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); }