c_gdk_pixbuf_add_alpha

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
GdkPixbuf* function(GdkPixbuf* pixbuf, gboolean substituteColor, guchar r, guchar g, guchar b) c_gdk_pixbuf_add_alpha;

Meta