gdk-pixbuf-fill (pixbuf pixel)

pixbuf -- a gdk-pixbuf object
pixel -- an unsigned integer with the RGBA pixel to clear to, #xffffffff is opaque white, #x00000000 transparent black

Clears a pixbuf to the given RGBA value, converting the RGBA value into the pixel format of the pixbuf. The alpha will be ignored if the pixbuf does not have an alpha channel.