RESOLVED FIXED 151829
Remove the use of GraphicsContextStateSaver from RenderLayer::paintLayerByApplyingTransform 
https://bugs.webkit.org/show_bug.cgi?id=151829
Summary Remove the use of GraphicsContextStateSaver from RenderLayer::paintLayerByApp...
Said Abou-Hallawa
Reported 2015-12-03 15:10:00 PST
Saving/Restoring the GraphicsContext is an expensive operation. It should be used when the number to save/restore options in the context is large. But when only one option is set and later is restored, it is a lot cheaper to do that save/restore explicitly. Here are some results: When using GraphicsContextStateSaver in RenderLayer::paintLayerByApplyingTransform: Test Name Score Complexity FPS Avg. W.5% Std. % Avg. W.5% Std. % CSS bouncing circles 419.84 444.72 396.34 25.86 5.82 49.53 44.73 2.30 4.65 When removing GraphicsContextStateSaver from RenderLayer::paintLayerByApplyingTransform: Test Name Score Complexity FPS Avg. W.5% Std. % Avg. W.5% Std. % CSS bouncing circles 491.74 532.11 454.44 38.40 7.22 48.66 43.87 2.84 5.83
Attachments
Patch (2.28 KB, patch)
2015-12-03 15:15 PST, Said Abou-Hallawa 		no flags
DetailsFormatted DiffDiff
View All Add attachment proposed patch, testcase, etc.
Said Abou-Hallawa
Comment 1 2015-12-03 15:15:31 PST
Created attachment 266566 [details] Patch
Radar WebKit Bug Importer
Comment 2 2015-12-03 15:16:33 PST
<rdar://problem/23751015>
WebKit Commit Bot
Comment 3 2015-12-03 16:50:04 PST
Comment on attachment 266566 [details] Patch Clearing flags on attachment: 266566 Committed r193390: <http://trac.webkit.org/changeset/193390>
WebKit Commit Bot
Comment 4 2015-12-03 16:50:07 PST
All reviewed patches have been landed. Closing bug.
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