1/*
2 * Copyright 2018 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8#ifndef SkSafe32_DEFINED
9#define SkSafe32_DEFINED
10
11#include "include/core/SkTypes.h"
12
13static constexpr int32_t Sk64_pin_to_s32(int64_t x) {
14 return x < SK_MinS32 ? SK_MinS32 : (x > SK_MaxS32 ? SK_MaxS32 : (int32_t)x);
15}
16
17static constexpr int32_t Sk32_sat_add(int32_t a, int32_t b) {
18 return Sk64_pin_to_s32((int64_t)a + (int64_t)b);
19}
20
21static constexpr int32_t Sk32_sat_sub(int32_t a, int32_t b) {
22 return Sk64_pin_to_s32((int64_t)a - (int64_t)b);
23}
24
25// To avoid UBSAN complaints about 2's compliment overflows
26//
27static constexpr int32_t Sk32_can_overflow_add(int32_t a, int32_t b) {
28 return (int32_t)((uint32_t)a + (uint32_t)b);
29}
30static constexpr int32_t Sk32_can_overflow_sub(int32_t a, int32_t b) {
31 return (int32_t)((uint32_t)a - (uint32_t)b);
32}
33
34#endif
35