compare degenerates with tolerance

tests/PathTest.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 <cmath>
 #include "SkCanvas.h"
 #include "SkGeometry.h"
@@ skipping 120 matching lines @@
     SkPath path;
     path.moveTo(SkBits2Float(0x47452a00), SkBits2Float(0x43211d01));  // 50474, 161.113f
     path.conicTo(SkBits2Float(0x401c0000), SkBits2Float(0x40680000),
         SkBits2Float(0x02c25a81), SkBits2Float(0x981a1fa0),
         SkBits2Float(0x6bf9abea));  // 2.4375f, 3.625f, 2.85577e-37f, -1.992e-24f, 6.03669e+26f
     SkPaint paint;
     paint.setAntiAlias(true);
     canvas->drawPath(path, paint);
 }
 
+static void test_fuzz_crbug_643933() {
+    auto surface(SkSurface::MakeRasterN32Premul(250, 250));
+    SkCanvas* canvas = surface->getCanvas();
+    SkPaint paint;
+    paint.setAntiAlias(true);
+    SkPath path;
+    path.moveTo(0, 0);
+    path.conicTo(SkBits2Float(0x002001f2), SkBits2Float(0x4161ffff),  // 2.93943e-39f, 14.125f
+            SkBits2Float(0x49f7224d), SkBits2Float(0x45eec8df), // 2.02452e+06f, 7641.11f
+            SkBits2Float(0x721aee0c));  // 3.0687e+30f
+    canvas->drawPath(path, paint);
+    path.reset();
+    path.moveTo(0, 0);
+    path.conicTo(SkBits2Float(0x00007ff2), SkBits2Float(0x4169ffff),  // 4.58981e-41f, 14.625f
+        SkBits2Float(0x43ff2261), SkBits2Float(0x41eeea04),  // 510.269f, 29.8643f
+        SkBits2Float(0x5d06eff8));  // 6.07704e+17f
+    canvas->drawPath(path, paint);
+}
+
 /**
  * In debug mode, this path was causing an assertion to fail in
  * SkPathStroker::preJoinTo() and, in Release, the use of an unitialized value.
  */
 static void make_path_crbugskia2820(SkPath* path, skiatest::Reporter* reporter) {
     SkPoint orig, p1, p2, p3;
     orig = SkPoint::Make(1.f, 1.f);
     p1 = SkPoint::Make(1.f - SK_ScalarNearlyZero, 1.f);
     p2 = SkPoint::Make(1.f, 1.f + SK_ScalarNearlyZero);
     p3 = SkPoint::Make(2.f, 2.f);
@@ skipping 4098 matching lines @@
 
 DEF_TEST(PathInterp, reporter) {
     test_interp(reporter);
 }
 
 DEF_TEST(PathContains, reporter) {
     test_contains(reporter);
 }
 
 DEF_TEST(Paths, reporter) {
+    test_fuzz_crbug_643933();
     test_sect_with_horizontal_needs_pinning();
     test_crbug_629455(reporter);
     test_fuzz_crbug_627414(reporter);
     test_path_crbug364224();
 
     SkTSize<SkScalar>::Make(3,4);
 
     SkPath  p, empty;
     SkRect  bounds, bounds2;
     test_empty(reporter, p);
@@ skipping 139 matching lines @@
     PathRefTest_Private::TestPathRef(reporter);
     PathTest_Private::TestPathrefListeners(reporter);
     test_dump(reporter);
     test_path_crbug389050(reporter);
     test_path_crbugskia2820(reporter);
     test_skbug_3469(reporter);
     test_skbug_3239(reporter);
     test_bounds_crbug_513799(reporter);
     test_fuzz_crbug_638223();
 }