1 files changed, 124 insertions, 0 deletions
diff --git a/Source/WebCore/svg/SVGLocatable.cpp b/Source/WebCore/svg/SVGLocatable.cpp
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+++ b/Source/WebCore/svg/SVGLocatable.cpp
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+/*
+ * Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
+ * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
+ * Copyright (C) 2009 Google, Inc.  All rights reserved.
+ * 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 "SVGLocatable.h"
+
+#include "RenderObject.h"
+#include "SVGException.h"
+#include "SVGNames.h"
+#include "SVGStyledLocatableElement.h"
+
+namespace WebCore {
+
+static bool isViewportElement(Node* node)
+{
+    return (node->hasTagName(SVGNames::svgTag)
+        || node->hasTagName(SVGNames::symbolTag)
+#if ENABLE(SVG_FOREIGN_OBJECT)
+        || node->hasTagName(SVGNames::foreignObjectTag)
+#endif
+        || node->hasTagName(SVGNames::imageTag));
+}
+
+SVGElement* SVGLocatable::nearestViewportElement(const SVGElement* element)
+{
+    ASSERT(element);
+    for (ContainerNode* n = element->parentNode(); n; n = n->parentNode()) {
+        if (isViewportElement(n))
+            return static_cast<SVGElement*>(n);
+    }
+
+    return 0;
+}
+
+SVGElement* SVGLocatable::farthestViewportElement(const SVGElement* element)
+{
+    ASSERT(element);
+    SVGElement* farthest = 0;
+    for (ContainerNode* n = element->parentNode(); n; n = n->parentNode()) {
+        if (isViewportElement(n))
+            farthest = static_cast<SVGElement*>(n);
+    }
+    return farthest;
+}
+
+FloatRect SVGLocatable::getBBox(const SVGElement* element, StyleUpdateStrategy styleUpdateStrategy)
+{
+    ASSERT(element);
+    if (styleUpdateStrategy == AllowStyleUpdate)
+        element->document()->updateLayoutIgnorePendingStylesheets();
+
+    // FIXME: Eventually we should support getBBox for detached elements.
+    if (!element->renderer())
+        return FloatRect();
+
+    return element->renderer()->objectBoundingBox();
+}
+
+AffineTransform SVGLocatable::computeCTM(const SVGElement* element, CTMScope mode, StyleUpdateStrategy styleUpdateStrategy)
+{
+    ASSERT(element);
+    if (styleUpdateStrategy == AllowStyleUpdate)
+        element->document()->updateLayoutIgnorePendingStylesheets();
+
+    AffineTransform ctm;
+
+    SVGElement* stopAtElement = mode == NearestViewportScope ? nearestViewportElement(element) : 0;
+
+    Node* current = const_cast<SVGElement*>(element);
+    while (current && current->isSVGElement()) {
+        SVGElement* currentElement = static_cast<SVGElement*>(current);
+        if (currentElement->isStyled())
+            ctm = static_cast<SVGStyledElement*>(currentElement)->localCoordinateSpaceTransform(mode).multLeft(ctm);
+
+        // For getCTM() computation, stop at the nearest viewport element
+        if (currentElement == stopAtElement)
+            break;
+
+        current = current->parentOrHostNode();
+    }
+
+    return ctm;
+}
+
+AffineTransform SVGLocatable::getTransformToElement(SVGElement* target, ExceptionCode& ec, StyleUpdateStrategy styleUpdateStrategy) const
+{
+    AffineTransform ctm = getCTM(styleUpdateStrategy);
+
+    if (target && target->isStyledLocatable()) {
+        AffineTransform targetCTM = static_cast<SVGStyledLocatableElement*>(target)->getCTM(styleUpdateStrategy);
+        if (!targetCTM.isInvertible()) {
+            ec = SVGException::SVG_MATRIX_NOT_INVERTABLE;
+            return ctm;
+        }
+        ctm *= targetCTM.inverse();
+    }
+
+    return ctm;
+}
+
+}
+
+#endif // ENABLE(SVG)