Add more tests for PolyUtils

* Add fuzzer
* Add bench tests
* Add additional unit test
* Fix some bugs these exposed.

Bug: skia:
Change-Id: I6c587c92cb6cff32ab8300020b78f9f247d2bf64
Reviewed-on: https://skia-review.googlesource.com/139169
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>

1 files changed, 48 insertions, 0 deletions

diff --git a/fuzz/FuzzPolyUtils.cpp b/fuzz/FuzzPolyUtils.cpp
new file mode 100644
index 0000000000..fda5b5f34a
--- /dev/null
+++ b/fuzz/FuzzPolyUtils.cpp
@@ -0,0 +1,48 @@
+/*
+ * Copyright 2018 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "Fuzz.h"
+#include "FuzzCommon.h"
+#include "SkPolyUtils.h"
+
+void inline ignoreResult(bool ) {}
+
+DEF_FUZZ(PolyUtils, fuzz) {
+    int count;
+    fuzz->nextRange(&count, 0, 512);
+    SkAutoSTMalloc<64, SkPoint> polygon(count);
+    for (int index = 0; index < count; ++index) {
+        fuzz->next(&polygon[index].fX, &polygon[index].fY);
+    }
+
+    ignoreResult(SkGetPolygonWinding(polygon, count));
+    ignoreResult(SkIsConvexPolygon(polygon, count));
+    ignoreResult(SkIsSimplePolygon(polygon, count));
+
+    SkScalar inset;
+    fuzz->next(&inset);
+    SkTDArray<SkPoint> output;
+    ignoreResult(SkInsetConvexPolygon(polygon, count, inset, &output));
+    std::function<SkScalar(const SkPoint&)> distanceFunc = [fuzz](const SkPoint& p) {
+        SkScalar retVal;
+        fuzz->next(&retVal);
+        return retVal;
+    };
+    ignoreResult(SkInsetConvexPolygon(polygon, count, distanceFunc, &output));
+
+    SkScalar offset;
+    fuzz->next(&offset);
+    ignoreResult(SkOffsetSimplePolygon(polygon, count, offset, &output));
+    ignoreResult(SkOffsetSimplePolygon(polygon, count, distanceFunc, &output));
+
+    SkAutoSTMalloc<64, uint16_t> indexMap(count);
+    for (int index = 0; index < count; ++index) {
+        fuzz->next(&indexMap[index]);
+    }
+    SkTDArray<uint16_t> outputIndices;
+    ignoreResult(SkTriangulateSimplePolygon(polygon, indexMap, count, &outputIndices));
+}