Generic Image Library : jpeg_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_JPEG_DYNAMIC_IO_H
00014 #define GIL_JPEG_DYNAMIC_IO_H
00015 
00023 
00024 #include <stdio.h>
00025 #include <string>
00026 #include <boost/mpl/bool.hpp>
00027 #include <boost/shared_ptr.hpp>
00028 #include "../dynamic_image/dynamic_image_all.hpp"
00029 #include "io_error.hpp"
00030 
00031 #include "jpeg_io.hpp"
00032 #include "jpeg_io_private.hpp"
00033 #include "dynamic_io.hpp"
00034 
00035 namespace boost { namespace gil {
00036 
00037 namespace detail {
00038 
00039 struct jpeg_write_is_supported {
00040     template<typename View> struct apply
00041         : public mpl::bool_<jpeg_write_support<View>::is_supported> {};
00042 };
00043 
00044 class jpeg_writer_dynamic : public jpeg_writer {
00045     int _quality;
00046 public:    
00047     jpeg_writer_dynamic(FILE* file,           int quality=100) : jpeg_writer(file)    , _quality(quality) {}
00048     jpeg_writer_dynamic(const char* filename, int quality=100) : jpeg_writer(filename), _quality(quality) {}
00049 
00050     template <typename Views>
00051     void write_view(const any_image_view<Views>& runtime_view) {
00052         dynamic_io_fnobj<jpeg_write_is_supported, jpeg_writer> op(this);
00053         apply_operation(runtime_view,op);
00054     }
00055 };
00056 
00057 class jpeg_type_format_checker {
00058     J_COLOR_SPACE _color_type;
00059 public:
00060     jpeg_type_format_checker(J_COLOR_SPACE color_type_in) :
00061         _color_type(color_type_in) {}
00062     template <typename Image>
00063     bool apply() {
00064         return jpeg_read_support<typename Image::view_t>::color_type==_color_type;
00065     }
00066 };
00067 
00068 struct jpeg_read_is_supported {
00069     template<typename View> struct apply
00070         : public mpl::bool_<jpeg_read_support<View>::is_supported> {};
00071 };
00072 
00073 class jpeg_reader_dynamic : public jpeg_reader {
00074 public:
00075     jpeg_reader_dynamic(FILE* file)           : jpeg_reader(file)    {}
00076     jpeg_reader_dynamic(const char* filename) : jpeg_reader(filename){}
00077         
00078     template <typename Images>
00079     void read_image(any_image<Images>& im) {
00080         if (!construct_matched(im,detail::jpeg_type_format_checker(_cinfo.out_color_space))) {
00081             io_error("jpeg_reader_dynamic::read_image(): no matching image type between those of the given any_image and that of the file");
00082         } else {
00083             im.recreate(get_dimensions());
00084             dynamic_io_fnobj<jpeg_read_is_supported, jpeg_reader> op(this);
00085             apply_operation(view(im),op);
00086         }
00087     }
00088 };
00089 
00090 } // namespace detail
00091 
00092 
00098 template <typename Images>
00099 inline void jpeg_read_image(const char* filename,any_image<Images>& im) {
00100     detail::jpeg_reader_dynamic m(filename);
00101     m.read_image(im);
00102 }
00103 
00106 template <typename Images>
00107 inline void jpeg_read_image(const std::string& filename,any_image<Images>& im) {
00108     jpeg_read_image(filename.c_str(),im);
00109 }
00110 
00115 template <typename Views>
00116 inline void jpeg_write_view(const char* filename,const any_image_view<Views>& runtime_view) {
00117     detail::jpeg_writer_dynamic m(filename);
00118     m.write_view(runtime_view);
00119 }
00120 
00123 template <typename Views>
00124 inline void jpeg_write_view(const std::string& filename,const any_image_view<Views>& runtime_view) {
00125     jpeg_write_view(filename.c_str(),runtime_view);
00126 }
00127 
00128 } }  // namespace boost::gil
00129 
00130 #endif
jpeg_dynamic_io.hpp
