1 files changed, 53 insertions, 0 deletions
diff --git a/experimental/sksg/geometry/SkSGTrimEffect.h b/experimental/sksg/geometry/SkSGTrimEffect.h
new file mode 100644
index 0000000000..77da3ab2d0
--- /dev/null
+++ b/experimental/sksg/geometry/SkSGTrimEffect.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkSGTrimEffect_DEFINED
+#define SkSGTrimEffect_DEFINED
+
+#include "SkSGGeometryNode.h"
+
+#include "SkPath.h"
+
+class SkCanvas;
+class SkPaint;
+
+namespace sksg {
+
+/**
+ * Concrete Geometry node, applying a trim effect to its child.
+ */
+class TrimEffect final : public GeometryNode {
+public:
+    static sk_sp<TrimEffect> Make(sk_sp<GeometryNode> child) {
+        return child ? sk_sp<TrimEffect>(new TrimEffect(std::move(child))) : nullptr;
+    }
+
+    ~TrimEffect() override;
+
+    SG_ATTRIBUTE(Start , SkScalar, fStart )
+    SG_ATTRIBUTE(End   , SkScalar, fEnd   )
+    SG_ATTRIBUTE(Offset, SkScalar, fOffset)
+
+protected:
+    void onDraw(SkCanvas*, const SkPaint&) const override;
+
+    SkRect onRevalidate(InvalidationController*, const SkMatrix&) override;
+    SkPath onAsPath() const override;
+
+private:
+    explicit TrimEffect(sk_sp<GeometryNode>);
+
+    const sk_sp<GeometryNode> fChild;
+
+    SkScalar                  fStart  = 0, // starting t
+                              fEnd    = 1, // ending t
+                              fOffset = 0; // t offset
+};
+
+} // namespace sksg
+
+#endif // SkSGTrimEffect_DEFINED