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193 lines
9.0 KiB
193 lines
9.0 KiB
/* |
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Copyright 2005-2007 Adobe Systems Incorporated |
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Use, modification and distribution are subject to the Boost Software License, |
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Version 1.0. (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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See http://opensource.adobe.com/gil for most recent version including documentation. |
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*/ |
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/*************************************************************************************************/ |
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#ifndef GIL_PACKED_PIXEL_H |
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#define GIL_PACKED_PIXEL_H |
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//////////////////////////////////////////////////////////////////////////////////////// |
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/// \file |
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/// \brief A model of a heterogeneous pixel whose channels are bit ranges. For example 16-bit RGB in '565' format |
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/// \author Lubomir Bourdev and Hailin Jin \n |
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/// Adobe Systems Incorporated |
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/// \date 2005-2009 \n Last updated on February 20, 2009 |
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/// |
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//////////////////////////////////////////////////////////////////////////////////////// |
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#include <functional> |
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#include <boost/utility/enable_if.hpp> |
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#include <boost/mpl/bool.hpp> |
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#include <boost/mpl/front.hpp> |
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#include "gil_config.hpp" |
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#include "pixel.hpp" |
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namespace boost { namespace gil { |
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/// \defgroup ColorBaseModelPackedPixel packed_pixel |
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/// \ingroup ColorBaseModel |
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/// \brief A heterogeneous color base whose elements are reference proxies to channels in a pixel. Models ColorBaseValueConcept. This class is used to model packed pixels, such as 16-bit packed RGB. |
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/** |
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\defgroup PixelModelPackedPixel packed_pixel |
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\ingroup PixelModel |
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\brief A heterogeneous pixel used to represent packed pixels with non-byte-aligned channels. Models PixelValueConcept |
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Example: |
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\code |
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typedef packed_pixel_type<uint16_t, mpl::vector3_c<unsigned,5,6,5>, rgb_layout_t>::type rgb565_pixel_t; |
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BOOST_STATIC_ASSERT((sizeof(rgb565_pixel_t)==2)); |
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rgb565_pixel_t r565; |
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get_color(r565,red_t()) = 31; |
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get_color(r565,green_t()) = 63; |
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get_color(r565,blue_t()) = 31; |
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assert(r565 == rgb565_pixel_t((uint16_t)0xFFFF)); |
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\endcode |
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*/ |
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/// \ingroup ColorBaseModelPackedPixel PixelModelPackedPixel PixelBasedModel |
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/// \brief Heterogeneous pixel value whose channel references can be constructed from the pixel bitfield and their index. Models ColorBaseValueConcept, PixelValueConcept, PixelBasedConcept |
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/// Typical use for this is a model of a packed pixel (like 565 RGB) |
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template <typename BitField, // A type that holds the bits of the pixel. Typically an integral type, like boost::uint16_t |
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typename ChannelRefVec, // An MPL vector whose elements are packed channels. They must be constructible from BitField. GIL uses packed_channel_reference |
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typename Layout> // Layout defining the color space and ordering of the channels. Example value: rgb_layout_t |
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struct packed_pixel { |
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BitField _bitfield; |
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typedef Layout layout_t; |
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typedef packed_pixel value_type; |
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typedef value_type& reference; |
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typedef const value_type& const_reference; |
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BOOST_STATIC_CONSTANT(bool, is_mutable = channel_traits<typename mpl::front<ChannelRefVec>::type>::is_mutable); |
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packed_pixel(){} |
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explicit packed_pixel(const BitField& bitfield) : _bitfield(bitfield) {} |
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// Construct from another compatible pixel type |
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packed_pixel(const packed_pixel& p) : _bitfield(p._bitfield) {} |
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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); } |
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packed_pixel(int chan0, int chan1) : _bitfield(0) { |
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BOOST_STATIC_ASSERT((num_channels<packed_pixel>::value==2)); |
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at_c<0>(*this)=chan0; at_c<1>(*this)=chan1; |
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} |
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packed_pixel(int chan0, int chan1, int chan2) : _bitfield(0) { |
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BOOST_STATIC_ASSERT((num_channels<packed_pixel>::value==3)); |
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gil::at_c<0>(*this)=chan0; gil::at_c<1>(*this)=chan1; gil::at_c<2>(*this)=chan2; |
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} |
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packed_pixel(int chan0, int chan1, int chan2, int chan3) : _bitfield(0) { |
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BOOST_STATIC_ASSERT((num_channels<packed_pixel>::value==4)); |
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gil::at_c<0>(*this)=chan0; gil::at_c<1>(*this)=chan1; gil::at_c<2>(*this)=chan2; gil::at_c<3>(*this)=chan3; |
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} |
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packed_pixel(int chan0, int chan1, int chan2, int chan3, int chan4) : _bitfield(0) { |
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BOOST_STATIC_ASSERT((num_channels<packed_pixel>::value==5)); |
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gil::at_c<0>(*this)=chan0; gil::at_c<1>(*this)=chan1; gil::at_c<2>(*this)=chan2; gil::at_c<3>(*this)=chan3; gil::at_c<4>(*this)=chan4; |
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} |
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packed_pixel& operator=(const packed_pixel& p) { _bitfield=p._bitfield; return *this; } |
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template <typename P> packed_pixel& operator=(const P& p) { assign(p, mpl::bool_<is_pixel<P>::value>()); return *this; } |
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template <typename P> bool operator==(const P& p) const { return equal(p, mpl::bool_<is_pixel<P>::value>()); } |
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template <typename P> bool operator!=(const P& p) const { return !(*this==p); } |
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private: |
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template <typename Pixel> static void check_compatible() { gil_function_requires<PixelsCompatibleConcept<Pixel,packed_pixel> >(); } |
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template <typename Pixel> void assign(const Pixel& p, mpl::true_) { check_compatible<Pixel>(); static_copy(p,*this); } |
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template <typename Pixel> bool equal(const Pixel& p, mpl::true_) const { check_compatible<Pixel>(); return static_equal(*this,p); } |
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// Support for assignment/equality comparison of a channel with a grayscale pixel |
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static void check_gray() { BOOST_STATIC_ASSERT((is_same<typename Layout::color_space_t, gray_t>::value)); } |
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template <typename Channel> void assign(const Channel& chan, mpl::false_) { check_gray(); at_c<0>(*this)=chan; } |
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template <typename Channel> bool equal (const Channel& chan, mpl::false_) const { check_gray(); return at_c<0>(*this)==chan; } |
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public: |
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packed_pixel& operator= (int chan) { check_gray(); at_c<0>(*this)=chan; return *this; } |
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bool operator==(int chan) const { check_gray(); return at_c<0>(*this)==chan; } |
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}; |
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///////////////////////////// |
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// ColorBasedConcept |
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///////////////////////////// |
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template <typename BitField, typename ChannelRefVec, typename Layout, int K> |
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struct kth_element_type<packed_pixel<BitField,ChannelRefVec,Layout>,K> : public mpl::at_c<ChannelRefVec,K> {}; |
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template <typename BitField, typename ChannelRefVec, typename Layout, int K> |
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struct kth_element_reference_type<packed_pixel<BitField,ChannelRefVec,Layout>,K> : public mpl::at_c<ChannelRefVec,K> {}; |
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template <typename BitField, typename ChannelRefVec, typename Layout, int K> |
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struct kth_element_const_reference_type<packed_pixel<BitField,ChannelRefVec,Layout>,K> { |
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typedef typename channel_traits<typename mpl::at_c<ChannelRefVec,K>::type>::const_reference type; |
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}; |
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template <int K, typename P, typename C, typename L> inline |
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typename kth_element_reference_type<packed_pixel<P,C,L>, K>::type |
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at_c(packed_pixel<P,C,L>& p) { |
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return typename kth_element_reference_type<packed_pixel<P,C,L>, K>::type(&p._bitfield); |
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} |
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template <int K, typename P, typename C, typename L> inline |
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typename kth_element_const_reference_type<packed_pixel<P,C,L>, K>::type |
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at_c(const packed_pixel<P,C,L>& p) { |
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return typename kth_element_const_reference_type<packed_pixel<P,C,L>, K>::type(&p._bitfield); |
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} |
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///////////////////////////// |
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// PixelConcept |
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///////////////////////////// |
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// Metafunction predicate that flags packed_pixel as a model of PixelConcept. Required by PixelConcept |
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template <typename BitField, typename ChannelRefVec, typename Layout> |
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struct is_pixel<packed_pixel<BitField,ChannelRefVec,Layout> > : public mpl::true_{}; |
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///////////////////////////// |
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// PixelBasedConcept |
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///////////////////////////// |
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template <typename P, typename C, typename Layout> |
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struct color_space_type<packed_pixel<P,C,Layout> > { |
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typedef typename Layout::color_space_t type; |
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}; |
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template <typename P, typename C, typename Layout> |
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struct channel_mapping_type<packed_pixel<P,C,Layout> > { |
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typedef typename Layout::channel_mapping_t type; |
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}; |
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template <typename P, typename C, typename Layout> |
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struct is_planar<packed_pixel<P,C,Layout> > : mpl::false_ {}; |
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//////////////////////////////////////////////////////////////////////////////// |
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/// |
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/// Support for interleaved iterators over packed pixel |
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/// |
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//////////////////////////////////////////////////////////////////////////////// |
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/// \defgroup PixelIteratorModelPackedInterleavedPtr Pointer to packed_pixel<P,CR,Layout> |
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/// \ingroup PixelIteratorModel |
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/// \brief Iterators over interleaved pixels. |
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/// The pointer packed_pixel<P,CR,Layout>* is used as an iterator over interleaved pixels of packed format. Models PixelIteratorConcept, HasDynamicXStepTypeConcept, MemoryBasedIteratorConcept |
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template <typename P, typename C, typename L> |
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struct iterator_is_mutable<packed_pixel<P,C,L>*> : public mpl::bool_<packed_pixel<P,C,L>::is_mutable> {}; |
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template <typename P, typename C, typename L> |
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struct iterator_is_mutable<const packed_pixel<P,C,L>*> : public mpl::false_ {}; |
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} } // namespace boost::gil |
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namespace boost { |
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template <typename P, typename C, typename L> |
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struct has_trivial_constructor<gil::packed_pixel<P,C,L> > : public has_trivial_constructor<P> {}; |
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} |
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#endif
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