Build variable fonts for Google Fonts

simoncozens commented 2 weeks ago

This PR allows for the existing fonts to be built as variable fonts using a libre toolchain, a requirement for upgrading the fonts on Google Fonts. This was done by:

Inverting the axis mapping in the .glyphs source file, as detailed in #73.
Developing functionality within the babelfont font source translator to "bake in" Glyphs custom parameters such as "Remove Glyphs" and "Replace Features".
Automatically generating transformed versions of Cormorant Infant, Cormorant Unicase and Cormorant Garamond sources using babelfont
Compiling these generated sources with gftools-builder. A Makefile is included which sets up the Python virtual environment, rebuilds the sources files and calls gftools-builder.

Note that we store the generated sources in the repository so that the fonts can be recompiled at a later date only using a builder process with access to the repo contents.

Will be used to fix https://github.com/google/fonts/issues/8449.

simoncozens commented 3 days ago

@CatharsisFonts Any thoughts on merging this? We'd love to upgrade to variable fonts and to bring in the latest fixes.

CatharsisFonts commented 3 days ago

Hi @simoncozens, sorry for the delay, I didn't have time to look into the details. I'll just accept the PR as-is. Cheers, Christian

simoncozens commented 3 days ago

Thanks very much!

CatharsisFonts / Cormorant

Build variable fonts for Google Fonts #75