The Tor Browser: comparison gfx/skia/trunk/include/core/SkScalar.h

--1:000000000000
+:40e2c07bc220
+/*
+* Copyright 2006 The Android Open Source Project
+*
+* Use of this source code is governed by a BSD-style license that can be
+* found in the LICENSE file.
+*/
+#ifndef SkScalar_DEFINED
+#define SkScalar_DEFINED
+#include "SkFixed.h"
+#include "SkFloatingPoint.h"
+//#define SK_SUPPORT_DEPRECATED_SCALARROUND
+typedef float   SkScalar;
+/** SK_Scalar1 is defined to be 1.0 represented as an SkScalar
+*/
+#define SK_Scalar1              (1.0f)
+/** SK_Scalar1 is defined to be 1/2 represented as an SkScalar
+*/
+#define SK_ScalarHalf           (0.5f)
+/** SK_ScalarInfinity is defined to be infinity as an SkScalar
+*/
+#define SK_ScalarInfinity       SK_FloatInfinity
+/** SK_ScalarNegativeInfinity is defined to be negative infinity as an SkScalar
+*/
+#define SK_ScalarNegativeInfinity       SK_FloatNegativeInfinity
+/** SK_ScalarMax is defined to be the largest value representable as an SkScalar
+*/
+#define SK_ScalarMax            (3.402823466e+38f)
+/** SK_ScalarMin is defined to be the smallest value representable as an SkScalar
+*/
+#define SK_ScalarMin            (-SK_ScalarMax)
+/** SK_ScalarNaN is defined to be 'Not a Number' as an SkScalar
+*/
+#define SK_ScalarNaN            SK_FloatNaN
+/** SkScalarIsNaN(n) returns true if argument is not a number
+*/
+static inline bool SkScalarIsNaN(float x) { return x != x; }
+/** Returns true if x is not NaN and not infinite */
+static inline bool SkScalarIsFinite(float x) {
+// We rely on the following behavior of infinities and nans
+// 0 * finite --> 0
+// 0 * infinity --> NaN
+// 0 * NaN --> NaN
+float prod = x * 0;
+// At this point, prod will either be NaN or 0
+// Therefore we can return (prod == prod) or (0 == prod).
+return prod == prod;
+}
+/** SkIntToScalar(n) returns its integer argument as an SkScalar
+*/
+#define SkIntToScalar(n)        ((float)(n))
+/** SkFixedToScalar(n) returns its SkFixed argument as an SkScalar
+*/
+#define SkFixedToScalar(x)      SkFixedToFloat(x)
+/** SkScalarToFixed(n) returns its SkScalar argument as an SkFixed
+*/
+#define SkScalarToFixed(x)      SkFloatToFixed(x)
+#define SkScalarToFloat(n)      (n)
+#ifndef SK_SCALAR_TO_FLOAT_EXCLUDED
+#define SkFloatToScalar(n)      (n)
+#endif
+#define SkScalarToDouble(n)      (double)(n)
+#define SkDoubleToScalar(n)      (float)(n)
+/** SkScalarFraction(x) returns the signed fractional part of the argument
+*/
+#define SkScalarFraction(x)     sk_float_mod(x, 1.0f)
+#define SkScalarFloorToScalar(x)    sk_float_floor(x)
+#define SkScalarCeilToScalar(x)     sk_float_ceil(x)
+#define SkScalarRoundToScalar(x)    sk_float_floor((x) + 0.5f)
+#define SkScalarFloorToInt(x)       sk_float_floor2int(x)
+#define SkScalarCeilToInt(x)        sk_float_ceil2int(x)
+#define SkScalarRoundToInt(x)       sk_float_round2int(x)
+#define SkScalarTruncToInt(x)       static_cast<int>(x)
+/** Returns the absolute value of the specified SkScalar
+*/
+#define SkScalarAbs(x)          sk_float_abs(x)
+/** Return x with the sign of y
+*/
+#define SkScalarCopySign(x, y)  sk_float_copysign(x, y)
+/** Returns the value pinned between 0 and max inclusive
+*/
+inline SkScalar SkScalarClampMax(SkScalar x, SkScalar max) {
+return x < 0 ? 0 : x > max ? max : x;
+}
+/** Returns the value pinned between min and max inclusive
+*/
+inline SkScalar SkScalarPin(SkScalar x, SkScalar min, SkScalar max) {
+return x < min ? min : x > max ? max : x;
+}
+/** Returns the specified SkScalar squared (x*x)
+*/
+inline SkScalar SkScalarSquare(SkScalar x) { return x * x; }
+/** Returns the product of two SkScalars
+*/
+#define SkScalarMul(a, b)       ((float)(a) * (b))
+/** Returns the product of two SkScalars plus a third SkScalar
+*/
+#define SkScalarMulAdd(a, b, c) ((float)(a) * (b) + (c))
+/** Returns the quotient of two SkScalars (a/b)
+*/
+#define SkScalarDiv(a, b)       ((float)(a) / (b))
+/** Returns the mod of two SkScalars (a mod b)
+*/
+#define SkScalarMod(x,y)        sk_float_mod(x,y)
+/** Returns the product of the first two arguments, divided by the third argument
+*/
+#define SkScalarMulDiv(a, b, c) ((float)(a) * (b) / (c))
+/** Returns the multiplicative inverse of the SkScalar (1/x)
+*/
+#define SkScalarInvert(x)       (SK_Scalar1 / (x))
+#define SkScalarFastInvert(x)   (SK_Scalar1 / (x))
+/** Returns the square root of the SkScalar
+*/
+#define SkScalarSqrt(x)         sk_float_sqrt(x)
+/** Returns b to the e
+*/
+#define SkScalarPow(b, e)       sk_float_pow(b, e)
+/** Returns the average of two SkScalars (a+b)/2
+*/
+#define SkScalarAve(a, b)       (((a) + (b)) * 0.5f)
+/** Returns one half of the specified SkScalar
+*/
+#define SkScalarHalf(a)         ((a) * 0.5f)
+#define SK_ScalarSqrt2          1.41421356f
+#define SK_ScalarPI             3.14159265f
+#define SK_ScalarTanPIOver8     0.414213562f
+#define SK_ScalarRoot2Over2     0.707106781f
+#define SkDegreesToRadians(degrees) ((degrees) * (SK_ScalarPI / 180))
+#define SkRadiansToDegrees(radians) ((radians) * (180 / SK_ScalarPI))
+float SkScalarSinCos(SkScalar radians, SkScalar* cosValue);
+#define SkScalarSin(radians)    (float)sk_float_sin(radians)
+#define SkScalarCos(radians)    (float)sk_float_cos(radians)
+#define SkScalarTan(radians)    (float)sk_float_tan(radians)
+#define SkScalarASin(val)   (float)sk_float_asin(val)
+#define SkScalarACos(val)   (float)sk_float_acos(val)
+#define SkScalarATan2(y, x) (float)sk_float_atan2(y,x)
+#define SkScalarExp(x)  (float)sk_float_exp(x)
+#define SkScalarLog(x)  (float)sk_float_log(x)
+inline SkScalar SkMaxScalar(SkScalar a, SkScalar b) { return a > b ? a : b; }
+inline SkScalar SkMinScalar(SkScalar a, SkScalar b) { return a < b ? a : b; }
+static inline bool SkScalarIsInt(SkScalar x) {
+return x == (float)(int)x;
+}
+// DEPRECATED : use ToInt or ToScalar variant
+#ifdef SK_SUPPORT_DEPRECATED_SCALARROUND
+#   define SkScalarFloor(x)    SkScalarFloorToInt(x)
+#   define SkScalarCeil(x)     SkScalarCeilToInt(x)
+#   define SkScalarRound(x)    SkScalarRoundToInt(x)
+#endif
+/**
+*  Returns -1 || 0 || 1 depending on the sign of value:
+*  -1 if x < 0
+*   0 if x == 0
+*   1 if x > 0
+*/
+static inline int SkScalarSignAsInt(SkScalar x) {
+return x < 0 ? -1 : (x > 0);
+}
+// Scalar result version of above
+static inline SkScalar SkScalarSignAsScalar(SkScalar x) {
+return x < 0 ? -SK_Scalar1 : ((x > 0) ? SK_Scalar1 : 0);
+}
+#define SK_ScalarNearlyZero         (SK_Scalar1 / (1 << 12))
+static inline bool SkScalarNearlyZero(SkScalar x,
+SkScalar tolerance = SK_ScalarNearlyZero) {
+SkASSERT(tolerance >= 0);
+return SkScalarAbs(x) <= tolerance;
+}
+static inline bool SkScalarNearlyEqual(SkScalar x, SkScalar y,
+SkScalar tolerance = SK_ScalarNearlyZero) {
+SkASSERT(tolerance >= 0);
+return SkScalarAbs(x-y) <= tolerance;
+}
+/** Linearly interpolate between A and B, based on t.
+If t is 0, return A
+If t is 1, return B
+else interpolate.
+t must be [0..SK_Scalar1]
+*/
+static inline SkScalar SkScalarInterp(SkScalar A, SkScalar B, SkScalar t) {
+SkASSERT(t >= 0 && t <= SK_Scalar1);
+return A + (B - A) * t;
+}
+/** Interpolate along the function described by (keys[length], values[length])
+for the passed searchKey.  SearchKeys outside the range keys[0]-keys[Length]
+clamp to the min or max value.  This function was inspired by a desire
+to change the multiplier for thickness in fakeBold; therefore it assumes
+the number of pairs (length) will be small, and a linear search is used.
+Repeated keys are allowed for discontinuous functions (so long as keys is
+monotonically increasing), and if key is the value of a repeated scalar in
+keys, the first one will be used.  However, that may change if a binary
+search is used.
+*/
+SkScalar SkScalarInterpFunc(SkScalar searchKey, const SkScalar keys[],
+const SkScalar values[], int length);
+/*
+*  Helper to compare an array of scalars.
+*/
+static inline bool SkScalarsEqual(const SkScalar a[], const SkScalar b[], int n) {
+SkASSERT(n >= 0);
+for (int i = 0; i < n; ++i) {
+if (a[i] != b[i]) {
+return false;
+}
+}
+return true;
+}
+#endif

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comparison: gfx/skia/trunk/include/core/SkScalar.h

gfx/skia/trunk/include/core/SkScalar.h