Add kitty graphics protocol support

[wookayin]

Work in progress. Upstream issue: #4

https://sw.kovidgoyal.net/kitty/graphics-protocol.html

• works on plain kitty terminal
  e.g. python -m imgcat FILENAME.png or imgcat(np.array(...))

• tmux support: it can print graphics, but they do not get cleared well

  • pixels per line information is missing, so it is quite difficult to allocate proper amount of spaces

• Support all parameters

/cc @teto

[ElPiloto]

Any chance this will get merged?

[wookayin]

I'll finish this soon. Thanks for bumping up!

[wookayin]

I can merge this soon, but it's really annoying (currently impossible) to make imgcat work well inside tmux. This is the limitation of kitty.

[wookayin]

tmux has now set -gq allow-passthrough on

This has nothing to do. This option is just for turning on the setting that is no longer default in tmux 3.3+; passthrough has existed since tmux v2. There is a limitation on the tmux passthrough buffer size, and what's worse is that how kitty deals with image artifacts inside a tmux is terrible. When the screen scrolling, the image will be stuck forever and never be deleted unless we send a clear signal.