author | Simon Howkins <simonh@symbian.org> |
Mon, 15 Nov 2010 14:53:34 +0000 | |
branch | RCL_3 |
changeset 105 | 871af676edac |
parent 0 | dd21522fd290 |
permissions | -rw-r--r-- |
0
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/* |
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* Copyright (C) 2006, 2007 Apple Inc. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY |
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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|
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#ifndef WTF_MathExtras_h |
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#define WTF_MathExtras_h |
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|
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#include <math.h> |
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#include <time.h> |
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#if COMPILER(MSVC) |
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#include "kjs/operations.h" |
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#include "kjs/value.h" |
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#include <xmath.h> |
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#include <limits> |
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#if HAVE(FLOAT_H) |
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#include <float.h> |
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#endif |
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#endif |
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#ifndef M_PI |
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const double piDouble = 3.14159265358979323846; |
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const float piFloat = 3.14159265358979323846f; |
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#else |
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const double piDouble = M_PI; |
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const float piFloat = static_cast<float>(M_PI); |
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#endif |
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#ifndef M_PI_4 |
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const double piOverFourDouble = 0.785398163397448309616; |
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const float piOverFourFloat = 0.785398163397448309616f; |
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#else |
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const double piOverFourDouble = M_PI_4; |
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const float piOverFourFloat = static_cast<float>(M_PI_4); |
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#endif |
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#if COMPILER(MSVC) |
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inline bool isinf(double num) { return !_finite(num) && !_isnan(num); } |
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inline bool isnan(double num) { return !!_isnan(num); } |
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inline long lround(double num) { return static_cast<long>(num > 0 ? num + 0.5 : ceil(num - 0.5)); } |
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inline long lroundf(float num) { return static_cast<long>(num > 0 ? num + 0.5f : ceilf(num - 0.5f)); } |
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inline double round(double num) { return num > 0 ? floor(num + 0.5) : ceil(num - 0.5); } |
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inline float roundf(float num) { return num > 0 ? floorf(num + 0.5f) : ceilf(num - 0.5f); } |
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inline bool signbit(double num) { return _copysign(1.0, num) < 0; } |
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inline double nextafter(double x, double y) { return _nextafter(x, y); } |
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inline float nextafterf(float x, float y) { return x > y ? x - FLT_EPSILON : x + FLT_EPSILON; } |
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inline double copysign(double x, double y) { return _copysign(x, y); } |
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inline int isfinite(double x) { return _finite(x); } |
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// Work around a bug in Win, where atan2(+-infinity, +-infinity) yields NaN instead of specific values. |
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inline double wtf_atan2(double x, double y) |
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{ |
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static double posInf = std::numeric_limits<double>::infinity(); |
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static double negInf = -std::numeric_limits<double>::infinity(); |
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double result = KJS::NaN; |
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if (x == posInf && y == posInf) |
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result = piOverFourDouble; |
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else if (x == posInf && y == negInf) |
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result = 3 * piOverFourDouble; |
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else if (x == negInf && y == posInf) |
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result = -piOverFourDouble; |
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else if (x == negInf && y == negInf) |
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result = -3 * piOverFourDouble; |
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else |
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result = ::atan2(x, y); |
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return result; |
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} |
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// Work around a bug in the Microsoft CRT, where fmod(x, +-infinity) yields NaN instead of x. |
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inline double wtf_fmod(double x, double y) { return (!isinf(x) && isinf(y)) ? x : fmod(x, y); } |
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#define fmod(x, y) wtf_fmod(x, y) |
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#define atan2(x, y) wtf_atan2(x, y) |
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|
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#if defined(_CRT_RAND_S) |
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// Initializes the random number generator. |
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inline void wtf_random_init() |
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{ |
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// No need to initialize for rand_s. |
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} |
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|
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// Returns a pseudo-random number in the range [0, 1). |
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inline double wtf_random() |
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{ |
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unsigned u; |
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rand_s(&u); |
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return static_cast<double>(u) / (static_cast<double>(UINT_MAX) + 1.0); |
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} |
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#endif // _CRT_RAND_S |
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|
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#else |
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124 |
|
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// Initializes the random number generator. |
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inline void wtf_random_init() |
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{ |
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srand(static_cast<unsigned>(time(0))); |
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} |
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|
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// Returns a pseudo-random number in the range [0, 1). |
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inline double wtf_random() |
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{ |
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return static_cast<double>(rand()) / (static_cast<double>(RAND_MAX) + 1.0); |
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} |
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|
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#endif // #if COMPILER(MSVC) |
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|
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#if PLATFORM(SYMBIAN) |
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|
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#define FLT_EPSILON 1.19209290E-07F /* b**(1-p) */ |
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#ifndef M_PI |
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#define M_PI 3.14159265358979323846 |
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#endif // M_PI |
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|
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#ifndef M_PI_4 |
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#define M_PI_4 0.785398163397448309616 |
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#endif // M_PI_4 |
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|
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#include <e32math.h> |
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|
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#define ceilf ceil |
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#define fmodf fmod |
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#define floorf floor |
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inline long lround(double num) { return static_cast<long>(num > 0 ? num + 0.5 : ceil(num - 0.5)); } |
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inline float lroundf(float num) { return num > 0 ? num + 0.5f : ceilf(num - 0.5f); } |
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inline float roundf(float num) { return num > 0 ? floorf(num + 0.5f) : ceilf(num - 0.5f); } |
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inline int isfinite(double x) { return Math::IsFinite(x); } |
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inline bool signbit(double num) { return copysign(1.0, num) < 0; } |
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inline float nextafterf(float x, float y) { return x > y ? x - FLT_EPSILON : x + FLT_EPSILON; } |
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|
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//tot:taken from mruntime |
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typedef union |
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{ |
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double value; |
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struct |
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{ |
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unsigned int msw; |
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unsigned int lsw; |
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} parts; |
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} ieee_double_shape_type; |
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|
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#define EXTRACT_WORDS(ix0,ix1,d) \ |
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do { \ |
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ieee_double_shape_type ew_u; \ |
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ew_u.value = (d); \ |
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(ix0) = ew_u.parts.msw; \ |
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(ix1) = ew_u.parts.lsw; \ |
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} while (0) |
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|
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#define INSERT_WORDS(d,ix0,ix1) \ |
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do { \ |
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ieee_double_shape_type iw_u; \ |
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iw_u.parts.msw = (ix0); \ |
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iw_u.parts.lsw = (ix1); \ |
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(d) = iw_u.value; \ |
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} while (0) |
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|
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inline double nextafter(double x, double y) |
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{ |
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volatile double t; |
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int hx,hy,ix,iy; |
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unsigned int lx,ly; |
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|
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EXTRACT_WORDS(hx,lx,x); |
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EXTRACT_WORDS(hy,ly,y); |
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ix = hx&0x7fffffff; /* |x| */ |
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iy = hy&0x7fffffff; /* |y| */ |
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|
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if(((ix>=0x7ff00000)&&((ix-0x7ff00000)|lx)!=0) || /* x is nan */ |
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((iy>=0x7ff00000)&&((iy-0x7ff00000)|ly)!=0)) /* y is nan */ |
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return x+y; |
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if(x==y) return y; /* x=y, return y */ |
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if((ix|lx)==0) { /* x == 0 */ |
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INSERT_WORDS(x,hy&0x80000000,1); /* return +-minsubnormal */ |
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t = x*x; |
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if(t==x) return t; else return x; /* raise underflow flag */ |
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} |
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if(hx>=0) { /* x > 0 */ |
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if(hx>hy||((hx==hy)&&(lx>ly))) { /* x > y, x -= ulp */ |
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if(lx==0) hx -= 1; |
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lx -= 1; |
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} else { /* x < y, x += ulp */ |
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lx += 1; |
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if(lx==0) hx += 1; |
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} |
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} else { /* x < 0 */ |
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if(hy>=0||hx>hy||((hx==hy)&&(lx>ly))){/* x < y, x -= ulp */ |
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if(lx==0) hx -= 1; |
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lx -= 1; |
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} else { /* x > y, x += ulp */ |
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lx += 1; |
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if(lx==0) hx += 1; |
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} |
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} |
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hy = hx&0x7ff00000; |
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if(hy>=0x7ff00000) return x+x; /* overflow */ |
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if(hy<0x00100000) { /* underflow */ |
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t = x*x; |
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if(t!=x) { /* raise underflow flag */ |
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INSERT_WORDS(y,hx,lx); |
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return y; |
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} |
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} |
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INSERT_WORDS(x,hx,lx); |
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return x; |
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} |
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|
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inline float atan2f(float x, float y) |
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{ |
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return ((float)atan2((double)x, (double)y)); |
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} |
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|
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inline float cosf(float x) |
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{ |
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return ((float)cos((double)x)); |
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} |
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|
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inline float sinf(float x) |
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{ |
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return ((float)sin((double)x)); |
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} |
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|
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|
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#endif // #if PLATFORM(SYMBIAN) |
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|
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#endif // #ifndef WTF_MathExtras_h |