[SVGDom/experimental] Initial SVGLength support

experimental/svg/model/SkSVGShape.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 SkSVGShape_DEFINED
+#define SkSVGShape_DEFINED
+
+#include "SkSVGTransformableNode.h"
+
+class SkSVGLengthContext;
+class SkPaint;
+
+class SkSVGShape : public SkSVGTransformableNode {
+public:
+    virtual ~SkSVGShape() = default;
+

[robertphillips, 2016/08/02 22:25:56]

Do we want to assert that this appendChild is never called ?

[f(malita), 2016/08/03 16:50:52]

Hmm, since this would be a public API it seems a bit harsh to crash if someone
attempts to append to the wrong node type.

But we should definitely signal the failure somehow - maybe add a result type at
some point?

Added an SkDebugf message for now.

+    void appendChild(sk_sp<SkSVGNode>) override { }
+
+protected:
+    SkSVGShape(SkSVGTag);
+
+    void onRender(SkCanvas*, const SkSVGRenderContext&) const final;
+
+    virtual void onDraw(SkCanvas*, const SkSVGLengthContext&, const SkPaint&) const = 0;
+
+private:
+    typedef SkSVGTransformableNode INHERITED;
+};
+
+#endif // SkSVGShape_DEFINED