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OpenHarmony系統(tǒng)解決方案 - 接入多個(gè)顯示設(shè)備卡開機(jī)Logo

作者：TiZizzz
系統(tǒng) OpenHarmony
在窗口子系統(tǒng)中AbstractDisplayController控制器的初始化與屏幕連接事件的接收存在時(shí)序問題，啟動(dòng)成功時(shí)窗口子系統(tǒng)收到屏幕連接事件的時(shí)機(jī)均在AbstractDisplayController控制器的初始化之后，所以可以正常進(jìn)入系統(tǒng)。

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問題描述

問題環(huán)境

系統(tǒng)版本：OpenHarmony-3.2-Release。

問題現(xiàn)象

接入多個(gè)顯示設(shè)備后，啟動(dòng)系統(tǒng)偶現(xiàn)卡開機(jī)Logo。

異常效果：

系統(tǒng)卡在開機(jī)Logo界面，長時(shí)間無法顯示開機(jī)動(dòng)畫，并且無法進(jìn)入系統(tǒng)。

OpenHarmony系統(tǒng)解決方案 - 接入多個(gè)顯示設(shè)備卡開機(jī)Logo-開源基礎(chǔ)軟件社區(qū)OpenHarmony系統(tǒng)解決方案 - 接入多個(gè)顯示設(shè)備卡開機(jī)Logo-開源基礎(chǔ)軟件社區(qū)

正常效果：

系統(tǒng)啟動(dòng)成功，顯示開機(jī)動(dòng)畫，開機(jī)動(dòng)畫結(jié)束后顯示鎖屏界面。

OpenHarmony系統(tǒng)解決方案 - 接入多個(gè)顯示設(shè)備卡開機(jī)Logo-開源基礎(chǔ)軟件社區(qū)OpenHarmony系統(tǒng)解決方案 - 接入多個(gè)顯示設(shè)備卡開機(jī)Logo-開源基礎(chǔ)軟件社區(qū)

問題原因

  • 在窗口子系統(tǒng)中AbstractDisplayController控制器的初始化與屏幕連接事件的接收存在時(shí)序問題，啟動(dòng)成功時(shí)窗口子系統(tǒng)收到屏幕連接事件的時(shí)機(jī)均在AbstractDisplayController控制器的初始化之后，所以可以正常進(jìn)入系統(tǒng)。
  • 當(dāng)先接收到屏幕連接事件，再進(jìn)行AbstractDisplayController控制器的初始化操作時(shí)，則會(huì)由于OnAbstractScreenConnect函數(shù)的處理邏輯導(dǎo)致設(shè)置默認(rèn)屏幕操作失敗。

解決方案

修改默認(rèn)屏幕設(shè)置條件，解決AbstractDisplayController控制器加載慢于Display通知屏幕連接事件時(shí)，造成的無法設(shè)置默認(rèn)屏幕問題。

修改文件：foundation/window/window_manager/dmserver/src/abstract_display_controller.cpp

AbstractDisplayController::OnAbstractScreenConnect函數(shù)中，將以下代碼：

if (group->combination_ == ScreenCombination::SCREEN_ALONE || group->GetChildCount() == 1) {

替換為：

ScreenId dmsScreenId = abstractScreenController_->GetDefaultAbstractScreenId();
sptr<AbstractDisplay> display = GetAbstractDisplayByScreen(dmsScreenId);
if (group->combination_ == ScreenCombination::SCREEN_ALONE || group->GetChildCount() == 1 || display == nullptr) {

替換后完整函數(shù)代碼：

void AbstractDisplayController::OnAbstractScreenConnect(sptr<AbstractScreen> absScreen)
{
    if (absScreen == nullptr) {
        WLOGFE("absScreen is null");
        return;
    }
    WLOGI("connect new screen. id:%{public}" PRIu64"", absScreen->dmsId_);
    std::lock_guard<std::recursive_mutex> lock(mutex_);
    sptr<AbstractScreenGroup> group = absScreen->GetGroup();
    if (group == nullptr) {
        WLOGE("the group information of the screen is wrong");
        return;
    }
    ScreenId dmsScreenId = abstractScreenController_->GetDefaultAbstractScreenId();
    sptr<AbstractDisplay> display = GetAbstractDisplayByScreen(dmsScreenId);
    if (group->combination_ == ScreenCombination::SCREEN_ALONE || group->GetChildCount() == 1 || display == nullptr) {
        BindAloneScreenLocked(absScreen);
    } else if (group->combination_ == ScreenCombination::SCREEN_MIRROR) {
        WLOGI("OnAbstractScreenConnect, ScreenCombination::SCREEN_MIRROR, AddScreenToMirrorLocked");
        AddScreenToMirrorLocked(absScreen);
    } else if (group->combination_ == ScreenCombination::SCREEN_EXPAND) {
        WLOGI("OnAbstractScreenConnect, ScreenCombination::SCREEN_EXPAND, AddScreenToExpandLocked");
        AddScreenToExpandLocked(absScreen);
    } else {
        WLOGE("support in future. combination:%{public}u", group->combination_);
    }
}

定位過程

落盤異常開機(jī)日志，發(fā)現(xiàn)Launcher和SystemUI等系統(tǒng)應(yīng)用在啟動(dòng)過程中報(bào)錯(cuò)，無法獲取DefaultDisplayInfo。

08-05 17:18:29.046   521  1088 D C04201/AbstractScreenController: <177>GetDefaultAbstractScreenId: GetDefaultAbstractScreenId, screen:0
08-05 17:18:29.046   521  1088 D C04201/DisplayManagerService: <190>GetDefaultDisplayInfo: GetDefaultDisplayInfo 0
08-05 17:18:29.046   521  1088 E C04201/AbstractDisplayController: <105>GetAbstractDisplayByScreen: fail to get AbstractDisplay 0
08-05 17:18:29.047   521  1088 E C04201/DisplayManagerService: <193>GetDefaultDisplayInfo: fail to get displayInfo by id: invalid display
08-05 17:18:29.047   240  1090 I C01800/SAMGR: SystemAbilityManagerStub::OnReceived, code = 12, callerPid = 1156, flags= 0
08-05 17:18:29.047  1156  1156 W C04201/DisplayManagerProxy: <52>GetDefaultDisplayInfo: DisplayManagerProxy::GetDefaultDisplayInfo SendRequest nullptr.
08-05 17:18:29.047  1156  1156 D C03f00/ArkCompiler: [ecmascript] Throw error: JsDisplayManager::OnGetDefaultDisplay failed.

查找默認(rèn)屏幕設(shè)置邏輯，追蹤Log發(fā)現(xiàn)默認(rèn)屏幕信息從abstractDisplayMap_中獲取。

// foundation/window/window_manager/dmserver/src/abstract_display_controller.cpp
sptr<AbstractDisplay> AbstractDisplayController::GetAbstractDisplayByScreen(ScreenId screenId) const
{
    if (screenId == SCREEN_ID_INVALID) {
        WLOGFE("screen id is invalid.");
        return nullptr;
    }
    std::lock_guard<std::recursive_mutex> lock(mutex_);
    for (auto iter : abstractDisplayMap_) {
        sptr<AbstractDisplay> display = iter.second;
        if (display->GetAbstractScreenId() == screenId) {
            return display;
        }
    }
    WLOGFE("fail to get AbstractDisplay %{public}" PRIu64"", screenId);
    return nullptr;
}

abstractDisplayMap_對(duì)象會(huì)在兩個(gè)位置被insert數(shù)據(jù)，BindAloneScreenLocked函數(shù)和AddScreenToExpandLocked函數(shù)。而兩個(gè)函數(shù)擁有同一個(gè)入口函數(shù)AbstractDisplayController::OnAbstractScreenConnect。

// foundation/window/window_manager/dmserver/src/abstract_display_controller.cpp
void AbstractDisplayController::OnAbstractScreenConnect(sptr<AbstractScreen> absScreen)
{
    if (absScreen == nullptr) {
        WLOGFE("absScreen is null");
        return;
    }
    WLOGI("connect new screen. id:%{public}" PRIu64"", absScreen->dmsId_);
    std::lock_guard<std::recursive_mutex> lock(mutex_);
    sptr<AbstractScreenGroup> group = absScreen->GetGroup();
    if (group == nullptr) {
        WLOGE("the group information of the screen is wrong");
        return;
    }
    if (group->combination_ == ScreenCombination::SCREEN_ALONE || group->GetChildCount() == 1) {
        BindAloneScreenLocked(absScreen);
    } else if (group->combination_ == ScreenCombination::SCREEN_MIRROR) {
        WLOGI("OnAbstractScreenConnect, ScreenCombination::SCREEN_MIRROR, AddScreenToMirrorLocked");
        AddScreenToMirrorLocked(absScreen);
    } else if (group->combination_ == ScreenCombination::SCREEN_EXPAND) {
        WLOGI("OnAbstractScreenConnect, ScreenCombination::SCREEN_EXPAND, AddScreenToExpandLocked");
        AddScreenToExpandLocked(absScreen);
    } else {
        WLOGE("support in future. combination:%{public}u", group->combination_);
    }
}

查看源碼對(duì)應(yīng)Log，發(fā)現(xiàn)異常情況下屏幕OnAbstractScreenConnect函數(shù)的執(zhí)行操作是一起完成的，此時(shí)ScrrenID為0的屏幕ScreenCombination屬性為ScreenCombination::SCREEN_MIRROR。而在正常情況下OnAbstractScreenConnect函數(shù)是分開執(zhí)行的。

異常Log：

08-05 17:18:26.923   521   923 I C04201/AbstractDisplayController: <152>connect new screen. id:0
08-05 17:18:26.923   521   923 I C04201/AbstractDisplayController: <162>OnAbstractScreenConnect, ScreenCombination::SCREEN_MIRROR, AddScreenToMirrorLocked
08-05 17:18:26.923   521   656 I C04201/AbstractScreenController: <1161>operator(): screenId:2, trigger:[foundation]
08-05 17:18:26.923   332   430 I C01799/MemMgr: MultiAccountManager::Init The manager initial succeed, accountCount = 0.
08-05 17:18:26.923   521   923 I C04201/AbstractDisplayController: <558>bind display to mirror. screen:0
08-05 17:18:26.923   521   656 I C04200/ClientAgentContainer: <98>GetAgentsByType: no such type of agent registered! type:2
08-05 17:18:26.923   521   923 I C04201/AbstractScreenController: <203>RegisterAbstractScreenCallback: dmsScreenId :1
08-05 17:18:26.923   521   923 I C04201/AbstractDisplayController: <152>connect new screen. id:1
08-05 17:18:26.923   521   923 E C04201/AbstractScreenController: <159>did not find screen:18446744073709551615
08-05 17:18:26.923   521   923 E C04201/AbstractDisplayController: <156>the group information of the screen is wrong
08-05 17:18:26.923   521   923 I C04201/AbstractScreenController: <203>RegisterAbstractScreenCallback: dmsScreenId :2
08-05 17:18:26.923   521   923 I C04201/AbstractDisplayController: <152>connect new screen. id:2
08-05 17:18:26.923   521   923 I C04201/AbstractDisplayController: <162>OnAbstractScreenConnect, ScreenCombination::SCREEN_MIRROR, AddScreenToMirrorLocked
08-05 17:18:26.923   521   923 I C04201/AbstractDisplayController: <558>bind display to mirror. screen:2

正常Log：

08-05 17:23:07.081   547   770 I C04201/AbstractDisplayController: <152>connect new screen. id:0
08-05 17:23:07.081   547   770 D C04201/AbstractScreenController: <177>GetDefaultAbstractScreenId: GetDefaultAbstractScreenId, screen:0

08-05 17:23:07.088   547   770 I C04201/AbstractDisplayController: <152>connect new screen. id:2
08-05 17:23:07.088   547   770 I C04201/AbstractDisplayController: <162>OnAbstractScreenConnect, ScreenCombination::SCREEN_MIRROR, AddScreenToMirrorLocked
08-05 17:23:07.088   547   770 I C04201/AbstractDisplayController: <558>bind display to mirror. screen:2

查看OnAbstractScreenConnect的觸發(fā)邏輯有兩種。

第一種，AbstractDisplayController初始化時(shí)注冊(cè)屏幕事件回調(diào)，注冊(cè)后遍歷dmsScreenMap_調(diào)用AbstractDisplayController::OnAbstractScreenConnect初始化在回調(diào)注冊(cè)前記錄的屏幕數(shù)據(jù)。

// foundation/window/window_manager/dmserver/src/abstract_screen_controller.cpp
void AbstractDisplayController::Init(sptr<AbstractScreenController> abstractScreenController)
{
    WLOGFD("display controller init");
    displayCount_ = 0;
    abstractScreenController_ = abstractScreenController;
    abstractScreenCallback_ = new(std::nothrow) AbstractScreenController::AbstractScreenCallback();
    if (abstractScreenCallback_ == nullptr) {
        WLOGFE("abstractScreenCallback init failed");
        return;
    }
    abstractScreenCallback_->onConnect_
        = std::bind(&AbstractDisplayController::OnAbstractScreenConnect, this, std::placeholders::_1);
    abstractScreenCallback_->onDisconnect_
        = std::bind(&AbstractDisplayController::OnAbstractScreenDisconnect, this, std::placeholders::_1);
    abstractScreenCallback_->onChange_
        = std::bind(&AbstractDisplayController::OnAbstractScreenChange, this, std::placeholders::_1,
        std::placeholders::_2);
    abstractScreenController->RegisterAbstractScreenCallback(abstractScreenCallback_);
}

void AbstractScreenController::RegisterAbstractScreenCallback(sptr<AbstractScreenCallback> cb)
{
    std::lock_guard<std::recursive_mutex> lock(mutex_);
    abstractScreenCallback_ = cb;
    for (auto& iter : dmsScreenMap_) {
        if (iter.second != nullptr && abstractScreenCallback_ != nullptr) {
            WLOGFI("dmsScreenId :%{public}" PRIu64"", iter.first);
            abstractScreenCallback_->onConnect_(iter.second);
        }
    }
}

第二種，當(dāng)窗口子系統(tǒng)觸發(fā)OnRsScreenConnectionChange回調(diào)時(shí)，會(huì)調(diào)用ProcessScreenConnected函數(shù)。如果abstractScreenCallback_回調(diào)函數(shù)注冊(cè)則執(zhí)行AbstractDisplayController::OnAbstractScreenConnect。

// foundation/window/window_manager/dmserver/src/abstract_screen_controller.cpp
void AbstractScreenController::OnRsScreenConnectionChange(ScreenId rsScreenId, ScreenEvent screenEvent)
{
    WLOGFI("rs screen event. id:%{public}, event:%{public}u", rsScreenId, static_cast<uint32_t>(screenEvent));
    if (screenEvent == ScreenEvent::CONNECTED) {
        auto task = [this, rsScreenId] {
            ProcessScreenConnected(rsScreenId);
        };
        controllerHandler_->PostTask(task, AppExecFwk::EventQueue::Priority::HIGH);
    }
    ···
}

void AbstractScreenController::ProcessScreenConnected(ScreenId rsScreenId)
{
    std::lock_guard<std::recursive_mutex> lock(mutex_);
    if (screenIdManager_.HasRsScreenId(rsScreenId)) {
        WLOGE("reconnect screen, screenId=%{public}" PRIu64"", rsScreenId);
        return;
    }
    WLOGFD("connect new screen");
    auto absScreen = InitAndGetScreen(rsScreenId);
    if (absScreen == nullptr) {
        return;
    }
    sptr<AbstractScreenGroup> screenGroup = AddToGroupLocked(absScreen);
    if (screenGroup == nullptr) {
        return;
    }
    ···
    if (abstractScreenCallback_ != nullptr) {
        abstractScreenCallback_->onConnect_(absScreen);
    }
    ···
}

如果OnAbstractScreenConnect在第二種情況執(zhí)行，加載第一個(gè)屏幕時(shí)，則在group->GetChildCount() == 1時(shí)進(jìn)入判斷，執(zhí)行BindAloneScreenLocked(absScreen);函數(shù)，系統(tǒng)正常運(yùn)行。

如果OnAbstractScreenConnect在第一種情況執(zhí)行，加載第一個(gè)屏幕時(shí)，會(huì)創(chuàng)建screenGroup。創(chuàng)建的group也會(huì)insert進(jìn)dmsScreenMap_，此操作會(huì)導(dǎo)致異常Log中ScreenId為1的屏幕綁定異常。

// foundation/window/window_manager/dmserver/src/abstract_screen_controller.cpp
sptr<AbstractScreenGroup> AbstractScreenController::AddToGroupLocked(sptr<AbstractScreen> newScreen)
{
    sptr<AbstractScreenGroup> res;
    if (dmsScreenGroupMap_.empty()) {
        WLOGI("connect the first screen");
        // 第一塊顯示設(shè)備連接時(shí)進(jìn)入
        res = AddAsFirstScreenLocked(newScreen); 
    } else {
        // 后續(xù)顯示設(shè)備連接時(shí)進(jìn)入
        res = AddAsSuccedentScreenLocked(newScreen);
    }
    return res;
}
sptr<AbstractScreenGroup> AbstractScreenController::AddAsFirstScreenLocked(sptr<AbstractScreen> newScreen)
{
    ScreenId dmsGroupScreenId = screenIdManager_.CreateAndGetNewScreenId(SCREEN_ID_INVALID);
    ···
    dmsScreenGroupMap_.insert(std::make_pair(dmsGroupScreenId, screenGroup));
    dmsScreenMap_.insert(std::make_pair(dmsGroupScreenId, screenGroup));
    ···
}

當(dāng)?shù)诙K顯示設(shè)備連接時(shí)，尋找第一塊設(shè)備創(chuàng)建的group，并把自己添加進(jìn)group中。

// foundation/window/window_manager/dmserver/src/abstract_screen_controller.cpp
sptr<AbstractScreenGroup> AbstractScreenController::AddAsSuccedentScreenLocked(sptr<AbstractScreen> newScreen)
{
    ScreenId defaultScreenId = GetDefaultAbstractScreenId();
    auto iter = dmsScreenMap_.find(defaultScreenId);
    if (iter == dmsScreenMap_.end()) {
        WLOGE("AddAsSuccedentScreenLocked. defaultScreenId:%{public}" PRIu64" is not in dmsScreenMap_.",
            defaultScreenId);
        return nullptr;
    }
    auto screen = iter->second;
    auto screenGroupIter = dmsScreenGroupMap_.find(screen->groupDmsId_);
    if (screenGroupIter == dmsScreenGroupMap_.end()) {
        WLOGE("AddAsSuccedentScreenLocked. groupDmsId:%{public}" PRIu64" is not in dmsScreenGroupMap_.",
            screen->groupDmsId_);
        return nullptr;
    }
    auto screenGroup = screenGroupIter->second;
    Point point;
    if (screenGroup->combination_ == ScreenCombination::SCREEN_EXPAND) {
        point = {screen->GetActiveScreenMode()->width_, 0};
    }
    screenGroup->AddChild(newScreen, point);
    return screenGroup;
}

當(dāng)OnAbstractScreenConnect被執(zhí)行時(shí)，獲取到ScreenID為0的Group，此時(shí)Group內(nèi)的屏幕數(shù)為2，所以無法進(jìn)入BindAloneScreenLocked函數(shù)所在的判斷，造成異常。

// foundation/window/window_manager/dmserver/src/abstract_display_controller.cpp
void AbstractDisplayController::OnAbstractScreenConnect(sptr<AbstractScreen> absScreen)
{
    if (absScreen == nullptr) {
        WLOGFE("absScreen is null");
        return;
    }
    WLOGI("connect new screen. id:%{public}" PRIu64"", absScreen->dmsId_);
    std::lock_guard<std::recursive_mutex> lock(mutex_);
    sptr<AbstractScreenGroup> group = absScreen->GetGroup();
    if (group == nullptr) {
        WLOGE("the group information of the screen is wrong");
        return;
    }
    if (group->combination_ == ScreenCombination::SCREEN_ALONE || group->GetChildCount() == 1) {
        BindAloneScreenLocked(absScreen);
    } else if (group->combination_ == ScreenCombination::SCREEN_MIRROR) {
        WLOGI("OnAbstractScreenConnect, ScreenCombination::SCREEN_MIRROR, AddScreenToMirrorLocked");
        AddScreenToMirrorLocked(absScreen);
    } else if (group->combination_ == ScreenCombination::SCREEN_EXPAND) {
        WLOGI("OnAbstractScreenConnect, ScreenCombination::SCREEN_EXPAND, AddScreenToExpandLocked");
        AddScreenToExpandLocked(absScreen);
    } else {
        WLOGE("support in future. combination:%{public}u", group->combination_);
    }
}

想了解更多關(guān)于開源的內(nèi)容，請(qǐng)?jiān)L問：

51CTO 開源基礎(chǔ)軟件社區(qū)

https://ost.51cto.com

責(zé)任編輯：jianghua 來源： 51CTO 開源基礎(chǔ)軟件社區(qū)
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