Initial checkin of the new Mozart compositor.

services/gfx/compositor/scene_state.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_SCENE_STATE_H_
+#define SERVICES_GFX_COMPOSITOR_SCENE_STATE_H_
+
+#include <memory>
+#include <string>
+#include <unordered_map>
+#include <vector>
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "mojo/services/gfx/composition/cpp/formatting.h"
+#include "mojo/services/gfx/composition/interfaces/scenes.mojom.h"
+#include "services/gfx/compositor/graph/scene_def.h"
+
+namespace compositor {
+
+using SceneFrameCallback =
+    base::Callback<void(mojo::gfx::composition::FrameInfoPtr)>;
+
+// Describes the state of a particular scene.
+// This object is owned by the CompositorEngine that created it.
+class SceneState {
+ public:
+  SceneState(mojo::gfx::composition::SceneTokenPtr scene_token,
+             const std::string& label);
+  ~SceneState();
+
+  base::WeakPtr<SceneState> GetWeakPtr() { return weak_factory_.GetWeakPtr(); }
+
+  // Gets the token used to refer to this scene globally.
+  // Caller does not obtain ownership of the token.
+  mojo::gfx::composition::SceneToken* scene_token() {
+    return scene_def_.scene_token();
+  }
+
+  // Gets or sets the scene listener interface.
+  mojo::gfx::composition::SceneListener* scene_listener() {
+    return scene_listener_.get();
+  }
+  void set_scene_listener(mojo::gfx::composition::SceneListenerPtr listener) {
+    scene_listener_ = listener.Pass();
+  }
+
+  // Sets the associated scene implementation and takes ownership of it.
+  void set_scene_impl(mojo::gfx::composition::Scene* impl) {
+    scene_impl_.reset(impl);
+  }
+
+  // Gets the underlying scene definition, never null.
+  SceneDef* scene_def() { return &scene_def_; }
+
+  void AddSceneFrameCallback(const SceneFrameCallback& callback);
+  void DispatchSceneFrameCallbacks(
+      const mojo::gfx::composition::FrameInfo& frame_info);
+
+  const std::string& label() { return scene_def_.label(); }
+  std::string FormattedLabel() { return scene_def_.FormattedLabel(); }
+
+ private:
+  std::unique_ptr<mojo::gfx::composition::Scene> scene_impl_;
+  mojo::gfx::composition::SceneListenerPtr scene_listener_;
+  std::vector<SceneFrameCallback> pending_frame_callbacks_;
+
+  SceneDef scene_def_;
+
+  base::WeakPtrFactory<SceneState> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(SceneState);
+};
+
+std::ostream& operator<<(std::ostream& os, SceneState* scene_state);
+
+}  // namespace compositor
+
+#endif  // SERVICES_GFX_COMPOSITOR_SCENE_STATE_H_