192 lines
9.5 KiB
C++
192 lines
9.5 KiB
C++
/*
|
|
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
|
|
|
|
////////////////////////////////////////////////////////////////////////////////////////
|
|
/// \file
|
|
/// \brief A model of a heterogeneous pixel that is not byte aligned. Examples are bitmap (1-bit pixels) or 6-bit RGB (222)
|
|
/// \author Lubomir Bourdev and Hailin Jin \n
|
|
/// Adobe Systems Incorporated
|
|
/// \date 2005-2007 \n Last updated on September 28, 2006
|
|
///
|
|
////////////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#include <functional>
|
|
#include <boost/iterator/iterator_facade.hpp>
|
|
#include "gil_config.hpp"
|
|
#include "bit_aligned_pixel_reference.hpp"
|
|
#include "pixel_iterator.hpp"
|
|
|
|
namespace boost { namespace gil {
|
|
|
|
/// \defgroup PixelIteratorNonAlignedPixelIterator bit_aligned_pixel_iterator
|
|
/// \ingroup PixelIteratorModel
|
|
/// \brief An iterator over non-byte-aligned pixels. Models PixelIteratorConcept, PixelBasedConcept, MemoryBasedIteratorConcept, HasDynamicXStepTypeConcept
|
|
|
|
////////////////////////////////////////////////////////////////////////////////////////
|
|
/// \brief An iterator over non-byte-aligned pixels. Models PixelIteratorConcept, PixelBasedConcept, MemoryBasedIteratorConcept, HasDynamicXStepTypeConcept
|
|
///
|
|
/// An iterator over pixels that correspond to non-byte-aligned bit ranges. Examples of such pixels are single bit grayscale pixel, or a 6-bit RGB 222 pixel.
|
|
///
|
|
/// \ingroup PixelIteratorNonAlignedPixelIterator PixelBasedModel
|
|
|
|
template <typename NonAlignedPixelReference>
|
|
struct bit_aligned_pixel_iterator : public iterator_facade<bit_aligned_pixel_iterator<NonAlignedPixelReference>,
|
|
typename NonAlignedPixelReference::value_type,
|
|
std::random_access_iterator_tag,
|
|
const NonAlignedPixelReference,
|
|
typename NonAlignedPixelReference::bit_range_t::difference_type> {
|
|
private:
|
|
typedef iterator_facade<bit_aligned_pixel_iterator<NonAlignedPixelReference>,
|
|
typename NonAlignedPixelReference::value_type,
|
|
std::random_access_iterator_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) {}
|
|
|
|
/// For some reason operator[] provided by iterator_adaptor returns a custom class that is convertible to reference
|
|
/// We require our own reference because it is registered in iterator_traits
|
|
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 B, typename C, typename L, bool M>
|
|
struct iterator_type_from_pixel<const bit_aligned_pixel_reference<B,C,L,M>,false,false,false> {
|
|
typedef bit_aligned_pixel_iterator<bit_aligned_pixel_reference<B,C,L,false> > type;
|
|
};
|
|
|
|
template <typename B, typename C, typename L, bool M>
|
|
struct iterator_type_from_pixel<const bit_aligned_pixel_reference<B,C,L,M>,false,false,true> {
|
|
typedef bit_aligned_pixel_iterator<bit_aligned_pixel_reference<B,C,L,true> > type;
|
|
};
|
|
|
|
template <typename B, typename C, typename L, bool M, bool IsPlanar, bool IsStep, bool IsMutable>
|
|
struct iterator_type_from_pixel<bit_aligned_pixel_reference<B,C,L,M>,IsPlanar,IsStep,IsMutable>
|
|
: public iterator_type_from_pixel<const bit_aligned_pixel_reference<B,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
|