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// Copyright 2017 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 UI_LATENCY_LATENCY_TRACKER_H_
#define UI_LATENCY_LATENCY_TRACKER_H_
#include "base/callback_forward.h"
#include "base/macros.h"
#include "ui/latency/latency_info.h"
namespace ui {
// Utility class for tracking the latency of events. Relies on LatencyInfo
// components logged by content::RenderWidgetHostLatencyTracker.
class LatencyTracker {
public:
LatencyTracker();
~LatencyTracker();
// Terminates latency tracking for events that triggered rendering, also
// performing relevant UMA latency reporting.
// Called when GPU buffers swap completes.
void OnGpuSwapBuffersCompleted(
const std::vector<LatencyInfo>& latency_info,
bool top_controls_visible_height_changed = false);
private:
enum class InputMetricEvent {
SCROLL_BEGIN_TOUCH = 0,
SCROLL_UPDATE_TOUCH,
SCROLL_BEGIN_WHEEL,
SCROLL_UPDATE_WHEEL,
INPUT_METRIC_EVENT_MAX = SCROLL_UPDATE_WHEEL
};
void OnGpuSwapBuffersCompleted(const LatencyInfo& latency,
bool top_controls_visible_height_changed);
void ReportUkmScrollLatency(
const InputMetricEvent& metric_event,
base::TimeTicks start_timestamp,
base::TimeTicks time_to_scroll_update_swap_begin_timestamp,
base::TimeTicks time_to_handled_timestamp,
bool is_main_thread,
const ukm::SourceId ukm_source_id);
void ComputeEndToEndLatencyHistograms(
base::TimeTicks gpu_swap_begin_timestamp,
base::TimeTicks gpu_swap_end_timestamp,
const LatencyInfo& latency,
bool top_controls_visible_height_changed);
DISALLOW_COPY_AND_ASSIGN(LatencyTracker);
};
} // namespace latency
#endif // UI_LATENCY_LATENCY_TRACKER_H_
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