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Current File : //proc/self/root/usr/include/boost/gil/extension/io/png/detail/supported_types.hpp //
// 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>
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
>
{
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
>
: mpl::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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