/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

#ifndef __FREESTYLE_OCCLUDER_SOURCE_H__
#define __FREESTYLE_OCCLUDER_SOURCE_H__

/** \file
 * \ingroup freestyle
 * \brief Class to define a cell grid surrounding the projected image of a scene
 */

#include "../geometry/GridHelpers.h"

#include "../winged_edge/WEdge.h"

#ifdef WITH_CXX_GUARDEDALLOC
#  include "MEM_guardedalloc.h"
#endif

namespace Freestyle {

class OccluderSource {
  // Disallow copying and assignment
  OccluderSource(const OccluderSource &other);
  OccluderSource &operator=(const OccluderSource &other);

 public:
  OccluderSource(const GridHelpers::Transform &transform, WingedEdge &we);
  virtual ~OccluderSource();

  void begin();
  virtual bool next();
  bool isValid();

  WFace *getWFace();
  Polygon3r getCameraSpacePolygon();
  Polygon3r &getGridSpacePolygon();

  virtual void getOccluderProscenium(real proscenium[4]);
  virtual real averageOccluderArea();

 protected:
  WingedEdge &wingedEdge;
  vector<WShape *>::const_iterator currentShape, shapesEnd;
  vector<WFace *>::const_iterator currentFace, facesEnd;

  bool valid;

  Polygon3r cachedPolygon;
  const GridHelpers::Transform &transform;

  void buildCachedPolygon();

#ifdef WITH_CXX_GUARDEDALLOC
  MEM_CXX_CLASS_ALLOC_FUNCS("Freestyle:OccluderSource")
#endif
};

} /* namespace Freestyle */

#endif  // __FREESTYLE_OCCLUDER_SOURCE_H__