compute initial winding from projected rays

src/pathops/SkPathOpsPoint.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef SkPathOpsPoint_DEFINED
 #define SkPathOpsPoint_DEFINED
 
 #include "SkPathOpsTypes.h"
 #include "SkPoint.h"
 
 inline bool AlmostEqualUlps(const SkPoint& pt1, const SkPoint& pt2) {
     return AlmostEqualUlps(pt1.fX, pt2.fX) && AlmostEqualUlps(pt1.fY, pt2.fY);
 }
 
 struct SkDVector {
     double fX;
     double fY;
 
     void set(const SkVector& pt) {
         fX = pt.fX;
         fY = pt.fY;
     }
 
-    friend SkDPoint operator+(const SkDPoint& a, const SkDVector& b);
-
     // only used by testing
     void operator+=(const SkDVector& v) {
         fX += v.fX;
         fY += v.fY;
     }
 
     // only called by nearestT, which is currently only used by testing
     void operator-=(const SkDVector& v) {
         fX -= v.fX;
         fY -= v.fY;
@@ skipping 163 matching lines @@
             return true;
         }
         double dist = distance(a);  // OPTIMIZATION: can we compare against distSq instead ?
         double tiniest = SkTMin(SkTMin(SkTMin(fX, a.fX), fY), a.fY);
         double largest = SkTMax(SkTMax(SkTMax(fX, a.fX), fY), a.fY);
         largest = SkTMax(largest, -tiniest);
         return RoughlyEqualUlps(largest, largest + dist); // is the dist within ULPS tolerance?
     }
 
     static bool RoughlyEqual(const SkPoint& a, const SkPoint& b) {
-        if (!RoughlyEqualUlps(a.fX, b.fX) || !RoughlyEqualUlps(a.fY, b.fY)) {
+        if (!RoughlyEqualUlps(a.fX, b.fX) && !RoughlyEqualUlps(a.fY, b.fY)) {
             return false;
         }
         SkDPoint dA, dB;
         dA.set(a);
         dB.set(b);
         double dist = dA.distance(dB);  // OPTIMIZATION: can we compare against distSq instead ?
         float tiniest = SkTMin(SkTMin(SkTMin(a.fX, b.fX), a.fY), b.fY);
         float largest = SkTMax(SkTMax(SkTMax(a.fX, b.fX), a.fY), b.fY);
         largest = SkTMax(largest, -tiniest);
         return RoughlyEqualUlps((double) largest, largest + dist); // is dist within ULPS tolerance?
     }
 
     // utilities callable by the user from the debugger when the implementation code is linked in
     void dump() const;
     static void Dump(const SkPoint& pt);
     static void DumpHex(const SkPoint& pt);
 };
 
 #endif