path ops: fix fuzz-found divide by zero

tests/PathOpsOpTest.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 "PathOpsExtendedTest.h"
 #include "PathOpsTestCommon.h"
 
 class PathTest_Private {
@@ skipping 5737 matching lines @@
 path.close();
 
     SkPath path1(path);
     path.reset();
     path.setFillType((SkPath::FillType) 0);
 
     SkPath path2(path);
     testPathFailOp(reporter, path1, path2, (SkPathOp) 2, filename);
 }
 
+
+static void fuzz753_91(skiatest::Reporter* reporter, const char* filename) {
+    SkPath path;
+    path.setFillType((SkPath::FillType) 0);
+path.moveTo(SkBits2Float(0x42910000), SkBits2Float(0x00000000));  // 72.5f, 0
+path.lineTo(SkBits2Float(0x42166668), SkBits2Float(0x00000000));  // 37.6f, 0
+path.cubicTo(SkBits2Float(0x42166668), SkBits2Float(0xc1966668), SkBits2Float(0x41c66668), SkBits2Float(0xc20a6666), SkBits2Float(0x40f00010), SkBits2Float(0xc21ccccd));  // 37.6f, -18.8f, 24.8f, -34.6f, 7.50001f, -39.2f
+path.lineTo(SkBits2Float(0x41840004), SkBits2Float(0xc291cccd));  // 16.5f, -72.9f
+path.lineTo(SkBits2Float(0x42fb6668), SkBits2Float(0x42c73334));  // 125.7f, 99.6f
+path.lineTo(SkBits2Float(0x43646668), SkBits2Float(0x43880ccd));  // 228.4f, 272.1f
+
+    SkPath path1(path);
+    path.reset();
+    path.setFillType((SkPath::FillType) 0);
+path.moveTo(SkBits2Float(0x428bf702), SkBits2Float(0xcf223cbf));  // 69.9824f, -2.72189e+09f
+path.lineTo(SkBits2Float(0x42112d68), SkBits2Float(0xcf223cbf));  // 36.2943f, -2.72189e+09f
+path.cubicTo(SkBits2Float(0x4220d9fc), SkBits2Float(0xcf223cc0), SkBits2Float(0x420ee118), SkBits2Float(0xcf223cc0), SkBits2Float(0x41cef2f8), SkBits2Float(0xcf223cc0));  // 40.2129f, -2.72189e+09f, 35.7198f, -2.72189e+09f, 25.8686f, -2.72189e+09f
+path.lineTo(SkBits2Float(0x424a99e0), SkBits2Float(0xcf223cc0));  // 50.6503f, -2.72189e+09f
+path.cubicTo(SkBits2Float(0x42266e32), SkBits2Float(0xcf223cc0), SkBits2Float(0x41f0fa20), SkBits2Float(0xcf223cc0), SkBits2Float(0x41872ed4), SkBits2Float(0xcf223cc0));  // 41.6076f, -2.72189e+09f, 30.1221f, -2.72189e+09f, 16.8979f, -2.72189e+09f
+path.lineTo(SkBits2Float(0x40f8fbe0), SkBits2Float(0xcf223cc0));  // 7.78075f, -2.72189e+09f
+
+    SkPath path2(path);
+    testPathFailOp(reporter, path1, path2, (SkPathOp) 2, filename);
+}
+
 static struct TestDesc failTests[] = {
+    TEST(fuzz753_91),
     TEST(fuzz714),
     TEST(fuzz487a),
     TEST(fuzz433),
     TEST(fuzz1),
     TEST(fuzz487b),
     TEST(fuzz433b),
     TEST(bufferOverflow),
 };
 
 static const size_t failTestCount = SK_ARRAY_COUNT(failTests);
 
 DEF_TEST(PathOpsFailOp, reporter) {
 #if DEBUG_SHOW_TEST_NAME
     strncpy(DEBUG_FILENAME_STRING, "", DEBUG_FILENAME_STRING_LENGTH);
 #endif
     RunTestSet(reporter, failTests, failTestCount, nullptr, nullptr, nullptr, false);
 }