public unsafe static SbitTable Read(DataReader reader, TableRecord[] tables)
{
if (!SfntTables.SeekToTable(reader, tables, FourCC.Eblc))
return null;
// skip version
var baseOffset = reader.Position;
reader.Skip(sizeof(int));
// load each strike table
var count = reader.ReadInt32BE();
if (count > MaxBitmapStrikes)
throw new InvalidFontException("Too many bitmap strikes in font.");
var sizeTableHeaders = stackalloc BitmapSizeTable[count];
for (int i = 0; i < count; i++)
{
sizeTableHeaders[i].SubTableOffset = reader.ReadUInt32BE();
sizeTableHeaders[i].SubTableSize = reader.ReadUInt32BE();
sizeTableHeaders[i].SubTableCount = reader.ReadUInt32BE();
// skip colorRef, metrics entries, start and end glyph indices
reader.Skip(sizeof(uint) + sizeof(ushort) * 2 + 12 * 2);
sizeTableHeaders[i].PpemX = reader.ReadByte();
sizeTableHeaders[i].PpemY = reader.ReadByte();
sizeTableHeaders[i].BitDepth = reader.ReadByte();
sizeTableHeaders[i].Flags = (BitmapSizeFlags)reader.ReadByte();
}
// read index subtables
var indexSubTables = stackalloc IndexSubTable[count];
for (int i = 0; i < count; i++)
{
reader.Seek(baseOffset + sizeTableHeaders[i].SubTableOffset);
indexSubTables[i] = new IndexSubTable
{
FirstGlyph = reader.ReadUInt16BE(),
LastGlyph = reader.ReadUInt16BE(),
Offset = reader.ReadUInt32BE()
};
}
// read the actual data for each strike table
for (int i = 0; i < count; i++)
{
// read the subtable header
reader.Seek(baseOffset + sizeTableHeaders[i].SubTableOffset + indexSubTables[i].Offset);
var indexFormat = reader.ReadUInt16BE();
var imageFormat = reader.ReadUInt16BE();
var imageDataOffset = reader.ReadUInt32BE();
}
return null;
}
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 unsafe static SbitTable Read(DataReader reader, TableRecord[] tables)
{
if (!SfntTables.SeekToTable(reader, tables, FourCC.Eblc))
{
return(null);
}
// skip version
var baseOffset = reader.Position;
reader.Skip(sizeof(int));
// load each strike table
var count = reader.ReadInt32BE();
if (count > MaxBitmapStrikes)
{
throw new Exception("Too many bitmap strikes in font.");
}
var sizeTableHeaders = stackalloc BitmapSizeTable[count];
for (int i = 0; i < count; i++)
{
sizeTableHeaders[i].SubTableOffset = reader.ReadUInt32BE();
sizeTableHeaders[i].SubTableSize = reader.ReadUInt32BE();
sizeTableHeaders[i].SubTableCount = reader.ReadUInt32BE();
// skip colorRef, metrics entries, start and end glyph indices
reader.Skip(sizeof(uint) + sizeof(ushort) * 2 + 12 * 2);
sizeTableHeaders[i].PpemX = reader.ReadByte();
sizeTableHeaders[i].PpemY = reader.ReadByte();
sizeTableHeaders[i].BitDepth = reader.ReadByte();
sizeTableHeaders[i].Flags = (BitmapSizeFlags)reader.ReadByte();
}
// read index subtables
var indexSubTables = stackalloc IndexSubTable[count];
for (int i = 0; i < count; i++)
{
reader.Seek(baseOffset + sizeTableHeaders[i].SubTableOffset);
indexSubTables[i] = new IndexSubTable
{
FirstGlyph = reader.ReadUInt16BE(),
LastGlyph = reader.ReadUInt16BE(),
Offset = reader.ReadUInt32BE()
};
}
// read the actual data for each strike table
for (int i = 0; i < count; i++)
{
// read the subtable header
reader.Seek(baseOffset + sizeTableHeaders[i].SubTableOffset + indexSubTables[i].Offset);
var indexFormat = reader.ReadUInt16BE();
var imageFormat = reader.ReadUInt16BE();
var imageDataOffset = reader.ReadUInt32BE();
}
return(null);
}
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
};
}