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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 |