class Magick::RVG

def bgfill()

else, combine it with the background_fill_opacity.
background_fill defaults to 'none'. If background_fill has been set to something

def bgfill()
    if @background_fill.nil?
        color = Magick::Pixel.new(0,0,0,Magick::TransparentOpacity)
    else
        color = @background_fill
        color.opacity = (1.0 - @background_fill_opacity) * Magick::TransparentOpacity
    end
    return color
end