Glyph positions maintain 32 bit integer part.

include/core/SkFixed.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 SkFixed_DEFINED
 #define SkFixed_DEFINED
 
@@ skipping 132 matching lines @@
 typedef int64_t SkFixed3232;   // 32.32
 
 #define SkIntToFixed3232(x)       ((SkFixed3232)(x) << 32)
 #define SkFixed3232ToInt(x)       ((int)((x) >> 32))
 #define SkFixedToFixed3232(x)     ((SkFixed3232)(x) << 16)
 #define SkFixed3232ToFixed(x)     ((SkFixed)((x) >> 16))
 #define SkFloatToFixed3232(x)     ((SkFixed3232)((x) * (65536.0f * 65536.0f)))
 
 #define SkScalarToFixed3232(x)    SkFloatToFixed3232(x)
 
+///////////////////////////////////////////////////////////////////////////////
+
+// 64bits wide, with a 16bit bias. Useful when accumulating lots of 16.16 so
+// we don't overflow along the way
+typedef int64_t Sk48Dot16;
+
+#define Sk48Dot16FloorToInt(x)    static_cast<int>((x) >> 16)
+
+static inline float Sk48Dot16ToScalar(Sk48Dot16 x) {
+    return static_cast<float>(x * 1.5258789e-5);  // x * (1.0f / (1 << 16))
+}
+#define SkFloatTo48Dot16(x)       (static_cast<Sk48Dot16>((x) * (1 << 16)))
+
+#define SkScalarTo48Dot16(x)      SkFloatTo48Dot16(x)
+
 #endif