Question about layered color fonts

[Fonthausen]

If I understood it well, when you type text, the next glyph is set on ‘top’ by the text engine. So when you have an overlap, the next glyph sits/runs over the one before.

I would to know how this works for layered color fonts.

Example with one layer/color:

Does the layering work like this (option A) ? Layering per color.

Does the layering work like this (option B) ? Layering as a complete set of layers.

[GeorgSeifert]

Unfortunately it is the option B.

[Fonthausen]

I suspected as much, but would have preferred option A

[GeorgSeifert]

That would be much more useful. And I brought it up multiple times in tech meetings. But it is probably not going to happen (it would need too many changes to the drawing stack).