SkMath.h File Reference

#include "include/core/SkTypes.h"

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Functions
static int64_t	sk_64_mul (int64_t a, int64_t b)
template<typename T >
constexpr bool	SkIsPow2 (T value)
	Returns true if value is a power of 2. More...
static unsigned	SkMul16ShiftRound (U16CPU a, U16CPU b, int shift)
	Return a*b/((1 << shift) - 1), rounding any fractional bits. More...
static U8CPU	SkMulDiv255Round (U16CPU a, U16CPU b)
	Return a*b/255, rounding any fractional bits. More...

Function Documentation

sk_64_mul()

static int64_t sk_64_mul ( int64_t  a, int64_t  b  )

inlinestatic

SkIsPow2()

template<typename T >

constexpr bool SkIsPow2 ( T  value )

inlineconstexpr

Returns true if value is a power of 2.

Does not explicitly check for value <= 0.

SkMul16ShiftRound()

static unsigned SkMul16ShiftRound ( U16CPU  a, U16CPU  b, int  shift  )

inlinestatic

Return a*b/((1 << shift) - 1), rounding any fractional bits.

Only valid if a and b are unsigned and <= 32767 and shift is > 0 and <= 8

SkMulDiv255Round()

static U8CPU SkMulDiv255Round ( U16CPU  a, U16CPU  b  )

inlinestatic

Return a*b/255, rounding any fractional bits.

Only valid if a and b are unsigned and <= 32767.