/// <summary>
/// Maps a unicode to the index of the corresponding glyph.
/// See OpenType spec "cmap - Character To Glyph Index Mapping Table / Format 4: Segment mapping to delta values"
/// for details about this a little bit strange looking algorithm.
/// </summary>
public int CharCodeToGlyphIndex(char value)
{
try
{
CMap4 cmap = FontFace.cmap.cmap4;
int segCount = cmap.segCountX2 / 2;
int seg;
for (seg = 0; seg < segCount; seg++)
{
if (value <= cmap.endCount[seg])
{
break;
}
}
Debug.Assert(seg < segCount);
if (value < cmap.startCount[seg])
{
return(0);
}
if (cmap.idRangeOffs[seg] == 0)
{
return((value + cmap.idDelta[seg]) & 0xFFFF);
}
int idx = cmap.idRangeOffs[seg] / 2 + (value - cmap.startCount[seg]) - (segCount - seg);
Debug.Assert(idx >= 0 && idx < cmap.glyphCount);
if (cmap.glyphIdArray[idx] == 0)
{
return(0);
}
return((cmap.glyphIdArray[idx] + cmap.idDelta[seg]) & 0xFFFF);
}
catch
{
GetType();
throw;
}
}
internal void Read()
{
try
{
int tableOffset = this.fontData.Position;
this.version = this.fontData.ReadUShort();
this.numTables = this.fontData.ReadUShort();
bool success = false;
for (int idx = 0; idx < this.numTables; idx++)
{
PlatformId platformId = (PlatformId)this.fontData.ReadUShort();
WinEncodingId encodingId = (WinEncodingId)this.fontData.ReadUShort();
int offset = this.fontData.ReadLong();
int currentPosition = this.fontData.Position;
// Just read Windows stuff
if (platformId == PlatformId.Win && (encodingId == WinEncodingId.Symbol || encodingId == WinEncodingId.Unicode))
{
this.symbol = encodingId == WinEncodingId.Symbol;
this.fontData.Position = tableOffset + offset;
this.cmap4 = new CMap4(this.fontData, encodingId);
this.fontData.Position = currentPosition;
// We have found what we are looking for, so break.
success = true;
break;
}
}
if (!success)
{
throw new InvalidOperationException("Font has no usable platform or encoding ID. It cannot be used with PDFsharp.");
}
}
catch (Exception ex)
{
throw new PdfSharpException(PSSR.ErrorReadingFontData, ex);
}
}
internal void Read()
{
try
{
int tableOffset = _fontData.Position;
version = _fontData.ReadUShort();
numTables = _fontData.ReadUShort();
#if DEBUG_
if (_fontData.Name == "Cambria")
Debug-Break.Break();
#endif
bool success = false;
for (int idx = 0; idx < numTables; idx++)
{
PlatformId platformId = (PlatformId)_fontData.ReadUShort();
WinEncodingId encodingId = (WinEncodingId)_fontData.ReadUShort();
int offset = _fontData.ReadLong();
int currentPosition = _fontData.Position;
// Just read Windows stuff.
if (platformId == PlatformId.Win && (encodingId == WinEncodingId.Symbol || encodingId == WinEncodingId.Unicode))
{
symbol = encodingId == WinEncodingId.Symbol;
_fontData.Position = tableOffset + offset;
cmap4 = new CMap4(_fontData, encodingId);
_fontData.Position = currentPosition;
// We have found what we are looking for, so break.
success = true;
break;
}
}
if (!success)
throw new InvalidOperationException("Font has no usable platform or encoding ID. It cannot be used with PDFsharp.");
}
catch (Exception ex)
{
throw new InvalidOperationException(PSSR.ErrorReadingFontData, ex);
}
}
internal void Read()
{
try
{
int tableOffset = this.fontData.Position;
this.version = this.fontData.ReadUShort();
this.numTables = this.fontData.ReadUShort();
bool success = false;
for (int idx = 0; idx < this.numTables; idx++)
{
PlatformId platformId = (PlatformId)this.fontData.ReadUShort();
WinEncodingId encodingId = (WinEncodingId)this.fontData.ReadUShort();
int offset = this.fontData.ReadLong();
int currentPosition = this.fontData.Position;
// Just read Windows stuff
if (platformId == PlatformId.Win && (encodingId == WinEncodingId.Symbol || encodingId == WinEncodingId.Unicode))
{
this.symbol = encodingId == WinEncodingId.Symbol;
this.fontData.Position = tableOffset + offset;
this.cmap4 = new CMap4(this.fontData, encodingId);
this.fontData.Position = currentPosition;
// We have found what we are looking for, so break.
success = true;
break;
}
}
if (!success)
throw new InvalidOperationException("Font has no usable platform or encoding ID. It cannot be used with PDFsharp.");
}
catch (Exception ex)
{
throw new PdfSharpException(PSSR.ErrorReadingFontData, ex);
}
}