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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CC_METRICS_EVENT_LATENCY_TRACKER_H_
#define CC_METRICS_EVENT_LATENCY_TRACKER_H_
#include <variant>
#include <vector>
#include "base/time/time.h"
#include "cc/cc_export.h"
#include "cc/metrics/event_metrics.h"
namespace cc {
// Used by `CompositorFrameReporter` to report event latency information back to
// `LayerTreeHostImpl` and eventually to UI compositor.
class CC_EXPORT EventLatencyTracker {
public:
struct CC_EXPORT LatencyData {
LatencyData(EventMetrics::EventType event_type,
base::TimeDelta total_latency);
~LatencyData();
LatencyData(const LatencyData&) = delete;
LatencyData& operator=(const LatencyData&) = delete;
LatencyData(LatencyData&&);
LatencyData& operator=(LatencyData&&);
EventMetrics::EventType event_type;
base::TimeDelta total_latency;
// Type of the input device if the event is a scroll or a pinch event.
std::variant<std::monostate,
ScrollEventMetrics::ScrollType,
PinchEventMetrics::PinchType>
input_type;
};
EventLatencyTracker();
virtual ~EventLatencyTracker();
EventLatencyTracker(const EventLatencyTracker&) = delete;
EventLatencyTracker& operator=(const EventLatencyTracker&) = delete;
// Called every time a frame has latency metrics to report for events.
virtual void ReportEventLatency(std::vector<LatencyData> latencies) = 0;
};
} // namespace cc
#endif // CC_METRICS_EVENT_LATENCY_TRACKER_H_
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