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

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

     4 // under the terms of "Eclipse Public License v1.0"

     5 // which accompanies this distribution, and is available

     6 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 //

    15 

    16 #include <fbs.h>

    17 #include "WBMPCodec.h"

    18 

    19 

    20 // CWbmpReadCodec

    21 CWbmpReadCodec::CWbmpReadCodec(const TSize& aWbmpSize):

    22 	iOriginalSize(aWbmpSize)

    23 	{}

    24 

    25 CWbmpReadCodec::~CWbmpReadCodec()

    26 	{

    27 	}

    28 

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

    30 {

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

    32 	CleanupStack::PushL(self);

    33 	self->ConstructL();

    34 	CleanupStack::Pop(self); 

    35 	return self;

    36 }

    37 

    38 

    39 TFrameState CWbmpReadCodec::ProcessFrameL(TBufPtr8& aSrc)

    40 	{

    41 	const TUint8* srcStart = aSrc.Ptr();

    42 	iDataPtr = srcStart;

    43 	iDataPtrLimit = srcStart + aSrc.Length();

    44 

    45 	DoProcessL();

    46 

    47 	TInt bytesUsed = iDataPtr - srcStart;

    48 	aSrc.Shift(bytesUsed);

    49 

    50 	iBytesProcessed += bytesUsed;

    51 	if (iBytesProcessed >= iBytesExpected)

    52 		{

    53 		ImageProcessor()->FlushPixels();

    54 		return EFrameComplete;

    55 		}

    56 

    57 	return EFrameIncomplete;

    58 	}

    59 

    60 void CWbmpReadCodec::DoProcessL()

    61 	{

    62 	CImageProcessor*const imageProc = ImageProcessor();

    63 	while (iDataPtr < iDataPtrLimit)

    64 		{

    65 		TUint8 value = *iDataPtr++;

    66 

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

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

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

    70 		}

    71 	}

    72 

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

    74 	{

    75 	Pos().SetXY(0,0);

    76 

    77 	const TSize destinationSize(aFrame.SizeInPixels());

    78 	TInt reductionFactor = ReductionFactor(iOriginalSize, destinationSize);

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

    80 	SetImageProcessor(imageProc);

    81 	imageProc->PrepareL(aFrame,iOriginalSize);

    82 

    83 	iBytesProcessed = 0;

    84 

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

    86 	ClearBitmapL(aFrame, KRgbWhite);

    87 

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

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

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

    91 	}

    92