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From: YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp>
To: Jason Rumney <jasonr@gnu.org>
Cc: Chong Yidong <cyd@stupidchicken.com>, emacs-devel@gnu.org
Subject: Re: Analysis of redisplay performance on Windows
Date: Mon, 28 Jul 2008 13:24:47 +0900	[thread overview]
Message-ID: <wlhcaaab5c.wl%mituharu@math.s.chiba-u.ac.jp> (raw)
In-Reply-To: <488CEE6B.6020600@gnu.org>

>>>>> On Sun, 27 Jul 2008 22:53:47 +0100, Jason Rumney <jasonr@gnu.org> said:

> One difference between Emacs 22 and 23 is that we compute glyph
> indexes properly in Emacs 23, while on 22 we use unicode code
> points. Since we call font->encode_char once per character rather
> than for a whole run, the overhead of selecting fonts into the GC is
> multiplied.

According to the document below, Uniscribe seems to provide some
mechanism to defer heavy operations such as get_frame_dc and
SelectObject.

  http://www.microsoft.com/typography/developers/uniscribe/uniscribe.htm#SCRIPT_CACHE

I'm not sure if this retrying with E_PENDING solves the performance
problem on Windows with Uniscribe.  But I think it's worth trying
before resorting to platform-independent changes because the
performance problem is not found so far in other platforms including
my local Core Text font-backend driver mentioned in
http://lists.gnu.org/archive/html/emacs-devel/2008-02/msg02186.html.

				     YAMAMOTO Mitsuharu
				mituharu@math.s.chiba-u.ac.jp




  parent reply	other threads:[~2008-07-28  4:24 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-07-27  3:07 Analysis of redisplay performance on Windows Chong Yidong
2008-07-27  9:55 ` Jason Rumney
2008-07-27 20:56   ` Chong Yidong
2008-07-27 21:30     ` Jason Rumney
2008-07-27 21:40       ` Chong Yidong
2008-07-27 21:53         ` Jason Rumney
2008-07-28  1:18           ` Chong Yidong
2008-07-28  3:06             ` Adrian Robert
2008-07-28  5:03               ` Chong Yidong
2008-07-28  7:04             ` Jason Rumney
2008-07-28  2:11           ` Kevin Yu
2008-07-28  4:24           ` YAMAMOTO Mitsuharu [this message]
2008-07-28  9:48             ` YAMAMOTO Mitsuharu
2008-07-30 21:51               ` Jason Rumney

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