private void UpdateFontBitmap() {
_fontBitmapLoaded = false;
_fontBitmapImage = null;
_iconBitmapLoaded = false;
OnPropertyChanged(nameof(IconBitmap));
var baseFilename = Location.ApartFromLast(Extension, StringComparison.OrdinalIgnoreCase);
var bitmap = BitmapExtensions.Select(ext => baseFilename + ext).FirstOrDefault(File.Exists);
if (bitmap != FontBitmap) {
FontBitmap = bitmap;
} else {
OnImageChangedValue(FontBitmap);
}
ErrorIf(FontBitmap == null, AcErrorType.Font_BitmapIsMissing);
}