code: def display_image(self, reset=1):
          
          try:
              fb = self.server.controller.get_frame(self.frame)
          except KeyError:
              # the selected frame does not exist, create it
              fb = self.server.controller.init_frame(self.frame)
  
          if not fb.height:
              width = fb.width
              height = int(len(fb.buffer) / width)
              fb.height = height
  
              # display the image
              if (len(fb.buffer) > 0) and (height > 0):
                  self.server.controller.display(self.frame, width, height,
                                                 True)
          else:
              self.server.controller.display(self.frame, fb.width, fb.height,
                                             False)
docs: Utility routine used to display an updated frame from a framebuffer.