virtual_locator.hpp Go to the documentation of this file. /* 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_VIRTUAL_LOCATOR_HPP #define GIL_VIRTUAL_LOCATOR_HPP #include <boost/iterator/iterator_facade.hpp> #include "position_iterator.hpp" namespace boost { namespace gil { template <typename Deref, bool IsTransposed> // A function object that given a point returns a reference. Models PixelDereferenceAdaptorConcept class virtual_2d_locator : public pixel_2d_locator_base<virtual_2d_locator<Deref,IsTransposed>, position_iterator<Deref,IsTransposed>, position_iterator<Deref,1-IsTransposed> > { typedef virtual_2d_locator<Deref,IsTransposed> this_t; public: typedef pixel_2d_locator_base<virtual_2d_locator<Deref,IsTransposed>, position_iterator<Deref,IsTransposed>, position_iterator<Deref,1-IsTransposed> > parent_t; typedef virtual_2d_locator<typename Deref::const_t,IsTransposed> const_t; typedef Deref deref_fn_t; typedef typename parent_t::point_t point_t; typedef typename parent_t::coord_t coord_t; typedef typename parent_t::x_coord_t x_coord_t; typedef typename parent_t::y_coord_t y_coord_t; typedef typename parent_t::x_iterator x_iterator; typedef typename parent_t::y_iterator y_iterator; template <typename NewDeref> struct add_deref { typedef virtual_2d_locator<deref_compose<NewDeref,Deref>,IsTransposed > type; static type make(const virtual_2d_locator<Deref,IsTransposed>& loc, const NewDeref& nderef) { return type(loc.pos(), loc.step(), deref_compose<NewDeref,Deref>(nderef,loc.deref_fn())); } }; 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) {} template <typename D, bool TR> virtual_2d_locator(const virtual_2d_locator<D,TR>& loc, coord_t y_step) : _p(loc.pos(), point_t(loc.step().x,loc.step().y*y_step), loc.deref_fn()) {} template <typename D, bool TR> virtual_2d_locator(const virtual_2d_locator<D,TR>& loc, coord_t x_step, coord_t y_step, bool transpose=false) : _p(loc.pos(), transpose ? point_t(loc.step().x*y_step,loc.step().y*x_step) : point_t(loc.step().x*x_step,loc.step().y*y_step), loc.deref_fn()) { assert(transpose==(IsTransposed!=TR));} template <typename D, bool TR> virtual_2d_locator(const virtual_2d_locator<D,TR>& pl) : _p(pl._p) {} virtual_2d_locator(const virtual_2d_locator& pl) : _p(pl._p) {} bool operator==(const this_t& p) const { return _p==p._p; } x_iterator& x() { return *gil_reinterpret_cast<x_iterator*>(this); } y_iterator& y() { return _p; } x_iterator const& x() const { return *gil_reinterpret_cast_c<x_iterator const*>(this); } y_iterator const& y() const { return _p; } // Returns the y distance between two x_iterators given the difference of their x positions y_coord_t y_distance_to(const this_t& it2, x_coord_t xDiff) const { return (it2.pos()[1-IsTransposed] - pos()[1-IsTransposed])/step()[1-IsTransposed]; } 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? // Methods specific for virtual 2D locator const point_t& pos() const { return _p.pos(); } const point_t& step() const { return _p.step(); } const deref_fn_t& deref_fn() const { return _p.deref_fn(); } private: template <typename D, bool TR> friend class virtual_2d_locator; y_iterator _p; // contains the current position, the step and the dereference object }; // PixelBasedConcept template <typename D, bool TR> struct channel_type<virtual_2d_locator<D,TR> > : public channel_type<typename virtual_2d_locator<D,TR>::parent_t> { }; template <typename D, bool TR> struct color_space_type<virtual_2d_locator<D,TR> > : public color_space_type<typename virtual_2d_locator<D,TR>::parent_t> { }; template <typename D, bool TR> struct channel_mapping_type<virtual_2d_locator<D,TR> > : public channel_mapping_type<typename virtual_2d_locator<D,TR>::parent_t> { }; template <typename D, bool TR> struct is_planar<virtual_2d_locator<D,TR> > : public is_planar<typename virtual_2d_locator<D,TR>::parent_t> { }; // HasDynamicXStepTypeConcept template <typename D, bool TR> struct dynamic_x_step_type<virtual_2d_locator<D,TR> > { typedef virtual_2d_locator<D,TR> type; }; // HasDynamicYStepTypeConcept template <typename D, bool TR> struct dynamic_y_step_type<virtual_2d_locator<D,TR> > { typedef virtual_2d_locator<D,TR> type; }; // HasTransposedTypeConcept template <typename D, bool IsTransposed> struct transposed_type<virtual_2d_locator<D,IsTransposed> > { typedef virtual_2d_locator<D,1-IsTransposed> type; }; } } // namespace boost::gil #endif

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