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//
// Copyright 2005-2007 Adobe Systems Incorporated
//
// Distributed under 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
//
#ifndef BOOST_GIL_PLANAR_PIXEL_REFERENCE_HPP
#define BOOST_GIL_PLANAR_PIXEL_REFERENCE_HPP
#include <boost/gil/channel.hpp>
#include <boost/gil/color_base.hpp>
#include <boost/gil/concepts.hpp>
#include <boost/gil/pixel.hpp>
#include <boost/gil/planar_pixel_iterator.hpp>
#include <boost/mpl/range_c.hpp>
namespace boost { namespace gil {
/// \defgroup ColorBaseModelPlanarRef planar_pixel_reference
/// \ingroup ColorBaseModel
/// \brief A homogeneous color base whose element is a channel reference. Models HomogeneousColorBaseConcept, HomogeneousPixelConcept.
/// This class is used as a reference proxy to a planar pixel.
/// \defgroup PixelModelPlanarRef planar_pixel_reference
/// \ingroup PixelModel
/// \brief A reference proxy to a planar pixel. Models HomogeneousColorBaseConcept, HomogeneousPixelConcept.
/// \ingroup PixelModelPlanarRef ColorBaseModelPlanarRef PixelBasedModel
/// \brief A reference proxy to a planar pixel. Models: HomogeneousColorBaseConcept, HomogeneousPixelConcept
///
/// A reference to a planar pixel is a proxy class containing references to each of the corresponding channels.
///
template <typename ChannelReference, typename ColorSpace> // ChannelReference is a channel reference (const or mutable)
struct planar_pixel_reference
: public detail::homogeneous_color_base<ChannelReference,layout<ColorSpace>,mpl::size<ColorSpace>::value>
{
using parent_t = detail::homogeneous_color_base<ChannelReference,layout<ColorSpace>,mpl::size<ColorSpace>::value>;
private:
// These three are only defined for homogeneous pixels
using channel_t = typename channel_traits<ChannelReference>::value_type;
using channel_const_reference = typename channel_traits<ChannelReference>::const_reference;
public:
static constexpr bool is_mutable = channel_traits<ChannelReference>::is_mutable;
using value_type = pixel<channel_t,layout<ColorSpace>>;
using reference = planar_pixel_reference<ChannelReference, ColorSpace>;
using const_reference = planar_pixel_reference<channel_const_reference,ColorSpace>;
planar_pixel_reference(ChannelReference v0, ChannelReference v1) : parent_t(v0,v1) {}
planar_pixel_reference(ChannelReference v0, ChannelReference v1, ChannelReference v2) : parent_t(v0,v1,v2) {}
planar_pixel_reference(ChannelReference v0, ChannelReference v1, ChannelReference v2, ChannelReference v3) : parent_t(v0,v1,v2,v3) {}
planar_pixel_reference(ChannelReference v0, ChannelReference v1, ChannelReference v2, ChannelReference v3, ChannelReference v4) : parent_t(v0,v1,v2,v3,v4) {}
planar_pixel_reference(ChannelReference v0, ChannelReference v1, ChannelReference v2, ChannelReference v3, ChannelReference v4, ChannelReference v5) : parent_t(v0,v1,v2,v3,v4,v5) {}
template <typename P> planar_pixel_reference(const P& p) : parent_t(p) { check_compatible<P>();}
// PERFORMANCE_CHECK: Is this constructor necessary?
template <typename ChannelV, typename Mapping>
planar_pixel_reference(pixel<ChannelV,layout<ColorSpace,Mapping> >& p) : parent_t(p) { check_compatible<pixel<ChannelV,layout<ColorSpace,Mapping> > >();}
// Construct at offset from a given location
template <typename ChannelPtr> planar_pixel_reference(const planar_pixel_iterator<ChannelPtr,ColorSpace>& p, std::ptrdiff_t diff) : parent_t(p,diff) {}
const planar_pixel_reference& operator=(const planar_pixel_reference& p) const { static_copy(p,*this); return *this; }
template <typename P> const planar_pixel_reference& operator=(const P& p) const { check_compatible<P>(); static_copy(p,*this); return *this; }
// This overload is necessary for a compiler implementing Core Issue 574
// to prevent generation of an implicit copy assignment operator (the reason
// for generating implicit copy assignment operator is that according to
// Core Issue 574, a cv-qualified assignment operator is not considered
// "copy assignment operator").
// EDG implemented Core Issue 574 starting with EDG Version 3.8. I'm not
// sure why they did it for a template member function as well.
#if BOOST_WORKAROUND(__HP_aCC, >= 61700) || BOOST_WORKAROUND(__INTEL_COMPILER, >= 1000)
const planar_pixel_reference& operator=(const planar_pixel_reference& p) { static_copy(p,*this); return *this; }
template <typename P> const planar_pixel_reference& operator=(const P& p) { check_compatible<P>(); static_copy(p,*this); return *this; }
#endif
template <typename P> bool operator==(const P& p) const { check_compatible<P>(); return static_equal(*this,p); }
template <typename P> bool operator!=(const P& p) const { return !(*this==p); }
ChannelReference operator[](std::size_t i) const { return this->at_c_dynamic(i); }
const planar_pixel_reference* operator->() const { return this; }
private:
template <typename Pixel> static void check_compatible() { gil_function_requires<PixelsCompatibleConcept<Pixel,planar_pixel_reference> >(); }
};
/////////////////////////////
// ColorBasedConcept
/////////////////////////////
template <typename ChannelReference, typename ColorSpace, int K>
struct kth_element_type<planar_pixel_reference<ChannelReference,ColorSpace>, K> {
using type = ChannelReference;
};
template <typename ChannelReference, typename ColorSpace, int K>
struct kth_element_reference_type<planar_pixel_reference<ChannelReference,ColorSpace>, K> {
using type = ChannelReference;
};
template <typename ChannelReference, typename ColorSpace, int K>
struct kth_element_const_reference_type<planar_pixel_reference<ChannelReference,ColorSpace>, K>
: public add_reference<typename add_const<ChannelReference>::type>
{
// using type = typename channel_traits<ChannelReference>::const_reference;
};
/////////////////////////////
// PixelConcept
/////////////////////////////
/// \brief Metafunction predicate that flags planar_pixel_reference as a model of PixelConcept. Required by PixelConcept
/// \ingroup PixelModelPlanarRef
template <typename ChannelReference, typename ColorSpace>
struct is_pixel< planar_pixel_reference<ChannelReference,ColorSpace> > : public mpl::true_{};
/////////////////////////////
// HomogeneousPixelBasedConcept
/////////////////////////////
/// \brief Specifies the color space type of a planar pixel reference. Required by PixelBasedConcept
/// \ingroup PixelModelPlanarRef
template <typename ChannelReference, typename ColorSpace>
struct color_space_type<planar_pixel_reference<ChannelReference,ColorSpace> > {
using type = ColorSpace;
};
/// \brief Specifies the color space type of a planar pixel reference. Required by PixelBasedConcept
/// \ingroup PixelModelPlanarRef
template <typename ChannelReference, typename ColorSpace>
struct channel_mapping_type<planar_pixel_reference<ChannelReference,ColorSpace> > {
using type = typename layout<ColorSpace>::channel_mapping_t;
};
/// \brief Specifies that planar_pixel_reference represents a planar construct. Required by PixelBasedConcept
/// \ingroup PixelModelPlanarRef
template <typename ChannelReference, typename ColorSpace>
struct is_planar<planar_pixel_reference<ChannelReference,ColorSpace> > : mpl::true_ {};
/// \brief Specifies the color space type of a planar pixel reference. Required by HomogeneousPixelBasedConcept
/// \ingroup PixelModelPlanarRef
template <typename ChannelReference, typename ColorSpace>
struct channel_type<planar_pixel_reference<ChannelReference,ColorSpace> > {
using type = typename channel_traits<ChannelReference>::value_type;
};
}} // namespace boost::gil
namespace std {
// We are forced to define swap inside std namespace because on some platforms (Visual Studio 8) STL calls swap qualified.
// swap with 'left bias':
// - swap between proxy and anything
// - swap between value type and proxy
// - swap between proxy and proxy
// Having three overloads allows us to swap between different (but compatible) models of PixelConcept
/// \brief swap for planar_pixel_reference
/// \ingroup PixelModelPlanarRef
template <typename CR, typename CS, typename R> inline
void swap(const boost::gil::planar_pixel_reference<CR,CS> x, R& y) {
boost::gil::swap_proxy<typename boost::gil::planar_pixel_reference<CR,CS>::value_type>(x,y);
}
/// \brief swap for planar_pixel_reference
/// \ingroup PixelModelPlanarRef
template <typename CR, typename CS> inline
void swap(typename boost::gil::planar_pixel_reference<CR,CS>::value_type& x, const boost::gil::planar_pixel_reference<CR,CS> y) {
boost::gil::swap_proxy<typename boost::gil::planar_pixel_reference<CR,CS>::value_type>(x,y);
}
/// \brief swap for planar_pixel_reference
/// \ingroup PixelModelPlanarRef
template <typename CR, typename CS> inline
void swap(const boost::gil::planar_pixel_reference<CR,CS> x, const boost::gil::planar_pixel_reference<CR,CS> y) {
boost::gil::swap_proxy<typename boost::gil::planar_pixel_reference<CR,CS>::value_type>(x,y);
}
} // namespace std
#endif
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