| /* |
| 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_PNG_DYNAMIC_IO_H |
| #define GIL_PNG_DYNAMIC_IO_H |
| |
| /// \file |
| /// \brief Support for reading and writing PNG files |
| /// Requires libpng and zlib! |
| /// |
| /// \author Hailin Jin and Lubomir Bourdev \n |
| /// Adobe Systems Incorporated |
| /// \date 2005-2007 \n Last updated June 10, 2006 |
| // |
| // We are currently providing the following functions: |
| // template <typename Images> void png_read_image(const char*,any_image<Images>&) |
| // template <typename Images> void png_read_image(FILE*,any_image<Images>&,std::size_t) |
| // template <typename Views> void png_write_view(const char*,const any_image_view<View>&) |
| // template <typename Views> void png_write_view(FILE*,const any_image_view<View>&) |
| |
| |
| #include <string> |
| #include <stdio.h> |
| #include <boost/mpl/bool.hpp> |
| #include <boost/shared_ptr.hpp> |
| #include "../dynamic_image/dynamic_image_all.hpp" |
| #include "io_error.hpp" |
| #include "png_io.hpp" |
| #include "png_io_private.hpp" |
| #include "dynamic_io.hpp" |
| |
| namespace boost { namespace gil { |
| |
| namespace detail { |
| |
| struct png_write_is_supported { |
| template<typename View> struct apply |
| : public mpl::bool_<png_write_support<View>::is_supported> {}; |
| }; |
| |
| class png_writer_dynamic : public png_writer { |
| public: |
| png_writer_dynamic(FILE* file ) : png_writer(file) {} |
| png_writer_dynamic(const char* filename) : png_writer(filename){} |
| |
| template <typename Views> |
| void write_view(const any_image_view<Views>& runtime_view) { |
| dynamic_io_fnobj<png_write_is_supported, png_writer> op(this); |
| apply_operation(runtime_view,op); |
| } |
| }; |
| |
| class png_type_format_checker { |
| int _bit_depth; |
| int _color_type; |
| public: |
| png_type_format_checker(int bit_depth_in,int color_type_in) : |
| _bit_depth(bit_depth_in),_color_type(color_type_in) {} |
| template <typename Image> |
| bool apply() { |
| return png_read_support<typename Image::view_t>::bit_depth==_bit_depth && |
| png_read_support<typename Image::view_t>::color_type==_color_type; |
| } |
| }; |
| |
| struct png_read_is_supported { |
| template<typename View> struct apply |
| : public mpl::bool_<png_read_support<View>::is_supported> {}; |
| }; |
| |
| class png_reader_dynamic : public png_reader { |
| public: |
| png_reader_dynamic(FILE* file) : png_reader(file) {} |
| png_reader_dynamic(const char* filename) : png_reader(filename){} |
| |
| template <typename Images> |
| void read_image(any_image<Images>& im) { |
| png_uint_32 width, height; |
| int bit_depth, color_type, interlace_type; |
| png_get_IHDR(_png_ptr, _info_ptr, |
| &width, &height,&bit_depth,&color_type,&interlace_type, |
| int_p_NULL, int_p_NULL); |
| if (!construct_matched(im,png_type_format_checker(bit_depth,color_type))) { |
| io_error("png_reader_dynamic::read_image(): no matching image type between those of the given any_image and that of the file"); |
| } else { |
| im.recreate(width,height); |
| dynamic_io_fnobj<png_read_is_supported, png_reader> op(this); |
| apply_operation(view(im),op); |
| } |
| } |
| }; |
| |
| } // namespace detail |
| |
| /// \ingroup PNG_IO |
| /// \brief reads a PNG image into a run-time instantiated image |
| /// Opens the given png 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 png_read_image(const char* filename,any_image<Images>& im) { |
| detail::png_reader_dynamic m(filename); |
| m.read_image(im); |
| } |
| |
| /// \ingroup PNG_IO |
| /// \brief reads a PNG image into a run-time instantiated image |
| template <typename Images> |
| inline void png_read_image(const std::string& filename,any_image<Images>& im) { |
| png_read_image(filename.c_str(),im); |
| } |
| |
| /// \ingroup PNG_IO |
| /// \brief Saves the currently instantiated view to a png file specified by the given png 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 png_write_view(const char* filename,const any_image_view<Views>& runtime_view) { |
| detail::png_writer_dynamic m(filename); |
| m.write_view(runtime_view); |
| } |
| |
| /// \ingroup PNG_IO |
| /// \brief Saves the currently instantiated view to a png file specified by the given png image file name. |
| template <typename Views> |
| inline void png_write_view(const std::string& filename,const any_image_view<Views>& runtime_view) { |
| png_write_view(filename.c_str(),runtime_view); |
| } |
| |
| } } // namespace boost::gil |
| |
| #endif |