From: grischka <grishka@gmx.de>
To: Eli Zaretskii <eliz@gnu.org>
Cc: emacs-devel@gnu.org
Subject: Re: redisplay system of emacs
Date: Tue, 16 Feb 2010 21:56:03 +0100 [thread overview]
Message-ID: <4B7B0663.1050202@gmx.de> (raw)
In-Reply-To: <83hbphx86n.fsf@gnu.org>
Eli Zaretskii wrote:
>> It's not _that_complicated. Basically it just draws the new screen to
>> memory, then compares it with the current screen and then updates the
>> differences.
>
> That's only a small part of the story. It draws only part of the
> screen, not all of it (unless optimizations fail), and it goes to
> great lengths to minimize that part of the screen.
Sure, thats what I wrote: It updates only the differences.
> The reason is that delivering to the screen is not the heaviest part
> of the redisplay; it's that ``drawing to memory'' that is.
That is probably true nowadays with fast graphical screens (say for PCs
after ~1995). However the design of emacs' "redisplay" is based on the
contrary assumption that sending the updates to the terminal more expensive
than their calculation. If you want to it is optimized for _very_ slow
terminals to the expense of code simplicity. I assume it was working great
with 14400 baud connections, but then again emacs didn't have colors and
var-pitch fonts at that times, either.
--- grischka
next prev parent reply other threads:[~2010-02-16 20:56 UTC|newest]
Thread overview: 162+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-28 0:19 redisplay system of emacs alin.s
2010-01-28 4:13 ` Eli Zaretskii
2010-01-28 9:07 ` Lennart Borgman
2010-01-28 11:27 ` Eli Zaretskii
2010-01-28 11:47 ` Lennart Borgman
2010-01-28 12:43 ` Eli Zaretskii
2010-01-28 12:53 ` Lennart Borgman
2010-01-28 14:10 ` Miles Bader
2010-01-28 15:04 ` alin.s
2010-01-28 22:34 ` Lennart Borgman
2010-01-29 10:04 ` Paul R
2010-01-29 10:17 ` David Kastrup
2010-01-29 10:23 ` Lennart Borgman
2010-01-29 10:30 ` David Kastrup
2010-01-29 13:18 ` Lennart Borgman
2010-01-29 11:03 ` Miles Bader
2010-01-29 11:38 ` Eli Zaretskii
2010-01-29 15:10 ` Miles Bader
2010-01-29 17:30 ` Eli Zaretskii
2010-01-29 10:48 ` Paul R
2010-01-29 11:01 ` David Kastrup
2010-01-29 18:19 ` Stefan Monnier
2010-01-29 11:35 ` Eli Zaretskii
2010-01-29 13:06 ` Paul R
2010-01-29 13:10 ` David Kastrup
2010-01-29 13:45 ` Eli Zaretskii
2010-01-29 15:28 ` Chong Yidong
2010-01-29 18:35 ` Stefan Monnier
2010-01-29 18:56 ` Óscar Fuentes
2010-01-30 11:46 ` Richard Stallman
2010-01-30 12:51 ` Óscar Fuentes
2010-01-30 15:39 ` Eli Zaretskii
2010-01-30 19:21 ` Óscar Fuentes
2010-01-30 21:31 ` Eli Zaretskii
2010-01-31 9:32 ` David Kastrup
2010-01-31 12:41 ` Richard Stallman
2010-01-29 19:53 ` Eli Zaretskii
2010-01-30 18:04 ` Stefan Monnier
2010-01-30 18:39 ` Stephen J. Turnbull
2010-01-30 10:34 ` Fabian Ezequiel Gallina
2010-01-30 10:52 ` David Kastrup
2010-01-30 21:18 ` Stefan Monnier
2010-01-29 13:07 ` David Kastrup
2010-01-28 5:10 ` Ken Hori
2010-01-28 12:10 ` Stephen J. Turnbull
2010-01-28 13:41 ` alin.s
2010-01-28 14:50 ` Stephen J. Turnbull
2010-02-12 8:31 ` alin.s
2010-02-12 12:10 ` Juanma Barranquero
2010-02-12 13:41 ` alin.s
2010-02-12 12:49 ` Jan Djärv
2010-02-12 13:30 ` alin.s
2010-02-12 14:25 ` Jan Djärv
2010-02-12 14:37 ` alin.s
2010-02-12 14:53 ` alin.s
2010-02-12 15:11 ` Jan Djärv
2010-02-12 15:31 ` David Kastrup
2010-02-12 15:55 ` Jan Djärv
2010-02-12 16:53 ` alin.s
2010-02-12 18:55 ` David Kastrup
2010-02-14 19:13 ` alin.s
2010-02-17 13:14 ` Chong Yidong
2010-02-23 0:45 ` Giuseppe Scrivano
2010-02-23 3:01 ` David Reitter
2010-02-23 3:34 ` Tom Tromey
2010-02-23 14:31 ` Richard Stallman
2010-03-05 22:53 ` Concurrency (was: redisplay system of emacs) Stefan Monnier
2010-03-05 22:57 ` Andreas Schwab
2010-03-11 14:18 ` Giuseppe Scrivano
2010-03-25 16:49 ` Giuseppe Scrivano
2010-03-26 17:10 ` Concurrency Ted Zlatanov
2010-03-26 19:37 ` Concurrency Tom Tromey
2010-03-27 3:00 ` Concurrency Ted Zlatanov
2010-03-27 13:33 ` Concurrency Stefan Monnier
2010-03-29 18:18 ` Concurrency Tom Tromey
2010-03-28 19:40 ` Concurrency Tom Tromey
2010-03-28 20:03 ` Concurrency Stefan Monnier
2010-03-28 20:25 ` Concurrency Davis Herring
2010-03-28 20:54 ` Concurrency Giuseppe Scrivano
2010-03-28 23:18 ` Concurrency Stefan Monnier
2010-03-29 10:04 ` Concurrency Giuseppe Scrivano
2010-03-29 15:37 ` Concurrency Tom Tromey
2010-03-29 16:16 ` Concurrency Stefan Monnier
2010-03-29 16:36 ` Concurrency Ken Raeburn
2010-03-29 17:41 ` Concurrency Stefan Monnier
2010-03-29 16:33 ` Concurrency Ken Raeburn
2010-03-29 16:58 ` Concurrency Tom Tromey
2010-03-29 17:46 ` Concurrency Stefan Monnier
2010-03-29 17:37 ` Concurrency Giuseppe Scrivano
2010-03-29 18:21 ` Concurrency Stefan Monnier
2010-03-28 21:19 ` Concurrency Tom Tromey
2010-03-28 21:22 ` Concurrency Daniel Colascione
2010-03-28 23:20 ` Concurrency Stefan Monnier
2010-03-29 2:18 ` Concurrency Tom Tromey
2010-03-28 21:17 ` Concurrency Tom Tromey
2010-03-29 16:25 ` Concurrency Ken Raeburn
2010-03-29 16:49 ` Concurrency Tom Tromey
2010-03-29 17:39 ` Concurrency Stefan Monnier
2010-03-31 17:13 ` gsoc for concurrent Emacs? (was: Concurrency) Ted Zlatanov
2010-04-01 9:45 ` Giuseppe Scrivano
2010-03-28 21:04 ` Concurrency Giuseppe Scrivano
2010-03-28 21:25 ` Concurrency Daniel Colascione
2010-03-29 2:20 ` Concurrency Tom Tromey
2010-02-14 19:25 ` redisplay system of emacs alin.s
2010-02-16 16:40 ` Davis Herring
2010-02-16 19:20 ` grischka
2010-02-16 19:55 ` Thien-Thi Nguyen
2010-02-17 13:56 ` alin.s
2010-02-16 20:00 ` Eli Zaretskii
2010-02-16 20:56 ` grischka [this message]
2010-02-17 4:20 ` Eli Zaretskii
-- strict thread matches above, loose matches on Subject: below --
2010-01-29 19:48 grischka
2010-01-30 5:39 ` Stephen J. Turnbull
2010-01-30 9:53 ` David Kastrup
2010-01-30 11:01 ` Stephen J. Turnbull
2010-01-30 11:08 ` David Kastrup
2010-01-30 11:54 ` Paul R
2010-01-30 13:52 ` Stephen J. Turnbull
2010-01-30 11:24 ` Eli Zaretskii
2010-01-30 12:53 ` Alan Mackenzie
2010-01-30 9:57 ` Eli Zaretskii
2010-01-30 11:46 ` Richard Stallman
2010-01-30 12:11 ` Paul R
2010-01-30 13:26 ` Alan Mackenzie
2010-01-30 13:42 ` David Kastrup
2010-01-30 13:49 ` Juanma Barranquero
2010-01-30 13:54 ` Paul R
2010-01-30 15:15 ` Stephen J. Turnbull
2010-01-30 15:07 ` Stephen J. Turnbull
2010-01-31 12:41 ` Richard Stallman
2010-01-31 16:36 ` grischka
2010-02-01 21:06 ` Richard Stallman
2010-02-02 3:32 ` Stephen J. Turnbull
2010-02-02 21:21 ` Richard Stallman
2010-02-02 21:42 ` David Kastrup
2010-02-03 0:24 ` Lennart Borgman
2010-02-03 6:45 ` David Kastrup
2010-02-03 13:34 ` Richard Stallman
2010-02-03 14:15 ` David Kastrup
2010-02-03 14:18 ` Daniel Colascione
2010-02-04 11:01 ` Richard Stallman
2010-02-03 2:48 ` Stephen J. Turnbull
2010-02-03 12:19 ` Juanma Barranquero
2010-02-04 11:00 ` Richard Stallman
2010-02-04 11:06 ` Juanma Barranquero
2010-02-05 12:44 ` Richard Stallman
2010-02-05 18:37 ` grischka
2010-02-03 13:34 ` Richard Stallman
2010-02-03 17:26 ` Stephen J. Turnbull
2010-02-03 17:45 ` David Kastrup
2010-02-03 18:35 ` grischka
2010-02-03 18:36 ` Óscar Fuentes
2010-02-03 19:03 ` Lennart Borgman
2010-02-03 20:31 ` Ted Zlatanov
2010-02-03 20:37 ` Lennart Borgman
2010-02-04 8:23 ` Stephen J. Turnbull
2010-02-04 23:18 ` Richard Stallman
2010-02-05 5:46 ` Stephen J. Turnbull
2010-02-04 11:01 ` Richard Stallman
2010-02-04 11:38 ` David Kastrup
2010-02-05 19:08 ` Richard Stallman
2010-02-04 12:28 ` Stephen J. Turnbull
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: https://www.gnu.org/software/emacs/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4B7B0663.1050202@gmx.de \
--to=grishka@gmx.de \
--cc=eliz@gnu.org \
--cc=emacs-devel@gnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.savannah.gnu.org/cgit/emacs.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).