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Diffstat (limited to 'jcstest.c')
-rw-r--r-- | jcstest.c | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/jcstest.c b/jcstest.c new file mode 100644 index 0000000..98f16da --- /dev/null +++ b/jcstest.c @@ -0,0 +1,126 @@ +/* + * Copyright (C)2011 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. + */ + +/* This program demonstrates how to check for the colorspace extension + capabilities of libjpeg-turbo at both compile time and run time. */ + +#include <stdio.h> +#include <jpeglib.h> +#include <jerror.h> +#include <setjmp.h> + +#ifndef JCS_EXTENSIONS +#define JCS_EXT_RGB 6 +#endif +#if !defined(JCS_EXTENSIONS) || !defined(JCS_ALPHA_EXTENSIONS) +#define JCS_EXT_RGBA 12 +#endif + +static char lasterror[JMSG_LENGTH_MAX] = "No error"; + +typedef struct _error_mgr { + struct jpeg_error_mgr pub; + jmp_buf jb; +} error_mgr; + +static void my_error_exit(j_common_ptr cinfo) +{ + error_mgr *myerr = (error_mgr *)cinfo->err; + (*cinfo->err->output_message)(cinfo); + longjmp(myerr->jb, 1); +} + +static void my_output_message(j_common_ptr cinfo) +{ + (*cinfo->err->format_message)(cinfo, lasterror); +} + +int main(void) +{ + int jcs_valid = -1, jcs_alpha_valid = -1; + struct jpeg_compress_struct cinfo; + error_mgr jerr; + + printf("libjpeg-turbo colorspace extensions:\n"); + #if JCS_EXTENSIONS + printf(" Present at compile time\n"); + #else + printf(" Not present at compile time\n"); + #endif + + cinfo.err = jpeg_std_error(&jerr.pub); + jerr.pub.error_exit = my_error_exit; + jerr.pub.output_message = my_output_message; + + if(setjmp(jerr.jb)) { + // this will execute if libjpeg has an error + jcs_valid = 0; + goto done; + } + + jpeg_create_compress(&cinfo); + cinfo.input_components = 3; + jpeg_set_defaults(&cinfo); + cinfo.in_color_space = JCS_EXT_RGB; + jpeg_default_colorspace(&cinfo); + jcs_valid = 1; + + done: + if (jcs_valid) + printf(" Working properly\n"); + else + printf(" Not working properly. Error returned was:\n %s\n", + lasterror); + + printf("libjpeg-turbo alpha colorspace extensions:\n"); + #if JCS_ALPHA_EXTENSIONS + printf(" Present at compile time\n"); + #else + printf(" Not present at compile time\n"); + #endif + + if(setjmp(jerr.jb)) { + // this will execute if libjpeg has an error + jcs_alpha_valid = 0; + goto done2; + } + + cinfo.in_color_space = JCS_EXT_RGBA; + jpeg_default_colorspace(&cinfo); + jcs_alpha_valid = 1; + + done2: + if (jcs_alpha_valid) + printf(" Working properly\n"); + else + printf(" Not working properly. Error returned was:\n %s\n", + lasterror); + + jpeg_destroy_compress(&cinfo); + return 0; +} |