/* | |
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 |