commit 4130a38e27c173f4789fd8b87e73ae082e1599e2
author Anantanarayanan G Iyengar <aiyengar@nvidia.com> Fri Nov 01 21:46:33 2024
committer Chromium LUCI CQ <chromium-scoped@luci-project-accounts.iam.gserviceaccount.com> Fri Nov 01 21:46:33 2024
tree b7c0762e7bfa43f5048eab161f978219aef383bb
parent e8dc31a292ed93e28e1532652547ceeaa007576f

Support HDR Swap Chains without HDR Metadata in Chromium on Windows

Currently in Chromium on Windows swap chains with the
DXGI_FORMAT_R10G10B10A2_UNORM for HDR 10 content are only created
when there is accompanying HDR metadata. For WebRTC video streams,
HDR metadata is an optional extension. In addition the gfx
HDRMetadata structure
https://source.chromium.org/chromium/chromium/src/+/main:ui/gfx/hdr_metadata.h;l=132?q=gfx::HDRMetadata&ss=chromium
already has reasonable defaults (the gamut is set to rec2020,
minimum luminance to 0 nits, and maximum luminance to 10,000 nits)

Without metadata the DXGI swap chain defaults to
DXGI_FORMAT_B8G8R8A8_UNORM which is basically downgrading the
stream to SDR.

This patch provides functionality to allow hdr10 swap chains to
be created on Windows if there is no accompanying metadata if
the input color space is BT.2020 with the transfer function PQ.

We also ensure that the DC overlay processor allows the video
overlay to be created if the video format is BT.2020 with transfer
function PQ (HDR 10).

BUG=376304009

Change-Id: I15edb5ecb0d99359c9038c9505579ab6905753a2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5976756
Reviewed-by: Sida Zhu <zhusida@bytedance.com>
Reviewed-by: Markus Handell <handellm@google.com>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Maggie Chen <magchen@chromium.org>
Commit-Queue: Anantanarayanan Iyengar US <aiyengar@nvidia.com>
Cr-Commit-Position: refs/heads/main@{#1377106}