static void setGradientAttributes(SVGGradientElement* element, RadialGradientAttributes& attributes, bool isRadial = true)
{
    if (!attributes.hasSpreadMethod() && element->spreadMethod()->isSpecified())
        attributes.setSpreadMethod(element->spreadMethod()->currentValue()->enumValue());

    if (!attributes.hasGradientUnits() && element->gradientUnits()->isSpecified())
        attributes.setGradientUnits(element->gradientUnits()->currentValue()->enumValue());

    if (!attributes.hasGradientTransform() && element->gradientTransform()->isSpecified()) {
        AffineTransform transform;
        element->gradientTransform()->currentValue()->concatenate(transform);
        attributes.setGradientTransform(transform);
    }

    if (!attributes.hasStops()) {
        const Vector<Gradient::ColorStop>& stops(element->buildStops());
        if (!stops.isEmpty())
            attributes.setStops(stops);
    }

    if (isRadial) {
        SVGRadialGradientElement* radial = toSVGRadialGradientElement(element);

        if (!attributes.hasCx() && radial->cx()->isSpecified())
            attributes.setCx(radial->cx()->currentValue());

        if (!attributes.hasCy() && radial->cy()->isSpecified())
            attributes.setCy(radial->cy()->currentValue());

        if (!attributes.hasR() && radial->r()->isSpecified())
            attributes.setR(radial->r()->currentValue());

        if (!attributes.hasFx() && radial->fx()->isSpecified())
            attributes.setFx(radial->fx()->currentValue());

        if (!attributes.hasFy() && radial->fy()->isSpecified())
            attributes.setFy(radial->fy()->currentValue());

        if (!attributes.hasFr() && radial->fr()->isSpecified())
            attributes.setFr(radial->fr()->currentValue());
    }
}
static void setGradientAttributes(SVGGradientElement& element, RadialGradientAttributes& attributes, bool isRadial = true)
{
    if (!attributes.hasSpreadMethod() && element.hasAttribute(SVGNames::spreadMethodAttr))
        attributes.setSpreadMethod(element.spreadMethod());

    if (!attributes.hasGradientUnits() && element.hasAttribute(SVGNames::gradientUnitsAttr))
        attributes.setGradientUnits(element.gradientUnits());

    if (!attributes.hasGradientTransform() && element.hasAttribute(SVGNames::gradientTransformAttr)) {
        AffineTransform transform;
        element.gradientTransform().concatenate(transform);
        attributes.setGradientTransform(transform);
    }

    if (!attributes.hasStops()) {
        const Vector<Gradient::ColorStop>& stops(element.buildStops());
        if (!stops.isEmpty())
            attributes.setStops(stops);
    }

    if (isRadial) {
        SVGRadialGradientElement& radial = downcast<SVGRadialGradientElement>(element);

        if (!attributes.hasCx() && element.hasAttribute(SVGNames::cxAttr))
            attributes.setCx(radial.cx());

        if (!attributes.hasCy() && element.hasAttribute(SVGNames::cyAttr))
            attributes.setCy(radial.cy());

        if (!attributes.hasR() && element.hasAttribute(SVGNames::rAttr))
            attributes.setR(radial.r());

        if (!attributes.hasFx() && element.hasAttribute(SVGNames::fxAttr))
            attributes.setFx(radial.fx());

        if (!attributes.hasFy() && element.hasAttribute(SVGNames::fyAttr))
            attributes.setFy(radial.fy());

        if (!attributes.hasFr() && element.hasAttribute(SVGNames::frAttr))
            attributes.setFr(radial.fr());
    }
}
RadialGradientAttributes SVGRadialGradientElement::collectGradientProperties() const
{
    RadialGradientAttributes attributes;
    HashSet<const SVGGradientElement*> processedGradients;

    bool isRadial = true;
    const SVGGradientElement* current = this;

    while (current) {
        if (!attributes.hasSpreadMethod() && current->hasAttribute(SVGNames::spreadMethodAttr))
            attributes.setSpreadMethod((GradientSpreadMethod) current->spreadMethod());

        if (!attributes.hasBoundingBoxMode() && current->hasAttribute(SVGNames::gradientUnitsAttr))
            attributes.setBoundingBoxMode(current->gradientUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX);

        if (!attributes.hasGradientTransform() && current->hasAttribute(SVGNames::gradientTransformAttr))
            attributes.setGradientTransform(current->gradientTransform()->consolidate().matrix());

        if (!attributes.hasStops()) {
            const Vector<SVGGradientStop>& stops(current->buildStops());
            if (!stops.isEmpty())
                attributes.setStops(stops);
        }

        if (isRadial) {
            const SVGRadialGradientElement* radial = static_cast<const SVGRadialGradientElement*>(current);

            if (!attributes.hasCx() && current->hasAttribute(SVGNames::cxAttr))
                attributes.setCx(radial->cx().valueAsPercentage());

            if (!attributes.hasCy() && current->hasAttribute(SVGNames::cyAttr))
                attributes.setCy(radial->cy().valueAsPercentage());

            if (!attributes.hasR() && current->hasAttribute(SVGNames::rAttr))
                attributes.setR(radial->r().valueAsPercentage());

            if (!attributes.hasFx() && current->hasAttribute(SVGNames::fxAttr))
                attributes.setFx(radial->fx().valueAsPercentage());

            if (!attributes.hasFy() && current->hasAttribute(SVGNames::fyAttr))
                attributes.setFy(radial->fy().valueAsPercentage());
        }

        processedGradients.add(current);

        // Respect xlink:href, take attributes from referenced element
        Node* refNode = ownerDocument()->getElementById(SVGURIReference::getTarget(current->href()));
        if (refNode && (refNode->hasTagName(SVGNames::radialGradientTag) || refNode->hasTagName(SVGNames::linearGradientTag))) {
            current = static_cast<const SVGGradientElement*>(const_cast<const Node*>(refNode));

            // Cycle detection
            if (processedGradients.contains(current))
                return RadialGradientAttributes();

            isRadial = current->gradientType() == RadialGradientPaintServer;
        } else
            current = 0;
    }

    // Handle default values for fx/fy
    if (!attributes.hasFx())
        attributes.setFx(attributes.cx());

    if (!attributes.hasFy())
        attributes.setFy(attributes.cy());

    return attributes;
}