[Bug 85064] modesetting driver plus DRI3 causes extremely slow scrolling with WebKitGTK+ in accelerated compositing mode

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85064

--- Comment #40 from Carlos Garcia Campos <carlosgc at gnome.org> ---
(In reply to Dave Airlie from comment #37)
> 00:46 < airlied> keithp: dri3/present question
> 00:46 -!- ofourdan [~ofourdan at 107-2.ar.fundp.ac.be] has quit [Ping timeout:
> 260 seconds]
> 00:46 < airlied> keithp: epiphany/webkit appears to be drawing offscreen
> 00:46 < keithp> a fine plan
> 00:46 < airlied> and currently -modeseting returned no crtc for that
> 00:46 -!- ofourdan [~ofourdan at 107-2.ar.fundp.ac.be] has joined #xorg-devel
> 00:46 < airlied> so we ended up throttling to the 1s fake crtc
> 00:47 < keithp> oh, 'offscreen' and not to a pixmap?
> 00:47 < airlied> yup offscreen not a pixmap
> 00:47 < keithp> wtf?
> 00:47 < airlied> I can say bong :)
> 00:47 < keithp> well, sucks to do something stupid?
> 00:47 < airlied> yes appears to be a window at +2000 or something
> 00:47 < keithp> and so what would they like us to do?
> 00:48 < airlied> "x = 2881, 
> 00:48 < airlied>     y = 0, width = 2910, height = 1783"

Yes, this is because we use the screen width + 1 to position our window
offscreen:

WidthOfScreen(screen) + 1, 0, 1, 1,

and it turns out that simply using -1, -1 as coordinates fixes the problem.

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