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