code: def to_ufo_background_image(self, ufo_glyph, layer):
      
      image = layer.backgroundImage
      if image is None:
          return
      ufo_image = ufo_glyph.image
      ufo_image.fileName = image.path
      ufo_image.transformation = image.transform
      ufo_glyph.lib[CROP_KEY] = list(image.crop)
      ufo_glyph.lib[LOCKED_KEY] = image.locked
      ufo_glyph.lib[ALPHA_KEY] = image.alpha
docs: Copy the backgound image from the GSLayer to the UFO Glyph.