public int UnregisterFontFileLoader([NativeTypeName("IDWriteFontFileLoader *")] IDWriteFontFileLoader *fontFileLoader)
 {
     return(((delegate * unmanaged <IDWriteFactory1 *, IDWriteFontFileLoader *, int>)(lpVtbl[14]))((IDWriteFactory1 *)Unsafe.AsPointer(ref this), fontFileLoader));
 }
 public int CreateCustomFontFileReference([NativeTypeName("const void *")] void *fontFileReferenceKey, [NativeTypeName("UINT32")] uint fontFileReferenceKeySize, [NativeTypeName("IDWriteFontFileLoader *")] IDWriteFontFileLoader *fontFileLoader, [NativeTypeName("IDWriteFontFile **")] IDWriteFontFile **fontFile)
 {
     return(((delegate * unmanaged <IDWriteFactory1 *, void *, uint, IDWriteFontFileLoader *, IDWriteFontFile **, int>)(lpVtbl[8]))((IDWriteFactory1 *)Unsafe.AsPointer(ref this), fontFileReferenceKey, fontFileReferenceKeySize, fontFileLoader, fontFile));
 }
 public int RegisterFontFileLoader(IDWriteFontFileLoader *fontFileLoader)
 {
     return(((delegate * unmanaged <IDWriteFactory5 *, IDWriteFontFileLoader *, int>)(lpVtbl[13]))((IDWriteFactory5 *)Unsafe.AsPointer(ref this), fontFileLoader));
 }