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107 lines
2.4 KiB
C
107 lines
2.4 KiB
C
/*
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* jcstest.c
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*
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* Copyright (C) 2011, 2025, D. R. Commander.
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* For conditions of distribution and use, see the accompanying README.ijg
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* file.
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*/
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/* This program demonstrates how to check for the colorspace extension
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capabilities of libjpeg-turbo at both compile time and run time. */
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#include <stdio.h>
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#include "jpeglib.h"
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#include "jerror.h"
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#include <setjmp.h>
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#ifndef JCS_EXTENSIONS
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#define JCS_EXT_RGB 6
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#endif
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#if !defined(JCS_EXTENSIONS) || !defined(JCS_ALPHA_EXTENSIONS)
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#define JCS_EXT_RGBA 12
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#endif
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static char lasterror[JMSG_LENGTH_MAX] = "No error";
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typedef struct _error_mgr {
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struct jpeg_error_mgr pub;
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jmp_buf jb;
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} error_mgr;
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static void my_error_exit(j_common_ptr cinfo)
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{
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error_mgr *myerr = (error_mgr *)cinfo->err;
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(*cinfo->err->output_message) (cinfo);
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longjmp(myerr->jb, 1);
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}
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static void my_output_message(j_common_ptr cinfo)
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{
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(*cinfo->err->format_message) (cinfo, lasterror);
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}
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int main(void)
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{
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int jcs_valid = -1, jcs_alpha_valid = -1;
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struct jpeg_compress_struct cinfo;
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error_mgr jerr;
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printf("libjpeg-turbo colorspace extensions:\n");
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#if JCS_EXTENSIONS
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printf(" Present at compile time\n");
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#else
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printf(" Not present at compile time\n");
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#endif
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cinfo.err = jpeg_std_error(&jerr.pub);
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jerr.pub.error_exit = my_error_exit;
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jerr.pub.output_message = my_output_message;
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if (setjmp(jerr.jb)) {
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/* this will execute if libjpeg has an error */
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jcs_valid = 0;
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goto done;
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}
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jpeg_create_compress(&cinfo);
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cinfo.input_components = 3;
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jpeg_set_defaults(&cinfo);
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cinfo.in_color_space = JCS_EXT_RGB;
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jpeg_default_colorspace(&cinfo);
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jcs_valid = 1;
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done:
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if (jcs_valid)
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printf(" Working properly\n");
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else
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printf(" Not working properly. Error returned was:\n %s\n",
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lasterror);
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printf("libjpeg-turbo alpha colorspace extensions:\n");
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#if JCS_ALPHA_EXTENSIONS
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printf(" Present at compile time\n");
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#else
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printf(" Not present at compile time\n");
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#endif
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if (setjmp(jerr.jb)) {
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/* this will execute if libjpeg has an error */
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jcs_alpha_valid = 0;
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goto done2;
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}
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cinfo.in_color_space = JCS_EXT_RGBA;
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jpeg_default_colorspace(&cinfo);
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jcs_alpha_valid = 1;
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done2:
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if (jcs_alpha_valid)
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printf(" Working properly\n");
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else
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printf(" Not working properly. Error returned was:\n %s\n",
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lasterror);
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jpeg_destroy_compress(&cinfo);
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return 0;
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}
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