Sixel encoder/decoder

[Nutzzz]

Especially now that Windows will be supporting Sixel in ConPty/Windows Terminal (Note Windows Terminal Canary supports it today, and it should be in mainline soon, probably in the next couple of weeks), perhaps an encoder/decoder could be added to ImageSharp? I'd really love it here, otherwise I'd have to either do a PInvoke of libsixel or switch to Magick.NET. Thanks!

[JimBobSquarePants]

That’s a pretty obscure format so we wouldn’t dedicate any time to supporting it any time soon. Perhaps via community contribution though.

[Nutzzz]

Sure, but that was my point; its obscurity has been partly due to the relative lack of support, which is changing.

I made a quick C# proof of concept that sort of works, but it currently only uses one color per 6-pixel high block (so it looks a bit like ANSI art). I'll try to continue developing it.

[JimBobSquarePants]

Ah that’s excellent! Are you using libsixel as reference?

https://github.com/saitoha/libsixel

The code there looks fairly readable.

[Nutzzz]

I used this "experimental" library in C# that turned out to be completely broken. My proof of concept was, for fun, attempting to fix it based only on the sixel Wikipedia article. As far as using libsixel (or chafa, perhaps) as reference... to the extent I'm good at any language, standard C ain't it.