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[idd] hdr: complete HDR display and cursor metadata

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Publish BT.2020 chromaticities in the virtual monitor EDID so
Windows receives a valid HDR colour volume.

Extend cursor messages with their IddCx SDR white level and an
explicit visibility-valid flag. Consumers can then calibrate cursors
without treating colour-transform-only messages as cursor hides.
This commit is contained in:
Geoffrey McRae
2026-07-19 04:42:03 +10:00
parent e9d0c88764
commit 20225f05d1
7 changed files with 62 additions and 10 deletions
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38
idd/LGIdd/CEdid.cpp
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@@ -309,6 +309,41 @@ static EdidStandardTiming MakeUnusedStandardTiming()
return timing;
}
#include <algorithm> // Ensure this header is included for std::min and std::max
static WORD EdidChromaticity(double value)
{
return (WORD)min(1023.0, max(0.0, value * 1024.0 + 0.5));
}
static void SetChromaticityCoordinates(BYTE coordinates[10])
{
// The virtual display transports HDR in the BT.2020 container. Describe
// that full container gamut and its D65 white point rather than leaving an
// invalid all-zero base-block colour volume.
const WORD rx = EdidChromaticity(0.7080);
const WORD ry = EdidChromaticity(0.2920);
const WORD gx = EdidChromaticity(0.1700);
const WORD gy = EdidChromaticity(0.7970);
const WORD bx = EdidChromaticity(0.1310);
const WORD by = EdidChromaticity(0.0460);
const WORD wx = EdidChromaticity(0.3127);
const WORD wy = EdidChromaticity(0.3290);
coordinates[0] = (BYTE)(((rx & 3) << 6) | ((ry & 3) << 4) |
((gx & 3) << 2) | (gy & 3));
coordinates[1] = (BYTE)(((bx & 3) << 6) | ((by & 3) << 4) |
((wx & 3) << 2) | (wy & 3));
coordinates[2] = (BYTE)(rx >> 2);
coordinates[3] = (BYTE)(ry >> 2);
coordinates[4] = (BYTE)(gx >> 2);
coordinates[5] = (BYTE)(gy >> 2);
coordinates[6] = (BYTE)(bx >> 2);
coordinates[7] = (BYTE)(by >> 2);
coordinates[8] = (BYTE)(wx >> 2);
coordinates[9] = (BYTE)(wy >> 2);
}
static void InitEdidBaseBlock(EdidBaseBlock& base)
{
memcpy(base.header, EDID_HEADER, sizeof(base.header));
@@ -328,6 +363,7 @@ static void InitEdidBaseBlock(EdidBaseBlock& base)
base.verticalSizeCm = EDID_VERTICAL_SIZE_CM;
base.displayGamma = EDID_DISPLAY_GAMMA_2_2;
base.supportedFeatures = EDID_FEATURES_PREFERRED_TIMING_RGB;
SetChromaticityCoordinates(base.chromaticityCoordinates);
for (UINT i = 0; i < EDID_STANDARD_TIMING_COUNT; ++i)
base.standardTimings[i] = MakeUnusedStandardTiming();
@@ -612,4 +648,4 @@ void CEdid::Build(const CSettings::DisplayModes& modes)
SetChecksum(cta);
memcpy(m_data.data() + sizeof(baseBlock), &ctaBlock, sizeof(ctaBlock));
}
}