private static TrueTypeFontProgram ParseTables(decimal 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 = HorizontalHeaderTable.Load(data, hHead);
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 TrueTypeFontProgram(version, tables, builder.Build()));
}
