https://learn.microsoft.com/en-us/dotnet/api/system.windows.media.formattedtext?view=netframework-4.8.1&viewFallbackFrom=net-5.0
FormattedText Class (System.Windows.Media) | Microsoft Learn
Provides low-level control for drawing text in Windows Presentation Foundation (WPF) applications.
class systemwindows mediamicrosoftlearn