Add base types for path ops

tests/PathOpsDLineTest.cpp

Index: tests/PathOpsDLineTest.cpp
===================================================================
--- tests/PathOpsDLineTest.cpp	(revision 0)
+++ tests/PathOpsDLineTest.cpp	(revision 0)
@@ -0,0 +1,54 @@
+/*
+ * 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 "SkPathOpsLine.h"
+#include "Test.h"
+
+static const SkDLine tests[] = {
+    {{{2, 1}, {2, 1}}},
+    {{{2, 1}, {1, 1}}},
+    {{{2, 1}, {2, 2}}},
+    {{{1, 1}, {2, 2}}},
+    {{{3, 0}, {2, 1}}},
+    {{{3, 2}, {1, 1}}},
+};
+
+static const SkDPoint left[] = {
+    {2, 1},
+    {1, 0},
+    {1, 1},
+    {1, 2},
+    {2, 0},
+    {2, 1}
+};
+
+static const size_t tests_count = sizeof(tests) / sizeof(tests[0]);
+
+static void DLineTest(skiatest::Reporter* reporter) {
+    for (size_t index = 0; index < tests_count; ++index) {
+        const SkDLine& line = tests[index];
+        SkDLine line2;
+        SkPoint pts[2] = {line[0].asSkPoint(), line[1].asSkPoint()};
+        line2.set(pts);
+        REPORTER_ASSERT(reporter, line[0] == line2[0] && line[1] == line2[1]);
+        const SkDPoint& pt = left[index];
+        int result = line.isLeft(pt);
+        if ((result <= 0 && index >= 1) || (result < 0 && index == 0)) {
+            SkDebugf("%s [%d] expected left\n", __FUNCTION__, index);
+            REPORTER_ASSERT(reporter, 0);
+        }
+        line2 = line.subDivide(1, 0);
+        REPORTER_ASSERT(reporter, line[0] == line2[1] && line[1] == line2[0]);
+        line2 = SkDLine::SubDivide(pts, 1, 0);
+        REPORTER_ASSERT(reporter, line[0] == line2[1] && line[1] == line2[0]);
+        SkDPoint mid = line.xyAtT(.5);
+        REPORTER_ASSERT(reporter, approximately_equal((line[0].fX + line[1].fX) / 2, mid.fX));
+        REPORTER_ASSERT(reporter, approximately_equal((line[0].fY + line[1].fY) / 2, mid.fY));
+    }
+}
+
+#include "TestClassDef.h"
+DEFINE_TESTCLASS("PathOpsLineUtilities", PathOpsLineUtilitiesClass, DLineTest)