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author | DRC <dcommander@users.sourceforge.net> | 2011-12-19 15:01:55 +0000 |
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committer | DRC <dcommander@users.sourceforge.net> | 2011-12-19 15:01:55 +0000 |
commit | b76c8404e3131868246354a996895a76308791dc (patch) | |
tree | 03134d7244728eaf88b5d4517288111ecef7277c | |
parent | 67ce3b2352fe1f7511edbfed74ec6960e41e97dc (diff) | |
download | libjpeg-turbo-b76c8404e3131868246354a996895a76308791dc.tar.gz |
Add program that demonstrates how to check for the existence of the colorspace extensions
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@733 632fc199-4ca6-4c93-a231-07263d6284db
-rw-r--r-- | Makefile.am | 5 | ||||
-rwxr-xr-x | README-turbo.txt | 7 | ||||
-rw-r--r-- | jcstest.c | 126 | ||||
-rwxr-xr-x | sharedlib/CMakeLists.txt | 3 |
4 files changed, 138 insertions, 3 deletions
diff --git a/Makefile.am b/Makefile.am index 560af9a4..f2219b03 100644 --- a/Makefile.am +++ b/Makefile.am @@ -73,7 +73,7 @@ libjpeg_la_SOURCES += jsimd_none.c endif bin_PROGRAMS = cjpeg djpeg jpegtran rdjpgcom wrjpgcom tjbench -noinst_PROGRAMS = tjunittest +noinst_PROGRAMS = tjunittest jcstest tjbench_SOURCES = tjbench.c bmp.h bmp.c tjutil.h tjutil.c rdbmp.c rdppm.c \ wrbmp.c wrppm.c @@ -114,6 +114,9 @@ wrjpgcom_SOURCES = wrjpgcom.c wrjpgcom_LDADD = libjpeg.la +jcstest_SOURCES = jcstest.c + +jcstest_LDADD = libjpeg.la dist_man1_MANS = cjpeg.1 djpeg.1 jpegtran.1 rdjpgcom.1 wrjpgcom.1 diff --git a/README-turbo.txt b/README-turbo.txt index 8b18d4c1..327647c3 100755 --- a/README-turbo.txt +++ b/README-turbo.txt @@ -227,7 +227,7 @@ colorspace constants: Setting cinfo.in_color_space (compression) or cinfo.out_color_space (decompression) to one of these values will cause libjpeg-turbo to read the red, green, and blue values from (or write them to) the appropriate position in -the pixel when YUV conversion is performed. +the pixel when compressing from/decompressing to an RGB buffer. Your application can check for the existence of these extensions at compile time with: @@ -240,7 +240,7 @@ that doesn't support them will result in a "Bogus input colorspace" error. When using the RGBX, BGRX, XBGR, and XRGB colorspaces during decompression, the X byte is undefined, and in order to ensure the best performance, libjpeg-turbo can set that byte to whatever value it wishes. If an application expects the X -byte to be used as an alpha channel, then it should use JCS_EXT_RGBA, +byte to be used as an alpha channel, then it should specify JCS_EXT_RGBA, JCS_EXT_BGRA, JCS_EXT_ABGR, or JCS_EXT_ARGB. When these colorspace constants are used, the X byte is guaranteed to be 0xFF, which is interpreted as opaque. @@ -249,6 +249,9 @@ extensions at compile time with: #ifdef JCS_ALPHA_EXTENSIONS +jcstest.c, located in the libjpeg-turbo source tree, demonstrates how to check +for the existence of the colorspace extensions at compile time and run time. + ================================= libjpeg v7 and v8 API/ABI support ================================= diff --git a/jcstest.c b/jcstest.c new file mode 100644 index 00000000..98f16da6 --- /dev/null +++ b/jcstest.c @@ -0,0 +1,126 @@ +/* + * 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; +} diff --git a/sharedlib/CMakeLists.txt b/sharedlib/CMakeLists.txt index 97e06e39..25ddbdf7 100755 --- a/sharedlib/CMakeLists.txt +++ b/sharedlib/CMakeLists.txt @@ -53,6 +53,9 @@ add_executable(jpegtran ../jpegtran.c ../cdjpeg.c ../rdswitch.c ../transupp.c) target_link_libraries(jpegtran jpeg) set_property(TARGET jpegtran PROPERTY COMPILE_FLAGS "-DUSE_SETMODE") +add_executable(jcstest ../jcstest.c) +target_link_libraries(jcstest jpeg) + install(TARGETS jpeg cjpeg djpeg jpegtran ARCHIVE DESTINATION lib LIBRARY DESTINATION lib |