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diff --git a/modules/librender/scaler_hq2x.h b/modules/librender/scaler_hq2x.h
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+/*
+ *  Copyright © 2006-2013 SplinterGU (Fenix/Bennugd)
+ *  Copyright © 2002-2006 Fenix Team (Fenix)
+ *  Copyright © 1999-2002 José Luis Cebrián Pagüe (Fenix)
+ *
+ *  This file is part of Bennu - Game Development
+ *
+ *  This software is provided 'as-is', without any express or implied
+ *  warranty. In no event will the authors be held liable for any damages
+ *  arising from the use of this software.
+ *
+ *  Permission is granted to anyone to use this software for any purpose,
+ *  including commercial applications, and to alter it and redistribute it
+ *  freely, subject to the following restrictions:
+ *
+ *     1. The origin of this software must not be misrepresented; you must not
+ *     claim that you wrote the original software. If you use this software
+ *     in a product, an acknowledgment in the product documentation would be
+ *     appreciated but is not required.
+ *
+ *     2. Altered source versions must be plainly marked as such, and must not be
+ *     misrepresented as being the original software.
+ *
+ *     3. This notice may not be removed or altered from any source
+ *     distribution.
+ *
+ */
+
+#ifndef __SCALER_HQ2X_H
+#define __SCALER_HQ2X_H
+
+/* Rutinas del ScummVM's HQ2x algorithm */
+
+extern void hq2x( uint8_t *srcPtr, uint32_t srcPitch, uint8_t *dstPtr, uint32_t dstPitch, int width, int height );
+
+#define SCALE_HQ2X          0x0002
+
+#endif