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diff --git a/widget/windows/WinCompositorWidget.h b/widget/windows/WinCompositorWidget.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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_WinCompositorWidget_h
+#define widget_windows_WinCompositorWidget_h
+
+#include "CompositorWidget.h"
+#include "mozilla/Atomics.h"
+#include "mozilla/gfx/CriticalSection.h"
+#include "mozilla/gfx/Point.h"
+#include "mozilla/layers/LayersTypes.h"
+#include "mozilla/Mutex.h"
+#include "mozilla/widget/WinCompositorWindowThread.h"
+#include "FxROutputHandler.h"
+#include "nsIWidget.h"
+
+class nsWindow;
+
+namespace mozilla {
+namespace widget {
+
+class PlatformCompositorWidgetDelegate : public CompositorWidgetDelegate {
+ public:
+ // Callbacks for nsWindow.
+ virtual void EnterPresentLock() = 0;
+ virtual void LeavePresentLock() = 0;
+ virtual void OnDestroyWindow() = 0;
+ virtual bool OnWindowResize(const LayoutDeviceIntSize& aSize) = 0;
+ virtual void OnWindowModeChange(nsSizeMode aSizeMode) = 0;
+
+ // Transparency handling.
+ virtual void UpdateTransparency(TransparencyMode aMode) = 0;
+ virtual void ClearTransparentWindow() = 0;
+
+ // Deliver visibility info
+ virtual void NotifyVisibilityUpdated(nsSizeMode aSizeMode,
+ bool aIsFullyOccluded) = 0;
+
+ // CompositorWidgetDelegate Overrides
+
+ PlatformCompositorWidgetDelegate* AsPlatformSpecificDelegate() override {
+ return this;
+ }
+};
+
+class WinCompositorWidgetInitData;
+
+// This is the Windows-specific implementation of CompositorWidget. For
+// the most part it only requires an HWND, however it maintains extra state
+// for transparent windows, as well as for synchronizing WM_SETTEXT messages
+// with the compositor.
+class WinCompositorWidget : public CompositorWidget {
+ public:
+ WinCompositorWidget(const WinCompositorWidgetInitData& aInitData,
+ const layers::CompositorOptions& aOptions);
+ ~WinCompositorWidget() override;
+
+ // CompositorWidget Overrides
+
+ uintptr_t GetWidgetKey() override;
+ WinCompositorWidget* AsWindows() override { return this; }
+
+ HWND GetHwnd() const {
+ return mCompositorWnds.mCompositorWnd ? mCompositorWnds.mCompositorWnd
+ : mWnd;
+ }
+
+ HWND GetCompositorHwnd() const { return mCompositorWnds.mCompositorWnd; }
+
+ void EnsureCompositorWindow();
+ void DestroyCompositorWindow();
+ void UpdateCompositorWndSizeIfNecessary();
+
+ void RequestFxrOutput();
+ bool HasFxrOutputHandler() const { return mFxrHandler != nullptr; }
+ FxROutputHandler* GetFxrOutputHandler() const { return mFxrHandler.get(); }
+
+ virtual nsSizeMode GetWindowSizeMode() const = 0;
+ virtual bool GetWindowIsFullyOccluded() const = 0;
+
+ virtual void UpdateCompositorWnd(const HWND aCompositorWnd,
+ const HWND aParentWnd) = 0;
+ virtual void SetRootLayerTreeID(const layers::LayersId& aRootLayerTreeId) = 0;
+
+ protected:
+ bool mSetParentCompleted;
+
+ private:
+ uintptr_t mWidgetKey;
+ HWND mWnd;
+
+ WinCompositorWnds mCompositorWnds;
+ LayoutDeviceIntSize mLastCompositorWndSize;
+
+ UniquePtr<FxROutputHandler> mFxrHandler;
+};
+
+} // namespace widget
+} // namespace mozilla
+
+#endif // widget_windows_WinCompositorWidget_h