From: "Perry E. Metzger" <perry@piermont.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: deng@randomsample.de, emacs-devel@gnu.org
Subject: Re: Speed of keyboard macro execution?
Date: Thu, 10 Dec 2015 13:10:37 -0500 [thread overview]
Message-ID: <20151210131037.7ab4ae05@jabberwock.cb.piermont.com> (raw)
In-Reply-To: <83lh929omw.fsf@gnu.org>
On Thu, 10 Dec 2015 19:53:11 +0200 Eli Zaretskii <eliz@gnu.org> wrote:
> This I can explain. "Redisplay" comes into play not only for
> actually redrawing the screen, it also comes into play when, e.g.,
> a command moves cursor down, as in C-n. With (the default)
> line-move-visual mode, Emacs no longer has an easy way of knowing
> what character is directly below the current one, what with all the
> variable-pitch fonts and long lines broken between several screen
> lines. The only way of finding out where is "one visual line down"
> is to _simulate_ redisplay. IOW, Emacs runs code that does exactly
> what redisplay does, but without displaying anything; it just
> accumulates pixel coordinates until it finds itself one visual line
> down.
Oh, my. Now I understand. Especially once you have issues like (as
just one example) complicated Unicode rendering involved, this could
get arbitrarily messy.
I suppose there are only two obvious ways to handle that:
1) radically speed up the redisplay code.
2) memoize the output of the redisplay code.
Have I missed an obvious approach or are those the choices?
Perry
--
Perry E. Metzger perry@piermont.com
next prev parent reply other threads:[~2015-12-10 18:10 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-09 21:39 Speed of keyboard macro execution? Perry E. Metzger
2015-12-09 22:13 ` David Engster
2015-12-09 23:03 ` Perry E. Metzger
2015-12-10 16:43 ` Eli Zaretskii
2015-12-10 17:00 ` Perry E. Metzger
2015-12-10 17:14 ` John Wiegley
2015-12-10 17:27 ` David Engster
2015-12-10 17:33 ` Perry E. Metzger
2015-12-10 17:39 ` David Engster
2015-12-10 17:53 ` Eli Zaretskii
2015-12-10 18:10 ` Perry E. Metzger [this message]
2015-12-10 18:41 ` Eli Zaretskii
2015-12-10 18:44 ` David Kastrup
2015-12-10 18:57 ` Eli Zaretskii
2015-12-10 19:38 ` David Kastrup
2015-12-10 20:00 ` Eli Zaretskii
2015-12-10 20:09 ` David Kastrup
2015-12-10 20:43 ` Eli Zaretskii
2015-12-10 20:55 ` David Kastrup
2015-12-10 20:16 ` Perry E. Metzger
2015-12-10 20:18 ` John Wiegley
2015-12-10 20:36 ` David Kastrup
2015-12-10 20:43 ` John Wiegley
2015-12-10 21:01 ` David Kastrup
2015-12-10 21:26 ` John Wiegley
2015-12-10 23:35 ` David Kastrup
2015-12-11 1:14 ` John Wiegley
2015-12-11 6:27 ` David Kastrup
2015-12-12 22:56 ` John Wiegley
2015-12-12 23:46 ` David Kastrup
2015-12-13 0:16 ` John Wiegley
2015-12-13 0:32 ` David Kastrup
2015-12-12 23:20 ` Per Starbäck
2015-12-12 16:51 ` Perry E. Metzger
2015-12-12 17:42 ` David Kastrup
2015-12-12 23:01 ` Disabling visual lines for macros (was: Speed of keyboard macro execution?) John Wiegley
2015-12-12 23:33 ` Disabling visual lines for macros David Kastrup
2015-12-10 20:45 ` Speed of keyboard macro execution? Perry E. Metzger
2015-12-10 20:50 ` John Wiegley
2015-12-10 20:48 ` Eli Zaretskii
2015-12-10 20:50 ` John Wiegley
2015-12-10 21:13 ` David Kastrup
2015-12-10 17:37 ` Eli Zaretskii
2015-12-10 17:43 ` John Wiegley
2015-12-10 17:54 ` Eli Zaretskii
2015-12-10 18:15 ` Achim Gratz
2015-12-10 18:47 ` Eli Zaretskii
2015-12-12 2:14 ` Joseph Mingrone
2015-12-12 7:39 ` Eli Zaretskii
2015-12-12 17:28 ` Joseph Mingrone
2015-12-12 17:57 ` Eli Zaretskii
2015-12-12 18:12 ` Joseph Mingrone
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