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HTMLCanvasElement: transferControlToOffscreen() メソッド - Web API | MDN
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HTMLCanvasElement: transferControlToOffscreen() メソッド
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2023年3月.
HTMLCanvasElement.transferControlToOffscreen() メソッドは、メインスレッドまたはワーカーの OffscreenCanvas オブジェクトへ制御を委譲します。
構文
js
transferControlToOffscreen()
引数
なし。
返値
OffscreenCanvas オブジェクト。
例
次の例は、メインスレッド上の OffscreenCanvas オブジェクトに制御を移譲する方法です。
js
const htmlCanvas = document.createElement("canvas");
const offscreen = htmlCanvas.transferControlToOffscreen();
const gl = offscreen.getContext("webgl");
// Some drawing using the gl context…
次の例は、ワーカー上の OffscreenCanvas オブジェクトに制御を移す方法を示しています。
js
const offscreen = document.querySelector("canvas").transferControlToOffscreen();
const worker = new Worker("myworkerurl.js");
worker.postMessage({ canvas: offscreen }, [offscreen]);
仕様書
| Specification |
|---|
| HTML # dom-canvas-transfercontroltooffscreen-dev |
ブラウザーの互換性
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関連情報
- このメソッドを定義しているインターフェイス、
HTMLCanvasElement OffscreenCanvas