Re: Tick Reduction

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Sat, 20 Nov 2021 09:43:34 +0100
> Cc: Emacs developers <emacs-devel@gnu.org>, Dmitry Gutov <dgutov@yandex.ru>
> 
> > Does harfbuzz, or something else, provide us with a way to know the
> > x-height of a character?
> 
> I've poked around briefly, and I don't see anything likely.  fc-query
> doesn't say anything about x-height either.  Anybody else know?

Emacs knows that for each character it displays.  (Assuming I
understand what "x-height of a character" means in this context.)  We
get the full metrics of the character from the font, and use that for
layout.