Add block-image feature which forces rendering images using half blocks

[m-torhan]

spotify-player with enabled image cannot run in zellij in kitty - it hangs on viuer::get_kitty_support(). To enable running spotify-player in zellij I added feature block-image which forces rendering images using half-blocks.

[aome510]

spotify-player with enabled image cannot run in zellij in kitty - it hangs on viuer::get_kitty_support(). To enable running spotify-player in zellij I added feature block-image which forces rendering images using half-blocks.

Does it work in kitty outside zellij or in kitty inside other terminal multiplexers like tmux? It might be zellij bug.

That said, I found it weird to add an additional feature to force rendering images as ascii blocks. Is it better to not use image feature instead of using one with block rendering?

[m-torhan]

@aome510 it works well in kitty outside zellij (render full-res image). In tmux however it renders images using half-blocks, because the viuer::get_kitty_support() does not detect kitty.

I think having option to render images with ascii blocks when full-res is not available would be nice. I found a workaround for that without any changes in code - simply set TERM env var to anything and run spotify-player, so if you think this feature is not a good idea, feel free to close this PR.

[aome510]

Glad that you find a workaround. IMO, the issue is zellij-specific, so it should be fixed from that side. Adding a separate feature on top of image to render ascii blocks, which is the "fallback" option if no full-res option is available, feels kinda hacky to me.

I'll close this PR for now. Thanks for raising the issue and taking time to implement this though.