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diff --git a/gui/animation/Interpolator.h b/gui/animation/Interpolator.h
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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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.
+ *
+ */
+
+// Based on code by omergilad.
+
+#ifndef GUI_ANIMATION_INTERPOLATOR_H
+#define GUI_ANIMATION_INTERPOLATOR_H
+
+#include "common/ptr.h"
+
+namespace GUI {
+
+class Interpolator {
+public:
+	Interpolator() {}
+	virtual ~Interpolator() {}
+
+	virtual float interpolate(float linearValue) = 0;
+};
+
+typedef Common::SharedPtr<Interpolator> InterpolatorPtr;
+
+} // End of namespace GUI
+
+#endif /* GUI_ANIMATION_INTERPOLATOR_H */