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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 CC_METRICS_SCROLL_JANK_DROPPED_FRAME_TRACKER_H_
#define CC_METRICS_SCROLL_JANK_DROPPED_FRAME_TRACKER_H_
#include <optional>
#include "base/time/time.h"
#include "cc/cc_export.h"
#include "cc/metrics/event_metrics.h"
#include "cc/metrics/scroll_jank_ukm_reporter.h"
namespace cc {
class ScrollJankUkmReporter;
class CC_EXPORT ScrollJankDroppedFrameTracker {
public:
ScrollJankDroppedFrameTracker();
~ScrollJankDroppedFrameTracker();
ScrollJankDroppedFrameTracker(const ScrollJankDroppedFrameTracker&) = delete;
void ReportLatestPresentationData(ScrollUpdateEventMetrics& earliest_event,
ScrollUpdateEventMetrics& latest_event,
base::TimeTicks last_input_generation_ts,
base::TimeTicks presentation_ts,
base::TimeDelta vsync_interval);
void OnScrollStarted();
void set_scroll_jank_ukm_reporter(
ScrollJankUkmReporter* scroll_jank_ukm_reporter) {
scroll_jank_ukm_reporter_ = scroll_jank_ukm_reporter;
}
static constexpr int kHistogramEmitFrequency = 64;
static constexpr const char* kDelayedFramesWindowHistogram =
"Event.ScrollJank.DelayedFramesPercentage.FixedWindow";
static constexpr const char* kDelayedFramesWindowV3Histogram =
"Event.ScrollJank.DelayedFramesPercentage.FixedWindow3";
static constexpr const char* kMissedVsyncsWindowHistogram =
"Event.ScrollJank.MissedVsyncsPercentage.FixedWindow";
static constexpr const char* kMissedVsyncsWindowV3Histogram =
"Event.ScrollJank.MissedVsyncsPercentage.FixedWindow3";
static constexpr const char* kDelayedFramesPerScrollHistogram =
"Event.ScrollJank.DelayedFramesPercentage.PerScroll";
static constexpr const char* kDelayedFramesPerScrollV3Histogram =
"Event.ScrollJank.DelayedFramesPercentage.PerScroll3";
static constexpr const char* kMissedVsyncsPerScrollHistogram =
"Event.ScrollJank.MissedVsyncsPercentage.PerScroll";
static constexpr const char* kMissedVsyncsPerScrollV3Histogram =
"Event.ScrollJank.MissedVsyncsPercentage.PerScroll3";
static constexpr const char* kMissedVsyncsSumInWindowHistogram =
"Event.ScrollJank.MissedVsyncsSum.FixedWindow";
static constexpr const char* kMissedVsyncsSumInVsyncWindowHistogram =
"Event.ScrollJank.MissedVsyncsSum.FixedWindow2";
static constexpr const char* kMissedVsyncsSumInWindowV3Histogram =
"Event.ScrollJank.MissedVsyncsSum.FixedWindow3";
static constexpr const char* kMissedVsyncsMaxInWindowHistogram =
"Event.ScrollJank.MissedVsyncsMax.FixedWindow";
static constexpr const char* kMissedVsyncsMaxInVsyncWindowHistogram =
"Event.ScrollJank.MissedVsyncsMax.FixedWindow2";
static constexpr const char* kMissedVsyncsMaxPerScrollHistogram =
"Event.ScrollJank.MissedVsyncsMax.PerScroll";
static constexpr const char* kMissedVsyncsSumPerScrollHistogram =
"Event.ScrollJank.MissedVsyncsSum.PerScroll";
static constexpr const char* kMissedVsyncsSumPerScrollV3Histogram =
"Event.ScrollJank.MissedVsyncsSum.PerScroll3";
static constexpr const char* kMissedVsyncsPerFrameHistogram =
"Event.ScrollJank.MissedVsyncs.PerFrame";
private:
void EmitPerWindowHistogramsAndResetCounters();
void EmitPerScrollHistogramsAndResetCounters();
void EmitPerVsyncWindowHistogramsAndResetCounters();
void EmitPerScrollVsyncHistogramsAndResetCounters();
void EmitPerWindowV3HistogramsAndResetCounters();
void EmitPerScrollV3HistogramsAndResetCounters();
void ReportLatestPresentationDataV3(
ScrollUpdateEventMetrics& earliest_event,
base::TimeTicks first_input_generation_v3_ts,
base::TimeTicks presentation_ts,
base::TimeDelta vsync_interval);
// We could have two different frames with same presentation time and due to
// this just having previous frame's data is not enough for calculating the
// metric.
base::TimeTicks prev_presentation_ts_;
base::TimeTicks prev_last_input_generation_ts_;
struct JankData {
// Number of frames which were deemed janky.
int missed_frames = 0;
// Number of vsyncs the frames were delayed by. Whenever a frame is missed
// it could be delayed >=1 vsyncs, this helps us track how "long" the janks
// are.
int missed_vsyncs = 0;
int max_missed_vsyncs = 0;
int num_presented_frames = 0;
int num_past_vsyncs = 0;
};
struct JankDataV3 {
// Number of frames which were deemed janky.
int missed_frames = 0;
// Number of vsyncs the frames were delayed by. Whenever a frame is missed
// it could be delayed >=1 vsyncs, this helps us track how "long" the janks
// are.
int missed_vsyncs = 0;
int num_presented_frames = 0;
int num_past_vsyncs = 0;
};
JankData fixed_window_;
// TODO(b/306611560): Cleanup experimental per vsync metric or promote to
// default.
JankData experimental_vsync_fixed_window_;
JankDataV3 fixed_window_v3_;
std::optional<JankData> per_scroll_;
std::optional<JankData> experimental_per_scroll_vsync_;
std::optional<JankDataV3> per_scroll_v3_;
raw_ptr<ScrollJankUkmReporter> scroll_jank_ukm_reporter_ = nullptr;
};
} // namespace cc
#endif // CC_METRICS_SCROLL_JANK_DROPPED_FRAME_TRACKER_H_
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