Attaches a key/value pair as an option to a #GdkPixbuf. If @key already exists in the list of options attached to @pixbuf, the new value is ignored and %FALSE is returned.
a nul-terminated string.
Return: %TRUE on success.
2.2
See Implementation
Attaches a key/value pair as an option to a #GdkPixbuf. If @key already exists in the list of options attached to @pixbuf, the new value is ignored and %FALSE is returned.