endif
+#  ifndef PNG_iTXt_SUPPORTED
+#    define PNG_iTXt_SUPPORTED
+#  endif
+#endif
+#ifndef PNG_NO_READ_oFFs
+#  define PNG_READ_oFFs_SUPPORTED
+#  define PNG_oFFs_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_pCAL
+#  define PNG_READ_pCAL_SUPPORTED
+#  define PNG_pCAL_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_sCAL
+#  define PNG_READ_sCAL_SUPPORTED
+#  define PNG_sCAL_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_pHYs
+#  define PNG_READ_pHYs_SUPPORTED
+#  define PNG_pHYs_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_sBIT
+#  define PNG_READ_sBIT_SUPPORTED
+#  define PNG_sBIT_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_sPLT
+#  define PNG_READ_sPLT_SUPPORTED
+#  define PNG_sPLT_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_sRGB
+#  define PNG_READ_sRGB_SUPPORTED
+#  define PNG_sRGB_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_tEXt
+#  define PNG_READ_tEXt_SUPPORTED
+#  define PNG_tEXt_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_tIME
+#  define PNG_READ_tIME_SUPPORTED
+#  define PNG_tIME_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_tRNS
+#  define PNG_READ_tRNS_SUPPORTED
+#  define PNG_tRNS_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_zTXt
+#  define PNG_READ_zTXt_SUPPORTED
+#  define PNG_zTXt_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_OPT_PLTE
+#  define PNG_READ_OPT_PLTE_SUPPORTED /* only affects support of the */
+#endif                      /* optional PLTE chunk in RGB and RGBA images */
+#if defined(PNG_READ_iTXt_SUPPORTED) || defined(PNG_READ_tEXt_SUPPORTED) || \
+    defined(PNG_READ_zTXt_SUPPORTED)
+#  define PNG_READ_TEXT_SUPPORTED
+#  define PNG_TEXT_SUPPORTED
+#endif
+
+#endif /* PNG_READ_ANCILLARY_CHUNKS_SUPPORTED */
+
+#ifndef PNG_NO_READ_UNKNOWN_CHUNKS
+#  define PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
+#  ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED
+#    define PNG_UNKNOWN_CHUNKS_SUPPORTED
+#  endif
+#endif
+#if !defined(PNG_NO_READ_USER_CHUNKS) && \
+     defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
+#  define PNG_READ_USER_CHUNKS_SUPPORTED
+#  define PNG_USER_CHUNKS_SUPPORTED
+#  ifdef PNG_NO_READ_UNKNOWN_CHUNKS
+#    undef PNG_NO_READ_UNKNOWN_CHUNKS
+#  endif
+#  ifdef PNG_NO_HANDLE_AS_UNKNOWN
+#    undef PNG_NO_HANDLE_AS_UNKNOWN
+#  endif
+#endif
+
+#ifndef PNG_NO_HANDLE_AS_UNKNOWN
+#  ifndef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+#    define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+#  endif
+#endif
+
+#ifdef PNG_WRITE_SUPPORTED
+#ifdef PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED
+
+#ifdef PNG_NO_WRITE_TEXT
+#  define PNG_NO_WRITE_iTXt
+#  define PNG_NO_WRITE_tEXt
+#  define PNG_NO_WRITE_zTXt
+#endif
+#ifndef PNG_NO_WRITE_bKGD
+#  define PNG_WRITE_bKGD_SUPPORTED
+#  ifndef PNG_bKGD_SUPPORTED
+#    define PNG_bKGD_SUPPORTED
+#  endif
+#endif
+#ifndef PNG_NO_WRITE_cHRM
+#  define PNG_WRITE_cHRM_SUPPORTED
+#  ifndef PNG_cHRM_SUPPORTED
+#    define PNG_cHRM_SUPPORTED
+#  endif
+#endif
+#ifndef PNG_NO_WRITE_gAMA
+#  define PNG_WRITE_gAMA_SUPPORTED
+#  ifndef PNG_gAMA_SUPPORTED
+#    define PNG_gAMA_SUPPORTED
+#  endif
+#endif
+#ifndef PNG_NO_WRITE_hIST
+#  define PNG_WRITE_hIST_SUPPORTED
+#  ifndef PNG_hIST_SUPPORTED
+#    define PNG_hIST_SUPPORTED
+#  endif
+#endif
+#ifndef PNG_NO_WRITE_iCCP
+#  define PNG_WRITE_iCCP_SUPPORTED
+#  ifndef PNG_iCCP_SUPPORTED
+#    define PNG_iCCP_SUPPORTED
+#  endif
+#endif
+#ifndef PNG_NO_WRITE_iTXt
+#  ifndef PNG_WRITE_iTXt_SUPPORTED
+#    define PNG_WRITE_iTXt_SUPPORTED
+#  endif
+#  ifndef PNG_iTXt_SUPPORTED
+#    define PNG_iTXt_SUPPORTED
+#  endif
+#endif
+#ifndef PNG_NO_WRITE_oFFs
+#  define PNG_WRITE_oFFs_SUPPORTED
+#  ifndef PNG_oFFs_SUPPORTED
+#    define PNG_oFFs_SUPPORTED
+#  endif
+#endif
+#ifndef PNG_NO_WRITE_pCAL
+#  define PNG_WRITE_pCAL_SUPPORTED
+#  ifndef PNG_pCAL_SUPPORTED
+#    define PNG_pCAL_SUPPORTED
+#  endif
+#endif
+#ifndef PNG_NO_WRITE_sCAL
+#  define PNG_WRITE_sCAL_SUPPORTED
+#  ifndef PNG_sCAL_SUPPORTED
+#    define PNG_sCAL_SUPPORTED
+#  endif
+#endif
+#ifndef PNG_NO_WRITE_pHYs
+#  define PNG_WRITE_pHYs_SUPPORTED
+#  ifndef PNG_pHYs_SUPPORTED
+#    define PNG_pHYs_SUPPORTED
+#  endif
+#endif
+#ifndef PNG_NO_WRITE_sBIT
+#  define PNG_WRITE_sBIT_SUPPORTED
+#  ifndef PNG_sBIT_SUPPORTED
+#    define PNG_sBIT_SUPPORTED
+#  endif
+#endif
+#ifndef PNG_NO_WRITE_sPLT
+#  define PNG_WRITE_sPLT_SUPPORTED
+#  ifndef PNG_sPLT_SUPPORTED
+#    define PNG_sPLT_SUPPORTED
+#  endif
+#endif
+#ifndef PNG_NO_WRITE_sRGB
+#  define PNG_WRITE_sRGB_SUPPORTED
+#  ifndef PNG_sRGB_SUPPORTED
+#    define PNG_sRGB_SUPPORTED
+#  endif
+#endif
+#ifndef PNG_NO_WRITE_tEXt
+#  define PNG_WRITE_tEXt_SUPPORTED
+#  ifndef PNG_tEXt_SUPPORTED
+#    define PNG_tEXt_SUPPORTED
+#  endif
+#endif
+#ifndef PNG_NO_WRITE_tIME
+#  define PNG_WRITE_tIME_SUPPORTED
+#  ifndef PNG_tIME_SUPPORTED
+#    define PNG_tIME_SUPPORTED
+#  endif
+#endif
+#ifndef PNG_NO_WRITE_tRNS
+#  define PNG_WRITE_tRNS_SUPPORTED
+#  ifndef PNG_tRNS_SUPPORTED
+#    define PNG_tRNS_SUPPORTED
+#  endif
+#endif
+#ifndef PNG_NO_WRITE_zTXt
+#  define PNG_WRITE_zTXt_SUPPORTED
+#  ifndef PNG_zTXt_SUPPORTED
+#    define PNG_zTXt_SUPPORTED
+#  endif
+#endif
+#if defined(PNG_WRITE_iTXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \
+    defined(PNG_WRITE_zTXt_SUPPORTED)
+#  define PNG_WRITE_TEXT_SUPPORTED
+#  ifndef PNG_TEXT_SUPPORTED
+#    define PNG_TEXT_SUPPORTED
+#  endif
+#endif
+
+#ifdef PNG_WRITE_tIME_SUPPORTED
+#  ifndef PNG_NO_CONVERT_tIME
+#    ifndef _WIN32_WCE
+/*   The "tm" structure is not supported on WindowsCE */
+#      ifndef PNG_CONVERT_tIME_SUPPORTED
+#        define PNG_CONVERT_tIME_SUPPORTED
+#      endif
+#   endif
+#  endif
+#endif
+
+#endif /* PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED */
+
+#if !defined(PNG_NO_WRITE_FILTER) && !defined(PNG_WRITE_FILTER_SUPPORTED)
+#  define PNG_WRITE_FILTER_SUPPORTED
+#endif
+
+#ifndef PNG_NO_WRITE_UNKNOWN_CHUNKS
+#  define PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
+#  ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED
+#    define PNG_UNKNOWN_CHUNKS_SUPPORTED
+#  endif
+#endif
+
+#ifndef PNG_NO_HANDLE_AS_UNKNOWN
+#  ifndef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+#    define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+#  endif
+#endif
+#endif /* PNG_WRITE_SUPPORTED */
+
+/* Turn this off to disable png_read_png() and
+ * png_write_png() and leave the row_pointers member
+ * out of the info structure.
+ */
+#ifndef PNG_NO_INFO_IMAGE
+#  define PNG_INFO_IMAGE_SUPPORTED
+#endif
+
+/* Need the time information for converting tIME chunks */
+#ifdef PNG_CONVERT_tIME_SUPPORTED
+     /* "time.h" functions are not supported on WindowsCE */
+#    include <time.h>
+#endif
+
+/* Some typedefs to get us started.  These should be safe on most of the
+ * common platforms.  The typedefs should be at least as large as the
+ * numbers suggest (a png_uint_32 must be at least 32 bits long), but they
+ * don't have to be exactly that size.  Some compilers dislike passing
+ * unsigned shorts as function parameters, so you may be better off using
+ * unsigned int for png_uint_16.  Likewise, for 64-bit systems, you may
+ * want to have unsigned int for png_uint_32 instead of unsigned long.
+ */
+
+typedef unsigned long png_uint_32;
+typedef long png_int_32;
+typedef unsigned short png_uint_16;
+typedef short png_int_16;
+typedef unsigned char png_byte;
+
+/* This is usually size_t.  It is typedef'ed just in case you need it to
+   change (I'm not sure if you will or not, so I thought I'd be safe) */
+#ifdef PNG_SIZE_T
+   typedef PNG_SIZE_T png_size_t;
+#  define png_sizeof(x) png_convert_size(sizeof(x))
+#else
+   typedef size_t png_size_t;
+#  define png_sizeof(x) sizeof(x)
+#endif
+
+/* The following is needed for medium model support.  It cannot be in the
+ * PNG_INTERNAL section.  Needs modification for other compilers besides
+ * MSC.  Model independent support declares all arrays and pointers to be
+ * large using the far keyword.  The zlib version used must also support
+ * model independent data.  As of version zlib 1.0.4, the necessary changes
+ * have been made in zlib.  The USE_FAR_KEYWORD define triggers other
+ * changes that are needed. (Tim Wegner)
+ */
+
+/* Separate compiler dependencies (problem here is that zlib.h always
+   defines FAR. (SJT) */
+#ifdef __BORLANDC__
+#  if defined(__LARGE__) || defined(__HUGE__) || defined(__COMPACT__)
+#    define LDATA 1
+#  else
+#    define LDATA 0
+#  endif
+   /* GRR:  why is Cygwin in here?  Cygwin is not Borland C... */
+#  if !defined(__WIN32__) && !defined(__FLAT__) && !defined(__CYGWIN__)
+#    define PNG_MAX_MALLOC_64K
+#    if (LDATA != 1)
+#      ifndef FAR
+#        define FAR __far
+#      endif
+#      define USE_FAR_KEYWORD
+#    endif   /* LDATA != 1 */
+     /* Possibly useful for moving data out of default segment.
+      * Uncomment it if you want. Could also define FARDATA as
+      * const if your compiler supports it. (SJT)
+#    define FARDATA FAR
+      */
+#  endif  /* __WIN32__, __FLAT__, __CYGWIN__ */
+#endif   /* __BORLANDC__ */
+
+
+/* Suggest testing for specific compiler first before testing for
+ * FAR.  The Watcom compiler defines both __MEDIUM__ and M_I86MM,
+ * making reliance oncertain keywords suspect. (SJT)
+ */
+
+/* MSC Medium model */
+#ifdef FAR
+#  ifdef M_I86MM
+#    define USE_FAR_KEYWORD
+#    define FARDATA FAR
+#    include <dos.h>
+#  endif
+#endif
+
+/* SJT: default case */
+#ifndef FAR
+#  define FAR
+#endif
+
+/* At this point FAR is always defined */
+#ifndef FARDATA
+#  define FARDATA
+#endif
+
+/* Typedef for floating-point numbers that are converted
+   to fixed-point with a multiple of 100,000, e.g., int_gamma */
+typedef png_int_32 png_fixed_point;
+
+/* Add typedefs for pointers */
+typedef void            FAR * png_voidp;
+typedef png_byte        FAR * png_bytep;
+typedef png_uint_32     FAR * png_uint_32p;
+typedef png_int_32      FAR * png_int_32p;
+typedef png_uint_16     FAR * png_uint_16p;
+typedef png_int_16      FAR * png_int_16p;
+typedef PNG_CONST char  FAR * png_const_charp;
+typedef char            FAR * png_charp;
+typedef png_fixed_point FAR * png_fixed_point_p;
+
+#ifndef PNG_NO_STDIO
+#ifdef _WIN32_WCE
+typedef HANDLE                png_FILE_p;
+#else
+typedef FILE                * png_FILE_p;
+#endif
+#endif
+
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+typedef double          FAR * png_doublep;
+#endif
+
+/* Pointers to pointers; i.e. arrays */
+typedef png_byte        FAR * FAR * png_bytepp;
+typedef png_uint_32     FAR * FAR * png_uint_32pp;
+typedef png_int_32      FAR * FAR * png_int_32pp;
+typedef png_uint_16     FAR * FAR * png_uint_16pp;
+typedef png_int_16      FAR * FAR * png_int_16pp;
+typedef PNG_CONST char  FAR * FAR * png_const_charpp;
+typedef char            FAR * FAR * png_charpp;
+typedef png_fixed_point FAR * FAR * png_fixed_point_pp;
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+typedef double          FAR * FAR * png_doublepp;
+#endif
+
+/* Pointers to pointers to pointers; i.e., pointer to array */
+typedef char            FAR * FAR * FAR * png_charppp;
+
+#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
+/* SPC -  Is this stuff deprecated? */
+/* It'll be removed as of libpng-1.4.0 - GR-P */
+/* libpng typedefs for types in zlib. If zlib changes
+ * or another compression library is used, then change these.
+ * Eliminates need to change all the source files.
+ */
+typedef charf *         png_zcharp;
+typedef charf * FAR *   png_zcharpp;
+typedef z_stream FAR *  png_zstreamp;
+#endif /* (PNG_1_0_X) || defined(PNG_1_2_X) */
+
+/*
+ * Define PNG_BUILD_DLL if the module being built is a Windows
+ * LIBPNG DLL.
+ *
+ * Define PNG_USE_DLL if you want to *link* to the Windows LIBPNG DLL.
+ * It is equivalent to Microsoft predefined macro _DLL that is
+ * automatically defined when you compile using the share
+ * version of the CRT (C Run-Time library)
+ *
+ * The cygwin mods make this behavior a little different:
+ * Define PNG_BUILD_DLL if you are building a dll for use with cygwin
+ * Define PNG_STATIC if you are building a static library for use with cygwin,
+ *   -or- if you are building an application that you want to link to the
+ *   static library.
+ * PNG_USE_DLL is defined by default (no user action needed) unless one of
+ *   the other flags is defined.
+ */
+
+#if !defined(PNG_DLL) && (defined(PNG_BUILD_DLL) || defined(PNG_USE_DLL))
+#  define PNG_DLL
+#endif
+/* If CYGWIN, then disallow GLOBAL ARRAYS unless building a static lib.
+ * When building a static lib, default to no GLOBAL ARRAYS, but allow
+ * command-line override
+ */
+#ifdef __CYGWIN__
+#  ifndef PNG_STATIC
+#    ifdef PNG_USE_GLOBAL_ARRAYS
+#      undef PNG_USE_GLOBAL_ARRAYS
+#    endif
+#    ifndef PNG_USE_LOCAL_ARRAYS
+#      define PNG_USE_LOCAL_ARRAYS
+#    endif
+#  else
+#    if defined(PNG_USE_LOCAL_ARRAYS) || defined(PNG_NO_GLOBAL_ARRAYS)
+#      ifdef PNG_USE_GLOBAL_ARRAYS
+#        undef PNG_USE_GLOBAL_ARRAYS
+#      endif
+#    endif
+#  endif
+#  if !defined(PNG_USE_LOCAL_ARRAYS) && !defined(PNG_USE_GLOBAL_ARRAYS)
+#    define PNG_USE_LOCAL_ARRAYS
+#  endif
+#endif
+
+/* Do not use global arrays (helps with building DLL's)
+ * They are no longer used in libpng itself, since version 1.0.5c,
+ * but might be required for some pre-1.0.5c applications.
+ */
+#if !defined(PNG_USE_LOCAL_ARRAYS) && !defined(PNG_USE_GLOBAL_ARRAYS)
+#  if defined(PNG_NO_GLOBAL_ARRAYS) || \
+      (defined(__GNUC__) && defined(PNG_DLL)) || defined(_MSC_VER)
+#    define PNG_USE_LOCAL_ARRAYS
+#  else
+#    define PNG_USE_GLOBAL_ARRAYS
+#  endif
+#endif
+
+#ifdef __CYGWIN__
+#  undef PNGAPI
+#  define PNGAPI __cdecl
+#  undef PNG_IMPEXP
+#  define PNG_IMPEXP
+#endif
+
+/* If you define PNGAPI, e.g., with compiler option "-DPNGAPI=__stdcall",
+ * you may get warnings regarding the linkage of png_zalloc and png_zfree.
+ * Don't ignore those warnings; you must also reset the default calling
+ * convention in your compiler to match your PNGAPI, and you must build
+ * zlib and your applications the same way you build libpng.
+ */
+
+#if defined(__MINGW32__) && !defined(PNG_MODULEDEF)
+#  ifndef PNG_NO_MODULEDEF
+#    define PNG_NO_MODULEDEF
+#  endif
+#endif
+
+#if !defined(PNG_IMPEXP) && defined(PNG_BUILD_DLL) && !defined(PNG_NO_MODULEDEF)
+#  define PNG_IMPEXP
+#endif
+
+#if defined(PNG_DLL) || defined(_DLL) || defined(__DLL__ ) || \
+    (( defined(_Windows) || defined(_WINDOWS) || \
+       defined(WIN32) || defined(_WIN32) || defined(__WIN32__) ))
+
+#  ifndef PNGAPI
+#     if defined(__GNUC__) || (defined (_MSC_VER) && (_MSC_VER >= 800))
+#        define PNGAPI __cdecl
+#     else
+#        define PNGAPI _cdecl
+#     endif
+#  endif
+
+#  if !defined(PNG_IMPEXP) && (!defined(PNG_DLL) || \
+       0 /* WINCOMPILER_WITH_NO_SUPPORT_FOR_DECLIMPEXP */)
+#     define PNG_IMPEXP
+#  endif
+
+#  ifndef PNG_IMPEXP
+
+#     define PNG_EXPORT_TYPE1(type,symbol)  PNG_IMPEXP type PNGAPI symbol
+#     define PNG_EXPORT_TYPE2(type,symbol)  type PNG_IMPEXP PNGAPI symbol
+
+      /* Borland/Microsoft */
+#     if defined(_MSC_VER) || defined(__BORLANDC__)
+#        if (_MSC_VER >= 800) || (__BORLANDC__ >= 0x500)
+#           define PNG_EXPORT PNG_EXPORT_TYPE1
+#        else
+#           define PNG_EXPORT PNG_EXPORT_TYPE2
+#           ifdef PNG_BUILD_DLL
+#              define PNG_IMPEXP __export
+#           else
+#              define PNG_IMPEXP /*__import */ /* doesn't exist AFAIK in
+                                                 VC++ */
+#           endif                             /* Exists in Borland C++ for
+                                                 C++ classes (== huge) */
+#        endif
+#     endif
+
+#     ifndef PNG_IMPEXP
+#        ifdef PNG_BUILD_DLL
+#           define PNG_IMPEXP __declspec(dllexport)
+#        else
+#           define PNG_IMPEXP __declspec(dllimport)
+#        endif
+#     endif
+#  endif  /* PNG_IMPEXP */
+#else /* !(DLL || non-cygwin WINDOWS) */
+#   if (defined(__IBMC__) || defined(__IBMCPP__)) && defined(__OS2__)
+#      ifndef PNGAPI
+#         define PNGAPI _System
+#      endif
+#   else
+#      if 0 /* ... other platforms, with other meanings */
+#      endif
+#   endif
+#endif
+
+#ifndef PNGAPI
+#  define PNGAPI
+#endif
+#ifndef PNG_IMPEXP
+#  define PNG_IMPEXP
+#endif
+
+#ifdef PNG_BUILDSYMS
+#  ifndef PNG_EXPORT
+#    define PNG_EXPORT(type,symbol) PNG_FUNCTION_EXPORT symbol END
+#  endif
+#  ifdef PNG_USE_GLOBAL_ARRAYS
+#    ifndef PNG_EXPORT_VAR
+#      define PNG_EXPORT_VAR(type) PNG_DATA_EXPORT
+#    endif
+#  endif
+#endif
+
+#ifndef PNG_EXPORT
+#  define PNG_EXPORT(type,symbol) PNG_IMPEXP type PNGAPI symbol
+#endif
+
+#ifdef PNG_USE_GLOBAL_ARRAYS
+#  ifndef PNG_EXPORT_VAR
+#    define PNG_EXPORT_VAR(type) extern PNG_IMPEXP type
+#  endif
+#endif
+
+#ifdef PNG_PEDANTIC_WARNINGS
+#  ifndef PNG_PEDANTIC_WARNINGS_SUPPORTED
+#    define PNG_PEDANTIC_WARNINGS_SUPPORTED
+#  endif
+#endif
+
+#ifdef PNG_PEDANTIC_WARNINGS_SUPPORTED
+/* Support for compiler specific function attributes.  These are used
+ * so that where compiler support is available incorrect use of API
+ * functions in png.h will generate compiler warnings.  Added at libpng
+ * version 1.2.41.
+ */
+#  ifdef __GNUC__
+#    ifndef PNG_USE_RESULT
+#      define PNG_USE_RESULT __attribute__((__warn_unused_result__))
+#    endif
+#    ifndef PNG_NORETURN
+#      define PNG_NORETURN   __attribute__((__noreturn__))
+#    endif
+#    ifndef PNG_ALLOCATED
+#      define PNG_ALLOCATED  __attribute__((__malloc__))
+#    endif
+
+    /* This specifically protects structure members that should only be
+     * accessed from within the library, therefore should be empty during
+     * a library build.
+     */
+#    ifndef PNG_DEPRECATED
+#      define PNG_DEPRECATED __attribute__((__deprecated__))
+#    endif
+#    ifndef PNG_DEPSTRUCT
+#      define PNG_DEPSTRUCT  __attribute__((__deprecated__))
+#    endif
+#    ifndef PNG_PRIVATE
+#      if 0 /* Doesn't work so we use deprecated instead*/
+#        define PNG_PRIVATE \
+          __attribute__((warning("This function is not exported by libpng.")))
+#      else
+#        define PNG_PRIVATE \
+          __attribute__((__deprecated__))
+#      endif
+#    endif /* PNG_PRIVATE */
+#  endif /* __GNUC__ */
+#endif /* PNG_PEDANTIC_WARNINGS */
+
+#ifndef PNG_DEPRECATED
+#  define PNG_DEPRECATED  /* Use of this function is deprecated */
+#endif
+#ifndef PNG_USE_RESULT
+#  define PNG_USE_RESULT  /* The result of this function must be checked */
+#endif
+#ifndef PNG_NORETURN
+#  define PNG_NORETURN    /* This function does not return */
+#endif
+#ifndef PNG_ALLOCATED
+#  define PNG_ALLOCATED   /* The result of the function is new memory */
+#endif
+#ifndef PNG_DEPSTRUCT
+#  define PNG_DEPSTRUCT   /* Access to this struct member is deprecated */
+#endif
+#ifndef PNG_PRIVATE
+#  define PNG_PRIVATE     /* This is a private libpng function */
+#endif
+
+/* User may want to use these so they are not in PNG_INTERNAL. Any library
+ * functions that are passed far data must be model independent.
+ */
+
+#ifndef PNG_ABORT
+#  define PNG_ABORT() abort()
+#endif
+
+#ifdef PNG_SETJMP_SUPPORTED
+#  define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
+#else
+#  define png_jmpbuf(png_ptr) \
+   (LIBPNG_WAS_COMPILED_WITH__PNG_SETJMP_NOT_SUPPORTED)
+#endif
+
+#ifdef USE_FAR_KEYWORD  /* memory model independent fns */
+/* Use this to make far-to-near assignments */
+#  define CHECK   1
+#  define NOCHECK 0
+#  define CVT_PTR(ptr) (png_far_to_near(png_ptr,ptr,CHECK))
+#  define CVT_PTR_NOCHECK(ptr) (png_far_to_near(png_ptr,ptr,NOCHECK))
+#  define png_snprintf _fsnprintf   /* Added to v 1.2.19 */
+#  define png_strlen  _fstrlen
+#  define png_memcmp  _fmemcmp    /* SJT: added */
+#  define png_memcpy  _fmemcpy
+#  define png_memset  _fmemset
+#else /* Use the usual functions */
+#  define CVT_PTR(ptr)         (ptr)
+#  define CVT_PTR_NOCHECK(ptr) (ptr)
+#  ifndef PNG_NO_SNPRINTF
+#    ifdef _MSC_VER
+#      define png_snprintf _snprintf   /* Added to v 1.2.19 */
+#      define png_snprintf2 _snprintf
+#      define png_snprintf6 _snprintf
+#    else
+#      define png_snprintf snprintf   /* Added to v 1.2.19 */
+#      define png_snprintf2 snprintf
+#      define png_snprintf6 snprintf
+#    endif
+#  else
+     /* You don't have or don't want to use snprintf().  Caution: Using
+      * sprintf instead of snprintf exposes your application to accidental
+      * or malevolent buffer overflows.  If you don't have snprintf()
+      * as a general rule you should provide one (you can get one from
+      * Portable OpenSSH).
+      */
+#    define png_snprintf(s1,n,fmt,x1) sprintf(s1,fmt,x1)
+#    define png_snprintf2(s1,n,fmt,x1,x2) sprintf(s1,fmt,x1,x2)
+#    define png_snprintf6(s1,n,fmt,x1,x2,x3,x4,x5,x6) \
+        sprintf(s1,fmt,x1,x2,x3,x4,x5,x6)
+#  endif
+#  define png_strlen  strlen
+#  define png_memcmp  memcmp      /* SJT: added */
+#  define png_memcpy  memcpy
+#  define png_memset  memset
+#endif
+/* End of memory model independent support */
+
+/* Just a little check that someone hasn't tried to define something
+ * contradictory.
+ */
+#if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K)
+#  undef PNG_ZBUF_SIZE
+#  define PNG_ZBUF_SIZE 65536L
+#endif
+
+/* Added at libpng-1.2.8 */
+#endif /* PNG_VERSION_INFO_ONLY */
+
+#endif /* PNGCONF_H */
diff --git a/src/libpng/pngerror.c b/src/libpng/pngerror.c
new file mode 100644
index 0000000..025d52e
--- /dev/null
+++ b/src/libpng/pngerror.c
@@ -0,0 +1,396 @@
+
+/* pngerror.c - stub functions for i/o and memory allocation
+ *
+ * Last changed in libpng 1.2.45 [July 7, 2011]
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
+ * This file provides a location for all error handling.  Users who
+ * need special error handling are expected to write replacement functions
+ * and use png_set_error_fn() to use those functions.  See the instructions
+ * at each function.
+ */
+
+#define PNG_INTERNAL
+#define PNG_NO_PEDANTIC_WARNINGS
+#include "png.h"
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
+
+static void /* PRIVATE */
+png_default_error PNGARG((png_structp png_ptr,
+  png_const_charp error_message)) PNG_NORETURN;
+#ifdef PNG_WARNINGS_SUPPORTED
+static void /* PRIVATE */
+png_default_warning PNGARG((png_structp png_ptr,
+  png_const_charp warning_message));
+#endif /* PNG_WARNINGS_SUPPORTED */
+
+/* This function is called whenever there is a fatal error.  This function
+ * should not be changed.  If there is a need to handle errors differently,
+ * you should supply a replacement error function and use png_set_error_fn()
+ * to replace the error function at run-time.
+ */
+#ifdef PNG_ERROR_TEXT_SUPPORTED
+void PNGAPI
+png_error(png_structp png_ptr, png_const_charp error_message)
+{
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+   char msg[16];
+   if (png_ptr != NULL)
+   {
+     if (png_ptr->flags&
+       (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
+     {
+       if (*error_message == PNG_LITERAL_SHARP)
+       {
+           /* Strip "#nnnn " from beginning of error message. */
+           int offset;
+           for (offset = 1; offset<15; offset++)
+              if (error_message[offset] == ' ')
+                  break;
+           if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
+           {
+              int i;
+              for (i = 0; i < offset - 1; i++)
+                 msg[i] = error_message[i + 1];
+              msg[i - 1] = '\0';
+              error_message = msg;
+           }
+           else
+              error_message += offset;
+       }
+       else
+       {
+           if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
+           {
+              msg[0] = '0';
+              msg[1] = '\0';
+              error_message = msg;
+           }
+       }
+     }
+   }
+#endif
+   if (png_ptr != NULL && png_ptr->error_fn != NULL)
+      (*(png_ptr->error_fn))(png_ptr, error_message);
+
+   /* If the custom handler doesn't exist, or if it returns,
+      use the default handler, which will not return. */
+   png_default_error(png_ptr, error_message);
+}
+#else
+void PNGAPI
+png_err(png_structp png_ptr)
+{
+   /* Prior to 1.2.45 the error_fn received a NULL pointer, expressed
+    * erroneously as '\0', instead of the empty string "".  This was
+    * apparently an error, introduced in libpng-1.2.20, and png_default_error
+    * will crash in this case.
+    */
+   if (png_ptr != NULL && png_ptr->error_fn != NULL)
+      (*(png_ptr->error_fn))(png_ptr, "");
+
+   /* If the custom handler doesn't exist, or if it returns,
+      use the default handler, which will not return. */
+   png_default_error(png_ptr, "");
+}
+#endif /* PNG_ERROR_TEXT_SUPPORTED */
+
+#ifdef PNG_WARNINGS_SUPPORTED
+/* This function is called whenever there is a non-fatal error.  This function
+ * should not be changed.  If there is a need to handle warnings differently,
+ * you should supply a replacement warning function and use
+ * png_set_error_fn() to replace the warning function at run-time.
+ */
+void PNGAPI
+png_warning(png_structp png_ptr, png_const_charp warning_message)
+{
+   int offset = 0;
+   if (png_ptr != NULL)
+   {
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+   if (png_ptr->flags&
+     (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
+#endif
+     {
+       if (*warning_message == PNG_LITERAL_SHARP)
+       {
+           for (offset = 1; offset < 15; offset++)
+              if (warning_message[offset] == ' ')
+                  break;
+       }
+     }
+   }
+   if (png_ptr != NULL && png_ptr->warning_fn != NULL)
+      (*(png_ptr->warning_fn))(png_ptr, warning_message + offset);
+   else
+      png_default_warning(png_ptr, warning_message + offset);
+}
+#endif /* PNG_WARNINGS_SUPPORTED */
+
+#ifdef PNG_BENIGN_ERRORS_SUPPORTED
+void PNGAPI
+png_benign_error(png_structp png_ptr, png_const_charp error_message)
+{
+  if (png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN)
+    png_warning(png_ptr, error_message);
+  else
+    png_error(png_ptr, error_message);
+}
+#endif
+
+/* These utilities are used internally to build an error message that relates
+ * to the current chunk.  The chunk name comes from png_ptr->chunk_name,
+ * this is used to prefix the message.  The message is limited in length
+ * to 63 bytes, the name characters are output as hex digits wrapped in []
+ * if the character is invalid.
+ */
+#define isnonalpha(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97))
+static PNG_CONST char png_digit[16] = {
+   '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
+   'A', 'B', 'C', 'D', 'E', 'F'
+};
+
+#define PNG_MAX_ERROR_TEXT 64
+#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_ERROR_TEXT_SUPPORTED)
+static void /* PRIVATE */
+png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp
+   error_message)
+{
+   int iout = 0, iin = 0;
+
+   while (iin < 4)
+   {
+      int c = png_ptr->chunk_name[iin++];
+      if (isnonalpha(c))
+      {
+         buffer[iout++] = PNG_LITERAL_LEFT_SQUARE_BRACKET;
+         buffer[iout++] = png_digit[(c & 0xf0) >> 4];
+         buffer[iout++] = png_digit[c & 0x0f];
+         buffer[iout++] = PNG_LITERAL_RIGHT_SQUARE_BRACKET;
+      }
+      else
+      {
+         buffer[iout++] = (png_byte)c;
+      }
+   }
+
+   if (error_message == NULL)
+      buffer[iout] = '\0';
+   else
+   {
+      buffer[iout++] = ':';
+      buffer[iout++] = ' ';
+
+      iin = 0;
+      while (iin < PNG_MAX_ERROR_TEXT-1 && error_message[iin] != '\0')
+         buffer[iout++] = error_message[iin++];
+
+      /* iin < PNG_MAX_ERROR_TEXT, so the following is safe: */
+      buffer[iout] = '\0';
+   }
+}
+
+#ifdef PNG_READ_SUPPORTED
+void PNGAPI
+png_chunk_error(png_structp png_ptr, png_const_charp error_message)
+{
+   char msg[18+PNG_MAX_ERROR_TEXT];
+   if (png_ptr == NULL)
+     png_error(png_ptr, error_message);
+   else
+   {
+     png_format_buffer(png_ptr, msg, error_message);
+     png_error(png_ptr, msg);
+   }
+}
+#endif /* PNG_READ_SUPPORTED */
+#endif /* PNG_WARNINGS_SUPPORTED || PNG_ERROR_TEXT_SUPPORTED */
+
+#ifdef PNG_WARNINGS_SUPPORTED
+void PNGAPI
+png_chunk_warning(png_structp png_ptr, png_const_charp warning_message)
+{
+   char msg[18+PNG_MAX_ERROR_TEXT];
+   if (png_ptr == NULL)
+     png_warning(png_ptr, warning_message);
+   else
+   {
+     png_format_buffer(png_ptr, msg, warning_message);
+     png_warning(png_ptr, msg);
+   }
+}
+#endif /* PNG_WARNINGS_SUPPORTED */
+
+#ifdef PNG_READ_SUPPORTED
+#ifdef PNG_BENIGN_ERRORS_SUPPORTED
+void PNGAPI
+png_chunk_benign_error(png_structp png_ptr, png_const_charp error_message)
+{
+  if (png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN)
+    png_chunk_warning(png_ptr, error_message);
+  else
+    png_chunk_error(png_ptr, error_message);
+}
+#endif
+#endif /* PNG_READ_SUPPORTED */
+
+/* This is the default error handling function.  Note that replacements for
+ * this function MUST NOT RETURN, or the program will likely crash.  This
+ * function is used by default, or if the program supplies NULL for the
+ * error function pointer in png_set_error_fn().
+ */
+static void /* PRIVATE */
+png_default_error(png_structp png_ptr, png_const_charp error_message)
+{
+#ifdef PNG_CONSOLE_IO_SUPPORTED
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+   if (*error_message == PNG_LITERAL_SHARP)
+   {
+     /* Strip "#nnnn " from beginning of error message. */
+     int offset;
+     char error_number[16];
+     for (offset = 0; offset<15; offset++)
+     {
+         error_number[offset] = error_message[offset + 1];
+         if (error_message[offset] == ' ')
+             break;
+     }
+     if ((offset > 1) && (offset < 15))
+     {
+       error_number[offset - 1] = '\0';
+       fprintf(stderr, "libpng error no. %s: %s",
+          error_number, error_message + offset + 1);
+       fprintf(stderr, PNG_STRING_NEWLINE);
+     }
+     else
+     {
+       fprintf(stderr, "libpng error: %s, offset=%d",
+          error_message, offset);
+       fprintf(stderr, PNG_STRING_NEWLINE);
+     }
+   }
+   else
+#endif
+   {
+      fprintf(stderr, "libpng error: %s", error_message);
+      fprintf(stderr, PNG_STRING_NEWLINE);
+   }
+#endif
+
+#ifdef PNG_SETJMP_SUPPORTED
+   if (png_ptr)
+   {
+#  ifdef USE_FAR_KEYWORD
+   {
+      jmp_buf jmpbuf;
+      png_memcpy(jmpbuf, png_ptr->jmpbuf, png_sizeof(jmp_buf));
+     longjmp(jmpbuf,1);
+   }
+#  else
+   longjmp(png_ptr->jmpbuf, 1);
+#  endif
+   }
+#endif
+   /* Here if not setjmp support or if png_ptr is null. */
+   PNG_ABORT();
+#ifndef PNG_CONSOLE_IO_SUPPORTED
+   error_message = error_message; /* Make compiler happy */
+#endif
+}
+
+#ifdef PNG_WARNINGS_SUPPORTED
+/* This function is called when there is a warning, but the library thinks
+ * it can continue anyway.  Replacement functions don't have to do anything
+ * here if you don't want them to.  In the default configuration, png_ptr is
+ * not used, but it is passed in case it may be useful.
+ */
+static void /* PRIVATE */
+png_default_warning(png_structp png_ptr, png_const_charp warning_message)
+{
+#ifdef PNG_CONSOLE_IO_SUPPORTED
+#  ifdef PNG_ERROR_NUMBERS_SUPPORTED
+   if (*warning_message == PNG_LITERAL_SHARP)
+   {
+     int offset;
+     char warning_number[16];
+     for (offset = 0; offset < 15; offset++)
+     {
+        warning_number[offset] = warning_message[offset + 1];
+        if (warning_message[offset] == ' ')
+            break;
+     }
+     if ((offset > 1) && (offset < 15))
+     {
+       warning_number[offset + 1] = '\0';
+       fprintf(stderr, "libpng warning no. %s: %s",
+          warning_number, warning_message + offset);
+       fprintf(stderr, PNG_STRING_NEWLINE);
+     }
+     else
+     {
+       fprintf(stderr, "libpng warning: %s",
+          warning_message);
+       fprintf(stderr, PNG_STRING_NEWLINE);
+     }
+   }
+   else
+#  endif
+   {
+     fprintf(stderr, "libpng warning: %s", warning_message);
+     fprintf(stderr, PNG_STRING_NEWLINE);
+   }
+#else
+   warning_message = warning_message; /* Make compiler happy */
+#endif
+   png_ptr = png_ptr; /* Make compiler happy */
+}
+#endif /* PNG_WARNINGS_SUPPORTED */
+
+/* This function is called when the application wants to use another method
+ * of handling errors and warnings.  Note that the error function MUST NOT
+ * return to the calling routine or serious problems will occur.  The return
+ * method used in the default routine calls longjmp(png_ptr->jmpbuf, 1)
+ */
+void PNGAPI
+png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
+   png_error_ptr error_fn, png_error_ptr warning_fn)
+{
+   if (png_ptr == NULL)
+      return;
+   png_ptr->error_ptr = error_ptr;
+   png_ptr->error_fn = error_fn;
+   png_ptr->warning_fn = warning_fn;
+}
+
+
+/* This function returns a pointer to the error_ptr associated with the user
+ * functions.  The application should free any memory associated with this
+ * pointer before png_write_destroy and png_read_destroy are called.
+ */
+png_voidp PNGAPI
+png_get_error_ptr(png_structp png_ptr)
+{
+   if (png_ptr == NULL)
+      return NULL;
+   return ((png_voidp)png_ptr->error_ptr);
+}
+
+
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+void PNGAPI
+png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode)
+{
+   if (png_ptr != NULL)
+   {
+     png_ptr->flags &=
+       ((~(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode);
+   }
+}
+#endif
+#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
diff --git a/src/libpng/pnggccrd.c b/src/libpng/pnggccrd.c
new file mode 100644
index 0000000..78b8a7e
--- /dev/null
+++ b/src/libpng/pnggccrd.c
@@ -0,0 +1,103 @@
+/* pnggccrd.c was removed from libpng-1.2.20. */
+
+/* This code snippet is for use by configure's compilation test. */
+
+#if (!defined _MSC_VER) && \
+    defined(PNG_ASSEMBLER_CODE_SUPPORTED) && \
+    defined(PNG_MMX_CODE_SUPPORTED)
+
+int PNGAPI png_dummy_mmx_support(void);
+
+static int _mmx_supported = 2; // 0: no MMX; 1: MMX supported; 2: not tested
+
+int PNGAPI
+png_dummy_mmx_support(void) __attribute__((noinline));
+
+int PNGAPI
+png_dummy_mmx_support(void)
+{
+   int result;
+#ifdef PNG_MMX_CODE_SUPPORTED  // superfluous, but what the heck
+    __asm__ __volatile__ (
+#ifdef __x86_64__
+        "pushq %%rbx          \n\t"  // rbx gets clobbered by CPUID instruction
+        "pushq %%rcx          \n\t"  // so does rcx...
+        "pushq %%rdx          \n\t"  // ...and rdx (but rcx & rdx safe on Linux)
+        "pushfq               \n\t"  // save Eflag to stack
+        "popq %%rax           \n\t"  // get Eflag from stack into rax
+        "movq %%rax, %%rcx    \n\t"  // make another copy of Eflag in rcx
+        "xorl $0x200000, %%eax \n\t" // toggle ID bit in Eflag (i.e., bit 21)
+        "pushq %%rax          \n\t"  // save modified Eflag back to stack
+        "popfq                \n\t"  // restore modified value to Eflag reg
+        "pushfq               \n\t"  // save Eflag to stack
+        "popq %%rax           \n\t"  // get Eflag from stack
+        "pushq %%rcx          \n\t"  // save original Eflag to stack
+        "popfq                \n\t"  // restore original Eflag
+#else
+        "pushl %%ebx          \n\t"  // ebx gets clobbered by CPUID instruction
+        "pushl %%ecx          \n\t"  // so does ecx...
+        "pushl %%edx          \n\t"  // ...and edx (but ecx & edx safe on Linux)
+        "pushfl               \n\t"  // save Eflag to stack
+        "popl %%eax           \n\t"  // get Eflag from stack into eax
+        "movl %%eax, %%ecx    \n\t"  // make another copy of Eflag in ecx
+        "xorl $0x200000, %%eax \n\t" // toggle ID bit in Eflag (i.e., bit 21)
+        "pushl %%eax          \n\t"  // save modified Eflag back to stack
+        "popfl                \n\t"  // restore modified value to Eflag reg
+        "pushfl               \n\t"  // save Eflag to stack
+        "popl %%eax           \n\t"  // get Eflag from stack
+        "pushl %%ecx          \n\t"  // save original Eflag to stack
+        "popfl                \n\t"  // restore original Eflag
+#endif
+        "xorl %%ecx, %%eax    \n\t"  // compare new Eflag with original Eflag
+        "jz 0f                \n\t"  // if same, CPUID instr. is not supported
+
+        "xorl %%eax, %%eax    \n\t"  // set eax to zero
+//      ".byte  0x0f, 0xa2    \n\t"  // CPUID instruction (two-byte opcode)
+        "cpuid                \n\t"  // get the CPU identification info
+        "cmpl $1, %%eax       \n\t"  // make sure eax return non-zero value
+        "jl 0f                \n\t"  // if eax is zero, MMX is not supported
+
+        "xorl %%eax, %%eax    \n\t"  // set eax to zero and...
+        "incl %%eax           \n\t"  // ...increment eax to 1.  This pair is
+                                     // faster than the instruction "mov eax, 1"
+        "cpuid                \n\t"  // get the CPU identification info again
+        "andl $0x800000, %%edx \n\t" // mask out all bits but MMX bit (23)
+        "cmpl $0, %%edx       \n\t"  // 0 = MMX not supported
+        "jz 0f                \n\t"  // non-zero = yes, MMX IS supported
+
+        "movl $1, %%eax       \n\t"  // set return value to 1
+        "jmp  1f              \n\t"  // DONE:  have MMX support
+
+    "0:                       \n\t"  // .NOT_SUPPORTED: target label for jump instructions
+        "movl $0, %%eax       \n\t"  // set return value to 0
+    "1:                       \n\t"  // .RETURN: target label for jump instructions
+#ifdef __x86_64__
+        "popq %%rdx           \n\t"  // restore rdx
+        "popq %%rcx           \n\t"  // restore rcx
+        "popq %%rbx           \n\t"  // restore rbx
+#else
+        "popl %%edx           \n\t"  // restore edx
+        "popl %%ecx           \n\t"  // restore ecx
+        "popl %%ebx           \n\t"  // restore ebx
+#endif
+
+//      "ret                  \n\t"  // DONE:  no MMX support
+                                     // (fall through to standard C "ret")
+
+        : "=a" (result)              // output list
+
+        :                            // any variables used on input (none)
+
+                                     // no clobber list
+//      , "%ebx", "%ecx", "%edx"     // GRR:  we handle these manually
+//      , "memory"   // if write to a variable gcc thought was in a reg
+//      , "cc"       // "condition codes" (flag bits)
+    );
+    _mmx_supported = result;
+#else
+    _mmx_supported = 0;
+#endif /* PNG_MMX_CODE_SUPPORTED */
+
+    return _mmx_supported;
+}
+#endif
diff --git a/src/libpng/pngget.c b/src/libpng/pngget.c
new file mode 100644
index 0000000..d397329
--- /dev/null
+++ b/src/libpng/pngget.c
@@ -0,0 +1,944 @@
+
+/* pngget.c - retrieval of values from info struct
+ *
+ * Last changed in libpng 1.2.43 [February 25, 2010]
+ * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
+ */
+
+#define PNG_INTERNAL
+#define PNG_NO_PEDANTIC_WARNINGS
+#include "png.h"
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
+
+png_uint_32 PNGAPI
+png_get_valid(png_structp png_ptr, png_infop info_ptr, png_uint_32 flag)
+{
+   if (png_ptr != NULL && info_ptr != NULL)
+      return(info_ptr->valid & flag);
+
+   else
+      return(0);
+}
+
+png_uint_32 PNGAPI
+png_get_rowbytes(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr != NULL && info_ptr != NULL)
+      return(info_ptr->rowbytes);
+
+   else
+      return(0);
+}
+
+#ifdef PNG_INFO_IMAGE_SUPPORTED
+png_bytepp PNGAPI
+png_get_rows(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr != NULL && info_ptr != NULL)
+      return(info_ptr->row_pointers);
+
+   else
+      return(0);
+}
+#endif
+
+#ifdef PNG_EASY_ACCESS_SUPPORTED
+/* Easy access to info, added in libpng-0.99 */
+png_uint_32 PNGAPI
+png_get_image_width(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr != NULL && info_ptr != NULL)
+      return info_ptr->width;
+
+   return (0);
+}
+
+png_uint_32 PNGAPI
+png_get_image_height(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr != NULL && info_ptr != NULL)
+      return info_ptr->height;
+
+   return (0);
+}
+
+png_byte PNGAPI
+png_get_bit_depth(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr != NULL && info_ptr != NULL)
+      return info_ptr->bit_depth;
+
+   return (0);
+}
+
+png_byte PNGAPI
+png_get_color_type(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr != NULL && info_ptr != NULL)
+      return info_ptr->color_type;
+
+   return (0);
+}
+
+png_byte PNGAPI
+png_get_filter_type(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr != NULL && info_ptr != NULL)
+      return info_ptr->filter_type;
+
+   return (0);
+}
+
+png_byte PNGAPI
+png_get_interlace_type(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr != NULL && info_ptr != NULL)
+      return info_ptr->interlace_type;
+
+   return (0);
+}
+
+png_byte PNGAPI
+png_get_compression_type(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr != NULL && info_ptr != NULL)
+      return info_ptr->compression_type;
+
+   return (0);
+}
+
+png_uint_32 PNGAPI
+png_get_x_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr != NULL && info_ptr != NULL)
+#ifdef PNG_pHYs_SUPPORTED
+   if (info_ptr->valid & PNG_INFO_pHYs)
+   {
+      png_debug1(1, "in %s retrieval function", "png_get_x_pixels_per_meter");
+
+      if (info_ptr->phys_unit_type != PNG_RESOLUTION_METER)
+          return (0);
+
+      else
+          return (info_ptr->x_pixels_per_unit);
+   }
+#else
+   return (0);
+#endif
+   return (0);
+}
+
+png_uint_32 PNGAPI
+png_get_y_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr != NULL && info_ptr != NULL)
+#ifdef PNG_pHYs_SUPPORTED
+   if (info_ptr->valid & PNG_INFO_pHYs)
+   {
+      png_debug1(1, "in %s retrieval function", "png_get_y_pixels_per_meter");
+
+      if (info_ptr->phys_unit_type != PNG_RESOLUTION_METER)
+          return (0);
+
+      else
+          return (info_ptr->y_pixels_per_unit);
+   }
+#else
+   return (0);
+#endif
+   return (0);
+}
+
+png_uint_32 PNGAPI
+png_get_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr != NULL && info_ptr != NULL)
+#ifdef PNG_pHYs_SUPPORTED
+   if (info_ptr->valid & PNG_INFO_pHYs)
+   {
+      png_debug1(1, "in %s retrieval function", "png_get_pixels_per_meter");
+
+      if (info_ptr->phys_unit_type != PNG_RESOLUTION_METER ||
+         info_ptr->x_pixels_per_unit != info_ptr->y_pixels_per_unit)
+          return (0);
+
+      else
+          return (info_ptr->x_pixels_per_unit);
+   }
+#else
+   return (0);
+#endif
+   return (0);
+}
+
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+float PNGAPI
+png_get_pixel_aspect_ratio(png_structp png_ptr, png_infop info_ptr)
+   {
+   if (png_ptr != NULL && info_ptr != NULL)
+#ifdef PNG_pHYs_SUPPORTED
+
+   if (info_ptr->valid & PNG_INFO_pHYs)
+   {
+      png_debug1(1, "in %s retrieval function", "png_get_aspect_ratio");
+
+      if (info_ptr->x_pixels_per_unit == 0)
+         return ((float)0.0);
+
+      else
+         return ((float)((float)info_ptr->y_pixels_per_unit
+            /(float)info_ptr->x_pixels_per_unit));
+   }
+#else
+      return (0.0);
+#endif
+   return ((float)0.0);
+}
+#endif
+
+png_int_32 PNGAPI
+png_get_x_offset_microns(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr != NULL && info_ptr != NULL)
+#ifdef PNG_oFFs_SUPPORTED
+
+   if (info_ptr->valid & PNG_INFO_oFFs)
+   {
+      png_debug1(1, "in %s retrieval function", "png_get_x_offset_microns");
+
+      if (info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)
+          return (0);
+
+      else
+          return (info_ptr->x_offset);
+   }
+#else
+      return (0);
+#endif
+   return (0);
+}
+
+png_int_32 PNGAPI
+png_get_y_offset_microns(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr != NULL && info_ptr != NULL)
+
+#ifdef PNG_oFFs_SUPPORTED
+   if (info_ptr->valid & PNG_INFO_oFFs)
+   {
+      png_debug1(1, "in %s retrieval function", "png_get_y_offset_microns");
+
+      if (info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)
+          return (0);
+
+      else
+          return (info_ptr->y_offset);
+   }
+#else
+   return (0);
+#endif
+   return (0);
+}
+
+png_int_32 PNGAPI
+png_get_x_offset_pixels(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr != NULL && info_ptr != NULL)
+
+#ifdef PNG_oFFs_SUPPORTED
+   if (info_ptr->valid & PNG_INFO_oFFs)
+   {
+      png_debug1(1, "in %s retrieval function", "png_get_x_offset_microns");
+
+      if (info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)
+          return (0);
+
+      else
+          return (info_ptr->x_offset);
+   }
+#else
+   return (0);
+#endif
+   return (0);
+}
+
+png_int_32 PNGAPI
+png_get_y_offset_pixels(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr != NULL && info_ptr != NULL)
+
+#ifdef PNG_oFFs_SUPPORTED
+   if (info_ptr->valid & PNG_INFO_oFFs)
+   {
+      png_debug1(1, "in %s retrieval function", "png_get_y_offset_microns");
+
+      if (info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)
+          return (0);
+
+      else
+          return (info_ptr->y_offset);
+   }
+#else
+   return (0);
+#endif
+   return (0);
+}
+
+#if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
+png_uint_32 PNGAPI
+png_get_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
+{
+   return ((png_uint_32)((float)png_get_pixels_per_meter(png_ptr, info_ptr)
+     *.0254 +.5));
+}
+
+png_uint_32 PNGAPI
+png_get_x_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
+{
+   return ((png_uint_32)((float)png_get_x_pixels_per_meter(png_ptr, info_ptr)
+     *.0254 +.5));
+}
+
+png_uint_32 PNGAPI
+png_get_y_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
+{
+   return ((png_uint_32)((float)png_get_y_pixels_per_meter(png_ptr, info_ptr)
+     *.0254 +.5));
+}
+
+float PNGAPI
+png_get_x_offset_inches(png_structp png_ptr, png_infop info_ptr)
+{
+   return ((float)png_get_x_offset_microns(png_ptr, info_ptr)
+     *.00003937);
+}
+
+float PNGAPI
+png_get_y_offset_inches(png_structp png_ptr, png_infop info_ptr)
+{
+   return ((float)png_get_y_offset_microns(png_ptr, info_ptr)
+     *.00003937);
+}
+
+#ifdef PNG_pHYs_SUPPORTED
+png_uint_32 PNGAPI
+png_get_pHYs_dpi(png_structp png_ptr, png_infop info_ptr,
+   png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
+{
+   png_uint_32 retval = 0;
+
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
+   {
+      png_debug1(1, "in %s retrieval function", "pHYs");
+
+      if (res_x != NULL)
+      {
+         *res_x = info_ptr->x_pixels_per_unit;
+         retval |= PNG_INFO_pHYs;
+      }
+      if (res_y != NULL)
+      {
+         *res_y = info_ptr->y_pixels_per_unit;
+         retval |= PNG_INFO_pHYs;
+      }
+      if (unit_type != NULL)
+      {
+         *unit_type = (int)info_ptr->phys_unit_type;
+         retval |= PNG_INFO_pHYs;
+         if (*unit_type == 1)
+         {
+            if (res_x != NULL) *res_x = (png_uint_32)(*res_x * .0254 + .50);
+            if (res_y != NULL) *res_y = (png_uint_32)(*res_y * .0254 + .50);
+         }
+      }
+   }
+   return (retval);
+}
+#endif /* PNG_pHYs_SUPPORTED */
+#endif  /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
+
+/* png_get_channels really belongs in here, too, but it's been around longer */
+
+#endif  /* PNG_EASY_ACCESS_SUPPORTED */
+
+png_byte PNGAPI
+png_get_channels(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr != NULL && info_ptr != NULL)
+      return(info_ptr->channels);
+   else
+      return (0);
+}
+
+png_bytep PNGAPI
+png_get_signature(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr != NULL && info_ptr != NULL)
+      return(info_ptr->signature);
+   else
+      return (NULL);
+}
+
+#ifdef PNG_bKGD_SUPPORTED
+png_uint_32 PNGAPI
+png_get_bKGD(png_structp png_ptr, png_infop info_ptr,
+   png_color_16p *background)
+{
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD)
+      && background != NULL)
+   {
+      png_debug1(1, "in %s retrieval function", "bKGD");
+
+      *background = &(info_ptr->background);
+      return (PNG_INFO_bKGD);
+   }
+   return (0);
+}
+#endif
+
+#ifdef PNG_cHRM_SUPPORTED
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+png_uint_32 PNGAPI
+png_get_cHRM(png_structp png_ptr, png_infop info_ptr,
+   double *white_x, double *white_y, double *red_x, double *red_y,
+   double *green_x, double *green_y, double *blue_x, double *blue_y)
+{
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))
+   {
+      png_debug1(1, "in %s retrieval function", "cHRM");
+
+      if (white_x != NULL)
+         *white_x = (double)info_ptr->x_white;
+      if (white_y != NULL)
+         *white_y = (double)info_ptr->y_white;
+      if (red_x != NULL)
+         *red_x = (double)info_ptr->x_red;
+      if (red_y != NULL)
+         *red_y = (double)info_ptr->y_red;
+      if (green_x != NULL)
+         *green_x = (double)info_ptr->x_green;
+      if (green_y != NULL)
+         *green_y = (double)info_ptr->y_green;
+      if (blue_x != NULL)
+         *blue_x = (double)info_ptr->x_blue;
+      if (blue_y != NULL)
+         *blue_y = (double)info_ptr->y_blue;
+      return (PNG_INFO_cHRM);
+   }
+   return (0);
+}
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+png_uint_32 PNGAPI
+png_get_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
+   png_fixed_point *white_x, png_fixed_point *white_y, png_fixed_point *red_x,
+   png_fixed_point *red_y, png_fixed_point *green_x, png_fixed_point *green_y,
+   png_fixed_point *blue_x, png_fixed_point *blue_y)
+{
+   png_debug1(1, "in %s retrieval function", "cHRM");
+
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))
+   {
+      if (white_x != NULL)
+         *white_x = info_ptr->int_x_white;
+      if (white_y != NULL)
+         *white_y = info_ptr->int_y_white;
+      if (red_x != NULL)
+         *red_x = info_ptr->int_x_red;
+      if (red_y != NULL)
+         *red_y = info_ptr->int_y_red;
+      if (green_x != NULL)
+         *green_x = info_ptr->int_x_green;
+      if (green_y != NULL)
+         *green_y = info_ptr->int_y_green;
+      if (blue_x != NULL)
+         *blue_x = info_ptr->int_x_blue;
+      if (blue_y != NULL)
+         *blue_y = info_ptr->int_y_blue;
+      return (PNG_INFO_cHRM);
+   }
+   return (0);
+}
+#endif
+#endif
+
+#ifdef PNG_gAMA_SUPPORTED
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+png_uint_32 PNGAPI
+png_get_gAMA(png_structp png_ptr, png_infop info_ptr, double *file_gamma)
+{
+   png_debug1(1, "in %s retrieval function", "gAMA");
+
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
+      && file_gamma != NULL)
+   {
+      *file_gamma = (double)info_ptr->gamma;
+      return (PNG_INFO_gAMA);
+   }
+   return (0);
+}
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+png_uint_32 PNGAPI
+png_get_gAMA_fixed(png_structp png_ptr, png_infop info_ptr,
+    png_fixed_point *int_file_gamma)
+{
+   png_debug1(1, "in %s retrieval function", "gAMA");
+
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
+      && int_file_gamma != NULL)
+   {
+      *int_file_gamma = info_ptr->int_gamma;
+      return (PNG_INFO_gAMA);
+   }
+   return (0);
+}
+#endif
+#endif
+
+#ifdef PNG_sRGB_SUPPORTED
+png_uint_32 PNGAPI
+png_get_sRGB(png_structp png_ptr, png_infop info_ptr, int *file_srgb_intent)
+{
+   png_debug1(1, "in %s retrieval function", "sRGB");
+
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB)
+      && file_srgb_intent != NULL)
+   {
+      *file_srgb_intent = (int)info_ptr->srgb_intent;
+      return (PNG_INFO_sRGB);
+   }
+   return (0);
+}
+#endif
+
+#ifdef PNG_iCCP_SUPPORTED
+png_uint_32 PNGAPI
+png_get_iCCP(png_structp png_ptr, png_infop info_ptr,
+             png_charpp name, int *compression_type,
+             png_charpp profile, png_uint_32 *proflen)
+{
+   png_debug1(1, "in %s retrieval function", "iCCP");
+
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_iCCP)
+      && name != NULL && profile != NULL && proflen != NULL)
+   {
+      *name = info_ptr->iccp_name;
+      *profile = info_ptr->iccp_profile;
+      /* Compression_type is a dummy so the API won't have to change
+       * if we introduce multiple compression types later.
+       */
+      *proflen = (int)info_ptr->iccp_proflen;
+      *compression_type = (int)info_ptr->iccp_compression;
+      return (PNG_INFO_iCCP);
+   }
+   return (0);
+}
+#endif
+
+#ifdef PNG_sPLT_SUPPORTED
+png_uint_32 PNGAPI
+png_get_sPLT(png_structp png_ptr, png_infop info_ptr,
+             png_sPLT_tpp spalettes)
+{
+   if (png_ptr != NULL && info_ptr != NULL && spalettes != NULL)
+   {
+     *spalettes = info_ptr->splt_palettes;
+     return ((png_uint_32)info_ptr->splt_palettes_num);
+   }
+   return (0);
+}
+#endif
+
+#ifdef PNG_hIST_SUPPORTED
+png_uint_32 PNGAPI
+png_get_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p *hist)
+{
+   png_debug1(1, "in %s retrieval function", "hIST");
+
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST)
+      && hist != NULL)
+   {
+      *hist = info_ptr->hist;
+      return (PNG_INFO_hIST);
+   }
+   return (0);
+}
+#endif
+
+png_uint_32 PNGAPI
+png_get_IHDR(png_structp png_ptr, png_infop info_ptr,
+   png_uint_32 *width, png_uint_32 *height, int *bit_depth,
+   int *color_type, int *interlace_type, int *compression_type,
+   int *filter_type)
+
+{
+   png_debug1(1, "in %s retrieval function", "IHDR");
+
+   if (png_ptr == NULL || info_ptr == NULL || width == NULL ||
+       height == NULL || bit_depth == NULL || color_type == NULL)
+      return (0);
+
+   *width = info_ptr->width;
+   *height = info_ptr->height;
+   *bit_depth = info_ptr->bit_depth;
+   *color_type = info_ptr->color_type;
+
+   if (compression_type != NULL)
+      *compression_type = info_ptr->compression_type;
+
+   if (filter_type != NULL)
+      *filter_type = info_ptr->filter_type;
+
+   if (interlace_type != NULL)
+      *interlace_type = info_ptr->interlace_type;
+
+   /* This is redundant if we can be sure that the info_ptr values were all
+    * assigned in png_set_IHDR().  We do the check anyhow in case an
+    * application has ignored our advice not to mess with the members
+    * of info_ptr directly.
+    */
+   png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height,
+       info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,
+       info_ptr->compression_type, info_ptr->filter_type);
+
+   return (1);
+}
+
+#ifdef PNG_oFFs_SUPPORTED
+png_uint_32 PNGAPI
+png_get_oFFs(png_structp png_ptr, png_infop info_ptr,
+   png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type)
+{
+   png_debug1(1, "in %s retrieval function", "oFFs");
+
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)
+      && offset_x != NULL && offset_y != NULL && unit_type != NULL)
+   {
+      *offset_x = info_ptr->x_offset;
+      *offset_y = info_ptr->y_offset;
+      *unit_type = (int)info_ptr->offset_unit_type;
+      return (PNG_INFO_oFFs);
+   }
+   return (0);
+}
+#endif
+
+#ifdef PNG_pCAL_SUPPORTED
+png_uint_32 PNGAPI
+png_get_pCAL(png_structp png_ptr, png_infop info_ptr,
+   png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams,
+   png_charp *units, png_charpp *params)
+{
+   png_debug1(1, "in %s retrieval function", "pCAL");
+
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL)
+       && purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&
+       nparams != NULL && units != NULL && params != NULL)
+   {
+      *purpose = info_ptr->pcal_purpose;
+      *X0 = info_ptr->pcal_X0;
+      *X1 = info_ptr->pcal_X1;
+      *type = (int)info_ptr->pcal_type;
+      *nparams = (int)info_ptr->pcal_nparams;
+      *units = info_ptr->pcal_units;
+      *params = info_ptr->pcal_params;
+      return (PNG_INFO_pCAL);
+   }
+   return (0);
+}
+#endif
+
+#ifdef PNG_sCAL_SUPPORTED
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+png_uint_32 PNGAPI
+png_get_sCAL(png_structp png_ptr, png_infop info_ptr,
+             int *unit, double *width, double *height)
+{
+    if (png_ptr != NULL && info_ptr != NULL &&
+        (info_ptr->valid & PNG_INFO_sCAL))
+    {
+        *unit = info_ptr->scal_unit;
+        *width = info_ptr->scal_pixel_width;
+        *height = info_ptr->scal_pixel_height;
+        return (PNG_INFO_sCAL);
+    }
+    return(0);
+}
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+png_uint_32 PNGAPI
+png_get_sCAL_s(png_structp png_ptr, png_infop info_ptr,
+             int *unit, png_charpp width, png_charpp height)
+{
+    if (png_ptr != NULL && info_ptr != NULL &&
+        (info_ptr->valid & PNG_INFO_sCAL))
+    {
+        *unit = info_ptr->scal_unit;
+        *width = info_ptr->scal_s_width;
+        *height = info_ptr->scal_s_height;
+        return (PNG_INFO_sCAL);
+    }
+    return(0);
+}
+#endif
+#endif
+#endif
+
+#ifdef PNG_pHYs_SUPPORTED
+png_uint_32 PNGAPI
+png_get_pHYs(png_structp png_ptr, png_infop info_ptr,
+   png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
+{
+   png_uint_32 retval = 0;
+
+   png_debug1(1, "in %s retrieval function", "pHYs");
+
+   if (png_ptr != NULL && info_ptr != NULL &&
+      (info_ptr->valid & PNG_INFO_pHYs))
+   {
+      if (res_x != NULL)
+      {
+         *res_x = info_ptr->x_pixels_per_unit;
+         retval |= PNG_INFO_pHYs;
+      }
+
+      if (res_y != NULL)
+      {
+         *res_y = info_ptr->y_pixels_per_unit;
+         retval |= PNG_INFO_pHYs;
+      }
+
+      if (unit_type != NULL)
+      {
+         *unit_type = (int)info_ptr->phys_unit_type;
+         retval |= PNG_INFO_pHYs;
+      }
+   }
+   return (retval);
+}
+#endif
+
+png_uint_32 PNGAPI
+png_get_PLTE(png_structp png_ptr, png_infop info_ptr, png_colorp *palette,
+   int *num_palette)
+{
+   png_debug1(1, "in %s retrieval function", "PLTE");
+
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_PLTE)
+       && palette != NULL)
+   {
+      *palette = info_ptr->palette;
+      *num_palette = info_ptr->num_palette;
+      png_debug1(3, "num_palette = %d", *num_palette);
+      return (PNG_INFO_PLTE);
+   }
+   return (0);
+}
+
+#ifdef PNG_sBIT_SUPPORTED
+png_uint_32 PNGAPI
+png_get_sBIT(png_structp png_ptr, png_infop info_ptr, png_color_8p *sig_bit)
+{
+   png_debug1(1, "in %s retrieval function", "sBIT");
+
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT)
+      && sig_bit != NULL)
+   {
+      *sig_bit = &(info_ptr->sig_bit);
+      return (PNG_INFO_sBIT);
+   }
+   return (0);
+}
+#endif
+
+#ifdef PNG_TEXT_SUPPORTED
+png_uint_32 PNGAPI
+png_get_text(png_structp png_ptr, png_infop info_ptr, png_textp *text_ptr,
+   int *num_text)
+{
+   if (png_ptr != NULL && info_ptr != NULL && info_ptr->num_text > 0)
+   {
+      png_debug1(1, "in %s retrieval function",
+         (png_ptr->chunk_name[0] == '\0' ? "text"
+             : (png_const_charp)png_ptr->chunk_name));
+
+      if (text_ptr != NULL)
+         *text_ptr = info_ptr->text;
+
+      if (num_text != NULL)
+         *num_text = info_ptr->num_text;
+
+      return ((png_uint_32)info_ptr->num_text);
+   }
+   if (num_text != NULL)
+     *num_text = 0;
+   return(0);
+}
+#endif
+
+#ifdef PNG_tIME_SUPPORTED
+png_uint_32 PNGAPI
+png_get_tIME(png_structp png_ptr, png_infop info_ptr, png_timep *mod_time)
+{
+   png_debug1(1, "in %s retrieval function", "tIME");
+
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME)
+       && mod_time != NULL)
+   {
+      *mod_time = &(info_ptr->mod_time);
+      return (PNG_INFO_tIME);
+   }
+   return (0);
+}
+#endif
+
+#ifdef PNG_tRNS_SUPPORTED
+png_uint_32 PNGAPI
+png_get_tRNS(png_structp png_ptr, png_infop info_ptr,
+   png_bytep *trans, int *num_trans, png_color_16p *trans_values)
+{
+   png_uint_32 retval = 0;
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
+   {
+      png_debug1(1, "in %s retrieval function", "tRNS");
+
+      if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
+      {
+          if (trans != NULL)
+          {
+             *trans = info_ptr->trans;
+             retval |= PNG_INFO_tRNS;
+          }
+
+          if (trans_values != NULL)
+             *trans_values = &(info_ptr->trans_values);
+      }
+      else /* if (info_ptr->color_type != PNG_COLOR_TYPE_PALETTE) */
+      {
+          if (trans_values != NULL)
+          {
+             *trans_values = &(info_ptr->trans_values);
+             retval |= PNG_INFO_tRNS;
+          }
+
+          if (trans != NULL)
+             *trans = NULL;
+      }
+      if (num_trans != NULL)
+      {
+         *num_trans = info_ptr->num_trans;
+         retval |= PNG_INFO_tRNS;
+      }
+   }
+   return (retval);
+}
+#endif
+
+#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
+png_uint_32 PNGAPI
+png_get_unknown_chunks(png_structp png_ptr, png_infop info_ptr,
+             png_unknown_chunkpp unknowns)
+{
+   if (png_ptr != NULL && info_ptr != NULL && unknowns != NULL)
+   {
+     *unknowns = info_ptr->unknown_chunks;
+     return ((png_uint_32)info_ptr->unknown_chunks_num);
+   }
+   return (0);
+}
+#endif
+
+#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
+png_byte PNGAPI
+png_get_rgb_to_gray_status (png_structp png_ptr)
+{
+   return (png_byte)(png_ptr? png_ptr->rgb_to_gray_status : 0);
+}
+#endif
+
+#ifdef PNG_USER_CHUNKS_SUPPORTED
+png_voidp PNGAPI
+png_get_user_chunk_ptr(png_structp png_ptr)
+{
+   return (png_ptr? png_ptr->user_chunk_ptr : NULL);
+}
+#endif
+
+png_uint_32 PNGAPI
+png_get_compression_buffer_size(png_structp png_ptr)
+{
+   return (png_uint_32)(png_ptr? png_ptr->zbuf_size : 0L);
+}
+
+#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
+#ifndef PNG_1_0_X
+/* This function was added to libpng 1.2.0 and should exist by default */
+png_uint_32 PNGAPI
+png_get_asm_flags (png_structp png_ptr)
+{
+    /* Obsolete, to be removed from libpng-1.4.0 */
+    return (png_ptr? 0L: 0L);
+}
+
+/* This function was added to libpng 1.2.0 and should exist by default */
+png_uint_32 PNGAPI
+png_get_asm_flagmask (int flag_select)
+{
+    /* Obsolete, to be removed from libpng-1.4.0 */
+    flag_select=flag_select;
+    return 0L;
+}
+
+    /* GRR:  could add this:   && defined(PNG_MMX_CODE_SUPPORTED) */
+/* This function was added to libpng 1.2.0 */
+png_uint_32 PNGAPI
+png_get_mmx_flagmask (int flag_select, int *compilerID)
+{
+    /* Obsolete, to be removed from libpng-1.4.0 */
+    flag_select=flag_select;
+    *compilerID = -1;   /* unknown (i.e., no asm/MMX code compiled) */
+    return 0L;
+}
+
+/* This function was added to libpng 1.2.0 */
+png_byte PNGAPI
+png_get_mmx_bitdepth_threshold (png_structp png_ptr)
+{
+    /* Obsolete, to be removed from libpng-1.4.0 */
+    return (png_ptr? 0: 0);
+}
+
+/* This function was added to libpng 1.2.0 */
+png_uint_32 PNGAPI
+png_get_mmx_rowbytes_threshold (png_structp png_ptr)
+{
+    /* Obsolete, to be removed from libpng-1.4.0 */
+    return (png_ptr? 0L: 0L);
+}
+#endif /* ?PNG_1_0_X */
+#endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
+
+#ifdef PNG_SET_USER_LIMITS_SUPPORTED
+/* These functions were added to libpng 1.2.6 but not enabled
+* by default. They will be enabled in libpng-1.4.0 */
+png_uint_32 PNGAPI
+png_get_user_width_max (png_structp png_ptr)
+{
+    return (png_ptr? png_ptr->user_width_max : 0);
+}
+png_uint_32 PNGAPI
+png_get_user_height_max (png_structp png_ptr)
+{
+    return (png_ptr? png_ptr->user_height_max : 0);
+}
+#endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
+
+#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
diff --git a/src/libpng/pngmem.c b/src/libpng/pngmem.c
new file mode 100644
index 0000000..a18719b
--- /dev/null
+++ b/src/libpng/pngmem.c
@@ -0,0 +1,641 @@
+
+/* pngmem.c - stub functions for memory allocation
+ *
+ * Last changed in libpng 1.2.41 [February 25, 2010]
+ * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
+ * This file provides a location for all memory allocation.  Users who
+ * need special memory handling are expected to supply replacement
+ * functions for png_malloc() and png_free(), and to use
+ * png_create_read_struct_2() and png_create_write_struct_2() to
+ * identify the replacement functions.
+ */
+
+#define PNG_INTERNAL
+#define PNG_NO_PEDANTIC_WARNINGS
+#include "png.h"
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
+
+/* Borland DOS special memory handler */
+#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
+/* If you change this, be sure to change the one in png.h also */
+
+/* Allocate memory for a png_struct.  The malloc and memset can be replaced
+   by a single call to calloc() if this is thought to improve performance. */
+png_voidp /* PRIVATE */
+png_create_struct(int type)
+{
+#ifdef PNG_USER_MEM_SUPPORTED
+   return (png_create_struct_2(type, png_malloc_ptr_NULL, png_voidp_NULL));
+}
+
+/* Alternate version of png_create_struct, for use with user-defined malloc. */
+png_voidp /* PRIVATE */
+png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
+{
+#endif /* PNG_USER_MEM_SUPPORTED */
+   png_size_t size;
+   png_voidp struct_ptr;
+
+   if (type == PNG_STRUCT_INFO)
+      size = png_sizeof(png_info);
+   else if (type == PNG_STRUCT_PNG)
+      size = png_sizeof(png_struct);
+   else
+      return (png_get_copyright(NULL));
+
+#ifdef PNG_USER_MEM_SUPPORTED
+   if (malloc_fn != NULL)
+   {
+      png_struct dummy_struct;
+      png_structp png_ptr = &dummy_struct;
+      png_ptr->mem_ptr=mem_ptr;
+      struct_ptr = (*(malloc_fn))(png_ptr, (png_uint_32)size);
+   }
+   else
+#endif /* PNG_USER_MEM_SUPPORTED */
+   struct_ptr = (png_voidp)farmalloc(size);
+   if (struct_ptr != NULL)
+      png_memset(struct_ptr, 0, size);
+   return (struct_ptr);
+}
+
+/* Free memory allocated by a png_create_struct() call */
+void /* PRIVATE */
+png_destroy_struct(png_voidp struct_ptr)
+{
+#ifdef PNG_USER_MEM_SUPPORTED
+   png_destroy_struct_2(struct_ptr, png_free_ptr_NULL, png_voidp_NULL);
+}
+
+/* Free memory allocated by a png_create_struct() call */
+void /* PRIVATE */
+png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
+    png_voidp mem_ptr)
+{
+#endif
+   if (struct_ptr != NULL)
+   {
+#ifdef PNG_USER_MEM_SUPPORTED
+      if (free_fn != NULL)
+      {
+         png_struct dummy_struct;
+         png_structp png_ptr = &dummy_struct;
+         png_ptr->mem_ptr=mem_ptr;
+         (*(free_fn))(png_ptr, struct_ptr);
+         return;
+      }
+#endif /* PNG_USER_MEM_SUPPORTED */
+      farfree (struct_ptr);
+   }
+}
+
+/* Allocate memory.  For reasonable files, size should never exceed
+ * 64K.  However, zlib may allocate more then 64K if you don't tell
+ * it not to.  See zconf.h and png.h for more information. zlib does
+ * need to allocate exactly 64K, so whatever you call here must
+ * have the ability to do that.
+ *
+ * Borland seems to have a problem in DOS mode for exactly 64K.
+ * It gives you a segment with an offset of 8 (perhaps to store its
+ * memory stuff).  zlib doesn't like this at all, so we have to
+ * detect and deal with it.  This code should not be needed in
+ * Windows or OS/2 modes, and only in 16 bit mode.  This code has
+ * been updated by Alexander Lehmann for version 0.89 to waste less
+ * memory.
+ *
+ * Note that we can't use png_size_t for the "size" declaration,
+ * since on some systems a png_size_t is a 16-bit quantity, and as a
+ * result, we would be truncating potentially larger memory requests
+ * (which should cause a fatal error) and introducing major problems.
+ */
+png_voidp /* PRIVATE */
+png_calloc(png_structp png_ptr, png_uint_32 size)
+{
+   png_voidp ret;
+
+   ret = (png_malloc(png_ptr, size));
+   if (ret != NULL)
+      png_memset(ret,0,(png_size_t)size);
+   return (ret);
+}
+
+png_voidp PNGAPI
+png_malloc(png_structp png_ptr, png_uint_32 size)
+{
+   png_voidp ret;
+
+   if (png_ptr == NULL || size == 0)
+      return (NULL);
+
+#ifdef PNG_USER_MEM_SUPPORTED
+   if (png_ptr->malloc_fn != NULL)
+      ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
+   else
+      ret = (png_malloc_default(png_ptr, size));
+   if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+       png_error(png_ptr, "Out of memory!");
+   return (ret);
+}
+
+png_voidp PNGAPI
+png_malloc_default(png_structp png_ptr, png_uint_32 size)
+{
+   png_voidp ret;
+#endif /* PNG_USER_MEM_SUPPORTED */
+
+   if (png_ptr == NULL || size == 0)
+      return (NULL);
+
+#ifdef PNG_MAX_MALLOC_64K
+   if (size > (png_uint_32)65536L)
+   {
+      png_warning(png_ptr, "Cannot Allocate > 64K");
+      ret = NULL;
+   }
+   else
+#endif
+
+   if (size != (size_t)size)
+      ret = NULL;
+   else if (size == (png_uint_32)65536L)
+   {
+      if (png_ptr->offset_table == NULL)
+      {
+         /* Try to see if we need to do any of this fancy stuff */
+         ret = farmalloc(size);
+         if (ret == NULL || ((png_size_t)ret & 0xffff))
+         {
+            int num_blocks;
+            png_uint_32 total_size;
+            png_bytep table;
+            int i;
+            png_byte huge * hptr;
+
+            if (ret != NULL)
+            {
+               farfree(ret);
+               ret = NULL;
+            }
+
+            if (png_ptr->zlib_window_bits > 14)
+               num_blocks = (int)(1 << (png_ptr->zlib_window_bits - 14));
+            else
+               num_blocks = 1;
+            if (png_ptr->zlib_mem_level >= 7)
+               num_blocks += (int)(1 << (png_ptr->zlib_mem_level - 7));
+            else
+               num_blocks++;
+
+            total_size = ((png_uint_32)65536L) * (png_uint_32)num_blocks+16;
+
+            table = farmalloc(total_size);
+
+            if (table == NULL)
+            {
+#ifndef PNG_USER_MEM_SUPPORTED
+               if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+                  png_error(png_ptr, "Out Of Memory."); /* Note "O", "M" */
+               else
+                  png_warning(png_ptr, "Out Of Memory.");
+#endif
+               return (NULL);
+            }
+
+            if ((png_size_t)table & 0xfff0)
+            {
+#ifndef PNG_USER_MEM_SUPPORTED
+               if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+                  png_error(png_ptr,
+                    "Farmalloc didn't return normalized pointer");
+               else
+                  png_warning(png_ptr,
+                    "Farmalloc didn't return normalized pointer");
+#endif
+               return (NULL);
+            }
+
+            png_ptr->offset_table = table;
+            png_ptr->offset_table_ptr = farmalloc(num_blocks *
+               png_sizeof(png_bytep));
+
+            if (png_ptr->offset_table_ptr == NULL)
+            {
+#ifndef PNG_USER_MEM_SUPPORTED
+               if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+                  png_error(png_ptr, "Out Of memory."); /* Note "O", "m" */
+               else
+                  png_warning(png_ptr, "Out Of memory.");
+#endif
+               return (NULL);
+            }
+
+            hptr = (png_byte huge *)table;
+            if ((png_size_t)hptr & 0xf)
+            {
+               hptr = (png_byte huge *)((long)(hptr) & 0xfffffff0L);
+               hptr = hptr + 16L;  /* "hptr += 16L" fails on Turbo C++ 3.0 */
+            }
+            for (i = 0; i < num_blocks; i++)
+            {
+               png_ptr->offset_table_ptr[i] = (png_bytep)hptr;
+               hptr = hptr + (png_uint_32)65536L;  /* "+=" fails on TC++3.0 */
+            }
+
+            png_ptr->offset_table_number = num_blocks;
+            png_ptr->offset_table_count = 0;
+            png_ptr->offset_table_count_free = 0;
+         }
+      }
+
+      if (png_ptr->offset_table_count >= png_ptr->offset_table_number)
+      {
+#ifndef PNG_USER_MEM_SUPPORTED
+         if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+            png_error(png_ptr, "Out of Memory."); /* Note "o" and "M" */
+         else
+            png_warning(png_ptr, "Out of Memory.");
+#endif
+         return (NULL);
+      }
+
+      ret = png_ptr->offset_table_ptr[png_ptr->offset_table_count++];
+   }
+   else
+      ret = farmalloc(size);
+
+#ifndef PNG_USER_MEM_SUPPORTED
+   if (ret == NULL)
+   {
+      if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+         png_error(png_ptr, "Out of memory."); /* Note "o" and "m" */
+      else
+         png_warning(png_ptr, "Out of memory."); /* Note "o" and "m" */
+   }
+#endif
+
+   return (ret);
+}
+
+/* Free a pointer allocated by png_malloc().  In the default
+ * configuration, png_ptr is not used, but is passed in case it
+ * is needed.  If ptr is NULL, return without taking any action.
+ */
+void PNGAPI
+png_free(png_structp png_ptr, png_voidp ptr)
+{
+   if (png_ptr == NULL || ptr == NULL)
+      return;
+
+#ifdef PNG_USER_MEM_SUPPORTED
+   if (png_ptr->free_fn != NULL)
+   {
+      (*(png_ptr->free_fn))(png_ptr, ptr);
+      return;
+   }
+   else
+      png_free_default(png_ptr, ptr);
+}
+
+void PNGAPI
+png_free_default(png_structp png_ptr, png_voidp ptr)
+{
+#endif /* PNG_USER_MEM_SUPPORTED */
+
+   if (png_ptr == NULL || ptr == NULL)
+      return;
+
+   if (png_ptr->offset_table != NULL)
+   {
+      int i;
+
+      for (i = 0; i < png_ptr->offset_table_count; i++)
+      {
+         if (ptr == png_ptr->offset_table_ptr[i])
+         {
+            ptr = NULL;
+            png_ptr->offset_table_count_free++;
+            break;
+         }
+      }
+      if (png_ptr->offset_table_count_free == png_ptr->offset_table_count)
+      {
+         farfree(png_ptr->offset_table);
+         farfree(png_ptr->offset_table_ptr);
+         png_ptr->offset_table = NULL;
+         png_ptr->offset_table_ptr = NULL;
+      }
+   }
+
+   if (ptr != NULL)
+   {
+      farfree(ptr);
+   }
+}
+
+#else /* Not the Borland DOS special memory handler */
+
+/* Allocate memory for a png_struct or a png_info.  The malloc and
+   memset can be replaced by a single call to calloc() if this is thought
+   to improve performance noticably. */
+png_voidp /* PRIVATE */
+png_create_struct(int type)
+{
+#ifdef PNG_USER_MEM_SUPPORTED
+   return (png_create_struct_2(type, png_malloc_ptr_NULL, png_voidp_NULL));
+}
+
+/* Allocate memory for a png_struct or a png_info.  The malloc and
+   memset can be replaced by a single call to calloc() if this is thought
+   to improve performance noticably. */
+png_voidp /* PRIVATE */
+png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
+{
+#endif /* PNG_USER_MEM_SUPPORTED */
+   png_size_t size;
+   png_voidp struct_ptr;
+
+   if (type == PNG_STRUCT_INFO)
+      size = png_sizeof(png_info);
+   else if (type == PNG_STRUCT_PNG)
+      size = png_sizeof(png_struct);
+   else
+      return (NULL);
+
+#ifdef PNG_USER_MEM_SUPPORTED
+   if (malloc_fn != NULL)
+   {
+      png_struct dummy_struct;
+      png_structp png_ptr = &dummy_struct;
+      png_ptr->mem_ptr=mem_ptr;
+      struct_ptr = (*(malloc_fn))(png_ptr, size);
+      if (struct_ptr != NULL)
+         png_memset(struct_ptr, 0, size);
+      return (struct_ptr);
+   }
+#endif /* PNG_USER_MEM_SUPPORTED */
+
+#if defined(__TURBOC__) && !defined(__FLAT__)
+   struct_ptr = (png_voidp)farmalloc(size);
+#else
+# if defined(_MSC_VER) && defined(MAXSEG_64K)
+   struct_ptr = (png_voidp)halloc(size, 1);
+# else
+   struct_ptr = (png_voidp)malloc(size);
+# endif
+#endif
+   if (struct_ptr != NULL)
+      png_memset(struct_ptr, 0, size);
+
+   return (struct_ptr);
+}
+
+
+/* Free memory allocated by a png_create_struct() call */
+void /* PRIVATE */
+png_destroy_struct(png_voidp struct_ptr)
+{
+#ifdef PNG_USER_MEM_SUPPORTED
+   png_destroy_struct_2(struct_ptr, png_free_ptr_NULL, png_voidp_NULL);
+}
+
+/* Free memory allocated by a png_create_struct() call */
+void /* PRIVATE */
+png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
+    png_voidp mem_ptr)
+{
+#endif /* PNG_USER_MEM_SUPPORTED */
+   if (struct_ptr != NULL)
+   {
+#ifdef PNG_USER_MEM_SUPPORTED
+      if (free_fn != NULL)
+      {
+         png_struct dummy_struct;
+         png_structp png_ptr = &dummy_struct;
+         png_ptr->mem_ptr=mem_ptr;
+         (*(free_fn))(png_ptr, struct_ptr);
+         return;
+      }
+#endif /* PNG_USER_MEM_SUPPORTED */
+#if defined(__TURBOC__) && !defined(__FLAT__)
+      farfree(struct_ptr);
+#else
+# if defined(_MSC_VER) && defined(MAXSEG_64K)
+      hfree(struct_ptr);
+# else
+      free(struct_ptr);
+# endif
+#endif
+   }
+}
+
+/* Allocate memory.  For reasonable files, size should never exceed
+ * 64K.  However, zlib may allocate more then 64K if you don't tell
+ * it not to.  See zconf.h and png.h for more information.  zlib does
+ * need to allocate exactly 64K, so whatever you call here must
+ * have the ability to do that.
+ */
+
+png_voidp /* PRIVATE */
+png_calloc(png_structp png_ptr, png_uint_32 size)
+{
+   png_voidp ret;
+
+   ret = (png_malloc(png_ptr, size));
+   if (ret != NULL)
+      png_memset(ret,0,(png_size_t)size);
+   return (ret);
+}
+
+png_voidp PNGAPI
+png_malloc(png_structp png_ptr, png_uint_32 size)
+{
+   png_voidp ret;
+
+#ifdef PNG_USER_MEM_SUPPORTED
+   if (png_ptr == NULL || size == 0)
+      return (NULL);
+
+   if (png_ptr->malloc_fn != NULL)
+      ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
+   else
+      ret = (png_malloc_default(png_ptr, size));
+   if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+       png_error(png_ptr, "Out of Memory!");
+   return (ret);
+}
+
+png_voidp PNGAPI
+png_malloc_default(png_structp png_ptr, png_uint_32 size)
+{
+   png_voidp ret;
+#endif /* PNG_USER_MEM_SUPPORTED */
+
+   if (png_ptr == NULL || size == 0)
+      return (NULL);
+
+#ifdef PNG_MAX_MALLOC_64K
+   if (size > (png_uint_32)65536L)
+   {
+#ifndef PNG_USER_MEM_SUPPORTED
+      if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+         png_error(png_ptr, "Cannot Allocate > 64K");
+      else
+#endif
+         return NULL;
+   }
+#endif
+
+   /* Check for overflow */
+#if defined(__TURBOC__) && !defined(__FLAT__)
+   if (size != (unsigned long)size)
+      ret = NULL;
+   else
+      ret = farmalloc(size);
+#else
+# if defined(_MSC_VER) && defined(MAXSEG_64K)
+   if (size != (unsigned long)size)
+      ret = NULL;
+   else
+      ret = halloc(size, 1);
+# else
+   if (size != (size_t)size)
+      ret = NULL;
+   else
+      ret = malloc((size_t)size);
+# endif
+#endif
+
+#ifndef PNG_USER_MEM_SUPPORTED
+   if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+      png_error(png_ptr, "Out of Memory");
+#endif
+
+   return (ret);
+}
+
+/* Free a pointer allocated by png_malloc().  If ptr is NULL, return
+ * without taking any action.
+ */
+void PNGAPI
+png_free(png_structp png_ptr, png_voidp ptr)
+{
+   if (png_ptr == NULL || ptr == NULL)
+      return;
+
+#ifdef PNG_USER_MEM_SUPPORTED
+   if (png_ptr->free_fn != NULL)
+   {
+      (*(png_ptr->free_fn))(png_ptr, ptr);
+      return;
+   }
+   else
+      png_free_default(png_ptr, ptr);
+}
+void PNGAPI
+png_free_default(png_structp png_ptr, png_voidp ptr)
+{
+   if (png_ptr == NULL || ptr == NULL)
+      return;
+
+#endif /* PNG_USER_MEM_SUPPORTED */
+
+#if defined(__TURBOC__) && !defined(__FLAT__)
+   farfree(ptr);
+#else
+# if defined(_MSC_VER) && defined(MAXSEG_64K)
+   hfree(ptr);
+# else
+   free(ptr);
+# endif
+#endif
+}
+
+#endif /* Not Borland DOS special memory handler */
+
+#ifdef PNG_1_0_X
+#  define png_malloc_warn png_malloc
+#else
+/* This function was added at libpng version 1.2.3.  The png_malloc_warn()
+ * function will set up png_malloc() to issue a png_warning and return NULL
+ * instead of issuing a png_error, if it fails to allocate the requested
+ * memory.
+ */
+png_voidp PNGAPI
+png_malloc_warn(png_structp png_ptr, png_uint_32 size)
+{
+   png_voidp ptr;
+   png_uint_32 save_flags;
+   if (png_ptr == NULL)
+      return (NULL);
+
+   save_flags = png_ptr->flags;
+   png_ptr->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;
+   ptr = (png_voidp)png_malloc((png_structp)png_ptr, size);
+   png_ptr->flags=save_flags;
+   return(ptr);
+}
+#endif
+
+png_voidp PNGAPI
+png_memcpy_check (png_structp png_ptr, png_voidp s1, png_voidp s2,
+   png_uint_32 length)
+{
+   png_size_t size;
+
+   size = (png_size_t)length;
+   if ((png_uint_32)size != length)
+      png_error(png_ptr, "Overflow in png_memcpy_check.");
+
+   return(png_memcpy (s1, s2, size));
+}
+
+png_voidp PNGAPI
+png_memset_check (png_structp png_ptr, png_voidp s1, int value,
+   png_uint_32 length)
+{
+   png_size_t size;
+
+   size = (png_size_t)length;
+   if ((png_uint_32)size != length)
+      png_error(png_ptr, "Overflow in png_memset_check.");
+
+   return (png_memset (s1, value, size));
+
+}
+
+#ifdef PNG_USER_MEM_SUPPORTED
+/* This function is called when the application wants to use another method
+ * of allocating and freeing memory.
+ */
+void PNGAPI
+png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr
+  malloc_fn, png_free_ptr free_fn)
+{
+   if (png_ptr != NULL)
+   {
+      png_ptr->mem_ptr = mem_ptr;
+      png_ptr->malloc_fn = malloc_fn;
+      png_ptr->free_fn = free_fn;
+   }
+}
+
+/* This function returns a pointer to the mem_ptr associated with the user
+ * functions.  The application should free any memory associated with this
+ * pointer before png_write_destroy and png_read_destroy are called.
+ */
+png_voidp PNGAPI
+png_get_mem_ptr(png_structp png_ptr)
+{
+   if (png_ptr == NULL)
+      return (NULL);
+   return ((png_voidp)png_ptr->mem_ptr);
+}
+#endif /* PNG_USER_MEM_SUPPORTED */
+#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
diff --git a/src/libpng/pngpread.c b/src/libpng/pngpread.c
new file mode 100644
index 0000000..d066944
--- /dev/null
+++ b/src/libpng/pngpread.c
@@ -0,0 +1,1774 @@
+
+/* pngpread.c - read a png file in push mode
+ *
+ * Last changed in libpng 1.2.44 [June 26, 2010]
+ * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ */
+
+#define PNG_INTERNAL
+#define PNG_NO_PEDANTIC_WARNINGS
+#include "png.h"
+#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
+
+/* Push model modes */
+#define PNG_READ_SIG_MODE   0
+#define PNG_READ_CHUNK_MODE 1
+#define PNG_READ_IDAT_MODE  2
+#define PNG_SKIP_MODE       3
+#define PNG_READ_tEXt_MODE  4
+#define PNG_READ_zTXt_MODE  5
+#define PNG_READ_DONE_MODE  6
+#define PNG_READ_iTXt_MODE  7
+#define PNG_ERROR_MODE      8
+
+void PNGAPI
+png_process_data(png_structp png_ptr, png_infop info_ptr,
+   png_bytep buffer, png_size_t buffer_size)
+{
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   png_push_restore_buffer(png_ptr, buffer, buffer_size);
+
+   while (png_ptr->buffer_size)
+   {
+      png_process_some_data(png_ptr, info_ptr);
+   }
+}
+
+/* What we do with the incoming data depends on what we were previously
+ * doing before we ran out of data...
+ */
+void /* PRIVATE */
+png_process_some_data(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr == NULL)
+      return;
+
+   switch (png_ptr->process_mode)
+   {
+      case PNG_READ_SIG_MODE:
+      {
+         png_push_read_sig(png_ptr, info_ptr);
+         break;
+      }
+
+      case PNG_READ_CHUNK_MODE:
+      {
+         png_push_read_chunk(png_ptr, info_ptr);
+         break;
+      }
+
+      case PNG_READ_IDAT_MODE:
+      {
+         png_push_read_IDAT(png_ptr);
+         break;
+      }
+
+#ifdef PNG_READ_tEXt_SUPPORTED
+      case PNG_READ_tEXt_MODE:
+      {
+         png_push_read_tEXt(png_ptr, info_ptr);
+         break;
+      }
+
+#endif
+#ifdef PNG_READ_zTXt_SUPPORTED
+      case PNG_READ_zTXt_MODE:
+      {
+         png_push_read_zTXt(png_ptr, info_ptr);
+         break;
+      }
+
+#endif
+#ifdef PNG_READ_iTXt_SUPPORTED
+      case PNG_READ_iTXt_MODE:
+      {
+         png_push_read_iTXt(png_ptr, info_ptr);
+         break;
+      }
+
+#endif
+      case PNG_SKIP_MODE:
+      {
+         png_push_crc_finish(png_ptr);
+         break;
+      }
+
+      default:
+      {
+         png_ptr->buffer_size = 0;
+         break;
+      }
+   }
+}
+
+/* Read any remaining signature bytes from the stream and compare them with
+ * the correct PNG signature.  It is possible that this routine is called
+ * with bytes already read from the signature, either because they have been
+ * checked by the calling application, or because of multiple calls to this
+ * routine.
+ */
+void /* PRIVATE */
+png_push_read_sig(png_structp png_ptr, png_infop info_ptr)
+{
+   png_size_t num_checked = png_ptr->sig_bytes,
+             num_to_check = 8 - num_checked;
+
+   if (png_ptr->buffer_size < num_to_check)
+   {
+      num_to_check = png_ptr->buffer_size;
+   }
+
+   png_push_fill_buffer(png_ptr, &(info_ptr->signature[num_checked]),
+      num_to_check);
+   png_ptr->sig_bytes = (png_byte)(png_ptr->sig_bytes + num_to_check);
+
+   if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check))
+   {
+      if (num_checked < 4 &&
+          png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4))
+         png_error(png_ptr, "Not a PNG file");
+      else
+         png_error(png_ptr, "PNG file corrupted by ASCII conversion");
+   }
+   else
+   {
+      if (png_ptr->sig_bytes >= 8)
+      {
+         png_ptr->process_mode = PNG_READ_CHUNK_MODE;
+      }
+   }
+}
+
+void /* PRIVATE */
+png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+      PNG_CONST PNG_IHDR;
+      PNG_CONST PNG_IDAT;
+      PNG_CONST PNG_IEND;
+      PNG_CONST PNG_PLTE;
+#ifdef PNG_READ_bKGD_SUPPORTED
+      PNG_CONST PNG_bKGD;
+#endif
+#ifdef PNG_READ_cHRM_SUPPORTED
+      PNG_CONST PNG_cHRM;
+#endif
+#ifdef PNG_READ_gAMA_SUPPORTED
+      PNG_CONST PNG_gAMA;
+#endif
+#ifdef PNG_READ_hIST_SUPPORTED
+      PNG_CONST PNG_hIST;
+#endif
+#ifdef PNG_READ_iCCP_SUPPORTED
+      PNG_CONST PNG_iCCP;
+#endif
+#ifdef PNG_READ_iTXt_SUPPORTED
+      PNG_CONST PNG_iTXt;
+#endif
+#ifdef PNG_READ_oFFs_SUPPORTED
+      PNG_CONST PNG_oFFs;
+#endif
+#ifdef PNG_READ_pCAL_SUPPORTED
+      PNG_CONST PNG_pCAL;
+#endif
+#ifdef PNG_READ_pHYs_SUPPORTED
+      PNG_CONST PNG_pHYs;
+#endif
+#ifdef PNG_READ_sBIT_SUPPORTED
+      PNG_CONST PNG_sBIT;
+#endif
+#ifdef PNG_READ_sCAL_SUPPORTED
+      PNG_CONST PNG_sCAL;
+#endif
+#ifdef PNG_READ_sRGB_SUPPORTED
+      PNG_CONST PNG_sRGB;
+#endif
+#ifdef PNG_READ_sPLT_SUPPORTED
+      PNG_CONST PNG_sPLT;
+#endif
+#ifdef PNG_READ_tEXt_SUPPORTED
+      PNG_CONST PNG_tEXt;
+#endif
+#ifdef PNG_READ_tIME_SUPPORTED
+      PNG_CONST PNG_tIME;
+#endif
+#ifdef PNG_READ_tRNS_SUPPORTED
+      PNG_CONST PNG_tRNS;
+#endif
+#ifdef PNG_READ_zTXt_SUPPORTED
+      PNG_CONST PNG_zTXt;
+#endif
+#endif /* PNG_USE_LOCAL_ARRAYS */
+
+   /* First we make sure we have enough data for the 4 byte chunk name
+    * and the 4 byte chunk length before proceeding with decoding the
+    * chunk data.  To fully decode each of these chunks, we also make
+    * sure we have enough data in the buffer for the 4 byte CRC at the
+    * end of every chunk (except IDAT, which is handled separately).
+    */
+   if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER))
+   {
+      png_byte chunk_length[4];
+
+      if (png_ptr->buffer_size < 8)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+
+      png_push_fill_buffer(png_ptr, chunk_length, 4);
+      png_ptr->push_length = png_get_uint_31(png_ptr, chunk_length);
+      png_reset_crc(png_ptr);
+      png_crc_read(png_ptr, png_ptr->chunk_name, 4);
+      png_check_chunk_name(png_ptr, png_ptr->chunk_name);
+      png_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
+   }
+
+   if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+     if (png_ptr->mode & PNG_AFTER_IDAT)
+        png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT;
+
+   if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
+   {
+      if (png_ptr->push_length != 13)
+         png_error(png_ptr, "Invalid IHDR length");
+
+      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+
+      png_handle_IHDR(png_ptr, info_ptr, png_ptr->push_length);
+   }
+
+   else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
+   {
+      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+
+      png_handle_IEND(png_ptr, info_ptr, png_ptr->push_length);
+
+      png_ptr->process_mode = PNG_READ_DONE_MODE;
+      png_push_have_end(png_ptr, info_ptr);
+   }
+
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+   else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name))
+   {
+      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+
+      if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+         png_ptr->mode |= PNG_HAVE_IDAT;
+
+      png_handle_unknown(png_ptr, info_ptr, png_ptr->push_length);
+
+      if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
+         png_ptr->mode |= PNG_HAVE_PLTE;
+
+      else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+      {
+         if (!(png_ptr->mode & PNG_HAVE_IHDR))
+            png_error(png_ptr, "Missing IHDR before IDAT");
+
+         else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
+                  !(png_ptr->mode & PNG_HAVE_PLTE))
+            png_error(png_ptr, "Missing PLTE before IDAT");
+      }
+   }
+
+#endif
+   else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
+   {
+      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+      png_handle_PLTE(png_ptr, info_ptr, png_ptr->push_length);
+   }
+
+   else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+   {
+      /* If we reach an IDAT chunk, this means we have read all of the
+       * header chunks, and we can start reading the image (or if this
+       * is called after the image has been read - we have an error).
+       */
+
+      if (!(png_ptr->mode & PNG_HAVE_IHDR))
+         png_error(png_ptr, "Missing IHDR before IDAT");
+
+      else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
+          !(png_ptr->mode & PNG_HAVE_PLTE))
+         png_error(png_ptr, "Missing PLTE before IDAT");
+
+      if (png_ptr->mode & PNG_HAVE_IDAT)
+      {
+         if (!(png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
+            if (png_ptr->push_length == 0)
+               return;
+
+         if (png_ptr->mode & PNG_AFTER_IDAT)
+            png_error(png_ptr, "Too many IDAT's found");
+      }
+
+      png_ptr->idat_size = png_ptr->push_length;
+      png_ptr->mode |= PNG_HAVE_IDAT;
+      png_ptr->process_mode = PNG_READ_IDAT_MODE;
+      png_push_have_info(png_ptr, info_ptr);
+      png_ptr->zstream.avail_out =
+          (uInt) PNG_ROWBYTES(png_ptr->pixel_depth,
+          png_ptr->iwidth) + 1;
+      png_ptr->zstream.next_out = png_ptr->row_buf;
+      return;
+   }
+
+#ifdef PNG_READ_gAMA_SUPPORTED
+   else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4))
+   {
+      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+
+      png_handle_gAMA(png_ptr, info_ptr, png_ptr->push_length);
+   }
+
+#endif
+#ifdef PNG_READ_sBIT_SUPPORTED
+   else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4))
+   {
+      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+
+      png_handle_sBIT(png_ptr, info_ptr, png_ptr->push_length);
+   }
+
+#endif
+#ifdef PNG_READ_cHRM_SUPPORTED
+   else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4))
+   {
+      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+
+      png_handle_cHRM(png_ptr, info_ptr, png_ptr->push_length);
+   }
+
+#endif
+#ifdef PNG_READ_sRGB_SUPPORTED
+   else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4))
+   {
+      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+
+      png_handle_sRGB(png_ptr, info_ptr, png_ptr->push_length);
+   }
+
+#endif
+#ifdef PNG_READ_iCCP_SUPPORTED
+   else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4))
+   {
+      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+
+      png_handle_iCCP(png_ptr, info_ptr, png_ptr->push_length);
+   }
+
+#endif
+#ifdef PNG_READ_sPLT_SUPPORTED
+   else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4))
+   {
+      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+
+      png_handle_sPLT(png_ptr, info_ptr, png_ptr->push_length);
+   }
+
+#endif
+#ifdef PNG_READ_tRNS_SUPPORTED
+   else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4))
+   {
+      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+
+      png_handle_tRNS(png_ptr, info_ptr, png_ptr->push_length);
+   }
+
+#endif
+#ifdef PNG_READ_bKGD_SUPPORTED
+   else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4))
+   {
+      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+
+      png_handle_bKGD(png_ptr, info_ptr, png_ptr->push_length);
+   }
+
+#endif
+#ifdef PNG_READ_hIST_SUPPORTED
+   else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4))
+   {
+      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+
+      png_handle_hIST(png_ptr, info_ptr, png_ptr->push_length);
+   }
+
+#endif
+#ifdef PNG_READ_pHYs_SUPPORTED
+   else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4))
+   {
+      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+
+      png_handle_pHYs(png_ptr, info_ptr, png_ptr->push_length);
+   }
+
+#endif
+#ifdef PNG_READ_oFFs_SUPPORTED
+   else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4))
+   {
+      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+
+      png_handle_oFFs(png_ptr, info_ptr, png_ptr->push_length);
+   }
+#endif
+
+#ifdef PNG_READ_pCAL_SUPPORTED
+   else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4))
+   {
+      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+
+      png_handle_pCAL(png_ptr, info_ptr, png_ptr->push_length);
+   }
+
+#endif
+#ifdef PNG_READ_sCAL_SUPPORTED
+   else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4))
+   {
+      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+
+      png_handle_sCAL(png_ptr, info_ptr, png_ptr->push_length);
+   }
+
+#endif
+#ifdef PNG_READ_tIME_SUPPORTED
+   else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4))
+   {
+      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+
+      png_handle_tIME(png_ptr, info_ptr, png_ptr->push_length);
+   }
+
+#endif
+#ifdef PNG_READ_tEXt_SUPPORTED
+   else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4))
+   {
+      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+
+      png_push_handle_tEXt(png_ptr, info_ptr, png_ptr->push_length);
+   }
+
+#endif
+#ifdef PNG_READ_zTXt_SUPPORTED
+   else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4))
+   {
+      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+
+      png_push_handle_zTXt(png_ptr, info_ptr, png_ptr->push_length);
+   }
+
+#endif
+#ifdef PNG_READ_iTXt_SUPPORTED
+   else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
+   {
+      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+
+      png_push_handle_iTXt(png_ptr, info_ptr, png_ptr->push_length);
+   }
+
+#endif
+   else
+   {
+      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+      png_push_handle_unknown(png_ptr, info_ptr, png_ptr->push_length);
+   }
+
+   png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
+}
+
+void /* PRIVATE */
+png_push_crc_skip(png_structp png_ptr, png_uint_32 skip)
+{
+   png_ptr->process_mode = PNG_SKIP_MODE;
+   png_ptr->skip_length = skip;
+}
+
+void /* PRIVATE */
+png_push_crc_finish(png_structp png_ptr)
+{
+   if (png_ptr->skip_length && png_ptr->save_buffer_size)
+   {
+      png_size_t save_size;
+
+      if (png_ptr->skip_length < (png_uint_32)png_ptr->save_buffer_size)
+         save_size = (png_size_t)png_ptr->skip_length;
+      else
+         save_size = png_ptr->save_buffer_size;
+
+      png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size);
+
+      png_ptr->skip_length -= save_size;
+      png_ptr->buffer_size -= save_size;
+      png_ptr->save_buffer_size -= save_size;
+      png_ptr->save_buffer_ptr += save_size;
+   }
+   if (png_ptr->skip_length && png_ptr->current_buffer_size)
+   {
+      png_size_t save_size;
+
+      if (png_ptr->skip_length < (png_uint_32)png_ptr->current_buffer_size)
+         save_size = (png_size_t)png_ptr->skip_length;
+      else
+         save_size = png_ptr->current_buffer_size;
+
+      png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size);
+
+      png_ptr->skip_length -= save_size;
+      png_ptr->buffer_size -= save_size;
+      png_ptr->current_buffer_size -= save_size;
+      png_ptr->current_buffer_ptr += save_size;
+   }
+   if (!png_ptr->skip_length)
+   {
+      if (png_ptr->buffer_size < 4)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+
+      png_crc_finish(png_ptr, 0);
+      png_ptr->process_mode = PNG_READ_CHUNK_MODE;
+   }
+}
+
+void PNGAPI
+png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length)
+{
+   png_bytep ptr;
+
+   if (png_ptr == NULL)
+      return;
+
+   ptr = buffer;
+   if (png_ptr->save_buffer_size)
+   {
+      png_size_t save_size;
+
+      if (length < png_ptr->save_buffer_size)
+         save_size = length;
+      else
+         save_size = png_ptr->save_buffer_size;
+
+      png_memcpy(ptr, png_ptr->save_buffer_ptr, save_size);
+      length -= save_size;
+      ptr += save_size;
+      png_ptr->buffer_size -= save_size;
+      png_ptr->save_buffer_size -= save_size;
+      png_ptr->save_buffer_ptr += save_size;
+   }
+   if (length && png_ptr->current_buffer_size)
+   {
+      png_size_t save_size;
+
+      if (length < png_ptr->current_buffer_size)
+         save_size = length;
+
+      else
+         save_size = png_ptr->current_buffer_size;
+
+      png_memcpy(ptr, png_ptr->current_buffer_ptr, save_size);
+      png_ptr->buffer_size -= save_size;
+      png_ptr->current_buffer_size -= save_size;
+      png_ptr->current_buffer_ptr += save_size;
+   }
+}
+
+void /* PRIVATE */
+png_push_save_buffer(png_structp png_ptr)
+{
+   if (png_ptr->save_buffer_size)
+   {
+      if (png_ptr->save_buffer_ptr != png_ptr->save_buffer)
+      {
+         png_size_t i, istop;
+         png_bytep sp;
+         png_bytep dp;
+
+         istop = png_ptr->save_buffer_size;
+         for (i = 0, sp = png_ptr->save_buffer_ptr, dp = png_ptr->save_buffer;
+            i < istop; i++, sp++, dp++)
+         {
+            *dp = *sp;
+         }
+      }
+   }
+   if (png_ptr->save_buffer_size + png_ptr->current_buffer_size >
+      png_ptr->save_buffer_max)
+   {
+      png_size_t new_max;
+      png_bytep old_buffer;
+
+      if (png_ptr->save_buffer_size > PNG_SIZE_MAX -
+         (png_ptr->current_buffer_size + 256))
+      {
+        png_error(png_ptr, "Potential overflow of save_buffer");
+      }
+
+      new_max = png_ptr->save_buffer_size + png_ptr->current_buffer_size + 256;
+      old_buffer = png_ptr->save_buffer;
+      png_ptr->save_buffer = (png_bytep)png_malloc_warn(png_ptr,
+         (png_uint_32)new_max);
+      if (png_ptr->save_buffer == NULL)
+      {
+        png_free(png_ptr, old_buffer);
+        png_error(png_ptr, "Insufficient memory for save_buffer");
+      }
+      png_memcpy(png_ptr->save_buffer, old_buffer, png_ptr->save_buffer_size);
+      png_free(png_ptr, old_buffer);
+      png_ptr->save_buffer_max = new_max;
+   }
+   if (png_ptr->current_buffer_size)
+   {
+      png_memcpy(png_ptr->save_buffer + png_ptr->save_buffer_size,
+         png_ptr->current_buffer_ptr, png_ptr->current_buffer_size);
+      png_ptr->save_buffer_size += png_ptr->current_buffer_size;
+      png_ptr->current_buffer_size = 0;
+   }
+   png_ptr->save_buffer_ptr = png_ptr->save_buffer;
+   png_ptr->buffer_size = 0;
+}
+
+void /* PRIVATE */
+png_push_restore_buffer(png_structp png_ptr, png_bytep buffer,
+   png_size_t buffer_length)
+{
+   png_ptr->current_buffer = buffer;
+   png_ptr->current_buffer_size = buffer_length;
+   png_ptr->buffer_size = buffer_length + png_ptr->save_buffer_size;
+   png_ptr->current_buffer_ptr = png_ptr->current_buffer;
+}
+
+void /* PRIVATE */
+png_push_read_IDAT(png_structp png_ptr)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+   PNG_CONST PNG_IDAT;
+#endif
+   if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER))
+   {
+      png_byte chunk_length[4];
+
+      if (png_ptr->buffer_size < 8)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+
+      png_push_fill_buffer(png_ptr, chunk_length, 4);
+      png_ptr->push_length = png_get_uint_31(png_ptr, chunk_length);
+      png_reset_crc(png_ptr);
+      png_crc_read(png_ptr, png_ptr->chunk_name, 4);
+      png_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
+
+      if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+      {
+         png_ptr->process_mode = PNG_READ_CHUNK_MODE;
+         if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
+            png_error(png_ptr, "Not enough compressed data");
+         return;
+      }
+
+      png_ptr->idat_size = png_ptr->push_length;
+   }
+   if (png_ptr->idat_size && png_ptr->save_buffer_size)
+   {
+      png_size_t save_size;
+
+      if (png_ptr->idat_size < (png_uint_32)png_ptr->save_buffer_size)
+      {
+         save_size = (png_size_t)png_ptr->idat_size;
+
+         /* Check for overflow */
+         if ((png_uint_32)save_size != png_ptr->idat_size)
+            png_error(png_ptr, "save_size overflowed in pngpread");
+      }
+      else
+         save_size = png_ptr->save_buffer_size;
+
+      png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size);
+
+      png_process_IDAT_data(png_ptr, png_ptr->save_buffer_ptr, save_size);
+
+      png_ptr->idat_size -= save_size;
+      png_ptr->buffer_size -= save_size;
+      png_ptr->save_buffer_size -= save_size;
+      png_ptr->save_buffer_ptr += save_size;
+   }
+   if (png_ptr->idat_size && png_ptr->current_buffer_size)
+   {
+      png_size_t save_size;
+
+      if (png_ptr->idat_size < (png_uint_32)png_ptr->current_buffer_size)
+      {
+         save_size = (png_size_t)png_ptr->idat_size;
+
+         /* Check for overflow */
+         if ((png_uint_32)save_size != png_ptr->idat_size)
+            png_error(png_ptr, "save_size overflowed in pngpread");
+      }
+      else
+         save_size = png_ptr->current_buffer_size;
+
+      png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size);
+
+      png_process_IDAT_data(png_ptr, png_ptr->current_buffer_ptr, save_size);
+
+      png_ptr->idat_size -= save_size;
+      png_ptr->buffer_size -= save_size;
+      png_ptr->current_buffer_size -= save_size;
+      png_ptr->current_buffer_ptr += save_size;
+   }
+   if (!png_ptr->idat_size)
+   {
+      if (png_ptr->buffer_size < 4)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+
+      png_crc_finish(png_ptr, 0);
+      png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
+      png_ptr->mode |= PNG_AFTER_IDAT;
+   }
+}
+
+void /* PRIVATE */
+png_process_IDAT_data(png_structp png_ptr, png_bytep buffer,
+   png_size_t buffer_length)
+{
+   /* The caller checks for a non-zero buffer length. */
+   if (!(buffer_length > 0) || buffer == NULL)
+      png_error(png_ptr, "No IDAT data (internal error)");
+
+   /* This routine must process all the data it has been given
+    * before returning, calling the row callback as required to
+    * handle the uncompressed results.
+    */
+   png_ptr->zstream.next_in = buffer;
+   png_ptr->zstream.avail_in = (uInt)buffer_length;
+
+   /* Keep going until the decompressed data is all processed
+    * or the stream marked as finished.
+    */
+   while (png_ptr->zstream.avail_in > 0 &&
+	  !(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
+   {
+      int ret;
+
+      /* We have data for zlib, but we must check that zlib
+       * has somewhere to put the results.  It doesn't matter
+       * if we don't expect any results -- it may be the input
+       * data is just the LZ end code.
+       */
+      if (!(png_ptr->zstream.avail_out > 0))
+      {
+         png_ptr->zstream.avail_out =
+             (uInt) PNG_ROWBYTES(png_ptr->pixel_depth,
+             png_ptr->iwidth) + 1;
+         png_ptr->zstream.next_out = png_ptr->row_buf;
+      }
+
+      /* Using Z_SYNC_FLUSH here means that an unterminated
+       * LZ stream can still be handled (a stream with a missing
+       * end code), otherwise (Z_NO_FLUSH) a future zlib
+       * implementation might defer output and, therefore,
+       * change the current behavior.  (See comments in inflate.c
+       * for why this doesn't happen at present with zlib 1.2.5.)
+       */
+      ret = inflate(&png_ptr->zstream, Z_SYNC_FLUSH);
+
+      /* Check for any failure before proceeding. */
+      if (ret != Z_OK && ret != Z_STREAM_END)
+      {
+	 /* Terminate the decompression. */
+	 png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
+
+         /* This may be a truncated stream (missing or
+	  * damaged end code).  Treat that as a warning.
+	  */
+         if (png_ptr->row_number >= png_ptr->num_rows ||
+	     png_ptr->pass > 6)
+	    png_warning(png_ptr, "Truncated compressed data in IDAT");
+	 else
+	    png_error(png_ptr, "Decompression error in IDAT");
+
+	 /* Skip the check on unprocessed input */
+         return;
+      }
+
+      /* Did inflate output any data? */
+      if (png_ptr->zstream.next_out != png_ptr->row_buf)
+      {
+	 /* Is this unexpected data after the last row?
+	  * If it is, artificially terminate the LZ output
+	  * here.
+	  */
+         if (png_ptr->row_number >= png_ptr->num_rows ||
+	     png_ptr->pass > 6)
+         {
+	    /* Extra data. */
+	    png_warning(png_ptr, "Extra compressed data in IDAT");
+            png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
+	    /* Do no more processing; skip the unprocessed
+	     * input check below.
+	     */
+            return;
+	 }
+
+	 /* Do we have a complete row? */
+	 if (png_ptr->zstream.avail_out == 0)
+	    png_push_process_row(png_ptr);
+      }
+
+      /* And check for the end of the stream. */
+      if (ret == Z_STREAM_END)
+	 png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
+   }
+
+   /* All the data should have been processed, if anything
+    * is left at this point we have bytes of IDAT data
+    * after the zlib end code.
+    */
+   if (png_ptr->zstream.avail_in > 0)
+      png_warning(png_ptr, "Extra compression data");
+}
+
+void /* PRIVATE */
+png_push_process_row(png_structp png_ptr)
+{
+   png_ptr->row_info.color_type = png_ptr->color_type;
+   png_ptr->row_info.width = png_ptr->iwidth;
+   png_ptr->row_info.channels = png_ptr->channels;
+   png_ptr->row_info.bit_depth = png_ptr->bit_depth;
+   png_ptr->row_info.pixel_depth = png_ptr->pixel_depth;
+
+   png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
+       png_ptr->row_info.width);
+
+   png_read_filter_row(png_ptr, &(png_ptr->row_info),
+       png_ptr->row_buf + 1, png_ptr->prev_row + 1,
+       (int)(png_ptr->row_buf[0]));
+
+   png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
+      png_ptr->rowbytes + 1);
+
+   if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA))
+      png_do_read_transformations(png_ptr);
+
+#ifdef PNG_READ_INTERLACING_SUPPORTED
+   /* Blow up interlaced rows to full size */
+   if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
+   {
+      if (png_ptr->pass < 6)
+/*       old interface (pre-1.0.9):
+         png_do_read_interlace(&(png_ptr->row_info),
+             png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
+ */
+         png_do_read_interlace(png_ptr);
+
+    switch (png_ptr->pass)
+    {
+         case 0:
+         {
+            int i;
+            for (i = 0; i < 8 && png_ptr->pass == 0; i++)
+            {
+               png_push_have_row(png_ptr, png_ptr->row_buf + 1);
+               png_read_push_finish_row(png_ptr); /* Updates png_ptr->pass */
+            }
+
+            if (png_ptr->pass == 2) /* Pass 1 might be empty */
+            {
+               for (i = 0; i < 4 && png_ptr->pass == 2; i++)
+               {
+                  png_push_have_row(png_ptr, png_bytep_NULL);
+                  png_read_push_finish_row(png_ptr);
+               }
+            }
+
+            if (png_ptr->pass == 4 && png_ptr->height <= 4)
+            {
+               for (i = 0; i < 2 && png_ptr->pass == 4; i++)
+               {
+                  png_push_have_row(png_ptr, png_bytep_NULL);
+                  png_read_push_finish_row(png_ptr);
+               }
+            }
+
+            if (png_ptr->pass == 6 && png_ptr->height <= 4)
+            {
+                  png_push_have_row(png_ptr, png_bytep_NULL);
+                png_read_push_finish_row(png_ptr);
+            }
+
+            break;
+         }
+
+         case 1:
+         {
+            int i;
+            for (i = 0; i < 8 && png_ptr->pass == 1; i++)
+            {
+               png_push_have_row(png_ptr, png_ptr->row_buf + 1);
+               png_read_push_finish_row(png_ptr);
+            }
+
+            if (png_ptr->pass == 2) /* Skip top 4 generated rows */
+            {
+               for (i = 0; i < 4 && png_ptr->pass == 2; i++)
+               {
+                  png_push_have_row(png_ptr, png_bytep_NULL);
+                  png_read_push_finish_row(png_ptr);
+               }
+            }
+
+            break;
+         }
+
+         case 2:
+         {
+            int i;
+
+            for (i = 0; i < 4 && png_ptr->pass == 2; i++)
+            {
+               png_push_have_row(png_ptr, png_ptr->row_buf + 1);
+               png_read_push_finish_row(png_ptr);
+            }
+
+            for (i = 0; i < 4 && png_ptr->pass == 2; i++)
+            {
+                  png_push_have_row(png_ptr, png_bytep_NULL);
+               png_read_push_finish_row(png_ptr);
+            }
+
+            if (png_ptr->pass == 4) /* Pass 3 might be empty */
+            {
+               for (i = 0; i < 2 && png_ptr->pass == 4; i++)
+               {
+                  png_push_have_row(png_ptr, png_bytep_NULL);
+                  png_read_push_finish_row(png_ptr);
+               }
+            }
+
+            break;
+         }
+
+         case 3:
+         {
+            int i;
+
+            for (i = 0; i < 4 && png_ptr->pass == 3; i++)
+            {
+               png_push_have_row(png_ptr, png_ptr->row_buf + 1);
+               png_read_push_finish_row(png_ptr);
+            }
+
+            if (png_ptr->pass == 4) /* Skip top two generated rows */
+            {
+               for (i = 0; i < 2 && png_ptr->pass == 4; i++)
+               {
+                  png_push_have_row(png_ptr, png_bytep_NULL);
+                  png_read_push_finish_row(png_ptr);
+               }
+            }
+
+            break;
+         }
+
+         case 4:
+         {
+            int i;
+
+            for (i = 0; i < 2 && png_ptr->pass == 4; i++)
+            {
+               png_push_have_row(png_ptr, png_ptr->row_buf + 1);
+               png_read_push_finish_row(png_ptr);
+            }
+
+            for (i = 0; i < 2 && png_ptr->pass == 4; i++)
+            {
+                  png_push_have_row(png_ptr, png_bytep_NULL);
+               png_read_push_finish_row(png_ptr);
+            }
+
+            if (png_ptr->pass == 6) /* Pass 5 might be empty */
+            {
+                  png_push_have_row(png_ptr, png_bytep_NULL);
+               png_read_push_finish_row(png_ptr);
+            }
+
+            break;
+         }
+
+         case 5:
+         {
+            int i;
+
+            for (i = 0; i < 2 && png_ptr->pass == 5; i++)
+            {
+               png_push_have_row(png_ptr, png_ptr->row_buf + 1);
+               png_read_push_finish_row(png_ptr);
+            }
+
+            if (png_ptr->pass == 6) /* Skip top generated row */
+            {
+                  png_push_have_row(png_ptr, png_bytep_NULL);
+               png_read_push_finish_row(png_ptr);
+            }
+
+            break;
+         }
+         case 6:
+         {
+            png_push_have_row(png_ptr, png_ptr->row_buf + 1);
+            png_read_push_finish_row(png_ptr);
+
+            if (png_ptr->pass != 6)
+               break;
+
+                  png_push_have_row(png_ptr, png_bytep_NULL);
+            png_read_push_finish_row(png_ptr);
+         }
+      }
+   }
+   else
+#endif
+   {
+      png_push_have_row(png_ptr, png_ptr->row_buf + 1);
+      png_read_push_finish_row(png_ptr);
+   }
+}
+
+void /* PRIVATE */
+png_read_push_finish_row(png_structp png_ptr)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+   /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+
+   /* Start of interlace block */
+   PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
+
+   /* Offset to next interlace block */
+   PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
+
+   /* Start of interlace block in the y direction */
+   PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
+
+   /* Offset to next interlace block in the y direction */
+   PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
+
+   /* Height of interlace block.  This is not currently used - if you need
+    * it, uncomment it here and in png.h
+   PNG_CONST int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
+   */
+#endif
+
+   png_ptr->row_number++;
+   if (png_ptr->row_number < png_ptr->num_rows)
+      return;
+
+#ifdef PNG_READ_INTERLACING_SUPPORTED
+   if (png_ptr->interlaced)
+   {
+      png_ptr->row_number = 0;
+      png_memset_check(png_ptr, png_ptr->prev_row, 0,
+         png_ptr->rowbytes + 1);
+      do
+      {
+         png_ptr->pass++;
+         if ((png_ptr->pass == 1 && png_ptr->width < 5) ||
+             (png_ptr->pass == 3 && png_ptr->width < 3) ||
+             (png_ptr->pass == 5 && png_ptr->width < 2))
+           png_ptr->pass++;
+
+         if (png_ptr->pass > 7)
+            png_ptr->pass--;
+
+         if (png_ptr->pass >= 7)
+            break;
+
+         png_ptr->iwidth = (png_ptr->width +
+            png_pass_inc[png_ptr->pass] - 1 -
+            png_pass_start[png_ptr->pass]) /
+            png_pass_inc[png_ptr->pass];
+
+         if (png_ptr->transformations & PNG_INTERLACE)
+            break;
+
+         png_ptr->num_rows = (png_ptr->height +
+            png_pass_yinc[png_ptr->pass] - 1 -
+            png_pass_ystart[png_ptr->pass]) /
+            png_pass_yinc[png_ptr->pass];
+
+      } while (png_ptr->iwidth == 0 || png_ptr->num_rows == 0);
+   }
+#endif /* PNG_READ_INTERLACING_SUPPORTED */
+}
+
+#ifdef PNG_READ_tEXt_SUPPORTED
+void /* PRIVATE */
+png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
+   length)
+{
+   if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
+      {
+         png_error(png_ptr, "Out of place tEXt");
+         info_ptr = info_ptr; /* To quiet some compiler warnings */
+      }
+
+#ifdef PNG_MAX_MALLOC_64K
+   png_ptr->skip_length = 0;  /* This may not be necessary */
+
+   if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */
+   {
+      png_warning(png_ptr, "tEXt chunk too large to fit in memory");
+      png_ptr->skip_length = length - (png_uint_32)65535L;
+      length = (png_uint_32)65535L;
+   }
+#endif
+
+   png_ptr->current_text = (png_charp)png_malloc(png_ptr,
+      (png_uint_32)(length + 1));
+   png_ptr->current_text[length] = '\0';
+   png_ptr->current_text_ptr = png_ptr->current_text;
+   png_ptr->current_text_size = (png_size_t)length;
+   png_ptr->current_text_left = (png_size_t)length;
+   png_ptr->process_mode = PNG_READ_tEXt_MODE;
+}
+
+void /* PRIVATE */
+png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr->buffer_size && png_ptr->current_text_left)
+   {
+      png_size_t text_size;
+
+      if (png_ptr->buffer_size < png_ptr->current_text_left)
+         text_size = png_ptr->buffer_size;
+
+      else
+         text_size = png_ptr->current_text_left;
+
+      png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
+      png_ptr->current_text_left -= text_size;
+      png_ptr->current_text_ptr += text_size;
+   }
+   if (!(png_ptr->current_text_left))
+   {
+      png_textp text_ptr;
+      png_charp text;
+      png_charp key;
+      int ret;
+
+      if (png_ptr->buffer_size < 4)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+
+      png_push_crc_finish(png_ptr);
+
+#ifdef PNG_MAX_MALLOC_64K
+      if (png_ptr->skip_length)
+         return;
+#endif
+
+      key = png_ptr->current_text;
+
+      for (text = key; *text; text++)
+         /* Empty loop */ ;
+
+      if (text < key + png_ptr->current_text_size)
+         text++;
+
+      text_ptr = (png_textp)png_malloc(png_ptr,
+         (png_uint_32)png_sizeof(png_text));
+      text_ptr->compression = PNG_TEXT_COMPRESSION_NONE;
+      text_ptr->key = key;
+#ifdef PNG_iTXt_SUPPORTED
+      text_ptr->lang = NULL;
+      text_ptr->lang_key = NULL;
+#endif
+      text_ptr->text = text;
+
+      ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
+
+      png_free(png_ptr, key);
+      png_free(png_ptr, text_ptr);
+      png_ptr->current_text = NULL;
+
+      if (ret)
+        png_warning(png_ptr, "Insufficient memory to store text chunk.");
+   }
+}
+#endif
+
+#ifdef PNG_READ_zTXt_SUPPORTED
+void /* PRIVATE */
+png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
+   length)
+{
+   if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
+      {
+         png_error(png_ptr, "Out of place zTXt");
+         info_ptr = info_ptr; /* To quiet some compiler warnings */
+      }
+
+#ifdef PNG_MAX_MALLOC_64K
+   /* We can't handle zTXt chunks > 64K, since we don't have enough space
+    * to be able to store the uncompressed data.  Actually, the threshold
+    * is probably around 32K, but it isn't as definite as 64K is.
+    */
+   if (length > (png_uint_32)65535L)
+   {
+      png_warning(png_ptr, "zTXt chunk too large to fit in memory");
+      png_push_crc_skip(png_ptr, length);
+      return;
+   }
+#endif
+
+   png_ptr->current_text = (png_charp)png_malloc(png_ptr,
+      (png_uint_32)(length + 1));
+   png_ptr->current_text[length] = '\0';
+   png_ptr->current_text_ptr = png_ptr->current_text;
+   png_ptr->current_text_size = (png_size_t)length;
+   png_ptr->current_text_left = (png_size_t)length;
+   png_ptr->process_mode = PNG_READ_zTXt_MODE;
+}
+
+void /* PRIVATE */
+png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr->buffer_size && png_ptr->current_text_left)
+   {
+      png_size_t text_size;
+
+      if (png_ptr->buffer_size < (png_uint_32)png_ptr->current_text_left)
+         text_size = png_ptr->buffer_size;
+
+      else
+         text_size = png_ptr->current_text_left;
+
+      png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
+      png_ptr->current_text_left -= text_size;
+      png_ptr->current_text_ptr += text_size;
+   }
+   if (!(png_ptr->current_text_left))
+   {
+      png_textp text_ptr;
+      png_charp text;
+      png_charp key;
+      int ret;
+      png_size_t text_size, key_size;
+
+      if (png_ptr->buffer_size < 4)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+
+      png_push_crc_finish(png_ptr);
+
+      key = png_ptr->current_text;
+
+      for (text = key; *text; text++)
+         /* Empty loop */ ;
+
+      /* zTXt can't have zero text */
+      if (text >= key + png_ptr->current_text_size)
+      {
+         png_ptr->current_text = NULL;
+         png_free(png_ptr, key);
+         return;
+      }
+
+      text++;
+
+      if (*text != PNG_TEXT_COMPRESSION_zTXt) /* Check compression byte */
+      {
+         png_ptr->current_text = NULL;
+         png_free(png_ptr, key);
+         return;
+      }
+
+      text++;
+
+      png_ptr->zstream.next_in = (png_bytep )text;
+      png_ptr->zstream.avail_in = (uInt)(png_ptr->current_text_size -
+         (text - key));
+      png_ptr->zstream.next_out = png_ptr->zbuf;
+      png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+
+      key_size = text - key;
+      text_size = 0;
+      text = NULL;
+      ret = Z_STREAM_END;
+
+      while (png_ptr->zstream.avail_in)
+      {
+         ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
+         if (ret != Z_OK && ret != Z_STREAM_END)
+         {
+            inflateReset(&png_ptr->zstream);
+            png_ptr->zstream.avail_in = 0;
+            png_ptr->current_text = NULL;
+            png_free(png_ptr, key);
+            png_free(png_ptr, text);
+            return;
+         }
+         if (!(png_ptr->zstream.avail_out) || ret == Z_STREAM_END)
+         {
+            if (text == NULL)
+            {
+               text = (png_charp)png_malloc(png_ptr,
+                     (png_uint_32)(png_ptr->zbuf_size
+                     - png_ptr->zstream.avail_out + key_size + 1));
+
+               png_memcpy(text + key_size, png_ptr->zbuf,
+                  png_ptr->zbuf_size - png_ptr->zstream.avail_out);
+
+               png_memcpy(text, key, key_size);
+
+               text_size = key_size + png_ptr->zbuf_size -
+                  png_ptr->zstream.avail_out;
+
+               *(text + text_size) = '\0';
+            }
+            else
+            {
+               png_charp tmp;
+
+               tmp = text;
+               text = (png_charp)png_malloc(png_ptr, text_size +
+                  (png_uint_32)(png_ptr->zbuf_size 
+                  - png_ptr->zstream.avail_out + 1));
+
+               png_memcpy(text, tmp, text_size);
+               png_free(png_ptr, tmp);
+
+               png_memcpy(text + text_size, png_ptr->zbuf,
+                  png_ptr->zbuf_size - png_ptr->zstream.avail_out);
+
+               text_size += png_ptr->zbuf_size - png_ptr->zstream.avail_out;
+               *(text + text_size) = '\0';
+            }
+            if (ret != Z_STREAM_END)
+            {
+               png_ptr->zstream.next_out = png_ptr->zbuf;
+               png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+            }
+         }
+         else
+         {
+            break;
+         }
+
+         if (ret == Z_STREAM_END)
+            break;
+      }
+
+      inflateReset(&png_ptr->zstream);
+      png_ptr->zstream.avail_in = 0;
+
+      if (ret != Z_STREAM_END)
+      {
+         png_ptr->current_text = NULL;
+         png_free(png_ptr, key);
+         png_free(png_ptr, text);
+         return;
+      }
+
+      png_ptr->current_text = NULL;
+      png_free(png_ptr, key);
+      key = text;
+      text += key_size;
+
+      text_ptr = (png_textp)png_malloc(png_ptr,
+          (png_uint_32)png_sizeof(png_text));
+      text_ptr->compression = PNG_TEXT_COMPRESSION_zTXt;
+      text_ptr->key = key;
+#ifdef PNG_iTXt_SUPPORTED
+      text_ptr->lang = NULL;
+      text_ptr->lang_key = NULL;
+#endif
+      text_ptr->text = text;
+
+      ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
+
+      png_free(png_ptr, key);
+      png_free(png_ptr, text_ptr);
+
+      if (ret)
+        png_warning(png_ptr, "Insufficient memory to store text chunk.");
+   }
+}
+#endif
+
+#ifdef PNG_READ_iTXt_SUPPORTED
+void /* PRIVATE */
+png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
+   length)
+{
+   if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
+      {
+         png_error(png_ptr, "Out of place iTXt");
+         info_ptr = info_ptr; /* To quiet some compiler warnings */
+      }
+
+#ifdef PNG_MAX_MALLOC_64K
+   png_ptr->skip_length = 0;  /* This may not be necessary */
+
+   if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */
+   {
+      png_warning(png_ptr, "iTXt chunk too large to fit in memory");
+      png_ptr->skip_length = length - (png_uint_32)65535L;
+      length = (png_uint_32)65535L;
+   }
+#endif
+
+   png_ptr->current_text = (png_charp)png_malloc(png_ptr,
+      (png_uint_32)(length + 1));
+   png_ptr->current_text[length] = '\0';
+   png_ptr->current_text_ptr = png_ptr->current_text;
+   png_ptr->current_text_size = (png_size_t)length;
+   png_ptr->current_text_left = (png_size_t)length;
+   png_ptr->process_mode = PNG_READ_iTXt_MODE;
+}
+
+void /* PRIVATE */
+png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
+{
+
+   if (png_ptr->buffer_size && png_ptr->current_text_left)
+   {
+      png_size_t text_size;
+
+      if (png_ptr->buffer_size < png_ptr->current_text_left)
+         text_size = png_ptr->buffer_size;
+
+      else
+         text_size = png_ptr->current_text_left;
+
+      png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
+      png_ptr->current_text_left -= text_size;
+      png_ptr->current_text_ptr += text_size;
+   }
+   if (!(png_ptr->current_text_left))
+   {
+      png_textp text_ptr;
+      png_charp key;
+      int comp_flag;
+      png_charp lang;
+      png_charp lang_key;
+      png_charp text;
+      int ret;
+
+      if (png_ptr->buffer_size < 4)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+
+      png_push_crc_finish(png_ptr);
+
+#ifdef PNG_MAX_MALLOC_64K
+      if (png_ptr->skip_length)
+         return;
+#endif
+
+      key = png_ptr->current_text;
+
+      for (lang = key; *lang; lang++)
+         /* Empty loop */ ;
+
+      if (lang < key + png_ptr->current_text_size - 3)
+         lang++;
+
+      comp_flag = *lang++;
+      lang++;     /* Skip comp_type, always zero */
+
+      for (lang_key = lang; *lang_key; lang_key++)
+         /* Empty loop */ ;
+
+      lang_key++;        /* Skip NUL separator */
+
+      text=lang_key;
+
+      if (lang_key < key + png_ptr->current_text_size - 1)
+      {
+        for (; *text; text++)
+           /* Empty loop */ ;
+      }
+
+      if (text < key + png_ptr->current_text_size)
+         text++;
+
+      text_ptr = (png_textp)png_malloc(png_ptr,
+         (png_uint_32)png_sizeof(png_text));
+
+      text_ptr->compression = comp_flag + 2;
+      text_ptr->key = key;
+      text_ptr->lang = lang;
+      text_ptr->lang_key = lang_key;
+      text_ptr->text = text;
+      text_ptr->text_length = 0;
+      text_ptr->itxt_length = png_strlen(text);
+
+      ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
+
+      png_ptr->current_text = NULL;
+
+      png_free(png_ptr, text_ptr);
+      if (ret)
+         png_warning(png_ptr, "Insufficient memory to store iTXt chunk.");
+   }
+}
+#endif
+
+/* This function is called when we haven't found a handler for this
+ * chunk.  If there isn't a problem with the chunk itself (ie a bad chunk
+ * name or a critical chunk), the chunk is (currently) silently ignored.
+ */
+void /* PRIVATE */
+png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32
+   length)
+{
+   png_uint_32 skip = 0;
+
+   if (!(png_ptr->chunk_name[0] & 0x20))
+   {
+#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
+      if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
+         PNG_HANDLE_CHUNK_ALWAYS
+#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
+         && png_ptr->read_user_chunk_fn == NULL
+#endif
+         )
+#endif
+         png_chunk_error(png_ptr, "unknown critical chunk");
+
+      info_ptr = info_ptr; /* To quiet some compiler warnings */
+   }
+
+#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
+   if (png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS)
+   {
+#ifdef PNG_MAX_MALLOC_64K
+      if (length > (png_uint_32)65535L)
+      {
+          png_warning(png_ptr, "unknown chunk too large to fit in memory");
+          skip = length - (png_uint_32)65535L;
+          length = (png_uint_32)65535L;
+      }
+#endif
+      png_memcpy((png_charp)png_ptr->unknown_chunk.name,
+                 (png_charp)png_ptr->chunk_name, 
+                 png_sizeof(png_ptr->unknown_chunk.name));
+      png_ptr->unknown_chunk.name[png_sizeof(png_ptr->unknown_chunk.name) - 1]
+        = '\0';
+
+      png_ptr->unknown_chunk.size = (png_size_t)length;
+
+      if (length == 0)
+         png_ptr->unknown_chunk.data = NULL;
+
+      else
+      {
+         png_ptr->unknown_chunk.data = (png_bytep)png_malloc(png_ptr,
+            (png_uint_32)length);
+         png_crc_read(png_ptr, (png_bytep)png_ptr->unknown_chunk.data, length);
+      }
+
+#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
+      if (png_ptr->read_user_chunk_fn != NULL)
+      {
+         /* Callback to user unknown chunk handler */
+         int ret;
+         ret = (*(png_ptr->read_user_chunk_fn))
+           (png_ptr, &png_ptr->unknown_chunk);
+
+         if (ret < 0)
+            png_chunk_error(png_ptr, "error in user chunk");
+
+         if (ret == 0)
+         {
+            if (!(png_ptr->chunk_name[0] & 0x20))
+               if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
+                    PNG_HANDLE_CHUNK_ALWAYS)
+                  png_chunk_error(png_ptr, "unknown critical chunk");
+            png_set_unknown_chunks(png_ptr, info_ptr,
+               &png_ptr->unknown_chunk, 1);
+         }
+      }
+
+      else
+#endif
+        png_set_unknown_chunks(png_ptr, info_ptr, &png_ptr->unknown_chunk, 1);
+      png_free(png_ptr, png_ptr->unknown_chunk.data);
+      png_ptr->unknown_chunk.data = NULL;
+   }
+
+   else
+#endif
+      skip=length;
+   png_push_crc_skip(png_ptr, skip);
+}
+
+void /* PRIVATE */
+png_push_have_info(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr->info_fn != NULL)
+      (*(png_ptr->info_fn))(png_ptr, info_ptr);
+}
+
+void /* PRIVATE */
+png_push_have_end(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr->end_fn != NULL)
+      (*(png_ptr->end_fn))(png_ptr, info_ptr);
+}
+
+void /* PRIVATE */
+png_push_have_row(png_structp png_ptr, png_bytep row)
+{
+   if (png_ptr->row_fn != NULL)
+      (*(png_ptr->row_fn))(png_ptr, row, png_ptr->row_number,
+         (int)png_ptr->pass);
+}
+
+void PNGAPI
+png_progressive_combine_row (png_structp png_ptr,
+   png_bytep old_row, png_bytep new_row)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+   PNG_CONST int FARDATA png_pass_dsp_mask[7] =
+      {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
+#endif
+
+   if (png_ptr == NULL)
+      return;
+
+   if (new_row != NULL)    /* new_row must == png_ptr->row_buf here. */
+      png_combine_row(png_ptr, old_row, png_pass_dsp_mask[png_ptr->pass]);
+}
+
+void PNGAPI
+png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr,
+   png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
+   png_progressive_end_ptr end_fn)
+{
+   if (png_ptr == NULL)
+      return;
+
+   png_ptr->info_fn = info_fn;
+   png_ptr->row_fn = row_fn;
+   png_ptr->end_fn = end_fn;
+
+   png_set_read_fn(png_ptr, progressive_ptr, png_push_fill_buffer);
+}
+
+png_voidp PNGAPI
+png_get_progressive_ptr(png_structp png_ptr)
+{
+   if (png_ptr == NULL)
+      return (NULL);
+
+   return png_ptr->io_ptr;
+}
+#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
diff --git a/src/libpng/pngread.c b/src/libpng/pngread.c
new file mode 100644
index 0000000..6207624
--- /dev/null
+++ b/src/libpng/pngread.c
@@ -0,0 +1,1528 @@
+
+/* pngread.c - read a PNG file
+ *
+ * Last changed in libpng 1.2.44 [June 26, 2010]
+ * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
+ * This file contains routines that an application calls directly to
+ * read a PNG file or stream.
+ */
+
+#define PNG_INTERNAL
+#define PNG_NO_PEDANTIC_WARNINGS
+#include "png.h"
+#ifdef PNG_READ_SUPPORTED
+
+
+/* Create a PNG structure for reading, and allocate any memory needed. */
+png_structp PNGAPI
+png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr,
+   png_error_ptr error_fn, png_error_ptr warn_fn)
+{
+
+#ifdef PNG_USER_MEM_SUPPORTED
+   return (png_create_read_struct_2(user_png_ver, error_ptr, error_fn,
+      warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL));
+}
+
+/* Alternate create PNG structure for reading, and allocate any memory
+ * needed.
+ */
+png_structp PNGAPI
+png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
+   png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
+   png_malloc_ptr malloc_fn, png_free_ptr free_fn)
+{
+#endif /* PNG_USER_MEM_SUPPORTED */
+
+#ifdef PNG_SETJMP_SUPPORTED
+   volatile
+#endif
+   png_structp png_ptr;
+
+#ifdef PNG_SETJMP_SUPPORTED
+#ifdef USE_FAR_KEYWORD
+   jmp_buf jmpbuf;
+#endif
+#endif
+
+   int i;
+
+   png_debug(1, "in png_create_read_struct");
+
+#ifdef PNG_USER_MEM_SUPPORTED
+   png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
+      (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
+#else
+   png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
+#endif
+   if (png_ptr == NULL)
+      return (NULL);
+
+   /* Added at libpng-1.2.6 */
+#ifdef PNG_USER_LIMITS_SUPPORTED
+   png_ptr->user_width_max = PNG_USER_WIDTH_MAX;
+   png_ptr->user_height_max = PNG_USER_HEIGHT_MAX;
+#  ifdef PNG_USER_CHUNK_CACHE_MAX
+   /* Added at libpng-1.2.43 and 1.4.0 */
+   png_ptr->user_chunk_cache_max = PNG_USER_CHUNK_CACHE_MAX;
+#  endif
+#  ifdef PNG_SET_USER_CHUNK_MALLOC_MAX
+   /* Added at libpng-1.2.43 and 1.4.1 */
+   png_ptr->user_chunk_malloc_max = PNG_USER_CHUNK_MALLOC_MAX;
+#  endif
+#endif
+
+#ifdef PNG_SETJMP_SUPPORTED
+#ifdef USE_FAR_KEYWORD
+   if (setjmp(jmpbuf))
+#else
+   if (setjmp(png_ptr->jmpbuf))
+#endif
+   {
+      png_free(png_ptr, png_ptr->zbuf);
+      png_ptr->zbuf = NULL;
+#ifdef PNG_USER_MEM_SUPPORTED
+      png_destroy_struct_2((png_voidp)png_ptr,
+         (png_free_ptr)free_fn, (png_voidp)mem_ptr);
+#else
+      png_destroy_struct((png_voidp)png_ptr);
+#endif
+      return (NULL);
+   }
+#ifdef USE_FAR_KEYWORD
+   png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
+#endif
+#endif /* PNG_SETJMP_SUPPORTED */
+
+#ifdef PNG_USER_MEM_SUPPORTED
+   png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
+#endif
+
+   png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
+
+   if (user_png_ver)
+   {
+      i = 0;
+      do
+      {
+         if (user_png_ver[i] != png_libpng_ver[i])
+            png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+      } while (png_libpng_ver[i++]);
+    }
+    else
+         png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+
+
+    if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
+    {
+       /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
+       * we must recompile any applications that use any older library version.
+       * For versions after libpng 1.0, we will be compatible, so we need
+       * only check the first digit.
+       */
+      if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
+          (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
+          (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
+      {
+#if defined(PNG_STDIO_SUPPORTED) && !defined(_WIN32_WCE)
+         char msg[80];
+         if (user_png_ver)
+         {
+           png_snprintf(msg, 80,
+              "Application was compiled with png.h from libpng-%.20s",
+              user_png_ver);
+           png_warning(png_ptr, msg);
+         }
+         png_snprintf(msg, 80,
+             "Application  is  running with png.c from libpng-%.20s",
+             png_libpng_ver);
+         png_warning(png_ptr, msg);
+#endif
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+         png_ptr->flags = 0;
+#endif
+         png_error(png_ptr,
+            "Incompatible libpng version in application and library");
+      }
+   }
+
+   /* Initialize zbuf - compression buffer */
+   png_ptr->zbuf_size = PNG_ZBUF_SIZE;
+   png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
+     (png_uint_32)png_ptr->zbuf_size);
+   png_ptr->zstream.zalloc = png_zalloc;
+   png_ptr->zstream.zfree = png_zfree;
+   png_ptr->zstream.opaque = (voidpf)png_ptr;
+
+      switch (inflateInit(&png_ptr->zstream))
+      {
+         case Z_OK: /* Do nothing */ break;
+         case Z_MEM_ERROR:
+         case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory error");
+            break;
+         case Z_VERSION_ERROR: png_error(png_ptr, "zlib version error");
+            break;
+         default: png_error(png_ptr, "Unknown zlib error");
+      }
+
+
+   png_ptr->zstream.next_out = png_ptr->zbuf;
+   png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+
+   png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL);
+
+#ifdef PNG_SETJMP_SUPPORTED
+/* Applications that neglect to set up their own setjmp() and then
+   encounter a png_error() will longjmp here.  Since the jmpbuf is
+   then meaningless we abort instead of returning. */
+#ifdef USE_FAR_KEYWORD
+   if (setjmp(jmpbuf))
+       PNG_ABORT();
+   png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
+#else
+   if (setjmp(png_ptr->jmpbuf))
+       PNG_ABORT();
+#endif
+#endif /* PNG_SETJMP_SUPPORTED */
+
+   return (png_ptr);
+}
+
+#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
+/* Initialize PNG structure for reading, and allocate any memory needed.
+ * This interface is deprecated in favour of the png_create_read_struct(),
+ * and it will disappear as of libpng-1.3.0.
+ */
+#undef png_read_init
+void PNGAPI
+png_read_init(png_structp png_ptr)
+{
+   /* We only come here via pre-1.0.7-compiled applications */
+   png_read_init_2(png_ptr, "1.0.6 or earlier", 0, 0);
+}
+
+void PNGAPI
+png_read_init_2(png_structp png_ptr, png_const_charp user_png_ver,
+   png_size_t png_struct_size, png_size_t png_info_size)
+{
+   /* We only come here via pre-1.0.12-compiled applications */
+   if (png_ptr == NULL)
+      return;
+#if defined(PNG_STDIO_SUPPORTED) && !defined(_WIN32_WCE)
+   if (png_sizeof(png_struct) > png_struct_size ||
+      png_sizeof(png_info) > png_info_size)
+   {
+      char msg[80];
+      png_ptr->warning_fn = NULL;
+      if (user_png_ver)
+      {
+        png_snprintf(msg, 80,
+           "Application was compiled with png.h from libpng-%.20s",
+           user_png_ver);
+        png_warning(png_ptr, msg);
+      }
+      png_snprintf(msg, 80,
+         "Application  is  running with png.c from libpng-%.20s",
+         png_libpng_ver);
+      png_warning(png_ptr, msg);
+   }
+#endif
+   if (png_sizeof(png_struct) > png_struct_size)
+   {
+      png_ptr->error_fn = NULL;
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+      png_ptr->flags = 0;
+#endif
+      png_error(png_ptr,
+      "The png struct allocated by the application for reading is"
+      " too small.");
+   }
+   if (png_sizeof(png_info) > png_info_size)
+   {
+      png_ptr->error_fn = NULL;
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+      png_ptr->flags = 0;
+#endif
+      png_error(png_ptr,
+        "The info struct allocated by application for reading is"
+        " too small.");
+   }
+   png_read_init_3(&png_ptr, user_png_ver, png_struct_size);
+}
+#endif /* PNG_1_0_X || PNG_1_2_X */
+
+void PNGAPI
+png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
+   png_size_t png_struct_size)
+{
+#ifdef PNG_SETJMP_SUPPORTED
+   jmp_buf tmp_jmp;  /* to save current jump buffer */
+#endif
+
+   int i = 0;
+
+   png_structp png_ptr=*ptr_ptr;
+
+   if (png_ptr == NULL)
+      return;
+
+   do
+   {
+      if (user_png_ver[i] != png_libpng_ver[i])
+      {
+#ifdef PNG_LEGACY_SUPPORTED
+        png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+#else
+        png_ptr->warning_fn = NULL;
+        png_warning(png_ptr,
+         "Application uses deprecated png_read_init() and should be"
+         " recompiled.");
+        break;
+#endif
+      }
+   } while (png_libpng_ver[i++]);
+
+   png_debug(1, "in png_read_init_3");
+
+#ifdef PNG_SETJMP_SUPPORTED
+   /* Save jump buffer and error functions */
+   png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
+#endif
+
+   if (png_sizeof(png_struct) > png_struct_size)
+   {
+      png_destroy_struct(png_ptr);
+      *ptr_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
+      png_ptr = *ptr_ptr;
+   }
+
+   /* Reset all variables to 0 */
+   png_memset(png_ptr, 0, png_sizeof(png_struct));
+
+#ifdef PNG_SETJMP_SUPPORTED
+   /* Restore jump buffer */
+   png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
+#endif
+
+   /* Added at libpng-1.2.6 */
+#ifdef PNG_SET_USER_LIMITS_SUPPORTED
+   png_ptr->user_width_max = PNG_USER_WIDTH_MAX;
+   png_ptr->user_height_max = PNG_USER_HEIGHT_MAX;
+#endif
+
+   /* Initialize zbuf - compression buffer */
+   png_ptr->zbuf_size = PNG_ZBUF_SIZE;
+   png_ptr->zstream.zalloc = png_zalloc;
+   png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
+     (png_uint_32)png_ptr->zbuf_size);
+   png_ptr->zstream.zalloc = png_zalloc;
+   png_ptr->zstream.zfree = png_zfree;
+   png_ptr->zstream.opaque = (voidpf)png_ptr;
+
+   switch (inflateInit(&png_ptr->zstream))
+   {
+      case Z_OK: /* Do nothing */ break;
+      case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory error"); break;
+      case Z_VERSION_ERROR: png_error(png_ptr, "zlib version error");
+          break;
+      default: png_error(png_ptr, "Unknown zlib error");
+   }
+
+   png_ptr->zstream.next_out = png_ptr->zbuf;
+   png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+
+   png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL);
+}
+
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
+/* Read the information before the actual image data.  This has been
+ * changed in v0.90 to allow reading a file that already has the magic
+ * bytes read from the stream.  You can tell libpng how many bytes have
+ * been read from the beginning of the stream (up to the maximum of 8)
+ * via png_set_sig_bytes(), and we will only check the remaining bytes
+ * here.  The application can then have access to the signature bytes we
+ * read if it is determined that this isn't a valid PNG file.
+ */
+void PNGAPI
+png_read_info(png_structp png_ptr, png_infop info_ptr)
+{
+   png_debug(1, "in png_read_info");
+ 
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+ 
+   /* If we haven't checked all of the PNG signature bytes, do so now. */
+   if (png_ptr->sig_bytes < 8)
+   {
+      png_size_t num_checked = png_ptr->sig_bytes,
+                 num_to_check = 8 - num_checked;
+
+      png_read_data(png_ptr, &(info_ptr->signature[num_checked]), num_to_check);
+      png_ptr->sig_bytes = 8;
+
+      if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check))
+      {
+         if (num_checked < 4 &&
+             png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4))
+            png_error(png_ptr, "Not a PNG file");
+         else
+            png_error(png_ptr, "PNG file corrupted by ASCII conversion");
+      }
+      if (num_checked < 3)
+         png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
+   }
+
+   for (;;)
+   {
+#ifdef PNG_USE_LOCAL_ARRAYS
+      PNG_CONST PNG_IHDR;
+      PNG_CONST PNG_IDAT;
+      PNG_CONST PNG_IEND;
+      PNG_CONST PNG_PLTE;
+#ifdef PNG_READ_bKGD_SUPPORTED
+      PNG_CONST PNG_bKGD;
+#endif
+#ifdef PNG_READ_cHRM_SUPPORTED
+      PNG_CONST PNG_cHRM;
+#endif
+#ifdef PNG_READ_gAMA_SUPPORTED
+      PNG_CONST PNG_gAMA;
+#endif
+#ifdef PNG_READ_hIST_SUPPORTED
+      PNG_CONST PNG_hIST;
+#endif
+#ifdef PNG_READ_iCCP_SUPPORTED
+      PNG_CONST PNG_iCCP;
+#endif
+#ifdef PNG_READ_iTXt_SUPPORTED
+      PNG_CONST PNG_iTXt;
+#endif
+#ifdef PNG_READ_oFFs_SUPPORTED
+      PNG_CONST PNG_oFFs;
+#endif
+#ifdef PNG_READ_pCAL_SUPPORTED
+      PNG_CONST PNG_pCAL;
+#endif
+#ifdef PNG_READ_pHYs_SUPPORTED
+      PNG_CONST PNG_pHYs;
+#endif
+#ifdef PNG_READ_sBIT_SUPPORTED
+      PNG_CONST PNG_sBIT;
+#endif
+#ifdef PNG_READ_sCAL_SUPPORTED
+      PNG_CONST PNG_sCAL;
+#endif
+#ifdef PNG_READ_sPLT_SUPPORTED
+      PNG_CONST PNG_sPLT;
+#endif
+#ifdef PNG_READ_sRGB_SUPPORTED
+      PNG_CONST PNG_sRGB;
+#endif
+#ifdef PNG_READ_tEXt_SUPPORTED
+      PNG_CONST PNG_tEXt;
+#endif
+#ifdef PNG_READ_tIME_SUPPORTED
+      PNG_CONST PNG_tIME;
+#endif
+#ifdef PNG_READ_tRNS_SUPPORTED
+      PNG_CONST PNG_tRNS;
+#endif
+#ifdef PNG_READ_zTXt_SUPPORTED
+      PNG_CONST PNG_zTXt;
+#endif
+#endif /* PNG_USE_LOCAL_ARRAYS */
+      png_uint_32 length = png_read_chunk_header(png_ptr);
+      PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;
+
+      /* This should be a binary subdivision search or a hash for
+       * matching the chunk name rather than a linear search.
+       */
+      if (!png_memcmp(chunk_name, png_IDAT, 4))
+        if (png_ptr->mode & PNG_AFTER_IDAT)
+          png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT;
+
+      if (!png_memcmp(chunk_name, png_IHDR, 4))
+         png_handle_IHDR(png_ptr, info_ptr, length);
+      else if (!png_memcmp(chunk_name, png_IEND, 4))
+         png_handle_IEND(png_ptr, info_ptr, length);
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+      else if (png_handle_as_unknown(png_ptr, chunk_name))
+      {
+         if (!png_memcmp(chunk_name, png_IDAT, 4))
+            png_ptr->mode |= PNG_HAVE_IDAT;
+         png_handle_unknown(png_ptr, info_ptr, length);
+         if (!png_memcmp(chunk_name, png_PLTE, 4))
+            png_ptr->mode |= PNG_HAVE_PLTE;
+         else if (!png_memcmp(chunk_name, png_IDAT, 4))
+         {
+            if (!(png_ptr->mode & PNG_HAVE_IHDR))
+               png_error(png_ptr, "Missing IHDR before IDAT");
+            else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
+                     !(png_ptr->mode & PNG_HAVE_PLTE))
+               png_error(png_ptr, "Missing PLTE before IDAT");
+            break;
+         }
+      }
+#endif
+      else if (!png_memcmp(chunk_name, png_PLTE, 4))
+         png_handle_PLTE(png_ptr, info_ptr, length);
+      else if (!png_memcmp(chunk_name, png_IDAT, 4))
+      {
+         if (!(png_ptr->mode & PNG_HAVE_IHDR))
+            png_error(png_ptr, "Missing IHDR before IDAT");
+         else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
+                  !(png_ptr->mode & PNG_HAVE_PLTE))
+            png_error(png_ptr, "Missing PLTE before IDAT");
+
+         png_ptr->idat_size = length;
+         png_ptr->mode |= PNG_HAVE_IDAT;
+         break;
+      }
+#ifdef PNG_READ_bKGD_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_bKGD, 4))
+         png_handle_bKGD(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_cHRM_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_cHRM, 4))
+         png_handle_cHRM(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_gAMA_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_gAMA, 4))
+         png_handle_gAMA(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_hIST_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_hIST, 4))
+         png_handle_hIST(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_oFFs_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_oFFs, 4))
+         png_handle_oFFs(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_pCAL_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_pCAL, 4))
+         png_handle_pCAL(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_sCAL_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_sCAL, 4))
+         png_handle_sCAL(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_pHYs_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_pHYs, 4))
+         png_handle_pHYs(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_sBIT_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_sBIT, 4))
+         png_handle_sBIT(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_sRGB_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_sRGB, 4))
+         png_handle_sRGB(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_iCCP_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_iCCP, 4))
+         png_handle_iCCP(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_sPLT_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_sPLT, 4))
+         png_handle_sPLT(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_tEXt_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_tEXt, 4))
+         png_handle_tEXt(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_tIME_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_tIME, 4))
+         png_handle_tIME(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_tRNS_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_tRNS, 4))
+         png_handle_tRNS(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_zTXt_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_zTXt, 4))
+         png_handle_zTXt(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_iTXt_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_iTXt, 4))
+         png_handle_iTXt(png_ptr, info_ptr, length);
+#endif
+      else
+         png_handle_unknown(png_ptr, info_ptr, length);
+   }
+}
+#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
+
+/* Optional call to update the users info_ptr structure */
+void PNGAPI
+png_read_update_info(png_structp png_ptr, png_infop info_ptr)
+{
+   png_debug(1, "in png_read_update_info");
+ 
+   if (png_ptr == NULL)
+      return;
+   if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
+      png_read_start_row(png_ptr);
+   else
+      png_warning(png_ptr,
+      "Ignoring extra png_read_update_info() call; row buffer not reallocated");
+
+   png_read_transform_info(png_ptr, info_ptr);
+}
+
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
+/* Initialize palette, background, etc, after transformations
+ * are set, but before any reading takes place.  This allows
+ * the user to obtain a gamma-corrected palette, for example.
+ * If the user doesn't call this, we will do it ourselves.
+ */
+void PNGAPI
+png_start_read_image(png_structp png_ptr)
+{
+   png_debug(1, "in png_start_read_image");
+ 
+   if (png_ptr == NULL)
+      return;
+   if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
+      png_read_start_row(png_ptr);
+}
+#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
+
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
+void PNGAPI
+png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
+{
+   PNG_CONST PNG_IDAT;
+   PNG_CONST int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55,
+      0xff};
+   PNG_CONST int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
+   int ret;
+ 
+   if (png_ptr == NULL)
+      return;
+ 
+   png_debug2(1, "in png_read_row (row %lu, pass %d)",
+      png_ptr->row_number, png_ptr->pass);
+
+   if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
+      png_read_start_row(png_ptr);
+   if (png_ptr->row_number == 0 && png_ptr->pass == 0)
+   {
+   /* Check for transforms that have been set but were defined out */
+#if defined(PNG_WRITE_INVERT_SUPPORTED) && !defined(PNG_READ_INVERT_SUPPORTED)
+   if (png_ptr->transformations & PNG_INVERT_MONO)
+      png_warning(png_ptr, "PNG_READ_INVERT_SUPPORTED is not defined.");
+#endif
+#if defined(PNG_WRITE_FILLER_SUPPORTED) && !defined(PNG_READ_FILLER_SUPPORTED)
+   if (png_ptr->transformations & PNG_FILLER)
+      png_warning(png_ptr, "PNG_READ_FILLER_SUPPORTED is not defined.");
+#endif
+#if defined(PNG_WRITE_PACKSWAP_SUPPORTED) && \
+    !defined(PNG_READ_PACKSWAP_SUPPORTED)
+   if (png_ptr->transformations & PNG_PACKSWAP)
+      png_warning(png_ptr, "PNG_READ_PACKSWAP_SUPPORTED is not defined.");
+#endif
+#if defined(PNG_WRITE_PACK_SUPPORTED) && !defined(PNG_READ_PACK_SUPPORTED)
+   if (png_ptr->transformations & PNG_PACK)
+      png_warning(png_ptr, "PNG_READ_PACK_SUPPORTED is not defined.");
+#endif
+#if defined(PNG_WRITE_SHIFT_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED)
+   if (png_ptr->transformations & PNG_SHIFT)
+      png_warning(png_ptr, "PNG_READ_SHIFT_SUPPORTED is not defined.");
+#endif
+#if defined(PNG_WRITE_BGR_SUPPORTED) && !defined(PNG_READ_BGR_SUPPORTED)
+   if (png_ptr->transformations & PNG_BGR)
+      png_warning(png_ptr, "PNG_READ_BGR_SUPPORTED is not defined.");
+#endif
+#if defined(PNG_WRITE_SWAP_SUPPORTED) && !defined(PNG_READ_SWAP_SUPPORTED)
+   if (png_ptr->transformations & PNG_SWAP_BYTES)
+      png_warning(png_ptr, "PNG_READ_SWAP_SUPPORTED is not defined.");
+#endif
+   }
+
+#ifdef PNG_READ_INTERLACING_SUPPORTED
+   /* If interlaced and we do not need a new row, combine row and return */
+   if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
+   {
+      switch (png_ptr->pass)
+      {
+         case 0:
+            if (png_ptr->row_number & 0x07)
+            {
+               if (dsp_row != NULL)
+                  png_combine_row(png_ptr, dsp_row,
+                     png_pass_dsp_mask[png_ptr->pass]);
+               png_read_finish_row(png_ptr);
+               return;
+            }
+            break;
+         case 1:
+            if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
+            {
+               if (dsp_row != NULL)
+                  png_combine_row(png_ptr, dsp_row,
+                     png_pass_dsp_mask[png_ptr->pass]);
+               png_read_finish_row(png_ptr);
+               return;
+            }
+            break;
+         case 2:
+            if ((png_ptr->row_number & 0x07) != 4)
+            {
+               if (dsp_row != NULL && (png_ptr->row_number & 4))
+                  png_combine_row(png_ptr, dsp_row,
+                     png_pass_dsp_mask[png_ptr->pass]);
+               png_read_finish_row(png_ptr);
+               return;
+            }
+            break;
+         case 3:
+            if ((png_ptr->row_number & 3) || png_ptr->width < 3)
+            {
+               if (dsp_row != NULL)
+                  png_combine_row(png_ptr, dsp_row,
+                     png_pass_dsp_mask[png_ptr->pass]);
+               png_read_finish_row(png_ptr);
+               return;
+            }
+            break;
+         case 4:
+            if ((png_ptr->row_number & 3) != 2)
+            {
+               if (dsp_row != NULL && (png_ptr->row_number & 2))
+                  png_combine_row(png_ptr, dsp_row,
+                     png_pass_dsp_mask[png_ptr->pass]);
+               png_read_finish_row(png_ptr);
+               return;
+            }
+            break;
+         case 5:
+            if ((png_ptr->row_number & 1) || png_ptr->width < 2)
+            {
+               if (dsp_row != NULL)
+                  png_combine_row(png_ptr, dsp_row,
+                     png_pass_dsp_mask[png_ptr->pass]);
+               png_read_finish_row(png_ptr);
+               return;
+            }
+            break;
+         case 6:
+            if (!(png_ptr->row_number & 1))
+            {
+               png_read_finish_row(png_ptr);
+               return;
+            }
+            break;
+      }
+   }
+#endif
+
+   if (!(png_ptr->mode & PNG_HAVE_IDAT))
+      png_error(png_ptr, "Invalid attempt to read row data");
+
+   png_ptr->zstream.next_out = png_ptr->row_buf;
+   png_ptr->zstream.avail_out =
+       (uInt)(PNG_ROWBYTES(png_ptr->pixel_depth,
+       png_ptr->iwidth) + 1);
+   do
+   {
+      if (!(png_ptr->zstream.avail_in))
+      {
+         while (!png_ptr->idat_size)
+         {
+            png_crc_finish(png_ptr, 0);
+
+            png_ptr->idat_size = png_read_chunk_header(png_ptr);
+            if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+               png_error(png_ptr, "Not enough image data");
+         }
+         png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size;
+         png_ptr->zstream.next_in = png_ptr->zbuf;
+         if (png_ptr->zbuf_size > png_ptr->idat_size)
+            png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size;
+         png_crc_read(png_ptr, png_ptr->zbuf,
+            (png_size_t)png_ptr->zstream.avail_in);
+         png_ptr->idat_size -= png_ptr->zstream.avail_in;
+      }
+      ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
+      if (ret == Z_STREAM_END)
+      {
+         if (png_ptr->zstream.avail_out || png_ptr->zstream.avail_in ||
+            png_ptr->idat_size)
+            png_error(png_ptr, "Extra compressed data");
+         png_ptr->mode |= PNG_AFTER_IDAT;
+         png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
+         break;
+      }
+      if (ret != Z_OK)
+         png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg :
+                   "Decompression error");
+
+   } while (png_ptr->zstream.avail_out);
+
+   png_ptr->row_info.color_type = png_ptr->color_type;
+   png_ptr->row_info.width = png_ptr->iwidth;
+   png_ptr->row_info.channels = png_ptr->channels;
+   png_ptr->row_info.bit_depth = png_ptr->bit_depth;
+   png_ptr->row_info.pixel_depth = png_ptr->pixel_depth;
+   png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
+       png_ptr->row_info.width);
+
+   if (png_ptr->row_buf[0])
+   png_read_filter_row(png_ptr, &(png_ptr->row_info),
+      png_ptr->row_buf + 1, png_ptr->prev_row + 1,
+      (int)(png_ptr->row_buf[0]));
+
+   png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
+      png_ptr->rowbytes + 1);
+
+#ifdef PNG_MNG_FEATURES_SUPPORTED
+   if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+      (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
+   {
+      /* Intrapixel differencing */
+      png_do_read_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
+   }
+#endif
+
+
+   if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA))
+      png_do_read_transformations(png_ptr);
+
+#ifdef PNG_READ_INTERLACING_SUPPORTED
+   /* Blow up interlaced rows to full size */
+   if (png_ptr->interlaced &&
+      (png_ptr->transformations & PNG_INTERLACE))
+   {
+      if (png_ptr->pass < 6)
+         /* Old interface (pre-1.0.9):
+          * png_do_read_interlace(&(png_ptr->row_info),
+          *    png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
+          */
+         png_do_read_interlace(png_ptr);
+
+      if (dsp_row != NULL)
+         png_combine_row(png_ptr, dsp_row,
+            png_pass_dsp_mask[png_ptr->pass]);
+      if (row != NULL)
+         png_combine_row(png_ptr, row,
+            png_pass_mask[png_ptr->pass]);
+   }
+   else
+#endif
+   {
+      if (row != NULL)
+         png_combine_row(png_ptr, row, 0xff);
+      if (dsp_row != NULL)
+         png_combine_row(png_ptr, dsp_row, 0xff);
+   }
+   png_read_finish_row(png_ptr);
+
+   if (png_ptr->read_row_fn != NULL)
+      (*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
+}
+#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
+
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
+/* Read one or more rows of image data.  If the image is interlaced,
+ * and png_set_interlace_handling() has been called, the rows need to
+ * contain the contents of the rows from the previous pass.  If the
+ * image has alpha or transparency, and png_handle_alpha()[*] has been
+ * called, the rows contents must be initialized to the contents of the
+ * screen.
+ *
+ * "row" holds the actual image, and pixels are placed in it
+ * as they arrive.  If the image is displayed after each pass, it will
+ * appear to "sparkle" in.  "display_row" can be used to display a
+ * "chunky" progressive image, with finer detail added as it becomes
+ * available.  If you do not want this "chunky" display, you may pass
+ * NULL for display_row.  If you do not want the sparkle display, and
+ * you have not called png_handle_alpha(), you may pass NULL for rows.
+ * If you have called png_handle_alpha(), and the image has either an
+ * alpha channel or a transparency chunk, you must provide a buffer for
+ * rows.  In this case, you do not have to provide a display_row buffer
+ * also, but you may.  If the image is not interlaced, or if you have
+ * not called png_set_interlace_handling(), the display_row buffer will
+ * be ignored, so pass NULL to it.
+ *
+ * [*] png_handle_alpha() does not exist yet, as of this version of libpng
+ */
+
+void PNGAPI
+png_read_rows(png_structp png_ptr, png_bytepp row,
+   png_bytepp display_row, png_uint_32 num_rows)
+{
+   png_uint_32 i;
+   png_bytepp rp;
+   png_bytepp dp;
+
+   png_debug(1, "in png_read_rows");
+ 
+   if (png_ptr == NULL)
+      return;
+   rp = row;
+   dp = display_row;
+   if (rp != NULL && dp != NULL)
+      for (i = 0; i < num_rows; i++)
+      {
+         png_bytep rptr = *rp++;
+         png_bytep dptr = *dp++;
+
+         png_read_row(png_ptr, rptr, dptr);
+      }
+   else if (rp != NULL)
+      for (i = 0; i < num_rows; i++)
+      {
+         png_bytep rptr = *rp;
+         png_read_row(png_ptr, rptr, png_bytep_NULL);
+         rp++;
+      }
+   else if (dp != NULL)
+      for (i = 0; i < num_rows; i++)
+      {
+         png_bytep dptr = *dp;
+         png_read_row(png_ptr, png_bytep_NULL, dptr);
+         dp++;
+      }
+}
+#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
+
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
+/* Read the entire image.  If the image has an alpha channel or a tRNS
+ * chunk, and you have called png_handle_alpha()[*], you will need to
+ * initialize the image to the current image that PNG will be overlaying.
+ * We set the num_rows again here, in case it was incorrectly set in
+ * png_read_start_row() by a call to png_read_update_info() or
+ * png_start_read_image() if png_set_interlace_handling() wasn't called
+ * prior to either of these functions like it should have been.  You can
+ * only call this function once.  If you desire to have an image for
+ * each pass of a interlaced image, use png_read_rows() instead.
+ *
+ * [*] png_handle_alpha() does not exist yet, as of this version of libpng
+ */
+void PNGAPI
+png_read_image(png_structp png_ptr, png_bytepp image)
+{
+   png_uint_32 i, image_height;
+   int pass, j;
+   png_bytepp rp;
+
+   png_debug(1, "in png_read_image");
+ 
+   if (png_ptr == NULL)
+      return;
+
+#ifdef PNG_READ_INTERLACING_SUPPORTED
+   pass = png_set_interlace_handling(png_ptr);
+#else
+   if (png_ptr->interlaced)
+      png_error(png_ptr,
+        "Cannot read interlaced image -- interlace handler disabled.");
+   pass = 1;
+#endif
+
+
+   image_height=png_ptr->height;
+   png_ptr->num_rows = image_height; /* Make sure this is set correctly */
+
+   for (j = 0; j < pass; j++)
+   {
+      rp = image;
+      for (i = 0; i < image_height; i++)
+      {
+         png_read_row(png_ptr, *rp, png_bytep_NULL);
+         rp++;
+      }
+   }
+}
+#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
+
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
+/* Read the end of the PNG file.  Will not read past the end of the
+ * file, will verify the end is accurate, and will read any comments
+ * or time information at the end of the file, if info is not NULL.
+ */
+void PNGAPI
+png_read_end(png_structp png_ptr, png_infop info_ptr)
+{
+   png_debug(1, "in png_read_end");
+ 
+   if (png_ptr == NULL)
+      return;
+   png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */
+
+   do
+   {
+#ifdef PNG_USE_LOCAL_ARRAYS
+      PNG_CONST PNG_IHDR;
+      PNG_CONST PNG_IDAT;
+      PNG_CONST PNG_IEND;
+      PNG_CONST PNG_PLTE;
+#ifdef PNG_READ_bKGD_SUPPORTED
+      PNG_CONST PNG_bKGD;
+#endif
+#ifdef PNG_READ_cHRM_SUPPORTED
+      PNG_CONST PNG_cHRM;
+#endif
+#ifdef PNG_READ_gAMA_SUPPORTED
+      PNG_CONST PNG_gAMA;
+#endif
+#ifdef PNG_READ_hIST_SUPPORTED
+      PNG_CONST PNG_hIST;
+#endif
+#ifdef PNG_READ_iCCP_SUPPORTED
+      PNG_CONST PNG_iCCP;
+#endif
+#ifdef PNG_READ_iTXt_SUPPORTED
+      PNG_CONST PNG_iTXt;
+#endif
+#ifdef PNG_READ_oFFs_SUPPORTED
+      PNG_CONST PNG_oFFs;
+#endif
+#ifdef PNG_READ_pCAL_SUPPORTED
+      PNG_CONST PNG_pCAL;
+#endif
+#ifdef PNG_READ_pHYs_SUPPORTED
+      PNG_CONST PNG_pHYs;
+#endif
+#ifdef PNG_READ_sBIT_SUPPORTED
+      PNG_CONST PNG_sBIT;
+#endif
+#ifdef PNG_READ_sCAL_SUPPORTED
+      PNG_CONST PNG_sCAL;
+#endif
+#ifdef PNG_READ_sPLT_SUPPORTED
+      PNG_CONST PNG_sPLT;
+#endif
+#ifdef PNG_READ_sRGB_SUPPORTED
+      PNG_CONST PNG_sRGB;
+#endif
+#ifdef PNG_READ_tEXt_SUPPORTED
+      PNG_CONST PNG_tEXt;
+#endif
+#ifdef PNG_READ_tIME_SUPPORTED
+      PNG_CONST PNG_tIME;
+#endif
+#ifdef PNG_READ_tRNS_SUPPORTED
+      PNG_CONST PNG_tRNS;
+#endif
+#ifdef PNG_READ_zTXt_SUPPORTED
+      PNG_CONST PNG_zTXt;
+#endif
+#endif /* PNG_USE_LOCAL_ARRAYS */
+      png_uint_32 length = png_read_chunk_header(png_ptr);
+      PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;
+
+      if (!png_memcmp(chunk_name, png_IHDR, 4))
+         png_handle_IHDR(png_ptr, info_ptr, length);
+      else if (!png_memcmp(chunk_name, png_IEND, 4))
+         png_handle_IEND(png_ptr, info_ptr, length);
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+      else if (png_handle_as_unknown(png_ptr, chunk_name))
+      {
+         if (!png_memcmp(chunk_name, png_IDAT, 4))
+         {
+            if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
+               png_error(png_ptr, "Too many IDAT's found");
+         }
+         png_handle_unknown(png_ptr, info_ptr, length);
+         if (!png_memcmp(chunk_name, png_PLTE, 4))
+            png_ptr->mode |= PNG_HAVE_PLTE;
+      }
+#endif
+      else if (!png_memcmp(chunk_name, png_IDAT, 4))
+      {
+         /* Zero length IDATs are legal after the last IDAT has been
+          * read, but not after other chunks have been read.
+          */
+         if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
+            png_error(png_ptr, "Too many IDAT's found");
+         png_crc_finish(png_ptr, length);
+      }
+      else if (!png_memcmp(chunk_name, png_PLTE, 4))
+         png_handle_PLTE(png_ptr, info_ptr, length);
+#ifdef PNG_READ_bKGD_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_bKGD, 4))
+         png_handle_bKGD(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_cHRM_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_cHRM, 4))
+         png_handle_cHRM(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_gAMA_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_gAMA, 4))
+         png_handle_gAMA(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_hIST_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_hIST, 4))
+         png_handle_hIST(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_oFFs_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_oFFs, 4))
+         png_handle_oFFs(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_pCAL_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_pCAL, 4))
+         png_handle_pCAL(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_sCAL_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_sCAL, 4))
+         png_handle_sCAL(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_pHYs_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_pHYs, 4))
+         png_handle_pHYs(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_sBIT_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_sBIT, 4))
+         png_handle_sBIT(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_sRGB_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_sRGB, 4))
+         png_handle_sRGB(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_iCCP_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_iCCP, 4))
+         png_handle_iCCP(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_sPLT_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_sPLT, 4))
+         png_handle_sPLT(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_tEXt_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_tEXt, 4))
+         png_handle_tEXt(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_tIME_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_tIME, 4))
+         png_handle_tIME(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_tRNS_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_tRNS, 4))
+         png_handle_tRNS(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_zTXt_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_zTXt, 4))
+         png_handle_zTXt(png_ptr, info_ptr, length);
+#endif
+#ifdef PNG_READ_iTXt_SUPPORTED
+      else if (!png_memcmp(chunk_name, png_iTXt, 4))
+         png_handle_iTXt(png_ptr, info_ptr, length);
+#endif
+      else
+         png_handle_unknown(png_ptr, info_ptr, length);
+   } while (!(png_ptr->mode & PNG_HAVE_IEND));
+}
+#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
+
+/* Free all memory used by the read */
+void PNGAPI
+png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
+   png_infopp end_info_ptr_ptr)
+{
+   png_structp png_ptr = NULL;
+   png_infop info_ptr = NULL, end_info_ptr = NULL;
+#ifdef PNG_USER_MEM_SUPPORTED
+   png_free_ptr free_fn = NULL;
+   png_voidp mem_ptr = NULL;
+#endif
+
+   png_debug(1, "in png_destroy_read_struct");
+ 
+   if (png_ptr_ptr != NULL)
+      png_ptr = *png_ptr_ptr;
+   if (png_ptr == NULL)
+      return;
+
+#ifdef PNG_USER_MEM_SUPPORTED
+   free_fn = png_ptr->free_fn;
+   mem_ptr = png_ptr->mem_ptr;
+#endif
+
+   if (info_ptr_ptr != NULL)
+      info_ptr = *info_ptr_ptr;
+
+   if (end_info_ptr_ptr != NULL)
+      end_info_ptr = *end_info_ptr_ptr;
+
+   png_read_destroy(png_ptr, info_ptr, end_info_ptr);
+
+   if (info_ptr != NULL)
+   {
+#ifdef PNG_TEXT_SUPPORTED
+      png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, -1);
+#endif
+
+#ifdef PNG_USER_MEM_SUPPORTED
+      png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
+          (png_voidp)mem_ptr);
+#else
+      png_destroy_struct((png_voidp)info_ptr);
+#endif
+      *info_ptr_ptr = NULL;
+   }
+
+   if (end_info_ptr != NULL)
+   {
+#ifdef PNG_READ_TEXT_SUPPORTED
+      png_free_data(png_ptr, end_info_ptr, PNG_FREE_TEXT, -1);
+#endif
+#ifdef PNG_USER_MEM_SUPPORTED
+      png_destroy_struct_2((png_voidp)end_info_ptr, (png_free_ptr)free_fn,
+         (png_voidp)mem_ptr);
+#else
+      png_destroy_struct((png_voidp)end_info_ptr);
+#endif
+      *end_info_ptr_ptr = NULL;
+   }
+
+   if (png_ptr != NULL)
+   {
+#ifdef PNG_USER_MEM_SUPPORTED
+      png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,
+          (png_voidp)mem_ptr);
+#else
+      png_destroy_struct((png_voidp)png_ptr);
+#endif
+      *png_ptr_ptr = NULL;
+   }
+}
+
+/* Free all memory used by the read (old method) */
+void /* PRIVATE */
+png_read_destroy(png_structp png_ptr, png_infop info_ptr,
+    png_infop end_info_ptr)
+{
+#ifdef PNG_SETJMP_SUPPORTED
+   jmp_buf tmp_jmp;
+#endif
+   png_error_ptr error_fn;
+   png_error_ptr warning_fn;
+   png_voidp error_ptr;
+#ifdef PNG_USER_MEM_SUPPORTED
+   png_free_ptr free_fn;
+#endif
+
+   png_debug(1, "in png_read_destroy");
+ 
+   if (info_ptr != NULL)
+      png_info_destroy(png_ptr, info_ptr);
+
+   if (end_info_ptr != NULL)
+      png_info_destroy(png_ptr, end_info_ptr);
+
+   png_free(png_ptr, png_ptr->zbuf);
+   png_free(png_ptr, png_ptr->big_row_buf);
+   png_free(png_ptr, png_ptr->prev_row);
+   png_free(png_ptr, png_ptr->chunkdata);
+#ifdef PNG_READ_DITHER_SUPPORTED
+   png_free(png_ptr, png_ptr->palette_lookup);
+   png_free(png_ptr, png_ptr->dither_index);
+#endif
+#ifdef PNG_READ_GAMMA_SUPPORTED
+   png_free(png_ptr, png_ptr->gamma_table);
+#endif
+#ifdef PNG_READ_BACKGROUND_SUPPORTED
+   png_free(png_ptr, png_ptr->gamma_from_1);
+   png_free(png_ptr, png_ptr->gamma_to_1);
+#endif
+#ifdef PNG_FREE_ME_SUPPORTED
+   if (png_ptr->free_me & PNG_FREE_PLTE)
+      png_zfree(png_ptr, png_ptr->palette);
+   png_ptr->free_me &= ~PNG_FREE_PLTE;
+#else
+   if (png_ptr->flags & PNG_FLAG_FREE_PLTE)
+      png_zfree(png_ptr, png_ptr->palette);
+   png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
+#endif
+#if defined(PNG_tRNS_SUPPORTED) || \
+    defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
+#ifdef PNG_FREE_ME_SUPPORTED
+   if (png_ptr->free_me & PNG_FREE_TRNS)
+      png_free(png_ptr, png_ptr->trans);
+   png_ptr->free_me &= ~PNG_FREE_TRNS;
+#else
+   if (png_ptr->flags & PNG_FLAG_FREE_TRNS)
+      png_free(png_ptr, png_ptr->trans);
+   png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
+#endif
+#endif
+#ifdef PNG_READ_hIST_SUPPORTED
+#ifdef PNG_FREE_ME_SUPPORTED
+   if (png_ptr->free_me & PNG_FREE_HIST)
+      png_free(png_ptr, png_ptr->hist);
+   png_ptr->free_me &= ~PNG_FREE_HIST;
+#else
+   if (png_ptr->flags & PNG_FLAG_FREE_HIST)
+      png_free(png_ptr, png_ptr->hist);
+   png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
+#endif
+#endif
+#ifdef PNG_READ_GAMMA_SUPPORTED
+   if (png_ptr->gamma_16_table != NULL)
+   {
+      int i;
+      int istop = (1 << (8 - png_ptr->gamma_shift));
+      for (i = 0; i < istop; i++)
+      {
+         png_free(png_ptr, png_ptr->gamma_16_table[i]);
+      }
+   png_free(png_ptr, png_ptr->gamma_16_table);
+   }
+#ifdef PNG_READ_BACKGROUND_SUPPORTED
+   if (png_ptr->gamma_16_from_1 != NULL)
+   {
+      int i;
+      int istop = (1 << (8 - png_ptr->gamma_shift));
+      for (i = 0; i < istop; i++)
+      {
+         png_free(png_ptr, png_ptr->gamma_16_from_1[i]);
+      }
+   png_free(png_ptr, png_ptr->gamma_16_from_1);
+   }
+   if (png_ptr->gamma_16_to_1 != NULL)
+   {
+      int i;
+      int istop = (1 << (8 - png_ptr->gamma_shift));
+      for (i = 0; i < istop; i++)
+      {
+         png_free(png_ptr, png_ptr->gamma_16_to_1[i]);
+      }
+   png_free(png_ptr, png_ptr->gamma_16_to_1);
+   }
+#endif
+#endif
+#ifdef PNG_TIME_RFC1123_SUPPORTED
+   png_free(png_ptr, png_ptr->time_buffer);
+#endif
+
+   inflateEnd(&png_ptr->zstream);
+#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
+   png_free(png_ptr, png_ptr->save_buffer);
+#endif
+
+#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
+#ifdef PNG_TEXT_SUPPORTED
+   png_free(png_ptr, png_ptr->current_text);
+#endif /* PNG_TEXT_SUPPORTED */
+#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
+
+   /* Save the important info out of the png_struct, in case it is
+    * being used again.
+    */
+#ifdef PNG_SETJMP_SUPPORTED
+   png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
+#endif
+
+   error_fn = png_ptr->error_fn;
+   warning_fn = png_ptr->warning_fn;
+   error_ptr = png_ptr->error_ptr;
+#ifdef PNG_USER_MEM_SUPPORTED
+   free_fn = png_ptr->free_fn;
+#endif
+
+   png_memset(png_ptr, 0, png_sizeof(png_struct));
+
+   png_ptr->error_fn = error_fn;
+   png_ptr->warning_fn = warning_fn;
+   png_ptr->error_ptr = error_ptr;
+#ifdef PNG_USER_MEM_SUPPORTED
+   png_ptr->free_fn = free_fn;
+#endif
+
+#ifdef PNG_SETJMP_SUPPORTED
+   png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
+#endif
+
+}
+
+void PNGAPI
+png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn)
+{
+   if (png_ptr == NULL)
+      return;
+   png_ptr->read_row_fn = read_row_fn;
+}
+
+
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
+#ifdef PNG_INFO_IMAGE_SUPPORTED
+void PNGAPI
+png_read_png(png_structp png_ptr, png_infop info_ptr,
+                           int transforms,
+                           voidp params)
+{
+   int row;
+
+   if (png_ptr == NULL)
+      return;
+#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
+   /* Invert the alpha channel from opacity to transparency
+    */
+   if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
+       png_set_invert_alpha(png_ptr);
+#endif
+
+   /* png_read_info() gives us all of the information from the
+    * PNG file before the first IDAT (image data chunk).
+    */
+   png_read_info(png_ptr, info_ptr);
+   if (info_ptr->height > PNG_UINT_32_MAX/png_sizeof(png_bytep))
+      png_error(png_ptr, "Image is too high to process with png_read_png()");
+
+   /* -------------- image transformations start here ------------------- */
+
+#ifdef PNG_READ_16_TO_8_SUPPORTED
+   /* Tell libpng to strip 16 bit/color files down to 8 bits per color.
+    */
+   if (transforms & PNG_TRANSFORM_STRIP_16)
+      png_set_strip_16(png_ptr);
+#endif
+
+#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
+   /* Strip alpha bytes from the input data without combining with
+    * the background (not recommended).
+    */
+   if (transforms & PNG_TRANSFORM_STRIP_ALPHA)
+      png_set_strip_alpha(png_ptr);
+#endif
+
+#if defined(PNG_READ_PACK_SUPPORTED) && !defined(PNG_READ_EXPAND_SUPPORTED)
+   /* Extract multiple pixels with bit depths of 1, 2, or 4 from a single
+    * byte into separate bytes (useful for paletted and grayscale images).
+    */
+   if (transforms & PNG_TRANSFORM_PACKING)
+      png_set_packing(png_ptr);
+#endif
+
+#ifdef PNG_READ_PACKSWAP_SUPPORTED
+   /* Change the order of packed pixels to least significant bit first
+    * (not useful if you are using png_set_packing).
+    */
+   if (transforms & PNG_TRANSFORM_PACKSWAP)
+      png_set_packswap(png_ptr);
+#endif
+
+#ifdef PNG_READ_EXPAND_SUPPORTED
+   /* Expand paletted colors into true RGB triplets
+    * Expand grayscale images to full 8 bits from 1, 2, or 4 bits/pixel
+    * Expand paletted or RGB images with transparency to full alpha
+    * channels so the data will be available as RGBA quartets.
+    */
+   if (transforms & PNG_TRANSFORM_EXPAND)
+      if ((png_ptr->bit_depth < 8) ||
+          (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ||
+          (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)))
+         png_set_expand(png_ptr);
+#endif
+
+   /* We don't handle background color or gamma transformation or dithering.
+    */
+
+#ifdef PNG_READ_INVERT_SUPPORTED
+   /* Invert monochrome files to have 0 as white and 1 as black
+    */
+   if (transforms & PNG_TRANSFORM_INVERT_MONO)
+      png_set_invert_mono(png_ptr);
+#endif
+
+#ifdef PNG_READ_SHIFT_SUPPORTED
+   /* If you want to shift the pixel values from the range [0,255] or
+    * [0,65535] to the original [0,7] or [0,31], or whatever range the
+    * colors were originally in:
+    */
+   if ((transforms & PNG_TRANSFORM_SHIFT)
+       && png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT))
+   {
+      png_color_8p sig_bit;
+
+      png_get_sBIT(png_ptr, info_ptr, &sig_bit);
+      png_set_shift(png_ptr, sig_bit);
+   }
+#endif
+
+#ifdef PNG_READ_BGR_SUPPORTED
+   /* Flip the RGB pixels to BGR (or RGBA to BGRA)
+    */
+   if (transforms & PNG_TRANSFORM_BGR)
+      png_set_bgr(png_ptr);
+#endif
+
+#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED
+   /* Swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR)
+    */
+   if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
+       png_set_swap_alpha(png_ptr);
+#endif
+
+#ifdef PNG_READ_SWAP_SUPPORTED
+   /* Swap bytes of 16 bit files to least significant byte first
+    */
+   if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
+      png_set_swap(png_ptr);
+#endif
+
+/* Added at libpng-1.2.41 */
+#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
+   /* Invert the alpha channel from opacity to transparency
+    */
+   if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
+       png_set_invert_alpha(png_ptr);
+#endif
+
+/* Added at libpng-1.2.41 */
+#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
+   /* Expand grayscale image to RGB
+    */
+   if (transforms & PNG_TRANSFORM_GRAY_TO_RGB)
+       png_set_gray_to_rgb(png_ptr);
+#endif
+
+   /* We don't handle adding filler bytes */
+
+   /* Optional call to gamma correct and add the background to the palette
+    * and update info structure.  REQUIRED if you are expecting libpng to
+    * update the palette for you (i.e., you selected such a transform above).
+    */
+   png_read_update_info(png_ptr, info_ptr);
+
+   /* -------------- image transformations end here ------------------- */
+
+#ifdef PNG_FREE_ME_SUPPORTED
+   png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
+#endif
+   if (info_ptr->row_pointers == NULL)
+   {
+      info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr,
+         info_ptr->height * png_sizeof(png_bytep));
+      png_memset(info_ptr->row_pointers, 0, info_ptr->height
+         * png_sizeof(png_bytep));
+
+#ifdef PNG_FREE_ME_SUPPORTED
+      info_ptr->free_me |= PNG_FREE_ROWS;
+#endif
+
+      for (row = 0; row < (int)info_ptr->height; row++)
+         info_ptr->row_pointers[row] = (png_bytep)png_malloc(png_ptr,
+            png_get_rowbytes(png_ptr, info_ptr));
+   }
+
+   png_read_image(png_ptr, info_ptr->row_pointers);
+   info_ptr->valid |= PNG_INFO_IDAT;
+
+   /* Read rest of file, and get additional chunks in info_ptr - REQUIRED */
+   png_read_end(png_ptr, info_ptr);
+
+   transforms = transforms; /* Quiet compiler warnings */
+   params = params;
+
+}
+#endif /* PNG_INFO_IMAGE_SUPPORTED */
+#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
+#endif /* PNG_READ_SUPPORTED */
diff --git a/src/libpng/pngrio.c b/src/libpng/pngrio.c
new file mode 100644
index 0000000..6978682
--- /dev/null
+++ b/src/libpng/pngrio.c
@@ -0,0 +1,180 @@
+
+/* pngrio.c - functions for data input
+ *
+ * Last changed in libpng 1.2.43 [February 25, 2010]
+ * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
+ * This file provides a location for all input.  Users who need
+ * special handling are expected to write a function that has the same
+ * arguments as this and performs a similar function, but that possibly
+ * has a different input method.  Note that you shouldn't change this
+ * function, but rather write a replacement function and then make
+ * libpng use it at run time with png_set_read_fn(...).
+ */
+
+#define PNG_INTERNAL
+#define PNG_NO_PEDANTIC_WARNINGS
+#include "png.h"
+#ifdef PNG_READ_SUPPORTED
+
+/* Read the data from whatever input you are using.  The default routine
+ * reads from a file pointer.  Note that this routine sometimes gets called
+ * with very small lengths, so you should implement some kind of simple
+ * buffering if you are using unbuffered reads.  This should never be asked
+ * to read more then 64K on a 16 bit machine.
+ */
+void /* PRIVATE */
+png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
+{
+   png_debug1(4, "reading %d bytes", (int)length);
+ 
+   if (png_ptr->read_data_fn != NULL)
+      (*(png_ptr->read_data_fn))(png_ptr, data, length);
+   else
+      png_error(png_ptr, "Call to NULL read function");
+}
+
+#ifdef PNG_STDIO_SUPPORTED
+/* This is the function that does the actual reading of data.  If you are
+ * not reading from a standard C stream, you should create a replacement
+ * read_data function and use it at run time with png_set_read_fn(), rather
+ * than changing the library.
+ */
+#ifndef USE_FAR_KEYWORD
+void PNGAPI
+png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
+{
+   png_size_t check;
+
+   if (png_ptr == NULL)
+      return;
+   /* fread() returns 0 on error, so it is OK to store this in a png_size_t
+    * instead of an int, which is what fread() actually returns.
+    */
+#ifdef _WIN32_WCE
+   if ( !ReadFile((HANDLE)(png_ptr->io_ptr), data, length, &check, NULL) )
+      check = 0;
+#else
+   check = (png_size_t)fread(data, (png_size_t)1, length,
+      (png_FILE_p)png_ptr->io_ptr);
+#endif
+
+   if (check != length)
+      png_error(png_ptr, "Read Error");
+}
+#else
+/* This is the model-independent version. Since the standard I/O library
+   can't handle far buffers in the medium and small models, we have to copy
+   the data.
+*/
+
+#define NEAR_BUF_SIZE 1024
+#define MIN(a,b) (a <= b ? a : b)
+
+static void PNGAPI
+png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
+{
+   int check;
+   png_byte *n_data;
+   png_FILE_p io_ptr;
+
+   if (png_ptr == NULL)
+      return;
+   /* Check if data really is near. If so, use usual code. */
+   n_data = (png_byte *)CVT_PTR_NOCHECK(data);
+   io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
+   if ((png_bytep)n_data == data)
+   {
+#ifdef _WIN32_WCE
+      if ( !ReadFile((HANDLE)(png_ptr->io_ptr), data, length, &check,
+          NULL) )
+         check = 0;
+#else
+      check = fread(n_data, 1, length, io_ptr);
+#endif
+   }
+   else
+   {
+      png_byte buf[NEAR_BUF_SIZE];
+      png_size_t read, remaining, err;
+      check = 0;
+      remaining = length;
+      do
+      {
+         read = MIN(NEAR_BUF_SIZE, remaining);
+#ifdef _WIN32_WCE
+         if ( !ReadFile((HANDLE)(io_ptr), buf, read, &err, NULL) )
+            err = 0;
+#else
+         err = fread(buf, (png_size_t)1, read, io_ptr);
+#endif
+         png_memcpy(data, buf, read); /* copy far buffer to near buffer */
+         if (err != read)
+            break;
+         else
+            check += err;
+         data += read;
+         remaining -= read;
+      }
+      while (remaining != 0);
+   }
+   if ((png_uint_32)check != (png_uint_32)length)
+      png_error(png_ptr, "read Error");
+}
+#endif
+#endif
+
+/* This function allows the application to supply a new input function
+ * for libpng if standard C streams aren't being used.
+ *
+ * This function takes as its arguments:
+ * png_ptr      - pointer to a png input data structure
+ * io_ptr       - pointer to user supplied structure containing info about
+ *                the input functions.  May be NULL.
+ * read_data_fn - pointer to a new input function that takes as its
+ *                arguments a pointer to a png_struct, a pointer to
+ *                a location where input data can be stored, and a 32-bit
+ *                unsigned int that is the number of bytes to be read.
+ *                To exit and output any fatal error messages the new write
+ *                function should call png_error(png_ptr, "Error msg").
+ *                May be NULL, in which case libpng's default function will
+ *                be used.
+ */
+void PNGAPI
+png_set_read_fn(png_structp png_ptr, png_voidp io_ptr,
+   png_rw_ptr read_data_fn)
+{
+   if (png_ptr == NULL)
+      return;
+   png_ptr->io_ptr = io_ptr;
+
+#ifdef PNG_STDIO_SUPPORTED
+   if (read_data_fn != NULL)
+      png_ptr->read_data_fn = read_data_fn;
+   else
+      png_ptr->read_data_fn = png_default_read_data;
+#else
+   png_ptr->read_data_fn = read_data_fn;
+#endif
+
+   /* It is an error to write to a read device */
+   if (png_ptr->write_data_fn != NULL)
+   {
+      png_ptr->write_data_fn = NULL;
+      png_warning(png_ptr,
+         "It's an error to set both read_data_fn and write_data_fn in the ");
+      png_warning(png_ptr,
+         "same structure.  Resetting write_data_fn to NULL.");
+   }
+
+#ifdef PNG_WRITE_FLUSH_SUPPORTED
+   png_ptr->output_flush_fn = NULL;
+#endif
+}
+#endif /* PNG_READ_SUPPORTED */
diff --git a/src/libpng/pngrtran.c b/src/libpng/pngrtran.c
new file mode 100644
index 0000000..33703d4
--- /dev/null
+++ b/src/libpng/pngrtran.c
@@ -0,0 +1,4467 @@
+
+/* pngrtran.c - transforms the data in a row for PNG readers
+ *
+ * Last changed in libpng 1.2.45 [July 7, 2011]
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
+ * This file contains functions optionally called by an application
+ * in order to tell libpng how to handle data when reading a PNG.
+ * Transformations that are used in both reading and writing are
+ * in pngtrans.c.
+ */
+
+#define PNG_INTERNAL
+#define PNG_NO_PEDANTIC_WARNINGS
+#include "png.h"
+#ifdef PNG_READ_SUPPORTED
+
+/* Set the action on getting a CRC error for an ancillary or critical chunk. */
+void PNGAPI
+png_set_crc_action(png_structp png_ptr, int crit_action, int ancil_action)
+{
+   png_debug(1, "in png_set_crc_action");
+ 
+   if (png_ptr == NULL)
+      return;
+
+   /* Tell libpng how we react to CRC errors in critical chunks */
+   switch (crit_action)
+   {
+      case PNG_CRC_NO_CHANGE:                        /* Leave setting as is */
+         break;
+
+      case PNG_CRC_WARN_USE:                               /* Warn/use data */
+         png_ptr->flags &= ~PNG_FLAG_CRC_CRITICAL_MASK;
+         png_ptr->flags |= PNG_FLAG_CRC_CRITICAL_USE;
+         break;
+
+      case PNG_CRC_QUIET_USE:                             /* Quiet/use data */
+         png_ptr->flags &= ~PNG_FLAG_CRC_CRITICAL_MASK;
+         png_ptr->flags |= PNG_FLAG_CRC_CRITICAL_USE |
+                           PNG_FLAG_CRC_CRITICAL_IGNORE;
+         break;
+
+      case PNG_CRC_WARN_DISCARD:    /* Not a valid action for critical data */
+         png_warning(png_ptr,
+            "Can't discard critical data on CRC error.");
+      case PNG_CRC_ERROR_QUIT:                                /* Error/quit */
+
+      case PNG_CRC_DEFAULT:
+      default:
+         png_ptr->flags &= ~PNG_FLAG_CRC_CRITICAL_MASK;
+         break;
+   }
+
+   /* Tell libpng how we react to CRC errors in ancillary chunks */
+   switch (ancil_action)
+   {
+      case PNG_CRC_NO_CHANGE:                       /* Leave setting as is */
+         break;
+
+      case PNG_CRC_WARN_USE:                              /* Warn/use data */
+         png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK;
+         png_ptr->flags |= PNG_FLAG_CRC_ANCILLARY_USE;
+         break;
+
+      case PNG_CRC_QUIET_USE:                            /* Quiet/use data */
+         png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK;
+         png_ptr->flags |= PNG_FLAG_CRC_ANCILLARY_USE |
+                           PNG_FLAG_CRC_ANCILLARY_NOWARN;
+         break;
+
+      case PNG_CRC_ERROR_QUIT:                               /* Error/quit */
+         png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK;
+         png_ptr->flags |= PNG_FLAG_CRC_ANCILLARY_NOWARN;
+         break;
+
+      case PNG_CRC_WARN_DISCARD:                      /* Warn/discard data */
+
+      case PNG_CRC_DEFAULT:
+      default:
+         png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK;
+         break;
+   }
+}
+
+#if defined(PNG_READ_BACKGROUND_SUPPORTED) && \
+    defined(PNG_FLOATING_POINT_SUPPORTED)
+/* Handle alpha and tRNS via a background color */
+void PNGAPI
+png_set_background(png_structp png_ptr,
+   png_color_16p background_color, int background_gamma_code,
+   int need_expand, double background_gamma)
+{
+   png_debug(1, "in png_set_background");
+ 
+   if (png_ptr == NULL)
+      return;
+   if (background_gamma_code == PNG_BACKGROUND_GAMMA_UNKNOWN)
+   {
+      png_warning(png_ptr, "Application must supply a known background gamma");
+      return;
+   }
+
+   png_ptr->transformations |= PNG_BACKGROUND;
+   png_memcpy(&(png_ptr->background), background_color,
+      png_sizeof(png_color_16));
+   png_ptr->background_gamma = (float)background_gamma;
+   png_ptr->background_gamma_type = (png_byte)(background_gamma_code);
+   png_ptr->transformations |= (need_expand ? PNG_BACKGROUND_EXPAND : 0);
+}
+#endif
+
+#ifdef PNG_READ_16_TO_8_SUPPORTED
+/* Strip 16 bit depth files to 8 bit depth */
+void PNGAPI
+png_set_strip_16(png_structp png_ptr)
+{
+   png_debug(1, "in png_set_strip_16");
+
+   if (png_ptr == NULL)
+      return;
+   png_ptr->transformations |= PNG_16_TO_8;
+}
+#endif
+
+#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
+void PNGAPI
+png_set_strip_alpha(png_structp png_ptr)
+{
+   png_debug(1, "in png_set_strip_alpha");
+
+   if (png_ptr == NULL)
+      return;
+   png_ptr->flags |= PNG_FLAG_STRIP_ALPHA;
+}
+#endif
+
+#ifdef PNG_READ_DITHER_SUPPORTED
+/* Dither file to 8 bit.  Supply a palette, the current number
+ * of elements in the palette, the maximum number of elements
+ * allowed, and a histogram if possible.  If the current number
+ * of colors is greater then the maximum number, the palette will be
+ * modified to fit in the maximum number.  "full_dither" indicates
+ * whether we need a dithering cube set up for RGB images, or if we
+ * simply are reducing the number of colors in a paletted image.
+ */
+
+typedef struct png_dsort_struct
+{
+   struct png_dsort_struct FAR * next;
+   png_byte left;
+   png_byte right;
+} png_dsort;
+typedef png_dsort FAR *       png_dsortp;
+typedef png_dsort FAR * FAR * png_dsortpp;
+
+void PNGAPI
+png_set_dither(png_structp png_ptr, png_colorp palette,
+   int num_palette, int maximum_colors, png_uint_16p histogram,
+   int full_dither)
+{
+   png_debug(1, "in png_set_dither");
+
+   if (png_ptr == NULL)
+      return;
+   png_ptr->transformations |= PNG_DITHER;
+
+   if (!full_dither)
+   {
+      int i;
+
+      png_ptr->dither_index = (png_bytep)png_malloc(png_ptr,
+         (png_uint_32)(num_palette * png_sizeof(png_byte)));
+      for (i = 0; i < num_palette; i++)
+         png_ptr->dither_index[i] = (png_byte)i;
+   }
+
+   if (num_palette > maximum_colors)
+   {
+      if (histogram != NULL)
+      {
+         /* This is easy enough, just throw out the least used colors.
+          * Perhaps not the best solution, but good enough.
+          */
+
+         int i;
+
+         /* Initialize an array to sort colors */
+         png_ptr->dither_sort = (png_bytep)png_malloc(png_ptr,
+            (png_uint_32)(num_palette * png_sizeof(png_byte)));
+
+         /* Initialize the dither_sort array */
+         for (i = 0; i < num_palette; i++)
+            png_ptr->dither_sort[i] = (png_byte)i;
+
+         /* Find the least used palette entries by starting a
+          * bubble sort, and running it until we have sorted
+          * out enough colors.  Note that we don't care about
+          * sorting all the colors, just finding which are
+          * least used.
+          */
+
+         for (i = num_palette - 1; i >= maximum_colors; i--)
+         {
+            int done; /* To stop early if the list is pre-sorted */
+            int j;
+
+            done = 1;
+            for (j = 0; j < i; j++)
+            {
+               if (histogram[png_ptr->dither_sort[j]]
+                   < histogram[png_ptr->dither_sort[j + 1]])
+               {
+                  png_byte t;
+
+                  t = png_ptr->dither_sort[j];
+                  png_ptr->dither_sort[j] = png_ptr->dither_sort[j + 1];
+                  png_ptr->dither_sort[j + 1] = t;
+                  done = 0;
+               }
+            }
+            if (done)
+               break;
+         }
+
+         /* Swap the palette around, and set up a table, if necessary */
+         if (full_dither)
+         {
+            int j = num_palette;
+
+            /* Put all the useful colors within the max, but don't
+             * move the others.
+             */
+            for (i = 0; i < maximum_colors; i++)
+            {
+               if ((int)png_ptr->dither_sort[i] >= maximum_colors)
+               {
+                  do
+                     j--;
+                  while ((int)png_ptr->dither_sort[j] >= maximum_colors);
+                  palette[i] = palette[j];
+               }
+            }
+         }
+         else
+         {
+            int j = num_palette;
+
+            /* Move all the used colors inside the max limit, and
+             * develop a translation table.
+             */
+            for (i = 0; i < maximum_colors; i++)
+            {
+               /* Only move the colors we need to */
+               if ((int)png_ptr->dither_sort[i] >= maximum_colors)
+               {
+                  png_color tmp_color;
+
+                  do
+                     j--;
+                  while ((int)png_ptr->dither_sort[j] >= maximum_colors);
+
+                  tmp_color = palette[j];
+                  palette[j] = palette[i];
+                  palette[i] = tmp_color;
+                  /* Indicate where the color went */
+                  png_ptr->dither_index[j] = (png_byte)i;
+                  png_ptr->dither_index[i] = (png_byte)j;
+               }
+            }
+
+            /* Find closest color for those colors we are not using */
+            for (i = 0; i < num_palette; i++)
+            {
+               if ((int)png_ptr->dither_index[i] >= maximum_colors)
+               {
+                  int min_d, k, min_k, d_index;
+
+                  /* Find the closest color to one we threw out */
+                  d_index = png_ptr->dither_index[i];
+                  min_d = PNG_COLOR_DIST(palette[d_index], palette[0]);
+                  for (k = 1, min_k = 0; k < maximum_colors; k++)
+                  {
+                     int d;
+
+                     d = PNG_COLOR_DIST(palette[d_index], palette[k]);
+
+                     if (d < min_d)
+                     {
+                        min_d = d;
+                        min_k = k;
+                     }
+                  }
+                  /* Point to closest color */
+                  png_ptr->dither_index[i] = (png_byte)min_k;
+               }
+            }
+         }
+         png_free(png_ptr, png_ptr->dither_sort);
+         png_ptr->dither_sort = NULL;
+      }
+      else
+      {
+         /* This is much harder to do simply (and quickly).  Perhaps
+          * we need to go through a median cut routine, but those
+          * don't always behave themselves with only a few colors
+          * as input.  So we will just find the closest two colors,
+          * and throw out one of them (chosen somewhat randomly).
+          * [We don't understand this at all, so if someone wants to
+          *  work on improving it, be our guest - AED, GRP]
+          */
+         int i;
+         int max_d;
+         int num_new_palette;
+         png_dsortp t;
+         png_dsortpp hash;
+
+         t = NULL;
+
+         /* Initialize palette index arrays */
+         png_ptr->index_to_palette = (png_bytep)png_malloc(png_ptr,
+            (png_uint_32)(num_palette * png_sizeof(png_byte)));
+         png_ptr->palette_to_index = (png_bytep)png_malloc(png_ptr,
+            (png_uint_32)(num_palette * png_sizeof(png_byte)));
+
+         /* Initialize the sort array */
+         for (i = 0; i < num_palette; i++)
+         {
+            png_ptr->index_to_palette[i] = (png_byte)i;
+            png_ptr->palette_to_index[i] = (png_byte)i;
+         }
+
+         hash = (png_dsortpp)png_calloc(png_ptr, (png_uint_32)(769 *
+            png_sizeof(png_dsortp)));
+
+         num_new_palette = num_palette;
+
+         /* Initial wild guess at how far apart the farthest pixel
+          * pair we will be eliminating will be.  Larger
+          * numbers mean more areas will be allocated, Smaller
+          * numbers run the risk of not saving enough data, and
+          * having to do this all over again.
+          *
+          * I have not done extensive checking on this number.
+          */
+         max_d = 96;
+
+         while (num_new_palette > maximum_colors)
+         {
+            for (i = 0; i < num_new_palette - 1; i++)
+            {
+               int j;
+
+               for (j = i + 1; j < num_new_palette; j++)
+               {
+                  int d;
+
+                  d = PNG_COLOR_DIST(palette[i], palette[j]);
+
+                  if (d <= max_d)
+                  {
+
+                     t = (png_dsortp)png_malloc_warn(png_ptr,
+                         (png_uint_32)(png_sizeof(png_dsort)));
+                     if (t == NULL)
+                         break;
+                     t->next = hash[d];
+                     t->left = (png_byte)i;
+                     t->right = (png_byte)j;
+                     hash[d] = t;
+                  }
+               }
+               if (t == NULL)
+                  break;
+            }
+
+            if (t != NULL)
+            for (i = 0; i <= max_d; i++)
+            {
+               if (hash[i] != NULL)
+               {
+                  png_dsortp p;
+
+                  for (p = hash[i]; p; p = p->next)
+                  {
+                     if ((int)png_ptr->index_to_palette[p->left]
+                        < num_new_palette &&
+                        (int)png_ptr->index_to_palette[p->right]
+                        < num_new_palette)
+                     {
+                        int j, next_j;
+
+                        if (num_new_palette & 0x01)
+                        {
+                           j = p->left;
+                           next_j = p->right;
+                        }
+                        else
+                        {
+                           j = p->right;
+                           next_j = p->left;
+                        }
+
+                        num_new_palette--;
+                        palette[png_ptr->index_to_palette[j]]
+                          = palette[num_new_palette];
+                        if (!full_dither)
+                        {
+                           int k;
+
+                           for (k = 0; k < num_palette; k++)
+                           {
+                              if (png_ptr->dither_index[k] ==
+                                 png_ptr->index_to_palette[j])
+                                 png_ptr->dither_index[k] =
+                                    png_ptr->index_to_palette[next_j];
+                              if ((int)png_ptr->dither_index[k] ==
+                                 num_new_palette)
+                                 png_ptr->dither_index[k] =
+                                    png_ptr->index_to_palette[j];
+                           }
+                        }
+
+                        png_ptr->index_to_palette[png_ptr->palette_to_index
+                           [num_new_palette]] = png_ptr->index_to_palette[j];
+                        png_ptr->palette_to_index[png_ptr->index_to_palette[j]]
+                           = png_ptr->palette_to_index[num_new_palette];
+
+                        png_ptr->index_to_palette[j] =
+                            (png_byte)num_new_palette;
+                        png_ptr->palette_to_index[num_new_palette] =
+                            (png_byte)j;
+                     }
+                     if (num_new_palette <= maximum_colors)
+                        break;
+                  }
+                  if (num_new_palette <= maximum_colors)
+                     break;
+               }
+            }
+
+            for (i = 0; i < 769; i++)
+            {
+               if (hash[i] != NULL)
+               {
+                  png_dsortp p = hash[i];
+                  while (p)
+                  {
+                     t = p->next;
+                     png_free(png_ptr, p);
+                     p = t;
+                  }
+               }
+               hash[i] = 0;
+            }
+            max_d += 96;
+         }
+         png_free(png_ptr, hash);
+         png_free(png_ptr, png_ptr->palette_to_index);
+         png_free(png_ptr, png_ptr->index_to_palette);
+         png_ptr->palette_to_index = NULL;
+         png_ptr->index_to_palette = NULL;
+      }
+      num_palette = maximum_colors;
+   }
+   if (png_ptr->palette == NULL)
+   {
+      png_ptr->palette = palette;
+   }
+   png_ptr->num_palette = (png_uint_16)num_palette;
+
+   if (full_dither)
+   {
+      int i;
+      png_bytep distance;
+      int total_bits = PNG_DITHER_RED_BITS + PNG_DITHER_GREEN_BITS +
+         PNG_DITHER_BLUE_BITS;
+      int num_red = (1 << PNG_DITHER_RED_BITS);
+      int num_green = (1 << PNG_DITHER_GREEN_BITS);
+      int num_blue = (1 << PNG_DITHER_BLUE_BITS);
+      png_size_t num_entries = ((png_size_t)1 << total_bits);
+
+      png_ptr->palette_lookup = (png_bytep )png_calloc(png_ptr,
+         (png_uint_32)(num_entries * png_sizeof(png_byte)));
+
+      distance = (png_bytep)png_malloc(png_ptr, (png_uint_32)(num_entries *
+         png_sizeof(png_byte)));
+      png_memset(distance, 0xff, num_entries * png_sizeof(png_byte));
+
+      for (i = 0; i < num_palette; i++)
+      {
+         int ir, ig, ib;
+         int r = (palette[i].red >> (8 - PNG_DITHER_RED_BITS));
+         int g = (palette[i].green >> (8 - PNG_DITHER_GREEN_BITS));
+         int b = (palette[i].blue >> (8 - PNG_DITHER_BLUE_BITS));
+
+         for (ir = 0; ir < num_red; ir++)
+         {
+            /* int dr = abs(ir - r); */
+            int dr = ((ir > r) ? ir - r : r - ir);
+            int index_r = (ir << (PNG_DITHER_BLUE_BITS +
+                PNG_DITHER_GREEN_BITS));
+
+            for (ig = 0; ig < num_green; ig++)
+            {
+               /* int dg = abs(ig - g); */
+               int dg = ((ig > g) ? ig - g : g - ig);
+               int dt = dr + dg;
+               int dm = ((dr > dg) ? dr : dg);
+               int index_g = index_r | (ig << PNG_DITHER_BLUE_BITS);
+
+               for (ib = 0; ib < num_blue; ib++)
+               {
+                  int d_index = index_g | ib;
+                  /* int db = abs(ib - b); */
+                  int db = ((ib > b) ? ib - b : b - ib);
+                  int dmax = ((dm > db) ? dm : db);
+                  int d = dmax + dt + db;
+
+                  if (d < (int)distance[d_index])
+                  {
+                     distance[d_index] = (png_byte)d;
+                     png_ptr->palette_lookup[d_index] = (png_byte)i;
+                  }
+               }
+            }
+         }
+      }
+
+      png_free(png_ptr, distance);
+   }
+}
+#endif
+
+#if defined(PNG_READ_GAMMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
+/* Transform the image from the file_gamma to the screen_gamma.  We
+ * only do transformations on images where the file_gamma and screen_gamma
+ * are not close reciprocals, otherwise it slows things down slightly, and
+ * also needlessly introduces small errors.
+ *
+ * We will turn off gamma transformation later if no semitransparent entries
+ * are present in the tRNS array for palette images.  We can't do it here
+ * because we don't necessarily have the tRNS chunk yet.
+ */
+void PNGAPI
+png_set_gamma(png_structp png_ptr, double scrn_gamma, double file_gamma)
+{
+   png_debug(1, "in png_set_gamma");
+
+   if (png_ptr == NULL)
+      return;
+
+   if ((fabs(scrn_gamma * file_gamma - 1.0) > PNG_GAMMA_THRESHOLD) ||
+       (png_ptr->color_type & PNG_COLOR_MASK_ALPHA) ||
+       (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE))
+     png_ptr->transformations |= PNG_GAMMA;
+   png_ptr->gamma = (float)file_gamma;
+   png_ptr->screen_gamma = (float)scrn_gamma;
+}
+#endif
+
+#ifdef PNG_READ_EXPAND_SUPPORTED
+/* Expand paletted images to RGB, expand grayscale images of
+ * less than 8-bit depth to 8-bit depth, and expand tRNS chunks
+ * to alpha channels.
+ */
+void PNGAPI
+png_set_expand(png_structp png_ptr)
+{
+   png_debug(1, "in png_set_expand");
+
+   if (png_ptr == NULL)
+      return;
+
+   png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS);
+   png_ptr->flags &= ~PNG_FLAG_ROW_INIT;
+}
+
+/* GRR 19990627:  the following three functions currently are identical
+ *  to png_set_expand().  However, it is entirely reasonable that someone
+ *  might wish to expand an indexed image to RGB but *not* expand a single,
+ *  fully transparent palette entry to a full alpha channel--perhaps instead
+ *  convert tRNS to the grayscale/RGB format (16-bit RGB value), or replace
+ *  the transparent color with a particular RGB value, or drop tRNS entirely.
+ *  IOW, a future version of the library may make the transformations flag
+ *  a bit more fine-grained, with separate bits for each of these three
+ *  functions.
+ *
+ *  More to the point, these functions make it obvious what libpng will be
+ *  doing, whereas "expand" can (and does) mean any number of things.
+ *
+ *  GRP 20060307: In libpng-1.2.9, png_set_gray_1_2_4_to_8() was modified
+ *  to expand only the sample depth but not to expand the tRNS to alpha
+ *  and its name was changed to png_set_expand_gray_1_2_4_to_8().
+ */
+
+/* Expand paletted images to RGB. */
+void PNGAPI
+png_set_palette_to_rgb(png_structp png_ptr)
+{
+   png_debug(1, "in png_set_palette_to_rgb");
+
+   if (png_ptr == NULL)
+      return;
+
+   png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS);
+   png_ptr->flags &= ~PNG_FLAG_ROW_INIT;
+}
+
+#ifndef PNG_1_0_X
+/* Expand grayscale images of less than 8-bit depth to 8 bits. */
+void PNGAPI
+png_set_expand_gray_1_2_4_to_8(png_structp png_ptr)
+{
+   png_debug(1, "in png_set_expand_gray_1_2_4_to_8");
+
+   if (png_ptr == NULL)
+      return;
+
+   png_ptr->transformations |= PNG_EXPAND;
+   png_ptr->flags &= ~PNG_FLAG_ROW_INIT;
+}
+#endif
+
+#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
+/* Expand grayscale images of less than 8-bit depth to 8 bits. */
+/* Deprecated as of libpng-1.2.9 */
+void PNGAPI
+png_set_gray_1_2_4_to_8(png_structp png_ptr)
+{
+   png_debug(1, "in png_set_gray_1_2_4_to_8");
+
+   if (png_ptr == NULL)
+      return;
+
+   png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS);
+}
+#endif
+
+
+/* Expand tRNS chunks to alpha channels. */
+void PNGAPI
+png_set_tRNS_to_alpha(png_structp png_ptr)
+{
+   png_debug(1, "in png_set_tRNS_to_alpha");
+
+   png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS);
+   png_ptr->flags &= ~PNG_FLAG_ROW_INIT;
+}
+#endif /* defined(PNG_READ_EXPAND_SUPPORTED) */
+
+#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
+void PNGAPI
+png_set_gray_to_rgb(png_structp png_ptr)
+{
+   png_debug(1, "in png_set_gray_to_rgb");
+
+   png_ptr->transformations |= PNG_GRAY_TO_RGB;
+   png_ptr->flags &= ~PNG_FLAG_ROW_INIT;
+}
+#endif
+
+#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+/* Convert a RGB image to a grayscale of the same width.  This allows us,
+ * for example, to convert a 24 bpp RGB image into an 8 bpp grayscale image.
+ */
+
+void PNGAPI
+png_set_rgb_to_gray(png_structp png_ptr, int error_action, double red,
+   double green)
+{
+   int red_fixed, green_fixed;
+   if (png_ptr == NULL)
+      return;
+   if (red > 21474.83647 || red < -21474.83648 ||
+       green > 21474.83647 || green < -21474.83648)
+   {
+      png_warning(png_ptr, "ignoring out of range rgb_to_gray coefficients");
+      red_fixed = -1;
+      green_fixed = -1;
+   }
+   else
+   {
+      red_fixed = (int)((float)red*100000.0 + 0.5);
+      green_fixed = (int)((float)green*100000.0 + 0.5);
+   }
+   png_set_rgb_to_gray_fixed(png_ptr, error_action, red_fixed, green_fixed);
+}
+#endif
+
+void PNGAPI
+png_set_rgb_to_gray_fixed(png_structp png_ptr, int error_action,
+   png_fixed_point red, png_fixed_point green)
+{
+   png_debug(1, "in png_set_rgb_to_gray");
+
+   if (png_ptr == NULL)
+      return;
+
+   switch(error_action)
+   {
+      case 1: png_ptr->transformations |= PNG_RGB_TO_GRAY;
+              break;
+
+      case 2: png_ptr->transformations |= PNG_RGB_TO_GRAY_WARN;
+              break;
+
+      case 3: png_ptr->transformations |= PNG_RGB_TO_GRAY_ERR;
+   }
+   if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
+#ifdef PNG_READ_EXPAND_SUPPORTED
+      png_ptr->transformations |= PNG_EXPAND;
+#else
+   {
+      png_warning(png_ptr,
+        "Cannot do RGB_TO_GRAY without EXPAND_SUPPORTED.");
+      png_ptr->transformations &= ~PNG_RGB_TO_GRAY;
+   }
+#endif
+   {
+      png_uint_16 red_int, green_int;
+      if (red < 0 || green < 0)
+      {
+         red_int   =  6968; /* .212671 * 32768 + .5 */
+         green_int = 23434; /* .715160 * 32768 + .5 */
+      }
+      else if (red + green < 100000L)
+      {
+         red_int = (png_uint_16)(((png_uint_32)red*32768L)/100000L);
+         green_int = (png_uint_16)(((png_uint_32)green*32768L)/100000L);
+      }
+      else
+      {
+         png_warning(png_ptr, "ignoring out of range rgb_to_gray coefficients");
+         red_int   =  6968;
+         green_int = 23434;
+      }
+      png_ptr->rgb_to_gray_red_coeff   = red_int;
+      png_ptr->rgb_to_gray_green_coeff = green_int;
+      png_ptr->rgb_to_gray_blue_coeff  =
+         (png_uint_16)(32768 - red_int - green_int);
+   }
+}
+#endif
+
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
+    defined(PNG_LEGACY_SUPPORTED) || \
+    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+void PNGAPI
+png_set_read_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
+   read_user_transform_fn)
+{
+   png_debug(1, "in png_set_read_user_transform_fn");
+
+   if (png_ptr == NULL)
+      return;
+
+#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
+   png_ptr->transformations |= PNG_USER_TRANSFORM;
+   png_ptr->read_user_transform_fn = read_user_transform_fn;
+#endif
+#ifdef PNG_LEGACY_SUPPORTED
+   if (read_user_transform_fn)
+      png_warning(png_ptr,
+        "This version of libpng does not support user transforms");
+#endif
+}
+#endif
+
+/* Initialize everything needed for the read.  This includes modifying
+ * the palette.
+ */
+void /* PRIVATE */
+png_init_read_transformations(png_structp png_ptr)
+{
+   png_debug(1, "in png_init_read_transformations");
+
+#ifdef PNG_USELESS_TESTS_SUPPORTED
+  if (png_ptr != NULL)
+#endif
+  {
+#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
+    defined(PNG_READ_SHIFT_SUPPORTED) || \
+    defined(PNG_READ_GAMMA_SUPPORTED)
+   int color_type = png_ptr->color_type;
+#endif
+
+#if defined(PNG_READ_EXPAND_SUPPORTED) && defined(PNG_READ_BACKGROUND_SUPPORTED)
+
+#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
+   /* Detect gray background and attempt to enable optimization
+    * for gray --> RGB case
+    *
+    * Note:  if PNG_BACKGROUND_EXPAND is set and color_type is either RGB or
+    * RGB_ALPHA (in which case need_expand is superfluous anyway), the
+    * background color might actually be gray yet not be flagged as such.
+    * This is not a problem for the current code, which uses
+    * PNG_BACKGROUND_IS_GRAY only to decide when to do the
+    * png_do_gray_to_rgb() transformation.
+    */
+   if ((png_ptr->transformations & PNG_BACKGROUND_EXPAND) &&
+       !(color_type & PNG_COLOR_MASK_COLOR))
+   {
+          png_ptr->mode |= PNG_BACKGROUND_IS_GRAY;
+   } else if ((png_ptr->transformations & PNG_BACKGROUND) &&
+              !(png_ptr->transformations & PNG_BACKGROUND_EXPAND) &&
+              (png_ptr->transformations & PNG_GRAY_TO_RGB) &&
+              png_ptr->background.red == png_ptr->background.green &&
+              png_ptr->background.red == png_ptr->background.blue)
+   {
+          png_ptr->mode |= PNG_BACKGROUND_IS_GRAY;
+          png_ptr->background.gray = png_ptr->background.red;
+   }
+#endif
+
+   if ((png_ptr->transformations & PNG_BACKGROUND_EXPAND) &&
+       (png_ptr->transformations & PNG_EXPAND))
+   {
+      if (!(color_type & PNG_COLOR_MASK_COLOR))  /* i.e., GRAY or GRAY_ALPHA */
+      {
+         /* Expand background and tRNS chunks */
+         switch (png_ptr->bit_depth)
+         {
+            case 1:
+               png_ptr->background.gray *= (png_uint_16)0xff;
+               png_ptr->background.red = png_ptr->background.green
+                 =  png_ptr->background.blue = png_ptr->background.gray;
+               if (!(png_ptr->transformations & PNG_EXPAND_tRNS))
+               {
+                 png_ptr->trans_values.gray *= (png_uint_16)0xff;
+                 png_ptr->trans_values.red = png_ptr->trans_values.green
+                   = png_ptr->trans_values.blue = png_ptr->trans_values.gray;
+               }
+               break;
+
+            case 2:
+               png_ptr->background.gray *= (png_uint_16)0x55;
+               png_ptr->background.red = png_ptr->background.green
+                 = png_ptr->background.blue = png_ptr->background.gray;
+               if (!(png_ptr->transformations & PNG_EXPAND_tRNS))
+               {
+                 png_ptr->trans_values.gray *= (png_uint_16)0x55;
+                 png_ptr->trans_values.red = png_ptr->trans_values.green
+                   = png_ptr->trans_values.blue = png_ptr->trans_values.gray;
+               }
+               break;
+
+            case 4:
+               png_ptr->background.gray *= (png_uint_16)0x11;
+               png_ptr->background.red = png_ptr->background.green
+                 = png_ptr->background.blue = png_ptr->background.gray;
+               if (!(png_ptr->transformations & PNG_EXPAND_tRNS))
+               {
+                 png_ptr->trans_values.gray *= (png_uint_16)0x11;
+                 png_ptr->trans_values.red = png_ptr->trans_values.green
+                   = png_ptr->trans_values.blue = png_ptr->trans_values.gray;
+               }
+               break;
+
+            case 8:
+
+            case 16:
+               png_ptr->background.red = png_ptr->background.green
+                 = png_ptr->background.blue = png_ptr->background.gray;
+               break;
+         }
+      }
+      else if (color_type == PNG_COLOR_TYPE_PALETTE)
+      {
+         png_ptr->background.red   =
+            png_ptr->palette[png_ptr->background.index].red;
+         png_ptr->background.green =
+            png_ptr->palette[png_ptr->background.index].green;
+         png_ptr->background.blue  =
+            png_ptr->palette[png_ptr->background.index].blue;
+
+#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
+        if (png_ptr->transformations & PNG_INVERT_ALPHA)
+        {
+#ifdef PNG_READ_EXPAND_SUPPORTED
+           if (!(png_ptr->transformations & PNG_EXPAND_tRNS))
+#endif
+           {
+           /* Invert the alpha channel (in tRNS) unless the pixels are
+            * going to be expanded, in which case leave it for later
+            */
+              int i, istop;
+              istop=(int)png_ptr->num_trans;
+              for (i=0; i<istop; i++)
+                 png_ptr->trans[i] = (png_byte)(255 - png_ptr->trans[i]);
+           }
+        }
+#endif
+
+      }
+   }
+#endif
+
+#if defined(PNG_READ_BACKGROUND_SUPPORTED) && defined(PNG_READ_GAMMA_SUPPORTED)
+   png_ptr->background_1 = png_ptr->background;
+#endif
+#if defined(PNG_READ_GAMMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
+
+   if ((color_type == PNG_COLOR_TYPE_PALETTE && png_ptr->num_trans != 0)
+       && (fabs(png_ptr->screen_gamma * png_ptr->gamma - 1.0)
+         < PNG_GAMMA_THRESHOLD))
+   {
+    int i, k;
+    k=0;
+    for (i=0; i<png_ptr->num_trans; i++)
+    {
+      if (png_ptr->trans[i] != 0 && png_ptr->trans[i] != 0xff)
+        k=1; /* Partial transparency is present */
+    }
+    if (k == 0)
+      png_ptr->transformations &= ~PNG_GAMMA;
+   }
+
+   if ((png_ptr->transformations & (PNG_GAMMA | PNG_RGB_TO_GRAY)) &&
+        png_ptr->gamma != 0.0)
+   {
+      png_build_gamma_table(png_ptr);
+
+#ifdef PNG_READ_BACKGROUND_SUPPORTED
+      if (png_ptr->transformations & PNG_BACKGROUND)
+      {
+         if (color_type == PNG_COLOR_TYPE_PALETTE)
+         {
+           /* Could skip if no transparency */
+            png_color back, back_1;
+            png_colorp palette = png_ptr->palette;
+            int num_palette = png_ptr->num_palette;
+            int i;
+            if (png_ptr->background_gamma_type == PNG_BACKGROUND_GAMMA_FILE)
+            {
+               back.red = png_ptr->gamma_table[png_ptr->background.red];
+               back.green = png_ptr->gamma_table[png_ptr->background.green];
+               back.blue = png_ptr->gamma_table[png_ptr->background.blue];
+
+               back_1.red = png_ptr->gamma_to_1[png_ptr->background.red];
+               back_1.green = png_ptr->gamma_to_1[png_ptr->background.green];
+               back_1.blue = png_ptr->gamma_to_1[png_ptr->background.blue];
+            }
+            else
+            {
+               double g, gs;
+
+               switch (png_ptr->background_gamma_type)
+               {
+                  case PNG_BACKGROUND_GAMMA_SCREEN:
+                     g = (png_ptr->screen_gamma);
+                     gs = 1.0;
+                     break;
+
+                  case PNG_BACKGROUND_GAMMA_FILE:
+                     g = 1.0 / (png_ptr->gamma);
+                     gs = 1.0 / (png_ptr->gamma * png_ptr->screen_gamma);
+                     break;
+
+                  case PNG_BACKGROUND_GAMMA_UNIQUE:
+                     g = 1.0 / (png_ptr->background_gamma);
+                     gs = 1.0 / (png_ptr->background_gamma *
+                                 png_ptr->screen_gamma);
+                     break;
+                  default:
+                     g = 1.0;    /* back_1 */
+                     gs = 1.0;   /* back */
+               }
+
+               if ( fabs(gs - 1.0) < PNG_GAMMA_THRESHOLD)
+               {
+                  back.red   = (png_byte)png_ptr->background.red;
+                  back.green = (png_byte)png_ptr->background.green;
+                  back.blue  = (png_byte)png_ptr->background.blue;
+               }
+               else
+               {
+                  back.red = (png_byte)(pow(
+                     (double)png_ptr->background.red/255, gs) * 255.0 + .5);
+                  back.green = (png_byte)(pow(
+                     (double)png_ptr->background.green/255, gs) * 255.0
+                         + .5);
+                  back.blue = (png_byte)(pow(
+                     (double)png_ptr->background.blue/255, gs) * 255.0 + .5);
+               }
+
+               back_1.red = (png_byte)(pow(
+                  (double)png_ptr->background.red/255, g) * 255.0 + .5);
+               back_1.green = (png_byte)(pow(
+                  (double)png_ptr->background.green/255, g) * 255.0 + .5);
+               back_1.blue = (png_byte)(pow(
+                  (double)png_ptr->background.blue/255, g) * 255.0 + .5);
+            }
+            for (i = 0; i < num_palette; i++)
+            {
+               if (i < (int)png_ptr->num_trans && png_ptr->trans[i] != 0xff)
+               {
+                  if (png_ptr->trans[i] == 0)
+                  {
+                     palette[i] = back;
+                  }
+                  else /* if (png_ptr->trans[i] != 0xff) */
+                  {
+                     png_byte v, w;
+
+                     v = png_ptr->gamma_to_1[palette[i].red];
+                     png_composite(w, v, png_ptr->trans[i], back_1.red);
+                     palette[i].red = png_ptr->gamma_from_1[w];
+
+                     v = png_ptr->gamma_to_1[palette[i].green];
+                     png_composite(w, v, png_ptr->trans[i], back_1.green);
+                     palette[i].green = png_ptr->gamma_from_1[w];
+
+                     v = png_ptr->gamma_to_1[palette[i].blue];
+                     png_composite(w, v, png_ptr->trans[i], back_1.blue);
+                     palette[i].blue = png_ptr->gamma_from_1[w];
+                  }
+               }
+               else
+               {
+                  palette[i].red = png_ptr->gamma_table[palette[i].red];
+                  palette[i].green = png_ptr->gamma_table[palette[i].green];
+                  palette[i].blue = png_ptr->gamma_table[palette[i].blue];
+               }
+            }
+            /* Prevent the transformations being done again, and make sure
+             * that the now spurious alpha channel is stripped - the code
+             * has just reduced background composition and gamma correction
+             * to a simple alpha channel strip.
+             */
+            png_ptr->transformations &= ~PNG_BACKGROUND;
+            png_ptr->transformations &= ~PNG_GAMMA;
+            png_ptr->transformations |= PNG_STRIP_ALPHA;
+         }
+         /* if (png_ptr->background_gamma_type!=PNG_BACKGROUND_GAMMA_UNKNOWN) */
+         else
+         /* color_type != PNG_COLOR_TYPE_PALETTE */
+         {
+            double m = (double)(((png_uint_32)1 << png_ptr->bit_depth) - 1);
+            double g = 1.0;
+            double gs = 1.0;
+
+            switch (png_ptr->background_gamma_type)
+            {
+               case PNG_BACKGROUND_GAMMA_SCREEN:
+                  g = (png_ptr->screen_gamma);
+                  gs = 1.0;
+                  break;
+
+               case PNG_BACKGROUND_GAMMA_FILE:
+                  g = 1.0 / (png_ptr->gamma);
+                  gs = 1.0 / (png_ptr->gamma * png_ptr->screen_gamma);
+                  break;
+
+               case PNG_BACKGROUND_GAMMA_UNIQUE:
+                  g = 1.0 / (png_ptr->background_gamma);
+                  gs = 1.0 / (png_ptr->background_gamma *
+                     png_ptr->screen_gamma);
+                  break;
+            }
+
+            png_ptr->background_1.gray = (png_uint_16)(pow(
+               (double)png_ptr->background.gray / m, g) * m + .5);
+            png_ptr->background.gray = (png_uint_16)(pow(
+               (double)png_ptr->background.gray / m, gs) * m + .5);
+
+            if ((png_ptr->background.red != png_ptr->background.green) ||
+                (png_ptr->background.red != png_ptr->background.blue) ||
+                (png_ptr->background.red != png_ptr->background.gray))
+            {
+               /* RGB or RGBA with color background */
+               png_ptr->background_1.red = (png_uint_16)(pow(
+                  (double)png_ptr->background.red / m, g) * m + .5);
+               png_ptr->background_1.green = (png_uint_16)(pow(
+                  (double)png_ptr->background.green / m, g) * m + .5);
+               png_ptr->background_1.blue = (png_uint_16)(pow(
+                  (double)png_ptr->background.blue / m, g) * m + .5);
+               png_ptr->background.red = (png_uint_16)(pow(
+                  (double)png_ptr->background.red / m, gs) * m + .5);
+               png_ptr->background.green = (png_uint_16)(pow(
+                  (double)png_ptr->background.green / m, gs) * m + .5);
+               png_ptr->background.blue = (png_uint_16)(pow(
+                  (double)png_ptr->background.blue / m, gs) * m + .5);
+            }
+            else
+            {
+               /* GRAY, GRAY ALPHA, RGB, or RGBA with gray background */
+               png_ptr->background_1.red = png_ptr->background_1.green
+                 = png_ptr->background_1.blue = png_ptr->background_1.gray;
+               png_ptr->background.red = png_ptr->background.green
+                 = png_ptr->background.blue = png_ptr->background.gray;
+            }
+         }
+      }
+      else
+      /* Transformation does not include PNG_BACKGROUND */
+#endif /* PNG_READ_BACKGROUND_SUPPORTED */
+      if (color_type == PNG_COLOR_TYPE_PALETTE)
+      {
+         png_colorp palette = png_ptr->palette;
+         int num_palette = png_ptr->num_palette;
+         int i;
+
+         for (i = 0; i < num_palette; i++)
+         {
+            palette[i].red = png_ptr->gamma_table[palette[i].red];
+            palette[i].green = png_ptr->gamma_table[palette[i].green];
+            palette[i].blue = png_ptr->gamma_table[palette[i].blue];
+         }
+
+         /* Done the gamma correction. */
+         png_ptr->transformations &= ~PNG_GAMMA;
+      }
+   }
+#ifdef PNG_READ_BACKGROUND_SUPPORTED
+   else
+#endif
+#endif /* PNG_READ_GAMMA_SUPPORTED && PNG_FLOATING_POINT_SUPPORTED */
+#ifdef PNG_READ_BACKGROUND_SUPPORTED
+   /* No GAMMA transformation */
+   if ((png_ptr->transformations & PNG_BACKGROUND) &&
+       (color_type == PNG_COLOR_TYPE_PALETTE))
+   {
+      int i;
+      int istop = (int)png_ptr->num_trans;
+      png_color back;
+      png_colorp palette = png_ptr->palette;
+
+      back.red   = (png_byte)png_ptr->background.red;
+      back.green = (png_byte)png_ptr->background.green;
+      back.blue  = (png_byte)png_ptr->background.blue;
+
+      for (i = 0; i < istop; i++)
+      {
+         if (png_ptr->trans[i] == 0)
+         {
+            palette[i] = back;
+         }
+         else if (png_ptr->trans[i] != 0xff)
+         {
+            /* The png_composite() macro is defined in png.h */
+            png_composite(palette[i].red, palette[i].red,
+               png_ptr->trans[i], back.red);
+            png_composite(palette[i].green, palette[i].green,
+               png_ptr->trans[i], back.green);
+            png_composite(palette[i].blue, palette[i].blue,
+               png_ptr->trans[i], back.blue);
+         }
+      }
+
+      /* Handled alpha, still need to strip the channel. */
+      png_ptr->transformations &= ~PNG_BACKGROUND;
+      png_ptr->transformations |= PNG_STRIP_ALPHA;
+   }
+#endif /* PNG_READ_BACKGROUND_SUPPORTED */
+
+#ifdef PNG_READ_SHIFT_SUPPORTED
+   if ((png_ptr->transformations & PNG_SHIFT) &&
+      (color_type == PNG_COLOR_TYPE_PALETTE))
+   {
+      png_uint_16 i;
+      png_uint_16 istop = png_ptr->num_palette;
+      int sr = 8 - png_ptr->sig_bit.red;
+      int sg = 8 - png_ptr->sig_bit.green;
+      int sb = 8 - png_ptr->sig_bit.blue;
+
+      if (sr < 0 || sr > 8)
+         sr = 0;
+      if (sg < 0 || sg > 8)
+         sg = 0;
+      if (sb < 0 || sb > 8)
+         sb = 0;
+      for (i = 0; i < istop; i++)
+      {
+         png_ptr->palette[i].red >>= sr;
+         png_ptr->palette[i].green >>= sg;
+         png_ptr->palette[i].blue >>= sb;
+      }
+   }
+#endif  /* PNG_READ_SHIFT_SUPPORTED */
+ }
+#if !defined(PNG_READ_GAMMA_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED) \
+ && !defined(PNG_READ_BACKGROUND_SUPPORTED)
+   if (png_ptr)
+      return;
+#endif
+}
+
+/* Modify the info structure to reflect the transformations.  The
+ * info should be updated so a PNG file could be written with it,
+ * assuming the transformations result in valid PNG data.
+ */
+void /* PRIVATE */
+png_read_transform_info(png_structp png_ptr, png_infop info_ptr)
+{
+   png_debug(1, "in png_read_transform_info");
+
+#ifdef PNG_READ_EXPAND_SUPPORTED
+   if (png_ptr->transformations & PNG_EXPAND)
+   {
+      if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
+      {
+         if (png_ptr->num_trans)
+            info_ptr->color_type = PNG_COLOR_TYPE_RGB_ALPHA;
+         else
+            info_ptr->color_type = PNG_COLOR_TYPE_RGB;
+         info_ptr->bit_depth = 8;
+         info_ptr->num_trans = 0;
+      }
+      else
+      {
+         if (png_ptr->num_trans)
+         {
+            if (png_ptr->transformations & PNG_EXPAND_tRNS)
+              info_ptr->color_type |= PNG_COLOR_MASK_ALPHA;
+         }
+         if (info_ptr->bit_depth < 8)
+            info_ptr->bit_depth = 8;
+         info_ptr->num_trans = 0;
+      }
+   }
+#endif
+
+#ifdef PNG_READ_BACKGROUND_SUPPORTED
+   if (png_ptr->transformations & PNG_BACKGROUND)
+   {
+      info_ptr->color_type &= ~PNG_COLOR_MASK_ALPHA;
+      info_ptr->num_trans = 0;
+      info_ptr->background = png_ptr->background;
+   }
+#endif
+
+#ifdef PNG_READ_GAMMA_SUPPORTED
+   if (png_ptr->transformations & PNG_GAMMA)
+   {
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+      info_ptr->gamma = png_ptr->gamma;
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+      info_ptr->int_gamma = png_ptr->int_gamma;
+#endif
+   }
+#endif
+
+#ifdef PNG_READ_16_TO_8_SUPPORTED
+   if ((png_ptr->transformations & PNG_16_TO_8) && (info_ptr->bit_depth == 16))
+      info_ptr->bit_depth = 8;
+#endif
+
+#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
+   if (png_ptr->transformations & PNG_GRAY_TO_RGB)
+      info_ptr->color_type |= PNG_COLOR_MASK_COLOR;
+#endif
+
+#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
+   if (png_ptr->transformations & PNG_RGB_TO_GRAY)
+      info_ptr->color_type &= ~PNG_COLOR_MASK_COLOR;
+#endif
+
+#ifdef PNG_READ_DITHER_SUPPORTED
+   if (png_ptr->transformations & PNG_DITHER)
+   {
+      if (((info_ptr->color_type == PNG_COLOR_TYPE_RGB) ||
+          (info_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA)) &&
+          png_ptr->palette_lookup && info_ptr->bit_depth == 8)
+      {
+         info_ptr->color_type = PNG_COLOR_TYPE_PALETTE;
+      }
+   }
+#endif
+
+#ifdef PNG_READ_PACK_SUPPORTED
+   if ((png_ptr->transformations & PNG_PACK) && (info_ptr->bit_depth < 8))
+      info_ptr->bit_depth = 8;
+#endif
+
+   if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
+      info_ptr->channels = 1;
+   else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR)
+      info_ptr->channels = 3;
+   else
+      info_ptr->channels = 1;
+
+#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
+   if (png_ptr->flags & PNG_FLAG_STRIP_ALPHA)
+      info_ptr->color_type &= ~PNG_COLOR_MASK_ALPHA;
+#endif
+
+   if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA)
+      info_ptr->channels++;
+
+#ifdef PNG_READ_FILLER_SUPPORTED
+   /* STRIP_ALPHA and FILLER allowed:  MASK_ALPHA bit stripped above */
+   if ((png_ptr->transformations & PNG_FILLER) &&
+       ((info_ptr->color_type == PNG_COLOR_TYPE_RGB) ||
+       (info_ptr->color_type == PNG_COLOR_TYPE_GRAY)))
+   {
+      info_ptr->channels++;
+      /* If adding a true alpha channel not just filler */
+#ifndef PNG_1_0_X
+      if (png_ptr->transformations & PNG_ADD_ALPHA)
+        info_ptr->color_type |= PNG_COLOR_MASK_ALPHA;
+#endif
+   }
+#endif
+
+#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) && \
+defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
+   if (png_ptr->transformations & PNG_USER_TRANSFORM)
+     {
+       if (info_ptr->bit_depth < png_ptr->user_transform_depth)
+         info_ptr->bit_depth = png_ptr->user_transform_depth;
+       if (info_ptr->channels < png_ptr->user_transform_channels)
+         info_ptr->channels = png_ptr->user_transform_channels;
+     }
+#endif
+
+   info_ptr->pixel_depth = (png_byte)(info_ptr->channels *
+      info_ptr->bit_depth);
+
+   info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, info_ptr->width);
+
+#ifndef PNG_READ_EXPAND_SUPPORTED
+   if (png_ptr)
+      return;
+#endif
+}
+
+/* Transform the row.  The order of transformations is significant,
+ * and is very touchy.  If you add a transformation, take care to
+ * decide how it fits in with the other transformations here.
+ */
+void /* PRIVATE */
+png_do_read_transformations(png_structp png_ptr)
+{
+   png_debug(1, "in png_do_read_transformations");
+
+   if (png_ptr->row_buf == NULL)
+   {
+#if defined(PNG_STDIO_SUPPORTED) && !defined(_WIN32_WCE)
+      char msg[50];
+
+      png_snprintf2(msg, 50,
+         "NULL row buffer for row %ld, pass %d", (long)png_ptr->row_number,
+         png_ptr->pass);
+      png_error(png_ptr, msg);
+#else
+      png_error(png_ptr, "NULL row buffer");
+#endif
+   }
+#ifdef PNG_WARN_UNINITIALIZED_ROW
+   if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
+      /* Application has failed to call either png_read_start_image()
+       * or png_read_update_info() after setting transforms that expand
+       * pixels.  This check added to libpng-1.2.19
+       */
+#if (PNG_WARN_UNINITIALIZED_ROW==1)
+      png_error(png_ptr, "Uninitialized row");
+#else
+      png_warning(png_ptr, "Uninitialized row");
+#endif
+#endif
+
+#ifdef PNG_READ_EXPAND_SUPPORTED
+   if (png_ptr->transformations & PNG_EXPAND)
+   {
+      if (png_ptr->row_info.color_type == PNG_COLOR_TYPE_PALETTE)
+      {
+         png_do_expand_palette(&(png_ptr->row_info), png_ptr->row_buf + 1,
+            png_ptr->palette, png_ptr->trans, png_ptr->num_trans);
+      }
+      else
+      {
+         if (png_ptr->num_trans &&
+             (png_ptr->transformations & PNG_EXPAND_tRNS))
+            png_do_expand(&(png_ptr->row_info), png_ptr->row_buf + 1,
+               &(png_ptr->trans_values));
+         else
+            png_do_expand(&(png_ptr->row_info), png_ptr->row_buf + 1,
+               NULL);
+      }
+   }
+#endif
+
+#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
+   if (png_ptr->flags & PNG_FLAG_STRIP_ALPHA)
+      png_do_strip_filler(&(png_ptr->row_info), png_ptr->row_buf + 1,
+         PNG_FLAG_FILLER_AFTER | (png_ptr->flags & PNG_FLAG_STRIP_ALPHA));
+#endif
+
+#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
+   if (png_ptr->transformations & PNG_RGB_TO_GRAY)
+   {
+      int rgb_error =
+         png_do_rgb_to_gray(png_ptr, &(png_ptr->row_info),
+             png_ptr->row_buf + 1);
+      if (rgb_error)
+      {
+         png_ptr->rgb_to_gray_status=1;
+         if ((png_ptr->transformations & PNG_RGB_TO_GRAY) ==
+             PNG_RGB_TO_GRAY_WARN)
+            png_warning(png_ptr, "png_do_rgb_to_gray found nongray pixel");
+         if ((png_ptr->transformations & PNG_RGB_TO_GRAY) ==
+             PNG_RGB_TO_GRAY_ERR)
+            png_error(png_ptr, "png_do_rgb_to_gray found nongray pixel");
+      }
+   }
+#endif
+
+/* From Andreas Dilger e-mail to png-implement, 26 March 1998:
+ *
+ *   In most cases, the "simple transparency" should be done prior to doing
+ *   gray-to-RGB, or you will have to test 3x as many bytes to check if a
+ *   pixel is transparent.  You would also need to make sure that the
+ *   transparency information is upgraded to RGB.
+ *
+ *   To summarize, the current flow is:
+ *   - Gray + simple transparency -> compare 1 or 2 gray bytes and composite
+ *                                   with background "in place" if transparent,
+ *                                   convert to RGB if necessary
+ *   - Gray + alpha -> composite with gray background and remove alpha bytes,
+ *                                   convert to RGB if necessary
+ *
+ *   To support RGB backgrounds for gray images we need:
+ *   - Gray + simple transparency -> convert to RGB + simple transparency,
+ *                                   compare 3 or 6 bytes and composite with
+ *                                   background "in place" if transparent
+ *                                   (3x compare/pixel compared to doing
+ *                                   composite with gray bkgrnd)
+ *   - Gray + alpha -> convert to RGB + alpha, composite with background and
+ *                                   remove alpha bytes (3x float
+ *                                   operations/pixel compared with composite
+ *                                   on gray background)
+ *
+ *  Greg's change will do this.  The reason it wasn't done before is for
+ *  performance, as this increases the per-pixel operations.  If we would check
+ *  in advance if the background was gray or RGB, and position the gray-to-RGB
+ *  transform appropriately, then it would save a lot of work/time.
+ */
+
+#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
+   /* If gray -> RGB, do so now only if background is non-gray; else do later
+    * for performance reasons
+    */
+   if ((png_ptr->transformations & PNG_GRAY_TO_RGB) &&
+       !(png_ptr->mode & PNG_BACKGROUND_IS_GRAY))
+      png_do_gray_to_rgb(&(png_ptr->row_info), png_ptr->row_buf + 1);
+#endif
+
+#ifdef PNG_READ_BACKGROUND_SUPPORTED
+   if ((png_ptr->transformations & PNG_BACKGROUND) &&
+      ((png_ptr->num_trans != 0 ) ||
+      (png_ptr->color_type & PNG_COLOR_MASK_ALPHA)))
+      png_do_background(&(png_ptr->row_info), png_ptr->row_buf + 1,
+         &(png_ptr->trans_values), &(png_ptr->background)
+#ifdef PNG_READ_GAMMA_SUPPORTED
+         , &(png_ptr->background_1),
+         png_ptr->gamma_table, png_ptr->gamma_from_1,
+         png_ptr->gamma_to_1, png_ptr->gamma_16_table,
+         png_ptr->gamma_16_from_1, png_ptr->gamma_16_to_1,
+         png_ptr->gamma_shift
+#endif
+);
+#endif
+
+#ifdef PNG_READ_GAMMA_SUPPORTED
+   if ((png_ptr->transformations & PNG_GAMMA) &&
+#ifdef PNG_READ_BACKGROUND_SUPPORTED
+       !((png_ptr->transformations & PNG_BACKGROUND) &&
+       ((png_ptr->num_trans != 0) ||
+       (png_ptr->color_type & PNG_COLOR_MASK_ALPHA))) &&
+#endif
+       (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE))
+      png_do_gamma(&(png_ptr->row_info), png_ptr->row_buf + 1,
+          png_ptr->gamma_table, png_ptr->gamma_16_table,
+          png_ptr->gamma_shift);
+#endif
+
+#ifdef PNG_READ_16_TO_8_SUPPORTED
+   if (png_ptr->transformations & PNG_16_TO_8)
+      png_do_chop(&(png_ptr->row_info), png_ptr->row_buf + 1);
+#endif
+
+#ifdef PNG_READ_DITHER_SUPPORTED
+   if (png_ptr->transformations & PNG_DITHER)
+   {
+      png_do_dither((png_row_infop)&(png_ptr->row_info), png_ptr->row_buf + 1,
+         png_ptr->palette_lookup, png_ptr->dither_index);
+      if (png_ptr->row_info.rowbytes == (png_uint_32)0)
+         png_error(png_ptr, "png_do_dither returned rowbytes=0");
+   }
+#endif
+
+#ifdef PNG_READ_INVERT_SUPPORTED
+   if (png_ptr->transformations & PNG_INVERT_MONO)
+      png_do_invert(&(png_ptr->row_info), png_ptr->row_buf + 1);
+#endif
+
+#ifdef PNG_READ_SHIFT_SUPPORTED
+   if (png_ptr->transformations & PNG_SHIFT)
+      png_do_unshift(&(png_ptr->row_info), png_ptr->row_buf + 1,
+         &(png_ptr->shift));
+#endif
+
+#ifdef PNG_READ_PACK_SUPPORTED
+   if (png_ptr->transformations & PNG_PACK)
+      png_do_unpack(&(png_ptr->row_info), png_ptr->row_buf + 1);
+#endif
+
+#ifdef PNG_READ_BGR_SUPPORTED
+   if (png_ptr->transformations & PNG_BGR)
+      png_do_bgr(&(png_ptr->row_info), png_ptr->row_buf + 1);
+#endif
+
+#ifdef PNG_READ_PACKSWAP_SUPPORTED
+   if (png_ptr->transformations & PNG_PACKSWAP)
+      png_do_packswap(&(png_ptr->row_info), png_ptr->row_buf + 1);
+#endif
+
+#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
+   /* If gray -> RGB, do so now only if we did not do so above */
+   if ((png_ptr->transformations & PNG_GRAY_TO_RGB) &&
+       (png_ptr->mode & PNG_BACKGROUND_IS_GRAY))
+      png_do_gray_to_rgb(&(png_ptr->row_info), png_ptr->row_buf + 1);
+#endif
+
+#ifdef PNG_READ_FILLER_SUPPORTED
+   if (png_ptr->transformations & PNG_FILLER)
+      png_do_read_filler(&(png_ptr->row_info), png_ptr->row_buf + 1,
+         (png_uint_32)png_ptr->filler, png_ptr->flags);
+#endif
+
+#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
+   if (png_ptr->transformations & PNG_INVERT_ALPHA)
+      png_do_read_invert_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1);
+#endif
+
+#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED
+   if (png_ptr->transformations & PNG_SWAP_ALPHA)
+      png_do_read_swap_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1);
+#endif
+
+#ifdef PNG_READ_SWAP_SUPPORTED
+   if (png_ptr->transformations & PNG_SWAP_BYTES)
+      png_do_swap(&(png_ptr->row_info), png_ptr->row_buf + 1);
+#endif
+
+#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
+   if (png_ptr->transformations & PNG_USER_TRANSFORM)
+    {
+      if (png_ptr->read_user_transform_fn != NULL)
+         (*(png_ptr->read_user_transform_fn)) /* User read transform function */
+            (png_ptr,                    /* png_ptr */
+               &(png_ptr->row_info),     /* row_info: */
+               /*  png_uint_32 width;       width of row */
+               /*  png_uint_32 rowbytes;    number of bytes in row */
+               /*  png_byte color_type;     color type of pixels */
+               /*  png_byte bit_depth;      bit depth of samples */
+               /*  png_byte channels;       number of channels (1-4) */
+               /*  png_byte pixel_depth;    bits per pixel (depth*channels) */
+               png_ptr->row_buf + 1);    /* start of pixel data for row */
+#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
+      if (png_ptr->user_transform_depth)
+         png_ptr->row_info.bit_depth = png_ptr->user_transform_depth;
+      if (png_ptr->user_transform_channels)
+         png_ptr->row_info.channels = png_ptr->user_transform_channels;
+#endif
+      png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth *
+         png_ptr->row_info.channels);
+      png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
+         png_ptr->row_info.width);
+   }
+#endif
+
+}
+
+#ifdef PNG_READ_PACK_SUPPORTED
+/* Unpack pixels of 1, 2, or 4 bits per pixel into 1 byte per pixel,
+ * without changing the actual values.  Thus, if you had a row with
+ * a bit depth of 1, you would end up with bytes that only contained
+ * the numbers 0 or 1.  If you would rather they contain 0 and 255, use
+ * png_do_shift() after this.
+ */
+void /* PRIVATE */
+png_do_unpack(png_row_infop row_info, png_bytep row)
+{
+   png_debug(1, "in png_do_unpack");
+
+#ifdef PNG_USELESS_TESTS_SUPPORTED
+   if (row != NULL && row_info != NULL && row_info->bit_depth < 8)
+#else
+   if (row_info->bit_depth < 8)
+#endif
+   {
+      png_uint_32 i;
+      png_uint_32 row_width=row_info->width;
+
+      switch (row_info->bit_depth)
+      {
+         case 1:
+         {
+            png_bytep sp = row + (png_size_t)((row_width - 1) >> 3);
+            png_bytep dp = row + (png_size_t)row_width - 1;
+            png_uint_32 shift = 7 - (int)((row_width + 7) & 0x07);
+            for (i = 0; i < row_width; i++)
+            {
+               *dp = (png_byte)((*sp >> shift) & 0x01);
+               if (shift == 7)
+               {
+                  shift = 0;
+                  sp--;
+               }
+               else
+                  shift++;
+
+               dp--;
+            }
+            break;
+         }
+
+         case 2:
+         {
+
+            png_bytep sp = row + (png_size_t)((row_width - 1) >> 2);
+            png_bytep dp = row + (png_size_t)row_width - 1;
+            png_uint_32 shift = (int)((3 - ((row_width + 3) & 0x03)) << 1);
+            for (i = 0; i < row_width; i++)
+            {
+               *dp = (png_byte)((*sp >> shift) & 0x03);
+               if (shift == 6)
+               {
+                  shift = 0;
+                  sp--;
+               }
+               else
+                  shift += 2;
+
+               dp--;
+            }
+            break;
+         }
+
+         case 4:
+         {
+            png_bytep sp = row + (png_size_t)((row_width - 1) >> 1);
+            png_bytep dp = row + (png_size_t)row_width - 1;
+            png_uint_32 shift = (int)((1 - ((row_width + 1) & 0x01)) << 2);
+            for (i = 0; i < row_width; i++)
+            {
+               *dp = (png_byte)((*sp >> shift) & 0x0f);
+               if (shift == 4)
+               {
+                  shift = 0;
+                  sp--;
+               }
+               else
+                  shift = 4;
+
+               dp--;
+            }
+            break;
+         }
+      }
+      row_info->bit_depth = 8;
+      row_info->pixel_depth = (png_byte)(8 * row_info->channels);
+      row_info->rowbytes = row_width * row_info->channels;
+   }
+}
+#endif
+
+#ifdef PNG_READ_SHIFT_SUPPORTED
+/* Reverse the effects of png_do_shift.  This routine merely shifts the
+ * pixels back to their significant bits values.  Thus, if you have
+ * a row of bit depth 8, but only 5 are significant, this will shift
+ * the values back to 0 through 31.
+ */
+void /* PRIVATE */
+png_do_unshift(png_row_infop row_info, png_bytep row, png_color_8p sig_bits)
+{
+   png_debug(1, "in png_do_unshift");
+
+   if (
+#ifdef PNG_USELESS_TESTS_SUPPORTED
+       row != NULL && row_info != NULL && sig_bits != NULL &&
+#endif
+       row_info->color_type != PNG_COLOR_TYPE_PALETTE)
+   {
+      int shift[4];
+      int channels = 0;
+      int c;
+      png_uint_16 value = 0;
+      png_uint_32 row_width = row_info->width;
+
+      if (row_info->color_type & PNG_COLOR_MASK_COLOR)
+      {
+         shift[channels++] = row_info->bit_depth - sig_bits->red;
+         shift[channels++] = row_info->bit_depth - sig_bits->green;
+         shift[channels++] = row_info->bit_depth - sig_bits->blue;
+      }
+      else
+      {
+         shift[channels++] = row_info->bit_depth - sig_bits->gray;
+      }
+      if (row_info->color_type & PNG_COLOR_MASK_ALPHA)
+      {
+         shift[channels++] = row_info->bit_depth - sig_bits->alpha;
+      }
+
+      for (c = 0; c < channels; c++)
+      {
+         if (shift[c] <= 0)
+            shift[c] = 0;
+         else
+            value = 1;
+      }
+
+      if (!value)
+         return;
+
+      switch (row_info->bit_depth)
+      {
+         case 2:
+         {
+            png_bytep bp;
+            png_uint_32 i;
+            png_uint_32 istop = row_info->rowbytes;
+
+            for (bp = row, i = 0; i < istop; i++)
+            {
+               *bp >>= 1;
+               *bp++ &= 0x55;
+            }
+            break;
+         }
+
+         case 4:
+         {
+            png_bytep bp = row;
+            png_uint_32 i;
+            png_uint_32 istop = row_info->rowbytes;
+            png_byte mask = (png_byte)((((int)0xf0 >> shift[0]) & (int)0xf0) |
+               (png_byte)((int)0xf >> shift[0]));
+
+            for (i = 0; i < istop; i++)
+            {
+               *bp >>= shift[0];
+               *bp++ &= mask;
+            }
+            break;
+         }
+
+         case 8:
+         {
+            png_bytep bp = row;
+            png_uint_32 i;
+            png_uint_32 istop = row_width * channels;
+
+            for (i = 0; i < istop; i++)
+            {
+               *bp++ >>= shift[i%channels];
+            }
+            break;
+         }
+
+         case 16:
+         {
+            png_bytep bp = row;
+            png_uint_32 i;
+            png_uint_32 istop = channels * row_width;
+
+            for (i = 0; i < istop; i++)
+            {
+               value = (png_uint_16)((*bp << 8) + *(bp + 1));
+               value >>= shift[i%channels];
+               *bp++ = (png_byte)(value >> 8);
+               *bp++ = (png_byte)(value & 0xff);
+            }
+            break;
+         }
+      }
+   }
+}
+#endif
+
+#ifdef PNG_READ_16_TO_8_SUPPORTED
+/* Chop rows of bit depth 16 down to 8 */
+void /* PRIVATE */
+png_do_chop(png_row_infop row_info, png_bytep row)
+{
+   png_debug(1, "in png_do_chop");
+
+#ifdef PNG_USELESS_TESTS_SUPPORTED
+   if (row != NULL && row_info != NULL && row_info->bit_depth == 16)
+#else
+   if (row_info->bit_depth == 16)
+#endif
+   {
+      png_bytep sp = row;
+      png_bytep dp = row;
+      png_uint_32 i;
+      png_uint_32 istop = row_info->width * row_info->channels;
+
+      for (i = 0; i<istop; i++, sp += 2, dp++)
+      {
+#ifdef PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
+      /* This does a more accurate scaling of the 16-bit color
+       * value, rather than a simple low-byte truncation.
+       *
+       * What the ideal calculation should be:
+       *   *dp = (((((png_uint_32)(*sp) << 8) |
+       *          (png_uint_32)(*(sp + 1))) * 255 + 127)
+       *          / (png_uint_32)65535L;
+       *
+       * GRR: no, I think this is what it really should be:
+       *   *dp = (((((png_uint_32)(*sp) << 8) |
+       *           (png_uint_32)(*(sp + 1))) + 128L)
+       *           / (png_uint_32)257L;
+       *
+       * GRR: here's the exact calculation with shifts:
+       *   temp = (((png_uint_32)(*sp) << 8) |
+       *           (png_uint_32)(*(sp + 1))) + 128L;
+       *   *dp = (temp - (temp >> 8)) >> 8;
+       *
+       * Approximate calculation with shift/add instead of multiply/divide:
+       *   *dp = ((((png_uint_32)(*sp) << 8) |
+       *          (png_uint_32)((int)(*(sp + 1)) - *sp)) + 128) >> 8;
+       *
+       * What we actually do to avoid extra shifting and conversion:
+       */
+
+         *dp = *sp + ((((int)(*(sp + 1)) - *sp) > 128) ? 1 : 0);
+#else
+       /* Simply discard the low order byte */
+         *dp = *sp;
+#endif
+      }
+      row_info->bit_depth = 8;
+      row_info->pixel_depth = (png_byte)(8 * row_info->channels);
+      row_info->rowbytes = row_info->width * row_info->channels;
+   }
+}
+#endif
+
+#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED
+void /* PRIVATE */
+png_do_read_swap_alpha(png_row_infop row_info, png_bytep row)
+{
+   png_debug(1, "in png_do_read_swap_alpha");
+
+#ifdef PNG_USELESS_TESTS_SUPPORTED
+   if (row != NULL && row_info != NULL)
+#endif
+   {
+      png_uint_32 row_width = row_info->width;
+      if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+      {
+         /* This converts from RGBA to ARGB */
+         if (row_info->bit_depth == 8)
+         {
+            png_bytep sp = row + row_info->rowbytes;
+            png_bytep dp = sp;
+            png_byte save;
+            png_uint_32 i;
+
+            for (i = 0; i < row_width; i++)
+            {
+               save = *(--sp);
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+               *(--dp) = save;
+            }
+         }
+         /* This converts from RRGGBBAA to AARRGGBB */
+         else
+         {
+            png_bytep sp = row + row_info->rowbytes;
+            png_bytep dp = sp;
+            png_byte save[2];
+            png_uint_32 i;
+
+            for (i = 0; i < row_width; i++)
+            {
+               save[0] = *(--sp);
+               save[1] = *(--sp);
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+               *(--dp) = save[0];
+               *(--dp) = save[1];
+            }
+         }
+      }
+      else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
+      {
+         /* This converts from GA to AG */
+         if (row_info->bit_depth == 8)
+         {
+            png_bytep sp = row + row_info->rowbytes;
+            png_bytep dp = sp;
+            png_byte save;
+            png_uint_32 i;
+
+            for (i = 0; i < row_width; i++)
+            {
+               save = *(--sp);
+               *(--dp) = *(--sp);
+               *(--dp) = save;
+            }
+         }
+         /* This converts from GGAA to AAGG */
+         else
+         {
+            png_bytep sp = row + row_info->rowbytes;
+            png_bytep dp = sp;
+            png_byte save[2];
+            png_uint_32 i;
+
+            for (i = 0; i < row_width; i++)
+            {
+               save[0] = *(--sp);
+               save[1] = *(--sp);
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+               *(--dp) = save[0];
+               *(--dp) = save[1];
+            }
+         }
+      }
+   }
+}
+#endif
+
+#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
+void /* PRIVATE */
+png_do_read_invert_alpha(png_row_infop row_info, png_bytep row)
+{
+   png_debug(1, "in png_do_read_invert_alpha");
+
+#ifdef PNG_USELESS_TESTS_SUPPORTED
+   if (row != NULL && row_info != NULL)
+#endif
+   {
+      png_uint_32 row_width = row_info->width;
+      if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+      {
+         /* This inverts the alpha channel in RGBA */
+         if (row_info->bit_depth == 8)
+         {
+            png_bytep sp = row + row_info->rowbytes;
+            png_bytep dp = sp;
+            png_uint_32 i;
+
+            for (i = 0; i < row_width; i++)
+            {
+               *(--dp) = (png_byte)(255 - *(--sp));
+
+/*             This does nothing:
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+               We can replace it with:
+*/
+               sp-=3;
+               dp=sp;
+            }
+         }
+         /* This inverts the alpha channel in RRGGBBAA */
+         else
+         {
+            png_bytep sp = row + row_info->rowbytes;
+            png_bytep dp = sp;
+            png_uint_32 i;
+
+            for (i = 0; i < row_width; i++)
+            {
+               *(--dp) = (png_byte)(255 - *(--sp));
+               *(--dp) = (png_byte)(255 - *(--sp));
+
+/*             This does nothing:
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+               We can replace it with:
+*/
+               sp-=6;
+               dp=sp;
+            }
+         }
+      }
+      else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
+      {
+         /* This inverts the alpha channel in GA */
+         if (row_info->bit_depth == 8)
+         {
+            png_bytep sp = row + row_info->rowbytes;
+            png_bytep dp = sp;
+            png_uint_32 i;
+
+            for (i = 0; i < row_width; i++)
+            {
+               *(--dp) = (png_byte)(255 - *(--sp));
+               *(--dp) = *(--sp);
+            }
+         }
+         /* This inverts the alpha channel in GGAA */
+         else
+         {
+            png_bytep sp  = row + row_info->rowbytes;
+            png_bytep dp = sp;
+            png_uint_32 i;
+
+            for (i = 0; i < row_width; i++)
+            {
+               *(--dp) = (png_byte)(255 - *(--sp));
+               *(--dp) = (png_byte)(255 - *(--sp));
+/*
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+*/
+               sp-=2;
+               dp=sp;
+            }
+         }
+      }
+   }
+}
+#endif
+
+#ifdef PNG_READ_FILLER_SUPPORTED
+/* Add filler channel if we have RGB color */
+void /* PRIVATE */
+png_do_read_filler(png_row_infop row_info, png_bytep row,
+   png_uint_32 filler, png_uint_32 flags)
+{
+   png_uint_32 i;
+   png_uint_32 row_width = row_info->width;
+
+   png_byte hi_filler = (png_byte)((filler>>8) & 0xff);
+   png_byte lo_filler = (png_byte)(filler & 0xff);
+
+   png_debug(1, "in png_do_read_filler");
+
+   if (
+#ifdef PNG_USELESS_TESTS_SUPPORTED
+       row != NULL  && row_info != NULL &&
+#endif
+       row_info->color_type == PNG_COLOR_TYPE_GRAY)
+   {
+      if (row_info->bit_depth == 8)
+      {
+         /* This changes the data from G to GX */
+         if (flags & PNG_FLAG_FILLER_AFTER)
+         {
+            png_bytep sp = row + (png_size_t)row_width;
+            png_bytep dp =  sp + (png_size_t)row_width;
+            for (i = 1; i < row_width; i++)
+            {
+               *(--dp) = lo_filler;
+               *(--dp) = *(--sp);
+            }
+            *(--dp) = lo_filler;
+            row_info->channels = 2;
+            row_info->pixel_depth = 16;
+            row_info->rowbytes = row_width * 2;
+         }
+      /* This changes the data from G to XG */
+         else
+         {
+            png_bytep sp = row + (png_size_t)row_width;
+            png_bytep dp = sp  + (png_size_t)row_width;
+            for (i = 0; i < row_width; i++)
+            {
+               *(--dp) = *(--sp);
+               *(--dp) = lo_filler;
+            }
+            row_info->channels = 2;
+            row_info->pixel_depth = 16;
+            row_info->rowbytes = row_width * 2;
+         }
+      }
+      else if (row_info->bit_depth == 16)
+      {
+         /* This changes the data from GG to GGXX */
+         if (flags & PNG_FLAG_FILLER_AFTER)
+         {
+            png_bytep sp = row + (png_size_t)row_width * 2;
+            png_bytep dp = sp  + (png_size_t)row_width * 2;
+            for (i = 1; i < row_width; i++)
+            {
+               *(--dp) = hi_filler;
+               *(--dp) = lo_filler;
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+            }
+            *(--dp) = hi_filler;
+            *(--dp) = lo_filler;
+            row_info->channels = 2;
+            row_info->pixel_depth = 32;
+            row_info->rowbytes = row_width * 4;
+         }
+         /* This changes the data from GG to XXGG */
+         else
+         {
+            png_bytep sp = row + (png_size_t)row_width * 2;
+            png_bytep dp = sp  + (png_size_t)row_width * 2;
+            for (i = 0; i < row_width; i++)
+            {
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+               *(--dp) = hi_filler;
+               *(--dp) = lo_filler;
+            }
+            row_info->channels = 2;
+            row_info->pixel_depth = 32;
+            row_info->rowbytes = row_width * 4;
+         }
+      }
+   } /* COLOR_TYPE == GRAY */
+   else if (row_info->color_type == PNG_COLOR_TYPE_RGB)
+   {
+      if (row_info->bit_depth == 8)
+      {
+         /* This changes the data from RGB to RGBX */
+         if (flags & PNG_FLAG_FILLER_AFTER)
+         {
+            png_bytep sp = row + (png_size_t)row_width * 3;
+            png_bytep dp = sp  + (png_size_t)row_width;
+            for (i = 1; i < row_width; i++)
+            {
+               *(--dp) = lo_filler;
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+            }
+            *(--dp) = lo_filler;
+            row_info->channels = 4;
+            row_info->pixel_depth = 32;
+            row_info->rowbytes = row_width * 4;
+         }
+      /* This changes the data from RGB to XRGB */
+         else
+         {
+            png_bytep sp = row + (png_size_t)row_width * 3;
+            png_bytep dp = sp + (png_size_t)row_width;
+            for (i = 0; i < row_width; i++)
+            {
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+               *(--dp) = lo_filler;
+            }
+            row_info->channels = 4;
+            row_info->pixel_depth = 32;
+            row_info->rowbytes = row_width * 4;
+         }
+      }
+      else if (row_info->bit_depth == 16)
+      {
+         /* This changes the data from RRGGBB to RRGGBBXX */
+         if (flags & PNG_FLAG_FILLER_AFTER)
+         {
+            png_bytep sp = row + (png_size_t)row_width * 6;
+            png_bytep dp = sp  + (png_size_t)row_width * 2;
+            for (i = 1; i < row_width; i++)
+            {
+               *(--dp) = hi_filler;
+               *(--dp) = lo_filler;
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+            }
+            *(--dp) = hi_filler;
+            *(--dp) = lo_filler;
+            row_info->channels = 4;
+            row_info->pixel_depth = 64;
+            row_info->rowbytes = row_width * 8;
+         }
+         /* This changes the data from RRGGBB to XXRRGGBB */
+         else
+         {
+            png_bytep sp = row + (png_size_t)row_width * 6;
+            png_bytep dp = sp  + (png_size_t)row_width * 2;
+            for (i = 0; i < row_width; i++)
+            {
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+               *(--dp) = *(--sp);
+               *(--dp) = hi_filler;
+               *(--dp) = lo_filler;
+            }
+            row_info->channels = 4;
+            row_info->pixel_depth = 64;
+            row_info->rowbytes = row_width * 8;
+         }
+      }
+   } /* COLOR_TYPE == RGB */
+}
+#endif
+
+#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
+/* Expand grayscale files to RGB, with or without alpha */
+void /* PRIVATE */
+png_do_gray_to_rgb(png_row_infop row_info, png_bytep row)
+{
+   png_uint_32 i;
+   png_uint_32 row_width = row_info->width;
+
+   png_debug(1, "in png_do_gray_to_rgb");
+
+   if (row_info->bit_depth >= 8 &&
+#ifdef PNG_USELESS_TESTS_SUPPORTED
+       row != NULL && row_info != NULL &&
+#endif
+      !(row_info->color_type & PNG_COLOR_MASK_COLOR))
+   {
+      if (row_info->color_type == PNG_COLOR_TYPE_GRAY)
+      {
+         if (row_info->bit_depth == 8)
+         {
+            png_bytep sp = row + (png_size_t)row_width - 1;
+            png_bytep dp = sp  + (png_size_t)row_width * 2;
+            for (i = 0; i < row_width; i++)
+            {
+               *(dp--) = *sp;
+               *(dp--) = *sp;
+               *(dp--) = *(sp--);
+            }
+         }
+         else
+         {
+            png_bytep sp = row + (png_size_t)row_width * 2 - 1;
+            png_bytep dp = sp  + (png_size_t)row_width * 4;
+            for (i = 0; i < row_width; i++)
+            {
+               *(dp--) = *sp;
+               *(dp--) = *(sp - 1);
+               *(dp--) = *sp;
+               *(dp--) = *(sp - 1);
+               *(dp--) = *(sp--);
+               *(dp--) = *(sp--);
+            }
+         }
+      }
+      else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
+      {
+         if (row_info->bit_depth == 8)
+         {
+            png_bytep sp = row + (png_size_t)row_width * 2 - 1;
+            png_bytep dp = sp  + (png_size_t)row_width * 2;
+            for (i = 0; i < row_width; i++)
+            {
+               *(dp--) = *(sp--);
+               *(dp--) = *sp;
+               *(dp--) = *sp;
+               *(dp--) = *(sp--);
+            }
+         }
+         else
+         {
+            png_bytep sp = row + (png_size_t)row_width * 4 - 1;
+            png_bytep dp = sp  + (png_size_t)row_width * 4;
+            for (i = 0; i < row_width; i++)
+            {
+               *(dp--) = *(sp--);
+               *(dp--) = *(sp--);
+               *(dp--) = *sp;
+               *(dp--) = *(sp - 1);
+               *(dp--) = *sp;
+               *(dp--) = *(sp - 1);
+               *(dp--) = *(sp--);
+               *(dp--) = *(sp--);
+            }
+         }
+      }
+      row_info->channels += (png_byte)2;
+      row_info->color_type |= PNG_COLOR_MASK_COLOR;
+      row_info->pixel_depth = (png_byte)(row_info->channels *
+         row_info->bit_depth);
+      row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width);
+   }
+}
+#endif
+
+#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
+/* Reduce RGB files to grayscale, with or without alpha
+ * using the equation given in Poynton's ColorFAQ at
+ * <http://www.inforamp.net/~poynton/>  (THIS LINK IS DEAD June 2008)
+ * New link:
+ * <http://www.poynton.com/notes/colour_and_gamma/>
+ * Charles Poynton poynton at poynton.com
+ *
+ *     Y = 0.212671 * R + 0.715160 * G + 0.072169 * B
+ *
+ *  We approximate this with
+ *
+ *     Y = 0.21268 * R    + 0.7151 * G    + 0.07217 * B
+ *
+ *  which can be expressed with integers as
+ *
+ *     Y = (6969 * R + 23434 * G + 2365 * B)/32768
+ *
+ *  The calculation is to be done in a linear colorspace.
+ *
+ *  Other integer coefficents can be used via png_set_rgb_to_gray().
+ */
+int /* PRIVATE */
+png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
+
+{
+   png_uint_32 i;
+
+   png_uint_32 row_width = row_info->width;
+   int rgb_error = 0;
+
+   png_debug(1, "in png_do_rgb_to_gray");
+
+   if (
+#ifdef PNG_USELESS_TESTS_SUPPORTED
+       row != NULL && row_info != NULL &&
+#endif
+      (row_info->color_type & PNG_COLOR_MASK_COLOR))
+   {
+      png_uint_32 rc = png_ptr->rgb_to_gray_red_coeff;
+      png_uint_32 gc = png_ptr->rgb_to_gray_green_coeff;
+      png_uint_32 bc = png_ptr->rgb_to_gray_blue_coeff;
+
+      if (row_info->color_type == PNG_COLOR_TYPE_RGB)
+      {
+         if (row_info->bit_depth == 8)
+         {
+#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
+            if (png_ptr->gamma_from_1 != NULL && png_ptr->gamma_to_1 != NULL)
+            {
+               png_bytep sp = row;
+               png_bytep dp = row;
+
+               for (i = 0; i < row_width; i++)
+               {
+                  png_byte red   = png_ptr->gamma_to_1[*(sp++)];
+                  png_byte green = png_ptr->gamma_to_1[*(sp++)];
+                  png_byte blue  = png_ptr->gamma_to_1[*(sp++)];
+                  if (red != green || red != blue)
+                  {
+                     rgb_error |= 1;
+                     *(dp++) = png_ptr->gamma_from_1[
+                       (rc*red + gc*green + bc*blue)>>15];
+                  }
+                  else
+                     *(dp++) = *(sp - 1);
+               }
+            }
+            else
+#endif
+            {
+               png_bytep sp = row;
+               png_bytep dp = row;
+               for (i = 0; i < row_width; i++)
+               {
+                  png_byte red   = *(sp++);
+                  png_byte green = *(sp++);
+                  png_byte blue  = *(sp++);
+                  if (red != green || red != blue)
+                  {
+                     rgb_error |= 1;
+                     *(dp++) = (png_byte)((rc*red + gc*green + bc*blue)>>15);
+                  }
+                  else
+                     *(dp++) = *(sp - 1);
+               }
+            }
+         }
+
+         else /* RGB bit_depth == 16 */
+         {
+#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
+            if (png_ptr->gamma_16_to_1 != NULL &&
+                png_ptr->gamma_16_from_1 != NULL)
+            {
+               png_bytep sp = row;
+               png_bytep dp = row;
+               for (i = 0; i < row_width; i++)
+               {
+                  png_uint_16 red, green, blue, w;
+
+                  red   = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2;
+                  green = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2;
+                  blue  = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2;
+
+                  if (red == green && red == blue)
+                     w = red;
+                  else
+                  {
+                     png_uint_16 red_1   = png_ptr->gamma_16_to_1[(red&0xff) >>
+                                  png_ptr->gamma_shift][red>>8];
+                     png_uint_16 green_1 =
+                         png_ptr->gamma_16_to_1[(green&0xff) >>
+                                  png_ptr->gamma_shift][green>>8];
+                     png_uint_16 blue_1  = png_ptr->gamma_16_to_1[(blue&0xff) >>
+                                  png_ptr->gamma_shift][blue>>8];
+                     png_uint_16 gray16  = (png_uint_16)((rc*red_1 + gc*green_1
+                                  + bc*blue_1)>>15);
+                     w = png_ptr->gamma_16_from_1[(gray16&0xff) >>
+                         png_ptr->gamma_shift][gray16 >> 8];
+                     rgb_error |= 1;
+                  }
+
+                  *(dp++) = (png_byte)((w>>8) & 0xff);
+                  *(dp++) = (png_byte)(w & 0xff);
+               }
+            }
+            else
+#endif
+            {
+               png_bytep sp = row;
+               png_bytep dp = row;
+               for (i = 0; i < row_width; i++)
+               {
+                  png_uint_16 red, green, blue, gray16;
+
+                  red   = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2;
+                  green = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2;
+                  blue  = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2;
+
+                  if (red != green || red != blue)
+                     rgb_error |= 1;
+                  gray16  = (png_uint_16)((rc*red + gc*green + bc*blue)>>15);
+                  *(dp++) = (png_byte)((gray16>>8) & 0xff);
+                  *(dp++) = (png_byte)(gray16 & 0xff);
+               }
+            }
+         }
+      }
+      if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+      {
+         if (row_info->bit_depth == 8)
+         {
+#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
+            if (png_ptr->gamma_from_1 != NULL && png_ptr->gamma_to_1 != NULL)
+            {
+               png_bytep sp = row;
+               png_bytep dp = row;
+               for (i = 0; i < row_width; i++)
+               {
+                  png_byte red   = png_ptr->gamma_to_1[*(sp++)];
+                  png_byte green = png_ptr->gamma_to_1[*(sp++)];
+                  png_byte blue  = png_ptr->gamma_to_1[*(sp++)];
+                  if (red != green || red != blue)
+                     rgb_error |= 1;
+                  *(dp++) =  png_ptr->gamma_from_1
+                             [(rc*red + gc*green + bc*blue)>>15];
+                  *(dp++) = *(sp++);  /* alpha */
+               }
+            }
+            else
+#endif
+            {
+               png_bytep sp = row;
+               png_bytep dp = row;
+               for (i = 0; i < row_width; i++)
+               {
+                  png_byte red   = *(sp++);
+                  png_byte green = *(sp++);
+                  png_byte blue  = *(sp++);
+                  if (red != green || red != blue)
+                     rgb_error |= 1;
+                  *(dp++) =  (png_byte)((rc*red + gc*green + bc*blue)>>15);
+                  *(dp++) = *(sp++);  /* alpha */
+               }
+            }
+         }
+         else /* RGBA bit_depth == 16 */
+         {
+#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
+            if (png_ptr->gamma_16_to_1 != NULL &&
+                png_ptr->gamma_16_from_1 != NULL)
+            {
+               png_bytep sp = row;
+               png_bytep dp = row;
+               for (i = 0; i < row_width; i++)
+               {
+                  png_uint_16 red, green, blue, w;
+
+                  red   = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2;
+                  green = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2;
+                  blue  = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2;
+
+                  if (red == green && red == blue)
+                     w = red;
+                  else
+                  {
+                     png_uint_16 red_1   = png_ptr->gamma_16_to_1[(red&0xff) >>
+                         png_ptr->gamma_shift][red>>8];
+                     png_uint_16 green_1 =
+                         png_ptr->gamma_16_to_1[(green&0xff) >>
+                         png_ptr->gamma_shift][green>>8];
+                     png_uint_16 blue_1  = png_ptr->gamma_16_to_1[(blue&0xff) >>
+                         png_ptr->gamma_shift][blue>>8];
+                     png_uint_16 gray16  = (png_uint_16)((rc * red_1
+                         + gc * green_1 + bc * blue_1)>>15);
+                     w = png_ptr->gamma_16_from_1[(gray16&0xff) >>
+                         png_ptr->gamma_shift][gray16 >> 8];
+                     rgb_error |= 1;
+                  }
+
+                  *(dp++) = (png_byte)((w>>8) & 0xff);
+                  *(dp++) = (png_byte)(w & 0xff);
+                  *(dp++) = *(sp++);  /* alpha */
+                  *(dp++) = *(sp++);
+               }
+            }
+            else
+#endif
+            {
+               png_bytep sp = row;
+               png_bytep dp = row;
+               for (i = 0; i < row_width; i++)
+               {
+                  png_uint_16 red, green, blue, gray16;
+                  red   = (png_uint_16)((*(sp)<<8) | *(sp+1)); sp+=2;
+                  green = (png_uint_16)((*(sp)<<8) | *(sp+1)); sp+=2;
+                  blue  = (png_uint_16)((*(sp)<<8) | *(sp+1)); sp+=2;
+                  if (red != green || red != blue)
+                     rgb_error |= 1;
+                  gray16  = (png_uint_16)((rc*red + gc*green + bc*blue)>>15);
+                  *(dp++) = (png_byte)((gray16>>8) & 0xff);
+                  *(dp++) = (png_byte)(gray16 & 0xff);
+                  *(dp++) = *(sp++);  /* alpha */
+                  *(dp++) = *(sp++);
+               }
+            }
+         }
+      }
+   row_info->channels -= (png_byte)2;
+      row_info->color_type &= ~PNG_COLOR_MASK_COLOR;
+      row_info->pixel_depth = (png_byte)(row_info->channels *
+         row_info->bit_depth);
+      row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width);
+   }
+   return rgb_error;
+}
+#endif
+
+/* Build a grayscale palette.  Palette is assumed to be 1 << bit_depth
+ * large of png_color.  This lets grayscale images be treated as
+ * paletted.  Most useful for gamma correction and simplification
+ * of code.
+ */
+void PNGAPI
+png_build_grayscale_palette(int bit_depth, png_colorp palette)
+{
+   int num_palette;
+   int color_inc;
+   int i;
+   int v;
+
+   png_debug(1, "in png_do_build_grayscale_palette");
+
+   if (palette == NULL)
+      return;
+
+   switch (bit_depth)
+   {
+      case 1:
+         num_palette = 2;
+         color_inc = 0xff;
+         break;
+
+      case 2:
+         num_palette = 4;
+         color_inc = 0x55;
+         break;
+
+      case 4:
+         num_palette = 16;
+         color_inc = 0x11;
+         break;
+
+      case 8:
+         num_palette = 256;
+         color_inc = 1;
+         break;
+
+      default:
+         num_palette = 0;
+         color_inc = 0;
+         break;
+   }
+
+   for (i = 0, v = 0; i < num_palette; i++, v += color_inc)
+   {
+      palette[i].red = (png_byte)v;
+      palette[i].green = (png_byte)v;
+      palette[i].blue = (png_byte)v;
+   }
+}
+
+/* This function is currently unused.  Do we really need it? */
+#if defined(PNG_READ_DITHER_SUPPORTED) && \
+  defined(PNG_CORRECT_PALETTE_SUPPORTED)
+void /* PRIVATE */
+png_correct_palette(png_structp png_ptr, png_colorp palette,
+   int num_palette)
+{
+   png_debug(1, "in png_correct_palette");
+
+#if defined(PNG_READ_BACKGROUND_SUPPORTED) && \
+    defined(PNG_READ_GAMMA_SUPPORTED) && \
+  defined(PNG_FLOATING_POINT_SUPPORTED)
+   if (png_ptr->transformations & (PNG_GAMMA | PNG_BACKGROUND))
+   {
+      png_color back, back_1;
+
+      if (png_ptr->background_gamma_type == PNG_BACKGROUND_GAMMA_FILE)
+      {
+         back.red = png_ptr->gamma_table[png_ptr->background.red];
+         back.green = png_ptr->gamma_table[png_ptr->background.green];
+         back.blue = png_ptr->gamma_table[png_ptr->background.blue];
+
+         back_1.red = png_ptr->gamma_to_1[png_ptr->background.red];
+         back_1.green = png_ptr->gamma_to_1[png_ptr->background.green];
+         back_1.blue = png_ptr->gamma_to_1[png_ptr->background.blue];
+      }
+      else
+      {
+         double g;
+
+         g = 1.0 / (png_ptr->background_gamma * png_ptr->screen_gamma);
+
+         if (png_ptr->background_gamma_type == PNG_BACKGROUND_GAMMA_SCREEN
+             || fabs(g - 1.0) < PNG_GAMMA_THRESHOLD)
+         {
+            back.red = png_ptr->background.red;
+            back.green = png_ptr->background.green;
+            back.blue = png_ptr->background.blue;
+         }
+         else
+         {
+            back.red =
+               (png_byte)(pow((double)png_ptr->background.red/255, g) *
+                255.0 + 0.5);
+            back.green =
+               (png_byte)(pow((double)png_ptr->background.green/255, g) *
+                255.0 + 0.5);
+            back.blue =
+               (png_byte)(pow((double)png_ptr->background.blue/255, g) *
+                255.0 + 0.5);
+         }
+
+         g = 1.0 / png_ptr->background_gamma;
+
+         back_1.red =
+            (png_byte)(pow((double)png_ptr->background.red/255, g) *
+             255.0 + 0.5);
+         back_1.green =
+            (png_byte)(pow((double)png_ptr->background.green/255, g) *
+             255.0 + 0.5);
+         back_1.blue =
+            (png_byte)(pow((double)png_ptr->background.blue/255, g) *
+             255.0 + 0.5);
+      }
+
+      if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
+      {
+         png_uint_32 i;
+
+         for (i = 0; i < (png_uint_32)num_palette; i++)
+         {
+            if (i < png_ptr->num_trans && png_ptr->trans[i] == 0)
+            {
+               palette[i] = back;
+            }
+            else if (i < png_ptr->num_trans && png_ptr->trans[i] != 0xff)
+            {
+               png_byte v, w;
+
+               v = png_ptr->gamma_to_1[png_ptr->palette[i].red];
+               png_composite(w, v, png_ptr->trans[i], back_1.red);
+               palette[i].red = png_ptr->gamma_from_1[w];
+
+               v = png_ptr->gamma_to_1[png_ptr->palette[i].green];
+               png_composite(w, v, png_ptr->trans[i], back_1.green);
+               palette[i].green = png_ptr->gamma_from_1[w];
+
+               v = png_ptr->gamma_to_1[png_ptr->palette[i].blue];
+               png_composite(w, v, png_ptr->trans[i], back_1.blue);
+               palette[i].blue = png_ptr->gamma_from_1[w];
+            }
+            else
+            {
+               palette[i].red = png_ptr->gamma_table[palette[i].red];
+               palette[i].green = png_ptr->gamma_table[palette[i].green];
+               palette[i].blue = png_ptr->gamma_table[palette[i].blue];
+            }
+         }
+      }
+      else
+      {
+         int i;
+
+         for (i = 0; i < num_palette; i++)
+         {
+            if (palette[i].red == (png_byte)png_ptr->trans_values.gray)
+            {
+               palette[i] = back;
+            }
+            else
+            {
+               palette[i].red = png_ptr->gamma_table[palette[i].red];
+               palette[i].green = png_ptr->gamma_table[palette[i].green];
+               palette[i].blue = png_ptr->gamma_table[palette[i].blue];
+            }
+         }
+      }
+   }
+   else
+#endif
+#ifdef PNG_READ_GAMMA_SUPPORTED
+   if (png_ptr->transformations & PNG_GAMMA)
+   {
+      int i;
+
+      for (i = 0; i < num_palette; i++)
+      {
+         palette[i].red = png_ptr->gamma_table[palette[i].red];
+         palette[i].green = png_ptr->gamma_table[palette[i].green];
+         palette[i].blue = png_ptr->gamma_table[palette[i].blue];
+      }
+   }
+#ifdef PNG_READ_BACKGROUND_SUPPORTED
+   else
+#endif
+#endif
+#ifdef PNG_READ_BACKGROUND_SUPPORTED
+   if (png_ptr->transformations & PNG_BACKGROUND)
+   {
+      if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
+      {
+         png_color back;
+
+         back.red   = (png_byte)png_ptr->background.red;
+         back.green = (png_byte)png_ptr->background.green;
+         back.blue  = (png_byte)png_ptr->background.blue;
+
+         for (i = 0; i < (int)png_ptr->num_trans; i++)
+         {
+            if (png_ptr->trans[i] == 0)
+            {
+               palette[i].red = back.red;
+               palette[i].green = back.green;
+               palette[i].blue = back.blue;
+            }
+            else if (png_ptr->trans[i] != 0xff)
+            {
+               png_composite(palette[i].red, png_ptr->palette[i].red,
+                  png_ptr->trans[i], back.red);
+               png_composite(palette[i].green, png_ptr->palette[i].green,
+                  png_ptr->trans[i], back.green);
+               png_composite(palette[i].blue, png_ptr->palette[i].blue,
+                  png_ptr->trans[i], back.blue);
+            }
+         }
+      }
+      else /* Assume grayscale palette (what else could it be?) */
+      {
+         int i;
+
+         for (i = 0; i < num_palette; i++)
+         {
+            if (i == (png_byte)png_ptr->trans_values.gray)
+            {
+               palette[i].red = (png_byte)png_ptr->background.red;
+               palette[i].green = (png_byte)png_ptr->background.green;
+               palette[i].blue = (png_byte)png_ptr->background.blue;
+            }
+         }
+      }
+   }
+#endif
+}
+#endif
+
+#ifdef PNG_READ_BACKGROUND_SUPPORTED
+/* Replace any alpha or transparency with the supplied background color.
+ * "background" is already in the screen gamma, while "background_1" is
+ * at a gamma of 1.0.  Paletted files have already been taken care of.
+ */
+void /* PRIVATE */
+png_do_background(png_row_infop row_info, png_bytep row,
+   png_color_16p trans_values, png_color_16p background
+#ifdef PNG_READ_GAMMA_SUPPORTED
+   , png_color_16p background_1,
+   png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
+   png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
+   png_uint_16pp gamma_16_to_1, int gamma_shift
+#endif
+   )
+{
+   png_bytep sp, dp;
+   png_uint_32 i;
+   png_uint_32 row_width=row_info->width;
+   int shift;
+
+   png_debug(1, "in png_do_background");
+
+   if (background != NULL &&
+#ifdef PNG_USELESS_TESTS_SUPPORTED
+       row != NULL && row_info != NULL &&
+#endif
+      (!(row_info->color_type & PNG_COLOR_MASK_ALPHA) ||
+      (row_info->color_type != PNG_COLOR_TYPE_PALETTE && trans_values)))
+   {
+      switch (row_info->color_type)
+      {
+         case PNG_COLOR_TYPE_GRAY:
+         {
+            switch (row_info->bit_depth)
+            {
+               case 1:
+               {
+                  sp = row;
+                  shift = 7;
+                  for (i = 0; i < row_width; i++)
+                  {
+                     if ((png_uint_16)((*sp >> shift) & 0x01)
+                        == trans_values->gray)
+                     {
+                        *sp &= (png_byte)((0x7f7f >> (7 - shift)) & 0xff);
+                        *sp |= (png_byte)(background->gray << shift);
+                     }
+                     if (!shift)
+                     {
+                        shift = 7;
+                        sp++;
+                     }
+                     else
+                        shift--;
+                  }
+                  break;
+               }
+
+               case 2:
+               {
+#ifdef PNG_READ_GAMMA_SUPPORTED
+                  if (gamma_table != NULL)
+                  {
+                     sp = row;
+                     shift = 6;
+                     for (i = 0; i < row_width; i++)
+                     {
+                        if ((png_uint_16)((*sp >> shift) & 0x03)
+                            == trans_values->gray)
+                        {
+                           *sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff);
+                           *sp |= (png_byte)(background->gray << shift);
+                        }
+                        else
+                        {
+                           png_byte p = (png_byte)((*sp >> shift) & 0x03);
+                           png_byte g = (png_byte)((gamma_table [p | (p << 2) |
+                               (p << 4) | (p << 6)] >> 6) & 0x03);
+                           *sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff);
+                           *sp |= (png_byte)(g << shift);
+                        }
+                        if (!shift)
+                        {
+                           shift = 6;
+                           sp++;
+                        }
+                        else
+                           shift -= 2;
+                     }
+                  }
+                  else
+#endif
+                  {
+                     sp = row;
+                     shift = 6;
+                     for (i = 0; i < row_width; i++)
+                     {
+                        if ((png_uint_16)((*sp >> shift) & 0x03)
+                            == trans_values->gray)
+                        {
+                           *sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff);
+                           *sp |= (png_byte)(background->gray << shift);
+                        }
+                        if (!shift)
+                        {
+                           shift = 6;
+                           sp++;
+                        }
+                        else
+                           shift -= 2;
+                     }
+                  }
+                  break;
+               }
+
+               case 4:
+               {
+#ifdef PNG_READ_GAMMA_SUPPORTED
+                  if (gamma_table != NULL)
+                  {
+                     sp = row;
+                     shift = 4;
+                     for (i = 0; i < row_width; i++)
+                     {
+                        if ((png_uint_16)((*sp >> shift) & 0x0f)
+                            == trans_values->gray)
+                        {
+                           *sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff);
+                           *sp |= (png_byte)(background->gray << shift);
+                        }
+                        else
+                        {
+                           png_byte p = (png_byte)((*sp >> shift) & 0x0f);
+                           png_byte g = (png_byte)((gamma_table[p |
+                             (p << 4)] >> 4) & 0x0f);
+                           *sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff);
+                           *sp |= (png_byte)(g << shift);
+                        }
+                        if (!shift)
+                        {
+                           shift = 4;
+                           sp++;
+                        }
+                        else
+                           shift -= 4;
+                     }
+                  }
+                  else
+#endif
+                  {
+                     sp = row;
+                     shift = 4;
+                     for (i = 0; i < row_width; i++)
+                     {
+                        if ((png_uint_16)((*sp >> shift) & 0x0f)
+                            == trans_values->gray)
+                        {
+                           *sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff);
+                           *sp |= (png_byte)(background->gray << shift);
+                        }
+                        if (!shift)
+                        {
+                           shift = 4;
+                           sp++;
+                        }
+                        else
+                           shift -= 4;
+                     }
+                  }
+                  break;
+               }
+
+               case 8:
+               {
+#ifdef PNG_READ_GAMMA_SUPPORTED
+                  if (gamma_table != NULL)
+                  {
+                     sp = row;
+                     for (i = 0; i < row_width; i++, sp++)
+                     {
+                        if (*sp == trans_values->gray)
+                        {
+                           *sp = (png_byte)background->gray;
+                        }
+                        else
+                        {
+                           *sp = gamma_table[*sp];
+                        }
+                     }
+                  }
+                  else
+#endif
+                  {
+                     sp = row;
+                     for (i = 0; i < row_width; i++, sp++)
+                     {
+                        if (*sp == trans_values->gray)
+                        {
+                           *sp = (png_byte)background->gray;
+                        }
+                     }
+                  }
+                  break;
+               }
+
+               case 16:
+               {
+#ifdef PNG_READ_GAMMA_SUPPORTED
+                  if (gamma_16 != NULL)
+                  {
+                     sp = row;
+                     for (i = 0; i < row_width; i++, sp += 2)
+                     {
+                        png_uint_16 v;
+
+                        v = (png_uint_16)(((*sp) << 8) + *(sp + 1));
+                        if (v == trans_values->gray)
+                        {
+                           /* Background is already in screen gamma */
+                           *sp = (png_byte)((background->gray >> 8) & 0xff);
+                           *(sp + 1) = (png_byte)(background->gray & 0xff);
+                        }
+                        else
+                        {
+                           v = gamma_16[*(sp + 1) >> gamma_shift][*sp];
+                           *sp = (png_byte)((v >> 8) & 0xff);
+                           *(sp + 1) = (png_byte)(v & 0xff);
+                        }
+                     }
+                  }
+                  else
+#endif
+                  {
+                     sp = row;
+                     for (i = 0; i < row_width; i++, sp += 2)
+                     {
+                        png_uint_16 v;
+
+                        v = (png_uint_16)(((*sp) << 8) + *(sp + 1));
+                        if (v == trans_values->gray)
+                        {
+                           *sp = (png_byte)((background->gray >> 8) & 0xff);
+                           *(sp + 1) = (png_byte)(background->gray & 0xff);
+                        }
+                     }
+                  }
+                  break;
+               }
+            }
+            break;
+         }
+
+         case PNG_COLOR_TYPE_RGB:
+         {
+            if (row_info->bit_depth == 8)
+            {
+#ifdef PNG_READ_GAMMA_SUPPORTED
+               if (gamma_table != NULL)
+               {
+                  sp = row;
+                  for (i = 0; i < row_width; i++, sp += 3)
+                  {
+                     if (*sp == trans_values->red &&
+                        *(sp + 1) == trans_values->green &&
+                        *(sp + 2) == trans_values->blue)
+                     {
+                        *sp = (png_byte)background->red;
+                        *(sp + 1) = (png_byte)background->green;
+                        *(sp + 2) = (png_byte)background->blue;
+                     }
+                     else
+                     {
+                        *sp = gamma_table[*sp];
+                        *(sp + 1) = gamma_table[*(sp + 1)];
+                        *(sp + 2) = gamma_table[*(sp + 2)];
+                     }
+                  }
+               }
+               else
+#endif
+               {
+                  sp = row;
+                  for (i = 0; i < row_width; i++, sp += 3)
+                  {
+                     if (*sp == trans_values->red &&
+                        *(sp + 1) == trans_values->green &&
+                        *(sp + 2) == trans_values->blue)
+                     {
+                        *sp = (png_byte)background->red;
+                        *(sp + 1) = (png_byte)background->green;
+                        *(sp + 2) = (png_byte)background->blue;
+                     }
+                  }
+               }
+            }
+            else /* if (row_info->bit_depth == 16) */
+            {
+#ifdef PNG_READ_GAMMA_SUPPORTED
+               if (gamma_16 != NULL)
+               {
+                  sp = row;
+                  for (i = 0; i < row_width; i++, sp += 6)
+                  {
+                     png_uint_16 r = (png_uint_16)(((*sp) << 8) + *(sp + 1));
+                     png_uint_16 g = (png_uint_16)(((*(sp+2)) << 8) + *(sp+3));
+                     png_uint_16 b = (png_uint_16)(((*(sp+4)) << 8) + *(sp+5));
+                     if (r == trans_values->red && g == trans_values->green &&
+                        b == trans_values->blue)
+                     {
+                        /* Background is already in screen gamma */
+                        *sp = (png_byte)((background->red >> 8) & 0xff);
+                        *(sp + 1) = (png_byte)(background->red & 0xff);
+                        *(sp + 2) = (png_byte)((background->green >> 8) & 0xff);
+                        *(sp + 3) = (png_byte)(background->green & 0xff);
+                        *(sp + 4) = (png_byte)((background->blue >> 8) & 0xff);
+                        *(sp + 5) = (png_byte)(background->blue & 0xff);
+                     }
+                     else
+                     {
+                        png_uint_16 v = gamma_16[*(sp + 1) >> gamma_shift][*sp];
+                        *sp = (png_byte)((v >> 8) & 0xff);
+                        *(sp + 1) = (png_byte)(v & 0xff);
+                        v = gamma_16[*(sp + 3) >> gamma_shift][*(sp + 2)];
+                        *(sp + 2) = (png_byte)((v >> 8) & 0xff);
+                        *(sp + 3) = (png_byte)(v & 0xff);
+                        v = gamma_16[*(sp + 5) >> gamma_shift][*(sp + 4)];
+                        *(sp + 4) = (png_byte)((v >> 8) & 0xff);
+                        *(sp + 5) = (png_byte)(v & 0xff);
+                     }
+                  }
+               }
+               else
+#endif
+               {
+                  sp = row;
+                  for (i = 0; i < row_width; i++, sp += 6)
+                  {
+                     png_uint_16 r = (png_uint_16)(((*sp) << 8) + *(sp+1));
+                     png_uint_16 g = (png_uint_16)(((*(sp+2)) << 8) + *(sp+3));
+                     png_uint_16 b = (png_uint_16)(((*(sp+4)) << 8) + *(sp+5));
+
+                     if (r == trans_values->red && g == trans_values->green &&
+                        b == trans_values->blue)
+                     {
+                        *sp = (png_byte)((background->red >> 8) & 0xff);
+                        *(sp + 1) = (png_byte)(background->red & 0xff);
+                        *(sp + 2) = (png_byte)((background->green >> 8) & 0xff);
+                        *(sp + 3) = (png_byte)(background->green & 0xff);
+                        *(sp + 4) = (png_byte)((background->blue >> 8) & 0xff);
+                        *(sp + 5) = (png_byte)(background->blue & 0xff);
+                     }
+                  }
+               }
+            }
+            break;
+         }
+
+         case PNG_COLOR_TYPE_GRAY_ALPHA:
+         {
+            if (row_info->bit_depth == 8)
+            {
+#ifdef PNG_READ_GAMMA_SUPPORTED
+               if (gamma_to_1 != NULL && gamma_from_1 != NULL &&
+                   gamma_table != NULL)
+               {
+                  sp = row;
+                  dp = row;
+                  for (i = 0; i < row_width; i++, sp += 2, dp++)
+                  {
+                     png_uint_16 a = *(sp + 1);
+
+                     if (a == 0xff)
+                     {
+                        *dp = gamma_table[*sp];
+                     }
+                     else if (a == 0)
+                     {
+                        /* Background is already in screen gamma */
+                        *dp = (png_byte)background->gray;
+                     }
+                     else
+                     {
+                        png_byte v, w;
+
+                        v = gamma_to_1[*sp];
+                        png_composite(w, v, a, background_1->gray);
+                        *dp = gamma_from_1[w];
+                     }
+                  }
+               }
+               else
+#endif
+               {
+                  sp = row;
+                  dp = row;
+                  for (i = 0; i < row_width; i++, sp += 2, dp++)
+                  {
+                     png_byte a = *(sp + 1);
+
+                     if (a == 0xff)
+                     {
+                        *dp = *sp;
+                     }
+#ifdef PNG_READ_GAMMA_SUPPORTED
+                     else if (a == 0)
+                     {
+                        *dp = (png_byte)background->gray;
+                     }
+                     else
+                     {
+                        png_composite(*dp, *sp, a, background_1->gray);
+                     }
+#else
+                     *dp = (png_byte)background->gray;
+#endif
+                  }
+               }
+            }
+            else /* if (png_ptr->bit_depth == 16) */
+            {
+#ifdef PNG_READ_GAMMA_SUPPORTED
+               if (gamma_16 != NULL && gamma_16_from_1 != NULL &&
+                   gamma_16_to_1 != NULL)
+               {
+                  sp = row;
+                  dp = row;
+                  for (i = 0; i < row_width; i++, sp += 4, dp += 2)
+                  {
+                     png_uint_16 a = (png_uint_16)(((*(sp+2)) << 8) + *(sp+3));
+
+                     if (a == (png_uint_16)0xffff)
+                     {
+                        png_uint_16 v;
+
+                        v = gamma_16[*(sp + 1) >> gamma_shift][*sp];
+                        *dp = (png_byte)((v >> 8) & 0xff);
+                        *(dp + 1) = (png_byte)(v & 0xff);
+                     }
+#ifdef PNG_READ_GAMMA_SUPPORTED
+                     else if (a == 0)
+#else
+                     else
+#endif
+                     {
+                        /* Background is already in screen gamma */
+                        *dp = (png_byte)((background->gray >> 8) & 0xff);
+                        *(dp + 1) = (png_byte)(background->gray & 0xff);
+                     }
+#ifdef PNG_READ_GAMMA_SUPPORTED
+                     else
+                     {
+                        png_uint_16 g, v, w;
+
+                        g = gamma_16_to_1[*(sp + 1) >> gamma_shift][*sp];
+                        png_composite_16(v, g, a, background_1->gray);
+                        w = gamma_16_from_1[(v&0xff) >> gamma_shift][v >> 8];
+                        *dp = (png_byte)((w >> 8) & 0xff);
+                        *(dp + 1) = (png_byte)(w & 0xff);
+                     }
+#endif
+                  }
+               }
+               else
+#endif
+               {
+                  sp = row;
+                  dp = row;
+                  for (i = 0; i < row_width; i++, sp += 4, dp += 2)
+                  {
+                     png_uint_16 a = (png_uint_16)(((*(sp+2)) << 8) + *(sp+3));
+                     if (a == (png_uint_16)0xffff)
+                     {
+                        png_memcpy(dp, sp, 2);
+                     }
+#ifdef PNG_READ_GAMMA_SUPPORTED
+                     else if (a == 0)
+#else
+                     else
+#endif
+                     {
+                        *dp = (png_byte)((background->gray >> 8) & 0xff);
+                        *(dp + 1) = (png_byte)(background->gray & 0xff);
+                     }
+#ifdef PNG_READ_GAMMA_SUPPORTED
+                     else
+                     {
+                        png_uint_16 g, v;
+
+                        g = (png_uint_16)(((*sp) << 8) + *(sp + 1));
+                        png_composite_16(v, g, a, background_1->gray);
+                        *dp = (png_byte)((v >> 8) & 0xff);
+                        *(dp + 1) = (png_byte)(v & 0xff);
+                     }
+#endif
+                  }
+               }
+            }
+            break;
+         }
+
+         case PNG_COLOR_TYPE_RGB_ALPHA:
+         {
+            if (row_info->bit_depth == 8)
+            {
+#ifdef PNG_READ_GAMMA_SUPPORTED
+               if (gamma_to_1 != NULL && gamma_from_1 != NULL &&
+                   gamma_table != NULL)
+               {
+                  sp = row;
+                  dp = row;
+                  for (i = 0; i < row_width; i++, sp += 4, dp += 3)
+                  {
+                     png_byte a = *(sp + 3);
+
+                     if (a == 0xff)
+                     {
+                        *dp = gamma_table[*sp];
+                        *(dp + 1) = gamma_table[*(sp + 1)];
+                        *(dp + 2) = gamma_table[*(sp + 2)];
+                     }
+                     else if (a == 0)
+                     {
+                        /* Background is already in screen gamma */
+                        *dp = (png_byte)background->red;
+                        *(dp + 1) = (png_byte)background->green;
+                        *(dp + 2) = (png_byte)background->blue;
+                     }
+                     else
+                     {
+                        png_byte v, w;
+
+                        v = gamma_to_1[*sp];
+                        png_composite(w, v, a, background_1->red);
+                        *dp = gamma_from_1[w];
+                        v = gamma_to_1[*(sp + 1)];
+                        png_composite(w, v, a, background_1->green);
+                        *(dp + 1) = gamma_from_1[w];
+                        v = gamma_to_1[*(sp + 2)];
+                        png_composite(w, v, a, background_1->blue);
+                        *(dp + 2) = gamma_from_1[w];
+                     }
+                  }
+               }
+               else
+#endif
+               {
+                  sp = row;
+                  dp = row;
+                  for (i = 0; i < row_width; i++, sp += 4, dp += 3)
+                  {
+                     png_byte a = *(sp + 3);
+
+                     if (a == 0xff)
+                     {
+                        *dp = *sp;
+                        *(dp + 1) = *(sp + 1);
+                        *(dp + 2) = *(sp + 2);
+                     }
+                     else if (a == 0)
+                     {
+                        *dp = (png_byte)background->red;
+                        *(dp + 1) = (png_byte)background->green;
+                        *(dp + 2) = (png_byte)background->blue;
+                     }
+                     else
+                     {
+                        png_composite(*dp, *sp, a, background->red);
+                        png_composite(*(dp + 1), *(sp + 1), a,
+                           background->green);
+                        png_composite(*(dp + 2), *(sp + 2), a,
+                           background->blue);
+                     }
+                  }
+               }
+            }
+            else /* if (row_info->bit_depth == 16) */
+            {
+#ifdef PNG_READ_GAMMA_SUPPORTED
+               if (gamma_16 != NULL && gamma_16_from_1 != NULL &&
+                   gamma_16_to_1 != NULL)
+               {
+                  sp = row;
+                  dp = row;
+                  for (i = 0; i < row_width; i++, sp += 8, dp += 6)
+                  {
+                     png_uint_16 a = (png_uint_16)(((png_uint_16)(*(sp + 6))
+                         << 8) + (png_uint_16)(*(sp + 7)));
+                     if (a == (png_uint_16)0xffff)
+                     {
+                        png_uint_16 v;
+
+                        v = gamma_16[*(sp + 1) >> gamma_shift][*sp];
+                        *dp = (png_byte)((v >> 8) & 0xff);
+                        *(dp + 1) = (png_byte)(v & 0xff);
+                        v = gamma_16[*(sp + 3) >> gamma_shift][*(sp + 2)];
+                        *(dp + 2) = (png_byte)((v >> 8) & 0xff);
+                        *(dp + 3) = (png_byte)(v & 0xff);
+                        v = gamma_16[*(sp + 5) >> gamma_shift][*(sp + 4)];
+                        *(dp + 4) = (png_byte)((v >> 8) & 0xff);
+                        *(dp + 5) = (png_byte)(v & 0xff);
+                     }
+                     else if (a == 0)
+                     {
+                        /* Background is already in screen gamma */
+                        *dp = (png_byte)((background->red >> 8) & 0xff);
+                        *(dp + 1) = (png_byte)(background->red & 0xff);
+                        *(dp + 2) = (png_byte)((background->green >> 8) & 0xff);
+                        *(dp + 3) = (png_byte)(background->green & 0xff);
+                        *(dp + 4) = (png_byte)((background->blue >> 8) & 0xff);
+                        *(dp + 5) = (png_byte)(background->blue & 0xff);
+                     }
+                     else
+                     {
+                        png_uint_16 v, w, x;
+
+                        v = gamma_16_to_1[*(sp + 1) >> gamma_shift][*sp];
+                        png_composite_16(w, v, a, background_1->red);
+                        x = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> 8];
+                        *dp = (png_byte)((x >> 8) & 0xff);
+                        *(dp + 1) = (png_byte)(x & 0xff);
+                        v = gamma_16_to_1[*(sp + 3) >> gamma_shift][*(sp + 2)];
+                        png_composite_16(w, v, a, background_1->green);
+                        x = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> 8];
+                        *(dp + 2) = (png_byte)((x >> 8) & 0xff);
+                        *(dp + 3) = (png_byte)(x & 0xff);
+                        v = gamma_16_to_1[*(sp + 5) >> gamma_shift][*(sp + 4)];
+                        png_composite_16(w, v, a, background_1->blue);
+                        x = gamma_16_from_1[(w & 0xff) >> gamma_shift][w >> 8];
+                        *(dp + 4) = (png_byte)((x >> 8) & 0xff);
+                        *(dp + 5) = (png_byte)(x & 0xff);
+                     }
+                  }
+               }
+               else
+#endif
+               {
+                  sp = row;
+                  dp = row;
+                  for (i = 0; i < row_width; i++, sp += 8, dp += 6)
+                  {
+                     png_uint_16 a = (png_uint_16)(((png_uint_16)(*(sp + 6))
+                        << 8) + (png_uint_16)(*(sp + 7)));
+                     if (a == (png_uint_16)0xffff)
+                     {
+                        png_memcpy(dp, sp, 6);
+                     }
+                     else if (a == 0)
+                     {
+                        *dp = (png_byte)((background->red >> 8) & 0xff);
+                        *(dp + 1) = (png_byte)(background->red & 0xff);
+                        *(dp + 2) = (png_byte)((background->green >> 8) & 0xff);
+                        *(dp + 3) = (png_byte)(background->green & 0xff);
+                        *(dp + 4) = (png_byte)((background->blue >> 8) & 0xff);
+                        *(dp + 5) = (png_byte)(background->blue & 0xff);
+                     }
+                     else
+                     {
+                        png_uint_16 v;
+
+                        png_uint_16 r = (png_uint_16)(((*sp) << 8) + *(sp + 1));
+                        png_uint_16 g = (png_uint_16)(((*(sp + 2)) << 8)
+                            + *(sp + 3));
+                        png_uint_16 b = (png_uint_16)(((*(sp + 4)) << 8)
+                            + *(sp + 5));
+
+                        png_composite_16(v, r, a, background->red);
+                        *dp = (png_byte)((v >> 8) & 0xff);
+                        *(dp + 1) = (png_byte)(v & 0xff);
+                        png_composite_16(v, g, a, background->green);
+                        *(dp + 2) = (png_byte)((v >> 8) & 0xff);
+                        *(dp + 3) = (png_byte)(v & 0xff);
+                        png_composite_16(v, b, a, background->blue);
+                        *(dp + 4) = (png_byte)((v >> 8) & 0xff);
+                        *(dp + 5) = (png_byte)(v & 0xff);
+                     }
+                  }
+               }
+            }
+            break;
+         }
+      }
+
+      if (row_info->color_type & PNG_COLOR_MASK_ALPHA)
+      {
+         row_info->color_type &= ~PNG_COLOR_MASK_ALPHA;
+         row_info->channels--;
+         row_info->pixel_depth = (png_byte)(row_info->channels *
+            row_info->bit_depth);
+         row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width);
+      }
+   }
+}
+#endif
+
+#ifdef PNG_READ_GAMMA_SUPPORTED
+/* Gamma correct the image, avoiding the alpha channel.  Make sure
+ * you do this after you deal with the transparency issue on grayscale
+ * or RGB images. If your bit depth is 8, use gamma_table, if it
+ * is 16, use gamma_16_table and gamma_shift.  Build these with
+ * build_gamma_table().
+ */
+void /* PRIVATE */
+png_do_gamma(png_row_infop row_info, png_bytep row,
+   png_bytep gamma_table, png_uint_16pp gamma_16_table,
+   int gamma_shift)
+{
+   png_bytep sp;
+   png_uint_32 i;
+   png_uint_32 row_width=row_info->width;
+
+   png_debug(1, "in png_do_gamma");
+
+   if (
+#ifdef PNG_USELESS_TESTS_SUPPORTED
+       row != NULL && row_info != NULL &&
+#endif
+       ((row_info->bit_depth <= 8 && gamma_table != NULL) ||
+        (row_info->bit_depth == 16 && gamma_16_table != NULL)))
+   {
+      switch (row_info->color_type)
+      {
+         case PNG_COLOR_TYPE_RGB:
+         {
+            if (row_info->bit_depth == 8)
+            {
+               sp = row;
+               for (i = 0; i < row_width; i++)
+               {
+                  *sp = gamma_table[*sp];
+                  sp++;
+                  *sp = gamma_table[*sp];
+                  sp++;
+                  *sp = gamma_table[*sp];
+                  sp++;
+               }
+            }
+            else /* if (row_info->bit_depth == 16) */
+            {
+               sp = row;
+               for (i = 0; i < row_width; i++)
+               {
+                  png_uint_16 v;
+
+                  v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
+                  *sp = (png_byte)((v >> 8) & 0xff);
+                  *(sp + 1) = (png_byte)(v & 0xff);
+                  sp += 2;
+                  v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
+                  *sp = (png_byte)((v >> 8) & 0xff);
+                  *(sp + 1) = (png_byte)(v & 0xff);
+                  sp += 2;
+                  v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
+                  *sp = (png_byte)((v >> 8) & 0xff);
+                  *(sp + 1) = (png_byte)(v & 0xff);
+                  sp += 2;
+               }
+            }
+            break;
+         }
+
+         case PNG_COLOR_TYPE_RGB_ALPHA:
+         {
+            if (row_info->bit_depth == 8)
+            {
+               sp = row;
+               for (i = 0; i < row_width; i++)
+               {
+                  *sp = gamma_table[*sp];
+                  sp++;
+                  *sp = gamma_table[*sp];
+                  sp++;
+                  *sp = gamma_table[*sp];
+                  sp++;
+                  sp++;
+               }
+            }
+            else /* if (row_info->bit_depth == 16) */
+            {
+               sp = row;
+               for (i = 0; i < row_width; i++)
+               {
+                  png_uint_16 v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
+                  *sp = (png_byte)((v >> 8) & 0xff);
+                  *(sp + 1) = (png_byte)(v & 0xff);
+                  sp += 2;
+                  v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
+                  *sp = (png_byte)((v >> 8) & 0xff);
+                  *(sp + 1) = (png_byte)(v & 0xff);
+                  sp += 2;
+                  v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
+                  *sp = (png_byte)((v >> 8) & 0xff);
+                  *(sp + 1) = (png_byte)(v & 0xff);
+                  sp += 4;
+               }
+            }
+            break;
+         }
+
+         case PNG_COLOR_TYPE_GRAY_ALPHA:
+         {
+            if (row_info->bit_depth == 8)
+            {
+               sp = row;
+               for (i = 0; i < row_width; i++)
+               {
+                  *sp = gamma_table[*sp];
+                  sp += 2;
+               }
+            }
+            else /* if (row_info->bit_depth == 16) */
+            {
+               sp = row;
+               for (i = 0; i < row_width; i++)
+               {
+                  png_uint_16 v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
+                  *sp = (png_byte)((v >> 8) & 0xff);
+                  *(sp + 1) = (png_byte)(v & 0xff);
+                  sp += 4;
+               }
+            }
+            break;
+         }
+
+         case PNG_COLOR_TYPE_GRAY:
+         {
+            if (row_info->bit_depth == 2)
+            {
+               sp = row;
+               for (i = 0; i < row_width; i += 4)
+               {
+                  int a = *sp & 0xc0;
+                  int b = *sp & 0x30;
+                  int c = *sp & 0x0c;
+                  int d = *sp & 0x03;
+
+                  *sp = (png_byte)(
+                      ((((int)gamma_table[a|(a>>2)|(a>>4)|(a>>6)])   ) & 0xc0)|
+                      ((((int)gamma_table[(b<<2)|b|(b>>2)|(b>>4)])>>2) & 0x30)|
+                      ((((int)gamma_table[(c<<4)|(c<<2)|c|(c>>2)])>>4) & 0x0c)|
+                      ((((int)gamma_table[(d<<6)|(d<<4)|(d<<2)|d])>>6) ));
+                  sp++;
+               }
+            }
+
+            if (row_info->bit_depth == 4)
+            {
+               sp = row;
+               for (i = 0; i < row_width; i += 2)
+               {
+                  int msb = *sp & 0xf0;
+                  int lsb = *sp & 0x0f;
+
+                  *sp = (png_byte)((((int)gamma_table[msb | (msb >> 4)]) & 0xf0)
+                      | (((int)gamma_table[(lsb << 4) | lsb]) >> 4));
+                  sp++;
+               }
+            }
+
+            else if (row_info->bit_depth == 8)
+            {
+               sp = row;
+               for (i = 0; i < row_width; i++)
+               {
+                  *sp = gamma_table[*sp];
+                  sp++;
+               }
+            }
+
+            else if (row_info->bit_depth == 16)
+            {
+               sp = row;
+               for (i = 0; i < row_width; i++)
+               {
+                  png_uint_16 v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
+                  *sp = (png_byte)((v >> 8) & 0xff);
+                  *(sp + 1) = (png_byte)(v & 0xff);
+                  sp += 2;
+               }
+            }
+            break;
+         }
+      }
+   }
+}
+#endif
+
+#ifdef PNG_READ_EXPAND_SUPPORTED
+/* Expands a palette row to an RGB or RGBA row depending
+ * upon whether you supply trans and num_trans.
+ */
+void /* PRIVATE */
+png_do_expand_palette(png_row_infop row_info, png_bytep row,
+   png_colorp palette, png_bytep trans, int num_trans)
+{
+   int shift, value;
+   png_bytep sp, dp;
+   png_uint_32 i;
+   png_uint_32 row_width=row_info->width;
+
+   png_debug(1, "in png_do_expand_palette");
+
+   if (
+#ifdef PNG_USELESS_TESTS_SUPPORTED
+       row != NULL && row_info != NULL &&
+#endif
+       row_info->color_type == PNG_COLOR_TYPE_PALETTE)
+   {
+      if (row_info->bit_depth < 8)
+      {
+         switch (row_info->bit_depth)
+         {
+            case 1:
+            {
+               sp = row + (png_size_t)((row_width - 1) >> 3);
+               dp = row + (png_size_t)row_width - 1;
+               shift = 7 - (int)((row_width + 7) & 0x07);
+               for (i = 0; i < row_width; i++)
+               {
+                  if ((*sp >> shift) & 0x01)
+                     *dp = 1;
+                  else
+                     *dp = 0;
+                  if (shift == 7)
+                  {
+                     shift = 0;
+                     sp--;
+                  }
+                  else
+                     shift++;
+
+                  dp--;
+               }
+               break;
+            }
+
+            case 2:
+            {
+               sp = row + (png_size_t)((row_width - 1) >> 2);
+               dp = row + (png_size_t)row_width - 1;
+               shift = (int)((3 - ((row_width + 3) & 0x03)) << 1);
+               for (i = 0; i < row_width; i++)
+               {
+                  value = (*sp >> shift) & 0x03;
+                  *dp = (png_byte)value;
+                  if (shift == 6)
+                  {
+                     shift = 0;
+                     sp--;
+                  }
+                  else
+                     shift += 2;
+
+                  dp--;
+               }
+               break;
+            }
+
+            case 4:
+            {
+               sp = row + (png_size_t)((row_width - 1) >> 1);
+               dp = row + (png_size_t)row_width - 1;
+               shift = (int)((row_width & 0x01) << 2);
+               for (i = 0; i < row_width; i++)
+               {
+                  value = (*sp >> shift) & 0x0f;
+                  *dp = (png_byte)value;
+                  if (shift == 4)
+                  {
+                     shift = 0;
+                     sp--;
+                  }
+                  else
+                     shift += 4;
+
+                  dp--;
+               }
+               break;
+            }
+         }
+         row_info->bit_depth = 8;
+         row_info->pixel_depth = 8;
+         row_info->rowbytes = row_width;
+      }
+      switch (row_info->bit_depth)
+      {
+         case 8:
+         {
+            if (trans != NULL)
+            {
+               sp = row + (png_size_t)row_width - 1;
+               dp = row + (png_size_t)(row_width << 2) - 1;
+
+               for (i = 0; i < row_width; i++)
+               {
+                  if ((int)(*sp) >= num_trans)
+                     *dp-- = 0xff;
+                  else
+                     *dp-- = trans[*sp];
+                  *dp-- = palette[*sp].blue;
+                  *dp-- = palette[*sp].green;
+                  *dp-- = palette[*sp].red;
+                  sp--;
+               }
+               row_info->bit_depth = 8;
+               row_info->pixel_depth = 32;
+               row_info->rowbytes = row_width * 4;
+               row_info->color_type = 6;
+               row_info->channels = 4;
+            }
+            else
+            {
+               sp = row + (png_size_t)row_width - 1;
+               dp = row + (png_size_t)(row_width * 3) - 1;
+
+               for (i = 0; i < row_width; i++)
+               {
+                  *dp-- = palette[*sp].blue;
+                  *dp-- = palette[*sp].green;
+                  *dp-- = palette[*sp].red;
+                  sp--;
+               }
+
+               row_info->bit_depth = 8;
+               row_info->pixel_depth = 24;
+               row_info->rowbytes = row_width * 3;
+               row_info->color_type = 2;
+               row_info->channels = 3;
+            }
+            break;
+         }
+      }
+   }
+}
+
+/* If the bit depth < 8, it is expanded to 8.  Also, if the already
+ * expanded transparency value is supplied, an alpha channel is built.
+ */
+void /* PRIVATE */
+png_do_expand(png_row_infop row_info, png_bytep row,
+   png_color_16p trans_value)
+{
+   int shift, value;
+   png_bytep sp, dp;
+   png_uint_32 i;
+   png_uint_32 row_width=row_info->width;
+
+   png_debug(1, "in png_do_expand");
+
+#ifdef PNG_USELESS_TESTS_SUPPORTED
+   if (row != NULL && row_info != NULL)
+#endif
+   {
+      if (row_info->color_type == PNG_COLOR_TYPE_GRAY)
+      {
+         png_uint_16 gray = (png_uint_16)(trans_value ? trans_value->gray : 0);
+
+         if (row_info->bit_depth < 8)
+         {
+            switch (row_info->bit_depth)
+            {
+               case 1:
+               {
+                  gray = (png_uint_16)((gray&0x01)*0xff);
+                  sp = row + (png_size_t)((row_width - 1) >> 3);
+                  dp = row + (png_size_t)row_width - 1;
+                  shift = 7 - (int)((row_width + 7) & 0x07);
+                  for (i = 0; i < row_width; i++)
+                  {
+                     if ((*sp >> shift) & 0x01)
+                        *dp = 0xff;
+                     else
+                        *dp = 0;
+                     if (shift == 7)
+                     {
+                        shift = 0;
+                        sp--;
+                     }
+                     else
+                        shift++;
+
+                     dp--;
+                  }
+                  break;
+               }
+
+               case 2:
+               {
+                  gray = (png_uint_16)((gray&0x03)*0x55);
+                  sp = row + (png_size_t)((row_width - 1) >> 2);
+                  dp = row + (png_size_t)row_width - 1;
+                  shift = (int)((3 - ((row_width + 3) & 0x03)) << 1);
+                  for (i = 0; i < row_width; i++)
+                  {
+                     value = (*sp >> shift) & 0x03;
+                     *dp = (png_byte)(value | (value << 2) | (value << 4) |
+                        (value << 6));
+                     if (shift == 6)
+                     {
+                        shift = 0;
+                        sp--;
+                     }
+                     else
+                        shift += 2;
+
+                     dp--;
+                  }
+                  break;
+               }
+
+               case 4:
+               {
+                  gray = (png_uint_16)((gray&0x0f)*0x11);
+                  sp = row + (png_size_t)((row_width - 1) >> 1);
+                  dp = row + (png_size_t)row_width - 1;
+                  shift = (int)((1 - ((row_width + 1) & 0x01)) << 2);
+                  for (i = 0; i < row_width; i++)
+                  {
+                     value = (*sp >> shift) & 0x0f;
+                     *dp = (png_byte)(value | (value << 4));
+                     if (shift == 4)
+                     {
+                        shift = 0;
+                        sp--;
+                     }
+                     else
+                        shift = 4;
+
+                     dp--;
+                  }
+                  break;
+               }
+            }
+
+            row_info->bit_depth = 8;
+            row_info->pixel_depth = 8;
+            row_info->rowbytes = row_width;
+         }
+
+         if (trans_value != NULL)
+         {
+            if (row_info->bit_depth == 8)
+            {
+               gray = gray & 0xff;
+               sp = row + (png_size_t)row_width - 1;
+               dp = row + (png_size_t)(row_width << 1) - 1;
+               for (i = 0; i < row_width; i++)
+               {
+                  if (*sp == gray)
+                     *dp-- = 0;
+                  else
+                     *dp-- = 0xff;
+                  *dp-- = *sp--;
+               }
+            }
+
+            else if (row_info->bit_depth == 16)
+            {
+               png_byte gray_high = (gray >> 8) & 0xff;
+               png_byte gray_low = gray & 0xff;
+               sp = row + row_info->rowbytes - 1;
+               dp = row + (row_info->rowbytes << 1) - 1;
+               for (i = 0; i < row_width; i++)
+               {
+                  if (*(sp - 1) == gray_high && *(sp) == gray_low)
+                  {
+                     *dp-- = 0;
+                     *dp-- = 0;
+                  }
+                  else
+                  {
+                     *dp-- = 0xff;
+                     *dp-- = 0xff;
+                  }
+                  *dp-- = *sp--;
+                  *dp-- = *sp--;
+               }
+            }
+
+            row_info->color_type = PNG_COLOR_TYPE_GRAY_ALPHA;
+            row_info->channels = 2;
+            row_info->pixel_depth = (png_byte)(row_info->bit_depth << 1);
+            row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth,
+               row_width);
+         }
+      }
+      else if (row_info->color_type == PNG_COLOR_TYPE_RGB && trans_value)
+      {
+         if (row_info->bit_depth == 8)
+         {
+            png_byte red = trans_value->red & 0xff;
+            png_byte green = trans_value->green & 0xff;
+            png_byte blue = trans_value->blue & 0xff;
+            sp = row + (png_size_t)row_info->rowbytes - 1;
+            dp = row + (png_size_t)(row_width << 2) - 1;
+            for (i = 0; i < row_width; i++)
+            {
+               if (*(sp - 2) == red && *(sp - 1) == green && *(sp) == blue)
+                  *dp-- = 0;
+               else
+                  *dp-- = 0xff;
+               *dp-- = *sp--;
+               *dp-- = *sp--;
+               *dp-- = *sp--;
+            }
+         }
+         else if (row_info->bit_depth == 16)
+         {
+            png_byte red_high = (trans_value->red >> 8) & 0xff;
+            png_byte green_high = (trans_value->green >> 8) & 0xff;
+            png_byte blue_high = (trans_value->blue >> 8) & 0xff;
+            png_byte red_low = trans_value->red & 0xff;
+            png_byte green_low = trans_value->green & 0xff;
+            png_byte blue_low = trans_value->blue & 0xff;
+            sp = row + row_info->rowbytes - 1;
+            dp = row + (png_size_t)(row_width << 3) - 1;
+            for (i = 0; i < row_width; i++)
+            {
+               if (*(sp - 5) == red_high &&
+                  *(sp - 4) == red_low &&
+                  *(sp - 3) == green_high &&
+                  *(sp - 2) == green_low &&
+                  *(sp - 1) == blue_high &&
+                  *(sp    ) == blue_low)
+               {
+                  *dp-- = 0;
+                  *dp-- = 0;
+               }
+               else
+               {
+                  *dp-- = 0xff;
+                  *dp-- = 0xff;
+               }
+               *dp-- = *sp--;
+               *dp-- = *sp--;
+               *dp-- = *sp--;
+               *dp-- = *sp--;
+               *dp-- = *sp--;
+               *dp-- = *sp--;
+            }
+         }
+         row_info->color_type = PNG_COLOR_TYPE_RGB_ALPHA;
+         row_info->channels = 4;
+         row_info->pixel_depth = (png_byte)(row_info->bit_depth << 2);
+         row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width);
+      }
+   }
+}
+#endif
+
+#ifdef PNG_READ_DITHER_SUPPORTED
+void /* PRIVATE */
+png_do_dither(png_row_infop row_info, png_bytep row,
+    png_bytep palette_lookup, png_bytep dither_lookup)
+{
+   png_bytep sp, dp;
+   png_uint_32 i;
+   png_uint_32 row_width=row_info->width;
+
+   png_debug(1, "in png_do_dither");
+
+#ifdef PNG_USELESS_TESTS_SUPPORTED
+   if (row != NULL && row_info != NULL)
+#endif
+   {
+      if (row_info->color_type == PNG_COLOR_TYPE_RGB &&
+         palette_lookup && row_info->bit_depth == 8)
+      {
+         int r, g, b, p;
+         sp = row;
+         dp = row;
+         for (i = 0; i < row_width; i++)
+         {
+            r = *sp++;
+            g = *sp++;
+            b = *sp++;
+
+            /* This looks real messy, but the compiler will reduce
+             * it down to a reasonable formula.  For example, with
+             * 5 bits per color, we get:
+             * p = (((r >> 3) & 0x1f) << 10) |
+             *    (((g >> 3) & 0x1f) << 5) |
+             *    ((b >> 3) & 0x1f);
+             */
+            p = (((r >> (8 - PNG_DITHER_RED_BITS)) &
+               ((1 << PNG_DITHER_RED_BITS) - 1)) <<
+               (PNG_DITHER_GREEN_BITS + PNG_DITHER_BLUE_BITS)) |
+               (((g >> (8 - PNG_DITHER_GREEN_BITS)) &
+               ((1 << PNG_DITHER_GREEN_BITS) - 1)) <<
+               (PNG_DITHER_BLUE_BITS)) |
+               ((b >> (8 - PNG_DITHER_BLUE_BITS)) &
+               ((1 << PNG_DITHER_BLUE_BITS) - 1));
+
+            *dp++ = palette_lookup[p];
+         }
+         row_info->color_type = PNG_COLOR_TYPE_PALETTE;
+         row_info->channels = 1;
+         row_info->pixel_depth = row_info->bit_depth;
+         row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width);
+      }
+      else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA &&
+         palette_lookup != NULL && row_info->bit_depth == 8)
+      {
+         int r, g, b, p;
+         sp = row;
+         dp = row;
+         for (i = 0; i < row_width; i++)
+         {
+            r = *sp++;
+            g = *sp++;
+            b = *sp++;
+            sp++;
+
+            p = (((r >> (8 - PNG_DITHER_RED_BITS)) &
+               ((1 << PNG_DITHER_RED_BITS) - 1)) <<
+               (PNG_DITHER_GREEN_BITS + PNG_DITHER_BLUE_BITS)) |
+               (((g >> (8 - PNG_DITHER_GREEN_BITS)) &
+               ((1 << PNG_DITHER_GREEN_BITS) - 1)) <<
+               (PNG_DITHER_BLUE_BITS)) |
+               ((b >> (8 - PNG_DITHER_BLUE_BITS)) &
+               ((1 << PNG_DITHER_BLUE_BITS) - 1));
+
+            *dp++ = palette_lookup[p];
+         }
+         row_info->color_type = PNG_COLOR_TYPE_PALETTE;
+         row_info->channels = 1;
+         row_info->pixel_depth = row_info->bit_depth;
+         row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width);
+      }
+      else if (row_info->color_type == PNG_COLOR_TYPE_PALETTE &&
+         dither_lookup && row_info->bit_depth == 8)
+      {
+         sp = row;
+         for (i = 0; i < row_width; i++, sp++)
+         {
+            *sp = dither_lookup[*sp];
+         }
+      }
+   }
+}
+#endif
+
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+#ifdef PNG_READ_GAMMA_SUPPORTED
+static PNG_CONST int png_gamma_shift[] =
+   {0x10, 0x21, 0x42, 0x84, 0x110, 0x248, 0x550, 0xff0, 0x00};
+
+/* We build the 8- or 16-bit gamma tables here.  Note that for 16-bit
+ * tables, we don't make a full table if we are reducing to 8-bit in
+ * the future.  Note also how the gamma_16 tables are segmented so that
+ * we don't need to allocate > 64K chunks for a full 16-bit table.
+ *
+ * See the PNG extensions document for an integer algorithm for creating
+ * the gamma tables.  Maybe we will implement that here someday.
+ *
+ * We should only reach this point if
+ *
+ *      the file_gamma is known (i.e., the gAMA or sRGB chunk is present,
+ *      or the application has provided a file_gamma)
+ *
+ *   AND
+ *      {
+ *         the screen_gamma is known
+ *      OR
+ *
+ *         RGB_to_gray transformation is being performed
+ *      }
+ *
+ *   AND
+ *      {
+ *         the screen_gamma is different from the reciprocal of the
+ *         file_gamma by more than the specified threshold
+ *
+ *      OR
+ *
+ *         a background color has been specified and the file_gamma
+ *         and screen_gamma are not 1.0, within the specified threshold.
+ *      }
+ */
+
+void /* PRIVATE */
+png_build_gamma_table(png_structp png_ptr)
+{
+  png_debug(1, "in png_build_gamma_table");
+
+  if (png_ptr->bit_depth <= 8)
+  {
+     int i;
+     double g;
+
+     if (png_ptr->screen_gamma > .000001)
+        g = 1.0 / (png_ptr->gamma * png_ptr->screen_gamma);
+
+     else
+        g = 1.0;
+
+     png_ptr->gamma_table = (png_bytep)png_malloc(png_ptr,
+        (png_uint_32)256);
+
+     for (i = 0; i < 256; i++)
+     {
+        png_ptr->gamma_table[i] = (png_byte)(pow((double)i / 255.0,
+           g) * 255.0 + .5);
+     }
+
+#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
+   defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
+     if (png_ptr->transformations & ((PNG_BACKGROUND) | PNG_RGB_TO_GRAY))
+     {
+
+        g = 1.0 / (png_ptr->gamma);
+
+        png_ptr->gamma_to_1 = (png_bytep)png_malloc(png_ptr,
+           (png_uint_32)256);
+
+        for (i = 0; i < 256; i++)
+        {
+           png_ptr->gamma_to_1[i] = (png_byte)(pow((double)i / 255.0,
+              g) * 255.0 + .5);
+        }
+
+
+        png_ptr->gamma_from_1 = (png_bytep)png_malloc(png_ptr,
+           (png_uint_32)256);
+
+        if (png_ptr->screen_gamma > 0.000001)
+           g = 1.0 / png_ptr->screen_gamma;
+
+        else
+           g = png_ptr->gamma;   /* Probably doing rgb_to_gray */
+
+        for (i = 0; i < 256; i++)
+        {
+           png_ptr->gamma_from_1[i] = (png_byte)(pow((double)i / 255.0,
+              g) * 255.0 + .5);
+
+        }
+     }
+#endif /* PNG_READ_BACKGROUND_SUPPORTED || PNG_RGB_TO_GRAY_SUPPORTED */
+  }
+  else
+  {
+     double g;
+     int i, j, shift, num;
+     int sig_bit;
+     png_uint_32 ig;
+
+     if (png_ptr->color_type & PNG_COLOR_MASK_COLOR)
+     {
+        sig_bit = (int)png_ptr->sig_bit.red;
+
+        if ((int)png_ptr->sig_bit.green > sig_bit)
+           sig_bit = png_ptr->sig_bit.green;
+
+        if ((int)png_ptr->sig_bit.blue > sig_bit)
+           sig_bit = png_ptr->sig_bit.blue;
+     }
+     else
+     {
+        sig_bit = (int)png_ptr->sig_bit.gray;
+     }
+
+     if (sig_bit > 0)
+        shift = 16 - sig_bit;
+
+     else
+        shift = 0;
+
+     if (png_ptr->transformations & PNG_16_TO_8)
+     {
+        if (shift < (16 - PNG_MAX_GAMMA_8))
+           shift = (16 - PNG_MAX_GAMMA_8);
+     }
+
+     if (shift > 8)
+        shift = 8;
+
+     if (shift < 0)
+        shift = 0;
+
+     png_ptr->gamma_shift = (png_byte)shift;
+
+     num = (1 << (8 - shift));
+
+     if (png_ptr->screen_gamma > .000001)
+        g = 1.0 / (png_ptr->gamma * png_ptr->screen_gamma);
+     else
+        g = 1.0;
+
+     png_ptr->gamma_16_table = (png_uint_16pp)png_calloc(png_ptr,
+        (png_uint_32)(num * png_sizeof(png_uint_16p)));
+
+     if (png_ptr->transformations & (PNG_16_TO_8 | PNG_BACKGROUND))
+     {
+        double fin, fout;
+        png_uint_32 last, max;
+
+        for (i = 0; i < num; i++)
+        {
+           png_ptr->gamma_16_table[i] = (png_uint_16p)png_malloc(png_ptr,
+              (png_uint_32)(256 * png_sizeof(png_uint_16)));
+        }
+
+        g = 1.0 / g;
+        last = 0;
+        for (i = 0; i < 256; i++)
+        {
+           fout = ((double)i + 0.5) / 256.0;
+           fin = pow(fout, g);
+           max = (png_uint_32)(fin * (double)((png_uint_32)num << 8));
+           while (last <= max)
+           {
+              png_ptr->gamma_16_table[(int)(last & (0xff >> shift))]
+                 [(int)(last >> (8 - shift))] = (png_uint_16)(
+                 (png_uint_16)i | ((png_uint_16)i << 8));
+              last++;
+           }
+        }
+        while (last < ((png_uint_32)num << 8))
+        {
+           png_ptr->gamma_16_table[(int)(last & (0xff >> shift))]
+              [(int)(last >> (8 - shift))] = (png_uint_16)65535L;
+           last++;
+        }
+     }
+     else
+     {
+        for (i = 0; i < num; i++)
+        {
+           png_ptr->gamma_16_table[i] = (png_uint_16p)png_malloc(png_ptr,
+              (png_uint_32)(256 * png_sizeof(png_uint_16)));
+
+           ig = (((png_uint_32)i * (png_uint_32)png_gamma_shift[shift]) >> 4);
+
+           for (j = 0; j < 256; j++)
+           {
+              png_ptr->gamma_16_table[i][j] =
+                 (png_uint_16)(pow((double)(ig + ((png_uint_32)j << 8)) /
+                    65535.0, g) * 65535.0 + .5);
+           }
+        }
+     }
+
+#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
+   defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
+     if (png_ptr->transformations & (PNG_BACKGROUND | PNG_RGB_TO_GRAY))
+     {
+
+        g = 1.0 / (png_ptr->gamma);
+
+        png_ptr->gamma_16_to_1 = (png_uint_16pp)png_calloc(png_ptr,
+           (png_uint_32)(num * png_sizeof(png_uint_16p )));
+
+        for (i = 0; i < num; i++)
+        {
+           png_ptr->gamma_16_to_1[i] = (png_uint_16p)png_malloc(png_ptr,
+              (png_uint_32)(256 * png_sizeof(png_uint_16)));
+
+           ig = (((png_uint_32)i *
+              (png_uint_32)png_gamma_shift[shift]) >> 4);
+           for (j = 0; j < 256; j++)
+           {
+              png_ptr->gamma_16_to_1[i][j] =
+                 (png_uint_16)(pow((double)(ig + ((png_uint_32)j << 8)) /
+                    65535.0, g) * 65535.0 + .5);
+           }
+        }
+
+        if (png_ptr->screen_gamma > 0.000001)
+           g = 1.0 / png_ptr->screen_gamma;
+
+        else
+           g = png_ptr->gamma;   /* Probably doing rgb_to_gray */
+
+        png_ptr->gamma_16_from_1 = (png_uint_16pp)png_calloc(png_ptr,
+           (png_uint_32)(num * png_sizeof(png_uint_16p)));
+
+        for (i = 0; i < num; i++)
+        {
+           png_ptr->gamma_16_from_1[i] = (png_uint_16p)png_malloc(png_ptr,
+              (png_uint_32)(256 * png_sizeof(png_uint_16)));
+
+           ig = (((png_uint_32)i *
+              (png_uint_32)png_gamma_shift[shift]) >> 4);
+
+           for (j = 0; j < 256; j++)
+           {
+              png_ptr->gamma_16_from_1[i][j] =
+                 (png_uint_16)(pow((double)(ig + ((png_uint_32)j << 8)) /
+                    65535.0, g) * 65535.0 + .5);
+           }
+        }
+     }
+#endif /* PNG_READ_BACKGROUND_SUPPORTED || PNG_RGB_TO_GRAY_SUPPORTED */
+  }
+}
+#endif
+/* To do: install integer version of png_build_gamma_table here */
+#endif
+
+#ifdef PNG_MNG_FEATURES_SUPPORTED
+/* Undoes intrapixel differencing  */
+void /* PRIVATE */
+png_do_read_intrapixel(png_row_infop row_info, png_bytep row)
+{
+   png_debug(1, "in png_do_read_intrapixel");
+
+   if (
+#ifdef PNG_USELESS_TESTS_SUPPORTED
+       row != NULL && row_info != NULL &&
+#endif
+       (row_info->color_type & PNG_COLOR_MASK_COLOR))
+   {
+      int bytes_per_pixel;
+      png_uint_32 row_width = row_info->width;
+      if (row_info->bit_depth == 8)
+      {
+         png_bytep rp;
+         png_uint_32 i;
+
+         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
+            bytes_per_pixel = 3;
+
+         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+            bytes_per_pixel = 4;
+
+         else
+            return;
+
+         for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
+         {
+            *(rp) = (png_byte)((256 + *rp + *(rp+1))&0xff);
+            *(rp+2) = (png_byte)((256 + *(rp+2) + *(rp+1))&0xff);
+         }
+      }
+      else if (row_info->bit_depth == 16)
+      {
+         png_bytep rp;
+         png_uint_32 i;
+
+         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
+            bytes_per_pixel = 6;
+
+         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+            bytes_per_pixel = 8;
+
+         else
+            return;
+
+         for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
+         {
+            png_uint_32 s0   = (*(rp    ) << 8) | *(rp + 1);
+            png_uint_32 s1   = (*(rp + 2) << 8) | *(rp + 3);
+            png_uint_32 s2   = (*(rp + 4) << 8) | *(rp + 5);
+            png_uint_32 red  = (png_uint_32)((s0 + s1 + 65536L) & 0xffffL);
+            png_uint_32 blue = (png_uint_32)((s2 + s1 + 65536L) & 0xffffL);
+            *(rp  ) = (png_byte)((red >> 8) & 0xff);
+            *(rp+1) = (png_byte)(red & 0xff);
+            *(rp+4) = (png_byte)((blue >> 8) & 0xff);
+            *(rp+5) = (png_byte)(blue & 0xff);
+         }
+      }
+   }
+}
+#endif /* PNG_MNG_FEATURES_SUPPORTED */
+#endif /* PNG_READ_SUPPORTED */
diff --git a/src/libpng/pngrutil.c b/src/libpng/pngrutil.c
new file mode 100644
index 0000000..45e7ddd
--- /dev/null
+++ b/src/libpng/pngrutil.c
@@ -0,0 +1,3390 @@
+
+/* pngrutil.c - utilities to read a PNG file
+ *
+ * Last changed in libpng 1.2.45 [July 7, 2011]
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
+ * This file contains routines that are only called from within
+ * libpng itself during the course of reading an image.
+ */
+
+#define PNG_INTERNAL
+#define PNG_NO_PEDANTIC_WARNINGS
+#include "png.h"
+#ifdef PNG_READ_SUPPORTED
+
+#if defined(_WIN32_WCE) && (_WIN32_WCE<0x500)
+#  define WIN32_WCE_OLD
+#endif
+
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+#  ifdef WIN32_WCE_OLD
+/* The strtod() function is not supported on WindowsCE */
+__inline double png_strtod(png_structp png_ptr, PNG_CONST char *nptr,
+    char **endptr)
+{
+   double result = 0;
+   int len;
+   wchar_t *str, *end;
+
+   len = MultiByteToWideChar(CP_ACP, 0, nptr, -1, NULL, 0);
+   str = (wchar_t *)png_malloc(png_ptr, len * png_sizeof(wchar_t));
+   if ( NULL != str )
+   {
+      MultiByteToWideChar(CP_ACP, 0, nptr, -1, str, len);
+      result = wcstod(str, &end);
+      len = WideCharToMultiByte(CP_ACP, 0, end, -1, NULL, 0, NULL, NULL);
+      *endptr = (char *)nptr + (png_strlen(nptr) - len + 1);
+      png_free(png_ptr, str);
+   }
+   return result;
+}
+#  else
+#    define png_strtod(p,a,b) strtod(a,b)
+#  endif
+#endif
+
+png_uint_32 PNGAPI
+png_get_uint_31(png_structp png_ptr, png_bytep buf)
+{
+#ifdef PNG_READ_BIG_ENDIAN_SUPPORTED
+   png_uint_32 i = png_get_uint_32(buf);
+#else
+   /* Avoid an extra function call by inlining the result. */
+   png_uint_32 i = ((png_uint_32)(*buf) << 24) +
+      ((png_uint_32)(*(buf + 1)) << 16) +
+      ((png_uint_32)(*(buf + 2)) << 8) +
+      (png_uint_32)(*(buf + 3));
+#endif
+   if (i > PNG_UINT_31_MAX)
+     png_error(png_ptr, "PNG unsigned integer out of range.");
+   return (i);
+}
+#ifndef PNG_READ_BIG_ENDIAN_SUPPORTED
+/* Grab an unsigned 32-bit integer from a buffer in big-endian format. */
+png_uint_32 PNGAPI
+png_get_uint_32(png_bytep buf)
+{
+   png_uint_32 i = ((png_uint_32)(*buf) << 24) +
+      ((png_uint_32)(*(buf + 1)) << 16) +
+      ((png_uint_32)(*(buf + 2)) << 8) +
+      (png_uint_32)(*(buf + 3));
+
+   return (i);
+}
+
+/* Grab a signed 32-bit integer from a buffer in big-endian format.  The
+ * data is stored in the PNG file in two's complement format, and it is
+ * assumed that the machine format for signed integers is the same.
+ */
+png_int_32 PNGAPI
+png_get_int_32(png_bytep buf)
+{
+   png_int_32 i = ((png_int_32)(*buf) << 24) +
+      ((png_int_32)(*(buf + 1)) << 16) +
+      ((png_int_32)(*(buf + 2)) << 8) +
+      (png_int_32)(*(buf + 3));
+
+   return (i);
+}
+
+/* Grab an unsigned 16-bit integer from a buffer in big-endian format. */
+png_uint_16 PNGAPI
+png_get_uint_16(png_bytep buf)
+{
+   png_uint_16 i = (png_uint_16)(((png_uint_16)(*buf) << 8) +
+      (png_uint_16)(*(buf + 1)));
+
+   return (i);
+}
+#endif /* PNG_READ_BIG_ENDIAN_SUPPORTED */
+
+/* Read the chunk header (length + type name).
+ * Put the type name into png_ptr->chunk_name, and return the length.
+ */
+png_uint_32 /* PRIVATE */
+png_read_chunk_header(png_structp png_ptr)
+{
+   png_byte buf[8];
+   png_uint_32 length;
+
+   /* Read the length and the chunk name */
+   png_read_data(png_ptr, buf, 8);
+   length = png_get_uint_31(png_ptr, buf);
+
+   /* Put the chunk name into png_ptr->chunk_name */
+   png_memcpy(png_ptr->chunk_name, buf + 4, 4);
+
+   png_debug2(0, "Reading %s chunk, length = %lu",
+      png_ptr->chunk_name, length);
+
+   /* Reset the crc and run it over the chunk name */
+   png_reset_crc(png_ptr);
+   png_calculate_crc(png_ptr, png_ptr->chunk_name, 4);
+
+   /* Check to see if chunk name is valid */
+   png_check_chunk_name(png_ptr, png_ptr->chunk_name);
+
+   return length;
+}
+
+/* Read data, and (optionally) run it through the CRC. */
+void /* PRIVATE */
+png_crc_read(png_structp png_ptr, png_bytep buf, png_size_t length)
+{
+   if (png_ptr == NULL)
+      return;
+   png_read_data(png_ptr, buf, length);
+   png_calculate_crc(png_ptr, buf, length);
+}
+
+/* Optionally skip data and then check the CRC.  Depending on whether we
+ * are reading a ancillary or critical chunk, and how the program has set
+ * things up, we may calculate the CRC on the data and print a message.
+ * Returns '1' if there was a CRC error, '0' otherwise.
+ */
+int /* PRIVATE */
+png_crc_finish(png_structp png_ptr, png_uint_32 skip)
+{
+   png_size_t i;
+   png_size_t istop = png_ptr->zbuf_size;
+
+   for (i = (png_size_t)skip; i > istop; i -= istop)
+   {
+      png_crc_read(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size);
+   }
+   if (i)
+   {
+      png_crc_read(png_ptr, png_ptr->zbuf, i);
+   }
+
+   if (png_crc_error(png_ptr))
+   {
+      if (((png_ptr->chunk_name[0] & 0x20) &&                /* Ancillary */
+          !(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN)) ||
+          (!(png_ptr->chunk_name[0] & 0x20) &&             /* Critical  */
+          (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_USE)))
+      {
+         png_chunk_warning(png_ptr, "CRC error");
+      }
+      else
+      {
+         png_chunk_error(png_ptr, "CRC error");
+      }
+      return (1);
+   }
+
+   return (0);
+}
+
+/* Compare the CRC stored in the PNG file with that calculated by libpng from
+ * the data it has read thus far.
+ */
+int /* PRIVATE */
+png_crc_error(png_structp png_ptr)
+{
+   png_byte crc_bytes[4];
+   png_uint_32 crc;
+   int need_crc = 1;
+
+   if (png_ptr->chunk_name[0] & 0x20)                     /* ancillary */
+   {
+      if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) ==
+          (PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN))
+         need_crc = 0;
+   }
+   else                                                    /* critical */
+   {
+      if (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE)
+         need_crc = 0;
+   }
+
+   png_read_data(png_ptr, crc_bytes, 4);
+
+   if (need_crc)
+   {
+      crc = png_get_uint_32(crc_bytes);
+      return ((int)(crc != png_ptr->crc));
+   }
+   else
+      return (0);
+}
+
+#if defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_READ_iTXt_SUPPORTED) || \
+    defined(PNG_READ_iCCP_SUPPORTED)
+static png_size_t
+png_inflate(png_structp png_ptr, const png_byte *data, png_size_t size,
+        png_bytep output, png_size_t output_size)
+{
+   png_size_t count = 0;
+
+   png_ptr->zstream.next_in = (png_bytep)data; /* const_cast: VALID */
+   png_ptr->zstream.avail_in = size;
+
+   while (1)
+   {
+      int ret, avail;
+
+      /* Reset the output buffer each time round - we empty it
+       * after every inflate call.
+       */
+      png_ptr->zstream.next_out = png_ptr->zbuf;
+      png_ptr->zstream.avail_out = png_ptr->zbuf_size;
+
+      ret = inflate(&png_ptr->zstream, Z_NO_FLUSH);
+      avail = png_ptr->zbuf_size - png_ptr->zstream.avail_out;
+
+      /* First copy/count any new output - but only if we didn't
+       * get an error code.
+       */
+      if ((ret == Z_OK || ret == Z_STREAM_END) && avail > 0)
+      {
+         if (output != 0 && output_size > count)
+         {
+            int copy = output_size - count;
+            if (avail < copy) copy = avail;
+            png_memcpy(output + count, png_ptr->zbuf, copy);
+         }
+         count += avail;
+      }
+
+      if (ret == Z_OK)
+         continue;
+
+      /* Termination conditions - always reset the zstream, it
+       * must be left in inflateInit state.
+       */
+      png_ptr->zstream.avail_in = 0;
+      inflateReset(&png_ptr->zstream);
+
+      if (ret == Z_STREAM_END)
+         return count; /* NOTE: may be zero. */
+
+      /* Now handle the error codes - the API always returns 0
+       * and the error message is dumped into the uncompressed
+       * buffer if available.
+       */
+      {
+         PNG_CONST char *msg;
+         if (png_ptr->zstream.msg != 0)
+            msg = png_ptr->zstream.msg;
+         else
+         {
+#if defined(PNG_STDIO_SUPPORTED) && !defined(_WIN32_WCE)
+            char umsg[52];
+
+            switch (ret)
+            {
+               case Z_BUF_ERROR:
+                  msg = "Buffer error in compressed datastream in %s chunk";
+                  break;
+               case Z_DATA_ERROR:
+                  msg = "Data error in compressed datastream in %s chunk";
+                  break;
+               default:
+                  msg = "Incomplete compressed datastream in %s chunk";
+                  break;
+            }
+
+            png_snprintf(umsg, sizeof umsg, msg, png_ptr->chunk_name);
+            msg = umsg;
+#else
+            msg = "Damaged compressed datastream in chunk other than IDAT";
+#endif
+         }
+
+         png_warning(png_ptr, msg);
+      }
+
+      /* 0 means an error - notice that this code simple ignores
+       * zero length compressed chunks as a result.
+       */
+      return 0;
+   }
+}
+
+/*
+ * Decompress trailing data in a chunk.  The assumption is that chunkdata
+ * points at an allocated area holding the contents of a chunk with a
+ * trailing compressed part.  What we get back is an allocated area
+ * holding the original prefix part and an uncompressed version of the
+ * trailing part (the malloc area passed in is freed).
+ */
+void /* PRIVATE */
+png_decompress_chunk(png_structp png_ptr, int comp_type,
+    png_size_t chunklength,
+    png_size_t prefix_size, png_size_t *newlength)
+{
+   /* The caller should guarantee this */
+   if (prefix_size > chunklength)
+   {
+      /* The recovery is to delete the chunk. */
+      png_warning(png_ptr, "invalid chunklength");
+      prefix_size = 0; /* To delete everything */
+   }
+
+   else if (comp_type == PNG_COMPRESSION_TYPE_BASE)
+   {
+      png_size_t expanded_size = png_inflate(png_ptr,
+                (png_bytep)(png_ptr->chunkdata + prefix_size),
+                chunklength - prefix_size,
+                0/*output*/, 0/*output size*/);
+
+      /* Now check the limits on this chunk - if the limit fails the
+       * compressed data will be removed, the prefix will remain.
+       */
+#ifdef PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED
+      if (png_ptr->user_chunk_malloc_max &&
+          (prefix_size + expanded_size >= png_ptr->user_chunk_malloc_max - 1))
+#else
+#  ifdef PNG_USER_CHUNK_MALLOC_MAX
+      if ((PNG_USER_CHUNK_MALLOC_MAX > 0) &&
+          prefix_size + expanded_size >= PNG_USER_CHUNK_MALLOC_MAX - 1)
+#  endif
+#endif
+         png_warning(png_ptr, "Exceeded size limit while expanding chunk");
+
+      /* If the size is zero either there was an error and a message
+       * has already been output (warning) or the size really is zero
+       * and we have nothing to do - the code will exit through the
+       * error case below.
+       */
+#if defined(PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED) || \
+    defined(PNG_USER_CHUNK_MALLOC_MAX)
+      else
+#endif
+      if (expanded_size > 0)
+      {
+         /* Success (maybe) - really uncompress the chunk. */
+         png_size_t new_size = 0;
+         png_charp text = png_malloc_warn(png_ptr,
+                        prefix_size + expanded_size + 1);
+
+         if (text != NULL)
+         {
+            png_memcpy(text, png_ptr->chunkdata, prefix_size);
+            new_size = png_inflate(png_ptr,
+                (png_bytep)(png_ptr->chunkdata + prefix_size),
+                chunklength - prefix_size,
+                (png_bytep)(text + prefix_size), expanded_size);
+            text[prefix_size + expanded_size] = 0; /* just in case */
+
+            if (new_size == expanded_size)
+            {
+               png_free(png_ptr, png_ptr->chunkdata);
+               png_ptr->chunkdata = text;
+               *newlength = prefix_size + expanded_size;
+               return; /* The success return! */
+            }
+
+            png_warning(png_ptr, "png_inflate logic error");
+            png_free(png_ptr, text);
+         }
+         else
+          png_warning(png_ptr, "Not enough memory to decompress chunk.");
+      }
+   }
+
+   else /* if (comp_type != PNG_COMPRESSION_TYPE_BASE) */
+   {
+#if defined(PNG_STDIO_SUPPORTED) && !defined(_WIN32_WCE)
+      char umsg[50];
+
+      png_snprintf(umsg, sizeof umsg, "Unknown zTXt compression type %d",
+          comp_type);
+      png_warning(png_ptr, umsg);
+#else
+      png_warning(png_ptr, "Unknown zTXt compression type");
+#endif
+
+      /* The recovery is to simply drop the data. */
+   }
+
+   /* Generic error return - leave the prefix, delete the compressed
+    * data, reallocate the chunkdata to remove the potentially large
+    * amount of compressed data.
+    */
+   {
+      png_charp text = png_malloc_warn(png_ptr, prefix_size + 1);
+      if (text != NULL)
+      {
+         if (prefix_size > 0)
+            png_memcpy(text, png_ptr->chunkdata, prefix_size);
+         png_free(png_ptr, png_ptr->chunkdata);
+         png_ptr->chunkdata = text;
+
+         /* This is an extra zero in the 'uncompressed' part. */
+         *(png_ptr->chunkdata + prefix_size) = 0x00;
+      }
+      /* Ignore a malloc error here - it is safe. */
+   }
+
+   *newlength = prefix_size;
+}
+#endif
+
+/* Read and check the IDHR chunk */
+void /* PRIVATE */
+png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+{
+   png_byte buf[13];
+   png_uint_32 width, height;
+   int bit_depth, color_type, compression_type, filter_type;
+   int interlace_type;
+
+   png_debug(1, "in png_handle_IHDR");
+
+   if (png_ptr->mode & PNG_HAVE_IHDR)
+      png_error(png_ptr, "Out of place IHDR");
+
+   /* Check the length */
+   if (length != 13)
+      png_error(png_ptr, "Invalid IHDR chunk");
+
+   png_ptr->mode |= PNG_HAVE_IHDR;
+
+   png_crc_read(png_ptr, buf, 13);
+   png_crc_finish(png_ptr, 0);
+
+   width = png_get_uint_31(png_ptr, buf);
+   height = png_get_uint_31(png_ptr, buf + 4);
+   bit_depth = buf[8];
+   color_type = buf[9];
+   compression_type = buf[10];
+   filter_type = buf[11];
+   interlace_type = buf[12];
+
+   /* Set internal variables */
+   png_ptr->width = width;
+   png_ptr->height = height;
+   png_ptr->bit_depth = (png_byte)bit_depth;
+   png_ptr->interlaced = (png_byte)interlace_type;
+   png_ptr->color_type = (png_byte)color_type;
+#ifdef PNG_MNG_FEATURES_SUPPORTED
+   png_ptr->filter_type = (png_byte)filter_type;
+#endif
+   png_ptr->compression_type = (png_byte)compression_type;
+
+   /* Find number of channels */
+   switch (png_ptr->color_type)
+   {
+      case PNG_COLOR_TYPE_GRAY:
+      case PNG_COLOR_TYPE_PALETTE:
+         png_ptr->channels = 1;
+         break;
+
+      case PNG_COLOR_TYPE_RGB:
+         png_ptr->channels = 3;
+         break;
+
+      case PNG_COLOR_TYPE_GRAY_ALPHA:
+         png_ptr->channels = 2;
+         break;
+
+      case PNG_COLOR_TYPE_RGB_ALPHA:
+         png_ptr->channels = 4;
+         break;
+   }
+
+   /* Set up other useful info */
+   png_ptr->pixel_depth = (png_byte)(png_ptr->bit_depth *
+   png_ptr->channels);
+   png_ptr->rowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->width);
+   png_debug1(3, "bit_depth = %d", png_ptr->bit_depth);
+   png_debug1(3, "channels = %d", png_ptr->channels);
+   png_debug1(3, "rowbytes = %lu", png_ptr->rowbytes);
+   png_set_IHDR(png_ptr, info_ptr, width, height, bit_depth,
+      color_type, interlace_type, compression_type, filter_type);
+}
+
+/* Read and check the palette */
+void /* PRIVATE */
+png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+{
+   png_color palette[PNG_MAX_PALETTE_LENGTH];
+   int num, i;
+#ifdef PNG_POINTER_INDEXING_SUPPORTED
+   png_colorp pal_ptr;
+#endif
+
+   png_debug(1, "in png_handle_PLTE");
+
+   if (!(png_ptr->mode & PNG_HAVE_IHDR))
+      png_error(png_ptr, "Missing IHDR before PLTE");
+
+   else if (png_ptr->mode & PNG_HAVE_IDAT)
+   {
+      png_warning(png_ptr, "Invalid PLTE after IDAT");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+
+   else if (png_ptr->mode & PNG_HAVE_PLTE)
+      png_error(png_ptr, "Duplicate PLTE chunk");
+
+   png_ptr->mode |= PNG_HAVE_PLTE;
+
+   if (!(png_ptr->color_type&PNG_COLOR_MASK_COLOR))
+   {
+      png_warning(png_ptr,
+        "Ignoring PLTE chunk in grayscale PNG");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+#ifndef PNG_READ_OPT_PLTE_SUPPORTED
+   if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE)
+   {
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+#endif
+
+   if (length > 3*PNG_MAX_PALETTE_LENGTH || length % 3)
+   {
+      if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE)
+      {
+         png_warning(png_ptr, "Invalid palette chunk");
+         png_crc_finish(png_ptr, length);
+         return;
+      }
+
+      else
+      {
+         png_error(png_ptr, "Invalid palette chunk");
+      }
+   }
+
+   num = (int)length / 3;
+
+#ifdef PNG_POINTER_INDEXING_SUPPORTED
+   for (i = 0, pal_ptr = palette; i < num; i++, pal_ptr++)
+   {
+      png_byte buf[3];
+
+      png_crc_read(png_ptr, buf, 3);
+      pal_ptr->red = buf[0];
+      pal_ptr->green = buf[1];
+      pal_ptr->blue = buf[2];
+   }
+#else
+   for (i = 0; i < num; i++)
+   {
+      png_byte buf[3];
+
+      png_crc_read(png_ptr, buf, 3);
+      /* Don't depend upon png_color being any order */
+      palette[i].red = buf[0];
+      palette[i].green = buf[1];
+      palette[i].blue = buf[2];
+   }
+#endif
+
+   /* If we actually NEED the PLTE chunk (ie for a paletted image), we do
+    * whatever the normal CRC configuration tells us.  However, if we
+    * have an RGB image, the PLTE can be considered ancillary, so
+    * we will act as though it is.
+    */
+#ifndef PNG_READ_OPT_PLTE_SUPPORTED
+   if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
+#endif
+   {
+      png_crc_finish(png_ptr, 0);
+   }
+#ifndef PNG_READ_OPT_PLTE_SUPPORTED
+   else if (png_crc_error(png_ptr))  /* Only if we have a CRC error */
+   {
+      /* If we don't want to use the data from an ancillary chunk,
+         we have two options: an error abort, or a warning and we
+         ignore the data in this chunk (which should be OK, since
+         it's considered ancillary for a RGB or RGBA image). */
+      if (!(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_USE))
+      {
+         if (png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN)
+         {
+            png_chunk_error(png_ptr, "CRC error");
+         }
+         else
+         {
+            png_chunk_warning(png_ptr, "CRC error");
+            return;
+         }
+      }
+      /* Otherwise, we (optionally) emit a warning and use the chunk. */
+      else if (!(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN))
+      {
+         png_chunk_warning(png_ptr, "CRC error");
+      }
+   }
+#endif
+
+   png_set_PLTE(png_ptr, info_ptr, palette, num);
+
+#ifdef PNG_READ_tRNS_SUPPORTED
+   if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
+   {
+      if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
+      {
+         if (png_ptr->num_trans > (png_uint_16)num)
+         {
+            png_warning(png_ptr, "Truncating incorrect tRNS chunk length");
+            png_ptr->num_trans = (png_uint_16)num;
+         }
+         if (info_ptr->num_trans > (png_uint_16)num)
+         {
+            png_warning(png_ptr, "Truncating incorrect info tRNS chunk length");
+            info_ptr->num_trans = (png_uint_16)num;
+         }
+      }
+   }
+#endif
+
+}
+
+void /* PRIVATE */
+png_handle_IEND(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+{
+   png_debug(1, "in png_handle_IEND");
+
+   if (!(png_ptr->mode & PNG_HAVE_IHDR) || !(png_ptr->mode & PNG_HAVE_IDAT))
+   {
+      png_error(png_ptr, "No image in file");
+   }
+
+   png_ptr->mode |= (PNG_AFTER_IDAT | PNG_HAVE_IEND);
+
+   if (length != 0)
+   {
+      png_warning(png_ptr, "Incorrect IEND chunk length");
+   }
+   png_crc_finish(png_ptr, length);
+
+   info_ptr = info_ptr; /* Quiet compiler warnings about unused info_ptr */
+}
+
+#ifdef PNG_READ_gAMA_SUPPORTED
+void /* PRIVATE */
+png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+{
+   png_fixed_point igamma;
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+   float file_gamma;
+#endif
+   png_byte buf[4];
+
+   png_debug(1, "in png_handle_gAMA");
+
+   if (!(png_ptr->mode & PNG_HAVE_IHDR))
+      png_error(png_ptr, "Missing IHDR before gAMA");
+   else if (png_ptr->mode & PNG_HAVE_IDAT)
+   {
+      png_warning(png_ptr, "Invalid gAMA after IDAT");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+   else if (png_ptr->mode & PNG_HAVE_PLTE)
+      /* Should be an error, but we can cope with it */
+      png_warning(png_ptr, "Out of place gAMA chunk");
+
+   if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
+#ifdef PNG_READ_sRGB_SUPPORTED
+      && !(info_ptr->valid & PNG_INFO_sRGB)
+#endif
+      )
+   {
+      png_warning(png_ptr, "Duplicate gAMA chunk");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+
+   if (length != 4)
+   {
+      png_warning(png_ptr, "Incorrect gAMA chunk length");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+
+   png_crc_read(png_ptr, buf, 4);
+   if (png_crc_finish(png_ptr, 0))
+      return;
+
+   igamma = (png_fixed_point)png_get_uint_32(buf);
+   /* Check for zero gamma */
+   if (igamma == 0)
+      {
+         png_warning(png_ptr,
+           "Ignoring gAMA chunk with gamma=0");
+         return;
+      }
+
+#ifdef PNG_READ_sRGB_SUPPORTED
+   if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB))
+      if (PNG_OUT_OF_RANGE(igamma, 45500L, 500))
+      {
+         png_warning(png_ptr,
+           "Ignoring incorrect gAMA value when sRGB is also present");
+#ifdef PNG_CONSOLE_IO_SUPPORTED
+         fprintf(stderr, "gamma = (%d/100000)", (int)igamma);
+#endif
+         return;
+      }
+#endif /* PNG_READ_sRGB_SUPPORTED */
+
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+   file_gamma = (float)igamma / (float)100000.0;
+#  ifdef PNG_READ_GAMMA_SUPPORTED
+     png_ptr->gamma = file_gamma;
+#  endif
+     png_set_gAMA(png_ptr, info_ptr, file_gamma);
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+   png_set_gAMA_fixed(png_ptr, info_ptr, igamma);
+#endif
+}
+#endif
+
+#ifdef PNG_READ_sBIT_SUPPORTED
+void /* PRIVATE */
+png_handle_sBIT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+{
+   png_size_t truelen;
+   png_byte buf[4];
+
+   png_debug(1, "in png_handle_sBIT");
+
+   buf[0] = buf[1] = buf[2] = buf[3] = 0;
+
+   if (!(png_ptr->mode & PNG_HAVE_IHDR))
+      png_error(png_ptr, "Missing IHDR before sBIT");
+   else if (png_ptr->mode & PNG_HAVE_IDAT)
+   {
+      png_warning(png_ptr, "Invalid sBIT after IDAT");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+   else if (png_ptr->mode & PNG_HAVE_PLTE)
+   {
+      /* Should be an error, but we can cope with it */
+      png_warning(png_ptr, "Out of place sBIT chunk");
+   }
+   if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT))
+   {
+      png_warning(png_ptr, "Duplicate sBIT chunk");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+
+   if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
+      truelen = 3;
+   else
+      truelen = (png_size_t)png_ptr->channels;
+
+   if (length != truelen || length > 4)
+   {
+      png_warning(png_ptr, "Incorrect sBIT chunk length");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+
+   png_crc_read(png_ptr, buf, truelen);
+   if (png_crc_finish(png_ptr, 0))
+      return;
+
+   if (png_ptr->color_type & PNG_COLOR_MASK_COLOR)
+   {
+      png_ptr->sig_bit.red = buf[0];
+      png_ptr->sig_bit.green = buf[1];
+      png_ptr->sig_bit.blue = buf[2];
+      png_ptr->sig_bit.alpha = buf[3];
+   }
+   else
+   {
+      png_ptr->sig_bit.gray = buf[0];
+      png_ptr->sig_bit.red = buf[0];
+      png_ptr->sig_bit.green = buf[0];
+      png_ptr->sig_bit.blue = buf[0];
+      png_ptr->sig_bit.alpha = buf[1];
+   }
+   png_set_sBIT(png_ptr, info_ptr, &(png_ptr->sig_bit));
+}
+#endif
+
+#ifdef PNG_READ_cHRM_SUPPORTED
+void /* PRIVATE */
+png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+{
+   png_byte buf[32];
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+   float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
+#endif
+   png_fixed_point int_x_white, int_y_white, int_x_red, int_y_red, int_x_green,
+      int_y_green, int_x_blue, int_y_blue;
+
+   png_uint_32 uint_x, uint_y;
+
+   png_debug(1, "in png_handle_cHRM");
+
+   if (!(png_ptr->mode & PNG_HAVE_IHDR))
+      png_error(png_ptr, "Missing IHDR before cHRM");
+   else if (png_ptr->mode & PNG_HAVE_IDAT)
+   {
+      png_warning(png_ptr, "Invalid cHRM after IDAT");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+   else if (png_ptr->mode & PNG_HAVE_PLTE)
+      /* Should be an error, but we can cope with it */
+      png_warning(png_ptr, "Missing PLTE before cHRM");
+
+   if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM)
+#ifdef PNG_READ_sRGB_SUPPORTED
+      && !(info_ptr->valid & PNG_INFO_sRGB)
+#endif
+      )
+   {
+      png_warning(png_ptr, "Duplicate cHRM chunk");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+
+   if (length != 32)
+   {
+      png_warning(png_ptr, "Incorrect cHRM chunk length");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+
+   png_crc_read(png_ptr, buf, 32);
+   if (png_crc_finish(png_ptr, 0))
+      return;
+
+   uint_x = png_get_uint_32(buf);
+   uint_y = png_get_uint_32(buf + 4);
+   int_x_white = (png_fixed_point)uint_x;
+   int_y_white = (png_fixed_point)uint_y;
+
+   uint_x = png_get_uint_32(buf + 8);
+   uint_y = png_get_uint_32(buf + 12);
+   int_x_red = (png_fixed_point)uint_x;
+   int_y_red = (png_fixed_point)uint_y;
+
+   uint_x = png_get_uint_32(buf + 16);
+   uint_y = png_get_uint_32(buf + 20);
+   int_x_green = (png_fixed_point)uint_x;
+   int_y_green = (png_fixed_point)uint_y;
+
+   uint_x = png_get_uint_32(buf + 24);
+   uint_y = png_get_uint_32(buf + 28);
+   int_x_blue = (png_fixed_point)uint_x;
+   int_y_blue = (png_fixed_point)uint_y;
+
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+   white_x = (float)int_x_white / (float)100000.0;
+   white_y = (float)int_y_white / (float)100000.0;
+   red_x   = (float)int_x_red   / (float)100000.0;
+   red_y   = (float)int_y_red   / (float)100000.0;
+   green_x = (float)int_x_green / (float)100000.0;
+   green_y = (float)int_y_green / (float)100000.0;
+   blue_x  = (float)int_x_blue  / (float)100000.0;
+   blue_y  = (float)int_y_blue  / (float)100000.0;
+#endif
+
+#ifdef PNG_READ_sRGB_SUPPORTED
+   if ((info_ptr != NULL) && (info_ptr->valid & PNG_INFO_sRGB))
+      {
+      if (PNG_OUT_OF_RANGE(int_x_white, 31270,  1000) ||
+          PNG_OUT_OF_RANGE(int_y_white, 32900,  1000) ||
+          PNG_OUT_OF_RANGE(int_x_red,   64000L, 1000) ||
+          PNG_OUT_OF_RANGE(int_y_red,   33000,  1000) ||
+          PNG_OUT_OF_RANGE(int_x_green, 30000,  1000) ||
+          PNG_OUT_OF_RANGE(int_y_green, 60000L, 1000) ||
+          PNG_OUT_OF_RANGE(int_x_blue,  15000,  1000) ||
+          PNG_OUT_OF_RANGE(int_y_blue,   6000,  1000))
+         {
+            png_warning(png_ptr,
+              "Ignoring incorrect cHRM value when sRGB is also present");
+#ifdef PNG_CONSOLE_IO_SUPPORTED
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+            fprintf(stderr, "wx=%f, wy=%f, rx=%f, ry=%f\n",
+               white_x, white_y, red_x, red_y);
+            fprintf(stderr, "gx=%f, gy=%f, bx=%f, by=%f\n",
+               green_x, green_y, blue_x, blue_y);
+#else
+            fprintf(stderr, "wx=%ld, wy=%ld, rx=%ld, ry=%ld\n",
+               (long)int_x_white, (long)int_y_white,
+               (long)int_x_red, (long)int_y_red);
+            fprintf(stderr, "gx=%ld, gy=%ld, bx=%ld, by=%ld\n",
+               (long)int_x_green, (long)int_y_green,
+               (long)int_x_blue, (long)int_y_blue);
+#endif
+#endif /* PNG_CONSOLE_IO_SUPPORTED */
+         }
+         return;
+      }
+#endif /* PNG_READ_sRGB_SUPPORTED */
+
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+   png_set_cHRM(png_ptr, info_ptr,
+      white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+   png_set_cHRM_fixed(png_ptr, info_ptr,
+      int_x_white, int_y_white, int_x_red, int_y_red, int_x_green,
+      int_y_green, int_x_blue, int_y_blue);
+#endif
+}
+#endif
+
+#ifdef PNG_READ_sRGB_SUPPORTED
+void /* PRIVATE */
+png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+{
+   int intent;
+   png_byte buf[1];
+
+   png_debug(1, "in png_handle_sRGB");
+
+   if (!(png_ptr->mode & PNG_HAVE_IHDR))
+      png_error(png_ptr, "Missing IHDR before sRGB");
+   else if (png_ptr->mode & PNG_HAVE_IDAT)
+   {
+      png_warning(png_ptr, "Invalid sRGB after IDAT");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+   else if (png_ptr->mode & PNG_HAVE_PLTE)
+      /* Should be an error, but we can cope with it */
+      png_warning(png_ptr, "Out of place sRGB chunk");
+
+   if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB))
+   {
+      png_warning(png_ptr, "Duplicate sRGB chunk");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+
+   if (length != 1)
+   {
+      png_warning(png_ptr, "Incorrect sRGB chunk length");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+
+   png_crc_read(png_ptr, buf, 1);
+   if (png_crc_finish(png_ptr, 0))
+      return;
+
+   intent = buf[0];
+   /* Check for bad intent */
+   if (intent >= PNG_sRGB_INTENT_LAST)
+   {
+      png_warning(png_ptr, "Unknown sRGB intent");
+      return;
+   }
+
+#if defined(PNG_READ_gAMA_SUPPORTED) && defined(PNG_READ_GAMMA_SUPPORTED)
+   if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA))
+   {
+   png_fixed_point igamma;
+#ifdef PNG_FIXED_POINT_SUPPORTED
+      igamma=info_ptr->int_gamma;
+#else
+#  ifdef PNG_FLOATING_POINT_SUPPORTED
+      igamma=(png_fixed_point)(info_ptr->gamma * 100000.);
+#  endif
+#endif
+      if (PNG_OUT_OF_RANGE(igamma, 45500L, 500))
+      {
+         png_warning(png_ptr,
+           "Ignoring incorrect gAMA value when sRGB is also present");
+#ifdef PNG_CONSOLE_IO_SUPPORTED
+#  ifdef PNG_FIXED_POINT_SUPPORTED
+         fprintf(stderr, "incorrect gamma=(%d/100000)\n",
+            (int)png_ptr->int_gamma);
+#  else
+#    ifdef PNG_FLOATING_POINT_SUPPORTED
+         fprintf(stderr, "incorrect gamma=%f\n", png_ptr->gamma);
+#    endif
+#  endif
+#endif
+      }
+   }
+#endif /* PNG_READ_gAMA_SUPPORTED */
+
+#ifdef PNG_READ_cHRM_SUPPORTED
+#ifdef PNG_FIXED_POINT_SUPPORTED
+   if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))
+      if (PNG_OUT_OF_RANGE(info_ptr->int_x_white, 31270,  1000) ||
+          PNG_OUT_OF_RANGE(info_ptr->int_y_white, 32900,  1000) ||
+          PNG_OUT_OF_RANGE(info_ptr->int_x_red,   64000L, 1000) ||
+          PNG_OUT_OF_RANGE(info_ptr->int_y_red,   33000,  1000) ||
+          PNG_OUT_OF_RANGE(info_ptr->int_x_green, 30000,  1000) ||
+          PNG_OUT_OF_RANGE(info_ptr->int_y_green, 60000L, 1000) ||
+          PNG_OUT_OF_RANGE(info_ptr->int_x_blue,  15000,  1000) ||
+          PNG_OUT_OF_RANGE(info_ptr->int_y_blue,   6000,  1000))
+         {
+            png_warning(png_ptr,
+              "Ignoring incorrect cHRM value when sRGB is also present");
+         }
+#endif /* PNG_FIXED_POINT_SUPPORTED */
+#endif /* PNG_READ_cHRM_SUPPORTED */
+
+   png_set_sRGB_gAMA_and_cHRM(png_ptr, info_ptr, intent);
+}
+#endif /* PNG_READ_sRGB_SUPPORTED */
+
+#ifdef PNG_READ_iCCP_SUPPORTED
+void /* PRIVATE */
+png_handle_iCCP(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+/* Note: this does not properly handle chunks that are > 64K under DOS */
+{
+   png_byte compression_type;
+   png_bytep pC;
+   png_charp profile;
+   png_uint_32 skip = 0;
+   png_uint_32 profile_size, profile_length;
+   png_size_t slength, prefix_length, data_length;
+
+   png_debug(1, "in png_handle_iCCP");
+
+   if (!(png_ptr->mode & PNG_HAVE_IHDR))
+      png_error(png_ptr, "Missing IHDR before iCCP");
+   else if (png_ptr->mode & PNG_HAVE_IDAT)
+   {
+      png_warning(png_ptr, "Invalid iCCP after IDAT");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+   else if (png_ptr->mode & PNG_HAVE_PLTE)
+      /* Should be an error, but we can cope with it */
+      png_warning(png_ptr, "Out of place iCCP chunk");
+
+   if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_iCCP))
+   {
+      png_warning(png_ptr, "Duplicate iCCP chunk");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+
+#ifdef PNG_MAX_MALLOC_64K
+   if (length > (png_uint_32)65535L)
+   {
+      png_warning(png_ptr, "iCCP chunk too large to fit in memory");
+      skip = length - (png_uint_32)65535L;
+      length = (png_uint_32)65535L;
+   }
+#endif
+
+   png_free(png_ptr, png_ptr->chunkdata);
+   png_ptr->chunkdata = (png_charp)png_malloc(png_ptr, length + 1);
+   slength = (png_size_t)length;
+   png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength);
+
+   if (png_crc_finish(png_ptr, skip))
+   {
+      png_free(png_ptr, png_ptr->chunkdata);
+      png_ptr->chunkdata = NULL;
+      return;
+   }
+
+   png_ptr->chunkdata[slength] = 0x00;
+
+   for (profile = png_ptr->chunkdata; *profile; profile++)
+      /* Empty loop to find end of name */ ;
+
+   ++profile;
+
+   /* There should be at least one zero (the compression type byte)
+    * following the separator, and we should be on it
+    */
+   if ( profile >= png_ptr->chunkdata + slength - 1)
+   {
+      png_free(png_ptr, png_ptr->chunkdata);
+      png_ptr->chunkdata = NULL;
+      png_warning(png_ptr, "Malformed iCCP chunk");
+      return;
+   }
+
+   /* Compression_type should always be zero */
+   compression_type = *profile++;
+   if (compression_type)
+   {
+      png_warning(png_ptr, "Ignoring nonzero compression type in iCCP chunk");
+      compression_type = 0x00;  /* Reset it to zero (libpng-1.0.6 through 1.0.8
+                                 wrote nonzero) */
+   }
+
+   prefix_length = profile - png_ptr->chunkdata;
+   png_decompress_chunk(png_ptr, compression_type,
+     slength, prefix_length, &data_length);
+
+   profile_length = data_length - prefix_length;
+
+   if ( prefix_length > data_length || profile_length < 4)
+   {
+      png_free(png_ptr, png_ptr->chunkdata);
+      png_ptr->chunkdata = NULL;
+      png_warning(png_ptr, "Profile size field missing from iCCP chunk");
+      return;
+   }
+
+   /* Check the profile_size recorded in the first 32 bits of the ICC profile */
+   pC = (png_bytep)(png_ptr->chunkdata + prefix_length);
+   profile_size = ((*(pC    ))<<24) |
+                  ((*(pC + 1))<<16) |
+                  ((*(pC + 2))<< 8) |
+                  ((*(pC + 3))    );
+
+   if (profile_size < profile_length)
+      profile_length = profile_size;
+
+   if (profile_size > profile_length)
+   {
+      png_free(png_ptr, png_ptr->chunkdata);
+      png_ptr->chunkdata = NULL;
+      png_warning(png_ptr, "Ignoring truncated iCCP profile.");
+      return;
+   }
+
+   png_set_iCCP(png_ptr, info_ptr, png_ptr->chunkdata,
+     compression_type, png_ptr->chunkdata + prefix_length, profile_length);
+   png_free(png_ptr, png_ptr->chunkdata);
+   png_ptr->chunkdata = NULL;
+}
+#endif /* PNG_READ_iCCP_SUPPORTED */
+
+#ifdef PNG_READ_sPLT_SUPPORTED
+void /* PRIVATE */
+png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+/* Note: this does not properly handle chunks that are > 64K under DOS */
+{
+   png_bytep entry_start;
+   png_sPLT_t new_palette;
+#ifdef PNG_POINTER_INDEXING_SUPPORTED
+   png_sPLT_entryp pp;
+#endif
+   int data_length, entry_size, i;
+   png_uint_32 skip = 0;
+   png_size_t slength;
+
+   png_debug(1, "in png_handle_sPLT");
+
+#ifdef PNG_USER_LIMITS_SUPPORTED
+
+   if (png_ptr->user_chunk_cache_max != 0)
+   {
+      if (png_ptr->user_chunk_cache_max == 1)
+      {
+         png_crc_finish(png_ptr, length);
+         return;
+      }
+      if (--png_ptr->user_chunk_cache_max == 1)
+      {
+         png_warning(png_ptr, "No space in chunk cache for sPLT");
+         png_crc_finish(png_ptr, length);
+         return;
+      }
+   }
+#endif
+
+   if (!(png_ptr->mode & PNG_HAVE_IHDR))
+      png_error(png_ptr, "Missing IHDR before sPLT");
+   else if (png_ptr->mode & PNG_HAVE_IDAT)
+   {
+      png_warning(png_ptr, "Invalid sPLT after IDAT");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+
+#ifdef PNG_MAX_MALLOC_64K
+   if (length > (png_uint_32)65535L)
+   {
+      png_warning(png_ptr, "sPLT chunk too large to fit in memory");
+      skip = length - (png_uint_32)65535L;
+      length = (png_uint_32)65535L;
+   }
+#endif
+
+   png_free(png_ptr, png_ptr->chunkdata);
+   png_ptr->chunkdata = (png_charp)png_malloc(png_ptr, length + 1);
+   slength = (png_size_t)length;
+   png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength);
+
+   if (png_crc_finish(png_ptr, skip))
+   {
+      png_free(png_ptr, png_ptr->chunkdata);
+      png_ptr->chunkdata = NULL;
+      return;
+   }
+
+   png_ptr->chunkdata[slength] = 0x00;
+
+   for (entry_start = (png_bytep)png_ptr->chunkdata; *entry_start;
+       entry_start++)
+      /* Empty loop to find end of name */ ;
+   ++entry_start;
+
+   /* A sample depth should follow the separator, and we should be on it  */
+   if (entry_start > (png_bytep)png_ptr->chunkdata + slength - 2)
+   {
+      png_free(png_ptr, png_ptr->chunkdata);
+      png_ptr->chunkdata = NULL;
+      png_warning(png_ptr, "malformed sPLT chunk");
+      return;
+   }
+
+   new_palette.depth = *entry_start++;
+   entry_size = (new_palette.depth == 8 ? 6 : 10);
+   data_length = (slength - (entry_start - (png_bytep)png_ptr->chunkdata));
+
+   /* Integrity-check the data length */
+   if (data_length % entry_size)
+   {
+      png_free(png_ptr, png_ptr->chunkdata);
+      png_ptr->chunkdata = NULL;
+      png_warning(png_ptr, "sPLT chunk has bad length");
+      return;
+   }
+
+   new_palette.nentries = (png_int_32) ( data_length / entry_size);
+   if ((png_uint_32) new_palette.nentries >
+       (png_uint_32) (PNG_SIZE_MAX / png_sizeof(png_sPLT_entry)))
+   {
+       png_warning(png_ptr, "sPLT chunk too long");
+       return;
+   }
+   new_palette.entries = (png_sPLT_entryp)png_malloc_warn(
+       png_ptr, new_palette.nentries * png_sizeof(png_sPLT_entry));
+   if (new_palette.entries == NULL)
+   {
+       png_warning(png_ptr, "sPLT chunk requires too much memory");
+       return;
+   }
+
+#ifdef PNG_POINTER_INDEXING_SUPPORTED
+   for (i = 0; i < new_palette.nentries; i++)
+   {
+      pp = new_palette.entries + i;
+
+      if (new_palette.depth == 8)
+      {
+          pp->red = *entry_start++;
+          pp->green = *entry_start++;
+          pp->blue = *entry_start++;
+          pp->alpha = *entry_start++;
+      }
+      else
+      {
+          pp->red   = png_get_uint_16(entry_start); entry_start += 2;
+          pp->green = png_get_uint_16(entry_start); entry_start += 2;
+          pp->blue  = png_get_uint_16(entry_start); entry_start += 2;
+          pp->alpha = png_get_uint_16(entry_start); entry_start += 2;
+      }
+      pp->frequency = png_get_uint_16(entry_start); entry_start += 2;
+   }
+#else
+   pp = new_palette.entries;
+   for (i = 0; i < new_palette.nentries; i++)
+   {
+
+      if (new_palette.depth == 8)
+      {
+          pp[i].red   = *entry_start++;
+          pp[i].green = *entry_start++;
+          pp[i].blue  = *entry_start++;
+          pp[i].alpha = *entry_start++;
+      }
+      else
+      {
+          pp[i].red   = png_get_uint_16(entry_start); entry_start += 2;
+          pp[i].green = png_get_uint_16(entry_start); entry_start += 2;
+          pp[i].blue  = png_get_uint_16(entry_start); entry_start += 2;
+          pp[i].alpha = png_get_uint_16(entry_start); entry_start += 2;
+      }
+      pp->frequency = png_get_uint_16(entry_start); entry_start += 2;
+   }
+#endif
+
+   /* Discard all chunk data except the name and stash that */
+   new_palette.name = png_ptr->chunkdata;
+
+   png_set_sPLT(png_ptr, info_ptr, &new_palette, 1);
+
+   png_free(png_ptr, png_ptr->chunkdata);
+   png_ptr->chunkdata = NULL;
+   png_free(png_ptr, new_palette.entries);
+}
+#endif /* PNG_READ_sPLT_SUPPORTED */
+
+#ifdef PNG_READ_tRNS_SUPPORTED
+void /* PRIVATE */
+png_handle_tRNS(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+{
+   png_byte readbuf[PNG_MAX_PALETTE_LENGTH];
+
+   png_debug(1, "in png_handle_tRNS");
+
+   if (!(png_ptr->mode & PNG_HAVE_IHDR))
+      png_error(png_ptr, "Missing IHDR before tRNS");
+   else if (png_ptr->mode & PNG_HAVE_IDAT)
+   {
+      png_warning(png_ptr, "Invalid tRNS after IDAT");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+   else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
+   {
+      png_warning(png_ptr, "Duplicate tRNS chunk");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+
+   if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY)
+   {
+      png_byte buf[2];
+
+      if (length != 2)
+      {
+         png_warning(png_ptr, "Incorrect tRNS chunk length");
+         png_crc_finish(png_ptr, length);
+         return;
+      }
+
+      png_crc_read(png_ptr, buf, 2);
+      png_ptr->num_trans = 1;
+      png_ptr->trans_values.gray = png_get_uint_16(buf);
+   }
+   else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)
+   {
+      png_byte buf[6];
+
+      if (length != 6)
+      {
+         png_warning(png_ptr, "Incorrect tRNS chunk length");
+         png_crc_finish(png_ptr, length);
+         return;
+      }
+      png_crc_read(png_ptr, buf, (png_size_t)length);
+      png_ptr->num_trans = 1;
+      png_ptr->trans_values.red = png_get_uint_16(buf);
+      png_ptr->trans_values.green = png_get_uint_16(buf + 2);
+      png_ptr->trans_values.blue = png_get_uint_16(buf + 4);
+   }
+   else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
+   {
+      if (!(png_ptr->mode & PNG_HAVE_PLTE))
+      {
+         /* Should be an error, but we can cope with it. */
+         png_warning(png_ptr, "Missing PLTE before tRNS");
+      }
+      if (length > (png_uint_32)png_ptr->num_palette ||
+          length > PNG_MAX_PALETTE_LENGTH)
+      {
+         png_warning(png_ptr, "Incorrect tRNS chunk length");
+         png_crc_finish(png_ptr, length);
+         return;
+      }
+      if (length == 0)
+      {
+         png_warning(png_ptr, "Zero length tRNS chunk");
+         png_crc_finish(png_ptr, length);
+         return;
+      }
+      png_crc_read(png_ptr, readbuf, (png_size_t)length);
+      png_ptr->num_trans = (png_uint_16)length;
+   }
+   else
+   {
+      png_warning(png_ptr, "tRNS chunk not allowed with alpha channel");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+
+   if (png_crc_finish(png_ptr, 0))
+   {
+      png_ptr->num_trans = 0;
+      return;
+   }
+
+   png_set_tRNS(png_ptr, info_ptr, readbuf, png_ptr->num_trans,
+      &(png_ptr->trans_values));
+}
+#endif
+
+#ifdef PNG_READ_bKGD_SUPPORTED
+void /* PRIVATE */
+png_handle_bKGD(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+{
+   png_size_t truelen;
+   png_byte buf[6];
+
+   png_debug(1, "in png_handle_bKGD");
+
+   if (!(png_ptr->mode & PNG_HAVE_IHDR))
+      png_error(png_ptr, "Missing IHDR before bKGD");
+   else if (png_ptr->mode & PNG_HAVE_IDAT)
+   {
+      png_warning(png_ptr, "Invalid bKGD after IDAT");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+   else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
+            !(png_ptr->mode & PNG_HAVE_PLTE))
+   {
+      png_warning(png_ptr, "Missing PLTE before bKGD");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+   else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD))
+   {
+      png_warning(png_ptr, "Duplicate bKGD chunk");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+
+   if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
+      truelen = 1;
+   else if (png_ptr->color_type & PNG_COLOR_MASK_COLOR)
+      truelen = 6;
+   else
+      truelen = 2;
+
+   if (length != truelen)
+   {
+      png_warning(png_ptr, "Incorrect bKGD chunk length");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+
+   png_crc_read(png_ptr, buf, truelen);
+   if (png_crc_finish(png_ptr, 0))
+      return;
+
+   /* We convert the index value into RGB components so that we can allow
+    * arbitrary RGB values for background when we have transparency, and
+    * so it is easy to determine the RGB values of the background color
+    * from the info_ptr struct. */
+   if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
+   {
+      png_ptr->background.index = buf[0];
+      if (info_ptr && info_ptr->num_palette)
+      {
+          if (buf[0] >= info_ptr->num_palette)
+          {
+             png_warning(png_ptr, "Incorrect bKGD chunk index value");
+             return;
+          }
+          png_ptr->background.red =
+             (png_uint_16)png_ptr->palette[buf[0]].red;
+          png_ptr->background.green =
+             (png_uint_16)png_ptr->palette[buf[0]].green;
+          png_ptr->background.blue =
+             (png_uint_16)png_ptr->palette[buf[0]].blue;
+      }
+   }
+   else if (!(png_ptr->color_type & PNG_COLOR_MASK_COLOR)) /* GRAY */
+   {
+      png_ptr->background.red =
+      png_ptr->background.green =
+      png_ptr->background.blue =
+      png_ptr->background.gray = png_get_uint_16(buf);
+   }
+   else
+   {
+      png_ptr->background.red = png_get_uint_16(buf);
+      png_ptr->background.green = png_get_uint_16(buf + 2);
+      png_ptr->background.blue = png_get_uint_16(buf + 4);
+   }
+
+   png_set_bKGD(png_ptr, info_ptr, &(png_ptr->background));
+}
+#endif
+
+#ifdef PNG_READ_hIST_SUPPORTED
+void /* PRIVATE */
+png_handle_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+{
+   unsigned int num, i;
+   png_uint_16 readbuf[PNG_MAX_PALETTE_LENGTH];
+
+   png_debug(1, "in png_handle_hIST");
+
+   if (!(png_ptr->mode & PNG_HAVE_IHDR))
+      png_error(png_ptr, "Missing IHDR before hIST");
+   else if (png_ptr->mode & PNG_HAVE_IDAT)
+   {
+      png_warning(png_ptr, "Invalid hIST after IDAT");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+   else if (!(png_ptr->mode & PNG_HAVE_PLTE))
+   {
+      png_warning(png_ptr, "Missing PLTE before hIST");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+   else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST))
+   {
+      png_warning(png_ptr, "Duplicate hIST chunk");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+
+   num = length / 2 ;
+   if (num != (unsigned int) png_ptr->num_palette || num >
+      (unsigned int) PNG_MAX_PALETTE_LENGTH)
+   {
+      png_warning(png_ptr, "Incorrect hIST chunk length");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+
+   for (i = 0; i < num; i++)
+   {
+      png_byte buf[2];
+
+      png_crc_read(png_ptr, buf, 2);
+      readbuf[i] = png_get_uint_16(buf);
+   }
+
+   if (png_crc_finish(png_ptr, 0))
+      return;
+
+   png_set_hIST(png_ptr, info_ptr, readbuf);
+}
+#endif
+
+#ifdef PNG_READ_pHYs_SUPPORTED
+void /* PRIVATE */
+png_handle_pHYs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+{
+   png_byte buf[9];
+   png_uint_32 res_x, res_y;
+   int unit_type;
+
+   png_debug(1, "in png_handle_pHYs");
+
+   if (!(png_ptr->mode & PNG_HAVE_IHDR))
+      png_error(png_ptr, "Missing IHDR before pHYs");
+   else if (png_ptr->mode & PNG_HAVE_IDAT)
+   {
+      png_warning(png_ptr, "Invalid pHYs after IDAT");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+   else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
+   {
+      png_warning(png_ptr, "Duplicate pHYs chunk");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+
+   if (length != 9)
+   {
+      png_warning(png_ptr, "Incorrect pHYs chunk length");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+
+   png_crc_read(png_ptr, buf, 9);
+   if (png_crc_finish(png_ptr, 0))
+      return;
+
+   res_x = png_get_uint_32(buf);
+   res_y = png_get_uint_32(buf + 4);
+   unit_type = buf[8];
+   png_set_pHYs(png_ptr, info_ptr, res_x, res_y, unit_type);
+}
+#endif
+
+#ifdef PNG_READ_oFFs_SUPPORTED
+void /* PRIVATE */
+png_handle_oFFs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+{
+   png_byte buf[9];
+   png_int_32 offset_x, offset_y;
+   int unit_type;
+
+   png_debug(1, "in png_handle_oFFs");
+
+   if (!(png_ptr->mode & PNG_HAVE_IHDR))
+      png_error(png_ptr, "Missing IHDR before oFFs");
+   else if (png_ptr->mode & PNG_HAVE_IDAT)
+   {
+      png_warning(png_ptr, "Invalid oFFs after IDAT");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+   else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
+   {
+      png_warning(png_ptr, "Duplicate oFFs chunk");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+
+   if (length != 9)
+   {
+      png_warning(png_ptr, "Incorrect oFFs chunk length");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+
+   png_crc_read(png_ptr, buf, 9);
+   if (png_crc_finish(png_ptr, 0))
+      return;
+
+   offset_x = png_get_int_32(buf);
+   offset_y = png_get_int_32(buf + 4);
+   unit_type = buf[8];
+   png_set_oFFs(png_ptr, info_ptr, offset_x, offset_y, unit_type);
+}
+#endif
+
+#ifdef PNG_READ_pCAL_SUPPORTED
+/* Read the pCAL chunk (described in the PNG Extensions document) */
+void /* PRIVATE */
+png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+{
+   png_int_32 X0, X1;
+   png_byte type, nparams;
+   png_charp buf, units, endptr;
+   png_charpp params;
+   png_size_t slength;
+   int i;
+
+   png_debug(1, "in png_handle_pCAL");
+
+   if (!(png_ptr->mode & PNG_HAVE_IHDR))
+      png_error(png_ptr, "Missing IHDR before pCAL");
+   else if (png_ptr->mode & PNG_HAVE_IDAT)
+   {
+      png_warning(png_ptr, "Invalid pCAL after IDAT");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+   else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL))
+   {
+      png_warning(png_ptr, "Duplicate pCAL chunk");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+
+   png_debug1(2, "Allocating and reading pCAL chunk data (%lu bytes)",
+      length + 1);
+   png_free(png_ptr, png_ptr->chunkdata);
+   png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1);
+   if (png_ptr->chunkdata == NULL)
+     {
+       png_warning(png_ptr, "No memory for pCAL purpose.");
+       return;
+     }
+   slength = (png_size_t)length;
+   png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength);
+
+   if (png_crc_finish(png_ptr, 0))
+   {
+      png_free(png_ptr, png_ptr->chunkdata);
+      png_ptr->chunkdata = NULL;
+      return;
+   }
+
+   png_ptr->chunkdata[slength] = 0x00; /* Null terminate the last string */
+
+   png_debug(3, "Finding end of pCAL purpose string");
+   for (buf = png_ptr->chunkdata; *buf; buf++)
+      /* Empty loop */ ;
+
+   endptr = png_ptr->chunkdata + slength;
+
+   /* We need to have at least 12 bytes after the purpose string
+      in order to get the parameter information. */
+   if (endptr <= buf + 12)
+   {
+      png_warning(png_ptr, "Invalid pCAL data");
+      png_free(png_ptr, png_ptr->chunkdata);
+      png_ptr->chunkdata = NULL;
+      return;
+   }
+
+   png_debug(3, "Reading pCAL X0, X1, type, nparams, and units");
+   X0 = png_get_int_32((png_bytep)buf+1);
+   X1 = png_get_int_32((png_bytep)buf+5);
+   type = buf[9];
+   nparams = buf[10];
+   units = buf + 11;
+
+   png_debug(3, "Checking pCAL equation type and number of parameters");
+   /* Check that we have the right number of parameters for known
+      equation types. */
+   if ((type == PNG_EQUATION_LINEAR && nparams != 2) ||
+       (type == PNG_EQUATION_BASE_E && nparams != 3) ||
+       (type == PNG_EQUATION_ARBITRARY && nparams != 3) ||
+       (type == PNG_EQUATION_HYPERBOLIC && nparams != 4))
+   {
+      png_warning(png_ptr, "Invalid pCAL parameters for equation type");
+      png_free(png_ptr, png_ptr->chunkdata);
+      png_ptr->chunkdata = NULL;
+      return;
+   }
+   else if (type >= PNG_EQUATION_LAST)
+   {
+      png_warning(png_ptr, "Unrecognized equation type for pCAL chunk");
+   }
+
+   for (buf = units; *buf; buf++)
+      /* Empty loop to move past the units string. */ ;
+
+   png_debug(3, "Allocating pCAL parameters array");
+   params = (png_charpp)png_malloc_warn(png_ptr,
+      (png_uint_32)(nparams * png_sizeof(png_charp))) ;
+   if (params == NULL)
+     {
+       png_free(png_ptr, png_ptr->chunkdata);
+       png_ptr->chunkdata = NULL;
+       png_warning(png_ptr, "No memory for pCAL params.");
+       return;
+     }
+
+   /* Get pointers to the start of each parameter string. */
+   for (i = 0; i < (int)nparams; i++)
+   {
+      buf++; /* Skip the null string terminator from previous parameter. */
+
+      png_debug1(3, "Reading pCAL parameter %d", i);
+      for (params[i] = buf; buf <= endptr && *buf != 0x00; buf++)
+         /* Empty loop to move past each parameter string */ ;
+
+      /* Make sure we haven't run out of data yet */
+      if (buf > endptr)
+      {
+         png_warning(png_ptr, "Invalid pCAL data");
+         png_free(png_ptr, png_ptr->chunkdata);
+         png_ptr->chunkdata = NULL;
+         png_free(png_ptr, params);
+         return;
+      }
+   }
+
+   png_set_pCAL(png_ptr, info_ptr, png_ptr->chunkdata, X0, X1, type, nparams,
+      units, params);
+
+   png_free(png_ptr, png_ptr->chunkdata);
+   png_ptr->chunkdata = NULL;
+   png_free(png_ptr, params);
+}
+#endif
+
+#ifdef PNG_READ_sCAL_SUPPORTED
+/* Read the sCAL chunk */
+void /* PRIVATE */
+png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+{
+   png_charp ep;
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+   double width, height;
+   png_charp vp;
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+   png_charp swidth, sheight;
+#endif
+#endif
+   png_size_t slength;
+
+   png_debug(1, "in png_handle_sCAL");
+
+   if (!(png_ptr->mode & PNG_HAVE_IHDR))
+      png_error(png_ptr, "Missing IHDR before sCAL");
+   else if (png_ptr->mode & PNG_HAVE_IDAT)
+   {
+      png_warning(png_ptr, "Invalid sCAL after IDAT");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+   else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sCAL))
+   {
+      png_warning(png_ptr, "Duplicate sCAL chunk");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+
+   /* Need unit type, width, \0, height: minimum 4 bytes */
+   else if (length < 4)
+   {
+      png_warning(png_ptr, "sCAL chunk too short");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+
+   png_debug1(2, "Allocating and reading sCAL chunk data (%lu bytes)",
+      length + 1);
+   png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1);
+   if (png_ptr->chunkdata == NULL)
+   {
+      png_warning(png_ptr, "Out of memory while processing sCAL chunk");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+   slength = (png_size_t)length;
+   png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength);
+
+   if (png_crc_finish(png_ptr, 0))
+   {
+      png_free(png_ptr, png_ptr->chunkdata);
+      png_ptr->chunkdata = NULL;
+      return;
+   }
+
+   png_ptr->chunkdata[slength] = 0x00; /* Null terminate the last string */
+
+   ep = png_ptr->chunkdata + 1;        /* Skip unit byte */
+
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+   width = png_strtod(png_ptr, ep, &vp);
+   if (*vp)
+   {
+      png_warning(png_ptr, "malformed width string in sCAL chunk");
+      png_free(png_ptr, png_ptr->chunkdata);
+      png_ptr->chunkdata = NULL;
+      return;
+   }
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+   swidth = (png_charp)png_malloc_warn(png_ptr, png_strlen(ep) + 1);
+   if (swidth == NULL)
+   {
+      png_warning(png_ptr, "Out of memory while processing sCAL chunk width");
+      png_free(png_ptr, png_ptr->chunkdata);
+      png_ptr->chunkdata = NULL;
+      return;
+   }
+   png_memcpy(swidth, ep, (png_size_t)png_strlen(ep));
+#endif
+#endif
+
+   for (ep = png_ptr->chunkdata; *ep; ep++)
+      /* Empty loop */ ;
+   ep++;
+
+   if (png_ptr->chunkdata + slength < ep)
+   {
+      png_warning(png_ptr, "Truncated sCAL chunk");
+#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
+      png_free(png_ptr, swidth);
+#endif
+      png_free(png_ptr, png_ptr->chunkdata);
+      png_ptr->chunkdata = NULL;
+      return;
+   }
+
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+   height = png_strtod(png_ptr, ep, &vp);
+   if (*vp)
+   {
+      png_warning(png_ptr, "malformed height string in sCAL chunk");
+      png_free(png_ptr, png_ptr->chunkdata);
+      png_ptr->chunkdata = NULL;
+#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
+      png_free(png_ptr, swidth);
+#endif
+      return;
+   }
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+   sheight = (png_charp)png_malloc_warn(png_ptr, png_strlen(ep) + 1);
+   if (sheight == NULL)
+   {
+      png_warning(png_ptr, "Out of memory while processing sCAL chunk height");
+      png_free(png_ptr, png_ptr->chunkdata);
+      png_ptr->chunkdata = NULL;
+#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
+      png_free(png_ptr, swidth);
+#endif
+      return;
+   }
+   png_memcpy(sheight, ep, (png_size_t)png_strlen(ep));
+#endif
+#endif
+
+   if (png_ptr->chunkdata + slength < ep
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+      || width <= 0. || height <= 0.
+#endif
+      )
+   {
+      png_warning(png_ptr, "Invalid sCAL data");
+      png_free(png_ptr, png_ptr->chunkdata);
+      png_ptr->chunkdata = NULL;
+#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
+      png_free(png_ptr, swidth);
+      png_free(png_ptr, sheight);
+#endif
+      return;
+   }
+
+
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+   png_set_sCAL(png_ptr, info_ptr, png_ptr->chunkdata[0], width, height);
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+   png_set_sCAL_s(png_ptr, info_ptr, png_ptr->chunkdata[0], swidth, sheight);
+#endif
+#endif
+
+   png_free(png_ptr, png_ptr->chunkdata);
+   png_ptr->chunkdata = NULL;
+#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
+   png_free(png_ptr, swidth);
+   png_free(png_ptr, sheight);
+#endif
+}
+#endif
+
+#ifdef PNG_READ_tIME_SUPPORTED
+void /* PRIVATE */
+png_handle_tIME(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+{
+   png_byte buf[7];
+   png_time mod_time;
+
+   png_debug(1, "in png_handle_tIME");
+
+   if (!(png_ptr->mode & PNG_HAVE_IHDR))
+      png_error(png_ptr, "Out of place tIME chunk");
+   else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME))
+   {
+      png_warning(png_ptr, "Duplicate tIME chunk");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+
+   if (png_ptr->mode & PNG_HAVE_IDAT)
+      png_ptr->mode |= PNG_AFTER_IDAT;
+
+   if (length != 7)
+   {
+      png_warning(png_ptr, "Incorrect tIME chunk length");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
+
+   png_crc_read(png_ptr, buf, 7);
+   if (png_crc_finish(png_ptr, 0))
+      return;
+
+   mod_time.second = buf[6];
+   mod_time.minute = buf[5];
+   mod_time.hour = buf[4];
+   mod_time.day = buf[3];
+   mod_time.month = buf[2];
+   mod_time.year = png_get_uint_16(buf);
+
+   png_set_tIME(png_ptr, info_ptr, &mod_time);
+}
+#endif
+
+#ifdef PNG_READ_tEXt_SUPPORTED
+/* Note: this does not properly handle chunks that are > 64K under DOS */
+void /* PRIVATE */
+png_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+{
+   png_textp text_ptr;
+   png_charp key;
+   png_charp text;
+   png_uint_32 skip = 0;
+   png_size_t slength;
+   int ret;
+
+   png_debug(1, "in png_handle_tEXt");
+
+#ifdef PNG_USER_LIMITS_SUPPORTED
+   if (png_ptr->user_chunk_cache_max != 0)
+   {
+      if (png_ptr->user_chunk_cache_max == 1)
+      {
+         png_crc_finish(png_ptr, length);
+         return;
+      }
+      if (--png_ptr->user_chunk_cache_max == 1)
+      {
+         png_warning(png_ptr, "No space in chunk cache for tEXt");
+         png_crc_finish(png_ptr, length);
+         return;
+      }
+   }
+#endif
+
+   if (!(png_ptr->mode & PNG_HAVE_IHDR))
+      png_error(png_ptr, "Missing IHDR before tEXt");
+
+   if (png_ptr->mode & PNG_HAVE_IDAT)
+      png_ptr->mode |= PNG_AFTER_IDAT;
+
+#ifdef PNG_MAX_MALLOC_64K
+   if (length > (png_uint_32)65535L)
+   {
+      png_warning(png_ptr, "tEXt chunk too large to fit in memory");
+      skip = length - (png_uint_32)65535L;
+      length = (png_uint_32)65535L;
+   }
+#endif
+
+   png_free(png_ptr, png_ptr->chunkdata);
+
+   png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1);
+   if (png_ptr->chunkdata == NULL)
+   {
+     png_warning(png_ptr, "No memory to process text chunk.");
+     return;
+   }
+   slength = (png_size_t)length;
+   png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength);
+
+   if (png_crc_finish(png_ptr, skip))
+   {
+      png_free(png_ptr, png_ptr->chunkdata);
+      png_ptr->chunkdata = NULL;
+      return;
+   }
+
+   key = png_ptr->chunkdata;
+
+   key[slength] = 0x00;
+
+   for (text = key; *text; text++)
+      /* Empty loop to find end of key */ ;
+
+   if (text != key + slength)
+      text++;
+
+   text_ptr = (png_textp)png_malloc_warn(png_ptr,
+      (png_uint_32)png_sizeof(png_text));
+   if (text_ptr == NULL)
+   {
+     png_warning(png_ptr, "Not enough memory to process text chunk.");
+     png_free(png_ptr, png_ptr->chunkdata);
+     png_ptr->chunkdata = NULL;
+     return;
+   }
+   text_ptr->compression = PNG_TEXT_COMPRESSION_NONE;
+   text_ptr->key = key;
+#ifdef PNG_iTXt_SUPPORTED
+   text_ptr->lang = NULL;
+   text_ptr->lang_key = NULL;
+   text_ptr->itxt_length = 0;
+#endif
+   text_ptr->text = text;
+   text_ptr->text_length = png_strlen(text);
+
+   ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
+
+   png_free(png_ptr, png_ptr->chunkdata);
+   png_ptr->chunkdata = NULL;
+   png_free(png_ptr, text_ptr);
+   if (ret)
+     png_warning(png_ptr, "Insufficient memory to process text chunk.");
+}
+#endif
+
+#ifdef PNG_READ_zTXt_SUPPORTED
+/* Note: this does not correctly handle chunks that are > 64K under DOS */
+void /* PRIVATE */
+png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+{
+   png_textp text_ptr;
+   png_charp text;
+   int comp_type;
+   int ret;
+   png_size_t slength, prefix_len, data_len;
+
+   png_debug(1, "in png_handle_zTXt");
+
+#ifdef PNG_USER_LIMITS_SUPPORTED
+   if (png_ptr->user_chunk_cache_max != 0)
+   {
+      if (png_ptr->user_chunk_cache_max == 1)
+      {
+         png_crc_finish(png_ptr, length);
+         return;
+      }
+      if (--png_ptr->user_chunk_cache_max == 1)
+      {
+         png_warning(png_ptr, "No space in chunk cache for zTXt");
+         png_crc_finish(png_ptr, length);
+         return;
+      }
+   }
+#endif
+
+   if (!(png_ptr->mode & PNG_HAVE_IHDR))
+      png_error(png_ptr, "Missing IHDR before zTXt");
+
+   if (png_ptr->mode & PNG_HAVE_IDAT)
+      png_ptr->mode |= PNG_AFTER_IDAT;
+
+#ifdef PNG_MAX_MALLOC_64K
+   /* We will no doubt have problems with chunks even half this size, but
+      there is no hard and fast rule to tell us where to stop. */
+   if (length > (png_uint_32)65535L)
+   {
+     png_warning(png_ptr, "zTXt chunk too large to fit in memory");
+     png_crc_finish(png_ptr, length);
+     return;
+   }
+#endif
+
+   png_free(png_ptr, png_ptr->chunkdata);
+   png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1);
+   if (png_ptr->chunkdata == NULL)
+   {
+     png_warning(png_ptr, "Out of memory processing zTXt chunk.");
+     return;
+   }
+   slength = (png_size_t)length;
+   png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength);
+   if (png_crc_finish(png_ptr, 0))
+   {
+      png_free(png_ptr, png_ptr->chunkdata);
+      png_ptr->chunkdata = NULL;
+      return;
+   }
+
+   png_ptr->chunkdata[slength] = 0x00;
+
+   for (text = png_ptr->chunkdata; *text; text++)
+      /* Empty loop */ ;
+
+   /* zTXt must have some text after the chunkdataword */
+   if (text >= png_ptr->chunkdata + slength - 2)
+   {
+      png_warning(png_ptr, "Truncated zTXt chunk");
+      png_free(png_ptr, png_ptr->chunkdata);
+      png_ptr->chunkdata = NULL;
+      return;
+   }
+   else
+   {
+       comp_type = *(++text);
+       if (comp_type != PNG_TEXT_COMPRESSION_zTXt)
+       {
+          png_warning(png_ptr, "Unknown compression type in zTXt chunk");
+          comp_type = PNG_TEXT_COMPRESSION_zTXt;
+       }
+       text++;        /* Skip the compression_method byte */
+   }
+   prefix_len = text - png_ptr->chunkdata;
+
+   png_decompress_chunk(png_ptr, comp_type,
+     (png_size_t)length, prefix_len, &data_len);
+
+   text_ptr = (png_textp)png_malloc_warn(png_ptr,
+      (png_uint_32)png_sizeof(png_text));
+   if (text_ptr == NULL)
+   {
+     png_warning(png_ptr, "Not enough memory to process zTXt chunk.");
+     png_free(png_ptr, png_ptr->chunkdata);
+     png_ptr->chunkdata = NULL;
+     return;
+   }
+   text_ptr->compression = comp_type;
+   text_ptr->key = png_ptr->chunkdata;
+#ifdef PNG_iTXt_SUPPORTED
+   text_ptr->lang = NULL;
+   text_ptr->lang_key = NULL;
+   text_ptr->itxt_length = 0;
+#endif
+   text_ptr->text = png_ptr->chunkdata + prefix_len;
+   text_ptr->text_length = data_len;
+
+   ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
+
+   png_free(png_ptr, text_ptr);
+   png_free(png_ptr, png_ptr->chunkdata);
+   png_ptr->chunkdata = NULL;
+   if (ret)
+     png_error(png_ptr, "Insufficient memory to store zTXt chunk.");
+}
+#endif
+
+#ifdef PNG_READ_iTXt_SUPPORTED
+/* Note: this does not correctly handle chunks that are > 64K under DOS */
+void /* PRIVATE */
+png_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+{
+   png_textp text_ptr;
+   png_charp key, lang, text, lang_key;
+   int comp_flag;
+   int comp_type = 0;
+   int ret;
+   png_size_t slength, prefix_len, data_len;
+
+   png_debug(1, "in png_handle_iTXt");
+
+#ifdef PNG_USER_LIMITS_SUPPORTED
+   if (png_ptr->user_chunk_cache_max != 0)
+   {
+      if (png_ptr->user_chunk_cache_max == 1)
+      {
+         png_crc_finish(png_ptr, length);
+         return;
+      }
+      if (--png_ptr->user_chunk_cache_max == 1)
+      {
+         png_warning(png_ptr, "No space in chunk cache for iTXt");
+         png_crc_finish(png_ptr, length);
+         return;
+      }
+   }
+#endif
+
+   if (!(png_ptr->mode & PNG_HAVE_IHDR))
+      png_error(png_ptr, "Missing IHDR before iTXt");
+
+   if (png_ptr->mode & PNG_HAVE_IDAT)
+      png_ptr->mode |= PNG_AFTER_IDAT;
+
+#ifdef PNG_MAX_MALLOC_64K
+   /* We will no doubt have problems with chunks even half this size, but
+      there is no hard and fast rule to tell us where to stop. */
+   if (length > (png_uint_32)65535L)
+   {
+     png_warning(png_ptr, "iTXt chunk too large to fit in memory");
+     png_crc_finish(png_ptr, length);
+     return;
+   }
+#endif
+
+   png_free(png_ptr, png_ptr->chunkdata);
+   png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1);
+   if (png_ptr->chunkdata == NULL)
+   {
+     png_warning(png_ptr, "No memory to process iTXt chunk.");
+     return;
+   }
+   slength = (png_size_t)length;
+   png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength);
+   if (png_crc_finish(png_ptr, 0))
+   {
+      png_free(png_ptr, png_ptr->chunkdata);
+      png_ptr->chunkdata = NULL;
+      return;
+   }
+
+   png_ptr->chunkdata[slength] = 0x00;
+
+   for (lang = png_ptr->chunkdata; *lang; lang++)
+      /* Empty loop */ ;
+   lang++;        /* Skip NUL separator */
+
+   /* iTXt must have a language tag (possibly empty), two compression bytes,
+    * translated keyword (possibly empty), and possibly some text after the
+    * keyword
+    */
+
+   if (lang >= png_ptr->chunkdata + slength - 3)
+   {
+      png_warning(png_ptr, "Truncated iTXt chunk");
+      png_free(png_ptr, png_ptr->chunkdata);
+      png_ptr->chunkdata = NULL;
+      return;
+   }
+   else
+   {
+       comp_flag = *lang++;
+       comp_type = *lang++;
+   }
+
+   for (lang_key = lang; *lang_key; lang_key++)
+      /* Empty loop */ ;
+   lang_key++;        /* Skip NUL separator */
+
+   if (lang_key >= png_ptr->chunkdata + slength)
+   {
+      png_warning(png_ptr, "Truncated iTXt chunk");
+      png_free(png_ptr, png_ptr->chunkdata);
+      png_ptr->chunkdata = NULL;
+      return;
+   }
+
+   for (text = lang_key; *text; text++)
+      /* Empty loop */ ;
+   text++;        /* Skip NUL separator */
+   if (text >= png_ptr->chunkdata + slength)
+   {
+      png_warning(png_ptr, "Malformed iTXt chunk");
+      png_free(png_ptr, png_ptr->chunkdata);
+      png_ptr->chunkdata = NULL;
+      return;
+   }
+
+   prefix_len = text - png_ptr->chunkdata;
+
+   key=png_ptr->chunkdata;
+   if (comp_flag)
+       png_decompress_chunk(png_ptr, comp_type,
+         (size_t)length, prefix_len, &data_len);
+   else
+       data_len = png_strlen(png_ptr->chunkdata + prefix_len);
+   text_ptr = (png_textp)png_malloc_warn(png_ptr,
+      (png_uint_32)png_sizeof(png_text));
+   if (text_ptr == NULL)
+   {
+     png_warning(png_ptr, "Not enough memory to process iTXt chunk.");
+     png_free(png_ptr, png_ptr->chunkdata);
+     png_ptr->chunkdata = NULL;
+     return;
+   }
+   text_ptr->compression = (int)comp_flag + 1;
+   text_ptr->lang_key = png_ptr->chunkdata + (lang_key - key);
+   text_ptr->lang = png_ptr->chunkdata + (lang - key);
+   text_ptr->itxt_length = data_len;
+   text_ptr->text_length = 0;
+   text_ptr->key = png_ptr->chunkdata;
+   text_ptr->text = png_ptr->chunkdata + prefix_len;
+
+   ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
+
+   png_free(png_ptr, text_ptr);
+   png_free(png_ptr, png_ptr->chunkdata);
+   png_ptr->chunkdata = NULL;
+   if (ret)
+     png_error(png_ptr, "Insufficient memory to store iTXt chunk.");
+}
+#endif
+
+/* This function is called when we haven't found a handler for a
+   chunk.  If there isn't a problem with the chunk itself (ie bad
+   chunk name, CRC, or a critical chunk), the chunk is silently ignored
+   -- unless the PNG_FLAG_UNKNOWN_CHUNKS_SUPPORTED flag is on in which
+   case it will be saved away to be written out later. */
+void /* PRIVATE */
+png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+{
+   png_uint_32 skip = 0;
+
+   png_debug(1, "in png_handle_unknown");
+
+#ifdef PNG_USER_LIMITS_SUPPORTED
+   if (png_ptr->user_chunk_cache_max != 0)
+   {
+      if (png_ptr->user_chunk_cache_max == 1)
+      {
+         png_crc_finish(png_ptr, length);
+         return;
+      }
+      if (--png_ptr->user_chunk_cache_max == 1)
+      {
+         png_warning(png_ptr, "No space in chunk cache for unknown chunk");
+         png_crc_finish(png_ptr, length);
+         return;
+      }
+   }
+#endif
+
+   if (png_ptr->mode & PNG_HAVE_IDAT)
+   {
+#ifdef PNG_USE_LOCAL_ARRAYS
+      PNG_CONST PNG_IDAT;
+#endif
+      if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))  /* Not an IDAT */
+         png_ptr->mode |= PNG_AFTER_IDAT;
+   }
+
+   if (!(png_ptr->chunk_name[0] & 0x20))
+   {
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+      if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
+           PNG_HANDLE_CHUNK_ALWAYS
+#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
+           && png_ptr->read_user_chunk_fn == NULL
+#endif
+        )
+#endif
+          png_chunk_error(png_ptr, "unknown critical chunk");
+   }
+
+#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
+   if ((png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS)
+#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
+       || (png_ptr->read_user_chunk_fn != NULL)
+#endif
+        )
+   {
+#ifdef PNG_MAX_MALLOC_64K
+       if (length > (png_uint_32)65535L)
+       {
+           png_warning(png_ptr, "unknown chunk too large to fit in memory");
+           skip = length - (png_uint_32)65535L;
+           length = (png_uint_32)65535L;
+       }
+#endif
+       png_memcpy((png_charp)png_ptr->unknown_chunk.name,
+                  (png_charp)png_ptr->chunk_name,
+                  png_sizeof(png_ptr->unknown_chunk.name));
+       png_ptr->unknown_chunk.name[png_sizeof(png_ptr->unknown_chunk.name)-1]
+           = '\0';
+       png_ptr->unknown_chunk.size = (png_size_t)length;
+       if (length == 0)
+         png_ptr->unknown_chunk.data = NULL;
+       else
+       {
+         png_ptr->unknown_chunk.data = (png_bytep)png_malloc(png_ptr, length);
+         png_crc_read(png_ptr, (png_bytep)png_ptr->unknown_chunk.data, length);
+       }
+#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
+       if (png_ptr->read_user_chunk_fn != NULL)
+       {
+          /* Callback to user unknown chunk handler */
+          int ret;
+          ret = (*(png_ptr->read_user_chunk_fn))
+            (png_ptr, &png_ptr->unknown_chunk);
+          if (ret < 0)
+             png_chunk_error(png_ptr, "error in user chunk");
+          if (ret == 0)
+          {
+             if (!(png_ptr->chunk_name[0] & 0x20))
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+                if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
+                     PNG_HANDLE_CHUNK_ALWAYS)
+#endif
+                   png_chunk_error(png_ptr, "unknown critical chunk");
+             png_set_unknown_chunks(png_ptr, info_ptr,
+               &png_ptr->unknown_chunk, 1);
+          }
+       }
+       else
+#endif
+       png_set_unknown_chunks(png_ptr, info_ptr, &png_ptr->unknown_chunk, 1);
+       png_free(png_ptr, png_ptr->unknown_chunk.data);
+       png_ptr->unknown_chunk.data = NULL;
+   }
+   else
+#endif
+      skip = length;
+
+   png_crc_finish(png_ptr, skip);
+
+#ifndef PNG_READ_USER_CHUNKS_SUPPORTED
+   info_ptr = info_ptr; /* Quiet compiler warnings about unused info_ptr */
+#endif
+}
+
+/* This function is called to verify that a chunk name is valid.
+   This function can't have the "critical chunk check" incorporated
+   into it, since in the future we will need to be able to call user
+   functions to handle unknown critical chunks after we check that
+   the chunk name itself is valid. */
+
+#define isnonalpha(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97))
+
+void /* PRIVATE */
+png_check_chunk_name(png_structp png_ptr, png_bytep chunk_name)
+{
+   png_debug(1, "in png_check_chunk_name");
+   if (isnonalpha(chunk_name[0]) || isnonalpha(chunk_name[1]) ||
+       isnonalpha(chunk_name[2]) || isnonalpha(chunk_name[3]))
+   {
+      png_chunk_error(png_ptr, "invalid chunk type");
+   }
+}
+
+/* Combines the row recently read in with the existing pixels in the
+   row.  This routine takes care of alpha and transparency if requested.
+   This routine also handles the two methods of progressive display
+   of interlaced images, depending on the mask value.
+   The mask value describes which pixels are to be combined with
+   the row.  The pattern always repeats every 8 pixels, so just 8
+   bits are needed.  A one indicates the pixel is to be combined,
+   a zero indicates the pixel is to be skipped.  This is in addition
+   to any alpha or transparency value associated with the pixel.  If
+   you want all pixels to be combined, pass 0xff (255) in mask.  */
+
+void /* PRIVATE */
+png_combine_row(png_structp png_ptr, png_bytep row, int mask)
+{
+   png_debug(1, "in png_combine_row");
+   if (mask == 0xff)
+   {
+      png_memcpy(row, png_ptr->row_buf + 1,
+         PNG_ROWBYTES(png_ptr->row_info.pixel_depth, png_ptr->width));
+   }
+   else
+   {
+      switch (png_ptr->row_info.pixel_depth)
+      {
+         case 1:
+         {
+            png_bytep sp = png_ptr->row_buf + 1;
+            png_bytep dp = row;
+            int s_inc, s_start, s_end;
+            int m = 0x80;
+            int shift;
+            png_uint_32 i;
+            png_uint_32 row_width = png_ptr->width;
+
+#ifdef PNG_READ_PACKSWAP_SUPPORTED
+            if (png_ptr->transformations & PNG_PACKSWAP)
+            {
+                s_start = 0;
+                s_end = 7;
+                s_inc = 1;
+            }
+            else
+#endif
+            {
+                s_start = 7;
+                s_end = 0;
+                s_inc = -1;
+            }
+
+            shift = s_start;
+
+            for (i = 0; i < row_width; i++)
+            {
+               if (m & mask)
+               {
+                  int value;
+
+                  value = (*sp >> shift) & 0x01;
+                  *dp &= (png_byte)((0x7f7f >> (7 - shift)) & 0xff);
+                  *dp |= (png_byte)(value << shift);
+               }
+
+               if (shift == s_end)
+               {
+                  shift = s_start;
+                  sp++;
+                  dp++;
+               }
+               else
+                  shift += s_inc;
+
+               if (m == 1)
+                  m = 0x80;
+               else
+                  m >>= 1;
+            }
+            break;
+         }
+         case 2:
+         {
+            png_bytep sp = png_ptr->row_buf + 1;
+            png_bytep dp = row;
+            int s_start, s_end, s_inc;
+            int m = 0x80;
+            int shift;
+            png_uint_32 i;
+            png_uint_32 row_width = png_ptr->width;
+            int value;
+
+#ifdef PNG_READ_PACKSWAP_SUPPORTED
+            if (png_ptr->transformations & PNG_PACKSWAP)
+            {
+               s_start = 0;
+               s_end = 6;
+               s_inc = 2;
+            }
+            else
+#endif
+            {
+               s_start = 6;
+               s_end = 0;
+               s_inc = -2;
+            }
+
+            shift = s_start;
+
+            for (i = 0; i < row_width; i++)
+            {
+               if (m & mask)
+               {
+                  value = (*sp >> shift) & 0x03;
+                  *dp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff);
+                  *dp |= (png_byte)(value << shift);
+               }
+
+               if (shift == s_end)
+               {
+                  shift = s_start;
+                  sp++;
+                  dp++;
+               }
+               else
+                  shift += s_inc;
+               if (m == 1)
+                  m = 0x80;
+               else
+                  m >>= 1;
+            }
+            break;
+         }
+         case 4:
+         {
+            png_bytep sp = png_ptr->row_buf + 1;
+            png_bytep dp = row;
+            int s_start, s_end, s_inc;
+            int m = 0x80;
+            int shift;
+            png_uint_32 i;
+            png_uint_32 row_width = png_ptr->width;
+            int value;
+
+#ifdef PNG_READ_PACKSWAP_SUPPORTED
+            if (png_ptr->transformations & PNG_PACKSWAP)
+            {
+               s_start = 0;
+               s_end = 4;
+               s_inc = 4;
+            }
+            else
+#endif
+            {
+               s_start = 4;
+               s_end = 0;
+               s_inc = -4;
+            }
+            shift = s_start;
+
+            for (i = 0; i < row_width; i++)
+            {
+               if (m & mask)
+               {
+                  value = (*sp >> shift) & 0xf;
+                  *dp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff);
+                  *dp |= (png_byte)(value << shift);
+               }
+
+               if (shift == s_end)
+               {
+                  shift = s_start;
+                  sp++;
+                  dp++;
+               }
+               else
+                  shift += s_inc;
+               if (m == 1)
+                  m = 0x80;
+               else
+                  m >>= 1;
+            }
+            break;
+         }
+         default:
+         {
+            png_bytep sp = png_ptr->row_buf + 1;
+            png_bytep dp = row;
+            png_size_t pixel_bytes = (png_ptr->row_info.pixel_depth >> 3);
+            png_uint_32 i;
+            png_uint_32 row_width = png_ptr->width;
+            png_byte m = 0x80;
+
+
+            for (i = 0; i < row_width; i++)
+            {
+               if (m & mask)
+               {
+                  png_memcpy(dp, sp, pixel_bytes);
+               }
+
+               sp += pixel_bytes;
+               dp += pixel_bytes;
+
+               if (m == 1)
+                  m = 0x80;
+               else
+                  m >>= 1;
+            }
+            break;
+         }
+      }
+   }
+}
+
+#ifdef PNG_READ_INTERLACING_SUPPORTED
+/* OLD pre-1.0.9 interface:
+void png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
+   png_uint_32 transformations)
+ */
+void /* PRIVATE */
+png_do_read_interlace(png_structp png_ptr)
+{
+   png_row_infop row_info = &(png_ptr->row_info);
+   png_bytep row = png_ptr->row_buf + 1;
+   int pass = png_ptr->pass;
+   png_uint_32 transformations = png_ptr->transformations;
+   /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+   /* Offset to next interlace block */
+   PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
+
+   png_debug(1, "in png_do_read_interlace");
+   if (row != NULL && row_info != NULL)
+   {
+      png_uint_32 final_width;
+
+      final_width = row_info->width * png_pass_inc[pass];
+
+      switch (row_info->pixel_depth)
+      {
+         case 1:
+         {
+            png_bytep sp = row + (png_size_t)((row_info->width - 1) >> 3);
+            png_bytep dp = row + (png_size_t)((final_width - 1) >> 3);
+            int sshift, dshift;
+            int s_start, s_end, s_inc;
+            int jstop = png_pass_inc[pass];
+            png_byte v;
+            png_uint_32 i;
+            int j;
+
+#ifdef PNG_READ_PACKSWAP_SUPPORTED
+            if (transformations & PNG_PACKSWAP)
+            {
+                sshift = (int)((row_info->width + 7) & 0x07);
+                dshift = (int)((final_width + 7) & 0x07);
+                s_start = 7;
+                s_end = 0;
+                s_inc = -1;
+            }
+            else
+#endif
+            {
+                sshift = 7 - (int)((row_info->width + 7) & 0x07);
+                dshift = 7 - (int)((final_width + 7) & 0x07);
+                s_start = 0;
+                s_end = 7;
+                s_inc = 1;
+            }
+
+            for (i = 0; i < row_info->width; i++)
+            {
+               v = (png_byte)((*sp >> sshift) & 0x01);
+               for (j = 0; j < jstop; j++)
+               {
+                  *dp &= (png_byte)((0x7f7f >> (7 - dshift)) & 0xff);
+                  *dp |= (png_byte)(v << dshift);
+                  if (dshift == s_end)
+                  {
+                     dshift = s_start;
+                     dp--;
+                  }
+                  else
+                     dshift += s_inc;
+               }
+               if (sshift == s_end)
+               {
+                  sshift = s_start;
+                  sp--;
+               }
+               else
+                  sshift += s_inc;
+            }
+            break;
+         }
+         case 2:
+         {
+            png_bytep sp = row + (png_uint_32)((row_info->width - 1) >> 2);
+            png_bytep dp = row + (png_uint_32)((final_width - 1) >> 2);
+            int sshift, dshift;
+            int s_start, s_end, s_inc;
+            int jstop = png_pass_inc[pass];
+            png_uint_32 i;
+
+#ifdef PNG_READ_PACKSWAP_SUPPORTED
+            if (transformations & PNG_PACKSWAP)
+            {
+               sshift = (int)(((row_info->width + 3) & 0x03) << 1);
+               dshift = (int)(((final_width + 3) & 0x03) << 1);
+               s_start = 6;
+               s_end = 0;
+               s_inc = -2;
+            }
+            else
+#endif
+            {
+               sshift = (int)((3 - ((row_info->width + 3) & 0x03)) << 1);
+               dshift = (int)((3 - ((final_width + 3) & 0x03)) << 1);
+               s_start = 0;
+               s_end = 6;
+               s_inc = 2;
+            }
+
+            for (i = 0; i < row_info->width; i++)
+            {
+               png_byte v;
+               int j;
+
+               v = (png_byte)((*sp >> sshift) & 0x03);
+               for (j = 0; j < jstop; j++)
+               {
+                  *dp &= (png_byte)((0x3f3f >> (6 - dshift)) & 0xff);
+                  *dp |= (png_byte)(v << dshift);
+                  if (dshift == s_end)
+                  {
+                     dshift = s_start;
+                     dp--;
+                  }
+                  else
+                     dshift += s_inc;
+               }
+               if (sshift == s_end)
+               {
+                  sshift = s_start;
+                  sp--;
+               }
+               else
+                  sshift += s_inc;
+            }
+            break;
+         }
+         case 4:
+         {
+            png_bytep sp = row + (png_size_t)((row_info->width - 1) >> 1);
+            png_bytep dp = row + (png_size_t)((final_width - 1) >> 1);
+            int sshift, dshift;
+            int s_start, s_end, s_inc;
+            png_uint_32 i;
+            int jstop = png_pass_inc[pass];
+
+#ifdef PNG_READ_PACKSWAP_SUPPORTED
+            if (transformations & PNG_PACKSWAP)
+            {
+               sshift = (int)(((row_info->width + 1) & 0x01) << 2);
+               dshift = (int)(((final_width + 1) & 0x01) << 2);
+               s_start = 4;
+               s_end = 0;
+               s_inc = -4;
+            }
+            else
+#endif
+            {
+               sshift = (int)((1 - ((row_info->width + 1) & 0x01)) << 2);
+               dshift = (int)((1 - ((final_width + 1) & 0x01)) << 2);
+               s_start = 0;
+               s_end = 4;
+               s_inc = 4;
+            }
+
+            for (i = 0; i < row_info->width; i++)
+            {
+               png_byte v = (png_byte)((*sp >> sshift) & 0xf);
+               int j;
+
+               for (j = 0; j < jstop; j++)
+               {
+                  *dp &= (png_byte)((0xf0f >> (4 - dshift)) & 0xff);
+                  *dp |= (png_byte)(v << dshift);
+                  if (dshift == s_end)
+                  {
+                     dshift = s_start;
+                     dp--;
+                  }
+                  else
+                     dshift += s_inc;
+               }
+               if (sshift == s_end)
+               {
+                  sshift = s_start;
+                  sp--;
+               }
+               else
+                  sshift += s_inc;
+            }
+            break;
+         }
+         default:
+         {
+            png_size_t pixel_bytes = (row_info->pixel_depth >> 3);
+            png_bytep sp = row + (png_size_t)(row_info->width - 1)
+                * pixel_bytes;
+            png_bytep dp = row + (png_size_t)(final_width - 1) * pixel_bytes;
+
+            int jstop = png_pass_inc[pass];
+            png_uint_32 i;
+
+            for (i = 0; i < row_info->width; i++)
+            {
+               png_byte v[8];
+               int j;
+
+               png_memcpy(v, sp, pixel_bytes);
+               for (j = 0; j < jstop; j++)
+               {
+                  png_memcpy(dp, v, pixel_bytes);
+                  dp -= pixel_bytes;
+               }
+               sp -= pixel_bytes;
+            }
+            break;
+         }
+      }
+      row_info->width = final_width;
+      row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, final_width);
+   }
+#ifndef PNG_READ_PACKSWAP_SUPPORTED
+   transformations = transformations; /* Silence compiler warning */
+#endif
+}
+#endif /* PNG_READ_INTERLACING_SUPPORTED */
+
+void /* PRIVATE */
+png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep row,
+   png_bytep prev_row, int filter)
+{
+   png_debug(1, "in png_read_filter_row");
+   png_debug2(2, "row = %lu, filter = %d", png_ptr->row_number, filter);
+   switch (filter)
+   {
+      case PNG_FILTER_VALUE_NONE:
+         break;
+      case PNG_FILTER_VALUE_SUB:
+      {
+         png_uint_32 i;
+         png_uint_32 istop = row_info->rowbytes;
+         png_uint_32 bpp = (row_info->pixel_depth + 7) >> 3;
+         png_bytep rp = row + bpp;
+         png_bytep lp = row;
+
+         for (i = bpp; i < istop; i++)
+         {
+            *rp = (png_byte)(((int)(*rp) + (int)(*lp++)) & 0xff);
+            rp++;
+         }
+         break;
+      }
+      case PNG_FILTER_VALUE_UP:
+      {
+         png_uint_32 i;
+         png_uint_32 istop = row_info->rowbytes;
+         png_bytep rp = row;
+         png_bytep pp = prev_row;
+
+         for (i = 0; i < istop; i++)
+         {
+            *rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff);
+            rp++;
+         }
+         break;
+      }
+      case PNG_FILTER_VALUE_AVG:
+      {
+         png_uint_32 i;
+         png_bytep rp = row;
+         png_bytep pp = prev_row;
+         png_bytep lp = row;
+         png_uint_32 bpp = (row_info->pixel_depth + 7) >> 3;
+         png_uint_32 istop = row_info->rowbytes - bpp;
+
+         for (i = 0; i < bpp; i++)
+         {
+            *rp = (png_byte)(((int)(*rp) +
+               ((int)(*pp++) / 2 )) & 0xff);
+            rp++;
+         }
+
+         for (i = 0; i < istop; i++)
+         {
+            *rp = (png_byte)(((int)(*rp) +
+               (int)(*pp++ + *lp++) / 2 ) & 0xff);
+            rp++;
+         }
+         break;
+      }
+      case PNG_FILTER_VALUE_PAETH:
+      {
+         png_uint_32 i;
+         png_bytep rp = row;
+         png_bytep pp = prev_row;
+         png_bytep lp = row;
+         png_bytep cp = prev_row;
+         png_uint_32 bpp = (row_info->pixel_depth + 7) >> 3;
+         png_uint_32 istop=row_info->rowbytes - bpp;
+
+         for (i = 0; i < bpp; i++)
+         {
+            *rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff);
+            rp++;
+         }
+
+         for (i = 0; i < istop; i++)   /* Use leftover rp,pp */
+         {
+            int a, b, c, pa, pb, pc, p;
+
+            a = *lp++;
+            b = *pp++;
+            c = *cp++;
+
+            p = b - c;
+            pc = a - c;
+
+#ifdef PNG_USE_ABS
+            pa = abs(p);
+            pb = abs(pc);
+            pc = abs(p + pc);
+#else
+            pa = p < 0 ? -p : p;
+            pb = pc < 0 ? -pc : pc;
+            pc = (p + pc) < 0 ? -(p + pc) : p + pc;
+#endif
+
+            /*
+               if (pa <= pb && pa <= pc)
+                  p = a;
+               else if (pb <= pc)
+                  p = b;
+               else
+                  p = c;
+             */
+
+            p = (pa <= pb && pa <= pc) ? a : (pb <= pc) ? b : c;
+
+            *rp = (png_byte)(((int)(*rp) + p) & 0xff);
+            rp++;
+         }
+         break;
+      }
+      default:
+         png_warning(png_ptr, "Ignoring bad adaptive filter type");
+         *row = 0;
+         break;
+   }
+}
+
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
+void /* PRIVATE */
+png_read_finish_row(png_structp png_ptr)
+{
+#ifdef PNG_READ_INTERLACING_SUPPORTED
+   /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+
+   /* Start of interlace block */
+   PNG_CONST int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
+
+   /* Offset to next interlace block */
+   PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
+
+   /* Start of interlace block in the y direction */
+   PNG_CONST int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
+
+   /* Offset to next interlace block in the y direction */
+   PNG_CONST int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
+#endif /* PNG_READ_INTERLACING_SUPPORTED */
+
+   png_debug(1, "in png_read_finish_row");
+   png_ptr->row_number++;
+   if (png_ptr->row_number < png_ptr->num_rows)
+      return;
+
+#ifdef PNG_READ_INTERLACING_SUPPORTED
+   if (png_ptr->interlaced)
+   {
+      png_ptr->row_number = 0;
+      png_memset_check(png_ptr, png_ptr->prev_row, 0,
+         png_ptr->rowbytes + 1);
+      do
+      {
+         png_ptr->pass++;
+         if (png_ptr->pass >= 7)
+            break;
+         png_ptr->iwidth = (png_ptr->width +
+            png_pass_inc[png_ptr->pass] - 1 -
+            png_pass_start[png_ptr->pass]) /
+            png_pass_inc[png_ptr->pass];
+
+         if (!(png_ptr->transformations & PNG_INTERLACE))
+         {
+            png_ptr->num_rows = (png_ptr->height +
+               png_pass_yinc[png_ptr->pass] - 1 -
+               png_pass_ystart[png_ptr->pass]) /
+               png_pass_yinc[png_ptr->pass];
+            if (!(png_ptr->num_rows))
+               continue;
+         }
+         else  /* if (png_ptr->transformations & PNG_INTERLACE) */
+            break;
+      } while (png_ptr->iwidth == 0);
+
+      if (png_ptr->pass < 7)
+         return;
+   }
+#endif /* PNG_READ_INTERLACING_SUPPORTED */
+
+   if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
+   {
+#ifdef PNG_USE_LOCAL_ARRAYS
+      PNG_CONST PNG_IDAT;
+#endif
+      char extra;
+      int ret;
+
+      png_ptr->zstream.next_out = (Byte *)&extra;
+      png_ptr->zstream.avail_out = (uInt)1;
+      for (;;)
+      {
+         if (!(png_ptr->zstream.avail_in))
+         {
+            while (!png_ptr->idat_size)
+            {
+               png_byte chunk_length[4];
+
+               png_crc_finish(png_ptr, 0);
+
+               png_read_data(png_ptr, chunk_length, 4);
+               png_ptr->idat_size = png_get_uint_31(png_ptr, chunk_length);
+               png_reset_crc(png_ptr);
+               png_crc_read(png_ptr, png_ptr->chunk_name, 4);
+               if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+                  png_error(png_ptr, "Not enough image data");
+
+            }
+            png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size;
+            png_ptr->zstream.next_in = png_ptr->zbuf;
+            if (png_ptr->zbuf_size > png_ptr->idat_size)
+               png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size;
+            png_crc_read(png_ptr, png_ptr->zbuf, png_ptr->zstream.avail_in);
+            png_ptr->idat_size -= png_ptr->zstream.avail_in;
+         }
+         ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
+         if (ret == Z_STREAM_END)
+         {
+            if (!(png_ptr->zstream.avail_out) || png_ptr->zstream.avail_in ||
+               png_ptr->idat_size)
+               png_warning(png_ptr, "Extra compressed data.");
+            png_ptr->mode |= PNG_AFTER_IDAT;
+            png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
+            break;
+         }
+         if (ret != Z_OK)
+            png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg :
+                      "Decompression Error");
+
+         if (!(png_ptr->zstream.avail_out))
+         {
+            png_warning(png_ptr, "Extra compressed data.");
+            png_ptr->mode |= PNG_AFTER_IDAT;
+            png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
+            break;
+         }
+
+      }
+      png_ptr->zstream.avail_out = 0;
+   }
+
+   if (png_ptr->idat_size || png_ptr->zstream.avail_in)
+      png_warning(png_ptr, "Extra compression data.");
+
+   inflateReset(&png_ptr->zstream);
+
+   png_ptr->mode |= PNG_AFTER_IDAT;
+}
+#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
+
+void /* PRIVATE */
+png_read_start_row(png_structp png_ptr)
+{
+#ifdef PNG_READ_INTERLACING_SUPPORTED
+   /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+
+   /* Start of interlace block */
+   PNG_CONST int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
+
+   /* Offset to next interlace block */
+   PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
+
+   /* Start of interlace block in the y direction */
+   PNG_CONST int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
+
+   /* Offset to next interlace block in the y direction */
+   PNG_CONST int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
+#endif
+
+   int max_pixel_depth;
+   png_size_t row_bytes;
+
+   png_debug(1, "in png_read_start_row");
+   png_ptr->zstream.avail_in = 0;
+   png_init_read_transformations(png_ptr);
+#ifdef PNG_READ_INTERLACING_SUPPORTED
+   if (png_ptr->interlaced)
+   {
+      if (!(png_ptr->transformations & PNG_INTERLACE))
+         png_ptr->num_rows = (png_ptr->height + png_pass_yinc[0] - 1 -
+            png_pass_ystart[0]) / png_pass_yinc[0];
+      else
+         png_ptr->num_rows = png_ptr->height;
+
+      png_ptr->iwidth = (png_ptr->width +
+         png_pass_inc[png_ptr->pass] - 1 -
+         png_pass_start[png_ptr->pass]) /
+         png_pass_inc[png_ptr->pass];
+   }
+   else
+#endif /* PNG_READ_INTERLACING_SUPPORTED */
+   {
+      png_ptr->num_rows = png_ptr->height;
+      png_ptr->iwidth = png_ptr->width;
+   }
+   max_pixel_depth = png_ptr->pixel_depth;
+
+#ifdef PNG_READ_PACK_SUPPORTED
+   if ((png_ptr->transformations & PNG_PACK) && png_ptr->bit_depth < 8)
+      max_pixel_depth = 8;
+#endif
+
+#ifdef PNG_READ_EXPAND_SUPPORTED
+   if (png_ptr->transformations & PNG_EXPAND)
+   {
+      if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
+      {
+         if (png_ptr->num_trans)
+            max_pixel_depth = 32;
+         else
+            max_pixel_depth = 24;
+      }
+      else if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY)
+      {
+         if (max_pixel_depth < 8)
+            max_pixel_depth = 8;
+         if (png_ptr->num_trans)
+            max_pixel_depth *= 2;
+      }
+      else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)
+      {
+         if (png_ptr->num_trans)
+         {
+            max_pixel_depth *= 4;
+            max_pixel_depth /= 3;
+         }
+      }
+   }
+#endif
+
+#ifdef PNG_READ_FILLER_SUPPORTED
+   if (png_ptr->transformations & (PNG_FILLER))
+   {
+      if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
+         max_pixel_depth = 32;
+      else if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY)
+      {
+         if (max_pixel_depth <= 8)
+            max_pixel_depth = 16;
+         else
+            max_pixel_depth = 32;
+      }
+      else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)
+      {
+         if (max_pixel_depth <= 32)
+            max_pixel_depth = 32;
+         else
+            max_pixel_depth = 64;
+      }
+   }
+#endif
+
+#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
+   if (png_ptr->transformations & PNG_GRAY_TO_RGB)
+   {
+      if (
+#ifdef PNG_READ_EXPAND_SUPPORTED
+        (png_ptr->num_trans && (png_ptr->transformations & PNG_EXPAND)) ||
+#endif
+#ifdef PNG_READ_FILLER_SUPPORTED
+        (png_ptr->transformations & (PNG_FILLER)) ||
+#endif
+        png_ptr->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
+      {
+         if (max_pixel_depth <= 16)
+            max_pixel_depth = 32;
+         else
+            max_pixel_depth = 64;
+      }
+      else
+      {
+         if (max_pixel_depth <= 8)
+           {
+             if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+               max_pixel_depth = 32;
+             else
+               max_pixel_depth = 24;
+           }
+         else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+            max_pixel_depth = 64;
+         else
+            max_pixel_depth = 48;
+      }
+   }
+#endif
+
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) && \
+defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
+   if (png_ptr->transformations & PNG_USER_TRANSFORM)
+     {
+       int user_pixel_depth = png_ptr->user_transform_depth*
+         png_ptr->user_transform_channels;
+       if (user_pixel_depth > max_pixel_depth)
+         max_pixel_depth=user_pixel_depth;
+     }
+#endif
+
+   /* Align the width on the next larger 8 pixels.  Mainly used
+    * for interlacing
+    */
+   row_bytes = ((png_ptr->width + 7) & ~((png_uint_32)7));
+   /* Calculate the maximum bytes needed, adding a byte and a pixel
+    * for safety's sake
+    */
+   row_bytes = PNG_ROWBYTES(max_pixel_depth, row_bytes) +
+      1 + ((max_pixel_depth + 7) >> 3);
+#ifdef PNG_MAX_MALLOC_64K
+   if (row_bytes > (png_uint_32)65536L)
+      png_error(png_ptr, "This image requires a row greater than 64KB");
+#endif
+
+   if (row_bytes + 64 > png_ptr->old_big_row_buf_size)
+   {
+     png_free(png_ptr, png_ptr->big_row_buf);
+     if (png_ptr->interlaced)
+        png_ptr->big_row_buf = (png_bytep)png_calloc(png_ptr,
+            row_bytes + 64);
+     else
+        png_ptr->big_row_buf = (png_bytep)png_malloc(png_ptr,
+            row_bytes + 64);
+     png_ptr->old_big_row_buf_size = row_bytes + 64;
+
+     /* Use 32 bytes of padding before and after row_buf. */
+     png_ptr->row_buf = png_ptr->big_row_buf + 32;
+     png_ptr->old_big_row_buf_size = row_bytes + 64;
+   }
+
+#ifdef PNG_MAX_MALLOC_64K
+   if ((png_uint_32)row_bytes + 1 > (png_uint_32)65536L)
+      png_error(png_ptr, "This image requires a row greater than 64KB");
+#endif
+   if ((png_uint_32)row_bytes > (png_uint_32)(PNG_SIZE_MAX - 1))
+      png_error(png_ptr, "Row has too many bytes to allocate in memory.");
+
+   if (row_bytes + 1 > png_ptr->old_prev_row_size)
+   {
+      png_free(png_ptr, png_ptr->prev_row);
+      png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, (png_uint_32)(
+        row_bytes + 1));
+      png_memset_check(png_ptr, png_ptr->prev_row, 0, row_bytes + 1);
+      png_ptr->old_prev_row_size = row_bytes + 1;
+   }
+
+   png_ptr->rowbytes = row_bytes;
+
+   png_debug1(3, "width = %lu,", png_ptr->width);
+   png_debug1(3, "height = %lu,", png_ptr->height);
+   png_debug1(3, "iwidth = %lu,", png_ptr->iwidth);
+   png_debug1(3, "num_rows = %lu,", png_ptr->num_rows);
+   png_debug1(3, "rowbytes = %lu,", png_ptr->rowbytes);
+   png_debug1(3, "irowbytes = %lu",
+       PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->iwidth) + 1);
+
+   png_ptr->flags |= PNG_FLAG_ROW_INIT;
+}
+#endif /* PNG_READ_SUPPORTED */
diff --git a/src/libpng/pngset.c b/src/libpng/pngset.c
new file mode 100644
index 0000000..717757f
--- /dev/null
+++ b/src/libpng/pngset.c
@@ -0,0 +1,1226 @@
+
+/* pngset.c - storage of image information into info struct
+ *
+ * Last changed in libpng 1.2.43 [February 25, 2010]
+ * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
+ * The functions here are used during reads to store data from the file
+ * into the info struct, and during writes to store application data
+ * into the info struct for writing into the file.  This abstracts the
+ * info struct and allows us to change the structure in the future.
+ */
+
+#define PNG_INTERNAL
+#define PNG_NO_PEDANTIC_WARNINGS
+#include "png.h"
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
+
+#ifdef PNG_bKGD_SUPPORTED
+void PNGAPI
+png_set_bKGD(png_structp png_ptr, png_infop info_ptr, png_color_16p background)
+{
+   png_debug1(1, "in %s storage function", "bKGD");
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   png_memcpy(&(info_ptr->background), background, png_sizeof(png_color_16));
+   info_ptr->valid |= PNG_INFO_bKGD;
+}
+#endif
+
+#ifdef PNG_cHRM_SUPPORTED
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+void PNGAPI
+png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
+   double white_x, double white_y, double red_x, double red_y,
+   double green_x, double green_y, double blue_x, double blue_y)
+{
+   png_debug1(1, "in %s storage function", "cHRM");
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   info_ptr->x_white = (float)white_x;
+   info_ptr->y_white = (float)white_y;
+   info_ptr->x_red   = (float)red_x;
+   info_ptr->y_red   = (float)red_y;
+   info_ptr->x_green = (float)green_x;
+   info_ptr->y_green = (float)green_y;
+   info_ptr->x_blue  = (float)blue_x;
+   info_ptr->y_blue  = (float)blue_y;
+#ifdef PNG_FIXED_POINT_SUPPORTED
+   info_ptr->int_x_white = (png_fixed_point)(white_x*100000.+0.5);
+   info_ptr->int_y_white = (png_fixed_point)(white_y*100000.+0.5);
+   info_ptr->int_x_red   = (png_fixed_point)(  red_x*100000.+0.5);
+   info_ptr->int_y_red   = (png_fixed_point)(  red_y*100000.+0.5);
+   info_ptr->int_x_green = (png_fixed_point)(green_x*100000.+0.5);
+   info_ptr->int_y_green = (png_fixed_point)(green_y*100000.+0.5);
+   info_ptr->int_x_blue  = (png_fixed_point)( blue_x*100000.+0.5);
+   info_ptr->int_y_blue  = (png_fixed_point)( blue_y*100000.+0.5);
+#endif
+   info_ptr->valid |= PNG_INFO_cHRM;
+}
+#endif /* PNG_FLOATING_POINT_SUPPORTED */
+
+#ifdef PNG_FIXED_POINT_SUPPORTED
+void PNGAPI
+png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
+   png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
+   png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
+   png_fixed_point blue_x, png_fixed_point blue_y)
+{
+   png_debug1(1, "in %s storage function", "cHRM fixed");
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+#ifdef PNG_CHECK_cHRM_SUPPORTED
+   if (png_check_cHRM_fixed(png_ptr,
+      white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y))
+#endif
+   {
+      info_ptr->int_x_white = white_x;
+      info_ptr->int_y_white = white_y;
+      info_ptr->int_x_red   = red_x;
+      info_ptr->int_y_red   = red_y;
+      info_ptr->int_x_green = green_x;
+      info_ptr->int_y_green = green_y;
+      info_ptr->int_x_blue  = blue_x;
+      info_ptr->int_y_blue  = blue_y;
+#ifdef  PNG_FLOATING_POINT_SUPPORTED
+      info_ptr->x_white = (float)(white_x/100000.);
+      info_ptr->y_white = (float)(white_y/100000.);
+      info_ptr->x_red   = (float)(  red_x/100000.);
+      info_ptr->y_red   = (float)(  red_y/100000.);
+      info_ptr->x_green = (float)(green_x/100000.);
+      info_ptr->y_green = (float)(green_y/100000.);
+      info_ptr->x_blue  = (float)( blue_x/100000.);
+      info_ptr->y_blue  = (float)( blue_y/100000.);
+#endif
+      info_ptr->valid |= PNG_INFO_cHRM;
+   }
+}
+#endif /* PNG_FIXED_POINT_SUPPORTED */
+#endif /* PNG_cHRM_SUPPORTED */
+
+#ifdef PNG_gAMA_SUPPORTED
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+void PNGAPI
+png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)
+{
+   double png_gamma;
+
+   png_debug1(1, "in %s storage function", "gAMA");
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   /* Check for overflow */
+   if (file_gamma > 21474.83)
+   {
+      png_warning(png_ptr, "Limiting gamma to 21474.83");
+      png_gamma=21474.83;
+   }
+   else
+      png_gamma = file_gamma;
+   info_ptr->gamma = (float)png_gamma;
+#ifdef PNG_FIXED_POINT_SUPPORTED
+   info_ptr->int_gamma = (int)(png_gamma*100000.+.5);
+#endif
+   info_ptr->valid |= PNG_INFO_gAMA;
+   if (png_gamma == 0.0)
+      png_warning(png_ptr, "Setting gamma=0");
+}
+#endif
+void PNGAPI
+png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point
+   int_gamma)
+{
+   png_fixed_point png_gamma;
+
+   png_debug1(1, "in %s storage function", "gAMA");
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   if (int_gamma > (png_fixed_point)PNG_UINT_31_MAX)
+   {
+      png_warning(png_ptr, "Limiting gamma to 21474.83");
+      png_gamma=PNG_UINT_31_MAX;
+   }
+   else
+   {
+      if (int_gamma < 0)
+      {
+         png_warning(png_ptr, "Setting negative gamma to zero");
+         png_gamma = 0;
+      }
+      else
+         png_gamma = int_gamma;
+   }
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+   info_ptr->gamma = (float)(png_gamma/100000.);
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+   info_ptr->int_gamma = png_gamma;
+#endif
+   info_ptr->valid |= PNG_INFO_gAMA;
+   if (png_gamma == 0)
+      png_warning(png_ptr, "Setting gamma=0");
+}
+#endif
+
+#ifdef PNG_hIST_SUPPORTED
+void PNGAPI
+png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)
+{
+   int i;
+
+   png_debug1(1, "in %s storage function", "hIST");
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   if (info_ptr->num_palette == 0 || info_ptr->num_palette
+       > PNG_MAX_PALETTE_LENGTH)
+   {
+      png_warning(png_ptr,
+         "Invalid palette size, hIST allocation skipped.");
+      return;
+   }
+
+#ifdef PNG_FREE_ME_SUPPORTED
+   png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
+#endif
+   /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in
+    * version 1.2.1
+    */
+   png_ptr->hist = (png_uint_16p)png_malloc_warn(png_ptr,
+      (png_uint_32)(PNG_MAX_PALETTE_LENGTH * png_sizeof(png_uint_16)));
+   if (png_ptr->hist == NULL)
+   {
+      png_warning(png_ptr, "Insufficient memory for hIST chunk data.");
+      return;
+   }
+
+   for (i = 0; i < info_ptr->num_palette; i++)
+      png_ptr->hist[i] = hist[i];
+   info_ptr->hist = png_ptr->hist;
+   info_ptr->valid |= PNG_INFO_hIST;
+
+#ifdef PNG_FREE_ME_SUPPORTED
+   info_ptr->free_me |= PNG_FREE_HIST;
+#else
+   png_ptr->flags |= PNG_FLAG_FREE_HIST;
+#endif
+}
+#endif
+
+void PNGAPI
+png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
+   png_uint_32 width, png_uint_32 height, int bit_depth,
+   int color_type, int interlace_type, int compression_type,
+   int filter_type)
+{
+   png_debug1(1, "in %s storage function", "IHDR");
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   info_ptr->width = width;
+   info_ptr->height = height;
+   info_ptr->bit_depth = (png_byte)bit_depth;
+   info_ptr->color_type = (png_byte)color_type;
+   info_ptr->compression_type = (png_byte)compression_type;
+   info_ptr->filter_type = (png_byte)filter_type;
+   info_ptr->interlace_type = (png_byte)interlace_type;
+
+   png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height,
+       info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,
+       info_ptr->compression_type, info_ptr->filter_type);
+
+   if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
+      info_ptr->channels = 1;
+   else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR)
+      info_ptr->channels = 3;
+   else
+      info_ptr->channels = 1;
+   if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA)
+      info_ptr->channels++;
+   info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
+
+   /* Check for potential overflow */
+   if (width > (PNG_UINT_32_MAX
+                 >> 3)      /* 8-byte RGBA pixels */
+                 - 64       /* bigrowbuf hack */
+                 - 1        /* filter byte */
+                 - 7*8      /* rounding of width to multiple of 8 pixels */
+                 - 8)       /* extra max_pixel_depth pad */
+      info_ptr->rowbytes = (png_size_t)0;
+   else
+      info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width);
+}
+
+#ifdef PNG_oFFs_SUPPORTED
+void PNGAPI
+png_set_oFFs(png_structp png_ptr, png_infop info_ptr,
+   png_int_32 offset_x, png_int_32 offset_y, int unit_type)
+{
+   png_debug1(1, "in %s storage function", "oFFs");
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   info_ptr->x_offset = offset_x;
+   info_ptr->y_offset = offset_y;
+   info_ptr->offset_unit_type = (png_byte)unit_type;
+   info_ptr->valid |= PNG_INFO_oFFs;
+}
+#endif
+
+#ifdef PNG_pCAL_SUPPORTED
+void PNGAPI
+png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
+   png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
+   png_charp units, png_charpp params)
+{
+   png_uint_32 length;
+   int i;
+
+   png_debug1(1, "in %s storage function", "pCAL");
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   length = png_strlen(purpose) + 1;
+   png_debug1(3, "allocating purpose for info (%lu bytes)",
+     (unsigned long)length);
+   info_ptr->pcal_purpose = (png_charp)png_malloc_warn(png_ptr, length);
+   if (info_ptr->pcal_purpose == NULL)
+   {
+      png_warning(png_ptr, "Insufficient memory for pCAL purpose.");
+      return;
+   }
+   png_memcpy(info_ptr->pcal_purpose, purpose, (png_size_t)length);
+
+   png_debug(3, "storing X0, X1, type, and nparams in info");
+   info_ptr->pcal_X0 = X0;
+   info_ptr->pcal_X1 = X1;
+   info_ptr->pcal_type = (png_byte)type;
+   info_ptr->pcal_nparams = (png_byte)nparams;
+
+   length = png_strlen(units) + 1;
+   png_debug1(3, "allocating units for info (%lu bytes)",
+     (unsigned long)length);
+   info_ptr->pcal_units = (png_charp)png_malloc_warn(png_ptr, length);
+   if (info_ptr->pcal_units == NULL)
+   {
+      png_warning(png_ptr, "Insufficient memory for pCAL units.");
+      return;
+   }
+   png_memcpy(info_ptr->pcal_units, units, (png_size_t)length);
+
+   info_ptr->pcal_params = (png_charpp)png_malloc_warn(png_ptr,
+      (png_uint_32)((nparams + 1) * png_sizeof(png_charp)));
+   if (info_ptr->pcal_params == NULL)
+   {
+      png_warning(png_ptr, "Insufficient memory for pCAL params.");
+      return;
+   }
+
+   png_memset(info_ptr->pcal_params, 0, (nparams + 1) * png_sizeof(png_charp));
+
+   for (i = 0; i < nparams; i++)
+   {
+      length = png_strlen(params[i]) + 1;
+      png_debug2(3, "allocating parameter %d for info (%lu bytes)", i,
+        (unsigned long)length);
+      info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length);
+      if (info_ptr->pcal_params[i] == NULL)
+      {
+         png_warning(png_ptr, "Insufficient memory for pCAL parameter.");
+         return;
+      }
+      png_memcpy(info_ptr->pcal_params[i], params[i], (png_size_t)length);
+   }
+
+   info_ptr->valid |= PNG_INFO_pCAL;
+#ifdef PNG_FREE_ME_SUPPORTED
+   info_ptr->free_me |= PNG_FREE_PCAL;
+#endif
+}
+#endif
+
+#if defined(PNG_READ_sCAL_SUPPORTED) || defined(PNG_WRITE_sCAL_SUPPORTED)
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+void PNGAPI
+png_set_sCAL(png_structp png_ptr, png_infop info_ptr,
+             int unit, double width, double height)
+{
+   png_debug1(1, "in %s storage function", "sCAL");
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   info_ptr->scal_unit = (png_byte)unit;
+   info_ptr->scal_pixel_width = width;
+   info_ptr->scal_pixel_height = height;
+
+   info_ptr->valid |= PNG_INFO_sCAL;
+}
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+void PNGAPI
+png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
+             int unit, png_charp swidth, png_charp sheight)
+{
+   png_uint_32 length;
+
+   png_debug1(1, "in %s storage function", "sCAL");
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   info_ptr->scal_unit = (png_byte)unit;
+
+   length = png_strlen(swidth) + 1;
+   png_debug1(3, "allocating unit for info (%u bytes)",
+      (unsigned int)length);
+   info_ptr->scal_s_width = (png_charp)png_malloc_warn(png_ptr, length);
+   if (info_ptr->scal_s_width == NULL)
+   {
+      png_warning(png_ptr,
+         "Memory allocation failed while processing sCAL.");
+      return;
+   }
+   png_memcpy(info_ptr->scal_s_width, swidth, (png_size_t)length);
+
+   length = png_strlen(sheight) + 1;
+   png_debug1(3, "allocating unit for info (%u bytes)",
+      (unsigned int)length);
+   info_ptr->scal_s_height = (png_charp)png_malloc_warn(png_ptr, length);
+   if (info_ptr->scal_s_height == NULL)
+   {
+      png_free (png_ptr, info_ptr->scal_s_width);
+      info_ptr->scal_s_width = NULL;
+      png_warning(png_ptr,
+         "Memory allocation failed while processing sCAL.");
+      return;
+   }
+   png_memcpy(info_ptr->scal_s_height, sheight, (png_size_t)length);
+   info_ptr->valid |= PNG_INFO_sCAL;
+#ifdef PNG_FREE_ME_SUPPORTED
+   info_ptr->free_me |= PNG_FREE_SCAL;
+#endif
+}
+#endif
+#endif
+#endif
+
+#ifdef PNG_pHYs_SUPPORTED
+void PNGAPI
+png_set_pHYs(png_structp png_ptr, png_infop info_ptr,
+   png_uint_32 res_x, png_uint_32 res_y, int unit_type)
+{
+   png_debug1(1, "in %s storage function", "pHYs");
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   info_ptr->x_pixels_per_unit = res_x;
+   info_ptr->y_pixels_per_unit = res_y;
+   info_ptr->phys_unit_type = (png_byte)unit_type;
+   info_ptr->valid |= PNG_INFO_pHYs;
+}
+#endif
+
+void PNGAPI
+png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
+   png_colorp palette, int num_palette)
+{
+
+   png_debug1(1, "in %s storage function", "PLTE");
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   if (num_palette < 0 || num_palette > PNG_MAX_PALETTE_LENGTH)
+   {
+      if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
+         png_error(png_ptr, "Invalid palette length");
+      else
+      {
+         png_warning(png_ptr, "Invalid palette length");
+         return;
+      }
+   }
+
+   /* It may not actually be necessary to set png_ptr->palette here;
+    * we do it for backward compatibility with the way the png_handle_tRNS
+    * function used to do the allocation.
+    */
+#ifdef PNG_FREE_ME_SUPPORTED
+   png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
+#endif
+
+   /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead
+    * of num_palette entries, in case of an invalid PNG file that has
+    * too-large sample values.
+    */
+   png_ptr->palette = (png_colorp)png_calloc(png_ptr,
+      PNG_MAX_PALETTE_LENGTH * png_sizeof(png_color));
+   png_memcpy(png_ptr->palette, palette, num_palette * png_sizeof(png_color));
+   info_ptr->palette = png_ptr->palette;
+   info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
+
+#ifdef PNG_FREE_ME_SUPPORTED
+   info_ptr->free_me |= PNG_FREE_PLTE;
+#else
+   png_ptr->flags |= PNG_FLAG_FREE_PLTE;
+#endif
+
+   info_ptr->valid |= PNG_INFO_PLTE;
+}
+
+#ifdef PNG_sBIT_SUPPORTED
+void PNGAPI
+png_set_sBIT(png_structp png_ptr, png_infop info_ptr,
+   png_color_8p sig_bit)
+{
+   png_debug1(1, "in %s storage function", "sBIT");
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   png_memcpy(&(info_ptr->sig_bit), sig_bit, png_sizeof(png_color_8));
+   info_ptr->valid |= PNG_INFO_sBIT;
+}
+#endif
+
+#ifdef PNG_sRGB_SUPPORTED
+void PNGAPI
+png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int intent)
+{
+   png_debug1(1, "in %s storage function", "sRGB");
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   info_ptr->srgb_intent = (png_byte)intent;
+   info_ptr->valid |= PNG_INFO_sRGB;
+}
+
+void PNGAPI
+png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
+   int intent)
+{
+#ifdef PNG_gAMA_SUPPORTED
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+   float file_gamma;
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+   png_fixed_point int_file_gamma;
+#endif
+#endif
+#ifdef PNG_cHRM_SUPPORTED
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+   float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
+#endif
+   png_fixed_point int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
+      int_green_y, int_blue_x, int_blue_y;
+#endif
+   png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM");
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   png_set_sRGB(png_ptr, info_ptr, intent);
+
+#ifdef PNG_gAMA_SUPPORTED
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+   file_gamma = (float).45455;
+   png_set_gAMA(png_ptr, info_ptr, file_gamma);
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+   int_file_gamma = 45455L;
+   png_set_gAMA_fixed(png_ptr, info_ptr, int_file_gamma);
+#endif
+#endif
+
+#ifdef PNG_cHRM_SUPPORTED
+   int_white_x = 31270L;
+   int_white_y = 32900L;
+   int_red_x   = 64000L;
+   int_red_y   = 33000L;
+   int_green_x = 30000L;
+   int_green_y = 60000L;
+   int_blue_x  = 15000L;
+   int_blue_y  =  6000L;
+
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+   white_x = (float).3127;
+   white_y = (float).3290;
+   red_x   = (float).64;
+   red_y   = (float).33;
+   green_x = (float).30;
+   green_y = (float).60;
+   blue_x  = (float).15;
+   blue_y  = (float).06;
+#endif
+
+#ifdef PNG_FIXED_POINT_SUPPORTED
+   png_set_cHRM_fixed(png_ptr, info_ptr,
+       int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
+       int_green_y, int_blue_x, int_blue_y);
+#endif
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+   png_set_cHRM(png_ptr, info_ptr,
+       white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);
+#endif
+#endif /* cHRM */
+}
+#endif /* sRGB */
+
+
+#ifdef PNG_iCCP_SUPPORTED
+void PNGAPI
+png_set_iCCP(png_structp png_ptr, png_infop info_ptr,
+             png_charp name, int compression_type,
+             png_charp profile, png_uint_32 proflen)
+{
+   png_charp new_iccp_name;
+   png_charp new_iccp_profile;
+   png_uint_32 length;
+
+   png_debug1(1, "in %s storage function", "iCCP");
+
+   if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
+      return;
+
+   length = png_strlen(name)+1;
+   new_iccp_name = (png_charp)png_malloc_warn(png_ptr, length);
+   if (new_iccp_name == NULL)
+   {
+        png_warning(png_ptr, "Insufficient memory to process iCCP chunk.");
+      return;
+   }
+   png_memcpy(new_iccp_name, name, length);
+   new_iccp_profile = (png_charp)png_malloc_warn(png_ptr, proflen);
+   if (new_iccp_profile == NULL)
+   {
+      png_free (png_ptr, new_iccp_name);
+      png_warning(png_ptr,
+          "Insufficient memory to process iCCP profile.");
+      return;
+   }
+   png_memcpy(new_iccp_profile, profile, (png_size_t)proflen);
+
+   png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
+
+   info_ptr->iccp_proflen = proflen;
+   info_ptr->iccp_name = new_iccp_name;
+   info_ptr->iccp_profile = new_iccp_profile;
+   /* Compression is always zero but is here so the API and info structure
+    * does not have to change if we introduce multiple compression types
+    */
+   info_ptr->iccp_compression = (png_byte)compression_type;
+#ifdef PNG_FREE_ME_SUPPORTED
+   info_ptr->free_me |= PNG_FREE_ICCP;
+#endif
+   info_ptr->valid |= PNG_INFO_iCCP;
+}
+#endif
+
+#ifdef PNG_TEXT_SUPPORTED
+void PNGAPI
+png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
+             int num_text)
+{
+   int ret;
+   ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
+   if (ret)
+      png_error(png_ptr, "Insufficient memory to store text");
+}
+
+int /* PRIVATE */
+png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
+               int num_text)
+{
+   int i;
+
+   png_debug1(1, "in %s storage function", ((png_ptr == NULL ||
+      png_ptr->chunk_name[0] == '\0') ?
+      "text" : (png_const_charp)png_ptr->chunk_name));
+
+   if (png_ptr == NULL || info_ptr == NULL || num_text == 0)
+      return(0);
+
+   /* Make sure we have enough space in the "text" array in info_struct
+    * to hold all of the incoming text_ptr objects.
+    */
+   if (info_ptr->num_text + num_text > info_ptr->max_text)
+   {
+      if (info_ptr->text != NULL)
+      {
+         png_textp old_text;
+         int old_max;
+
+         old_max = info_ptr->max_text;
+         info_ptr->max_text = info_ptr->num_text + num_text + 8;
+         old_text = info_ptr->text;
+         info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
+            (png_uint_32)(info_ptr->max_text * png_sizeof(png_text)));
+         if (info_ptr->text == NULL)
+         {
+            png_free(png_ptr, old_text);
+            return(1);
+         }
+         png_memcpy(info_ptr->text, old_text, (png_size_t)(old_max *
+            png_sizeof(png_text)));
+         png_free(png_ptr, old_text);
+      }
+      else
+      {
+         info_ptr->max_text = num_text + 8;
+         info_ptr->num_text = 0;
+         info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
+            (png_uint_32)(info_ptr->max_text * png_sizeof(png_text)));
+         if (info_ptr->text == NULL)
+            return(1);
+#ifdef PNG_FREE_ME_SUPPORTED
+         info_ptr->free_me |= PNG_FREE_TEXT;
+#endif
+      }
+      png_debug1(3, "allocated %d entries for info_ptr->text",
+         info_ptr->max_text);
+   }
+   for (i = 0; i < num_text; i++)
+   {
+      png_size_t text_length, key_len;
+      png_size_t lang_len, lang_key_len;
+      png_textp textp = &(info_ptr->text[info_ptr->num_text]);
+
+      if (text_ptr[i].key == NULL)
+          continue;
+
+      key_len = png_strlen(text_ptr[i].key);
+
+      if (text_ptr[i].compression <= 0)
+      {
+         lang_len = 0;
+         lang_key_len = 0;
+      }
+
+      else
+#ifdef PNG_iTXt_SUPPORTED
+      {
+         /* Set iTXt data */
+
+         if (text_ptr[i].lang != NULL)
+            lang_len = png_strlen(text_ptr[i].lang);
+         else
+            lang_len = 0;
+         if (text_ptr[i].lang_key != NULL)
+            lang_key_len = png_strlen(text_ptr[i].lang_key);
+         else
+            lang_key_len = 0;
+      }
+#else /* PNG_iTXt_SUPPORTED */
+      {
+         png_warning(png_ptr, "iTXt chunk not supported.");
+         continue;
+      }
+#endif
+
+      if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')
+      {
+         text_length = 0;
+#ifdef PNG_iTXt_SUPPORTED
+         if (text_ptr[i].compression > 0)
+            textp->compression = PNG_ITXT_COMPRESSION_NONE;
+         else
+#endif
+            textp->compression = PNG_TEXT_COMPRESSION_NONE;
+      }
+
+      else
+      {
+         text_length = png_strlen(text_ptr[i].text);
+         textp->compression = text_ptr[i].compression;
+      }
+
+      textp->key = (png_charp)png_malloc_warn(png_ptr,
+         (png_uint_32)
+         (key_len + text_length + lang_len + lang_key_len + 4));
+      if (textp->key == NULL)
+         return(1);
+      png_debug2(2, "Allocated %lu bytes at %x in png_set_text",
+                 (png_uint_32)
+                 (key_len + lang_len + lang_key_len + text_length + 4),
+                 (int)textp->key);
+
+      png_memcpy(textp->key, text_ptr[i].key,(png_size_t)(key_len));
+      *(textp->key + key_len) = '\0';
+#ifdef PNG_iTXt_SUPPORTED
+      if (text_ptr[i].compression > 0)
+      {
+         textp->lang = textp->key + key_len + 1;
+         png_memcpy(textp->lang, text_ptr[i].lang, lang_len);
+         *(textp->lang + lang_len) = '\0';
+         textp->lang_key = textp->lang + lang_len + 1;
+         png_memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
+         *(textp->lang_key + lang_key_len) = '\0';
+         textp->text = textp->lang_key + lang_key_len + 1;
+      }
+      else
+#endif
+      {
+#ifdef PNG_iTXt_SUPPORTED
+         textp->lang=NULL;
+         textp->lang_key=NULL;
+#endif
+         textp->text = textp->key + key_len + 1;
+      }
+      if (text_length)
+         png_memcpy(textp->text, text_ptr[i].text,
+            (png_size_t)(text_length));
+      *(textp->text + text_length) = '\0';
+
+#ifdef PNG_iTXt_SUPPORTED
+      if (textp->compression > 0)
+      {
+         textp->text_length = 0;
+         textp->itxt_length = text_length;
+      }
+      else
+#endif
+
+      {
+         textp->text_length = text_length;
+#ifdef PNG_iTXt_SUPPORTED
+         textp->itxt_length = 0;
+#endif
+      }
+      info_ptr->num_text++;
+      png_debug1(3, "transferred text chunk %d", info_ptr->num_text);
+   }
+   return(0);
+}
+#endif
+
+#ifdef PNG_tIME_SUPPORTED
+void PNGAPI
+png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_timep mod_time)
+{
+   png_debug1(1, "in %s storage function", "tIME");
+
+   if (png_ptr == NULL || info_ptr == NULL ||
+       (png_ptr->mode & PNG_WROTE_tIME))
+      return;
+
+   png_memcpy(&(info_ptr->mod_time), mod_time, png_sizeof(png_time));
+   info_ptr->valid |= PNG_INFO_tIME;
+}
+#endif
+
+#ifdef PNG_tRNS_SUPPORTED
+void PNGAPI
+png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
+   png_bytep trans, int num_trans, png_color_16p trans_values)
+{
+   png_debug1(1, "in %s storage function", "tRNS");
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   if (trans != NULL)
+   {
+       /* It may not actually be necessary to set png_ptr->trans here;
+        * we do it for backward compatibility with the way the png_handle_tRNS
+        * function used to do the allocation.
+        */
+
+#ifdef PNG_FREE_ME_SUPPORTED
+       png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
+#endif
+
+       /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
+       png_ptr->trans = info_ptr->trans = (png_bytep)png_malloc(png_ptr,
+           (png_uint_32)PNG_MAX_PALETTE_LENGTH);
+       if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
+          png_memcpy(info_ptr->trans, trans, (png_size_t)num_trans);
+   }
+
+   if (trans_values != NULL)
+   {
+      int sample_max = (1 << info_ptr->bit_depth);
+      if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&
+          (int)trans_values->gray > sample_max) ||
+          (info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
+          ((int)trans_values->red > sample_max ||
+          (int)trans_values->green > sample_max ||
+          (int)trans_values->blue > sample_max)))
+         png_warning(png_ptr,
+            "tRNS chunk has out-of-range samples for bit_depth");
+      png_memcpy(&(info_ptr->trans_values), trans_values,
+         png_sizeof(png_color_16));
+      if (num_trans == 0)
+         num_trans = 1;
+   }
+
+   info_ptr->num_trans = (png_uint_16)num_trans;
+   if (num_trans != 0)
+   {
+      info_ptr->valid |= PNG_INFO_tRNS;
+#ifdef PNG_FREE_ME_SUPPORTED
+      info_ptr->free_me |= PNG_FREE_TRNS;
+#else
+      png_ptr->flags |= PNG_FLAG_FREE_TRNS;
+#endif
+   }
+}
+#endif
+
+#ifdef PNG_sPLT_SUPPORTED
+void PNGAPI
+png_set_sPLT(png_structp png_ptr,
+             png_infop info_ptr, png_sPLT_tp entries, int nentries)
+/*
+ *  entries        - array of png_sPLT_t structures
+ *                   to be added to the list of palettes
+ *                   in the info structure.
+ *  nentries       - number of palette structures to be
+ *                   added.
+ */
+{
+   png_sPLT_tp np;
+   int i;
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   np = (png_sPLT_tp)png_malloc_warn(png_ptr,
+       (info_ptr->splt_palettes_num + nentries) *
+        (png_uint_32)png_sizeof(png_sPLT_t));
+   if (np == NULL)
+   {
+      png_warning(png_ptr, "No memory for sPLT palettes.");
+      return;
+   }
+
+   png_memcpy(np, info_ptr->splt_palettes,
+       info_ptr->splt_palettes_num * png_sizeof(png_sPLT_t));
+   png_free(png_ptr, info_ptr->splt_palettes);
+   info_ptr->splt_palettes=NULL;
+
+   for (i = 0; i < nentries; i++)
+   {
+      png_sPLT_tp to = np + info_ptr->splt_palettes_num + i;
+      png_sPLT_tp from = entries + i;
+      png_uint_32 length;
+
+      length = png_strlen(from->name) + 1;
+      to->name = (png_charp)png_malloc_warn(png_ptr, length);
+      if (to->name == NULL)
+      {
+         png_warning(png_ptr,
+           "Out of memory while processing sPLT chunk");
+         continue;
+      }
+      png_memcpy(to->name, from->name, length);
+      to->entries = (png_sPLT_entryp)png_malloc_warn(png_ptr,
+          (png_uint_32)(from->nentries * png_sizeof(png_sPLT_entry)));
+      if (to->entries == NULL)
+      {
+         png_warning(png_ptr,
+           "Out of memory while processing sPLT chunk");
+         png_free(png_ptr, to->name);
+         to->name = NULL;
+         continue;
+      }
+      png_memcpy(to->entries, from->entries,
+          from->nentries * png_sizeof(png_sPLT_entry));
+      to->nentries = from->nentries;
+      to->depth = from->depth;
+   }
+
+   info_ptr->splt_palettes = np;
+   info_ptr->splt_palettes_num += nentries;
+   info_ptr->valid |= PNG_INFO_sPLT;
+#ifdef PNG_FREE_ME_SUPPORTED
+   info_ptr->free_me |= PNG_FREE_SPLT;
+#endif
+}
+#endif /* PNG_sPLT_SUPPORTED */
+
+#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
+void PNGAPI
+png_set_unknown_chunks(png_structp png_ptr,
+   png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)
+{
+   png_unknown_chunkp np;
+   int i;
+
+   if (png_ptr == NULL || info_ptr == NULL || num_unknowns == 0)
+      return;
+
+   np = (png_unknown_chunkp)png_malloc_warn(png_ptr,
+       (png_uint_32)((info_ptr->unknown_chunks_num + num_unknowns) *
+       png_sizeof(png_unknown_chunk)));
+   if (np == NULL)
+   {
+      png_warning(png_ptr,
+          "Out of memory while processing unknown chunk.");
+      return;
+   }
+
+   png_memcpy(np, info_ptr->unknown_chunks,
+       info_ptr->unknown_chunks_num * png_sizeof(png_unknown_chunk));
+   png_free(png_ptr, info_ptr->unknown_chunks);
+   info_ptr->unknown_chunks = NULL;
+
+   for (i = 0; i < num_unknowns; i++)
+   {
+      png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i;
+      png_unknown_chunkp from = unknowns + i;
+
+      png_memcpy((png_charp)to->name, (png_charp)from->name,
+          png_sizeof(from->name));
+      to->name[png_sizeof(to->name)-1] = '\0';
+      to->size = from->size;
+      /* Note our location in the read or write sequence */
+      to->location = (png_byte)(png_ptr->mode & 0xff);
+
+      if (from->size == 0)
+         to->data=NULL;
+      else
+      {
+         to->data = (png_bytep)png_malloc_warn(png_ptr,
+           (png_uint_32)from->size);
+         if (to->data == NULL)
+         {
+            png_warning(png_ptr,
+             "Out of memory while processing unknown chunk.");
+            to->size = 0;
+         }
+         else
+            png_memcpy(to->data, from->data, from->size);
+      }
+   }
+
+   info_ptr->unknown_chunks = np;
+   info_ptr->unknown_chunks_num += num_unknowns;
+#ifdef PNG_FREE_ME_SUPPORTED
+   info_ptr->free_me |= PNG_FREE_UNKN;
+#endif
+}
+void PNGAPI
+png_set_unknown_chunk_location(png_structp png_ptr, png_infop info_ptr,
+   int chunk, int location)
+{
+   if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 && chunk <
+       (int)info_ptr->unknown_chunks_num)
+      info_ptr->unknown_chunks[chunk].location = (png_byte)location;
+}
+#endif
+
+#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
+#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
+    defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
+void PNGAPI
+png_permit_empty_plte (png_structp png_ptr, int empty_plte_permitted)
+{
+   /* This function is deprecated in favor of png_permit_mng_features()
+      and will be removed from libpng-1.3.0 */
+
+   png_debug(1, "in png_permit_empty_plte, DEPRECATED.");
+
+   if (png_ptr == NULL)
+      return;
+   png_ptr->mng_features_permitted = (png_byte)
+     ((png_ptr->mng_features_permitted & (~PNG_FLAG_MNG_EMPTY_PLTE)) |
+     ((empty_plte_permitted & PNG_FLAG_MNG_EMPTY_PLTE)));
+}
+#endif
+#endif
+
+#ifdef PNG_MNG_FEATURES_SUPPORTED
+png_uint_32 PNGAPI
+png_permit_mng_features (png_structp png_ptr, png_uint_32 mng_features)
+{
+   png_debug(1, "in png_permit_mng_features");
+
+   if (png_ptr == NULL)
+      return (png_uint_32)0;
+   png_ptr->mng_features_permitted =
+     (png_byte)(mng_features & PNG_ALL_MNG_FEATURES);
+   return (png_uint_32)png_ptr->mng_features_permitted;
+}
+#endif
+
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+void PNGAPI
+png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_bytep
+   chunk_list, int num_chunks)
+{
+   png_bytep new_list, p;
+   int i, old_num_chunks;
+   if (png_ptr == NULL)
+      return;
+   if (num_chunks == 0)
+   {
+      if (keep == PNG_HANDLE_CHUNK_ALWAYS || keep == PNG_HANDLE_CHUNK_IF_SAFE)
+         png_ptr->flags |= PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
+      else
+         png_ptr->flags &= ~PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
+
+      if (keep == PNG_HANDLE_CHUNK_ALWAYS)
+         png_ptr->flags |= PNG_FLAG_KEEP_UNSAFE_CHUNKS;
+      else
+         png_ptr->flags &= ~PNG_FLAG_KEEP_UNSAFE_CHUNKS;
+      return;
+   }
+   if (chunk_list == NULL)
+      return;
+   old_num_chunks = png_ptr->num_chunk_list;
+   new_list=(png_bytep)png_malloc(png_ptr,
+      (png_uint_32)
+       (5*(num_chunks + old_num_chunks)));
+   if (png_ptr->chunk_list != NULL)
+   {
+      png_memcpy(new_list, png_ptr->chunk_list,
+          (png_size_t)(5*old_num_chunks));
+      png_free(png_ptr, png_ptr->chunk_list);
+      png_ptr->chunk_list=NULL;
+   }
+   png_memcpy(new_list + 5*old_num_chunks, chunk_list,
+       (png_size_t)(5*num_chunks));
+   for (p = new_list + 5*old_num_chunks + 4, i = 0; i<num_chunks; i++, p += 5)
+      *p=(png_byte)keep;
+   png_ptr->num_chunk_list = old_num_chunks + num_chunks;
+   png_ptr->chunk_list = new_list;
+#ifdef PNG_FREE_ME_SUPPORTED
+   png_ptr->free_me |= PNG_FREE_LIST;
+#endif
+}
+#endif
+
+#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
+void PNGAPI
+png_set_read_user_chunk_fn(png_structp png_ptr, png_voidp user_chunk_ptr,
+   png_user_chunk_ptr read_user_chunk_fn)
+{
+   png_debug(1, "in png_set_read_user_chunk_fn");
+
+   if (png_ptr == NULL)
+      return;
+
+   png_ptr->read_user_chunk_fn = read_user_chunk_fn;
+   png_ptr->user_chunk_ptr = user_chunk_ptr;
+}
+#endif
+
+#ifdef PNG_INFO_IMAGE_SUPPORTED
+void PNGAPI
+png_set_rows(png_structp png_ptr, png_infop info_ptr, png_bytepp row_pointers)
+{
+   png_debug1(1, "in %s storage function", "rows");
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   if (info_ptr->row_pointers && (info_ptr->row_pointers != row_pointers))
+      png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
+   info_ptr->row_pointers = row_pointers;
+   if (row_pointers)
+      info_ptr->valid |= PNG_INFO_IDAT;
+}
+#endif
+
+void PNGAPI
+png_set_compression_buffer_size(png_structp png_ptr,
+    png_uint_32 size)
+{
+    if (png_ptr == NULL)
+       return;
+    png_free(png_ptr, png_ptr->zbuf);
+    png_ptr->zbuf_size = (png_size_t)size;
+    png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, size);
+    png_ptr->zstream.next_out = png_ptr->zbuf;
+    png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+}
+
+void PNGAPI
+png_set_invalid(png_structp png_ptr, png_infop info_ptr, int mask)
+{
+   if (png_ptr && info_ptr)
+      info_ptr->valid &= ~mask;
+}
+
+
+#ifndef PNG_1_0_X
+#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
+/* Function was added to libpng 1.2.0 and should always exist by default */
+void PNGAPI
+png_set_asm_flags (png_structp png_ptr, png_uint_32 asm_flags)
+{
+/* Obsolete as of libpng-1.2.20 and will be removed from libpng-1.4.0 */
+    if (png_ptr != NULL)
+    png_ptr->asm_flags = 0;
+    asm_flags = asm_flags; /* Quiet the compiler */
+}
+
+/* This function was added to libpng 1.2.0 */
+void PNGAPI
+png_set_mmx_thresholds (png_structp png_ptr,
+                        png_byte mmx_bitdepth_threshold,
+                        png_uint_32 mmx_rowbytes_threshold)
+{
+/* Obsolete as of libpng-1.2.20 and will be removed from libpng-1.4.0 */
+    if (png_ptr == NULL)
+       return;
+    /* Quiet the compiler */
+    mmx_bitdepth_threshold = mmx_bitdepth_threshold;
+    mmx_rowbytes_threshold = mmx_rowbytes_threshold;
+}
+#endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
+
+#ifdef PNG_SET_USER_LIMITS_SUPPORTED
+/* This function was added to libpng 1.2.6 */
+void PNGAPI
+png_set_user_limits (png_structp png_ptr, png_uint_32 user_width_max,
+    png_uint_32 user_height_max)
+{
+   /* Images with dimensions larger than these limits will be
+    * rejected by png_set_IHDR().  To accept any PNG datastream
+    * regardless of dimensions, set both limits to 0x7ffffffL.
+    */
+   if (png_ptr == NULL)
+      return;
+   png_ptr->user_width_max = user_width_max;
+   png_ptr->user_height_max = user_height_max;
+}
+#endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
+
+
+#ifdef PNG_BENIGN_ERRORS_SUPPORTED
+void PNGAPI
+png_set_benign_errors(png_structp png_ptr, int allowed)
+{
+   png_debug(1, "in png_set_benign_errors");
+
+   if (allowed)
+      png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN;
+   else
+      png_ptr->flags &= ~PNG_FLAG_BENIGN_ERRORS_WARN;
+}
+#endif /* PNG_BENIGN_ERRORS_SUPPORTED */
+#endif /* ?PNG_1_0_X */
+#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
diff --git a/src/libpng/pngtrans.c b/src/libpng/pngtrans.c
new file mode 100644
index 0000000..6ad9dcf
--- /dev/null
+++ b/src/libpng/pngtrans.c
@@ -0,0 +1,699 @@
+
+/* pngtrans.c - transforms the data in a row (used by both readers and writers)
+ *
+ * Last changed in libpng 1.2.41 [December 3, 2009]
+ * Copyright (c) 1998-2009 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ */
+
+#define PNG_INTERNAL
+#define PNG_NO_PEDANTIC_WARNINGS
+#include "png.h"
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
+
+#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
+/* Turn on BGR-to-RGB mapping */
+void PNGAPI
+png_set_bgr(png_structp png_ptr)
+{
+   png_debug(1, "in png_set_bgr");
+
+   if (png_ptr == NULL)
+      return;
+   png_ptr->transformations |= PNG_BGR;
+}
+#endif
+
+#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
+/* Turn on 16 bit byte swapping */
+void PNGAPI
+png_set_swap(png_structp png_ptr)
+{
+   png_debug(1, "in png_set_swap");
+
+   if (png_ptr == NULL)
+      return;
+   if (png_ptr->bit_depth == 16)
+      png_ptr->transformations |= PNG_SWAP_BYTES;
+}
+#endif
+
+#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
+/* Turn on pixel packing */
+void PNGAPI
+png_set_packing(png_structp png_ptr)
+{
+   png_debug(1, "in png_set_packing");
+
+   if (png_ptr == NULL)
+      return;
+   if (png_ptr->bit_depth < 8)
+   {
+      png_ptr->transformations |= PNG_PACK;
+      png_ptr->usr_bit_depth = 8;
+   }
+}
+#endif
+
+#if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED)
+/* Turn on packed pixel swapping */
+void PNGAPI
+png_set_packswap(png_structp png_ptr)
+{
+   png_debug(1, "in png_set_packswap");
+
+   if (png_ptr == NULL)
+      return;
+   if (png_ptr->bit_depth < 8)
+      png_ptr->transformations |= PNG_PACKSWAP;
+}
+#endif
+
+#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
+void PNGAPI
+png_set_shift(png_structp png_ptr, png_color_8p true_bits)
+{
+   png_debug(1, "in png_set_shift");
+
+   if (png_ptr == NULL)
+      return;
+   png_ptr->transformations |= PNG_SHIFT;
+   png_ptr->shift = *true_bits;
+}
+#endif
+
+#if defined(PNG_READ_INTERLACING_SUPPORTED) || \
+    defined(PNG_WRITE_INTERLACING_SUPPORTED)
+int PNGAPI
+png_set_interlace_handling(png_structp png_ptr)
+{
+   png_debug(1, "in png_set_interlace handling");
+
+   if (png_ptr && png_ptr->interlaced)
+   {
+      png_ptr->transformations |= PNG_INTERLACE;
+      return (7);
+   }
+
+   return (1);
+}
+#endif
+
+#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
+/* Add a filler byte on read, or remove a filler or alpha byte on write.
+ * The filler type has changed in v0.95 to allow future 2-byte fillers
+ * for 48-bit input data, as well as to avoid problems with some compilers
+ * that don't like bytes as parameters.
+ */
+void PNGAPI
+png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc)
+{
+   png_debug(1, "in png_set_filler");
+
+   if (png_ptr == NULL)
+      return;
+   png_ptr->transformations |= PNG_FILLER;
+#ifdef PNG_LEGACY_SUPPORTED
+   png_ptr->filler = (png_byte)filler;
+#else
+   png_ptr->filler = (png_uint_16)filler;
+#endif
+   if (filler_loc == PNG_FILLER_AFTER)
+      png_ptr->flags |= PNG_FLAG_FILLER_AFTER;
+   else
+      png_ptr->flags &= ~PNG_FLAG_FILLER_AFTER;
+
+   /* This should probably go in the "do_read_filler" routine.
+    * I attempted to do that in libpng-1.0.1a but that caused problems
+    * so I restored it in libpng-1.0.2a
+   */
+
+   if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)
+   {
+      png_ptr->usr_channels = 4;
+   }
+
+   /* Also I added this in libpng-1.0.2a (what happens when we expand
+    * a less-than-8-bit grayscale to GA? */
+
+   if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY && png_ptr->bit_depth >= 8)
+   {
+      png_ptr->usr_channels = 2;
+   }
+}
+
+#ifndef PNG_1_0_X
+/* Added to libpng-1.2.7 */
+void PNGAPI
+png_set_add_alpha(png_structp png_ptr, png_uint_32 filler, int filler_loc)
+{
+   png_debug(1, "in png_set_add_alpha");
+
+   if (png_ptr == NULL)
+      return;
+   png_set_filler(png_ptr, filler, filler_loc);
+   png_ptr->transformations |= PNG_ADD_ALPHA;
+}
+#endif
+
+#endif
+
+#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
+    defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
+void PNGAPI
+png_set_swap_alpha(png_structp png_ptr)
+{
+   png_debug(1, "in png_set_swap_alpha");
+
+   if (png_ptr == NULL)
+      return;
+   png_ptr->transformations |= PNG_SWAP_ALPHA;
+}
+#endif
+
+#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
+    defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
+void PNGAPI
+png_set_invert_alpha(png_structp png_ptr)
+{
+   png_debug(1, "in png_set_invert_alpha");
+
+   if (png_ptr == NULL)
+      return;
+   png_ptr->transformations |= PNG_INVERT_ALPHA;
+}
+#endif
+
+#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
+void PNGAPI
+png_set_invert_mono(png_structp png_ptr)
+{
+   png_debug(1, "in png_set_invert_mono");
+
+   if (png_ptr == NULL)
+      return;
+   png_ptr->transformations |= PNG_INVERT_MONO;
+}
+
+/* Invert monochrome grayscale data */
+void /* PRIVATE */
+png_do_invert(png_row_infop row_info, png_bytep row)
+{
+   png_debug(1, "in png_do_invert");
+
+  /* This test removed from libpng version 1.0.13 and 1.2.0:
+   *   if (row_info->bit_depth == 1 &&
+   */
+#ifdef PNG_USELESS_TESTS_SUPPORTED
+   if (row == NULL || row_info == NULL)
+     return;
+#endif
+   if (row_info->color_type == PNG_COLOR_TYPE_GRAY)
+   {
+      png_bytep rp = row;
+      png_uint_32 i;
+      png_uint_32 istop = row_info->rowbytes;
+
+      for (i = 0; i < istop; i++)
+      {
+         *rp = (png_byte)(~(*rp));
+         rp++;
+      }
+   }
+   else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
+      row_info->bit_depth == 8)
+   {
+      png_bytep rp = row;
+      png_uint_32 i;
+      png_uint_32 istop = row_info->rowbytes;
+
+      for (i = 0; i < istop; i+=2)
+      {
+         *rp = (png_byte)(~(*rp));
+         rp+=2;
+      }
+   }
+   else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
+      row_info->bit_depth == 16)
+   {
+      png_bytep rp = row;
+      png_uint_32 i;
+      png_uint_32 istop = row_info->rowbytes;
+
+      for (i = 0; i < istop; i+=4)
+      {
+         *rp = (png_byte)(~(*rp));
+         *(rp+1) = (png_byte)(~(*(rp+1)));
+         rp+=4;
+      }
+   }
+}
+#endif
+
+#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
+/* Swaps byte order on 16 bit depth images */
+void /* PRIVATE */
+png_do_swap(png_row_infop row_info, png_bytep row)
+{
+   png_debug(1, "in png_do_swap");
+
+   if (
+#ifdef PNG_USELESS_TESTS_SUPPORTED
+       row != NULL && row_info != NULL &&
+#endif
+       row_info->bit_depth == 16)
+   {
+      png_bytep rp = row;
+      png_uint_32 i;
+      png_uint_32 istop= row_info->width * row_info->channels;
+
+      for (i = 0; i < istop; i++, rp += 2)
+      {
+         png_byte t = *rp;
+         *rp = *(rp + 1);
+         *(rp + 1) = t;
+      }
+   }
+}
+#endif
+
+#if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED)
+static PNG_CONST png_byte onebppswaptable[256] = {
+   0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0,
+   0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0,
+   0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8,
+   0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8,
+   0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4,
+   0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4,
+   0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC,
+   0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC,
+   0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2,
+   0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2,
+   0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA,
+   0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA,
+   0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6,
+   0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6,
+   0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE,
+   0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE,
+   0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1,
+   0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1,
+   0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9,
+   0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9,
+   0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5,
+   0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5,
+   0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED,
+   0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD,
+   0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3,
+   0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3,
+   0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB,
+   0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB,
+   0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7,
+   0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7,
+   0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF,
+   0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF
+};
+
+static PNG_CONST png_byte twobppswaptable[256] = {
+   0x00, 0x40, 0x80, 0xC0, 0x10, 0x50, 0x90, 0xD0,
+   0x20, 0x60, 0xA0, 0xE0, 0x30, 0x70, 0xB0, 0xF0,
+   0x04, 0x44, 0x84, 0xC4, 0x14, 0x54, 0x94, 0xD4,
+   0x24, 0x64, 0xA4, 0xE4, 0x34, 0x74, 0xB4, 0xF4,
+   0x08, 0x48, 0x88, 0xC8, 0x18, 0x58, 0x98, 0xD8,
+   0x28, 0x68, 0xA8, 0xE8, 0x38, 0x78, 0xB8, 0xF8,
+   0x0C, 0x4C, 0x8C, 0xCC, 0x1C, 0x5C, 0x9C, 0xDC,
+   0x2C, 0x6C, 0xAC, 0xEC, 0x3C, 0x7C, 0xBC, 0xFC,
+   0x01, 0x41, 0x81, 0xC1, 0x11, 0x51, 0x91, 0xD1,
+   0x21, 0x61, 0xA1, 0xE1, 0x31, 0x71, 0xB1, 0xF1,
+   0x05, 0x45, 0x85, 0xC5, 0x15, 0x55, 0x95, 0xD5,
+   0x25, 0x65, 0xA5, 0xE5, 0x35, 0x75, 0xB5, 0xF5,
+   0x09, 0x49, 0x89, 0xC9, 0x19, 0x59, 0x99, 0xD9,
+   0x29, 0x69, 0xA9, 0xE9, 0x39, 0x79, 0xB9, 0xF9,
+   0x0D, 0x4D, 0x8D, 0xCD, 0x1D, 0x5D, 0x9D, 0xDD,
+   0x2D, 0x6D, 0xAD, 0xED, 0x3D, 0x7D, 0xBD, 0xFD,
+   0x02, 0x42, 0x82, 0xC2, 0x12, 0x52, 0x92, 0xD2,
+   0x22, 0x62, 0xA2, 0xE2, 0x32, 0x72, 0xB2, 0xF2,
+   0x06, 0x46, 0x86, 0xC6, 0x16, 0x56, 0x96, 0xD6,
+   0x26, 0x66, 0xA6, 0xE6, 0x36, 0x76, 0xB6, 0xF6,
+   0x0A, 0x4A, 0x8A, 0xCA, 0x1A, 0x5A, 0x9A, 0xDA,
+   0x2A, 0x6A, 0xAA, 0xEA, 0x3A, 0x7A, 0xBA, 0xFA,
+   0x0E, 0x4E, 0x8E, 0xCE, 0x1E, 0x5E, 0x9E, 0xDE,
+   0x2E, 0x6E, 0xAE, 0xEE, 0x3E, 0x7E, 0xBE, 0xFE,
+   0x03, 0x43, 0x83, 0xC3, 0x13, 0x53, 0x93, 0xD3,
+   0x23, 0x63, 0xA3, 0xE3, 0x33, 0x73, 0xB3, 0xF3,
+   0x07, 0x47, 0x87, 0xC7, 0x17, 0x57, 0x97, 0xD7,
+   0x27, 0x67, 0xA7, 0xE7, 0x37, 0x77, 0xB7, 0xF7,
+   0x0B, 0x4B, 0x8B, 0xCB, 0x1B, 0x5B, 0x9B, 0xDB,
+   0x2B, 0x6B, 0xAB, 0xEB, 0x3B, 0x7B, 0xBB, 0xFB,
+   0x0F, 0x4F, 0x8F, 0xCF, 0x1F, 0x5F, 0x9F, 0xDF,
+   0x2F, 0x6F, 0xAF, 0xEF, 0x3F, 0x7F, 0xBF, 0xFF
+};
+
+static PNG_CONST png_byte fourbppswaptable[256] = {
+   0x00, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70,
+   0x80, 0x90, 0xA0, 0xB0, 0xC0, 0xD0, 0xE0, 0xF0,
+   0x01, 0x11, 0x21, 0x31, 0x41, 0x51, 0x61, 0x71,
+   0x81, 0x91, 0xA1, 0xB1, 0xC1, 0xD1, 0xE1, 0xF1,
+   0x02, 0x12, 0x22, 0x32, 0x42, 0x52, 0x62, 0x72,
+   0x82, 0x92, 0xA2, 0xB2, 0xC2, 0xD2, 0xE2, 0xF2,
+   0x03, 0x13, 0x23, 0x33, 0x43, 0x53, 0x63, 0x73,
+   0x83, 0x93, 0xA3, 0xB3, 0xC3, 0xD3, 0xE3, 0xF3,
+   0x04, 0x14, 0x24, 0x34, 0x44, 0x54, 0x64, 0x74,
+   0x84, 0x94, 0xA4, 0xB4, 0xC4, 0xD4, 0xE4, 0xF4,
+   0x05, 0x15, 0x25, 0x35, 0x45, 0x55, 0x65, 0x75,
+   0x85, 0x95, 0xA5, 0xB5, 0xC5, 0xD5, 0xE5, 0xF5,
+   0x06, 0x16, 0x26, 0x36, 0x46, 0x56, 0x66, 0x76,
+   0x86, 0x96, 0xA6, 0xB6, 0xC6, 0xD6, 0xE6, 0xF6,
+   0x07, 0x17, 0x27, 0x37, 0x47, 0x57, 0x67, 0x77,
+   0x87, 0x97, 0xA7, 0xB7, 0xC7, 0xD7, 0xE7, 0xF7,
+   0x08, 0x18, 0x28, 0x38, 0x48, 0x58, 0x68, 0x78,
+   0x88, 0x98, 0xA8, 0xB8, 0xC8, 0xD8, 0xE8, 0xF8,
+   0x09, 0x19, 0x29, 0x39, 0x49, 0x59, 0x69, 0x79,
+   0x89, 0x99, 0xA9, 0xB9, 0xC9, 0xD9, 0xE9, 0xF9,
+   0x0A, 0x1A, 0x2A, 0x3A, 0x4A, 0x5A, 0x6A, 0x7A,
+   0x8A, 0x9A, 0xAA, 0xBA, 0xCA, 0xDA, 0xEA, 0xFA,
+   0x0B, 0x1B, 0x2B, 0x3B, 0x4B, 0x5B, 0x6B, 0x7B,
+   0x8B, 0x9B, 0xAB, 0xBB, 0xCB, 0xDB, 0xEB, 0xFB,
+   0x0C, 0x1C, 0x2C, 0x3C, 0x4C, 0x5C, 0x6C, 0x7C,
+   0x8C, 0x9C, 0xAC, 0xBC, 0xCC, 0xDC, 0xEC, 0xFC,
+   0x0D, 0x1D, 0x2D, 0x3D, 0x4D, 0x5D, 0x6D, 0x7D,
+   0x8D, 0x9D, 0xAD, 0xBD, 0xCD, 0xDD, 0xED, 0xFD,
+   0x0E, 0x1E, 0x2E, 0x3E, 0x4E, 0x5E, 0x6E, 0x7E,
+   0x8E, 0x9E, 0xAE, 0xBE, 0xCE, 0xDE, 0xEE, 0xFE,
+   0x0F, 0x1F, 0x2F, 0x3F, 0x4F, 0x5F, 0x6F, 0x7F,
+   0x8F, 0x9F, 0xAF, 0xBF, 0xCF, 0xDF, 0xEF, 0xFF
+};
+
+/* Swaps pixel packing order within bytes */
+void /* PRIVATE */
+png_do_packswap(png_row_infop row_info, png_bytep row)
+{
+   png_debug(1, "in png_do_packswap");
+
+   if (
+#ifdef PNG_USELESS_TESTS_SUPPORTED
+       row != NULL && row_info != NULL &&
+#endif
+       row_info->bit_depth < 8)
+   {
+      png_bytep rp, end, table;
+
+      end = row + row_info->rowbytes;
+
+      if (row_info->bit_depth == 1)
+         table = (png_bytep)onebppswaptable;
+      else if (row_info->bit_depth == 2)
+         table = (png_bytep)twobppswaptable;
+      else if (row_info->bit_depth == 4)
+         table = (png_bytep)fourbppswaptable;
+      else
+         return;
+
+      for (rp = row; rp < end; rp++)
+         *rp = table[*rp];
+   }
+}
+#endif /* PNG_READ_PACKSWAP_SUPPORTED or PNG_WRITE_PACKSWAP_SUPPORTED */
+
+#if defined(PNG_WRITE_FILLER_SUPPORTED) || \
+    defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
+/* Remove filler or alpha byte(s) */
+void /* PRIVATE */
+png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
+{
+   png_debug(1, "in png_do_strip_filler");
+
+#ifdef PNG_USELESS_TESTS_SUPPORTED
+   if (row != NULL && row_info != NULL)
+#endif
+   {
+      png_bytep sp=row;
+      png_bytep dp=row;
+      png_uint_32 row_width=row_info->width;
+      png_uint_32 i;
+
+      if ((row_info->color_type == PNG_COLOR_TYPE_RGB ||
+          (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA &&
+          (flags & PNG_FLAG_STRIP_ALPHA))) &&
+          row_info->channels == 4)
+      {
+         if (row_info->bit_depth == 8)
+         {
+            /* This converts from RGBX or RGBA to RGB */
+            if (flags & PNG_FLAG_FILLER_AFTER)
+            {
+               dp+=3; sp+=4;
+               for (i = 1; i < row_width; i++)
+               {
+                  *dp++ = *sp++;
+                  *dp++ = *sp++;
+                  *dp++ = *sp++;
+                  sp++;
+               }
+            }
+            /* This converts from XRGB or ARGB to RGB */
+            else
+            {
+               for (i = 0; i < row_width; i++)
+               {
+                  sp++;
+                  *dp++ = *sp++;
+                  *dp++ = *sp++;
+                  *dp++ = *sp++;
+               }
+            }
+            row_info->pixel_depth = 24;
+            row_info->rowbytes = row_width * 3;
+         }
+         else /* if (row_info->bit_depth == 16) */
+         {
+            if (flags & PNG_FLAG_FILLER_AFTER)
+            {
+               /* This converts from RRGGBBXX or RRGGBBAA to RRGGBB */
+               sp += 8; dp += 6;
+               for (i = 1; i < row_width; i++)
+               {
+                  /* This could be (although png_memcpy is probably slower):
+                  png_memcpy(dp, sp, 6);
+                  sp += 8;
+                  dp += 6;
+                  */
+
+                  *dp++ = *sp++;
+                  *dp++ = *sp++;
+                  *dp++ = *sp++;
+                  *dp++ = *sp++;
+                  *dp++ = *sp++;
+                  *dp++ = *sp++;
+                  sp += 2;
+               }
+            }
+            else
+            {
+               /* This converts from XXRRGGBB or AARRGGBB to RRGGBB */
+               for (i = 0; i < row_width; i++)
+               {
+                  /* This could be (although png_memcpy is probably slower):
+                  png_memcpy(dp, sp, 6);
+                  sp += 8;
+                  dp += 6;
+                  */
+
+                  sp+=2;
+                  *dp++ = *sp++;
+                  *dp++ = *sp++;
+                  *dp++ = *sp++;
+                  *dp++ = *sp++;
+                  *dp++ = *sp++;
+                  *dp++ = *sp++;
+               }
+            }
+            row_info->pixel_depth = 48;
+            row_info->rowbytes = row_width * 6;
+         }
+         row_info->channels = 3;
+      }
+      else if ((row_info->color_type == PNG_COLOR_TYPE_GRAY ||
+         (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
+         (flags & PNG_FLAG_STRIP_ALPHA))) &&
+          row_info->channels == 2)
+      {
+         if (row_info->bit_depth == 8)
+         {
+            /* This converts from GX or GA to G */
+            if (flags & PNG_FLAG_FILLER_AFTER)
+            {
+               for (i = 0; i < row_width; i++)
+               {
+                  *dp++ = *sp++;
+                  sp++;
+               }
+            }
+            /* This converts from XG or AG to G */
+            else
+            {
+               for (i = 0; i < row_width; i++)
+               {
+                  sp++;
+                  *dp++ = *sp++;
+               }
+            }
+            row_info->pixel_depth = 8;
+            row_info->rowbytes = row_width;
+         }
+         else /* if (row_info->bit_depth == 16) */
+         {
+            if (flags & PNG_FLAG_FILLER_AFTER)
+            {
+               /* This converts from GGXX or GGAA to GG */
+               sp += 4; dp += 2;
+               for (i = 1; i < row_width; i++)
+               {
+                  *dp++ = *sp++;
+                  *dp++ = *sp++;
+                  sp += 2;
+               }
+            }
+            else
+            {
+               /* This converts from XXGG or AAGG to GG */
+               for (i = 0; i < row_width; i++)
+               {
+                  sp += 2;
+                  *dp++ = *sp++;
+                  *dp++ = *sp++;
+               }
+            }
+            row_info->pixel_depth = 16;
+            row_info->rowbytes = row_width * 2;
+         }
+         row_info->channels = 1;
+      }
+      if (flags & PNG_FLAG_STRIP_ALPHA)
+        row_info->color_type &= ~PNG_COLOR_MASK_ALPHA;
+   }
+}
+#endif
+
+#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
+/* Swaps red and blue bytes within a pixel */
+void /* PRIVATE */
+png_do_bgr(png_row_infop row_info, png_bytep row)
+{
+   png_debug(1, "in png_do_bgr");
+
+   if (
+#ifdef PNG_USELESS_TESTS_SUPPORTED
+       row != NULL && row_info != NULL &&
+#endif
+       (row_info->color_type & PNG_COLOR_MASK_COLOR))
+   {
+      png_uint_32 row_width = row_info->width;
+      if (row_info->bit_depth == 8)
+      {
+         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
+         {
+            png_bytep rp;
+            png_uint_32 i;
+
+            for (i = 0, rp = row; i < row_width; i++, rp += 3)
+            {
+               png_byte save = *rp;
+               *rp = *(rp + 2);
+               *(rp + 2) = save;
+            }
+         }
+         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+         {
+            png_bytep rp;
+            png_uint_32 i;
+
+            for (i = 0, rp = row; i < row_width; i++, rp += 4)
+            {
+               png_byte save = *rp;
+               *rp = *(rp + 2);
+               *(rp + 2) = save;
+            }
+         }
+      }
+      else if (row_info->bit_depth == 16)
+      {
+         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
+         {
+            png_bytep rp;
+            png_uint_32 i;
+
+            for (i = 0, rp = row; i < row_width; i++, rp += 6)
+            {
+               png_byte save = *rp;
+               *rp = *(rp + 4);
+               *(rp + 4) = save;
+               save = *(rp + 1);
+               *(rp + 1) = *(rp + 5);
+               *(rp + 5) = save;
+            }
+         }
+         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+         {
+            png_bytep rp;
+            png_uint_32 i;
+
+            for (i = 0, rp = row; i < row_width; i++, rp += 8)
+            {
+               png_byte save = *rp;
+               *rp = *(rp + 4);
+               *(rp + 4) = save;
+               save = *(rp + 1);
+               *(rp + 1) = *(rp + 5);
+               *(rp + 5) = save;
+            }
+         }
+      }
+   }
+}
+#endif /* PNG_READ_BGR_SUPPORTED or PNG_WRITE_BGR_SUPPORTED */
+
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
+    defined(PNG_LEGACY_SUPPORTED) || \
+    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+void PNGAPI
+png_set_user_transform_info(png_structp png_ptr, png_voidp
+   user_transform_ptr, int user_transform_depth, int user_transform_channels)
+{
+   png_debug(1, "in png_set_user_transform_info");
+
+   if (png_ptr == NULL)
+      return;
+#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
+   png_ptr->user_transform_ptr = user_transform_ptr;
+   png_ptr->user_transform_depth = (png_byte)user_transform_depth;
+   png_ptr->user_transform_channels = (png_byte)user_transform_channels;
+#else
+   if (user_transform_ptr || user_transform_depth || user_transform_channels)
+      png_warning(png_ptr,
+        "This version of libpng does not support user transform info");
+#endif
+}
+#endif
+
+/* This function returns a pointer to the user_transform_ptr associated with
+ * the user transform functions.  The application should free any memory
+ * associated with this pointer before png_write_destroy and png_read_destroy
+ * are called.
+ */
+png_voidp PNGAPI
+png_get_user_transform_ptr(png_structp png_ptr)
+{
+   if (png_ptr == NULL)
+      return (NULL);
+#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
+   return ((png_voidp)png_ptr->user_transform_ptr);
+#else
+   return (NULL);
+#endif
+}
+#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
diff --git a/src/libpng/pngvcrd.c b/src/libpng/pngvcrd.c
new file mode 100644
index 0000000..ce4233e
--- /dev/null
+++ b/src/libpng/pngvcrd.c
@@ -0,0 +1 @@
+/* pnggvrd.c was removed from libpng-1.2.20. */
diff --git a/src/libpng/pngwio.c b/src/libpng/pngwio.c
new file mode 100644
index 0000000..44e5ea9
--- /dev/null
+++ b/src/libpng/pngwio.c
@@ -0,0 +1,260 @@
+
+/* pngwio.c - functions for data output
+ *
+ * Last changed in libpng 1.2.41 [December 3, 2009]
+ * Copyright (c) 1998-2009 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
+ * This file provides a location for all output.  Users who need
+ * special handling are expected to write functions that have the same
+ * arguments as these and perform similar functions, but that possibly
+ * use different output methods.  Note that you shouldn't change these
+ * functions, but rather write replacement functions and then change
+ * them at run time with png_set_write_fn(...).
+ */
+
+#define PNG_INTERNAL
+#define PNG_NO_PEDANTIC_WARNINGS
+#include "png.h"
+#ifdef PNG_WRITE_SUPPORTED
+
+/* Write the data to whatever output you are using.  The default routine
+ * writes to a file pointer.  Note that this routine sometimes gets called
+ * with very small lengths, so you should implement some kind of simple
+ * buffering if you are using unbuffered writes.  This should never be asked
+ * to write more than 64K on a 16 bit machine.
+ */
+
+void /* PRIVATE */
+png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
+{
+   if (png_ptr->write_data_fn != NULL )
+      (*(png_ptr->write_data_fn))(png_ptr, data, length);
+   else
+      png_error(png_ptr, "Call to NULL write function");
+}
+
+#ifdef PNG_STDIO_SUPPORTED
+/* This is the function that does the actual writing of data.  If you are
+ * not writing to a standard C stream, you should create a replacement
+ * write_data function and use it at run time with png_set_write_fn(), rather
+ * than changing the library.
+ */
+#ifndef USE_FAR_KEYWORD
+void PNGAPI
+png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
+{
+   png_uint_32 check;
+
+   if (png_ptr == NULL)
+      return;
+#ifdef _WIN32_WCE
+   if ( !WriteFile((HANDLE)(png_ptr->io_ptr), data, length, &check, NULL) )
+      check = 0;
+#else
+   check = fwrite(data, 1, length, (png_FILE_p)(png_ptr->io_ptr));
+#endif
+   if (check != length)
+      png_error(png_ptr, "Write Error");
+}
+#else
+/* This is the model-independent version. Since the standard I/O library
+ * can't handle far buffers in the medium and small models, we have to copy
+ * the data.
+ */
+
+#define NEAR_BUF_SIZE 1024
+#define MIN(a,b) (a <= b ? a : b)
+
+void PNGAPI
+png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
+{
+   png_uint_32 check;
+   png_byte *near_data;  /* Needs to be "png_byte *" instead of "png_bytep" */
+   png_FILE_p io_ptr;
+
+   if (png_ptr == NULL)
+      return;
+   /* Check if data really is near. If so, use usual code. */
+   near_data = (png_byte *)CVT_PTR_NOCHECK(data);
+   io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
+   if ((png_bytep)near_data == data)
+   {
+#ifdef _WIN32_WCE
+      if ( !WriteFile(io_ptr, near_data, length, &check, NULL) )
+         check = 0;
+#else
+      check = fwrite(near_data, 1, length, io_ptr);
+#endif
+   }
+   else
+   {
+      png_byte buf[NEAR_BUF_SIZE];
+      png_size_t written, remaining, err;
+      check = 0;
+      remaining = length;
+      do
+      {
+         written = MIN(NEAR_BUF_SIZE, remaining);
+         png_memcpy(buf, data, written); /* Copy far buffer to near buffer */
+#ifdef _WIN32_WCE
+         if ( !WriteFile(io_ptr, buf, written, &err, NULL) )
+            err = 0;
+#else
+         err = fwrite(buf, 1, written, io_ptr);
+#endif
+         if (err != written)
+            break;
+
+         else
+            check += err;
+
+         data += written;
+         remaining -= written;
+      }
+      while (remaining != 0);
+   }
+   if (check != length)
+      png_error(png_ptr, "Write Error");
+}
+
+#endif
+#endif
+
+/* This function is called to output any data pending writing (normally
+ * to disk).  After png_flush is called, there should be no data pending
+ * writing in any buffers.
+ */
+#ifdef PNG_WRITE_FLUSH_SUPPORTED
+void /* PRIVATE */
+png_flush(png_structp png_ptr)
+{
+   if (png_ptr->output_flush_fn != NULL)
+      (*(png_ptr->output_flush_fn))(png_ptr);
+}
+
+#ifdef PNG_STDIO_SUPPORTED
+void PNGAPI
+png_default_flush(png_structp png_ptr)
+{
+#ifndef _WIN32_WCE
+   png_FILE_p io_ptr;
+#endif
+   if (png_ptr == NULL)
+      return;
+#ifndef _WIN32_WCE
+   io_ptr = (png_FILE_p)CVT_PTR((png_ptr->io_ptr));
+   fflush(io_ptr);
+#endif
+}
+#endif
+#endif
+
+/* This function allows the application to supply new output functions for
+ * libpng if standard C streams aren't being used.
+ *
+ * This function takes as its arguments:
+ * png_ptr       - pointer to a png output data structure
+ * io_ptr        - pointer to user supplied structure containing info about
+ *                 the output functions.  May be NULL.
+ * write_data_fn - pointer to a new output function that takes as its
+ *                 arguments a pointer to a png_struct, a pointer to
+ *                 data to be written, and a 32-bit unsigned int that is
+ *                 the number of bytes to be written.  The new write
+ *                 function should call png_error(png_ptr, "Error msg")
+ *                 to exit and output any fatal error messages.  May be
+ *                 NULL, in which case libpng's default function will
+ *                 be used.
+ * flush_data_fn - pointer to a new flush function that takes as its
+ *                 arguments a pointer to a png_struct.  After a call to
+ *                 the flush function, there should be no data in any buffers
+ *                 or pending transmission.  If the output method doesn't do
+ *                 any buffering of output, a function prototype must still be
+ *                 supplied although it doesn't have to do anything.  If
+ *                 PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile
+ *                 time, output_flush_fn will be ignored, although it must be
+ *                 supplied for compatibility.  May be NULL, in which case
+ *                 libpng's default function will be used, if
+ *                 PNG_WRITE_FLUSH_SUPPORTED is defined.  This is not
+ *                 a good idea if io_ptr does not point to a standard
+ *                 *FILE structure.
+ */
+void PNGAPI
+png_set_write_fn(png_structp png_ptr, png_voidp io_ptr,
+   png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)
+{
+   if (png_ptr == NULL)
+      return;
+
+   png_ptr->io_ptr = io_ptr;
+
+#ifdef PNG_STDIO_SUPPORTED
+   if (write_data_fn != NULL)
+      png_ptr->write_data_fn = write_data_fn;
+
+   else
+      png_ptr->write_data_fn = png_default_write_data;
+#else
+   png_ptr->write_data_fn = write_data_fn;
+#endif
+
+#ifdef PNG_WRITE_FLUSH_SUPPORTED
+#ifdef PNG_STDIO_SUPPORTED
+   if (output_flush_fn != NULL)
+      png_ptr->output_flush_fn = output_flush_fn;
+
+   else
+      png_ptr->output_flush_fn = png_default_flush;
+#else
+   png_ptr->output_flush_fn = output_flush_fn;
+#endif
+#endif /* PNG_WRITE_FLUSH_SUPPORTED */
+
+   /* It is an error to read while writing a png file */
+   if (png_ptr->read_data_fn != NULL)
+   {
+      png_ptr->read_data_fn = NULL;
+      png_warning(png_ptr,
+         "Attempted to set both read_data_fn and write_data_fn in");
+      png_warning(png_ptr,
+         "the same structure.  Resetting read_data_fn to NULL.");
+   }
+}
+
+#ifdef USE_FAR_KEYWORD
+#ifdef _MSC_VER
+void *png_far_to_near(png_structp png_ptr, png_voidp ptr, int check)
+{
+   void *near_ptr;
+   void FAR *far_ptr;
+   FP_OFF(near_ptr) = FP_OFF(ptr);
+   far_ptr = (void FAR *)near_ptr;
+
+   if (check != 0)
+      if (FP_SEG(ptr) != FP_SEG(far_ptr))
+         png_error(png_ptr, "segment lost in conversion");
+
+   return(near_ptr);
+}
+#  else
+void *png_far_to_near(png_structp png_ptr, png_voidp ptr, int check)
+{
+   void *near_ptr;
+   void FAR *far_ptr;
+   near_ptr = (void FAR *)ptr;
+   far_ptr = (void FAR *)near_ptr;
+
+   if (check != 0)
+      if (far_ptr != ptr)
+         png_error(png_ptr, "segment lost in conversion");
+
+   return(near_ptr);
+}
+#   endif
+#   endif
+#endif /* PNG_WRITE_SUPPORTED */
diff --git a/src/libpng/pngwrite.c b/src/libpng/pngwrite.c
new file mode 100644
index 0000000..1d8c53f
--- /dev/null
+++ b/src/libpng/pngwrite.c
@@ -0,0 +1,1593 @@
+
+/* pngwrite.c - general routines to write a PNG file
+ *
+ * Last changed in libpng 1.2.45 [July 7, 2011]
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ */
+
+/* Get internal access to png.h */
+#define PNG_INTERNAL
+#define PNG_NO_PEDANTIC_WARNINGS
+#include "png.h"
+#ifdef PNG_WRITE_SUPPORTED
+
+/* Writes all the PNG information.  This is the suggested way to use the
+ * library.  If you have a new chunk to add, make a function to write it,
+ * and put it in the correct location here.  If you want the chunk written
+ * after the image data, put it in png_write_end().  I strongly encourage
+ * you to supply a PNG_INFO_ flag, and check info_ptr->valid before writing
+ * the chunk, as that will keep the code from breaking if you want to just
+ * write a plain PNG file.  If you have long comments, I suggest writing
+ * them in png_write_end(), and compressing them.
+ */
+void PNGAPI
+png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
+{
+   png_debug(1, "in png_write_info_before_PLTE");
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+   if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
+   {
+   /* Write PNG signature */
+   png_write_sig(png_ptr);
+#ifdef PNG_MNG_FEATURES_SUPPORTED
+   if ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) && \
+      (png_ptr->mng_features_permitted))
+   {
+      png_warning(png_ptr, "MNG features are not allowed in a PNG datastream");
+      png_ptr->mng_features_permitted = 0;
+   }
+#endif
+   /* Write IHDR information. */
+   png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height,
+      info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type,
+      info_ptr->filter_type,
+#ifdef PNG_WRITE_INTERLACING_SUPPORTED
+      info_ptr->interlace_type);
+#else
+      0);
+#endif
+   /* The rest of these check to see if the valid field has the appropriate
+    * flag set, and if it does, writes the chunk.
+    */
+#ifdef PNG_WRITE_gAMA_SUPPORTED
+   if (info_ptr->valid & PNG_INFO_gAMA)
+   {
+#  ifdef PNG_FLOATING_POINT_SUPPORTED
+      png_write_gAMA(png_ptr, info_ptr->gamma);
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+      png_write_gAMA_fixed(png_ptr, info_ptr->int_gamma);
+#  endif
+#endif
+   }
+#endif
+#ifdef PNG_WRITE_sRGB_SUPPORTED
+   if (info_ptr->valid & PNG_INFO_sRGB)
+      png_write_sRGB(png_ptr, (int)info_ptr->srgb_intent);
+#endif
+#ifdef PNG_WRITE_iCCP_SUPPORTED
+   if (info_ptr->valid & PNG_INFO_iCCP)
+      png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_COMPRESSION_TYPE_BASE,
+                     info_ptr->iccp_profile, (int)info_ptr->iccp_proflen);
+#endif
+#ifdef PNG_WRITE_sBIT_SUPPORTED
+   if (info_ptr->valid & PNG_INFO_sBIT)
+      png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type);
+#endif
+#ifdef PNG_WRITE_cHRM_SUPPORTED
+   if (info_ptr->valid & PNG_INFO_cHRM)
+   {
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+      png_write_cHRM(png_ptr,
+         info_ptr->x_white, info_ptr->y_white,
+         info_ptr->x_red, info_ptr->y_red,
+         info_ptr->x_green, info_ptr->y_green,
+         info_ptr->x_blue, info_ptr->y_blue);
+#else
+#  ifdef PNG_FIXED_POINT_SUPPORTED
+      png_write_cHRM_fixed(png_ptr,
+         info_ptr->int_x_white, info_ptr->int_y_white,
+         info_ptr->int_x_red, info_ptr->int_y_red,
+         info_ptr->int_x_green, info_ptr->int_y_green,
+         info_ptr->int_x_blue, info_ptr->int_y_blue);
+#  endif
+#endif
+   }
+#endif
+#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
+   if (info_ptr->unknown_chunks_num)
+   {
+      png_unknown_chunk *up;
+
+      png_debug(5, "writing extra chunks");
+
+      for (up = info_ptr->unknown_chunks;
+           up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
+           up++)
+      {
+         int keep = png_handle_as_unknown(png_ptr, up->name);
+         if (keep != PNG_HANDLE_CHUNK_NEVER &&
+            up->location && !(up->location & PNG_HAVE_PLTE) &&
+            !(up->location & PNG_HAVE_IDAT) &&
+            ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
+            (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
+         {
+            if (up->size == 0)
+               png_warning(png_ptr, "Writing zero-length unknown chunk");
+            png_write_chunk(png_ptr, up->name, up->data, up->size);
+         }
+      }
+   }
+#endif
+      png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE;
+   }
+}
+
+void PNGAPI
+png_write_info(png_structp png_ptr, png_infop info_ptr)
+{
+#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
+   int i;
+#endif
+
+   png_debug(1, "in png_write_info");
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   png_write_info_before_PLTE(png_ptr, info_ptr);
+
+   if (info_ptr->valid & PNG_INFO_PLTE)
+      png_write_PLTE(png_ptr, info_ptr->palette,
+         (png_uint_32)info_ptr->num_palette);
+   else if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
+      png_error(png_ptr, "Valid palette required for paletted images");
+
+#ifdef PNG_WRITE_tRNS_SUPPORTED
+   if (info_ptr->valid & PNG_INFO_tRNS)
+   {
+#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
+      /* Invert the alpha channel (in tRNS) */
+      if ((png_ptr->transformations & PNG_INVERT_ALPHA) &&
+         info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
+      {
+         int j;
+         for (j = 0; j<(int)info_ptr->num_trans; j++)
+            info_ptr->trans[j] = (png_byte)(255 - info_ptr->trans[j]);
+      }
+#endif
+      png_write_tRNS(png_ptr, info_ptr->trans, &(info_ptr->trans_values),
+         info_ptr->num_trans, info_ptr->color_type);
+   }
+#endif
+#ifdef PNG_WRITE_bKGD_SUPPORTED
+   if (info_ptr->valid & PNG_INFO_bKGD)
+      png_write_bKGD(png_ptr, &(info_ptr->background), info_ptr->color_type);
+#endif
+#ifdef PNG_WRITE_hIST_SUPPORTED
+   if (info_ptr->valid & PNG_INFO_hIST)
+      png_write_hIST(png_ptr, info_ptr->hist, info_ptr->num_palette);
+#endif
+#ifdef PNG_WRITE_oFFs_SUPPORTED
+   if (info_ptr->valid & PNG_INFO_oFFs)
+      png_write_oFFs(png_ptr, info_ptr->x_offset, info_ptr->y_offset,
+         info_ptr->offset_unit_type);
+#endif
+#ifdef PNG_WRITE_pCAL_SUPPORTED
+   if (info_ptr->valid & PNG_INFO_pCAL)
+      png_write_pCAL(png_ptr, info_ptr->pcal_purpose, info_ptr->pcal_X0,
+         info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams,
+         info_ptr->pcal_units, info_ptr->pcal_params);
+#endif
+
+#ifdef PNG_sCAL_SUPPORTED
+   if (info_ptr->valid & PNG_INFO_sCAL)
+#ifdef PNG_WRITE_sCAL_SUPPORTED
+#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_STDIO_SUPPORTED)
+      png_write_sCAL(png_ptr, (int)info_ptr->scal_unit,
+          info_ptr->scal_pixel_width, info_ptr->scal_pixel_height);
+#else /* !FLOATING_POINT */
+#ifdef PNG_FIXED_POINT_SUPPORTED
+      png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit,
+          info_ptr->scal_s_width, info_ptr->scal_s_height);
+#endif /* FIXED_POINT */
+#endif /* FLOATING_POINT */
+#else  /* !WRITE_sCAL */
+      png_warning(png_ptr,
+          "png_write_sCAL not supported; sCAL chunk not written.");
+#endif /* WRITE_sCAL */
+#endif /* sCAL */
+
+#ifdef PNG_WRITE_pHYs_SUPPORTED
+   if (info_ptr->valid & PNG_INFO_pHYs)
+      png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit,
+         info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type);
+#endif /* pHYs */
+
+#ifdef PNG_WRITE_tIME_SUPPORTED
+   if (info_ptr->valid & PNG_INFO_tIME)
+   {
+      png_write_tIME(png_ptr, &(info_ptr->mod_time));
+      png_ptr->mode |= PNG_WROTE_tIME;
+   }
+#endif /* tIME */
+
+#ifdef PNG_WRITE_sPLT_SUPPORTED
+   if (info_ptr->valid & PNG_INFO_sPLT)
+     for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
+       png_write_sPLT(png_ptr, info_ptr->splt_palettes + i);
+#endif /* sPLT */
+
+#ifdef PNG_WRITE_TEXT_SUPPORTED
+   /* Check to see if we need to write text chunks */
+   for (i = 0; i < info_ptr->num_text; i++)
+   {
+      png_debug2(2, "Writing header text chunk %d, type %d", i,
+         info_ptr->text[i].compression);
+      /* An internationalized chunk? */
+      if (info_ptr->text[i].compression > 0)
+      {
+#ifdef PNG_WRITE_iTXt_SUPPORTED
+          /* Write international chunk */
+          png_write_iTXt(png_ptr,
+                         info_ptr->text[i].compression,
+                         info_ptr->text[i].key,
+                         info_ptr->text[i].lang,
+                         info_ptr->text[i].lang_key,
+                         info_ptr->text[i].text);
+#else
+          png_warning(png_ptr, "Unable to write international text");
+#endif
+          /* Mark this chunk as written */
+          info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
+      }
+      /* If we want a compressed text chunk */
+      else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt)
+      {
+#ifdef PNG_WRITE_zTXt_SUPPORTED
+         /* Write compressed chunk */
+         png_write_zTXt(png_ptr, info_ptr->text[i].key,
+            info_ptr->text[i].text, 0,
+            info_ptr->text[i].compression);
+#else
+         png_warning(png_ptr, "Unable to write compressed text");
+#endif
+         /* Mark this chunk as written */
+         info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
+      }
+      else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
+      {
+#ifdef PNG_WRITE_tEXt_SUPPORTED
+         /* Write uncompressed chunk */
+         png_write_tEXt(png_ptr, info_ptr->text[i].key,
+                         info_ptr->text[i].text,
+                         0);
+         /* Mark this chunk as written */
+         info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
+#else
+         /* Can't get here */
+         png_warning(png_ptr, "Unable to write uncompressed text");
+#endif
+      }
+   }
+#endif /* tEXt */
+
+#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
+   if (info_ptr->unknown_chunks_num)
+   {
+      png_unknown_chunk *up;
+
+      png_debug(5, "writing extra chunks");
+
+      for (up = info_ptr->unknown_chunks;
+           up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
+           up++)
+      {
+         int keep = png_handle_as_unknown(png_ptr, up->name);
+         if (keep != PNG_HANDLE_CHUNK_NEVER &&
+            up->location && (up->location & PNG_HAVE_PLTE) &&
+            !(up->location & PNG_HAVE_IDAT) &&
+            !(up->location & PNG_AFTER_IDAT) &&
+            ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
+            (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
+         {
+            png_write_chunk(png_ptr, up->name, up->data, up->size);
+         }
+      }
+   }
+#endif
+}
+
+/* Writes the end of the PNG file.  If you don't want to write comments or
+ * time information, you can pass NULL for info.  If you already wrote these
+ * in png_write_info(), do not write them again here.  If you have long
+ * comments, I suggest writing them here, and compressing them.
+ */
+void PNGAPI
+png_write_end(png_structp png_ptr, png_infop info_ptr)
+{
+   png_debug(1, "in png_write_end");
+
+   if (png_ptr == NULL)
+      return;
+   if (!(png_ptr->mode & PNG_HAVE_IDAT))
+      png_error(png_ptr, "No IDATs written into file");
+
+   /* See if user wants us to write information chunks */
+   if (info_ptr != NULL)
+   {
+#ifdef PNG_WRITE_TEXT_SUPPORTED
+      int i; /* local index variable */
+#endif
+#ifdef PNG_WRITE_tIME_SUPPORTED
+      /* Check to see if user has supplied a time chunk */
+      if ((info_ptr->valid & PNG_INFO_tIME) &&
+         !(png_ptr->mode & PNG_WROTE_tIME))
+         png_write_tIME(png_ptr, &(info_ptr->mod_time));
+#endif
+#ifdef PNG_WRITE_TEXT_SUPPORTED
+      /* Loop through comment chunks */
+      for (i = 0; i < info_ptr->num_text; i++)
+      {
+         png_debug2(2, "Writing trailer text chunk %d, type %d", i,
+            info_ptr->text[i].compression);
+         /* An internationalized chunk? */
+         if (info_ptr->text[i].compression > 0)
+         {
+#ifdef PNG_WRITE_iTXt_SUPPORTED
+            /* Write international chunk */
+            png_write_iTXt(png_ptr,
+                        info_ptr->text[i].compression,
+                        info_ptr->text[i].key,
+                        info_ptr->text[i].lang,
+                        info_ptr->text[i].lang_key,
+                        info_ptr->text[i].text);
+#else
+            png_warning(png_ptr, "Unable to write international text");
+#endif
+            /* Mark this chunk as written */
+            info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
+         }
+         else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
+         {
+#ifdef PNG_WRITE_zTXt_SUPPORTED
+            /* Write compressed chunk */
+            png_write_zTXt(png_ptr, info_ptr->text[i].key,
+               info_ptr->text[i].text, 0,
+               info_ptr->text[i].compression);
+#else
+            png_warning(png_ptr, "Unable to write compressed text");
+#endif
+            /* Mark this chunk as written */
+            info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
+         }
+         else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
+         {
+#ifdef PNG_WRITE_tEXt_SUPPORTED
+            /* Write uncompressed chunk */
+            png_write_tEXt(png_ptr, info_ptr->text[i].key,
+               info_ptr->text[i].text, 0);
+#else
+            png_warning(png_ptr, "Unable to write uncompressed text");
+#endif
+
+            /* Mark this chunk as written */
+            info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
+         }
+      }
+#endif
+#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
+   if (info_ptr->unknown_chunks_num)
+   {
+      png_unknown_chunk *up;
+
+      png_debug(5, "writing extra chunks");
+
+      for (up = info_ptr->unknown_chunks;
+           up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
+           up++)
+      {
+         int keep = png_handle_as_unknown(png_ptr, up->name);
+         if (keep != PNG_HANDLE_CHUNK_NEVER &&
+            up->location && (up->location & PNG_AFTER_IDAT) &&
+            ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
+            (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
+         {
+            png_write_chunk(png_ptr, up->name, up->data, up->size);
+         }
+      }
+   }
+#endif
+   }
+
+   png_ptr->mode |= PNG_AFTER_IDAT;
+
+   /* Write end of PNG file */
+   png_write_IEND(png_ptr);
+   /* This flush, added in libpng-1.0.8, removed from libpng-1.0.9beta03,
+    * and restored again in libpng-1.2.30, may cause some applications that
+    * do not set png_ptr->output_flush_fn to crash.  If your application
+    * experiences a problem, please try building libpng with
+    * PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED defined, and report the event to
+    * png-mng-implement at lists.sf.net .
+    */
+#ifdef PNG_WRITE_FLUSH_SUPPORTED
+#  ifdef PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED
+   png_flush(png_ptr);
+#  endif
+#endif
+}
+
+#ifdef PNG_CONVERT_tIME_SUPPORTED
+/* "tm" structure is not supported on WindowsCE */
+void PNGAPI
+png_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime)
+{
+   png_debug(1, "in png_convert_from_struct_tm");
+
+   ptime->year = (png_uint_16)(1900 + ttime->tm_year);
+   ptime->month = (png_byte)(ttime->tm_mon + 1);
+   ptime->day = (png_byte)ttime->tm_mday;
+   ptime->hour = (png_byte)ttime->tm_hour;
+   ptime->minute = (png_byte)ttime->tm_min;
+   ptime->second = (png_byte)ttime->tm_sec;
+}
+
+void PNGAPI
+png_convert_from_time_t(png_timep ptime, time_t ttime)
+{
+   struct tm *tbuf;
+
+   png_debug(1, "in png_convert_from_time_t");
+
+   tbuf = gmtime(&ttime);
+   png_convert_from_struct_tm(ptime, tbuf);
+}
+#endif
+
+/* Initialize png_ptr structure, and allocate any memory needed */
+png_structp PNGAPI
+png_create_write_struct(png_const_charp user_png_ver, png_voidp error_ptr,
+   png_error_ptr error_fn, png_error_ptr warn_fn)
+{
+#ifdef PNG_USER_MEM_SUPPORTED
+   return (png_create_write_struct_2(user_png_ver, error_ptr, error_fn,
+      warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL));
+}
+
+/* Alternate initialize png_ptr structure, and allocate any memory needed */
+png_structp PNGAPI
+png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
+   png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
+   png_malloc_ptr malloc_fn, png_free_ptr free_fn)
+{
+#endif /* PNG_USER_MEM_SUPPORTED */
+#ifdef PNG_SETJMP_SUPPORTED
+   volatile
+#endif
+   png_structp png_ptr;
+#ifdef PNG_SETJMP_SUPPORTED
+#ifdef USE_FAR_KEYWORD
+   jmp_buf jmpbuf;
+#endif
+#endif
+   int i;
+
+   png_debug(1, "in png_create_write_struct");
+
+#ifdef PNG_USER_MEM_SUPPORTED
+   png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
+      (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
+#else
+   png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
+#endif /* PNG_USER_MEM_SUPPORTED */
+   if (png_ptr == NULL)
+      return (NULL);
+
+   /* Added at libpng-1.2.6 */
+#ifdef PNG_SET_USER_LIMITS_SUPPORTED
+   png_ptr->user_width_max = PNG_USER_WIDTH_MAX;
+   png_ptr->user_height_max = PNG_USER_HEIGHT_MAX;
+#endif
+
+#ifdef PNG_SETJMP_SUPPORTED
+#ifdef USE_FAR_KEYWORD
+   if (setjmp(jmpbuf))
+#else
+   if (setjmp(png_ptr->jmpbuf))
+#endif
+   {
+      png_free(png_ptr, png_ptr->zbuf);
+      png_ptr->zbuf = NULL;
+#ifdef PNG_USER_MEM_SUPPORTED
+      png_destroy_struct_2((png_voidp)png_ptr,
+         (png_free_ptr)free_fn, (png_voidp)mem_ptr);
+#else
+      png_destroy_struct((png_voidp)png_ptr);
+#endif
+      return (NULL);
+   }
+#ifdef USE_FAR_KEYWORD
+   png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
+#endif
+#endif
+
+#ifdef PNG_USER_MEM_SUPPORTED
+   png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
+#endif /* PNG_USER_MEM_SUPPORTED */
+   png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
+
+   if (user_png_ver)
+   {
+      i = 0;
+      do
+      {
+         if (user_png_ver[i] != png_libpng_ver[i])
+            png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+      } while (png_libpng_ver[i++]);
+   }
+
+   if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
+   {
+     /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
+      * we must recompile any applications that use any older library version.
+      * For versions after libpng 1.0, we will be compatible, so we need
+      * only check the first digit.
+      */
+     if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
+         (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
+         (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
+     {
+#if defined(PNG_STDIO_SUPPORTED) && !defined(_WIN32_WCE)
+        char msg[80];
+        if (user_png_ver)
+        {
+           png_snprintf(msg, 80,
+              "Application was compiled with png.h from libpng-%.20s",
+              user_png_ver);
+           png_warning(png_ptr, msg);
+        }
+        png_snprintf(msg, 80,
+           "Application  is  running with png.c from libpng-%.20s",
+           png_libpng_ver);
+        png_warning(png_ptr, msg);
+#endif
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+        png_ptr->flags = 0;
+#endif
+        png_error(png_ptr,
+           "Incompatible libpng version in application and library");
+     }
+   }
+
+   /* Initialize zbuf - compression buffer */
+   png_ptr->zbuf_size = PNG_ZBUF_SIZE;
+   png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
+     (png_uint_32)png_ptr->zbuf_size);
+
+   png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
+      png_flush_ptr_NULL);
+
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
+   png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
+      1, png_doublep_NULL, png_doublep_NULL);
+#endif
+
+#ifdef PNG_SETJMP_SUPPORTED
+   /* Applications that neglect to set up their own setjmp() and then
+    * encounter a png_error() will longjmp here.  Since the jmpbuf is
+    * then meaningless we abort instead of returning.
+    */
+#ifdef USE_FAR_KEYWORD
+   if (setjmp(jmpbuf))
+      PNG_ABORT();
+   png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
+#else
+   if (setjmp(png_ptr->jmpbuf))
+      PNG_ABORT();
+#endif
+#endif
+   return (png_ptr);
+}
+
+/* Initialize png_ptr structure, and allocate any memory needed */
+#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
+/* Deprecated. */
+#undef png_write_init
+void PNGAPI
+png_write_init(png_structp png_ptr)
+{
+   /* We only come here via pre-1.0.7-compiled applications */
+   png_write_init_2(png_ptr, "1.0.6 or earlier", 0, 0);
+}
+
+void PNGAPI
+png_write_init_2(png_structp png_ptr, png_const_charp user_png_ver,
+   png_size_t png_struct_size, png_size_t png_info_size)
+{
+   /* We only come here via pre-1.0.12-compiled applications */
+   if (png_ptr == NULL) return;
+#if defined(PNG_STDIO_SUPPORTED) && !defined(_WIN32_WCE)
+   if (png_sizeof(png_struct) > png_struct_size ||
+      png_sizeof(png_info) > png_info_size)
+   {
+      char msg[80];
+      png_ptr->warning_fn = NULL;
+      if (user_png_ver)
+      {
+         png_snprintf(msg, 80,
+            "Application was compiled with png.h from libpng-%.20s",
+            user_png_ver);
+         png_warning(png_ptr, msg);
+      }
+      png_snprintf(msg, 80,
+         "Application  is  running with png.c from libpng-%.20s",
+         png_libpng_ver);
+      png_warning(png_ptr, msg);
+   }
+#endif
+   if (png_sizeof(png_struct) > png_struct_size)
+   {
+      png_ptr->error_fn = NULL;
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+      png_ptr->flags = 0;
+#endif
+      png_error(png_ptr,
+      "The png struct allocated by the application for writing is"
+      " too small.");
+   }
+   if (png_sizeof(png_info) > png_info_size)
+   {
+      png_ptr->error_fn = NULL;
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+      png_ptr->flags = 0;
+#endif
+      png_error(png_ptr,
+      "The info struct allocated by the application for writing is"
+      " too small.");
+   }
+   png_write_init_3(&png_ptr, user_png_ver, png_struct_size);
+}
+#endif /* PNG_1_0_X || PNG_1_2_X */
+
+
+void PNGAPI
+png_write_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
+   png_size_t png_struct_size)
+{
+   png_structp png_ptr = *ptr_ptr;
+#ifdef PNG_SETJMP_SUPPORTED
+   jmp_buf tmp_jmp; /* to save current jump buffer */
+#endif
+
+   int i = 0;
+
+   if (png_ptr == NULL)
+      return;
+
+   do
+   {
+      if (user_png_ver[i] != png_libpng_ver[i])
+      {
+#ifdef PNG_LEGACY_SUPPORTED
+         png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+#else
+         png_ptr->warning_fn = NULL;
+         png_warning(png_ptr,
+ "Application uses deprecated png_write_init() and should be recompiled.");
+#endif
+      }
+   } while (png_libpng_ver[i++]);
+
+   png_debug(1, "in png_write_init_3");
+
+#ifdef PNG_SETJMP_SUPPORTED
+   /* Save jump buffer and error functions */
+   png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
+#endif
+
+   if (png_sizeof(png_struct) > png_struct_size)
+   {
+      png_destroy_struct(png_ptr);
+      png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
+      *ptr_ptr = png_ptr;
+   }
+
+   /* Reset all variables to 0 */
+   png_memset(png_ptr, 0, png_sizeof(png_struct));
+
+   /* Added at libpng-1.2.6 */
+#ifdef PNG_SET_USER_LIMITS_SUPPORTED
+   png_ptr->user_width_max = PNG_USER_WIDTH_MAX;
+   png_ptr->user_height_max = PNG_USER_HEIGHT_MAX;
+#endif
+
+#ifdef PNG_SETJMP_SUPPORTED
+   /* Restore jump buffer */
+   png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
+#endif
+
+   png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
+      png_flush_ptr_NULL);
+
+   /* Initialize zbuf - compression buffer */
+   png_ptr->zbuf_size = PNG_ZBUF_SIZE;
+   png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
+     (png_uint_32)png_ptr->zbuf_size);
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
+   png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
+      1, png_doublep_NULL, png_doublep_NULL);
+#endif
+}
+
+/* Write a few rows of image data.  If the image is interlaced,
+ * either you will have to write the 7 sub images, or, if you
+ * have called png_set_interlace_handling(), you will have to
+ * "write" the image seven times.
+ */
+void PNGAPI
+png_write_rows(png_structp png_ptr, png_bytepp row,
+   png_uint_32 num_rows)
+{
+   png_uint_32 i; /* row counter */
+   png_bytepp rp; /* row pointer */
+
+   png_debug(1, "in png_write_rows");
+
+   if (png_ptr == NULL)
+      return;
+
+   /* Loop through the rows */
+   for (i = 0, rp = row; i < num_rows; i++, rp++)
+   {
+      png_write_row(png_ptr, *rp);
+   }
+}
+
+/* Write the image.  You only need to call this function once, even
+ * if you are writing an interlaced image.
+ */
+void PNGAPI
+png_write_image(png_structp png_ptr, png_bytepp image)
+{
+   png_uint_32 i; /* row index */
+   int pass, num_pass; /* pass variables */
+   png_bytepp rp; /* points to current row */
+
+   if (png_ptr == NULL)
+      return;
+
+   png_debug(1, "in png_write_image");
+
+#ifdef PNG_WRITE_INTERLACING_SUPPORTED
+   /* Initialize interlace handling.  If image is not interlaced,
+    * this will set pass to 1
+    */
+   num_pass = png_set_interlace_handling(png_ptr);
+#else
+   num_pass = 1;
+#endif
+   /* Loop through passes */
+   for (pass = 0; pass < num_pass; pass++)
+   {
+      /* Loop through image */
+      for (i = 0, rp = image; i < png_ptr->height; i++, rp++)
+      {
+         png_write_row(png_ptr, *rp);
+      }
+   }
+}
+
+/* Called by user to write a row of image data */
+void PNGAPI
+png_write_row(png_structp png_ptr, png_bytep row)
+{
+   if (png_ptr == NULL)
+      return;
+
+   png_debug2(1, "in png_write_row (row %ld, pass %d)",
+      png_ptr->row_number, png_ptr->pass);
+
+   /* Initialize transformations and other stuff if first time */
+   if (png_ptr->row_number == 0 && png_ptr->pass == 0)
+   {
+      /* Make sure we wrote the header info */
+      if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
+         png_error(png_ptr,
+            "png_write_info was never called before png_write_row.");
+
+      /* Check for transforms that have been set but were defined out */
+#if !defined(PNG_WRITE_INVERT_SUPPORTED) && defined(PNG_READ_INVERT_SUPPORTED)
+      if (png_ptr->transformations & PNG_INVERT_MONO)
+         png_warning(png_ptr,
+             "PNG_WRITE_INVERT_SUPPORTED is not defined.");
+#endif
+#if !defined(PNG_WRITE_FILLER_SUPPORTED) && defined(PNG_READ_FILLER_SUPPORTED)
+      if (png_ptr->transformations & PNG_FILLER)
+         png_warning(png_ptr,
+             "PNG_WRITE_FILLER_SUPPORTED is not defined.");
+#endif
+#if !defined(PNG_WRITE_PACKSWAP_SUPPORTED) && \
+    defined(PNG_READ_PACKSWAP_SUPPORTED)
+      if (png_ptr->transformations & PNG_PACKSWAP)
+         png_warning(png_ptr,
+             "PNG_WRITE_PACKSWAP_SUPPORTED is not defined.");
+#endif
+#if !defined(PNG_WRITE_PACK_SUPPORTED) && defined(PNG_READ_PACK_SUPPORTED)
+      if (png_ptr->transformations & PNG_PACK)
+         png_warning(png_ptr, "PNG_WRITE_PACK_SUPPORTED is not defined.");
+#endif
+#if !defined(PNG_WRITE_SHIFT_SUPPORTED) && defined(PNG_READ_SHIFT_SUPPORTED)
+      if (png_ptr->transformations & PNG_SHIFT)
+         png_warning(png_ptr, "PNG_WRITE_SHIFT_SUPPORTED is not defined.");
+#endif
+#if !defined(PNG_WRITE_BGR_SUPPORTED) && defined(PNG_READ_BGR_SUPPORTED)
+      if (png_ptr->transformations & PNG_BGR)
+         png_warning(png_ptr, "PNG_WRITE_BGR_SUPPORTED is not defined.");
+#endif
+#if !defined(PNG_WRITE_SWAP_SUPPORTED) && defined(PNG_READ_SWAP_SUPPORTED)
+      if (png_ptr->transformations & PNG_SWAP_BYTES)
+         png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined.");
+#endif
+
+      png_write_start_row(png_ptr);
+   }
+
+#ifdef PNG_WRITE_INTERLACING_SUPPORTED
+   /* If interlaced and not interested in row, return */
+   if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
+   {
+      switch (png_ptr->pass)
+      {
+         case 0:
+            if (png_ptr->row_number & 0x07)
+            {
+               png_write_finish_row(png_ptr);
+               return;
+            }
+            break;
+         case 1:
+            if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
+            {
+               png_write_finish_row(png_ptr);
+               return;
+            }
+            break;
+         case 2:
+            if ((png_ptr->row_number & 0x07) != 4)
+            {
+               png_write_finish_row(png_ptr);
+               return;
+            }
+            break;
+         case 3:
+            if ((png_ptr->row_number & 0x03) || png_ptr->width < 3)
+            {
+               png_write_finish_row(png_ptr);
+               return;
+            }
+            break;
+         case 4:
+            if ((png_ptr->row_number & 0x03) != 2)
+            {
+               png_write_finish_row(png_ptr);
+               return;
+            }
+            break;
+         case 5:
+            if ((png_ptr->row_number & 0x01) || png_ptr->width < 2)
+            {
+               png_write_finish_row(png_ptr);
+               return;
+            }
+            break;
+         case 6:
+            if (!(png_ptr->row_number & 0x01))
+            {
+               png_write_finish_row(png_ptr);
+               return;
+            }
+            break;
+      }
+   }
+#endif
+
+   /* Set up row info for transformations */
+   png_ptr->row_info.color_type = png_ptr->color_type;
+   png_ptr->row_info.width = png_ptr->usr_width;
+   png_ptr->row_info.channels = png_ptr->usr_channels;
+   png_ptr->row_info.bit_depth = png_ptr->usr_bit_depth;
+   png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth *
+      png_ptr->row_info.channels);
+
+   png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
+      png_ptr->row_info.width);
+
+   png_debug1(3, "row_info->color_type = %d", png_ptr->row_info.color_type);
+   png_debug1(3, "row_info->width = %lu", png_ptr->row_info.width);
+   png_debug1(3, "row_info->channels = %d", png_ptr->row_info.channels);
+   png_debug1(3, "row_info->bit_depth = %d", png_ptr->row_info.bit_depth);
+   png_debug1(3, "row_info->pixel_depth = %d", png_ptr->row_info.pixel_depth);
+   png_debug1(3, "row_info->rowbytes = %lu", png_ptr->row_info.rowbytes);
+
+   /* Copy user's row into buffer, leaving room for filter byte. */
+   png_memcpy_check(png_ptr, png_ptr->row_buf + 1, row,
+      png_ptr->row_info.rowbytes);
+
+#ifdef PNG_WRITE_INTERLACING_SUPPORTED
+   /* Handle interlacing */
+   if (png_ptr->interlaced && png_ptr->pass < 6 &&
+      (png_ptr->transformations & PNG_INTERLACE))
+   {
+      png_do_write_interlace(&(png_ptr->row_info),
+         png_ptr->row_buf + 1, png_ptr->pass);
+      /* This should always get caught above, but still ... */
+      if (!(png_ptr->row_info.width))
+      {
+         png_write_finish_row(png_ptr);
+         return;
+      }
+   }
+#endif
+
+   /* Handle other transformations */
+   if (png_ptr->transformations)
+      png_do_write_transformations(png_ptr);
+
+#ifdef PNG_MNG_FEATURES_SUPPORTED
+   /* Write filter_method 64 (intrapixel differencing) only if
+    * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
+    * 2. Libpng did not write a PNG signature (this filter_method is only
+    *    used in PNG datastreams that are embedded in MNG datastreams) and
+    * 3. The application called png_permit_mng_features with a mask that
+    *    included PNG_FLAG_MNG_FILTER_64 and
+    * 4. The filter_method is 64 and
+    * 5. The color_type is RGB or RGBA
+    */
+   if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+      (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
+   {
+      /* Intrapixel differencing */
+      png_do_write_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
+   }
+#endif
+
+   /* Find a filter if necessary, filter the row and write it out. */
+   png_write_find_filter(png_ptr, &(png_ptr->row_info));
+
+   if (png_ptr->write_row_fn != NULL)
+      (*(png_ptr->write_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
+}
+
+#ifdef PNG_WRITE_FLUSH_SUPPORTED
+/* Set the automatic flush interval or 0 to turn flushing off */
+void PNGAPI
+png_set_flush(png_structp png_ptr, int nrows)
+{
+   png_debug(1, "in png_set_flush");
+
+   if (png_ptr == NULL)
+      return;
+   png_ptr->flush_dist = (nrows < 0 ? 0 : nrows);
+}
+
+/* Flush the current output buffers now */
+void PNGAPI
+png_write_flush(png_structp png_ptr)
+{
+   int wrote_IDAT;
+
+   png_debug(1, "in png_write_flush");
+
+   if (png_ptr == NULL)
+      return;
+   /* We have already written out all of the data */
+   if (png_ptr->row_number >= png_ptr->num_rows)
+      return;
+
+   do
+   {
+      int ret;
+
+      /* Compress the data */
+      ret = deflate(&png_ptr->zstream, Z_SYNC_FLUSH);
+      wrote_IDAT = 0;
+
+      /* Check for compression errors */
+      if (ret != Z_OK)
+      {
+         if (png_ptr->zstream.msg != NULL)
+            png_error(png_ptr, png_ptr->zstream.msg);
+         else
+            png_error(png_ptr, "zlib error");
+      }
+
+      if (!(png_ptr->zstream.avail_out))
+      {
+         /* Write the IDAT and reset the zlib output buffer */
+         png_write_IDAT(png_ptr, png_ptr->zbuf,
+                        png_ptr->zbuf_size);
+         png_ptr->zstream.next_out = png_ptr->zbuf;
+         png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+         wrote_IDAT = 1;
+      }
+   } while(wrote_IDAT == 1);
+
+   /* If there is any data left to be output, write it into a new IDAT */
+   if (png_ptr->zbuf_size != png_ptr->zstream.avail_out)
+   {
+      /* Write the IDAT and reset the zlib output buffer */
+      png_write_IDAT(png_ptr, png_ptr->zbuf,
+                     png_ptr->zbuf_size - png_ptr->zstream.avail_out);
+      png_ptr->zstream.next_out = png_ptr->zbuf;
+      png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+   }
+   png_ptr->flush_rows = 0;
+   png_flush(png_ptr);
+}
+#endif /* PNG_WRITE_FLUSH_SUPPORTED */
+
+/* Free all memory used by the write */
+void PNGAPI
+png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
+{
+   png_structp png_ptr = NULL;
+   png_infop info_ptr = NULL;
+#ifdef PNG_USER_MEM_SUPPORTED
+   png_free_ptr free_fn = NULL;
+   png_voidp mem_ptr = NULL;
+#endif
+
+   png_debug(1, "in png_destroy_write_struct");
+
+   if (png_ptr_ptr != NULL)
+   {
+      png_ptr = *png_ptr_ptr;
+#ifdef PNG_USER_MEM_SUPPORTED
+      free_fn = png_ptr->free_fn;
+      mem_ptr = png_ptr->mem_ptr;
+#endif
+   }
+
+#ifdef PNG_USER_MEM_SUPPORTED
+   if (png_ptr != NULL)
+   {
+      free_fn = png_ptr->free_fn;
+      mem_ptr = png_ptr->mem_ptr;
+   }
+#endif
+
+   if (info_ptr_ptr != NULL)
+      info_ptr = *info_ptr_ptr;
+
+   if (info_ptr != NULL)
+   {
+      if (png_ptr != NULL)
+      {
+        png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
+
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+        if (png_ptr->num_chunk_list)
+        {
+           png_free(png_ptr, png_ptr->chunk_list);
+           png_ptr->chunk_list = NULL;
+           png_ptr->num_chunk_list = 0;
+        }
+#endif
+      }
+
+#ifdef PNG_USER_MEM_SUPPORTED
+      png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
+         (png_voidp)mem_ptr);
+#else
+      png_destroy_struct((png_voidp)info_ptr);
+#endif
+      *info_ptr_ptr = NULL;
+   }
+
+   if (png_ptr != NULL)
+   {
+      png_write_destroy(png_ptr);
+#ifdef PNG_USER_MEM_SUPPORTED
+      png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,
+         (png_voidp)mem_ptr);
+#else
+      png_destroy_struct((png_voidp)png_ptr);
+#endif
+      *png_ptr_ptr = NULL;
+   }
+}
+
+
+/* Free any memory used in png_ptr struct (old method) */
+void /* PRIVATE */
+png_write_destroy(png_structp png_ptr)
+{
+#ifdef PNG_SETJMP_SUPPORTED
+   jmp_buf tmp_jmp; /* Save jump buffer */
+#endif
+   png_error_ptr error_fn;
+   png_error_ptr warning_fn;
+   png_voidp error_ptr;
+#ifdef PNG_USER_MEM_SUPPORTED
+   png_free_ptr free_fn;
+#endif
+
+   png_debug(1, "in png_write_destroy");
+
+   /* Free any memory zlib uses */
+   deflateEnd(&png_ptr->zstream);
+
+   /* Free our memory.  png_free checks NULL for us. */
+   png_free(png_ptr, png_ptr->zbuf);
+   png_free(png_ptr, png_ptr->row_buf);
+#ifdef PNG_WRITE_FILTER_SUPPORTED
+   png_free(png_ptr, png_ptr->prev_row);
+   png_free(png_ptr, png_ptr->sub_row);
+   png_free(png_ptr, png_ptr->up_row);
+   png_free(png_ptr, png_ptr->avg_row);
+   png_free(png_ptr, png_ptr->paeth_row);
+#endif
+
+#ifdef PNG_TIME_RFC1123_SUPPORTED
+   png_free(png_ptr, png_ptr->time_buffer);
+#endif
+
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
+   png_free(png_ptr, png_ptr->prev_filters);
+   png_free(png_ptr, png_ptr->filter_weights);
+   png_free(png_ptr, png_ptr->inv_filter_weights);
+   png_free(png_ptr, png_ptr->filter_costs);
+   png_free(png_ptr, png_ptr->inv_filter_costs);
+#endif
+
+#ifdef PNG_SETJMP_SUPPORTED
+   /* Reset structure */
+   png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
+#endif
+
+   error_fn = png_ptr->error_fn;
+   warning_fn = png_ptr->warning_fn;
+   error_ptr = png_ptr->error_ptr;
+#ifdef PNG_USER_MEM_SUPPORTED
+   free_fn = png_ptr->free_fn;
+#endif
+
+   png_memset(png_ptr, 0, png_sizeof(png_struct));
+
+   png_ptr->error_fn = error_fn;
+   png_ptr->warning_fn = warning_fn;
+   png_ptr->error_ptr = error_ptr;
+#ifdef PNG_USER_MEM_SUPPORTED
+   png_ptr->free_fn = free_fn;
+#endif
+
+#ifdef PNG_SETJMP_SUPPORTED
+   png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
+#endif
+}
+
+/* Allow the application to select one or more row filters to use. */
+void PNGAPI
+png_set_filter(png_structp png_ptr, int method, int filters)
+{
+   png_debug(1, "in png_set_filter");
+
+   if (png_ptr == NULL)
+      return;
+#ifdef PNG_MNG_FEATURES_SUPPORTED
+   if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+      (method == PNG_INTRAPIXEL_DIFFERENCING))
+         method = PNG_FILTER_TYPE_BASE;
+#endif
+   if (method == PNG_FILTER_TYPE_BASE)
+   {
+      switch (filters & (PNG_ALL_FILTERS | 0x07))
+      {
+#ifdef PNG_WRITE_FILTER_SUPPORTED
+         case 5:
+         case 6:
+         case 7: png_warning(png_ptr, "Unknown row filter for method 0");
+#endif /* PNG_WRITE_FILTER_SUPPORTED */
+         case PNG_FILTER_VALUE_NONE:
+              png_ptr->do_filter = PNG_FILTER_NONE; break;
+#ifdef PNG_WRITE_FILTER_SUPPORTED
+         case PNG_FILTER_VALUE_SUB:
+              png_ptr->do_filter = PNG_FILTER_SUB; break;
+         case PNG_FILTER_VALUE_UP:
+              png_ptr->do_filter = PNG_FILTER_UP; break;
+         case PNG_FILTER_VALUE_AVG:
+              png_ptr->do_filter = PNG_FILTER_AVG; break;
+         case PNG_FILTER_VALUE_PAETH:
+              png_ptr->do_filter = PNG_FILTER_PAETH; break;
+         default: png_ptr->do_filter = (png_byte)filters; break;
+#else
+         default: png_warning(png_ptr, "Unknown row filter for method 0");
+#endif /* PNG_WRITE_FILTER_SUPPORTED */
+      }
+
+      /* If we have allocated the row_buf, this means we have already started
+       * with the image and we should have allocated all of the filter buffers
+       * that have been selected.  If prev_row isn't already allocated, then
+       * it is too late to start using the filters that need it, since we
+       * will be missing the data in the previous row.  If an application
+       * wants to start and stop using particular filters during compression,
+       * it should start out with all of the filters, and then add and
+       * remove them after the start of compression.
+       */
+      if (png_ptr->row_buf != NULL)
+      {
+#ifdef PNG_WRITE_FILTER_SUPPORTED
+         if ((png_ptr->do_filter & PNG_FILTER_SUB) && png_ptr->sub_row == NULL)
+         {
+            png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,
+              (png_ptr->rowbytes + 1));
+            png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;
+         }
+
+         if ((png_ptr->do_filter & PNG_FILTER_UP) && png_ptr->up_row == NULL)
+         {
+            if (png_ptr->prev_row == NULL)
+            {
+               png_warning(png_ptr, "Can't add Up filter after starting");
+               png_ptr->do_filter &= ~PNG_FILTER_UP;
+            }
+            else
+            {
+               png_ptr->up_row = (png_bytep)png_malloc(png_ptr,
+                  (png_ptr->rowbytes + 1));
+               png_ptr->up_row[0] = PNG_FILTER_VALUE_UP;
+            }
+         }
+
+         if ((png_ptr->do_filter & PNG_FILTER_AVG) && png_ptr->avg_row == NULL)
+         {
+            if (png_ptr->prev_row == NULL)
+            {
+               png_warning(png_ptr, "Can't add Average filter after starting");
+               png_ptr->do_filter &= ~PNG_FILTER_AVG;
+            }
+            else
+            {
+               png_ptr->avg_row = (png_bytep)png_malloc(png_ptr,
+                  (png_ptr->rowbytes + 1));
+               png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG;
+            }
+         }
+
+         if ((png_ptr->do_filter & PNG_FILTER_PAETH) &&
+             png_ptr->paeth_row == NULL)
+         {
+            if (png_ptr->prev_row == NULL)
+            {
+               png_warning(png_ptr, "Can't add Paeth filter after starting");
+               png_ptr->do_filter &= (png_byte)(~PNG_FILTER_PAETH);
+            }
+            else
+            {
+               png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr,
+                  (png_ptr->rowbytes + 1));
+               png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;
+            }
+         }
+
+         if (png_ptr->do_filter == PNG_NO_FILTERS)
+#endif /* PNG_WRITE_FILTER_SUPPORTED */
+            png_ptr->do_filter = PNG_FILTER_NONE;
+      }
+   }
+   else
+      png_error(png_ptr, "Unknown custom filter method");
+}
+
+/* This allows us to influence the way in which libpng chooses the "best"
+ * filter for the current scanline.  While the "minimum-sum-of-absolute-
+ * differences metric is relatively fast and effective, there is some
+ * question as to whether it can be improved upon by trying to keep the
+ * filtered data going to zlib more consistent, hopefully resulting in
+ * better compression.
+ */
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED      /* GRR 970116 */
+void PNGAPI
+png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
+   int num_weights, png_doublep filter_weights,
+   png_doublep filter_costs)
+{
+   int i;
+
+   png_debug(1, "in png_set_filter_heuristics");
+
+   if (png_ptr == NULL)
+      return;
+   if (heuristic_method >= PNG_FILTER_HEURISTIC_LAST)
+   {
+      png_warning(png_ptr, "Unknown filter heuristic method");
+      return;
+   }
+
+   if (heuristic_method == PNG_FILTER_HEURISTIC_DEFAULT)
+   {
+      heuristic_method = PNG_FILTER_HEURISTIC_UNWEIGHTED;
+   }
+
+   if (num_weights < 0 || filter_weights == NULL ||
+      heuristic_method == PNG_FILTER_HEURISTIC_UNWEIGHTED)
+   {
+      num_weights = 0;
+   }
+
+   png_ptr->num_prev_filters = (png_byte)num_weights;
+   png_ptr->heuristic_method = (png_byte)heuristic_method;
+
+   if (num_weights > 0)
+   {
+      if (png_ptr->prev_filters == NULL)
+      {
+         png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr,
+            (png_uint_32)(png_sizeof(png_byte) * num_weights));
+
+         /* To make sure that the weighting starts out fairly */
+         for (i = 0; i < num_weights; i++)
+         {
+            png_ptr->prev_filters[i] = 255;
+         }
+      }
+
+      if (png_ptr->filter_weights == NULL)
+      {
+         png_ptr->filter_weights = (png_uint_16p)png_malloc(png_ptr,
+            (png_uint_32)(png_sizeof(png_uint_16) * num_weights));
+
+         png_ptr->inv_filter_weights = (png_uint_16p)png_malloc(png_ptr,
+            (png_uint_32)(png_sizeof(png_uint_16) * num_weights));
+         for (i = 0; i < num_weights; i++)
+         {
+            png_ptr->inv_filter_weights[i] =
+            png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
+         }
+      }
+
+      for (i = 0; i < num_weights; i++)
+      {
+         if (filter_weights[i] < 0.0)
+         {
+            png_ptr->inv_filter_weights[i] =
+            png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
+         }
+         else
+         {
+            png_ptr->inv_filter_weights[i] =
+               (png_uint_16)((double)PNG_WEIGHT_FACTOR*filter_weights[i]+0.5);
+            png_ptr->filter_weights[i] =
+               (png_uint_16)((double)PNG_WEIGHT_FACTOR/filter_weights[i]+0.5);
+         }
+      }
+   }
+
+   /* If, in the future, there are other filter methods, this would
+    * need to be based on png_ptr->filter.
+    */
+   if (png_ptr->filter_costs == NULL)
+   {
+      png_ptr->filter_costs = (png_uint_16p)png_malloc(png_ptr,
+         (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
+
+      png_ptr->inv_filter_costs = (png_uint_16p)png_malloc(png_ptr,
+         (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
+
+      for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
+      {
+         png_ptr->inv_filter_costs[i] =
+         png_ptr->filter_costs[i] = PNG_COST_FACTOR;
+      }
+   }
+
+   /* Here is where we set the relative costs of the different filters.  We
+    * should take the desired compression level into account when setting
+    * the costs, so that Paeth, for instance, has a high relative cost at low
+    * compression levels, while it has a lower relative cost at higher
+    * compression settings.  The filter types are in order of increasing
+    * relative cost, so it would be possible to do this with an algorithm.
+    */
+   for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
+   {
+      if (filter_costs == NULL || filter_costs[i] < 0.0)
+      {
+         png_ptr->inv_filter_costs[i] =
+         png_ptr->filter_costs[i] = PNG_COST_FACTOR;
+      }
+      else if (filter_costs[i] >= 1.0)
+      {
+         png_ptr->inv_filter_costs[i] =
+            (png_uint_16)((double)PNG_COST_FACTOR / filter_costs[i] + 0.5);
+         png_ptr->filter_costs[i] =
+            (png_uint_16)((double)PNG_COST_FACTOR * filter_costs[i] + 0.5);
+      }
+   }
+}
+#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
+
+void PNGAPI
+png_set_compression_level(png_structp png_ptr, int level)
+{
+   png_debug(1, "in png_set_compression_level");
+
+   if (png_ptr == NULL)
+      return;
+   png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_LEVEL;
+   png_ptr->zlib_level = level;
+}
+
+void PNGAPI
+png_set_compression_mem_level(png_structp png_ptr, int mem_level)
+{
+   png_debug(1, "in png_set_compression_mem_level");
+
+   if (png_ptr == NULL)
+      return;
+   png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL;
+   png_ptr->zlib_mem_level = mem_level;
+}
+
+void PNGAPI
+png_set_compression_strategy(png_structp png_ptr, int strategy)
+{
+   png_debug(1, "in png_set_compression_strategy");
+
+   if (png_ptr == NULL)
+      return;
+   png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY;
+   png_ptr->zlib_strategy = strategy;
+}
+
+void PNGAPI
+png_set_compression_window_bits(png_structp png_ptr, int window_bits)
+{
+   if (png_ptr == NULL)
+      return;
+   if (window_bits > 15)
+      png_warning(png_ptr, "Only compression windows <= 32k supported by PNG");
+   else if (window_bits < 8)
+      png_warning(png_ptr, "Only compression windows >= 256 supported by PNG");
+#ifndef WBITS_8_OK
+   /* Avoid libpng bug with 256-byte windows */
+   if (window_bits == 8)
+     {
+       png_warning(png_ptr, "Compression window is being reset to 512");
+       window_bits = 9;
+     }
+#endif
+   png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS;
+   png_ptr->zlib_window_bits = window_bits;
+}
+
+void PNGAPI
+png_set_compression_method(png_structp png_ptr, int method)
+{
+   png_debug(1, "in png_set_compression_method");
+
+   if (png_ptr == NULL)
+      return;
+   if (method != 8)
+      png_warning(png_ptr, "Only compression method 8 is supported by PNG");
+   png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_METHOD;
+   png_ptr->zlib_method = method;
+}
+
+void PNGAPI
+png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn)
+{
+   if (png_ptr == NULL)
+      return;
+   png_ptr->write_row_fn = write_row_fn;
+}
+
+#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
+void PNGAPI
+png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
+   write_user_transform_fn)
+{
+   png_debug(1, "in png_set_write_user_transform_fn");
+
+   if (png_ptr == NULL)
+      return;
+   png_ptr->transformations |= PNG_USER_TRANSFORM;
+   png_ptr->write_user_transform_fn = write_user_transform_fn;
+}
+#endif
+
+
+#ifdef PNG_INFO_IMAGE_SUPPORTED
+void PNGAPI
+png_write_png(png_structp png_ptr, png_infop info_ptr,
+              int transforms, voidp params)
+{
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   /* Write the file header information. */
+   png_write_info(png_ptr, info_ptr);
+
+   /* ------ these transformations don't touch the info structure ------- */
+
+#ifdef PNG_WRITE_INVERT_SUPPORTED
+   /* Invert monochrome pixels */
+   if (transforms & PNG_TRANSFORM_INVERT_MONO)
+      png_set_invert_mono(png_ptr);
+#endif
+
+#ifdef PNG_WRITE_SHIFT_SUPPORTED
+   /* Shift the pixels up to a legal bit depth and fill in
+    * as appropriate to correctly scale the image.
+    */
+   if ((transforms & PNG_TRANSFORM_SHIFT)
+               && (info_ptr->valid & PNG_INFO_sBIT))
+      png_set_shift(png_ptr, &info_ptr->sig_bit);
+#endif
+
+#ifdef PNG_WRITE_PACK_SUPPORTED
+   /* Pack pixels into bytes */
+   if (transforms & PNG_TRANSFORM_PACKING)
+       png_set_packing(png_ptr);
+#endif
+
+#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
+   /* Swap location of alpha bytes from ARGB to RGBA */
+   if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
+      png_set_swap_alpha(png_ptr);
+#endif
+
+#ifdef PNG_WRITE_FILLER_SUPPORTED
+   /* Pack XRGB/RGBX/ARGB/RGBA into * RGB (4 channels -> 3 channels) */
+   if (transforms & PNG_TRANSFORM_STRIP_FILLER_AFTER)
+      png_set_filler(png_ptr, 0, PNG_FILLER_AFTER);
+   else if (transforms & PNG_TRANSFORM_STRIP_FILLER_BEFORE)
+      png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
+#endif
+
+#ifdef PNG_WRITE_BGR_SUPPORTED
+   /* Flip BGR pixels to RGB */
+   if (transforms & PNG_TRANSFORM_BGR)
+      png_set_bgr(png_ptr);
+#endif
+
+#ifdef PNG_WRITE_SWAP_SUPPORTED
+   /* Swap bytes of 16-bit files to most significant byte first */
+   if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
+      png_set_swap(png_ptr);
+#endif
+
+#ifdef PNG_WRITE_PACKSWAP_SUPPORTED
+   /* Swap bits of 1, 2, 4 bit packed pixel formats */
+   if (transforms & PNG_TRANSFORM_PACKSWAP)
+      png_set_packswap(png_ptr);
+#endif
+
+#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
+   /* Invert the alpha channel from opacity to transparency */
+   if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
+      png_set_invert_alpha(png_ptr);
+#endif
+
+   /* ----------------------- end of transformations ------------------- */
+
+   /* Write the bits */
+   if (info_ptr->valid & PNG_INFO_IDAT)
+       png_write_image(png_ptr, info_ptr->row_pointers);
+
+   /* It is REQUIRED to call this to finish writing the rest of the file */
+   png_write_end(png_ptr, info_ptr);
+
+   transforms = transforms; /* Quiet compiler warnings */
+   params = params;
+}
+#endif
+#endif /* PNG_WRITE_SUPPORTED */
diff --git a/src/libpng/pngwtran.c b/src/libpng/pngwtran.c
new file mode 100644
index 0000000..0ce9b9b
--- /dev/null
+++ b/src/libpng/pngwtran.c
@@ -0,0 +1,582 @@
+
+/* pngwtran.c - transforms the data in a row for PNG writers
+ *
+ * Last changed in libpng 1.2.43 [February 25, 2010]
+ * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ */
+
+#define PNG_INTERNAL
+#define PNG_NO_PEDANTIC_WARNINGS
+#include "png.h"
+#ifdef PNG_WRITE_SUPPORTED
+
+/* Transform the data according to the user's wishes.  The order of
+ * transformations is significant.
+ */
+void /* PRIVATE */
+png_do_write_transformations(png_structp png_ptr)
+{
+   png_debug(1, "in png_do_write_transformations");
+
+   if (png_ptr == NULL)
+      return;
+
+#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
+   if (png_ptr->transformations & PNG_USER_TRANSFORM)
+      if (png_ptr->write_user_transform_fn != NULL)
+        (*(png_ptr->write_user_transform_fn)) /* User write transform
+                                                 function */
+          (png_ptr,                    /* png_ptr */
+           &(png_ptr->row_info),       /* row_info:     */
+             /*  png_uint_32 width;          width of row */
+             /*  png_uint_32 rowbytes;       number of bytes in row */
+             /*  png_byte color_type;        color type of pixels */
+             /*  png_byte bit_depth;         bit depth of samples */
+             /*  png_byte channels;          number of channels (1-4) */
+             /*  png_byte pixel_depth;       bits per pixel (depth*channels) */
+           png_ptr->row_buf + 1);      /* start of pixel data for row */
+#endif
+#ifdef PNG_WRITE_FILLER_SUPPORTED
+   if (png_ptr->transformations & PNG_FILLER)
+      png_do_strip_filler(&(png_ptr->row_info), png_ptr->row_buf + 1,
+         png_ptr->flags);
+#endif
+#ifdef PNG_WRITE_PACKSWAP_SUPPORTED
+   if (png_ptr->transformations & PNG_PACKSWAP)
+      png_do_packswap(&(png_ptr->row_info), png_ptr->row_buf + 1);
+#endif
+#ifdef PNG_WRITE_PACK_SUPPORTED
+   if (png_ptr->transformations & PNG_PACK)
+      png_do_pack(&(png_ptr->row_info), png_ptr->row_buf + 1,
+         (png_uint_32)png_ptr->bit_depth);
+#endif
+#ifdef PNG_WRITE_SWAP_SUPPORTED
+   if (png_ptr->transformations & PNG_SWAP_BYTES)
+      png_do_swap(&(png_ptr->row_info), png_ptr->row_buf + 1);
+#endif
+#ifdef PNG_WRITE_SHIFT_SUPPORTED
+   if (png_ptr->transformations & PNG_SHIFT)
+      png_do_shift(&(png_ptr->row_info), png_ptr->row_buf + 1,
+         &(png_ptr->shift));
+#endif
+#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
+   if (png_ptr->transformations & PNG_SWAP_ALPHA)
+      png_do_write_swap_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1);
+#endif
+#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
+   if (png_ptr->transformations & PNG_INVERT_ALPHA)
+      png_do_write_invert_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1);
+#endif
+#ifdef PNG_WRITE_BGR_SUPPORTED
+   if (png_ptr->transformations & PNG_BGR)
+      png_do_bgr(&(png_ptr->row_info), png_ptr->row_buf + 1);
+#endif
+#ifdef PNG_WRITE_INVERT_SUPPORTED
+   if (png_ptr->transformations & PNG_INVERT_MONO)
+      png_do_invert(&(png_ptr->row_info), png_ptr->row_buf + 1);
+#endif
+}
+
+#ifdef PNG_WRITE_PACK_SUPPORTED
+/* Pack pixels into bytes.  Pass the true bit depth in bit_depth.  The
+ * row_info bit depth should be 8 (one pixel per byte).  The channels
+ * should be 1 (this only happens on grayscale and paletted images).
+ */
+void /* PRIVATE */
+png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
+{
+   png_debug(1, "in png_do_pack");
+
+   if (row_info->bit_depth == 8 &&
+#ifdef PNG_USELESS_TESTS_SUPPORTED
+       row != NULL && row_info != NULL &&
+#endif
+      row_info->channels == 1)
+   {
+      switch ((int)bit_depth)
+      {
+         case 1:
+         {
+            png_bytep sp, dp;
+            int mask, v;
+            png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
+
+            sp = row;
+            dp = row;
+            mask = 0x80;
+            v = 0;
+
+            for (i = 0; i < row_width; i++)
+            {
+               if (*sp != 0)
+                  v |= mask;
+               sp++;
+               if (mask > 1)
+                  mask >>= 1;
+               else
+               {
+                  mask = 0x80;
+                  *dp = (png_byte)v;
+                  dp++;
+                  v = 0;
+               }
+            }
+            if (mask != 0x80)
+               *dp = (png_byte)v;
+            break;
+         }
+         case 2:
+         {
+            png_bytep sp, dp;
+            int shift, v;
+            png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
+
+            sp = row;
+            dp = row;
+            shift = 6;
+            v = 0;
+            for (i = 0; i < row_width; i++)
+            {
+               png_byte value;
+
+               value = (png_byte)(*sp & 0x03);
+               v |= (value << shift);
+               if (shift == 0)
+               {
+                  shift = 6;
+                  *dp = (png_byte)v;
+                  dp++;
+                  v = 0;
+               }
+               else
+                  shift -= 2;
+               sp++;
+            }
+            if (shift != 6)
+               *dp = (png_byte)v;
+            break;
+         }
+         case 4:
+         {
+            png_bytep sp, dp;
+            int shift, v;
+            png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
+
+            sp = row;
+            dp = row;
+            shift = 4;
+            v = 0;
+            for (i = 0; i < row_width; i++)
+            {
+               png_byte value;
+
+               value = (png_byte)(*sp & 0x0f);
+               v |= (value << shift);
+
+               if (shift == 0)
+               {
+                  shift = 4;
+                  *dp = (png_byte)v;
+                  dp++;
+                  v = 0;
+               }
+               else
+                  shift -= 4;
+
+               sp++;
+            }
+            if (shift != 4)
+               *dp = (png_byte)v;
+            break;
+         }
+      }
+      row_info->bit_depth = (png_byte)bit_depth;
+      row_info->pixel_depth = (png_byte)(bit_depth * row_info->channels);
+      row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth,
+         row_info->width);
+   }
+}
+#endif
+
+#ifdef PNG_WRITE_SHIFT_SUPPORTED
+/* Shift pixel values to take advantage of whole range.  Pass the
+ * true number of bits in bit_depth.  The row should be packed
+ * according to row_info->bit_depth.  Thus, if you had a row of
+ * bit depth 4, but the pixels only had values from 0 to 7, you
+ * would pass 3 as bit_depth, and this routine would translate the
+ * data to 0 to 15.
+ */
+void /* PRIVATE */
+png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
+{
+   png_debug(1, "in png_do_shift");
+
+#ifdef PNG_USELESS_TESTS_SUPPORTED
+   if (row != NULL && row_info != NULL &&
+#else
+   if (
+#endif
+      row_info->color_type != PNG_COLOR_TYPE_PALETTE)
+   {
+      int shift_start[4], shift_dec[4];
+      int channels = 0;
+
+      if (row_info->color_type & PNG_COLOR_MASK_COLOR)
+      {
+         shift_start[channels] = row_info->bit_depth - bit_depth->red;
+         shift_dec[channels] = bit_depth->red;
+         channels++;
+         shift_start[channels] = row_info->bit_depth - bit_depth->green;
+         shift_dec[channels] = bit_depth->green;
+         channels++;
+         shift_start[channels] = row_info->bit_depth - bit_depth->blue;
+         shift_dec[channels] = bit_depth->blue;
+         channels++;
+      }
+      else
+      {
+         shift_start[channels] = row_info->bit_depth - bit_depth->gray;
+         shift_dec[channels] = bit_depth->gray;
+         channels++;
+      }
+      if (row_info->color_type & PNG_COLOR_MASK_ALPHA)
+      {
+         shift_start[channels] = row_info->bit_depth - bit_depth->alpha;
+         shift_dec[channels] = bit_depth->alpha;
+         channels++;
+      }
+
+      /* With low row depths, could only be grayscale, so one channel */
+      if (row_info->bit_depth < 8)
+      {
+         png_bytep bp = row;
+         png_uint_32 i;
+         png_byte mask;
+         png_uint_32 row_bytes = row_info->rowbytes;
+
+         if (bit_depth->gray == 1 && row_info->bit_depth == 2)
+            mask = 0x55;
+         else if (row_info->bit_depth == 4 && bit_depth->gray == 3)
+            mask = 0x11;
+         else
+            mask = 0xff;
+
+         for (i = 0; i < row_bytes; i++, bp++)
+         {
+            png_uint_16 v;
+            int j;
+
+            v = *bp;
+            *bp = 0;
+            for (j = shift_start[0]; j > -shift_dec[0]; j -= shift_dec[0])
+            {
+               if (j > 0)
+                  *bp |= (png_byte)((v << j) & 0xff);
+               else
+                  *bp |= (png_byte)((v >> (-j)) & mask);
+            }
+         }
+      }
+      else if (row_info->bit_depth == 8)
+      {
+         png_bytep bp = row;
+         png_uint_32 i;
+         png_uint_32 istop = channels * row_info->width;
+
+         for (i = 0; i < istop; i++, bp++)
+         {
+
+            png_uint_16 v;
+            int j;
+            int c = (int)(i%channels);
+
+            v = *bp;
+            *bp = 0;
+            for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c])
+            {
+               if (j > 0)
+                  *bp |= (png_byte)((v << j) & 0xff);
+               else
+                  *bp |= (png_byte)((v >> (-j)) & 0xff);
+            }
+         }
+      }
+      else
+      {
+         png_bytep bp;
+         png_uint_32 i;
+         png_uint_32 istop = channels * row_info->width;
+
+         for (bp = row, i = 0; i < istop; i++)
+         {
+            int c = (int)(i%channels);
+            png_uint_16 value, v;
+            int j;
+
+            v = (png_uint_16)(((png_uint_16)(*bp) << 8) + *(bp + 1));
+            value = 0;
+            for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c])
+            {
+               if (j > 0)
+                  value |= (png_uint_16)((v << j) & (png_uint_16)0xffff);
+               else
+                  value |= (png_uint_16)((v >> (-j)) & (png_uint_16)0xffff);
+            }
+            *bp++ = (png_byte)(value >> 8);
+            *bp++ = (png_byte)(value & 0xff);
+         }
+      }
+   }
+}
+#endif
+
+#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
+void /* PRIVATE */
+png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
+{
+   png_debug(1, "in png_do_write_swap_alpha");
+
+#ifdef PNG_USELESS_TESTS_SUPPORTED
+   if (row != NULL && row_info != NULL)
+#endif
+   {
+      if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+      {
+         /* This converts from ARGB to RGBA */
+         if (row_info->bit_depth == 8)
+         {
+            png_bytep sp, dp;
+            png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
+            for (i = 0, sp = dp = row; i < row_width; i++)
+            {
+               png_byte save = *(sp++);
+               *(dp++) = *(sp++);
+               *(dp++) = *(sp++);
+               *(dp++) = *(sp++);
+               *(dp++) = save;
+            }
+         }
+         /* This converts from AARRGGBB to RRGGBBAA */
+         else
+         {
+            png_bytep sp, dp;
+            png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
+
+            for (i = 0, sp = dp = row; i < row_width; i++)
+            {
+               png_byte save[2];
+               save[0] = *(sp++);
+               save[1] = *(sp++);
+               *(dp++) = *(sp++);
+               *(dp++) = *(sp++);
+               *(dp++) = *(sp++);
+               *(dp++) = *(sp++);
+               *(dp++) = *(sp++);
+               *(dp++) = *(sp++);
+               *(dp++) = save[0];
+               *(dp++) = save[1];
+            }
+         }
+      }
+      else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
+      {
+         /* This converts from AG to GA */
+         if (row_info->bit_depth == 8)
+         {
+            png_bytep sp, dp;
+            png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
+
+            for (i = 0, sp = dp = row; i < row_width; i++)
+            {
+               png_byte save = *(sp++);
+               *(dp++) = *(sp++);
+               *(dp++) = save;
+            }
+         }
+         /* This converts from AAGG to GGAA */
+         else
+         {
+            png_bytep sp, dp;
+            png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
+
+            for (i = 0, sp = dp = row; i < row_width; i++)
+            {
+               png_byte save[2];
+               save[0] = *(sp++);
+               save[1] = *(sp++);
+               *(dp++) = *(sp++);
+               *(dp++) = *(sp++);
+               *(dp++) = save[0];
+               *(dp++) = save[1];
+            }
+         }
+      }
+   }
+}
+#endif
+
+#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
+void /* PRIVATE */
+png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
+{
+   png_debug(1, "in png_do_write_invert_alpha");
+
+#ifdef PNG_USELESS_TESTS_SUPPORTED
+   if (row != NULL && row_info != NULL)
+#endif
+   {
+      if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+      {
+         /* This inverts the alpha channel in RGBA */
+         if (row_info->bit_depth == 8)
+         {
+            png_bytep sp, dp;
+            png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
+            for (i = 0, sp = dp = row; i < row_width; i++)
+            {
+               /* Does nothing
+               *(dp++) = *(sp++);
+               *(dp++) = *(sp++);
+               *(dp++) = *(sp++);
+               */
+               sp+=3; dp = sp;
+               *(dp++) = (png_byte)(255 - *(sp++));
+            }
+         }
+         /* This inverts the alpha channel in RRGGBBAA */
+         else
+         {
+            png_bytep sp, dp;
+            png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
+
+            for (i = 0, sp = dp = row; i < row_width; i++)
+            {
+               /* Does nothing
+               *(dp++) = *(sp++);
+               *(dp++) = *(sp++);
+               *(dp++) = *(sp++);
+               *(dp++) = *(sp++);
+               *(dp++) = *(sp++);
+               *(dp++) = *(sp++);
+               */
+               sp+=6; dp = sp;
+               *(dp++) = (png_byte)(255 - *(sp++));
+               *(dp++) = (png_byte)(255 - *(sp++));
+            }
+         }
+      }
+      else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
+      {
+         /* This inverts the alpha channel in GA */
+         if (row_info->bit_depth == 8)
+         {
+            png_bytep sp, dp;
+            png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
+
+            for (i = 0, sp = dp = row; i < row_width; i++)
+            {
+               *(dp++) = *(sp++);
+               *(dp++) = (png_byte)(255 - *(sp++));
+            }
+         }
+         /* This inverts the alpha channel in GGAA */
+         else
+         {
+            png_bytep sp, dp;
+            png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
+
+            for (i = 0, sp = dp = row; i < row_width; i++)
+            {
+               /* Does nothing
+               *(dp++) = *(sp++);
+               *(dp++) = *(sp++);
+               */
+               sp+=2; dp = sp;
+               *(dp++) = (png_byte)(255 - *(sp++));
+               *(dp++) = (png_byte)(255 - *(sp++));
+            }
+         }
+      }
+   }
+}
+#endif
+
+#ifdef PNG_MNG_FEATURES_SUPPORTED
+/* Undoes intrapixel differencing  */
+void /* PRIVATE */
+png_do_write_intrapixel(png_row_infop row_info, png_bytep row)
+{
+   png_debug(1, "in png_do_write_intrapixel");
+
+   if (
+#ifdef PNG_USELESS_TESTS_SUPPORTED
+       row != NULL && row_info != NULL &&
+#endif
+       (row_info->color_type & PNG_COLOR_MASK_COLOR))
+   {
+      int bytes_per_pixel;
+      png_uint_32 row_width = row_info->width;
+      if (row_info->bit_depth == 8)
+      {
+         png_bytep rp;
+         png_uint_32 i;
+
+         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
+            bytes_per_pixel = 3;
+         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+            bytes_per_pixel = 4;
+         else
+            return;
+
+         for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
+         {
+            *(rp)   = (png_byte)((*rp     - *(rp+1))&0xff);
+            *(rp+2) = (png_byte)((*(rp+2) - *(rp+1))&0xff);
+         }
+      }
+      else if (row_info->bit_depth == 16)
+      {
+         png_bytep rp;
+         png_uint_32 i;
+
+         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
+            bytes_per_pixel = 6;
+         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+            bytes_per_pixel = 8;
+         else
+            return;
+
+         for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
+         {
+            png_uint_32 s0   = (*(rp  ) << 8) | *(rp+1);
+            png_uint_32 s1   = (*(rp+2) << 8) | *(rp+3);
+            png_uint_32 s2   = (*(rp+4) << 8) | *(rp+5);
+            png_uint_32 red  = (png_uint_32)((s0 - s1) & 0xffffL);
+            png_uint_32 blue = (png_uint_32)((s2 - s1) & 0xffffL);
+            *(rp  ) = (png_byte)((red >> 8) & 0xff);
+            *(rp+1) = (png_byte)(red & 0xff);
+            *(rp+4) = (png_byte)((blue >> 8) & 0xff);
+            *(rp+5) = (png_byte)(blue & 0xff);
+         }
+      }
+   }
+}
+#endif /* PNG_MNG_FEATURES_SUPPORTED */
+#endif /* PNG_WRITE_SUPPORTED */
diff --git a/src/libpng/pngwutil.c b/src/libpng/pngwutil.c
new file mode 100644
index 0000000..c75f53e
--- /dev/null
+++ b/src/libpng/pngwutil.c
@@ -0,0 +1,2832 @@
+
+/* pngwutil.c - utilities to write a PNG file
+ *
+ * Last changed in libpng 1.2.43 [February 25, 2010]
+ * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ */
+
+#define PNG_INTERNAL
+#define PNG_NO_PEDANTIC_WARNINGS
+#include "png.h"
+#ifdef PNG_WRITE_SUPPORTED
+
+/* Place a 32-bit number into a buffer in PNG byte order.  We work
+ * with unsigned numbers for convenience, although one supported
+ * ancillary chunk uses signed (two's complement) numbers.
+ */
+void PNGAPI
+png_save_uint_32(png_bytep buf, png_uint_32 i)
+{
+   buf[0] = (png_byte)((i >> 24) & 0xff);
+   buf[1] = (png_byte)((i >> 16) & 0xff);
+   buf[2] = (png_byte)((i >> 8) & 0xff);
+   buf[3] = (png_byte)(i & 0xff);
+}
+
+/* The png_save_int_32 function assumes integers are stored in two's
+ * complement format.  If this isn't the case, then this routine needs to
+ * be modified to write data in two's complement format.
+ */
+void PNGAPI
+png_save_int_32(png_bytep buf, png_int_32 i)
+{
+   buf[0] = (png_byte)((i >> 24) & 0xff);
+   buf[1] = (png_byte)((i >> 16) & 0xff);
+   buf[2] = (png_byte)((i >> 8) & 0xff);
+   buf[3] = (png_byte)(i & 0xff);
+}
+
+/* Place a 16-bit number into a buffer in PNG byte order.
+ * The parameter is declared unsigned int, not png_uint_16,
+ * just to avoid potential problems on pre-ANSI C compilers.
+ */
+void PNGAPI
+png_save_uint_16(png_bytep buf, unsigned int i)
+{
+   buf[0] = (png_byte)((i >> 8) & 0xff);
+   buf[1] = (png_byte)(i & 0xff);
+}
+
+/* Simple function to write the signature.  If we have already written
+ * the magic bytes of the signature, or more likely, the PNG stream is
+ * being embedded into another stream and doesn't need its own signature,
+ * we should call png_set_sig_bytes() to tell libpng how many of the
+ * bytes have already been written.
+ */
+void /* PRIVATE */
+png_write_sig(png_structp png_ptr)
+{
+   png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10};
+
+   /* Write the rest of the 8 byte signature */
+   png_write_data(png_ptr, &png_signature[png_ptr->sig_bytes],
+      (png_size_t)(8 - png_ptr->sig_bytes));
+   if (png_ptr->sig_bytes < 3)
+      png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
+}
+
+/* Write a PNG chunk all at once.  The type is an array of ASCII characters
+ * representing the chunk name.  The array must be at least 4 bytes in
+ * length, and does not need to be null terminated.  To be safe, pass the
+ * pre-defined chunk names here, and if you need a new one, define it
+ * where the others are defined.  The length is the length of the data.
+ * All the data must be present.  If that is not possible, use the
+ * png_write_chunk_start(), png_write_chunk_data(), and png_write_chunk_end()
+ * functions instead.
+ */
+void PNGAPI
+png_write_chunk(png_structp png_ptr, png_bytep chunk_name,
+   png_bytep data, png_size_t length)
+{
+   if (png_ptr == NULL)
+      return;
+   png_write_chunk_start(png_ptr, chunk_name, (png_uint_32)length);
+   png_write_chunk_data(png_ptr, data, (png_size_t)length);
+   png_write_chunk_end(png_ptr);
+}
+
+/* Write the start of a PNG chunk.  The type is the chunk type.
+ * The total_length is the sum of the lengths of all the data you will be
+ * passing in png_write_chunk_data().
+ */
+void PNGAPI
+png_write_chunk_start(png_structp png_ptr, png_bytep chunk_name,
+   png_uint_32 length)
+{
+   png_byte buf[8];
+
+   png_debug2(0, "Writing %s chunk, length = %lu", chunk_name,
+      (unsigned long)length);
+
+   if (png_ptr == NULL)
+      return;
+
+
+   /* Write the length and the chunk name */
+   png_save_uint_32(buf, length);
+   png_memcpy(buf + 4, chunk_name, 4);
+   png_write_data(png_ptr, buf, (png_size_t)8);
+   /* Put the chunk name into png_ptr->chunk_name */
+   png_memcpy(png_ptr->chunk_name, chunk_name, 4);
+   /* Reset the crc and run it over the chunk name */
+   png_reset_crc(png_ptr);
+   png_calculate_crc(png_ptr, chunk_name, (png_size_t)4);
+}
+
+/* Write the data of a PNG chunk started with png_write_chunk_start().
+ * Note that multiple calls to this function are allowed, and that the
+ * sum of the lengths from these calls *must* add up to the total_length
+ * given to png_write_chunk_start().
+ */
+void PNGAPI
+png_write_chunk_data(png_structp png_ptr, png_bytep data, png_size_t length)
+{
+   /* Write the data, and run the CRC over it */
+   if (png_ptr == NULL)
+      return;
+   if (data != NULL && length > 0)
+   {
+      png_write_data(png_ptr, data, length);
+      /* Update the CRC after writing the data,
+       * in case that the user I/O routine alters it.
+       */
+      png_calculate_crc(png_ptr, data, length);
+   }
+}
+
+/* Finish a chunk started with png_write_chunk_start(). */
+void PNGAPI
+png_write_chunk_end(png_structp png_ptr)
+{
+   png_byte buf[4];
+
+   if (png_ptr == NULL) return;
+
+   /* Write the crc in a single operation */
+   png_save_uint_32(buf, png_ptr->crc);
+
+   png_write_data(png_ptr, buf, (png_size_t)4);
+}
+
+#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_iCCP_SUPPORTED)
+/* This pair of functions encapsulates the operation of (a) compressing a
+ * text string, and (b) issuing it later as a series of chunk data writes.
+ * The compression_state structure is shared context for these functions
+ * set up by the caller in order to make the whole mess thread-safe.
+ */
+
+typedef struct
+{
+   char *input;   /* The uncompressed input data */
+   int input_len;   /* Its length */
+   int num_output_ptr; /* Number of output pointers used */
+   int max_output_ptr; /* Size of output_ptr */
+   png_charpp output_ptr; /* Array of pointers to output */
+} compression_state;
+
+/* Compress given text into storage in the png_ptr structure */
+static int /* PRIVATE */
+png_text_compress(png_structp png_ptr,
+        png_charp text, png_size_t text_len, int compression,
+        compression_state *comp)
+{
+   int ret;
+
+   comp->num_output_ptr = 0;
+   comp->max_output_ptr = 0;
+   comp->output_ptr = NULL;
+   comp->input = NULL;
+   comp->input_len = 0;
+
+   /* We may just want to pass the text right through */
+   if (compression == PNG_TEXT_COMPRESSION_NONE)
+   {
+       comp->input = text;
+       comp->input_len = text_len;
+       return((int)text_len);
+   }
+
+   if (compression >= PNG_TEXT_COMPRESSION_LAST)
+   {
+#if defined(PNG_STDIO_SUPPORTED) && !defined(_WIN32_WCE)
+      char msg[50];
+      png_snprintf(msg, 50, "Unknown compression type %d", compression);
+      png_warning(png_ptr, msg);
+#else
+      png_warning(png_ptr, "Unknown compression type");
+#endif
+   }
+
+   /* We can't write the chunk until we find out how much data we have,
+    * which means we need to run the compressor first and save the
+    * output.  This shouldn't be a problem, as the vast majority of
+    * comments should be reasonable, but we will set up an array of
+    * malloc'd pointers to be sure.
+    *
+    * If we knew the application was well behaved, we could simplify this
+    * greatly by assuming we can always malloc an output buffer large
+    * enough to hold the compressed text ((1001 * text_len / 1000) + 12)
+    * and malloc this directly.  The only time this would be a bad idea is
+    * if we can't malloc more than 64K and we have 64K of random input
+    * data, or if the input string is incredibly large (although this
+    * wouldn't cause a failure, just a slowdown due to swapping).
+    */
+
+   /* Set up the compression buffers */
+   png_ptr->zstream.avail_in = (uInt)text_len;
+   png_ptr->zstream.next_in = (Bytef *)text;
+   png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+   png_ptr->zstream.next_out = (Bytef *)png_ptr->zbuf;
+
+   /* This is the same compression loop as in png_write_row() */
+   do
+   {
+      /* Compress the data */
+      ret = deflate(&png_ptr->zstream, Z_NO_FLUSH);
+      if (ret != Z_OK)
+      {
+         /* Error */
+         if (png_ptr->zstream.msg != NULL)
+            png_error(png_ptr, png_ptr->zstream.msg);
+         else
+            png_error(png_ptr, "zlib error");
+      }
+      /* Check to see if we need more room */
+      if (!(png_ptr->zstream.avail_out))
+      {
+         /* Make sure the output array has room */
+         if (comp->num_output_ptr >= comp->max_output_ptr)
+         {
+            int old_max;
+
+            old_max = comp->max_output_ptr;
+            comp->max_output_ptr = comp->num_output_ptr + 4;
+            if (comp->output_ptr != NULL)
+            {
+               png_charpp old_ptr;
+
+               old_ptr = comp->output_ptr;
+               comp->output_ptr = (png_charpp)png_malloc(png_ptr,
+                  (png_uint_32)
+                  (comp->max_output_ptr * png_sizeof(png_charpp)));
+               png_memcpy(comp->output_ptr, old_ptr, old_max
+                  * png_sizeof(png_charp));
+               png_free(png_ptr, old_ptr);
+            }
+            else
+               comp->output_ptr = (png_charpp)png_malloc(png_ptr,
+                  (png_uint_32)
+                  (comp->max_output_ptr * png_sizeof(png_charp)));
+         }
+
+         /* Save the data */
+         comp->output_ptr[comp->num_output_ptr] =
+            (png_charp)png_malloc(png_ptr,
+            (png_uint_32)png_ptr->zbuf_size);
+         png_memcpy(comp->output_ptr[comp->num_output_ptr], png_ptr->zbuf,
+            png_ptr->zbuf_size);
+         comp->num_output_ptr++;
+
+         /* and reset the buffer */
+         png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+         png_ptr->zstream.next_out = png_ptr->zbuf;
+      }
+   /* Continue until we don't have any more to compress */
+   } while (png_ptr->zstream.avail_in);
+
+   /* Finish the compression */
+   do
+   {
+      /* Tell zlib we are finished */
+      ret = deflate(&png_ptr->zstream, Z_FINISH);
+
+      if (ret == Z_OK)
+      {
+         /* Check to see if we need more room */
+         if (!(png_ptr->zstream.avail_out))
+         {
+            /* Check to make sure our output array has room */
+            if (comp->num_output_ptr >= comp->max_output_ptr)
+            {
+               int old_max;
+
+               old_max = comp->max_output_ptr;
+               comp->max_output_ptr = comp->num_output_ptr + 4;
+               if (comp->output_ptr != NULL)
+               {
+                  png_charpp old_ptr;
+
+                  old_ptr = comp->output_ptr;
+                  /* This could be optimized to realloc() */
+                  comp->output_ptr = (png_charpp)png_malloc(png_ptr,
+                     (png_uint_32)(comp->max_output_ptr *
+                     png_sizeof(png_charp)));
+                  png_memcpy(comp->output_ptr, old_ptr,
+                     old_max * png_sizeof(png_charp));
+                  png_free(png_ptr, old_ptr);
+               }
+               else
+                  comp->output_ptr = (png_charpp)png_malloc(png_ptr,
+                     (png_uint_32)(comp->max_output_ptr *
+                     png_sizeof(png_charp)));
+            }
+
+            /* Save the data */
+            comp->output_ptr[comp->num_output_ptr] =
+               (png_charp)png_malloc(png_ptr,
+               (png_uint_32)png_ptr->zbuf_size);
+            png_memcpy(comp->output_ptr[comp->num_output_ptr], png_ptr->zbuf,
+               png_ptr->zbuf_size);
+            comp->num_output_ptr++;
+
+            /* and reset the buffer pointers */
+            png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+            png_ptr->zstream.next_out = png_ptr->zbuf;
+         }
+      }
+      else if (ret != Z_STREAM_END)
+      {
+         /* We got an error */
+         if (png_ptr->zstream.msg != NULL)
+            png_error(png_ptr, png_ptr->zstream.msg);
+         else
+            png_error(png_ptr, "zlib error");
+      }
+   } while (ret != Z_STREAM_END);
+
+   /* Text length is number of buffers plus last buffer */
+   text_len = png_ptr->zbuf_size * comp->num_output_ptr;
+   if (png_ptr->zstream.avail_out < png_ptr->zbuf_size)
+      text_len += png_ptr->zbuf_size - (png_size_t)png_ptr->zstream.avail_out;
+
+   return((int)text_len);
+}
+
+/* Ship the compressed text out via chunk writes */
+static void /* PRIVATE */
+png_write_compressed_data_out(png_structp png_ptr, compression_state *comp)
+{
+   int i;
+
+   /* Handle the no-compression case */
+   if (comp->input)
+   {
+      png_write_chunk_data(png_ptr, (png_bytep)comp->input,
+                            (png_size_t)comp->input_len);
+      return;
+   }
+
+   /* Write saved output buffers, if any */
+   for (i = 0; i < comp->num_output_ptr; i++)
+   {
+      png_write_chunk_data(png_ptr, (png_bytep)comp->output_ptr[i],
+         (png_size_t)png_ptr->zbuf_size);
+      png_free(png_ptr, comp->output_ptr[i]);
+       comp->output_ptr[i]=NULL;
+   }
+   if (comp->max_output_ptr != 0)
+      png_free(png_ptr, comp->output_ptr);
+       comp->output_ptr=NULL;
+   /* Write anything left in zbuf */
+   if (png_ptr->zstream.avail_out < (png_uint_32)png_ptr->zbuf_size)
+      png_write_chunk_data(png_ptr, png_ptr->zbuf,
+         (png_size_t)(png_ptr->zbuf_size - png_ptr->zstream.avail_out));
+
+   /* Reset zlib for another zTXt/iTXt or image data */
+   deflateReset(&png_ptr->zstream);
+   png_ptr->zstream.data_type = Z_BINARY;
+}
+#endif
+
+/* Write the IHDR chunk, and update the png_struct with the necessary
+ * information.  Note that the rest of this code depends upon this
+ * information being correct.
+ */
+void /* PRIVATE */
+png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
+   int bit_depth, int color_type, int compression_type, int filter_type,
+   int interlace_type)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+   PNG_IHDR;
+#endif
+   int ret;
+
+   png_byte buf[13]; /* Buffer to store the IHDR info */
+
+   png_debug(1, "in png_write_IHDR");
+
+   /* Check that we have valid input data from the application info */
+   switch (color_type)
+   {
+      case PNG_COLOR_TYPE_GRAY:
+         switch (bit_depth)
+         {
+            case 1:
+            case 2:
+            case 4:
+            case 8:
+            case 16: png_ptr->channels = 1; break;
+            default: png_error(png_ptr,
+                         "Invalid bit depth for grayscale image");
+         }
+         break;
+      case PNG_COLOR_TYPE_RGB:
+         if (bit_depth != 8 && bit_depth != 16)
+            png_error(png_ptr, "Invalid bit depth for RGB image");
+         png_ptr->channels = 3;
+         break;
+      case PNG_COLOR_TYPE_PALETTE:
+         switch (bit_depth)
+         {
+            case 1:
+            case 2:
+            case 4:
+            case 8: png_ptr->channels = 1; break;
+            default: png_error(png_ptr, "Invalid bit depth for paletted image");
+         }
+         break;
+      case PNG_COLOR_TYPE_GRAY_ALPHA:
+         if (bit_depth != 8 && bit_depth != 16)
+            png_error(png_ptr, "Invalid bit depth for grayscale+alpha image");
+         png_ptr->channels = 2;
+         break;
+      case PNG_COLOR_TYPE_RGB_ALPHA:
+         if (bit_depth != 8 && bit_depth != 16)
+            png_error(png_ptr, "Invalid bit depth for RGBA image");
+         png_ptr->channels = 4;
+         break;
+      default:
+         png_error(png_ptr, "Invalid image color type specified");
+   }
+
+   if (compression_type != PNG_COMPRESSION_TYPE_BASE)
+   {
+      png_warning(png_ptr, "Invalid compression type specified");
+      compression_type = PNG_COMPRESSION_TYPE_BASE;
+   }
+
+   /* Write filter_method 64 (intrapixel differencing) only if
+    * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
+    * 2. Libpng did not write a PNG signature (this filter_method is only
+    *    used in PNG datastreams that are embedded in MNG datastreams) and
+    * 3. The application called png_permit_mng_features with a mask that
+    *    included PNG_FLAG_MNG_FILTER_64 and
+    * 4. The filter_method is 64 and
+    * 5. The color_type is RGB or RGBA
+    */
+   if (
+#ifdef PNG_MNG_FEATURES_SUPPORTED
+      !((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+      ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) == 0) &&
+      (color_type == PNG_COLOR_TYPE_RGB ||
+       color_type == PNG_COLOR_TYPE_RGB_ALPHA) &&
+      (filter_type == PNG_INTRAPIXEL_DIFFERENCING)) &&
+#endif
+      filter_type != PNG_FILTER_TYPE_BASE)
+   {
+      png_warning(png_ptr, "Invalid filter type specified");
+      filter_type = PNG_FILTER_TYPE_BASE;
+   }
+
+#ifdef PNG_WRITE_INTERLACING_SUPPORTED
+   if (interlace_type != PNG_INTERLACE_NONE &&
+      interlace_type != PNG_INTERLACE_ADAM7)
+   {
+      png_warning(png_ptr, "Invalid interlace type specified");
+      interlace_type = PNG_INTERLACE_ADAM7;
+   }
+#else
+   interlace_type=PNG_INTERLACE_NONE;
+#endif
+
+   /* Save the relevent information */
+   png_ptr->bit_depth = (png_byte)bit_depth;
+   png_ptr->color_type = (png_byte)color_type;
+   png_ptr->interlaced = (png_byte)interlace_type;
+#ifdef PNG_MNG_FEATURES_SUPPORTED
+   png_ptr->filter_type = (png_byte)filter_type;
+#endif
+   png_ptr->compression_type = (png_byte)compression_type;
+   png_ptr->width = width;
+   png_ptr->height = height;
+
+   png_ptr->pixel_depth = (png_byte)(bit_depth * png_ptr->channels);
+   png_ptr->rowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, width);
+   /* Set the usr info, so any transformations can modify it */
+   png_ptr->usr_width = png_ptr->width;
+   png_ptr->usr_bit_depth = png_ptr->bit_depth;
+   png_ptr->usr_channels = png_ptr->channels;
+
+   /* Pack the header information into the buffer */
+   png_save_uint_32(buf, width);
+   png_save_uint_32(buf + 4, height);
+   buf[8] = (png_byte)bit_depth;
+   buf[9] = (png_byte)color_type;
+   buf[10] = (png_byte)compression_type;
+   buf[11] = (png_byte)filter_type;
+   buf[12] = (png_byte)interlace_type;
+
+   /* Write the chunk */
+   png_write_chunk(png_ptr, (png_bytep)png_IHDR, buf, (png_size_t)13);
+
+   /* Initialize zlib with PNG info */
+   png_ptr->zstream.zalloc = png_zalloc;
+   png_ptr->zstream.zfree = png_zfree;
+   png_ptr->zstream.opaque = (voidpf)png_ptr;
+   if (!(png_ptr->do_filter))
+   {
+      if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE ||
+         png_ptr->bit_depth < 8)
+         png_ptr->do_filter = PNG_FILTER_NONE;
+      else
+         png_ptr->do_filter = PNG_ALL_FILTERS;
+   }
+   if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_STRATEGY))
+   {
+      if (png_ptr->do_filter != PNG_FILTER_NONE)
+         png_ptr->zlib_strategy = Z_FILTERED;
+      else
+         png_ptr->zlib_strategy = Z_DEFAULT_STRATEGY;
+   }
+   if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_LEVEL))
+      png_ptr->zlib_level = Z_DEFAULT_COMPRESSION;
+   if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL))
+      png_ptr->zlib_mem_level = 8;
+   if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS))
+      png_ptr->zlib_window_bits = 15;
+   if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_METHOD))
+      png_ptr->zlib_method = 8;
+   ret = deflateInit2(&png_ptr->zstream, png_ptr->zlib_level,
+         png_ptr->zlib_method, png_ptr->zlib_window_bits,
+         png_ptr->zlib_mem_level, png_ptr->zlib_strategy);
+   if (ret != Z_OK)
+   {
+      if (ret == Z_VERSION_ERROR) png_error(png_ptr,
+          "zlib failed to initialize compressor -- version error");
+      if (ret == Z_STREAM_ERROR) png_error(png_ptr,
+           "zlib failed to initialize compressor -- stream error");
+      if (ret == Z_MEM_ERROR) png_error(png_ptr,
+           "zlib failed to initialize compressor -- mem error");
+      png_error(png_ptr, "zlib failed to initialize compressor");
+   }
+   png_ptr->zstream.next_out = png_ptr->zbuf;
+   png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+   /* libpng is not interested in zstream.data_type */
+   /* Set it to a predefined value, to avoid its evaluation inside zlib */
+   png_ptr->zstream.data_type = Z_BINARY;
+
+   png_ptr->mode = PNG_HAVE_IHDR;
+}
+
+/* Write the palette.  We are careful not to trust png_color to be in the
+ * correct order for PNG, so people can redefine it to any convenient
+ * structure.
+ */
+void /* PRIVATE */
+png_write_PLTE(png_structp png_ptr, png_colorp palette, png_uint_32 num_pal)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+   PNG_PLTE;
+#endif
+   png_uint_32 i;
+   png_colorp pal_ptr;
+   png_byte buf[3];
+
+   png_debug(1, "in png_write_PLTE");
+
+   if ((
+#ifdef PNG_MNG_FEATURES_SUPPORTED
+        !(png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) &&
+#endif
+        num_pal == 0) || num_pal > 256)
+   {
+     if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
+     {
+        png_error(png_ptr, "Invalid number of colors in palette");
+     }
+     else
+     {
+        png_warning(png_ptr, "Invalid number of colors in palette");
+        return;
+     }
+   }
+
+   if (!(png_ptr->color_type&PNG_COLOR_MASK_COLOR))
+   {
+      png_warning(png_ptr,
+        "Ignoring request to write a PLTE chunk in grayscale PNG");
+      return;
+   }
+
+   png_ptr->num_palette = (png_uint_16)num_pal;
+   png_debug1(3, "num_palette = %d", png_ptr->num_palette);
+
+   png_write_chunk_start(png_ptr, (png_bytep)png_PLTE,
+     (png_uint_32)(num_pal * 3));
+#ifdef PNG_POINTER_INDEXING_SUPPORTED
+   for (i = 0, pal_ptr = palette; i < num_pal; i++, pal_ptr++)
+   {
+      buf[0] = pal_ptr->red;
+      buf[1] = pal_ptr->green;
+      buf[2] = pal_ptr->blue;
+      png_write_chunk_data(png_ptr, buf, (png_size_t)3);
+   }
+#else
+   /* This is a little slower but some buggy compilers need to do this
+    * instead
+    */
+   pal_ptr=palette;
+   for (i = 0; i < num_pal; i++)
+   {
+      buf[0] = pal_ptr[i].red;
+      buf[1] = pal_ptr[i].green;
+      buf[2] = pal_ptr[i].blue;
+      png_write_chunk_data(png_ptr, buf, (png_size_t)3);
+   }
+#endif
+   png_write_chunk_end(png_ptr);
+   png_ptr->mode |= PNG_HAVE_PLTE;
+}
+
+/* Write an IDAT chunk */
+void /* PRIVATE */
+png_write_IDAT(png_structp png_ptr, png_bytep data, png_size_t length)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+   PNG_IDAT;
+#endif
+
+   png_debug(1, "in png_write_IDAT");
+
+   /* Optimize the CMF field in the zlib stream. */
+   /* This hack of the zlib stream is compliant to the stream specification. */
+   if (!(png_ptr->mode & PNG_HAVE_IDAT) &&
+       png_ptr->compression_type == PNG_COMPRESSION_TYPE_BASE)
+   {
+      unsigned int z_cmf = data[0];  /* zlib compression method and flags */
+      if ((z_cmf & 0x0f) == 8 && (z_cmf & 0xf0) <= 0x70)
+      {
+         /* Avoid memory underflows and multiplication overflows.
+          *
+          * The conditions below are practically always satisfied;
+          * however, they still must be checked.
+          */
+         if (length >= 2 &&
+             png_ptr->height < 16384 && png_ptr->width < 16384)
+         {
+            png_uint_32 uncompressed_idat_size = png_ptr->height *
+               ((png_ptr->width *
+               png_ptr->channels * png_ptr->bit_depth + 15) >> 3);
+            unsigned int z_cinfo = z_cmf >> 4;
+            unsigned int half_z_window_size = 1 << (z_cinfo + 7);
+            while (uncompressed_idat_size <= half_z_window_size &&
+                   half_z_window_size >= 256)
+            {
+               z_cinfo--;
+               half_z_window_size >>= 1;
+            }
+            z_cmf = (z_cmf & 0x0f) | (z_cinfo << 4);
+            if (data[0] != (png_byte)z_cmf)
+            {
+               data[0] = (png_byte)z_cmf;
+               data[1] &= 0xe0;
+               data[1] += (png_byte)(0x1f - ((z_cmf << 8) + data[1]) % 0x1f);
+            }
+         }
+      }
+      else
+         png_error(png_ptr,
+            "Invalid zlib compression method or flags in IDAT");
+   }
+
+   png_write_chunk(png_ptr, (png_bytep)png_IDAT, data, length);
+   png_ptr->mode |= PNG_HAVE_IDAT;
+}
+
+/* Write an IEND chunk */
+void /* PRIVATE */
+png_write_IEND(png_structp png_ptr)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+   PNG_IEND;
+#endif
+
+   png_debug(1, "in png_write_IEND");
+
+   png_write_chunk(png_ptr, (png_bytep)png_IEND, png_bytep_NULL,
+     (png_size_t)0);
+   png_ptr->mode |= PNG_HAVE_IEND;
+}
+
+#ifdef PNG_WRITE_gAMA_SUPPORTED
+/* Write a gAMA chunk */
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+void /* PRIVATE */
+png_write_gAMA(png_structp png_ptr, double file_gamma)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+   PNG_gAMA;
+#endif
+   png_uint_32 igamma;
+   png_byte buf[4];
+
+   png_debug(1, "in png_write_gAMA");
+
+   /* file_gamma is saved in 1/100,000ths */
+   igamma = (png_uint_32)(file_gamma * 100000.0 + 0.5);
+   png_save_uint_32(buf, igamma);
+   png_write_chunk(png_ptr, (png_bytep)png_gAMA, buf, (png_size_t)4);
+}
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+void /* PRIVATE */
+png_write_gAMA_fixed(png_structp png_ptr, png_fixed_point file_gamma)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+   PNG_gAMA;
+#endif
+   png_byte buf[4];
+
+   png_debug(1, "in png_write_gAMA");
+
+   /* file_gamma is saved in 1/100,000ths */
+   png_save_uint_32(buf, (png_uint_32)file_gamma);
+   png_write_chunk(png_ptr, (png_bytep)png_gAMA, buf, (png_size_t)4);
+}
+#endif
+#endif
+
+#ifdef PNG_WRITE_sRGB_SUPPORTED
+/* Write a sRGB chunk */
+void /* PRIVATE */
+png_write_sRGB(png_structp png_ptr, int srgb_intent)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+   PNG_sRGB;
+#endif
+   png_byte buf[1];
+
+   png_debug(1, "in png_write_sRGB");
+
+   if (srgb_intent >= PNG_sRGB_INTENT_LAST)
+         png_warning(png_ptr,
+            "Invalid sRGB rendering intent specified");
+   buf[0]=(png_byte)srgb_intent;
+   png_write_chunk(png_ptr, (png_bytep)png_sRGB, buf, (png_size_t)1);
+}
+#endif
+
+#ifdef PNG_WRITE_iCCP_SUPPORTED
+/* Write an iCCP chunk */
+void /* PRIVATE */
+png_write_iCCP(png_structp png_ptr, png_charp name, int compression_type,
+   png_charp profile, int profile_len)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+   PNG_iCCP;
+#endif
+   png_size_t name_len;
+   png_charp new_name;
+   compression_state comp;
+   int embedded_profile_len = 0;
+
+   png_debug(1, "in png_write_iCCP");
+
+   comp.num_output_ptr = 0;
+   comp.max_output_ptr = 0;
+   comp.output_ptr = NULL;
+   comp.input = NULL;
+   comp.input_len = 0;
+
+   if ((name_len = png_check_keyword(png_ptr, name,
+      &new_name)) == 0)
+      return;
+
+   if (compression_type != PNG_COMPRESSION_TYPE_BASE)
+      png_warning(png_ptr, "Unknown compression type in iCCP chunk");
+
+   if (profile == NULL)
+      profile_len = 0;
+
+   if (profile_len > 3)
+      embedded_profile_len =
+          ((*( (png_bytep)profile    ))<<24) |
+          ((*( (png_bytep)profile + 1))<<16) |
+          ((*( (png_bytep)profile + 2))<< 8) |
+          ((*( (png_bytep)profile + 3))    );
+
+   if (embedded_profile_len < 0)
+   {
+      png_warning(png_ptr,
+        "Embedded profile length in iCCP chunk is negative");
+      png_free(png_ptr, new_name);
+      return;
+   }
+
+   if (profile_len < embedded_profile_len)
+   {
+      png_warning(png_ptr,
+        "Embedded profile length too large in iCCP chunk");
+      png_free(png_ptr, new_name);
+      return;
+   }
+
+   if (profile_len > embedded_profile_len)
+   {
+      png_warning(png_ptr,
+        "Truncating profile to actual length in iCCP chunk");
+      profile_len = embedded_profile_len;
+   }
+
+   if (profile_len)
+      profile_len = png_text_compress(png_ptr, profile,
+        (png_size_t)profile_len, PNG_COMPRESSION_TYPE_BASE, &comp);
+
+   /* Make sure we include the NULL after the name and the compression type */
+   png_write_chunk_start(png_ptr, (png_bytep)png_iCCP,
+          (png_uint_32)(name_len + profile_len + 2));
+   new_name[name_len + 1] = 0x00;
+   png_write_chunk_data(png_ptr, (png_bytep)new_name,
+     (png_size_t)(name_len + 2));
+
+   if (profile_len)
+      png_write_compressed_data_out(png_ptr, &comp);
+
+   png_write_chunk_end(png_ptr);
+   png_free(png_ptr, new_name);
+}
+#endif
+
+#ifdef PNG_WRITE_sPLT_SUPPORTED
+/* Write a sPLT chunk */
+void /* PRIVATE */
+png_write_sPLT(png_structp png_ptr, png_sPLT_tp spalette)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+   PNG_sPLT;
+#endif
+   png_size_t name_len;
+   png_charp new_name;
+   png_byte entrybuf[10];
+   int entry_size = (spalette->depth == 8 ? 6 : 10);
+   int palette_size = entry_size * spalette->nentries;
+   png_sPLT_entryp ep;
+#ifndef PNG_POINTER_INDEXING_SUPPORTED
+   int i;
+#endif
+
+   png_debug(1, "in png_write_sPLT");
+
+   if ((name_len = png_check_keyword(png_ptr,spalette->name, &new_name))==0)
+      return;
+
+   /* Make sure we include the NULL after the name */
+   png_write_chunk_start(png_ptr, (png_bytep)png_sPLT,
+     (png_uint_32)(name_len + 2 + palette_size));
+   png_write_chunk_data(png_ptr, (png_bytep)new_name,
+     (png_size_t)(name_len + 1));
+   png_write_chunk_data(png_ptr, (png_bytep)&spalette->depth, (png_size_t)1);
+
+   /* Loop through each palette entry, writing appropriately */
+#ifdef PNG_POINTER_INDEXING_SUPPORTED
+   for (ep = spalette->entries; ep<spalette->entries + spalette->nentries; ep++)
+   {
+      if (spalette->depth == 8)
+      {
+          entrybuf[0] = (png_byte)ep->red;
+          entrybuf[1] = (png_byte)ep->green;
+          entrybuf[2] = (png_byte)ep->blue;
+          entrybuf[3] = (png_byte)ep->alpha;
+          png_save_uint_16(entrybuf + 4, ep->frequency);
+      }
+      else
+      {
+          png_save_uint_16(entrybuf + 0, ep->red);
+          png_save_uint_16(entrybuf + 2, ep->green);
+          png_save_uint_16(entrybuf + 4, ep->blue);
+          png_save_uint_16(entrybuf + 6, ep->alpha);
+          png_save_uint_16(entrybuf + 8, ep->frequency);
+      }
+      png_write_chunk_data(png_ptr, entrybuf, (png_size_t)entry_size);
+   }
+#else
+   ep=spalette->entries;
+   for (i=0; i>spalette->nentries; i++)
+   {
+      if (spalette->depth == 8)
+      {
+          entrybuf[0] = (png_byte)ep[i].red;
+          entrybuf[1] = (png_byte)ep[i].green;
+          entrybuf[2] = (png_byte)ep[i].blue;
+          entrybuf[3] = (png_byte)ep[i].alpha;
+          png_save_uint_16(entrybuf + 4, ep[i].frequency);
+      }
+      else
+      {
+          png_save_uint_16(entrybuf + 0, ep[i].red);
+          png_save_uint_16(entrybuf + 2, ep[i].green);
+          png_save_uint_16(entrybuf + 4, ep[i].blue);
+          png_save_uint_16(entrybuf + 6, ep[i].alpha);
+          png_save_uint_16(entrybuf + 8, ep[i].frequency);
+      }
+      png_write_chunk_data(png_ptr, entrybuf, (png_size_t)entry_size);
+   }
+#endif
+
+   png_write_chunk_end(png_ptr);
+   png_free(png_ptr, new_name);
+}
+#endif
+
+#ifdef PNG_WRITE_sBIT_SUPPORTED
+/* Write the sBIT chunk */
+void /* PRIVATE */
+png_write_sBIT(png_structp png_ptr, png_color_8p sbit, int color_type)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+   PNG_sBIT;
+#endif
+   png_byte buf[4];
+   png_size_t size;
+
+   png_debug(1, "in png_write_sBIT");
+
+   /* Make sure we don't depend upon the order of PNG_COLOR_8 */
+   if (color_type & PNG_COLOR_MASK_COLOR)
+   {
+      png_byte maxbits;
+
+      maxbits = (png_byte)(color_type==PNG_COLOR_TYPE_PALETTE ? 8 :
+                png_ptr->usr_bit_depth);
+      if (sbit->red == 0 || sbit->red > maxbits ||
+          sbit->green == 0 || sbit->green > maxbits ||
+          sbit->blue == 0 || sbit->blue > maxbits)
+      {
+         png_warning(png_ptr, "Invalid sBIT depth specified");
+         return;
+      }
+      buf[0] = sbit->red;
+      buf[1] = sbit->green;
+      buf[2] = sbit->blue;
+      size = 3;
+   }
+   else
+   {
+      if (sbit->gray == 0 || sbit->gray > png_ptr->usr_bit_depth)
+      {
+         png_warning(png_ptr, "Invalid sBIT depth specified");
+         return;
+      }
+      buf[0] = sbit->gray;
+      size = 1;
+   }
+
+   if (color_type & PNG_COLOR_MASK_ALPHA)
+   {
+      if (sbit->alpha == 0 || sbit->alpha > png_ptr->usr_bit_depth)
+      {
+         png_warning(png_ptr, "Invalid sBIT depth specified");
+         return;
+      }
+      buf[size++] = sbit->alpha;
+   }
+
+   png_write_chunk(png_ptr, (png_bytep)png_sBIT, buf, size);
+}
+#endif
+
+#ifdef PNG_WRITE_cHRM_SUPPORTED
+/* Write the cHRM chunk */
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+void /* PRIVATE */
+png_write_cHRM(png_structp png_ptr, double white_x, double white_y,
+   double red_x, double red_y, double green_x, double green_y,
+   double blue_x, double blue_y)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+   PNG_cHRM;
+#endif
+   png_byte buf[32];
+
+   png_fixed_point int_white_x, int_white_y, int_red_x, int_red_y,
+      int_green_x, int_green_y, int_blue_x, int_blue_y;
+
+   png_debug(1, "in png_write_cHRM");
+
+   int_white_x = (png_uint_32)(white_x * 100000.0 + 0.5);
+   int_white_y = (png_uint_32)(white_y * 100000.0 + 0.5);
+   int_red_x   = (png_uint_32)(red_x   * 100000.0 + 0.5);
+   int_red_y   = (png_uint_32)(red_y   * 100000.0 + 0.5);
+   int_green_x = (png_uint_32)(green_x * 100000.0 + 0.5);
+   int_green_y = (png_uint_32)(green_y * 100000.0 + 0.5);
+   int_blue_x  = (png_uint_32)(blue_x  * 100000.0 + 0.5);
+   int_blue_y  = (png_uint_32)(blue_y  * 100000.0 + 0.5);
+
+#ifdef PNG_CHECK_cHRM_SUPPORTED
+   if (png_check_cHRM_fixed(png_ptr, int_white_x, int_white_y,
+      int_red_x, int_red_y, int_green_x, int_green_y, int_blue_x, int_blue_y))
+#endif
+   {
+      /* Each value is saved in 1/100,000ths */
+
+      png_save_uint_32(buf, int_white_x);
+      png_save_uint_32(buf + 4, int_white_y);
+
+      png_save_uint_32(buf + 8, int_red_x);
+      png_save_uint_32(buf + 12, int_red_y);
+
+      png_save_uint_32(buf + 16, int_green_x);
+      png_save_uint_32(buf + 20, int_green_y);
+
+      png_save_uint_32(buf + 24, int_blue_x);
+      png_save_uint_32(buf + 28, int_blue_y);
+
+      png_write_chunk(png_ptr, (png_bytep)png_cHRM, buf, (png_size_t)32);
+   }
+}
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+void /* PRIVATE */
+png_write_cHRM_fixed(png_structp png_ptr, png_fixed_point white_x,
+   png_fixed_point white_y, png_fixed_point red_x, png_fixed_point red_y,
+   png_fixed_point green_x, png_fixed_point green_y, png_fixed_point blue_x,
+   png_fixed_point blue_y)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+   PNG_cHRM;
+#endif
+   png_byte buf[32];
+
+   png_debug(1, "in png_write_cHRM");
+
+   /* Each value is saved in 1/100,000ths */
+#ifdef PNG_CHECK_cHRM_SUPPORTED
+   if (png_check_cHRM_fixed(png_ptr, white_x, white_y, red_x, red_y,
+      green_x, green_y, blue_x, blue_y))
+#endif
+   {
+      png_save_uint_32(buf, (png_uint_32)white_x);
+      png_save_uint_32(buf + 4, (png_uint_32)white_y);
+
+      png_save_uint_32(buf + 8, (png_uint_32)red_x);
+      png_save_uint_32(buf + 12, (png_uint_32)red_y);
+
+      png_save_uint_32(buf + 16, (png_uint_32)green_x);
+      png_save_uint_32(buf + 20, (png_uint_32)green_y);
+
+      png_save_uint_32(buf + 24, (png_uint_32)blue_x);
+      png_save_uint_32(buf + 28, (png_uint_32)blue_y);
+
+      png_write_chunk(png_ptr, (png_bytep)png_cHRM, buf, (png_size_t)32);
+   }
+}
+#endif
+#endif
+
+#ifdef PNG_WRITE_tRNS_SUPPORTED
+/* Write the tRNS chunk */
+void /* PRIVATE */
+png_write_tRNS(png_structp png_ptr, png_bytep trans, png_color_16p tran,
+   int num_trans, int color_type)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+   PNG_tRNS;
+#endif
+   png_byte buf[6];
+
+   png_debug(1, "in png_write_tRNS");
+
+   if (color_type == PNG_COLOR_TYPE_PALETTE)
+   {
+      if (num_trans <= 0 || num_trans > (int)png_ptr->num_palette)
+      {
+         png_warning(png_ptr, "Invalid number of transparent colors specified");
+         return;
+      }
+      /* Write the chunk out as it is */
+      png_write_chunk(png_ptr, (png_bytep)png_tRNS, trans,
+        (png_size_t)num_trans);
+   }
+   else if (color_type == PNG_COLOR_TYPE_GRAY)
+   {
+      /* One 16 bit value */
+      if (tran->gray >= (1 << png_ptr->bit_depth))
+      {
+         png_warning(png_ptr,
+           "Ignoring attempt to write tRNS chunk out-of-range for bit_depth");
+         return;
+      }
+      png_save_uint_16(buf, tran->gray);
+      png_write_chunk(png_ptr, (png_bytep)png_tRNS, buf, (png_size_t)2);
+   }
+   else if (color_type == PNG_COLOR_TYPE_RGB)
+   {
+      /* Three 16 bit values */
+      png_save_uint_16(buf, tran->red);
+      png_save_uint_16(buf + 2, tran->green);
+      png_save_uint_16(buf + 4, tran->blue);
+      if (png_ptr->bit_depth == 8 && (buf[0] | buf[2] | buf[4]))
+      {
+         png_warning(png_ptr,
+           "Ignoring attempt to write 16-bit tRNS chunk when bit_depth is 8");
+         return;
+      }
+      png_write_chunk(png_ptr, (png_bytep)png_tRNS, buf, (png_size_t)6);
+   }
+   else
+   {
+      png_warning(png_ptr, "Can't write tRNS with an alpha channel");
+   }
+}
+#endif
+
+#ifdef PNG_WRITE_bKGD_SUPPORTED
+/* Write the background chunk */
+void /* PRIVATE */
+png_write_bKGD(png_structp png_ptr, png_color_16p back, int color_type)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+   PNG_bKGD;
+#endif
+   png_byte buf[6];
+
+   png_debug(1, "in png_write_bKGD");
+
+   if (color_type == PNG_COLOR_TYPE_PALETTE)
+   {
+      if (
+#ifdef PNG_MNG_FEATURES_SUPPORTED
+          (png_ptr->num_palette ||
+          (!(png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE))) &&
+#endif
+         back->index >= png_ptr->num_palette)
+      {
+         png_warning(png_ptr, "Invalid background palette index");
+         return;
+      }
+      buf[0] = back->index;
+      png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, (png_size_t)1);
+   }
+   else if (color_type & PNG_COLOR_MASK_COLOR)
+   {
+      png_save_uint_16(buf, back->red);
+      png_save_uint_16(buf + 2, back->green);
+      png_save_uint_16(buf + 4, back->blue);
+      if (png_ptr->bit_depth == 8 && (buf[0] | buf[2] | buf[4]))
+      {
+         png_warning(png_ptr,
+           "Ignoring attempt to write 16-bit bKGD chunk when bit_depth is 8");
+         return;
+      }
+      png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, (png_size_t)6);
+   }
+   else
+   {
+      if (back->gray >= (1 << png_ptr->bit_depth))
+      {
+         png_warning(png_ptr,
+           "Ignoring attempt to write bKGD chunk out-of-range for bit_depth");
+         return;
+      }
+      png_save_uint_16(buf, back->gray);
+      png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, (png_size_t)2);
+   }
+}
+#endif
+
+#ifdef PNG_WRITE_hIST_SUPPORTED
+/* Write the histogram */
+void /* PRIVATE */
+png_write_hIST(png_structp png_ptr, png_uint_16p hist, int num_hist)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+   PNG_hIST;
+#endif
+   int i;
+   png_byte buf[3];
+
+   png_debug(1, "in png_write_hIST");
+
+   if (num_hist > (int)png_ptr->num_palette)
+   {
+      png_debug2(3, "num_hist = %d, num_palette = %d", num_hist,
+         png_ptr->num_palette);
+      png_warning(png_ptr, "Invalid number of histogram entries specified");
+      return;
+   }
+
+   png_write_chunk_start(png_ptr, (png_bytep)png_hIST,
+     (png_uint_32)(num_hist * 2));
+   for (i = 0; i < num_hist; i++)
+   {
+      png_save_uint_16(buf, hist[i]);
+      png_write_chunk_data(png_ptr, buf, (png_size_t)2);
+   }
+   png_write_chunk_end(png_ptr);
+}
+#endif
+
+#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
+    defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
+/* Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification,
+ * and if invalid, correct the keyword rather than discarding the entire
+ * chunk.  The PNG 1.0 specification requires keywords 1-79 characters in
+ * length, forbids leading or trailing whitespace, multiple internal spaces,
+ * and the non-break space (0x80) from ISO 8859-1.  Returns keyword length.
+ *
+ * The new_key is allocated to hold the corrected keyword and must be freed
+ * by the calling routine.  This avoids problems with trying to write to
+ * static keywords without having to have duplicate copies of the strings.
+ */
+png_size_t /* PRIVATE */
+png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
+{
+   png_size_t key_len;
+   png_charp kp, dp;
+   int kflag;
+   int kwarn=0;
+
+   png_debug(1, "in png_check_keyword");
+
+   *new_key = NULL;
+
+   if (key == NULL || (key_len = png_strlen(key)) == 0)
+   {
+      png_warning(png_ptr, "zero length keyword");
+      return ((png_size_t)0);
+   }
+
+   png_debug1(2, "Keyword to be checked is '%s'", key);
+
+   *new_key = (png_charp)png_malloc_warn(png_ptr, (png_uint_32)(key_len + 2));
+   if (*new_key == NULL)
+   {
+      png_warning(png_ptr, "Out of memory while procesing keyword");
+      return ((png_size_t)0);
+   }
+
+   /* Replace non-printing characters with a blank and print a warning */
+   for (kp = key, dp = *new_key; *kp != '\0'; kp++, dp++)
+   {
+      if ((png_byte)*kp < 0x20 ||
+         ((png_byte)*kp > 0x7E && (png_byte)*kp < 0xA1))
+      {
+#if defined(PNG_STDIO_SUPPORTED) && !defined(_WIN32_WCE)
+         char msg[40];
+
+         png_snprintf(msg, 40,
+           "invalid keyword character 0x%02X", (png_byte)*kp);
+         png_warning(png_ptr, msg);
+#else
+         png_warning(png_ptr, "invalid character in keyword");
+#endif
+         *dp = ' ';
+      }
+      else
+      {
+         *dp = *kp;
+      }
+   }
+   *dp = '\0';
+
+   /* Remove any trailing white space. */
+   kp = *new_key + key_len - 1;
+   if (*kp == ' ')
+   {
+      png_warning(png_ptr, "trailing spaces removed from keyword");
+
+      while (*kp == ' ')
+      {
+         *(kp--) = '\0';
+         key_len--;
+      }
+   }
+
+   /* Remove any leading white space. */
+   kp = *new_key;
+   if (*kp == ' ')
+   {
+      png_warning(png_ptr, "leading spaces removed from keyword");
+
+      while (*kp == ' ')
+      {
+         kp++;
+         key_len--;
+      }
+   }
+
+   png_debug1(2, "Checking for multiple internal spaces in '%s'", kp);
+
+   /* Remove multiple internal spaces. */
+   for (kflag = 0, dp = *new_key; *kp != '\0'; kp++)
+   {
+      if (*kp == ' ' && kflag == 0)
+      {
+         *(dp++) = *kp;
+         kflag = 1;
+      }
+      else if (*kp == ' ')
+      {
+         key_len--;
+         kwarn=1;
+      }
+      else
+      {
+         *(dp++) = *kp;
+         kflag = 0;
+      }
+   }
+   *dp = '\0';
+   if (kwarn)
+      png_warning(png_ptr, "extra interior spaces removed from keyword");
+
+   if (key_len == 0)
+   {
+      png_free(png_ptr, *new_key);
+       *new_key=NULL;
+      png_warning(png_ptr, "Zero length keyword");
+   }
+
+   if (key_len > 79)
+   {
+      png_warning(png_ptr, "keyword length must be 1 - 79 characters");
+      (*new_key)[79] = '\0';
+      key_len = 79;
+   }
+
+   return (key_len);
+}
+#endif
+
+#ifdef PNG_WRITE_tEXt_SUPPORTED
+/* Write a tEXt chunk */
+void /* PRIVATE */
+png_write_tEXt(png_structp png_ptr, png_charp key, png_charp text,
+   png_size_t text_len)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+   PNG_tEXt;
+#endif
+   png_size_t key_len;
+   png_charp new_key;
+
+   png_debug(1, "in png_write_tEXt");
+
+   if ((key_len = png_check_keyword(png_ptr, key, &new_key))==0)
+      return;
+
+   if (text == NULL || *text == '\0')
+      text_len = 0;
+   else
+      text_len = png_strlen(text);
+
+   /* Make sure we include the 0 after the key */
+   png_write_chunk_start(png_ptr, (png_bytep)png_tEXt,
+      (png_uint_32)(key_len + text_len + 1));
+   /*
+    * We leave it to the application to meet PNG-1.0 requirements on the
+    * contents of the text.  PNG-1.0 through PNG-1.2 discourage the use of
+    * any non-Latin-1 characters except for NEWLINE.  ISO PNG will forbid them.
+    * The NUL character is forbidden by PNG-1.0 through PNG-1.2 and ISO PNG.
+    */
+   png_write_chunk_data(png_ptr, (png_bytep)new_key,
+     (png_size_t)(key_len + 1));
+   if (text_len)
+      png_write_chunk_data(png_ptr, (png_bytep)text, (png_size_t)text_len);
+
+   png_write_chunk_end(png_ptr);
+   png_free(png_ptr, new_key);
+}
+#endif
+
+#ifdef PNG_WRITE_zTXt_SUPPORTED
+/* Write a compressed text chunk */
+void /* PRIVATE */
+png_write_zTXt(png_structp png_ptr, png_charp key, png_charp text,
+   png_size_t text_len, int compression)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+   PNG_zTXt;
+#endif
+   png_size_t key_len;
+   char buf[1];
+   png_charp new_key;
+   compression_state comp;
+
+   png_debug(1, "in png_write_zTXt");
+
+   comp.num_output_ptr = 0;
+   comp.max_output_ptr = 0;
+   comp.output_ptr = NULL;
+   comp.input = NULL;
+   comp.input_len = 0;
+
+   if ((key_len = png_check_keyword(png_ptr, key, &new_key))==0)
+   {
+      png_free(png_ptr, new_key);
+      return;
+   }
+
+   if (text == NULL || *text == '\0' || compression==PNG_TEXT_COMPRESSION_NONE)
+   {
+      png_write_tEXt(png_ptr, new_key, text, (png_size_t)0);
+      png_free(png_ptr, new_key);
+      return;
+   }
+
+   text_len = png_strlen(text);
+
+   /* Compute the compressed data; do it now for the length */
+   text_len = png_text_compress(png_ptr, text, text_len, compression,
+       &comp);
+
+   /* Write start of chunk */
+   png_write_chunk_start(png_ptr, (png_bytep)png_zTXt,
+     (png_uint_32)(key_len+text_len + 2));
+   /* Write key */
+   png_write_chunk_data(png_ptr, (png_bytep)new_key,
+     (png_size_t)(key_len + 1));
+   png_free(png_ptr, new_key);
+
+   buf[0] = (png_byte)compression;
+   /* Write compression */
+   png_write_chunk_data(png_ptr, (png_bytep)buf, (png_size_t)1);
+   /* Write the compressed data */
+   png_write_compressed_data_out(png_ptr, &comp);
+
+   /* Close the chunk */
+   png_write_chunk_end(png_ptr);
+}
+#endif
+
+#ifdef PNG_WRITE_iTXt_SUPPORTED
+/* Write an iTXt chunk */
+void /* PRIVATE */
+png_write_iTXt(png_structp png_ptr, int compression, png_charp key,
+    png_charp lang, png_charp lang_key, png_charp text)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+   PNG_iTXt;
+#endif
+   png_size_t lang_len, key_len, lang_key_len, text_len;
+   png_charp new_lang;
+   png_charp new_key = NULL;
+   png_byte cbuf[2];
+   compression_state comp;
+
+   png_debug(1, "in png_write_iTXt");
+
+   comp.num_output_ptr = 0;
+   comp.max_output_ptr = 0;
+   comp.output_ptr = NULL;
+   comp.input = NULL;
+
+   if ((key_len = png_check_keyword(png_ptr, key, &new_key))==0)
+      return;
+
+   if ((lang_len = png_check_keyword(png_ptr, lang, &new_lang))==0)
+   {
+      png_warning(png_ptr, "Empty language field in iTXt chunk");
+      new_lang = NULL;
+      lang_len = 0;
+   }
+
+   if (lang_key == NULL)
+      lang_key_len = 0;
+   else
+      lang_key_len = png_strlen(lang_key);
+
+   if (text == NULL)
+      text_len = 0;
+   else
+      text_len = png_strlen(text);
+
+   /* Compute the compressed data; do it now for the length */
+   text_len = png_text_compress(png_ptr, text, text_len, compression-2,
+      &comp);
+
+
+   /* Make sure we include the compression flag, the compression byte,
+    * and the NULs after the key, lang, and lang_key parts */
+
+   png_write_chunk_start(png_ptr, (png_bytep)png_iTXt,
+          (png_uint_32)(
+        5 /* comp byte, comp flag, terminators for key, lang and lang_key */
+        + key_len
+        + lang_len
+        + lang_key_len
+        + text_len));
+
+   /* We leave it to the application to meet PNG-1.0 requirements on the
+    * contents of the text.  PNG-1.0 through PNG-1.2 discourage the use of
+    * any non-Latin-1 characters except for NEWLINE.  ISO PNG will forbid them.
+    * The NUL character is forbidden by PNG-1.0 through PNG-1.2 and ISO PNG.
+    */
+   png_write_chunk_data(png_ptr, (png_bytep)new_key,
+     (png_size_t)(key_len + 1));
+
+   /* Set the compression flag */
+   if (compression == PNG_ITXT_COMPRESSION_NONE || \
+       compression == PNG_TEXT_COMPRESSION_NONE)
+       cbuf[0] = 0;
+   else /* compression == PNG_ITXT_COMPRESSION_zTXt */
+       cbuf[0] = 1;
+   /* Set the compression method */
+   cbuf[1] = 0;
+   png_write_chunk_data(png_ptr, cbuf, (png_size_t)2);
+
+   cbuf[0] = 0;
+   png_write_chunk_data(png_ptr, (new_lang ? (png_bytep)new_lang : cbuf),
+     (png_size_t)(lang_len + 1));
+   png_write_chunk_data(png_ptr, (lang_key ? (png_bytep)lang_key : cbuf),
+     (png_size_t)(lang_key_len + 1));
+   png_write_compressed_data_out(png_ptr, &comp);
+
+   png_write_chunk_end(png_ptr);
+   png_free(png_ptr, new_key);
+   png_free(png_ptr, new_lang);
+}
+#endif
+
+#ifdef PNG_WRITE_oFFs_SUPPORTED
+/* Write the oFFs chunk */
+void /* PRIVATE */
+png_write_oFFs(png_structp png_ptr, png_int_32 x_offset, png_int_32 y_offset,
+   int unit_type)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+   PNG_oFFs;
+#endif
+   png_byte buf[9];
+
+   png_debug(1, "in png_write_oFFs");
+
+   if (unit_type >= PNG_OFFSET_LAST)
+      png_warning(png_ptr, "Unrecognized unit type for oFFs chunk");
+
+   png_save_int_32(buf, x_offset);
+   png_save_int_32(buf + 4, y_offset);
+   buf[8] = (png_byte)unit_type;
+
+   png_write_chunk(png_ptr, (png_bytep)png_oFFs, buf, (png_size_t)9);
+}
+#endif
+#ifdef PNG_WRITE_pCAL_SUPPORTED
+/* Write the pCAL chunk (described in the PNG extensions document) */
+void /* PRIVATE */
+png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0,
+   png_int_32 X1, int type, int nparams, png_charp units, png_charpp params)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+   PNG_pCAL;
+#endif
+   png_size_t purpose_len, units_len, total_len;
+   png_uint_32p params_len;
+   png_byte buf[10];
+   png_charp new_purpose;
+   int i;
+
+   png_debug1(1, "in png_write_pCAL (%d parameters)", nparams);
+
+   if (type >= PNG_EQUATION_LAST)
+      png_warning(png_ptr, "Unrecognized equation type for pCAL chunk");
+
+   purpose_len = png_check_keyword(png_ptr, purpose, &new_purpose) + 1;
+   png_debug1(3, "pCAL purpose length = %d", (int)purpose_len);
+   units_len = png_strlen(units) + (nparams == 0 ? 0 : 1);
+   png_debug1(3, "pCAL units length = %d", (int)units_len);
+   total_len = purpose_len + units_len + 10;
+
+   params_len = (png_uint_32p)png_malloc(png_ptr,
+      (png_uint_32)(nparams * png_sizeof(png_uint_32)));
+
+   /* Find the length of each parameter, making sure we don't count the
+      null terminator for the last parameter. */
+   for (i = 0; i < nparams; i++)
+   {
+      params_len[i] = png_strlen(params[i]) + (i == nparams - 1 ? 0 : 1);
+      png_debug2(3, "pCAL parameter %d length = %lu", i,
+        (unsigned long) params_len[i]);
+      total_len += (png_size_t)params_len[i];
+   }
+
+   png_debug1(3, "pCAL total length = %d", (int)total_len);
+   png_write_chunk_start(png_ptr, (png_bytep)png_pCAL, (png_uint_32)total_len);
+   png_write_chunk_data(png_ptr, (png_bytep)new_purpose,
+     (png_size_t)purpose_len);
+   png_save_int_32(buf, X0);
+   png_save_int_32(buf + 4, X1);
+   buf[8] = (png_byte)type;
+   buf[9] = (png_byte)nparams;
+   png_write_chunk_data(png_ptr, buf, (png_size_t)10);
+   png_write_chunk_data(png_ptr, (png_bytep)units, (png_size_t)units_len);
+
+   png_free(png_ptr, new_purpose);
+
+   for (i = 0; i < nparams; i++)
+   {
+      png_write_chunk_data(png_ptr, (png_bytep)params[i],
+         (png_size_t)params_len[i]);
+   }
+
+   png_free(png_ptr, params_len);
+   png_write_chunk_end(png_ptr);
+}
+#endif
+
+#ifdef PNG_WRITE_sCAL_SUPPORTED
+/* Write the sCAL chunk */
+#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_STDIO_SUPPORTED)
+void /* PRIVATE */
+png_write_sCAL(png_structp png_ptr, int unit, double width, double height)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+   PNG_sCAL;
+#endif
+   char buf[64];
+   png_size_t total_len;
+
+   png_debug(1, "in png_write_sCAL");
+
+   buf[0] = (char)unit;
+#ifdef _WIN32_WCE
+/* sprintf() function is not supported on WindowsCE */
+   {
+      wchar_t wc_buf[32];
+      size_t wc_len;
+      swprintf(wc_buf, TEXT("%12.12e"), width);
+      wc_len = wcslen(wc_buf);
+      WideCharToMultiByte(CP_ACP, 0, wc_buf, -1, buf + 1, wc_len, NULL,
+          NULL);
+      total_len = wc_len + 2;
+      swprintf(wc_buf, TEXT("%12.12e"), height);
+      wc_len = wcslen(wc_buf);
+      WideCharToMultiByte(CP_ACP, 0, wc_buf, -1, buf + total_len, wc_len,
+         NULL, NULL);
+      total_len += wc_len;
+   }
+#else
+   png_snprintf(buf + 1, 63, "%12.12e", width);
+   total_len = 1 + png_strlen(buf + 1) + 1;
+   png_snprintf(buf + total_len, 64-total_len, "%12.12e", height);
+   total_len += png_strlen(buf + total_len);
+#endif
+
+   png_debug1(3, "sCAL total length = %u", (unsigned int)total_len);
+   png_write_chunk(png_ptr, (png_bytep)png_sCAL, (png_bytep)buf, total_len);
+}
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+void /* PRIVATE */
+png_write_sCAL_s(png_structp png_ptr, int unit, png_charp width,
+   png_charp height)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+   PNG_sCAL;
+#endif
+   png_byte buf[64];
+   png_size_t wlen, hlen, total_len;
+
+   png_debug(1, "in png_write_sCAL_s");
+
+   wlen = png_strlen(width);
+   hlen = png_strlen(height);
+   total_len = wlen + hlen + 2;
+   if (total_len > 64)
+   {
+      png_warning(png_ptr, "Can't write sCAL (buffer too small)");
+      return;
+   }
+
+   buf[0] = (png_byte)unit;
+   png_memcpy(buf + 1, width, wlen + 1);      /* Append the '\0' here */
+   png_memcpy(buf + wlen + 2, height, hlen);  /* Do NOT append the '\0' here */
+
+   png_debug1(3, "sCAL total length = %u", (unsigned int)total_len);
+   png_write_chunk(png_ptr, (png_bytep)png_sCAL, buf, total_len);
+}
+#endif
+#endif
+#endif
+
+#ifdef PNG_WRITE_pHYs_SUPPORTED
+/* Write the pHYs chunk */
+void /* PRIVATE */
+png_write_pHYs(png_structp png_ptr, png_uint_32 x_pixels_per_unit,
+   png_uint_32 y_pixels_per_unit,
+   int unit_type)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+   PNG_pHYs;
+#endif
+   png_byte buf[9];
+
+   png_debug(1, "in png_write_pHYs");
+
+   if (unit_type >= PNG_RESOLUTION_LAST)
+      png_warning(png_ptr, "Unrecognized unit type for pHYs chunk");
+
+   png_save_uint_32(buf, x_pixels_per_unit);
+   png_save_uint_32(buf + 4, y_pixels_per_unit);
+   buf[8] = (png_byte)unit_type;
+
+   png_write_chunk(png_ptr, (png_bytep)png_pHYs, buf, (png_size_t)9);
+}
+#endif
+
+#ifdef PNG_WRITE_tIME_SUPPORTED
+/* Write the tIME chunk.  Use either png_convert_from_struct_tm()
+ * or png_convert_from_time_t(), or fill in the structure yourself.
+ */
+void /* PRIVATE */
+png_write_tIME(png_structp png_ptr, png_timep mod_time)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+   PNG_tIME;
+#endif
+   png_byte buf[7];
+
+   png_debug(1, "in png_write_tIME");
+
+   if (mod_time->month  > 12 || mod_time->month  < 1 ||
+       mod_time->day    > 31 || mod_time->day    < 1 ||
+       mod_time->hour   > 23 || mod_time->second > 60)
+   {
+      png_warning(png_ptr, "Invalid time specified for tIME chunk");
+      return;
+   }
+
+   png_save_uint_16(buf, mod_time->year);
+   buf[2] = mod_time->month;
+   buf[3] = mod_time->day;
+   buf[4] = mod_time->hour;
+   buf[5] = mod_time->minute;
+   buf[6] = mod_time->second;
+
+   png_write_chunk(png_ptr, (png_bytep)png_tIME, buf, (png_size_t)7);
+}
+#endif
+
+/* Initializes the row writing capability of libpng */
+void /* PRIVATE */
+png_write_start_row(png_structp png_ptr)
+{
+#ifdef PNG_WRITE_INTERLACING_SUPPORTED
+   /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+
+   /* Start of interlace block */
+   int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
+
+   /* Offset to next interlace block */
+   int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
+
+   /* Start of interlace block in the y direction */
+   int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
+
+   /* Offset to next interlace block in the y direction */
+   int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
+#endif
+
+   png_size_t buf_size;
+
+   png_debug(1, "in png_write_start_row");
+
+   buf_size = (png_size_t)(PNG_ROWBYTES(
+      png_ptr->usr_channels*png_ptr->usr_bit_depth, png_ptr->width) + 1);
+
+   /* Set up row buffer */
+   png_ptr->row_buf = (png_bytep)png_malloc(png_ptr,
+     (png_uint_32)buf_size);
+   png_ptr->row_buf[0] = PNG_FILTER_VALUE_NONE;
+
+#ifdef PNG_WRITE_FILTER_SUPPORTED
+   /* Set up filtering buffer, if using this filter */
+   if (png_ptr->do_filter & PNG_FILTER_SUB)
+   {
+      png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,
+         (png_uint_32)(png_ptr->rowbytes + 1));
+      png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;
+   }
+
+   /* We only need to keep the previous row if we are using one of these. */
+   if (png_ptr->do_filter & (PNG_FILTER_AVG | PNG_FILTER_UP | PNG_FILTER_PAETH))
+   {
+      /* Set up previous row buffer */
+      png_ptr->prev_row = (png_bytep)png_calloc(png_ptr,
+         (png_uint_32)buf_size);
+
+      if (png_ptr->do_filter & PNG_FILTER_UP)
+      {
+         png_ptr->up_row = (png_bytep)png_malloc(png_ptr,
+            (png_uint_32)(png_ptr->rowbytes + 1));
+         png_ptr->up_row[0] = PNG_FILTER_VALUE_UP;
+      }
+
+      if (png_ptr->do_filter & PNG_FILTER_AVG)
+      {
+         png_ptr->avg_row = (png_bytep)png_malloc(png_ptr,
+            (png_uint_32)(png_ptr->rowbytes + 1));
+         png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG;
+      }
+
+      if (png_ptr->do_filter & PNG_FILTER_PAETH)
+      {
+         png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr,
+            (png_uint_32)(png_ptr->rowbytes + 1));
+         png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;
+      }
+   }
+#endif /* PNG_WRITE_FILTER_SUPPORTED */
+
+#ifdef PNG_WRITE_INTERLACING_SUPPORTED
+   /* If interlaced, we need to set up width and height of pass */
+   if (png_ptr->interlaced)
+   {
+      if (!(png_ptr->transformations & PNG_INTERLACE))
+      {
+         png_ptr->num_rows = (png_ptr->height + png_pass_yinc[0] - 1 -
+            png_pass_ystart[0]) / png_pass_yinc[0];
+         png_ptr->usr_width = (png_ptr->width + png_pass_inc[0] - 1 -
+            png_pass_start[0]) / png_pass_inc[0];
+      }
+      else
+      {
+         png_ptr->num_rows = png_ptr->height;
+         png_ptr->usr_width = png_ptr->width;
+      }
+   }
+   else
+#endif
+   {
+      png_ptr->num_rows = png_ptr->height;
+      png_ptr->usr_width = png_ptr->width;
+   }
+   png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+   png_ptr->zstream.next_out = png_ptr->zbuf;
+}
+
+/* Internal use only.  Called when finished processing a row of data. */
+void /* PRIVATE */
+png_write_finish_row(png_structp png_ptr)
+{
+#ifdef PNG_WRITE_INTERLACING_SUPPORTED
+   /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+
+   /* Start of interlace block */
+   int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
+
+   /* Offset to next interlace block */
+   int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
+
+   /* Start of interlace block in the y direction */
+   int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
+
+   /* Offset to next interlace block in the y direction */
+   int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
+#endif
+
+   int ret;
+
+   png_debug(1, "in png_write_finish_row");
+
+   /* Next row */
+   png_ptr->row_number++;
+
+   /* See if we are done */
+   if (png_ptr->row_number < png_ptr->num_rows)
+      return;
+
+#ifdef PNG_WRITE_INTERLACING_SUPPORTED
+   /* If interlaced, go to next pass */
+   if (png_ptr->interlaced)
+   {
+      png_ptr->row_number = 0;
+      if (png_ptr->transformations & PNG_INTERLACE)
+      {
+         png_ptr->pass++;
+      }
+      else
+      {
+         /* Loop until we find a non-zero width or height pass */
+         do
+         {
+            png_ptr->pass++;
+            if (png_ptr->pass >= 7)
+               break;
+            png_ptr->usr_width = (png_ptr->width +
+               png_pass_inc[png_ptr->pass] - 1 -
+               png_pass_start[png_ptr->pass]) /
+               png_pass_inc[png_ptr->pass];
+            png_ptr->num_rows = (png_ptr->height +
+               png_pass_yinc[png_ptr->pass] - 1 -
+               png_pass_ystart[png_ptr->pass]) /
+               png_pass_yinc[png_ptr->pass];
+            if (png_ptr->transformations & PNG_INTERLACE)
+               break;
+         } while (png_ptr->usr_width == 0 || png_ptr->num_rows == 0);
+
+      }
+
+      /* Reset the row above the image for the next pass */
+      if (png_ptr->pass < 7)
+      {
+         if (png_ptr->prev_row != NULL)
+            png_memset(png_ptr->prev_row, 0,
+               (png_size_t)(PNG_ROWBYTES(png_ptr->usr_channels*
+               png_ptr->usr_bit_depth, png_ptr->width)) + 1);
+         return;
+      }
+   }
+#endif
+
+   /* If we get here, we've just written the last row, so we need
+      to flush the compressor */
+   do
+   {
+      /* Tell the compressor we are done */
+      ret = deflate(&png_ptr->zstream, Z_FINISH);
+      /* Check for an error */
+      if (ret == Z_OK)
+      {
+         /* Check to see if we need more room */
+         if (!(png_ptr->zstream.avail_out))
+         {
+            png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size);
+            png_ptr->zstream.next_out = png_ptr->zbuf;
+            png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+         }
+      }
+      else if (ret != Z_STREAM_END)
+      {
+         if (png_ptr->zstream.msg != NULL)
+            png_error(png_ptr, png_ptr->zstream.msg);
+         else
+            png_error(png_ptr, "zlib error");
+      }
+   } while (ret != Z_STREAM_END);
+
+   /* Write any extra space */
+   if (png_ptr->zstream.avail_out < png_ptr->zbuf_size)
+   {
+      png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size -
+         png_ptr->zstream.avail_out);
+   }
+
+   deflateReset(&png_ptr->zstream);
+   png_ptr->zstream.data_type = Z_BINARY;
+}
+
+#ifdef PNG_WRITE_INTERLACING_SUPPORTED
+/* Pick out the correct pixels for the interlace pass.
+ * The basic idea here is to go through the row with a source
+ * pointer and a destination pointer (sp and dp), and copy the
+ * correct pixels for the pass.  As the row gets compacted,
+ * sp will always be >= dp, so we should never overwrite anything.
+ * See the default: case for the easiest code to understand.
+ */
+void /* PRIVATE */
+png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
+{
+   /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+
+   /* Start of interlace block */
+   int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
+
+   /* Offset to next interlace block */
+   int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
+
+   png_debug(1, "in png_do_write_interlace");
+
+   /* We don't have to do anything on the last pass (6) */
+#ifdef PNG_USELESS_TESTS_SUPPORTED
+   if (row != NULL && row_info != NULL && pass < 6)
+#else
+   if (pass < 6)
+#endif
+   {
+      /* Each pixel depth is handled separately */
+      switch (row_info->pixel_depth)
+      {
+         case 1:
+         {
+            png_bytep sp;
+            png_bytep dp;
+            int shift;
+            int d;
+            int value;
+            png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
+
+            dp = row;
+            d = 0;
+            shift = 7;
+            for (i = png_pass_start[pass]; i < row_width;
+               i += png_pass_inc[pass])
+            {
+               sp = row + (png_size_t)(i >> 3);
+               value = (int)(*sp >> (7 - (int)(i & 0x07))) & 0x01;
+               d |= (value << shift);
+
+               if (shift == 0)
+               {
+                  shift = 7;
+                  *dp++ = (png_byte)d;
+                  d = 0;
+               }
+               else
+                  shift--;
+
+            }
+            if (shift != 7)
+               *dp = (png_byte)d;
+            break;
+         }
+         case 2:
+         {
+            png_bytep sp;
+            png_bytep dp;
+            int shift;
+            int d;
+            int value;
+            png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
+
+            dp = row;
+            shift = 6;
+            d = 0;
+            for (i = png_pass_start[pass]; i < row_width;
+               i += png_pass_inc[pass])
+            {
+               sp = row + (png_size_t)(i >> 2);
+               value = (*sp >> ((3 - (int)(i & 0x03)) << 1)) & 0x03;
+               d |= (value << shift);
+
+               if (shift == 0)
+               {
+                  shift = 6;
+                  *dp++ = (png_byte)d;
+                  d = 0;
+               }
+               else
+                  shift -= 2;
+            }
+            if (shift != 6)
+                   *dp = (png_byte)d;
+            break;
+         }
+         case 4:
+         {
+            png_bytep sp;
+            png_bytep dp;
+            int shift;
+            int d;
+            int value;
+            png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
+
+            dp = row;
+            shift = 4;
+            d = 0;
+            for (i = png_pass_start[pass]; i < row_width;
+               i += png_pass_inc[pass])
+            {
+               sp = row + (png_size_t)(i >> 1);
+               value = (*sp >> ((1 - (int)(i & 0x01)) << 2)) & 0x0f;
+               d |= (value << shift);
+
+               if (shift == 0)
+               {
+                  shift = 4;
+                  *dp++ = (png_byte)d;
+                  d = 0;
+               }
+               else
+                  shift -= 4;
+            }
+            if (shift != 4)
+               *dp = (png_byte)d;
+            break;
+         }
+         default:
+         {
+            png_bytep sp;
+            png_bytep dp;
+            png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
+            png_size_t pixel_bytes;
+
+            /* Start at the beginning */
+            dp = row;
+            /* Find out how many bytes each pixel takes up */
+            pixel_bytes = (row_info->pixel_depth >> 3);
+            /* Loop through the row, only looking at the pixels that
+               matter */
+            for (i = png_pass_start[pass]; i < row_width;
+               i += png_pass_inc[pass])
+            {
+               /* Find out where the original pixel is */
+               sp = row + (png_size_t)i * pixel_bytes;
+               /* Move the pixel */
+               if (dp != sp)
+                  png_memcpy(dp, sp, pixel_bytes);
+               /* Next pixel */
+               dp += pixel_bytes;
+            }
+            break;
+         }
+      }
+      /* Set new row width */
+      row_info->width = (row_info->width +
+         png_pass_inc[pass] - 1 -
+         png_pass_start[pass]) /
+         png_pass_inc[pass];
+         row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth,
+            row_info->width);
+   }
+}
+#endif
+
+/* This filters the row, chooses which filter to use, if it has not already
+ * been specified by the application, and then writes the row out with the
+ * chosen filter.
+ */
+#define PNG_MAXSUM (((png_uint_32)(-1)) >> 1)
+#define PNG_HISHIFT 10
+#define PNG_LOMASK ((png_uint_32)0xffffL)
+#define PNG_HIMASK ((png_uint_32)(~PNG_LOMASK >> PNG_HISHIFT))
+void /* PRIVATE */
+png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
+{
+   png_bytep best_row;
+#ifdef PNG_WRITE_FILTER_SUPPORTED
+   png_bytep prev_row, row_buf;
+   png_uint_32 mins, bpp;
+   png_byte filter_to_do = png_ptr->do_filter;
+   png_uint_32 row_bytes = row_info->rowbytes;
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
+   int num_p_filters = (int)png_ptr->num_prev_filters;
+#endif 
+
+   png_debug(1, "in png_write_find_filter");
+
+#ifndef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
+  if (png_ptr->row_number == 0 && filter_to_do == PNG_ALL_FILTERS)
+  {
+      /* These will never be selected so we need not test them. */
+      filter_to_do &= ~(PNG_FILTER_UP | PNG_FILTER_PAETH);
+  }
+#endif 
+
+   /* Find out how many bytes offset each pixel is */
+   bpp = (row_info->pixel_depth + 7) >> 3;
+
+   prev_row = png_ptr->prev_row;
+#endif
+   best_row = png_ptr->row_buf;
+#ifdef PNG_WRITE_FILTER_SUPPORTED
+   row_buf = best_row;
+   mins = PNG_MAXSUM;
+
+   /* The prediction method we use is to find which method provides the
+    * smallest value when summing the absolute values of the distances
+    * from zero, using anything >= 128 as negative numbers.  This is known
+    * as the "minimum sum of absolute differences" heuristic.  Other
+    * heuristics are the "weighted minimum sum of absolute differences"
+    * (experimental and can in theory improve compression), and the "zlib
+    * predictive" method (not implemented yet), which does test compressions
+    * of lines using different filter methods, and then chooses the
+    * (series of) filter(s) that give minimum compressed data size (VERY
+    * computationally expensive).
+    *
+    * GRR 980525:  consider also
+    *   (1) minimum sum of absolute differences from running average (i.e.,
+    *       keep running sum of non-absolute differences & count of bytes)
+    *       [track dispersion, too?  restart average if dispersion too large?]
+    *  (1b) minimum sum of absolute differences from sliding average, probably
+    *       with window size <= deflate window (usually 32K)
+    *   (2) minimum sum of squared differences from zero or running average
+    *       (i.e., ~ root-mean-square approach)
+    */
+
+
+   /* We don't need to test the 'no filter' case if this is the only filter
+    * that has been chosen, as it doesn't actually do anything to the data.
+    */
+   if ((filter_to_do & PNG_FILTER_NONE) &&
+       filter_to_do != PNG_FILTER_NONE)
+   {
+      png_bytep rp;
+      png_uint_32 sum = 0;
+      png_uint_32 i;
+      int v;
+
+      for (i = 0, rp = row_buf + 1; i < row_bytes; i++, rp++)
+      {
+         v = *rp;
+         sum += (v < 128) ? v : 256 - v;
+      }
+
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
+      if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
+      {
+         png_uint_32 sumhi, sumlo;
+         int j;
+         sumlo = sum & PNG_LOMASK;
+         sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK; /* Gives us some footroom */
+
+         /* Reduce the sum if we match any of the previous rows */
+         for (j = 0; j < num_p_filters; j++)
+         {
+            if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_NONE)
+            {
+               sumlo = (sumlo * png_ptr->filter_weights[j]) >>
+                  PNG_WEIGHT_SHIFT;
+               sumhi = (sumhi * png_ptr->filter_weights[j]) >>
+                  PNG_WEIGHT_SHIFT;
+            }
+         }
+
+         /* Factor in the cost of this filter (this is here for completeness,
+          * but it makes no sense to have a "cost" for the NONE filter, as
+          * it has the minimum possible computational cost - none).
+          */
+         sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_NONE]) >>
+            PNG_COST_SHIFT;
+         sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_NONE]) >>
+            PNG_COST_SHIFT;
+
+         if (sumhi > PNG_HIMASK)
+            sum = PNG_MAXSUM;
+         else
+            sum = (sumhi << PNG_HISHIFT) + sumlo;
+      }
+#endif
+      mins = sum;
+   }
+
+   /* Sub filter */
+   if (filter_to_do == PNG_FILTER_SUB)
+   /* It's the only filter so no testing is needed */
+   {
+      png_bytep rp, lp, dp;
+      png_uint_32 i;
+      for (i = 0, rp = row_buf + 1, dp = png_ptr->sub_row + 1; i < bpp;
+           i++, rp++, dp++)
+      {
+         *dp = *rp;
+      }
+      for (lp = row_buf + 1; i < row_bytes;
+         i++, rp++, lp++, dp++)
+      {
+         *dp = (png_byte)(((int)*rp - (int)*lp) & 0xff);
+      }
+      best_row = png_ptr->sub_row;
+   }
+
+   else if (filter_to_do & PNG_FILTER_SUB)
+   {
+      png_bytep rp, dp, lp;
+      png_uint_32 sum = 0, lmins = mins;
+      png_uint_32 i;
+      int v;
+
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
+      /* We temporarily increase the "minimum sum" by the factor we
+       * would reduce the sum of this filter, so that we can do the
+       * early exit comparison without scaling the sum each time.
+       */
+      if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
+      {
+         int j;
+         png_uint_32 lmhi, lmlo;
+         lmlo = lmins & PNG_LOMASK;
+         lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK;
+
+         for (j = 0; j < num_p_filters; j++)
+         {
+            if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_SUB)
+            {
+               lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >>
+                  PNG_WEIGHT_SHIFT;
+               lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >>
+                  PNG_WEIGHT_SHIFT;
+            }
+         }
+
+         lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >>
+            PNG_COST_SHIFT;
+         lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >>
+            PNG_COST_SHIFT;
+
+         if (lmhi > PNG_HIMASK)
+            lmins = PNG_MAXSUM;
+         else
+            lmins = (lmhi << PNG_HISHIFT) + lmlo;
+      }
+#endif
+
+      for (i = 0, rp = row_buf + 1, dp = png_ptr->sub_row + 1; i < bpp;
+           i++, rp++, dp++)
+      {
+         v = *dp = *rp;
+
+         sum += (v < 128) ? v : 256 - v;
+      }
+      for (lp = row_buf + 1; i < row_bytes;
+         i++, rp++, lp++, dp++)
+      {
+         v = *dp = (png_byte)(((int)*rp - (int)*lp) & 0xff);
+
+         sum += (v < 128) ? v : 256 - v;
+
+         if (sum > lmins)  /* We are already worse, don't continue. */
+            break;
+      }
+
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
+      if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
+      {
+         int j;
+         png_uint_32 sumhi, sumlo;
+         sumlo = sum & PNG_LOMASK;
+         sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK;
+
+         for (j = 0; j < num_p_filters; j++)
+         {
+            if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_SUB)
+            {
+               sumlo = (sumlo * png_ptr->inv_filter_weights[j]) >>
+                  PNG_WEIGHT_SHIFT;
+               sumhi = (sumhi * png_ptr->inv_filter_weights[j]) >>
+                  PNG_WEIGHT_SHIFT;
+            }
+         }
+
+         sumlo = (sumlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >>
+            PNG_COST_SHIFT;
+         sumhi = (sumhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >>
+            PNG_COST_SHIFT;
+
+         if (sumhi > PNG_HIMASK)
+            sum = PNG_MAXSUM;
+         else
+            sum = (sumhi << PNG_HISHIFT) + sumlo;
+      }
+#endif
+
+      if (sum < mins)
+      {
+         mins = sum;
+         best_row = png_ptr->sub_row;
+      }
+   }
+
+   /* Up filter */
+   if (filter_to_do == PNG_FILTER_UP)
+   {
+      png_bytep rp, dp, pp;
+      png_uint_32 i;
+
+      for (i = 0, rp = row_buf + 1, dp = png_ptr->up_row + 1,
+           pp = prev_row + 1; i < row_bytes;
+           i++, rp++, pp++, dp++)
+      {
+         *dp = (png_byte)(((int)*rp - (int)*pp) & 0xff);
+      }
+      best_row = png_ptr->up_row;
+   }
+
+   else if (filter_to_do & PNG_FILTER_UP)
+   {
+      png_bytep rp, dp, pp;
+      png_uint_32 sum = 0, lmins = mins;
+      png_uint_32 i;
+      int v;
+
+
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
+      if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
+      {
+         int j;
+         png_uint_32 lmhi, lmlo;
+         lmlo = lmins & PNG_LOMASK;
+         lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK;
+
+         for (j = 0; j < num_p_filters; j++)
+         {
+            if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_UP)
+            {
+               lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >>
+                  PNG_WEIGHT_SHIFT;
+               lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >>
+                  PNG_WEIGHT_SHIFT;
+            }
+         }
+
+         lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_UP]) >>
+            PNG_COST_SHIFT;
+         lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_UP]) >>
+            PNG_COST_SHIFT;
+
+         if (lmhi > PNG_HIMASK)
+            lmins = PNG_MAXSUM;
+         else
+            lmins = (lmhi << PNG_HISHIFT) + lmlo;
+      }
+#endif
+
+      for (i = 0, rp = row_buf + 1, dp = png_ptr->up_row + 1,
+           pp = prev_row + 1; i < row_bytes; i++)
+      {
+         v = *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff);
+
+         sum += (v < 128) ? v : 256 - v;
+
+         if (sum > lmins)  /* We are already worse, don't continue. */
+            break;
+      }
+
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
+      if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
+      {
+         int j;
+         png_uint_32 sumhi, sumlo;
+         sumlo = sum & PNG_LOMASK;
+         sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK;
+
+         for (j = 0; j < num_p_filters; j++)
+         {
+            if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_UP)
+            {
+               sumlo = (sumlo * png_ptr->filter_weights[j]) >>
+                  PNG_WEIGHT_SHIFT;
+               sumhi = (sumhi * png_ptr->filter_weights[j]) >>
+                  PNG_WEIGHT_SHIFT;
+            }
+         }
+
+         sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_UP]) >>
+            PNG_COST_SHIFT;
+         sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_UP]) >>
+            PNG_COST_SHIFT;
+
+         if (sumhi > PNG_HIMASK)
+            sum = PNG_MAXSUM;
+         else
+            sum = (sumhi << PNG_HISHIFT) + sumlo;
+      }
+#endif
+
+      if (sum < mins)
+      {
+         mins = sum;
+         best_row = png_ptr->up_row;
+      }
+   }
+
+   /* Avg filter */
+   if (filter_to_do == PNG_FILTER_AVG)
+   {
+      png_bytep rp, dp, pp, lp;
+      png_uint_32 i;
+      for (i = 0, rp = row_buf + 1, dp = png_ptr->avg_row + 1,
+           pp = prev_row + 1; i < bpp; i++)
+      {
+         *dp++ = (png_byte)(((int)*rp++ - ((int)*pp++ / 2)) & 0xff);
+      }
+      for (lp = row_buf + 1; i < row_bytes; i++)
+      {
+         *dp++ = (png_byte)(((int)*rp++ - (((int)*pp++ + (int)*lp++) / 2))
+                 & 0xff);
+      }
+      best_row = png_ptr->avg_row;
+   }
+
+   else if (filter_to_do & PNG_FILTER_AVG)
+   {
+      png_bytep rp, dp, pp, lp;
+      png_uint_32 sum = 0, lmins = mins;
+      png_uint_32 i;
+      int v;
+
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
+      if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
+      {
+         int j;
+         png_uint_32 lmhi, lmlo;
+         lmlo = lmins & PNG_LOMASK;
+         lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK;
+
+         for (j = 0; j < num_p_filters; j++)
+         {
+            if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_AVG)
+            {
+               lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >>
+                  PNG_WEIGHT_SHIFT;
+               lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >>
+                  PNG_WEIGHT_SHIFT;
+            }
+         }
+
+         lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_AVG]) >>
+            PNG_COST_SHIFT;
+         lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_AVG]) >>
+            PNG_COST_SHIFT;
+
+         if (lmhi > PNG_HIMASK)
+            lmins = PNG_MAXSUM;
+         else
+            lmins = (lmhi << PNG_HISHIFT) + lmlo;
+      }
+#endif
+
+      for (i = 0, rp = row_buf + 1, dp = png_ptr->avg_row + 1,
+           pp = prev_row + 1; i < bpp; i++)
+      {
+         v = *dp++ = (png_byte)(((int)*rp++ - ((int)*pp++ / 2)) & 0xff);
+
+         sum += (v < 128) ? v : 256 - v;
+      }
+      for (lp = row_buf + 1; i < row_bytes; i++)
+      {
+         v = *dp++ =
+          (png_byte)(((int)*rp++ - (((int)*pp++ + (int)*lp++) / 2)) & 0xff);
+
+         sum += (v < 128) ? v : 256 - v;
+
+         if (sum > lmins)  /* We are already worse, don't continue. */
+            break;
+      }
+
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
+      if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
+      {
+         int j;
+         png_uint_32 sumhi, sumlo;
+         sumlo = sum & PNG_LOMASK;
+         sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK;
+
+         for (j = 0; j < num_p_filters; j++)
+         {
+            if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_NONE)
+            {
+               sumlo = (sumlo * png_ptr->filter_weights[j]) >>
+                  PNG_WEIGHT_SHIFT;
+               sumhi = (sumhi * png_ptr->filter_weights[j]) >>
+                  PNG_WEIGHT_SHIFT;
+            }
+         }
+
+         sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_AVG]) >>
+            PNG_COST_SHIFT;
+         sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_AVG]) >>
+            PNG_COST_SHIFT;
+
+         if (sumhi > PNG_HIMASK)
+            sum = PNG_MAXSUM;
+         else
+            sum = (sumhi << PNG_HISHIFT) + sumlo;
+      }
+#endif
+
+      if (sum < mins)
+      {
+         mins = sum;
+         best_row = png_ptr->avg_row;
+      }
+   }
+
+   /* Paeth filter */
+   if (filter_to_do == PNG_FILTER_PAETH)
+   {
+      png_bytep rp, dp, pp, cp, lp;
+      png_uint_32 i;
+      for (i = 0, rp = row_buf + 1, dp = png_ptr->paeth_row + 1,
+           pp = prev_row + 1; i < bpp; i++)
+      {
+         *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff);
+      }
+
+      for (lp = row_buf + 1, cp = prev_row + 1; i < row_bytes; i++)
+      {
+         int a, b, c, pa, pb, pc, p;
+
+         b = *pp++;
+         c = *cp++;
+         a = *lp++;
+
+         p = b - c;
+         pc = a - c;
+
+#ifdef PNG_USE_ABS
+         pa = abs(p);
+         pb = abs(pc);
+         pc = abs(p + pc);
+#else
+         pa = p < 0 ? -p : p;
+         pb = pc < 0 ? -pc : pc;
+         pc = (p + pc) < 0 ? -(p + pc) : p + pc;
+#endif
+
+         p = (pa <= pb && pa <=pc) ? a : (pb <= pc) ? b : c;
+
+         *dp++ = (png_byte)(((int)*rp++ - p) & 0xff);
+      }
+      best_row = png_ptr->paeth_row;
+   }
+
+   else if (filter_to_do & PNG_FILTER_PAETH)
+   {
+      png_bytep rp, dp, pp, cp, lp;
+      png_uint_32 sum = 0, lmins = mins;
+      png_uint_32 i;
+      int v;
+
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
+      if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
+      {
+         int j;
+         png_uint_32 lmhi, lmlo;
+         lmlo = lmins & PNG_LOMASK;
+         lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK;
+
+         for (j = 0; j < num_p_filters; j++)
+         {
+            if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_PAETH)
+            {
+               lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >>
+                  PNG_WEIGHT_SHIFT;
+               lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >>
+                  PNG_WEIGHT_SHIFT;
+            }
+         }
+
+         lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_PAETH]) >>
+            PNG_COST_SHIFT;
+         lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_PAETH]) >>
+            PNG_COST_SHIFT;
+
+         if (lmhi > PNG_HIMASK)
+            lmins = PNG_MAXSUM;
+         else
+            lmins = (lmhi << PNG_HISHIFT) + lmlo;
+      }
+#endif
+
+      for (i = 0, rp = row_buf + 1, dp = png_ptr->paeth_row + 1,
+           pp = prev_row + 1; i < bpp; i++)
+      {
+         v = *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff);
+
+         sum += (v < 128) ? v : 256 - v;
+      }
+
+      for (lp = row_buf + 1, cp = prev_row + 1; i < row_bytes; i++)
+      {
+         int a, b, c, pa, pb, pc, p;
+
+         b = *pp++;
+         c = *cp++;
+         a = *lp++;
+
+#ifndef PNG_SLOW_PAETH
+         p = b - c;
+         pc = a - c;
+#ifdef PNG_USE_ABS
+         pa = abs(p);
+         pb = abs(pc);
+         pc = abs(p + pc);
+#else
+         pa = p < 0 ? -p : p;
+         pb = pc < 0 ? -pc : pc;
+         pc = (p + pc) < 0 ? -(p + pc) : p + pc;
+#endif
+         p = (pa <= pb && pa <=pc) ? a : (pb <= pc) ? b : c;
+#else /* PNG_SLOW_PAETH */
+         p = a + b - c;
+         pa = abs(p - a);
+         pb = abs(p - b);
+         pc = abs(p - c);
+         if (pa <= pb && pa <= pc)
+            p = a;
+         else if (pb <= pc)
+            p = b;
+         else
+            p = c;
+#endif /* PNG_SLOW_PAETH */
+
+         v = *dp++ = (png_byte)(((int)*rp++ - p) & 0xff);
+
+         sum += (v < 128) ? v : 256 - v;
+
+         if (sum > lmins)  /* We are already worse, don't continue. */
+            break;
+      }
+
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
+      if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
+      {
+         int j;
+         png_uint_32 sumhi, sumlo;
+         sumlo = sum & PNG_LOMASK;
+         sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK;
+
+         for (j = 0; j < num_p_filters; j++)
+         {
+            if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_PAETH)
+            {
+               sumlo = (sumlo * png_ptr->filter_weights[j]) >>
+                  PNG_WEIGHT_SHIFT;
+               sumhi = (sumhi * png_ptr->filter_weights[j]) >>
+                  PNG_WEIGHT_SHIFT;
+            }
+         }
+
+         sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_PAETH]) >>
+            PNG_COST_SHIFT;
+         sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_PAETH]) >>
+            PNG_COST_SHIFT;
+
+         if (sumhi > PNG_HIMASK)
+            sum = PNG_MAXSUM;
+         else
+            sum = (sumhi << PNG_HISHIFT) + sumlo;
+      }
+#endif
+
+      if (sum < mins)
+      {
+         best_row = png_ptr->paeth_row;
+      }
+   }
+#endif /* PNG_WRITE_FILTER_SUPPORTED */
+   /* Do the actual writing of the filtered row data from the chosen filter. */
+
+   png_write_filtered_row(png_ptr, best_row);
+
+#ifdef PNG_WRITE_FILTER_SUPPORTED
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
+   /* Save the type of filter we picked this time for future calculations */
+   if (png_ptr->num_prev_filters > 0)
+   {
+      int j;
+      for (j = 1; j < num_p_filters; j++)
+      {
+         png_ptr->prev_filters[j] = png_ptr->prev_filters[j - 1];
+      }
+      png_ptr->prev_filters[j] = best_row[0];
+   }
+#endif
+#endif /* PNG_WRITE_FILTER_SUPPORTED */
+}
+
+
+/* Do the actual writing of a previously filtered row. */
+void /* PRIVATE */
+png_write_filtered_row(png_structp png_ptr, png_bytep filtered_row)
+{
+   png_debug(1, "in png_write_filtered_row");
+
+   png_debug1(2, "filter = %d", filtered_row[0]);
+   /* Set up the zlib input buffer */
+
+   png_ptr->zstream.next_in = filtered_row;
+   png_ptr->zstream.avail_in = (uInt)png_ptr->row_info.rowbytes + 1;
+   /* Repeat until we have compressed all the data */
+   do
+   {
+      int ret; /* Return of zlib */
+
+      /* Compress the data */
+      ret = deflate(&png_ptr->zstream, Z_NO_FLUSH);
+      /* Check for compression errors */
+      if (ret != Z_OK)
+      {
+         if (png_ptr->zstream.msg != NULL)
+            png_error(png_ptr, png_ptr->zstream.msg);
+         else
+            png_error(png_ptr, "zlib error");
+      }
+
+      /* See if it is time to write another IDAT */
+      if (!(png_ptr->zstream.avail_out))
+      {
+         /* Write the IDAT and reset the zlib output buffer */
+         png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size);
+         png_ptr->zstream.next_out = png_ptr->zbuf;
+         png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+      }
+   /* Repeat until all data has been compressed */
+   } while (png_ptr->zstream.avail_in);
+
+   /* Swap the current and previous rows */
+   if (png_ptr->prev_row != NULL)
+   {
+      png_bytep tptr;
+
+      tptr = png_ptr->prev_row;
+      png_ptr->prev_row = png_ptr->row_buf;
+      png_ptr->row_buf = tptr;
+   }
+
+   /* Finish row - updates counters and flushes zlib if last row */
+   png_write_finish_row(png_ptr);
+
+#ifdef PNG_WRITE_FLUSH_SUPPORTED
+   png_ptr->flush_rows++;
+
+   if (png_ptr->flush_dist > 0 &&
+       png_ptr->flush_rows >= png_ptr->flush_dist)
+   {
+      png_write_flush(png_ptr);
+   }
+#endif
+}
+#endif /* PNG_WRITE_SUPPORTED */
diff --git a/src/main-loop.cpp b/src/main-loop.cpp
new file mode 100644
index 0000000..2bbd824
--- /dev/null
+++ b/src/main-loop.cpp
@@ -0,0 +1,333 @@
+/*
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis
+ */
+#include "options.h"
+#include "main-loop.h"
+#include "util.h"
+#include "log.h"
+
+#include <string>
+#include <sstream>
+
+/************
+ * MainLoop *
+ ************/
+
+MainLoop::MainLoop(Canvas &canvas, const std::vector<Benchmark *> &benchmarks) :
+    canvas_(canvas), benchmarks_(benchmarks)
+{
+    reset();
+}
+
+
+void
+MainLoop::reset()
+{
+    scene_ = 0;
+    scene_setup_status_ = SceneSetupStatusUnknown;
+    score_ = 0;
+    benchmarks_run_ = 0;
+    bench_iter_ = benchmarks_.begin();
+}
+
+unsigned int
+MainLoop::score()
+{
+    if (benchmarks_run_)
+        return score_ / benchmarks_run_;
+    else
+        return score_;
+}
+
+bool
+MainLoop::step()
+{
+    /* Find the next normal scene */
+    if (!scene_) {
+        /* Find a normal scene */
+        while (bench_iter_ != benchmarks_.end()) {
+            scene_ = &(*bench_iter_)->scene();
+
+            /* 
+             * Scenes with empty names are option-setting scenes.
+             * Just set them up and continue with the search.
+             */
+            if (scene_->name().empty())
+                (*bench_iter_)->setup_scene();
+            else
+                break;
+
+            next_benchmark();
+        }
+
+        /* If we have found a valid scene, set it up */
+        if (bench_iter_ != benchmarks_.end()) {
+            if (!Options::reuse_context)
+                canvas_.reset();
+            before_scene_setup();
+            scene_ = &(*bench_iter_)->setup_scene();
+            if (!scene_->running()) {
+                if (!scene_->supported(false))
+                    scene_setup_status_ = SceneSetupStatusUnsupported;
+                else
+                    scene_setup_status_ = SceneSetupStatusFailure;
+            }
+            else {
+                scene_setup_status_ = SceneSetupStatusSuccess;
+            }
+            after_scene_setup();
+            log_scene_info();
+        }
+        else {
+            /* ... otherwise we are done */
+            return false;
+        }
+    }
+
+    bool should_quit = canvas_.should_quit();
+
+    if (scene_ ->running() && !should_quit)
+        draw();
+
+    /*
+     * Need to recheck whether the scene is still running, because code
+     * in draw() may have changed the state.
+     */
+    if (!scene_->running() || should_quit) {
+        if (scene_setup_status_ == SceneSetupStatusSuccess) {
+            score_ += scene_->average_fps();
+            benchmarks_run_++;
+        }
+        log_scene_result();
+        (*bench_iter_)->teardown_scene();
+        scene_ = 0;
+        next_benchmark();
+    }
+
+    return !should_quit;
+}
+
+void
+MainLoop::draw()
+{
+    canvas_.clear();
+
+    scene_->draw();
+    scene_->update();
+
+    canvas_.update();
+}
+
+void
+MainLoop::log_scene_info()
+{
+    Log::info("%s", scene_->info_string().c_str());
+    Log::flush();
+}
+
+void
+MainLoop::log_scene_result()
+{
+    static const std::string format_fps(Log::continuation_prefix +
+                                        " FPS: %u FrameTime: %.3f ms\n");
+    static const std::string format_unsupported(Log::continuation_prefix +
+                                                " Unsupported\n");
+    static const std::string format_fail(Log::continuation_prefix +
+                                         " Set up failed\n");
+
+    if (scene_setup_status_ == SceneSetupStatusSuccess) {
+        Log::info(format_fps.c_str(), scene_->average_fps(),
+                                      1000.0 / scene_->average_fps());
+    }
+    else if (scene_setup_status_ == SceneSetupStatusUnsupported) {
+        Log::info(format_unsupported.c_str());
+    }
+    else {
+        Log::info(format_fail.c_str());
+    }
+}
+
+void
+MainLoop::next_benchmark()
+{
+    bench_iter_++;
+    if (bench_iter_ == benchmarks_.end() && Options::run_forever)
+        bench_iter_ = benchmarks_.begin();
+}
+
+/**********************
+ * MainLoopDecoration *
+ **********************/
+
+MainLoopDecoration::MainLoopDecoration(Canvas &canvas, const std::vector<Benchmark *> &benchmarks) :
+    MainLoop(canvas, benchmarks), show_fps_(false), show_title_(false),
+    fps_renderer_(0), title_renderer_(0), last_fps_(0)
+{
+
+}
+
+MainLoopDecoration::~MainLoopDecoration()
+{
+    delete fps_renderer_;
+    fps_renderer_ = 0;
+    delete title_renderer_;
+    title_renderer_ = 0;
+}
+
+void
+MainLoopDecoration::draw()
+{
+    static const unsigned int fps_interval = 500000;
+
+    canvas_.clear();
+
+    scene_->draw();
+    scene_->update();
+
+    if (show_fps_) {
+        uint64_t now = Util::get_timestamp_us();
+        if (now - fps_timestamp_ >= fps_interval) {
+            last_fps_ = scene_->average_fps();
+            fps_renderer_update_text(last_fps_);
+            fps_timestamp_ = now;
+        }
+        fps_renderer_->render();
+    }
+
+    if (show_title_)
+        title_renderer_->render();
+
+    canvas_.update();
+}
+
+void
+MainLoopDecoration::before_scene_setup()
+{
+    delete fps_renderer_;
+    fps_renderer_ = 0;
+    delete title_renderer_;
+    title_renderer_ = 0;
+}
+
+void
+MainLoopDecoration::after_scene_setup()
+{
+    const Scene::Option &show_fps_option(scene_->options().find("show-fps")->second);
+    const Scene::Option &title_option(scene_->options().find("title")->second);
+    show_fps_ = show_fps_option.value == "true";
+    show_title_ = !title_option.value.empty();
+
+    if (show_fps_) {
+        const Scene::Option &fps_pos_option(scene_->options().find("fps-pos")->second);
+        const Scene::Option &fps_size_option(scene_->options().find("fps-size")->second);
+        fps_renderer_ = new TextRenderer(canvas_);
+        fps_renderer_->position(vec2_from_pos_string(fps_pos_option.value));
+        fps_renderer_->size(Util::fromString<float>(fps_size_option.value));
+        fps_renderer_update_text(last_fps_);
+        fps_timestamp_ = Util::get_timestamp_us();
+    }
+
+    if (show_title_) {
+        const Scene::Option &title_pos_option(scene_->options().find("title-pos")->second);
+        const Scene::Option &title_size_option(scene_->options().find("title-size")->second);
+        title_renderer_ = new TextRenderer(canvas_);
+        title_renderer_->position(vec2_from_pos_string(title_pos_option.value));
+        title_renderer_->size(Util::fromString<float>(title_size_option.value));
+
+        if (title_option.value == "#info#")
+            title_renderer_->text(scene_->info_string());
+        else if (title_option.value == "#name#")
+            title_renderer_->text(scene_->name());
+        else if (title_option.value == "#r2d2#")
+            title_renderer_->text("Help me, Obi-Wan Kenobi. You're my only hope.");
+        else
+            title_renderer_->text(title_option.value);
+    }
+}
+
+void
+MainLoopDecoration::fps_renderer_update_text(unsigned int fps)
+{
+    std::stringstream ss;
+    ss << "FPS: " << fps;
+    fps_renderer_->text(ss.str());
+}
+
+LibMatrix::vec2
+MainLoopDecoration::vec2_from_pos_string(const std::string &s)
+{
+    LibMatrix::vec2 v(0.0, 0.0);
+    std::vector<std::string> elems;
+    Util::split(s, ',', elems, Util::SplitModeNormal);
+
+    if (elems.size() > 0)
+        v.x(Util::fromString<float>(elems[0]));
+
+    if (elems.size() > 1)
+        v.y(Util::fromString<float>(elems[1]));
+
+    return v;
+}
+
+/**********************
+ * MainLoopValidation *
+ **********************/
+
+MainLoopValidation::MainLoopValidation(Canvas &canvas, const std::vector<Benchmark *> &benchmarks) :
+        MainLoop(canvas, benchmarks)
+{
+}
+
+void
+MainLoopValidation::draw()
+{
+    /* Draw only the first frame of the scene and stop */
+    canvas_.clear();
+
+    scene_->draw();
+
+    canvas_.update();
+
+    scene_->running(false);
+}
+
+void
+MainLoopValidation::log_scene_result()
+{
+    static const std::string format(Log::continuation_prefix + " Validation: %s\n");
+    std::string result;
+
+    switch(scene_->validate()) {
+        case Scene::ValidationSuccess:
+            result = "Success";
+            break;
+        case Scene::ValidationFailure:
+            result = "Failure";
+            break;
+        case Scene::ValidationUnknown:
+            result = "Unknown";
+            break;
+        default:
+            break;
+    }
+
+    Log::info(format.c_str(), result.c_str());
+}
diff --git a/src/main-loop.h b/src/main-loop.h
new file mode 100644
index 0000000..918681e
--- /dev/null
+++ b/src/main-loop.h
@@ -0,0 +1,141 @@
+/*
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis
+ */
+#ifndef GLMARK2_MAIN_LOOP_H_
+#define GLMARK2_MAIN_LOOP_H_
+
+#include "canvas.h"
+#include "benchmark.h"
+#include "text-renderer.h"
+#include "vec.h"
+#include <vector>
+
+/**
+ * Main loop for benchmarking.
+ */
+class MainLoop
+{
+public:
+    MainLoop(Canvas &canvas, const std::vector<Benchmark *> &benchmarks);
+
+    virtual ~MainLoop() {}
+
+    /**
+     * Resets the main loop.
+     *
+     * You need to call reset() if the loop has finished and
+     * you need to run it again.
+     */
+    void reset();
+
+    /**
+     * Gets the current total benchmarking score.
+     */
+    unsigned int score();
+
+    /**
+     * Perform the next main loop step.
+     *
+     * @returns whether the loop has finished
+     */
+    bool step();
+
+    /**
+     * Overridable method for drawing the canvas contents.
+     */
+    virtual void draw();
+
+    /**
+     * Overridable method for pre scene-setup customizations.
+     */
+    virtual void before_scene_setup() {}
+
+    /**
+     * Overridable method for post scene-setup customizations.
+     */
+    virtual void after_scene_setup() {}
+
+    /**
+     * Overridable method for logging scene info.
+     */
+    virtual void log_scene_info();
+
+    /**
+     * Overridable method for logging scene result.
+     */
+    virtual void log_scene_result();
+
+protected:
+    enum SceneSetupStatus {
+        SceneSetupStatusUnknown,
+        SceneSetupStatusSuccess,
+        SceneSetupStatusFailure,
+        SceneSetupStatusUnsupported
+    };
+    void next_benchmark();
+    Canvas &canvas_;
+    Scene *scene_;
+    const std::vector<Benchmark *> &benchmarks_;
+    unsigned int score_;
+    unsigned int benchmarks_run_;
+    SceneSetupStatus scene_setup_status_;
+
+    std::vector<Benchmark *>::const_iterator bench_iter_;
+};
+
+/**
+ * Main loop for benchmarking with decorations (eg FPS, demo)
+ */
+class MainLoopDecoration : public MainLoop
+{
+public:
+    MainLoopDecoration(Canvas &canvas, const std::vector<Benchmark *> &benchmarks);
+    virtual ~MainLoopDecoration();
+
+    virtual void draw();
+    virtual void before_scene_setup();
+    virtual void after_scene_setup();
+
+protected:
+    void fps_renderer_update_text(unsigned int fps);
+    LibMatrix::vec2 vec2_from_pos_string(const std::string &s);
+
+    bool show_fps_;
+    bool show_title_;
+    TextRenderer *fps_renderer_;
+    TextRenderer *title_renderer_;
+    unsigned int last_fps_;
+    uint64_t fps_timestamp_;
+};
+
+/**
+ * Main loop for validation.
+ */
+class MainLoopValidation : public MainLoop
+{
+public:
+    MainLoopValidation(Canvas &canvas, const std::vector<Benchmark *> &benchmarks);
+
+    virtual void draw();
+    virtual void log_scene_result();
+};
+
+#endif /* GLMARK2_MAIN_LOOP_H_ */
diff --git a/src/main.cpp b/src/main.cpp
new file mode 100644
index 0000000..4402a64
--- /dev/null
+++ b/src/main.cpp
@@ -0,0 +1,228 @@
+/*
+ * Copyright © 2008 Ben Smith
+ * Copyright © 2010-2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Ben Smith (original glmark benchmark)
+ *  Alexandros Frantzis (glmark2)
+ *  Jesse Barker (glmark2)
+ */
+#include "gl-headers.h"
+#include "scene.h"
+#include "benchmark.h"
+#include "options.h"
+#include "log.h"
+#include "util.h"
+#include "text-renderer.h"
+#include "main-loop.h"
+#include "benchmark-collection.h"
+
+#include <iostream>
+#include <fstream>
+
+#if USE_DRM
+#include "canvas-drm.h"
+#elif USE_GL
+#include "canvas-x11-glx.h"
+#elif USE_GLESv2
+#include "canvas-x11-egl.h"
+#endif
+
+using std::vector;
+using std::map;
+using std::string;
+
+void
+add_and_register_scenes(vector<Scene*>& scenes, Canvas& canvas)
+{
+    scenes.push_back(new SceneDefaultOptions(canvas));
+    scenes.push_back(new SceneBuild(canvas));
+    scenes.push_back(new SceneTexture(canvas));
+    scenes.push_back(new SceneShading(canvas));
+    scenes.push_back(new SceneConditionals(canvas));
+    scenes.push_back(new SceneFunction(canvas));
+    scenes.push_back(new SceneLoop(canvas));
+    scenes.push_back(new SceneBump(canvas));
+    scenes.push_back(new SceneEffect2D(canvas));
+    scenes.push_back(new ScenePulsar(canvas));
+    scenes.push_back(new SceneDesktop(canvas));
+    scenes.push_back(new SceneBuffer(canvas));
+    scenes.push_back(new SceneIdeas(canvas));
+    scenes.push_back(new SceneTerrain(canvas));
+    scenes.push_back(new SceneJellyfish(canvas));
+    scenes.push_back(new SceneShadow(canvas));
+    scenes.push_back(new SceneRefract(canvas));
+
+    for (vector<Scene*>::const_iterator iter = scenes.begin();
+         iter != scenes.end();
+         iter++)
+    {
+        Benchmark::register_scene(**iter);
+    }
+}
+
+static void
+list_scenes()
+{
+    const map<string, Scene *> &scenes = Benchmark::scenes();
+
+    for (map<string, Scene *>::const_iterator scene_iter = scenes.begin();
+         scene_iter != scenes.end();
+         scene_iter++)
+    {
+        Scene *scene = scene_iter->second;
+        if (scene->name().empty())
+            continue;
+        Log::info("[Scene] %s\n", scene->name().c_str());
+
+        const map<string, Scene::Option> &options = scene->options();
+
+        for (map<string, Scene::Option>::const_iterator opt_iter = options.begin();
+             opt_iter != options.end();
+             opt_iter++)
+        {
+            const Scene::Option &opt = opt_iter->second;
+            Log::info("  [Option] %s\n"
+                      "    Description  : %s\n"
+                      "    Default Value: %s\n",
+                      opt.name.c_str(),
+                      opt.description.c_str(),
+                      opt.default_value.c_str());
+
+            /* Display list of acceptable values (if defined) */
+            if (!opt.acceptable_values.empty()) {
+                Log::info("    Acceptable Values: ");
+                for (vector<string>::const_iterator val_iter = opt.acceptable_values.begin();
+                     val_iter != opt.acceptable_values.end();
+                     val_iter++)
+                {
+                    std::string format_value(Log::continuation_prefix + "%s");
+                    if (val_iter + 1 != opt.acceptable_values.end())
+                        format_value += ",";
+                    else
+                        format_value += "\n";
+                    Log::info(format_value.c_str(), val_iter->c_str());
+                }
+            }
+        }
+    }
+}
+
+void
+do_benchmark(Canvas &canvas)
+{
+    BenchmarkCollection benchmark_collection;
+    MainLoop *loop;
+
+    benchmark_collection.populate_from_options();
+    
+    if (benchmark_collection.needs_decoration())
+        loop = new MainLoopDecoration(canvas, benchmark_collection.benchmarks());
+    else
+        loop = new MainLoop(canvas, benchmark_collection.benchmarks());
+
+    while (loop->step());
+
+    Log::info("=======================================================\n");
+    Log::info("                                  glmark2 Score: %u \n", loop->score());
+    Log::info("=======================================================\n");
+
+    delete loop;
+}
+
+void
+do_validation(Canvas &canvas)
+{
+    BenchmarkCollection benchmark_collection;
+
+    benchmark_collection.populate_from_options();
+
+    MainLoopValidation loop(canvas, benchmark_collection.benchmarks());
+
+    while (loop.step());
+}
+
+int
+main(int argc, char *argv[])
+{
+
+    if (!Options::parse_args(argc, argv))
+        return 1;
+
+    /* Initialize Log class */
+    Log::init(Util::appname_from_path(argv[0]), Options::show_debug);
+
+    if (Options::show_help) {
+        Options::print_help();
+        return 0;
+    }
+
+    /* Force 800x600 output for validation */
+    if (Options::validate &&
+        Options::size != std::pair<int,int>(800, 600))
+    {
+        Log::info("Ignoring custom size %dx%d for validation. Using 800x600.\n",
+                  Options::size.first, Options::size.second);
+        Options::size = std::pair<int,int>(800, 600);
+    }
+
+    // Create the canvas
+#if USE_DRM
+    CanvasDRM canvas(Options::size.first, Options::size.second);
+#elif USE_GL
+    CanvasX11GLX canvas(Options::size.first, Options::size.second);
+#elif USE_GLESv2
+    CanvasX11EGL canvas(Options::size.first, Options::size.second);
+#endif
+
+    canvas.offscreen(Options::offscreen);
+
+    canvas.visual_config(Options::visual_config);
+
+    vector<Scene*> scenes;
+
+    // Register the scenes, so they can be looked up by name
+    add_and_register_scenes(scenes, canvas);
+
+    if (Options::list_scenes) {
+        list_scenes();
+        return 0;
+    }
+
+    if (!canvas.init()) {
+        Log::error("%s: Could not initialize canvas\n", __FUNCTION__);
+        return 1;
+    }
+
+    Log::info("=======================================================\n");
+    Log::info("    glmark2 %s\n", GLMARK_VERSION);
+    Log::info("=======================================================\n");
+    canvas.print_info();
+    Log::info("=======================================================\n");
+
+    canvas.visible(true);
+
+    if (Options::validate)
+        do_validation(canvas);
+    else
+        do_benchmark(canvas);
+
+    Util::dispose_pointer_vector(scenes);
+
+    return 0;
+}
diff --git a/src/mesh.cpp b/src/mesh.cpp
new file mode 100644
index 0000000..9ccbcc6
--- /dev/null
+++ b/src/mesh.cpp
@@ -0,0 +1,639 @@
+/*
+ * Copyright © 2008 Ben Smith
+ * Copyright © 2010-2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Ben Smith (original glmark benchmark)
+ *  Alexandros Frantzis (glmark2)
+ */
+#include "mesh.h"
+#include "log.h"
+#include "gl-headers.h"
+
+
+Mesh::Mesh() :
+    vertex_size_(0), interleave_(false), vbo_update_method_(VBOUpdateMethodMap),
+    vbo_usage_(VBOUsageStatic)
+{
+}
+
+Mesh::~Mesh()
+{
+    reset();
+}
+
+/*
+ * Sets the vertex format for this mesh.
+ *
+ * The format consists of a vector of integers, each
+ * specifying the size in floats of each vertex attribute.
+ *
+ * e.g. {4, 3, 2} => 3 attributes vec4, vec3, vec2
+ */
+void
+Mesh::set_vertex_format(const std::vector<int> &format)
+{
+    int pos = 0;
+    vertex_format_.clear();
+
+    for (std::vector<int>::const_iterator iter = format.begin();
+         iter != format.end();
+         iter++)
+    {
+        int n = *iter;
+        vertex_format_.push_back(std::pair<int,int>(n, pos));
+
+        pos += n;
+    }
+
+    vertex_size_ = pos;
+}
+
+/*
+ * Sets the attribute locations.
+ *
+ * These are the locations used in glEnableVertexAttribArray()
+ * and other related functions.
+ */
+void
+Mesh::set_attrib_locations(const std::vector<int> &locations)
+{
+    if (locations.size() != vertex_format_.size())
+        Log::error("Trying to set attribute locations using wrong size\n");
+    attrib_locations_ = locations;
+}
+
+
+/**
+ * Checks that an attribute is of the correct dimensionality.
+ *
+ * @param pos the position/index of the attribute to check
+ * @param dim the size of the attribute (in #floats)
+ *
+ * @return whether the check succeeded
+ */
+bool
+Mesh::check_attrib(unsigned int pos, int dim)
+{
+    if (pos > vertex_format_.size()) {
+        Log::error("Trying to set non-existent attribute\n");
+        return false;
+    }
+
+    if (vertex_format_[pos].first != dim) {
+        Log::error("Trying to set attribute with value of invalid type\n");
+        return false;
+    }
+
+    return true;
+}
+
+
+/**
+ * Ensures that we have a vertex to process.
+ *
+ * @return the vertex to process
+ */
+std::vector<float> &
+Mesh::ensure_vertex()
+{
+    if (vertices_.empty())
+        next_vertex();
+
+    return vertices_.back();
+}
+
+/*
+ * Sets the value of an attribute in the current vertex.
+ *
+ * The pos parameter refers to the position of the attribute
+ * as specified indirectly when setting the format using
+ * set_vertex_format(). e.g. 0 = first attribute, 1 = second
+ * etc
+ */
+void
+Mesh::set_attrib(unsigned int pos, const LibMatrix::vec2 &v, std::vector<float> *vertex)
+{
+    if (!check_attrib(pos, 2))
+        return;
+
+    std::vector<float> &vtx = !vertex ? ensure_vertex() : *vertex;
+
+    int offset = vertex_format_[pos].second;
+
+    vtx[offset] = v.x();
+    vtx[offset + 1] = v.y();
+}
+
+void
+Mesh::set_attrib(unsigned int pos, const LibMatrix::vec3 &v, std::vector<float> *vertex)
+{
+    if (!check_attrib(pos, 3))
+        return;
+
+    std::vector<float> &vtx = !vertex ? ensure_vertex() : *vertex;
+
+    int offset = vertex_format_[pos].second;
+
+    vtx[offset] = v.x();
+    vtx[offset + 1] = v.y();
+    vtx[offset + 2] = v.z();
+}
+
+void
+Mesh::set_attrib(unsigned int pos, const LibMatrix::vec4 &v, std::vector<float> *vertex)
+{
+    if (!check_attrib(pos, 4))
+        return;
+
+    std::vector<float> &vtx = !vertex ? ensure_vertex() : *vertex;
+
+    int offset = vertex_format_[pos].second;
+
+    vtx[offset] = v.x();
+    vtx[offset + 1] = v.y();
+    vtx[offset + 2] = v.z();
+    vtx[offset + 3] = v.w();
+}
+
+/*
+ * Adds a new vertex to the list and makes it current.
+ */
+void
+Mesh::next_vertex()
+{
+    vertices_.push_back(std::vector<float>(vertex_size_));
+}
+
+/**
+ * Gets the mesh vertices.
+ *
+ * You should use the ::set_attrib() method to manipulate
+ * the vertex data.
+ *
+ * You shouldn't resize the vector (change the number of vertices)
+ * manually. Use ::next_vertex() instead.
+ */
+std::vector<std::vector<float> >&
+Mesh::vertices()
+{
+    return vertices_;
+}
+
+/**
+ * Sets the VBO update method.
+ *
+ * The default value is VBOUpdateMethodMap.
+ */
+void
+Mesh::vbo_update_method(Mesh::VBOUpdateMethod method)
+{
+    vbo_update_method_ = method;
+}
+
+/**
+ * Sets the VBO usage hint.
+ *
+ * The usage hint takes effect in the next call to ::build_vbo().
+ *
+ * The default value is VBOUsageStatic.
+ */
+void
+Mesh::vbo_usage(Mesh::VBOUsage usage)
+{
+    vbo_usage_ = usage;
+}
+
+/**
+ * Sets the vertex attribute interleaving mode.
+ *
+ * If true the vertex attributes are going to be interleaved in a single
+ * buffer. Otherwise they will be separated into different buffers (one
+ * per attribute).
+ *
+ * Interleaving mode takes effect in the next call to ::build_array() or
+ * ::build_vbo().
+ *
+ * @param interleave whether to interleave
+ */
+void
+Mesh::interleave(bool interleave)
+{
+    interleave_ = interleave;
+}
+
+/**
+ * Resets a Mesh object to its initial, empty state.
+ */
+void
+Mesh::reset()
+{
+    delete_array();
+    delete_vbo();
+
+    vertices_.clear();
+    vertex_format_.clear();
+    attrib_locations_.clear();
+    attrib_data_ptr_.clear();
+    vertex_size_ = 0;
+    vertex_stride_ = 0;
+}
+
+/**
+ * Builds a vertex array containing the mesh vertex data.
+ *
+ * The way the vertex array is constructed is affected by the current
+ * interleave value, which can set using ::interleave().
+ */
+void
+Mesh::build_array()
+{
+    int nvertices = vertices_.size();
+
+    if (!interleave_) {
+        /* Create an array for each attribute */
+        for (std::vector<std::pair<int, int> >::const_iterator ai = vertex_format_.begin();
+             ai != vertex_format_.end();
+             ai++)
+        {
+            float *array = new float[nvertices * ai->first];
+            float *cur = array;
+
+            /* Fill in the array */
+            for (std::vector<std::vector<float> >::const_iterator vi = vertices_.begin();
+                    vi != vertices_.end();
+                    vi++)
+            {
+                for (int i = 0; i < ai->first; i++)
+                    *cur++ = (*vi)[ai->second + i];
+            }
+
+            vertex_arrays_.push_back(array);
+            attrib_data_ptr_.push_back(array);
+        }
+        vertex_stride_ = 0;
+    }
+    else {
+        float *array = new float[nvertices * vertex_size_];
+        float *cur = array;
+
+        for (std::vector<std::vector<float> >::const_iterator vi = vertices_.begin();
+             vi != vertices_.end();
+             vi++)
+        {
+            /* Fill in the array */
+            for (int i = 0; i < vertex_size_; i++)
+                *cur++ = (*vi)[i];
+        }
+
+        for (size_t i = 0; i < vertex_format_.size(); i++)
+            attrib_data_ptr_.push_back(array + vertex_format_[i].second);
+
+        vertex_arrays_.push_back(array);
+        vertex_stride_ = vertex_size_ * sizeof(float);
+    }
+}
+
+/**
+ * Builds a vertex buffer object containing the mesh vertex data.
+ *
+ * The way the VBO is constructed is affected by the current interleave
+ * value (::interleave()) and the vbo usage hint (::vbo_usage()).
+ */
+void
+Mesh::build_vbo()
+{
+    delete_array();
+    build_array();
+
+    int nvertices = vertices_.size();
+
+    attrib_data_ptr_.clear();
+
+    GLenum buffer_usage;
+    if (vbo_usage_ == Mesh::VBOUsageStream)
+        buffer_usage = GL_STREAM_DRAW;
+    else if (vbo_usage_ == Mesh::VBOUsageDynamic)
+        buffer_usage = GL_DYNAMIC_DRAW;
+    else /* if (vbo_usage_ == Mesh::VBOUsageStatic) */
+        buffer_usage = GL_STATIC_DRAW;
+
+    if (!interleave_) {
+        /* Create a vbo for each attribute */
+        for (std::vector<std::pair<int, int> >::const_iterator ai = vertex_format_.begin();
+             ai != vertex_format_.end();
+             ai++)
+        {
+            float *data = vertex_arrays_[ai - vertex_format_.begin()];
+            GLuint vbo;
+
+            glGenBuffers(1, &vbo);
+            glBindBuffer(GL_ARRAY_BUFFER, vbo);
+            glBufferData(GL_ARRAY_BUFFER, nvertices * ai->first * sizeof(float),
+                         data, buffer_usage);
+
+            vbos_.push_back(vbo);
+            attrib_data_ptr_.push_back(0);
+        }
+
+        vertex_stride_ = 0;
+    }
+    else {
+        GLuint vbo;
+        /* Create a single vbo to store all attribute data */
+        glGenBuffers(1, &vbo);
+        glBindBuffer(GL_ARRAY_BUFFER, vbo);
+
+        glBufferData(GL_ARRAY_BUFFER, nvertices * vertex_size_ * sizeof(float),
+                     vertex_arrays_[0], GL_STATIC_DRAW);
+
+        glBindBuffer(GL_ARRAY_BUFFER, 0);
+
+        for (size_t i = 0; i < vertex_format_.size(); i++) {
+            attrib_data_ptr_.push_back(reinterpret_cast<float *>(sizeof(float) * vertex_format_[i].second));
+            vbos_.push_back(vbo);
+        }
+        vertex_stride_ = vertex_size_ * sizeof(float);
+    }
+
+    delete_array();
+}
+
+/**
+ * Updates ranges of a single vertex array.
+ *
+ * @param ranges the ranges of vertices to update
+ * @param n the index of the vertex array to update
+ * @param nfloats how many floats to update for each vertex
+ * @param offset the offset (in floats) in the vertex data to start reading from
+ */
+void
+Mesh::update_single_array(const std::vector<std::pair<size_t, size_t> >& ranges,
+                          size_t n, size_t nfloats, size_t offset)
+{
+    float *array(vertex_arrays_[n]);
+
+    /* Update supplied ranges */
+    for (std::vector<std::pair<size_t, size_t> >::const_iterator ri = ranges.begin();
+         ri != ranges.end();
+         ri++)
+    {
+        /* Update the current range from the vertex data */
+        float *dest(array + nfloats * ri->first);
+        for (size_t n = ri->first; n <= ri->second; n++) {
+            for (size_t i = 0; i < nfloats; i++)
+                *dest++ = vertices_[n][offset + i];
+        }
+
+    }
+}
+
+/**
+ * Updates ranges of the vertex arrays.
+ *
+ * @param ranges the ranges of vertices to update
+ */
+void
+Mesh::update_array(const std::vector<std::pair<size_t, size_t> >& ranges)
+{
+    /* If we don't have arrays to update, create them */
+    if (vertex_arrays_.empty()) {
+        build_array();
+        return;
+    }
+
+    if (!interleave_) {
+        for (size_t i = 0; i < vertex_arrays_.size(); i++) {
+            update_single_array(ranges, i, vertex_format_[i].first,
+                                vertex_format_[i].second);
+        }
+    }
+    else {
+        update_single_array(ranges, 0, vertex_size_, 0);
+    }
+
+}
+
+
+/**
+ * Updates ranges of a single VBO.
+ *
+ * This method use either glMapBuffer or glBufferSubData to perform
+ * the update. The used method can be set with ::vbo_update_method().
+ *
+ * @param ranges the ranges of vertices to update
+ * @param n the index of the vbo to update
+ * @param nfloats how many floats to update for each vertex
+ */
+void
+Mesh::update_single_vbo(const std::vector<std::pair<size_t, size_t> >& ranges,
+                        size_t n, size_t nfloats)
+{
+    float *src_start(vertex_arrays_[n]);
+    float *dest_start(0);
+
+    glBindBuffer(GL_ARRAY_BUFFER, vbos_[n]);
+
+    if (vbo_update_method_ == VBOUpdateMethodMap) {
+        dest_start = reinterpret_cast<float *>(
+                GLExtensions::MapBuffer(GL_ARRAY_BUFFER, GL_WRITE_ONLY)
+                );
+    }
+
+    /* Update supplied ranges */
+    for (std::vector<std::pair<size_t, size_t> >::const_iterator iter = ranges.begin();
+         iter != ranges.end();
+         iter++)
+    {
+        float *src(src_start + nfloats * iter->first);
+        float *src_end(src_start + nfloats * (iter->second + 1));
+
+        if (vbo_update_method_ == VBOUpdateMethodMap) {
+            float *dest(dest_start + nfloats * iter->first);
+            std::copy(src, src_end, dest);
+        }
+        else if (vbo_update_method_ == VBOUpdateMethodSubData) {
+            glBufferSubData(GL_ARRAY_BUFFER, nfloats * iter->first * sizeof(float),
+                            (src_end - src) * sizeof(float), src);
+        }
+    }
+
+    if (vbo_update_method_ == VBOUpdateMethodMap)
+        GLExtensions::UnmapBuffer(GL_ARRAY_BUFFER);
+}
+
+/**
+ * Updates ranges of the VBOs.
+ *
+ * @param ranges the ranges of vertices to update
+ */
+void
+Mesh::update_vbo(const std::vector<std::pair<size_t, size_t> >& ranges)
+{
+    /* If we don't have VBOs to update, create them */
+    if (vbos_.empty()) {
+        build_vbo();
+        return;
+    }
+
+    update_array(ranges);
+
+    if (!interleave_) {
+        for (size_t i = 0; i < vbos_.size(); i++)
+            update_single_vbo(ranges, i, vertex_format_[i].first);
+    }
+    else {
+        update_single_vbo(ranges, 0, vertex_size_);
+    }
+
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+}
+
+
+/**
+ * Deletes all resources associated with built vertex arrays.
+ */
+void
+Mesh::delete_array()
+{
+    for (size_t i = 0; i < vertex_arrays_.size(); i++) {
+        delete [] vertex_arrays_[i];
+    }
+
+    vertex_arrays_.clear();
+}
+
+/**
+ * Deletes all resources associated with built VBOs.
+ */
+void
+Mesh::delete_vbo()
+{
+    for (size_t i = 0; i < vbos_.size(); i++) {
+        GLuint vbo = vbos_[i];
+        glDeleteBuffers(1, &vbo);
+    }
+
+    vbos_.clear();
+}
+
+
+/**
+ * Renders a mesh using vertex arrays.
+ *
+ * The vertex arrays must have been previously initialized using
+ * ::build_array().
+ */
+void
+Mesh::render_array()
+{
+    for (size_t i = 0; i < vertex_format_.size(); i++) {
+        if (attrib_locations_[i] < 0)
+            continue;
+        glEnableVertexAttribArray(attrib_locations_[i]);
+        glVertexAttribPointer(attrib_locations_[i], vertex_format_[i].first,
+                              GL_FLOAT, GL_FALSE, vertex_stride_,
+                              attrib_data_ptr_[i]);
+    }
+
+    glDrawArrays(GL_TRIANGLES, 0, vertices_.size());
+
+    for (size_t i = 0; i < vertex_format_.size(); i++) {
+        if (attrib_locations_[i] < 0)
+            continue;
+        glDisableVertexAttribArray(attrib_locations_[i]);
+    }
+}
+
+/**
+ * Renders a mesh using vertex buffer objects.
+ *
+ * The vertex buffer objects must have been previously initialized using
+ * ::build_vbo().
+ */
+void
+Mesh::render_vbo()
+{
+    for (size_t i = 0; i < vertex_format_.size(); i++) {
+        if (attrib_locations_[i] < 0)
+            continue;
+        glEnableVertexAttribArray(attrib_locations_[i]);
+        glBindBuffer(GL_ARRAY_BUFFER, vbos_[i]);
+        glVertexAttribPointer(attrib_locations_[i], vertex_format_[i].first,
+                              GL_FLOAT, GL_FALSE, vertex_stride_,
+                              attrib_data_ptr_[i]);
+    }
+
+    glDrawArrays(GL_TRIANGLES, 0, vertices_.size());
+
+    for (size_t i = 0; i < vertex_format_.size(); i++) {
+        if (attrib_locations_[i] < 0)
+            continue;
+        glDisableVertexAttribArray(attrib_locations_[i]);
+    }
+}
+
+/**
+ * Creates a grid mesh.
+ *
+ * @param n_x the number of grid cells on the X axis
+ * @param n_y the number of grid cells on the Y axis
+ * @param width the width X of the grid (normalized)
+ * @param height the height Y of the grid (normalized)
+ * @param spacing the spacing between cells (normalized)
+ * @param conf_func a function to call to configure the grid (or NULL)
+ */
+void
+Mesh::make_grid(int n_x, int n_y, double width, double height,
+                double spacing, grid_configuration_func conf_func)
+{
+    double side_width = (width - (n_x - 1) * spacing) / n_x;
+    double side_height = (height - (n_y - 1) * spacing) / n_y;
+
+    for (int i = 0; i < n_x; i++) {
+        for (int j = 0; j < n_y; j++) {
+            LibMatrix::vec3 a(-width / 2 + i * (side_width + spacing),
+                              height / 2 - j * (side_height + spacing), 0);
+            LibMatrix::vec3 b(a.x(), a.y() - side_height, 0);
+            LibMatrix::vec3 c(a.x() + side_width, a.y(), 0);
+            LibMatrix::vec3 d(a.x() + side_width, a.y() - side_height, 0);
+
+            if (!conf_func) {
+                std::vector<float> ul(vertex_size_);
+                std::vector<float> ur(vertex_size_);
+                std::vector<float> ll(vertex_size_);
+                std::vector<float> lr(vertex_size_);
+
+                set_attrib(0, a, &ul);
+                set_attrib(0, c, &ur);
+                set_attrib(0, b, &ll);
+                set_attrib(0, d, &lr);
+
+                next_vertex(); vertices_.back() = ul;
+                next_vertex(); vertices_.back() = ll;
+                next_vertex(); vertices_.back() = ur;
+                next_vertex(); vertices_.back() = ll;
+                next_vertex(); vertices_.back() = lr;
+                next_vertex(); vertices_.back() = ur;
+            }
+            else {
+                conf_func(*this, i, j, n_x, n_y, a, b, c, d);
+            }
+        }
+    }
+}
diff --git a/src/mesh.h b/src/mesh.h
new file mode 100644
index 0000000..99630f2
--- /dev/null
+++ b/src/mesh.h
@@ -0,0 +1,117 @@
+/*
+ * Copyright © 2008 Ben Smith
+ * Copyright © 2010-2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Ben Smith (original glmark benchmark)
+ *  Alexandros Frantzis (glmark2)
+ *  Jesse Barker (glmark2)
+ */
+#ifndef GLMARK2_MESH_H_
+#define GLMARK2_MESH_H_
+
+#include <vector>
+#include "vec.h"
+#include "gl-headers.h"
+
+/**
+ * A mesh of vertices.
+ */
+class Mesh
+{
+public:
+    Mesh();
+    ~Mesh();
+
+    void set_vertex_format(const std::vector<int> &format);
+    void set_attrib_locations(const std::vector<int> &locations);
+
+    void set_attrib(unsigned int pos, const LibMatrix::vec2 &v, std::vector<float> *vertex = 0);
+    void set_attrib(unsigned int pos, const LibMatrix::vec3 &v, std::vector<float> *vertex = 0);
+    void set_attrib(unsigned int pos, const LibMatrix::vec4 &v, std::vector<float> *vertex = 0);
+    void next_vertex();
+    std::vector<std::vector<float> >& vertices();
+
+    enum VBOUpdateMethod {
+        VBOUpdateMethodMap,
+        VBOUpdateMethodSubData,
+    };
+    enum VBOUsage {
+        VBOUsageStatic,
+        VBOUsageStream,
+        VBOUsageDynamic,
+    };
+
+    void vbo_update_method(VBOUpdateMethod method);
+    void vbo_usage(VBOUsage usage);
+    void interleave(bool interleave);
+
+    void reset();
+    void build_array();
+    void build_vbo();
+    void update_array(const std::vector<std::pair<size_t, size_t> >& ranges);
+    void update_vbo(const std::vector<std::pair<size_t, size_t> >& ranges);
+    void delete_array();
+    void delete_vbo();
+
+    void render_array();
+    void render_vbo();
+
+    typedef void (*grid_configuration_func)(Mesh &mesh, int x, int y, int n_x, int n_y,
+                                            LibMatrix::vec3 &ul,
+                                            LibMatrix::vec3 &ll,
+                                            LibMatrix::vec3 &ur,
+                                            LibMatrix::vec3 &lr);
+
+    void make_grid(int n_x, int n_y, double width, double height,
+                   double spacing, grid_configuration_func conf_func = 0);
+
+private:
+    bool check_attrib(unsigned int pos, int dim);
+    std::vector<float> &ensure_vertex();
+    void update_single_array(const std::vector<std::pair<size_t, size_t> >& ranges,
+                             size_t n, size_t nfloats, size_t offset);
+    void update_single_vbo(const std::vector<std::pair<size_t, size_t> >& ranges,
+                           size_t n, size_t nfloats);
+
+    //
+    // vertex_format_ is a vector of pairs describing the attribute data.
+    // pair.first is the dimension of the attribute (vec2, vec3, vec4) and
+    // pair.second is the number of float values into the vertex data of that
+    // attribute.  So, for example, if there are 3 attributes, a vec3 position
+    // a vec3 normal and a vec2 texture coordinate, you would have a
+    // vertex_format_ with 3 elements as follows: {<3, 0>, <3, 3>, <2, 6>} and
+    // the total size of each vertex would be the sum of the dimensions times
+    // the size of a float, or: 8 * sizeof(float) == 32 bytes
+    //
+    std::vector<std::pair<int, int> > vertex_format_;
+    std::vector<int> attrib_locations_;
+    int vertex_size_;
+
+    std::vector<std::vector<float> > vertices_;
+
+    std::vector<float *> vertex_arrays_;
+    std::vector<GLuint> vbos_;
+    std::vector<float *> attrib_data_ptr_;
+    int vertex_stride_;
+    bool interleave_;
+    VBOUpdateMethod vbo_update_method_;
+    VBOUsage vbo_usage_;
+};
+
+#endif
diff --git a/src/model.cpp b/src/model.cpp
new file mode 100644
index 0000000..720da67
--- /dev/null
+++ b/src/model.cpp
@@ -0,0 +1,807 @@
+/*
+ * Copyright © 2008 Ben Smith
+ * Copyright © 2010-2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Ben Smith (original glmark benchmark)
+ *  Alexandros Frantzis (glmark2)
+ */
+#include "mesh.h"
+#include "model.h"
+#include "vec.h"
+#include "log.h"
+#include "options.h"
+#include "util.h"
+#include "float.h"
+#include "math.h"
+#include <fstream>
+#include <sstream>
+#include <memory>
+
+using std::string;
+using std::vector;
+using LibMatrix::vec3;
+using LibMatrix::uvec3;
+
+#define read_or_fail(file, dst, size) do { \
+    file.read(reinterpret_cast<char *>((dst)), (size)); \
+    if (file.gcount() < (std::streamsize)(size)) { \
+        Log::error("%s: %d: Failed to read %zd bytes from 3ds file (read %zd)\n", \
+                   __FUNCTION__, __LINE__, \
+                   (size_t)(size), file.gcount()); \
+        return false; \
+    } \
+} while(0);
+
+/**
+ * Computes the bounding box for a Model::Object.
+ *
+ * @param object the Model object
+ */
+void
+Model::compute_bounding_box(const Object& object)
+{
+    float minX(FLT_MAX);
+    float maxX(FLT_MIN);
+    float minY(FLT_MAX);
+    float maxY(FLT_MIN);
+    float minZ(FLT_MAX);
+    float maxZ(FLT_MIN);
+    for (vector<Vertex>::const_iterator vIt = object.vertices.begin(); vIt != object.vertices.end(); vIt++)
+    {
+        const vec3& curVtx = vIt->v;
+        if (curVtx.x() < minX)
+        {
+            minX = curVtx.x();
+        }
+        if (curVtx.x() > maxX)
+        {
+            maxX = curVtx.x();
+        }
+        if (curVtx.y() < minY)
+        {
+            minY = curVtx.y();
+        }
+        if (curVtx.y() > maxY)
+        {
+            maxY = curVtx.y();
+        }
+        if (curVtx.z() < minZ)
+        {
+            minZ = curVtx.z();
+        }
+        if (curVtx.z() > maxZ)
+        {
+            maxZ = curVtx.z();
+        }
+    }
+    maxVec_ = vec3(maxX, maxY, maxZ);
+    minVec_ = vec3(minX, minY, minZ);
+}
+
+/**
+ * Appends the vertices of a Model::Object to a Mesh.
+ *
+ * @param object the object to append
+ * @param mesh the mesh to append to
+ * @param p_pos the attribute position to use for the 'position' attribute
+ * @param n_pos the attribute position to use for the 'normal' attribute
+ * @param t_pos the attribute position to use for the 'texcoord' attribute
+ */
+void
+Model::append_object_to_mesh(const Object &object, Mesh &mesh,
+                             int p_pos, int n_pos, int t_pos,
+                             int nt_pos, int nb_pos)
+{
+    size_t face_count = object.faces.size();
+
+    for(size_t i = 0; i < 3 * face_count; i += 3)
+    {
+        const Face &face = object.faces[i / 3];
+        const Vertex &a = object.vertices[face.a];
+        const Vertex &b = object.vertices[face.b];
+        const Vertex &c = object.vertices[face.c];
+
+        mesh.next_vertex();
+        if (p_pos >= 0)
+            mesh.set_attrib(p_pos, a.v);
+        if (n_pos >= 0)
+            mesh.set_attrib(n_pos, a.n);
+        if (t_pos >= 0)
+            mesh.set_attrib(t_pos, a.t);
+        if (nt_pos >= 0)
+            mesh.set_attrib(nt_pos, a.nt);
+        if (nb_pos >= 0)
+            mesh.set_attrib(nb_pos, a.nb);
+
+        mesh.next_vertex();
+        if (p_pos >= 0)
+            mesh.set_attrib(p_pos, b.v);
+        if (n_pos >= 0)
+            mesh.set_attrib(n_pos, b.n);
+        if (t_pos >= 0)
+            mesh.set_attrib(t_pos, b.t);
+        if (nt_pos >= 0)
+            mesh.set_attrib(nt_pos, b.nt);
+        if (nb_pos >= 0)
+            mesh.set_attrib(nb_pos, b.nb);
+
+        mesh.next_vertex();
+        if (p_pos >= 0)
+            mesh.set_attrib(p_pos, c.v);
+        if (n_pos >= 0)
+            mesh.set_attrib(n_pos, c.n);
+        if (t_pos >= 0)
+            mesh.set_attrib(t_pos, c.t);
+        if (nt_pos >= 0)
+            mesh.set_attrib(nt_pos, c.nt);
+        if (nb_pos >= 0)
+            mesh.set_attrib(nb_pos, c.nb);
+    }
+}
+
+/**
+ * Converts a model to a mesh using the default attributes bindings.
+ *
+ * The default attributes and their order is: Position, Normal, Texcoord
+ *
+ * @param mesh the mesh to populate
+ */
+void
+Model::convert_to_mesh(Mesh &mesh)
+{
+    std::vector<std::pair<AttribType, int> > attribs;
+
+    attribs.push_back(std::pair<AttribType, int>(AttribTypePosition, 3));
+    attribs.push_back(std::pair<AttribType, int>(AttribTypeNormal, 3));
+    attribs.push_back(std::pair<AttribType, int>(AttribTypeTexcoord, 2));
+
+    convert_to_mesh(mesh, attribs);
+}
+
+/**
+ * Converts a model to a mesh using custom attribute bindings.
+ *
+ * The attribute bindings are pairs of <AttribType, dimensionality>.
+ *
+ * @param mesh the mesh to populate
+ * @param attribs the attribute bindings to use
+ */
+void
+Model::convert_to_mesh(Mesh &mesh,
+                       const std::vector<std::pair<AttribType, int> > &attribs)
+{
+    std::vector<int> format;
+    int p_pos = -1;
+    int n_pos = -1;
+    int t_pos = -1;
+    int nt_pos = -1;
+    int nb_pos = -1;
+
+    mesh.reset();
+
+    for (std::vector<std::pair<AttribType, int> >::const_iterator ai = attribs.begin();
+         ai != attribs.end();
+         ai++)
+    {
+        format.push_back(ai->second);
+        if (ai->first == AttribTypePosition)
+            p_pos = ai - attribs.begin();
+        else if (ai->first == AttribTypeNormal)
+            n_pos = ai - attribs.begin();
+        else if (ai->first == AttribTypeTexcoord)
+            t_pos = ai - attribs.begin();
+        else if (ai->first == AttribTypeTangent)
+            nt_pos = ai - attribs.begin();
+        else if (ai->first == AttribTypeBitangent)
+            nb_pos = ai - attribs.begin();
+    }
+
+    mesh.set_vertex_format(format);
+
+    for (std::vector<Object>::const_iterator iter = objects_.begin();
+         iter != objects_.end();
+         iter++)
+    {
+        append_object_to_mesh(*iter, mesh, p_pos, n_pos, t_pos, nt_pos, nb_pos);
+    }
+}
+
+void
+Model::calculate_texcoords()
+{
+    // Since the model didn't come with texcoords, and we don't actually know
+    // if it came with normals, either, we'll use positional spherical mapping
+    // to generate texcoords for the model.  See:
+    // http://www.mvps.org/directx/articles/spheremap.htm for more details.
+    vec3 centerVec = maxVec_ + minVec_;
+    centerVec *= 0.5;
+    
+    for (std::vector<Object>::iterator iter = objects_.begin();
+         iter != objects_.end();
+         iter++)
+    {
+        Object &object = *iter;
+        for (vector<Vertex>::iterator vertexIt = object.vertices.begin();
+             vertexIt != object.vertices.end();
+             vertexIt++)
+        {
+            Vertex& curVertex = *vertexIt;
+            vec3 vnorm(curVertex.v - centerVec);
+            vnorm.normalize();
+            curVertex.t.x(asinf(vnorm.x()) / M_PI + 0.5);
+            curVertex.t.y(asinf(vnorm.y()) / M_PI + 0.5);
+        }
+    }
+}
+
+/**
+ * Calculates the normal vectors of the model vertices.
+ */
+void
+Model::calculate_normals()
+{
+    LibMatrix::vec3 n;
+
+    for (std::vector<Object>::iterator iter = objects_.begin();
+         iter != objects_.end();
+         iter++)
+    {
+        Object &object = *iter;
+
+        for (vector<Face>::const_iterator f_iter = object.faces.begin();
+             f_iter != object.faces.end();
+             f_iter++)
+        {
+            const Face &face = *f_iter;
+            Vertex &a = object.vertices[face.a];
+            Vertex &b = object.vertices[face.b];
+            Vertex &c = object.vertices[face.c];
+
+            /* Calculate normal */
+            n = LibMatrix::vec3::cross(b.v - a.v, c.v - a.v);
+            n.normalize();
+            a.n += n;
+            b.n += n;
+            c.n += n;
+
+            LibMatrix::vec3 q1(b.v - a.v);
+            LibMatrix::vec3 q2(c.v - a.v);
+            LibMatrix::vec2 u1(b.t - a.t);
+            LibMatrix::vec2 u2(c.t - a.t);
+            float det = (u1.x() * u2.y() - u2.x() * u1.y());
+
+            /* Calculate tangent */
+            LibMatrix::vec3 nt;
+            nt.x(det * (u2.y() * q1.x() - u1.y() * q2.x()));
+            nt.y(det * (u2.y() * q1.y() - u1.y() * q2.y()));
+            nt.z(det * (u2.y() * q1.z() - u1.y() * q2.z()));
+            nt.normalize();
+            a.nt += nt;
+            b.nt += nt;
+            c.nt += nt;
+
+            /* Calculate bitangent */
+            LibMatrix::vec3 nb;
+            nb.x(det * (u1.x() * q2.x() - u2.x() * q1.x()));
+            nb.y(det * (u1.x() * q2.y() - u2.x() * q1.y()));
+            nb.z(det * (u1.x() * q2.z() - u2.x() * q1.z()));
+            nb.normalize();
+            a.nb += nb;
+            b.nb += nb;
+            c.nb += nb;
+        }
+
+        for (vector<Vertex>::iterator v_iter = object.vertices.begin();
+             v_iter != object.vertices.end();
+             v_iter++)
+        {
+            Vertex &v = *v_iter;
+            /* Orthogonalize */
+            v.nt = (v.nt - v.n * LibMatrix::vec3::dot(v.nt, v.n));
+            v.n.normalize();
+            v.nt.normalize();
+            v.nb.normalize();
+        }
+
+    }
+}
+
+/**
+ * Load a model from a 3DS file.
+ *
+ * @param filename the name of the file
+ *
+ * @return whether loading succeeded
+ */
+bool
+Model::load_3ds(const std::string &filename)
+{
+    Object *object(0);
+
+    Log::debug("Loading model from 3ds file '%s'\n", filename.c_str());
+
+    const std::auto_ptr<std::istream> input_file_ptr(Util::get_resource(filename));
+    std::istream& input_file(*input_file_ptr);
+
+    if (!input_file) {
+        Log::error("Could not open 3ds file '%s'\n", filename.c_str());
+        return false;
+    }
+
+    // Loop to scan the whole file
+    while (!input_file.eof()) {
+        uint16_t chunk_id;
+        uint32_t chunk_length;
+
+        // Read the chunk header
+        input_file.read(reinterpret_cast<char *>(&chunk_id), 2);
+        if (input_file.gcount() == 0) {
+            continue;
+        }
+        else if (input_file.gcount() < 2) {
+            Log::error("%s: %d: Failed to read %zd bytes from 3ds file (read %zd)\n",
+                       __FUNCTION__, __LINE__, 2, input_file.gcount());
+            return false;
+        }
+
+        //Read the lenght of the chunk
+        read_or_fail(input_file, &chunk_length, 4);
+
+        switch (chunk_id)
+        {
+            //----------------- MAIN3DS -----------------
+            // Description: Main chunk, contains all the other chunks
+            // Chunk ID: 4d4d
+            // Chunk Lenght: 0 + sub chunks
+            //-------------------------------------------
+            case 0x4d4d:
+                break;
+
+            //----------------- EDIT3DS -----------------
+            // Description: 3D Editor chunk, objects layout info
+            // Chunk ID: 3d3d (hex)
+            // Chunk Lenght: 0 + sub chunks
+            //-------------------------------------------
+            case 0x3d3d:
+                break;
+
+            //--------------- EDIT_OBJECT ---------------
+            // Description: Object block, info for each object
+            // Chunk ID: 4000 (hex)
+            // Chunk Lenght: len(object name) + sub chunks
+            //-------------------------------------------
+            case 0x4000:
+                {
+                std::stringstream ss;
+                unsigned char c = 1;
+
+                for (int i = 0; i < 20 && c != '\0'; i++) {
+                    read_or_fail(input_file, &c, 1);
+                    ss << c;
+                }
+
+                objects_.push_back(Object(ss.str()));
+                object = &objects_.back();
+                }
+                break;
+
+            //--------------- OBJ_TRIMESH ---------------
+            // Description: Triangular mesh, contains chunks for 3d mesh info
+            // Chunk ID: 4100 (hex)
+            // Chunk Lenght: 0 + sub chunks
+            //-------------------------------------------
+            case 0x4100:
+                break;
+
+            //--------------- TRI_VERTEXL ---------------
+            // Description: Vertices list
+            // Chunk ID: 4110 (hex)
+            // Chunk Lenght: 1 x unsigned short (number of vertices)
+            //             + 3 x float (vertex coordinates) x (number of vertices)
+            //             + sub chunks
+            //-------------------------------------------
+            case 0x4110:
+                {
+                uint16_t qty;
+                read_or_fail(input_file, &qty, sizeof(uint16_t));
+                object->vertices.resize(qty);
+
+                for (uint16_t i = 0; i < qty; i++) {
+                    float f[3];
+                    read_or_fail(input_file, f, sizeof(float) * 3);
+                    object->vertices[i].v.x(f[0]);
+                    object->vertices[i].v.y(f[1]);
+                    object->vertices[i].v.z(f[2]);
+                }
+                }
+                break;
+
+            //--------------- TRI_FACEL1 ----------------
+            // Description: Polygons (faces) list
+            // Chunk ID: 4120 (hex)
+            // Chunk Lenght: 1 x unsigned short (number of polygons)
+            //             + 3 x unsigned short (polygon points) x (number of polygons)
+            //             + sub chunks
+            //-------------------------------------------
+            case 0x4120:
+                {
+                uint16_t qty;
+                read_or_fail(input_file, &qty, sizeof(uint16_t));
+                object->faces.resize(qty);
+                for (uint16_t i = 0; i < qty; i++) {
+                    read_or_fail(input_file, &object->faces[i].a, sizeof(uint16_t));
+                    read_or_fail(input_file, &object->faces[i].b, sizeof(uint16_t));
+                    read_or_fail(input_file, &object->faces[i].c, sizeof(uint16_t));
+                    read_or_fail(input_file, &object->faces[i].face_flags, sizeof(uint16_t));
+                }
+                }
+                break;
+
+            //------------- TRI_MAPPINGCOORS ------------
+            // Description: Vertices list
+            // Chunk ID: 4140 (hex)
+            // Chunk Lenght: 1 x unsigned short (number of mapping points)
+            //             + 2 x float (mapping coordinates) x (number of mapping points)
+            //             + sub chunks
+            //-------------------------------------------
+            case 0x4140:
+                {
+                uint16_t qty;
+                read_or_fail(input_file, &qty, sizeof(uint16_t));
+                for (uint16_t i = 0; i < qty; i++) {
+                    float f[2];
+                    read_or_fail(input_file, f, sizeof(float) * 2);
+                    object->vertices[i].t.x(f[0]);
+                    object->vertices[i].t.y(f[1]);
+                }
+                }
+                gotTexcoords_ = true;
+                break;
+
+            //----------- Skip unknow chunks ------------
+            //We need to skip all the chunks that currently we don't use
+            //We use the chunk lenght information to set the file pointer
+            //to the same level next chunk
+            //-------------------------------------------
+            default:
+                input_file.seekg(chunk_length - 6, std::ios::cur);
+        }
+    }
+
+    // Compute bounding box for perspective projection
+    compute_bounding_box(*object);
+
+    if (Options::show_debug) {
+        for (std::vector<Object>::const_iterator iter = objects_.begin();
+             iter != objects_.end();
+             iter++)
+        {
+            Log::debug("    Object name: %s Vertex count: %d Face count: %d\n",
+                       iter->name.c_str(), iter->vertices.size(), iter->faces.size());
+        }
+    }
+
+    return true;
+}
+
+/**
+ * Parse vec3 values from an OBJ file.
+ *
+ * @param source the source line to parse
+ * @param v the vec3 to populate
+ */
+static void
+obj_get_values(const string& source, vec3& v)
+{
+    // Skip the definition type...
+    string::size_type endPos = source.find(" ");
+    string::size_type startPos(0);
+    if (endPos == string::npos)
+    {
+        Log::error("Bad element '%s'\n", source.c_str());
+        return;
+    }
+    // Find the first value...
+    startPos = endPos + 1;
+    endPos = source.find(" ", startPos);
+    if (endPos == string::npos)
+    {
+        Log::error("Bad element '%s'\n", source.c_str());
+        return;
+    }
+    string::size_type numChars(endPos - startPos);
+    string xs(source, startPos, numChars);
+    float x = Util::fromString<float>(xs);
+    // Then the second value...
+    startPos = endPos + 1;
+    endPos = source.find(" ", startPos);
+    if (endPos == string::npos)
+    {
+        Log::error("Bad element '%s'\n", source.c_str());
+        return;
+    }
+    numChars = endPos - startPos;
+    string ys(source, startPos, numChars);
+    float y = Util::fromString<float>(ys);
+    // And the third value (there might be a fourth, but we don't care)...
+    startPos = endPos + 1;
+    endPos = source.find(" ", startPos);
+    if (endPos == string::npos)
+    {
+        numChars = endPos;
+    }
+    else
+    {
+        numChars = endPos - startPos;
+    }
+    string zs(source, startPos, endPos - startPos);
+    float z = Util::fromString<float>(zs);
+    v.x(x);
+    v.y(y);
+    v.z(z);
+}
+
+/**
+ * Parse uvec3 values from an OBJ file.
+ *
+ * @param source the source line to parse
+ * @param v the uvec3 to populate
+ */
+static void
+obj_get_values(const string& source, uvec3& v)
+{
+    // Skip the definition type...
+    string::size_type endPos = source.find(" ");
+    string::size_type startPos(0);
+    if (endPos == string::npos)
+    {
+        Log::error("Bad element '%s'\n", source.c_str());
+        return;
+    }
+    // Find the first value...
+    startPos = endPos + 1;
+    endPos = source.find(" ", startPos);
+    if (endPos == string::npos)
+    {
+        Log::error("Bad element '%s'\n", source.c_str());
+        return;
+    }
+    string::size_type numChars(endPos - startPos);
+    string xs(source, startPos, numChars);
+    unsigned int x = Util::fromString<unsigned int>(xs);
+    // Then the second value...
+    startPos = endPos+1;
+    endPos = source.find(" ", startPos);
+    if (endPos == string::npos)
+    {
+        Log::error("Bad element '%s'\n", source.c_str());
+        return;
+    }
+    numChars = endPos - startPos;
+    string ys(source, startPos, numChars);
+    unsigned int y = Util::fromString<unsigned int>(ys);
+    // And the third value (there might be a fourth, but we don't care)...
+    startPos = endPos + 1;
+    endPos = source.find(" ", startPos);
+    if (endPos == string::npos)
+    {
+        numChars = endPos;
+    }
+    else
+    {
+        numChars = endPos - startPos;
+    }
+    string zs(source, startPos, numChars);
+    unsigned int z = Util::fromString<unsigned int>(zs);
+    v.x(x);
+    v.y(y);
+    v.z(z);
+}
+
+/**
+ * Load a model from an OBJ file.
+ *
+ * @param filename the name of the file
+ *
+ * @return whether loading succeeded
+ */
+bool
+Model::load_obj(const std::string &filename)
+{
+    Log::debug("Loading model from obj file '%s'\n", filename.c_str());
+
+    const std::auto_ptr<std::istream> input_file_ptr(Util::get_resource(filename));
+    std::istream& inputFile(*input_file_ptr);
+    if (!inputFile)
+    {
+        Log::error("Failed to open '%s'\n", filename.c_str());
+        return false;
+    }
+
+    vector<string> sourceVec;
+    string curLine;
+    while (getline(inputFile, curLine))
+    {
+        sourceVec.push_back(curLine);
+    }
+
+    // Give ourselves an object to populate.
+    objects_.push_back(Object(filename));
+    Object& object(objects_.back());
+
+    static const string vertex_definition("v");
+    static const string normal_definition("vn");
+    static const string texcoord_definition("vt");
+    static const string face_definition("f");
+    for (vector<string>::const_iterator lineIt = sourceVec.begin();
+         lineIt != sourceVec.end();
+         lineIt++)
+    {
+        const string& curSrc = *lineIt;
+        // Is it a vertex attribute, a face description, comment or other?
+        // We only care about the first two, we ignore comments, object names,
+        // group names, smoothing groups, etc.
+        string::size_type startPos(0);
+        string::size_type spacePos = curSrc.find(" ", startPos);
+        string definitionType(curSrc, startPos, spacePos - startPos);
+        if (definitionType == vertex_definition)
+        {
+            Vertex v;
+            obj_get_values(curSrc, v.v);
+            object.vertices.push_back(v);
+        }
+        else if (definitionType == normal_definition)
+        {
+            // If we encounter an OBJ model with normals, we can update this
+            // to update object.vertices.n directly
+            Log::debug("We got a normal...\n");
+        }
+        else if (definitionType == texcoord_definition)
+        {
+            // If we encounter an OBJ model with normals, we can update this
+            // to update object.vertices.t directly
+            Log::debug("We got a texcoord...\n");
+        }
+        else if (definitionType == face_definition)
+        {
+            uvec3 v;
+            obj_get_values(curSrc, v);
+            Face f;
+            // OBJ models index from '1'.
+            f.a = v.x() - 1;
+            f.b = v.y() - 1;
+            f.c = v.z() - 1;
+            object.faces.push_back(f);
+        }
+    }
+    // Compute bounding box for perspective projection
+    compute_bounding_box(object);
+
+    Log::debug("Object populated with %u vertices and %u faces.\n",
+        object.vertices.size(), object.faces.size());
+    return true;
+}
+
+namespace ModelPrivate
+{
+ModelMap modelMap;
+}
+
+/**
+ * Locate all available models.
+ *
+ * This method scans the built-in data paths and build a database of usable
+ * models available to scenes.  Map is available on a read-only basis to scenes
+ * that might find it useful for listing models, etc.
+ *
+ * @return a map containing information about the located models
+ */
+const ModelMap&
+Model::find_models()
+{
+    if (!ModelPrivate::modelMap.empty())
+    {
+        return ModelPrivate::modelMap;
+    }
+    vector<string> pathVec;
+    string dataDir(GLMARK_DATA_PATH"/models");
+    Util::list_files(dataDir, pathVec);
+#ifdef GLMARK_EXTRAS_PATH
+    string extrasDir(GLMARK_EXTRAS_PATH"/models");
+    Util::list_files(extrasDir, pathVec);
+#endif
+
+    // Now that we have a list of all of the model files available to us,
+    // let's go through and pull out the names and what format they're in
+    // so the scene can decide which ones to use.
+    for(vector<string>::const_iterator pathIt = pathVec.begin();
+        pathIt != pathVec.end();
+        pathIt++)
+    {
+        const string& curPath = *pathIt;
+        string::size_type namePos(0);
+        string::size_type slashPos = curPath.rfind("/");
+        if (slashPos != string::npos)
+        {
+            // Advance to the first character after the last slash
+            namePos = slashPos + 1;
+        }
+
+        ModelFormat format(MODEL_INVALID);
+        string::size_type extPos = curPath.rfind(".3ds");
+        if (extPos == string::npos)
+        {
+            // It's not a 3ds model
+            extPos = curPath.rfind(".obj");
+            if (extPos == string::npos)
+            {
+                // It's not an obj model either, so skip it.
+                continue;
+            }
+            format = MODEL_OBJ;
+        }
+        else
+        {
+            // It's a 3ds model
+            format = MODEL_3DS;
+        }
+
+        string name(curPath, namePos, extPos - namePos);
+        ModelDescriptor* desc = new ModelDescriptor(name, format, curPath);
+        ModelPrivate::modelMap.insert(std::make_pair(name, desc));
+    }
+
+    return ModelPrivate::modelMap;
+}
+
+/**
+ * Load a model by name.
+ *
+ * You must initialize the available model collection using
+ * Model::find_models() before using this method.
+ *
+ * @param modelName the model name
+ *
+ * @return whether the operation succeeded
+ */
+bool
+Model::load(const string& modelName)
+{
+    bool retVal(false);
+    ModelMap::const_iterator modelIt = ModelPrivate::modelMap.find(modelName);
+    if (modelIt == ModelPrivate::modelMap.end())
+    {
+        return retVal;
+    }
+
+    ModelDescriptor* desc = modelIt->second;
+    switch (desc->format())
+    {
+        case MODEL_INVALID:
+            break;
+        case MODEL_3DS:
+            retVal = load_3ds(desc->pathname());
+            break;
+        case MODEL_OBJ:
+            retVal = load_obj(desc->pathname());
+            break;
+    }
+
+    return retVal;
+}
diff --git a/src/model.h b/src/model.h
new file mode 100644
index 0000000..0d7d4b9
--- /dev/null
+++ b/src/model.h
@@ -0,0 +1,131 @@
+/*
+ * Copyright © 2008 Ben Smith
+ * Copyright © 2010-2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Ben Smith (original glmark benchmark)
+ *  Alexandros Frantzis (glmark2)
+ */
+#ifndef GLMARK2_MODEL_H_
+#define GLMARK2_MODEL_H_
+
+#include <stdint.h>
+#include <string>
+#include <vector>
+#include <map>
+#include "vec.h"
+
+// Forward declare the mesh object.  We don't need the whole header here.
+class Mesh;
+
+enum ModelFormat
+{
+    MODEL_INVALID,
+    MODEL_3DS,
+    MODEL_OBJ
+};
+
+/**
+ * A descriptor for a model file.
+ */
+class ModelDescriptor
+{
+    std::string name_;
+    std::string pathname_;
+    ModelFormat format_;
+    ModelDescriptor();
+public:
+    ModelDescriptor(const std::string& name, ModelFormat format,
+                    const std::string& pathname) :
+        name_(name),
+        pathname_(pathname),
+        format_(format) {}
+    ~ModelDescriptor() {}
+    const std::string& pathname() const { return pathname_; }
+    ModelFormat format() const { return format_; }
+};
+
+typedef std::map<std::string, ModelDescriptor*> ModelMap;
+
+/**
+ * A model as loaded from a 3D object data file.
+ */
+class Model
+{
+public:
+
+    typedef enum {
+        AttribTypePosition = 1,
+        AttribTypeNormal,
+        AttribTypeTexcoord,
+        AttribTypeTangent,
+        AttribTypeBitangent,
+        AttribTypeCustom
+    } AttribType;
+
+    Model() : gotTexcoords_(false) {}
+    ~Model() {}
+
+    bool load(const std::string& name);
+
+    bool needTexcoords() const { return !gotTexcoords_; }
+    void calculate_texcoords();
+    void calculate_normals();
+    void convert_to_mesh(Mesh &mesh);
+    void convert_to_mesh(Mesh &mesh,
+                         const std::vector<std::pair<AttribType, int> > &attribs);
+    const LibMatrix::vec3& minVec() const { return minVec_; }
+    const LibMatrix::vec3& maxVec() const { return maxVec_; }
+    static const ModelMap& find_models();
+private:
+    // If the model we loaded contained texcoord data...
+    bool gotTexcoords_;
+    struct Face {
+        uint32_t a, b, c;
+        uint16_t face_flags;
+    };
+
+    struct Vertex {
+        LibMatrix::vec3 v;
+        LibMatrix::vec3 n;
+        LibMatrix::vec2 t;
+        LibMatrix::vec3 nt;
+        LibMatrix::vec3 nb;
+    };
+
+    struct Object {
+        Object(const std::string &name) : name(name) {}
+        std::string name;
+        std::vector<Vertex> vertices;
+        std::vector<Face> faces;
+    };
+
+    void append_object_to_mesh(const Object &object, Mesh &mesh,
+                               int p_pos, int n_pos, int t_pos,
+                               int nt_pos, int nb_pos);
+    bool load_3ds(const std::string &filename);
+    bool load_obj(const std::string &filename);
+
+    // For vertices of the bounding box for this model.
+    void compute_bounding_box(const Object& object);
+    LibMatrix::vec3 minVec_;
+    LibMatrix::vec3 maxVec_;
+    std::vector<Object> objects_;
+};
+
+#endif
diff --git a/src/options.cpp b/src/options.cpp
new file mode 100644
index 0000000..2ff1540
--- /dev/null
+++ b/src/options.cpp
@@ -0,0 +1,201 @@
+/*
+ * Copyright © 2011-2012 Linaro Limited
+ *
+ * This file is part of glcompbench.
+ *
+ * glcompbench is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * glcompbench is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with glcompbench.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis <alexandros.frantzis@linaro.org>
+ *  Jesse Barker <jesse.barker@linaro.org>
+ */
+
+#include <cstring>
+#include <cstdlib>
+#include <cstdio>
+#include <getopt.h>
+#include <sstream>
+
+#include "options.h"
+#include "util.h"
+
+std::vector<std::string> Options::benchmarks;
+std::vector<std::string> Options::benchmark_files;
+bool Options::validate = false;
+Options::FrameEnd Options::frame_end = Options::FrameEndDefault;
+std::pair<int,int> Options::size(800, 600);
+bool Options::list_scenes = false;
+bool Options::show_all_options = false;
+bool Options::show_debug = false;
+bool Options::show_help = false;
+bool Options::reuse_context = false;
+bool Options::run_forever = false;
+bool Options::annotate = false;
+bool Options::offscreen = false;
+GLVisualConfig Options::visual_config;
+
+static struct option long_options[] = {
+    {"annotate", 0, 0, 0},
+    {"benchmark", 1, 0, 0},
+    {"benchmark-file", 1, 0, 0},
+    {"validate", 0, 0, 0},
+    {"frame-end", 1, 0, 0},
+    {"off-screen", 0, 0, 0},
+    {"visual-config", 1, 0, 0},
+    {"reuse-context", 0, 0, 0},
+    {"run-forever", 0, 0, 0},
+    {"size", 1, 0, 0},
+    {"fullscreen", 0, 0, 0},
+    {"list-scenes", 0, 0, 0},
+    {"show-all-options", 0, 0, 0},
+    {"debug", 0, 0, 0},
+    {"help", 0, 0, 0},
+    {0, 0, 0, 0}
+};
+
+/**
+ * Parses a size string of the form WxH
+ *
+ * @param str the string to parse
+ * @param size the parsed size (width, height)
+ */
+static void
+parse_size(const std::string &str, std::pair<int,int> &size)
+{
+    std::vector<std::string> d;
+    Util::split(str, 'x', d, Util::SplitModeNormal);
+
+    size.first = Util::fromString<int>(d[0]);
+
+    /*
+     * Parse the second element (height). If there is none, use the value
+     * of the first element for the second (width = height)
+     */
+    if (d.size() > 1)
+        size.second = Util::fromString<int>(d[1]);
+    else
+        size.second = size.first;
+}
+
+/**
+ * Parses a frame-end method string
+ *
+ * @param str the string to parse
+ *
+ * @return the parsed frame end method
+ */
+static Options::FrameEnd 
+frame_end_from_str(const std::string &str)
+{
+    Options::FrameEnd m = Options::FrameEndDefault;
+
+    if (str == "swap")
+        m = Options::FrameEndSwap;
+    else if (str == "finish")
+        m = Options::FrameEndFinish;
+    else if (str == "readpixels")
+        m = Options::FrameEndReadPixels;
+    else if (str == "none")
+        m = Options::FrameEndNone;
+
+    return m;
+}
+
+void
+Options::print_help()
+{
+    printf("A benchmark for Open GL (ES) 2.0\n"
+           "\n"
+           "Options:\n"
+           "  -b, --benchmark BENCH  A benchmark to run: 'scene(:opt1=val1)*'\n"
+           "                         (the option can be used multiple times)\n"
+           "  -f, --benchmark-file F Load benchmarks to run from a file containing a\n"
+           "                         list of benchmark descriptions (one per line)\n"
+           "                         (the option can be used multiple times)\n"
+           "      --validate         Run a quick output validation test instead of \n"
+           "                         running the benchmarks\n"
+           "      --frame-end METHOD How to end a frame [default,none,swap,finish,readpixels]\n"
+           "      --off-screen       Render to an off-screen surface\n"
+           "      --visual-config C  The visual configuration to use for the rendering\n"
+           "                         target: 'red=R:green=G:blue=B:alpha=A:buffer=BUF'.\n"
+           "                         The parameters may be defined in any order, and any\n"
+           "                         omitted parameters assume a default value of '1'\n"
+           "      --reuse-context    Use a single context for all scenes\n"
+           "                         (by default, each scene gets its own context)\n"
+           "  -s, --size WxH         Size of the output window (default: 800x600)\n"
+           "      --fullscreen       Run in fullscreen mode (equivalent to --size -1x-1)\n"
+           "  -l, --list-scenes      Display information about the available scenes\n"
+           "                         and their options\n"
+           "      --show-all-options Show all scene option values used for benchmarks\n"
+           "                         (only explicitly set options are shown by default)\n"
+           "      --run-forever      Run indefinitely, looping from the last benchmark\n"
+           "                         back to the first\n"
+           "      --annotate         Annotate the benchmarks with on-screen information\n"
+           "                         (same as -b :show-fps=true:title=#info#)\n"
+           "  -d, --debug            Display debug messages\n"
+           "  -h, --help             Display help\n");
+}
+
+bool
+Options::parse_args(int argc, char **argv)
+{
+    while (1) {
+        int option_index = -1;
+        int c;
+        const char *optname = "";
+
+        c = getopt_long(argc, argv, "b:f:s:ldh",
+                        long_options, &option_index);
+        if (c == -1)
+            break;
+        if (c == ':' || c == '?')
+            return false;
+
+        if (option_index != -1)
+            optname = long_options[option_index].name;
+
+        if (!strcmp(optname, "annotate"))
+            Options::annotate = true;
+        if (c == 'b' || !strcmp(optname, "benchmark"))
+            Options::benchmarks.push_back(optarg);
+        else if (c == 'f' || !strcmp(optname, "benchmark-file"))
+            Options::benchmark_files.push_back(optarg);
+        else if (!strcmp(optname, "validate"))
+            Options::validate = true;
+        else if (!strcmp(optname, "frame-end"))
+            Options::frame_end = frame_end_from_str(optarg);
+        else if (!strcmp(optname, "off-screen"))
+            Options::offscreen = true;
+        else if (!strcmp(optname, "visual-config"))
+            Options::visual_config = GLVisualConfig(optarg);
+        else if (!strcmp(optname, "reuse-context"))
+            Options::reuse_context = true;
+        else if (c == 's' || !strcmp(optname, "size"))
+            parse_size(optarg, Options::size);
+        else if (!strcmp(optname, "fullscreen"))
+            Options::size = std::pair<int,int>(-1, -1);
+        else if (c == 'l' || !strcmp(optname, "list-scenes"))
+            Options::list_scenes = true;
+        else if (!strcmp(optname, "show-all-options"))
+            Options::show_all_options = true;
+        else if (!strcmp(optname, "run-forever"))
+            Options::run_forever = true;
+        else if (c == 'd' || !strcmp(optname, "debug"))
+            Options::show_debug = true;
+        else if (c == 'h' || !strcmp(optname, "help"))
+            Options::show_help = true;
+    }
+
+    return true;
+}
diff --git a/src/options.h b/src/options.h
new file mode 100644
index 0000000..f62e02a
--- /dev/null
+++ b/src/options.h
@@ -0,0 +1,59 @@
+/*
+ * Copyright © 2011 Linaro Limited
+ *
+ * This file is part of glcompbench.
+ *
+ * glcompbench is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * glcompbench is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with glcompbench.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis <alexandros.frantzis@linaro.org>
+ *  Jesse Barker <jesse.barker@linaro.org>
+ */
+
+#ifndef OPTIONS_H_
+#define OPTIONS_H_
+
+#include <string>
+#include <vector>
+#include "gl-visual-config.h"
+
+struct Options {
+    enum FrameEnd {
+        FrameEndDefault,
+        FrameEndNone,
+        FrameEndSwap,
+        FrameEndFinish,
+        FrameEndReadPixels
+    };
+
+    static bool parse_args(int argc, char **argv);
+    static void print_help();
+
+    static std::vector<std::string> benchmarks;
+    static std::vector<std::string> benchmark_files;
+    static bool validate;
+    static FrameEnd frame_end;
+    static std::pair<int,int> size;
+    static bool list_scenes;
+    static bool show_all_options;
+    static bool show_debug;
+    static bool show_help;
+    static bool reuse_context;
+    static bool run_forever;
+    static bool annotate;
+    static bool offscreen;
+    static GLVisualConfig visual_config;
+};
+
+#endif /* OPTIONS_H_ */
diff --git a/src/scene-buffer.cpp b/src/scene-buffer.cpp
new file mode 100644
index 0000000..ef3a0b9
--- /dev/null
+++ b/src/scene-buffer.cpp
@@ -0,0 +1,472 @@
+/*
+ * Copyright © 2010-2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis (glmark2)
+ *  Jesse Barker
+ */
+#include "scene.h"
+#include "log.h"
+#include "mat.h"
+#include "stack.h"
+#include "shader-source.h"
+#include "util.h"
+#include "gl-headers.h"
+#include <cmath>
+
+/***********************
+ * Wave implementation *
+ ***********************/
+
+/**
+ * A callback used to set up the grid by the Wave class.
+ * It is called for each "quad" of the grid.
+ */
+static void
+wave_grid_conf(Mesh &mesh, int x, int y, int n_x, int n_y,
+               LibMatrix::vec3 &ul,
+               LibMatrix::vec3 &ll,
+               LibMatrix::vec3 &ur,
+               LibMatrix::vec3 &lr)
+{
+    // These parameters are unused in this instance of a virtual callback
+    // function.
+    static_cast<void>(x);
+    static_cast<void>(y);
+    static_cast<void>(n_x);
+    static_cast<void>(n_y);
+
+    /*
+     * Order matters here, so that Wave::vertex_length_index() can work.
+     * Vertices of the triangles at index i that belong to length index i
+     * are even, those that belong to i + 1 are odd.
+     */
+    const LibMatrix::vec3* t[] = {
+        &ll, &ur, &ul, &ur, &ll, &lr
+    };
+
+    for (int i = 0; i < 6; i++) {
+        mesh.next_vertex();
+        /*
+         * Set the vertex position and the three vertex positions
+         * of the triangle this vertex belongs to.
+         */
+        mesh.set_attrib(0, *t[i]);
+        mesh.set_attrib(1, *t[3 * (i / 3)]);
+        mesh.set_attrib(2, *t[3 * (i / 3) + 1]);
+        mesh.set_attrib(3, *t[3 * (i / 3) + 2]);
+    }
+}
+
+/**
+ * Renders a grid mesh modulated by a sine wave
+ */
+class WaveMesh
+{
+public:
+    /**
+     * Creates a wave mesh.
+     *
+     * @param length the total length of the grid (in model coordinates)
+     * @param width the total width of the grid (in model coordinates)
+     * @param nlength the number of length-wise grid subdivisions
+     * @param nwidth the number of width-wise grid subdivisions
+     * @param wavelength the wave length as a proportion of the length
+     * @param duty_cycle the duty cycle ()
+     */
+    WaveMesh(double length, double width, size_t nlength, size_t nwidth,
+             double wavelength, double duty_cycle) :
+        length_(length), width_(width), nlength_(nlength), nwidth_(nwidth),
+        wave_k_(2 * M_PI / (wavelength * length)),
+        wave_period_(2.0 * M_PI / wave_k_),
+        wave_full_period_(wave_period_ / duty_cycle),
+        wave_velocity_(0.1 * length), displacement_(nlength + 1)
+    {
+        create_program();
+        create_mesh();
+    }
+
+
+    ~WaveMesh() { reset(); }
+
+    /**
+     * Updates the state of a wave mesh.
+     *
+     * @param elapsed the time elapsed since the beginning of the rendering
+     */
+    void update(double elapsed)
+    {
+        std::vector<std::vector<float> >& vertices(mesh_.vertices());
+
+        /* Figure out which length index ranges need update */
+        std::vector<std::pair<size_t, size_t> > ranges;
+
+        for (size_t n = 0; n <= nlength_; n++) {
+            double d(displacement(n, elapsed));
+
+            if (d != displacement_[n]) {
+                if (ranges.size() > 0 && ranges.back().second == n - 1) {
+                    ranges.back().second = n;
+                }
+                else {
+                    ranges.push_back(
+                            std::pair<size_t, size_t>(n > 0 ? n - 1 : 0, n)
+                            );
+                }
+            }
+
+            displacement_[n] = d;
+        }
+
+        /* Update the vertex data of the changed ranges */
+        for (std::vector<std::pair<size_t, size_t> >::iterator iter = ranges.begin();
+             iter != ranges.end();
+             iter++)
+        {
+            /* First vertex of length index range */
+            size_t vstart(iter->first * nwidth_ * 6 + (iter->first % 2));
+            /*
+             * First vertex not included in the range. We should also update all
+             * vertices of triangles touching index i.
+             */
+            size_t vend((iter->second + (iter->second < nlength_)) * nwidth_ * 6);
+
+            for (size_t v = vstart; v < vend; v++) {
+                size_t vt = 3 * (v / 3);
+                vertices[v][0 * 3 + 2] = displacement_[vertex_length_index(v)];
+                vertices[v][1 * 3 + 2] = displacement_[vertex_length_index(vt)];
+                vertices[v][2 * 3 + 2] = displacement_[vertex_length_index(vt + 1)];
+                vertices[v][3 * 3 + 2] = displacement_[vertex_length_index(vt + 2)];
+            }
+
+            /* Update pair with actual vertex range */
+            iter->first = vstart;
+            iter->second = vend - 1;
+        }
+
+        mesh_.update_vbo(ranges);
+    }
+
+    Mesh& mesh() { return mesh_; }
+    Program& program() { return program_; }
+
+    void reset()
+    {
+        program_.stop();
+        program_.release();
+        mesh_.reset();
+    }
+
+private:
+    Mesh mesh_;
+    Program program_;
+    double length_;
+    double width_;
+    size_t nlength_;
+    size_t nwidth_;
+    /* Wave parameters */
+    double wave_k_;
+    double wave_period_;
+    double wave_full_period_;
+    double wave_fill_;
+    double wave_velocity_;
+
+    std::vector<double> displacement_;
+
+    /**
+     * Calculates the length index of a vertex.
+     */
+    size_t vertex_length_index(size_t v)
+    {
+        return v / (6 * nwidth_) + (v % 2);
+    }
+
+    /**
+     * The sine wave function with duty-cycle.
+     *
+     * @param x the space coordinate
+     *
+     * @return the operation error code
+     */
+    double wave_func(double x)
+    {
+        double r(fmod(x, wave_full_period_));
+        if (r < 0)
+            r += wave_full_period_;
+
+        /*
+         * Return either the sine value or 0.0, depending on the
+         * wave duty cycle.
+         */
+        if (r > wave_period_)
+        {
+            return 0;
+        }
+        else
+        {
+            return 0.2 * std::sin(wave_k_ * r);
+        }
+    }
+
+    /**
+     * Calculates the displacement of the wave.
+     *
+     * @param n the length index
+     * @param elapsed the time elapsed since the beginning of the rendering
+     *
+     * @return the displacement at point n at time elapsed
+     */
+    double displacement(size_t n, double elapsed)
+    {
+        double x(n * length_ / nlength_);
+
+        return wave_func(x - wave_velocity_ * elapsed);
+    }
+
+    /**
+     * Creates the GL shader program.
+     */
+    void create_program()
+    {
+        /* Set up shaders */
+        static const std::string vtx_shader_filename(
+                GLMARK_DATA_PATH"/shaders/buffer-wireframe.vert");
+        static const std::string frg_shader_filename(
+                GLMARK_DATA_PATH"/shaders/buffer-wireframe.frag");
+
+        ShaderSource vtx_source(vtx_shader_filename);
+        ShaderSource frg_source(frg_shader_filename);
+
+        if (!Scene::load_shaders_from_strings(program_, vtx_source.str(),
+                                              frg_source.str()))
+        {
+            return;
+        }
+    }
+
+    /**
+     * Creates the grid mesh.
+     */
+    void create_mesh()
+    {
+        /*
+         * We need to pass the positions of all vertex of the triangle
+         * in order to draw the wireframe.
+         */
+        std::vector<int> vertex_format;
+        vertex_format.push_back(3);     // Position of vertex
+        vertex_format.push_back(3);     // Position of triangle vertex 0
+        vertex_format.push_back(3);     // Position of triangle vertex 1
+        vertex_format.push_back(3);     // Position of triangle vertex 2
+        mesh_.set_vertex_format(vertex_format);
+
+        std::vector<GLint> attrib_locations;
+        attrib_locations.push_back(program_["position"].location());
+        attrib_locations.push_back(program_["tvertex0"].location());
+        attrib_locations.push_back(program_["tvertex1"].location());
+        attrib_locations.push_back(program_["tvertex2"].location());
+        mesh_.set_attrib_locations(attrib_locations);
+
+        mesh_.make_grid(nlength_, nwidth_, length_, width_,
+                        0.0, wave_grid_conf);
+    }
+
+};
+
+/******************************
+ * SceneBuffer implementation *
+ ******************************/
+
+struct SceneBufferPrivate {
+    WaveMesh *wave;
+    SceneBufferPrivate() : wave(0) {}
+    ~SceneBufferPrivate() { delete wave; }
+};
+
+SceneBuffer::SceneBuffer(Canvas &pCanvas) :
+    Scene(pCanvas, "buffer")
+{
+    priv_ = new SceneBufferPrivate();
+    options_["interleave"] = Scene::Option("interleave", "false",
+                                           "Whether to interleave vertex attribute data",
+                                           "false,true");
+    options_["update-method"] = Scene::Option("update-method", "map",
+                                              "Which method to use to update vertex data",
+                                              "map,subdata");
+    options_["update-fraction"] = Scene::Option("update-fraction", "1.0",
+                                                "The fraction of the mesh length that is updated at every iteration (0.0-1.0)");
+    options_["update-dispersion"] = Scene::Option("update-dispersion", "0.0",
+                                                  "How dispersed the updates are [0.0 - 1.0]");
+    options_["columns"] = Scene::Option("columns", "100",
+                                       "The number of mesh subdivisions length-wise");
+    options_["rows"] = Scene::Option("rows", "20",
+                                      "The number of mesh subdisivisions width-wise");
+    options_["buffer-usage"] = Scene::Option("buffer-usage", "static",
+                                             "How the buffer will be used",
+                                             "static,stream,dynamic");
+}
+
+SceneBuffer::~SceneBuffer()
+{
+    delete priv_;
+}
+
+bool
+SceneBuffer::supported(bool show_errors)
+{
+    if (options_["update-method"].value != "subdata" &&
+        (GLExtensions::MapBuffer == 0 || GLExtensions::UnmapBuffer == 0))
+    {
+        if (show_errors) {
+            Log::error("Requested MapBuffer VBO update method but GL_OES_mapbuffer"
+                       " is not supported!\n");
+        }
+        return false;
+    }
+
+    return true;
+}
+
+bool
+SceneBuffer::load()
+{
+    running_ = false;
+
+    return true;
+}
+
+void
+SceneBuffer::unload()
+{
+}
+
+bool
+SceneBuffer::setup()
+{
+    using LibMatrix::vec3;
+
+    if (!Scene::setup())
+        return false;
+
+    bool interleave = (options_["interleave"].value == "true");
+    Mesh::VBOUpdateMethod update_method;
+    Mesh::VBOUsage usage;
+    double update_fraction;
+    double update_dispersion;
+    size_t nlength;
+    size_t nwidth;
+
+    if (options_["update-method"].value == "map")
+        update_method = Mesh::VBOUpdateMethodMap;
+    else if (options_["update-method"].value == "subdata")
+        update_method = Mesh::VBOUpdateMethodSubData;
+    else
+        update_method = Mesh::VBOUpdateMethodMap;
+
+    if (options_["buffer-usage"].value == "static")
+        usage = Mesh::VBOUsageStatic;
+    else if (options_["buffer-usage"].value == "stream")
+        usage = Mesh::VBOUsageStream;
+    else
+        usage = Mesh::VBOUsageDynamic;
+
+    update_fraction = Util::fromString<double>(options_["update-fraction"].value);
+    update_dispersion = Util::fromString<double>(options_["update-dispersion"].value);
+    nlength = Util::fromString<size_t>(options_["columns"].value);
+    nwidth = Util::fromString<size_t>(options_["rows"].value);
+
+
+    priv_->wave = new WaveMesh(5.0, 2.0, nlength, nwidth,
+                               update_fraction * (1.0 - update_dispersion + 0.0001),
+                               update_fraction);
+
+    priv_->wave->mesh().interleave(interleave);
+    priv_->wave->mesh().vbo_update_method(update_method);
+    priv_->wave->mesh().vbo_usage(usage);
+    priv_->wave->mesh().build_vbo();
+
+    priv_->wave->program().start();
+    priv_->wave->program()["Viewport"] = LibMatrix::vec2(canvas_.width(), canvas_.height());
+
+    glDisable(GL_CULL_FACE);
+
+    currentFrame_ = 0;
+    running_ = true;
+    startTime_ = Util::get_timestamp_us() / 1000000.0;
+    lastUpdateTime_ = startTime_;
+
+    return true;
+}
+
+void
+SceneBuffer::teardown()
+{
+    delete priv_->wave;
+    priv_->wave = 0;
+
+    glEnable(GL_CULL_FACE);
+
+    Scene::teardown();
+}
+
+void
+SceneBuffer::update()
+{
+    Scene::update();
+
+    double elapsed_time = lastUpdateTime_ - startTime_;
+
+    priv_->wave->update(elapsed_time);
+}
+
+void
+SceneBuffer::draw()
+{
+    LibMatrix::Stack4 model_view;
+
+    // Load the ModelViewProjectionMatrix uniform in the shader
+    LibMatrix::mat4 model_view_proj(canvas_.projection());
+    model_view.translate(0.0, 0.0, -4.0);
+    model_view.rotate(45.0, -1.0, 0.0, 0.0);
+    model_view_proj *= model_view.getCurrent();
+
+    priv_->wave->program()["ModelViewProjectionMatrix"] = model_view_proj;
+
+    priv_->wave->mesh().render_vbo();
+}
+
+Scene::ValidationResult
+SceneBuffer::validate()
+{
+    static const double radius_3d(std::sqrt(3.0 * 2.0 * 2.0));
+
+    Canvas::Pixel ref(0x34, 0x99, 0xd7, 0xff);
+    Canvas::Pixel pixel = canvas_.read_pixel(402, 189);
+
+    double dist = pixel.distance_rgb(ref);
+    if (dist < radius_3d + 0.01) {
+        return Scene::ValidationSuccess;
+    }
+    else {
+        Log::debug("Validation failed! Expected: 0x%x Actual: 0x%x Distance: %f\n",
+                    ref.to_le32(), pixel.to_le32(), dist);
+        return Scene::ValidationFailure;
+    }
+
+    return Scene::ValidationUnknown;
+}
diff --git a/src/scene-build.cpp b/src/scene-build.cpp
new file mode 100644
index 0000000..22c948a
--- /dev/null
+++ b/src/scene-build.cpp
@@ -0,0 +1,268 @@
+/*
+ * Copyright © 2008 Ben Smith
+ * Copyright © 2010-2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Ben Smith (original glmark benchmark)
+ *  Alexandros Frantzis (glmark2)
+ *  Jesse Barker (glmark2)
+ */
+#include "scene.h"
+#include "log.h"
+#include "mat.h"
+#include "stack.h"
+#include "shader-source.h"
+#include "model.h"
+#include "util.h"
+#include <cmath>
+
+SceneBuild::SceneBuild(Canvas &pCanvas) :
+    Scene(pCanvas, "build"),
+    orientModel_(false)
+{
+    const ModelMap& modelMap = Model::find_models();
+    std::string optionValues;
+    for (ModelMap::const_iterator modelIt = modelMap.begin();
+         modelIt != modelMap.end();
+         modelIt++)
+    {
+        static bool doSeparator(false);
+        if (doSeparator)
+        {
+            optionValues += ",";
+        }
+        const std::string& curName = modelIt->first;
+        optionValues += curName;
+        doSeparator = true;
+    }
+    options_["use-vbo"] = Scene::Option("use-vbo", "true",
+                                        "Whether to use VBOs for rendering",
+                                        "false,true");
+    options_["interleave"] = Scene::Option("interleave", "false",
+                                           "Whether to interleave vertex attribute data",
+                                           "false,true");
+    options_["model"] = Scene::Option("model", "horse", "Which model to use",
+                                      optionValues);
+}
+
+SceneBuild::~SceneBuild()
+{
+}
+
+bool
+SceneBuild::load()
+{
+    rotationSpeed_ = 36.0f;
+
+    running_ = false;
+
+    return true;
+}
+
+void
+SceneBuild::unload()
+{
+    mesh_.reset();
+}
+
+bool
+SceneBuild::setup()
+{
+    using LibMatrix::vec3;
+
+    if (!Scene::setup())
+        return false;
+
+    /* Set up shaders */
+    static const std::string vtx_shader_filename(GLMARK_DATA_PATH"/shaders/light-basic.vert");
+    static const std::string frg_shader_filename(GLMARK_DATA_PATH"/shaders/light-basic.frag");
+    static const LibMatrix::vec4 lightPosition(20.0f, 20.0f, 10.0f, 1.0f);
+    static const LibMatrix::vec4 materialDiffuse(1.0f, 1.0f, 1.0f, 1.0f);
+
+    ShaderSource vtx_source(vtx_shader_filename);
+    ShaderSource frg_source(frg_shader_filename);
+
+    vtx_source.add_const("LightSourcePosition", lightPosition);
+    vtx_source.add_const("MaterialDiffuse", materialDiffuse);
+
+    if (!Scene::load_shaders_from_strings(program_, vtx_source.str(),
+                                          frg_source.str()))
+    {
+        return false;
+    }
+
+    Model model;
+    const std::string& whichModel(options_["model"].value);
+    bool modelLoaded = model.load(whichModel);
+
+    if(!modelLoaded)
+        return false;
+
+    // Now that we're successfully loaded, there are a few quirks about
+    // some of the known models that we need to account for.  The draw
+    // logic for the scene wants to rotate the model around the Y axis.
+    // Most of our models are described this way.  Some need adjustment
+    // (an additional rotation that gets the model into the correct
+    // orientation).
+    //
+    // Here's a summary:
+    //
+    // Angel rotates around the Y axis
+    // Armadillo rotates around the Y axis
+    // Buddha rotates around the X axis
+    // Bunny rotates around the Y axis
+    // Dragon rotates around the X axis
+    // Horse rotates around the Y axis
+    if (whichModel == "buddha" || whichModel == "dragon")
+    {
+        orientModel_ = true;
+        orientationAngle_ = -90.0;
+        orientationVec_ = vec3(1.0, 0.0, 0.0);
+    }
+    else if (whichModel == "armadillo")
+    {
+        orientModel_ = true;
+        orientationAngle_ = 180.0; 
+        orientationVec_ = vec3(0.0, 1.0, 0.0);
+    }
+
+    model.calculate_normals();
+
+    /* Tell the converter that we only care about position and normal attributes */
+    std::vector<std::pair<Model::AttribType, int> > attribs;
+    attribs.push_back(std::pair<Model::AttribType, int>(Model::AttribTypePosition, 3));
+    attribs.push_back(std::pair<Model::AttribType, int>(Model::AttribTypeNormal, 3));
+
+    model.convert_to_mesh(mesh_, attribs);
+
+    std::vector<GLint> attrib_locations;
+    attrib_locations.push_back(program_["position"].location());
+    attrib_locations.push_back(program_["normal"].location());
+    mesh_.set_attrib_locations(attrib_locations);
+
+    useVbo_ = (options_["use-vbo"].value == "true");
+    bool interleave = (options_["interleave"].value == "true");
+
+    mesh_.vbo_update_method(Mesh::VBOUpdateMethodMap);
+    mesh_.interleave(interleave);
+
+    if (useVbo_)
+        mesh_.build_vbo();
+    else
+        mesh_.build_array();
+
+    /* Calculate a projection matrix that is a good fit for the model */
+    vec3 maxVec = model.maxVec();
+    vec3 minVec = model.minVec();
+    vec3 diffVec = maxVec - minVec;
+    centerVec_ = maxVec + minVec;
+    centerVec_ /= 2.0;
+    float diameter = diffVec.length();
+    radius_ = diameter / 2;
+    float fovy = 2.0 * atanf(radius_ / (2.0 + radius_));
+    fovy /= M_PI;
+    fovy *= 180.0;
+    float aspect(static_cast<float>(canvas_.width())/static_cast<float>(canvas_.height()));
+    perspective_.setIdentity();
+    perspective_ *= LibMatrix::Mat4::perspective(fovy, aspect, 2.0, 2.0 + diameter);
+
+    program_.start();
+
+    currentFrame_ = 0;
+    rotation_ = 0.0;
+    running_ = true;
+    startTime_ = Util::get_timestamp_us() / 1000000.0;
+    lastUpdateTime_ = startTime_;
+
+    return true;
+}
+
+void
+SceneBuild::teardown()
+{
+    program_.stop();
+    program_.release();
+
+    mesh_.reset();
+
+    Scene::teardown();
+}
+
+void
+SceneBuild::update()
+{
+    Scene::update();
+
+    double elapsed_time = lastUpdateTime_ - startTime_;
+
+    rotation_ = rotationSpeed_ * elapsed_time;
+}
+
+void
+SceneBuild::draw()
+{
+    LibMatrix::Stack4 model_view;
+
+    // Load the ModelViewProjectionMatrix uniform in the shader
+    LibMatrix::mat4 model_view_proj(perspective_);
+    model_view.translate(-centerVec_.x(), -centerVec_.y(), -(centerVec_.z() + 2.0 + radius_));
+    model_view.rotate(rotation_, 0.0f, 1.0f, 0.0f);
+    if (orientModel_)
+    {
+        model_view.rotate(orientationAngle_, orientationVec_.x(), orientationVec_.y(), orientationVec_.z());
+    }
+    model_view_proj *= model_view.getCurrent();
+
+    program_["ModelViewProjectionMatrix"] = model_view_proj;
+
+    // Load the NormalMatrix uniform in the shader. The NormalMatrix is the
+    // inverse transpose of the model view matrix.
+    LibMatrix::mat4 normal_matrix(model_view.getCurrent());
+    normal_matrix.inverse().transpose();
+    program_["NormalMatrix"] = normal_matrix;
+
+    if (useVbo_) {
+        mesh_.render_vbo();
+    }
+    else {
+        mesh_.render_array();
+    }
+}
+
+Scene::ValidationResult
+SceneBuild::validate()
+{
+    static const double radius_3d(std::sqrt(3.0));
+
+    if (rotation_ != 0)
+        return Scene::ValidationUnknown;
+
+    Canvas::Pixel ref(0xa7, 0xa7, 0xa7, 0xff);
+    Canvas::Pixel pixel = canvas_.read_pixel(canvas_.width() / 2,
+                                             canvas_.height() / 2);
+
+    double dist = pixel.distance_rgb(ref);
+    if (dist < radius_3d + 0.01) {
+        return Scene::ValidationSuccess;
+    }
+    else {
+        Log::debug("Validation failed! Expected: 0x%x Actual: 0x%x Distance: %f\n",
+                    ref.to_le32(), pixel.to_le32(), dist);
+        return Scene::ValidationFailure;
+    }
+}
diff --git a/src/scene-bump.cpp b/src/scene-bump.cpp
new file mode 100644
index 0000000..2b6c01f
--- /dev/null
+++ b/src/scene-bump.cpp
@@ -0,0 +1,414 @@
+/*
+ * Copyright © 2010-2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis (glmark2)
+ *  Jesse Barker (glmark2)
+ */
+#include "scene.h"
+#include "log.h"
+#include "mat.h"
+#include "stack.h"
+#include "shader-source.h"
+#include "model.h"
+#include "texture.h"
+#include "util.h"
+#include <cmath>
+
+SceneBump::SceneBump(Canvas &pCanvas) :
+    Scene(pCanvas, "bump"),
+    texture_(0), rotation_(0.0f), rotationSpeed_(0.0f)
+{
+    options_["bump-render"] = Scene::Option("bump-render", "off",
+                                            "How to render bumps",
+                                            "off,normals,normals-tangent,height,high-poly");
+}
+
+SceneBump::~SceneBump()
+{
+}
+
+bool
+SceneBump::load()
+{
+    rotationSpeed_ = 36.0f;
+
+    running_ = false;
+
+    return true;
+}
+
+void
+SceneBump::unload()
+{
+}
+
+bool
+SceneBump::setup_model_plain(const std::string &type)
+{
+    static const std::string vtx_shader_filename(GLMARK_DATA_PATH"/shaders/bump-poly.vert");
+    static const std::string frg_shader_filename(GLMARK_DATA_PATH"/shaders/bump-poly.frag");
+    static const std::string low_poly_filename("asteroid-low");
+    static const std::string high_poly_filename("asteroid-high");
+    static const LibMatrix::vec4 lightPosition(20.0f, 20.0f, 10.0f, 1.0f);
+    Model model;
+
+    /* Calculate the half vector */
+    LibMatrix::vec3 halfVector(lightPosition.x(), lightPosition.y(), lightPosition.z());
+    halfVector.normalize();
+    halfVector += LibMatrix::vec3(0.0, 0.0, 1.0);
+    halfVector.normalize();
+
+    std::string poly_filename = type == "high-poly" ?
+                                high_poly_filename : low_poly_filename;
+
+    if(!model.load(poly_filename))
+        return false;
+
+    model.calculate_normals();
+
+    /* Tell the converter that we only care about position and normal attributes */
+    std::vector<std::pair<Model::AttribType, int> > attribs;
+    attribs.push_back(std::pair<Model::AttribType, int>(Model::AttribTypePosition, 3));
+    attribs.push_back(std::pair<Model::AttribType, int>(Model::AttribTypeNormal, 3));
+
+    model.convert_to_mesh(mesh_, attribs);
+
+    /* Load shaders */
+    ShaderSource vtx_source(vtx_shader_filename);
+    ShaderSource frg_source(frg_shader_filename);
+
+    /* Add constants to shaders */
+    frg_source.add_const("LightSourcePosition", lightPosition);
+    frg_source.add_const("LightSourceHalfVector", halfVector);
+
+    if (!Scene::load_shaders_from_strings(program_, vtx_source.str(),
+                                          frg_source.str()))
+    {
+        return false;
+    }
+
+    std::vector<GLint> attrib_locations;
+    attrib_locations.push_back(program_["position"].location());
+    attrib_locations.push_back(program_["normal"].location());
+    mesh_.set_attrib_locations(attrib_locations);
+
+    return true;
+}
+
+bool
+SceneBump::setup_model_normals()
+{
+    static const std::string vtx_shader_filename(GLMARK_DATA_PATH"/shaders/bump-normals.vert");
+    static const std::string frg_shader_filename(GLMARK_DATA_PATH"/shaders/bump-normals.frag");
+    static const LibMatrix::vec4 lightPosition(20.0f, 20.0f, 10.0f, 1.0f);
+    Model model;
+
+    if(!model.load("asteroid-low"))
+        return false;
+
+    /* Calculate the half vector */
+    LibMatrix::vec3 halfVector(lightPosition.x(), lightPosition.y(), lightPosition.z());
+    halfVector.normalize();
+    halfVector += LibMatrix::vec3(0.0, 0.0, 1.0);
+    halfVector.normalize();
+
+    /*
+     * We don't care about the vertex normals. We are using a per-fragment
+     * normal map (in object space coordinates).
+     */
+    std::vector<std::pair<Model::AttribType, int> > attribs;
+    attribs.push_back(std::pair<Model::AttribType, int>(Model::AttribTypePosition, 3));
+    attribs.push_back(std::pair<Model::AttribType, int>(Model::AttribTypeTexcoord, 2));
+
+    model.convert_to_mesh(mesh_, attribs);
+
+    /* Load shaders */
+    ShaderSource vtx_source(vtx_shader_filename);
+    ShaderSource frg_source(frg_shader_filename);
+
+    /* Add constants to shaders */
+    frg_source.add_const("LightSourcePosition", lightPosition);
+    frg_source.add_const("LightSourceHalfVector", halfVector);
+
+    if (!Scene::load_shaders_from_strings(program_, vtx_source.str(),
+                                          frg_source.str()))
+    {
+        return false;
+    }
+
+    std::vector<GLint> attrib_locations;
+    attrib_locations.push_back(program_["position"].location());
+    attrib_locations.push_back(program_["texcoord"].location());
+    mesh_.set_attrib_locations(attrib_locations);
+
+    if (!Texture::load("asteroid-normal-map", &texture_,
+                       GL_NEAREST, GL_NEAREST, 0))
+    {
+        return false;
+    }
+
+    return true;
+}
+
+bool
+SceneBump::setup_model_normals_tangent()
+{
+    static const std::string vtx_shader_filename(GLMARK_DATA_PATH"/shaders/bump-normals-tangent.vert");
+    static const std::string frg_shader_filename(GLMARK_DATA_PATH"/shaders/bump-normals-tangent.frag");
+    static const LibMatrix::vec4 lightPosition(20.0f, 20.0f, 10.0f, 1.0f);
+    Model model;
+
+    if(!model.load("asteroid-low"))
+        return false;
+
+    model.calculate_normals();
+
+    /* Calculate the half vector */
+    LibMatrix::vec3 halfVector(lightPosition.x(), lightPosition.y(), lightPosition.z());
+    halfVector.normalize();
+    halfVector += LibMatrix::vec3(0.0, 0.0, 1.0);
+    halfVector.normalize();
+
+    std::vector<std::pair<Model::AttribType, int> > attribs;
+    attribs.push_back(std::pair<Model::AttribType, int>(Model::AttribTypePosition, 3));
+    attribs.push_back(std::pair<Model::AttribType, int>(Model::AttribTypeNormal, 3));
+    attribs.push_back(std::pair<Model::AttribType, int>(Model::AttribTypeTexcoord, 2));
+    attribs.push_back(std::pair<Model::AttribType, int>(Model::AttribTypeTangent, 3));
+
+    model.convert_to_mesh(mesh_, attribs);
+
+    /* Load shaders */
+    ShaderSource vtx_source(vtx_shader_filename);
+    ShaderSource frg_source(frg_shader_filename);
+
+    /* Add constants to shaders */
+    frg_source.add_const("LightSourcePosition", lightPosition);
+    frg_source.add_const("LightSourceHalfVector", halfVector);
+
+    if (!Scene::load_shaders_from_strings(program_, vtx_source.str(),
+                                          frg_source.str()))
+    {
+        return false;
+    }
+
+    std::vector<GLint> attrib_locations;
+    attrib_locations.push_back(program_["position"].location());
+    attrib_locations.push_back(program_["normal"].location());
+    attrib_locations.push_back(program_["texcoord"].location());
+    attrib_locations.push_back(program_["tangent"].location());
+    mesh_.set_attrib_locations(attrib_locations);
+
+    if (!Texture::load("asteroid-normal-map-tangent", &texture_,
+                       GL_NEAREST, GL_NEAREST, 0))
+    {
+        return false;
+    }
+
+    return true;
+}
+
+bool
+SceneBump::setup_model_height()
+{
+    static const std::string vtx_shader_filename(GLMARK_DATA_PATH"/shaders/bump-height.vert");
+    static const std::string frg_shader_filename(GLMARK_DATA_PATH"/shaders/bump-height.frag");
+    static const LibMatrix::vec4 lightPosition(20.0f, 20.0f, 10.0f, 1.0f);
+    Model model;
+
+    if(!model.load("asteroid-low"))
+        return false;
+
+    model.calculate_normals();
+
+    /* Calculate the half vector */
+    LibMatrix::vec3 halfVector(lightPosition.x(), lightPosition.y(), lightPosition.z());
+    halfVector.normalize();
+    halfVector += LibMatrix::vec3(0.0, 0.0, 1.0);
+    halfVector.normalize();
+
+    std::vector<std::pair<Model::AttribType, int> > attribs;
+    attribs.push_back(std::pair<Model::AttribType, int>(Model::AttribTypePosition, 3));
+    attribs.push_back(std::pair<Model::AttribType, int>(Model::AttribTypeNormal, 3));
+    attribs.push_back(std::pair<Model::AttribType, int>(Model::AttribTypeTexcoord, 2));
+    attribs.push_back(std::pair<Model::AttribType, int>(Model::AttribTypeTangent, 3));
+
+    model.convert_to_mesh(mesh_, attribs);
+
+    /* Load shaders */
+    ShaderSource vtx_source(vtx_shader_filename);
+    ShaderSource frg_source(frg_shader_filename);
+
+    /* Add constants to shaders */
+    frg_source.add_const("LightSourcePosition", lightPosition);
+    frg_source.add_const("LightSourceHalfVector", halfVector);
+    frg_source.add_const("TextureStepX", 1.0 / 1024.0);
+    frg_source.add_const("TextureStepY", 1.0 / 1024.0);
+
+    if (!Scene::load_shaders_from_strings(program_, vtx_source.str(),
+                                          frg_source.str()))
+    {
+        return false;
+    }
+
+    std::vector<GLint> attrib_locations;
+    attrib_locations.push_back(program_["position"].location());
+    attrib_locations.push_back(program_["normal"].location());
+    attrib_locations.push_back(program_["texcoord"].location());
+    attrib_locations.push_back(program_["tangent"].location());
+    mesh_.set_attrib_locations(attrib_locations);
+
+    if (!Texture::load("asteroid-height-map", &texture_,
+                       GL_NEAREST, GL_NEAREST, 0))
+    {
+        return false;
+    }
+
+    return true;
+}
+
+bool
+SceneBump::setup()
+{
+    if (!Scene::setup())
+        return false;
+
+    const std::string &bump_render = options_["bump-render"].value;
+    Texture::find_textures();
+    Model::find_models();
+
+    bool setup_succeeded = false;
+
+    if (bump_render == "normals")
+        setup_succeeded = setup_model_normals();
+    else if (bump_render == "normals-tangent")
+        setup_succeeded = setup_model_normals_tangent();
+    else if (bump_render == "height")
+        setup_succeeded = setup_model_height();
+    else if (bump_render == "off" || bump_render == "high-poly")
+        setup_succeeded = setup_model_plain(bump_render);
+
+    if (!setup_succeeded)
+        return false;
+
+    mesh_.build_vbo();
+
+    program_.start();
+
+    // Load texture sampler value
+    program_["NormalMap"] = 0;
+    program_["HeightMap"] = 0;
+
+    currentFrame_ = 0;
+    rotation_ = 0.0;
+    running_ = true;
+    startTime_ = Util::get_timestamp_us() / 1000000.0;
+    lastUpdateTime_ = startTime_;
+
+    return true;
+}
+
+void
+SceneBump::teardown()
+{
+    mesh_.reset();
+
+    program_.stop();
+    program_.release();
+
+    glDeleteTextures(1, &texture_);
+    texture_ = 0;
+
+    Scene::teardown();
+}
+
+void
+SceneBump::update()
+{
+    Scene::update();
+
+    double elapsed_time = lastUpdateTime_ - startTime_;
+
+    rotation_ = rotationSpeed_ * elapsed_time;
+}
+
+void
+SceneBump::draw()
+{
+    LibMatrix::Stack4 model_view;
+
+    // Load the ModelViewProjectionMatrix uniform in the shader
+    LibMatrix::mat4 model_view_proj(canvas_.projection());
+
+    model_view.translate(0.0f, 0.0f, -3.5f);
+    model_view.rotate(rotation_, 0.0f, 1.0f, 0.0f);
+    model_view_proj *= model_view.getCurrent();
+
+    program_["ModelViewProjectionMatrix"] = model_view_proj;
+
+    // Load the NormalMatrix uniform in the shader. The NormalMatrix is the
+    // inverse transpose of the model view matrix.
+    LibMatrix::mat4 normal_matrix(model_view.getCurrent());
+    normal_matrix.inverse().transpose();
+    program_["NormalMatrix"] = normal_matrix;
+
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, texture_);
+
+    mesh_.render_vbo();
+}
+
+Scene::ValidationResult
+SceneBump::validate()
+{
+    static const double radius_3d(std::sqrt(3.0));
+
+    if (rotation_ != 0)
+        return Scene::ValidationUnknown;
+
+    Canvas::Pixel ref;
+
+    Canvas::Pixel pixel = canvas_.read_pixel(canvas_.width() / 2,
+                                             canvas_.height() / 2);
+
+    const std::string &bump_render = options_["bump-render"].value;
+
+    if (bump_render == "off")
+        ref = Canvas::Pixel(0x81, 0x81, 0x81, 0xff);
+    else if (bump_render == "high-poly")
+        ref = Canvas::Pixel(0x9c, 0x9c, 0x9c, 0xff);
+    else if (bump_render == "normals")
+        ref = Canvas::Pixel(0xa4, 0xa4, 0xa4, 0xff);
+    else if (bump_render == "normals-tangent")
+        ref = Canvas::Pixel(0x99, 0x99, 0x99, 0xff);
+    else if (bump_render == "height")
+        ref = Canvas::Pixel(0x9d, 0x9d, 0x9d, 0xff);
+    else
+        return Scene::ValidationUnknown;
+
+    double dist = pixel.distance_rgb(ref);
+
+    if (dist < radius_3d + 0.01) {
+        return Scene::ValidationSuccess;
+    }
+    else {
+        Log::debug("Validation failed! Expected: 0x%x Actual: 0x%x Distance: %f\n",
+                    ref.to_le32(), pixel.to_le32(), dist);
+        return Scene::ValidationFailure;
+    }
+}
diff --git a/src/scene-conditionals.cpp b/src/scene-conditionals.cpp
new file mode 100644
index 0000000..778cb33
--- /dev/null
+++ b/src/scene-conditionals.cpp
@@ -0,0 +1,156 @@
+/*
+ * Copyright © 2010-2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis (glmark2)
+ */
+#include "scene.h"
+#include "mat.h"
+#include "stack.h"
+#include "vec.h"
+#include "log.h"
+#include "shader-source.h"
+#include "util.h"
+
+#include <cmath>
+
+static const std::string shader_file_base(GLMARK_DATA_PATH"/shaders/conditionals");
+
+static const std::string vtx_file(shader_file_base + ".vert");
+static const std::string frg_file(shader_file_base + ".frag");
+static const std::string step_conditional_file(shader_file_base + "-step-conditional.all");
+static const std::string step_simple_file(shader_file_base + "-step-simple.all");
+
+SceneConditionals::SceneConditionals(Canvas &pCanvas) :
+    SceneGrid(pCanvas, "conditionals")
+{
+    options_["fragment-steps"] = Scene::Option("fragment-steps", "1",
+            "The number of computational steps in the fragment shader");
+    options_["fragment-conditionals"] = Scene::Option("fragment-conditionals", "true",
+            "Whether each computational step includes an if-else clause", "false,true");
+    options_["vertex-steps"] = Scene::Option("vertex-steps", "1",
+            "The number of computational steps in the vertex shader");
+    options_["vertex-conditionals"] = Scene::Option("vertex-conditionals", "true",
+            "Whether each computational step includes an if-else clause", "false,true");
+}
+
+SceneConditionals::~SceneConditionals()
+{
+}
+
+static std::string
+get_vertex_shader_source(int steps, bool conditionals)
+{
+    ShaderSource source(vtx_file);
+    ShaderSource source_main;
+
+    for (int i = 0; i < steps; i++) {
+        if (conditionals)
+            source_main.append_file(step_conditional_file);
+        else
+            source_main.append_file(step_simple_file);
+    }
+
+    source.replace("$MAIN$", source_main.str());
+
+    return source.str();
+}
+
+static std::string
+get_fragment_shader_source(int steps, bool conditionals)
+{
+    ShaderSource source(frg_file);
+    ShaderSource source_main;
+
+    for (int i = 0; i < steps; i++) {
+        if (conditionals)
+            source_main.append_file(step_conditional_file);
+        else
+            source_main.append_file(step_simple_file);
+    }
+
+    source.replace("$MAIN$", source_main.str());
+
+    return source.str();
+}
+
+bool
+SceneConditionals::setup()
+{
+    if (!SceneGrid::setup())
+        return false;
+
+    /* Parse options */
+    bool vtx_conditionals = options_["vertex-conditionals"].value == "true";
+    bool frg_conditionals = options_["fragment-conditionals"].value == "true";
+    int vtx_steps(Util::fromString<int>(options_["vertex-steps"].value));
+    int frg_steps(Util::fromString<int>(options_["fragment-steps"].value));
+    /* Load shaders */
+    std::string vtx_shader(get_vertex_shader_source(vtx_steps, vtx_conditionals));
+    std::string frg_shader(get_fragment_shader_source(frg_steps, frg_conditionals));
+
+    if (!Scene::load_shaders_from_strings(program_, vtx_shader, frg_shader))
+        return false;
+
+    program_.start();
+
+    std::vector<GLint> attrib_locations;
+    attrib_locations.push_back(program_["position"].location());
+    mesh_.set_attrib_locations(attrib_locations);
+
+    running_ = true;
+    startTime_ = Util::get_timestamp_us() / 1000000.0;
+    lastUpdateTime_ = startTime_;
+
+    return true;
+}
+
+Scene::ValidationResult
+SceneConditionals::validate()
+{
+    static const double radius_3d(std::sqrt(3.0 * 5.0 * 5.0));
+
+    bool frg_conditionals = options_["fragment-conditionals"].value == "true";
+    int frg_steps(Util::fromString<int>(options_["fragment-steps"].value));
+
+    if (!frg_conditionals)
+        return Scene::ValidationUnknown;
+
+    Canvas::Pixel ref;
+
+    if (frg_steps == 0)
+        ref = Canvas::Pixel(0xa0, 0xa0, 0xa0, 0xff);
+    else if (frg_steps == 5)
+        ref = Canvas::Pixel(0x25, 0x25, 0x25, 0xff);
+    else
+        return Scene::ValidationUnknown;
+
+    Canvas::Pixel pixel = canvas_.read_pixel(293, 89);
+
+    double dist = pixel.distance_rgb(ref);
+    if (dist < radius_3d + 0.01) {
+        return Scene::ValidationSuccess;
+    }
+    else {
+        Log::debug("Validation failed! Expected: 0x%x Actual: 0x%x Distance: %f\n",
+                    ref.to_le32(), pixel.to_le32(), dist);
+        return Scene::ValidationFailure;
+    }
+
+    return Scene::ValidationUnknown;
+}
diff --git a/src/scene-default-options.cpp b/src/scene-default-options.cpp
new file mode 100644
index 0000000..0cc8c89
--- /dev/null
+++ b/src/scene-default-options.cpp
@@ -0,0 +1,62 @@
+/*
+ * Copyright © 2010-2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis (glmark2)
+ */
+#include "scene.h"
+#include "benchmark.h"
+#include "log.h"
+
+bool
+SceneDefaultOptions::setup()
+{
+    const std::map<std::string, Scene *> &scenes = Benchmark::scenes();
+
+    for (std::list<std::pair<std::string, std::string> >::const_iterator iter = defaultOptions_.begin();
+         iter != defaultOptions_.end();
+         iter++)
+    {
+        for (std::map<std::string, Scene *>::const_iterator scene_iter = scenes.begin();
+             scene_iter != scenes.end();
+             scene_iter++)
+        {
+            Scene &scene(*(scene_iter->second));
+
+            /* 
+             * Display warning only if the option value is unsupported, not if
+             * the scene doesn't support the option at all.
+             */
+            if (!scene.set_option_default(iter->first, iter->second) &&
+                scene.options().find(iter->first) != scene.options().end())
+            {
+                Log::info("Warning: Scene '%s' doesn't accept default value '%s' for option '%s'\n",
+                          scene.name().c_str(), iter->second.c_str(), iter->first.c_str());
+            }
+        }
+    }
+
+    return true;
+}
+
+bool
+SceneDefaultOptions::set_option(const std::string &opt, const std::string &val)
+{
+    defaultOptions_.push_back(std::pair<std::string, std::string>(opt, val));
+    return true;
+}
diff --git a/src/scene-desktop.cpp b/src/scene-desktop.cpp
new file mode 100644
index 0000000..b1431f8
--- /dev/null
+++ b/src/scene-desktop.cpp
@@ -0,0 +1,1017 @@
+/*
+ * Copyright © 2010-2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis (glmark2)
+ *  Jesse Barker (glmark2)
+ */
+#include <cmath>
+#include <cstdlib>
+
+#include "scene.h"
+#include "mat.h"
+#include "stack.h"
+#include "vec.h"
+#include "log.h"
+#include "program.h"
+#include "shader-source.h"
+#include "util.h"
+#include "texture.h"
+
+enum BlurDirection {
+    BlurDirectionHorizontal,
+    BlurDirectionVertical,
+    BlurDirectionBoth
+};
+
+static void
+create_blur_shaders(ShaderSource& vtx_source, ShaderSource& frg_source,
+                    unsigned int radius, float sigma, BlurDirection direction)
+{
+    vtx_source.append_file(GLMARK_DATA_PATH"/shaders/desktop.vert");
+    frg_source.append_file(GLMARK_DATA_PATH"/shaders/desktop-blur.frag");
+
+    /* Don't let the gaussian curve become too narrow */
+    if (sigma < 1.0)
+        sigma = 1.0;
+
+    unsigned int side = 2 * radius + 1;
+
+    for (unsigned int i = 0; i < radius + 1; i++) {
+        float s2 = 2.0 * sigma * sigma;
+        float k = 1.0 / std::sqrt(M_PI * s2) * std::exp( - (static_cast<float>(i) * i) / s2);
+        std::stringstream ss_tmp;
+        ss_tmp << "Kernel" << i;
+        frg_source.add_const(ss_tmp.str(), k);
+    }
+
+    std::stringstream ss;
+    ss << "result = " << std::endl;
+
+    if (direction == BlurDirectionHorizontal) {
+        for (unsigned int i = 0; i < side; i++) {
+            int offset = static_cast<int>(i - radius);
+            ss << "texture2D(Texture0, TextureCoord + vec2(" <<
+                  offset << ".0 * TextureStepX, 0.0)) * Kernel" <<
+                  std::abs(offset) << " +" << std::endl;
+        }
+        ss << "0.0 ;" << std::endl;
+    }
+    else if (direction == BlurDirectionVertical) {
+        for (unsigned int i = 0; i < side; i++) {
+            int offset = static_cast<int>(i - radius);
+            ss << "texture2D(Texture0, TextureCoord + vec2(0.0, " <<
+                  offset << ".0 * TextureStepY)) * Kernel" <<
+                  std::abs(offset) << " +" << std::endl;
+        }
+        ss << "0.0 ;" << std::endl;
+    }
+    else if (direction == BlurDirectionBoth) {
+        for (unsigned int i = 0; i < side; i++) {
+            int ioffset = static_cast<int>(i - radius);
+            for (unsigned int j = 0; j < side; j++) {
+                int joffset = static_cast<int>(j - radius);
+                ss << "texture2D(Texture0, TextureCoord + vec2(" <<
+                      ioffset << ".0 * TextureStepX, " <<
+                      joffset << ".0 * TextureStepY))" <<
+                      " * Kernel" << std::abs(ioffset) <<
+                      " * Kernel" << std::abs(joffset) << " +" << std::endl;
+            }
+        }
+        ss << " 0.0;" << std::endl;
+    }
+
+    frg_source.replace("$CONVOLUTION$", ss.str());
+}
+
+/**
+ * A RenderObject represents a source and target of rendering
+ * operations.
+ */
+class RenderObject
+{
+public:
+    RenderObject() :
+        texture_(0), fbo_(0), rotation_rad_(0),
+        texture_contents_invalid_(true) { }
+
+    virtual ~RenderObject() {}
+
+    virtual void init()
+    {
+        /* Create a texture to draw to */
+        glGenTextures(1, &texture_);
+        glBindTexture(GL_TEXTURE_2D, texture_);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, size_.x(), size_.y(), 0,
+                     GL_RGBA, GL_UNSIGNED_BYTE, 0);
+
+        /* Create a FBO */
+        glGenFramebuffers(1, &fbo_);
+        glBindFramebuffer(GL_FRAMEBUFFER, fbo_);
+        glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+                               GL_TEXTURE_2D, texture_, 0);
+
+        glBindFramebuffer(GL_FRAMEBUFFER, 0);
+
+        /* Load the shader program when this class if first used */
+        if (RenderObject::use_count == 0) {
+            ShaderSource vtx_source(GLMARK_DATA_PATH"/shaders/desktop.vert");
+            ShaderSource frg_source(GLMARK_DATA_PATH"/shaders/desktop.frag");
+            Scene::load_shaders_from_strings(main_program, vtx_source.str(),
+                                             frg_source.str());
+        }
+
+        texture_contents_invalid_ = true;
+        RenderObject::use_count++;
+    }
+
+    virtual void release()
+    {
+        /* Release resources */
+        if (texture_ != 0)
+        {
+            glDeleteTextures(1, &texture_);
+            texture_ = 0;
+        }
+        if (fbo_ != 0)
+        {
+            glDeleteFramebuffers(1, &fbo_);
+            fbo_ = 0;
+        }
+
+        /*
+         * Release the shader program when object of this class
+         * are no longer in use.
+         */
+        RenderObject::use_count--;
+        if (RenderObject::use_count == 0)
+            RenderObject::main_program.release();
+    }
+
+    void make_current()
+    {
+        glBindFramebuffer(GL_FRAMEBUFFER, fbo_);
+        glViewport(0, 0, size_.x(), size_.y());
+    }
+
+    void position(const LibMatrix::vec2& pos) { pos_ = pos; }
+    const LibMatrix::vec2& position() { return pos_; }
+
+
+    virtual void size(const LibMatrix::vec2& size)
+    {
+        /* Recreate the backing texture with correct size */
+        if (size_.x() != size.x() || size_.y() != size.y()) {
+            size_ = size;
+            glBindTexture(GL_TEXTURE_2D, texture_);
+            glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, size_.x(), size_.y(), 0,
+                         GL_RGBA, GL_UNSIGNED_BYTE, 0);
+            texture_contents_invalid_ = true;
+        }
+
+        if (texture_contents_invalid_) {
+            clear();
+            texture_contents_invalid_ = false;
+        }
+    }
+
+    const LibMatrix::vec2& size() { return size_; }
+
+    const LibMatrix::vec2& speed() { return speed_; }
+    void speed(const LibMatrix::vec2& speed) { speed_ = speed; }
+
+    GLuint texture() { return texture_; }
+
+    virtual void clear()
+    {
+        make_current();
+        glClear(GL_COLOR_BUFFER_BIT);
+    }
+
+    virtual void render_to(RenderObject& target)
+    {
+        render_to(target, main_program);
+    }
+
+    virtual void render_to(RenderObject& target, Program& program)
+    {
+        LibMatrix::vec2 anchor(pos_);
+        LibMatrix::vec2 ll(pos_ - anchor);
+        LibMatrix::vec2 ur(pos_ + size_ - anchor);
+
+        /* Calculate new position according to rotation value */
+        GLfloat position[2 * 4] = {
+            rotate_x(ll.x(), ll.y()) + anchor.x(), rotate_y(ll.x(), ll.y()) + anchor.y(),
+            rotate_x(ur.x(), ll.y()) + anchor.x(), rotate_y(ur.x(), ll.y()) + anchor.y(),
+            rotate_x(ll.x(), ur.y()) + anchor.x(), rotate_y(ll.x(), ur.y()) + anchor.y(),
+            rotate_x(ur.x(), ur.y()) + anchor.x(), rotate_y(ur.x(), ur.y()) + anchor.y(),
+        };
+
+        /* Normalize position and write back to array */
+        for (int i = 0; i < 4; i++) {
+            const LibMatrix::vec2& v2(
+                    target.normalize_position(
+                        LibMatrix::vec2(position[2 * i], position[2 * i + 1])
+                        )
+                    );
+            position[2 * i] = v2.x();
+            position[2 * i + 1] = v2.y();
+        }
+
+        static const GLfloat texcoord[2 * 4] = {
+            0.0, 0.0,
+            1.0, 0.0,
+            0.0, 1.0,
+            1.0, 1.0,
+        };
+
+        target.make_current();
+
+        glActiveTexture(GL_TEXTURE0);
+        glBindTexture(GL_TEXTURE_2D, texture_);
+        draw_quad_with_program(position, texcoord, program);
+    }
+
+    virtual void render_from(RenderObject& target, Program& program = main_program)
+    {
+        LibMatrix::vec2 final_pos(pos_ + size_);
+        LibMatrix::vec2 ll_tex(target.normalize_texcoord(pos_));
+        LibMatrix::vec2 ur_tex(target.normalize_texcoord(final_pos));
+
+        static const GLfloat position_blur[2 * 4] = {
+            -1.0, -1.0,
+             1.0, -1.0,
+            -1.0,  1.0,
+             1.0,  1.0,
+        };
+        GLfloat texcoord_blur[2 * 4] = {
+            ll_tex.x(), ll_tex.y(),
+            ur_tex.x(), ll_tex.y(),
+            ll_tex.x(), ur_tex.y(),
+            ur_tex.x(), ur_tex.y(),
+        };
+
+        make_current();
+        glBindTexture(GL_TEXTURE_2D, target.texture());
+        draw_quad_with_program(position_blur, texcoord_blur, program);
+    }
+
+    /**
+     * Normalizes a position from [0, size] to [-1.0, 1.0]
+     */
+    LibMatrix::vec2 normalize_position(const LibMatrix::vec2& pos)
+    {
+        return pos * 2.0 / size_ - 1.0;
+    }
+
+    /**
+     * Normalizes a position from [0, size] to [0.0, 1.0]
+     */
+    LibMatrix::vec2 normalize_texcoord(const LibMatrix::vec2& pos)
+    {
+        return pos / size_;
+    }
+
+    void rotation(float degrees)
+    {
+        rotation_rad_ = (M_PI * degrees / 180.0);
+    }
+
+protected:
+    void draw_quad_with_program(const GLfloat *position, const GLfloat *texcoord,
+                                Program &program)
+    {
+        int pos_index = program["position"].location();
+        int tex_index = program["texcoord"].location();
+
+        program.start();
+
+        glEnableVertexAttribArray(pos_index);
+        glEnableVertexAttribArray(tex_index);
+        glVertexAttribPointer(pos_index, 2,
+                              GL_FLOAT, GL_FALSE, 0, position);
+        glVertexAttribPointer(tex_index, 2,
+                              GL_FLOAT, GL_FALSE, 0, texcoord);
+
+        glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+
+        glDisableVertexAttribArray(tex_index);
+        glDisableVertexAttribArray(pos_index);
+
+        program.stop();
+    }
+
+    static Program main_program;
+
+    LibMatrix::vec2 pos_;
+    LibMatrix::vec2 size_;
+    LibMatrix::vec2 speed_;
+    GLuint texture_;
+    GLuint fbo_;
+
+private:
+    float rotate_x(float x, float y)
+    {
+        return x * cos(rotation_rad_) - y * sin(rotation_rad_);
+    }
+
+    float rotate_y(float x, float y)
+    {
+        return x * sin(rotation_rad_) + y * cos(rotation_rad_);
+    }
+
+    float rotation_rad_;
+    bool texture_contents_invalid_;
+    static int use_count;
+
+};
+
+int RenderObject::use_count = 0;
+Program RenderObject::main_program;
+
+/**
+ * A RenderObject representing the screen.
+ *
+ * Rendering to this objects renders to the screen framebuffer.
+ */
+class RenderScreen : public RenderObject
+{
+public:
+    RenderScreen(Canvas &canvas) { fbo_ = canvas.fbo(); }
+    virtual void init() {}
+    virtual void release() {}
+};
+
+/**
+ * A RenderObject with a background image.
+ *
+ * The image is drawn to the RenderObject automatically when the
+ * object is cleared, resized etc
+ */
+class RenderClearImage : public RenderObject
+{
+public:
+    RenderClearImage(const std::string& texture) :
+        RenderObject(), background_texture_name(texture),
+        background_texture_(0) {}
+
+    virtual void init()
+    {
+        RenderObject::init();
+
+        /* Load the image into a texture */
+        Texture::load(background_texture_name,
+                      &background_texture_, GL_LINEAR, GL_LINEAR, 0);
+
+    }
+
+    virtual void release()
+    {
+        glDeleteTextures(1, &background_texture_);
+        background_texture_ = 0;
+
+        RenderObject::release();
+    }
+
+    virtual void clear()
+    {
+        static const GLfloat position[2 * 4] = {
+            -1.0, -1.0,
+             1.0, -1.0,
+            -1.0,  1.0,
+             1.0,  1.0,
+        };
+        static const GLfloat texcoord[2 * 4] = {
+            0.0, 0.0,
+            1.0, 0.0,
+            0.0, 1.0,
+            1.0, 1.0,
+        };
+
+        make_current();
+        glClear(GL_COLOR_BUFFER_BIT);
+
+        glActiveTexture(GL_TEXTURE0);
+        glBindTexture(GL_TEXTURE_2D, background_texture_);
+
+        glEnable(GL_BLEND);
+        glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+        draw_quad_with_program(position, texcoord, main_program);
+        glDisable(GL_BLEND);
+    }
+
+private:
+    std::string background_texture_name;
+    GLuint background_texture_;
+};
+
+/**
+ * A RenderObject that blurs the target it is drawn to.
+ */
+class RenderWindowBlur : public RenderObject
+{
+public:
+    RenderWindowBlur(unsigned int passes, unsigned int radius, bool separable,
+                     bool draw_contents = true) :
+        RenderObject(), passes_(passes), radius_(radius), separable_(separable),
+        draw_contents_(draw_contents) {}
+
+    virtual void init()
+    {
+        RenderObject::init();
+
+        /* Only have one instance of the window contents data */
+        if (draw_contents_ && RenderWindowBlur::use_count == 0)
+            window_contents_.init();
+
+        RenderWindowBlur::use_count++;
+    }
+
+    virtual void release()
+    {
+        RenderWindowBlur::use_count--;
+
+        /* Only have one instance of the window contents data */
+        if (draw_contents_ && RenderWindowBlur::use_count == 0)
+            window_contents_.release();
+
+        RenderObject::release();
+    }
+
+    virtual void size(const LibMatrix::vec2& size)
+    {
+        RenderObject::size(size);
+        if (draw_contents_)
+            window_contents_.size(size);
+    }
+
+    virtual void render_to(RenderObject& target)
+    {
+        if (separable_) {
+            Program& blur_program_h1 = blur_program_h(target.size().x());
+            Program& blur_program_v1 = blur_program_v(target.size().y());
+
+            for (unsigned int i = 0; i < passes_; i++) {
+                render_from(target, blur_program_h1);
+                RenderObject::render_to(target, blur_program_v1);
+            }
+        }
+        else {
+            Program& blur_program1 = blur_program(target.size().x(), target.size().y());
+
+            for (unsigned int i = 0; i < passes_; i++) {
+                if (i % 2 == 0)
+                    render_from(target, blur_program1);
+                else
+                    RenderObject::render_to(target, blur_program1);
+            }
+
+            if (passes_ % 2 == 1)
+                RenderObject::render_to(target);
+        }
+
+        /*
+         * Blend the window contents with the target texture.
+         */
+        if (draw_contents_) {
+            glEnable(GL_BLEND);
+            /*
+             * Blend the colors normally, but don't change the
+             * destination alpha value.
+             */
+            glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA,
+                                GL_ZERO, GL_ONE);
+            window_contents_.position(position());
+            window_contents_.render_to(target);
+            glDisable(GL_BLEND);
+        }
+    }
+
+private:
+    Program& blur_program(unsigned int w, unsigned int h)
+    {
+        /*
+         * If the size of the window has changed we must recreate
+         * the shader to contain the correct texture step values.
+         */
+        if (blur_program_dim_.x() != w || blur_program_dim_.y() != h ||
+            !blur_program_.ready())
+        {
+            blur_program_dim_.x(w);
+            blur_program_dim_.y(h);
+
+            blur_program_.release();
+
+            ShaderSource vtx_source;
+            ShaderSource frg_source;
+            create_blur_shaders(vtx_source, frg_source, radius_,
+                                radius_ / 3.0, BlurDirectionBoth);
+            frg_source.add_const("TextureStepX", 1.0 / w);
+            frg_source.add_const("TextureStepY", 1.0 / h);
+            Scene::load_shaders_from_strings(blur_program_, vtx_source.str(),
+                                             frg_source.str());
+        }
+
+        return blur_program_;
+    }
+
+    Program& blur_program_h(unsigned int w)
+    {
+        /*
+         * If the size of the window has changed we must recreate
+         * the shader to contain the correct texture step values.
+         */
+        if (blur_program_dim_.x() != w ||
+            !blur_program_h_.ready())
+        {
+            blur_program_dim_.x(w);
+
+            blur_program_h_.release();
+
+            ShaderSource vtx_source;
+            ShaderSource frg_source;
+            create_blur_shaders(vtx_source, frg_source, radius_,
+                                radius_ / 3.0, BlurDirectionHorizontal);
+            frg_source.add_const("TextureStepX", 1.0 / w);
+            Scene::load_shaders_from_strings(blur_program_h_, vtx_source.str(),
+                                             frg_source.str());
+        }
+
+        return blur_program_h_;
+    }
+
+    Program& blur_program_v(unsigned int h)
+    {
+        /*
+         * If the size of the window has changed we must recreate
+         * the shader to contain the correct texture step values.
+         */
+        if (blur_program_dim_.y() != h ||
+            !blur_program_v_.ready())
+        {
+            blur_program_dim_.y(h);
+
+            blur_program_v_.release();
+
+            ShaderSource vtx_source;
+            ShaderSource frg_source;
+            create_blur_shaders(vtx_source, frg_source, radius_,
+                                radius_ / 3.0, BlurDirectionVertical);
+            frg_source.add_const("TextureStepY", 1.0 / h);
+            Scene::load_shaders_from_strings(blur_program_v_, vtx_source.str(),
+                                             frg_source.str());
+        }
+
+        return blur_program_v_;
+    }
+
+    LibMatrix::uvec2 blur_program_dim_;
+    Program blur_program_;
+    Program blur_program_h_;
+    Program blur_program_v_;
+    unsigned int passes_;
+    unsigned int radius_;
+    bool separable_;
+    bool draw_contents_;
+
+    static int use_count;
+    static RenderClearImage window_contents_;
+
+};
+
+/**
+ * A RenderObject that draws a drop shadow around the window.
+ */
+class RenderWindowShadow : public RenderObject
+{
+public:
+    using RenderObject::size;
+
+    RenderWindowShadow(unsigned int shadow_size, bool draw_contents = true) :
+        RenderObject(), shadow_size_(shadow_size), draw_contents_(draw_contents) {}
+
+    virtual void init()
+    {
+        RenderObject::init();
+
+        /*
+         * Only have one instance of the resources.
+         * This works only if all windows have the same size, which
+         * is currently the case for this scene. If this condition
+         * ceases to be true we will need to create the resources per
+         * object.
+         */
+        if (RenderWindowShadow::use_count == 0) {
+            shadow_h_.init();
+            shadow_v_.init();
+            shadow_corner_.init();
+            if (draw_contents_)
+                window_contents_.init();
+        }
+
+        RenderWindowShadow::use_count++;
+    }
+
+    virtual void release()
+    {
+        RenderWindowShadow::use_count--;
+
+        /* Only have one instance of the data */
+        if (RenderWindowShadow::use_count == 0) {
+            shadow_h_.release();
+            shadow_v_.release();
+            shadow_corner_.release();
+            if (draw_contents_)
+                window_contents_.release();
+        }
+
+        RenderObject::release();
+    }
+
+    virtual void size(const LibMatrix::vec2& size)
+    {
+        RenderObject::size(size);
+        shadow_h_.size(LibMatrix::vec2(size.x() - shadow_size_,
+                                       static_cast<double>(shadow_size_)));
+        shadow_v_.size(LibMatrix::vec2(size.y() - shadow_size_,
+                                       static_cast<double>(shadow_size_)));
+        shadow_corner_.size(LibMatrix::vec2(static_cast<double>(shadow_size_),
+                                            static_cast<double>(shadow_size_)));
+        if (draw_contents_)
+            window_contents_.size(size);
+    }
+
+    virtual void render_to(RenderObject& target)
+    {
+        glEnable(GL_BLEND);
+        /*
+         * Blend the colors normally, but don't change the
+         * destination alpha value.
+         */
+        glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA,
+                            GL_ZERO, GL_ONE);
+
+        /* Bottom shadow */
+        shadow_h_.rotation(0.0);
+        shadow_h_.position(position() +
+                           LibMatrix::vec2(shadow_size_,
+                                           -shadow_h_.size().y()));
+        shadow_h_.render_to(target);
+
+        /* Right shadow */
+        shadow_v_.rotation(90.0);
+        shadow_v_.position(position() +
+                           LibMatrix::vec2(size().x() + shadow_v_.size().y(), 0.0));
+        shadow_v_.render_to(target);
+
+        /* Bottom right shadow */
+        shadow_corner_.rotation(0.0);
+        shadow_corner_.position(position() +
+                                LibMatrix::vec2(size().x(),
+                                                -shadow_corner_.size().y()));
+        shadow_corner_.render_to(target);
+
+        /* Top right shadow */
+        shadow_corner_.rotation(90.0);
+        shadow_corner_.position(position() + size() +
+                                LibMatrix::vec2(shadow_corner_.size().x(),
+                                                -shadow_corner_.size().y()));
+        shadow_corner_.render_to(target);
+
+        /* Bottom left shadow */
+        shadow_corner_.rotation(-90.0);
+        shadow_corner_.position(position());
+        shadow_corner_.render_to(target);
+
+        /*
+         * Blend the window contents with the target texture.
+         */
+        if (draw_contents_) {
+            window_contents_.position(position());
+            window_contents_.render_to(target);
+        }
+
+        glDisable(GL_BLEND);
+    }
+
+private:
+    unsigned int shadow_size_;
+    bool draw_contents_;
+
+    static int use_count;
+    static RenderClearImage window_contents_;
+    static RenderClearImage shadow_h_;
+    static RenderClearImage shadow_v_;
+    static RenderClearImage shadow_corner_;
+
+};
+
+int RenderWindowBlur::use_count = 0;
+RenderClearImage RenderWindowBlur::window_contents_("desktop-window");
+int RenderWindowShadow::use_count = 0;
+RenderClearImage RenderWindowShadow::window_contents_("desktop-window");
+RenderClearImage RenderWindowShadow::shadow_h_("desktop-shadow");
+RenderClearImage RenderWindowShadow::shadow_v_("desktop-shadow");
+RenderClearImage RenderWindowShadow::shadow_corner_("desktop-shadow-corner");
+
+/*******************************
+ * SceneDesktop implementation *
+ *******************************/
+
+/**
+ * Private structure used to avoid contaminating scene.h with all of the
+ * SceneDesktop internal classes.
+ */
+struct SceneDesktopPrivate
+{
+    RenderScreen screen;
+    RenderClearImage desktop;
+    std::vector<RenderObject *> windows;
+
+    SceneDesktopPrivate(Canvas &canvas) :
+        screen(canvas), desktop("effect-2d") {}
+
+    ~SceneDesktopPrivate() { Util::dispose_pointer_vector(windows); }
+
+};
+
+
+SceneDesktop::SceneDesktop(Canvas &canvas) :
+    Scene(canvas, "desktop")
+{
+    priv_ = new SceneDesktopPrivate(canvas);
+    options_["effect"] = Scene::Option("effect", "blur", "The effect to use",
+                                       "blur,shadow");
+    options_["windows"] = Scene::Option("windows", "4",
+                                        "the number of windows");
+    options_["window-size"] = Scene::Option("window-size", "0.35",
+                                            "the window size as a percentage of the minimum screen dimension [0.0 - 0.5]");
+    options_["passes"] = Scene::Option("passes", "1",
+                                       "the number of effect passes (effect dependent)");
+    options_["blur-radius"] = Scene::Option("blur-radius", "5",
+                                            "the blur effect radius (in pixels)");
+    options_["separable"] = Scene::Option("separable", "true",
+                                          "use separable convolution for the blur effect",
+                                          "false,true");
+    options_["shadow-size"] = Scene::Option("shadow-size", "20",
+                                            "the size of the shadow (in pixels)");
+}
+
+SceneDesktop::~SceneDesktop()
+{
+    delete priv_;
+}
+
+bool
+SceneDesktop::load()
+{
+    return true;
+}
+
+void
+SceneDesktop::unload()
+{
+}
+
+bool
+SceneDesktop::setup()
+{
+    if (!Scene::setup())
+        return false;
+
+    /* Parse the options */
+    unsigned int windows(0);
+    unsigned int passes(0);
+    unsigned int blur_radius(0);
+    float window_size_factor(0.0);
+    unsigned int shadow_size(0);
+    bool separable(options_["separable"].value == "true");
+
+    windows = Util::fromString<unsigned int>(options_["windows"].value);
+    window_size_factor = Util::fromString<float>(options_["window-size"].value);
+    passes = Util::fromString<unsigned int>(options_["passes"].value);
+    blur_radius = Util::fromString<unsigned int>(options_["blur-radius"].value);
+    shadow_size = Util::fromString<unsigned int>(options_["shadow-size"].value);
+
+    // Make sure the Texture object knows where to find our images.
+    Texture::find_textures();
+
+    /* Ensure we get a transparent clear color for all following operations */
+    glClearColor(0.0, 0.0, 0.0, 0.0);
+    glDisable(GL_DEPTH_TEST);
+    glDepthMask(GL_FALSE);
+
+    /* Set up the screen and desktop RenderObjects */
+    priv_->screen.init();
+    priv_->desktop.init();
+    priv_->screen.size(LibMatrix::vec2(canvas_.width(), canvas_.height()));
+    priv_->desktop.size(LibMatrix::vec2(canvas_.width(), canvas_.height()));
+
+    /* Create the windows */
+    const float angular_step(2.0 * M_PI / windows);
+    unsigned int min_dimension = std::min(canvas_.width(), canvas_.height());
+    float window_size(min_dimension * window_size_factor);
+    static const LibMatrix::vec2 corner_offset(window_size / 2.0,
+                                               window_size / 2.0);
+
+    for (unsigned int i = 0; i < windows; i++) {
+        LibMatrix::vec2 center(canvas_.width() * (0.5 + 0.25 * cos(i * angular_step)),
+                               canvas_.height() * (0.5 + 0.25 * sin(i * angular_step)));
+        RenderObject* win;
+        if (options_["effect"].value == "shadow")
+            win = new RenderWindowShadow(shadow_size);
+        else
+            win = new RenderWindowBlur(passes, blur_radius, separable);
+
+        win->init();
+        win->position(center - corner_offset);
+        win->size(LibMatrix::vec2(window_size, window_size));
+        /*
+         * Set the speed in increments of about 30 degrees (but not exactly,
+         * so we don't get windows moving just on the X axis or Y axis).
+         */
+        win->speed(LibMatrix::vec2(cos(0.1 + i * M_PI / 6.0) * canvas_.width() / 3,
+                                   sin(0.1 + i * M_PI / 6.0) * canvas_.height() / 3));
+        /*
+         * Perform a dummy rendering to ensure internal shaders are initialized
+         * now, in order not to affect the benchmarking.
+         */
+        win->render_to(priv_->desktop);
+        priv_->windows.push_back(win);
+    }
+
+    /*
+     * Ensure the screen is the current rendering target (it might have changed
+     * to a FBO in the previous steps).
+     */
+    priv_->screen.make_current();
+
+    currentFrame_ = 0;
+    running_ = true;
+    startTime_ = Util::get_timestamp_us() / 1000000.0;
+    lastUpdateTime_ = startTime_;
+
+    return true;
+}
+
+void
+SceneDesktop::teardown()
+{
+    for (std::vector<RenderObject*>::iterator winIt = priv_->windows.begin();
+         winIt != priv_->windows.end();
+         winIt++)
+    {
+        RenderObject* curObj = *winIt;
+        curObj->release();
+        delete curObj;
+    }
+    priv_->windows.clear();
+    priv_->screen.make_current();
+
+    glEnable(GL_DEPTH_TEST);
+    glDepthMask(GL_TRUE);
+
+    priv_->desktop.release();
+    priv_->screen.release();
+
+    Scene::teardown();
+}
+
+void
+SceneDesktop::update()
+{
+    double current_time = Util::get_timestamp_us() / 1000000.0;
+    double dt = current_time - lastUpdateTime_;
+
+    Scene::update();
+
+    std::vector<RenderObject *>& windows(priv_->windows);
+
+    /*
+     * Move the windows around the screen, bouncing them back when
+     * they reach the edge.
+     */
+    for (std::vector<RenderObject *>::const_iterator iter = windows.begin();
+         iter != windows.end();
+         iter++)
+    {
+        bool should_update = true;
+        RenderObject *win = *iter;
+        LibMatrix::vec2 new_pos(
+                win->position().x() + win->speed().x() * dt,
+                win->position().y() + win->speed().y() * dt);
+
+        if (new_pos.x() < 0.0 ||
+            new_pos.x() + win->size().x() > static_cast<float>(canvas_.width()))
+        {
+            win->speed(LibMatrix::vec2(-win->speed().x(), win->speed().y()));
+            should_update = false;
+        }
+
+        if (new_pos.y() < 0.0 ||
+            new_pos.y() + win->size().y() > static_cast<float>(canvas_.height()))
+        {
+            win->speed(LibMatrix::vec2(win->speed().x(), -win->speed().y()));
+            should_update = false;
+        }
+
+        if (should_update)
+            win->position(new_pos);
+    }
+}
+
+void
+SceneDesktop::draw()
+{
+    std::vector<RenderObject *>& windows(priv_->windows);
+
+    /* Ensure we get a transparent clear color for all following operations */
+    glClearColor(0.0, 0.0, 0.0, 0.0);
+
+    priv_->desktop.clear();
+
+    for (std::vector<RenderObject *>::const_iterator iter = windows.begin();
+         iter != windows.end();
+         iter++)
+    {
+        RenderObject *win = *iter;
+        win->render_to(priv_->desktop);
+    }
+
+    priv_->desktop.render_to(priv_->screen);
+
+}
+
+Scene::ValidationResult
+SceneDesktop::validate()
+{
+    static const double radius_3d(std::sqrt(3.0 * 2.0 * 2.0));
+
+    Canvas::Pixel ref;
+
+    /* Parse the options */
+    unsigned int windows(0);
+    unsigned int passes(0);
+    unsigned int blur_radius(0);
+    float window_size_factor(0.0);
+    unsigned int shadow_size(0);
+
+    windows = Util::fromString<unsigned int>(options_["windows"].value);
+    window_size_factor = Util::fromString<float>(options_["window-size"].value);
+    passes = Util::fromString<unsigned int>(options_["passes"].value);
+    blur_radius = Util::fromString<unsigned int>(options_["blur-radius"].value);
+    shadow_size = Util::fromString<unsigned int>(options_["shadow-size"].value);
+
+    if (options_["effect"].value == "blur")
+    {
+        if (windows == 4 && passes == 1 && blur_radius == 5)
+            ref = Canvas::Pixel(0x89, 0xa3, 0x53, 0xff);
+        else
+            return Scene::ValidationUnknown;
+    }
+    else if (options_["effect"].value == "shadow")
+    {
+        if (windows == 4 && fabs(window_size_factor - 0.35) < 0.0001 &&
+            shadow_size == 20)
+        {
+            ref = Canvas::Pixel(0x1f, 0x27, 0x0d, 0xff);
+        }
+        else
+        {
+            return Scene::ValidationUnknown;
+        }
+    }
+
+    Canvas::Pixel pixel = canvas_.read_pixel(512, 209);
+
+    double dist = pixel.distance_rgb(ref);
+    if (dist < radius_3d + 0.01) {
+        return Scene::ValidationSuccess;
+    }
+    else {
+        Log::debug("Validation failed! Expected: 0x%x Actual: 0x%x Distance: %f\n",
+                    ref.to_le32(), pixel.to_le32(), dist);
+        return Scene::ValidationFailure;
+    }
+
+    return Scene::ValidationUnknown;
+}
diff --git a/src/scene-effect-2d.cpp b/src/scene-effect-2d.cpp
new file mode 100644
index 0000000..9185d7b
--- /dev/null
+++ b/src/scene-effect-2d.cpp
@@ -0,0 +1,444 @@
+/*
+ * Copyright © 2010-2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis (glmark2)
+ *  Jesse Barker (glmark2)
+ */
+#include <cmath>
+#include <climits>
+#include <numeric>
+
+#include "scene.h"
+#include "mat.h"
+#include "stack.h"
+#include "vec.h"
+#include "log.h"
+#include "program.h"
+#include "shader-source.h"
+#include "util.h"
+#include "texture.h"
+
+SceneEffect2D::SceneEffect2D(Canvas &pCanvas) :
+    Scene(pCanvas, "effect2d")
+{
+    options_["kernel"] = Scene::Option("kernel",
+        "0,0,0;0,1,0;0,0,0",
+        "The convolution kernel matrix to use [format: \"a,b,c...;d,e,f...\"");;
+    options_["normalize"] = Scene::Option("normalize", "true",
+        "Whether to normalize the supplied convolution kernel matrix",
+        "false,true");
+}
+
+SceneEffect2D::~SceneEffect2D()
+{
+}
+
+/*
+ * Calculates the offset of the coefficient with index i
+ * from the center of the kernel matrix. Note that we are
+ * using the standard OpenGL texture coordinate system
+ * (x grows rightwards, y grows upwards).
+ */
+static LibMatrix::vec2
+calc_offset(unsigned int i, unsigned int width, unsigned int height)
+{
+    int x = i % width - (width - 1) / 2;
+    int y = -(i / width - (height - 1) / 2);
+
+    return LibMatrix::vec2(static_cast<float>(x),
+                           static_cast<float>(y));
+
+}
+
+/**
+ * Creates a fragment shader implementing 2D image convolution.
+ *
+ * In the mathematical definition of 2D convolution, the kernel/filter (2D
+ * impulse response) is essentially mirrored in both directions (that is,
+ * rotated 180 degrees) when being applied on a 2D block of data (eg pixels).
+ *
+ * Most image manipulation programs, however, use the term kernel/filter to
+ * describe a 180 degree rotation of the 2D impulse response. This is more
+ * intuitive from a human understanding perspective because this rotated matrix
+ * can be regarded as a stencil that can be directly applied by just "placing"
+ * it on the image.
+ *
+ * In order to be compatible with image manipulation programs, we will
+ * use the same definition of kernel/filter (180 degree rotation of impulse
+ * response). This also means that we don't need to perform the (implicit)
+ * rotation of the kernel in our convolution implementation.
+ *
+ * @param canvas the destination Canvas for this shader
+ * @param array the array holding the filter coefficients in row-major
+ *              order
+ * @param width the width of the filter
+ * @param width the height of the filter
+ *
+ * @return a string containing the frament source code
+ */
+static std::string
+create_convolution_fragment_shader(Canvas &canvas, std::vector<float> &array,
+                                   unsigned int width, unsigned int height)
+{
+    static const std::string frg_shader_filename(GLMARK_DATA_PATH"/shaders/effect-2d-convolution.frag");
+    ShaderSource source(frg_shader_filename);
+
+    if (width * height != array.size()) {
+        Log::error("Convolution filter size doesn't match supplied dimensions\n");
+        return "";
+    }
+
+    /* Steps are needed to be able to access nearby pixels */
+    source.add_const("TextureStepX", 1.0f/canvas.width());
+    source.add_const("TextureStepY", 1.0f/canvas.height());
+
+    std::stringstream ss_def;
+    std::stringstream ss_convolution;
+
+    /* Set up stringstream floating point options */
+    ss_def << std::fixed;
+    ss_convolution.precision(1);
+    ss_convolution << std::fixed;
+
+    ss_convolution << "result = ";
+
+    for(std::vector<float>::const_iterator iter = array.begin();
+        iter != array.end();
+        iter++)
+    {
+        unsigned int i = iter - array.begin();
+
+        /* Add Filter coefficient const definitions */
+        ss_def << "const float Kernel" << i << " = "
+               << *iter << ";" << std::endl;
+
+        /* Add convolution term using the current filter coefficient */
+        LibMatrix::vec2 offset(calc_offset(i, width, height));
+        ss_convolution << "texture2D(Texture0, TextureCoord + vec2("
+                       << offset.x() << " * TextureStepX, "
+                       << offset.y() << " * TextureStepY)) * Kernel" << i;
+        if (iter + 1 != array.end())
+            ss_convolution << " +" << std::endl;
+    }
+
+    ss_convolution << ";" << std::endl;
+
+    source.add(ss_def.str());
+    source.replace("$CONVOLUTION$", ss_convolution.str());
+
+    return source.str();
+}
+
+/**
+ * Creates a string containing a printout of a kernel matrix.
+ *
+ * @param filter the vector containing the filter coefficients
+ * @param width the width of the filter
+ *
+ * @return the printout
+ */
+static std::string
+kernel_printout(const std::vector<float> &kernel,
+                unsigned int width)
+{
+    std::stringstream ss;
+    ss << std::fixed;
+
+    for (std::vector<float>::const_iterator iter = kernel.begin();
+         iter != kernel.end();
+         iter++)
+    {
+        ss << *iter << " ";
+        if ((iter - kernel.begin()) % width == width - 1)
+            ss << std::endl;
+    }
+
+    return ss.str();
+}
+
+/**
+ * Parses a string representation of a matrix and returns it
+ * in row-major format.
+ *
+ * In the string representation, elements are delimited using
+ * commas (',') and rows are delimited using semi-colons (';').
+ * eg 0,0,0;0,1.0,0;0,0,0
+ *
+ * @param str the matrix string representation to parse
+ * @param matrix the float vector to populate
+ * @param[out] width the width of the matrix
+ * @param[out] height the height of the matrix
+ *
+ * @return whether parsing succeeded
+ */
+static bool
+parse_matrix(const std::string &str, std::vector<float> &matrix,
+             unsigned int &width, unsigned int &height)
+{
+    std::vector<std::string> rows;
+    unsigned int w = UINT_MAX;
+
+    Util::split(str, ';', rows, Util::SplitModeNormal);
+
+    Log::debug("Parsing kernel matrix:\n");
+    static const std::string format("%f ");
+    static const std::string format_cont(Log::continuation_prefix + format);
+    static const std::string newline(Log::continuation_prefix + "\n");
+
+    for (std::vector<std::string>::const_iterator iter = rows.begin();
+         iter != rows.end();
+         iter++)
+    {
+        std::vector<std::string> elems;
+        Util::split(*iter, ',', elems, Util::SplitModeNormal);
+
+        if (w != UINT_MAX && elems.size() != w) {
+            Log::error("Matrix row %u contains %u elements, whereas previous"
+                       " rows had %u\n",
+                       iter - rows.begin(), elems.size(), w);
+            return false;
+        }
+
+        w = elems.size();
+
+        for (std::vector<std::string>::const_iterator iter_el = elems.begin();
+             iter_el != elems.end();
+             iter_el++)
+        {
+            float f(Util::fromString<float>(*iter_el));
+            matrix.push_back(f);
+            if (iter_el == elems.begin())
+                Log::debug(format.c_str(), f);
+            else
+                Log::debug(format_cont.c_str(), f);
+        }
+
+        Log::debug(newline.c_str());
+    }
+
+    width = w;
+    height = rows.size();
+
+    return true;
+}
+
+/**
+ * Normalizes a convolution kernel matrix.
+ *
+ * @param filter the filter to normalize
+ */
+static void
+normalize(std::vector<float> &kernel)
+{
+    float sum = std::accumulate(kernel.begin(), kernel.end(), 0.0);
+
+    /*
+     * If sum is essentially zero, perform a zero-sum normalization.
+     * This normalizes positive and negative values separately,
+     */
+    if (fabs(sum) < 0.00000001) {
+        sum = 0.0;
+        for (std::vector<float>::iterator iter = kernel.begin();
+             iter != kernel.end();
+             iter++)
+        {
+            if (*iter > 0.0)
+                sum += *iter;
+        }
+    }
+
+    /*
+     * We can simply compare with 0.0f here, because we just care about
+     * avoiding division-by-zero.
+     */
+    if (sum == 0.0)
+        return;
+
+    for (std::vector<float>::iterator iter = kernel.begin();
+         iter != kernel.end();
+         iter++)
+    {
+        *iter /= sum;
+    }
+
+}
+
+bool
+SceneEffect2D::load()
+{
+    Texture::load("effect-2d", &texture_,
+                  GL_NEAREST, GL_NEAREST, 0);
+    running_ = false;
+
+    return true;
+}
+
+void
+SceneEffect2D::unload()
+{
+    glDeleteTextures(1, &texture_);
+}
+
+bool
+SceneEffect2D::setup()
+{
+    if (!Scene::setup())
+        return false;
+
+    Texture::find_textures();
+
+    static const std::string vtx_shader_filename(GLMARK_DATA_PATH"/shaders/effect-2d.vert");
+
+    std::vector<float> kernel;
+    unsigned int kernel_width = 0;
+    unsigned int kernel_height = 0;
+
+    /* Parse the kernel matrix from the options */
+    if (!parse_matrix(options_["kernel"].value, kernel,
+                      kernel_width, kernel_height))
+    {
+        return false;
+    }
+
+    /* Normalize the kernel matrix if needed */
+    if (options_["normalize"].value == "true") {
+        normalize(kernel);
+        Log::debug("Normalized kernel matrix:\n%s",
+                   kernel_printout(kernel, kernel_width).c_str());
+    }
+
+    /* Create and load the shaders */
+    ShaderSource vtx_source(vtx_shader_filename);
+    ShaderSource frg_source;
+    frg_source.append(create_convolution_fragment_shader(canvas_, kernel,
+                                                         kernel_width,
+                                                         kernel_height));
+
+    if (frg_source.str().empty())
+        return false;
+
+    if (!Scene::load_shaders_from_strings(program_, vtx_source.str(),
+                                          frg_source.str()))
+    {
+        return false;
+    }
+
+    std::vector<int> vertex_format;
+    vertex_format.push_back(3);
+    mesh_.set_vertex_format(vertex_format);
+
+    mesh_.make_grid(1, 1, 2.0, 2.0, 0.0);
+    mesh_.build_vbo();
+
+    std::vector<GLint> attrib_locations;
+    attrib_locations.push_back(program_["position"].location());
+    mesh_.set_attrib_locations(attrib_locations);
+
+    program_.start();
+
+    // Load texture sampler value
+    program_["Texture0"] = 0;
+
+    currentFrame_ = 0;
+    running_ = true;
+    startTime_ = Util::get_timestamp_us() / 1000000.0;
+    lastUpdateTime_ = startTime_;
+
+    return true;
+}
+
+void
+SceneEffect2D::teardown()
+{
+    mesh_.reset();
+
+    program_.stop();
+    program_.release();
+
+    Scene::teardown();
+}
+
+void
+SceneEffect2D::update()
+{
+    Scene::update();
+}
+
+void
+SceneEffect2D::draw()
+{
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, texture_);
+
+    mesh_.render_vbo();
+}
+
+Scene::ValidationResult
+SceneEffect2D::validate()
+{
+    static const double radius_3d(std::sqrt(3.0));
+
+    std::vector<float> kernel;
+    std::vector<float> kernel_edge;
+    std::vector<float> kernel_blur;
+    unsigned int kernel_width = 0;
+    unsigned int kernel_height = 0;
+
+    if (!parse_matrix("0,1,0;1,-4,1;0,1,0;", kernel_edge,
+                      kernel_width, kernel_height))
+    {
+        return Scene::ValidationUnknown;
+    }
+
+    if (!parse_matrix("1,1,1,1,1;1,1,1,1,1;1,1,1,1,1;",
+                      kernel_blur,
+                      kernel_width, kernel_height))
+    {
+        return Scene::ValidationUnknown;
+    }
+
+    if (!parse_matrix(options_["kernel"].value, kernel,
+                      kernel_width, kernel_height))
+    {
+        return Scene::ValidationUnknown;
+    }
+
+    Canvas::Pixel ref;
+
+    if (kernel == kernel_edge)
+        ref = Canvas::Pixel(0x17, 0x0c, 0x2f, 0xff);
+    else if (kernel == kernel_blur)
+        ref = Canvas::Pixel(0xc7, 0xe1, 0x8d, 0xff);
+    else
+        return Scene::ValidationUnknown;
+
+    Canvas::Pixel pixel = canvas_.read_pixel(452, 237);
+
+    double dist = pixel.distance_rgb(ref);
+    if (dist < radius_3d + 0.01) {
+        return Scene::ValidationSuccess;
+    }
+    else {
+        Log::debug("Validation failed! Expected: 0x%x Actual: 0x%x Distance: %f\n",
+                   ref.to_le32(), pixel.to_le32(), dist);
+        return Scene::ValidationFailure;
+    }
+
+    return Scene::ValidationUnknown;
+}
diff --git a/src/scene-function.cpp b/src/scene-function.cpp
new file mode 100644
index 0000000..0bd9468
--- /dev/null
+++ b/src/scene-function.cpp
@@ -0,0 +1,182 @@
+/*
+ * Copyright © 2010-2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis (glmark2)
+ */
+#include <cmath>
+
+#include "scene.h"
+#include "mat.h"
+#include "stack.h"
+#include "vec.h"
+#include "log.h"
+#include "shader-source.h"
+#include "util.h"
+
+static const std::string shader_file_base(GLMARK_DATA_PATH"/shaders/function");
+
+static const std::string vtx_file(shader_file_base + ".vert");
+static const std::string frg_file(shader_file_base + ".frag");
+static const std::string call_file(shader_file_base + "-call.all");
+static const std::string step_low_file(shader_file_base + "-step-low.all");
+static const std::string step_medium_file(shader_file_base + "-step-medium.all");
+
+SceneFunction::SceneFunction(Canvas &pCanvas) :
+    SceneGrid(pCanvas, "function")
+{
+    options_["fragment-steps"] = Scene::Option("fragment-steps", "1",
+            "The number of computational steps in the fragment shader");
+    options_["fragment-function"] = Scene::Option("fragment-function", "true",
+            "Whether each computational step includes a function call", "false,true");
+    options_["vertex-steps"] = Scene::Option("vertex-steps", "1",
+            "The number of computational steps in the vertex shader");
+    options_["vertex-function"] = Scene::Option("vertex-function", "true",
+            "Whether each computational step includes an if-else clause", "false,true");
+    options_["vertex-complexity"] = Scene::Option("vertex-complexity", "low",
+            "The complexity of each computational step in the vertex shader", "low,medium");
+    options_["fragment-complexity"] = Scene::Option("fragment-complexity", "low",
+            "The complexity of each computational step in the fragment shader", "low,medium");
+}
+
+SceneFunction::~SceneFunction()
+{
+}
+
+static std::string
+get_vertex_shader_source(int steps, bool function, std::string &complexity)
+{
+    ShaderSource source(vtx_file);
+    ShaderSource source_main;
+    std::string step_file;
+
+    if (complexity == "low")
+        step_file = step_low_file;
+    else if (complexity == "medium")
+        step_file = step_medium_file;
+
+    for (int i = 0; i < steps; i++) {
+        if (function)
+            source_main.append_file(call_file);
+        else
+            source_main.append_file(step_file);
+    }
+
+    if (function)
+        source.replace_with_file("$PROCESS$", step_file);
+    else
+        source.replace("$PROCESS$", "");
+
+    source.replace("$MAIN$", source_main.str());
+
+    return source.str();
+}
+
+static std::string
+get_fragment_shader_source(int steps, bool function, std::string &complexity)
+{
+    ShaderSource source(frg_file);
+    ShaderSource source_main;
+    std::string step_file;
+
+    if (complexity == "low")
+        step_file = step_low_file;
+    else if (complexity == "medium")
+        step_file = step_medium_file;
+
+    for (int i = 0; i < steps; i++) {
+        if (function)
+            source_main.append_file(call_file);
+        else
+            source_main.append_file(step_file);
+    }
+
+    if (function)
+        source.replace_with_file("$PROCESS$", step_file);
+    else
+        source.replace("$PROCESS$", "");
+
+    source.replace("$MAIN$", source_main.str());
+
+    return source.str();
+}
+
+bool
+SceneFunction::setup()
+{
+    if (!SceneGrid::setup())
+        return false;
+
+    /* Parse options */
+    bool vtx_function = options_["vertex-function"].value == "true";
+    bool frg_function = options_["fragment-function"].value == "true";
+    std::string vtx_complexity = options_["vertex-complexity"].value;
+    std::string frg_complexity = options_["fragment-complexity"].value;
+    int vtx_steps = Util::fromString<int>(options_["vertex-steps"].value);
+    int frg_steps = Util::fromString<int>(options_["fragment-steps"].value);
+
+    /* Load shaders */
+    std::string vtx_shader(get_vertex_shader_source(vtx_steps, vtx_function,
+                                                    vtx_complexity));
+    std::string frg_shader(get_fragment_shader_source(frg_steps, frg_function,
+                                                      frg_complexity));
+
+    if (!Scene::load_shaders_from_strings(program_, vtx_shader, frg_shader))
+        return false;
+
+    program_.start();
+
+    std::vector<GLint> attrib_locations;
+    attrib_locations.push_back(program_["position"].location());
+    mesh_.set_attrib_locations(attrib_locations);
+
+    running_ = true;
+    startTime_ = Util::get_timestamp_us() / 1000000.0;
+    lastUpdateTime_ = startTime_;
+
+    return true;
+}
+
+Scene::ValidationResult
+SceneFunction::validate()
+{
+    static const double radius_3d(std::sqrt(3.0 * 15.0 * 15.0));
+
+    int frg_steps = Util::fromString<int>(options_["fragment-steps"].value);
+
+    Canvas::Pixel ref;
+
+    if (frg_steps == 5)
+        ref = Canvas::Pixel(0x5e, 0x5e, 0x5e, 0xff);
+    else
+        return Scene::ValidationUnknown;
+
+    Canvas::Pixel pixel = canvas_.read_pixel(293, 89);
+
+    double dist = pixel.distance_rgb(ref);
+    if (dist < radius_3d + 0.01) {
+        return Scene::ValidationSuccess;
+    }
+    else {
+        Log::debug("Validation failed! Expected: 0x%x Actual: 0x%x Distance: %f\n",
+                    ref.to_le32(), pixel.to_le32(), dist);
+        return Scene::ValidationFailure;
+    }
+
+    return Scene::ValidationUnknown;
+}
diff --git a/src/scene-grid.cpp b/src/scene-grid.cpp
new file mode 100644
index 0000000..a9d07e0
--- /dev/null
+++ b/src/scene-grid.cpp
@@ -0,0 +1,126 @@
+/*
+ * Copyright © 2010-2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis (glmark2)
+ */
+#include "scene.h"
+#include "mat.h"
+#include "stack.h"
+#include "vec.h"
+#include "log.h"
+#include "util.h"
+
+SceneGrid::SceneGrid(Canvas &pCanvas, const std::string &name) :
+    Scene(pCanvas, name)
+{
+    options_["grid-size"] = Scene::Option("grid-size", "32",
+            "The number of squares per side of the grid (controls the number of vertices)");
+    options_["grid-length"] = Scene::Option("grid-length", "5.0",
+            "The length of each side of the grid (normalized) (controls the area drawn to)");
+}
+
+SceneGrid::~SceneGrid()
+{
+}
+
+bool
+SceneGrid::load()
+{
+    rotationSpeed_ = 36.0f;
+    running_ = false;
+
+    return true;
+}
+
+void
+SceneGrid::unload()
+{
+}
+
+bool
+SceneGrid::setup()
+{
+    if (!Scene::setup())
+        return false;
+
+    int grid_size(Util::fromString<int>(options_["grid-size"].value));
+    double grid_length(Util::fromString<double>(options_["grid-length"].value));
+
+    /* Create and configure the grid mesh */
+    std::vector<int> vertex_format;
+    vertex_format.push_back(3);
+    mesh_.set_vertex_format(vertex_format);
+
+    /*
+     * The spacing needed in order for the area of the requested grid
+     * to be the same as the area of a grid with size 32 and spacing 0.02.
+     */
+    double spacing = grid_length * (1 - 4.38 / 5.0) / (grid_size - 1.0);
+
+    mesh_.make_grid(grid_size, grid_size, grid_length, grid_length,
+                    grid_size > 1 ? spacing : 0);
+    mesh_.build_vbo();
+
+    currentFrame_ = 0;
+    rotation_ = 0.0f;
+
+    return true;
+}
+
+void
+SceneGrid::teardown()
+{
+    program_.stop();
+    program_.release();
+    mesh_.reset();
+
+    Scene::teardown();
+}
+
+void
+SceneGrid::update()
+{
+    Scene::update();
+
+    double elapsed_time = lastUpdateTime_ - startTime_;
+
+    rotation_ = rotationSpeed_ * elapsed_time;
+}
+
+void
+SceneGrid::draw()
+{
+    // Load the ModelViewProjectionMatrix uniform in the shader
+    LibMatrix::Stack4 model_view;
+    LibMatrix::mat4 model_view_proj(canvas_.projection());
+
+    model_view.translate(0.0f, 0.0f, -5.0f);
+    model_view.rotate(rotation_, 0.0f, 0.0f, 1.0f);
+    model_view_proj *= model_view.getCurrent();
+
+    program_["ModelViewProjectionMatrix"] = model_view_proj;
+
+    mesh_.render_vbo();
+}
+
+Scene::ValidationResult
+SceneGrid::validate()
+{
+    return Scene::ValidationUnknown;
+}
diff --git a/src/scene-ideas.cpp b/src/scene-ideas.cpp
new file mode 100644
index 0000000..af716bd
--- /dev/null
+++ b/src/scene-ideas.cpp
@@ -0,0 +1,414 @@
+/*
+ * (c) Copyright 1993, Silicon Graphics, Inc.
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Jesse Barker
+ */
+#include "scene.h"
+#include "stack.h"
+#include "splines.h"
+#include "table.h"
+#include "logo.h"
+#include "lamp.h"
+#include "util.h"
+#include "log.h"
+#include <sys/time.h>
+
+using LibMatrix::Stack4;
+using LibMatrix::mat4;
+using LibMatrix::vec3;
+using LibMatrix::vec4;
+using LibMatrix::uvec3;
+using std::string;
+using std::map;
+
+class SceneIdeasPrivate
+{
+public:
+    SceneIdeasPrivate() :
+        valid_(false),
+        currentSpeed_(1.0), // Real time.
+        currentTime_(START_TIME_),
+        timeOffset_(START_TIME_)
+    {
+        startTime_.tv_sec = 0;
+        startTime_.tv_usec = 0; 
+    }
+    ~SceneIdeasPrivate()
+    {
+    }
+    void initialize(map<string, Scene::Option>& options);
+    void reset_time();
+    void update_time();
+    void update_projection(const mat4& proj);
+    void draw();
+    bool valid() { return valid_; }
+
+private:
+    void postIdle();
+    void initLights();
+    bool valid_;
+    Stack4 projection_;
+    Stack4 modelview_;
+    float currentSpeed_;
+    float currentTime_;
+    float timeOffset_;
+    struct timeval startTime_;
+    static const float CYCLE_TIME_;
+    static const float TIME_;
+    static const float START_TIME_;
+    // Table
+    Table table_;
+    // Logo
+    SGILogo logo_;
+    // Lamp
+    Lamp lamp_;
+    // Light constants
+    static const vec4 light0_position_;
+    static const vec4 light1_position_;
+    static const vec4 light2_position_;
+    // Object constants
+    ViewFromSpline viewFromSpline_;
+    ViewToSpline viewToSpline_;
+    LightPositionSpline lightPosSpline_;
+    LogoPositionSpline logoPosSpline_;
+    LogoRotationSpline logoRotSpline_;
+    vec3 viewFrom_;
+    vec3 viewTo_;
+    vec3 lightPos_;
+    vec3 logoPos_;
+    vec3 logoRot_;
+    vec4 lightPositions_[3];
+};
+
+const float SceneIdeasPrivate::TIME_(15.0);
+const float SceneIdeasPrivate::CYCLE_TIME_(TIME_ * 1.0 - 3.0);
+const float SceneIdeasPrivate::START_TIME_(0.6);
+const vec4 SceneIdeasPrivate::light0_position_(0.0, 1.0, 0.0, 0.0);
+const vec4 SceneIdeasPrivate::light1_position_(-1.0, 0.0, 0.0, 0.0);
+const vec4 SceneIdeasPrivate::light2_position_(0.0, -1.0, 0.0, 0.0);
+
+void
+SceneIdeasPrivate::initLights()
+{
+    const mat4& curMV(modelview_.getCurrent());
+    lightPositions_[0] = curMV * light0_position_;
+    lightPositions_[1] = curMV * light1_position_;
+    lightPositions_[2] = curMV * light2_position_;
+}
+
+void
+SceneIdeasPrivate::initialize(map<string, Scene::Option>& options)
+{
+    // Initialize the positions for the lights we'll use.
+    initLights();
+
+    // Tell the objects in the scene to initialize themselves.
+    table_.init();
+    if (!table_.valid())
+    {
+        Log::debug("SceneIdeas: table object not properly initialized!\n");
+        return;
+    }
+    logo_.init();
+    if (!logo_.valid())
+    {
+        Log::debug("SceneIdeas: logo object not properly initialized!\n");
+        return;
+    }
+    lamp_.init();
+    if (!lamp_.valid())
+    {
+        Log::debug("SceneIdeas: lamp object not properly initialized!\n");
+        return;
+    }
+
+    reset_time();
+
+    // If the option string tells us the user wants the speed to be a function
+    // of the scene duration, do it.  Otherwise, take the value explicitly.
+    static const string durationLabel("duration");
+    static const string speedLabel("speed");
+    if (options[speedLabel].value == durationLabel)
+    {
+        float duration = Util::fromString<float>(options[durationLabel].value);
+        currentSpeed_ = (CYCLE_TIME_ - START_TIME_) / duration;
+    }
+    else
+    {
+        currentSpeed_ = Util::fromString<float>(options[speedLabel].value);
+    }
+
+    // If we're here, we're okay to run.
+    valid_ = true;
+}
+
+void
+SceneIdeasPrivate::reset_time()
+{
+    timeOffset_ = START_TIME_;
+    gettimeofday(&startTime_, NULL);
+}
+
+void
+SceneIdeasPrivate::update_time()
+{
+    // Compute new time
+    struct timeval current = {0, 0};
+    gettimeofday(&current, NULL);
+    float timediff = (current.tv_sec - startTime_.tv_sec) + 
+        static_cast<double>(current.tv_usec - startTime_.tv_usec) / 1000000.0;
+    float sceneTime = timediff * currentSpeed_ + timeOffset_;
+
+    // Keep the current time in [START_TIME_..CYCLE_TIME_)
+    // Every other cycle starting with 0 start at the beginning and goes
+    // forward in time.  Other cycles start at the end and go backwards.
+    currentTime_ = std::fmod(sceneTime, CYCLE_TIME_);
+    unsigned int cycle = sceneTime/CYCLE_TIME_;
+    if (cycle % 2)
+    {
+        currentTime_ = CYCLE_TIME_ - currentTime_;
+    }
+}
+
+void
+SceneIdeasPrivate::update_projection(const mat4& proj)
+{
+    // Projection hasn't changed since last frame.
+    if (projection_.getCurrent() == proj)
+    {
+        return;
+    }
+
+    projection_.loadIdentity();
+    projection_ *= proj;
+}
+
+SceneIdeas::SceneIdeas(Canvas& canvas) :
+    Scene(canvas, "ideas"), priv_(0)
+{
+    options_["speed"] = Scene::Option("speed", "duration",
+                                      "Time coefficient (1.0 is \"wall clock\" speed, <1.0 is slower, >1.0 is faster).  A special value of \"duration\" computes this as a function of the \"duration\" option");
+}
+
+SceneIdeas::~SceneIdeas()
+{
+    delete priv_;
+}
+
+bool
+SceneIdeas::load()
+{
+    running_ = false;
+    return true;
+}
+
+void
+SceneIdeas::unload()
+{
+}
+
+bool
+SceneIdeas::setup()
+{
+    if (!Scene::setup())
+        return false;
+
+    priv_ = new SceneIdeasPrivate();
+    priv_->initialize(options_);
+    if (!priv_->valid())
+        return false;
+
+    priv_->update_projection(canvas_.projection());
+
+    // Core Scene state
+    currentFrame_ = 0;
+    running_ = true;
+    startTime_ = Util::get_timestamp_us() / 1000000.0;
+    lastUpdateTime_ = startTime_;
+
+    return true;
+}
+
+void
+SceneIdeas::update()
+{
+    Scene::update();
+    priv_->update_time();
+    priv_->update_projection(canvas_.projection());
+}
+
+void
+SceneIdeasPrivate::draw()
+{
+    viewFromSpline_.getCurrentVec(currentTime_, viewFrom_);
+    viewToSpline_.getCurrentVec(currentTime_, viewTo_);
+    lightPosSpline_.getCurrentVec(currentTime_, lightPos_);
+    logoPosSpline_.getCurrentVec(currentTime_, logoPos_);
+    logoRotSpline_.getCurrentVec(currentTime_, logoRot_);
+
+    // Tell the logo its new position
+    logo_.setPosition(logoPos_);
+
+    vec4 lp4(lightPos_.x(), lightPos_.y(), lightPos_.z(), 0.0);
+
+    //
+    // SHADOW
+    //
+    modelview_.loadIdentity();
+    modelview_.lookAt(viewFrom_.x(), viewFrom_.y(), viewFrom_.z(), 
+                      viewTo_.x(), viewTo_.y(), viewTo_.z(),
+                      0.0, 1.0, 0.0);
+
+    float pca(0.0);
+    if (viewFrom_.y() > 0.0)
+    {
+        table_.draw(modelview_, projection_, lightPos_, logoPos_, currentTime_, pca);
+    }
+
+    glEnable(GL_CULL_FACE); 
+    glDisable(GL_DEPTH_TEST); 
+
+    if (logoPos_.y() < 0.0)
+    {
+        // Set the color assuming we're still under the table.
+        uvec3 flatColor(128 / 2,  102 / 2,  179 / 2);
+        if (logoPos_.y() > -0.33)
+        {
+            // We're emerging from the table
+            float c(1.0 - logoPos_.y() / -0.33);
+            pca /= 4.0;
+            flatColor.x(static_cast<unsigned int>(128.0 * (1.0 - c) * 0.5 + 255.0 * pca * c));
+            flatColor.y(static_cast<unsigned int>(102.0 * (1.0 - c) * 0.5 + 255.0 * pca * c));
+            flatColor.z(static_cast<unsigned int>(179.0 * (1.0 - c) * 0.5 + 200.0 * pca * c));
+        }
+
+        modelview_.push();
+        modelview_.scale(0.04, 0.0, 0.04);
+        modelview_.rotate(-90.0, 1.0, 0.0, 0.0);
+        modelview_.rotate(0.1 * static_cast<int>(10.0 * logoRot_.z()), 0.0, 0.0, 1.0);
+        modelview_.rotate(0.1 * static_cast<int>(10.0 * logoRot_.y()), 0.0, 1.0, 0.0);
+        modelview_.rotate(0.1 * static_cast<int>(10.0 * logoRot_.x()), 1.0, 0.0, 0.0);
+        modelview_.rotate(0.1 * 353, 1.0, 0.0, 0.0);
+        modelview_.rotate(0.1 * 450, 0.0, 1.0, 0.0);
+
+        logo_.draw(modelview_, projection_, lightPositions_[0], SGILogo::LOGO_FLAT, flatColor);
+
+        modelview_.pop();
+    }
+    
+    if (logoPos_.y() > 0.0)
+    {
+        modelview_.push();
+        modelview_.translate(lightPos_.x(), lightPos_.y(), lightPos_.z());
+        mat4 tv;
+        tv[3][1] = -1.0;
+        tv[3][3] = 0.0;
+        tv[0][0] = tv[1][1] = tv[2][2] = lightPos_.y();
+        modelview_ *= tv;
+        modelview_.translate(-lightPos_.x() + logoPos_.x(),
+                             -lightPos_.y() + logoPos_.y(),
+                             -lightPos_.z() + logoPos_.z());
+        modelview_.scale(0.04, 0.04, 0.04);
+        modelview_.rotate(-90.0, 1.0, 0.0, 0.0);
+        modelview_.rotate(0.1 * static_cast<int>(10.0 * logoRot_.z()), 0.0, 0.0, 1.0);
+        modelview_.rotate(0.1 * static_cast<int>(10.0 * logoRot_.y()), 0.0, 1.0, 0.0);
+        modelview_.rotate(0.1 * static_cast<int>(10.0 * logoRot_.x()), 1.0, 0.0, 0.0);
+        modelview_.rotate(35.3, 1.0, 0.0, 0.0);
+        modelview_.rotate(45.0, 0.0, 1.0, 0.0);
+
+        logo_.draw(modelview_, projection_, lightPositions_[0], SGILogo::LOGO_SHADOW);
+
+        modelview_.pop();
+    }
+    //
+    // DONE SHADOW 
+    //
+
+    glEnable(GL_DEPTH_TEST);
+    glDisable(GL_CULL_FACE);
+
+    modelview_.loadIdentity();
+    modelview_.lookAt(viewFrom_.x(), viewFrom_.y(), viewFrom_.z(),
+                      viewTo_.x(), viewTo_.y(), viewTo_.z(), 
+                      0.0, 1.0, 0.0);
+    modelview_.push();
+    modelview_.translate(lightPos_.x(), lightPos_.y(), lightPos_.z());
+    modelview_.scale(0.1, 0.1, 0.1);
+    float x(lightPos_.x() - logoPos_.x());
+    float y(lightPos_.y() - logoPos_.y());
+    float z(lightPos_.z() - logoPos_.z());
+    double a3(0.0);
+    if (x != 0.0)
+    {
+        a3 = -atan2(z, x) * 10.0 * 180.0 / M_PI;
+    }
+    double a4(-atan2(sqrt(x * x + z * z), y) * 10.0 * 180.0 / M_PI);
+    modelview_.rotate(0.1 * static_cast<int>(a3), 0.0, 1.0, 0.0);
+    modelview_.rotate(0.1 * static_cast<int>(a4), 0.0, 0.0, 1.0);
+    modelview_.rotate(-90.0, 1.0, 0.0, 0.0);
+
+    lamp_.draw(modelview_, projection_, lightPositions_);
+
+    modelview_.pop();
+    
+    lightPositions_[0] = modelview_.getCurrent() * lp4;
+    
+    if (logoPos_.y() > -0.33)
+    {
+        modelview_.push();
+        modelview_.translate(logoPos_.x(), logoPos_.y(), logoPos_.z());
+        modelview_.scale(0.04, 0.04, 0.04);
+        modelview_.rotate(-90.0, 1.0, 0.0, 0.0);
+        modelview_.rotate(0.1 * static_cast<int>(10.0 * logoRot_.z()), 0.0, 0.0, 1.0);
+        modelview_.rotate(0.1 * static_cast<int>(10.0 * logoRot_.y()), 0.0, 1.0, 0.0);
+        modelview_.rotate(0.1 * static_cast<int>(10.0 * logoRot_.x()), 1.0, 0.0, 0.0);
+        modelview_.rotate(35.3, 1.0, 0.0, 0.0);
+        modelview_.rotate(45.0, 0.0, 1.0, 0.0);
+
+        logo_.draw(modelview_, projection_, lightPositions_[0], SGILogo::LOGO_NORMAL);
+
+        modelview_.pop();
+    }
+    
+    if (viewFrom_.y() < 0.0)
+    {
+        table_.drawUnder(modelview_, projection_);
+    }
+}
+
+void
+SceneIdeas::draw()
+{
+    priv_->draw();
+}
+
+Scene::ValidationResult
+SceneIdeas::validate()
+{
+    return Scene::ValidationUnknown;
+}
+
+void
+SceneIdeas::teardown()
+{
+    delete priv_;
+    priv_ = 0;
+    Scene::teardown();
+}
diff --git a/src/scene-ideas/a.cc b/src/scene-ideas/a.cc
new file mode 100644
index 0000000..6a0ab15
--- /dev/null
+++ b/src/scene-ideas/a.cc
@@ -0,0 +1,179 @@
+/*
+ * Vertex position data describing the letter 'a'
+ *
+ * (c) Copyright 1993, Silicon Graphics, Inc.
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Jesse Barker
+ */
+#include "characters.h"
+
+using LibMatrix::vec2;
+
+LetterA::LetterA()
+{
+    // Vertex data...
+    vertexData_.push_back(vec2(5.618949, 10.261048));
+    vertexData_.push_back(vec2(5.322348, 9.438848));
+    vertexData_.push_back(vec2(5.124614, 10.030832));
+    vertexData_.push_back(vec2(4.860968, 9.488181));
+    vertexData_.push_back(vec2(4.811534, 9.932169));
+    vertexData_.push_back(vec2(3.938208, 9.438848));
+    vertexData_.push_back(vec2(3.658084, 9.685509));
+    vertexData_.push_back(vec2(2.784758, 8.994862));
+    vertexData_.push_back(vec2(2.801236, 9.175745));
+    vertexData_.push_back(vec2(1.960865, 8.172662));
+    vertexData_.push_back(vec2(1.186406, 7.761562));
+    vertexData_.push_back(vec2(1.252317, 6.561151));
+    vertexData_.push_back(vec2(0.576725, 6.610483));
+    vertexData_.push_back(vec2(0.939238, 5.525180));
+    vertexData_.push_back(vec2(0.164779, 4.883864));
+    vertexData_.push_back(vec2(0.840371, 4.818089));
+    vertexData_.push_back(vec2(0.230690, 3.963001));
+    vertexData_.push_back(vec2(0.939238, 4.242549));
+    vertexData_.push_back(vec2(0.609681, 3.255909));
+    vertexData_.push_back(vec2(1.268795, 3.963001));
+    vertexData_.push_back(vec2(1.021627, 3.075026));
+    vertexData_.push_back(vec2(1.861998, 4.045221));
+    vertexData_.push_back(vec2(1.829042, 3.535457));
+    vertexData_.push_back(vec2(2.817714, 4.818089));
+    vertexData_.push_back(vec2(3.163749, 4.998972));
+    vertexData_.push_back(vec2(3.971164, 6.643371));
+    vertexData_.push_back(vec2(4.267765, 6.725591));
+    vertexData_.push_back(vec2(4.663234, 7.630010));
+    vertexData_.push_back(vec2(5.404737, 9.734840));
+    vertexData_.push_back(vec2(4.646756, 9.669065));
+    vertexData_.push_back(vec2(5.108136, 8.731757));
+    vertexData_.push_back(vec2(4.679712, 8.600205));
+    vertexData_.push_back(vec2(4.926879, 7.564234));
+    vertexData_.push_back(vec2(4.366632, 6.692703));
+    vertexData_.push_back(vec2(4.663234, 5.344296));
+    vertexData_.push_back(vec2(3.888774, 4.850976));
+    vertexData_.push_back(vec2(4.630278, 4.094553));
+    vertexData_.push_back(vec2(3.954686, 3.963001));
+    vertexData_.push_back(vec2(4.828012, 3.798561));
+    vertexData_.push_back(vec2(4.168898, 3.321686));
+    vertexData_.push_back(vec2(5.157569, 3.864337));
+    vertexData_.push_back(vec2(4.514933, 3.091470));
+    vertexData_.push_back(vec2(5.553038, 4.045221));
+    vertexData_.push_back(vec2(5.305870, 3.634121));
+    vertexData_.push_back(vec2(5.932029, 4.176773));
+
+    // Index data...
+    indexData_.push_back(0);
+    indexData_.push_back(1);
+    indexData_.push_back(2);
+    indexData_.push_back(3);
+    indexData_.push_back(4);
+    indexData_.push_back(5);
+    indexData_.push_back(6);
+    indexData_.push_back(7);
+    indexData_.push_back(8);
+    indexData_.push_back(9);
+    indexData_.push_back(10);
+    indexData_.push_back(11);
+    indexData_.push_back(12);
+    indexData_.push_back(13);
+    indexData_.push_back(14);
+    indexData_.push_back(15);
+    indexData_.push_back(16);
+    indexData_.push_back(17);
+    indexData_.push_back(18);
+    indexData_.push_back(19);
+    indexData_.push_back(20);
+    indexData_.push_back(21);
+    indexData_.push_back(22);
+    indexData_.push_back(23);
+    indexData_.push_back(24);
+    indexData_.push_back(25);
+    indexData_.push_back(26);
+    indexData_.push_back(27);
+    indexData_.push_back(28);
+    indexData_.push_back(29);
+    indexData_.push_back(30);
+    indexData_.push_back(31);
+    indexData_.push_back(32);
+    indexData_.push_back(33);
+    indexData_.push_back(34);
+    indexData_.push_back(35);
+    indexData_.push_back(36);
+    indexData_.push_back(37);
+    indexData_.push_back(38);
+    indexData_.push_back(39);
+    indexData_.push_back(40);
+    indexData_.push_back(41);
+    indexData_.push_back(42);
+    indexData_.push_back(43);
+    indexData_.push_back(44);
+    indexData_.push_back(0);
+    indexData_.push_back(2);
+    indexData_.push_back(4);
+    indexData_.push_back(6);
+    indexData_.push_back(8);
+    indexData_.push_back(10);
+    indexData_.push_back(12);
+    indexData_.push_back(14);
+    indexData_.push_back(16);
+    indexData_.push_back(18);
+    indexData_.push_back(20);
+    indexData_.push_back(22);
+    indexData_.push_back(24);
+    indexData_.push_back(26);
+    indexData_.push_back(27);
+    indexData_.push_back(25);
+    indexData_.push_back(23);
+    indexData_.push_back(21);
+    indexData_.push_back(19);
+    indexData_.push_back(17);
+    indexData_.push_back(15);
+    indexData_.push_back(13);
+    indexData_.push_back(11);
+    indexData_.push_back(9);
+    indexData_.push_back(7);
+    indexData_.push_back(5);
+    indexData_.push_back(3);
+    indexData_.push_back(1);
+    indexData_.push_back(28);
+    indexData_.push_back(30);
+    indexData_.push_back(32);
+    indexData_.push_back(34);
+    indexData_.push_back(36);
+    indexData_.push_back(38);
+    indexData_.push_back(40);
+    indexData_.push_back(42);
+    indexData_.push_back(44);
+    indexData_.push_back(43);
+    indexData_.push_back(41);
+    indexData_.push_back(39);
+    indexData_.push_back(37);
+    indexData_.push_back(35);
+    indexData_.push_back(33);
+    indexData_.push_back(31);
+    indexData_.push_back(29);
+
+    // Primitive state so that the draw call can issue the primitives we want.
+    unsigned int curOffset(0);
+    primVec_.push_back(PrimitiveState(GL_TRIANGLE_STRIP, 28, curOffset));
+    curOffset += (28 * sizeof(unsigned short));
+    primVec_.push_back(PrimitiveState(GL_TRIANGLE_STRIP, 17, curOffset));
+    curOffset += (17 * sizeof(unsigned short));
+    primVec_.push_back(PrimitiveState(GL_LINE_STRIP, 28, curOffset));
+    curOffset += (28 * sizeof(unsigned short));
+    primVec_.push_back(PrimitiveState(GL_LINE_STRIP, 17, curOffset));
+}
diff --git a/src/scene-ideas/characters.h b/src/scene-ideas/characters.h
new file mode 100644
index 0000000..ea56c57
--- /dev/null
+++ b/src/scene-ideas/characters.h
@@ -0,0 +1,157 @@
+/*
+ * (c) Copyright 1993, Silicon Graphics, Inc.
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Jesse Barker
+ */
+#ifndef CHARACTERS_H_
+#define CHARACTERS_H_
+
+#include <vector>
+#include "vec.h"
+#include "gl-headers.h"
+
+class PrimitiveState
+{
+public:
+    PrimitiveState(unsigned int type, unsigned int count, unsigned int offset) :
+        type_(type),
+        count_(count),
+        bufferOffset_(offset) {}
+    ~PrimitiveState() {}
+    void issue() const
+    {
+        glDrawElements(type_, count_, GL_UNSIGNED_SHORT, 
+            reinterpret_cast<const GLvoid*>(bufferOffset_));
+    }
+private:
+    PrimitiveState();
+    unsigned int type_;         // Primitive type (e.g. GL_TRIANGLE_STRIP)
+    unsigned int count_;        // Number of primitives
+    unsigned int bufferOffset_; // Offset into the element array buffer
+};
+
+struct Character
+{
+    void draw()
+    {
+        glBindBuffer(GL_ARRAY_BUFFER, bufferObjects_[0]);
+        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, bufferObjects_[1]);
+        glVertexAttribPointer(vertexIndex_, 2, GL_FLOAT, GL_FALSE, 0, 0);
+        glEnableVertexAttribArray(vertexIndex_);
+        for (std::vector<PrimitiveState>::const_iterator primIt = primVec_.begin();
+             primIt != primVec_.end();
+             primIt++)
+        {
+            primIt->issue();
+        }
+        glBindBuffer(GL_ARRAY_BUFFER, 0);
+        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
+    }
+    void init(int vertexAttribIndex) 
+    {
+        vertexIndex_ = vertexAttribIndex;
+
+        // We need 2 buffers for our work here.  One for the vertex data.
+        // and one for the index data.
+        glGenBuffers(2, &bufferObjects_[0]);
+
+        // First, setup the vertex data by binding the first buffer object, 
+        // allocating its data store, and filling it in with our vertex data.
+        glBindBuffer(GL_ARRAY_BUFFER, bufferObjects_[0]);
+        glBufferData(GL_ARRAY_BUFFER, vertexData_.size() * sizeof(LibMatrix::vec2), 
+            &vertexData_.front(), GL_STATIC_DRAW);
+
+        // Finally, setup the pointer to our vertex data and enable this
+        // attribute array.
+        glVertexAttribPointer(vertexIndex_, 2, GL_FLOAT, GL_FALSE, 0, 0);
+        glEnableVertexAttribArray(vertexIndex_);
+
+        // Now repeat for our index data.
+        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, bufferObjects_[1]);
+        glBufferData(GL_ELEMENT_ARRAY_BUFFER, 
+            indexData_.size() * sizeof(unsigned short), &indexData_.front(), 
+            GL_STATIC_DRAW);
+
+        // Unbind our vertex buffer objects so that their state isn't affected
+        // by other objects.
+        glBindBuffer(GL_ARRAY_BUFFER, 0);
+        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
+    }
+    ~Character()
+    {
+        glDeleteBuffers(2, &bufferObjects_[0]);
+    }
+    Character() :
+        vertexIndex_(0),
+        vertexArray_(0) {}
+    unsigned int bufferObjects_[2];
+    std::vector<LibMatrix::vec2> vertexData_;
+    std::vector<unsigned short> indexData_;
+    int vertexIndex_;
+    unsigned int vertexArray_;
+    std::vector<PrimitiveState> primVec_;
+};
+
+struct LetterI : Character
+{
+    LetterI();
+};
+
+struct LetterD : Character
+{
+    LetterD();
+};
+
+struct LetterE : Character
+{
+    LetterE();
+};
+
+struct LetterA : Character
+{
+    LetterA();
+};
+
+struct LetterS : Character
+{
+    LetterS();
+};
+
+struct LetterN : Character
+{
+    LetterN();
+};
+
+struct LetterM : Character
+{
+    LetterM();
+};
+
+struct LetterO : Character
+{
+    LetterO();
+};
+
+struct LetterT : Character
+{
+    LetterT();
+};
+
+#endif // CHARACTERS_H_
diff --git a/src/scene-ideas/d.cc b/src/scene-ideas/d.cc
new file mode 100644
index 0000000..0d8f7d7
--- /dev/null
+++ b/src/scene-ideas/d.cc
@@ -0,0 +1,142 @@
+/*
+ * Vertex position data describing the letter 'd'
+ *
+ * (c) Copyright 1993, Silicon Graphics, Inc.
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Jesse Barker
+ */
+#include "characters.h"
+
+using LibMatrix::vec2;
+
+LetterD::LetterD()
+{
+    // Vertex data...
+    vertexData_.push_back(vec2(4.714579, 9.987679));
+    vertexData_.push_back(vec2(2.841889, 9.429158));
+    vertexData_.push_back(vec2(2.825462, 9.166325));
+    vertexData_.push_back(vec2(1.856263, 8.722793));
+    vertexData_.push_back(vec2(2.004107, 8.000000));
+    vertexData_.push_back(vec2(0.969199, 7.605750));
+    vertexData_.push_back(vec2(1.494866, 6.636550));
+    vertexData_.push_back(vec2(0.607803, 6.028748));
+    vertexData_.push_back(vec2(1.527721, 4.960986));
+    vertexData_.push_back(vec2(0.772074, 4.254620));
+    vertexData_.push_back(vec2(1.774127, 4.139630));
+    vertexData_.push_back(vec2(1.445585, 3.186858));
+    vertexData_.push_back(vec2(2.266940, 3.843942));
+    vertexData_.push_back(vec2(2.250513, 3.022587));
+    vertexData_.push_back(vec2(2.776181, 3.843942));
+    vertexData_.push_back(vec2(3.137577, 3.383984));
+    vertexData_.push_back(vec2(3.351129, 4.008214));
+    vertexData_.push_back(vec2(3.909651, 4.451746));
+    vertexData_.push_back(vec2(4.090349, 4.960986));
+    vertexData_.push_back(vec2(4.862423, 5.946612));
+    vertexData_.push_back(vec2(4.763860, 6.652977));
+    vertexData_.push_back(vec2(5.388090, 7.572895));
+    vertexData_.push_back(vec2(4.862423, 8.492813));
+    vertexData_.push_back(vec2(5.618070, 9.921971));
+    vertexData_.push_back(vec2(4.698152, 10.940452));
+    vertexData_.push_back(vec2(5.338809, 12.303902));
+    vertexData_.push_back(vec2(4.238193, 12.960985));
+    vertexData_.push_back(vec2(4.451746, 14.554415));
+    vertexData_.push_back(vec2(3.581109, 14.291581));
+    vertexData_.push_back(vec2(3.613963, 15.342916));
+    vertexData_.push_back(vec2(2.677618, 15.145790));
+    vertexData_.push_back(vec2(2.480493, 15.540041));
+    vertexData_.push_back(vec2(2.036961, 15.211499));
+    vertexData_.push_back(vec2(1.281314, 15.112936));
+
+    // Index data...
+    indexData_.push_back(0);
+    indexData_.push_back(1);
+    indexData_.push_back(2);
+    indexData_.push_back(3);
+    indexData_.push_back(4);
+    indexData_.push_back(5);
+    indexData_.push_back(6);
+    indexData_.push_back(7);
+    indexData_.push_back(8);
+    indexData_.push_back(9);
+    indexData_.push_back(10);
+    indexData_.push_back(11);
+    indexData_.push_back(12);
+    indexData_.push_back(13);
+    indexData_.push_back(14);
+    indexData_.push_back(15);
+    indexData_.push_back(16);
+    indexData_.push_back(17);
+    indexData_.push_back(18);
+    indexData_.push_back(19);
+    indexData_.push_back(20);
+    indexData_.push_back(21);
+    indexData_.push_back(22);
+    indexData_.push_back(23);
+    indexData_.push_back(24);
+    indexData_.push_back(25);
+    indexData_.push_back(26);
+    indexData_.push_back(27);
+    indexData_.push_back(28);
+    indexData_.push_back(29);
+    indexData_.push_back(30);
+    indexData_.push_back(31);
+    indexData_.push_back(32);
+    indexData_.push_back(33);
+    indexData_.push_back(0);
+    indexData_.push_back(2);
+    indexData_.push_back(4);
+    indexData_.push_back(6);
+    indexData_.push_back(8);
+    indexData_.push_back(10);
+    indexData_.push_back(12);
+    indexData_.push_back(14);
+    indexData_.push_back(16);
+    indexData_.push_back(18);
+    indexData_.push_back(20);
+    indexData_.push_back(22);
+    indexData_.push_back(24);
+    indexData_.push_back(26);
+    indexData_.push_back(28);
+    indexData_.push_back(30);
+    indexData_.push_back(32);
+    indexData_.push_back(33);
+    indexData_.push_back(31);
+    indexData_.push_back(29);
+    indexData_.push_back(27);
+    indexData_.push_back(25);
+    indexData_.push_back(23);
+    indexData_.push_back(21);
+    indexData_.push_back(19);
+    indexData_.push_back(17);
+    indexData_.push_back(15);
+    indexData_.push_back(13);
+    indexData_.push_back(11);
+    indexData_.push_back(9);
+    indexData_.push_back(7);
+    indexData_.push_back(5);
+    indexData_.push_back(3);
+    indexData_.push_back(1);
+
+    // Primitive state so that the draw call can issue the primitives we want.
+    unsigned int curOffset(0);
+    primVec_.push_back(PrimitiveState(GL_TRIANGLE_STRIP, 34, curOffset));
+    curOffset += (34 * sizeof(unsigned short));
+    primVec_.push_back(PrimitiveState(GL_LINE_STRIP, 34, curOffset));
+}
diff --git a/src/scene-ideas/e.cc b/src/scene-ideas/e.cc
new file mode 100644
index 0000000..2330468
--- /dev/null
+++ b/src/scene-ideas/e.cc
@@ -0,0 +1,139 @@
+/*
+ * Vertex position data describing the letter 'e'
+ *
+ * (c) Copyright 1993, Silicon Graphics, Inc.
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Jesse Barker
+ */
+#include "characters.h"
+
+using LibMatrix::vec2;
+
+LetterE::LetterE()
+{
+    // Vertex data...
+    vertexData_.push_back(vec2(1.095436, 6.190871));
+    vertexData_.push_back(vec2(2.107884, 6.970954));
+    vertexData_.push_back(vec2(2.556017, 7.020747));
+    vertexData_.push_back(vec2(3.020747, 7.867220));
+    vertexData_.push_back(vec2(3.518672, 8.033195));
+    vertexData_.push_back(vec2(3.269710, 8.531120));
+    vertexData_.push_back(vec2(4.165975, 8.929461));
+    vertexData_.push_back(vec2(3.302905, 9.062241));
+    vertexData_.push_back(vec2(4.331950, 9.626556));
+    vertexData_.push_back(vec2(3.286307, 9.344398));
+    vertexData_.push_back(vec2(4.116183, 9.958507));
+    vertexData_.push_back(vec2(3.004149, 9.510373));
+    vertexData_.push_back(vec2(3.518672, 9.991701));
+    vertexData_.push_back(vec2(2.705394, 9.493776));
+    vertexData_.push_back(vec2(2.091286, 9.311203));
+    vertexData_.push_back(vec2(2.041494, 9.062241));
+    vertexData_.push_back(vec2(1.178423, 8.514523));
+    vertexData_.push_back(vec2(1.443983, 8.165976));
+    vertexData_.push_back(vec2(0.481328, 7.535270));
+    vertexData_.push_back(vec2(1.045643, 6.904564));
+    vertexData_.push_back(vec2(0.149378, 6.091286));
+    vertexData_.push_back(vec2(1.095436, 5.410789));
+    vertexData_.push_back(vec2(0.464730, 4.232365));
+    vertexData_.push_back(vec2(1.377593, 4.497925));
+    vertexData_.push_back(vec2(1.261411, 3.136930));
+    vertexData_.push_back(vec2(1.925311, 3.950207));
+    vertexData_.push_back(vec2(2.240664, 3.037344));
+    vertexData_.push_back(vec2(2.589212, 3.834025));
+    vertexData_.push_back(vec2(3.087137, 3.269710));
+    vertexData_.push_back(vec2(3.236515, 3.867220));
+    vertexData_.push_back(vec2(3.684647, 3.867220));
+    vertexData_.push_back(vec2(3.867220, 4.448133));
+    vertexData_.push_back(vec2(4.398340, 5.128631));
+
+    // Index data...
+    indexData_.push_back(0);
+    indexData_.push_back(1);
+    indexData_.push_back(2);
+    indexData_.push_back(3);
+    indexData_.push_back(4);
+    indexData_.push_back(5);
+    indexData_.push_back(6);
+    indexData_.push_back(7);
+    indexData_.push_back(8);
+    indexData_.push_back(9);
+    indexData_.push_back(10);
+    indexData_.push_back(11);
+    indexData_.push_back(12);
+    indexData_.push_back(13);
+    indexData_.push_back(14);
+    indexData_.push_back(15);
+    indexData_.push_back(16);
+    indexData_.push_back(17);
+    indexData_.push_back(18);
+    indexData_.push_back(19);
+    indexData_.push_back(20);
+    indexData_.push_back(21);
+    indexData_.push_back(22);
+    indexData_.push_back(23);
+    indexData_.push_back(24);
+    indexData_.push_back(25);
+    indexData_.push_back(26);
+    indexData_.push_back(27);
+    indexData_.push_back(28);
+    indexData_.push_back(29);
+    indexData_.push_back(30);
+    indexData_.push_back(31);
+    indexData_.push_back(32);
+    indexData_.push_back(0);
+    indexData_.push_back(2);
+    indexData_.push_back(4);
+    indexData_.push_back(6);
+    indexData_.push_back(8);
+    indexData_.push_back(10);
+    indexData_.push_back(12);
+    indexData_.push_back(14);
+    indexData_.push_back(16);
+    indexData_.push_back(18);
+    indexData_.push_back(20);
+    indexData_.push_back(22);
+    indexData_.push_back(24);
+    indexData_.push_back(26);
+    indexData_.push_back(28);
+    indexData_.push_back(30);
+    indexData_.push_back(32);
+    indexData_.push_back(31);
+    indexData_.push_back(29);
+    indexData_.push_back(27);
+    indexData_.push_back(25);
+    indexData_.push_back(23);
+    indexData_.push_back(21);
+    indexData_.push_back(19);
+    indexData_.push_back(17);
+    indexData_.push_back(15);
+    indexData_.push_back(13);
+    indexData_.push_back(11);
+    indexData_.push_back(9);
+    indexData_.push_back(7);
+    indexData_.push_back(5);
+    indexData_.push_back(3);
+    indexData_.push_back(1);
+
+    // Primitive state so that the draw call can issue the primitives we want.
+    unsigned int curOffset(0);
+    primVec_.push_back(PrimitiveState(GL_TRIANGLE_STRIP, 33, curOffset));
+    curOffset += (33 * sizeof(unsigned short));
+    primVec_.push_back(PrimitiveState(GL_LINE_STRIP, 33, curOffset));
+}
diff --git a/src/scene-ideas/i.cc b/src/scene-ideas/i.cc
new file mode 100644
index 0000000..25e8a1e
--- /dev/null
+++ b/src/scene-ideas/i.cc
@@ -0,0 +1,116 @@
+/*
+ * Vertex position data describing the letter 'i'
+ *
+ * (c) Copyright 1993, Silicon Graphics, Inc.
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Jesse Barker
+ */
+#include "characters.h"
+
+using LibMatrix::vec2;
+
+LetterI::LetterI()
+{
+    // Vertex data...
+    vertexData_.push_back(vec2(0.548767, 9.414791));
+    vertexData_.push_back(vec2(2.795284, 9.757771));
+    vertexData_.push_back(vec2(1.457663, 9.311897));
+    vertexData_.push_back(vec2(2.503751, 9.157557));
+    vertexData_.push_back(vec2(1.714898, 8.986067));
+    vertexData_.push_back(vec2(2.109325, 7.785638));
+    vertexData_.push_back(vec2(1.286174, 7.013934));
+    vertexData_.push_back(vec2(1.800643, 6.070740));
+    vertexData_.push_back(vec2(0.994641, 5.161843));
+    vertexData_.push_back(vec2(1.783494, 4.767417));
+    vertexData_.push_back(vec2(0.943194, 4.167202));
+    vertexData_.push_back(vec2(1.852090, 4.304394));
+    vertexData_.push_back(vec2(1.063237, 3.549839));
+    vertexData_.push_back(vec2(2.023580, 3.978564));
+    vertexData_.push_back(vec2(1.406217, 3.172562));
+    vertexData_.push_back(vec2(2.315113, 3.875670));
+    vertexData_.push_back(vec2(2.006431, 3.018221));
+    vertexData_.push_back(vec2(2.812433, 3.944266));
+    vertexData_.push_back(vec2(2.726688, 3.429796));
+    vertexData_.push_back(vec2(3.258307, 4.132905));
+    vertexData_.push_back(vec2(1.989282, 10.923902));
+    vertexData_.push_back(vec2(2.778135, 12.295820));
+    vertexData_.push_back(vec2(2.966774, 11.678456));
+    vertexData_.push_back(vec2(3.687031, 12.947481));
+
+    // Index data...
+    indexData_.push_back(0);
+    indexData_.push_back(1);
+    indexData_.push_back(2);
+    indexData_.push_back(3);
+    indexData_.push_back(4);
+    indexData_.push_back(5);
+    indexData_.push_back(6);
+    indexData_.push_back(7);
+    indexData_.push_back(8);
+    indexData_.push_back(9);
+    indexData_.push_back(10);
+    indexData_.push_back(11);
+    indexData_.push_back(12);
+    indexData_.push_back(13);
+    indexData_.push_back(14);
+    indexData_.push_back(15);
+    indexData_.push_back(16);
+    indexData_.push_back(17);
+    indexData_.push_back(18);
+    indexData_.push_back(19);
+    indexData_.push_back(20);
+    indexData_.push_back(21);
+    indexData_.push_back(22);
+    indexData_.push_back(23);
+    indexData_.push_back(0);
+    indexData_.push_back(2);
+    indexData_.push_back(4);
+    indexData_.push_back(6);
+    indexData_.push_back(8);
+    indexData_.push_back(10);
+    indexData_.push_back(12);
+    indexData_.push_back(14);
+    indexData_.push_back(16);
+    indexData_.push_back(18);
+    indexData_.push_back(19);
+    indexData_.push_back(17);
+    indexData_.push_back(15);
+    indexData_.push_back(13);
+    indexData_.push_back(11);
+    indexData_.push_back(9);
+    indexData_.push_back(7);
+    indexData_.push_back(5);
+    indexData_.push_back(3);
+    indexData_.push_back(1);
+    indexData_.push_back(20);
+    indexData_.push_back(22);
+    indexData_.push_back(23);
+    indexData_.push_back(21);
+
+    // Primitive state so that the draw call can issue the primitives we want.
+    unsigned int curOffset(0);
+    primVec_.push_back(PrimitiveState(GL_TRIANGLE_STRIP, 20, curOffset));
+    curOffset += (20 * sizeof(unsigned short));
+    primVec_.push_back(PrimitiveState(GL_TRIANGLE_STRIP, 4, curOffset));
+    curOffset += (4 * sizeof(unsigned short));
+    primVec_.push_back(PrimitiveState(GL_TRIANGLE_STRIP, 20, curOffset));
+    curOffset += (20 * sizeof(unsigned short));
+    primVec_.push_back(PrimitiveState(GL_TRIANGLE_STRIP, 4, curOffset));
+}
diff --git a/src/scene-ideas/lamp.cc b/src/scene-ideas/lamp.cc
new file mode 100644
index 0000000..aaf3b10
--- /dev/null
+++ b/src/scene-ideas/lamp.cc
@@ -0,0 +1,258 @@
+/*
+ * Vertex position data describing the lamp
+ *
+ * (c) Copyright 1993, Silicon Graphics, Inc.
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Jesse Barker
+ */
+#include "lamp.h"
+#include "shader-source.h"
+#include "log.h"
+#include "scene.h"
+
+using std::string;
+using LibMatrix::vec3;
+using LibMatrix::vec4;
+using LibMatrix::Stack4;
+
+const string Lamp::modelviewName_("modelview");
+const string Lamp::projectionName_("projection");
+const string Lamp::light0PositionName_("light0Position");
+const string Lamp::light1PositionName_("light1Position");
+const string Lamp::light2PositionName_("light2Position");
+const string Lamp::vertexAttribName_("vertex");
+const string Lamp::normalAttribName_("normal");
+const string Lamp::normalMatrixName_("normalMatrix");
+
+Lamp::Lamp() :
+    valid_(false)
+{
+    vertexData_.push_back(vec3(0.000000, 0.000000, 1.000000));
+    vertexData_.push_back(vec3(0.000000, 0.000000, 1.000000));
+    vertexData_.push_back(vec3(0.000000, 0.000000, 1.000000));
+    vertexData_.push_back(vec3(0.000000, 0.000000, 1.000000));
+    vertexData_.push_back(vec3(0.000000, 0.000000, 1.000000));
+    vertexData_.push_back(vec3(0.000000, 0.000000, 1.000000));
+    vertexData_.push_back(vec3(0.000000, 0.000000, 1.000000));
+    vertexData_.push_back(vec3(0.000000, 0.000000, 1.000000));
+    vertexData_.push_back(vec3(0.000000, 0.000000, 1.000000));
+    vertexData_.push_back(vec3(0.000000, 0.000000, 1.000000));
+    vertexData_.push_back(vec3(0.000000, 0.000000, 1.000000));
+    vertexData_.push_back(vec3(0.000000, 0.000000, 1.000000));
+    vertexData_.push_back(vec3(0.000000, 0.000000, 1.000000));
+    vertexData_.push_back(vec3(0.438371, 0.000000, 0.898794));
+    vertexData_.push_back(vec3(0.379641, 0.219186, 0.898794));
+    vertexData_.push_back(vec3(0.219186, 0.379641, 0.898794));
+    vertexData_.push_back(vec3(0.000000, 0.438371, 0.898794));
+    vertexData_.push_back(vec3(-0.219186, 0.379641, 0.898794));
+    vertexData_.push_back(vec3(-0.379641, 0.219186, 0.898794));
+    vertexData_.push_back(vec3(-0.438371, 0.000000, 0.898794));
+    vertexData_.push_back(vec3(-0.379641, -0.219186, 0.898794));
+    vertexData_.push_back(vec3(-0.219186, -0.379641, 0.898794));
+    vertexData_.push_back(vec3(0.000000, -0.438371, 0.898794));
+    vertexData_.push_back(vec3(0.219186, -0.379641, 0.898794));
+    vertexData_.push_back(vec3(0.379641, -0.219186, 0.898794));
+    vertexData_.push_back(vec3(0.438371, 0.000000, 0.898794));
+    vertexData_.push_back(vec3(0.788011, 0.000000, 0.615662));
+    vertexData_.push_back(vec3(0.682437, 0.394005, 0.615662));
+    vertexData_.push_back(vec3(0.394005, 0.682437, 0.615662));
+    vertexData_.push_back(vec3(0.000000, 0.788011, 0.615662));
+    vertexData_.push_back(vec3(-0.394005, 0.682437, 0.615662));
+    vertexData_.push_back(vec3(-0.682437, 0.394005, 0.615662));
+    vertexData_.push_back(vec3(-0.788011, 0.000000, 0.615662));
+    vertexData_.push_back(vec3(-0.682437, -0.394005, 0.615662));
+    vertexData_.push_back(vec3(-0.394005, -0.682437, 0.615662));
+    vertexData_.push_back(vec3(0.000000, -0.788011, 0.615662));
+    vertexData_.push_back(vec3(0.394005, -0.682437, 0.615662));
+    vertexData_.push_back(vec3(0.682437, -0.394005, 0.615662));
+    vertexData_.push_back(vec3(0.788011, 0.000000, 0.615662));
+    vertexData_.push_back(vec3(0.978148, 0.000000, 0.207912));
+    vertexData_.push_back(vec3(0.847101, 0.489074, 0.207912));
+    vertexData_.push_back(vec3(0.489074, 0.847101, 0.207912));
+    vertexData_.push_back(vec3(0.000000, 0.978148, 0.207912));
+    vertexData_.push_back(vec3(-0.489074, 0.847101, 0.207912));
+    vertexData_.push_back(vec3(-0.847101, 0.489074, 0.207912));
+    vertexData_.push_back(vec3(-0.978148, 0.000000, 0.207912));
+    vertexData_.push_back(vec3(-0.847101, -0.489074, 0.207912));
+    vertexData_.push_back(vec3(-0.489074, -0.847101, 0.207912));
+    vertexData_.push_back(vec3(0.000000, -0.978148, 0.207912));
+    vertexData_.push_back(vec3(0.489074, -0.847101, 0.207912));
+    vertexData_.push_back(vec3(0.847101, -0.489074, 0.207912));
+    vertexData_.push_back(vec3(0.978148, 0.000000, 0.207912));
+    vertexData_.push_back(vec3(0.970296, 0.000000, -0.241922));
+    vertexData_.push_back(vec3(0.840301, 0.485148, -0.241922));
+    vertexData_.push_back(vec3(0.485148, 0.840301, -0.241922));
+    vertexData_.push_back(vec3(0.000000, 0.970296, -0.241922));
+    vertexData_.push_back(vec3(-0.485148, 0.840301, -0.241922));
+    vertexData_.push_back(vec3(-0.840301, 0.485148, -0.241922));
+    vertexData_.push_back(vec3(-0.970296, 0.000000, -0.241922));
+    vertexData_.push_back(vec3(-0.840301, -0.485148, -0.241922));
+    vertexData_.push_back(vec3(-0.485148, -0.840301, -0.241922));
+    vertexData_.push_back(vec3(0.000000, -0.970296, -0.241922));
+    vertexData_.push_back(vec3(0.485148, -0.840301, -0.241922));
+    vertexData_.push_back(vec3(0.840301, -0.485148, -0.241922));
+    vertexData_.push_back(vec3(0.970296, 0.000000, -0.241922));
+    vertexData_.push_back(vec3(0.766044, 0.000000, -0.642788));
+    vertexData_.push_back(vec3(0.663414, 0.383022, -0.642788));
+    vertexData_.push_back(vec3(0.383022, 0.663414, -0.642788));
+    vertexData_.push_back(vec3(0.000000, 0.766044, -0.642788));
+    vertexData_.push_back(vec3(-0.383022, 0.663414, -0.642788));
+    vertexData_.push_back(vec3(-0.663414, 0.383022, -0.642788));
+    vertexData_.push_back(vec3(-0.766044, 0.000000, -0.642788));
+    vertexData_.push_back(vec3(-0.663414, -0.383022, -0.642788));
+    vertexData_.push_back(vec3(-0.383022, -0.663414, -0.642788));
+    vertexData_.push_back(vec3(0.000000, -0.766044, -0.642788));
+    vertexData_.push_back(vec3(0.383022, -0.663414, -0.642788));
+    vertexData_.push_back(vec3(0.663414, -0.383022, -0.642788));
+    vertexData_.push_back(vec3(0.766044, 0.000000, -0.642788));
+
+    //
+    // The original implementation of both the logo and the lamp represented
+    // the vertex and normal data in a triply-dimensioned array of floats and
+    // all of the calls referenced double-indexed arrays of vector data.
+    // To my mind, this made the code look clunky and overly verbose.
+    // Representing the data as a STL vector of vec3 (itself a 3-float vector
+    // quantity) provides both an efficient container and allows for more
+    // concise looking code.  The slightly goofy loops (using the original 2
+    // dimensional indices to compute a single offset into the STL vector) are 
+    // a compromise to avoid rearranging the original data.
+    //
+    // - jesse 2010/10/04
+    //
+    for (unsigned int i = 0; i < 5; i++)
+    {
+        for (unsigned int j = 0; j < 13; j++)
+        {
+            indexData_.push_back(i * 13 + j);
+            indexData_.push_back((i + 1) * 13 + j);
+        }
+    }
+    unsigned int curIndex(5 * 13);
+    for (unsigned int i = 0; i < 12; i++)
+    {
+        indexData_.push_back(curIndex + i);
+    }
+}
+
+Lamp::~Lamp()
+{
+    if (valid_)
+    {
+        glDeleteBuffers(2, &bufferObjects_[0]);
+    }
+}
+
+void
+Lamp::init()
+{
+    // Make sure we don't re-initialize...
+    if (valid_)
+    {
+        return;
+    }
+
+    // Initialize shader sources from input files and create programs from them
+    // The program for handling lighting...
+    string lit_vtx_filename(GLMARK_DATA_PATH"/shaders/ideas-lamp-lit.vert");
+    string lit_frg_filename(GLMARK_DATA_PATH"/shaders/ideas-lamp-lit.frag");
+    ShaderSource lit_vtx_source(lit_vtx_filename);
+    ShaderSource lit_frg_source(lit_frg_filename);
+    if (!Scene::load_shaders_from_strings(litProgram_, lit_vtx_source.str(),
+                                          lit_frg_source.str()))
+    {
+        Log::error("No valid program for lit lamp rendering\n");
+        return;
+    }
+
+    // The simple program with no lighting...
+    string unlit_vtx_filename(GLMARK_DATA_PATH"/shaders/ideas-lamp-unlit.vert");
+    string unlit_frg_filename(GLMARK_DATA_PATH"/shaders/ideas-lamp-unlit.frag");
+    ShaderSource unlit_vtx_source(unlit_vtx_filename);
+    ShaderSource unlit_frg_source(unlit_frg_filename);
+    if (!Scene::load_shaders_from_strings(unlitProgram_, unlit_vtx_source.str(),
+                                          unlit_frg_source.str()))
+    {
+        Log::error("No valid program for unlit lamp rendering.\n");
+        return;
+    }
+
+    // We need 2 buffers for our work here.  One for the vertex data.
+    // and one for the index data.
+    glGenBuffers(2, &bufferObjects_[0]);
+
+    // First, setup the vertex data by binding the first buffer object, 
+    // allocating its data store, and filling it in with our vertex data.
+    glBindBuffer(GL_ARRAY_BUFFER, bufferObjects_[0]);
+    glBufferData(GL_ARRAY_BUFFER, vertexData_.size() * sizeof(vec3), &vertexData_.front(), GL_STATIC_DRAW);
+
+    // Now repeat for our index data.
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, bufferObjects_[1]);
+    glBufferData(GL_ELEMENT_ARRAY_BUFFER, indexData_.size() * sizeof(unsigned short), &indexData_.front(), GL_STATIC_DRAW);
+
+    // We're ready to go.
+    valid_ = true;
+}
+
+void
+Lamp::draw(Stack4& modelview, Stack4& projection, const vec4* lightPositions)
+{
+    glBindBuffer(GL_ARRAY_BUFFER, bufferObjects_[0]);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, bufferObjects_[1]);
+
+    litProgram_.start();
+    int vertexIndex(litProgram_[vertexAttribName_].location());
+    int normalIndex(litProgram_[normalAttribName_].location());
+    glVertexAttribPointer(vertexIndex, 3, GL_FLOAT, GL_FALSE, 0, 0);
+    glVertexAttribPointer(normalIndex, 3, GL_FLOAT, GL_FALSE, 0, 0);
+    glEnableVertexAttribArray(vertexIndex);
+    glEnableVertexAttribArray(normalIndex);
+    const LibMatrix::mat4& mv = modelview.getCurrent();
+    LibMatrix::mat3 normalMatrix(mv[0][0], mv[1][0], mv[2][0],
+                                 mv[0][1], mv[1][1], mv[2][1],
+                                 mv[0][2], mv[1][2], mv[2][2]);
+    normalMatrix.transpose().inverse();
+    litProgram_[normalMatrixName_] = normalMatrix;
+    litProgram_[modelviewName_] = mv;
+    litProgram_[projectionName_] = projection.getCurrent();
+    litProgram_[light0PositionName_] = lightPositions[0];
+    litProgram_[light1PositionName_] = lightPositions[1];
+    litProgram_[light2PositionName_] = lightPositions[2];
+    static const unsigned int sus(sizeof(unsigned short));
+    for (unsigned int i = 0; i < 5; i++)
+    {
+        glDrawElements(GL_TRIANGLE_STRIP, 26, GL_UNSIGNED_SHORT, reinterpret_cast<const GLvoid*>(i * 26 * sus));
+    }
+    glDisableVertexAttribArray(normalIndex);
+    glDisableVertexAttribArray(vertexIndex);
+    litProgram_.stop();
+
+    unlitProgram_.start();
+    vertexIndex = unlitProgram_[vertexAttribName_].location();
+    glVertexAttribPointer(vertexIndex, 3, GL_FLOAT, GL_FALSE, 0, 0);
+    glEnableVertexAttribArray(vertexIndex);
+    unlitProgram_[modelviewName_] = mv;
+    unlitProgram_[projectionName_] = projection.getCurrent();
+    glDrawElements(GL_TRIANGLE_FAN, 12, GL_UNSIGNED_SHORT, reinterpret_cast<const GLvoid*>(5 * 26 * sus));
+    glDisableVertexAttribArray(vertexIndex);
+    unlitProgram_.stop();
+
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
+}
diff --git a/src/scene-ideas/lamp.h b/src/scene-ideas/lamp.h
new file mode 100644
index 0000000..7253942
--- /dev/null
+++ b/src/scene-ideas/lamp.h
@@ -0,0 +1,64 @@
+/*
+ * (c) Copyright 1993, Silicon Graphics, Inc.
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Jesse Barker
+ */
+#ifndef LAMP_H_
+#define LAMP_H_
+
+#include <string>
+#include <vector>
+#include "vec.h"
+#include "stack.h"
+#include "gl-headers.h"
+#include "program.h"
+
+class Lamp
+{
+public:
+    Lamp();
+    ~Lamp();
+
+    void init();
+    bool valid() const { return valid_; }
+    void draw(LibMatrix::Stack4& modelview, LibMatrix::Stack4& projection,
+              const LibMatrix::vec4* lightPositions);
+private:    
+    Program litProgram_;
+    Program unlitProgram_;
+    std::string litVertexShader_;
+    std::string litFragmentShader_;
+    std::string unlitVertexShader_;
+    std::string unlitFragmentShader_;
+    static const std::string modelviewName_;
+    static const std::string projectionName_;
+    static const std::string light0PositionName_;
+    static const std::string light1PositionName_;
+    static const std::string light2PositionName_;
+    static const std::string vertexAttribName_;
+    static const std::string normalAttribName_;
+    static const std::string normalMatrixName_;
+    std::vector<LibMatrix::vec3> vertexData_;
+    std::vector<unsigned short> indexData_;
+    unsigned int bufferObjects_[2];
+    bool valid_;
+};
+
+#endif // LAMP_H_
diff --git a/src/scene-ideas/logo.cc b/src/scene-ideas/logo.cc
new file mode 100644
index 0000000..59158ce
--- /dev/null
+++ b/src/scene-ideas/logo.cc
@@ -0,0 +1,788 @@
+/*
+ * Vertex position data describing the old Silicon Graphics logo
+ *
+ * (c) Copyright 1993, Silicon Graphics, Inc.
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Jesse Barker
+ */
+#include "logo.h"
+#include "scene.h"
+#include "shader-source.h"
+#include "log.h"
+
+using std::string;
+using LibMatrix::vec3;
+using LibMatrix::uvec3;
+using LibMatrix::vec4;
+using LibMatrix::Stack4;
+using LibMatrix::mat4;
+
+const unsigned int SGILogo::textureResolution_(32);
+const string SGILogo::modelviewName_("modelview");
+const string SGILogo::projectionName_("projection");
+const string SGILogo::lightPositionName_("light0Position");
+const string SGILogo::logoColorName_("logoColor");
+const string SGILogo::vertexAttribName_("vertex");
+const string SGILogo::normalAttribName_("normal");
+const string SGILogo::normalMatrixName_("normalMatrix");
+
+SGILogo::SGILogo(void) :
+    normalNormalIndex_(0),
+    normalVertexIndex_(0),
+    flatVertexIndex_(0),
+    shadowVertexIndex_(0),
+    vertexIndex_(0),
+    valid_(false),
+    drawStyle_(LOGO_NORMAL)
+{
+    // Single cylinder data...
+    singleCylinderVertices_.push_back(vec3(1.000000, 0.000000, 0.000000));
+    singleCylinderVertices_.push_back(vec3(1.000000, 0.000000, 5.000000));
+    singleCylinderVertices_.push_back(vec3(0.707107, 0.707107, 0.000000));
+    singleCylinderVertices_.push_back(vec3(0.707107, 0.707107, 5.000000));
+    singleCylinderVertices_.push_back(vec3(0.000000, 1.000000, 0.000000));
+    singleCylinderVertices_.push_back(vec3(0.000000, 1.000000, 5.000000));
+    singleCylinderVertices_.push_back(vec3(-0.707107, 0.707107, 0.000000));
+    singleCylinderVertices_.push_back(vec3(-0.707107, 0.707107, 5.000000));
+    singleCylinderVertices_.push_back(vec3(-1.000000, 0.000000, 0.000000));
+    singleCylinderVertices_.push_back(vec3(-1.000000, 0.000000, 5.000000));
+    singleCylinderVertices_.push_back(vec3(-0.707107, -0.707107, 0.000000));
+    singleCylinderVertices_.push_back(vec3(-0.707107, -0.707107, 5.000000));
+    singleCylinderVertices_.push_back(vec3(0.000000, -1.000000, 0.000000));
+    singleCylinderVertices_.push_back(vec3(0.000000, -1.000000, 5.000000));
+    singleCylinderVertices_.push_back(vec3(0.707107, -0.707107, 0.000000));
+    singleCylinderVertices_.push_back(vec3(0.707107, -0.707107, 5.000000));
+    singleCylinderVertices_.push_back(vec3(1.000000, 0.000000, 0.000000));
+    singleCylinderVertices_.push_back(vec3(1.000000, 0.000000, 5.000000));
+
+    singleCylinderNormals_.push_back(vec3(1.000000, 0.000000, 0.000000));
+    singleCylinderNormals_.push_back(vec3(1.000000, 0.000000, 0.000000));
+    singleCylinderNormals_.push_back(vec3(0.707107, 0.707107, 0.000000));
+    singleCylinderNormals_.push_back(vec3(0.707107, 0.707107, 0.000000));
+    singleCylinderNormals_.push_back(vec3(0.000000, 1.000000, 0.000000));
+    singleCylinderNormals_.push_back(vec3(0.000000, 1.000000, 0.000000));
+    singleCylinderNormals_.push_back(vec3(-0.707107, 0.707107, 0.000000));
+    singleCylinderNormals_.push_back(vec3(-0.707107, 0.707107, 0.000000));
+    singleCylinderNormals_.push_back(vec3(-1.000000, 0.000000, 0.000000));
+    singleCylinderNormals_.push_back(vec3(-1.000000, 0.000000, 0.000000));
+    singleCylinderNormals_.push_back(vec3(-0.707107, -0.707107, 0.000000));
+    singleCylinderNormals_.push_back(vec3(-0.707107, -0.707107, 0.000000));
+    singleCylinderNormals_.push_back(vec3(0.000000, -1.000000, 0.000000));
+    singleCylinderNormals_.push_back(vec3(0.000000, -1.000000, 0.000000));
+    singleCylinderNormals_.push_back(vec3(0.707107, -0.707107, 0.000000));
+    singleCylinderNormals_.push_back(vec3(0.707107, -0.707107, 0.000000));
+    singleCylinderNormals_.push_back(vec3(1.000000, 0.000000, 0.000000));
+    singleCylinderNormals_.push_back(vec3(1.000000, 0.000000, 0.000000));
+
+    // Double cylinder data...
+    doubleCylinderVertices_.push_back(vec3(1.000000, 0.000000, 0.000000));
+    doubleCylinderVertices_.push_back(vec3(1.000000, 0.000000, 7.000000));
+    doubleCylinderVertices_.push_back(vec3(0.707107, 0.707107, 0.000000));
+    doubleCylinderVertices_.push_back(vec3(0.707107, 0.707107, 7.000000));
+    doubleCylinderVertices_.push_back(vec3(0.000000, 1.000000, 0.000000));
+    doubleCylinderVertices_.push_back(vec3(0.000000, 1.000000, 7.000000));
+    doubleCylinderVertices_.push_back(vec3(-0.707107, 0.707107, 0.000000));
+    doubleCylinderVertices_.push_back(vec3(-0.707107, 0.707107, 7.000000));
+    doubleCylinderVertices_.push_back(vec3(-1.000000, 0.000000, 0.000000));
+    doubleCylinderVertices_.push_back(vec3(-1.000000, 0.000000, 7.000000));
+    doubleCylinderVertices_.push_back(vec3(-0.707107, -0.707107, 0.000000));
+    doubleCylinderVertices_.push_back(vec3(-0.707107, -0.707107, 7.000000));
+    doubleCylinderVertices_.push_back(vec3(0.000000, -1.000000, 0.000000));
+    doubleCylinderVertices_.push_back(vec3(0.000000, -1.000000, 7.000000));
+    doubleCylinderVertices_.push_back(vec3(0.707107, -0.707107, 0.000000));
+    doubleCylinderVertices_.push_back(vec3(0.707107, -0.707107, 7.000000));
+    doubleCylinderVertices_.push_back(vec3(1.000000, 0.000000, 0.000000));
+    doubleCylinderVertices_.push_back(vec3(1.000000, 0.000000, 7.000000));
+
+    doubleCylinderNormals_.push_back(vec3(1.000000, 0.000000, 0.000000));
+    doubleCylinderNormals_.push_back(vec3(1.000000, 0.000000, 0.000000));
+    doubleCylinderNormals_.push_back(vec3(0.707107, 0.707107, 0.000000));
+    doubleCylinderNormals_.push_back(vec3(0.707107, 0.707107, 0.000000));
+    doubleCylinderNormals_.push_back(vec3(0.000000, 1.000000, 0.000000));
+    doubleCylinderNormals_.push_back(vec3(0.000000, 1.000000, 0.000000));
+    doubleCylinderNormals_.push_back(vec3(-0.707107, 0.707107, 0.000000));
+    doubleCylinderNormals_.push_back(vec3(-0.707107, 0.707107, 0.000000));
+    doubleCylinderNormals_.push_back(vec3(-1.000000, 0.000000, 0.000000));
+    doubleCylinderNormals_.push_back(vec3(-1.000000, 0.000000, 0.000000));
+    doubleCylinderNormals_.push_back(vec3(-0.707107, -0.707107, 0.000000));
+    doubleCylinderNormals_.push_back(vec3(-0.707107, -0.707107, 0.000000));
+    doubleCylinderNormals_.push_back(vec3(0.000000, -1.000000, 0.000000));
+    doubleCylinderNormals_.push_back(vec3(0.000000, -1.000000, 0.000000));
+    doubleCylinderNormals_.push_back(vec3(0.707107, -0.707107, 0.000000));
+    doubleCylinderNormals_.push_back(vec3(0.707107, -0.707107, 0.000000));
+    doubleCylinderNormals_.push_back(vec3(1.000000, 0.000000, 0.000000));
+    doubleCylinderNormals_.push_back(vec3(1.000000, 0.000000, 0.000000));
+
+    // Elbow data...
+    elbowVertices_.push_back(vec3(1.000000, 0.000000, 0.000000));
+    elbowVertices_.push_back(vec3(0.707107, 0.707107, 0.000000));
+    elbowVertices_.push_back(vec3(0.000000, 1.000000, 0.000000));
+    elbowVertices_.push_back(vec3(-0.707107, 0.707107, 0.000000));
+    elbowVertices_.push_back(vec3(-1.000000, 0.000000, 0.000000));
+    elbowVertices_.push_back(vec3(-0.707107, -0.707107, 0.000000));
+    elbowVertices_.push_back(vec3(0.000000, -1.000000, 0.000000));
+    elbowVertices_.push_back(vec3(0.707107, -0.707107, 0.000000));
+    elbowVertices_.push_back(vec3(1.000000, 0.000000, 0.000000));
+    elbowVertices_.push_back(vec3(1.000000, 0.034074, 0.258819));
+    elbowVertices_.push_back(vec3(0.707107, 0.717087, 0.075806));
+    elbowVertices_.push_back(vec3(0.000000, 1.000000, 0.000000));
+    elbowVertices_.push_back(vec3(-0.707107, 0.717087, 0.075806));
+    elbowVertices_.push_back(vec3(-1.000000, 0.034074, 0.258819));
+    elbowVertices_.push_back(vec3(-0.707107, -0.648939, 0.441832));
+    elbowVertices_.push_back(vec3(0.000000, -0.931852, 0.517638));
+    elbowVertices_.push_back(vec3(0.707107, -0.648939, 0.441832));
+    elbowVertices_.push_back(vec3(1.000000, 0.034074, 0.258819));
+    elbowVertices_.push_back(vec3(1.000000, 0.133975, 0.500000));
+    elbowVertices_.push_back(vec3(0.707107, 0.746347, 0.146447));
+    elbowVertices_.push_back(vec3(0.000000, 1.000000, 0.000000));
+    elbowVertices_.push_back(vec3(-0.707107, 0.746347, 0.146447));
+    elbowVertices_.push_back(vec3(-1.000000, 0.133975, 0.500000));
+    elbowVertices_.push_back(vec3(-0.707107, -0.478398, 0.853553));
+    elbowVertices_.push_back(vec3(0.000000, -0.732051, 1.000000));
+    elbowVertices_.push_back(vec3(0.707107, -0.478398, 0.853553));
+    elbowVertices_.push_back(vec3(1.000000, 0.133975, 0.500000));
+    elbowVertices_.push_back(vec3(1.000000, 0.292893, 0.707107));
+    elbowVertices_.push_back(vec3(0.707107, 0.792893, 0.207107));
+    elbowVertices_.push_back(vec3(0.000000, 1.000000, 0.000000));
+    elbowVertices_.push_back(vec3(-0.707107, 0.792893, 0.207107));
+    elbowVertices_.push_back(vec3(-1.000000, 0.292893, 0.707107));
+    elbowVertices_.push_back(vec3(-0.707107, -0.207107, 1.207107));
+    elbowVertices_.push_back(vec3(0.000000, -0.414214, 1.414214));
+    elbowVertices_.push_back(vec3(0.707107, -0.207107, 1.207107));
+    elbowVertices_.push_back(vec3(1.000000, 0.292893, 0.707107));
+    elbowVertices_.push_back(vec3(1.000000, 0.500000, 0.866025));
+    elbowVertices_.push_back(vec3(0.707107, 0.853553, 0.253653));
+    elbowVertices_.push_back(vec3(0.000000, 1.000000, 0.000000));
+    elbowVertices_.push_back(vec3(-0.707107, 0.853553, 0.253653));
+    elbowVertices_.push_back(vec3(-1.000000, 0.500000, 0.866025));
+    elbowVertices_.push_back(vec3(-0.707107, 0.146447, 1.478398));
+    elbowVertices_.push_back(vec3(0.000000, 0.000000, 1.732051));
+    elbowVertices_.push_back(vec3(0.707107, 0.146447, 1.478398));
+    elbowVertices_.push_back(vec3(1.000000, 0.500000, 0.866025));
+    elbowVertices_.push_back(vec3(1.000000, 0.741181, 0.965926));
+    elbowVertices_.push_back(vec3(0.707107, 0.924194, 0.282913));
+    elbowVertices_.push_back(vec3(0.000000, 1.000000, 0.000000));
+    elbowVertices_.push_back(vec3(-0.707107, 0.924194, 0.282913));
+    elbowVertices_.push_back(vec3(-1.000000, 0.741181, 0.965926));
+    elbowVertices_.push_back(vec3(-0.707107, 0.558168, 1.648939));
+    elbowVertices_.push_back(vec3(0.000000, 0.482362, 1.931852));
+    elbowVertices_.push_back(vec3(0.707107, 0.558168, 1.648939));
+    elbowVertices_.push_back(vec3(1.000000, 0.741181, 0.965926));
+    elbowVertices_.push_back(vec3(1.000000, 1.000000, 1.000000));
+    elbowVertices_.push_back(vec3(0.707107, 1.000000, 0.292893));
+    elbowVertices_.push_back(vec3(0.000000, 1.000000, 0.000000));
+    elbowVertices_.push_back(vec3(-0.707107, 1.000000, 0.292893));
+    elbowVertices_.push_back(vec3(-1.000000, 1.000000, 1.000000));
+    elbowVertices_.push_back(vec3(-0.707107, 1.000000, 1.707107));
+    elbowVertices_.push_back(vec3(0.000000, 1.000000, 2.000000));
+    elbowVertices_.push_back(vec3(0.707107, 1.000000, 1.707107));
+    elbowVertices_.push_back(vec3(1.000000, 1.000000, 1.000000));
+
+    elbowNormals_.push_back(vec3(1.000000, 0.000000, 0.000000));
+    elbowNormals_.push_back(vec3(0.707107, 0.707107, 0.000000));
+    elbowNormals_.push_back(vec3(0.000000, 1.000000, 0.000000));
+    elbowNormals_.push_back(vec3(-0.707107, 0.707107, 0.000000));
+    elbowNormals_.push_back(vec3(-1.000000, 0.000000, 0.000000));
+    elbowNormals_.push_back(vec3(-0.707107, -0.707107, 0.000000));
+    elbowNormals_.push_back(vec3(0.000000, -1.000000, 0.000000));
+    elbowNormals_.push_back(vec3(0.707107, -0.707107, 0.000000));
+    elbowNormals_.push_back(vec3(1.000000, 0.000000, 0.000000));
+    elbowNormals_.push_back(vec3(1.000000, 0.000000, 0.000000));
+    elbowNormals_.push_back(vec3(0.707107, 0.683013, -0.183013));
+    elbowNormals_.push_back(vec3(0.000000, 0.965926, -0.258819));
+    elbowNormals_.push_back(vec3(-0.707107, 0.683013, -0.183013));
+    elbowNormals_.push_back(vec3(-1.000000, 0.000000, 0.000000));
+    elbowNormals_.push_back(vec3(-0.707107, -0.683013, 0.183013));
+    elbowNormals_.push_back(vec3(0.000000, -0.965926, 0.258819));
+    elbowNormals_.push_back(vec3(0.707107, -0.683013, 0.183013));
+    elbowNormals_.push_back(vec3(1.000000, 0.000000, 0.000000));
+    elbowNormals_.push_back(vec3(1.000000, 0.000000, 0.000000));
+    elbowNormals_.push_back(vec3(0.707107, 0.612372, -0.353553));
+    elbowNormals_.push_back(vec3(0.000000, 0.866025, -0.500000));
+    elbowNormals_.push_back(vec3(-0.707107, 0.612372, -0.353553));
+    elbowNormals_.push_back(vec3(-1.000000, 0.000000, 0.000000));
+    elbowNormals_.push_back(vec3(-0.707107, -0.612372, 0.353553));
+    elbowNormals_.push_back(vec3(0.000000, -0.866025, 0.500000));
+    elbowNormals_.push_back(vec3(0.707107, -0.612372, 0.353553));
+    elbowNormals_.push_back(vec3(1.000000, 0.000000, 0.000000));
+    elbowNormals_.push_back(vec3(1.000000, 0.000000, 0.000000));
+    elbowNormals_.push_back(vec3(0.707107, 0.500000, -0.500000));
+    elbowNormals_.push_back(vec3(0.000000, 0.707107, -0.707107));
+    elbowNormals_.push_back(vec3(-0.707107, 0.500000, -0.500000));
+    elbowNormals_.push_back(vec3(-1.000000, 0.000000, 0.000000));
+    elbowNormals_.push_back(vec3(-0.707107, -0.500000, 0.500000));
+    elbowNormals_.push_back(vec3(0.000000, -0.707107, 0.707107));
+    elbowNormals_.push_back(vec3(0.707107, -0.500000, 0.500000));
+    elbowNormals_.push_back(vec3(1.000000, 0.000000, 0.000000));
+    elbowNormals_.push_back(vec3(1.000000, 0.000000, 0.000000));
+    elbowNormals_.push_back(vec3(0.707107, 0.353553, -0.612372));
+    elbowNormals_.push_back(vec3(0.000000, 0.500000, -0.866025));
+    elbowNormals_.push_back(vec3(-0.707107, 0.353553, -0.612372));
+    elbowNormals_.push_back(vec3(-1.000000, 0.000000, 0.000000));
+    elbowNormals_.push_back(vec3(-0.707107, -0.353553, 0.612372));
+    elbowNormals_.push_back(vec3(0.000000, -0.500000, 0.866025));
+    elbowNormals_.push_back(vec3(0.707107, -0.353553, 0.612372));
+    elbowNormals_.push_back(vec3(1.000000, 0.000000, 0.000000));
+    elbowNormals_.push_back(vec3(1.000000, 0.000000, 0.000000));
+    elbowNormals_.push_back(vec3(0.707107, 0.183013, -0.683013));
+    elbowNormals_.push_back(vec3(0.000000, 0.258819, -0.965926));
+    elbowNormals_.push_back(vec3(-0.707107, 0.183013, -0.683013));
+    elbowNormals_.push_back(vec3(-1.000000, 0.000000, 0.000000));
+    elbowNormals_.push_back(vec3(-0.707107, -0.183013, 0.683013));
+    elbowNormals_.push_back(vec3(0.000000, -0.258819, 0.965926));
+    elbowNormals_.push_back(vec3(0.707107, -0.183013, 0.683013));
+    elbowNormals_.push_back(vec3(1.000000, 0.000000, 0.000000));
+    elbowNormals_.push_back(vec3(1.000000, 0.000000, 0.000000));
+    elbowNormals_.push_back(vec3(0.707107, 0.000000, -0.707107));
+    elbowNormals_.push_back(vec3(0.000000, 0.000000, -1.000000));
+    elbowNormals_.push_back(vec3(-0.707107, 0.000000, -0.707107));
+    elbowNormals_.push_back(vec3(-1.000000, 0.000000, 0.000000));
+    elbowNormals_.push_back(vec3(-0.707107, 0.000000, 0.707107));
+    elbowNormals_.push_back(vec3(0.000000, 0.000000, 1.000000));
+    elbowNormals_.push_back(vec3(0.707107, 0.000000, 0.707107));
+    elbowNormals_.push_back(vec3(1.000000, 0.000000, 0.000000));
+
+    elbowShadowVertices_.push_back(vec3(1.000000, 0.000000, 0.000000));
+    elbowShadowVertices_.push_back(vec3(0.707107, 0.707107, 0.000000));
+    elbowShadowVertices_.push_back(vec3(0.000000, 1.000000, 0.000000));
+    elbowShadowVertices_.push_back(vec3(-0.707107, 0.707107, 0.000000));
+    elbowShadowVertices_.push_back(vec3(-1.000000, 0.000000, 0.000000));
+    elbowShadowVertices_.push_back(vec3(-0.707107, -0.707107, 0.000000));
+    elbowShadowVertices_.push_back(vec3(0.000000, -1.000000, 0.000000));
+    elbowShadowVertices_.push_back(vec3(0.707107, -0.707107, 0.000000));
+    elbowShadowVertices_.push_back(vec3(1.000000, 0.000000, 0.000000));
+    elbowShadowVertices_.push_back(vec3(1.000000, 0.019215, 0.195090));
+    elbowShadowVertices_.push_back(vec3(0.707107, 0.712735, 0.057141));
+    elbowShadowVertices_.push_back(vec3(0.000000, 1.000000, 0.000000));
+    elbowShadowVertices_.push_back(vec3(-0.707107, 0.712735, 0.057141));
+    elbowShadowVertices_.push_back(vec3(-1.000000, 0.019215, 0.195090));
+    elbowShadowVertices_.push_back(vec3(-0.707107, -0.674305, 0.333040));
+    elbowShadowVertices_.push_back(vec3(0.000000, -0.961571, 0.390181));
+    elbowShadowVertices_.push_back(vec3(0.707107, -0.674305, 0.333040));
+    elbowShadowVertices_.push_back(vec3(1.000000, 0.019215, 0.195090));
+    elbowShadowVertices_.push_back(vec3(1.000000, 0.076120, 0.382683));
+    elbowShadowVertices_.push_back(vec3(0.707107, 0.729402, 0.112085));
+    elbowShadowVertices_.push_back(vec3(0.000000, 1.000000, 0.000000));
+    elbowShadowVertices_.push_back(vec3(-0.707107, 0.729402, 0.112085));
+    elbowShadowVertices_.push_back(vec3(-1.000000, 0.076120, 0.382683));
+    elbowShadowVertices_.push_back(vec3(-0.707107, -0.577161, 0.653282));
+    elbowShadowVertices_.push_back(vec3(0.000000, -0.847759, 0.765367));
+    elbowShadowVertices_.push_back(vec3(0.707107, -0.577161, 0.653282));
+    elbowShadowVertices_.push_back(vec3(1.000000, 0.076120, 0.382683));
+    elbowShadowVertices_.push_back(vec3(1.000000, 0.168530, 0.555570));
+    elbowShadowVertices_.push_back(vec3(0.707107, 0.756468, 0.162723));
+    elbowShadowVertices_.push_back(vec3(0.000000, 1.000000, 0.000000));
+    elbowShadowVertices_.push_back(vec3(-0.707107, 0.756468, 0.162723));
+    elbowShadowVertices_.push_back(vec3(-1.000000, 0.168530, 0.555570));
+    elbowShadowVertices_.push_back(vec3(-0.707107, -0.419407, 0.948418));
+    elbowShadowVertices_.push_back(vec3(0.000000, -0.662939, 1.111140));
+    elbowShadowVertices_.push_back(vec3(0.707107, -0.419407, 0.948418));
+    elbowShadowVertices_.push_back(vec3(1.000000, 0.168530, 0.555570));
+    elbowShadowVertices_.push_back(vec3(1.000000, 0.292893, 0.707107));
+    elbowShadowVertices_.push_back(vec3(0.707107, 0.792893, 0.207107));
+    elbowShadowVertices_.push_back(vec3(0.000000, 1.000000, 0.000000));
+    elbowShadowVertices_.push_back(vec3(-0.707107, 0.792893, 0.207107));
+    elbowShadowVertices_.push_back(vec3(-1.000000, 0.292893, 0.707107));
+    elbowShadowVertices_.push_back(vec3(-0.707107, -0.207107, 1.207107));
+    elbowShadowVertices_.push_back(vec3(0.000000, -0.414214, 1.414214));
+    elbowShadowVertices_.push_back(vec3(0.707107, -0.207107, 1.207107));
+    elbowShadowVertices_.push_back(vec3(1.000000, 0.292893, 0.707107));
+    elbowShadowVertices_.push_back(vec3(1.000000, 0.444430, 0.831470));
+    elbowShadowVertices_.push_back(vec3(0.707107, 0.837277, 0.243532));
+    elbowShadowVertices_.push_back(vec3(0.000000, 1.000000, 0.000000));
+    elbowShadowVertices_.push_back(vec3(-0.707107, 0.837277, 0.243532));
+    elbowShadowVertices_.push_back(vec3(-1.000000, 0.444430, 0.831470));
+    elbowShadowVertices_.push_back(vec3(-0.707107, 0.051582, 1.419407));
+    elbowShadowVertices_.push_back(vec3(0.000000, -0.111140, 1.662939));
+    elbowShadowVertices_.push_back(vec3(0.707107, 0.051582, 1.419407));
+    elbowShadowVertices_.push_back(vec3(1.000000, 0.444430, 0.831470));
+    elbowShadowVertices_.push_back(vec3(1.000000, 0.617317, 0.923880));
+    elbowShadowVertices_.push_back(vec3(0.707107, 0.887915, 0.270598));
+    elbowShadowVertices_.push_back(vec3(0.000000, 1.000000, 0.000000));
+    elbowShadowVertices_.push_back(vec3(-0.707107, 0.887915, 0.270598));
+    elbowShadowVertices_.push_back(vec3(-1.000000, 0.617317, 0.923880));
+    elbowShadowVertices_.push_back(vec3(-0.707107, 0.346719, 1.577161));
+    elbowShadowVertices_.push_back(vec3(0.000000, 0.234633, 1.847759));
+    elbowShadowVertices_.push_back(vec3(0.707107, 0.346719, 1.577161));
+    elbowShadowVertices_.push_back(vec3(1.000000, 0.617317, 0.923880));
+    elbowShadowVertices_.push_back(vec3(1.000000, 0.804910, 0.980785));
+    elbowShadowVertices_.push_back(vec3(0.707107, 0.942859, 0.287265));
+    elbowShadowVertices_.push_back(vec3(0.000000, 1.000000, 0.000000));
+    elbowShadowVertices_.push_back(vec3(-0.707107, 0.942859, 0.287265));
+    elbowShadowVertices_.push_back(vec3(-1.000000, 0.804910, 0.980785));
+    elbowShadowVertices_.push_back(vec3(-0.707107, 0.666960, 1.674305));
+    elbowShadowVertices_.push_back(vec3(0.000000, 0.609819, 1.961571));
+    elbowShadowVertices_.push_back(vec3(0.707107, 0.666960, 1.674305));
+    elbowShadowVertices_.push_back(vec3(1.000000, 0.804910, 0.980785));
+    elbowShadowVertices_.push_back(vec3(1.000000, 1.000000, 1.000000));
+    elbowShadowVertices_.push_back(vec3(0.707107, 1.000000, 0.292893));
+    elbowShadowVertices_.push_back(vec3(0.000000, 1.000000, 0.000000));
+    elbowShadowVertices_.push_back(vec3(-0.707107, 1.000000, 0.292893));
+    elbowShadowVertices_.push_back(vec3(-1.000000, 1.000000, 1.000000));
+    elbowShadowVertices_.push_back(vec3(-0.707107, 1.000000, 1.707107));
+    elbowShadowVertices_.push_back(vec3(0.000000, 1.000000, 2.000000));
+    elbowShadowVertices_.push_back(vec3(0.707107, 1.000000, 1.707107));
+    elbowShadowVertices_.push_back(vec3(1.000000, 1.000000, 1.000000));
+
+    // Now that we've setup the vertex data, we can setup the map of how
+    // that data will be laid out in the buffer object.
+    static const unsigned int sv3(sizeof(vec3));
+    dataMap_.scvOffset = 0;
+    dataMap_.scvSize = singleCylinderVertices_.size() * sv3;
+    dataMap_.totalSize = dataMap_.scvSize;
+    dataMap_.scnOffset = dataMap_.scvOffset + dataMap_.scvSize;
+    dataMap_.scnSize = singleCylinderNormals_.size() * sv3;
+    dataMap_.totalSize += dataMap_.scnSize;
+    dataMap_.dcvOffset = dataMap_.scnOffset + dataMap_.scnSize;
+    dataMap_.dcvSize = doubleCylinderVertices_.size() * sv3;
+    dataMap_.totalSize += dataMap_.dcvSize;
+    dataMap_.dcnOffset = dataMap_.dcvOffset + dataMap_.dcvSize;
+    dataMap_.dcnSize = doubleCylinderNormals_.size() * sv3;
+    dataMap_.totalSize += dataMap_.dcnSize;
+    dataMap_.evOffset = dataMap_.dcnOffset + dataMap_.dcnSize;
+    dataMap_.evSize = elbowVertices_.size() * sv3;
+    dataMap_.totalSize += dataMap_.evSize;
+    dataMap_.enOffset = dataMap_.evOffset + dataMap_.evSize;
+    dataMap_.enSize = elbowNormals_.size() * sv3;
+    dataMap_.totalSize += dataMap_.enSize;
+    dataMap_.esvOffset = dataMap_.enOffset + dataMap_.enSize;
+    dataMap_.esvSize = elbowShadowVertices_.size() * sv3;
+    dataMap_.totalSize += dataMap_.esvSize;
+
+    //
+    // The original implementation of both the logo and the lamp represented
+    // the vertex and normal data in a triply-dimensioned array of floats and
+    // all of the calls referenced double-indexed arrays of vector data.
+    // To my mind, this made the code look clunky and overly verbose.
+    // Representing the data as a STL vector of vec3 (itself a 3-float vector
+    // quantity) provides both an efficient container and allows for more
+    // concise looking code.  The slightly goofy loops (using the original 2
+    // dimensional indices to compute a single offset into the STL vector) are 
+    // a compromise to avoid rearranging the original data.
+    //
+    // - jesse 2010/10/04
+    //
+    for (unsigned int i = 0; i < 8; i++)
+    {
+        for (unsigned int j = 0; j < 9; j++)
+        {
+            unsigned int index1(i * 9 + j);
+            unsigned int index2((i + 1) * 9 + j);
+            indexData_.push_back(index1);
+            indexData_.push_back(index2);
+        }
+    }
+
+    // Initialize the stipple pattern
+    static const unsigned int patterns[] = { 0xaaaaaaaa, 0x55555555 };
+    for (unsigned int i = 0; i < textureResolution_; i++)
+    {
+        for (unsigned int j = 0; j < textureResolution_; j++)
+        {
+            // Alternate the pattern every other line.
+            unsigned int curMask(1 << j);
+            unsigned int curPattern(patterns[i % 2]);
+            textureImage_[i][j] = ((curPattern & curMask) >> j) * 255;
+        }
+    }
+}
+
+SGILogo::~SGILogo()
+{
+    if (valid_)
+    {
+        glDeleteBuffers(2, &bufferObjects_[0]);
+    }
+}
+
+void
+SGILogo::init()
+{
+    // Make sure we don't re-initialize...
+    if (valid_)
+    {
+        return;
+    }
+
+    // Initialize shader sources from input files and create programs from them
+    // The program for handling the main object with lighting...
+    string logo_vtx_filename(GLMARK_DATA_PATH"/shaders/ideas-logo.vert");
+    string logo_frg_filename(GLMARK_DATA_PATH"/shaders/ideas-logo.frag");
+    ShaderSource logo_vtx_source(logo_vtx_filename);
+    ShaderSource logo_frg_source(logo_frg_filename);
+    if (!Scene::load_shaders_from_strings(normalProgram_, logo_vtx_source.str(),
+                                          logo_frg_source.str()))
+    {
+        Log::error("No valid program for normal logo rendering\n");
+        return;
+    }
+    normalVertexIndex_ = normalProgram_[vertexAttribName_].location();
+    normalNormalIndex_ = normalProgram_[normalAttribName_].location();
+
+    // The program for handling the flat object...
+    string logo_flat_vtx_filename(GLMARK_DATA_PATH"/shaders/ideas-logo-flat.vert");
+    string logo_flat_frg_filename(GLMARK_DATA_PATH"/shaders/ideas-logo-flat.frag");
+    ShaderSource logo_flat_vtx_source(logo_flat_vtx_filename);
+    ShaderSource logo_flat_frg_source(logo_flat_frg_filename);
+    if (!Scene::load_shaders_from_strings(flatProgram_, logo_flat_vtx_source.str(),
+                                          logo_flat_frg_source.str()))
+    {
+        Log::error("No valid program for flat logo rendering\n");
+        return;
+    }
+    flatVertexIndex_ = flatProgram_[vertexAttribName_].location();
+
+    // The program for handling the shadow object with texturing...
+    string logo_shadow_vtx_filename(GLMARK_DATA_PATH"/shaders/ideas-logo-shadow.vert");
+    string logo_shadow_frg_filename(GLMARK_DATA_PATH"/shaders/ideas-logo-shadow.frag");
+    ShaderSource logo_shadow_vtx_source(logo_shadow_vtx_filename);
+    ShaderSource logo_shadow_frg_source(logo_shadow_frg_filename);
+    if (!Scene::load_shaders_from_strings(shadowProgram_, logo_shadow_vtx_source.str(),
+                                          logo_shadow_frg_source.str()))
+    {
+        Log::error("No valid program for shadow logo rendering\n");
+        return;
+    }
+    shadowVertexIndex_ = shadowProgram_[vertexAttribName_].location();
+
+    // We need 2 buffers for our work here.  One for the vertex data.
+    // and one for the index data.
+    glGenBuffers(2, &bufferObjects_[0]);
+
+    // First, setup the vertex data by binding the first buffer object, 
+    // allocating its data store, and filling it in with our vertex data.
+    glBindBuffer(GL_ARRAY_BUFFER, bufferObjects_[0]);
+    glBufferData(GL_ARRAY_BUFFER, dataMap_.totalSize, 0, GL_STATIC_DRAW);
+    glBufferSubData(GL_ARRAY_BUFFER, dataMap_.scvOffset, dataMap_.scvSize,
+                    &singleCylinderVertices_.front());
+    glBufferSubData(GL_ARRAY_BUFFER, dataMap_.scnOffset, dataMap_.scnSize,
+                    &singleCylinderNormals_.front());
+    glBufferSubData(GL_ARRAY_BUFFER, dataMap_.dcvOffset, dataMap_.dcvSize,
+                    &doubleCylinderVertices_.front());
+    glBufferSubData(GL_ARRAY_BUFFER, dataMap_.dcnOffset, dataMap_.dcnSize,
+                    &doubleCylinderNormals_.front());
+    glBufferSubData(GL_ARRAY_BUFFER, dataMap_.evOffset, dataMap_.evSize,
+                    &elbowVertices_.front());
+    glBufferSubData(GL_ARRAY_BUFFER, dataMap_.enOffset, dataMap_.enSize, 
+                    &elbowNormals_.front());
+    glBufferSubData(GL_ARRAY_BUFFER, dataMap_.esvOffset, dataMap_.esvSize, 
+                    &elbowShadowVertices_.front());
+
+    // Now repeat for our index data.
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, bufferObjects_[1]);
+    glBufferData(GL_ELEMENT_ARRAY_BUFFER, indexData_.size() * sizeof(unsigned short),
+                 &indexData_.front(), GL_STATIC_DRAW);
+
+    // Setup our the texture that the shadow program will use...
+    glGenTextures(1, &textureName_);
+    glBindTexture(GL_TEXTURE_2D, textureName_);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA,
+                 textureResolution_, textureResolution_,
+                 0, GL_ALPHA, GL_UNSIGNED_BYTE, textureImage_);
+
+    // We're ready to go.
+    valid_ = true;
+}
+
+void
+SGILogo::bendForward(Stack4& ms)
+{
+    ms.translate(0.0, 1.0, 0.0);
+    ms.rotate(90.0, 1.0, 0.0, 0.0);
+    ms.translate(0.0, -1.0, 0.0);
+}
+
+void
+SGILogo::bendLeft(Stack4& ms)
+{
+    ms.rotate(-90.0, 0.0, 0.0, 1.0);
+    ms.translate(0.0, 1.0, 0.0);
+    ms.rotate(90.0, 1.0, 0.0, 0.0);
+    ms.translate(0.0, -1.0, 0.0);
+}
+
+void
+SGILogo::bendRight(Stack4& ms) 
+{
+    ms.rotate(90.0, 0.0, 0.0, 1.0);
+    ms.translate(0.0, 1.0, 0.0);
+    ms.rotate(90.0, 1.0, 0.0, 0.0);
+    ms.translate(0.0, -1.0, 0.0);
+}
+
+void
+SGILogo::drawDoubleCylinder(void)
+{
+    glVertexAttribPointer(vertexIndex_, 3, GL_FLOAT, GL_FALSE, 0, 
+        reinterpret_cast<const GLvoid*>(dataMap_.dcvOffset));
+    if (drawStyle_ == LOGO_NORMAL)
+    {
+        glVertexAttribPointer(normalNormalIndex_, 3, GL_FLOAT, GL_FALSE, 0, 
+            reinterpret_cast<const GLvoid*>(dataMap_.dcnOffset));
+    }
+    glDrawArrays(GL_TRIANGLE_STRIP, 0, 18);
+}
+
+void
+SGILogo::drawSingleCylinder(void)
+{
+    glVertexAttribPointer(vertexIndex_, 3, GL_FLOAT, GL_FALSE, 0,
+        reinterpret_cast<const GLvoid*>(dataMap_.scvOffset));
+    if (drawStyle_ == LOGO_NORMAL)
+    {
+        glVertexAttribPointer(normalNormalIndex_, 3, GL_FLOAT, GL_FALSE, 0, 
+            reinterpret_cast<const GLvoid*>(dataMap_.scnOffset));
+    }
+    glDrawArrays(GL_TRIANGLE_STRIP, 0, 18);
+}
+
+void
+SGILogo::drawElbow(void)
+{
+    unsigned int startIdx(0);
+    unsigned int endIdx(6);
+    if (drawStyle_ == LOGO_NORMAL)
+    {
+        glVertexAttribPointer(vertexIndex_, 3, GL_FLOAT, GL_FALSE, 0,
+            reinterpret_cast<const GLvoid*>(dataMap_.evOffset));
+        glVertexAttribPointer(normalNormalIndex_, 3, GL_FLOAT, GL_FALSE, 0,
+            reinterpret_cast<const GLvoid*>(dataMap_.enOffset));
+    }
+    else
+    {
+        endIdx = 8;
+        glVertexAttribPointer(vertexIndex_, 3, GL_FLOAT, GL_FALSE, 0,
+            reinterpret_cast<const GLvoid*>(dataMap_.esvOffset));
+    }
+
+    for (unsigned int i = startIdx; i < endIdx; i++)
+    {
+        unsigned int curOffset(i * 18 * sizeof(unsigned short));
+        glDrawElements(GL_TRIANGLE_STRIP, 18, GL_UNSIGNED_SHORT, 
+             reinterpret_cast<const GLvoid*>(curOffset));
+    }
+}
+
+// Generate a normal matrix from a modelview matrix
+//
+// Since we can't universally handle the normal matrix inside the
+// vertex shader (inverse() and transpose() built-ins not supported by
+// GLSL ES, for example), we'll generate it here, and load it as a
+// uniform.
+void
+SGILogo::updateXform(const mat4& mv, Program& program)
+{
+    if (drawStyle_ == LOGO_NORMAL)
+    {
+        LibMatrix::mat3 normalMatrix(mv[0][0], mv[1][0], mv[2][0],
+                                     mv[0][1], mv[1][1], mv[2][1],
+                                     mv[0][2], mv[1][2], mv[2][2]);
+        normalMatrix.transpose().inverse();
+        program[normalMatrixName_] = normalMatrix;
+    }
+    program[modelviewName_] = mv;
+}
+
+Program&
+SGILogo::getProgram()
+{
+    switch (drawStyle_)
+    {
+        case LOGO_NORMAL:
+            return normalProgram_;
+            break;
+        case LOGO_FLAT:
+            return flatProgram_;
+            break;
+        case LOGO_SHADOW:
+            return shadowProgram_;
+            break;            
+    }
+
+    return normalProgram_;
+}
+
+void
+SGILogo::draw(Stack4& modelview, 
+    Stack4& projection, 
+    const vec4& lightPosition,
+    DrawStyle style,
+    const uvec3& currentColor)
+{
+    if (!valid_)
+    {
+        return;
+    }
+
+    glBindBuffer(GL_ARRAY_BUFFER, bufferObjects_[0]);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, bufferObjects_[1]);
+
+    // Setup the program to use based upon draw style and set it running.
+    drawStyle_ = style;
+    vec4 logoColor(currentColor.x() / 255.0, currentColor.y() / 255.0, currentColor.z() / 255.0, 1.0);
+    Program& curProgram = getProgram();
+    curProgram.start();
+    switch (drawStyle_)
+    {
+        case LOGO_NORMAL:
+            curProgram[lightPositionName_] = lightPosition;
+            vertexIndex_ = normalVertexIndex_;
+            glEnableVertexAttribArray(normalNormalIndex_);
+            break;
+        case LOGO_FLAT:
+            curProgram[logoColorName_] = logoColor;
+            vertexIndex_ = flatVertexIndex_;
+            break;
+        case LOGO_SHADOW:
+            vertexIndex_ = shadowVertexIndex_;
+            break;            
+    }
+
+    glEnableVertexAttribArray(vertexIndex_);
+    curProgram[projectionName_] = projection.getCurrent();
+    modelview.translate(5.500000, -3.500000, 4.500000);
+    modelview.translate(0.0,  0.0,  -7.000000);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawDoubleCylinder();
+    bendForward(modelview);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawElbow();
+    modelview.translate(0.0, 0.0, -7.000000);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawDoubleCylinder();
+    bendForward(modelview);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawElbow();
+    modelview.translate(0.0, 0.0, -5.000000);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawSingleCylinder();
+    bendRight(modelview);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawElbow();
+    modelview.translate(0.0, 0.0, -7.000000);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawDoubleCylinder();
+    bendForward(modelview);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawElbow();
+    modelview.translate(0.0, 0.0, -7.000000);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawDoubleCylinder();
+    bendForward(modelview);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawElbow();
+    modelview.translate(0.0, 0.0, -5.000000);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawSingleCylinder();
+    bendLeft(modelview);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawElbow();
+    modelview.translate(0.0, 0.0, -7.000000);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawDoubleCylinder();
+    bendForward(modelview);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawElbow();
+    modelview.translate(0.0, 0.0, -7.000000);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawDoubleCylinder();
+    bendForward(modelview);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawElbow();
+    modelview.translate(0.0, 0.0, -5.000000);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawSingleCylinder();
+    bendRight(modelview);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawElbow();
+    modelview.translate(0.0, 0.0, -7.000000);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawDoubleCylinder();
+    bendForward(modelview);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawElbow();
+    modelview.translate(0.0, 0.0, -7.000000);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawDoubleCylinder();
+    bendForward(modelview);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawElbow();
+    modelview.translate(0.0, 0.0, -5.000000);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawSingleCylinder();
+    bendLeft(modelview);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawElbow();
+    modelview.translate(0.0, 0.0, -7.000000);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawDoubleCylinder();
+    bendForward(modelview);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawElbow();
+    modelview.translate(0.0, 0.0, -7.000000);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawDoubleCylinder();
+    bendForward(modelview);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawElbow();
+    modelview.translate(0.0, 0.0, -5.000000);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawSingleCylinder();
+    bendRight(modelview);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawElbow();
+    modelview.translate(0.0, 0.0, -7.000000);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawDoubleCylinder();
+    bendForward(modelview);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawElbow();
+    modelview.translate(0.0, 0.0, -7.000000);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawDoubleCylinder();
+    bendForward(modelview);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawElbow();
+    modelview.translate(0.0, 0.0, -5.000000);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawSingleCylinder();
+    bendLeft(modelview);
+    updateXform(modelview.getCurrent(), curProgram);
+    drawElbow();
+    glDisableVertexAttribArray(vertexIndex_);
+    switch (drawStyle_)
+    {
+        case LOGO_NORMAL:
+            glDisableVertexAttribArray(normalNormalIndex_);
+            break;
+        case LOGO_FLAT:
+            break;
+        case LOGO_SHADOW:
+            break;            
+    }
+    curProgram.stop();
+
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
+}
diff --git a/src/scene-ideas/logo.h b/src/scene-ideas/logo.h
new file mode 100644
index 0000000..43d9fe5
--- /dev/null
+++ b/src/scene-ideas/logo.h
@@ -0,0 +1,126 @@
+/*
+ * (c) Copyright 1993, Silicon Graphics, Inc.
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Jesse Barker
+ */
+#ifndef LOGO_H_
+#define LOGO_H_
+
+#include <string>
+#include <vector>
+#include "vec.h"
+#include "stack.h"
+#include "gl-headers.h"
+#include "program.h"
+
+class SGILogo
+{
+public:
+    SGILogo();
+    ~SGILogo();
+
+    // Initialize the logo
+    void init();
+    bool valid() const { return valid_; }
+    void setPosition(const LibMatrix::vec3& position) { currentPosition_ = position; }
+    // Tell the logo to draw itself. DrawStyle tells it how.
+    // - LOGO_NORMAL renders the logo lit and shaded.
+    // - LOGO_FLAT renders the logo as if flattened onto a surface.
+    // - LOGO_SHADOW renders a stippled-looking shadow of the object.
+    enum DrawStyle
+    {
+        LOGO_NORMAL, 
+        LOGO_FLAT, 
+        LOGO_SHADOW
+    };
+    void draw(LibMatrix::Stack4& modelview, LibMatrix::Stack4& projection, 
+              const LibMatrix::vec4& lightPosition, DrawStyle style, 
+              const LibMatrix::uvec3& color = LibMatrix::uvec3());
+
+private:
+    void drawElbow();
+    void drawSingleCylinder();
+    void drawDoubleCylinder();
+    void bendLeft(LibMatrix::Stack4& ms);
+    void bendRight(LibMatrix::Stack4& ms);
+    void bendForward(LibMatrix::Stack4& ms);
+    void updateXform(const LibMatrix::mat4& mv, Program& program);
+    Program& getProgram();
+    LibMatrix::vec3 currentPosition_;
+    std::vector<LibMatrix::vec3> singleCylinderVertices_;
+    std::vector<LibMatrix::vec3> singleCylinderNormals_;
+    std::vector<LibMatrix::vec3> doubleCylinderVertices_;
+    std::vector<LibMatrix::vec3> doubleCylinderNormals_;
+    std::vector<LibMatrix::vec3> elbowVertices_;
+    std::vector<LibMatrix::vec3> elbowNormals_;
+    std::vector<LibMatrix::vec3> elbowShadowVertices_;
+    std::vector<unsigned short> indexData_;
+    // A simple map so we know where each section of our data starts within
+    // our vertex buffer object.
+    struct VertexDataMap
+    {
+        unsigned int scvOffset;
+        unsigned int scvSize;
+        unsigned int scnOffset;
+        unsigned int scnSize;
+        unsigned int dcvOffset;
+        unsigned int dcvSize;
+        unsigned int dcnOffset;
+        unsigned int dcnSize;
+        unsigned int evOffset;
+        unsigned int evSize;
+        unsigned int enOffset;
+        unsigned int enSize;
+        unsigned int esvOffset;
+        unsigned int esvSize;
+        unsigned int totalSize;
+    } dataMap_;
+    unsigned int bufferObjects_[2];
+    Program normalProgram_;
+    Program flatProgram_;
+    Program shadowProgram_;
+    std::string normalVertexShader_;
+    std::string normalFragmentShader_;
+    std::string flatVertexShader_;
+    std::string flatFragmentShader_;
+    std::string shadowVertexShader_;
+    std::string shadowFragmentShader_;
+    int normalNormalIndex_;
+    int normalVertexIndex_;
+    int flatVertexIndex_;
+    int shadowVertexIndex_;
+    int vertexIndex_;
+    static const std::string modelviewName_;
+    static const std::string projectionName_;
+    static const std::string lightPositionName_;
+    static const std::string logoColorName_;
+    static const std::string vertexAttribName_;
+    static const std::string normalAttribName_;
+    static const std::string normalMatrixName_;
+    // "Shadow" state
+    GLuint textureName_;
+    GLubyte textureImage_[32][32];
+    // This is the size in each direction of our texture image
+    static const unsigned int textureResolution_;
+    bool valid_;
+    DrawStyle drawStyle_;
+};
+
+#endif // LOGO_H_
diff --git a/src/scene-ideas/m.cc b/src/scene-ideas/m.cc
new file mode 100644
index 0000000..47bdb0d
--- /dev/null
+++ b/src/scene-ideas/m.cc
@@ -0,0 +1,210 @@
+/*
+ * Vertex position data describing the letter 'm'
+ *
+ * (c) Copyright 1993, Silicon Graphics, Inc.
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Jesse Barker
+ */
+#include "characters.h"
+
+using LibMatrix::vec2;
+
+LetterM::LetterM()
+{
+    // Vertex data...
+    vertexData_.push_back(vec2(0.590769, 9.449335));
+    vertexData_.push_back(vec2(2.116923, 9.842375));
+    vertexData_.push_back(vec2(1.362051, 9.383828));
+    vertexData_.push_back(vec2(2.527179, 9.825998));
+    vertexData_.push_back(vec2(1.591795, 9.072672));
+    vertexData_.push_back(vec2(2.789744, 9.514841));
+    vertexData_.push_back(vec2(1.690256, 8.663255));
+    vertexData_.push_back(vec2(2.658462, 8.335722));
+    vertexData_.push_back(vec2(1.575385, 7.222108));
+    vertexData_.push_back(vec2(2.067692, 6.255886));
+    vertexData_.push_back(vec2(0.918974, 4.028659));
+    vertexData_.push_back(vec2(1.050256, 3.013306));
+    vertexData_.push_back(vec2(0.705641, 3.013306));
+    vertexData_.push_back(vec2(2.018461, 6.386899));
+    vertexData_.push_back(vec2(1.788718, 5.617196));
+    vertexData_.push_back(vec2(2.921026, 7.991812));
+    vertexData_.push_back(vec2(3.167180, 8.008188));
+    vertexData_.push_back(vec2(3.544615, 8.827022));
+    vertexData_.push_back(vec2(3.872821, 8.843398));
+    vertexData_.push_back(vec2(4.414359, 9.547595));
+    vertexData_.push_back(vec2(4.447179, 9.056294));
+    vertexData_.push_back(vec2(5.120000, 9.891504));
+    vertexData_.push_back(vec2(4.841026, 8.843398));
+    vertexData_.push_back(vec2(5.825641, 9.809621));
+    vertexData_.push_back(vec2(5.005128, 8.040941));
+    vertexData_.push_back(vec2(5.989744, 8.761515));
+    vertexData_.push_back(vec2(4.906667, 6.714432));
+    vertexData_.push_back(vec2(5.595897, 7.123848));
+    vertexData_.push_back(vec2(3.987692, 2.996929));
+    vertexData_.push_back(vec2(4.348718, 2.996929));
+    vertexData_.push_back(vec2(5.218462, 5.977482));
+    vertexData_.push_back(vec2(5.251282, 6.354146));
+    vertexData_.push_back(vec2(6.449231, 7.893552));
+    vertexData_.push_back(vec2(6.400000, 8.221085));
+    vertexData_.push_back(vec2(7.302564, 8.843398));
+    vertexData_.push_back(vec2(7.351795, 9.334698));
+    vertexData_.push_back(vec2(7.827693, 9.154554));
+    vertexData_.push_back(vec2(8.008205, 9.842375));
+    vertexData_.push_back(vec2(8.139487, 9.121801));
+    vertexData_.push_back(vec2(8.795897, 9.973388));
+    vertexData_.push_back(vec2(8.402051, 8.728762));
+    vertexData_.push_back(vec2(9.337436, 9.531218));
+    vertexData_.push_back(vec2(8.402051, 8.040941));
+    vertexData_.push_back(vec2(9.288205, 8.433982));
+    vertexData_.push_back(vec2(7.745641, 5.813715));
+    vertexData_.push_back(vec2(8.320000, 5.928352));
+    vertexData_.push_back(vec2(7.286154, 4.012282));
+    vertexData_.push_back(vec2(7.991795, 4.126919));
+    vertexData_.push_back(vec2(7.499487, 3.357216));
+    vertexData_.push_back(vec2(8.533334, 3.766633));
+    vertexData_.push_back(vec2(8.123077, 3.062436));
+    vertexData_.push_back(vec2(8.927179, 3.832139));
+    vertexData_.push_back(vec2(8.910769, 3.340839));
+    vertexData_.push_back(vec2(9.550769, 4.126919));
+
+    // Index data...
+    indexData_.push_back(0);
+    indexData_.push_back(2);
+    indexData_.push_back(4);
+    indexData_.push_back(6);
+    indexData_.push_back(8);
+    indexData_.push_back(10);
+    indexData_.push_back(12);
+    indexData_.push_back(11);
+    indexData_.push_back(9);
+    indexData_.push_back(7);
+    indexData_.push_back(5);
+    indexData_.push_back(3);
+    indexData_.push_back(1);
+    indexData_.push_back(14);
+    indexData_.push_back(16);
+    indexData_.push_back(18);
+    indexData_.push_back(20);
+    indexData_.push_back(22);
+    indexData_.push_back(24);
+    indexData_.push_back(26);
+    indexData_.push_back(28);
+    indexData_.push_back(29);
+    indexData_.push_back(27);
+    indexData_.push_back(25);
+    indexData_.push_back(23);
+    indexData_.push_back(21);
+    indexData_.push_back(19);
+    indexData_.push_back(17);
+    indexData_.push_back(15);
+    indexData_.push_back(13);
+    indexData_.push_back(30);
+    indexData_.push_back(32);
+    indexData_.push_back(34);
+    indexData_.push_back(36);
+    indexData_.push_back(38);
+    indexData_.push_back(40);
+    indexData_.push_back(42);
+    indexData_.push_back(44);
+    indexData_.push_back(46);
+    indexData_.push_back(48);
+    indexData_.push_back(50);
+    indexData_.push_back(52);
+    indexData_.push_back(53);
+    indexData_.push_back(51);
+    indexData_.push_back(49);
+    indexData_.push_back(47);
+    indexData_.push_back(45);
+    indexData_.push_back(43);
+    indexData_.push_back(41);
+    indexData_.push_back(39);
+    indexData_.push_back(37);
+    indexData_.push_back(35);
+    indexData_.push_back(33);
+    indexData_.push_back(31);
+    indexData_.push_back(0);
+    indexData_.push_back(1);
+    indexData_.push_back(2);
+    indexData_.push_back(3);
+    indexData_.push_back(4);
+    indexData_.push_back(5);
+    indexData_.push_back(6);
+    indexData_.push_back(7);
+    indexData_.push_back(8);
+    indexData_.push_back(9);
+    indexData_.push_back(10);
+    indexData_.push_back(11);
+    indexData_.push_back(12);
+    indexData_.push_back(13);
+    indexData_.push_back(14);
+    indexData_.push_back(15);
+    indexData_.push_back(16);
+    indexData_.push_back(17);
+    indexData_.push_back(18);
+    indexData_.push_back(19);
+    indexData_.push_back(20);
+    indexData_.push_back(21);
+    indexData_.push_back(22);
+    indexData_.push_back(23);
+    indexData_.push_back(24);
+    indexData_.push_back(25);
+    indexData_.push_back(26);
+    indexData_.push_back(27);
+    indexData_.push_back(28);
+    indexData_.push_back(29);
+    indexData_.push_back(30);
+    indexData_.push_back(31);
+    indexData_.push_back(32);
+    indexData_.push_back(33);
+    indexData_.push_back(34);
+    indexData_.push_back(35);
+    indexData_.push_back(36);
+    indexData_.push_back(37);
+    indexData_.push_back(38);
+    indexData_.push_back(39);
+    indexData_.push_back(40);
+    indexData_.push_back(41);
+    indexData_.push_back(42);
+    indexData_.push_back(43);
+    indexData_.push_back(44);
+    indexData_.push_back(45);
+    indexData_.push_back(46);
+    indexData_.push_back(47);
+    indexData_.push_back(48);
+    indexData_.push_back(49);
+    indexData_.push_back(50);
+    indexData_.push_back(51);
+    indexData_.push_back(52);
+    indexData_.push_back(53);
+
+    // Primitive state so that the draw call can issue the primitives we want.
+    unsigned int curOffset(0);
+    primVec_.push_back(PrimitiveState(GL_LINE_STRIP, 13, curOffset));
+    curOffset += (13 * sizeof(unsigned short));
+    primVec_.push_back(PrimitiveState(GL_LINE_STRIP, 17, curOffset));
+    curOffset += (17 * sizeof(unsigned short));
+    primVec_.push_back(PrimitiveState(GL_LINE_STRIP, 24, curOffset));
+    curOffset += (24 * sizeof(unsigned short));
+    primVec_.push_back(PrimitiveState(GL_TRIANGLE_STRIP, 13, curOffset));
+    curOffset += (13 * sizeof(unsigned short));
+    primVec_.push_back(PrimitiveState(GL_TRIANGLE_STRIP, 17, curOffset));
+    curOffset += (17 * sizeof(unsigned short));
+    primVec_.push_back(PrimitiveState(GL_TRIANGLE_STRIP, 24, curOffset));
+}
diff --git a/src/scene-ideas/n.cc b/src/scene-ideas/n.cc
new file mode 100644
index 0000000..1ca7490
--- /dev/null
+++ b/src/scene-ideas/n.cc
@@ -0,0 +1,146 @@
+/*
+ * Vertex position data describing the letter 'o'
+ *
+ * (c) Copyright 1993, Silicon Graphics, Inc.
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Jesse Barker
+ */
+#include "characters.h"
+
+using LibMatrix::vec2;
+
+LetterN::LetterN()
+{
+    // Vertex data...
+    vertexData_.push_back(vec2(1.009307, 9.444788));
+    vertexData_.push_back(vec2(2.548087, 9.742002));
+    vertexData_.push_back(vec2(1.737332, 9.213622));
+    vertexData_.push_back(vec2(2.994829, 9.659443));
+    vertexData_.push_back(vec2(1.985522, 8.751290));
+    vertexData_.push_back(vec2(3.127198, 9.180598));
+    vertexData_.push_back(vec2(1.935884, 7.975232));
+    vertexData_.push_back(vec2(2.481903, 6.571723));
+    vertexData_.push_back(vec2(1.472596, 5.019608));
+    vertexData_.push_back(vec2(1.439504, 2.988648));
+    vertexData_.push_back(vec2(1.025853, 2.988648));
+    vertexData_.push_back(vec2(2.283350, 6.059855));
+    vertexData_.push_back(vec2(2.035160, 5.366357));
+    vertexData_.push_back(vec2(3.292658, 7.711042));
+    vertexData_.push_back(vec2(3.540848, 7.744066));
+    vertexData_.push_back(vec2(4.384695, 9.031992));
+    vertexData_.push_back(vec2(4.699069, 8.916409));
+    vertexData_.push_back(vec2(5.609100, 9.808049));
+    vertexData_.push_back(vec2(5.145812, 8.982456));
+    vertexData_.push_back(vec2(6.155119, 9.791537));
+    vertexData_.push_back(vec2(5.410548, 8.635707));
+    vertexData_.push_back(vec2(6.337125, 9.312694));
+    vertexData_.push_back(vec2(5.360910, 7.991744));
+    vertexData_.push_back(vec2(6.088935, 8.090816));
+    vertexData_.push_back(vec2(4.947259, 5.977296));
+    vertexData_.push_back(vec2(5.261634, 4.804954));
+    vertexData_.push_back(vec2(4.616339, 4.028896));
+    vertexData_.push_back(vec2(5.211996, 3.962848));
+    vertexData_.push_back(vec2(4.732162, 3.318886));
+    vertexData_.push_back(vec2(5.559462, 3.814241));
+    vertexData_.push_back(vec2(5.228542, 3.038184));
+    vertexData_.push_back(vec2(5.940021, 3.814241));
+    vertexData_.push_back(vec2(5.906929, 3.335397));
+    vertexData_.push_back(vec2(6.684591, 4.094943));
+
+    // Index data...
+    indexData_.push_back(0);
+    indexData_.push_back(1);
+    indexData_.push_back(2);
+    indexData_.push_back(3);
+    indexData_.push_back(4);
+    indexData_.push_back(5);
+    indexData_.push_back(6);
+    indexData_.push_back(7);
+    indexData_.push_back(8);
+    indexData_.push_back(9);
+    indexData_.push_back(10);
+    indexData_.push_back(11);
+    indexData_.push_back(12);
+    indexData_.push_back(13);
+    indexData_.push_back(14);
+    indexData_.push_back(15);
+    indexData_.push_back(16);
+    indexData_.push_back(17);
+    indexData_.push_back(18);
+    indexData_.push_back(19);
+    indexData_.push_back(20);
+    indexData_.push_back(21);
+    indexData_.push_back(22);
+    indexData_.push_back(23);
+    indexData_.push_back(24);
+    indexData_.push_back(25);
+    indexData_.push_back(26);
+    indexData_.push_back(27);
+    indexData_.push_back(28);
+    indexData_.push_back(29);
+    indexData_.push_back(30);
+    indexData_.push_back(31);
+    indexData_.push_back(32);
+    indexData_.push_back(33);
+    indexData_.push_back(0);
+    indexData_.push_back(2);
+    indexData_.push_back(4);
+    indexData_.push_back(6);
+    indexData_.push_back(8);
+    indexData_.push_back(10);
+    indexData_.push_back(9);
+    indexData_.push_back(7);
+    indexData_.push_back(5);
+    indexData_.push_back(3);
+    indexData_.push_back(1);
+    indexData_.push_back(12);
+    indexData_.push_back(14);
+    indexData_.push_back(16);
+    indexData_.push_back(18);
+    indexData_.push_back(20);
+    indexData_.push_back(22);
+    indexData_.push_back(24);
+    indexData_.push_back(26);
+    indexData_.push_back(28);
+    indexData_.push_back(30);
+    indexData_.push_back(32);
+    indexData_.push_back(33);
+    indexData_.push_back(31);
+    indexData_.push_back(29);
+    indexData_.push_back(27);
+    indexData_.push_back(25);
+    indexData_.push_back(23);
+    indexData_.push_back(21);
+    indexData_.push_back(19);
+    indexData_.push_back(17);
+    indexData_.push_back(15);
+    indexData_.push_back(13);
+    indexData_.push_back(11);
+
+    // Primitive state so that the draw call can issue the primitives we want.
+    unsigned int curOffset(0);
+    primVec_.push_back(PrimitiveState(GL_TRIANGLE_STRIP, 11, curOffset));
+    curOffset += (11 * sizeof(unsigned short));
+    primVec_.push_back(PrimitiveState(GL_TRIANGLE_STRIP, 23, curOffset));
+    curOffset += (23 * sizeof(unsigned short));
+    primVec_.push_back(PrimitiveState(GL_LINE_STRIP, 11, curOffset));
+    curOffset += (11 * sizeof(unsigned short));
+    primVec_.push_back(PrimitiveState(GL_LINE_STRIP, 23, curOffset));
+}
diff --git a/src/scene-ideas/o.cc b/src/scene-ideas/o.cc
new file mode 100644
index 0000000..372743c
--- /dev/null
+++ b/src/scene-ideas/o.cc
@@ -0,0 +1,139 @@
+/*
+ * Vertex position data describing the letter 'o'
+ *
+ * (c) Copyright 1993, Silicon Graphics, Inc.
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Jesse Barker
+ */
+#include "characters.h"
+
+using LibMatrix::vec2;
+
+LetterO::LetterO()
+{
+    // Vertex data...
+    vertexData_.push_back(vec2(2.975610, 9.603255));
+    vertexData_.push_back(vec2(2.878049, 9.342828));
+    vertexData_.push_back(vec2(2.292683, 9.131231));
+    vertexData_.push_back(vec2(2.048780, 8.691760));
+    vertexData_.push_back(vec2(1.707317, 8.528993));
+    vertexData_.push_back(vec2(1.658537, 7.731434));
+    vertexData_.push_back(vec2(0.878049, 7.047813));
+    vertexData_.push_back(vec2(1.349594, 5.550356));
+    vertexData_.push_back(vec2(0.569106, 5.029501));
+    vertexData_.push_back(vec2(1.528455, 4.443540));
+    vertexData_.push_back(vec2(0.991870, 3.434385));
+    vertexData_.push_back(vec2(1.967480, 3.955239));
+    vertexData_.push_back(vec2(1.772358, 2.994914));
+    vertexData_.push_back(vec2(2.422764, 3.825025));
+    vertexData_.push_back(vec2(2.829268, 3.092574));
+    vertexData_.push_back(vec2(3.154472, 3.971516));
+    vertexData_.push_back(vec2(3.512195, 3.727365));
+    vertexData_.push_back(vec2(3.772358, 4.264496));
+    vertexData_.push_back(vec2(4.130081, 4.524924));
+    vertexData_.push_back(vec2(4.162601, 4.996948));
+    vertexData_.push_back(vec2(4.699187, 5.403866));
+    vertexData_.push_back(vec2(4.471545, 6.461852));
+    vertexData_.push_back(vec2(5.219512, 7.243133));
+    vertexData_.push_back(vec2(4.439024, 8.105799));
+    vertexData_.push_back(vec2(5.235772, 8.756866));
+    vertexData_.push_back(vec2(4.065041, 8.870804));
+    vertexData_.push_back(vec2(4.991870, 9.391658));
+    vertexData_.push_back(vec2(3.853658, 9.228891));
+    vertexData_.push_back(vec2(4.390244, 9.912513));
+    vertexData_.push_back(vec2(3.463415, 9.407935));
+    vertexData_.push_back(vec2(3.674797, 9.912513));
+    vertexData_.push_back(vec2(2.829268, 9.342828));
+    vertexData_.push_back(vec2(2.959350, 9.603255));
+
+    // Index data...
+    indexData_.push_back(0);
+    indexData_.push_back(1);
+    indexData_.push_back(2);
+    indexData_.push_back(3);
+    indexData_.push_back(4);
+    indexData_.push_back(5);
+    indexData_.push_back(6);
+    indexData_.push_back(7);
+    indexData_.push_back(8);
+    indexData_.push_back(9);
+    indexData_.push_back(10);
+    indexData_.push_back(11);
+    indexData_.push_back(12);
+    indexData_.push_back(13);
+    indexData_.push_back(14);
+    indexData_.push_back(15);
+    indexData_.push_back(16);
+    indexData_.push_back(17);
+    indexData_.push_back(18);
+    indexData_.push_back(19);
+    indexData_.push_back(20);
+    indexData_.push_back(21);
+    indexData_.push_back(22);
+    indexData_.push_back(23);
+    indexData_.push_back(24);
+    indexData_.push_back(25);
+    indexData_.push_back(26);
+    indexData_.push_back(27);
+    indexData_.push_back(28);
+    indexData_.push_back(29);
+    indexData_.push_back(30);
+    indexData_.push_back(31);
+    indexData_.push_back(32);
+    indexData_.push_back(0);
+    indexData_.push_back(2);
+    indexData_.push_back(4);
+    indexData_.push_back(6);
+    indexData_.push_back(8);
+    indexData_.push_back(10);
+    indexData_.push_back(12);
+    indexData_.push_back(14);
+    indexData_.push_back(16);
+    indexData_.push_back(18);
+    indexData_.push_back(20);
+    indexData_.push_back(22);
+    indexData_.push_back(24);
+    indexData_.push_back(26);
+    indexData_.push_back(28);
+    indexData_.push_back(30);
+    indexData_.push_back(32);
+    indexData_.push_back(31);
+    indexData_.push_back(29);
+    indexData_.push_back(27);
+    indexData_.push_back(25);
+    indexData_.push_back(23);
+    indexData_.push_back(21);
+    indexData_.push_back(19);
+    indexData_.push_back(17);
+    indexData_.push_back(15);
+    indexData_.push_back(13);
+    indexData_.push_back(11);
+    indexData_.push_back(9);
+    indexData_.push_back(7);
+    indexData_.push_back(5);
+    indexData_.push_back(3);
+    indexData_.push_back(1);
+
+    // Primitive state so that the draw call can issue the primitives we want.
+    unsigned int curOffset(0);
+    primVec_.push_back(PrimitiveState(GL_TRIANGLE_STRIP, 33, curOffset));
+    curOffset += (33 * sizeof(unsigned short));
+    primVec_.push_back(PrimitiveState(GL_LINE_STRIP, 33, curOffset));
+}
diff --git a/src/scene-ideas/s.cc b/src/scene-ideas/s.cc
new file mode 100644
index 0000000..e67c9b6
--- /dev/null
+++ b/src/scene-ideas/s.cc
@@ -0,0 +1,130 @@
+/*
+ * Vertex position data describing the letter 's'
+ *
+ * (c) Copyright 1993, Silicon Graphics, Inc.
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Jesse Barker
+ */
+#include "characters.h"
+
+using LibMatrix::vec2;
+
+LetterS::LetterS()
+{
+    // Vertex data...
+    vertexData_.push_back(vec2(0.860393, 5.283798));
+    vertexData_.push_back(vec2(0.529473, 3.550052));
+    vertexData_.push_back(vec2(0.992761, 4.491228));
+    vertexData_.push_back(vec2(0.910031, 3.368421));
+    vertexData_.push_back(vec2(1.240951, 3.830753));
+    vertexData_.push_back(vec2(1.456050, 3.104231));
+    vertexData_.push_back(vec2(1.935884, 3.517028));
+    vertexData_.push_back(vec2(2.002068, 2.988648));
+    vertexData_.push_back(vec2(2.763185, 3.533540));
+    vertexData_.push_back(vec2(3.061013, 3.120743));
+    vertexData_.push_back(vec2(3.391934, 3.748194));
+    vertexData_.push_back(vec2(4.053774, 3.632611));
+    vertexData_.push_back(vec2(3.822130, 4.540764));
+    vertexData_.push_back(vec2(4.550155, 4.590299));
+    vertexData_.push_back(vec2(3.656670, 5.465428));
+    vertexData_.push_back(vec2(4.517063, 5.713106));
+    vertexData_.push_back(vec2(3.276112, 5.894737));
+    vertexData_.push_back(vec2(3.921407, 6.538700));
+    vertexData_.push_back(vec2(2.299896, 6.736842));
+    vertexData_.push_back(vec2(3.044467, 7.430341));
+    vertexData_.push_back(vec2(1.886246, 7.496388));
+    vertexData_.push_back(vec2(2.581179, 8.222910));
+    vertexData_.push_back(vec2(1.902792, 8.751290));
+    vertexData_.push_back(vec2(2.680455, 8.883385));
+    vertexData_.push_back(vec2(2.283350, 9.312694));
+    vertexData_.push_back(vec2(3.358842, 9.609907));
+    vertexData_.push_back(vec2(3.507756, 9.907121));
+    vertexData_.push_back(vec2(4.285419, 9.758514));
+    vertexData_.push_back(vec2(5.112720, 9.973168));
+    vertexData_.push_back(vec2(4.748707, 9.593395));
+
+    // Index data...
+    indexData_.push_back(0);
+    indexData_.push_back(1);
+    indexData_.push_back(2);
+    indexData_.push_back(3);
+    indexData_.push_back(4);
+    indexData_.push_back(5);
+    indexData_.push_back(6);
+    indexData_.push_back(7);
+    indexData_.push_back(8);
+    indexData_.push_back(9);
+    indexData_.push_back(10);
+    indexData_.push_back(11);
+    indexData_.push_back(12);
+    indexData_.push_back(13);
+    indexData_.push_back(14);
+    indexData_.push_back(15);
+    indexData_.push_back(16);
+    indexData_.push_back(17);
+    indexData_.push_back(18);
+    indexData_.push_back(19);
+    indexData_.push_back(20);
+    indexData_.push_back(21);
+    indexData_.push_back(22);
+    indexData_.push_back(23);
+    indexData_.push_back(24);
+    indexData_.push_back(25);
+    indexData_.push_back(26);
+    indexData_.push_back(27);
+    indexData_.push_back(28);
+    indexData_.push_back(29);
+    indexData_.push_back(0);
+    indexData_.push_back(2);
+    indexData_.push_back(4);
+    indexData_.push_back(6);
+    indexData_.push_back(8);
+    indexData_.push_back(10);
+    indexData_.push_back(12);
+    indexData_.push_back(14);
+    indexData_.push_back(16);
+    indexData_.push_back(18);
+    indexData_.push_back(20);
+    indexData_.push_back(22);
+    indexData_.push_back(24);
+    indexData_.push_back(26);
+    indexData_.push_back(28);
+    indexData_.push_back(29);
+    indexData_.push_back(27);
+    indexData_.push_back(25);
+    indexData_.push_back(23);
+    indexData_.push_back(21);
+    indexData_.push_back(19);
+    indexData_.push_back(17);
+    indexData_.push_back(15);
+    indexData_.push_back(13);
+    indexData_.push_back(11);
+    indexData_.push_back(9);
+    indexData_.push_back(7);
+    indexData_.push_back(5);
+    indexData_.push_back(3);
+    indexData_.push_back(1);
+
+    // Primitive state so that the draw call can issue the primitives we want.
+    unsigned int curOffset(0);
+    primVec_.push_back(PrimitiveState(GL_TRIANGLE_STRIP, 30, curOffset));
+    curOffset += (30 * sizeof(unsigned short));
+    primVec_.push_back(PrimitiveState(GL_LINE_STRIP, 30, curOffset));
+}
diff --git a/src/scene-ideas/splines.cc b/src/scene-ideas/splines.cc
new file mode 100644
index 0000000..7027144
--- /dev/null
+++ b/src/scene-ideas/splines.cc
@@ -0,0 +1,200 @@
+/*
+ * (c) Copyright 1993, Silicon Graphics, Inc.
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Jesse Barker
+ */
+#include "splines.h"
+
+using LibMatrix::vec3;
+
+void
+Spline::calcParams()
+{
+    unsigned int numParams(controlData_.size() - 3);
+    paramData_ = new param[numParams];
+    for (unsigned int i = 0; i < numParams; i++)
+    {
+        float x3(controlData_[i + 1].x());
+        float x2(controlData_[i + 2].x() - controlData_[i].x());
+        float x1(2.0 * controlData_[i].x() +
+	        -2.0 * controlData_[i+1].x() +
+	         1.0 * controlData_[i+2].x() +
+	        -1.0 * controlData_[i+3].x());
+        float x0(-1.0 * controlData_[i].x() +
+	          1.0 * controlData_[i+1].x() +
+	         -1.0 * controlData_[i+2].x() +
+	          1.0 * controlData_[i+3].x());
+        float y3(controlData_[i + 1].y());
+        float y2(controlData_[i + 2].y() - controlData_[i].y());
+        float y1(2.0 * controlData_[i].y() +
+	        -2.0 * controlData_[i+1].y() +
+	         1.0 * controlData_[i+2].y() +
+	        -1.0 * controlData_[i+3].y());
+        float y0(-1.0 * controlData_[i].y() +
+	          1.0 * controlData_[i+1].y() +
+	         -1.0 * controlData_[i+2].y() +
+	          1.0 * controlData_[i+3].y());
+        float z3(controlData_[i + 1].z());
+        float z2(controlData_[i + 2].z() - controlData_[i].z());
+        float z1(2.0 * controlData_[i].z() +
+	        -2.0 * controlData_[i+1].z() +
+	         1.0 * controlData_[i+2].z() +
+	        -1.0 * controlData_[i+3].z());
+        float z0(-1.0 * controlData_[i].z() +
+	          1.0 * controlData_[i+1].z() +
+	         -1.0 * controlData_[i+2].z() +
+	          1.0 * controlData_[i+3].z());
+        paramData_[i][3].x(x3);
+        paramData_[i][2].x(x2);
+        paramData_[i][1].x(x1);
+        paramData_[i][0].x(x0);
+        paramData_[i][3].y(y3);
+        paramData_[i][2].y(y2);
+        paramData_[i][1].y(y1);
+        paramData_[i][0].y(y0);
+        paramData_[i][3].z(z3);
+        paramData_[i][2].z(z2);
+        paramData_[i][1].z(z1);
+        paramData_[i][0].z(z0);
+    }
+}
+
+void
+Spline::getCurrentVec(float currentTime, vec3& v) const
+{
+    unsigned int integerTime(static_cast<unsigned int>(currentTime));
+    float t(currentTime - static_cast<float>(integerTime));
+    v.x(paramData_[integerTime][3].x() +
+	paramData_[integerTime][2].x() * t +
+	paramData_[integerTime][1].x() * t * t +
+	paramData_[integerTime][0].x() * t * t * t);
+    v.y(paramData_[integerTime][3].y() +
+	paramData_[integerTime][2].y() * t +
+	paramData_[integerTime][1].y() * t * t +
+	paramData_[integerTime][0].y() * t * t * t);
+    v.z(paramData_[integerTime][3].z() +
+	paramData_[integerTime][2].z() * t +
+	paramData_[integerTime][1].z() * t * t +
+	paramData_[integerTime][0].z() * t * t * t);
+}
+
+ViewFromSpline::ViewFromSpline()
+{
+    addControlPoint(vec3(-1.0, 1.0, -4.0));
+    addControlPoint(vec3(-1.0, -3.0, -4.0));
+    addControlPoint(vec3(-3.0, 1.0, -3.0));
+    addControlPoint(vec3(-1.8, 2.0, 5.4));
+    addControlPoint(vec3(-0.4, 2.0, 1.2));
+    addControlPoint(vec3(-0.2, 1.5, 0.6));
+    addControlPoint(vec3(-0.2, 1.2, 0.6));
+    addControlPoint(vec3(-0.8, 1.0, 2.4));
+    addControlPoint(vec3(-1.0, 2.0, 3.0));
+    addControlPoint(vec3(0.0, 4.0, 3.6));
+    addControlPoint(vec3(-0.8, 4.0, 1.2));
+    addControlPoint(vec3(-0.2, 3.0, 0.6));
+    addControlPoint(vec3(-0.1, 2.0, 0.3));
+    addControlPoint(vec3(-0.1, 2.0, 0.3));
+    addControlPoint(vec3(-0.1, 2.0, 0.3));
+    addControlPoint(vec3(-0.1, 2.0, 0.3));
+    calcParams();
+}
+
+ViewToSpline::ViewToSpline()
+{
+    addControlPoint(vec3(-1.0, 1.0, 0.0));
+    addControlPoint(vec3(-1.0, -3.0, 0.0));
+    addControlPoint(vec3(-1.0, 1.0, 0.0));
+    addControlPoint(vec3(0.1, 0.0, -0.3));
+    addControlPoint(vec3(0.1, 0.0, -0.3));
+    addControlPoint(vec3(0.1, 0.0, -0.3));
+    addControlPoint(vec3(0.0, 0.2, 0.0));
+    addControlPoint(vec3(0.0, 0.6, 0.0));
+    addControlPoint(vec3(0.0, 0.8, 0.0));
+    addControlPoint(vec3(0.0, 0.8, 0.0));
+    addControlPoint(vec3(0.0, 0.8, 0.0));
+    addControlPoint(vec3(0.0, 0.8, 0.0));
+    addControlPoint(vec3(0.0, 0.8, 0.0));
+    addControlPoint(vec3(0.0, 0.8, 0.0));
+    addControlPoint(vec3(0.0, 0.8, 0.0));
+    addControlPoint(vec3(0.0, 0.8, 0.0));
+    calcParams();
+}
+
+LightPositionSpline::LightPositionSpline()
+{
+    addControlPoint(vec3(0.0, 1.8, 0.0));
+    addControlPoint(vec3(0.0, 1.8, 0.0));
+    addControlPoint(vec3(0.0, 1.6, 0.0));
+    addControlPoint(vec3(0.0, 1.6, 0.0));
+    addControlPoint(vec3(0.0, 1.6, 0.0));
+    addControlPoint(vec3(0.0, 1.6, 0.0));
+    addControlPoint(vec3(0.0, 1.4, 0.0));
+    addControlPoint(vec3(0.0, 1.3, 0.0));
+    addControlPoint(vec3(-0.2, 1.5, 2.0));
+    addControlPoint(vec3(0.8, 1.5, -0.4));
+    addControlPoint(vec3(-0.8, 1.5, -0.4));
+    addControlPoint(vec3(0.8, 2.0, 1.0));
+    addControlPoint(vec3(1.8, 5.0, -1.8));
+    addControlPoint(vec3(8.0, 10.0, -4.0));
+    addControlPoint(vec3(8.0, 10.0, -4.0));
+    addControlPoint(vec3(8.0, 10.0, -4.0));
+    calcParams();
+}
+
+LogoPositionSpline::LogoPositionSpline()
+{
+    addControlPoint(vec3(0.0, -0.5, 0.0));
+    addControlPoint(vec3(0.0, -0.5, 0.0));
+    addControlPoint(vec3(0.0, -0.5, 0.0));
+    addControlPoint(vec3(0.0, -0.5, 0.0));
+    addControlPoint(vec3(0.0, -0.5, 0.0));
+    addControlPoint(vec3(0.0, -0.5, 0.0));
+    addControlPoint(vec3(0.0, 0.0, 0.0));
+    addControlPoint(vec3(0.0, 0.6, 0.0));
+    addControlPoint(vec3(0.0, 0.75, 0.0));
+    addControlPoint(vec3(0.0, 0.8, 0.0));
+    addControlPoint(vec3(0.0, 0.8, 0.0));
+    addControlPoint(vec3(0.0, 0.5, 0.0));
+    addControlPoint(vec3(0.0, 0.5, 0.0));
+    addControlPoint(vec3(0.0, 0.5, 0.0));
+    addControlPoint(vec3(0.0, 0.5, 0.0));
+    addControlPoint(vec3(0.0, 0.5, 0.0));
+    calcParams();
+}
+
+LogoRotationSpline::LogoRotationSpline()
+{
+    addControlPoint(vec3(0.0, 0.0, -18.4));
+    addControlPoint(vec3(0.0, 0.0, -18.4));
+    addControlPoint(vec3(0.0, 0.0, -18.4));
+    addControlPoint(vec3(0.0, 0.0, -18.4));
+    addControlPoint(vec3(0.0, 0.0, -18.4));
+    addControlPoint(vec3(0.0, 0.0, -18.4));
+    addControlPoint(vec3(0.0, 0.0, -18.4));
+    addControlPoint(vec3(0.0, 0.0, -18.4));
+    addControlPoint(vec3(240.0, 360.0, 180.0));
+    addControlPoint(vec3(90.0, 180.0, 90.0));
+    addControlPoint(vec3(11.9, 0.0, -18.4));
+    addControlPoint(vec3(11.9, 0.0, -18.4));
+    addControlPoint(vec3(11.9, 0.0, -18.4));
+    addControlPoint(vec3(11.9, 0.0, -18.4));
+    addControlPoint(vec3(11.9, 0.0, -18.4));
+    calcParams();
+}
diff --git a/src/scene-ideas/splines.h b/src/scene-ideas/splines.h
new file mode 100644
index 0000000..6e30fdd
--- /dev/null
+++ b/src/scene-ideas/splines.h
@@ -0,0 +1,83 @@
+/*
+ * (c) Copyright 1993, Silicon Graphics, Inc.
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Jesse Barker
+ */
+#ifndef SPLINES_H_
+#define SPLINES_H_
+
+#include <vector>
+#include "vec.h"
+
+class Spline
+{
+public:
+    Spline() :
+        paramData_(0) {}
+    ~Spline()
+    {
+        delete [] paramData_;
+    }
+    void addControlPoint(const LibMatrix::vec3& point) { controlData_.push_back(point); }
+    void getCurrentVec(float currentTime, LibMatrix::vec3& v) const;
+    void calcParams();
+
+private:
+    std::vector<LibMatrix::vec3> controlData_;
+    typedef LibMatrix::vec3 param[4];
+    param* paramData_;
+};
+
+class ViewFromSpline : public Spline
+{
+public:
+    ViewFromSpline();
+    ~ViewFromSpline() {}
+};
+
+class ViewToSpline : public Spline
+{
+public:
+    ViewToSpline();
+    ~ViewToSpline() {}
+};
+
+class LightPositionSpline : public Spline
+{
+public:
+    LightPositionSpline();
+    ~LightPositionSpline() {}
+};
+
+class LogoPositionSpline : public Spline
+{
+public:
+    LogoPositionSpline();
+    ~LogoPositionSpline() {}
+};
+
+class LogoRotationSpline : public Spline
+{
+public:
+    LogoRotationSpline();
+    ~LogoRotationSpline() {}
+};
+
+#endif // SPLINES_H_
diff --git a/src/scene-ideas/t.cc b/src/scene-ideas/t.cc
new file mode 100644
index 0000000..314a38e
--- /dev/null
+++ b/src/scene-ideas/t.cc
@@ -0,0 +1,147 @@
+/*
+ * Vertex position data describing the letter 't'
+ *
+ * (c) Copyright 1993, Silicon Graphics, Inc.
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Jesse Barker
+ */
+#include "characters.h"
+
+using LibMatrix::vec2;
+
+LetterT::LetterT()
+{
+    // Vertex data...
+    vertexData_.push_back(vec2(2.986667, 14.034801));
+    vertexData_.push_back(vec2(2.445128, 10.088024));
+    vertexData_.push_back(vec2(1.788718, 9.236438));
+    vertexData_.push_back(vec2(2.264615, 7.664279));
+    vertexData_.push_back(vec2(1.165128, 5.666326));
+    vertexData_.push_back(vec2(2.034872, 4.945752));
+    vertexData_.push_back(vec2(1.132308, 3.766633));
+    vertexData_.push_back(vec2(2.182564, 3.570113));
+    vertexData_.push_back(vec2(1.411282, 2.309109));
+    vertexData_.push_back(vec2(2.510769, 2.341863));
+    vertexData_.push_back(vec2(2.149744, 1.048106));
+    vertexData_.push_back(vec2(3.364103, 1.375640));
+    vertexData_.push_back(vec2(3.167180, 0.327533));
+    vertexData_.push_back(vec2(4.381538, 0.736950));
+    vertexData_.push_back(vec2(5.005128, 0.032753));
+    vertexData_.push_back(vec2(5.612308, 0.638690));
+    vertexData_.push_back(vec2(6.235898, 0.540430));
+    vertexData_.push_back(vec2(7.187692, 1.162743));
+    vertexData_.push_back(vec2(1.985641, 9.039918));
+    vertexData_.push_back(vec2(2.133333, 10.186285));
+    vertexData_.push_back(vec2(1.509744, 9.023541));
+    vertexData_.push_back(vec2(1.608205, 9.662231));
+    vertexData_.push_back(vec2(1.050256, 9.023541));
+    vertexData_.push_back(vec2(1.050256, 9.334698));
+    vertexData_.push_back(vec2(0.196923, 9.007165));
+    vertexData_.push_back(vec2(2.363077, 9.711361));
+    vertexData_.push_back(vec2(2.264615, 9.023541));
+    vertexData_.push_back(vec2(3.282051, 9.563972));
+    vertexData_.push_back(vec2(3.446154, 9.023541));
+    vertexData_.push_back(vec2(4.069744, 9.531218));
+    vertexData_.push_back(vec2(4.299487, 9.236438));
+    vertexData_.push_back(vec2(4.644103, 9.613101));
+    vertexData_.push_back(vec2(5.251282, 9.875128));
+
+    // Index data...
+    indexData_.push_back(0);
+    indexData_.push_back(1);
+    indexData_.push_back(2);
+    indexData_.push_back(3);
+    indexData_.push_back(4);
+    indexData_.push_back(5);
+    indexData_.push_back(6);
+    indexData_.push_back(7);
+    indexData_.push_back(8);
+    indexData_.push_back(9);
+    indexData_.push_back(10);
+    indexData_.push_back(11);
+    indexData_.push_back(12);
+    indexData_.push_back(13);
+    indexData_.push_back(14);
+    indexData_.push_back(15);
+    indexData_.push_back(16);
+    indexData_.push_back(17);
+    indexData_.push_back(18);
+    indexData_.push_back(19);
+    indexData_.push_back(20);
+    indexData_.push_back(21);
+    indexData_.push_back(22);
+    indexData_.push_back(23);
+    indexData_.push_back(24);
+    indexData_.push_back(25);
+    indexData_.push_back(26);
+    indexData_.push_back(27);
+    indexData_.push_back(28);
+    indexData_.push_back(29);
+    indexData_.push_back(30);
+    indexData_.push_back(31);
+    indexData_.push_back(32);
+    indexData_.push_back(0);
+    indexData_.push_back(2);
+    indexData_.push_back(4);
+    indexData_.push_back(6);
+    indexData_.push_back(8);
+    indexData_.push_back(10);
+    indexData_.push_back(12);
+    indexData_.push_back(14);
+    indexData_.push_back(16);
+    indexData_.push_back(17);
+    indexData_.push_back(15);
+    indexData_.push_back(13);
+    indexData_.push_back(11);
+    indexData_.push_back(9);
+    indexData_.push_back(7);
+    indexData_.push_back(5);
+    indexData_.push_back(3);
+    indexData_.push_back(1);
+    indexData_.push_back(18);
+    indexData_.push_back(20);
+    indexData_.push_back(22);
+    indexData_.push_back(24);
+    indexData_.push_back(23);
+    indexData_.push_back(21);
+    indexData_.push_back(19);
+    indexData_.push_back(26);
+    indexData_.push_back(28);
+    indexData_.push_back(30);
+    indexData_.push_back(32);
+    indexData_.push_back(31);
+    indexData_.push_back(29);
+    indexData_.push_back(27);
+    indexData_.push_back(25);
+
+    // Primitive state so that the draw call can issue the primitives we want.
+    unsigned int curOffset(0);
+    primVec_.push_back(PrimitiveState(GL_TRIANGLE_STRIP, 18, curOffset));
+    curOffset += (18 * sizeof(unsigned short));
+    primVec_.push_back(PrimitiveState(GL_TRIANGLE_STRIP, 7, curOffset));
+    curOffset += (7 * sizeof(unsigned short));
+    primVec_.push_back(PrimitiveState(GL_TRIANGLE_STRIP, 8, curOffset));
+    curOffset += (8 * sizeof(unsigned short));
+    primVec_.push_back(PrimitiveState(GL_LINE_STRIP, 18, curOffset));
+    curOffset += (18 * sizeof(unsigned short));
+    primVec_.push_back(PrimitiveState(GL_LINE_STRIP, 7, curOffset));
+    curOffset += (7 * sizeof(unsigned short));
+    primVec_.push_back(PrimitiveState(GL_LINE_STRIP, 8, curOffset));
+}
diff --git a/src/scene-ideas/table.cc b/src/scene-ideas/table.cc
new file mode 100644
index 0000000..baa156e
--- /dev/null
+++ b/src/scene-ideas/table.cc
@@ -0,0 +1,353 @@
+/*
+ * (c) Copyright 1993, Silicon Graphics, Inc.
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Jesse Barker
+ */
+#include "table.h"
+#include "scene.h"
+#include "shader-source.h"
+#include "log.h"
+
+using std::string;
+using LibMatrix::vec3;
+using LibMatrix::Stack4;
+
+const string Table::modelviewName_("modelview");
+const string Table::projectionName_("projection");
+const string Table::lightPositionName_("lightPosition");
+const string Table::logoDirectionName_("logoDirection");
+const string Table::curTimeName_("currentTime");
+const string Table::vertexAttribName_("vertex");
+const unsigned int Table::TABLERES_(12);
+const vec3 Table::paperVertices_[4] = {
+    vec3(-0.8, 0.0, 0.4),
+    vec3(-0.2, 0.0, -1.4),
+    vec3(0.4, 0.0, 0.8),
+    vec3(1.0, 0.0, -1.0),
+};
+
+Table::Table() :
+    tableVertexIndex_(0),
+    paperVertexIndex_(0),
+    textVertexIndex_(0),
+    underVertexIndex_(0),
+    valid_(false)
+{
+    tableVertices_.reserve((TABLERES_ + 1) * (TABLERES_ + 1));
+    for (unsigned int i = 0; i <= TABLERES_; i++)
+    {
+        for (unsigned int j = 0; j <= TABLERES_; j++)
+        {
+            float x((static_cast<float>(i) - static_cast<float>(TABLERES_) * 1.0 / 2.0) / 2.0);
+            float z((static_cast<float>(j) - static_cast<float>(TABLERES_) * 1.0 / 2.0) / 2.0);
+            tableVertices_.push_back(vec3(x, 0.0, z));
+        }
+    }
+
+    // Now that we've setup the vertex data, we can setup the map of how
+    // that data will be laid out in the buffer object.
+    dataMap_.tvOffset = 0;
+    dataMap_.tvSize = tableVertices_.size() * sizeof(vec3);
+    dataMap_.totalSize = dataMap_.tvSize;
+    dataMap_.pvOffset = dataMap_.tvOffset + dataMap_.tvSize;
+    dataMap_.pvSize = 4 * sizeof(vec3);
+    dataMap_.totalSize += dataMap_.pvSize;
+
+    for (unsigned int i = 0; i < TABLERES_; i++)
+    {
+        for (unsigned int j = 0; j <= TABLERES_; j++)
+        {
+            unsigned int curIndex1(i * (TABLERES_ + 1) + j);
+            unsigned int curIndex2((i + 1) * (TABLERES_ + 1) + j);
+            indexData_.push_back(curIndex1);
+            indexData_.push_back(curIndex2);
+        }
+    }
+}
+
+Table::~Table(void)
+{
+    if (valid_)
+    {
+        glDeleteBuffers(2, &bufferObjects_[0]);
+    }
+}
+
+void
+Table::init(void)
+{
+    // Make sure we don't re-initialize...
+    if (valid_)
+    {
+        return;
+    }
+
+    // Initialize shader sources from input files and create programs from them
+    // Program to render the table with lighting and a time-based fade...
+    string table_vtx_filename(GLMARK_DATA_PATH"/shaders/ideas-table.vert");
+    string table_frg_filename(GLMARK_DATA_PATH"/shaders/ideas-table.frag");
+    ShaderSource table_vtx_source(table_vtx_filename);
+    ShaderSource table_frg_source(table_frg_filename);
+    if (!Scene::load_shaders_from_strings(tableProgram_, table_vtx_source.str(),
+                                          table_frg_source.str()))
+    {
+        Log::error("No valid program for table rendering.\n");
+        return;
+    }
+    textVertexIndex_ = tableProgram_[vertexAttribName_].location();
+
+    // Program to render the paper with lighting and a time-based fade...
+    string paper_vtx_filename(GLMARK_DATA_PATH"/shaders/ideas-paper.vert");
+    string paper_frg_filename(GLMARK_DATA_PATH"/shaders/ideas-paper.frag");
+    ShaderSource paper_vtx_source(paper_vtx_filename);
+    ShaderSource paper_frg_source(paper_frg_filename);
+    if (!Scene::load_shaders_from_strings(paperProgram_, paper_vtx_source.str(),
+                                          paper_frg_source.str()))
+    {
+        Log::error("No valid program for paper rendering.\n");
+        return;
+    }
+    paperVertexIndex_ = paperProgram_[vertexAttribName_].location();
+
+    // Program to handle the text (time-based color fade)...
+    string text_vtx_filename(GLMARK_DATA_PATH"/shaders/ideas-text.vert");
+    string text_frg_filename(GLMARK_DATA_PATH"/shaders/ideas-text.frag");
+    ShaderSource text_vtx_source(text_vtx_filename);
+    ShaderSource text_frg_source(text_frg_filename);
+    if (!Scene::load_shaders_from_strings(textProgram_, text_vtx_source.str(),
+                                          text_frg_source.str()))
+    {
+        Log::error("No valid program for text rendering.\n");
+        return;
+    }
+    textVertexIndex_ = textProgram_[vertexAttribName_].location();
+
+    // Program for the drawUnder functionality (just paint it black)...
+    string under_table_vtx_filename(GLMARK_DATA_PATH"/shaders/ideas-under-table.vert");
+    string under_table_frg_filename(GLMARK_DATA_PATH"/shaders/ideas-under-table.frag");
+    ShaderSource under_table_vtx_source(under_table_vtx_filename);
+    ShaderSource under_table_frg_source(under_table_frg_filename);
+    if (!Scene::load_shaders_from_strings(underProgram_, under_table_vtx_source.str(),
+                                          under_table_frg_source.str()))
+    {
+        Log::error("No valid program for under table rendering.\n");
+        return;
+    }
+    underVertexIndex_ = underProgram_[vertexAttribName_].location();
+
+    // Tell all of the characters to initialize themselves...
+    i_.init(textVertexIndex_);
+    d_.init(textVertexIndex_);
+    e_.init(textVertexIndex_);
+    a_.init(textVertexIndex_);
+    s_.init(textVertexIndex_);
+    n_.init(textVertexIndex_);
+    m_.init(textVertexIndex_);
+    o_.init(textVertexIndex_);
+    t_.init(textVertexIndex_);
+
+    // We need 2 buffers for our work here.  One for the vertex data.
+    // and one for the index data.
+    glGenBuffers(2, &bufferObjects_[0]);
+
+    // First, setup the vertex data by binding the first buffer object, 
+    // allocating its data store, and filling it in with our vertex data.
+    glBindBuffer(GL_ARRAY_BUFFER, bufferObjects_[0]);
+    glBufferData(GL_ARRAY_BUFFER, dataMap_.totalSize, 0, GL_STATIC_DRAW);
+    glBufferSubData(GL_ARRAY_BUFFER, dataMap_.tvOffset, dataMap_.tvSize, 
+                    &tableVertices_.front());
+    glBufferSubData(GL_ARRAY_BUFFER, dataMap_.pvOffset, dataMap_.pvSize,
+                    &paperVertices_[0]);
+
+    // Now repeat for our index data.
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, bufferObjects_[1]);
+    glBufferData(GL_ELEMENT_ARRAY_BUFFER, indexData_.size() * sizeof(unsigned short),
+                 &indexData_.front(), GL_STATIC_DRAW);
+
+    // We're ready to go.
+    valid_ = true;
+}
+
+void
+Table::draw(Stack4& modelview,
+    Stack4& projection,
+    const vec3& lightPos,
+    const vec3& logoPos,
+    const float& currentTime,
+    float& paperAlpha_out)
+{
+    glDisable(GL_DEPTH_TEST);
+
+    // Compute the light direction with respect to the logo...
+    vec3 logoDirection(lightPos.x() - logoPos.x(), lightPos.y() - logoPos.y(), 
+        lightPos.z() - logoPos.z());
+    logoDirection.normalize();
+
+    // Compute the alpha component based upon drawing the paper (all of this will
+    // be done in the shader, but we need to pass this back so that the logo's
+    // shadow will look right).
+    for (unsigned int i = 0; i < 4; i++)
+    {
+        vec3 lightDirection(lightPos.x() - paperVertices_[i].x(),
+                            lightPos.y() - paperVertices_[i].y(),
+                            lightPos.z() - paperVertices_[i].z());
+        lightDirection.normalize();
+        float c = vec3::dot(lightDirection, logoDirection);
+        if (c < 0.0)
+        {
+            c = 0.0;
+        }
+        c = c * c * c * lightDirection.y();
+        if ((currentTime > 10.0) && (currentTime < 12.0))
+        {
+            c *= 1.0 - (currentTime - 10.0) * 0.5;
+        }
+        paperAlpha_out += c;
+    }
+
+    glBindBuffer(GL_ARRAY_BUFFER, bufferObjects_[0]);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, bufferObjects_[1]);
+
+    // Draw the table top
+    tableProgram_.start();
+    tableProgram_[projectionName_] = projection.getCurrent();
+    tableProgram_[modelviewName_] = modelview.getCurrent();
+    tableProgram_[lightPositionName_] = lightPos;
+    tableProgram_[logoDirectionName_] = logoDirection;
+    tableProgram_[curTimeName_] = currentTime;
+    glVertexAttribPointer(tableVertexIndex_, 3, GL_FLOAT, GL_FALSE, 0,
+        reinterpret_cast<const GLvoid*>(dataMap_.tvOffset));
+    glEnableVertexAttribArray(tableVertexIndex_);
+    static const unsigned int twiceRes(2 * (TABLERES_ + 1));
+    for (unsigned int i = 0; i < TABLERES_; i++)
+    {
+        glDrawElements(GL_TRIANGLE_STRIP, twiceRes, GL_UNSIGNED_SHORT,
+            reinterpret_cast<const GLvoid*>(i * twiceRes * sizeof(unsigned short)));
+    }
+    glDisableVertexAttribArray(tableVertexIndex_);
+    tableProgram_.stop();
+
+    if (logoPos.y() > -0.33 && logoPos.y() < 0.33)
+    {
+        glEnable(GL_DEPTH_TEST);
+    }
+
+    // Draw the paper lying on the table top
+    paperProgram_.start();
+    paperProgram_[projectionName_] = projection.getCurrent();
+    paperProgram_[modelviewName_] = modelview.getCurrent();
+    paperProgram_[lightPositionName_] = lightPos;
+    paperProgram_[logoDirectionName_] = logoDirection;
+    paperProgram_[curTimeName_] = currentTime;
+    glVertexAttribPointer(paperVertexIndex_, 3, GL_FLOAT, GL_FALSE, 0,
+        reinterpret_cast<const GLvoid*>(dataMap_.pvOffset));
+    glEnableVertexAttribArray(paperVertexIndex_);
+    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+    glDisableVertexAttribArray(paperVertexIndex_);
+    paperProgram_.stop();
+
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
+
+    glDisable(GL_DEPTH_TEST);
+
+    modelview.push();
+    modelview.rotate(-18.4, 0.0, 1.0, 0.0);
+    modelview.translate(-0.3, 0.0, -0.8);
+    modelview.rotate(-90.0, 1.0, 0.0, 0.0);
+    modelview.scale(0.015, 0.015, 0.015);
+
+    // Draw the text on the paper lying on the table top.
+    // Each character has its own array and element buffers, and they have
+    // been initialized with the vertex attrib location for this program.
+    textProgram_.start();
+    textProgram_[projectionName_] = projection.getCurrent();
+    textProgram_[modelviewName_] = modelview.getCurrent();
+    textProgram_[curTimeName_] = currentTime;
+    i_.draw();
+    modelview.translate(3.0, 0.0, 0.0);
+    textProgram_[modelviewName_] = modelview.getCurrent();
+    d_.draw();
+    modelview.translate(6.0, 0.0, 0.0);
+    textProgram_[modelviewName_] = modelview.getCurrent();
+    e_.draw();
+    modelview.translate(5.0, 0.0, 0.0);
+    textProgram_[modelviewName_] = modelview.getCurrent();
+    a_.draw();
+    modelview.translate(6.0, 0.0, 0.0);
+    textProgram_[modelviewName_] = modelview.getCurrent();
+    s_.draw();
+    modelview.translate(10.0, 0.0, 0.0);
+    textProgram_[modelviewName_] = modelview.getCurrent();
+    i_.draw();
+    modelview.translate(3.0, 0.0, 0.0);
+    textProgram_[modelviewName_] = modelview.getCurrent();
+    n_.draw();
+    modelview.translate(-31.0, -13.0, 0.0);
+    textProgram_[modelviewName_] = modelview.getCurrent();
+    m_.draw();
+    modelview.translate(10.0, 0.0, 0.0);
+    textProgram_[modelviewName_] = modelview.getCurrent();
+    o_.draw();
+    modelview.translate(5.0, 0.0, 0.0);
+    textProgram_[modelviewName_] = modelview.getCurrent();
+    t_.draw();
+    modelview.translate(4.0, 0.0, 0.0);
+    textProgram_[modelviewName_] = modelview.getCurrent();
+    i_.draw();
+    modelview.translate(3.5, 0.0, 0.0);
+    textProgram_[modelviewName_] = modelview.getCurrent();
+    o_.draw();
+    modelview.translate(5.0, 0.0, 0.0);
+    textProgram_[modelviewName_] = modelview.getCurrent();
+    n_.draw();
+    textProgram_.stop();
+
+    modelview.pop();
+}
+
+void
+Table::drawUnder(Stack4& modelview, Stack4& projection)
+{
+    glDisable(GL_DEPTH_TEST);
+
+    glBindBuffer(GL_ARRAY_BUFFER, bufferObjects_[0]);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, bufferObjects_[1]);
+
+    underProgram_.start();  
+    underProgram_[modelviewName_] = modelview.getCurrent();
+    underProgram_[projectionName_] = projection.getCurrent();
+    glVertexAttribPointer(underVertexIndex_, 3, GL_FLOAT, GL_FALSE, 0,
+        reinterpret_cast<const GLvoid*>(dataMap_.tvOffset));
+    glEnableVertexAttribArray(underVertexIndex_);
+    static const unsigned int twiceRes(2 * (TABLERES_ + 1));
+    for (unsigned int i = 0; i < TABLERES_; i++)
+    {
+        glDrawElements(GL_TRIANGLE_STRIP, twiceRes, GL_UNSIGNED_SHORT,
+            reinterpret_cast<const GLvoid*>(i * twiceRes * sizeof(unsigned short)));
+    }
+    glDisableVertexAttribArray(underVertexIndex_);
+    underProgram_.stop();
+
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
+
+    glEnable(GL_DEPTH_TEST); 
+}
diff --git a/src/scene-ideas/table.h b/src/scene-ideas/table.h
new file mode 100644
index 0000000..1ede1bc
--- /dev/null
+++ b/src/scene-ideas/table.h
@@ -0,0 +1,94 @@
+/*
+ * (c) Copyright 1993, Silicon Graphics, Inc.
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Jesse Barker
+ */
+#ifndef TABLE_H_
+#define TABLE_H_
+
+#include <string>
+#include <vector>
+#include "characters.h"
+#include "program.h"
+#include "stack.h"
+
+class Table
+{
+public:
+    Table();
+    ~Table();
+
+    void init();
+    bool valid() const { return valid_; }
+    void draw(LibMatrix::Stack4& modelview, LibMatrix::Stack4& projection, 
+              const LibMatrix::vec3& lightPosition, const LibMatrix::vec3& logoPosition,
+              const float& currentTime, float& paperAlpha_out);
+    void drawUnder(LibMatrix::Stack4& modelview, LibMatrix::Stack4& projection);
+
+private:
+    // Text
+    LetterI i_;
+    LetterD d_;
+    LetterE e_;
+    LetterA a_;
+    LetterS s_;
+    LetterN n_;
+    LetterM m_;
+    LetterO o_;
+    LetterT t_;
+    Program tableProgram_;
+    Program paperProgram_;
+    Program textProgram_;
+    Program underProgram_;
+    std::string tableVertexShader_;
+    std::string tableFragmentShader_;
+    std::string paperVertexShader_;
+    std::string paperFragmentShader_;
+    std::string textVertexShader_;
+    std::string textFragmentShader_;
+    std::string underVertexShader_;
+    std::string underFragmentShader_;
+    static const std::string modelviewName_;
+    static const std::string projectionName_;
+    static const std::string lightPositionName_;
+    static const std::string logoDirectionName_;
+    static const std::string curTimeName_;
+    static const std::string vertexAttribName_;
+    static const unsigned int TABLERES_;
+    std::vector<LibMatrix::vec3> tableVertices_;
+    static const LibMatrix::vec3 paperVertices_[4];
+    struct VertexDataMap
+    {
+        unsigned int tvOffset;
+        unsigned int tvSize;
+        unsigned int pvOffset;
+        unsigned int pvSize;
+        unsigned int totalSize;
+    } dataMap_;
+    unsigned int bufferObjects_[2];
+    std::vector<unsigned short> indexData_;
+    int tableVertexIndex_;
+    int paperVertexIndex_;
+    int textVertexIndex_;
+    int underVertexIndex_;
+    bool valid_;
+};
+
+#endif // TABLE_H_
diff --git a/src/scene-jellyfish.cpp b/src/scene-jellyfish.cpp
new file mode 100644
index 0000000..bc18ee3
--- /dev/null
+++ b/src/scene-jellyfish.cpp
@@ -0,0 +1,631 @@
+//
+// Copyright © 2012 Linaro Limited
+//
+// This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+//
+// glmark2 is free software: you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the Free Software
+// Foundation, either version 3 of the License, or (at your option) any later
+// version.
+//
+// glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+// details.
+//
+// You should have received a copy of the GNU General Public License along with
+// glmark2.  If not, see <http://www.gnu.org/licenses/>.
+//
+// Authors:
+//  Aleksandar Rodic - Creator and WebGL implementation 
+//  Jesse Barker - glmark2 port
+//
+#include <string>
+#include <fstream>
+#include <memory>
+#include <iomanip>
+#include "scene.h"
+#include "scene-jellyfish.h"
+#include "log.h"
+#include "util.h"
+#include "texture.h"
+#include "shader-source.h"
+
+SceneJellyfish::SceneJellyfish(Canvas& canvas) :
+    Scene(canvas, "jellyfish"), priv_(0)
+{
+
+}
+
+SceneJellyfish::~SceneJellyfish()
+{
+    delete priv_;
+}
+
+bool
+SceneJellyfish::load()
+{
+    running_ = false;
+    return true;
+}
+
+void
+SceneJellyfish::unload()
+{
+}
+
+bool
+SceneJellyfish::setup()
+{
+    if (!Scene::setup())
+        return false;
+
+    // Set up our private object that does all of the lifting
+    priv_ = new JellyfishPrivate();
+    if (!priv_->initialize())
+        return false;
+
+    // Set core scene timing after actual initialization so we don't measure
+    // set up time.
+    startTime_ = Util::get_timestamp_us() / 1000000.0;
+    lastUpdateTime_ = startTime_;
+    running_ = true;
+
+    return true;
+}
+
+void
+SceneJellyfish::teardown()
+{
+    priv_->cleanup();
+    Scene::teardown();
+}
+
+void
+SceneJellyfish::update()
+{
+    Scene::update();
+    priv_->update_viewport(LibMatrix::vec2(canvas_.width(), canvas_.height()));
+    priv_->update_time();
+}
+
+void
+SceneJellyfish::draw()
+{
+    priv_->draw();
+}
+
+Scene::ValidationResult
+SceneJellyfish::validate()
+{
+    return Scene::ValidationUnknown;
+}
+
+
+//
+// JellyfishPrivate implementation
+//
+using LibMatrix::mat4;
+using LibMatrix::vec3;
+using LibMatrix::vec2;
+using std::string;
+using std::vector;
+
+bool
+GradientRenderer::init()
+{
+    // Program set up
+    static const string vtx_shader_filename(GLMARK_DATA_PATH"/shaders/gradient.vert");
+    static const string frg_shader_filename(GLMARK_DATA_PATH"/shaders/gradient.frag");
+    ShaderSource vtx_source(vtx_shader_filename);
+    ShaderSource frg_source(frg_shader_filename);
+    if (!Scene::load_shaders_from_strings(program_, vtx_source.str(),
+        frg_source.str()))
+    {
+        return false;
+    }
+    positionLocation_ = program_["position"].location();
+    uvLocation_ = program_["uvIn"].location();
+
+    // Set up the position data for our "quad".
+    vertices_.push_back(vec2(-1.0, -1.0));
+    vertices_.push_back(vec2(1.0, -1.0));
+    vertices_.push_back(vec2(-1.0, 1.0));
+    vertices_.push_back(vec2(1.0, 1.0));
+    uvs_.push_back(vec2(1.0, 1.0));
+    uvs_.push_back(vec2(1.0, 1.0));
+    uvs_.push_back(vec2(0.0, 0.0));
+    uvs_.push_back(vec2(0.0, 0.0));
+    uvOffset_ = vertices_.size() * sizeof(vec2);
+
+    // Set up the VBO and stash our position data in it.
+    glGenBuffers(1, &bufferObject_);
+    glBindBuffer(GL_ARRAY_BUFFER, bufferObject_);
+    glBufferData(GL_ARRAY_BUFFER, (vertices_.size() + uvs_.size()) * sizeof(vec2),
+                 0, GL_STATIC_DRAW);
+    glBufferSubData(GL_ARRAY_BUFFER, 0, vertices_.size() * sizeof(vec2),
+                    &vertices_.front());
+    glBufferSubData(GL_ARRAY_BUFFER, uvOffset_, uvs_.size() * sizeof(vec2),
+                    &uvs_.front());
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+
+    return true;
+}
+
+void
+GradientRenderer::cleanup()
+{
+    program_.stop();
+    program_.release();
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    glDeleteBuffers(1, &bufferObject_);
+}
+
+void
+GradientRenderer::draw()
+{
+    static const vec3 lightBlue(0.360784314, 0.584313725, 1.0);
+    static const vec3 darkBlue(0.074509804, 0.156862745, 0.619607843);
+    glBindBuffer(GL_ARRAY_BUFFER, bufferObject_);
+    program_.start();
+    program_["color1"] = lightBlue;
+    program_["color2"] = darkBlue;
+    glEnableVertexAttribArray(positionLocation_);
+    glEnableVertexAttribArray(uvLocation_);
+    glVertexAttribPointer(positionLocation_, 2, GL_FLOAT, GL_FALSE, 0, 0);
+    glVertexAttribPointer(uvLocation_, 2, GL_FLOAT, GL_FALSE, 0,
+                          reinterpret_cast<GLvoid*>(uvOffset_));
+    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+    glDisableVertexAttribArray(positionLocation_);
+    glDisableVertexAttribArray(uvLocation_);
+    program_.stop();
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+}
+
+//!
+// Parse index values from an OBJ file.
+//
+// @param source the source line to parse
+// @param idx the unsigned short to populate
+//
+static void
+obj_get_index(const string& source, unsigned short& idx)
+{
+     // Skip the definition type...
+    string::size_type endPos = source.find(" ");
+    string::size_type startPos(0);
+    if (endPos == string::npos)
+    {
+        Log::error("Bad element '%s'\n", source.c_str());
+        return;
+    }
+    // Find the first value...
+    startPos = endPos + 1;
+    string is(source, startPos);
+    idx = Util::fromString<unsigned short>(is);   
+}
+
+//!
+// Parse vec3 values from an OBJ file.
+//
+// @param source the source line to parse
+// @param v the vec3 to populate
+//
+static void
+obj_get_values(const string& source, vec3& v)
+{
+    // Skip the definition type...
+    string::size_type endPos = source.find(" ");
+    string::size_type startPos(0);
+    if (endPos == string::npos)
+    {
+        Log::error("Bad element '%s'\n", source.c_str());
+        return;
+    }
+    // Find the first value...
+    startPos = endPos + 1;
+    endPos = source.find(" ", startPos);
+    if (endPos == string::npos)
+    {
+        Log::error("Bad element '%s'\n", source.c_str());
+        return;
+    }
+    string::size_type numChars(endPos - startPos);
+    string xs(source, startPos, numChars);
+    float x = Util::fromString<float>(xs);
+    // Then the second value...
+    startPos = endPos + 1;
+    endPos = source.find(" ", startPos);
+    if (endPos == string::npos)
+    {
+        Log::error("Bad element '%s'\n", source.c_str());
+        return;
+    }
+    numChars = endPos - startPos;
+    string ys(source, startPos, numChars);
+    float y = Util::fromString<float>(ys);
+    // And the third value (there might be a fourth, but we don't care)...
+    startPos = endPos + 1;
+    endPos = source.find(" ", startPos);
+    if (endPos == string::npos)
+    {
+        numChars = endPos;
+    }
+    else
+    {
+        numChars = endPos - startPos;
+    }
+    string zs(source, startPos, endPos - startPos);
+    float z = Util::fromString<float>(zs);
+    v.x(x);
+    v.y(y);
+    v.z(z);
+}
+
+// Custom OBJ loader.
+//
+// To support the jellyfish model, some amendments to the OBJ format are
+// necessary.  In particular, a vertex color attribute is required, and
+// it contains an index list rather than a face list.
+bool
+JellyfishPrivate::load_obj(const std::string &filename)
+{
+    Log::debug("Loading model from file '%s'\n", filename.c_str());
+
+    const std::auto_ptr<std::istream> input_file_ptr(Util::get_resource(filename));
+    std::istream& inputFile(*input_file_ptr);
+    if (!inputFile)
+    {
+        Log::error("Failed to open '%s'\n", filename.c_str());
+        return false;
+    }
+
+    vector<string> sourceVec;
+    string curLine;
+    while (getline(inputFile, curLine))
+    {
+        sourceVec.push_back(curLine);
+    }
+
+    static const string vertex_definition("v");
+    static const string normal_definition("vn");
+    static const string texcoord_definition("vt");
+    static const string color_definition("vc");
+    static const string index_definition("i");
+    for (vector<string>::const_iterator lineIt = sourceVec.begin();
+         lineIt != sourceVec.end();
+         lineIt++)
+    {
+        const string& curSrc = *lineIt;
+        // Is it a vertex attribute, a face description, comment or other?
+        // We only care about the first two, we ignore comments, object names,
+        // group names, smoothing groups, etc.
+        string::size_type startPos(0);
+        string::size_type spacePos = curSrc.find(" ", startPos);
+        string definitionType(curSrc, startPos, spacePos - startPos);
+        if (definitionType == vertex_definition)
+        {
+            vec3 v;
+            obj_get_values(curSrc, v);
+            positions_.push_back(v);
+        }
+        else if (definitionType == normal_definition)
+        {
+            vec3 v;
+            obj_get_values(curSrc, v);
+            normals_.push_back(v);
+        }
+        else if (definitionType == color_definition)
+        {
+            vec3 v;
+            obj_get_values(curSrc, v);
+            colors_.push_back(v);
+        }
+        else if (definitionType == texcoord_definition)
+        {
+            vec3 v;
+            obj_get_values(curSrc, v);
+            texcoords_.push_back(v);
+        }
+        else if (definitionType == index_definition)
+        {
+            unsigned short idx(0);
+            obj_get_index(curSrc, idx);
+            indices_.push_back(idx);
+        }
+    }
+
+    Log::debug("Object populated with %u vertices %u normals %u colors %u texcoords and %u indices.\n",
+        positions_.size(), normals_.size(), colors_.size(), texcoords_.size(), indices_.size());
+    return true;
+}
+
+JellyfishPrivate::JellyfishPrivate() :
+    positionLocation_(0),
+    normalLocation_(0),
+    colorLocation_(0),
+    texcoordLocation_(0),
+    viewport_(512.0, 512.0),
+    lightPosition_(10.0, 40.0, -60.0),
+    lightColor_(0.8, 1.3, 1.1, 1.0),
+    lightRadius_(200.0),
+    ambientColor_(0.3, 0.2, 1.0, 1.0),
+    fresnelColor_(0.8, 0.7, 0.6, 1.1),
+    fresnelPower_(1.0),
+    rotation_(0.0),
+    currentTime_(0.0),
+    lastUpdateTime_(0.0),
+    cullFace_(0),
+    depthTest_(0),
+    blend_(0),
+    blendFuncSrc_(0),
+    blendFuncDst_(0)
+{
+}
+
+JellyfishPrivate::~JellyfishPrivate()
+{
+    positions_.clear();
+    normals_.clear();
+    colors_.clear();
+    texcoords_.clear();
+    indices_.clear();
+}
+
+bool
+JellyfishPrivate::initialize()
+{
+    static const string modelFilename(GLMARK_DATA_PATH"/models/jellyfish.jobj");
+    if (!load_obj(modelFilename))
+    {
+        return false;
+    }
+
+    // Now that we've setup the vertex data, we can setup the map of how
+    // that data will be laid out in the buffer object.
+    static const unsigned int sv3(sizeof(vec3));
+    dataMap_.positionOffset = 0;
+    dataMap_.positionSize = positions_.size() * sv3;
+    dataMap_.totalSize = dataMap_.positionSize;
+    dataMap_.normalOffset = dataMap_.positionOffset + dataMap_.positionSize;
+    dataMap_.normalSize = normals_.size() * sv3;
+    dataMap_.totalSize += dataMap_.normalSize;
+    dataMap_.colorOffset = dataMap_.normalOffset + dataMap_.normalSize;
+    dataMap_.colorSize = colors_.size() * sv3;
+    dataMap_.totalSize += dataMap_.colorSize;
+    dataMap_.texcoordOffset = dataMap_.colorOffset + dataMap_.colorSize;
+    dataMap_.texcoordSize = texcoords_.size() * sv3;
+    dataMap_.totalSize += dataMap_.texcoordSize;
+
+    lastUpdateTime_ = Util::get_timestamp_us() / 1000.0;
+    currentTime_ = static_cast<uint64_t>(lastUpdateTime_) % 100000000 / 1000.0;
+    whichCaustic_ = static_cast<uint64_t>(currentTime_ * 30) % 32 + 1;
+    rotation_ = 0.0;
+
+    if (!gradient_.init())
+    {
+        return false;
+    }
+
+    // Set up program first so we can store attribute and uniform locations
+    // away for the 
+    using std::string;
+    static const string vtx_shader_filename(GLMARK_DATA_PATH"/shaders/jellyfish.vert");
+    static const string frg_shader_filename(GLMARK_DATA_PATH"/shaders/jellyfish.frag");
+
+    ShaderSource vtx_source(vtx_shader_filename);
+    ShaderSource frg_source(frg_shader_filename);
+
+    if (!Scene::load_shaders_from_strings(program_, vtx_source.str(),
+        frg_source.str()))
+    {
+        return false;
+    }
+
+    // Stash away attribute and uniform locations for handy use.
+    positionLocation_ = program_["aVertexPosition"].location();
+    normalLocation_ = program_["aVertexNormal"].location();
+    colorLocation_ = program_["aVertexColor"].location();
+    texcoordLocation_ = program_["aTextureCoord"].location();
+
+    // We need 2 buffers for our work here.  One for the vertex data.
+    // and one for the index data.
+    glGenBuffers(2, &bufferObjects_[0]);
+
+    // First, setup the vertex data by binding the first buffer object, 
+    // allocating its data store, and filling it in with our vertex data.
+    glBindBuffer(GL_ARRAY_BUFFER, bufferObjects_[0]);
+    glBufferData(GL_ARRAY_BUFFER, dataMap_.totalSize, 0, GL_STATIC_DRAW);
+    glBufferSubData(GL_ARRAY_BUFFER, dataMap_.positionOffset,
+                    dataMap_.positionSize, &positions_.front());
+    glBufferSubData(GL_ARRAY_BUFFER, dataMap_.normalOffset,
+                    dataMap_.normalSize, &normals_.front());
+    glBufferSubData(GL_ARRAY_BUFFER, dataMap_.colorOffset,
+                    dataMap_.colorSize, &colors_.front());
+    glBufferSubData(GL_ARRAY_BUFFER, dataMap_.texcoordOffset,
+                    dataMap_.texcoordSize, &texcoords_.front());
+
+    // Now repeat for our index data.
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, bufferObjects_[1]);
+    glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices_.size() * sizeof(unsigned short),
+                 &indices_.front(), GL_STATIC_DRAW);
+
+    // "Unbind" our buffer objects to make sure the state is consistent.
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
+
+    // Finally, set up our textures.
+    //
+    // First, the main jellyfish texture
+    bool gotTex = Texture::load("jellyfish256", &textureObjects_[0], GL_LINEAR,
+                                GL_LINEAR, 0);
+    if (!gotTex || textureObjects_[0] == 0)
+    {
+        Log::error("Jellyfish texture set up failed!!!\n");
+        return false;
+    }
+    glBindTexture(GL_TEXTURE_2D, 0);
+    // Then, the caustics textures
+    static const string baseName("jellyfish-caustics-");
+    for (unsigned int i = 1; i < 33; i++)
+    {
+        std::stringstream ss;
+        ss << std::setw(2) << std::setfill('0') << i;
+        string curName(baseName);
+        curName += ss.str();
+        gotTex = Texture::load(curName, &textureObjects_[i], GL_LINEAR,
+                               GL_LINEAR, 0);
+        if (!gotTex || textureObjects_[i] == 0)
+        {
+            Log::error("Caustics texture[%u] set up failed!!!\n", i);
+            return false;
+        }
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+        glBindTexture(GL_TEXTURE_2D, 0);
+    }
+
+    // Save the GL state we are changing so we can restore it later.
+    cullFace_ = glIsEnabled(GL_CULL_FACE);
+    depthTest_ = glIsEnabled(GL_DEPTH_TEST);
+    blend_ = glIsEnabled(GL_BLEND);
+    glGetIntegerv(GL_BLEND_SRC_RGB, &blendFuncSrc_);
+    glGetIntegerv(GL_BLEND_DST_RGB, &blendFuncDst_);
+
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+    glEnable(GL_BLEND);
+    glDisable(GL_CULL_FACE);
+    glDisable(GL_DEPTH_TEST);
+
+    return true;
+}
+
+void
+JellyfishPrivate::update_viewport(const vec2& vp)
+{
+    if (viewport_.x() == vp.x() && viewport_.y() == vp.y())
+    {
+        return;
+    }
+    viewport_ = vp;
+    projection_.loadIdentity();
+    projection_.perspective(30.0, viewport_.x()/viewport_.y(), 20.0, 120.0);    
+}
+
+void
+JellyfishPrivate::update_time()
+{
+    double now = Util::get_timestamp_us() / 1000.0;
+    double elapsedTime = now - lastUpdateTime_;
+    rotation_ += (2.0 * elapsedTime) / 1000.0;
+    currentTime_ = static_cast<uint64_t>(now) % 100000000 / 1000.0;
+    whichCaustic_ = static_cast<uint64_t>(currentTime_ * 30) % 32 + 1;
+    lastUpdateTime_ = now;
+}
+
+void
+JellyfishPrivate::cleanup()
+{
+    // Restore the GL state we changed for the scene.
+    glBlendFunc(blendFuncSrc_, blendFuncDst_);
+    if (GL_FALSE == blend_)
+    {
+        glDisable(GL_BLEND);
+    }
+    if (GL_TRUE == cullFace_)
+    {
+        glEnable(GL_CULL_FACE);
+    }
+    if (GL_TRUE == depthTest_)
+    {
+        glEnable(GL_DEPTH_TEST);
+    }
+
+    program_.stop();
+    program_.release();
+
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
+
+    glDeleteTextures(33, &textureObjects_[0]);
+    glDeleteBuffers(2, &bufferObjects_[0]);
+
+    gradient_.cleanup();
+}
+
+void
+JellyfishPrivate::draw()
+{
+    // "Clear" the background to the desired gradient.
+    gradient_.draw();
+
+    // We need "world", "world view projection", and "world inverse transpose"
+    // matrix uniforms for the current shader.
+    //
+    // NOTE: Some of this seems a bit of a no-op (e.g., multipying by and
+    //       inverting identity matrices), but leave it like the original
+    //       WebGL files for the time being.  Worth revisiting not doing all
+    //       of that math every draw call (might even be good to be doing
+    //       some of it in the shader as well).
+    world_.push();
+    world_.translate(0.0, 5.0, -75.0);
+    world_.rotate(sin(rotation_ / 10.0) * 30.0, 0.0, 1.0, 0.0);
+    world_.rotate(sin(rotation_ / 20.0) * 30.0, 1.0, 0.0, 0.0);
+    world_.scale(5.0, 5.0, 5.0);
+    world_.translate(0.0, sin(rotation_ / 10.0) * 2.5, 0.0);
+    mat4 worldViewProjection(projection_.getCurrent());
+    worldViewProjection *= world_.getCurrent();;
+    mat4 worldInverseTranspose(world_.getCurrent());
+    worldInverseTranspose.inverse().transpose();
+
+    // Load up the uniforms
+    program_.start();
+    program_["uWorld"] = world_.getCurrent();
+    program_["uWorldViewProj"] = worldViewProjection;
+    program_["uWorldInvTranspose"] = worldInverseTranspose;
+    program_["uCurrentTime"] = currentTime_;
+    // Revisit making these constants rather than uniforms as they appear never
+    // to change
+    program_["uLightPos"] = lightPosition_;
+    program_["uLightRadius"] = lightRadius_;
+    program_["uLightCol"] = lightColor_;
+    program_["uAmbientCol"] = ambientColor_;
+    program_["uFresnelCol"] = fresnelColor_;
+    program_["uFresnelPower"] = fresnelPower_;
+    // Set up textures for this frame.
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, textureObjects_[0]);
+    program_["uSampler"] = 0;
+    glActiveTexture(GL_TEXTURE1);
+    glBindTexture(GL_TEXTURE_2D, textureObjects_[whichCaustic_]);
+    program_["uSampler1"] = 1;
+
+    glBindBuffer(GL_ARRAY_BUFFER, bufferObjects_[0]);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, bufferObjects_[1]);
+
+    glEnableVertexAttribArray(positionLocation_);
+    glEnableVertexAttribArray(normalLocation_);
+    glEnableVertexAttribArray(colorLocation_);
+    glEnableVertexAttribArray(texcoordLocation_);
+    glVertexAttribPointer(positionLocation_ , 3, GL_FLOAT, GL_FALSE, 0,
+        reinterpret_cast<const GLvoid*>(dataMap_.positionOffset));
+    glVertexAttribPointer(normalLocation_ , 3, GL_FLOAT, GL_FALSE, 0,
+        reinterpret_cast<const GLvoid*>(dataMap_.normalOffset));
+    glVertexAttribPointer(colorLocation_ , 3, GL_FLOAT, GL_FALSE, 0,
+        reinterpret_cast<const GLvoid*>(dataMap_.colorOffset));
+    glVertexAttribPointer(texcoordLocation_ , 3, GL_FLOAT, GL_FALSE, 0,
+        reinterpret_cast<const GLvoid*>(dataMap_.texcoordOffset));
+
+    glDrawElements(GL_TRIANGLES, indices_.size(), GL_UNSIGNED_SHORT, 0);
+
+    glDisableVertexAttribArray(positionLocation_);
+    glDisableVertexAttribArray(normalLocation_);
+    glDisableVertexAttribArray(colorLocation_);
+    glDisableVertexAttribArray(texcoordLocation_);
+
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
+
+    program_.stop();
+    world_.pop();
+}
diff --git a/src/scene-jellyfish.h b/src/scene-jellyfish.h
new file mode 100644
index 0000000..1e0db3a
--- /dev/null
+++ b/src/scene-jellyfish.h
@@ -0,0 +1,124 @@
+//
+// Copyright © 2012 Linaro Limited
+//
+// This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+//
+// glmark2 is free software: you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the Free Software
+// Foundation, either version 3 of the License, or (at your option) any later
+// version.
+//
+// glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+// details.
+//
+// You should have received a copy of the GNU General Public License along with
+// glmark2.  If not, see <http://www.gnu.org/licenses/>.
+//
+// Authors:
+//  Aleksandar Rodic - Creator and WebGL implementation 
+//  Jesse Barker - glmark2 port
+//
+#ifndef SCENE_JELLYFISH_
+#define SCENE_JELLYFISH_
+#include <vector>
+#include "vec.h"
+#include "stack.h"
+#include "program.h"
+
+class GradientRenderer
+{
+    Program program_;
+    int positionLocation_;
+    int uvLocation_;
+    unsigned int uvOffset_;
+    unsigned int bufferObject_;
+    std::vector<LibMatrix::vec2> vertices_;
+    std::vector<LibMatrix::vec2> uvs_;
+    
+public:
+    GradientRenderer() :
+        positionLocation_(0),
+        uvLocation_(0),
+        uvOffset_(0),
+        bufferObject_(0) {}
+    ~GradientRenderer()
+    {
+        vertices_.clear();
+        uvs_.clear();
+    }
+    bool init();
+    void cleanup();
+    void draw();
+};
+
+class JellyfishPrivate
+{
+    bool load_obj(const std::string& filename);
+
+    // For the background gradient.
+    GradientRenderer gradient_;
+
+    // Vertex data.
+    std::vector<LibMatrix::vec3> positions_;
+    std::vector<LibMatrix::vec3> normals_;
+    std::vector<LibMatrix::vec3> colors_;
+    std::vector<LibMatrix::vec3> texcoords_;
+    std::vector<unsigned short> indices_;
+    // A simple map so we know where each section of our data starts within
+    // our vertex buffer object.
+    struct VertexDataMap
+    {
+        unsigned int positionOffset;
+        unsigned int positionSize;
+        unsigned int normalOffset;
+        unsigned int normalSize;
+        unsigned int colorOffset;
+        unsigned int colorSize;
+        unsigned int texcoordOffset;
+        unsigned int texcoordSize;
+        unsigned int totalSize;
+    } dataMap_;
+    // Object handles
+    unsigned int bufferObjects_[2];
+    unsigned int textureObjects_[33];
+    unsigned int whichCaustic_;
+    std::map<std::string, unsigned int> causticMap_;
+
+    // Program state, including attributes, uniforms, and, locations.
+    Program program_;
+    int positionLocation_;
+    int normalLocation_;
+    int colorLocation_;
+    int texcoordLocation_;
+    LibMatrix::vec2 viewport_;
+    LibMatrix::Stack4 world_;
+    LibMatrix::Stack4 projection_;
+    LibMatrix::vec3 lightPosition_;
+    LibMatrix::vec4 lightColor_;
+    float lightRadius_;
+    LibMatrix::vec4 ambientColor_;
+    LibMatrix::vec4 fresnelColor_;
+    float fresnelPower_;
+    float rotation_;
+    float currentTime_;
+    double lastUpdateTime_;
+    // GL state we plan to override, so we can restore it cleanly.
+    unsigned int cullFace_;
+    unsigned int depthTest_;
+    unsigned int blend_;
+    int blendFuncSrc_;
+    int blendFuncDst_;
+
+public:
+    JellyfishPrivate();
+    ~JellyfishPrivate();
+    bool initialize();
+    void update_viewport(const LibMatrix::vec2& viewport);
+    void update_time();
+    void cleanup();
+    void draw();
+};
+
+#endif // SCENE_JELLYFISH_
diff --git a/src/scene-loop.cpp b/src/scene-loop.cpp
new file mode 100644
index 0000000..564a2fe
--- /dev/null
+++ b/src/scene-loop.cpp
@@ -0,0 +1,179 @@
+/*
+ * Copyright © 2010-2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis (glmark2)
+ */
+#include <cmath>
+
+#include "scene.h"
+#include "mat.h"
+#include "stack.h"
+#include "vec.h"
+#include "log.h"
+#include "shader-source.h"
+#include "util.h"
+
+static const std::string shader_file_base(GLMARK_DATA_PATH"/shaders/loop");
+
+static const std::string vtx_file(shader_file_base + ".vert");
+static const std::string frg_file(shader_file_base + ".frag");
+static const std::string step_simple_file(shader_file_base + "-step-simple.all");
+static const std::string step_loop_file(shader_file_base + "-step-loop.all");
+
+SceneLoop::SceneLoop(Canvas &pCanvas) :
+    SceneGrid(pCanvas, "loop")
+{
+    options_["fragment-steps"] = Scene::Option("fragment-steps", "1",
+            "The number of computational steps in the fragment shader");
+    options_["fragment-loop"] = Scene::Option("fragment-function", "true",
+            "Whether to execute the steps in the vertex shader using a for loop", "false,true");
+    options_["vertex-steps"] = Scene::Option("vertex-steps", "1",
+            "The number of computational steps in the vertex shader");
+    options_["vertex-loop"] = Scene::Option("vertex-function", "true",
+            "Whether to execute the steps in the vertex shader using a for loop", "false,true");
+    options_["vertex-uniform"] = Scene::Option("vertex-uniform", "true",
+            "Whether to use a uniform in the vertex shader for the number of loop iterations to perform (i.e. vertex-steps)",
+            "false,true");
+    options_["fragment-uniform"] = Scene::Option("fragment-uniform", "true",
+            "Whether to use a uniform in the fragment shader for the number of loop iterations to perform (i.e. fragment-steps)",
+            "false,true");
+}
+
+SceneLoop::~SceneLoop()
+{
+}
+
+static std::string
+get_fragment_shader_source(int steps, bool loop, bool uniform)
+{
+    ShaderSource source(frg_file);
+    ShaderSource source_main;
+
+    if (loop) {
+        source_main.append_file(step_loop_file);
+        if (uniform) {
+            source_main.replace("$NLOOPS$", "FragmentLoops");
+        }
+        else {
+            source_main.replace("$NLOOPS$", Util::toString(steps));
+        }
+    }
+    else {
+        for (int i = 0; i < steps; i++)
+            source_main.append_file(step_simple_file);
+    }
+
+    source.replace("$MAIN$", source_main.str());
+
+    return source.str();
+}
+
+static std::string
+get_vertex_shader_source(int steps, bool loop, bool uniform)
+{
+    ShaderSource source(vtx_file);
+    ShaderSource source_main;
+
+    if (loop) {
+        source_main.append_file(step_loop_file);
+        if (uniform) {
+            source_main.replace("$NLOOPS$", "VertexLoops");
+        }
+        else {
+            source_main.replace("$NLOOPS$", Util::toString(steps));
+        }
+    }
+    else {
+        for (int i = 0; i < steps; i++)
+            source_main.append_file(step_simple_file);
+    }
+
+    source.replace("$MAIN$", source_main.str());
+
+    return source.str();
+}
+
+
+bool
+SceneLoop::setup()
+{
+    if (!SceneGrid::setup())
+        return false;
+
+    /* Parse options */
+    bool vtx_loop = options_["vertex-loop"].value == "true";
+    bool frg_loop = options_["fragment-loop"].value == "true";
+    bool vtx_uniform = options_["vertex-uniform"].value == "true";
+    bool frg_uniform = options_["fragment-uniform"].value == "true";
+    int vtx_steps = Util::fromString<int>(options_["vertex-steps"].value);
+    int frg_steps = Util::fromString<int>(options_["fragment-steps"].value);
+
+    /* Load shaders */
+    std::string vtx_shader(get_vertex_shader_source(vtx_steps, vtx_loop,
+                                                    vtx_uniform));
+    std::string frg_shader(get_fragment_shader_source(frg_steps, frg_loop,
+                                                      frg_uniform));
+
+    if (!Scene::load_shaders_from_strings(program_, vtx_shader, frg_shader))
+        return false;
+
+    program_.start();
+
+    program_["VertexLoops"] = vtx_steps;
+    program_["FragmentLoops"] = frg_steps;
+
+    std::vector<GLint> attrib_locations;
+    attrib_locations.push_back(program_["position"].location());
+    mesh_.set_attrib_locations(attrib_locations);
+
+    running_ = true;
+    startTime_ = Util::get_timestamp_us() / 1000000.0;
+    lastUpdateTime_ = startTime_;
+
+    return true;
+}
+
+Scene::ValidationResult
+SceneLoop::validate()
+{
+    static const double radius_3d(std::sqrt(3.0 * 15.0 * 15.0));
+
+    int frg_steps = Util::fromString<int>(options_["fragment-steps"].value);
+
+    Canvas::Pixel ref;
+
+    if (frg_steps == 5)
+        ref = Canvas::Pixel(0x5e, 0x5e, 0x5e, 0xff);
+    else
+        return Scene::ValidationUnknown;
+
+    Canvas::Pixel pixel = canvas_.read_pixel(293, 89);
+
+    double dist = pixel.distance_rgb(ref);
+    if (dist < radius_3d + 0.01) {
+        return Scene::ValidationSuccess;
+    }
+    else {
+        Log::debug("Validation failed! Expected: 0x%x Actual: 0x%x Distance: %f\n",
+                    ref.to_le32(), pixel.to_le32(), dist);
+        return Scene::ValidationFailure;
+    }
+
+    return Scene::ValidationUnknown;
+}
diff --git a/src/scene-pulsar.cpp b/src/scene-pulsar.cpp
new file mode 100644
index 0000000..6ab661c
--- /dev/null
+++ b/src/scene-pulsar.cpp
@@ -0,0 +1,331 @@
+/*
+ * Copyright © 2008 Ben Smith
+ * Copyright © 2010-2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Ben Smith (original glmark benchmark)
+ *  Alexandros Frantzis (glmark2)
+ *  Marc Ordinas i Llopis, Collabora Ltd. (pulsar scene)
+ *  Jesse Barker (glmark2)
+ */
+#include <stdlib.h>
+#include "scene.h"
+#include "mat.h"
+#include "stack.h"
+#include "vec.h"
+#include "log.h"
+#include "shader-source.h"
+#include "util.h"
+#include "texture.h"
+#include <cmath>
+
+using LibMatrix::vec2;
+using LibMatrix::vec3;
+using LibMatrix::vec4;
+using LibMatrix::mat4;
+using LibMatrix::Stack4;
+
+ScenePulsar::ScenePulsar(Canvas &pCanvas) :
+    Scene(pCanvas, "pulsar"),
+    numQuads_(0),
+    texture_(0)
+{
+    options_["quads"] = Scene::Option("quads", "5", "Number of quads to render");
+    options_["texture"] = Scene::Option("texture", "false", "Enable texturing",
+                                        "false,true");
+    options_["light"] = Scene::Option("light", "false", "Enable lighting",
+                                      "false,true");
+    options_["random"] = Scene::Option("random", "false", "Enable random rotation speeds",
+                                       "false,true");
+}
+
+ScenePulsar::~ScenePulsar()
+{
+}
+
+bool
+ScenePulsar::load()
+{
+    scale_ = vec3(1.0, 1.0, 1.0);
+
+    running_ = false;
+
+    return true;
+}
+
+void
+ScenePulsar::unload()
+{
+}
+
+bool
+ScenePulsar::setup()
+{
+    if (!Scene::setup())
+        return false;
+
+    // Disable back-face culling
+    glDisable(GL_CULL_FACE);
+    // Enable alpha blending
+    glEnable(GL_BLEND);
+    // Blend the colors normally, but don't change the destination alpha value.
+    glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ZERO, GL_ONE);
+
+    // Create a rotation for each quad.
+    numQuads_ = Util::fromString<int>(options_["quads"].value);
+
+    srand((unsigned)time(0));
+    for (int i = 0; i < numQuads_; i++) {
+        rotations_.push_back(vec3());
+        if (options_["random"].value == "true") {
+            rotationSpeeds_.push_back(vec3((static_cast<float>(rand()) / static_cast<float>(RAND_MAX)) * 5.0,
+                                            (static_cast<float>(rand()) / static_cast<float>(RAND_MAX)) * 5.0,
+                                             0.0));
+        }
+        else {
+            float integral;
+            float x_rot = std::modf((i + 1) * M_PI, &integral);
+            float y_rot = std::modf((i + 1) * M_E, &integral);
+            rotationSpeeds_.push_back(vec3(x_rot * 5.0,
+                                                      y_rot * 5.0,
+                                                      0.0));
+        }
+    }
+
+    // Load shaders
+    std::string vtx_shader_filename;
+    std::string frg_shader_filename;
+    static const vec4 lightPosition(-20.0f, 20.0f,-20.0f, 1.0f);
+    if (options_["light"].value == "true") {
+        vtx_shader_filename = GLMARK_DATA_PATH"/shaders/pulsar-light.vert";
+    } else {
+        vtx_shader_filename = GLMARK_DATA_PATH"/shaders/pulsar.vert";
+    }
+
+    if (options_["texture"].value == "true") {
+        frg_shader_filename = GLMARK_DATA_PATH"/shaders/light-basic-tex.frag";
+        Texture::find_textures();
+        if (!Texture::load("crate-base", &texture_, GL_NEAREST, GL_NEAREST, 0))
+            return false;
+
+    } else {
+        frg_shader_filename = GLMARK_DATA_PATH"/shaders/light-basic.frag";
+    }
+
+    ShaderSource vtx_source(vtx_shader_filename);
+    ShaderSource frg_source(frg_shader_filename);
+    if (options_["light"].value == "true") {
+        // Load the light position constant
+        vtx_source.add_const("LightSourcePosition", lightPosition);
+    }
+
+    if (!Scene::load_shaders_from_strings(program_, vtx_source.str(),
+                                          frg_source.str()))
+    {
+        return false;
+    }
+
+    create_and_setup_mesh();
+
+    program_.start();
+
+    currentFrame_ = 0;
+
+    running_ = true;
+    startTime_ = Util::get_timestamp_us() / 1000000.0;
+    lastUpdateTime_ = startTime_;
+
+    return true;
+}
+
+void
+ScenePulsar::teardown()
+{
+    program_.stop();
+    program_.release();
+
+    if (options_["texture"].value == "true") {
+        glDeleteTextures(1, &texture_);
+        texture_ = 0;
+    }
+
+    // Re-enable back-face culling
+    glEnable(GL_CULL_FACE);
+    // Disable alpha blending
+    glDisable(GL_BLEND);
+
+    mesh_.reset();
+
+    Scene::teardown();
+}
+
+void
+ScenePulsar::update()
+{
+    Scene::update();
+
+    double elapsed_time = lastUpdateTime_ - startTime_;
+
+    for (int i = 0; i < numQuads_; i++) {
+        rotations_[i] = rotationSpeeds_[i] * (elapsed_time * 60);
+    }
+
+    scale_ = vec3(cos(elapsed_time / 3.60) * 10.0, sin(elapsed_time / 3.60) * 10.0, 1.0);
+}
+
+void
+ScenePulsar::draw()
+{
+    if (options_["texture"].value == "true") {
+        glActiveTexture(GL_TEXTURE0);
+        glBindTexture(GL_TEXTURE_2D, texture_);
+    }
+
+    for (int i = 0; i < numQuads_; i++) {
+        // Load the ModelViewProjectionMatrix uniform in the shader
+        Stack4 model_view;
+        mat4 model_view_proj(canvas_.projection());
+        model_view.scale(scale_.x(), scale_.y(), scale_.z());
+        model_view.translate(0.0f, 0.0f, -10.0f);
+        model_view.rotate(rotations_[i].x(), 1.0f, 0.0f, 0.0f);
+        model_view.rotate(rotations_[i].y(), 0.0f, 1.0f, 0.0f);
+        model_view.rotate(rotations_[i].z(), 0.0f, 0.0f, 1.0f);
+        model_view_proj *= model_view.getCurrent();
+        program_["ModelViewProjectionMatrix"] = model_view_proj;
+
+        if (options_["light"].value == "true") {
+            // Load the NormalMatrix uniform in the shader. The NormalMatrix is the
+            // inverse transpose of the model view matrix.
+            mat4 normal_matrix(model_view.getCurrent());
+            normal_matrix.inverse().transpose();
+            program_["NormalMatrix"] = normal_matrix;
+        }
+
+        mesh_.render_vbo();
+    }
+}
+
+Scene::ValidationResult
+ScenePulsar::validate()
+{
+    static const double radius_3d(std::sqrt(3.0));
+
+    int quads = Util::fromString<int>(options_["quads"].value);
+
+    if (options_["texture"].value != "false" ||
+        options_["light"].value != "false" ||
+        quads != 5)
+    {
+        return Scene::ValidationUnknown;
+    }
+
+    Canvas::Pixel ref(0x77, 0x02, 0x77, 0xff);
+    Canvas::Pixel pixel = canvas_.read_pixel(400, 299);
+
+    double dist = pixel.distance_rgb(ref);
+    if (dist < radius_3d + 0.01) {
+        return Scene::ValidationSuccess;
+    }
+    else {
+        Log::debug("Validation failed! Expected: 0x%x Actual: 0x%x Distance: %f\n",
+                    ref.to_le32(), pixel.to_le32(), dist);
+        return Scene::ValidationFailure;
+    }
+
+    return Scene::ValidationUnknown;
+}
+
+void
+ScenePulsar::create_and_setup_mesh()
+{
+    bool texture = options_["texture"].value == "true";
+    bool light = options_["light"].value == "true";
+
+    struct PlaneMeshVertex {
+        vec3 position;
+        vec4 color;
+        vec2 texcoord;
+        vec3 normal;
+    };
+
+    PlaneMeshVertex plane_vertices[] = {
+        {
+          vec3(-1.0, -1.0, 0.0),
+          vec4(1.0, 0.0, 0.0, 0.4),
+          vec2(0.0, 0.0),
+          vec3(0.0, 0.0, 1.0)
+        },
+        {
+          vec3(-1.0, 1.0, 0.0),
+          vec4(0.0, 1.0, 0.0, 0.4),
+          vec2(0.0, 1.0),
+          vec3(0.0, 0.0, 1.0)
+        },
+        {
+          vec3(1.0, 1.0, 0.0),
+          vec4(0.0, 0.0, 1.0, 0.4),
+          vec2(1.0, 1.0),
+          vec3(0.0, 0.0, 1.0)
+        },
+        {
+          vec3(1.0, -1.0, 0.0),
+          vec4(1.0, 1.0, 1.0, 1.0),
+          vec2(1.0, 0.0),
+          vec3(0.0, 0.0, 1.0)
+        }
+    };
+
+    unsigned int vertex_index[] = {0, 1, 2, 0, 2, 3};
+
+    // Set vertex format
+    std::vector<int> vertex_format;
+    vertex_format.push_back(3);     // Position
+    vertex_format.push_back(4);     // Color
+    if (texture)
+        vertex_format.push_back(2); // Texcoord
+    if (light)
+        vertex_format.push_back(3); // Normal
+
+    mesh_.set_vertex_format(vertex_format);
+
+    // Build the plane mesh
+    for (size_t i = 0; i < sizeof(vertex_index) / sizeof(*vertex_index); i++) {
+        PlaneMeshVertex& vertex = plane_vertices[vertex_index[i]];
+
+        mesh_.next_vertex();
+        mesh_.set_attrib(0, vertex.position);
+        mesh_.set_attrib(1, vertex.color);
+        if (texture)
+            mesh_.set_attrib(2, vertex.texcoord);
+        if (light)
+            mesh_.set_attrib(2 + static_cast<int>(texture), vertex.normal);
+    }
+
+    mesh_.build_vbo();
+
+    // Set attribute locations
+    std::vector<GLint> attrib_locations;
+    attrib_locations.push_back(program_["position"].location());
+    attrib_locations.push_back(program_["vtxcolor"].location());
+    if (texture)
+        attrib_locations.push_back(program_["texcoord"].location());
+    if (light)
+        attrib_locations.push_back(program_["normal"].location());
+    mesh_.set_attrib_locations(attrib_locations);
+}
+
diff --git a/src/scene-refract.cpp b/src/scene-refract.cpp
new file mode 100644
index 0000000..db0aec8
--- /dev/null
+++ b/src/scene-refract.cpp
@@ -0,0 +1,469 @@
+//
+// Copyright © 2012 Linaro Limited
+//
+// This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+//
+// glmark2 is free software: you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the Free Software
+// Foundation, either version 3 of the License, or (at your option) any later
+// version.
+//
+// glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+// details.
+//
+// You should have received a copy of the GNU General Public License along with
+// glmark2.  If not, see <http://www.gnu.org/licenses/>.
+//
+// Authors:
+//  Jesse Barker
+//
+#include "scene-refract.h"
+#include "model.h"
+#include "texture.h"
+#include "util.h"
+#include "log.h"
+#include "shader-source.h"
+
+using std::string;
+using std::vector;
+using std::map;
+using LibMatrix::mat4;
+using LibMatrix::vec4;
+using LibMatrix::vec3;
+
+static const vec4 lightPosition(1.0f, 1.0f, 2.0f, 1.0f);
+
+//
+// Public interfaces
+//
+
+SceneRefract::SceneRefract(Canvas& canvas) :
+    Scene(canvas, "refract"),
+    priv_(0)
+{
+    const ModelMap& modelMap = Model::find_models();
+    string optionValues;
+    for (ModelMap::const_iterator modelIt = modelMap.begin();
+         modelIt != modelMap.end();
+         modelIt++)
+    {
+        static bool doSeparator(false);
+        if (doSeparator)
+        {
+            optionValues += ",";
+        }
+        const string& curName = modelIt->first;
+        optionValues += curName;
+        doSeparator = true;
+    }
+    options_["model"] = Scene::Option("model", "bunny", "Which model to use",
+                                      optionValues);
+    optionValues = "";
+    const TextureMap& textureMap = Texture::find_textures();
+    for (TextureMap::const_iterator textureIt = textureMap.begin();
+         textureIt != textureMap.end();
+         textureIt++)
+    {
+        static bool doSeparator(false);
+        if (doSeparator)
+        {
+            optionValues += ",";
+        }
+        const string& curName = textureIt->first;
+        optionValues += curName;
+        doSeparator = true;
+    }
+    options_["texture"] = Scene::Option("texture", "nasa1", "Which texture to use",
+                                        optionValues);
+    options_["index"] = Scene::Option("index", "1.2",
+                                      "Index of refraction of the medium to simulate");
+    options_["use-vbo"] = Scene::Option("use-vbo", "true",
+                                        "Whether to use VBOs for rendering",
+                                        "false,true");
+    options_["interleave"] = Scene::Option("interleave", "false",
+                                           "Whether to interleave vertex attribute data",
+                                           "false,true");
+}
+
+bool
+SceneRefract::supported(bool show_errors)
+{
+    static const string oes_depth_texture("GL_OES_depth_texture");
+    static const string arb_depth_texture("GL_ARB_depth_texture");
+    if (!GLExtensions::support(oes_depth_texture) &&
+        !GLExtensions::support(arb_depth_texture)) {
+        if (show_errors) {
+            Log::error("We do not have the depth texture extension!!!\n");
+        }
+
+        return false;
+    }
+    return true;
+}
+
+bool
+SceneRefract::load()
+{
+    running_ = false;
+    return true;
+}
+
+void
+SceneRefract::unload()
+{
+}
+
+bool
+SceneRefract::setup()
+{
+    // If the scene isn't supported, don't bother to go through setup.
+    if (!supported(false) || !Scene::setup())
+    {
+        return false;
+    }
+
+    priv_ = new RefractPrivate(canvas_);
+    if (!priv_->setup(options_)) {
+        delete priv_;
+        priv_ = 0;
+        return false;
+    }
+
+    // Set core scene timing after actual initialization so we don't measure
+    // set up time.
+    startTime_ = Util::get_timestamp_us() / 1000000.0;
+    lastUpdateTime_ = startTime_;
+    running_ = true;
+
+    return true;
+}
+
+void
+SceneRefract::teardown()
+{
+    // Add scene-specific teardown here
+    priv_->teardown();
+    delete priv_;
+    Scene::teardown();
+}
+
+void
+SceneRefract::update()
+{
+    Scene::update();
+    // Add scene-specific update here
+    priv_->update(lastUpdateTime_ - startTime_);
+}
+
+void
+SceneRefract::draw()
+{
+    priv_->draw();
+}
+
+Scene::ValidationResult
+SceneRefract::validate()
+{
+    return Scene::ValidationUnknown;
+}
+
+//
+// Private interfaces
+//
+
+bool
+DistanceRenderTarget::setup(unsigned int width, unsigned int height)
+{
+    canvas_width_ = width;
+    canvas_height_ = height;
+    width_ = canvas_width_ * 2;
+    height_ = canvas_height_ * 2;
+
+    static const string vtx_shader_filename(GLMARK_DATA_PATH"/shaders/depth.vert");
+    static const string frg_shader_filename(GLMARK_DATA_PATH"/shaders/depth.frag");
+
+    ShaderSource vtx_source(vtx_shader_filename);
+    ShaderSource frg_source(frg_shader_filename);
+
+    if (!Scene::load_shaders_from_strings(program_, vtx_source.str(), frg_source.str())) {
+        return false;
+    }
+
+    glGenTextures(2, &tex_[0]);
+    glBindTexture(GL_TEXTURE_2D, tex_[DEPTH]);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, width_, height_, 0,
+                 GL_DEPTH_COMPONENT, GL_UNSIGNED_INT, 0);
+    glBindTexture(GL_TEXTURE_2D, tex_[COLOR]);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width_, height_, 0,
+                 GL_RGBA, GL_UNSIGNED_BYTE, 0);
+    glGenerateMipmap(GL_TEXTURE_2D);
+    glBindTexture(GL_TEXTURE_2D, 0);
+
+    glGenFramebuffers(1, &fbo_);
+    glBindFramebuffer(GL_FRAMEBUFFER, fbo_);
+    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D,
+                           tex_[DEPTH], 0);
+    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
+                           tex_[COLOR], 0);
+    unsigned int status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
+    if (status != GL_FRAMEBUFFER_COMPLETE) {
+        Log::error("DepthRenderState::setup: glCheckFramebufferStatus failed (0x%x)\n", status);
+        return false;
+    }
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+
+    return true;
+}
+
+void
+DistanceRenderTarget::teardown()
+{
+    program_.stop();
+    program_.release();
+    if (tex_) {
+        glDeleteTextures(2, &tex_[0]);
+        tex_[DEPTH] = tex_[COLOR] = 0;
+    }
+    if (fbo_) {
+        glDeleteFramebuffers(1, &fbo_);
+        fbo_ = 0;
+    }
+}
+
+void
+DistanceRenderTarget::enable(const mat4& mvp)
+{
+    program_.start();
+    program_["ModelViewProjectionMatrix"] = mvp;
+    glBindFramebuffer(GL_FRAMEBUFFER, fbo_);
+    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D,
+                           tex_[DEPTH], 0);
+    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
+                           tex_[COLOR], 0);
+    glViewport(0, 0, width_, height_);
+    glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
+    glCullFace(GL_FRONT);
+}
+
+void DistanceRenderTarget::disable()
+{
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+    glViewport(0, 0, canvas_width_, canvas_height_);
+    glCullFace(GL_BACK);
+}
+
+bool
+RefractPrivate::setup(map<string, Scene::Option>& options)
+{
+    // Program object setup
+    static const string vtx_shader_filename(GLMARK_DATA_PATH"/shaders/light-refract.vert");
+    static const string frg_shader_filename(GLMARK_DATA_PATH"/shaders/light-refract.frag");
+    static const vec4 lightColor(0.4, 0.4, 0.4, 1.0);
+
+    ShaderSource vtx_source(vtx_shader_filename);
+    ShaderSource frg_source(frg_shader_filename);
+
+    frg_source.add_const("LightColor", lightColor);
+    frg_source.add_const("LightSourcePosition", lightPosition);
+    float refractive_index(Util::fromString<float>(options["index"].value));
+    frg_source.add_const("RefractiveIndex", refractive_index);
+
+    if (!Scene::load_shaders_from_strings(program_, vtx_source.str(), frg_source.str())) {
+        return false;
+    }
+
+    const string& whichTexture(options["texture"].value);
+    if (!Texture::load(whichTexture, &texture_, GL_LINEAR, GL_LINEAR, 0))
+        return false;
+
+    // Model setup
+    Model model;
+    const string& whichModel(options["model"].value);
+    bool modelLoaded = model.load(whichModel);
+
+    if(!modelLoaded)
+        return false;
+
+    // Now that we're successfully loaded, there are a few quirks about
+    // some of the known models that we need to account for.  The draw
+    // logic for the scene wants to rotate the model around the Y axis.
+    // Most of our models are described this way.  Some need adjustment
+    // (an additional rotation that gets the model into the correct
+    // orientation).
+    //
+    // Here's a summary:
+    //
+    // Angel rotates around the Y axis
+    // Armadillo rotates around the Y axis
+    // Buddha rotates around the X axis
+    // Bunny rotates around the Y axis
+    // Dragon rotates around the X axis
+    // Horse rotates around the Y axis
+    if (whichModel == "buddha" || whichModel == "dragon")
+    {
+        orientModel_ = true;
+        orientationAngle_ = -90.0;
+        orientationVec_ = vec3(1.0, 0.0, 0.0);
+    }
+    else if (whichModel == "armadillo")
+    {
+        orientModel_ = true;
+        orientationAngle_ = 180.0; 
+        orientationVec_ = vec3(0.0, 1.0, 0.0);
+    }
+
+    model.calculate_normals();
+
+    // Mesh setup
+    vector<std::pair<Model::AttribType, int> > attribs;
+    attribs.push_back(std::pair<Model::AttribType, int>(Model::AttribTypePosition, 3));
+    attribs.push_back(std::pair<Model::AttribType, int>(Model::AttribTypeNormal, 3));
+    model.convert_to_mesh(mesh_, attribs);
+
+    useVbo_ = (options["use-vbo"].value == "true");
+    bool interleave = (options["interleave"].value == "true");
+    mesh_.vbo_update_method(Mesh::VBOUpdateMethodMap);
+    mesh_.interleave(interleave);
+
+    if (useVbo_) {
+        mesh_.build_vbo();
+    }
+    else {
+        mesh_.build_array();
+    }
+
+    // Calculate a projection matrix that is a good fit for the model
+    vec3 maxVec = model.maxVec();
+    vec3 minVec = model.minVec();
+    vec3 diffVec = maxVec - minVec;
+    centerVec_ = maxVec + minVec;
+    centerVec_ /= 2.0;
+    float diameter = diffVec.length();
+    radius_ = diameter / 2;
+    float fovy = 2.0 * atanf(radius_ / (2.0 + radius_));
+    fovy /= M_PI;
+    fovy *= 180.0;
+    float aspect(static_cast<float>(canvas_.width())/static_cast<float>(canvas_.height()));
+    projection_.perspective(fovy, aspect, 2.0, 2.0 + diameter);
+
+    // Set up the light matrix with a bias that will convert values
+    // in the range of [-1, 1] to [0, 1)], then add in the projection
+    // and the "look at" matrix from the light position.
+    light_ *= LibMatrix::Mat4::translate(0.5, 0.5, 0.5);
+    light_ *= LibMatrix::Mat4::scale(0.5, 0.5, 0.5);
+    light_ *= projection_.getCurrent();
+    light_ *= LibMatrix::Mat4::lookAt(lightPosition.x(), lightPosition.y(), lightPosition.z(),
+                                      0.0, 0.0, 0.0,
+                                      0.0, 1.0, 0.0);
+
+    if (!depthTarget_.setup(canvas_.width(), canvas_.height())) {
+        Log::error("Failed to set up the render target for the depth pass\n");
+        return false;
+    }
+
+    return true;
+}
+void
+RefractPrivate::teardown()
+{
+    depthTarget_.teardown();
+    program_.stop();
+    program_.release();
+    mesh_.reset();
+}
+
+void
+RefractPrivate::update(double elapsedTime)
+{
+    rotation_ = rotationSpeed_ * elapsedTime;
+}
+
+void
+RefractPrivate::draw()
+{
+    // To perform the depth pass, set up the model-view transformation so
+    // that we're looking at the horse from the light position.  That will
+    // give us the appropriate view for the shadow.
+    modelview_.push();
+    modelview_.loadIdentity();
+    modelview_.lookAt(lightPosition.x(), lightPosition.y(), lightPosition.z(),
+                      0.0, 0.0, 0.0,
+                      0.0, 1.0, 0.0);
+    modelview_.rotate(rotation_, 0.0f, 1.0f, 0.0f);
+    if (orientModel_)
+    {
+        modelview_.rotate(orientationAngle_, orientationVec_.x(), orientationVec_.y(), orientationVec_.z());
+    }
+    mat4 mvp(projection_.getCurrent());
+    mvp *= modelview_.getCurrent();
+    modelview_.pop();
+
+    // Enable the depth render target with our transformation and render.
+    depthTarget_.enable(mvp);
+    vector<GLint> attrib_locations;
+    attrib_locations.push_back(depthTarget_.program()["position"].location());
+    attrib_locations.push_back(depthTarget_.program()["normal"].location());
+    mesh_.set_attrib_locations(attrib_locations);
+    if (useVbo_) {
+        mesh_.render_vbo();
+    }
+    else {
+        mesh_.render_array();
+    }
+    depthTarget_.disable();
+
+    // Draw the "normal" view of the horse
+    modelview_.push();
+    modelview_.translate(-centerVec_.x(), -centerVec_.y(), -(centerVec_.z() + 2.0 + radius_));
+    modelview_.rotate(rotation_, 0.0f, 1.0f, 0.0f);
+    if (orientModel_)
+    {
+        modelview_.rotate(orientationAngle_, orientationVec_.x(), orientationVec_.y(), orientationVec_.z());
+    }
+    mvp = projection_.getCurrent();
+    mvp *= modelview_.getCurrent();
+
+    program_.start();
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, depthTarget_.depthTexture());
+    program_["DistanceMap"] = 0;
+    glActiveTexture(GL_TEXTURE1);
+    glBindTexture(GL_TEXTURE_2D, depthTarget_.colorTexture());
+    program_["NormalMap"] = 1;
+    glActiveTexture(GL_TEXTURE2);
+    glBindTexture(GL_TEXTURE_2D, texture_);
+    program_["ImageMap"] = 2;
+    // Load both the modelview*projection as well as the modelview matrix itself
+    program_["ModelViewProjectionMatrix"] = mvp;
+    program_["ModelViewMatrix"] = modelview_.getCurrent();
+    // Load the NormalMatrix uniform in the shader. The NormalMatrix is the
+    // inverse transpose of the model view matrix.
+    mat4 normal_matrix(modelview_.getCurrent());
+    normal_matrix.inverse().transpose();
+    program_["NormalMatrix"] = normal_matrix;
+    program_["LightMatrix"] = light_;
+    attrib_locations.clear();
+    attrib_locations.push_back(program_["position"].location());
+    attrib_locations.push_back(program_["normal"].location());
+    mesh_.set_attrib_locations(attrib_locations);
+    if (useVbo_) {
+        mesh_.render_vbo();
+    }
+    else {
+        mesh_.render_array();
+    }
+
+    // Per-frame cleanup
+    modelview_.pop();
+}
+
diff --git a/src/scene-refract.h b/src/scene-refract.h
new file mode 100644
index 0000000..660678b
--- /dev/null
+++ b/src/scene-refract.h
@@ -0,0 +1,106 @@
+//
+// Copyright © 2012 Linaro Limited
+//
+// This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+//
+// glmark2 is free software: you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the Free Software
+// Foundation, either version 3 of the License, or (at your option) any later
+// version.
+//
+// glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+// details.
+//
+// You should have received a copy of the GNU General Public License along with
+// glmark2.  If not, see <http://www.gnu.org/licenses/>.
+//
+// Authors:
+//  Jesse Barker
+//
+#ifndef SCENE_REFRACT_
+#define SCENE_REFRACT_
+
+#include "scene.h"
+#include "stack.h"
+
+//
+// To create a shadow map, we need a framebuffer object set up for a 
+// depth-only pass.  The render target can then be bound as a texture,
+// and the depth values sampled from that texture can be used in the
+// distance-from-light computations when rendering the shadow on the
+// ground below the rendered object.
+//
+class DistanceRenderTarget
+{
+    enum
+    {
+        DEPTH = 0,
+        COLOR
+    };
+    Program program_;
+    unsigned int canvas_width_;
+    unsigned int canvas_height_;
+    unsigned int width_;
+    unsigned int height_;
+    unsigned int tex_[2];
+    unsigned int fbo_;
+public:
+    DistanceRenderTarget() :
+        canvas_width_(0),
+        canvas_height_(0),
+        width_(0),
+        height_(0),
+        fbo_(0)
+    {
+        tex_[DEPTH] = tex_[COLOR] = 0;
+    }
+    ~DistanceRenderTarget() {}
+    bool setup(unsigned int width, unsigned int height);
+    void teardown();
+    void enable(const LibMatrix::mat4& mvp);
+    void disable();
+    unsigned int depthTexture() { return tex_[DEPTH]; }
+    unsigned int colorTexture() { return tex_[COLOR]; }
+    Program& program() { return program_; }
+};
+
+class RefractPrivate
+{
+    Canvas& canvas_;
+    DistanceRenderTarget depthTarget_;
+    Program program_;
+    LibMatrix::Stack4 modelview_;
+    LibMatrix::Stack4 projection_;
+    LibMatrix::mat4 light_;
+    Mesh mesh_;
+    LibMatrix::vec3 centerVec_;
+    bool orientModel_;
+    float orientationAngle_;
+    LibMatrix::vec3 orientationVec_;
+    float radius_;
+    float rotation_;
+    float rotationSpeed_;
+    unsigned int texture_;
+    bool useVbo_;
+    
+public:
+    RefractPrivate(Canvas& canvas) :
+        canvas_(canvas),
+        orientModel_(false),
+        orientationAngle_(0.0),
+        radius_(0.0),
+        rotation_(0.0),
+        rotationSpeed_(36.0),
+        texture_(0),
+        useVbo_(true) {}
+    ~RefractPrivate() {}
+
+    bool setup(std::map<std::string, Scene::Option>& options);
+    void teardown();
+    void update(double elapsedTime);
+    void draw();
+};
+
+#endif // SCENE_REFRACT_
diff --git a/src/scene-shading.cpp b/src/scene-shading.cpp
new file mode 100644
index 0000000..22b5ad5
--- /dev/null
+++ b/src/scene-shading.cpp
@@ -0,0 +1,346 @@
+/*
+ * Copyright © 2008 Ben Smith
+ * Copyright © 2010-2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Ben Smith (original glmark benchmark)
+ *  Alexandros Frantzis (glmark2)
+ *  Jesse Barker (glmark2)
+ */
+#include "scene.h"
+#include "mat.h"
+#include "stack.h"
+#include "vec.h"
+#include "log.h"
+#include "util.h"
+#include "shader-source.h"
+#include "model.h"
+
+#include <cmath>
+#include <sstream>
+
+using LibMatrix::vec3;
+using std::string;
+using std::endl;
+
+SceneShading::SceneShading(Canvas &pCanvas) :
+    Scene(pCanvas, "shading"),
+    orientModel_(false)
+{
+    const ModelMap& modelMap = Model::find_models();
+    std::string optionValues;
+    for (ModelMap::const_iterator modelIt = modelMap.begin();
+         modelIt != modelMap.end();
+         modelIt++)
+    {
+        static bool doSeparator(false);
+        if (doSeparator)
+        {
+            optionValues += ",";
+        }
+        const std::string& curName = modelIt->first;
+        optionValues += curName;
+        doSeparator = true;
+    }
+    options_["shading"] = Scene::Option("shading", "gouraud",
+                                        "Which shading method to use",
+                                        "gouraud,blinn-phong-inf,phong");
+    options_["num-lights"] = Scene::Option("num-lights", "1",
+            "The number of lights applied to the scene (phong only)");
+    options_["model"] = Scene::Option("model", "cat", "Which model to use",
+                                      optionValues);
+}
+
+SceneShading::~SceneShading()
+{
+}
+
+bool
+SceneShading::load()
+{
+    rotationSpeed_ = 36.0f;
+
+    running_ = false;
+
+    return true;
+}
+
+void
+SceneShading::unload()
+{
+    mesh_.reset();
+}
+
+static string
+get_fragment_shader_source(const string& frg_file, unsigned int lights)
+{
+    ShaderSource source(frg_file);
+
+    static const string lightPositionName("LightSourcePosition");
+    static const string lightColorName("LightColor");
+    static const string callCompute("    gl_FragColor += compute_color(");
+    static const string commaString(", ");
+    static const string rParenString(");");
+    std::stringstream doLightSS;
+    doLightSS << string("    gl_FragColor = vec4(0.0, 0.0, 0.0, 0.0);");
+    doLightSS << endl;
+    float theta(2.0 * M_PI / lights);
+    float phi(theta / 2.0);
+    float intensity(0.8 / lights);
+    LibMatrix::vec4 lightCol(intensity, intensity, intensity, 1.0);
+    for (unsigned int l = 0; l < lights; l++)
+    {
+        // Construct constant names for the light position and color and add it
+        // to the list of constants for the shader.
+        string indexString(Util::toString(l));
+        string curLightPosition(lightPositionName + indexString);
+        string curLightColor(lightColorName + indexString);
+        float sin_theta(sin(theta * l));
+        float cos_theta(cos(theta * l));
+        float sin_phi(sin(phi * l));
+        float cos_phi(cos(phi * l));
+        LibMatrix::vec4 lightPos(cos_phi * sin_theta, cos_phi * cos_theta, sin_phi, 1.0);
+        source.add_const(curLightPosition, lightPos);
+        source.add_const(curLightColor, lightCol);
+
+        // Add the section of source to the substantive...
+        doLightSS << callCompute;
+        doLightSS << curLightPosition;
+        doLightSS << commaString;
+        doLightSS << curLightColor;
+        doLightSS << rParenString;
+        doLightSS << endl;
+    }
+
+    source.replace("$DO_LIGHTS$", doLightSS.str());
+
+    return source.str();
+}
+
+bool
+SceneShading::setup()
+{
+    if (!Scene::setup())
+        return false;
+
+    static const LibMatrix::vec4 lightPosition(20.0f, 20.0f, 10.0f, 1.0f);
+    static const LibMatrix::vec4 materialDiffuse(0.0f, 0.0f, 1.0f, 1.0f);
+
+    // Calculate half vector for blinn-phong shading model
+    LibMatrix::vec3 halfVector(lightPosition[0], lightPosition[1], lightPosition[2]);
+    halfVector.normalize();
+    halfVector += LibMatrix::vec3(0.0, 0.0, 1.0);
+    halfVector.normalize();
+
+    // Load and add constants to shaders
+    std::string vtx_shader_filename;
+    std::string frg_shader_filename;
+    const std::string &shading = options_["shading"].value;
+    ShaderSource vtx_source;
+    ShaderSource frg_source;
+    if (shading == "gouraud") {
+        vtx_shader_filename = GLMARK_DATA_PATH"/shaders/light-basic.vert";
+        frg_shader_filename = GLMARK_DATA_PATH"/shaders/light-basic.frag";
+        frg_source.append_file(frg_shader_filename);
+        vtx_source.append_file(vtx_shader_filename);
+        vtx_source.add_const("LightSourcePosition", lightPosition);
+        vtx_source.add_const("MaterialDiffuse", materialDiffuse);
+    }
+    else if (shading == "blinn-phong-inf") {
+        vtx_shader_filename = GLMARK_DATA_PATH"/shaders/light-advanced.vert";
+        frg_shader_filename = GLMARK_DATA_PATH"/shaders/light-advanced.frag";
+        frg_source.append_file(frg_shader_filename);
+        frg_source.add_const("LightSourcePosition", lightPosition);
+        frg_source.add_const("LightSourceHalfVector", halfVector);
+        vtx_source.append_file(vtx_shader_filename);
+    }
+    else if (shading == "phong") {
+        vtx_shader_filename = GLMARK_DATA_PATH"/shaders/light-phong.vert";
+        frg_shader_filename = GLMARK_DATA_PATH"/shaders/light-phong.frag";
+        unsigned int num_lights = Util::fromString<unsigned int>(options_["num-lights"].value);
+        string fragsource = get_fragment_shader_source(frg_shader_filename, num_lights);
+        frg_source.append(fragsource);
+        frg_source.add_const("MaterialDiffuse", materialDiffuse);
+        vtx_source.append_file(vtx_shader_filename);
+    }
+
+    if (!Scene::load_shaders_from_strings(program_, vtx_source.str(),
+                                          frg_source.str()))
+    {
+        return false;
+    }
+
+    Model model;
+    const std::string& whichModel(options_["model"].value);
+    bool modelLoaded = model.load(whichModel);
+
+    if(!modelLoaded)
+        return false;
+
+    // Now that we're successfully loaded, there are a few quirks about
+    // some of the known models that we need to account for.  The draw
+    // logic for the scene wants to rotate the model around the Y axis.
+    // Most of our models are described this way.  Some need adjustment
+    // (an additional rotation that gets the model into the correct
+    // orientation).
+    //
+    // Here's a summary:
+    //
+    // Angel rotates around the Y axis
+    // Armadillo rotates around the Y axis
+    // Buddha rotates around the X axis
+    // Bunny rotates around the Y axis
+    // Dragon rotates around the X axis
+    // Horse rotates around the Y axis
+    if (whichModel == "buddha" || whichModel == "dragon")
+    {
+        orientModel_ = true;
+        orientationAngle_ = -90.0;
+        orientationVec_ = vec3(1.0, 0.0, 0.0);
+    }
+    else if (whichModel == "armadillo")
+    {
+        orientModel_ = true;
+        orientationAngle_ = 180.0; 
+        orientationVec_ = vec3(0.0, 1.0, 0.0);
+    }
+
+    model.calculate_normals();
+
+    /* Tell the converter that we only care about position and normal attributes */
+    std::vector<std::pair<Model::AttribType, int> > attribs;
+    attribs.push_back(std::pair<Model::AttribType, int>(Model::AttribTypePosition, 3));
+    attribs.push_back(std::pair<Model::AttribType, int>(Model::AttribTypeNormal, 3));
+
+    model.convert_to_mesh(mesh_, attribs);
+
+    mesh_.build_vbo();
+
+    /* Calculate a projection matrix that is a good fit for the model */
+    vec3 maxVec = model.maxVec();
+    vec3 minVec = model.minVec();
+    vec3 diffVec = maxVec - minVec;
+    centerVec_ = maxVec + minVec;
+    centerVec_ /= 2.0;
+    float diameter = diffVec.length();
+    radius_ = diameter / 2;
+    float fovy = 2.0 * atanf(radius_ / (2.0 + radius_));
+    fovy /= M_PI;
+    fovy *= 180.0;
+    float aspect(static_cast<float>(canvas_.width())/static_cast<float>(canvas_.height()));
+    perspective_.setIdentity();
+    perspective_ *= LibMatrix::Mat4::perspective(fovy, aspect, 2.0, 2.0 + diameter);
+
+    program_.start();
+
+    std::vector<GLint> attrib_locations;
+    attrib_locations.push_back(program_["position"].location());
+    attrib_locations.push_back(program_["normal"].location());
+    mesh_.set_attrib_locations(attrib_locations);
+
+    currentFrame_ = 0;
+    rotation_ = 0.0f;
+    running_ = true;
+    startTime_ = Util::get_timestamp_us() / 1000000.0;
+    lastUpdateTime_ = startTime_;
+
+    return true;
+}
+
+void
+SceneShading::teardown()
+{
+    program_.stop();
+    program_.release();
+
+    Scene::teardown();
+}
+
+void
+SceneShading::update()
+{
+    Scene::update();
+
+    double elapsed_time = lastUpdateTime_ - startTime_;
+
+    rotation_ = rotationSpeed_ * elapsed_time;
+}
+
+void
+SceneShading::draw()
+{
+    // Load the ModelViewProjectionMatrix uniform in the shader
+    LibMatrix::Stack4 model_view;
+    model_view.translate(-centerVec_.x(), -centerVec_.y(), -(centerVec_.z() + 2.0 + radius_));
+    model_view.rotate(rotation_, 0.0f, 1.0f, 0.0f);
+    if (orientModel_)
+    {
+        model_view.rotate(orientationAngle_, orientationVec_.x(), orientationVec_.y(), orientationVec_.z());
+    }
+    LibMatrix::mat4 model_view_proj(perspective_);
+    model_view_proj *= model_view.getCurrent();
+
+    program_["ModelViewProjectionMatrix"] = model_view_proj;
+
+    // Load the NormalMatrix uniform in the shader. The NormalMatrix is the
+    // inverse transpose of the model view matrix.
+    LibMatrix::mat4 normal_matrix(model_view.getCurrent());
+    normal_matrix.inverse().transpose();
+    program_["NormalMatrix"] = normal_matrix;
+
+    // Load the modelview matrix itself
+    program_["ModelViewMatrix"] = model_view.getCurrent();
+
+    mesh_.render_vbo();
+}
+
+Scene::ValidationResult
+SceneShading::validate()
+{
+    static const double radius_3d(std::sqrt(3.0));
+
+    if (rotation_ != 0)
+        return Scene::ValidationUnknown;
+
+    Canvas::Pixel ref;
+
+    Canvas::Pixel pixel = canvas_.read_pixel(canvas_.width() / 3,
+                                             canvas_.height() / 3);
+
+    const std::string &filter = options_["shading"].value;
+
+    if (filter == "gouraud")
+        ref = Canvas::Pixel(0x00, 0x00, 0x2d, 0xff);
+    else if (filter == "blinn-phong-inf")
+        ref = Canvas::Pixel(0x1a, 0x1a, 0x3e, 0xff);
+    else if (filter == "phong" && options_["num-lights"].value == "1")
+        ref = Canvas::Pixel(0x05, 0x05, 0xad, 0xff);
+    else
+        return Scene::ValidationUnknown;
+
+    double dist = pixel.distance_rgb(ref);
+
+    if (dist < radius_3d + 0.01) {
+        return Scene::ValidationSuccess;
+    }
+    else {
+        Log::debug("Validation failed! Expected: 0x%x Actual: 0x%x Distance: %f\n",
+                    ref.to_le32(), pixel.to_le32(), dist);
+        return Scene::ValidationFailure;
+    }
+}
diff --git a/src/scene-shadow.cpp b/src/scene-shadow.cpp
new file mode 100644
index 0000000..dbad8a4
--- /dev/null
+++ b/src/scene-shadow.cpp
@@ -0,0 +1,546 @@
+//
+// Copyright © 2012 Linaro Limited
+//
+// This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+//
+// glmark2 is free software: you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the Free Software
+// Foundation, either version 3 of the License, or (at your option) any later
+// version.
+//
+// glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+// details.
+//
+// You should have received a copy of the GNU General Public License along with
+// glmark2.  If not, see <http://www.gnu.org/licenses/>.
+//
+// Authors:
+//  Jesse Barker
+//
+#include "scene.h"
+#include "model.h"
+#include "util.h"
+#include "log.h"
+#include "shader-source.h"
+#include "stack.h"
+
+using std::string;
+using std::vector;
+using std::map;
+using LibMatrix::Stack4;
+using LibMatrix::mat4;
+using LibMatrix::vec4;
+using LibMatrix::vec3;
+using LibMatrix::vec2;
+
+static const vec4 lightPosition(0.0f, 3.0f, 2.0f, 1.0f);
+
+//
+// To create a shadow map, we need a framebuffer object set up for a 
+// depth-only pass.  The render target can then be bound as a texture,
+// and the depth values sampled from that texture can be used in the
+// distance-from-light computations when rendering the shadow on the
+// ground below the rendered object.
+//
+class DepthRenderTarget
+{
+    Program program_;
+    unsigned int canvas_width_;
+    unsigned int canvas_height_;
+    unsigned int width_;
+    unsigned int height_;
+    unsigned int tex_;
+    unsigned int fbo_;
+public:
+    DepthRenderTarget() :
+        canvas_width_(0),
+        canvas_height_(0),
+        width_(0),
+        height_(0),
+        tex_(0),
+        fbo_(0) {}
+    ~DepthRenderTarget() {}
+    bool setup(unsigned int width, unsigned int height);
+    void teardown();
+    void enable(const mat4& mvp);
+    void disable();
+    unsigned int texture() { return tex_; }
+    Program& program() { return program_; }
+};
+
+bool
+DepthRenderTarget::setup(unsigned int width, unsigned int height)
+{
+    canvas_width_ = width;
+    canvas_height_ = height;
+    width_ = canvas_width_ * 2;
+    height_ = canvas_height_ * 2;
+
+    static const string vtx_shader_filename(GLMARK_DATA_PATH"/shaders/depth.vert");
+    static const string frg_shader_filename(GLMARK_DATA_PATH"/shaders/depth.frag");
+
+    ShaderSource vtx_source(vtx_shader_filename);
+    ShaderSource frg_source(frg_shader_filename);
+
+    if (!Scene::load_shaders_from_strings(program_, vtx_source.str(), frg_source.str())) {
+        return false;
+    }
+
+    glGenTextures(1, &tex_);
+    glBindTexture(GL_TEXTURE_2D, tex_);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, width_, height_, 0,
+                 GL_DEPTH_COMPONENT, GL_UNSIGNED_INT, 0);
+    glBindTexture(GL_TEXTURE_2D, 0);
+
+    glGenFramebuffers(1, &fbo_);
+    glBindFramebuffer(GL_FRAMEBUFFER, fbo_);
+    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D,
+                           tex_, 0);
+    unsigned int status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
+    if (status != GL_FRAMEBUFFER_COMPLETE) {
+        Log::error("DepthRenderState::setup: glCheckFramebufferStatus failed (0x%x)\n", status);
+        return false;
+    }
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+
+    return true;
+}
+
+void
+DepthRenderTarget::teardown()
+{
+    program_.stop();
+    program_.release();
+    if (tex_) {
+        glDeleteTextures(1, &tex_);
+        tex_ = 0;
+    }
+    if (fbo_) {
+        glDeleteFramebuffers(1, &fbo_);
+        fbo_ = 0;
+    }
+}
+
+void
+DepthRenderTarget::enable(const mat4& mvp)
+{
+    program_.start();
+    program_["ModelViewProjectionMatrix"] = mvp;
+    glBindFramebuffer(GL_FRAMEBUFFER, fbo_);
+    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D,
+                           tex_, 0);
+    glViewport(0, 0, width_, height_);
+    glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
+    glClear(GL_DEPTH_BUFFER_BIT);
+}
+
+void DepthRenderTarget::disable()
+{
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+    glViewport(0, 0, canvas_width_, canvas_height_);
+    glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
+}
+
+//
+// The actual shadow pass is really just a quad projected into the scene
+// with the horse's shadow cast upon it.  In the vertex stage, we compute
+// a texture coordinate for the depth texture look-up by transforming the
+// current vertex position using a matrix describing the light's view point.
+// In the fragment stage, that coordinate is perspective corrected, and
+// used to sample the depth texture.  If the depth value for that fragment
+// (effectively the distance from the light to the object at that point)
+// is less than the Z component of that coordinate (effectively the distance
+// from the light to the ground at that point) then that location is in shadow.
+//
+class GroundRenderer
+{
+    Program program_;
+    mat4 light_;
+    Stack4 modelview_;
+    mat4 projection_;
+    int positionLocation_;
+    unsigned int bufferObject_;
+    unsigned int texture_;
+    vector<vec2> vertices_;
+    vector<vec2> texcoords_;
+    
+public:
+    GroundRenderer() :
+        positionLocation_(0),
+        bufferObject_(0) {}
+    ~GroundRenderer() {}
+    bool setup(const mat4& projection, unsigned int texture);
+    void teardown();
+    void draw();
+};
+
+bool
+GroundRenderer::setup(const mat4& projection, unsigned int texture)
+{
+    projection_ = projection;
+    texture_ = texture;
+
+    // Program set up
+    static const vec4 materialDiffuse(0.3f, 0.3f, 0.3f, 1.0f);
+    static const string vtx_shader_filename(GLMARK_DATA_PATH"/shaders/shadow.vert");
+    static const string frg_shader_filename(GLMARK_DATA_PATH"/shaders/shadow.frag");
+    ShaderSource vtx_source(vtx_shader_filename);
+    ShaderSource frg_source(frg_shader_filename);
+
+    vtx_source.add_const("MaterialDiffuse", materialDiffuse);
+
+    if (!Scene::load_shaders_from_strings(program_, vtx_source.str(), frg_source.str())) {
+        return false;
+    }
+    positionLocation_ = program_["position"].location();
+
+    // Set up the position data for our "quad".
+    vertices_.push_back(vec2(-1.0, -1.0));
+    vertices_.push_back(vec2(1.0, -1.0));
+    vertices_.push_back(vec2(-1.0, 1.0));
+    vertices_.push_back(vec2(1.0, 1.0));
+
+    // Set up the VBO and stash our position data in it.
+    glGenBuffers(1, &bufferObject_);
+    glBindBuffer(GL_ARRAY_BUFFER, bufferObject_);
+    glBufferData(GL_ARRAY_BUFFER, vertices_.size() * sizeof(vec2),
+                 &vertices_.front(), GL_STATIC_DRAW);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+
+    // Set up the light matrix with a bias that will convert values
+    // in the range of [-1, 1] to [0, 1)], then add in the projection
+    // and the "look at" matrix from the light position.
+    light_ *= LibMatrix::Mat4::translate(0.5, 0.5, 0.5);
+    light_ *= LibMatrix::Mat4::scale(0.5, 0.5, 0.5);
+    light_ *= projection_;
+    light_ *= LibMatrix::Mat4::lookAt(lightPosition.x(), lightPosition.y(), lightPosition.z(),
+                                      0.0, 0.0, 0.0,
+                                      0.0, 1.0, 0.0);
+
+    return true;
+}
+
+void
+GroundRenderer::teardown()
+{
+    program_.stop();
+    program_.release();
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    glDeleteBuffers(1, &bufferObject_);
+    bufferObject_ = 0;
+    texture_= 0;
+    vertices_.clear();
+}
+
+void
+GroundRenderer::draw()
+{
+    // Need to add uniforms for the shadow texture, and transformation to
+    // "lay the quad down".
+    modelview_.push();
+    modelview_.translate(projection_[0][3], projection_[1][3] - 0.8, projection_[2][3] - 0.5);
+    modelview_.rotate(-85.0, 1.0, 0.0, 0.0);
+    modelview_.scale(2.0, 2.0, 2.0);
+    mat4 mvp(projection_);
+    mvp *= modelview_.getCurrent();
+
+    glBindBuffer(GL_ARRAY_BUFFER, bufferObject_);
+    program_.start();
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, texture_);
+    program_["ShadowMap"] = 0;
+    program_["LightMatrix"] = light_;
+    program_["ModelViewProjectionMatrix"] = mvp;
+
+    glEnableVertexAttribArray(positionLocation_);
+    glVertexAttribPointer(positionLocation_, 2, GL_FLOAT, GL_FALSE, 0, 0);
+    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+    glDisableVertexAttribArray(positionLocation_);
+    glBindTexture(GL_TEXTURE_2D, 0);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    modelview_.pop();
+}
+
+class ShadowPrivate
+{
+    Canvas& canvas_;
+    DepthRenderTarget depthTarget_;
+    GroundRenderer ground_;
+    Program program_;
+    Stack4 modelview_;
+    Stack4 projection_;
+    Mesh mesh_;
+    vec3 centerVec_;
+    float radius_;
+    float rotation_;
+    float rotationSpeed_;
+    bool useVbo_;
+    
+public:
+    ShadowPrivate(Canvas& canvas) :
+        canvas_(canvas),
+        radius_(0.0),
+        rotation_(0.0),
+        rotationSpeed_(36.0),
+        useVbo_(true) {}
+    ~ShadowPrivate() {}
+
+    bool setup(map<string, Scene::Option>& options);
+    void teardown();
+    void update(double elapsedTime);
+    void draw();
+};
+
+bool
+ShadowPrivate::setup(map<string, Scene::Option>& options)
+{
+    // Program object setup
+    static const string vtx_shader_filename(GLMARK_DATA_PATH"/shaders/light-basic.vert");
+    static const string frg_shader_filename(GLMARK_DATA_PATH"/shaders/light-basic.frag");
+    static const vec4 materialDiffuse(1.0f, 1.0f, 1.0f, 1.0f);
+
+    ShaderSource vtx_source(vtx_shader_filename);
+    ShaderSource frg_source(frg_shader_filename);
+
+    vtx_source.add_const("LightSourcePosition", lightPosition);
+    vtx_source.add_const("MaterialDiffuse", materialDiffuse);
+
+    if (!Scene::load_shaders_from_strings(program_, vtx_source.str(), frg_source.str())) {
+        return false;
+    }
+
+    // Model setup
+    Model::find_models();
+    Model model;
+    bool modelLoaded = model.load("horse");
+
+    if(!modelLoaded) {
+        return false;
+    }
+
+    model.calculate_normals();
+
+    // Mesh setup
+    vector<std::pair<Model::AttribType, int> > attribs;
+    attribs.push_back(std::pair<Model::AttribType, int>(Model::AttribTypePosition, 3));
+    attribs.push_back(std::pair<Model::AttribType, int>(Model::AttribTypeNormal, 3));
+    model.convert_to_mesh(mesh_, attribs);
+
+    useVbo_ = (options["use-vbo"].value == "true");
+    bool interleave = (options["interleave"].value == "true");
+    mesh_.vbo_update_method(Mesh::VBOUpdateMethodMap);
+    mesh_.interleave(interleave);
+
+    if (useVbo_) {
+        mesh_.build_vbo();
+    }
+    else {
+        mesh_.build_array();
+    }
+
+    // Calculate a projection matrix that is a good fit for the model
+    vec3 maxVec = model.maxVec();
+    vec3 minVec = model.minVec();
+    vec3 diffVec = maxVec - minVec;
+    centerVec_ = maxVec + minVec;
+    centerVec_ /= 2.0;
+    float diameter = diffVec.length();
+    radius_ = diameter / 2;
+    float fovy = 2.0 * atanf(radius_ / (2.0 + radius_));
+    fovy /= M_PI;
+    fovy *= 180.0;
+    float aspect(static_cast<float>(canvas_.width())/static_cast<float>(canvas_.height()));
+    projection_.perspective(fovy, aspect, 2.0, 50.0);
+
+    if (!depthTarget_.setup(canvas_.width(), canvas_.height())) {
+        Log::error("Failed to set up the render target for the depth pass\n");
+        return false;
+    }
+
+    if (!ground_.setup(projection_.getCurrent(), depthTarget_.texture())) {
+        Log::error("Failed to set up the ground renderer\n");
+        return false;
+    }
+
+    return true;
+}
+
+
+void
+ShadowPrivate::teardown()
+{
+    depthTarget_.teardown();
+    ground_.teardown();
+    program_.stop();
+    program_.release();
+    mesh_.reset();
+}
+
+void
+ShadowPrivate::update(double elapsedTime)
+{
+    rotation_ = rotationSpeed_ * elapsedTime;
+}
+
+void
+ShadowPrivate::draw()
+{
+    // To perform the depth pass, set up the model-view transformation so
+    // that we're looking at the horse from the light position.  That will
+    // give us the appropriate view for the shadow.
+    modelview_.push();
+    modelview_.loadIdentity();
+    modelview_.lookAt(lightPosition.x(), lightPosition.y(), lightPosition.z(),
+                      0.0, 0.0, 0.0,
+                      0.0, 1.0, 0.0);
+    modelview_.rotate(rotation_, 0.0f, 1.0f, 0.0f);
+    mat4 mvp(projection_.getCurrent());
+    mvp *= modelview_.getCurrent();
+    modelview_.pop();
+
+    // Enable the depth render target with our transformation and render.
+    depthTarget_.enable(mvp);
+    vector<GLint> attrib_locations;
+    attrib_locations.push_back(depthTarget_.program()["position"].location());
+    attrib_locations.push_back(depthTarget_.program()["normal"].location());
+    mesh_.set_attrib_locations(attrib_locations);
+    if (useVbo_) {
+        mesh_.render_vbo();
+    }
+    else {
+        mesh_.render_array();
+    }
+    depthTarget_.disable();
+
+    // Ground rendering using the above generated texture...
+    ground_.draw();
+
+    // Draw the "normal" view of the horse
+    modelview_.push();
+    modelview_.translate(-centerVec_.x(), -centerVec_.y(), -(centerVec_.z() + 2.0 + radius_));
+    modelview_.rotate(rotation_, 0.0f, 1.0f, 0.0f);
+    mvp = projection_.getCurrent();
+    mvp *= modelview_.getCurrent();
+
+    program_.start();
+    program_["ModelViewProjectionMatrix"] = mvp;
+
+    // Load the NormalMatrix uniform in the shader. The NormalMatrix is the
+    // inverse transpose of the model view matrix.
+    LibMatrix::mat4 normal_matrix(modelview_.getCurrent());
+    normal_matrix.inverse().transpose();
+    program_["NormalMatrix"] = normal_matrix;
+    attrib_locations.clear();
+    attrib_locations.push_back(program_["position"].location());
+    attrib_locations.push_back(program_["normal"].location());
+    mesh_.set_attrib_locations(attrib_locations);
+    if (useVbo_) {
+        mesh_.render_vbo();
+    }
+    else {
+        mesh_.render_array();
+    }
+
+    // Per-frame cleanup
+    modelview_.pop();
+}
+
+SceneShadow::SceneShadow(Canvas& canvas) :
+    Scene(canvas, "shadow"),
+    priv_(0)
+{
+    options_["use-vbo"] = Scene::Option("use-vbo", "true",
+                                        "Whether to use VBOs for rendering",
+                                        "false,true");
+    options_["interleave"] = Scene::Option("interleave", "false",
+                                           "Whether to interleave vertex attribute data",
+                                           "false,true");
+}
+
+bool
+SceneShadow::supported(bool show_errors)
+{
+    static const string oes_depth_texture("GL_OES_depth_texture");
+    static const string arb_depth_texture("GL_ARB_depth_texture");
+    if (!GLExtensions::support(oes_depth_texture) &&
+        !GLExtensions::support(arb_depth_texture)) {
+        if (show_errors) {
+            Log::error("We do not have the depth texture extension!!!\n");
+        }
+
+        return false;
+    }
+    return true;
+}
+
+bool
+SceneShadow::load()
+{
+    running_ = false;
+    return true;
+}
+
+void
+SceneShadow::unload()
+{
+}
+
+bool
+SceneShadow::setup()
+{
+    // If the scene isn't supported, don't bother to go through setup.
+    if (!supported(false) || !Scene::setup())
+    {
+        return false;
+    }
+
+    priv_ = new ShadowPrivate(canvas_);
+    if (!priv_->setup(options_)) {
+        delete priv_;
+        priv_ = 0;
+        return false;
+    }
+
+    // Set core scene timing after actual initialization so we don't measure
+    // set up time.
+    startTime_ = Util::get_timestamp_us() / 1000000.0;
+    lastUpdateTime_ = startTime_;
+    running_ = true;
+
+    return true;
+}
+
+void
+SceneShadow::teardown()
+{
+    // Add scene-specific teardown here
+    priv_->teardown();
+    delete priv_;
+    Scene::teardown();
+}
+
+void
+SceneShadow::update()
+{
+    Scene::update();
+    // Add scene-specific update here
+    priv_->update(lastUpdateTime_ - startTime_);
+}
+
+void
+SceneShadow::draw()
+{
+    priv_->draw();
+}
+
+Scene::ValidationResult
+SceneShadow::validate()
+{
+    return Scene::ValidationUnknown;
+}
diff --git a/src/scene-terrain.cpp b/src/scene-terrain.cpp
new file mode 100644
index 0000000..bf8e18b
--- /dev/null
+++ b/src/scene-terrain.cpp
@@ -0,0 +1,362 @@
+/*
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis
+ */
+#include "scene.h"
+#include "mat.h"
+#include "stack.h"
+#include "vec.h"
+#include "log.h"
+#include "mesh.h"
+#include "util.h"
+#include "texture.h"
+#include "shader-source.h"
+#include "renderer.h"
+
+using LibMatrix::vec2;
+using LibMatrix::vec3;
+using LibMatrix::vec4;
+using LibMatrix::mat4;
+
+class SceneTerrainPrivate
+{
+public:
+    SceneTerrainPrivate(Canvas &canvas, const LibMatrix::vec2 &repeat_overlay,
+                        bool use_bloom, bool use_tilt_shift) :
+        canvas(canvas), repeat_overlay(repeat_overlay),
+        use_bloom(use_bloom), use_tilt_shift(use_tilt_shift),
+        terrain_renderer(0), bloom_v_renderer(0), bloom_h_renderer(0),
+        overlay_renderer(0), tilt_v_renderer(0), tilt_h_renderer(0),
+        copy_renderer(0), height_map_renderer(0), normal_map_renderer(0),
+        specular_map_renderer(0),
+        height_normal_chain(0), bloom_chain(0), tilt_chain(0), terrain_chain(0)
+    {
+        init_renderers();
+    }
+
+    ~SceneTerrainPrivate()
+    {
+        release_renderers();
+    }
+
+    void init_renderers()
+    {
+        /* Create and set up renderers */
+        const vec2 map_res(256.0f, 256.0f);
+        const vec2 screen_res(canvas.width(), canvas.height());
+        const vec2 bloom_res(256.0f, 256.0f);
+        const vec2 grass_res(512.0f, 512.0f);
+
+        height_map_renderer = new SimplexNoiseRenderer(map_res);
+        height_map_renderer->setup(height_map_renderer->size(), false, false);
+
+        normal_map_renderer = new NormalFromHeightRenderer(map_res);
+        normal_map_renderer->setup(normal_map_renderer->size(), false, false);
+
+        specular_map_renderer = new LuminanceRenderer(grass_res);
+        specular_map_renderer->setup_texture(GL_LINEAR_MIPMAP_LINEAR, GL_LINEAR,
+                                             GL_REPEAT, GL_REPEAT);
+        specular_map_renderer->setup(specular_map_renderer->size(), false, false);
+
+        terrain_renderer = new TerrainRenderer(screen_res, repeat_overlay);
+        terrain_renderer->setup(terrain_renderer->size(),
+                                !use_bloom && !use_tilt_shift,
+                                true);
+        terrain_renderer->setup_texture(GL_LINEAR_MIPMAP_LINEAR, GL_LINEAR,
+                                        GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE);
+
+        /* Bloom */
+        if (use_bloom) {
+            bloom_h_renderer = new BlurRenderer(bloom_res, 2, 4.0,
+                                                BlurRenderer::BlurDirectionHorizontal,
+                                                vec2(1.0, 1.0) / screen_res,
+                                                0.0);
+            bloom_h_renderer->setup_texture(GL_LINEAR_MIPMAP_LINEAR, GL_LINEAR,
+                                            GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE);
+            bloom_h_renderer->setup(bloom_h_renderer->size(), false, false);
+
+            bloom_v_renderer = new BlurRenderer(bloom_res, 2, 4.0,
+                                                BlurRenderer::BlurDirectionVertical,
+                                                vec2(1.0, 1.0) / bloom_res,
+                                                0.0);
+            bloom_v_renderer->setup_texture(GL_LINEAR_MIPMAP_LINEAR, GL_LINEAR,
+                                            GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE);
+            bloom_v_renderer->setup(bloom_v_renderer->size(), false, false);
+            overlay_renderer = new OverlayRenderer(*terrain_renderer, 0.6);
+        }
+
+        /* Tilt-shift */
+        if (use_tilt_shift) {
+            tilt_h_renderer = new BlurRenderer(screen_res, 4, 2.7,
+                                               BlurRenderer::BlurDirectionHorizontal,
+                                               vec2(1.0, 1.0) / screen_res,
+                                               0.5);
+            tilt_h_renderer->setup_texture(GL_LINEAR_MIPMAP_LINEAR, GL_LINEAR,
+                                           GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE);
+            tilt_h_renderer->setup(tilt_h_renderer->size(), false, false);
+
+            tilt_v_renderer = new BlurRenderer(screen_res, 4, 2.7,
+                                               BlurRenderer::BlurDirectionVertical,
+                                               vec2(1.0, 1.0) / screen_res,
+                                               0.5);
+        }
+
+        /* Copy renderer */
+        if (use_bloom && !use_tilt_shift)
+            copy_renderer = new CopyRenderer(screen_res);
+
+        /* Height normal chain */
+        height_normal_chain = new RendererChain();
+        height_normal_chain->append(*height_map_renderer);
+        height_normal_chain->append(*normal_map_renderer);
+
+        /* Bloom effect chain */
+        if (use_bloom) {
+            bloom_chain = new RendererChain();
+            bloom_chain->append(*bloom_h_renderer);
+            bloom_chain->append(*bloom_v_renderer);
+            bloom_chain->append(*overlay_renderer);
+        }
+
+        /* Tilt-shift effect chain */
+        if (use_tilt_shift) {
+            tilt_chain = new RendererChain();
+            tilt_chain->append(*tilt_h_renderer);
+            tilt_chain->append(*tilt_v_renderer);
+        }
+
+        /* Terrain chain */
+        terrain_chain = new RendererChain();
+        terrain_chain->append(*terrain_renderer);
+        if (use_bloom)
+            terrain_chain->append(*bloom_chain);
+        if (use_tilt_shift)
+            terrain_chain->append(*tilt_chain);
+
+        /*
+         * If are just using bloom, the terrain is rendered to a texture and
+         * bloom applied on that texture. We need to "copy" that texture's
+         * contents to the screen to make the scene visible.
+         */
+        if (use_bloom && !use_tilt_shift)
+            terrain_chain->append(*copy_renderer);
+
+        /*
+         * Set up renderer textures.
+         */
+        terrain_renderer->height_map_texture(height_map_renderer->texture());
+        terrain_renderer->normal_map_texture(normal_map_renderer->texture());
+        terrain_renderer->specular_map_texture(specular_map_renderer->texture());
+
+        specular_map_renderer->input_texture(terrain_renderer->diffuse1_texture());
+    }
+
+    void release_renderers()
+    {
+        delete terrain_chain;
+        delete bloom_chain;
+        delete tilt_chain;
+        delete height_normal_chain;
+
+        delete height_map_renderer;
+        delete normal_map_renderer;
+        delete specular_map_renderer;
+        delete terrain_renderer;
+        delete bloom_v_renderer;
+        delete bloom_h_renderer;
+        delete overlay_renderer;
+        delete tilt_v_renderer;
+        delete tilt_h_renderer;
+        delete copy_renderer;
+    }
+
+    Canvas &canvas;
+    LibMatrix::vec2 repeat_overlay;
+    bool use_bloom;
+    bool use_tilt_shift;
+
+    /* Renderers */
+    TerrainRenderer *terrain_renderer;
+    BlurRenderer *bloom_v_renderer;
+    BlurRenderer *bloom_h_renderer;
+    OverlayRenderer *overlay_renderer;
+    BlurRenderer *tilt_v_renderer;
+    BlurRenderer *tilt_h_renderer;
+    CopyRenderer *copy_renderer;
+
+    SimplexNoiseRenderer *height_map_renderer;
+    NormalFromHeightRenderer *normal_map_renderer;
+    LuminanceRenderer *specular_map_renderer;
+
+    /* Chains */
+    RendererChain *height_normal_chain;
+    RendererChain *bloom_chain;
+    RendererChain *tilt_chain;
+    RendererChain *terrain_chain;
+};
+
+SceneTerrain::SceneTerrain(Canvas &pCanvas) :
+    Scene(pCanvas, "terrain"), priv_(0)
+{
+    options_["repeat-overlay"] = Scene::Option("repeat-overlay", "6.0",
+            "How many times to repeat the terrain texture on the terrain plane (per side)");
+    options_["bloom"] = Scene::Option("bloom", "true",
+                                      "Use bloom post-processing effect",
+                                      "false,true");
+    options_["tilt-shift"] = Scene::Option("tilt-shift", "true",
+                                           "Use tilt-shift post-processing effect",
+                                           "false,true");
+}
+
+SceneTerrain::~SceneTerrain()
+{
+    delete priv_;
+}
+
+bool
+SceneTerrain::supported(bool show_errors)
+{
+    GLint vertex_textures;
+    glGetIntegerv(GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS, &vertex_textures);
+
+    if (show_errors && vertex_textures <= 0) {
+        Log::error("SceneTerrain requires Vertex Texture Fetch support, "
+                   "but GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS is %d\n",
+                   vertex_textures);
+    }
+    
+    return vertex_textures > 0;
+}
+
+bool
+SceneTerrain::load()
+{
+    Scene::load();
+
+    running_ = false;
+
+    return true;
+}
+
+void
+SceneTerrain::unload()
+{
+    Scene::unload();
+}
+
+bool
+SceneTerrain::setup()
+{
+    if (!Scene::setup())
+        return false;
+
+    /* Parse options */
+    float repeat = Util::fromString<double>(options_["repeat-overlay"].value);
+    LibMatrix::vec2 repeat_overlay(repeat, repeat);
+    bool use_bloom = options_["bloom"].value == "true";
+    bool use_tilt_shift = options_["tilt-shift"].value == "true";
+
+    priv_ = new SceneTerrainPrivate(canvas_, repeat_overlay,
+                                    use_bloom, use_tilt_shift);
+
+    /* Set up terrain rendering program */
+    LibMatrix::Stack4 model;
+    LibMatrix::Stack4 camera;
+    LibMatrix::mat4 projection = LibMatrix::Mat4::perspective(
+            40.0, canvas_.width() / static_cast<float>(canvas_.height()),
+            2.0, 4000.0);
+
+    /* Place camera */
+    camera.lookAt(-1200.0f, 800.0f, 1200.0f,
+                  0.0, 0.0, 0.0,
+                  0.0, 1.0, 0.0);
+    
+    /* Move and rotate plane */
+    model.translate(0.0f, -125.0f, 0.0f);
+    model.rotate(-90.0, 1.0f, 0.0f, 0.0f);
+
+    LibMatrix::mat4 view_matrix(camera.getCurrent());
+    LibMatrix::mat4 model_matrix(model.getCurrent());
+
+    LibMatrix::mat4 model_view_matrix(view_matrix * model_matrix);
+
+    LibMatrix::mat4 normal_matrix(model_view_matrix);
+    normal_matrix.inverse().transpose();
+
+    /* Set up terrain renderer program */
+    priv_->terrain_renderer->program().start();
+    priv_->terrain_renderer->program()["viewMatrix"] = view_matrix;
+    priv_->terrain_renderer->program()["modelViewMatrix"] = model_view_matrix;
+    priv_->terrain_renderer->program()["normalMatrix"] = normal_matrix;
+    priv_->terrain_renderer->program()["projectionMatrix"] = projection;
+
+    /* Create the specular map */
+    priv_->specular_map_renderer->render();
+
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+    glViewport(0, 0, canvas_.width(), canvas_.height());
+
+    currentFrame_ = 0;
+    startTime_ = Util::get_timestamp_us() / 1000000.0;
+    running_ = true;
+
+    return true;
+}
+
+void
+SceneTerrain::teardown()
+{
+    delete priv_;
+    priv_ = 0;
+    Scene::teardown();
+}
+
+void
+SceneTerrain::update()
+{
+    Scene::update();
+
+    double now = Util::get_timestamp_us() / 1000000.0;
+    float diff = now - startTime_;
+    float scale = priv_->terrain_renderer->repeat_overlay().x() /
+                  priv_->height_map_renderer->uv_scale().x();
+
+    /* Update height map */
+    priv_->height_map_renderer->program().start();
+    priv_->height_map_renderer->program()["uvOffset"] = vec2(diff * 0.05f, 0.0f);
+    priv_->terrain_renderer->program().start();
+    priv_->terrain_renderer->program()["uOffset"] = vec2(scale * diff * 0.05f, 0.0f);
+}
+
+void
+SceneTerrain::draw()
+{
+    /* Render the height and normal maps used by the terrain */
+    priv_->height_normal_chain->render();
+
+    /* Render the terrain plus any post-processing effects */
+    priv_->terrain_chain->render();
+}
+
+Scene::ValidationResult
+SceneTerrain::validate()
+{
+    return Scene::ValidationUnknown;
+}
diff --git a/src/scene-terrain/base-renderer.cpp b/src/scene-terrain/base-renderer.cpp
new file mode 100644
index 0000000..b00c3d5
--- /dev/null
+++ b/src/scene-terrain/base-renderer.cpp
@@ -0,0 +1,144 @@
+/*
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis
+ */
+#include "renderer.h"
+
+BaseRenderer::BaseRenderer(const LibMatrix::vec2 &size) :
+    texture_(0), input_texture_(0), fbo_(0), depth_renderbuffer_(0),
+    min_filter_(GL_LINEAR), mag_filter_(GL_LINEAR),
+    wrap_s_(GL_CLAMP_TO_EDGE), wrap_t_(GL_CLAMP_TO_EDGE)
+{
+    setup(size, true, true);
+}
+
+BaseRenderer::~BaseRenderer()
+{
+    glDeleteTextures(1, &texture_);
+    glDeleteRenderbuffers(1, &depth_renderbuffer_);
+    glDeleteFramebuffers(1, &fbo_);
+}
+
+void
+BaseRenderer::setup(const LibMatrix::vec2 &size, bool onscreen, bool has_depth)
+{
+    size_ = size;
+    recreate(onscreen, has_depth);
+}
+
+void
+BaseRenderer::setup_texture(GLint min_filter, GLint mag_filter,
+                            GLint wrap_s, GLint wrap_t)
+{
+    min_filter_ = min_filter;
+    mag_filter_ = mag_filter;
+    wrap_s_ = wrap_s;
+    wrap_t_ = wrap_t;
+    update_texture_parameters();
+}
+
+void
+BaseRenderer::make_current()
+{
+    glBindFramebuffer(GL_FRAMEBUFFER, fbo_);
+    glViewport(0, 0, size_.x(), size_.y());
+    if (!fbo_ || depth_renderbuffer_) {
+        glEnable(GL_DEPTH_TEST);
+        glDepthMask(GL_TRUE);
+    }
+    else {
+        glDisable(GL_DEPTH_TEST);
+        glDepthMask(GL_FALSE);
+    }
+}
+
+void
+BaseRenderer::update_mipmap()
+{
+    if (texture_ && min_filter_ != GL_NEAREST && min_filter_ != GL_LINEAR) {
+        glBindTexture(GL_TEXTURE_2D, texture_);
+        glGenerateMipmap(GL_TEXTURE_2D);
+    }
+}
+
+void
+BaseRenderer::recreate(bool onscreen, bool has_depth)
+{
+    if (texture_) {
+        glDeleteTextures(1, &texture_);
+        texture_ = 0;
+    }
+    if (fbo_) {
+        glDeleteRenderbuffers(1, &depth_renderbuffer_);
+        depth_renderbuffer_ = 0;
+        glDeleteFramebuffers(1, &fbo_);
+        fbo_ = 0;
+    }
+    if (!onscreen) {
+        create_texture();
+        create_fbo(has_depth);
+    }
+}
+
+void
+BaseRenderer::create_texture()
+{
+    glGenTextures(1, &texture_);
+    glBindTexture(GL_TEXTURE_2D, texture_);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, size_.x(), size_.y(), 0,
+            GL_RGBA, GL_UNSIGNED_BYTE, 0);
+    update_texture_parameters();
+}
+
+void
+BaseRenderer::update_texture_parameters()
+{
+    if (texture_) {
+        glBindTexture(GL_TEXTURE_2D, texture_);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, min_filter_);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, mag_filter_);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, wrap_s_);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, wrap_t_);
+    }
+    update_mipmap();
+}
+
+void
+BaseRenderer::create_fbo(bool has_depth)
+{
+    if (has_depth) {
+        /* Create a renderbuffer for depth storage */
+        glGenRenderbuffers(1, &depth_renderbuffer_);
+        glBindRenderbuffer(GL_RENDERBUFFER, depth_renderbuffer_);
+        glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16,
+                size_.x(), size_.y());
+    }
+
+    /* Create the FBO and attach the texture and the renderebuffer */
+    glGenFramebuffers(1, &fbo_);
+    glBindFramebuffer(GL_FRAMEBUFFER, fbo_);
+    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+            GL_TEXTURE_2D, texture_, 0);
+    if (has_depth) {
+        glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
+                GL_RENDERBUFFER, depth_renderbuffer_);
+    }
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+}
diff --git a/src/scene-terrain/blur-renderer.cpp b/src/scene-terrain/blur-renderer.cpp
new file mode 100644
index 0000000..65fb441
--- /dev/null
+++ b/src/scene-terrain/blur-renderer.cpp
@@ -0,0 +1,161 @@
+/*
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis
+ */
+#include "scene.h"
+#include "renderer.h"
+#include "shader-source.h"
+
+void
+create_blur_shaders(ShaderSource& vtx_source, ShaderSource& frg_source,
+                    unsigned int radius, float sigma, BlurRenderer::BlurDirection direction,
+                    float tilt_shift);
+
+BlurRenderer::BlurRenderer(const LibMatrix::vec2 &size, int radius, float sigma,
+                           BlurDirection dir, const LibMatrix::vec2 &step, float tilt_shift) :
+        TextureRenderer(size, *blur_program(true, radius, sigma, dir, step, tilt_shift))
+{
+    blur_program_ = blur_program(false, radius, sigma, dir, step, tilt_shift);
+}
+
+Program *
+BlurRenderer::blur_program(bool create_new, int radius, float sigma,
+                           BlurDirection dir, const LibMatrix::vec2 &step,
+                           float tilt_shift)
+{
+    static Program *blur_program(0);
+    if (create_new)
+        blur_program = 0;
+
+    if (!blur_program) {
+        blur_program = new Program();
+        ShaderSource blur_vtx_shader;
+        ShaderSource blur_frg_shader;
+        create_blur_shaders(blur_vtx_shader, blur_frg_shader, radius,
+                            sigma, dir, tilt_shift);
+
+        if (dir == BlurDirectionHorizontal || dir == BlurDirectionBoth)
+            blur_frg_shader.add_const("TextureStepX", step.x());
+        if (dir == BlurDirectionVertical || dir == BlurDirectionBoth)
+            blur_frg_shader.add_const("TextureStepY", step.y());
+
+        Scene::load_shaders_from_strings(*blur_program,
+                blur_vtx_shader.str(),
+                blur_frg_shader.str());
+        blur_program->start();
+        (*blur_program)["Texture0"] = 0;
+        (*blur_program)["uvOffset"] = LibMatrix::vec2(0.0f, 0.0f);
+        (*blur_program)["uvScale"] = LibMatrix::vec2(1.0f, 1.0f);
+        blur_program->stop();
+    }
+
+    return blur_program;
+}
+
+void
+create_blur_shaders(ShaderSource& vtx_source, ShaderSource& frg_source,
+                    unsigned int radius, float sigma, BlurRenderer::BlurDirection direction,
+                    float tilt_shift)
+{
+    vtx_source.append_file(GLMARK_DATA_PATH"/shaders/terrain-texture.vert");
+    frg_source.append_file(GLMARK_DATA_PATH"/shaders/terrain-blur.frag");
+
+    /* Don't let the gaussian curve become too narrow */
+    if (sigma < 1.0)
+        sigma = 1.0;
+
+    unsigned int side = 2 * radius + 1;
+    float values[radius];
+    float sum = 0.0;
+
+    for (unsigned int i = 0; i < radius + 1; i++) {
+        float s2 = 2.0 * sigma * sigma;
+        float k = 1.0 / std::sqrt(M_PI * s2) * std::exp( - (static_cast<float>(i) * i) / s2);
+        values[i] = k;
+        sum += k;
+    }
+
+    sum += sum - values[0];
+
+    for (unsigned int i = 0; i < radius + 1; i++) {
+        std::stringstream ss_tmp;
+        ss_tmp << "Kernel" << i;
+        frg_source.add_const(ss_tmp.str(), values[i] / sum);
+    }
+
+    frg_source.add_const("TiltShift", tilt_shift);
+
+    std::stringstream ss;
+
+    if (direction == BlurRenderer::BlurDirectionHorizontal ||
+        direction == BlurRenderer::BlurDirectionBoth)
+    {
+        if (tilt_shift == 1.0)
+            ss << "const float stepX = TextureStepX;" << std::endl;
+        else
+            ss << "float stepX = TextureStepX * abs(TiltShift - TextureCoord.y) / abs(1.0 - TiltShift);" << std::endl;
+    }
+
+    if (direction == BlurRenderer::BlurDirectionVertical ||
+        direction == BlurRenderer::BlurDirectionBoth)
+    {
+        if (tilt_shift == 1.0)
+            ss << "const float stepY = TextureStepY;" << std::endl;
+        else
+            ss << "float stepY = TextureStepY * abs(TiltShift - TextureCoord.y) / abs(1.0 - TiltShift);" << std::endl;
+    }
+
+    ss << "result = " << std::endl;
+
+    if (direction == BlurRenderer::BlurDirectionHorizontal) {
+        for (unsigned int i = 0; i < side; i++) {
+            int offset = static_cast<int>(i - radius);
+            ss << "texture2D(Texture0, TextureCoord + vec2(" <<
+                  offset << ".0 * stepX, 0.0)) * Kernel" <<
+                  std::abs(offset) << " +" << std::endl;
+        }
+        ss << "0.0 ;" << std::endl;
+    }
+    else if (direction == BlurRenderer::BlurDirectionVertical) {
+        for (unsigned int i = 0; i < side; i++) {
+            int offset = static_cast<int>(i - radius);
+            ss << "texture2D(Texture0, TextureCoord + vec2(0.0, " <<
+                  offset << ".0 * stepY)) * Kernel" <<
+                  std::abs(offset) << " +" << std::endl;
+        }
+        ss << "0.0 ;" << std::endl;
+    }
+    else if (direction == BlurRenderer::BlurDirectionBoth) {
+        for (unsigned int i = 0; i < side; i++) {
+            int ioffset = static_cast<int>(i - radius);
+            for (unsigned int j = 0; j < side; j++) {
+                int joffset = static_cast<int>(j - radius);
+                ss << "texture2D(Texture0, TextureCoord + vec2(" <<
+                      ioffset << ".0 * stepX, " <<
+                      joffset << ".0 * stepY))" <<
+                      " * Kernel" << std::abs(ioffset) <<
+                      " * Kernel" << std::abs(joffset) << " +" << std::endl;
+            }
+        }
+        ss << " 0.0;" << std::endl;
+    }
+
+    frg_source.replace("$CONVOLUTION$", ss.str());
+}
diff --git a/src/scene-terrain/copy-renderer.cpp b/src/scene-terrain/copy-renderer.cpp
new file mode 100644
index 0000000..1c91e66
--- /dev/null
+++ b/src/scene-terrain/copy-renderer.cpp
@@ -0,0 +1,55 @@
+/*
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis
+ */
+#include "scene.h"
+#include "renderer.h"
+#include "shader-source.h"
+
+CopyRenderer::CopyRenderer(const LibMatrix::vec2 &size) :
+    TextureRenderer(size, *copy_program(true))
+{
+    copy_program_ = copy_program(false);
+}
+
+Program *
+CopyRenderer::copy_program(bool create_new)
+{
+    static Program *copy_program(0);
+    if (create_new)
+        copy_program = 0;
+
+    if (!copy_program) {
+        copy_program = new Program();
+        ShaderSource vtx_shader(GLMARK_DATA_PATH"/shaders/terrain-texture.vert");
+        ShaderSource frg_shader(GLMARK_DATA_PATH"/shaders/terrain-overlay.frag");
+
+        Scene::load_shaders_from_strings(*copy_program, vtx_shader.str(), frg_shader.str());
+
+        copy_program->start();
+        (*copy_program)["tDiffuse"] = 0;
+        (*copy_program)["opacity"] = 1.0f;
+        (*copy_program)["uvOffset"] = LibMatrix::vec2(0.0f, 0.0f);
+        (*copy_program)["uvScale"] = LibMatrix::vec2(1.0f, 1.0f);
+        copy_program->stop();
+    }
+
+    return copy_program;
+}
diff --git a/src/scene-terrain/luminance-renderer.cpp b/src/scene-terrain/luminance-renderer.cpp
new file mode 100644
index 0000000..2a88417
--- /dev/null
+++ b/src/scene-terrain/luminance-renderer.cpp
@@ -0,0 +1,57 @@
+/*
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis
+ */
+#include "scene.h"
+#include "renderer.h"
+#include "shader-source.h"
+
+LuminanceRenderer::LuminanceRenderer(const LibMatrix::vec2 &size) :
+    TextureRenderer(size, *luminance_program(true))
+{
+    luminance_program_ = luminance_program(false);
+}
+
+Program *
+LuminanceRenderer::luminance_program(bool create_new)
+{
+    static Program *luminance_program(0);
+    if (create_new)
+        luminance_program = 0;
+
+    if (!luminance_program) {
+        luminance_program = new Program();
+        ShaderSource vtx_shader(GLMARK_DATA_PATH"/shaders/terrain-texture.vert");
+        ShaderSource frg_shader(GLMARK_DATA_PATH"/shaders/terrain-luminance.frag");
+
+        Scene::load_shaders_from_strings(*luminance_program,
+                                         vtx_shader.str(), frg_shader.str());
+
+        luminance_program->start();
+        (*luminance_program)["tDiffuse"] = 0;
+        (*luminance_program)["uvOffset"] = LibMatrix::vec2(0.0f, 0.0f);
+        (*luminance_program)["uvScale"] = LibMatrix::vec2(1.0f, 1.0f);
+        luminance_program->stop();
+    }
+
+    return luminance_program;
+}
+
+
diff --git a/src/scene-terrain/normal-from-height-renderer.cpp b/src/scene-terrain/normal-from-height-renderer.cpp
new file mode 100644
index 0000000..7a264c6
--- /dev/null
+++ b/src/scene-terrain/normal-from-height-renderer.cpp
@@ -0,0 +1,59 @@
+/*
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis
+ */
+#include "scene.h"
+#include "renderer.h"
+#include "shader-source.h"
+
+NormalFromHeightRenderer::NormalFromHeightRenderer(const LibMatrix::vec2 &size) :
+    TextureRenderer(size, *normal_from_height_program(size, true))
+{
+    normal_from_height_program_ = normal_from_height_program(size, false);
+}
+
+Program *
+NormalFromHeightRenderer::normal_from_height_program(const LibMatrix::vec2 &size,
+                                                     bool create_new)
+{
+    static Program *normal_from_height_program(0);
+    if (create_new)
+        normal_from_height_program = 0;
+
+    if (!normal_from_height_program) {
+        normal_from_height_program = new Program();
+        ShaderSource vtx_shader(GLMARK_DATA_PATH"/shaders/terrain-texture.vert");
+        ShaderSource frg_shader(GLMARK_DATA_PATH"/shaders/terrain-normalmap.frag");
+
+        Scene::load_shaders_from_strings(*normal_from_height_program,
+                                         vtx_shader.str(), frg_shader.str());
+
+        normal_from_height_program->start();
+        (*normal_from_height_program)["heightMap"] = 0;
+        (*normal_from_height_program)["resolution"] = size;
+        (*normal_from_height_program)["height"] = 0.05f;
+        (*normal_from_height_program)["uvOffset"] = LibMatrix::vec2(0.0f, 0.0f);
+        (*normal_from_height_program)["uvScale"] = LibMatrix::vec2(1.0f, 1.0f);
+        normal_from_height_program->stop();
+    }
+
+    return normal_from_height_program;
+}
+
diff --git a/src/scene-terrain/overlay-renderer.cpp b/src/scene-terrain/overlay-renderer.cpp
new file mode 100644
index 0000000..8fea325
--- /dev/null
+++ b/src/scene-terrain/overlay-renderer.cpp
@@ -0,0 +1,122 @@
+/*
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis
+ */
+#include "scene.h"
+#include "renderer.h"
+#include "shader-source.h"
+
+OverlayRenderer::OverlayRenderer(IRenderer &target, GLfloat opacity) :
+    target_renderer_(target), opacity_(opacity)
+
+{
+    create_program();
+    create_mesh();
+}
+
+
+void
+OverlayRenderer::setup(const LibMatrix::vec2 &size, bool onscreen, bool has_depth)
+{
+    static_cast<void>(size);
+    static_cast<void>(onscreen);
+    static_cast<void>(has_depth);
+}
+
+void
+OverlayRenderer::setup_texture(GLint min_filter, GLint mag_filter,
+                               GLint wrap_s, GLint wrap_t)
+{
+    static_cast<void>(min_filter);
+    static_cast<void>(mag_filter);
+    static_cast<void>(wrap_s);
+    static_cast<void>(wrap_t);
+}
+
+void
+OverlayRenderer::make_current()
+{
+    target_renderer_.make_current();
+}
+
+void
+OverlayRenderer::update_mipmap()
+{
+    target_renderer_.update_mipmap();
+}
+
+void
+OverlayRenderer::render()
+{
+    target_renderer_.make_current();
+
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, input_texture_);
+
+    glEnable(GL_BLEND);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE);
+    program_.start();
+
+    mesh_.render_vbo();
+
+    program_.stop();
+
+    glDisable(GL_BLEND);
+
+    target_renderer_.update_mipmap();
+}
+
+void
+OverlayRenderer::create_mesh()
+{
+    // Set vertex format
+    std::vector<int> vertex_format;
+    vertex_format.push_back(3); // Position
+    mesh_.set_vertex_format(vertex_format);
+
+    mesh_.make_grid(1, 1, 2.0, 2.0, 0);
+    mesh_.build_vbo();
+
+    program_.start();
+
+    // Set attribute locations
+    std::vector<GLint> attrib_locations;
+    attrib_locations.push_back(program_["position"].location());
+    mesh_.set_attrib_locations(attrib_locations);
+
+    program_.stop();
+}
+
+void
+OverlayRenderer::create_program()
+{
+    ShaderSource vtx_shader(GLMARK_DATA_PATH"/shaders/terrain-texture.vert");
+    ShaderSource frg_shader(GLMARK_DATA_PATH"/shaders/terrain-overlay.frag");
+
+    if (!Scene::load_shaders_from_strings(program_, vtx_shader.str(), frg_shader.str()))
+        return;
+
+    program_.start();
+    program_["tDiffuse"] = 0;
+    program_["opacity"] = opacity_;
+    program_["uvOffset"] = LibMatrix::vec2(0.0f, 0.0f);
+    program_["uvScale"] = LibMatrix::vec2(1.0f, 1.0f);
+    program_.stop();
+}
diff --git a/src/scene-terrain/renderer-chain.cpp b/src/scene-terrain/renderer-chain.cpp
new file mode 100644
index 0000000..54057e4
--- /dev/null
+++ b/src/scene-terrain/renderer-chain.cpp
@@ -0,0 +1,115 @@
+/*
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis
+ */
+#include "renderer.h"
+
+void
+RendererChain::setup(const LibMatrix::vec2 &size, bool onscreen, bool has_depth)
+{
+    static_cast<void>(size);
+    static_cast<void>(onscreen);
+    static_cast<void>(has_depth);
+}
+
+void
+RendererChain::setup_texture(GLint min_filter, GLint mag_filter,
+                             GLint wrap_s, GLint wrap_t)
+{
+    static_cast<void>(min_filter);
+    static_cast<void>(mag_filter);
+    static_cast<void>(wrap_s);
+    static_cast<void>(wrap_t);
+}
+
+void
+RendererChain::input_texture(GLuint t)
+{ 
+    if (!renderers_.empty()) {
+        IRenderer &renderer(*renderers_.front());
+        renderer.input_texture(t);
+    }
+}
+
+GLuint
+RendererChain::texture()
+{
+    GLuint t(0);
+
+    if (!renderers_.empty()) {
+        IRenderer &renderer(*renderers_.back());
+        t = renderer.texture();
+    }
+
+    return t;
+}
+
+LibMatrix::vec2
+RendererChain::size()
+{
+    LibMatrix::vec2 s;
+
+    if (!renderers_.empty()) {
+        IRenderer &renderer(*renderers_.back());
+        s = renderer.size();
+    }
+
+    return s;
+}
+
+void
+RendererChain::make_current()
+{
+    if (!renderers_.empty()) {
+        IRenderer &renderer(*renderers_.back());
+        renderer.make_current();
+    }
+}
+
+void
+RendererChain::update_mipmap()
+{
+    if (!renderers_.empty()) {
+        IRenderer &renderer(*renderers_.back());
+        renderer.update_mipmap();
+    }
+}
+
+void
+RendererChain::render()
+{
+    for(std::vector<IRenderer *>::iterator iter = renderers_.begin();
+        iter != renderers_.end();
+        iter++)
+    {
+        (*iter)->render();
+    }
+}
+
+void
+RendererChain::append(IRenderer &renderer)
+{
+    if (!renderers_.empty()) {
+        IRenderer &prev_renderer(*renderers_.back());
+        renderer.input_texture(prev_renderer.texture());
+    }
+
+    renderers_.push_back(&renderer);
+}
diff --git a/src/scene-terrain/renderer.h b/src/scene-terrain/renderer.h
new file mode 100644
index 0000000..5f2bfa0
--- /dev/null
+++ b/src/scene-terrain/renderer.h
@@ -0,0 +1,348 @@
+/*
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis
+ */
+#include <stdint.h>
+#include <vector>
+
+#include "mesh.h"
+#include "vec.h"
+#include "program.h"
+#include "gl-headers.h"
+
+/** 
+ * Renderer interface.
+ */
+class IRenderer
+{
+public:
+    /** 
+     * Sets up the renderer's target.
+     */
+    virtual void setup(const LibMatrix::vec2 &size, bool onscreen, bool has_depth) = 0;
+    /** 
+     * Sets up the renderer's target texture (if any).
+     */
+    virtual void setup_texture(GLint min_filter, GLint mag_filter,
+                               GLint wrap_s, GLint wrap_t) = 0;
+    /** 
+     * Sets the renderer's input texture.
+     */
+    virtual void input_texture(GLuint t) = 0;
+    /** 
+     * Gets the renderer's target texture (if any).
+     */
+    virtual GLuint texture() = 0;
+    /** 
+     * Gets the size of the renderer's target.
+     */
+    virtual LibMatrix::vec2 size() = 0;
+    /** 
+     * Makes the renderer current i.e. the rendering target.
+     */
+    virtual void make_current() = 0;
+    /** 
+     * Updates the mipmap of the texture backing the renderer (if any).
+     */
+    virtual void update_mipmap() = 0;
+    /** 
+     * Renders to the renderer's target.
+     */
+    virtual void render() = 0;
+
+protected:
+    virtual ~IRenderer() {}
+};
+
+/** 
+ * A chain of renderers, which implements IRenderer
+ */
+class RendererChain : public IRenderer
+{
+public:
+    RendererChain() {}
+    virtual ~RendererChain() {}
+
+    /* IRenderer methods */
+    void setup(const LibMatrix::vec2 &size, bool onscreen, bool has_depth);
+    void setup_texture(GLint min_filter, GLint mag_filter,
+                       GLint wrap_s, GLint wrap_t);
+    void input_texture(GLuint t);
+    GLuint texture();
+    LibMatrix::vec2 size();
+    void make_current();
+    void update_mipmap();
+    void render();
+
+    /** 
+     * Appends a renderer to the chain.
+     * 
+     * @param renderer the renderer to append
+     */
+    void append(IRenderer &renderer);
+
+private:
+    std::vector<IRenderer *> renderers_;
+};
+
+/** 
+ * A base implementation of the IRenderer interface.
+ */
+class BaseRenderer : public IRenderer
+{
+public:
+    BaseRenderer(const LibMatrix::vec2 &size);
+    virtual ~BaseRenderer();
+
+    /* IRenderer methods */
+    virtual void setup(const LibMatrix::vec2 &size, bool onscreen, bool has_depth);
+    virtual void setup_texture(GLint min_filter, GLint mag_filter,
+                               GLint wrap_s, GLint wrap_t);
+    virtual void input_texture(GLuint t) { input_texture_ = t; }
+    virtual GLuint texture() { return texture_; }
+    virtual LibMatrix::vec2 size() { return size_; }
+    virtual void make_current();
+    virtual void update_mipmap();
+    virtual void render() = 0;
+
+protected:
+    void recreate(bool onscreen, bool has_depth);
+    void create_texture();
+    void update_texture_parameters();
+    void create_fbo(bool has_depth);
+
+    LibMatrix::vec2 size_;
+    GLuint texture_;
+    GLuint input_texture_;
+    GLuint fbo_;
+    GLuint depth_renderbuffer_;
+    GLint min_filter_;
+    GLint mag_filter_;
+    GLint wrap_s_;
+    GLint wrap_t_;
+};
+
+/** 
+ * A renderer that renders its input texture to its target,
+ * according to the supplied GL Program.
+ */
+class TextureRenderer : public BaseRenderer
+{
+public:
+    TextureRenderer(const LibMatrix::vec2 &size, Program &program);
+    virtual ~TextureRenderer() { }
+
+    /* IRenderer/BaseRenderer methods */
+    virtual void render();
+
+    /**
+     * Gets the program associated with the renderer.
+     */
+    Program &program() { return program_; }
+
+private:
+    void create_mesh();
+
+    Mesh mesh_;
+    Program &program_;
+};
+
+/** 
+ * A renderer that copies the input texture to its target.
+ */
+class CopyRenderer : public TextureRenderer
+{
+public:
+    CopyRenderer(const LibMatrix::vec2 &size);
+
+    virtual ~CopyRenderer() { delete copy_program_; }
+
+private:
+    static Program *copy_program(bool create_new);
+
+    Program *copy_program_;
+};
+
+/** 
+ * A renderer that renders simplex noise to its target.
+ */
+class SimplexNoiseRenderer : public TextureRenderer
+{
+public:
+    SimplexNoiseRenderer(const LibMatrix::vec2 &size);
+    virtual ~SimplexNoiseRenderer() { delete noise_program_; }
+
+    LibMatrix::vec2 uv_scale() { return uv_scale_; }
+private:
+    static Program *noise_program(bool create_new);
+    static LibMatrix::vec2 uv_scale_;
+
+    Program *noise_program_;
+};
+
+/** 
+ * A renderer that renders a normal map to its target from a
+ * height map in its input texture.
+ */
+class NormalFromHeightRenderer : public TextureRenderer
+{
+public:
+    NormalFromHeightRenderer(const LibMatrix::vec2 &size);
+    virtual ~NormalFromHeightRenderer() { delete normal_from_height_program_; }
+
+private:
+    static Program *normal_from_height_program(const LibMatrix::vec2 &size, 
+                                               bool create_new);
+
+    Program *normal_from_height_program_;
+};
+
+/** 
+ * A renderer that renders the luminance of its input texture to its target.
+ */
+class LuminanceRenderer : public TextureRenderer
+{
+public:
+    LuminanceRenderer(const LibMatrix::vec2 &size);
+    virtual ~LuminanceRenderer() { delete luminance_program_; }
+
+private:
+    static Program *luminance_program(bool create_new);
+
+    Program *luminance_program_;
+};
+
+
+/** 
+ * A renderer that renders a blurred version of the input texture to its target.
+ */
+class BlurRenderer : public TextureRenderer
+{
+public:
+    enum BlurDirection {
+        BlurDirectionHorizontal,
+        BlurDirectionVertical,
+        BlurDirectionBoth
+    };
+
+    BlurRenderer(const LibMatrix::vec2 &size, int radius, float sigma,
+                 BlurDirection dir, const LibMatrix::vec2 &step, float tilt_shift);
+    virtual ~BlurRenderer() { delete blur_program_; }
+
+private:
+    static Program *blur_program(bool create_new, int radius, float sigma,
+                                 BlurDirection dir, const LibMatrix::vec2 &step,
+                                 float tilt_shift);
+
+    Program *blur_program_;
+};
+
+/** 
+ * A renderer that renders with opacity (overlays) it's input texture over
+ * the target of another renderer.
+ */
+class OverlayRenderer : public IRenderer
+{
+public:
+    OverlayRenderer(IRenderer &target, GLfloat opacity);
+    virtual ~OverlayRenderer() { }
+
+    /* IRenderable Methods */
+    void setup(const LibMatrix::vec2 &size, bool onscreen, bool has_depth);
+    void setup_texture(GLint min_filter, GLint mag_filter,
+                       GLint wrap_s, GLint wrap_t);
+    void input_texture(GLuint t) { input_texture_ = t; }
+    virtual GLuint texture() { return target_renderer_.texture(); }
+    virtual LibMatrix::vec2 size() { return target_renderer_.size(); }
+    virtual void render();
+    void make_current();
+    void update_mipmap();
+
+private:
+    void create_mesh();
+    void create_program();
+
+    Mesh mesh_;
+    Program program_;
+    IRenderer &target_renderer_;
+    GLfloat opacity_;
+    GLuint input_texture_;
+};
+
+/** 
+ * A renderer that renders a dynamic terrain as per the WebGL
+ * dynamic terrain demo.
+ */
+class TerrainRenderer : public BaseRenderer
+{
+public:
+    TerrainRenderer(const LibMatrix::vec2 &size, const LibMatrix::vec2 &repeat_overlay);
+    virtual ~TerrainRenderer();
+
+    /* IRenderable Methods */
+    virtual void render();
+
+    /**
+     * Gets the program associated with the renderer.
+     */
+    Program &program() { return program_; }
+    /**
+     * Sets the height map texture to use.
+     */
+    void height_map_texture(GLuint tex) { height_map_tex_ = tex; }
+    /**
+     * Sets the normal map texture to use.
+     */
+    void normal_map_texture(GLuint tex) { normal_map_tex_ = tex; }
+    /**
+     * Sets the specular map texture to use.
+     */
+    void specular_map_texture(GLuint tex) { specular_map_tex_ = tex; }
+    /**
+     * Returns the main diffuse texture.
+     */
+    GLuint diffuse1_texture() { return diffuse1_tex_; }
+    LibMatrix::vec2 repeat_overlay() { return repeat_overlay_; }
+
+private:
+    void create_mesh();
+    void init_textures();
+    void init_program();
+    void bind_textures();
+    void deinit_textures();
+
+    LibMatrix::vec3 color_to_vec3(uint32_t c)
+    {
+        return LibMatrix::vec3(((c >> 0) & 0xff) / 255.0,
+                               ((c >> 8) & 0xff) / 255.0,
+                               ((c >> 16) & 0xff) / 255.0);
+    }
+
+    Mesh mesh_;
+    Program program_;
+
+    GLuint height_map_tex_;
+    GLuint normal_map_tex_;
+    GLuint specular_map_tex_;
+    GLuint diffuse1_tex_;
+    GLuint diffuse2_tex_;
+    GLuint detail_tex_;
+    LibMatrix::vec2 repeat_overlay_;
+};
diff --git a/src/scene-terrain/simplex-noise-renderer.cpp b/src/scene-terrain/simplex-noise-renderer.cpp
new file mode 100644
index 0000000..42cc816
--- /dev/null
+++ b/src/scene-terrain/simplex-noise-renderer.cpp
@@ -0,0 +1,56 @@
+/*
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis
+ */
+#include "scene.h"
+#include "renderer.h"
+#include "shader-source.h"
+
+LibMatrix::vec2 SimplexNoiseRenderer::uv_scale_(1.5f, 1.5);
+
+SimplexNoiseRenderer::SimplexNoiseRenderer(const LibMatrix::vec2 &size) :
+    TextureRenderer(size, *noise_program(true))
+{
+    noise_program_ = noise_program(false);
+}
+
+Program *
+SimplexNoiseRenderer::noise_program(bool create_new)
+{
+    static Program *noise_program(0);
+    if (create_new)
+        noise_program = 0;
+
+    if (!noise_program) {
+        noise_program = new Program();
+        ShaderSource vtx_shader(GLMARK_DATA_PATH"/shaders/terrain-texture.vert");
+        ShaderSource frg_shader(GLMARK_DATA_PATH"/shaders/terrain-noise.frag");
+
+        Scene::load_shaders_from_strings(*noise_program, vtx_shader.str(), frg_shader.str());
+
+        noise_program->start();
+        (*noise_program)["time"] = 1.0f;
+        (*noise_program)["uvOffset"] = LibMatrix::vec2(0.0f, 0.0f);
+        (*noise_program)["uvScale"] = uv_scale_;
+        noise_program->stop();
+    }
+
+    return noise_program;
+}
diff --git a/src/scene-terrain/terrain-renderer.cpp b/src/scene-terrain/terrain-renderer.cpp
new file mode 100644
index 0000000..536401a
--- /dev/null
+++ b/src/scene-terrain/terrain-renderer.cpp
@@ -0,0 +1,246 @@
+/*
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis
+ */
+#include "scene.h"
+#include "renderer.h"
+#include "texture.h"
+#include "shader-source.h"
+
+TerrainRenderer::TerrainRenderer(const LibMatrix::vec2 &size,
+                                 const LibMatrix::vec2 &repeat_overlay) :
+    BaseRenderer(size), height_map_tex_(0), normal_map_tex_(0),
+    specular_map_tex_(0), repeat_overlay_(repeat_overlay)
+{
+    create_mesh();
+    init_textures();
+    init_program();
+}
+
+TerrainRenderer::~TerrainRenderer()
+{
+    deinit_textures();
+}
+
+void
+TerrainRenderer::render()
+{
+    make_current();
+    glClearColor(0.825f, 0.7425f, 0.61875f, 1.0f);
+    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
+
+    program_.start();
+
+    bind_textures();
+    mesh_.render_vbo();
+
+    program_.stop();
+
+    update_mipmap();
+}
+
+void
+TerrainRenderer::init_textures()
+{
+    /* Create textures */
+    Texture::load("terrain-grasslight-512", &diffuse1_tex_,
+            GL_LINEAR_MIPMAP_LINEAR, GL_LINEAR, 0);
+    Texture::load("terrain-backgrounddetailed6", &diffuse2_tex_,
+            GL_LINEAR_MIPMAP_LINEAR, GL_LINEAR, 0);
+    Texture::load("terrain-grasslight-512-nm", &detail_tex_,
+            GL_LINEAR_MIPMAP_LINEAR, GL_LINEAR, 0);
+
+    /* Set REPEAT wrap mode */
+    glBindTexture(GL_TEXTURE_2D, diffuse1_tex_);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+
+    glBindTexture(GL_TEXTURE_2D, diffuse2_tex_);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+
+    glBindTexture(GL_TEXTURE_2D, detail_tex_);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+}
+
+
+void
+TerrainRenderer::init_program()
+{
+    ShaderSource vtx_shader(GLMARK_DATA_PATH"/shaders/terrain.vert");
+    ShaderSource frg_shader(GLMARK_DATA_PATH"/shaders/terrain.frag");
+
+    if (!Scene::load_shaders_from_strings(program_, vtx_shader.str(), frg_shader.str()))
+        return;
+
+    program_.start();
+    /* Fog */
+    program_["fogDensity"] = 0.00025f;
+    program_["fogNear"] = 1.0f;
+    program_["fogFar"] = 2000.0f;
+    program_["fogColor"] = LibMatrix::vec3(0.825, 0.7425, 0.61875);
+
+    /* Lights */
+    program_["ambientLightColor"] = color_to_vec3(0xffffff);
+
+    program_["pointLightColor[0]"] = color_to_vec3(0xffffff);
+    program_["pointLightPosition[0]"] = LibMatrix::vec3(0.0, 0.0, 0.0);
+    program_["pointLightDistance[0]"] = 0.0f;
+
+    /* Textures */
+    program_["tDiffuse1"] = 0;
+    program_["tDiffuse2"] = 1;
+    program_["tDetail"] = 2;
+    program_["tNormal"] = 3;
+    program_["tSpecular"] = 4;
+    program_["tDisplacement"] = 5;
+
+    program_["uNormalScale"] = 3.5f;
+
+    program_["uDisplacementBias"] = 0.0f;
+    program_["uDisplacementScale"] = 375.0f;
+
+    program_["uDiffuseColor"] = color_to_vec3(0xffffff);
+    program_["uSpecularColor"] = color_to_vec3(0xffffff);
+    program_["uAmbientColor"] = color_to_vec3(0x888888);
+    program_["uShininess"] = 30.0f;
+    program_["uOpacity"] = 1.0f;
+
+    program_["uRepeatOverlay"] = repeat_overlay_;
+
+    program_["uOffset"] = LibMatrix::vec2(0.0, 0.0);
+
+    std::vector<GLint> attrib_locations;
+    attrib_locations.push_back(program_["position"].location());
+    attrib_locations.push_back(program_["normal"].location());
+    attrib_locations.push_back(program_["tangent"].location());
+    attrib_locations.push_back(program_["uv"].location());
+    mesh_.set_attrib_locations(attrib_locations);
+
+    program_.stop();
+}
+
+void
+TerrainRenderer::bind_textures()
+{
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, diffuse1_tex_);
+
+    glActiveTexture(GL_TEXTURE1);
+    glBindTexture(GL_TEXTURE_2D, diffuse2_tex_);
+
+    glActiveTexture(GL_TEXTURE2);
+    glBindTexture(GL_TEXTURE_2D, detail_tex_);
+
+    glActiveTexture(GL_TEXTURE3);
+    glBindTexture(GL_TEXTURE_2D, normal_map_tex_);
+
+    glActiveTexture(GL_TEXTURE4);
+    glBindTexture(GL_TEXTURE_2D, specular_map_tex_);
+
+    glActiveTexture(GL_TEXTURE5);
+    glBindTexture(GL_TEXTURE_2D, height_map_tex_);
+}
+
+void
+TerrainRenderer::deinit_textures()
+{
+    glDeleteTextures(1, &diffuse1_tex_);
+    glDeleteTextures(1, &diffuse2_tex_);
+    glDeleteTextures(1, &detail_tex_);
+}
+
+static void
+grid_conf(Mesh &mesh, int x, int y, int n_x, int n_y,
+          LibMatrix::vec3 &ul,
+          LibMatrix::vec3 &ll,
+          LibMatrix::vec3 &ur,
+          LibMatrix::vec3 &lr)
+{
+    struct PlaneMeshVertex {
+        LibMatrix::vec3 position;
+        LibMatrix::vec2 texcoord;
+        LibMatrix::vec3 normal;
+        LibMatrix::vec3 tangent;
+    };
+
+    LibMatrix::vec2 uv_ul(static_cast<float>(x) / n_x,
+            1.0 - static_cast<float>(y) / n_y);
+    LibMatrix::vec2 uv_lr(static_cast<float>(x + 1) / n_x,
+            1.0 - static_cast<float>(y + 1) / n_y);
+
+    LibMatrix::vec3 normal(0.0, 0.0, 1.0);
+    LibMatrix::vec3 tangent(1.0, 0.0, 0.0);
+
+    PlaneMeshVertex cell_vertices[] = {
+        {
+            ll,
+            LibMatrix::vec2(uv_ul.x(), uv_lr.y()),
+            normal,
+            tangent
+        },
+        {
+            lr,
+            LibMatrix::vec2(uv_lr.x(), uv_lr.y()),
+            normal,
+            tangent
+        },
+        {
+            ur,
+            LibMatrix::vec2(uv_lr.x(), uv_ul.y()),
+            normal,
+            tangent
+        },
+        {
+            ul,
+            LibMatrix::vec2(uv_ul.x(), uv_ul.y()),
+            normal,
+            tangent
+        }
+    };
+
+    unsigned int vertex_index[] = {0, 1, 2, 0, 2, 3};
+
+    for (size_t i = 0; i < sizeof(vertex_index) / sizeof(*vertex_index); i++) {
+        PlaneMeshVertex& vertex = cell_vertices[vertex_index[i]];
+
+        mesh.next_vertex();
+        mesh.set_attrib(0, vertex.position);
+        mesh.set_attrib(1, vertex.normal);
+        mesh.set_attrib(2, vertex.tangent);
+        mesh.set_attrib(3, vertex.texcoord);
+    }
+}
+
+void
+TerrainRenderer::create_mesh()
+{
+    std::vector<int> vertex_format;
+    vertex_format.push_back(3);
+    vertex_format.push_back(3);
+    vertex_format.push_back(3);
+    vertex_format.push_back(2);
+    mesh_.set_vertex_format(vertex_format);
+
+    mesh_.make_grid(256, 256, 6000, 6000, 0, grid_conf);
+    mesh_.build_vbo();
+}
+
diff --git a/src/scene-terrain/texture-renderer.cpp b/src/scene-terrain/texture-renderer.cpp
new file mode 100644
index 0000000..93d61db
--- /dev/null
+++ b/src/scene-terrain/texture-renderer.cpp
@@ -0,0 +1,69 @@
+/*
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis
+ */
+#include "renderer.h"
+
+TextureRenderer::TextureRenderer(const LibMatrix::vec2 &size, Program &program) :
+    BaseRenderer(size), program_(program)
+{
+    /* Create the mesh (quad) used for rendering */
+    create_mesh();
+}
+
+void
+TextureRenderer::create_mesh()
+{
+    // Set vertex format
+    std::vector<int> vertex_format;
+    vertex_format.push_back(3); // Position
+    mesh_.set_vertex_format(vertex_format);
+
+    mesh_.make_grid(1, 1, 2.0, 2.0, 0);
+    mesh_.build_vbo();
+
+    program_.start();
+
+    // Set attribute locations
+    std::vector<GLint> attrib_locations;
+    attrib_locations.push_back(program_["position"].location());
+    mesh_.set_attrib_locations(attrib_locations);
+
+    program_.stop();
+}
+
+void
+TextureRenderer::render()
+{
+    make_current();
+
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, input_texture_);
+
+    program_.start();
+
+    mesh_.render_vbo();
+
+    program_.stop();
+
+    update_mipmap();
+}
diff --git a/src/scene-texture.cpp b/src/scene-texture.cpp
new file mode 100644
index 0000000..12aec1b
--- /dev/null
+++ b/src/scene-texture.cpp
@@ -0,0 +1,346 @@
+/*
+ * Copyright © 2008 Ben Smith
+ * Copyright © 2010-2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Ben Smith (original glmark benchmark)
+ *  Alexandros Frantzis (glmark2)
+ *  Jesse Barker (glmark2)
+ */
+#include "scene.h"
+#include "mat.h"
+#include "stack.h"
+#include "vec.h"
+#include "log.h"
+#include "program.h"
+#include "shader-source.h"
+#include "texture.h"
+#include "model.h"
+#include "util.h"
+#include <cmath>
+
+using LibMatrix::vec3;
+using std::string;
+
+SceneTexture::SceneTexture(Canvas &pCanvas) :
+    Scene(pCanvas, "texture"), radius_(0.0),
+    orientModel_(false), orientationAngle_(0.0)
+{
+    const ModelMap& modelMap = Model::find_models();
+    string optionValues;
+    for (ModelMap::const_iterator modelIt = modelMap.begin();
+         modelIt != modelMap.end();
+         modelIt++)
+    {
+        static bool doSeparator(false);
+        if (doSeparator)
+        {
+            optionValues += ",";
+        }
+        const std::string& curName = modelIt->first;
+        optionValues += curName;
+        doSeparator = true;
+    }
+    options_["model"] = Scene::Option("model", "cube", "Which model to use",
+                                      optionValues);
+    options_["texture-filter"] = Scene::Option("texture-filter", "nearest",
+                                               "The texture filter to use",
+                                               "nearest,linear,linear-shader,mipmap");
+    optionValues = "";
+    const TextureMap& textureMap = Texture::find_textures();
+    for (TextureMap::const_iterator textureIt = textureMap.begin();
+         textureIt != textureMap.end();
+         textureIt++)
+    {
+        static bool doSeparator(false);
+        if (doSeparator)
+        {
+            optionValues += ",";
+        }
+        const std::string& curName = textureIt->first;
+        optionValues += curName;
+        doSeparator = true;
+    }
+    options_["texture"] = Scene::Option("texture", "crate-base", "Which texture to use",
+                                        optionValues);
+    options_["texgen"] = Scene::Option("texgen", "false",
+                                       "Whether to generate texcoords in the shader",
+                                       "false,true");
+}
+
+SceneTexture::~SceneTexture()
+{
+}
+
+bool
+SceneTexture::load()
+{
+    rotationSpeed_ = LibMatrix::vec3(36.0f, 36.0f, 36.0f);
+
+    running_ = false;
+
+    return true;
+}
+
+void
+SceneTexture::unload()
+{
+    mesh_.reset();
+}
+
+bool
+SceneTexture::setup()
+{
+    if (!Scene::setup())
+        return false;
+
+    static const std::string vtx_shader_filename(GLMARK_DATA_PATH"/shaders/light-basic.vert");
+    static const std::string vtx_shader_texgen_filename(GLMARK_DATA_PATH"/shaders/light-basic-texgen.vert");
+    static const std::string frg_shader_filename(GLMARK_DATA_PATH"/shaders/light-basic-tex.frag");
+    static const std::string frg_shader_bilinear_filename(GLMARK_DATA_PATH"/shaders/light-basic-tex-bilinear.frag");
+    static const LibMatrix::vec4 lightPosition(20.0f, 20.0f, 10.0f, 1.0f);
+    static const LibMatrix::vec4 materialDiffuse(1.0f, 1.0f, 1.0f, 1.0f);
+
+    // Create texture according to selected filtering
+    GLint min_filter = GL_NONE;
+    GLint mag_filter = GL_NONE;
+    const std::string &filter = options_["texture-filter"].value;
+
+    if (filter == "nearest") {
+        min_filter = GL_NEAREST;
+        mag_filter = GL_NEAREST;
+    }
+    else if (filter == "linear") {
+        min_filter = GL_LINEAR;
+        mag_filter = GL_LINEAR;
+    }
+    else if (filter == "linear-shader") {
+        min_filter = GL_NEAREST;
+        mag_filter = GL_NEAREST;
+    }
+    else if (filter == "mipmap") {
+        min_filter = GL_LINEAR_MIPMAP_LINEAR;
+        mag_filter = GL_LINEAR;
+    }
+
+    const string& whichTexture(options_["texture"].value);
+    if (!Texture::load(whichTexture, &texture_, min_filter, mag_filter, 0))
+        return false;
+
+    // Load shaders
+    bool doTexGen(options_["texgen"].value == "true");
+    ShaderSource vtx_source;
+    if (doTexGen) {
+        vtx_source.append_file(vtx_shader_texgen_filename);
+        vtx_source.add_const("PI", static_cast<float>(M_PI));
+    }
+    else {
+        vtx_source.append_file(vtx_shader_filename);
+    }
+    ShaderSource frg_source;
+    if (filter == "linear-shader") {
+        frg_source.append_file(frg_shader_bilinear_filename);
+        LibMatrix::vec2 texture_size(512, 512);
+        frg_source.add_const("TextureSize", texture_size);
+    }
+    else {
+        frg_source.append_file(frg_shader_filename);
+    }
+
+    // Add constants to shaders
+    vtx_source.add_const("LightSourcePosition", lightPosition);
+    vtx_source.add_const("MaterialDiffuse", materialDiffuse);
+
+    if (!Scene::load_shaders_from_strings(program_, vtx_source.str(),
+                                          frg_source.str()))
+    {
+        return false;
+    }
+
+    Model model;
+    const string& whichModel(options_["model"].value);
+    bool modelLoaded = model.load(whichModel);
+    if(!modelLoaded)
+        return false;
+
+    // Now that we're successfully loaded, there are a few quirks about
+    // some of the known models that we need to account for.  The draw
+    // logic for the scene wants to rotate the model around the Y axis.
+    // Most of our models are described this way.  Some need adjustment
+    // (an additional rotation that gets the model into the correct
+    // orientation).
+    //
+    // Here's a summary:
+    //
+    // Angel rotates around the Y axis
+    // Armadillo rotates around the Y axis
+    // Buddha rotates around the X axis
+    // Bunny rotates around the Y axis
+    // Dragon rotates around the X axis
+    // Horse rotates around the Y axis
+    if (whichModel == "buddha" || whichModel == "dragon")
+    {
+        orientModel_ = true;
+        orientationAngle_ = -90.0;
+        orientationVec_ = vec3(1.0, 0.0, 0.0);
+    }
+    else if (whichModel == "armadillo")
+    {
+        orientModel_ = true;
+        orientationAngle_ = 180.0; 
+        orientationVec_ = vec3(0.0, 1.0, 0.0);
+    }
+
+    if (model.needTexcoords())
+        model.calculate_texcoords();
+    model.calculate_normals();
+    // Tell the converter which attributes we care about
+    std::vector<std::pair<Model::AttribType, int> > attribs;
+    attribs.push_back(std::pair<Model::AttribType, int>(Model::AttribTypePosition, 3));
+    attribs.push_back(std::pair<Model::AttribType, int>(Model::AttribTypeNormal, 3));
+    if (!doTexGen) {
+        attribs.push_back(std::pair<Model::AttribType, int>(Model::AttribTypeTexcoord, 2));
+    }
+    model.convert_to_mesh(mesh_, attribs);
+    mesh_.build_vbo();
+
+    // Calculate a projection matrix that is a good fit for the model
+    vec3 maxVec = model.maxVec();
+    vec3 minVec = model.minVec();
+    vec3 diffVec = maxVec - minVec;
+    centerVec_ = maxVec + minVec;
+    centerVec_ /= 2.0;
+    float diameter = diffVec.length();
+    radius_ = diameter / 2;
+    float fovy = 2.0 * atanf(radius_ / (2.0 + radius_));
+    fovy /= M_PI;
+    fovy *= 180.0;
+    float aspect(static_cast<float>(canvas_.width())/static_cast<float>(canvas_.height()));
+    perspective_.setIdentity();
+    perspective_ *= LibMatrix::Mat4::perspective(fovy, aspect, 2.0, 2.0 + diameter);
+
+    program_.start();
+
+    std::vector<GLint> attrib_locations;
+    attrib_locations.push_back(program_["position"].location());
+    attrib_locations.push_back(program_["normal"].location());
+    if (doTexGen) {
+        program_["CenterPoint"] = centerVec_;
+    }
+    else {
+        attrib_locations.push_back(program_["texcoord"].location());
+    }
+    mesh_.set_attrib_locations(attrib_locations);
+
+    currentFrame_ = 0;
+    rotation_ = LibMatrix::vec3();
+    running_ = true;
+    startTime_ = Util::get_timestamp_us() / 1000000.0;
+    lastUpdateTime_ = startTime_;
+
+    return true;
+}
+
+void
+SceneTexture::teardown()
+{
+    program_.stop();
+    program_.release();
+
+    glDeleteTextures(1, &texture_);
+
+    Scene::teardown();
+}
+
+void
+SceneTexture::update()
+{
+    Scene::update();
+
+    double elapsed_time = lastUpdateTime_ - startTime_;
+
+    rotation_ = rotationSpeed_ * elapsed_time;
+}
+
+void
+SceneTexture::draw()
+{
+    // Load the ModelViewProjectionMatrix uniform in the shader
+    LibMatrix::Stack4 model_view;
+    model_view.translate(-centerVec_.x(), -centerVec_.y(), -(centerVec_.z() + 2.5 + radius_));
+    model_view.rotate(rotation_.x(), 1.0f, 0.0f, 0.0f);
+    model_view.rotate(rotation_.y(), 0.0f, 1.0f, 0.0f);
+    model_view.rotate(rotation_.z(), 0.0f, 0.0f, 1.0f);
+    if (orientModel_)
+    {
+        model_view.rotate(orientationAngle_, orientationVec_.x(), orientationVec_.y(), orientationVec_.z());
+    }
+    LibMatrix::mat4 model_view_proj(perspective_);
+    model_view_proj *= model_view.getCurrent();
+
+    program_["ModelViewProjectionMatrix"] = model_view_proj;
+
+    // Load the NormalMatrix uniform in the shader. The NormalMatrix is the
+    // inverse transpose of the model view matrix.
+    LibMatrix::mat4 normal_matrix(model_view.getCurrent());
+    normal_matrix.inverse().transpose();
+    program_["NormalMatrix"] = normal_matrix;
+
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, texture_);
+
+    mesh_.render_vbo();
+}
+
+Scene::ValidationResult
+SceneTexture::validate()
+{
+    static const double radius_3d(std::sqrt(3 * 2.0 * 2.0));
+
+    if (rotation_.x() != 0 || rotation_.y() != 0 || rotation_.z() != 0)
+        return Scene::ValidationUnknown;
+
+    Canvas::Pixel ref;
+
+    Canvas::Pixel pixel = canvas_.read_pixel(canvas_.width() / 2 + 3,
+                                             canvas_.height() / 2 + 3);
+
+    const std::string &filter = options_["texture-filter"].value;
+
+    if (filter == "nearest")
+        ref = Canvas::Pixel(0x2b, 0x2a, 0x28, 0xff);
+    else if (filter == "linear")
+        ref = Canvas::Pixel(0x2b, 0x2a, 0x28, 0xff);
+    else if (filter == "linear-shader")
+        ref = Canvas::Pixel(0x2d, 0x2c, 0x2a, 0xff);
+    else if (filter == "mipmap")
+        ref = Canvas::Pixel(0x2c, 0x2d, 0x2a, 0xff);
+    else
+        return Scene::ValidationUnknown;
+
+    double dist = pixel.distance_rgb(ref);
+
+    if (dist < radius_3d + 0.01) {
+        return Scene::ValidationSuccess;
+    }
+    else {
+        Log::debug("Validation failed! Expected: 0x%x Actual: 0x%x Distance: %f\n",
+                    ref.to_le32(), pixel.to_le32(), dist);
+        return Scene::ValidationFailure;
+    }
+}
diff --git a/src/scene.cpp b/src/scene.cpp
new file mode 100644
index 0000000..975537d
--- /dev/null
+++ b/src/scene.cpp
@@ -0,0 +1,288 @@
+/*
+ * Copyright © 2008 Ben Smith
+ * Copyright © 2010-2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Ben Smith (original glmark benchmark)
+ *  Alexandros Frantzis (glmark2)
+ */
+#include "scene.h"
+#include "log.h"
+#include "shader-source.h"
+#include "options.h"
+#include "util.h"
+#include <sstream>
+#include <cmath>
+#include <algorithm>
+
+using std::stringstream;
+using std::string;
+using std::map;
+
+Scene::Option::Option(const std::string &nam, const std::string &val, const std::string &desc,
+                      const std::string &values) :
+name(nam), value(val), default_value(val), description(desc), set(false)
+{
+    Util::split(values, ',', acceptable_values, Util::SplitModeNormal);
+}
+
+Scene::Scene(Canvas &pCanvas, const string &name) :
+    canvas_(pCanvas), name_(name),
+    startTime_(0), lastUpdateTime_(0), currentFrame_(0),
+    running_(0), duration_(0)
+{
+    options_["duration"] = Scene::Option("duration", "10.0",
+                                         "The duration of each benchmark in seconds");
+    options_["vertex-precision"] = Scene::Option("vertex-precision",
+                                                 "default,default,default,default",
+                                                 "The precision values for the vertex shader (\"int,float,sampler2d,samplercube\")");
+    options_["fragment-precision"] = Scene::Option("fragment-precision",
+                                                   "default,default,default,default",
+                                                   "The precision values for the fragment shader (\"int,float,sampler2d,samplercube\")");
+    /* FPS options */
+    options_["show-fps"] = Scene::Option("show-fps", "false",
+                                         "Show live FPS counter",
+                                         "false,true");
+    options_["fps-pos"] = Scene::Option("fps-pos", "-1.0,-1.0",
+                                         "The position on screen where to show FPS");
+    options_["fps-size"] = Scene::Option("fps-size", "0.03",
+                                         "The width of each glyph for the FPS");
+    /* Title options */
+    options_["title"] = Scene::Option("title", "",
+                                      "The scene title to show");
+    options_["title-pos"] = Scene::Option("title-pos", "-0.7,-1.0",
+                                      "The position on screen where to show the title");
+    options_["title-size"] = Scene::Option("title-size", "0.03",
+                                           "The width of each glyph in the title");
+}
+
+Scene::~Scene()
+{
+}
+
+bool
+Scene::supported(bool show_errors)
+{
+    static_cast<void>(show_errors);
+    return true;
+}
+
+bool
+Scene::load()
+{
+    return true;
+}
+
+void
+Scene::unload()
+{
+}
+
+bool
+Scene::setup()
+{
+    duration_ = Util::fromString<double>(options_["duration"].value);
+
+    ShaderSource::default_precision(
+            ShaderSource::Precision(options_["vertex-precision"].value),
+            ShaderSource::ShaderTypeVertex
+            );
+
+    ShaderSource::default_precision(
+            ShaderSource::Precision(options_["fragment-precision"].value),
+            ShaderSource::ShaderTypeFragment
+            );
+
+    currentFrame_ = 0;
+    running_ = false;
+    startTime_ = Util::get_timestamp_us() / 1000000.0;
+    lastUpdateTime_ = startTime_;
+
+    return supported(true);
+}
+
+void
+Scene::teardown()
+{
+}
+
+void
+Scene::update()
+{
+    double current_time = Util::get_timestamp_us() / 1000000.0;
+    double elapsed_time = current_time - startTime_;
+
+    currentFrame_++;
+
+    lastUpdateTime_ = current_time;
+
+    if (elapsed_time >= duration_)
+        running_ = false;
+}
+
+void
+Scene::draw()
+{
+}
+
+string
+Scene::info_string(const string &title)
+{
+    stringstream ss;
+
+    ss << "[" << name_ << "] " << Scene::construct_title(title);
+
+    return ss.str();
+}
+
+unsigned
+Scene::average_fps()
+{
+    double elapsed_time = lastUpdateTime_ - startTime_;
+    return currentFrame_ / elapsed_time;
+}
+
+bool
+Scene::set_option(const string &opt, const string &val)
+{
+    map<string, Option>::iterator iter = options_.find(opt);
+
+    if (iter == options_.end())
+        return false;
+
+    std::vector<std::string> &values(iter->second.acceptable_values);
+
+    if (!values.empty() && 
+        std::find(values.begin(), values.end(), val) == values.end())
+    {
+            return false;
+    }
+
+    iter->second.value = val;
+    iter->second.set = true;
+
+    return true;
+}
+
+void
+Scene::reset_options()
+{
+    for (map<string, Option>::iterator iter = options_.begin();
+         iter != options_.end();
+         iter++)
+    {
+        Option &opt = iter->second;
+
+        opt.value = opt.default_value;
+        opt.set = false;
+    }
+}
+
+bool
+Scene::set_option_default(const string &opt, const string &val)
+{
+    map<string, Option>::iterator iter = options_.find(opt);
+
+    if (iter == options_.end())
+        return false;
+
+    std::vector<std::string> &values(iter->second.acceptable_values);
+
+    if (!values.empty() && 
+        std::find(values.begin(), values.end(), val) == values.end())
+    {
+            return false;
+    }
+
+    iter->second.default_value = val;
+
+    return true;
+}
+
+
+string
+Scene::construct_title(const string &title)
+{
+    stringstream ss;
+
+    if (title == "") {
+        for (map<string, Option>::iterator iter = options_.begin();
+             iter != options_.end();
+             iter++)
+        {
+            if (Options::show_all_options || iter->second.set)
+            {
+                ss << iter->first << "=" << iter->second.value << ":";
+            }
+        }
+
+        if (ss.str().empty())
+            ss << "<default>:";
+    }
+    else
+        ss << title;
+
+    return ss.str();
+
+}
+
+bool
+Scene::load_shaders_from_strings(Program &program,
+                                 const std::string &vtx_shader,
+                                 const std::string &frg_shader,
+                                 const std::string &vtx_shader_filename,
+                                 const std::string &frg_shader_filename)
+{
+    program.init();
+
+    Log::debug("Loading vertex shader from file %s:\n%s",
+               vtx_shader_filename.c_str(), vtx_shader.c_str());
+
+    program.addShader(GL_VERTEX_SHADER, vtx_shader);
+    if (!program.valid()) {
+        Log::error("Failed to add vertex shader from file %s:\n  %s\n",
+                   vtx_shader_filename.c_str(),
+                   program.errorMessage().c_str());
+        program.release();
+        return false;
+    }
+
+    Log::debug("Loading fragment shader from file %s:\n%s",
+               frg_shader_filename.c_str(), frg_shader.c_str());
+
+    program.addShader(GL_FRAGMENT_SHADER, frg_shader);
+    if (!program.valid()) {
+        Log::error("Failed to add fragment shader from file %s:\n  %s\n",
+                   frg_shader_filename.c_str(),
+                   program.errorMessage().c_str());
+        program.release();
+        return false;
+    }
+
+    program.build();
+    if (!program.ready()) {
+        Log::error("Failed to link program created from files %s and %s:  %s\n",
+                   vtx_shader_filename.c_str(),
+                   frg_shader_filename.c_str(),
+                   program.errorMessage().c_str());
+        program.release();
+        return false;
+    }
+
+    return true;
+}
diff --git a/src/scene.h b/src/scene.h
new file mode 100644
index 0000000..8c4d752
--- /dev/null
+++ b/src/scene.h
@@ -0,0 +1,592 @@
+/*
+ * Copyright © 2008 Ben Smith
+ * Copyright © 2010-2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Ben Smith (original glmark benchmark)
+ *  Alexandros Frantzis (glmark2)
+ *  Marc Ordinas i Llopis, Collabora Ltd. (pulsar scene)
+ *  Jesse Barker (glmark2)
+ */
+#ifndef GLMARK2_SCENE_H_
+#define GLMARK2_SCENE_H_
+
+#include "gl-headers.h"
+
+#include "mesh.h"
+#include "vec.h"
+#include "program.h"
+
+#include <math.h>
+
+#include <string>
+#include <map>
+#include <list>
+#include <vector>
+#include "canvas.h"
+
+/**
+ * A configurable scene used for creating benchmarks.
+ */
+class Scene
+{
+public:
+    virtual ~Scene();
+
+    /**
+     * Scene options.
+     */
+    struct Option {
+        Option(const std::string &nam, const std::string &val, const std::string &desc,
+               const std::string &values = "");
+
+        Option() {}
+        std::string name;
+        std::string value;
+        std::string default_value;
+        std::string description;
+        std::vector<std::string> acceptable_values;
+        bool set;
+    };
+
+    /**
+     * The result of a validation check.
+     */
+    enum ValidationResult {
+        ValidationFailure,
+        ValidationSuccess,
+        ValidationUnknown
+    };
+
+    /**
+     * Checks whether this scene (in its current configuration) is supported.
+     *
+     * @param show_errors whether to log errors about unsupported features
+     *
+     * @return whether the scene is supported
+     */
+    virtual bool supported(bool show_errors);
+
+    /**
+     * Performs option-independent resource loading and configuration.
+     *
+     * It should be safe to call ::load() (and the corresponding ::unload())
+     * only once per program execution, although you may choose to do so more
+     * times to better manage resource consumption.
+     *
+     * @return whether loading succeeded
+     */
+    virtual bool load();
+
+    /**
+     * Performs option-independent resource unloading.
+     */
+    virtual void unload();
+
+    /**
+     * Performs option-dependent resource loading and configuration.
+     *
+     * This method also prepares a scene for a benchmark run.
+     * It should be called just before running a scene/benchmark.
+     *
+     * The base Scene::setup() method also checks whether a scene
+     * configuration is supported by calling ::supported(true).
+     *
+     * @return whether setting the scene up succeeded
+     */
+    virtual bool setup();
+
+    /**
+     * Performs option-dependent resource unloading.
+     *
+     * This method should be called just after running a scene/benchmark.
+     *
+     * @return the operation status
+     */
+    virtual void teardown();
+
+    /**
+     * Updates the scene state.
+     */
+    virtual void update();
+
+    /**
+     * Draws the current scene state.
+     */
+    virtual void draw();
+
+    /**
+     * Gets an informational string describing the scene.
+     *
+     * @param title if specified, a custom title to use, instead of the default
+     */
+    virtual std::string info_string(const std::string &title = "");
+
+    /**
+     * Sets the value of an option for this scene.
+     *
+     * @param opt the option to set
+     * @param val the value to set the option to
+     *
+     * @return whether the option value was set successfully
+     */
+    virtual bool set_option(const std::string &opt, const std::string &val);
+
+    /**
+     * Validates the current output of this scene.
+     *
+     * This method should be called after having called ::draw() once.
+     *
+     * @return the validation result
+     */
+    virtual ValidationResult validate() { return ValidationUnknown; }
+
+    /**
+     * Gets whether this scene is running.
+     *
+     * @return true if running, false otherwise
+     */
+    bool running() { return running_; }
+
+    /**
+     * Sets whether this scene is running.
+     *
+     * @return true if running, false otherwise
+     */
+    void running(bool r) { running_ = r; }
+
+    /**
+     * Gets the average FPS value for this scene.
+     *
+     * @return the average FPS value
+     */
+    unsigned average_fps();
+
+    /**
+     * Gets the name of the scene.
+     * @return the name of the scene
+     */
+    const std::string &name() { return name_; }
+
+    /**
+     * Resets all scene options to their default values.
+     */
+    void reset_options();
+
+    /**
+     * Sets the default value of a scene option.
+     */
+    bool set_option_default(const std::string &opt, const std::string &val);
+
+    /**
+     * Gets the scene options.
+     *
+     * @return the scene options
+     */
+    const std::map<std::string, Option> &options() { return options_; }
+
+    /**
+     * Gets a dummy scene object reference.
+     *
+     * @return the dummy Scene
+     */
+    static Scene &dummy()
+    {
+        static Scene dummy_scene(Canvas::dummy(), "");
+        return dummy_scene;
+    }
+
+    /**
+     * Loads a shader program from a pair of vertex and fragment shader strings.
+     *
+     * @return whether the operation succeeded
+     */
+    static bool load_shaders_from_strings(Program &program,
+                                          const std::string &vtx_shader,
+                                          const std::string &frg_shader,
+                                          const std::string &vtx_shader_filename = "None",
+                                          const std::string &frg_shader_filename = "None");
+
+protected:
+    Scene(Canvas &pCanvas, const std::string &name);
+    std::string construct_title(const std::string &title);
+
+    Canvas &canvas_;
+    std::string name_;
+    std::map<std::string, Option> options_;
+    double startTime_;
+    double lastUpdateTime_;
+    unsigned currentFrame_;
+    bool running_;
+    double duration_;      // Duration of run in seconds
+};
+
+/*
+ * Special Scene used for setting the default options
+ */
+class SceneDefaultOptions : public Scene
+{
+public:
+    SceneDefaultOptions(Canvas &pCanvas) : Scene(pCanvas, "") {}
+    bool set_option(const std::string &opt, const std::string &val);
+    bool setup();
+
+private:
+    std::list<std::pair<std::string, std::string> > defaultOptions_;
+};
+
+class SceneBuild : public Scene
+{
+public:
+    SceneBuild(Canvas &pCanvas);
+    bool load();
+    void unload();
+    bool setup();
+    void teardown();
+    void update();
+    void draw();
+    ValidationResult validate();
+
+    ~SceneBuild();
+
+protected:
+    Program program_;
+    LibMatrix::mat4 perspective_;
+    LibMatrix::vec3 centerVec_;
+    float radius_;
+    Mesh mesh_;
+    bool orientModel_;
+    float orientationAngle_;
+    LibMatrix::vec3 orientationVec_;
+    float rotation_;
+    float rotationSpeed_;
+    bool useVbo_;
+};
+
+class SceneTexture : public Scene
+{
+public:
+    SceneTexture(Canvas &pCanvas);
+    bool load();
+    void unload();
+    bool setup();
+    void teardown();
+    void update();
+    void draw();
+    ValidationResult validate();
+
+    ~SceneTexture();
+
+protected:
+    Program program_;
+    Mesh mesh_;
+    GLuint texture_;
+    float radius_;
+    bool orientModel_;
+    float orientationAngle_;
+    LibMatrix::vec3 orientationVec_;
+    LibMatrix::mat4 perspective_;
+    LibMatrix::vec3 centerVec_;
+    LibMatrix::vec3 rotation_;
+    LibMatrix::vec3 rotationSpeed_;
+};
+
+class SceneShading : public Scene
+{
+public:
+    SceneShading(Canvas &pCanvas);
+    bool load();
+    void unload();
+    bool setup();
+    void teardown();
+    void update();
+    void draw();
+    ValidationResult validate();
+
+    ~SceneShading();
+
+protected:
+    Program program_;
+    float radius_;
+    bool orientModel_;
+    float orientationAngle_;
+    LibMatrix::vec3 orientationVec_;
+    LibMatrix::vec3 centerVec_;
+    LibMatrix::mat4 perspective_;
+    Mesh mesh_;
+    float rotation_;
+    float rotationSpeed_;
+};
+
+class SceneGrid : public Scene
+{
+public:
+    SceneGrid(Canvas &pCanvas, const std::string &name);
+    virtual bool load();
+    virtual void unload();
+    virtual bool setup();
+    virtual void teardown();
+    virtual void update();
+    virtual void draw();
+    virtual ValidationResult validate();
+
+    ~SceneGrid();
+
+protected:
+    Program program_;
+    Mesh mesh_;
+    float rotation_;
+    float rotationSpeed_;
+};
+
+class SceneConditionals : public SceneGrid
+{
+public:
+    SceneConditionals(Canvas &pCanvas);
+    bool setup();
+    ValidationResult validate();
+
+    ~SceneConditionals();
+};
+
+class SceneFunction : public SceneGrid
+{
+public:
+    SceneFunction(Canvas &pCanvas);
+    bool setup();
+    ValidationResult validate();
+
+    ~SceneFunction();
+};
+
+class SceneLoop : public SceneGrid
+{
+public:
+    SceneLoop(Canvas &pCanvas);
+    bool setup();
+    ValidationResult validate();
+
+    ~SceneLoop();
+};
+
+class SceneBump : public Scene
+{
+public:
+    SceneBump(Canvas &pCanvas);
+    bool load();
+    void unload();
+    bool setup();
+    void teardown();
+    void update();
+    void draw();
+    ValidationResult validate();
+
+    ~SceneBump();
+
+protected:
+    Program program_;
+    Mesh mesh_;
+    GLuint texture_;
+    float rotation_;
+    float rotationSpeed_;
+private:
+    bool setup_model_plain(const std::string &type);
+    bool setup_model_normals();
+    bool setup_model_normals_tangent();
+    bool setup_model_height();
+};
+
+class SceneEffect2D : public Scene
+{
+public:
+    SceneEffect2D(Canvas &pCanvas);
+    bool load();
+    void unload();
+    bool setup();
+    void teardown();
+    void update();
+    void draw();
+    ValidationResult validate();
+
+    ~SceneEffect2D();
+
+protected:
+    Program program_;
+
+    Mesh mesh_;
+    GLuint texture_;
+};
+
+class ScenePulsar : public Scene
+{
+public:
+    ScenePulsar(Canvas &pCanvas);
+    bool load();
+    void unload();
+    bool setup();
+    void teardown();
+    void update();
+    void draw();
+    ValidationResult validate();
+
+    ~ScenePulsar();
+
+protected:
+    int numQuads_;
+    Program program_;
+    Mesh mesh_;
+    LibMatrix::vec3 scale_;
+    std::vector<LibMatrix::vec3> rotations_;
+    std::vector<LibMatrix::vec3> rotationSpeeds_;
+    GLuint texture_;
+
+private:
+    void create_and_setup_mesh();
+};
+
+struct SceneDesktopPrivate;
+
+class SceneDesktop : public Scene
+{
+public:
+    SceneDesktop(Canvas &canvas);
+    bool load();
+    void unload();
+    bool setup();
+    void teardown();
+    void update();
+    void draw();
+    ValidationResult validate();
+
+    ~SceneDesktop();
+
+private:
+    SceneDesktopPrivate *priv_;
+};
+
+struct SceneBufferPrivate;
+
+class SceneBuffer : public Scene
+{
+public:
+    SceneBuffer(Canvas &canvas);
+    bool supported(bool show_errors);
+    bool load();
+    void unload();
+    bool setup();
+    void teardown();
+    void update();
+    void draw();
+    ValidationResult validate();
+
+    ~SceneBuffer();
+
+private:
+    SceneBufferPrivate *priv_;
+};
+
+class SceneIdeasPrivate;
+
+class SceneIdeas : public Scene
+{
+public:
+    SceneIdeas(Canvas &pCanvas);
+    bool load();
+    void unload();
+    bool setup();
+    void teardown();
+    void update();
+    void draw();
+    ValidationResult validate();
+
+    ~SceneIdeas();
+
+private:
+    SceneIdeasPrivate* priv_;
+};
+
+class SceneTerrainPrivate;
+
+class SceneTerrain : public Scene
+{
+public:
+    SceneTerrain(Canvas &pCanvas);
+    bool supported(bool show_errors);
+    bool load();
+    void unload();
+    bool setup();
+    void teardown();
+    void update();
+    void draw();
+    ValidationResult validate();
+
+    ~SceneTerrain();
+
+private:
+    SceneTerrainPrivate* priv_;
+};
+
+class JellyfishPrivate;
+class SceneJellyfish : public Scene
+{
+    JellyfishPrivate* priv_;
+public:
+    SceneJellyfish(Canvas &pCanvas);
+    ~SceneJellyfish();
+    bool load();
+    void unload();
+    bool setup();
+    void teardown();
+    void update();
+    void draw();
+    ValidationResult validate();
+};
+
+class ShadowPrivate;
+class SceneShadow : public Scene
+{
+    ShadowPrivate* priv_;
+public:
+    SceneShadow(Canvas& canvas);
+    bool supported(bool show_errors);
+    bool load();
+    void unload();
+    bool setup();
+    void teardown();
+    void update();
+    void draw();
+    ValidationResult validate();
+};
+
+class RefractPrivate;
+class SceneRefract : public Scene
+{
+    RefractPrivate* priv_;
+public:
+    SceneRefract(Canvas& canvas);
+    bool supported(bool show_errors);
+    bool load();
+    void unload();
+    bool setup();
+    void teardown();
+    void update();
+    void draw();
+    ValidationResult validate();
+};
+
+#endif
diff --git a/src/text-renderer.cpp b/src/text-renderer.cpp
new file mode 100644
index 0000000..93d87fb
--- /dev/null
+++ b/src/text-renderer.cpp
@@ -0,0 +1,292 @@
+/*
+ * Copyright © 2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis (glmark2)
+ */
+#include "text-renderer.h"
+#include "gl-headers.h"
+#include "scene.h"
+#include "shader-source.h"
+#include "vec.h"
+#include "mat.h"
+#include "texture.h"
+
+using LibMatrix::vec2;
+using LibMatrix::mat4;
+
+/* These are specific to the glyph texture atlas we are using */
+static const unsigned int texture_size(512);
+static const vec2 glyph_size_pixels(29.0, 57.0);
+static const vec2 glyph_size(glyph_size_pixels/texture_size);
+
+/******************
+ * Public methods *
+ ******************/
+
+/**
+ * TextRenderer default constructor.
+ */
+TextRenderer::TextRenderer(Canvas& canvas) :
+    canvas_(canvas), dirty_(false), position_(-1.0, -1.0),
+    texture_(0)
+{
+    size(0.03);
+
+    glGenBuffers(2, vbo_);
+    ShaderSource vtx_source(GLMARK_DATA_PATH"/shaders/text-renderer.vert");
+    ShaderSource frg_source(GLMARK_DATA_PATH"/shaders/text-renderer.frag");
+
+    if (!Scene::load_shaders_from_strings(program_, vtx_source.str(),
+                                          frg_source.str()))
+    {
+        return;
+    }
+
+    GLint prev_program;
+    glGetIntegerv(GL_CURRENT_PROGRAM, &prev_program);
+
+    program_.start();
+    program_["Texture0"] = 0;
+
+    glUseProgram(prev_program);
+
+    /* Load the glyph texture atlas */
+    Texture::find_textures();
+    Texture::load("glyph-atlas", &texture_,
+                  GL_LINEAR_MIPMAP_LINEAR, GL_LINEAR,0);
+}
+
+TextRenderer::~TextRenderer()
+{
+    glDeleteBuffers(2, vbo_);
+    glDeleteTextures(1, &texture_);
+}
+
+/**
+ * Sets the text string to render.
+ *
+ * @param t the text string
+ */
+void
+TextRenderer::text(const std::string& t)
+{
+    if (text_ != t) {
+        text_ = t;
+        dirty_ = true;
+    }
+}
+
+/**
+ * Sets the screen position to render at.
+ *
+ * @param t the position
+ */
+void
+TextRenderer::position(const LibMatrix::vec2& p)
+{
+    if (position_ != p) {
+        position_ = p;
+        dirty_ = true;
+    }
+}
+
+/**
+ * Sets the size of each rendered glyph.
+ *
+ * The size corresponds to the width of each glyph
+ * in normalized screen coordinates.
+ *
+ * @param s the size of each glyph
+ */
+void
+TextRenderer::size(float s)
+{
+    if (size_.x() != s) {
+        /* Take into account the glyph and canvas aspect ratio */
+        double canvas_aspect =
+            static_cast<double>(canvas_.width()) / canvas_.height();
+        double glyph_aspect_rev = glyph_size.y() / glyph_size.x();
+        size_ = vec2(s, s * canvas_aspect * glyph_aspect_rev);
+        dirty_ = true;
+    }
+}
+
+/**
+ * Renders the text.
+ */
+void
+TextRenderer::render()
+{
+    /* Save state */
+    GLint prev_program = 0;
+    GLint prev_array_buffer = 0;
+    GLint prev_elem_array_buffer = 0;
+    GLint prev_blend_src_rgb = 0;
+    GLint prev_blend_dst_rgb = 0;
+    GLint prev_blend_src_alpha = 0;
+    GLint prev_blend_dst_alpha = 0;
+    GLboolean prev_blend = GL_FALSE;
+    GLboolean prev_depth_test = GL_FALSE;
+    glGetIntegerv(GL_CURRENT_PROGRAM, &prev_program);
+    glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &prev_array_buffer);
+    glGetIntegerv(GL_ELEMENT_ARRAY_BUFFER_BINDING, &prev_elem_array_buffer);
+    glGetIntegerv(GL_BLEND_SRC_RGB, &prev_blend_src_rgb);
+    glGetIntegerv(GL_BLEND_DST_RGB, &prev_blend_dst_rgb);
+    glGetIntegerv(GL_BLEND_SRC_ALPHA, &prev_blend_src_alpha);
+    glGetIntegerv(GL_BLEND_DST_ALPHA, &prev_blend_dst_alpha);
+    glGetBooleanv(GL_BLEND, &prev_blend);
+    glGetBooleanv(GL_DEPTH_TEST, &prev_depth_test);
+
+    /* Set new state */
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, texture_);
+    glBindBuffer(GL_ARRAY_BUFFER, vbo_[0]);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, vbo_[1]);
+    glEnable(GL_BLEND);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+    glDisable(GL_DEPTH_TEST);
+
+    if (dirty_) {
+        create_geometry();
+        dirty_ = false;
+    }
+
+    program_.start();
+    GLint position_loc = program_["position"].location();
+    GLint texcoord_loc = program_["texcoord"].location();
+
+    /* Render */
+    glEnableVertexAttribArray(position_loc);
+    glEnableVertexAttribArray(texcoord_loc);
+    glVertexAttribPointer(position_loc, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), 0);
+    glVertexAttribPointer(texcoord_loc, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float),
+                          reinterpret_cast<const GLvoid *>(2 * sizeof(float)));
+
+    glDrawElements(GL_TRIANGLES, 6 * text_.length(), GL_UNSIGNED_SHORT, 0);
+
+    glDisableVertexAttribArray(texcoord_loc);
+    glDisableVertexAttribArray(position_loc);
+
+    /* Restore state */
+    if (prev_depth_test == GL_TRUE)
+        glEnable(GL_DEPTH_TEST);
+    if (prev_blend == GL_FALSE)
+        glDisable(GL_BLEND);
+    glBlendFuncSeparate(prev_blend_src_rgb, prev_blend_dst_rgb,
+                        prev_blend_src_alpha, prev_blend_dst_alpha);
+    glBindBuffer(GL_ARRAY_BUFFER, prev_array_buffer);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, prev_elem_array_buffer);
+    glUseProgram(prev_program);
+}
+
+/*******************
+ * Private methods *
+ *******************/
+
+/**
+ * Creates the geometry needed to render the text.
+ *
+ * This method assumes that the text VBOs are properly bound.
+ */
+void
+TextRenderer::create_geometry()
+{
+    std::vector<float> array;
+    std::vector<GLushort> elem_array;
+    vec2 pos(position_);
+
+    for (size_t i = 0; i < text_.size(); i++) {
+        vec2 texcoord = get_glyph_coords(text_[i]);
+
+        /* Emit the elements for this glyph quad */
+        /* Lower left */
+        array.push_back(pos.x());
+        array.push_back(pos.y());
+        array.push_back(texcoord.x());
+        array.push_back(texcoord.y());
+
+        /* Lower right */
+        pos.x(pos.x() + size_.x());
+        texcoord.x(texcoord.x() + glyph_size.x());
+        array.push_back(pos.x());
+        array.push_back(pos.y());
+        array.push_back(texcoord.x());
+        array.push_back(texcoord.y());
+
+        /* Upper left */
+        pos.x(pos.x() - size_.x());
+        pos.y(pos.y() + size_.y());
+        texcoord.x(texcoord.x() - glyph_size.x());
+        texcoord.y(texcoord.y() + glyph_size.y());
+        array.push_back(pos.x());
+        array.push_back(pos.y());
+        array.push_back(texcoord.x());
+        array.push_back(texcoord.y());
+
+        /* Upper right */
+        pos.x(pos.x() + size_.x());
+        texcoord.x(texcoord.x() + glyph_size.x());
+        array.push_back(pos.x());
+        array.push_back(pos.y());
+        array.push_back(texcoord.x());
+        array.push_back(texcoord.y());
+
+        /* Prepare for the next glyph */
+        pos.y(pos.y() - size_.y());
+
+        /* Emit the element indices for this glyph quad */
+        elem_array.push_back(4 * i);
+        elem_array.push_back(4 * i + 1);
+        elem_array.push_back(4 * i + 2);
+        elem_array.push_back(4 * i + 2);
+        elem_array.push_back(4 * i + 1);
+        elem_array.push_back(4 * i + 3);
+    }
+
+    /* Load the data into the corresponding VBOs */
+    glBufferData(GL_ARRAY_BUFFER, array.size() * sizeof(float),
+                 &array[0], GL_DYNAMIC_DRAW);
+
+    glBufferData(GL_ELEMENT_ARRAY_BUFFER, elem_array.size() * sizeof(GLushort),
+                 &elem_array[0], GL_DYNAMIC_DRAW);
+}
+
+/**
+ * Gets the texcoords of a glyph in the glyph texture atlas.
+ *
+ * @param c the character to get the glyph texcoords of
+ *
+ * @return the texcoords
+ */
+vec2
+TextRenderer::get_glyph_coords(char c)
+{
+    static const unsigned int glyphs_per_row(texture_size / glyph_size_pixels.x());
+
+    /* We only support the ASCII printable characters */
+    if (c < 32 || c >= 127)
+        c = 32;
+
+    int n = c - 32;
+    int row = n / glyphs_per_row;
+    int col = n % glyphs_per_row;
+
+    return vec2(col * glyph_size.x(), 1.0 - (row + 1) * glyph_size.y());
+}
+
diff --git a/src/text-renderer.h b/src/text-renderer.h
new file mode 100644
index 0000000..d5b2dfb
--- /dev/null
+++ b/src/text-renderer.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright © 2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis (glmark2)
+ */
+#ifndef GLMARK2_TEXT_RENDERER_H_
+#define GLMARK2_TEXT_RENDERER_H_
+
+#include <string>
+#include "gl-headers.h"
+#include "vec.h"
+#include "program.h"
+#include "canvas.h"
+
+/**
+ * Renders text using OpenGL textures.
+ */
+class TextRenderer
+{
+public:
+    TextRenderer(Canvas& canvas);
+    ~TextRenderer();
+
+    void text(const std::string& t);
+    void position(const LibMatrix::vec2& p);
+    void size(float s);
+
+    void render();
+
+private:
+    void create_geometry();
+    LibMatrix::vec2 get_glyph_coords(char c);
+
+    Canvas& canvas_;
+    bool dirty_;
+    std::string text_;
+    LibMatrix::vec2 position_;
+    LibMatrix::vec2 size_;
+    Program program_;
+    GLuint vbo_[2];
+    GLuint texture_;
+};
+
+#endif
diff --git a/src/texture.cpp b/src/texture.cpp
new file mode 100644
index 0000000..a3c503a
--- /dev/null
+++ b/src/texture.cpp
@@ -0,0 +1,212 @@
+/*
+ * Copyright © 2008 Ben Smith
+ * Copyright © 2010-2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Ben Smith (original glmark benchmark)
+ *  Alexandros Frantzis (glmark2)
+ */
+#include "texture.h"
+#include "log.h"
+#include "util.h"
+#include "image-reader.h"
+
+#include <cstdarg>
+#include <vector>
+
+class ImageData {
+    void resize(unsigned int w, unsigned int h, unsigned int b)
+    {
+        width = w;
+        height = h;
+        bpp = b;
+        delete [] pixels;
+        pixels = new unsigned char[bpp * width * height];
+    }
+
+public:
+    ImageData() : pixels(0), width(0), height(0), bpp(0) {}
+    ~ImageData() { delete [] pixels; }
+    bool load(ImageReader &reader);
+
+    unsigned char *pixels;
+    unsigned int width;
+    unsigned int height;
+    unsigned int bpp;
+};
+
+bool
+ImageData::load(ImageReader &reader)
+{
+    if (reader.error())
+        return false;
+
+    resize(reader.width(), reader.height(), reader.pixelBytes());
+
+    Log::debug("    Height: %d Width: %d Bpp: %d\n", width, height, bpp);
+
+    /* 
+     * Copy the row data to the image buffer in reverse Y order, suitable
+     * for texture upload.
+     */
+    unsigned char *ptr = &pixels[bpp * width * (height - 1)];
+
+    while (reader.nextRow(ptr))
+        ptr -= bpp * width;
+
+    return !reader.error();
+}
+
+static void
+setup_texture(GLuint *tex, ImageData &image, GLint min_filter, GLint mag_filter)
+{
+    GLenum format = image.bpp == 3 ? GL_RGB : GL_RGBA;
+
+    glGenTextures(1, tex);
+    glBindTexture(GL_TEXTURE_2D, *tex);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, min_filter);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, mag_filter);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+    glTexImage2D(GL_TEXTURE_2D, 0, format, image.width, image.height, 0,
+                 format, GL_UNSIGNED_BYTE, image.pixels);
+
+    if ((min_filter != GL_NEAREST && min_filter != GL_LINEAR) ||
+        (mag_filter != GL_NEAREST && mag_filter != GL_LINEAR))
+    {
+        glGenerateMipmap(GL_TEXTURE_2D);
+    }
+}
+
+namespace TexturePrivate
+{
+TextureMap textureMap;
+}
+
+bool
+Texture::load(const std::string &textureName, GLuint *pTexture, ...)
+{
+    // Make sure the named texture is in the map.
+    TextureMap::const_iterator textureIt = TexturePrivate::textureMap.find(textureName);
+    if (textureIt == TexturePrivate::textureMap.end())
+    {
+        return false;
+    }
+
+    // Pull the pathname out of the descriptor and use it for the PNG load.
+    TextureDescriptor* desc = textureIt->second;
+    const std::string& filename = desc->pathname();
+    ImageData image;
+
+    if (desc->filetype() == TextureDescriptor::FileTypePNG) {
+        PNGReader reader(filename);
+        if (!image.load(reader))
+            return false;
+    }
+    else if (desc->filetype() == TextureDescriptor::FileTypeJPEG) {
+        JPEGReader reader(filename);
+        if (!image.load(reader))
+            return false;
+    }
+
+    va_list ap;
+    va_start(ap, pTexture);
+    GLint arg;
+
+    while ((arg = va_arg(ap, GLint)) != 0) {
+        GLint arg2 = va_arg(ap, GLint);
+        setup_texture(pTexture, image, arg, arg2);
+        pTexture++;
+    }
+
+    va_end(ap);
+
+    return true;
+}
+
+const TextureMap&
+Texture::find_textures()
+{
+    using std::vector;
+    using std::string;
+    if (!TexturePrivate::textureMap.empty())
+    {
+        return TexturePrivate::textureMap;
+    }
+    vector<string> pathVec;
+    string dataDir(GLMARK_DATA_PATH"/textures");
+    Util::list_files(dataDir, pathVec);
+    // Now that we have a list of all of the image files available to us,
+    // let's go through and pull out the names and what format they're in
+    // so the scene can decide which ones to use.
+    for(vector<string>::const_iterator pathIt = pathVec.begin();
+        pathIt != pathVec.end();
+        pathIt++)
+    {
+        const string& curPath = *pathIt;
+        string::size_type namePos(0);
+        string::size_type slashPos = curPath.rfind("/");
+        if (slashPos != string::npos)
+        {
+            // Advance to the first character after the last slash
+            namePos = slashPos + 1;
+        }
+
+        // Find the position of the extension
+        string::size_type pngExtPos = curPath.rfind(".png");
+        string::size_type jpgExtPos = curPath.rfind(".jpg");
+        string::size_type extPos(string::npos);
+
+        // Select the extension that's closer to the end of the file name
+        if (pngExtPos == string::npos)
+        {
+            extPos = jpgExtPos;
+        }
+        else if (jpgExtPos == string::npos)
+        {
+            extPos = pngExtPos;
+        }
+        else
+        {
+            extPos = std::max(pngExtPos, jpgExtPos);
+        }
+
+        if (extPos == string::npos)
+        {
+            // We can't trivially determine it's an image file so skip it...
+            continue;
+        }
+
+        // Set the file type based on the extension
+        TextureDescriptor::FileType type(TextureDescriptor::FileTypeUnknown);
+        if (extPos == pngExtPos)
+        {
+            type = TextureDescriptor::FileTypePNG;
+        }
+        else if (extPos == jpgExtPos)
+        {
+            type = TextureDescriptor::FileTypeJPEG;
+        }
+
+        string name(curPath, namePos, extPos - namePos);
+        TextureDescriptor* desc = new TextureDescriptor(name, curPath, type);
+        TexturePrivate::textureMap.insert(std::make_pair(name, desc));
+    }
+
+    return TexturePrivate::textureMap;
+}
diff --git a/src/texture.h b/src/texture.h
new file mode 100644
index 0000000..17623ef
--- /dev/null
+++ b/src/texture.h
@@ -0,0 +1,87 @@
+/*
+ * Copyright © 2008 Ben Smith
+ * Copyright © 2010-2011 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Ben Smith (original glmark benchmark)
+ *  Alexandros Frantzis (glmark2)
+ */
+#ifndef GLMARK2_TEXTURE_H_
+#define GLMARK2_TEXTURE_H_
+
+#include "gl-headers.h"
+
+#include <string>
+#include <map>
+
+/**
+ * A descriptor for a texture file.
+ */
+class TextureDescriptor
+{
+public:
+    enum FileType {
+        FileTypeUnknown,
+        FileTypePNG,
+        FileTypeJPEG,
+    };
+
+    TextureDescriptor(const std::string& name, const std::string& pathname,
+                      FileType filetype) :
+        name_(name),
+        pathname_(pathname),
+        filetype_(filetype) {}
+    ~TextureDescriptor() {}
+    const std::string& pathname() const { return pathname_; }
+    FileType filetype() const { return filetype_; }
+private:
+    std::string name_;
+    std::string pathname_;
+    FileType filetype_;
+    TextureDescriptor();
+};
+
+typedef std::map<std::string, TextureDescriptor*> TextureMap;
+
+class Texture
+{
+public:
+    /**
+     * Load a texture by name.
+     *
+     * You must initialize the available texture collection using
+     * Texture::find_textures() before using this method.
+     *
+     * @name:        the texture name
+     *
+     * @return:      true if the operation succeeded, false otherwise
+     */
+    static bool load(const std::string &name, GLuint *pTexture, ...);
+    /**
+     * Locate all available textures.
+     *
+     * This method scans the built-in data paths and builds a database of usable
+     * textures available to scenes.  Map is available on a read-only basis to
+     * scenes that might find it useful for listing textures, etc.
+     *
+     * @return:     a map containing information about the located textures
+     */
+    static const TextureMap& find_textures();
+};
+
+#endif
diff --git a/src/wscript_build b/src/wscript_build
new file mode 100644
index 0000000..b742b48
--- /dev/null
+++ b/src/wscript_build
@@ -0,0 +1,92 @@
+all_sources = bld.path.ant_glob('*.cpp scene-ideas/*.cc scene-terrain/*.cpp')
+common_sources = [f for f in all_sources if f.name.find('canvas-') == -1 and
+                                            f.name.find('android') == -1 and
+                                            f.name.find('egl-') == -1]
+gl_sources = ['canvas-x11.cpp', 'canvas-x11-glx.cpp']
+glesv2_sources = ['canvas-x11.cpp', 'canvas-x11-egl.cpp', 'egl-state.cpp']
+gl_drm_sources = ['canvas-drm.cpp', 'egl-state.cpp']
+glesv2_drm_sources = ['canvas-drm.cpp', 'egl-state.cpp']
+libmatrix_sources = [f for f in bld.path.ant_glob('libmatrix/*.cc')
+                     if not f.name.endswith('test.cc')]
+includes = ['.', 'scene-ideas', 'scene-terrain']
+
+if bld.env.USE_GL:
+    bld(
+        features = ['cxx', 'cxxstlib'],
+        source   = libmatrix_sources,
+        target   = 'matrix',
+        lib      = ['m'],
+        includes = ['.'],
+        export_includes = 'libmatrix',
+        defines  = ['USE_GL', 'USE_EXCEPTIONS']
+        )
+    bld(
+        features     = ['cxx', 'cprogram'],
+        source       = common_sources + gl_sources,
+        target       = 'glmark2',
+        use          = ['x11', 'gl', 'matrix', 'libpng12'],
+        lib          = ['m', 'jpeg'],
+        includes     = includes,
+        defines      = ['USE_GL', 'USE_EXCEPTIONS']
+        )
+
+if bld.env.USE_GLESv2:
+    bld(
+        features = ['cxx', 'cxxstlib'],
+        source   = libmatrix_sources,
+        target   = 'matrix-es2',
+        lib      = ['m'],
+        includes = ['.'],
+        export_includes = 'libmatrix',
+        defines  = ['USE_GLESv2', 'USE_EXCEPTIONS']
+        )
+    bld(
+        features     = ['cxx', 'cprogram'],
+        source       = common_sources + glesv2_sources,
+        target       = 'glmark2-es2',
+        use          = ['x11', 'egl', 'glesv2', 'matrix-es2', 'libpng12'],
+        lib          = ['m', 'dl', 'jpeg'],
+        includes     = includes,
+        defines      = ['USE_GLESv2', 'USE_EXCEPTIONS']
+        )
+
+if bld.env.USE_GL_DRM:
+    bld(
+        features = ['cxx', 'cxxstlib'],
+        source   = libmatrix_sources,
+        target   = 'matrix-drm',
+        lib      = ['m'],
+        includes = ['.'],
+        export_includes = 'libmatrix',
+        defines  = ['USE_DRM', '__GBM__', 'USE_GL', 'USE_EXCEPTIONS']
+        )
+    bld(
+        features     = ['cxx', 'cprogram'],
+        source       = common_sources + gl_drm_sources,
+        target       = 'glmark2-drm',
+        use          = ['egl', 'gl', 'matrix-drm', 'libpng12', 'drm', 'gbm'],
+        lib          = ['m', 'jpeg', 'dl'],
+        includes     = includes,
+        defines      = ['USE_DRM', '__GBM__', 'USE_GL']
+        )
+
+if bld.env.USE_GLESv2_DRM:
+    bld(
+        features = ['cxx', 'cxxstlib'],
+        source   = libmatrix_sources,
+        target   = 'matrix-es2-drm',
+        lib      = ['m'],
+        includes = ['.'],
+        export_includes = 'libmatrix',
+        defines  = ['USE_DRM', '__GBM__', 'USE_GLESv2', 'USE_EXCEPTIONS']
+        )
+    bld(
+        features     = ['cxx', 'cprogram'],
+        source       = common_sources + glesv2_drm_sources,
+        target       = 'glmark2-es2-drm',
+        use          = ['egl', 'glesv2', 'matrix-es2-drm', 'libpng12', 'drm',
+                        'gbm'],
+        lib          = ['m', 'jpeg', 'dl'],
+        includes     = includes,
+        defines      = ['USE_DRM', '__GBM__', 'USE_GLESv2']
+        )
diff --git a/waf b/waf
new file mode 100755
index 0000000..3d52896
--- /dev/null
+++ b/waf
@@ -0,0 +1,162 @@
+#!/usr/bin/env python
+# encoding: ISO8859-1
+# Thomas Nagy, 2005-2011
+
+"""
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+
+3. The name of the author may not be used to endorse or promote products
+   derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
+IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+"""
+
+import os, sys
+
+VERSION="1.6.11"
+REVISION="30618c54883417962c38f5d395f83584"
+INSTALL=''
+C1='#*'
+C2='#%'
+cwd = os.getcwd()
+join = os.path.join
+
+
+WAF='waf'
+def b(x):
+	return x
+if sys.hexversion>0x300000f:
+	WAF='waf3'
+	def b(x):
+		return x.encode()
+
+def err(m):
+	print(('\033[91mError: %s\033[0m' % m))
+	sys.exit(1)
+
+def unpack_wafdir(dir):
+	f = open(sys.argv[0],'rb')
+	c = 'corrupt archive (%d)'
+	while 1:
+		line = f.readline()
+		if not line: err('run waf-light from a folder containing waflib')
+		if line == b('#==>\n'):
+			txt = f.readline()
+			if not txt: err(c % 1)
+			if f.readline() != b('#<==\n'): err(c % 2)
+			break
+	if not txt: err(c % 3)
+	txt = txt[1:-1].replace(b(C1), b('\n')).replace(b(C2), b('\r'))
+
+	import shutil, tarfile
+	try: shutil.rmtree(dir)
+	except OSError: pass
+	try:
+		for x in ['Tools', 'extras']:
+			os.makedirs(join(dir, 'waflib', x))
+	except OSError:
+		err("Cannot unpack waf lib into %s\nMove waf into a writeable directory" % dir)
+
+	os.chdir(dir)
+	tmp = 't.bz2'
+	t = open(tmp,'wb')
+	t.write(txt)
+	t.close()
+
+	try:
+		t = tarfile.open(tmp)
+	except:
+		try:
+			os.system('bunzip2 t.bz2')
+			t = tarfile.open('t')
+			tmp = 't'
+		except:
+			os.chdir(cwd)
+			try: shutil.rmtree(dir)
+			except OSError: pass
+			err("Waf cannot be unpacked, check that bzip2 support is present")
+
+	for x in t: t.extract(x)
+	t.close()
+
+	for x in ['Tools', 'extras']:
+		os.chmod(join('waflib',x), 493)
+
+	if sys.hexversion<0x300000f:
+		sys.path = [join(dir, 'waflib')] + sys.path
+		import fixpy2
+		fixpy2.fixdir(dir)
+
+	os.unlink(tmp)
+	os.chdir(cwd)
+
+	try: dir = unicode(dir, 'mbcs')
+	except: pass
+	try:
+		from ctypes import windll
+		windll.kernel32.SetFileAttributesW(dir, 2)
+	except:
+		pass
+
+def test(dir):
+	try:
+		os.stat(join(dir, 'waflib'))
+		return os.path.abspath(dir)
+	except OSError:
+		pass
+
+def find_lib():
+	name = sys.argv[0]
+	base = os.path.dirname(os.path.abspath(name))
+
+	#devs use $WAFDIR
+	w=test(os.environ.get('WAFDIR', ''))
+	if w: return w
+
+	#waf-light
+	if name.endswith('waf-light'):
+		w = test(base)
+		if w: return w
+		err('waf-light requires waflib -> export WAFDIR=/folder')
+
+	dirname = '%s-%s-%s' % (WAF, VERSION, REVISION)
+	for i in [INSTALL,'/usr','/usr/local','/opt']:
+		w = test(i + '/lib/' + dirname)
+		if w: return w
+
+	#waf-local
+	dir = join(base, (sys.platform != 'win32' and '.' or '') + dirname)
+	w = test(dir)
+	if w: return w
+
+	#unpack
+	unpack_wafdir(dir)
+	return dir
+
+wafdir = find_lib()
+sys.path.insert(0, wafdir)
+
+if __name__ == '__main__':
+	import waflib.extras.compat15
+	from waflib import Scripting
+	Scripting.waf_entry_point(cwd, VERSION, wafdir)
+
diff --git a/waflib/Build.py b/waflib/Build.py
new file mode 100644
index 0000000..58d781b
--- /dev/null
+++ b/waflib/Build.py
@@ -0,0 +1,731 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os,sys,errno,re,shutil
+try:import cPickle
+except:import pickle as cPickle
+from waflib import Runner,TaskGen,Utils,ConfigSet,Task,Logs,Options,Context,Errors
+import waflib.Node
+CACHE_DIR='c4che'
+CACHE_SUFFIX='_cache.py'
+INSTALL=1337
+UNINSTALL=-1337
+SAVED_ATTRS='root node_deps raw_deps task_sigs'.split()
+CFG_FILES='cfg_files'
+POST_AT_ONCE=0
+POST_LAZY=1
+POST_BOTH=2
+class BuildContext(Context.Context):
+	'''executes the build'''
+	cmd='build'
+	variant=''
+	def __init__(self,**kw):
+		super(BuildContext,self).__init__(**kw)
+		self.is_install=0
+		self.top_dir=kw.get('top_dir',Context.top_dir)
+		self.run_dir=kw.get('run_dir',Context.run_dir)
+		self.post_mode=POST_AT_ONCE
+		self.out_dir=kw.get('out_dir',Context.out_dir)
+		self.cache_dir=kw.get('cache_dir',None)
+		if not self.cache_dir:
+			self.cache_dir=self.out_dir+os.sep+CACHE_DIR
+		self.all_envs={}
+		self.task_sigs={}
+		self.node_deps={}
+		self.raw_deps={}
+		self.cache_dir_contents={}
+		self.task_gen_cache_names={}
+		self.launch_dir=Context.launch_dir
+		self.jobs=Options.options.jobs
+		self.targets=Options.options.targets
+		self.keep=Options.options.keep
+		self.cache_global=Options.cache_global
+		self.nocache=Options.options.nocache
+		self.progress_bar=Options.options.progress_bar
+		self.deps_man=Utils.defaultdict(list)
+		self.current_group=0
+		self.groups=[]
+		self.group_names={}
+	def get_variant_dir(self):
+		if not self.variant:
+			return self.out_dir
+		return os.path.join(self.out_dir,self.variant)
+	variant_dir=property(get_variant_dir,None)
+	def __call__(self,*k,**kw):
+		kw['bld']=self
+		ret=TaskGen.task_gen(*k,**kw)
+		self.task_gen_cache_names={}
+		self.add_to_group(ret,group=kw.get('group',None))
+		return ret
+	def __copy__(self):
+		raise Errors.WafError('build contexts are not supposed to be copied')
+	def install_files(self,*k,**kw):
+		pass
+	def install_as(self,*k,**kw):
+		pass
+	def symlink_as(self,*k,**kw):
+		pass
+	def load_envs(self):
+		node=self.root.find_node(self.cache_dir)
+		if not node:
+			raise Errors.WafError('The project was not configured: run "waf configure" first!')
+		lst=node.ant_glob('**/*%s'%CACHE_SUFFIX,quiet=True)
+		if not lst:
+			raise Errors.WafError('The cache directory is empty: reconfigure the project')
+		for x in lst:
+			name=x.path_from(node).replace(CACHE_SUFFIX,'').replace('\\','/')
+			env=ConfigSet.ConfigSet(x.abspath())
+			self.all_envs[name]=env
+			for f in env[CFG_FILES]:
+				newnode=self.root.find_resource(f)
+				try:
+					h=Utils.h_file(newnode.abspath())
+				except(IOError,AttributeError):
+					Logs.error('cannot find %r'%f)
+					h=Utils.SIG_NIL
+				newnode.sig=h
+	def init_dirs(self):
+		if not(os.path.isabs(self.top_dir)and os.path.isabs(self.out_dir)):
+			raise Errors.WafError('The project was not configured: run "waf configure" first!')
+		self.path=self.srcnode=self.root.find_dir(self.top_dir)
+		self.bldnode=self.root.make_node(self.variant_dir)
+		self.bldnode.mkdir()
+	def execute(self):
+		self.restore()
+		if not self.all_envs:
+			self.load_envs()
+		self.execute_build()
+	def execute_build(self):
+		Logs.info("Waf: Entering directory `%s'"%self.variant_dir)
+		self.recurse([self.run_dir])
+		self.pre_build()
+		self.timer=Utils.Timer()
+		if self.progress_bar:
+			sys.stderr.write(Logs.colors.cursor_off)
+		try:
+			self.compile()
+		finally:
+			if self.progress_bar==1:
+				c=len(self.returned_tasks)or 1
+				self.to_log(self.progress_line(c,c,Logs.colors.BLUE,Logs.colors.NORMAL))
+				print('')
+				sys.stdout.flush()
+				sys.stderr.write(Logs.colors.cursor_on)
+			Logs.info("Waf: Leaving directory `%s'"%self.variant_dir)
+		self.post_build()
+	def restore(self):
+		try:
+			env=ConfigSet.ConfigSet(os.path.join(self.cache_dir,'build.config.py'))
+		except(IOError,OSError):
+			pass
+		else:
+			if env['version']<Context.HEXVERSION:
+				raise Errors.WafError('Version mismatch! reconfigure the project')
+			for t in env['tools']:
+				self.setup(**t)
+		f=None
+		try:
+			dbfn=os.path.join(self.variant_dir,Context.DBFILE)
+			try:
+				f=open(dbfn,'rb')
+			except(IOError,EOFError):
+				Logs.debug('build: could not load the build cache %s (missing)'%dbfn)
+			else:
+				try:
+					waflib.Node.pickle_lock.acquire()
+					waflib.Node.Nod3=self.node_class
+					try:
+						data=cPickle.load(f)
+					except Exception ,e:
+						Logs.debug('build: could not pickle the build cache %s: %r'%(dbfn,e))
+					else:
+						for x in SAVED_ATTRS:
+							setattr(self,x,data[x])
+				finally:
+					waflib.Node.pickle_lock.release()
+		finally:
+			if f:
+				f.close()
+		self.init_dirs()
+	def store(self):
+		data={}
+		for x in SAVED_ATTRS:
+			data[x]=getattr(self,x)
+		db=os.path.join(self.variant_dir,Context.DBFILE)
+		try:
+			waflib.Node.pickle_lock.acquire()
+			waflib.Node.Nod3=self.node_class
+			f=None
+			try:
+				f=open(db+'.tmp','wb')
+				cPickle.dump(data,f)
+			finally:
+				if f:
+					f.close()
+		finally:
+			waflib.Node.pickle_lock.release()
+		try:
+			st=os.stat(db)
+			os.unlink(db)
+			if not Utils.is_win32:
+				os.chown(db+'.tmp',st.st_uid,st.st_gid)
+		except(AttributeError,OSError):
+			pass
+		os.rename(db+'.tmp',db)
+	def compile(self):
+		Logs.debug('build: compile()')
+		self.producer=Runner.Parallel(self,self.jobs)
+		self.producer.biter=self.get_build_iterator()
+		self.returned_tasks=[]
+		try:
+			self.producer.start()
+		except KeyboardInterrupt:
+			self.store()
+			raise
+		else:
+			if self.producer.dirty:
+				self.store()
+		if self.producer.error:
+			raise Errors.BuildError(self.producer.error)
+	def setup(self,tool,tooldir=None,funs=None):
+		if isinstance(tool,list):
+			for i in tool:self.setup(i,tooldir)
+			return
+		module=Context.load_tool(tool,tooldir)
+		if hasattr(module,"setup"):module.setup(self)
+	def get_env(self):
+		try:
+			return self.all_envs[self.variant]
+		except KeyError:
+			return self.all_envs['']
+	def set_env(self,val):
+		self.all_envs[self.variant]=val
+	env=property(get_env,set_env)
+	def add_manual_dependency(self,path,value):
+		if isinstance(path,waflib.Node.Node):
+			node=path
+		elif os.path.isabs(path):
+			node=self.root.find_resource(path)
+		else:
+			node=self.path.find_resource(path)
+		self.deps_man[id(node)].append(value)
+	def launch_node(self):
+		try:
+			return self.p_ln
+		except AttributeError:
+			self.p_ln=self.root.find_dir(self.launch_dir)
+			return self.p_ln
+	def hash_env_vars(self,env,vars_lst):
+		if not env.table:
+			env=env.parent
+			if not env:
+				return Utils.SIG_NIL
+		idx=str(id(env))+str(vars_lst)
+		try:
+			cache=self.cache_env
+		except AttributeError:
+			cache=self.cache_env={}
+		else:
+			try:
+				return self.cache_env[idx]
+			except KeyError:
+				pass
+		lst=[env[a]for a in vars_lst]
+		ret=Utils.h_list(lst)
+		Logs.debug('envhash: %s %r',Utils.to_hex(ret),lst)
+		cache[idx]=ret
+		return ret
+	def get_tgen_by_name(self,name):
+		cache=self.task_gen_cache_names
+		if not cache:
+			for g in self.groups:
+				for tg in g:
+					try:
+						cache[tg.name]=tg
+					except AttributeError:
+						pass
+		try:
+			return cache[name]
+		except KeyError:
+			raise Errors.WafError('Could not find a task generator for the name %r'%name)
+	def progress_line(self,state,total,col1,col2):
+		n=len(str(total))
+		Utils.rot_idx+=1
+		ind=Utils.rot_chr[Utils.rot_idx%4]
+		pc=(100.*state)/total
+		eta=str(self.timer)
+		fs="[%%%dd/%%%dd][%%s%%2d%%%%%%s][%s]["%(n,n,ind)
+		left=fs%(state,total,col1,pc,col2)
+		right='][%s%s%s]'%(col1,eta,col2)
+		cols=Logs.get_term_cols()-len(left)-len(right)+2*len(col1)+2*len(col2)
+		if cols<7:cols=7
+		ratio=((cols*state)//total)-1
+		bar=('='*ratio+'>').ljust(cols)
+		msg=Utils.indicator%(left,bar,right)
+		return msg
+	def declare_chain(self,*k,**kw):
+		return TaskGen.declare_chain(*k,**kw)
+	def pre_build(self):
+		for m in getattr(self,'pre_funs',[]):
+			m(self)
+	def post_build(self):
+		for m in getattr(self,'post_funs',[]):
+			m(self)
+	def add_pre_fun(self,meth):
+		try:
+			self.pre_funs.append(meth)
+		except AttributeError:
+			self.pre_funs=[meth]
+	def add_post_fun(self,meth):
+		try:
+			self.post_funs.append(meth)
+		except AttributeError:
+			self.post_funs=[meth]
+	def get_group(self,x):
+		if not self.groups:
+			self.add_group()
+		if x is None:
+			return self.groups[self.current_group]
+		if x in self.group_names:
+			return self.group_names[x]
+		return self.groups[x]
+	def add_to_group(self,tgen,group=None):
+		assert(isinstance(tgen,TaskGen.task_gen)or isinstance(tgen,Task.TaskBase))
+		tgen.bld=self
+		self.get_group(group).append(tgen)
+	def get_group_name(self,g):
+		if not isinstance(g,list):
+			g=self.groups[g]
+		for x in self.group_names:
+			if id(self.group_names[x])==id(g):
+				return x
+		return''
+	def get_group_idx(self,tg):
+		se=id(tg)
+		for i in range(len(self.groups)):
+			for t in self.groups[i]:
+				if id(t)==se:
+					return i
+		return None
+	def add_group(self,name=None,move=True):
+		if name and name in self.group_names:
+			Logs.error('add_group: name %s already present'%name)
+		g=[]
+		self.group_names[name]=g
+		self.groups.append(g)
+		if move:
+			self.current_group=len(self.groups)-1
+	def set_group(self,idx):
+		if isinstance(idx,str):
+			g=self.group_names[idx]
+			for i in range(len(self.groups)):
+				if id(g)==id(self.groups[i]):
+					self.current_group=i
+		else:
+			self.current_group=idx
+	def total(self):
+		total=0
+		for group in self.groups:
+			for tg in group:
+				try:
+					total+=len(tg.tasks)
+				except AttributeError:
+					total+=1
+		return total
+	def get_targets(self):
+		to_post=[]
+		min_grp=0
+		for name in self.targets.split(','):
+			tg=self.get_tgen_by_name(name)
+			if not tg:
+				raise Errors.WafError('target %r does not exist'%name)
+			m=self.get_group_idx(tg)
+			if m>min_grp:
+				min_grp=m
+				to_post=[tg]
+			elif m==min_grp:
+				to_post.append(tg)
+		return(min_grp,to_post)
+	def post_group(self):
+		if self.targets=='*':
+			for tg in self.groups[self.cur]:
+				try:
+					f=tg.post
+				except AttributeError:
+					pass
+				else:
+					f()
+		elif self.targets:
+			if self.cur<self._min_grp:
+				for tg in self.groups[self.cur]:
+					try:
+						f=tg.post
+					except AttributeError:
+						pass
+					else:
+						f()
+			else:
+				for tg in self._exact_tg:
+					tg.post()
+		else:
+			ln=self.launch_node()
+			for tg in self.groups[self.cur]:
+				try:
+					f=tg.post
+				except AttributeError:
+					pass
+				else:
+					if tg.path.is_child_of(ln):
+						f()
+	def get_tasks_group(self,idx):
+		tasks=[]
+		for tg in self.groups[idx]:
+			if isinstance(tg,Task.TaskBase):
+				tasks.append(tg)
+			else:
+				tasks.extend(tg.tasks)
+		return tasks
+	def get_build_iterator(self):
+		self.cur=0
+		if self.targets and self.targets!='*':
+			(self._min_grp,self._exact_tg)=self.get_targets()
+		global lazy_post
+		if self.post_mode!=POST_LAZY:
+			while self.cur<len(self.groups):
+				self.post_group()
+				self.cur+=1
+			self.cur=0
+		while self.cur<len(self.groups):
+			if self.post_mode!=POST_AT_ONCE:
+				self.post_group()
+			tasks=self.get_tasks_group(self.cur)
+			Task.set_file_constraints(tasks)
+			Task.set_precedence_constraints(tasks)
+			self.cur_tasks=tasks
+			self.cur+=1
+			if not tasks:
+				continue
+			yield tasks
+		while 1:
+			yield[]
+class inst(Task.Task):
+	color='CYAN'
+	def post(self):
+		buf=[]
+		for x in self.source:
+			if isinstance(x,waflib.Node.Node):
+				y=x
+			else:
+				y=self.path.find_resource(x)
+				if not y:
+					if Logs.verbose:
+						Logs.warn('Could not find %s immediately (may cause broken builds)'%x)
+					idx=self.generator.bld.get_group_idx(self)
+					for tg in self.generator.bld.groups[idx]:
+						if not isinstance(tg,inst)and id(tg)!=id(self):
+							tg.post()
+						y=self.path.find_resource(x)
+						if y:
+							break
+					else:
+						raise Errors.WafError('could not find %r in %r'%(x,self.path))
+			buf.append(y)
+		self.inputs=buf
+	def runnable_status(self):
+		ret=super(inst,self).runnable_status()
+		if ret==Task.SKIP_ME:
+			return Task.RUN_ME
+		return ret
+	def __str__(self):
+		return''
+	def run(self):
+		return self.generator.exec_task()
+	def get_install_path(self,destdir=True):
+		dest=Utils.subst_vars(self.dest,self.env)
+		dest=dest.replace('/',os.sep)
+		if destdir and Options.options.destdir:
+			dest=os.path.join(Options.options.destdir,os.path.splitdrive(dest)[1].lstrip(os.sep))
+		return dest
+	def exec_install_files(self):
+		destpath=self.get_install_path()
+		if not destpath:
+			raise Errors.WafError('unknown installation path %r'%self.generator)
+		for x,y in zip(self.source,self.inputs):
+			if self.relative_trick:
+				destfile=os.path.join(destpath,y.path_from(self.path))
+				Utils.check_dir(os.path.dirname(destfile))
+			else:
+				destfile=os.path.join(destpath,y.name)
+			self.generator.bld.do_install(y.abspath(),destfile,self.chmod)
+	def exec_install_as(self):
+		destfile=self.get_install_path()
+		self.generator.bld.do_install(self.inputs[0].abspath(),destfile,self.chmod)
+	def exec_symlink_as(self):
+		destfile=self.get_install_path()
+		self.generator.bld.do_link(self.link,destfile)
+class InstallContext(BuildContext):
+	'''installs the targets on the system'''
+	cmd='install'
+	def __init__(self,**kw):
+		super(InstallContext,self).__init__(**kw)
+		self.uninstall=[]
+		self.is_install=INSTALL
+	def do_install(self,src,tgt,chmod=Utils.O644):
+		d,_=os.path.split(tgt)
+		if not d:
+			raise Errors.WafError('Invalid installation given %r->%r'%(src,tgt))
+		Utils.check_dir(d)
+		srclbl=src.replace(self.srcnode.abspath()+os.sep,'')
+		if not Options.options.force:
+			try:
+				st1=os.stat(tgt)
+				st2=os.stat(src)
+			except OSError:
+				pass
+			else:
+				if st1.st_mtime+2>=st2.st_mtime and st1.st_size==st2.st_size:
+					if not self.progress_bar:
+						Logs.info('- install %s (from %s)'%(tgt,srclbl))
+					return False
+		if not self.progress_bar:
+			Logs.info('+ install %s (from %s)'%(tgt,srclbl))
+		try:
+			os.remove(tgt)
+		except OSError:
+			pass
+		try:
+			shutil.copy2(src,tgt)
+			os.chmod(tgt,chmod)
+		except IOError:
+			try:
+				os.stat(src)
+			except(OSError,IOError):
+				Logs.error('File %r does not exist'%src)
+			raise Errors.WafError('Could not install the file %r'%tgt)
+	def do_link(self,src,tgt):
+		d,_=os.path.split(tgt)
+		Utils.check_dir(d)
+		link=False
+		if not os.path.islink(tgt):
+			link=True
+		elif os.readlink(tgt)!=src:
+			link=True
+		if link:
+			try:os.remove(tgt)
+			except OSError:pass
+			if not self.progress_bar:
+				Logs.info('+ symlink %s (to %s)'%(tgt,src))
+			os.symlink(src,tgt)
+		else:
+			if not self.progress_bar:
+				Logs.info('- symlink %s (to %s)'%(tgt,src))
+	def run_task_now(self,tsk,postpone):
+		tsk.post()
+		if not postpone:
+			if tsk.runnable_status()==Task.ASK_LATER:
+				raise self.WafError('cannot post the task %r'%tsk)
+			tsk.run()
+	def install_files(self,dest,files,env=None,chmod=Utils.O644,relative_trick=False,cwd=None,add=True,postpone=True):
+		tsk=inst(env=env or self.env)
+		tsk.bld=self
+		tsk.path=cwd or self.path
+		tsk.chmod=chmod
+		if isinstance(files,waflib.Node.Node):
+			tsk.source=[files]
+		else:
+			tsk.source=Utils.to_list(files)
+		tsk.dest=dest
+		tsk.exec_task=tsk.exec_install_files
+		tsk.relative_trick=relative_trick
+		if add:self.add_to_group(tsk)
+		self.run_task_now(tsk,postpone)
+		return tsk
+	def install_as(self,dest,srcfile,env=None,chmod=Utils.O644,cwd=None,add=True,postpone=True):
+		tsk=inst(env=env or self.env)
+		tsk.bld=self
+		tsk.path=cwd or self.path
+		tsk.chmod=chmod
+		tsk.source=[srcfile]
+		tsk.dest=dest
+		tsk.exec_task=tsk.exec_install_as
+		if add:self.add_to_group(tsk)
+		self.run_task_now(tsk,postpone)
+		return tsk
+	def symlink_as(self,dest,src,env=None,cwd=None,add=True,postpone=True):
+		if Utils.is_win32:
+			return
+		tsk=inst(env=env or self.env)
+		tsk.bld=self
+		tsk.dest=dest
+		tsk.path=cwd or self.path
+		tsk.source=[]
+		tsk.link=src
+		tsk.exec_task=tsk.exec_symlink_as
+		if add:self.add_to_group(tsk)
+		self.run_task_now(tsk,postpone)
+		return tsk
+class UninstallContext(InstallContext):
+	'''removes the targets installed'''
+	cmd='uninstall'
+	def __init__(self,**kw):
+		super(UninstallContext,self).__init__(**kw)
+		self.is_install=UNINSTALL
+	def do_install(self,src,tgt,chmod=Utils.O644):
+		if not self.progress_bar:
+			Logs.info('- remove %s'%tgt)
+		self.uninstall.append(tgt)
+		try:
+			os.remove(tgt)
+		except OSError ,e:
+			if e.errno!=errno.ENOENT:
+				if not getattr(self,'uninstall_error',None):
+					self.uninstall_error=True
+					Logs.warn('build: some files could not be uninstalled (retry with -vv to list them)')
+				if Logs.verbose>1:
+					Logs.warn('could not remove %s (error code %r)'%(e.filename,e.errno))
+		while tgt:
+			tgt=os.path.dirname(tgt)
+			try:
+				os.rmdir(tgt)
+			except OSError:
+				break
+	def do_link(self,src,tgt):
+		try:
+			if not self.progress_bar:
+				Logs.info('- unlink %s'%tgt)
+			os.remove(tgt)
+		except OSError:
+			pass
+		while tgt:
+			tgt=os.path.dirname(tgt)
+			try:
+				os.rmdir(tgt)
+			except OSError:
+				break
+	def execute(self):
+		try:
+			def runnable_status(self):
+				return Task.SKIP_ME
+			setattr(Task.Task,'runnable_status_back',Task.Task.runnable_status)
+			setattr(Task.Task,'runnable_status',runnable_status)
+			super(UninstallContext,self).execute()
+		finally:
+			setattr(Task.Task,'runnable_status',Task.Task.runnable_status_back)
+class CleanContext(BuildContext):
+	'''cleans the project'''
+	cmd='clean'
+	def execute(self):
+		self.restore()
+		if not self.all_envs:
+			self.load_envs()
+		self.recurse([self.run_dir])
+		try:
+			self.clean()
+		finally:
+			self.store()
+	def clean(self):
+		Logs.debug('build: clean called')
+		if self.bldnode!=self.srcnode:
+			lst=[self.root.find_or_declare(f)for f in self.env[CFG_FILES]]
+			for n in self.bldnode.ant_glob('**/*',excl='lock* *conf_check_*/** config.log c4che/*',quiet=True):
+				if n in lst:
+					continue
+				n.delete()
+		self.root.children={}
+		for v in'node_deps task_sigs raw_deps'.split():
+			setattr(self,v,{})
+class ListContext(BuildContext):
+	'''lists the targets to execute'''
+	cmd='list'
+	def execute(self):
+		self.restore()
+		if not self.all_envs:
+			self.load_envs()
+		self.recurse([self.run_dir])
+		self.pre_build()
+		self.timer=Utils.Timer()
+		for g in self.groups:
+			for tg in g:
+				try:
+					f=tg.post
+				except AttributeError:
+					pass
+				else:
+					f()
+		try:
+			self.get_tgen_by_name('')
+		except:
+			pass
+		lst=list(self.task_gen_cache_names.keys())
+		lst.sort()
+		for k in lst:
+			Logs.pprint('GREEN',k)
+class StepContext(BuildContext):
+	'''executes tasks in a step-by-step fashion, for debugging'''
+	cmd='step'
+	def __init__(self,**kw):
+		super(StepContext,self).__init__(**kw)
+		self.files=Options.options.files
+	def compile(self):
+		if not self.files:
+			Logs.warn('Add a pattern for the debug build, for example "waf step --files=main.c,app"')
+			BuildContext.compile(self)
+			return
+		for g in self.groups:
+			for tg in g:
+				try:
+					f=tg.post
+				except AttributeError:
+					pass
+				else:
+					f()
+			for pat in self.files.split(','):
+				matcher=self.get_matcher(pat)
+				for tg in g:
+					if isinstance(tg,Task.TaskBase):
+						lst=[tg]
+					else:
+						lst=tg.tasks
+					for tsk in lst:
+						do_exec=False
+						for node in getattr(tsk,'inputs',[]):
+							if matcher(node,output=False):
+								do_exec=True
+								break
+						for node in getattr(tsk,'outputs',[]):
+							if matcher(node,output=True):
+								do_exec=True
+								break
+						if do_exec:
+							ret=tsk.run()
+							Logs.info('%s -> exit %r'%(str(tsk),ret))
+	def get_matcher(self,pat):
+		inn=True
+		out=True
+		if pat.startswith('in:'):
+			out=False
+			pat=pat.replace('in:','')
+		elif pat.startswith('out:'):
+			inn=False
+			pat=pat.replace('out:','')
+		anode=self.root.find_node(pat)
+		pattern=None
+		if not anode:
+			if not pat.startswith('^'):
+				pat='^.+?%s'%pat
+			if not pat.endswith('$'):
+				pat='%s$'%pat
+			pattern=re.compile(pat)
+		def match(node,output):
+			if output==True and not out:
+				return False
+			if output==False and not inn:
+				return False
+			if anode:
+				return anode==node
+			else:
+				return pattern.match(node.abspath())
+		return match
+BuildContext.store=Utils.nogc(BuildContext.store)
+BuildContext.restore=Utils.nogc(BuildContext.restore)
diff --git a/waflib/ConfigSet.py b/waflib/ConfigSet.py
new file mode 100644
index 0000000..fa55135
--- /dev/null
+++ b/waflib/ConfigSet.py
@@ -0,0 +1,151 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import sys
+if sys.hexversion < 0x020400f0: from sets import Set as set
+import copy,re,os
+from waflib import Logs,Utils
+re_imp=re.compile('^(#)*?([^#=]*?)\ =\ (.*?)$',re.M)
+class ConfigSet(object):
+	__slots__=('table','parent')
+	def __init__(self,filename=None):
+		self.table={}
+		if filename:
+			self.load(filename)
+	def __contains__(self,key):
+		if key in self.table:return True
+		try:return self.parent.__contains__(key)
+		except AttributeError:return False
+	def keys(self):
+		keys=set()
+		cur=self
+		while cur:
+			keys.update(cur.table.keys())
+			cur=getattr(cur,'parent',None)
+		keys=list(keys)
+		keys.sort()
+		return keys
+	def __str__(self):
+		return"\n".join(["%r %r"%(x,self.__getitem__(x))for x in self.keys()])
+	def __getitem__(self,key):
+		try:
+			while 1:
+				x=self.table.get(key,None)
+				if not x is None:
+					return x
+				self=self.parent
+		except AttributeError:
+			return[]
+	def __setitem__(self,key,value):
+		self.table[key]=value
+	def __delitem__(self,key):
+		self[key]=[]
+	def __getattr__(self,name):
+		if name in self.__slots__:
+			return object.__getattr__(self,name)
+		else:
+			return self[name]
+	def __setattr__(self,name,value):
+		if name in self.__slots__:
+			object.__setattr__(self,name,value)
+		else:
+			self[name]=value
+	def __delattr__(self,name):
+		if name in self.__slots__:
+			object.__delattr__(self,name)
+		else:
+			del self[name]
+	def derive(self):
+		newenv=ConfigSet()
+		newenv.parent=self
+		return newenv
+	def detach(self):
+		tbl=self.get_merged_dict()
+		try:
+			delattr(self,'parent')
+		except AttributeError:
+			pass
+		else:
+			keys=tbl.keys()
+			for x in keys:
+				tbl[x]=copy.deepcopy(tbl[x])
+			self.table=tbl
+	def get_flat(self,key):
+		s=self[key]
+		if isinstance(s,str):return s
+		return' '.join(s)
+	def _get_list_value_for_modification(self,key):
+		try:
+			value=self.table[key]
+		except KeyError:
+			try:value=self.parent[key]
+			except AttributeError:value=[]
+			if isinstance(value,list):
+				value=value[:]
+			else:
+				value=[value]
+		else:
+			if not isinstance(value,list):
+				value=[value]
+		self.table[key]=value
+		return value
+	def append_value(self,var,val):
+		current_value=self._get_list_value_for_modification(var)
+		if isinstance(val,str):
+			val=[val]
+		current_value.extend(val)
+	def prepend_value(self,var,val):
+		if isinstance(val,str):
+			val=[val]
+		self.table[var]=val+self._get_list_value_for_modification(var)
+	def append_unique(self,var,val):
+		if isinstance(val,str):
+			val=[val]
+		current_value=self._get_list_value_for_modification(var)
+		for x in val:
+			if x not in current_value:
+				current_value.append(x)
+	def get_merged_dict(self):
+		table_list=[]
+		env=self
+		while 1:
+			table_list.insert(0,env.table)
+			try:env=env.parent
+			except AttributeError:break
+		merged_table={}
+		for table in table_list:
+			merged_table.update(table)
+		return merged_table
+	def store(self,filename):
+		try:
+			os.makedirs(os.path.split(filename)[0])
+		except OSError:
+			pass
+		f=None
+		try:
+			f=open(filename,'w')
+			merged_table=self.get_merged_dict()
+			keys=list(merged_table.keys())
+			keys.sort()
+			for k in keys:
+				if k!='undo_stack':
+					f.write('%s = %r\n'%(k,merged_table[k]))
+		finally:
+			if f:
+				f.close()
+	def load(self,filename):
+		tbl=self.table
+		code=Utils.readf(filename)
+		for m in re_imp.finditer(code):
+			g=m.group
+			tbl[g(2)]=eval(g(3))
+		Logs.debug('env: %s'%str(self.table))
+	def update(self,d):
+		for k,v in d.items():
+			self[k]=v
+	def stash(self):
+		self.undo_stack=self.undo_stack+[self.table]
+		self.table=self.table.copy()
+	def revert(self):
+		self.table=self.undo_stack.pop(-1)
diff --git a/waflib/Configure.py b/waflib/Configure.py
new file mode 100644
index 0000000..bd004c6
--- /dev/null
+++ b/waflib/Configure.py
@@ -0,0 +1,315 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os,shlex,sys,time
+from waflib import ConfigSet,Utils,Options,Logs,Context,Build,Errors
+try:
+	from urllib import request
+except:
+	from urllib import urlopen
+else:
+	urlopen=request.urlopen
+BREAK='break'
+CONTINUE='continue'
+WAF_CONFIG_LOG='config.log'
+autoconfig=False
+conf_template='''# project %(app)s configured on %(now)s by
+# waf %(wafver)s (abi %(abi)s, python %(pyver)x on %(systype)s)
+# using %(args)s
+#'''
+def download_check(node):
+	pass
+def download_tool(tool,force=False,ctx=None):
+	for x in Utils.to_list(Context.remote_repo):
+		for sub in Utils.to_list(Context.remote_locs):
+			url='/'.join((x,sub,tool+'.py'))
+			try:
+				web=urlopen(url)
+				try:
+					if web.getcode()!=200:
+						continue
+				except AttributeError:
+					pass
+			except Exception:
+				continue
+			else:
+				tmp=ctx.root.make_node(os.sep.join((Context.waf_dir,'waflib','extras',tool+'.py')))
+				tmp.write(web.read())
+				Logs.warn('Downloaded %s from %s'%(tool,url))
+				download_check(tmp)
+				try:
+					module=Context.load_tool(tool)
+				except:
+					Logs.warn('The tool %s from %s is unusable'%(tool,url))
+					try:
+						tmp.delete()
+					except:
+						pass
+					continue
+				return module
+	raise Errors.WafError('Could not load the Waf tool')
+class ConfigurationContext(Context.Context):
+	'''configures the project'''
+	cmd='configure'
+	error_handlers=[]
+	def __init__(self,**kw):
+		super(ConfigurationContext,self).__init__(**kw)
+		self.environ=dict(os.environ)
+		self.all_envs={}
+		self.top_dir=None
+		self.out_dir=None
+		self.tools=[]
+		self.hash=0
+		self.files=[]
+		self.tool_cache=[]
+		self.setenv('')
+	def setenv(self,name,env=None):
+		if name not in self.all_envs or env:
+			if not env:
+				env=ConfigSet.ConfigSet()
+				self.prepare_env(env)
+			else:
+				env=env.derive()
+			self.all_envs[name]=env
+		self.variant=name
+	def get_env(self):
+		return self.all_envs[self.variant]
+	def set_env(self,val):
+		self.all_envs[self.variant]=val
+	env=property(get_env,set_env)
+	def init_dirs(self):
+		top=self.top_dir
+		if not top:
+			top=Options.options.top
+		if not top:
+			top=getattr(Context.g_module,Context.TOP,None)
+		if not top:
+			top=self.path.abspath()
+		top=os.path.abspath(top)
+		self.srcnode=(os.path.isabs(top)and self.root or self.path).find_dir(top)
+		assert(self.srcnode)
+		out=self.out_dir
+		if not out:
+			out=Options.options.out
+		if not out:
+			out=getattr(Context.g_module,Context.OUT,None)
+		if not out:
+			out=Options.lockfile.replace('.lock-waf_%s_'%sys.platform,'').replace('.lock-waf','')
+		self.bldnode=(os.path.isabs(out)and self.root or self.path).make_node(out)
+		self.bldnode.mkdir()
+		if not os.path.isdir(self.bldnode.abspath()):
+			conf.fatal('could not create the build directory %s'%self.bldnode.abspath())
+	def execute(self):
+		self.init_dirs()
+		self.cachedir=self.bldnode.make_node(Build.CACHE_DIR)
+		self.cachedir.mkdir()
+		path=os.path.join(self.bldnode.abspath(),WAF_CONFIG_LOG)
+		self.logger=Logs.make_logger(path,'cfg')
+		app=getattr(Context.g_module,'APPNAME','')
+		if app:
+			ver=getattr(Context.g_module,'VERSION','')
+			if ver:
+				app="%s (%s)"%(app,ver)
+		now=time.ctime()
+		pyver=sys.hexversion
+		systype=sys.platform
+		args=" ".join(sys.argv)
+		wafver=Context.WAFVERSION
+		abi=Context.ABI
+		self.to_log(conf_template%vars())
+		self.msg('Setting top to',self.srcnode.abspath())
+		self.msg('Setting out to',self.bldnode.abspath())
+		if id(self.srcnode)==id(self.bldnode):
+			Logs.warn('Setting top == out (remember to use "update_outputs")')
+		elif id(self.path)!=id(self.srcnode):
+			if self.srcnode.is_child_of(self.path):
+				Logs.warn('Are you certain that you do not want to set top="." ?')
+		super(ConfigurationContext,self).execute()
+		self.store()
+		Context.top_dir=self.srcnode.abspath()
+		Context.out_dir=self.bldnode.abspath()
+		env=ConfigSet.ConfigSet()
+		env['argv']=sys.argv
+		env['options']=Options.options.__dict__
+		env.run_dir=Context.run_dir
+		env.top_dir=Context.top_dir
+		env.out_dir=Context.out_dir
+		env['hash']=self.hash
+		env['files']=self.files
+		env['environ']=dict(self.environ)
+		if not self.env.NO_LOCK_IN_RUN:
+			env.store(Context.run_dir+os.sep+Options.lockfile)
+		if not self.env.NO_LOCK_IN_TOP:
+			env.store(Context.top_dir+os.sep+Options.lockfile)
+		if not self.env.NO_LOCK_IN_OUT:
+			env.store(Context.out_dir+os.sep+Options.lockfile)
+	def prepare_env(self,env):
+		if not env.PREFIX:
+			env.PREFIX=os.path.abspath(os.path.expanduser(Options.options.prefix))
+		if not env.BINDIR:
+			env.BINDIR=Utils.subst_vars('${PREFIX}/bin',env)
+		if not env.LIBDIR:
+			env.LIBDIR=Utils.subst_vars('${PREFIX}/lib',env)
+	def store(self):
+		n=self.cachedir.make_node('build.config.py')
+		n.write('version = 0x%x\ntools = %r\n'%(Context.HEXVERSION,self.tools))
+		if not self.all_envs:
+			self.fatal('nothing to store in the configuration context!')
+		for key in self.all_envs:
+			tmpenv=self.all_envs[key]
+			tmpenv.store(os.path.join(self.cachedir.abspath(),key+Build.CACHE_SUFFIX))
+	def load(self,input,tooldir=None,funs=None,download=True):
+		tools=Utils.to_list(input)
+		if tooldir:tooldir=Utils.to_list(tooldir)
+		for tool in tools:
+			mag=(tool,id(self.env),funs)
+			if mag in self.tool_cache:
+				self.to_log('(tool %s is already loaded, skipping)'%tool)
+				continue
+			self.tool_cache.append(mag)
+			module=None
+			try:
+				module=Context.load_tool(tool,tooldir)
+			except ImportError ,e:
+				if Options.options.download:
+					module=download_tool(tool,ctx=self)
+					if not module:
+						self.fatal('Could not load the Waf tool %r or download a suitable replacement from the repository (sys.path %r)\n%s'%(tool,sys.path,e))
+				else:
+					self.fatal('Could not load the Waf tool %r from %r (try the --download option?):\n%s'%(tool,sys.path,e))
+			except Exception ,e:
+				self.to_log('imp %r (%r & %r)'%(tool,tooldir,funs))
+				self.to_log(Utils.ex_stack())
+				raise
+			if funs is not None:
+				self.eval_rules(funs)
+			else:
+				func=getattr(module,'configure',None)
+				if func:
+					if type(func)is type(Utils.readf):func(self)
+					else:self.eval_rules(func)
+			self.tools.append({'tool':tool,'tooldir':tooldir,'funs':funs})
+	def post_recurse(self,node):
+		super(ConfigurationContext,self).post_recurse(node)
+		self.hash=hash((self.hash,node.read('rb')))
+		self.files.append(node.abspath())
+	def eval_rules(self,rules):
+		self.rules=Utils.to_list(rules)
+		for x in self.rules:
+			f=getattr(self,x)
+			if not f:self.fatal("No such method '%s'."%x)
+			try:
+				f()
+			except Exception ,e:
+				ret=self.err_handler(x,e)
+				if ret==BREAK:
+					break
+				elif ret==CONTINUE:
+					continue
+				else:
+					raise
+	def err_handler(self,fun,error):
+		pass
+def conf(f):
+	def fun(*k,**kw):
+		mandatory=True
+		if'mandatory'in kw:
+			mandatory=kw['mandatory']
+			del kw['mandatory']
+		try:
+			return f(*k,**kw)
+		except Errors.ConfigurationError ,e:
+			if mandatory:
+				raise e
+	setattr(ConfigurationContext,f.__name__,fun)
+	setattr(Build.BuildContext,f.__name__,fun)
+	return f
+def add_os_flags(self,var,dest=None):
+	try:self.env.append_value(dest or var,shlex.split(self.environ[var]))
+	except KeyError:pass
+def cmd_to_list(self,cmd):
+	if isinstance(cmd,str)and cmd.find(' '):
+		try:
+			os.stat(cmd)
+		except OSError:
+			return shlex.split(cmd)
+		else:
+			return[cmd]
+	return cmd
+def check_waf_version(self,mini='1.6.0',maxi='1.7.0'):
+	self.start_msg('Checking for waf version in %s-%s'%(str(mini),str(maxi)))
+	ver=Context.HEXVERSION
+	if Utils.num2ver(mini)>ver:
+		self.fatal('waf version should be at least %r (%r found)'%(Utils.num2ver(mini),ver))
+	if Utils.num2ver(maxi)<ver:
+		self.fatal('waf version should be at most %r (%r found)'%(Utils.num2ver(maxi),ver))
+	self.end_msg('ok')
+def find_file(self,filename,path_list=[]):
+	for n in Utils.to_list(filename):
+		for d in Utils.to_list(path_list):
+			p=os.path.join(d,n)
+			if os.path.exists(p):
+				return p
+	self.fatal('Could not find %r'%filename)
+def find_program(self,filename,**kw):
+	exts=kw.get('exts',Utils.is_win32 and'.exe,.com,.bat,.cmd'or',.sh,.pl,.py')
+	environ=kw.get('environ',os.environ)
+	ret=''
+	filename=Utils.to_list(filename)
+	var=kw.get('var','')
+	if not var:
+		var=filename[0].upper()
+	if self.env[var]:
+		ret=self.env[var]
+	elif var in environ:
+		ret=environ[var]
+	path_list=kw.get('path_list','')
+	if not ret:
+		if path_list:
+			path_list=Utils.to_list(path_list)
+		else:
+			path_list=environ.get('PATH','').split(os.pathsep)
+		if not isinstance(filename,list):
+			filename=[filename]
+		for a in exts.split(','):
+			if ret:
+				break
+			for b in filename:
+				if ret:
+					break
+				for c in path_list:
+					if ret:
+						break
+					x=os.path.expanduser(os.path.join(c,b+a))
+					if os.path.isfile(x):
+						ret=x
+	if not ret and Utils.winreg:
+		ret=Utils.get_registry_app_path(Utils.winreg.HKEY_CURRENT_USER,filename)
+	if not ret and Utils.winreg:
+		ret=Utils.get_registry_app_path(Utils.winreg.HKEY_LOCAL_MACHINE,filename)
+	self.msg('Checking for program '+','.join(filename),ret or False)
+	self.to_log('find program=%r paths=%r var=%r -> %r'%(filename,path_list,var,ret))
+	if not ret:
+		self.fatal(kw.get('errmsg','')or'Could not find the program %s'%','.join(filename))
+	if var:
+		self.env[var]=ret
+	return ret
+def find_perl_program(self,filename,path_list=[],var=None,environ=None,exts=''):
+	try:
+		app=self.find_program(filename,path_list=path_list,var=var,environ=environ,exts=exts)
+	except:
+		self.find_program('perl',var='PERL')
+		app=self.find_file(filename,os.environ['PATH'].split(os.pathsep))
+		if not app:
+			raise
+		if var:
+			self.env[var]=Utils.to_list(self.env['PERL'])+[app]
+	self.msg('Checking for %r'%filename,app)
+
+conf(add_os_flags)
+conf(cmd_to_list)
+conf(check_waf_version)
+conf(find_file)
+conf(find_program)
+conf(find_perl_program)
\ No newline at end of file
diff --git a/waflib/Context.py b/waflib/Context.py
new file mode 100644
index 0000000..a16af30
--- /dev/null
+++ b/waflib/Context.py
@@ -0,0 +1,299 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os,imp,sys
+from waflib import Utils,Errors,Logs
+import waflib.Node
+HEXVERSION=0x1060b00
+WAFVERSION="1.6.11"
+WAFREVISION="a7e69d6b81b04729804754c4d5214da063779a65"
+ABI=98
+DBFILE='.wafpickle-%d'%ABI
+APPNAME='APPNAME'
+VERSION='VERSION'
+TOP='top'
+OUT='out'
+WSCRIPT_FILE='wscript'
+launch_dir=''
+run_dir=''
+top_dir=''
+out_dir=''
+waf_dir=''
+local_repo=''
+remote_repo='http://waf.googlecode.com/git/'
+remote_locs=['waflib/extras','waflib/Tools']
+g_module=None
+STDOUT=1
+STDERR=-1
+BOTH=0
+classes=[]
+def create_context(cmd_name,*k,**kw):
+	global classes
+	for x in classes:
+		if x.cmd==cmd_name:
+			return x(*k,**kw)
+	ctx=Context(*k,**kw)
+	ctx.fun=cmd_name
+	return ctx
+class store_context(type):
+	def __init__(cls,name,bases,dict):
+		super(store_context,cls).__init__(name,bases,dict)
+		name=cls.__name__
+		if name=='ctx'or name=='Context':
+			return
+		try:
+			cls.cmd
+		except AttributeError:
+			raise Errors.WafError('Missing command for the context class %r (cmd)'%name)
+		if not getattr(cls,'fun',None):
+			cls.fun=cls.cmd
+		global classes
+		classes.insert(0,cls)
+ctx=store_context('ctx',(object,),{})
+class Context(ctx):
+	errors=Errors
+	tools={}
+	def __init__(self,**kw):
+		try:
+			rd=kw['run_dir']
+		except KeyError:
+			global run_dir
+			rd=run_dir
+		class node_class(waflib.Node.Node):
+			pass
+		self.node_class=node_class
+		self.node_class.__module__="waflib.Node"
+		self.node_class.__name__="Nod3"
+		self.node_class.ctx=self
+		self.root=self.node_class('',None)
+		self.cur_script=None
+		self.path=self.root.find_dir(rd)
+		self.stack_path=[]
+		self.exec_dict={'ctx':self,'conf':self,'bld':self,'opt':self}
+		self.logger=None
+	def __hash__(self):
+		return id(self)
+	def load(self,tool_list,*k,**kw):
+		tools=Utils.to_list(tool_list)
+		path=Utils.to_list(kw.get('tooldir',''))
+		for t in tools:
+			module=load_tool(t,path)
+			fun=getattr(module,kw.get('name',self.fun),None)
+			if fun:
+				fun(self)
+	def execute(self):
+		global g_module
+		self.recurse([os.path.dirname(g_module.root_path)])
+	def pre_recurse(self,node):
+		self.stack_path.append(self.cur_script)
+		self.cur_script=node
+		self.path=node.parent
+	def post_recurse(self,node):
+		self.cur_script=self.stack_path.pop()
+		if self.cur_script:
+			self.path=self.cur_script.parent
+	def recurse(self,dirs,name=None,mandatory=True,once=True):
+		try:
+			cache=self.recurse_cache
+		except:
+			cache=self.recurse_cache={}
+		for d in Utils.to_list(dirs):
+			if not os.path.isabs(d):
+				d=os.path.join(self.path.abspath(),d)
+			WSCRIPT=os.path.join(d,WSCRIPT_FILE)
+			WSCRIPT_FUN=WSCRIPT+'_'+(name or self.fun)
+			node=self.root.find_node(WSCRIPT_FUN)
+			if node and(not once or node not in cache):
+				cache[node]=True
+				self.pre_recurse(node)
+				try:
+					function_code=node.read('rU')
+					exec(compile(function_code,node.abspath(),'exec'),self.exec_dict)
+				finally:
+					self.post_recurse(node)
+			elif not node:
+				node=self.root.find_node(WSCRIPT)
+				tup=(node,name or self.fun)
+				if node and(not once or tup not in cache):
+					cache[tup]=True
+					self.pre_recurse(node)
+					try:
+						wscript_module=load_module(node.abspath())
+						user_function=getattr(wscript_module,(name or self.fun),None)
+						if not user_function:
+							if not mandatory:
+								continue
+							raise Errors.WafError('No function %s defined in %s'%(name or self.fun,node.abspath()))
+						user_function(self)
+					finally:
+						self.post_recurse(node)
+				elif not node:
+					if not mandatory:
+						continue
+					raise Errors.WafError('No wscript file in directory %s'%d)
+	def exec_command(self,cmd,**kw):
+		subprocess=Utils.subprocess
+		kw['shell']=isinstance(cmd,str)
+		Logs.debug('runner: %r'%cmd)
+		Logs.debug('runner_env: kw=%s'%kw)
+		try:
+			if self.logger:
+				self.logger.info(cmd)
+				kw['stdout']=kw['stderr']=subprocess.PIPE
+				p=subprocess.Popen(cmd,**kw)
+				(out,err)=p.communicate()
+				if out:
+					self.logger.debug('out: %s'%out.decode(sys.stdout.encoding or'iso8859-1'))
+				if err:
+					self.logger.error('err: %s'%err.decode(sys.stdout.encoding or'iso8859-1'))
+				return p.returncode
+			else:
+				p=subprocess.Popen(cmd,**kw)
+				return p.wait()
+		except OSError:
+			return-1
+	def cmd_and_log(self,cmd,**kw):
+		subprocess=Utils.subprocess
+		kw['shell']=isinstance(cmd,str)
+		Logs.debug('runner: %r'%cmd)
+		if'quiet'in kw:
+			quiet=kw['quiet']
+			del kw['quiet']
+		else:
+			quiet=None
+		if'output'in kw:
+			to_ret=kw['output']
+			del kw['output']
+		else:
+			to_ret=STDOUT
+		kw['stdout']=kw['stderr']=subprocess.PIPE
+		if quiet is None:
+			self.to_log(cmd)
+		try:
+			p=subprocess.Popen(cmd,**kw)
+			(out,err)=p.communicate()
+		except Exception ,e:
+			raise Errors.WafError('Execution failure: %s'%str(e),ex=e)
+		if not isinstance(out,str):
+			out=out.decode(sys.stdout.encoding or'iso8859-1')
+		if not isinstance(err,str):
+			err=err.decode(sys.stdout.encoding or'iso8859-1')
+		if out and quiet!=STDOUT and quiet!=BOTH:
+			self.to_log('out: %s'%out)
+		if err and quiet!=STDERR and quiet!=BOTH:
+			self.to_log('err: %s'%err)
+		if p.returncode:
+			e=Errors.WafError('Command %r returned %r'%(cmd,p.returncode))
+			e.returncode=p.returncode
+			e.stderr=err
+			e.stdout=out
+			raise e
+		if to_ret==BOTH:
+			return(out,err)
+		elif to_ret==STDERR:
+			return err
+		return out
+	def fatal(self,msg,ex=None):
+		if self.logger:
+			self.logger.info('from %s: %s'%(self.path.abspath(),msg))
+		try:
+			msg='%s\n(complete log in %s)'%(msg,self.logger.handlers[0].baseFilename)
+		except:
+			pass
+		raise self.errors.ConfigurationError(msg,ex=ex)
+	def to_log(self,msg):
+		if not msg:
+			return
+		if self.logger:
+			self.logger.info(msg)
+		else:
+			sys.stderr.write(str(msg))
+			sys.stderr.flush()
+	def msg(self,msg,result,color=None):
+		self.start_msg(msg)
+		if not isinstance(color,str):
+			color=result and'GREEN'or'YELLOW'
+		self.end_msg(result,color)
+	def start_msg(self,msg):
+		try:
+			if self.in_msg:
+				self.in_msg+=1
+				return
+		except:
+			self.in_msg=0
+		self.in_msg+=1
+		try:
+			self.line_just=max(self.line_just,len(msg))
+		except AttributeError:
+			self.line_just=max(40,len(msg))
+		for x in(self.line_just*'-',msg):
+			self.to_log(x)
+		Logs.pprint('NORMAL',"%s :"%msg.ljust(self.line_just),sep='')
+	def end_msg(self,result,color=None):
+		self.in_msg-=1
+		if self.in_msg:
+			return
+		defcolor='GREEN'
+		if result==True:
+			msg='ok'
+		elif result==False:
+			msg='not found'
+			defcolor='YELLOW'
+		else:
+			msg=str(result)
+		self.to_log(msg)
+		Logs.pprint(color or defcolor,msg)
+	def load_special_tools(self,var,ban=[]):
+		global waf_dir
+		lst=self.root.find_node(waf_dir).find_node('waflib/extras').ant_glob(var)
+		for x in lst:
+			if not x.name in ban:
+				load_tool(x.name.replace('.py',''))
+cache_modules={}
+def load_module(path):
+	try:
+		return cache_modules[path]
+	except KeyError:
+		pass
+	module=imp.new_module(WSCRIPT_FILE)
+	try:
+		code=Utils.readf(path,m='rU')
+	except(IOError,OSError):
+		raise Errors.WafError('Could not read the file %r'%path)
+	module_dir=os.path.dirname(path)
+	sys.path.insert(0,module_dir)
+	exec(compile(code,path,'exec'),module.__dict__)
+	sys.path.remove(module_dir)
+	cache_modules[path]=module
+	return module
+def load_tool(tool,tooldir=None):
+	tool=tool.replace('++','xx')
+	tool=tool.replace('java','javaw')
+	tool=tool.replace('compiler_cc','compiler_c')
+	if tooldir:
+		assert isinstance(tooldir,list)
+		sys.path=tooldir+sys.path
+		try:
+			__import__(tool)
+			ret=sys.modules[tool]
+			Context.tools[tool]=ret
+			return ret
+		finally:
+			for d in tooldir:
+				sys.path.remove(d)
+	else:
+		global waf_dir
+		try:
+			os.stat(os.path.join(waf_dir,'waflib','extras',tool+'.py'))
+			d='waflib.extras.%s'%tool
+		except:
+			try:
+				os.stat(os.path.join(waf_dir,'waflib','Tools',tool+'.py'))
+				d='waflib.Tools.%s'%tool
+			except:
+				d=tool
+		__import__(d)
+		ret=sys.modules[d]
+		Context.tools[tool]=ret
+		return ret
diff --git a/waflib/Errors.py b/waflib/Errors.py
new file mode 100644
index 0000000..aacc1a9
--- /dev/null
+++ b/waflib/Errors.py
@@ -0,0 +1,37 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import traceback,sys
+class WafError(Exception):
+	def __init__(self,msg='',ex=None):
+		self.msg=msg
+		assert not isinstance(msg,Exception)
+		self.stack=[]
+		if ex:
+			if not msg:
+				self.msg=str(ex)
+			if isinstance(ex,WafError):
+				self.stack=ex.stack
+			else:
+				self.stack=traceback.extract_tb(sys.exc_info()[2])
+		self.stack+=traceback.extract_stack()[:-1]
+		self.verbose_msg=''.join(traceback.format_list(self.stack))
+	def __str__(self):
+		return str(self.msg)
+class BuildError(WafError):
+	def __init__(self,error_tasks=[]):
+		self.tasks=error_tasks
+		WafError.__init__(self,self.format_error())
+	def format_error(self):
+		lst=['Build failed']
+		for tsk in self.tasks:
+			txt=tsk.format_error()
+			if txt:lst.append(txt)
+		return'\n'.join(lst)
+class ConfigurationError(WafError):
+	pass
+class TaskRescan(WafError):
+	pass
+class TaskNotReady(WafError):
+	pass
diff --git a/waflib/Logs.py b/waflib/Logs.py
new file mode 100644
index 0000000..2ba46d2
--- /dev/null
+++ b/waflib/Logs.py
@@ -0,0 +1,149 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os,re,traceback,sys
+_nocolor=os.environ.get('NOCOLOR','no')not in('no','0','false')
+try:
+	if not _nocolor:
+		import waflib.ansiterm
+except:
+	pass
+import logging
+LOG_FORMAT="%(asctime)s %(c1)s%(zone)s%(c2)s %(message)s"
+HOUR_FORMAT="%H:%M:%S"
+zones=''
+verbose=0
+colors_lst={'USE':True,'BOLD':'\x1b[01;1m','RED':'\x1b[01;31m','GREEN':'\x1b[32m','YELLOW':'\x1b[33m','PINK':'\x1b[35m','BLUE':'\x1b[01;34m','CYAN':'\x1b[36m','NORMAL':'\x1b[0m','cursor_on':'\x1b[?25h','cursor_off':'\x1b[?25l',}
+got_tty=not os.environ.get('TERM','dumb')in['dumb','emacs']
+if got_tty:
+	try:
+		got_tty=sys.stderr.isatty()
+	except AttributeError:
+		got_tty=False
+if(not got_tty and os.environ.get('TERM','dumb')!='msys')or _nocolor:
+	colors_lst['USE']=False
+def get_term_cols():
+	return 80
+try:
+	import struct,fcntl,termios
+except ImportError:
+	pass
+else:
+	if got_tty:
+		def get_term_cols_real():
+			dummy_lines,cols=struct.unpack("HHHH",fcntl.ioctl(sys.stderr.fileno(),termios.TIOCGWINSZ,struct.pack("HHHH",0,0,0,0)))[:2]
+			return cols
+		try:
+			get_term_cols_real()
+		except:
+			pass
+		else:
+			get_term_cols=get_term_cols_real
+get_term_cols.__doc__="""
+	Get the console width in characters.
+
+	:return: the number of characters per line
+	:rtype: int
+	"""
+def get_color(cl):
+	if not colors_lst['USE']:return''
+	return colors_lst.get(cl,'')
+class color_dict(object):
+	def __getattr__(self,a):
+		return get_color(a)
+	def __call__(self,a):
+		return get_color(a)
+colors=color_dict()
+re_log=re.compile(r'(\w+): (.*)',re.M)
+class log_filter(logging.Filter):
+	def __init__(self,name=None):
+		pass
+	def filter(self,rec):
+		rec.c1=colors.PINK
+		rec.c2=colors.NORMAL
+		rec.zone=rec.module
+		if rec.levelno>=logging.INFO:
+			if rec.levelno>=logging.ERROR:
+				rec.c1=colors.RED
+			elif rec.levelno>=logging.WARNING:
+				rec.c1=colors.YELLOW
+			else:
+				rec.c1=colors.GREEN
+			return True
+		m=re_log.match(rec.msg)
+		if m:
+			rec.zone=m.group(1)
+			rec.msg=m.group(2)
+		if zones:
+			return getattr(rec,'zone','')in zones or'*'in zones
+		elif not verbose>2:
+			return False
+		return True
+class formatter(logging.Formatter):
+	def __init__(self):
+		logging.Formatter.__init__(self,LOG_FORMAT,HOUR_FORMAT)
+	def format(self,rec):
+		if rec.levelno>=logging.WARNING or rec.levelno==logging.INFO:
+			try:
+				msg=rec.msg.decode('utf-8')
+			except:
+				msg=rec.msg
+			return'%s%s%s'%(rec.c1,msg,rec.c2)
+		return logging.Formatter.format(self,rec)
+log=None
+def debug(*k,**kw):
+	if verbose:
+		k=list(k)
+		k[0]=k[0].replace('\n',' ')
+		global log
+		log.debug(*k,**kw)
+def error(*k,**kw):
+	global log
+	log.error(*k,**kw)
+	if verbose>2:
+		st=traceback.extract_stack()
+		if st:
+			st=st[:-1]
+			buf=[]
+			for filename,lineno,name,line in st:
+				buf.append('  File "%s", line %d, in %s'%(filename,lineno,name))
+				if line:
+					buf.append('	%s'%line.strip())
+			if buf:log.error("\n".join(buf))
+def warn(*k,**kw):
+	global log
+	log.warn(*k,**kw)
+def info(*k,**kw):
+	global log
+	log.info(*k,**kw)
+def init_log():
+	global log
+	log=logging.getLogger('waflib')
+	log.handlers=[]
+	log.filters=[]
+	hdlr=logging.StreamHandler()
+	hdlr.setFormatter(formatter())
+	log.addHandler(hdlr)
+	log.addFilter(log_filter())
+	log.setLevel(logging.DEBUG)
+def make_logger(path,name):
+	logger=logging.getLogger(name)
+	hdlr=logging.FileHandler(path,'w')
+	formatter=logging.Formatter('%(message)s')
+	hdlr.setFormatter(formatter)
+	logger.addHandler(hdlr)
+	logger.setLevel(logging.DEBUG)
+	return logger
+def make_mem_logger(name,to_log,size=10000):
+	from logging.handlers import MemoryHandler
+	logger=logging.getLogger(name)
+	hdlr=MemoryHandler(size,target=to_log)
+	formatter=logging.Formatter('%(message)s')
+	hdlr.setFormatter(formatter)
+	logger.addHandler(hdlr)
+	logger.memhandler=hdlr
+	logger.setLevel(logging.DEBUG)
+	return logger
+def pprint(col,str,label='',sep='\n'):
+	sys.stderr.write("%s%s%s %s%s"%(colors(col),str,colors.NORMAL,label,sep))
diff --git a/waflib/Node.py b/waflib/Node.py
new file mode 100644
index 0000000..9a86b22
--- /dev/null
+++ b/waflib/Node.py
@@ -0,0 +1,506 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import sys
+if sys.hexversion < 0x020400f0: from sets import Set as set
+import os,re,sys,shutil
+from waflib import Utils,Errors
+exclude_regs='''
+**/*~
+**/#*#
+**/.#*
+**/%*%
+**/._*
+**/CVS
+**/CVS/**
+**/.cvsignore
+**/SCCS
+**/SCCS/**
+**/vssver.scc
+**/.svn
+**/.svn/**
+**/BitKeeper
+**/.git
+**/.git/**
+**/.gitignore
+**/.bzr
+**/.bzrignore
+**/.bzr/**
+**/.hg
+**/.hg/**
+**/_MTN
+**/_MTN/**
+**/.arch-ids
+**/{arch}
+**/_darcs
+**/_darcs/**
+**/.DS_Store'''
+def split_path(path):
+	return path.split('/')
+def split_path_cygwin(path):
+	if path.startswith('//'):
+		ret=path.split('/')[2:]
+		ret[0]='/'+ret[0]
+		return ret
+	return path.split('/')
+re_sp=re.compile('[/\\\\]')
+def split_path_win32(path):
+	if path.startswith('\\\\'):
+		ret=re.split(re_sp,path)[2:]
+		ret[0]='\\'+ret[0]
+		return ret
+	return re.split(re_sp,path)
+if sys.platform=='cygwin':
+	split_path=split_path_cygwin
+elif Utils.is_win32:
+	split_path=split_path_win32
+class Node(object):
+	__slots__=('name','sig','children','parent','cache_abspath','cache_isdir')
+	def __init__(self,name,parent):
+		self.name=name
+		self.parent=parent
+		if parent:
+			if name in parent.children:
+				raise Errors.WafError('node %s exists in the parent files %r already'%(name,parent))
+			parent.children[name]=self
+	def __setstate__(self,data):
+		self.name=data[0]
+		self.parent=data[1]
+		if data[2]is not None:
+			self.children=data[2]
+		if data[3]is not None:
+			self.sig=data[3]
+	def __getstate__(self):
+		return(self.name,self.parent,getattr(self,'children',None),getattr(self,'sig',None))
+	def __str__(self):
+		return self.name
+	def __repr__(self):
+		return self.abspath()
+	def __hash__(self):
+		return id(self)
+	def __eq__(self,node):
+		return id(self)==id(node)
+	def __copy__(self):
+		raise Errors.WafError('nodes are not supposed to be copied')
+	def read(self,flags='r'):
+		return Utils.readf(self.abspath(),flags)
+	def write(self,data,flags='w'):
+		f=None
+		try:
+			f=open(self.abspath(),flags)
+			f.write(data)
+		finally:
+			if f:
+				f.close()
+	def chmod(self,val):
+		os.chmod(self.abspath(),val)
+	def delete(self):
+		try:
+			if getattr(self,'children',None):
+				shutil.rmtree(self.abspath())
+			else:
+				os.unlink(self.abspath())
+		except:
+			pass
+		try:
+			delattr(self,'children')
+		except:
+			pass
+	def suffix(self):
+		k=max(0,self.name.rfind('.'))
+		return self.name[k:]
+	def height(self):
+		d=self
+		val=-1
+		while d:
+			d=d.parent
+			val+=1
+		return val
+	def listdir(self):
+		lst=Utils.listdir(self.abspath())
+		lst.sort()
+		return lst
+	def mkdir(self):
+		if getattr(self,'cache_isdir',None):
+			return
+		try:
+			self.parent.mkdir()
+		except:
+			pass
+		if self.name:
+			try:
+				os.makedirs(self.abspath())
+			except OSError:
+				pass
+			if not os.path.isdir(self.abspath()):
+				raise Errors.WafError('Could not create the directory %s'%self.abspath())
+			try:
+				self.children
+			except:
+				self.children={}
+		self.cache_isdir=True
+	def find_node(self,lst):
+		if isinstance(lst,str):
+			lst=[x for x in split_path(lst)if x and x!='.']
+		cur=self
+		for x in lst:
+			if x=='..':
+				cur=cur.parent or cur
+				continue
+			try:
+				if x in cur.children:
+					cur=cur.children[x]
+					continue
+			except:
+				cur.children={}
+			cur=self.__class__(x,cur)
+			try:
+				os.stat(cur.abspath())
+			except:
+				del cur.parent.children[x]
+				return None
+		ret=cur
+		try:
+			os.stat(ret.abspath())
+		except:
+			del ret.parent.children[ret.name]
+			return None
+		try:
+			while not getattr(cur.parent,'cache_isdir',None):
+				cur=cur.parent
+				cur.cache_isdir=True
+		except AttributeError:
+			pass
+		return ret
+	def make_node(self,lst):
+		if isinstance(lst,str):
+			lst=[x for x in split_path(lst)if x and x!='.']
+		cur=self
+		for x in lst:
+			if x=='..':
+				cur=cur.parent or cur
+				continue
+			if getattr(cur,'children',{}):
+				if x in cur.children:
+					cur=cur.children[x]
+					continue
+			else:
+				cur.children={}
+			cur=self.__class__(x,cur)
+		return cur
+	def search(self,lst):
+		if isinstance(lst,str):
+			lst=[x for x in split_path(lst)if x and x!='.']
+		cur=self
+		try:
+			for x in lst:
+				if x=='..':
+					cur=cur.parent or cur
+				else:
+					cur=cur.children[x]
+			return cur
+		except:
+			pass
+	def path_from(self,node):
+		c1=self
+		c2=node
+		c1h=c1.height()
+		c2h=c2.height()
+		lst=[]
+		up=0
+		while c1h>c2h:
+			lst.append(c1.name)
+			c1=c1.parent
+			c1h-=1
+		while c2h>c1h:
+			up+=1
+			c2=c2.parent
+			c2h-=1
+		while id(c1)!=id(c2):
+			lst.append(c1.name)
+			up+=1
+			c1=c1.parent
+			c2=c2.parent
+		for i in range(up):
+			lst.append('..')
+		lst.reverse()
+		return os.sep.join(lst)or'.'
+	def abspath(self):
+		try:
+			return self.cache_abspath
+		except:
+			pass
+		if os.sep=='/':
+			if not self.parent:
+				val=os.sep
+			elif not self.parent.name:
+				val=os.sep+self.name
+			else:
+				val=self.parent.abspath()+os.sep+self.name
+		else:
+			if not self.parent:
+				val=''
+			elif not self.parent.name:
+				val=self.name+os.sep
+			else:
+				val=self.parent.abspath().rstrip(os.sep)+os.sep+self.name
+		self.cache_abspath=val
+		return val
+	def is_child_of(self,node):
+		p=self
+		diff=self.height()-node.height()
+		while diff>0:
+			diff-=1
+			p=p.parent
+		return id(p)==id(node)
+	def ant_iter(self,accept=None,maxdepth=25,pats=[],dir=False,src=True,remove=True):
+		dircont=self.listdir()
+		dircont.sort()
+		try:
+			lst=set(self.children.keys())
+			if remove:
+				for x in lst-set(dircont):
+					del self.children[x]
+		except:
+			self.children={}
+		for name in dircont:
+			npats=accept(name,pats)
+			if npats and npats[0]:
+				accepted=[]in npats[0]
+				node=self.make_node([name])
+				isdir=os.path.isdir(node.abspath())
+				if accepted:
+					if isdir:
+						if dir:
+							yield node
+					else:
+						if src:
+							yield node
+				if getattr(node,'cache_isdir',None)or isdir:
+					node.cache_isdir=True
+					if maxdepth:
+						for k in node.ant_iter(accept=accept,maxdepth=maxdepth-1,pats=npats,dir=dir,src=src,remove=remove):
+							yield k
+		raise StopIteration
+	def ant_glob(self,*k,**kw):
+		src=kw.get('src',True)
+		dir=kw.get('dir',False)
+		excl=kw.get('excl',exclude_regs)
+		incl=k and k[0]or kw.get('incl','**')
+		def to_pat(s):
+			lst=Utils.to_list(s)
+			ret=[]
+			for x in lst:
+				x=x.replace('\\','/').replace('//','/')
+				if x.endswith('/'):
+					x+='**'
+				lst2=x.split('/')
+				accu=[]
+				for k in lst2:
+					if k=='**':
+						accu.append(k)
+					else:
+						k=k.replace('.','[.]').replace('*','.*').replace('?','.').replace('+','\\+')
+						k='^%s$'%k
+						try:
+							accu.append(re.compile(k))
+						except Exception ,e:
+							raise Errors.WafError("Invalid pattern: %s"%k,e)
+				ret.append(accu)
+			return ret
+		def filtre(name,nn):
+			ret=[]
+			for lst in nn:
+				if not lst:
+					pass
+				elif lst[0]=='**':
+					ret.append(lst)
+					if len(lst)>1:
+						if lst[1].match(name):
+							ret.append(lst[2:])
+					else:
+						ret.append([])
+				elif lst[0].match(name):
+					ret.append(lst[1:])
+			return ret
+		def accept(name,pats):
+			nacc=filtre(name,pats[0])
+			nrej=filtre(name,pats[1])
+			if[]in nrej:
+				nacc=[]
+			return[nacc,nrej]
+		ret=[x for x in self.ant_iter(accept=accept,pats=[to_pat(incl),to_pat(excl)],maxdepth=25,dir=dir,src=src,remove=kw.get('remove',True))]
+		if kw.get('flat',False):
+			return' '.join([x.path_from(self)for x in ret])
+		return ret
+	def find_nodes(self,find_dirs=True,find_files=True,match_fun=lambda x:True):
+		x="""
+		Recursively finds nodes::
+
+			def configure(cnf):
+				cnf.find_nodes()
+
+		:param find_dirs: whether to return directories
+		:param find_files: whether to return files
+		:param match_fun: matching function, taking a node as parameter
+		:rtype generator
+		:return: a generator that iterates over all the requested files
+		"""
+		files=self.listdir()
+		for f in files:
+			node=self.make_node([f])
+			if os.path.isdir(node.abspath()):
+				if find_dirs and match_fun(node):
+					yield node
+				gen=node.find_nodes(find_dirs,find_files,match_fun)
+				for g in gen:
+					yield g
+			else:
+				if find_files and match_fun(node):
+					yield node
+	def is_src(self):
+		cur=self
+		x=id(self.ctx.srcnode)
+		y=id(self.ctx.bldnode)
+		while cur.parent:
+			if id(cur)==y:
+				return False
+			if id(cur)==x:
+				return True
+			cur=cur.parent
+		return False
+	def is_bld(self):
+		cur=self
+		y=id(self.ctx.bldnode)
+		while cur.parent:
+			if id(cur)==y:
+				return True
+			cur=cur.parent
+		return False
+	def get_src(self):
+		cur=self
+		x=id(self.ctx.srcnode)
+		y=id(self.ctx.bldnode)
+		lst=[]
+		while cur.parent:
+			if id(cur)==y:
+				lst.reverse()
+				return self.ctx.srcnode.make_node(lst)
+			if id(cur)==x:
+				return self
+			lst.append(cur.name)
+			cur=cur.parent
+		return self
+	def get_bld(self):
+		cur=self
+		x=id(self.ctx.srcnode)
+		y=id(self.ctx.bldnode)
+		lst=[]
+		while cur.parent:
+			if id(cur)==y:
+				return self
+			if id(cur)==x:
+				lst.reverse()
+				return self.ctx.bldnode.make_node(lst)
+			lst.append(cur.name)
+			cur=cur.parent
+		lst.reverse()
+		if lst and Utils.is_win32 and len(lst[0])==2 and lst[0].endswith(':'):
+			lst[0]=lst[0][0]
+		return self.ctx.bldnode.make_node(['__root__']+lst)
+	def find_resource(self,lst):
+		if isinstance(lst,str):
+			lst=[x for x in split_path(lst)if x and x!='.']
+		node=self.get_bld().search(lst)
+		if not node:
+			self=self.get_src()
+			node=self.find_node(lst)
+		try:
+			pat=node.abspath()
+			if os.path.isdir(pat):
+				return None
+		except:
+			pass
+		return node
+	def find_or_declare(self,lst):
+		if isinstance(lst,str):
+			lst=[x for x in split_path(lst)if x and x!='.']
+		node=self.get_bld().search(lst)
+		if node:
+			if not os.path.isfile(node.abspath()):
+				node.sig=None
+				try:
+					node.parent.mkdir()
+				except:
+					pass
+			return node
+		self=self.get_src()
+		node=self.find_node(lst)
+		if node:
+			if not os.path.isfile(node.abspath()):
+				node.sig=None
+				try:
+					node.parent.mkdir()
+				except:
+					pass
+			return node
+		node=self.get_bld().make_node(lst)
+		node.parent.mkdir()
+		return node
+	def find_dir(self,lst):
+		if isinstance(lst,str):
+			lst=[x for x in split_path(lst)if x and x!='.']
+		node=self.find_node(lst)
+		try:
+			if not os.path.isdir(node.abspath()):
+				return None
+		except(OSError,AttributeError):
+			return None
+		return node
+	def change_ext(self,ext,ext_in=None):
+		name=self.name
+		if ext_in is None:
+			k=name.rfind('.')
+			if k>=0:
+				name=name[:k]+ext
+			else:
+				name=name+ext
+		else:
+			name=name[:-len(ext_in)]+ext
+		return self.parent.find_or_declare([name])
+	def nice_path(self,env=None):
+		return self.path_from(self.ctx.launch_node())
+	def bldpath(self):
+		return self.path_from(self.ctx.bldnode)
+	def srcpath(self):
+		return self.path_from(self.ctx.srcnode)
+	def relpath(self):
+		cur=self
+		x=id(self.ctx.bldnode)
+		while cur.parent:
+			if id(cur)==x:
+				return self.bldpath()
+			cur=cur.parent
+		return self.srcpath()
+	def bld_dir(self):
+		return self.parent.bldpath()
+	def bld_base(self):
+		s=os.path.splitext(self.name)[0]
+		return self.bld_dir()+os.sep+s
+	def get_bld_sig(self):
+		try:
+			ret=self.ctx.hash_cache[id(self)]
+		except KeyError:
+			pass
+		except AttributeError:
+			self.ctx.hash_cache={}
+		else:
+			return ret
+		if not self.is_bld()or self.ctx.bldnode is self.ctx.srcnode:
+			self.sig=Utils.h_file(self.abspath())
+		self.ctx.hash_cache[id(self)]=ret=self.sig
+		return ret
+pickle_lock=Utils.threading.Lock()
+class Nod3(Node):
+	pass
diff --git a/waflib/Options.py b/waflib/Options.py
new file mode 100644
index 0000000..2149b1b
--- /dev/null
+++ b/waflib/Options.py
@@ -0,0 +1,134 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os,tempfile,optparse,sys,re
+from waflib import Logs,Utils,Context
+cmds='distclean configure build install clean uninstall check dist distcheck'.split()
+options={}
+commands=[]
+lockfile=os.environ.get('WAFLOCK','.lock-waf_%s_build'%sys.platform)
+try:cache_global=os.path.abspath(os.environ['WAFCACHE'])
+except KeyError:cache_global=''
+platform=Utils.unversioned_sys_platform()
+class opt_parser(optparse.OptionParser):
+	def __init__(self,ctx):
+		optparse.OptionParser.__init__(self,conflict_handler="resolve",version='waf %s (%s)'%(Context.WAFVERSION,Context.WAFREVISION))
+		self.formatter.width=Logs.get_term_cols()
+		p=self.add_option
+		self.ctx=ctx
+		jobs=ctx.jobs()
+		p('-j','--jobs',dest='jobs',default=jobs,type='int',help='amount of parallel jobs (%r)'%jobs)
+		p('-k','--keep',dest='keep',default=0,action='count',help='keep running happily even if errors are found')
+		p('-v','--verbose',dest='verbose',default=0,action='count',help='verbosity level -v -vv or -vvv [default: 0]')
+		p('--nocache',dest='nocache',default=False,action='store_true',help='ignore the WAFCACHE (if set)')
+		p('--zones',dest='zones',default='',action='store',help='debugging zones (task_gen, deps, tasks, etc)')
+		gr=optparse.OptionGroup(self,'configure options')
+		self.add_option_group(gr)
+		gr.add_option('-o','--out',action='store',default='',help='build dir for the project',dest='out')
+		gr.add_option('-t','--top',action='store',default='',help='src dir for the project',dest='top')
+		default_prefix=os.environ.get('PREFIX')
+		if not default_prefix:
+			if platform=='win32':
+				d=tempfile.gettempdir()
+				default_prefix=d[0].upper()+d[1:]
+			else:
+				default_prefix='/usr/local/'
+		gr.add_option('--prefix',dest='prefix',default=default_prefix,help='installation prefix [default: %r]'%default_prefix)
+		gr.add_option('--download',dest='download',default=False,action='store_true',help='try to download the tools if missing')
+		gr=optparse.OptionGroup(self,'build and install options')
+		self.add_option_group(gr)
+		gr.add_option('-p','--progress',dest='progress_bar',default=0,action='count',help='-p: progress bar; -pp: ide output')
+		gr.add_option('--targets',dest='targets',default='',action='store',help='task generators, e.g. "target1,target2"')
+		gr=optparse.OptionGroup(self,'step options')
+		self.add_option_group(gr)
+		gr.add_option('--files',dest='files',default='',action='store',help='files to process, by regexp, e.g. "*/main.c,*/test/main.o"')
+		default_destdir=os.environ.get('DESTDIR','')
+		gr=optparse.OptionGroup(self,'install/uninstall options')
+		self.add_option_group(gr)
+		gr.add_option('--destdir',help='installation root [default: %r]'%default_destdir,default=default_destdir,dest='destdir')
+		gr.add_option('-f','--force',dest='force',default=False,action='store_true',help='force file installation')
+	def get_usage(self):
+		cmds_str={}
+		for cls in Context.classes:
+			if not cls.cmd or cls.cmd=='options':
+				continue
+			s=cls.__doc__ or''
+			cmds_str[cls.cmd]=s
+		if Context.g_module:
+			for(k,v)in Context.g_module.__dict__.items():
+				if k in['options','init','shutdown']:
+					continue
+				if type(v)is type(Context.create_context):
+					if v.__doc__ and not k.startswith('_'):
+						cmds_str[k]=v.__doc__
+		just=0
+		for k in cmds_str:
+			just=max(just,len(k))
+		lst=['  %s: %s'%(k.ljust(just),v)for(k,v)in cmds_str.items()]
+		lst.sort()
+		ret='\n'.join(lst)
+		return'''waf [commands] [options]
+
+Main commands (example: ./waf build -j4)
+%s
+'''%ret
+class OptionsContext(Context.Context):
+	cmd='options'
+	fun='options'
+	def __init__(self,**kw):
+		super(OptionsContext,self).__init__(**kw)
+		self.parser=opt_parser(self)
+		self.option_groups={}
+	def jobs(self):
+		count=int(os.environ.get('JOBS',0))
+		if count<1:
+			if'NUMBER_OF_PROCESSORS'in os.environ:
+				count=int(os.environ.get('NUMBER_OF_PROCESSORS',1))
+			else:
+				if hasattr(os,'sysconf_names'):
+					if'SC_NPROCESSORS_ONLN'in os.sysconf_names:
+						count=int(os.sysconf('SC_NPROCESSORS_ONLN'))
+					elif'SC_NPROCESSORS_CONF'in os.sysconf_names:
+						count=int(os.sysconf('SC_NPROCESSORS_CONF'))
+				if not count and os.name not in('nt','java'):
+					try:
+						tmp=self.cmd_and_log(['sysctl','-n','hw.ncpu'],quiet=0)
+					except Exception:
+						pass
+					else:
+						if re.match('^[0-9]+$',tmp):
+							count=int(tmp)
+		if count<1:
+			count=1
+		elif count>1024:
+			count=1024
+		return count
+	def add_option(self,*k,**kw):
+		self.parser.add_option(*k,**kw)
+	def add_option_group(self,*k,**kw):
+		try:
+			gr=self.option_groups[k[0]]
+		except:
+			gr=self.parser.add_option_group(*k,**kw)
+		self.option_groups[k[0]]=gr
+		return gr
+	def get_option_group(self,opt_str):
+		try:
+			return self.option_groups[opt_str]
+		except KeyError:
+			for group in self.parser.option_groups:
+				if group.title==opt_str:
+					return group
+			return None
+	def parse_args(self,_args=None):
+		global options,commands
+		(options,leftover_args)=self.parser.parse_args(args=_args)
+		commands=leftover_args
+		if options.destdir:
+			options.destdir=os.path.abspath(os.path.expanduser(options.destdir))
+		if options.verbose>=1:
+			self.load('errcheck')
+	def execute(self):
+		super(OptionsContext,self).execute()
+		self.parse_args()
diff --git a/waflib/Runner.py b/waflib/Runner.py
new file mode 100644
index 0000000..6f64fed
--- /dev/null
+++ b/waflib/Runner.py
@@ -0,0 +1,197 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import random,atexit
+try:
+	from queue import Queue
+except:
+	from Queue import Queue
+from waflib import Utils,Task,Errors,Logs
+GAP=10
+class TaskConsumer(Utils.threading.Thread):
+	def __init__(self):
+		Utils.threading.Thread.__init__(self)
+		self.ready=Queue()
+		self.setDaemon(1)
+		self.start()
+	def run(self):
+		try:
+			self.loop()
+		except:
+			pass
+	def loop(self):
+		while 1:
+			tsk=self.ready.get()
+			if not isinstance(tsk,Task.TaskBase):
+				tsk(self)
+			else:
+				tsk.process()
+pool=Queue()
+def get_pool():
+	try:
+		return pool.get(False)
+	except:
+		return TaskConsumer()
+def put_pool(x):
+	pool.put(x)
+def _free_resources():
+	global pool
+	lst=[]
+	while pool.qsize():
+		lst.append(pool.get())
+	for x in lst:
+		x.ready.put(None)
+	for x in lst:
+		x.join()
+	pool=None
+atexit.register(_free_resources)
+class Parallel(object):
+	def __init__(self,bld,j=2):
+		self.numjobs=j
+		self.bld=bld
+		self.outstanding=[]
+		self.frozen=[]
+		self.out=Queue(0)
+		self.count=0
+		self.processed=1
+		self.stop=False
+		self.error=[]
+		self.biter=None
+		self.dirty=False
+	def get_next_task(self):
+		if not self.outstanding:
+			return None
+		return self.outstanding.pop(0)
+	def postpone(self,tsk):
+		if random.randint(0,1):
+			self.frozen.insert(0,tsk)
+		else:
+			self.frozen.append(tsk)
+	def refill_task_list(self):
+		while self.count>self.numjobs*GAP:
+			self.get_out()
+		while not self.outstanding:
+			if self.count:
+				self.get_out()
+			elif self.frozen:
+				try:
+					cond=self.deadlock==self.processed
+				except:
+					pass
+				else:
+					if cond:
+						msg='check the build order for the tasks'
+						for tsk in self.frozen:
+							if not tsk.run_after:
+								msg='check the methods runnable_status'
+								break
+						lst=[]
+						for tsk in self.frozen:
+							lst.append('%s\t-> %r'%(repr(tsk),[id(x)for x in tsk.run_after]))
+						raise Errors.WafError('Deadlock detected: %s%s'%(msg,''.join(lst)))
+				self.deadlock=self.processed
+			if self.frozen:
+				self.outstanding+=self.frozen
+				self.frozen=[]
+			elif not self.count:
+				self.outstanding.extend(self.biter.next())
+				self.total=self.bld.total()
+				break
+	def add_more_tasks(self,tsk):
+		if getattr(tsk,'more_tasks',None):
+			self.outstanding+=tsk.more_tasks
+			self.total+=len(tsk.more_tasks)
+	def get_out(self):
+		tsk=self.out.get()
+		if not self.stop:
+			self.add_more_tasks(tsk)
+		self.count-=1
+		self.dirty=True
+		return tsk
+	def error_handler(self,tsk):
+		if not self.bld.keep:
+			self.stop=True
+		self.error.append(tsk)
+	def add_task(self,tsk):
+		try:
+			self.pool
+		except AttributeError:
+			self.init_task_pool()
+		self.ready.put(tsk)
+	def init_task_pool(self):
+		pool=self.pool=[get_pool()for i in range(self.numjobs)]
+		self.ready=Queue(0)
+		def setq(consumer):
+			consumer.ready=self.ready
+		for x in pool:
+			x.ready.put(setq)
+		return pool
+	def free_task_pool(self):
+		def setq(consumer):
+			consumer.ready=Queue(0)
+			self.out.put(self)
+		try:
+			pool=self.pool
+		except:
+			pass
+		else:
+			for x in pool:
+				self.ready.put(setq)
+			for x in pool:
+				self.get_out()
+			for x in pool:
+				put_pool(x)
+			self.pool=[]
+	def start(self):
+		self.total=self.bld.total()
+		while not self.stop:
+			self.refill_task_list()
+			tsk=self.get_next_task()
+			if not tsk:
+				if self.count:
+					continue
+				else:
+					break
+			if tsk.hasrun:
+				self.processed+=1
+				continue
+			if self.stop:
+				break
+			try:
+				st=tsk.runnable_status()
+			except Exception:
+				self.processed+=1
+				tsk.err_msg=Utils.ex_stack()
+				if not self.stop and self.bld.keep:
+					tsk.hasrun=Task.SKIPPED
+					if self.bld.keep==1:
+						if Logs.verbose>1 or not self.error:
+							self.error.append(tsk)
+						self.stop=True
+					else:
+						if Logs.verbose>1:
+							self.error.append(tsk)
+					continue
+				tsk.hasrun=Task.EXCEPTION
+				self.error_handler(tsk)
+				continue
+			if st==Task.ASK_LATER:
+				self.postpone(tsk)
+			elif st==Task.SKIP_ME:
+				self.processed+=1
+				tsk.hasrun=Task.SKIPPED
+				self.add_more_tasks(tsk)
+			else:
+				tsk.position=(self.processed,self.total)
+				self.count+=1
+				tsk.master=self
+				self.processed+=1
+				if self.numjobs==1:
+					tsk.process()
+				else:
+					self.add_task(tsk)
+		while self.error and self.count:
+			self.get_out()
+		assert(self.count==0 or self.stop)
+		self.free_task_pool()
diff --git a/waflib/Scripting.py b/waflib/Scripting.py
new file mode 100644
index 0000000..9a5d2e9
--- /dev/null
+++ b/waflib/Scripting.py
@@ -0,0 +1,367 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os,shutil,traceback,errno,sys,stat
+from waflib import Utils,Configure,Logs,Options,ConfigSet,Context,Errors,Build,Node
+build_dir_override=None
+no_climb_commands=['configure']
+default_cmd="build"
+def waf_entry_point(current_directory,version,wafdir):
+	Logs.init_log()
+	if Context.WAFVERSION!=version:
+		Logs.error('Waf script %r and library %r do not match (directory %r)'%(version,Context.WAFVERSION,wafdir))
+		sys.exit(1)
+	if'--version'in sys.argv:
+		Context.run_dir=current_directory
+		ctx=Context.create_context('options')
+		ctx.curdir=current_directory
+		ctx.parse_args()
+		sys.exit(0)
+	Context.waf_dir=wafdir
+	Context.launch_dir=current_directory
+	no_climb=os.environ.get('NOCLIMB',None)
+	if not no_climb:
+		for k in no_climb_commands:
+			if k in sys.argv:
+				no_climb=True
+				break
+	cur=current_directory
+	while cur:
+		lst=os.listdir(cur)
+		if Options.lockfile in lst:
+			env=ConfigSet.ConfigSet()
+			try:
+				env.load(os.path.join(cur,Options.lockfile))
+				ino=os.stat(cur)[stat.ST_INO]
+			except Exception:
+				pass
+			else:
+				for x in[env.run_dir,env.top_dir,env.out_dir]:
+					if Utils.is_win32:
+						if cur==x:
+							load=True
+							break
+					else:
+						try:
+							ino2=os.stat(x)[stat.ST_INO]
+						except:
+							pass
+						else:
+							if ino==ino2:
+								load=True
+								break
+				else:
+					Logs.warn('invalid lock file in %s'%cur)
+					load=False
+				if load:
+					Context.run_dir=env.run_dir
+					Context.top_dir=env.top_dir
+					Context.out_dir=env.out_dir
+					break
+		if not Context.run_dir:
+			if Context.WSCRIPT_FILE in lst:
+				Context.run_dir=cur
+		next=os.path.dirname(cur)
+		if next==cur:
+			break
+		cur=next
+		if no_climb:
+			break
+	if not Context.run_dir:
+		if'-h'in sys.argv or'--help'in sys.argv:
+			Logs.warn('No wscript file found: the help message may be incomplete')
+			Context.run_dir=current_directory
+			ctx=Context.create_context('options')
+			ctx.curdir=current_directory
+			ctx.parse_args()
+			sys.exit(0)
+		Logs.error('Waf: Run from a directory containing a file named %r'%Context.WSCRIPT_FILE)
+		sys.exit(1)
+	try:
+		os.chdir(Context.run_dir)
+	except OSError:
+		Logs.error('Waf: The folder %r is unreadable'%Context.run_dir)
+		sys.exit(1)
+	try:
+		set_main_module(Context.run_dir+os.sep+Context.WSCRIPT_FILE)
+	except Errors.WafError ,e:
+		Logs.pprint('RED',e.verbose_msg)
+		Logs.error(str(e))
+		sys.exit(1)
+	except Exception ,e:
+		Logs.error('Waf: The wscript in %r is unreadable'%Context.run_dir,e)
+		traceback.print_exc(file=sys.stdout)
+		sys.exit(2)
+	try:
+		run_commands()
+	except Errors.WafError ,e:
+		if Logs.verbose>1:
+			Logs.pprint('RED',e.verbose_msg)
+		Logs.error(e.msg)
+		sys.exit(1)
+	except Exception ,e:
+		traceback.print_exc(file=sys.stdout)
+		sys.exit(2)
+	except KeyboardInterrupt:
+		Logs.pprint('RED','Interrupted')
+		sys.exit(68)
+def set_main_module(file_path):
+	Context.g_module=Context.load_module(file_path)
+	Context.g_module.root_path=file_path
+	def set_def(obj):
+		name=obj.__name__
+		if not name in Context.g_module.__dict__:
+			setattr(Context.g_module,name,obj)
+	for k in[update,dist,distclean,distcheck,update]:
+		set_def(k)
+	if not'init'in Context.g_module.__dict__:
+		Context.g_module.init=Utils.nada
+	if not'shutdown'in Context.g_module.__dict__:
+		Context.g_module.shutdown=Utils.nada
+	if not'options'in Context.g_module.__dict__:
+		Context.g_module.options=Utils.nada
+def parse_options():
+	Context.create_context('options').execute()
+	if not Options.commands:
+		Options.commands=[default_cmd]
+	Options.commands=[x for x in Options.commands if x!='options']
+	Logs.verbose=Options.options.verbose
+	Logs.init_log()
+	if Options.options.zones:
+		Logs.zones=Options.options.zones.split(',')
+		if not Logs.verbose:
+			Logs.verbose=1
+	elif Logs.verbose>0:
+		Logs.zones=['runner']
+	if Logs.verbose>2:
+		Logs.zones=['*']
+def run_command(cmd_name):
+	ctx=Context.create_context(cmd_name)
+	ctx.options=Options.options
+	ctx.cmd=cmd_name
+	ctx.execute()
+	return ctx
+def run_commands():
+	parse_options()
+	run_command('init')
+	while Options.commands:
+		cmd_name=Options.commands.pop(0)
+		timer=Utils.Timer()
+		run_command(cmd_name)
+		if not Options.options.progress_bar:
+			elapsed=' (%s)'%str(timer)
+			Logs.info('%r finished successfully%s'%(cmd_name,elapsed))
+	run_command('shutdown')
+def _can_distclean(name):
+	for k in'.o .moc .exe'.split():
+		if name.endswith(k):
+			return True
+	return False
+def distclean_dir(dirname):
+	for(root,dirs,files)in os.walk(dirname):
+		for f in files:
+			if _can_distclean(f):
+				fname=root+os.sep+f
+				try:
+					os.unlink(fname)
+				except:
+					Logs.warn('could not remove %r'%fname)
+	for x in[Context.DBFILE,'config.log']:
+		try:
+			os.unlink(x)
+		except:
+			pass
+	try:
+		shutil.rmtree('c4che')
+	except:
+		pass
+def distclean(ctx):
+	'''removes the build directory'''
+	lst=os.listdir('.')
+	for f in lst:
+		if f==Options.lockfile:
+			try:
+				proj=ConfigSet.ConfigSet(f)
+			except:
+				Logs.warn('could not read %r'%f)
+				continue
+			if proj['out_dir']!=proj['top_dir']:
+				try:
+					shutil.rmtree(proj['out_dir'])
+				except IOError:
+					pass
+				except OSError ,e:
+					if e.errno!=errno.ENOENT:
+						Logs.warn('project %r cannot be removed'%proj[Context.OUT])
+			else:
+				distclean_dir(proj['out_dir'])
+			for k in(proj['out_dir'],proj['top_dir'],proj['run_dir']):
+				try:
+					os.remove(os.path.join(k,Options.lockfile))
+				except OSError ,e:
+					if e.errno!=errno.ENOENT:
+						Logs.warn('file %r cannot be removed'%f)
+		if f.startswith('.waf')and not Options.commands:
+			shutil.rmtree(f,ignore_errors=True)
+class Dist(Context.Context):
+	cmd='dist'
+	fun='dist'
+	algo='tar.bz2'
+	ext_algo={}
+	def execute(self):
+		self.recurse([os.path.dirname(Context.g_module.root_path)])
+		self.archive()
+	def archive(self):
+		import tarfile
+		arch_name=self.get_arch_name()
+		try:
+			self.base_path
+		except:
+			self.base_path=self.path
+		node=self.base_path.make_node(arch_name)
+		try:
+			node.delete()
+		except:
+			pass
+		files=self.get_files()
+		if self.algo.startswith('tar.'):
+			tar=tarfile.open(arch_name,'w:'+self.algo.replace('tar.',''))
+			for x in files:
+				self.add_tar_file(x,tar)
+			tar.close()
+		elif self.algo=='zip':
+			import zipfile
+			zip=zipfile.ZipFile(arch_name,'w',compression=zipfile.ZIP_DEFLATED)
+			for x in files:
+				archive_name=self.get_base_name()+'/'+x.path_from(self.base_path)
+				zip.write(x.abspath(),archive_name,zipfile.ZIP_DEFLATED)
+			zip.close()
+		else:
+			self.fatal('Valid algo types are tar.bz2, tar.gz or zip')
+		try:
+			from hashlib import sha1 as sha
+		except ImportError:
+			from sha import sha
+		try:
+			digest=" (sha=%r)"%sha(node.read()).hexdigest()
+		except:
+			digest=''
+		Logs.info('New archive created: %s%s'%(self.arch_name,digest))
+	def get_tar_path(self,node):
+		return node.abspath()
+	def add_tar_file(self,x,tar):
+		p=self.get_tar_path(x)
+		tinfo=tar.gettarinfo(name=p,arcname=self.get_tar_prefix()+'/'+x.path_from(self.base_path))
+		tinfo.uid=0
+		tinfo.gid=0
+		tinfo.uname='root'
+		tinfo.gname='root'
+		fu=None
+		try:
+			fu=open(p,'rb')
+			tar.addfile(tinfo,fileobj=fu)
+		finally:
+			if fu:
+				fu.close()
+	def get_tar_prefix(self):
+		try:
+			return self.tar_prefix
+		except:
+			return self.get_base_name()
+	def get_arch_name(self):
+		try:
+			self.arch_name
+		except:
+			self.arch_name=self.get_base_name()+'.'+self.ext_algo.get(self.algo,self.algo)
+		return self.arch_name
+	def get_base_name(self):
+		try:
+			self.base_name
+		except:
+			appname=getattr(Context.g_module,Context.APPNAME,'noname')
+			version=getattr(Context.g_module,Context.VERSION,'1.0')
+			self.base_name=appname+'-'+version
+		return self.base_name
+	def get_excl(self):
+		try:
+			return self.excl
+		except:
+			self.excl=Node.exclude_regs+' **/waf-1.6.* **/.waf-1.6* **/waf3-1.6.* **/.waf3-1.6* **/*~ **/*.rej **/*.orig **/*.pyc **/*.pyo **/*.bak **/*.swp **/.lock-w*'
+			nd=self.root.find_node(Context.out_dir)
+			if nd:
+				self.excl+=' '+nd.path_from(self.base_path)
+			return self.excl
+	def get_files(self):
+		try:
+			files=self.files
+		except:
+			files=self.base_path.ant_glob('**/*',excl=self.get_excl())
+		return files
+def dist(ctx):
+	'''makes a tarball for redistributing the sources'''
+	pass
+class DistCheck(Dist):
+	fun='distcheck'
+	cmd='distcheck'
+	def execute(self):
+		self.recurse([os.path.dirname(Context.g_module.root_path)])
+		self.archive()
+		self.check()
+	def check(self):
+		import tempfile,tarfile
+		t=None
+		try:
+			t=tarfile.open(self.get_arch_name())
+			for x in t:
+				t.extract(x)
+		finally:
+			if t:
+				t.close()
+		instdir=tempfile.mkdtemp('.inst',self.get_base_name())
+		ret=Utils.subprocess.Popen([sys.argv[0],'configure','install','uninstall','--destdir='+instdir],cwd=self.get_base_name()).wait()
+		if ret:
+			raise Errors.WafError('distcheck failed with code %i'%ret)
+		if os.path.exists(instdir):
+			raise Errors.WafError('distcheck succeeded, but files were left in %s'%instdir)
+		shutil.rmtree(self.get_base_name())
+def distcheck(ctx):
+	'''checks if the project compiles (tarball from 'dist')'''
+	pass
+def update(ctx):
+	'''updates the plugins from the *waflib/extras* directory'''
+	lst=Options.options.files.split(',')
+	if not lst:
+		lst=[x for x in Utils.listdir(Context.waf_dir+'/waflib/extras')if x.endswith('.py')]
+	for x in lst:
+		tool=x.replace('.py','')
+		try:
+			Configure.download_tool(tool,force=True,ctx=ctx)
+		except Errors.WafError:
+			Logs.error('Could not find the tool %s in the remote repository'%x)
+def autoconfigure(execute_method):
+	def execute(self):
+		if not Configure.autoconfig:
+			return execute_method(self)
+		env=ConfigSet.ConfigSet()
+		do_config=False
+		try:
+			env.load(os.path.join(Context.top_dir,Options.lockfile))
+		except Exception:
+			Logs.warn('Configuring the project')
+			do_config=True
+		else:
+			if env.run_dir!=Context.run_dir:
+				do_config=True
+			else:
+				h=0
+				for f in env['files']:
+					h=hash((h,Utils.readf(f,'rb')))
+				do_config=h!=env.hash
+		if do_config:
+			Options.commands.insert(0,self.cmd)
+			Options.commands.insert(0,'configure')
+			return
+		return execute_method(self)
+	return execute
+Build.BuildContext.execute=autoconfigure(Build.BuildContext.execute)
diff --git a/waflib/Task.py b/waflib/Task.py
new file mode 100644
index 0000000..1678a10
--- /dev/null
+++ b/waflib/Task.py
@@ -0,0 +1,672 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import sys
+if sys.hexversion < 0x020400f0: from sets import Set as set
+import os,shutil,re,tempfile
+from waflib import Utils,Logs,Errors
+NOT_RUN=0
+MISSING=1
+CRASHED=2
+EXCEPTION=3
+SKIPPED=8
+SUCCESS=9
+ASK_LATER=-1
+SKIP_ME=-2
+RUN_ME=-3
+COMPILE_TEMPLATE_SHELL='''
+def f(tsk):
+	env = tsk.env
+	gen = tsk.generator
+	bld = gen.bld
+	wd = getattr(tsk, 'cwd', None)
+	p = env.get_flat
+	tsk.last_cmd = cmd = \'\'\' %s \'\'\' % s
+	return tsk.exec_command(cmd, cwd=wd, env=env.env or None)
+'''
+COMPILE_TEMPLATE_NOSHELL='''
+def f(tsk):
+	env = tsk.env
+	gen = tsk.generator
+	bld = gen.bld
+	wd = getattr(tsk, 'cwd', None)
+	def to_list(xx):
+		if isinstance(xx, str): return [xx]
+		return xx
+	tsk.last_cmd = lst = []
+	%s
+	lst = [x for x in lst if x]
+	return tsk.exec_command(lst, cwd=wd, env=env.env or None)
+'''
+def cache_outputs(cls):
+	m1=cls.run
+	def run(self):
+		bld=self.generator.bld
+		if bld.cache_global and not bld.nocache:
+			if self.can_retrieve_cache():
+				return 0
+		return m1(self)
+	cls.run=run
+	m2=cls.post_run
+	def post_run(self):
+		bld=self.generator.bld
+		ret=m2(self)
+		if bld.cache_global and not bld.nocache:
+			self.put_files_cache()
+		return ret
+	cls.post_run=post_run
+	return cls
+classes={}
+class store_task_type(type):
+	def __init__(cls,name,bases,dict):
+		super(store_task_type,cls).__init__(name,bases,dict)
+		name=cls.__name__
+		if name.endswith('_task'):
+			name=name.replace('_task','')
+		if name!='evil'and name!='TaskBase':
+			global classes
+			if getattr(cls,'run_str',None):
+				(f,dvars)=compile_fun(cls.run_str,cls.shell)
+				cls.hcode=cls.run_str
+				cls.run_str=None
+				cls.run=f
+				cls.vars=list(set(cls.vars+dvars))
+				cls.vars.sort()
+			elif getattr(cls,'run',None)and not'hcode'in cls.__dict__:
+				cls.hcode=Utils.h_fun(cls.run)
+			if not getattr(cls,'nocache',None):
+				cls=cache_outputs(cls)
+			classes[name]=cls
+evil=store_task_type('evil',(object,),{})
+class TaskBase(evil):
+	color='GREEN'
+	ext_in=[]
+	ext_out=[]
+	before=[]
+	after=[]
+	hcode=''
+	def __init__(self,*k,**kw):
+		self.hasrun=NOT_RUN
+		try:
+			self.generator=kw['generator']
+		except KeyError:
+			self.generator=self
+	def __repr__(self):
+		return'\n\t{task %r: %s %s}'%(self.__class__.__name__,id(self),str(getattr(self,'fun','')))
+	def __str__(self):
+		if hasattr(self,'fun'):
+			return'executing: %s\n'%self.fun.__name__
+		return self.__class__.__name__+'\n'
+	def __hash__(self):
+		return id(self)
+	def exec_command(self,cmd,**kw):
+		bld=self.generator.bld
+		try:
+			if not kw.get('cwd',None):
+				kw['cwd']=bld.cwd
+		except AttributeError:
+			bld.cwd=kw['cwd']=bld.variant_dir
+		return bld.exec_command(cmd,**kw)
+	def runnable_status(self):
+		return RUN_ME
+	def process(self):
+		m=self.master
+		if m.stop:
+			m.out.put(self)
+			return
+		try:
+			del self.generator.bld.task_sigs[self.uid()]
+		except:
+			pass
+		try:
+			self.generator.bld.returned_tasks.append(self)
+			self.log_display(self.generator.bld)
+			ret=self.run()
+		except Exception:
+			self.err_msg=Utils.ex_stack()
+			self.hasrun=EXCEPTION
+			m.error_handler(self)
+			m.out.put(self)
+			return
+		if ret:
+			self.err_code=ret
+			self.hasrun=CRASHED
+		else:
+			try:
+				self.post_run()
+			except Errors.WafError:
+				pass
+			except Exception:
+				self.err_msg=Utils.ex_stack()
+				self.hasrun=EXCEPTION
+			else:
+				self.hasrun=SUCCESS
+		if self.hasrun!=SUCCESS:
+			m.error_handler(self)
+		m.out.put(self)
+	def run(self):
+		if hasattr(self,'fun'):
+			return self.fun(self)
+		return 0
+	def post_run(self):
+		pass
+	def log_display(self,bld):
+		bld.to_log(self.display())
+	def display(self):
+		col1=Logs.colors(self.color)
+		col2=Logs.colors.NORMAL
+		master=self.master
+		def cur():
+			tmp=-1
+			if hasattr(master,'ready'):
+				tmp-=master.ready.qsize()
+			return master.processed+tmp
+		if self.generator.bld.progress_bar==1:
+			return self.generator.bld.progress_line(cur(),master.total,col1,col2)
+		if self.generator.bld.progress_bar==2:
+			ela=str(self.generator.bld.timer)
+			try:
+				ins=','.join([n.name for n in self.inputs])
+			except AttributeError:
+				ins=''
+			try:
+				outs=','.join([n.name for n in self.outputs])
+			except AttributeError:
+				outs=''
+			return'|Total %s|Current %s|Inputs %s|Outputs %s|Time %s|\n'%(master.total,cur(),ins,outs,ela)
+		s=str(self)
+		if not s:
+			return None
+		total=master.total
+		n=len(str(total))
+		fs='[%%%dd/%%%dd] %%s%%s%%s'%(n,n)
+		return fs%(cur(),total,col1,s,col2)
+	def attr(self,att,default=None):
+		ret=getattr(self,att,self)
+		if ret is self:return getattr(self.__class__,att,default)
+		return ret
+	def hash_constraints(self):
+		cls=self.__class__
+		tup=(str(cls.before),str(cls.after),str(cls.ext_in),str(cls.ext_out),cls.__name__,cls.hcode)
+		h=hash(tup)
+		return h
+	def format_error(self):
+		msg=getattr(self,'last_cmd','')
+		name=getattr(self.generator,'name','')
+		if getattr(self,"err_msg",None):
+			return self.err_msg
+		elif not self.hasrun:
+			return'task in %r was not executed for some reason: %r'%(name,self)
+		elif self.hasrun==CRASHED:
+			try:
+				return' -> task in %r failed (exit status %r): %r\n%r'%(name,self.err_code,self,msg)
+			except AttributeError:
+				return' -> task in %r failed: %r\n%r'%(name,self,msg)
+		elif self.hasrun==MISSING:
+			return' -> missing files in %r: %r\n%r'%(name,self,msg)
+		else:
+			return'invalid status for task in %r: %r'%(name,self.hasrun)
+	def colon(self,var1,var2):
+		tmp=self.env[var1]
+		if isinstance(var2,str):
+			it=self.env[var2]
+		else:
+			it=var2
+		if isinstance(tmp,str):
+			return[tmp%x for x in it]
+		else:
+			if Logs.verbose and not tmp and it:
+				Logs.warn('Missing env variable %r for task %r (generator %r)'%(var1,self,self.generator))
+			lst=[]
+			for y in it:
+				lst.extend(tmp)
+				lst.append(y)
+			return lst
+class Task(TaskBase):
+	vars=[]
+	shell=False
+	def __init__(self,*k,**kw):
+		TaskBase.__init__(self,*k,**kw)
+		self.env=kw['env']
+		self.inputs=[]
+		self.outputs=[]
+		self.dep_nodes=[]
+		self.run_after=set([])
+	def __str__(self):
+		env=self.env
+		src_str=' '.join([a.nice_path(env)for a in self.inputs])
+		tgt_str=' '.join([a.nice_path(env)for a in self.outputs])
+		if self.outputs:sep=' -> '
+		else:sep=''
+		return'%s: %s%s%s\n'%(self.__class__.__name__.replace('_task',''),src_str,sep,tgt_str)
+	def __repr__(self):
+		return"".join(['\n\t{task %r: '%id(self),self.__class__.__name__," ",",".join([x.name for x in self.inputs])," -> ",",".join([x.name for x in self.outputs]),'}'])
+	def uid(self):
+		try:
+			return self.uid_
+		except AttributeError:
+			m=Utils.md5()
+			up=m.update
+			up(self.__class__.__name__)
+			for x in self.inputs+self.outputs:
+				up(x.abspath())
+			self.uid_=m.digest()
+			return self.uid_
+	def set_inputs(self,inp):
+		if isinstance(inp,list):self.inputs+=inp
+		else:self.inputs.append(inp)
+	def set_outputs(self,out):
+		if isinstance(out,list):self.outputs+=out
+		else:self.outputs.append(out)
+	def set_run_after(self,task):
+		assert isinstance(task,TaskBase)
+		self.run_after.add(task)
+	def signature(self):
+		try:return self.cache_sig
+		except AttributeError:pass
+		self.m=Utils.md5()
+		self.m.update(self.hcode)
+		self.sig_explicit_deps()
+		self.sig_vars()
+		if self.scan:
+			try:
+				self.sig_implicit_deps()
+			except Errors.TaskRescan:
+				return self.signature()
+		ret=self.cache_sig=self.m.digest()
+		return ret
+	def runnable_status(self):
+		for t in self.run_after:
+			if not t.hasrun:
+				return ASK_LATER
+		bld=self.generator.bld
+		try:
+			new_sig=self.signature()
+		except Errors.TaskNotReady:
+			return ASK_LATER
+		key=self.uid()
+		try:
+			prev_sig=bld.task_sigs[key]
+		except KeyError:
+			Logs.debug("task: task %r must run as it was never run before or the task code changed"%self)
+			return RUN_ME
+		for node in self.outputs:
+			try:
+				if node.sig!=new_sig:
+					return RUN_ME
+			except AttributeError:
+				Logs.debug("task: task %r must run as the output nodes do not exist"%self)
+				return RUN_ME
+		if new_sig!=prev_sig:
+			return RUN_ME
+		return SKIP_ME
+	def post_run(self):
+		bld=self.generator.bld
+		sig=self.signature()
+		for node in self.outputs:
+			try:
+				os.stat(node.abspath())
+			except OSError:
+				self.hasrun=MISSING
+				self.err_msg='-> missing file: %r'%node.abspath()
+				raise Errors.WafError(self.err_msg)
+			node.sig=sig
+		bld.task_sigs[self.uid()]=self.cache_sig
+	def sig_explicit_deps(self):
+		bld=self.generator.bld
+		upd=self.m.update
+		for x in self.inputs+self.dep_nodes:
+			try:
+				upd(x.get_bld_sig())
+			except(AttributeError,TypeError):
+				raise Errors.WafError('Missing node signature for %r (required by %r)'%(x,self))
+		if bld.deps_man:
+			additional_deps=bld.deps_man
+			for x in self.inputs+self.outputs:
+				try:
+					d=additional_deps[id(x)]
+				except KeyError:
+					continue
+				for v in d:
+					if isinstance(v,bld.root.__class__):
+						try:
+							v=v.get_bld_sig()
+						except AttributeError:
+							raise Errors.WafError('Missing node signature for %r (required by %r)'%(v,self))
+					elif hasattr(v,'__call__'):
+						v=v()
+					upd(v)
+		return self.m.digest()
+	def sig_vars(self):
+		bld=self.generator.bld
+		env=self.env
+		upd=self.m.update
+		act_sig=bld.hash_env_vars(env,self.__class__.vars)
+		upd(act_sig)
+		dep_vars=getattr(self,'dep_vars',None)
+		if dep_vars:
+			upd(bld.hash_env_vars(env,dep_vars))
+		return self.m.digest()
+	scan=None
+	def sig_implicit_deps(self):
+		bld=self.generator.bld
+		key=self.uid()
+		prev=bld.task_sigs.get((key,'imp'),[])
+		if prev:
+			try:
+				if prev==self.compute_sig_implicit_deps():
+					return prev
+			except:
+				for x in bld.node_deps.get(self.uid(),[]):
+					if x.is_child_of(bld.srcnode):
+						try:
+							os.stat(x.abspath())
+						except:
+							try:
+								del x.parent.children[x.name]
+							except:
+								pass
+			del bld.task_sigs[(key,'imp')]
+			raise Errors.TaskRescan('rescan')
+		(nodes,names)=self.scan()
+		if Logs.verbose:
+			Logs.debug('deps: scanner for %s returned %s %s'%(str(self),str(nodes),str(names)))
+		bld.node_deps[key]=nodes
+		bld.raw_deps[key]=names
+		self.are_implicit_nodes_ready()
+		try:
+			bld.task_sigs[(key,'imp')]=sig=self.compute_sig_implicit_deps()
+		except:
+			if Logs.verbose:
+				for k in bld.node_deps.get(self.uid(),[]):
+					try:
+						k.get_bld_sig()
+					except:
+						Logs.warn('Missing signature for node %r (may cause rebuilds)'%k)
+		else:
+			return sig
+	def compute_sig_implicit_deps(self):
+		upd=self.m.update
+		bld=self.generator.bld
+		self.are_implicit_nodes_ready()
+		for k in bld.node_deps.get(self.uid(),[]):
+			upd(k.get_bld_sig())
+		return self.m.digest()
+	def are_implicit_nodes_ready(self):
+		bld=self.generator.bld
+		try:
+			cache=bld.dct_implicit_nodes
+		except:
+			bld.dct_implicit_nodes=cache={}
+		try:
+			dct=cache[bld.cur]
+		except KeyError:
+			dct=cache[bld.cur]={}
+			for tsk in bld.cur_tasks:
+				for x in tsk.outputs:
+					dct[x]=tsk
+		modified=False
+		for x in bld.node_deps.get(self.uid(),[]):
+			if x in dct:
+				self.run_after.add(dct[x])
+				modified=True
+		if modified:
+			for tsk in self.run_after:
+				if not tsk.hasrun:
+					raise Errors.TaskNotReady('not ready')
+	def can_retrieve_cache(self):
+		if not getattr(self,'outputs',None):
+			return None
+		sig=self.signature()
+		ssig=Utils.to_hex(self.uid())+Utils.to_hex(sig)
+		dname=os.path.join(self.generator.bld.cache_global,ssig)
+		try:
+			t1=os.stat(dname).st_mtime
+		except OSError:
+			return None
+		for node in self.outputs:
+			orig=os.path.join(dname,node.name)
+			try:
+				shutil.copy2(orig,node.abspath())
+				os.utime(orig,None)
+			except(OSError,IOError):
+				Logs.debug('task: failed retrieving file')
+				return None
+		try:
+			t2=os.stat(dname).st_mtime
+		except OSError:
+			return None
+		if t1!=t2:
+			return None
+		for node in self.outputs:
+			node.sig=sig
+			if self.generator.bld.progress_bar<1:
+				self.generator.bld.to_log('restoring from cache %r\n'%node.abspath())
+		self.cached=True
+		return True
+	def put_files_cache(self):
+		if getattr(self,'cached',None):
+			return None
+		if not getattr(self,'outputs',None):
+			return None
+		sig=self.signature()
+		ssig=Utils.to_hex(self.uid())+Utils.to_hex(sig)
+		dname=os.path.join(self.generator.bld.cache_global,ssig)
+		tmpdir=tempfile.mkdtemp(prefix=self.generator.bld.cache_global+os.sep+'waf')
+		try:
+			shutil.rmtree(dname)
+		except:
+			pass
+		try:
+			for node in self.outputs:
+				dest=os.path.join(tmpdir,node.name)
+				shutil.copy2(node.abspath(),dest)
+		except(OSError,IOError):
+			try:
+				shutil.rmtree(tmpdir)
+			except:
+				pass
+		else:
+			try:
+				os.rename(tmpdir,dname)
+			except OSError:
+				try:
+					shutil.rmtree(tmpdir)
+				except:
+					pass
+			else:
+				try:
+					os.chmod(dname,Utils.O755)
+				except:
+					pass
+def is_before(t1,t2):
+	to_list=Utils.to_list
+	for k in to_list(t2.ext_in):
+		if k in to_list(t1.ext_out):
+			return 1
+	if t1.__class__.__name__ in to_list(t2.after):
+		return 1
+	if t2.__class__.__name__ in to_list(t1.before):
+		return 1
+	return 0
+def set_file_constraints(tasks):
+	ins=Utils.defaultdict(set)
+	outs=Utils.defaultdict(set)
+	for x in tasks:
+		for a in getattr(x,'inputs',[])+getattr(x,'dep_nodes',[]):
+			ins[id(a)].add(x)
+		for a in getattr(x,'outputs',[]):
+			outs[id(a)].add(x)
+	links=set(ins.keys()).intersection(outs.keys())
+	for k in links:
+		for a in ins[k]:
+			a.run_after.update(outs[k])
+def set_precedence_constraints(tasks):
+	cstr_groups=Utils.defaultdict(list)
+	for x in tasks:
+		h=x.hash_constraints()
+		cstr_groups[h].append(x)
+	keys=list(cstr_groups.keys())
+	maxi=len(keys)
+	for i in range(maxi):
+		t1=cstr_groups[keys[i]][0]
+		for j in range(i+1,maxi):
+			t2=cstr_groups[keys[j]][0]
+			if is_before(t1,t2):
+				a=i
+				b=j
+			elif is_before(t2,t1):
+				a=j
+				b=i
+			else:
+				continue
+			for x in cstr_groups[keys[b]]:
+				x.run_after.update(cstr_groups[keys[a]])
+def funex(c):
+	dc={}
+	exec(c,dc)
+	return dc['f']
+reg_act=re.compile(r"(?P<backslash>\\)|(?P<dollar>\$\$)|(?P<subst>\$\{(?P<var>\w+)(?P<code>.*?)\})",re.M)
+def compile_fun_shell(line):
+	extr=[]
+	def repl(match):
+		g=match.group
+		if g('dollar'):return"$"
+		elif g('backslash'):return'\\\\'
+		elif g('subst'):extr.append((g('var'),g('code')));return"%s"
+		return None
+	line=reg_act.sub(repl,line)or line
+	parm=[]
+	dvars=[]
+	app=parm.append
+	for(var,meth)in extr:
+		if var=='SRC':
+			if meth:app('tsk.inputs%s'%meth)
+			else:app('" ".join([a.path_from(bld.bldnode) for a in tsk.inputs])')
+		elif var=='TGT':
+			if meth:app('tsk.outputs%s'%meth)
+			else:app('" ".join([a.path_from(bld.bldnode) for a in tsk.outputs])')
+		elif meth:
+			if meth.startswith(':'):
+				m=meth[1:]
+				if m=='SRC':
+					m='[a.path_from(bld.bldnode) for a in tsk.inputs]'
+				elif m=='TGT':
+					m='[a.path_from(bld.bldnode) for a in tsk.outputs]'
+				elif m[:3]not in('tsk','gen','bld'):
+					dvars.extend([var,meth[1:]])
+					m='%r'%m
+				app('" ".join(tsk.colon(%r, %s))'%(var,m))
+			else:
+				app('%s%s'%(var,meth))
+		else:
+			if not var in dvars:dvars.append(var)
+			app("p('%s')"%var)
+	if parm:parm="%% (%s) "%(',\n\t\t'.join(parm))
+	else:parm=''
+	c=COMPILE_TEMPLATE_SHELL%(line,parm)
+	Logs.debug('action: %s'%c)
+	return(funex(c),dvars)
+def compile_fun_noshell(line):
+	extr=[]
+	def repl(match):
+		g=match.group
+		if g('dollar'):return"$"
+		elif g('subst'):extr.append((g('var'),g('code')));return"<<|@|>>"
+		return None
+	line2=reg_act.sub(repl,line)
+	params=line2.split('<<|@|>>')
+	assert(extr)
+	buf=[]
+	dvars=[]
+	app=buf.append
+	for x in range(len(extr)):
+		params[x]=params[x].strip()
+		if params[x]:
+			app("lst.extend(%r)"%params[x].split())
+		(var,meth)=extr[x]
+		if var=='SRC':
+			if meth:app('lst.append(tsk.inputs%s)'%meth)
+			else:app("lst.extend([a.path_from(bld.bldnode) for a in tsk.inputs])")
+		elif var=='TGT':
+			if meth:app('lst.append(tsk.outputs%s)'%meth)
+			else:app("lst.extend([a.path_from(bld.bldnode) for a in tsk.outputs])")
+		elif meth:
+			if meth.startswith(':'):
+				m=meth[1:]
+				if m=='SRC':
+					m='[a.path_from(bld.bldnode) for a in tsk.inputs]'
+				elif m=='TGT':
+					m='[a.path_from(bld.bldnode) for a in tsk.outputs]'
+				elif m[:3]not in('tsk','gen','bld'):
+					dvars.extend([var,m])
+					m='%r'%m
+				app('lst.extend(tsk.colon(%r, %s))'%(var,m))
+			else:
+				app('lst.extend(gen.to_list(%s%s))'%(var,meth))
+		else:
+			app('lst.extend(to_list(env[%r]))'%var)
+			if not var in dvars:dvars.append(var)
+	if extr:
+		if params[-1]:
+			app("lst.extend(%r)"%params[-1].split())
+	fun=COMPILE_TEMPLATE_NOSHELL%"\n\t".join(buf)
+	Logs.debug('action: %s'%fun)
+	return(funex(fun),dvars)
+def compile_fun(line,shell=False):
+	if line.find('<')>0 or line.find('>')>0 or line.find('&&')>0:
+		shell=True
+	if shell:
+		return compile_fun_shell(line)
+	else:
+		return compile_fun_noshell(line)
+def task_factory(name,func=None,vars=None,color='GREEN',ext_in=[],ext_out=[],before=[],after=[],shell=False,scan=None):
+	params={'vars':vars or[],'color':color,'name':name,'ext_in':Utils.to_list(ext_in),'ext_out':Utils.to_list(ext_out),'before':Utils.to_list(before),'after':Utils.to_list(after),'shell':shell,'scan':scan,}
+	if isinstance(func,str):
+		params['run_str']=func
+	else:
+		params['run']=func
+	cls=type(Task)(name,(Task,),params)
+	global classes
+	classes[name]=cls
+	return cls
+def always_run(cls):
+	old=cls.runnable_status
+	def always(self):
+		ret=old(self)
+		if ret==SKIP_ME:
+			ret=RUN_ME
+		return ret
+	cls.runnable_status=always
+	return cls
+def update_outputs(cls):
+	old_post_run=cls.post_run
+	def post_run(self):
+		old_post_run(self)
+		for node in self.outputs:
+			node.sig=Utils.h_file(node.abspath())
+			self.generator.bld.task_sigs[node.abspath()]=self.uid()
+	cls.post_run=post_run
+	old_runnable_status=cls.runnable_status
+	def runnable_status(self):
+		status=old_runnable_status(self)
+		if status!=RUN_ME:
+			return status
+		try:
+			bld=self.generator.bld
+			prev_sig=bld.task_sigs[self.uid()]
+			if prev_sig==self.signature():
+				for x in self.outputs:
+					if not x.sig or bld.task_sigs[x.abspath()]!=self.uid():
+						return RUN_ME
+				return SKIP_ME
+		except KeyError:
+			pass
+		except IndexError:
+			pass
+		except AttributeError:
+			pass
+		return RUN_ME
+	cls.runnable_status=runnable_status
+	return cls
diff --git a/waflib/TaskGen.py b/waflib/TaskGen.py
new file mode 100644
index 0000000..8d8f26d
--- /dev/null
+++ b/waflib/TaskGen.py
@@ -0,0 +1,353 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import sys
+if sys.hexversion < 0x020400f0: from sets import Set as set
+import copy,re,os
+from waflib import Task,Utils,Logs,Errors,ConfigSet
+feats=Utils.defaultdict(set)
+class task_gen(object):
+	mappings={}
+	prec=Utils.defaultdict(list)
+	def __init__(self,*k,**kw):
+		self.source=''
+		self.target=''
+		self.meths=[]
+		self.prec=Utils.defaultdict(list)
+		self.mappings={}
+		self.features=[]
+		self.tasks=[]
+		if not'bld'in kw:
+			self.env=ConfigSet.ConfigSet()
+			self.idx=0
+			self.path=None
+		else:
+			self.bld=kw['bld']
+			self.env=self.bld.env.derive()
+			self.path=self.bld.path
+			try:
+				self.idx=self.bld.idx[id(self.path)]=self.bld.idx.get(id(self.path),0)+1
+			except AttributeError:
+				self.bld.idx={}
+				self.idx=self.bld.idx[id(self.path)]=1
+		for key,val in kw.items():
+			setattr(self,key,val)
+	def __str__(self):
+		return"<task_gen %r declared in %s>"%(self.name,self.path.abspath())
+	def __repr__(self):
+		lst=[]
+		for x in self.__dict__.keys():
+			if x not in['env','bld','compiled_tasks','tasks']:
+				lst.append("%s=%s"%(x,repr(getattr(self,x))))
+		return"bld(%s) in %s"%(", ".join(lst),self.path.abspath())
+	def get_name(self):
+		try:
+			return self._name
+		except AttributeError:
+			if isinstance(self.target,list):
+				lst=[str(x)for x in self.target]
+				name=self._name=','.join(lst)
+			else:
+				name=self._name=str(self.target)
+			return name
+	def set_name(self,name):
+		self._name=name
+	name=property(get_name,set_name)
+	def to_list(self,val):
+		if isinstance(val,str):return val.split()
+		else:return val
+	def post(self):
+		if getattr(self,'posted',None):
+			return False
+		self.posted=True
+		keys=set(self.meths)
+		self.features=Utils.to_list(self.features)
+		for x in self.features+['*']:
+			st=feats[x]
+			if not st:
+				if not x in Task.classes:
+					Logs.warn('feature %r does not exist - bind at least one method to it'%x)
+			keys.update(list(st))
+		prec={}
+		prec_tbl=self.prec or task_gen.prec
+		for x in prec_tbl:
+			if x in keys:
+				prec[x]=prec_tbl[x]
+		tmp=[]
+		for a in keys:
+			for x in prec.values():
+				if a in x:break
+			else:
+				tmp.append(a)
+		out=[]
+		while tmp:
+			e=tmp.pop()
+			if e in keys:out.append(e)
+			try:
+				nlst=prec[e]
+			except KeyError:
+				pass
+			else:
+				del prec[e]
+				for x in nlst:
+					for y in prec:
+						if x in prec[y]:
+							break
+					else:
+						tmp.append(x)
+		if prec:
+			raise Errors.WafError('Cycle detected in the method execution %r'%prec)
+		out.reverse()
+		self.meths=out
+		Logs.debug('task_gen: posting %s %d'%(self,id(self)))
+		for x in out:
+			try:
+				v=getattr(self,x)
+			except AttributeError:
+				raise Errors.WafError('%r is not a valid task generator method'%x)
+			Logs.debug('task_gen: -> %s (%d)'%(x,id(self)))
+			v()
+		Logs.debug('task_gen: posted %s'%self.name)
+		return True
+	def get_hook(self,node):
+		name=node.name
+		for k in self.mappings:
+			if name.endswith(k):
+				return self.mappings[k]
+		for k in task_gen.mappings:
+			if name.endswith(k):
+				return task_gen.mappings[k]
+		raise Errors.WafError("File %r has no mapping in %r (did you forget to load a waf tool?)"%(node,task_gen.mappings.keys()))
+	def create_task(self,name,src=None,tgt=None):
+		task=Task.classes[name](env=self.env.derive(),generator=self)
+		if src:
+			task.set_inputs(src)
+		if tgt:
+			task.set_outputs(tgt)
+		self.tasks.append(task)
+		return task
+	def clone(self,env):
+		newobj=self.bld()
+		for x in self.__dict__:
+			if x in['env','bld']:
+				continue
+			elif x in['path','features']:
+				setattr(newobj,x,getattr(self,x))
+			else:
+				setattr(newobj,x,copy.copy(getattr(self,x)))
+		newobj.posted=False
+		if isinstance(env,str):
+			newobj.env=self.bld.all_envs[env].derive()
+		else:
+			newobj.env=env.derive()
+		return newobj
+def declare_chain(name='',rule=None,reentrant=None,color='BLUE',ext_in=[],ext_out=[],before=[],after=[],decider=None,scan=None,install_path=None,shell=False):
+	ext_in=Utils.to_list(ext_in)
+	ext_out=Utils.to_list(ext_out)
+	if not name:
+		name=rule
+	cls=Task.task_factory(name,rule,color=color,ext_in=ext_in,ext_out=ext_out,before=before,after=after,scan=scan,shell=shell)
+	def x_file(self,node):
+		ext=decider and decider(self,node)or cls.ext_out
+		if ext_in:
+			_ext_in=ext_in[0]
+		tsk=self.create_task(name,node)
+		cnt=0
+		keys=self.mappings.keys()+self.__class__.mappings.keys()
+		for x in ext:
+			k=node.change_ext(x,ext_in=_ext_in)
+			tsk.outputs.append(k)
+			if reentrant!=None:
+				if cnt<int(reentrant):
+					self.source.append(k)
+			else:
+				for y in keys:
+					if k.name.endswith(y):
+						self.source.append(k)
+						break
+			cnt+=1
+		if install_path:
+			self.bld.install_files(install_path,tsk.outputs)
+		return tsk
+	for x in cls.ext_in:
+		task_gen.mappings[x]=x_file
+	return x_file
+def taskgen_method(func):
+	setattr(task_gen,func.__name__,func)
+	return func
+def feature(*k):
+	def deco(func):
+		setattr(task_gen,func.__name__,func)
+		for name in k:
+			feats[name].update([func.__name__])
+		return func
+	return deco
+def before_method(*k):
+	def deco(func):
+		setattr(task_gen,func.__name__,func)
+		for fun_name in k:
+			if not func.__name__ in task_gen.prec[fun_name]:
+				task_gen.prec[fun_name].append(func.__name__)
+		return func
+	return deco
+before=before_method
+def after_method(*k):
+	def deco(func):
+		setattr(task_gen,func.__name__,func)
+		for fun_name in k:
+			if not fun_name in task_gen.prec[func.__name__]:
+				task_gen.prec[func.__name__].append(fun_name)
+		return func
+	return deco
+after=after_method
+def extension(*k):
+	def deco(func):
+		setattr(task_gen,func.__name__,func)
+		for x in k:
+			task_gen.mappings[x]=func
+		return func
+	return deco
+def to_nodes(self,lst,path=None):
+	tmp=[]
+	path=path or self.path
+	find=path.find_resource
+	if isinstance(lst,self.path.__class__):
+		lst=[lst]
+	for x in Utils.to_list(lst):
+		if isinstance(x,str):
+			node=find(x)
+		else:
+			node=x
+		if not node:
+			raise Errors.WafError("source not found: %r in %r"%(x,self))
+		tmp.append(node)
+	return tmp
+def process_source(self):
+	self.source=self.to_nodes(getattr(self,'source',[]))
+	for node in self.source:
+		self.get_hook(node)(self,node)
+def process_rule(self):
+	if not getattr(self,'rule',None):
+		return
+	name=str(getattr(self,'name',None)or self.target or self.rule)
+	cls=Task.task_factory(name,self.rule,getattr(self,'vars',[]),shell=getattr(self,'shell',True),color=getattr(self,'color','BLUE'))
+	tsk=self.create_task(name)
+	if getattr(self,'target',None):
+		if isinstance(self.target,str):
+			self.target=self.target.split()
+		if not isinstance(self.target,list):
+			self.target=[self.target]
+		for x in self.target:
+			if isinstance(x,str):
+				tsk.outputs.append(self.path.find_or_declare(x))
+			else:
+				x.parent.mkdir()
+				tsk.outputs.append(x)
+		if getattr(self,'install_path',None):
+			self.bld.install_files(self.install_path,tsk.outputs)
+	if getattr(self,'source',None):
+		tsk.inputs=self.to_nodes(self.source)
+		self.source=[]
+	if getattr(self,'scan',None):
+		cls.scan=self.scan
+	elif getattr(self,'deps',None):
+		def scan(self):
+			nodes=[]
+			for x in self.generator.to_list(self.generator.deps):
+				node=self.generator.path.find_resource(x)
+				if not node:
+					self.generator.bld.fatal('Could not find %r (was it declared?)'%x)
+				nodes.append(node)
+			return[nodes,[]]
+		cls.scan=scan
+	if getattr(self,'cwd',None):
+		tsk.cwd=self.cwd
+	if getattr(self,'update_outputs',None)or getattr(self,'on_results',None):
+		Task.update_outputs(cls)
+	if getattr(self,'always',None):
+		Task.always_run(cls)
+	for x in['after','before','ext_in','ext_out']:
+		setattr(cls,x,getattr(self,x,[]))
+def sequence_order(self):
+	if self.meths and self.meths[-1]!='sequence_order':
+		self.meths.append('sequence_order')
+		return
+	if getattr(self,'seq_start',None):
+		return
+	if getattr(self.bld,'prev',None):
+		self.bld.prev.post()
+		for x in self.bld.prev.tasks:
+			for y in self.tasks:
+				y.set_run_after(x)
+	self.bld.prev=self
+re_m4=re.compile('@(\w+)@',re.M)
+class subst_pc(Task.Task):
+	def run(self):
+		code=self.inputs[0].read()
+		code=code.replace('%','%%')
+		lst=[]
+		def repl(match):
+			g=match.group
+			if g(1):
+				lst.append(g(1))
+				return"%%(%s)s"%g(1)
+			return''
+		code=re_m4.sub(repl,code)
+		try:
+			d=self.generator.dct
+		except AttributeError:
+			d={}
+			for x in lst:
+				tmp=getattr(self.generator,x,'')or self.env.get_flat(x)or self.env.get_flat(x.upper())
+				d[x]=str(tmp)
+		self.outputs[0].write(code%d)
+		self.generator.bld.raw_deps[self.uid()]=self.dep_vars=lst
+		try:delattr(self,'cache_sig')
+		except AttributeError:pass
+		if getattr(self.generator,'chmod',None):
+			os.chmod(self.outputs[0].abspath(),self.generator.chmod)
+	def sig_vars(self):
+		bld=self.generator.bld
+		env=self.env
+		upd=self.m.update
+		vars=self.generator.bld.raw_deps.get(self.uid(),[])
+		act_sig=bld.hash_env_vars(env,vars)
+		upd(act_sig)
+		lst=[getattr(self.generator,x,'')for x in vars]
+		upd(Utils.h_list(lst))
+		return self.m.digest()
+def add_pcfile(self,node):
+	tsk=self.create_task('subst_pc',node,node.change_ext('.pc','.pc.in'))
+	self.bld.install_files(getattr(self,'install_path','${LIBDIR}/pkgconfig/'),tsk.outputs)
+class subst(subst_pc):
+	pass
+def process_subst(self):
+	src=self.to_nodes(getattr(self,'source',[]))
+	tgt=getattr(self,'target',[])
+	if isinstance(tgt,self.path.__class__):
+		tgt=[tgt]
+	tgt=[isinstance(x,self.path.__class__)and x or self.path.find_or_declare(x)for x in Utils.to_list(tgt)]
+	if len(src)!=len(tgt):
+		raise Errors.WafError('invalid source or target for %r'%self)
+	for x,y in zip(src,tgt):
+		if not(x and y):
+			raise Errors.WafError('invalid source or target for %r'%self)
+		tsk=self.create_task('subst',x,y)
+		for a in('after','before','ext_in','ext_out'):
+			val=getattr(self,a,None)
+			if val:
+				setattr(tsk,a,val)
+	inst_to=getattr(self,'install_path',None)
+	if inst_to:
+		self.bld.install_files(inst_to,tgt,chmod=getattr(self,'chmod',Utils.O644))
+	self.source=[]
+
+taskgen_method(to_nodes)
+feature('*')(process_source)
+feature('*')(process_rule)
+before_method('process_source')(process_rule)
+feature('seq')(sequence_order)
+extension('.pc.in')(add_pcfile)
+feature('subst')(process_subst)
+before_method('process_source','process_rule')(process_subst)
\ No newline at end of file
diff --git a/waflib/Tools/__init__.py b/waflib/Tools/__init__.py
new file mode 100644
index 0000000..efeed79
--- /dev/null
+++ b/waflib/Tools/__init__.py
@@ -0,0 +1,4 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
diff --git a/waflib/Tools/ar.py b/waflib/Tools/ar.py
new file mode 100644
index 0000000..fd0b7d5
--- /dev/null
+++ b/waflib/Tools/ar.py
@@ -0,0 +1,12 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+from waflib.Configure import conf
+def find_ar(conf):
+	conf.load('ar')
+def configure(conf):
+	conf.find_program('ar',var='AR')
+	conf.env.ARFLAGS='rcs'
+
+conf(find_ar)
\ No newline at end of file
diff --git a/waflib/Tools/asm.py b/waflib/Tools/asm.py
new file mode 100644
index 0000000..d78dff5
--- /dev/null
+++ b/waflib/Tools/asm.py
@@ -0,0 +1,25 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os,sys
+from waflib import Task,Utils
+import waflib.Task
+from waflib.Tools.ccroot import link_task,stlink_task
+from waflib.TaskGen import extension,feature
+class asm(Task.Task):
+	color='BLUE'
+	run_str='${AS} ${ASFLAGS} ${CPPPATH_ST:INCPATHS} ${AS_SRC_F}${SRC} ${AS_TGT_F}${TGT}'
+def asm_hook(self,node):
+	return self.create_compiled_task('asm',node)
+class asmprogram(link_task):
+	run_str='${ASLINK} ${ASLINKFLAGS} ${ASLNK_TGT_F}${TGT} ${ASLNK_SRC_F}${SRC}'
+	ext_out=['.bin']
+	inst_to='${BINDIR}'
+	chmod=Utils.O755
+class asmshlib(asmprogram):
+	inst_to='${LIBDIR}'
+class asmstlib(stlink_task):
+	pass
+
+extension('.s','.S','.asm','.ASM','.spp','.SPP')(asm_hook)
\ No newline at end of file
diff --git a/waflib/Tools/bison.py b/waflib/Tools/bison.py
new file mode 100644
index 0000000..a354e3e
--- /dev/null
+++ b/waflib/Tools/bison.py
@@ -0,0 +1,29 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+from waflib import Task
+from waflib.TaskGen import extension
+class bison(Task.Task):
+	color='BLUE'
+	run_str='${BISON} ${BISONFLAGS} ${SRC[0].abspath()} -o ${TGT[0].name}'
+	ext_out=['.h']
+def big_bison(self,node):
+	has_h='-d'in self.env['BISONFLAGS']
+	outs=[]
+	if node.name.endswith('.yc'):
+		outs.append(node.change_ext('.tab.cc'))
+		if has_h:
+			outs.append(node.change_ext('.tab.hh'))
+	else:
+		outs.append(node.change_ext('.tab.c'))
+		if has_h:
+			outs.append(node.change_ext('.tab.h'))
+	tsk=self.create_task('bison',node,outs)
+	tsk.cwd=node.parent.get_bld().abspath()
+	self.source.append(outs[0])
+def configure(conf):
+	conf.find_program('bison',var='BISON')
+	conf.env.BISONFLAGS=['-d']
+
+extension('.y','.yc','.yy')(big_bison)
\ No newline at end of file
diff --git a/waflib/Tools/c.py b/waflib/Tools/c.py
new file mode 100644
index 0000000..3c941de
--- /dev/null
+++ b/waflib/Tools/c.py
@@ -0,0 +1,27 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+from waflib import TaskGen,Task,Utils
+from waflib.Tools import c_preproc
+from waflib.Tools.ccroot import link_task,stlink_task
+def c_hook(self,node):
+	return self.create_compiled_task('c',node)
+class c(Task.Task):
+	run_str='${CC} ${ARCH_ST:ARCH} ${CFLAGS} ${CPPFLAGS} ${FRAMEWORKPATH_ST:FRAMEWORKPATH} ${CPPPATH_ST:INCPATHS} ${DEFINES_ST:DEFINES} ${CC_SRC_F}${SRC} ${CC_TGT_F}${TGT}'
+	vars=['CCDEPS']
+	ext_in=['.h']
+	scan=c_preproc.scan
+Task.classes['cc']=cc=c
+class cprogram(link_task):
+	run_str='${LINK_CC} ${LINKFLAGS} ${CCLNK_SRC_F}${SRC} ${CCLNK_TGT_F}${TGT[0].abspath()} ${RPATH_ST:RPATH} ${FRAMEWORKPATH_ST:FRAMEWORKPATH} ${FRAMEWORK_ST:FRAMEWORK} ${ARCH_ST:ARCH} ${STLIB_MARKER} ${STLIBPATH_ST:STLIBPATH} ${STLIB_ST:STLIB} ${SHLIB_MARKER} ${LIBPATH_ST:LIBPATH} ${LIB_ST:LIB}'
+	ext_out=['.bin']
+	vars=['LINKDEPS']
+	inst_to='${BINDIR}'
+	chmod=Utils.O755
+class cshlib(cprogram):
+	inst_to='${LIBDIR}'
+class cstlib(stlink_task):
+	pass
+
+TaskGen.extension('.c')(c_hook)
\ No newline at end of file
diff --git a/waflib/Tools/c_aliases.py b/waflib/Tools/c_aliases.py
new file mode 100644
index 0000000..f21fb9e
--- /dev/null
+++ b/waflib/Tools/c_aliases.py
@@ -0,0 +1,56 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os,sys,re
+from waflib import Utils,Build
+from waflib.Configure import conf
+def get_extensions(lst):
+	ret=[]
+	for x in Utils.to_list(lst):
+		try:
+			if not isinstance(x,str):
+				x=x.name
+			ret.append(x[x.rfind('.')+1:])
+		except:
+			pass
+	return ret
+def sniff_features(**kw):
+	exts=get_extensions(kw['source'])
+	type=kw['_type']
+	feats=[]
+	if'cxx'in exts or'cpp'in exts or'c++'in exts or'cc'in exts or'C'in exts:
+		feats.append('cxx')
+	if'c'in exts or'vala'in exts:
+		feats.append('c')
+	if'd'in exts:
+		feats.append('d')
+	if'java'in exts:
+		feats.append('java')
+	if'java'in exts:
+		return'java'
+	if type in['program','shlib','stlib']:
+		for x in feats:
+			if x in['cxx','d','c']:
+				feats.append(x+type)
+	return feats
+def set_features(kw,_type):
+	kw['_type']=_type
+	kw['features']=Utils.to_list(kw.get('features',[]))+Utils.to_list(sniff_features(**kw))
+def program(bld,*k,**kw):
+	set_features(kw,'program')
+	return bld(*k,**kw)
+def shlib(bld,*k,**kw):
+	set_features(kw,'shlib')
+	return bld(*k,**kw)
+def stlib(bld,*k,**kw):
+	set_features(kw,'stlib')
+	return bld(*k,**kw)
+def objects(bld,*k,**kw):
+	set_features(kw,'objects')
+	return bld(*k,**kw)
+
+conf(program)
+conf(shlib)
+conf(stlib)
+conf(objects)
\ No newline at end of file
diff --git a/waflib/Tools/c_config.py b/waflib/Tools/c_config.py
new file mode 100644
index 0000000..d10e630
--- /dev/null
+++ b/waflib/Tools/c_config.py
@@ -0,0 +1,713 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import sys
+if sys.hexversion < 0x020400f0: from sets import Set as set
+import os,imp,sys,re,shlex,shutil
+from waflib import Build,Utils,Configure,Task,Options,Logs,TaskGen,Errors,ConfigSet,Runner
+from waflib.TaskGen import before_method,after_method,feature
+from waflib.Configure import conf
+WAF_CONFIG_H='config.h'
+DEFKEYS='define_key'
+INCKEYS='include_key'
+cfg_ver={'atleast-version':'>=','exact-version':'==','max-version':'<=',}
+SNIP_FUNCTION='''
+	int main() {
+	void *p;
+	p=(void*)(%s);
+	return 0;
+}
+'''
+SNIP_TYPE='''
+int main() {
+	if ((%(type_name)s *) 0) return 0;
+	if (sizeof (%(type_name)s)) return 0;
+}
+'''
+SNIP_CLASS='''
+int main() {
+	if (
+}
+'''
+SNIP_EMPTY_PROGRAM='''
+int main() {
+	return 0;
+}
+'''
+SNIP_FIELD='''
+int main() {
+	char *off;
+	off = (char*) &((%(type_name)s*)0)->%(field_name)s;
+	return (size_t) off < sizeof(%(type_name)s);
+}
+'''
+MACRO_TO_DESTOS={'__linux__':'linux','__GNU__':'gnu','__FreeBSD__':'freebsd','__NetBSD__':'netbsd','__OpenBSD__':'openbsd','__sun':'sunos','__hpux':'hpux','__sgi':'irix','_AIX':'aix','__CYGWIN__':'cygwin','__MSYS__':'msys','_UWIN':'uwin','_WIN64':'win32','_WIN32':'win32','__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__':'darwin','__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__':'darwin','__QNX__':'qnx','__native_client__':'nacl'}
+MACRO_TO_DEST_CPU={'__x86_64__':'x86_64','__i386__':'x86','__ia64__':'ia','__mips__':'mips','__sparc__':'sparc','__alpha__':'alpha','__arm__':'arm','__hppa__':'hppa','__powerpc__':'powerpc',}
+def parse_flags(self,line,uselib,env=None,force_static=False):
+	assert(isinstance(line,str))
+	env=env or self.env
+	app=env.append_value
+	appu=env.append_unique
+	lex=shlex.shlex(line,posix=False)
+	lex.whitespace_split=True
+	lex.commenters=''
+	lst=list(lex)
+	while lst:
+		x=lst.pop(0)
+		st=x[:2]
+		ot=x[2:]
+		if st=='-I'or st=='/I':
+			if not ot:ot=lst.pop(0)
+			appu('INCLUDES_'+uselib,[ot])
+		elif st=='-include':
+			tmp=[x,lst.pop(0)]
+			app('CFLAGS',tmp)
+			app('CXXFLAGS',tmp)
+		elif st=='-D'or(self.env.CXX_NAME=='msvc'and st=='/D'):
+			if not ot:ot=lst.pop(0)
+			app('DEFINES_'+uselib,[ot])
+		elif st=='-l':
+			if not ot:ot=lst.pop(0)
+			prefix=force_static and'STLIB_'or'LIB_'
+			appu(prefix+uselib,[ot])
+		elif st=='-L':
+			if not ot:ot=lst.pop(0)
+			appu('LIBPATH_'+uselib,[ot])
+		elif x=='-pthread'or x.startswith('+')or x.startswith('-std'):
+			app('CFLAGS_'+uselib,[x])
+			app('CXXFLAGS_'+uselib,[x])
+			app('LINKFLAGS_'+uselib,[x])
+		elif x=='-framework':
+			appu('FRAMEWORK_'+uselib,[lst.pop(0)])
+		elif x.startswith('-F'):
+			appu('FRAMEWORKPATH_'+uselib,[x[2:]])
+		elif x.startswith('-Wl'):
+			app('LINKFLAGS_'+uselib,[x])
+		elif x.startswith('-m')or x.startswith('-f')or x.startswith('-dynamic'):
+			app('CFLAGS_'+uselib,[x])
+			app('CXXFLAGS_'+uselib,[x])
+		elif x.startswith('-bundle'):
+			app('LINKFLAGS_'+uselib,[x])
+		elif x.startswith('-undefined'):
+			arg=lst.pop(0)
+			app('LINKFLAGS_'+uselib,[x,arg])
+		elif x.startswith('-arch')or x.startswith('-isysroot'):
+			tmp=[x,lst.pop(0)]
+			app('CFLAGS_'+uselib,tmp)
+			app('CXXFLAGS_'+uselib,tmp)
+			app('LINKFLAGS_'+uselib,tmp)
+		elif x.endswith('.a')or x.endswith('.so')or x.endswith('.dylib'):
+			appu('LINKFLAGS_'+uselib,[x])
+def ret_msg(self,f,kw):
+	if isinstance(f,str):
+		return f
+	return f(kw)
+def validate_cfg(self,kw):
+	if not'path'in kw:
+		if not self.env.PKGCONFIG:
+			self.find_program('pkg-config',var='PKGCONFIG')
+		kw['path']=self.env.PKGCONFIG
+	if'atleast_pkgconfig_version'in kw:
+		if not'msg'in kw:
+			kw['msg']='Checking for pkg-config version >= %r'%kw['atleast_pkgconfig_version']
+		return
+	if not'okmsg'in kw:
+		kw['okmsg']='yes'
+	if not'errmsg'in kw:
+		kw['errmsg']='not found'
+	if'modversion'in kw:
+		if not'msg'in kw:
+			kw['msg']='Checking for %r version'%kw['modversion']
+		return
+	for x in cfg_ver.keys():
+		y=x.replace('-','_')
+		if y in kw:
+			if not'package'in kw:
+				raise ValueError('%s requires a package'%x)
+			if not'msg'in kw:
+				kw['msg']='Checking for %r %s %s'%(kw['package'],cfg_ver[x],kw[y])
+			return
+	if not'msg'in kw:
+		kw['msg']='Checking for %r'%(kw['package']or kw['path'])
+def exec_cfg(self,kw):
+	if'atleast_pkgconfig_version'in kw:
+		cmd=[kw['path'],'--atleast-pkgconfig-version=%s'%kw['atleast_pkgconfig_version']]
+		self.cmd_and_log(cmd)
+		if not'okmsg'in kw:
+			kw['okmsg']='yes'
+		return
+	for x in cfg_ver:
+		y=x.replace('-','_')
+		if y in kw:
+			self.cmd_and_log([kw['path'],'--%s=%s'%(x,kw[y]),kw['package']])
+			if not'okmsg'in kw:
+				kw['okmsg']='yes'
+			self.define(self.have_define(kw.get('uselib_store',kw['package'])),1,0)
+			break
+	if'modversion'in kw:
+		version=self.cmd_and_log([kw['path'],'--modversion',kw['modversion']]).strip()
+		self.define('%s_VERSION'%Utils.quote_define_name(kw.get('uselib_store',kw['modversion'])),version)
+		return version
+	lst=[kw['path']]
+	defi=kw.get('define_variable',None)
+	if not defi:
+		defi=self.env.PKG_CONFIG_DEFINES or{}
+	for key,val in defi.items():
+		lst.append('--define-variable=%s=%s'%(key,val))
+	if kw['package']:
+		lst.extend(Utils.to_list(kw['package']))
+	if'variables'in kw:
+		env=kw.get('env',self.env)
+		uselib=kw.get('uselib_store',kw['package'].upper())
+		vars=Utils.to_list(kw['variables'])
+		for v in vars:
+			val=self.cmd_and_log(lst+['--variable='+v]).strip()
+			var='%s_%s'%(uselib,v)
+			env[var]=val
+		if not'okmsg'in kw:
+			kw['okmsg']='yes'
+		return
+	static=False
+	if'args'in kw:
+		args=Utils.to_list(kw['args'])
+		if'--static'in args or'--static-libs'in args:
+			static=True
+		lst+=args
+	ret=self.cmd_and_log(lst)
+	if not'okmsg'in kw:
+		kw['okmsg']='yes'
+	self.define(self.have_define(kw.get('uselib_store',kw['package'])),1,0)
+	self.parse_flags(ret,kw.get('uselib_store',kw['package'].upper()),kw.get('env',self.env),force_static=static)
+	return ret
+def check_cfg(self,*k,**kw):
+	if k:
+		lst=k[0].split()
+		kw['package']=lst[0]
+		kw['args']=' '.join(lst[1:])
+	self.validate_cfg(kw)
+	if'msg'in kw:
+		self.start_msg(kw['msg'])
+	ret=None
+	try:
+		ret=self.exec_cfg(kw)
+	except self.errors.WafError ,e:
+		if'errmsg'in kw:
+			self.end_msg(kw['errmsg'],'YELLOW')
+		if Logs.verbose>1:
+			raise
+		else:
+			self.fatal('The configuration failed')
+	else:
+		kw['success']=ret
+		if'okmsg'in kw:
+			self.end_msg(self.ret_msg(kw['okmsg'],kw))
+	return ret
+def validate_c(self,kw):
+	if not'env'in kw:
+		kw['env']=self.env.derive()
+	env=kw['env']
+	if not'compiler'in kw and not'features'in kw:
+		kw['compiler']='c'
+		if env['CXX_NAME']and Task.classes.get('cxx',None):
+			kw['compiler']='cxx'
+			if not self.env['CXX']:
+				self.fatal('a c++ compiler is required')
+		else:
+			if not self.env['CC']:
+				self.fatal('a c compiler is required')
+	if not'compile_mode'in kw:
+		kw['compile_mode']='c'
+		if'cxx'in Utils.to_list(kw.get('features',[]))or kw.get('compiler','')=='cxx':
+			kw['compile_mode']='cxx'
+	if not'type'in kw:
+		kw['type']='cprogram'
+	if not'features'in kw:
+		kw['features']=[kw['compile_mode'],kw['type']]
+	else:
+		kw['features']=Utils.to_list(kw['features'])
+	if not'compile_filename'in kw:
+		kw['compile_filename']='test.c'+((kw['compile_mode']=='cxx')and'pp'or'')
+	def to_header(dct):
+		if'header_name'in dct:
+			dct=Utils.to_list(dct['header_name'])
+			return''.join(['#include <%s>\n'%x for x in dct])
+		return''
+	if'framework_name'in kw:
+		fwkname=kw['framework_name']
+		if not'uselib_store'in kw:
+			kw['uselib_store']=fwkname.upper()
+		if not kw.get('no_header',False):
+			if not'header_name'in kw:
+				kw['header_name']=[]
+			fwk='%s/%s.h'%(fwkname,fwkname)
+			if kw.get('remove_dot_h',None):
+				fwk=fwk[:-2]
+			kw['header_name']=Utils.to_list(kw['header_name'])+[fwk]
+		kw['msg']='Checking for framework %s'%fwkname
+		kw['framework']=fwkname
+	if'function_name'in kw:
+		fu=kw['function_name']
+		if not'msg'in kw:
+			kw['msg']='Checking for function %s'%fu
+		kw['code']=to_header(kw)+SNIP_FUNCTION%fu
+		if not'uselib_store'in kw:
+			kw['uselib_store']=fu.upper()
+		if not'define_name'in kw:
+			kw['define_name']=self.have_define(fu)
+	elif'type_name'in kw:
+		tu=kw['type_name']
+		if not'header_name'in kw:
+			kw['header_name']='stdint.h'
+		if'field_name'in kw:
+			field=kw['field_name']
+			kw['code']=to_header(kw)+SNIP_FIELD%{'type_name':tu,'field_name':field}
+			if not'msg'in kw:
+				kw['msg']='Checking for field %s in %s'%(field,tu)
+			if not'define_name'in kw:
+				kw['define_name']=self.have_define((tu+'_'+field).upper())
+		else:
+			kw['code']=to_header(kw)+SNIP_TYPE%{'type_name':tu}
+			if not'msg'in kw:
+				kw['msg']='Checking for type %s'%tu
+			if not'define_name'in kw:
+				kw['define_name']=self.have_define(tu.upper())
+	elif'header_name'in kw:
+		if not'msg'in kw:
+			kw['msg']='Checking for header %s'%kw['header_name']
+		l=Utils.to_list(kw['header_name'])
+		assert len(l)>0,'list of headers in header_name is empty'
+		kw['code']=to_header(kw)+SNIP_EMPTY_PROGRAM
+		if not'uselib_store'in kw:
+			kw['uselib_store']=l[0].upper()
+		if not'define_name'in kw:
+			kw['define_name']=self.have_define(l[0])
+	if'lib'in kw:
+		if not'msg'in kw:
+			kw['msg']='Checking for library %s'%kw['lib']
+		if not'uselib_store'in kw:
+			kw['uselib_store']=kw['lib'].upper()
+	if'stlib'in kw:
+		if not'msg'in kw:
+			kw['msg']='Checking for static library %s'%kw['stlib']
+		if not'uselib_store'in kw:
+			kw['uselib_store']=kw['stlib'].upper()
+	if'fragment'in kw:
+		kw['code']=kw['fragment']
+		if not'msg'in kw:
+			kw['msg']='Checking for code snippet'
+		if not'errmsg'in kw:
+			kw['errmsg']='no'
+	for(flagsname,flagstype)in[('cxxflags','compiler'),('cflags','compiler'),('linkflags','linker')]:
+		if flagsname in kw:
+			if not'msg'in kw:
+				kw['msg']='Checking for %s flags %s'%(flagstype,kw[flagsname])
+			if not'errmsg'in kw:
+				kw['errmsg']='no'
+	if not'execute'in kw:
+		kw['execute']=False
+	if kw['execute']:
+		kw['features'].append('test_exec')
+	if not'errmsg'in kw:
+		kw['errmsg']='not found'
+	if not'okmsg'in kw:
+		kw['okmsg']='yes'
+	if not'code'in kw:
+		kw['code']=SNIP_EMPTY_PROGRAM
+	if self.env[INCKEYS]:
+		kw['code']='\n'.join(['#include <%s>'%x for x in self.env[INCKEYS]])+'\n'+kw['code']
+	if not kw.get('success'):kw['success']=None
+	if'define_name'in kw:
+		self.undefine(kw['define_name'])
+	assert'msg'in kw,'invalid parameters, read http://freehackers.org/~tnagy/wafbook/single.html#config_helpers_c'
+def post_check(self,*k,**kw):
+	is_success=0
+	if kw['execute']:
+		if kw['success']is not None:
+			if kw.get('define_ret',False):
+				is_success=kw['success']
+			else:
+				is_success=(kw['success']==0)
+	else:
+		is_success=(kw['success']==0)
+	if'define_name'in kw:
+		if'header_name'in kw or'function_name'in kw or'type_name'in kw or'fragment'in kw:
+			nm=kw['define_name']
+			if kw['execute']and kw.get('define_ret',None)and isinstance(is_success,str):
+				self.define(kw['define_name'],is_success,quote=kw.get('quote',1))
+			else:
+				self.define_cond(kw['define_name'],is_success)
+		else:
+			self.define_cond(kw['define_name'],is_success)
+	if'header_name'in kw:
+		if kw.get('auto_add_header_name',False):
+			self.env.append_value(INCKEYS,Utils.to_list(kw['header_name']))
+	if is_success and'uselib_store'in kw:
+		from waflib.Tools import ccroot
+		_vars=set([])
+		for x in kw['features']:
+			if x in ccroot.USELIB_VARS:
+				_vars|=ccroot.USELIB_VARS[x]
+		for k in _vars:
+			lk=k.lower()
+			if k=='INCLUDES':lk='includes'
+			if k=='DEFINES':lk='defines'
+			if lk in kw:
+				val=kw[lk]
+				if isinstance(val,str):
+					val=val.rstrip(os.path.sep)
+				self.env.append_unique(k+'_'+kw['uselib_store'],val)
+	return is_success
+def check(self,*k,**kw):
+	self.validate_c(kw)
+	self.start_msg(kw['msg'])
+	ret=None
+	try:
+		ret=self.run_c_code(*k,**kw)
+	except self.errors.ConfigurationError ,e:
+		self.end_msg(kw['errmsg'],'YELLOW')
+		if Logs.verbose>1:
+			raise
+		else:
+			self.fatal('The configuration failed')
+	else:
+		kw['success']=ret
+		self.end_msg(self.ret_msg(kw['okmsg'],kw))
+	ret=self.post_check(*k,**kw)
+	if not ret:
+		self.fatal('The configuration failed %r'%ret)
+	return ret
+class test_exec(Task.Task):
+	color='PINK'
+	def run(self):
+		if getattr(self.generator,'rpath',None):
+			if getattr(self.generator,'define_ret',False):
+				self.generator.bld.retval=self.generator.bld.cmd_and_log([self.inputs[0].abspath()])
+			else:
+				self.generator.bld.retval=self.generator.bld.exec_command([self.inputs[0].abspath()])
+		else:
+			env=self.env.env or{}
+			env.update(dict(os.environ))
+			for var in('LD_LIBRARY_PATH','DYLD_LIBRARY_PATH','PATH'):
+				env[var]=self.inputs[0].parent.abspath()+os.path.pathsep+env.get(var,'')
+			if getattr(self.generator,'define_ret',False):
+				self.generator.bld.retval=self.generator.bld.cmd_and_log([self.inputs[0].abspath()],env=env)
+			else:
+				self.generator.bld.retval=self.generator.bld.exec_command([self.inputs[0].abspath()],env=env)
+def test_exec_fun(self):
+	self.create_task('test_exec',self.link_task.outputs[0])
+CACHE_RESULTS=1
+COMPILE_ERRORS=2
+def run_c_code(self,*k,**kw):
+	lst=[str(v)for(p,v)in kw.items()if p!='env']
+	h=Utils.h_list(lst)
+	dir=self.bldnode.abspath()+os.sep+(not Utils.is_win32 and'.'or'')+'conf_check_'+Utils.to_hex(h)
+	try:
+		os.makedirs(dir)
+	except:
+		pass
+	try:
+		os.stat(dir)
+	except:
+		self.fatal('cannot use the configuration test folder %r'%dir)
+	cachemode=getattr(Options.options,'confcache',None)
+	if cachemode==CACHE_RESULTS:
+		try:
+			proj=ConfigSet.ConfigSet(os.path.join(dir,'cache_run_c_code'))
+			ret=proj['cache_run_c_code']
+		except:
+			pass
+		else:
+			if isinstance(ret,str)and ret.startswith('Test does not build'):
+				self.fatal(ret)
+			return ret
+	bdir=os.path.join(dir,'testbuild')
+	if not os.path.exists(bdir):
+		os.makedirs(bdir)
+	self.test_bld=bld=Build.BuildContext(top_dir=dir,out_dir=bdir)
+	bld.init_dirs()
+	bld.progress_bar=0
+	bld.targets='*'
+	if kw['compile_filename']:
+		node=bld.srcnode.make_node(kw['compile_filename'])
+		node.write(kw['code'])
+	bld.logger=self.logger
+	bld.all_envs.update(self.all_envs)
+	bld.env=kw['env']
+	o=bld(features=kw['features'],source=kw['compile_filename'],target='testprog')
+	for k,v in kw.items():
+		setattr(o,k,v)
+	self.to_log("==>\n%s\n<=="%kw['code'])
+	bld.targets='*'
+	ret=-1
+	try:
+		try:
+			bld.compile()
+		except Errors.WafError:
+			ret='Test does not build: %s'%Utils.ex_stack()
+			self.fatal(ret)
+		else:
+			ret=getattr(bld,'retval',0)
+	finally:
+		proj=ConfigSet.ConfigSet()
+		proj['cache_run_c_code']=ret
+		proj.store(os.path.join(dir,'cache_run_c_code'))
+	return ret
+def check_cxx(self,*k,**kw):
+	kw['compiler']='cxx'
+	return self.check(*k,**kw)
+def check_cc(self,*k,**kw):
+	kw['compiler']='c'
+	return self.check(*k,**kw)
+def define(self,key,val,quote=True):
+	assert key and isinstance(key,str)
+	if isinstance(val,int)or isinstance(val,float):
+		s='%s=%s'
+	else:
+		s=quote and'%s="%s"'or'%s=%s'
+	app=s%(key,str(val))
+	ban=key+'='
+	lst=self.env['DEFINES']
+	for x in lst:
+		if x.startswith(ban):
+			lst[lst.index(x)]=app
+			break
+	else:
+		self.env.append_value('DEFINES',app)
+	self.env.append_unique(DEFKEYS,key)
+def undefine(self,key):
+	assert key and isinstance(key,str)
+	ban=key+'='
+	lst=[x for x in self.env['DEFINES']if not x.startswith(ban)]
+	self.env['DEFINES']=lst
+	self.env.append_unique(DEFKEYS,key)
+def define_cond(self,key,val):
+	assert key and isinstance(key,str)
+	if val:
+		self.define(key,1)
+	else:
+		self.undefine(key)
+def is_defined(self,key):
+	assert key and isinstance(key,str)
+	ban=key+'='
+	for x in self.env['DEFINES']:
+		if x.startswith(ban):
+			return True
+	return False
+def get_define(self,key):
+	assert key and isinstance(key,str)
+	ban=key+'='
+	for x in self.env['DEFINES']:
+		if x.startswith(ban):
+			return x[len(ban):]
+	return None
+def have_define(self,key):
+	return self.__dict__.get('HAVE_PAT','HAVE_%s')%Utils.quote_define_name(key)
+def write_config_header(self,configfile='',guard='',top=False,env=None,defines=True,headers=False,remove=True):
+	if not configfile:configfile=WAF_CONFIG_H
+	waf_guard=guard or'_%s_WAF'%Utils.quote_define_name(configfile)
+	node=top and self.bldnode or self.path.get_bld()
+	node=node.make_node(configfile)
+	node.parent.mkdir()
+	lst=['/* WARNING! All changes made to this file will be lost! */\n']
+	lst.append('#ifndef %s\n#define %s\n'%(waf_guard,waf_guard))
+	lst.append(self.get_config_header(defines,headers))
+	lst.append('\n#endif /* %s */\n'%waf_guard)
+	node.write('\n'.join(lst))
+	env=env or self.env
+	env.append_unique(Build.CFG_FILES,[node.abspath()])
+	if remove:
+		for key in self.env[DEFKEYS]:
+			self.undefine(key)
+		self.env[DEFKEYS]=[]
+def get_config_header(self,defines=True,headers=False):
+	lst=[]
+	if headers:
+		for x in self.env[INCKEYS]:
+			lst.append('#include <%s>'%x)
+	if defines:
+		for x in self.env[DEFKEYS]:
+			if self.is_defined(x):
+				val=self.get_define(x)
+				lst.append('#define %s %s'%(x,val))
+			else:
+				lst.append('/* #undef %s */'%x)
+	return"\n".join(lst)
+def cc_add_flags(conf):
+	conf.add_os_flags('CPPFLAGS','CFLAGS')
+	conf.add_os_flags('CFLAGS')
+def cxx_add_flags(conf):
+	conf.add_os_flags('CPPFLAGS','CXXFLAGS')
+	conf.add_os_flags('CXXFLAGS')
+def link_add_flags(conf):
+	conf.add_os_flags('LINKFLAGS')
+	conf.add_os_flags('LDFLAGS','LINKFLAGS')
+def cc_load_tools(conf):
+	if not conf.env.DEST_OS:
+		conf.env.DEST_OS=Utils.unversioned_sys_platform()
+	conf.load('c')
+def cxx_load_tools(conf):
+	if not conf.env.DEST_OS:
+		conf.env.DEST_OS=Utils.unversioned_sys_platform()
+	conf.load('cxx')
+def get_cc_version(conf,cc,gcc=False,icc=False):
+	cmd=cc+['-dM','-E','-']
+	env=conf.env.env or None
+	try:
+		p=Utils.subprocess.Popen(cmd,stdin=Utils.subprocess.PIPE,stdout=Utils.subprocess.PIPE,stderr=Utils.subprocess.PIPE,env=env)
+		p.stdin.write('\n')
+		out=p.communicate()[0]
+	except:
+		conf.fatal('Could not determine the compiler version %r'%cmd)
+	if not isinstance(out,str):
+		out=out.decode(sys.stdout.encoding)
+	if gcc:
+		if out.find('__INTEL_COMPILER')>=0:
+			conf.fatal('The intel compiler pretends to be gcc')
+		if out.find('__GNUC__')<0:
+			conf.fatal('Could not determine the compiler type')
+	if icc and out.find('__INTEL_COMPILER')<0:
+		conf.fatal('Not icc/icpc')
+	k={}
+	if icc or gcc:
+		out=out.split('\n')
+		for line in out:
+			lst=shlex.split(line)
+			if len(lst)>2:
+				key=lst[1]
+				val=lst[2]
+				k[key]=val
+		def isD(var):
+			return var in k
+		def isT(var):
+			return var in k and k[var]!='0'
+		if not conf.env.DEST_OS:
+			conf.env.DEST_OS=''
+		for i in MACRO_TO_DESTOS:
+			if isD(i):
+				conf.env.DEST_OS=MACRO_TO_DESTOS[i]
+				break
+		else:
+			if isD('__APPLE__')and isD('__MACH__'):
+				conf.env.DEST_OS='darwin'
+			elif isD('__unix__'):
+				conf.env.DEST_OS='generic'
+		if isD('__ELF__'):
+			conf.env.DEST_BINFMT='elf'
+		elif isD('__WINNT__')or isD('__CYGWIN__'):
+			conf.env.DEST_BINFMT='pe'
+			conf.env.LIBDIR=conf.env['PREFIX']+'/bin'
+		elif isD('__APPLE__'):
+			conf.env.DEST_BINFMT='mac-o'
+		if not conf.env.DEST_BINFMT:
+			conf.env.DEST_BINFMT=Utils.destos_to_binfmt(conf.env.DEST_OS)
+		for i in MACRO_TO_DEST_CPU:
+			if isD(i):
+				conf.env.DEST_CPU=MACRO_TO_DEST_CPU[i]
+				break
+		Logs.debug('ccroot: dest platform: '+' '.join([conf.env[x]or'?'for x in('DEST_OS','DEST_BINFMT','DEST_CPU')]))
+		if icc:
+			ver=k['__INTEL_COMPILER']
+			conf.env['CC_VERSION']=(ver[:-2],ver[-2],ver[-1])
+		else:
+			conf.env['CC_VERSION']=(k['__GNUC__'],k['__GNUC_MINOR__'],k['__GNUC_PATCHLEVEL__'])
+	return k
+def get_xlc_version(conf,cc):
+	version_re=re.compile(r"IBM XL C/C\+\+.*, V(?P<major>\d*)\.(?P<minor>\d*)",re.I).search
+	cmd=cc+['-qversion']
+	try:
+		out,err=conf.cmd_and_log(cmd,output=0)
+	except Errors.WafError:
+		conf.fatal('Could not find xlc %r'%cmd)
+	if out:match=version_re(out)
+	else:match=version_re(err)
+	if not match:
+		conf.fatal('Could not determine the XLC version.')
+	k=match.groupdict()
+	conf.env['CC_VERSION']=(k['major'],k['minor'])
+def add_as_needed(self):
+	if self.env.DEST_BINFMT=='elf'and'gcc'in(self.env.CXX_NAME,self.env.CC_NAME):
+		self.env.append_unique('LINKFLAGS','--as-needed')
+class cfgtask(Task.TaskBase):
+	def display(self):
+		return''
+	def runnable_status(self):
+		return Task.RUN_ME
+	def run(self):
+		conf=self.conf
+		bld=Build.BuildContext(top_dir=conf.srcnode.abspath(),out_dir=conf.bldnode.abspath())
+		bld.env=conf.env
+		bld.init_dirs()
+		bld.in_msg=1
+		bld.logger=self.logger
+		try:
+			bld.check(**self.args)
+		except:
+			return 1
+def multicheck(self,*k,**kw):
+	self.start_msg(kw.get('msg','Executing %d configuration tests'%len(k)))
+	class par(object):
+		def __init__(self):
+			self.keep=False
+			self.cache_global=Options.cache_global
+			self.nocache=Options.options.nocache
+			self.returned_tasks=[]
+		def total(self):
+			return len(tasks)
+		def to_log(self,*k,**kw):
+			return
+	bld=par()
+	tasks=[]
+	for dct in k:
+		x=cfgtask(bld=bld)
+		tasks.append(x)
+		x.args=dct
+		x.bld=bld
+		x.conf=self
+		x.args=dct
+		x.logger=Logs.make_mem_logger(str(id(x)),self.logger)
+	def it():
+		yield tasks
+		while 1:
+			yield[]
+	p=Runner.Parallel(bld,Options.options.jobs)
+	p.biter=it()
+	p.start()
+	for x in tasks:
+		x.logger.memhandler.flush()
+	for x in tasks:
+		if x.hasrun!=Task.SUCCESS:
+			self.end_msg(kw.get('errmsg','no'),color='YELLOW')
+			self.fatal(kw.get('fatalmsg',None)or'One of the tests has failed, see the config.log for more information')
+	self.end_msg('ok')
+
+conf(parse_flags)
+conf(ret_msg)
+conf(validate_cfg)
+conf(exec_cfg)
+conf(check_cfg)
+conf(validate_c)
+conf(post_check)
+conf(check)
+feature('test_exec')(test_exec_fun)
+after_method('apply_link')(test_exec_fun)
+conf(run_c_code)
+conf(check_cxx)
+conf(check_cc)
+conf(define)
+conf(undefine)
+conf(define_cond)
+conf(is_defined)
+conf(get_define)
+conf(have_define)
+conf(write_config_header)
+conf(get_config_header)
+conf(cc_add_flags)
+conf(cxx_add_flags)
+conf(link_add_flags)
+conf(cc_load_tools)
+conf(cxx_load_tools)
+conf(get_cc_version)
+conf(get_xlc_version)
+conf(add_as_needed)
+conf(multicheck)
\ No newline at end of file
diff --git a/waflib/Tools/c_osx.py b/waflib/Tools/c_osx.py
new file mode 100644
index 0000000..92e39c5
--- /dev/null
+++ b/waflib/Tools/c_osx.py
@@ -0,0 +1,121 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os,shutil,sys,platform
+from waflib import TaskGen,Task,Build,Options,Utils,Errors
+from waflib.TaskGen import taskgen_method,feature,after_method,before_method
+app_info='''
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist SYSTEM "file://localhost/System/Library/DTDs/PropertyList.dtd">
+<plist version="0.9">
+<dict>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleGetInfoString</key>
+	<string>Created by Waf</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>NOTE</key>
+	<string>THIS IS A GENERATED FILE, DO NOT MODIFY</string>
+	<key>CFBundleExecutable</key>
+	<string>%s</string>
+</dict>
+</plist>
+'''
+def set_macosx_deployment_target(self):
+	if self.env['MACOSX_DEPLOYMENT_TARGET']:
+		os.environ['MACOSX_DEPLOYMENT_TARGET']=self.env['MACOSX_DEPLOYMENT_TARGET']
+	elif'MACOSX_DEPLOYMENT_TARGET'not in os.environ:
+		if Utils.unversioned_sys_platform()=='darwin':
+			os.environ['MACOSX_DEPLOYMENT_TARGET']='.'.join(platform.mac_ver()[0].split('.')[:2])
+def create_bundle_dirs(self,name,out):
+	bld=self.bld
+	dir=out.parent.find_or_declare(name)
+	dir.mkdir()
+	macos=dir.find_or_declare(['Contents','MacOS'])
+	macos.mkdir()
+	return dir
+def bundle_name_for_output(out):
+	name=out.name
+	k=name.rfind('.')
+	if k>=0:
+		name=name[:k]+'.app'
+	else:
+		name=name+'.app'
+	return name
+def create_task_macapp(self):
+	if self.env['MACAPP']or getattr(self,'mac_app',False):
+		out=self.link_task.outputs[0]
+		name=bundle_name_for_output(out)
+		dir=self.create_bundle_dirs(name,out)
+		n1=dir.find_or_declare(['Contents','MacOS',out.name])
+		self.apptask=self.create_task('macapp',self.link_task.outputs,n1)
+		inst_to=getattr(self,'install_path','/Applications')+'/%s/Contents/MacOS/'%name
+		self.bld.install_files(inst_to,n1,chmod=Utils.O755)
+		if getattr(self,'mac_resources',None):
+			res_dir=n1.parent.parent.make_node('Resources')
+			inst_to=getattr(self,'install_path','/Applications')+'/%s/Resources'%name
+			for x in self.to_list(self.mac_resources):
+				node=self.path.find_node(x)
+				if not node:
+					raise Errors.WafError('Missing mac_resource %r in %r'%(x,self))
+				parent=node.parent
+				if os.path.isdir(node.abspath()):
+					nodes=node.ant_glob('**')
+				else:
+					nodes=[node]
+				for node in nodes:
+					rel=node.path_from(parent)
+					tsk=self.create_task('macapp',node,res_dir.make_node(rel))
+					self.bld.install_as(inst_to+'/%s'%rel,node)
+		if getattr(self.bld,'is_install',None):
+			self.install_task.hasrun=Task.SKIP_ME
+def create_task_macplist(self):
+	if self.env['MACAPP']or getattr(self,'mac_app',False):
+		out=self.link_task.outputs[0]
+		name=bundle_name_for_output(out)
+		dir=self.create_bundle_dirs(name,out)
+		n1=dir.find_or_declare(['Contents','Info.plist'])
+		self.plisttask=plisttask=self.create_task('macplist',[],n1)
+		if getattr(self,'mac_plist',False):
+			node=self.path.find_resource(self.mac_plist)
+			if node:
+				plisttask.inputs.append(node)
+			else:
+				plisttask.code=self.mac_plist
+		else:
+			plisttask.code=app_info%self.link_task.outputs[0].name
+		inst_to=getattr(self,'install_path','/Applications')+'/%s/Contents/'%name
+		self.bld.install_files(inst_to,n1)
+def apply_bundle(self):
+	if self.env['MACBUNDLE']or getattr(self,'mac_bundle',False):
+		self.env['LINKFLAGS_cshlib']=self.env['LINKFLAGS_cxxshlib']=[]
+		self.env['cshlib_PATTERN']=self.env['cxxshlib_PATTERN']=self.env['macbundle_PATTERN']
+		use=self.use=self.to_list(getattr(self,'use',[]))
+		if not'MACBUNDLE'in use:
+			use.append('MACBUNDLE')
+app_dirs=['Contents','Contents/MacOS','Contents/Resources']
+class macapp(Task.Task):
+	color='PINK'
+	def run(self):
+		self.outputs[0].parent.mkdir()
+		shutil.copy2(self.inputs[0].srcpath(),self.outputs[0].abspath())
+class macplist(Task.Task):
+	color='PINK'
+	ext_in=['.bin']
+	def run(self):
+		if getattr(self,'code',None):
+			txt=self.code
+		else:
+			txt=self.inputs[0].read()
+		self.outputs[0].write(txt)
+
+feature('c','cxx')(set_macosx_deployment_target)
+taskgen_method(create_bundle_dirs)
+feature('cprogram','cxxprogram')(create_task_macapp)
+after_method('apply_link')(create_task_macapp)
+feature('cprogram','cxxprogram')(create_task_macplist)
+after_method('apply_link')(create_task_macplist)
+feature('cshlib','cxxshlib')(apply_bundle)
+before_method('apply_link','propagate_uselib_vars')(apply_bundle)
\ No newline at end of file
diff --git a/waflib/Tools/c_preproc.py b/waflib/Tools/c_preproc.py
new file mode 100644
index 0000000..4cb99ef
--- /dev/null
+++ b/waflib/Tools/c_preproc.py
@@ -0,0 +1,606 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import sys
+if sys.hexversion < 0x020400f0: from sets import Set as set
+import re,sys,os,string,traceback
+from waflib import Logs,Build,Utils,Errors
+from waflib.Logs import debug,error
+class PreprocError(Errors.WafError):
+	pass
+POPFILE='-'
+recursion_limit=150
+go_absolute=False
+standard_includes=['/usr/include']
+if Utils.is_win32:
+	standard_includes=[]
+use_trigraphs=0
+strict_quotes=0
+g_optrans={'not':'!','and':'&&','bitand':'&','and_eq':'&=','or':'||','bitor':'|','or_eq':'|=','xor':'^','xor_eq':'^=','compl':'~',}
+re_lines=re.compile('^[ \t]*(#|%:)[ \t]*(ifdef|ifndef|if|else|elif|endif|include|import|define|undef|pragma)[ \t]*(.*)\r*$',re.IGNORECASE|re.MULTILINE)
+re_mac=re.compile("^[a-zA-Z_]\w*")
+re_fun=re.compile('^[a-zA-Z_][a-zA-Z0-9_]*[(]')
+re_pragma_once=re.compile('^\s*once\s*',re.IGNORECASE)
+re_nl=re.compile('\\\\\r*\n',re.MULTILINE)
+re_cpp=re.compile(r"""(/\*[^*]*\*+([^/*][^*]*\*+)*/)|//[^\n]*|("(\\.|[^"\\])*"|'(\\.|[^'\\])*'|.[^/"'\\]*)""",re.MULTILINE)
+trig_def=[('??'+a,b)for a,b in zip("=-/!'()<>",r'#~\|^[]{}')]
+chr_esc={'0':0,'a':7,'b':8,'t':9,'n':10,'f':11,'v':12,'r':13,'\\':92,"'":39}
+NUM='i'
+OP='O'
+IDENT='T'
+STR='s'
+CHAR='c'
+tok_types=[NUM,STR,IDENT,OP]
+exp_types=[r"""0[xX](?P<hex>[a-fA-F0-9]+)(?P<qual1>[uUlL]*)|L*?'(?P<char>(\\.|[^\\'])+)'|(?P<n1>\d+)[Ee](?P<exp0>[+-]*?\d+)(?P<float0>[fFlL]*)|(?P<n2>\d*\.\d+)([Ee](?P<exp1>[+-]*?\d+))?(?P<float1>[fFlL]*)|(?P<n4>\d+\.\d*)([Ee](?P<exp2>[+-]*?\d+))?(?P<float2>[fFlL]*)|(?P<oct>0*)(?P<n0>\d+)(?P<qual2>[uUlL]*)""",r'L?"([^"\\]|\\.)*"',r'[a-zA-Z_]\w*',r'%:%:|<<=|>>=|\.\.\.|<<|<%|<:|<=|>>|>=|\+\+|\+=|--|->|-=|\*=|/=|%:|%=|%>|==|&&|&=|\|\||\|=|\^=|:>|!=|##|[\(\)\{\}\[\]<>\?\|\^\*\+&=:!#;,%/\-\?\~\.]',]
+re_clexer=re.compile('|'.join(["(?P<%s>%s)"%(name,part)for name,part in zip(tok_types,exp_types)]),re.M)
+accepted='a'
+ignored='i'
+undefined='u'
+skipped='s'
+def repl(m):
+	s=m.group(1)
+	if s:
+		return' '
+	return m.group(3)or''
+def filter_comments(filename):
+	code=Utils.readf(filename)
+	if use_trigraphs:
+		for(a,b)in trig_def:code=code.split(a).join(b)
+	code=re_nl.sub('',code)
+	code=re_cpp.sub(repl,code)
+	return[(m.group(2),m.group(3))for m in re.finditer(re_lines,code)]
+prec={}
+ops=['* / %','+ -','<< >>','< <= >= >','== !=','& | ^','&& ||',',']
+for x in range(len(ops)):
+	syms=ops[x]
+	for u in syms.split():
+		prec[u]=x
+def trimquotes(s):
+	if not s:return''
+	s=s.rstrip()
+	if s[0]=="'"and s[-1]=="'":return s[1:-1]
+	return s
+def reduce_nums(val_1,val_2,val_op):
+	try:a=0+val_1
+	except TypeError:a=int(val_1)
+	try:b=0+val_2
+	except TypeError:b=int(val_2)
+	d=val_op
+	if d=='%':c=a%b
+	elif d=='+':c=a+b
+	elif d=='-':c=a-b
+	elif d=='*':c=a*b
+	elif d=='/':c=a/b
+	elif d=='^':c=a^b
+	elif d=='|':c=a|b
+	elif d=='||':c=int(a or b)
+	elif d=='&':c=a&b
+	elif d=='&&':c=int(a and b)
+	elif d=='==':c=int(a==b)
+	elif d=='!=':c=int(a!=b)
+	elif d=='<=':c=int(a<=b)
+	elif d=='<':c=int(a<b)
+	elif d=='>':c=int(a>b)
+	elif d=='>=':c=int(a>=b)
+	elif d=='^':c=int(a^b)
+	elif d=='<<':c=a<<b
+	elif d=='>>':c=a>>b
+	else:c=0
+	return c
+def get_num(lst):
+	if not lst:raise PreprocError("empty list for get_num")
+	(p,v)=lst[0]
+	if p==OP:
+		if v=='(':
+			count_par=1
+			i=1
+			while i<len(lst):
+				(p,v)=lst[i]
+				if p==OP:
+					if v==')':
+						count_par-=1
+						if count_par==0:
+							break
+					elif v=='(':
+						count_par+=1
+				i+=1
+			else:
+				raise PreprocError("rparen expected %r"%lst)
+			(num,_)=get_term(lst[1:i])
+			return(num,lst[i+1:])
+		elif v=='+':
+			return get_num(lst[1:])
+		elif v=='-':
+			num,lst=get_num(lst[1:])
+			return(reduce_nums('-1',num,'*'),lst)
+		elif v=='!':
+			num,lst=get_num(lst[1:])
+			return(int(not int(num)),lst)
+		elif v=='~':
+			return(~int(num),lst)
+		else:
+			raise PreprocError("Invalid op token %r for get_num"%lst)
+	elif p==NUM:
+		return v,lst[1:]
+	elif p==IDENT:
+		return 0,lst[1:]
+	else:
+		raise PreprocError("Invalid token %r for get_num"%lst)
+def get_term(lst):
+	if not lst:raise PreprocError("empty list for get_term")
+	num,lst=get_num(lst)
+	if not lst:
+		return(num,[])
+	(p,v)=lst[0]
+	if p==OP:
+		if v=='&&'and not num:
+			return(num,[])
+		elif v=='||'and num:
+			return(num,[])
+		elif v==',':
+			return get_term(lst[1:])
+		elif v=='?':
+			count_par=0
+			i=1
+			while i<len(lst):
+				(p,v)=lst[i]
+				if p==OP:
+					if v==')':
+						count_par-=1
+					elif v=='(':
+						count_par+=1
+					elif v==':':
+						if count_par==0:
+							break
+				i+=1
+			else:
+				raise PreprocError("rparen expected %r"%lst)
+			if int(num):
+				return get_term(lst[1:i])
+			else:
+				return get_term(lst[i+1:])
+		else:
+			num2,lst=get_num(lst[1:])
+			if not lst:
+				num2=reduce_nums(num,num2,v)
+				return get_term([(NUM,num2)]+lst)
+			p2,v2=lst[0]
+			if p2!=OP:
+				raise PreprocError("op expected %r"%lst)
+			if prec[v2]>=prec[v]:
+				num2=reduce_nums(num,num2,v)
+				return get_term([(NUM,num2)]+lst)
+			else:
+				num3,lst=get_num(lst[1:])
+				num3=reduce_nums(num2,num3,v2)
+				return get_term([(NUM,num),(p,v),(NUM,num3)]+lst)
+	raise PreprocError("cannot reduce %r"%lst)
+def reduce_eval(lst):
+	num,lst=get_term(lst)
+	return(NUM,num)
+def stringize(lst):
+	lst=[str(v2)for(p2,v2)in lst]
+	return"".join(lst)
+def paste_tokens(t1,t2):
+	p1=None
+	if t1[0]==OP and t2[0]==OP:
+		p1=OP
+	elif t1[0]==IDENT and(t2[0]==IDENT or t2[0]==NUM):
+		p1=IDENT
+	elif t1[0]==NUM and t2[0]==NUM:
+		p1=NUM
+	if not p1:
+		raise PreprocError('tokens do not make a valid paste %r and %r'%(t1,t2))
+	return(p1,t1[1]+t2[1])
+def reduce_tokens(lst,defs,ban=[]):
+	i=0
+	while i<len(lst):
+		(p,v)=lst[i]
+		if p==IDENT and v=="defined":
+			del lst[i]
+			if i<len(lst):
+				(p2,v2)=lst[i]
+				if p2==IDENT:
+					if v2 in defs:
+						lst[i]=(NUM,1)
+					else:
+						lst[i]=(NUM,0)
+				elif p2==OP and v2=='(':
+					del lst[i]
+					(p2,v2)=lst[i]
+					del lst[i]
+					if v2 in defs:
+						lst[i]=(NUM,1)
+					else:
+						lst[i]=(NUM,0)
+				else:
+					raise PreprocError("Invalid define expression %r"%lst)
+		elif p==IDENT and v in defs:
+			if isinstance(defs[v],str):
+				a,b=extract_macro(defs[v])
+				defs[v]=b
+			macro_def=defs[v]
+			to_add=macro_def[1]
+			if isinstance(macro_def[0],list):
+				del lst[i]
+				for x in range(len(to_add)):
+					lst.insert(i,to_add[x])
+					i+=1
+			else:
+				args=[]
+				del lst[i]
+				if i>=len(lst):
+					raise PreprocError("expected '(' after %r (got nothing)"%v)
+				(p2,v2)=lst[i]
+				if p2!=OP or v2!='(':
+					raise PreprocError("expected '(' after %r"%v)
+				del lst[i]
+				one_param=[]
+				count_paren=0
+				while i<len(lst):
+					p2,v2=lst[i]
+					del lst[i]
+					if p2==OP and count_paren==0:
+						if v2=='(':
+							one_param.append((p2,v2))
+							count_paren+=1
+						elif v2==')':
+							if one_param:args.append(one_param)
+							break
+						elif v2==',':
+							if not one_param:raise PreprocError("empty param in funcall %s"%p)
+							args.append(one_param)
+							one_param=[]
+						else:
+							one_param.append((p2,v2))
+					else:
+						one_param.append((p2,v2))
+						if v2=='(':count_paren+=1
+						elif v2==')':count_paren-=1
+				else:
+					raise PreprocError('malformed macro')
+				accu=[]
+				arg_table=macro_def[0]
+				j=0
+				while j<len(to_add):
+					(p2,v2)=to_add[j]
+					if p2==OP and v2=='#':
+						if j+1<len(to_add)and to_add[j+1][0]==IDENT and to_add[j+1][1]in arg_table:
+							toks=args[arg_table[to_add[j+1][1]]]
+							accu.append((STR,stringize(toks)))
+							j+=1
+						else:
+							accu.append((p2,v2))
+					elif p2==OP and v2=='##':
+						if accu and j+1<len(to_add):
+							t1=accu[-1]
+							if to_add[j+1][0]==IDENT and to_add[j+1][1]in arg_table:
+								toks=args[arg_table[to_add[j+1][1]]]
+								if toks:
+									accu[-1]=paste_tokens(t1,toks[0])
+									accu.extend(toks[1:])
+								else:
+									accu.append((p2,v2))
+									accu.extend(toks)
+							elif to_add[j+1][0]==IDENT and to_add[j+1][1]=='__VA_ARGS__':
+								va_toks=[]
+								st=len(macro_def[0])
+								pt=len(args)
+								for x in args[pt-st+1:]:
+									va_toks.extend(x)
+									va_toks.append((OP,','))
+								if va_toks:va_toks.pop()
+								if len(accu)>1:
+									(p3,v3)=accu[-1]
+									(p4,v4)=accu[-2]
+									if v3=='##':
+										accu.pop()
+										if v4==','and pt<st:
+											accu.pop()
+								accu+=va_toks
+							else:
+								accu[-1]=paste_tokens(t1,to_add[j+1])
+							j+=1
+						else:
+							accu.append((p2,v2))
+					elif p2==IDENT and v2 in arg_table:
+						toks=args[arg_table[v2]]
+						reduce_tokens(toks,defs,ban+[v])
+						accu.extend(toks)
+					else:
+						accu.append((p2,v2))
+					j+=1
+				reduce_tokens(accu,defs,ban+[v])
+				for x in range(len(accu)-1,-1,-1):
+					lst.insert(i,accu[x])
+		i+=1
+def eval_macro(lst,defs):
+	reduce_tokens(lst,defs,[])
+	if not lst:raise PreprocError("missing tokens to evaluate")
+	(p,v)=reduce_eval(lst)
+	return int(v)!=0
+def extract_macro(txt):
+	t=tokenize(txt)
+	if re_fun.search(txt):
+		p,name=t[0]
+		p,v=t[1]
+		if p!=OP:raise PreprocError("expected open parenthesis")
+		i=1
+		pindex=0
+		params={}
+		prev='('
+		while 1:
+			i+=1
+			p,v=t[i]
+			if prev=='(':
+				if p==IDENT:
+					params[v]=pindex
+					pindex+=1
+					prev=p
+				elif p==OP and v==')':
+					break
+				else:
+					raise PreprocError("unexpected token (3)")
+			elif prev==IDENT:
+				if p==OP and v==',':
+					prev=v
+				elif p==OP and v==')':
+					break
+				else:
+					raise PreprocError("comma or ... expected")
+			elif prev==',':
+				if p==IDENT:
+					params[v]=pindex
+					pindex+=1
+					prev=p
+				elif p==OP and v=='...':
+					raise PreprocError("not implemented (1)")
+				else:
+					raise PreprocError("comma or ... expected (2)")
+			elif prev=='...':
+				raise PreprocError("not implemented (2)")
+			else:
+				raise PreprocError("unexpected else")
+		return(name,[params,t[i+1:]])
+	else:
+		(p,v)=t[0]
+		return(v,[[],t[1:]])
+re_include=re.compile('^\s*(<(?P<a>.*)>|"(?P<b>.*)")')
+def extract_include(txt,defs):
+	m=re_include.search(txt)
+	if m:
+		if m.group('a'):return'<',m.group('a')
+		if m.group('b'):return'"',m.group('b')
+	toks=tokenize(txt)
+	reduce_tokens(toks,defs,['waf_include'])
+	if not toks:
+		raise PreprocError("could not parse include %s"%txt)
+	if len(toks)==1:
+		if toks[0][0]==STR:
+			return'"',toks[0][1]
+	else:
+		if toks[0][1]=='<'and toks[-1][1]=='>':
+			return stringize(toks).lstrip('<').rstrip('>')
+	raise PreprocError("could not parse include %s."%txt)
+def parse_char(txt):
+	if not txt:raise PreprocError("attempted to parse a null char")
+	if txt[0]!='\\':
+		return ord(txt)
+	c=txt[1]
+	if c=='x':
+		if len(txt)==4 and txt[3]in string.hexdigits:return int(txt[2:],16)
+		return int(txt[2:],16)
+	elif c.isdigit():
+		if c=='0'and len(txt)==2:return 0
+		for i in 3,2,1:
+			if len(txt)>i and txt[1:1+i].isdigit():
+				return(1+i,int(txt[1:1+i],8))
+	else:
+		try:return chr_esc[c]
+		except KeyError:raise PreprocError("could not parse char literal '%s'"%txt)
+def tokenize(s):
+	ret=[]
+	for match in re_clexer.finditer(s):
+		m=match.group
+		for name in tok_types:
+			v=m(name)
+			if v:
+				if name==IDENT:
+					try:v=g_optrans[v];name=OP
+					except KeyError:
+						if v.lower()=="true":
+							v=1
+							name=NUM
+						elif v.lower()=="false":
+							v=0
+							name=NUM
+				elif name==NUM:
+					if m('oct'):v=int(v,8)
+					elif m('hex'):v=int(m('hex'),16)
+					elif m('n0'):v=m('n0')
+					else:
+						v=m('char')
+						if v:v=parse_char(v)
+						else:v=m('n2')or m('n4')
+				elif name==OP:
+					if v=='%:':v='#'
+					elif v=='%:%:':v='##'
+				elif name==STR:
+					v=v[1:-1]
+				ret.append((name,v))
+				break
+	return ret
+def define_name(line):
+	return re_mac.match(line).group(0)
+class c_parser(object):
+	def __init__(self,nodepaths=None,defines=None):
+		self.lines=[]
+		if defines is None:
+			self.defs={}
+		else:
+			self.defs=dict(defines)
+		self.state=[]
+		self.count_files=0
+		self.currentnode_stack=[]
+		self.nodepaths=nodepaths or[]
+		self.nodes=[]
+		self.names=[]
+		self.curfile=''
+		self.ban_includes=set([])
+	def cached_find_resource(self,node,filename):
+		try:
+			nd=node.ctx.cache_nd
+		except:
+			nd=node.ctx.cache_nd={}
+		tup=(node,filename)
+		try:
+			return nd[tup]
+		except KeyError:
+			ret=node.find_resource(filename)
+			if ret:
+				if getattr(ret,'children',None):
+					ret=None
+				elif ret.is_child_of(node.ctx.bldnode):
+					tmp=node.ctx.srcnode.search(ret.path_from(node.ctx.bldnode))
+					if tmp and getattr(tmp,'children',None):
+						ret=None
+			nd[tup]=ret
+			return ret
+	def tryfind(self,filename):
+		self.curfile=filename
+		found=self.cached_find_resource(self.currentnode_stack[-1],filename)
+		for n in self.nodepaths:
+			if found:
+				break
+			found=self.cached_find_resource(n,filename)
+		if found:
+			self.nodes.append(found)
+			if filename[-4:]!='.moc':
+				self.addlines(found)
+		else:
+			if not filename in self.names:
+				self.names.append(filename)
+		return found
+	def addlines(self,node):
+		self.currentnode_stack.append(node.parent)
+		filepath=node.abspath()
+		self.count_files+=1
+		if self.count_files>recursion_limit:
+			raise PreprocError("recursion limit exceeded")
+		pc=self.parse_cache
+		debug('preproc: reading file %r',filepath)
+		try:
+			lns=pc[filepath]
+		except KeyError:
+			pass
+		else:
+			self.lines.extend(lns)
+			return
+		try:
+			lines=filter_comments(filepath)
+			lines.append((POPFILE,''))
+			lines.reverse()
+			pc[filepath]=lines
+			self.lines.extend(lines)
+		except IOError:
+			raise PreprocError("could not read the file %s"%filepath)
+		except Exception:
+			if Logs.verbose>0:
+				error("parsing %s failed"%filepath)
+				traceback.print_exc()
+	def start(self,node,env):
+		debug('preproc: scanning %s (in %s)',node.name,node.parent.name)
+		bld=node.ctx
+		try:
+			self.parse_cache=bld.parse_cache
+		except AttributeError:
+			bld.parse_cache={}
+			self.parse_cache=bld.parse_cache
+		self.addlines(node)
+		if env['DEFINES']:
+			try:
+				lst=['%s %s'%(x[0],trimquotes('='.join(x[1:])))for x in[y.split('=')for y in env['DEFINES']]]
+				lst.reverse()
+				self.lines.extend([('define',x)for x in lst])
+			except AttributeError:
+				pass
+		while self.lines:
+			(token,line)=self.lines.pop()
+			if token==POPFILE:
+				self.count_files-=1
+				self.currentnode_stack.pop()
+				continue
+			try:
+				ve=Logs.verbose
+				if ve:debug('preproc: line is %s - %s state is %s',token,line,self.state)
+				state=self.state
+				if token[:2]=='if':
+					state.append(undefined)
+				elif token=='endif':
+					state.pop()
+				if token[0]!='e':
+					if skipped in self.state or ignored in self.state:
+						continue
+				if token=='if':
+					ret=eval_macro(tokenize(line),self.defs)
+					if ret:state[-1]=accepted
+					else:state[-1]=ignored
+				elif token=='ifdef':
+					m=re_mac.match(line)
+					if m and m.group(0)in self.defs:state[-1]=accepted
+					else:state[-1]=ignored
+				elif token=='ifndef':
+					m=re_mac.match(line)
+					if m and m.group(0)in self.defs:state[-1]=ignored
+					else:state[-1]=accepted
+				elif token=='include'or token=='import':
+					(kind,inc)=extract_include(line,self.defs)
+					if inc in self.ban_includes:
+						continue
+					if token=='import':self.ban_includes.add(inc)
+					if ve:debug('preproc: include found %s    (%s) ',inc,kind)
+					if kind=='"'or not strict_quotes:
+						self.tryfind(inc)
+				elif token=='elif':
+					if state[-1]==accepted:
+						state[-1]=skipped
+					elif state[-1]==ignored:
+						if eval_macro(tokenize(line),self.defs):
+							state[-1]=accepted
+				elif token=='else':
+					if state[-1]==accepted:state[-1]=skipped
+					elif state[-1]==ignored:state[-1]=accepted
+				elif token=='define':
+					try:
+						self.defs[define_name(line)]=line
+					except:
+						raise PreprocError("Invalid define line %s"%line)
+				elif token=='undef':
+					m=re_mac.match(line)
+					if m and m.group(0)in self.defs:
+						self.defs.__delitem__(m.group(0))
+				elif token=='pragma':
+					if re_pragma_once.match(line.lower()):
+						self.ban_includes.add(self.curfile)
+			except Exception ,e:
+				if Logs.verbose:
+					debug('preproc: line parsing failed (%s): %s %s',e,line,Utils.ex_stack())
+def scan(task):
+	global go_absolute
+	try:
+		incn=task.generator.includes_nodes
+	except AttributeError:
+		raise Errors.WafError('%r is missing a feature such as "c", "cxx" or "includes": '%task.generator)
+	if go_absolute:
+		nodepaths=incn+standard_includes
+	else:
+		nodepaths=[x for x in incn if x.is_child_of(x.ctx.srcnode)or x.is_child_of(x.ctx.bldnode)]
+	tmp=c_parser(nodepaths)
+	tmp.start(task.inputs[0],task.env)
+	if Logs.verbose:
+		debug('deps: deps for %r: %r; unresolved %r'%(task.inputs,tmp.nodes,tmp.names))
+	return(tmp.nodes,tmp.names)
+
+Utils.run_once(tokenize)
+Utils.run_once(define_name)
\ No newline at end of file
diff --git a/waflib/Tools/c_tests.py b/waflib/Tools/c_tests.py
new file mode 100644
index 0000000..30f92c5
--- /dev/null
+++ b/waflib/Tools/c_tests.py
@@ -0,0 +1,146 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+from waflib import Task
+from waflib.Configure import conf
+from waflib.TaskGen import feature,before_method,after_method
+import sys
+LIB_CODE='''
+#ifdef _MSC_VER
+#define testEXPORT __declspec(dllexport)
+#else
+#define testEXPORT
+#endif
+testEXPORT int lib_func(void) { return 9; }
+'''
+MAIN_CODE='''
+#ifdef _MSC_VER
+#define testEXPORT __declspec(dllimport)
+#else
+#define testEXPORT
+#endif
+testEXPORT int lib_func(void);
+int main(void) {return !(lib_func() == 9);}
+'''
+def link_lib_test_fun(self):
+	def write_test_file(task):
+		task.outputs[0].write(task.generator.code)
+	rpath=[]
+	if getattr(self,'add_rpath',False):
+		rpath=[self.bld.path.get_bld().abspath()]
+	mode=self.mode
+	m='%s %s'%(mode,mode)
+	ex=self.test_exec and'test_exec'or''
+	bld=self.bld
+	bld(rule=write_test_file,target='test.'+mode,code=LIB_CODE)
+	bld(rule=write_test_file,target='main.'+mode,code=MAIN_CODE)
+	bld(features='%sshlib'%m,source='test.'+mode,target='test')
+	bld(features='%sprogram %s'%(m,ex),source='main.'+mode,target='app',use='test',rpath=rpath)
+def check_library(self,mode=None,test_exec=True):
+	if not mode:
+		mode='c'
+		if self.env.CXX:
+			mode='cxx'
+	self.check(compile_filename=[],features='link_lib_test',msg='Checking for libraries',mode=mode,test_exec=test_exec,)
+INLINE_CODE='''
+typedef int foo_t;
+static %s foo_t static_foo () {return 0; }
+%s foo_t foo () {
+	return 0;
+}
+'''
+INLINE_VALUES=['inline','__inline__','__inline']
+def check_inline(self,**kw):
+	self.start_msg('Checking for inline')
+	if not'define_name'in kw:
+		kw['define_name']='INLINE_MACRO'
+	if not'features'in kw:
+		if self.env.CXX:
+			kw['features']=['cxx']
+		else:
+			kw['features']=['c']
+	for x in INLINE_VALUES:
+		kw['fragment']=INLINE_CODE%(x,x)
+		try:
+			self.check(**kw)
+		except self.errors.ConfigurationError:
+			continue
+		else:
+			self.end_msg(x)
+			if x!='inline':
+				self.define('inline',x,quote=False)
+			return x
+	self.fatal('could not use inline functions')
+LARGE_FRAGMENT='#include <unistd.h>\nint main() { return !(sizeof(off_t) >= 8); }\n'
+def check_large_file(self,**kw):
+	if not'define_name'in kw:
+		kw['define_name']='HAVE_LARGEFILE'
+	if not'execute'in kw:
+		kw['execute']=True
+	if not'features'in kw:
+		if self.env.CXX:
+			kw['features']=['cxx','cxxprogram']
+		else:
+			kw['features']=['c','cprogram']
+	kw['fragment']=LARGE_FRAGMENT
+	kw['msg']='Checking for large file support'
+	ret=True
+	try:
+		if self.env.DEST_BINFMT!='pe':
+			ret=self.check(**kw)
+	except self.errors.ConfigurationError:
+		pass
+	else:
+		if ret:
+			return True
+	kw['msg']='Checking for -D_FILE_OFFSET_BITS=64'
+	kw['defines']=['_FILE_OFFSET_BITS=64']
+	try:
+		ret=self.check(**kw)
+	except self.errors.ConfigurationError:
+		pass
+	else:
+		self.define('_FILE_OFFSET_BITS',64)
+		return ret
+	self.fatal('There is no support for large files')
+ENDIAN_FRAGMENT='''
+short int ascii_mm[] = { 0x4249, 0x4765, 0x6E44, 0x6961, 0x6E53, 0x7953, 0 };
+short int ascii_ii[] = { 0x694C, 0x5454, 0x656C, 0x6E45, 0x6944, 0x6E61, 0 };
+int use_ascii (int i) {
+	return ascii_mm[i] + ascii_ii[i];
+}
+short int ebcdic_ii[] = { 0x89D3, 0xE3E3, 0x8593, 0x95C5, 0x89C4, 0x9581, 0 };
+short int ebcdic_mm[] = { 0xC2C9, 0xC785, 0x95C4, 0x8981, 0x95E2, 0xA8E2, 0 };
+int use_ebcdic (int i) {
+	return ebcdic_mm[i] + ebcdic_ii[i];
+}
+extern int foo;
+'''
+class grep_for_endianness(Task.Task):
+	color='PINK'
+	def run(self):
+		txt=self.inputs[0].read(flags='rb').decode('iso8859-1')
+		if txt.find('LiTTleEnDian')>-1:
+			self.generator.tmp.append('little')
+		elif txt.find('BIGenDianSyS')>-1:
+			self.generator.tmp.append('big')
+		else:
+			return-1
+def grep_for_endianness_fun(self):
+	self.create_task('grep_for_endianness',self.compiled_tasks[0].outputs[0])
+def check_endianness(self):
+	tmp=[]
+	def check_msg(self):
+		return tmp[0]
+	self.check(fragment=ENDIAN_FRAGMENT,features='c grep_for_endianness',msg="Checking for endianness",define='ENDIANNESS',tmp=tmp,okmsg=check_msg)
+	return tmp[0]
+
+feature('link_lib_test')(link_lib_test_fun)
+before_method('process_source')(link_lib_test_fun)
+conf(check_library)
+conf(check_inline)
+conf(check_large_file)
+feature('grep_for_endianness')(grep_for_endianness_fun)
+after_method('process_source')(grep_for_endianness_fun)
+conf(check_endianness)
\ No newline at end of file
diff --git a/waflib/Tools/ccroot.py b/waflib/Tools/ccroot.py
new file mode 100644
index 0000000..e95f793
--- /dev/null
+++ b/waflib/Tools/ccroot.py
@@ -0,0 +1,375 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import sys
+if sys.hexversion < 0x020400f0: from sets import Set as set
+import os,sys,re
+from waflib import TaskGen,Task,Utils,Logs,Build,Options,Node,Errors
+from waflib.Logs import error,debug,warn
+from waflib.TaskGen import after_method,before_method,feature,taskgen_method,extension
+from waflib.Tools import c_aliases,c_preproc,c_config,c_osx,c_tests
+from waflib.Configure import conf
+USELIB_VARS=Utils.defaultdict(set)
+USELIB_VARS['c']=set(['INCLUDES','FRAMEWORKPATH','DEFINES','CPPFLAGS','CCDEPS','CFLAGS','ARCH'])
+USELIB_VARS['cxx']=set(['INCLUDES','FRAMEWORKPATH','DEFINES','CPPFLAGS','CXXDEPS','CXXFLAGS','ARCH'])
+USELIB_VARS['d']=set(['INCLUDES','DFLAGS'])
+USELIB_VARS['cprogram']=USELIB_VARS['cxxprogram']=set(['LIB','STLIB','LIBPATH','STLIBPATH','LINKFLAGS','RPATH','LINKDEPS','FRAMEWORK','FRAMEWORKPATH','ARCH'])
+USELIB_VARS['cshlib']=USELIB_VARS['cxxshlib']=set(['LIB','STLIB','LIBPATH','STLIBPATH','LINKFLAGS','RPATH','LINKDEPS','FRAMEWORK','FRAMEWORKPATH','ARCH'])
+USELIB_VARS['cstlib']=USELIB_VARS['cxxstlib']=set(['ARFLAGS','LINKDEPS'])
+USELIB_VARS['dprogram']=set(['LIB','STLIB','LIBPATH','STLIBPATH','LINKFLAGS','RPATH','LINKDEPS'])
+USELIB_VARS['dshlib']=set(['LIB','STLIB','LIBPATH','STLIBPATH','LINKFLAGS','RPATH','LINKDEPS'])
+USELIB_VARS['dstlib']=set(['ARFLAGS','LINKDEPS'])
+USELIB_VARS['go']=set(['GOCFLAGS'])
+USELIB_VARS['goprogram']=set(['GOLFLAGS'])
+USELIB_VARS['asm']=set(['ASFLAGS'])
+def create_compiled_task(self,name,node):
+	out='%s.%d.o'%(node.name,self.idx)
+	task=self.create_task(name,node,node.parent.find_or_declare(out))
+	try:
+		self.compiled_tasks.append(task)
+	except AttributeError:
+		self.compiled_tasks=[task]
+	return task
+def to_incnodes(self,inlst):
+	lst=[]
+	seen=set([])
+	for x in self.to_list(inlst):
+		if x in seen or not x:
+			continue
+		seen.add(x)
+		if isinstance(x,Node.Node):
+			lst.append(x)
+		else:
+			if os.path.isabs(x):
+				lst.append(self.bld.root.make_node(x)or x)
+			else:
+				if x[0]=='#':
+					p=self.bld.bldnode.make_node(x[1:])
+					v=self.bld.srcnode.make_node(x[1:])
+				else:
+					p=self.path.get_bld().make_node(x)
+					v=self.path.make_node(x)
+				if p.is_child_of(self.bld.bldnode):
+					p.mkdir()
+				lst.append(p)
+				lst.append(v)
+	return lst
+def apply_incpaths(self):
+	lst=self.to_incnodes(self.to_list(getattr(self,'includes',[]))+self.env['INCLUDES'])
+	self.includes_nodes=lst
+	self.env['INCPATHS']=[x.abspath()for x in lst]
+class link_task(Task.Task):
+	color='YELLOW'
+	inst_to=None
+	chmod=Utils.O644
+	def add_target(self,target):
+		if isinstance(target,str):
+			pattern=self.env[self.__class__.__name__+'_PATTERN']
+			if not pattern:
+				pattern='%s'
+			folder,name=os.path.split(target)
+			if self.__class__.__name__.find('shlib')>0:
+				if self.env.DEST_BINFMT=='pe'and getattr(self.generator,'vnum',None):
+					name=name+'-'+self.generator.vnum.split('.')[0]
+			tmp=folder+os.sep+pattern%name
+			target=self.generator.path.find_or_declare(tmp)
+		self.set_outputs(target)
+class stlink_task(link_task):
+	run_str='${AR} ${ARFLAGS} ${AR_TGT_F}${TGT} ${AR_SRC_F}${SRC}'
+def rm_tgt(cls):
+	old=cls.run
+	def wrap(self):
+		try:os.remove(self.outputs[0].abspath())
+		except OSError:pass
+		return old(self)
+	setattr(cls,'run',wrap)
+rm_tgt(stlink_task)
+def apply_link(self):
+	for x in self.features:
+		if x=='cprogram'and'cxx'in self.features:
+			x='cxxprogram'
+		elif x=='cshlib'and'cxx'in self.features:
+			x='cxxshlib'
+		if x in Task.classes:
+			if issubclass(Task.classes[x],link_task):
+				link=x
+				break
+	else:
+		return
+	objs=[t.outputs[0]for t in getattr(self,'compiled_tasks',[])]
+	self.link_task=self.create_task(link,objs)
+	self.link_task.add_target(self.target)
+	try:
+		inst_to=self.install_path
+	except AttributeError:
+		inst_to=self.link_task.__class__.inst_to
+	if inst_to:
+		self.install_task=self.bld.install_files(inst_to,self.link_task.outputs[:],env=self.env,chmod=self.link_task.chmod)
+def use_rec(self,name,**kw):
+	if name in self.tmp_use_not or name in self.tmp_use_seen:
+		return
+	try:
+		y=self.bld.get_tgen_by_name(name)
+	except Errors.WafError:
+		self.uselib.append(name)
+		self.tmp_use_not.add(name)
+		return
+	self.tmp_use_seen.append(name)
+	y.post()
+	y.tmp_use_objects=objects=kw.get('objects',True)
+	y.tmp_use_stlib=stlib=kw.get('stlib',True)
+	try:
+		link_task=y.link_task
+	except AttributeError:
+		y.tmp_use_var=''
+	else:
+		objects=False
+		if not isinstance(y.link_task,stlink_task):
+			stlib=False
+			y.tmp_use_var='LIB'
+		else:
+			y.tmp_use_var='STLIB'
+	p=self.tmp_use_prec
+	for x in self.to_list(getattr(y,'use',[])):
+		try:
+			p[x].append(name)
+		except:
+			p[x]=[name]
+		self.use_rec(x,objects=objects,stlib=stlib)
+def process_use(self):
+	use_not=self.tmp_use_not=set([])
+	use_seen=self.tmp_use_seen=[]
+	use_prec=self.tmp_use_prec={}
+	self.uselib=self.to_list(getattr(self,'uselib',[]))
+	self.includes=self.to_list(getattr(self,'includes',[]))
+	names=self.to_list(getattr(self,'use',[]))
+	for x in names:
+		self.use_rec(x)
+	for x in use_not:
+		if x in use_prec:
+			del use_prec[x]
+	out=[]
+	tmp=[]
+	for x in self.tmp_use_seen:
+		for k in use_prec.values():
+			if x in k:
+				break
+		else:
+			tmp.append(x)
+	while tmp:
+		e=tmp.pop()
+		out.append(e)
+		try:
+			nlst=use_prec[e]
+		except KeyError:
+			pass
+		else:
+			del use_prec[e]
+			for x in nlst:
+				for y in use_prec:
+					if x in use_prec[y]:
+						break
+				else:
+					tmp.append(x)
+	if use_prec:
+		raise Errors.WafError('Cycle detected in the use processing %r'%use_prec)
+	out.reverse()
+	link_task=getattr(self,'link_task',None)
+	for x in out:
+		y=self.bld.get_tgen_by_name(x)
+		var=y.tmp_use_var
+		if var and link_task:
+			if var=='LIB'or y.tmp_use_stlib:
+				self.env.append_value(var,[y.target[y.target.rfind(os.sep)+1:]])
+				self.link_task.dep_nodes.extend(y.link_task.outputs)
+				tmp_path=y.link_task.outputs[0].parent.path_from(self.bld.bldnode)
+				self.env.append_value(var+'PATH',[tmp_path])
+		else:
+			if y.tmp_use_objects:
+				self.add_objects_from_tgen(y)
+		if getattr(y,'export_includes',None):
+			self.includes.extend(y.to_incnodes(y.export_includes))
+	for x in names:
+		try:
+			y=self.bld.get_tgen_by_name(x)
+		except:
+			if not self.env['STLIB_'+x]and not x in self.uselib:
+				self.uselib.append(x)
+		else:
+			for k in self.to_list(getattr(y,'uselib',[])):
+				if not self.env['STLIB_'+k]and not k in self.uselib:
+					self.uselib.append(k)
+def add_objects_from_tgen(self,tg):
+	try:
+		link_task=self.link_task
+	except AttributeError:
+		pass
+	else:
+		for tsk in getattr(tg,'compiled_tasks',[]):
+			for x in tsk.outputs:
+				if x.name.endswith('.o')or x.name.endswith('.obj'):
+					link_task.inputs.append(x)
+def get_uselib_vars(self):
+	_vars=set([])
+	for x in self.features:
+		if x in USELIB_VARS:
+			_vars|=USELIB_VARS[x]
+	return _vars
+def propagate_uselib_vars(self):
+	_vars=self.get_uselib_vars()
+	env=self.env
+	for x in _vars:
+		y=x.lower()
+		env.append_unique(x,self.to_list(getattr(self,y,[])))
+	for x in self.features:
+		for var in _vars:
+			compvar='%s_%s'%(var,x)
+			env.append_value(var,env[compvar])
+	for x in self.to_list(getattr(self,'uselib',[])):
+		for v in _vars:
+			env.append_value(v,env[v+'_'+x])
+def apply_implib(self):
+	if not self.env.DEST_BINFMT=='pe':
+		return
+	dll=self.link_task.outputs[0]
+	if isinstance(self.target,Node.Node):
+		name=self.target.name
+	else:
+		name=os.path.split(self.target)[1]
+	implib=self.env['implib_PATTERN']%name
+	implib=dll.parent.find_or_declare(implib)
+	self.env.append_value('LINKFLAGS',self.env['IMPLIB_ST']%implib.bldpath())
+	self.link_task.outputs.append(implib)
+	if getattr(self,'defs',None)and self.env.DEST_BINFMT=='pe':
+		node=self.path.find_resource(self.defs)
+		if not node:
+			raise Errors.WafError('invalid def file %r'%self.defs)
+		if'msvc'in(self.env.CC_NAME,self.env.CXX_NAME):
+			self.env.append_value('LINKFLAGS','/def:%s'%node.path_from(self.bld.bldnode))
+			self.link_task.dep_nodes.append(node)
+		else:
+			self.link_task.inputs.append(node)
+	try:
+		inst_to=self.install_path
+	except AttributeError:
+		inst_to=self.link_task.__class__.inst_to
+	if not inst_to:
+		return
+	self.implib_install_task=self.bld.install_as('${PREFIX}/lib/%s'%implib.name,implib,self.env)
+def apply_vnum(self):
+	if not getattr(self,'vnum','')or os.name!='posix'or self.env.DEST_BINFMT not in('elf','mac-o'):
+		return
+	link=self.link_task
+	nums=self.vnum.split('.')
+	node=link.outputs[0]
+	libname=node.name
+	if libname.endswith('.dylib'):
+		name3=libname.replace('.dylib','.%s.dylib'%self.vnum)
+		name2=libname.replace('.dylib','.%s.dylib'%nums[0])
+	else:
+		name3=libname+'.'+self.vnum
+		name2=libname+'.'+nums[0]
+	if self.env.SONAME_ST:
+		v=self.env.SONAME_ST%name2
+		self.env.append_value('LINKFLAGS',v.split())
+	tsk=self.create_task('vnum',node,[node.parent.find_or_declare(name2),node.parent.find_or_declare(name3)])
+	if getattr(self.bld,'is_install',None):
+		self.install_task.hasrun=Task.SKIP_ME
+		bld=self.bld
+		path=self.install_task.dest
+		t1=bld.install_as(path+os.sep+name3,node,env=self.env,chmod=self.link_task.chmod)
+		t2=bld.symlink_as(path+os.sep+name2,name3)
+		t3=bld.symlink_as(path+os.sep+libname,name3)
+		self.vnum_install_task=(t1,t2,t3)
+	if'-dynamiclib'in self.env['LINKFLAGS']and getattr(self,'install_task',None):
+		path=os.path.join(self.install_task.get_install_path(),self.link_task.outputs[0].name)
+		self.env.append_value('LINKFLAGS',['-install_name',path])
+class vnum(Task.Task):
+	color='CYAN'
+	quient=True
+	ext_in=['.bin']
+	def run(self):
+		for x in self.outputs:
+			path=x.abspath()
+			try:
+				os.remove(path)
+			except OSError:
+				pass
+			try:
+				os.symlink(self.inputs[0].name,path)
+			except OSError:
+				return 1
+class fake_shlib(link_task):
+	def runnable_status(self):
+		for t in self.run_after:
+			if not t.hasrun:
+				return Task.ASK_LATER
+		for x in self.outputs:
+			x.sig=Utils.h_file(x.abspath())
+		return Task.SKIP_ME
+class fake_stlib(stlink_task):
+	def runnable_status(self):
+		for t in self.run_after:
+			if not t.hasrun:
+				return Task.ASK_LATER
+		for x in self.outputs:
+			x.sig=Utils.h_file(x.abspath())
+		return Task.SKIP_ME
+def read_shlib(self,name,paths=[]):
+	return self(name=name,features='fake_lib',lib_paths=paths,lib_type='shlib')
+def read_stlib(self,name,paths=[]):
+	return self(name=name,features='fake_lib',lib_paths=paths,lib_type='stlib')
+lib_patterns={'shlib':['lib%s.so','%s.so','lib%s.dll','%s.dll'],'stlib':['lib%s.a','%s.a','lib%s.dll','%s.dll','lib%s.lib','%s.lib'],}
+def process_lib(self):
+	node=None
+	names=[x%self.name for x in lib_patterns[self.lib_type]]
+	for x in self.lib_paths+[self.path,'/usr/lib64','/usr/lib','/usr/local/lib64','/usr/local/lib']:
+		if not isinstance(x,Node.Node):
+			x=self.bld.root.find_node(x)or self.path.find_node(x)
+			if not x:
+				continue
+		for y in names:
+			node=x.find_node(y)
+			if node:
+				node.sig=Utils.h_file(node.abspath())
+				break
+		else:
+			continue
+		break
+	else:
+		raise Errors.WafError('could not find library %r'%self.name)
+	self.link_task=self.create_task('fake_%s'%self.lib_type,[],[node])
+	self.target=self.name
+class fake_o(Task.Task):
+	def runnable_status(self):
+		return Task.SKIP_ME
+def add_those_o_files(self,node):
+	tsk=self.create_task('fake_o',[],node)
+	try:
+		self.compiled_tasks.append(tsk)
+	except AttributeError:
+		self.compiled_tasks=[tsk]
+
+taskgen_method(create_compiled_task)
+taskgen_method(to_incnodes)
+feature('c','cxx','d','go','asm','fc','includes')(apply_incpaths)
+after_method('propagate_uselib_vars','process_source')(apply_incpaths)
+feature('c','cxx','d','go','fc','asm')(apply_link)
+after_method('process_source')(apply_link)
+taskgen_method(use_rec)
+feature('c','cxx','d','use','fc')(process_use)
+before_method('apply_incpaths','propagate_uselib_vars')(process_use)
+after_method('apply_link','process_source')(process_use)
+taskgen_method(add_objects_from_tgen)
+taskgen_method(get_uselib_vars)
+feature('c','cxx','d','fc','javac','cs','uselib')(propagate_uselib_vars)
+after_method('process_use')(propagate_uselib_vars)
+feature('cshlib','cxxshlib','fcshlib')(apply_implib)
+after_method('apply_link')(apply_implib)
+feature('cshlib','cxxshlib','dshlib','fcshlib','vnum')(apply_vnum)
+after_method('apply_link')(apply_vnum)
+conf(read_shlib)
+conf(read_stlib)
+feature('fake_lib')(process_lib)
+extension('.o','.obj')(add_those_o_files)
\ No newline at end of file
diff --git a/waflib/Tools/compiler_c.py b/waflib/Tools/compiler_c.py
new file mode 100644
index 0000000..04504fa
--- /dev/null
+++ b/waflib/Tools/compiler_c.py
@@ -0,0 +1,39 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os,sys,imp,types
+from waflib.Tools import ccroot
+from waflib import Utils,Configure
+from waflib.Logs import debug
+c_compiler={'win32':['msvc','gcc'],'cygwin':['gcc'],'darwin':['gcc'],'aix':['xlc','gcc'],'linux':['gcc','icc'],'sunos':['suncc','gcc'],'irix':['gcc','irixcc'],'hpux':['gcc'],'gnu':['gcc'],'java':['gcc','msvc','icc'],'default':['gcc'],}
+def configure(conf):
+	try:test_for_compiler=conf.options.check_c_compiler
+	except AttributeError:conf.fatal("Add options(opt): opt.load('compiler_c')")
+	for compiler in test_for_compiler.split():
+		conf.env.stash()
+		conf.start_msg('Checking for %r (c compiler)'%compiler)
+		try:
+			conf.load(compiler)
+		except conf.errors.ConfigurationError ,e:
+			conf.env.revert()
+			conf.end_msg(False)
+			debug('compiler_c: %r'%e)
+		else:
+			if conf.env['CC']:
+				conf.end_msg(conf.env.get_flat('CC'))
+				conf.env['COMPILER_CC']=compiler
+				break
+			conf.end_msg(False)
+	else:
+		conf.fatal('could not configure a c compiler!')
+def options(opt):
+	opt.load_special_tools('c_*.py',ban=['c_dumbpreproc.py'])
+	global c_compiler
+	build_platform=Utils.unversioned_sys_platform()
+	possible_compiler_list=c_compiler[build_platform in c_compiler and build_platform or'default']
+	test_for_compiler=' '.join(possible_compiler_list)
+	cc_compiler_opts=opt.add_option_group("C Compiler Options")
+	cc_compiler_opts.add_option('--check-c-compiler',default="%s"%test_for_compiler,help='On this platform (%s) the following C-Compiler will be checked by default: "%s"'%(build_platform,test_for_compiler),dest="check_c_compiler")
+	for x in test_for_compiler.split():
+		opt.load('%s'%x)
diff --git a/waflib/Tools/compiler_cxx.py b/waflib/Tools/compiler_cxx.py
new file mode 100644
index 0000000..14b7c7d
--- /dev/null
+++ b/waflib/Tools/compiler_cxx.py
@@ -0,0 +1,39 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os,sys,imp,types
+from waflib.Tools import ccroot
+from waflib import Utils,Configure
+from waflib.Logs import debug
+cxx_compiler={'win32':['msvc','g++'],'cygwin':['g++'],'darwin':['g++'],'aix':['xlc++','g++'],'linux':['g++','icpc'],'sunos':['sunc++','g++'],'irix':['g++'],'hpux':['g++'],'gnu':['g++'],'java':['g++','msvc','icpc'],'default':['g++']}
+def configure(conf):
+	try:test_for_compiler=conf.options.check_cxx_compiler
+	except AttributeError:conf.fatal("Add options(opt): opt.load('compiler_cxx')")
+	for compiler in test_for_compiler.split():
+		conf.env.stash()
+		conf.start_msg('Checking for %r (c++ compiler)'%compiler)
+		try:
+			conf.load(compiler)
+		except conf.errors.ConfigurationError ,e:
+			conf.env.revert()
+			conf.end_msg(False)
+			debug('compiler_cxx: %r'%e)
+		else:
+			if conf.env['CXX']:
+				conf.end_msg(conf.env.get_flat('CXX'))
+				conf.env['COMPILER_CXX']=compiler
+				break
+			conf.end_msg(False)
+	else:
+		conf.fatal('could not configure a c++ compiler!')
+def options(opt):
+	opt.load_special_tools('cxx_*.py')
+	global cxx_compiler
+	build_platform=Utils.unversioned_sys_platform()
+	possible_compiler_list=cxx_compiler[build_platform in cxx_compiler and build_platform or'default']
+	test_for_compiler=' '.join(possible_compiler_list)
+	cxx_compiler_opts=opt.add_option_group('C++ Compiler Options')
+	cxx_compiler_opts.add_option('--check-cxx-compiler',default="%s"%test_for_compiler,help='On this platform (%s) the following C++ Compiler will be checked by default: "%s"'%(build_platform,test_for_compiler),dest="check_cxx_compiler")
+	for x in test_for_compiler.split():
+		opt.load('%s'%x)
diff --git a/waflib/Tools/compiler_d.py b/waflib/Tools/compiler_d.py
new file mode 100644
index 0000000..b5396b0
--- /dev/null
+++ b/waflib/Tools/compiler_d.py
@@ -0,0 +1,30 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os,sys,imp,types
+from waflib import Utils,Configure,Options,Logs
+def configure(conf):
+	for compiler in conf.options.dcheck.split(','):
+		conf.env.stash()
+		conf.start_msg('Checking for %r (d compiler)'%compiler)
+		try:
+			conf.load(compiler)
+		except conf.errors.ConfigurationError ,e:
+			conf.env.revert()
+			conf.end_msg(False)
+			Logs.debug('compiler_cxx: %r'%e)
+		else:
+			if conf.env.D:
+				conf.end_msg(conf.env.get_flat('D'))
+				conf.env['COMPILER_D']=compiler
+				conf.env.D_COMPILER=conf.env.D
+				break
+			conf.end_msg(False)
+	else:
+		conf.fatal('no suitable d compiler was found')
+def options(opt):
+	d_compiler_opts=opt.add_option_group('D Compiler Options')
+	d_compiler_opts.add_option('--check-d-compiler',default='gdc,dmd',action='store',help='check for the compiler [Default:gdc,dmd]',dest='dcheck')
+	for d_compiler in['gdc','dmd']:
+		opt.load('%s'%d_compiler)
diff --git a/waflib/Tools/compiler_fc.py b/waflib/Tools/compiler_fc.py
new file mode 100644
index 0000000..ec5d2ea
--- /dev/null
+++ b/waflib/Tools/compiler_fc.py
@@ -0,0 +1,43 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os,sys,imp,types
+from waflib import Utils,Configure,Options,Logs,Errors
+from waflib.Tools import fc
+fc_compiler={'win32':['gfortran','ifort'],'darwin':['gfortran','g95','ifort'],'linux':['gfortran','g95','ifort'],'java':['gfortran','g95','ifort'],'default':['gfortran'],'aix':['gfortran']}
+def __list_possible_compiler(platform):
+	try:
+		return fc_compiler[platform]
+	except KeyError:
+		return fc_compiler["default"]
+def configure(conf):
+	try:test_for_compiler=conf.options.check_fc
+	except AttributeError:conf.fatal("Add options(opt): opt.load('compiler_fc')")
+	for compiler in test_for_compiler.split():
+		conf.env.stash()
+		conf.start_msg('Checking for %r (fortran compiler)'%compiler)
+		try:
+			conf.load(compiler)
+		except conf.errors.ConfigurationError ,e:
+			conf.env.revert()
+			conf.end_msg(False)
+			Logs.debug('compiler_fortran: %r'%e)
+		else:
+			if conf.env['FC']:
+				conf.end_msg(conf.env.get_flat('FC'))
+				conf.env.COMPILER_FORTRAN=compiler
+				break
+			conf.end_msg(False)
+	else:
+		conf.fatal('could not configure a fortran compiler!')
+def options(opt):
+	opt.load_special_tools('fc_*.py')
+	build_platform=Utils.unversioned_sys_platform()
+	detected_platform=Options.platform
+	possible_compiler_list=__list_possible_compiler(detected_platform)
+	test_for_compiler=' '.join(possible_compiler_list)
+	fortran_compiler_opts=opt.add_option_group("Fortran Compiler Options")
+	fortran_compiler_opts.add_option('--check-fortran-compiler',default="%s"%test_for_compiler,help='On this platform (%s) the following Fortran Compiler will be checked by default: "%s"'%(detected_platform,test_for_compiler),dest="check_fc")
+	for compiler in test_for_compiler.split():
+		opt.load('%s'%compiler)
diff --git a/waflib/Tools/cs.py b/waflib/Tools/cs.py
new file mode 100644
index 0000000..0fdf761
--- /dev/null
+++ b/waflib/Tools/cs.py
@@ -0,0 +1,98 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import sys
+if sys.hexversion < 0x020400f0: from sets import Set as set
+from waflib import Utils,Task,Options,Logs,Errors
+from waflib.TaskGen import before_method,after_method,feature
+from waflib.Tools import ccroot
+from waflib.Configure import conf
+ccroot.USELIB_VARS['cs']=set(['CSFLAGS','ASSEMBLIES','RESOURCES'])
+ccroot.lib_patterns['csshlib']=['%s']
+def apply_cs(self):
+	cs_nodes=[]
+	no_nodes=[]
+	for x in self.to_nodes(self.source):
+		if x.name.endswith('.cs'):
+			cs_nodes.append(x)
+		else:
+			no_nodes.append(x)
+	self.source=no_nodes
+	bintype=getattr(self,'type',self.gen.endswith('.dll')and'library'or'exe')
+	self.cs_task=tsk=self.create_task('mcs',cs_nodes,self.path.find_or_declare(self.gen))
+	tsk.env.CSTYPE='/target:%s'%bintype
+	tsk.env.OUT='/out:%s'%tsk.outputs[0].abspath()
+	inst_to=getattr(self,'install_path',bintype=='exe'and'${BINDIR}'or'${LIBDIR}')
+	if inst_to:
+		mod=getattr(self,'chmod',bintype=='exe'and Utils.O755 or Utils.O644)
+		self.install_task=self.bld.install_files(inst_to,self.cs_task.outputs[:],env=self.env,chmod=mod)
+def use_cs(self):
+	names=self.to_list(getattr(self,'use',[]))
+	get=self.bld.get_tgen_by_name
+	for x in names:
+		try:
+			y=get(x)
+		except Errors.WafError:
+			self.cs_task.env.append_value('CSFLAGS','/reference:%s'%x)
+			continue
+		y.post()
+		tsk=getattr(y,'cs_task',None)or getattr(y,'link_task',None)
+		if not tsk:
+			self.bld.fatal('cs task has no link task for use %r'%self)
+		self.cs_task.dep_nodes.extend(tsk.outputs)
+		self.cs_task.set_run_after(tsk)
+		self.cs_task.env.append_value('CSFLAGS','/reference:%s'%tsk.outputs[0].abspath())
+def debug_cs(self):
+	csdebug=getattr(self,'csdebug',self.env.CSDEBUG)
+	if not csdebug:
+		return
+	node=self.cs_task.outputs[0]
+	if self.env.CS_NAME=='mono':
+		out=node.parent.find_or_declare(node.name+'.mdb')
+	else:
+		out=node.change_ext('.pdb')
+	self.cs_task.outputs.append(out)
+	try:
+		self.install_task.source.append(out)
+	except AttributeError:
+		pass
+	if csdebug=='pdbonly':
+		val=['/debug+','/debug:pdbonly']
+	elif csdebug=='full':
+		val=['/debug+','/debug:full']
+	else:
+		val=['/debug-']
+	self.cs_task.env.append_value('CSFLAGS',val)
+class mcs(Task.Task):
+	color='YELLOW'
+	run_str='${MCS} ${CSTYPE} ${CSFLAGS} ${ASS_ST:ASSEMBLIES} ${RES_ST:RESOURCES} ${OUT} ${SRC}'
+def configure(conf):
+	csc=getattr(Options.options,'cscbinary',None)
+	if csc:
+		conf.env.MCS=csc
+	conf.find_program(['csc','mcs','gmcs'],var='MCS')
+	conf.env.ASS_ST='/r:%s'
+	conf.env.RES_ST='/resource:%s'
+	conf.env.CS_NAME='csc'
+	if str(conf.env.MCS).lower().find('mcs')>-1:
+		conf.env.CS_NAME='mono'
+def options(opt):
+	opt.add_option('--with-csc-binary',type='string',dest='cscbinary')
+class fake_csshlib(Task.Task):
+	color='YELLOW'
+	inst_to=None
+	def runnable_status(self):
+		for x in self.outputs:
+			x.sig=Utils.h_file(x.abspath())
+		return Task.SKIP_ME
+def read_csshlib(self,name,paths=[]):
+	return self(name=name,features='fake_lib',lib_paths=paths,lib_type='csshlib')
+
+feature('cs')(apply_cs)
+before_method('process_source')(apply_cs)
+feature('cs')(use_cs)
+after_method('apply_cs')(use_cs)
+feature('cs')(debug_cs)
+after_method('apply_cs','use_cs')(debug_cs)
+conf(read_csshlib)
\ No newline at end of file
diff --git a/waflib/Tools/cxx.py b/waflib/Tools/cxx.py
new file mode 100644
index 0000000..e378383
--- /dev/null
+++ b/waflib/Tools/cxx.py
@@ -0,0 +1,27 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+from waflib import TaskGen,Task,Utils
+from waflib.Tools import c_preproc
+from waflib.Tools.ccroot import link_task,stlink_task
+def cxx_hook(self,node):
+	return self.create_compiled_task('cxx',node)
+TaskGen.extension('.cpp','.cc','.cxx','.C','.c++')(cxx_hook)
+if not'.c'in TaskGen.task_gen.mappings:
+	TaskGen.task_gen.mappings['.c']=TaskGen.task_gen.mappings['.cpp']
+class cxx(Task.Task):
+	run_str='${CXX} ${ARCH_ST:ARCH} ${CXXFLAGS} ${CPPFLAGS} ${FRAMEWORKPATH_ST:FRAMEWORKPATH} ${CPPPATH_ST:INCPATHS} ${DEFINES_ST:DEFINES} ${CXX_SRC_F}${SRC} ${CXX_TGT_F}${TGT}'
+	vars=['CXXDEPS']
+	ext_in=['.h']
+	scan=c_preproc.scan
+class cxxprogram(link_task):
+	run_str='${LINK_CXX} ${LINKFLAGS} ${CXXLNK_SRC_F}${SRC} ${CXXLNK_TGT_F}${TGT[0].abspath()} ${RPATH_ST:RPATH} ${FRAMEWORKPATH_ST:FRAMEWORKPATH} ${FRAMEWORK_ST:FRAMEWORK} ${ARCH_ST:ARCH} ${STLIB_MARKER} ${STLIBPATH_ST:STLIBPATH} ${STLIB_ST:STLIB} ${SHLIB_MARKER} ${LIBPATH_ST:LIBPATH} ${LIB_ST:LIB}'
+	vars=['LINKDEPS']
+	ext_out=['.bin']
+	inst_to='${BINDIR}'
+	chmod=Utils.O755
+class cxxshlib(cxxprogram):
+	inst_to='${LIBDIR}'
+class cxxstlib(stlink_task):
+	pass
diff --git a/waflib/Tools/d.py b/waflib/Tools/d.py
new file mode 100644
index 0000000..b56f3dd
--- /dev/null
+++ b/waflib/Tools/d.py
@@ -0,0 +1,56 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+from waflib import Utils,Task,Errors
+from waflib.TaskGen import taskgen_method,feature,extension
+from waflib.Tools import d_scan,d_config
+from waflib.Tools.ccroot import link_task,stlink_task
+class d(Task.Task):
+	color='GREEN'
+	run_str='${D} ${DFLAGS} ${DINC_ST:INCPATHS} ${D_SRC_F:SRC} ${D_TGT_F:TGT}'
+	scan=d_scan.scan
+class d_with_header(d):
+	run_str='${D} ${DFLAGS} ${DINC_ST:INCPATHS} ${D_HDR_F:tgt.outputs[1].bldpath()} ${D_SRC_F:SRC} ${D_TGT_F:tgt.outputs[0].bldpath()}'
+class d_header(Task.Task):
+	color='BLUE'
+	run_str='${D} ${D_HEADER} ${SRC}'
+class dprogram(link_task):
+	run_str='${D_LINKER} ${LINKFLAGS} ${DLNK_SRC_F}${SRC} ${DLNK_TGT_F:TGT} ${RPATH_ST:RPATH} ${DSTLIB_MARKER} ${DSTLIBPATH_ST:STLIBPATH} ${DSTLIB_ST:STLIB} ${DSHLIB_MARKER} ${DLIBPATH_ST:LIBPATH} ${DSHLIB_ST:LIB}'
+	inst_to='${BINDIR}'
+	chmod=Utils.O755
+class dshlib(dprogram):
+	inst_to='${LIBDIR}'
+class dstlib(stlink_task):
+	pass
+def d_hook(self,node):
+	ext=Utils.destos_to_binfmt(self.env.DEST_OS)=='pe'and'obj'or'o'
+	out='%s.%d.%s'%(node.name,self.idx,ext)
+	def create_compiled_task(self,name,node):
+		task=self.create_task(name,node,node.parent.find_or_declare(out))
+		try:
+			self.compiled_tasks.append(task)
+		except AttributeError:
+			self.compiled_tasks=[task]
+		return task
+	if getattr(self,'generate_headers',None):
+		tsk=create_compiled_task(self,'d_with_header',node)
+		tsk.outputs.append(node.change_ext(self.env['DHEADER_ext']))
+	else:
+		tsk=create_compiled_task(self,'d',node)
+	return tsk
+def generate_header(self,filename,install_path=None):
+	try:
+		self.header_lst.append([filename,install_path])
+	except AttributeError:
+		self.header_lst=[[filename,install_path]]
+def process_header(self):
+	for i in getattr(self,'header_lst',[]):
+		node=self.path.find_resource(i[0])
+		if not node:
+			raise Errors.WafError('file %r not found on d obj'%i[0])
+		self.create_task('d_header',node,node.change_ext('.di'))
+
+extension('.d','.di','.D')(d_hook)
+taskgen_method(generate_header)
+feature('d')(process_header)
\ No newline at end of file
diff --git a/waflib/Tools/d_config.py b/waflib/Tools/d_config.py
new file mode 100644
index 0000000..a61ac80
--- /dev/null
+++ b/waflib/Tools/d_config.py
@@ -0,0 +1,47 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+from waflib import Utils
+from waflib.Configure import conf
+def d_platform_flags(self):
+	v=self.env
+	if not v.DEST_OS:
+		v.DEST_OS=Utils.unversioned_sys_platform()
+	if Utils.destos_to_binfmt(self.env.DEST_OS)=='pe':
+		v['dprogram_PATTERN']='%s.exe'
+		v['dshlib_PATTERN']='lib%s.dll'
+		v['dstlib_PATTERN']='lib%s.a'
+	else:
+		v['dprogram_PATTERN']='%s'
+		v['dshlib_PATTERN']='lib%s.so'
+		v['dstlib_PATTERN']='lib%s.a'
+DLIB='''
+version(D_Version2) {
+	import std.stdio;
+	int main() {
+		writefln("phobos2");
+		return 0;
+	}
+} else {
+	version(Tango) {
+		import tango.stdc.stdio;
+		int main() {
+			printf("tango");
+			return 0;
+		}
+	} else {
+		import std.stdio;
+		int main() {
+			writefln("phobos1");
+			return 0;
+		}
+	}
+}
+'''
+def check_dlibrary(self):
+	ret=self.check_cc(features='d dprogram',fragment=DLIB,compile_filename='test.d',execute=True,define_ret=True)
+	self.env.DLIBRARY=ret.strip()
+
+conf(d_platform_flags)
+conf(check_dlibrary)
\ No newline at end of file
diff --git a/waflib/Tools/d_scan.py b/waflib/Tools/d_scan.py
new file mode 100644
index 0000000..ee80c5f
--- /dev/null
+++ b/waflib/Tools/d_scan.py
@@ -0,0 +1,133 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import re
+from waflib import Utils,Logs
+def filter_comments(filename):
+	txt=Utils.readf(filename)
+	i=0
+	buf=[]
+	max=len(txt)
+	begin=0
+	while i<max:
+		c=txt[i]
+		if c=='"'or c=="'":
+			buf.append(txt[begin:i])
+			delim=c
+			i+=1
+			while i<max:
+				c=txt[i]
+				if c==delim:break
+				elif c=='\\':
+					i+=1
+				i+=1
+			i+=1
+			begin=i
+		elif c=='/':
+			buf.append(txt[begin:i])
+			i+=1
+			if i==max:break
+			c=txt[i]
+			if c=='+':
+				i+=1
+				nesting=1
+				c=None
+				while i<max:
+					prev=c
+					c=txt[i]
+					if prev=='/'and c=='+':
+						nesting+=1
+						c=None
+					elif prev=='+'and c=='/':
+						nesting-=1
+						if nesting==0:break
+						c=None
+					i+=1
+			elif c=='*':
+				i+=1
+				c=None
+				while i<max:
+					prev=c
+					c=txt[i]
+					if prev=='*'and c=='/':break
+					i+=1
+			elif c=='/':
+				i+=1
+				while i<max and txt[i]!='\n':
+					i+=1
+			else:
+				begin=i-1
+				continue
+			i+=1
+			begin=i
+			buf.append(' ')
+		else:
+			i+=1
+	buf.append(txt[begin:])
+	return buf
+class d_parser(object):
+	def __init__(self,env,incpaths):
+		self.allnames=[]
+		self.re_module=re.compile("module\s+([^;]+)")
+		self.re_import=re.compile("import\s+([^;]+)")
+		self.re_import_bindings=re.compile("([^:]+):(.*)")
+		self.re_import_alias=re.compile("[^=]+=(.+)")
+		self.env=env
+		self.nodes=[]
+		self.names=[]
+		self.incpaths=incpaths
+	def tryfind(self,filename):
+		found=0
+		for n in self.incpaths:
+			found=n.find_resource(filename.replace('.','/')+'.d')
+			if found:
+				self.nodes.append(found)
+				self.waiting.append(found)
+				break
+		if not found:
+			if not filename in self.names:
+				self.names.append(filename)
+	def get_strings(self,code):
+		self.module=''
+		lst=[]
+		mod_name=self.re_module.search(code)
+		if mod_name:
+			self.module=re.sub('\s+','',mod_name.group(1))
+		import_iterator=self.re_import.finditer(code)
+		if import_iterator:
+			for import_match in import_iterator:
+				import_match_str=re.sub('\s+','',import_match.group(1))
+				bindings_match=self.re_import_bindings.match(import_match_str)
+				if bindings_match:
+					import_match_str=bindings_match.group(1)
+				matches=import_match_str.split(',')
+				for match in matches:
+					alias_match=self.re_import_alias.match(match)
+					if alias_match:
+						match=alias_match.group(1)
+					lst.append(match)
+		return lst
+	def start(self,node):
+		self.waiting=[node]
+		while self.waiting:
+			nd=self.waiting.pop(0)
+			self.iter(nd)
+	def iter(self,node):
+		path=node.abspath()
+		code="".join(filter_comments(path))
+		names=self.get_strings(code)
+		for x in names:
+			if x in self.allnames:continue
+			self.allnames.append(x)
+			self.tryfind(x)
+def scan(self):
+	env=self.env
+	gruik=d_parser(env,self.generator.includes_nodes)
+	node=self.inputs[0]
+	gruik.start(node)
+	nodes=gruik.nodes
+	names=gruik.names
+	if Logs.verbose:
+		Logs.debug('deps: deps for %s: %r; unresolved %r'%(str(node),nodes,names))
+	return(nodes,names)
diff --git a/waflib/Tools/dbus.py b/waflib/Tools/dbus.py
new file mode 100644
index 0000000..9204da8
--- /dev/null
+++ b/waflib/Tools/dbus.py
@@ -0,0 +1,30 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+from waflib import Task,Errors
+from waflib.TaskGen import taskgen_method,before_method
+def add_dbus_file(self,filename,prefix,mode):
+	if not hasattr(self,'dbus_lst'):
+		self.dbus_lst=[]
+	if not'process_dbus'in self.meths:
+		self.meths.append('process_dbus')
+	self.dbus_lst.append([filename,prefix,mode])
+def process_dbus(self):
+	for filename,prefix,mode in getattr(self,'dbus_lst',[]):
+		node=self.path.find_resource(filename)
+		if not node:
+			raise Errors.WafError('file not found '+filename)
+		tsk=self.create_task('dbus_binding_tool',node,node.change_ext('.h'))
+		tsk.env.DBUS_BINDING_TOOL_PREFIX=prefix
+		tsk.env.DBUS_BINDING_TOOL_MODE=mode
+class dbus_binding_tool(Task.Task):
+	color='BLUE'
+	ext_out=['.h']
+	run_str='${DBUS_BINDING_TOOL} --prefix=${DBUS_BINDING_TOOL_PREFIX} --mode=${DBUS_BINDING_TOOL_MODE} --output=${TGT} ${SRC}'
+	shell=True
+def configure(conf):
+	dbus_binding_tool=conf.find_program('dbus-binding-tool',var='DBUS_BINDING_TOOL')
+
+taskgen_method(add_dbus_file)
+before_method('apply_core')(process_dbus)
\ No newline at end of file
diff --git a/waflib/Tools/dmd.py b/waflib/Tools/dmd.py
new file mode 100644
index 0000000..7d3f7df
--- /dev/null
+++ b/waflib/Tools/dmd.py
@@ -0,0 +1,47 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import sys
+from waflib.Tools import ar,d
+from waflib.Configure import conf
+def find_dmd(conf):
+	conf.find_program(['dmd','ldc'],var='D')
+def common_flags_ldc(conf):
+	v=conf.env
+	v['DFLAGS']=['-d-version=Posix']
+	v['LINKFLAGS']=[]
+	v['DFLAGS_dshlib']=['-relocation-model=pic']
+def common_flags_dmd(conf):
+	v=conf.env
+	v['D_SRC_F']=['-c']
+	v['D_TGT_F']='-of%s'
+	v['D_LINKER']=v['D']
+	v['DLNK_SRC_F']=''
+	v['DLNK_TGT_F']='-of%s'
+	v['DINC_ST']='-I%s'
+	v['DSHLIB_MARKER']=v['DSTLIB_MARKER']=''
+	v['DSTLIB_ST']=v['DSHLIB_ST']='-L-l%s'
+	v['DSTLIBPATH_ST']=v['DLIBPATH_ST']='-L-L%s'
+	v['LINKFLAGS_dprogram']=['-quiet']
+	v['DFLAGS_dshlib']=['-fPIC']
+	v['LINKFLAGS_dshlib']=['-L-shared']
+	v['DHEADER_ext']='.di'
+	v.DFLAGS_d_with_header=['-H','-Hf']
+	v['D_HDR_F']='%s'
+def configure(conf):
+	conf.find_dmd()
+	if sys.platform=='win32':
+		out=conf.cmd_and_log([conf.env.D,'--help'])
+		if out.find("D Compiler v2.")>-1:
+			conf.fatal('dmd2 on Windows is not supported, use gdc or ldc instead')
+	conf.load('ar')
+	conf.load('d')
+	conf.common_flags_dmd()
+	conf.d_platform_flags()
+	if str(conf.env.D).find('ldc')>-1:
+		conf.common_flags_ldc()
+
+conf(find_dmd)
+conf(common_flags_ldc)
+conf(common_flags_dmd)
\ No newline at end of file
diff --git a/waflib/Tools/errcheck.py b/waflib/Tools/errcheck.py
new file mode 100644
index 0000000..93cb6c3
--- /dev/null
+++ b/waflib/Tools/errcheck.py
@@ -0,0 +1,161 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import sys
+if sys.hexversion < 0x020400f0: from sets import Set as set
+typos={'feature':'features','sources':'source','targets':'target','include':'includes','export_include':'export_includes','define':'defines','importpath':'includes','installpath':'install_path',}
+meths_typos=['__call__','program','shlib','stlib','objects']
+from waflib import Logs,Build,Node,Task,TaskGen,ConfigSet,Errors,Utils
+import waflib.Tools.ccroot
+def check_same_targets(self):
+	mp=Utils.defaultdict(list)
+	uids={}
+	def check_task(tsk):
+		if not isinstance(tsk,Task.Task):
+			return
+		for node in tsk.outputs:
+			mp[node].append(tsk)
+		try:
+			uids[tsk.uid()].append(tsk)
+		except:
+			uids[tsk.uid()]=[tsk]
+	for g in self.groups:
+		for tg in g:
+			try:
+				for tsk in tg.tasks:
+					check_task(tsk)
+			except AttributeError:
+				check_task(tg)
+	dupe=False
+	for(k,v)in mp.items():
+		if len(v)>1:
+			dupe=True
+			msg='* Node %r is created by more than once%s. The task generators are:'%(k,Logs.verbose==1 and" (full message on 'waf -v -v')"or"")
+			Logs.error(msg)
+			for x in v:
+				if Logs.verbose>1:
+					Logs.error('  %d. %r'%(1+v.index(x),x.generator))
+				else:
+					Logs.error('  %d. %r in %r'%(1+v.index(x),x.generator.name,getattr(x.generator,'path',None)))
+	if not dupe:
+		for(k,v)in uids.items():
+			if len(v)>1:
+				Logs.error('* Several tasks use the same identifier. Please check the information on\n   http://waf.googlecode.com/git/docs/apidocs/Task.html#waflib.Task.Task.uid')
+				for tsk in v:
+					Logs.error('  - object %r (%r) defined in %r'%(tsk.__class__.__name__,tsk,tsk.generator))
+def check_invalid_constraints(self):
+	feat=set([])
+	for x in list(TaskGen.feats.values()):
+		feat.union(set(x))
+	for(x,y)in TaskGen.task_gen.prec.items():
+		feat.add(x)
+		feat.union(set(y))
+	ext=set([])
+	for x in TaskGen.task_gen.mappings.values():
+		ext.add(x.__name__)
+	invalid=ext&feat
+	if invalid:
+		Logs.error('The methods %r have invalid annotations:  @extension <-> @feature/@before_method/@after_method'%list(invalid))
+	for cls in list(Task.classes.values()):
+		for x in('before','after'):
+			for y in Utils.to_list(getattr(cls,x,[])):
+				if not Task.classes.get(y,None):
+					Logs.error('Erroneous order constraint %r=%r on task class %r'%(x,y,cls.__name__))
+		if getattr(cls,'rule',None):
+			Logs.error('Erroneous attribute "rule" on task class %r (rename to "run_str")'%cls.__name__)
+def replace(m):
+	oldcall=getattr(Build.BuildContext,m)
+	def call(self,*k,**kw):
+		ret=oldcall(self,*k,**kw)
+		for x in typos:
+			if x in kw:
+				err=True
+				Logs.error('Fix the typo %r -> %r on %r'%(x,typos[x],ret))
+		return ret
+	setattr(Build.BuildContext,m,call)
+def enhance_lib():
+	for m in meths_typos:
+		replace(m)
+	def ant_glob(self,*k,**kw):
+		if k:
+			lst=Utils.to_list(k[0])
+			for pat in lst:
+				if'..'in pat.split('/'):
+					Logs.error("In ant_glob pattern %r: '..' means 'two dots', not 'parent directory'"%k[0])
+		if kw.get('remove',True):
+			try:
+				if self.is_child_of(self.ctx.bldnode)and not kw.get('quiet',False):
+					Logs.error('Using ant_glob on the build folder (%r) is dangerous (quiet=True to disable this warning)'%self)
+			except AttributeError:
+				pass
+		return self.old_ant_glob(*k,**kw)
+	Node.Node.old_ant_glob=Node.Node.ant_glob
+	Node.Node.ant_glob=ant_glob
+	old=Task.is_before
+	def is_before(t1,t2):
+		ret=old(t1,t2)
+		if ret and old(t2,t1):
+			Logs.error('Contradictory order constraints in classes %r %r'%(t1,t2))
+		return ret
+	Task.is_before=is_before
+	def check_err_features(self):
+		lst=self.to_list(self.features)
+		if'shlib'in lst:
+			Logs.error('feature shlib -> cshlib, dshlib or cxxshlib')
+		for x in('c','cxx','d','fc'):
+			if not x in lst and lst and lst[0]in[x+y for y in('program','shlib','stlib')]:
+				Logs.error('%r features is probably missing %r'%(self,x))
+	TaskGen.feature('*')(check_err_features)
+	def check_err_order(self):
+		if not hasattr(self,'rule'):
+			for x in('before','after','ext_in','ext_out'):
+				if hasattr(self,x):
+					Logs.warn('Erroneous order constraint %r on non-rule based task generator %r'%(x,self))
+		else:
+			for x in('before','after'):
+				for y in self.to_list(getattr(self,x,[])):
+					if not Task.classes.get(y,None):
+						Logs.error('Erroneous order constraint %s=%r on %r'%(x,y,self))
+	TaskGen.feature('*')(check_err_order)
+	def check_compile(self):
+		check_invalid_constraints(self)
+		try:
+			ret=self.orig_compile()
+		finally:
+			check_same_targets(self)
+		return ret
+	Build.BuildContext.orig_compile=Build.BuildContext.compile
+	Build.BuildContext.compile=check_compile
+	def use_rec(self,name,**kw):
+		try:
+			y=self.bld.get_tgen_by_name(name)
+		except Errors.WafError:
+			pass
+		else:
+			idx=self.bld.get_group_idx(self)
+			odx=self.bld.get_group_idx(y)
+			if odx>idx:
+				msg="Invalid 'use' across build groups:"
+				if Logs.verbose>1:
+					msg+='\n  target %r\n  uses:\n  %r'%(self,y)
+				else:
+					msg+=" %r uses %r (try 'waf -v -v' for the full error)"%(self.name,name)
+				raise Errors.WafError(msg)
+		self.orig_use_rec(name,**kw)
+	TaskGen.task_gen.orig_use_rec=TaskGen.task_gen.use_rec
+	TaskGen.task_gen.use_rec=use_rec
+	def getattri(self,name,default=None):
+		if name=='append'or name=='add':
+			raise Errors.WafError('env.append and env.add do not exist: use env.append_value/env.append_unique')
+		elif name=='prepend':
+			raise Errors.WafError('env.prepend does not exist: use env.prepend_value')
+		if name in self.__slots__:
+			return object.__getattr__(self,name,default)
+		else:
+			return self[name]
+	ConfigSet.ConfigSet.__getattr__=getattri
+def options(opt):
+	enhance_lib()
+def configure(conf):
+	pass
diff --git a/waflib/Tools/fc.py b/waflib/Tools/fc.py
new file mode 100644
index 0000000..30b1b48
--- /dev/null
+++ b/waflib/Tools/fc.py
@@ -0,0 +1,123 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import sys
+if sys.hexversion < 0x020400f0: from sets import Set as set
+import re
+from waflib import Utils,Task,TaskGen,Logs
+from waflib.Tools import ccroot,fc_config,fc_scan
+from waflib.TaskGen import feature,before_method,after_method,extension
+from waflib.Configure import conf
+ccroot.USELIB_VARS['fc']=set(['FCFLAGS','DEFINES','INCLUDES'])
+ccroot.USELIB_VARS['fcprogram_test']=ccroot.USELIB_VARS['fcprogram']=set(['LIB','STLIB','LIBPATH','STLIBPATH','LINKFLAGS','RPATH','LINKDEPS'])
+ccroot.USELIB_VARS['fcshlib']=set(['LIB','STLIB','LIBPATH','STLIBPATH','LINKFLAGS','RPATH','LINKDEPS'])
+ccroot.USELIB_VARS['fcstlib']=set(['ARFLAGS','LINKDEPS'])
+def dummy(self):
+	pass
+def fc_hook(self,node):
+	return self.create_compiled_task('fc',node)
+def modfile(conf,name):
+	return{'lower':name.lower()+'.mod','lower.MOD':name.upper()+'.MOD','UPPER.mod':name.upper()+'.mod','UPPER':name.upper()+'.MOD'}[conf.env.FC_MOD_CAPITALIZATION or'lower']
+def get_fortran_tasks(tsk):
+	bld=tsk.generator.bld
+	tasks=bld.get_tasks_group(bld.get_group_idx(tsk.generator))
+	return[x for x in tasks if isinstance(x,fc)and not getattr(x,'nomod',None)and not getattr(x,'mod_fortran_done',None)]
+class fc(Task.Task):
+	color='GREEN'
+	run_str='${FC} ${FCFLAGS} ${FCINCPATH_ST:INCPATHS} ${FCDEFINES_ST:DEFINES} ${_FCMODOUTFLAGS} ${FC_TGT_F}${TGT[0].abspath()} ${FC_SRC_F}${SRC[0].abspath()}'
+	vars=["FORTRANMODPATHFLAG"]
+	def scan(self):
+		tmp=fc_scan.fortran_parser(self.generator.includes_nodes)
+		tmp.task=self
+		tmp.start(self.inputs[0])
+		if Logs.verbose:
+			Logs.debug('deps: deps for %r: %r; unresolved %r'%(self.inputs,tmp.nodes,tmp.names))
+		return(tmp.nodes,tmp.names)
+	def runnable_status(self):
+		if getattr(self,'mod_fortran_done',None):
+			return super(fc,self).runnable_status()
+		bld=self.generator.bld
+		lst=get_fortran_tasks(self)
+		for tsk in lst:
+			tsk.mod_fortran_done=True
+		for tsk in lst:
+			ret=tsk.runnable_status()
+			if ret==Task.ASK_LATER:
+				for x in lst:
+					x.mod_fortran_done=None
+				return Task.ASK_LATER
+		ins=Utils.defaultdict(set)
+		outs=Utils.defaultdict(set)
+		for tsk in lst:
+			key=tsk.uid()
+			for x in bld.raw_deps[key]:
+				if x.startswith('MOD@'):
+					name=bld.modfile(x.replace('MOD@',''))
+					node=bld.srcnode.find_or_declare(name)
+					tsk.set_outputs(node)
+					outs[id(node)].add(tsk)
+		for tsk in lst:
+			key=tsk.uid()
+			for x in bld.raw_deps[key]:
+				if x.startswith('USE@'):
+					name=bld.modfile(x.replace('USE@',''))
+					node=bld.srcnode.find_resource(name)
+					if node and node not in tsk.outputs:
+						if not node in bld.node_deps[key]:
+							bld.node_deps[key].append(node)
+						ins[id(node)].add(tsk)
+		for k in ins.keys():
+			for a in ins[k]:
+				a.run_after.update(outs[k])
+				tmp=[]
+				for t in outs[k]:
+					tmp.extend(t.outputs)
+				a.dep_nodes.extend(tmp)
+				try:
+					a.dep_nodes.sort(key=lambda x:x.abspath())
+				except:
+					a.dep_nodes.sort(lambda x,y:cmp(x.abspath(),y.abspath()))
+		for tsk in lst:
+			try:
+				delattr(tsk,'cache_sig')
+			except AttributeError:
+				pass
+		return super(fc,self).runnable_status()
+class fcprogram(ccroot.link_task):
+	color='YELLOW'
+	run_str='${FC} ${LINKFLAGS} ${FCLNK_SRC_F}${SRC} ${FCLNK_TGT_F}${TGT[0].abspath()} ${RPATH_ST:RPATH} ${FCSTLIB_MARKER} ${FCSTLIBPATH_ST:STLIBPATH} ${FCSTLIB_ST:STLIB} ${FCSHLIB_MARKER} ${FCLIBPATH_ST:LIBPATH} ${FCLIB_ST:LIB}'
+	inst_to='${BINDIR}'
+	chmod=Utils.O755
+class fcshlib(fcprogram):
+	inst_to='${LIBDIR}'
+class fcprogram_test(fcprogram):
+	def can_retrieve_cache(self):
+		return False
+	def runnable_status(self):
+		ret=super(fcprogram_test,self).runnable_status()
+		if ret==Task.SKIP_ME:
+			ret=Task.RUN_ME
+		return ret
+	def exec_command(self,cmd,**kw):
+		bld=self.generator.bld
+		kw['shell']=isinstance(cmd,str)
+		kw['stdout']=kw['stderr']=Utils.subprocess.PIPE
+		kw['cwd']=bld.variant_dir
+		bld.out=bld.err=''
+		bld.to_log('command: %s\n'%cmd)
+		kw['output']=0
+		try:
+			(bld.out,bld.err)=bld.cmd_and_log(cmd,**kw)
+		except Exception ,e:
+			return-1
+		if bld.out:
+			bld.to_log("out: %s\n"%bld.out)
+		if bld.err:
+			bld.to_log("err: %s\n"%bld.err)
+class fcstlib(ccroot.stlink_task):
+	pass
+
+feature('fcprogram','fcshlib','fcstlib','fcprogram_test')(dummy)
+extension('.f','.f90','.F','.F90','.for','.FOR')(fc_hook)
+conf(modfile)
\ No newline at end of file
diff --git a/waflib/Tools/fc_config.py b/waflib/Tools/fc_config.py
new file mode 100644
index 0000000..f9c97fa
--- /dev/null
+++ b/waflib/Tools/fc_config.py
@@ -0,0 +1,283 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import re,shutil,os,sys,string,shlex
+from waflib.Configure import conf
+from waflib.TaskGen import feature,after_method,before_method
+from waflib import Build,Utils
+FC_FRAGMENT='        program main\n        end     program main\n'
+FC_FRAGMENT2='        PROGRAM MAIN\n        END\n'
+def fc_flags(conf):
+	v=conf.env
+	v['FC_SRC_F']=[]
+	v['FC_TGT_F']=['-c','-o']
+	v['FCINCPATH_ST']='-I%s'
+	v['FCDEFINES_ST']='-D%s'
+	if not v['LINK_FC']:v['LINK_FC']=v['FC']
+	v['FCLNK_SRC_F']=[]
+	v['FCLNK_TGT_F']=['-o']
+	v['FCFLAGS_fcshlib']=['-fpic']
+	v['LINKFLAGS_fcshlib']=['-shared']
+	v['fcshlib_PATTERN']='lib%s.so'
+	v['fcstlib_PATTERN']='lib%s.a'
+	v['FCLIB_ST']='-l%s'
+	v['FCLIBPATH_ST']='-L%s'
+	v['FCSTLIB_ST']='-l%s'
+	v['FCSTLIBPATH_ST']='-L%s'
+	v['FCSTLIB_MARKER']='-Wl,-Bstatic'
+	v['FCSHLIB_MARKER']='-Wl,-Bdynamic'
+	v['SONAME_ST']='-Wl,-h,%s'
+def check_fortran(self,*k,**kw):
+	self.check_cc(fragment=FC_FRAGMENT,compile_filename='test.f',features='fc fcprogram',msg='Compiling a simple fortran app')
+def check_fc(self,*k,**kw):
+	kw['compiler']='fc'
+	if not'compile_mode'in kw:
+		kw['compile_mode']='fc'
+	if not'type'in kw:
+		kw['type']='fcprogram'
+	if not'compile_filename'in kw:
+		kw['compile_filename']='test.f90'
+	if not'code'in kw:
+		kw['code']=FC_FRAGMENT
+	return self.check(*k,**kw)
+def fortran_modifier_darwin(conf):
+	v=conf.env
+	v['FCFLAGS_fcshlib']=['-fPIC','-compatibility_version','1','-current_version','1']
+	v['LINKFLAGS_fcshlib']=['-dynamiclib']
+	v['fcshlib_PATTERN']='lib%s.dylib'
+	v['FRAMEWORKPATH_ST']='-F%s'
+	v['FRAMEWORK_ST']='-framework %s'
+	v['LINKFLAGS_fcstlib']=[]
+	v['FCSHLIB_MARKER']=''
+	v['FCSTLIB_MARKER']=''
+	v['SONAME_ST']=''
+def fortran_modifier_win32(conf):
+	v=conf.env
+	v['fcprogram_PATTERN']=v['fcprogram_test_PATTERN']='%s.exe'
+	v['fcshlib_PATTERN']='%s.dll'
+	v['implib_PATTERN']='lib%s.dll.a'
+	v['IMPLIB_ST']='-Wl,--out-implib,%s'
+	v['FCFLAGS_fcshlib']=[]
+	v.append_value('FCFLAGS_fcshlib',['-DDLL_EXPORT'])
+	v.append_value('LINKFLAGS',['-Wl,--enable-auto-import'])
+def fortran_modifier_cygwin(conf):
+	fortran_modifier_win32(conf)
+	v=conf.env
+	v['fcshlib_PATTERN']='cyg%s.dll'
+	v.append_value('LINKFLAGS_fcshlib',['-Wl,--enable-auto-image-base'])
+	v['FCFLAGS_fcshlib']=[]
+def check_fortran_dummy_main(self,*k,**kw):
+	if not self.env.CC:
+		self.fatal('A c compiler is required for check_fortran_dummy_main')
+	lst=['MAIN__','__MAIN','_MAIN','MAIN_','MAIN']
+	lst.extend([m.lower()for m in lst])
+	lst.append('')
+	self.start_msg('Detecting whether we need a dummy main')
+	for main in lst:
+		kw['fortran_main']=main
+		try:
+			self.check_cc(fragment='int %s() { return 0; }\n'%(main or'test'),features='c fcprogram',mandatory=True)
+			if not main:
+				self.env.FC_MAIN=-1
+				self.end_msg('no')
+			else:
+				self.env.FC_MAIN=main
+				self.end_msg('yes %s'%main)
+			break
+		except self.errors.ConfigurationError:
+			pass
+	else:
+		self.end_msg('not found')
+		self.fatal('could not detect whether fortran requires a dummy main, see the config.log')
+GCC_DRIVER_LINE=re.compile('^Driving:')
+POSIX_STATIC_EXT=re.compile('\S+\.a')
+POSIX_LIB_FLAGS=re.compile('-l\S+')
+def is_link_verbose(self,txt):
+	assert isinstance(txt,str)
+	for line in txt.splitlines():
+		if not GCC_DRIVER_LINE.search(line):
+			if POSIX_STATIC_EXT.search(line)or POSIX_LIB_FLAGS.search(line):
+				return True
+	return False
+def check_fortran_verbose_flag(self,*k,**kw):
+	self.start_msg('fortran link verbose flag')
+	for x in['-v','--verbose','-verbose','-V']:
+		try:
+			self.check_cc(features='fc fcprogram_test',fragment=FC_FRAGMENT2,compile_filename='test.f',linkflags=[x],mandatory=True)
+		except self.errors.ConfigurationError:
+			pass
+		else:
+			if self.is_link_verbose(self.test_bld.err)or self.is_link_verbose(self.test_bld.out):
+				self.end_msg(x)
+				break
+	else:
+		self.end_msg('failure')
+		self.fatal('Could not obtain the fortran link verbose flag (see config.log)')
+	self.env.FC_VERBOSE_FLAG=x
+	return x
+LINKFLAGS_IGNORED=[r'-lang*',r'-lcrt[a-zA-Z0-9\.]*\.o',r'-lc$',r'-lSystem',r'-libmil',r'-LIST:*',r'-LNO:*']
+if os.name=='nt':
+	LINKFLAGS_IGNORED.extend([r'-lfrt*',r'-luser32',r'-lkernel32',r'-ladvapi32',r'-lmsvcrt',r'-lshell32',r'-lmingw',r'-lmoldname'])
+else:
+	LINKFLAGS_IGNORED.append(r'-lgcc*')
+RLINKFLAGS_IGNORED=[re.compile(f)for f in LINKFLAGS_IGNORED]
+def _match_ignore(line):
+	for i in RLINKFLAGS_IGNORED:
+		if i.match(line):
+			return True
+	return False
+def parse_fortran_link(lines):
+	final_flags=[]
+	for line in lines:
+		if not GCC_DRIVER_LINE.match(line):
+			_parse_flink_line(line,final_flags)
+	return final_flags
+SPACE_OPTS=re.compile('^-[LRuYz]$')
+NOSPACE_OPTS=re.compile('^-[RL]')
+def _parse_flink_line(line,final_flags):
+	lexer=shlex.shlex(line,posix=True)
+	lexer.whitespace_split=True
+	t=lexer.get_token()
+	tmp_flags=[]
+	while t:
+		def parse(token):
+			if _match_ignore(token):
+				pass
+			elif token.startswith('-lkernel32')and sys.platform=='cygwin':
+				tmp_flags.append(token)
+			elif SPACE_OPTS.match(token):
+				t=lexer.get_token()
+				if t.startswith('P,'):
+					t=t[2:]
+				for opt in t.split(os.pathsep):
+					tmp_flags.append('-L%s'%opt)
+			elif NOSPACE_OPTS.match(token):
+				tmp_flags.append(token)
+			elif POSIX_LIB_FLAGS.match(token):
+				tmp_flags.append(token)
+			else:
+				pass
+			t=lexer.get_token()
+			return t
+		t=parse(t)
+	final_flags.extend(tmp_flags)
+	return final_flags
+def check_fortran_clib(self,autoadd=True,*k,**kw):
+	if not self.env.FC_VERBOSE_FLAG:
+		self.fatal('env.FC_VERBOSE_FLAG is not set: execute check_fortran_verbose_flag?')
+	self.start_msg('Getting fortran runtime link flags')
+	try:
+		self.check_cc(fragment=FC_FRAGMENT2,compile_filename='test.f',features='fc fcprogram_test',linkflags=[self.env.FC_VERBOSE_FLAG])
+	except:
+		self.end_msg(False)
+		if kw.get('mandatory',True):
+			conf.fatal('Could not find the c library flags')
+	else:
+		out=self.test_bld.err
+		flags=parse_fortran_link(out.splitlines())
+		self.end_msg('ok (%s)'%' '.join(flags))
+		self.env.LINKFLAGS_CLIB=flags
+		return flags
+	return[]
+def getoutput(conf,cmd,stdin=False):
+	if stdin:
+		stdin=Utils.subprocess.PIPE
+	else:
+		stdin=None
+	env=conf.env.env or None
+	try:
+		p=Utils.subprocess.Popen(cmd,stdin=stdin,stdout=Utils.subprocess.PIPE,stderr=Utils.subprocess.PIPE,env=env)
+		if stdin:
+			p.stdin.write('\n')
+		stdout,stderr=p.communicate()
+	except:
+		conf.fatal('could not determine the compiler version %r'%cmd)
+	else:
+		if not isinstance(stdout,str):
+			stdout=stdout.decode(sys.stdout.encoding)
+		if not isinstance(stderr,str):
+			stderr=stderr.decode(sys.stdout.encoding)
+		return stdout,stderr
+ROUTINES_CODE="""\
+      subroutine foobar()
+      return
+      end
+      subroutine foo_bar()
+      return
+      end
+"""
+MAIN_CODE="""
+void %(dummy_func_nounder)s(void);
+void %(dummy_func_under)s(void);
+int %(main_func_name)s() {
+  %(dummy_func_nounder)s();
+  %(dummy_func_under)s();
+  return 0;
+}
+"""
+def link_main_routines_tg_method(self):
+	def write_test_file(task):
+		task.outputs[0].write(task.generator.code)
+	bld=self.bld
+	bld(rule=write_test_file,target='main.c',code=MAIN_CODE%self.__dict__)
+	bld(rule=write_test_file,target='test.f',code=ROUTINES_CODE)
+	bld(features='fc fcstlib',source='test.f',target='test')
+	bld(features='c fcprogram',source='main.c',target='app',use='test')
+def mangling_schemes():
+	for u in['_','']:
+		for du in['','_']:
+			for c in["lower","upper"]:
+				yield(u,du,c)
+def mangle_name(u,du,c,name):
+	return getattr(name,c)()+u+(name.find('_')!=-1 and du or'')
+def check_fortran_mangling(self,*k,**kw):
+	if not self.env.CC:
+		self.fatal('A c compiler is required for link_main_routines')
+	if not self.env.FC:
+		self.fatal('A fortran compiler is required for link_main_routines')
+	if not self.env.FC_MAIN:
+		self.fatal('Checking for mangling requires self.env.FC_MAIN (execute "check_fortran_dummy_main" first?)')
+	self.start_msg('Getting fortran mangling scheme')
+	for(u,du,c)in mangling_schemes():
+		try:
+			self.check_cc(compile_filename=[],features='link_main_routines_func',msg='nomsg',errmsg='nomsg',mandatory=True,dummy_func_nounder=mangle_name(u,du,c,"foobar"),dummy_func_under=mangle_name(u,du,c,"foo_bar"),main_func_name=self.env.FC_MAIN)
+		except self.errors.ConfigurationError:
+			pass
+		else:
+			self.end_msg("ok ('%s', '%s', '%s-case')"%(u,du,c))
+			self.env.FORTRAN_MANGLING=(u,du,c)
+			break
+	else:
+		self.end_msg(False)
+		self.fatal('mangler not found')
+	return(u,du,c)
+def set_lib_pat(self):
+	self.env['fcshlib_PATTERN']=self.env['pyext_PATTERN']
+def detect_openmp(self):
+	for x in['-fopenmp','-openmp','-mp','-xopenmp','-omp','-qsmp=omp']:
+		try:
+			self.check_fc(msg='Checking for OpenMP flag %s'%x,fragment='program main\n  call omp_get_num_threads()\nend program main',fcflags=x,linkflags=x,uselib_store='OPENMP')
+		except self.errors.ConfigurationError:
+			pass
+		else:
+			break
+	else:
+		self.fatal('Could not find OpenMP')
+
+conf(fc_flags)
+conf(check_fortran)
+conf(check_fc)
+conf(fortran_modifier_darwin)
+conf(fortran_modifier_win32)
+conf(fortran_modifier_cygwin)
+conf(check_fortran_dummy_main)
+conf(is_link_verbose)
+conf(check_fortran_verbose_flag)
+conf(check_fortran_clib)
+feature('link_main_routines_func')(link_main_routines_tg_method)
+before_method('process_source')(link_main_routines_tg_method)
+conf(check_fortran_mangling)
+feature('pyext')(set_lib_pat)
+before_method('propagate_uselib_vars','apply_link')(set_lib_pat)
+conf(detect_openmp)
\ No newline at end of file
diff --git a/waflib/Tools/fc_scan.py b/waflib/Tools/fc_scan.py
new file mode 100644
index 0000000..48e06b5
--- /dev/null
+++ b/waflib/Tools/fc_scan.py
@@ -0,0 +1,68 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import re
+from waflib import Utils,Task,TaskGen,Logs
+from waflib.TaskGen import feature,before_method,after_method,extension
+from waflib.Configure import conf
+INC_REGEX="""(?:^|['">]\s*;)\s*INCLUDE\s+(?:\w+_)?[<"'](.+?)(?=["'>])"""
+USE_REGEX="""(?:^|;)\s*USE(?:\s+|(?:(?:\s*,\s*(?:NON_)?INTRINSIC)?\s*::))\s*(\w+)"""
+MOD_REGEX="""(?:^|;)\s*MODULE(?!\s*PROCEDURE)(?:\s+|(?:(?:\s*,\s*(?:NON_)?INTRINSIC)?\s*::))\s*(\w+)"""
+re_inc=re.compile(INC_REGEX,re.I)
+re_use=re.compile(USE_REGEX,re.I)
+re_mod=re.compile(MOD_REGEX,re.I)
+class fortran_parser(object):
+	def __init__(self,incpaths):
+		self.seen=[]
+		self.nodes=[]
+		self.names=[]
+		self.incpaths=incpaths
+	def find_deps(self,node):
+		txt=node.read()
+		incs=[]
+		uses=[]
+		mods=[]
+		for line in txt.splitlines():
+			m=re_inc.search(line)
+			if m:
+				incs.append(m.group(1))
+			m=re_use.search(line)
+			if m:
+				uses.append(m.group(1))
+			m=re_mod.search(line)
+			if m:
+				mods.append(m.group(1))
+		return(incs,uses,mods)
+	def start(self,node):
+		self.waiting=[node]
+		while self.waiting:
+			nd=self.waiting.pop(0)
+			self.iter(nd)
+	def iter(self,node):
+		path=node.abspath()
+		incs,uses,mods=self.find_deps(node)
+		for x in incs:
+			if x in self.seen:
+				continue
+			self.seen.append(x)
+			self.tryfind_header(x)
+		for x in uses:
+			name="USE@%s"%x
+			if not name in self.names:
+				self.names.append(name)
+		for x in mods:
+			name="MOD@%s"%x
+			if not name in self.names:
+				self.names.append(name)
+	def tryfind_header(self,filename):
+		found=None
+		for n in self.incpaths:
+			found=n.find_resource(filename)
+			if found:
+				self.nodes.append(found)
+				self.waiting.append(found)
+				break
+		if not found:
+			if not filename in self.names:
+				self.names.append(filename)
diff --git a/waflib/Tools/flex.py b/waflib/Tools/flex.py
new file mode 100644
index 0000000..d5f4367
--- /dev/null
+++ b/waflib/Tools/flex.py
@@ -0,0 +1,27 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import waflib.TaskGen
+def decide_ext(self,node):
+	if'cxx'in self.features:
+		return['.lex.cc']
+	return['.lex.c']
+def flexfun(tsk):
+	env=tsk.env
+	bld=tsk.generator.bld
+	wd=bld.variant_dir
+	def to_list(xx):
+		if isinstance(xx,str):return[xx]
+		return xx
+	tsk.last_cmd=lst=[]
+	lst.extend(to_list(env['FLEX']))
+	lst.extend(to_list(env['FLEXFLAGS']))
+	lst.extend([a.path_from(bld.bldnode)for a in tsk.inputs])
+	lst=[x for x in lst if x]
+	txt=bld.cmd_and_log(lst,cwd=wd,env=env.env or None,quiet=0)
+	tsk.outputs[0].write(txt)
+waflib.TaskGen.declare_chain(name='flex',rule=flexfun,ext_in='.l',decider=decide_ext,)
+def configure(conf):
+	conf.find_program('flex',var='FLEX')
+	conf.env.FLEXFLAGS=['-t']
diff --git a/waflib/Tools/g95.py b/waflib/Tools/g95.py
new file mode 100644
index 0000000..a2bb542
--- /dev/null
+++ b/waflib/Tools/g95.py
@@ -0,0 +1,55 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import re
+from waflib import Utils
+from waflib.Tools import fc,fc_config,fc_scan
+from waflib.Configure import conf
+def find_g95(conf):
+	fc=conf.find_program('g95',var='FC')
+	fc=conf.cmd_to_list(fc)
+	conf.get_g95_version(fc)
+	conf.env.FC_NAME='G95'
+def g95_flags(conf):
+	v=conf.env
+	v['FCFLAGS_fcshlib']=['-fPIC']
+	v['FORTRANMODFLAG']=['-fmod=','']
+	v['FCFLAGS_DEBUG']=['-Werror']
+def g95_modifier_win32(conf):
+	fc_config.fortran_modifier_win32(conf)
+def g95_modifier_cygwin(conf):
+	fc_config.fortran_modifier_cygwin(conf)
+def g95_modifier_darwin(conf):
+	fc_config.fortran_modifier_darwin(conf)
+def g95_modifier_platform(conf):
+	dest_os=conf.env['DEST_OS']or Utils.unversioned_sys_platform()
+	g95_modifier_func=getattr(conf,'g95_modifier_'+dest_os,None)
+	if g95_modifier_func:
+		g95_modifier_func()
+def get_g95_version(conf,fc):
+	version_re=re.compile(r"g95\s*(?P<major>\d*)\.(?P<minor>\d*)").search
+	cmd=fc+['--version']
+	out,err=fc_config.getoutput(conf,cmd,stdin=False)
+	if out:
+		match=version_re(out)
+	else:
+		match=version_re(err)
+	if not match:
+		conf.fatal('cannot determine g95 version')
+	k=match.groupdict()
+	conf.env['FC_VERSION']=(k['major'],k['minor'])
+def configure(conf):
+	conf.find_g95()
+	conf.find_ar()
+	conf.fc_flags()
+	conf.g95_flags()
+	conf.g95_modifier_platform()
+
+conf(find_g95)
+conf(g95_flags)
+conf(g95_modifier_win32)
+conf(g95_modifier_cygwin)
+conf(g95_modifier_darwin)
+conf(g95_modifier_platform)
+conf(get_g95_version)
\ No newline at end of file
diff --git a/waflib/Tools/gas.py b/waflib/Tools/gas.py
new file mode 100644
index 0000000..0aef0c4
--- /dev/null
+++ b/waflib/Tools/gas.py
@@ -0,0 +1,11 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import waflib.Tools.asm
+from waflib.Tools import ar
+def configure(conf):
+	conf.find_program(['gas','as','gcc'],var='AS')
+	conf.env.AS_TGT_F=['-o']
+	conf.env.ASLNK_TGT_F=['-o']
+	conf.find_ar()
diff --git a/waflib/Tools/gcc.py b/waflib/Tools/gcc.py
new file mode 100644
index 0000000..5734b76
--- /dev/null
+++ b/waflib/Tools/gcc.py
@@ -0,0 +1,98 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os,sys
+from waflib import Configure,Options,Utils
+from waflib.Tools import ccroot,ar
+from waflib.Configure import conf
+def find_gcc(conf):
+	cc=conf.find_program(['gcc','cc'],var='CC')
+	cc=conf.cmd_to_list(cc)
+	conf.get_cc_version(cc,gcc=True)
+	conf.env.CC_NAME='gcc'
+	conf.env.CC=cc
+def gcc_common_flags(conf):
+	v=conf.env
+	v['CC_SRC_F']=[]
+	v['CC_TGT_F']=['-c','-o']
+	if not v['LINK_CC']:v['LINK_CC']=v['CC']
+	v['CCLNK_SRC_F']=[]
+	v['CCLNK_TGT_F']=['-o']
+	v['CPPPATH_ST']='-I%s'
+	v['DEFINES_ST']='-D%s'
+	v['LIB_ST']='-l%s'
+	v['LIBPATH_ST']='-L%s'
+	v['STLIB_ST']='-l%s'
+	v['STLIBPATH_ST']='-L%s'
+	v['RPATH_ST']='-Wl,-rpath,%s'
+	v['SONAME_ST']='-Wl,-h,%s'
+	v['SHLIB_MARKER']='-Wl,-Bdynamic'
+	v['STLIB_MARKER']='-Wl,-Bstatic'
+	v['cprogram_PATTERN']='%s'
+	v['CFLAGS_cshlib']=['-fPIC']
+	v['LINKFLAGS_cshlib']=['-shared']
+	v['cshlib_PATTERN']='lib%s.so'
+	v['LINKFLAGS_cstlib']=['-Wl,-Bstatic']
+	v['cstlib_PATTERN']='lib%s.a'
+	v['LINKFLAGS_MACBUNDLE']=['-bundle','-undefined','dynamic_lookup']
+	v['CFLAGS_MACBUNDLE']=['-fPIC']
+	v['macbundle_PATTERN']='%s.bundle'
+def gcc_modifier_win32(conf):
+	v=conf.env
+	v['cprogram_PATTERN']='%s.exe'
+	v['cshlib_PATTERN']='%s.dll'
+	v['implib_PATTERN']='lib%s.dll.a'
+	v['IMPLIB_ST']='-Wl,--out-implib,%s'
+	v['CFLAGS_cshlib']=[]
+	v.append_value('CFLAGS_cshlib',['-DDLL_EXPORT'])
+	v.append_value('LINKFLAGS',['-Wl,--enable-auto-import'])
+def gcc_modifier_cygwin(conf):
+	gcc_modifier_win32(conf)
+	v=conf.env
+	v['cshlib_PATTERN']='cyg%s.dll'
+	v.append_value('LINKFLAGS_cshlib',['-Wl,--enable-auto-image-base'])
+	v['CFLAGS_cshlib']=[]
+def gcc_modifier_darwin(conf):
+	v=conf.env
+	v['CFLAGS_cshlib']=['-fPIC','-compatibility_version','1','-current_version','1']
+	v['LINKFLAGS_cshlib']=['-dynamiclib']
+	v['cshlib_PATTERN']='lib%s.dylib'
+	v['FRAMEWORKPATH_ST']='-F%s'
+	v['FRAMEWORK_ST']=['-framework']
+	v['ARCH_ST']=['-arch']
+	v['LINKFLAGS_cstlib']=[]
+	v['SHLIB_MARKER']=[]
+	v['STLIB_MARKER']=[]
+	v['SONAME_ST']=[]
+def gcc_modifier_aix(conf):
+	v=conf.env
+	v['LINKFLAGS_cprogram']=['-Wl,-brtl']
+	v['LINKFLAGS_cshlib']=['-shared','-Wl,-brtl,-bexpfull']
+	v['SHLIB_MARKER']=[]
+def gcc_modifier_hpux(conf):
+	v=conf.env
+	v['SHLIB_MARKER']=[]
+	v['CFLAGS_cshlib']=['-fPIC','-DPIC']
+	v['cshlib_PATTERN']='lib%s.sl'
+def gcc_modifier_platform(conf):
+	gcc_modifier_func=getattr(conf,'gcc_modifier_'+conf.env.DEST_OS,None)
+	if gcc_modifier_func:
+		gcc_modifier_func()
+def configure(conf):
+	conf.find_gcc()
+	conf.find_ar()
+	conf.gcc_common_flags()
+	conf.gcc_modifier_platform()
+	conf.cc_load_tools()
+	conf.cc_add_flags()
+	conf.link_add_flags()
+
+conf(find_gcc)
+conf(gcc_common_flags)
+conf(gcc_modifier_win32)
+conf(gcc_modifier_cygwin)
+conf(gcc_modifier_darwin)
+conf(gcc_modifier_aix)
+conf(gcc_modifier_hpux)
+conf(gcc_modifier_platform)
\ No newline at end of file
diff --git a/waflib/Tools/gdc.py b/waflib/Tools/gdc.py
new file mode 100644
index 0000000..ff8a8ab
--- /dev/null
+++ b/waflib/Tools/gdc.py
@@ -0,0 +1,34 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import sys
+from waflib.Tools import ar,d
+from waflib.Configure import conf
+def find_gdc(conf):
+	conf.find_program('gdc',var='D')
+def common_flags_gdc(conf):
+	v=conf.env
+	v['DFLAGS']=[]
+	v['D_SRC_F']=['-c']
+	v['D_TGT_F']='-o%s'
+	v['D_LINKER']=v['D']
+	v['DLNK_SRC_F']=''
+	v['DLNK_TGT_F']='-o%s'
+	v['DINC_ST']='-I%s'
+	v['DSHLIB_MARKER']=v['DSTLIB_MARKER']=''
+	v['DSTLIB_ST']=v['DSHLIB_ST']='-l%s'
+	v['DSTLIBPATH_ST']=v['DLIBPATH_ST']='-L%s'
+	v['LINKFLAGS_dshlib']=['-shared']
+	v['DHEADER_ext']='.di'
+	v.DFLAGS_d_with_header='-fintfc'
+	v['D_HDR_F']='-fintfc-file=%s'
+def configure(conf):
+	conf.find_gdc()
+	conf.load('ar')
+	conf.load('d')
+	conf.common_flags_gdc()
+	conf.d_platform_flags()
+
+conf(find_gdc)
+conf(common_flags_gdc)
\ No newline at end of file
diff --git a/waflib/Tools/gfortran.py b/waflib/Tools/gfortran.py
new file mode 100644
index 0000000..6dc1da1
--- /dev/null
+++ b/waflib/Tools/gfortran.py
@@ -0,0 +1,69 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import re
+from waflib import Utils
+from waflib.Tools import fc,fc_config,fc_scan
+from waflib.Configure import conf
+def find_gfortran(conf):
+	fc=conf.find_program(['gfortran','g77'],var='FC')
+	fc=conf.cmd_to_list(fc)
+	conf.get_gfortran_version(fc)
+	conf.env.FC_NAME='GFORTRAN'
+def gfortran_flags(conf):
+	v=conf.env
+	v['FCFLAGS_fcshlib']=['-fPIC']
+	v['FORTRANMODFLAG']=['-J','']
+	v['FCFLAGS_DEBUG']=['-Werror']
+def gfortran_modifier_win32(conf):
+	fc_config.fortran_modifier_win32(conf)
+def gfortran_modifier_cygwin(conf):
+	fc_config.fortran_modifier_cygwin(conf)
+def gfortran_modifier_darwin(conf):
+	fc_config.fortran_modifier_darwin(conf)
+def gfortran_modifier_platform(conf):
+	dest_os=conf.env['DEST_OS']or Utils.unversioned_sys_platform()
+	gfortran_modifier_func=getattr(conf,'gfortran_modifier_'+dest_os,None)
+	if gfortran_modifier_func:
+		gfortran_modifier_func()
+def get_gfortran_version(conf,fc):
+	version_re=re.compile(r"GNU\s*Fortran",re.I).search
+	cmd=fc+['--version']
+	out,err=fc_config.getoutput(conf,cmd,stdin=False)
+	if out:match=version_re(out)
+	else:match=version_re(err)
+	if not match:
+		conf.fatal('Could not determine the compiler type')
+	cmd=fc+['-dM','-E','-']
+	out,err=fc_config.getoutput(conf,cmd,stdin=True)
+	if out.find('__GNUC__')<0:
+		conf.fatal('Could not determine the compiler type')
+	k={}
+	out=out.split('\n')
+	import shlex
+	for line in out:
+		lst=shlex.split(line)
+		if len(lst)>2:
+			key=lst[1]
+			val=lst[2]
+			k[key]=val
+	def isD(var):
+		return var in k
+	def isT(var):
+		return var in k and k[var]!='0'
+	conf.env['FC_VERSION']=(k['__GNUC__'],k['__GNUC_MINOR__'],k['__GNUC_PATCHLEVEL__'])
+def configure(conf):
+	conf.find_gfortran()
+	conf.find_ar()
+	conf.fc_flags()
+	conf.gfortran_flags()
+	conf.gfortran_modifier_platform()
+
+conf(find_gfortran)
+conf(gfortran_flags)
+conf(gfortran_modifier_win32)
+conf(gfortran_modifier_cygwin)
+conf(gfortran_modifier_darwin)
+conf(gfortran_modifier_platform)
+conf(get_gfortran_version)
\ No newline at end of file
diff --git a/waflib/Tools/glib2.py b/waflib/Tools/glib2.py
new file mode 100644
index 0000000..0d79e52
--- /dev/null
+++ b/waflib/Tools/glib2.py
@@ -0,0 +1,174 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os
+from waflib import Task,Utils,Options,Errors,Logs
+from waflib.TaskGen import taskgen_method,before_method,after_method,feature
+def add_marshal_file(self,filename,prefix):
+	if not hasattr(self,'marshal_list'):
+		self.marshal_list=[]
+	self.meths.append('process_marshal')
+	self.marshal_list.append((filename,prefix))
+def process_marshal(self):
+	for f,prefix in getattr(self,'marshal_list',[]):
+		node=self.path.find_resource(f)
+		if not node:
+			raise Errors.WafError('file not found %r'%f)
+		h_node=node.change_ext('.h')
+		c_node=node.change_ext('.c')
+		task=self.create_task('glib_genmarshal',node,[h_node,c_node])
+		task.env.GLIB_GENMARSHAL_PREFIX=prefix
+	self.source=self.to_nodes(getattr(self,'source',[]))
+	self.source.append(c_node)
+class glib_genmarshal(Task.Task):
+	def run(self):
+		bld=self.inputs[0].__class__.ctx
+		get=self.env.get_flat
+		cmd1="%s %s --prefix=%s --header > %s"%(get('GLIB_GENMARSHAL'),self.inputs[0].srcpath(),get('GLIB_GENMARSHAL_PREFIX'),self.outputs[0].abspath())
+		ret=bld.exec_command(cmd1)
+		if ret:return ret
+		c='''#include "%s"\n'''%self.outputs[0].name
+		self.outputs[1].write(c)
+		cmd2="%s %s --prefix=%s --body >> %s"%(get('GLIB_GENMARSHAL'),self.inputs[0].srcpath(),get('GLIB_GENMARSHAL_PREFIX'),self.outputs[1].abspath())
+		return bld.exec_command(cmd2)
+	vars=['GLIB_GENMARSHAL_PREFIX','GLIB_GENMARSHAL']
+	color='BLUE'
+	ext_out=['.h']
+def add_enums_from_template(self,source='',target='',template='',comments=''):
+	if not hasattr(self,'enums_list'):
+		self.enums_list=[]
+	self.meths.append('process_enums')
+	self.enums_list.append({'source':source,'target':target,'template':template,'file-head':'','file-prod':'','file-tail':'','enum-prod':'','value-head':'','value-prod':'','value-tail':'','comments':comments})
+def add_enums(self,source='',target='',file_head='',file_prod='',file_tail='',enum_prod='',value_head='',value_prod='',value_tail='',comments=''):
+	if not hasattr(self,'enums_list'):
+		self.enums_list=[]
+	self.meths.append('process_enums')
+	self.enums_list.append({'source':source,'template':'','target':target,'file-head':file_head,'file-prod':file_prod,'file-tail':file_tail,'enum-prod':enum_prod,'value-head':value_head,'value-prod':value_prod,'value-tail':value_tail,'comments':comments})
+def process_enums(self):
+	for enum in getattr(self,'enums_list',[]):
+		task=self.create_task('glib_mkenums')
+		env=task.env
+		inputs=[]
+		source_list=self.to_list(enum['source'])
+		if not source_list:
+			raise Errors.WafError('missing source '+str(enum))
+		source_list=[self.path.find_resource(k)for k in source_list]
+		inputs+=source_list
+		env['GLIB_MKENUMS_SOURCE']=[k.abspath()for k in source_list]
+		if not enum['target']:
+			raise Errors.WafError('missing target '+str(enum))
+		tgt_node=self.path.find_or_declare(enum['target'])
+		if tgt_node.name.endswith('.c'):
+			self.source.append(tgt_node)
+		env['GLIB_MKENUMS_TARGET']=tgt_node.abspath()
+		options=[]
+		if enum['template']:
+			template_node=self.path.find_resource(enum['template'])
+			options.append('--template %s'%(template_node.abspath()))
+			inputs.append(template_node)
+		params={'file-head':'--fhead','file-prod':'--fprod','file-tail':'--ftail','enum-prod':'--eprod','value-head':'--vhead','value-prod':'--vprod','value-tail':'--vtail','comments':'--comments'}
+		for param,option in params.items():
+			if enum[param]:
+				options.append('%s %r'%(option,enum[param]))
+		env['GLIB_MKENUMS_OPTIONS']=' '.join(options)
+		task.set_inputs(inputs)
+		task.set_outputs(tgt_node)
+class glib_mkenums(Task.Task):
+	run_str='${GLIB_MKENUMS} ${GLIB_MKENUMS_OPTIONS} ${GLIB_MKENUMS_SOURCE} > ${GLIB_MKENUMS_TARGET}'
+	color='PINK'
+	ext_out=['.h']
+def add_settings_schemas(self,filename_list):
+	if not hasattr(self,'settings_schema_files'):
+		self.settings_schema_files=[]
+	if not isinstance(filename_list,list):
+		filename_list=[filename_list]
+	self.settings_schema_files.extend(filename_list)
+def add_settings_enums(self,namespace,filename_list):
+	if hasattr(self,'settings_enum_namespace'):
+		raise Errors.WafError("Tried to add gsettings enums to '%s' more than once"%self.name)
+	self.settings_enum_namespace=namespace
+	if type(filename_list)!='list':
+		filename_list=[filename_list]
+	self.settings_enum_files=filename_list
+def r_change_ext(self,ext):
+	name=self.name
+	k=name.rfind('.')
+	if k>=0:
+		name=name[:k]+ext
+	else:
+		name=name+ext
+	return self.parent.find_or_declare([name])
+def process_settings(self):
+	enums_tgt_node=[]
+	install_files=[]
+	settings_schema_files=getattr(self,'settings_schema_files',[])
+	if settings_schema_files and not self.env['GLIB_COMPILE_SCHEMAS']:
+		raise Errors.WafError("Unable to process GSettings schemas - glib-compile-schemas was not found during configure")
+	if hasattr(self,'settings_enum_files'):
+		enums_task=self.create_task('glib_mkenums')
+		source_list=self.settings_enum_files
+		source_list=[self.path.find_resource(k)for k in source_list]
+		enums_task.set_inputs(source_list)
+		enums_task.env['GLIB_MKENUMS_SOURCE']=[k.abspath()for k in source_list]
+		target=self.settings_enum_namespace+'.enums.xml'
+		tgt_node=self.path.find_or_declare(target)
+		enums_task.set_outputs(tgt_node)
+		enums_task.env['GLIB_MKENUMS_TARGET']=tgt_node.abspath()
+		enums_tgt_node=[tgt_node]
+		install_files.append(tgt_node)
+		options='--comments "<!-- @comment@ -->" --fhead "<schemalist>" --vhead "  <@type@ id=\\"%s.@EnumName@\\">" --vprod "    <value nick=\\"@valuenick@\\" value=\\"@valuenum@\\"/>" --vtail "  </@type@>" --ftail "</schemalist>" '%(self.settings_enum_namespace)
+		enums_task.env['GLIB_MKENUMS_OPTIONS']=options
+	for schema in settings_schema_files:
+		schema_task=self.create_task('glib_validate_schema')
+		schema_node=self.path.find_resource(schema)
+		if not schema_node:
+			raise Errors.WafError("Cannot find the schema file '%s'"%schema)
+		install_files.append(schema_node)
+		source_list=enums_tgt_node+[schema_node]
+		schema_task.set_inputs(source_list)
+		schema_task.env['GLIB_COMPILE_SCHEMAS_OPTIONS']=[("--schema-file="+k.abspath())for k in source_list]
+		target_node=r_change_ext(schema_node,'.xml.valid')
+		schema_task.set_outputs(target_node)
+		schema_task.env['GLIB_VALIDATE_SCHEMA_OUTPUT']=target_node.abspath()
+	def compile_schemas_callback(bld):
+		if not bld.is_install:return
+		Logs.pprint('YELLOW','Updating GSettings schema cache')
+		command=Utils.subst_vars("${GLIB_COMPILE_SCHEMAS} ${GSETTINGSSCHEMADIR}",bld.env)
+		ret=self.bld.exec_command(command)
+	if self.bld.is_install:
+		if not self.env['GSETTINGSSCHEMADIR']:
+			raise Errors.WafError('GSETTINGSSCHEMADIR not defined (should have been set up automatically during configure)')
+		if install_files:
+			self.bld.install_files(self.env['GSETTINGSSCHEMADIR'],install_files)
+			if not hasattr(self.bld,'_compile_schemas_registered'):
+				self.bld.add_post_fun(compile_schemas_callback)
+				self.bld._compile_schemas_registered=True
+class glib_validate_schema(Task.Task):
+	run_str='rm -f ${GLIB_VALIDATE_SCHEMA_OUTPUT} && ${GLIB_COMPILE_SCHEMAS} --dry-run ${GLIB_COMPILE_SCHEMAS_OPTIONS} && touch ${GLIB_VALIDATE_SCHEMA_OUTPUT}'
+	color='PINK'
+def configure(conf):
+	conf.find_program('glib-genmarshal',var='GLIB_GENMARSHAL')
+	conf.find_perl_program('glib-mkenums',var='GLIB_MKENUMS')
+	conf.find_program('glib-compile-schemas',var='GLIB_COMPILE_SCHEMAS',mandatory=False)
+	def getstr(varname):
+		return getattr(Options.options,varname,getattr(conf.env,varname,''))
+	gsettingsschemadir=getstr('GSETTINGSSCHEMADIR')
+	if not gsettingsschemadir:
+		datadir=getstr('DATADIR')
+		if not datadir:
+			prefix=conf.env['PREFIX']
+			datadir=os.path.join(prefix,'share')
+		gsettingsschemadir=os.path.join(datadir,'glib-2.0','schemas')
+	conf.env['GSETTINGSSCHEMADIR']=gsettingsschemadir
+def options(opt):
+	opt.add_option('--gsettingsschemadir',help='GSettings schema location [Default: ${datadir}/glib-2.0/schemas]',default='',dest='GSETTINGSSCHEMADIR')
+
+taskgen_method(add_marshal_file)
+before_method('process_source')(process_marshal)
+taskgen_method(add_enums_from_template)
+taskgen_method(add_enums)
+before_method('process_source')(process_enums)
+taskgen_method(add_settings_schemas)
+taskgen_method(add_settings_enums)
+feature('glib2')(process_settings)
\ No newline at end of file
diff --git a/waflib/Tools/gnu_dirs.py b/waflib/Tools/gnu_dirs.py
new file mode 100644
index 0000000..e698170
--- /dev/null
+++ b/waflib/Tools/gnu_dirs.py
@@ -0,0 +1,65 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os
+from waflib import Utils,Options,Context
+_options=[x.split(', ')for x in'''
+bindir, user executables, ${EXEC_PREFIX}/bin
+sbindir, system admin executables, ${EXEC_PREFIX}/sbin
+libexecdir, program executables, ${EXEC_PREFIX}/libexec
+sysconfdir, read-only single-machine data, ${PREFIX}/etc
+sharedstatedir, modifiable architecture-independent data, ${PREFIX}/com
+localstatedir, modifiable single-machine data, ${PREFIX}/var
+libdir, object code libraries, ${EXEC_PREFIX}/lib
+includedir, C header files, ${PREFIX}/include
+oldincludedir, C header files for non-gcc, /usr/include
+datarootdir, read-only arch.-independent data root, ${PREFIX}/share
+datadir, read-only architecture-independent data, ${DATAROOTDIR}
+infodir, info documentation, ${DATAROOTDIR}/info
+localedir, locale-dependent data, ${DATAROOTDIR}/locale
+mandir, man documentation, ${DATAROOTDIR}/man
+docdir, documentation root, ${DATAROOTDIR}/doc/${PACKAGE}
+htmldir, html documentation, ${DOCDIR}
+dvidir, dvi documentation, ${DOCDIR}
+pdfdir, pdf documentation, ${DOCDIR}
+psdir, ps documentation, ${DOCDIR}
+'''.split('\n')if x]
+def configure(conf):
+	def get_param(varname,default):
+		return getattr(Options.options,varname,'')or default
+	env=conf.env
+	conf.env.LIBDIR=conf.env.BINDIR=[]
+	env['EXEC_PREFIX']=get_param('EXEC_PREFIX',env['PREFIX'])
+	env['PACKAGE']=getattr(Context.g_module,'APPNAME',None)or env['PACKAGE']
+	complete=False
+	iter=0
+	while not complete and iter<len(_options)+1:
+		iter+=1
+		complete=True
+		for name,help,default in _options:
+			name=name.upper()
+			if not env[name]:
+				try:
+					env[name]=Utils.subst_vars(get_param(name,default).replace('/',os.sep),env)
+				except TypeError:
+					complete=False
+	if not complete:
+		lst=[name for name,_,_ in _options if not env[name.upper()]]
+		raise conf.errors.WafError('Variable substitution failure %r'%lst)
+def options(opt):
+	inst_dir=opt.add_option_group('Installation directories','By default, "waf install" will put the files in\
+ "/usr/local/bin", "/usr/local/lib" etc. An installation prefix other\
+ than "/usr/local" can be given using "--prefix", for example "--prefix=$HOME"')
+	for k in('--prefix','--destdir'):
+		option=opt.parser.get_option(k)
+		if option:
+			opt.parser.remove_option(k)
+			inst_dir.add_option(option)
+	inst_dir.add_option('--exec-prefix',help='installation prefix [Default: ${PREFIX}]',default='',dest='EXEC_PREFIX')
+	dirs_options=opt.add_option_group('Pre-defined installation directories','')
+	for name,help,default in _options:
+		option_name='--'+name
+		str_default=default
+		str_help='%s [Default: %s]'%(help,str_default)
+		dirs_options.add_option(option_name,help=str_help,default='',dest=name.upper())
diff --git a/waflib/Tools/gxx.py b/waflib/Tools/gxx.py
new file mode 100644
index 0000000..647008d
--- /dev/null
+++ b/waflib/Tools/gxx.py
@@ -0,0 +1,98 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os,sys
+from waflib import Configure,Options,Utils
+from waflib.Tools import ccroot,ar
+from waflib.Configure import conf
+def find_gxx(conf):
+	cxx=conf.find_program(['g++','c++'],var='CXX')
+	cxx=conf.cmd_to_list(cxx)
+	conf.get_cc_version(cxx,gcc=True)
+	conf.env.CXX_NAME='gcc'
+	conf.env.CXX=cxx
+def gxx_common_flags(conf):
+	v=conf.env
+	v['CXX_SRC_F']=[]
+	v['CXX_TGT_F']=['-c','-o']
+	if not v['LINK_CXX']:v['LINK_CXX']=v['CXX']
+	v['CXXLNK_SRC_F']=[]
+	v['CXXLNK_TGT_F']=['-o']
+	v['CPPPATH_ST']='-I%s'
+	v['DEFINES_ST']='-D%s'
+	v['LIB_ST']='-l%s'
+	v['LIBPATH_ST']='-L%s'
+	v['STLIB_ST']='-l%s'
+	v['STLIBPATH_ST']='-L%s'
+	v['RPATH_ST']='-Wl,-rpath,%s'
+	v['SONAME_ST']='-Wl,-h,%s'
+	v['SHLIB_MARKER']='-Wl,-Bdynamic'
+	v['STLIB_MARKER']='-Wl,-Bstatic'
+	v['cxxprogram_PATTERN']='%s'
+	v['CXXFLAGS_cxxshlib']=['-fPIC']
+	v['LINKFLAGS_cxxshlib']=['-shared']
+	v['cxxshlib_PATTERN']='lib%s.so'
+	v['LINKFLAGS_cxxstlib']=['-Wl,-Bstatic']
+	v['cxxstlib_PATTERN']='lib%s.a'
+	v['LINKFLAGS_MACBUNDLE']=['-bundle','-undefined','dynamic_lookup']
+	v['CXXFLAGS_MACBUNDLE']=['-fPIC']
+	v['macbundle_PATTERN']='%s.bundle'
+def gxx_modifier_win32(conf):
+	v=conf.env
+	v['cxxprogram_PATTERN']='%s.exe'
+	v['cxxshlib_PATTERN']='%s.dll'
+	v['implib_PATTERN']='lib%s.dll.a'
+	v['IMPLIB_ST']='-Wl,--out-implib,%s'
+	v['CXXFLAGS_cxxshlib']=[]
+	v.append_value('CXXFLAGS_cxxshlib',['-DDLL_EXPORT'])
+	v.append_value('LINKFLAGS',['-Wl,--enable-auto-import'])
+def gxx_modifier_cygwin(conf):
+	gxx_modifier_win32(conf)
+	v=conf.env
+	v['cxxshlib_PATTERN']='cyg%s.dll'
+	v.append_value('LINKFLAGS_cxxshlib',['-Wl,--enable-auto-image-base'])
+	v['CXXFLAGS_cxxshlib']=[]
+def gxx_modifier_darwin(conf):
+	v=conf.env
+	v['CXXFLAGS_cxxshlib']=['-fPIC','-compatibility_version','1','-current_version','1']
+	v['LINKFLAGS_cxxshlib']=['-dynamiclib']
+	v['cxxshlib_PATTERN']='lib%s.dylib'
+	v['FRAMEWORKPATH_ST']='-F%s'
+	v['FRAMEWORK_ST']=['-framework']
+	v['ARCH_ST']=['-arch']
+	v['LINKFLAGS_cxxstlib']=[]
+	v['SHLIB_MARKER']=[]
+	v['STLIB_MARKER']=[]
+	v['SONAME_ST']=[]
+def gxx_modifier_aix(conf):
+	v=conf.env
+	v['LINKFLAGS_cxxprogram']=['-Wl,-brtl']
+	v['LINKFLAGS_cxxshlib']=['-shared','-Wl,-brtl,-bexpfull']
+	v['SHLIB_MARKER']=[]
+def gxx_modifier_hpux(conf):
+	v=conf.env
+	v['SHLIB_MARKER']=[]
+	v['CFLAGS_cxxshlib']=['-fPIC','-DPIC']
+	v['cxxshlib_PATTERN']='lib%s.sl'
+def gxx_modifier_platform(conf):
+	gxx_modifier_func=getattr(conf,'gxx_modifier_'+conf.env.DEST_OS,None)
+	if gxx_modifier_func:
+		gxx_modifier_func()
+def configure(conf):
+	conf.find_gxx()
+	conf.find_ar()
+	conf.gxx_common_flags()
+	conf.gxx_modifier_platform()
+	conf.cxx_load_tools()
+	conf.cxx_add_flags()
+	conf.link_add_flags()
+
+conf(find_gxx)
+conf(gxx_common_flags)
+conf(gxx_modifier_win32)
+conf(gxx_modifier_cygwin)
+conf(gxx_modifier_darwin)
+conf(gxx_modifier_aix)
+conf(gxx_modifier_hpux)
+conf(gxx_modifier_platform)
\ No newline at end of file
diff --git a/waflib/Tools/icc.py b/waflib/Tools/icc.py
new file mode 100644
index 0000000..eaac1cd
--- /dev/null
+++ b/waflib/Tools/icc.py
@@ -0,0 +1,31 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os,sys
+from waflib.Tools import ccroot,ar,gcc
+from waflib.Configure import conf
+def find_icc(conf):
+	if sys.platform=='cygwin':
+		conf.fatal('The Intel compiler does not work on Cygwin')
+	v=conf.env
+	cc=None
+	if v['CC']:cc=v['CC']
+	elif'CC'in conf.environ:cc=conf.environ['CC']
+	if not cc:cc=conf.find_program('icc',var='CC')
+	if not cc:cc=conf.find_program('ICL',var='CC')
+	if not cc:conf.fatal('Intel C Compiler (icc) was not found')
+	cc=conf.cmd_to_list(cc)
+	conf.get_cc_version(cc,icc=True)
+	v['CC']=cc
+	v['CC_NAME']='icc'
+def configure(conf):
+	conf.find_icc()
+	conf.find_ar()
+	conf.gcc_common_flags()
+	conf.gcc_modifier_platform()
+	conf.cc_load_tools()
+	conf.cc_add_flags()
+	conf.link_add_flags()
+
+conf(find_icc)
\ No newline at end of file
diff --git a/waflib/Tools/icpc.py b/waflib/Tools/icpc.py
new file mode 100644
index 0000000..6a222ff
--- /dev/null
+++ b/waflib/Tools/icpc.py
@@ -0,0 +1,30 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os,sys
+from waflib.Tools import ccroot,ar,gxx
+from waflib.Configure import conf
+def find_icpc(conf):
+	if sys.platform=='cygwin':
+		conf.fatal('The Intel compiler does not work on Cygwin')
+	v=conf.env
+	cxx=None
+	if v['CXX']:cxx=v['CXX']
+	elif'CXX'in conf.environ:cxx=conf.environ['CXX']
+	if not cxx:cxx=conf.find_program('icpc',var='CXX')
+	if not cxx:conf.fatal('Intel C++ Compiler (icpc) was not found')
+	cxx=conf.cmd_to_list(cxx)
+	conf.get_cc_version(cxx,icc=True)
+	v['CXX']=cxx
+	v['CXX_NAME']='icc'
+def configure(conf):
+	conf.find_icpc()
+	conf.find_ar()
+	conf.gxx_common_flags()
+	conf.gxx_modifier_platform()
+	conf.cxx_load_tools()
+	conf.cxx_add_flags()
+	conf.link_add_flags()
+
+conf(find_icpc)
\ No newline at end of file
diff --git a/waflib/Tools/ifort.py b/waflib/Tools/ifort.py
new file mode 100644
index 0000000..e9ad686
--- /dev/null
+++ b/waflib/Tools/ifort.py
@@ -0,0 +1,49 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import re
+from waflib import Utils
+from waflib.Tools import fc,fc_config,fc_scan
+from waflib.Configure import conf
+def find_ifort(conf):
+	fc=conf.find_program('ifort',var='FC')
+	fc=conf.cmd_to_list(fc)
+	conf.get_ifort_version(fc)
+	conf.env.FC_NAME='IFORT'
+def ifort_modifier_cygwin(conf):
+	raise NotImplementedError("Ifort on cygwin not yet implemented")
+def ifort_modifier_win32(conf):
+	fc_config.fortran_modifier_win32(conf)
+def ifort_modifier_darwin(conf):
+	fc_config.fortran_modifier_darwin(conf)
+def ifort_modifier_platform(conf):
+	dest_os=conf.env['DEST_OS']or Utils.unversioned_sys_platform()
+	ifort_modifier_func=getattr(conf,'ifort_modifier_'+dest_os,None)
+	if ifort_modifier_func:
+		ifort_modifier_func()
+def get_ifort_version(conf,fc):
+	version_re=re.compile(r"ifort\s*\(IFORT\)\s*(?P<major>\d*)\.(?P<minor>\d*)",re.I).search
+	cmd=fc+['--version']
+	out,err=fc_config.getoutput(conf,cmd,stdin=False)
+	if out:
+		match=version_re(out)
+	else:
+		match=version_re(err)
+	if not match:
+		conf.fatal('cannot determine ifort version.')
+	k=match.groupdict()
+	conf.env['FC_VERSION']=(k['major'],k['minor'])
+def configure(conf):
+	conf.find_ifort()
+	conf.find_program('xiar',var='AR')
+	conf.env.ARFLAGS='rcs'
+	conf.fc_flags()
+	conf.ifort_modifier_platform()
+
+conf(find_ifort)
+conf(ifort_modifier_cygwin)
+conf(ifort_modifier_win32)
+conf(ifort_modifier_darwin)
+conf(ifort_modifier_platform)
+conf(get_ifort_version)
\ No newline at end of file
diff --git a/waflib/Tools/intltool.py b/waflib/Tools/intltool.py
new file mode 100644
index 0000000..54cb3a2
--- /dev/null
+++ b/waflib/Tools/intltool.py
@@ -0,0 +1,78 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os,re
+from waflib import Configure,TaskGen,Task,Utils,Runner,Options,Build,Logs
+import waflib.Tools.ccroot
+from waflib.TaskGen import feature,before_method
+from waflib.Logs import error
+def apply_intltool_in_f(self):
+	try:self.meths.remove('process_source')
+	except ValueError:pass
+	if not self.env.LOCALEDIR:
+		self.env.LOCALEDIR=self.env.PREFIX+'/share/locale'
+	for i in self.to_list(self.source):
+		node=self.path.find_resource(i)
+		podir=getattr(self,'podir','po')
+		podirnode=self.path.find_dir(podir)
+		if not podirnode:
+			error("could not find the podir %r"%podir)
+			continue
+		cache=getattr(self,'intlcache','.intlcache')
+		self.env['INTLCACHE']=os.path.join(self.path.bldpath(),podir,cache)
+		self.env['INTLPODIR']=podirnode.bldpath()
+		self.env['INTLFLAGS']=getattr(self,'flags',['-q','-u','-c'])
+		task=self.create_task('intltool',node,node.change_ext(''))
+		inst=getattr(self,'install_path','${LOCALEDIR}')
+		if inst:
+			self.bld.install_files(inst,task.outputs)
+def apply_intltool_po(self):
+	try:self.meths.remove('process_source')
+	except ValueError:pass
+	if not self.env.LOCALEDIR:
+		self.env.LOCALEDIR=self.env.PREFIX+'/share/locale'
+	appname=getattr(self,'appname','set_your_app_name')
+	podir=getattr(self,'podir','')
+	inst=getattr(self,'install_path','${LOCALEDIR}')
+	linguas=self.path.find_node(os.path.join(podir,'LINGUAS'))
+	if linguas:
+		file=open(linguas.abspath())
+		langs=[]
+		for line in file.readlines():
+			if not line.startswith('#'):
+				langs+=line.split()
+		file.close()
+		re_linguas=re.compile('[-a-zA-Z_@.]+')
+		for lang in langs:
+			if re_linguas.match(lang):
+				node=self.path.find_resource(os.path.join(podir,re_linguas.match(lang).group()+'.po'))
+				task=self.create_task('po',node,node.change_ext('.mo'))
+				if inst:
+					filename=task.outputs[0].name
+					(langname,ext)=os.path.splitext(filename)
+					inst_file=inst+os.sep+langname+os.sep+'LC_MESSAGES'+os.sep+appname+'.mo'
+					self.bld.install_as(inst_file,task.outputs[0],chmod=getattr(self,'chmod',Utils.O644),env=task.env)
+	else:
+		Logs.pprint('RED',"Error no LINGUAS file found in po directory")
+class po(Task.Task):
+	run_str='${MSGFMT} -o ${TGT} ${SRC}'
+	color='BLUE'
+class intltool(Task.Task):
+	run_str='${INTLTOOL} ${INTLFLAGS} ${INTLCACHE} ${INTLPODIR} ${SRC} ${TGT}'
+	color='BLUE'
+def configure(conf):
+	conf.find_program('msgfmt',var='MSGFMT')
+	conf.find_perl_program('intltool-merge',var='INTLTOOL')
+	prefix=conf.env.PREFIX
+	datadir=conf.env.DATADIR
+	if not datadir:
+		datadir=os.path.join(prefix,'share')
+	conf.define('LOCALEDIR',os.path.join(datadir,'locale').replace('\\','\\\\'))
+	conf.define('DATADIR',datadir.replace('\\','\\\\'))
+	if conf.env.CC or conf.env.CXX:
+		conf.check(header_name='locale.h')
+
+before_method('process_source')(apply_intltool_in_f)
+feature('intltool_in')(apply_intltool_in_f)
+feature('intltool_po')(apply_intltool_po)
\ No newline at end of file
diff --git a/waflib/Tools/irixcc.py b/waflib/Tools/irixcc.py
new file mode 100644
index 0000000..bae88c9
--- /dev/null
+++ b/waflib/Tools/irixcc.py
@@ -0,0 +1,49 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os
+from waflib import Utils
+from waflib.Tools import ccroot,ar
+from waflib.Configure import conf
+def find_irixcc(conf):
+	v=conf.env
+	cc=None
+	if v['CC']:cc=v['CC']
+	elif'CC'in conf.environ:cc=conf.environ['CC']
+	if not cc:cc=conf.find_program('cc',var='CC')
+	if not cc:conf.fatal('irixcc was not found')
+	cc=conf.cmd_to_list(cc)
+	try:
+		conf.cmd_and_log(cc+['-version'])
+	except:
+		conf.fatal('%r -version could not be executed'%cc)
+	v['CC']=cc
+	v['CC_NAME']='irix'
+def irixcc_common_flags(conf):
+	v=conf.env
+	v['CC_SRC_F']=''
+	v['CC_TGT_F']=['-c','-o']
+	v['CPPPATH_ST']='-I%s'
+	v['DEFINES_ST']='-D%s'
+	if not v['LINK_CC']:v['LINK_CC']=v['CC']
+	v['CCLNK_SRC_F']=''
+	v['CCLNK_TGT_F']=['-o']
+	v['LIB_ST']='-l%s'
+	v['LIBPATH_ST']='-L%s'
+	v['STLIB_ST']='-l%s'
+	v['STLIBPATH_ST']='-L%s'
+	v['cprogram_PATTERN']='%s'
+	v['cshlib_PATTERN']='lib%s.so'
+	v['cstlib_PATTERN']='lib%s.a'
+def configure(conf):
+	conf.find_irixcc()
+	conf.find_cpp()
+	conf.find_ar()
+	conf.irixcc_common_flags()
+	conf.cc_load_tools()
+	conf.cc_add_flags()
+	conf.link_add_flags()
+
+conf(find_irixcc)
+conf(irixcc_common_flags)
\ No newline at end of file
diff --git a/waflib/Tools/javaw.py b/waflib/Tools/javaw.py
new file mode 100644
index 0000000..26ff560
--- /dev/null
+++ b/waflib/Tools/javaw.py
@@ -0,0 +1,275 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import sys
+if sys.hexversion < 0x020400f0: from sets import Set as set
+import os,re,tempfile,shutil
+from waflib.Configure import conf
+from waflib import TaskGen,Task,Utils,Options,Build,Errors,Node,Logs
+from waflib.TaskGen import feature,before_method,after_method
+from waflib.Tools import ccroot
+ccroot.USELIB_VARS['javac']=set(['CLASSPATH','JAVACFLAGS'])
+SOURCE_RE='**/*.java'
+JAR_RE='**/*'
+class_check_source='''
+public class Test {
+	public static void main(String[] argv) {
+		Class lib;
+		if (argv.length < 1) {
+			System.err.println("Missing argument");
+			System.exit(77);
+		}
+		try {
+			lib = Class.forName(argv[0]);
+		} catch (ClassNotFoundException e) {
+			System.err.println("ClassNotFoundException");
+			System.exit(1);
+		}
+		lib = null;
+		System.exit(0);
+	}
+}
+'''
+def apply_java(self):
+	Utils.def_attrs(self,jarname='',classpath='',sourcepath='.',srcdir='.',jar_mf_attributes={},jar_mf_classpath=[])
+	nodes_lst=[]
+	outdir=getattr(self,'outdir',None)
+	if outdir:
+		if not isinstance(outdir,Node.Node):
+			outdir=self.path.get_bld().make_node(self.outdir)
+	else:
+		outdir=self.path.get_bld()
+	outdir.mkdir()
+	self.outdir=outdir
+	self.env['OUTDIR']=outdir.abspath()
+	self.javac_task=tsk=self.create_task('javac')
+	tmp=[]
+	srcdir=getattr(self,'srcdir','')
+	if isinstance(srcdir,Node.Node):
+		srcdir=[srcdir]
+	for x in Utils.to_list(srcdir):
+		if isinstance(x,Node.Node):
+			y=x
+		else:
+			y=self.path.find_dir(x)
+			if not y:
+				self.bld.fatal('Could not find the folder %s from %s'%(x,self.path))
+		tmp.append(y)
+	tsk.srcdir=tmp
+	if getattr(self,'compat',None):
+		tsk.env.append_value('JAVACFLAGS',['-source',self.compat])
+	if hasattr(self,'sourcepath'):
+		fold=[isinstance(x,Node.Node)and x or self.path.find_dir(x)for x in self.to_list(self.sourcepath)]
+		names=os.pathsep.join([x.srcpath()for x in fold])
+	else:
+		names=[x.srcpath()for x in tsk.srcdir]
+	if names:
+		tsk.env.append_value('JAVACFLAGS',['-sourcepath',names])
+def use_javac_files(self):
+	lst=[]
+	self.uselib=self.to_list(getattr(self,'uselib',[]))
+	names=self.to_list(getattr(self,'use',[]))
+	get=self.bld.get_tgen_by_name
+	for x in names:
+		try:
+			y=get(x)
+		except:
+			self.uselib.append(x)
+		else:
+			y.post()
+			lst.append(y.jar_task.outputs[0].abspath())
+			self.javac_task.set_run_after(y.jar_task)
+	if lst:
+		self.env.append_value('CLASSPATH',lst)
+def set_classpath(self):
+	self.env.append_value('CLASSPATH',getattr(self,'classpath',[]))
+	for x in self.tasks:
+		x.env.CLASSPATH=os.pathsep.join(self.env.CLASSPATH)+os.pathsep
+def jar_files(self):
+	destfile=getattr(self,'destfile','test.jar')
+	jaropts=getattr(self,'jaropts',[])
+	manifest=getattr(self,'manifest',None)
+	basedir=getattr(self,'basedir',None)
+	if basedir:
+		if not isinstance(self.basedir,Node.Node):
+			basedir=self.path.get_bld().make_node(basedir)
+	else:
+		basedir=self.path.get_bld()
+	if not basedir:
+		self.bld.fatal('Could not find the basedir %r for %r'%(self.basedir,self))
+	self.jar_task=tsk=self.create_task('jar_create')
+	if manifest:
+		jarcreate=getattr(self,'jarcreate','cfm')
+		node=self.path.find_node(manifest)
+		tsk.dep_nodes.append(node)
+		jaropts.insert(0,node.abspath())
+	else:
+		jarcreate=getattr(self,'jarcreate','cf')
+	if not isinstance(destfile,Node.Node):
+		destfile=self.path.find_or_declare(destfile)
+	if not destfile:
+		self.bld.fatal('invalid destfile %r for %r'%(destfile,self))
+	tsk.set_outputs(destfile)
+	tsk.basedir=basedir
+	jaropts.append('-C')
+	jaropts.append(basedir.bldpath())
+	jaropts.append('.')
+	tsk.env['JAROPTS']=jaropts
+	tsk.env['JARCREATE']=jarcreate
+	if getattr(self,'javac_task',None):
+		tsk.set_run_after(self.javac_task)
+def use_jar_files(self):
+	lst=[]
+	self.uselib=self.to_list(getattr(self,'uselib',[]))
+	names=self.to_list(getattr(self,'use',[]))
+	get=self.bld.get_tgen_by_name
+	for x in names:
+		try:
+			y=get(x)
+		except:
+			self.uselib.append(x)
+		else:
+			y.post()
+			self.jar_task.run_after.update(y.tasks)
+class jar_create(Task.Task):
+	color='GREEN'
+	run_str='${JAR} ${JARCREATE} ${TGT} ${JAROPTS}'
+	def runnable_status(self):
+		for t in self.run_after:
+			if not t.hasrun:
+				return Task.ASK_LATER
+		if not self.inputs:
+			global JAR_RE
+			try:
+				self.inputs=[x for x in self.basedir.ant_glob(JAR_RE,remove=False)if id(x)!=id(self.outputs[0])]
+			except:
+				raise Errors.WafError('Could not find the basedir %r for %r'%(self.basedir,self))
+		return super(jar_create,self).runnable_status()
+class javac(Task.Task):
+	color='BLUE'
+	nocache=True
+	vars=['CLASSPATH','JAVACFLAGS','JAVAC','OUTDIR']
+	def runnable_status(self):
+		for t in self.run_after:
+			if not t.hasrun:
+				return Task.ASK_LATER
+		if not self.inputs:
+			global SOURCE_RE
+			self.inputs=[]
+			for x in self.srcdir:
+				self.inputs.extend(x.ant_glob(SOURCE_RE,remove=False))
+		return super(javac,self).runnable_status()
+	def run(self):
+		env=self.env
+		gen=self.generator
+		bld=gen.bld
+		wd=bld.bldnode.abspath()
+		def to_list(xx):
+			if isinstance(xx,str):return[xx]
+			return xx
+		cmd=[]
+		cmd.extend(to_list(env['JAVAC']))
+		cmd.extend(['-classpath'])
+		cmd.extend(to_list(env['CLASSPATH']))
+		cmd.extend(['-d'])
+		cmd.extend(to_list(env['OUTDIR']))
+		cmd.extend(to_list(env['JAVACFLAGS']))
+		files=[a.path_from(bld.bldnode)for a in self.inputs]
+		tmp=None
+		try:
+			if len(str(files))+len(str(cmd))>8192:
+				(fd,tmp)=tempfile.mkstemp(dir=bld.bldnode.abspath())
+				try:
+					os.write(fd,'\n'.join(files))
+				finally:
+					if tmp:
+						os.close(fd)
+				if Logs.verbose:
+					Logs.debug('runner: %r'%(cmd+files))
+				cmd.append('@'+tmp)
+			else:
+				cmd+=files
+			ret=self.exec_command(cmd,cwd=wd,env=env.env or None)
+		finally:
+			if tmp:
+				os.unlink(tmp)
+		return ret
+	def post_run(self):
+		for n in self.generator.outdir.ant_glob('**/*.class'):
+			n.sig=Utils.h_file(n.abspath())
+		self.generator.bld.task_sigs[self.uid()]=self.cache_sig
+def configure(self):
+	java_path=self.environ['PATH'].split(os.pathsep)
+	v=self.env
+	if'JAVA_HOME'in self.environ:
+		java_path=[os.path.join(self.environ['JAVA_HOME'],'bin')]+java_path
+		self.env['JAVA_HOME']=[self.environ['JAVA_HOME']]
+	for x in'javac java jar'.split():
+		self.find_program(x,var=x.upper(),path_list=java_path)
+		self.env[x.upper()]=self.cmd_to_list(self.env[x.upper()])
+	if'CLASSPATH'in self.environ:
+		v['CLASSPATH']=self.environ['CLASSPATH']
+	if not v['JAR']:self.fatal('jar is required for making java packages')
+	if not v['JAVAC']:self.fatal('javac is required for compiling java classes')
+	v['JARCREATE']='cf'
+	v['JAVACFLAGS']=[]
+def check_java_class(self,classname,with_classpath=None):
+	javatestdir='.waf-javatest'
+	classpath=javatestdir
+	if self.env['CLASSPATH']:
+		classpath+=os.pathsep+self.env['CLASSPATH']
+	if isinstance(with_classpath,str):
+		classpath+=os.pathsep+with_classpath
+	shutil.rmtree(javatestdir,True)
+	os.mkdir(javatestdir)
+	java_file=open(os.path.join(javatestdir,'Test.java'),'w')
+	java_file.write(class_check_source)
+	java_file.close()
+	self.exec_command(self.env['JAVAC']+[os.path.join(javatestdir,'Test.java')],shell=False)
+	cmd=self.env['JAVA']+['-cp',classpath,'Test',classname]
+	self.to_log("%s\n"%str(cmd))
+	found=self.exec_command(cmd,shell=False)
+	self.msg('Checking for java class %s'%classname,not found)
+	shutil.rmtree(javatestdir,True)
+	return found
+def check_jni_headers(conf):
+	if not conf.env.CC_NAME and not conf.env.CXX_NAME:
+		conf.fatal('load a compiler first (gcc, g++, ..)')
+	if not conf.env.JAVA_HOME:
+		conf.fatal('set JAVA_HOME in the system environment')
+	javaHome=conf.env['JAVA_HOME'][0]
+	dir=conf.root.find_dir(conf.env.JAVA_HOME[0]+'/include')
+	if dir is None:
+		conf.fatal('JAVA_HOME does not seem to be set properly')
+	f=dir.ant_glob('**/(jni|jni_md).h')
+	incDirs=[x.parent.abspath()for x in f]
+	dir=conf.root.find_dir(conf.env.JAVA_HOME[0])
+	f=dir.ant_glob('**/*jvm.(so|dll|dylib)')
+	libDirs=[x.parent.abspath()for x in f]or[javaHome]
+	f=dir.ant_glob('**/*jvm.(lib)')
+	if f:
+		libDirs=[[x,y.parent.abspath()]for x in libDirs for y in f]
+	for d in libDirs:
+		try:
+			conf.check(header_name='jni.h',define_name='HAVE_JNI_H',lib='jvm',libpath=d,includes=incDirs,uselib_store='JAVA',uselib='JAVA')
+		except:
+			pass
+		else:
+			break
+	else:
+		conf.fatal('could not find lib jvm in %r (see config.log)'%libDirs)
+
+feature('javac')(apply_java)
+before_method('process_source')(apply_java)
+feature('javac')(use_javac_files)
+after_method('apply_java')(use_javac_files)
+feature('javac')(set_classpath)
+after_method('apply_java','propagate_uselib_vars','use_javac_files')(set_classpath)
+feature('jar')(jar_files)
+after_method('apply_java','use_javac_files')(jar_files)
+before_method('process_source')(jar_files)
+feature('jar')(use_jar_files)
+after_method('jar_files')(use_jar_files)
+conf(check_java_class)
+conf(check_jni_headers)
\ No newline at end of file
diff --git a/waflib/Tools/kde4.py b/waflib/Tools/kde4.py
new file mode 100644
index 0000000..e4a8a92
--- /dev/null
+++ b/waflib/Tools/kde4.py
@@ -0,0 +1,49 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os,sys,re
+from waflib import Options,TaskGen,Task,Utils
+from waflib.TaskGen import feature,after_method
+def apply_msgfmt(self):
+	for lang in self.to_list(self.langs):
+		node=self.path.find_resource(lang+'.po')
+		task=self.create_task('msgfmt',node,node.change_ext('.mo'))
+		langname=lang.split('/')
+		langname=langname[-1]
+		inst=getattr(self,'install_path','${KDE4_LOCALE_INSTALL_DIR}')
+		self.bld.install_as(inst+os.sep+langname+os.sep+'LC_MESSAGES'+os.sep+getattr(self,'appname','set_your_appname')+'.mo',task.outputs[0],chmod=getattr(self,'chmod',Utils.O644))
+class msgfmt(Task.Task):
+	color='BLUE'
+	run_str='${MSGFMT} ${SRC} -o ${TGT}'
+def configure(self):
+	kdeconfig=self.find_program('kde4-config')
+	prefix=self.cmd_and_log('%s --prefix'%kdeconfig).strip()
+	fname='%s/share/apps/cmake/modules/KDELibsDependencies.cmake'%prefix
+	try:os.stat(fname)
+	except OSError:
+		fname='%s/share/kde4/apps/cmake/modules/KDELibsDependencies.cmake'%prefix
+		try:os.stat(fname)
+		except OSError:self.fatal('could not open %s'%fname)
+	try:
+		txt=Utils.readf(fname)
+	except(OSError,IOError):
+		self.fatal('could not read %s'%fname)
+	txt=txt.replace('\\\n','\n')
+	fu=re.compile('#(.*)\n')
+	txt=fu.sub('',txt)
+	setregexp=re.compile('([sS][eE][tT]\s*\()\s*([^\s]+)\s+\"([^"]+)\"\)')
+	found=setregexp.findall(txt)
+	for(_,key,val)in found:
+		self.env[key]=val
+	self.env['LIB_KDECORE']=['kdecore']
+	self.env['LIB_KDEUI']=['kdeui']
+	self.env['LIB_KIO']=['kio']
+	self.env['LIB_KHTML']=['khtml']
+	self.env['LIB_KPARTS']=['kparts']
+	self.env['LIBPATH_KDECORE']=[self.env['KDE4_LIB_INSTALL_DIR']]
+	self.env['INCLUDES_KDECORE']=[self.env['KDE4_INCLUDE_INSTALL_DIR']]
+	self.env.append_value('INCLUDES_KDECORE',[self.env['KDE4_INCLUDE_INSTALL_DIR']+os.sep+'KDE'])
+	self.find_program('msgfmt',var='MSGFMT')
+
+feature('msgfmt')(apply_msgfmt)
\ No newline at end of file
diff --git a/waflib/Tools/lua.py b/waflib/Tools/lua.py
new file mode 100644
index 0000000..0d48d4f
--- /dev/null
+++ b/waflib/Tools/lua.py
@@ -0,0 +1,19 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+from waflib.TaskGen import extension
+from waflib import Task,Utils
+def add_lua(self,node):
+	tsk=self.create_task('luac',node,node.change_ext('.luac'))
+	inst_to=getattr(self,'install_path',self.env.LUADIR and'${LUADIR}'or None)
+	if inst_to:
+		self.bld.install_files(inst_to,tsk.outputs)
+	return tsk
+class luac(Task.Task):
+	run_str='${LUAC} -s -o ${TGT} ${SRC}'
+	color='PINK'
+def configure(conf):
+	conf.find_program('luac',var='LUAC')
+
+extension('.lua')(add_lua)
\ No newline at end of file
diff --git a/waflib/Tools/msvc.py b/waflib/Tools/msvc.py
new file mode 100644
index 0000000..1ec9bb6
--- /dev/null
+++ b/waflib/Tools/msvc.py
@@ -0,0 +1,654 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os,sys,re,tempfile
+try:
+	import _winreg
+except:
+	try:
+		import winreg as _winreg
+	except:
+		_winreg=None
+from waflib import Utils,TaskGen,Runner,Configure,Task,Options
+from waflib.Logs import debug,info,warn,error
+from waflib.TaskGen import after_method,before_method,feature
+from waflib.Configure import conf
+from waflib.Tools import ccroot,c,cxx,ar,winres
+g_msvc_systemlibs='''
+aclui activeds ad1 adptif adsiid advapi32 asycfilt authz bhsupp bits bufferoverflowu cabinet
+cap certadm certidl ciuuid clusapi comctl32 comdlg32 comsupp comsuppd comsuppw comsuppwd comsvcs
+credui crypt32 cryptnet cryptui d3d8thk daouuid dbgeng dbghelp dciman32 ddao35 ddao35d
+ddao35u ddao35ud delayimp dhcpcsvc dhcpsapi dlcapi dnsapi dsprop dsuiext dtchelp
+faultrep fcachdll fci fdi framedyd framedyn gdi32 gdiplus glauxglu32 gpedit gpmuuid
+gtrts32w gtrtst32hlink htmlhelp httpapi icm32 icmui imagehlp imm32 iphlpapi iprop
+kernel32 ksguid ksproxy ksuser libcmt libcmtd libcpmt libcpmtd loadperf lz32 mapi
+mapi32 mgmtapi minidump mmc mobsync mpr mprapi mqoa mqrt msacm32 mscms mscoree
+msdasc msimg32 msrating mstask msvcmrt msvcurt msvcurtd mswsock msxml2 mtx mtxdm
+netapi32 nmapinmsupp npptools ntdsapi ntdsbcli ntmsapi ntquery odbc32 odbcbcp
+odbccp32 oldnames ole32 oleacc oleaut32 oledb oledlgolepro32 opends60 opengl32
+osptk parser pdh penter pgobootrun pgort powrprof psapi ptrustm ptrustmd ptrustu
+ptrustud qosname rasapi32 rasdlg rassapi resutils riched20 rpcndr rpcns4 rpcrt4 rtm
+rtutils runtmchk scarddlg scrnsave scrnsavw secur32 sensapi setupapi sfc shell32
+shfolder shlwapi sisbkup snmpapi sporder srclient sti strsafe svcguid tapi32 thunk32
+traffic unicows url urlmon user32 userenv usp10 uuid uxtheme vcomp vcompd vdmdbg
+version vfw32 wbemuuid  webpost wiaguid wininet winmm winscard winspool winstrm
+wintrust wldap32 wmiutils wow32 ws2_32 wsnmp32 wsock32 wst wtsapi32 xaswitch xolehlp
+'''.split()
+all_msvc_platforms=[('x64','amd64'),('x86','x86'),('ia64','ia64'),('x86_amd64','amd64'),('x86_ia64','ia64')]
+all_wince_platforms=[('armv4','arm'),('armv4i','arm'),('mipsii','mips'),('mipsii_fp','mips'),('mipsiv','mips'),('mipsiv_fp','mips'),('sh4','sh'),('x86','cex86')]
+all_icl_platforms=[('intel64','amd64'),('em64t','amd64'),('ia32','x86'),('Itanium','ia64')]
+def options(opt):
+	opt.add_option('--msvc_version',type='string',help='msvc version, eg: "msvc 10.0,msvc 9.0"',default='')
+	opt.add_option('--msvc_targets',type='string',help='msvc targets, eg: "x64,arm"',default='')
+def setup_msvc(conf,versions):
+	platforms=getattr(Options.options,'msvc_targets','').split(',')
+	if platforms==['']:
+		platforms=Utils.to_list(conf.env['MSVC_TARGETS'])or[i for i,j in all_msvc_platforms+all_icl_platforms+all_wince_platforms]
+	desired_versions=getattr(Options.options,'msvc_version','').split(',')
+	if desired_versions==['']:
+		desired_versions=conf.env['MSVC_VERSIONS']or[v for v,_ in versions][::-1]
+	versiondict=dict(versions)
+	for version in desired_versions:
+		try:
+			targets=dict(versiondict[version])
+			for target in platforms:
+				try:
+					arch,(p1,p2,p3)=targets[target]
+					compiler,revision=version.rsplit(' ',1)
+					return compiler,revision,p1,p2,p3
+				except KeyError:continue
+		except KeyError:continue
+	conf.fatal('msvc: Impossible to find a valid architecture for building (in setup_msvc)')
+def get_msvc_version(conf,compiler,version,target,vcvars):
+	debug('msvc: get_msvc_version: %r %r %r',compiler,version,target)
+	batfile=conf.bldnode.make_node('waf-print-msvc.bat')
+	batfile.write("""@echo off
+set INCLUDE=
+set LIB=
+call "%s" %s
+echo PATH=%%PATH%%
+echo INCLUDE=%%INCLUDE%%
+echo LIB=%%LIB%%
+"""%(vcvars,target))
+	sout=conf.cmd_and_log(['cmd','/E:on','/V:on','/C',batfile.abspath()])
+	lines=sout.splitlines()
+	if not lines[0]:lines=lines[1:]
+	for x in('Setting environment','Setting SDK environment','Intel(R) C++ Compiler','Intel Parallel Studio'):
+		if lines[0].find(x)!=-1:
+			break
+	else:
+		debug('msvc: get_msvc_version: %r %r %r -> not found',compiler,version,target)
+		conf.fatal('msvc: Impossible to find a valid architecture for building (in get_msvc_version)')
+	for line in lines[1:]:
+		if line.startswith('PATH='):
+			path=line[5:]
+			MSVC_PATH=path.split(';')
+		elif line.startswith('INCLUDE='):
+			MSVC_INCDIR=[i for i in line[8:].split(';')if i]
+		elif line.startswith('LIB='):
+			MSVC_LIBDIR=[i for i in line[4:].split(';')if i]
+	env={}
+	env.update(os.environ)
+	env.update(PATH=path)
+	compiler_name,linker_name,lib_name=_get_prog_names(conf,compiler)
+	cxx=conf.find_program(compiler_name,path_list=MSVC_PATH)
+	cxx=conf.cmd_to_list(cxx)
+	if'CL'in env:
+		del(env['CL'])
+	try:
+		try:
+			conf.cmd_and_log(cxx+['/help'],env=env)
+		except Exception ,e:
+			debug('msvc: get_msvc_version: %r %r %r -> failure'%(compiler,version,target))
+			debug(str(e))
+			conf.fatal('msvc: cannot run the compiler (in get_msvc_version)')
+		else:
+			debug('msvc: get_msvc_version: %r %r %r -> OK',compiler,version,target)
+	finally:
+		conf.env[compiler_name]=''
+	return(MSVC_PATH,MSVC_INCDIR,MSVC_LIBDIR)
+def gather_wsdk_versions(conf,versions):
+	version_pattern=re.compile('^v..?.?\...?.?')
+	try:
+		all_versions=_winreg.OpenKey(_winreg.HKEY_LOCAL_MACHINE,'SOFTWARE\\Wow6432node\\Microsoft\\Microsoft SDKs\\Windows')
+	except WindowsError:
+		try:
+			all_versions=_winreg.OpenKey(_winreg.HKEY_LOCAL_MACHINE,'SOFTWARE\\Microsoft\\Microsoft SDKs\\Windows')
+		except WindowsError:
+			return
+	index=0
+	while 1:
+		try:
+			version=_winreg.EnumKey(all_versions,index)
+		except WindowsError:
+			break
+		index=index+1
+		if not version_pattern.match(version):
+			continue
+		try:
+			msvc_version=_winreg.OpenKey(all_versions,version)
+			path,type=_winreg.QueryValueEx(msvc_version,'InstallationFolder')
+		except WindowsError:
+			continue
+		if os.path.isfile(os.path.join(path,'bin','SetEnv.cmd')):
+			targets=[]
+			for target,arch in all_msvc_platforms:
+				try:
+					targets.append((target,(arch,conf.get_msvc_version('wsdk',version,'/'+target,os.path.join(path,'bin','SetEnv.cmd')))))
+				except conf.errors.ConfigurationError:
+					pass
+			versions.append(('wsdk '+version[1:],targets))
+def gather_wince_supported_platforms():
+	supported_wince_platforms=[]
+	try:
+		ce_sdk=_winreg.OpenKey(_winreg.HKEY_LOCAL_MACHINE,'SOFTWARE\\Wow6432node\\Microsoft\\Windows CE Tools\\SDKs')
+	except WindowsError:
+		try:
+			ce_sdk=_winreg.OpenKey(_winreg.HKEY_LOCAL_MACHINE,'SOFTWARE\\Microsoft\\Windows CE Tools\\SDKs')
+		except WindowsError:
+			ce_sdk=''
+	if not ce_sdk:
+		return supported_wince_platforms
+	ce_index=0
+	while 1:
+		try:
+			sdk_device=_winreg.EnumKey(ce_sdk,ce_index)
+		except WindowsError:
+			break
+		ce_index=ce_index+1
+		sdk=_winreg.OpenKey(ce_sdk,sdk_device)
+		try:
+			path,type=_winreg.QueryValueEx(sdk,'SDKRootDir')
+		except WindowsError:
+			try:
+				path,type=_winreg.QueryValueEx(sdk,'SDKInformation')
+				path,xml=os.path.split(path)
+			except WindowsError:
+				continue
+		path=str(path)
+		path,device=os.path.split(path)
+		if not device:
+			path,device=os.path.split(path)
+		for arch,compiler in all_wince_platforms:
+			platforms=[]
+			if os.path.isdir(os.path.join(path,device,'Lib',arch)):
+				platforms.append((arch,compiler,os.path.join(path,device,'Include',arch),os.path.join(path,device,'Lib',arch)))
+			if platforms:
+				supported_wince_platforms.append((device,platforms))
+	return supported_wince_platforms
+def gather_msvc_detected_versions():
+	version_pattern=re.compile('^(\d\d?\.\d\d?)(Exp)?$')
+	detected_versions=[]
+	for vcver,vcvar in[('VCExpress','Exp'),('VisualStudio','')]:
+		try:
+			prefix='SOFTWARE\\Wow6432node\\Microsoft\\'+vcver
+			all_versions=_winreg.OpenKey(_winreg.HKEY_LOCAL_MACHINE,prefix)
+		except WindowsError:
+			try:
+				prefix='SOFTWARE\\Microsoft\\'+vcver
+				all_versions=_winreg.OpenKey(_winreg.HKEY_LOCAL_MACHINE,prefix)
+			except WindowsError:
+				continue
+		index=0
+		while 1:
+			try:
+				version=_winreg.EnumKey(all_versions,index)
+			except WindowsError:
+				break
+			index=index+1
+			match=version_pattern.match(version)
+			if not match:
+				continue
+			else:
+				versionnumber=float(match.group(1))
+			detected_versions.append((versionnumber,version+vcvar,prefix+"\\"+version))
+	def fun(tup):
+		return tup[0]
+	try:
+		detected_versions.sort(key=fun)
+	except:
+		detected_versions.sort(lambda x,y:cmp(x[0],y[0]))
+	return detected_versions
+def gather_msvc_targets(conf,versions,version,vc_path):
+	targets=[]
+	if os.path.isfile(os.path.join(vc_path,'vcvarsall.bat')):
+		for target,realtarget in all_msvc_platforms[::-1]:
+			try:
+				targets.append((target,(realtarget,conf.get_msvc_version('msvc',version,target,os.path.join(vc_path,'vcvarsall.bat')))))
+			except conf.errors.ConfigurationError:
+				pass
+	elif os.path.isfile(os.path.join(vc_path,'Common7','Tools','vsvars32.bat')):
+		try:
+			targets.append(('x86',('x86',conf.get_msvc_version('msvc',version,'x86',os.path.join(vc_path,'Common7','Tools','vsvars32.bat')))))
+		except conf.errors.ConfigurationError:
+			pass
+	elif os.path.isfile(os.path.join(vc_path,'Bin','vcvars32.bat')):
+		try:
+			targets.append(('x86',('x86',conf.get_msvc_version('msvc',version,'',os.path.join(vc_path,'Bin','vcvars32.bat')))))
+		except conf.errors.ConfigurationError:
+			pass
+	versions.append(('msvc '+version,targets))
+def gather_wince_targets(conf,versions,version,vc_path,vsvars,supported_platforms):
+	for device,platforms in supported_platforms:
+		cetargets=[]
+		for platform,compiler,include,lib in platforms:
+			winCEpath=os.path.join(vc_path,'ce')
+			if not os.path.isdir(winCEpath):
+				continue
+			try:
+				common_bindirs,_1,_2=conf.get_msvc_version('msvc',version,'x86',vsvars)
+			except conf.errors.ConfigurationError:
+				continue
+			if os.path.isdir(os.path.join(winCEpath,'lib',platform)):
+				bindirs=[os.path.join(winCEpath,'bin',compiler),os.path.join(winCEpath,'bin','x86_'+compiler)]+common_bindirs
+				incdirs=[os.path.join(winCEpath,'include'),os.path.join(winCEpath,'atlmfc','include'),include]
+				libdirs=[os.path.join(winCEpath,'lib',platform),os.path.join(winCEpath,'atlmfc','lib',platform),lib]
+				cetargets.append((platform,(platform,(bindirs,incdirs,libdirs))))
+		if cetargets:
+			versions.append((device+' '+version,cetargets))
+def gather_msvc_versions(conf,versions):
+	vc_paths=[]
+	for(v,version,reg)in gather_msvc_detected_versions():
+		try:
+			try:
+				msvc_version=_winreg.OpenKey(_winreg.HKEY_LOCAL_MACHINE,reg+"\\Setup\\VC")
+			except WindowsError:
+				msvc_version=_winreg.OpenKey(_winreg.HKEY_LOCAL_MACHINE,reg+"\\Setup\\Microsoft Visual C++")
+			path,type=_winreg.QueryValueEx(msvc_version,'ProductDir')
+			vc_paths.append((version,os.path.abspath(str(path))))
+		except WindowsError:
+			continue
+	wince_supported_platforms=gather_wince_supported_platforms()
+	for version,vc_path in vc_paths:
+		vs_path=os.path.dirname(vc_path)
+		vsvars=os.path.join(vs_path,'Common7','Tools','vsvars32.bat')
+		if wince_supported_platforms and os.path.isfile(vsvars):
+			conf.gather_wince_targets(versions,version,vc_path,vsvars,wince_supported_platforms)
+	for version,vc_path in vc_paths:
+		vs_path=os.path.dirname(vc_path)
+		conf.gather_msvc_targets(versions,version,vc_path)
+def gather_icl_versions(conf,versions):
+	version_pattern=re.compile('^...?.?\....?.?')
+	try:
+		all_versions=_winreg.OpenKey(_winreg.HKEY_LOCAL_MACHINE,'SOFTWARE\\Wow6432node\\Intel\\Compilers\\C++')
+	except WindowsError:
+		try:
+			all_versions=_winreg.OpenKey(_winreg.HKEY_LOCAL_MACHINE,'SOFTWARE\\Intel\\Compilers\\C++')
+		except WindowsError:
+			return
+	index=0
+	while 1:
+		try:
+			version=_winreg.EnumKey(all_versions,index)
+		except WindowsError:
+			break
+		index=index+1
+		if not version_pattern.match(version):
+			continue
+		targets=[]
+		for target,arch in all_icl_platforms:
+			try:
+				if target=='intel64':targetDir='EM64T_NATIVE'
+				else:targetDir=target
+				_winreg.OpenKey(all_versions,version+'\\'+targetDir)
+				icl_version=_winreg.OpenKey(all_versions,version)
+				path,type=_winreg.QueryValueEx(icl_version,'ProductDir')
+				if os.path.isfile(os.path.join(path,'bin','iclvars.bat')):
+					try:
+						targets.append((target,(arch,conf.get_msvc_version('intel',version,target,os.path.join(path,'bin','iclvars.bat')))))
+					except conf.errors.ConfigurationError:
+						pass
+			except WindowsError:
+				pass
+		for target,arch in all_icl_platforms:
+			try:
+				icl_version=_winreg.OpenKey(all_versions,version+'\\'+target)
+				path,type=_winreg.QueryValueEx(icl_version,'ProductDir')
+				if os.path.isfile(os.path.join(path,'bin','iclvars.bat')):
+					try:
+						targets.append((target,(arch,conf.get_msvc_version('intel',version,target,os.path.join(path,'bin','iclvars.bat')))))
+					except conf.errors.ConfigurationError:
+						pass
+			except WindowsError:
+				continue
+		major=version[0:2]
+		versions.append(('intel '+major,targets))
+def get_msvc_versions(conf):
+	if not conf.env['MSVC_INSTALLED_VERSIONS']:
+		lst=[]
+		conf.gather_icl_versions(lst)
+		conf.gather_wsdk_versions(lst)
+		conf.gather_msvc_versions(lst)
+		conf.env['MSVC_INSTALLED_VERSIONS']=lst
+	return conf.env['MSVC_INSTALLED_VERSIONS']
+def print_all_msvc_detected(conf):
+	for version,targets in conf.env['MSVC_INSTALLED_VERSIONS']:
+		info(version)
+		for target,l in targets:
+			info("\t"+target)
+def detect_msvc(conf):
+	versions=get_msvc_versions(conf)
+	return setup_msvc(conf,versions)
+def find_lt_names_msvc(self,libname,is_static=False):
+	lt_names=['lib%s.la'%libname,'%s.la'%libname,]
+	for path in self.env['LIBPATH']:
+		for la in lt_names:
+			laf=os.path.join(path,la)
+			dll=None
+			if os.path.exists(laf):
+				ltdict=Utils.read_la_file(laf)
+				lt_libdir=None
+				if ltdict.get('libdir',''):
+					lt_libdir=ltdict['libdir']
+				if not is_static and ltdict.get('library_names',''):
+					dllnames=ltdict['library_names'].split()
+					dll=dllnames[0].lower()
+					dll=re.sub('\.dll$','',dll)
+					return(lt_libdir,dll,False)
+				elif ltdict.get('old_library',''):
+					olib=ltdict['old_library']
+					if os.path.exists(os.path.join(path,olib)):
+						return(path,olib,True)
+					elif lt_libdir!=''and os.path.exists(os.path.join(lt_libdir,olib)):
+						return(lt_libdir,olib,True)
+					else:
+						return(None,olib,True)
+				else:
+					raise self.errors.WafError('invalid libtool object file: %s'%laf)
+	return(None,None,None)
+def libname_msvc(self,libname,is_static=False):
+	lib=libname.lower()
+	lib=re.sub('\.lib$','',lib)
+	if lib in g_msvc_systemlibs:
+		return lib
+	lib=re.sub('^lib','',lib)
+	if lib=='m':
+		return None
+	(lt_path,lt_libname,lt_static)=self.find_lt_names_msvc(lib,is_static)
+	if lt_path!=None and lt_libname!=None:
+		if lt_static==True:
+			return os.path.join(lt_path,lt_libname)
+	if lt_path!=None:
+		_libpaths=[lt_path]+self.env['LIBPATH']
+	else:
+		_libpaths=self.env['LIBPATH']
+	static_libs=['lib%ss.lib'%lib,'lib%s.lib'%lib,'%ss.lib'%lib,'%s.lib'%lib,]
+	dynamic_libs=['lib%s.dll.lib'%lib,'lib%s.dll.a'%lib,'%s.dll.lib'%lib,'%s.dll.a'%lib,'lib%s_d.lib'%lib,'%s_d.lib'%lib,'%s.lib'%lib,]
+	libnames=static_libs
+	if not is_static:
+		libnames=dynamic_libs+static_libs
+	for path in _libpaths:
+		for libn in libnames:
+			if os.path.exists(os.path.join(path,libn)):
+				debug('msvc: lib found: %s'%os.path.join(path,libn))
+				return re.sub('\.lib$','',libn)
+	self.fatal("The library %r could not be found"%libname)
+	return re.sub('\.lib$','',libname)
+def check_lib_msvc(self,libname,is_static=False,uselib_store=None):
+	libn=self.libname_msvc(libname,is_static)
+	if not uselib_store:
+		uselib_store=libname.upper()
+	if False and is_static:
+		self.env['STLIB_'+uselib_store]=[libn]
+	else:
+		self.env['LIB_'+uselib_store]=[libn]
+def check_libs_msvc(self,libnames,is_static=False):
+	for libname in Utils.to_list(libnames):
+		self.check_lib_msvc(libname,is_static)
+def configure(conf):
+	conf.autodetect()
+	conf.find_msvc()
+	conf.msvc_common_flags()
+	conf.cc_load_tools()
+	conf.cxx_load_tools()
+	conf.cc_add_flags()
+	conf.cxx_add_flags()
+	conf.link_add_flags()
+	conf.visual_studio_add_flags()
+def no_autodetect(conf):
+	conf.env.NO_MSVC_DETECT=1
+	configure(conf)
+def autodetect(conf):
+	v=conf.env
+	if v.NO_MSVC_DETECT:
+		return
+	compiler,version,path,includes,libdirs=conf.detect_msvc()
+	v['PATH']=path
+	v['INCLUDES']=includes
+	v['LIBPATH']=libdirs
+	v['MSVC_COMPILER']=compiler
+	try:
+		v['MSVC_VERSION']=float(version)
+	except:
+		v['MSVC_VERSION']=float(version[:-3])
+def _get_prog_names(conf,compiler):
+	if compiler=='intel':
+		compiler_name='ICL'
+		linker_name='XILINK'
+		lib_name='XILIB'
+	else:
+		compiler_name='CL'
+		linker_name='LINK'
+		lib_name='LIB'
+	return compiler_name,linker_name,lib_name
+def find_msvc(conf):
+	if sys.platform=='cygwin':
+		conf.fatal('MSVC module does not work under cygwin Python!')
+	v=conf.env
+	path=v['PATH']
+	compiler=v['MSVC_COMPILER']
+	version=v['MSVC_VERSION']
+	compiler_name,linker_name,lib_name=_get_prog_names(conf,compiler)
+	v.MSVC_MANIFEST=(compiler=='msvc'and version>=8)or(compiler=='wsdk'and version>=6)or(compiler=='intel'and version>=11)
+	cxx=None
+	if v['CXX']:cxx=v['CXX']
+	elif'CXX'in conf.environ:cxx=conf.environ['CXX']
+	cxx=conf.find_program(compiler_name,var='CXX',path_list=path)
+	cxx=conf.cmd_to_list(cxx)
+	env=dict(conf.environ)
+	if path:env.update(PATH=';'.join(path))
+	if not conf.cmd_and_log(cxx+['/nologo','/help'],env=env):
+		conf.fatal('the msvc compiler could not be identified')
+	v['CC']=v['CXX']=cxx
+	v['CC_NAME']=v['CXX_NAME']='msvc'
+	if not v['LINK_CXX']:
+		link=conf.find_program(linker_name,path_list=path)
+		if link:v['LINK_CXX']=link
+		else:conf.fatal('%s was not found (linker)'%linker_name)
+		v['LINK']=link
+	if not v['LINK_CC']:
+		v['LINK_CC']=v['LINK_CXX']
+	if not v['AR']:
+		stliblink=conf.find_program(lib_name,path_list=path,var='AR')
+		if not stliblink:return
+		v['ARFLAGS']=['/NOLOGO']
+	if v.MSVC_MANIFEST:
+		mt=conf.find_program('MT',path_list=path,var='MT')
+		v['MTFLAGS']=['/NOLOGO']
+	conf.load('winres')
+	if not conf.env['WINRC']:
+		warn('Resource compiler not found. Compiling resource file is disabled')
+def visual_studio_add_flags(self):
+	v=self.env
+	try:v.prepend_value('INCLUDES',self.environ['INCLUDE'].split(';'))
+	except:pass
+	try:v.prepend_value('LIBPATH',self.environ['LIB'].split(';'))
+	except:pass
+def msvc_common_flags(conf):
+	v=conf.env
+	v['DEST_BINFMT']='pe'
+	v.append_value('CFLAGS',['/nologo'])
+	v.append_value('CXXFLAGS',['/nologo'])
+	v['DEFINES_ST']='/D%s'
+	v['CC_SRC_F']=''
+	v['CC_TGT_F']=['/c','/Fo']
+	if v['MSVC_VERSION']>=8:
+		v['CC_TGT_F']=['/FC']+v['CC_TGT_F']
+	v['CXX_SRC_F']=''
+	v['CXX_TGT_F']=['/c','/Fo']
+	if v['MSVC_VERSION']>=8:
+		v['CXX_TGT_F']=['/FC']+v['CXX_TGT_F']
+	v['CPPPATH_ST']='/I%s'
+	v['AR_TGT_F']=v['CCLNK_TGT_F']=v['CXXLNK_TGT_F']='/OUT:'
+	v['CFLAGS_CONSOLE']=v['CXXFLAGS_CONSOLE']=['/SUBSYSTEM:CONSOLE']
+	v['CFLAGS_NATIVE']=v['CXXFLAGS_NATIVE']=['/SUBSYSTEM:NATIVE']
+	v['CFLAGS_POSIX']=v['CXXFLAGS_POSIX']=['/SUBSYSTEM:POSIX']
+	v['CFLAGS_WINDOWS']=v['CXXFLAGS_WINDOWS']=['/SUBSYSTEM:WINDOWS']
+	v['CFLAGS_WINDOWSCE']=v['CXXFLAGS_WINDOWSCE']=['/SUBSYSTEM:WINDOWSCE']
+	v['CFLAGS_CRT_MULTITHREADED']=v['CXXFLAGS_CRT_MULTITHREADED']=['/MT']
+	v['CFLAGS_CRT_MULTITHREADED_DLL']=v['CXXFLAGS_CRT_MULTITHREADED_DLL']=['/MD']
+	v['CFLAGS_CRT_MULTITHREADED_DBG']=v['CXXFLAGS_CRT_MULTITHREADED_DBG']=['/MTd']
+	v['CFLAGS_CRT_MULTITHREADED_DLL_DBG']=v['CXXFLAGS_CRT_MULTITHREADED_DLL_DBG']=['/MDd']
+	v['LIB_ST']='%s.lib'
+	v['LIBPATH_ST']='/LIBPATH:%s'
+	v['STLIB_ST']='lib%s.lib'
+	v['STLIBPATH_ST']='/LIBPATH:%s'
+	v.append_value('LINKFLAGS',['/NOLOGO'])
+	if v['MSVC_MANIFEST']:
+		v.append_value('LINKFLAGS',['/MANIFEST'])
+	v['CFLAGS_cshlib']=[]
+	v['CXXFLAGS_cxxshlib']=[]
+	v['LINKFLAGS_cshlib']=v['LINKFLAGS_cxxshlib']=['/DLL']
+	v['cshlib_PATTERN']=v['cxxshlib_PATTERN']='%s.dll'
+	v['implib_PATTERN']='%s.lib'
+	v['IMPLIB_ST']='/IMPLIB:%s'
+	v['LINKFLAGS_cstlib']=[]
+	v['cstlib_PATTERN']=v['cxxstlib_PATTERN']='lib%s.lib'
+	v['cprogram_PATTERN']=v['cxxprogram_PATTERN']='%s.exe'
+def apply_flags_msvc(self):
+	if self.env.CC_NAME!='msvc'or not getattr(self,'link_task',None):
+		return
+	is_static=isinstance(self.link_task,ccroot.stlink_task)
+	subsystem=getattr(self,'subsystem','')
+	if subsystem:
+		subsystem='/subsystem:%s'%subsystem
+		flags=is_static and'ARFLAGS'or'LINKFLAGS'
+		self.env.append_value(flags,subsystem)
+	if not is_static:
+		for f in self.env.LINKFLAGS:
+			d=f.lower()
+			if d[1:]=='debug':
+				pdbnode=self.link_task.outputs[0].change_ext('.pdb')
+				self.link_task.outputs.append(pdbnode)
+				try:
+					self.install_task.source.append(pdbnode)
+				except AttributeError:
+					pass
+				break
+def apply_manifest(self):
+	if self.env.CC_NAME=='msvc'and self.env.MSVC_MANIFEST and getattr(self,'link_task',None):
+		out_node=self.link_task.outputs[0]
+		man_node=out_node.parent.find_or_declare(out_node.name+'.manifest')
+		self.link_task.outputs.append(man_node)
+		self.link_task.do_manifest=True
+def exec_mf(self):
+	env=self.env
+	mtool=env['MT']
+	if not mtool:
+		return 0
+	self.do_manifest=False
+	outfile=self.outputs[0].abspath()
+	manifest=None
+	for out_node in self.outputs:
+		if out_node.name.endswith('.manifest'):
+			manifest=out_node.abspath()
+			break
+	if manifest is None:
+		return 0
+	mode=''
+	if'cprogram'in self.generator.features or'cxxprogram'in self.generator.features:
+		mode='1'
+	elif'cshlib'in self.generator.features or'cxxshlib'in self.generator.features:
+		mode='2'
+	debug('msvc: embedding manifest in mode %r'%mode)
+	lst=[]
+	lst.append(env['MT'])
+	lst.extend(Utils.to_list(env['MTFLAGS']))
+	lst.extend(['-manifest',manifest])
+	lst.append('-outputresource:%s;%s'%(outfile,mode))
+	lst=[lst]
+	return self.exec_command(*lst)
+def quote_response_command(self,flag):
+	if flag.find(' ')>-1:
+		for x in('/LIBPATH:','/IMPLIB:','/OUT:','/I'):
+			if flag.startswith(x):
+				flag='%s"%s"'%(x,flag[len(x):])
+				break
+		else:
+			flag='"%s"'%flag
+	return flag
+def exec_response_command(self,cmd,**kw):
+	try:
+		tmp=None
+		if sys.platform.startswith('win')and isinstance(cmd,list)and len(' '.join(cmd))>=8192:
+			program=cmd[0]
+			cmd=[self.quote_response_command(x)for x in cmd]
+			(fd,tmp)=tempfile.mkstemp()
+			os.write(fd,'\r\n'.join(i.replace('\\','\\\\')for i in cmd[1:]))
+			os.close(fd)
+			cmd=[program,'@'+tmp]
+		ret=self.generator.bld.exec_command(cmd,**kw)
+	finally:
+		if tmp:
+			try:
+				os.remove(tmp)
+			except:
+				pass
+	return ret
+def exec_command_msvc(self,*k,**kw):
+	if self.env['CC_NAME']=='msvc':
+		if isinstance(k[0],list):
+			lst=[]
+			carry=''
+			for a in k[0]:
+				if a=='/Fo'or a=='/doc'or a[-1]==':':
+					carry=a
+				else:
+					lst.append(carry+a)
+					carry=''
+			k=[lst]
+		if self.env['PATH']:
+			env=dict(os.environ)
+			env.update(PATH=';'.join(self.env['PATH']))
+			kw['env']=env
+	bld=self.generator.bld
+	try:
+		if not kw.get('cwd',None):
+			kw['cwd']=bld.cwd
+	except AttributeError:
+		bld.cwd=kw['cwd']=bld.variant_dir
+	ret=self.exec_response_command(k[0],**kw)
+	if not ret and getattr(self,'do_manifest',None):
+		ret=self.exec_mf()
+	return ret
+for k in'c cxx cprogram cxxprogram cshlib cxxshlib cstlib cxxstlib'.split():
+	cls=Task.classes.get(k,None)
+	if cls:
+		cls.exec_command=exec_command_msvc
+		cls.exec_response_command=exec_response_command
+		cls.quote_response_command=quote_response_command
+		cls.exec_mf=exec_mf
+
+conf(get_msvc_version)
+conf(gather_wsdk_versions)
+conf(gather_msvc_targets)
+conf(gather_wince_targets)
+conf(gather_msvc_versions)
+conf(gather_icl_versions)
+conf(get_msvc_versions)
+conf(print_all_msvc_detected)
+conf(detect_msvc)
+conf(find_lt_names_msvc)
+conf(libname_msvc)
+conf(check_lib_msvc)
+conf(check_libs_msvc)
+conf(no_autodetect)
+conf(autodetect)
+conf(find_msvc)
+conf(visual_studio_add_flags)
+conf(msvc_common_flags)
+after_method('apply_link')(apply_flags_msvc)
+feature('c','cxx')(apply_flags_msvc)
+feature('cprogram','cshlib','cxxprogram','cxxshlib')(apply_manifest)
+after_method('apply_link')(apply_manifest)
\ No newline at end of file
diff --git a/waflib/Tools/nasm.py b/waflib/Tools/nasm.py
new file mode 100644
index 0000000..22717d3
--- /dev/null
+++ b/waflib/Tools/nasm.py
@@ -0,0 +1,14 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import waflib.Tools.asm
+from waflib.TaskGen import feature
+def apply_nasm_vars(self):
+	self.env.append_value('ASFLAGS',self.to_list(getattr(self,'nasm_flags',[])))
+def configure(conf):
+	nasm=conf.find_program(['nasm','yasm'],var='AS')
+	conf.env.AS_TGT_F=['-o']
+	conf.env.ASLNK_TGT_F=['-o']
+
+feature('asm')(apply_nasm_vars)
\ No newline at end of file
diff --git a/waflib/Tools/perl.py b/waflib/Tools/perl.py
new file mode 100644
index 0000000..0f66333
--- /dev/null
+++ b/waflib/Tools/perl.py
@@ -0,0 +1,81 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os
+from waflib import Task,Options,Utils
+from waflib.Configure import conf
+from waflib.TaskGen import extension,feature,before_method
+def init_perlext(self):
+	self.uselib=self.to_list(getattr(self,'uselib',[]))
+	if not'PERLEXT'in self.uselib:self.uselib.append('PERLEXT')
+	self.env['cshlib_PATTERN']=self.env['cxxshlib_PATTERN']=self.env['perlext_PATTERN']
+def xsubpp_file(self,node):
+	outnode=node.change_ext('.c')
+	self.create_task('xsubpp',node,outnode)
+	self.source.append(outnode)
+class xsubpp(Task.Task):
+	run_str='${PERL} ${XSUBPP} -noprototypes -typemap ${EXTUTILS_TYPEMAP} ${SRC} > ${TGT}'
+	color='BLUE'
+	ext_out=['.h']
+def check_perl_version(self,minver=None):
+	res=True
+	if minver:
+		cver='.'.join(map(str,minver))
+	else:
+		cver=''
+	self.start_msg('Checking for minimum perl version %s'%cver)
+	perl=getattr(Options.options,'perlbinary',None)
+	if not perl:
+		perl=self.find_program('perl',var='PERL')
+	if not perl:
+		self.end_msg("Perl not found",color="YELLOW")
+		return False
+	self.env['PERL']=perl
+	version=self.cmd_and_log([perl,"-e",'printf \"%vd\", $^V'])
+	if not version:
+		res=False
+		version="Unknown"
+	elif not minver is None:
+		ver=tuple(map(int,version.split(".")))
+		if ver<minver:
+			res=False
+	self.end_msg(version,color=res and"GREEN"or"YELLOW")
+	return res
+def check_perl_module(self,module):
+	cmd=[self.env['PERL'],'-e','use %s'%module]
+	self.start_msg('perl module %s'%module)
+	try:
+		r=self.cmd_and_log(cmd)
+	except:
+		self.end_msg(False)
+		return None
+	self.end_msg(r or True)
+	return r
+def check_perl_ext_devel(self):
+	env=self.env
+	perl=env.PERL
+	if not perl:
+		self.fatal('find perl first')
+	def read_out(cmd):
+		return Utils.to_list(self.cmd_and_log(perl+cmd))
+	env['LINKFLAGS_PERLEXT']=read_out(" -MConfig -e'print $Config{lddlflags}'")
+	env['INCLUDES_PERLEXT']=read_out(" -MConfig -e'print \"$Config{archlib}/CORE\"'")
+	env['CFLAGS_PERLEXT']=read_out(" -MConfig -e'print \"$Config{ccflags} $Config{cccdlflags}\"'")
+	env['XSUBPP']=read_out(" -MConfig -e'print \"$Config{privlib}/ExtUtils/xsubpp$Config{exe_ext}\"'")
+	env['EXTUTILS_TYPEMAP']=read_out(" -MConfig -e'print \"$Config{privlib}/ExtUtils/typemap\"'")
+	if not getattr(Options.options,'perlarchdir',None):
+		env['ARCHDIR_PERL']=self.cmd_and_log(perl+" -MConfig -e'print $Config{sitearch}'")
+	else:
+		env['ARCHDIR_PERL']=getattr(Options.options,'perlarchdir')
+	env['perlext_PATTERN']='%s.'+self.cmd_and_log(perl+" -MConfig -e'print $Config{dlext}'")
+def options(opt):
+	opt.add_option('--with-perl-binary',type='string',dest='perlbinary',help='Specify alternate perl binary',default=None)
+	opt.add_option('--with-perl-archdir',type='string',dest='perlarchdir',help='Specify directory where to install arch specific files',default=None)
+
+before_method('apply_incpaths','apply_link','propagate_uselib_vars')(init_perlext)
+feature('perlext')(init_perlext)
+extension('.xs')(xsubpp_file)
+conf(check_perl_version)
+conf(check_perl_module)
+conf(check_perl_ext_devel)
\ No newline at end of file
diff --git a/waflib/Tools/python.py b/waflib/Tools/python.py
new file mode 100644
index 0000000..cdaff84
--- /dev/null
+++ b/waflib/Tools/python.py
@@ -0,0 +1,336 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os,sys
+from waflib import Utils,Options,Errors
+from waflib.Logs import debug,warn,info,error
+from waflib.TaskGen import extension,before_method,after_method,feature
+from waflib.Configure import conf
+FRAG='''
+#include <Python.h>
+#ifdef __cplusplus
+extern "C" {
+#endif
+	void Py_Initialize(void);
+	void Py_Finalize(void);
+#ifdef __cplusplus
+}
+#endif
+int main()
+{
+   Py_Initialize();
+   Py_Finalize();
+   return 0;
+}
+'''
+INST='''
+import sys, py_compile
+py_compile.compile(sys.argv[1], sys.argv[2], sys.argv[3])
+'''
+DISTUTILS_IMP=['from distutils.sysconfig import get_config_var, get_python_lib']
+def process_py(self,node):
+	try:
+		if not self.bld.is_install:
+			return
+	except:
+		return
+	try:
+		if not self.install_path:
+			return
+	except AttributeError:
+		self.install_path='${PYTHONDIR}'
+	def inst_py(ctx):
+		install_from=getattr(self,'install_from',None)
+		if install_from:
+			install_from=self.path.find_dir(install_from)
+		install_pyfile(self,node,install_from)
+	self.bld.add_post_fun(inst_py)
+def install_pyfile(self,node,install_from=None):
+	from_node=install_from or node.parent
+	tsk=self.bld.install_as(self.install_path+'/'+node.path_from(from_node),node,postpone=False)
+	path=tsk.get_install_path()
+	if self.bld.is_install<0:
+		info("+ removing byte compiled python files")
+		for x in'co':
+			try:
+				os.remove(path+x)
+			except OSError:
+				pass
+	if self.bld.is_install>0:
+		try:
+			st1=os.stat(path)
+		except:
+			error('The python file is missing, this should not happen')
+		for x in['c','o']:
+			do_inst=self.env['PY'+x.upper()]
+			try:
+				st2=os.stat(path+x)
+			except OSError:
+				pass
+			else:
+				if st1.st_mtime<=st2.st_mtime:
+					do_inst=False
+			if do_inst:
+				lst=(x=='o')and[self.env['PYFLAGS_OPT']]or[]
+				(a,b,c)=(path,path+x,tsk.get_install_path(destdir=False)+x)
+				argv=self.env['PYTHON']+lst+['-c',INST,a,b,c]
+				info('+ byte compiling %r'%(path+x))
+				env=self.env.env or None
+				ret=Utils.subprocess.Popen(argv,env=env).wait()
+				if ret:
+					raise Errors.WafError('py%s compilation failed %r'%(x,path))
+def feature_py(self):
+	pass
+def init_pyext(self):
+	try:
+		if not self.install_path:
+			return
+	except AttributeError:
+		self.install_path='${PYTHONARCHDIR}'
+	self.uselib=self.to_list(getattr(self,'uselib',[]))
+	if not'PYEXT'in self.uselib:
+		self.uselib.append('PYEXT')
+	self.env['cshlib_PATTERN']=self.env['cxxshlib_PATTERN']=self.env['macbundle_PATTERN']=self.env['pyext_PATTERN']
+def set_bundle(self):
+	if Utils.unversioned_sys_platform()=='darwin':
+		self.mac_bundle=True
+def init_pyembed(self):
+	self.uselib=self.to_list(getattr(self,'uselib',[]))
+	if not'PYEMBED'in self.uselib:
+		self.uselib.append('PYEMBED')
+def get_python_variables(self,variables,imports=None):
+	if not imports:
+		try:
+			imports=self.python_imports
+		except AttributeError:
+			imports=DISTUTILS_IMP
+	program=list(imports)
+	program.append('')
+	for v in variables:
+		program.append("print(repr(%s))"%v)
+	os_env=dict(os.environ)
+	try:
+		del os_env['MACOSX_DEPLOYMENT_TARGET']
+	except KeyError:
+		pass
+	try:
+		out=self.cmd_and_log(self.env.PYTHON+['-c','\n'.join(program)],env=os_env)
+	except Errors.WafError:
+		self.fatal('The distutils module is unusable: install "python-devel"?')
+	return_values=[]
+	for s in out.split('\n'):
+		s=s.strip()
+		if not s:
+			continue
+		if s=='None':
+			return_values.append(None)
+		elif s[0]=="'"and s[-1]=="'":
+			return_values.append(s[1:-1])
+		elif s[0].isdigit():
+			return_values.append(int(s))
+		else:break
+	return return_values
+def check_python_headers(conf):
+	if not conf.env['CC_NAME']and not conf.env['CXX_NAME']:
+		conf.fatal('load a compiler first (gcc, g++, ..)')
+	if not conf.env['PYTHON_VERSION']:
+		conf.check_python_version()
+	env=conf.env
+	pybin=conf.env.PYTHON
+	if not pybin:
+		conf.fatal('could not find the python executable')
+	v='prefix SO LDFLAGS LIBDIR LIBPL INCLUDEPY Py_ENABLE_SHARED MACOSX_DEPLOYMENT_TARGET LDSHARED CFLAGS'.split()
+	try:
+		lst=conf.get_python_variables(["get_config_var('%s') or ''"%x for x in v])
+	except RuntimeError:
+		conf.fatal("Python development headers not found (-v for details).")
+	vals=['%s = %r'%(x,y)for(x,y)in zip(v,lst)]
+	conf.to_log("Configuration returned from %r:\n%r\n"%(pybin,'\n'.join(vals)))
+	dct=dict(zip(v,lst))
+	x='MACOSX_DEPLOYMENT_TARGET'
+	if dct[x]:
+		conf.env[x]=conf.environ[x]=dct[x]
+	env['pyext_PATTERN']='%s'+dct['SO']
+	all_flags=dct['LDFLAGS']+' '+dct['CFLAGS']
+	conf.parse_flags(all_flags,'PYEMBED')
+	all_flags=dct['LDFLAGS']+' '+dct['LDSHARED']+' '+dct['CFLAGS']
+	conf.parse_flags(all_flags,'PYEXT')
+	result=None
+	for name in('python'+env['PYTHON_VERSION'],'python'+env['PYTHON_VERSION'].replace('.','')):
+		if not result and env['LIBPATH_PYEMBED']:
+			path=env['LIBPATH_PYEMBED']
+			conf.to_log("\n\n# Trying default LIBPATH_PYEMBED: %r\n"%path)
+			result=conf.check(lib=name,uselib='PYEMBED',libpath=path,mandatory=False,msg='Checking for library %s in LIBPATH_PYEMBED'%name)
+		if not result and dct['LIBDIR']:
+			path=[dct['LIBDIR']]
+			conf.to_log("\n\n# try again with -L$python_LIBDIR: %r\n"%path)
+			result=conf.check(lib=name,uselib='PYEMBED',libpath=path,mandatory=False,msg='Checking for library %s in LIBDIR'%name)
+		if not result and dct['LIBPL']:
+			path=[dct['LIBPL']]
+			conf.to_log("\n\n# try again with -L$python_LIBPL (some systems don't install the python library in $prefix/lib)\n")
+			result=conf.check(lib=name,uselib='PYEMBED',libpath=path,mandatory=False,msg='Checking for library %s in python_LIBPL'%name)
+		if not result:
+			path=[os.path.join(dct['prefix'],"libs")]
+			conf.to_log("\n\n# try again with -L$prefix/libs, and pythonXY name rather than pythonX.Y (win32)\n")
+			result=conf.check(lib=name,uselib='PYEMBED',libpath=path,mandatory=False,msg='Checking for library %s in $prefix/libs'%name)
+		if result:
+			break
+	if result:
+		env['LIBPATH_PYEMBED']=path
+		env.append_value('LIB_PYEMBED',[name])
+	else:
+		conf.to_log("\n\n### LIB NOT FOUND\n")
+	if(Utils.is_win32 or sys.platform.startswith('os2')or dct['Py_ENABLE_SHARED']):
+		env['LIBPATH_PYEXT']=env['LIBPATH_PYEMBED']
+		env['LIB_PYEXT']=env['LIB_PYEMBED']
+	num='.'.join(env['PYTHON_VERSION'].split('.')[:2])
+	conf.find_program(['python%s-config'%num,'python-config-%s'%num,'python%sm-config'%num],var='PYTHON_CONFIG',mandatory=False)
+	includes=[]
+	if conf.env.PYTHON_CONFIG:
+		for incstr in conf.cmd_and_log([conf.env.PYTHON_CONFIG,'--includes']).strip().split():
+			if(incstr.startswith('-I')or incstr.startswith('/I')):
+				incstr=incstr[2:]
+			if incstr not in includes:
+				includes.append(incstr)
+		conf.to_log("Include path for Python extensions (found via python-config --includes): %r\n"%(includes,))
+		env['INCLUDES_PYEXT']=includes
+		env['INCLUDES_PYEMBED']=includes
+	else:
+		conf.to_log("Include path for Python extensions ""(found via distutils module): %r\n"%(dct['INCLUDEPY'],))
+		env['INCLUDES_PYEXT']=[dct['INCLUDEPY']]
+		env['INCLUDES_PYEMBED']=[dct['INCLUDEPY']]
+	if env['CC_NAME']=='gcc':
+		env.append_value('CFLAGS_PYEMBED',['-fno-strict-aliasing'])
+		env.append_value('CFLAGS_PYEXT',['-fno-strict-aliasing'])
+	if env['CXX_NAME']=='gcc':
+		env.append_value('CXXFLAGS_PYEMBED',['-fno-strict-aliasing'])
+		env.append_value('CXXFLAGS_PYEXT',['-fno-strict-aliasing'])
+	if env.CC_NAME=="msvc":
+		from distutils.msvccompiler import MSVCCompiler
+		dist_compiler=MSVCCompiler()
+		dist_compiler.initialize()
+		env.append_value('CFLAGS_PYEXT',dist_compiler.compile_options)
+		env.append_value('CXXFLAGS_PYEXT',dist_compiler.compile_options)
+		env.append_value('LINKFLAGS_PYEXT',dist_compiler.ldflags_shared)
+	try:
+		conf.check(header_name='Python.h',define_name='HAVE_PYTHON_H',uselib='PYEMBED',fragment=FRAG,errmsg='Could not find the python development headers')
+	except conf.errors.ConfigurationError:
+		conf.check_cfg(path=conf.env.PYTHON_CONFIG,package='',uselib_store='PYEMBED',args=['--cflags','--libs'])
+		conf.check(header_name='Python.h',define_name='HAVE_PYTHON_H',msg='Getting the python flags from python-config',uselib='PYEMBED',fragment=FRAG,errmsg='Could not find the python development headers elsewhere')
+def check_python_version(conf,minver=None):
+	assert minver is None or isinstance(minver,tuple)
+	pybin=conf.env['PYTHON']
+	if not pybin:
+		conf.fatal('could not find the python executable')
+	cmd=pybin+['-c','import sys\nfor x in sys.version_info: print(str(x))']
+	debug('python: Running python command %r'%cmd)
+	lines=conf.cmd_and_log(cmd).split()
+	assert len(lines)==5,"found %i lines, expected 5: %r"%(len(lines),lines)
+	pyver_tuple=(int(lines[0]),int(lines[1]),int(lines[2]),lines[3],int(lines[4]))
+	result=(minver is None)or(pyver_tuple>=minver)
+	if result:
+		pyver='.'.join([str(x)for x in pyver_tuple[:2]])
+		conf.env['PYTHON_VERSION']=pyver
+		if'PYTHONDIR'in conf.environ:
+			pydir=conf.environ['PYTHONDIR']
+		else:
+			if Utils.is_win32:
+				(python_LIBDEST,pydir)=conf.get_python_variables(["get_config_var('LIBDEST') or ''","get_python_lib(standard_lib=0, prefix=%r) or ''"%conf.env['PREFIX']])
+			else:
+				python_LIBDEST=None
+				(pydir,)=conf.get_python_variables(["get_python_lib(standard_lib=0, prefix=%r) or ''"%conf.env['PREFIX']])
+			if python_LIBDEST is None:
+				if conf.env['LIBDIR']:
+					python_LIBDEST=os.path.join(conf.env['LIBDIR'],"python"+pyver)
+				else:
+					python_LIBDEST=os.path.join(conf.env['PREFIX'],"lib","python"+pyver)
+		if'PYTHONARCHDIR'in conf.environ:
+			pyarchdir=conf.environ['PYTHONARCHDIR']
+		else:
+			(pyarchdir,)=conf.get_python_variables(["get_python_lib(plat_specific=1, standard_lib=0, prefix=%r) or ''"%conf.env['PREFIX']])
+			if not pyarchdir:
+				pyarchdir=pydir
+		if hasattr(conf,'define'):
+			conf.define('PYTHONDIR',pydir)
+			conf.define('PYTHONARCHDIR',pyarchdir)
+		conf.env['PYTHONDIR']=pydir
+		conf.env['PYTHONARCHDIR']=pyarchdir
+	pyver_full='.'.join(map(str,pyver_tuple[:3]))
+	if minver is None:
+		conf.msg('Checking for python version',pyver_full)
+	else:
+		minver_str='.'.join(map(str,minver))
+		conf.msg('Checking for python version',pyver_tuple,">= %s"%(minver_str,)and'GREEN'or'YELLOW')
+	if not result:
+		conf.fatal('The python version is too old, expecting %r'%(minver,))
+PYTHON_MODULE_TEMPLATE='''
+import %s as current_module
+version = getattr(current_module, '__version__', None)
+if version is not None:
+    print(str(version))
+else:
+    print('unknown version')
+'''
+def check_python_module(conf,module_name,condition=''):
+	msg='Python module %s'%module_name
+	if condition:
+		msg='%s (%s)'%(msg,condition)
+	conf.start_msg(msg)
+	try:
+		ret=conf.cmd_and_log(conf.env['PYTHON']+['-c',PYTHON_MODULE_TEMPLATE%module_name])
+	except Exception:
+		conf.end_msg(False)
+		conf.fatal('Could not find the python module %r'%module_name)
+	ret=ret.strip()
+	if condition:
+		conf.end_msg(ret)
+		if ret=='unknown version':
+			conf.fatal('Could not check the %s version'%module_name)
+		from distutils.version import LooseVersion
+		def num(*k):
+			if isinstance(k[0],int):
+				return LooseVersion('.'.join([str(x)for x in k]))
+			else:
+				return LooseVersion(k[0])
+		d={'num':num,'ver':LooseVersion(ret)}
+		ev=eval(condition,{},d)
+		if not ev:
+			conf.fatal('The %s version does not satisfy the requirements'%module_name)
+	else:
+		if ret=='unknown version':
+			conf.end_msg(True)
+		else:
+			conf.end_msg(ret)
+def configure(conf):
+	try:
+		conf.find_program('python',var='PYTHON')
+	except conf.errors.ConfigurationError:
+		warn("could not find a python executable, setting to sys.executable '%s'"%sys.executable)
+		conf.env.PYTHON=sys.executable
+	if conf.env.PYTHON!=sys.executable:
+		warn("python executable '%s' different from sys.executable '%s'"%(conf.env.PYTHON,sys.executable))
+	conf.env.PYTHON=conf.cmd_to_list(conf.env.PYTHON)
+	v=conf.env
+	v['PYCMD']='"import sys, py_compile;py_compile.compile(sys.argv[1], sys.argv[2])"'
+	v['PYFLAGS']=''
+	v['PYFLAGS_OPT']='-O'
+	v['PYC']=getattr(Options.options,'pyc',1)
+	v['PYO']=getattr(Options.options,'pyo',1)
+def options(opt):
+	opt.add_option('--nopyc',action='store_false',default=1,help='Do not install bytecode compiled .pyc files (configuration) [Default:install]',dest='pyc')
+	opt.add_option('--nopyo',action='store_false',default=1,help='Do not install optimised compiled .pyo files (configuration) [Default:install]',dest='pyo')
+
+extension('.py')(process_py)
+feature('py')(feature_py)
+feature('pyext')(init_pyext)
+before_method('propagate_uselib_vars','apply_link')(init_pyext)
+after_method('apply_bundle')(init_pyext)
+feature('pyext')(set_bundle)
+before_method('apply_link','apply_bundle')(set_bundle)
+before_method('propagate_uselib_vars')(init_pyembed)
+feature('pyembed')(init_pyembed)
+conf(get_python_variables)
+conf(check_python_headers)
+conf(check_python_version)
+conf(check_python_module)
\ No newline at end of file
diff --git a/waflib/Tools/qt4.py b/waflib/Tools/qt4.py
new file mode 100644
index 0000000..1ee9724
--- /dev/null
+++ b/waflib/Tools/qt4.py
@@ -0,0 +1,434 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import sys
+if sys.hexversion < 0x020400f0: from sets import Set as set
+try:
+	from xml.sax import make_parser
+	from xml.sax.handler import ContentHandler
+except ImportError:
+	has_xml=False
+	ContentHandler=object
+else:
+	has_xml=True
+import os,sys
+from waflib.Tools import c_preproc,cxx
+from waflib import Task,Utils,Options,Errors
+from waflib.TaskGen import feature,after_method,extension
+from waflib.Configure import conf
+from waflib import Logs
+MOC_H=['.h','.hpp','.hxx','.hh']
+EXT_RCC=['.qrc']
+EXT_UI=['.ui']
+EXT_QT4=['.cpp','.cc','.cxx','.C']
+QT4_LIBS="QtCore QtGui QtUiTools QtNetwork QtOpenGL QtSql QtSvg QtTest QtXml QtXmlPatterns QtWebKit Qt3Support QtHelp QtScript QtDeclarative"
+class qxx(cxx.cxx):
+	def __init__(self,*k,**kw):
+		Task.Task.__init__(self,*k,**kw)
+		self.moc_done=0
+	def scan(self):
+		(nodes,names)=c_preproc.scan(self)
+		for x in nodes:
+			if x.name.endswith('.moc'):
+				nodes.remove(x)
+				names.append(x.path_from(self.inputs[0].parent.get_bld()))
+		return(nodes,names)
+	def runnable_status(self):
+		if self.moc_done:
+			return Task.Task.runnable_status(self)
+		else:
+			for t in self.run_after:
+				if not t.hasrun:
+					return Task.ASK_LATER
+			self.add_moc_tasks()
+			return Task.Task.runnable_status(self)
+	def add_moc_tasks(self):
+		node=self.inputs[0]
+		bld=self.generator.bld
+		try:
+			self.signature()
+		except KeyError:
+			pass
+		else:
+			delattr(self,'cache_sig')
+		moctasks=[]
+		mocfiles=[]
+		try:
+			tmp_lst=bld.raw_deps[self.uid()]
+			bld.raw_deps[self.uid()]=[]
+		except KeyError:
+			tmp_lst=[]
+		for d in tmp_lst:
+			if not d.endswith('.moc'):
+				continue
+			if d in mocfiles:
+				Logs.error("paranoia owns")
+				continue
+			mocfiles.append(d)
+			h_node=None
+			try:ext=Options.options.qt_header_ext.split()
+			except AttributeError:pass
+			if not ext:ext=MOC_H
+			base2=d[:-4]
+			for x in[node.parent]+self.generator.includes_nodes:
+				for e in ext:
+					h_node=x.find_node(base2+e)
+					if h_node:
+						break
+				if h_node:
+					m_node=h_node.change_ext('.moc')
+					break
+			else:
+				for k in EXT_QT4:
+					if base2.endswith(k):
+						for x in[node.parent]+self.generator.includes_nodes:
+							h_node=x.find_node(base2)
+							if h_node:
+								break
+					if h_node:
+						m_node=h_node.change_ext(k+'.moc')
+						break
+			if not h_node:
+				raise Errors.WafError('no header found for %r which is a moc file'%d)
+			bld.node_deps[(self.inputs[0].parent.abspath(),m_node.name)]=h_node
+			task=Task.classes['moc'](env=self.env,generator=self.generator)
+			task.set_inputs(h_node)
+			task.set_outputs(m_node)
+			gen=bld.producer
+			gen.outstanding.insert(0,task)
+			gen.total+=1
+			moctasks.append(task)
+		tmp_lst=bld.raw_deps[self.uid()]=mocfiles
+		lst=bld.node_deps.get(self.uid(),())
+		for d in lst:
+			name=d.name
+			if name.endswith('.moc'):
+				task=Task.classes['moc'](env=self.env,generator=self.generator)
+				task.set_inputs(bld.node_deps[(self.inputs[0].parent.abspath(),name)])
+				task.set_outputs(d)
+				gen=bld.producer
+				gen.outstanding.insert(0,task)
+				gen.total+=1
+				moctasks.append(task)
+		self.run_after.update(set(moctasks))
+		self.moc_done=1
+	run=Task.classes['cxx'].__dict__['run']
+class trans_update(Task.Task):
+	run_str='${QT_LUPDATE} ${SRC} -ts ${TGT}'
+	color='BLUE'
+Task.update_outputs(trans_update)
+class XMLHandler(ContentHandler):
+	def __init__(self):
+		self.buf=[]
+		self.files=[]
+	def startElement(self,name,attrs):
+		if name=='file':
+			self.buf=[]
+	def endElement(self,name):
+		if name=='file':
+			self.files.append(str(''.join(self.buf)))
+	def characters(self,cars):
+		self.buf.append(cars)
+def create_rcc_task(self,node):
+	rcnode=node.change_ext('_rc.cpp')
+	rcctask=self.create_task('rcc',node,rcnode)
+	cpptask=self.create_task('cxx',rcnode,rcnode.change_ext('.o'))
+	try:
+		self.compiled_tasks.append(cpptask)
+	except AttributeError:
+		self.compiled_tasks=[cpptask]
+	return cpptask
+def create_uic_task(self,node):
+	uictask=self.create_task('ui4',node)
+	uictask.outputs=[self.path.find_or_declare(self.env['ui_PATTERN']%node.name[:-3])]
+def add_lang(self,node):
+	self.lang=self.to_list(getattr(self,'lang',[]))+[node]
+def apply_qt4(self):
+	if getattr(self,'lang',None):
+		qmtasks=[]
+		for x in self.to_list(self.lang):
+			if isinstance(x,str):
+				x=self.path.find_resource(x+'.ts')
+			qmtasks.append(self.create_task('ts2qm',x,x.change_ext('.qm')))
+		if getattr(self,'update',None)and Options.options.trans_qt4:
+			cxxnodes=[a.inputs[0]for a in self.compiled_tasks]+[a.inputs[0]for a in self.tasks if getattr(a,'inputs',None)and a.inputs[0].name.endswith('.ui')]
+			for x in qmtasks:
+				self.create_task('trans_update',cxxnodes,x.inputs)
+		if getattr(self,'langname',None):
+			qmnodes=[x.outputs[0]for x in qmtasks]
+			rcnode=self.langname
+			if isinstance(rcnode,str):
+				rcnode=self.path.find_or_declare(rcnode+'.qrc')
+			t=self.create_task('qm2rcc',qmnodes,rcnode)
+			k=create_rcc_task(self,t.outputs[0])
+			self.link_task.inputs.append(k.outputs[0])
+	lst=[]
+	for flag in self.to_list(self.env['CXXFLAGS']):
+		if len(flag)<2:continue
+		f=flag[0:2]
+		if f in['-D','-I','/D','/I']:
+			if(f[0]=='/'):
+				lst.append('-'+flag[1:])
+			else:
+				lst.append(flag)
+	self.env['MOC_FLAGS']=lst
+def cxx_hook(self,node):
+	return self.create_compiled_task('qxx',node)
+class rcc(Task.Task):
+	color='BLUE'
+	run_str='${QT_RCC} -name ${SRC[0].name} ${SRC[0].abspath()} ${RCC_ST} -o ${TGT}'
+	ext_out=['.h']
+	def scan(self):
+		node=self.inputs[0]
+		if not has_xml:
+			Logs.error('no xml support was found, the rcc dependencies will be incomplete!')
+			return([],[])
+		parser=make_parser()
+		curHandler=XMLHandler()
+		parser.setContentHandler(curHandler)
+		fi=open(self.inputs[0].abspath())
+		parser.parse(fi)
+		fi.close()
+		nodes=[]
+		names=[]
+		root=self.inputs[0].parent
+		for x in curHandler.files:
+			nd=root.find_resource(x)
+			if nd:nodes.append(nd)
+			else:names.append(x)
+		return(nodes,names)
+class moc(Task.Task):
+	color='BLUE'
+	run_str='${QT_MOC} ${MOC_FLAGS} ${MOCCPPPATH_ST:INCPATHS} ${MOCDEFINES_ST:DEFINES} ${SRC} ${MOC_ST} ${TGT}'
+class ui4(Task.Task):
+	color='BLUE'
+	run_str='${QT_UIC} ${SRC} -o ${TGT}'
+	ext_out=['.h']
+class ts2qm(Task.Task):
+	color='BLUE'
+	run_str='${QT_LRELEASE} ${QT_LRELEASE_FLAGS} ${SRC} -qm ${TGT}'
+class qm2rcc(Task.Task):
+	color='BLUE'
+	after='ts2qm'
+	def run(self):
+		txt='\n'.join(['<file>%s</file>'%k.path_from(self.outputs[0].parent)for k in self.inputs])
+		code='<!DOCTYPE RCC><RCC version="1.0">\n<qresource>\n%s\n</qresource>\n</RCC>'%txt
+		self.outputs[0].write(code)
+def configure(self):
+	self.find_qt4_binaries()
+	self.set_qt4_libs_to_check()
+	self.find_qt4_libraries()
+	self.add_qt4_rpath()
+	self.simplify_qt4_libs()
+def find_qt4_binaries(self):
+	env=self.env
+	opt=Options.options
+	qtdir=getattr(opt,'qtdir','')
+	qtbin=getattr(opt,'qtbin','')
+	paths=[]
+	if qtdir:
+		qtbin=os.path.join(qtdir,'bin')
+	if not qtdir:
+		qtdir=self.environ.get('QT4_ROOT','')
+		qtbin=os.path.join(qtdir,'bin')
+	if qtbin:
+		paths=[qtbin]
+	if not qtdir:
+		paths=os.environ.get('PATH','').split(os.pathsep)
+		paths.append('/usr/share/qt4/bin/')
+		try:
+			lst=Utils.listdir('/usr/local/Trolltech/')
+		except OSError:
+			pass
+		else:
+			if lst:
+				lst.sort()
+				lst.reverse()
+				qtdir='/usr/local/Trolltech/%s/'%lst[0]
+				qtbin=os.path.join(qtdir,'bin')
+				paths.append(qtbin)
+	cand=None
+	prev_ver=['4','0','0']
+	for qmk in['qmake-qt4','qmake4','qmake']:
+		try:
+			qmake=self.find_program(qmk,path_list=paths)
+		except self.errors.ConfigurationError:
+			pass
+		else:
+			try:
+				version=self.cmd_and_log([qmake,'-query','QT_VERSION']).strip()
+			except self.errors.ConfigurationError:
+				pass
+			else:
+				if version:
+					new_ver=version.split('.')
+					if new_ver>prev_ver:
+						cand=qmake
+						prev_ver=new_ver
+	if cand:
+		self.env.QMAKE=cand
+	else:
+		self.fatal('Could not find qmake for qt4')
+	qtbin=self.cmd_and_log([self.env.QMAKE,'-query','QT_INSTALL_BINS']).strip()+os.sep
+	def find_bin(lst,var):
+		for f in lst:
+			try:
+				ret=self.find_program(f,path_list=paths)
+			except self.errors.ConfigurationError:
+				pass
+			else:
+				env[var]=ret
+				break
+	find_bin(['uic-qt3','uic3'],'QT_UIC3')
+	find_bin(['uic-qt4','uic'],'QT_UIC')
+	if not env['QT_UIC']:
+		self.fatal('cannot find the uic compiler for qt4')
+	try:
+		uicver=self.cmd_and_log(env['QT_UIC']+" -version 2>&1").strip()
+	except self.errors.ConfigurationError:
+		self.fatal('this uic compiler is for qt3, add uic for qt4 to your path')
+	uicver=uicver.replace('Qt User Interface Compiler ','').replace('User Interface Compiler for Qt','')
+	self.msg('Checking for uic version','%s'%uicver)
+	if uicver.find(' 3.')!=-1:
+		self.fatal('this uic compiler is for qt3, add uic for qt4 to your path')
+	find_bin(['moc-qt4','moc'],'QT_MOC')
+	find_bin(['rcc'],'QT_RCC')
+	find_bin(['lrelease-qt4','lrelease'],'QT_LRELEASE')
+	find_bin(['lupdate-qt4','lupdate'],'QT_LUPDATE')
+	env['UIC3_ST']='%s -o %s'
+	env['UIC_ST']='%s -o %s'
+	env['MOC_ST']='-o'
+	env['ui_PATTERN']='ui_%s.h'
+	env['QT_LRELEASE_FLAGS']=['-silent']
+	env.MOCCPPPATH_ST='-I%s'
+	env.MOCDEFINES_ST='-D%s'
+def find_qt4_libraries(self):
+	qtlibs=getattr(Options.options,'qtlibs','')
+	if not qtlibs:
+		try:
+			qtlibs=self.cmd_and_log([self.env.QMAKE,'-query','QT_INSTALL_LIBS']).strip()
+		except Errors.WafError:
+			qtdir=self.cmd_and_log([self.env.QMAKE,'-query','QT_INSTALL_PREFIX']).strip()+os.sep
+			qtlibs=os.path.join(qtdir,'lib')
+	self.msg('Found the Qt4 libraries in',qtlibs)
+	qtincludes=self.cmd_and_log([self.env.QMAKE,'-query','QT_INSTALL_HEADERS']).strip()
+	env=self.env
+	if not'PKG_CONFIG_PATH'in os.environ:
+		os.environ['PKG_CONFIG_PATH']='%s:%s/pkgconfig:/usr/lib/qt4/lib/pkgconfig:/opt/qt4/lib/pkgconfig:/usr/lib/qt4/lib:/opt/qt4/lib'%(qtlibs,qtlibs)
+	try:
+		self.check_cfg(atleast_pkgconfig_version='0.1')
+	except self.errors.ConfigurationError:
+		for i in self.qt4_vars:
+			uselib=i.upper()
+			if Utils.unversioned_sys_platform()=="darwin":
+				frameworkName=i+".framework"
+				qtDynamicLib=os.path.join(qtlibs,frameworkName,i)
+				if os.path.exists(qtDynamicLib):
+					env.append_unique('FRAMEWORK_'+uselib,i)
+					self.msg('Checking for %s'%i,qtDynamicLib,'GREEN')
+				else:
+					self.msg('Checking for %s'%i,False,'YELLOW')
+				env.append_unique('INCLUDES_'+uselib,os.path.join(qtlibs,frameworkName,'Headers'))
+			elif sys.platform!="win32":
+				qtDynamicLib=os.path.join(qtlibs,"lib"+i+".so")
+				qtStaticLib=os.path.join(qtlibs,"lib"+i+".a")
+				if os.path.exists(qtDynamicLib):
+					env.append_unique('LIB_'+uselib,i)
+					self.msg('Checking for %s'%i,qtDynamicLib,'GREEN')
+				elif os.path.exists(qtStaticLib):
+					env.append_unique('LIB_'+uselib,i)
+					self.msg('Checking for %s'%i,qtStaticLib,'GREEN')
+				else:
+					self.msg('Checking for %s'%i,False,'YELLOW')
+				env.append_unique('LIBPATH_'+uselib,qtlibs)
+				env.append_unique('INCLUDES_'+uselib,qtincludes)
+				env.append_unique('INCLUDES_'+uselib,os.path.join(qtincludes,i))
+			else:
+				for k in("lib%s.a","lib%s4.a","%s.lib","%s4.lib"):
+					lib=os.path.join(qtlibs,k%i)
+					if os.path.exists(lib):
+						env.append_unique('LIB_'+uselib,i+k[k.find("%s")+2:k.find('.')])
+						self.msg('Checking for %s'%i,lib,'GREEN')
+						break
+				else:
+					self.msg('Checking for %s'%i,False,'YELLOW')
+				env.append_unique('LIBPATH_'+uselib,qtlibs)
+				env.append_unique('INCLUDES_'+uselib,qtincludes)
+				env.append_unique('INCLUDES_'+uselib,os.path.join(qtincludes,i))
+				uselib=i.upper()+"_debug"
+				for k in("lib%sd.a","lib%sd4.a","%sd.lib","%sd4.lib"):
+					lib=os.path.join(qtlibs,k%i)
+					if os.path.exists(lib):
+						env.append_unique('LIB_'+uselib,i+k[k.find("%s")+2:k.find('.')])
+						self.msg('Checking for %s'%i,lib,'GREEN')
+						break
+				else:
+					self.msg('Checking for %s'%i,False,'YELLOW')
+				env.append_unique('LIBPATH_'+uselib,qtlibs)
+				env.append_unique('INCLUDES_'+uselib,qtincludes)
+				env.append_unique('INCLUDES_'+uselib,os.path.join(qtincludes,i))
+	else:
+		for i in self.qt4_vars_debug+self.qt4_vars:
+			self.check_cfg(package=i,args='--cflags --libs',mandatory=False)
+def simplify_qt4_libs(self):
+	env=self.env
+	def process_lib(vars_,coreval):
+		for d in vars_:
+			var=d.upper()
+			if var=='QTCORE':
+				continue
+			value=env['LIBPATH_'+var]
+			if value:
+				core=env[coreval]
+				accu=[]
+				for lib in value:
+					if lib in core:
+						continue
+					accu.append(lib)
+				env['LIBPATH_'+var]=accu
+	process_lib(self.qt4_vars,'LIBPATH_QTCORE')
+	process_lib(self.qt4_vars_debug,'LIBPATH_QTCORE_DEBUG')
+def add_qt4_rpath(self):
+	env=self.env
+	if Options.options.want_rpath:
+		def process_rpath(vars_,coreval):
+			for d in vars_:
+				var=d.upper()
+				value=env['LIBPATH_'+var]
+				if value:
+					core=env[coreval]
+					accu=[]
+					for lib in value:
+						if var!='QTCORE':
+							if lib in core:
+								continue
+						accu.append('-Wl,--rpath='+lib)
+					env['RPATH_'+var]=accu
+		process_rpath(self.qt4_vars,'LIBPATH_QTCORE')
+		process_rpath(self.qt4_vars_debug,'LIBPATH_QTCORE_DEBUG')
+def set_qt4_libs_to_check(self):
+	if not hasattr(self,'qt4_vars'):
+		self.qt4_vars=QT4_LIBS
+	self.qt4_vars=Utils.to_list(self.qt4_vars)
+	if not hasattr(self,'qt4_vars_debug'):
+		self.qt4_vars_debug=[a+'_debug'for a in self.qt4_vars]
+	self.qt4_vars_debug=Utils.to_list(self.qt4_vars_debug)
+def options(opt):
+	opt.add_option('--want-rpath',action='store_true',default=False,dest='want_rpath',help='enable the rpath for qt libraries')
+	opt.add_option('--header-ext',type='string',default='',help='header extension for moc files',dest='qt_header_ext')
+	for i in'qtdir qtbin qtlibs'.split():
+		opt.add_option('--'+i,type='string',default='',dest=i)
+	opt.add_option('--translate',action="store_true",help="collect translation strings",dest="trans_qt4",default=False)
+
+extension(*EXT_RCC)(create_rcc_task)
+extension(*EXT_UI)(create_uic_task)
+extension('.ts')(add_lang)
+feature('qt4')(apply_qt4)
+after_method('apply_link')(apply_qt4)
+extension(*EXT_QT4)(cxx_hook)
+conf(find_qt4_binaries)
+conf(find_qt4_libraries)
+conf(simplify_qt4_libs)
+conf(add_qt4_rpath)
+conf(set_qt4_libs_to_check)
\ No newline at end of file
diff --git a/waflib/Tools/ruby.py b/waflib/Tools/ruby.py
new file mode 100644
index 0000000..df21a31
--- /dev/null
+++ b/waflib/Tools/ruby.py
@@ -0,0 +1,104 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os
+from waflib import Task,Options,Utils
+from waflib.TaskGen import before_method,feature,after_method,Task,extension
+from waflib.Configure import conf
+def init_rubyext(self):
+	self.install_path='${ARCHDIR_RUBY}'
+	self.uselib=self.to_list(getattr(self,'uselib',''))
+	if not'RUBY'in self.uselib:
+		self.uselib.append('RUBY')
+	if not'RUBYEXT'in self.uselib:
+		self.uselib.append('RUBYEXT')
+def apply_ruby_so_name(self):
+	self.env['cshlib_PATTERN']=self.env['cxxshlib_PATTERN']=self.env['rubyext_PATTERN']
+def check_ruby_version(self,minver=()):
+	if Options.options.rubybinary:
+		self.env.RUBY=Options.options.rubybinary
+	else:
+		self.find_program('ruby',var='RUBY')
+	ruby=self.env.RUBY
+	try:
+		version=self.cmd_and_log([ruby,'-e','puts defined?(VERSION) ? VERSION : RUBY_VERSION']).strip()
+	except:
+		self.fatal('could not determine ruby version')
+	self.env.RUBY_VERSION=version
+	try:
+		ver=tuple(map(int,version.split(".")))
+	except:
+		self.fatal('unsupported ruby version %r'%version)
+	cver=''
+	if minver:
+		if ver<minver:
+			self.fatal('ruby is too old %r'%ver)
+		cver='.'.join([str(x)for x in minver])
+	else:
+		cver=ver
+	self.msg('Checking for ruby version %s'%str(minver or''),cver)
+def check_ruby_ext_devel(self):
+	if not self.env.RUBY:
+		self.fatal('ruby detection is required first')
+	if not self.env.CC_NAME and not self.env.CXX_NAME:
+		self.fatal('load a c/c++ compiler first')
+	version=tuple(map(int,self.env.RUBY_VERSION.split(".")))
+	def read_out(cmd):
+		return Utils.to_list(self.cmd_and_log([self.env.RUBY,'-rrbconfig','-e',cmd]))
+	def read_config(key):
+		return read_out('puts Config::CONFIG[%r]'%key)
+	ruby=self.env['RUBY']
+	archdir=read_config('archdir')
+	cpppath=archdir
+	if version>=(1,9,0):
+		ruby_hdrdir=read_config('rubyhdrdir')
+		cpppath+=ruby_hdrdir
+		cpppath+=[os.path.join(ruby_hdrdir[0],read_config('arch')[0])]
+	self.check(header_name='ruby.h',includes=cpppath,errmsg='could not find ruby header file')
+	self.env.LIBPATH_RUBYEXT=read_config('libdir')
+	self.env.LIBPATH_RUBYEXT+=archdir
+	self.env.INCLUDES_RUBYEXT=cpppath
+	self.env.CFLAGS_RUBYEXT=read_config('CCDLFLAGS')
+	self.env.rubyext_PATTERN='%s.'+read_config('DLEXT')[0]
+	flags=read_config('LDSHARED')
+	while flags and flags[0][0]!='-':
+		flags=flags[1:]
+	if len(flags)>1 and flags[1]=="ppc":
+		flags=flags[2:]
+	self.env.LINKFLAGS_RUBYEXT=flags
+	self.env.LINKFLAGS_RUBYEXT+=read_config('LIBS')
+	self.env.LINKFLAGS_RUBYEXT+=read_config('LIBRUBYARG_SHARED')
+	if Options.options.rubyarchdir:
+		self.env.ARCHDIR_RUBY=Options.options.rubyarchdir
+	else:
+		self.env.ARCHDIR_RUBY=read_config('sitearchdir')[0]
+	if Options.options.rubylibdir:
+		self.env.LIBDIR_RUBY=Options.options.rubylibdir
+	else:
+		self.env.LIBDIR_RUBY=read_config('sitelibdir')[0]
+def check_ruby_module(self,module_name):
+	self.start_msg('Ruby module %s'%module_name)
+	try:
+		self.cmd_and_log([self.env['RUBY'],'-e','require \'%s\';puts 1'%module_name])
+	except:
+		self.end_msg(False)
+		self.fatal('Could not find the ruby module %r'%module_name)
+	self.end_msg(True)
+def process(self,node):
+	tsk=self.create_task('run_ruby',node)
+class run_ruby(Task.Task):
+	run_str='${RUBY} ${RBFLAGS} -I ${SRC[0].parent.abspath()} ${SRC}'
+def options(opt):
+	opt.add_option('--with-ruby-archdir',type='string',dest='rubyarchdir',help='Specify directory where to install arch specific files')
+	opt.add_option('--with-ruby-libdir',type='string',dest='rubylibdir',help='Specify alternate ruby library path')
+	opt.add_option('--with-ruby-binary',type='string',dest='rubybinary',help='Specify alternate ruby binary')
+
+feature('rubyext')(init_rubyext)
+before_method('apply_incpaths','apply_lib_vars','apply_bundle','apply_link')(init_rubyext)
+feature('rubyext')(apply_ruby_so_name)
+before_method('apply_link','propagate_uselib')(apply_ruby_so_name)
+conf(check_ruby_version)
+conf(check_ruby_ext_devel)
+conf(check_ruby_module)
+extension('.rb')(process)
\ No newline at end of file
diff --git a/waflib/Tools/suncc.py b/waflib/Tools/suncc.py
new file mode 100644
index 0000000..fcc61d1
--- /dev/null
+++ b/waflib/Tools/suncc.py
@@ -0,0 +1,54 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os
+from waflib import Utils
+from waflib.Tools import ccroot,ar
+from waflib.Configure import conf
+def find_scc(conf):
+	v=conf.env
+	cc=None
+	if v['CC']:cc=v['CC']
+	elif'CC'in conf.environ:cc=conf.environ['CC']
+	if not cc:cc=conf.find_program('cc',var='CC')
+	if not cc:conf.fatal('Could not find a Sun C compiler')
+	cc=conf.cmd_to_list(cc)
+	try:
+		conf.cmd_and_log(cc+['-flags'])
+	except:
+		conf.fatal('%r is not a Sun compiler'%cc)
+	v['CC']=cc
+	v['CC_NAME']='sun'
+def scc_common_flags(conf):
+	v=conf.env
+	v['CC_SRC_F']=[]
+	v['CC_TGT_F']=['-c','-o']
+	if not v['LINK_CC']:v['LINK_CC']=v['CC']
+	v['CCLNK_SRC_F']=''
+	v['CCLNK_TGT_F']=['-o']
+	v['CPPPATH_ST']='-I%s'
+	v['DEFINES_ST']='-D%s'
+	v['LIB_ST']='-l%s'
+	v['LIBPATH_ST']='-L%s'
+	v['STLIB_ST']='-l%s'
+	v['STLIBPATH_ST']='-L%s'
+	v['SONAME_ST']='-Wl,-h,%s'
+	v['SHLIB_MARKER']='-Bdynamic'
+	v['STLIB_MARKER']='-Bstatic'
+	v['cprogram_PATTERN']='%s'
+	v['CFLAGS_cshlib']=['-Kpic','-DPIC']
+	v['LINKFLAGS_cshlib']=['-G']
+	v['cshlib_PATTERN']='lib%s.so'
+	v['LINKFLAGS_cstlib']=['-Bstatic']
+	v['cstlib_PATTERN']='lib%s.a'
+def configure(conf):
+	conf.find_scc()
+	conf.find_ar()
+	conf.scc_common_flags()
+	conf.cc_load_tools()
+	conf.cc_add_flags()
+	conf.link_add_flags()
+
+conf(find_scc)
+conf(scc_common_flags)
\ No newline at end of file
diff --git a/waflib/Tools/suncxx.py b/waflib/Tools/suncxx.py
new file mode 100644
index 0000000..c604cd2
--- /dev/null
+++ b/waflib/Tools/suncxx.py
@@ -0,0 +1,55 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os
+from waflib import Utils
+from waflib.Tools import ccroot,ar
+from waflib.Configure import conf
+def find_sxx(conf):
+	v=conf.env
+	cc=None
+	if v['CXX']:cc=v['CXX']
+	elif'CXX'in conf.environ:cc=conf.environ['CXX']
+	if not cc:cc=conf.find_program('CC',var='CXX')
+	if not cc:cc=conf.find_program('c++',var='CXX')
+	if not cc:conf.fatal('Could not find a Sun C++ compiler')
+	cc=conf.cmd_to_list(cc)
+	try:
+		conf.cmd_and_log(cc+['-flags'])
+	except:
+		conf.fatal('%r is not a Sun compiler'%cc)
+	v['CXX']=cc
+	v['CXX_NAME']='sun'
+def sxx_common_flags(conf):
+	v=conf.env
+	v['CXX_SRC_F']=[]
+	v['CXX_TGT_F']=['-c','-o']
+	if not v['LINK_CXX']:v['LINK_CXX']=v['CXX']
+	v['CXXLNK_SRC_F']=[]
+	v['CXXLNK_TGT_F']=['-o']
+	v['CPPPATH_ST']='-I%s'
+	v['DEFINES_ST']='-D%s'
+	v['LIB_ST']='-l%s'
+	v['LIBPATH_ST']='-L%s'
+	v['STLIB_ST']='-l%s'
+	v['STLIBPATH_ST']='-L%s'
+	v['SONAME_ST']='-Wl,-h,%s'
+	v['SHLIB_MARKER']='-Bdynamic'
+	v['STLIB_MARKER']='-Bstatic'
+	v['cxxprogram_PATTERN']='%s'
+	v['CXXFLAGS_cxxshlib']=['-Kpic','-DPIC']
+	v['LINKFLAGS_cxxshlib']=['-G']
+	v['cxxshlib_PATTERN']='lib%s.so'
+	v['LINKFLAGS_cxxstlib']=['-Bstatic']
+	v['cxxstlib_PATTERN']='lib%s.a'
+def configure(conf):
+	conf.find_sxx()
+	conf.find_ar()
+	conf.sxx_common_flags()
+	conf.cxx_load_tools()
+	conf.cxx_add_flags()
+	conf.link_add_flags()
+
+conf(find_sxx)
+conf(sxx_common_flags)
\ No newline at end of file
diff --git a/waflib/Tools/tex.py b/waflib/Tools/tex.py
new file mode 100644
index 0000000..4a26c43
--- /dev/null
+++ b/waflib/Tools/tex.py
@@ -0,0 +1,242 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os,re
+from waflib import Utils,Task,Errors
+from waflib.TaskGen import feature,before_method
+from waflib.Logs import error,warn,debug
+re_bibunit=re.compile(r'\\(?P<type>putbib)\[(?P<file>[^\[\]]*)\]',re.M)
+def bibunitscan(self):
+	node=self.inputs[0]
+	nodes=[]
+	if not node:return nodes
+	code=Utils.readf(node.abspath())
+	for match in re_bibunit.finditer(code):
+		path=match.group('file')
+		if path:
+			for k in['','.bib']:
+				debug('tex: trying %s%s'%(path,k))
+				fi=node.parent.find_resource(path+k)
+				if fi:
+					nodes.append(fi)
+			else:
+				debug('tex: could not find %s'%path)
+	debug("tex: found the following bibunit files: %s"%nodes)
+	return nodes
+exts_deps_tex=['','.ltx','.tex','.bib','.pdf','.png','.eps','.ps']
+exts_tex=['.ltx','.tex']
+re_tex=re.compile(r'\\(?P<type>include|bibliography|putbib|includegraphics|input|import|bringin|lstinputlisting)(\[[^\[\]]*\])?{(?P<file>[^{}]*)}',re.M)
+g_bibtex_re=re.compile('bibdata',re.M)
+class tex(Task.Task):
+	bibtex_fun,_=Task.compile_fun('${BIBTEX} ${BIBTEXFLAGS} ${SRCFILE}',shell=False)
+	bibtex_fun.__doc__="""
+	Execute the program **bibtex**
+	"""
+	makeindex_fun,_=Task.compile_fun('${MAKEINDEX} ${MAKEINDEXFLAGS} ${SRCFILE}',shell=False)
+	makeindex_fun.__doc__="""
+	Execute the program **makeindex**
+	"""
+	def scan_aux(self,node):
+		nodes=[node]
+		re_aux=re.compile(r'\\@input{(?P<file>[^{}]*)}',re.M)
+		def parse_node(node):
+			code=node.read()
+			for match in re_aux.finditer(code):
+				path=match.group('file')
+				found=node.parent.find_or_declare(path)
+				if found and found not in nodes:
+					debug('tex: found aux node '+found.abspath())
+					nodes.append(found)
+					parse_node(found)
+		parse_node(node)
+		return nodes
+	def scan(self):
+		node=self.inputs[0]
+		nodes=[]
+		names=[]
+		seen=[]
+		if not node:return(nodes,names)
+		def parse_node(node):
+			if node in seen:
+				return
+			seen.append(node)
+			code=node.read()
+			global re_tex
+			for match in re_tex.finditer(code):
+				for path in match.group('file').split(','):
+					if path:
+						add_name=True
+						found=None
+						for k in exts_deps_tex:
+							debug('tex: trying %s%s'%(path,k))
+							found=node.parent.find_resource(path+k)
+							if found and not found in self.outputs:
+								nodes.append(found)
+								add_name=False
+								for ext in exts_tex:
+									if found.name.endswith(ext):
+										parse_node(found)
+										break
+						if add_name:
+							names.append(path)
+		parse_node(node)
+		for x in nodes:
+			x.parent.get_bld().mkdir()
+		debug("tex: found the following : %s and names %s"%(nodes,names))
+		return(nodes,names)
+	def check_status(self,msg,retcode):
+		if retcode!=0:
+			raise Errors.WafError("%r command exit status %r"%(msg,retcode))
+	def bibfile(self):
+		need_bibtex=False
+		try:
+			for aux_node in self.aux_nodes:
+				ct=aux_node.read()
+				if g_bibtex_re.findall(ct):
+					need_bibtex=True
+					break
+		except(OSError,IOError):
+			error('error bibtex scan')
+		else:
+			if need_bibtex:
+				warn('calling bibtex')
+				self.env.env={}
+				self.env.env.update(os.environ)
+				self.env.env.update({'BIBINPUTS':self.TEXINPUTS,'BSTINPUTS':self.TEXINPUTS})
+				self.env.SRCFILE=self.aux_nodes[0].name[:-4]
+				self.check_status('error when calling bibtex',self.bibtex_fun())
+	def bibunits(self):
+		try:
+			bibunits=bibunitscan(self)
+		except FSError:
+			error('error bibunitscan')
+		else:
+			if bibunits:
+				fn=['bu'+str(i)for i in xrange(1,len(bibunits)+1)]
+				if fn:
+					warn('calling bibtex on bibunits')
+				for f in fn:
+					self.env.env={'BIBINPUTS':self.TEXINPUTS,'BSTINPUTS':self.TEXINPUTS}
+					self.env.SRCFILE=f
+					self.check_status('error when calling bibtex',self.bibtex_fun())
+	def makeindex(self):
+		try:
+			idx_path=self.idx_node.abspath()
+			os.stat(idx_path)
+		except OSError:
+			warn('index file %s absent, not calling makeindex'%idx_path)
+		else:
+			warn('calling makeindex')
+			self.env.SRCFILE=self.idx_node.name
+			self.env.env={}
+			self.check_status('error when calling makeindex %s'%idx_path,self.makeindex_fun())
+	def run(self):
+		env=self.env
+		if not env['PROMPT_LATEX']:
+			env.append_value('LATEXFLAGS','-interaction=batchmode')
+			env.append_value('PDFLATEXFLAGS','-interaction=batchmode')
+			env.append_value('XELATEXFLAGS','-interaction=batchmode')
+		fun=self.texfun
+		node=self.inputs[0]
+		srcfile=node.abspath()
+		texinputs=self.env.TEXINPUTS or''
+		self.TEXINPUTS=node.parent.get_bld().abspath()+os.pathsep+node.parent.get_src().abspath()+os.pathsep+texinputs+os.pathsep
+		self.aux_node=node.change_ext('.aux')
+		self.cwd=self.inputs[0].parent.get_bld().abspath()
+		warn('first pass on %s'%self.__class__.__name__)
+		self.env.env={}
+		self.env.env.update(os.environ)
+		self.env.env.update({'TEXINPUTS':self.TEXINPUTS})
+		self.env.SRCFILE=srcfile
+		self.check_status('error when calling latex',fun())
+		self.aux_nodes=self.scan_aux(node.change_ext('.aux'))
+		self.idx_node=node.change_ext('.idx')
+		self.bibfile()
+		self.bibunits()
+		self.makeindex()
+		hash=''
+		for i in range(10):
+			prev_hash=hash
+			try:
+				hashes=[Utils.h_file(x.abspath())for x in self.aux_nodes]
+				hash=Utils.h_list(hashes)
+			except(OSError,IOError):
+				error('could not read aux.h')
+				pass
+			if hash and hash==prev_hash:
+				break
+			warn('calling %s'%self.__class__.__name__)
+			self.env.env={}
+			self.env.env.update(os.environ)
+			self.env.env.update({'TEXINPUTS':self.TEXINPUTS})
+			self.env.SRCFILE=srcfile
+			self.check_status('error when calling %s'%self.__class__.__name__,fun())
+class latex(tex):
+	texfun,vars=Task.compile_fun('${LATEX} ${LATEXFLAGS} ${SRCFILE}',shell=False)
+class pdflatex(tex):
+	texfun,vars=Task.compile_fun('${PDFLATEX} ${PDFLATEXFLAGS} ${SRCFILE}',shell=False)
+class xelatex(tex):
+	texfun,vars=Task.compile_fun('${XELATEX} ${XELATEXFLAGS} ${SRCFILE}',shell=False)
+class dvips(Task.Task):
+	run_str='${DVIPS} ${DVIPSFLAGS} ${SRC} -o ${TGT}'
+	color='BLUE'
+	after=['latex','pdflatex','xelatex']
+class dvipdf(Task.Task):
+	run_str='${DVIPDF} ${DVIPDFFLAGS} ${SRC} ${TGT}'
+	color='BLUE'
+	after=['latex','pdflatex','xelatex']
+class pdf2ps(Task.Task):
+	run_str='${PDF2PS} ${PDF2PSFLAGS} ${SRC} ${TGT}'
+	color='BLUE'
+	after=['latex','pdflatex','xelatex']
+def apply_tex(self):
+	if not getattr(self,'type',None)in['latex','pdflatex','xelatex']:
+		self.type='pdflatex'
+	tree=self.bld
+	outs=Utils.to_list(getattr(self,'outs',[]))
+	self.env['PROMPT_LATEX']=getattr(self,'prompt',1)
+	deps_lst=[]
+	if getattr(self,'deps',None):
+		deps=self.to_list(self.deps)
+		for filename in deps:
+			n=self.path.find_resource(filename)
+			if not n in deps_lst:deps_lst.append(n)
+	for node in self.to_nodes(self.source):
+		if self.type=='latex':
+			task=self.create_task('latex',node,node.change_ext('.dvi'))
+		elif self.type=='pdflatex':
+			task=self.create_task('pdflatex',node,node.change_ext('.pdf'))
+		elif self.type=='xelatex':
+			task=self.create_task('xelatex',node,node.change_ext('.pdf'))
+		task.env=self.env
+		if deps_lst:
+			try:
+				lst=tree.node_deps[task.uid()]
+				for n in deps_lst:
+					if not n in lst:
+						lst.append(n)
+			except KeyError:
+				tree.node_deps[task.uid()]=deps_lst
+		if self.type=='latex':
+			if'ps'in outs:
+				tsk=self.create_task('dvips',task.outputs,node.change_ext('.ps'))
+				tsk.env.env={'TEXINPUTS':node.parent.abspath()+os.pathsep+self.path.abspath()+os.pathsep+self.path.get_bld().abspath()}
+			if'pdf'in outs:
+				tsk=self.create_task('dvipdf',task.outputs,node.change_ext('.pdf'))
+				tsk.env.env={'TEXINPUTS':node.parent.abspath()+os.pathsep+self.path.abspath()+os.pathsep+self.path.get_bld().abspath()}
+		elif self.type=='pdflatex':
+			if'ps'in outs:
+				self.create_task('pdf2ps',task.outputs,node.change_ext('.ps'))
+	self.source=[]
+def configure(self):
+	v=self.env
+	for p in'tex latex pdflatex xelatex bibtex dvips dvipdf ps2pdf makeindex pdf2ps'.split():
+		try:
+			self.find_program(p,var=p.upper())
+		except self.errors.ConfigurationError:
+			pass
+	v['DVIPSFLAGS']='-Ppdf'
+
+feature('tex')(apply_tex)
+before_method('process_source')(apply_tex)
\ No newline at end of file
diff --git a/waflib/Tools/vala.py b/waflib/Tools/vala.py
new file mode 100644
index 0000000..ff422ef
--- /dev/null
+++ b/waflib/Tools/vala.py
@@ -0,0 +1,216 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os.path,shutil,re
+from waflib import Context,Task,Utils,Logs,Options,Errors
+from waflib.TaskGen import extension
+from waflib.Configure import conf
+class valac(Task.Task):
+	vars=["VALAC","VALAC_VERSION","VALAFLAGS"]
+	ext_out=['.h']
+	def run(self):
+		env=self.env
+		cmd=[env['VALAC'],'-C','--quiet']
+		cmd.extend(Utils.to_list(env['VALAFLAGS']))
+		if self.threading:
+			cmd.append('--thread')
+		if self.profile:
+			cmd.append('--profile=%s'%self.profile)
+		if self.target_glib:
+			cmd.append('--target-glib=%s'%self.target_glib)
+		if self.is_lib:
+			cmd.append('--library='+self.target)
+			for x in self.outputs:
+				if x.name.endswith('.h'):
+					cmd.append('--header='+x.name)
+			if self.gir:
+				cmd.append('--gir=%s.gir'%self.gir)
+		for vapi_dir in self.vapi_dirs:
+			cmd.append('--vapidir=%s'%vapi_dir)
+		for package in self.packages:
+			cmd.append('--pkg=%s'%package)
+		for package in self.packages_private:
+			cmd.append('--pkg=%s'%package)
+		for define in self.vala_defines:
+			cmd.append('--define=%s'%define)
+		cmd.extend([a.abspath()for a in self.inputs])
+		ret=self.exec_command(cmd,cwd=self.outputs[0].parent.abspath())
+		if ret:
+			return ret
+		for x in self.outputs:
+			if id(x.parent)!=id(self.outputs[0].parent):
+				shutil.move(self.outputs[0].parent.abspath()+os.sep+x.name,x.abspath())
+		if self.packages and getattr(self,'deps_node',None):
+			self.deps_node.write('\n'.join(self.packages))
+		return ret
+def vala_file(self,node):
+	valatask=getattr(self,"valatask",None)
+	if not valatask:
+		def _get_api_version():
+			api_version='1.0'
+			if hasattr(Context.g_module,'API_VERSION'):
+				version=Context.g_module.API_VERSION.split(".")
+				if version[0]=="0":
+					api_version="0."+version[1]
+				else:
+					api_version=version[0]+".0"
+			return api_version
+		valatask=self.create_task('valac')
+		self.valatask=valatask
+		self.includes=Utils.to_list(getattr(self,'includes',[]))
+		self.uselib=self.to_list(getattr(self,'uselib',[]))
+		valatask.packages=[]
+		valatask.packages_private=Utils.to_list(getattr(self,'packages_private',[]))
+		valatask.vapi_dirs=[]
+		valatask.target=self.target
+		valatask.threading=False
+		valatask.install_path=getattr(self,'install_path','')
+		valatask.profile=getattr(self,'profile','gobject')
+		valatask.vala_defines=getattr(self,'vala_defines',[])
+		valatask.target_glib=None
+		valatask.gir=getattr(self,'gir',None)
+		valatask.gir_path=getattr(self,'gir_path','${DATAROOTDIR}/gir-1.0')
+		valatask.vapi_path=getattr(self,'vapi_path','${DATAROOTDIR}/vala/vapi')
+		valatask.pkg_name=getattr(self,'pkg_name',self.env['PACKAGE'])
+		valatask.header_path=getattr(self,'header_path','${INCLUDEDIR}/%s-%s'%(valatask.pkg_name,_get_api_version()))
+		valatask.install_binding=getattr(self,'install_binding',True)
+		valatask.is_lib=False
+		if not'cprogram'in self.features:
+			valatask.is_lib=True
+		packages=Utils.to_list(getattr(self,'packages',[]))
+		vapi_dirs=Utils.to_list(getattr(self,'vapi_dirs',[]))
+		includes=[]
+		if hasattr(self,'use'):
+			local_packages=Utils.to_list(self.use)[:]
+			seen=[]
+			while len(local_packages)>0:
+				package=local_packages.pop()
+				if package in seen:
+					continue
+				seen.append(package)
+				try:
+					package_obj=self.bld.get_tgen_by_name(package)
+				except Errors.WafError:
+					continue
+				package_name=package_obj.target
+				package_node=package_obj.path
+				package_dir=package_node.path_from(self.path)
+				for task in package_obj.tasks:
+					for output in task.outputs:
+						if output.name==package_name+".vapi":
+							valatask.set_run_after(task)
+							if package_name not in packages:
+								packages.append(package_name)
+							if package_dir not in vapi_dirs:
+								vapi_dirs.append(package_dir)
+							if package_dir not in includes:
+								includes.append(package_dir)
+				if hasattr(package_obj,'use'):
+					lst=self.to_list(package_obj.use)
+					lst.reverse()
+					local_packages=[pkg for pkg in lst if pkg not in seen]+local_packages
+		valatask.packages=packages
+		for vapi_dir in vapi_dirs:
+			try:
+				valatask.vapi_dirs.append(self.path.find_dir(vapi_dir).abspath())
+				valatask.vapi_dirs.append(self.path.find_dir(vapi_dir).get_bld().abspath())
+			except AttributeError:
+				Logs.warn("Unable to locate Vala API directory: '%s'"%vapi_dir)
+		self.includes.append(self.bld.srcnode.abspath())
+		self.includes.append(self.bld.bldnode.abspath())
+		for include in includes:
+			try:
+				self.includes.append(self.path.find_dir(include).abspath())
+				self.includes.append(self.path.find_dir(include).get_bld().abspath())
+			except AttributeError:
+				Logs.warn("Unable to locate include directory: '%s'"%include)
+		if valatask.profile=='gobject':
+			if hasattr(self,'target_glib'):
+				Logs.warn('target_glib on vala tasks is not supported --vala-target-glib=MAJOR.MINOR from the vala tool options')
+			if getattr(Options.options,'vala_target_glib',None):
+				valatask.target_glib=Options.options.vala_target_glib
+			if not'GOBJECT'in self.uselib:
+				self.uselib.append('GOBJECT')
+		if hasattr(self,'threading'):
+			if valatask.profile=='gobject':
+				valatask.threading=self.threading
+				if not'GTHREAD'in self.uselib:
+					self.uselib.append('GTHREAD')
+			else:
+				Logs.warn("Profile %s does not have threading support"%valatask.profile)
+		if valatask.is_lib:
+			valatask.outputs.append(self.path.find_or_declare('%s.h'%self.target))
+			valatask.outputs.append(self.path.find_or_declare('%s.vapi'%self.target))
+			if valatask.gir:
+				valatask.outputs.append(self.path.find_or_declare('%s.gir'%self.gir))
+			if valatask.packages:
+				d=self.path.find_or_declare('%s.deps'%self.target)
+				valatask.outputs.append(d)
+				valatask.deps_node=d
+	valatask.inputs.append(node)
+	c_node=node.change_ext('.c')
+	valatask.outputs.append(c_node)
+	self.source.append(c_node)
+	if valatask.is_lib and valatask.install_binding:
+		headers_list=[o for o in valatask.outputs if o.suffix()==".h"]
+		try:
+			self.install_vheader.source=headers_list
+		except AttributeError:
+			self.install_vheader=self.bld.install_files(valatask.header_path,headers_list,self.env)
+		vapi_list=[o for o in valatask.outputs if(o.suffix()in(".vapi",".deps"))]
+		try:
+			self.install_vapi.source=vapi_list
+		except AttributeError:
+			self.install_vapi=self.bld.install_files(valatask.vapi_path,vapi_list,self.env)
+		gir_list=[o for o in valatask.outputs if o.suffix()==".gir"]
+		try:
+			self.install_gir.source=gir_list
+		except AttributeError:
+			self.install_gir=self.bld.install_files(valatask.gir_path,gir_list,self.env)
+valac=Task.update_outputs(valac)
+def find_valac(self,valac_name,min_version):
+	valac=self.find_program(valac_name,var='VALAC')
+	try:
+		output=self.cmd_and_log(valac+' --version')
+	except Exception:
+		valac_version=None
+	else:
+		ver=re.search(r'\d+.\d+.\d+',output).group(0).split('.')
+		valac_version=tuple([int(x)for x in ver])
+	self.msg('Checking for %s version >= %r'%(valac_name,min_version),valac_version,valac_version and valac_version>=min_version)
+	if valac and valac_version<min_version:
+		self.fatal("%s version %r is too old, need >= %r"%(valac_name,valac_version,min_version))
+	self.env['VALAC_VERSION']=valac_version
+	return valac
+def check_vala(self,min_version=(0,8,0),branch=None):
+	if not branch:
+		branch=min_version[:2]
+	try:
+		find_valac(self,'valac-%d.%d'%(branch[0],branch[1]),min_version)
+	except self.errors.ConfigurationError:
+		find_valac(self,'valac',min_version)
+def check_vala_deps(self):
+	if not self.env['HAVE_GOBJECT']:
+		pkg_args={'package':'gobject-2.0','uselib_store':'GOBJECT','args':'--cflags --libs'}
+		if getattr(Options.options,'vala_target_glib',None):
+			pkg_args['atleast_version']=Options.options.vala_target_glib
+		self.check_cfg(**pkg_args)
+	if not self.env['HAVE_GTHREAD']:
+		pkg_args={'package':'gthread-2.0','uselib_store':'GTHREAD','args':'--cflags --libs'}
+		if getattr(Options.options,'vala_target_glib',None):
+			pkg_args['atleast_version']=Options.options.vala_target_glib
+		self.check_cfg(**pkg_args)
+def configure(self):
+	self.load('gnu_dirs')
+	self.check_vala_deps()
+	self.check_vala()
+def options(opt):
+	opt.load('gnu_dirs')
+	valaopts=opt.add_option_group('Vala Compiler Options')
+	valaopts.add_option('--vala-target-glib',default=None,dest='vala_target_glib',metavar='MAJOR.MINOR',help='Target version of glib for Vala GObject code generation')
+
+extension('.vala','.gs')(vala_file)
+conf(find_valac)
+conf(check_vala)
+conf(check_vala_deps)
\ No newline at end of file
diff --git a/waflib/Tools/waf_unit_test.py b/waflib/Tools/waf_unit_test.py
new file mode 100644
index 0000000..850e713
--- /dev/null
+++ b/waflib/Tools/waf_unit_test.py
@@ -0,0 +1,79 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os,sys
+from waflib.TaskGen import feature,after_method
+from waflib import Utils,Task,Logs,Options
+testlock=Utils.threading.Lock()
+def make_test(self):
+	if getattr(self,'link_task',None):
+		self.create_task('utest',self.link_task.outputs)
+class utest(Task.Task):
+	color='PINK'
+	after=['vnum','inst']
+	vars=[]
+	def runnable_status(self):
+		ret=super(utest,self).runnable_status()
+		if ret==Task.SKIP_ME:
+			if getattr(Options.options,'all_tests',False):
+				return Task.RUN_ME
+		return ret
+	def run(self):
+		filename=self.inputs[0].abspath()
+		self.ut_exec=getattr(self,'ut_exec',[filename])
+		if getattr(self.generator,'ut_fun',None):
+			self.generator.ut_fun(self)
+		try:
+			fu=getattr(self.generator.bld,'all_test_paths')
+		except AttributeError:
+			fu=os.environ.copy()
+			self.generator.bld.all_test_paths=fu
+			lst=[]
+			for g in self.generator.bld.groups:
+				for tg in g:
+					if getattr(tg,'link_task',None):
+						lst.append(tg.link_task.outputs[0].parent.abspath())
+			def add_path(dct,path,var):
+				dct[var]=os.pathsep.join(Utils.to_list(path)+[os.environ.get(var,'')])
+			if Utils.is_win32:
+				add_path(fu,lst,'PATH')
+			elif Utils.unversioned_sys_platform()=='darwin':
+				add_path(fu,lst,'DYLD_LIBRARY_PATH')
+				add_path(fu,lst,'LD_LIBRARY_PATH')
+			else:
+				add_path(fu,lst,'LD_LIBRARY_PATH')
+		cwd=getattr(self.generator,'ut_cwd','')or self.inputs[0].parent.abspath()
+		proc=Utils.subprocess.Popen(self.ut_exec,cwd=cwd,env=fu,stderr=Utils.subprocess.PIPE,stdout=Utils.subprocess.PIPE)
+		(stdout,stderr)=proc.communicate()
+		tup=(filename,proc.returncode,stdout,stderr)
+		self.generator.utest_result=tup
+		testlock.acquire()
+		try:
+			bld=self.generator.bld
+			Logs.debug("ut: %r",tup)
+			try:
+				bld.utest_results.append(tup)
+			except AttributeError:
+				bld.utest_results=[tup]
+		finally:
+			testlock.release()
+def summary(bld):
+	lst=getattr(bld,'utest_results',[])
+	if lst:
+		Logs.pprint('CYAN','execution summary')
+		total=len(lst)
+		tfail=len([x for x in lst if x[1]])
+		Logs.pprint('CYAN','  tests that pass %d/%d'%(total-tfail,total))
+		for(f,code,out,err)in lst:
+			if not code:
+				Logs.pprint('CYAN','    %s'%f)
+		Logs.pprint('CYAN','  tests that fail %d/%d'%(tfail,total))
+		for(f,code,out,err)in lst:
+			if code:
+				Logs.pprint('CYAN','    %s'%f)
+def options(opt):
+	opt.add_option('--alltests',action='store_true',default=False,help='Exec all unit tests',dest='all_tests')
+
+feature('test')(make_test)
+after_method('apply_link')(make_test)
\ No newline at end of file
diff --git a/waflib/Tools/winres.py b/waflib/Tools/winres.py
new file mode 100644
index 0000000..93dd4f2
--- /dev/null
+++ b/waflib/Tools/winres.py
@@ -0,0 +1,34 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+from waflib import Task
+from waflib.TaskGen import extension
+def rc_file(self,node):
+	obj_ext='.rc.o'
+	if self.env['WINRC_TGT_F']=='/fo':
+		obj_ext='.res'
+	rctask=self.create_task('winrc',node,node.change_ext(obj_ext))
+	try:
+		self.compiled_tasks.append(rctask)
+	except AttributeError:
+		self.compiled_tasks=[rctask]
+class winrc(Task.Task):
+	run_str='${WINRC} ${WINRCFLAGS} ${CPPPATH_ST:INCPATHS} ${DEFINES_ST:DEFINES} ${WINRC_TGT_F} ${TGT} ${WINRC_SRC_F} ${SRC}'
+	color='BLUE'
+def configure(conf):
+	v=conf.env
+	v['WINRC_TGT_F']='-o'
+	v['WINRC_SRC_F']='-i'
+	if not conf.env.WINRC:
+		if v.CC_NAME=='msvc':
+			conf.find_program('RC',var='WINRC',path_list=v['PATH'])
+			v['WINRC_TGT_F']='/fo'
+			v['WINRC_SRC_F']=''
+		else:
+			conf.find_program('windres',var='WINRC',path_list=v['PATH'])
+	if not conf.env.WINRC:
+		conf.fatal('winrc was not found!')
+	v['WINRCFLAGS']=[]
+
+extension('.rc')(rc_file)
\ No newline at end of file
diff --git a/waflib/Tools/xlc.py b/waflib/Tools/xlc.py
new file mode 100644
index 0000000..c2a9982
--- /dev/null
+++ b/waflib/Tools/xlc.py
@@ -0,0 +1,46 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+from waflib.Tools import ccroot,ar
+from waflib.Configure import conf
+def find_xlc(conf):
+	cc=conf.find_program(['xlc_r','xlc'],var='CC')
+	cc=conf.cmd_to_list(cc)
+	conf.get_xlc_version(cc)
+	conf.env.CC_NAME='xlc'
+	conf.env.CC=cc
+def xlc_common_flags(conf):
+	v=conf.env
+	v['CC_SRC_F']=[]
+	v['CC_TGT_F']=['-c','-o']
+	if not v['LINK_CC']:v['LINK_CC']=v['CC']
+	v['CCLNK_SRC_F']=[]
+	v['CCLNK_TGT_F']=['-o']
+	v['CPPPATH_ST']='-I%s'
+	v['DEFINES_ST']='-D%s'
+	v['LIB_ST']='-l%s'
+	v['LIBPATH_ST']='-L%s'
+	v['STLIB_ST']='-l%s'
+	v['STLIBPATH_ST']='-L%s'
+	v['RPATH_ST']='-Wl,-rpath,%s'
+	v['SONAME_ST']=[]
+	v['SHLIB_MARKER']=[]
+	v['STLIB_MARKER']=[]
+	v['LINKFLAGS_cprogram']=['-Wl,-brtl']
+	v['cprogram_PATTERN']='%s'
+	v['CFLAGS_cshlib']=['-fPIC']
+	v['LINKFLAGS_cshlib']=['-G','-Wl,-brtl,-bexpfull']
+	v['cshlib_PATTERN']='lib%s.so'
+	v['LINKFLAGS_cstlib']=[]
+	v['cstlib_PATTERN']='lib%s.a'
+def configure(conf):
+	conf.find_xlc()
+	conf.find_ar()
+	conf.xlc_common_flags()
+	conf.cc_load_tools()
+	conf.cc_add_flags()
+	conf.link_add_flags()
+
+conf(find_xlc)
+conf(xlc_common_flags)
\ No newline at end of file
diff --git a/waflib/Tools/xlcxx.py b/waflib/Tools/xlcxx.py
new file mode 100644
index 0000000..bfbe01e
--- /dev/null
+++ b/waflib/Tools/xlcxx.py
@@ -0,0 +1,46 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+from waflib.Tools import ccroot,ar
+from waflib.Configure import conf
+def find_xlcxx(conf):
+	cxx=conf.find_program(['xlc++_r','xlc++'],var='CXX')
+	cxx=conf.cmd_to_list(cxx)
+	conf.get_xlc_version(cxx)
+	conf.env.CXX_NAME='xlc++'
+	conf.env.CXX=cxx
+def xlcxx_common_flags(conf):
+	v=conf.env
+	v['CXX_SRC_F']=[]
+	v['CXX_TGT_F']=['-c','-o']
+	if not v['LINK_CXX']:v['LINK_CXX']=v['CXX']
+	v['CXXLNK_SRC_F']=[]
+	v['CXXLNK_TGT_F']=['-o']
+	v['CPPPATH_ST']='-I%s'
+	v['DEFINES_ST']='-D%s'
+	v['LIB_ST']='-l%s'
+	v['LIBPATH_ST']='-L%s'
+	v['STLIB_ST']='-l%s'
+	v['STLIBPATH_ST']='-L%s'
+	v['RPATH_ST']='-Wl,-rpath,%s'
+	v['SONAME_ST']=[]
+	v['SHLIB_MARKER']=[]
+	v['STLIB_MARKER']=[]
+	v['LINKFLAGS_cxxprogram']=['-Wl,-brtl']
+	v['cxxprogram_PATTERN']='%s'
+	v['CXXFLAGS_cxxshlib']=['-fPIC']
+	v['LINKFLAGS_cxxshlib']=['-G','-Wl,-brtl,-bexpfull']
+	v['cxxshlib_PATTERN']='lib%s.so'
+	v['LINKFLAGS_cxxstlib']=[]
+	v['cxxstlib_PATTERN']='lib%s.a'
+def configure(conf):
+	conf.find_xlcxx()
+	conf.find_ar()
+	conf.xlcxx_common_flags()
+	conf.cxx_load_tools()
+	conf.cxx_add_flags()
+	conf.link_add_flags()
+
+conf(find_xlcxx)
+conf(xlcxx_common_flags)
\ No newline at end of file
diff --git a/waflib/Utils.py b/waflib/Utils.py
new file mode 100644
index 0000000..25fa3f0
--- /dev/null
+++ b/waflib/Utils.py
@@ -0,0 +1,336 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os,sys,errno,traceback,inspect,re,shutil,datetime,gc
+try:
+	import subprocess
+except:
+	try:
+		import waflib.extras.subprocess as subprocess
+	except:
+		print("The subprocess module is missing (python2.3?):\n try calling 'waf update --files=subprocess'\n or add a copy of subprocess.py to the python libraries")
+try:
+	from collections import deque
+except ImportError:
+	class deque(list):
+		def popleft(self):
+			return self.pop(0)
+try:
+	import _winreg as winreg
+except:
+	try:
+		import winreg
+	except:
+		winreg=None
+from waflib import Errors
+try:
+	from collections import UserDict
+except:
+	from UserDict import UserDict
+try:
+	from hashlib import md5
+except:
+	try:
+		from md5 import md5
+	except:
+		pass
+try:
+	import threading
+except:
+	class threading(object):
+		pass
+	class Lock(object):
+		def acquire(self):
+			pass
+		def release(self):
+			pass
+	threading.Lock=threading.Thread=Lock
+else:
+	run_old=threading.Thread.run
+	def run(*args,**kwargs):
+		try:
+			run_old(*args,**kwargs)
+		except(KeyboardInterrupt,SystemExit):
+			raise
+		except:
+			sys.excepthook(*sys.exc_info())
+	threading.Thread.run=run
+SIG_NIL='iluvcuteoverload'
+O644=420
+O755=493
+rot_chr=['\\','|','/','-']
+rot_idx=0
+try:
+	from collections import defaultdict
+except ImportError:
+	class defaultdict(dict):
+		def __init__(self,default_factory):
+			super(defaultdict,self).__init__()
+			self.default_factory=default_factory
+		def __getitem__(self,key):
+			try:
+				return super(defaultdict,self).__getitem__(key)
+			except KeyError:
+				value=self.default_factory()
+				self[key]=value
+				return value
+is_win32=sys.platform in('win32','cli')
+indicator='\x1b[K%s%s%s\r'
+if is_win32 and'NOCOLOR'in os.environ:
+	indicator='%s%s%s\r'
+def readf(fname,m='r'):
+	f=open(fname,m)
+	try:
+		txt=f.read()
+	finally:
+		f.close()
+	return txt
+def h_file(filename):
+	f=open(filename,'rb')
+	m=md5()
+	try:
+		while filename:
+			filename=f.read(100000)
+			m.update(filename)
+	finally:
+		f.close()
+	return m.digest()
+try:
+	x=''.encode('hex')
+except:
+	import binascii
+	def to_hex(s):
+		ret=binascii.hexlify(s)
+		if not isinstance(ret,str):
+			ret=ret.decode('utf-8')
+		return ret
+else:
+	def to_hex(s):
+		return s.encode('hex')
+to_hex.__doc__="""
+Return the hexadecimal representation of a string
+
+:param s: string to convert
+:type s: string
+"""
+listdir=os.listdir
+if is_win32:
+	def listdir_win32(s):
+		if not s:
+			try:
+				import ctypes
+			except:
+				return[x+':\\'for x in list('ABCDEFGHIJKLMNOPQRSTUVWXYZ')]
+			else:
+				dlen=4
+				maxdrives=26
+				buf=ctypes.create_string_buffer(maxdrives*dlen)
+				ndrives=ctypes.windll.kernel32.GetLogicalDriveStringsA(maxdrives,ctypes.byref(buf))
+				return[buf.raw[4*i:4*i+3].decode('ascii')for i in range(int(ndrives/dlen))]
+		if len(s)==2 and s[1]==":":
+			s+=os.sep
+		if not os.path.isdir(s):
+			e=OSError()
+			e.errno=errno.ENOENT
+			raise e
+		return os.listdir(s)
+	listdir=listdir_win32
+def num2ver(ver):
+	if isinstance(ver,str):
+		ver=tuple(ver.split('.'))
+	if isinstance(ver,tuple):
+		ret=0
+		for i in range(4):
+			if i<len(ver):
+				ret+=256**(3-i)*int(ver[i])
+		return ret
+	return ver
+def ex_stack():
+	exc_type,exc_value,tb=sys.exc_info()
+	exc_lines=traceback.format_exception(exc_type,exc_value,tb)
+	return''.join(exc_lines)
+def to_list(sth):
+	if isinstance(sth,str):
+		return sth.split()
+	else:
+		return sth
+re_nl=re.compile('\r*\n',re.M)
+def str_to_dict(txt):
+	tbl={}
+	lines=re_nl.split(txt)
+	for x in lines:
+		x=x.strip()
+		if not x or x.startswith('#')or x.find('=')<0:
+			continue
+		tmp=x.split('=')
+		tbl[tmp[0].strip()]='='.join(tmp[1:]).strip()
+	return tbl
+def split_path(path):
+	return path.split('/')
+def split_path_cygwin(path):
+	if path.startswith('//'):
+		ret=path.split('/')[2:]
+		ret[0]='/'+ret[0]
+		return ret
+	return path.split('/')
+re_sp=re.compile('[/\\\\]')
+def split_path_win32(path):
+	if path.startswith('\\\\'):
+		ret=re.split(re_sp,path)[2:]
+		ret[0]='\\'+ret[0]
+		return ret
+	return re.split(re_sp,path)
+if sys.platform=='cygwin':
+	split_path=split_path_cygwin
+elif is_win32:
+	split_path=split_path_win32
+split_path.__doc__="""
+Split a path by / or \\. This function is not like os.path.split
+
+:type  path: string
+:param path: path to split
+:return:     list of strings
+"""
+def check_dir(path):
+	if not os.path.isdir(path):
+		try:
+			os.makedirs(path)
+		except OSError ,e:
+			if not os.path.isdir(path):
+				raise Errors.WafError('Cannot create the folder %r'%path,ex=e)
+def def_attrs(cls,**kw):
+	for k,v in kw.items():
+		if not hasattr(cls,k):
+			setattr(cls,k,v)
+def quote_define_name(s):
+	fu=re.compile("[^a-zA-Z0-9]").sub("_",s)
+	fu=fu.upper()
+	return fu
+def h_list(lst):
+	m=md5()
+	m.update(str(lst))
+	return m.digest()
+def h_fun(fun):
+	try:
+		return fun.code
+	except AttributeError:
+		try:
+			h=inspect.getsource(fun)
+		except IOError:
+			h="nocode"
+		try:
+			fun.code=h
+		except AttributeError:
+			pass
+		return h
+reg_subst=re.compile(r"(\\\\)|(\$\$)|\$\{([^}]+)\}")
+def subst_vars(expr,params):
+	def repl_var(m):
+		if m.group(1):
+			return'\\'
+		if m.group(2):
+			return'$'
+		try:
+			return params.get_flat(m.group(3))
+		except AttributeError:
+			return params[m.group(3)]
+	return reg_subst.sub(repl_var,expr)
+def destos_to_binfmt(key):
+	if key=='darwin':
+		return'mac-o'
+	elif key in('win32','cygwin','uwin','msys'):
+		return'pe'
+	return'elf'
+def unversioned_sys_platform():
+	s=sys.platform
+	if s=='java':
+		from java.lang import System
+		s=System.getProperty('os.name')
+		if s=='Mac OS X':
+			return'darwin'
+		elif s.startswith('Windows '):
+			return'win32'
+		elif s=='OS/2':
+			return'os2'
+		elif s=='HP-UX':
+			return'hpux'
+		elif s in('SunOS','Solaris'):
+			return'sunos'
+		else:s=s.lower()
+	if s=='powerpc':
+		return'darwin'
+	if s=='win32'or s.endswith('os2')and s!='sunos2':return s
+	return re.split('\d+$',s)[0]
+def nada(*k,**kw):
+	pass
+class Timer(object):
+	def __init__(self):
+		self.start_time=datetime.datetime.utcnow()
+	def __str__(self):
+		delta=datetime.datetime.utcnow()-self.start_time
+		days=int(delta.days)
+		hours=delta.seconds//3600
+		minutes=(delta.seconds-hours*3600)//60
+		seconds=delta.seconds-hours*3600-minutes*60+float(delta.microseconds)/1000/1000
+		result=''
+		if days:
+			result+='%dd'%days
+		if days or hours:
+			result+='%dh'%hours
+		if days or hours or minutes:
+			result+='%dm'%minutes
+		return'%s%.3fs'%(result,seconds)
+if is_win32:
+	old=shutil.copy2
+	def copy2(src,dst):
+		old(src,dst)
+		shutil.copystat(src,dst)
+	setattr(shutil,'copy2',copy2)
+if os.name=='java':
+	try:
+		gc.disable()
+		gc.enable()
+	except NotImplementedError:
+		gc.disable=gc.enable
+def read_la_file(path):
+	sp=re.compile(r'^([^=]+)=\'(.*)\'$')
+	dc={}
+	for line in readf(path).splitlines():
+		try:
+			_,left,right,_=sp.split(line.strip())
+			dc[left]=right
+		except ValueError:
+			pass
+	return dc
+def nogc(fun):
+	def f(*k,**kw):
+		try:
+			gc.disable()
+			ret=fun(*k,**kw)
+		finally:
+			gc.enable()
+		return ret
+	f.__doc__=fun.__doc__
+	return f
+def run_once(fun):
+	cache={}
+	def wrap(k):
+		try:
+			return cache[k]
+		except KeyError:
+			ret=fun(k)
+			cache[k]=ret
+			return ret
+	wrap.__cache__=cache
+	return wrap
+def get_registry_app_path(key,filename):
+	if not winreg:
+		return None
+	try:
+		result=winreg.QueryValue(key,"Software\\Microsoft\\Windows\\CurrentVersion\\App Paths\\%s.exe"%filename[0])
+	except WindowsError:
+		pass
+	else:
+		if os.path.isfile(result):
+			return result
diff --git a/waflib/__init__.py b/waflib/__init__.py
new file mode 100644
index 0000000..efeed79
--- /dev/null
+++ b/waflib/__init__.py
@@ -0,0 +1,4 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
diff --git a/waflib/ansiterm.py b/waflib/ansiterm.py
new file mode 100644
index 0000000..485d033
--- /dev/null
+++ b/waflib/ansiterm.py
@@ -0,0 +1,177 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import sys,os
+try:
+	if not(sys.stderr.isatty()and sys.stdout.isatty()):
+		raise ValueError('not a tty')
+	from ctypes import*
+	class COORD(Structure):
+		_fields_=[("X",c_short),("Y",c_short)]
+	class SMALL_RECT(Structure):
+		_fields_=[("Left",c_short),("Top",c_short),("Right",c_short),("Bottom",c_short)]
+	class CONSOLE_SCREEN_BUFFER_INFO(Structure):
+		_fields_=[("Size",COORD),("CursorPosition",COORD),("Attributes",c_short),("Window",SMALL_RECT),("MaximumWindowSize",COORD)]
+	class CONSOLE_CURSOR_INFO(Structure):
+		_fields_=[('dwSize',c_ulong),('bVisible',c_int)]
+	sbinfo=CONSOLE_SCREEN_BUFFER_INFO()
+	csinfo=CONSOLE_CURSOR_INFO()
+	hconsole=windll.kernel32.GetStdHandle(-11)
+	windll.kernel32.GetConsoleScreenBufferInfo(hconsole,byref(sbinfo))
+	if sbinfo.Size.X<9 or sbinfo.Size.Y<9:raise ValueError('small console')
+	windll.kernel32.GetConsoleCursorInfo(hconsole,byref(csinfo))
+except Exception:
+	pass
+else:
+	import re,threading
+	is_vista=getattr(sys,"getwindowsversion",None)and sys.getwindowsversion()[0]>=6
+	try:
+		_type=unicode
+	except:
+		_type=str
+	to_int=lambda number,default:number and int(number)or default
+	wlock=threading.Lock()
+	STD_OUTPUT_HANDLE=-11
+	STD_ERROR_HANDLE=-12
+	class AnsiTerm(object):
+		def __init__(self):
+			self.encoding=sys.stdout.encoding
+			self.hconsole=windll.kernel32.GetStdHandle(STD_OUTPUT_HANDLE)
+			self.cursor_history=[]
+			self.orig_sbinfo=CONSOLE_SCREEN_BUFFER_INFO()
+			self.orig_csinfo=CONSOLE_CURSOR_INFO()
+			windll.kernel32.GetConsoleScreenBufferInfo(self.hconsole,byref(self.orig_sbinfo))
+			windll.kernel32.GetConsoleCursorInfo(hconsole,byref(self.orig_csinfo))
+		def screen_buffer_info(self):
+			sbinfo=CONSOLE_SCREEN_BUFFER_INFO()
+			windll.kernel32.GetConsoleScreenBufferInfo(self.hconsole,byref(sbinfo))
+			return sbinfo
+		def clear_line(self,param):
+			mode=param and int(param)or 0
+			sbinfo=self.screen_buffer_info()
+			if mode==1:
+				line_start=COORD(0,sbinfo.CursorPosition.Y)
+				line_length=sbinfo.Size.X
+			elif mode==2:
+				line_start=COORD(sbinfo.CursorPosition.X,sbinfo.CursorPosition.Y)
+				line_length=sbinfo.Size.X-sbinfo.CursorPosition.X
+			else:
+				line_start=sbinfo.CursorPosition
+				line_length=sbinfo.Size.X-sbinfo.CursorPosition.X
+			chars_written=c_int()
+			windll.kernel32.FillConsoleOutputCharacterA(self.hconsole,c_wchar(' '),line_length,line_start,byref(chars_written))
+			windll.kernel32.FillConsoleOutputAttribute(self.hconsole,sbinfo.Attributes,line_length,line_start,byref(chars_written))
+		def clear_screen(self,param):
+			mode=to_int(param,0)
+			sbinfo=self.screen_buffer_info()
+			if mode==1:
+				clear_start=COORD(0,0)
+				clear_length=sbinfo.CursorPosition.X*sbinfo.CursorPosition.Y
+			elif mode==2:
+				clear_start=COORD(0,0)
+				clear_length=sbinfo.Size.X*sbinfo.Size.Y
+				windll.kernel32.SetConsoleCursorPosition(self.hconsole,clear_start)
+			else:
+				clear_start=sbinfo.CursorPosition
+				clear_length=((sbinfo.Size.X-sbinfo.CursorPosition.X)+sbinfo.Size.X*(sbinfo.Size.Y-sbinfo.CursorPosition.Y))
+			chars_written=c_int()
+			windll.kernel32.FillConsoleOutputCharacterA(self.hconsole,c_wchar(' '),clear_length,clear_start,byref(chars_written))
+			windll.kernel32.FillConsoleOutputAttribute(self.hconsole,sbinfo.Attributes,clear_length,clear_start,byref(chars_written))
+		def push_cursor(self,param):
+			sbinfo=self.screen_buffer_info()
+			self.cursor_history.append(sbinfo.CursorPosition)
+		def pop_cursor(self,param):
+			if self.cursor_history:
+				old_pos=self.cursor_history.pop()
+				windll.kernel32.SetConsoleCursorPosition(self.hconsole,old_pos)
+		def set_cursor(self,param):
+			y,sep,x=param.partition(';')
+			x=to_int(x,1)-1
+			y=to_int(y,1)-1
+			sbinfo=self.screen_buffer_info()
+			new_pos=COORD(min(max(0,x),sbinfo.Size.X),min(max(0,y),sbinfo.Size.Y))
+			windll.kernel32.SetConsoleCursorPosition(self.hconsole,new_pos)
+		def set_column(self,param):
+			x=to_int(param,1)-1
+			sbinfo=self.screen_buffer_info()
+			new_pos=COORD(min(max(0,x),sbinfo.Size.X),sbinfo.CursorPosition.Y)
+			windll.kernel32.SetConsoleCursorPosition(self.hconsole,new_pos)
+		def move_cursor(self,x_offset=0,y_offset=0):
+			sbinfo=self.screen_buffer_info()
+			new_pos=COORD(min(max(0,sbinfo.CursorPosition.X+x_offset),sbinfo.Size.X),min(max(0,sbinfo.CursorPosition.Y+y_offset),sbinfo.Size.Y))
+			windll.kernel32.SetConsoleCursorPosition(self.hconsole,new_pos)
+		def move_up(self,param):
+			self.move_cursor(y_offset=-to_int(param,1))
+		def move_down(self,param):
+			self.move_cursor(y_offset=to_int(param,1))
+		def move_left(self,param):
+			self.move_cursor(x_offset=-to_int(param,1))
+		def move_right(self,param):
+			self.move_cursor(x_offset=to_int(param,1))
+		def next_line(self,param):
+			sbinfo=self.screen_buffer_info()
+			self.move_cursor(x_offset=-sbinfo.CursorPosition.X,y_offset=to_int(param,1))
+		def prev_line(self,param):
+			sbinfo=self.screen_buffer_info()
+			self.move_cursor(x_offset=-sbinfo.CursorPosition.X,y_offset=-to_int(param,1))
+		def rgb2bgr(self,c):
+			return((c&1)<<2)|(c&2)|((c&4)>>2)
+		def set_color(self,param):
+			cols=param.split(';')
+			sbinfo=CONSOLE_SCREEN_BUFFER_INFO()
+			windll.kernel32.GetConsoleScreenBufferInfo(self.hconsole,byref(sbinfo))
+			attr=sbinfo.Attributes
+			for c in cols:
+				if is_vista:
+					c=int(c)
+				else:
+					c=to_int(c,0)
+				if c in range(30,38):
+					attr=(attr&0xfff0)|self.rgb2bgr(c-30)
+				elif c in range(40,48):
+					attr=(attr&0xff0f)|(self.rgb2bgr(c-40)<<4)
+				elif c==0:
+					attr=self.orig_sbinfo.Attributes
+				elif c==1:
+					attr|=0x08
+				elif c==4:
+					attr|=0x80
+				elif c==7:
+					attr=(attr&0xff88)|((attr&0x70)>>4)|((attr&0x07)<<4)
+			windll.kernel32.SetConsoleTextAttribute(self.hconsole,attr)
+		def show_cursor(self,param):
+			csinfo.bVisible=1
+			windll.kernel32.SetConsoleCursorInfo(self.hconsole,byref(csinfo))
+		def hide_cursor(self,param):
+			csinfo.bVisible=0
+			windll.kernel32.SetConsoleCursorInfo(self.hconsole,byref(csinfo))
+		ansi_command_table={'A':move_up,'B':move_down,'C':move_right,'D':move_left,'E':next_line,'F':prev_line,'G':set_column,'H':set_cursor,'f':set_cursor,'J':clear_screen,'K':clear_line,'h':show_cursor,'l':hide_cursor,'m':set_color,'s':push_cursor,'u':pop_cursor,}
+		ansi_tokens=re.compile('(?:\x1b\[([0-9?;]*)([a-zA-Z])|([^\x1b]+))')
+		def write(self,text):
+			try:
+				wlock.acquire()
+				for param,cmd,txt in self.ansi_tokens.findall(text):
+					if cmd:
+						cmd_func=self.ansi_command_table.get(cmd)
+						if cmd_func:
+							cmd_func(self,param)
+					else:
+						self.writeconsole(txt)
+			finally:
+				wlock.release()
+		def writeconsole(self,txt):
+			chars_written=c_int()
+			writeconsole=windll.kernel32.WriteConsoleA
+			if isinstance(txt,_type):
+				writeconsole=windll.kernel32.WriteConsoleW
+			TINY_STEP=3000
+			for x in range(0,len(txt),TINY_STEP):
+				tiny=txt[x:x+TINY_STEP]
+				writeconsole(self.hconsole,tiny,len(tiny),byref(chars_written),None)
+		def flush(self):
+			pass
+		def isatty(self):
+			return True
+	sys.stderr=sys.stdout=AnsiTerm()
+	os.environ['TERM']='vt100'
diff --git a/waflib/extras/__init__.py b/waflib/extras/__init__.py
new file mode 100644
index 0000000..efeed79
--- /dev/null
+++ b/waflib/extras/__init__.py
@@ -0,0 +1,4 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
diff --git a/waflib/extras/compat15.py b/waflib/extras/compat15.py
new file mode 100644
index 0000000..76851a2
--- /dev/null
+++ b/waflib/extras/compat15.py
@@ -0,0 +1,223 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import sys
+if sys.hexversion < 0x020400f0: from sets import Set as set
+import sys
+from waflib import ConfigSet,Logs,Options,Scripting,Task,Build,Configure,Node,Runner,TaskGen,Utils,Errors,Context
+sys.modules['Environment']=ConfigSet
+ConfigSet.Environment=ConfigSet.ConfigSet
+sys.modules['Logs']=Logs
+sys.modules['Options']=Options
+sys.modules['Scripting']=Scripting
+sys.modules['Task']=Task
+sys.modules['Build']=Build
+sys.modules['Configure']=Configure
+sys.modules['Node']=Node
+sys.modules['Runner']=Runner
+sys.modules['TaskGen']=TaskGen
+sys.modules['Utils']=Utils
+from waflib.Tools import c_preproc
+sys.modules['preproc']=c_preproc
+from waflib.Tools import c_config
+sys.modules['config_c']=c_config
+ConfigSet.ConfigSet.copy=ConfigSet.ConfigSet.derive
+ConfigSet.ConfigSet.set_variant=Utils.nada
+Build.BuildContext.add_subdirs=Build.BuildContext.recurse
+Build.BuildContext.new_task_gen=Build.BuildContext.__call__
+Build.BuildContext.is_install=0
+Node.Node.relpath_gen=Node.Node.path_from
+def name_to_obj(self,s,env=None):
+	Logs.warn('compat: change "name_to_obj(name, env)" by "get_tgen_by_name(name)"')
+	return self.get_tgen_by_name(s)
+Build.BuildContext.name_to_obj=name_to_obj
+def env_of_name(self,name):
+	try:
+		return self.all_envs[name]
+	except KeyError:
+		Logs.error('no such environment: '+name)
+		return None
+Build.BuildContext.env_of_name=env_of_name
+def set_env_name(self,name,env):
+	self.all_envs[name]=env
+	return env
+Configure.ConfigurationContext.set_env_name=set_env_name
+def retrieve(self,name,fromenv=None):
+	try:
+		env=self.all_envs[name]
+	except KeyError:
+		env=ConfigSet.ConfigSet()
+		self.prepare_env(env)
+		self.all_envs[name]=env
+	else:
+		if fromenv:Logs.warn("The environment %s may have been configured already"%name)
+	return env
+Configure.ConfigurationContext.retrieve=retrieve
+Configure.ConfigurationContext.sub_config=Configure.ConfigurationContext.recurse
+Configure.ConfigurationContext.check_tool=Configure.ConfigurationContext.load
+Configure.conftest=Configure.conf
+Configure.ConfigurationError=Errors.ConfigurationError
+Options.OptionsContext.sub_options=Options.OptionsContext.recurse
+Options.OptionsContext.tool_options=Context.Context.load
+Options.Handler=Options.OptionsContext
+Task.simple_task_type=Task.task_type_from_func=Task.task_factory
+Task.TaskBase.classes=Task.classes
+def setitem(self,key,value):
+	if key.startswith('CCFLAGS'):
+		key=key[1:]
+	self.table[key]=value
+ConfigSet.ConfigSet.__setitem__=setitem
+def old_importpaths(self):
+	if getattr(self,'importpaths',[]):
+		self.includes=self.importpaths
+from waflib import Context
+eld=Context.load_tool
+def load_tool(*k,**kw):
+	ret=eld(*k,**kw)
+	if'set_options'in ret.__dict__:
+		Logs.warn('compat: rename "set_options" to options')
+		ret.options=ret.set_options
+	if'detect'in ret.__dict__:
+		Logs.warn('compat: rename "detect" to "configure"')
+		ret.configure=ret.detect
+	return ret
+Context.load_tool=load_tool
+rev=Context.load_module
+def load_module(path):
+	ret=rev(path)
+	if'set_options'in ret.__dict__:
+		Logs.warn('compat: rename "set_options" to "options" (%r)'%path)
+		ret.options=ret.set_options
+	if'srcdir'in ret.__dict__:
+		Logs.warn('compat: rename "srcdir" to "top" (%r)'%path)
+		ret.top=ret.srcdir
+	if'blddir'in ret.__dict__:
+		Logs.warn('compat: rename "blddir" to "out" (%r)'%path)
+		ret.out=ret.blddir
+	return ret
+Context.load_module=load_module
+old_post=TaskGen.task_gen.post
+def post(self):
+	self.features=self.to_list(self.features)
+	if'cc'in self.features:
+		Logs.warn('compat: the feature cc does not exist anymore (use "c")')
+		self.features.remove('cc')
+		self.features.append('c')
+	if'cstaticlib'in self.features:
+		Logs.warn('compat: the feature cstaticlib does not exist anymore (use "cstlib" or "cxxstlib")')
+		self.features.remove('cstaticlib')
+		self.features.append(('cxx'in self.features)and'cxxstlib'or'cstlib')
+	if getattr(self,'ccflags',None):
+		Logs.warn('compat: "ccflags" was renamed to "cflags"')
+		self.cflags=self.ccflags
+	return old_post(self)
+TaskGen.task_gen.post=post
+def waf_version(*k,**kw):
+	Logs.warn('wrong version (waf_version was removed in waf 1.6)')
+Utils.waf_version=waf_version
+import os
+def apply_uselib_local(self):
+	env=self.env
+	from waflib.Tools.ccroot import stlink_task
+	self.uselib=self.to_list(getattr(self,'uselib',[]))
+	self.includes=self.to_list(getattr(self,'includes',[]))
+	names=self.to_list(getattr(self,'uselib_local',[]))
+	get=self.bld.get_tgen_by_name
+	seen=set([])
+	tmp=Utils.deque(names)
+	if tmp:
+		Logs.warn('compat: "uselib_local" is deprecated, replace by "use"')
+	while tmp:
+		lib_name=tmp.popleft()
+		if lib_name in seen:
+			continue
+		y=get(lib_name)
+		y.post()
+		seen.add(lib_name)
+		if getattr(y,'uselib_local',None):
+			for x in self.to_list(getattr(y,'uselib_local',[])):
+				obj=get(x)
+				obj.post()
+				if getattr(obj,'link_task',None):
+					if not isinstance(obj.link_task,stlink_task):
+						tmp.append(x)
+		if getattr(y,'link_task',None):
+			link_name=y.target[y.target.rfind(os.sep)+1:]
+			if isinstance(y.link_task,stlink_task):
+				env.append_value('STLIB',[link_name])
+			else:
+				env.append_value('LIB',[link_name])
+			self.link_task.set_run_after(y.link_task)
+			self.link_task.dep_nodes+=y.link_task.outputs
+			tmp_path=y.link_task.outputs[0].parent.bldpath()
+			if not tmp_path in env['LIBPATH']:
+				env.prepend_value('LIBPATH',[tmp_path])
+		for v in self.to_list(getattr(y,'uselib',[])):
+			if not env['STLIB_'+v]:
+				if not v in self.uselib:
+					self.uselib.insert(0,v)
+		if getattr(y,'export_includes',None):
+			self.includes.extend(y.to_incnodes(y.export_includes))
+def apply_objdeps(self):
+	names=getattr(self,'add_objects',[])
+	if not names:
+		return
+	names=self.to_list(names)
+	get=self.bld.get_tgen_by_name
+	seen=[]
+	while names:
+		x=names[0]
+		if x in seen:
+			names=names[1:]
+			continue
+		y=get(x)
+		if getattr(y,'add_objects',None):
+			added=0
+			lst=y.to_list(y.add_objects)
+			lst.reverse()
+			for u in lst:
+				if u in seen:continue
+				added=1
+				names=[u]+names
+			if added:continue
+		y.post()
+		seen.append(x)
+		for t in getattr(y,'compiled_tasks',[]):
+			self.link_task.inputs.extend(t.outputs)
+def process_obj_files(self):
+	if not hasattr(self,'obj_files'):
+		return
+	for x in self.obj_files:
+		node=self.path.find_resource(x)
+		self.link_task.inputs.append(node)
+def add_obj_file(self,file):
+	if not hasattr(self,'obj_files'):self.obj_files=[]
+	if not'process_obj_files'in self.meths:self.meths.append('process_obj_files')
+	self.obj_files.append(file)
+old_define=Configure.ConfigurationContext.__dict__['define']
+def define(self,key,val,quote=True):
+	old_define(self,key,val,quote)
+	if key.startswith('HAVE_'):
+		self.env[key]=1
+old_undefine=Configure.ConfigurationContext.__dict__['undefine']
+def undefine(self,key):
+	old_undefine(self,key)
+	if key.startswith('HAVE_'):
+		self.env[key]=0
+def set_incdirs(self,val):
+	Logs.warn('compat: change "export_incdirs" by "export_includes"')
+	self.export_includes=val
+TaskGen.task_gen.export_incdirs=property(None,set_incdirs)
+
+TaskGen.feature('d')(old_importpaths)
+TaskGen.before('apply_incpaths')(old_importpaths)
+TaskGen.feature('c','cxx','d')(apply_uselib_local)
+TaskGen.before('apply_incpaths','propagate_uselib_vars')(apply_uselib_local)
+TaskGen.after('apply_link','process_source')(apply_uselib_local)
+TaskGen.feature('cprogram','cxxprogram','cstlib','cxxstlib','cshlib','cxxshlib','dprogram','dstlib','dshlib')(apply_objdeps)
+TaskGen.after('apply_link')(apply_objdeps)
+TaskGen.after('apply_link')(process_obj_files)
+TaskGen.taskgen_method(add_obj_file)
+Configure.conf(define)
+Configure.conf(undefine)
\ No newline at end of file
diff --git a/waflib/fixpy2.py b/waflib/fixpy2.py
new file mode 100644
index 0000000..2e6962b
--- /dev/null
+++ b/waflib/fixpy2.py
@@ -0,0 +1,50 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# WARNING! Do not edit! http://waf.googlecode.com/git/docs/wafbook/single.html#_obtaining_the_waf_file
+
+import os
+all_modifs={}
+def fixdir(dir):
+	global all_modifs
+	for k in all_modifs:
+		for v in all_modifs[k]:
+			modif(os.path.join(dir,'waflib'),k,v)
+def modif(dir,name,fun):
+	if name=='*':
+		lst=[]
+		for y in'. Tools extras'.split():
+			for x in os.listdir(os.path.join(dir,y)):
+				if x.endswith('.py'):
+					lst.append(y+os.sep+x)
+		for x in lst:
+			modif(dir,x,fun)
+		return
+	filename=os.path.join(dir,name)
+	f=open(filename,'r')
+	txt=f.read()
+	f.close()
+	txt=fun(txt)
+	f=open(filename,'w')
+	f.write(txt)
+	f.close()
+def subst(*k):
+	def do_subst(fun):
+		global all_modifs
+		for x in k:
+			try:
+				all_modifs[x].append(fun)
+			except KeyError:
+				all_modifs[x]=[fun]
+		return fun
+	return do_subst
+def r1(code):
+	code=code.replace(',e:',',e:')
+	code=code.replace("",'')
+	code=code.replace('','')
+	return code
+def r4(code):
+	code=code.replace('next(self.biter)','self.biter.next()')
+	return code
+
+subst('*')(r1)
+subst('Runner.py')(r4)
\ No newline at end of file
diff --git a/wscript b/wscript
new file mode 100644
index 0000000..11e7d51
--- /dev/null
+++ b/wscript
@@ -0,0 +1,172 @@
+import commands
+import subprocess
+import os
+import Options
+import Scripting
+from waflib import Context
+
+out = 'build'
+top = '.'
+
+VERSION = '2012.12'
+APPNAME = 'glmark2'
+
+def options(opt):
+    opt.tool_options('gnu_dirs')
+    opt.tool_options('compiler_cc')
+    opt.tool_options('compiler_cxx')
+
+    opt.add_option('--enable-gl', action='store_true', dest = 'gl',
+                   default = False, help='build using OpenGL 2.0')
+    opt.add_option('--enable-glesv2', action='store_true', dest = 'glesv2',
+                   default = False, help='build using OpenGL ES 2.0')
+    opt.add_option('--enable-gl-drm', action='store_true', dest = 'gl_drm',
+                   default = False, help='build using OpenGL 2.0 without X')
+    opt.add_option('--enable-glesv2-drm', action='store_true',
+                   dest = 'glesv2_drm',
+                   default = False, help='build using OpenGL ES 2.0 without X')
+    opt.add_option('--no-debug', action='store_false', dest = 'debug',
+                   default = True, help='disable compiler debug information')
+    opt.add_option('--no-opt', action='store_false', dest = 'opt',
+                   default = True, help='disable compiler optimizations')
+    opt.add_option('--data-path', action='store', dest = 'data_path',
+                   help='path to main data (also see --data(root)dir)')
+    opt.add_option('--extras-path', action='store', dest = 'extras_path',
+                   help='path to additional data (models, shaders, textures)')
+
+def configure(ctx):
+    if not Options.options.gl and not Options.options.glesv2 and \
+       not Options.options.gl_drm and not Options.options.glesv2_drm:
+        ctx.fatal("You must configure using at least one of --enable-gl, " +
+                  "--enable-glesv2, --enable-gl-drm, --enable-glesv2-drm")
+
+    ctx.check_tool('gnu_dirs')
+    ctx.check_tool('compiler_cc')
+    ctx.check_tool('compiler_cxx')
+
+    # Check required headers
+    req_headers = ['stdlib.h', 'string.h', 'unistd.h', 'stdint.h', 'stdio.h', 'jpeglib.h']
+    for header in req_headers:
+        ctx.check_cxx(header_name = header, auto_add_header_name = True, mandatory = True)
+
+    # Check for required libs
+    req_libs = [('m', 'm'), ('jpeg', 'jpeg')]
+    for (lib, uselib) in req_libs:
+        ctx.check_cxx(lib = lib, uselib_store = uselib)
+
+    # Check required functions
+    req_funcs = [('memset', 'string.h', []) ,('sqrt', 'math.h', ['m'])]
+    for func, header, uselib in req_funcs:
+        ctx.check_cxx(function_name = func, header_name = header,
+                      uselib = uselib, mandatory = True)
+
+    # Check required packages
+    req_pkgs = [('libpng12', 'libpng12')]
+    for (pkg, uselib) in req_pkgs:
+        ctx.check_cfg(package = pkg, uselib_store = uselib,
+                      args = '--cflags --libs', mandatory = True)
+
+    # Check optional packages
+    opt_pkgs = [('x11', 'x11', Options.options.gl or Options.options.glesv2),
+                ('gl', 'gl', Options.options.gl or Options.options.gl_drm),
+                ('egl', 'egl', Options.options.glesv2 or
+                               Options.options.glesv2_drm),
+                ('glesv2', 'glesv2', Options.options.glesv2 or
+                                     Options.options.glesv2_drm),
+                ('libdrm','drm', Options.options.gl_drm or
+                                 Options.options.glesv2_drm),
+                ('gbm','gbm', Options.options.gl_drm or
+                              Options.options.glesv2_drm)]
+    for (pkg, uselib, mandatory) in opt_pkgs:
+        ctx.check_cfg(package = pkg, uselib_store = uselib,
+                      args = '--cflags --libs', mandatory = mandatory)
+
+    ctx.env.append_unique('CXXFLAGS', '-Werror -Wall -Wextra -Wnon-virtual-dtor'.split(' '))
+
+    # Prepend -O# and -g flags so that they can be overriden by the
+    # CFLAGS environment variable
+    if Options.options.opt:
+        ctx.env.prepend_value('CXXFLAGS', '-O2')
+    if Options.options.debug:
+        ctx.env.prepend_value('CXXFLAGS', '-g')
+
+    ctx.env.HAVE_EXTRAS = False
+    if Options.options.extras_path is not None:
+        ctx.env.HAVE_EXTRAS = True
+        ctx.env.append_unique('GLMARK_EXTRAS_PATH', Options.options.extras_path)
+        ctx.env.append_unique('DEFINES', 'GLMARK_EXTRAS_PATH="%s"' % Options.options.extras_path)
+
+    if Options.options.data_path is not None:
+        data_path = Options.options.data_path 
+    else:
+        data_path = os.path.join(ctx.env.DATADIR, 'glmark2')
+
+    ctx.env.append_unique('GLMARK_DATA_PATH', data_path)
+    ctx.env.append_unique('DEFINES', 'GLMARK_DATA_PATH="%s"' % data_path)
+    ctx.env.append_unique('DEFINES', 'GLMARK_VERSION="%s"' % VERSION)
+    ctx.env.GLMARK2_VERSION = VERSION
+
+    ctx.env.USE_GL = Options.options.gl
+    ctx.env.USE_GLESv2 = Options.options.glesv2
+    ctx.env.USE_GL_DRM = Options.options.gl_drm
+    ctx.env.USE_GLESv2_DRM = Options.options.glesv2_drm
+
+    ctx.msg("Prefix", ctx.env.PREFIX, color = 'PINK')
+    ctx.msg("Data path", data_path, color = 'PINK')
+    ctx.msg("Including extras", "Yes" if ctx.env.HAVE_EXTRAS else "No",
+            color = 'PINK');
+    if ctx.env.HAVE_EXTRAS:
+        ctx.msg("Extras path", Options.options.extras_path, color = 'PINK')
+    ctx.msg("Building X11 GL2 version", "Yes" if ctx.env.USE_GL else "No",
+            color = 'PINK')
+    ctx.msg("Building X11 GLESv2 version", "Yes" if ctx.env.USE_GLESv2 else "No",
+            color = 'PINK')
+    ctx.msg("Building DRM GL2 version", "Yes" if ctx.env.USE_GL_DRM else "No",
+            color = 'PINK')
+    ctx.msg("Building DRM GLESv2 version", "Yes" if ctx.env.USE_GLESv2_DRM else "No",
+            color = 'PINK')
+
+def build(ctx):
+    ctx.recurse('src')
+    ctx.recurse('data')
+    ctx.recurse('doc')
+
+class Glmark2Dist(Context.Context):
+    """ Custom dist command that preserves symbolic links"""
+
+    cmd = "dist"
+
+    def execute(self):
+        self.recurse([os.path.dirname(Context.g_module.root_path)])
+        self.archive()
+
+    def get_files(self):
+        import fnmatch
+        files = []
+        excludes = ['*.bzr', '*~', './.*waf*', './build*', '*.swp', '*.pyc', '*glmark2-*.tar.gz']
+        for (dirpath, dirnames, filenames) in os.walk(top):
+            names_to_remove = []
+            names = dirnames + filenames
+            for n in names:
+                for exclude in excludes:
+                    if fnmatch.fnmatch(os.path.join(dirpath, n), exclude):
+                        names_to_remove.append(n)
+                        break
+
+            for d in names_to_remove:
+                if d in dirnames:
+                    dirnames.remove(d)
+                if d in filenames:
+                    filenames.remove(d)
+
+            files.extend([os.path.join(dirpath, d) for d in dirnames])
+            files.extend([os.path.join(dirpath, f) for f in filenames])
+
+        return files
+
+    def archive(self):
+        import tarfile
+        tar = tarfile.open(APPNAME + '-' + VERSION + '.tar.gz', 'w:gz')
+        for f in self.get_files():
+            tar.add(f, arcname = APPNAME + '-' + VERSION + '/' + f, recursive = False)
+        tar.close()