fix hairline clip

gm/bug5252.cpp

Index: gm/bug5252.cpp
diff --git a/gm/bug5252.cpp b/gm/bug5252.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..9142a1e37f3ecf5f00109fa9f213043ff35f23f1
--- /dev/null
+++ b/gm/bug5252.cpp
@@ -0,0 +1,43 @@
+/*
+* Copyright 2016 Google Inc.
+*
+* Use of this source code is governed by a BSD-style license that can be
+* found in the LICENSE file.
+*/
+
+#include "gm.h"
+#include "SkCanvas.h"
+#include "SkRect.h"
+#include "SkPath.h"
+
+DEF_SIMPLE_GM(bug5252, canvas, 500, 500) {
+	canvas->translate(SkIntToScalar(10), SkIntToScalar(20));
+
+	SkPath clip1;
+	clip1.addOval(SkRect::MakeWH(225, 200));
+	canvas->clipPath(clip1); // bug
+
+	SkPath clip2;
+	clip2.addRect(SkRect::MakeWH(220, 200));
+	//canvas->clipPath(clip2); // ok
+
+	SkPaint pa;
+	pa.setStyle(SkPaint::kStroke_Style);
+	pa.setAntiAlias(true);
+	pa.setStrokeWidth(1.0f);
+	for (int i = 0; i < 15; i++)
+	{
+		for (int j = 0; j < 10; j++)
+		{
+			SkAutoCanvasRestore acs(canvas, true);
+
+			canvas->translate(i * 15.f, j * 20.f);
+			canvas->drawRect(SkRect::MakeXYWH(5, 5, 10, 15),pa);
+			SkPath path;
+			path.moveTo(6, 6);
+			path.cubicTo(14, 10, 13, 12, 10, 12);
+			path.cubicTo(7, 15, 8, 17, 14, 18);
+			canvas->drawPath(path, pa);
+		}
+	}
+}