Bug 301850 – [GStreamer][GL] HDR10 tone mapping missing

• Status: RESOLVED
• Resolution: FIXED
• Component: Platform

[Philippe Normand]

We currently hardcode sRGB:

DestinationColorSpace MediaPlayerPrivateGStreamer::colorSpace()
{
    return DestinationColorSpace::SRGB();
}

Also our compositor doesn't handle GST_VIDEO_COLORIMETRY_BT2100_PQ.

[Philippe Normand]

The are likely other things to fix :) We'd probably need some UIProcess/WebProcess IPC to query the monitor capabilities too.

[Carlos Bentzen]

IIUC, BT2100-PQ has the same YUV->RGB matrix as BT2020, but it has a different EOTF which is non-linear. So to fully support tone-mapping it to sRGB, an extra step in the fragment shader would be needed.

[Carlos Bentzen]

Created attachment 477257 [details]
Life Untouched as displayed in Epiphany

[Carlos Bentzen]

Created attachment 477258 [details]
Life Untouched with correct Tone Mapping

[Carlos Bentzen]

FWIW here an HDR10 sample file for testing: https://4kmedia.org/life-untouched-hdr-uhd-4k-demo/

[Carlos Bentzen]

Got something working for the tone-mapping. I'll submit a patch soon.

[Carlos Bentzen]

Pull request: https://github.com/WebKit/WebKit/pull/53351

[Carlos Bentzen]

Created attachment 477266 [details]
Life Untouched with Tone Mapping in MiniBrowser

[EWS]

Committed 302751@main (1c03de58be74): <https://commits.webkit.org/302751@main>

Reviewed commits have been landed. Closing PR #53351 and removing active labels.

[Radar WebKit Bug Importer]

<rdar://problem/164281423>