These tests stress pathops by describing the union of circle-like paths that have tiny line segments embedded and double back to create near-coincident conditions.

The fixes include
- detect when finding the active top loops between two possible answers
- preflight chasing winding to ensure answer is consistent
- binary search more often when quadratic intersection fails
- add more failure paths when an intersect is missed

While this fixes the chrome bug, reenabling path ops in svg should be deferred until additional fixes are landed.

TBR=
BUG=421132

Review URL: https://codereview.chromium.org/633393002

1 files changed, 8 insertions, 0 deletions

diff --git a/src/pathops/SkOpAngle.h b/src/pathops/SkOpAngle.h
index 098c470128..1dc4250613 100644
--- a/src/pathops/SkOpAngle.h
+++ b/src/pathops/SkOpAngle.h
@@ -50,6 +50,14 @@ public:
 
     SkOpAngle* previous() const;
 
+    int sectorEnd() const {
+        return fSectorEnd;
+    }
+
+    int sectorStart() const {
+        return fSectorStart;
+    }
+
     void set(const SkOpSegment* segment, int start, int end);
 
     void setLastMarked(SkOpSpan* marked) {