pre-render

registerPaint(class {
  constructor() {
    this.otherImage = new PaintRC2D(100, 100);
    this.otherImage /\* draw commands go here */
  }

  paint(ctx, ...) {
    ctx.drawImage(this.otherImage, 0, 100);
    ctx.drawImage(this.otherImage, 0, 200);

  }
});
