Mozart: Implement hit testing.

services/gfx/compositor/graph/snapshot.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef SERVICES_GFX_COMPOSITOR_GRAPH_SNAPSHOT_H_
 #define SERVICES_GFX_COMPOSITOR_GRAPH_SNAPSHOT_H_
 
 #include <iosfwd>
 #include <memory>
 #include <unordered_map>
 #include <unordered_set>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "mojo/services/geometry/interfaces/geometry.mojom.h"
+#include "mojo/services/gfx/composition/interfaces/hit_tests.mojom.h"
 #include "mojo/services/gfx/composition/interfaces/scheduling.mojom.h"
 
 namespace compositor {
 
 class NodeDef;
 class SceneDef;
 class SceneContent;
 class SceneNodeDef;
 class RenderFrame;
 
@@ skipping 36 matching lines @@
   // Returns true if the snapshot has a dependency on content from the
   // specified scene.
   bool HasDependency(const SceneDef* scene) const;
 
   // Creates a frame for rendering.
   // Only valid if |!is_blocked()|.
   std::shared_ptr<RenderFrame> CreateFrame(
       const mojo::Rect& viewport,
       const mojo::gfx::composition::FrameInfo& frame_info) const;
 
+  // Performs a hit test at the specified point, populating the result.
+  // Only valid if |!is_blocked()|.
+  void HitTest(const mojo::Point& point,
+               mojo::gfx::composition::HitTestResult* result) const;
+
   // Returns true if the specified node was blocked from rendering.
   // Only valid if |!is_blocked()|.
   bool IsNodeBlocked(const NodeDef* node) const;
 
   // Gets the scene content which was resolved by following a scene node link.
   // Only valid if |!is_blocked()|.
   const SceneContent* GetResolvedSceneContent(
       const SceneNodeDef* scene_node) const;
 
  private:
@@ skipping 65 matching lines @@
   std::ostream* const block_log_;
   scoped_refptr<Snapshot> snapshot_;
   const SceneContent* cycle_ = nullptr;  // point where a cycle was detected
 
   DISALLOW_COPY_AND_ASSIGN(SnapshotBuilder);
 };
 
 }  // namespace compositor
 
 #endif  // SERVICES_GFX_COMPOSITOR_GRAPH_SNAPSHOT_H_