bit_aligned_pixel_iterator.hppGo to the documentation of this file.00001 /* 00002 Copyright 2005-2007 Adobe Systems Incorporated 00003 00004 Use, modification and distribution are subject to the Boost Software License, 00005 Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at 00006 http://www.boost.org/LICENSE_1_0.txt). 00007 00008 See http://opensource.adobe.com/gil for most recent version including documentation. 00009 */ 00010 00011 /*************************************************************************************************/ 00012 00013 #ifndef GIL_BIT_ALIGNED_PIXEL_ITERATOR_HPP 00014 #define GIL_BIT_ALIGNED_PIXEL_ITERATOR_HPP 00015 00024 00025 #include <functional> 00026 #include <boost/iterator/iterator_facade.hpp> 00027 #include "gil_config.hpp" 00028 #include "bit_aligned_pixel_reference.hpp" 00029 00030 namespace boost { namespace gil { 00031 00035 00042 00043 template <typename NonAlignedPixelReference> 00044 struct bit_aligned_pixel_iterator : public iterator_facade<bit_aligned_pixel_iterator<NonAlignedPixelReference>, 00045 typename NonAlignedPixelReference::value_type, 00046 random_access_traversal_tag, 00047 const NonAlignedPixelReference, 00048 typename NonAlignedPixelReference::bit_range_t::difference_type> { 00049 private: 00050 typedef iterator_facade<bit_aligned_pixel_iterator<NonAlignedPixelReference>, 00051 typename NonAlignedPixelReference::value_type, 00052 random_access_traversal_tag, 00053 const NonAlignedPixelReference, 00054 typename NonAlignedPixelReference::bit_range_t::difference_type> parent_t; 00055 template <typename Ref> friend struct bit_aligned_pixel_iterator; 00056 00057 typedef typename NonAlignedPixelReference::bit_range_t bit_range_t; 00058 public: 00059 typedef typename parent_t::difference_type difference_type; 00060 typedef typename parent_t::reference reference; 00061 00062 bit_aligned_pixel_iterator() {} 00063 bit_aligned_pixel_iterator(const bit_aligned_pixel_iterator& p) : _bit_range(p._bit_range) {} 00064 bit_aligned_pixel_iterator& operator=(const bit_aligned_pixel_iterator& p) { _bit_range=p._bit_range; return *this; } 00065 00066 template <typename Ref> bit_aligned_pixel_iterator(const bit_aligned_pixel_iterator<Ref>& p) : _bit_range(p._bit_range) {} 00067 00068 bit_aligned_pixel_iterator(reference* ref) : _bit_range(ref->bit_range()) {} 00069 explicit bit_aligned_pixel_iterator(typename bit_range_t::byte_t* data, int bit_offset=0) : _bit_range(data,bit_offset) {} 00070 00073 reference operator[](difference_type d) const { bit_aligned_pixel_iterator it=*this; it.advance(d); return *it; } 00074 00075 reference operator->() const { return **this; } 00076 const bit_range_t& bit_range() const { return _bit_range; } 00077 bit_range_t& bit_range() { return _bit_range; } 00078 private: 00079 bit_range_t _bit_range; 00080 BOOST_STATIC_CONSTANT(int, bit_size = NonAlignedPixelReference::bit_size); 00081 00082 friend class boost::iterator_core_access; 00083 reference dereference() const { return NonAlignedPixelReference(_bit_range); } 00084 void increment() { ++_bit_range; } 00085 void decrement() { --_bit_range; } 00086 void advance(difference_type d) { _bit_range.bit_advance(d*bit_size); } 00087 00088 difference_type distance_to(const bit_aligned_pixel_iterator& it) const { return _bit_range.bit_distance_to(it._bit_range) / bit_size; } 00089 bool equal(const bit_aligned_pixel_iterator& it) const { return _bit_range==it._bit_range; } 00090 }; 00091 00092 template <typename NonAlignedPixelReference> 00093 struct const_iterator_type<bit_aligned_pixel_iterator<NonAlignedPixelReference> > { 00094 typedef bit_aligned_pixel_iterator<typename NonAlignedPixelReference::const_reference> type; 00095 }; 00096 00097 template <typename NonAlignedPixelReference> 00098 struct iterator_is_mutable<bit_aligned_pixel_iterator<NonAlignedPixelReference> > : public mpl::bool_<NonAlignedPixelReference::is_mutable> {}; 00099 00100 template <typename NonAlignedPixelReference> 00101 struct is_iterator_adaptor<bit_aligned_pixel_iterator<NonAlignedPixelReference> > : public mpl::false_ {}; 00102 00104 // PixelBasedConcept 00106 00107 template <typename NonAlignedPixelReference> 00108 struct color_space_type<bit_aligned_pixel_iterator<NonAlignedPixelReference> > : public color_space_type<NonAlignedPixelReference> {}; 00109 00110 template <typename NonAlignedPixelReference> 00111 struct channel_mapping_type<bit_aligned_pixel_iterator<NonAlignedPixelReference> > : public channel_mapping_type<NonAlignedPixelReference> {}; 00112 00113 template <typename NonAlignedPixelReference> 00114 struct is_planar<bit_aligned_pixel_iterator<NonAlignedPixelReference> > : public is_planar<NonAlignedPixelReference> {}; // == false 00115 00117 // MemoryBasedIteratorConcept 00119 00120 template <typename NonAlignedPixelReference> 00121 struct byte_to_memunit<bit_aligned_pixel_iterator<NonAlignedPixelReference> > : public mpl::int_<8> {}; 00122 00123 template <typename NonAlignedPixelReference> 00124 inline std::ptrdiff_t memunit_step(const bit_aligned_pixel_iterator<NonAlignedPixelReference>&) { 00125 return NonAlignedPixelReference::bit_size; 00126 } 00127 00128 template <typename NonAlignedPixelReference> 00129 inline std::ptrdiff_t memunit_distance(const bit_aligned_pixel_iterator<NonAlignedPixelReference>& p1, const bit_aligned_pixel_iterator<NonAlignedPixelReference>& p2) { 00130 return (p2.bit_range().current_byte() - p1.bit_range().current_byte())*8 + p2.bit_range().bit_offset() - p1.bit_range().bit_offset(); 00131 } 00132 00133 template <typename NonAlignedPixelReference> 00134 inline void memunit_advance(bit_aligned_pixel_iterator<NonAlignedPixelReference>& p, std::ptrdiff_t diff) { 00135 p.bit_range().bit_advance(diff); 00136 } 00137 00138 template <typename NonAlignedPixelReference> 00139 inline bit_aligned_pixel_iterator<NonAlignedPixelReference> memunit_advanced(const bit_aligned_pixel_iterator<NonAlignedPixelReference>& p, std::ptrdiff_t diff) { 00140 bit_aligned_pixel_iterator<NonAlignedPixelReference> ret=p; 00141 memunit_advance(ret, diff); 00142 return ret; 00143 } 00144 00145 template <typename NonAlignedPixelReference> inline 00146 NonAlignedPixelReference memunit_advanced_ref(bit_aligned_pixel_iterator<NonAlignedPixelReference> it, std::ptrdiff_t diff) { 00147 return *memunit_advanced(it,diff); 00148 } 00150 // HasDynamicXStepTypeConcept 00152 00153 template <typename NonAlignedPixelReference> 00154 struct dynamic_x_step_type<bit_aligned_pixel_iterator<NonAlignedPixelReference> > { 00155 typedef memory_based_step_iterator<bit_aligned_pixel_iterator<NonAlignedPixelReference> > type; 00156 }; 00157 00159 // iterator_type_from_pixel 00161 00162 template <typename C, typename L, bool M> 00163 struct iterator_type_from_pixel<const bit_aligned_pixel_reference<C,L,M>,false,false,false> { 00164 typedef bit_aligned_pixel_iterator<bit_aligned_pixel_reference<C,L,false> > type; 00165 }; 00166 00167 template <typename C, typename L, bool M> 00168 struct iterator_type_from_pixel<const bit_aligned_pixel_reference<C,L,M>,false,false,true> { 00169 typedef bit_aligned_pixel_iterator<bit_aligned_pixel_reference<C,L,true> > type; 00170 }; 00171 00172 template <typename C, typename L, bool M, bool IsPlanar, bool IsStep, bool IsMutable> 00173 struct iterator_type_from_pixel<bit_aligned_pixel_reference<C,L,M>,IsPlanar,IsStep,IsMutable> 00174 : public iterator_type_from_pixel<const bit_aligned_pixel_reference<C,L,M>,IsPlanar,IsStep,IsMutable> {}; 00175 00176 } } // namespace boost::gil 00177 00178 namespace std { 00179 00180 // It is important to provide an overload of uninitialized_copy for bit_aligned_pixel_iterator. The default STL implementation calls placement new, 00181 // which is not defined for bit_aligned_pixel_iterator. 00182 template <typename NonAlignedPixelReference> 00183 boost::gil::bit_aligned_pixel_iterator<NonAlignedPixelReference> uninitialized_copy(boost::gil::bit_aligned_pixel_iterator<NonAlignedPixelReference> first, 00184 boost::gil::bit_aligned_pixel_iterator<NonAlignedPixelReference> last, 00185 boost::gil::bit_aligned_pixel_iterator<NonAlignedPixelReference> dst) { 00186 return std::copy(first,last,dst); 00187 } 00188 00189 } // namespace std 00190 #endif Generated on Thu Nov 8 21:53:16 2007 for Generic Image Library by 1.4.4 |