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varLib "IUP" delta optimization as an optional feature instead of on by default

See original GitHub issue

Some variable font implementations seem to have problems drawing glyphs that have “IUP” delta optimizations.

Currently, _add_gvar() sets the optimize option to be True as a default, but the API for disabling optimization could be easier to get to if the option was available as an argument of the build() method as well.

https://github.com/fonttools/fonttools/blob/3fbc4688eb5ef1057c58ae8bc12a1ba0b59b12d5/Lib/fontTools/varLib/__init__.py#L656

Issue Analytics

State:
Created 6 years ago
Comments:13 (6 by maintainers)

Top GitHub Comments

1reaction

anthrotypecommented, Nov 15, 2017

I’m going ahead and set optimize=False by default for now until Adobe apps will ship a fix. I will also add a -O (or --optimize) option to fontTools varLib console script so that “advanced” users can optionally turn it on with their interpolatable ttfs.

If anybody prefers a different solution, please speak up now.

1reaction

jenskutilekcommented, Oct 25, 2017

Yes, I sent a bug report with a demo font.

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