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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_COLOR_BASE_HPP
#define BOOST_GIL_COLOR_BASE_HPP
#include <boost/gil/utilities.hpp>
#include <boost/gil/concepts.hpp>
#include <boost/assert.hpp>
#include <boost/config.hpp>
#include <boost/mpl/range_c.hpp>
#include <boost/mpl/size.hpp>
#include <boost/mpl/vector_c.hpp>
#include <boost/type_traits.hpp>
namespace boost { namespace gil {
// Forward-declare
template <typename P> P* memunit_advanced(const P* p, std::ptrdiff_t diff);
// Forward-declare semantic_at_c
template <int K, typename ColorBase>
auto semantic_at_c(ColorBase& p)
-> typename std::enable_if
<
!std::is_const<ColorBase>::value,
typename kth_semantic_element_reference_type<ColorBase, K>::type
>::type;
template <int K, typename ColorBase>
typename kth_semantic_element_const_reference_type<ColorBase,K>::type semantic_at_c(const ColorBase& p);
// Forward declare element_reference_type
template <typename ColorBase> struct element_reference_type;
template <typename ColorBase> struct element_const_reference_type;
template <typename ColorBase, int K> struct kth_element_type;
template <typename ColorBase, int K> struct kth_element_type<const ColorBase,K> : public kth_element_type<ColorBase,K> {};
template <typename ColorBase, int K> struct kth_element_reference_type;
template <typename ColorBase, int K> struct kth_element_reference_type<const ColorBase,K> : public kth_element_reference_type<ColorBase,K> {};
template <typename ColorBase, int K> struct kth_element_const_reference_type;
template <typename ColorBase, int K> struct kth_element_const_reference_type<const ColorBase,K> : public kth_element_const_reference_type<ColorBase,K> {};
namespace detail {
template <typename DstLayout, typename SrcLayout, int K>
struct mapping_transform
: public mpl::at<typename SrcLayout::channel_mapping_t,
typename detail::type_to_index<typename DstLayout::channel_mapping_t,mpl::integral_c<int,K> >::type
>::type {};
/// \defgroup ColorBaseModelHomogeneous detail::homogeneous_color_base
/// \ingroup ColorBaseModel
/// \brief A homogeneous color base holding one color element. Models HomogeneousColorBaseConcept or HomogeneousColorBaseValueConcept
/// If the element type models Regular, this class models HomogeneousColorBaseValueConcept.
#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400)
#pragma warning(push)
#pragma warning(disable:4512) //assignment operator could not be generated
#endif
/// \brief A homogeneous color base holding one color element. Models HomogeneousColorBaseConcept or HomogeneousColorBaseValueConcept
/// \ingroup ColorBaseModelHomogeneous
template <typename Element, typename Layout>
struct homogeneous_color_base<Element,Layout,1> {
private:
Element _v0;
public:
using layout_t = Layout;
typename element_reference_type<homogeneous_color_base>::type at(mpl::int_<0>) { return _v0; }
typename element_const_reference_type<homogeneous_color_base>::type at(mpl::int_<0>) const { return _v0; }
homogeneous_color_base() {}
homogeneous_color_base(Element v) : _v0(v) {}
// grayscale pixel values are convertible to channel type
operator Element () const { return _v0; }
template <typename E2, typename L2> homogeneous_color_base(const homogeneous_color_base<E2,L2,1>& c) : _v0(gil::at_c<0>(c)) {}
};
/// \brief A homogeneous color base holding two color elements. Models HomogeneousColorBaseConcept or HomogeneousColorBaseValueConcept
/// \ingroup ColorBaseModelHomogeneous
template <typename Element, typename Layout>
struct homogeneous_color_base<Element,Layout,2> {
private:
Element _v0, _v1;
public:
using layout_t = Layout;
typename element_reference_type<homogeneous_color_base>::type at(mpl::int_<0>) { return _v0; }
typename element_const_reference_type<homogeneous_color_base>::type at(mpl::int_<0>) const { return _v0; }
typename element_reference_type<homogeneous_color_base>::type at(mpl::int_<1>) { return _v1; }
typename element_const_reference_type<homogeneous_color_base>::type at(mpl::int_<1>) const { return _v1; }
homogeneous_color_base() {}
explicit homogeneous_color_base(Element v) : _v0(v), _v1(v) {}
homogeneous_color_base(Element v0, Element v1) : _v0(v0), _v1(v1) {}
template <typename E2, typename L2> homogeneous_color_base(const homogeneous_color_base<E2,L2,2>& c) :
_v0(gil::at_c<mapping_transform<Layout,L2,0>::value>(c)),
_v1(gil::at_c<mapping_transform<Layout,L2,1>::value>(c)) {}
// Support for l-value reference proxy copy construction
template <typename E2, typename L2> homogeneous_color_base( homogeneous_color_base<E2,L2,2>& c) :
_v0(gil::at_c<mapping_transform<Layout,L2,0>::value>(c)),
_v1(gil::at_c<mapping_transform<Layout,L2,1>::value>(c)) {}
// Support for planar_pixel_iterator construction and dereferencing
template <typename P> homogeneous_color_base(P* p,bool) :
_v0(&semantic_at_c<0>(*p)),
_v1(&semantic_at_c<1>(*p)) {}
template <typename Ref> Ref deref() const {
return Ref(*semantic_at_c<0>(*this),
*semantic_at_c<1>(*this)); }
// Support for planar_pixel_reference offset constructor
template <typename Ptr> homogeneous_color_base(const Ptr& ptr, std::ptrdiff_t diff)
: _v0(*memunit_advanced(semantic_at_c<0>(ptr),diff)),
_v1(*memunit_advanced(semantic_at_c<1>(ptr),diff)) {}
// Support for planar_pixel_reference operator[]
Element at_c_dynamic(std::size_t i) const {
if (i==0) return _v0;
return _v1;
}
};
/// \brief A homogeneous color base holding three color elements. Models HomogeneousColorBaseConcept or HomogeneousColorBaseValueConcept
/// \ingroup ColorBaseModelHomogeneous
template <typename Element, typename Layout>
struct homogeneous_color_base<Element,Layout,3> {
private:
Element _v0, _v1, _v2;
public:
using layout_t = Layout;
typename element_reference_type<homogeneous_color_base>::type at(mpl::int_<0>) { return _v0; }
typename element_const_reference_type<homogeneous_color_base>::type at(mpl::int_<0>) const { return _v0; }
typename element_reference_type<homogeneous_color_base>::type at(mpl::int_<1>) { return _v1; }
typename element_const_reference_type<homogeneous_color_base>::type at(mpl::int_<1>) const { return _v1; }
typename element_reference_type<homogeneous_color_base>::type at(mpl::int_<2>) { return _v2; }
typename element_const_reference_type<homogeneous_color_base>::type at(mpl::int_<2>) const { return _v2; }
homogeneous_color_base() {}
explicit homogeneous_color_base(Element v) : _v0(v), _v1(v), _v2(v) {}
homogeneous_color_base(Element v0, Element v1, Element v2) : _v0(v0), _v1(v1), _v2(v2) {}
template <typename E2, typename L2> homogeneous_color_base(const homogeneous_color_base<E2,L2,3>& c) :
_v0(gil::at_c<mapping_transform<Layout,L2,0>::value>(c)),
_v1(gil::at_c<mapping_transform<Layout,L2,1>::value>(c)),
_v2(gil::at_c<mapping_transform<Layout,L2,2>::value>(c)) {}
// Support for l-value reference proxy copy construction
template <typename E2, typename L2> homogeneous_color_base( homogeneous_color_base<E2,L2,3>& c) :
_v0(gil::at_c<mapping_transform<Layout,L2,0>::value>(c)),
_v1(gil::at_c<mapping_transform<Layout,L2,1>::value>(c)),
_v2(gil::at_c<mapping_transform<Layout,L2,2>::value>(c)) {}
// Support for planar_pixel_iterator construction and dereferencing
template <typename P> homogeneous_color_base(P* p,bool) :
_v0(&semantic_at_c<0>(*p)),
_v1(&semantic_at_c<1>(*p)),
_v2(&semantic_at_c<2>(*p)) {}
template <typename Ref> Ref deref() const {
return Ref(*semantic_at_c<0>(*this),
*semantic_at_c<1>(*this),
*semantic_at_c<2>(*this)); }
// Support for planar_pixel_reference offset constructor
template <typename Ptr> homogeneous_color_base(const Ptr& ptr, std::ptrdiff_t diff)
: _v0(*memunit_advanced(semantic_at_c<0>(ptr),diff)),
_v1(*memunit_advanced(semantic_at_c<1>(ptr),diff)),
_v2(*memunit_advanced(semantic_at_c<2>(ptr),diff)) {}
// Support for planar_pixel_reference operator[]
Element at_c_dynamic(std::size_t i) const {
switch (i) {
case 0: return _v0;
case 1: return _v1;
}
return _v2;
}
};
/// \brief A homogeneous color base holding four color elements. Models HomogeneousColorBaseConcept or HomogeneousColorBaseValueConcept
/// \ingroup ColorBaseModelHomogeneous
template <typename Element, typename Layout>
struct homogeneous_color_base<Element,Layout,4> {
private:
Element _v0, _v1, _v2, _v3;
public:
using layout_t = Layout;
typename element_reference_type<homogeneous_color_base>::type at(mpl::int_<0>) { return _v0; }
typename element_const_reference_type<homogeneous_color_base>::type at(mpl::int_<0>) const { return _v0; }
typename element_reference_type<homogeneous_color_base>::type at(mpl::int_<1>) { return _v1; }
typename element_const_reference_type<homogeneous_color_base>::type at(mpl::int_<1>) const { return _v1; }
typename element_reference_type<homogeneous_color_base>::type at(mpl::int_<2>) { return _v2; }
typename element_const_reference_type<homogeneous_color_base>::type at(mpl::int_<2>) const { return _v2; }
typename element_reference_type<homogeneous_color_base>::type at(mpl::int_<3>) { return _v3; }
typename element_const_reference_type<homogeneous_color_base>::type at(mpl::int_<3>) const { return _v3; }
homogeneous_color_base() {}
explicit homogeneous_color_base(Element v) : _v0(v), _v1(v), _v2(v), _v3(v) {}
homogeneous_color_base(Element v0, Element v1, Element v2, Element v3) : _v0(v0), _v1(v1), _v2(v2), _v3(v3) {}
template <typename E2, typename L2> homogeneous_color_base(const homogeneous_color_base<E2,L2,4>& c) :
_v0(gil::at_c<mapping_transform<Layout,L2,0>::value>(c)),
_v1(gil::at_c<mapping_transform<Layout,L2,1>::value>(c)),
_v2(gil::at_c<mapping_transform<Layout,L2,2>::value>(c)),
_v3(gil::at_c<mapping_transform<Layout,L2,3>::value>(c)) {}
// Support for l-value reference proxy copy construction
template <typename E2, typename L2> homogeneous_color_base( homogeneous_color_base<E2,L2,4>& c) :
_v0(gil::at_c<mapping_transform<Layout,L2,0>::value>(c)),
_v1(gil::at_c<mapping_transform<Layout,L2,1>::value>(c)),
_v2(gil::at_c<mapping_transform<Layout,L2,2>::value>(c)),
_v3(gil::at_c<mapping_transform<Layout,L2,3>::value>(c)) {}
// Support for planar_pixel_iterator construction and dereferencing
template <typename P> homogeneous_color_base(P* p,bool) :
_v0(&semantic_at_c<0>(*p)),
_v1(&semantic_at_c<1>(*p)),
_v2(&semantic_at_c<2>(*p)),
_v3(&semantic_at_c<3>(*p)) {}
template <typename Ref> Ref deref() const {
return Ref(*semantic_at_c<0>(*this),
*semantic_at_c<1>(*this),
*semantic_at_c<2>(*this),
*semantic_at_c<3>(*this)); }
// Support for planar_pixel_reference offset constructor
template <typename Ptr> homogeneous_color_base(const Ptr& ptr, std::ptrdiff_t diff)
: _v0(*memunit_advanced(semantic_at_c<0>(ptr),diff)),
_v1(*memunit_advanced(semantic_at_c<1>(ptr),diff)),
_v2(*memunit_advanced(semantic_at_c<2>(ptr),diff)),
_v3(*memunit_advanced(semantic_at_c<3>(ptr),diff)) {}
// Support for planar_pixel_reference operator[]
Element at_c_dynamic(std::size_t i) const {
switch (i) {
case 0: return _v0;
case 1: return _v1;
case 2: return _v2;
}
return _v3;
}
};
/// \brief A homogeneous color base holding five color elements. Models HomogeneousColorBaseConcept or HomogeneousColorBaseValueConcept
/// \ingroup ColorBaseModelHomogeneous
template <typename Element, typename Layout>
struct homogeneous_color_base<Element,Layout,5> {
private:
Element _v0, _v1, _v2, _v3, _v4;
public:
using layout_t = Layout;
typename element_reference_type<homogeneous_color_base>::type at(mpl::int_<0>) { return _v0; }
typename element_const_reference_type<homogeneous_color_base>::type at(mpl::int_<0>) const { return _v0; }
typename element_reference_type<homogeneous_color_base>::type at(mpl::int_<1>) { return _v1; }
typename element_const_reference_type<homogeneous_color_base>::type at(mpl::int_<1>) const { return _v1; }
typename element_reference_type<homogeneous_color_base>::type at(mpl::int_<2>) { return _v2; }
typename element_const_reference_type<homogeneous_color_base>::type at(mpl::int_<2>) const { return _v2; }
typename element_reference_type<homogeneous_color_base>::type at(mpl::int_<3>) { return _v3; }
typename element_const_reference_type<homogeneous_color_base>::type at(mpl::int_<3>) const { return _v3; }
typename element_reference_type<homogeneous_color_base>::type at(mpl::int_<4>) { return _v4; }
typename element_const_reference_type<homogeneous_color_base>::type at(mpl::int_<4>) const { return _v4; }
homogeneous_color_base() {}
explicit homogeneous_color_base(Element v) : _v0(v), _v1(v), _v2(v), _v3(v), _v4(v) {}
homogeneous_color_base(Element v0, Element v1, Element v2, Element v3, Element v4) : _v0(v0), _v1(v1), _v2(v2), _v3(v3), _v4(v4) {}
template <typename E2, typename L2> homogeneous_color_base(const homogeneous_color_base<E2,L2,5>& c) :
_v0(gil::at_c<mapping_transform<Layout,L2,0>::value>(c)),
_v1(gil::at_c<mapping_transform<Layout,L2,1>::value>(c)),
_v2(gil::at_c<mapping_transform<Layout,L2,2>::value>(c)),
_v3(gil::at_c<mapping_transform<Layout,L2,3>::value>(c)),
_v4(gil::at_c<mapping_transform<Layout,L2,4>::value>(c)) {}
// Support for l-value reference proxy copy construction
template <typename E2, typename L2> homogeneous_color_base( homogeneous_color_base<E2,L2,5>& c) :
_v0(gil::at_c<mapping_transform<Layout,L2,0>::value>(c)),
_v1(gil::at_c<mapping_transform<Layout,L2,1>::value>(c)),
_v2(gil::at_c<mapping_transform<Layout,L2,2>::value>(c)),
_v3(gil::at_c<mapping_transform<Layout,L2,3>::value>(c)),
_v4(gil::at_c<mapping_transform<Layout,L2,4>::value>(c)) {}
// Support for planar_pixel_iterator construction and dereferencing
template <typename P> homogeneous_color_base(P* p,bool) :
_v0(&semantic_at_c<0>(*p)),
_v1(&semantic_at_c<1>(*p)),
_v2(&semantic_at_c<2>(*p)),
_v3(&semantic_at_c<3>(*p)),
_v4(&semantic_at_c<4>(*p)) {}
template <typename Ref> Ref deref() const {
return Ref(*semantic_at_c<0>(*this),
*semantic_at_c<1>(*this),
*semantic_at_c<2>(*this),
*semantic_at_c<3>(*this),
*semantic_at_c<4>(*this)); }
// Support for planar_pixel_reference offset constructor
template <typename Ptr> homogeneous_color_base(const Ptr& ptr, std::ptrdiff_t diff)
: _v0(*memunit_advanced(semantic_at_c<0>(ptr),diff)),
_v1(*memunit_advanced(semantic_at_c<1>(ptr),diff)),
_v2(*memunit_advanced(semantic_at_c<2>(ptr),diff)),
_v3(*memunit_advanced(semantic_at_c<3>(ptr),diff)),
_v4(*memunit_advanced(semantic_at_c<4>(ptr),diff)) {}
// Support for planar_pixel_reference operator[]
Element at_c_dynamic(std::size_t i) const {
switch (i) {
case 0: return _v0;
case 1: return _v1;
case 2: return _v2;
case 3: return _v3;
}
return _v4;
}
};
#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400)
#pragma warning(pop)
#endif
// The following way of casting adjacent channels (the contents of color_base) into an array appears to be unsafe
// -- there is no guarantee that the compiler won't add any padding between adjacent channels.
// Note, however, that GIL _must_ be compiled with compiler settings ensuring there is no padding in the color base structs.
// This is because the color base structs must model the interleaved organization in memory. In other words, the client may
// have existing RGB image in the form "RGBRGBRGB..." and we must be able to represent it with an array of RGB color bases (i.e. RGB pixels)
// with no padding. We have tested with char/int/float/double channels on gcc and VC and have so far discovered no problem.
// We have even tried using strange channels consisting of short + char (3 bytes). With the default 4-byte alignment on VC, the size
// of this channel is padded to 4 bytes, so an RGB pixel of it will be 4x3=12 bytes. The code below will still work properly.
// However, the client must nevertheless ensure that proper compiler settings are used for their compiler and their channel types.
template <typename Element, typename Layout, int K>
typename element_reference_type<homogeneous_color_base<Element,Layout,K> >::type
dynamic_at_c(homogeneous_color_base<Element,Layout,K>& cb, std::size_t i)
{
BOOST_ASSERT(i < K);
return (gil_reinterpret_cast<Element*>(&cb))[i];
}
template <typename Element, typename Layout, int K>
typename element_const_reference_type<homogeneous_color_base<Element,Layout,K> >::type
dynamic_at_c(const homogeneous_color_base<Element,Layout,K>& cb, std::size_t i) {
BOOST_ASSERT(i < K);
return (gil_reinterpret_cast_c<const Element*>(&cb))[i];
}
template <typename Element, typename Layout, int K>
typename element_reference_type<homogeneous_color_base<Element&,Layout,K> >::type
dynamic_at_c(const homogeneous_color_base<Element&,Layout,K>& cb, std::size_t i) {
BOOST_ASSERT(i < K);
return cb.at_c_dynamic(i);
}
template <typename Element, typename Layout, int K>
typename element_const_reference_type<homogeneous_color_base<const Element&,Layout,K> >::type
dynamic_at_c(const homogeneous_color_base<const Element&,Layout,K>& cb, std::size_t i) {
BOOST_ASSERT(i < K);
return cb.at_c_dynamic(i);
}
} // namespace detail
template <typename Element, typename Layout, int K1, int K>
struct kth_element_type<detail::homogeneous_color_base<Element,Layout,K1>, K> {
using type = Element;
};
template <typename Element, typename Layout, int K1, int K>
struct kth_element_reference_type<detail::homogeneous_color_base<Element,Layout,K1>, K> : public add_reference<Element> {};
template <typename Element, typename Layout, int K1, int K>
struct kth_element_const_reference_type<detail::homogeneous_color_base<Element,Layout,K1>, K> : public add_reference<typename add_const<Element>::type> {};
/// \brief Provides mutable access to the K-th element, in physical order
/// \ingroup ColorBaseModelHomogeneous
template <int K, typename E, typename L, int N> inline
typename add_reference<E>::type
at_c( detail::homogeneous_color_base<E,L,N>& p) { return p.at(mpl::int_<K>()); }
/// \brief Provides constant access to the K-th element, in physical order
/// \ingroup ColorBaseModelHomogeneous
template <int K, typename E, typename L, int N> inline
typename add_reference<typename add_const<E>::type>::type
at_c(const detail::homogeneous_color_base<E,L,N>& p) { return p.at(mpl::int_<K>()); }
namespace detail {
struct swap_fn {
template <typename T> void operator()(T& x, T& y) const {
using std::swap;
swap(x,y);
}
};
}
template <typename E, typename L, int N> inline
void swap(detail::homogeneous_color_base<E,L,N>& x, detail::homogeneous_color_base<E,L,N>& y) {
static_for_each(x,y,detail::swap_fn());
}
} } // namespace boost::gil
#endif
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