function LetterProps(o, sw, sc, fc, m, p) {
  this.o = o;
  this.sw = sw;
  this.sc = sc;
  this.fc = fc;
  this.m = m;
  this.p = p;
  this._mdf = {
    o: true,
    sw: !!sw,
    sc: !!sc,
    fc: !!fc,
    m: true,
    p: true,
  };
}

LetterProps.prototype.update = function (o, sw, sc, fc, m, p) {
  this._mdf.o = false;
  this._mdf.sw = false;
  this._mdf.sc = false;
  this._mdf.fc = false;
  this._mdf.m = false;
  this._mdf.p = false;
  var updated = false;

  if (this.o !== o) {
    this.o = o;
    this._mdf.o = true;
    updated = true;
  }
  if (this.sw !== sw) {
    this.sw = sw;
    this._mdf.sw = true;
    updated = true;
  }
  if (this.sc !== sc) {
    this.sc = sc;
    this._mdf.sc = true;
    updated = true;
  }
  if (this.fc !== fc) {
    this.fc = fc;
    this._mdf.fc = true;
    updated = true;
  }
  if (this.m !== m) {
    this.m = m;
    this._mdf.m = true;
    updated = true;
  }
  if (p.length && (this.p[0] !== p[0] || this.p[1] !== p[1] || this.p[4] !== p[4] || this.p[5] !== p[5] || this.p[12] !== p[12] || this.p[13] !== p[13])) {
    this.p = p;
    this._mdf.p = true;
    updated = true;
  }
  return updated;
};