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diff --git a/Source/WebCore/css/CSSPrimitiveValue.h b/Source/WebCore/css/CSSPrimitiveValue.h
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+/*
+ * (C) 1999-2003 Lars Knoll (knoll@kde.org)
+ * Copyright (C) 2004, 2005, 2006, 2008 Apple Inc. All rights reserved.
+ * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.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
+ * 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 CSSPrimitiveValue_h
+#define CSSPrimitiveValue_h
+
+#include "CSSValue.h"
+#include "Color.h"
+#include <wtf/Forward.h>
+#include <wtf/PassRefPtr.h>
+
+namespace WebCore {
+
+class Counter;
+class DashboardRegion;
+class Pair;
+class RGBColor;
+class Rect;
+class RenderStyle;
+
+struct Length;
+
+template<typename T, T max, T min> inline T roundForImpreciseConversion(double value)
+{
+    // Dimension calculations are imprecise, often resulting in values of e.g.
+    // 44.99998.  We need to go ahead and round if we're really close to the
+    // next integer value.
+    value += (value < 0) ? -0.01 : +0.01;
+    return ((value > max) || (value < min)) ? 0 : static_cast<T>(value);
+}
+
+class CSSPrimitiveValue : public CSSValue {
+public:
+    enum UnitTypes {
+        CSS_UNKNOWN = 0,
+        CSS_NUMBER = 1,
+        CSS_PERCENTAGE = 2,
+        CSS_EMS = 3,
+        CSS_EXS = 4,
+        CSS_PX = 5,
+        CSS_CM = 6,
+        CSS_MM = 7,
+        CSS_IN = 8,
+        CSS_PT = 9,
+        CSS_PC = 10,
+        CSS_DEG = 11,
+        CSS_RAD = 12,
+        CSS_GRAD = 13,
+        CSS_MS = 14,
+        CSS_S = 15,
+        CSS_HZ = 16,
+        CSS_KHZ = 17,
+        CSS_DIMENSION = 18,
+        CSS_STRING = 19,
+        CSS_URI = 20,
+        CSS_IDENT = 21,
+        CSS_ATTR = 22,
+        CSS_COUNTER = 23,
+        CSS_RECT = 24,
+        CSS_RGBCOLOR = 25,
+        CSS_PAIR = 100, // We envision this being exposed as a means of getting computed style values for pairs (border-spacing/radius, background-position, etc.)
+        CSS_DASHBOARD_REGION = 101, // FIXME: Dashboard region should not be a primitive value.
+        CSS_UNICODE_RANGE = 102,
+        
+        // These next types are just used internally to allow us to translate back and forth from CSSPrimitiveValues to CSSParserValues.
+        CSS_PARSER_OPERATOR = 103,
+        CSS_PARSER_INTEGER = 104,
+        CSS_PARSER_HEXCOLOR = 105,
+        
+        // This is used internally for unknown identifiers 
+        CSS_PARSER_IDENTIFIER = 106,
+        
+        // These are from CSS3 Values and Units, but that isn't a finished standard yet
+        CSS_TURN = 107,
+        CSS_REMS = 108
+    };
+    
+    // This enum follows the CSSParser::Units enum augmented with UNIT_FREQUENCY for frequencies.
+    enum UnitCategory {
+        UNumber,
+        UPercent,
+        ULength,
+        UAngle,
+        UTime,
+        UFrequency,
+        UOther
+    };
+
+    static bool isUnitTypeLength(int type) { return (type > CSSPrimitiveValue::CSS_PERCENTAGE && type < CSSPrimitiveValue::CSS_DEG) ||
+                                                    type == CSSPrimitiveValue::CSS_REMS; }
+
+    static PassRefPtr<CSSPrimitiveValue> createIdentifier(int ident);
+    static PassRefPtr<CSSPrimitiveValue> createColor(unsigned rgbValue);
+    static PassRefPtr<CSSPrimitiveValue> create(double value, UnitTypes type);
+    static PassRefPtr<CSSPrimitiveValue> create(const String& value, UnitTypes type);
+    
+    template<typename T> static PassRefPtr<CSSPrimitiveValue> create(T value)
+    {
+        return adoptRef(new CSSPrimitiveValue(value));
+    }
+
+    virtual ~CSSPrimitiveValue();
+
+    void cleanup();
+
+    unsigned short primitiveType() const { return m_type; }
+
+    /*
+     * computes a length in pixels out of the given CSSValue. Need the RenderStyle to get
+     * the fontinfo in case val is defined in em or ex.
+     *
+     * The metrics have to be a bit different for screen and printer output.
+     * For screen output we assume 1 inch == 72 px, for printer we assume 300 dpi
+     *
+     * this is screen/printer dependent, so we probably need a config option for this,
+     * and some tool to calibrate.
+     */
+    int computeLengthInt(RenderStyle* currStyle, RenderStyle* rootStyle);
+    int computeLengthInt(RenderStyle* currStyle, RenderStyle* rootStyle, double multiplier);
+    int computeLengthIntForLength(RenderStyle* currStyle, RenderStyle* rootStyle);
+    int computeLengthIntForLength(RenderStyle* currStyle, RenderStyle* rootStyle, double multiplier);
+    short computeLengthShort(RenderStyle* currStyle, RenderStyle* rootStyle);
+    short computeLengthShort(RenderStyle* currStyle, RenderStyle* rootStyle, double multiplier);
+    float computeLengthFloat(RenderStyle* currStyle, RenderStyle* rootStyle, bool computingFontSize = false);
+    float computeLengthFloat(RenderStyle* currStyle, RenderStyle* rootStyle, double multiplier, bool computingFontSize = false);
+    double computeLengthDouble(RenderStyle* currentStyle, RenderStyle* rootStyle, double multiplier = 1.0, bool computingFontSize = false);
+
+    // use with care!!!
+    void setPrimitiveType(unsigned short type) { m_type = type; }
+    
+    double getDoubleValue(unsigned short unitType, ExceptionCode&) const;
+    double getDoubleValue(unsigned short unitType) const;
+    double getDoubleValue() const { return m_value.num; }
+
+    void setFloatValue(unsigned short unitType, double floatValue, ExceptionCode&);
+    float getFloatValue(unsigned short unitType, ExceptionCode& ec) const { return static_cast<float>(getDoubleValue(unitType, ec)); }
+    float getFloatValue(unsigned short unitType) const { return static_cast<float>(getDoubleValue(unitType)); }
+    float getFloatValue() const { return static_cast<float>(m_value.num); }
+
+    int getIntValue(unsigned short unitType, ExceptionCode& ec) const { return static_cast<int>(getDoubleValue(unitType, ec)); }
+    int getIntValue(unsigned short unitType) const { return static_cast<int>(getDoubleValue(unitType)); }
+    int getIntValue() const { return static_cast<int>(m_value.num); }
+
+    void setStringValue(unsigned short stringType, const String& stringValue, ExceptionCode&);
+    String getStringValue(ExceptionCode&) const;
+    String getStringValue() const;
+
+    Counter* getCounterValue(ExceptionCode&) const;
+    Counter* getCounterValue() const { return m_type != CSS_COUNTER ? 0 : m_value.counter; }
+
+    Rect* getRectValue(ExceptionCode&) const;
+    Rect* getRectValue() const { return m_type != CSS_RECT ? 0 : m_value.rect; }
+
+    PassRefPtr<RGBColor> getRGBColorValue(ExceptionCode&) const;
+    RGBA32 getRGBA32Value() const { return m_type != CSS_RGBCOLOR ? 0 : m_value.rgbcolor; }
+
+    Pair* getPairValue(ExceptionCode&) const;
+    Pair* getPairValue() const { return m_type != CSS_PAIR ? 0 : m_value.pair; }
+
+    DashboardRegion* getDashboardRegionValue() const { return m_type != CSS_DASHBOARD_REGION ? 0 : m_value.region; }
+
+    int getIdent() const;
+    template<typename T> inline operator T() const; // Defined in CSSPrimitiveValueMappings.h
+
+    virtual bool parseString(const String&, bool = false);
+    virtual String cssText() const;
+
+    virtual bool isQuirkValue() { return false; }
+
+    virtual CSSParserValue parserValue() const;
+
+    virtual void addSubresourceStyleURLs(ListHashSet<KURL>&, const CSSStyleSheet*);
+
+protected:
+    // FIXME: int vs. unsigned overloading is too subtle to distinguish the color and identifier cases.
+    CSSPrimitiveValue(int ident);
+    CSSPrimitiveValue(double, UnitTypes);
+    CSSPrimitiveValue(const String&, UnitTypes);
+
+private:
+    CSSPrimitiveValue();
+    CSSPrimitiveValue(unsigned color); // RGB value
+    CSSPrimitiveValue(const Length&);
+
+    template<typename T> CSSPrimitiveValue(T); // Defined in CSSPrimitiveValueMappings.h
+    template<typename T> CSSPrimitiveValue(T* val) { init(PassRefPtr<T>(val)); }
+    template<typename T> CSSPrimitiveValue(PassRefPtr<T> val) { init(val); }
+
+    static void create(int); // compile-time guard
+    static void create(unsigned); // compile-time guard
+    template<typename T> operator T*(); // compile-time guard
+
+    static PassRefPtr<CSSPrimitiveValue> createUncachedIdentifier(int identifier);
+    static PassRefPtr<CSSPrimitiveValue> createUncachedColor(unsigned rgbValue);
+    static PassRefPtr<CSSPrimitiveValue> createUncached(double value, UnitTypes type);
+
+    static UnitTypes canonicalUnitTypeForCategory(UnitCategory category);
+
+    void init(PassRefPtr<Counter>);
+    void init(PassRefPtr<Rect>);
+    void init(PassRefPtr<Pair>);
+    void init(PassRefPtr<DashboardRegion>); // FIXME: Dashboard region should not be a primitive value.
+    bool getDoubleValueInternal(UnitTypes targetUnitType, double* result) const;
+
+    virtual bool isPrimitiveValue() const { return true; }
+
+    virtual unsigned short cssValueType() const;
+
+    int m_type : 31;
+    mutable unsigned m_hasCachedCSSText : 1;
+    union {
+        int ident;
+        double num;
+        StringImpl* string;
+        Counter* counter;
+        Rect* rect;
+        unsigned rgbcolor;
+        Pair* pair;
+        DashboardRegion* region;
+    } m_value;
+};
+
+} // namespace WebCore
+
+#endif // CSSPrimitiveValue_h