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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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/**
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The created class instance doesn't take the ownership on aBase parameter.
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@internalComponent
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@pre aBase != NULL
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@param aBase Points to the beginning of compressed bitmap data
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@param aComprDataBytes Total amount of compressed bitmap bytes
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@param aCanAdjustLineScanPos If not EFalse - scanline position can be adjusted calling
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AdjustLineScanningPosition function.
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@see AdjustLineScanningPosition(TLineScanningPosition& aLineScanPos, const TUint32* aBase, TInt aBitmapWidth, TInt aStartPos, TInt aCompressedDataBytes);
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*/
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template <TInt BPP, TInt BPP_DEST>
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TScanLineDecompressor<BPP, BPP_DEST>::TScanLineDecompressor(const TUint32* aBase,
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TInt aComprDataBytes,
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TBool aCanAdjustLineScanPos) :
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iBase(aBase),
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iComprDataBytes(aComprDataBytes),
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iCanAdjustLineScanPos(aCanAdjustLineScanPos)
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{
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}
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/**
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The method calculates the start byte position (as a index) in decompressed bitmap data .
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@internalComponent
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@param aPixel The decompression starts from this pixel
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@param aByteWidth Scanline width in bytes
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@return Calculated start position.
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*/
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template <TInt BPP, TInt BPP_DEST>
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TInt TScanLineDecompressor<BPP, BPP_DEST>::CalcStartPos(const TPoint& aPixel, TInt aByteWidth) const
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{
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return aPixel.iY * aByteWidth + aPixel.iX * BPP;
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}
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/**
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The method calculates the start byte position (as a index) in decompressed bitmap data .
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@internalComponent
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@param aPixel The decompression starts from this pixel
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@param aByteWidth Scanline width in bytes
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@return Calculated start position.
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*/
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template <TInt BPP, TInt BPP_DEST>
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TInt TScanLineDecompressor<BPP, BPP_DEST>::CalcDestStartPos(const TPoint& aPixel, TInt aByteWidth) const
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{
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return aPixel.iY * aByteWidth + aPixel.iX * BPP_DEST;
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}
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/**
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The method calculates the end byte position (as a index) in decompressed bitmap data .
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@internalComponent
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@param aLength Length in pixels of bitmap data we want to decompress.
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@param aPixel The decompression starts from this pixel
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@param aByteWidth Scanline width in bytes
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@return Calculated end position.
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*/
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template <TInt BPP, TInt BPP_DEST>
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TInt TScanLineDecompressor<BPP, BPP_DEST>::CalcEndPos(TInt aLength, const TPoint& aPixel,
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TInt aByteWidth) const
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{
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return aPixel.iY * aByteWidth + (aPixel.iX + aLength) * BPP_DEST;
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}
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/**
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The method calculates a pointer to a place in aDestBuffer where the
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copying of decompressed bitmap data starts.
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@internalComponent
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@param aDestBuffer Points to the start of the destination buffer.
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@param aPixel The decompression starts from this pixel
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@return A pointer to a place in aDestBuffer where the
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copying of decompressed bitmap data starts.
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*/
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template <TInt BPP, TInt BPP_DEST>
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TUint8* TScanLineDecompressor<BPP, BPP_DEST>::CalcDestPtr(const TUint8* aDestBuffer,
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const TPoint& aPixel) const
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{
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return const_cast <TUint8*> (aDestBuffer + aPixel.iX * BPP_DEST);
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}
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/**
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The method calculates a pointer to a place in aDestBuffer where the copying
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of the decompressed data stops.
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@internalComponent
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@param aDestPtr A pointer to a place in aDestBuffer where the
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copying of decompressed bitmap data starts - CalcDestPtr() return value.
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@param aPixel The decompression starts from this pixel
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@param aByteWidth Scanline width in bytes
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@param aLength Length in pixels of bitmap data we want to decompress.
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@param aStartPos CalcStartPos() method return value.
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@return A pointer to a place in aDestBuffer where the
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copying of decompressed bitmap data stops.
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@see CalcDestPtr
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@see CalcStartPos
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*/
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template <TInt BPP, TInt BPP_DEST>
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TUint8* TScanLineDecompressor<BPP, BPP_DEST>::CalcDestPtrLimit(const TUint8* aDestPtr,
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const TPoint& aPixel, TInt aByteWidth,
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TInt aLength, TInt aStartPos) const
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{
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return const_cast <TUint8*> (aDestPtr + CalcEndPos(aLength, aPixel, aByteWidth) - aStartPos);
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}
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/**
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The method performs a quick find of the correct start position.
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It uses the fact that aLineScanPos parameter should be recalculated after each positioning
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in the compresed bitmap data and might be used in the next call of decompression methods.
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@internalComponent
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@param aLineScanPos Saved information about the last used position in the compressed data
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@param aByteWidth Scanline width in bytes
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@param aStartPos CalcStartPos() method return value.
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@return A pointer to a position in compressed bitmap data, where the decompression
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starts from
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@see CalcStartPos
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*/
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template <TInt BPP, TInt BPP_DEST>
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TUint8* TScanLineDecompressor<BPP, BPP_DEST>::AdjustLineScanningPosition(TLineScanningPosition& aLineScanPos,
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TInt aByteWidth,
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TInt aStartPos) const
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{
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TUint8* srcPtr = NULL;
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// Fast find the correct position to start
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if(iCanAdjustLineScanPos)
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{
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::AdjustLineScanningPosition(aLineScanPos, iBase, aByteWidth, aStartPos, iComprDataBytes);
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}
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srcPtr = aLineScanPos.iSrcDataPtr;
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//Unfortunatelly we can't move fast srcPtr if aLineScanPos.iCursorPos > aStartPos,
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//because we have 1 byte for the compressed data length and the data itself after the "length"
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//byte. With this information we can move srcPtr forward, not backward.
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if(aLineScanPos.iCursorPos > aStartPos)
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{
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srcPtr = (TUint8*)iBase;
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aLineScanPos.iCursorPos = 0;
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}
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TInt count = TInt8(*srcPtr);//pixels count
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TInt length = (count < 0 ? -count : count + 1) * BPP;//length in bytes
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//If count < 0 - we have a sequence of abs(count) pixels - abs(count) * BPP bytes
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//If count >= 0 - we have (count + 1) pixels with the same color - (count + 1) * BPP bytes
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while((aLineScanPos.iCursorPos + length) <= aStartPos)
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{
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srcPtr += count < 0 ? length + 1 : (BPP + 1);//(BPP + 1) - bytes for the pixel + 1 byte for the length
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aLineScanPos.iCursorPos += length;
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count = TInt8(*srcPtr);
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length = (count < 0 ? -count : count + 1) * BPP;
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}
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//After executing of the previous "if" operator and "while" loop, srcPtr points to
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//the nearest "length" byte before the start position in compressed bitmap data.
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return srcPtr;
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}
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/**
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This overloaded "()" operator used for decompression of bitmap scan lines.
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@internalComponent
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@param aDestBuffer Points to the destination buffer. After the call it fill be filled
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with the decomperssed data.
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@param aPixel The decompression starts from this pixel
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@param aLineScanPos Saved information about the last used position in the compressed data
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@param aByteWidth Scanline width in bytes
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@param aLength Length of requested decompressed data - in pixels
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*/
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template <TInt BPP, TInt BPP_DEST>
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void TScanLineDecompressor<BPP, BPP_DEST>::operator()(TUint8* aDestBuffer, const TPoint& aPixel,
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TLineScanningPosition& aLineScanPos,
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TInt aByteWidth, TInt aDestByteWidth, TInt aLength) const
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{
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TInt startPos = CalcStartPos(aPixel, aByteWidth);
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TInt destStartPos = CalcDestStartPos(aPixel, aDestByteWidth);
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TUint8* destPtr = CalcDestPtr(aDestBuffer, aPixel);
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const TUint8* destPtrLimit = CalcDestPtrLimit(destPtr, aPixel, aDestByteWidth, aLength, destStartPos);
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//Fast find the correct position to start
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TUint8* srcPtr = AdjustLineScanningPosition(aLineScanPos, aByteWidth, startPos);
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//Decompress each slot of compressed data which has the following format:
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// ...|"length byte"| "pixel value(s)" |...
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while(destPtr < destPtrLimit)
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{
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TInt pixelsInTheSlot = TInt8(*srcPtr++);
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TInt availDestSpaceInBytes = destPtrLimit - destPtr;
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TInt skipBytes = startPos - aLineScanPos.iCursorPos;
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if(pixelsInTheSlot < 0)
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{//a sequence of abs(pixelsInTheSlot) pixels with different color values
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TInt bytesInTheSlot = -pixelsInTheSlot * BPP;
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TUint8* start_pos = srcPtr;
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TInt bytesToCopy = bytesInTheSlot;
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if(skipBytes > 0) //Skip the pixels before the start possition
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{
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bytesToCopy -= skipBytes;
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start_pos += skipBytes;
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}
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if(BPP == BPP_DEST)
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{
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destPtr = Mem::Copy(destPtr, start_pos, ::Min(bytesToCopy, availDestSpaceInBytes));
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}
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else
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{
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destPtr = CopyBlockPixel(destPtr, start_pos, ::Min(bytesToCopy / BPP, availDestSpaceInBytes / BPP_DEST));
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}
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//Move to the next "length" byte only if everything,
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//controlled by the current "length" byte, is copied
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if((bytesToCopy / BPP) <= (availDestSpaceInBytes / BPP_DEST))
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{
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srcPtr += bytesInTheSlot;
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aLineScanPos.iCursorPos += bytesInTheSlot;
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}
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else
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{
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srcPtr--;
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}
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}
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else//the "else" part of - if(pixelsInTheSlot < 0)
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{//(pixelsInTheSlot + 1) pixels with the same color
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TInt pixelsToCopy = pixelsInTheSlot + 1;
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TInt bytesInTheSlot = pixelsToCopy * BPP;
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if(skipBytes > 0) //Skip the pixels before the start possition
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{
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pixelsToCopy -= skipBytes / BPP;
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}
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destPtr = CopyPixel(destPtr, srcPtr, ::Min(pixelsToCopy, availDestSpaceInBytes / BPP_DEST));
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//Move to the next "length" byte only if everything,
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//controlled by the current "length" byte, is copied
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if((pixelsToCopy * BPP) <= availDestSpaceInBytes)
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{
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srcPtr += BPP;// += BPP - we have (count + 1) pixels with the same color - only BPP bytes are used.
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aLineScanPos.iCursorPos += bytesInTheSlot;
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}
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else
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{
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srcPtr--;
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}
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}//end of - if(pixelsCnt < 0)
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}//end of - while(destPtr < destPtrLimit)
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aLineScanPos.iSrcDataPtr = srcPtr;//update aLineScanPos.iSrcDataPtr - it will be used
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//when the method is called again.
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}
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