@Override
  public @Nullable CloseableReference<Bitmap> getPreDecodedFrame(int frameNumber) {
    return mAnimatedImageResult.getDecodedFrame(frameNumber);
  }
An {@link AnimatedDrawableBackend} that renders {@link AnimatedImage}.
animated-base/src/main/java/com/facebook/imagepipeline/animated/impl/AnimatedDrawableBackendImpl.java