138 lines
5.7 KiB
C++
138 lines
5.7 KiB
C++
//
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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_VIRTUAL_LOCATOR_HPP
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#define BOOST_GIL_VIRTUAL_LOCATOR_HPP
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#include <boost/gil/dynamic_step.hpp>
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#include <boost/gil/position_iterator.hpp>
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#include <boost/assert.hpp>
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#include <boost/iterator/iterator_facade.hpp>
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namespace boost { namespace gil {
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/// \brief A 2D locator over a virtual image. Upon dereferencing, invokes a given function object passing it its coordinates. Models: PixelLocatorConcept, HasDynamicXStepTypeConcept, HasDynamicYStepTypeConcept, HasTransposedTypeConcept
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/// \ingroup PixelLocatorModel PixelBasedModel
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///
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template <typename Deref, bool IsTransposed> // A function object that given a point returns a reference. Models PixelDereferenceAdaptorConcept
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class virtual_2d_locator : public pixel_2d_locator_base<virtual_2d_locator<Deref,IsTransposed>, position_iterator<Deref,IsTransposed>, position_iterator<Deref,1-IsTransposed>>
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{
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using this_t = virtual_2d_locator<Deref,IsTransposed>;
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public:
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using parent_t = pixel_2d_locator_base<virtual_2d_locator<Deref,IsTransposed>, position_iterator<Deref,IsTransposed>, position_iterator<Deref,1-IsTransposed>>;
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using const_t = virtual_2d_locator<typename Deref::const_t,IsTransposed>;
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using deref_fn_t = Deref;
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using point_t = typename parent_t::point_t;
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using coord_t = typename parent_t::coord_t;
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using x_coord_t = typename parent_t::x_coord_t;
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using y_coord_t = typename parent_t::y_coord_t;
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using x_iterator = typename parent_t::x_iterator;
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using y_iterator = typename parent_t::y_iterator;
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template <typename NewDeref> struct add_deref
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{
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using type = virtual_2d_locator<deref_compose<NewDeref,Deref>,IsTransposed>;
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static type make(const virtual_2d_locator<Deref,IsTransposed>& loc, const NewDeref& nderef) {
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return type(loc.pos(), loc.step(), deref_compose<NewDeref,Deref>(nderef,loc.deref_fn()));
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}
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};
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virtual_2d_locator(const point_t& p=point_t(0,0), const point_t& step=point_t(1,1), const deref_fn_t& d=deref_fn_t()) : _p(p,step,d) {}
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template <typename D, bool TR> virtual_2d_locator(const virtual_2d_locator<D,TR>& loc, coord_t y_step)
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: _p(loc.pos(), point_t(loc.step().x,loc.step().y*y_step), loc.deref_fn()) {}
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template <typename D, bool TR>
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virtual_2d_locator(virtual_2d_locator<D, TR> const& loc, coord_t x_step, coord_t y_step, bool transpose = false)
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: _p(loc.pos()
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, transpose ?
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point_t(loc.step().x * y_step, loc.step().y * x_step) :
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point_t(loc.step().x * x_step, loc.step().y * y_step)
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, loc.deref_fn())
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{
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BOOST_ASSERT(transpose == (IsTransposed != TR));
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}
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template <typename D, bool TR> virtual_2d_locator(const virtual_2d_locator<D,TR>& pl) : _p(pl._p) {}
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virtual_2d_locator(const virtual_2d_locator& pl) : _p(pl._p) {}
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bool operator==(const this_t& p) const { return _p==p._p; }
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x_iterator& x() { return *gil_reinterpret_cast<x_iterator*>(this); }
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y_iterator& y() { return _p; }
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x_iterator const& x() const { return *gil_reinterpret_cast_c<x_iterator const*>(this); }
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y_iterator const& y() const { return _p; }
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// Returns the y distance between two x_iterators given the difference of their x positions
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y_coord_t y_distance_to(const this_t& it2, x_coord_t) const { return (it2.pos()[1-IsTransposed] - pos()[1-IsTransposed])/step()[1-IsTransposed]; }
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bool is_1d_traversable(x_coord_t) const { return false; } // is there no gap at the end of each row? I.e. can we use x_iterator to visit every pixel instead of nested loops?
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// Methods specific for virtual 2D locator
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const point_t& pos() const { return _p.pos(); }
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const point_t& step() const { return _p.step(); }
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const deref_fn_t& deref_fn() const { return _p.deref_fn(); }
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private:
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template <typename D, bool TR> friend class virtual_2d_locator;
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y_iterator _p; // contains the current position, the step and the dereference object
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};
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/////////////////////////////
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// PixelBasedConcept
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/////////////////////////////
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template <typename D, bool TR>
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struct channel_type<virtual_2d_locator<D,TR> > : public channel_type<typename virtual_2d_locator<D,TR>::parent_t> {
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};
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template <typename D, bool TR>
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struct color_space_type<virtual_2d_locator<D,TR> > : public color_space_type<typename virtual_2d_locator<D,TR>::parent_t> {
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};
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template <typename D, bool TR>
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struct channel_mapping_type<virtual_2d_locator<D,TR> > : public channel_mapping_type<typename virtual_2d_locator<D,TR>::parent_t> {
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};
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template <typename D, bool TR>
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struct is_planar<virtual_2d_locator<D,TR> > : public is_planar<typename virtual_2d_locator<D,TR>::parent_t> {
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};
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/////////////////////////////
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// HasDynamicXStepTypeConcept
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/////////////////////////////
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template <typename D, bool TR>
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struct dynamic_x_step_type<virtual_2d_locator<D,TR>>
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{
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using type = virtual_2d_locator<D,TR>;
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};
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/////////////////////////////
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// HasDynamicYStepTypeConcept
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/////////////////////////////
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template <typename D, bool TR>
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struct dynamic_y_step_type<virtual_2d_locator<D,TR>>
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{
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using type = virtual_2d_locator<D,TR>;
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};
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/////////////////////////////
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// HasTransposedTypeConcept
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/////////////////////////////
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template <typename D, bool IsTransposed>
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struct transposed_type<virtual_2d_locator<D,IsTransposed>>
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{
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using type = virtual_2d_locator<D,1-IsTransposed>;
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};
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}} // namespace boost::gil
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#endif
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