enableGSUB method

dynamic enableGSUB(dynamic featureNumber)

Implementation

enableGSUB(featureNumber) {
  if (this.GSUB) {
    var feature = this.GSUB.featureList[featureNumber];
    if (feature) {
      for (var i = 0; i < feature.tab.length; ++i) {
        this.enabledGSUB[feature.tab[i]] =
            (this.enabledGSUB[feature.tab[i]] ?? 0) + 1;
      }
    }
  }
}