third_party/WebKit/Source/core/layout/compositing/GraphicsLayerUpdater.h

/*
 * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
 * Copyright (C) 2014 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef GraphicsLayerUpdater_h
#define GraphicsLayerUpdater_h

#include "platform/graphics/GraphicsLayer.h"
#include "wtf/Allocator.h"

namespace blink {

class PaintLayer;

class GraphicsLayerUpdater {
    STACK_ALLOCATED();
public:
    GraphicsLayerUpdater();
    ~GraphicsLayerUpdater();

    enum UpdateType {
        DoNotForceUpdate,
        ForceUpdate,
    };

    void update(PaintLayer&, Vector<PaintLayer*>& layersNeedingPaintInvalidation);

    bool needsRebuildTree() const { return m_needsRebuildTree; }

#if ENABLE(ASSERT)
    static void assertNeedsToUpdateGraphicsLayerBitsCleared(PaintLayer&);
#endif

private:
    class UpdateContext;

    void updateRecursive(PaintLayer&, UpdateType, const UpdateContext&, Vector<PaintLayer*>& layersNeedingPaintInvalidation);

    bool m_needsRebuildTree;
};

} // namespace blink

#endif // GraphicsLayerUpdater_h