Avoid calling calculateLayerBounds() and convertToLayerCoords() more than once per layer paint

[Simon Fraser (smfr)]

Avoid calling calculateLayerBounds() and convertToLayerCoords() more than once per layer paint

[Simon Fraser (smfr)]

Created attachment 173787 [details]
Patch

[Simon Fraser (smfr)]

http://trac.webkit.org/changeset/134356

[Ojan Vafai]

Hard to be sure it was this patch, but this looks like an improvement on a bunch of chromium perf bots. In theory, it could also be http://trac.webkit.org/changeset/134351, but that seems unlikely to me.

http://build.chromium.org/f/chromium/perf/chromium-rel-win7-webkit/dromaeo_jslibstylejquery/report.html?graph=jslib_style_jquery_jQuery____is__visible_&history=150&rev=167405

http://build.chromium.org/f/chromium/perf/chromium-rel-win7-webkit/dromaeo_jslibstylejquery/report.html?graph=jslib_style_jquery_jQuery____show__&history=150&rev=167405

http://build.chromium.org/f/chromium/perf/chromium-rel-win7-webkit/dromaeo_jslibstylejquery/report.html?graph=jslib_style_jquery_jQuery___height___x10&history=150&rev=167405

http://build.chromium.org/f/chromium/perf/chromium-rel-win7-webkit/dromaeo_jslibstylejquery/report.html?graph=jslib_style_jquery_jQuery___width___x10&history=150&rev=167405

http://build.chromium.org/f/chromium/perf/chromium-rel-win7-webkit/dromaeo_jslibstylejquery/report.html?graph=jslib_style_jquery_jQuery___css_color__x100&history=150&rev=167405

http://build.chromium.org/f/chromium/perf/mac-release-10.6-webkit-latest/dromaeo_jslibstylejquery/report.html?graph=jslib_style_jquery_jQuery___height___x10&history=150&rev=167405

[Simon Fraser (smfr)]

I would like to think that it was this patch!

[Radar WebKit Bug Importer]

<rdar://problem/12705357>