fix(dde-blackwidget): align shutdown logo size with plymouth

[mhduiy]

1. Replicate plymouth's device-scale heuristic (physical DPI > 192 → 2) to size the logo
2. Read panel native resolution via XRandR preferred mode instead of Qt logical size
3. Scale logo by device-scale × (X resolution / native) so it stays consistent after resolution changes
4. Render the logo on every screen with each screen's own scale

Log: Align the shutdown black-screen logo size with plymouth on HiDPI and multi-screen setups
Influence: Shutdown logo matches plymouth at any resolution

fix(dde-blackwidget): 修复关机黑屏 logo 大小与 plymouth 不一致

1. 复刻 plymouth 的 device scale 判定（物理 DPI > 192 → 2）来确定 logo 尺寸
2. 用 XRandR 首选模式读取面板原生分辨率，替代 Qt 逻辑尺寸
3. 按 device scale × (X 分辨率 / 原生分辨率) 缩放 logo，降分辨率后仍与 plymouth 一致
4. 每个屏幕都渲染 logo，并按各屏自身缩放

Log: 修复关机黑屏 logo 在高分屏及多屏下与 plymouth 大小不一致的问题
PMS: BUG-377849
Influence: 关机 logo 在不同分辨率下均与 plymouth 对齐

Summary by Sourcery

Align shutdown logo rendering with Plymouth across display scaling, resolution, and multi-screen setups.

Bug Fixes:

• Align the shutdown black-screen logo with Plymouth across HiDPI displays, resolution changes, and multi-screen configurations.

Enhancements:

• Use display-native resolution and physical DPI to calculate per-screen logo sizing and render appropriately scaled logos on every connected screen.

Build:

• Add the XRandR dependency required for native display mode detection.

[sourcery-ai]

Reviewer's Guide

The PR aligns shutdown logos with Plymouth by deriving per-screen native resolution and HiDPI scale through XRandR/EDID data, compensating for runtime resolution changes, and rendering independently scaled logos across multi-screen cover windows.

Sequence diagram for per-screen shutdown logo rendering

sequenceDiagram
    participant BlackWidget
    participant QScreen
    participant XRandR
    participant ScreenLogo

    BlackWidget->>QScreen: makeLogoPixmap(screen)
    QScreen->>XRandR: nativeResolution(screen)
    XRandR-->>QScreen: preferred native mode
    QScreen-->>BlackWidget: device scale and resolution factor
    BlackWidget->>ScreenLogo: setPixmap(scaled logo)
    BlackWidget->>ScreenLogo: setFixedSize and center
    BlackWidget->>ScreenLogo: setVisible(m_logoVisible)

Loading

File-Level Changes

Change	Details	Files
Add XRandR-backed native-resolution detection and Plymouth-compatible DPI scaling for logo sizing.	Add the XRandR build dependency and headers. Resolve each connected screen’s preferred XRandR mode, with a Qt size/device-pixel-ratio fallback. Apply a device scale of 2 only for sufficiently high native resolution and physical DPI, then adjust for the current X resolution. Set pixmap device-pixel ratios and account for them when sizing the QLabel.	dde-blackwidget/CMakeLists.txt dde-blackwidget/src/window.cpp
Render and manage a separately scaled shutdown logo on every screen.	Create a logo QLabel for each cover window and position it at that screen’s center. Use each screen’s computed pixmap scale and device pixel ratio. Synchronize logo visibility with cover-window visibility and clean up logo mappings when windows are removed.	dde-blackwidget/src/window.cpp dde-blackwidget/src/window.h
Declare the new runtime/build dependency required for XRandR integration.	Add the XRandR package dependency to Debian control metadata.	debian/control

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[sourcery-ai]

Hey - I've found 1 issue

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location path="dde-blackwidget/src/window.cpp" line_range="248" />
<code_context>
         m_logo->setAccessibleName("BlackWidgetLogo");
         m_logo->setVisible(false);
-        QPixmap logoPixmap(plymouthLogoPath());
+        const QPixmap logoPixmap = makeLogoPixmap(qApp->primaryScreen());
         if (logoPixmap.isNull()) {
             qWarning() << "blackwidget logo pixmap is null";
</code_context>
<issue_to_address>
**issue (broader_impact):** The primary-screen logo is scaled only when it is first created, so after the primary screen, resolution, device pixel ratio, or preferred mode changes, the logo keeps the old screen's pixmap dimensions and no longer matches plymouth. `updateScreenWindows()` refreshes only the secondary-screen logos.

**Triggers:** When the display configuration changes after `setLogoVisible(true)` has created `m_logo`.

**Suggested fix:** Recreate or rescale `m_logo` for the current primary screen whenever screen geometry, DPR, or the preferred mode changes, alongside the secondary-screen refresh.
</issue_to_address>

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mhduiy, robertkill

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