mpxmusicplayer/commonui/inc/mpximageutil.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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/*
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* Copyright (c) 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:  Class declaration of CMPXImageUtil.
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*
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*/
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#ifndef CMPXIMAGEUTIL_H
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#define CMPXIMAGEUTIL_H
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//  INCLUDES
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#include "mpxalbumartutilobserver.h"
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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 DECLARATION
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/**
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*  Image Conversion Class.
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**/
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class CMPXImageUtil : public CActive
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    {
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public:
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	// states for this engine
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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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	    EScaling
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	    };
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public:  // Constructors and destructor
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    /**
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    * Two-phased constructor.
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    * @param aObserver ablum art observer
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    * @return A pointer to a newly created object
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    */
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    static CMPXImageUtil* NewL(MMPXAlbumArtUtilObserver& aObserver);
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    /**
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    * Destructor.
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    */
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    ~CMPXImageUtil();
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private:
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    /**
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    * C++ default constructor.
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    */
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    CMPXImageUtil(MMPXAlbumArtUtilObserver& aObserver); 
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    /**
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    * By default Symbian 2nd phase constructor is private.
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    */
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    void ConstructL();  
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public: // New functions
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    /*
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    * Starts to decode an image from a file. 
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    * @param aFileName Full path and filename of the image to be decoded.
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    * @param aSize The size of the required destination BMP.
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    * @param aDisplayMode the display mode of the destination BMP
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    */
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    void StartToDecodeL(const TDesC& aFileName, 
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                        const TSize& aSize, 
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                        TDisplayMode aDisplayMode = EColor64K);
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    /*
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    * Starts to decode an image from JPG buffer
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    * @param aSize The size of the required destination JPG
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    * @param aAlbumArt The pointer to the JPG buffer
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    * @param aDisplayMode the display mode of the destination JPG
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    */
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    void StartToDecodeL(const TSize& aSize, 
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                        HBufC8* aAlbumArt, 
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                        TDisplayMode aDisplayMode = EColor64K);
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    /*
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    * Cancel outstanding asynch requests
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    */
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    void CancelRequest();
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private: // New functions
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    /**
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    * Scales iBitmap to iSize 
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    **/
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    void ScaleL();
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    TSize CalculateDecodeSize(const TSize& aSize);
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private: // Functions from base classes
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    /**
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    * Cancellation of an outstanding request.
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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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    void RunL();
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private:    // Data
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    MMPXAlbumArtUtilObserver&       iObserver;      // Album art util observer
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    CFbsBitmap*                     iBitmap;        // decoded image
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    CImageDecoder*                  iImageDecoder;  // decoder
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    CBitmapScaler*                  iScaler;        // bitmap scaler
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    TSize                           iSize;          // desired size of the bitmap
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    TState                          iState;         // engine state
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    RFs                             iFs;            // for opening/saving images from/to files
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    HBufC8*                         iImageData;     // Album art image data (owned)
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    TBool                           iScaleRquired;
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    };
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#endif // CMPXIMAGEUTIL_H   
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// End of File