[MPEG-OTSPEC] [EXTERNAL] RE: FYI: OpenType 1.9 beta

[Peter Constable]

Vlad:

I think I’d consider the structural changes to be editorial in nature. (E.g., conformance was not affected by those changes.) Of course, they were not minor edits.

All of the changes to the OT spec not reflected in Amd 2 were addressing a number of issues reported against the spec:

1.8.4: Issues · MicrosoftDocs/typography-issues (github.com)<https://github.com/MicrosoftDocs/typography-issues/issues?q=is%3Aissue+milestone%3A%22OpenType+1.8.4%22> (count: 236)
Post 1.8.4 errata: Issues · MicrosoftDocs/typography-issues (github.com)<https://github.com/MicrosoftDocs/typography-issues/issues?q=is%3Aissue+milestone%3A%22OpenType+1.8.4+erratum%22> (count: 2)
1.9: Issues · MicrosoftDocs/typography-issues (github.com)<https://github.com/MicrosoftDocs/typography-issues/issues?q=is%3Aissue+milestone%3A%22OpenType+1.9%22> (count: 56)

How would you suggest I compile an input contribution for all of that?

From: Vladimir Levantovsky <vladimir.levantovsky at gmail.com>
Date: Monday, March 28, 2022 at 2:00 PM
To: Peter Constable <pconstable at microsoft.com>, 'MPEG OT Spec list' <mpeg-otspec at lists.aau.at>
Subject: [EXTERNAL] RE: [MPEG-OTSPEC] FYI: OpenType 1.9 beta
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 second version of the COLR table<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftypedrawers.com%2Fhome%2Fleaving%3FallowTrusted%3D1%26target%3Dhttps%253A%252F%252Fdocs.microsoft.com%252Fen-us%252Ftypography%252Fopentype%252Fotspec190%252Fcolr&data=04%7C01%7Cpconstable%40microsoft.com%7C44a24a60579748cacaf808da10fe0900%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637840980506995200%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=TRv5svwJ7%2BwmMvmYUEU3CkPmDdf%2FkC9tj8R73VxTIMg%3D&reserved=0> (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 Chrome Canary<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftypedrawers.com%2Fhome%2Fleaving%3FallowTrusted%3D1%26target%3Dhttps%253A%252F%252Fwww.google.com%252Fchrome%252Fcanary%252F&data=04%7C01%7Cpconstable%40microsoft.com%7C44a24a60579748cacaf808da10fe0900%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637840980506995200%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=%2Bpugt41vqAup2MfPxn7JPbRr2nvYTOrXSThS0W%2FxR8g%3D&reserved=0> 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://github.com/googlefonts/color-fonts<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftypedrawers.com%2Fhome%2Fleaving%3FallowTrusted%3D1%26target%3Dhttps%253A%252F%252Fgithub.com%252Fgooglefonts%252Fcolor-fonts&data=04%7C01%7Cpconstable%40microsoft.com%7C44a24a60579748cacaf808da10fe0900%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637840980506995200%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=ft5l1GvQxa9eHWTAKde7HYQ4cTlgR38Iw453DWvOEsc%3D&reserved=0>.

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://docs.microsoft.com/typography/opentype/otspec190/ot190beta<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftypedrawers.com%2Fhome%2Fleaving%3FallowTrusted%3D1%26target%3Dhttps%253A%252F%252Fdocs.microsoft.com%252Ftypography%252Fopentype%252Fotspec190%252Fot190beta&data=04%7C01%7Cpconstable%40microsoft.com%7C44a24a60579748cacaf808da10fe0900%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637840980506995200%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=7PzxHo%2BcQDDvg0tuFg56aoQI3iU9G5ybWazm6yszjT4%3D&reserved=0>. 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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