| /* |
| Copyright 2005-2010 Intel Corporation. All Rights Reserved. |
| |
| This file is part of Threading Building Blocks. |
| |
| Threading Building Blocks is free software; you can redistribute it |
| and/or modify it under the terms of the GNU General Public License |
| version 2 as published by the Free Software Foundation. |
| |
| Threading Building Blocks is distributed in the hope that it will be |
| useful, but WITHOUT ANY WARRANTY; without even the implied warranty |
| of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with Threading Building Blocks; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| |
| As a special exception, you may use this file as part of a free software |
| library without restriction. Specifically, if other files instantiate |
| templates or use macros or inline functions from this file, or you compile |
| this file and link it with other files to produce an executable, this |
| file does not by itself cause the resulting executable to be covered by |
| the GNU General Public License. This exception does not however |
| invalidate any other reasons why the executable file might be covered by |
| the GNU General Public License. |
| */ |
| |
| /* |
| The original source for this example is |
| Copyright (c) 1994-2008 John E. Stone |
| All rights reserved. |
| |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions |
| are met: |
| 1. Redistributions of source code must retain the above copyright |
| notice, this list of conditions and the following disclaimer. |
| 2. 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. |
| 3. The name of the author may not be used to endorse or promote products |
| derived from this software without specific prior written permission. |
| |
| THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. |
| */ |
| |
| /* |
| * jpeg.c - This file deals with JPEG format image files (reading/writing) |
| * |
| * $Id: jpeg.cpp,v 1.1.1.1 2012/03/29 17:22:19 uid42307 Exp $ |
| */ |
| |
| /* |
| * This code requires support from the Independent JPEG Group's libjpeg. |
| * For our puposes, we're interested only in the 3 byte per pixel 24 bit |
| * RGB output. Probably won't implement any decent checking at this point. |
| */ |
| |
| #include <stdio.h> |
| #include "machine.h" |
| #include "types.h" |
| #include "util.h" |
| #include "imageio.h" /* error codes etc */ |
| #include "jpeg.h" /* the protos for this file */ |
| |
| #if !defined(USEJPEG) |
| |
| int readjpeg(char * name, int * xres, int * yres, unsigned char **imgdata) { |
| return IMAGEUNSUP; |
| } |
| |
| #else |
| |
| #include "jpeglib.h" /* the IJG jpeg library headers */ |
| |
| int readjpeg(char * name, int * xres, int * yres, unsigned char **imgdata) { |
| FILE * ifp; |
| struct jpeg_decompress_struct cinfo; /* JPEG decompression struct */ |
| struct jpeg_error_mgr jerr; /* JPEG Error handler */ |
| JSAMPROW row_pointer[1]; /* output row buffer */ |
| int row_stride; /* physical row width in output buf */ |
| |
| /* open input file before doing any JPEG decompression setup */ |
| if ((ifp = fopen(name, "rb")) == NULL) |
| return IMAGEBADFILE; /* Could not open image, return error */ |
| |
| /* |
| * Note: The Independent JPEG Group's library does not have a way |
| * of returning errors without the use of setjmp/longjmp. |
| * This is a problem in multi-threaded environment, since setjmp |
| * and longjmp are declared thread-unsafe by many vendors currently. |
| * For now, JPEG decompression errors will result in the "default" |
| * error handling provided by the JPEG library, which is an error |
| * message and a fatal call to exit(). I'll have to work around this |
| * or find a reasonably thread-safe way of doing setjmp/longjmp.. |
| */ |
| |
| cinfo.err = jpeg_std_error(&jerr); /* Set JPEG error handler to default */ |
| |
| jpeg_create_decompress(&cinfo); /* Create decompression context */ |
| jpeg_stdio_src(&cinfo, ifp); /* Set input mechanism to stdio type */ |
| jpeg_read_header(&cinfo, TRUE); /* Read the JPEG header for info */ |
| jpeg_start_decompress(&cinfo); /* Prepare for actual decompression */ |
| |
| *xres = cinfo.output_width; /* set returned image width */ |
| *yres = cinfo.output_height; /* set returned image height */ |
| |
| /* Calculate the size of a row in the image */ |
| row_stride = cinfo.output_width * cinfo.output_components; |
| |
| /* Allocate the image buffer which will be returned to the ray tracer */ |
| *imgdata = (unsigned char *) malloc(row_stride * cinfo.output_height); |
| |
| /* decompress the JPEG, one scanline at a time into the buffer */ |
| while (cinfo.output_scanline < cinfo.output_height) { |
| row_pointer[0] = &((*imgdata)[(cinfo.output_scanline)*row_stride]); |
| jpeg_read_scanlines(&cinfo, row_pointer, 1); |
| } |
| |
| jpeg_finish_decompress(&cinfo); /* Tell the JPEG library to cleanup */ |
| jpeg_destroy_decompress(&cinfo); /* Destroy JPEG decompression context */ |
| |
| fclose(ifp); /* Close the input file */ |
| |
| return IMAGENOERR; /* No fatal errors */ |
| } |
| |
| #endif |
