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[idd] add support to return HDR metadata to clients

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Geoffrey McRae
2026-07-15 18:35:22 +10:00
parent 11b3ac00a8
commit 1b7a815cee
8 changed files with 233 additions and 16 deletions
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47
idd/LGIdd/CSwapChainProcessor.cpp
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@@ -366,8 +366,51 @@ bool CSwapChainProcessor::SwapChainNewFrame(ComPtr<IDXGIResource> acquiredBuffer
srcFormat.width = (unsigned)srcDesc.Width;
srcFormat.height = srcDesc.Height;
srcFormat.format = GetFrameType(srcDesc.Format);
srcFormat.hdr = srcDesc.Format == DXGI_FORMAT_R16G16B16A16_FLOAT;
srcFormat.hdrPQ = false;
// Determine HDR status from both format and color space.
// HDR metadata loading is handled inside each branch so the logic
// is self-contained: first identify the content type, then load the
// matching metadata.
if (srcDesc.Format == DXGI_FORMAT_R16G16B16A16_FLOAT)
{
// FP16 is HDR content (scRGB / linear, not PQ-curve).
// FP16 always carries HDR color data regardless of OS HDR mode,
// but metadata (primaries, luminances) may be unavailable.
srcFormat.hdr = true;
srcFormat.hdrPQ = false;
if (!m_devContext->GetHDRMetadata(srcFormat))
{
// No HDR metadata from the OS; provide reasonable defaults
// so downstream consumers have valid primaries and luminances.
// BT.709/sRGB primaries (in 0.00002 units):
srcFormat.displayPrimary[0][0] = 13250; // Rx
srcFormat.displayPrimary[0][1] = 34500; // Ry
srcFormat.displayPrimary[1][0] = 7500; // Gx
srcFormat.displayPrimary[1][1] = 30000; // Gy
srcFormat.displayPrimary[2][0] = 34000; // Bx
srcFormat.displayPrimary[2][1] = 16000; // By
// D65 white point (in 0.00002 units):
srcFormat.whitePoint[0] = 15635;
srcFormat.whitePoint[1] = 16450;
// 80 cd/m² display, 0.005 cd/m² black (in 0.0001 cd/m² units):
srcFormat.maxDisplayLuminance = 800000;
srcFormat.minDisplayLuminance = 50;
// Content light levels unknown:
srcFormat.maxContentLightLevel = 0;
srcFormat.maxFrameAverageLightLevel = 0;
}
}
else if (m_devContext->CanProcessFP16() && m_devContext->IsHDRActive())
{
// Non-FP16 format (e.g., RGBA10) with OS HDR mode active.
// Windows applies the PQ (ST.2084) transfer function for non-FP16 HDR.
srcFormat.hdr = true;
srcFormat.hdrPQ = true;
// Load HDR metadata; if none is available the frame is not HDR.
if (!m_devContext->GetHDRMetadata(srcFormat))
srcFormat.hdr = false;
}
bool postProcessFormatChanged = false;
if (!m_postProcessor.Configure(srcFormat, &postProcessFormatChanged))