add asserts to point<-->verb helpers

include/core/SkGeometry.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 SkGeometry_DEFINED
@@ skipping 212 matching lines @@
      *  tangent value's length is arbitrary, and only its direction should
      *  be used.
      */
     void evalAt(SkScalar t, SkPoint* pos, SkVector* tangent = NULL) const;
     void chopAt(SkScalar t, SkConic dst[2]) const;
     void chop(SkConic dst[2]) const;
 
     void computeAsQuadError(SkVector* err) const;
     bool asQuadTol(SkScalar tol) const;
 
+    /**
+     *  return the power-of-2 number of quads needed to approximate this conic
+     *  with a sequence of quads. Will be >= 0.
+     */
     int computeQuadPOW2(SkScalar tol) const;
+
+    /**
+     *  Chop this conic into N quads, stored continguously in pts[], where
+     *  N = 1 << pow2. The amount of storage needed is (1 + 2 * N)
+     */
     int chopIntoQuadsPOW2(SkPoint pts[], int pow2) const;
 
     bool findXExtrema(SkScalar* t) const;
     bool findYExtrema(SkScalar* t) const;
     bool chopAtXExtrema(SkConic dst[2]) const;
     bool chopAtYExtrema(SkConic dst[2]) const;
 
     void computeTightBounds(SkRect* bounds) const;
     void computeFastBounds(SkRect* bounds) const;
 };
 
 #endif