#pragma once
#include "CSSPropertyNames.h"
#include <wtf/RefCounted.h>
#include <wtf/Vector.h>
namespace WebCore {
class WillChangeData : public RefCounted<WillChangeData> {
WTF_MAKE_FAST_ALLOCATED;
public:
static Ref<WillChangeData> create()
{
return adoptRef(*new WillChangeData);
}
bool operator==(const WillChangeData&) const;
bool operator!=(const WillChangeData& o) const
{
return !(*this == o);
}
bool isAuto() const { return m_animatableFeatures.isEmpty(); }
size_t numFeatures() const { return m_animatableFeatures.size(); }
bool containsScrollPosition() const;
bool containsContents() const;
bool containsProperty(CSSPropertyID) const;
bool canCreateStackingContext() const { return m_canCreateStackingContext; }
bool canTriggerCompositing() const { return m_canTriggerCompositing; }
bool canTriggerCompositingOnInline() const { return m_canTriggerCompositingOnInline; }
enum Feature {
ScrollPosition,
Contents,
Property,
Invalid
};
void addFeature(Feature, CSSPropertyID = CSSPropertyInvalid);
typedef std::pair<Feature, CSSPropertyID> FeaturePropertyPair;
FeaturePropertyPair featureAt(size_t) const;
static bool propertyCreatesStackingContext(CSSPropertyID);
private:
WillChangeData()
{
}
struct AnimatableFeature {
static const int numCSSPropertyIDBits = 14;
COMPILE_ASSERT(numCSSProperties < (1 << numCSSPropertyIDBits), CSSPropertyID_should_fit_in_14_bits);
unsigned m_feature : 2;
unsigned m_cssPropertyID : numCSSPropertyIDBits;
Feature feature() const
{
return static_cast<Feature>(m_feature);
}
CSSPropertyID property() const
{
return feature() == Property ? static_cast<CSSPropertyID>(m_cssPropertyID) : CSSPropertyInvalid;
}
FeaturePropertyPair featurePropertyPair() const
{
return FeaturePropertyPair(feature(), property());
}
AnimatableFeature(Feature willChange, CSSPropertyID willChangeProperty = CSSPropertyInvalid)
{
switch (willChange) {
case Property:
ASSERT(willChangeProperty != CSSPropertyInvalid);
m_cssPropertyID = willChangeProperty;
FALLTHROUGH;
case ScrollPosition:
case Contents:
m_feature = static_cast<unsigned>(willChange);
break;
case Invalid:
ASSERT_NOT_REACHED();
break;
}
}
bool operator==(const AnimatableFeature& other) const
{
return m_feature == other.m_feature && m_cssPropertyID == other.m_cssPropertyID;
}
};
Vector<AnimatableFeature, 1> m_animatableFeatures;
bool m_canCreateStackingContext { false };
bool m_canTriggerCompositing { false };
bool m_canTriggerCompositingOnInline { false };
};
}