Fix invisible subtitles on real displays (QVideoWidget native layer)#26
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… real displays: QVideoWidget is a native window on macOS and swallows any widget overlay.
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背景
#25 的字幕在离屏测试全部正常,但实机播放看不到。根因:Qt 6 的 QVideoWidget 在 macOS 上是原生窗口层(Metal),普通 widget 永远叠不到它上面——离屏平台纯软件合成所以测试看得到,真机上字幕被视频层无声吞掉。
改动与实现
验证
uv run pytest -q:163 passed / 5 skipped(纯函数测试不受渲染层影响)