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// // Copyright 2008 Christian Henning // // Distributed under 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 // #ifndef BOOST_GIL_EXTENSION_IO_PNM_DETAIL_SUPPORTED_TYPES_HPP #define BOOST_GIL_EXTENSION_IO_PNM_DETAIL_SUPPORTED_TYPES_HPP #include <boost/gil/extension/io/pnm/tags.hpp> #include <boost/gil/channel.hpp> #include <boost/gil/color_base.hpp> #include <boost/gil/io/base.hpp> #include <type_traits> namespace boost { namespace gil { namespace detail { // Read Support template< pnm_image_type::type ASCII_Type , pnm_image_type::type Binary_Type > struct pnm_rw_support_base { static const pnm_image_type::type _asc_type = ASCII_Type; static const pnm_image_type::type _bin_type = Binary_Type; }; template< typename Channel , typename ColorSpace > struct pnm_read_support : read_support_false , pnm_rw_support_base< 0 , 0 > {}; template< typename BitField, bool Mutable > struct pnm_read_support< packed_dynamic_channel_reference< BitField , 1 , Mutable > , gray_t > : read_support_true , pnm_rw_support_base< pnm_image_type::mono_asc_t::value , pnm_image_type::mono_bin_t::value > {}; template<> struct pnm_read_support<uint8_t , gray_t > : read_support_true , pnm_rw_support_base< pnm_image_type::gray_asc_t::value , pnm_image_type::gray_bin_t::value > {}; template<> struct pnm_read_support<uint8_t , rgb_t > : read_support_true , pnm_rw_support_base< pnm_image_type::color_asc_t::value , pnm_image_type::color_bin_t::value > {}; // Write support template< typename Channel , typename ColorSpace > struct pnm_write_support : write_support_false {}; template< typename BitField, bool Mutable > struct pnm_write_support< packed_dynamic_channel_reference< BitField , 1 , Mutable > , gray_t > : write_support_true , pnm_rw_support_base< pnm_image_type::mono_asc_t::value , pnm_image_type::mono_bin_t::value > {}; template<> struct pnm_write_support<uint8_t , gray_t > : write_support_true , pnm_rw_support_base< pnm_image_type::gray_asc_t::value , pnm_image_type::gray_bin_t::value > {}; template<> struct pnm_write_support<uint8_t , rgb_t > : write_support_true , pnm_rw_support_base< pnm_image_type::color_asc_t::value , pnm_image_type::color_bin_t::value > {}; } // namespace detail template<typename Pixel> struct is_read_supported<Pixel, pnm_tag> : std::integral_constant < bool, detail::pnm_read_support < typename channel_type<Pixel>::type, typename color_space_type<Pixel>::type >::is_supported > { using parent_t = detail::pnm_read_support < typename channel_type<Pixel>::type, typename color_space_type<Pixel>::type >; static const pnm_image_type::type _asc_type = parent_t::_asc_type; static const pnm_image_type::type _bin_type = parent_t::_bin_type; }; template<typename Pixel> struct is_write_supported<Pixel, pnm_tag> : std::integral_constant < bool, detail::pnm_write_support < typename channel_type<Pixel>::type, typename color_space_type<Pixel>::type >::is_supported > {}; } // namespace gil } // namespace boost #endif
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