/*
* Copyright (c) 2004 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:    Image Transforms subsystem.
*
*/




#ifndef CVTIMAGESCALERIMPLNEAREST_H
#define CVTIMAGESCALERIMPLNEAREST_H

// INCLUDE FILES

#include "CVtImageScalerImpl.h"

// CLASS DECLARATIONS

/**
*  Nearest neigbour image scaling implementation.
*
*  @lib videosource.lib
*/
class CVtImageScalerImplNearest : public CVtImageScalerImpl
    {
    private: // from CVtImageScalerImpl

        /**
        * From CVtImageScalerImpl. Check CVtImageScalerImpl for description.
        */
        TInt Scale( TBool& aContinue );

    private:

        /**
        * Validate given parameters.
        */
        void ValidateSourceTargetL(
            const CVtImage& aSource,
            CVtImage& aTarget );

        /**
        * Initializes internal variables for scaling.
        */
        void Initialize();

        /**
        * Scales images in displaymode EColor4K.
        */
        void Scale4K(
            const TUint16* aSrcPtr,
            TUint32 aSrcPitch,
            TUint16* aTrgPtr,
            TUint32 aTrgWidth,
            TUint32 aTrgHeight,
            TUint32 aDx,
            TUint32 aDy );

        /**
        * Scales images in displaymode EColor64K.
        */
        void Scale64K(
            const TUint16* aSrcPtr,
            TUint32 aSrcPitch,
            TUint16* aTrgPtr,
            TUint32 aTrgWidth,
            TUint32 aTrgHeight,
            TUint32 aDx,
            TUint32 aDy );

        /**
        * Scales images in displaymode EColor16M.
        */
        void Scale16M(
            const TUint8* aSrcPtr,
            TUint32 aSrcPitch,
            TUint8* aTrgPtr,
            TUint32 aTrgWidth,
            TUint32 aTrgHeight,
            TUint32 aTrgPitch,
            TUint32 aDx,
            TUint32 aDy );

        /**
        * Scales images in displaymodes EColor16MU and EColor16MA.
        */
        void Scale16MU16MA(
            const TUint32* aSrcPtr,
            TUint32 aSrcPitch,
            TUint32* aTrgPtr,
            TUint32 aTrgWidth,
            TUint32 aTrgHeight,
            TUint32 aDx,
            TUint32 aDy );

        /**
        * Fast scaling when target is double the source size for
        * 4K and 64K display modes.
        */
        void Scale2x4K64K();

        /**
        * Fast scaling when target is double the source size for 16M
        * display mode.
        */
        void Scale2x16M();

        /**
        * Fast scaling when target is double the source size for 16MU and 16MA
        * display modes.
        */
        void Scale2x16MU16MA();

    private:

        // Target width ratio to source width
        TUint32 iU;

        // Target height ratio to source height
        TUint32 iV;
    };

#endif // CVTIMAGESCALERIMPLNEAREST_H

// End of File