Fleshed out a lot of the Path interfac

include/core/SkScalar.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 SkScalar_DEFINED
 #define SkScalar_DEFINED
 
@@ skipping 122 matching lines @@
 /** 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)
 
@@ skipping 71 matching lines @@
     SkASSERT(n >= 0);
     for (int i = 0; i < n; ++i) {
         if (a[i] != b[i]) {
             return false;
         }
     }
     return true;
 }
 
 #endif