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Diffstat (limited to 'src/gui/math3d/qfixedpt.cpp')
| -rw-r--r-- | src/gui/math3d/qfixedpt.cpp | 681 |
1 files changed, 681 insertions, 0 deletions
diff --git a/src/gui/math3d/qfixedpt.cpp b/src/gui/math3d/qfixedpt.cpp new file mode 100644 index 0000000..e7e61b6 --- /dev/null +++ b/src/gui/math3d/qfixedpt.cpp @@ -0,0 +1,681 @@ +/**************************************************************************** +** +** 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 |