Source/WebCore/animation/KeyframeEffectStack.cpp

/*
 * Copyright (C) 2019 Apple Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions
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 *
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#include "config.h"
#include "KeyframeEffectStack.h"

#include "CSSAnimation.h"
#include "CSSTransition.h"
#include "KeyframeEffect.h"
#include "WebAnimation.h"
#include "WebAnimationUtilities.h"
#include <wtf/PointerComparison.h>

namespace WebCore {

KeyframeEffectStack::KeyframeEffectStack()
{
}

KeyframeEffectStack::~KeyframeEffectStack()
{
}

bool KeyframeEffectStack::addEffect(KeyframeEffect& effect)
{
    // To qualify for membership in an effect stack, an effect must have a target, an animation, a timeline and be relevant.
    // This method will be called in WebAnimation and KeyframeEffect as those properties change.
    if (!effect.targetStyleable() || !effect.animation() || !effect.animation()->timeline() || !effect.animation()->isRelevant())
        return false;

    effect.invalidate();
    m_effects.append(effect);
    m_isSorted = false;
    return true;
}

void KeyframeEffectStack::removeEffect(KeyframeEffect& effect)
{
    m_effects.removeFirst(&effect);
}

bool KeyframeEffectStack::requiresPseudoElement() const
{
    for (auto& effect : m_effects) {
        if (effect->requiresPseudoElement())
            return true;
    }
    return false;
}

bool KeyframeEffectStack::hasEffectWithImplicitKeyframes() const
{
    for (auto& effect : m_effects) {
        if (effect->hasImplicitKeyframes())
            return true;
    }
    return false;
}

bool KeyframeEffectStack::isCurrentlyAffectingProperty(CSSPropertyID property) const
{
    for (auto& effect : m_effects) {
        if (effect->isCurrentlyAffectingProperty(property) || effect->isRunningAcceleratedAnimationForProperty(property))
            return true;
    }
    return false;
}

Vector<WeakPtr<KeyframeEffect>> KeyframeEffectStack::sortedEffects()
{
    ensureEffectsAreSorted();
    return m_effects;
}

void KeyframeEffectStack::ensureEffectsAreSorted()
{
    if (m_isSorted || m_effects.size() < 2)
        return;

    std::stable_sort(m_effects.begin(), m_effects.end(), [&](auto& lhs, auto& rhs) {
        RELEASE_ASSERT(lhs.get());
        RELEASE_ASSERT(rhs.get());
        
        auto* lhsAnimation = lhs->animation();
        auto* rhsAnimation = rhs->animation();

        RELEASE_ASSERT(lhsAnimation);
        RELEASE_ASSERT(rhsAnimation);

        return compareAnimationsByCompositeOrder(*lhsAnimation, *rhsAnimation);
    });

    m_isSorted = true;
}

void KeyframeEffectStack::setCSSAnimationList(RefPtr<const AnimationList>&& cssAnimationList)
{
    m_cssAnimationList = WTFMove(cssAnimationList);
    // Since the list of animation names has changed, the sorting order of the animation effects may have changed as well.
    m_isSorted = false;
}

OptionSet<AnimationImpact> KeyframeEffectStack::applyKeyframeEffects(RenderStyle& targetStyle, const RenderStyle& previousLastStyleChangeEventStyle, const Style::ResolutionContext& resolutionContext)
{
    OptionSet<AnimationImpact> impact;

    auto transformRelatedPropertyChanged = [&]() -> bool {
        return !arePointingToEqualData(targetStyle.translate(), previousLastStyleChangeEventStyle.translate())
            || !arePointingToEqualData(targetStyle.scale(), previousLastStyleChangeEventStyle.scale())
            || !arePointingToEqualData(targetStyle.rotate(), previousLastStyleChangeEventStyle.rotate())
            || targetStyle.transform() != previousLastStyleChangeEventStyle.transform();
    }();

    for (const auto& effect : sortedEffects()) {
        ASSERT(effect->animation());
        effect->animation()->resolve(targetStyle, resolutionContext);

        if (effect->isRunningAccelerated() || effect->isAboutToRunAccelerated())
            impact.add(AnimationImpact::RequiresRecomposite);

        if (effect->triggersStackingContext())
            impact.add(AnimationImpact::ForcesStackingContext);

        if (transformRelatedPropertyChanged && effect->isRunningAcceleratedTransformRelatedAnimation())
            effect->transformRelatedPropertyDidChange();
    }

    return impact;
}

void KeyframeEffectStack::stopAcceleratingTransformRelatedProperties(UseAcceleratedAction useAcceleratedAction)
{
    for (auto& effect : m_effects)
        effect->stopAcceleratingTransformRelatedProperties(useAcceleratedAction);
}

} // namespace WebCore