Layout Team Weekly Snippets - October 16, 2017
Emil A Eklund
https://docs.google.com/document/d/1ci6s93m4r0bcuGHkVbyZ_VnVoOsUJsRjggwnZvbfuO8/edit
Please make sure it lists appropiate OKRs for you by the end of the day *today*!
Updates since October 9:
- Implemented hit testing for LayoutNG by walking the fragment tree to
find the element(s) for a given point. Implements the nodeAtPoint API
and supports crossing between legacy layout and LayoutNG.
- Started working on updating fragment painting to use the correct
paint order. Requires changes to how fragments are represented as the
type of fragment may dictate the paint order (e.x. inline blocks and
floats paint in different phases than other elements).
- Finishing up Q4 planning.
- 2018 planning.
This week:
- Finish paint order patch.
- Finishing up Q4 planning.
- 2018 planning.
As for discussion topics for tomorrows meeting I offer the following
suggestions:
- Caching in LayoutNG.
- Triggering prepare-layout on DOM changes only.
- Exposing more fine-grained layout information in tracing.
Please reply-all with your own update for last week and also indicate
if any of the proposed topics sounds interesting to you or if you have
another one you'd like to add to the agenda.
Philip Rogers
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Steve Kobes
Xiaocheng Hu
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Aleks Totic
Last week was spent making LayoutTests better, some abspos, and minor ResizeObserver work.
# LayoutTests
test-expectations got a added text filter, and a progress bar 715336. I also have an oustanding CL to add flagging. With this CL, test-expectations will reach feature parity with results.html. The hope is that infra will be able to default to test-expectations, and my work here will be done.
I've added --skip-timeouts flag to run-webkit-tests. This flag has cut down the run time of complete local test suite from 20m to 8m. 710755
I've fixed an outstanding bug to make svg tests run in 800x600. The hope was that this would enable tests to be run faster in fully parallel mode. The speedup did not happen, but I got the peer bonus from pdr :-)
# Absolute positioning
Fix border writing mode mixup 709946
Made progress in always adding OOF children to Legacy. Hope to land this week, after I fix some unit tests. The interesting outstanding issue is that tests used to call NGBlockNode::Layout directly. This no longer works with OOF blocks, because now Legacy code also runs, which DCHECKs(IsInPerformLayout). This fails, because we are not doing legacy layout cycle.
# ResizeObserver
Got more feedback, and one more LGTM. One to go.
There was a lot of discussion about event vs. observer pattern. I need to summarize all the feedback, and call a meeting where we can make a decision (suggestion by dimitri).
Aleks
Yoichi Osato
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