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130 lines
4.5 KiB
130 lines
4.5 KiB
/* |
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Copyright 2005-2007 Adobe Systems Incorporated |
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Use, modification and distribution are subject to the Boost Software License, |
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Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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http://www.boost.org/LICENSE_1_0.txt). |
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See http://opensource.adobe.com/gil for most recent version including documentation. |
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*/ |
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/*************************************************************************************************/ |
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#ifndef GIL_JPEG_DYNAMIC_IO_H |
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#define GIL_JPEG_DYNAMIC_IO_H |
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/// \file |
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/// \brief Support for reading and writing JPEG files |
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/// Requires libjpeg |
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/// |
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/// \author Hailin Jin and Lubomir Bourdev \n |
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/// Adobe Systems Incorporated |
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/// \date 2005-2007 \n Last updated June 10, 2006 |
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#include <stdio.h> |
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#include <string> |
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#include <boost/mpl/bool.hpp> |
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#include <boost/shared_ptr.hpp> |
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#include "../dynamic_image/dynamic_image_all.hpp" |
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#include "io_error.hpp" |
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#include "jpeg_io.hpp" |
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#include "jpeg_io_private.hpp" |
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#include "dynamic_io.hpp" |
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namespace boost { namespace gil { |
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namespace detail { |
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struct jpeg_write_is_supported { |
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template<typename View> struct apply |
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: public mpl::bool_<jpeg_write_support<View>::is_supported> {}; |
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}; |
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class jpeg_writer_dynamic : public jpeg_writer { |
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int _quality; |
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public: |
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jpeg_writer_dynamic(FILE* file, int quality=100) : jpeg_writer(file) , _quality(quality) {} |
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jpeg_writer_dynamic(const char* filename, int quality=100) : jpeg_writer(filename), _quality(quality) {} |
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template <typename Views> |
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void write_view(const any_image_view<Views>& runtime_view) { |
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dynamic_io_fnobj<jpeg_write_is_supported, jpeg_writer> op(this); |
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apply_operation(runtime_view,op); |
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} |
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}; |
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class jpeg_type_format_checker { |
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J_COLOR_SPACE _color_type; |
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public: |
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jpeg_type_format_checker(J_COLOR_SPACE color_type_in) : |
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_color_type(color_type_in) {} |
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template <typename Image> |
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bool apply() { |
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return jpeg_read_support<typename Image::view_t>::color_type==_color_type; |
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} |
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}; |
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struct jpeg_read_is_supported { |
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template<typename View> struct apply |
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: public mpl::bool_<jpeg_read_support<View>::is_supported> {}; |
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}; |
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class jpeg_reader_dynamic : public jpeg_reader { |
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public: |
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jpeg_reader_dynamic(FILE* file) : jpeg_reader(file) {} |
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jpeg_reader_dynamic(const char* filename) : jpeg_reader(filename){} |
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template <typename Images> |
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void read_image(any_image<Images>& im) { |
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if (!construct_matched(im,detail::jpeg_type_format_checker(_cinfo.out_color_space))) { |
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io_error("jpeg_reader_dynamic::read_image(): no matching image type between those of the given any_image and that of the file"); |
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} else { |
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im.recreate(get_dimensions()); |
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dynamic_io_fnobj<jpeg_read_is_supported, jpeg_reader> op(this); |
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apply_operation(view(im),op); |
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} |
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} |
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}; |
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} // namespace detail |
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/// \ingroup JPEG_IO |
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/// \brief reads a JPEG image into a run-time instantiated image |
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/// 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 |
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/// and creates a new image of that type with the dimensions specified by the image file. |
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/// Throws std::ios_base::failure if none of the types in Images are compatible with the type on disk. |
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template <typename Images> |
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inline void jpeg_read_image(const char* filename,any_image<Images>& im) { |
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detail::jpeg_reader_dynamic m(filename); |
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m.read_image(im); |
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} |
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/// \ingroup JPEG_IO |
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/// \brief reads a JPEG image into a run-time instantiated image |
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template <typename Images> |
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inline void jpeg_read_image(const std::string& filename,any_image<Images>& im) { |
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jpeg_read_image(filename.c_str(),im); |
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} |
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/// \ingroup JPEG_IO |
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/// \brief Saves the currently instantiated view to a jpeg file specified by the given jpeg image file name. |
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/// Throws std::ios_base::failure if the currently instantiated view type is not supported for writing by the I/O extension |
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/// or if it fails to create the file. |
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template <typename Views> |
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inline void jpeg_write_view(const char* filename,const any_image_view<Views>& runtime_view) { |
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detail::jpeg_writer_dynamic m(filename); |
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m.write_view(runtime_view); |
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} |
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/// \ingroup JPEG_IO |
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/// \brief Saves the currently instantiated view to a jpeg file specified by the given jpeg image file name. |
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template <typename Views> |
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inline void jpeg_write_view(const std::string& filename,const any_image_view<Views>& runtime_view) { |
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jpeg_write_view(filename.c_str(),runtime_view); |
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} |
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} } // namespace boost::gil |
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#endif
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