83 lines
3.0 KiB
C++
83 lines
3.0 KiB
C++
//
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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/mpl/and.hpp>
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#include <boost/mpl/at.hpp>
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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> 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> : mpl::true_{};
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template<typename C,typename CMP, int Next, int Last>
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struct is_homogeneous_impl : mpl::and_< is_homogeneous_impl< C, CMP,Next + 1, Last >
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, is_same< CMP, typename mpl::at_c<C,Next>::type
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> > {};
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template < typename P > struct is_homogeneous : mpl::false_ {};
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// pixel
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template < typename C, typename L > struct is_homogeneous< pixel<C,L> > : mpl::true_ {};
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template < typename C, typename L > struct is_homogeneous<const pixel<C,L> > : mpl::true_ {};
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template < typename C, typename L > struct is_homogeneous< pixel<C,L>& > : mpl::true_ {};
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template < typename C, typename L > struct is_homogeneous<const pixel<C,L>& > : mpl::true_ {};
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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 > > : mpl::true_ {};
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template <typename Channel, typename ColorSpace>
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struct is_homogeneous< const planar_pixel_reference< Channel, ColorSpace > > : mpl::true_ {};
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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< C
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, typename mpl::at_c< C, 0 >::type
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, 1
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, mpl::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< const packed_pixel< B, C, L > >
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: is_homogeneous_impl_p< C
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, typename mpl::at_c<C,0>::type
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, 1
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, mpl::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,typename mpl::at_c<C,0>::type,1,mpl::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,typename mpl::at_c<C,0>::type,1,mpl::size<C>::value>
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{};
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} // namespace gil
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} // namespace boost
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#endif
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