@VisibleForTesting
  public synchronized @Nullable SharedReference<PooledByteBuffer> getUnderlyingReferenceTestOnly() {
    return (mPooledByteBufferRef != null)
        ? mPooledByteBufferRef.getUnderlyingReferenceTestOnly()
        : null;
  }
A test-only method to get the underlying references.

<p><b>DO NOT USE in application code.</b>
imagepipeline-base/src/main/java/com/facebook/imagepipeline/image/EncodedImage.java