Here's a fun rabbit hole. I wanted to request the GNOME Backgrounds (wallpapers) to switch to JPEG XL as their default universal format, to save a lot of space everywhere, because I wanted that to trickle down to Fedora and such, however... the ticket was closed as not being possible at the moment.

So when you dig around from there, you find this (which doesn't tell us why webp was picked), this which points to this previous attempt at adding libjxl to GNOME OS' core-deps... which points right back here at issue #865.

However, reading all those, it was still a bit unclear to me what the situation was, so I asked for clarifications in #gnome-hackers and here are some answers I got:

A: "It was a pain to add jpeg-xl support in GNOME OS, [as] it hard depends on skia. Someone would need to figure out how to build skia on our end"

M: "Hard -1 from me, we should not accept a dependency on skia. Not unless skia decides to become a shared library. It's just too inconsistent with the rest of the platform."

M: "It looks like libjxl is OK because it can be built with lcms instead of skcms, but the jxl gdk-pixbuf loader that you need for wallpapers really does hard depend on skcms"

M: "lcms2 is already a dep of GNOME and it is a shared lib, switching to that looks like a good idea"