RESOLVED FIXED 106502
Don't drop to huge tile mode if we're only slow-scrolling because of a page overlay 
https://bugs.webkit.org/show_bug.cgi?id=106502
Summary Don't drop to huge tile mode if we're only slow-scrolling because of a page o...
Tim Horton
Reported 2013-01-09 16:39:53 PST
We only use the MainThreadScrollingReason "ForcedOnMainThread" if we install a page overlay (didInstallPageOverlay), which clients can do arbitrarily. We probably should still use tile-sized tiles in this case (this will also prevent us from falling into gigantic tiles for WebKit2 find-in-page, among other things).
Attachments
no giant tiles (1.77 KB, patch)
2013-01-09 16:42 PST, Tim Horton 		simon.fraser: review+
DetailsFormatted DiffDiff
View All Add attachment proposed patch, testcase, etc.
Simon Fraser (smfr)
Comment 1 2013-01-09 16:40:17 PST
And the web inspector.
Tim Horton
Comment 2 2013-01-09 16:42:06 PST
Created attachment 182012 [details] no giant tiles
Anders Carlsson
Comment 3 2013-01-09 16:45:57 PST
Comment on attachment 182012 [details] no giant tiles View in context: https://bugs.webkit.org/attachment.cgi?id=182012&action=review > Source/WebCore/rendering/RenderLayerBacking.cpp:204 > - if (scrollingCoordinator->shouldUpdateScrollLayerPositionOnMainThread()) > + if (scrollingCoordinator->mainThreadScrollingReasons() & ~ScrollingCoordinator::ForcedOnMainThread) I think you should explain what this does with a comment.
Tim Horton
Comment 4 2013-01-09 16:46:43 PST
(In reply to comment #3) > (From update of attachment 182012 [details]) > View in context: https://bugs.webkit.org/attachment.cgi?id=182012&action=review > > > Source/WebCore/rendering/RenderLayerBacking.cpp:204 > > - if (scrollingCoordinator->shouldUpdateScrollLayerPositionOnMainThread()) > > + if (scrollingCoordinator->mainThreadScrollingReasons() & ~ScrollingCoordinator::ForcedOnMainThread) > > I think you should explain what this does with a comment. okiedokie.
Tim Horton
Comment 5 2013-01-09 16:51:52 PST
<rdar://problem/12959143>
Tim Horton
Comment 6 2013-01-09 16:52:00 PST
http://trac.webkit.org/changeset/139258
Note You need to log in before you can comment on or make changes to this bug.