[client/idd] hdr: fix incorrect tone mapping knee bug

2026-07-16 04:12:03 +00:00 · 2026-07-16 10:48:10 +10:00
parent e502af7d9d
commit 0140a3f6fb
3 changed files with 32 additions and 19 deletions
--- a/idd/LGIdd/CSwapChainProcessor.cpp
+++ b/idd/LGIdd/CSwapChainProcessor.cpp
@@ -396,8 +396,9 @@ bool CSwapChainProcessor::SwapChainNewFrame(ComPtr<IDXGIResource> acquiredBuffer
      // 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;
+      // Mastering luminances follow SMPTE ST 2086 units: max in whole cd/m²,
+      // min in 0.0001 cd/m². 80 cd/m² display, 0.005 cd/m² black:
+      srcFormat.maxDisplayLuminance = 80;
      srcFormat.minDisplayLuminance = 50;
      // Content light levels unknown:
      srcFormat.maxContentLightLevel      = 0;