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;
};