pixel_iterator.hpp

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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_PIXEL_ITERATOR_H
00014 #define GIL_PIXEL_ITERATOR_H
00015 
00024 
00025 #include <cassert>
00026 #include <iterator>
00027 #include "gil_config.hpp"
00028 #include "gil_concept.hpp"
00029 #include "utilities.hpp"
00030 #include "pixel.hpp"
00031 
00032 namespace boost { namespace gil {
00033 
00034 //forwarded declaration (as this file is included in step_iterator.hpp)
00035 template <typename Iterator>
00036 class memory_based_step_iterator;
00037 
00038 template <typename Iterator> struct dynamic_x_step_type;
00039 
00042 template <typename It>
00043 struct is_iterator_adaptor : public mpl::false_{};
00044 
00046 template <typename It>
00047 struct iterator_adaptor_get_base;
00048 
00050 template <typename It, typename NewBaseIt>
00051 struct iterator_adaptor_rebind;
00052 
00054 template <typename It>
00055 struct const_iterator_type;
00056 
00057 // The default implementation when the iterator is a C pointer is to use the standard constness semantics
00058 template <typename T> struct const_iterator_type<      T*> { typedef const T* type; };
00059 template <typename T> struct const_iterator_type<const T*> { typedef const T* type; };
00060 
00063 template <typename It>
00064 struct iterator_is_mutable{};
00065 
00066 // The default implementation when the iterator is a C pointer is to use the standard constness semantics
00067 template <typename T> struct iterator_is_mutable<      T*> : public mpl::true_{};
00068 template <typename T> struct iterator_is_mutable<const T*> : public mpl::false_{};
00069 
00074 
00075 
00076 
00078 //  HasDynamicXStepTypeConcept
00080 
00082 template <typename Pixel>
00083 struct dynamic_x_step_type<Pixel*> {
00084     typedef memory_based_step_iterator<Pixel*> type;
00085 };
00086 
00088 template <typename Pixel>
00089 struct dynamic_x_step_type<const Pixel*> {
00090     typedef memory_based_step_iterator<const Pixel*> type;
00091 };
00092 
00093 
00095 //  PixelBasedConcept
00097 
00098 template <typename Pixel> struct color_space_type<      Pixel*> : public color_space_type<Pixel> {};
00099 template <typename Pixel> struct color_space_type<const Pixel*> : public color_space_type<Pixel> {};
00100 
00101 template <typename Pixel> struct channel_mapping_type<      Pixel*> : public channel_mapping_type<Pixel> {};
00102 template <typename Pixel> struct channel_mapping_type<const Pixel*> : public channel_mapping_type<Pixel> {};
00103 
00104 template <typename Pixel> struct is_planar<      Pixel*> : public is_planar<Pixel> {};
00105 template <typename Pixel> struct is_planar<const Pixel*> : public is_planar<Pixel> {};
00106 
00108 //  HomogeneousPixelBasedConcept
00110 
00111 template <typename Pixel> struct channel_type<Pixel*> : public channel_type<Pixel> {};
00112 template <typename Pixel> struct channel_type<const Pixel*> : public channel_type<Pixel> {};
00113 
00120 
00122 //  MemoryBasedIteratorConcept
00124 
00125 template <typename T>
00126 struct byte_to_memunit : public mpl::int_<1> {};
00127 
00128 template <typename P>
00129 inline std::ptrdiff_t memunit_step(const P*) { return sizeof(P); }
00130 
00131 template <typename P>
00132 inline std::ptrdiff_t memunit_distance(const P* p1, const P* p2) { 
00133     return (gil_reinterpret_cast_c<const unsigned char*>(p2)-gil_reinterpret_cast_c<const unsigned char*>(p1)); 
00134 }
00135 
00136 template <typename P>
00137 inline void memunit_advance(P* &p, std::ptrdiff_t diff) { 
00138     p=(P*)((unsigned char*)(p)+diff);
00139 }
00140 
00141 template <typename P>
00142 inline P* memunit_advanced(const P* p, std::ptrdiff_t diff) {
00143     return (P*)((char*)(p)+diff);
00144 }
00145 
00146 //  memunit_advanced_ref
00147 //  (shortcut to advancing a pointer by a given number of memunits and taking the reference in case the compiler is not smart enough)
00148 
00149 template <typename P>
00150 inline P& memunit_advanced_ref(P* p, std::ptrdiff_t diff) {
00151     return *memunit_advanced(p,diff);
00152 }
00153 
00154 } }  // namespace boost::gil
00155 
00156 #endif

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