[Xquartz-dev] Xcomposite extension in XQuartz

[nicolas bats]

Hi,
I would like to second  you on this point as I've also noticed some lags
while scrolling windows on MacOSX (with the latest   XQuartz)

Best regards,
Nicolas

Le ven. 1 avr. 2016 04:03, John D. Duncan, III <duncanjdiii at gmail.com> a
écrit :

> Hello all. I was wondering if there is any word on the status of getting
> the COMPOSITE extension built into XQuartz? I personally use a bunch of
> UNIX-y GUI programs and dockapps (some of them quite old). I've found
> that, when doing graphically intensive actions (such as quickly
> scrolling in a unicode-rxvt term, forwarding my SSH session to XQuartz
> to write LaTeX/use eclipse from our campus workstation computers/submit
> moodle assignments in firefox), that there is quite a good deal of
> graphical sluggishness. CPU use does not spike much, so I am assuming
> that this is a flaw of the X server rendering itself (or perhaps the OS
> X drivers?).
>
> I have somewhat superficial knowledge of the COMPOSITE extension, but I
> was under the impression that X11 compositors (such as compton) get
> around this issue by using open-gl/randr rendering as their graphical
> back-end (among many other hacks).
>
> It seems that programs which do use open-gl rendering are unaffected by
> the sluggishness caused by my dockapss (glxgears, for example).
>
> I was also under the impression that most modern UNIX-y Desktop
> Environments (such as Gnome, KDE, etc.) come with compositors built in
> (for eye-candy such as v-synch, drop shadows, smooth scrolling, etc.).
>
> It seems like adding COMPOSITE extension support could potentially bring
> over users from other operating systems (especially with the wonderful
> pkg-src development from Jonathan Perkin at joyent) that could further
> help re-vitalize the OS X open-source community.
>
> I know that, normally, to enable the composite extension in X11 you
> would just add:
>
> Section "Extensions"
>      Option         "Composite" "Enable"
> EndSection
>
> to your xorg.conf file. As we know, XQuartz uses a different system
> where all of the X server extensions are always started on launch
> (xrandr, etc.)
>
> Am I missing something, or is XQuartz still being built without the
> COMPOSITE extension enabled? I remember reading archives from the past
> that explained how builds would fail while trying to compile with
> COMPOSITE support [1]. That was years ago, and I thought there was a
> modern XQuartz branch that supported the extension..[0]
>
> Here are some (bad examples) of the issue that I am talking about:
> http://cs.gettysburg.edu/~duncjo01/XQuartz.webm
> http://cs.gettysburg.edu/~duncjo01/XQuartz-glx.webm
>
> Notice how, especially in the second screencast, extreme scrolling in
> the urxvt buffer causes the dockapps to hang, while the glxgears program
> chugs along at a smooth 60fps. I was hoping that enabling the COMPOSITE
> extension and using a compositor such as compton could alleviate such
> issues in the future.
>
> Let me apologize in advanced if I have interpreted this issue completely
> incorrectly; I am no X11 expert.
>
> [0]:
> https://lists.macosforge.org/pipermail/xquartz-changes/2011-May/001054.html
>
> [1]: http://lists.apple.com/archives/x11-users/2011/Feb/msg00013.html
>
> - John D.
>
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