/*

* Copyright (c) 2010 ISB.

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the "Symbian Foundation License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.symbianfoundation.org/legal/sfl-v10.html".

*

* Initial Contributors:

* ISB - Initial contribution

*

* Contributors:

*

* Description:

*

*/

#ifndef ECAMWEBCAMERAVFACTIVE_H

#define ECAMWEBCAMERAVFACTIVE_H

#include "ecamwebcameraplugin.h"

const TInt KVfWidth     = 640;			// viewfinder image width

const TInt KVfHeight    = 480;			// viewfinder image height

const TInt KVfLineBytes = KVfWidth * 3;	// bytes of one line

/**

 *  Perform a viewfinder function.

 */

class CWebCameraVfActive : public CActive

						 , public MDirectScreenAccess

	{

public:

	 /**

     * Two-phased constructor.

     * @param aOwner pointer to callback object.

     * @param aDriver reference to driver.

     */

	static CWebCameraVfActive* NewL(MWebCameraVfActiveCallBack* aOwner, RWebcameraDevice& aDriver);

	CWebCameraVfActive(MWebCameraVfActiveCallBack* aOwner, RWebcameraDevice& aDriver);

	/**

	Destructor

	*/

	~CWebCameraVfActive();

	/** 

	Init ViewFinder.

	*/

	TInt InitViewFinder();

	/** 

	Starts transfer of view finder data to the given portion of the screen using

	direct screen access.

	The aScreenRect parameter is in screen co-ordinates and may be modified if,

	eg, the camera requires the destination to have a certain byte alignment, etc.

    @param  aWs 

	        Window server session.

	@param  aScreenDevice 

	        Screen device.

	@param  aWindow 

	        Displayable window.

	@param  aScreenRect 

	        Portion of the screen to which view finder data is to be

	        transferred. This is in screen co-ordinates and may be modified if, for example,

	        the camera requires the destination to have a certain byte alignment.

	*/

	void StartViewFinderDirectL(RWsSession& aWs, CWsScreenDevice& aScreenDevice, RWindowBase& aWindow, TRect& aScreenRect, TRect& aClipRect, TUint8* aChunkBase, TInt& aChunkSize);

	/** 

	Stops transfer of view finder data to the screen. 

	*/

	void StopViewFinder();

	/** 

	Queries whether the view finder is active.

	@return  ETrue if the view finder is active. EFalse if the view finder is not

	         active. 

	*/

	TBool ViewFinderActive();

private:

	/** 

	from MAbortDirectScreenAccess

	This function is called by the window server when direct screen access must stop

	(for example because a dialogue is moved in front of the area where direct screen access is taking place).

	@param  aScreenDevice 

			The reason why direct screen access was terminated. 

	*/

	virtual void AbortNow(RDirectScreenAccess::TTerminationReasons aReason);

private: 

	/** 

	from 	from MDirectScreenAccess

	This function is called by the window server as soon as direct screen access can resume.

	@param  aScreenDevice 

			Provides the reason why direct screen access was terminated. 

	*/

	virtual void Restart(RDirectScreenAccess::TTerminationReasons aReason);

private:

	void ConstructL();

	/** 

	Start viewfinder process.

	*/

	void Start();

	/** 

	Draw the image of the view finder on screen.

	*/

	void UpdateViewL();

	/** 

	bitmap data set for CFbsBitmap.

	*/

	TInt BitmapDataSet(TDes8& aBitmap, CFbsBitmap& aVfBitmap);

private:

	void RunL();

	void DoCancel();

private:

	MWebCameraVfActiveCallBack*		iOwner;				///< origin of start.

	TBool							iViewFinderActive;	///< Status of viewfinder

	RWebcameraDevice				iDriver;			///< Camera driver

	CFbsBitmap*						iVfBitmap;			///< Bitmap data of viewfinder.

	HBufC8*							iVfBuf;				///< Data buffer of viewfinder.

	TPtr8							iVfBufPtr;			///< Pointer to data buffer of viewfinder.

	CDirectScreenAccess*			iDSA;				///< DirectScreenAccess object.

	TRect							iScreenRect;		///< The region to draw.

	TRect							iClipRect;			///< The clipping region to draw.

	TBool							iTestFlug;			///< for test

	TUint8*							iChuckBase;			///< 	

	TInt							iChuckRemSize;		///< 

	};

#endif // ECAMWEBCAMERAPLUGIN_H