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Re: C-n is very slow in Font-Lock mode
From: |
Eli Zaretskii |
Subject: |
Re: C-n is very slow in Font-Lock mode |
Date: |
Wed, 27 Apr 2005 12:19:27 +0300 |
> Cc: address@hidden
> From: David Kastrup <address@hidden>
> Date: Wed, 27 Apr 2005 00:57:05 +0200
>
> Without looking at the code, it would be my guess that it would
> currently run immediately after redisplay, whereas my suggestion for
> jit-lock-defer-time=0 semantics would be that it be run immediately
> before redisplay.
I'm not sure what that means. You _are_ aware that, when you scroll
thru text with C-n or C-v, there's almost nothing going on in Emacs
_except_ redisplay, yes? That is, all C-n does is move point one
line; the rest is redisplay's job, including fontification. (The
single most important new aspect of JIT lock as opposed to the old
lazy-lock and its ilk was that JIT lock uses special hooks of the
display engine, whereas the old, pre-v21 redisplay didn't have such
hooks, and so lazy-lock needed to jump through the hoops to hook into
every possible method of changing the displayed text.)
So when you are saying ``before redisplay'', what exactly do you mean?
Redisplay begins by computing the ``desired glyph matrix'', which is
an internal representation of what should be on the screen; surely,
before this happens, there's no way we could fontify the right portion
of the text, since we have no idea what that portion is.
> > And fontification of the visible portion will take time during which
> > one still sees unfontified text, anyway.
>
> Not if it happens before redisplay. [...]
>
> It would possibly make sense to implement this distinction in the
> context of run-with-idle-timer, and then let jit-lock-defer-time just
> use it by defaulting to -1.
Idle timers run when Emacs is idle, which by definition is _after_
redisplay did its job. So I think you are talking about some nw
mechanism, which has nothing to do with how jit-lock-defer-time works
now.
> Again: I have not looked at the code.
Well, perhaps you should.
- Re: C-n is very slow in Font-Lock mode, (continued)
- Re: C-n is very slow in Font-Lock mode, Eli Zaretskii, 2005/04/27
- Re: C-n is very slow in Font-Lock mode, Richard Stallman, 2005/04/28
- Re: C-n is very slow in Font-Lock mode, Eli Zaretskii, 2005/04/26
- Re: C-n is very slow in Font-Lock mode, David Kastrup, 2005/04/26
- Re: C-n is very slow in Font-Lock mode, Eli Zaretskii, 2005/04/26
- Re: C-n is very slow in Font-Lock mode, David Kastrup, 2005/04/26
- Re: C-n is very slow in Font-Lock mode,
Eli Zaretskii <=
- Re: C-n is very slow in Font-Lock mode, David Kastrup, 2005/04/27
- Re: C-n is very slow in Font-Lock mode, Eli Zaretskii, 2005/04/27
- Re: C-n is very slow in Font-Lock mode, David Kastrup, 2005/04/27
- Re: C-n is very slow in Font-Lock mode, Eli Zaretskii, 2005/04/27
- Re: C-n is very slow in Font-Lock mode, Kim F. Storm, 2005/04/27
- Re: C-n is very slow in Font-Lock mode, Richard Stallman, 2005/04/28
- Re: C-n is very slow in Font-Lock mode, David Kastrup, 2005/04/28
- Re: C-n is very slow in Font-Lock mode, David Kastrup, 2005/04/27
- Re: C-n is very slow in Font-Lock mode, Richard Stallman, 2005/04/28