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()));
}
bool SVGRadialGradientElement::collectGradientAttributes(RadialGradientAttributes& attributes)
{
if (!renderer())
return false;
WillBeHeapHashSet<RawPtrWillBeMember<SVGGradientElement> > processedGradients;
SVGGradientElement* current = this;
setGradientAttributes(current, attributes);
processedGradients.add(current);
while (true) {
// Respect xlink:href, take attributes from referenced element
Node* refNode = SVGURIReference::targetElementFromIRIString(current->href()->currentValue()->value(), treeScope());
if (refNode && isSVGGradientElement(*refNode)) {
current = toSVGGradientElement(refNode);
// Cycle detection
if (processedGradients.contains(current))
break;
if (!current->renderer())
return false;
setGradientAttributes(current, attributes, isSVGRadialGradientElement(*current));
processedGradients.add(current);
} else {
break;
}
}
// Handle default values for fx/fy
if (!attributes.hasFx())
attributes.setFx(attributes.cx());
if (!attributes.hasFy())
attributes.setFy(attributes.cy());
return true;
}
bool SVGRadialGradientElement::collectGradientAttributes(RadialGradientAttributes& attributes)
{
if (!renderer())
return false;
HashSet<SVGGradientElement*> processedGradients;
SVGGradientElement* current = this;
setGradientAttributes(*current, attributes);
processedGradients.add(current);
while (true) {
// Respect xlink:href, take attributes from referenced element
Node* refNode = SVGURIReference::targetElementFromIRIString(current->href(), document());
if (is<SVGGradientElement>(refNode)) {
current = downcast<SVGGradientElement>(refNode);
// Cycle detection
if (processedGradients.contains(current))
break;
if (!current->renderer())
return false;
setGradientAttributes(*current, attributes, current->hasTagName(SVGNames::radialGradientTag));
processedGradients.add(current);
} else
break;
}
// Handle default values for fx/fy
if (!attributes.hasFx())
attributes.setFx(attributes.cx());
if (!attributes.hasFy())
attributes.setFy(attributes.cy());
return true;
}
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;
}
FloatPoint RenderSVGResourceRadialGradient::centerPoint(const RadialGradientAttributes& attributes) const
{
return SVGLengthContext::resolvePoint(static_cast<const SVGElement*>(node()), attributes.gradientUnits(), attributes.cx(), attributes.cy());
}
FloatPoint LayoutSVGResourceRadialGradient::centerPoint(const RadialGradientAttributes& attributes) const
{
return SVGLengthContext::resolvePoint(element(), attributes.gradientUnits(), *attributes.cx(), *attributes.cy());
}