// 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:

//

#ifndef __TIFFFAX_H__

#define __TIFFFAX_H__

#include "TIFFCodec.h"

// Base class for 1d Tiff fax decoders

enum TTiffFaxCodeType

{

	ETiffFaxBlackRun,

	ETiffFaxWhiteRun,

	ETiffFaxEndOfLineCode

};

enum TTiffFaxState

	{

	ETiffFaxUnderflow,

	ETiffFaxPixelRun,

	ETiffFaxEndOfLine,

	ETiffFaxEndOfFax,

	ETiffFaxInvalid

	};

class CTiffFax1dDecoder : public CTiffReadSubCodec

	{

protected:

	virtual ~CTiffFax1dDecoder();

	// From CTiffImageDecoder

	virtual void	DoNewFrameL(CFbsBitmap& aBitmap, TBool aDisableErrorDiffusion, TInt aReductionFactor);

	virtual void	NewStripL(TInt aNumBytes);

	virtual TBool	ProcessStripL(TBufPtr8* aSrc);

	// New

	void					ConstructL(const TTiffImageData& aImageData);

	virtual TTiffFaxState	ProcessNextCode() = 0;

	virtual void			NewRow();

	void					UseBits(TInt aNumBits);

	TTiffFaxState			Decode1d();

	TTiffFaxState			DecodeBlack();

	TTiffFaxState			DecodeWhite();

	TTiffFaxState			DecodeEndOfLine();

protected:

	// Info

	const TTiffImageData*	iImageData;

	// Input

	const TUint8*				iSourcePtr;

	const TUint8*				iSourcePtrLimit;

	TBool				iReverseBitsInByte;

	TInt32				iBitCache;

	TInt				iBitCacheLength;

	// Decoding

	TTiffFaxCodeType	iColor;

	TTiffFaxCodeType	iCodeType;

	TInt				iCodeCount;

	// Buffer

	TInt*				iRunData;

	TInt				iRunDataIndex;

	TInt				iRowWidth;

	TInt				iPixelsStoredInRow;

	// Output

	TInt				iRowNumber;

	TInt				iRowsRemaining;

	CImageProcessor* iImageProcessor;

	TRgb				iBlack;

	TRgb				iWhite;

	};

// Base class for 2d Tiff fax decoders

class CTiffFax2dDecoder : public CTiffFax1dDecoder

	{

protected:

	virtual ~CTiffFax2dDecoder();

	// From CTiffFax1dDecoder 

	virtual void			NewStripL(TInt aNumBytes);

	virtual void			NewRow();

	// New

	void					ConstructL(const TTiffImageData& aImageData);

	TTiffFaxState			Decode2d();

	TTiffFaxState			DecodeHorizontal();

	TTiffFaxState			DecodeVertical(TInt aDifference);

	TTiffFaxState			DecodePass();

protected:

	TInt*					iReferenceRunData;

	TInt					iReferenceRunDataIndex;

	TInt					iHorizontalCodeCount;

	TInt					iA0;

	};

// Group 3 fax, 1 dimentional decoder

class CTiffGroup3Fax1dDecoder : public CTiffFax1dDecoder

	{

public:

	static CTiffGroup3Fax1dDecoder* NewL(const TTiffImageData& aImageData);

protected:

	// From CTiffFax1dDecoder

	virtual TTiffFaxState	ProcessNextCode();

	};

// Group 3 fax, 2 dimentional decoder

class CTiffGroup3Fax2dDecoder : public CTiffFax2dDecoder

	{

public:

	static CTiffGroup3Fax2dDecoder* NewL(const TTiffImageData& aImageInfo);

	// From CTiffFax2dDecoder

	virtual void			NewStripL(TInt aNumBytes);

	virtual void			NewRow();

protected:

	virtual TTiffFaxState	ProcessNextCode();

private:

	enum TState

		{

		E1d,

		E2d,

		ESelect1d2d,

		};

	TState	iState;

	};

// Group 4 fax decoder

class CTiffGroup4FaxDecoder : public CTiffFax2dDecoder

	{

public:

	static CTiffGroup4FaxDecoder* NewL(const TTiffImageData& aImageData);

protected:

	// From CTiffFax1dDecoder

	virtual TTiffFaxState	ProcessNextCode();

	};

#endif