constexpr NaN,+Inf,-Inf

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
@@ skipping 82 matching lines @@
     #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))
+static const uint32_t kIEEENotANumber = 0x7fffffff;
+#define SK_FloatNaN                 (*SkTCast<const float*>(&kIEEENotANumber))
+#define SK_FloatInfinity            (+(float)INFINITY)
+#define SK_FloatNegativeInfinity    (-(float)INFINITY)
 
 static inline float sk_float_rsqrt_portable(float x) {
     // Get initial estimate.
     int i = *SkTCast<int*>(&x);
     i = 0x5F1FFFF9 - (i>>1);
     float estimate = *SkTCast<float*>(&i);
 
     // One step of Newton's method to refine.
     const float estimate_sq = estimate*estimate;
     estimate *= 0.703952253f*(2.38924456f-x*estimate_sq);
@@ skipping 29 matching lines @@
 // 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