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/*
* Copyright (C) 2006-2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef SkFloat_DEFINED
#define SkFloat_DEFINED
#include "SkFixed.h"
class SkFloat {
public:
SkFloat() {}
void setZero() { fPacked = 0; }
// void setShift(int value, int shift) { fPacked = SetShift(value, shift); }
void setInt(int value) { fPacked = SetShift(value, 0); }
void setFixed(SkFixed value) { fPacked = SetShift(value, -16); }
void setFract(SkFract value) { fPacked = SetShift(value, -30); }
// int getShift(int shift) const { return GetShift(fPacked, shift); }
int getInt() const { return GetShift(fPacked, 0); }
SkFixed getFixed() const { return GetShift(fPacked, -16); }
SkFract getFract() const { return GetShift(fPacked, -30); }
void abs() { fPacked = Abs(fPacked); }
void negate() { fPacked = Neg(fPacked); }
void shiftLeft(int bits) { fPacked = Shift(fPacked, bits); }
void setShiftLeft(const SkFloat& a, int bits) { fPacked = Shift(a.fPacked, bits); }
void shiftRight(int bits) { fPacked = Shift(fPacked, -bits); }
void setShiftRight(const SkFloat& a, int bits) { fPacked = Shift(a.fPacked, -bits); }
void add(const SkFloat& a) { fPacked = Add(fPacked, a.fPacked); }
void setAdd(const SkFloat& a, const SkFloat& b) { fPacked = Add(a.fPacked, b.fPacked); }
void sub(const SkFloat& a) { fPacked = Add(fPacked, Neg(a.fPacked)); }
void setSub(const SkFloat& a, const SkFloat& b) { fPacked = Add(a.fPacked, Neg(b.fPacked)); }
void mul(const SkFloat& a) { fPacked = Mul(fPacked, a.fPacked); }
void setMul(const SkFloat& a, const SkFloat& b) { fPacked = Mul(a.fPacked, b.fPacked); }
void div(const SkFloat& a) { fPacked = Div(fPacked, a.fPacked); }
void setDiv(const SkFloat& a, const SkFloat& b) { fPacked = Div(a.fPacked, b.fPacked); }
void sqrt() { fPacked = Sqrt(fPacked); }
void setSqrt(const SkFloat& a) { fPacked = Sqrt(a.fPacked); }
void cubeRoot() { fPacked = CubeRoot(fPacked); }
void setCubeRoot(const SkFloat& a) { fPacked = CubeRoot(a.fPacked); }
friend bool operator==(const SkFloat& a, const SkFloat& b) { return a.fPacked == b.fPacked; }
friend bool operator!=(const SkFloat& a, const SkFloat& b) { return a.fPacked != b.fPacked; }
friend bool operator<(const SkFloat& a, const SkFloat& b) { return Cmp(a.fPacked, b.fPacked) < 0; }
friend bool operator<=(const SkFloat& a, const SkFloat& b) { return Cmp(a.fPacked, b.fPacked) <= 0; }
friend bool operator>(const SkFloat& a, const SkFloat& b) { return Cmp(a.fPacked, b.fPacked) > 0; }
friend bool operator>=(const SkFloat& a, const SkFloat& b) { return Cmp(a.fPacked, b.fPacked) >= 0; }
#ifdef SK_DEBUG
static void UnitTest();
void assertEquals(float f, int tolerance = 0)
{
union {
float fFloat;
int32_t fPacked;
} tmp;
tmp.fFloat = f;
int d = tmp.fPacked - fPacked;
SkASSERT(SkAbs32(d) <= tolerance);
}
float getFloat() const
{
union {
float fFloat;
int32_t fPacked;
} tmp;
tmp.fPacked = fPacked;
return tmp.fFloat;
}
#endif
private:
int32_t fPacked;
public:
static int GetShift(int32_t packed, int shift);
static int32_t SetShift(int value, int shift);
static int32_t Neg(int32_t);
static int32_t Abs(int32_t packed) { return (uint32_t)(packed << 1) >> 1; }
static int32_t Shift(int32_t, int bits);
static int32_t Add(int32_t, int32_t);
static int32_t Mul(int32_t, int32_t);
static int32_t MulInt(int32_t, int);
static int32_t Div(int32_t, int32_t);
static int32_t DivInt(int32_t, int);
static int32_t Invert(int32_t);
static int32_t Sqrt(int32_t);
static int32_t CubeRoot(int32_t);
static int Cmp(int32_t, int32_t);
};
#endif
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