/* -*- 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