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/*
Copyright 2005-2007 Adobe Systems Incorporated
Use, modification and distribution are subject to the Boost Software License,
Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt).
See http://opensource.adobe.com/gil for most recent version including documentation.
*/
/*************************************************************************************************/
#ifndef GIL_JPEG_IO_PRIVATE_H
#define GIL_JPEG_IO_PRIVATE_H
/// \file
/// \brief Internal support for reading and writing JPEG files
/// \author Hailin Jin and Lubomir Bourdev \n
/// Adobe Systems Incorporated
/// \date 2005-2007 \n Last updated September 24, 2006
#include <stdio.h>
#include <boost/static_assert.hpp>
#include <vector>
#include "../../gil_all.hpp"
#include "io_error.hpp"
#include <jpeglib.h>
namespace boost { namespace gil {
namespace detail {
// lbourdev: What is the advantage of having channel and colorspace together? Are there cases where they are interrelated?
template <typename Channel,typename ColorSpace>
struct jpeg_read_support_private {
BOOST_STATIC_CONSTANT(bool,is_supported=false);
BOOST_STATIC_CONSTANT(J_COLOR_SPACE,color_type=JCS_UNKNOWN);
};
template <>
struct jpeg_read_support_private<bits8,gray_t> {
BOOST_STATIC_ASSERT(BITS_IN_JSAMPLE==8);
BOOST_STATIC_CONSTANT(bool,is_supported=true);
BOOST_STATIC_CONSTANT(J_COLOR_SPACE,color_type=JCS_GRAYSCALE);
};
template <>
struct jpeg_read_support_private<bits8,rgb_t> {
BOOST_STATIC_ASSERT(BITS_IN_JSAMPLE==8);
BOOST_STATIC_CONSTANT(bool,is_supported=true);
BOOST_STATIC_CONSTANT(J_COLOR_SPACE,color_type=JCS_RGB);
};
template <>
struct jpeg_read_support_private<bits8,cmyk_t> {
BOOST_STATIC_ASSERT(BITS_IN_JSAMPLE==8);
BOOST_STATIC_CONSTANT(bool,is_supported=true);
BOOST_STATIC_CONSTANT(J_COLOR_SPACE,color_type=JCS_CMYK);
};
template <typename Channel,typename ColorSpace>
struct jpeg_write_support_private {
BOOST_STATIC_CONSTANT(bool,is_supported=false);
BOOST_STATIC_CONSTANT(J_COLOR_SPACE,color_type=JCS_UNKNOWN);
};
template <>
struct jpeg_write_support_private<bits8,gray_t> {
BOOST_STATIC_ASSERT(BITS_IN_JSAMPLE==8);
BOOST_STATIC_CONSTANT(bool,is_supported=true);
BOOST_STATIC_CONSTANT(J_COLOR_SPACE,color_type=JCS_GRAYSCALE);
};
template <>
struct jpeg_write_support_private<bits8,rgb_t> {
BOOST_STATIC_ASSERT(BITS_IN_JSAMPLE==8);
BOOST_STATIC_CONSTANT(bool,is_supported=true);
BOOST_STATIC_CONSTANT(J_COLOR_SPACE,color_type=JCS_RGB);
};
template <>
struct jpeg_write_support_private<bits8,cmyk_t> {
BOOST_STATIC_ASSERT(BITS_IN_JSAMPLE==8);
BOOST_STATIC_CONSTANT(bool,is_supported=true);
BOOST_STATIC_CONSTANT(J_COLOR_SPACE,color_type=JCS_CMYK);
};
class jpeg_reader : public file_mgr {
protected:
jpeg_decompress_struct _cinfo;
jpeg_error_mgr _jerr;
void init() {
_cinfo.err=jpeg_std_error(&_jerr);
jpeg_create_decompress(&_cinfo);
jpeg_stdio_src(&_cinfo,_fp.get());
jpeg_read_header(&_cinfo,TRUE);
}
public:
jpeg_reader(FILE* file) : file_mgr(file) { init(); }
jpeg_reader(const char* filename) : file_mgr(filename, "rb") { init(); }
~jpeg_reader() { jpeg_destroy_decompress(&_cinfo); }
template <typename View>
void apply(const View& view) {
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...
io_error_if(_cinfo.data_precision!=8,"jpeg_reader::apply(): this image file is not supported");
io_error_if(_cinfo.out_color_space!=jpeg_read_support_private<typename channel_type<View>::type,
typename color_space_type<View>::type>::color_type,
"jpeg_reader::apply(): input view type does not match the image file");
io_error_if(view.dimensions() != get_dimensions(), "jpeg_reader::apply(): input view dimensions do not match the image file");
std::vector<pixel<bits8,layout<typename color_space_type<View>::type> > > row(view.width());
JSAMPLE* row_address=(JSAMPLE*)&row.front();
for(int y=0;y<view.height();++y) {
io_error_if(jpeg_read_scanlines(&_cinfo,(JSAMPARRAY)&row_address,1)!=1,
"jpeg_reader::apply(): fail to read JPEG file");
std::copy(row.begin(),row.end(),view.row_begin(y));
}
jpeg_finish_decompress(&_cinfo);
}
template <typename Image>
void read_image(Image& im) {
im.recreate(get_dimensions());
apply(view(im));
}
point2<std::ptrdiff_t> get_dimensions() const {
return point2<std::ptrdiff_t>(_cinfo.image_width,_cinfo.image_height);
}
};
// This code will be simplified...
template <typename CC>
class jpeg_reader_color_convert : public jpeg_reader {
private:
CC _cc;
public:
jpeg_reader_color_convert(FILE* file,CC cc_in) : jpeg_reader(file),_cc(cc_in) {}
jpeg_reader_color_convert(FILE* file) : jpeg_reader(file) {}
jpeg_reader_color_convert(const char* filename,CC cc_in) : jpeg_reader(filename),_cc(cc_in) {}
jpeg_reader_color_convert(const char* filename) : jpeg_reader(filename) {}
template <typename View>
void apply(const View& view) {
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...
io_error_if(_cinfo.data_precision!=8,"jpeg_reader_color_covert::apply(): this image file is not supported");
io_error_if(view.dimensions() != get_dimensions(), "jpeg_reader_color_covert::apply(): input view dimensions don't match the image file");
switch (_cinfo.out_color_space) {
case JCS_GRAYSCALE: {
std::vector<gray8_pixel_t> row(view.width());
JSAMPLE* row_address=(JSAMPLE*)&row.front();
for(int y=0;y<view.height();++y) {
io_error_if(jpeg_read_scanlines(&_cinfo,(JSAMPARRAY)&row_address,1)!=1,
"jpeg_reader_color_covert::apply(): fail to read JPEG file");
std::transform(row.begin(),row.end(),view.row_begin(y),color_convert_deref_fn<gray8_ref_t, typename View::value_type,CC>(_cc));
}
break;
}
case JCS_RGB: {
std::vector<rgb8_pixel_t> row(view.width());
JSAMPLE* row_address=(JSAMPLE*)&row.front();
for(int y=0;y<view.height();++y) {
io_error_if(jpeg_read_scanlines(&_cinfo,(JSAMPARRAY)&row_address,1)!=1,
"jpeg_reader_color_covert::apply(): fail to read JPEG file");
std::transform(row.begin(),row.end(),view.row_begin(y),color_convert_deref_fn<rgb8_ref_t, typename View::value_type,CC>(_cc));
}
break;
}
case JCS_CMYK: {
std::vector<cmyk8_pixel_t> row(view.width());
JSAMPLE* row_address=(JSAMPLE*)&row.front();
for(int y=0;y<view.height();++y) {
io_error_if(jpeg_read_scanlines(&_cinfo,(JSAMPARRAY)&row_address,1)!=1,
"jpeg_reader_color_covert::apply(): fail to read JPEG file");
std::transform(row.begin(),row.end(),view.row_begin(y),color_convert_deref_fn<cmyk8_ref_t, typename View::value_type,CC>(_cc));
}
break;
}
default:
io_error("jpeg_reader_color_covert::apply(): unknown color type");
}
jpeg_finish_decompress(&_cinfo);
}
template <typename Image>
void read_image(Image& im) {
im.recreate(get_dimensions());
apply(view(im));
}
};
class jpeg_writer : public file_mgr {
jpeg_compress_struct _cinfo;
jpeg_error_mgr _jerr;
void init() {
_cinfo.err=jpeg_std_error(&_jerr);
jpeg_create_compress(&_cinfo);
jpeg_stdio_dest(&_cinfo,_fp.get());
}
public:
jpeg_writer(FILE* file) : file_mgr(file) { init(); }
jpeg_writer(const char* filename) : file_mgr(filename, "wb") { init(); }
~jpeg_writer() { jpeg_destroy_compress(&_cinfo); }
template <typename View>
void apply(const View& view,int quality=100) {
_cinfo.image_width = (JDIMENSION)view.width();
_cinfo.image_height = (JDIMENSION)view.height();
_cinfo.input_components=num_channels<View>::value;
_cinfo.in_color_space = jpeg_write_support_private<typename channel_type<View>::type,
typename color_space_type<View>::type>::color_type;
jpeg_set_defaults(&_cinfo);
jpeg_set_quality(&_cinfo, quality, TRUE);
jpeg_start_compress(&_cinfo, TRUE);
std::vector<pixel<bits8,layout<typename color_space_type<View>::type> > > row(view.width());
JSAMPLE* row_address=(JSAMPLE*)&row.front();
for (int y=0;y<view.height(); ++y) {
std::copy(view.row_begin(y),view.row_end(y),row.begin());
io_error_if(jpeg_write_scanlines(&_cinfo,(JSAMPARRAY)&row_address,1) != 1,
"jpeg_writer::apply(): fail to write file");
}
jpeg_finish_compress(&_cinfo);
}
};
} // namespace detail
} } // namespace boost::gil
#endif