metafunctions.hpp Go to the documentation of this file. /* Copyright 2005-2007 Adobe Systems Incorporated Use, modification and distribution are subject to 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). See http://opensource.adobe.com/gil for most recent version including documentation. */ /*************************************************************************************************/ #ifndef GIL_METAFUNCTIONS_HPP #define GIL_METAFUNCTIONS_HPP #include <iterator> #include <boost/mpl/accumulate.hpp> #include <boost/mpl/back.hpp> #include <boost/mpl/bool.hpp> #include <boost/mpl/if.hpp> #include <boost/mpl/pop_back.hpp> #include <boost/mpl/push_back.hpp> #include <boost/mpl/transform.hpp> #include <boost/mpl/vector.hpp> #include <boost/type_traits.hpp> #include "gil_config.hpp" #include "gil_concept.hpp" #include "channel.hpp" namespace boost { namespace gil { // forward declarations template <typename T, typename L> struct pixel; template <typename BitField,typename ChannelRefVec,typename Layout> struct packed_pixel; template <typename T, typename C> struct planar_pixel_reference; template <typename IC, typename C> struct planar_pixel_iterator; template <typename I> class memory_based_step_iterator; template <typename I> class memory_based_2d_locator; template <typename L> class image_view; template <typename Pixel, bool IsPlanar, typename Alloc> class image; template <typename T> struct channel_type; template <typename T> struct color_space_type; template <typename T> struct channel_mapping_type; template <typename It> struct is_iterator_adaptor; template <typename It> struct iterator_adaptor_get_base; template <typename ChannelBitSizes, typename Layout, bool IsMutable> struct bit_aligned_pixel_reference; template <typename PixelRef> struct pixel_reference_is_basic : public mpl::false_ {}; template <typename T, typename L> struct pixel_reference_is_basic< pixel<T,L>&> : public mpl::true_ {}; template <typename T, typename L> struct pixel_reference_is_basic<const pixel<T,L>&> : public mpl::true_ {}; template <typename TR, typename Cs> struct pixel_reference_is_basic<planar_pixel_reference<TR,Cs> > : public mpl::true_ {}; template <typename TR, typename Cs> struct pixel_reference_is_basic<const planar_pixel_reference<TR,Cs> > : public mpl::true_ {}; template <typename Iterator> struct iterator_is_basic : public mpl::false_ {}; template <typename T, typename L> // mutable interleaved struct iterator_is_basic< pixel<T,L>* > : public mpl::true_ {}; template <typename T, typename L> // immutable interleaved struct iterator_is_basic<const pixel<T,L>* > : public mpl::true_ {}; template <typename T, typename Cs> // mutable planar struct iterator_is_basic<planar_pixel_iterator< T*,Cs> > : public mpl::true_ {}; template <typename T, typename Cs> // immutable planar struct iterator_is_basic<planar_pixel_iterator<const T*,Cs> > : public mpl::true_ {}; template <typename T, typename L> // mutable interleaved step struct iterator_is_basic<memory_based_step_iterator< pixel<T,L>*> > : public mpl::true_ {}; template <typename T, typename L> // immutable interleaved step struct iterator_is_basic<memory_based_step_iterator<const pixel<T,L>*> > : public mpl::true_ {}; template <typename T, typename Cs> // mutable planar step struct iterator_is_basic<memory_based_step_iterator<planar_pixel_iterator< T*,Cs> > > : public mpl::true_ {}; template <typename T, typename Cs> // immutable planar step struct iterator_is_basic<memory_based_step_iterator<planar_pixel_iterator<const T*,Cs> > > : public mpl::true_ {}; template <typename Loc> struct locator_is_basic : public mpl::false_ {}; template <typename Iterator> struct locator_is_basic<memory_based_2d_locator<memory_based_step_iterator<Iterator> > > : public iterator_is_basic<Iterator> {}; template <typename View> struct view_is_basic : public mpl::false_ {}; template <typename Loc> struct view_is_basic<image_view<Loc> > : public locator_is_basic<Loc> {}; template <typename Img> struct image_is_basic : public mpl::false_ {}; template <typename Pixel, bool IsPlanar, typename Alloc> struct image_is_basic<image<Pixel,IsPlanar,Alloc> > : public mpl::true_ {}; template <typename I> struct iterator_is_step; namespace detail { template <typename It, bool IsBase, bool EqualsStepType> struct iterator_is_step_impl; // iterator that has the same type as its dynamic_x_step_type must be a step iterator template <typename It, bool IsBase> struct iterator_is_step_impl<It,IsBase,true> : public mpl::true_{}; // base iterator can never be a step iterator template <typename It> struct iterator_is_step_impl<It,true,false> : public mpl::false_{}; // for an iterator adaptor, see if its base is step template <typename It> struct iterator_is_step_impl<It,false,false> : public iterator_is_step<typename iterator_adaptor_get_base<It>::type>{}; } template <typename I> struct iterator_is_step : public detail::iterator_is_step_impl<I, !is_iterator_adaptor<I>::type::value, is_same<I,typename dynamic_x_step_type<I>::type>::value >{}; template <typename L> struct locator_is_step_in_x : public iterator_is_step<typename L::x_iterator> {}; template <typename L> struct locator_is_step_in_y : public iterator_is_step<typename L::y_iterator> {}; template <typename V> struct view_is_step_in_x : public locator_is_step_in_x<typename V::xy_locator> {}; template <typename V> struct view_is_step_in_y : public locator_is_step_in_y<typename V::xy_locator> {}; template <typename PixelReference> struct pixel_reference_is_proxy : public mpl::not_<is_same<typename remove_const_and_reference<PixelReference>::type, typename remove_const_and_reference<PixelReference>::type::value_type> > {}; template <typename Pixel> struct pixel_is_reference : public mpl::or_<is_reference<Pixel>, pixel_reference_is_proxy<Pixel> > {}; template <typename R> struct pixel_reference_is_mutable : public mpl::bool_<remove_reference<R>::type::is_mutable> {}; template <typename R> struct pixel_reference_is_mutable<const R&> : public mpl::and_<pixel_reference_is_proxy<R>, pixel_reference_is_mutable<R> > {}; template <typename L> struct locator_is_mutable : public iterator_is_mutable<typename L::x_iterator> {}; template <typename V> struct view_is_mutable : public iterator_is_mutable<typename V::x_iterator> {}; template <typename T, typename L, bool IsPlanar=false, bool IsMutable=true> struct pixel_reference_type{}; template <typename T, typename L> struct pixel_reference_type<T,L,false,true > { typedef pixel<T,L>& type; }; template <typename T, typename L> struct pixel_reference_type<T,L,false,false> { typedef const pixel<T,L>& type; }; template <typename T, typename L> struct pixel_reference_type<T,L,true,true> { typedef const planar_pixel_reference<typename channel_traits<T>::reference,typename color_space_type<L>::type> type; }; // TODO: Assert M=identity template <typename T, typename L> struct pixel_reference_type<T,L,true,false> { typedef const planar_pixel_reference<typename channel_traits<T>::const_reference,typename color_space_type<L>::type> type; };// TODO: Assert M=identity template <typename Pixel, bool IsPlanar=false, bool IsStep=false, bool IsMutable=true> struct iterator_type_from_pixel{}; template <typename Pixel> struct iterator_type_from_pixel<Pixel,false,false,true > { typedef Pixel* type; }; template <typename Pixel> struct iterator_type_from_pixel<Pixel,false,false,false> { typedef const Pixel* type; }; template <typename Pixel> struct iterator_type_from_pixel<Pixel,true,false,true> { typedef planar_pixel_iterator<typename channel_traits<typename channel_type<Pixel>::type>::pointer,typename color_space_type<Pixel>::type> type; }; template <typename Pixel> struct iterator_type_from_pixel<Pixel,true,false,false> { typedef planar_pixel_iterator<typename channel_traits<typename channel_type<Pixel>::type>::const_pointer,typename color_space_type<Pixel>::type> type; }; template <typename Pixel, bool IsPlanar, bool IsMutable> struct iterator_type_from_pixel<Pixel,IsPlanar,true,IsMutable> { typedef memory_based_step_iterator<typename iterator_type_from_pixel<Pixel,IsPlanar,false,IsMutable>::type> type; }; template <typename T, typename L, bool IsPlanar=false, bool IsStep=false, bool IsMutable=true> struct iterator_type{}; template <typename T, typename L> struct iterator_type<T,L,false,false,true > { typedef pixel<T,L>* type; }; template <typename T, typename L> struct iterator_type<T,L,false,false,false> { typedef const pixel<T,L>* type; }; template <typename T, typename L> struct iterator_type<T,L,true,false,true> { typedef planar_pixel_iterator<T*,typename L::color_space_t> type; }; // TODO: Assert M=identity template <typename T, typename L> struct iterator_type<T,L,true,false,false> { typedef planar_pixel_iterator<const T*,typename L::color_space_t> type; }; // TODO: Assert M=identity template <typename T, typename L, bool IsPlanar, bool IsMutable> struct iterator_type<T,L,IsPlanar,true,IsMutable> { typedef memory_based_step_iterator<typename iterator_type<T,L,IsPlanar,false,IsMutable>::type> type; }; template <typename XIterator> struct type_from_x_iterator { typedef memory_based_step_iterator<XIterator> step_iterator_t; typedef memory_based_2d_locator<step_iterator_t> xy_locator_t; typedef image_view<xy_locator_t> view_t; }; namespace detail { template <typename BitField, typename FirstBit, typename NumBits> struct packed_channel_reference_type { typedef const packed_channel_reference<BitField,FirstBit::value,NumBits::value,true> type; }; template <typename BitField, typename ChannelBitSizesVector> class packed_channel_references_vector_type { // If ChannelBitSizesVector is mpl::vector<int,7,7,2> // Then first_bits_vector will be mpl::vector<int,0,7,14,16> typedef typename mpl::accumulate<ChannelBitSizesVector, mpl::vector1<mpl::int_<0> >, mpl::push_back<mpl::_1, mpl::plus<mpl::back<mpl::_1>, mpl::_2> > >::type first_bits_vector; public: typedef typename mpl::transform<typename mpl::pop_back<first_bits_vector>::type, ChannelBitSizesVector, packed_channel_reference_type<BitField, mpl::_1,mpl::_2> >::type type; }; } template <typename BitField, typename ChannelBitSizeVector, typename Layout> struct packed_pixel_type { typedef packed_pixel<BitField, typename detail::packed_channel_references_vector_type<BitField,ChannelBitSizeVector>::type, Layout> type; }; template <typename BitField, typename ChannelBitSizeVector, typename Layout, typename Alloc=std::allocator<unsigned char> > struct packed_image_type { typedef image<typename packed_pixel_type<BitField,ChannelBitSizeVector,Layout>::type,false,Alloc> type; }; template <typename BitField, unsigned Size1, typename Layout, typename Alloc=std::allocator<unsigned char> > struct packed_image1_type : public packed_image_type<BitField, mpl::vector1_c<unsigned, Size1>, Layout, Alloc> {}; template <typename BitField, unsigned Size1, unsigned Size2, typename Layout, typename Alloc=std::allocator<unsigned char> > struct packed_image2_type : public packed_image_type<BitField, mpl::vector2_c<unsigned, Size1, Size2>, Layout, Alloc> {}; template <typename BitField, unsigned Size1, unsigned Size2, unsigned Size3, typename Layout, typename Alloc=std::allocator<unsigned char> > struct packed_image3_type : public packed_image_type<BitField, mpl::vector3_c<unsigned, Size1, Size2, Size3>, Layout, Alloc> {}; template <typename BitField, unsigned Size1, unsigned Size2, unsigned Size3, unsigned Size4, typename Layout, typename Alloc=std::allocator<unsigned char> > struct packed_image4_type : public packed_image_type<BitField, mpl::vector4_c<unsigned, Size1, Size2, Size3, Size4>, Layout, Alloc> {}; template <typename BitField, unsigned Size1, unsigned Size2, unsigned Size3, unsigned Size4, unsigned Size5, typename Layout, typename Alloc=std::allocator<unsigned char> > struct packed_image5_type : public packed_image_type<BitField, mpl::vector5_c<unsigned, Size1, Size2, Size3, Size4, Size5>, Layout, Alloc> {}; template <typename ChannelBitSizeVector, typename Layout, typename Alloc=std::allocator<unsigned char> > struct bit_aligned_image_type { private: typedef const bit_aligned_pixel_reference<ChannelBitSizeVector, Layout, true> bit_alignedref_t; public: typedef image<bit_alignedref_t,false,Alloc> type; }; template <unsigned Size1, typename Layout, typename Alloc=std::allocator<unsigned char> > struct bit_aligned_image1_type : public bit_aligned_image_type<mpl::vector1_c<unsigned, Size1>, Layout, Alloc> {}; template <unsigned Size1, unsigned Size2, typename Layout, typename Alloc=std::allocator<unsigned char> > struct bit_aligned_image2_type : public bit_aligned_image_type<mpl::vector2_c<unsigned, Size1, Size2>, Layout, Alloc> {}; template <unsigned Size1, unsigned Size2, unsigned Size3, typename Layout, typename Alloc=std::allocator<unsigned char> > struct bit_aligned_image3_type : public bit_aligned_image_type<mpl::vector3_c<unsigned, Size1, Size2, Size3>, Layout, Alloc> {}; template <unsigned Size1, unsigned Size2, unsigned Size3, unsigned Size4, typename Layout, typename Alloc=std::allocator<unsigned char> > struct bit_aligned_image4_type : public bit_aligned_image_type<mpl::vector4_c<unsigned, Size1, Size2, Size3, Size4>, Layout, Alloc> {}; template <unsigned Size1, unsigned Size2, unsigned Size3, unsigned Size4, unsigned Size5, typename Layout, typename Alloc=std::allocator<unsigned char> > struct bit_aligned_image5_type : public bit_aligned_image_type<mpl::vector5_c<unsigned, Size1, Size2, Size3, Size4, Size5>, Layout, Alloc> {}; template <typename Channel, typename Layout> struct pixel_value_type { typedef pixel<Channel,Layout> type; // by default use gil::pixel. Specializations are provided for }; // Specializations for packed channels template <typename BitField, int NumBits, bool IsMutable, typename Layout> struct pixel_value_type< packed_dynamic_channel_reference<BitField,NumBits,IsMutable>,Layout> : public packed_pixel_type<BitField, mpl::vector1_c<unsigned,NumBits>, Layout> {}; template <typename BitField, int NumBits, bool IsMutable, typename Layout> struct pixel_value_type<const packed_dynamic_channel_reference<BitField,NumBits,IsMutable>,Layout> : public packed_pixel_type<BitField, mpl::vector1_c<unsigned,NumBits>, Layout> {}; template <typename BitField, int FirstBit, int NumBits, bool IsMutable, typename Layout> struct pixel_value_type< packed_channel_reference<BitField,FirstBit,NumBits,IsMutable>,Layout> : public packed_pixel_type<BitField, mpl::vector1_c<unsigned,NumBits>, Layout> {}; template <typename BitField, int FirstBit, int NumBits, bool IsMutable, typename Layout> struct pixel_value_type<const packed_channel_reference<BitField,FirstBit,NumBits,IsMutable>,Layout> : public packed_pixel_type<BitField, mpl::vector1_c<unsigned,NumBits>, Layout> {}; template <int NumBits, typename Layout> struct pixel_value_type<packed_channel_value<NumBits>,Layout> : public packed_pixel_type<typename detail::min_fast_uint<NumBits>::type, mpl::vector1_c<unsigned,NumBits>, Layout> {}; template <typename T, typename L, bool IsPlanar=false, bool IsStepX=false, bool IsMutable=true> struct locator_type { typedef typename type_from_x_iterator<typename iterator_type<T,L,IsPlanar,IsStepX,IsMutable>::type>::xy_locator_type type; }; template <typename T, typename L, bool IsPlanar=false, bool IsStepX=false, bool IsMutable=true> struct view_type { typedef typename type_from_x_iterator<typename iterator_type<T,L,IsPlanar,IsStepX,IsMutable>::type>::view_t type; }; template <typename T, typename L, bool IsPlanar=false, typename Alloc=std::allocator<unsigned char> > struct image_type { typedef image<pixel<T,L>, IsPlanar, Alloc> type; }; template <typename Pixel, bool IsPlanar=false, bool IsStepX=false, bool IsMutable=true> struct view_type_from_pixel { typedef typename type_from_x_iterator<typename iterator_type_from_pixel<Pixel,IsPlanar,IsStepX,IsMutable>::type>::view_t type; }; template <typename Ref, typename T=use_default, typename L=use_default, typename IsPlanar=use_default, typename IsMutable=use_default> class derived_pixel_reference_type { typedef typename remove_reference<Ref>::type pixel_t; typedef typename mpl::if_<is_same<T, use_default>, typename channel_type<pixel_t>::type, T >::type channel_t; typedef typename mpl::if_<is_same<L, use_default>, layout<typename color_space_type<pixel_t>::type, typename channel_mapping_type<pixel_t>::type>, L>::type layout_t; static const bool mut =mpl::if_<is_same<IsMutable,use_default>, pixel_reference_is_mutable<Ref>, IsMutable>::type::value; static const bool planar=mpl::if_<is_same<IsPlanar,use_default>, is_planar<pixel_t>, IsPlanar>::type::value; public: typedef typename pixel_reference_type<channel_t, layout_t, planar, mut>::type type; }; template <typename Iterator, typename T=use_default, typename L=use_default, typename IsPlanar=use_default, typename IsStep=use_default, typename IsMutable=use_default> class derived_iterator_type { typedef typename mpl::if_<is_same<T ,use_default>, typename channel_type<Iterator>::type, T >::type channel_t; typedef typename mpl::if_<is_same<L,use_default>, layout<typename color_space_type<Iterator>::type, typename channel_mapping_type<Iterator>::type>, L>::type layout_t; static const bool mut =mpl::if_<is_same<IsMutable,use_default>, iterator_is_mutable<Iterator>, IsMutable>::type::value; static const bool planar=mpl::if_<is_same<IsPlanar,use_default>, is_planar<Iterator>, IsPlanar>::type::value; static const bool step =mpl::if_<is_same<IsStep ,use_default>, iterator_is_step<Iterator>, IsStep>::type::value; public: typedef typename iterator_type<channel_t, layout_t, planar, step, mut>::type type; }; template <typename View, typename T=use_default, typename L=use_default, typename IsPlanar=use_default, typename StepX=use_default, typename IsMutable=use_default> class derived_view_type { typedef typename mpl::if_<is_same<T ,use_default>, typename channel_type<View>::type, T>::type channel_t; typedef typename mpl::if_<is_same<L,use_default>, layout<typename color_space_type<View>::type, typename channel_mapping_type<View>::type>, L>::type layout_t; static const bool mut =mpl::if_<is_same<IsMutable,use_default>, view_is_mutable<View>, IsMutable>::type::value; static const bool planar=mpl::if_<is_same<IsPlanar,use_default>, is_planar<View>, IsPlanar>::type::value; static const bool step =mpl::if_<is_same<StepX ,use_default>, view_is_step_in_x<View>,StepX>::type::value; public: typedef typename view_type<channel_t, layout_t, planar, step, mut>::type type; }; template <typename Image, typename T=use_default, typename L=use_default, typename IsPlanar=use_default> class derived_image_type { typedef typename mpl::if_<is_same<T ,use_default>, typename channel_type<Image>::type, T >::type channel_t; typedef typename mpl::if_<is_same<L,use_default>, layout<typename color_space_type<Image>::type, typename channel_mapping_type<Image>::type>, L>::type layout_t; static const bool planar=mpl::if_<is_same<IsPlanar,use_default>, is_planar<Image>, IsPlanar>::type::value; public: typedef typename image_type<channel_t, layout_t, planar>::type type; }; } } // namespace boost::gil #endif

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