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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;
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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;
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};
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#endif /*CVIMPSTDETAILSIMAGEDECODER_H_*/
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