WIP: Surface Synchronization System

cc/surfaces/display_compositor_lock_manager.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 CC_SURFACES_DISPLAY_COMPOSITOR_LOCK_MANAGER_H_
+#define CC_SURFACES_DISPLAY_COMPOSITOR_LOCK_MANAGER_H_
+
+#include "cc/scheduler/begin_frame_source.h"
+#include "cc/surfaces/pending_surface_observer.h"
+#include "cc/surfaces/surface.h"
+#include "cc/surfaces/surface_observer.h"
+#include "cc/surfaces/surfaces_export.h"
+
+namespace cc {
+
+class SurfaceManager;
+
+class CC_SURFACES_EXPORT DisplayCompositorLockManager
+    : public BeginFrameObserver,
+      public PendingSurfaceObserver,
+      public SurfaceObserver {
+ public:
+  DisplayCompositorLockManager(SurfaceManager* surface_manager,
+                               BeginFrameSource* begin_frame_source);
+  ~DisplayCompositorLockManager() override;
+
+  void RequestSurfaceResolution(Surface* pending_surface);
+
+  bool observing_begin_frames() const { return observing_begin_frames_; }
+
+  // BeginFrameObserver implementation.
+  void OnBeginFrame(const BeginFrameArgs& args) override;
+  const BeginFrameArgs& LastUsedBeginFrameArgs() const override;
+  void OnBeginFrameSourcePausedChanged(bool paused) override;
+
+  // PendingSurfaceObserver implementation:
+  void OnSurfaceActivated(Surface* pending_surface) override;
+  void OnSurfaceChanged(
+      Surface* pending_surface,
+      const SurfaceDependencies& added_dependencies,
+      const SurfaceDependencies& removed_dependencies) override;
+  void OnSurfaceDiscarded(Surface* pending_surface) override;
+
+  // SurfaceObserver implementation:
+  void OnSurfaceCreated(const SurfaceInfo& surface_info) override;
+  void OnSurfaceDamaged(const SurfaceId& surface_id, bool* changed) override;
+
+ private:
+  void ReportSurfaceIdAvailable(const SurfaceId& surface_id);
+
+  SurfaceManager* const surface_manager_;
+
+  // The last begin frame args generated by the begin frame source.
+  BeginFrameArgs last_begin_frame_args_;
+
+  BeginFrameSource* begin_frame_source_;
+
+  // Whether or not a rame observer has been added.
+  bool observing_begin_frames_ = false;
+
+  uint32_t begin_frame_count_ = 0;
+
+  std::unordered_map<SurfaceId, PendingSurfaceSet, SurfaceIdHash>
+      blocking_surfaces_;
+
+  PendingSurfaceSet pending_surfaces_;
+
+  DISALLOW_COPY_AND_ASSIGN(DisplayCompositorLockManager);
+};
+
+}  // namespace cc
+
+#endif  // CC_SURFACES_DISPLAY_COMPOSITOR_LOCK_MANAGER_H_