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/*
* Copyright (C) 2019 Apple 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. AND ITS CONTRIBUTORS ``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 INC. OR ITS 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.
*/
#pragma once
#include "CascadeLevel.h"
#include "MatchResult.h"
#include "WebAnimationTypes.h"
#include <bitset>
namespace WebCore {
class StyleResolver;
namespace Style {
class PropertyCascade {
WTF_MAKE_FAST_ALLOCATED;
public:
enum class PropertyType : uint8_t {
NonInherited = 1 << 0,
Inherited = 1 << 1,
VariableReference = 1 << 2,
AfterAnimation = 1 << 3,
AfterTransition = 1 << 4
};
static constexpr OptionSet<PropertyType> allProperties() { return { PropertyType::NonInherited, PropertyType::Inherited }; }
PropertyCascade(const MatchResult&, CascadeLevel, OptionSet<PropertyType> includedProperties, const HashSet<AnimatableProperty>* = nullptr);
PropertyCascade(const PropertyCascade&, CascadeLevel, std::optional<ScopeOrdinal> rollbackScope = { }, std::optional<CascadeLayerPriority> maximumCascadeLayerPriorityForRollback = { });
~PropertyCascade();
struct Property {
CSSPropertyID id;
CascadeLevel cascadeLevel;
ScopeOrdinal styleScopeOrdinal;
CascadeLayerPriority cascadeLayerPriority;
FromStyleAttribute fromStyleAttribute;
std::array<CSSValue*, 3> cssValue; // Values for link match states MatchDefault, MatchLink and MatchVisited
};
bool isEmpty() const { return m_propertyIsPresent.none() && !m_seenDeferredPropertyCount; }
bool hasNormalProperty(CSSPropertyID) const;
const Property& normalProperty(CSSPropertyID) const;
bool hasDeferredProperty(CSSPropertyID) const;
const Property& deferredProperty(CSSPropertyID) const;
const Property* lastDeferredPropertyResolvingRelated(CSSPropertyID, TextDirection, WritingMode) const;
bool hasCustomProperty(const AtomString&) const;
const Property& customProperty(const AtomString&) const;
std::span<const CSSPropertyID> deferredPropertyIDs() const;
const HashMap<AtomString, Property>& customProperties() const { return m_customProperties; }
const HashSet<AnimatableProperty> overriddenAnimatedProperties() const;
private:
void buildCascade();
bool addNormalMatches(CascadeLevel);
void addImportantMatches(CascadeLevel);
bool addMatch(const MatchedProperties&, CascadeLevel, bool important);
bool shouldApplyAfterAnimation(const StyleProperties::PropertyReference&);
void set(CSSPropertyID, CSSValue&, const MatchedProperties&, CascadeLevel);
void setDeferred(CSSPropertyID, CSSValue&, const MatchedProperties&, CascadeLevel);
static void setPropertyInternal(Property&, CSSPropertyID, CSSValue&, const MatchedProperties&, CascadeLevel);
bool hasProperty(CSSPropertyID, const CSSValue&);
unsigned deferredPropertyIndex(CSSPropertyID) const;
void setDeferredPropertyIndex(CSSPropertyID, unsigned);
void sortDeferredPropertyIDs();
const MatchResult& m_matchResult;
const OptionSet<PropertyType> m_includedProperties;
const CascadeLevel m_maximumCascadeLevel;
const std::optional<ScopeOrdinal> m_rollbackScope;
const std::optional<CascadeLayerPriority> m_maximumCascadeLayerPriorityForRollback;
struct AnimationLayer {
AnimationLayer(const HashSet<AnimatableProperty>&);
const HashSet<AnimatableProperty>& properties;
HashSet<AnimatableProperty> overriddenProperties;
bool hasCustomProperties { false };
bool hasFontSize { false };
bool hasLineHeight { false };
};
std::optional<AnimationLayer> m_animationLayer;
// The CSSPropertyID enum is sorted like this:
// 1. CSSPropertyInvalid and CSSPropertyCustom.
// 2. Normal longhand properties (high priority ones followed by low priority ones).
// 3. Deferred longhand properties.
// 4. Shorthand properties.
//
// 'm_properties' is used for both normal and deferred longhands, so it has size 'lastDeferredProperty + 1'.
// It could actually be 2 units smaller, but then we would have to subtract 'firstCSSProperty', which may not be worth it.
// 'm_propertyIsPresent' is not used for deferred properties, so we only need to cover up to the last low priority one.
std::array<Property, lastDeferredProperty + 1> m_properties;
std::bitset<lastLowPriorityProperty + 1> m_propertyIsPresent;
static constexpr unsigned deferredPropertyCount = lastDeferredProperty - firstDeferredProperty + 1;
std::array<unsigned, deferredPropertyCount> m_deferredPropertyIndices { };
unsigned m_lastIndexForDeferred { 0 };
std::array<CSSPropertyID, deferredPropertyCount> m_deferredPropertyIDs { };
unsigned m_seenDeferredPropertyCount { 0 };
CSSPropertyID m_lowestSeenDeferredProperty { lastDeferredProperty };
CSSPropertyID m_highestSeenDeferredProperty { firstDeferredProperty };
HashMap<AtomString, Property> m_customProperties;
};
inline bool PropertyCascade::hasNormalProperty(CSSPropertyID id) const
{
ASSERT(id < firstDeferredProperty);
return m_propertyIsPresent[id];
}
inline const PropertyCascade::Property& PropertyCascade::normalProperty(CSSPropertyID id) const
{
ASSERT(hasNormalProperty(id));
return m_properties[id];
}
inline unsigned PropertyCascade::deferredPropertyIndex(CSSPropertyID id) const
{
ASSERT(id >= firstDeferredProperty);
ASSERT(id <= lastDeferredProperty);
return m_deferredPropertyIndices[id - firstDeferredProperty];
}
inline void PropertyCascade::setDeferredPropertyIndex(CSSPropertyID id, unsigned index)
{
ASSERT(id >= firstDeferredProperty);
ASSERT(id <= lastDeferredProperty);
m_deferredPropertyIndices[id - firstDeferredProperty] = index;
}
inline bool PropertyCascade::hasDeferredProperty(CSSPropertyID id) const
{
return deferredPropertyIndex(id);
}
inline const PropertyCascade::Property& PropertyCascade::deferredProperty(CSSPropertyID id) const
{
ASSERT(hasDeferredProperty(id));
return m_properties[id];
}
inline std::span<const CSSPropertyID> PropertyCascade::deferredPropertyIDs() const
{
return { m_deferredPropertyIDs.data(), m_seenDeferredPropertyCount };
}
inline bool PropertyCascade::hasCustomProperty(const AtomString& name) const
{
return m_customProperties.contains(name);
}
inline const PropertyCascade::Property& PropertyCascade::customProperty(const AtomString& name) const
{
ASSERT(hasCustomProperty(name));
return m_customProperties.find(name)->value;
}
}
}
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