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resize.hh
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26 
27 #ifndef MLN_BORDER_RESIZE_HH
28 # define MLN_BORDER_RESIZE_HH
29 
38 
39 # include <mln/core/concept/image.hh>
40 # include <mln/core/routine/duplicate.hh>
41 # include <mln/core/routine/primary.hh>
42 # include <mln/border/get.hh>
43 # include <mln/data/fill.hh>
44 
45 
46 namespace mln
47 {
48 
49  namespace border
50  {
51 
65  template <typename I>
66  void resize(const Image<I>& ima, unsigned thickness);
67 
68 
69 
70 # ifndef MLN_INCLUDE_ONLY
71 
72  namespace impl
73  {
74 
75  template <typename I>
76  inline
77  void resize(I& ima, unsigned thickness)
78  {
79  if (border::get(ima) == thickness)
80  return; // No-op.
81 
82  mln_concrete(I) memo = mln::duplicate(ima);
83  ima.resize_(thickness);
84  data::fill(ima, memo);
85 
86  mln_postcondition(border::get(ima) == thickness);
87  }
88 
89  } // end of namespace mln::border::impl
90 
91 
92  namespace internal
93  {
94 
95  template <typename I>
96  inline
97  void resize_dispatch(trait::image::ext_domain::any,
98  const Image<I>& ima, unsigned thickness)
99  {
100  // No-op.
101  (void) ima;
102  (void) thickness;
103  }
104 
105  template <typename I>
106  inline
107  void resize_dispatch(trait::image::ext_domain::extendable,
108  const Image<I>& ima, unsigned thickness)
109  {
110  // Effective resizing.
111  impl::resize(const_cast<I&>(exact(ima)), thickness);
112  }
113 
114  template <typename I>
115  inline
116  void resize_dispatch(const Image<I>& ima, unsigned thickness)
117  {
118  resize_dispatch(mln_trait_image_ext_domain(I)(),
119  ima, thickness);
120  }
121 
122  } // end of namespace mln::border::internal
123 
124 
126 
127  template <typename I>
128  inline
129  void resize(const Image<I>& ima, unsigned thickness)
130  {
131  mln_trace("border::resize");
132 
133  mln_precondition(exact(ima).is_valid());
134 
135  // Try to resize the primary image behind ima.
136  internal::resize_dispatch(primary(ima), thickness);
137 
138  }
139 
140 # endif // ! MLN_INCLUDE_ONLY
141 
142  } // end of namespace mln::border
143 
144 } // end of namespace mln
145 
146 
147 #endif // ! MLN_BORDER_RESIZE_HH