DecimaterT.hh 9.63 KB
Newer Older
1 2 3
/*===========================================================================*\
 *                                                                           *
 *                               OpenMesh                                    *
Jan Möbius's avatar
Jan Möbius committed
4
 *      Copyright (C) 2001-2010 by Computer Graphics Group, RWTH Aachen      *
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
 *                           www.openmesh.org                                *
 *                                                                           *
 *---------------------------------------------------------------------------* 
 *  This file is part of OpenMesh.                                           *
 *                                                                           *
 *  OpenMesh is free software: you can redistribute it and/or modify         * 
 *  it under the terms of the GNU Lesser General Public License as           *
 *  published by the Free Software Foundation, either version 3 of           *
 *  the License, or (at your option) any later version with the              *
 *  following exceptions:                                                    *
 *                                                                           *
 *  If other files instantiate templates or use macros                       *
 *  or inline functions from this file, or you compile this file and         *
 *  link it with other files to produce an executable, this file does        *
 *  not by itself cause the resulting executable to be covered by the        *
 *  GNU Lesser General Public License. This exception does not however       *
 *  invalidate any other reasons why the executable file might be            *
 *  covered by the GNU Lesser General Public License.                        *
 *                                                                           *
 *  OpenMesh is distributed in the hope that it will be useful,              *
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of           *
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the            *
 *  GNU Lesser General Public License for more details.                      *
 *                                                                           *
 *  You should have received a copy of the GNU LesserGeneral Public          *
 *  License along with OpenMesh.  If not,                                    *
 *  see <http://www.gnu.org/licenses/>.                                      *
 *                                                                           *
\*===========================================================================*/ 

/*===========================================================================*\
 *                                                                           *             
 *   $Revision$                                                         *
 *   $Date$                   *
 *                                                                           *
\*===========================================================================*/
Jan Möbius's avatar
Jan Möbius committed
41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86

/** \file DecimaterT.hh
 */

//=============================================================================
//
//  CLASS DecimaterT
//
//=============================================================================

#ifndef OPENMESH_DECIMATER_DECIMATERT_HH
#define OPENMESH_DECIMATER_DECIMATERT_HH


//== INCLUDES =================================================================

#include <memory>

#include <OpenMesh/Core/Utils/Property.hh>
#include <OpenMesh/Tools/Utils/HeapT.hh>
#include <OpenMesh/Tools/Decimater/ModBaseT.hh>



//== NAMESPACE ================================================================

namespace OpenMesh  {
namespace Decimater {


//== CLASS DEFINITION =========================================================


/** Decimater framework.
    \see BaseModT, \ref decimater_docu
*/
template < typename MeshT >
class DecimaterT
{
public: //-------------------------------------------------------- public types

  typedef DecimaterT< MeshT >        Self;
  typedef MeshT                      Mesh;
  typedef CollapseInfoT<MeshT>       CollapseInfo;
  typedef ModBaseT<Self>             Module;
  typedef std::vector< Module* >     ModuleList;
87
  typedef typename ModuleList::iterator ModuleListIterator;
Jan Möbius's avatar
Jan Möbius committed
88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127

public: //------------------------------------------------------ public methods

  /// Constructor
  DecimaterT( Mesh& _mesh );

  /// Destructor
  ~DecimaterT();


  /** Initialize decimater and decimating modules.

      Return values:
      true   ok
      false  No ore more than one non-binary module exist. In that case
             the decimater is uninitialized!
   */
  bool initialize();


  /// Returns whether decimater has been successfully initialized.
  bool is_initialized() const { return initialized_; }


  /// Print information about modules to _os
  void info( std::ostream& _os );

public: //--------------------------------------------------- module management

  /// access mesh. used in modules.
  Mesh& mesh() { return mesh_; }

  /// add module to decimater
  template < typename _Module >
  bool add( ModHandleT<_Module>& _mh )
  {
    if (_mh.is_valid())
      return false;

    _mh.init( new _Module(*this) );
128
    all_modules_.push_back( _mh.module() );
Jan Möbius's avatar
Jan Möbius committed
129

130 131
    set_uninitialized();
    
Jan Möbius's avatar
Jan Möbius committed
132 133 134 135 136 137 138 139 140 141 142
    return true;
  }


  /// remove module
  template < typename _Module >
  bool remove( ModHandleT<_Module>& _mh )
  {
    if (!_mh.is_valid())
      return false;

143 144 145
    typename ModuleList::iterator it = std::find(all_modules_.begin(),
                                                 all_modules_.end(),
                                                 _mh.module() );
Jan Möbius's avatar
Jan Möbius committed
146

147
    if ( it == all_modules_.end() ) // module not found
Jan Möbius's avatar
Jan Möbius committed
148 149 150
      return false;

    delete *it;
151
    all_modules_.erase( it ); // finally remove from list
Jan Möbius's avatar
Jan Möbius committed
152 153
    _mh.clear();

154
    set_uninitialized();
Jan Möbius's avatar
Jan Möbius committed
155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250
    return true;
  }


  /// get module referenced by handle _mh
  template < typename Module >
  Module& module( ModHandleT<Module>& _mh )
  {
    assert( _mh.is_valid() );
    return *_mh.module();
  }

public:

  /** Decimate (perform _n_collapses collapses). Return number of
      performed collapses. If _n_collapses is not given reduce as
      much as possible */
  size_t decimate( size_t _n_collapses = 0 );

  /// Decimate to target complexity, returns number of collapses
  size_t decimate_to( size_t  _n_vertices )
  {
    return ( (_n_vertices < mesh().n_vertices()) ?
	     decimate( mesh().n_vertices() - _n_vertices ) : 0 );
  }


private:

  void update_modules(CollapseInfo& _ci)
  {
    typename ModuleList::iterator m_it, m_end = bmodules_.end();
    for (m_it = bmodules_.begin(); m_it != m_end; ++m_it)
      (*m_it)->postprocess_collapse(_ci);
    cmodule_->postprocess_collapse(_ci);
  }

public:

  typedef typename Mesh::VertexHandle    VertexHandle;
  typedef typename Mesh::HalfedgeHandle  HalfedgeHandle;

  /// Heap interface
  class HeapInterface
  {
  public:

    HeapInterface(Mesh&               _mesh,
      VPropHandleT<float> _prio,
      VPropHandleT<int>   _pos)
      : mesh_(_mesh), prio_(_prio), pos_(_pos)
    { }

    inline bool
    less( VertexHandle _vh0, VertexHandle _vh1 )
    { return mesh_.property(prio_, _vh0) < mesh_.property(prio_, _vh1); }

    inline bool
    greater( VertexHandle _vh0, VertexHandle _vh1 )
    { return mesh_.property(prio_, _vh0) > mesh_.property(prio_, _vh1); }

    inline int
    get_heap_position(VertexHandle _vh)
    { return mesh_.property(pos_, _vh); }

    inline void
    set_heap_position(VertexHandle _vh, int _pos)
    { mesh_.property(pos_, _vh) = _pos; }


  private:
    Mesh&                mesh_;
    VPropHandleT<float>  prio_;
    VPropHandleT<int>    pos_;
  };

  typedef Utils::HeapT<VertexHandle, HeapInterface>  DeciHeap;


private: //---------------------------------------------------- private methods

  /// Insert vertex in heap
  void heap_vertex(VertexHandle _vh);

  /// Is an edge collapse legal?  Performs topological test only.
  /// The method evaluates the status bit Locked, Deleted, and Feature.
  /// \attention The method temporarily sets the bit Tagged. After usage
  ///            the bit will be disabled!
  bool is_collapse_legal(const CollapseInfo& _ci);

  /// Calculate priority of an halfedge collapse (using the modules)
  float collapse_priority(const CollapseInfo& _ci);

  /// Post-process a collapse
  void postprocess_collapse(CollapseInfo& _ci);

251 252 253 254 255 256
  // Reset the initialized flag, and clear the bmodules_ and cmodule_
  void set_uninitialized() {
    initialized_ = false;
    cmodule_ = 0;
    bmodules_.clear();
  }
Jan Möbius's avatar
Jan Möbius committed
257 258 259 260 261 262 263 264 265 266 267


private: //------------------------------------------------------- private data


  // reference to mesh
  Mesh&      mesh_;

  // heap
  std::auto_ptr<DeciHeap> heap_;

268
  // list of binary modules
Jan Möbius's avatar
Jan Möbius committed
269
  ModuleList bmodules_;
270 271

  // the current priority module
Jan Möbius's avatar
Jan Möbius committed
272 273
  Module*    cmodule_;

274 275 276
  // list of all allocated modules (including cmodule_ and all of bmodules_)
  ModuleList all_modules_;
    
Jan Möbius's avatar
Jan Möbius committed
277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305
  bool       initialized_;


  // vertex properties
  VPropHandleT<HalfedgeHandle>  collapse_target_;
  VPropHandleT<float>           priority_;
  VPropHandleT<int>             heap_position_;



private: // Noncopyable

  DecimaterT(const Self&);
  Self& operator = (const Self&);

};

//=============================================================================
} // END_NS_DECIMATER
} // END_NS_OPENMESH
//=============================================================================
#if defined(OM_INCLUDE_TEMPLATES) && !defined(OPENMESH_DECIMATER_DECIMATERT_CC)
#define OPENMESH_DECIMATER_TEMPLATES
#include "DecimaterT.cc"
#endif
//=============================================================================
#endif // OPENMESH_DECIMATER_DECIMATERT_HH defined
//=============================================================================