#wayland on 2024-05-31 — irc logs at oftc.irclog.whitequark.org

2023-04-28 11:16 ChanServ changed the topic of #wayland to: https://wayland.freedesktop.org | Discussion about the Wayland protocol and its implementations, plus libinput

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02:55 <wlb> wayland Merge request !397 opened by Joaquim Monteiro (jmonteiro) meson: Fix use of install_data() without specifying install_dir https://gitlab.freedesktop.org/wayland/wayland/-/merge_requests/397

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09:03 <nomanLLy> hi guys. i have a laptop and external monitor. i want to output of the monitor to be identical to the laptop. is this possible with wayland? in Xorg i used to do it with `xrandr --output HDMI-1 --same-as eDP1`

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09:28 <d_ed[m]> it is possible in wayland, the mechanism to do that depends on your desktop

09:28 <d_ed[m]> and is best to ask in the channel of your respective desktop (gnome, sway, etc.)

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11:34 <wlb> weston Issue #915 opened by Pekka Paalanen (pq) New output configuration design for the frontend https://gitlab.freedesktop.org/wayland/weston/-/issues/915 [Weston frontend], [Core compositor]

11:35 <wlb> wayland-protocols Merge request !318 opened by Simon Ser (emersion) readme: recommend using "Draft:" prefix for RFC protocols https://gitlab.freedesktop.org/wayland/wayland-protocols/-/merge_requests/318

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13:07 <pq> CTA-861-H section 5.3 Transfer Characteristic is really interesting... the default colorimetry seems to point to BT.709 TF which points to BT.1886 TF which uses gamma=2.4. Not 2.2. What am I missing?

13:08 <wlb> wayland Merge request !398 opened by Julian Orth (mahkoh) protocol: buffer storage must not be destroyed while in use https://gitlab.freedesktop.org/wayland/wayland/-/merge_requests/398

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13:10 <pq> 1 / 0.45 = 2.22, but that's the OETF, not assumed EOTF

13:18 <pq> hmm, maybe Colorimetry Transfer Characteristics table in CTA-861-H has a typo. The first row should be BT.709, not RGB.

13:19 <pq> because colorimetry = "no data" is a possibility, and colorimetry = BT.709 seems to be missing from the table.

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13:29 <vsyrjala> bt.709 is in row 6 with that other guy

13:29 <pq> huh, so it is

13:30 <pq> ooh

13:30 <pq> CTA-861-I has more rows!

13:30 <pq> so we have separate rows for RGB, sRGB, and defaultRGB now

13:30 <JEEB> yea, and thankfully CTA specs you can get for free as long as you fill in Trollgatan 32, Stockholm or something as your location and a@b.c as email

13:31 <JEEB> (or at least CTA-861 was such)

13:31 <pq> you mean one needs to fill in a form for no reason, yes

13:32 <JEEB> yup

13:32 <pq> rather than those are a secret hand-shake to drop the fees :-)

13:33 <JEEB> oh, they have added more validation to it now

13:33 <vsyrjala> and the fricking filename changes format every time!

13:33 <JEEB> at least requires a valid domain

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13:36 <JEEB> pq: I wish I knew the secret handshakes ;) I would otherwise have access to the IEC audio channel definition spec

13:40 <vsyrjala> hmm. defaultRGB seems to be a new thing. signalled via the ACE bits

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13:55 <pq> so defaultRGB is nothing about any default?

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13:56 <pq> uhhh, and sRGB also has explicit ACE bits

13:57 <pq> so, when Colorimetry says "No Data", which row of the Colorimetry Transfer Characteristics table applies?

13:58 <pq> the first one, RGB? which implies gamma 2.4?

14:02 <pq> have we been feeding sRGB images to gamma 2.4 displays all this HDMI and DP time?

14:04 <pq> or maybe "No Data" means "anything goes", and... the RGB row in the table is... useless?

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14:07 <zamundaaa[m]> Idk about the specs, but displays definitely do roughly gamma 2.2 if you measure them, not 2.4

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14:09 <pq> yeah, the spec confuses me

14:10 <vsyrjala> the spec seems to imply that section 5.1 should be defining some kind of default colorimetry for the "no data" case, but i see nothing like that there

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14:17 <vsyrjala> If the Colorimetry bits C0 and C1 in the AVI InfoFrame are

14:17 <vsyrjala> both zero (indicating “No Data”), then the transfer function shall be consistent with the

14:17 <vsyrjala> requirements in Section 5.1, “Default Encoding Parameters”.

14:17 <vsyrjala> but section 5.1 doesn't even mention the transfer function

14:17 <pq> \o/

14:18 <pq> can I hardcode "Assumed gamma 2.2" then?

14:21 <swick[m]> The "no data" case is really undefined, that's why we have defaultRGB which properly defines what the "no data" thing was supposed to be

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19:05 <vyivel> is input-timestamps-unstable-v1 used by any clients?

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