code: def _render_figure(self, pixmap, width, height):
      FigureCanvasAgg.draw(self)
  
      buf = self.buffer_rgba()
      ren = self.get_renderer()
      w = int(ren.width)
      h = int(ren.height)
  
      pixbuf = gtk.gdk.pixbuf_new_from_data(
          buf, gtk.gdk.COLORSPACE_RGB, True, 8, w, h, w * 4
      )
      pixmap.draw_pixbuf(
          pixmap.new_gc(),
          pixbuf,
          0,
          0,
          0,
          0,
          w,
          h,
          gtk.gdk.RGB_DITHER_NONE,
          0,
          0,
      )
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import six
  import matplotlib
  from matplotlib.cbook import warn_deprecated
  from matplotlib.backends.backend_agg import FigureCanvasAgg
  from matplotlib.backends.backend_gtk import gtk, _BackendGTK, FigureCanvasGTK, FigureManagerGTK, NavigationToolbar2GTK, backend_version, error_msg_gtk, PIXELS_PER_INCH
  from matplotlib.backends._gtkagg import agg_to_gtk_drawable
label_desc: Use image node_id 3 for calling the FigureCanvasGTKAgg obj's underlying member method code with example usage: obj._render_figure(pixmap, width, height) without return types