resetPen() {
    this.row_ = 0;
    this.col_ = 0;
    this.underline_ = false;
    this.italics_ = false;
    this.textColor_ = shaka.cea.CeaUtils.DEFAULT_TXT_COLOR;
    this.backgroundColor_ = shaka.cea.CeaUtils.DEFAULT_BG_COLOR;
  }
Reset the pen to 0,0 with default styling.