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// // Copyright 2012 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_TOOLBOX_METAFUNCTIONS_CHANNEL_TYPE_HPP #define BOOST_GIL_EXTENSION_TOOLBOX_METAFUNCTIONS_CHANNEL_TYPE_HPP #include <boost/gil/extension/toolbox/dynamic_images.hpp> #include <boost/gil/extension/toolbox/metafunctions/get_num_bits.hpp> #include <boost/gil/extension/toolbox/metafunctions/is_homogeneous.hpp> #include <boost/gil/bit_aligned_pixel_reference.hpp> #include <boost/gil/channel.hpp> #include <boost/gil/detail/mp11.hpp> #include <boost/utility/enable_if.hpp> // boost::lazy_enable_if namespace boost{ namespace gil { /// channel_type metafunction /// \brief Generates the channel type for template <typename B, typename C, typename L, bool M> struct gen_chan_ref { using type = packed_dynamic_channel_reference < B, mp11::mp_at_c<C, 0>::value, M >; }; //! This implementation works for bit_algined_pixel_reference //! with a homogeneous channel layout. //! The result type will be a packed_dynamic_channel_reference, since the //! offset info will be missing. // bit_aligned_pixel_reference template <typename B, typename C, typename L, bool M> struct channel_type< bit_aligned_pixel_reference<B,C,L,M> > : lazy_enable_if< is_homogeneous< bit_aligned_pixel_reference< B, C, L, M > > , gen_chan_ref< B, C, L, M > > {}; template <typename B, typename C, typename L, bool M> struct channel_type<const bit_aligned_pixel_reference<B,C,L,M> > : lazy_enable_if< is_homogeneous< bit_aligned_pixel_reference< B, C, L, M > > , gen_chan_ref< B, C, L, M > > {}; template <typename B, typename C, typename L> struct gen_chan_ref_p { using type = packed_dynamic_channel_reference < B, get_num_bits<mp11::mp_at_c<C, 0>>::value, true >; }; // packed_pixel template < typename BitField , typename ChannelRefs , typename Layout > struct channel_type< packed_pixel< BitField , ChannelRefs , Layout > > : lazy_enable_if< is_homogeneous< packed_pixel< BitField , ChannelRefs , Layout > > , gen_chan_ref_p< BitField , ChannelRefs , Layout > > {}; template <typename B, typename C, typename L> struct channel_type< const packed_pixel< B, C, L > > : lazy_enable_if< is_homogeneous<packed_pixel< B, C, L > > , gen_chan_ref_p< B, C, L > > {}; template<> struct channel_type< any_image_pixel_t > { using type = any_image_channel_t; }; } // namespace gil } // namespace boost #endif
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