WIP: GPU-accelerated trapezoidal path renderer.

src/gpu/GrAAConcavePathRenderer.h

+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef GrAAConcavePathRenderer_DEFINED
+#define GrAAConcavePathRenderer_DEFINED
+
+#include "GrPathRenderer.h"
+#include "SkTemplates.h"
+
+/**
+ *  Subclass that renders the path by converting to screen-space trapezoids plus
+ *   extra 1-pixel geometry for AA.
+ */
+class SK_API GrAAConcavePathRenderer : public GrPathRenderer {
+public:
+    GrAAConcavePathRenderer();
+
+private:
+
+    bool onCanDrawPath(const CanDrawPathArgs& args) const override;
+
+    StencilSupport onGetStencilSupport(const SkPath&,
+                                       const GrStrokeInfo&) const override;
+
+    bool onDrawPath(const DrawPathArgs& args) override;
+
+    typedef GrPathRenderer INHERITED;
+};
+
+#endif