code: def set(self, point):
          
          if not isinstance(point, Point):
              point = Point(point)
  
          rx = self.round(point.x)
          ry = self.round(point.y)
  
          item = Point((rx >> 1, min(ry >> 2, self.size.y)))
          self.screen[item] |= self.pixels[ry & 3][rx & 1]
docs: Set pixel at (x, y) point.