Function: lgstring-header
lgstring-header is a byte-compiled function defined in
composite.el.gz.
Signature
(lgstring-header GSTRING)
Source Code
;; Defined in /usr/src/emacs/lisp/composite.el.gz
;;; Automatic character composition.
;; These macros must match with C macros LGSTRING_XXX and LGLYPH_XXX in font.h
(defsubst lgstring-header (gstring) (aref gstring 0))