class_docstr: A "buffered" filter pen that accumulates contour data, passes
  it through a ``filterContour`` method when the contour is closed or ended,
  and finally draws the result with the output pen.
  
  Components are passed through unchanged.
code: def __init__(self, outPen):
      super(ContourFilterPen, self).__init__()
      self._outPen = outPen
  
imports: from fontTools.pens.basePen import AbstractPen
  from fontTools.pens.pointPen import AbstractPointPen
  from fontTools.pens.recordingPen import RecordingPen
label_desc: Use image node_id 1 to create a new ContourFilterPen object from inherited base classes: _PassThruComponentsMixin, RecordingPen with example: obj = ContourFilterPen(outPen)