author | Gareth Stockwell <gareth.stockwell@accenture.com> |
Fri, 22 Oct 2010 11:38:29 +0100 | |
branch | bug235_bringup_0 |
changeset 206 | c170e304623f |
parent 0 | 5d03bc08d59c |
permissions | -rw-r--r-- |
// Copyright (c) 2003-2009 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 __BITMAPCOMPR_H__ #define __BITMAPCOMPR_H__ //Forward declaration class TLineScanningPosition; //Global function used by 12, 16, 24 bpp scan line decompression methods void AdjustLineScanningPosition(TLineScanningPosition& aLineScanPos, const TUint32* aBase, TInt aBitmapWidth, TInt aStartPos, TInt aCompressedDataBytes); /** Possible values for the template argument of TScanLineDecompressor class. @internalComponent */ typedef enum { E2bpp = 2, E3bpp = 3, E4bpp = 4 } TScanLineDecompressorType; /** This functor class is used for bitmap scanline decompression. Possible values for the template argument of TScanLineDecompressor class are enumerated in TScanLineDecompressorType enum. Note: "BPP" means "bytes per pixel for source buffer". Note: "BPP_DEST" means "bytes per pixel for destination buffer". Note: Template class design was preffered to base-derived class design (with virtual CopyPixel() method), because performance is more important than code size for bitmap scanline decompression. @internalComponent */ template <TInt BPP, TInt BPP_DEST> class TScanLineDecompressor { public: TScanLineDecompressor(const TUint32* aBase, TInt aComprDataBytes, TBool aCanAdjustLineScanPos); void operator()(TUint8* aDestBuffer, const TPoint& aPixel, TLineScanningPosition& aLineScanPos, TInt aByteWidth, TInt aDestByteWidth, TInt aLength) const; private: TInt CalcStartPos(const TPoint& aPixel, TInt aByteWidth) const; TInt CalcDestStartPos(const TPoint& aPixel, TInt aByteWidth) const; TInt CalcEndPos(TInt aLength, const TPoint& aPixel, TInt aByteWidth) const; TUint8* CalcDestPtr(const TUint8* aDestBuffer, const TPoint& aPixel) const; TUint8* CalcDestPtrLimit(const TUint8* aDestPtr, const TPoint& aPixel, TInt aByteWidth, TInt aLength, TInt aStartPos) const; TInt CalcAvailDestSpace(const TUint8* aDestPtr, const TUint8* aDestPtrLimit) const; TUint8* AdjustLineScanningPosition(TLineScanningPosition& aLineScanPos, TInt aByteWidth, TInt aStartPos) const; TUint8* CopyPixel(TUint8* aDestPtr, const TUint8* aSrcPtr, TInt aCount) const; TUint8* CopyBlockPixel(TUint8* aDestPtr, const TUint8* aSrcPtr, TInt aCount) const; TScanLineDecompressor(const TScanLineDecompressor&);//prevent default copy constructor TScanLineDecompressor& operator=(const TScanLineDecompressor&);//prevent default "=" operator private: const TUint32* iBase; const TInt iComprDataBytes; const TBool iCanAdjustLineScanPos; }; #include "BitmapCompr.inl" #endif//__BITMAPCOMPR_H__