kc3-lang/libjpeg-turbo/src/jcstest.c

Branch - branch -main

• Show log

  Commit

• Hash : f74989d8
  Author :
  Date : 2025-09-25T11:32:45
  

  Clean up #include directives
  
  This is subtle, but #include <header.h> searches directories specified
  with -I, then system include directories.  #include "header.h" searches
  the current source directory, then directories specified with -I, then
  system include directories.
  
  Using bracketed #include directives for jpeglib.h, jinclude.h, jerror.h,
  cdjpeg.h, and turbojpeg.h only worked because the build system
  explicitly passed -I{source_directory}/src/ to the compiler.  Referring
  to 51cee0362998ec6f1eabac1e795f3b6e3ee639ea, it's better for the source
  code to have as few dependencies on our specific build system as
  possible.
  
  Since jpeglib.h, jinclude.h, jerror.h, and turbojpeg.h can be installed
  in system include directories, it's also better for internal references
  to those headers to resolve internally first, to avoid potential
  conflicts between the system-installed version of libjpeg-turbo and the
  version being built.  (Such conflicts would never have occurred with our
  build system, but they might have occurred due to misintegration with a
  downstream build system.)
  

Download

• src/jcstest.c

• /*
   * Copyright (C)2011, 2025 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;
  }
  

Download