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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Question about display engine
Date: Thu, 08 Aug 2019 20:38:55 +0300
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To: Ergus <spacibba@aol.com>
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> Date: Thu, 8 Aug 2019 10:38:04 +0200
> From: Ergus <spacibba@aol.com>
> Cc: Eli Zaretskii <eliz@gnu.org>, emacs-devel@gnu.org
> 
> Looking at the merge_face function could anyone please explain better
> what means: realized face and lface_id and please direct me to where is
> documented how emacs uses the faces internally; the functionalities
> available and specially the merge rules?

You need to read xfaces.c, the code is all there.  Feel free to ask
questions if the code doesn't speak for itself.