Ah, Attachment 9076991 [details] does not work, since external buffer uses resource_cache. https://searchfox.org/mozilla-central/source/gfx/wr/webrender/src/resource_cache.rs#1569
Bug 1564646 Comment 3 Edit History
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Ah, Attachment 9076991 [details] does not work, since external buffer uses resource_cache. Then there is a case that a external image buffer is not counted as active image when picture cache is not updated. https://searchfox.org/mozilla-central/source/gfx/wr/webrender/src/resource_cache.rs#1569