228 lines
10 KiB
C++
228 lines
10 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_PLANAR_PTR_H
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#define GIL_PLANAR_PTR_H
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////////////////////////////////////////////////////////////////////////////////////////
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/// \file
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/// \brief planar pixel pointer class
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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 February 12, 2007
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///
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////////////////////////////////////////////////////////////////////////////////////////
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#include <cassert>
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#include <iterator>
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#include <boost/iterator/iterator_facade.hpp>
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#include "gil_config.hpp"
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#include "pixel.hpp"
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#include "step_iterator.hpp"
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namespace boost { namespace gil {
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//forward declaration (as this file is included in planar_pixel_reference.hpp)
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template <typename ChannelReference, typename ColorSpace>
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struct planar_pixel_reference;
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/// \defgroup ColorBaseModelPlanarPtr planar_pixel_iterator
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/// \ingroup ColorBaseModel
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/// \brief A homogeneous color base whose element is a channel iterator. Models HomogeneousColorBaseValueConcept
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/// This class is used as an iterator to a planar pixel.
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/// \defgroup PixelIteratorModelPlanarPtr planar_pixel_iterator
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/// \ingroup PixelIteratorModel
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/// \brief An iterator over planar pixels. Models PixelIteratorConcept, HomogeneousPixelBasedConcept, MemoryBasedIteratorConcept, HasDynamicXStepTypeConcept
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////////////////////////////////////////////////////////////////////////////////////////
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/// \brief An iterator over planar pixels. Models HomogeneousColorBaseConcept, PixelIteratorConcept, HomogeneousPixelBasedConcept, MemoryBasedIteratorConcept, HasDynamicXStepTypeConcept
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///
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/// Planar pixels have channel data that is not consecutive in memory.
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/// To abstract this we use classes to represent references and pointers to planar pixels.
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///
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/// \ingroup PixelIteratorModelPlanarPtr ColorBaseModelPlanarPtr PixelBasedModel
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template <typename ChannelPtr, typename ColorSpace>
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struct planar_pixel_iterator : public iterator_facade<planar_pixel_iterator<ChannelPtr,ColorSpace>,
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pixel<typename std::iterator_traits<ChannelPtr>::value_type,layout<ColorSpace> >,
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std::random_access_iterator_tag,
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const planar_pixel_reference<typename std::iterator_traits<ChannelPtr>::reference,ColorSpace> >,
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public detail::homogeneous_color_base<ChannelPtr,layout<ColorSpace>,mpl::size<ColorSpace>::value > {
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private:
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typedef iterator_facade<planar_pixel_iterator<ChannelPtr,ColorSpace>,
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pixel<typename std::iterator_traits<ChannelPtr>::value_type,layout<ColorSpace> >,
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std::random_access_iterator_tag,
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const planar_pixel_reference<typename std::iterator_traits<ChannelPtr>::reference,ColorSpace> > parent_t;
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typedef detail::homogeneous_color_base<ChannelPtr,layout<ColorSpace>,mpl::size<ColorSpace>::value> color_base_parent_t;
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typedef typename std::iterator_traits<ChannelPtr>::value_type channel_t;
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public:
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typedef typename parent_t::value_type value_type;
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typedef typename parent_t::reference reference;
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typedef typename parent_t::difference_type difference_type;
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planar_pixel_iterator() : color_base_parent_t(0) {}
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planar_pixel_iterator(bool) {} // constructor that does not fill with zero (for performance)
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planar_pixel_iterator(const ChannelPtr& v0, const ChannelPtr& v1) : color_base_parent_t(v0,v1) {}
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planar_pixel_iterator(const ChannelPtr& v0, const ChannelPtr& v1, const ChannelPtr& v2) : color_base_parent_t(v0,v1,v2) {}
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planar_pixel_iterator(const ChannelPtr& v0, const ChannelPtr& v1, const ChannelPtr& v2, const ChannelPtr& v3) : color_base_parent_t(v0,v1,v2,v3) {}
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planar_pixel_iterator(const ChannelPtr& v0, const ChannelPtr& v1, const ChannelPtr& v2, const ChannelPtr& v3, const ChannelPtr& v4) : color_base_parent_t(v0,v1,v2,v3,v4) {}
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template <typename IC1,typename C1>
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planar_pixel_iterator(const planar_pixel_iterator<IC1,C1>& ptr) : color_base_parent_t(ptr) {}
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/// Copy constructor and operator= from pointers to compatible planar pixels or planar pixel references.
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/// That allow constructs like pointer = &value or pointer = &reference
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/// Since we should not override operator& that's the best we can do.
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template <typename P>
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planar_pixel_iterator(P* pix) : color_base_parent_t(pix, true) {
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function_requires<PixelsCompatibleConcept<P,value_type> >();
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}
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struct address_of { template <typename T> T* operator()(T& t) { return &t; } };
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template <typename P>
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planar_pixel_iterator& operator=(P* pix) {
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function_requires<PixelsCompatibleConcept<P,value_type> >();
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static_transform(*pix,*this, address_of());
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// PERFORMANCE_CHECK: Compare to this:
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//this->template semantic_at_c<0>()=&pix->template semantic_at_c<0>();
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//this->template semantic_at_c<1>()=&pix->template semantic_at_c<1>();
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//this->template semantic_at_c<2>()=&pix->template semantic_at_c<2>();
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return *this;
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}
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/// For some reason operator[] provided by iterator_facade returns a custom class that is convertible to reference
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/// We require our own reference because it is registered in iterator_traits
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reference operator[](difference_type d) const { return memunit_advanced_ref(*this,d*sizeof(channel_t));}
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reference operator->() const { return **this; }
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// PERFORMANCE_CHECK: Remove?
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bool operator< (const planar_pixel_iterator& ptr) const { return gil::at_c<0>(*this)< gil::at_c<0>(ptr); }
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bool operator!=(const planar_pixel_iterator& ptr) const { return gil::at_c<0>(*this)!=gil::at_c<0>(ptr); }
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private:
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friend class boost::iterator_core_access;
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void increment() { static_transform(*this,*this,detail::inc<ChannelPtr>()); }
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void decrement() { static_transform(*this,*this,detail::dec<ChannelPtr>()); }
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void advance(ptrdiff_t d) { static_transform(*this,*this,std::bind2nd(detail::plus_asymmetric<ChannelPtr,ptrdiff_t>(),d)); }
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reference dereference() const { return this->template deref<reference>(); }
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ptrdiff_t distance_to(const planar_pixel_iterator& it) const { return gil::at_c<0>(it)-gil::at_c<0>(*this); }
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bool equal(const planar_pixel_iterator& it) const { return gil::at_c<0>(*this)==gil::at_c<0>(it); }
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};
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namespace detail {
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template <typename IC> struct channel_iterator_is_mutable : public mpl::true_ {};
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template <typename T> struct channel_iterator_is_mutable<const T*> : public mpl::false_ {};
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}
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template <typename IC, typename C>
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struct const_iterator_type<planar_pixel_iterator<IC,C> > {
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private:
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typedef typename std::iterator_traits<IC>::value_type channel_t;
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public:
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typedef planar_pixel_iterator<typename channel_traits<channel_t>::const_pointer,C> type;
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};
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// The default implementation when the iterator is a C pointer is to use the standard constness semantics
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template <typename IC, typename C>
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struct iterator_is_mutable<planar_pixel_iterator<IC,C> > : public detail::channel_iterator_is_mutable<IC> {};
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/////////////////////////////
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// ColorBasedConcept
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/////////////////////////////
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template <typename IC, typename C, int K>
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struct kth_element_type<planar_pixel_iterator<IC,C>, K> {
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typedef IC type;
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};
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template <typename IC, typename C, int K>
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struct kth_element_reference_type<planar_pixel_iterator<IC,C>, K> : public add_reference<IC> {};
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template <typename IC, typename C, int K>
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struct kth_element_const_reference_type<planar_pixel_iterator<IC,C>, K> : public add_reference<typename add_const<IC>::type> {};
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/////////////////////////////
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// HomogeneousPixelBasedConcept
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/////////////////////////////
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template <typename IC, typename C>
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struct color_space_type<planar_pixel_iterator<IC,C> > {
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typedef C type;
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};
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template <typename IC, typename C>
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struct channel_mapping_type<planar_pixel_iterator<IC,C> > : public channel_mapping_type<typename planar_pixel_iterator<IC,C>::value_type> {};
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template <typename IC, typename C>
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struct is_planar<planar_pixel_iterator<IC,C> > : public mpl::true_ {};
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template <typename IC, typename C>
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struct channel_type<planar_pixel_iterator<IC,C> > {
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typedef typename std::iterator_traits<IC>::value_type type;
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};
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/////////////////////////////
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// MemoryBasedIteratorConcept
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/////////////////////////////
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template <typename IC, typename C>
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inline std::ptrdiff_t memunit_step(const planar_pixel_iterator<IC,C>&) { return sizeof(typename std::iterator_traits<IC>::value_type); }
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template <typename IC, typename C>
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inline std::ptrdiff_t memunit_distance(const planar_pixel_iterator<IC,C>& p1, const planar_pixel_iterator<IC,C>& p2) {
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return memunit_distance(gil::at_c<0>(p1),gil::at_c<0>(p2));
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}
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template <typename IC>
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struct memunit_advance_fn {
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memunit_advance_fn(std::ptrdiff_t diff) : _diff(diff) {}
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IC operator()(const IC& p) const { return memunit_advanced(p,_diff); }
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std::ptrdiff_t _diff;
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};
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template <typename IC, typename C>
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inline void memunit_advance(planar_pixel_iterator<IC,C>& p, std::ptrdiff_t diff) {
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static_transform(p, p, memunit_advance_fn<IC>(diff));
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}
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template <typename IC, typename C>
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inline planar_pixel_iterator<IC,C> memunit_advanced(const planar_pixel_iterator<IC,C>& p, std::ptrdiff_t diff) {
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planar_pixel_iterator<IC,C> ret=p;
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memunit_advance(ret, diff);
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return ret;
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}
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template <typename ChannelPtr, typename ColorSpace>
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inline planar_pixel_reference<typename std::iterator_traits<ChannelPtr>::reference,ColorSpace>
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memunit_advanced_ref(const planar_pixel_iterator<ChannelPtr,ColorSpace>& ptr, std::ptrdiff_t diff) {
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return planar_pixel_reference<typename std::iterator_traits<ChannelPtr>::reference,ColorSpace>(ptr, diff);
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}
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/////////////////////////////
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// HasDynamicXStepTypeConcept
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/////////////////////////////
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template <typename IC, typename C>
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struct dynamic_x_step_type<planar_pixel_iterator<IC,C> > {
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typedef memory_based_step_iterator<planar_pixel_iterator<IC,C> > type;
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};
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} } // namespace boost::gil
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#endif
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