ceph/src/boost/boost/gil/extension/dynamic_image/any_image_view.hpp

   1 /*
   2     Copyright 2005-2007 Adobe Systems Incorporated
   3
   4     Use, modification and distribution are subject to the Boost Software License,
   5     Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   6     http://www.boost.org/LICENSE_1_0.txt).
   7
   8     See http://opensource.adobe.com/gil for most recent version including documentation.
   9 */
  10
  11 /*************************************************************************************************/
  12
  13 #ifndef GIL_DYNAMICIMAGE_ANY_IMAGEVIEW_HPP
  14 #define GIL_DYNAMICIMAGE_ANY_IMAGEVIEW_HPP
  15
  16 ////////////////////////////////////////////////////////////////////////////////////////
  17 /// \file
  18 /// \brief Support for run-time instantiated image view
  19 /// \author Lubomir Bourdev and Hailin Jin \n
  20 ///         Adobe Systems Incorporated
  21 ///
  22 ///
  23 ////////////////////////////////////////////////////////////////////////////////////////
  24
  25 #include "variant.hpp"
  26 #include "../../image_view.hpp"
  27 #include "../../image.hpp"
  28
  29 namespace boost { namespace gil {
  30
  31 namespace detail {
  32     template <typename View> struct get_const_t { typedef typename View::const_t type; };
  33     template <typename Views> struct views_get_const_t : public mpl::transform<Views, get_const_t<mpl::_1> > {};
  34 }
  35 template <typename View> struct dynamic_xy_step_type;
  36 template <typename View> struct dynamic_xy_step_transposed_type;
  37
  38 namespace detail {
  39     struct any_type_get_num_channels {   // works for both image_view and image
  40         typedef int result_type;
  41         template <typename T> result_type operator()(const T& v) const { return num_channels<T>::value; }
  42     };
  43     struct any_type_get_dimensions {    // works for both image_view and image
  44         typedef point2<std::ptrdiff_t> result_type;
  45         template <typename T> result_type operator()(const T& v) const { return v.dimensions(); }
  46     };
  47 }
  48
  49 ////////////////////////////////////////////////////////////////////////////////////////
  50 /// CLASS any_image_view
  51 ///
  52 /// \ingroup ImageViewModel
  53 /// \brief Represents a run-time specified image view. Models HasDynamicXStepTypeConcept, HasDynamicYStepTypeConcept, Note that this class does NOT model ImageViewConcept
  54 ///
  55 /// Represents a view whose type (color space, layout, planar/interleaved organization, etc) can be specified at run time.
  56 /// It is the runtime equivalent of \p image_view.
  57 /// 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.
  58 /// Other requirements, such as access to the pixels, would be inefficient to provide. Thus \p any_image_view does not fully model ImageViewConcept.
  59 /// 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.
  60 ///
  61 /// 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);
  62 ////////////////////////////////////////////////////////////////////////////////////////
  63 template <typename ImageViewTypes>
  64 class any_image_view : public variant<ImageViewTypes> {
  65     typedef variant<ImageViewTypes> parent_t;
  66 public:
  67     typedef any_image_view<typename detail::views_get_const_t<ImageViewTypes>::type> const_t;
  68     typedef std::ptrdiff_t x_coord_t;
  69     typedef std::ptrdiff_t y_coord_t;
  70     typedef point2<std::ptrdiff_t> point_t;
  71
  72     any_image_view()                                                          : parent_t() {}
  73     template <typename T> explicit any_image_view(const T& obj)               : parent_t(obj) {}
  74     any_image_view(const any_image_view& v)                                   : parent_t((const parent_t&)v)    {}
  75
  76     template <typename T> any_image_view& operator=(const T& obj)             { parent_t::operator=(obj); return *this; }
  77     any_image_view&                       operator=(const any_image_view& v)  { parent_t::operator=((const parent_t&)v); return *this;}
  78
  79     std::size_t num_channels()  const { return apply_operation(*this, detail::any_type_get_num_channels()); }
  80     point_t     dimensions()    const { return apply_operation(*this, detail::any_type_get_dimensions()); }
  81     x_coord_t   width()         const { return dimensions().x; }
  82     y_coord_t   height()        const { return dimensions().y; }
  83 };
  84
  85 /////////////////////////////
  86 //  HasDynamicXStepTypeConcept
  87 /////////////////////////////
  88
  89 template <typename IVTypes>
  90 struct dynamic_x_step_type<any_image_view<IVTypes> > {
  91     typedef any_image_view<typename mpl::transform<IVTypes, dynamic_x_step_type<mpl::_1> >::type> type;
  92 };
  93
  94 /////////////////////////////
  95 //  HasDynamicYStepTypeConcept
  96 /////////////////////////////
  97
  98 template <typename IVTypes>
  99 struct dynamic_y_step_type<any_image_view<IVTypes> > {
 100     typedef any_image_view<typename mpl::transform<IVTypes, dynamic_y_step_type<mpl::_1> >::type> type;
 101 };
 102
 103 template <typename IVTypes>
 104 struct dynamic_xy_step_type<any_image_view<IVTypes> > {
 105     typedef any_image_view<typename mpl::transform<IVTypes, dynamic_xy_step_type<mpl::_1> >::type> type;
 106 };
 107
 108 template <typename IVTypes>
 109 struct dynamic_xy_step_transposed_type<any_image_view<IVTypes> > {
 110     typedef any_image_view<typename mpl::transform<IVTypes, dynamic_xy_step_transposed_type<mpl::_1> >::type> type;
 111 };
 112
 113 } }  // namespace boost::gil
 114
 115 #endif