static withoutClamping(r, g, b, a) {
    var rgba = new RGBA(0, 0, 0, 0);
    rgba.r = r;
    rgba.g = g;
    rgba.b = b;
    rgba.a = a;
    return rgba;
  }
Return an `RGBA` without clamping values.

@param {Number} r
@param {Number} g
@param {Number} b
@param {Number} a
@return {RGBA}
@api public