SIXEL graphics support

[syu-id]

SIXEL is an image format that allows high-quality image display in terminal.
For detailed information, check libsixel repo and Wikipedia:

• https://github.com/saitoha/libsixel
• https://en.wikipedia.org/wiki/Sixel

As shown in the comparison below, it seems that sixel graphics are supported by SSH but not mosh.
The terminal emulator tested with is wsl-terminal v0.8.13, which is based on mintty. On Linux, mlterm also has sixel support out-of-the-box.

SSH

mosh

[ebetica]

I can confirm this on xterm compiled with sixel support as well. Would be amazing to have this!

[Heath123]

It would be good if mosh could compress the sixel image with PNG or something and maybe load it after the text so it doesn’t block text rendering

[achernya]

I'm afraid this feature request is extremely non-trivial. mosh's SSP (state synchronization protocol) would have to be substantially augmented to support large transfers of images. This is probably in the same amount of effort as port forwarding, or SSH agent support, in terms of the underlying features it requires.