fix(clipboard): fix jagged image under fractional scaling

[MyLeeJiEun]

1. Include QGuiApplication header for qGuiApp global pointer
2. Reduce border width from 4.0 to 3.0 for cleaner appearance
3. Use qGuiApp->devicePixelRatio() to get screen DPR instead of pixmap's potentially inaccurate devicePixelRatioF()

Log: Fix jagged edges in clipboard images at non-100% display scale ratios

fix(clipboard): 修复缩放比下剪贴板图片锯齿问题

1. 添加 QGuiApplication 头文件以使用 qGuiApp 全局指针
2. 将边框宽度从 4.0 调整为 3.0，改善视觉效果
3. 使用 qGuiApp->devicePixelRatio() 获取屏幕 DPR，替代 pixmap 自身可能不准确的 devicePixelRatioF()

Log: 修复非 100% 缩放比下剪贴板图片锯齿明显的问题
PMS: BUG-315075

Summary by Sourcery

Adjust clipboard image rendering to improve visual quality under fractional display scaling.

Bug Fixes:

• Correct device pixel ratio handling when generating rounded clipboard pixmaps to avoid jagged edges at non-100% scaling.

Enhancements:

• Tweak rounded pixmap border thickness for a cleaner clipboard image appearance.

[deepin-ci-robot]

Hi @MyLeeJiEun. Thanks for your PR. 😃

[deepin-ci-robot]

Hi @MyLeeJiEun. Thanks for your PR.

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR adjusts how rounded clipboard preview pixmaps are rendered under fractional display scaling, using the global QGuiApplication DPI instead of the pixmap’s own DPR and slightly reducing the border width for visual refinement.

Sequence diagram for clipboard pixmap rounding under fractional scaling

sequenceDiagram
    participant ClipboardPreview
    participant GetRoundPixmap
    participant qGuiApp
    participant Pixmap

    ClipboardPreview->>GetRoundPixmap: GetRoundPixmap(pix, borderColor)
    alt [qGuiApp is nonnull]
        GetRoundPixmap->>qGuiApp: devicePixelRatio()
        qGuiApp-->>GetRoundPixmap: dpr
    else [qGuiApp is null]
        GetRoundPixmap->>Pixmap: devicePixelRatioF()
        Pixmap-->>GetRoundPixmap: dpr
    end
    GetRoundPixmap-->>ClipboardPreview: roundedPixmap

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File-Level Changes

Change	Details	Files
Use screen-level device pixel ratio from QGuiApplication instead of the pixmap’s DPR when rendering rounded clipboard images to reduce jagged edges under fractional scaling.	Include QGuiApplication header to access the global application pointer for DPR queries. Compute the DPR using the global application pointer when available, falling back to the pixmap DPR if the application pointer is null. Use the computed DPR to size the target QImage used for rounded pixmap rendering.	dde-clipboard/constants.h
Tweak the visual styling of rounded clipboard pixmaps by narrowing the border width.	Reduce the border width constant from 4.0 to 3.0 in the rounded pixmap rendering helper function.	dde-clipboard/constants.h

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[sourcery-ai]

Hey - I've left some high level feedback:

• Consider avoiding a dependency on the global qGuiApp inside GetRoundPixmap by passing the device pixel ratio as a parameter instead, which will make the function easier to reuse and test independently of application state.
• Now that borderWidth and radius are magic numbers used for visual tuning, you might want to centralize them as named constants (e.g., constexpr) to make future adjustments and consistency across the codebase easier.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider avoiding a dependency on the global qGuiApp inside GetRoundPixmap by passing the device pixel ratio as a parameter instead, which will make the function easier to reuse and test independently of application state.
- Now that borderWidth and radius are magic numbers used for visual tuning, you might want to centralize them as named constants (e.g., constexpr) to make future adjustments and consistency across the codebase easier.

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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

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