Revert[3] "move some public headers into private"

include/private/SkFloatingPoint.h

-
-/*
- * 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 SkFloatingPoint_DEFINED
-#define SkFloatingPoint_DEFINED
-
-#include "SkTypes.h"
-
-#include <math.h>
-#include <float.h>
-
-// For _POSIX_VERSION
-#if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
-#include <unistd.h>
-#endif
-
-#include "SkFloatBits.h"
-
-// C++98 cmath std::pow seems to be the earliest portable way to get float pow.
-// However, on Linux including cmath undefines isfinite.
-// http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14608
-static inline float sk_float_pow(float base, float exp) {
-    return powf(base, exp);
-}
-
-static inline float sk_float_copysign(float x, float y) {
-// c++11 contains a 'float copysign(float, float)' function in <cmath>.
-// clang-cl reports __cplusplus for clang, not the __cplusplus vc++ version _MSC_VER would report.
-#if (defined(_MSC_VER) && defined(__clang__))
-#    define SK_BUILD_WITH_CLANG_CL 1
-#else
-#    define SK_BUILD_WITH_CLANG_CL 0
-#endif
-#if (!SK_BUILD_WITH_CLANG_CL && __cplusplus >= 201103L) || (_MSC_VER >= 1800)
-    return copysignf(x, y);
-
-// Posix has demanded 'float copysignf(float, float)' (from C99) since Issue 6.
-#elif defined(_POSIX_VERSION) && _POSIX_VERSION >= 200112L
-    return copysignf(x, y);
-
-// Visual studio prior to 13 only has 'double _copysign(double, double)'.
-#elif defined(_MSC_VER)
-    return (float)_copysign(x, y);
-
-// Otherwise convert to bits and extract sign.
-#else
-    int32_t xbits = SkFloat2Bits(x);
-    int32_t ybits = SkFloat2Bits(y);
-    return SkBits2Float((xbits & 0x7FFFFFFF) | (ybits & 0x80000000));
-#endif
-}
-
-#define sk_float_sqrt(x)        sqrtf(x)
-#define sk_float_sin(x)         sinf(x)
-#define sk_float_cos(x)         cosf(x)
-#define sk_float_tan(x)         tanf(x)
-#define sk_float_floor(x)       floorf(x)
-#define sk_float_ceil(x)        ceilf(x)
-#ifdef SK_BUILD_FOR_MAC
-#    define sk_float_acos(x)    static_cast<float>(acos(x))
-#    define sk_float_asin(x)    static_cast<float>(asin(x))
-#else
-#    define sk_float_acos(x)    acosf(x)
-#    define sk_float_asin(x)    asinf(x)
-#endif
-#define sk_float_atan2(y,x)     atan2f(y,x)
-#define sk_float_abs(x)         fabsf(x)
-#define sk_float_mod(x,y)       fmodf(x,y)
-#define sk_float_exp(x)         expf(x)
-#define sk_float_log(x)         logf(x)
-
-#define sk_float_round(x) sk_float_floor((x) + 0.5f)
-
-// can't find log2f on android, but maybe that just a tool bug?
-#ifdef SK_BUILD_FOR_ANDROID
-    static inline float sk_float_log2(float x) {
-        const double inv_ln_2 = 1.44269504088896;
-        return (float)(log(x) * inv_ln_2);
-    }
-#else
-    #define sk_float_log2(x)        log2f(x)
-#endif
-
-#ifdef SK_BUILD_FOR_WIN
-    #define sk_float_isfinite(x)    _finite(x)
-    #define sk_float_isnan(x)       _isnan(x)
-    static inline int sk_float_isinf(float x) {
-        int32_t bits = SkFloat2Bits(x);
-        return (bits << 1) == (0xFF << 24);
-    }
-#else
-    #define sk_float_isfinite(x)    isfinite(x)
-    #define sk_float_isnan(x)       isnan(x)
-    #define sk_float_isinf(x)       isinf(x)
-#endif
-
-#define sk_double_isnan(a)          sk_float_isnan(a)
-
-#ifdef SK_USE_FLOATBITS
-    #define sk_float_floor2int(x)   SkFloatToIntFloor(x)
-    #define sk_float_round2int(x)   SkFloatToIntRound(x)
-    #define sk_float_ceil2int(x)    SkFloatToIntCeil(x)
-#else
-    #define sk_float_floor2int(x)   (int)sk_float_floor(x)
-    #define sk_float_round2int(x)   (int)sk_float_floor((x) + 0.5f)
-    #define sk_float_ceil2int(x)    (int)sk_float_ceil(x)
-#endif
-
-#define sk_double_floor(x)          floor(x)
-#define sk_double_round(x)          floor((x) + 0.5)
-#define sk_double_ceil(x)           ceil(x)
-#define sk_double_floor2int(x)      (int)floor(x)
-#define sk_double_round2int(x)      (int)floor((x) + 0.5f)
-#define sk_double_ceil2int(x)       (int)ceil(x)
-
-extern const uint32_t gIEEENotANumber;
-extern const uint32_t gIEEEInfinity;
-extern const uint32_t gIEEENegativeInfinity;
-
-#define SK_FloatNaN                 (*SkTCast<const float*>(&gIEEENotANumber))
-#define SK_FloatInfinity            (*SkTCast<const float*>(&gIEEEInfinity))
-#define SK_FloatNegativeInfinity    (*SkTCast<const float*>(&gIEEENegativeInfinity))
-
-// We forward declare this to break an #include cycle.
-// (SkScalar -> SkFloatingPoint -> SkOpts.h -> SkXfermode -> SkColor -> SkScalar)
-namespace SkOpts { extern float (*rsqrt)(float); }
-
-// Fast, approximate inverse square root.
-// Compare to name-brand "1.0f / sk_float_sqrt(x)".  Should be around 10x faster on SSE, 2x on NEON.
-static inline float sk_float_rsqrt(const float x) {
-// We want all this inlined, so we'll inline SIMD and just take the hit when we don't know we've got
-// it at compile time.  This is going to be too fast to productively hide behind a function pointer.
-//
-// We do one step of Newton's method to refine the estimates in the NEON and null paths.  No
-// refinement is faster, but very innacurate.  Two steps is more accurate, but slower than 1/sqrt.
-//
-// Optimized constants in the null path courtesy of http://rrrola.wz.cz/inv_sqrt.html
-#if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE1
-    return _mm_cvtss_f32(_mm_rsqrt_ss(_mm_set_ss(x)));
-#elif defined(SK_ARM_HAS_NEON)
-    // Get initial estimate.
-    const float32x2_t xx = vdup_n_f32(x);  // Clever readers will note we're doing everything 2x.
-    float32x2_t estimate = vrsqrte_f32(xx);
-
-    // One step of Newton's method to refine.
-    const float32x2_t estimate_sq = vmul_f32(estimate, estimate);
-    estimate = vmul_f32(estimate, vrsqrts_f32(xx, estimate_sq));
-    return vget_lane_f32(estimate, 0);  // 1 will work fine too; the answer's in both places.
-#else
-    // Perhaps runtime-detected NEON, or a portable fallback.
-    return SkOpts::rsqrt(x);
-#endif
-}
-
-// This is the number of significant digits we can print in a string such that when we read that
-// string back we get the floating point number we expect.  The minimum value C requires is 6, but
-// most compilers support 9
-#ifdef FLT_DECIMAL_DIG
-#define SK_FLT_DECIMAL_DIG FLT_DECIMAL_DIG
-#else
-#define SK_FLT_DECIMAL_DIG 9
-#endif
-
-#endif