[skottie] Layer clip support

TBR=

Change-Id: Ibf65efc69031f8f6e19f4f28cccab29c357e704d
Reviewed-on: https://skia-review.googlesource.com/101540
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/effects/SkSGClipEffect.h b/experimental/sksg/effects/SkSGClipEffect.h
new file mode 100644
index 0000000000..674edb2b5c
--- /dev/null
+++ b/experimental/sksg/effects/SkSGClipEffect.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 SkSGClipEffect_DEFINED
+#define SkSGClipEffect_DEFINED
+
+#include "SkSGEffectNode.h"
+
+namespace sksg {
+
+class GeometryNode;
+
+/**
+ * Concrete Effect node, applying a clip to its descendants.
+ *
+ */
+class ClipEffect final : public EffectNode {
+public:
+    static sk_sp<ClipEffect> Make(sk_sp<RenderNode> child, sk_sp<GeometryNode> clip,
+                                  bool aa = false) {
+        return (child && clip)
+            ? sk_sp<ClipEffect>(new ClipEffect(std::move(child), std::move(clip), aa))
+            : nullptr;
+    }
+
+    ~ClipEffect() override;
+
+protected:
+    ClipEffect(sk_sp<RenderNode>, sk_sp<GeometryNode>, bool aa);
+
+    void onRender(SkCanvas*) const override;
+
+    SkRect onRevalidate(InvalidationController*, const SkMatrix&) override;
+
+private:
+    const sk_sp<GeometryNode> fClipNode;
+    const bool                fAntiAlias;
+
+    bool                      fNoop = false;
+
+    typedef EffectNode INHERITED;
+};
+
+} // namespace sksg
+
+#endif // SkSGClipEffect_DEFINED