//
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// Copyright 2008 Christian Henning
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//
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// Distributed under the Boost Software License, Version 1.0
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// 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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//
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#ifndef BOOST_GIL_EXTENSION_IO_PNM_DETAIL_SUPPORTED_TYPES_HPP
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#define BOOST_GIL_EXTENSION_IO_PNM_DETAIL_SUPPORTED_TYPES_HPP
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#include <boost/gil/extension/io/pnm/tags.hpp>
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#include <boost/gil/channel.hpp>
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#include <boost/gil/color_base.hpp>
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#include <boost/gil/io/base.hpp>
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#include <type_traits>
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namespace boost { namespace gil { namespace detail {
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// Read Support
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template< pnm_image_type::type ASCII_Type
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, pnm_image_type::type Binary_Type
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>
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struct pnm_rw_support_base
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{
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static const pnm_image_type::type _asc_type = ASCII_Type;
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static const pnm_image_type::type _bin_type = Binary_Type;
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};
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template< typename Channel
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, typename ColorSpace
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>
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struct pnm_read_support : read_support_false
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, pnm_rw_support_base< 0
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, 0
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> {};
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template< typename BitField, bool Mutable >
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struct pnm_read_support< packed_dynamic_channel_reference< BitField
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, 1
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, Mutable
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>
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, gray_t
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> : read_support_true
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, pnm_rw_support_base< pnm_image_type::mono_asc_t::value
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, pnm_image_type::mono_bin_t::value
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> {};
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template<>
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struct pnm_read_support<uint8_t
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, gray_t
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> : read_support_true
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, pnm_rw_support_base< pnm_image_type::gray_asc_t::value
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, pnm_image_type::gray_bin_t::value
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> {};
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template<>
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struct pnm_read_support<uint8_t
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, rgb_t
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> : read_support_true
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, pnm_rw_support_base< pnm_image_type::color_asc_t::value
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, pnm_image_type::color_bin_t::value
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> {};
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// Write support
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template< typename Channel
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, typename ColorSpace
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>
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struct pnm_write_support : write_support_false
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{};
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template< typename BitField, bool Mutable >
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struct pnm_write_support< packed_dynamic_channel_reference< BitField
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, 1
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, Mutable
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>
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, gray_t
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> : write_support_true
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, pnm_rw_support_base< pnm_image_type::mono_asc_t::value
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, pnm_image_type::mono_bin_t::value
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> {};
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template<>
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struct pnm_write_support<uint8_t
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, gray_t
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> : write_support_true
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, pnm_rw_support_base< pnm_image_type::gray_asc_t::value
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, pnm_image_type::gray_bin_t::value
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> {};
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template<>
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struct pnm_write_support<uint8_t
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, rgb_t
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> : write_support_true
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, pnm_rw_support_base< pnm_image_type::color_asc_t::value
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, pnm_image_type::color_bin_t::value
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> {};
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} // namespace detail
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template<typename Pixel>
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struct is_read_supported<Pixel, pnm_tag>
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: std::integral_constant
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<
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bool,
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detail::pnm_read_support
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<
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typename channel_type<Pixel>::type,
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typename color_space_type<Pixel>::type
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>::is_supported
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>
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{
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using parent_t = detail::pnm_read_support
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<
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typename channel_type<Pixel>::type,
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typename color_space_type<Pixel>::type
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>;
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static const pnm_image_type::type _asc_type = parent_t::_asc_type;
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static const pnm_image_type::type _bin_type = parent_t::_bin_type;
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};
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template<typename Pixel>
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struct is_write_supported<Pixel, pnm_tag>
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: std::integral_constant
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<
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bool,
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detail::pnm_write_support
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<
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typename channel_type<Pixel>::type,
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typename color_space_type<Pixel>::type
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>::is_supported
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>
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{};
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} // namespace gil
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} // namespace boost
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#endif
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