boost/gil/extension/io/jpeg_dynamic_io.hpp
/*
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_DYNAMIC_IO_H
#define GIL_JPEG_DYNAMIC_IO_H
/// \file
/// \brief Support for reading and writing JPEG files
/// Requires libjpeg
///
/// \author Hailin Jin and Lubomir Bourdev \n
/// Adobe Systems Incorporated
/// \date 2005-2007 \n Last updated June 10, 2006
#include <stdio.h>
#include <string>
#include <boost/mpl/bool.hpp>
#include <boost/shared_ptr.hpp>
#include "../dynamic_image/dynamic_image_all.hpp"
#include "io_error.hpp"
#include "jpeg_io.hpp"
#include "jpeg_io_private.hpp"
#include "dynamic_io.hpp"
namespace boost { namespace gil {
namespace detail {
struct jpeg_write_is_supported {
template<typename View> struct apply
: public mpl::bool_<jpeg_write_support<View>::is_supported> {};
};
class jpeg_writer_dynamic : public jpeg_writer {
int _quality;
public:
jpeg_writer_dynamic(FILE* file, int quality=100) : jpeg_writer(file) , _quality(quality) {}
jpeg_writer_dynamic(const char* filename, int quality=100) : jpeg_writer(filename), _quality(quality) {}
template <typename Views>
void write_view(const any_image_view<Views>& runtime_view) {
dynamic_io_fnobj<jpeg_write_is_supported, jpeg_writer> op(this);
apply_operation(runtime_view,op);
}
};
class jpeg_type_format_checker {
J_COLOR_SPACE _color_type;
public:
jpeg_type_format_checker(J_COLOR_SPACE color_type_in) :
_color_type(color_type_in) {}
template <typename Image>
bool apply() {
return jpeg_read_support<typename Image::view_t>::color_type==_color_type;
}
};
struct jpeg_read_is_supported {
template<typename View> struct apply
: public mpl::bool_<jpeg_read_support<View>::is_supported> {};
};
class jpeg_reader_dynamic : public jpeg_reader {
public:
jpeg_reader_dynamic(FILE* file) : jpeg_reader(file) {}
jpeg_reader_dynamic(const char* filename) : jpeg_reader(filename){}
template <typename Images>
void read_image(any_image<Images>& im) {
if (!construct_matched(im,detail::jpeg_type_format_checker(_cinfo.out_color_space))) {
io_error("jpeg_reader_dynamic::read_image(): no matching image type between those of the given any_image and that of the file");
} else {
im.recreate(get_dimensions());
dynamic_io_fnobj<jpeg_read_is_supported, jpeg_reader> op(this);
apply_operation(view(im),op);
}
}
};
} // namespace detail
/// \ingroup JPEG_IO
/// \brief reads a JPEG image into a run-time instantiated image
/// Opens the given JPEG file name, selects the first type in Images whose color space and channel are compatible to those of the image file
/// and creates a new image of that type with the dimensions specified by the image file.
/// Throws std::ios_base::failure if none of the types in Images are compatible with the type on disk.
template <typename Images>
inline void jpeg_read_image(const char* filename,any_image<Images>& im) {
detail::jpeg_reader_dynamic m(filename);
m.read_image(im);
}
/// \ingroup JPEG_IO
/// \brief reads a JPEG image into a run-time instantiated image
template <typename Images>
inline void jpeg_read_image(const std::string& filename,any_image<Images>& im) {
jpeg_read_image(filename.c_str(),im);
}
/// \ingroup JPEG_IO
/// \brief Saves the currently instantiated view to a jpeg file specified by the given jpeg image file name.
/// Throws std::ios_base::failure if the currently instantiated view type is not supported for writing by the I/O extension
/// or if it fails to create the file.
template <typename Views>
inline void jpeg_write_view(const char* filename,const any_image_view<Views>& runtime_view) {
detail::jpeg_writer_dynamic m(filename);
m.write_view(runtime_view);
}
/// \ingroup JPEG_IO
/// \brief Saves the currently instantiated view to a jpeg file specified by the given jpeg image file name.
template <typename Views>
inline void jpeg_write_view(const std::string& filename,const any_image_view<Views>& runtime_view) {
jpeg_write_view(filename.c_str(),runtime_view);
}
} } // namespace boost::gil
#endif
