最佳实践

const licenseToken = await fetch('/api/facebetter/auth', { method: 'POST' }).then((r) => r.text());
const engine = new BeautyEffectEngine(new EngineConfig({ licenseToken }));

useEffect(() => {
  let engine;
  (async () => {
    engine = new BeautyEffectEngine(new EngineConfig({ licenseToken }));
    await engine.init();
    engineRef.current = engine;
  })();
  return () => {
    engineRef.current?.destroy();
    engineRef.current = null;
  };
}, []);

const result = engine.processImage(
  video,
  video.videoWidth,
  video.videoHeight,
  FrameType.Video,
  MirrorMode.Horizontal,
);
ctx.putImageData(result, 0, 0);

function rasterize(source, maxEdge) {
  const sw = source.naturalWidth || source.width;
  const sh = source.naturalHeight || source.height;
  const scale = Math.min(1, maxEdge / Math.max(sw, sh));
  const w = Math.max(1, Math.round(sw * scale));
  const h = Math.max(1, Math.round(sh * scale));
  const canvas = document.createElement('canvas');
  canvas.width = w;
  canvas.height = h;
  const ctx = canvas.getContext('2d');
  ctx.drawImage(source, 0, 0, w, h);
  return ctx.getImageData(0, 0, w, h);
}

const preview = rasterize(image, 1440); // 打开文件时做一次，之后复用
// 原图 `image` 留给导出

const previewOut = engine.processImage(
  preview,
  preview.width,
  preview.height,
  FrameType.Image,
);
previewCtx.putImageData(previewOut, 0, 0);

// 导出：全尺寸，只跑一次
const exportOut = engine.processImage(
  image,
  image.naturalWidth,
  image.naturalHeight,
  FrameType.Image,
);