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/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkSafe32_DEFINED
#define SkSafe32_DEFINED
#include "include/private/base/SkAssert.h"
#include "include/private/base/SkMath.h"
#include <cstdint>
static constexpr int32_t Sk64_pin_to_s32(int64_t x) {
return x < SK_MinS32 ? SK_MinS32 : (x > SK_MaxS32 ? SK_MaxS32 : (int32_t)x);
}
static constexpr int32_t Sk32_sat_add(int32_t a, int32_t b) {
return Sk64_pin_to_s32((int64_t)a + (int64_t)b);
}
static constexpr int32_t Sk32_sat_sub(int32_t a, int32_t b) {
return Sk64_pin_to_s32((int64_t)a - (int64_t)b);
}
// To avoid UBSAN complaints about 2's compliment overflows
//
static constexpr int32_t Sk32_can_overflow_add(int32_t a, int32_t b) {
return (int32_t)((uint32_t)a + (uint32_t)b);
}
static constexpr int32_t Sk32_can_overflow_sub(int32_t a, int32_t b) {
return (int32_t)((uint32_t)a - (uint32_t)b);
}
/**
* 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.
*/
static inline int32_t SkAbs32(int32_t value) {
SkASSERT(value != SK_NaN32); // The most negative int32_t can't be negated.
if (value < 0) {
value = -value;
}
return value;
}
#endif
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