vtengines/videoteleng/Inc/Media/MVtEngImageScaler.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 23 Nov 2009 14:47:47 +0200
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/*
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* Copyright (c) 2004-2006 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:  Interface used for scaling images to certain size.
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*
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*/
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#ifndef VTENGIMAGESCALER_H
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#define VTENGIMAGESCALER_H
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//  INCLUDES
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#include <gdi.h>
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// FORWARD DECLARATIONS
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class CFbsBitmap;
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/**
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* Image scaler observer.
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*
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*  @lib videoteleng.lib
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*  @since Series 60 2.8
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*/
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class MVtEngScalerObserver
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    {
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    public:
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        /**
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        * Called when scaling is ready.
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        * @param aBitmap a scaled bitmap
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        * @param aError Symbian OS error code
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        */
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        virtual void ScalingCompleted( 
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            CFbsBitmap* aBitmap,
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            TInt aError ) = 0;
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    };
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/**
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* Image scaler.
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*
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*  @lib videoteleng
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*  @since 2.6
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*/
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class MVtEngImageScaler
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    {
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    public: // new functions
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        /**
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        * Used to start the scaling of an image.
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        * @param aSourceIndex the index of the source to use.
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        */
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        virtual void ScaleL( 
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            TInt aSourceIndex ) = 0;
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        /**
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        * Configures the scaler.
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        * @param aDisplayMode which kind of display
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        * @param aSize the width and height of the display
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        * @return ETrue if previous scaling was cancelled
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        */
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        virtual TBool ConfigureL(
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            TDisplayMode aDisplayMode,
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            TSize aSize,
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            TInt aSourceHandle1,
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            TInt aSourceHandle2 ) = 0;
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        /**
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        * Deletes the scaling object.
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        */
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        virtual void Release() = 0;
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        /**
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        * Possibility to cancel the scaling.
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        * @return error code of canceling.
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        */
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        virtual TInt Cancel() = 0;
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    };
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/**
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* Image scaler factory.
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*
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*  @lib videoteleng.lib
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*  @since Series 60 2.8
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*/
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class VtEngScalerFactory
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    {
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    public:
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        /**
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        * Factory method for creating scaler
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        * @param aObserver a callback interface
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        */
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        static MVtEngImageScaler* CreateScalerL(
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            MVtEngScalerObserver& aObserver );
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    };
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#endif  // VTENGIMAGESCALER_H
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// End of File