In the example below, the bottom row are glyphs I’ve created as COLR, since their inside needs to be white (not transparent).
But the top row represents the offset I need to apply to each entry in the class. There are 13 different positions I need for these.
The red circled glyph is the one I used to create the inside. Do I need to create 13 instances of these, and then add each one?
I think it depends on the way it interacts with your OpenType layout features. It might be best to only have one, but if that makes your features too complex, then it might be wise to have multiple.
The only one I need is that simple glyph, white, to force the interior of the note to be white. What I need is for it to be shifted vertically in several different iterations, and I can’t figure that part out.
If I have the glyph created, how can I add it to those different locations?
Also, when I tried creating one, it seemed like it broke some things. You mentioned features. Does COLR cause complcations with other OpenType functions? If so, that’s not a new complexity I want to introduce. This font is already getting pretty complicated.