558 lines
19 KiB
C++
558 lines
19 KiB
C++
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//
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// Copyright 2005-2007 Adobe Systems Incorporated
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//
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// Distributed under the Boost Software License, Version 1.0
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// See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt
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//
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#ifndef BOOST_GIL_CONCEPTS_IMAGE_VIEW_HPP
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#define BOOST_GIL_CONCEPTS_IMAGE_VIEW_HPP
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#include <boost/gil/concepts/basic.hpp>
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#include <boost/gil/concepts/concept_check.hpp>
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#include <boost/gil/concepts/fwd.hpp>
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#include <boost/gil/concepts/pixel.hpp>
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#include <boost/gil/concepts/pixel_dereference.hpp>
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#include <boost/gil/concepts/pixel_iterator.hpp>
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#include <boost/gil/concepts/pixel_locator.hpp>
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#include <boost/gil/concepts/point.hpp>
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#include <boost/gil/concepts/detail/utility.hpp>
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#include <cstddef>
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#include <iterator>
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#include <type_traits>
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#if defined(BOOST_CLANG)
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wunknown-pragmas"
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#pragma clang diagnostic ignored "-Wunused-local-typedefs"
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#endif
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#if defined(BOOST_GCC) && (BOOST_GCC >= 40900)
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wunused-local-typedefs"
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#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
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#endif
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namespace boost { namespace gil {
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/// \defgroup ImageViewNDConcept ImageViewNDLocatorConcept
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/// \ingroup ImageViewConcept
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/// \brief N-dimensional range
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/// \defgroup ImageView2DConcept ImageView2DLocatorConcept
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/// \ingroup ImageViewConcept
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/// \brief 2-dimensional range
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/// \defgroup PixelImageViewConcept ImageViewConcept
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/// \ingroup ImageViewConcept
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/// \brief 2-dimensional range over pixel data
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/// \ingroup ImageViewNDConcept
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/// \brief N-dimensional view over immutable values
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///
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/// \code
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/// concept RandomAccessNDImageViewConcept<Regular View>
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/// {
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/// typename value_type;
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/// typename reference; // result of dereferencing
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/// typename difference_type; // result of operator-(iterator,iterator) (1-dimensional!)
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/// typename const_t; where RandomAccessNDImageViewConcept<View>; // same as View, but over immutable values
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/// typename point_t; where PointNDConcept<point_t>; // N-dimensional point
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/// typename locator; where RandomAccessNDLocatorConcept<locator>; // N-dimensional locator.
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/// typename iterator; where RandomAccessTraversalConcept<iterator>; // 1-dimensional iterator over all values
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/// typename reverse_iterator; where RandomAccessTraversalConcept<reverse_iterator>;
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/// typename size_type; // the return value of size()
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///
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/// // Equivalent to RandomAccessNDLocatorConcept::axis
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/// template <size_t D> struct axis {
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/// typename coord_t = point_t::axis<D>::coord_t;
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/// typename iterator; where RandomAccessTraversalConcept<iterator>; // iterator along D-th axis.
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/// where SameType<coord_t, iterator::difference_type>;
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/// where SameType<iterator::value_type,value_type>;
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/// };
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///
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/// // Defines the type of a view similar to this type, except it invokes Deref upon dereferencing
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/// template <PixelDereferenceAdaptorConcept Deref> struct add_deref {
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/// typename type; where RandomAccessNDImageViewConcept<type>;
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/// static type make(const View& v, const Deref& deref);
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/// };
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///
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/// static const size_t num_dimensions = point_t::num_dimensions;
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///
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/// // Create from a locator at the top-left corner and dimensions
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/// View::View(const locator&, const point_type&);
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///
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/// size_type View::size() const; // total number of elements
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/// reference operator[](View, const difference_type&) const; // 1-dimensional reference
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/// iterator View::begin() const;
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/// iterator View::end() const;
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/// reverse_iterator View::rbegin() const;
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/// reverse_iterator View::rend() const;
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/// iterator View::at(point_t const&);
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/// point_t View::dimensions() const; // number of elements along each dimension
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/// bool View::is_1d_traversable() const; // can an iterator over the first dimension visit each value? I.e. are there gaps between values?
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///
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/// // iterator along a given dimension starting at a given point
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/// template <size_t D> View::axis<D>::iterator View::axis_iterator(point_t const&) const;
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///
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/// reference operator()(View,point_t const&) const;
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/// };
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/// \endcode
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template <typename View>
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struct RandomAccessNDImageViewConcept
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{
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void constraints()
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{
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gil_function_requires<Regular<View>>();
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using value_type = typename View::value_type;
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using reference = typename View::reference; // result of dereferencing
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using pointer = typename View::pointer;
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using difference_type = typename View::difference_type; // result of operator-(1d_iterator,1d_iterator)
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using const_t = typename View::const_t; // same as this type, but over const values
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using point_t = typename View::point_t; // N-dimensional point
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using locator = typename View::locator; // N-dimensional locator
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using iterator = typename View::iterator;
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using const_iterator = typename View::const_iterator;
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using reverse_iterator = typename View::reverse_iterator;
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using size_type = typename View::size_type;
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static const std::size_t N=View::num_dimensions;
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gil_function_requires<RandomAccessNDLocatorConcept<locator>>();
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gil_function_requires<boost_concepts::RandomAccessTraversalConcept<iterator>>();
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gil_function_requires<boost_concepts::RandomAccessTraversalConcept<reverse_iterator>>();
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using first_it_type = typename View::template axis<0>::iterator;
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using last_it_type = typename View::template axis<N-1>::iterator;
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gil_function_requires<boost_concepts::RandomAccessTraversalConcept<first_it_type>>();
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gil_function_requires<boost_concepts::RandomAccessTraversalConcept<last_it_type>>();
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// static_assert(typename std::iterator_traits<first_it_type>::difference_type, typename point_t::template axis<0>::coord_t>::value, "");
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// static_assert(typename std::iterator_traits<last_it_type>::difference_type, typename point_t::template axis<N-1>::coord_t>::value, "");
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// point_t must be an N-dimensional point, each dimension of which must have the same type as difference_type of the corresponding iterator
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gil_function_requires<PointNDConcept<point_t>>();
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static_assert(point_t::num_dimensions == N, "");
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static_assert(std::is_same
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<
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typename std::iterator_traits<first_it_type>::difference_type,
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typename point_t::template axis<0>::coord_t
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>::value, "");
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static_assert(std::is_same
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<
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typename std::iterator_traits<last_it_type>::difference_type,
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typename point_t::template axis<N-1>::coord_t
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>::value, "");
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point_t p;
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locator lc;
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iterator it;
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reverse_iterator rit;
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difference_type d; detail::initialize_it(d); ignore_unused_variable_warning(d);
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View(p,lc); // view must be constructible from a locator and a point
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p = view.dimensions();
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lc = view.pixels();
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size_type sz = view.size(); ignore_unused_variable_warning(sz);
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bool is_contiguous = view.is_1d_traversable();
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ignore_unused_variable_warning(is_contiguous);
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it = view.begin();
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it = view.end();
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rit = view.rbegin();
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rit = view.rend();
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reference r1 = view[d]; ignore_unused_variable_warning(r1); // 1D access
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reference r2 = view(p); ignore_unused_variable_warning(r2); // 2D access
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// get 1-D iterator of any dimension at a given pixel location
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first_it_type fi = view.template axis_iterator<0>(p);
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ignore_unused_variable_warning(fi);
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last_it_type li = view.template axis_iterator<N-1>(p);
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ignore_unused_variable_warning(li);
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using deref_t = PixelDereferenceAdaptorArchetype<typename View::value_type>;
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using dtype = typename View::template add_deref<deref_t>::type;
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}
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View view;
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};
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/// \ingroup ImageView2DConcept
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/// \brief 2-dimensional view over immutable values
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///
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/// \code
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/// concept RandomAccess2DImageViewConcept<RandomAccessNDImageViewConcept View> {
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/// where num_dimensions==2;
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///
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/// typename x_iterator = axis<0>::iterator;
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/// typename y_iterator = axis<1>::iterator;
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/// typename x_coord_t = axis<0>::coord_t;
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/// typename y_coord_t = axis<1>::coord_t;
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/// typename xy_locator = locator;
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///
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/// x_coord_t View::width() const;
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/// y_coord_t View::height() const;
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///
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/// // X-navigation
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/// x_iterator View::x_at(point_t const&) const;
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/// x_iterator View::row_begin(y_coord_t) const;
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/// x_iterator View::row_end (y_coord_t) const;
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///
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/// // Y-navigation
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/// y_iterator View::y_at(point_t const&) const;
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/// y_iterator View::col_begin(x_coord_t) const;
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/// y_iterator View::col_end (x_coord_t) const;
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///
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/// // navigating in 2D
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/// xy_locator View::xy_at(point_t const&) const;
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///
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/// // (x,y) versions of all methods taking point_t
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/// View::View(x_coord_t,y_coord_t,const locator&);
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/// iterator View::at(x_coord_t,y_coord_t) const;
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/// reference operator()(View,x_coord_t,y_coord_t) const;
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/// xy_locator View::xy_at(x_coord_t,y_coord_t) const;
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/// x_iterator View::x_at(x_coord_t,y_coord_t) const;
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/// y_iterator View::y_at(x_coord_t,y_coord_t) const;
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/// };
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/// \endcode
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template <typename View>
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struct RandomAccess2DImageViewConcept
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{
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void constraints()
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{
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gil_function_requires<RandomAccessNDImageViewConcept<View>>();
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static_assert(View::num_dimensions == 2, "");
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// TODO: This executes the requirements for RandomAccessNDLocatorConcept again. Fix it to improve compile time
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gil_function_requires<RandomAccess2DLocatorConcept<typename View::locator>>();
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using dynamic_x_step_t = typename dynamic_x_step_type<View>::type;
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using dynamic_y_step_t = typename dynamic_y_step_type<View>::type;
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using transposed_t = typename transposed_type<View>::type;
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using x_iterator = typename View::x_iterator;
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using y_iterator = typename View::y_iterator;
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using x_coord_t = typename View::x_coord_t;
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using y_coord_t = typename View::y_coord_t;
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using xy_locator = typename View::xy_locator;
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x_coord_t xd = 0; ignore_unused_variable_warning(xd);
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y_coord_t yd = 0; ignore_unused_variable_warning(yd);
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x_iterator xit;
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y_iterator yit;
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typename View::point_t d;
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View(xd, yd, xy_locator()); // constructible with width, height, 2d_locator
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xy_locator lc = view.xy_at(xd, yd);
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lc = view.xy_at(d);
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typename View::reference r = view(xd, yd);
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ignore_unused_variable_warning(r);
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xd = view.width();
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yd = view.height();
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xit = view.x_at(d);
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xit = view.x_at(xd,yd);
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xit = view.row_begin(xd);
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xit = view.row_end(xd);
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yit = view.y_at(d);
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yit = view.y_at(xd,yd);
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yit = view.col_begin(xd);
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yit = view.col_end(xd);
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}
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View view;
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};
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/// \brief GIL view as Collection.
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///
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/// \see https://www.boost.org/libs/utility/Collection.html
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///
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template <typename View>
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struct CollectionImageViewConcept
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{
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void constraints()
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{
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using value_type = typename View::value_type;
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using iterator = typename View::iterator;
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using const_iterator = typename View::const_iterator;
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using reference = typename View::reference;
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using const_reference = typename View::const_reference;
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using pointer = typename View::pointer;
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using difference_type = typename View::difference_type;
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using size_type= typename View::size_type;
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iterator i;
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i = view1.begin();
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i = view2.end();
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const_iterator ci;
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ci = view1.begin();
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ci = view2.end();
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size_type s;
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s = view1.size();
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s = view2.size();
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ignore_unused_variable_warning(s);
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view1.empty();
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view1.swap(view2);
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}
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View view1;
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View view2;
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};
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/// \brief GIL view as ForwardCollection.
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///
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/// \see https://www.boost.org/libs/utility/Collection.html
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///
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template <typename View>
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struct ForwardCollectionImageViewConcept
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{
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void constraints()
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{
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gil_function_requires<CollectionImageViewConcept<View>>();
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using reference = typename View::reference;
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using const_reference = typename View::const_reference;
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reference r = view.front();
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ignore_unused_variable_warning(r);
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const_reference cr = view.front();
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ignore_unused_variable_warning(cr);
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}
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View view;
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};
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/// \brief GIL view as ReversibleCollection.
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///
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/// \see https://www.boost.org/libs/utility/Collection.html
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///
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template <typename View>
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struct ReversibleCollectionImageViewConcept
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{
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void constraints()
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{
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gil_function_requires<CollectionImageViewConcept<View>>();
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using reverse_iterator = typename View::reverse_iterator;
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using reference = typename View::reference;
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using const_reference = typename View::const_reference;
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reverse_iterator i;
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i = view.rbegin();
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i = view.rend();
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reference r = view.back();
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ignore_unused_variable_warning(r);
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const_reference cr = view.back();
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ignore_unused_variable_warning(cr);
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}
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View view;
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};
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/// \ingroup PixelImageViewConcept
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/// \brief GIL's 2-dimensional view over immutable GIL pixels
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/// \code
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/// concept ImageViewConcept<RandomAccess2DImageViewConcept View>
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/// {
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/// where PixelValueConcept<value_type>;
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/// where PixelIteratorConcept<x_iterator>;
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/// where PixelIteratorConcept<y_iterator>;
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/// where x_coord_t == y_coord_t;
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///
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/// typename coord_t = x_coord_t;
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///
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/// std::size_t View::num_channels() const;
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/// };
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/// \endcode
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template <typename View>
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struct ImageViewConcept
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{
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void constraints()
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{
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gil_function_requires<RandomAccess2DImageViewConcept<View>>();
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// TODO: This executes the requirements for RandomAccess2DLocatorConcept again. Fix it to improve compile time
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gil_function_requires<PixelLocatorConcept<typename View::xy_locator>>();
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static_assert(std::is_same<typename View::x_coord_t, typename View::y_coord_t>::value, "");
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using coord_t = typename View::coord_t; // 1D difference type (same for all dimensions)
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std::size_t num_chan = view.num_channels(); ignore_unused_variable_warning(num_chan);
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}
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View view;
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};
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namespace detail {
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/// \tparam View Models RandomAccessNDImageViewConcept
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template <typename View>
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struct RandomAccessNDImageViewIsMutableConcept
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{
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void constraints()
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{
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gil_function_requires<detail::RandomAccessNDLocatorIsMutableConcept<typename View::locator>>();
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gil_function_requires<detail::RandomAccessIteratorIsMutableConcept<typename View::iterator>>();
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gil_function_requires<detail::RandomAccessIteratorIsMutableConcept
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<
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typename View::reverse_iterator
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>>();
|
||
|
|
||
|
gil_function_requires<detail::RandomAccessIteratorIsMutableConcept
|
||
|
<
|
||
|
typename View::template axis<0>::iterator
|
||
|
>>();
|
||
|
|
||
|
gil_function_requires<detail::RandomAccessIteratorIsMutableConcept
|
||
|
<
|
||
|
typename View::template axis<View::num_dimensions - 1>::iterator
|
||
|
>>();
|
||
|
|
||
|
typename View::difference_type diff;
|
||
|
initialize_it(diff);
|
||
|
ignore_unused_variable_warning(diff);
|
||
|
|
||
|
typename View::point_t pt;
|
||
|
typename View::value_type v;
|
||
|
initialize_it(v);
|
||
|
|
||
|
view[diff] = v;
|
||
|
view(pt) = v;
|
||
|
}
|
||
|
View view;
|
||
|
};
|
||
|
|
||
|
/// \tparam View Models RandomAccessNDImageViewConcept
|
||
|
template <typename View>
|
||
|
struct RandomAccess2DImageViewIsMutableConcept
|
||
|
{
|
||
|
void constraints()
|
||
|
{
|
||
|
gil_function_requires<detail::RandomAccessNDImageViewIsMutableConcept<View>>();
|
||
|
typename View::x_coord_t xd = 0; ignore_unused_variable_warning(xd);
|
||
|
typename View::y_coord_t yd = 0; ignore_unused_variable_warning(yd);
|
||
|
typename View::value_type v; initialize_it(v);
|
||
|
view(xd, yd) = v;
|
||
|
}
|
||
|
View view;
|
||
|
};
|
||
|
|
||
|
/// \tparam View Models ImageViewConcept
|
||
|
template <typename View>
|
||
|
struct PixelImageViewIsMutableConcept
|
||
|
{
|
||
|
void constraints()
|
||
|
{
|
||
|
gil_function_requires<detail::RandomAccess2DImageViewIsMutableConcept<View>>();
|
||
|
}
|
||
|
};
|
||
|
|
||
|
} // namespace detail
|
||
|
|
||
|
/// \ingroup ImageViewNDConcept
|
||
|
/// \brief N-dimensional view over mutable values
|
||
|
///
|
||
|
/// \code
|
||
|
/// concept MutableRandomAccessNDImageViewConcept<RandomAccessNDImageViewConcept View>
|
||
|
/// {
|
||
|
/// where Mutable<reference>;
|
||
|
/// };
|
||
|
/// \endcode
|
||
|
template <typename View>
|
||
|
struct MutableRandomAccessNDImageViewConcept
|
||
|
{
|
||
|
void constraints()
|
||
|
{
|
||
|
gil_function_requires<RandomAccessNDImageViewConcept<View>>();
|
||
|
gil_function_requires<detail::RandomAccessNDImageViewIsMutableConcept<View>>();
|
||
|
}
|
||
|
};
|
||
|
|
||
|
/// \ingroup ImageView2DConcept
|
||
|
/// \brief 2-dimensional view over mutable values
|
||
|
///
|
||
|
/// \code
|
||
|
/// concept MutableRandomAccess2DImageViewConcept<RandomAccess2DImageViewConcept View>
|
||
|
/// : MutableRandomAccessNDImageViewConcept<View> {};
|
||
|
/// \endcode
|
||
|
template <typename View>
|
||
|
struct MutableRandomAccess2DImageViewConcept
|
||
|
{
|
||
|
void constraints()
|
||
|
{
|
||
|
gil_function_requires<RandomAccess2DImageViewConcept<View>>();
|
||
|
gil_function_requires<detail::RandomAccess2DImageViewIsMutableConcept<View>>();
|
||
|
}
|
||
|
};
|
||
|
|
||
|
/// \ingroup PixelImageViewConcept
|
||
|
/// \brief GIL's 2-dimensional view over mutable GIL pixels
|
||
|
///
|
||
|
/// \code
|
||
|
/// concept MutableImageViewConcept<ImageViewConcept View>
|
||
|
/// : MutableRandomAccess2DImageViewConcept<View> {};
|
||
|
/// \endcode
|
||
|
template <typename View>
|
||
|
struct MutableImageViewConcept
|
||
|
{
|
||
|
void constraints()
|
||
|
{
|
||
|
gil_function_requires<ImageViewConcept<View>>();
|
||
|
gil_function_requires<detail::PixelImageViewIsMutableConcept<View>>();
|
||
|
}
|
||
|
};
|
||
|
|
||
|
/// \brief Returns whether two views are compatible
|
||
|
///
|
||
|
/// Views are compatible if their pixels are compatible.
|
||
|
/// Compatible views can be assigned and copy constructed from one another.
|
||
|
///
|
||
|
/// \tparam V1 Models ImageViewConcept
|
||
|
/// \tparam V2 Models ImageViewConcept
|
||
|
///
|
||
|
template <typename V1, typename V2>
|
||
|
struct views_are_compatible
|
||
|
: pixels_are_compatible<typename V1::value_type, typename V2::value_type>
|
||
|
{
|
||
|
};
|
||
|
|
||
|
/// \ingroup ImageViewConcept
|
||
|
/// \brief Views are compatible if they have the same color spaces and compatible channel values.
|
||
|
///
|
||
|
/// Constness and layout are not important for compatibility.
|
||
|
///
|
||
|
/// \code
|
||
|
/// concept ViewsCompatibleConcept<ImageViewConcept V1, ImageViewConcept V2>
|
||
|
/// {
|
||
|
/// where PixelsCompatibleConcept<V1::value_type, P2::value_type>;
|
||
|
/// };
|
||
|
/// \endcode
|
||
|
template <typename V1, typename V2>
|
||
|
struct ViewsCompatibleConcept
|
||
|
{
|
||
|
void constraints()
|
||
|
{
|
||
|
static_assert(views_are_compatible<V1, V2>::value, "");
|
||
|
}
|
||
|
};
|
||
|
|
||
|
}} // namespace boost::gil
|
||
|
|
||
|
#if defined(BOOST_CLANG)
|
||
|
#pragma clang diagnostic pop
|
||
|
#endif
|
||
|
|
||
|
#if defined(BOOST_GCC) && (BOOST_GCC >= 40900)
|
||
|
#pragma GCC diagnostic pop
|
||
|
#endif
|
||
|
|
||
|
#endif
|