function Rgb(r, g, b) {
      if (r === void 0) {
        r = 255;
      }
      if (g === void 0) {
        g = 255;
      }
      if (b === void 0) {
        b = 255;
      }
      this.r = r;
      this.g = g;
      this.b = b;
    }
Gets the current frames per second (FPS) setting.
@returns {number|string} The current FPS setting. Returns "auto" if set to default, or a number representing the specific FPS.