1 files changed, 44 insertions, 0 deletions
diff --git a/experimental/sksg/effects/SkSGMaskEffect.h b/experimental/sksg/effects/SkSGMaskEffect.h
new file mode 100644
index 0000000000..aef82b4ef6
--- /dev/null
+++ b/experimental/sksg/effects/SkSGMaskEffect.h
@@ -0,0 +1,44 @@
+/*
+ * 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 SkSGMaskEffect_DEFINED
+#define SkSGMaskEffect_DEFINED
+
+#include "SkSGEffectNode.h"
+
+namespace sksg {
+
+/**
+ * Concrete Effect node, applying a mask to its descendants.
+ *
+ */
+class MaskEffect final : public EffectNode {
+public:
+    static sk_sp<MaskEffect> Make(sk_sp<RenderNode> child, sk_sp<RenderNode> mask) {
+        return (child && mask)
+            ? sk_sp<MaskEffect>(new MaskEffect(std::move(child), std::move(mask)))
+            : nullptr;
+    }
+
+    ~MaskEffect() override;
+
+protected:
+    MaskEffect(sk_sp<RenderNode>, sk_sp<RenderNode> mask);
+
+    void onRender(SkCanvas*) const override;
+
+    SkRect onRevalidate(InvalidationController*, const SkMatrix&) override;
+
+private:
+    sk_sp<RenderNode> fMaskNode;
+
+    typedef EffectNode INHERITED;
+};
+
+} // namespace sksg
+
+#endif // SkSGMaskEffect_DEFINED