--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/windowing/windowserver/nga/SERVER/regionextend.h	Tue Feb 02 01:47:50 2010 +0200
@@ -0,0 +1,86 @@
+// Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of "Eclipse Public License v1.0"
+// which accompanies this distribution, and is available
+// at the URL "http://www.eclipse.org/legal/epl-v10.html".
+//
+// Initial Contributors:
+// Nokia Corporation - initial contribution.
+//
+// Contributors:
+//
+// Description:
+//
+
+#ifndef TREGIONEXTEND_H_
+#define TREGIONEXTEND_H_
+
+#include <e32std.h>
+
+class TRegionExtend : public TRegion
+	{
+	//Note that this class is generally only good for regions with dimensions less than 45000x45000
+	//as integers are used to hold the final total area, and would overflow.
+	//In debug build, panic TRegionExtend x003 is raised, where x indicates a code-point
+	// when any rectangle in the region exceeds 32k
+	
+private:
+	//Do not construct instances of this class, use the Cast() methods to convert existing region instances
+	TRegionExtend();
+	TRegionExtend(const TRegionExtend&);
+public:
+	//Please use TRegionExtend::Cast() calls to extend existing TRegion objects
+	static TRegionExtend& 		Cast(TRegion& aSrc)			{	return (TRegionExtend&) aSrc;	}
+	static TRegionExtend* 		Cast(TRegion* aSrc)			{	return (TRegionExtend*) aSrc;	}
+	static const TRegionExtend& Cast(const TRegion& aSrc)	{	return (const TRegionExtend&) aSrc;	}
+	static const TRegionExtend* Cast(const TRegion* aSrc)	{	return (const TRegionExtend*) aSrc;	}
+	
+public:
+	using	TRegion::RectangleListW;
+	enum TOverlapFlags
+		{
+		EExact=			0x0000,
+		ESub=			0x0001,	
+		EAdd=			0x0002,
+		EDiffers=		0x0003,	//Added and/or subtracted
+		ENoIntersect=	0x0004,
+		EErrorRegion=	0x0008	//This code is returned if one of the input regions is flagged as invalid
+		};
+
+	/** Avoids the use of a temp region by performing area calc on the fly.
+	 * If both regions are empty then EOverlapNoIntersect only is returned.
+	 * Limitation: this method is only good for regions with less than 2 billion units of area!
+	 * @param aTarget	target region for difference
+	 **/
+	TOverlapFlags	TestDifference(const TRegion& aTarget)const;
+	
+	/** Further avoids the use of a temp region by performing area calc on the fly.
+	 * If both regions are empty then EOverlapNoIntersect only is returned.
+	 * Limitation: this method is only good for regions with less than 2 billion units of area!
+	 * @param aTarget	target region for difference
+	 * @param aOffset	origin offset transformation from this to target region
+	 **/
+	TOverlapFlags	TestDifference(const TRegion& aTarget,TPoint aOffset )const;
+	
+	/** Avoids the use of a temp region by performing area calc on the fly.
+	 * If region and rect both empty then EOverlapNoIntersect only is returned.
+	 * Limitation: this method is only good for regions and rects with less than 2 billion units of area!
+	 **/
+	TOverlapFlags	TestDifference(const TRect&)const;
+	
+	/** Intended as an internal method to test for the overlap of two rectangles.
+	 * 
+	 **/
+	static TOverlapFlags TestDifference(const TRect&,const TRect&);
+	
+	/** Returns total area of the region
+	 * Limitation: this method is only good for regions with less than 2 billion units of area!
+	 **/
+	TUint	Area()const;
+	
+
+protected:
+	};
+
+#endif /*TREGIONEXTEND_H_*/