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/*
* 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;
}
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