Workaround HDR being captured as SDR issue

src/platform/windows/virtual_display.cpp

@@ -8,6 +8,8 @@
 
 #include <wrl/client.h>
 #include <dxgi.h>
+#include <highlevelmonitorconfigurationapi.h>
+#include <physicalmonitorenumerationapi.h>
 
 #include "virtual_display.h"
 
@@ -106,6 +108,83 @@ bool setPrimaryDisplay(const wchar_t* primaryDeviceName) {
 	return true;
 }
 
+
+bool ensureDisplayHDR(const wchar_t* displayName) {
+	UINT32 pathCount = 0, modeCount = 0;
+
+	if (GetDisplayConfigBufferSizes(QDC_ONLY_ACTIVE_PATHS, &pathCount, &modeCount) != ERROR_SUCCESS) {
+		printf("Failed to query display configuration.\n");
+		return false;
+	}
+
+	std::vector<DISPLAYCONFIG_PATH_INFO> pathArray(pathCount);
+	std::vector<DISPLAYCONFIG_MODE_INFO> modeArray(modeCount);
+
+	if (QueryDisplayConfig(QDC_ONLY_ACTIVE_PATHS, &pathCount, pathArray.data(), &modeCount, modeArray.data(), NULL) != ERROR_SUCCESS) {
+		printf("Failed to query display paths.\n");
+		return false;
+	}
+
+	for (const auto& path : pathArray) {
+		DISPLAYCONFIG_PATH_SOURCE_INFO sourceInfo = path.sourceInfo;
+
+		DISPLAYCONFIG_SOURCE_DEVICE_NAME deviceName = {};
+		deviceName.header.type = DISPLAYCONFIG_DEVICE_INFO_GET_SOURCE_NAME;
+		deviceName.header.size = sizeof(deviceName);
+		deviceName.header.adapterId = sourceInfo.adapterId;
+		deviceName.header.id = sourceInfo.id;
+
+		if (DisplayConfigGetDeviceInfo(&deviceName.header) != ERROR_SUCCESS) {
+			continue;
+		}
+
+		if (std::wstring_view(displayName) == deviceName.viewGdiDeviceName) {
+			DISPLAYCONFIG_GET_ADVANCED_COLOR_INFO hdrInfo = {};
+			hdrInfo.header.type = DISPLAYCONFIG_DEVICE_INFO_GET_ADVANCED_COLOR_INFO;
+			hdrInfo.header.size = sizeof(hdrInfo);
+			hdrInfo.header.adapterId = path.targetInfo.adapterId;
+			hdrInfo.header.id = path.targetInfo.id;
+
+			if (DisplayConfigGetDeviceInfo(&hdrInfo.header) != ERROR_SUCCESS) {
+				wprintf(L"Failed to get HDR info for display: %ls\n", std::wstring(deviceName.viewGdiDeviceName));
+				return false;
+			}
+
+			if (hdrInfo.advancedColorSupported) {
+				if (hdrInfo.advancedColorEnabled) {
+					DISPLAYCONFIG_SET_ADVANCED_COLOR_STATE setHdrInfo = {};
+					setHdrInfo.header.type = DISPLAYCONFIG_DEVICE_INFO_SET_ADVANCED_COLOR_STATE;
+					setHdrInfo.header.size = sizeof(setHdrInfo);
+					setHdrInfo.header.adapterId = path.targetInfo.adapterId;
+					setHdrInfo.header.id = path.targetInfo.id;
+					setHdrInfo.enableAdvancedColor = FALSE;  // Disable HDR
+
+					if (DisplayConfigSetDeviceInfo(&setHdrInfo.header) == ERROR_SUCCESS) {
+						wprintf(L"HDR toggled off for display: %ls\n", displayName);
+					} else {
+						wprintf(L"Failed to toggle HDR off for display: %ls\n", std::wstring(deviceName.viewGdiDeviceName));
+					}
+
+					setHdrInfo.enableAdvancedColor = TRUE;  // Enable HDR back on
+
+					if (DisplayConfigSetDeviceInfo(&setHdrInfo.header) == ERROR_SUCCESS) {
+						wprintf(L"HDR toggled on for display: %ls\n", displayName);
+						return true;
+					} else {
+						wprintf(L"Failed to toggle HDR on for display: %ls\n", std::wstring(deviceName.viewGdiDeviceName));
+					}
+				} else {
+					wprintf(L"HDR is not enabled on display: %ls\n", displayName);
+				}
+			}
+			return false;
+		}
+	}
+
+	wprintf(L"Display not found or HDR not supported: %ls\n", displayName);
+	return false;
+}
+
 void closeVDisplayDevice() {
 	if (SUDOVDA_DRIVER_HANDLE == INVALID_HANDLE_VALUE) {
 		return;

src/platform/windows/virtual_display.h

@@ -25,6 +25,7 @@ namespace VDISPLAY {
 	LONG changeDisplaySettings(const wchar_t* deviceName, int width, int height, int refresh_rate);
 	std::wstring getPrimaryDisplay();
 	bool setPrimaryDisplay(const wchar_t* primaryDeviceName);
+	bool ensureDisplayHDR(const wchar_t* displayName);
 
 	void closeVDisplayDevice();
 	DRIVER_STATUS openVDisplayDevice();

src/process.cpp

@@ -368,6 +368,24 @@ namespace proc {
 
     _app_launch_time = std::chrono::steady_clock::now();
 
+  #ifdef _WIN32
+    auto resetHDRThread = std::thread([this]{
+      std::this_thread::sleep_for(200ms);
+      // Windows doesn't seem to be able to set HDR correctly when a display is just connected,
+      // so we have tooggle HDR for the virtual display manually.
+      std::string currentDisplay = this->display_name;
+      if (!currentDisplay.empty()) {
+        if (VDISPLAY::ensureDisplayHDR(platf::from_utf8(currentDisplay).c_str())) {
+          BOOST_LOG(info) << "HDR rsestted for display " << currentDisplay;
+        } else {
+          BOOST_LOG(info) << "HDR not applied for display " << currentDisplay;
+        };
+      }
+    });
+
+    resetHDRThread.detach();
+  #endif
+
     fg.disable();
 
     return 0;

src/video_colorspace.cpp

@@ -24,6 +24,8 @@ namespace video {
 
     /* See video::config_t declaration for details */
 
+    BOOST_LOG(info) << "Client dynamicRange: " << config.dynamicRange << ", Display is HDR: " << hdr_display;
+
     if (config.dynamicRange > 0 && hdr_display) {
       // Rec. 2020 with ST 2084 perceptual quantizer
       colorspace.colorspace = colorspace_e::bt2020;