void RenderSVGResourceRadialGradient::buildGradient(GradientData* gradientData, SVGGradientElement* gradientElement) const
{
    SVGRadialGradientElement* radialGradientElement = static_cast<SVGRadialGradientElement*>(gradientElement);
    RadialGradientAttributes attributes = radialGradientElement->collectGradientProperties();

    // Determine gradient focal/center points and radius
    FloatPoint focalPoint;
    FloatPoint centerPoint;
    float radius;
    radialGradientElement->calculateFocalCenterPointsAndRadius(attributes, focalPoint, centerPoint, radius);

    gradientData->gradient = Gradient::create(focalPoint,
                                              0.0f, // SVG does not support a "focus radius"
                                              centerPoint,
                                              radius);

    gradientData->gradient->setSpreadMethod(attributes.spreadMethod());

    // Record current gradient transform
    gradientData->transform = attributes.gradientTransform();
    gradientData->boundingBoxMode = attributes.boundingBoxMode();

    // Add stops
    addStops(gradientData, attributes.stops());
}
void SVGRadialGradientElement::buildGradient() const
{
    RadialGradientAttributes attributes = collectGradientProperties();

    RefPtr<SVGPaintServerRadialGradient> radialGradient = WTF::static_pointer_cast<SVGPaintServerRadialGradient>(m_resource);

    double adjustedFocusX = attributes.fx();
    double adjustedFocusY = attributes.fy();

    double fdx = attributes.fx() - attributes.cx();
    double fdy = attributes.fy() - attributes.cy();

    // Spec: If (fx, fy) lies outside the circle defined by (cx, cy) and
    // r, set (fx, fy) to the point of intersection of the line through
    // (fx, fy) and the circle.
    if (sqrt(fdx * fdx + fdy * fdy) > attributes.r()) {
        double angle = atan2(attributes.fy() * 100.0, attributes.fx() * 100.0);
        adjustedFocusX = cos(angle) * attributes.r();
        adjustedFocusY = sin(angle) * attributes.r();
    }

    FloatPoint focalPoint = FloatPoint::narrowPrecision(attributes.fx(), attributes.fy());
    FloatPoint centerPoint = FloatPoint::narrowPrecision(attributes.cx(), attributes.cy());

    RefPtr<Gradient> gradient = Gradient::create(
        FloatPoint::narrowPrecision(adjustedFocusX, adjustedFocusY),
        0.f, // SVG does not support a "focus radius"
        centerPoint,
        narrowPrecisionToFloat(attributes.r()));
    gradient->setSpreadMethod(attributes.spreadMethod());

    Vector<SVGGradientStop> stops = attributes.stops();
    float previousOffset = 0.0f;
    for (unsigned i = 0; i < stops.size(); ++i) {
         float offset = std::min(std::max(previousOffset, stops[i].first), 1.0f);
         previousOffset = offset;
         gradient->addColorStop(offset, stops[i].second);
    }

    radialGradient->setGradient(gradient);

    if (attributes.stops().isEmpty())
        return;

    radialGradient->setBoundingBoxMode(attributes.boundingBoxMode());
    radialGradient->setGradientTransform(attributes.gradientTransform());
    radialGradient->setGradientCenter(centerPoint);
    radialGradient->setGradientFocal(focalPoint);
    radialGradient->setGradientRadius(narrowPrecisionToFloat(attributes.r()));
    radialGradient->setGradientStops(attributes.stops());
}
void SVGRadialGradientElement::buildGradient() const
{
    RadialGradientAttributes attributes = collectGradientProperties();

    // If we didn't find any gradient containing stop elements, ignore the request.
    if (attributes.stops().isEmpty())
        return;

    RefPtr<SVGPaintServerRadialGradient> radialGradient = WTF::static_pointer_cast<SVGPaintServerRadialGradient>(m_resource);

    radialGradient->setGradientStops(attributes.stops());
    radialGradient->setBoundingBoxMode(attributes.boundingBoxMode());
    radialGradient->setGradientSpreadMethod(attributes.spreadMethod()); 
    radialGradient->setGradientTransform(attributes.gradientTransform());
    radialGradient->setGradientCenter(FloatPoint::narrowPrecision(attributes.cx(), attributes.cy()));
    radialGradient->setGradientFocal(FloatPoint::narrowPrecision(attributes.fx(), attributes.fy()));
    radialGradient->setGradientRadius(narrowPrecisionToFloat(attributes.r()));
}
void writeSVGResourceContainer(TextStream& ts, const RenderObject& object, int indent)
{
    writeStandardPrefix(ts, object, indent);

    Element* element = toElement(object.node());
    const AtomicString& id = element->getIdAttribute();
    writeNameAndQuotedValue(ts, "id", id);

    RenderSVGResourceContainer* resource = const_cast<RenderObject&>(object).toRenderSVGResourceContainer();
    ASSERT(resource);

    if (resource->resourceType() == MaskerResourceType) {
        RenderSVGResourceMasker* masker = toRenderSVGResourceMasker(resource);
        writeNameValuePair(ts, "maskUnits", masker->maskUnits());
        writeNameValuePair(ts, "maskContentUnits", masker->maskContentUnits());
        ts << "\n";
    } else if (resource->resourceType() == FilterResourceType) {
        RenderSVGResourceFilter* filter = toRenderSVGResourceFilter(resource);
        writeNameValuePair(ts, "filterUnits", filter->filterUnits());
        writeNameValuePair(ts, "primitiveUnits", filter->primitiveUnits());
        ts << "\n";
        // Creating a placeholder filter which is passed to the builder.
        FloatRect dummyRect;
        RefPtr<SVGFilter> dummyFilter = SVGFilter::create(AffineTransform(), dummyRect, dummyRect, dummyRect, true);
        if (RefPtr<SVGFilterBuilder> builder = filter->buildPrimitives(dummyFilter.get())) {
            if (FilterEffect* lastEffect = builder->lastEffect())
                lastEffect->externalRepresentation(ts, indent + 1);
        }
    } else if (resource->resourceType() == ClipperResourceType) {
        writeNameValuePair(ts, "clipPathUnits", toRenderSVGResourceClipper(resource)->clipPathUnits());
        ts << "\n";
    } else if (resource->resourceType() == MarkerResourceType) {
        RenderSVGResourceMarker* marker = toRenderSVGResourceMarker(resource);
        writeNameValuePair(ts, "markerUnits", marker->markerUnits());
        ts << " [ref at " << marker->referencePoint() << "]";
        ts << " [angle=";
        if (marker->angle() == -1)
            ts << "auto" << "]\n";
        else
            ts << marker->angle() << "]\n";
    } else if (resource->resourceType() == PatternResourceType) {
        RenderSVGResourcePattern* pattern = static_cast<RenderSVGResourcePattern*>(resource);

        // Dump final results that are used for rendering. No use in asking SVGPatternElement for its patternUnits(), as it may
        // link to other patterns using xlink:href, we need to build the full inheritance chain, aka. collectPatternProperties()
        PatternAttributes attributes;
        toSVGPatternElement(pattern->element())->collectPatternAttributes(attributes);

        writeNameValuePair(ts, "patternUnits", attributes.patternUnits());
        writeNameValuePair(ts, "patternContentUnits", attributes.patternContentUnits());

        AffineTransform transform = attributes.patternTransform();
        if (!transform.isIdentity())
            ts << " [patternTransform=" << transform << "]";
        ts << "\n";
    } else if (resource->resourceType() == LinearGradientResourceType) {
        RenderSVGResourceLinearGradient* gradient = static_cast<RenderSVGResourceLinearGradient*>(resource);

        // Dump final results that are used for rendering. No use in asking SVGGradientElement for its gradientUnits(), as it may
        // link to other gradients using xlink:href, we need to build the full inheritance chain, aka. collectGradientProperties()
        LinearGradientAttributes attributes;
        toSVGLinearGradientElement(gradient->element())->collectGradientAttributes(attributes);
        writeCommonGradientProperties(ts, attributes.spreadMethod(), attributes.gradientTransform(), attributes.gradientUnits());

        ts << " [start=" << gradient->startPoint(attributes) << "] [end=" << gradient->endPoint(attributes) << "]\n";
    }  else if (resource->resourceType() == RadialGradientResourceType) {
        RenderSVGResourceRadialGradient* gradient = toRenderSVGResourceRadialGradient(resource);

        // Dump final results that are used for rendering. No use in asking SVGGradientElement for its gradientUnits(), as it may
        // link to other gradients using xlink:href, we need to build the full inheritance chain, aka. collectGradientProperties()
        RadialGradientAttributes attributes;
        toSVGRadialGradientElement(gradient->element())->collectGradientAttributes(attributes);
        writeCommonGradientProperties(ts, attributes.spreadMethod(), attributes.gradientTransform(), attributes.gradientUnits());

        FloatPoint focalPoint = gradient->focalPoint(attributes);
        FloatPoint centerPoint = gradient->centerPoint(attributes);
        float radius = gradient->radius(attributes);
        float focalRadius = gradient->focalRadius(attributes);

        ts << " [center=" << centerPoint << "] [focal=" << focalPoint << "] [radius=" << radius << "] [focalRadius=" << focalRadius << "]\n";
    } else
        ts << "\n";
    writeChildren(ts, object, indent);
}
void writeSVGResourceContainer(TextStream& ts, const RenderObject& object, int indent)
{
    writeStandardPrefix(ts, object, indent);

    Element* element = static_cast<Element*>(object.node());
    const AtomicString& id = element->getIdAttribute();
    writeNameAndQuotedValue(ts, "id", id);    

    RenderSVGResourceContainer* resource = const_cast<RenderObject&>(object).toRenderSVGResourceContainer();
    ASSERT(resource);

    if (resource->resourceType() == MaskerResourceType) {
        RenderSVGResourceMasker* masker = static_cast<RenderSVGResourceMasker*>(resource);
        writeNameValuePair(ts, "maskUnits", masker->maskUnits());
        writeNameValuePair(ts, "maskContentUnits", masker->maskContentUnits());
        ts << "\n";
#if ENABLE(FILTERS)
    } else if (resource->resourceType() == FilterResourceType) {
        RenderSVGResourceFilter* filter = static_cast<RenderSVGResourceFilter*>(resource);
        writeNameValuePair(ts, "filterUnits", filter->filterUnits());
        writeNameValuePair(ts, "primitiveUnits", filter->primitiveUnits());
        ts << "\n";
        if (RefPtr<SVGFilterBuilder> builder = filter->buildPrimitives()) {
            if (FilterEffect* lastEffect = builder->lastEffect())
                lastEffect->externalRepresentation(ts, indent + 1);
        }      
#endif
    } else if (resource->resourceType() == ClipperResourceType) {
        RenderSVGResourceClipper* clipper = static_cast<RenderSVGResourceClipper*>(resource);
        writeNameValuePair(ts, "clipPathUnits", clipper->clipPathUnits());
        ts << "\n";
    } else if (resource->resourceType() == MarkerResourceType) {
        RenderSVGResourceMarker* marker = static_cast<RenderSVGResourceMarker*>(resource);
        writeNameValuePair(ts, "markerUnits", marker->markerUnits());
        ts << " [ref at " << marker->referencePoint() << "]";
        ts << " [angle=";
        if (marker->angle() == -1)
            ts << "auto" << "]\n";
        else
            ts << marker->angle() << "]\n";
    } else if (resource->resourceType() == PatternResourceType) {
        RenderSVGResourcePattern* pattern = static_cast<RenderSVGResourcePattern*>(resource);

        // Dump final results that are used for rendering. No use in asking SVGPatternElement for its patternUnits(), as it may
        // link to other patterns using xlink:href, we need to build the full inheritance chain, aka. collectPatternProperties()
        PatternAttributes attributes = static_cast<SVGPatternElement*>(pattern->node())->collectPatternProperties();
        writeNameValuePair(ts, "patternUnits", boundingBoxModeString(attributes.boundingBoxMode()));
        writeNameValuePair(ts, "patternContentUnits", boundingBoxModeString(attributes.boundingBoxModeContent()));

        AffineTransform transform = attributes.patternTransform();
        if (!transform.isIdentity())
            ts << " [patternTransform=" << transform << "]";
        ts << "\n";
    } else if (resource->resourceType() == LinearGradientResourceType) {
        RenderSVGResourceLinearGradient* gradient = static_cast<RenderSVGResourceLinearGradient*>(resource);

        // Dump final results that are used for rendering. No use in asking SVGGradientElement for its gradientUnits(), as it may
        // link to other gradients using xlink:href, we need to build the full inheritance chain, aka. collectGradientProperties()
        SVGLinearGradientElement* linearGradientElement = static_cast<SVGLinearGradientElement*>(gradient->node());

        LinearGradientAttributes attributes = linearGradientElement->collectGradientProperties();
        writeCommonGradientProperties(ts, attributes.spreadMethod(), attributes.gradientTransform(), attributes.boundingBoxMode());

        FloatPoint startPoint;
        FloatPoint endPoint;
        linearGradientElement->calculateStartEndPoints(attributes, startPoint, endPoint);

        ts << " [start=" << startPoint << "] [end=" << endPoint << "]\n";
    }  else if (resource->resourceType() == RadialGradientResourceType) {
        RenderSVGResourceRadialGradient* gradient = static_cast<RenderSVGResourceRadialGradient*>(resource);

        // Dump final results that are used for rendering. No use in asking SVGGradientElement for its gradientUnits(), as it may
        // link to other gradients using xlink:href, we need to build the full inheritance chain, aka. collectGradientProperties()
        SVGRadialGradientElement* radialGradientElement = static_cast<SVGRadialGradientElement*>(gradient->node());

        RadialGradientAttributes attributes = radialGradientElement->collectGradientProperties();
        writeCommonGradientProperties(ts, attributes.spreadMethod(), attributes.gradientTransform(), attributes.boundingBoxMode());

        FloatPoint focalPoint;
        FloatPoint centerPoint;
        float radius;
        radialGradientElement->calculateFocalCenterPointsAndRadius(attributes, focalPoint, centerPoint, radius);

        ts << " [center=" << centerPoint << "] [focal=" << focalPoint << "] [radius=" << radius << "]\n";
    } else
        ts << "\n";
    writeChildren(ts, object, indent);
}