constexpr NaN,+Inf,-Inf

src/core/SkLiteDL.cpp

Index: src/core/SkLiteDL.cpp
diff --git a/src/core/SkLiteDL.cpp b/src/core/SkLiteDL.cpp
index 4557b375a864cc39a0a2f90488b0fec1b4970f0d..c6a3a8e8ea47feaff82e570a4802feea3eeed12a 100644
--- a/src/core/SkLiteDL.cpp
+++ b/src/core/SkLiteDL.cpp
@@ -14,12 +14,11 @@
 #include "SkRSXform.h"
 #include "SkSpinlock.h"
 #include "SkTextBlob.h"
-#include <math.h>
 
 // A stand-in for an optional SkRect which was not set, e.g. bounds for a saveLayer().
-static const SkRect kUnset = {(SkScalar)INFINITY, 0,0,0};
+static const SkRect kUnset = { SK_ScalarInfinity, 0,0,0};
 static const SkRect* maybe_unset(const SkRect& r) {
-    return r.left() == (SkScalar)INFINITY ? nullptr : &r;
+    return r.left() == SK_ScalarInfinity ? nullptr : &r;
 }
 
 // copy_v(dst, src,n, src,n, ...) copies an arbitrary number of typed srcs into dst.