_getColor(color, viewFontSize, initialStrokeColor) {
    let fontColor = color || "#000000";
    let strokeColor = initialStrokeColor || "#ffffff";
    if (viewFontSize <= this.elementOptions.scaling.label.drawThreshold) {
      const opacity = Math.max(
        0,
        Math.min(
          1,
          1 - (this.elementOptions.scaling.label.drawThreshold - viewFontSize)
        )
      );
      fontColor = overrideOpacity(fontColor, opacity);
      strokeColor = overrideOpacity(strokeColor, opacity);
    }
    return [fontColor, strokeColor];
  }
fade in when relative scale is between threshold and threshold - 1.
If the relative scale would be smaller than threshold -1 the draw function would have returned before coming here.
@param {string} color  The font color to use
@param {number} viewFontSize
@param {string} initialStrokeColor
@returns {Array.<string>} An array containing the font color and stroke color
@private