RE: Interpretation of OpenType MATH fraction shifts from Murray Sargent on 2019-08-06 (public-mathml4@w3.org from August 2019)

From: Murray Sargent <murrays@exchange.microsoft.com>
Date: Tue, 6 Aug 2019 17:47:38 +0000
To: Frédéric Wang <fwang@igalia.com>
CC: "public-mathml4@w3.org" <public-mathml4@w3.org>, Victor Kozyrev <victork@microsoft.com>, Sergey Malkin <sergeym@microsoft.com>, Peter Constable <petercon@microsoft.com>
Message-ID: <SN2PR00MB017571DFE07E7812889DEBF687D50@SN2PR00MB0175.namprd00.prod.outlook.com>

Looking at the LineServices math fraction handler code, I think the OpenType math table numerator shift-up and denominator shift-down parameters are relative to the math axis.

For confirmation, adding Victor, who wrote the math fraction handler code, Sergey, our OpenType math table expert, and Peter who has edited the OpenType math table spec.

Thanks,
Murray

-----Original Message-----
From: Frédéric Wang <fwang@igalia.com> 
Sent: Tuesday, August 6, 2019 7:53 AM
To: public-mathml4@w3.org; Murray Sargent <murrays@exchange.microsoft.com>
Subject: Interpretation of OpenType MATH fraction shifts

Hi Murray,

Can you please indicate whether numerator/denominator shifts should be relative to the fraction baseline:

https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fmathml-refresh%2Fmathml%2Fissues%2F123&amp;data=02%7C01%7Cmurrays%40exchange.microsoft.com%7C4b97f7caa10e4877df9608d71a7ddfd7%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637007000246191836&amp;sdata=MbBg9KD4l2thIkbyGU5gZOU7lnhiUO0OXxRasVaGFb4%3D&amp;reserved=0


Thanks,

--
Frédéric Wang

Received on Tuesday, 6 August 2019 17:48:06 UTC