On Ubuntu 21.04 with the Wayland graphics system, it doesn't work

[ghost]

I have done and redone all the steps indicated but nothing happens. Everything stays the same, it doesn't invert the colors

[zoltanp]

Hi, this tool does not work on Wayland, only on X11. It uses X11-specific functionality (more exactly: as far as I know xrandr is not available on Wayland, as its architecture is different from X11's.)

[SimoneAiello00]

Ah ok, thank u very much Zoltan, I din’t know, thank you

Da: Zoltan @.> Inviato: lunedì 18 ottobre 2021 22:55 A: @.> Cc: @.>; @.> Oggetto: Re: [zoltanp/xrandr-invert-colors] On Ubuntu 21.04 with the Wayland graphics system, it doesn't work (#24)

Hi, this tool does not work on Wayland, only on X11. It uses X11-specific functionality (more exactly: as far as I know xrandr is not available on Wayland, as its architecture is different from X11's.)

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[koo5]

there seems to be a comparable api: https://wayland.app/protocols/wlr-gamma-control-unstable-v1

[zoltanp]

Thanks, this looks like something usable for inverting colors on Wayland.

I've seen a few important details related to this API :

• " There can only be at most one gamma control object per output, which has exclusive access to this particular output. "
  • So at one point in time only one program can control the gamma. Not sure if the window manager / compositor counts here.
• zwlr_gamma_control_v1::destroy : " Destroys the gamma control object. If the object is still valid, this restores the original gamma tables. "
  • If the program controlling the gamma stops/exits, then the gamma value is restored. Thus the program controlling the gamma has to run as a background application / service.