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1 | 1 |
2 /* | 2 /* |
3 * Copyright 2006 The Android Open Source Project | 3 * Copyright 2006 The Android Open Source Project |
4 * | 4 * |
5 * Use of this source code is governed by a BSD-style license that can be | 5 * Use of this source code is governed by a BSD-style license that can be |
6 * found in the LICENSE file. | 6 * found in the LICENSE file. |
7 */ | 7 */ |
8 | 8 |
9 | 9 |
10 #ifndef SkFloatingPoint_DEFINED | 10 #ifndef SkFloatingPoint_DEFINED |
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84 #define sk_float_acos(x) acosf(x) | 84 #define sk_float_acos(x) acosf(x) |
85 #define sk_float_asin(x) asinf(x) | 85 #define sk_float_asin(x) asinf(x) |
86 #endif | 86 #endif |
87 #define sk_float_atan2(y,x) atan2f(y,x) | 87 #define sk_float_atan2(y,x) atan2f(y,x) |
88 #define sk_float_abs(x) fabsf(x) | 88 #define sk_float_abs(x) fabsf(x) |
89 #define sk_float_mod(x,y) fmodf(x,y) | 89 #define sk_float_mod(x,y) fmodf(x,y) |
90 #define sk_float_exp(x) expf(x) | 90 #define sk_float_exp(x) expf(x) |
91 #define sk_float_log(x) logf(x) | 91 #define sk_float_log(x) logf(x) |
92 #endif | 92 #endif |
93 | 93 |
| 94 #define sk_float_round(x) sk_float_floor((x) + 0.5f) |
| 95 |
94 // can't find log2f on android, but maybe that just a tool bug? | 96 // can't find log2f on android, but maybe that just a tool bug? |
95 #ifdef SK_BUILD_FOR_ANDROID | 97 #ifdef SK_BUILD_FOR_ANDROID |
96 static inline float sk_float_log2(float x) { | 98 static inline float sk_float_log2(float x) { |
97 const double inv_ln_2 = 1.44269504088896; | 99 const double inv_ln_2 = 1.44269504088896; |
98 return (float)(log(x) * inv_ln_2); | 100 return (float)(log(x) * inv_ln_2); |
99 } | 101 } |
100 #else | 102 #else |
101 #define sk_float_log2(x) log2f(x) | 103 #define sk_float_log2(x) log2f(x) |
102 #endif | 104 #endif |
103 | 105 |
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175 float estimate = *SkTCast<float*>(&i); | 177 float estimate = *SkTCast<float*>(&i); |
176 | 178 |
177 // One step of Newton's method to refine. | 179 // One step of Newton's method to refine. |
178 const float estimate_sq = estimate*estimate; | 180 const float estimate_sq = estimate*estimate; |
179 estimate *= (1.5f-0.5f*x*estimate_sq); | 181 estimate *= (1.5f-0.5f*x*estimate_sq); |
180 return estimate; | 182 return estimate; |
181 #endif | 183 #endif |
182 } | 184 } |
183 | 185 |
184 #endif | 186 #endif |
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