/*+
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* Copyright (c) 2004 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:  Implementation of bitmap scaler class+
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*              : using Font and Bitmap Server bitmaps.+
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*+
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*/+
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+
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#ifndef CIHLSCALER_H+
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#define CIHLSCALER_H+
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+
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// INCLUDES+
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#include <MIHLScaler.h>+
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#include <e32base.h>+
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#include <gdi.h>+
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+
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// Define this to show throughput measurements+
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//#define RD_MEASURE_THROUGHPUT+
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+
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// FORWARD DECLARATIONS+
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class CFbsBitmap;+
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+
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// CLASS DECLARATION+
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/**+
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*  CIHLScaler+
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*+
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*  Implementation of Scaling processor+
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*  using Font and Bitmap Server bitmaps.+
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*  @lib IHL.lib+
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*  @since 3.0+
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*/+
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NONSHARABLE_CLASS( CIHLScaler ) : public CActive, public MIHLScaler+
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    {+
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    public: // Constructors and destructor+
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+
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        /**+
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        * Two-phased constructor.+
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        */+
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        static CIHLScaler* NewL( const TUint32 aOptions = 0 );+
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+
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        /*+
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        * Virtual destructor.+
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        */+
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        virtual ~CIHLScaler();+
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+
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    public: // From base class MIHLScaler+
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+
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        /*+
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        * From MIHLScaler, see base class header.+
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        */+
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		TInt Scale( TRequestStatus& aStatus,+
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					const CFbsBitmap& aSrcBitmap,+
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					const TRect& aSrcRect,+
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					CFbsBitmap& aDstBitmap,+
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					const TRect& aDstRect );+
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+
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        /*+
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        * From MIHLScaler, see base class header.+
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        */+
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		TBool IsBusy() const;+
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+
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        /*+
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        * From MIHLScaler, see base class header.+
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        */+
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		void CancelProcess();+
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+
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        /*+
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        * From MIHLScaler, see base class header.+
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        */+
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		void SetFilter( MIHFilter* aFilter );+
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+
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	private: // From base class CActive+
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+
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        /*+
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        * From CActive, see base class header.+
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        */+
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		void DoCancel();+
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+
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        /*+
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        * From CActive, see base class header.+
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        */+
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		void RunL();+
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+
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        /*+
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        * From CActive, see base class header.+
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        */+
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		TInt RunError( TInt aError );+
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+
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	public: // Internal interface+
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+
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        /**+
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        * Check if rectangle is inside size.+
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        * @since 3.0+
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		* @return ETrue if rectangle is fully inside given area, EFalse if not.+
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		*/+
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		TBool IsValidRect( const TSize& aSize, const TRect& aRect );+
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+
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	private: // Private methods+
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+
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        /*+
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        * Initialize process parameters and stepper values.+
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        * @return ETrue if only doing scaling (and not rotating)+
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        */+
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		TBool InitStepperValues();+
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		+
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		/*+
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        * Select and initialize fastest possible code path+
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        */+
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        +
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		void InitCodePath(const TSize& aSrcSize, const TDisplayMode &aSrcMode, const TSize& aDstSize, const TDisplayMode &aDstMode, TBool aOnlyScaling);+
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+
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        /*+
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        * Process step using nearest neighbour method.+
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        */+
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		TBool ProcessNearestNeighbour();+
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		TBool ProcessNearestNeighbour64K();           // For 16-bit non-compressed bitmaps+
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		TBool ProcessNearestNeighbour64KScaleOnly();  // For 16-bit non-compressed bitmaps (only scaling)+
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		TBool ProcessNearestNeighbour16MX();          // For 32-bit non-compressed bitmaps+
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		TBool ProcessNearestNeighbour16MXScaleOnly(); // For 32-bit non-compressed bitmaps (only scaling)+
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				+
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        /*+
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        * Process step using bilinear interpolation method.+
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        */+
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		TBool ProcessBilinear();+
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+
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        /*+
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        * Complete dummy request. This causes RunL() method to be called.+
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        * Needed by state machine.+
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        */+
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		void SelfComplete();+
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+
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        /*+
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        * Complete client process request.+
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        * This causes client RunL() method to be called.+
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        */+
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		void RequestComplete( TInt aReason );+
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+
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	private: // Private constructors+
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+
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        CIHLScaler( const TUint32 aOptions );+
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+
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    private: // Data+
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+
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		// Ref: Process status+
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		TRequestStatus* iScalerStatus;+
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        TBool iNeedProcess;+
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+
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		// Process options+
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		const TUint32 iOptions;+
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+
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        // Ref: Source bitmap+
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		const CFbsBitmap* iSrcBitmap;+
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		TRect iSrcRect;+
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+
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		// Ref: Destination bitmaps+
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		CFbsBitmap* iDstBitmap;+
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		TRect iDstRect;+
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+
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		// Process position and stepping+
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		TPoint iSrcIncrementInner;+
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		TPoint iSrcIncrementOuter;+
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		TPoint iSrcPos;+
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+
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		TInt iDstIncrementInner;+
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		TInt iDstIncrementOuter;+
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		TPoint iDstPos;+
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+
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		TInt iProcessInner;+
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		TInt iProcessOuter;+
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		TSize iProcessSize;+
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		+
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		// For fast code path+
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		TInt iSrcPitchInPixels;+
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		TInt iDstPitchInPixels;+
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		TUint32 iScanlinesLeft;+
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		TUint32 iScanlinesPerRound;+
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		TInt iDstStartOffset;+
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		TInt iDstResidualPixels;+
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		+
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		// Only for measuring scaler throughput+
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#ifdef RD_MEASURE_THROUGHPUT+
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		TUint32 iStartTime;+
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#endif+
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		+
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		/*+
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        * Forward process step event to selected processing code path+
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        * Called by RunL() method.+
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        */+
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		TBool (CIHLScaler::*ProcessingFunc)();+
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    };+
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+
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#endif // CIHLSCALER_H+
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+
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// End of File+
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