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332 lines
13 KiB
C++
332 lines
13 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_UTILITIES_H
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#define GIL_UTILITIES_H
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#include "gil_config.hpp"
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#include <functional>
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#include <boost/config/no_tr1/cmath.hpp>
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#include <cstddef>
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#include <algorithm>
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#include <utility>
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#include <iterator>
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#include <boost/static_assert.hpp>
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#include <boost/type_traits.hpp>
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#include <boost/mpl/size.hpp>
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#include <boost/mpl/distance.hpp>
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#include <boost/mpl/begin.hpp>
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#include <boost/mpl/find.hpp>
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#include <boost/mpl/range_c.hpp>
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#include <boost/iterator/iterator_adaptor.hpp>
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#include <boost/iterator/iterator_facade.hpp>
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////////////////////////////////////////////////////////////////////////////////////////
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/// \file
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/// \brief Various utilities not specific to the image library. Some are non-standard STL extensions or generic iterator adaptors
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/// \author Lubomir Bourdev and Hailin Jin \n
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/// Adobe Systems Incorporated
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/// \date 2005-2007 \n Last updated on September 18, 2007
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///
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///
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////////////////////////////////////////////////////////////////////////////////////////
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namespace boost { namespace gil {
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/**
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\addtogroup PointModel
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Example:
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\code
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point2<std::ptrdiff_t> p(3,2);
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assert((p[0] == p.x) && (p[1] == p.y));
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assert(axis_value<0>(p) == 3);
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assert(axis_value<1>(p) == 2);
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\endcode
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*/
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////////////////////////////////////////////////////////////////////////////////////////
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// CLASS point2
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///
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/// \brief 2D point both axes of which have the same dimension type
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/// \ingroup PointModel
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/// Models: Point2DConcept
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///
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////////////////////////////////////////////////////////////////////////////////////////
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template <typename T>
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class point2 {
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public:
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typedef T value_type;
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template <std::size_t D> struct axis { typedef value_type coord_t; };
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static const std::size_t num_dimensions=2;
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point2() : x(0), y(0) {}
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point2(T newX, T newY) : x(newX), y(newY) {}
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point2(const point2& p) : x(p.x), y(p.y) {}
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~point2() {}
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point2& operator=(const point2& p) { x=p.x; y=p.y; return *this; }
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point2 operator<<(std::ptrdiff_t shift) const { return point2(x<<shift,y<<shift); }
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point2 operator>>(std::ptrdiff_t shift) const { return point2(x>>shift,y>>shift); }
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point2& operator+=(const point2& p) { x+=p.x; y+=p.y; return *this; }
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point2& operator-=(const point2& p) { x-=p.x; y-=p.y; return *this; }
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point2& operator/=(double t) { x/=t; y/=t; return *this; }
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const T& operator[](std::size_t i) const { return this->*mem_array[i]; }
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T& operator[](std::size_t i) { return this->*mem_array[i]; }
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T x,y;
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private:
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// this static array of pointers to member variables makes operator[] safe and doesn't seem to exhibit any performance penalty
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static T point2<T>::* const mem_array[num_dimensions];
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};
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template <typename T>
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T point2<T>::* const point2<T>::mem_array[point2<T>::num_dimensions] = { &point2<T>::x, &point2<T>::y };
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/// \ingroup PointModel
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template <typename T> GIL_FORCEINLINE
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bool operator==(const point2<T>& p1, const point2<T>& p2) { return (p1.x==p2.x && p1.y==p2.y); }
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/// \ingroup PointModel
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template <typename T> GIL_FORCEINLINE
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bool operator!=(const point2<T>& p1, const point2<T>& p2) { return p1.x!=p2.x || p1.y!=p2.y; }
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/// \ingroup PointModel
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template <typename T> GIL_FORCEINLINE
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point2<T> operator+(const point2<T>& p1, const point2<T>& p2) { return point2<T>(p1.x+p2.x,p1.y+p2.y); }
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/// \ingroup PointModel
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template <typename T> GIL_FORCEINLINE
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point2<T> operator-(const point2<T>& p) { return point2<T>(-p.x,-p.y); }
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/// \ingroup PointModel
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template <typename T> GIL_FORCEINLINE
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point2<T> operator-(const point2<T>& p1, const point2<T>& p2) { return point2<T>(p1.x-p2.x,p1.y-p2.y); }
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/// \ingroup PointModel
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template <typename T> GIL_FORCEINLINE
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point2<double> operator/(const point2<T>& p, double t) { return t==0 ? point2<double>(0,0):point2<double>(p.x/t,p.y/t); }
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/// \ingroup PointModel
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template <typename T> GIL_FORCEINLINE
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point2<T> operator*(const point2<T>& p, std::ptrdiff_t t) { return point2<T>(p.x*t,p.y*t); }
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/// \ingroup PointModel
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template <typename T> GIL_FORCEINLINE
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point2<T> operator*(std::ptrdiff_t t, const point2<T>& p) { return point2<T>(p.x*t,p.y*t); }
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/// \ingroup PointModel
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template <std::size_t K, typename T> GIL_FORCEINLINE
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const T& axis_value(const point2<T>& p) { return p[K]; }
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/// \ingroup PointModel
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template <std::size_t K, typename T> GIL_FORCEINLINE
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T& axis_value( point2<T>& p) { return p[K]; }
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////////////////////////////////////////////////////////////////////////////////////////
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///
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/// Rounding of real numbers / points to integers / integer points
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///
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////////////////////////////////////////////////////////////////////////////////////////
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inline std::ptrdiff_t iround(float x ) { return static_cast<std::ptrdiff_t>(x + (x < 0.0f ? -0.5f : 0.5f)); }
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inline std::ptrdiff_t iround(double x) { return static_cast<std::ptrdiff_t>(x + (x < 0.0 ? -0.5 : 0.5)); }
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inline std::ptrdiff_t ifloor(float x ) { return static_cast<std::ptrdiff_t>(std::floor(x)); }
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inline std::ptrdiff_t ifloor(double x) { return static_cast<std::ptrdiff_t>(std::floor(x)); }
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inline std::ptrdiff_t iceil(float x ) { return static_cast<std::ptrdiff_t>(std::ceil(x)); }
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inline std::ptrdiff_t iceil(double x) { return static_cast<std::ptrdiff_t>(std::ceil(x)); }
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/**
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\addtogroup PointAlgorithm
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Example:
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\code
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assert(iround(point2<double>(3.1, 3.9)) == point2<std::ptrdiff_t>(3,4));
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\endcode
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*/
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/// \ingroup PointAlgorithm
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inline point2<std::ptrdiff_t> iround(const point2<float >& p) { return point2<std::ptrdiff_t>(iround(p.x),iround(p.y)); }
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/// \ingroup PointAlgorithm
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inline point2<std::ptrdiff_t> iround(const point2<double>& p) { return point2<std::ptrdiff_t>(iround(p.x),iround(p.y)); }
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/// \ingroup PointAlgorithm
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inline point2<std::ptrdiff_t> ifloor(const point2<float >& p) { return point2<std::ptrdiff_t>(ifloor(p.x),ifloor(p.y)); }
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/// \ingroup PointAlgorithm
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inline point2<std::ptrdiff_t> ifloor(const point2<double>& p) { return point2<std::ptrdiff_t>(ifloor(p.x),ifloor(p.y)); }
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/// \ingroup PointAlgorithm
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inline point2<std::ptrdiff_t> iceil (const point2<float >& p) { return point2<std::ptrdiff_t>(iceil(p.x), iceil(p.y)); }
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/// \ingroup PointAlgorithm
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inline point2<std::ptrdiff_t> iceil (const point2<double>& p) { return point2<std::ptrdiff_t>(iceil(p.x), iceil(p.y)); }
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////////////////////////////////////////////////////////////////////////////////////////
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///
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/// computing size with alignment
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///
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////////////////////////////////////////////////////////////////////////////////////////
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template <typename T>
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inline T align(T val, std::size_t alignment) {
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return val+(alignment - val%alignment)%alignment;
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}
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/// \brief Helper base class for pixel dereference adaptors.
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/// \ingroup PixelDereferenceAdaptorModel
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///
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template <typename ConstT, typename Value, typename Reference, typename ConstReference,
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typename ArgType, typename ResultType, bool IsMutable>
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struct deref_base : public std::unary_function<ArgType, ResultType> {
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typedef ConstT const_t;
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typedef Value value_type;
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typedef Reference reference;
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typedef ConstReference const_reference;
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BOOST_STATIC_CONSTANT(bool, is_mutable = IsMutable);
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};
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/// \brief Composes two dereference function objects. Similar to std::unary_compose but needs to pull some typedefs from the component types. Models: PixelDereferenceAdaptorConcept
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/// \ingroup PixelDereferenceAdaptorModel
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///
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template <typename D1, typename D2>
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class deref_compose : public deref_base<
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deref_compose<typename D1::const_t, typename D2::const_t>,
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typename D1::value_type, typename D1::reference, typename D1::const_reference,
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typename D2::argument_type, typename D1::result_type, D1::is_mutable && D2::is_mutable>
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{
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public:
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D1 _fn1;
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D2 _fn2;
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typedef typename D2::argument_type argument_type;
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typedef typename D1::result_type result_type;
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deref_compose() {}
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deref_compose(const D1& x, const D2& y) : _fn1(x), _fn2(y) {}
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deref_compose(const deref_compose& dc) : _fn1(dc._fn1), _fn2(dc._fn2) {}
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template <typename _D1, typename _D2> deref_compose(const deref_compose<_D1,_D2>& dc) : _fn1(dc._fn1), _fn2(dc._fn2) {}
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result_type operator()(argument_type x) const { return _fn1(_fn2(x)); }
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result_type operator()(argument_type x) { return _fn1(_fn2(x)); }
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};
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// reinterpret_cast is implementation-defined. Static cast is not.
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template <typename OutPtr, typename In> GIL_FORCEINLINE
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OutPtr gil_reinterpret_cast( In* p) { return static_cast<OutPtr>(static_cast<void*>(p)); }
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template <typename OutPtr, typename In> GIL_FORCEINLINE
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const OutPtr gil_reinterpret_cast_c(const In* p) { return static_cast<const OutPtr>(static_cast<const void*>(p)); }
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namespace detail {
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////////////////////////////////////////////////////////////////////////////////////////
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///
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/// \brief copy_n taken from SGI STL.
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///
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////////////////////////////////////////////////////////////////////////////////////////
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template <class InputIter, class Size, class OutputIter>
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std::pair<InputIter, OutputIter> _copy_n(InputIter first, Size count,
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OutputIter result,
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std::input_iterator_tag) {
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for ( ; count > 0; --count) {
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*result = *first;
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++first;
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++result;
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}
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return std::pair<InputIter, OutputIter>(first, result);
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}
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template <class RAIter, class Size, class OutputIter>
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inline std::pair<RAIter, OutputIter>
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_copy_n(RAIter first, Size count, OutputIter result, std::random_access_iterator_tag) {
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RAIter last = first + count;
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return std::pair<RAIter, OutputIter>(last, std::copy(first, last, result));
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}
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template <class InputIter, class Size, class OutputIter>
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inline std::pair<InputIter, OutputIter>
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_copy_n(InputIter first, Size count, OutputIter result) {
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return _copy_n(first, count, result, typename std::iterator_traits<InputIter>::iterator_category());
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}
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template <class InputIter, class Size, class OutputIter>
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inline std::pair<InputIter, OutputIter>
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copy_n(InputIter first, Size count, OutputIter result) {
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return detail::_copy_n(first, count, result);
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}
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/// \brief identity taken from SGI STL.
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template <typename T>
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struct identity : public std::unary_function<T,T> {
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const T& operator()(const T& val) const { return val; }
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};
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/*************************************************************************************************/
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/// \brief plus function object whose arguments may be of different type.
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template <typename T1, typename T2>
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struct plus_asymmetric : public std::binary_function<T1,T2,T1> {
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T1 operator()(T1 f1, T2 f2) const {
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return f1+f2;
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}
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};
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/*************************************************************************************************/
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/// \brief operator++ wrapped in a function object
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template <typename T>
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struct inc : public std::unary_function<T,T> {
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T operator()(T x) const { return ++x; }
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};
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/*************************************************************************************************/
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/// \brief operator-- wrapped in a function object
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template <typename T>
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struct dec : public std::unary_function<T,T> {
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T operator()(T x) const { return --x; }
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};
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/// \brief Returns the index corresponding to the first occurrance of a given given type in
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// a given MPL RandomAccessSequence (or size if the type is not present)
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template <typename Types, typename T>
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struct type_to_index
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: public mpl::distance<typename mpl::begin<Types>::type,
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typename mpl::find<Types,T>::type>::type {};
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} // namespace detail
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/// \ingroup ColorSpaceAndLayoutModel
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/// \brief Represents a color space and ordering of channels in memory
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template <typename ColorSpace, typename ChannelMapping = mpl::range_c<int,0,mpl::size<ColorSpace>::value> >
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struct layout {
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typedef ColorSpace color_space_t;
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typedef ChannelMapping channel_mapping_t;
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};
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/// \brief A version of swap that also works with reference proxy objects
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template <typename Value, typename T1, typename T2> // where value_type<T1> == value_type<T2> == Value
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void swap_proxy(T1& left, T2& right) {
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Value tmp = left;
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left = right;
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right = tmp;
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}
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/// \brief Run-time detection of whether the underlying architecture is little endian
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inline bool little_endian() {
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short tester = 0x0001;
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return *(char*)&tester!=0;
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}
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/// \brief Run-time detection of whether the underlying architecture is big endian
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inline bool big_endian() {
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return !little_endian();
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}
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} } // namespace boost::gil
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#endif
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