# File lib/RMagick.rb, line 939
    def matte_floodfill(x, y)
        f = copy
        f.opacity = OpaqueOpacity unless f.matte
        target = f.pixel_color(x, y)
        f.matte_flood_fill(target, TransparentOpacity,
                           x, y, FloodfillMethod)
    end