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[client] wayland: forward HDR mastering metadata

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Propagate valid ST 2086 mastering primaries and luminance data, MaxCLL,
and MaxFALL to the Wayland compositor using the protocol's expected
units.
This commit is contained in:
Geoffrey McRae
2026-07-19 02:15:48 +10:00
parent 1f6dbb0dae
commit ad5d7753e8
5 changed files with 36 additions and 25 deletions
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48
client/displayservers/Wayland/gl.c
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@@ -82,7 +82,8 @@ static void applyHDRPending(void)
wlWm.pendingHDRMinDisplayLuminance,
wlWm.pendingHDRMaxCLL,
wlWm.pendingHDRMaxFALL,
wlWm.pendingHDRPQ);
wlWm.pendingHDRPQ,
wlWm.pendingHDRMetadata);
}
else if (wlWm.pendingHDRClear)
{
@@ -200,7 +201,7 @@ EGLNativeWindowType waylandGetEGLNativeWindow(void)
void waylandSetHDRImageDescription(const uint16_t displayPrimary[3][2],
const uint16_t whitePoint[2], uint32_t maxDisplayLuminance,
uint32_t minDisplayLuminance, uint32_t maxCLL, uint32_t maxFALL,
bool hdrPQ)
bool hdrPQ, bool hdrMetadata)
{
if (!wlWm.colorManager)
return;
@@ -294,26 +295,32 @@ void waylandSetHDRImageDescription(const uint16_t displayPrimary[3][2],
wlWm.hdrWhiteLevels.pq :
wlWm.hdrWhiteLevels.scRGB);
// Advertise the content primaries (BT.2020 for PQ). These describe the real
// colour gamut of the signal and are safe to forward.
if (wlWm.cmHasMasteringPrimaries)
// KVMFR uses the ST 2086/DXGI scale of 50,000 units per coordinate while
// color-management-v1 uses 1,000,000 units per coordinate.
if (hdrPQ && hdrMetadata && wlWm.cmHasMasteringPrimaries)
{
wp_image_description_creator_params_v1_set_mastering_display_primaries(
wlWm.hdrImageCreator,
displayPrimary[0][0], displayPrimary[0][1],
displayPrimary[1][0], displayPrimary[1][1],
displayPrimary[2][0], displayPrimary[2][1],
whitePoint[0], whitePoint[1]);
displayPrimary[0][0] * 20, displayPrimary[0][1] * 20,
displayPrimary[1][0] * 20, displayPrimary[1][1] * 20,
displayPrimary[2][0] * 20, displayPrimary[2][1] * 20,
whitePoint[0] * 20, whitePoint[1] * 20);
// NOTE: we deliberately do NOT forward the host's mastering luminance range,
// MaxCLL or MaxFALL. Those values describe the *virtual display* the IDD
// advertises to Windows (~1000 cd/m² from our EDID), not the content. LG
// captures the full-range scRGB desktop composition and passes it through to
// PQ without tone mapping, so the signal spans the entire PQ range (scRGB
// 125.0 == 10000 cd/m²). Advertising the virtual display's peak as the
// content peak makes the compositor place its tone-mapping knee there and
// hard-clip everything brighter, crushing highlights. Leaving these unset
// lets the content be treated as standard full-range PQ so the compositor
// tone-maps it to the actual physical display.
if ((uint64_t)maxDisplayLuminance * 10000 > minDisplayLuminance)
wp_image_description_creator_params_v1_set_mastering_luminance(
wlWm.hdrImageCreator,
minDisplayLuminance, maxDisplayLuminance);
}
if (hdrPQ && hdrMetadata)
{
if (maxCLL > 0)
wp_image_description_creator_params_v1_set_max_cll(
wlWm.hdrImageCreator, maxCLL);
if (maxFALL > 0 && (maxCLL == 0 || maxFALL <= maxCLL))
wp_image_description_creator_params_v1_set_max_fall(
wlWm.hdrImageCreator, maxFALL);
}
wlWm.hdrImageDesc =
wp_image_description_creator_params_v1_create(wlWm.hdrImageCreator);
@@ -349,7 +356,7 @@ void waylandSetHDRImageDescription(const uint16_t displayPrimary[3][2],
bool waylandRequestHDR(const uint16_t displayPrimary[3][2],
const uint16_t whitePoint[2], uint32_t maxDisplayLuminance,
uint32_t minDisplayLuminance, uint32_t maxCLL, uint32_t maxFALL,
bool hdrPQ)
bool hdrPQ, bool hdrMetadata)
{
if (!wlWm.cmFeaturesDone || !wlWm.cmHasParametric)
return false;
@@ -363,6 +370,7 @@ bool waylandRequestHDR(const uint16_t displayPrimary[3][2],
return false;
wlWm.pendingHDRPQ = hdrPQ;
wlWm.pendingHDRMetadata = hdrMetadata;
// Write all metadata before setting the apply flag to ensure the
// render thread sees the complete HDR metadata when it observes