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+/*
+ Copyright 2007-2008 Christian Henning, Andreas Pokorny, Lubomir Bourdev
+ 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).
+*/
+
+/*************************************************************************************************/
+
+#ifndef BOOST_GIL_EXTENSION_IO_PNG_DETAIL_SUPPORTED_TYPES_HPP
+#define BOOST_GIL_EXTENSION_IO_PNG_DETAIL_SUPPORTED_TYPES_HPP
+
+////////////////////////////////////////////////////////////////////////////////////////
+/// \file
+/// \brief
+/// \author Christian Henning, Andreas Pokorny, Lubomir Bourdev \n
+///
+/// \date 2007-2008 \n
+///
+////////////////////////////////////////////////////////////////////////////////////////
+
+#ifdef BOOST_GIL_IO_ENABLE_GRAY_ALPHA
+#include <boost/gil/extension/toolbox/color_spaces/gray_alpha.hpp>
+#endif // BOOST_GIL_IO_ENABLE_GRAY_ALPHA
+
+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
+ >
+ : mpl::bool_< detail::png_read_support< typename channel_type< Pixel >::type
+ , typename color_space_type< Pixel >::type
+ >::is_supported
+ >
+{
+ typedef detail::png_read_support< typename channel_type< Pixel >::type
+ , typename color_space_type< Pixel >::type
+ > parent_t;
+
+ 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
+ >
+ : mpl::bool_< detail::png_write_support< typename channel_type< Pixel >::type
+ , typename color_space_type< Pixel >::type
+ >::is_supported
+ >
+{
+ typedef detail::png_write_support< typename channel_type< Pixel >::type
+ , typename color_space_type< Pixel >::type
+ > parent_t;
+
+ 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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