engine/src/ImageHandler.cpp
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Thu, 25 Feb 2010 14:29:19 +0000
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/*
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* Copyright (c) 2007-2010 Sebastian Brannstrom, Lars Persson, EmbedDev AB
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*
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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 the License "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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* EmbedDev AB - initial contribution.
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*
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* Contributors:
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* Example code from OcrExample Copyright (c) 2006 Nokia Corporation.
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* Description:
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*
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*/
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#include "ImageHandler.h"
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// =============================================================================
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// CImageHandler, a utility class for loading images.
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// =============================================================================
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// ============================= MEMBER FUNCTIONS ===============================
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// -----------------------------------------------------------------------------
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// CImageHandler::CImageHandler
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// C++ constructor can NOT contain any code, that
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// might leave.
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// -----------------------------------------------------------------------------
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//
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CImageHandler::CImageHandler( RFs& aFs )
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    : CActive(CActive::EPriorityStandard)
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    , iDecoder(NULL)
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    , iScaler(NULL)
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    , iFs(aFs)
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    , iSize(0,0)
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    {
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    }
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// -----------------------------------------------------------------------------
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// CImageHandler::ConstructL
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// Symbian 2nd phase constructor can leave.
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// -----------------------------------------------------------------------------
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//
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void CImageHandler::ConstructL()
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    {
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    CActiveScheduler::Add(this);
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    iBitmap = new (ELeave) CFbsBitmap;
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    }
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// -----------------------------------------------------------------------------
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// CImageHandler::NewLC
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// Two-phased constructor.
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// -----------------------------------------------------------------------------
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//
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EXPORT_C CImageHandler* CImageHandler::NewL(RFs& aFs)
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    {
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    CImageHandler* self = NewLC(aFs);
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    CleanupStack::Pop();
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    return self;
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    }
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// -----------------------------------------------------------------------------
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// CImageHandler::NewLC
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// Two-phased constructor.
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// -----------------------------------------------------------------------------
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//
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EXPORT_C CImageHandler* CImageHandler::NewLC(RFs& aFs)
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    {
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    CImageHandler* self = new (ELeave) CImageHandler(aFs);
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    CleanupStack::PushL( self );
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    self->ConstructL();
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    return self;
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    }
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// Destructor
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EXPORT_C CImageHandler::~CImageHandler()
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    {
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	// Cancel any outstanding request
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	Cancel();
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	Deque();
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    delete iDecoder;
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    delete iScaler;
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	delete iBitmap;
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    iCallbackQue.Close(); 
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    }
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// -----------------------------------------------------------------------------
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// CImageHandler::LoadFileL
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// Loads a selected frame from a named file
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// -----------------------------------------------------------------------------
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//
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void CImageHandler::LoadFileL(const TFileName& aFileName, TInt aSelectedFrame)
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    {
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    __ASSERT_ALWAYS(!IsActive(),User::Invariant());
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    if ( iDecoder )
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        {
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        delete iDecoder;
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        iDecoder = NULL;
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        }
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    iDecoder = CImageDecoder::FileNewL(iFs, aFileName);
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    // Get image information
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    iFrameInfo = iDecoder->FrameInfo(aSelectedFrame);
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    // Resize to fit.
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    TRect bitmap = iFrameInfo.iFrameCoordsInPixels;
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    // release possible previous image
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    iBitmap->Reset();
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    iBitmap->Create(bitmap.Size(), EColor16M);
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    // Decode as bitmap.
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    iDecoder->Convert(&iStatus, *iBitmap, aSelectedFrame);
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    SetActive();
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    }
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EXPORT_C void CImageHandler::LoadFileAndScaleL(CFbsBitmap* aScaledBitmap, 
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								      const TFileName& aFileName,
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                                      const TSize &aSize,
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                                      MImageHandlerCallback& aCallback,
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                                      TInt aSelectedFrame)
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    {        
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    if(!IsActive())
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    	{
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    	__ASSERT_ALWAYS(!IsActive(),User::Invariant());
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    	iSize = aSize;
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    	iScaledBitmap = aScaledBitmap;
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    	iScaledBitmap->Reset();
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    	iScaledBitmap->Create(aSize, EColor16M);
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    	iCallback = &aCallback; 
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    	LoadFileL(aFileName, aSelectedFrame);
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    	}
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    else
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    	{
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    	TImageStruct imageStruct;
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    	imageStruct.iCallBack = &aCallback;
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    	imageStruct.iScaledImage = aScaledBitmap;
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    	imageStruct.iScaledSize = aSize;    
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    	imageStruct.iFileName = aFileName;
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    	iCallbackQue.Append(imageStruct);
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    	}
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    }
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EXPORT_C CFbsBitmap* CImageHandler::ScaledBitmap()
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	{
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	return iScaledBitmap;
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	}
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void CImageHandler::ScaleL()
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    {
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    __ASSERT_ALWAYS(!IsActive(),User::Invariant());
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    if ( iScaler )
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        {
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        delete iScaler;
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        }
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    iScaler = NULL;
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    iScaler = CBitmapScaler::NewL();
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    iScaler->Scale(&iStatus, *iBitmap, *iScaledBitmap, ETrue);
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    SetActive();
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    }
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// -----------------------------------------------------------------------------
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// CImageHandler::FrameInfo
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// Get the current frame information.
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// -----------------------------------------------------------------------------
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//
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const TFrameInfo& CImageHandler::FrameInfo() const
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    {
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    return iFrameInfo;
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    }
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// -----------------------------------------------------------------------------
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// CImageHandler::RunL
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// CActive::RunL() implementation. Called on image load success/failure.
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// -----------------------------------------------------------------------------
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//
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void CImageHandler::RunL()
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    {
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    if ((! iStatus.Int()) && (iSize.iWidth != 0) && (iSize.iHeight != 0))
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        {
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        ScaleL();
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        iSize.SetSize(0,0);
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        }
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    else
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        {
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        // Invoke callback.
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        iCallback->ImageOperationCompleteL(iStatus.Int());        
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        if(iCallbackQue.Count())
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        	{
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        	TInt loaderror = KErrNotFound;
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        	while(loaderror != KErrNone && iCallbackQue.Count())
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        		{
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        		TImageStruct imageStruct= iCallbackQue[0];
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        		iCallbackQue.Remove(0);
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        		TRAP(loaderror, LoadFileAndScaleL(imageStruct.iScaledImage, imageStruct.iFileName, imageStruct.iScaledSize, *imageStruct.iCallBack));
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        		}
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        	}
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        }
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    }
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// -----------------------------------------------------------------------------
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// CImageHandler::DoCancel
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// CActive::Cancel() implementation. Stops decoding.
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// -----------------------------------------------------------------------------
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//
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void CImageHandler::DoCancel()
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    {
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    if ( iDecoder )
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        {
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        iDecoder->Cancel();
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        }
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    if ( iScaler )
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        {
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        iScaler->Cancel();
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        }
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    }
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