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# jpeg_io_private.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_IO_PRIVATE_H
    00014 #define GIL_JPEG_IO_PRIVATE_H
    00015
    00021
    00022 #include <stdio.h>
    00023 #include <boost/static_assert.hpp>
    00024 #include <vector>
    00025 #include "../../gil_all.hpp"
    00026 #include "io_error.hpp"
    00027 #include <jpeglib.h>
    00028
    00029 namespace boost { namespace gil {
    00030
    00031 namespace detail {
    00032
    00033 // lbourdev: What is the advantage of having channel and colorspace together? Are there cases where they are interrelated?
    00034
    00035 template <typename Channel,typename ColorSpace>
    00036 struct jpeg_read_support_private {
    00037     BOOST_STATIC_CONSTANT(bool,is_supported=false);
    00038     BOOST_STATIC_CONSTANT(J_COLOR_SPACE,color_type=JCS_UNKNOWN);
    00039 };
    00040 template <>
    00041 struct jpeg_read_support_private<bits8,gray_t> {
    00042     BOOST_STATIC_ASSERT(BITS_IN_JSAMPLE==8);
    00043     BOOST_STATIC_CONSTANT(bool,is_supported=true);
    00044     BOOST_STATIC_CONSTANT(J_COLOR_SPACE,color_type=JCS_GRAYSCALE);
    00045 };
    00046 template <>
    00047 struct jpeg_read_support_private<bits8,rgb_t> {
    00048     BOOST_STATIC_ASSERT(BITS_IN_JSAMPLE==8);
    00049     BOOST_STATIC_CONSTANT(bool,is_supported=true);
    00050     BOOST_STATIC_CONSTANT(J_COLOR_SPACE,color_type=JCS_RGB);
    00051 };
    00052 template <>
    00053 struct jpeg_read_support_private<bits8,cmyk_t> {
    00054     BOOST_STATIC_ASSERT(BITS_IN_JSAMPLE==8);
    00055     BOOST_STATIC_CONSTANT(bool,is_supported=true);
    00056     BOOST_STATIC_CONSTANT(J_COLOR_SPACE,color_type=JCS_CMYK);
    00057 };
    00058 template <typename Channel,typename ColorSpace>
    00059 struct jpeg_write_support_private {
    00060     BOOST_STATIC_CONSTANT(bool,is_supported=false);
    00061     BOOST_STATIC_CONSTANT(J_COLOR_SPACE,color_type=JCS_UNKNOWN);
    00062 };
    00063 template <>
    00064 struct jpeg_write_support_private<bits8,gray_t> {
    00065     BOOST_STATIC_ASSERT(BITS_IN_JSAMPLE==8);
    00066     BOOST_STATIC_CONSTANT(bool,is_supported=true);
    00067     BOOST_STATIC_CONSTANT(J_COLOR_SPACE,color_type=JCS_GRAYSCALE);
    00068 };
    00069 template <>
    00070 struct jpeg_write_support_private<bits8,rgb_t> {
    00071     BOOST_STATIC_ASSERT(BITS_IN_JSAMPLE==8);
    00072     BOOST_STATIC_CONSTANT(bool,is_supported=true);
    00073     BOOST_STATIC_CONSTANT(J_COLOR_SPACE,color_type=JCS_RGB);
    00074 };
    00075 template <>
    00076 struct jpeg_write_support_private<bits8,cmyk_t> {
    00077     BOOST_STATIC_ASSERT(BITS_IN_JSAMPLE==8);
    00078     BOOST_STATIC_CONSTANT(bool,is_supported=true);
    00079     BOOST_STATIC_CONSTANT(J_COLOR_SPACE,color_type=JCS_CMYK);
    00080 };
    00081
    00082
    00083 class jpeg_reader : public file_mgr {
    00084 protected:
    00085     jpeg_decompress_struct  _cinfo;
    00086     jpeg_error_mgr          _jerr;
    00087
    00088     void init() {
    00089         _cinfo.err=jpeg_std_error(&_jerr);
    00090         jpeg_create_decompress(&_cinfo);
    00091         jpeg_stdio_src(&_cinfo,_fp.get());
    00092         jpeg_read_header(&_cinfo,TRUE);
    00093     }
    00094 public:
    00095     jpeg_reader(FILE* file)           : file_mgr(file)           { init(); }
    00096     jpeg_reader(const char* filename) : file_mgr(filename, "rb") { init(); }
    00097
    00098     ~jpeg_reader() { jpeg_destroy_decompress(&_cinfo); }
    00099
    00100     template <typename View>
    00101     void apply(const View& view) {
    00102         jpeg_start_decompress(&_cinfo);    // lbourdev: Can this return an error? You need to check and throw. Check all other library methods that can return an error state...
    00103         io_error_if(_cinfo.data_precision!=8,"jpeg_reader::apply(): this image file is not supported");
    00104         io_error_if(_cinfo.out_color_space!=jpeg_read_support_private<typename channel_type<View>::type,
    00105                                                                       typename color_space_type<View>::type>::color_type,
    00106                     "jpeg_reader::apply(): input view type does not match the image file");
    00107         io_error_if(view.dimensions() != get_dimensions(), "jpeg_reader::apply(): input view dimensions do not match the image file");
    00108         std::vector<pixel<bits8,layout<typename color_space_type<View>::type> > > row(view.width());
    00109         JSAMPLE* row_address=(JSAMPLE*)&row.front();
    00110         for(int y=0;y<view.height();++y) {
    00111             io_error_if(jpeg_read_scanlines(&_cinfo,(JSAMPARRAY)&row_address,1)!=1,
    00112                         "jpeg_reader::apply(): fail to read JPEG file");
    00113             std::copy(row.begin(),row.end(),view.row_begin(y));
    00114         }
    00115         jpeg_finish_decompress(&_cinfo);
    00116     }
    00117
    00118     template <typename Image>
    00119     void read_image(Image& im) {
    00120         im.recreate(get_dimensions());
    00121         apply(view(im));
    00122     }
    00123
    00124     point2<std::ptrdiff_t> get_dimensions() const {
    00125         return point2<std::ptrdiff_t>(_cinfo.image_width,_cinfo.image_height);
    00126     }
    00127 };
    00128
    00129 // This code will be simplified...
    00130 template <typename CC>
    00131 class jpeg_reader_color_convert : public jpeg_reader {
    00132 private:
    00133     CC _cc;
    00134 public:
    00135     jpeg_reader_color_convert(FILE* file,CC cc_in)           : jpeg_reader(file),_cc(cc_in) {}
    00136     jpeg_reader_color_convert(FILE* file)           : jpeg_reader(file) {}
    00137     jpeg_reader_color_convert(const char* filename,CC cc_in) : jpeg_reader(filename),_cc(cc_in) {}
    00138     jpeg_reader_color_convert(const char* filename) : jpeg_reader(filename) {}
    00139     template <typename View>
    00140     void apply(const View& view) {
    00141         jpeg_start_decompress(&_cinfo);    // lbourdev: Can this return an error? You need to check and throw. Check all other library methods that can return an error state...
    00142         io_error_if(_cinfo.data_precision!=8,"jpeg_reader_color_covert::apply(): this image file is not supported");
    00143         io_error_if(view.dimensions() != get_dimensions(), "jpeg_reader_color_covert::apply(): input view dimensions don't match the image file");
    00144         switch (_cinfo.out_color_space) {
    00145         case JCS_GRAYSCALE: {
    00146             std::vector<gray8_pixel_t> row(view.width());
    00147             JSAMPLE* row_address=(JSAMPLE*)&row.front();
    00148             for(int y=0;y<view.height();++y) {
    00149                 io_error_if(jpeg_read_scanlines(&_cinfo,(JSAMPARRAY)&row_address,1)!=1,
    00150                             "jpeg_reader_color_covert::apply(): fail to read JPEG file");
    00151                 std::transform(row.begin(),row.end(),view.row_begin(y),color_convert_deref_fn<gray8_ref_t, typename View::value_type,CC>(_cc));
    00152             }
    00153             break;
    00154         }
    00155         case JCS_RGB: {
    00156             std::vector<rgb8_pixel_t> row(view.width());
    00157             JSAMPLE* row_address=(JSAMPLE*)&row.front();
    00158             for(int y=0;y<view.height();++y) {
    00159                 io_error_if(jpeg_read_scanlines(&_cinfo,(JSAMPARRAY)&row_address,1)!=1,
    00160                             "jpeg_reader_color_covert::apply(): fail to read JPEG file");
    00161                 std::transform(row.begin(),row.end(),view.row_begin(y),color_convert_deref_fn<rgb8_ref_t, typename View::value_type,CC>(_cc));
    00162             }
    00163             break;
    00164         }
    00165         case JCS_CMYK: {
    00166             std::vector<cmyk8_pixel_t> row(view.width());
    00167             JSAMPLE* row_address=(JSAMPLE*)&row.front();
    00168             for(int y=0;y<view.height();++y) {
    00169                 io_error_if(jpeg_read_scanlines(&_cinfo,(JSAMPARRAY)&row_address,1)!=1,
    00170                             "jpeg_reader_color_covert::apply(): fail to read JPEG file");
    00171                 std::transform(row.begin(),row.end(),view.row_begin(y),color_convert_deref_fn<cmyk8_ref_t, typename View::value_type,CC>(_cc));
    00172             }
    00173             break;
    00174         }
    00175         default:
    00176             io_error("jpeg_reader_color_covert::apply(): unknown color type");
    00177         }
    00178         jpeg_finish_decompress(&_cinfo);
    00179     }
    00180     template <typename Image>
    00181     void read_image(Image& im) {
    00182         im.recreate(get_dimensions());
    00183         apply(view(im));
    00184     }
    00185 };
    00186
    00187 class jpeg_writer : public file_mgr {
    00188     jpeg_compress_struct _cinfo;
    00189     jpeg_error_mgr _jerr;
    00190
    00191     void init() {
    00192         _cinfo.err=jpeg_std_error(&_jerr);
    00193         jpeg_create_compress(&_cinfo);
    00194         jpeg_stdio_dest(&_cinfo,_fp.get());
    00195     }
    00196 public:
    00197     jpeg_writer(FILE* file)           : file_mgr(file)           { init(); }
    00198     jpeg_writer(const char* filename) : file_mgr(filename, "wb") { init(); }
    00199     ~jpeg_writer() { jpeg_destroy_compress(&_cinfo); }
    00200
    00201     template <typename View>
    00202     void apply(const View& view,int quality=100) {
    00203         _cinfo.image_width  = (JDIMENSION)view.width();
    00204         _cinfo.image_height = (JDIMENSION)view.height();
    00205         _cinfo.input_components=num_channels<View>::value;
    00206         _cinfo.in_color_space = jpeg_write_support_private<typename channel_type<View>::type,
    00207                                                            typename color_space_type<View>::type>::color_type;
    00208         jpeg_set_defaults(&_cinfo);
    00209         jpeg_set_quality(&_cinfo, quality, TRUE);
    00210         jpeg_start_compress(&_cinfo, TRUE);
    00211         std::vector<pixel<bits8,layout<typename color_space_type<View>::type> > > row(view.width());
    00212         JSAMPLE* row_address=(JSAMPLE*)&row.front();
    00213         for (int y=0;y<view.height(); ++y) {
    00214             std::copy(view.row_begin(y),view.row_end(y),row.begin());
    00215             io_error_if(jpeg_write_scanlines(&_cinfo,(JSAMPARRAY)&row_address,1) != 1,
    00216                         "jpeg_writer::apply(): fail to write file");
    00217         }
    00218         jpeg_finish_compress(&_cinfo);
    00219     }
    00220 };
    00221
    00222 } // namespace detail
    00223
    00224 } }  // namespace boost::gil
    00225
    00226 #endif