[SVGDom/experimental] Initial SVGLength support

experimental/svg/model/SkSVGSVG.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkSVGSVG.h"
+#include "SkSVGValue.h"
 
 SkSVGSVG::SkSVGSVG() : INHERITED(SkSVGTag::kSvg) { }
+
+void SkSVGSVG::setX(const SkSVGLength& x) {
+    fX = x;
+}
+
+void SkSVGSVG::setY(const SkSVGLength& y) {
+    fY = y;
+}
+
+void SkSVGSVG::setWidth(const SkSVGLength& w) {
+    fWidth = w;
+}
+
+void SkSVGSVG::setHeight(const SkSVGLength& h) {
+    fHeight = h;
+}
+
+void SkSVGSVG::onSetAttribute(SkSVGAttribute attr, const SkSVGValue& v) {
+    switch (attr) {
+    case SkSVGAttribute::kX:
+        if (const auto* x = v.as<SkSVGLengthValue>()) {
+            this->setX(*x);
+        }
+        break;
+    case SkSVGAttribute::kY:
+        if (const auto* y = v.as<SkSVGLengthValue>()) {
+            this->setY(*y);
+        }
+        break;
+    case SkSVGAttribute::kWidth:
+        if (const auto* w = v.as<SkSVGLengthValue>()) {
+            this->setWidth(*w);
+        }
+        break;
+    case SkSVGAttribute::kHeight:
+        if (const auto* h = v.as<SkSVGLengthValue>()) {
+            this->setHeight(*h);
+        }
+        break;
+    default:
+        this->INHERITED::onSetAttribute(attr, v);
+    }
+}