/// <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 "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 ArrayList(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 = (HorizontalMetric) metrics[metrics.Count - 1];
for (int i = numberOfHMetrics; i < numGlyphs; i++) {
metrics.Add(
new HorizontalMetric(lastHMetric.AdvanceWidth, stream.ReadShort()));
}
}
}
/// <summary>
/// Writes the font subset to the supplied output stream.
/// </summary>
public void Generate(MemoryStream output)
{
HeaderTable head = reader.GetHeaderTable();
MaximumProfileTable maxp = reader.GetMaximumProfileTable();
HorizontalHeaderTable hhea = reader.GetHorizontalHeaderTable();
ControlValueTable cvt = reader.GetControlValueTable();
FontProgramTable fpgm = reader.GetFontProgramTable();
GlyfDataTable glyf = reader.GetGlyfDataTable();
ControlValueProgramTable prep = reader.GetControlValueProgramTable();
IndexToLocationTable loca = CreateLocaTable(glyf);
HorizontalMetricsTable hmtx = CreateHmtxTable(glyf);
// Since we're reusing the hhea and maxp tables, we must update
// the numberOfHMetrics and numGlyphs fields to reflect the reduced
// number of glyphs.
maxp.GlyphCount = glyf.Count;
hhea.HMetricCount = glyf.Count;
FontFileWriter writer = new FontFileWriter(output);
writer.Write(head);
writer.Write(maxp);
writer.Write(hhea);
writer.Write(hmtx);
writer.Write(cvt);
writer.Write(prep);
writer.Write(fpgm);
writer.Write(loca);
writer.Write(glyf);
writer.Close();
}
/// <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 "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());
}
}
