fix minor skp-found bugs

src/pathops/SkDCubicIntersection.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkIntersections.h"
 #include "SkPathOpsCubic.h"
 #include "SkPathOpsLine.h"
@@ skipping 476 matching lines @@
         SkASSERT(!selfIntersect);
         return fUsed;
     }
     // FIXME: pass in cached bounds from caller
     SkDRect c2Bounds;
     c2Bounds.setBounds(c2);
     if (!(exactEndBits & 4)) {
         cubicNearEnd(c1, false, c2, c2Bounds);
     }
     if (!(exactEndBits & 8)) {
+        if (selfIntersect && fUsed) {
+            return fUsed;
+        }
         cubicNearEnd(c1, true, c2, c2Bounds);
+        if (selfIntersect && fUsed && ((approximately_less_than_zero(fT[0][0])
+                    && approximately_less_than_zero(fT[1][0]))
+                    || (approximately_greater_than_one(fT[0][0])
+                    && approximately_greater_than_one(fT[1][0])))) {
+            SkASSERT(fUsed == 1);
+            fUsed = 0;
+            return fUsed;
+        }
     }
     if (!selfIntersect) {
         SkDRect c1Bounds;
         c1Bounds.setBounds(c1);  // OPTIMIZE use setRawBounds ?
         swap();
         if (!(exactEndBits & 1)) {
             cubicNearEnd(c2, false, c1, c1Bounds);
         }
         if (!(exactEndBits & 2)) {
             cubicNearEnd(c2, true, c1, c1Bounds);
@@ skipping 133 matching lines @@
     }
     (void) intersect(c, c);
     if (used() > 0) {
         SkASSERT(used() == 1);
         if (fT[0][0] > fT[1][0]) {
             swapPts();
         }
     }
     return used();
 }