HarmonyOS Image大图使用了.blur会有性能问题，请提供平替方案

参考demo：

async aboutToAppear(): Promise<void> {
  let OutData: http.HttpResponse
  http.createHttp().request("http:myURL.jpg",
  (error: BusinessError, data: http.HttpResponse) => {
  if (error) {
    console.error(`http reqeust failed with. Code: ${error.code}, message: ${error.message}`);
  } else {
  OutData = data
  let code: http.ResponseCode | number = OutData.responseCode
  if (http.ResponseCode.OK === code) {
  let imageData: ArrayBuffer = OutData.result as ArrayBuffer;
  let imageSource = image.createImageSource(imageData.slice(0));
  imageSource.createPixelMap().then(async pixelMap => {
  let radius = 15;
  let headFilter = effectKit.createEffect(pixelMap);
  if (headFilter != null) {
  headFilter.blur(radius);
}
this.img = await headFilter.getEffectPixelMap();
})
}
}