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pcwalton's profile
Patrick Walton
Patrick Walton
Patrick Walton
@pcwalton

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Patrick Walton

@pcwalton

Research engineer at Mozilla

San Francisco, CA
pcwalton.github.io
Joined November 2009

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    1. gankra's gay‏ @Gankra_ 30 Sep 2019
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      gankra's gay Retweeted gankra's gay

      If you're wondering how I learned all this junk, one of the first things I did at Mozilla (~3 years ago) was the integration between Firefox's and Webrender's text code. When I started, we basically didn't support text, and it took us quite a while to find and implement the caseshttps://twitter.com/Gankra_/status/1178093341663207424 …

      gankra's gay added,

      gankra's gay @Gankra_
      Text Rendering Hates You, a random collection of weird problems you need to deal with when rendering text: https://gankra.github.io/blah/text-hates-you/ …
      Show this thread
      1 reply 7 retweets 57 likes
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    2. gankra's gay‏ @Gankra_ 30 Sep 2019
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      You might think: oh well surely firefox has a lot of tests for that stuff, and you would be right! Firefox has an *impossibly large* amount of tests. Especially if your criteria is "any test that contains text". CI is useless when you break everything.

      2 replies 0 retweets 15 likes
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    3. gankra's gay‏ @Gankra_ 30 Sep 2019
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      The webrender bringup relied on two things: blob fallback, and "expected failure/fuzzy on wr" annotations on tests. The former is really cool, and is a total lifesaver! The latter meant we could find when we fixed things, and then make sure we didn't backslide.

      1 reply 0 retweets 8 likes
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    4. gankra's gay‏ @Gankra_ 30 Sep 2019
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      Blob fallback: every item has a CreateWebRenderCommands method which can *fail*. If it fails, it becomes an opaque texture that *the old renderer* draws and WR composites. So everything always "works", although slowly, and ugly. Everything fails to start, now make parts succeed.

      2 replies 0 retweets 8 likes
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    5. gankra's gay‏ @Gankra_ 30 Sep 2019
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      Text is really nasty because it's a single monolithic item and a *ton* of code. We still don't implement all of it. In the early days, when our CI usage was still spotty, we quickly found a lot of "interesting cases" and frequently broke them.

      1 reply 1 retweet 4 likes
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    6. gankra's gay‏ @Gankra_ 30 Sep 2019
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      To deal with this and to create a sort of living "checklist" of things to do, I created my Browser Text Stress Test, which is a huge page of "weird shit we need to deal with" (all browser render it differently): https://gankra.github.io/blah/webtests/text.html …

      3 replies 4 retweets 11 likes
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    7. gankra's gay‏ @Gankra_ 30 Sep 2019
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      My post talks about *maybe* half of the weird things happening on there. Largely because a lot of the cases that caused me trouble were related to decorations, shadows, and transforms, which are very "web" problems and not necessarily core to text rendering.

      1 reply 0 retweets 3 likes
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    8. gankra's gay‏ @Gankra_ 30 Sep 2019
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      As of today, there's only 5 things that will cause Webrender to give up on drawing a piece of text in Firefox: * Unserializable Fonts * Text-Combine-Upright Squishing * Text-Stroke * SVG Glyphs * Transparent Emoji Unclear when, if ever, we'll bother with thosepic.twitter.com/hfAo8prQ2y

      4 replies 2 retweets 12 likes
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      Patrick Walton‏ @pcwalton 30 Sep 2019
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      Replying to @Gankra_

      Might just be worth falling back to Pathfinder for those—basically just treating them as vector art.

      8:11 AM - 30 Sep 2019
      1 reply 0 retweets 0 likes
        1. gankra's gay‏ @Gankra_ 30 Sep 2019
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          Replying to @pcwalton

          Yeah 3 and 4 are """blocked""" on WR learning how to natively draw vector graphics. You already know I filed a bug on pathfinder for 2 :) 5 is just an "eat your vegetables" thing that isn't worth bothering with since slight quality/perf loss on transparent emoji is very "meh".

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