internal static NameTable GetNameTable(TrueTypeDataBytes data)
{
if (data == null)
{
throw new ArgumentNullException(nameof(data));
}
// Read these data points to move to the correct data location.
data.Read32Fixed();
int numberOfTables = data.ReadUnsignedShort();
data.ReadUnsignedShort();
data.ReadUnsignedShort();
data.ReadUnsignedShort();
TrueTypeHeaderTable?name = null;
for (var i = 0; i < numberOfTables; i++)
{
var tableHeader = ReadTable(data);
if (tableHeader.HasValue && tableHeader.Value.Tag == TrueTypeHeaderTable.Name)
{
name = tableHeader;
break;
}
}
if (!name.HasValue)
{
return(null);
}
return(TableParser.Parse <NameTable>(name.Value, data, new TableRegister.Builder()));
}
private static void OptionallyParseTables(IReadOnlyDictionary <string, TrueTypeHeaderTable> tables, TrueTypeDataBytes data, TableRegister.Builder tableRegister)
{
// cmap
if (tables.TryGetValue(TrueTypeHeaderTable.Cmap, out var cmap))
{
tableRegister.CMapTable = TableParser.Parse <CMapTable>(cmap, data, tableRegister);
}
// hmtx
if (tables.TryGetValue(TrueTypeHeaderTable.Hmtx, out var hmtxHeaderTable))
{
tableRegister.HorizontalMetricsTable = TableParser.Parse <HorizontalMetricsTable>(hmtxHeaderTable, data, tableRegister);
}
// kern
if (tables.TryGetValue(TrueTypeHeaderTable.Kern, out var kernHeaderTable))
{
tableRegister.KerningTable = KerningTable.Load(data, kernHeaderTable);
}
}
private static TrueTypeFont ParseTables(float version, IReadOnlyDictionary <string, TrueTypeHeaderTable> tables, TrueTypeDataBytes data)
{
var isPostScript = tables.ContainsKey(TrueTypeHeaderTable.Cff);
var builder = new TableRegister.Builder();
if (!tables.TryGetValue(TrueTypeHeaderTable.Head, out var table))
{
throw new InvalidFontFormatException($"The {TrueTypeHeaderTable.Head} table is required.");
}
// head
builder.HeaderTable = HeaderTable.Load(data, table);
if (!tables.TryGetValue(TrueTypeHeaderTable.Hhea, out var hHead))
{
throw new InvalidFontFormatException("The horizontal header table is required.");
}
// hhea
builder.HorizontalHeaderTable = TableParser.Parse <HorizontalHeaderTable>(hHead, data, builder);
if (!tables.TryGetValue(TrueTypeHeaderTable.Maxp, out var maxHeaderTable))
{
throw new InvalidFontFormatException("The maximum profile table is required.");
}
// maxp
builder.MaximumProfileTable = BasicMaximumProfileTable.Load(data, maxHeaderTable);
// post
if (tables.TryGetValue(TrueTypeHeaderTable.Post, out var postscriptHeaderTable))
{
builder.PostScriptTable = PostScriptTable.Load(data, postscriptHeaderTable, builder.MaximumProfileTable);
}
if (tables.TryGetValue(TrueTypeHeaderTable.Name, out var nameTable))
{
builder.NameTable = TableParser.Parse <NameTable>(nameTable, data, builder);
}
if (tables.TryGetValue(TrueTypeHeaderTable.Os2, out var os2Table))
{
builder.Os2Table = TableParser.Parse <Os2Table>(os2Table, data, builder);
}
if (!isPostScript)
{
if (!tables.TryGetValue(TrueTypeHeaderTable.Loca, out var indexToLocationHeaderTable))
{
throw new InvalidFontFormatException("The location to index table is required for non-PostScript fonts.");
}
// loca
builder.IndexToLocationTable =
IndexToLocationTable.Load(data, indexToLocationHeaderTable, builder);
if (!tables.TryGetValue(TrueTypeHeaderTable.Glyf, out var glyphHeaderTable))
{
throw new InvalidFontFormatException("The glyph table is required for non-PostScript fonts.");
}
// glyf
builder.GlyphDataTable = GlyphDataTable.Load(data, glyphHeaderTable, builder);
OptionallyParseTables(tables, data, builder);
}
return(new TrueTypeFont(version, tables, builder.Build()));
}
