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z_order.hh
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26 
27 #ifndef MLN_DEBUG_Z_ORDER_HH
28 # define MLN_DEBUG_Z_ORDER_HH
29 
33 
34 
35 # include <mln/core/concept/image.hh>
36 
37 
38 namespace mln
39 {
40 
41  namespace debug
42  {
43 
53  template <typename I>
54  void z_order(Image<I>& input);
55 
56 
57 # ifndef MLN_INCLUDE_ONLY
58 
59 
60  // Implementations.
61 
62  namespace impl
63  {
64 
65  namespace generic
66  {
67 
68  template <typename I>
69  inline
70  void
71  z_order(Image<I>& input)
72  {
73  unsigned row, col;
74  mln_piter(I) p(input.domain());
75  for_all(p)
76  {
77  row = p.row();
78  col = p.col();
79 
80  mln_value(I)& v = input(p);
81  v = 0;
82  int mask = 0x00000001;
83  int i = 1;
84  while (row > 0 || col > 0)
85  {
86  if (i % 2)
87  {
88  if (col & 0x0000001)
89  v = v | mask;
90  col = col >> 1;
91  }
92  else
93  {
94  if (row & 0x0000001)
95  v = v | mask;
96  row = row >> 1;
97  }
98 
99  mask = mask << 1;
100  ++i;
101  }
102  }
103 
104  }
105 
106 
107  } // end of namespace mln::debug::impl::generic
108 
109 
110  } // end of namespace mln::debug::impl
111 
112 
113 
114  // Dispatch
115 
116  namespace internal
117  {
118 
119  template <typename I>
120  inline
121  void
122  z_order_dispatch(trait::image::speed::any, Image<I>& input)
123  {
124  impl::generic::z_order(input);
125  }
126 
127 
128  template <typename I>
129  inline
130  void
131  z_order_dispatch(Image<I>& input)
132  {
133  z_order_dispatch(mln_trait_image_speed(I)(), input);
134  }
135 
136  }
137 
138 
139  // Facade
140 
141  template <typename I>
142  inline
143  void
144  z_order(Image<I>& input)
145  {
146  mln_trace("debug::z_order");
147  mln_precondition(exact(input).is_valid());
148 
149  internal::z_order_dispatch(input);
150 
151  }
152 
153 # endif // ! MLN_INCLUDE_ONLY
154 
155  } // end of namespace mln::debug
156 
157 } // end of namespace mln
158 
159 
160 #endif // ! MLN_DEBUG_Z_ORDER_HH