On Nov 13, 2004, at 5:50 PM, Jonathan del Strother wrote:
Since I've updated to 10.3.6, I've been seeing some artifacts on my
2nd monitor while running my iTunes plugin.
I believe this is due to me using PBuffers, but I'm having a hard time
narrowing it down precisely. If I get chance, I'll write a test app
tomorrow and see if I get anywhere.
The visual artifacts consists of random horizontal white lines, around
an inch long. They appear for a split second and disappear, random
timing, random positioning, random lengths... They seem to be
clustered around borders: they appear around and on the edges of
windows and on icons. They're not easy to spot: they're not there all
the time and don't stay in the same position.
That sounds like update tearing.
If I turn on display mirroring, the lines appear on my 2nd display (a
19" Sony CRT) but not on my main display (Powerbook 15"). I'm using a
Radeon 9600. I haven't succeeded in taking a screenshot of them.
Has anyone else experienced this? If anyone has a windowed PBuffer
test app that I could try out, that would be much appreciated. Or you
could try downloading my iTunes plugin and see if you get the same
problem
( www.steelskies.com/gaslight/ )
I think that something in 10.3.6 is delaying or slowing swaps and
updates to the screen. In 10.3.5 and earlier, I could smoothly zoom
and scroll a large windowed context on either screen without tearing,
and now under 10.3.6 it occurs much more often, as if something is
blocking the hardware more frequently.
--
Shaun Wexler
MacFOH http://www.macfoh.com
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