code: function(pixel, current) {
          var bounds = this.getBoundsNoRotate(current);
          return pixel.minus(
              new $.Point(this._margins.left, this._margins.top)
          ).divide(
              this._containerInnerSize.x / bounds.width
          ).plus(
              bounds.getTopLeft()
          );
      }
docs: Convert pixel coordinates to viewport coordinates.
  This method does not take rotation into account.
  Consider using pointFromPixel if you need to account for rotation.
  @param {OpenSeadragon.Point} pixel Pixel coordinates
  @param {Boolean} [current=false] - Pass true for the current location;
  defaults to false (target location).
  @returns {OpenSeadragon.Point}