[svg] Make svgView override existing data selectively

Source/core/svg/SVGViewSpec.h

 /*
  * Copyright (C) 2007 Rob Buis <buis@kde.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
@@ skipping 27 matching lines @@
 #endif
 
     static PassRefPtrWillBeRawPtr<SVGViewSpec> create(SVGSVGElement* contextElement)
     {
         return adoptRefWillBeNoop(new SVGViewSpec(contextElement));
     }
 
     bool parseViewSpec(const String&);
     void reset();
     void detachContextElement();
+    template<typename T> void inheritViewAttributesFromElement(T*);
 
     // JS API
     SVGTransformList* transform() { return m_transform ? m_transform->baseValue() : 0; }
     PassRefPtrWillBeRawPtr<SVGTransformListTearOff> transformFromJavascript() { return m_transform ? m_transform->baseVal() : 0; }
     SVGElement* viewTarget() const;
     String viewBoxString() const;
     String preserveAspectRatioString() const;
     String transformString() const;
     String viewTargetString() const { return m_viewTargetString; }
     // override SVGZoomAndPan.setZoomAndPan so can throw exception on write
     void setZoomAndPan(unsigned short value) { } // read only
     void setZoomAndPan(unsigned short value, ExceptionState&);
 
     DECLARE_VIRTUAL_TRACE();
 
     SVGSVGElement* contextElement() { return m_contextElement.get(); }
 
 private:
     explicit SVGViewSpec(SVGSVGElement*);
 
     template<typename CharType>
     bool parseViewSpecInternal(const CharType* ptr, const CharType* end);
 
     RawPtrWillBeMember<SVGSVGElement> m_contextElement;
     RefPtrWillBeMember<SVGAnimatedTransformList> m_transform;
     String m_viewTargetString;
 };
 
+template <typename T>
+void SVGViewSpec::inheritViewAttributesFromElement(T* inheritFromElement)
+{
+    if (inheritFromElement->hasAttribute(SVGNames::viewBoxAttr))
+        viewBox()->baseValue()->setValue(inheritFromElement->viewBox()->currentValue()->value());
+
+    if (inheritFromElement->hasAttribute(SVGNames::preserveAspectRatioAttr)) {
+        preserveAspectRatio()->baseValue()->setAlign(inheritFromElement->preserveAspectRatio()->currentValue()->align());
+        preserveAspectRatio()->baseValue()->setMeetOrSlice(inheritFromElement->preserveAspectRatio()->currentValue()->meetOrSlice());
+    }
+
+    if (inheritFromElement->hasAttribute(SVGNames::zoomAndPanAttr))
+        setZoomAndPan(inheritFromElement->zoomAndPan());
+}
+
 } // namespace blink
 
 #endif // SVGViewSpec_h