add specialty strokeRect() to SkStroke, which can return much cleaner results

Review URL: https://codereview.appspot.com/6843093

git-svn-id: http://skia.googlecode.com/svn/trunk@6510 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 64 insertions, 0 deletions

diff --git a/tests/StrokeTest.cpp b/tests/StrokeTest.cpp
new file mode 100644
index 0000000000..a6c481a136
--- /dev/null
+++ b/tests/StrokeTest.cpp
@@ -0,0 +1,64 @@
+/*
+ * 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 "Test.h"
+#include "SkPaint.h"
+#include "SkPath.h"
+#include "SkRect.h"
+#include "SkStroke.h"
+
+static bool equal(const SkRect& a, const SkRect& b) {
+    return  SkScalarNearlyEqual(a.left(), b.left()) &&
+            SkScalarNearlyEqual(a.top(), b.top()) &&
+            SkScalarNearlyEqual(a.right(), b.right()) &&
+            SkScalarNearlyEqual(a.bottom(), b.bottom());
+}
+
+static void test_strokerect(skiatest::Reporter* reporter) {
+    const SkScalar width = SkIntToScalar(10);
+    SkPaint paint;
+
+    paint.setStyle(SkPaint::kStroke_Style);
+    paint.setStrokeWidth(width);
+
+    SkRect r = { 0, 0, SkIntToScalar(200), SkIntToScalar(100) };
+
+    SkRect outer(r);
+    outer.outset(width/2, width/2);
+
+    static const SkPaint::Join joins[] = {
+        SkPaint::kMiter_Join, SkPaint::kRound_Join, SkPaint::kBevel_Join
+    };
+
+    for (size_t i = 0; i < SK_ARRAY_COUNT(joins); ++i) {
+        paint.setStrokeJoin(joins[i]);
+
+        SkPath path, fillPath;
+        path.addRect(r);
+        paint.getFillPath(path, &fillPath);
+
+        REPORTER_ASSERT(reporter, equal(outer, fillPath.getBounds()));
+        
+        bool isMiter = SkPaint::kMiter_Join == joins[i];
+        SkRect nested[2];
+        REPORTER_ASSERT(reporter, fillPath.isNestedRects(nested) == isMiter);
+        if (isMiter) {
+            SkRect inner(r);
+            inner.inset(width/2, width/2);
+            REPORTER_ASSERT(reporter, equal(nested[0], outer));
+            REPORTER_ASSERT(reporter, equal(nested[1], inner));
+        }
+    }
+}
+
+static void TestStroke(skiatest::Reporter* reporter) {
+    test_strokerect(reporter);
+}
+
+#include "TestClassDef.h"
+DEFINE_TESTCLASS("Stroke", TestStrokeClass, TestStroke)
+