text: /*
   * 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 "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
  