protected override byte[] CreateNormalizedOverlayData(int overlayGroupNumber, int overlayFrameNumber)
{
int frameIndex = overlayFrameNumber - 1;
int overlayIndex = overlayGroupNumber - 1;
byte[] overlayData = null;
OverlayPlaneModuleIod opmi = new OverlayPlaneModuleIod(this.Parent);
if (opmi.HasOverlayPlane(overlayIndex))
{
OverlayPlane overlayPlane = opmi[overlayIndex];
if (_overlayData[overlayIndex] == null)
{
if (IsOverlayEmbedded(overlayPlane))
{
this.GetNormalizedPixelData();
}
else
{
int bitOffset;
overlayPlane.TryComputeOverlayDataBitOffset(frameIndex, out bitOffset);
OverlayData od = new OverlayData(bitOffset,
overlayPlane.OverlayRows,
overlayPlane.OverlayColumns,
overlayPlane.IsBigEndianOW,
overlayPlane.OverlayData);
_overlayData[overlayIndex] = od.Unpack();
}
}
overlayData = _overlayData[overlayIndex];
}
return(overlayData);
}
