idlehomescreen/widgetmanager/inc/wmimageconverter.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 18 Jan 2010 20:10:36 +0200
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/*
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* Copyright (c) 2009 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:
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* CWmImageConverter declaration
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*
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*/
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#ifndef WMIMAGECONVERTER_H
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#define WMIMAGECONVERTER_H
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//includes
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#include <e32std.h>
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#include <e32base.h>
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#include <f32file.h>
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#include <AknIconUtils.h> // MAknIconFileProvider
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// Forward declarations
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class CFbsBitmap;
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class CBitmapScaler;
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class CImageDecoder;
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class TAknsItemID;
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class CWmUnitTest;
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class MSvgError;
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// Class declaration
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/**
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 *  MConverterObserver
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 *  To notify when image is converted
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 */
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NONSHARABLE_CLASS( MConverterObserver )
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    {
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    public:
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        virtual void NotifyCompletion( TInt aError ) = 0;
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    };
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// Class declaration
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/**
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 * CWmImageConverter
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 * Image converter
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 */
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NONSHARABLE_CLASS ( CWmImageConverter ) : public CActive,
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        public MAknIconFileProvider
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    {
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    /** states for this converter */
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    enum TState 
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        {
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        EIdle = 0,
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        EDecoding,
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        EScalingBitmap,
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        EScalingMask,
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        EFailed
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        };
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public: //contructors/destructors
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    /**
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     * Two-phased constructor.
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     * @param aObserver observer
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     */
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    static CWmImageConverter* NewL( MConverterObserver* aObserver );    
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    /** Destructor */
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    ~CWmImageConverter();
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public: // interface methods
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    /**
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     * Parses icon string and prepares logo image.
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     * 
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     * @param aWidth wanted widht
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     * @param aHeight wanted height
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     * @param aIconStr str containing logo icon
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     * Supported values:
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     * - skin(<major id> <minor id>):mif(<path> <bitmapid> <maskid>)
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     * - mif(<path> <bitmapid> <maskid>)
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     * - uid(<application uid>)
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     * - <file name>.<png/svg>
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     * 
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     * @return Error code 
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     */
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    TInt HandleIconString( TInt aWidth, TInt aHeight, const TDesC& aIconStr );
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    /**
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     * Returns converted bitmap. Caller takes ownership
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     * 
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     * @return CFbsBitmap
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     */
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    CFbsBitmap* Bitmap();
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    /**
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     * Returns converted mask. Caller takes ownership
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     * 
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     * @return CFbsBitmap
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     */
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    CFbsBitmap* Mask();
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    /**
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     * sets the size for decoding
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     * @param aSize the logo size
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     */
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    void SetLogoSize( const TSize& aSize );
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    /** supported image conversion methods */
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    enum TConversionMethod
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        {
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        EUnrecognized, // we could not recognise the icon string
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        EUidIcon, // App.UID-coded icon
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        ESvgIcon, // Icon from SVG-file
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        ESkinIcon, // Icon from SKIN id
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        EMifIcon, // Icon from MIF file, known graphic index
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        ESkinAndMifIcon, // Icon from SKIN and MIF combination 
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        EImageIcon, // Icon from image file (jpeg or png)
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        };
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    /**
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     * The type of currently converted image.
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     * This method can be used to check if correct conversion was used.
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     * @return conversion method used for current image
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     */
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    TConversionMethod ConversionMethod();
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2
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    /**
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     * Image convertion status
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     * 
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     * @return ETrue if processing image, false otherwise.
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     */
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    TBool IsProcessing();
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1
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protected: // implementation of CActive
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    /**
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     * Implements cancellation of an outstanding request.
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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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    /**
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     * Handles an active object's request completion event.
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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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     * RunError
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     * 
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     * @see CActive::RunError
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     */
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    TInt RunError(TInt aError);
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private:
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    CWmImageConverter(); 
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    void ConstructL( MConverterObserver* aObserver );
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    void CheckSvgErrorL( MSvgError* aError );
2
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    void HandleIconStringL( TInt aWidth, TInt aHeight, 
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            const TDesC& aIconStr );
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1
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private:
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    void ScaleBitmap( TInt aWidth, TInt aHeight );
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    void ScaleMask( TInt aWidth, TInt aHeight );
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    void CreateIconFromUidL( const TUid& aUid );
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    void CreateIconFromSvgL( const TDesC& aFileName );
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    void CreateIconFromOtherL( const TDesC& aFileName );
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    void CreateSkinOrMifIconL( 
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                    const TAknsItemID& aItemId, TInt aBitmapId, 
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                    TInt aMaskId, const TDesC& aFileName );
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    // resolvers
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    TBool ResolveUid( const TDesC& aPath, TUid& aUid );
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    TBool ResolveSkinId( const TDesC& aPath, TAknsItemID& aItemId );
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    TBool ResolveMifId( const TDesC& aPath, TInt& aBitmapId, 
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                        TInt& aMaskId, TDes& aFileName );
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    TBool ResolveSkinIdAndMifId( const TDesC& aPath, TAknsItemID& aItemId,
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                        TInt& aBitmapId, TInt& aMaskId, TDes& aFileName );
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    TBool EndsWith( const TDesC& aString, const TDesC& aPattern );
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2
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    // helpers
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    TInt ParseNextUint( TLex& aLex, TUint& aValue );
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1
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private: // from MAknIconFileProvider
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    /** Returns an open file handle to the icon file. */
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	void RetrieveIconFileHandleL( RFile& aFile, const TIconFileType aType );
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    /** Stops using this MAknIconFileProvider instance */
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    void Finished();
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private:
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    /**
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     * Converter observer (not owned)
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     */
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    MConverterObserver*     iObserver;
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    /**
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     * decoded image
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     */
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    CFbsBitmap*             iBitmap;
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    /**
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     * decoded image mask
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     */
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    CFbsBitmap*             iMask;
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    /**
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     * decoder from ICL API
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     */
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    CImageDecoder*          iImageDecoder;
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    /**
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     * bitmap scaler
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     */
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    CBitmapScaler*          iScaler;
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    /**
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     * internal state
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     */
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    TState                  iState;
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    /**
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     * File name to convert
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     */
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    TFileName               iFilename;
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    /**
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     * size to convert
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     */
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    TSize                   iSize;
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    /**
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     * is scaling needed
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     */
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    TBool                   iScaleNeeded;
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    /**
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     * File handle
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     */
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    RFs                     iFs;
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    /**
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     * Conversion method for current image
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     */
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    TConversionMethod       iConversionMethod;
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    };
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#endif // #ifndef WMIMAGECONVERTER_H
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// end of file