• Main Page
  • Related Pages
  • Namespaces
  • Classes
  • Files
  • Directories
  • File List
  • File Members

png.hpp

Go to the documentation of this file.
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_PNG_HPP__
00031 #define __CLAW_PNG_HPP__
00032 
00033 #include <claw/image.hpp>
00034 #include <png.h>
00035 #include <setjmp.h>
00036 #include <iostream>
00037 #include <string>
00038 
00039 namespace claw
00040 {
00041   namespace graphic
00042   {
00047     class png : public image
00048     {
00049     public:
00050       /*----------------------------------------------------------------------*/
00055       class reader
00056       {
00057         // classes that need to be accessible from png callbacks.
00058       public:
00059         /*--------------------------------------------------------------------*/
00064         struct source_manager
00065         {
00066         public:
00067           source_manager( std::istream& is );
00068 
00069           void read( png_bytep data, png_size_t length );
00070 
00071         private:
00073           std::istream& m_input;
00074 
00075         }; // struct source_manager
00076 
00077       public:
00078         reader( image& img );
00079         reader( image& img, std::istream& f );
00080 
00081         void load( std::istream& f );
00082 
00083       private:
00084         void read_from_file( std::istream& f );
00085         void check_if_png( png_structp png_ptr, std::istream& f ) const;
00086 
00087         void read_image( png_structp png_ptr, png_infop info_ptr );
00088         void read_sequential_image( png_structp png_ptr, png_infop info_ptr );
00089         void read_interlaced_image( png_structp png_ptr, png_infop info_ptr,
00090                                     unsigned int passes );
00091 
00092         void copy_pixel_line( png_bytep data, unsigned int y );
00093 
00094         void create_read_structures( png_structp& png_ptr,
00095                                      png_infop& info_ptr ) const;
00096 
00097 
00098       private:
00100         image& m_image;
00101 
00104         static const unsigned int s_rgba_pixel_size;
00105 
00106       }; // class reader
00107 
00108       /*----------------------------------------------------------------------*/
00113       class writer
00114       {
00115       public:
00119         struct options
00120         {
00121         public:
00123           enum compression_level
00124             {
00125               no_compression = Z_NO_COMPRESSION,
00126               best_speed = Z_BEST_SPEED,
00127               best_compression = Z_BEST_COMPRESSION,
00128               default_compression = Z_DEFAULT_COMPRESSION
00129             }; // enum compression_level
00130 
00132           enum interlace_type
00133             {
00135               none = PNG_INTERLACE_NONE,
00136 
00139               adam7 = PNG_INTERLACE_ADAM7
00140             }; // enum interlace_type
00141 
00142         public:
00143           options();
00144           options( compression_level compression_level_,
00145                    interlace_type interlace_ );
00146 
00147         public:
00149           compression_level compression;
00150 
00152           interlace_type interlace;
00153 
00154         }; // struct options
00155 
00156         // classes that need to be accessible from png callbacks.
00157 
00158         /*--------------------------------------------------------------------*/
00163         struct target_manager
00164         {
00165         public:
00166           target_manager( std::ostream& os );
00167 
00168           void write( png_bytep data, png_size_t length );
00169           void flush();
00170 
00171         private:
00173           std::ostream& m_output;
00174 
00175         }; // struct target_manager
00176 
00177       public:
00178         writer( const image& img );
00179         writer( const image& img, std::ostream& f,
00180                 const options& opt = options() );
00181 
00182         void save( std::ostream& f, const options& opt = options() ) const;
00183 
00184       private:
00185         void set_options( png_structp png_ptr, png_infop info_ptr,
00186                           const options& opt ) const;
00187         void save_image( png_structp png_ptr, png_infop info_ptr ) const;
00188         
00189         void copy_pixel_line( png_bytep data, unsigned int y ) const;
00190 
00191         void create_write_structures( png_structp& png_ptr,
00192                                       png_infop& info_ptr ) const;
00193 
00194 
00195       private:
00197         const image& m_image;
00198 
00201         static const unsigned int s_rgba_pixel_size;
00202 
00203       }; // class writer
00204 
00205     public:
00206       png( unsigned int w, unsigned int h );
00207       png( const image& that );
00208       png( std::istream& f );
00209 
00210       void save( std::ostream& os,
00211                  const writer::options& opt = writer::options() ) const;
00212 
00213     }; // class png
00214   } // namespace graphic
00215 } // namespace claw
00216 
00217 #endif // __CLAW_PNG_HPP__

Generated on Thu Sep 30 2010 for CLAW Library (a C++ Library Absolutely Wonderful) by  doxygen 1.7.1