[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, 13 insertions, 0 deletions

diff --git a/experimental/svg/model/SkSVGTransformableNode.cpp b/experimental/svg/model/SkSVGTransformableNode.cpp
index 8a095ac62a..b2ad0b1ab9 100644
--- a/experimental/svg/model/SkSVGTransformableNode.cpp
+++ b/experimental/svg/model/SkSVGTransformableNode.cpp
@@ -36,3 +36,16 @@ void SkSVGTransformableNode::onSetAttribute(SkSVGAttribute attr, const SkSVGValu
         break;
     }
 }
+
+void SkSVGTransformableNode::mapToParent(SkPath* path) const {
+    if (fTransform.value().isIdentity()) {
+        return;
+    }
+
+    SkMatrix inv;
+    if (!fTransform.value().invert(&inv)) {
+        return;
+    }
+
+    path->transform(inv);
+}