1 files changed, 85 insertions, 0 deletions
diff --git a/modules/sksg/include/SkSGScene.h b/modules/sksg/include/SkSGScene.h
new file mode 100644
index 0000000000..2081c1d747
--- /dev/null
+++ b/modules/sksg/include/SkSGScene.h
@@ -0,0 +1,85 @@
+/*
+ * 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 SkSGScene_DEFINED
+#define SkSGScene_DEFINED
+
+#include "SkRefCnt.h"
+#include "SkTypes.h"
+
+#include <memory>
+#include <vector>
+
+class SkCanvas;
+
+namespace sksg {
+
+class RenderNode;
+
+/**
+ * Base class for animators.
+ *
+ */
+class Animator : public SkNoncopyable {
+public:
+    virtual ~Animator();
+
+    void tick(float t);
+
+protected:
+    Animator();
+
+    virtual void onTick(float t) = 0;
+
+private:
+    using INHERITED = SkNoncopyable;
+};
+
+using AnimatorList = std::vector<std::unique_ptr<Animator>>;
+
+class GroupAnimator : public Animator {
+protected:
+    explicit GroupAnimator(AnimatorList&&);
+
+    void onTick(float t) override;
+
+private:
+    const AnimatorList fAnimators;
+
+    using INHERITED = Animator;
+};
+
+/**
+ * Holds a scene root and a list of animators.
+ *
+ * Provides high-level mehods for driving rendering and animations.
+ *
+ */
+class Scene final : SkNoncopyable {
+public:
+    static std::unique_ptr<Scene> Make(sk_sp<RenderNode> root, AnimatorList&& animators);
+    ~Scene();
+
+    void render(SkCanvas*) const;
+    void animate(float t);
+
+    void setShowInval(bool show) { fShowInval = show; }
+
+private:
+    Scene(sk_sp<RenderNode> root, AnimatorList&& animators);
+
+    const sk_sp<RenderNode> fRoot;
+    const AnimatorList      fAnimators;
+
+    bool                    fShowInval = false;
+
+    using INHERITED = SkNoncopyable;
+};
+
+} // namespace sksg
+
+#endif // SkSGScene_DEFINED