C++ BitArray::set方法代码示例

int main() {
  BitArray<10> bs;
  bs.set(100);
  assert(bs.test(100));
  bs.reset(100);
  assert(!bs.test(100));
  bs.flip(100);
  assert(bs.test(100));
}

void CSSAnimations::calculateTransitionUpdate(CSSAnimationUpdate& update, const Element* animatingElement, const ComputedStyle& style)
{
    if (!animatingElement)
        return;

    if (animatingElement->document().printing() || animatingElement->document().wasPrinting())
        return;

    ElementAnimations* elementAnimations = animatingElement->elementAnimations();
    const TransitionMap* activeTransitions = elementAnimations ? &elementAnimations->cssAnimations().m_transitions : nullptr;
    const CSSTransitionData* transitionData = style.transitions();

#if ENABLE(ASSERT)
    // In debug builds we verify that it would have been safe to avoid populating and testing listedProperties if the style recalc is due to animation.
    const bool animationStyleRecalc = false;
#else
    // In release builds we avoid the cost of checking for new and interrupted transitions if the style recalc is due to animation.
    const bool animationStyleRecalc = elementAnimations && elementAnimations->isAnimationStyleChange();
#endif

    BitArray<numCSSProperties> listedProperties;
    bool anyTransitionHadTransitionAll = false;
    const LayoutObject* layoutObject = animatingElement->layoutObject();
    if (!animationStyleRecalc && style.display() != NONE && layoutObject && layoutObject->style() && transitionData) {
        const ComputedStyle& oldStyle = *layoutObject->style();

        for (size_t i = 0; i < transitionData->propertyList().size(); ++i) {
            const CSSTransitionData::TransitionProperty& transitionProperty = transitionData->propertyList()[i];
            if (transitionProperty.propertyType != CSSTransitionData::TransitionKnownProperty)
                continue;

            CSSPropertyID property = resolveCSSPropertyID(transitionProperty.unresolvedProperty);
            bool animateAll = property == CSSPropertyAll;
            if (animateAll)
                anyTransitionHadTransitionAll = true;
            const StylePropertyShorthand& propertyList = animateAll ? CSSAnimations::propertiesForTransitionAll() : shorthandForProperty(property);
            // If not a shorthand we only execute one iteration of this loop, and refer to the property directly.
            for (unsigned j = 0; !j || j < propertyList.length(); ++j) {
                CSSPropertyID id = propertyList.length() ? propertyList.properties()[j] : property;
                ASSERT(id >= firstCSSProperty);

                if (!animateAll) {
                    if (CSSPropertyMetadata::isInterpolableProperty(id))
                        listedProperties.set(id - firstCSSProperty);
                    else
                        continue;
                }

                // FIXME: We should transition if an !important property changes even when an animation is running,
                // but this is a bit hard to do with the current applyMatchedProperties system.
                PropertyHandle property = PropertyHandle(id);
                if (!update.activeInterpolationsForAnimations().contains(property)
                    && (!elementAnimations || !elementAnimations->cssAnimations().m_previousActiveInterpolationsForAnimations.contains(property))) {
                    calculateTransitionUpdateForProperty(id, *transitionData, i, oldStyle, style, activeTransitions, update, animatingElement);
                }
            }
        }
    }

    if (activeTransitions) {
        for (const auto& entry : *activeTransitions) {
            CSSPropertyID id = entry.key;
            if (!anyTransitionHadTransitionAll && !animationStyleRecalc && !listedProperties.get(id - firstCSSProperty)) {
                // TODO: Figure out why this fails on Chrome OS login page. crbug.com/365507
                // ASSERT(animation.playStateInternal() == Animation::Finished || !(elementAnimations && elementAnimations->isAnimationStyleChange()));
                update.cancelTransition(id);
            } else if (entry.value.animation->finishedInternal()) {
                update.finishTransition(id);
            }
        }
    }
}

String StylePropertySerializer::asText() const
{
    StringBuilder result;

    BitArray<numCSSProperties> shorthandPropertyUsed;
    BitArray<numCSSProperties> shorthandPropertyAppeared;

    unsigned size = m_propertySet.propertyCount();
    unsigned numDecls = 0;
    for (unsigned n = 0; n < size; ++n) {
        StylePropertySet::PropertyReference property = m_propertySet.propertyAt(n);
        CSSPropertyID propertyID = property.id();
        // Only enabled or internal properties should be part of the style.
        ASSERT(RuntimeCSSEnabled::isCSSPropertyEnabled(propertyID) || isInternalProperty(propertyID));
        CSSPropertyID shorthandPropertyID = CSSPropertyInvalid;
        CSSPropertyID borderFallbackShorthandProperty = CSSPropertyInvalid;
        String value;

        switch (propertyID) {
        case CSSPropertyBackgroundAttachment:
        case CSSPropertyBackgroundClip:
        case CSSPropertyBackgroundColor:
        case CSSPropertyBackgroundImage:
        case CSSPropertyBackgroundOrigin:
        case CSSPropertyBackgroundPositionX:
        case CSSPropertyBackgroundPositionY:
        case CSSPropertyBackgroundSize:
        case CSSPropertyBackgroundRepeatX:
        case CSSPropertyBackgroundRepeatY:
            shorthandPropertyAppeared.set(CSSPropertyBackground - firstCSSProperty);
            continue;
        case CSSPropertyContent:
            if (property.value()->isValueList())
                value = toCSSValueList(property.value())->customCSSText(AlwaysQuoteCSSString);
            break;
        case CSSPropertyBorderTopWidth:
        case CSSPropertyBorderRightWidth:
        case CSSPropertyBorderBottomWidth:
        case CSSPropertyBorderLeftWidth:
            if (!borderFallbackShorthandProperty)
                borderFallbackShorthandProperty = CSSPropertyBorderWidth;
        case CSSPropertyBorderTopStyle:
        case CSSPropertyBorderRightStyle:
        case CSSPropertyBorderBottomStyle:
        case CSSPropertyBorderLeftStyle:
            if (!borderFallbackShorthandProperty)
                borderFallbackShorthandProperty = CSSPropertyBorderStyle;
        case CSSPropertyBorderTopColor:
        case CSSPropertyBorderRightColor:
        case CSSPropertyBorderBottomColor:
        case CSSPropertyBorderLeftColor:
            if (!borderFallbackShorthandProperty)
                borderFallbackShorthandProperty = CSSPropertyBorderColor;

            // FIXME: Deal with cases where only some of border-(top|right|bottom|left) are specified.
            if (!shorthandPropertyAppeared.get(CSSPropertyBorder - firstCSSProperty)) {
                value = borderPropertyValue(ReturnNullOnUncommonValues);
                if (value.isNull())
                    shorthandPropertyAppeared.set(CSSPropertyBorder - firstCSSProperty);
                else
                    shorthandPropertyID = CSSPropertyBorder;
            } else if (shorthandPropertyUsed.get(CSSPropertyBorder - firstCSSProperty))
                shorthandPropertyID = CSSPropertyBorder;
            if (!shorthandPropertyID)
                shorthandPropertyID = borderFallbackShorthandProperty;
            break;
        case CSSPropertyWebkitBorderHorizontalSpacing:
        case CSSPropertyWebkitBorderVerticalSpacing:
            shorthandPropertyID = CSSPropertyBorderSpacing;
            break;
        case CSSPropertyFontFamily:
        case CSSPropertyLineHeight:
        case CSSPropertyFontSize:
        case CSSPropertyFontStyle:
        case CSSPropertyFontVariant:
        case CSSPropertyFontWeight:
            // Don't use CSSPropertyFont because old UAs can't recognize them but are important for editing.
            break;
        case CSSPropertyListStyleType:
        case CSSPropertyListStylePosition:
        case CSSPropertyListStyleImage:
            shorthandPropertyID = CSSPropertyListStyle;
            break;
        case CSSPropertyMarginTop:
        case CSSPropertyMarginRight:
        case CSSPropertyMarginBottom:
        case CSSPropertyMarginLeft:
            shorthandPropertyID = CSSPropertyMargin;
            break;
        case CSSPropertyOutlineWidth:
        case CSSPropertyOutlineStyle:
        case CSSPropertyOutlineColor:
            shorthandPropertyID = CSSPropertyOutline;
            break;
        case CSSPropertyOverflowX:
        case CSSPropertyOverflowY:
            shorthandPropertyID = CSSPropertyOverflow;
            break;
        case CSSPropertyPaddingTop:
        case CSSPropertyPaddingRight:
//.........这里部分代码省略.........

void CSSAnimations::calculateTransitionUpdate(CSSAnimationUpdate* update, const Element* element, const RenderStyle& style)
{
    if (!element)
        return;

    ActiveAnimations* activeAnimations = element->activeAnimations();
    const TransitionMap* activeTransitions = activeAnimations ? &activeAnimations->cssAnimations().m_transitions : 0;
    const CSSTransitionData* transitionData = style.transitions();

#if ENABLE(ASSERT)
    // In debug builds we verify that it would have been safe to avoid populating and testing listedProperties if the style recalc is due to animation.
    const bool animationStyleRecalc = false;
#else
    // In release builds we avoid the cost of checking for new and interrupted transitions if the style recalc is due to animation.
    const bool animationStyleRecalc = activeAnimations && activeAnimations->isAnimationStyleChange();
#endif

    BitArray<numCSSProperties> listedProperties;
    bool anyTransitionHadTransitionAll = false;
    const RenderObject* renderer = element->renderer();
    if (!animationStyleRecalc && style.display() != NONE && renderer && renderer->style() && transitionData) {
        const RenderStyle& oldStyle = *renderer->style();

        for (size_t i = 0; i < transitionData->propertyList().size(); ++i) {
            const CSSTransitionData::TransitionProperty& transitionProperty = transitionData->propertyList()[i];
            CSSTransitionData::TransitionPropertyType mode = transitionProperty.propertyType;
            CSSPropertyID property = transitionProperty.propertyId;
            if (mode == CSSTransitionData::TransitionNone || mode == CSSTransitionData::TransitionUnknown)
                continue;

            bool animateAll = mode == CSSTransitionData::TransitionAll;
            ASSERT(animateAll || mode == CSSTransitionData::TransitionSingleProperty);
            if (animateAll)
                anyTransitionHadTransitionAll = true;
            const StylePropertyShorthand& propertyList = animateAll ? CSSAnimations::animatableProperties() : shorthandForProperty(property);
            // If not a shorthand we only execute one iteration of this loop, and refer to the property directly.
            for (unsigned j = 0; !j || j < propertyList.length(); ++j) {
                CSSPropertyID id = propertyList.length() ? propertyList.properties()[j] : property;
                CSSPropertyID eventId = id;

                if (!animateAll) {
                    id = propertyForAnimation(id);
                    if (CSSPropertyMetadata::isAnimatableProperty(id))
                        listedProperties.set(id);
                    else
                        continue;
                }

                if (!update->activeInterpolationsForAnimations().contains(id)
                    && (!activeAnimations || !activeAnimations->cssAnimations().m_previousActiveInterpolationsForAnimations.contains(id))) {
                    calculateTransitionUpdateForProperty(id, eventId, *transitionData, i, oldStyle, style, activeTransitions, update, element);
                }
            }
        }
    }

    if (activeTransitions) {
        for (TransitionMap::const_iterator iter = activeTransitions->begin(); iter != activeTransitions->end(); ++iter) {
            const AnimationPlayer& player = *iter->value.player;
            CSSPropertyID id = iter->key;
            if (player.finishedInternal() || (!anyTransitionHadTransitionAll && !animationStyleRecalc && !listedProperties.get(id))) {
                // TODO: Figure out why this fails on Chrome OS login page. crbug.com/365507
                // ASSERT(player.finishedInternal() || !(activeAnimations && activeAnimations->isAnimationStyleChange()));
                update->cancelTransition(id);
            }
        }
    }
}