working on initial winding for cubics

Path ops works well for all tests except for cubics.
Isolate failures caused by cubics, and do a better job of computing
the initial winding for cubics.

TBR=reed@google.com
BUG=skia:3588

Review URL: https://codereview.chromium.org/1096923003

1 files changed, 14 insertions, 0 deletions

diff --git a/src/pathops/SkPathOpsPoint.h b/src/pathops/SkPathOpsPoint.h
index 35ad80ea4c..c596b91cc0 100644
--- a/src/pathops/SkPathOpsPoint.h
+++ b/src/pathops/SkPathOpsPoint.h
@@ -115,6 +115,20 @@ struct SkDPoint {
         fY -= v.fY;
     }
 
+    // only used by testing
+    SkDPoint operator+(const SkDVector& v) {
+        SkDPoint result = *this;
+        result += v;
+        return result;
+    }
+
+    // only used by testing
+    SkDPoint operator-(const SkDVector& v) {
+        SkDPoint result = *this;
+        result -= v;
+        return result;
+    }
+
     // note: this can not be implemented with
     // return approximately_equal(a.fY, fY) && approximately_equal(a.fX, fX);
     // because that will not take the magnitude of the values into account