widget/WindowSurface.h
author Aaron Klotz <aklotz@mozilla.com>
Thu, 27 Apr 2017 16:27:45 -0600
changeset 403610 ede9819237516b2e48b95b1d3e95f8eafe53b9fd
parent 369990 47e2650093d575c5042b43feb0575ef9678352b1
child 505383 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Bug 1360371: Backed out changesets c39e811e3a09 and d4e6fb6fb40a as they are no longer necessary; r=backout MozReview-Commit-ID: 7QSHmDn828Y

/* -*- 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