We only use the dirty rect for a shared surface properly for the first WebRenderLayerManager requiring a resource update. Other instances using the same image may end up not updating at all. This will probably only be visible for really large, slow to download/decode images, but I could see it happening where you click a downscaled image and it opens a new tab to view the full sized image (but they point to the same resource).
Assignee: nobody → aosmond
Status: NEW → ASSIGNED
Priority: -- → P1
Attachment #8998625 - Flags: review?(nical.bugzilla) → review+
Pushed by email@example.com: https://hg.mozilla.org/integration/mozilla-inbound/rev/0386ff1e9956 Store a shared surface's dirty rect update if we cannot process it immediately. r=nical
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