diff -r 000000000000 -r 4f2f89ce4247 WebCore/platform/Length.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/platform/Length.h	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,198 @@
+/*
+    Copyright (C) 1999 Lars Knoll (knoll@kde.org)
+    Copyright (C) 2006, 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.
+
+    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 Length_h
+#define Length_h
+
+#include <wtf/Assertions.h>
+#include <wtf/FastAllocBase.h>
+#include <wtf/MathExtras.h>
+
+namespace WebCore {
+
+class String;
+
+const int undefinedLength = -1;
+const int percentScaleFactor = 128;
+
+enum LengthType { Auto, Relative, Percent, Fixed, Static, Intrinsic, MinIntrinsic };
+
+struct Length : FastAllocBase {
+    Length()
+        : m_value(0)
+    {
+    }
+
+    Length(LengthType t)
+        : m_value(t)
+    {
+    }
+
+    Length(int v, LengthType t, bool q = false)
+        : m_value((v * 16) | (q << 3) | t) // FIXME: Doesn't work if the passed-in value is very large!
+    {
+        ASSERT(t != Percent);
+    }
+
+    Length(double v, LengthType t, bool q = false)
+        : m_value(static_cast<int>(v * percentScaleFactor) * 16 | (q << 3) | t)
+    {
+        ASSERT(t == Percent);
+    }
+
+    bool operator==(const Length& o) const { return m_value == o.m_value; }
+    bool operator!=(const Length& o) const { return m_value != o.m_value; }
+
+    int value() const {
+        ASSERT(type() != Percent);
+        return rawValue();
+    }
+
+    int rawValue() const { return (m_value & ~0xF) / 16; }
+
+    double percent() const
+    {
+        ASSERT(type() == Percent);
+        return static_cast<double>(rawValue()) / percentScaleFactor;
+    }
+
+    LengthType type() const { return static_cast<LengthType>(m_value & 7); }
+    bool quirk() const { return (m_value >> 3) & 1; }
+
+    void setValue(LengthType t, int value)
+    {
+        ASSERT(t != Percent);
+        setRawValue(t, value);
+    }
+
+    void setRawValue(LengthType t, int value) { m_value = value * 16 | (m_value & 0x8) | t; }
+
+    void setValue(int value)
+    {
+        ASSERT(!value || type() != Percent);
+        setRawValue(value);
+    }
+
+    void setRawValue(int value) { m_value = value * 16 | (m_value & 0xF); }
+
+    void setValue(LengthType t, double value)
+    {
+        ASSERT(t == Percent);
+        m_value = static_cast<int>(value * percentScaleFactor) * 16 | (m_value & 0x8) | t;
+    }
+
+    void setValue(double value)
+    {
+        ASSERT(type() == Percent);
+        m_value = static_cast<int>(value * percentScaleFactor) * 16 | (m_value & 0xF);
+    }
+
+    // note: works only for certain types, returns undefinedLength otherwise
+    int calcValue(int maxValue, bool roundPercentages = false) const
+    {
+        switch (type()) {
+            case Fixed:
+                return value();
+            case Percent:
+                if (roundPercentages)
+                    return static_cast<int>(round(maxValue * percent() / 100.0));
+                return maxValue * rawValue() / (100 * percentScaleFactor);
+            case Auto:
+                return maxValue;
+            default:
+                return undefinedLength;
+        }
+    }
+
+    int calcMinValue(int maxValue, bool roundPercentages = false) const
+    {
+        switch (type()) {
+            case Fixed:
+                return value();
+            case Percent:
+                if (roundPercentages)
+                    return static_cast<int>(round(maxValue * percent() / 100.0));
+                return maxValue * rawValue() / (100 * percentScaleFactor);
+            case Auto:
+            default:
+                return 0;
+        }
+    }
+
+    float calcFloatValue(int maxValue) const
+    {
+        switch (type()) {
+            case Fixed:
+                return static_cast<float>(value());
+            case Percent:
+                return static_cast<float>(maxValue * percent() / 100.0);
+            case Auto:
+                return static_cast<float>(maxValue);
+            default:
+                return static_cast<float>(undefinedLength);
+        }
+    }
+
+    bool isUndefined() const { return rawValue() == undefinedLength; }
+    bool isZero() const { return !(m_value & ~0xF); }
+    bool isPositive() const { return rawValue() > 0; }
+    bool isNegative() const { return rawValue() < 0; }
+
+    bool isAuto() const { return type() == Auto; }
+    bool isRelative() const { return type() == Relative; }
+    bool isPercent() const { return type() == Percent; }
+    bool isFixed() const { return type() == Fixed; }
+    bool isStatic() const { return type() == Static; }
+    bool isIntrinsicOrAuto() const { return type() == Auto || type() == MinIntrinsic || type() == Intrinsic; }
+
+    Length blend(const Length& from, double progress) const
+    {
+        // Blend two lengths to produce a new length that is in between them.  Used for animation.
+        if (!from.isZero() && !isZero() && from.type() != type())
+            return *this;
+
+        if (from.isZero() && isZero())
+            return *this;
+        
+        LengthType resultType = type();
+        if (isZero())
+            resultType = from.type();
+        
+        if (resultType == Percent) {
+            double fromPercent = from.isZero() ? 0. : from.percent();
+            double toPercent = isZero() ? 0. : percent();
+            return Length(fromPercent + (toPercent - fromPercent) * progress, Percent);
+        } 
+            
+        int fromValue = from.isZero() ? 0 : from.value();
+        int toValue = isZero() ? 0 : value();
+        return Length(int(fromValue + (toValue - fromValue) * progress), resultType);
+    }
+
+private:
+    int m_value;
+};
+
+Length* newCoordsArray(const String&, int& len);
+Length* newLengthArray(const String&, int& len);
+
+} // namespace WebCore
+
+#endif // Length_h