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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 "SkCordic.h" | 9 #include "SkCordic.h" |
10 #include "SkFloatBits.h" | 10 #include "SkFloatBits.h" |
11 #include "SkFloatingPoint.h" | 11 #include "SkFloatingPoint.h" |
12 #include "Sk64.h" | 12 #include "Sk64.h" |
13 #include "SkScalar.h" | 13 #include "SkScalar.h" |
14 | 14 |
15 #ifdef SK_SCALAR_IS_FLOAT | 15 const uint32_t gIEEENotANumber = 0x7FFFFFFF; |
16 const uint32_t gIEEENotANumber = 0x7FFFFFFF; | 16 const uint32_t gIEEEInfinity = 0x7F800000; |
17 const uint32_t gIEEEInfinity = 0x7F800000; | 17 const uint32_t gIEEENegativeInfinity = 0xFF800000; |
18 const uint32_t gIEEENegativeInfinity = 0xFF800000; | |
19 #endif | |
20 | 18 |
21 #define sub_shift(zeros, x, n) \ | 19 #define sub_shift(zeros, x, n) \ |
22 zeros -= n; \ | 20 zeros -= n; \ |
23 x >>= n | 21 x >>= n |
24 | 22 |
25 int SkCLZ_portable(uint32_t x) { | 23 int SkCLZ_portable(uint32_t x) { |
26 if (x == 0) { | 24 if (x == 0) { |
27 return 32; | 25 return 32; |
28 } | 26 } |
29 | 27 |
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369 | 367 |
370 SkFixed SkFixedMean(SkFixed a, SkFixed b) { | 368 SkFixed SkFixedMean(SkFixed a, SkFixed b) { |
371 Sk64 tmp; | 369 Sk64 tmp; |
372 | 370 |
373 tmp.setMul(a, b); | 371 tmp.setMul(a, b); |
374 return tmp.getSqrt(); | 372 return tmp.getSqrt(); |
375 } | 373 } |
376 | 374 |
377 /////////////////////////////////////////////////////////////////////////////// | 375 /////////////////////////////////////////////////////////////////////////////// |
378 | 376 |
379 #ifdef SK_SCALAR_IS_FLOAT | |
380 float SkScalarSinCos(float radians, float* cosValue) { | 377 float SkScalarSinCos(float radians, float* cosValue) { |
381 float sinValue = sk_float_sin(radians); | 378 float sinValue = sk_float_sin(radians); |
382 | 379 |
383 if (cosValue) { | 380 if (cosValue) { |
384 *cosValue = sk_float_cos(radians); | 381 *cosValue = sk_float_cos(radians); |
385 if (SkScalarNearlyZero(*cosValue)) { | 382 if (SkScalarNearlyZero(*cosValue)) { |
386 *cosValue = 0; | 383 *cosValue = 0; |
387 } | 384 } |
388 } | 385 } |
389 | 386 |
390 if (SkScalarNearlyZero(sinValue)) { | 387 if (SkScalarNearlyZero(sinValue)) { |
391 sinValue = 0; | 388 sinValue = 0; |
392 } | 389 } |
393 return sinValue; | 390 return sinValue; |
394 } | 391 } |
395 #endif | |
396 | 392 |
397 #define INTERP_SINTABLE | 393 #define INTERP_SINTABLE |
398 #define BUILD_TABLE_AT_RUNTIMEx | 394 #define BUILD_TABLE_AT_RUNTIMEx |
399 | 395 |
400 #define kTableSize 256 | 396 #define kTableSize 256 |
401 | 397 |
402 #ifdef BUILD_TABLE_AT_RUNTIME | 398 #ifdef BUILD_TABLE_AT_RUNTIME |
403 static uint16_t gSkSinTable[kTableSize]; | 399 static uint16_t gSkSinTable[kTableSize]; |
404 | 400 |
405 static void build_sintable(uint16_t table[]) { | 401 static void build_sintable(uint16_t table[]) { |
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508 } | 504 } |
509 | 505 |
510 /////////////////////////////////////////////////////////////////////////////// | 506 /////////////////////////////////////////////////////////////////////////////// |
511 | 507 |
512 SkFixed SkFixedTan(SkFixed radians) { return SkCordicTan(radians); } | 508 SkFixed SkFixedTan(SkFixed radians) { return SkCordicTan(radians); } |
513 SkFixed SkFixedASin(SkFixed x) { return SkCordicASin(x); } | 509 SkFixed SkFixedASin(SkFixed x) { return SkCordicASin(x); } |
514 SkFixed SkFixedACos(SkFixed x) { return SkCordicACos(x); } | 510 SkFixed SkFixedACos(SkFixed x) { return SkCordicACos(x); } |
515 SkFixed SkFixedATan2(SkFixed y, SkFixed x) { return SkCordicATan2(y, x); } | 511 SkFixed SkFixedATan2(SkFixed y, SkFixed x) { return SkCordicATan2(y, x); } |
516 SkFixed SkFixedExp(SkFixed x) { return SkCordicExp(x); } | 512 SkFixed SkFixedExp(SkFixed x) { return SkCordicExp(x); } |
517 SkFixed SkFixedLog(SkFixed x) { return SkCordicLog(x); } | 513 SkFixed SkFixedLog(SkFixed x) { return SkCordicLog(x); } |
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