1 files changed, 85 insertions, 2 deletions
diff --git a/vcl/source/filter/igif/gifread.cxx b/vcl/source/filter/igif/gifread.cxx
index dd4e92584bdf..01060abb3a26 100644
--- a/vcl/source/filter/igif/gifread.cxx
+++ b/vcl/source/filter/igif/gifread.cxx
@@ -17,14 +17,97 @@
  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  */
 
-#define _GIFPRIVATE
-
 #include "decode.hxx"
 #include "gifread.hxx"
 #include <memory>
 
 #define NO_PENDING( rStm ) ( ( rStm ).GetError() != ERRCODE_IO_PENDING )
 
+enum GIFAction
+{
+    GLOBAL_HEADER_READING,
+    MARKER_READING,
+    EXTENSION_READING,
+    LOCAL_HEADER_READING,
+    FIRST_BLOCK_READING,
+    NEXT_BLOCK_READING,
+    ABORT_READING,
+    END_READING
+};
+
+enum ReadState
+{
+    GIFREAD_OK,
+    GIFREAD_ERROR,
+    GIFREAD_NEED_MORE
+};
+
+class GIFLZWDecompressor;
+
+class SvStream;
+
+class GIFReader : public GraphicReader
+{
+    Graphic             aImGraphic;
+    Animation           aAnimation;
+    Bitmap              aBmp8;
+    Bitmap              aBmp1;
+    BitmapPalette       aGPalette;
+    BitmapPalette       aLPalette;
+    SvStream&           rIStm;
+    sal_uInt8*          pSrcBuf;
+    GIFLZWDecompressor* pDecomp;
+    BitmapWriteAccess*  pAcc8;
+    BitmapWriteAccess*  pAcc1;
+    long                nYAcc;
+    long                nLastPos;
+    sal_uInt32          nLogWidth100;
+    sal_uInt32          nLogHeight100;
+    sal_uInt16          nTimer;
+    sal_uInt16          nGlobalWidth;           // maximum imagewidth from header
+    sal_uInt16          nGlobalHeight;          // maximum imageheight from header
+    sal_uInt16          nImageWidth;            // maximum screenwidth from header
+    sal_uInt16          nImageHeight;           // maximum screenheight from header
+    sal_uInt16          nImagePosX;
+    sal_uInt16          nImagePosY;
+    sal_uInt16          nImageX;                // maximum screenwidth from header
+    sal_uInt16          nImageY;                // maximum screenheight from header
+    sal_uInt16          nLastImageY;
+    sal_uInt16          nLastInterCount;
+    sal_uInt16          nLoops;
+    GIFAction           eActAction;
+    bool                bStatus;
+    bool                bGCTransparent;         // is the image transparent, if yes:
+    bool                bInterlaced;
+    bool                bOverreadBlock;
+    bool                bImGraphicReady;
+    bool                bGlobalPalette;
+    sal_uInt8           nBackgroundColor;       // backgroundcolour
+    sal_uInt8           nGCTransparentIndex;    // pixels of this index are transparant
+    sal_uInt8           nGCDisposalMethod;      // 'Disposal Method' (see GIF docs)
+    sal_uInt8           cTransIndex1;
+    sal_uInt8           cNonTransIndex1;
+
+    void                ReadPaletteEntries( BitmapPalette* pPal, sal_uLong nCount );
+    void                ClearImageExtensions();
+    void                CreateBitmaps( long nWidth, long nHeight, BitmapPalette* pPal, bool bWatchForBackgroundColor );
+    bool                ReadGlobalHeader();
+    bool                ReadExtension();
+    bool                ReadLocalHeader();
+    sal_uLong           ReadNextBlock();
+    void                FillImages( sal_uInt8* pBytes, sal_uLong nCount );
+    void                CreateNewBitmaps();
+    bool                ProcessGIF();
+
+public:
+
+    ReadState           ReadGIF( Graphic& rGraphic );
+    const Graphic&      GetIntermediateGraphic();
+
+    explicit            GIFReader( SvStream& rStm );
+    virtual             ~GIFReader();
+};
+
 GIFReader::GIFReader( SvStream& rStm )
     : aGPalette ( 256 )
     , aLPalette ( 256 )