docs: private boolean canScrollInAllDirection() {
      return mTransformedImageBounds.left < mViewBounds.left - EPS &&
          mTransformedImageBounds.top < mViewBounds.top - EPS &&
          mTransformedImageBounds.right > mViewBounds.right + EPS &&
          mTransformedImageBounds.bottom > mViewBounds.bottom + EPS;
    }