vtprotocolplugins/DisplaySink/inc/CVtImageScalerImplWeightedAverage.h
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/*
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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:    Image Transforms subsystem.
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*
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*/
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#ifndef CVTIMAGESCALERIMPLWEIGHTEDAVERAGE_H
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#define CVTIMAGESCALERIMPLWEIGHTEDAVERAGE_H
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// INCLUDE FILES
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#include "CVtImageScalerImpl.h"
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// CLASS DECLARATIONS
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/**
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*  Weighted average scaler implementation.
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*
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*  @lib videosource.lib
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*/
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class CVtImageScalerImplWeightedAverage : public CVtImageScalerImpl
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    {
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    private: // from CVtImageScalerImpl
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        /**
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        * From CVtImageScalerImpl. Check CVtImageScalerImpl for description.
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        */
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        TInt Scale( TBool& aContinue );
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    private: // methods
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        /**
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        * Validate given parameters.
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        */
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        void ValidateSourceTargetL(
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            const CVtImage& aSource,
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            CVtImage& aTarget );
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        /**
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        * Initializes internal variables for scaling.
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        */
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        void Initialize();
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        /**
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        * Scales images in displaymode EColor4K.
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        */
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        void Scale4K();
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        /**
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        * Scales images in displaymode EColor64K.
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        */
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        void Scale64K();
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        /**
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        * Scales images in displaymode EColor16M.
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        */
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        void Scale16M();
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        /**
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        * Scales images in displaymode EColor16MU.
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        */
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        void Scale16MU();
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        /**
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        * Scales images in displaymode EColor16MA.
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        */
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        void Scale16MA();
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        /**
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        * Fast scaling when target is double the source size for
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        * 4K and 64K display modes.
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        */
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        void Scale2x4K64K( TUint32 aMask );
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        /**
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        * Fast scaling when target is double the source size for
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        * 16M display mode.
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        */
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        void Scale2x16M();
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        /**
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        * Fast scaling when target is double the source size for
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        * 16MU and 16MA display modes.
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        */
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        void Scale2x16MU16MA();
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    private: // data
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        // Target width ratio to source width
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        TUint32 iU;
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        // Target height ratio to source height
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        TUint32 iV;
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    };
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#endif // CVTIMAGESCALERIMPLWEIGHTEDAVERAGE_H
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// End of File
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