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-rw-r--r--widget/WindowSurface.h37
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diff --git a/widget/WindowSurface.h b/widget/WindowSurface.h
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ *
+ * 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 _MOZILLA_WIDGET_WINDOW_SURFACE_H
+#define _MOZILLA_WIDGET_WINDOW_SURFACE_H
+
+#include "mozilla/gfx/2D.h"
+#include "Units.h"
+
+namespace mozilla {
+namespace widget {
+
+// A class for drawing to double-buffered windows.
+class WindowSurface {
+public:
+ virtual ~WindowSurface() {}
+
+ // Locks a region of the window for drawing, returning a draw target
+ // capturing the bounds of the provided region.
+ // Implementations must permit invocation from any thread.
+ virtual already_AddRefed<gfx::DrawTarget> Lock(const LayoutDeviceIntRegion& aRegion) = 0;
+
+ // Swaps the provided invalid region from the back buffer to the window.
+ // Implementations must permit invocation from any thread.
+ virtual void Commit(const LayoutDeviceIntRegion& aInvalidRegion) = 0;
+
+ // Whether the window surface represents a fallback method.
+ virtual bool IsFallback() const { return false; }
+};
+
+} // namespace widget
+} // namespace mozilla
+
+#endif // _MOZILLA_WIDGET_WINDOW_SURFACE_H