path ops -- rewrite angle sort

src/pathops/SkIntersections.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkIntersections.h"
 
 int (SkIntersections::*CurveVertical[])(const SkPoint[], SkScalar, SkScalar, SkScalar, bool) = {
     NULL,
     &SkIntersections::verticalLine,
     &SkIntersections::verticalQuad,
     &SkIntersections::verticalCubic
 };
 
 int (SkIntersections::*CurveRay[])(const SkPoint[], const SkDLine&) = {
     NULL,
     NULL,
     &SkIntersections::quadRay,
     &SkIntersections::cubicRay
 };
 
 int SkIntersections::coincidentUsed() const {
     if (!fIsCoincident[0]) {
-        SkASSERT(!fIsCoincident[0]);
+        SkASSERT(!fIsCoincident[1]);
         return 0;
     }
     int count = 0;
     SkDEBUGCODE(int count2 = 0;)
     for (int index = 0; index < fUsed; ++index) {
         if (fIsCoincident[0] & (1 << index)) {
             ++count;
         }
 #ifdef SK_DEBUG
         if (fIsCoincident[1] & (1 << index)) {
@@ skipping 219 matching lines @@
     quad.set(a);
     return vertical(quad, top, bottom, x, flipped);
 }
 
 int SkIntersections::verticalCubic(const SkPoint a[4], SkScalar top, SkScalar bottom,
         SkScalar x, bool flipped) {
     SkDCubic cubic;
     cubic.set(a);
     return vertical(cubic, top, bottom, x, flipped);
 }