This table gives global information about the font. The bounding box values should be computed using only glyphs that have contours. Glyphs with no contours should be ignored for the purposes of these calculations.
Inheritance: PdfSharp.Fonts.OpenType.OpenTypeFontTable
Exemple #1
0
    /// <summary>
    /// Reads all required tables from the font data.
    /// </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);

        // ReSharper disable InconsistentNaming
        // Determine font technology
        const uint OTTO = 0x4f54544f;  // Adobe OpenType CFF data, tag: 'OTTO'
        const uint TTCF = 0x74746366;  // TrueType Collection tag: 'ttcf'  
        // ReSharper restore InconsistentNaming
        if (this.offsetTable.Version == TTCF)
        {
          this.fontTechnology = FontTechnology.TrueTypeCollection;
          throw new InvalidOperationException("TrueType collection fonts are not supported by PDFsharp.");
        }
        else if (this.offsetTable.Version == OTTO)
          this.fontTechnology = FontTechnology.PostscriptOutlines;
        else
          this.fontTechnology = FontTechnology.TrueTypeOutlines;

        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)
      {
        GetType();
        throw;
      }
    }
Exemple #2
0
    /// <summary>
    /// Adds the specified table to this font image.
    /// </summary>
    public void AddTable(OpenTypeFontTable fontTable)
    {
      if (!CanWrite)
        throw new InvalidOperationException("Font image cannot be modified.");

      if (fontTable == null)
        throw new ArgumentNullException("fontTable");

      if (fontTable.fontData == null)
      {
        fontTable.fontData = this;
      }
      else
      {
        Debug.Assert(fontTable.fontData.CanRead);
        // Create a reference to this font table
        fontTable = new IRefFontTable(this, fontTable);
      }

      //Debug.Assert(fontTable.FontData == null);
      //fontTable.fontData = 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;
      }
    }