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
44 static char lasterror[JMSG_LENGTH_MAX] = "No error";
45
46 typedef struct _error_mgr {
47 struct jpeg_error_mgr pub;
48 jmp_buf jb;
49 } error_mgr;
50
my_error_exit(j_common_ptr cinfo)51 static 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
my_output_message(j_common_ptr cinfo)58 static void my_output_message(j_common_ptr cinfo)
59 {
60 (*cinfo->err->format_message)(cinfo, lasterror);
61 }
62
main(void)63 int 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