// Copyright (c) 1999-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "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:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

//

#include <fbs.h>

#include "WBMPCodec.h"

// CWbmpReadCodec

CWbmpReadCodec::CWbmpReadCodec(const TSize& aWbmpSize):

	iOriginalSize(aWbmpSize)

	{}

CWbmpReadCodec::~CWbmpReadCodec()

	{

	}

CWbmpReadCodec* CWbmpReadCodec::NewL(const TSize& aWbmpSize)

{

	CWbmpReadCodec* self = new(ELeave) CWbmpReadCodec(aWbmpSize);

	CleanupStack::PushL(self);

	self->ConstructL();

	CleanupStack::Pop(self); 

	return self;

}

TFrameState CWbmpReadCodec::ProcessFrameL(TBufPtr8& aSrc)

	{

	const TUint8* srcStart = aSrc.Ptr();

	iDataPtr = srcStart;

	iDataPtrLimit = srcStart + aSrc.Length();

	DoProcessL();

	TInt bytesUsed = iDataPtr - srcStart;

	aSrc.Shift(bytesUsed);

	iBytesProcessed += bytesUsed;

	if (iBytesProcessed >= iBytesExpected)

		{

		ImageProcessor()->FlushPixels();

		return EFrameComplete;

		}

	return EFrameIncomplete;

	}

void CWbmpReadCodec::DoProcessL()

	{

	CImageProcessor*const imageProc = ImageProcessor();

	while (iDataPtr < iDataPtrLimit)

		{

		TUint8 value = *iDataPtr++;

		// code will compare value with successive masks 0x80, 0x40 etc downto but not including 0

		for (TUint mask=0x80; mask!=0; mask >>= 1)

			imageProc->SetPixel((value & mask) ? KRgbWhite : KRgbBlack);

		}

	}

void CWbmpReadCodec::InitFrameL(TFrameInfo& /*aFrameInfo*/, CFrameImageData& /*aFrameImageData*/, TBool aDisableErrorDiffusion, CFbsBitmap& aFrame, CFbsBitmap* /*aDestinationMask*/)

	{

	Pos().SetXY(0,0);

	const TSize destinationSize(aFrame.SizeInPixels());

	TInt reductionFactor = ReductionFactor(iOriginalSize, destinationSize);

	CImageProcessor* imageProc = ImageProcessorUtility::NewImageProcessorL(aFrame, reductionFactor, EGray2, aDisableErrorDiffusion);

	SetImageProcessor(imageProc);

	imageProc->PrepareL(aFrame,iOriginalSize);

	iBytesProcessed = 0;

	// clear bitmap so partial decodes don't produce rubbish on screen

	ClearBitmapL(aFrame, KRgbWhite);

	TInt actualWidth = (iOriginalSize.iWidth + 7) & ~7;

	imageProc->SetPixelPadding(actualWidth - iOriginalSize.iWidth);

	iBytesExpected = (actualWidth >> 3) * iOriginalSize.iHeight;

	}