| /* |
| * Copyright (C)2011 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; |
| } |