not sure how to describe other than it looks like we repeatedly self-copy while scaling and translating.

jeff, any ideas on how fix this? Does GL make this magically better?

(In reply to comment #1) > jeff, any ideas on how fix this? Does GL make this magically better? dougt you should be able to try it out by setting the layers-accelerate.all pref

Has anyone seen this recently?

yes

Does this happen after fuzzy-zooming or another animation? The screenshot looks suspiciously like a failure to clear a surface before rendering translucent content.

Bug 610344 also has "corruption" and that does happen after zooming - using the Form Helper.

need steps to reproduce

Could be related to bug 634759

I still can't reproduce this.

I think this has gotten harder to reproduce as we've gotten faster, but I have been able to see it by repeatedly showing and hiding on this page http://lassey.us/show_hide.html on a hunch I tried zero'ing out our shmem buffer when we create it, and with this patch I don't see this problem anymore

Comment on attachment 515774 [details] [diff] [review] patch never mind, I just saw it again with this patch applied

I tested google docs spreadsheets (which lately has been the most reliable way to reproduce this) with a build stechz provided me with an updated cairo and I cannot reproduce the problem with that build. Marking this as dependent on bug 562746 (Update cairo to 1.10).