widget/WindowSurface.h
author Lee Salzman <lsalzman@mozilla.com>
Thu, 01 Dec 2016 12:14:50 -0500
changeset 325031 87e3edcefc5bc35b707dc9df00190fbf203b5c8d
parent 325030 d727d297aeeee2e9e490b4285d365d35f9323c8e
child 325032 47e2650093d575c5042b43feb0575ef9678352b1
permissions -rw-r--r--
Backed out changeset d727d297aeee for wrong bug number (bug 1319544)

/* -*- 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;
};

}  // namespace widget
}  // namespace mozilla

#endif // _MOZILLA_WIDGET_WINDOW_SURFACE_H