[idd/client] apply the Windows display color transform

Honor the IddCx 3x4 XYZ matrix and post-transfer LUT in the IDD
conversion pipeline. Carry transform changes to the client so EGL applies
the same calibration to hardware cursors, and invalidate the full frame
whenever calibration changes.

idd/LGIdd/CIndirectDeviceContext.h

@@ -45,6 +45,7 @@ extern "C" {
 #endif
 
 #define MAX_POINTER_SIZE (sizeof(KVMFRCursor) + (512 * 512 * 4))
+#define COLOR_TRANSFORM_BUFFERS 3
 #define POINTER_SHAPE_BUFFERS 3
 
 //FIXME: this should not really be done here, this is a hack
@@ -90,9 +91,11 @@ private:
   PLGMPHostQueue m_pointerQueue = nullptr;
   PLGMPMemory    m_pointerMemory     [LGMP_Q_POINTER_LEN   ] = {};
   PLGMPMemory    m_pointerShapeMemory[POINTER_SHAPE_BUFFERS] = {};
+  PLGMPMemory    m_pointerTransformMemory[COLOR_TRANSFORM_BUFFERS] = {};
   PLGMPMemory    m_pointerShape = nullptr;
   int m_pointerMemoryIndex = 0;
   int m_pointerShapeIndex  = 0;
+  int m_pointerTransformIndex = 0;
   bool m_cursorVisible = false;
   int m_cursorX = 0, m_cursorY = 0;
 
@@ -137,6 +140,12 @@ private:
   bool     m_lastHDRActive                    = false;
   bool     m_lastHDRMetadata                  = false;
 
+  // Windows display calibration transform. The callback publishes immutable
+  // snapshots so the swap-chain thread never observes a partially updated
+  // matrix or LUT.
+  mutable SRWLOCK m_colorTransformLock = SRWLOCK_INIT;
+  std::shared_ptr<const D12ColorTransform> m_colorTransform;
+
   void QueryIddCxCapabilities();
   bool CanUseIddCx110DDIs() const { return m_canProcessFP16; }
 
@@ -145,7 +154,8 @@ private:
 
   void DeInitLGMP();
   void LGMPTimer();
-  void ResendCursor() const;
+  void ResendCursor();
+  void SendColorTransform();
   void InitializeEdid();
 
   // Guards m_displayModes and m_edid. The mode list is rebuilt on the LGMP
@@ -220,6 +230,9 @@ public:
   // Tracks HDR state from EvtIddCxMonitorSetDefaultHdrMetadata
   void SetHDRActive(const struct IDDCX_HDR10_METADATA * hdrMeta);
 
+  void SetColorTransform(std::shared_ptr<const D12ColorTransform> transform);
+  std::shared_ptr<const D12ColorTransform> GetColorTransform() const;
+
   // Returns true if the display is currently in HDR mode
   bool IsHDRActive() const
   {