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- //
- // Copyright 2007-2008 Christian Henning, Andreas Pokorny, Lubomir Bourdev
- //
- // 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_PNG_DETAIL_SUPPORTED_TYPES_HPP
- #define BOOST_GIL_EXTENSION_IO_PNG_DETAIL_SUPPORTED_TYPES_HPP
- #include <boost/gil/extension/io/png/tags.hpp>
- #ifdef BOOST_GIL_IO_ENABLE_GRAY_ALPHA
- #include <boost/gil/extension/toolbox/color_spaces/gray_alpha.hpp>
- #endif // BOOST_GIL_IO_ENABLE_GRAY_ALPHA
- #include <cstddef>
- #include <type_traits>
- namespace boost { namespace gil { namespace detail {
- static const size_t PNG_BYTES_TO_CHECK = 4;
- // Read support
- template< png_bitdepth::type BitDepth
- , png_color_type::type ColorType
- >
- struct png_rw_support_base
- {
- static const png_bitdepth::type _bit_depth = BitDepth;
- static const png_color_type::type _color_type = ColorType;
- };
- template< typename Channel
- , typename ColorSpace
- >
- struct png_read_support : read_support_false
- , png_rw_support_base< 1
- , PNG_COLOR_TYPE_GRAY
- > {};
- template< typename BitField
- , bool Mutable
- >
- struct png_read_support< packed_dynamic_channel_reference< BitField
- , 1
- , Mutable
- >
- , gray_t
- > : read_support_true
- , png_rw_support_base< 1
- , PNG_COLOR_TYPE_GRAY
- > {};
- template< typename BitField
- , bool Mutable
- >
- struct png_read_support< packed_dynamic_channel_reference< BitField
- , 2
- , Mutable
- >
- , gray_t
- > : read_support_true
- , png_rw_support_base< 2
- , PNG_COLOR_TYPE_GRAY
- > {};
- template< typename BitField
- , bool Mutable
- >
- struct png_read_support< packed_dynamic_channel_reference< BitField
- , 4
- , Mutable
- >
- , gray_t
- > : read_support_true
- , png_rw_support_base< 4
- , PNG_COLOR_TYPE_GRAY
- > {};
- template<>
- struct png_read_support<uint8_t
- , gray_t
- > : read_support_true
- , png_rw_support_base< 8
- , PNG_COLOR_TYPE_GRAY
- > {};
- #ifdef BOOST_GIL_IO_ENABLE_GRAY_ALPHA
- template<>
- struct png_read_support<uint8_t
- , gray_alpha_t
- > : read_support_true
- , png_rw_support_base< 8
- , PNG_COLOR_TYPE_GA
- > {};
- #endif // BOOST_GIL_IO_ENABLE_GRAY_ALPHA
- template<>
- struct png_read_support<uint8_t
- , rgb_t
- > : read_support_true
- , png_rw_support_base< 8
- , PNG_COLOR_TYPE_RGB
- > {};
- template<>
- struct png_read_support<uint8_t
- , rgba_t
- > : read_support_true
- , png_rw_support_base< 8
- , PNG_COLOR_TYPE_RGBA
- > {};
- template<>
- struct png_read_support<uint16_t
- , gray_t
- > : read_support_true
- , png_rw_support_base< 16
- , PNG_COLOR_TYPE_GRAY
- > {};
- template<>
- struct png_read_support<uint16_t
- , rgb_t
- > : read_support_true
- , png_rw_support_base< 16
- , PNG_COLOR_TYPE_RGB
- > {};
- template<>
- struct png_read_support<uint16_t
- , rgba_t
- > : read_support_true
- , png_rw_support_base< 16
- , PNG_COLOR_TYPE_RGBA
- > {};
- #ifdef BOOST_GIL_IO_ENABLE_GRAY_ALPHA
- template<>
- struct png_read_support<uint16_t
- , gray_alpha_t
- > : read_support_true
- , png_rw_support_base< 16
- , PNG_COLOR_TYPE_GA
- > {};
- #endif // BOOST_GIL_IO_ENABLE_GRAY_ALPHA
- // Write support
- template< typename Channel
- , typename ColorSpace
- >
- struct png_write_support : write_support_false
- , png_rw_support_base< 1
- , PNG_COLOR_TYPE_GRAY
- > {};
- template< typename BitField
- , bool Mutable
- >
- struct png_write_support< packed_dynamic_channel_reference< BitField
- , 1
- , Mutable
- >
- , gray_t
- > : write_support_true
- , png_rw_support_base< 1
- , PNG_COLOR_TYPE_GRAY
- >
- {};
- template< typename BitField
- , bool Mutable
- >
- struct png_write_support< packed_dynamic_channel_reference< BitField
- , 1
- , Mutable
- > const
- , gray_t
- > : write_support_true
- , png_rw_support_base< 1
- , PNG_COLOR_TYPE_GRAY
- >
- {};
- template< typename BitField
- , bool Mutable
- >
- struct png_write_support< packed_dynamic_channel_reference< BitField
- , 2
- , Mutable
- >
- , gray_t
- > : write_support_true
- , png_rw_support_base< 2
- , PNG_COLOR_TYPE_GRAY
- >
- {};
- template< typename BitField
- , bool Mutable
- >
- struct png_write_support< packed_dynamic_channel_reference< BitField
- , 2
- , Mutable
- > const
- , gray_t
- > : write_support_true
- , png_rw_support_base< 2
- , PNG_COLOR_TYPE_GRAY
- >
- {};
- template< typename BitField
- , bool Mutable
- >
- struct png_write_support< packed_dynamic_channel_reference< BitField
- , 4
- , Mutable
- >
- , gray_t
- > : write_support_true
- , png_rw_support_base< 4
- , PNG_COLOR_TYPE_GRAY
- >
- {};
- template< typename BitField
- , bool Mutable
- >
- struct png_write_support< packed_dynamic_channel_reference< BitField
- , 4
- , Mutable
- > const
- , gray_t
- > : write_support_true
- , png_rw_support_base< 4
- , PNG_COLOR_TYPE_GRAY
- >
- {};
- template<>
- struct png_write_support<uint8_t
- , gray_t
- > : write_support_true
- , png_rw_support_base< 8
- , PNG_COLOR_TYPE_GRAY
- >
- {};
- #ifdef BOOST_GIL_IO_ENABLE_GRAY_ALPHA
- template<>
- struct png_write_support<uint8_t
- , gray_alpha_t
- > : write_support_true
- , png_rw_support_base< 8
- , PNG_COLOR_TYPE_GA
- >
- {};
- #endif // BOOST_GIL_IO_ENABLE_GRAY_ALPHA
- template<>
- struct png_write_support<uint8_t
- , rgb_t
- > : write_support_true
- , png_rw_support_base< 8
- , PNG_COLOR_TYPE_RGB
- >
- {};
- template<>
- struct png_write_support<uint8_t
- , rgba_t
- > : write_support_true
- , png_rw_support_base< 8
- , PNG_COLOR_TYPE_RGBA
- >
- {};
- template<>
- struct png_write_support<uint16_t
- , gray_t
- > : write_support_true
- , png_rw_support_base< 16
- , PNG_COLOR_TYPE_GRAY
- >
- {};
- template<>
- struct png_write_support<uint16_t
- , rgb_t
- > : write_support_true
- , png_rw_support_base< 16
- , PNG_COLOR_TYPE_RGB
- >
- {};
- template<>
- struct png_write_support<uint16_t
- , rgba_t
- > : write_support_true
- , png_rw_support_base< 16
- , PNG_COLOR_TYPE_RGBA
- >
- {};
- #ifdef BOOST_GIL_IO_ENABLE_GRAY_ALPHA
- template<>
- struct png_write_support<uint16_t
- , gray_alpha_t
- > : write_support_true
- , png_rw_support_base< 16
- , PNG_COLOR_TYPE_GA
- >
- {};
- #endif // BOOST_GIL_IO_ENABLE_GRAY_ALPHA
- } // namespace detail
- template<typename Pixel>
- struct is_read_supported<Pixel, png_tag>
- : std::integral_constant
- <
- bool,
- detail::png_read_support
- <
- typename channel_type<Pixel>::type,
- typename color_space_type<Pixel>::type
- >::is_supported
- >
- {
- using parent_t = detail::png_read_support
- <
- typename channel_type<Pixel>::type,
- typename color_space_type<Pixel>::type
- >;
- static const png_bitdepth::type _bit_depth = parent_t::_bit_depth;
- static const png_color_type::type _color_type = parent_t::_color_type;
- };
- template<typename Pixel>
- struct is_write_supported<Pixel, png_tag>
- : std::integral_constant
- <
- bool,
- detail::png_write_support
- <
- typename channel_type<Pixel>::type,
- typename color_space_type<Pixel>::type
- >::is_supported
- >
- {
- using parent_t = detail::png_write_support
- <
- typename channel_type<Pixel>::type,
- typename color_space_type<Pixel>::type
- >;
- static const png_bitdepth::type _bit_depth = parent_t::_bit_depth;
- static const png_color_type::type _color_type = parent_t::_color_type;
- };
- } // namespace gil
- } // namespace boost
- #endif
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