COLR fonts require GID 1 = .null

[djrrb]

(Posting this on behalf of Dwayne from MS, who very helpfully sent a couple issues my way. @RoelN may be interested.)

COLR fonts require that glyph id 1 is the .null glyph. Currently an Eth (D with slash) is allocated to that position which exhibits some bugginess in certain cases with apps.

https://www.microsoft.com/typography/otspec/colr.htm

Comparison with Segoe UI Emoji.

[RoelN]

@djrrb Do you have control over which character is mapped to which ID? This can easily be patched in a post processing script, but it's cleaner to do this in the source.

[davelab6]

Your GIDs seem to be randomly ordered. Where did that order come from?

[djrrb]

I'm not entirely sure why the COLR font's GID order differs from the other styles in the Bungee family or where it comes from exactly. I'm traveling this week but will try to reset it in the source (it means we'll have to re-do the post Robochrome changes). More soon...