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# jpeg_dynamic_io.hpp

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    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