/*

* Copyright (c) 2010 Ixonos Plc.

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the "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:

* Ixonos Plc

*

* Description:  

*

*/

#ifndef __CFILTERICLSOURCE_H__

#define __CFILTERICLSOURCE_H__

#include <e32base.h>

#include "MImageFilter.h"

class CFbsBitmap;

class CImageDecoder;

//  Loader observer

//=============================================================================

class TBlockEntry

{

public:

	inline ~TBlockEntry()

	{

	    delete[] iData;

	}

public:

	TRect       iRect;

	TUint32 *   iData;

};

//  Loader observer

//=============================================================================

class MLoaderObserver

{

public:

    virtual void OperationReady (const TInt aError) = 0;

};

//  CActive derived loader class

//=============================================================================

class CImageLoader : public CActive

{

public:

    CImageLoader (MLoaderObserver * aObserver);

    virtual ~CImageLoader();

    void LoadBitmapL (TDesC & aFileName, CFbsBitmap * iBitmap);

protected:

    virtual void RunL();

    virtual void DoCancel();

private:

    CFbsBitmap *        iBitmap;

    CImageDecoder *     iDecoder;

    MLoaderObserver *   iObserver;

};

//  ICL source filter

//=============================================================================

class CFilterIclSource

	: public CBase

	, public MImageFilter

    , public MLoaderObserver

	{

public:

        IMPORT_C static TInt Create();

		virtual ~CFilterIclSource();

public: // MImageFilter

		virtual TRect Rect();

        virtual TReal Scale();

        virtual TSize ViewPortSize();

	    virtual TBlock * GetBlockL ( const TRect & aRect );

		virtual void SetParent( MImageFilter* aParent );

		virtual void SetChild( MImageFilter* aChild );

		virtual TInt CmdL( const TDesC16& aCmd );

		virtual const char* Type();

public: // MLoaderObserver

        virtual void OperationReady (const TInt aError);

protected:        

private:

		static CFilterIclSource* NewL();

		CFilterIclSource();

		void ConstructL();

        void LoadRectL();

private: // Data

        enum TOutputState

        {

            EDirect,

            EBuffer,

        } iOutputState;

        TRect           iRect;

        TRect           iScaledRect;

        CFbsBitmap *    iBitmap;

        TInt            iWStep;

        CImageLoader *  iLoader;

        //  destination size

        TSize           iDestSize;

        //  destination buffer

        TUint32 *       iDestBuffer;

        //  relative scale

        TReal           iRelScale;

        TBlockEntry **  iBlockBuffer;

        TSize			iSize;

		TSize           iSizeInBlocks;

		TUint32         iLastBlock;

        TInt *          iIndexMap;

        TInt            iOldestBlock;

        TInt            iBlockBufferSize;

        TFileName		iFileName;

};

#endif