1 files changed, 104 insertions, 0 deletions
diff --git a/gfx/tests/gtest/TestPolygon.cpp b/gfx/tests/gtest/TestPolygon.cpp
new file mode 100644
index 0000000000..168f7b46d9
--- /dev/null
+++ b/gfx/tests/gtest/TestPolygon.cpp
@@ -0,0 +1,104 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "gtest/gtest.h"
+
+#include "PolygonTestUtils.h"
+
+#include "nsTArray.h"
+#include "Point.h"
+#include "Polygon.h"
+#include "Triangle.h"
+
+using namespace mozilla::gfx;
+typedef mozilla::gfx::Polygon MozPolygon;
+
+TEST(MozPolygon, TriangulateRectangle)
+{
+  const MozPolygon p{
+      Point4D(0.0f, 0.0f, 1.0f, 1.0f), Point4D(0.0f, 1.0f, 1.0f, 1.0f),
+      Point4D(1.0f, 1.0f, 1.0f, 1.0f), Point4D(1.0f, 0.0f, 1.0f, 1.0f)};
+
+  const nsTArray<Triangle> triangles = p.ToTriangles();
+  const nsTArray<Triangle> expected = {
+      Triangle(Point(0.0f, 0.0f), Point(0.0f, 1.0f), Point(1.0f, 1.0f)),
+      Triangle(Point(0.0f, 0.0f), Point(1.0f, 1.0f), Point(1.0f, 0.0f))};
+
+  AssertArrayEQ(triangles, expected);
+}
+
+TEST(MozPolygon, TriangulatePentagon)
+{
+  const MozPolygon p{
+      Point4D(0.0f, 0.0f, 1.0f, 1.0f), Point4D(0.0f, 1.0f, 1.0f, 1.0f),
+      Point4D(0.5f, 1.5f, 1.0f, 1.0f), Point4D(1.0f, 1.0f, 1.0f, 1.0f),
+      Point4D(1.0f, 0.0f, 1.0f, 1.0f)};
+
+  const nsTArray<Triangle> triangles = p.ToTriangles();
+  const nsTArray<Triangle> expected = {
+      Triangle(Point(0.0f, 0.0f), Point(0.0f, 1.0f), Point(0.5f, 1.5f)),
+      Triangle(Point(0.0f, 0.0f), Point(0.5f, 1.5f), Point(1.0f, 1.0f)),
+      Triangle(Point(0.0f, 0.0f), Point(1.0f, 1.0f), Point(1.0f, 0.0f))};
+
+  AssertArrayEQ(triangles, expected);
+}
+
+static void TestClipRect(const MozPolygon& aPolygon,
+                         const MozPolygon& aExpected, const Rect& aRect) {
+  const MozPolygon res = aPolygon.ClipPolygon(MozPolygon::FromRect(aRect));
+  EXPECT_TRUE(res == aExpected);
+}
+
+TEST(MozPolygon, ClipRectangle)
+{
+  MozPolygon polygon{
+      Point4D(0.0f, 0.0f, 0.0f, 1.0f), Point4D(0.0f, 1.0f, 0.0f, 1.0f),
+      Point4D(1.0f, 1.0f, 0.0f, 1.0f), Point4D(1.0f, 0.0f, 0.0f, 1.0f)};
+  TestClipRect(polygon, polygon, Rect(0.0f, 0.0f, 1.0f, 1.0f));
+
+  MozPolygon expected = MozPolygon{
+      Point4D(0.0f, 0.0f, 0.0f, 1.0f), Point4D(0.0f, 0.8f, 0.0f, 1.0f),
+      Point4D(0.8f, 0.8f, 0.0f, 1.0f), Point4D(0.8f, 0.0f, 0.0f, 1.0f)};
+  TestClipRect(polygon, expected, Rect(0.0f, 0.0f, 0.8f, 0.8f));
+
+  expected = MozPolygon{
+      Point4D(0.2f, 0.2f, 0.0f, 1.0f), Point4D(0.2f, 1.0f, 0.0f, 1.0f),
+      Point4D(1.0f, 1.0f, 0.0f, 1.0f), Point4D(1.0f, 0.2f, 0.0f, 1.0f)};
+  TestClipRect(polygon, expected, Rect(0.2f, 0.2f, 0.8f, 0.8f));
+
+  expected = MozPolygon{
+      Point4D(0.2f, 0.2f, 0.0f, 1.0f), Point4D(0.2f, 0.8f, 0.0f, 1.0f),
+      Point4D(0.8f, 0.8f, 0.0f, 1.0f), Point4D(0.8f, 0.2f, 0.0f, 1.0f)};
+  TestClipRect(polygon, expected, Rect(0.2f, 0.2f, 0.6f, 0.6f));
+}
+
+TEST(MozPolygon, ClipTriangle)
+{
+  MozPolygon clipped, expected;
+  const MozPolygon polygon{Point4D(0.0f, 0.0f, 0.0f, 1.0f),
+                           Point4D(0.0f, 1.0f, 0.0f, 1.0f),
+                           Point4D(1.0f, 1.0f, 0.0f, 1.0f)};
+
+  expected = MozPolygon{Point4D(0.0f, 0.0f, 0.0f, 1.0f),
+                        Point4D(0.0f, 1.0f, 0.0f, 1.0f),
+                        Point4D(1.0f, 1.0f, 0.0f, 1.0f)};
+  TestClipRect(polygon, expected, Rect(0.0f, 0.0f, 1.0f, 1.0f));
+
+  expected = MozPolygon{Point4D(0.0f, 0.0f, 0.0f, 1.0f),
+                        Point4D(0.0f, 0.8f, 0.0f, 1.0f),
+                        Point4D(0.8f, 0.8f, 0.0f, 1.0f)};
+  TestClipRect(polygon, expected, Rect(0.0f, 0.0f, 0.8f, 0.8f));
+
+  expected = MozPolygon{Point4D(0.2f, 0.2f, 0.0f, 1.0f),
+                        Point4D(0.2f, 1.0f, 0.0f, 1.0f),
+                        Point4D(1.0f, 1.0f, 0.0f, 1.0f)};
+  TestClipRect(polygon, expected, Rect(0.2f, 0.2f, 0.8f, 0.8f));
+
+  expected = MozPolygon{Point4D(0.2f, 0.2f, 0.0f, 1.0f),
+                        Point4D(0.2f, 0.8f, 0.0f, 1.0f),
+                        Point4D(0.8f, 0.8f, 0.0f, 1.0f)};
+  TestClipRect(polygon, expected, Rect(0.2f, 0.2f, 0.6f, 0.6f));
+}