allow conic chop to fail

src/gpu/batches/GrAAHairLinePathRenderer.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrAAHairLinePathRenderer.h"
 
 #include "GrBatchFlushState.h"
@@ skipping 127 matching lines @@
     SkScalar t = SkFindQuadMaxCurvature(src);
     if (t == 0) {
         if (dst) {
             dst[0].set(src, weight);
         }
         return 1;
     } else {
         if (dst) {
             SkConic conic;
             conic.set(src, weight);
-            conic.chopAt(t, dst);
+            if (!conic.chopAt(t, dst)) {
+                dst[0].set(src, weight);
+                return 1;
+            }
         }
         return 2;
     }
 }
 
 // Calls split_conic on the entire conic and then once more on each subsection.
 // Most cases will result in either 1 conic (chop point is not within t range)
 // or 3 points (split once and then one subsection is split again).
 static int chop_conic(const SkPoint src[3], SkConic dst[4], const SkScalar weight) {
     SkConic dstTemp[2];
@@ skipping 822 matching lines @@
 DRAW_BATCH_TEST_DEFINE(AAHairlineBatch) {
     GrColor color = GrRandomColor(random);
     SkMatrix viewMatrix = GrTest::TestMatrix(random);
     SkPath path = GrTest::TestPath(random);
     SkIRect devClipBounds;
     devClipBounds.setEmpty();
     return create_hairline_batch(color, viewMatrix, path, GrStyle::SimpleHairline(), devClipBounds);
 }
 
 #endif