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+/*
+ * Copyright (C)2011, 2013 D. R. Commander.  All Rights Reserved.
+ *
+ * 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.
+ */
+
+package org.libjpegturbo.turbojpeg;
+
+/**
+ * TurboJPEG lossless transformer
+ */
+public class TJTransformer extends TJDecompressor {
+
+  /**
+   * Create a TurboJPEG lossless transformer instance.
+   */
+  public TJTransformer() throws Exception {
+    init();
+  }
+
+  /**
+   * Create a TurboJPEG lossless transformer instance and associate the JPEG
+   * image stored in <code>jpegImage</code> with the newly-created instance.
+   *
+   * @param jpegImage JPEG image buffer (size of the JPEG image is assumed to
+   * be the length of the array)
+   */
+  public TJTransformer(byte[] jpegImage) throws Exception {
+    init();
+    setJPEGImage(jpegImage, jpegImage.length);
+  }
+
+  /**
+   * Create a TurboJPEG lossless transformer instance and associate the JPEG
+   * image of length <code>imageSize</code> bytes stored in
+   * <code>jpegImage</code> with the newly-created instance.
+   *
+   * @param jpegImage JPEG image buffer
+   *
+   * @param imageSize size of the JPEG image (in bytes)
+   */
+  public TJTransformer(byte[] jpegImage, int imageSize) throws Exception {
+    init();
+    setJPEGImage(jpegImage, imageSize);
+  }
+
+  /**
+   * Losslessly transform the JPEG image associated with this transformer
+   * instance into one or more JPEG images stored in the given destination
+   * buffers.  Lossless transforms work by moving the raw coefficients from one
+   * JPEG image structure to another without altering the values of the
+   * coefficients.  While this is typically faster than decompressing the
+   * image, transforming it, and re-compressing it, lossless transforms are not
+   * free.  Each lossless transform requires reading and performing Huffman
+   * decoding on all of the coefficients in the source image, regardless of the
+   * size of the destination image.  Thus, this method provides a means of
+   * generating multiple transformed images from the same source or of applying
+   * multiple transformations simultaneously, in order to eliminate the need to
+   * read the source coefficients multiple times.
+   *
+   * @param dstBufs an array of image buffers.  <code>dstbufs[i]</code> will
+   * receive a JPEG image that has been transformed using the parameters in
+   * <code>transforms[i]</code>.  Use {@link TJ#bufSize} to determine the
+   * maximum size for each buffer based on the transformed or cropped width and
+   * height.
+   *
+   * @param transforms an array of {@link TJTransform} instances, each of
+   * which specifies the transform parameters and/or cropping region for the
+   * corresponding transformed output image
+   *
+   * @param flags the bitwise OR of one or more of {@link TJ TJ.FLAG_*}
+   */
+  public void transform(byte[][] dstBufs, TJTransform[] transforms,
+                        int flags) throws Exception {
+    if (jpegBuf == null)
+      throw new Exception("JPEG buffer not initialized");
+    transformedSizes = transform(jpegBuf, jpegBufSize, dstBufs, transforms,
+                                 flags);
+  }
+
+  /**
+   * Losslessly transform the JPEG image associated with this transformer
+   * instance and return an array of {@link TJDecompressor} instances, each of
+   * which has a transformed JPEG image associated with it.
+   *
+   * @param transforms an array of {@link TJTransform} instances, each of
+   * which specifies the transform parameters and/or cropping region for the
+   * corresponding transformed output image
+   *
+   * @return an array of {@link TJDecompressor} instances, each of
+   * which has a transformed JPEG image associated with it
+   *
+   * @param flags the bitwise OR of one or more of {@link TJ TJ.FLAG_*}
+   */
+  public TJDecompressor[] transform(TJTransform[] transforms, int flags)
+    throws Exception {
+    byte[][] dstBufs = new byte[transforms.length][];
+    if (jpegWidth < 1 || jpegHeight < 1)
+      throw new Exception("JPEG buffer not initialized");
+    for (int i = 0; i < transforms.length; i++) {
+      int w = jpegWidth, h = jpegHeight;
+      if ((transforms[i].options & TJTransform.OPT_CROP) != 0) {
+        if (transforms[i].width != 0) w = transforms[i].width;
+        if (transforms[i].height != 0) h = transforms[i].height;
+      }
+      dstBufs[i] = new byte[TJ.bufSize(w, h, jpegSubsamp)];
+    }
+    TJDecompressor[] tjd = new TJDecompressor[transforms.length];
+    transform(dstBufs, transforms, flags);
+    for (int i = 0; i < transforms.length; i++)
+      tjd[i] = new TJDecompressor(dstBufs[i], transformedSizes[i]);
+    return tjd;
+  }
+
+  /**
+   * Returns an array containing the sizes of the transformed JPEG images from
+   * the most recent call to {@link #transform transform()}.
+   *
+   * @return an array containing the sizes of the transformed JPEG images from
+   * the most recent call to {@link #transform transform()}
+   */
+  public int[] getTransformedSizes() throws Exception {
+    if (transformedSizes == null)
+      throw new Exception("No image has been transformed yet");
+    return transformedSizes;
+  }
+
+  private native void init() throws Exception;
+
+  private native int[] transform(byte[] srcBuf, int srcSize, byte[][] dstBufs,
+    TJTransform[] transforms, int flags) throws Exception;
+
+  static {
+    TJLoader.load();
+  }
+
+  private int[] transformedSizes = null;
+};