iconvg

IconVG was looking promising but it seems abandoned at this point... The README doesn't mention anything and the repo isn't archived, but the last real commit is from 3+ years ago https://github.com/google/iconvg

IconVG author here. Happy to discuss. Animation is issue #2 on https://github.com/google/iconvg and I have some ideas but no code yet. I'm also midway through changing the current "version 0" format into a "version 1" format, dropping things like the ArcTo op (inspired by SVG) precisely with one eye on (future) animation support. The ArcTo large-arc-flag, like any boolean-typed value, is impossible to interpolate smoothly.

https://github.com/google/iconvg/blob/main/spec/iconvg-spec.... also doesn't explain what relative cubeTo does, though from the context (2D vector graphics), “relative” must mean the co-ordinates are relative to the position of the cursor (as opposed to “absolute” which is relative to some fixed origin), and “cube” probably refers to cubic interpolation.

I wonder how it compares in terms of compression and features to Microsoft's font format extension that lets you use multiple layers with different colours, which is how Windows 10's emoji work. I remember a criticism of it was that flat design is the only possible design. IconVG seems to at least support gradients, based on what https://github.com/google/iconvg/blob/main/spec/iconvg-spec.... says. Incidentally, Microsoft have some other vector formats like WMF/EMF. I assume those are also more efficient than SVG?