Monday, March 7, 2016

Updates since last meeting (on Monday, February 29): We had a new person join the meeting for the first time this morning, Aleks Totic (atotic). He join Google about two months ago and his starter project is Resize Observer. Welcome Aleks! Scrolling (skobes)

• Have a change in review that fixes a bunch of things with scroll anchoring, with this change it is pretty close to usable on real- world websites. (skobes)
• Smooth scrolling bugs (have four of them now, yay). (skobes)
• Reacquainted myself with scrolling stuff, was looking into a scroll related bug that skobes volunteered to take on. (szager) CSS Flexbox (cbiesinger)
• Worked on flexbox percentage sizing, going well. Will continue this week.
• Last week, re-landed the fix for scrolling that fixes everything after a fix by kojii that caused a revert (layout scheduling at a stage where one should not happen). CSS Grid Layout (svillar, jfernandez, rego, javif) [crbug.com/79180]
• No update since last week - CSS Multi-column (mstensho) [crbug.com/334335]
• No update since last week - CSS Houdini (ikilpatrick)
• Kast week in Waterloo with compositor worker folks, had fun getting compositor worker to work with worklets (that's a lot of work* words!) and with a cleaner API. Have a new API version, will try to move into trunk sometime later this month.
• About to commit a small change for main frame worklets API.
• Want to get paint rendering context 2d check-in this week. Add API for layout (leviw, pilgrim, dgrogan) [crbug.com/495288]
• Continued making progress on the box layout api, have sense of size of problem. Basically every element will have to have a layout item instead. About ~40% of them have their own element specific things which means that we'll need element specific block element API. Working through that list and figuring out the hierarchy. Projecting how large of a project it is. (pilgrim)
• So far most element specific APIs have been pretty small with only a method or two, on the leaf node level. a lot of the higher level elements (like layout image, layout media, layout box etc) have more complicated APIs that will take more time. (pilgrim)
• Spent much of last week burning down the list of tasks for the Line Layout API. Only size invalid calls left, hopeful then we can change the constructors and add include guards this week then call the Line Layout API done. (dgrogan) LayoutNG [crbug.com/591099]
• No update since last week - CSS Containment (leviw) [crbug.com/312978]
• Landed Layout Containment! https://codereview.chromium.org/1530303003 Intersection Observer (szager, mpb) [crbug.com/540528]
• Landed a couple of intersection observer changes last week, have a few more coming but no longer a full-time endeavor. (szager)
• Focus on bugs this week. (szager) Text (eae, drott, kojii)
• Coming back from tok, working on remaining on emoji font fallback. After coordinating with android team changed how we get the fallback font. When android releases the SDK preview for N then we can activate fitzpatrick modifiers. Required further segmentation fixes. (drott)
• Fixed line-breaking issues with emjoi combiners. Not yet in ICU, implemented on top of it for now. Will move to ICU over time. (drott)
• This week, plan to add unit tests for line breaking and then land and coordinate with Android team. (drott)
• Fixed how we query the operating system for font settings relating to font smoothing and LCD subpixel rendering on Windows. Previously we tried to read the registry values from the rendering which wouldn't work with the sandbox lockdown, changed it to query the OS from the browser process and pass it down to the renderer. Fixes issues where we don't respect the users font settings and also ensures consistency across chrome and blink. (eae)
• Discovered a pretty bad perf regression for break-all. Our performance has always been bad but got worse with complex text. Investigating and have some ideas as to how it can be fixed. (eae) HTML Tables (dgrogan)
• No update since last week - Misc
• Started working on how we render table backgrounds with collapsed borders, pulled a thread and the whole thing started to unravel. Discovered out that collapsed borders are painted in a crazy way, trying to clean up. (atotic)
• Spent a full day helping wkorman with the rebaseline bot, makes me realize how happy I am that I left infra and moved to blink where things are sane and predictable. (szager)
• Still dong analysis work for writing modes. (wkorman)