private static string[] GetGlyphNamesByFormat(TrueTypeDataBytes data, BasicMaximumProfileTable maximumProfileTable,
float formatType)
{
string[] glyphNames;
if (Math.Abs(formatType - 1) < float.Epsilon)
{
glyphNames = new string[WindowsGlyphList4.NumberOfMacGlyphs];
Array.Copy(WindowsGlyphList4.MacGlyphNames, glyphNames, WindowsGlyphList4.NumberOfMacGlyphs);
}
else if (Math.Abs(formatType - 2) < float.Epsilon)
{
glyphNames = GetFormat2GlyphNames(data);
}
else if (Math.Abs(formatType - 2.5) < float.Epsilon)
{
var glyphNameIndex = new int[maximumProfileTable?.NumberOfGlyphs ?? 0];
for (var i = 0; i < glyphNameIndex.Length; i++)
{
var offset = data.ReadSignedByte();
glyphNameIndex[i] = i + 1 + offset;
}
glyphNames = new string[glyphNameIndex.Length];
for (var i = 0; i < glyphNames.Length; i++)
{
var name = WindowsGlyphList4.MacGlyphNames[glyphNameIndex[i]];
if (name != null)
{
glyphNames[i] = name;
}
}
}
else if (Math.Abs(formatType - 3) < float.Epsilon)
{
glyphNames = new string[0];
}
else
{
throw new InvalidOperationException($"Format type {formatType} is not supported for the PostScript table.");
}
return(glyphNames);
}
public static PostScriptTable Load(TrueTypeDataBytes data, TrueTypeHeaderTable table, BasicMaximumProfileTable maximumProfileTable)
{
data.Seek(table.Offset);
var formatType = data.Read32Fixed();
var italicAngle = data.Read32Fixed();
var underlinePosition = data.ReadSignedShort();
var underlineThickness = data.ReadSignedShort();
var isFixedPitch = data.ReadUnsignedInt();
var minMemType42 = data.ReadUnsignedInt();
var maxMemType42 = data.ReadUnsignedInt();
var mimMemType1 = data.ReadUnsignedInt();
var maxMemType1 = data.ReadUnsignedInt();
var glyphNames = GetGlyphNamesByFormat(data, maximumProfileTable, formatType);
return(new PostScriptTable(table, (decimal)formatType, (decimal)italicAngle,
underlinePosition, underlineThickness, isFixedPitch,
minMemType42, maxMemType42, mimMemType1,
maxMemType1, glyphNames));
}
public static IndexToLocationTable Load(TrueTypeDataBytes data, TrueTypeHeaderTable table, HeaderTable headerTable, BasicMaximumProfileTable maximumProfileTable)
{
const short shortFormat = 0;
const short longFormat = 1;
data.Seek(table.Offset);
var format = headerTable.IndexToLocFormat;
var glyphCount = maximumProfileTable.NumberOfGlyphs + 1;
var offsets = new long[glyphCount];
switch (format)
{
case shortFormat:
{ // The local offset divided by 2 is stored.
for (int i = 0; i < glyphCount; i++)
{
offsets[i] = data.ReadUnsignedShort() * 2;
}
break;
}
case longFormat:
{
// The actual offset is stored.
data.ReadUnsignedIntArray(offsets, glyphCount);
break;
}
default:
throw new InvalidOperationException($"The format {format} was invalid for the index to location (loca) table.");
}
return(new IndexToLocationTable(table, offsets));
}
