Initial SVG model

experimental/svg/model/SkSVGNode.h

+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkSVGNode_DEFINED
+#define SkSVGNode_DEFINED
+
+#include "SkRefCnt.h"
+#include "SkSVGAttribute.h"
+
+class SkCanvas;
+class SkMatrix;
+class SkSVGRenderContext;
+class SkSVGValue;
+
+enum class SkSVGTag {
+    g,
+    path,
+    svg
+};
+
+class SkSVGNode : public SkRefCnt {
+public:
+    virtual ~SkSVGNode();
+
+    SkSVGTag tag() const { return fTag; }
+
+    virtual void appendChild(sk_sp<SkSVGNode>) = 0;
+
+    void render(SkCanvas*) const;
+    void render(SkCanvas*, const SkSVGRenderContext&) const;
+
+    void setAttribute(SkSVGAttribute, const SkSVGValue&);
+
+protected:
+    SkSVGNode(SkSVGTag);
+
+    virtual void onRender(SkCanvas*, const SkSVGRenderContext&) const = 0;
+
+    virtual void onSetAttribute(SkSVGAttribute, const SkSVGValue&);
+
+    virtual const SkMatrix& onLocalMatrix() const;
+
+private:
+    SkSVGTag                    fTag;
+
+    // FIXME: this should be sparse
+    SkSVGPresentationAttributes fPresentationAttributes;
+
+    typedef SkRefCnt INHERITED;
+};
+
+#endif // SkSVGNode_DEFINED