MaskFilter maskFilter

A mask filter (for example, a blur) to apply to a shape after it has been drawn but before it has been composited into the image.

See MaskFilter for details.

Source 

MaskFilter get maskFilter {
  if (_objects == null)
    return null;
  return _objects[_kMaskFilterIndex];
}
void maskFilter=(MaskFilter value)

Source 

set maskFilter(MaskFilter value) {
  _objects ??= new List<dynamic>(_kObjectCount);
  _objects[_kMaskFilterIndex] = value;
}