static CompositeGlyph ReadCompositeGlyph(DataReader reader)
{
// we need to keep reading glyphs for as long as
// our flags tell us that there are more to read
var subglyphs = new List <Subglyph>();
CompositeGlyphFlags flags;
do
{
flags = (CompositeGlyphFlags)reader.ReadUInt16BE();
var subglyph = new Subglyph {
Flags = flags
};
subglyph.Index = reader.ReadUInt16BE();
// read in args; they vary in size based on flags
if ((flags & CompositeGlyphFlags.ArgsAreWords) != 0)
{
subglyph.Arg1 = reader.ReadInt16BE();
subglyph.Arg2 = reader.ReadInt16BE();
}
else
{
subglyph.Arg1 = reader.ReadSByte();
subglyph.Arg2 = reader.ReadSByte();
}
// figure out the transform; we can either have no scale, a uniform
// scale, two independent scales, or a full 2x2 transform matrix
// transform components are in 2.14 fixed point format
var transform = Matrix3x2.Identity;
if ((flags & CompositeGlyphFlags.HaveScale) != 0)
{
var scale = reader.ReadInt16BE() / F2Dot14ToFloat;
transform.M11 = scale;
transform.M22 = scale;
}
else if ((flags & CompositeGlyphFlags.HaveXYScale) != 0)
{
transform.M11 = reader.ReadInt16BE() / F2Dot14ToFloat;
transform.M22 = reader.ReadInt16BE() / F2Dot14ToFloat;
}
else if ((flags & CompositeGlyphFlags.HaveTransform) != 0)
{
transform.M11 = reader.ReadInt16BE() / F2Dot14ToFloat;
transform.M12 = reader.ReadInt16BE() / F2Dot14ToFloat;
transform.M21 = reader.ReadInt16BE() / F2Dot14ToFloat;
transform.M22 = reader.ReadInt16BE() / F2Dot14ToFloat;
}
subglyph.Transform = transform;
subglyphs.Add(subglyph);
} while ((flags & CompositeGlyphFlags.MoreComponents) != 0);
var result = new CompositeGlyph {
Subglyphs = subglyphs.ToArray()
};
// if we have instructions, read them now
if ((flags & CompositeGlyphFlags.HaveInstructions) != 0)
{
var instructionLength = reader.ReadUInt16BE();
result.Instructions = reader.ReadBytes(instructionLength);
}
return(result);
}
static SimpleGlyph ReadSimpleGlyph(DataReader reader, int contourCount)
{
// read contour endpoints
var contours = new int[contourCount];
var lastEndpoint = reader.ReadUInt16BE();
contours[0] = lastEndpoint;
for (int i = 1; i < contours.Length; i++)
{
var endpoint = reader.ReadUInt16BE();
contours[i] = endpoint;
if (contours[i] <= lastEndpoint)
{
throw new InvalidFontException("Glyph contour endpoints are unordered.");
}
lastEndpoint = endpoint;
}
// the last contour's endpoint is the number of points in the glyph
var pointCount = lastEndpoint + 1;
var points = new Point[pointCount];
// read instruction data
var instructionLength = reader.ReadUInt16BE();
var instructions = reader.ReadBytes(instructionLength);
// read flags
var flags = new SimpleGlyphFlags[pointCount];
int flagIndex = 0;
while (flagIndex < flags.Length)
{
var f = (SimpleGlyphFlags)reader.ReadByte();
flags[flagIndex++] = f;
// if Repeat is set, this flag data is repeated n more times
if ((f & SimpleGlyphFlags.Repeat) != 0)
{
var count = reader.ReadByte();
for (int i = 0; i < count; i++)
{
flags[flagIndex++] = f;
}
}
}
// Read points, first doing all X coordinates and then all Y coordinates.
// The point packing is insane; coords are either 1 byte or 2; they're
// deltas from previous point, and flags let you repeat identical points.
var x = 0;
for (int i = 0; i < points.Length; i++)
{
var f = flags[i];
var delta = 0;
if ((f & SimpleGlyphFlags.ShortX) != 0)
{
delta = reader.ReadByte();
if ((f & SimpleGlyphFlags.SameX) == 0)
{
delta = -delta;
}
}
else if ((f & SimpleGlyphFlags.SameX) == 0)
{
delta = reader.ReadInt16BE();
}
x += delta;
points[i].X = (FUnit)x;
}
var y = 0;
for (int i = 0; i < points.Length; i++)
{
var f = flags[i];
var delta = 0;
if ((f & SimpleGlyphFlags.ShortY) != 0)
{
delta = reader.ReadByte();
if ((f & SimpleGlyphFlags.SameY) == 0)
{
delta = -delta;
}
}
else if ((f & SimpleGlyphFlags.SameY) == 0)
{
delta = reader.ReadInt16BE();
}
y += delta;
points[i].Y = (FUnit)y;
points[i].Type = (f & SimpleGlyphFlags.OnCurve) != 0 ? PointType.OnCurve : PointType.Quadratic;
}
return(new SimpleGlyph {
Points = points,
ContourEndpoints = contours,
Instructions = instructions
});
}
static string ExtractString(DataReader reader, uint baseOffset, StringData data)
{
reader.Seek(baseOffset + data.Offset);
var bytes = reader.ReadBytes(data.Length);
return Encoding.BigEndianUnicode.GetString(bytes);
}
static CompositeGlyph ReadCompositeGlyph(DataReader reader)
{
// we need to keep reading glyphs for as long as
// our flags tell us that there are more to read
var subglyphs = new List<Subglyph>();
CompositeGlyphFlags flags;
do
{
flags = (CompositeGlyphFlags)reader.ReadUInt16BE();
var subglyph = new Subglyph { Flags = flags };
subglyph.Index = reader.ReadUInt16BE();
// read in args; they vary in size based on flags
if ((flags & CompositeGlyphFlags.ArgsAreWords) != 0)
{
subglyph.Arg1 = reader.ReadInt16BE();
subglyph.Arg2 = reader.ReadInt16BE();
}
else
{
subglyph.Arg1 = reader.ReadSByte();
subglyph.Arg2 = reader.ReadSByte();
}
// figure out the transform; we can either have no scale, a uniform
// scale, two independent scales, or a full 2x2 transform matrix
// transform components are in 2.14 fixed point format
var transform = Matrix3x2.Identity;
if ((flags & CompositeGlyphFlags.HaveScale) != 0)
{
var scale = reader.ReadInt16BE() / F2Dot14ToFloat;
transform.M11 = scale;
transform.M22 = scale;
}
else if ((flags & CompositeGlyphFlags.HaveXYScale) != 0)
{
transform.M11 = reader.ReadInt16BE() / F2Dot14ToFloat;
transform.M22 = reader.ReadInt16BE() / F2Dot14ToFloat;
}
else if ((flags & CompositeGlyphFlags.HaveTransform) != 0)
{
transform.M11 = reader.ReadInt16BE() / F2Dot14ToFloat;
transform.M12 = reader.ReadInt16BE() / F2Dot14ToFloat;
transform.M21 = reader.ReadInt16BE() / F2Dot14ToFloat;
transform.M22 = reader.ReadInt16BE() / F2Dot14ToFloat;
}
subglyph.Transform = transform;
subglyphs.Add(subglyph);
} while ((flags & CompositeGlyphFlags.MoreComponents) != 0);
var result = new CompositeGlyph { Subglyphs = subglyphs.ToArray() };
// if we have instructions, read them now
if ((flags & CompositeGlyphFlags.HaveInstructions) != 0)
{
var instructionLength = reader.ReadUInt16BE();
result.Instructions = reader.ReadBytes(instructionLength);
}
return result;
}
static SimpleGlyph ReadSimpleGlyph(DataReader reader, int contourCount)
{
// read contour endpoints
var contours = new int[contourCount];
var lastEndpoint = reader.ReadUInt16BE();
contours[0] = lastEndpoint;
for (int i = 1; i < contours.Length; i++)
{
var endpoint = reader.ReadUInt16BE();
contours[i] = endpoint;
if (contours[i] <= lastEndpoint)
throw new InvalidFontException("Glyph contour endpoints are unordered.");
lastEndpoint = endpoint;
}
// the last contour's endpoint is the number of points in the glyph
var pointCount = lastEndpoint + 1;
var points = new Point[pointCount];
// read instruction data
var instructionLength = reader.ReadUInt16BE();
var instructions = reader.ReadBytes(instructionLength);
// read flags
var flags = new SimpleGlyphFlags[pointCount];
int flagIndex = 0;
while (flagIndex < flags.Length)
{
var f = (SimpleGlyphFlags)reader.ReadByte();
flags[flagIndex++] = f;
// if Repeat is set, this flag data is repeated n more times
if ((f & SimpleGlyphFlags.Repeat) != 0)
{
var count = reader.ReadByte();
for (int i = 0; i < count; i++)
flags[flagIndex++] = f;
}
}
// Read points, first doing all X coordinates and then all Y coordinates.
// The point packing is insane; coords are either 1 byte or 2; they're
// deltas from previous point, and flags let you repeat identical points.
var x = 0;
for (int i = 0; i < points.Length; i++)
{
var f = flags[i];
var delta = 0;
if ((f & SimpleGlyphFlags.ShortX) != 0)
{
delta = reader.ReadByte();
if ((f & SimpleGlyphFlags.SameX) == 0)
delta = -delta;
}
else if ((f & SimpleGlyphFlags.SameX) == 0)
delta = reader.ReadInt16BE();
x += delta;
points[i].X = (FUnit)x;
}
var y = 0;
for (int i = 0; i < points.Length; i++)
{
var f = flags[i];
var delta = 0;
if ((f & SimpleGlyphFlags.ShortY) != 0)
{
delta = reader.ReadByte();
if ((f & SimpleGlyphFlags.SameY) == 0)
delta = -delta;
}
else if ((f & SimpleGlyphFlags.SameY) == 0)
delta = reader.ReadInt16BE();
y += delta;
points[i].Y = (FUnit)y;
points[i].Type = (f & SimpleGlyphFlags.OnCurve) != 0 ? PointType.OnCurve : PointType.Quadratic;
}
return new SimpleGlyph
{
Points = points,
ContourEndpoints = contours,
Instructions = instructions
};
}
public static byte[] ReadProgram(DataReader reader, TableRecord[] tables, FourCC tag)
{
var index = FindTable(tables, tag);
if (index == -1)
return null;
reader.Seek(tables[index].Offset);
return reader.ReadBytes((int)tables[index].Length);
}