Method capture

packages/gl-react/src/Bus.tsx:132–135

* Capture the underlying Node pixels. * NB it only works for nodes, not for content like video/canvas.

(x?: number, y?: number, w?: number, h?: number)

   * NB it only works for nodes, not for content like video/canvas.
   */
  capture(x?: number, y?: number, w?: number, h?: number): NDArray {
    invariant(this.glNode, "Bus does not contain any Node");
    return this.glNode!.capture(x, y, w, h);
  }

  glBusRootNode: any = null;
  onRef = (ref: any) => {