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Source Han Serif | 思源宋体 | 思源宋體 | 思源宋體 香港 | 源ノ明朝 | 본명조
https://adobe.ly/SourceHanSerif
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Fullwidth Parenthesis after Fullwidth Latin character in vertical writing displayed in horizontal form #62

Closed bobbytung closed 7 years ago

bobbytung commented 7 years ago

It's an interesting issue.

I use Source Han Serif (TW subset) as embedded font to try typography for Google Play Books. Every Full width parenthesis (i.e. [（] U+FF08、[）] U+FF09) that after Fullwidth latin character in vertical writing will fallback to horizontal form.

sample 1 : Line 2 [（] after NGO sample 2 : Line 3 [）] after NLD

It might be Google Play Book's issue. But it works fine with Source Han Sans (system font in Android 7).

kenlunde commented 7 years ago

Given that the issue appears in particular contexts, and given that the affected glyphs are not covered by any of the contextual OpenType features, it is most definitely a Google Play Book issue. This issue seems related to text runs and how HarfBuzz (cc @behdad) performs certain optimizations on all of the glyphs for a particular text run, which is likely preventing the 'vert' GSUB feature from being applied. The full-width parentheses are likely part of the text run that includes the full-width Latin.

The different behavior between Source Han Sans and Source Han Serif is likely due to other reasons, perhaps a bit of hard-wiring on the part of Google.

Have you tried the non-subset version?

behdad commented 7 years ago

Yes that sounds like itemization issue, specific to certain implementations, not the font.