HarmonyOS 加载rawfile资源图片，转换PixelMap有黑边

加载rawfile资源图片，转换PixelMap有黑边

代码如下

const resourceMgr: resourceManager.ResourceManager =
  (PHMethod.context() as common.UIAbilityContext).resourceManager;
resourceMgr.getRawFileContent(name).then((fileData: Uint8Array) => {
  console.log("Succeeded in getting RawFileContent")
  // 获取图片的ArrayBuffer
  const buffer = fileData.buffer.slice(0);
  const imageSource = image.createImageSource(buffer);
  const imagePackerApi = image.createImagePacker();
  let packOpts: image.PackingOption = { format: "image/jpeg", quality: quality||30 };
  imagePackerApi.packing(imageSource, packOpts).then(async (data: ArrayBuffer) => {
    // data 为打包获取到的文件流，写入文件保存即可得到一张图片
    if (data) {
      const imageSource: image.ImageSource = image.createImageSource(data);
      let decodingOptions: image.DecodingOptions = {
        editable: true,
        desiredPixelFormat: 3,
      }
      resolve(imageSource.createPixelMap(decodingOptions));
    }
  }).catch((error: BusinessError) => {
    console.error('Failed to pack the image. And the error is: ' + error);
  })