| /* |
| * 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/core/SkTypes.h" |
| |
| 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); |
| } |
| |
| #endif |
