public TrueTypeFont(Header header, Maxp maxp, Loca loca, Glyf glyf)
{
Header = header;
Maxp = maxp;
Loca = loca;
Glyf = glyf;
}
private Glyf ExtractAsGlyf(BinaryReader reader, int numGlyphs, Loca loca, Table table)
{
//see: https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6glyf.html
var glyphs = new Glyph[numGlyphs];
for (int i = 0; i < numGlyphs; i++)
{
reader.BaseStream.Seek(table.Offset, SeekOrigin.Begin);
reader.BaseStream.Seek(loca.Offsets[i], SeekOrigin.Current);
var length = loca.Offsets[i + 1] - loca.Offsets[i];
if (length > 0)
{
var numberOfContours = reader.ReadInt16();
var xMin = reader.ReadInt16();
var yMin = reader.ReadInt16();
var xMax = reader.ReadInt16();
var yMax = reader.ReadInt16();
if (numberOfContours >= 0)
{
//If the number of contours is positive or zero, it is a single glyph;
glyphs[i] = ReadSimpleGlyph(reader, numberOfContours, xMin, yMin, xMax, yMax);
}
else
{
//If the number of contours less than zero, the glyph is compound
glyphs[i] = ReadCompoundGlyph(reader, -numberOfContours, xMin, yMin, xMax, yMax);
}
}
else
{
glyphs[i] = Glyph.Empty;
}
}
return new Glyf(
glyphs
);
}