Bug 1759139 Comment 2 Edit History

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Revision 2 by
on 
WebRender rendering should not use SyncPaintFallback. When SyncPaintFallback is used, FallbackRenderer is used. On windows, FallbackRenderer is created for tooltip rendering or when CompositorSession creation is failed.

- https://searchfox.org/mozilla-central/rev/fa69d8b248e6c1df670aa6b019e30ec37e6672be/widget/windows/nsWindow.cpp#7410
- https://searchfox.org/mozilla-central/rev/fa69d8b248e6c1df670aa6b019e30ec37e6672be/widget/windows/nsWindow.cpp#4082
Revision 3 by
on 
WebRender rendering should not use SyncPaintFallback. When SyncPaintFallback is used, FallbackRenderer is used. On windows, FallbackRenderer is created for tooltip rendering(nsWindow::ShouldUseOffMainThreadCompositing() is false) or when CompositorSession creation is failed.

- https://searchfox.org/mozilla-central/rev/fa69d8b248e6c1df670aa6b019e30ec37e6672be/widget/windows/nsWindow.cpp#7410
- https://searchfox.org/mozilla-central/rev/fa69d8b248e6c1df670aa6b019e30ec37e6672be/widget/windows/nsWindow.cpp#4082
Revision 4 by
on 
WebRender rendering should not use SyncPaintFallback. When SyncPaintFallback is used, FallbackRenderer is used. On windows, FallbackRenderer is created for tooltip rendering(nsWindow::ShouldUseOffMainThreadCompositing() is false) or when CompositorSession creation is failed.

- https://searchfox.org/mozilla-central/rev/fa69d8b248e6c1df670aa6b019e30ec37e6672be/widget/windows/nsWindow.cpp#7410
- https://searchfox.org/mozilla-central/rev/fa69d8b248e6c1df670aa6b019e30ec37e6672be/widget/windows/nsWindow.cpp#4082

Then, WebRender seemed not related to this bug.
Revision 5 by
on 
WebRender rendering should not use SyncPaintFallback. When SyncPaintFallback is used, FallbackRenderer is used. On windows, FallbackRenderer is created for tooltip rendering(nsWindow::ShouldUseOffMainThreadCompositing() is false) or when CompositorSession creation is failed.

- https://searchfox.org/mozilla-central/rev/fa69d8b248e6c1df670aa6b019e30ec37e6672be/widget/windows/nsWindow.cpp#7410
- https://searchfox.org/mozilla-central/rev/fa69d8b248e6c1df670aa6b019e30ec37e6672be/widget/windows/nsWindow.cpp#4082

Then, WebRender seemed not related to this bug.

It seemed that DrawThemeBackground() call in nsNativeThemeWin::DrawWidgetBackground() caused the hang

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