# File gtk/sample/gtk-demo/cairo-clip-image.rb, line 19
    def draw(cr)
      cr.save do
        cr.arc(0.5, 0.5, 0.4, 0, 2 * Math::PI)
        cr.clip
        
        cr.new_path
        
        loader = Gdk::PixbufLoader.new
        File.open("background.jpg", "rb") do |f|
          loader.last_write(f.read)
        end
        pixbuf = loader.pixbuf
        cr.scale(1.0 / pixbuf.width, 1.0 / pixbuf.height)
        
        cr.set_source_pixbuf(pixbuf, 0, 0)
        cr.paint
      end

      cr.save do
        cr.arc(0.5, 0.5, 0.3, 0, 2 * Math::PI)
        cr.clip
        
        cr.new_path
        
        image = Cairo::ImageSurface.from_png("ruby-gnome2-logo.png")
        cr.scale(1.0 / image.width, 1.0 / image.height)
        
        cr.set_source(image, 0, 0)
        cr.paint
      end
    end