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diff --git a/common/scaler/intern.h b/common/scaler/intern.h
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+/* ScummVM - Scumm Interpreter
+ * Copyright (C) 2001  Ludvig Strigeus
+ * Copyright (C) 2001-2003 The ScummVM project
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * $Header$
+ *
+ */
+
+
+#ifndef COMMON_SCALER_INTERN_H
+#define COMMON_SCALER_INTERN_H
+
+#include "stdafx.h"
+#include "common/scummsys.h"
+#include "common/scaler.h"
+#include "common/util.h"
+
+
+static const uint32 redblueMask_565 = 0xF81F;
+static const uint32 greenMask_565 = 0x07E0;
+static const uint32 redblueMask_555 = 0x7C1F;
+static const uint32 greenMask_555 = 0x03E0;
+
+
+extern uint32 colorMask;
+extern uint32 lowPixelMask;
+extern uint32 qcolorMask;
+extern uint32 qlowpixelMask;
+
+extern int gBitFormat;
+
+
+/**
+ * Interpolate two 16 bit pixels with the weights specified in the template
+ * parameters. Used by the hq scaler family.
+ */
+template<int bitFormat, int w1, int w2>
+static inline uint16 interpolate16_2(uint16 p1, uint16 p2) {
+	if (bitFormat == 565)
+		return ((((p1 & redblueMask_565) * w1 + (p2 & redblueMask_565) * w2) / (w1 + w2)) & redblueMask_565) |
+		       ((((p1 & greenMask_565) * w1 + (p2 & greenMask_565) * w2) / (w1 + w2)) & greenMask_565);
+	else // bitFormat == 555
+		return ((((p1 & redblueMask_555) * w1 + (p2 & redblueMask_555) * w2) / (w1 + w2)) & redblueMask_555) |
+		       ((((p1 & greenMask_555) * w1 + (p2 & greenMask_555) * w2) / (w1 + w2)) & greenMask_555);
+}
+
+/**
+ * Interpolate three 16 bit pixels with the weights specified in the template
+ * parameters. Used by the hq scaler family.
+ */
+template<int bitFormat, int w1, int w2, int w3>
+static inline uint16 interpolate16_3(uint16 p1, uint16 p2, uint16 p3) {
+	if (bitFormat == 565)
+		return ((((p1 & redblueMask_565) * w1 + (p2 & redblueMask_565) * w2 + (p3 & redblueMask_565) * w3) / (w1 + w2 + w3)) & redblueMask_565) |
+		       ((((p1 & greenMask_565) * w1 + (p2 & greenMask_565) * w2 + (p3 & greenMask_565) * w3) / (w1 + w2 + w3)) & greenMask_565);
+	else // bitFormat == 555
+		return ((((p1 & redblueMask_555) * w1 + (p2 & redblueMask_555) * w2 + (p3 & redblueMask_555) * w3) / (w1 + w2 + w3)) & redblueMask_555) |
+		       ((((p1 & greenMask_555) * w1 + (p2 & greenMask_555) * w2 + (p3 & greenMask_555) * w3) / (w1 + w2 + w3)) & greenMask_555);
+}
+
+
+/**
+ * Compare two YUV values (encoded 8-8-8) and check if they differ by more than
+ * a certain hard coded threshold. Used by the hq scaler family.
+ */
+static inline bool diffYUV(int yuv1, int yuv2) {
+	static const int Ymask = 0x00FF0000;
+	static const int Umask = 0x0000FF00;
+	static const int Vmask = 0x000000FF;
+	static const int trY   = 0x00300000;
+	static const int trU   = 0x00000700;
+	static const int trV   = 0x00000006;
+
+	return
+	  ( ( ABS((yuv1 & Ymask) - (yuv2 & Ymask)) > trY ) ||
+	    ( ABS((yuv1 & Umask) - (yuv2 & Umask)) > trU ) ||
+	    ( ABS((yuv1 & Vmask) - (yuv2 & Vmask)) > trV ) );
+}
+
+/**
+ * 16bit RGB to YUV conversion table. This table is setup by InitLUT().
+ * Used by the hq scaler family.
+ */
+extern int   RGBtoYUV[65536];
+
+#endif