Developer Documentation

VHierarchyWindow.hh
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41
42
43
44 //=============================================================================
45 //
46 // CLASS newClass
47 //
48 //=============================================================================
49
50 #ifndef OPENMESH_VDPROGMESH_VHIERARCHYWINDOWS_HH
51 #define OPENMESH_VDPROGMESH_VHIERARCHYWINDOWS_HH
52
53
54 //== INCLUDES =================================================================
55
56 #include <OpenMesh/Tools/VDPM/VHierarchy.hh>
57 #include <algorithm>
58
59 //== FORWARDDECLARATIONS ======================================================
60
61
62 //== NAMESPACES ===============================================================
63
64 namespace OpenMesh {
65 namespace VDPM {
66
67 //== CLASS DEFINITION =========================================================
68
69
72 class VHierarchyWindow
73 {
74 private:
75
76 // reference of vertex hierarchy
77 VHierarchy *vhierarchy_;
78
79 // bits buffer (byte units)
80 unsigned char *buffer_;
81 int buffer_min_;
82 size_t buffer_max_;
83 int current_pos_;
84
85 // window (byte units)
86 int window_min_;
87 int window_max_;
88
89
90 // # of right shift (bit units)
91 unsigned char n_shift_; // [0, 7]
92
93 unsigned char flag8(unsigned char n_shift) const
94 { return 0x80 >> n_shift; }
95
96 unsigned char flag8(VHierarchyNodeHandle _node_handle) const
97 {
98 assert(_node_handle.idx() >= 0);
99 return 0x80 >> (unsigned int) (_node_handle.idx() % 8);
100 }
101 int byte_idx(VHierarchyNodeHandle _node_handle) const
102 {
103 assert(_node_handle.idx() >= 0);
104 return _node_handle.idx() / 8;
105 }
106 int buffer_idx(VHierarchyNodeHandle _node_handle) const
107 { return byte_idx(_node_handle) - buffer_min_; }
108
109 bool before_window(VHierarchyNodeHandle _node_handle) const
110 { return (_node_handle.idx()/8 < window_min_) ? true : false; }
111
112 bool after_window(VHierarchyNodeHandle _node_handle) const
113 { return (_node_handle.idx()/8 < window_max_) ? false : true; }
114
115 bool underflow(VHierarchyNodeHandle _node_handle) const
116 { return (_node_handle.idx()/8 < buffer_min_) ? true : false; }
117
118 bool overflow(VHierarchyNodeHandle _node_handle) const
119 { return (_node_handle.idx()/8 < int(buffer_max_) ) ? false : true; }
120
121 bool update_buffer(VHierarchyNodeHandle _node_handle);
122
123 public:
124 VHierarchyWindow();
125 explicit VHierarchyWindow(VHierarchy &_vhierarchy);
126 ~VHierarchyWindow(void);
127
128 void set_vertex_hierarchy(VHierarchy &_vhierarchy)
129 { vhierarchy_ = &_vhierarchy; }
130
131 void begin()
132 {
133 int new_window_min = window_min_;
134 for (current_pos_=window_min_-buffer_min_;
135 current_pos_ < window_size(); ++current_pos_)
136 {
137 if (buffer_[current_pos_] == 0)
138 ++new_window_min;
139 else
140 {
141 n_shift_ = 0;
142 while ((buffer_[current_pos_] & flag8(n_shift_)) == 0)
143 ++n_shift_;
144 break;
145 }
146 }
147 window_min_ = new_window_min;
148 }
149
150 void next()
151 {
152 ++n_shift_;
153 if (n_shift_ == 8)
154 {
155 n_shift_ = 0;
156 ++current_pos_;
157 }
158
159 while (current_pos_ < window_max_-buffer_min_)
160 {
161 if (buffer_[current_pos_] != 0) // if the current byte has non-zero bits
162 {
163 while (n_shift_ != 8)
164 {
165 if ((buffer_[current_pos_] & flag8(n_shift_)) != 0)
166 return; // find 1 bit in the current byte
167 ++n_shift_;
168 }
169 }
170 n_shift_ = 0;
171 ++current_pos_;
172 }
173 }
174 bool end() { return !(current_pos_ < window_max_-buffer_min_); }
175
176 int window_size() const { return window_max_ - window_min_; }
177 size_t buffer_size() const { return buffer_max_ - buffer_min_; }
178
179 VHierarchyNodeHandle node_handle()
180 {
181 return VHierarchyNodeHandle(8*(buffer_min_+current_pos_) + (int)n_shift_);
182 }
183
184 void activate(VHierarchyNodeHandle _node_handle)
185 {
186 update_buffer(_node_handle);
187 buffer_[buffer_idx(_node_handle)] |= flag8(_node_handle);
188 window_min_ = std::min(window_min_, byte_idx(_node_handle));
189 window_max_ = std::max(window_max_, 1+byte_idx(_node_handle));
190 }
191
192
193 void inactivate(VHierarchyNodeHandle _node_handle)
194 {
195 if (is_active(_node_handle) != true) return;
196 buffer_[buffer_idx(_node_handle)] ^= flag8(_node_handle);
197 }
198
199
200 bool is_active(VHierarchyNodeHandle _node_handle) const
201 {
202 if (before_window(_node_handle) == true ||
203 after_window(_node_handle) == true)
204 return false;
205 return ((buffer_[buffer_idx(_node_handle)] & flag8(_node_handle)) > 0);
206 }
207
208 void init(VHierarchyNodeHandleContainer &_roots);
209 void update_with_vsplit(VHierarchyNodeHandle _parent_handle);
210 void update_with_ecol(VHierarchyNodeHandle _parent_handle);
211 };
212
213 //=============================================================================
214 } // namespace VDPM
215 } // namespace OpenMesh
216 //=============================================================================
217 #endif // OPENMESH_VDPROGMESH_VHIERARCHYWINDOWS_HH
218 //=============================================================================
219
OpenMesh::VDPM::VHierarchy
Definition: VHierarchy.hh:73
OpenMesh::BaseHandle::idx
int idx() const
Get the underlying index of this handle.
Definition: Handles.hh:69
OpenMesh
Definition: MeshItems.hh:59
OpenMesh::VDPM::VHierarchyNodeHandle
Definition: VHierarchyNode.hh:77
OpenMesh::VDPM::VHierarchyNodeHandleContainer
std::vector< VHierarchyNodeHandle > VHierarchyNodeHandleContainer
Container for vertex hierarchy node handles.
Definition: VHierarchyNode.hh:183
OpenMesh::VDPM::VHierarchyWindow
Definition: VHierarchyWindow.hh:72