camerauis/cameraapp/generic/inc/CamBurstThumbnailGridSizer.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 07 Jan 2010 16:18:56 +0200
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/*
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* Copyright (c) 2007 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 used to for resizing burst mode thumbnails*
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*/
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#ifndef CAMBURSTTHUMBNAILGRIDSIZER_H
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#define CAMBURSTTHUMBNAILGRIDSIZER_H
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//  INCLUDES
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#include <bitmaptransforms.h>   // For CBitmapScaler
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// CONSTANTS
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// MACROS
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// DATA TYPES
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// FUNCTION PROTOTYPES
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// FORWARD DECLARATIONS
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// Helper class
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class CScaleTask : public CBase
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  {   
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  // =======================================================
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  public:
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    static CScaleTask* NewL( const CFbsBitmap& aBitmap, 
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                             const TSize&      aSize,
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                             TInt32            aInfo );
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    virtual ~CScaleTask();
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  private:
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    CScaleTask( const TSize&      aSize,
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                TInt32            aInfo    );
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    void ConstructL( const CFbsBitmap& aBitmap );
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  // -------------------------------------------------------  
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  public:
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    inline const CFbsBitmap* Bitmap() const { return iSrc;  };
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    inline const TSize&      Size()   const { return iSize; };
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    inline TInt32            Info()   const { return iInfo; };
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  // =======================================================
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  private:
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    CFbsBitmap* iSrc; //< owned
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    TSize       iSize;
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    TInt32      iInfo;
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  // =======================================================
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  };    
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// Interface definition for notification of when an image has been resized.
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class MBitmapScaler
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    {
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public: 
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    /**
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    * Mixin interface to be implemented by any object wishing to receive 
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    * notification of scale complete events.
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    * @since 2.8
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    * @param aErr KErrNone if successful, on error other Epoc codes possible
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    * @param aBitmap The resized bitmap (called class takes ownership)
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    * @param aInfo Optional parameter that will be passed back when scale completes
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    */
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    virtual void BitmapScaleCompleteL( TInt aErr, CFbsBitmap* aBitmap, TInt32 aInfo ) = 0 ;
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    };
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/**
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*  Utility class used by the Thumbnail Grid Model for resizing/scaling bitmaps
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*
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*  @since 2.8
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*/
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class CCamThumbnailGridSizer : public CActive
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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 The object to be notified of scaling completion
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        * @param aSize The default size of the bitmap to scale TO
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        * @return An instance of the sizer object
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        */
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        static CCamThumbnailGridSizer* NewL( MBitmapScaler* aObserver, TSize& aSize );
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        /**
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        * Destructor.
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        */
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        virtual ~CCamThumbnailGridSizer();
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    public: // New functions
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    	/**
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    	 * Sets new size for the scaling
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    	 * @param aThumbSize The new size
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    	 */
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    	void SetSize( const TSize aThumbSize );
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    	/**
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        * Scales from a source bitmap to a target bitmap, using the dimentions
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        * of the target bitmap to define the scale
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        * @since 2.8
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        * @param aSrc Source bitmap, scaling from        
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        */
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        void StartScaleL( const CFbsBitmap& aSrc );
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        /**
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        * Scales from a source bitmap to a target bitmap, using the dimensions
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        * of the target bitmap to define the scale
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        * @since 2.8
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        * @param aSrc Source bitmap, scaling from        
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        * @param aSize The size of the bitmap to scale to
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        * @param aInfo Optional parameter that will be passed back when scale completes
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        */
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        void StartScaleL( const CFbsBitmap& aSrc, TSize& aSize, TInt32 aInfo );
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    public: // Functions from base classes
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    protected:  // New functions
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    protected:  // Functions from base classes
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        /**
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        * From CActive
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        */
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       	void DoCancel();
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        /**
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        * From CActive
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        */
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        void RunL();    
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    private:
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        /**
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        * C++ default constructor.
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        * @param aObserver The object to be notified of scaling completion
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        * @param aSize The default size of the bitmap to scale TO
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        */
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        CCamThumbnailGridSizer( MBitmapScaler* aObserver, TSize& aSize );
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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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        /**
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        * Allows specifying of specific sizing task to start
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        * @param aTask The task to begin
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        * @since 3.0
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        */
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        void StartScaleL( CScaleTask* aTask );
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    private:    // Data
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        // Bitmap scaling object, actually does the scaling
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        CBitmapScaler* iScaler;        
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        // The object to be notified when scaling is complete.
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        MBitmapScaler* iObserver;    
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        // Temporary bitmap used while performing the scaling operation
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        CFbsBitmap* iTmpBitmap; 
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        // The size of the bitmap to scale to
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        TSize iThumbSize;                
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        // List of outstanding scaling tasks
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        RPointerArray <CScaleTask> iScaleTaskArray;        
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    };
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#endif      // CAMBURSTTHUMBNAILGRIDSIZER_H
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// End of File