Imported Upstream version 1.49.0upstream/1.49.0

1 files changed, 136 insertions, 0 deletions

diff --git a/boost/gil/virtual_locator.hpp b/boost/gil/virtual_locator.hpp
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+/*
+    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
+
+////////////////////////////////////////////////////////////////////////////////////////
+/// \file               
+/// \brief Locator for virtual image views
+/// \author Lubomir Bourdev and Hailin Jin \n
+///         Adobe Systems Incorporated
+/// \date   2005-2007 \n Last updated on February 12, 2007
+///
+////////////////////////////////////////////////////////////////////////////////////////
+
+#include <boost/iterator/iterator_facade.hpp>
+#include "position_iterator.hpp"
+
+namespace boost { namespace gil {
+
+/// \brief A 2D locator over a virtual image. Upon dereferencing, invokes a given function object passing it its coordinates. Models: PixelLocatorConcept, HasDynamicXStepTypeConcept, HasDynamicYStepTypeConcept, HasTransposedTypeConcept
+/// \ingroup PixelLocatorModel PixelBasedModel
+/// 
+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