[SVGDom] ClipPath support

  * clip-path attribute handling
  * clipPath container element
  * asPath() SkSVGNode virtual for capturing subtree geometry

R=robertphillips@google.com,stephana@google.com

Change-Id: I9597534fe3047b631da6309eafac055dff5696e9
Reviewed-on: https://skia-review.googlesource.com/5650
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/experimental/svg/model/SkSVGContainer.cpp b/experimental/svg/model/SkSVGContainer.cpp
index af19608d25..9f526c22c3 100644
--- a/experimental/svg/model/SkSVGContainer.cpp
+++ b/experimental/svg/model/SkSVGContainer.cpp
@@ -7,6 +7,9 @@
 
 #include "SkSVGContainer.h"
 
+#include "SkPath.h"
+#include "SkPathOps.h"
+
 SkSVGContainer::SkSVGContainer(SkSVGTag t) : INHERITED(t) { }
 
 void SkSVGContainer::appendChild(sk_sp<SkSVGNode> node) {
@@ -23,3 +26,16 @@ void SkSVGContainer::onRender(const SkSVGRenderContext& ctx) const {
         fChildren[i]->render(ctx);
     }
 }
+
+SkPath SkSVGContainer::onAsPath(const SkSVGRenderContext& ctx) const {
+    SkPath path;
+
+    for (int i = 0; i < fChildren.count(); ++i) {
+        const SkPath childPath = fChildren[i]->asPath(ctx);
+
+        Op(path, childPath, kUnion_SkPathOp, &path);
+    }
+
+    this->mapToParent(&path);
+    return path;
+}