--- /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