Respect system colour scheme for title bar colour (#109)

UnleashedRecomp/.gitignore

@@ -1,2 +1,2 @@
-version.h
+/version.h
-version.cpp
+/version.cpp

UnleashedRecomp/CMakeLists.txt

@@ -91,6 +91,7 @@ set(SWA_OS_CXX_SOURCES
     "os/logger.cpp"
     "os/media.cpp"
     "os/process.cpp"
+    "os/user.cpp"
     "os/version.cpp"
 )
 
@@ -99,6 +100,7 @@ if (WIN32)
         "os/win32/logger_win32.cpp"
         "os/win32/media_win32.cpp"
         "os/win32/process_win32.cpp"
+        "os/win32/user_win32.cpp"
         "os/win32/version_win32.cpp"
     )
 elseif (CMAKE_SYSTEM_NAME MATCHES "Linux")
@@ -106,6 +108,7 @@ elseif (CMAKE_SYSTEM_NAME MATCHES "Linux")
         "os/linux/logger_linux.cpp"
         "os/linux/media_linux.cpp"
         "os/linux/process_linux.cpp"
+        "os/linux/user_linux.cpp"
         "os/linux/version_linux.cpp"
     )
 endif()

UnleashedRecomp/os/linux/user_linux.cpp

@@ -0,0 +1,6 @@
+#include <os/user_detail.h>
+
+bool os::user::detail::IsDarkTheme()
+{
+    return false;
+}

UnleashedRecomp/os/user.cpp

@@ -0,0 +1,7 @@
+#include <os/user.h>
+#include <os/user_detail.h>
+
+bool os::user::IsDarkTheme()
+{
+    return detail::IsDarkTheme();
+}

UnleashedRecomp/os/user.h

@@ -0,0 +1,6 @@
+#pragma once
+
+namespace os::user
+{
+    bool IsDarkTheme();
+}

UnleashedRecomp/os/user_detail.h

@@ -0,0 +1,6 @@
+#pragma once
+
+namespace os::user::detail
+{
+    bool IsDarkTheme();
+}

UnleashedRecomp/os/win32/user_win32.cpp

@@ -0,0 +1,23 @@
+#include <os/user_detail.h>
+
+bool os::user::detail::IsDarkTheme()
+{
+    HKEY hKey;
+
+    if (RegOpenKeyExA(HKEY_CURRENT_USER, "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize", 0, KEY_READ, &hKey) == ERROR_SUCCESS)
+    {
+        DWORD value = 0;
+        DWORD valueSize = sizeof(value);
+
+        if (RegQueryValueExA(hKey, "AppsUseLightTheme", nullptr, nullptr, (LPBYTE)&value, &valueSize) == ERROR_SUCCESS)
+        {
+            RegCloseKey(hKey);
+
+            return value == 0;
+        }
+
+        RegCloseKey(hKey);
+    }
+
+    return false;
+}

UnleashedRecomp/ui/game_window.cpp

@@ -1,6 +1,7 @@
 #include "game_window.h"
 #include <gpu/video.h>
 #include <os/logger.h>
+#include <os/user.h>
 #include <os/version.h>
 #include <ui/sdl_listener.h>
 #include <app.h>
@@ -238,7 +239,7 @@ void GameWindow::Init(const char* sdlVideoDriver)
     static_assert(false, "Unknown platform.");
 #endif
 
-    SetDarkTitleBar(true);
+    SetTitleBarColour();
 
     SDL_ShowWindow(s_pWindow);
 }
@@ -307,20 +308,23 @@ void GameWindow::SetTitle(const char* title)
     SDL_SetWindowTitle(s_pWindow, title ? title : GetTitle());
 }
 
-void GameWindow::SetDarkTitleBar(bool isEnabled)
+void GameWindow::SetTitleBarColour()
 {
 #if _WIN32
-    auto version = os::version::GetOSVersion();
+    if (os::user::IsDarkTheme())
+    {
+        auto version = os::version::GetOSVersion();
 
-    if (version.Major < 10 || version.Build <= 17763)
+        if (version.Major < 10 || version.Build <= 17763)
-        return;
+            return;
 
-    auto flag = version.Build >= 18985
+        auto flag = version.Build >= 18985
-        ? DWMWA_USE_IMMERSIVE_DARK_MODE
+            ? DWMWA_USE_IMMERSIVE_DARK_MODE
-        : 19; // DWMWA_USE_IMMERSIVE_DARK_MODE_BEFORE_20H1
+            : 19; // DWMWA_USE_IMMERSIVE_DARK_MODE_BEFORE_20H1
 
-    const DWORD useImmersiveDarkMode = isEnabled;
+        const DWORD useImmersiveDarkMode = 1;
-    DwmSetWindowAttribute(s_renderWindow, flag, &useImmersiveDarkMode, sizeof(useImmersiveDarkMode));
+        DwmSetWindowAttribute(s_renderWindow, flag, &useImmersiveDarkMode, sizeof(useImmersiveDarkMode));
+    }
 #endif
 }
 

UnleashedRecomp/ui/game_window.h

@@ -30,7 +30,7 @@ public:
     static void SetIcon(bool isNight = false);
     static const char* GetTitle();
     static void SetTitle(const char* title = nullptr);
-    static void SetDarkTitleBar(bool isEnabled);
+    static void SetTitleBarColour();
     static bool IsFullscreen();
     static bool SetFullscreen(bool isEnabled);
     static void SetFullscreenCursorVisibility(bool isVisible);