gchar* gdk_rgba_to_string ( const GdkRGBA* rgba )
Returns a textual specification of
rgba in the form
where “r”, “g”, “b” and “a” represent the red, green,
blue and alpha values respectively. “r”, “g”, and “b” are
represented as integers in the range 0 to 255, and “a”
is represented as a floating point value in the range 0 to 1.
These string forms are string forms that are supported by the CSS3 colors module, and can be parsed by gdk_rgba_parse().
Note that this string representation may lose some precision, since “r”, “g” and “b” are represented as 8-bit integers. If this is a concern, you should use a different representation.