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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. Robert O'Callahan‏ @rocallahan 29 Sep 2019
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      Replying to @Gankra_

      FWIW Chrome 79-dev Linux renders partial ligatures the same way Firefox does. As the "someone" accused of being enthusiastic here: you need some kind of partial ligature rendering to render partially-selected ligatures, which I still maintain is worth doing.

      3 replies 0 retweets 14 likes
    2. Robert O'Callahan‏ @rocallahan 29 Sep 2019
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      Replying to @rocallahan @Gankra_

      As the "someone" also behind component alpha, the rationale was without it, we would have had quite significant visual regressions when we introduced layers for text (especially in Windows XP where proper Cleartype rendering was really important and expected by users).

      1 reply 0 retweets 3 likes
    3. Robert O'Callahan‏ @rocallahan 29 Sep 2019
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      Replying to @rocallahan @Gankra_

      As for SVG fonts, for which I am also largely responsible: I guess demand for fancier glyphs than those supported by COLR hasn't really emerged, so mea culpa.

      3 replies 0 retweets 4 likes
    4. Robert O'Callahan‏ @rocallahan 29 Sep 2019
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      Replying to @rocallahan @Gankra_

      If and when it does, I hope people just use SVG instead of redesigning SVG as OpenType features one feature at a time.

      1 reply 0 retweets 2 likes
    5. Robert O'Callahan‏ @rocallahan 29 Sep 2019
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      Replying to @rocallahan @Gankra_

      And FWIW there is no need to be discreet by repeatedly referring to "someone" :-)

      1 reply 0 retweets 3 likes
    6. Robert O'Callahan‏ @rocallahan 29 Sep 2019
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      Replying to @rocallahan @Gankra_

      Great post by the way.

      1 reply 0 retweets 2 likes
    7. gankra's gay‏ @Gankra_ 29 Sep 2019
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      Replying to @rocallahan

      I mean, for partial-ligatures I linked your post on it, so I wasn't obscuring anything. The others I genuinely wasn't sure it was you (although they all have the a distinct "roc went on an adventure" signature).

      1 reply 0 retweets 6 likes
    8. gankra's gay‏ @Gankra_ 29 Sep 2019
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      Replying to @Gankra_ @rocallahan

      Everything I discussed except the the partial ligature work turned out to be a bad gamble, but they were reasonable considerations at the time. They stand out to me because they were bizarre friction points I ran into when bringing up webrender which no other browser did.

      1 reply 0 retweets 2 likes
    9. Robert O'Callahan‏ @rocallahan 29 Sep 2019
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      Replying to @Gankra_

      I don't see a clear case that component alpha was a "bad gamble". Its useful life probably ended a while ago but that doesn't necessarily mean it was net detrimental.

      1 reply 0 retweets 2 likes
    10. gankra's gay‏ @Gankra_ 29 Sep 2019
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      Replying to @rocallahan

      As we've pushed into high resolutions driven by relatively weak gpus, and pages have started producing more nasty layers, the extra memory/bandwidth footprint from component alpha appears to actually be causing problems. Also no one else ever bothered doing it, right?

      2 replies 0 retweets 2 likes
      Patrick Walton‏ @pcwalton 29 Sep 2019
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      Replying to @Gankra_ @rocallahan

      Is the extra memory/bandwidth from component alpha theoretically necessary or is it just a consequence of GL 3 blend modes being overly limited? (I forget how component alpha works)

      7:27 PM - 29 Sep 2019
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Patrick Walton‏ @pcwalton 29 Sep 2019
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          Replying to @pcwalton @Gankra_ @rocallahan

          It’s worth remembering that we in the browser space are in a weird situation where we can’t rely on anything past D3D9 level functionality which is from 2002 (!!) When I talk to game developers about this they’re often aghast.

          1 reply 1 retweet 8 likes
        3. Robert O'Callahan‏ @rocallahan 29 Sep 2019
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          Replying to @pcwalton @Gankra_

          Component alpha needs 6 bytes per pixel rather than 4. That's fundamental extra overhead. I don't remember how it's implemented in the GPU compositors.

          2 replies 0 retweets 1 like
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