CSS Length calculation with MediaValues

Source/core/css/CSSPrimitiveValue.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2012 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 580 matching lines @@
 template<> double CSSPrimitiveValue::computeLength(const CSSToLengthConversionData& conversionData)
 {
     return computeLengthDouble(conversionData);
 }
 
 double CSSPrimitiveValue::computeLengthDouble(const CSSToLengthConversionData& conversionData)
 {
     if (m_primitiveUnitType == CSS_CALC)
         return m_value.calc->computeLengthPx(conversionData);
 
-    const RenderStyle& style = conversionData.style();
-    const RenderStyle* rootStyle = conversionData.rootStyle();
     bool computingFontSize = conversionData.computingFontSize();
 
     double factor;
 
     switch (primitiveType()) {
         case CSS_EMS:
-            factor = computingFontSize ? style.fontDescription().specifiedSize() : style.fontDescription().computedSize();
+            factor = computingFontSize ? conversionData.fontSpecifiedSize() : conversionData.fontComputedSize();
             break;
         case CSS_EXS:
             // FIXME: We have a bug right now where the zoom will be applied twice to EX units.
             // We really need to compute EX using fontMetrics for the original specifiedSize and not use
             // our actual constructed rendering font.
-            if (style.fontMetrics().hasXHeight())
-                factor = style.fontMetrics().xHeight();
+            if (conversionData.hasXHeight())
+                factor = conversionData.xHeight();
             else
-                factor = (computingFontSize ? style.fontDescription().specifiedSize() : style.fontDescription().computedSize()) / 2.0;
+                factor = (computingFontSize ? conversionData.fontSpecifiedSize() : conversionData.fontComputedSize()) / 2.0;
             break;
         case CSS_REMS:
-            if (rootStyle)
-                factor = computingFontSize ? rootStyle->fontDescription().specifiedSize() : rootStyle->fontDescription().computedSize();
+            if (conversionData.hasRoot())
+                factor = computingFontSize ? conversionData.rootFontSpecifiedSize() : conversionData.rootFontComputedSize();
             else
                 factor = 1.0;
             break;
         case CSS_CHS:
-            factor = style.fontMetrics().zeroWidth();
+            factor = conversionData.zeroWidth();
             break;
         case CSS_PX:
             factor = 1.0;
             break;
         case CSS_CM:
             factor = cssPixelsPerCentimeter;
             break;
         case CSS_MM:
             factor = cssPixelsPerMillimeter;
             break;
@@ skipping 679 matching lines @@
     case CSS_SHAPE:
         visitor->trace(m_value.shape);
         break;
     default:
         break;
     }
     CSSValue::traceAfterDispatch(visitor);
 }
 
 } // namespace WebCore