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// Copyright 2020 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_HINT_SESSION_H_
#define COMPONENTS_VIZ_SERVICE_PERFORMANCE_HINT_HINT_SESSION_H_
#include <memory>
#include "base/containers/flat_set.h"
#include "base/threading/platform_thread.h"
#include "components/viz/service/viz_service_export.h"
namespace viz {
// This is a wrapper for the Android `android.os.PerformanceHintManager` APIs
// used to provide hints to the OS on rendering performance, so the OS can
// ramp CPU performance up or down on demand.
// This header is platform-agnostic though it's only implemented on Android
class VIZ_SERVICE_EXPORT HintSession {
public:
enum class BoostType {
kDefault,
kScrollBoost,
kWakeUpBoost,
};
enum class SessionType {
kAnimation = 0,
kRendererMain = 1,
};
virtual ~HintSession() = default;
virtual void UpdateTargetDuration(base::TimeDelta target_duration) = 0;
// `actual_duration` is compared to `target_duration` in `CreateSession` to
// determine the performance of a frame.
// 'preferable_boost_type' is a hint which mode to use. There is no guarantee
// that this mode will be used immediately or will be used at all.
virtual void ReportCpuCompletionTime(base::TimeDelta actual_duration,
base::TimeTicks draw_start,
BoostType preferable_boost_type) = 0;
virtual void SetThreads(
const base::flat_set<base::PlatformThreadId>& thread_ids) = 0;
};
class VIZ_SERVICE_EXPORT HintSessionFactory {
public:
// `permanent_thread_ids` are thread IDs that will be present in all
// HintSessions.
// Can return nullptr which can be used as feature detection.
static std::unique_ptr<HintSessionFactory> Create(
base::flat_set<base::PlatformThreadId> permanent_thread_ids);
virtual ~HintSessionFactory() = default;
// For animation (SessionType::kAnimation) sessions, `transient_thread_ids`
// are added to `permanent_thread_ids` to create this session. Changing
// `transient_thread_ids` still requires deleting and recreating the session.
// `target_duration` is compared to `actual_duration` in
// `ReportCpuCompletionTime` to determine the performance of a frame.
//
// For renderer main (SessionType::kRendererMain) sessions, the session
// includes only `transient_thread_ids`. These sessions never send any timing
// hints, i.e. `ReportCpuCompletionTime` calls are no-op.
virtual std::unique_ptr<HintSession> CreateSession(
base::flat_set<base::PlatformThreadId> transient_thread_ids,
base::TimeDelta target_duration,
HintSession::SessionType type) = 0;
// Issue an early hint to wake up some session.
virtual void WakeUp() = 0;
// Returns the full list of threads for the given session type.
// For animation (SessionType::kAnimation) sessions, this is a union of
// `transient_thread_ids` and `permanent_thread_ids_`.
// For renderer main (SessionType::kRendererMain) sessions, this is just
// `transient_thread_ids`.
virtual base::flat_set<base::PlatformThreadId> GetSessionThreadIds(
base::flat_set<base::PlatformThreadId> transient_thread_ids,
HintSession::SessionType type) = 0;
};
} // namespace viz
#endif // COMPONENTS_VIZ_SERVICE_PERFORMANCE_HINT_HINT_SESSION_H_
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