1 // Copyright 2020 The Chromium Authors
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef CC_METRICS_AVERAGE_LAG_TRACKING_MANAGER_H_
6 #define CC_METRICS_AVERAGE_LAG_TRACKING_MANAGER_H_
11 #include "base/containers/circular_deque.h"
12 #include "cc/cc_export.h"
13 #include "cc/metrics/average_lag_tracker.h"
14 #include "cc/metrics/event_metrics.h"
17 struct FrameTimingDetails;
22 // A helper to decouple the `EventMetrics` and the `AverageLagTracker`.
23 class CC_EXPORT AverageLagTrackingManager {
25 AverageLagTrackingManager();
26 ~AverageLagTrackingManager();
28 // Disallow copy and assign.
29 AverageLagTrackingManager(const AverageLagTrackingManager&) = delete;
30 AverageLagTrackingManager& operator=(AverageLagTrackingManager const&) =
33 // Adds all the eligible events in the collection |infos| to the |frame_token|
35 void CollectScrollEventsFromFrame(uint32_t frame_token,
36 const EventMetricsSet& events_metrics);
38 // Sends all pending events in the |frame_token| list to the
39 // AverageLagTracker, given its |frame_details|.
40 void DidPresentCompositorFrame(uint32_t frame_token,
41 const viz::FrameTimingDetails& frame_details);
43 // Clears the list of events |frame_token_to_info_| if the current frames wont
44 // receive a presentation feedback (e.g. LayerTreeFrameSink loses context)
48 // Tracker for the AverageLagPresentation metrics that uses the presentation
49 // feedback time as an approximation for the time the users sees the frame on
51 AverageLagTracker lag_tracker_;
53 // List of events (vector) per frame (uint32_t |frame_token|) to submit to the
54 // lag trackers when DidPresentCompositorFrame is called for a |frame_token|.
56 std::pair<uint32_t, std::vector<AverageLagTracker::EventInfo>>>
62 #endif // CC_METRICS_AVERAGE_LAG_TRACKING_MANAGER_H_