A couple more data points: - The most authoritative book on Thai font design I know of ( http://ftp.opentle.org/pub/national-fonts/FONTBOOK.PDF) addresses this issue on page 83. (The illustration shows their recommended solution, which won't be quite enough for this case, I suspect). (Also see page 76 for an illustration showing how to deal with PHINTHU below DO CHADA and TO PATAK.)
- It's common in Thai newspapers headlines (which are set with little leading) to have a vertically compressed DO CHADA and TO PATAK that do not extend below the baseline (e.g. http://www.thairath.co.th/media/IKbPejy4R5wTSf48k65QNeuVpZN.jpg) So one reasonable solution would be to use such a glyph with a normal SARA U or UU (similar to what Ed suggested). I agree with Martin that the current solution looks bizarre. James On Fri, Nov 14, 2014 at 1:37 AM, Jungshik SHIN (신정식) <jshin1...@gmail.com> wrote: > > IIRC, what's suggested by Ed was one of options we presented to our Thai > speaking reviewers along with what we currently have in Noto Sans Thai UI > [1]. Our reviewers preferred the current way of dealing with a vertical > metric constraint to what Ed suggested (squishing glyphs). > > We'll double check our record. > > Jungshik > > > [1] note that 'Noto Sans Thai' (for body/document) does not have this > issue. It's only 'Noto Sans Thai UI' that had to come up with a "novel" > solution > > On Tue, Nov 11, 2014 at 11:00 AM, Roozbeh Pournader <rooz...@google.com> > wrote: > >> With the latest HarfBuzz and Noto Sans Thai, I'm seeing the result I'm >> attaching, which appears correct to me (and the same as Android Kitkat >> result you've attached). >> >> But I see the same as what you are seeing on Android Lollipop. So this >> appears to be a bug somewhere in Android rather than HarfBuzz or Noto Sans. >> >> Please file a bug at https://source.android.com/source/report-bugs.html >> and send us a link to it. Thanks. >> >> On Tue, Nov 11, 2014 at 8:59 AM, Ed Trager <ed.tra...@gmail.com> wrote: >> >>> Hi, >>> >>> To the best of my knowledge, it seems extremely unlikely that U+0E0E >>> THAI CHARACTER DO CHADA would have U+0E39 THAI CHARACTER SARA UU ( >>> or U+0E38 THAI CHARACTER SARA U for that matter ) appear below it. >>> >>> I can't think of any Central Thai words that would have that kind of >>> spelling; and it seems even more unlikely that any of the minority >>> languages would use DO CHADA at all. >>> >>> Therefore, it seems very likely that the font designers did not specify >>> an anchoring position point for SARA U or SARA UU appearing below >>> consonants such as DO CHADA or U+0E0F THAI CHARACTER TO PATAK. >>> >>> - Ed >>> >>> >>> On Mon, Nov 10, 2014 at 10:16 PM, Nguyễn Đức An <annd1...@gmail.com> >>> wrote: >>> >>>> Dear Harfbuzz developers, >>>> We have an issue with Thai text render in Android L. When input U+0E0E >>>> and U+0E39, it displays wrong (please see the attach screen). >>>> I checked Thai Noto font (Google font) and Samsung Thai (Samsung font), >>>> issue happens with both of them. >>>> As i read the source of Harfbuzz, Thai reshaping only does separate >>>> SARA AM to NIKHAHIT & SARAA. So maybe the problem is not came from >>>> Harfbuzz. >>>> Any help is welcome. >>>> Thank you. >>>> >>>> _______________________________________________ >>>> HarfBuzz mailing list >>>> HarfBuzz@lists.freedesktop.org >>>> http://lists.freedesktop.org/mailman/listinfo/harfbuzz >>>> >>>> >>> >>> _______________________________________________ >>> HarfBuzz mailing list >>> HarfBuzz@lists.freedesktop.org >>> http://lists.freedesktop.org/mailman/listinfo/harfbuzz >>> >>> >> >> _______________________________________________ >> HarfBuzz mailing list >> HarfBuzz@lists.freedesktop.org >> http://lists.freedesktop.org/mailman/listinfo/harfbuzz >> >> > > _______________________________________________ > HarfBuzz mailing list > HarfBuzz@lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/harfbuzz > >
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