gtk:snapshot-append-color (snapshot color bounds)

snapshot -- a gtk:snapshot object
color -- a gdk:rgba instance for the color to draw
bounds -- a graphene:rect-t instance for the bounds of the node

Creates a new render node drawing the color into the given bounds and appends it to the current render node of snapshot. You should try to avoid calling this function if color is transparent. This is an example of a snapshot method for a user defined "ColorSwatch" subclass that calls this function:

(defmethod color-swatch-snapshot-impl ((swatch color-swatch) snapshot)
  (let ((width (gtk:widget-width swatch))
        (height (gtk:widget-height swatch))
        (color (color-swatch-color swatch)))
    (graphene:with-rect (bounds 0 0 width height)
      (gtk:snapshot-append-color snapshot color bounds))))