RESOLVED FIXED 187404
Check that LayerTreeHost was created before use 
https://bugs.webkit.org/show_bug.cgi?id=187404
Summary Check that LayerTreeHost was created before use
Stephan Szabo
Reported 2018-07-06 13:01:48 PDT
Check that LayerTreeHost was created before use
Attachments
Patch (1.41 KB, patch)
2018-07-06 13:03 PDT, Stephan Szabo 		no flags
DetailsFormatted DiffDiff
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Stephan Szabo
Comment 1 2018-07-06 13:03:39 PDT
Created attachment 344443 [details] Patch
Stephan Szabo
Comment 2 2018-07-06 13:05:21 PDT
I'm not sure if this is the best way to handle this, but while working on web inspector for wincairo non-legacy, we hit crashes just after this point because LayerTreeHost::create returns nullptr if not USE(COORDINATED_GRAPHICS_THREADED) but this code acts as if it will always get one.
Fujii Hironori
Comment 3 2018-07-08 22:00:28 PDT
I think Windows WK2 MiniBrowser should disable AC by using WKPreferencesSetAcceleratedDrawingEnabled until AC is supported.
Fujii Hironori
Comment 4 2018-07-08 22:12:10 PDT
Ah. Your primary aim is the web inspector. IIRC, the web inspector is using AC to paint element highlights.
Fujii Hironori
Comment 5 2018-07-09 01:59:53 PDT
Stephan, what will happen in AC mode pages after applying your change? All becomes blank pages instead of having crash?
WebKit Commit Bot
Comment 6 2018-07-09 11:21:08 PDT
Comment on attachment 344443 [details] Patch Clearing flags on attachment: 344443 Committed r233647: <https://trac.webkit.org/changeset/233647>
WebKit Commit Bot
Comment 7 2018-07-09 11:21:10 PDT
All reviewed patches have been landed. Closing bug.
Radar WebKit Bug Importer
Comment 8 2018-07-09 11:27:22 PDT
<rdar://problem/41981386>
Fujii Hironori
Comment 9 2018-07-09 20:06:25 PDT
Bug 187503 – [Win][MiniBrowser] Disable accelerated compositing until it is supported
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