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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
      • Report Tweet
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      Replying to @nothings @rocallahan

      Emoji are weird here because they only(?) ligaturize with zwj glue and are a single EGC, so the user has to explicitly request the ligature, and that's ~always with a keyboard/editor that does it automatically. So it's really hard to get a mid-emoji style change in your markup.

      2 replies 0 retweets 2 likes
    2. Sean Barrett‏ @nothings 30 Sep 2019
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      Replying to @Gankra_ @rocallahan

      Yeah, I don't mean the style change, I just mean the partial selection. And my point isn't about emoji but about ligatures... presumably you COULD have ligatures which don't have a simple left-right or top-down substructuring, much as emoji don't.

      1 reply 0 retweets 0 likes
    3. Sean Barrett‏ @nothings 30 Sep 2019
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      Replying to @nothings @Gankra_ @rocallahan

      Like, ideally ligature partial selection OUGHT to have been handled by info in the font from day one, but I guess truetype was originally just for printers and not screens, and then when it first hit screens nobody used ligatures. So the horse was out of the barn.

      2 replies 0 retweets 1 like
    4. gankra's gay‏ @Gankra_ 30 Sep 2019
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      Replying to @nothings @rocallahan

      Yeah we definitely mess it up in a few places. It would be good if fonts or unicode helped us make better decisions, but I think the benefits currently outweigh the problems. https://bugzilla.mozilla.org/show_bug.cgi?id=479829 …pic.twitter.com/aLg6WW1oEE

      2 replies 0 retweets 2 likes
    5. Robert O'Callahan‏ @rocallahan 30 Sep 2019
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      Replying to @Gankra_ @nothings

      That bug is fixable by reshaping to avoid ligatures crossing line boundaries. Tricky to do though. Selection, color styling, etc, can't be fixed that way, because they can't change layout.

      1 reply 0 retweets 0 likes
    6. Robert O'Callahan‏ @rocallahan 30 Sep 2019
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      Replying to @rocallahan @Gankra_ @nothings

      I guess what you really want is a model where each glyph is associated with a single character, so e.g. an ff ligature is drawn as two glyphs that fit together. I don't know if that's already expressible in OpenType.

      2 replies 0 retweets 0 likes
    7. Patrick Walton‏ @pcwalton 30 Sep 2019
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      Replying to @rocallahan @Gankra_ @nothings

      TrueType/OpenType have the notion of compound glyphs that are composed of stacks of other glyphs with affine transforms. But I think every renderer just macro-expands such glyphs in place right now instead of preserving that info for use by consumers.

      1 reply 0 retweets 0 likes
    8. Patrick Walton‏ @pcwalton 30 Sep 2019
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      Replying to @pcwalton @rocallahan and

      In theory one could allow selecting e.g. individual jamo in Hangul inside a single glyph by looking at the compound glyph structure.

      1 reply 0 retweets 1 like
    9. Patrick Walton‏ @pcwalton 30 Sep 2019
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      Replying to @pcwalton @rocallahan and

      Also, compound glyphs are represented by glyph IDs, not cmap entries, so you’d have to reverse-index the cmap in order to work out that, say, the individual subglyphs that make up the ff glyph happen to represent the character f. Doable but feels hacky.

      1 reply 0 retweets 0 likes
    10. Sean Barrett‏ @nothings 30 Sep 2019
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      Replying to @pcwalton @rocallahan @Gankra_

      The subglyphs wouldn't be normal fs, wouldn't they be f-like shapes that aren't in the cmap? I think you'd instead introduce a convention that if there are exactly n subglyphs for a ligature representing n characters, they're in the same order.

      1 reply 0 retweets 0 likes
      Patrick Walton‏ @pcwalton 30 Sep 2019
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      Replying to @nothings @rocallahan @Gankra_

      Yeah, or introduce a new table.

      5:52 PM - 30 Sep 2019
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      0 replies 0 retweets 1 like

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