impeller::Rational Class Reference

#include <rational.h>

Public Member Functions
constexpr	Rational (int32_t num)
constexpr	Rational (int32_t num, uint32_t den)
int32_t	GetNumerator () const
uint32_t	GetDenominator () const
bool	operator== (const Rational &that) const
bool	operator< (const Rational &that) const
uint64_t	GetHash () const
	operator Scalar () const
Rational	Invert () const

Detailed Description

Definition at line 13 of file rational.h.

Constructor & Destructor Documentation

Rational() [1/2]

constexpr impeller::Rational::Rational ( int32_t  num )

inlineexplicitconstexpr

Definition at line 15 of file rational.h.

: num_(num), den_(1) {}

Rational() [2/2]

constexpr impeller::Rational::Rational ( int32_t  num, uint32_t  den  )

inlineconstexpr

Definition at line 17 of file rational.h.

: num_(num), den_(den) {}

Member Function Documentation

GetDenominator()

uint32_t impeller::Rational::GetDenominator ( ) const

inline

Definition at line 21 of file rational.h.

{ return den_; }

Referenced by impeller::TextFrame::RoundScaledFontSize().

GetHash()

uint64_t impeller::Rational::GetHash

(

)

const

Definition at line 38 of file rational.cc.

                                 {
  if (num_ == 0) {
    return 0;
  }
  uint64_t gcd = std::gcd(num_, den_);
  return ((num_ / gcd) << 32) | (den_ / gcd);
}

GetNumerator()

int32_t impeller::Rational::GetNumerator ( ) const

inline

Definition at line 19 of file rational.h.

{ return num_; }

Referenced by impeller::TextFrame::RoundScaledFontSize().

Invert()

Rational impeller::Rational::Invert

(

)

const

Definition at line 46 of file rational.cc.

                                {
  if (num_ >= 0) {
    return Rational(den_, num_);
  } else {
    return Rational(-1 * static_cast<int32_t>(den_), std::abs(num_));
  }
}

Referenced by impeller::TextContents::ComputeVertexData().

operator Scalar()

impeller::Rational::operator Scalar ( ) const

inlineexplicit

Definition at line 29 of file rational.h.

{ return static_cast<float>(num_) / den_; }

operator<()

bool impeller::Rational::operator<

(

const Rational &

that

)

const

Definition at line 28 of file rational.cc.

                                                   {
  if (den_ == that.den_) {
    return num_ < that.num_;
  } else if ((num_ >= 0) != (that.num_ >= 0)) {
    return num_ < that.num_;
  } else {
    return AbsToUnsigned(num_) * that.den_ < AbsToUnsigned(that.num_) * den_;
  }
}

operator==()

bool impeller::Rational::operator==

(

const Rational &

that

)

const

Definition at line 18 of file rational.cc.

                                                    {
  if (den_ == that.den_) {
    return num_ == that.num_;
  } else if ((num_ >= 0) != (that.num_ >= 0)) {
    return false;
  } else {
    return AbsToUnsigned(num_) * that.den_ == AbsToUnsigned(that.num_) * den_;
  }
}

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The documentation for this class was generated from the following files:

• impeller/geometry/rational.h
• impeller/geometry/rational.cc