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/*
Copyright (C) 1999 Lars Knoll (knoll@kde.org)
Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
Copyright (C) 2011 Rik Cabanier (cabanier@adobe.com)
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/Forward.h>
#include <wtf/MathExtras.h>
#include <wtf/PassOwnArrayPtr.h>
namespace WebCore {
const int undefinedLength = -1;
const int intMaxForLength = 0x7ffffff; // max value for a 28-bit int
const int intMinForLength = (-0x7ffffff - 1); // min value for a 28-bit int
enum LengthType { Auto, Relative, Percent, Fixed, Intrinsic, MinIntrinsic };
struct Length {
WTF_MAKE_FAST_ALLOCATED;
public:
Length()
: m_intValue(0), m_quirk(false), m_type(Auto), m_isFloat(false)
{
}
Length(LengthType t)
: m_intValue(0), m_quirk(false), m_type(t), m_isFloat(false)
{
}
Length(int v, LengthType t, bool q = false)
: m_intValue(v), m_quirk(q), m_type(t), m_isFloat(false)
{
}
Length(float v, LengthType t, bool q = false)
: m_floatValue(v), m_quirk(q), m_type(t), m_isFloat(true)
{
}
Length(double v, LengthType t, bool q = false)
: m_quirk(q), m_type(t), m_isFloat(true)
{
m_floatValue = static_cast<float>(v);
}
bool operator==(const Length& o) const { return (getFloatValue() == o.getFloatValue()) && (m_type == o.m_type) && (m_quirk == o.m_quirk); }
bool operator!=(const Length& o) const { return (getFloatValue() != o.getFloatValue()) || (m_type != o.m_type) || (m_quirk != o.m_quirk); }
const Length& operator*=(float v)
{
if (m_isFloat)
m_floatValue = static_cast<float>(m_floatValue * v);
else
m_intValue = static_cast<int>(m_intValue * v);
return *this;
}
int value() const {
return getIntValue();
}
float percent() const
{
ASSERT(type() == Percent);
return getFloatValue();
}
LengthType type() const { return static_cast<LengthType>(m_type); }
bool quirk() const { return m_quirk; }
void setValue(LengthType t, int value)
{
m_type = t;
m_intValue = value;
m_isFloat = false;
}
void setValue(int value)
{
setValue(Fixed, value);
}
void setValue(LengthType t, float value)
{
m_type = t;
m_floatValue = value;
m_isFloat = true;
}
void setValue(float value)
{
*this = Length(value, Fixed);
}
// note: works only for certain types, returns undefinedLength otherwise
int calcValue(int maxValue, bool roundPercentages = false) const
{
switch (type()) {
case Fixed:
case Percent:
return calcMinValue(maxValue, roundPercentages);
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() / 100.0f));
// Don't remove the extra cast to float. It is needed for rounding on 32-bit Intel machines that use the FPU stack.
return static_cast<int>(static_cast<float>(maxValue * percent() / 100.0f));
case Auto:
default:
return 0;
}
}
float calcFloatValue(int maxValue) const
{
switch (type()) {
case Fixed:
return getFloatValue();
case Percent:
return static_cast<float>(maxValue * percent() / 100.0f);
case Auto:
return static_cast<float>(maxValue);
default:
return static_cast<float>(undefinedLength);
}
}
bool isUndefined() const { return value() == undefinedLength; }
bool isZero() const
{
return m_isFloat ? !m_floatValue : !m_intValue;
}
bool isPositive() const { return getFloatValue() > 0; }
bool isNegative() const { return getFloatValue() < 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 isIntrinsicOrAuto() const { return type() == Auto || type() == MinIntrinsic || type() == Intrinsic; }
Length blend(const Length& from, float 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) {
float fromPercent = from.isZero() ? 0 : from.percent();
float toPercent = isZero() ? 0 : percent();
return Length(fromPercent + (toPercent - fromPercent) * progress, Percent);
}
float fromValue = from.isZero() ? 0 : from.value();
float toValue = isZero() ? 0 : value();
return Length(fromValue + (toValue - fromValue) * progress, resultType);
}
private:
int getIntValue() const
{
return m_isFloat ? static_cast<int>(m_floatValue) : m_intValue;
}
float getFloatValue() const
{
return m_isFloat ? m_floatValue : m_intValue;
}
union {
int m_intValue;
float m_floatValue;
};
bool m_quirk;
unsigned char m_type;
bool m_isFloat;
};
PassOwnArrayPtr<Length> newCoordsArray(const String&, int& len);
PassOwnArrayPtr<Length> newLengthArray(const String&, int& len);
} // namespace WebCore
#endif // Length_h
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