78 lines
2.2 KiB
C++
78 lines
2.2 KiB
C++
/*
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* Copyright 2006 The Android Open Source Project
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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 SkMath_DEFINED
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#define SkMath_DEFINED
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#include "include/private/base/SkAssert.h"
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#include "include/private/base/SkCPUTypes.h"
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#include <cstdint>
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#include <climits>
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// Max Signed 16 bit value
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static constexpr int16_t SK_MaxS16 = INT16_MAX;
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static constexpr int16_t SK_MinS16 = -SK_MaxS16;
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static constexpr int32_t SK_MaxS32 = INT32_MAX;
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static constexpr int32_t SK_MinS32 = -SK_MaxS32;
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static constexpr int32_t SK_NaN32 = INT32_MIN;
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static constexpr int64_t SK_MaxS64 = INT64_MAX;
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static constexpr int64_t SK_MinS64 = -SK_MaxS64;
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// 64bit -> 32bit utilities
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// Handy util that can be passed two ints, and will automatically promote to
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// 64bits before the multiply, so the caller doesn't have to remember to cast
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// e.g. (int64_t)a * b;
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static inline int64_t sk_64_mul(int64_t a, int64_t b) {
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return a * b;
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}
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static inline constexpr int32_t SkLeftShift(int32_t value, int32_t shift) {
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return (int32_t) ((uint32_t) value << shift);
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}
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static inline constexpr int64_t SkLeftShift(int64_t value, int32_t shift) {
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return (int64_t) ((uint64_t) value << shift);
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}
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///////////////////////////////////////////////////////////////////////////////
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/**
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* Returns true if value is a power of 2. Does not explicitly check for
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* value <= 0.
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*/
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template <typename T> constexpr inline bool SkIsPow2(T value) {
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return (value & (value - 1)) == 0;
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}
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///////////////////////////////////////////////////////////////////////////////
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/**
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* Return a*b/((1 << shift) - 1), rounding any fractional bits.
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* Only valid if a and b are unsigned and <= 32767 and shift is > 0 and <= 8
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*/
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static inline unsigned SkMul16ShiftRound(U16CPU a, U16CPU b, int shift) {
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SkASSERT(a <= 32767);
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SkASSERT(b <= 32767);
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SkASSERT(shift > 0 && shift <= 8);
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unsigned prod = a*b + (1 << (shift - 1));
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return (prod + (prod >> shift)) >> shift;
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}
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/**
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* Return a*b/255, rounding any fractional bits.
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* Only valid if a and b are unsigned and <= 32767.
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*/
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static inline U8CPU SkMulDiv255Round(U16CPU a, U16CPU b) {
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return SkMul16ShiftRound(a, b, 8);
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}
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#endif
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