If you were already running a patched X server (with the backclear patch) you probably wouldn't notice much difference with the 2D code. The big deal is that you don't need a patched X server any more.
I don't think 10.6 changes anything w.r.t. tearing - the key point is that it didn't make a lot of sense to work on tearing in the old accel framework; once we finish rolling out the new accel framework (still some work to do) then at least we have a decent starting point for looking at video tearing.
In the meantime, we still recommend the use of GL output rather than Xv for video.
I don't think 10.6 changes anything w.r.t. tearing - the key point is that it didn't make a lot of sense to work on tearing in the old accel framework; once we finish rolling out the new accel framework (still some work to do) then at least we have a decent starting point for looking at video tearing.
In the meantime, we still recommend the use of GL output rather than Xv for video.
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