googlefonts
Specify `is_parametric` in axis metadata
Describe the issue
The pipeline is prepared to accept axis metadata with is_parametric.
optional bool is_parametric
We should add the corresponding field to the upstream proto definition and populate the field for all parametric axes. There are currently 9 as I understand it: x_opaque, x_transparent, x_transparent_figures, y_opaque, y_transparent_ascender, y_transparent_descender, y_transparent_figures, y_transparent_lowercase, and y_transparent_uppercase.
Hi, @nathan-williams. Could you help us gain more context about this new field? For example, what is the purpose and effect of adding it?
The only known use today is to inform axis ordering. For example, in a list of axes, we would want to show GRAD before XOPQ. This property has existed on our side for quite a while, but we realized just recently that the property was not being populated.
Let me know if I can support in identifying the parametric axes. They stand out pretty well among the existing axes if you know what to look for (i.e. axes with tags that match /(X|Y).../ more or less).
@davelab6 may be able to provide more insight into the definition of a parametric axis.