/// <summary> /// Reads all required table from the font prgram. /// </summary> internal void Read() { try { // Read offset table this.offsetTable.Version = ReadULong(); this.offsetTable.TableCount = ReadUShort(); this.offsetTable.SearchRange = ReadUShort(); this.offsetTable.EntrySelector = ReadUShort(); this.offsetTable.RangeShift = ReadUShort(); // Move to table dictionary at position 12 Debug.Assert(this.pos == 12); //this.tableDictionary = (this.offsetTable.TableCount); for (int idx = 0; idx < this.offsetTable.TableCount; idx++) { TableDirectoryEntry entry = TableDirectoryEntry.ReadFrom(this); this.tableDictionary.Add(entry.Tag, entry); #if VERBOSE Debug.WriteLine(String.Format("Font table: {0}", entry.Tag)); #endif } // PDFlib checks this, but it is not part of the OpenType spec anymore if (this.tableDictionary.ContainsKey("bhed")) throw new NotSupportedException("Bitmap fonts are not supported by PDFsharp."); // Read required tables if (Seek(CMapTable.Tag) != -1) this.cmap = new CMapTable(this); if (Seek(ControlValueTable.Tag) != -1) this.cvt = new ControlValueTable(this); if (Seek(FontProgram.Tag) != -1) this.fpgm = new FontProgram(this); if (Seek(MaximumProfileTable.Tag) != -1) this.maxp = new MaximumProfileTable(this); if (Seek(NameTable.Tag) != -1) this.name = new NameTable(this); if (Seek(FontHeaderTable.Tag) != -1) this.head = new FontHeaderTable(this); if (Seek(HorizontalHeaderTable.Tag) != -1) this.hhea = new HorizontalHeaderTable(this); if (Seek(HorizontalMetricsTable.Tag) != -1) this.hmtx = new HorizontalMetricsTable(this); if (Seek(OS2Table.Tag) != -1) this.os2 = new OS2Table(this); if (Seek(PostScriptTable.Tag) != -1) this.post = new PostScriptTable(this); if (Seek(GlyphDataTable.Tag) != -1) this.glyf = new GlyphDataTable(this); if (Seek(IndexToLocationTable.Tag) != -1) this.loca = new IndexToLocationTable(this); if (Seek(GlyphSubstitutionTable.Tag) != -1) this.gsub = new GlyphSubstitutionTable(this); if (Seek(ControlValueProgram.Tag) != -1) this.prep = new ControlValueProgram(this); } catch (Exception ex) { throw ex; } }
/// <summary> /// Creates a new font image that is a subset of this font image containing only the specified glyphs. /// </summary> public FontImage CreateFontSubSet(Dictionary<int, object> glyphs, bool cidFont) { // Create new font image FontImage fontImage = new FontImage(this); // Create new loca and glyf table IndexToLocationTable loca = new IndexToLocationTable(); loca.ShortIndex = this.loca.ShortIndex; GlyphDataTable glyf = new GlyphDataTable(); // Add all required tables //fontImage.AddTable(this.os2); if (!cidFont) fontImage.AddTable(this.cmap); if (this.cvt != null) fontImage.AddTable(this.cvt); if (this.fpgm != null) fontImage.AddTable(this.fpgm); fontImage.AddTable(glyf); fontImage.AddTable(this.head); fontImage.AddTable(this.hhea); fontImage.AddTable(this.hmtx); fontImage.AddTable(loca); if (this.maxp != null) fontImage.AddTable(this.maxp); //fontImage.AddTable(this.name); if (this.prep != null) fontImage.AddTable(this.prep); // Get closure of used glyphs this.glyf.CompleteGlyphClosure(glyphs); // Create a sorted array of all used glyphs int glyphCount = glyphs.Count; int[] glyphArray = new int[glyphCount]; glyphs.Keys.CopyTo(glyphArray, 0); Array.Sort<int>(glyphArray); // Calculate new size of glyph table. int size = 0; for (int idx = 0; idx < glyphCount; idx++) size += this.glyf.GetGlyphSize(glyphArray[idx]); glyf.DirectoryEntry.Length = size; // Create new loca table int numGlyphs = this.maxp.numGlyphs; loca.locaTable = new int[numGlyphs + 1]; // Create new glyf table glyf.glyphTable = new byte[glyf.DirectoryEntry.PaddedLength]; // Fill new glyf and loca table int glyphOffset = 0; int glyphIndex = 0; for (int idx = 0; idx < numGlyphs; idx++) { loca.locaTable[idx] = glyphOffset; if (glyphIndex < glyphCount && glyphArray[glyphIndex] == idx) { glyphIndex++; byte[] bytes = this.glyf.GetGlyphData(idx); int length = bytes.Length; if (length > 0) { Buffer.BlockCopy(bytes, 0, glyf.glyphTable, glyphOffset, length); glyphOffset += length; } } } loca.locaTable[numGlyphs] = glyphOffset; // Compile font tables into byte array fontImage.Compile(); return fontImage; }
/// <summary> /// Adds the specified table to this font image. /// </summary> public void AddTable(TrueTypeFontTable fontTable) { if (!CanWrite) throw new InvalidOperationException("Font image cannot be modified."); if (fontTable == null) throw new ArgumentNullException("fontTable"); if (fontTable.FontImage == null) { fontTable.fontImage = this; } else { Debug.Assert(fontTable.FontImage.CanRead); // Create a reference to this font table fontTable = new IRefFontTable(this, fontTable); } //Debug.Assert(fontTable.FontImage == null); //fontTable.fontImage = this; this.tableDictionary[fontTable.DirectoryEntry.Tag] = fontTable.DirectoryEntry; switch (fontTable.DirectoryEntry.Tag) { case TableTagNames.CMap: this.cmap = fontTable as CMapTable; break; case TableTagNames.Cvt: this.cvt = fontTable as ControlValueTable; break; case TableTagNames.Fpgm: this.fpgm = fontTable as FontProgram; break; case TableTagNames.MaxP: this.maxp = fontTable as MaximumProfileTable; break; case TableTagNames.Name: this.name = fontTable as NameTable; break; case TableTagNames.Head: this.head = fontTable as FontHeaderTable; break; case TableTagNames.HHea: this.hhea = fontTable as HorizontalHeaderTable; break; case TableTagNames.HMtx: this.hmtx = fontTable as HorizontalMetricsTable; break; case TableTagNames.OS2: this.os2 = fontTable as OS2Table; break; case TableTagNames.Post: this.post = fontTable as PostScriptTable; break; case TableTagNames.Glyf: this.glyf = fontTable as GlyphDataTable; break; case TableTagNames.Loca: this.loca = fontTable as IndexToLocationTable; break; case TableTagNames.GSUB: this.gsub = fontTable as GlyphSubstitutionTable; break; case TableTagNames.Prep: this.prep = fontTable as ControlValueProgram; break; } }