1 // Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

     4 // under the terms of "Eclipse Public License v1.0"

     5 // which accompanies this distribution, and is available

     6 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 //

    15 

    16 #ifndef __BITMAPCOMPR_H__

    17 #define __BITMAPCOMPR_H__

    18 

    19 //Forward declaration

    20 class TLineScanningPosition;

    21 //Global function used by 12, 16, 24 bpp scan line decompression methods

    22 void AdjustLineScanningPosition(TLineScanningPosition& aLineScanPos, 

    23 								const TUint32* aBase, 

    24 								TInt aBitmapWidth, 

    25 								TInt aStartPos,

    26 								TInt aCompressedDataBytes);

    27 

    28 /**

    29 Possible values for the template argument of TScanLineDecompressor class.

    30 @internalComponent

    31 */

    32 typedef enum

    33 	{

    34 	E2bpp = 2,

    35 	E3bpp = 3,

    36 	E4bpp = 4

    37 	} TScanLineDecompressorType;

    38 

    39 /**

    40 This functor class is used for bitmap scanline decompression.

    41 Possible values for the template argument of TScanLineDecompressor class are enumerated

    42 in TScanLineDecompressorType enum.

    43 Note: "BPP" means "bytes per pixel for source buffer".

    44 Note: "BPP_DEST" means "bytes per pixel for destination buffer".

    45 Note: Template class design was preffered to base-derived class design (with virtual 

    46 CopyPixel() method), because performance is more important than code size for bitmap

    47 scanline decompression.

    48 @internalComponent

    49 */

    50 template <TInt BPP, TInt BPP_DEST> 

    51 class TScanLineDecompressor

    52 	{

    53 public:

    54 	TScanLineDecompressor(const TUint32* aBase, 

    55 							TInt aComprDataBytes, 

    56 							TBool aCanAdjustLineScanPos);

    57 	void operator()(TUint8* aDestBuffer, const TPoint& aPixel, 

    58 					TLineScanningPosition& aLineScanPos, TInt aByteWidth, TInt aDestByteWidth, TInt aLength) const;

    59 

    60 private:

    61 	TInt CalcStartPos(const TPoint& aPixel, TInt aByteWidth) const;

    62 	TInt CalcDestStartPos(const TPoint& aPixel, TInt aByteWidth) const;

    63 	TInt CalcEndPos(TInt aLength, const TPoint& aPixel, TInt aByteWidth) const;

    64 	TUint8* CalcDestPtr(const TUint8* aDestBuffer, const TPoint& aPixel) const;

    65 	TUint8* CalcDestPtrLimit(const TUint8* aDestPtr, const TPoint& aPixel, TInt aByteWidth, 

    66 								TInt aLength, TInt aStartPos) const;

    67 	TInt CalcAvailDestSpace(const TUint8* aDestPtr, const TUint8* aDestPtrLimit) const;

    68 	TUint8* AdjustLineScanningPosition(TLineScanningPosition& aLineScanPos, TInt aByteWidth, 

    69 										TInt aStartPos) const;

    70 	TUint8* CopyPixel(TUint8* aDestPtr, const TUint8* aSrcPtr, TInt aCount) const;

    71 	TUint8* CopyBlockPixel(TUint8* aDestPtr, const TUint8* aSrcPtr, TInt aCount) const;

    72 

    73 	TScanLineDecompressor(const TScanLineDecompressor&);//prevent default copy constructor

    74 	TScanLineDecompressor& operator=(const TScanLineDecompressor&);//prevent default "=" operator

    75 

    76 private:

    77 	const TUint32* iBase;

    78 	const TInt iComprDataBytes;

    79 	const TBool iCanAdjustLineScanPos;

    80 

    81 	};

    82 

    83 #include "BitmapCompr.inl"

    84 

    85 #endif//__BITMAPCOMPR_H__

    86