//
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// Copyright 2012 Christian Henning, Andreas Pokorny, Lubomir Bourdev
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//
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// Distributed under the Boost Software License, Version 1.0
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// See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt
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//
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#ifndef BOOST_GIL_EXTENSION_TOOLBOX_METAFUNCTIONS_IS_HOMOGENEOUS_HPP
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#define BOOST_GIL_EXTENSION_TOOLBOX_METAFUNCTIONS_IS_HOMOGENEOUS_HPP
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#include <boost/gil/pixel.hpp>
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#include <boost/gil/detail/mp11.hpp>
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#include <type_traits>
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namespace boost{ namespace gil {
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/// is_homogeneous metafunctions
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/// \brief Determines if a pixel types are homogeneous.
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template<typename C,typename CMP, int Next, int Last>
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struct is_homogeneous_impl;
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template<typename C, typename CMP, int Last>
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struct is_homogeneous_impl<C, CMP, Last, Last> : std::true_type {};
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template<typename C, typename CMP, int Next, int Last>
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struct is_homogeneous_impl
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: mp11::mp_and
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<
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is_homogeneous_impl<C, CMP, Next + 1, Last>,
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std::is_same<CMP, mp11::mp_at_c<C, Next>>
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>
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{};
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template <typename P>
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struct is_homogeneous : std::false_type {};
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// pixel
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template <typename C, typename L>
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struct is_homogeneous<pixel<C, L>> : std::true_type {};
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template <typename C, typename L >
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struct is_homogeneous<pixel<C, L> const> : std::true_type {};
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template <typename C, typename L>
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struct is_homogeneous<pixel<C, L>&> : std::true_type {};
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template <typename C, typename L>
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struct is_homogeneous<pixel<C, L> const&> : std::true_type {};
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// planar pixel reference
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template <typename Channel, typename ColorSpace>
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struct is_homogeneous<planar_pixel_reference<Channel, ColorSpace>> : std::true_type {};
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template <typename Channel, typename ColorSpace>
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struct is_homogeneous<planar_pixel_reference<Channel, ColorSpace> const> : std::true_type {};
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template<typename C, typename CMP, int I, int Last>
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struct is_homogeneous_impl_p {};
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// for packed_pixel
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template <typename B, typename C, typename L>
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struct is_homogeneous<packed_pixel<B, C, L>>
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: is_homogeneous_impl_p
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<
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C,
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mp11::mp_at_c<C, 0>,
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1,
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mp11::mp_size<C>::value
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> {};
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template< typename B
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, typename C
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, typename L
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>
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struct is_homogeneous<packed_pixel<B, C, L> const>
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: is_homogeneous_impl_p
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<
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C,
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mp11::mp_at_c<C, 0>,
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1,
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mp11::mp_size<C>::value
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> {};
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// for bit_aligned_pixel_reference
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template <typename B, typename C, typename L, bool M>
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struct is_homogeneous<bit_aligned_pixel_reference<B, C, L, M>>
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: is_homogeneous_impl<C, mp11::mp_at_c<C, 0>, 1, mp11::mp_size<C>::value>
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{};
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template <typename B, typename C, typename L, bool M>
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struct is_homogeneous<const bit_aligned_pixel_reference<B, C, L, M> >
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: is_homogeneous_impl<C, mp11::mp_at_c<C, 0>, 1, mp11::mp_size<C>::value>
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{};
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}} // namespace boost::gil
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#endif
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