Initialize the result in failure conditions of ChopMonoAtY.

src/core/SkPath.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBuffer.h"
 #include "SkCubicClipper.h"
 #include "SkErrorInternals.h"
@@ skipping 2782 matching lines @@
     find_minmax<4>(pts, &min, &max);
     if (x < min) {
         return 0;
     }
     if (x > max) {
         return dir;
     }
 
     // compute the actual x(t) value
     SkScalar t;
-    SkAssertResult(SkCubicClipper::ChopMonoAtY(pts, y, &t));
+    if (!SkCubicClipper::ChopMonoAtY(pts, y, &t)) {
+      return 0;
+    }
     SkScalar xt = eval_cubic_pts(pts[0].fX, pts[1].fX, pts[2].fX, pts[3].fX, t);
     if (SkScalarNearlyEqual(xt, x)) {
         if (x != pts[3].fX || y != pts[3].fY) {  // don't test end points; they're start points
             *onCurveCount += 1;
             return 0;
         }
     }
     return xt < x ? dir : 0;
 }
 
@@ skipping 216 matching lines @@
     }
     if (!between(pts[0].fX, x, pts[1].fX) && !between(pts[1].fX, x, pts[2].fX)
              && !between(pts[2].fX, x, pts[3].fX)) {
         return;
     }
     SkPoint dst[10];
     int n = SkChopCubicAtYExtrema(pts, dst);
     for (int i = 0; i <= n; ++i) {
         SkPoint* c = &dst[i * 3];
         SkScalar t;
-        SkAssertResult(SkCubicClipper::ChopMonoAtY(c, y, &t));
+        if (!SkCubicClipper::ChopMonoAtY(c, y, &t)) {
+          continue;
+        }
         SkScalar xt = eval_cubic_pts(c[0].fX, c[1].fX, c[2].fX, c[3].fX, t);
         if (!SkScalarNearlyEqual(x, xt)) {
             continue;
         }
         SkVector tangent;
         SkEvalCubicAt(c, t, nullptr, &tangent, nullptr);
         tangents->push(tangent);
     }
 }
 
@@ skipping 175 matching lines @@
         }
     } while (!done);
     return SkToBool(tangents.count()) ^ isInverse;
 }
 
 int SkPath::ConvertConicToQuads(const SkPoint& p0, const SkPoint& p1, const SkPoint& p2,
                                 SkScalar w, SkPoint pts[], int pow2) {
     const SkConic conic(p0, p1, p2, w);
     return conic.chopIntoQuadsPOW2(pts, pow2);
 }