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List:       kde-games-devel
Subject:    [Kde-games-devel] QGV repaint and update performance
From:       Martin Heni <martin () heni-online ! de>
Date:       2007-02-20 7:05:33
Message-ID: 200702200805.33682.martin () heni-online ! de
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I looked into this and found a similar behaviour for kwin4:

1. scenario with updates enabled:
   Xorg eats 50% processor, kwin4 hardly anything
   Qt repaints the whole game canvas

2. scenario without update 
  Xorg eats not much processor but kwin goes to 70-80%
  Qt properly repaints only the changed/moved sprites

I assume the jumpy behaviour comes when kwin4 reaches occasionally 100% 
processor load.
However, why this is is totally unclear to me. This must be some QGV problems.
Maybe just hope for a new Qt release. Does anybody know whether Trolltech is 
aware of these issues? 


> The removement of update() causes kwin4's introductory animation not to
> run smothly and consume 60% of my processor as kwin4 process. When this
> function is called in KWin4View::updateAndAdvance() the objects move
> smoother but Xorg "eats up" 50% of my processing power.
>
> Is it hardware-specific problem? My laptop has Intel Pentium M 1.76Ghz
> processor and Intel 915GM graphics controller.
>
> Regards
>  Tomasz Boczkowski
>
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> kde-games-devel@kde.org
> https://mail.kde.org/mailman/listinfo/kde-games-devel
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