code: function strokeRect(x, y, width, height) {
           if (this.backBufferContext2D.globalAlpha < 1 / 255) {
             // Fast path: don't draw fully transparent
             return;
           }
  
           this.backBufferContext2D.strokeRect(x, y, width, height);
         }
docs: Stroke a rectangle at the specified coordinates
  @name strokeRect
  @memberOf me.CanvasRenderer.prototype
  @function
  @param {Number} x
  @param {Number} y
  @param {Number} width
  @param {Number} height