From: Eli Zaretskii <eliz@gnu.org>
To: "Jan Djärv" <jan.h.d@swipnet.se>
Cc: mituharu@math.s.chiba-u.ac.jp, emacs-devel@gnu.org
Subject: Re: Display performance degradation
Date: Sat, 02 Jan 2010 13:21:59 +0200 [thread overview]
Message-ID: <83oclceoq0.fsf@gnu.org> (raw)
In-Reply-To: <4B3F2868.5030404@swipnet.se>
> Date: Sat, 02 Jan 2010 12:05:12 +0100
> From: Jan_Djärv <jan.h.d@swipnet.se>
> Cc: mituharu@math.s.chiba-u.ac.jp, emacs-devel@gnu.org
>
> It seems to me that lookup_named_face always merges the face with
> the default face.
Well, it must, mustn't it? A face specification does not need to be
complete; it is expected that the unspecified attributes are inherited
from the default face.
The initial issue was why lookup_named_face is at all called, if no
faces were encountered while scanning buffer text to be displayed.
But I think I know the answer: Emacs needs a fully specified face to
look it up in the face cache. Technically, this is because the cache
lookup is by face attributes, but there's probably a deeper reason
for this design.
Anyway, is the call to lookup_named_face expensive, for all the calls
but the first one which use the same face symbol? If it is cheap,
then perhaps this is a non-issue.
next prev parent reply other threads:[~2010-01-02 11:21 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-17 2:49 Display performance degradation YAMAMOTO Mitsuharu
2009-12-17 7:39 ` Jan D.
2009-12-17 20:08 ` Eli Zaretskii
2009-12-18 16:47 ` Jan Djärv
2009-12-18 21:20 ` Eli Zaretskii
2010-01-02 11:05 ` Jan Djärv
2010-01-02 11:21 ` Eli Zaretskii [this message]
2010-01-02 14:31 ` Jan Djärv
2009-12-17 12:24 ` Kenichi Handa
2009-12-17 14:43 ` Chong Yidong
2009-12-18 3:53 ` Miles Bader
2009-12-17 16:42 ` Jan Djärv
2009-12-18 3:06 ` YAMAMOTO Mitsuharu
2009-12-18 5:46 ` Kenichi Handa
2009-12-19 2:56 ` YAMAMOTO Mitsuharu
2009-12-19 10:00 ` Andreas Schwab
2009-12-20 6:27 ` YAMAMOTO Mitsuharu
2009-12-21 1:17 ` Kenichi Handa
2009-12-21 2:11 ` Miles Bader
2009-12-21 2:31 ` Lennart Borgman
2009-12-21 3:05 ` Miles Bader
2009-12-21 3:08 ` Lennart Borgman
2009-12-21 3:44 ` Miles Bader
2009-12-21 3:54 ` Lennart Borgman
2009-12-21 4:16 ` Miles Bader
2009-12-21 4:18 ` Lennart Borgman
2010-01-06 19:46 ` Jan Djärv
2010-01-07 8:26 ` YAMAMOTO Mitsuharu
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