fix(stream): use measured viewport for pip sizing

[qiin2333]

改了啥呀

• 在串流视频根容器上记录 ArkUI 实际布局尺寸，画中画/浮窗场景优先用这个尺寸重新计算 XComponent。
• 保留原来的全屏和窗口尺寸兜底逻辑，没有把 ArkUI layout 状态塞进 service，职责更清爽一点。
• 画面尺寸变化后同步更新 displayInfo 和 PanZoom 父容器尺寸，避免缩放触控坐标继续被旧尺寸带偏。裁切小问题，别再装大尾巴狼了。

为啥要改

用户反馈画中画里“画面居中了但是裁切，没有缩放”。之前修复主要依赖 window/drawableRect，在 PiP 这种系统容器里可能仍然拿到偏大的窗口尺寸。ArkUI 的 onAreaChange 才是当前页面真实可绘制区域，用它做 XComponent 等比适配更贴近实际布局。

验证

• git diff --check -- entry/src/main/ets/pages/StreamPage.ets
• 尝试运行：NODE_PATH=/Users/mac/Program/moonlight-harmony/node_modules DEVECO_SDK_HOME=/Users/mac/ohos-sdk-cache/6.1-Release-mac/sdk-ci-shape node /Applications/DevEco-Studio.app/Contents/tools/hvigor/hvigor/bin/hvigor.js --no-daemon --mode module -p module=entry assembleHap
  • 当前本机阻塞在 :nativelib:default@BuildNativeWithCmake，缓存 SDK 的 clang++ 链接阶段走到 macOS ld64.lld，不识别 OHOS linker 参数（如 --build-id=sha1、--no-undefined、-z）。

需要测试和回归

• 画中画/PiP：横屏串流进入画中画后，画面应完整等比缩小，不再居中裁切。
• 普通浮窗：拖拽/调整窗口大小后，XComponent 应继续按窗口内容区等比适配。
• 全屏串流：首次进入、横竖屏切换、服务端分辨率变化后不应出现额外黑边或拉伸。
• 缩放模式：双指缩放开启后，触控坐标不应相对画面偏移。
• stretchVideo 开启时：仍应按设置填满容器，不被本次 measured viewport 逻辑破坏。

Summary by CodeRabbit

优化与修复

• Bug Fixes

  • 改进视频视口尺寸测量与缓存机制，减少抖动与重复计算
  • 在全屏及窗口模式下优先使用已测量的视口尺寸，缺失时自动回退
  • 容器/视口区域变化时，能更准确同步调整视频显示与映射

• Performance

  • 对视口变化更新进行阈值去抖，降低频繁重算带来的卡顿

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• entry/src/main/ets/pages/StreamPage.ets

🚧 Files skipped from review as they are similar to previous changes (1)

• entry/src/main/ets/pages/StreamPage.ets

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📝 Walkthrough

Walkthrough

StreamPage 新增 videoViewportWidthVp/HeightVp 状态字段及对应的 getMeasuredVideoViewportSize() 与 handleVideoViewportAreaChange() 方法，后者带阈值去抖。recalculateXComponentSize() 与 configureStreamWindow() 均改为优先使用测量视口尺寸计算 XComponent 大小，同时引入 DisplaySize 类型。

Changes

视频视口尺寸缓存与 XComponent 计算优先策略

Layer / File(s)	Summary
视口状态字段、缓存方法与去抖处理 entry/src/main/ets/pages/StreamPage.ets	引入 DisplaySize 类型；新增 videoViewportWidthVp/HeightVp 状态字段；新增 handleVideoViewportAreaChange（阈值去抖 + 缓存更新 + 触发重算）与 getMeasuredVideoViewportSize（返回 DisplaySize | null）；onAreaChange 改为调用 handleVideoViewportAreaChange。
recalculateXComponentSize 中的测量视口优先逻辑 entry/src/main/ets/pages/StreamPage.ets	全屏分支：measuredViewport 存在时跳过 updateScreenSize()；非全屏分支：优先使用 measuredViewport，无测量值时才异步获取当前窗口视口尺寸。
configureStreamWindow 中的测量视口优先策略 entry/src/main/ets/pages/StreamPage.ets	用 getMeasuredVideoViewportSize() 更新 displayInfo.screenWidth/Height，并根据测量视口是否存在在 calculateXComponentSizeForViewport 与 calculateXComponentSize 之间切换。

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• AlkaidLab/moonlight-harmony#47：同样修改 StreamPage.ets 中 XComponent 尺寸计算逻辑，引入 StreamWindowManager.getCurrentWindowViewportSize() 与 calculateXComponentSizeForViewport()，是本次测量视口优先策略的直接前置变更。

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	PR 标题准确概括了主要改动：在 PiP 尺寸计算中使用测量的视口尺寸，清晰指出了问题域（stream）和解决方案（measured viewport）。
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/fix-pip-viewport-sizing

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@entry/src/main/ets/pages/StreamPage.ets`:
- Around line 1253-1256: The code updates displayInfo.screenWidth and
screenHeight when viewportSize is available, but fails to synchronize the
panZoomHandler parent container size, which causes touch coordinate offset
issues during scaling interactions. After updating the displayInfo dimensions in
the if block (where viewportSize is checked), also call
panZoomHandler.setParentSize() with the same width and height values. Apply this
same synchronization fix to all locations where displayInfo screen dimensions
are updated, including the section referenced at lines 1259-1265.

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Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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• entry/src/main/ets/pages/StreamPage.ets