class_docstr: Clips visual output to a rectangular region.
code: def transform(self, tr):
      if tr is self._transform:
          return
      self._transform = tr
      self.fshader["fb_to_clip"] = tr
  
file_path: vispy/vispy/visuals/filters/clipper.py
imports: from .base_filter import Filter
  from ..transforms import NullTransform
  from ...geometry import Rect
label_desc: Use image node_id 5 for calling the Clipper obj's underlying member method code with example usage: obj.transform(tr) without return types