How to set correct colorspace (RGB/BGR/etc.)? about docs HOT 4 CLOSED

Thanks! I'll close the issue so it doesn't keep around, and will research the reason of this not working as I think it should.
I'll post back if I ever find the correct way of doing this.

from docs.

Use drmModeAddFB2() (see modeset-atomic.c for an example). This call allows specifying the encoding (well, also the color-space in a sense, but not exactly, since sRGB and friends need further configuration).

from docs.

This call allows specifying the encoding (well, also the color-space in a sense, but not exactly, since sRGB and friends need further configuration).

The issue is that I don't always know the correct encoding/colorspace beforehand, the idea is to find it out using any other drm api if it exists
For example, using fbdev, you could know it by checking the red/green/blue offsets

from docs.

I think the idea is that you specify which one to use and the hardware adapts, not the other way around. However, there is likely a way to query the crtc/encoders for the supported four-cc codes, but I am currently not sure about it. I recommend checking what the existing compositors do and how they decide what to use as argument to drmModeAddFB2.

from docs.