static Glyph[] ImportFont(SpriteFontAsset options, out float lineSpacing, out float baseLine)
{
// Which importer knows how to read this source font?
IFontImporter importer;
var sourceExtension = (Path.GetExtension(options.FontSource.GetFontPath()) ?? "").ToLowerInvariant();
var bitmapFileExtensions = new List <string> {
".bmp", ".png", ".gif"
};
var importFromBitmap = bitmapFileExtensions.Contains(sourceExtension);
importer = importFromBitmap ? (IFontImporter) new BitmapImporter() : new TrueTypeImporter();
// create the list of character to import
var characters = GetCharactersToImport(options);
// Import the source font data.
importer.Import(options, characters);
lineSpacing = importer.LineSpacing;
baseLine = importer.BaseLine;
// Get all glyphs
var glyphs = new List <Glyph>(importer.Glyphs);
// Validate.
if (glyphs.Count == 0)
{
throw new Exception("Font does not contain any glyphs.");
}
if (!importFromBitmap && options.FontType.AntiAlias != FontAntiAliasMode.ClearType)
{
foreach (var glyph in importer.Glyphs)
{
BitmapUtils.ConvertGreyToAlpha(glyph.Bitmap, glyph.Subrect);
}
}
// Sort the glyphs
glyphs.Sort((left, right) => left.Character.CompareTo(right.Character));
// Check that the default character is part of the glyphs
if (options.DefaultCharacter != 0)
{
bool defaultCharacterFound = false;
foreach (var glyph in glyphs)
{
if (glyph.Character == options.DefaultCharacter)
{
defaultCharacterFound = true;
break;
}
}
if (!defaultCharacterFound)
{
throw new InvalidOperationException("The specified DefaultCharacter is not part of this font.");
}
}
return(glyphs.ToArray());
}
