// 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:

 //

 /**

  @file

  @internalComponent

 */

 #ifndef MMFSUBTITLEGRAPHICDRAWER_H

 #define MMFSUBTITLEGRAPHICDRAWER_H

 #include <bitstd.h>

 #include <graphics/wsgraphicdrawer.h>

 #include <graphics/wsgraphicdrawerinterface.h>

 #include "mmfsubtitlegraphicmessage.h"

 /**

  * Forward declarations

  */

 class TSubtitleGraphicState;

 /** 

 Defines the MMF subtitle graphic drawer CRP component.  Used to display subtitles 

 over video content.  

 */

 NONSHARABLE_CLASS(CMMFSubtitleGraphicDrawer): public CWsGraphicDrawer

     {  

 public:

     enum {EImplUid = 0x10285C9C};

 public:

 	virtual ~CMMFSubtitleGraphicDrawer();

     static CMMFSubtitleGraphicDrawer* NewL();

 	// From CwsGraphicDrawer

     void ConstructL(MWsGraphicDrawerEnvironment& aEnv,const TGraphicDrawerId& aId, MWsClient& aOwner, const TDesC8& aData);

     virtual void HandleMessage(const TDesC8& aData);

     virtual void DoDraw(MWsGc& aGc, const TRect& aRect, const TDesC8& aData) const;

 private:

 	// Message handling..

 	void ProcessMessageInit(TSubtitleCrpMsgInit& aMessage);

 	void ProcessMessageDrawFrame(TSubtitleCrpMsgDrawFrame& aMessage);

 	void ProcessMessageSwapFrame(TSubtitleCrpMsgRenderSwapFrame& aMessage);

 	void DoBitBlt(MWsGc& aGc, const TRect& aRect) const;

 private:

     enum TSubtitleGraphicState

 		{

 		ESubtitleGraphicStateWaiting    			= 0,

 		ESubtitleGraphicStateInit 					= 10,

 		ESubtitleGraphicStateInitSimple 			= 20,

 		ESubtitleGraphicStateDrawFrame 				= 30,

 		ESubtitleGraphicStateRefreshContent			= 40,

 		ESubtitleGraphicStateSwapFrame 				= 50,

 		ESubtitleGraphicStateClear					= 60

 		};

 	enum TSubtitleGraphicFrame

 		{

 		ESubtitleGraphicFrame1 = 1,

 		ESubtitleGraphicFrame2 = 2,

 		ESubtitleGraphicFrame3 = 3

 		};

 private:

 	/**

 	Handles to subtitle frames.

 	Used for double-buffered rendering approach 

 	@see CWsInterleaveGraphicDrawer::ProcessMessageInit()

 	*/

     CFbsBitmap* iBitmap1;

     CFbsBitmap* iBitmap2; 

     /**

     Used to store one-off subtitle rendering requests

     @see CWsInterleaveGraphicDrawer::ProcessMessageDrawFrame()

     */

     CFbsBitmap* iTempBitmap;

     /**

     Status of current bitmap handles.  Stored here for effeciency as they are 

     checked every DoDraw() call.

     */

     TBool iBitmap1Valid;

     TBool iBitmap2Valid;

     TBool iTempBitmapValid;

     /**

     Indicates the current frame.  This is the buffer that will be drawn

     on the next call to @see SwapFrame() or when WServ invalidates a sub-portion

     of the screen

     ESubtitleGraphicFrame1: @see iBitmapHandle1

     ESubtitleGraphicFrame2: @see iBitmapHandle2

     ESubtitleGraphicFrame3: @see iTempBitmapHandle

     */

     TSubtitleGraphicFrame iCurrentFrame;

 	/**

 	Indicates the region of the current bitmap that contains new image data

 	*/

 	TRect iDirtyRegion;

 	/**

 	Stores the previous frames dirty region. 

 	*/

 	TRect iOldDirtyRegion;

 	/**

 	The current CRP region stored on the first call to DoDraw()

 	*/

 	mutable TRect iSubtitleRegion;

 	/**

 	Indicates how long the current frame should be displayed for

 	*/

 	TTimeIntervalMicroSeconds iDisplayDuration;

 	/**

 	Indicates the system time that the current frame expires.   Calculated

 	from the current system time and the display duration given on a 

 	ESubtitleGraphicStateDrawFrame/ESubtitleGraphicStateSwapFrame frame message.

 	*/

 	mutable TTime iDisplayClearDue;

 	/**

 	The current CRP state

 	*/

 	mutable TSubtitleGraphicState iState;

 	mutable TBool iCaptureRegion;

 };

 #endif