packed_pixel.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_PACKED_PIXEL_H #define GIL_PACKED_PIXEL_H #include <functional> #include <boost/utility/enable_if.hpp> #include <boost/mpl/bool.hpp> #include <boost/mpl/front.hpp> #include "gil_config.hpp" #include "pixel.hpp" namespace boost { namespace gil { template <typename BitField, // A type that holds the bits of the pixel. Typically an integral type, like boost::uint16_t typename ChannelRefVec, // An MPL vector whose elements are packed channels. They must be constructible from BitField. GIL uses packed_channel_reference typename Layout> // Layout defining the color space and ordering of the channels. Example value: rgb_layout_t struct packed_pixel { BitField _bitfield; typedef Layout layout_t; typedef packed_pixel value_type; typedef value_type& reference; typedef const value_type& const_reference; BOOST_STATIC_CONSTANT(bool, is_mutable = channel_traits<typename mpl::front<ChannelRefVec>::type>::is_mutable); packed_pixel(){} explicit packed_pixel(const BitField& bitfield) : _bitfield(bitfield) {} // Construct from another compatible pixel type packed_pixel(const packed_pixel& p) : _bitfield(p._bitfield) {} template <typename P> packed_pixel(const P& p, typename enable_if_c<is_pixel<P>::value>::type* d=0) { check_compatible<P>(); static_copy(p,*this); } packed_pixel(int chan0, int chan1) : _bitfield(0) { BOOST_STATIC_ASSERT((num_channels<packed_pixel>::value==2)); at_c<0>(*this)=chan0; at_c<1>(*this)=chan1; } packed_pixel(int chan0, int chan1, int chan2) : _bitfield(0) { BOOST_STATIC_ASSERT((num_channels<packed_pixel>::value==3)); at_c<0>(*this)=chan0; at_c<1>(*this)=chan1; at_c<2>(*this)=chan2; } packed_pixel(int chan0, int chan1, int chan2, int chan3) : _bitfield(0) { BOOST_STATIC_ASSERT((num_channels<packed_pixel>::value==4)); at_c<0>(*this)=chan0; at_c<1>(*this)=chan1; at_c<2>(*this)=chan2; at_c<2>(*this)=chan3; } packed_pixel(int chan0, int chan1, int chan2, int chan3, int chan4) : _bitfield(0) { BOOST_STATIC_ASSERT((num_channels<packed_pixel>::value==5)); at_c<0>(*this)=chan0; at_c<1>(*this)=chan1; at_c<2>(*this)=chan2; at_c<2>(*this)=chan3; at_c<3>(*this)=chan4; } packed_pixel& operator=(const packed_pixel& p) { _bitfield=p._bitfield; return *this; } template <typename P> packed_pixel& operator=(const P& p) { assign(p, mpl::bool_<is_pixel<P>::value>()); return *this; } template <typename P> bool operator==(const P& p) const { return equal(p, mpl::bool_<is_pixel<P>::value>()); } template <typename P> bool operator!=(const P& p) const { return !(*this==p); } private: template <typename Pixel> static void check_compatible() { gil_function_requires<PixelsCompatibleConcept<Pixel,packed_pixel> >(); } template <typename Pixel> void assign(const Pixel& p, mpl::true_) { check_compatible<Pixel>(); static_copy(p,*this); } template <typename Pixel> bool equal(const Pixel& p, mpl::true_) const { check_compatible<Pixel>(); return static_equal(*this,p); } // Support for assignment/equality comparison of a channel with a grayscale pixel static void check_gray() { BOOST_STATIC_ASSERT((is_same<typename Layout::color_space_t, gray_t>::value)); } template <typename Channel> void assign(const Channel& chan, mpl::false_) { check_gray(); at_c<0>(*this)=chan; } template <typename Channel> bool equal (const Channel& chan, mpl::false_) const { check_gray(); return at_c<0>(*this)==chan; } public: packed_pixel& operator= (int chan) { check_gray(); at_c<0>(*this)=chan; return *this; } bool operator==(int chan) const { check_gray(); return at_c<0>(*this)==chan; } }; // ColorBasedConcept template <typename BitField, typename ChannelRefVec, typename Layout, int K> struct kth_element_type<packed_pixel<BitField,ChannelRefVec,Layout>,K> : public mpl::at_c<ChannelRefVec,K> {}; template <typename BitField, typename ChannelRefVec, typename Layout, int K> struct kth_element_reference_type<packed_pixel<BitField,ChannelRefVec,Layout>,K> : public mpl::at_c<ChannelRefVec,K> {}; template <typename BitField, typename ChannelRefVec, typename Layout, int K> struct kth_element_const_reference_type<packed_pixel<BitField,ChannelRefVec,Layout>,K> { typedef typename channel_traits<typename mpl::at_c<ChannelRefVec,K>::type>::const_reference type; }; template <int K, typename P, typename C, typename L> inline typename kth_element_reference_type<packed_pixel<P,C,L>, K>::type at_c(packed_pixel<P,C,L>& p) { return typename kth_element_reference_type<packed_pixel<P,C,L>, K>::type(&p._bitfield); } template <int K, typename P, typename C, typename L> inline typename kth_element_const_reference_type<packed_pixel<P,C,L>, K>::type at_c(const packed_pixel<P,C,L>& p) { return typename kth_element_const_reference_type<packed_pixel<P,C,L>, K>::type(&p._bitfield); } // PixelConcept // Metafunction predicate that flags packed_pixel as a model of PixelConcept. Required by PixelConcept template <typename BitField, typename ChannelRefVec, typename Layout> struct is_pixel<packed_pixel<BitField,ChannelRefVec,Layout> > : public mpl::true_{}; // PixelBasedConcept template <typename P, typename C, typename Layout> struct color_space_type<packed_pixel<P,C,Layout> > { typedef typename Layout::color_space_t type; }; template <typename P, typename C, typename Layout> struct channel_mapping_type<packed_pixel<P,C,Layout> > { typedef typename Layout::channel_mapping_t type; }; template <typename P, typename C, typename Layout> struct is_planar<packed_pixel<P,C,Layout> > : mpl::false_ {}; template <typename P, typename C, typename L> struct iterator_is_mutable<packed_pixel<P,C,L>*> : public mpl::bool_<packed_pixel<P,C,L>::is_mutable> {}; template <typename P, typename C, typename L> struct iterator_is_mutable<const packed_pixel<P,C,L>*> : public mpl::false_ {}; } } // namespace boost::gil namespace boost { template <typename P, typename C, typename L> struct has_trivial_constructor<gil::packed_pixel<P,C,L> > : public has_trivial_constructor<P> {}; } #endif

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