Inline SVGTextLayoutAttributes::emptyValue

Source/core/layout/svg/SVGTextLayoutAttributes.h

 /*
  * Copyright (C) Research In Motion Limited 2010-2011. 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.
  */
 
 #ifndef SVGTextLayoutAttributes_h
 #define SVGTextLayoutAttributes_h
 
 #include "core/layout/svg/SVGTextMetrics.h"
 #include "wtf/HashMap.h"
+#include "wtf/MathExtras.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class LayoutSVGInlineText;
 
 struct SVGCharacterData {
     SVGCharacterData();
 
     float x;
     float y;
     float dx;
     float dy;
     float rotate;
 };
 
 typedef HashMap<unsigned, SVGCharacterData> SVGCharacterDataMap;
 
 class SVGTextLayoutAttributes {
     WTF_MAKE_NONCOPYABLE(SVGTextLayoutAttributes);
 public:
     SVGTextLayoutAttributes(LayoutSVGInlineText*);
 
     void clear();
-    static float emptyValue();
+    static float emptyValue() { return std::numeric_limits<float>::quiet_NaN(); }
+    static bool isEmptyValue(float value) { return std::isnan(value); }
 
     LayoutSVGInlineText* context() const { return m_context; }
 
     SVGCharacterDataMap& characterDataMap() { return m_characterDataMap; }
     const SVGCharacterDataMap& characterDataMap() const { return m_characterDataMap; }
 
     Vector<SVGTextMetrics>& textMetricsValues() { return m_textMetricsValues; }
     const Vector<SVGTextMetrics>& textMetricsValues() const { return m_textMetricsValues; }
 
 private:
     LayoutSVGInlineText* m_context;
     SVGCharacterDataMap m_characterDataMap;
     Vector<SVGTextMetrics> m_textMetricsValues;
 };
 
 inline SVGCharacterData::SVGCharacterData()
     : x(SVGTextLayoutAttributes::emptyValue())
     , y(SVGTextLayoutAttributes::emptyValue())
     , dx(SVGTextLayoutAttributes::emptyValue())
     , dy(SVGTextLayoutAttributes::emptyValue())
     , rotate(SVGTextLayoutAttributes::emptyValue())
 {
 }
 
 } // namespace blink
 
 #endif