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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_EXO_FRAME_TIMING_HISTORY_H_
#define COMPONENTS_EXO_FRAME_TIMING_HISTORY_H_
#include <map>
#include "base/containers/small_map.h"
#include "base/time/time.h"
#include "cc/base/rolling_time_delta_history.h"
#include "components/viz/common/frame_sinks/begin_frame_args.h"
namespace exo {
// Records timing history of compositor frames and reports related metrics. Used
// by LayerTreeFrameSinkHolder to determine when to respond to BeginFrames.
class FrameTimingHistory {
public:
FrameTimingHistory();
FrameTimingHistory(const FrameTimingHistory&) = delete;
FrameTimingHistory& operator=(const FrameTimingHistory&) = delete;
~FrameTimingHistory();
// Estimates the duration from LayerTreeFrameSinkHolder submitting a frame to
// the remote side receiving it.
base::TimeDelta GetFrameTransferDurationEstimate() const;
// Notifies that a BeginFrame arrives.
void BeginFrameArrived(const viz::BeginFrameId& id);
// Notifies that a frame arrives.
void FrameArrived();
// Notifies that a frame is submitted to the remote side.
void FrameSubmitted(const viz::BeginFrameId& begin_frame_id,
uint32_t frame_token);
// Notifies that a BeginFrame is responded with DidNotProduceFrame.
void FrameDidNotProduce(const viz::BeginFrameId& begin_frame_id);
// Notifies that a frame is received at the remote side.
void FrameReceivedAtRemoteSide(uint32_t frame_token,
base::TimeTicks received_time);
// Notifies that a frame is discarded locally.
void FrameDiscarded();
// Records a value for DidNotProduceToFrameArrival histogram if applicable.
// For each DidNotProduceFrame response, the first call to this method
// reports one value; the subsequent calls (if any) are ignored.
// - `valid` set to false indicates that (1) DidNotProduceFrame is issued
// when there are already queued BeginFrames; or (2) a new BeginFrame
// arrives before the next frame; or (3) BeginFrames are paused. In this
// case the value reported is 0.
// - `valid` set to true: called at the next frame arrival time, reporting
// the duration between sending the DidNotProduceFrame response and the
// next frame arrival.
void MayRecordDidNotProduceToFrameArrvial(bool valid);
// The number of DidNotProduceFrame responses since the last time when a frame
// is submitted.
int32_t consecutive_did_not_produce_count() const {
return consecutive_did_not_produce_count_;
}
private:
void RecordFrameResponseToRemote(const viz::BeginFrameId& begin_frame_id,
bool did_not_produce,
base::TimeTicks response_time);
void RecordFrameHandled(bool discarded);
base::TimeTicks last_frame_arrival_time_;
base::small_map<std::map<uint32_t, base::TimeTicks>> pending_submitted_time_;
base::small_map<std::map<viz::BeginFrameId, base::TimeTicks>>
begin_frame_arrival_time_;
cc::RollingTimeDeltaHistory frame_transfer_duration_history_;
// Records the time of sending the last DidNotProduceFrame response. It is
// used to report DidNotProduceToFrameArrival metric and then reset.
base::TimeTicks last_did_not_produce_time_;
int32_t consecutive_did_not_produce_count_ = 0;
// Counters used to report metrics.
int32_t frame_response_count_ = 0;
int32_t frame_response_did_not_produce_ = 0;
int32_t frame_handling_count_ = 0;
int32_t frame_handling_discarded_ = 0;
};
} // namespace exo
#endif // COMPONENTS_EXO_FRAME_TIMING_HISTORY_H_
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