diff -r 000000000000 -r 4f2f89ce4247 WebCore/svg/SVGLinearGradientElement.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/svg/SVGLinearGradientElement.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,191 @@
+/*
+    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>
+    Copyright (C) Research In Motion Limited 2010. All rights reserved.
+
+    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 "SVGLinearGradientElement.h"
+
+#include "Attribute.h"
+#include "Document.h"
+#include "FloatPoint.h"
+#include "LinearGradientAttributes.h"
+#include "RenderSVGResourceLinearGradient.h"
+#include "SVGLength.h"
+#include "SVGNames.h"
+#include "SVGTransform.h"
+#include "SVGTransformList.h"
+#include "SVGUnitTypes.h"
+
+namespace WebCore {
+
+SVGLinearGradientElement::SVGLinearGradientElement(const QualifiedName& tagName, Document* doc)
+    : SVGGradientElement(tagName, doc)
+    , m_x1(LengthModeWidth)
+    , m_y1(LengthModeHeight)
+    , m_x2(LengthModeWidth, "100%")
+    , m_y2(LengthModeHeight)
+{
+    // Spec: If the x2 attribute is not specified, the effect is as if a value of "100%" were specified.
+}
+
+SVGLinearGradientElement::~SVGLinearGradientElement()
+{
+}
+
+void SVGLinearGradientElement::parseMappedAttribute(Attribute* attr)
+{
+    if (attr->name() == SVGNames::x1Attr)
+        setX1BaseValue(SVGLength(LengthModeWidth, attr->value()));
+    else if (attr->name() == SVGNames::y1Attr)
+        setY1BaseValue(SVGLength(LengthModeHeight, attr->value()));
+    else if (attr->name() == SVGNames::x2Attr)
+        setX2BaseValue(SVGLength(LengthModeWidth, attr->value()));
+    else if (attr->name() == SVGNames::y2Attr)
+        setY2BaseValue(SVGLength(LengthModeHeight, attr->value()));
+    else
+        SVGGradientElement::parseMappedAttribute(attr);
+}
+
+void SVGLinearGradientElement::svgAttributeChanged(const QualifiedName& attrName)
+{
+    SVGGradientElement::svgAttributeChanged(attrName);
+
+    if (attrName == SVGNames::x1Attr
+        || attrName == SVGNames::y1Attr
+        || attrName == SVGNames::x2Attr
+        || attrName == SVGNames::y2Attr) {
+        updateRelativeLengthsInformation();
+        invalidateResourceClients();
+    }
+}
+
+void SVGLinearGradientElement::synchronizeProperty(const QualifiedName& attrName)
+{
+    SVGGradientElement::synchronizeProperty(attrName);
+
+    if (attrName == anyQName()) {
+        synchronizeX1();
+        synchronizeY1();
+        synchronizeX2();
+        synchronizeY2();
+        return;
+    }
+
+    if (attrName == SVGNames::x1Attr)
+        synchronizeX1();
+    else if (attrName == SVGNames::y1Attr)
+        synchronizeY1();
+    else if (attrName == SVGNames::x2Attr)
+        synchronizeX2();
+    else if (attrName == SVGNames::y2Attr)
+        synchronizeY2();
+}
+
+RenderObject* SVGLinearGradientElement::createRenderer(RenderArena* arena, RenderStyle*)
+{
+    return new (arena) RenderSVGResourceLinearGradient(this);
+}
+
+LinearGradientAttributes SVGLinearGradientElement::collectGradientProperties()
+{
+    LinearGradientAttributes attributes;
+    HashSet<SVGGradientElement*> processedGradients;
+
+    bool isLinear = true;
+    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<Gradient::ColorStop>& stops(current->buildStops());
+            if (!stops.isEmpty())
+                attributes.setStops(stops);
+        }
+
+        if (isLinear) {
+            SVGLinearGradientElement* linear = static_cast<SVGLinearGradientElement*>(current);
+
+            if (!attributes.hasX1() && current->hasAttribute(SVGNames::x1Attr))
+                attributes.setX1(linear->x1());
+
+            if (!attributes.hasY1() && current->hasAttribute(SVGNames::y1Attr))
+                attributes.setY1(linear->y1());
+
+            if (!attributes.hasX2() && current->hasAttribute(SVGNames::x2Attr))
+                attributes.setX2(linear->x2());
+
+            if (!attributes.hasY2() && current->hasAttribute(SVGNames::y2Attr))
+                attributes.setY2(linear->y2());
+        }
+
+        processedGradients.add(current);
+
+        // Respect xlink:href, take attributes from referenced element
+        Node* refNode = ownerDocument()->getElementById(SVGURIReference::getTarget(current->href()));
+        if (refNode && (refNode->hasTagName(SVGNames::linearGradientTag) || refNode->hasTagName(SVGNames::radialGradientTag))) {
+            current = static_cast<SVGGradientElement*>(refNode);
+
+            // Cycle detection
+            if (processedGradients.contains(current))
+                return LinearGradientAttributes();
+
+            isLinear = current->hasTagName(SVGNames::linearGradientTag);
+        } else
+            current = 0;
+    }
+
+    return attributes;
+}
+
+void SVGLinearGradientElement::calculateStartEndPoints(const LinearGradientAttributes& attributes, FloatPoint& startPoint, FloatPoint& endPoint)
+{
+    // Determine gradient start/end points
+    if (attributes.boundingBoxMode()) {
+        startPoint = FloatPoint(attributes.x1().valueAsPercentage(), attributes.y1().valueAsPercentage());
+        endPoint = FloatPoint(attributes.x2().valueAsPercentage(), attributes.y2().valueAsPercentage());
+    } else {
+        startPoint = FloatPoint(attributes.x1().value(this), attributes.y1().value(this));
+        endPoint = FloatPoint(attributes.x2().value(this), attributes.y2().value(this));
+    }
+}
+
+bool SVGLinearGradientElement::selfHasRelativeLengths() const
+{
+    return x1().isRelative()
+        || y1().isRelative()
+        || x2().isRelative()
+        || y2().isRelative();
+}
+
+}
+
+#endif // ENABLE(SVG)