path ops : add support for inverse fill

tests/PathOpsInverseTest.cpp

+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#include "PathOpsExtendedTest.h"
+
+static void PathOpsInverseTest(skiatest::Reporter* reporter) {
+    SkPath one, two;
+    for (int op = kDifference_PathOp; op <= kReverseDifference_PathOp; ++op) {
+        for (int oneFill = SkPath::kWinding_FillType; oneFill <= SkPath::kInverseEvenOdd_FillType;
+                    ++oneFill) {
+            for (int oneDir = SkPath::kCW_Direction; oneDir != SkPath::kCCW_Direction; ++oneDir) {
+                one.reset();
+                one.setFillType((SkPath::FillType) oneFill);
+                one.addRect(0, 0, 6, 6, (SkPath::Direction) oneDir);
+                for (int twoFill = SkPath::kWinding_FillType;
+                        twoFill <= SkPath::kInverseEvenOdd_FillType; ++twoFill) {
+                    for (int twoDir = SkPath::kCW_Direction; twoDir != SkPath::kCCW_Direction;
+                            ++twoDir) {
+                        two.reset();
+                        two.setFillType((SkPath::FillType) twoFill);
+                        two.addRect(3, 3, 9, 9, (SkPath::Direction) twoDir);
+                        testPathOp(reporter, one, two, (SkPathOp) op);
+                    }
+                }
+            }
+        }
+    }
+}
+
+#include "TestClassDef.h"
+DEFINE_TESTCLASS_SHORT(PathOpsInverseTest)