libopenraw
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00001 /* 00002 * libopenraw - jfifcontainer.h 00003 * 00004 * Copyright (C) 2006-2007 Hubert Figuiere 00005 * 00006 * This library is free software: you can redistribute it and/or 00007 * modify it under the terms of the GNU Lesser General Public License 00008 * as published by the Free Software Foundation, either version 3 of 00009 * the License, or (at your option) any later version. 00010 * 00011 * This library is distributed in the hope that it will be useful, 00012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00014 * Lesser General Public License for more details. 00015 * 00016 * You should have received a copy of the GNU Lesser General Public 00017 * License along with this library. If not, see 00018 * <http://www.gnu.org/licenses/>. 00019 */ 00020 00021 00022 00028 #ifndef _JFIFCONTAINER_H_ 00029 #define _JFIFCONTAINER_H_ 00030 00031 #include <setjmp.h> 00032 #include <cstdio> 00033 00034 namespace JPEG { 00035 #include <jpeglib.h> 00036 } 00037 00038 #include <libopenraw/types.h> 00039 #include <libopenraw/consts.h> 00040 00041 #include "exception.h" 00042 #include "rawcontainer.h" 00043 00044 namespace OpenRaw { 00045 00046 class BitmapData; 00047 00048 namespace Internals { 00049 00050 class JFIFContainer 00051 : public RawContainer 00052 { 00053 public: 00054 JFIFContainer(IO::Stream *file, off_t offset); 00056 virtual ~JFIFContainer(); 00057 00058 bool getDimensions(uint32_t &x, uint32_t &y); 00059 bool getDecompressedData(BitmapData &data); 00060 00061 /* libjpeg callbacks j_ is the prefix for these callbacks */ 00062 static void j_init_source(JPEG::j_decompress_ptr cinfo); 00063 static JPEG::boolean j_fill_input_buffer(JPEG::j_decompress_ptr cinfo); 00064 static void j_skip_input_data(JPEG::j_decompress_ptr cinfo, 00065 long num_bytes); 00066 // static void j_jpeg_resync_to_restart(JPEG::j_decompress_ptr cinfo); 00067 static void j_term_source(JPEG::j_decompress_ptr cinfo); 00068 static void j_error_exit(JPEG::j_common_ptr cinfo); 00069 00070 private: 00071 int _loadHeader(); 00072 00073 struct JPEG::jpeg_decompress_struct m_cinfo; 00074 struct JPEG::jpeg_error_mgr m_jerr; 00075 jmp_buf m_jpegjmp; 00076 bool m_headerLoaded; 00077 }; 00078 00079 } 00080 } 00081 00082 #endif