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1 /* | 1 /* |
2 * Copyright 2008 The Android Open Source Project | 2 * Copyright 2008 The Android Open Source Project |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #include "SkMathPriv.h" | 8 #include "SkMathPriv.h" |
9 #include "SkFloatBits.h" | 9 #include "SkFloatBits.h" |
10 #include "SkFloatingPoint.h" | 10 #include "SkFloatingPoint.h" |
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36 if (x & 0xC) { | 36 if (x & 0xC) { |
37 sub_shift(zeros, x, 2); | 37 sub_shift(zeros, x, 2); |
38 } | 38 } |
39 if (x & 0x2) { | 39 if (x & 0x2) { |
40 sub_shift(zeros, x, 1); | 40 sub_shift(zeros, x, 1); |
41 } | 41 } |
42 | 42 |
43 return zeros; | 43 return zeros; |
44 } | 44 } |
45 | 45 |
46 SkFixed SkFixedMul_portable(SkFixed a, SkFixed b) { | |
47 #if defined(SkLONGLONG) | |
48 return static_cast<SkFixed>((int64_t)a * b >> 16); | |
49 #else | |
50 int sa = SkExtractSign(a); | |
51 int sb = SkExtractSign(b); | |
52 // now make them positive | |
53 a = SkApplySign(a, sa); | |
54 b = SkApplySign(b, sb); | |
55 | |
56 uint32_t ah = a >> 16; | |
57 uint32_t al = a & 0xFFFF; | |
58 uint32_t bh = b >> 16; | |
59 uint32_t bl = b & 0xFFFF; | |
60 | |
61 uint32_t R = ah * b + al * bh + (al * bl >> 16); | |
62 | |
63 return SkApplySign(R, sa ^ sb); | |
64 #endif | |
65 } | |
66 | |
67 /////////////////////////////////////////////////////////////////////////////// | 46 /////////////////////////////////////////////////////////////////////////////// |
68 | 47 |
69 #define DIVBITS_ITER(n) \ | 48 #define DIVBITS_ITER(n) \ |
70 case n: \ | 49 case n: \ |
71 if ((numer = (numer << 1) - denom) >= 0) \ | 50 if ((numer = (numer << 1) - denom) >= 0) \ |
72 result |= 1 << (n - 1); else numer += denom | 51 result |= 1 << (n - 1); else numer += denom |
73 | 52 |
74 int32_t SkDivBits(int32_t numer, int32_t denom, int shift_bias) { | 53 int32_t SkDivBits(int32_t numer, int32_t denom, int shift_bias) { |
75 SkASSERT(denom != 0); | 54 SkASSERT(denom != 0); |
76 if (numer == 0) { | 55 if (numer == 0) { |
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167 if (SkScalarNearlyZero(*cosValue)) { | 146 if (SkScalarNearlyZero(*cosValue)) { |
168 *cosValue = 0; | 147 *cosValue = 0; |
169 } | 148 } |
170 } | 149 } |
171 | 150 |
172 if (SkScalarNearlyZero(sinValue)) { | 151 if (SkScalarNearlyZero(sinValue)) { |
173 sinValue = 0; | 152 sinValue = 0; |
174 } | 153 } |
175 return sinValue; | 154 return sinValue; |
176 } | 155 } |
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