HarmonyOS Uint8Array怎么正确转ArrayBuffer

private setImageData(imageData: Uint8Array) { 
  const buffer = imageData.buffer; 
  let imageSource = image.createImageSource(buffer); 
  let decodingOptions: image.DecodingOptions = { 
    editable: false, // 是否可编辑 
    desiredPixelFormat: image.PixelMapFormat.RGBA_8888, // 期望像素格式，水印有透明的部份所以只能rgba 
  }; 
  imageSource?.createPixelMap(decodingOptions).then((pixelMap) => { 
    this.imageResource = pixelMap; 
    this.update(); 
  }); 
}