Some further stuff.

Penumbra/Interop/Services/FontReloader.cs

@@ -0,0 +1,44 @@
+using FFXIVClientStructs.FFXIV.Client.System.Framework;
+using FFXIVClientStructs.FFXIV.Component.GUI;
+using Penumbra.GameData;
+
+namespace Penumbra.Interop.Services;
+
+/// <summary>
+/// Handle font reloading via game functions.
+/// May cause a interface flicker while reloading.
+/// </summary>
+public unsafe class FontReloader
+{
+    public bool Valid
+        => _reloadFontsFunc != null;
+
+    public void Reload()
+    {
+        if (Valid)
+            _reloadFontsFunc(_atkModule, false, true);
+        else
+            Penumbra.Log.Error("Could not reload fonts, function could not be found.");
+    }
+
+    private readonly AtkModule* _atkModule = null!;
+    private readonly delegate* unmanaged<AtkModule*, bool, bool, void> _reloadFontsFunc = null!;
+
+    public FontReloader()
+    {
+        var framework = Framework.Instance();
+        if (framework == null)
+            return;
+
+        var uiModule = framework->GetUiModule();
+        if (uiModule == null)
+            return;
+
+        var atkModule = uiModule->GetRaptureAtkModule();
+        if (atkModule == null)
+            return;
+
+        _atkModule = &atkModule->AtkModule;
+        _reloadFontsFunc = ((delegate* unmanaged<AtkModule*, bool, bool, void>*)_atkModule->vtbl)[Offsets.ReloadFontsVfunc];
+    }
+}