June easter egg can cause flicking

[row454]

Describe the bug

The June easter egg can cause significant flickering in some terminals. It occurred for me in both ghostty and tty1, but not in alacritty. This is a risk for people with photosensitivity.

• Does this issue still occur in the master branch? (Required)

Expected behavior

No flickering.

Screenshots

Please include a screenshot of your system information if the specific system environment is relevant to the bug.

If applicable, add screenshots to help explain your problem.

Config file

Please paste the content of ~/.config/hyfetch.json below:

{
    "preset": "nonbinary",
    "mode": "rgb",
    "light_dark": "dark",
    "lightness": 0.5,
    "color_align": {
        "mode": "custom",
        "custom_colors": {
            "1": 0,
            "2": 2
        },
        "fore_back": []
    },
    "backend": "fastfetch",
    "args": null,
    "distro": null,
    "pride_month_shown": [],
    "pride_month_disable": false
}

Additional context

Add any other context about the problem here.

Flickering is due to bugs in Terminal, unrelated to hyfetch project. Any terminal software may flicker....

[row454]

It happened on tty1, though, so it feels more like the way hyfetch does things cause flickering.

[hykilpikonna]

Right this might be a serious issue that I haven't thought about...

Most modern terminals will not flicker (even electron ones like Hyper renders it well). So I think the solution might be to make a blacklist of terminals that do not support it?

It happened on tty1, though, so it feels more like the way hyfetch does things cause flickering.

Linux built-in framebuffer tty is quite old and doesn't even support 8-bit colors without tweaking, let alone ANSI truecolor and fast gpu-accelerated rendering...

[hykilpikonna]

Okay but then it also depends, like even if you're using a fast terminal e.g. alacritty but in a slow ssh connection, it might flicker as well... so I guess I should just add a photosensitivity warning screen?

[leumasme]

Confirm: Flickers noticably on Ubuntu 24.04 with default terminal ("Terminal" application, bash, $TERM=xterm-256color) and no relevant customization, roughly the bottom 50-20% on 43x184 char terminal size.
I'm not sure this is significant to where it would actually be a photosensitivity risk, but its irritating at least

[FractalGeodes]

We encounter flickering on Windows Terminal (we're on Windows 10 currently, but I think I remember it happening on Windows 11 as well. There's a few computers lying around that I can test on though if needed)

[hykilpikonna]

Okay I found a solution that absolutely solves this without any compromise: simply not clearing the screen every frame lmao

It seems like ansi lets me overwrite what's already there without clearing the screen if I simply move the cursor to the top right using \x1B[H every frame.

It would be wiggly since terms don't have vsync yet but at least not flickery.

So this is fixed!