diff -r 000000000000 -r 5d03bc08d59c graphicscomposition/surfaceupdate/tsrc/tcompositionbackend.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graphicscomposition/surfaceupdate/tsrc/tcompositionbackend.h	Tue Feb 02 01:47:50 2010 +0200
@@ -0,0 +1,127 @@
+// Copyright (c) 2006-2009 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:
+//
+
+/**
+ @file
+ @test
+ @internalComponent - Internal Symbian test code 
+*/
+
+
+#if !defined(__TCOMPOSITIONBACKEND_H__)
+#define __TCOMPOSITIONBACKEND_H__
+
+#include <e32base.h>
+#include <graphics/surface.h>
+#include <graphics/compositionsurfaceupdate.h>
+#include <graphics/extensioncontainer.h>
+#include "trequestorder.h"
+
+/**
+The following constants signify the delay in microseconds between two 
+emulations of composition. During the emulation mock receiver will 
+process a number of outstanding requests and issues the signal 
+back to the SUS. Content update receiver with highest priority will process the 
+requests at highest rate.
+*/
+const TInt KCompositionInterval = 1000000 / 20; // for composition threads with normal priority
+const TInt KCompositionIntervalLong = KCompositionInterval * 2; // for composition threads with lower priority
+const TInt KCompositionIntervalShort = KCompositionInterval / 2; // for composition threads with higher priority
+
+enum RequestType
+	{
+	EReqEmpty = 0,
+	EReqAvailable,
+	EReqDisplayed,
+	EReqDisplayedXTimes,	
+	};
+	
+class RequestObject
+	{
+public:
+	RequestType iType;
+	TRequestStatus* iStatus;
+	TUint32* iTimeStamp;
+	TInt iDisplayedXTimes;
+	};
+
+NONSHARABLE_CLASS(CTContentUpdateReceiver) : 
+public CExtensionContainer,
+public MCompositionSurfaceUpdate
+	{
+public:
+	static CTContentUpdateReceiver* NewL(TInt aScreen);
+	~CTContentUpdateReceiver();
+	static TInt ThreadFunction(TAny* aAny);
+	TInt Screen() {return iScreen;}
+	void Stop();
+	void SetCompositionOrder(CRequestOrder* aOrder) { iCompositionOrder = aOrder;}
+	IMPORT_C void SetVisible(TBool aVisible);
+	IMPORT_C TInt SetInternalPriority(TThreadPriority aInternalPriority);
+	inline TBool OutstandingRequest(); //returns ETrue if there are any oustanding requests need to be processed by the mock receiver
+
+	/**	
+	Mark the surface as dirty and request for composition.
+	The function doesn't take onwership of aRegion
+	*/	
+	virtual void ContentUpdated(const TSurfaceId& 	aSurface, 
+										TInt 			aBuffer, 
+										const TRegion* 	aRegion, 
+										TRequestStatus* aStatusAvailable, 
+										TRequestStatus* aStatusDisplayed, 
+										TUint32* 		aTimeStamp, 
+										TRequestStatus* aStatusDispXTimes, 
+										TInt* 			aDisplayedXTimes);
+
+	virtual void	Delete(void){}
+	virtual TInt ApiVersion(void) {return 0;}
+	virtual TVersion InternalVersion(void){return TVersion();}
+protected:  //From CBase
+    virtual TInt Extension_(TUint aExtensionId, TAny*& a0, TAny* a1);
+private:
+	CTContentUpdateReceiver(TInt aScreen);
+	void ConstructL();
+	TInt CheckNewNotifications();
+	void DoSetInternalPriorityL();
+	static TInt CallBack(TAny *aAny);
+    TInt Add(TRequestStatus *aStatus, RequestType aType, 
+            TInt aDisplayedXTimes = 1, TUint32* aTimeStamp = NULL);
+	void Remove(TInt aIndex);		
+private:
+	TThreadId iThreadId; //thread from which ContentUpdated is called
+	TThreadId iReceiverThreadId; 
+	TBool iStop;
+	TInt iScreen;
+	CPeriodic* iPeriodic;
+	RequestObject iArray[1024]; //should be big enough
+	TInt iNumberElements;
+	TBool iVisible;
+	TBool iSetInternalPriority;
+	TThreadPriority iInternalPriority;
+	CRequestOrder* iCompositionOrder;
+	RFastLock iLock;
+	RSemaphore iPriorityLock;
+	};
+
+IMPORT_C TInt StartTestUpdateReceiver(CTContentUpdateReceiver*& aReceiver, TInt aScreen);
+IMPORT_C void CloseTestUpdateReceiver(CTContentUpdateReceiver* aReceiver);
+
+
+
+inline TBool CTContentUpdateReceiver::OutstandingRequest()
+	{ return iNumberElements > 0;}
+	
+
+#endif	// __TCOMPOSITIONBACKEND_H__