[sksg] Hit-testing API
Introduce RenderNode::nodeAt(const SkPoint&) as the entry point for the hit-testing API.
This is backed by a onNodeAt() virtual, which gets dispatched throughout the render DAG,
and normally stops at the first leaf Draw node in encounters.
To support the implementation, introduce a GeometryNode::contains(const SkPoint&) API.
This is backed by a onContains() virtual, overridden in each concrete geometry class.
Expose nodeAt() on sksg::Scene, and add some basic unit tests.
Change-Id: I0c8abd9d1e51ecf2d8b4dd699f325cd636e21084
Reviewed-on: https://skia-review.googlesource.com/c/191296
Commit-Queue: Florin Malita <fmalita@chromium.org>
Reviewed-by: Mike Reed <reed@google.com>
diff --git a/modules/sksg/src/SkSGGroup.cpp b/modules/sksg/src/SkSGGroup.cpp
index fff7436..cc44b31 100644
--- a/modules/sksg/src/SkSGGroup.cpp
+++ b/modules/sksg/src/SkSGGroup.cpp
@@ -66,6 +66,16 @@
}
}
+const RenderNode* Group::onNodeAt(const SkPoint& p) const {
+ for (const auto& child : fChildren) {
+ if (const auto* node = child->nodeAt(p)) {
+ return node;
+ }
+ }
+
+ return nullptr;
+}
+
SkRect Group::onRevalidate(InvalidationController* ic, const SkMatrix& ctm) {
SkASSERT(this->hasInval());