code: def render_image(self, rgbobj, dst_x, dst_y):
          
          pos = (0, 0)
          arr = self.viewer.getwin_array(order=self.rgb_order, alpha=1.0,
                                         dtype=np.uint8)
          #pos = (dst_x, dst_y)
          #print('dst', pos)
          #pos = self.tform['window_to_native'].to_(pos)
          #print('dst(c)', pos)
          self.gl_set_image(arr, pos)
docs: Render the image represented by (rgbobj) at dst_x, dst_y
          in the pixel space.