[SVGDom/experimental] Initial SVGLength support

experimental/svg/model/SkSVGRect.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 "SkCanvas.h"
+#include "SkRect.h"
+#include "SkSVGRect.h"
+#include "SkSVGRenderContext.h"
+#include "SkSVGValue.h"
+
+SkSVGRect::SkSVGRect() : INHERITED(SkSVGTag::kRect) {}
+
+void SkSVGRect::setX(const SkSVGLength& x) {
+    fX = x;
+}
+
+void SkSVGRect::setY(const SkSVGLength& y) {
+    fY = y;
+}
+
+void SkSVGRect::setWidth(const SkSVGLength& w) {
+    fWidth = w;
+}
+
+void SkSVGRect::setHeight(const SkSVGLength& h) {
+    fHeight = h;
+}
+
+void SkSVGRect::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);
+    }
+}
+
+void SkSVGRect::onDraw(SkCanvas* canvas, const SkSVGLengthContext& lctx,
+                       const SkPaint& paint) const {
+    const SkRect r = SkRect::MakeXYWH(
+        lctx.resolve(fX, SkSVGLengthContext::LengthType::kHorizontal),
+        lctx.resolve(fY, SkSVGLengthContext::LengthType::kVertical),
+        lctx.resolve(fWidth, SkSVGLengthContext::LengthType::kHorizontal),
+        lctx.resolve(fHeight, SkSVGLengthContext::LengthType::kVertical));
+
+    canvas->drawRect(r, paint);
+}