Inverted colors with picom GLX backend

[ViniiR]

doesn't seem to be an issue with rofi itself but versions 1.7.5 and 1.7.9 have been tested

I'd just like to ask a question because rofi is the only affected program after I updated NixOS, what could be causing this issue?:

lv_0_20250613180156.mp4

(picom is automatically restarted after a few seconds)
(I also must say that everything worked perfectly fine before the NixOS update)

[DaveDavenport]

related to #2140?

[ViniiR]

it only happens with the GLX backend specifically, when using xrender it works fine but well, no transparency, I'm taking a look into 2140 I'll see what I can do

[DaveDavenport]

I am interested if it finds the right visual here:

rofi/source/xcb.c

Line 1822 in 57edcb4

static void x11_create_visual_and_colormap(void) {

or it falls back to just copy the root window one..

[ViniiR]

sorry for the very late reply, yes it seems it is indeed using BGR instead of RGB now, although the images are still reversed (not all of for some reason?)
in your piece of C code what exactly did you mean?

[ViniiR]

update: after removing "Intel" from nixos'
services.xserver.videoDrivers the issue seems to be fixed.

services.xserver.videoDrivers =[
          "intel"
          "modesetting"
];

now:

services.xserver.videoDrivers =[
          "modesetting"
];

this was apparently introduced in nixpkgs 24.11 and only affected Rofi but only if picom was running with GLX backend

[DaveDavenport]

I would like to reproduce it still, I can probably fix it, if I now I get an BGR surface we should be able to compensate.

[ViniiR]

I'm still wondering what you meant by that piece of C code, how could I help?

[ViniiR]

don't know how useful this can be but since it seems to be a GPU drivers issue here's all my info
I got a Samsung book laptop exact model "550XDA-KT1"
CPU i3-1115G4
GPU is integrated
I'm not exactly sure my drivers version but they're being pulled from nixpkgs 25.05, exact flake URL:

nixpkgs = {
      url = "github:nixos/nixpkgs/fd487183437963a59ba763c0cc4f27e3447dd6dd";
};