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38 lines
1.2 KiB
C++
38 lines
1.2 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef _MOZILLA_WIDGET_WINDOW_SURFACE_H
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#define _MOZILLA_WIDGET_WINDOW_SURFACE_H
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#include "mozilla/gfx/2D.h"
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#include "Units.h"
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namespace mozilla {
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namespace widget {
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// A class for drawing to double-buffered windows.
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class WindowSurface {
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public:
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virtual ~WindowSurface() {}
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// Locks a region of the window for drawing, returning a draw target
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// capturing the bounds of the provided region.
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// Implementations must permit invocation from any thread.
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virtual already_AddRefed<gfx::DrawTarget> Lock(const LayoutDeviceIntRegion& aRegion) = 0;
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// Swaps the provided invalid region from the back buffer to the window.
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// Implementations must permit invocation from any thread.
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virtual void Commit(const LayoutDeviceIntRegion& aInvalidRegion) = 0;
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// Whether the window surface represents a fallback method.
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virtual bool IsFallback() const { return false; }
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};
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} // namespace widget
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} // namespace mozilla
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#endif // _MOZILLA_WIDGET_WINDOW_SURFACE_H
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