Source/core/rendering/compositing/CompositingReasonFinder.h

// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CompositingReasonFinder_h
#define CompositingReasonFinder_h

#include "core/page/ChromeClient.h"
#include "core/rendering/RenderLayer.h"
#include "platform/graphics/CompositingReasons.h"

namespace WebCore {

class RenderLayer;
class RenderObject;
class RenderView;

class CompositingReasonFinder {
public:
    explicit CompositingReasonFinder(RenderView&);

    CompositingReasons directReasons(const RenderLayer*, bool* needToRecomputeCompositingRequirements) const;

    void updateTriggers();
    bool hasTriggers() const { return m_compositingTriggers; }

    bool has3DTransformTrigger() const;
    bool hasAnimationTrigger() const;

    bool requiresCompositingForScrollableFrame() const;
    bool requiresCompositingForPosition(RenderObject*, const RenderLayer*, RenderLayer::ViewportConstrainedNotCompositedReason*, bool* needToRecomputeCompositingRequirements) const;

    static bool isViewportConstrainedFixedOrStickyLayer(const RenderLayer*);

private:
    bool isMainFrame() const;

    bool requiresCompositingForAnimation(RenderObject*) const;
    bool requiresCompositingForTransition(RenderObject*) const;
    bool requiresCompositingForTransform(RenderObject*) const;
    bool requiresCompositingForVideo(RenderObject*) const;
    bool requiresCompositingForCanvas(RenderObject*) const;
    bool requiresCompositingForPlugin(RenderObject*, bool* needToRecomputeCompositingRequirements) const;
    bool requiresCompositingForFrame(RenderObject*, bool* needToRecomputeCompositingRequirements) const;
    bool requiresCompositingForBackfaceVisibilityHidden(RenderObject*) const;
    bool requiresCompositingForFilters(RenderObject*) const;
    bool requiresCompositingForOverflowScrollingParent(const RenderLayer*) const;
    bool requiresCompositingForOutOfFlowClipping(const RenderLayer*) const;
    bool requiresCompositingForOverflowScrolling(const RenderLayer*) const;
    bool requiresCompositingForWillChange(const RenderObject*) const;

    RenderView& m_renderView;
    ChromeClient::CompositingTriggerFlags m_compositingTriggers;
};

} // namespace WebCore

#endif // CompositingReasonFinder_h