GNU bug report logs - #12956
24.2; Move hl-line-mode to display engine so performance reason.

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Package: emacs; Severity: wishlist; Reported by: Oleksandr Gavenko <gavenkoa@HIDDEN>; merged with #12953; dated Wed, 21 Nov 2012 22:19:01 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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From: Juanma Barranquero <lekktu@HIDDEN>
Date: Thu, 22 Nov 2012 22:00:31 +0100
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Subject: Re: bug#12956: 24.2; Move hl-line-mode to display engine so
	performance reason.
To: Eli Zaretskii <eliz@HIDDEN>
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On Thu, Nov 22, 2012 at 4:45 AM, Eli Zaretskii <eliz@HIDDEN> wrote:

> This is a duplicate of 12953.

It's already merged.

    Juanma
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#12956; Package emacs. Full text available.
Merged 12953 12956. Request was from Eli Zaretskii <eliz@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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Date: Thu, 22 Nov 2012 05:45:42 +0200
From: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#12956: 24.2;
	Move hl-line-mode to display engine so performance reason.
In-reply-to: <87sj82zjmp.fsf@HIDDEN>
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	Content preview: > From: Oleksandr Gavenko <gavenkoa@HIDDEN> > 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. [...] 
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 Content preview:  > From: Oleksandr Gavenko <gavenkoa@HIDDEN> > 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. [...] 
 
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> From: Oleksandr Gavenko <gavenkoa@HIDDEN>
> 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.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#12956; Package emacs. Full text available.
Merged 12953 12956. Request was from Juanma Barranquero <lekktu@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
Forcibly Merged 12953 12956. Request was from Glenn Morris <rgm@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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From: Oleksandr Gavenko <gavenkoa@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: 24.2; Move hl-line-mode to display engine so performance reason.
Date: Thu, 22 Nov 2012 00:17:02 +0200
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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!
Acknowledgement sent to Oleksandr Gavenko <gavenkoa@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#12956; Package emacs. Full text available.
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