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Re: Aborting display. Is this possible?
From: |
Eli Zaretskii |
Subject: |
Re: Aborting display. Is this possible? |
Date: |
Tue, 21 Oct 2014 18:40:30 +0300 |
> Date: Mon, 20 Oct 2014 21:08:19 +0000
> Cc: address@hidden
> From: Alan Mackenzie <address@hidden>
>
> > Also, "enters redisplay" needs to be taken with a grain of salt here.
> > The reference is to display "simulation", whereby Emacs proceeds
> > through buffer text line after line, computing the metrics of the
> > characters as it goes (and invoking fontification functions if
> > needed), but doesn't store the results in glyph matrices and doesn't
> > proceed to redrawing based on that. So it's only partial redisplay.
> > The full redisplay will be done later, after the scrolling command did
> > its part, and Emacs is back in the command loop with no available
> > input.
>
> Yes, I've got that. But in CC Mode, it's the fontification which takes
> most of the time (see also below).
Then I suggest to boost the speed of that. Optimizations should be
done in the part that takes the 80 or 90% of the time.
> > There isn't really a good solution for when input comes in faster than
> > Emacs can process it.
>
> Er, making Emacs process the input faster?
It is already very fast, as your measurements suggest. What slows us
down is fontifications. That's where we should try to optimize.
> > > And each such PageDown key will necessitate full font-locking for its
> > > never-to-be-displayed screen.
>
> > No, not full, only partial. See above.
>
> I don't see the "above" here. When I tested the `fontified' property
> this morning, EVERY position from point-min to point had been fontified.
I thought I've already succeeded in explaining why.
"Partial" here means that the actual drawing to the glass is not
done. Fontifications _are_ done, because without that, Emacs would
not know where in the buffer is that point N screenfuls away.
- Re: Aborting display. Is this possible?, (continued)
- Re: Aborting display. Is this possible?, Stefan Monnier, 2014/10/21
- Re: Aborting display. Is this possible?, Eli Zaretskii, 2014/10/21
- Re: Aborting display. Is this possible?, Stefan Monnier, 2014/10/21
- Re: Aborting display. Is this possible?, Alan Mackenzie, 2014/10/21
- Re: Aborting display. Is this possible?, Eli Zaretskii, 2014/10/21
- Re: Aborting display. Is this possible?, Stefan Monnier, 2014/10/21
- Re: Aborting display. Is this possible?,
Eli Zaretskii <=
- Re: Aborting display. Is this possible?, Michael Welsh Duggan, 2014/10/21
- Re: Aborting display. Is this possible?, Alan Mackenzie, 2014/10/21
- Re: Aborting display. Is this possible?, Stefan Monnier, 2014/10/19
- Re: Aborting display. Is this possible?, Eli Zaretskii, 2014/10/19
Aborting display. Is this possible?, grischka, 2014/10/20