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 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 58 static void my_output_message(j_common_ptr cinfo) 59 { 60 (*cinfo->err->format_message)(cinfo, lasterror); 61 } 62 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
