internal bool Read(Typeface typeface, BinaryReader reader, RestoreTicket ticket)
{
//WOFF File
//WOFFHeader File header with basic font type and version, along with offsets to metadata and private data blocks.
//TableDirectory Directory of font tables, indicating the original size, compressed size and location of each table within the WOFF file.
//FontTables The font data tables from the input sfnt font, compressed to reduce bandwidth requirements.
//ExtendedMetadata An optional block of extended metadata, represented in XML format and compressed for storage in the WOFF file.
//PrivateData An optional block of private data for the font designer, foundry, or vendor to use.
_header = ReadWOFFHeader(reader);
if (_header == null)
{
#if DEBUG
System.Diagnostics.Debug.WriteLine("can't read ");
#endif
return(false);
}
//
WoffTableDirectory[] woffTableDirs = ReadTableDirectories(reader);
if (woffTableDirs == null)
{
return(false);
}
//
//try read each compressed table
if (DecompressHandler == null)
{
if (WoffDefaultZlibDecompressFunc.DecompressHandler != null)
{
DecompressHandler = WoffDefaultZlibDecompressFunc.DecompressHandler;
}
else
{
#if DEBUG
System.Diagnostics.Debug.WriteLine("no Zlib DecompressHandler ");
#endif
return(false);
}
}
TableEntryCollection tableEntryCollection = CreateTableEntryCollection(woffTableDirs);
using (MemoryStream decompressStream = new MemoryStream())
{
if (Extract(reader, woffTableDirs, decompressStream))
{
using (ByteOrderSwappingBinaryReader reader2 = new ByteOrderSwappingBinaryReader(decompressStream))
{
decompressStream.Position = 0;
OpenFontReader openFontReader = new OpenFontReader();
return(openFontReader.ReadTableEntryCollection(typeface, ticket, tableEntryCollection, reader2));
}
}
}
return(false);
}
static void TestLoadAndReload(string filename)
{
//Trimmable feature tests:
//[A] read the font file as usual => get full information about the font
Typeface typeface = null;
using (FileStream fs = new FileStream(filename, FileMode.Open))
{
//read in full mode
OpenFontReader openFontReader = new OpenFontReader();
typeface = openFontReader.Read(fs);
}
//before
bool hasColor1 = typeface.HasColorTable();
bool hasSvg1 = typeface.HasSvgTable();
bool hasCff1 = typeface.IsCffFont;
TrimMode glyphMode1 = typeface.GetTrimMode();
Glyph g1_1 = typeface.GetGlyph(1);
//---------------------------------------------------------
//[B] if you create paths from glyphs, or atlas from glyph
// and you don't want any glyph-building-detail (eg. to reduce memory usuage)
// but you still want to use the typeface for text-layout
// you can trim it down
RestoreTicket ticket = typeface.TrimDown();//***
//[C] you can GetGlyph() but this is ANOTHER NEW GLYPH
//without building instruction( eg. no cff,ttf,svg data,bitmap)
Glyph g1_2 = typeface.GetGlyph(1);
//** if you cache the the old version of 'full-info' glyph**
// the info is still cache on the old glyph and it can be used as 'full-info' glyph
// TrimDown() DOES NOT go to delete that glyph.
bool hasColor2 = typeface.HasColorTable();
bool hasSvg2 = typeface.HasSvgTable();
bool hasCff2 = typeface.IsCffFont;
TrimMode glyphMode2 = typeface.GetTrimMode();
//---------------------------------------------------------
//[D] can we load glyph detail again?
//yes=> this need 'ticket' from latest TrimDown()
//if you don't have it, you can't restore it.
using (FileStream fs = new FileStream(filename, FileMode.Open))
{
typeface.RestoreUp(ticket, fs);
}
}
internal bool Read(Typeface typeface, RestoreTicket ticket, Stream stream, int streamStartOffset = 0, ReadFlags readFlags = ReadFlags.Full)
{
//bool little = BitConverter.IsLittleEndian;
if (streamStartOffset > 0)
{
//eg. for ttc
stream.Seek(streamStartOffset, SeekOrigin.Begin);
}
using (var input = new ByteOrderSwappingBinaryReader(stream))
{
ushort majorVersion = input.ReadUInt16();
ushort minorVersion = input.ReadUInt16();
if (KnownFontFiles.IsTtcf(majorVersion, minorVersion))
{
//this font stream is 'The Font Collection'
//To read content of ttc=> one must specific the offset
//so use read preview first=> you will know that what are inside the ttc.
return(false);
}
else if (KnownFontFiles.IsWoff(majorVersion, minorVersion))
{
//check if we enable woff or not
WebFont.WoffReader woffReader = new WebFont.WoffReader();
input.BaseStream.Position = 0;
return(woffReader.Read(typeface, input, ticket));
}
else if (KnownFontFiles.IsWoff2(majorVersion, minorVersion))
{
//check if we enable woff2 or not
WebFont.Woff2Reader woffReader = new WebFont.Woff2Reader();
input.BaseStream.Position = 0;
return(woffReader.Read(typeface, input, ticket));
}
//-----------------------------------------------------------------
ushort tableCount = input.ReadUInt16();
ushort searchRange = input.ReadUInt16();
ushort entrySelector = input.ReadUInt16();
ushort rangeShift = input.ReadUInt16();
//------------------------------------------------------------------
var tables = new TableEntryCollection();
for (int i = 0; i < tableCount; i++)
{
tables.AddEntry(new UnreadTableEntry(ReadTableHeader(input)));
}
//------------------------------------------------------------------
return(ReadTableEntryCollection(typeface, ticket, tables, input));
}
}
//-------
//test incorrect restore
void TestIncorrectRestore(string file1, string file2)
{
Typeface typeface = null;
using (FileStream fs = new FileStream(file1, FileMode.Open))
{
//read in full mode
OpenFontReader openFontReader = new OpenFontReader();
typeface = openFontReader.Read(fs);
}
RestoreTicket ticket = typeface.TrimDown();
//test restore with incorrect file
using (FileStream fs = new FileStream(file2, FileMode.Open))
{
typeface.RestoreUp(ticket, fs);
}
}
internal RestoreTicket TrimDownAndRemoveGlyphBuildingDetail()
{
switch (_typefaceTrimMode)
{
default: throw new NotSupportedException();
case TrimMode.EssentailLayoutInfo: return(null); //same mode
case TrimMode.Restored:
case TrimMode.No:
{
RestoreTicket ticket = new RestoreTicket();
ticket.TypefaceName = Name;
ticket.Headers = _tblHeaders; //a copy
//FROM:GlyphLoadingMode.Full => TO: GlyphLoadingMode.EssentailLayoutInfo
ticket.HasTtf = _hasTtfOutline;
//cache glyph name before unload
if (_cff1FontSet != null)
{
ticket.HasCff = true;
UpdateCff1FontSetNamesCache(); //***
_cff1FontSet = null;
}
//1.Ttf and Otf => clone each glyphs in NO building
Glyph[] newClones = new Glyph[_glyphs.Length];
for (int i = 0; i < newClones.Length; ++i)
{
newClones[i] = Glyph.Clone_NO_BuildingInstructions(_glyphs[i]);
}
_glyphs = newClones;
//and since glyph has no building instructions in this mode
//so ...
ticket.ControlValues = ControlValues != null;
ControlValues = null;
ticket.PrepProgramBuffer = PrepProgramBuffer != null;
PrepProgramBuffer = null;
ticket.FpgmProgramBuffer = FpgmProgramBuffer != null;
FpgmProgramBuffer = null;
ticket.CPALTable = CPALTable != null;
CPALTable = null;
ticket.COLRTable = COLRTable != null;
COLRTable = null;
ticket.GaspTable = GaspTable != null;
GaspTable = null;
//
//3. Svg=> remove SvgTable
if (_svgTable != null)
{
ticket.HasSvg = true;
_svgTable.UnloadSvgData();
_svgTable = null;
}
//4. Bitmap Font => remove embeded bitmap data
if (_bitmapFontGlyphSource != null)
{
ticket.HasBitmapSource = true;
_bitmapFontGlyphSource.UnloadCBDT();
}
_typefaceTrimMode = TrimMode.EssentailLayoutInfo;
return(ticket);
}
}
}
internal bool ReadTableEntryCollection(Typeface typeface, RestoreTicket ticket, TableEntryCollection tables, BinaryReader input)
{
if (ticket != null)
{
return(ReadTableEntryCollectionOnRestoreMode(typeface, ticket, tables, input));
}
typeface.SetTableEntryCollection(tables.CloneTableHeaders());
var rd = new EntriesReaderHelper(tables, input);
//PART 1: basic information
OS2Table os2Table = rd.Read(new OS2Table());
Meta meta = rd.Read(new Meta());
NameEntry nameEntry = rd.Read(new NameEntry());
Head head = rd.Read(new Head());
MaxProfile maxProfile = rd.Read(new MaxProfile());
HorizontalHeader horizontalHeader = rd.Read(new HorizontalHeader());
HorizontalMetrics horizontalMetrics = rd.Read(new HorizontalMetrics(horizontalHeader.NumberOfHMetrics, maxProfile.GlyphCount));
VerticalHeader vhea = rd.Read(new VerticalHeader());
if (vhea != null)
{
VerticalMetrics vmtx = rd.Read(new VerticalMetrics(vhea.NumOfLongVerMetrics));
}
Cmap cmaps = rd.Read(new Cmap());
VerticalDeviceMetrics vdmx = rd.Read(new VerticalDeviceMetrics());
Kern kern = rd.Read(new Kern());
//------------------------------------
//PART 2: glyphs detail
//2.1 True type font
GlyphLocations glyphLocations = rd.Read(new GlyphLocations(maxProfile.GlyphCount, head.WideGlyphLocations));
Glyf glyf = rd.Read(new Glyf(glyphLocations));
Gasp gaspTable = rd.Read(new Gasp());
COLR colr = rd.Read(new COLR());
CPAL cpal = rd.Read(new CPAL());
//2.2 Cff font
PostTable postTable = rd.Read(new PostTable());
CFFTable cff = rd.Read(new CFFTable());
//additional math table (if available)
MathTable mathtable = rd.Read(new MathTable());
//------------------------------------
//PART 3: advanced typography
GDEF gdef = rd.Read(new GDEF());
GSUB gsub = rd.Read(new GSUB());
GPOS gpos = rd.Read(new GPOS());
BASE baseTable = rd.Read(new BASE());
JSTF jstf = rd.Read(new JSTF());
STAT stat = rd.Read(new STAT());
if (stat != null)
{
//variable font
FVar fvar = rd.Read(new FVar());
if (fvar != null)
{
GVar gvar = rd.Read(new GVar());
CVar cvar = rd.Read(new CVar());
HVar hvar = rd.Read(new HVar());
MVar mvar = rd.Read(new MVar());
AVar avar = rd.Read(new AVar());
}
}
bool isPostScriptOutline = false;
bool isBitmapFont = false;
typeface.SetBasicTypefaceTables(os2Table, nameEntry, head, horizontalMetrics);
if (glyf == null)
{
//check if this is cff table ?
if (cff == null)
{
//check cbdt/cblc ?
CBLC cblcTable = rd.Read(new CBLC());
if (cblcTable != null)
{
CBDT cbdtTable = rd.Read(new CBDT());
//read cbdt
//bitmap font
BitmapFontGlyphSource bmpFontGlyphSrc = new BitmapFontGlyphSource(cblcTable);
bmpFontGlyphSrc.LoadCBDT(cbdtTable);
Glyph[] glyphs = bmpFontGlyphSrc.BuildGlyphList();
typeface.SetBitmapGlyphs(glyphs, bmpFontGlyphSrc);
isBitmapFont = true;
}
else
{
//TODO:
EBLC fontBmpTable = rd.Read(new EBLC());
throw new NotSupportedException();
}
}
else
{
isPostScriptOutline = true;
typeface.SetCffFontSet(cff.Cff1FontSet);
}
}
else
{
typeface.SetTtfGlyphs(glyf.Glyphs);
}
//----------------------------
typeface.CmapTable = cmaps;
typeface.KernTable = kern;
typeface.MaxProfile = maxProfile;
typeface.HheaTable = horizontalHeader;
//----------------------------
typeface.GaspTable = gaspTable;
if (!isPostScriptOutline && !isBitmapFont)
{
//for true-type font outline
FpgmTable fpgmTable = rd.Read(new FpgmTable());
//control values table
CvtTable cvtTable = rd.Read(new CvtTable());
PrepTable propProgramTable = rd.Read(new PrepTable());
typeface.ControlValues = cvtTable?._controlValues;
typeface.FpgmProgramBuffer = fpgmTable?._programBuffer;
typeface.PrepProgramBuffer = propProgramTable?._programBuffer;
}
//-------------------------
typeface.LoadOpenFontLayoutInfo(
gdef,
gsub,
gpos,
baseTable,
colr,
cpal);
//------------
typeface.SetSvgTable(rd.Read(new SvgTable()));
typeface.PostTable = postTable;
if (mathtable != null)
{
MathGlyphLoader.LoadMathGlyph(typeface, mathtable);
}
#if DEBUG
//test
//int found = typeface.GetGlyphIndexByName("Uacute");
if (typeface.IsCffFont)
{
//optional
typeface.UpdateAllCffGlyphBounds();
}
#endif
typeface.UpdateLangs(meta);
typeface.UpdateFrequentlyUsedValues();
return(true);
}
bool ReadTableEntryCollectionOnRestoreMode(Typeface typeface, RestoreTicket ticket, TableEntryCollection tables, BinaryReader input)
{
//RESTORE MODE
//check header matches
if (!typeface.IsTrimmed() ||
!typeface.CompareOriginalHeadersWithNewlyLoadOne(tables.CloneTableHeaders()))
{
return(false);
}
var rd = new EntriesReaderHelper(tables, input);
//PART 1: basic information
//..
//------------------------------------
//PART 2: glyphs detail
//2.1 True type font
GlyphLocations glyphLocations = ticket.HasTtf ? rd.Read(new GlyphLocations(typeface.MaxProfile.GlyphCount, typeface.Head.WideGlyphLocations)) : null;
Glyf glyf = ticket.HasTtf ? rd.Read(new Glyf(glyphLocations)) : null;
typeface.GaspTable = ticket.GaspTable ? rd.Read(new Gasp()) : null;
typeface.SetColorAndPalTable(
ticket.COLRTable ? rd.Read(new COLR()) : null,
ticket.CPALTable ? rd.Read(new CPAL()) : null);
//2.2 Cff font
CFFTable cff = ticket.HasCff ? rd.Read(new CFFTable()) : null;
bool isPostScriptOutline = false;
bool isBitmapFont = false;
if (glyf == null)
{
//check if this is cff table ?
if (cff == null)
{
//check cbdt/cblc ?
if (ticket.HasBitmapSource)
{
//reload only CBDT (embeded bitmap)
CBDT cbdt = rd.Read(new CBDT());
typeface._bitmapFontGlyphSource.LoadCBDT(cbdt);
//just clone existing glyph
isBitmapFont = true;
}
else
{
//?
throw new NotSupportedException();
}
}
else
{
isPostScriptOutline = true;
typeface.SetCffFontSet(cff.Cff1FontSet);
}
}
else
{
typeface.SetTtfGlyphs(glyf.Glyphs);
}
if (!isPostScriptOutline && !isBitmapFont)
{
//for true-type font outline
FpgmTable fpgmTable = rd.Read(new FpgmTable());
//control values table
CvtTable cvtTable = rd.Read(new CvtTable());
PrepTable propProgramTable = rd.Read(new PrepTable());
typeface.ControlValues = cvtTable?._controlValues;
typeface.FpgmProgramBuffer = fpgmTable?._programBuffer;
typeface.PrepProgramBuffer = propProgramTable?._programBuffer;
}
if (ticket.HasSvg)
{
typeface.SetSvgTable(rd.Read(new SvgTable()));
}
#if DEBUG
//test
//int found = typeface.GetGlyphIndexByName("Uacute");
if (typeface.IsCffFont)
{
//optional???
typeface.UpdateAllCffGlyphBounds();
}
#endif
typeface._typefaceTrimMode = TrimMode.Restored;
return(true);
}
