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- //
- // Copyright 2012 Andreas Pokorny
- //
- // 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_TOOLBOX_COLOR_SPACES_GRAY_ALPHA_HPP
- #define BOOST_GIL_EXTENSION_TOOLBOX_COLOR_SPACES_GRAY_ALPHA_HPP
- #include <boost/gil/color_convert.hpp>
- #include <boost/gil/gray.hpp>
- #include <boost/gil/typedefs.hpp>
- #include <boost/gil/detail/mp11.hpp>
- namespace boost{ namespace gil {
- using gray_alpha_t = mp11::mp_list<gray_color_t,alpha_t>;
- using gray_alpha_layout_t = layout<gray_alpha_t>;
- using alpha_gray_layout_t = layout<gray_alpha_layout_t, mp11::mp_list_c<int,1,0>>;
- GIL_DEFINE_BASE_TYPEDEFS(8, uint8_t, alpha_gray)
- GIL_DEFINE_BASE_TYPEDEFS(8s, int8_t, alpha_gray)
- GIL_DEFINE_BASE_TYPEDEFS(16, uint16_t, alpha_gray)
- GIL_DEFINE_BASE_TYPEDEFS(16s, int16_t, alpha_gray)
- GIL_DEFINE_BASE_TYPEDEFS(32, uint32_t, alpha_gray)
- GIL_DEFINE_BASE_TYPEDEFS(32s, int32_t, alpha_gray)
- GIL_DEFINE_BASE_TYPEDEFS(32f, float32_t, alpha_gray)
- GIL_DEFINE_ALL_TYPEDEFS(8, uint8_t, gray_alpha)
- GIL_DEFINE_ALL_TYPEDEFS(8s, int8_t, gray_alpha)
- GIL_DEFINE_ALL_TYPEDEFS(16, uint16_t, gray_alpha)
- GIL_DEFINE_ALL_TYPEDEFS(16s, int16_t, gray_alpha)
- GIL_DEFINE_ALL_TYPEDEFS(32, uint32_t, gray_alpha)
- GIL_DEFINE_ALL_TYPEDEFS(32s, int32_t, gray_alpha)
- GIL_DEFINE_ALL_TYPEDEFS(32f, float32_t, gray_alpha)
- /// \ingroup ColorConvert
- /// \brief Gray Alpha to RGBA
- template <>
- struct default_color_converter_impl<gray_alpha_t,rgba_t> {
- template <typename P1, typename P2>
- void operator()(const P1& src, P2& dst) const {
- get_color(dst,red_t()) =
- channel_convert<typename color_element_type<P2, red_t>::type>(get_color(src,gray_color_t()));
- get_color(dst,green_t())=
- channel_convert<typename color_element_type<P2, green_t>::type>(get_color(src,gray_color_t()));
- get_color(dst,blue_t()) =
- channel_convert<typename color_element_type<P2, blue_t>::type>(get_color(src,gray_color_t()));
- get_color(dst,alpha_t()) =
- channel_convert<typename color_element_type<P2, alpha_t>::type>(get_color(src,alpha_t()));
- }
- };
- /// \brief Gray Alpha to RGB
- template <>
- struct default_color_converter_impl<gray_alpha_t,rgb_t> {
- template <typename P1, typename P2>
- void operator()(const P1& src, P2& dst) const {
- get_color(dst,red_t()) =
- channel_convert<typename color_element_type<P2, red_t>::type>(
- channel_multiply(get_color(src,gray_color_t()),get_color(src,alpha_t()) )
- );
- get_color(dst,green_t()) =
- channel_convert<typename color_element_type<P2, green_t>::type>(
- channel_multiply(get_color(src,gray_color_t()),get_color(src,alpha_t()) )
- );
- get_color(dst,blue_t()) =
- channel_convert<typename color_element_type<P2, blue_t>::type>(
- channel_multiply(get_color(src,gray_color_t()),get_color(src,alpha_t()) )
- );
- }
- };
- /// \brief Gray Alpha to Gray
- template <>
- struct default_color_converter_impl<gray_alpha_t,gray_t> {
- template <typename P1, typename P2>
- void operator()(const P1& src, P2& dst) const {
- get_color(dst,gray_color_t()) =
- channel_convert<typename color_element_type<P2, gray_color_t>::type>(
- channel_multiply(get_color(src,gray_color_t()),get_color(src,alpha_t()) )
- );
- }
- };
- } // namespace gil
- } // namespace boost
- #endif
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