code: def get_canvas_width_height(self):
      # docstring inherited
      return self.width * 72.0, self.height * 72.0
  
imports: from io import BytesIO
  import functools
  from fontTools import subset
  import matplotlib
  from ..None import font_manager, ft2font
  from .._afm import AFM
  from ..backend_bases import RendererBase
label_desc: Use image node_id 5 for calling the RendererPDFPSBase obj's underlying member method code with example usage: obj.get_canvas_width_height() and returns: unknown,  unknown