boost/gil/extension/io/jpeg/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_JPEG_DETAIL_SUPPORTED_TYPES_HPP
#define BOOST_GIL_EXTENSION_IO_JPEG_DETAIL_SUPPORTED_TYPES_HPP
#include <boost/gil/extension/io/jpeg/tags.hpp>
#include <boost/gil/channel.hpp>
#include <boost/gil/color_base.hpp>
#include <type_traits>
namespace boost { namespace gil { namespace detail {
// Read support
template< jpeg_color_space::type ColorSpace >
struct jpeg_rw_support_base
{
static const jpeg_color_space::type _color_space = ColorSpace;
};
template< typename Channel
, typename ColorSpace
>
struct jpeg_read_support : read_support_false
, jpeg_rw_support_base< JCS_UNKNOWN > {};
template<>
struct jpeg_read_support<uint8_t
, rgb_t
> : read_support_true
, jpeg_rw_support_base< JCS_RGB > {};
template<>
struct jpeg_read_support<uint8_t
, cmyk_t
> : read_support_true
, jpeg_rw_support_base< JCS_CMYK > {};
template<>
struct jpeg_read_support<uint8_t
, gray_t
> : read_support_true
, jpeg_rw_support_base< JCS_GRAYSCALE > {};
// Write support
template< typename Channel
, typename ColorSpace
>
struct jpeg_write_support : write_support_false
, jpeg_rw_support_base< JCS_UNKNOWN > {};
template<>
struct jpeg_write_support<uint8_t
, gray_t
> : write_support_true
, jpeg_rw_support_base< JCS_GRAYSCALE > {};
template<>
struct jpeg_write_support<uint8_t
, rgb_t
> : write_support_true
, jpeg_rw_support_base< JCS_RGB > {};
template<>
struct jpeg_write_support<uint8_t
, cmyk_t
> : write_support_true
, jpeg_rw_support_base< JCS_CMYK > {};
} // namespace detail
template<typename Pixel>
struct is_read_supported<Pixel, jpeg_tag>
: std::integral_constant
<
bool,
detail::jpeg_read_support
<
typename channel_type<Pixel>::type,
typename color_space_type<Pixel>::type
>::is_supported
>
{
using parent_t = detail::jpeg_read_support
<
typename channel_type<Pixel>::type,
typename color_space_type<Pixel>::type
>;
static const typename jpeg_color_space::type _color_space = parent_t::_color_space;
};
template<typename Pixel>
struct is_write_supported<Pixel, jpeg_tag>
: std::integral_constant
<
bool,
detail::jpeg_write_support
<
typename channel_type<Pixel>::type,
typename color_space_type<Pixel>::type
>::is_supported
>
{};
} // namespace gil
} // namespace boost
#endif