private static Glyph ReadGlyph(FontStreamReader reader)
{
var numberOfContours = reader.ReadInt16();
var isCompound = numberOfContours < 0;
var xMin = reader.ReadFWord();
var yMin = reader.ReadFWord();
var xMax = reader.ReadFWord();
var yMax = reader.ReadFWord();
if (isCompound)
{
return(ReadCompoundGlyph(reader, xMin, yMin, xMax, yMax));
}
return(ReadSimpleGlyph(reader, numberOfContours, xMin, yMin, xMax, yMax));
}
private static Glyph ReadCompoundGlyph(FontStreamReader reader, ushort xMin, ushort yMin, ushort xMax, ushort yMax)
{
var components = new List <CompoundGlyph.Component>();
var flags = GlyphComponentFlags.MoreComponents;
while (flags.HasFlag(GlyphComponentFlags.MoreComponents))
{
flags = (GlyphComponentFlags)reader.ReadUInt16();
var glyphIndex = reader.ReadInt16();
if (flags.HasFlag(GlyphComponentFlags.WeHaveInstructions) && flags.HasFlag(GlyphComponentFlags.MoreComponents))
{
throw new NotImplementedException();
}
var arg1 = flags.HasFlag(GlyphComponentFlags.Arg12AreWords) ? reader.ReadInt16() : reader.ReadUInt8();
var arg2 = flags.HasFlag(GlyphComponentFlags.Arg12AreWords) ? reader.ReadInt16() : reader.ReadUInt8();
var matrix = new decimal[] {
1, 0,
0, 1,
0, 0
};
short?destPointIndex = null;
short?srcPointIndex = null;
if (flags.HasFlag(GlyphComponentFlags.ArgsAreXYValues))
{
matrix[4] = arg1;
matrix[5] = arg2;
}
else
{
destPointIndex = arg1;
srcPointIndex = arg1;
}
if (flags.HasFlag(GlyphComponentFlags.WeHaveAScale))
{
matrix[0] = matrix[3] = reader.ReadF2Dot14();
}
else if (flags.HasFlag(GlyphComponentFlags.WeHaveAnXYScale))
{
matrix[0] = reader.ReadF2Dot14();
matrix[3] = reader.ReadF2Dot14();
}
else if (flags.HasFlag(GlyphComponentFlags.WeHave2By2))
{
matrix[0] = reader.ReadF2Dot14();
matrix[1] = reader.ReadF2Dot14();
matrix[2] = reader.ReadF2Dot14();
matrix[3] = reader.ReadF2Dot14();
}
components.Add(new CompoundGlyph.Component(glyphIndex, matrix, destPointIndex, srcPointIndex));
}
var instructions = new byte[0];
if (flags.HasFlag(GlyphComponentFlags.WeHaveInstructions))
{
var instructionLength = reader.ReadUInt16();
instructions = reader.ReadArray <byte>(instructionLength, r => r.ReadUInt8);
}
return(new CompoundGlyph(components, instructions));
}
private static Glyph ReadSimpleGlyph(FontStreamReader reader, short numberOfContours, ushort xMin, ushort yMin, ushort xMax, ushort yMax)
{
var endPoints = reader.ReadArray <ushort>((ushort)numberOfContours, r => r.ReadUInt16);
var instructionLength = reader.ReadUInt16();
var instructions = reader.ReadArray <byte>(instructionLength, r => r.ReadUInt8);
if (numberOfContours == 0)
{
return(new SimpleGlyph(xMin, yMin, xMax, yMax, endPoints, instructions, new Point[0]));
}
var numberOfPoints = endPoints.Max() + 1;
var flags = new SimpleGlyphFlags[numberOfPoints];
var points = new Point[numberOfPoints];
for (var i = 0; i < numberOfPoints; i++)
{
var flag = (SimpleGlyphFlags)reader.ReadUInt8();
flags[i] = flag;
points[i] = new Point {
OnCurve = flag.HasFlag(SimpleGlyphFlags.OnCurve)
};
if (flag.HasFlag(SimpleGlyphFlags.Repeat))
{
var count = reader.ReadUInt8();
while (count-- > 0)
{
flags[++i] = flag;
points[i] = new Point {
OnCurve = flag.HasFlag(SimpleGlyphFlags.OnCurve)
};
}
}
}
// read X
short value = 0;
for (var i = 0; i < numberOfPoints; i++)
{
var flag = flags[i];
if (flag.HasFlag(SimpleGlyphFlags.XShort))
{
if (flag.HasFlag(SimpleGlyphFlags.XSame))
{
value += reader.ReadUInt8();
}
else
{
value -= reader.ReadUInt8();
}
}
else if (!flag.HasFlag(SimpleGlyphFlags.XSame))
{
value += reader.ReadInt16();
}
points[i].X = value;
}
// read Y
value = 0;
for (var i = 0; i < numberOfPoints; i++)
{
var flag = flags[i];
if (flag.HasFlag(SimpleGlyphFlags.YShort))
{
if (flag.HasFlag(SimpleGlyphFlags.YSame))
{
value += reader.ReadUInt8();
}
else
{
value -= reader.ReadUInt8();
}
}
else if (!flag.HasFlag(SimpleGlyphFlags.YSame))
{
value += reader.ReadInt16();
}
points[i].Y = value;
}
return(new SimpleGlyph(xMin, yMin, xMax, yMax, endPoints, instructions, points));
}