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diff --git a/src/resources/sdlrescalefacility.h b/src/resources/sdlrescalefacility.h
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+/*
+ *  The Mana World
+ *  Copyright (C) 2004  The Mana World Development Team
+ *
+ *  This file is part of The Mana World.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the Low GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ *  Source code taken from:
+ *
+ * SDL_rotozoom - rotozoomer
+ *
+ * LGPL (c) A. Schiffler
+ *
+ */
+
+#ifndef SDLRESCALEFACILITY_H
+#define SDLRESCALEFACILITY_H
+
+#include <SDL.h>
+#include "image.h"
+
+/**
+ * _SDLzoomSurface is internally used by Image::getScaledImage() to provide
+ * a rescaled copy of its internal mImage member.
+ *
+ * @see Image::getScaledImage() for more details
+ *
+ * @param src the original surface to rescale
+ * @param zoomx the zoom factor used to rescale the surface horizontally. 1.0 doesn't rescale.
+ * A value lesser than 1.O shrink the image.
+ * @param zoomy the zoom factor used to rescale the surface vertically.
+ * @param smooth transform the scaled surface into a 32bit aliased image to smooth the rescaling.
+ *
+ * @return SDL_Surface The rescaled surface.
+ */
+
+SDL_Surface *_SDLzoomSurface(SDL_Surface * src, double zoomx, double zoomy, int smooth);
+
+#endif