/**
   * Returns the focal point value (in pixels) relative to the original image.
   *
   * @param \Drupal\crop\CropInterface $crop
   *   The crop object used to define the crop.
   * @param \Drupal\focal_point\FocalPointManager $focal_point_manager
   *   The focal point manager.
   *
   * @return array
   *   An array with the keys 'x' and 'y'. Values are in pixels.
   */
  protected function getOriginalFocalPoint(CropInterface $crop, FocalPointManager $focal_point_manager) {
    $focal_point = $crop->position();

    // Check if we are generating a preview image. If so get the focal point
    // from the query parameter, otherwise use the crop position.
    $preview_value = $this->getPreviewValue();
    if (!is_null($preview_value)) {
      // @todo: should we check that preview_value is valid here? If it's invalid it gets converted to 0,0.
      $original_image_size = $this->getOriginalImageSize();
      list($x, $y) = explode('x', $preview_value);
      $focal_point = $focal_point_manager->relativeToAbsolute($x, $y, $original_image_size['width'], $original_image_size['height']);
    }

    return $focal_point;
  }