// Decode a tile/strip and apply the predictor routine.
// Note that horizontal differencing must be done on a
// row-by-row basis. The width of a "row" has already
// been calculated at pre-decode time according to the
// strip/tile dimensions.
static bool PredictorDecodeTile(TIFF tif, byte[] op0, int occ0, ushort s)
{
TIFFPredictorState sp = (TIFFPredictorState)tif.tif_data;
if (sp.decodetile(tif, op0, occ0, s))
{
int rowsize = sp.rowsize;
#if DEBUG
if (rowsize <= 0)
{
throw new Exception("rowsize<=0");
}
#endif
int op0_offset = 0;
while (occ0 > 0)
{
sp.decodepfunc(tif, op0, op0_offset, rowsize);
occ0 -= rowsize;
op0_offset += rowsize;
}
return(true);
}
return(false);
}
// Decode a scanline and apply the predictor routine.
static bool PredictorDecodeRow(TIFF tif, byte[] op0, int occ0, ushort s)
{
TIFFPredictorState sp = (TIFFPredictorState)tif.tif_data;
if (sp.decoderow(tif, op0, occ0, s))
{
sp.decodepfunc(tif, op0, 0, occ0);
return(true);
}
return(false);
}
