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194 lines
9.2 KiB
C++
194 lines
9.2 KiB
C++
/*
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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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