/*
* Copyright (c) 2007-2010 Sebastian Brannstrom, Lars Persson, EmbedDev AB
*
* All rights reserved.
* This component and the accompanying materials are made available
* under the terms of the License "Eclipse Public License v1.0"
* which accompanies this distribution, and is available
* at the URL "http://www.eclipse.org/legal/epl-v10.html".
*
* Initial Contributors:
* EmbedDev AB - initial contribution.
*
* Contributors:
* Example code from OcrExample Copyright (c) 2006 Nokia Corporation.
* Description:
*
*/

#include "ImageHandler.h"
#include "debug.h"

// =============================================================================
// CImageHandler, a utility class for loading images.
// =============================================================================

// ============================= MEMBER FUNCTIONS ===============================

// -----------------------------------------------------------------------------
// CImageHandler::CImageHandler
// C++ constructor can NOT contain any code, that
// might leave.
// -----------------------------------------------------------------------------
//
CImageHandler::CImageHandler( RFs& aFs )
    : CActive(CActive::EPriorityStandard)
    , iDecoder(NULL)
    , iScaler(NULL)
    , iFs(aFs)
    , iSize(0,0)
    {
    }

// -----------------------------------------------------------------------------
// CImageHandler::ConstructL
// Symbian 2nd phase constructor can leave.
// -----------------------------------------------------------------------------
//
void CImageHandler::ConstructL()
    {
    CActiveScheduler::Add(this);
    iBitmap = new (ELeave) CFbsBitmap;
    }

// -----------------------------------------------------------------------------
// CImageHandler::NewLC
// Two-phased constructor.
// -----------------------------------------------------------------------------
//
EXPORT_C CImageHandler* CImageHandler::NewL(RFs& aFs)
    {
    CImageHandler* self = NewLC(aFs);
    CleanupStack::Pop();
    return self;
    }

// -----------------------------------------------------------------------------
// CImageHandler::NewLC
// Two-phased constructor.
// -----------------------------------------------------------------------------
//
EXPORT_C CImageHandler* CImageHandler::NewLC(RFs& aFs)
    {
    CImageHandler* self = new (ELeave) CImageHandler(aFs);
    CleanupStack::PushL( self );
    self->ConstructL();

    return self;
    }

// Destructor
EXPORT_C CImageHandler::~CImageHandler()
    {
	// Cancel any outstanding request
	Cancel();
	Deque();
    delete iDecoder;
    delete iScaler;
	delete iBitmap;
    iCallbackQue.Close(); 
    }

// -----------------------------------------------------------------------------
// CImageHandler::LoadFileL
// Loads a selected frame from a named file
// -----------------------------------------------------------------------------
//
void CImageHandler::LoadFileL(const TFileName& aFileName, TInt aSelectedFrame)
    {
    __ASSERT_ALWAYS(!IsActive(),User::Invariant());
    if ( iDecoder )
        {
        delete iDecoder;
        iDecoder = NULL;
        }
   
    iDecoder = CImageDecoder::FileNewL(iFs, aFileName);
    // Get image information
    iFrameInfo = iDecoder->FrameInfo(aSelectedFrame);
    // Resize to fit.
    TRect bitmap = iFrameInfo.iFrameCoordsInPixels;

    // release possible previous image
    iBitmap->Reset();
    iBitmap->Create(bitmap.Size(), EColor16M);

    // Decode as bitmap.
    iDecoder->Convert(&iStatus, *iBitmap, aSelectedFrame);
    SetActive();
    }

EXPORT_C void CImageHandler::LoadFileAndScaleL(CFbsBitmap* aScaledBitmap, 
								      const TFileName& aFileName,
                                      const TSize &aSize,
                                      MImageHandlerCallback& aCallback,
                                      TUint aHandle,
                                      TInt aSelectedFrame)
    {
    DP1("CImageHandler::LoadFileAndScaleL, iCallbackQueue.Count()=%d", iCallbackQue.Count());

    if(!IsActive())
    	{
    	__ASSERT_ALWAYS(!IsActive(),User::Invariant());
    	iSize = aSize;
    	iScaledBitmap = aScaledBitmap;
    	iScaledBitmap->Reset();
    	iScaledBitmap->Create(aSize, EColor16M);
    	iCallback = &aCallback;
    	iHandle = aHandle;
    	LoadFileL(aFileName, aSelectedFrame);
    	}
    else
    	{
    	for (int i=0;i<iCallbackQue.Count();i++)
    		{
    		if (iCallbackQue[i].iFileName.Compare(aFileName) == 0)
    			{
				User::Leave(KErrAlreadyExists);
    			}
    		}
    	
    	TImageStruct imageStruct;
    	imageStruct.iCallBack = &aCallback;
    	imageStruct.iScaledImage = aScaledBitmap;
    	imageStruct.iScaledSize = aSize;    
    	imageStruct.iFileName = aFileName;
    	imageStruct.iHandle = aHandle;
    	iCallbackQue.Append(imageStruct);
    	}
    }

EXPORT_C CFbsBitmap* CImageHandler::ScaledBitmap()
	{
	return iScaledBitmap;
	}

void CImageHandler::ScaleL()
    {
    __ASSERT_ALWAYS(!IsActive(),User::Invariant());
    if ( iScaler )
        {
        delete iScaler;
        }
    iScaler = NULL;
    iScaler = CBitmapScaler::NewL();
    iScaler->Scale(&iStatus, *iBitmap, *iScaledBitmap, ETrue);
    SetActive();
    }

// -----------------------------------------------------------------------------
// CImageHandler::FrameInfo
// Get the current frame information.
// -----------------------------------------------------------------------------
//
const TFrameInfo& CImageHandler::FrameInfo() const
    {
    return iFrameInfo;
    }

// -----------------------------------------------------------------------------
// CImageHandler::RunL
// CActive::RunL() implementation. Called on image load success/failure.
// -----------------------------------------------------------------------------
//
void CImageHandler::RunL()
    {
    DP1("CImageHandler::RunL(), iCallbackQueue.Count()=%d", iCallbackQue.Count());
    if ((! iStatus.Int()) && (iSize.iWidth != 0) && (iSize.iHeight != 0))
        {
        ScaleL();
        iSize.SetSize(0,0);
        }
    else
        {
        // Invoke callback.
        iCallback->ImageOperationCompleteL(iStatus.Int(), iHandle);        
        if(iCallbackQue.Count())
        	{
        	TInt loaderror = KErrNotFound;
        	while(loaderror != KErrNone && iCallbackQue.Count())
        		{
        		TImageStruct imageStruct= iCallbackQue[0];
        		iCallbackQue.Remove(0);
        		TRAP(loaderror, LoadFileAndScaleL(imageStruct.iScaledImage, imageStruct.iFileName, imageStruct.iScaledSize, *imageStruct.iCallBack, imageStruct.iHandle));
        		}
        	}
        }
 
    }

// -----------------------------------------------------------------------------
// CImageHandler::DoCancel
// CActive::Cancel() implementation. Stops decoding.
// -----------------------------------------------------------------------------
//
void CImageHandler::DoCancel()
    {
    if ( iDecoder )
        {
        iDecoder->Cancel();
        }
    if ( iScaler )
        {
        iScaler->Cancel();
        }
    }