[graphics/krita] libs/ui/opengl: Use a 80nits PQ profile for the surface on Windows

Git commit 143084b93fa1188436c7009faaec74b559258d10 by Wolthera van Hövell, on behalf of Dmitry Kazakov.
Committed on 16/07/2026 at 16:26.
Pushed by woltherav into branch 'master'.

Use a 80nits PQ profile for the surface on Windows

On Windows, the window surface profile is currently
hardcoded to 80 nits inside Qt's code, so we need to
select the profile accordingly.

M  +12   -3    libs/ui/opengl/KisOpenGLModeProber.cpp

https://invent.kde.org/graphics/krita/-/commit/143084b93fa1188436c7009faaec74b559258d10

diff --git a/libs/ui/opengl/KisOpenGLModeProber.cpp b/libs/ui/opengl/KisOpenGLModeProber.cpp
index f1a46ebb984..bfcbead58d2 100644
--- a/libs/ui/opengl/KisOpenGLModeProber.cpp
+++ b/libs/ui/opengl/KisOpenGLModeProber.cpp
@@ -14,6 +14,11 @@
 #include <QWindow>
 #include <QColorSpace>
 
+#ifdef HAVE_HDR
+// for fetching the legacy 80-nits PQ space
+#include <KoColorProfileQuery.h>
+#endif
+
 #ifdef HAVE_X11
 #include <qpa/qplatformnativeinterface.h>
 #endif
@@ -55,16 +60,20 @@ const KoColorProfile *KisOpenGLModeProber::rootSurfaceColorProfile() const
 {
     const KoColorProfile *profile = KoColorSpaceRegistry::instance()->p709SRGBProfile();
 
-    const auto surfaceColorSpace = 
+    const auto surfaceColorSpace =
         KisSurfaceColorSpaceWrapper::fromQtColorSpace(surfaceformatInUse().colorSpace());
-    
+
     if (surfaceColorSpace == KisSurfaceColorSpaceWrapper::sRGBColorSpace) {
         // use the default one!
 #ifdef HAVE_HDR
     } else if (surfaceColorSpace == KisSurfaceColorSpaceWrapper::scRGBColorSpace) {
         profile = KoColorSpaceRegistry::instance()->p709G10Profile();
     } else if (surfaceColorSpace == KisSurfaceColorSpaceWrapper::bt2020PQColorSpace) {
-        profile = KoColorSpaceRegistry::instance()->p2020PQProfile();
+        // On Windows we use the legacy PQ profile, explicitly pinned to
+        // 80 nits. It is baked in the Qt's source code
+        KoColorProfileQuery query(PRIMARIES_ITU_R_BT_2020_2_AND_2100_0, TRC_ITU_R_BT_2100_0_PQ);
+        query.hdrReferenceWhite = 80.0;
+        profile = KoColorSpaceRegistry::instance()->profileFor(query);
 #endif
     }