[Bug 17129] Slow to move translucent windows above a certain size with EXA (r300)

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=17129





--- Comment #9 from Joel Feiner <jafeiner at gmail.com>  2008-08-29 05:20:51 PST ---
(In reply to comment #8)
> (In reply to comment #7)
> > I found an interesting phenonemon today.  If I alt-drag the translucent window
> > if it's underneath another window, say, Konsole, then the slowness disappears
> > (and almost no CPU time is used).  Bring it back above Konsole and the movement
> > is slow and laggy again.  But moving it around near the side of the screen,
> > where maybe 2/3 to 3/4's of the translucent window is off the edge of the
> > screen (or less) causes the lagginess to subside.
> 
> Sounds like the translucent window is composited by the CPU instead of the GPU.
> It would be interesting to track down why that is happening, e.g. by rebuilding
> the driver with RADEON_TRACE_FALL defined to 1 in src/radeon_exa.c, or if that
> doesn't show anything interesting by rebuilding xserver with DEBUG_TRACE_FALL
> defined to 1 in exa/exa_priv.h.
> 

Yep, that's where the issue is.  The log file shows a bunch of these:

R300CheckComposite: Component alpha not supported with source alpha and source
value blending.

And a bunch of these:

R300CheckCompositeTexture: Unsupported picture format 0x1011000

They come in chunks of 10-20 lines.  It seems when I tried to move the window
faster, I would get more of the former message.  Hopefully, this will all be of
use to you.


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