path ops: check for deleted ends

src/pathops/SkOpCoincidence.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SkOpCoincidence.h"
 #include "SkOpSegment.h"
 #include "SkPathOpsTSect.h"
 
@@ skipping 372 matching lines @@
         SkOpSpan* oStart = (flipped ? coin->fOppPtTEnd : coin->fOppPtTStart)->span()->upCast();
         if (oStart->deleted()) {
             continue;
         }
         SkOpSpanBase* oEnd = (flipped ? coin->fOppPtTStart : coin->fOppPtTEnd)->span();
         SkASSERT(oStart == oStart->starter(oEnd));
         SkOpSegment* segment = start->segment();
         SkOpSegment* oSegment = oStart->segment();
         bool operandSwap = segment->operand() != oSegment->operand();
         if (flipped) {
+            if (oEnd->deleted()) {
+                continue;
+            }
             do {
                 SkOpSpanBase* oNext = oStart->next();
                 if (oNext == oEnd) {
                     break;
                 }
                 oStart = oNext->upCast();
             } while (true);
         }
         do {
             int windValue = start->windValue();
@@ skipping 270 matching lines @@
     *overS = SkTMax(SkTMin(coin1s->fT, coin1e->fT), SkTMin(coin2s->fT, coin2e->fT));
     *overE = SkTMin(SkTMax(coin1s->fT, coin1e->fT), SkTMax(coin2s->fT, coin2e->fT));
     return *overS < *overE;
 }
 
 bool SkOpCoincidence::testForCoincidence(const SkCoincidentSpans* outer, const SkOpPtT* testS,
         const SkOpPtT* testE) const {
     return testS->segment()->testForCoincidence(testS, testE, testS->span(),
             testE->span(), outer->fCoinPtTStart->segment(), 120000);  // FIXME: replace with tuned
 }