Bug 75007 – [CSSRegions]Rollout support for background-color region styling

• Component: CSS
• Status: RESOLVED FIXED

[Mihnea Ovidenie]

Temporary rollout support for region styling (background-color) since it causes performance regression (see https://bugs.webkit.org/show_bug.cgi?id=74141). I will add the support back after:
1. Improve speed of methods that call RenderObject::style() extensively
2. Finish analyze the regression in performance of the current patch.

[Mihnea Ovidenie]

Created attachment 120179 [details]
Patch

[Tony Chang]

Comment on attachment 120179 [details]
Patch

Thanks!

[WebKit Review Bot]

Comment on attachment 120179 [details]
Patch

Rejecting attachment 120179 [details] from commit-queue.

Failed to run "['/mnt/git/webkit-commit-queue/Tools/Scripts/webkit-patch', '--status-host=queues.webkit.org', '-..." exit_code: 2

Last 500 characters of output:
WebCore/rendering/RenderObject.cpp
patching file Source/WebCore/rendering/RenderObject.h
patching file Source/WebCore/rendering/RenderObjectChildList.cpp
patching file Source/WebCore/rendering/RenderRegion.cpp
patching file Source/WebCore/rendering/RenderRegion.h
patching file Source/WebCore/rendering/RenderView.cpp
patching file Source/WebCore/rendering/RenderView.h

Failed to run "[u'/mnt/git/webkit-commit-queue/Tools/Scripts/svn-apply', u'--reviewer', u'Tony Chang', u'--force']" exit_code: 1

Full output: http://queues.webkit.org/results/11039357

[Mihnea Ovidenie]

Created attachment 121104 [details]
Patch for landing

[WebKit Review Bot]

Comment on attachment 121104 [details]
Patch for landing

Clearing flags on attachment: 121104

Committed r104036: <http://trac.webkit.org/changeset/104036>

[WebKit Review Bot]

All reviewed patches have been landed.  Closing bug.

[Tony Chang]

This didn't seem to change the perf results, so the previous changes (removing the branch in RenderObject::style() and inlining initForRegionStyling()) seem to be sufficient.

I think the path forward is to first change callers of RenderObject::style() to cache the pointer, then try to reland the patch and watch for regressions.