vtprotocolplugins/DisplaySink/inc/CVtImageScalerImpl.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 26 Jan 2010 12:01:21 +0200
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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 CVTIMAGESCALERIMPL_H
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#define CVTIMAGESCALERIMPL_H
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// INCLUDE FILES
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#include <e32base.h>
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#include <bitmaptransforms.h>
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// FORWARD DECLARATIONS
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class CVtImage;
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// CLASS DECLARATIONS
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/**
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*  Image scaler implementation.
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*
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*  @lib videosource.lib
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*/
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class CVtImageScalerImpl : public CActive
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    {
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    protected:
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        /**
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         * Constructor.
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         */
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        CVtImageScalerImpl();
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    public:
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        /**
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         * Destructor.
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         */
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        ~CVtImageScalerImpl();
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        /**
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        * Sets scaler params.
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        * @param "aParams" Scaling params, including source and target images.
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        * @exception In error situation leaves with one of the system wide
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        * error codes.
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        */
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        void SetSourceTargetL( const CVtImage& aSource, CVtImage& aTarget );
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        /**
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        * Method to check whether bitmap heap locking is needed or not during
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        * scaling process.
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        * @exception In error situation leaves with one of the system wide
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        * error codes.
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        * @return ETrue if bitmap heap lock is needed, EFalse otherwise.
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        */
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        TBool NeedHeapLock() const;
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        /**
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        * Pure virtual scaling method.
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        * @param "aContinue" When method returns, this parameter will contain
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        * ETrue if new call is needed (i.e. scaling is not yet finished) or
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        * EFalse if scaling is complete.
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        * @return KErrNone or one of the system wide error codes.
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        */
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        virtual TInt Scale( TBool& aContinue ) = 0;
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    protected:
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        /**
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         * Scales using CBitmapScaler, which is slow but works with any
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         * Symbian color mode.
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         * @param aQuality Scaling quality @see CBitmapScaler::TQualityAlgorithm
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         * @exception In error situation leaves with one of the system wide
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         * error codes.
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         */
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        void ScaleWithBitmapScalerL(
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            const CBitmapScaler::TQualityAlgorithm aQuality );
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    private:
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        /**
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        * Pure virtual source and target image validation method.
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        * @param "aSource" Constant reference to source image.
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        * @param "aTarget" Constant reference to target image.
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        * @exception If source or target is not valid, this method leaves
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        * with KErrNotSupported.
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        */
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        virtual void ValidateSourceTargetL(
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            const CVtImage& aSource,
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            CVtImage& aTarget ) = 0;
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        /**
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        * Method for validating image size.
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        * @param "aSize" Size to be validated.
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        * @param "aMinSize" Minimum allowed size. If this is not given a default
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        * size of TSize( 1, 1 ) is used.
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        * @exception If size is not valid within given parameters, this
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        * method leaves with KErrNotSupported.
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        */
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        void LeaveIfNotValidSizeL(
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            const TSize& aSize,
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            const TSize aMinSize = TSize( 1, 1 ) );
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    private: // from CActive
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        /**
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         * @see CActive::RunL
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         */
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        void RunL();
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        /**
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         * @see CActive::DoCancel
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         */
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        void DoCancel();
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    protected:
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        // Source for scaling
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        const CVtImage* iSource; // not owned
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        // Target image (will hold scaled source)
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        CVtImage* iTarget; // not owned
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        // Bitmap scaler instance
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        CBitmapScaler* iScaler;
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        // Active scheduler waiter object
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        CActiveSchedulerWait iActiveSchedulerWait;
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    };
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#endif // CVTIMAGESCALERIMPL_H
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// End of File
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