void draw(float x, float y, float alpha, DrawingEffect effect) const;
void draw_part(float src_x, float src_y, float dst_x, float dst_y,
float width, float height,
void draw(float x, float y, float alpha, DrawingEffect effect) const;
void draw_part(float src_x, float src_y, float dst_x, float dst_y,
float width, float height,