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// Copyright 2020 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_COMPOSITOR_THROUGHPUT_TRACKER_H_
#define UI_COMPOSITOR_THROUGHPUT_TRACKER_H_
#include "base/callback_forward.h"
#include "base/memory/weak_ptr.h"
#include "ui/compositor/compositor_export.h"
#include "ui/compositor/throughput_tracker_host.h"
namespace ui {
class Compositor;
class ThroughputTrackerHost;
// A class to track the throughput of Compositor. The tracking is identified by
// an id. The id is passed into impl side and be used as the sequence id to
// create and stop a kCustom typed cc::FrameSequenceTracker. The class is
// move-only to have only one holder of the id. When ThroughputTracker is
// destroyed with an active tracking, the tracking will be canceled and report
// callback will not be invoked.
class COMPOSITOR_EXPORT ThroughputTracker {
public:
using TrackerId = ThroughputTrackerHost::TrackerId;
// Move only.
ThroughputTracker(ThroughputTracker&& other);
ThroughputTracker& operator=(ThroughputTracker&& other);
~ThroughputTracker();
// Starts tracking Compositor and provides a callback for reporting. The
// throughput data collection starts after the next commit.
void Start(ThroughputTrackerHost::ReportCallback callback);
// Stops tracking. The supplied callback will be invoked when the data
// collection finishes after the next frame presentation. Note that no data
// will be reported if Stop() is not called,
void Stop();
// Cancels tracking. The supplied callback will not be invoked.
void Cancel();
private:
friend class Compositor;
// Private since it should only be created via Compositor's
// RequestNewThroughputTracker call.
ThroughputTracker(TrackerId id, base::WeakPtr<ThroughputTrackerHost> host);
static const TrackerId kInvalidId = 0u;
TrackerId id_ = kInvalidId;
base::WeakPtr<ThroughputTrackerHost> host_;
bool started_ = false;
};
} // namespace ui
#endif // UI_COMPOSITOR_THROUGHPUT_TRACKER_H_
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