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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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