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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Aborting display.  Is this possible?
Date: Mon, 20 Oct 2014 05:45:15 +0300
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References: <20141019141712.GB3197@acm.acm> <83lhoccdv7.fsf@gnu.org>
	<20141019154255.GC3197@acm.acm>
	<jwvd29ncxsy.fsf-monnier+emacs@gnu.org>
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Cc: acm@muc.de, emacs-devel@gnu.org
To: Stefan Monnier <monnier@iro.umontreal.ca>
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: Eli Zaretskii <eliz@gnu.org>,  emacs-devel@gnu.org
> Date: Sun, 19 Oct 2014 21:59:09 -0400
> 
> I.e. drawing does not start until the glyph matrix is fully computed.

Where "fully computed" might mean only some portions of it are
actually computed and "enabled for redisplay", if Emacs can determine
that the rest doesn't need any update.