[mpeg-OTspec] vhea table, sign of descender

[Levantovsky, Vladimir]

Thank you Hin-Tak for pointing out the discrepancy between the descriptive part of the vertTypoDescender spec and the example, I will add this proposed change to the current working draft amendment.

Thank you,
Vladimir


From: mpeg-OTspec at yahoogroups.com <mpeg-OTspec at yahoogroups.com> On Behalf Of Hin-Tak Leung htl10 at users.sourceforge.net [mpeg-OTspec]
Sent: Monday, October 29, 2018 7:50 PM
To: mpeg-otspec at yahoogroups.com; opentype-list at indx.co.uk
Subject: [mpeg-OTspec] vhea table, sign of descender



Hi,

I think one small part of the opentype spec probably needs to be reworded slightly. Recently I have an issue with HarBuzz doing strange values for Microsoft mincho for the descender in vhea.

Looking at ISO/IEC 14496-22:2015, section 5.7.7, in version 1.1 version of the table's "vertTypoDescender" description, it says "... For example, a font with an em of 1000 fUnits will set this field to 500".

Then in the next page, the example is "Minus half the em-square height".

I think in the first description a few "minus" and "-" should be added. Thus the anomaly with Microsoft mincho (its descender field in vhea has a +ve value...)

Hin-Tak




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