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jpeg.hpp

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00001 /*
00002   CLAW - a C++ Library Absolutely Wonderful
00003 
00004   CLAW is a free library without any particular aim but being useful to 
00005   anyone.
00006 
00007   Copyright (C) 2005-2008 Julien Jorge
00008 
00009   This library is free software; you can redistribute it and/or
00010   modify it under the terms of the GNU Lesser General Public
00011   License as published by the Free Software Foundation; either
00012   version 2.1 of the License, or (at your option) any later version.
00013 
00014   This library is distributed in the hope that it will be useful,
00015   but WITHOUT ANY WARRANTY; without even the implied warranty of
00016   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00017   Lesser General Public License for more details.
00018 
00019   You should have received a copy of the GNU Lesser General Public
00020   License along with this library; if not, write to the Free Software
00021   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
00022 
00023   contact: julien_jorge@yahoo.fr
00024 */
00030 #ifndef __CLAW_JPEG_HPP__
00031 #define __CLAW_JPEG_HPP__
00032 
00033 #include <claw/image.hpp>
00034 #include <setjmp.h>
00035 #include <iostream>
00036 #include <string>
00037 
00038 extern "C"
00039 {
00040 #include <jpeglib.h>
00041 }
00042 
00043 namespace claw
00044 {
00045   namespace graphic
00046   {
00051     class jpeg : public image
00052     {
00053     public:
00054       /*--------------------------------------------------------------------*/
00061       struct error_manager
00062       {
00064         struct jpeg_error_mgr pub;
00065 
00066         /* \brief For return to caller */
00067         jmp_buf setjmp_buffer;
00068 
00070         std::string error_string;
00071 
00072       }; // struct error_manager
00073 
00074       /*----------------------------------------------------------------------*/
00079       class reader
00080       {
00081         // classes that need to be accessible from jpeg callbacks.
00082       public:
00083         /*--------------------------------------------------------------------*/
00088         struct source_manager
00089         {
00090         public:
00091           source_manager( std::istream& is );
00092           ~source_manager();
00093 
00094           boolean fill_input_buffer();
00095           void skip_input_data(long num_bytes);
00096 
00097         public:
00099           struct jpeg_source_mgr pub;
00100 
00101         private:
00103           std::istream& m_input;
00104 
00106           const JOCTET* m_buffer;
00107 
00109           const unsigned int m_buffer_size;
00110 
00112           unsigned int m_stream_size;
00113 
00115           unsigned int m_stream_position;
00116 
00117         }; // struct source_manager
00118 
00119       private:
00120         /*--------------------------------------------------------------------*/
00124         class RGB_to_pixel32
00125         {
00126         public:
00127           rgba_pixel_8 operator()( const JSAMPLE* pixel ) const;
00128         }; // class RGB_to_pixel32
00129 
00130         /*--------------------------------------------------------------------*/
00134         class grayscale_to_pixel32
00135         {
00136         public:
00137           rgba_pixel_8 operator()( const JSAMPLE* pixel ) const;
00138         }; // class grayscale_to_pixel32
00139 
00140       public:
00141         reader( image& img );
00142         reader( image& img, std::istream& f );
00143 
00144         void load( std::istream& f );
00145 
00146       private:
00147         template<class Convert>
00148         void read_data( jpeg_decompress_struct& cinfo,
00149                         const Convert& pixel_convert );
00150 
00151         void read_from_file( std::istream& f );
00152         void decompress( std::istream& f, jpeg_decompress_struct& cinfo );
00153 
00154         void create_decompress_info( jpeg_decompress_struct& cinfo,
00155                                      source_manager& infile ) const;
00156       private:
00158         image& m_image;
00159 
00160       }; // class reader
00161 
00162       /*----------------------------------------------------------------------*/
00167       class writer
00168       {
00169       public:
00173         struct options
00174         {
00175         public:
00176           options();
00177           options( unsigned char compression_quality_, bool progressive_ );
00178 
00179         public:
00181           unsigned char quality;
00182 
00184           bool progressive;
00185 
00186         }; // struct options
00187 
00188         // classes that need to be accessible from jpeg callbacks.
00189 
00190         /*--------------------------------------------------------------------*/
00195         struct destination_manager
00196         {
00197         public:
00198           destination_manager( std::ostream& os );
00199           ~destination_manager();
00200 
00201           void flush();
00202           void term();
00203 
00204         public:
00206           struct jpeg_destination_mgr pub;
00207 
00208         private:
00210           std::ostream& m_output;
00211 
00213           JOCTET* m_buffer;
00214 
00216           const unsigned int m_buffer_size;
00217 
00218         }; // struct destination_manager
00219 
00220       public:
00221         writer( const image& img );
00222         writer( const image& img, std::ostream& f,
00223                 const options& opt = options() );
00224 
00225         void save( std::ostream& f, const options& opt = options() ) const;
00226 
00227       private:
00228         void set_options( jpeg_compress_struct& cinfo,
00229                           const options& opt ) const;
00230         void save_image( jpeg_compress_struct& cinfo ) const;
00231         
00232         void copy_pixel_line( JSAMPLE* data, unsigned int y ) const;
00233 
00234         void create_compress_info( jpeg_compress_struct& cinfo,
00235                                    destination_manager& outfile ) const;
00236 
00237       private:
00239         const image& m_image;
00240 
00243         static const unsigned int s_rgb_pixel_size;
00244 
00245       }; // class writer
00246 
00247     public:
00248       jpeg( unsigned int w, unsigned int h );
00249       jpeg( const image& that );
00250       jpeg( std::istream& f );
00251 
00252       void save( std::ostream& os,
00253                  const writer::options& opt = writer::options() ) const;
00254 
00255     }; // class jpeg
00256   } // namespace graphic
00257 } // namespace claw
00258 
00259 #include <claw/impl/jpeg_reader.tpp>
00260 
00261 #endif // __CLAW_JPEG_HPP__

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