PangoCairoFontMap object of the type suitable
to be used with cairo font backend of type fonttype.pangoCairoFontMapNewForFontType(fonttype)fonttypeCairoFontType] desired CairoFontTypePangoFontMap]
or NULL if the requested cairo font backend is
not supported / compiled in.pangoCairoFontMapNew,
or in fact in most of those cases, just use
@pangoCairoFontMapGetDefault.
Since 1.18