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223 lines
10 KiB
223 lines
10 KiB
/* |
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Copyright 2005-2007 Adobe Systems Incorporated |
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Use, modification and distribution are subject to the Boost Software License, |
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Version 1.0. (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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See http://opensource.adobe.com/gil for most recent version including documentation. |
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*/ |
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/*************************************************************************************************/ |
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#ifndef GIL_IMAGE_VIEW_H |
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#define GIL_IMAGE_VIEW_H |
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//////////////////////////////////////////////////////////////////////////////////////// |
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/// \file |
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/// \brief image view class |
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/// \author Lubomir Bourdev and Hailin Jin \n |
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/// Adobe Systems Incorporated |
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/// \date 2005-2007 \n Last updated on February 12, 2007 |
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/// |
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//////////////////////////////////////////////////////////////////////////////////////// |
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#include <cstddef> |
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#include <iterator> |
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#include "gil_config.hpp" |
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#include "iterator_from_2d.hpp" |
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//#ifdef _MSC_VER |
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//#pragma warning(push) |
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//#pragma warning(disable : 4244) // conversion from 'gil::image<V,Alloc>::coord_t' to 'int', possible loss of data (visual studio compiler doesn't realize that the two types are the same) |
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//#endif |
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namespace boost { namespace gil { |
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//////////////////////////////////////////////////////////////////////////////////////// |
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/// \class image_view |
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/// \ingroup ImageViewModel PixelBasedModel |
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/// \brief A lightweight object that interprets memory as a 2D array of pixels. Models ImageViewConcept,PixelBasedConcept,HasDynamicXStepTypeConcept,HasDynamicYStepTypeConcept,HasTransposedTypeConcept |
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/// |
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/// Image view consists of a pixel 2D locator (defining the mechanism for navigating in 2D) |
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/// and the image dimensions. |
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/// |
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/// Image views to images are what ranges are to STL containers. They are lightweight objects, |
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/// that don't own the pixels. It is the user's responsibility that the underlying data remains |
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/// valid for the lifetime of the image view. |
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/// |
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/// Similar to iterators and ranges, constness of views does not extend to constness of pixels. |
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/// A const \p image_view does not allow changing its location in memory (resizing, moving) but does |
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/// not prevent one from changing the pixels. The latter requires an image view whose value_type |
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/// is const. |
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/// |
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/// Images have interfaces consistent with STL 1D random access containers, so they can be used |
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/// directly in STL algorithms like: |
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/// \code |
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/// std::fill(img.begin(), img.end(), red_pixel); |
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/// \endcode |
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/// |
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/// In addition, horizontal, vertical and 2D random access iterators are provided. |
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/// |
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/// Note also that \p image_view does not require that its element type be a pixel. It could be |
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/// instantiated with a locator whose \p value_type models only \p Regular. In this case the image |
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/// view models the weaker RandomAccess2DImageViewConcept, and does not model PixelBasedConcept. |
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/// Many generic algorithms don't require the elements to be pixels. |
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/// |
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//////////////////////////////////////////////////////////////////////////////////////// |
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template <typename Loc> // Models 2D Pixel Locator |
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class image_view { |
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public: |
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// typedefs required by ConstRandomAccessNDImageViewConcept |
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static const std::size_t num_dimensions=2; |
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typedef typename Loc::value_type value_type; |
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typedef typename Loc::reference reference; // result of dereferencing |
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typedef typename Loc::coord_t coord_t; // 1D difference type (same for all dimensions) |
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typedef coord_t difference_type; // result of operator-(1d_iterator,1d_iterator) |
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typedef typename Loc::point_t point_t; |
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typedef Loc locator; |
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typedef image_view<typename Loc::const_t> const_t; // same as this type, but over const values |
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template <std::size_t D> struct axis { |
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typedef typename Loc::template axis<D>::coord_t coord_t; // difference_type along each dimension |
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typedef typename Loc::template axis<D>::iterator iterator; // 1D iterator type along each dimension |
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}; |
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typedef iterator_from_2d<Loc> iterator; // 1D iterator type for each pixel left-to-right inside top-to-bottom |
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typedef std::reverse_iterator<iterator> reverse_iterator; |
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typedef std::size_t size_type; |
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// typedefs required by ConstRandomAccess2DImageViewConcept |
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typedef locator xy_locator; |
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typedef typename xy_locator::x_iterator x_iterator; // pixel iterator along a row |
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typedef typename xy_locator::y_iterator y_iterator; // pixel iterator along a column |
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typedef typename xy_locator::x_coord_t x_coord_t; |
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typedef typename xy_locator::y_coord_t y_coord_t; |
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template <typename Deref> struct add_deref { |
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typedef image_view<typename Loc::template add_deref<Deref>::type> type; |
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static type make(const image_view<Loc>& iv, const Deref& d) { return type(iv.dimensions(), Loc::template add_deref<Deref>::make(iv.pixels(),d)); } |
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}; |
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image_view() : _dimensions(0,0) {} |
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template <typename View> image_view(const View& iv) : _dimensions(iv.dimensions()), _pixels(iv.pixels()) {} |
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template <typename L2> image_view(const point_t& sz , const L2& loc) : _dimensions(sz), _pixels(loc) {} |
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template <typename L2> image_view(coord_t width, coord_t height, const L2& loc) : _dimensions(x_coord_t(width),y_coord_t(height)), _pixels(loc) {} |
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template <typename View> image_view& operator=(const View& iv) { _pixels=iv.pixels(); _dimensions=iv.dimensions(); return *this; } |
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image_view& operator=(const image_view& iv) { _pixels=iv.pixels(); _dimensions=iv.dimensions(); return *this; } |
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template <typename View> bool operator==(const View& v) const { return pixels()==v.pixels() && dimensions()==v.dimensions(); } |
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template <typename View> bool operator!=(const View& v) const { return !(*this==v); } |
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template <typename L2> friend void swap(image_view<L2>& x, image_view<L2>& y); |
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const point_t& dimensions() const { return _dimensions; } |
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const locator& pixels() const { return _pixels; } |
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x_coord_t width() const { return dimensions().x; } |
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y_coord_t height() const { return dimensions().y; } |
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std::size_t num_channels() const { return gil::num_channels<value_type>::value; } |
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bool is_1d_traversable() const { return _pixels.is_1d_traversable(width()); } |
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//\{@ |
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/// \name 1D navigation |
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size_type size() const { return width()*height(); } |
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iterator begin() const { return iterator(_pixels,_dimensions.x); } |
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iterator end() const { return begin()+(difference_type)size(); } // potential performance problem! |
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reverse_iterator rbegin() const { return reverse_iterator(end()); } |
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reverse_iterator rend() const { return reverse_iterator(begin()); } |
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reference operator[](difference_type i) const { return begin()[i]; } // potential performance problem! |
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iterator at(difference_type i)const { return begin()+i; } |
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iterator at(const point_t& p) const { return begin()+p.y*width()+p.x; } |
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iterator at(x_coord_t x, y_coord_t y)const { return begin()+y*width()+x; } |
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//\}@ |
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//\{@ |
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/// \name 2-D navigation |
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reference operator()(const point_t& p) const { return _pixels(p.x,p.y); } |
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reference operator()(x_coord_t x, y_coord_t y)const { return _pixels(x,y); } |
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template <std::size_t D> typename axis<D>::iterator axis_iterator(const point_t& p) const { return _pixels.axis_iterator<D>(p); } |
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xy_locator xy_at(x_coord_t x, y_coord_t y) const { return _pixels+point_t(x_coord_t(x),y_coord_t(y)); } |
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locator xy_at(const point_t& p) const { return _pixels+p; } |
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//\}@ |
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//\{@ |
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/// \name X navigation |
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x_iterator x_at(x_coord_t x, y_coord_t y) const { return _pixels.x_at(x,y); } |
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x_iterator x_at(const point_t& p) const { return _pixels.x_at(p); } |
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x_iterator row_begin(y_coord_t y) const { return x_at(0,y); } |
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x_iterator row_end(y_coord_t y) const { return x_at(width(),y); } |
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//\}@ |
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//\{@ |
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/// \name Y navigation |
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y_iterator y_at(x_coord_t x, y_coord_t y) const { return xy_at(x,y).y(); } |
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y_iterator y_at(const point_t& p) const { return xy_at(p).y(); } |
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y_iterator col_begin(x_coord_t x) const { return y_at(x,0); } |
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y_iterator col_end(x_coord_t x) const { return y_at(x,height()); } |
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//\}@ |
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private: |
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template <typename L2> friend class image_view; |
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point_t _dimensions; |
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xy_locator _pixels; |
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}; |
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template <typename L2> |
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inline void swap(image_view<L2>& x, image_view<L2>& y) { |
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using std::swap; |
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swap(x._dimensions,y._dimensions); |
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swap(x._pixels, y._pixels); // TODO: Extend further |
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} |
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///////////////////////////// |
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// PixelBasedConcept |
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///////////////////////////// |
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template <typename L> |
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struct channel_type<image_view<L> > : public channel_type<L> {}; |
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template <typename L> |
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struct color_space_type<image_view<L> > : public color_space_type<L> {}; |
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template <typename L> |
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struct channel_mapping_type<image_view<L> > : public channel_mapping_type<L> {}; |
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template <typename L> |
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struct is_planar<image_view<L> > : public is_planar<L> {}; |
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///////////////////////////// |
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// HasDynamicXStepTypeConcept |
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///////////////////////////// |
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template <typename L> |
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struct dynamic_x_step_type<image_view<L> > { |
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typedef image_view<typename dynamic_x_step_type<L>::type> type; |
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}; |
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///////////////////////////// |
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// HasDynamicYStepTypeConcept |
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///////////////////////////// |
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template <typename L> |
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struct dynamic_y_step_type<image_view<L> > { |
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typedef image_view<typename dynamic_y_step_type<L>::type> type; |
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}; |
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///////////////////////////// |
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// HasTransposedTypeConcept |
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///////////////////////////// |
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template <typename L> |
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struct transposed_type<image_view<L> > { |
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typedef image_view<typename transposed_type<L>::type> type; |
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}; |
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} } // namespace boost::gil |
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//#ifdef _MSC_VER |
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//#pragma warning(pop) |
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//#endif |
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#endif
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