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directional.hh
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26 
27 #ifndef MLN_CANVAS_BROWSING_DIRECTIONAL_HH
28 # define MLN_CANVAS_BROWSING_DIRECTIONAL_HH
29 
33 
34 # include <mln/core/concept/browsing.hh>
35 # include <mln/core/concept/image.hh>
36 
37 namespace mln
38 {
39 
40  namespace canvas
41  {
42 
43  namespace browsing
44  {
45 
91  struct directional_t : public Browsing< directional_t >
92  {
93  // This default constructor is needed for compilation with gcc
94  // 4.6.0, gcc 4.6.1 and Clang.
95  directional_t();
96 
97  template <typename F>
98  void operator()(F& f) const;
99  };
100 
101  extern const directional_t directional;
102 
103 # ifndef MLN_INCLUDE_ONLY
104 
105 # ifndef MLN_WO_GLOBAL_VARS
106 
108 
109 # endif // ! MLN_WO_GLOBAL_VARS
110 
111  inline
113  {
114  }
115 
116  template <typename F>
117  inline
118  void
119  directional_t::operator()(F& f) const
120  {
121  mln_trace("canvas::browsing::directional");
122  mln_precondition(f.dir < f.dim);
123  typedef typename F::I I;
124 
125  mln_psite(I)
126  pmin = f.input.domain().pmin(),
127  pmax = f.input.domain().pmax();
128 
129  f.p = pmin;
130 
131  f.init();
132 
133  do
134  {
135 
136  // Browse the run
137  f.init_run();
138  while (f.p[f.dir] <= pmax[f.dir])
139  {
140  f.next();
141  ++f.p[f.dir];
142  }
143  f.p[f.dir] = pmin[f.dir];
144 
145 
146  // Select the next run start
147  for (int c = F::dim - 1; c >= 0; --c)
148  {
149  if (c == int(f.dir))
150  continue;
151  if (f.p[c] != pmax[c])
152  {
153  ++f.p[c];
154  break;
155  }
156  f.p[c] = pmin[c];
157  }
158 
159  } while (f.p != pmin);
160 
161  f.final();
162  }
163 
164 # endif // ! MLN_INCLUDE_ONLY
165 
166  } // end of namespace mln::canvas::browsing
167 
168  } // end of namespace mln::canvas
169 
170 } // end of namespace mln
171 
172 #endif // ! MLN_CANVAS_BROWSING_DIRECTIONAL_HH