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| 1 /* | 1 /* |
| 2 * Copyright 2012 Google Inc. | 2 * Copyright 2012 Google Inc. |
| 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 #ifndef SkPathOpsTypes_DEFINED | 7 #ifndef SkPathOpsTypes_DEFINED |
| 8 #define SkPathOpsTypes_DEFINED | 8 #define SkPathOpsTypes_DEFINED |
| 9 | 9 |
| 10 #include <float.h> // for FLT_EPSILON | 10 #include <float.h> // for FLT_EPSILON |
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| 134 } | 134 } |
| 135 | 135 |
| 136 inline bool approximately_zero_sqrt(double x) { | 136 inline bool approximately_zero_sqrt(double x) { |
| 137 return fabs(x) < FLT_EPSILON_SQRT; | 137 return fabs(x) < FLT_EPSILON_SQRT; |
| 138 } | 138 } |
| 139 | 139 |
| 140 inline bool roughly_zero(double x) { | 140 inline bool roughly_zero(double x) { |
| 141 return fabs(x) < ROUGH_EPSILON; | 141 return fabs(x) < ROUGH_EPSILON; |
| 142 } | 142 } |
| 143 | 143 |
| 144 #if 0 // unused for now | |
| 145 inline bool way_roughly_zero(double x) { | |
| 146 return fabs(x) < WAY_ROUGH_EPSILON; | |
| 147 } | |
| 148 #endif | |
| 149 | |
| 150 inline bool approximately_zero_inverse(double x) { | 144 inline bool approximately_zero_inverse(double x) { |
| 151 return fabs(x) > FLT_EPSILON_INVERSE; | 145 return fabs(x) > FLT_EPSILON_INVERSE; |
| 152 } | 146 } |
| 153 | 147 |
| 154 // OPTIMIZATION: if called multiple times with the same denom, we want to pass 1
/y instead | 148 // OPTIMIZATION: if called multiple times with the same denom, we want to pass 1
/y instead |
| 155 inline bool approximately_zero_when_compared_to(double x, double y) { | 149 inline bool approximately_zero_when_compared_to(double x, double y) { |
| 156 return x == 0 || fabs(x) < fabs(y * FLT_EPSILON); | 150 return x == 0 || fabs(x) < fabs(y * FLT_EPSILON); |
| 157 } | 151 } |
| 158 | 152 |
| 159 // Use this for comparing Ts in the range of 0 to 1. For general numbers (larger
and smaller) use | 153 // Use this for comparing Ts in the range of 0 to 1. For general numbers (larger
and smaller) use |
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| 377 */ | 371 */ |
| 378 inline int SkDSideBit(double x) { | 372 inline int SkDSideBit(double x) { |
| 379 return 1 << SKDSide(x); | 373 return 1 << SKDSide(x); |
| 380 } | 374 } |
| 381 | 375 |
| 382 inline double SkPinT(double t) { | 376 inline double SkPinT(double t) { |
| 383 return precisely_less_than_zero(t) ? 0 : precisely_greater_than_one(t) ? 1 :
t; | 377 return precisely_less_than_zero(t) ? 0 : precisely_greater_than_one(t) ? 1 :
t; |
| 384 } | 378 } |
| 385 | 379 |
| 386 #endif | 380 #endif |
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