* bug#12956: 24.2; Move hl-line-mode to display engine so performance reason.
@ 2012-11-21 22:17 Oleksandr Gavenko
2012-11-22 3:45 ` Eli Zaretskii
0 siblings, 1 reply; 3+ messages in thread
From: Oleksandr Gavenko @ 2012-11-21 22:17 UTC (permalink / raw)
To: 12956
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.
--
Best regards!
^ permalink raw reply [flat|nested] 3+ messages in thread
* bug#12956: 24.2; Move hl-line-mode to display engine so performance reason.
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
2012-11-22 21:00 ` Juanma Barranquero
0 siblings, 1 reply; 3+ messages in thread
From: Eli Zaretskii @ 2012-11-22 3:45 UTC (permalink / raw)
To: Oleksandr Gavenko; +Cc: 12956
> 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.
^ permalink raw reply [flat|nested] 3+ messages in thread
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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
2012-11-22 21:00 ` Juanma Barranquero
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