HarmonyOS 执行PixelMap进行保存

demo如下:

export async  function savePixelMapV2(context: Context, pixelMap: PixelMap,width: number, height: number):Promise<string> {
  if (pixelMap === null) {
    console.error('传入的pm为空');
    return '';
  }
  const imagePackerApi: image.ImagePacker = image.createImagePacker();
  const path: string = context.cacheDir + '/' + getTimeStr() + '.jpg';
  const packOpts: image.PackingOption = { format: 'image/jpeg', quality: 100 };
  let file = fs.openSync(path, fs.OpenMode.CREATE | fs.OpenMode.READ_WRITE);
  console.log('path:'+path+"--file:"+file.fd)

  //该三个参数测试固定为16:9，建议封装调用
  const cropWidth = width;
  const cropHeight = Math.floor(width * (CommonConstants.CROP_RATE_9_16));
  const cropPosition = new RegionItem(0, Math.floor((height - cropHeight) / CommonConstants.AVERAGE_WEIGHT_WIDTH));

  //裁切后打包
  return  pixelMap.crop({
    size: {
      width: cropWidth,
      height: cropHeight
    },
    x: cropPosition.x,
    y: cropPosition.y
  }).then(() => {
    console.info('Sucessed in cropping pixelmap.');
    imagePackerApi.packToFile(pixelMap, file.fd, packOpts)
      .then(() => {
        console.info('Succeeded in packToFile.');
        //直接打包进文件
        fs.closeSync(file.fd);
        console.debug("path_:" + path)
        return ''
      }).catch((error : BusinessError) => {
      console.error('Failed to packToFile.');
      return ''
    })
    return '';
  }).catch((err : BusinessError) => {
    console.error('Failed to crop pixelmap.');
    return ''
  });
}