svtools/inc/gifread.hxx

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  30
  31 #ifndef _GIFREAD_HXX
  32 #define _GIFREAD_HXX
  33
  34 #ifndef _GRAPH_HXX
  35 #include <vcl/graph.hxx>
  36 #endif
  37 #ifndef _BMPACC_HXX
  38 #include <vcl/bmpacc.hxx>
  39 #endif
  40
  41 #ifdef _GIFPRIVATE
  42
  43 // ---------
  44 // - Enums -
  45 // ---------
  46
  47 enum GIFAction
  48 {
  49     GLOBAL_HEADER_READING,
  50     MARKER_READING,
  51     EXTENSION_READING,
  52     LOCAL_HEADER_READING,
  53     FIRST_BLOCK_READING,
  54     NEXT_BLOCK_READING,
  55     ABORT_READING,
  56     END_READING
  57 };
  58
  59 // ------------------------------------------------------------------------
  60
  61 enum ReadState
  62 {
  63     GIFREAD_OK,
  64     GIFREAD_ERROR,
  65     GIFREAD_NEED_MORE
  66 };
  67
  68 // -------------
  69 // - GIFReader -
  70 // -------------
  71
  72 class GIFLZWDecompressor;
  73
  74 class SvStream;
  75
  76 class GIFReader : public GraphicReader
  77 {
  78     Graphic                             aImGraphic;
  79     Animation                   aAnimation;
  80     Bitmap                              aBmp8;
  81     Bitmap                              aBmp1;
  82     BitmapPalette               aGPalette;
  83     BitmapPalette               aLPalette;
  84     SvStream&                   rIStm;
  85     void*                               pCallerData;
  86     HPBYTE                              pSrcBuf;
  87     GIFLZWDecompressor* pDecomp;
  88     BitmapWriteAccess*  pAcc8;
  89     BitmapWriteAccess*  pAcc1;
  90     long                                nYAcc;
  91     long                                nLastPos;
  92     sal_uInt32                  nLogWidth100;
  93     sal_uInt32                  nLogHeight100;
  94     USHORT                              nTimer;
  95     USHORT                              nGlobalWidth;                   // maximale Bildbreite aus Header
  96     USHORT                              nGlobalHeight;                  // maximale Bildhoehe aus Header
  97     USHORT                              nImageWidth;                    // maximale Bildbreite aus Header
  98     USHORT                              nImageHeight;                   // maximale Bildhoehe aus Header
  99     USHORT                              nImagePosX;
 100     USHORT                              nImagePosY;
 101     USHORT                              nImageX;                                // maximale Bildbreite aus Header
 102     USHORT                              nImageY;                                // maximale Bildhoehe aus Header
 103     USHORT                              nLastImageY;
 104     USHORT                              nLastInterCount;
 105     USHORT                              nLoops;
 106     GIFAction                   eActAction;
 107     BOOL                                bStatus;
 108     BOOL                                bGCTransparent;                 // Ob das Bild Transparent ist, wenn ja:
 109     BOOL                                bInterlaced;
 110     BOOL                                bOverreadBlock;
 111     BOOL                                bImGraphicReady;
 112     BOOL                                bGlobalPalette;
 113     BYTE                                nBackgroundColor;               // Hintergrundfarbe
 114     BYTE                                nGCTransparentIndex;    // Pixel von diesem Index sind durchsichtig
 115     BYTE                                nGCDisposalMethod;              // 'Disposal Method' (siehe GIF-Doku)
 116     BYTE                                cTransIndex1;
 117     BYTE                                cNonTransIndex1;
 118
 119     void                                ReadPaletteEntries( BitmapPalette* pPal, ULONG nCount );
 120     void                                ClearImageExtensions();
 121     BOOL                                CreateBitmaps( long nWidth, long nHeight, BitmapPalette* pPal, BOOL bWatchForBackgroundColor );
 122     BOOL                                ReadGlobalHeader();
 123     BOOL                                ReadExtension();
 124     BOOL                                ReadLocalHeader();
 125     ULONG                               ReadNextBlock();
 126     void                                FillImages( HPBYTE pBytes, ULONG nCount );
 127     void                                CreateNewBitmaps();
 128     BOOL                                ProcessGIF();
 129
 130 public:
 131
 132     ReadState                   ReadGIF( Graphic& rGraphic );
 133     const Graphic&              GetIntermediateGraphic();
 134
 135                         GIFReader( SvStream& rStm );
 136     virtual                             ~GIFReader();
 137 };
 138
 139 #endif // _GIFPRIVATE
 140
 141 // -------------
 142 // - ImportGIF -
 143 // -------------
 144
 145  BOOL ImportGIF( SvStream& rStream, Graphic& rGraphic );
 146
 147 #endif // _GIFREAD_HXX