[MPEG-OTSPEC] Discrepancies between OpenType Japanese fonts and OT spec

[木田泰夫]

Hello Vladimir and all,

In the last few months, we noticed discrepancies between how CFF-based OpenType Japanese fonts have been implemented for these 20+ years and what OpenType/Open Font Format specification says. Two examples so far are kern (should be default off for fullwidth characters) and VORG (mandatory for CFF-based OT fonts), but there might be more. Most likely, the issue is common to Chinese CFF-based OT fonts and possibly Korean.

I hope they will be fixed in the upcoming release.

We started a team in CITPC <https://moji.or.jp/>, with help from Nat/Taro at Adobe, to go through all tables in C/J fonts to find out if there are any other similar issues. We could either propose changes individually as we find them or wait until the investigation is complete and submit a proposal covering all known issues.

I am leaning toward the piecemeal approach, but I would appreciate it if you could advise me on how we should move forward.

Thank you and best,

- kida


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