#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.

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

Referenced by Invert().

◆ Rational() [2/2]

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

inlineconstexpr

Definition at line 17 of file rational.h.

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

Member Function Documentation

◆ GetDenominator()

uint32_t impeller::Rational::GetDenominator ( ) const

inline

Definition at line 21 of file rational.h.

21 { 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);
 }

Referenced by impeller::TextShadowCache::TextShadowCacheKey::Hash::operator()().

◆ GetNumerator()

int32_t impeller::Rational::GetNumerator ( ) const

inline

Definition at line 19 of file rational.h.

19 { 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_));
   }
 }

References Rational().

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

◆ operator Scalar()

impeller::Rational::operator Scalar ( ) const

inlineexplicit

Definition at line 29 of file rational.h.

29 { 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_;
   }
 }

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

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

Public Member Functions