/// <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;
}
}
/// <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;
}
}
/// <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;
}
}
/// <summary>
/// Source: https://forum.pdfsharp.net/viewtopic.php?p=9039
/// </summary>
internal void CorrectOffsetForTTC()
{
_pos = 0;
string sTTCTag = this.ReadString(4);
if (sTTCTag != "ttcf")
{
_pos = 0; // Reset offset
return;
}
uint uiVersion = this.ReadULong();
uint uiFontCount = this.ReadULong();
bool bFoundFont = false;
for (uint uiFontIndex = 0; uiFontIndex < uiFontCount; ++uiFontIndex)
{
_pos = (int)(12 + (uiFontIndex * 4));
_pos = (int)this.ReadULong();
// Read offset table
uint nTempVersion = ReadULong();
uint nTempTableCount = ReadUShort();
uint nTempSearchRange = ReadUShort();
uint nTempEntrySelector = ReadUShort();
uint nTempRangeShift = ReadUShort();
TableDirectoryEntry nameTableEntry = null;
for (int idx = 0; idx < nTempTableCount; idx++)
{
TableDirectoryEntry entry = TableDirectoryEntry.ReadFrom(this);
if (entry.Tag == NameTable.Tag)
{
nameTableEntry = entry;
break;
}
}
if (nameTableEntry != null)
{
_pos = nameTableEntry.Offset;
TableDictionary.Add(nameTableEntry.Tag, nameTableEntry); // Add for create NameTable
NameTable nametbl = new NameTable(this);
TableDictionary.Remove(nameTableEntry.Tag); // clear after used
if (nametbl.Name == FontSource.FontName)
{
// Found font
_pos = (int)(12 + (uiFontIndex * 4));
_pos = (int)this.ReadULong();
bFoundFont = true;
break;
}
}
}
if (!bFoundFont)
{
_pos = 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;
}
}
