/**
* Parse a file and get a true type font.
*
* @param raf The TTF file.
* @return A TrueType font.
* @ If there is an error parsing the TrueType font.
*/
public TrueTypeFont Parse(TTFDataStream raf, string fontName = null)
{
if (string.Equals(raf.ReadString(4), TrueTypeCollection.TAG, StringComparison.Ordinal))
{
raf.Seek(raf.CurrentPosition - 4);
TrueTypeCollection fontCollection = new TrueTypeCollection(raf);
var nameFont = fontCollection.GetFontByName(fontName);
if (nameFont == null)
{
nameFont = fontCollection.GetFontAtIndex(0);
}
return(nameFont);
}
raf.Seek(raf.CurrentPosition - 4);
TrueTypeFont font = NewFont(raf);
font.Version = raf.Read32Fixed();
int numberOfTables = raf.ReadUnsignedShort();
int searchRange = raf.ReadUnsignedShort();
int entrySelector = raf.ReadUnsignedShort();
int rangeShift = raf.ReadUnsignedShort();
for (int i = 0; i < numberOfTables; i++)
{
TTFTable table = ReadTableDirectory(font, raf);
// skip tables with zero length
if (table != null)
{
font.AddTable(table);
}
}
// parse tables if wanted
if (!parseOnDemandOnly)
{
ParseTables(font);
}
return(font);
}
/**
* Write the subfont to the given output stream.
*
* @param os the stream used for writing. It will be closed by this method.
* @ if something went wrong.
* @throws IllegalStateException if the subset input empty.
*/
public void WriteToStream(Stream os)
{
if (glyphIds.Count == 0 && uniToGID.Count == 0)
{
Debug.WriteLine("info: font subset input empty");
}
AddCompoundReferences();
using (var output = new BinaryWriter(os, Charset.ASCII, true))
{
long[] newLoca = new long[glyphIds.Count + 1];
// generate tables in dependency order
byte[] head = buildHeadTable();
byte[] hhea = buildHheaTable();
byte[] maxp = BuildMaxpTable();
byte[] name = BuildNameTable();
byte[] os2 = BuildOS2Table();
byte[] glyf = BuildGlyfTable(newLoca);
byte[] loca = BuildLocaTable(newLoca);
byte[] cmap = BuildCmapTable();
byte[] hmtx = BuildHmtxTable();
byte[] post = BuildPostTable();
// save to TTF in optimized order
Dictionary <string, byte[]> tables = new Dictionary <string, byte[]>(StringComparer.Ordinal);
if (os2 != null)
{
tables["OS/2"] = os2;
}
if (cmap != null)
{
tables["cmap"] = cmap;
}
tables["glyf"] = glyf;
tables["head"] = head;
tables["hhea"] = hhea;
tables["hmtx"] = hmtx;
tables["loca"] = loca;
tables["maxp"] = maxp;
if (name != null)
{
tables["name"] = name;
}
if (post != null)
{
tables["post"] = post;
}
// copy all other tables
foreach (KeyValuePair <string, TTFTable> entry in ttf.TableMap)
{
string tag = entry.Key;
TTFTable table = entry.Value;
if (!tables.ContainsKey(tag) && (keepTables == null || keepTables.Contains(tag, StringComparer.Ordinal)))
{
tables[tag] = ttf.GetTableBytes(table);
}
}
// calculate checksum
long checksum = WriteFileHeader(output, tables.Count);
long offset = 12L + 16L * tables.Count;
foreach (var entry in tables)
{
checksum += WriteTableHeader(output, entry.Key, offset, entry.Value);
offset += (entry.Value.Length + 3) / 4 * 4;
}
checksum = 0xB1B0AFBAL - (checksum & 0xffffffffL);
// update checksumAdjustment in 'head' table
head[8] = (byte)(((uint)checksum) >> 24);
head[9] = (byte)(((uint)checksum) >> 16);
head[10] = (byte)(((uint)checksum) >> 8);
head[11] = (byte)checksum;
foreach (byte[] bytes in tables.Values)
{
WriteTableBody(output, bytes);
}
}
}