1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/src/core/SkFloat.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,107 @@
1.4 +
1.5 +/*
1.6 + * Copyright 2008 The Android Open Source Project
1.7 + *
1.8 + * Use of this source code is governed by a BSD-style license that can be
1.9 + * found in the LICENSE file.
1.10 + */
1.11 +
1.12 +
1.13 +#ifndef SkFloat_DEFINED
1.14 +#define SkFloat_DEFINED
1.15 +
1.16 +#include "SkFixed.h"
1.17 +
1.18 +class SkFloat {
1.19 +public:
1.20 + SkFloat() {}
1.21 +
1.22 + void setZero() { fPacked = 0; }
1.23 +// void setShift(int value, int shift) { fPacked = SetShift(value, shift); }
1.24 + void setInt(int value) { fPacked = SetShift(value, 0); }
1.25 + void setFixed(SkFixed value) { fPacked = SetShift(value, -16); }
1.26 +
1.27 +// int getShift(int shift) const { return GetShift(fPacked, shift); }
1.28 + int getInt() const { return GetShift(fPacked, 0); }
1.29 + SkFixed getFixed() const { return GetShift(fPacked, -16); }
1.30 +
1.31 + void abs() { fPacked = Abs(fPacked); }
1.32 + void negate() { fPacked = Neg(fPacked); }
1.33 +
1.34 + void shiftLeft(int bits) { fPacked = Shift(fPacked, bits); }
1.35 + void setShiftLeft(const SkFloat& a, int bits) { fPacked = Shift(a.fPacked, bits); }
1.36 +
1.37 + void shiftRight(int bits) { fPacked = Shift(fPacked, -bits); }
1.38 + void setShiftRight(const SkFloat& a, int bits) { fPacked = Shift(a.fPacked, -bits); }
1.39 +
1.40 + void add(const SkFloat& a) { fPacked = Add(fPacked, a.fPacked); }
1.41 + void setAdd(const SkFloat& a, const SkFloat& b) { fPacked = Add(a.fPacked, b.fPacked); }
1.42 +
1.43 + void sub(const SkFloat& a) { fPacked = Add(fPacked, Neg(a.fPacked)); }
1.44 + void setSub(const SkFloat& a, const SkFloat& b) { fPacked = Add(a.fPacked, Neg(b.fPacked)); }
1.45 +
1.46 + void mul(const SkFloat& a) { fPacked = Mul(fPacked, a.fPacked); }
1.47 + void setMul(const SkFloat& a, const SkFloat& b) { fPacked = Mul(a.fPacked, b.fPacked); }
1.48 +
1.49 + void div(const SkFloat& a) { fPacked = Div(fPacked, a.fPacked); }
1.50 + void setDiv(const SkFloat& a, const SkFloat& b) { fPacked = Div(a.fPacked, b.fPacked); }
1.51 +
1.52 + void sqrt() { fPacked = Sqrt(fPacked); }
1.53 + void setSqrt(const SkFloat& a) { fPacked = Sqrt(a.fPacked); }
1.54 + void cubeRoot() { fPacked = CubeRoot(fPacked); }
1.55 + void setCubeRoot(const SkFloat& a) { fPacked = CubeRoot(a.fPacked); }
1.56 +
1.57 + friend bool operator==(const SkFloat& a, const SkFloat& b) { return a.fPacked == b.fPacked; }
1.58 + friend bool operator!=(const SkFloat& a, const SkFloat& b) { return a.fPacked != b.fPacked; }
1.59 + friend bool operator<(const SkFloat& a, const SkFloat& b) { return Cmp(a.fPacked, b.fPacked) < 0; }
1.60 + friend bool operator<=(const SkFloat& a, const SkFloat& b) { return Cmp(a.fPacked, b.fPacked) <= 0; }
1.61 + friend bool operator>(const SkFloat& a, const SkFloat& b) { return Cmp(a.fPacked, b.fPacked) > 0; }
1.62 + friend bool operator>=(const SkFloat& a, const SkFloat& b) { return Cmp(a.fPacked, b.fPacked) >= 0; }
1.63 +
1.64 +#ifdef SK_DEBUG
1.65 + static void UnitTest();
1.66 +
1.67 + void assertEquals(float f, int tolerance = 0)
1.68 + {
1.69 + union {
1.70 + float fFloat;
1.71 + int32_t fPacked;
1.72 + } tmp;
1.73 +
1.74 + tmp.fFloat = f;
1.75 + int d = tmp.fPacked - fPacked;
1.76 + SkASSERT(SkAbs32(d) <= tolerance);
1.77 + }
1.78 + float getFloat() const
1.79 + {
1.80 + union {
1.81 + float fFloat;
1.82 + int32_t fPacked;
1.83 + } tmp;
1.84 +
1.85 + tmp.fPacked = fPacked;
1.86 + return tmp.fFloat;
1.87 + }
1.88 +#endif
1.89 +
1.90 +private:
1.91 + int32_t fPacked;
1.92 +
1.93 +public:
1.94 + static int GetShift(int32_t packed, int shift);
1.95 + static int32_t SetShift(int value, int shift);
1.96 + static int32_t Neg(int32_t);
1.97 + static int32_t Abs(int32_t packed) { return (uint32_t)(packed << 1) >> 1; }
1.98 + static int32_t Shift(int32_t, int bits);
1.99 + static int32_t Add(int32_t, int32_t);
1.100 + static int32_t Mul(int32_t, int32_t);
1.101 + static int32_t MulInt(int32_t, int);
1.102 + static int32_t Div(int32_t, int32_t);
1.103 + static int32_t DivInt(int32_t, int);
1.104 + static int32_t Invert(int32_t);
1.105 + static int32_t Sqrt(int32_t);
1.106 + static int32_t CubeRoot(int32_t);
1.107 + static int Cmp(int32_t, int32_t);
1.108 +};
1.109 +
1.110 +#endif
