SIMD optimizations

[markg85]

Hi,

I'm not the author! Just to get that out of the way :)
I just found this repo: https://github.com/chocolate42/qoi-simd

Just thought i'd share it here. Some of it's optimizations might make sense to implement in this library too. Given the speedups that repo has achieved (3x faster encode compared to QOI), probably worth it to at least have a look. I looked over some code too. It is doing a little more then just making it faster, it changed the format a little too. Still, the code has lots of optimizations gems you might like that are just one copy/paste away!

This is an awesome project! It's impressive how you've been able to make such a fast image format! The rust png crate apparently (reddit post) took that personal and made it's png rival yours!

Best regards,
Mark