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bug#16621: 24.3.50; Periodic timer + overlays = flickering near point
From: |
Jan D. |
Subject: |
bug#16621: 24.3.50; Periodic timer + overlays = flickering near point |
Date: |
Tue, 4 Feb 2014 23:08:13 +0100 |
Hi.
4 feb 2014 kl. 17:00 skrev Eli Zaretskii <eliz@gnu.org>:
>> Date: Tue, 04 Feb 2014 08:17:38 +0200
>> From: Dmitry Gutov <dgutov@yandex.ru>
>> CC: 16621@debbugs.gnu.org, monnier@IRO.UMontreal.CA
>>
>>> You mean, outside Emacs? Yes, probably, but then this isn't an Emacs
>>> issue, and I know absolutely nothing about it.
>>
>> Would a windowing system know which Emacs display states are
>> "consistent", and which aren't?
>
> If hints are needed, we could do that.
>
>> AFAIU, flickering happens when the screen refreshes while Emacs display
>> is in an inconsistent state. Like, you've cleared a rectangle to paint a
>> character in it, but haven't yet painted it
>>
>> If you copied the rendered state into a buffer, then cleared and painted
>> the character there, then rendered the buffer into the window as a
>> whole, the windowing system won't get a chance to see and display the
>> intermediate state.
>
> Avoiding the cursor redraws sounds much easier, but again, I'm not an
> expert on this. Perhaps Jan could comment.
Avoiding the cursor redraws must be easier. Implementing double buffering is
more work.
Not rocket sience, but it would probably take a while to get it right.
Ironically we turn off the Gtk double buffering, because it only works with Gtk
drawing functions,
and Emacs uses X functions. A more long term solution would be to use Cairo.
There is a patch
for it, but it does not work on the trunk. Mainly because the ftfont backend
is broken.
So, if there is a way to avoid cursor redraws, go for it. All ports benefit.
Double buffering is a port specific solution, unless the display engine does
double buffering by having two sets of glyphs and compares them to see what has
really changed. Sounds like a big project.
Jan D.
- bug#16621: 24.3.50; Periodic timer + overlays = flickering near point, (continued)
- bug#16621: 24.3.50; Periodic timer + overlays = flickering near point, Stefan Monnier, 2014/02/02
- bug#16621: 24.3.50; Periodic timer + overlays = flickering near point, Eli Zaretskii, 2014/02/03
- bug#16621: 24.3.50; Periodic timer + overlays = flickering near point, Stefan Monnier, 2014/02/03
- bug#16621: 24.3.50; Periodic timer + overlays = flickering near point, Eli Zaretskii, 2014/02/03
- bug#16621: 24.3.50; Periodic timer + overlays = flickering near point, Stefan Monnier, 2014/02/03
- bug#16621: 24.3.50; Periodic timer + overlays = flickering near point, Eli Zaretskii, 2014/02/03
bug#16621: 24.3.50; Periodic timer + overlays = flickering near point, Dmitry Gutov, 2014/02/03
- bug#16621: 24.3.50; Periodic timer + overlays = flickering near point, Eli Zaretskii, 2014/02/03
- bug#16621: 24.3.50; Periodic timer + overlays = flickering near point, Dmitry Gutov, 2014/02/04
- bug#16621: 24.3.50; Periodic timer + overlays = flickering near point, Eli Zaretskii, 2014/02/04
- bug#16621: 24.3.50; Periodic timer + overlays = flickering near point,
Jan D. <=
- bug#16621: 24.3.50; Periodic timer + overlays = flickering near point, Eli Zaretskii, 2014/02/04
- bug#16621: 24.3.50; Periodic timer + overlays = flickering near point, Jan Djärv, 2014/02/05
- bug#16621: 24.3.50; Periodic timer + overlays = flickering near point, Eli Zaretskii, 2014/02/05
bug#16621: 24.3.50; Periodic timer + overlays = flickering near point, Stefan Monnier, 2014/02/05
bug#16621: 24.3.50; Periodic timer + overlays = flickering near point, Eli Zaretskii, 2014/02/05
bug#16621: 24.3.50; Periodic timer + overlays = flickering near point, Stefan Monnier, 2014/02/05
bug#16621: 24.3.50; Periodic timer + overlays = flickering near point, Eli Zaretskii, 2014/02/05
bug#16621: 24.3.50; Periodic timer + overlays = flickering near point, Stefan Monnier, 2014/02/05
bug#16621: 24.3.50; Periodic timer + overlays = flickering near point, Eli Zaretskii, 2014/02/06
bug#16621: 24.3.50; Periodic timer + overlays = flickering near point, Stefan Monnier, 2014/02/06