class UnifiedDisplay { constructor(width, height) { this.canvas = new OffscreenCanvas(width, height); this.ctx = this.canvas.getContext('2d'); this.htmlRenderer = null; this.videoRenderer = null; } render() { // HTML部分を描画 if (this.htmlRenderer) { this.htmlRenderer.draw(this.ctx, 0, 0); } // 動画部分を描画 if (this.videoRenderer) { this.videoRenderer.draw(this.ctx, 0, 200); } } }