1/*
2 * Copyright (C)2011 D. R. Commander.  All Rights Reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *
7 * - Redistributions of source code must retain the above copyright notice,
8 *   this list of conditions and the following disclaimer.
9 * - Redistributions in binary form must reproduce the above copyright notice,
10 *   this list of conditions and the following disclaimer in the documentation
11 *   and/or other materials provided with the distribution.
12 * - Neither the name of the libjpeg-turbo Project nor the names of its
13 *   contributors may be used to endorse or promote products derived from this
14 *   software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS",
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/* This program demonstrates how to check for the colorspace extension
30   capabilities of libjpeg-turbo at both compile time and run time. */
31
32#include <stdio.h>
33#include <jpeglib.h>
34#include <jerror.h>
35#include <setjmp.h>
36
37#ifndef JCS_EXTENSIONS
38#define JCS_EXT_RGB 6
39#endif
40#if !defined(JCS_EXTENSIONS) || !defined(JCS_ALPHA_EXTENSIONS)
41#define JCS_EXT_RGBA 12
42#endif
43
44static char lasterror[JMSG_LENGTH_MAX] = "No error";
45
46typedef struct _error_mgr {
47  struct jpeg_error_mgr pub;
48  jmp_buf jb;
49} error_mgr;
50
51static void my_error_exit(j_common_ptr cinfo)
52{
53  error_mgr *myerr = (error_mgr *)cinfo->err;
54  (*cinfo->err->output_message)(cinfo);
55  longjmp(myerr->jb, 1);
56}
57
58static void my_output_message(j_common_ptr cinfo)
59{
60  (*cinfo->err->format_message)(cinfo, lasterror);
61}
62
63int main(void)
64{
65  int jcs_valid = -1, jcs_alpha_valid = -1;
66  struct jpeg_compress_struct cinfo;
67  error_mgr jerr;
68
69  printf("libjpeg-turbo colorspace extensions:\n");
70  #if JCS_EXTENSIONS
71  printf("  Present at compile time\n");
72  #else
73  printf("  Not present at compile time\n");
74  #endif
75
76  cinfo.err = jpeg_std_error(&jerr.pub);
77  jerr.pub.error_exit = my_error_exit;
78  jerr.pub.output_message = my_output_message;
79
80  if(setjmp(jerr.jb)) {
81    /* this will execute if libjpeg has an error */
82    jcs_valid = 0;
83    goto done;
84  }
85
86  jpeg_create_compress(&cinfo);
87  cinfo.input_components = 3;
88  jpeg_set_defaults(&cinfo);
89  cinfo.in_color_space = JCS_EXT_RGB;
90  jpeg_default_colorspace(&cinfo);
91  jcs_valid = 1;
92
93  done:
94  if (jcs_valid)
95    printf("  Working properly\n");
96  else
97    printf("  Not working properly.  Error returned was:\n    %s\n",
98           lasterror);
99
100  printf("libjpeg-turbo alpha colorspace extensions:\n");
101  #if JCS_ALPHA_EXTENSIONS
102  printf("  Present at compile time\n");
103  #else
104  printf("  Not present at compile time\n");
105  #endif
106
107  if(setjmp(jerr.jb)) {
108    /* this will execute if libjpeg has an error */
109    jcs_alpha_valid = 0;
110    goto done2;
111  }
112
113  cinfo.in_color_space = JCS_EXT_RGBA;
114  jpeg_default_colorspace(&cinfo);
115  jcs_alpha_valid = 1;
116
117  done2:
118  if (jcs_alpha_valid)
119    printf("  Working properly\n");
120  else
121    printf("  Not working properly.  Error returned was:\n    %s\n",
122           lasterror);
123
124  jpeg_destroy_compress(&cinfo);
125  return 0;
126}
127