Add base types for path ops

tests/PathOpsDVectorTest.cpp

Index: tests/PathOpsDVectorTest.cpp
===================================================================
--- tests/PathOpsDVectorTest.cpp	(revision 0)
+++ tests/PathOpsDVectorTest.cpp	(revision 0)
@@ -0,0 +1,50 @@
+/*
+ * 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 "SkPathOpsPoint.h"
+#include "Test.h"
+
+static const SkDPoint tests[] = {
+    {0, 0},
+    {1, 0},
+    {0, 1},
+    {2, 1},
+    {1, 2},
+    {1, 1},
+    {2, 2}
+};
+
+static const size_t tests_count = sizeof(tests) / sizeof(tests[0]);
+
+static void DVectorTest(skiatest::Reporter* reporter) {
+    for (size_t index = 0; index < tests_count - 1; ++index) {
+        SkDVector v1 = tests[index + 1] - tests[index];
+        SkDVector v2 = tests[index] - tests[index + 1];
+        v1 += v2;
+        REPORTER_ASSERT(reporter, v1.fX == 0 && v1.fY == 0);
+        SkDPoint p = tests[index + 1] + v2;
+        REPORTER_ASSERT(reporter, p == tests[index]);
+        v2 -= v2;
+        REPORTER_ASSERT(reporter, v2.fX == 0 && v2.fY == 0);
+        v1 = tests[index + 1] - tests[index];
+        v1 /= 2;
+        v1 *= 2;
+        v1 -= tests[index + 1] - tests[index];
+        REPORTER_ASSERT(reporter, v1.fX == 0 && v1.fY == 0);
+        SkVector sv = v1.asSkVector();
+        REPORTER_ASSERT(reporter, sv.fX == 0 && sv.fY == 0);
+        v1 = tests[index + 1] - tests[index];
+        double lenSq = v1.lengthSquared();
+        double v1Dot = v1.dot(v1);
+        REPORTER_ASSERT(reporter, lenSq == v1Dot);
+        REPORTER_ASSERT(reporter, approximately_equal(sqrt(lenSq), v1.length()));
+        double v1Cross = v1.cross(v1);
+        REPORTER_ASSERT(reporter, v1Cross == 0);
+    }
+}
+
+#include "TestClassDef.h"
+DEFINE_TESTCLASS("PathOpsDVector", PathOpsDVectorClass, DVectorTest)