SkSafe32.h File Reference

#include "include/private/base/SkAssert.h"
#include "include/private/base/SkMath.h"
#include <cstdint>

Go to the source code of this file.

Functions
static constexpr int32_t	Sk64_pin_to_s32 (int64_t x)
static constexpr int32_t	Sk32_sat_add (int32_t a, int32_t b)
static constexpr int32_t	Sk32_sat_sub (int32_t a, int32_t b)
static constexpr int32_t	Sk32_can_overflow_add (int32_t a, int32_t b)
static constexpr int32_t	Sk32_can_overflow_sub (int32_t a, int32_t b)
static int32_t	SkAbs32 (int32_t value)

Function Documentation

Sk32_can_overflow_add()

static constexpr int32_t Sk32_can_overflow_add ( int32_t  a, int32_t  b  )

staticconstexpr

Definition at line 30 of file SkSafe32.h.

                                                                     {
    return (int32_t)((uint32_t)a + (uint32_t)b);
}

Sk32_can_overflow_sub()

static constexpr int32_t Sk32_can_overflow_sub ( int32_t  a, int32_t  b  )

staticconstexpr

Definition at line 33 of file SkSafe32.h.

                                                                     {
    return (int32_t)((uint32_t)a - (uint32_t)b);
}

Sk32_sat_add()

static constexpr int32_t Sk32_sat_add ( int32_t  a, int32_t  b  )

staticconstexpr

Definition at line 20 of file SkSafe32.h.

                                                            {
    return Sk64_pin_to_s32((int64_t)a + (int64_t)b);
}

Sk32_sat_sub()

static constexpr int32_t Sk32_sat_sub ( int32_t  a, int32_t  b  )

staticconstexpr

Definition at line 24 of file SkSafe32.h.

                                                            {
    return Sk64_pin_to_s32((int64_t)a - (int64_t)b);
}

Sk64_pin_to_s32()

static constexpr int32_t Sk64_pin_to_s32 ( int64_t  x )

staticconstexpr

Definition at line 16 of file SkSafe32.h.

                                                    {
    return x < SK_MinS32 ? SK_MinS32 : (x > SK_MaxS32 ? SK_MaxS32 : (int32_t)x);
}

SkAbs32()

static int32_t SkAbs32 ( int32_t  value )

inlinestatic

This is a 'safe' abs for 32-bit integers that asserts when undefined behavior would occur. SkTAbs (in SkTemplates.h) is a general purpose absolute-value function.

Definition at line 41 of file SkSafe32.h.

                                             {
    SkASSERT(value != SK_NaN32);  // The most negative int32_t can't be negated.
    if (value < 0) {
        value = -value;
    }
    return value;
}