code: func (c RGBA) RGBA() (r, g, b, a uint32) {
  	r = uint32(0xffff * c.R)
  	g = uint32(0xffff * c.G)
  	b = uint32(0xffff * c.B)
  	a = uint32(0xffff * c.A)
  	return
  }
docs: // RGBA returns alpha-premultiplied red, green, blue and alpha components of the RGBA color.