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+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * 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.
+ *
+ * The Original Code is Copyright (C) 2010 Blender Foundation.
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): none yet.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#ifndef __FASTGRID_H__
+#define __FASTGRID_H__
+
+/** \file blender/freestyle/intern/geometry/FastGrid.h
+ *  \ingroup freestyle
+ *  \brief Class to define a cell grid surrounding the bounding box of the scene
+ *  \author Stephane Grabli
+ *  \date 30/07/2002
+ */
+
+#include <cassert>
+
+#include "Grid.h"
+
+/*! Class to define a regular grid used for ray casting computations 
+ *  We don't use a hashtable here. The grid is explicitly stored for faster computations.
+ *  However, this might result in significant increase in memory usage (compared to the regular grid)
+ */
+class LIB_GEOMETRY_EXPORT FastGrid : public Grid
+{
+public:
+	FastGrid() : Grid()
+	{
+		_cells = NULL;
+		_cells_size = 0;
+	}
+
+	virtual ~FastGrid()
+	{
+		clear();
+	}
+
+	/*! clears the grid
+	 *  Deletes all the cells, clears the hashtable, resets size, size of cell, number of cells.
+	 */
+	virtual void clear();
+
+	/*! Sets the different parameters of the grid
+	 *    orig
+	 *      The grid origin
+	 *    size
+	 *      The grid's dimensions
+	 *    nb
+	 *      The number of cells of the grid
+	 */
+	virtual void configure(const Vec3r& orig, const Vec3r& size, unsigned nb);
+
+	/*! returns the cell whose coordinates are pased as argument */
+	Cell* getCell(const Vec3u& p);
+
+	/*! Fills the case p with the cell iCell */
+	virtual void fillCell(const Vec3u& p, Cell& cell);
+
+protected:
+	Cell **_cells;
+	unsigned _cells_size;
+};
+
+#endif // __FASTGRID_H__