| /* |
| 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_DYNAMICIMAGE_ANY_IMAGEVIEW_HPP |
| #define GIL_DYNAMICIMAGE_ANY_IMAGEVIEW_HPP |
| |
| //////////////////////////////////////////////////////////////////////////////////////// |
| /// \file |
| /// \brief Support for run-time instantiated image view |
| /// \author Lubomir Bourdev and Hailin Jin \n |
| /// Adobe Systems Incorporated |
| /// |
| /// |
| //////////////////////////////////////////////////////////////////////////////////////// |
| |
| #include "variant.hpp" |
| #include "../../image_view.hpp" |
| #include "../../image.hpp" |
| |
| namespace boost { namespace gil { |
| |
| namespace detail { |
| template <typename View> struct get_const_t { typedef typename View::const_t type; }; |
| template <typename Views> struct views_get_const_t : public mpl::transform<Views, get_const_t<mpl::_1> > {}; |
| } |
| template <typename View> struct dynamic_xy_step_type; |
| template <typename View> struct dynamic_xy_step_transposed_type; |
| |
| namespace detail { |
| struct any_type_get_num_channels { // works for both image_view and image |
| typedef int result_type; |
| template <typename T> result_type operator()(const T& v) const { return num_channels<T>::value; } |
| }; |
| struct any_type_get_dimensions { // works for both image_view and image |
| typedef point2<std::ptrdiff_t> result_type; |
| template <typename T> result_type operator()(const T& v) const { return v.dimensions(); } |
| }; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////////////// |
| /// CLASS any_image_view |
| /// |
| /// \ingroup ImageViewModel |
| /// \brief Represents a run-time specified image view. Models HasDynamicXStepTypeConcept, HasDynamicYStepTypeConcept, Note that this class does NOT model ImageViewConcept |
| /// |
| /// Represents a view whose type (color space, layout, planar/interleaved organization, etc) can be specified at run time. |
| /// It is the runtime equivalent of \p image_view. |
| /// Some of the requirements of ImageViewConcept, such as the \p value_type typedef cannot be fulfilled, since the language does not allow runtime type specification. |
| /// Other requirements, such as access to the pixels, would be inefficient to provide. Thus \p any_image_view does not fully model ImageViewConcept. |
| /// However, many algorithms provide overloads taking runtime specified views and thus in many cases \p any_image_view can be used in places taking a view. |
| /// |
| /// To perform an algorithm on any_image_view, put the algorithm in a function object and invoke it by calling \p apply_operation(runtime_view, algorithm_fn); |
| //////////////////////////////////////////////////////////////////////////////////////// |
| template <typename ImageViewTypes> |
| class any_image_view : public variant<ImageViewTypes> { |
| typedef variant<ImageViewTypes> parent_t; |
| public: |
| typedef any_image_view<typename detail::views_get_const_t<ImageViewTypes>::type> const_t; |
| typedef std::ptrdiff_t x_coord_t; |
| typedef std::ptrdiff_t y_coord_t; |
| typedef point2<std::ptrdiff_t> point_t; |
| |
| any_image_view() : parent_t() {} |
| template <typename T> explicit any_image_view(const T& obj) : parent_t(obj) {} |
| any_image_view(const any_image_view& v) : parent_t((const parent_t&)v) {} |
| |
| template <typename T> any_image_view& operator=(const T& obj) { parent_t::operator=(obj); return *this; } |
| any_image_view& operator=(const any_image_view& v) { parent_t::operator=((const parent_t&)v); return *this;} |
| |
| std::size_t num_channels() const { return apply_operation(*this, detail::any_type_get_num_channels()); } |
| point_t dimensions() const { return apply_operation(*this, detail::any_type_get_dimensions()); } |
| x_coord_t width() const { return dimensions().x; } |
| y_coord_t height() const { return dimensions().y; } |
| }; |
| |
| ///////////////////////////// |
| // HasDynamicXStepTypeConcept |
| ///////////////////////////// |
| |
| template <typename IVTypes> |
| struct dynamic_x_step_type<any_image_view<IVTypes> > { |
| typedef any_image_view<typename mpl::transform<IVTypes, dynamic_x_step_type<mpl::_1> >::type> type; |
| }; |
| |
| ///////////////////////////// |
| // HasDynamicYStepTypeConcept |
| ///////////////////////////// |
| |
| template <typename IVTypes> |
| struct dynamic_y_step_type<any_image_view<IVTypes> > { |
| typedef any_image_view<typename mpl::transform<IVTypes, dynamic_y_step_type<mpl::_1> >::type> type; |
| }; |
| |
| template <typename IVTypes> |
| struct dynamic_xy_step_type<any_image_view<IVTypes> > { |
| typedef any_image_view<typename mpl::transform<IVTypes, dynamic_xy_step_type<mpl::_1> >::type> type; |
| }; |
| |
| template <typename IVTypes> |
| struct dynamic_xy_step_transposed_type<any_image_view<IVTypes> > { |
| typedef any_image_view<typename mpl::transform<IVTypes, dynamic_xy_step_transposed_type<mpl::_1> >::type> type; |
| }; |
| |
| } } // namespace boost::gil |
| |
| #endif |