GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
+the Free Software Foundation, either version 3 of the License, or (at
+your option) any later version.
GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
bool (*cached_font_ok) (struct frame *f,
Lisp_Object font_object,
Lisp_Object entity);
+
+ /* Optional
+
+ Return non-nil if the driver support rendering of combining
+ characters for FONT according to Unicode combining class. */
+ Lisp_Object (*combining_capability) (struct font *font);
};