Generic Image Library : png_dynamic

00001 /*
00002     Copyright 2005-2007 Adobe Systems Incorporated
00003    
00004     Use, modification and distribution are subject to the Boost Software License,
00005     Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
00006     http://www.boost.org/LICENSE_1_0.txt).
00007 
00008     See http://opensource.adobe.com/gil for most recent version including documentation.
00009 */
00010 
00011 /*************************************************************************************************/
00012 
00013 #ifndef GIL_PNG_DYNAMIC_IO_H
00014 #define GIL_PNG_DYNAMIC_IO_H
00015 
00023 //
00024 // We are currently providing the following functions:
00025 // template <typename Images> void png_read_image(const char*,any_image<Images>&)
00026 // template <typename Images> void png_read_image(FILE*,any_image<Images>&,std::size_t)
00027 // template <typename Views> void png_write_view(const char*,const any_image_view<View>&)
00028 // template <typename Views> void png_write_view(FILE*,const any_image_view<View>&)
00029 
00030 
00031 #include <string>
00032 #include <stdio.h>
00033 #include <boost/mpl/bool.hpp>
00034 #include <boost/shared_ptr.hpp>
00035 #include "../dynamic_image/dynamic_image_all.hpp"
00036 #include "io_error.hpp"
00037 #include "png_io.hpp"
00038 #include "png_io_private.hpp"
00039 #include "dynamic_io.hpp"
00040 
00041 namespace boost { namespace gil {
00042 
00043 namespace detail {
00044 
00045 struct png_write_is_supported {
00046     template<typename View> struct apply
00047         : public mpl::bool_<png_write_support<View>::is_supported> {};
00048 };
00049 
00050 class png_writer_dynamic : public png_writer {
00051 public:
00052     png_writer_dynamic(FILE* file          ) : png_writer(file)    {}
00053     png_writer_dynamic(const char* filename) : png_writer(filename){}
00054 
00055     template <typename Views>
00056     void write_view(const any_image_view<Views>& runtime_view) {
00057         dynamic_io_fnobj<png_write_is_supported, png_writer> op(this);
00058         apply_operation(runtime_view,op);
00059     }
00060 };
00061 
00062 class png_type_format_checker {
00063     int _bit_depth;
00064     int _color_type;
00065 public:
00066     png_type_format_checker(int bit_depth_in,int color_type_in) :
00067         _bit_depth(bit_depth_in),_color_type(color_type_in) {}
00068     template <typename Image>
00069     bool apply() {
00070         return png_read_support<typename Image::view_t>::bit_depth==_bit_depth &&
00071             png_read_support<typename Image::view_t>::color_type==_color_type;
00072     }
00073 };
00074 
00075 struct png_read_is_supported {
00076     template<typename View> struct apply
00077         : public mpl::bool_<png_read_support<View>::is_supported> {};
00078 };
00079 
00080 class png_reader_dynamic : public png_reader {
00081 public:
00082     png_reader_dynamic(FILE* file)           : png_reader(file)    {}
00083     png_reader_dynamic(const char* filename) : png_reader(filename){}
00084     
00085     template <typename Images>
00086     void read_image(any_image<Images>& im) {
00087         png_uint_32 width, height;
00088         int bit_depth, color_type, interlace_type;
00089         png_get_IHDR(_png_ptr, _info_ptr,
00090                      &width, &height,&bit_depth,&color_type,&interlace_type,
00091                      int_p_NULL, int_p_NULL);
00092         if (!construct_matched(im,png_type_format_checker(bit_depth,color_type))) {
00093             io_error("png_reader_dynamic::read_image(): no matching image type between those of the given any_image and that of the file");
00094         } else {
00095             im.recreate(width,height);
00096             dynamic_io_fnobj<png_read_is_supported, png_reader> op(this);
00097             apply_operation(view(im),op);
00098         }
00099     }
00100 };
00101 
00102 } // namespace detail 
00103 
00109 template <typename Images>
00110 inline void png_read_image(const char* filename,any_image<Images>& im) {
00111     detail::png_reader_dynamic m(filename);
00112     m.read_image(im);
00113 }
00114 
00117 template <typename Images>
00118 inline void png_read_image(const std::string& filename,any_image<Images>& im) {
00119     png_read_image(filename.c_str(),im);
00120 }
00121 
00126 template <typename Views>
00127 inline void png_write_view(const char* filename,const any_image_view<Views>& runtime_view) {
00128     detail::png_writer_dynamic m(filename);
00129     m.write_view(runtime_view);
00130 }
00131 
00134 template <typename Views>
00135 inline void png_write_view(const std::string& filename,const any_image_view<Views>& runtime_view) {
00136     png_write_view(filename.c_str(),runtime_view);
00137 }
00138 
00139 } }  // namespace boost::gil
00140 
00141 #endif
png_dynamic_io.hpp
