Mozart: Implement hit testing.

services/gfx/compositor/graph/scene_content.h

 // Copyright 2016 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_SCENE_CONTENT_H_
 #define SERVICES_GFX_COMPOSITOR_GRAPH_SCENE_CONTENT_H_
 
 #include <iosfwd>
 #include <unordered_map>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
+#include "mojo/services/gfx/composition/interfaces/hit_tests.mojom.h"
 #include "mojo/services/gfx/composition/interfaces/scenes.mojom.h"
 #include "services/gfx/compositor/graph/node_def.h"
 #include "services/gfx/compositor/graph/resource_def.h"
 #include "services/gfx/compositor/graph/scene_label.h"
 
+class SkCanvas;
+struct SkPoint;
+class SkMatrix;
+
 namespace compositor {
 
 class SceneContentBuilder;
 class SceneDef;
 
 // Represents the content of a particular published version of a scene.
 //
 // Holds a resource and node table which describes the content of a
 // scene as it was when a particular version was published.  Only the
 // internal state of the scene is described; links to other scenes are
@@ skipping 13 matching lines @@
   std::string FormattedLabel() const {
     return label_.FormattedLabelForVersion(version_);
   }
   std::string FormattedLabelForNode(uint32_t node_id) const {
     return label_.FormattedLabelForNode(version_, node_id);
   }
 
   // Gets the version of the scene represented by this object.
   uint32_t version() const { return version_; }
 
+  // Called to record drawing commands from a snapshot.
+  void RecordPicture(const Snapshot* snapshot, SkCanvas* canvas) const;
+
+  // Performs a hit test at the specified point.
+  // The |scene_point| is the hit tested point in the scene's coordinate space.
+  // The |global_to_scene_transform| is the accumulated transform from the
+  // global coordinate space to the scene's coordinate space.
+  // Provides hit information for the scene in |out_scene_hit| if any.
+  // Returns true if the search was terminated by an opaque hit.
+  bool HitTest(const Snapshot* snapshot,
+               const SkPoint& scene_point,
+               const SkMatrix& global_to_scene_transform,
+               mojo::gfx::composition::SceneHitPtr* out_scene_hit) const;
+
   // Gets the requested resource, never null because it must be present.
   const ResourceDef* GetResource(uint32_t resource_id,
                                  ResourceDef::Type resource_type) const;
 
   // Gets the requested node, never null because it must be present.
   const NodeDef* GetNode(uint32_t node_id) const;
 
   // Gets the root node if it exists, otherwise returns nullptr.
   const NodeDef* GetRootNodeIfExists() const;
 
@@ skipping 46 matching lines @@
   bool AddNode(const NodeDef* node);
 
   scoped_refptr<SceneContent> content_;
   const SceneDef* scene_;
   std::ostream& err_;
 };
 
 }  // namespace compositor
 
 #endif  // SERVICES_GFX_COMPOSITOR_GRAPH_SCENE_CONTENT_H_