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/*
* 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:
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(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; }
protected:
virtual ~WindowSurface() = default;
};
} // namespace widget
} // namespace mozilla
#endif // MOZILLA_WIDGET_WINDOW_SURFACE_H