goodies/source/filter.vcl/itiff/ccidecom.hxx

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  30
  31 #ifndef _CCIDECOM_HXX
  32 #define _CCIDECOM_HXX
  33
  34 #include <tools/stream.hxx>
  35
  36
  37 #define CCI_OPTION_2D                           1               // 2D-Komprimierung (statt 1D)
  38 #define CCI_OPTION_EOL                          2               // EOL-Codes am Ende jeder Zeile vorhanden
  39 #define CCI_OPTION_BYTEALIGNEOL         4               // Fuellbits vor jedem EOL-Code, so dass
  40                                             // Ende von EOL auf Bytes aligend
  41 #define CCI_OPTION_BYTEALIGNROW         8               // Rows beginnen immer auf Byte-Grenze
  42 #define CCI_OPTION_INVERSEBITORDER      16
  43
  44 // Eintrag in eine Huffman-Tabelle:
  45 struct CCIHuffmanTableEntry {
  46     USHORT nValue;    // Der Daten-Wert.
  47     USHORT nCode;     // Der Code durch den der Daten-Wert repraesentiert wird.
  48     USHORT nCodeBits; // Laenge des Codes in Bits.
  49 };
  50
  51
  52 // Eintrag in eine Hash-Tabelle zur schnellen Dekodierung
  53 struct CCILookUpTableEntry {
  54     USHORT nValue;
  55     USHORT nCodeBits;
  56 };
  57
  58
  59 class CCIDecompressor {
  60
  61 public:
  62
  63     CCIDecompressor( ULONG nOptions, UINT32 nImageWidth );
  64     ~CCIDecompressor();
  65
  66     void StartDecompression( SvStream & rIStream );
  67
  68     BOOL DecompressScanline(BYTE * pTarget, ULONG nTargetBits );
  69
  70 private:
  71
  72     void MakeLookUp(const CCIHuffmanTableEntry * pHufTab,
  73                     const CCIHuffmanTableEntry * pHufTabSave,
  74                     CCILookUpTableEntry * pLookUp,
  75                     USHORT nHuffmanTableSize,
  76                     USHORT nMaxCodeBits);
  77
  78     BOOL ReadEOL( UINT32 nMaxFillBits );
  79
  80     BOOL Read2DTag();
  81
  82     BYTE ReadBlackOrWhite();
  83
  84     USHORT ReadCodeAndDecode(const CCILookUpTableEntry * pLookUp,
  85                              USHORT nMaxCodeBits);
  86
  87     void FillBits(BYTE * pTarget, USHORT nTargetBits,
  88                   USHORT nBitPos, USHORT nNumBits,
  89                   BYTE nBlackOrWhite);
  90
  91     USHORT CountBits(const BYTE * pData, USHORT nDataSizeBits,
  92                      USHORT nBitPos, BYTE nBlackOrWhite);
  93
  94     void Read1DScanlineData(BYTE * pTarget, USHORT nTargetBits);
  95
  96     void Read2DScanlineData(BYTE * pTarget, USHORT nTargetBits);
  97
  98     BOOL bTableBad;
  99
 100     BOOL bStatus;
 101
 102     BYTE* pByteSwap;
 103
 104     SvStream * pIStream;
 105
 106     UINT32 nEOLCount;
 107
 108     UINT32 nWidth;
 109
 110     ULONG nOptions;
 111
 112     BOOL bFirstEOL;
 113
 114     CCILookUpTableEntry * pWhiteLookUp;
 115     CCILookUpTableEntry * pBlackLookUp;
 116     CCILookUpTableEntry * p2DModeLookUp;
 117     CCILookUpTableEntry * pUncompLookUp;
 118
 119     ULONG nInputBitsBuf;
 120     USHORT nInputBitsBufSize;
 121
 122     BYTE * pLastLine;
 123     ULONG nLastLineSize;
 124 };
 125
 126
 127 #endif
 128