On Mon, 7 Apr 2025 14:44:25 +0300 Andrew Randrianasulu <randrianas...@gmail.com> wrote:
> пн, 7 апр. 2025 г., 14:19 Pekka Paalanen <pekka.paala...@haloniitty.fi>: > > > On Fri, 4 Apr 2025 22:14:10 +0300 > > Andrew Randrianasulu <randrianas...@gmail.com> wrote: > > > > > пт, 4 апр. 2025 г., 21:35 Andrea paz <gamberucci.and...@gmail.com>: > > > ... > > > > A theoretical question: can CinGG be adapted to work in Wayland or is > > > > it impossible? Has XWayland limitation? > > > > X11 and Wayland designs for color management are fundamentally > > incompatible. > > > > With X11, applications never tell the display server what kind of > > pixels they are producing or which, if any, color profile they used for > > the display. With Wayland, applications must describe their pixels to > > the display server. Since X11 applications tell nothing to the X server, > > Xwayland has no color information to forward to the Wayland compositor. > > > > There can be case-specific manual solutions, though, that rely on > > correctly configuring both the X11 apps and the Wayland compositor. X11 > > apps need to be configured to render for a specific display profile, > > and the Wayland compositor needs to assume the X11 windows are rendered > > for the same specific display profile. How that is actually done is up > > for each X11 app and each Wayland compositor. > > > > Is there possibility for X extension for Xwayland allowing relatively > simple way to tell Xwayland what to do with each window/region? Hi, sure, but would it not be more useful to invest that effort in a proper Wayland integration? X11 is fundamentally limited to max 32-bit pixels so its stuck at 30 bpc max with only 2 bits of alpha. That's probably the only thing that cannot be worked around. > A bit like > > https://github.com/oyranos-cms/oyranos/blob/master/libxcm/include/X11/Xcm/Xcm.h That's an interesting one, I wasn't aware of this. I have to take some statements back. So this is communicating ICC profiles and associated window regions to an X11 compositing manager. If a profile covers the whole window, this should be relatively easy to hook up in a Wayland compositor's XWM (embedded X11 window manager). Being limited to ICC profiles is a hindrance for HDR, although the CICP extension for ICC does exist. Unfortunately CICP does not carry everything we have in the Wayland color-management protocol extension. Most notably, it misses the reference white level which would be necessary[1]. Thanks, pq [1]: https://www.freelists.org/post/argyllcms/Standard-spec-for-ICC-file-that-can-be-used-for-HDR-calibration,1
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