1 files changed, 67 insertions, 0 deletions
diff --git a/widget/windows/WinCompositorWindowThread.h b/widget/windows/WinCompositorWindowThread.h
new file mode 100644
index 0000000000..372e3d91c2
--- /dev/null
+++ b/widget/windows/WinCompositorWindowThread.h
@@ -0,0 +1,67 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef widget_windows_WinCompositorWindowThread_h
+#define widget_windows_WinCompositorWindowThread_h
+
+#include "base/thread.h"
+#include "base/message_loop.h"
+#include "mozilla/Monitor.h"
+
+namespace mozilla {
+namespace widget {
+
+struct WinCompositorWnds {
+  HWND mCompositorWnd;
+  HWND mInitialParentWnd;
+  WinCompositorWnds(HWND aCompositorWnd, HWND aInitialParentWnd)
+      : mCompositorWnd(aCompositorWnd), mInitialParentWnd(aInitialParentWnd) {}
+};
+
+class WinCompositorWindowThread final {
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING_WITH_DELETE_ON_MAIN_THREAD(
+      WinCompositorWindowThread)
+
+ public:
+  /// Can be called from any thread.
+  static WinCompositorWindowThread* Get();
+
+  /// Can only be called from the main thread.
+  static void Start();
+
+  /// Can only be called from the main thread.
+  static void ShutDown();
+
+  /// Can be called from any thread.
+  static MessageLoop* Loop();
+
+  /// Can be called from any thread.
+  static bool IsInCompositorWindowThread();
+
+  /// Can be called from any thread.
+  static WinCompositorWnds CreateCompositorWindow();
+
+  /// Can be called from any thread.
+  static void DestroyCompositorWindow(WinCompositorWnds aWnds);
+
+ private:
+  explicit WinCompositorWindowThread(base::Thread* aThread);
+  ~WinCompositorWindowThread() {}
+
+  void ShutDownTask();
+
+  UniquePtr<base::Thread> const mThread;
+  Monitor mMonitor;
+
+  // Has ShutDown been called on us? We might have survived if our thread join
+  // timed out.
+  bool mHasAttemptedShutdown = false;
+};
+
+}  // namespace widget
+}  // namespace mozilla
+
+#endif  // widget_windows_WinCompositorWindowThread_h