| /* |
| Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org> |
| 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org> |
| 2008 Eric Seidel <eric@webkit.org> |
| 2008 Dirk Schulze <krit@webkit.org> |
| |
| This library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Library General Public |
| License as published by the Free Software Foundation; either |
| version 2 of the License, or (at your option) any later version. |
| |
| This library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Library General Public License for more details. |
| |
| You should have received a copy of the GNU Library General Public License |
| along with this library; see the file COPYING.LIB. If not, write to |
| the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| Boston, MA 02110-1301, USA. |
| */ |
| |
| #include "config.h" |
| |
| #if ENABLE(SVG) |
| #include "SVGRadialGradientElement.h" |
| |
| #include "FloatConversion.h" |
| #include "FloatPoint.h" |
| #include "MappedAttribute.h" |
| #include "RadialGradientAttributes.h" |
| #include "RenderObject.h" |
| #include "SVGLength.h" |
| #include "SVGNames.h" |
| #include "SVGPaintServerRadialGradient.h" |
| #include "SVGStopElement.h" |
| #include "SVGTransform.h" |
| #include "SVGTransformList.h" |
| #include "SVGUnitTypes.h" |
| |
| namespace WebCore { |
| |
| SVGRadialGradientElement::SVGRadialGradientElement(const QualifiedName& tagName, Document* doc) |
| : SVGGradientElement(tagName, doc) |
| , m_cx(this, SVGNames::cxAttr, LengthModeWidth, "50%") |
| , m_cy(this, SVGNames::cyAttr, LengthModeHeight, "50%") |
| , m_r(this, SVGNames::rAttr, LengthModeOther, "50%") |
| , m_fx(this, SVGNames::fxAttr, LengthModeWidth) |
| , m_fy(this, SVGNames::fyAttr, LengthModeHeight) |
| { |
| // Spec: If the cx/cy/r attribute is not specified, the effect is as if a value of "50%" were specified. |
| } |
| |
| SVGRadialGradientElement::~SVGRadialGradientElement() |
| { |
| } |
| |
| void SVGRadialGradientElement::parseMappedAttribute(MappedAttribute* attr) |
| { |
| if (attr->name() == SVGNames::cxAttr) |
| setCxBaseValue(SVGLength(LengthModeWidth, attr->value())); |
| else if (attr->name() == SVGNames::cyAttr) |
| setCyBaseValue(SVGLength(LengthModeHeight, attr->value())); |
| else if (attr->name() == SVGNames::rAttr) { |
| setRBaseValue(SVGLength(LengthModeOther, attr->value())); |
| if (rBaseValue().value(this) < 0.0) |
| document()->accessSVGExtensions()->reportError("A negative value for radial gradient radius <r> is not allowed"); |
| } else if (attr->name() == SVGNames::fxAttr) |
| setFxBaseValue(SVGLength(LengthModeWidth, attr->value())); |
| else if (attr->name() == SVGNames::fyAttr) |
| setFyBaseValue(SVGLength(LengthModeHeight, attr->value())); |
| else |
| SVGGradientElement::parseMappedAttribute(attr); |
| } |
| |
| void SVGRadialGradientElement::svgAttributeChanged(const QualifiedName& attrName) |
| { |
| SVGGradientElement::svgAttributeChanged(attrName); |
| |
| if (!m_resource) |
| return; |
| |
| if (attrName == SVGNames::cxAttr || attrName == SVGNames::cyAttr || |
| attrName == SVGNames::fxAttr || attrName == SVGNames::fyAttr || |
| attrName == SVGNames::rAttr) |
| m_resource->invalidate(); |
| } |
| |
| 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()); |
| } |
| |
| 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; |
| } |
| } |
| |
| #endif // ENABLE(SVG) |
