The asynchronously decoded image frames has to be cached to prevent flickering, but we have to keep requesting new decoding for the incomplete frame every time it's drawn. This is to avoid drawing an incomplete image frame even after all its encoded data is received.
Created attachment 307048 [details] Patch
<rdar://problem/31132092>
Created attachment 307122 [details] Patch
Can we test this?
Created attachment 309441 [details] Patch
Comment on attachment 309441 [details] Patch Clearing flags on attachment: 309441 Committed r216471: <http://trac.webkit.org/changeset/216471>
All reviewed patches have been landed. Closing bug.