skia2/include/private/SkSafe32.h
Kaloyan Donev dfffb39ca8 Fixed warnings for casting large type to smaller one.
Change-Id: Ib3e2661d0383bf154bc9178dac070dfd910a393c
Reviewed-on: https://skia-review.googlesource.com/115200
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
2018-03-27 13:28:24 +00:00

33 lines
885 B
C

/*
* 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
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