quad and conic do not intersect

If a quad a conic intersect only where the end of one
is contained by the convex hull of the other, and the
curve contained by the hull is nearly a straight line,
treating it as a line may move the end point to the
other side of the curve.

Detect this by checking to see if the end point is in
the hull, and if so, continue to subdivide the curve
rather than treating it as a line.

This fixes several existing tests that were disabled
earlier this year.

A typo in SkDCurve::nearPoint() prevented detecting when
the end of a line was nearly touching a curve.

Also fixed concidence a bit to get the second half of
tiger further along.

All existing tests, including extended testing in
Release and the first half of tiger, work.

TBR=reed@google.com
BUG=skia:5131
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2338323002

Review-Url: https://codereview.chromium.org/2338323002

1 files changed, 3 insertions, 5 deletions

diff --git a/tests/PathOpsFuzz763Test.cpp b/tests/PathOpsFuzz763Test.cpp
index ba0aa056fd..ecbada2a22 100755
--- a/tests/PathOpsFuzz763Test.cpp
+++ b/tests/PathOpsFuzz763Test.cpp
@@ -454,8 +454,7 @@ path.quadTo(SkBits2Float(0xc2382594), SkBits2Float(0x41a85c76), SkBits2Float(0xc
 path.close();
 
     SkPath path2(path);
-// DEBUG_UNDER_DEVELOPMENT  fuzz763_378a disable expectation check for now
-    testPathOpCheck(reporter, path1, path2, (SkPathOp) 2, filename, !FLAGS_runFail);
+    testPathOp(reporter, path1, path2, (SkPathOp) 2, filename);
 }
 
 
@@ -496,7 +495,7 @@ path.quadTo(SkBits2Float(0xc2382594), SkBits2Float(0x41a85c76), SkBits2Float(0xc
 path.close();
 
     SkPath path2(path);
-    testPathOpCheck(reporter, path1, path2, (SkPathOp) 2, filename, !FLAGS_runFail);
+    testPathOp(reporter, path1, path2, (SkPathOp) 2, filename);
 }
 
 static void fuzz763_8712(skiatest::Reporter* reporter, const char* filename) {
@@ -933,8 +932,7 @@ path.quadTo(SkBits2Float(0x42240000), SkBits2Float(0x41ed7d86), SkBits2Float(0x4
 path.close();
 
     SkPath path2(path);
-// DEBUG_UNDER_DEVELOPMENT  fuzz763_4713 disable expectation check for now
-    testPathOpCheck(reporter, path1, path2, (SkPathOp) 2, filename, !FLAGS_runFail);
+    testPathOp(reporter, path1, path2, (SkPathOp) 2, filename);
 }
 
 static void fuzz763_24588(skiatest::Reporter* reporter, const char* filename) {