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       1             : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
       2             :  *
       3             :  * This Source Code Form is subject to the terms of the Mozilla Public
       4             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       5             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       6             : 
       7             : #ifndef _MOZILLA_WIDGET_WINDOW_SURFACE_H
       8             : #define _MOZILLA_WIDGET_WINDOW_SURFACE_H
       9             : 
      10             : #include "mozilla/gfx/2D.h"
      11             : #include "Units.h"
      12             : 
      13             : namespace mozilla {
      14             : namespace widget {
      15             : 
      16             : // A class for drawing to double-buffered windows.
      17           1 : class WindowSurface {
      18             : public:
      19           0 :   virtual ~WindowSurface() {}
      20             : 
      21             :   // Locks a region of the window for drawing, returning a draw target
      22             :   // capturing the bounds of the provided region.
      23             :   // Implementations must permit invocation from any thread.
      24             :   virtual already_AddRefed<gfx::DrawTarget> Lock(const LayoutDeviceIntRegion& aRegion) = 0;
      25             : 
      26             :   // Swaps the provided invalid region from the back buffer to the window.
      27             :   // Implementations must permit invocation from any thread.
      28             :   virtual void Commit(const LayoutDeviceIntRegion& aInvalidRegion) = 0;
      29             : 
      30             :   // Whether the window surface represents a fallback method.
      31           0 :   virtual bool IsFallback() const { return false; }
      32             : };
      33             : 
      34             : }  // namespace widget
      35             : }  // namespace mozilla
      36             : 
      37             : #endif // _MOZILLA_WIDGET_WINDOW_SURFACE_H