2018-01-30 21:01:33 +00:00
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/*
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* Copyright 2018 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkSafe32_DEFINED
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#define SkSafe32_DEFINED
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2018-05-10 14:55:43 +00:00
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#include "SkTypes.h"
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2018-01-30 21:01:33 +00:00
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static constexpr int32_t Sk64_pin_to_s32(int64_t x) {
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2018-03-20 08:38:31 +00:00
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return x < SK_MinS32 ? SK_MinS32 : (x > SK_MaxS32 ? SK_MaxS32 : (int32_t)x);
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2018-01-30 21:01:33 +00:00
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}
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static constexpr int32_t Sk32_sat_add(int32_t a, int32_t b) {
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return Sk64_pin_to_s32((int64_t)a + (int64_t)b);
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}
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static constexpr int32_t Sk32_sat_sub(int32_t a, int32_t b) {
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return Sk64_pin_to_s32((int64_t)a - (int64_t)b);
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}
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// To avoid UBSAN complaints about 2's compliment overflows
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//
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2018-02-15 16:17:56 +00:00
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static constexpr int32_t Sk32_can_overflow_add(int32_t a, int32_t b) {
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return (int32_t)((uint32_t)a + (uint32_t)b);
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}
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2018-01-30 21:01:33 +00:00
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static constexpr int32_t Sk32_can_overflow_sub(int32_t a, int32_t b) {
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return (int32_t)((uint32_t)a - (uint32_t)b);
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}
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#endif
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