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diff --git a/source/blender/freestyle/intern/geometry/GridHelpers.cpp b/source/blender/freestyle/intern/geometry/GridHelpers.cpp
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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 *****
+ */
+
+/** \file blender/freestyle/intern/geometry/GridHelpers.cpp
+ *  \ingroup freestyle
+ *  \brief Class to define a cell grid surrounding the projected image of a scene
+ *  \author Alexander Beels
+ *  \date 2010-12-21
+ */
+
+#include <math.h>
+
+#include "GridHelpers.h"
+
+void GridHelpers::getDefaultViewProscenium(real viewProscenium[4])
+{
+	// Get proscenium boundary for culling
+	// bufferZone determines the amount by which the area processed should exceed the actual image area.
+	// This is intended to avoid visible artifacts generated along the proscenium edge.
+	// Perhaps this is no longer needed now that entire view edges are culled at once, since that theoretically
+	// should eliminate visible artifacts.
+	// To the extent it is still useful, bufferZone should be put into the UI as configurable percentage value
+	const real bufferZone = 0.05;
+	// borderZone describes a blank border outside the proscenium, but still inside the image area.
+	// Only intended for exposing possible artifacts along or outside the proscenium edge during debugging.
+	const real borderZone = 0.0;
+	viewProscenium[0] = freestyle_viewport[2] * (borderZone - bufferZone);
+	viewProscenium[1] = freestyle_viewport[2] * (1.0f - borderZone + bufferZone);
+	viewProscenium[2] = freestyle_viewport[3] * (borderZone - bufferZone);
+	viewProscenium[3] = freestyle_viewport[3] * (1.0f - borderZone + bufferZone);
+}
+
+GridHelpers::Transform::~Transform ()
+{
+}