@Override
  public Matrix getTransform() {
    return mActiveTransform;
  }
Gets the matrix that transforms image-absolute coordinates to view-absolute coordinates. The
zoomable transformation is taken into account.

<p>Internal matrix is exposed for performance reasons and is not to be modified by the callers.
samples/zoomable/src/main/java/com/facebook/samples/zoomable/DefaultZoomableController.java