/// <summary>
/// Reads the contents of the "hmtx" table from the supplied stream
/// at the current position.
/// </summary>
/// <param name="reader"></param>
protected internal override void Read(FontFileReader reader)
{
FontFileStream stream = reader.Stream;
// Obtain number of horizonal metrics from 'hhea' table
int numberOfHMetrics = reader.GetHorizontalHeaderTable().HMetricCount;
// Obtain glyph count from 'maxp' table
int numGlyphs = reader.GetMaximumProfileTable().GlyphCount;
// Metrics might not be supplied for each glyph. For example, if
// the font is monospaced the hMetrics array will only contain a
// single entry
int metricsSize = (numGlyphs > numberOfHMetrics) ? numGlyphs : numberOfHMetrics;
metrics = new List <HorizontalMetric>();//(metricsSize);
for (int i = 0; i < numberOfHMetrics; i++)
{
metrics.Add(new HorizontalMetric(stream.ReadUShort(), stream.ReadShort()));
}
// Fill in missing widths
if (numberOfHMetrics < metricsSize)
{
HorizontalMetric lastHMetric = metrics[metrics.Count - 1];
for (int i = numberOfHMetrics; i < numGlyphs; i++)
{
metrics.Add(
new HorizontalMetric(lastHMetric.AdvanceWidth, stream.ReadShort()));
}
}
}
/// <summary>
/// Reads the contents of the "name" table from the supplied stream
/// at the current position.
/// </summary>
/// <param name="reader"></param>
protected internal override void Read(FontFileReader reader)
{
FontFileStream stream = reader.Stream;
// Ignore format selector field
stream.ReadUShort();
// Number of name records
int numRecords = stream.ReadUShort();
// Offset to start of string storage (from start of table).
storageOffset = stream.ReadUShort();
for (int i = 0; i < numRecords; i++)
{
int platformID = stream.ReadUShort();
int encodingID = stream.ReadUShort();
int languageID = stream.ReadUShort();
int nameID = stream.ReadUShort();
int length = stream.ReadUShort();
int stringOffset = stream.ReadUShort();
// Only interested in name records for Microsoft platform,
// Unicode encoding and US English language.
if (platformID == MicrosoftPlatformID &&
(encodingID == SymbolEncoding || encodingID == UnicodeEncoding) &&
languageID == EnglishAmericanLanguage)
{
switch (nameID)
{
case FamilyNameID:
familyName = ReadString(stream, stringOffset, length);
break;
case FullNameID:
fullName = ReadString(stream, stringOffset, length);
break;
}
if (familyName != String.Empty && fullName != String.Empty)
{
break;
}
}
}
}
/// <summary>
/// Reads the contents of the "head" table from the current position
/// in the supplied stream.
/// </summary>
/// <param name="reader"></param>
protected internal override void Read(FontFileReader reader)
{
FontFileStream stream = reader.Stream;
versionNo = stream.ReadFixed();
fontRevision = stream.ReadFixed();
checkSumAdjustment = stream.ReadULong();
magicNumber = stream.ReadULong();
flags = stream.ReadUShort();
unitsPermEm = stream.ReadUShort();
// Some fonts have dodgy date offsets that cause AddSeconds to throw an exception
createDate = GetDate(stream.ReadLongDateTime());
updateDate = GetDate(stream.ReadLongDateTime());
xMin = stream.ReadShort();
yMin = stream.ReadShort();
xMax = stream.ReadShort();
yMax = stream.ReadShort();
macStyle = stream.ReadUShort();
lowestRecPPEM = stream.ReadUShort();
fontDirectionHint = stream.ReadShort();
indexToLocFormat = stream.ReadShort();
glyphDataFormat = stream.ReadShort();
}
/// <summary>
/// Reads the contents of the "loca" table from the supplied stream
/// at the current position.
/// </summary>
/// <param name="reader"></param>
protected internal override void Read(FontFileReader reader)
{
FontFileStream stream = reader.Stream;
// Glyph offsets can be stored in either short of long format
bool isShortFormat = reader.GetHeaderTable().IsShortFormat;
// Number of glyphs including extra entry
int glyphCount = reader.GetMaximumProfileTable().GlyphCount + 1;
offsets = new ArrayList(glyphCount);
for (int i = 0; i < glyphCount; i++)
{
offsets.Insert(i, (isShortFormat) ? (uint)(stream.ReadUShort() << 1) : stream.ReadULong());
}
}
/// <summary>
/// Reads the contents of the "kern" table from the current position
/// in the supplied stream.
/// </summary>
/// <param name="reader"></param>
protected internal override void Read(FontFileReader reader)
{
FontFileStream stream = reader.Stream;
// Skip version field
stream.Skip(PrimitiveSizes.UShort);
// Number of subtables
int numTables = stream.ReadUShort();
for (int i = 0; i < numTables; i++)
{
// Another pesky version field
stream.Skip(PrimitiveSizes.UShort);
// Length of the subtable, in bytes (including header).
ushort length = stream.ReadUShort();
// Type of information is contained in this table.
ushort coverage = stream.ReadUShort();
// Only interested in horiztonal kerning values in format 0
if ((coverage & HoriztonalMask) == 1 &&
(coverage & MinimumMask) == 0 &&
((coverage >> 8) == 0))
{
// The number of kerning pairs in the table.
int numPairs = stream.ReadUShort();
hasKerningInfo = true;
pairs = new KerningPairs(numPairs);
// Skip pointless shit
stream.Skip(3 * PrimitiveSizes.UShort);
for (int j = 0; j < numPairs; j++)
{
pairs.Add(
stream.ReadUShort(), // Left glyph index
stream.ReadUShort(), // Right glyph index
stream.ReadFWord()); // Kerning amount
}
}
else
{
stream.Skip(length - 3 * PrimitiveSizes.UShort);
}
}
}
protected internal void Read(FontFileStream stream) {
// Skip sfnt version (0x00010000 for version 1.0).
stream.Skip(PrimitiveSizes.Fixed);
// Number of tables
int numTables = stream.ReadUShort();
// Skip searchRange, entrySelector and rangeShift entries (3 x ushort)
stream.Skip(PrimitiveSizes.UShort*3);
directoryEntries = new Hashtable(numTables);
for (int i = 0; i < numTables; i++) {
DirectoryEntry entry = new DirectoryEntry(
stream.ReadTag(), // 4-byte identifier.
stream.ReadULong(), // CheckSum for this table.
stream.ReadULong(), // Offset from beginning of TrueType font file.
stream.ReadULong() // Length of this table.
);
directoryEntries.Add(entry.TableName, entry);
}
}
/// <summary>
/// Reads the contents of the "hhea" table from the current position
/// in the supplied stream.
/// </summary>
/// <param name="reader"></param>
protected internal override void Read(FontFileReader reader)
{
FontFileStream stream = reader.Stream;
versionNo = stream.ReadFixed();
ascender = stream.ReadFWord();
decender = stream.ReadFWord();
lineGap = stream.ReadFWord();
advanceWidthMax = stream.ReadUFWord();
minLeftSideBearing = stream.ReadFWord();
minRightSideBearing = stream.ReadFWord();
xMaxExtent = stream.ReadFWord();
caretSlopeRise = stream.ReadShort();
caretSlopeRun = stream.ReadShort();
caretOffset = stream.ReadShort();
stream.ReadShort();
stream.ReadShort();
stream.ReadShort();
stream.ReadShort();
metricDataFormat = stream.ReadShort();
numberOfHMetrics = stream.ReadUShort();
}
protected internal void Read(FontFileStream stream)
{
// Skip sfnt version (0x00010000 for version 1.0).
stream.Skip(PrimitiveSizes.Fixed);
// Number of tables
int numTables = stream.ReadUShort();
// Skip searchRange, entrySelector and rangeShift entries (3 x ushort)
stream.Skip(PrimitiveSizes.UShort * 3);
directoryEntries = new Hashtable(numTables);
for (int i = 0; i < numTables; i++)
{
DirectoryEntry entry = new DirectoryEntry(
stream.ReadTag(), // 4-byte identifier.
stream.ReadULong(), // CheckSum for this table.
stream.ReadULong(), // Offset from beginning of TrueType font file.
stream.ReadULong() // Length of this table.
);
directoryEntries.Add(entry.TableName, entry);
}
}
/// <summary>
/// Reads the contents of the "os/2" table from the supplied stream
/// at the current position.
/// </summary>
/// <param name="reader"></param>
protected internal override void Read(FontFileReader reader)
{
FontFileStream stream = reader.Stream;
version = stream.ReadUShort();
avgCharWidth = stream.ReadShort();
usWeightClass = stream.ReadUShort();
usWidthClass = stream.ReadUShort();
// According to the OpenType spec, bit 0 must be zero.
fsType = (ushort)(stream.ReadUShort() & ~1);
subscriptXSize = stream.ReadShort();
subscriptYSize = stream.ReadShort();
subscriptXOffset = stream.ReadShort();
subscriptYOffset = stream.ReadShort();
superscriptXSize = stream.ReadShort();
superscriptYSize = stream.ReadShort();
superscriptXOffset = stream.ReadShort();
superscriptYOffset = stream.ReadShort();
strikeoutSize = stream.ReadShort();
strikeoutPosition = stream.ReadShort();
short familyClass = stream.ReadShort();
classID = (byte)(familyClass >> 8);
subclassID = (byte)(familyClass & 255);
stream.Read(panose, 0, panose.Length);
unicodeRange1 = stream.ReadULong();
unicodeRange2 = stream.ReadULong();
unicodeRange3 = stream.ReadULong();
unicodeRange4 = stream.ReadULong();
vendorID[0] = stream.ReadChar();
vendorID[1] = stream.ReadChar();
vendorID[2] = stream.ReadChar();
vendorID[3] = stream.ReadChar();
fsSelection = stream.ReadUShort();
usFirstCharIndex = stream.ReadUShort();
usLastCharIndex = stream.ReadUShort();
typoAscender = stream.ReadShort();
typoDescender = stream.ReadShort();
typoLineGap = stream.ReadShort();
usWinAscent = stream.ReadUShort();
usWinDescent = stream.ReadUShort();
codePageRange1 = stream.ReadULong();
codePageRange2 = stream.ReadULong();
sxHeight = stream.ReadShort();
sCapHeight = stream.ReadShort();
usDefaultChar = stream.ReadUShort();
usBreakChar = stream.ReadUShort();
usMaxContext = stream.ReadUShort();
}
/// <summary>
/// Reads the contents of the "maxp" table from the supplied stream
/// at the current position.
/// </summary>
/// <param name="reader"></param>
protected internal override void Read(FontFileReader reader)
{
FontFileStream stream = reader.Stream;
// These two fields are common to versions 0.5 and 1.0
versionNo = stream.ReadFixed();
numGlyphs = stream.ReadUShort();
// Version 1.0 of this table contains more data
if (versionNo == 0x00010000)
{
maxPoints = stream.ReadUShort();
maxContours = stream.ReadUShort();
maxCompositePoints = stream.ReadUShort();
maxCompositeContours = stream.ReadUShort();
maxZones = stream.ReadUShort();
maxTwilightPoints = stream.ReadUShort();
maxStorage = stream.ReadUShort();
maxFunctionDefs = stream.ReadUShort();
maxInstructionDefs = stream.ReadUShort();
maxStackElements = stream.ReadUShort();
maxSizeOfInstructions = stream.ReadUShort();
maxComponentElements = stream.ReadUShort();
maxComponentDepth = stream.ReadUShort();
}
}
