1 files changed, 103 insertions, 0 deletions
diff --git a/widget/gtk/GtkCompositorWidget.h b/widget/gtk/GtkCompositorWidget.h
new file mode 100644
index 0000000000..f0cb15fbfc
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+++ b/widget/gtk/GtkCompositorWidget.h
@@ -0,0 +1,103 @@
+/* -*- 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_gtk_GtkCompositorWidget_h
+#define widget_gtk_GtkCompositorWidget_h
+
+#include "GLDefs.h"
+#include "mozilla/DataMutex.h"
+#include "mozilla/widget/CompositorWidget.h"
+#include "WindowSurfaceProvider.h"
+
+class nsIWidget;
+class nsWindow;
+
+namespace mozilla {
+namespace widget {
+
+class PlatformCompositorWidgetDelegate : public CompositorWidgetDelegate {
+ public:
+  virtual void NotifyClientSizeChanged(
+      const LayoutDeviceIntSize& aClientSize) = 0;
+
+  // CompositorWidgetDelegate Overrides
+
+  PlatformCompositorWidgetDelegate* AsPlatformSpecificDelegate() override {
+    return this;
+  }
+};
+
+class GtkCompositorWidgetInitData;
+
+class GtkCompositorWidget : public CompositorWidget,
+                            public PlatformCompositorWidgetDelegate {
+ public:
+  GtkCompositorWidget(const GtkCompositorWidgetInitData& aInitData,
+                      const layers::CompositorOptions& aOptions,
+                      nsWindow* aWindow /* = nullptr*/);
+  ~GtkCompositorWidget();
+
+  // CompositorWidget Overrides
+
+  already_AddRefed<gfx::DrawTarget> StartRemoteDrawing() override;
+  void EndRemoteDrawing() override;
+
+  already_AddRefed<gfx::DrawTarget> StartRemoteDrawingInRegion(
+      LayoutDeviceIntRegion& aInvalidRegion,
+      layers::BufferMode* aBufferMode) override;
+  void EndRemoteDrawingInRegion(
+      gfx::DrawTarget* aDrawTarget,
+      const LayoutDeviceIntRegion& aInvalidRegion) override;
+  uintptr_t GetWidgetKey() override;
+
+  LayoutDeviceIntSize GetClientSize() override;
+
+  nsIWidget* RealWidget() override;
+  GtkCompositorWidget* AsX11() override { return this; }
+  CompositorWidgetDelegate* AsDelegate() override { return this; }
+
+  EGLNativeWindowType GetEGLNativeWindow();
+  int32_t GetDepth();
+
+  void ClearBeforePaint(RefPtr<gfx::DrawTarget> aTarget,
+                        const LayoutDeviceIntRegion& aRegion) override;
+
+#if defined(MOZ_X11)
+  Display* XDisplay() const { return mXDisplay; }
+  Window XWindow() const { return mXWindow; }
+#endif
+#if defined(MOZ_WAYLAND)
+  void SetEGLNativeWindowSize(const LayoutDeviceIntSize& aEGLWindowSize);
+#endif
+
+  // PlatformCompositorWidgetDelegate Overrides
+
+  void NotifyClientSizeChanged(const LayoutDeviceIntSize& aClientSize) override;
+
+ protected:
+  nsWindow* mWidget;
+
+ private:
+  // This field is written to on the main thread and read from on the compositor
+  // or renderer thread. During window resizing, this is subject to a (largely
+  // benign) read/write race, see bug 1665726. The DataMutex doesn't prevent the
+  // read/write race, but it does make it Not Undefined Behaviour, and also
+  // ensures we only ever use the old or new size, and not some weird synthesis
+  // of the two.
+  DataMutex<LayoutDeviceIntSize> mClientSize;
+
+  WindowSurfaceProvider mProvider;
+
+#if defined(MOZ_X11)
+  Display* mXDisplay = {};
+  Window mXWindow = {};
+#endif
+  int32_t mDepth = {};
+};
+
+}  // namespace widget
+}  // namespace mozilla
+
+#endif  // widget_gtk_GtkCompositorWidget_h