/*

 * 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></stdio.h>

#include <jpeglib.h></jpeglib.h>

#include <jerror.h></jerror.h>

#include <setjmp.h></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;

}