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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ash/power/auto_screen_brightness/brightness_monitor_impl.h"
#include <algorithm>
#include <cmath>
#include "ash/constants/ash_features.h"
#include "base/check_op.h"
#include "base/functional/bind.h"
#include "base/memory/ptr_util.h"
#include "base/metrics/field_trial_params.h"
#include "base/metrics/histogram_macros.h"
#include "base/notreached.h"
#include "chrome/browser/ash/power/auto_screen_brightness/utils.h"
#include "chromeos/dbus/power/power_manager_client.h"
#include "chromeos/dbus/power_manager/backlight.pb.h"
namespace ash {
namespace power {
namespace auto_screen_brightness {
constexpr base::TimeDelta BrightnessMonitorImpl::kBrightnessSampleDelay;
BrightnessMonitorImpl::BrightnessMonitorImpl() = default;
BrightnessMonitorImpl::~BrightnessMonitorImpl() = default;
void BrightnessMonitorImpl::Init() {
const int brightness_sample_delay_seconds = GetFieldTrialParamByFeatureAsInt(
features::kAutoScreenBrightness, "brightness_sample_delay_seconds",
kBrightnessSampleDelay.InSeconds());
brightness_sample_delay_ =
brightness_sample_delay_seconds < 0
? kBrightnessSampleDelay
: base::Seconds(brightness_sample_delay_seconds);
power_manager_client_observation_.Observe(
chromeos::PowerManagerClient::Get());
}
void BrightnessMonitorImpl::AddObserver(
BrightnessMonitor::Observer* const observer) {
DCHECK(observer);
observers_.AddObserver(observer);
if (brightness_monitor_status_ != Status::kInitializing) {
observer->OnBrightnessMonitorInitialized(brightness_monitor_status_ ==
Status::kSuccess);
}
}
void BrightnessMonitorImpl::RemoveObserver(
BrightnessMonitor::Observer* const observer) {
DCHECK(observer);
observers_.RemoveObserver(observer);
}
void BrightnessMonitorImpl::PowerManagerBecameAvailable(
const bool service_is_ready) {
if (!service_is_ready) {
brightness_monitor_status_ = Status::kDisabled;
OnInitializationComplete();
return;
}
chromeos::PowerManagerClient::Get()->GetScreenBrightnessPercent(
base::BindOnce(&BrightnessMonitorImpl::OnReceiveInitialBrightnessPercent,
weak_ptr_factory_.GetWeakPtr()));
}
void BrightnessMonitorImpl::ScreenBrightnessChanged(
const power_manager::BacklightBrightnessChange& change) {
if (brightness_monitor_status_ != Status::kSuccess) {
// Either
// (1). we're waiting for init brightness to come in from powerd, or
// (2). we've failed to get init brightness from powerd.
// In any case, we ignore this brightness change.
return;
}
double brightness_percent_received = change.percent();
if (brightness_percent_received < 0.0 ||
brightness_percent_received > 100.0) {
// Brightness should not be outside the range of [0,100]. If it's outside
// this range after initialization completes successfully, we clip the value
// instead of throwing it away.
LogDataError(DataError::kBrightnessPercent);
brightness_percent_received =
std::clamp(brightness_percent_received, 0.0, 100.0);
}
if (change.cause() ==
power_manager::BacklightBrightnessChange_Cause_USER_REQUEST) {
// This is the only brightness change caused by explicit user selection.
NotifyUserBrightnessChangeRequested();
user_brightness_percent_ = brightness_percent_received;
StartBrightnessSampleTimer();
return;
}
// We treat all the other causes as non-user-initiated.
if (user_brightness_percent_) {
// If we've received a user-selected brightness change, stop waiting and
// report the latest |user_brightness_percent_|.
brightness_sample_timer_.Stop();
NotifyUserBrightnessChanged();
}
stable_brightness_percent_ = brightness_percent_received;
}
base::TimeDelta BrightnessMonitorImpl::GetBrightnessSampleDelayForTesting()
const {
return brightness_sample_delay_;
}
void BrightnessMonitorImpl::OnReceiveInitialBrightnessPercent(
const std::optional<double> brightness_percent) {
DCHECK_EQ(brightness_monitor_status_, Status::kInitializing);
if (brightness_percent && *brightness_percent >= 0.0 &&
*brightness_percent <= 100.0) {
// Brightness should not be outside the range of [0,100]. If it's outside
// this range on initialization, then we disable the monitor.
stable_brightness_percent_ = brightness_percent;
brightness_monitor_status_ = Status::kSuccess;
} else {
brightness_monitor_status_ = Status::kDisabled;
}
OnInitializationComplete();
}
void BrightnessMonitorImpl::OnInitializationComplete() {
DCHECK_NE(brightness_monitor_status_, Status::kInitializing);
UMA_HISTOGRAM_ENUMERATION("AutoScreenBrightness.BrightnessMonitorStatus",
brightness_monitor_status_);
const bool success = brightness_monitor_status_ == Status::kSuccess;
for (auto& observer : observers_)
observer.OnBrightnessMonitorInitialized(success);
}
void BrightnessMonitorImpl::StartBrightnessSampleTimer() {
// It's ok if the timer is already running, we simply wait a bit longer.
brightness_sample_timer_.Start(
FROM_HERE, brightness_sample_delay_, this,
&BrightnessMonitorImpl::NotifyUserBrightnessChanged);
}
void BrightnessMonitorImpl::NotifyUserBrightnessChanged() {
if (!user_brightness_percent_) {
NOTREACHED() << "User brightness adjustment missing on sample timeout";
}
for (auto& observer : observers_) {
observer.OnUserBrightnessChanged(stable_brightness_percent_.value(),
user_brightness_percent_.value());
}
stable_brightness_percent_ = user_brightness_percent_;
user_brightness_percent_ = std::nullopt;
}
void BrightnessMonitorImpl::NotifyUserBrightnessChangeRequested() {
for (auto& observer : observers_)
observer.OnUserBrightnessChangeRequested();
}
} // namespace auto_screen_brightness
} // namespace power
} // namespace ash
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