uiservicetab/vimpstdetailsviewplugin/inc/cvimpstdetailsimagedecoder.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 19 Feb 2010 22:41:11 +0200
branchRCL_3
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/*
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* Copyright (c) 2008 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:  Utility class for asynchronously decoding the header thumbnail image
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 *
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*/
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#ifndef CVIMPSTDETAILSIMAGEDECODER_H_
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#define CVIMPSTDETAILSIMAGEDECODER_H_
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#include <e32base.h>
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#include <f32file.h>
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class CVIMPSTDetailsHeaderControl;
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class CImageDecoder;
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class CFbsBitmap;
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class CBitmapScaler;
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/**
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 * Utility class for asynchronously decoding the header thumbnail image
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 *
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 *  @lib vimpstdetailsviewplugin.dll
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 *  @since S60 v5.0
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 */
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class CVIMPSTDetailsImageDecoder : public CActive
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    {
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public:
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    /**
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     * Two-phased constructor
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     * 
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     * @param aHeader The header control to which the bitmap is to be inserted after loading
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     * @param aBitmapData Descriptor containing the bitmap data stream
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     * @return a instance of same class
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     * @since S60 v5.0 
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     */
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    static CVIMPSTDetailsImageDecoder* NewL(CVIMPSTDetailsHeaderControl& aHeader, const TDesC8& aBitmapData);
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    /**
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     * Destructor
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	 * @since S60 v5.0 
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     */
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    ~CVIMPSTDetailsImageDecoder();
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    /**
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     * Starts the decoding process
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     * @since S60 v5.0 
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     *
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     */
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    void StartL(TSize aBitmapSize);
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    /**
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     * From CActive
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     * (see details from baseclass )
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     * @since S60 v5.0 
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     */
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    void RunL();
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    /**
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     * From CActive
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     * (see details from baseclass )
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     * @since S60 v5.0 
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     */
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    void DoCancel();
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private:
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    /**
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     * First-phase (C++) constructor
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     * @param aHeader The header control to which the bitmap is to be inserted after loading
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     * @since S60 v5.0  
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     */
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    CVIMPSTDetailsImageDecoder(CVIMPSTDetailsHeaderControl& aHeader);
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    /**
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     * Second phase constructor
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     * @since S60 v5.0 
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     * @param aBitmapData Descriptor containing the bitmap data stream
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     */
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    void ConstructL(const TDesC8& aBitmapData);
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    /**
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     * Scales bitmap
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     *
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     */
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    void ScaleBitmapL();
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    enum TCcaImageDecoderState
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        {
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        ECcaConvertThumbnailImage = 1,
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        ECcaScaleThumbnail,       
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        };
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    /**
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     * Create bitmap
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     *
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     */
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    void CreateBitmapL();
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 private : // data  
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    /**
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     * Not Owns : The header control to which the bitmap is to be inserted after loading
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     */
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    CVIMPSTDetailsHeaderControl& iHeader;
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    /**
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     * Owns : The image decoder whose service is called to decode the image
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     */
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    CImageDecoder* iImgDecoder;
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    /**
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     * Owns : Handle to the file server session for loading the bitmap
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     */ 
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    RFs iFs;
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    /**
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     * The bitmap.
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     * Owned until decoding is complete, then ownersip is transferred to header control.
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     */
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    CFbsBitmap* iBitmap; // owned until completion
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    /**
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     * Owns : Copy of the bitmap data stream
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     */
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    HBufC8* iBitmapData;
4
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    /**
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     * The image scaler whose service is called to scale the image
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     * Own.
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     */
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    CBitmapScaler* iBitmapScaler;
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    TSize iBitmapSize;
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    /** 
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     * Decoder internal state
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     */ 
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    TInt iDecoderState;
0
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    };
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#endif /*CVIMPSTDETAILSIMAGEDECODER_H_*/