// // 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_IS_HOMOGENEOUS_HPP #define BOOST_GIL_EXTENSION_TOOLBOX_METAFUNCTIONS_IS_HOMOGENEOUS_HPP #include <boost/gil/pixel.hpp> #include <boost/gil/detail/mp11.hpp> #include <type_traits> namespace boost{ namespace gil { /// is_homogeneous metafunctions /// \brief Determines if a pixel types are homogeneous. template<typename C,typename CMP, int Next, int Last> struct is_homogeneous_impl; template<typename C, typename CMP, int Last> struct is_homogeneous_impl<C, CMP, Last, Last> : std::true_type {}; template<typename C, typename CMP, int Next, int Last> struct is_homogeneous_impl : mp11::mp_and < is_homogeneous_impl<C, CMP, Next + 1, Last>, std::is_same<CMP, mp11::mp_at_c<C, Next>> > {}; template <typename P> struct is_homogeneous : std::false_type {}; // pixel template <typename C, typename L> struct is_homogeneous<pixel<C, L>> : std::true_type {}; template <typename C, typename L > struct is_homogeneous<pixel<C, L> const> : std::true_type {}; template <typename C, typename L> struct is_homogeneous<pixel<C, L>&> : std::true_type {}; template <typename C, typename L> struct is_homogeneous<pixel<C, L> const&> : std::true_type {}; // planar pixel reference template <typename Channel, typename ColorSpace> struct is_homogeneous<planar_pixel_reference<Channel, ColorSpace>> : std::true_type {}; template <typename Channel, typename ColorSpace> struct is_homogeneous<planar_pixel_reference<Channel, ColorSpace> const> : std::true_type {}; template<typename C, typename CMP, int I, int Last> struct is_homogeneous_impl_p {}; // for packed_pixel template <typename B, typename C, typename L> struct is_homogeneous<packed_pixel<B, C, L>> : is_homogeneous_impl_p < C, mp11::mp_at_c<C, 0>, 1, mp11::mp_size<C>::value > {}; template< typename B , typename C , typename L > struct is_homogeneous<packed_pixel<B, C, L> const> : is_homogeneous_impl_p < C, mp11::mp_at_c<C, 0>, 1, mp11::mp_size<C>::value > {}; // for bit_aligned_pixel_reference template <typename B, typename C, typename L, bool M> struct is_homogeneous<bit_aligned_pixel_reference<B, C, L, M>> : is_homogeneous_impl<C, mp11::mp_at_c<C, 0>, 1, mp11::mp_size<C>::value> {}; template <typename B, typename C, typename L, bool M> struct is_homogeneous<const bit_aligned_pixel_reference<B, C, L, M> > : is_homogeneous_impl<C, mp11::mp_at_c<C, 0>, 1, mp11::mp_size<C>::value> {}; }} // namespace boost::gil #endif