Re: How to get the actual face attribute?

[Eli Zaretskii]

> From: Yuan Fu <casouri@gmail.com>
> Date: Sun, 21 Jun 2020 10:55:38 -0400
> Cc: help-gnu-emacs@gnu.org
> 
> >> When writing my package I need to get height of the face at point. But 
> >> `face-attribute` doesn’t take face remapping into account, which gives 
> >> wrong answers. Is there a reliable way to get the actual face attribute 
> >> that’s used for display? Thanks.
> > 
> > From Lisp or from C?
> 
> From Lisp.

You could try calling vertical-motion to move past that line, then use
posn-at-point in the position where you arrived to see how many pixels
you moved.  (Completely untested.)