Attaches a key/value pair as an option to a gdkpixbuf.pixbuf.Pixbuf.
If key already exists in the list of options attached to the pixbuf, the new value is ignored and FALSE is returned.
a nul-terminated string.
TRUE on success
Attaches a key/value pair as an option to a gdkpixbuf.pixbuf.Pixbuf.
If key already exists in the list of options attached to the pixbuf, the new value is ignored and FALSE is returned.