|
public static ReadFrom ( |
||
| fontData | ||
| Результат | ||
/// <summary>
/// Reads all required tables from the font data.
/// </summary>
internal void Read()
{
// Determine font technology
// ReSharper disable InconsistentNaming
const uint OTTO = 0x4f54544f; // Adobe OpenType CFF data, tag: 'OTTO'
const uint TTCF = 0x74746366; // TrueType Collection tag: 'ttcf'
// ReSharper restore InconsistentNaming
try
{
#if DEBUG_
if (Name == "Cambria")
{
Debug - Break.Break();
}
#endif
// Check if data is a TrueType collection font.
uint startTag = ReadULong();
if (startTag == TTCF)
{
_fontTechnology = FontTechnology.TrueTypeCollection;
throw new InvalidOperationException("TrueType collection fonts are not yet supported by PDFsharp.");
}
// Read offset table
_offsetTable.Version = startTag;
_offsetTable.TableCount = ReadUShort();
_offsetTable.SearchRange = ReadUShort();
_offsetTable.EntrySelector = ReadUShort();
_offsetTable.RangeShift = ReadUShort();
// Move to table dictionary at position 12
Debug.Assert(_pos == 12);
//tableDictionary = (offsetTable.TableCount);
if (_offsetTable.Version == OTTO)
{
_fontTechnology = FontTechnology.PostscriptOutlines;
}
else
{
_fontTechnology = FontTechnology.TrueTypeOutlines;
}
for (int idx = 0; idx < _offsetTable.TableCount; idx++)
{
TableDirectoryEntry entry = TableDirectoryEntry.ReadFrom(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 (TableDictionary.ContainsKey("bhed"))
{
throw new NotSupportedException("Bitmap fonts are not supported by PDFsharp.");
}
// Read required tables
if (Seek(CMapTable.Tag) != -1)
{
cmap = new CMapTable(this);
}
if (Seek(ControlValueTable.Tag) != -1)
{
cvt = new ControlValueTable(this);
}
if (Seek(FontProgram.Tag) != -1)
{
fpgm = new FontProgram(this);
}
if (Seek(MaximumProfileTable.Tag) != -1)
{
maxp = new MaximumProfileTable(this);
}
if (Seek(NameTable.Tag) != -1)
{
name = new NameTable(this);
}
if (Seek(FontHeaderTable.Tag) != -1)
{
head = new FontHeaderTable(this);
}
if (Seek(HorizontalHeaderTable.Tag) != -1)
{
hhea = new HorizontalHeaderTable(this);
}
if (Seek(HorizontalMetricsTable.Tag) != -1)
{
hmtx = new HorizontalMetricsTable(this);
}
if (Seek(OS2Table.Tag) != -1)
{
os2 = new OS2Table(this);
}
if (Seek(PostScriptTable.Tag) != -1)
{
post = new PostScriptTable(this);
}
if (Seek(GlyphDataTable.Tag) != -1)
{
glyf = new GlyphDataTable(this);
}
if (Seek(IndexToLocationTable.Tag) != -1)
{
loca = new IndexToLocationTable(this);
}
if (Seek(GlyphSubstitutionTable.Tag) != -1)
{
gsub = new GlyphSubstitutionTable(this);
}
if (Seek(ControlValueProgram.Tag) != -1)
{
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;
}
}