[skottie] Add support for round-corners geometry effects

TBR=
Change-Id: I5505561df28d5953526662d60fe2300cb112bc37
Reviewed-on: https://skia-review.googlesource.com/124769
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>

1 files changed, 50 insertions, 0 deletions

diff --git a/experimental/sksg/geometry/SkSGRoundEffect.h b/experimental/sksg/geometry/SkSGRoundEffect.h
new file mode 100644
index 0000000000..67124ca072
--- /dev/null
+++ b/experimental/sksg/geometry/SkSGRoundEffect.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright 2018 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkSGRoundEffect_DEFINED
+#define SkSGRoundEffect_DEFINED
+
+#include "SkSGGeometryNode.h"
+
+#include "SkPath.h"
+
+namespace sksg {
+
+/**
+ * Concrete Geometry node, applying a rounded-corner effect to its child.
+ */
+class RoundEffect final : public GeometryNode {
+public:
+    static sk_sp<RoundEffect> Make(sk_sp<GeometryNode> child) {
+        return child ? sk_sp<RoundEffect>(new RoundEffect(std::move(child))) : nullptr;
+    }
+
+    ~RoundEffect() override;
+
+    SG_ATTRIBUTE(Radius, SkScalar, fRadius)
+
+protected:
+    void onClip(SkCanvas*, bool antiAlias) const override;
+    void onDraw(SkCanvas*, const SkPaint&) const override;
+
+    SkRect onRevalidate(InvalidationController*, const SkMatrix&) override;
+    SkPath onAsPath() const override;
+
+private:
+    explicit RoundEffect(sk_sp<GeometryNode>);
+
+    const sk_sp<GeometryNode> fChild;
+
+    SkPath                    fRoundedPath;
+    SkScalar                  fRadius = 0;
+
+    using INHERITED = GeometryNode;
+};
+
+} // namespace sksg
+
+#endif // SkSGRoundEffect_DEFINED