Added thirdparty: boost library

thirdparty/include/boost/gil/pixel_iterator.hpp

@@ -0,0 +1,159 @@
+//
+// Copyright 2005-2007 Adobe Systems Incorporated
+//
+// Distributed under 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
+//
+#ifndef BOOST_GIL_PIXEL_ITERATOR_HPP
+#define BOOST_GIL_PIXEL_ITERATOR_HPP
+
+#include <boost/gil/concepts.hpp>
+#include <boost/gil/dynamic_step.hpp>
+#include <boost/gil/utilities.hpp>
+#include <boost/gil/pixel.hpp>
+
+#include <iterator>
+#include <type_traits>
+
+namespace boost { namespace gil {
+
+//forwarded declaration (as this file is included in step_iterator.hpp)
+template <typename Iterator>
+class memory_based_step_iterator;
+
+/// \brief metafunction predicate determining whether the given iterator is a plain one or an adaptor over another iterator.
+/// Examples of adaptors are the step iterator and the dereference iterator adaptor.
+template <typename It>
+struct is_iterator_adaptor : public std::false_type {};
+
+/// \brief returns the base iterator for a given iterator adaptor. Provide an specialization when introducing new iterator adaptors
+template <typename It>
+struct iterator_adaptor_get_base;
+
+/// \brief Changes the base iterator of an iterator adaptor. Provide an specialization when introducing new iterator adaptors
+template <typename It, typename NewBaseIt>
+struct iterator_adaptor_rebind;
+
+/// \brief Returns the type of an iterator just like the input iterator, except operating over immutable values
+template <typename It>
+struct const_iterator_type;
+
+// The default implementation when the iterator is a C pointer is to use the standard constness semantics
+template <typename T> struct const_iterator_type<T*>       { using type = T const*; };
+template <typename T> struct const_iterator_type<T const*> { using type = T const*; };
+
+/// \brief Metafunction predicate returning whether the given iterator allows for changing its values
+/// \ingroup GILIsMutable
+template <typename It>
+struct iterator_is_mutable{};
+
+// The default implementation when the iterator is a C pointer is to use the standard constness semantics
+template <typename T>
+struct iterator_is_mutable<T*> : std::true_type {};
+
+template <typename T>
+struct iterator_is_mutable<T const*> : std::false_type {};
+
+/// \defgroup PixelIteratorModelInterleavedPtr C pointer to a pixel
+/// \ingroup PixelIteratorModel
+/// \brief Iterators over interleaved pixels.
+/// A C pointer to a model of PixelValueConcept is used as an iterator over interleaved pixels. Models PixelIteratorConcept, HomogeneousPixelBasedConcept, HasDynamicXStepTypeConcept, MemoryBasedIteratorConcept
+
+
+
+/////////////////////////////
+//  HasDynamicXStepTypeConcept
+/////////////////////////////
+
+/// \ingroup PixelIteratorModelInterleavedPtr
+template <typename Pixel>
+struct dynamic_x_step_type<Pixel*> {
+    using type = memory_based_step_iterator<Pixel *>;
+};
+
+/// \ingroup PixelIteratorModelInterleavedPtr
+template <typename Pixel>
+struct dynamic_x_step_type<const Pixel*> {
+    using type = memory_based_step_iterator<const Pixel *>;
+};
+
+
+/////////////////////////////
+//  PixelBasedConcept
+/////////////////////////////
+
+template <typename Pixel>
+struct color_space_type<Pixel*> : color_space_type<Pixel> {};
+
+template <typename Pixel>
+struct color_space_type<Pixel const*> : color_space_type<Pixel> {};
+
+template <typename Pixel>
+struct channel_mapping_type<Pixel*> : channel_mapping_type<Pixel> {};
+
+template <typename Pixel>
+struct channel_mapping_type<Pixel const*> : channel_mapping_type<Pixel> {};
+
+template <typename Pixel>
+struct is_planar<Pixel*> : is_planar<Pixel> {};
+
+template <typename Pixel>
+struct is_planar<Pixel const*> : is_planar<Pixel> {};
+
+/////////////////////////////
+//  HomogeneousPixelBasedConcept
+/////////////////////////////
+
+template <typename Pixel>
+struct channel_type<Pixel*> : channel_type<Pixel> {};
+
+template <typename Pixel>
+struct channel_type<Pixel const*> : channel_type<Pixel> {};
+
+////////////////////////////////////////////////////////////////////////////////////////
+/// Support for pixel iterator movement measured in memory units (bytes or bits) as opposed to pixel type.
+/// Necessary to handle image row alignment and channel plane alignment.
+////////////////////////////////////////////////////////////////////////////////////////
+
+/////////////////////////////
+//  MemoryBasedIteratorConcept
+/////////////////////////////
+
+template <typename T>
+struct byte_to_memunit : std::integral_constant<int, 1> {};
+
+template <typename P>
+inline std::ptrdiff_t memunit_step(P const*) { return sizeof(P); }
+
+template <typename P>
+inline std::ptrdiff_t memunit_distance(P const* p1, P const* p2)
+{
+    return (
+        gil_reinterpret_cast_c<unsigned char const*>(p2) -
+        gil_reinterpret_cast_c<unsigned char const*>(p1));
+}
+
+template <typename P>
+inline void memunit_advance(P* &p, std::ptrdiff_t diff)
+{
+    p = (P*)((unsigned char*)(p)+diff);
+}
+
+template <typename P>
+inline P* memunit_advanced(const P* p, std::ptrdiff_t diff)
+{
+    return (P*)((char*)(p)+diff);
+}
+
+//  memunit_advanced_ref
+//  (shortcut to advancing a pointer by a given number of memunits and taking the reference in case the compiler is not smart enough)
+
+template <typename P>
+inline P& memunit_advanced_ref(P* p, std::ptrdiff_t diff) {
+    return *memunit_advanced(p,diff);
+}
+
+} }  // namespace boost::gil
+
+#endif