public Glyph GetGlyphData(ushort glyphId)
{
if (GlyphCache.ContainsKey(glyphId))
{
return(GlyphCache[glyphId]);
}
var dataOffset = font.loca.Offsets[glyphId];
var reader = new TrueTypeReader(Data);
reader.Seek(dataOffset);
var glyph = new Glyph()
{
NumberOfContours = reader.ReadShort(),
XMin = reader.ReadFWord(),
YMin = reader.ReadFWord(),
XMax = reader.ReadFWord(),
YMax = reader.ReadFWord()
};
reader.Dispose();
GlyphCache[glyphId] = glyph;
return(glyph);
}
public override void Process(TrueTypeFont font)
{
var reader = new TrueTypeReader(Data);
Version = reader.ReadUShort();
NumberOfTables = reader.ReadUShort();
Subtables = new List <KerningSubtableBase>(NumberOfTables);
for (var t = 0; t < NumberOfTables; t++)
{
var subtableOffset = reader.Position;
var version = reader.ReadUShort();
var length = reader.ReadUShort();
var coverage = reader.ReadUShort();
var subtableType = ImplementationTypeAttribute.GetTypeFromEnumValue(typeof(KerningSubtableType), GetSubtypeFromCoverage(coverage));
var subtable = Activator.CreateInstance(subtableType) as KerningSubtableBase;
subtable.ReadData(reader, (uint)subtableOffset, length);
Subtables.Add(subtable);
}
ProcessSubtables(font);
reader.Dispose();
}
public override void Process(TrueTypeFont font)
{
var reader = new TrueTypeReader(Data);
var version = reader.ReadUShort();
var length = reader.ReadUShort();
var coverage = reader.ReadUShort();
NumberOfPairs = reader.ReadUShort();
SearchRange = reader.ReadUShort();
EntrySelector = reader.ReadUShort();
RangeShift = reader.ReadUShort();
Kernpairs = new Dictionary <uint, short>(NumberOfPairs);
for (var i = 0; i < NumberOfPairs; i++)
{
var glyphPair = reader.ReadULong();
var kernUnits = reader.ReadFWord();
Kernpairs[glyphPair] = kernUnits;
}
reader.Dispose();
}
public override void Process(TrueTypeFont font)
{
var reader = new TrueTypeReader(Data);
Version = reader.ReadFixed();
NumberOfGlyphs = reader.ReadUShort();
reader.Dispose();
}
public override void Process(TrueTypeFont font)
{
var reader = new TrueTypeReader(Data);
var format = reader.ReadUShort();
var length = reader.ReadUShort();
var version = reader.ReadUShort();
DoubleSegCount = reader.ReadUShort();
SearchRange = reader.ReadUShort();
EntrySelector = reader.ReadUShort();
RangeShift = reader.ReadUShort();
EndCounts = new ushort[SegCount];
for (var i = 0; i < SegCount; i++)
{
EndCounts[i] = reader.ReadUShort();
}
ReservedPad = reader.ReadUShort();
StartCounts = new ushort[SegCount];
for (var i = 0; i < SegCount; i++)
{
StartCounts[i] = reader.ReadUShort();
}
IdDeltas = new ushort[SegCount];
for (var i = 0; i < SegCount; i++)
{
IdDeltas[i] = reader.ReadUShort();
}
IdRangeOffsets = new ushort[SegCount];
IdRangeOffsetPositions = new long[SegCount];
for (var i = 0; i < SegCount; i++)
{
IdRangeOffsetPositions[i] = reader.Position;
IdRangeOffsets[i] = reader.ReadUShort();
}
reader.Dispose();
}
public override void Process(TrueTypeFont font)
{
var reader = new TrueTypeReader(Data);
Version = reader.ReadUShort();
EncodingTableCount = reader.ReadUShort();
EncodingTables = new List <EncodingTableEntry>(EncodingTableCount);
for (var i = 0; i < EncodingTableCount; i++)
{
EncodingTables.Add(new EncodingTableEntry()
{
Platform = (Platform)reader.ReadUShort(),
Encoding = (Encoding)reader.ReadUShort(),
Offset = reader.ReadULong()
});
}
foreach (var encodingTable in EncodingTables)
{
reader.Seek(encodingTable.Offset);
var format = (CmapSubtableType)reader.ReadUShort();
var length = reader.ReadUShort();
var subtableProcessorType = ImplementationTypeAttribute.GetTypeFromEnumValue(typeof(CmapSubtableType), format);
if (subtableProcessorType == null)
{
continue;
}
var subtableProcessor = Activator.CreateInstance(subtableProcessorType) as CharacterToGlyphSubtableBase;
subtableProcessor.EncodingTableEntry = encodingTable;
subtableProcessor.ReadData(reader, encodingTable.Offset, length);
Subtables.Add(subtableProcessor);
}
ProcessSubtables(font);
reader.Dispose();
}
public override void ReadData(TrueTypeReader reader, uint offset, uint length)
{
// This weirdness is because some fonts have a malformed subtable header that lists the length incorrectly.
// The actual length can be calculated by peaking the number of kern pairs, and calculating it back.
reader.Seek(offset);
var version = reader.ReadUShort();
var len = reader.ReadUShort();
var coverage = reader.ReadUShort();
var numberOfPairs = reader.ReadUShort();
var kernpairLength = numberOfPairs * BytesPerKernpair;
var calculatedLength = kernpairLength + BytesInHeader;
if (calculatedLength != len)
{
Debug.WriteLine("ERROR: Detected kern subtable length does not match specified value. Using detected value.");
}
base.ReadData(reader, offset, (uint)calculatedLength);
}
public override void Process(TrueTypeFont font)
{
if (font.hhea == null)
{
throw new Exception("Table processing order error. Processing the hmtx table requires the hhea table.");
}
Metrics = new HorizontalMetric[font.hhea.NumberOfHorizontalMetrics];
var reader = new TrueTypeReader(Data);
for (var m = 0; m < Metrics.Length; m++)
{
Metrics[m] = new HorizontalMetric()
{
AdvanceWidth = reader.ReadUFWord(),
LeftSideBearing = reader.ReadFWord()
};
}
reader.Dispose();
}
public override void Process(TrueTypeFont font)
{
var offsetFormat = font.head.IndexToLocFormat;
var numberOfGlyphs = Data.Length / ((offsetFormat + 1) * 2);
Offsets = new Dictionary <ushort, uint>(numberOfGlyphs);
var reader = new TrueTypeReader(Data);
for (ushort i = 0; i < numberOfGlyphs; i++)
{
if ((LocationOffsetFormat)offsetFormat == LocationOffsetFormat.Short)
{
Offsets[i] = reader.ReadUShort();
}
else
{
Offsets[i] = reader.ReadULong();
}
}
reader.Dispose();
}
public override void Process(TrueTypeFont font)
{
var reader = new TrueTypeReader(Data);
Version = reader.ReadFixed();
Ascender = reader.ReadFWord();
Descender = reader.ReadFWord();
LineGap = reader.ReadFWord();
AdvanceWidthMax = reader.ReadUFWord();
MinLeftSideBearing = reader.ReadFWord();
MinRightSideBearing = reader.ReadFWord();
XMaxExtent = reader.ReadFWord();
CaretSlopeRise = reader.ReadShort();
CaretSlopeRun = reader.ReadShort();
Reserved0 = reader.ReadShort();
Reserved1 = reader.ReadShort();
Reserved2 = reader.ReadShort();
Reserved3 = reader.ReadShort();
Reserved4 = reader.ReadShort();
MetricDataFormat = reader.ReadShort();
NumberOfHorizontalMetrics = reader.ReadUShort();
reader.Dispose();
}
public override void Process(TrueTypeFont font)
{
var reader = new TrueTypeReader(Data);
Version = reader.ReadFixed();
Revision = reader.ReadFixed();
ChecksumAdjustment = reader.ReadULong();
Magic = reader.ReadULong();
Flags = reader.ReadUShort();
UnitsPerEm = reader.ReadUShort();
DateCreated = reader.ReadLongDateTime();
DateModified = reader.ReadLongDateTime();
XMin = reader.ReadFWord();
YMin = reader.ReadFWord();
XMax = reader.ReadFWord();
YMax = reader.ReadFWord();
MacStyle = reader.ReadUShort();
LowestRecommendedPPEM = reader.ReadUShort();
FontDirectionHint = reader.ReadShort();
IndexToLocFormat = reader.ReadShort();
GlyphDataFormat = reader.ReadShort();
reader.Dispose();
}
public override ushort GetGlyphId(ushort charCode)
{
ushort glyphId = 0;
/// You search for the first endCode that is greater than or equal to the character code you want to map.
/// If the corresponding startCode is less than or equal to the character code, then you use the corresponding
/// idDelta and idRangeOffset to map the character code to a glyph index (otherwise, the missingGlyph is returned).
ushort endCode = 0;
int segment = 0;
while (true)
{
endCode = EndCounts[segment];
if (endCode >= charCode)
{
break;
}
else
{
segment++;
}
}
var startCode = StartCounts[segment];
if (startCode <= charCode)
{
// use idDelta and idRangeOffset to map charcode to glyphindex
var idDelta = IdDeltas[segment];
var idRangeOffset = IdRangeOffsets[segment];
if (idRangeOffset == 0)
{
unchecked
{
glyphId = (ushort)(idDelta + charCode);
}
}
else
{
// use glyphIds data
var idStreamPosition = idRangeOffset + 2 * (charCode - startCode) + IdRangeOffsetPositions[segment];
ushort readGlyphValue;
using (var reader = new TrueTypeReader(base.Data))
{
reader.Seek(idStreamPosition);
readGlyphValue = reader.ReadUShort();
}
if (readGlyphValue != 0)
{
unchecked
{
glyphId = (ushort)(idDelta + readGlyphValue);
}
}
}
}
return(glyphId);
}
