Analytic rrect clip for cicular corners, radius >= .5

src/gpu/effects/GrRRectEffect.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 GrRRectEffect_DEFINED
+#define GrRRectEffect_DEFINED
+
+#include "GrEffect.h"
+
+#include "SkRRect.h"
+
+class GrGLRRectEffect;
+
+/**
+ * An effect that performs anti-aliasing for an SkRRect. It doesn't support all varieties of SkRRect
+ * so the caller must check for a NULL return from the Create() method.
+ */
+class GrRRectEffect : public GrEffect {
+public:
+    static GrEffectRef* Create(const SkRRect&);
+
+    virtual ~GrRRectEffect();
+    static const char* Name() { return "RRect"; }
+
+    const SkRRect& getRRect() const { return fRRect; }
+
+    typedef GrGLRRectEffect GLEffect;
+
+    virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE;
+
+    virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE;
+
+private:
+    GrRRectEffect(const SkRRect&);
+
+    virtual bool onIsEqual(const GrEffect& other) const SK_OVERRIDE;
+
+    SkRRect fRRect;
+
+    GR_DECLARE_EFFECT_TEST;
+
+    typedef GrEffect INHERITED;
+};
+
+
+#endif