[MPEG-OTSPEC] [EXTERNAL] fvar and hoi updated

[Peter Constable]

Hi, Liam:

"The default (initial value) shall be taken from the non-hidden axis entry."

This doesn't make sense to me. Text can't be laid out or glyphs rasterized without a full specification of an instance. There isn't some initial state that layout or rasterization processing begins with that doesn't include an instance specification.

A statement I would expect but don't see is that normalization is calculated independently for each axis using its min/default/max values in conjunction with the "user" coordinate for each axis (clamped to the axis min/max range).


Peter

-----Original Message-----
From: mpeg-otspec <mpeg-otspec-bounces at lists.aau.at> On Behalf Of Liam R. E. Quin via mpeg-otspec
Sent: Wednesday, April 3, 2024 9:45 PM
To: MPEG OT Spec list <mpeg-otspec at lists.aau.at>
Subject: [EXTERNAL] [MPEG-OTSPEC] fvar and hoi updated

I keep thinking of koi carp for some reason.

https://github.com/harfbuzz/boring-expansion-spec/tree/main/iso_docs

The new text says what happens (based on what Harfbuzz does) if the min/max values for duplicated axisTags are different.

(scroll down past the list of files to get to WG03-fvar-2024-04.pdf and the Markdown and LibreOffice files)

liam


--
Liam Quin, https://www.delightfulcomputing.com/
Available for XML/Document/Information Architecture/XSLT/ XSL/XQuery/Web/Text Processing/A11Y training, work & consulting.
Barefoot Web-slave, antique illustrations:  http://www.fromoldbooks.org/
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