<ThreadSafetyStatement>Gtk# is thread aware, but not thread safe; See the <linklocation="node:gtk-sharp/programming/threads">Gtk# Thread Programming</link> for details.</ThreadSafetyStatement>
<summary>This will be called whenever new fonts are created.</summary>
<remarks>If the function returns a <seecref="T:Pango.FcDecoder"/>, that decoder will be used to determine both coverage via a <seecref="T:Pango.FcCharSet"/> and a one-to-one mapping of characters to glyphs. This will allow applications to have application-specific encodings for various fonts.</remarks>