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// Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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//
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#ifndef __BITMAPCOMPR_H__
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#define __BITMAPCOMPR_H__
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//Forward declaration
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class TLineScanningPosition;
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//Global function used by 12, 16, 24 bpp scan line decompression methods
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void AdjustLineScanningPosition(TLineScanningPosition& aLineScanPos,
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const TUint32* aBase,
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TInt aBitmapWidth,
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TInt aStartPos,
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TInt aCompressedDataBytes);
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/**
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Possible values for the template argument of TScanLineDecompressor class.
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@internalComponent
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*/
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typedef enum
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{
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E2bpp = 2,
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E3bpp = 3,
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E4bpp = 4
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} TScanLineDecompressorType;
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/**
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This functor class is used for bitmap scanline decompression.
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Possible values for the template argument of TScanLineDecompressor class are enumerated
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in TScanLineDecompressorType enum.
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Note: "BPP" means "bytes per pixel for source buffer".
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Note: "BPP_DEST" means "bytes per pixel for destination buffer".
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Note: Template class design was preffered to base-derived class design (with virtual
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CopyPixel() method), because performance is more important than code size for bitmap
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scanline decompression.
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@internalComponent
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*/
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template <TInt BPP, TInt BPP_DEST>
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class TScanLineDecompressor
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{
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public:
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TScanLineDecompressor(const TUint32* aBase,
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TInt aComprDataBytes,
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TBool aCanAdjustLineScanPos);
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void operator()(TUint8* aDestBuffer, const TPoint& aPixel,
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TLineScanningPosition& aLineScanPos, TInt aByteWidth, TInt aDestByteWidth, TInt aLength) const;
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private:
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TInt CalcStartPos(const TPoint& aPixel, TInt aByteWidth) const;
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TInt CalcDestStartPos(const TPoint& aPixel, TInt aByteWidth) const;
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TInt CalcEndPos(TInt aLength, const TPoint& aPixel, TInt aByteWidth) const;
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TUint8* CalcDestPtr(const TUint8* aDestBuffer, const TPoint& aPixel) const;
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TUint8* CalcDestPtrLimit(const TUint8* aDestPtr, const TPoint& aPixel, TInt aByteWidth,
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TInt aLength, TInt aStartPos) const;
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TInt CalcAvailDestSpace(const TUint8* aDestPtr, const TUint8* aDestPtrLimit) const;
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TUint8* AdjustLineScanningPosition(TLineScanningPosition& aLineScanPos, TInt aByteWidth,
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TInt aStartPos) const;
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TUint8* CopyPixel(TUint8* aDestPtr, const TUint8* aSrcPtr, TInt aCount) const;
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TUint8* CopyBlockPixel(TUint8* aDestPtr, const TUint8* aSrcPtr, TInt aCount) const;
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TScanLineDecompressor(const TScanLineDecompressor&);//prevent default copy constructor
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TScanLineDecompressor& operator=(const TScanLineDecompressor&);//prevent default "=" operator
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private:
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const TUint32* iBase;
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const TInt iComprDataBytes;
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const TBool iCanAdjustLineScanPos;
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};
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#include "BitmapCompr.inl"
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#endif//__BITMAPCOMPR_H__
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