[Bug 66163] Sporadic image corruptions in firefox for images which were not cached

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66163

--- Comment #13 from Chris Wilson <chris at chris-wilson.co.uk> ---
They copy the icons to a fresh pixmap before doing a getimage... I guess that
is to avoid the error of reading an offscreen window, but it causes a stall as
the original source is idle (on the GPU but coherent with the CPU), becomes
active for the copy and then we need to wait for the copy to finish before
completing the getimage. If I was smart I could elide that intermediate copy...

Digression. Back to bug hunting.

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