dotnet/wpf
TextFormatter.FormatLine has O(n^2) performance when called multiple times
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#6,304 创建于 2022年3月23日
Performancehelp wanted
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描述
- .NET Core Version: .net 6
- Windows version: 11
- Does the bug reproduce also in WPF for .NET Framework 4.8?: Yes
- Is this bug related specifically to tooling in Visual Studio (e.g. XAML Designer, Code editing, etc...)? no
Actual behavior:
TextFormatter.FormatLine has O(n^2) performance
Expected behavior:
TextFormatter.FormatLine exhibits linear performance
Minimal repro: WpfFontRepro.zip
Remarks
Disposing the formatted lines or creating new TextFormatter instances prevents the O(n^2) behavior.