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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_VIZ_SERVICE_PERFORMANCE_HINT_BOOST_MANAGER_H_
#define COMPONENTS_VIZ_SERVICE_PERFORMANCE_HINT_BOOST_MANAGER_H_
#include "base/metrics/field_trial_params.h"
#include "components/viz/common/features.h"
#include "components/viz/service/performance_hint/hint_session.h"
namespace viz {
class VIZ_SERVICE_EXPORT BoostManager {
public:
// Recalculate an actual frame duration based on the current boost type. This
// is useful to speculate with the behavior of ADPF.
//
// This function consists of two steps:
//
// 1) Maybe update a boost type based on |preferable_boost_type| (read the
// description of the |MaybeUpdateBoostType| function).
//
// 2) Recalculate an actual frame duration based on the reasulted boost type
// from the previous step.
// - If the boost type = kDefault, it returns the |actual_duration|
// without any changes.
// - If the boost type = kScrollBoost or kWakeUpBoost, it returns a
// fictitious duration that is greater than |target_duration|, to emulate the
// behavior where a frame was missed.
base::TimeDelta GetFrameDurationAndMaybeUpdateBoostType(
base::TimeDelta target_duration,
base::TimeDelta actual_duration,
base::TimeTicks draw_start,
HintSession::BoostType preferable_boost_type);
protected:
HintSession::BoostType GetCurrentBoostTypeForTesting() const {
return boost_type_;
}
private:
// Updates the boost type:
// - kDefault takes effect after kScrollBoost or kWakeUpBoost expires. They
// expire |features::kADPFBoostModeDuration| after it was set.
// - kScrollBoost or kWakeUpBoost takes effect immediately.
void MaybeUpdateBoostType(base::TimeTicks draw_start,
HintSession::BoostType boost_type);
base::TimeTicks boost_end_time_ = base::TimeTicks::Min();
HintSession::BoostType boost_type_ = HintSession::BoostType::kDefault;
};
} // namespace viz
#endif // COMPONENTS_VIZ_SERVICE_PERFORMANCE_HINT_BOOST_MANAGER_H_
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