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// 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/CoreExport.h"
#include "core/layout/compositing/CompositingTriggers.h"
#include "platform/graphics/CompositingReasons.h"
#include "wtf/Allocator.h"
#include "wtf/Noncopyable.h"
namespace blink {
class PaintLayer;
class LayoutObject;
class ComputedStyle;
class LayoutView;
class CORE_EXPORT CompositingReasonFinder {
DISALLOW_NEW();
WTF_MAKE_NONCOPYABLE(CompositingReasonFinder);
public:
explicit CompositingReasonFinder(LayoutView&);
CompositingReasons potentialCompositingReasonsFromStyle(LayoutObject*) const;
CompositingReasons directReasons(const PaintLayer*) const;
void updateTriggers();
bool hasOverflowScrollTrigger() const;
bool requiresCompositingForScrollableFrame() const;
static bool requiresCompositingForAnimation(const ComputedStyle&);
static bool requiresCompositingForEffectAnimation(const ComputedStyle&);
static bool requiresCompositingForTransformAnimation(const ComputedStyle&);
static bool requiresCompositingForTransform(const LayoutObject&);
private:
bool isMainFrame() const;
CompositingReasons nonStyleDeterminedDirectReasons(const PaintLayer*) const;
bool requiresCompositingForScrollDependentPosition(const PaintLayer*) const;
LayoutView& m_layoutView;
CompositingTriggerFlags m_compositingTriggers;
};
} // namespace blink
#endif // CompositingReasonFinder_h
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