From: Tassilo Horn <tsdh@gnu.org>
To: Alan Mackenzie <acm@muc.de>
Cc: Eli Zaretskii <eliz@gnu.org>,
Stefan Monnier <monnier@iro.umontreal.ca>,
emacs-devel@gnu.org
Subject: Re: Unfreezing the display during auto-repeated scrolling. Simpler approach.
Date: Sun, 23 Nov 2014 20:44:39 +0100 [thread overview]
Message-ID: <87egstaehk.fsf@thinkpad-t440p.tsdh.org> (raw)
In-Reply-To: <20141123104038.GA3542@acm.acm> (Alan Mackenzie's message of "Sun, 23 Nov 2014 10:40:38 +0000")
Alan Mackenzie <acm@muc.de> writes:
Hi Alan,
>> But I've applied your patch and run "make", fired up a new emacs and
>> set `use-default-face-for-fast-scrolling' to t, then found a large
>> file and pressed and held `C-v'. I couldn't see any difference
>> compared to not having the option enabled. All the text that's
>> passing by is still fontified and scrolling doesn't seem faster.
>
> The main point is, text continues to pass by. What was happening was
> that on an auto-repeated C-v, Emacs would hang (without scrolling),
> and after releasing the key, it took quite a few seconds before the
> display would be updated. During this time Emacs was completely
> unresponsive.
>
> With `use-default-face-for-fast-scrolling' at nil, all the text
> scrolled over gets fontified, and lesser machines (such as mine)
> cannot keep up. With the option set to t, only the text being
> displayed gets fontified. The appearance may be of text continually
> scrolling, but this is an illusion; only parts of the scrolled over
> text get fontified and displayed.
>
> To see the effect, make your window as large as possible (mine was 66
> lines deep) and try with a file like .../src/xdisp.c. Toggle
> font-lock-mode off and on between each try. If you still don't see any
> difference, then your machine is powerful enough not to need the feature.
Oh, indeed. My machine is pretty fast at least for a laptop, but when
holding C-v the display freezes very quickly as you say. With
`use-default-face-for-fast-scrolling' I don't get such freezes, so this
looks like a very good feature to me (2nd best after "make the display
engine faster").
But still I think the variable's name is a bit misleading. I expected
to see the text that scrolls by black on white, i.e., using the default
face similar to having `jit-lock-defer-time' set to some non-nil value.
But instead the text that scrolls by and is visible is fontified using
the normal font-lock faces.
Bye,
Tassilo
next prev parent reply other threads:[~2014-11-23 19:44 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-19 14:17 Aborting display. Is this possible? Alan Mackenzie
2014-10-19 14:32 ` David Kastrup
2014-10-19 14:54 ` Eli Zaretskii
2014-10-19 14:50 ` Eli Zaretskii
2014-10-19 15:42 ` Alan Mackenzie
2014-10-19 18:09 ` Eli Zaretskii
2014-10-20 11:09 ` Alan Mackenzie
2014-10-20 11:30 ` David Kastrup
2014-10-20 12:00 ` Alan Mackenzie
2014-10-20 15:15 ` Eli Zaretskii
2014-10-20 15:12 ` Eli Zaretskii
2014-10-20 16:56 ` Stefan Monnier
2014-10-20 17:10 ` Eli Zaretskii
2014-10-20 17:40 ` Eli Zaretskii
2014-10-20 18:57 ` Alan Mackenzie
2014-10-20 19:24 ` Eli Zaretskii
2014-10-20 21:08 ` Alan Mackenzie
2014-10-21 8:09 ` David Kastrup
2014-10-21 10:58 ` Alan Mackenzie
2014-10-21 11:04 ` David Kastrup
2014-10-21 14:25 ` Stefan Monnier
2014-10-21 14:01 ` Stefan Monnier
2014-10-21 15:35 ` Eli Zaretskii
2014-10-21 16:27 ` Stefan Monnier
2014-10-22 18:28 ` Stephen Leake
2014-10-22 20:10 ` Stefan Monnier
2014-10-21 17:14 ` Alan Mackenzie
2014-10-21 18:00 ` Eli Zaretskii
2014-10-21 18:38 ` Alan Mackenzie
2014-10-21 18:43 ` Eli Zaretskii
2014-10-21 19:42 ` Eli Zaretskii
2014-10-26 12:43 ` Unfreezing the display during auto-repeated scrolling. [ Was: Aborting display. Is this possible? ] Alan Mackenzie
2014-10-26 16:45 ` Eli Zaretskii
2014-10-26 20:03 ` Alan Mackenzie
2014-10-26 20:20 ` Eli Zaretskii
2014-10-26 20:42 ` Stefan Monnier
2014-10-26 22:15 ` Unfreezing the display during auto-repeated scrolling Alan Mackenzie
2014-10-27 1:03 ` Stefan Monnier
2014-10-27 14:28 ` Unfreezing the display during auto-repeated scrolling. Simpler approach Alan Mackenzie
2014-10-27 16:51 ` Eli Zaretskii
2014-10-27 19:13 ` David Engster
2014-10-27 19:26 ` Eli Zaretskii
2014-10-27 19:36 ` David Engster
2014-10-27 19:38 ` Alan Mackenzie
2014-10-27 21:38 ` Stefan Monnier
2014-10-28 18:10 ` Alan Mackenzie
2014-10-29 0:57 ` Stefan Monnier
2014-10-29 14:14 ` Eli Zaretskii
2014-10-29 14:52 ` Alan Mackenzie
2014-10-29 15:37 ` Eli Zaretskii
2014-10-29 16:59 ` Stefan Monnier
2014-10-29 21:25 ` Alan Mackenzie
2014-10-30 1:49 ` Stefan Monnier
2014-10-30 22:09 ` Alan Mackenzie
2014-10-31 3:06 ` Stefan Monnier
2014-10-31 7:55 ` Eli Zaretskii
2014-10-31 14:04 ` Stefan Monnier
2014-11-21 15:44 ` Alan Mackenzie
2014-11-23 9:51 ` Tassilo Horn
2014-11-23 10:40 ` Alan Mackenzie
2014-11-23 19:44 ` Tassilo Horn [this message]
2014-11-23 22:04 ` Alan Mackenzie
2014-11-24 11:34 ` Tassilo Horn
2014-11-24 11:53 ` David Kastrup
2014-11-24 16:00 ` Alan Mackenzie
2014-11-24 14:37 ` Stefan Monnier
2014-11-24 16:08 ` Alan Mackenzie
2014-11-24 17:44 ` Stefan Monnier
2014-10-27 3:36 ` Unfreezing the display during auto-repeated scrolling Eli Zaretskii
2014-10-27 10:05 ` Alan Mackenzie
2014-10-27 16:48 ` Eli Zaretskii
2014-10-27 22:46 ` Alan Mackenzie
2014-10-28 0:22 ` Stefan Monnier
2014-10-27 3:33 ` Unfreezing the display during auto-repeated scrolling. [ Was: Aborting display. Is this possible? ] Eli Zaretskii
2014-10-21 18:01 ` Aborting display. Is this possible? Stefan Monnier
2014-10-21 15:40 ` Eli Zaretskii
2014-10-21 17:00 ` Michael Welsh Duggan
2014-10-21 18:25 ` Alan Mackenzie
2014-10-20 1:59 ` Stefan Monnier
2014-10-20 2:45 ` Eli Zaretskii
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