1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/os/graphics/windowing/windowserver/nga/SERVER/regionextend.h	Fri Jun 15 03:10:57 2012 +0200
     1.3 @@ -0,0 +1,86 @@
     1.4 +// Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).
     1.5 +// All rights reserved.
     1.6 +// This component and the accompanying materials are made available
     1.7 +// under the terms of "Eclipse Public License v1.0"
     1.8 +// which accompanies this distribution, and is available
     1.9 +// at the URL "http://www.eclipse.org/legal/epl-v10.html".
    1.10 +//
    1.11 +// Initial Contributors:
    1.12 +// Nokia Corporation - initial contribution.
    1.13 +//
    1.14 +// Contributors:
    1.15 +//
    1.16 +// Description:
    1.17 +//
    1.18 +
    1.19 +#ifndef TREGIONEXTEND_H_
    1.20 +#define TREGIONEXTEND_H_
    1.21 +
    1.22 +#include <e32std.h>
    1.23 +
    1.24 +class TRegionExtend : public TRegion
    1.25 +	{
    1.26 +	//Note that this class is generally only good for regions with dimensions less than 45000x45000
    1.27 +	//as integers are used to hold the final total area, and would overflow.
    1.28 +	//In debug build, panic TRegionExtend x003 is raised, where x indicates a code-point
    1.29 +	// when any rectangle in the region exceeds 32k
    1.30 +	
    1.31 +private:
    1.32 +	//Do not construct instances of this class, use the Cast() methods to convert existing region instances
    1.33 +	TRegionExtend();
    1.34 +	TRegionExtend(const TRegionExtend&);
    1.35 +public:
    1.36 +	//Please use TRegionExtend::Cast() calls to extend existing TRegion objects
    1.37 +	static TRegionExtend& 		Cast(TRegion& aSrc)			{	return (TRegionExtend&) aSrc;	}
    1.38 +	static TRegionExtend* 		Cast(TRegion* aSrc)			{	return (TRegionExtend*) aSrc;	}
    1.39 +	static const TRegionExtend& Cast(const TRegion& aSrc)	{	return (const TRegionExtend&) aSrc;	}
    1.40 +	static const TRegionExtend* Cast(const TRegion* aSrc)	{	return (const TRegionExtend*) aSrc;	}
    1.41 +	
    1.42 +public:
    1.43 +	using	TRegion::RectangleListW;
    1.44 +	enum TOverlapFlags
    1.45 +		{
    1.46 +		EExact=			0x0000,
    1.47 +		ESub=			0x0001,	
    1.48 +		EAdd=			0x0002,
    1.49 +		EDiffers=		0x0003,	//Added and/or subtracted
    1.50 +		ENoIntersect=	0x0004,
    1.51 +		EErrorRegion=	0x0008	//This code is returned if one of the input regions is flagged as invalid
    1.52 +		};
    1.53 +
    1.54 +	/** Avoids the use of a temp region by performing area calc on the fly.
    1.55 +	 * If both regions are empty then EOverlapNoIntersect only is returned.
    1.56 +	 * Limitation: this method is only good for regions with less than 2 billion units of area!
    1.57 +	 * @param aTarget	target region for difference
    1.58 +	 **/
    1.59 +	TOverlapFlags	TestDifference(const TRegion& aTarget)const;
    1.60 +	
    1.61 +	/** Further avoids the use of a temp region by performing area calc on the fly.
    1.62 +	 * If both regions are empty then EOverlapNoIntersect only is returned.
    1.63 +	 * Limitation: this method is only good for regions with less than 2 billion units of area!
    1.64 +	 * @param aTarget	target region for difference
    1.65 +	 * @param aOffset	origin offset transformation from this to target region
    1.66 +	 **/
    1.67 +	TOverlapFlags	TestDifference(const TRegion& aTarget,TPoint aOffset )const;
    1.68 +	
    1.69 +	/** Avoids the use of a temp region by performing area calc on the fly.
    1.70 +	 * If region and rect both empty then EOverlapNoIntersect only is returned.
    1.71 +	 * Limitation: this method is only good for regions and rects with less than 2 billion units of area!
    1.72 +	 **/
    1.73 +	TOverlapFlags	TestDifference(const TRect&)const;
    1.74 +	
    1.75 +	/** Intended as an internal method to test for the overlap of two rectangles.
    1.76 +	 * 
    1.77 +	 **/
    1.78 +	static TOverlapFlags TestDifference(const TRect&,const TRect&);
    1.79 +	
    1.80 +	/** Returns total area of the region
    1.81 +	 * Limitation: this method is only good for regions with less than 2 billion units of area!
    1.82 +	 **/
    1.83 +	TUint	Area()const;
    1.84 +	
    1.85 +
    1.86 +protected:
    1.87 +	};
    1.88 +
    1.89 +#endif /*TREGIONEXTEND_H_*/