From: Eli Zaretskii <eliz@gnu.org>
To: Oleksandr Gavenko <gavenkoa@gmail.com>
Cc: 12956@debbugs.gnu.org
Subject: bug#12956: 24.2; Move hl-line-mode to display engine so performance reason.
Date: Thu, 22 Nov 2012 05:45:42 +0200 [thread overview]
Message-ID: <837gpeuwpl.fsf@gnu.org> (raw)
In-Reply-To: <87sj82zjmp.fsf@gavenkoa.example.com>
> From: Oleksandr Gavenko <gavenkoa@gmail.com>
> Date: Thu, 22 Nov 2012 00:17:02 +0200
>
> >From http://debbugs.gnu.org/cgi/bugreport.cgi?bug=12927
>
> > > Also I found that "(global-hl-line-mode 1)" slow down scrolling in CC-mode
> > > enabled buffers in two or more times. Do I need report a bug?
>
> > No, this is expected. hl-line-mode adds itself to post-command-hook,
> > and moves its overlay after each command that changes the current
> > line. What this does is completely disable the redisplay
> > optimizations used when only the cursor moves without any other
> > changes to the text, because moving an overlay requires a thorough
> > redisplay of the window, which is more expensive.
>
> > The only bug report that I can think of is a feature request to move
> > hl-line-mode into the display engine, because the display engine
> > knowns very well where's the current line (when it decides where to
> > display the cursor), and can do this highlighting better and much more
> > efficiently.
This is a duplicate of 12953.
next prev parent reply other threads:[~2012-11-22 3:45 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-21 22:17 bug#12956: 24.2; Move hl-line-mode to display engine so performance reason Oleksandr Gavenko
2012-11-22 3:45 ` Eli Zaretskii [this message]
2012-11-22 21:00 ` Juanma Barranquero
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