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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** This file is part of the $MODULE$ of the Qt Toolkit.
**
** $TROLLTECH_DUAL_LICENSE$
**
****************************************************************************/
#include "qfixedpt.h"
QT_BEGIN_NAMESPACE
/*!
\internal
Returns the fixed-point square root of \a value.
*/
qint64 qt_math3d_fixed_sqrt(qint64 value)
{
qint64 result = 0;
qint64 bit = ((qint64)1) << 62;
while (bit > value)
bit >>= 2;
while (bit != 0) {
if (value >= (result + bit)) {
value -= result + bit;
result += (bit << 1);
}
result >>= 1;
bit >>= 2;
}
return result;
}
/*!
\class QFixedPt
\brief The QFixedPt class represents fixed-point numbers within a 32-bit integer with a configurable precision.
The template parameter is the number of bits of precision after
the decimal point. For example, QFixedPt<5> indicates that there
are 27 bits before the decimal point, and 5 bits of precision after
the decimal point.
*/
/*!
\fn QFixedPt::QFixedPt()
Constructs a default fixed-point number. The initial value
is undefined.
*/
/*!
\fn QFixedPt::QFixedPt(int value)
Constructs a fixed-point number from the integer \a value.
*/
/*!
\fn QFixedPt::QFixedPt(qreal value)
Constructs a fixed-point number from the floating-point \a value.
*/
/*!
\fn QFixedPt<PrecBits>& QFixedPt::operator=(int value)
Assigns the integer \a value to this fixed-point variable.
*/
/*!
\fn QFixedPt<PrecBits>& QFixedPt::operator=(qreal value)
Assigns the floating-point \a value to this fixed-point variable.
*/
/*!
\fn int QFixedPt::bits() const
Returns the raw bits that represent the fixed-point value of this object.
\sa setBits()
*/
/*!
\fn void QFixedPt::setBits(int value)
Sets the raw bits that represent the fixed-point value of
this object to \a value.
\sa bits()
*/
#if !defined(QT_NO_MEMBER_TEMPLATES) || defined(Q_QDOC)
/*!
\fn QFixedPt<Prec> QFixedPt::toPrecision() const
Returns this fixed-point number, converted to the new fixed-point
precision Prec.
\sa qFixedPtToPrecision()
*/
#endif
/*!
\fn QFixedPt<Prec> qFixedPtToPrecision(const QFixedPt<PrecBits>& value)
Returns the fixed-point number \a value, converted to the new fixed-point
precision Prec.
\sa QFixedPt::toPrecision()
*/
/*!
\fn QFixedPt<PrecBits>& QFixedPt::operator+=(const QFixedPt<PrecBits>& value)
Adds \a value to this fixed-point number.
*/
/*!
\fn QFixedPt<PrecBits>& QFixedPt::operator+=(int value)
Adds an integer \a value to this fixed-point number.
*/
/*!
\fn QFixedPt<PrecBits>& QFixedPt::operator+=(qreal value)
Adds a floating-point \a value to this fixed-point number.
*/
/*!
\fn QFixedPt<PrecBits>& QFixedPt::operator-=(const QFixedPt<PrecBits>& value)
Subtracts \a value from this fixed-point number.
*/
/*!
\fn QFixedPt<PrecBits>& QFixedPt::operator-=(int value)
Subtracts an integer \a value from this fixed-point number.
*/
/*!
\fn QFixedPt<PrecBits>& QFixedPt::operator-=(qreal value)
Subtracts a floating-point \a value from this fixed-point number.
*/
/*!
\fn QFixedPt<PrecBits>& QFixedPt::operator*=(const QFixedPt<PrecBits>& value)
Multiplies this fixed-point number by \a value.
*/
/*!
\fn QFixedPt<PrecBits>& QFixedPt::operator*=(int value)
Multiplies this fixed-point number by an integer \a value.
*/
/*!
\fn QFixedPt<PrecBits>& QFixedPt::operator*=(qreal value)
Multiplies this fixed-point number by a floating-point \a value.
*/
/*!
\fn QFixedPt<PrecBits>& QFixedPt::operator/=(const QFixedPt<PrecBits>& value)
Divides this fixed-point number by \a value. Division by zero
will result in zero.
*/
/*!
\fn QFixedPt<PrecBits>& QFixedPt::operator/=(int value)
Divides this fixed-point number by an integer \a value. Division
by zero will result in zero.
*/
/*!
\fn QFixedPt<PrecBits>& QFixedPt::operator/=(qreal value)
Divides this fixed-point number by a floating-point \a value. Division
by zero will result in zero.
*/
/*!
\fn QFixedPt<PrecBits>& QFixedPt::operator<<=(int value)
Shifts this fixed-point number left by \a value bits.
*/
/*!
\fn QFixedPt<PrecBits>& QFixedPt::operator>>=(int value)
Shifts this fixed-point number right by \a value bits.
*/
/*!
\fn QFixedPt<PrecBits> QFixedPt::operator<<(int value) const
Returns the result of shifting this fixed-point number
left by \a value bits.
*/
/*!
\fn QFixedPt<PrecBits> QFixedPt::operator>>(int value) const
Returns the result of shifting this fixed-point number
right by \a value bits.
*/
/*!
\fn bool QFixedPt::operator==(const QFixedPt<PrecBits>& value) const
Returns true if this fixed-point number is equal to \a value;
false otherwise.
*/
/*!
\fn bool operator==(const QFixedPt<PrecBits>& v1, int v2)
\relates QFixedPt
Returns true if \a v1 is equal to \a v2; false otherwise.
*/
/*!
\fn bool operator==(int v1, const QFixedPt<PrecBits>& v2)
\relates QFixedPt
Returns true if \a v1 is equal to \a v2; false otherwise.
*/
/*!
\fn bool operator==(const QFixedPt<PrecBits>& v1, qreal v2)
\relates QFixedPt
Returns true if \a v1 is equal to \a v2; false otherwise.
*/
/*!
\fn bool operator==(qreal v1, const QFixedPt<PrecBits>& v2)
\relates QFixedPt
Returns true if \a v1 is equal to \a v2; false otherwise.
*/
/*!
\fn bool QFixedPt::operator!=(const QFixedPt<PrecBits>& value) const
Returns true if this fixed-point number is not equal to \a value;
false otherwise.
*/
/*!
\fn bool operator!=(const QFixedPt<PrecBits>& v1, int v2)
\relates QFixedPt
Returns true if \a v1 is not equal to \a v2; false otherwise.
*/
/*!
\fn bool operator!=(int v1, const QFixedPt<PrecBits>& v2)
\relates QFixedPt
Returns true if \a v1 is not equal to \a v2; false otherwise.
*/
/*!
\fn bool operator!=(const QFixedPt<PrecBits>& v1, qreal v2)
\relates QFixedPt
Returns true if \a v1 is not equal to \a v2; false otherwise.
*/
/*!
\fn bool operator!=(qreal v1, const QFixedPt<PrecBits>& v2)
\relates QFixedPt
Returns true if \a v1 is not equal to \a v2; false otherwise.
*/
/*!
\fn bool QFixedPt::operator<=(const QFixedPt<PrecBits>& value) const
Returns true if this fixed-point number is less than or equal to
\a value; false otherwise.
*/
/*!
\fn bool operator<=(const QFixedPt<PrecBits>& v1, int v2)
\relates QFixedPt
Returns true if \a v1 is less than or equal to \a v2; false otherwise.
*/
/*!
\fn bool operator<=(int v1, const QFixedPt<PrecBits>& v2)
\relates QFixedPt
Returns true if \a v1 is less than or equal to \a v2; false otherwise.
*/
/*!
\fn bool operator<=(const QFixedPt<PrecBits>& v1, qreal v2)
\relates QFixedPt
Returns true if \a v1 is less than or equal to \a v2; false otherwise.
*/
/*!
\fn bool operator<=(qreal v1, const QFixedPt<PrecBits>& v2)
\relates QFixedPt
Returns true if \a v1 is less than or equal to \a v2; false otherwise.
*/
/*!
\fn bool QFixedPt::operator<(const QFixedPt<PrecBits>& value) const
Returns true if this fixed-point number is less than \a value;
false otherwise.
*/
/*!
\fn bool operator<(const QFixedPt<PrecBits>& v1, int v2)
\relates QFixedPt
Returns true if \a v1 is less than \a v2; false otherwise.
*/
/*!
\fn bool operator<(int v1, const QFixedPt<PrecBits>& v2)
\relates QFixedPt
Returns true if \a v1 is less than \a v2; false otherwise.
*/
/*!
\fn bool operator<(const QFixedPt<PrecBits>& v1, qreal v2)
\relates QFixedPt
Returns true if \a v1 is less than \a v2; false otherwise.
*/
/*!
\fn bool operator<(qreal v1, const QFixedPt<PrecBits>& v2)
\relates QFixedPt
Returns true if \a v1 is less than \a v2; false otherwise.
*/
/*!
\fn bool QFixedPt::operator>=(const QFixedPt<PrecBits>& value) const
Returns true if this fixed-point number is greater than or equal to
\a value; false otherwise.
*/
/*!
\fn bool operator>=(const QFixedPt<PrecBits>& v1, int v2)
\relates QFixedPt
Returns true if \a v1 is greater than or equal to \a v2; false otherwise.
*/
/*!
\fn bool operator>=(int v1, const QFixedPt<PrecBits>& v2)
\relates QFixedPt
Returns true if \a v1 is greater than or equal to \a v2; false otherwise.
*/
/*!
\fn bool operator>=(const QFixedPt<PrecBits>& v1, qreal v2)
\relates QFixedPt
Returns true if \a v1 is greater than or equal to \a v2; false otherwise.
*/
/*!
\fn bool operator>=(qreal v1, const QFixedPt<PrecBits>& v2)
\relates QFixedPt
Returns true if \a v1 is greater than or equal to \a v2; false otherwise.
*/
/*!
\fn bool QFixedPt::operator>(const QFixedPt<PrecBits>& value) const
Returns true if this fixed-point number is greater than \a value;
false otherwise.
*/
/*!
\fn bool operator>(const QFixedPt<PrecBits>& v1, int v2)
\relates QFixedPt
Returns true if \a v1 is greater than \a v2; false otherwise.
*/
/*!
\fn bool operator>(int v1, const QFixedPt<PrecBits>& v2)
\relates QFixedPt
Returns true if \a v1 is greater than \a v2; false otherwise.
*/
/*!
\fn bool operator>(const QFixedPt<PrecBits>& v1, qreal v2)
\relates QFixedPt
Returns true if \a v1 is greater than \a v2; false otherwise.
*/
/*!
\fn bool operator>(qreal v1, const QFixedPt<PrecBits>& v2)
\relates QFixedPt
Returns true if \a v1 is greater than \a v2; false otherwise.
*/
/*!
\fn QFixedPt<PrecBits> QFixedPt::operator+(const QFixedPt<PrecBits>& value) const
Returns the result of adding this fixed-point number and \a value.
*/
/*!
\fn QFixedPt<PrecBits> QFixedPt::operator+(int value) const
Returns the result of adding this fixed-point number and \a value.
*/
/*!
\fn QFixedPt<PrecBits> QFixedPt::operator+(qreal value) const
Returns the result of adding this fixed-point number and \a value.
*/
/*!
\fn QFixedPt<PrecBits> operator+(int v1, const QFixedPt<PrecBits>& v2)
\relates QFixedPt
Returns the result of adding \a v1 and \a v2.
*/
/*!
\fn QFixedPt<PrecBits> operator+(qreal v1, const QFixedPt<PrecBits>& v2)
\relates QFixedPt
Returns the result of adding \a v1 and \a v2.
*/
/*!
\fn QFixedPt<PrecBits> QFixedPt::operator-(const QFixedPt<PrecBits>& value) const
Returns the result of subtracting \a value from this fixed-point number.
*/
/*!
\fn QFixedPt<PrecBits> QFixedPt::operator-(int value) const
Returns the result of subtracting \a value from this fixed-point number.
*/
/*!
\fn QFixedPt<PrecBits> QFixedPt::operator-(qreal value) const
Returns the result of subtracting \a value from this fixed-point number.
*/
/*!
\fn QFixedPt<PrecBits> operator-(int v1, const QFixedPt<PrecBits>& v2)
\relates QFixedPt
Returns the result of subtracting \a v2 from \a v1.
*/
/*!
\fn QFixedPt<PrecBits> operator-(qreal v1, const QFixedPt<PrecBits>& v2)
\relates QFixedPt
Returns the result of subtracting \a v2 from \a v1.
*/
/*!
\fn QFixedPt<PrecBits> QFixedPt::operator*(const QFixedPt<PrecBits>& value) const
Returns the result of multiplying this fixed-point number by \a value.
*/
/*!
\fn QFixedPt<PrecBits> QFixedPt::operator*(int value) const
Returns the result of multiplying this fixed-point number by \a value.
*/
/*!
\fn QFixedPt<PrecBits> QFixedPt::operator*(qreal value) const
Returns the result of multiplying this fixed-point number by \a value.
*/
/*!
\fn QFixedPt<PrecBits> operator*(int v1, const QFixedPt<PrecBits>& v2)
\relates QFixedPt
Returns the result of multiplying \a v1 by \a v2.
*/
/*!
\fn QFixedPt<PrecBits> operator*(qreal v1, const QFixedPt<PrecBits>& v2)
\relates QFixedPt
Returns the result of multiplying \a v1 by \a v2.
*/
/*!
\fn QFixedPt<PrecBits> QFixedPt::operator/(const QFixedPt<PrecBits>& value) const
Returns the result of dividing this fixed-point number by \a value.
Division by zero will result in zero.
*/
/*!
\fn QFixedPt<PrecBits> QFixedPt::operator/(int value) const
Returns the result of dividing this fixed-point number by \a value.
Division by zero will result in zero.
*/
/*!
\fn QFixedPt<PrecBits> QFixedPt::operator/(qreal value) const
Returns the result of dividing this fixed-point number by \a value.
Division by zero will result in zero.
*/
/*!
\fn QFixedPt<PrecBits> operator/(int v1, const QFixedPt<PrecBits>& v2)
\relates QFixedPt
Returns the result of dividing \a v1 by \a v2. Division by zero will
result in zero.
*/
/*!
\fn QFixedPt<PrecBits> operator/(qreal v1, const QFixedPt<PrecBits>& v2)
\relates QFixedPt
Returns the result of dividing \a v1 by \a v2. Division by zero will
result in zero.
*/
/*!
\fn QFixedPt<PrecBits> QFixedPt::operator-() const
Returns the negation of this fixed-point number.
*/
/*!
\fn QFixedPt<PrecBits> QFixedPt::sqrt() const
Returns the square root of this fixed-point number.
\sa sqrtF()
*/
/*!
\fn qreal QFixedPt::sqrtF() const
Return the square root of this fixed-point number as a
floating-point value.
\sa sqrt()
*/
/*!
\fn QFixedPt<PrecBits> QFixedPt::round() const
Returns this fixed-point number, rounded to the nearest integer.
\sa floor(), ceil(), truncate()
*/
/*!
\fn QFixedPt<PrecBits> QFixedPt::floor() const;
Returns the largest integer that is less than or equal to
this fixed-point number.
\sa round(), ceil(), truncate()
*/
/*!
\fn QFixedPt<PrecBits> QFixedPt::ceil() const
Returns the smallest integer that is greater than or equal to
this fixed-point number.
\sa round(), floor(), truncate()
*/
/*!
\fn int QFixedPt::truncate() const
Returns this fixed-point number with the bits after the
decimal point truncated.
\sa round(), floor(), ceil()
*/
/*!
\fn int QFixedPt::toInt() const
Returns this fixed-point number, rounded to the nearest integer.
\sa toReal()
*/
/*!
\fn qreal QFixedPt::toReal() const
Returns this fixed-point number as a floating-point value.
\sa toInt()
*/
/*!
\fn int qCeil(const QFixedPt<PrecBits>& value)
\relates QFixedPt
Returns the smallest integer that is greater than or equal to
\a value.
\sa qFloor(), qRound(), QFixedPt::ceil()
*/
/*!
\fn int qFloor(const QFixedPt<PrecBits>& value)
\relates QFixedPt
Returns the largest integer that is less than or equal to
\a value.
\sa qCeil(), qRound(), QFixedPt::floor()
*/
/*!
\fn int qRound(const QFixedPt<PrecBits>& value)
\relates QFixedPt
Returns \a value, rounded to the nearest integer.
\sa qCeil(), qFloor(), QFixedPt::round()
*/
/*!
\fn bool qFuzzyCompare(const QFixedPt<PrecBits>& v1, const QFixedPt<PrecBits>& v2, int compareBits)
\relates QFixedPt
Returns true if \a v1 is almost equal to \a v2; false otherwise.
The \a compareBits parameter specifies the number of bits of precision
that should be considered relevant when performing the comparison.
By default, \a compareBits is PrecBits / 4.
*/
/*!
\fn bool qIsNull(const QFixedPt<PrecBits>& v)
\relates QFixedPt
Returns true if \a v is zero; false otherwise.
*/
QT_END_NAMESPACE
|
