// Copyright (c) 1997-2009 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 __PNGSCANLINEENCODER_H__

#define __PNGSCANLINEENCODER_H__

#include "PNGCodec.h"

#include "ImageUtils.h"

const TInt KPngScanlineFilterTypeLength = 1;

// CBitDepth1Encoder

const TInt KPngDepth1PixelsPerByte = 8;

const TInt KPngDepth1RoundUpValue = 7;

const TInt KPngDepth1ShiftValue = 1;

class CBitDepth1Encoder : public CPngWriteSubCodec

	{

private:

	virtual void DoConstructL();

	virtual TInt ScanlineBufferSize(TInt aPixelLength);

	virtual void DoEncode(const CFbsBitmap* aSource, const TInt aScanline,

					TUint8* aDataPtr, const TUint8* aDataPtrLimit);

	};

// CBitDepth2Encoder

const TInt KPngDepth2PixelsPerByte = 4;

const TInt KPngDepth2RoundUpValue = 3;

const TInt KPngDepth2ShiftValue = 2;

class CBitDepth2Encoder : public CPngWriteSubCodec

	{

private:

	virtual void DoConstructL();

	virtual TInt ScanlineBufferSize(TInt aPixelLength);

	virtual void DoEncode(const CFbsBitmap* aSource, const TInt aScanline,

					TUint8* aDataPtr, const TUint8* aDataPtrLimit);

	};

// CBitDepth4Encoder

const TInt KPngDepth4PixelsPerByte = 2;

const TInt KPngDepth4RoundUpValue = 1;

const TInt KPngDepth4ShiftValue = 4;

class CBitDepth4Encoder : public CPngWriteSubCodec

	{

private:

	virtual void DoConstructL();

	virtual TInt ScanlineBufferSize(TInt aPixelLength);

	virtual void DoEncode(const CFbsBitmap* aSource, const TInt aScanline,

					TUint8* aDataPtr, const TUint8* aDataPtrLimit);

	};

// CBitDepth8ColorType2Encoder

const TInt KPngDepth8RgbBytesPerPixel = 3;

class CBitDepth8ColorType2Encoder : public CPngWriteSubCodec

	{

private:

	virtual TInt ScanlineBufferSize(TInt aPixelLength);

	virtual void DoEncode(const CFbsBitmap* aSource, const TInt aScanline,

					TUint8* aDataPtr, const TUint8* aDataPtrLimit);

	};

// CBitDepth8Encoder

const TInt KPngDepth8PixelsPerByte = 1;

const TInt KPngDepth8ShiftValue = 0;

class CBitDepth8Encoder : public CPngWriteSubCodec

	{

private:

	virtual void DoConstructL();

	virtual TInt ScanlineBufferSize(TInt aPixelLength);

	virtual void DoEncode(const CFbsBitmap* aSource, const TInt aScanline,

					TUint8* aDataPtr, const TUint8* aDataPtrLimit);

	};

#endif // __PNGSCANLINEENCODER_H__