text: /*
   * 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;
  }
  