HarmonyOS imagePacker不支持编码成jpg格式

async packing(sourcePixelMap: image.PixelMap, imageQuality: number): Promise<ArrayBuffer> { 
  const imagePackerApi = image.createImagePacker(); 
  const packOpts: image.PackingOption = { format: "image/jpeg", quality: imageQuality }; 
  const data: ArrayBuffer = await imagePackerApi.packing(sourcePixelMap, packOpts); 
  return data; 
} 
async saveImageToFile(image: image.PixelMap) : Promise<void>{ 
  const IMAGE_QUALITY = 90; 
  let compressedImageData: ArrayBuffer = await this.packing(image, IMAGE_QUALITY); 
  let context: Context = getContext(); 
  let compressedImageUri: string = context.filesDir + '/' + 'dumpImage.jpg'; 
  try { 
  let res = fs.accessSync(compressedImageUri); 
  if (res) { 
    fs.unlinkSync(compressedImageUri); 
  } 
} catch (err) { 
  console.error(TAG, `AccessSync failed with error message: ${err.message}, error code: ${err.code}`); 
} 
let file: fs.File = fs.openSync(compressedImageUri, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE); 
fs.writeSync(file.fd, compressedImageData); 
fs.closeSync(file); 
}