1. protected
Future<ImageInfo> loadAsync(AssetBundleImageKey key)

Fetches the image from the asset bundle, decodes it, and returns a corresponding ImageInfo object.

This function is used by load.

Source 

@protected
Future<ImageInfo> loadAsync(AssetBundleImageKey key) async {
  final ByteData data = await key.bundle.load(key.name);
  if (data == null)
    throw 'Unable to read data';
  final ui.Image image = await decodeImage(data);
  if (image == null)
    throw 'Unable to decode image data';
  return new ImageInfo(image: image, scale: key.scale);
}