Reland of path ops: fix conic weight and partial coincidence

tests/PathOpsTSectDebug.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPathOpsTSect.h"
 
 template<typename TCurve, typename OppCurve>
+char SkTCoincident<TCurve, OppCurve>::dumpIsCoincidentStr() const {
+    if (!!fCoincident != fCoincident) {
+        return '?';
+    }
+    return fCoincident ? '*' : 0;
+}
+
+template<typename TCurve, typename OppCurve>
 void SkTCoincident<TCurve, OppCurve>::dump() const {
     SkDebugf("t=%1.9g pt=(%1.9g,%1.9g)%s\n", fPerpT, fPerpPt.fX, fPerpPt.fY,
             fCoincident ? " coincident" : "");
 }
 
 template<typename TCurve, typename OppCurve>
 const SkTSpan<TCurve, OppCurve>* SkTSect<TCurve, OppCurve>::debugSpan(int id) const {
     const SkTSpan<TCurve, OppCurve>* test = fHead;
     do {
         if (test->debugID() == id) {
@@ skipping 173 matching lines @@
 void SkTSpan<TCurve, OppCurve>::dumpCoin() const {
     dumpID();
     SkDebugf(" coinStart ");
     fCoinStart.dump();
     SkDebugf(" coinEnd ");
     fCoinEnd.dump();
 }
 
 template<typename TCurve, typename OppCurve>
 void SkTSpan<TCurve, OppCurve>::dumpID() const {
-    if (fCoinStart.isCoincident()) {
-        SkDebugf("%c", '*');
+    char cS = fCoinStart.dumpIsCoincidentStr();
+    if (cS) {
+        SkDebugf("%c", cS);
     }
     SkDebugf("%d", debugID());
-    if (fCoinEnd.isCoincident()) {
-        SkDebugf("%c", '*');
+    char cE = fCoinEnd.dumpIsCoincidentStr();
+    if (cE) {
+        SkDebugf("%c", cE);
     }
 }