pathops coincident fixes

src/pathops/SkOpSpan.cpp

Index: src/pathops/SkOpSpan.cpp
diff --git a/src/pathops/SkOpSpan.cpp b/src/pathops/SkOpSpan.cpp
index ae4771cffc01ee15cfe4ce65b5bea8d4cd7fdc29..f5a52099da4be84f9d9a71ce7cb37b48637eeccd 100755
--- a/src/pathops/SkOpSpan.cpp
+++ b/src/pathops/SkOpSpan.cpp
@@ -13,10 +13,64 @@ bool SkOpPtT::alias() const {
     return this->span()->ptT() != this;
 }
 
+bool SkOpPtT::contains(const SkOpPtT* check) const {
+    SkASSERT(this != check);
+    const SkOpPtT* ptT = this;
+    const SkOpPtT* stopPtT = ptT;
+    while ((ptT = ptT->next()) != stopPtT) {
+        if (ptT == check) {
+            return true;
+        }
+    }
+    return false;
+}
+
+SkOpPtT* SkOpPtT::contains(const SkOpSegment* check) {
+    SkASSERT(this->segment() != check);
+    SkOpPtT* ptT = this;
+    const SkOpPtT* stopPtT = ptT;
+    while ((ptT = ptT->next()) != stopPtT) {
+        if (ptT->segment() == check) {
+            return ptT;
+        }
+    }
+    return NULL;
+}
+
 SkOpContour* SkOpPtT::contour() const {
     return segment()->contour();
 }
 
+SkOpPtT* SkOpPtT::doppelganger() {
+    SkASSERT(fDeleted);
+    SkOpPtT* ptT = fNext;
+    while (ptT->fDeleted) {
+        ptT = ptT->fNext;
+    }
+    const SkOpPtT* stopPtT = ptT;
+    do {
+        if (ptT->fSpan == fSpan) {
+            return ptT;
+        }
+        ptT = ptT->fNext;
+    } while (stopPtT != ptT);
+    SkASSERT(0);
+    return NULL;
+}
+
+SkOpPtT* SkOpPtT::find(SkOpSegment* segment) {
+    SkOpPtT* ptT = this;
+    const SkOpPtT* stopPtT = ptT;
+    do {
+        if (ptT->segment() == segment) {
+            return ptT;
+        }
+        ptT = ptT->fNext;
+    } while (stopPtT != ptT);
+    SkASSERT(0);
+    return NULL;
+}
+
 SkOpGlobalState* SkOpPtT::globalState() const {
     return contour()->globalState(); 
 }