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examples/Multimedia/ICL/ICLCodec/PngScanlineEncoder.h

00001 // PngScanlineEncoder.h
00002 //
00003 // Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).
00004 // All rights reserved.
00005 // This component and the accompanying materials are made available
00006 // under the terms of "Eclipse Public License v1.0"
00007 // which accompanies this distribution, and is available
00008 // at the URL "http://www.eclipse.org/legal/epl-v10.html".
00009 //
00010 // Initial Contributors:
00011 // Nokia Corporation - initial contribution.
00012 //
00013 // Contributors:
00014 //
00015 // Description:
00016 //
00017 //
00018 
00019 #ifndef __PNGSCANLINEENCODER_H__
00020 #define __PNGSCANLINEENCODER_H__
00021 
00022 #include "PNGCodec.h"
00023 #include "ImageUtils.h"
00024 
00025 //
00026 // These classes specialise the PNG writer to write
00027 // scanlines with different bitmap depths/colour types
00028 //
00029 
00030 const TInt KPngScanlineFilterTypeLength = 1;
00031 
00032 //
00033 // CBitDepth1Encoder: specialised writer for 1bpp
00034 //
00035 
00036 const TInt KPngDepth1PixelsPerByte = 8;
00037 const TInt KPngDepth1RoundUpValue = 7;
00038 const TInt KPngDepth1ShiftValue = 1;
00039 
00040 class CBitDepth1Encoder : public CPngWriteSubCodec
00041         {
00042 private:
00043         virtual void DoConstructL();
00044         virtual TInt ScanlineBufferSize(TInt aPixelLength);
00045         virtual void DoEncode(const CFbsBitmap* aSource, const TInt aScanline,
00046                                         TUint8* aDataPtr, const TUint8* aDataPtrLimit);
00047         };
00048 
00049 //
00050 // CBitDepth2Encoder: specialised writer for 2bpp
00051 //
00052 
00053 const TInt KPngDepth2PixelsPerByte = 4;
00054 const TInt KPngDepth2RoundUpValue = 3;
00055 const TInt KPngDepth2ShiftValue = 2;
00056 class CBitDepth2Encoder : public CPngWriteSubCodec
00057         {
00058 private:
00059         virtual void DoConstructL();
00060         virtual TInt ScanlineBufferSize(TInt aPixelLength);
00061         virtual void DoEncode(const CFbsBitmap* aSource, const TInt aScanline,
00062                                         TUint8* aDataPtr, const TUint8* aDataPtrLimit);
00063         };
00064 
00065 //
00066 // CBitDepth4Encoder: specialised writer for 4bpp
00067 //
00068 
00069 const TInt KPngDepth4PixelsPerByte = 2;
00070 const TInt KPngDepth4RoundUpValue = 1;
00071 const TInt KPngDepth4ShiftValue = 4;
00072 class CBitDepth4Encoder : public CPngWriteSubCodec
00073         {
00074 private:
00075         virtual void DoConstructL();
00076         virtual TInt ScanlineBufferSize(TInt aPixelLength);
00077         virtual void DoEncode(const CFbsBitmap* aSource, const TInt aScanline,
00078                                         TUint8* aDataPtr, const TUint8* aDataPtrLimit);
00079         };
00080 
00081 //
00082 // CBitDepth8ColorType2Encoder: specialised writer for 8bpp, RGB colour
00083 //
00084 const TInt KPngDepth8RgbBytesPerPixel = 3;
00085 class CBitDepth8ColorType2Encoder : public CPngWriteSubCodec
00086         {
00087 private:
00088         virtual TInt ScanlineBufferSize(TInt aPixelLength);
00089         virtual void DoEncode(const CFbsBitmap* aSource, const TInt aScanline,
00090                                         TUint8* aDataPtr, const TUint8* aDataPtrLimit);
00091         };
00092 
00093 //
00094 // CBitDepth8Encoder: specialised writer for 8bpp
00095 //
00096 
00097 const TInt KPngDepth8PixelsPerByte = 1;
00098 const TInt KPngDepth8ShiftValue = 0;
00099 class CBitDepth8Encoder : public CPngWriteSubCodec
00100         {
00101 private:
00102         virtual void DoConstructL();
00103         virtual TInt ScanlineBufferSize(TInt aPixelLength);
00104         virtual void DoEncode(const CFbsBitmap* aSource, const TInt aScanline,
00105                                         TUint8* aDataPtr, const TUint8* aDataPtrLimit);
00106         };
00107 
00108 #endif // __PNGSCANLINEENCODER_H__
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