private byte[] BuildOS2Table()
{
OS2WindowsMetricsTable os2 = ttf.OS2Windows;
if (os2 == null || uniToGID.Count == 0 || keepTables != null && !keepTables.Contains("OS/2", StringComparer.Ordinal))
{
return(null);
}
using (var bos = new MemoryStream())
using (var output = new BinaryWriter(bos))
{
WriteUint16(output, os2.Version);
WriteSInt16(output, os2.AverageCharWidth);
WriteUint16(output, os2.WeightClass);
WriteUint16(output, os2.WidthClass);
WriteSInt16(output, os2.FsType);
WriteSInt16(output, os2.SubscriptXSize);
WriteSInt16(output, os2.SubscriptYSize);
WriteSInt16(output, os2.SubscriptXOffset);
WriteSInt16(output, os2.SubscriptYOffset);
WriteSInt16(output, os2.SuperscriptXSize);
WriteSInt16(output, os2.SuperscriptYSize);
WriteSInt16(output, os2.SuperscriptXOffset);
WriteSInt16(output, os2.SuperscriptYOffset);
WriteSInt16(output, os2.StrikeoutSize);
WriteSInt16(output, os2.StrikeoutPosition);
WriteSInt16(output, (short)os2.FamilyClass);
output.Write(os2.Panose);
WriteUint32(output, 0);
WriteUint32(output, 0);
WriteUint32(output, 0);
WriteUint32(output, 0);
output.Write(Charset.ASCII.GetBytes(os2.AchVendId));
WriteUint16(output, os2.FsSelection);
WriteUint16(output, uniToGID.Keys.First());
WriteUint16(output, uniToGID.Keys.Last());
WriteUint16(output, os2.TypoAscender);
WriteUint16(output, os2.TypoDescender);
WriteUint16(output, os2.TypoLineGap);
WriteUint16(output, os2.WinAscent);
WriteUint16(output, os2.WinDescent);
output.Flush();
return(bos.ToArray());
}
}
private TTFTable ReadTableDirectory(TrueTypeFont font, TTFDataStream raf)
{
TTFTable table;
string tag = raf.ReadString(4);
switch (tag)
{
case CmapTable.TAG:
table = new CmapTable(font);
break;
case GlyphTable.TAG:
table = new GlyphTable(font);
break;
case HeaderTable.TAG:
table = new HeaderTable(font);
break;
case HorizontalHeaderTable.TAG:
table = new HorizontalHeaderTable(font);
break;
case HorizontalMetricsTable.TAG:
table = new HorizontalMetricsTable(font);
break;
case IndexToLocationTable.TAG:
table = new IndexToLocationTable(font);
break;
case MaximumProfileTable.TAG:
table = new MaximumProfileTable(font);
break;
case NamingTable.TAG:
table = new NamingTable(font);
break;
case OS2WindowsMetricsTable.TAG:
table = new OS2WindowsMetricsTable(font);
break;
case PostScriptTable.TAG:
table = new PostScriptTable(font);
break;
case DigitalSignatureTable.TAG:
table = new DigitalSignatureTable(font);
break;
case KerningTable.TAG:
table = new KerningTable(font);
break;
case VerticalHeaderTable.TAG:
table = new VerticalHeaderTable(font);
break;
case VerticalMetricsTable.TAG:
table = new VerticalMetricsTable(font);
break;
case VerticalOriginTable.TAG:
table = new VerticalOriginTable(font);
break;
case GlyphSubstitutionTable.TAG:
table = new GlyphSubstitutionTable(font);
break;
default:
table = ReadTable(font, tag);
break;
}
table.Tag = tag;
table.CheckSum = raf.ReadUnsignedInt();
table.Offset = raf.ReadUnsignedInt();
table.Length = raf.ReadUnsignedInt();
// skip tables with zero length (except glyf)
if (table.Length == 0 && !tag.Equals(GlyphTable.TAG, StringComparison.Ordinal))
{
return(null);
}
return(table);
}
