Monday, April 27, 2015

Performance Tracking (benjhayden)

• Preliminary LayoutAnalyzer-powered UMA findings. A few surprises

already, lots of opportunity for further analysis and more data.

• Working on LayoutTree trace object snapshots and various

LayoutAnalyzer improvements.

Scrolling (skobes) [crbug.com/417782]

• Reviewed bokan's RootFrameViewport change, and investigated a

background painting issue with root layer scrolling + slimming paint

(trchen is now working on a fix).

• Plan to work on testing root layer scrolling on Android this week.

Looking at failing layout tests related to fractional scroll offsets.

Line Boxes (szager) [crbug.com/321237]

• Continued work on line layout LayoutUnit conversions. Have a patch

that sets the barrier between float and LayoutUnit at the InlineBox

level, which seems like the sensible place.

• There is still a performance regression that I haven't been able to

eliminate. Was able to get some small performance wins by looking at

profiling data, but I've hit a wall with that approach. Will discuss

next steps and come up with a plan this week.

Flexbox (cbiesinger) [crbug.com/426898]

• More flexbox updates.

• Trying to get answers to flexbox spec questions, was promised answers

this week.

List marker refactoring (dsinclair) [crbug.com/370461]

• Working on performance of list marker code. New version is slower

then old version. html5-full-render on ToT was ~16.5 seconds for me,

with ListMarkerPseudoElement is ~17.5 seconds.

• Discussions this week on how to proceed with ListMarkerPseudoElement.

Misc Warden (dsinclair, pilgrim)

• Finishing work on decoratedName split, all annotations are moved

over, just finishing off rebaselines. (dsinclair)

• More renderer to layoutObject renames. (dsinclair)

• Wrapped up selection gap clipping rework. (wkorman)

• Working on slimming LayoutObject and pushing bits down to

descendants. (pilgrim)

Text (eae)

• Added unit tests for complex text shaping (eae)

Style resolution (rune)

• Working on type selectors for SVG in HTML documents and picking up

componentized style resolver work again. There is some question

about whether the SVG bug is worth fixing.

Region-based multi-column support (mstensho) [crbug.com/334335]

• Found a new crash. Maybe something changed on trunk. Will fix then

reenable multi-col.

Layout refactoring

• esprehn, ikilpatrick, cbiesinger, ojan, leviw working on coming up

with concrete proposals.