public static HorizontalMetricsTable Load(FontReader reader)
{
// you should load all dependent tables prior to manipulating the reader
HoizontalHeadTable headTable = reader.GetTable <HoizontalHeadTable>();
MaximumProfileTable profileTable = reader.GetTable <MaximumProfileTable>();
// move to start of table
using (BinaryReader binaryReader = reader.GetReaderAtTablePosition(TableName))
{
return(Load(binaryReader, headTable.NumberOfHMetrics, profileTable.GlyphCount));
}
}
public static void WriteHoizontalHeadTable(this BinaryWriter writer, HoizontalHeadTable table)
{
// Type | Name | Description
// ----------|----------------------|----------------------------------------------------------------------------------------------------
// uint16 | majorVersion | Major version number of the horizontal header table — set to 1.
// uint16 | minorVersion | Minor version number of the horizontal header table — set to 0.
// FWORD | Ascender | Typographic ascent (Distance from baseline of highest ascender).
// FWORD | Descender | Typographic descent (Distance from baseline of lowest descender).
// FWORD | LineGap | Typographic line gap. - Negative LineGap values are treated as zero in Windows 3.1, and in Mac OS System 6 and System 7.
// UFWORD | advanceWidthMax | Maximum advance width value in 'hmtx' table.
// FWORD | minLeftSideBearing | Minimum left sidebearing value in 'hmtx' table.
// FWORD | minRightSideBearing | Minimum right sidebearing value; calculated as Min(aw - lsb - (xMax - xMin)).
// FWORD | xMaxExtent | Max(lsb + (xMax - xMin)).
// int16 | caretSlopeRise | Used to calculate the slope of the cursor (rise/run); 1 for vertical.
// int16 | caretSlopeRun | 0 for vertical.
// int16 | caretOffset | The amount by which a slanted highlight on a glyph needs to be shifted to produce the best appearance. Set to 0 for non-slanted fonts
// int16 | (reserved) | set to 0
// int16 | (reserved) | set to 0
// int16 | (reserved) | set to 0
// int16 | (reserved) | set to 0
// int16 | metricDataFormat | 0 for current format.
// uint16 | numberOfHMetrics | Number of hMetric entries in 'hmtx' table
writer.WriteUInt16(1);
writer.WriteUInt16(1);
writer.WriteFWORD(table.Ascender);
writer.WriteFWORD(table.Descender);
writer.WriteFWORD(table.LineGap);
writer.WriteUFWORD(table.AdvanceWidthMax);
writer.WriteFWORD(table.MinLeftSideBearing);
writer.WriteFWORD(table.MinRightSideBearing);
writer.WriteFWORD(table.XMaxExtent);
writer.WriteInt16(table.CaretSlopeRise);
writer.WriteInt16(table.CaretSlopeRun);
writer.WriteInt16(table.CaretOffset);
writer.WriteInt16(0); // reserved
writer.WriteInt16(0); // reserved
writer.WriteInt16(0); // reserved
writer.WriteInt16(0); // reserved
writer.WriteInt16(0); // metricDataFormat should be 0
writer.WriteUInt16(table.NumberOfHMetrics);
}
public void LoadHoizontalHeadTable()
{
var writer = new BinaryWriter();
writer.WriteHoizontalHeadTable(new HoizontalHeadTable(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11));
HoizontalHeadTable tbl = HoizontalHeadTable.Load(writer.GetReader());
Assert.Equal(1, tbl.Ascender);
Assert.Equal(2, tbl.Descender);
Assert.Equal(3, tbl.LineGap);
Assert.Equal(4, tbl.AdvanceWidthMax);
Assert.Equal(5, tbl.MinLeftSideBearing);
Assert.Equal(6, tbl.MinRightSideBearing);
Assert.Equal(7, tbl.XMaxExtent);
Assert.Equal(8, tbl.CaretSlopeRise);
Assert.Equal(9, tbl.CaretSlopeRun);
Assert.Equal(10, tbl.CaretOffset);
Assert.Equal(11, tbl.NumberOfHMetrics);
}
