Introduce isSVGFontElement() and isSVGImageElement(), and use them

Source/core/svg/SVGFontFaceElement.cpp

 /*
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2008 Apple Inc. 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.
  *
@@ skipping 247 matching lines @@
 }
 
 String SVGFontFaceElement::fontFamily() const
 {
     return m_fontFaceRule->properties()->getPropertyValue(CSSPropertyFontFamily);
 }
 
 SVGFontElement* SVGFontFaceElement::associatedFontElement() const
 {
     ASSERT(parentNode() == m_fontElement);
-    ASSERT(!parentNode() || parentNode()->hasTagName(SVGNames::fontTag));
+    ASSERT(!parentNode() || isSVGFontElement(parentNode()));
     return m_fontElement;
 }
 
 void SVGFontFaceElement::rebuildFontFace()
 {
     if (!inDocument()) {
         ASSERT(!m_fontElement);
         return;
     }
 
     // we currently ignore all but the first src element, alternatively we could concat them
     SVGFontFaceSrcElement* srcElement = 0;
 
     for (Node* child = firstChild(); child && !srcElement; child = child->nextSibling()) {
         if (child->hasTagName(font_face_srcTag))
             srcElement = static_cast<SVGFontFaceSrcElement*>(child);
     }
 
-    bool describesParentFont = parentNode()->hasTagName(SVGNames::fontTag);
+    bool describesParentFont = isSVGFontElement(parentNode());
     RefPtr<CSSValueList> list;
 
     if (describesParentFont) {
         m_fontElement = toSVGFontElement(parentNode());
 
         list = CSSValueList::createCommaSeparated();
         list->append(CSSFontFaceSrcValue::createLocal(fontFamily()));
     } else {
         m_fontElement = 0;
         if (srcElement)
@@ skipping 50 matching lines @@
 
 void SVGFontFaceElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
 {
     SVGElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);
     rebuildFontFace();
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(SVG_FONTS)