virtual void draw_surface_part(const DrawingRequest& request) = 0;
virtual void draw_gradient(const DrawingRequest& request) = 0;
virtual void draw_filled_rect(const DrawingRequest& request) = 0;
+ virtual void draw_inverse_ellipse(const DrawingRequest& request) = 0;
virtual void get_light(const DrawingRequest& request) const = 0;
};