1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- 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 class WindowSurface { 18 public: 19 NS_INLINE_DECL_THREADSAFE_REFCOUNTING(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( 25 const LayoutDeviceIntRegion& aRegion) = 0; 26 27 // Swaps the provided invalid region from the back buffer to the window. 28 // Implementations must permit invocation from any thread. 29 virtual void Commit(const LayoutDeviceIntRegion& aInvalidRegion) = 0; 30 31 // Whether the window surface represents a fallback method. IsFallback()32 virtual bool IsFallback() const { return false; } 33 34 protected: 35 virtual ~WindowSurface() = default; 36 }; 37 38 } // namespace widget 39 } // namespace mozilla 40 41 #endif // _MOZILLA_WIDGET_WINDOW_SURFACE_H 42