bit_aligned_pixel_iterator.hpp Go to the documentation of this file. /* Copyright 2005-2007 Adobe Systems Incorporated Use, modification and distribution are subject to 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). See http://opensource.adobe.com/gil for most recent version including documentation. */ /*************************************************************************************************/ #ifndef GIL_BIT_ALIGNED_PIXEL_ITERATOR_HPP #define GIL_BIT_ALIGNED_PIXEL_ITERATOR_HPP #include <functional> #include <boost/iterator/iterator_facade.hpp> #include "gil_config.hpp" #include "bit_aligned_pixel_reference.hpp" namespace boost { namespace gil { template <typename NonAlignedPixelReference> struct bit_aligned_pixel_iterator : public iterator_facade<bit_aligned_pixel_iterator<NonAlignedPixelReference>, typename NonAlignedPixelReference::value_type, random_access_traversal_tag, const NonAlignedPixelReference, typename NonAlignedPixelReference::bit_range_t::difference_type> { private: typedef iterator_facade<bit_aligned_pixel_iterator<NonAlignedPixelReference>, typename NonAlignedPixelReference::value_type, random_access_traversal_tag, const NonAlignedPixelReference, typename NonAlignedPixelReference::bit_range_t::difference_type> parent_t; template <typename Ref> friend struct bit_aligned_pixel_iterator; typedef typename NonAlignedPixelReference::bit_range_t bit_range_t; public: typedef typename parent_t::difference_type difference_type; typedef typename parent_t::reference reference; bit_aligned_pixel_iterator() {} bit_aligned_pixel_iterator(const bit_aligned_pixel_iterator& p) : _bit_range(p._bit_range) {} bit_aligned_pixel_iterator& operator=(const bit_aligned_pixel_iterator& p) { _bit_range=p._bit_range; return *this; } template <typename Ref> bit_aligned_pixel_iterator(const bit_aligned_pixel_iterator<Ref>& p) : _bit_range(p._bit_range) {} bit_aligned_pixel_iterator(reference* ref) : _bit_range(ref->bit_range()) {} explicit bit_aligned_pixel_iterator(typename bit_range_t::byte_t* data, int bit_offset=0) : _bit_range(data,bit_offset) {} reference operator[](difference_type d) const { bit_aligned_pixel_iterator it=*this; it.advance(d); return *it; } reference operator->() const { return **this; } const bit_range_t& bit_range() const { return _bit_range; } bit_range_t& bit_range() { return _bit_range; } private: bit_range_t _bit_range; BOOST_STATIC_CONSTANT(int, bit_size = NonAlignedPixelReference::bit_size); friend class boost::iterator_core_access; reference dereference() const { return NonAlignedPixelReference(_bit_range); } void increment() { ++_bit_range; } void decrement() { --_bit_range; } void advance(difference_type d) { _bit_range.bit_advance(d*bit_size); } difference_type distance_to(const bit_aligned_pixel_iterator& it) const { return _bit_range.bit_distance_to(it._bit_range) / bit_size; } bool equal(const bit_aligned_pixel_iterator& it) const { return _bit_range==it._bit_range; } }; template <typename NonAlignedPixelReference> struct const_iterator_type<bit_aligned_pixel_iterator<NonAlignedPixelReference> > { typedef bit_aligned_pixel_iterator<typename NonAlignedPixelReference::const_reference> type; }; template <typename NonAlignedPixelReference> struct iterator_is_mutable<bit_aligned_pixel_iterator<NonAlignedPixelReference> > : public mpl::bool_<NonAlignedPixelReference::is_mutable> {}; template <typename NonAlignedPixelReference> struct is_iterator_adaptor<bit_aligned_pixel_iterator<NonAlignedPixelReference> > : public mpl::false_ {}; // PixelBasedConcept template <typename NonAlignedPixelReference> struct color_space_type<bit_aligned_pixel_iterator<NonAlignedPixelReference> > : public color_space_type<NonAlignedPixelReference> {}; template <typename NonAlignedPixelReference> struct channel_mapping_type<bit_aligned_pixel_iterator<NonAlignedPixelReference> > : public channel_mapping_type<NonAlignedPixelReference> {}; template <typename NonAlignedPixelReference> struct is_planar<bit_aligned_pixel_iterator<NonAlignedPixelReference> > : public is_planar<NonAlignedPixelReference> {}; // == false // MemoryBasedIteratorConcept template <typename NonAlignedPixelReference> struct byte_to_memunit<bit_aligned_pixel_iterator<NonAlignedPixelReference> > : public mpl::int_<8> {}; template <typename NonAlignedPixelReference> inline std::ptrdiff_t memunit_step(const bit_aligned_pixel_iterator<NonAlignedPixelReference>&) { return NonAlignedPixelReference::bit_size; } template <typename NonAlignedPixelReference> inline std::ptrdiff_t memunit_distance(const bit_aligned_pixel_iterator<NonAlignedPixelReference>& p1, const bit_aligned_pixel_iterator<NonAlignedPixelReference>& p2) { return (p2.bit_range().current_byte() - p1.bit_range().current_byte())*8 + p2.bit_range().bit_offset() - p1.bit_range().bit_offset(); } template <typename NonAlignedPixelReference> inline void memunit_advance(bit_aligned_pixel_iterator<NonAlignedPixelReference>& p, std::ptrdiff_t diff) { p.bit_range().bit_advance(diff); } template <typename NonAlignedPixelReference> inline bit_aligned_pixel_iterator<NonAlignedPixelReference> memunit_advanced(const bit_aligned_pixel_iterator<NonAlignedPixelReference>& p, std::ptrdiff_t diff) { bit_aligned_pixel_iterator<NonAlignedPixelReference> ret=p; memunit_advance(ret, diff); return ret; } template <typename NonAlignedPixelReference> inline NonAlignedPixelReference memunit_advanced_ref(bit_aligned_pixel_iterator<NonAlignedPixelReference> it, std::ptrdiff_t diff) { return *memunit_advanced(it,diff); } // HasDynamicXStepTypeConcept template <typename NonAlignedPixelReference> struct dynamic_x_step_type<bit_aligned_pixel_iterator<NonAlignedPixelReference> > { typedef memory_based_step_iterator<bit_aligned_pixel_iterator<NonAlignedPixelReference> > type; }; // iterator_type_from_pixel template <typename C, typename L, bool M> struct iterator_type_from_pixel<const bit_aligned_pixel_reference<C,L,M>,false,false,false> { typedef bit_aligned_pixel_iterator<bit_aligned_pixel_reference<C,L,false> > type; }; template <typename C, typename L, bool M> struct iterator_type_from_pixel<const bit_aligned_pixel_reference<C,L,M>,false,false,true> { typedef bit_aligned_pixel_iterator<bit_aligned_pixel_reference<C,L,true> > type; }; template <typename C, typename L, bool M, bool IsPlanar, bool IsStep, bool IsMutable> struct iterator_type_from_pixel<bit_aligned_pixel_reference<C,L,M>,IsPlanar,IsStep,IsMutable> : public iterator_type_from_pixel<const bit_aligned_pixel_reference<C,L,M>,IsPlanar,IsStep,IsMutable> {}; } } // namespace boost::gil namespace std { // It is important to provide an overload of uninitialized_copy for bit_aligned_pixel_iterator. The default STL implementation calls placement new, // which is not defined for bit_aligned_pixel_iterator. template <typename NonAlignedPixelReference> boost::gil::bit_aligned_pixel_iterator<NonAlignedPixelReference> uninitialized_copy(boost::gil::bit_aligned_pixel_iterator<NonAlignedPixelReference> first, boost::gil::bit_aligned_pixel_iterator<NonAlignedPixelReference> last, boost::gil::bit_aligned_pixel_iterator<NonAlignedPixelReference> dst) { return std::copy(first,last,dst); } } // namespace std #endif

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