setCharacter(char) {
    // Check if the pen is out of bounds.
    if (!this.isPenInBounds_()) {
      return;
    }

    const cea708Char = new shaka.cea.CeaUtils.StyledChar(
        char, this.underline_, this.italics_,
        this.backgroundColor_, this.textColor_);
    this.memory_[this.row_][this.col_] = cea708Char;

    // Increment column
    this.col_ ++;
  }
Sets the unicode value for a char at the current pen location.
@param {string} char