【图片】将沙盒中的图片文件转为image.PixelMap对象

在研发过程中，需要将沙盒中的图片文件转为image.PixelMap进行二次编辑，系统没有提供直接的转换方法，需要进行二次封装，代码如下：

export function sandBoxImageToImagePixelMap(sandBoxFilePath: string): PixelMap {
  let pathUri = fileUri.getUriFromPath(sandBoxFilePath);
  const file = fileIo.openSync(pathUri);
  const imageSource: image.ImageSource = image.createImageSource(file.fd);
  fileIo.closeSync(file);
  const imageInfo: image.ImageInfo = imageSource.getImageInfoSync();
  const height = imageInfo.size.height;
  const width = imageInfo.size.width;
  const options: image.DecodingOptions = {
    editable: true,
    desiredSize: { height, width }
  };
  const pixelMap: PixelMap = imageSource.createPixelMapSync(options);
  return pixelMap;
}

使用示例如下：

let context = this.getUIContext().getHostContext() as common.UIAbilityContext;
let dir = context.filesDir;
let pngPath = dir + "/xxx.png";
let imagePixelMap = sandBoxImageToImagePixelMap(pngPath);