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[idd] edid: advertise the full PQ luminance range

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The virtual display transports HDR pixels rather than emitting light.
Advertise approximately 10,000 nits for both peak and frame-average
luminance, and leave the physical black level unspecified.

This prevents Windows from mapping HDR into an arbitrary virtual
display limit before the frame reaches the real host display.
This commit is contained in:
Geoffrey McRae
2026-07-19 20:42:20 +10:00
parent ad7d869aa1
commit 657ea3ebe6
1 changed files with 9 additions and 3 deletions
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12
idd/LGIdd/CEdid.cpp
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@@ -75,9 +75,15 @@ static const BYTE CTA_HDR_EOTF_TRADITIONAL_SDR = (BYTE)(1 << 0);
static const BYTE CTA_HDR_EOTF_SMPTE_ST_2084 = (BYTE)(1 << 2);
static const BYTE CTA_HDR_EOTF_HLG = (BYTE)(1 << 3);
static const BYTE CTA_HDR_STATIC_METADATA_TYPE_1 = (BYTE)(1 << 0);
static const BYTE CTA_HDR_DESIRED_MAX_LUMINANCE = 138;
static const BYTE CTA_HDR_DESIRED_MAX_FRAME_AVG_LUMINANCE = 115;
static const BYTE CTA_HDR_DESIRED_MIN_LUMINANCE = 14;
// The virtual display is a transport rather than a physical light-emitting
// device. Advertise the complete PQ range so Windows preserves HDR content
// for the real host display instead of mapping it to an arbitrary virtual
// peak or frame-average limit. The maximum values encode approximately
// 10,000 cd/m^2, while zero leaves the nonexistent physical black level
// unspecified.
static const BYTE CTA_HDR_DESIRED_MAX_LUMINANCE = 245;
static const BYTE CTA_HDR_DESIRED_MAX_FRAME_AVG_LUMINANCE = 245;
static const BYTE CTA_HDR_DESIRED_MIN_LUMINANCE = 0;
static const BYTE CTA_COLORIMETRY_OPYCC_601 = (BYTE)(1 << 3);
static const BYTE CTA_COLORIMETRY_OPRGB = (BYTE)(1 << 4);