feat: Implement native desktop window chrome support for Windows

composeApp/build.gradle.kts

@@ -428,6 +428,7 @@ val windowsPlayerBridgeCommand = if (missingWindowsPlayerBridgeInputs.isNotEmpty
         "Ole32.lib",
         "User32.lib",
         "Gdi32.lib",
+        "Dwmapi.lib",
     ).joinToString(" ")
     val powershellCompileCommand = compileCommand.replace("\"", "__DQ__")
     val powershellCommand = """

composeApp/src/desktopMain/kotlin/com/nuvio/app/Main.kt

@@ -1,6 +1,7 @@
 package com.nuvio.app
 
 import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.SideEffect
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.res.painterResource
@@ -9,6 +10,7 @@ import androidx.compose.ui.window.WindowState
 import androidx.compose.ui.window.application
 import androidx.compose.ui.unit.dp
 import com.nuvio.app.features.player.PlatformPlayerSurface
+import com.nuvio.app.features.player.desktop.applyNativeDesktopWindowChrome
 import com.nuvio.app.features.player.desktop.preloadNativePlayerBridgeAsync
 import java.awt.Color as AwtColor
 import javax.swing.JComponent
@@ -40,6 +42,9 @@ fun main() {
                 window.contentPane.background = NuvioDesktopNativeBackground
                 (window.contentPane as? JComponent)?.isOpaque = true
             }
+            LaunchedEffect(window) {
+                applyNativeDesktopWindowChrome(window)
+            }
 
             if (smokePlayerUrl == null) {
                 App()

composeApp/src/desktopMain/kotlin/com/nuvio/app/features/player/desktop/DesktopWindowChrome.kt

@@ -0,0 +1,21 @@
+package com.nuvio.app.features.player.desktop
+
+import java.awt.Window
+
+private const val NuvioWindowBackgroundRgb = 0x0D0D0D
+private const val NuvioWindowTextRgb = 0xF5F7F8
+
+internal fun applyNativeDesktopWindowChrome(window: Window) {
+    if (DesktopHostOs.current != DesktopHostOs.WINDOWS || !window.isDisplayable) return
+
+    runCatching {
+        val hwnd = AwtNativeViewResolver.resolveNativeViewPointer(window)
+        NativePlayerBridge.applyWindowChrome(
+            windowHwnd = hwnd,
+            darkMode = true,
+            captionColorRgb = NuvioWindowBackgroundRgb,
+            borderColorRgb = NuvioWindowBackgroundRgb,
+            textColorRgb = NuvioWindowTextRgb,
+        )
+    }
+}

composeApp/src/desktopMain/kotlin/com/nuvio/app/features/player/desktop/NativePlayerBridge.kt

@@ -47,6 +47,14 @@ internal object NativePlayerBridge {
     external fun addSubtitleUrl(handle: Long, url: String)
     external fun clearExternalSubtitles(handle: Long)
     external fun clearExternalSubtitlesAndSelect(handle: Long, trackId: Int)
+    external fun applyWindowChrome(
+        windowHwnd: Long,
+        darkMode: Boolean,
+        captionColorRgb: Int,
+        borderColorRgb: Int,
+        textColorRgb: Int,
+    )
+
     external fun setSubtitleDelayMs(handle: Long, delayMs: Int)
     external fun applySubtitleStyle(
         handle: Long,

composeApp/src/desktopMain/native/windows/player_bridge.cpp

@@ -2,6 +2,7 @@
 #define WIN32_LEAN_AND_MEAN
 #endif
 #include <windows.h>
+#include <dwmapi.h>
 #include <wrl.h>
 #include <WebView2.h>
 #include <jni.h>
@@ -59,6 +60,11 @@ constexpr UINT WM_NUVIO_TASK = WM_APP + 0x4E50;
 constexpr UINT_PTR NUVIO_TIMER_ID = 0x4E50;
 const wchar_t *kMessageWindowClass = L"NuvioPlayerBridgeMessageWindow";
 const wchar_t *kContainerWindowClass = L"NuvioPlayerBridgeContainerWindow";
+constexpr DWORD kDwmwaUseImmersiveDarkMode = 20;
+constexpr DWORD kDwmwaUseImmersiveDarkModeLegacy = 19;
+constexpr DWORD kDwmwaBorderColor = 34;
+constexpr DWORD kDwmwaCaptionColor = 35;
+constexpr DWORD kDwmwaTextColor = 36;
 
 std::wstring toWide(const std::string &value) {
     if (value.empty()) return std::wstring();
@@ -131,6 +137,36 @@ std::string lowerCopy(std::string value) {
     return value;
 }
 
+COLORREF rgbIntToColorRef(jint rgb) {
+    BYTE red = (BYTE)((rgb >> 16) & 0xFF);
+    BYTE green = (BYTE)((rgb >> 8) & 0xFF);
+    BYTE blue = (BYTE)(rgb & 0xFF);
+    return RGB(red, green, blue);
+}
+
+void setDwmWindowAttribute(HWND hwnd, DWORD attribute, const void *value, DWORD valueSize) {
+    (void)DwmSetWindowAttribute(hwnd, attribute, value, valueSize);
+}
+
+void applyDwmWindowChrome(HWND hwnd, bool darkMode, COLORREF captionColor, COLORREF borderColor, COLORREF textColor) {
+    if (!hwnd || !IsWindow(hwnd)) return;
+
+    BOOL enabled = darkMode ? TRUE : FALSE;
+    HRESULT darkModeResult = DwmSetWindowAttribute(
+        hwnd,
+        kDwmwaUseImmersiveDarkMode,
+        &enabled,
+        sizeof(enabled)
+    );
+    if (FAILED(darkModeResult)) {
+        setDwmWindowAttribute(hwnd, kDwmwaUseImmersiveDarkModeLegacy, &enabled, sizeof(enabled));
+    }
+
+    setDwmWindowAttribute(hwnd, kDwmwaCaptionColor, &captionColor, sizeof(captionColor));
+    setDwmWindowAttribute(hwnd, kDwmwaBorderColor, &borderColor, sizeof(borderColor));
+    setDwmWindowAttribute(hwnd, kDwmwaTextColor, &textColor, sizeof(textColor));
+}
+
 bool containsCaseInsensitive(const std::string &haystack, const std::string &needle) {
     return lowerCopy(haystack).find(lowerCopy(needle)) != std::string::npos;
 }
@@ -1654,6 +1690,25 @@ Java_com_nuvio_app_features_player_desktop_NativePlayerBridge_clearExternalSubti
     if (player) player->removeExternalSubtitlesAndSelect(trackId);
 }
 
+extern "C" JNIEXPORT void JNICALL
+Java_com_nuvio_app_features_player_desktop_NativePlayerBridge_applyWindowChrome(
+    JNIEnv *,
+    jobject,
+    jlong windowHwnd,
+    jboolean darkMode,
+    jint captionColorRgb,
+    jint borderColorRgb,
+    jint textColorRgb
+) {
+    applyDwmWindowChrome(
+        (HWND)(intptr_t)windowHwnd,
+        darkMode == JNI_TRUE,
+        rgbIntToColorRef(captionColorRgb),
+        rgbIntToColorRef(borderColorRgb),
+        rgbIntToColorRef(textColorRgb)
+    );
+}
+
 extern "C" JNIEXPORT void JNICALL
 Java_com_nuvio_app_features_player_desktop_NativePlayerBridge_setSubtitleDelayMs(JNIEnv *, jobject, jlong handle, jint delayMs) {
     auto player = playerFromHandle(handle);