code: def get_text_width_height_descent(self, s, prop, ismath):
      # docstring inherited
  
      if ismath == "TeX":
          return super().get_text_width_height_descent(s, prop, ismath)
  
      if ismath:
          (
              width,
              height,
              descent,
              *_,
          ) = self._text2path.mathtext_parser.parse(s, self.dpi, prop)
          return width, height, descent
  
      ctx = self.text_ctx
      # problem - scale remembers last setting and font can become
      # enormous causing program to crash
      # save/restore prevents the problem
      ctx.save()
      ctx.select_font_face(*_cairo_font_args_from_font_prop(prop))
      ctx.set_font_size(
          self.points_to_pixels(prop.get_size_in_points())
      )
  
      y_bearing, w, h = ctx.text_extents(s)[1:4]
      ctx.restore()
  
      return w, h, h + y_bearing
  
imports: import functools
  import gzip
  import math
  import numpy
  from ..None import _api, cbook, font_manager
  from matplotlib.backend_bases import _Backend, FigureCanvasBase, FigureManagerBase, GraphicsContextBase, RendererBase
  from matplotlib.font_manager import ttfFontProperty
  from matplotlib.path import Path
  from matplotlib.transforms import Affine2D
label_desc: Use image node_id 10 for calling the RendererCairo obj's underlying member method code with example usage: obj.get_text_width_height_descent(s, prop, ismath) and returns: w,  h,  unknown, super, width,  height,  descent