graphicscomposition/openwfsupport/inc/contentupdateproxy.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 01:47:50 +0200
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// Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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// contentupdateproxy.h
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// Proxy object for receiving SUS surface content update notifications and rerouting them to nativestream 
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//
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#ifndef COMPBACKUPDATEPROXY_H
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#define COMPBACKUPDATEPROXY_H
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#include <e32cmn.h>
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#include <e32base.h>
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#include <graphics/compositionsurfaceupdate.h>
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#include <graphics/extensioncontainer.h>
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class TSurfaceId;
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class MRectangle;
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class TRegion;
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class COpenWfcStreamMap;
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class CSurfaceStream;
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#define KContentUpdateProxyVersion 3 
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NONSHARABLE_CLASS(CContentUpdateProxy) : public CExtensionContainer, public MCompositionSurfaceUpdate
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	{
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public:
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	static CExtensionContainer* NewL(TInt aScreenNum, COpenWfcStreamMap*	aSingleton,TInt aInternalVersion,TInt aPriority);
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/*-------------------------------------------------------------------*//*!
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 * \brief   Gets the API version number of the
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 *          MCompositionSurfaceUpdate implementation.
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 *
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 * @return  1 for Oghma conformant implementation,
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 *          2 for Sphinx.
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 *          3 for OpenWF-C
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 *//*-------------------------------------------------------------------*/
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    virtual TInt        ApiVersion          (void) ;
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/*-------------------------------------------------------------------*//*!
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 * \brief   Gets the internal version number of the
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 *          MCompositionSurfaceUpdate implementation.
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 *
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 * @return  The version number of the MCompositionSurfaceUpdate
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 *          instance.
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 *//*-------------------------------------------------------------------*/
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    virtual TVersion    InternalVersion     (void) ;
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/*-------------------------------------------------------------------*//*!
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 * \brief   A function that responds to surface content notifications.
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 *
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 * When the contents of a surface change, this function gets called
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 * by a mechanism that is an implementation detail of the graphics
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 * driver together with the MCompositionSurfaceUpdate implementation. The
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 * call can originate from different processes and the
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 * MCompositionSurfaceUpdate together with the surface implementation
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 * relays the information content of it, through implementation
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 * specific means, to trigger the actual composition soon after this
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 * call - this composition call should be synchronized with the
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 * refresh rate of the screen.
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 *
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 * @param   aSurface            The surface that has been updated.
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 * @param   aBuffer             The buffer of the surface to be used in
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 *                              composition. Integer starting from 0.
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 * @param   aRegion             The sub-area that has the updates. If NULL, the
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 *                              whole surface is considered changed.
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 * @param   aStatusConsumed     A request status object or NULL. If not NULL, then the
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 *                              request status is completed once the backend
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 *                              does not anymore need the contents of the
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 *                              surface to render the update. This may happen
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 *                              before actually displaying the finished frame.
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 * @param   aStatusDisplayed    This is signaled after the composited frame
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 *                              is posted the to display for the first time after
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 *                              the update. After this the value in
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 *                              aTimeStamp is valid, if the value in the
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 *                              status object is KErrNone. Can be NULL, if
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 *                              no signal is desired.
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 * @param   aTimeStamp          Value of the User::FastCounter() right after the
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 *                              display refresh that signaled aStatusDisplayed.
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 * @param   aStatusDispXTimes   This is signaled when the surface has been on
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 *                              the screen for aDisplayedXTimes refreshes,
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 *                              including the update that signaled aStatusDisplayed.
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 *                              Can be NULL, if no signal is wanted.
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 * @param   aDisplayedXTimes    The number of refreshes after which aStatusDispXTimes
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 *                              is signaled or NULL. If values is provided, it must be
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 *                              >= 1.
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 *
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 * @pre     The MCompositionSurfaceUpdate implementation is waiting for content
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 *          update notifications.
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 * @pre     aSurface.IsNull() returns EFalse.
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 * @pre     The surface aSurface is registered with the backend or all status
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 *          requests are completed with KErrArgument.
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 * @pre     Either both aStatusDisplayed and aTimeStamp are NULL or neither
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 *          of them are.
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 * @pre     Either both aStatusDispXTimes and aDisplayedXTimes are NULL or
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 *          neither of them are.
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 * @post    The MCompositionSurfaceUpdate is waiting for vsync or another
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 *          synchronisation method to trigger composition,
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 *          depending on cached visibility information.
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 * @note    The updated region is used only as an optimisation hint.
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 *          the current contents of the surface are always used for
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 *          composition independent of the aRegion.
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 * @see     Surface Update API Specification [R6] for further details
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 *          about the semantics of the parameters and return values
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 *          of the TRequestStatus objects.
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 *//*-------------------------------------------------------------------*/
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    virtual void        ContentUpdated      (const TSurfaceId&  aSurface,
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                                             TInt               aBuffer,
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                                             const TRegion*     aRegion,
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                                             TRequestStatus*    aStatusConsumed,
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                                             TRequestStatus*    aStatusDisplayed,
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                                             TUint32*           aTimeStamp,
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                                             TRequestStatus*    aStatusDispXTimes,
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                                             TInt*              aDisplayedXTimes) ;
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public:
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    void RegisterNotifications(CSurfaceStream& aNs,
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                               TInt            aBuffer,
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                               TRequestStatus* aStatusDisplayed, TUint32* aTimeStamp,
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                               TRequestStatus* aStatusDispXTimes, TInt* aDisplayedXTimes,
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                               TRequestStatus* aStatusConsumed, const TRegion* aRegion);   
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private:	//methods
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	void ConstructL(TInt aScreenNum, COpenWfcStreamMap*	aSingleton,TInt aInternalVersio,TInt aPriority);
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	CContentUpdateProxy();
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	~CContentUpdateProxy();
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	void CompleteStatus(TRequestStatus* aStatusConsumed,TRequestStatus* aStatusDisplayed,
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	        TRequestStatus* aStatusDispXTimes,TInt aReason);
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	virtual TInt Extension_(TUint aExtensionId, TAny*& a0, TAny* a1);
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private:	//data
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	TInt				iScreenNum;
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	TInt				iInternalVersion;
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	TInt				iPriority;
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	COpenWfcStreamMap*	iSingleton;
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	RHeap&              iHeap;
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	};
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#endif /*COMPBACKUPDATEPROXY_*/