[MPEG-OTSPEC] FYI: OpenType 1.9 beta

[Vladimir Levantovsky]

Peter, all,

 

I would like to note that a large number of substantial changes were made in
the two last updates of OpenType specification, versions 1.8.4 and 1.9.
While major updates (COLR v1) have been discussed and implemented in both OT
and OFF texts, there are many additional changes that introduced text
updates that go beyond merely editorial changes. Some parts of the OT spec
were subjected to restructuring that, although they did not introduce
technical changes, caused significant deviation in the language of the
current OT chapters and OFF text. 

 

In order to implement these changes and synchronize the text of the 5th
edition Working Draft OFF text with OT 1.8.4 and 1.9 updates, the updates
will need to be submitted as input contributions.

 

Thank you,

Vladimir

 

 

From: mpeg-otspec [mailto:mpeg-otspec-bounces at lists.aau.at] On Behalf Of
Peter Constable
Sent: Friday, November 12, 2021 1:31 AM
To: 'MPEG OT Spec list' <mpeg-otspec at lists.aau.at>
Subject: [MPEG-OTSPEC] FYI: OpenType 1.9 beta

 

A beta for OpenType 1.9 has been published for two-week public review. This
version aligns to the CDAM of OFF Amendment 2 with the introduction of a
significant enhancement for colour fonts: a
<https://typedrawers.com/home/leaving?allowTrusted=1&target=https%3A%2F%2Fdo
cs.microsoft.com%2Fen-us%2Ftypography%2Fopentype%2Fotspec190%2Fcolr> second
version of the COLR table (version 1). 

 

The new COLR version provide support for gradients and other capabilities in
vector colour fonts; the capabilities are very similar to those in SVG
Native but can be used in applications that do not have or (for whatever
reasons) cannot add support SVG. The new COLR version also provides greater
integration with font variations-something that is not supported at all with
OT-SVG. The COLR enhancements were designed jointly with Google, who have
been implementing support in the FontTools project, the Skia and Freetype
libraries, and in Chrome. It can be tested already in the
<https://typedrawers.com/home/leaving?allowTrusted=1&target=https%3A%2F%2Fww
w.google.com%2Fchrome%2Fcanary%2F> Chrome Canary builds by browsing to
chrome://flags/#colr-v1-fonts to enable the feature. Sample fonts using COLR
v1 (with OT-SVG equivalents for comparison) are available at
<https://typedrawers.com/home/leaving?allowTrusted=1&target=https%3A%2F%2Fgi
thub.com%2Fgooglefonts%2Fcolor-fonts>
https://github.com/googlefonts/color-fonts. 

OpenType 1.9 also addresses a number of feedback items that have been
reported on the OpenType spec. Among the more significant technical
improvements are clarifications of several items related to TrueType
outlines and the TrueType hinting language. These are changes that will be
submitted to SC29 as proposed changes for a new edition of OFF.

The landing page for the beta is at
<https://typedrawers.com/home/leaving?allowTrusted=1&target=https%3A%2F%2Fdo
cs.microsoft.com%2Ftypography%2Fopentype%2Fotspec190%2Fot190beta>
https://docs.microsoft.com/typography/opentype/otspec190/ot190beta. The
public review period will end November 26, and the new OT version will be
published shortly after that.

 

 

Peter Constable

 

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