1 /* 2 * Copyright (C) 2006-2008 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef SkFloat_DEFINED 18 #define SkFloat_DEFINED 19 20 #include "SkFixed.h" 21 22 class SkFloat { 23 public: 24 SkFloat() {} 25 26 void setZero() { fPacked = 0; } 27 // void setShift(int value, int shift) { fPacked = SetShift(value, shift); } 28 void setInt(int value) { fPacked = SetShift(value, 0); } 29 void setFixed(SkFixed value) { fPacked = SetShift(value, -16); } 30 void setFract(SkFract value) { fPacked = SetShift(value, -30); } 31 32 // int getShift(int shift) const { return GetShift(fPacked, shift); } 33 int getInt() const { return GetShift(fPacked, 0); } 34 SkFixed getFixed() const { return GetShift(fPacked, -16); } 35 SkFract getFract() const { return GetShift(fPacked, -30); } 36 37 void abs() { fPacked = Abs(fPacked); } 38 void negate() { fPacked = Neg(fPacked); } 39 40 void shiftLeft(int bits) { fPacked = Shift(fPacked, bits); } 41 void setShiftLeft(const SkFloat& a, int bits) { fPacked = Shift(a.fPacked, bits); } 42 43 void shiftRight(int bits) { fPacked = Shift(fPacked, -bits); } 44 void setShiftRight(const SkFloat& a, int bits) { fPacked = Shift(a.fPacked, -bits); } 45 46 void add(const SkFloat& a) { fPacked = Add(fPacked, a.fPacked); } 47 void setAdd(const SkFloat& a, const SkFloat& b) { fPacked = Add(a.fPacked, b.fPacked); } 48 49 void sub(const SkFloat& a) { fPacked = Add(fPacked, Neg(a.fPacked)); } 50 void setSub(const SkFloat& a, const SkFloat& b) { fPacked = Add(a.fPacked, Neg(b.fPacked)); } 51 52 void mul(const SkFloat& a) { fPacked = Mul(fPacked, a.fPacked); } 53 void setMul(const SkFloat& a, const SkFloat& b) { fPacked = Mul(a.fPacked, b.fPacked); } 54 55 void div(const SkFloat& a) { fPacked = Div(fPacked, a.fPacked); } 56 void setDiv(const SkFloat& a, const SkFloat& b) { fPacked = Div(a.fPacked, b.fPacked); } 57 58 void sqrt() { fPacked = Sqrt(fPacked); } 59 void setSqrt(const SkFloat& a) { fPacked = Sqrt(a.fPacked); } 60 void cubeRoot() { fPacked = CubeRoot(fPacked); } 61 void setCubeRoot(const SkFloat& a) { fPacked = CubeRoot(a.fPacked); } 62 63 friend bool operator==(const SkFloat& a, const SkFloat& b) { return a.fPacked == b.fPacked; } 64 friend bool operator!=(const SkFloat& a, const SkFloat& b) { return a.fPacked != b.fPacked; } 65 friend bool operator<(const SkFloat& a, const SkFloat& b) { return Cmp(a.fPacked, b.fPacked) < 0; } 66 friend bool operator<=(const SkFloat& a, const SkFloat& b) { return Cmp(a.fPacked, b.fPacked) <= 0; } 67 friend bool operator>(const SkFloat& a, const SkFloat& b) { return Cmp(a.fPacked, b.fPacked) > 0; } 68 friend bool operator>=(const SkFloat& a, const SkFloat& b) { return Cmp(a.fPacked, b.fPacked) >= 0; } 69 70 #ifdef SK_DEBUG 71 static void UnitTest(); 72 73 void assertEquals(float f, int tolerance = 0) 74 { 75 union { 76 float fFloat; 77 int32_t fPacked; 78 } tmp; 79 80 tmp.fFloat = f; 81 int d = tmp.fPacked - fPacked; 82 SkASSERT(SkAbs32(d) <= tolerance); 83 } 84 float getFloat() const 85 { 86 union { 87 float fFloat; 88 int32_t fPacked; 89 } tmp; 90 91 tmp.fPacked = fPacked; 92 return tmp.fFloat; 93 } 94 #endif 95 96 private: 97 int32_t fPacked; 98 99 public: 100 static int GetShift(int32_t packed, int shift); 101 static int32_t SetShift(int value, int shift); 102 static int32_t Neg(int32_t); 103 static int32_t Abs(int32_t packed) { return (uint32_t)(packed << 1) >> 1; } 104 static int32_t Shift(int32_t, int bits); 105 static int32_t Add(int32_t, int32_t); 106 static int32_t Mul(int32_t, int32_t); 107 static int32_t MulInt(int32_t, int); 108 static int32_t Div(int32_t, int32_t); 109 static int32_t DivInt(int32_t, int); 110 static int32_t Invert(int32_t); 111 static int32_t Sqrt(int32_t); 112 static int32_t CubeRoot(int32_t); 113 static int Cmp(int32_t, int32_t); 114 }; 115 116 #endif 117
