13 #ifndef GIL_BIT_ALIGNED_PIXEL_ITERATOR_HPP
14 #define GIL_BIT_ALIGNED_PIXEL_ITERATOR_HPP
27 #include <boost/config.hpp>
28 #include <boost/iterator/iterator_facade.hpp>
34 namespace boost {
namespace gil {
47 template <
typename NonAlignedPixelReference>
49 typename NonAlignedPixelReference::value_type,
50 std::random_access_iterator_tag,
51 const NonAlignedPixelReference,
52 typename NonAlignedPixelReference::bit_range_t::difference_type> {
54 typedef iterator_facade<bit_aligned_pixel_iterator<NonAlignedPixelReference>,
55 typename NonAlignedPixelReference::value_type,
56 std::random_access_iterator_tag,
57 const NonAlignedPixelReference,
58 typename NonAlignedPixelReference::bit_range_t::difference_type> parent_t;
61 typedef typename NonAlignedPixelReference::bit_range_t bit_range_t;
63 typedef typename parent_t::difference_type difference_type;
64 typedef typename parent_t::reference reference;
79 reference operator->()
const {
return **
this; }
80 const bit_range_t& bit_range()
const {
return _bit_range; }
81 bit_range_t& bit_range() {
return _bit_range; }
83 bit_range_t _bit_range;
84 BOOST_STATIC_CONSTANT(
int, bit_size = NonAlignedPixelReference::bit_size);
86 friend class boost::iterator_core_access;
87 reference dereference()
const {
return NonAlignedPixelReference(_bit_range); }
88 void increment() { ++_bit_range; }
89 void decrement() { --_bit_range; }
90 void advance(difference_type d) { _bit_range.bit_advance(d*bit_size); }
92 difference_type distance_to(
const bit_aligned_pixel_iterator& it)
const {
return _bit_range.bit_distance_to(it._bit_range) / bit_size; }
93 bool equal(
const bit_aligned_pixel_iterator& it)
const {
return _bit_range==it._bit_range; }
96 template <
typename NonAlignedPixelReference>
97 struct const_iterator_type<bit_aligned_pixel_iterator<NonAlignedPixelReference> > {
98 typedef bit_aligned_pixel_iterator<typename NonAlignedPixelReference::const_reference> type;
101 template <
typename NonAlignedPixelReference>
102 struct iterator_is_mutable<bit_aligned_pixel_iterator<NonAlignedPixelReference> > :
public mpl::bool_<NonAlignedPixelReference::is_mutable> {};
104 template <
typename NonAlignedPixelReference>
105 struct is_iterator_adaptor<bit_aligned_pixel_iterator<NonAlignedPixelReference> > :
public mpl::false_ {};
111 template <
typename NonAlignedPixelReference>
112 struct color_space_type<bit_aligned_pixel_iterator<NonAlignedPixelReference> > :
public color_space_type<NonAlignedPixelReference> {};
114 template <
typename NonAlignedPixelReference>
115 struct channel_mapping_type<bit_aligned_pixel_iterator<NonAlignedPixelReference> > :
public channel_mapping_type<NonAlignedPixelReference> {};
117 template <
typename NonAlignedPixelReference>
118 struct is_planar<bit_aligned_pixel_iterator<NonAlignedPixelReference> > :
public is_planar<NonAlignedPixelReference> {};
124 template <
typename NonAlignedPixelReference>
125 struct byte_to_memunit<bit_aligned_pixel_iterator<NonAlignedPixelReference> > :
public mpl::int_<8> {};
127 template <
typename NonAlignedPixelReference>
128 inline std::ptrdiff_t memunit_step(
const bit_aligned_pixel_iterator<NonAlignedPixelReference>&) {
129 return NonAlignedPixelReference::bit_size;
132 template <
typename NonAlignedPixelReference>
133 inline std::ptrdiff_t memunit_distance(
const bit_aligned_pixel_iterator<NonAlignedPixelReference>& p1,
const bit_aligned_pixel_iterator<NonAlignedPixelReference>& p2) {
134 return (p2.bit_range().current_byte() - p1.bit_range().current_byte())*8 + p2.bit_range().bit_offset() - p1.bit_range().bit_offset();
137 template <
typename NonAlignedPixelReference>
138 inline void memunit_advance(bit_aligned_pixel_iterator<NonAlignedPixelReference>& p, std::ptrdiff_t diff) {
139 p.bit_range().bit_advance(diff);
142 template <
typename NonAlignedPixelReference>
143 inline bit_aligned_pixel_iterator<NonAlignedPixelReference> memunit_advanced(
const bit_aligned_pixel_iterator<NonAlignedPixelReference>& p, std::ptrdiff_t diff) {
144 bit_aligned_pixel_iterator<NonAlignedPixelReference> ret=p;
145 memunit_advance(ret, diff);
149 template <
typename NonAlignedPixelReference>
inline
150 NonAlignedPixelReference memunit_advanced_ref(bit_aligned_pixel_iterator<NonAlignedPixelReference> it, std::ptrdiff_t diff) {
151 return *memunit_advanced(it,diff);
157 template <
typename NonAlignedPixelReference>
158 struct dynamic_x_step_type<bit_aligned_pixel_iterator<NonAlignedPixelReference> > {
159 typedef memory_based_step_iterator<bit_aligned_pixel_iterator<NonAlignedPixelReference> > type;
166 template <
typename B,
typename C,
typename L,
bool M>
167 struct iterator_type_from_pixel<const bit_aligned_pixel_reference<B,C,L,M>,false,false,false> {
168 typedef bit_aligned_pixel_iterator<bit_aligned_pixel_reference<B,C,L,false> > type;
171 template <
typename B,
typename C,
typename L,
bool M>
172 struct iterator_type_from_pixel<const bit_aligned_pixel_reference<B,C,L,M>,false,false,true> {
173 typedef bit_aligned_pixel_iterator<bit_aligned_pixel_reference<B,C,L,true> > type;
176 template <
typename B,
typename C,
typename L,
bool M,
bool IsPlanar,
bool IsStep,
bool IsMutable>
177 struct iterator_type_from_pixel<bit_aligned_pixel_reference<B,C,L,M>,IsPlanar,IsStep,IsMutable>
178 :
public iterator_type_from_pixel<const bit_aligned_pixel_reference<B,C,L,M>,IsPlanar,IsStep,IsMutable> {};
186 template <
typename NonAlignedPixelReference>
BOOST_FORCEINLINE boost::gil::pixel< T, Cs > * copy(boost::gil::pixel< T, Cs > *first, boost::gil::pixel< T, Cs > *last, boost::gil::pixel< T, Cs > *dst)
Copy when both src and dst are interleaved and of the same type can be just memmove.
Definition: algorithm.hpp:151
An iterator over non-byte-aligned pixels. Models PixelIteratorConcept, PixelBasedConcept, MemoryBasedIteratorConcept, HasDynamicXStepTypeConcept.
Definition: bit_aligned_pixel_iterator.hpp:48
reference operator[](difference_type d) const
Definition: bit_aligned_pixel_iterator.hpp:77
BOOST_FORCEINLINE bool equal(boost::gil::iterator_from_2d< Loc1 > first, boost::gil::iterator_from_2d< Loc1 > last, boost::gil::iterator_from_2d< Loc2 > first2)
std::equal(I1,I1,I2) with I1 and I2 being a iterator_from_2d
Definition: algorithm.hpp:934
A model of a heterogeneous pixel that is not byte aligned. Examples are bitmap (1-bit pixels) or 6-bi...