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227 lines
10 KiB
227 lines
10 KiB
/* |
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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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