public static int ParseOperand(FontParser parser, int b0)
{
if (b0 == 28)
{
return(parser.ReadInt16());
}
if (b0 == 29)
{
return(parser.ReadInt32());
}
if (b0 == 30)
{
// A floating point value which we really don't need - skipping!
while (true)
{
byte b = parser.ReadByte();
int n1 = b >> 4;
int n2 = b & 15;
if (n1 == 15 || n2 == 15)
{
break;
}
}
return(0);
}
if (b0 >= 32 && b0 <= 246)
{
return(b0 - 139);
}
if (b0 >= 247 && b0 <= 250)
{
return((b0 - 247) * 256 + parser.ReadByte() + 108);
}
if (b0 >= 251 && b0 <= 254)
{
return(-(b0 - 251) * 256 - parser.ReadByte() - 108);
}
return(0);
}
public static int LoadGlyphCoordinate(FontParser parser, byte flag, int previousValue, int shortVectorBitMask, int sameBitMask)
{
int v;
if ((flag & shortVectorBitMask) > 0)
{
// The coordinate is 1 byte long.
v = parser.ReadByte();
// The "same" bit is re-used for short values to signify the sign of the value.
if ((flag & sameBitMask) == 0)
{
v = -v;
}
v = previousValue + v;
}
else
{
// The coordinate is 2 bytes long.
// If the same bit is set, the coordinate is the same as the previous coordinate.
if ((flag & sameBitMask) > 0)
{
v = previousValue;
}
else
{
// Parse the coordinate as a signed 16-bit delta value.
v = previousValue + parser.ReadInt16();
}
}
return(v);
}
public static Dictionary <int, List <int> > ParseCFFDict(FontParser parser, int length)
{
// Create the results set:
Dictionary <int, List <int> > results = new Dictionary <int, List <int> >();
// Our first values set:
List <int> values = new List <int>();
// Note that rather awkwardly the key comes *after* the set of values.
int max = parser.Position + length;
// While there's more data..
while (parser.Position < max)
{
// Read the state byte:
int state = parser.ReadByte();
if (state < 22)
{
if (state == 12)
{
// 2 byte key code.
state = 1200 + parser.ReadByte();
}
// Push values:
results[state] = values;
// Clear:
values = new List <int>();
}
else
{
// Read the operand:
int operand = ParseOperand(parser, state);
// Push:
values.Add(operand);
}
}
return(results);
}
private static Glyph[] LoadIndex(FontParser parser,CffGlyphParser cffParser){
// Read the index which contains a bunch of char strings.
// Each charstring is a postscript glyph definition.
// How many are in here?
int count=parser.ReadUInt16();
if(count==0){
return null;
}
// Create the offset set:
int[] offsets=new int[count+1];
// Read the offset size:
int offsetSize=parser.ReadByte();
// Read each offset:
for(int i=0;i<=count;i++){
// Read the current offset:
offsets[i]=parser.ReadOffset(offsetSize);
}
// Grab the object offset, minus one as their not zero based:
int objectOffset=parser.Position-1;
// Create the glyph set:
Glyph[] glyphs=new Glyph[offsets.Length-1];
// For each one..
for(int i=0;i<glyphs.Length;i++){
// Get the (relative) indices:
int startIndex=offsets[i];
int length=offsets[i+1]-startIndex;
// Load the glyph now, which starts at startIndex+objectOffset:
Glyph glyph=cffParser.LoadGlyph(startIndex+objectOffset,length);
// Add to the set:
glyphs[i]=glyph;
}
// Seek over the table:
parser.Position=objectOffset+offsets[count];
return glyphs;
}
private static Glyph[] LoadIndex(FontParser parser, CffGlyphParser cffParser)
{
// Read the index which contains a bunch of char strings.
// Each charstring is a postscript glyph definition.
// How many are in here?
int count = parser.ReadUInt16();
if (count == 0)
{
return(null);
}
// Create the offset set:
int[] offsets = new int[count + 1];
// Read the offset size:
int offsetSize = parser.ReadByte();
// Read each offset:
for (int i = 0; i <= count; i++)
{
// Read the current offset:
offsets[i] = parser.ReadOffset(offsetSize);
}
// Grab the object offset, minus one as their not zero based:
int objectOffset = parser.Position - 1;
// Create the glyph set:
Glyph[] glyphs = new Glyph[offsets.Length - 1];
// For each one..
for (int i = 0; i < glyphs.Length; i++)
{
// Get the (relative) indices:
int startIndex = offsets[i];
int length = offsets[i + 1] - startIndex;
// Load the glyph now, which starts at startIndex+objectOffset:
Glyph glyph = cffParser.LoadGlyph(startIndex + objectOffset, length);
// Add to the set:
glyphs[i] = glyph;
}
// Seek over the table:
parser.Position = objectOffset + offsets[count];
return(glyphs);
}
private static CffSubPosition[] LoadSubIndex(FontParser parser)
{
// How many are in here?
int count = parser.ReadUInt16();
if (count == 0)
{
return(null);
}
// Create the offset set:
int[] offsets = new int[count + 1];
// Read the offset size:
int offsetSize = parser.ReadByte();
// Read each offset:
for (int i = 0; i <= count; i++)
{
// Read the current offset:
offsets[i] = parser.ReadOffset(offsetSize);
}
// Minus one as their not zero based:
int objectOffset = parser.Position - 1;
// Seek over the table:
parser.Position = objectOffset + offsets[count];
// Create the result set:
CffSubPosition[] results = new CffSubPosition[offsets.Length - 1];
// For each one..
for (int i = 0; i < results.Length; i++)
{
// Get the (relative) indices:
int startIndex = offsets[i];
int length = offsets[i + 1] - startIndex;
// Load the glyph now, which starts at startIndex+objectOffset:
results[i] = new CffSubPosition(startIndex + objectOffset, length);
}
return(results);
}
private static Dictionary <int, List <int> > LoadDict(FontParser parser)
{
// How many are in here?
int count = parser.ReadUInt16();
if (count == 0)
{
return(null);
}
// Read the offset size:
int offsetSize = parser.ReadByte();
// Grab the position:
int position = parser.Position;
// Find where the data starts:
int objectOffset = position + ((count + 1) * offsetSize) - 1;
// Read two only:
int firstOffset = parser.ReadOffset(offsetSize);
int secondOffset = parser.ReadOffset(offsetSize);
// Seek to the location:
parser.Position = firstOffset + objectOffset;
// Parse the dictionary now:
Dictionary <int, List <int> > set = ParseCFFDict(parser, secondOffset - firstOffset);
// Return:
parser.Position = position;
// Skip the rest:
parser.Position += offsetSize * count;
// Read the last offset:
secondOffset = parser.ReadOffset(offsetSize);
// Seek there, minus one as their not zero based:
parser.Position += secondOffset - 1;
return(set);
}
private static void SkipIndex(FontParser parser)
{
// How many are in here?
int count = parser.ReadUInt16();
if (count > 0)
{
// Read the offset size:
int offsetSize = parser.ReadByte();
// Skip count offsets:
parser.Position += offsetSize * count;
// Read the last offset:
int lastOffset = parser.ReadOffset(offsetSize);
// Seek there, minus one as their not zero based:
parser.Position += lastOffset - 1;
}
}
private static void SkipIndex(FontParser parser){
// How many are in here?
int count=parser.ReadUInt16();
if(count>0){
// Read the offset size:
int offsetSize=parser.ReadByte();
// Skip count offsets:
parser.Position+=offsetSize*count;
// Read the last offset:
int lastOffset=parser.ReadOffset(offsetSize);
// Seek there, minus one as their not zero based:
parser.Position+=lastOffset-1;
}
}
private static void LoadGlyph(Glyph glyph, int contourCount, FontParser parser, float range)
{
// The contour count (tiny set):
ushort[] endPointIndices = new ushort[contourCount];
// Load each endpoint:
for (int i = 0; i < contourCount; i++)
{
endPointIndices[i] = parser.ReadUInt16();
}
// How big is the instruction block?
int instructionLength = parser.ReadUInt16();
// And skip it!
parser.Position += instructionLength;
// How many coordinates?
int numberOfCoordinates = endPointIndices[endPointIndices.Length - 1] + 1;
// Create the flag set:
byte[] flags = new byte[numberOfCoordinates];
// For each one..
for (int i = 0; i < numberOfCoordinates; i++)
{
byte flag = parser.ReadByte();
flags[i] = flag;
// If bit 3 is set, we repeat this flag n times, where n is the next byte.
if ((flag & 8) > 0)
{
int repeatCount = parser.ReadByte();
for (int j = 0; j < repeatCount; j += 1)
{
i++;
flags[i] = flag;
}
}
}
if (endPointIndices.Length > 0)
{
// X/Y coordinates are relative to the previous point, except for the first point which is relative to 0,0.
if (numberOfCoordinates > 0)
{
// Current coord:
int coord = 0;
// Coord index:
int coordIndex = 0;
// The coord set:
float[] coords = new float[numberOfCoordinates * 2];
// Load X coords:
for (int i = 0; i < numberOfCoordinates; i++)
{
byte flag = flags[i];
coord = LoadGlyphCoordinate(parser, flag, coord, 2, 16);
coords[coordIndex] = (float)coord / range;
coordIndex += 2;
}
// Reset shared vars:
coord = 0;
coordIndex = 1;
// Load Y coords:
for (int i = 0; i < numberOfCoordinates; i++)
{
byte flag = flags[i];
coord = LoadGlyphCoordinate(parser, flag, coord, 4, 32);
coords[coordIndex] = (float)coord / range;
coordIndex += 2;
}
int[] orderedEnds = new int[endPointIndices.Length];
int currentEnd = 0;
for (int i = 0; i < numberOfCoordinates; i++)
{
// Grab the flag:
byte flag = flags[i];
// On curve flag - Control point otherwise:
flag = (byte)(flag & 1);
// Last point of the current contour?
// For each end point index (tiny set - better than hash):
for (int e = endPointIndices.Length - 1; e >= 0; e--)
{
if (endPointIndices[e] == i)
{
orderedEnds[currentEnd] = i;
currentEnd++;
break;
}
}
// Update the flag - it's now just a 1 or 0:
flags[i] = flag;
}
// Reset shared index again:
coordIndex = 0;
// Create our temp holders of point info:
GlyphPoint firstPointRaw = new GlyphPoint(flags, coords);
GlyphPoint lastPointRaw = new GlyphPoint(flags, coords);
GlyphPoint prevPointRaw = new GlyphPoint(flags, coords);
GlyphPoint currentPointRaw = new GlyphPoint(flags, coords);
GlyphPoint controlPoint = new GlyphPoint(flags, coords);
// For each contour..
for (int i = 0; i < contourCount; i++)
{
int pointOffset = 0;
// Get the indices of the first/last points on this contour.
int firstIndex = 0;
int lastIndex = orderedEnds[i];
if (i != 0)
{
firstIndex = orderedEnds[i - 1] + 1;
}
GlyphPoint firstPoint = firstPointRaw;
firstPoint.Set(firstIndex);
GlyphPoint lastPoint = lastPointRaw;
lastPoint.Set(lastIndex);
if (firstPoint.OnCurve)
{
// No control point:
controlPoint.Active = false;
// The first point will be consumed by the moveTo command so skip it:
pointOffset = 1;
}
else
{
if (lastPoint.OnCurve)
{
// If the first point is off-curve and the last point is on-curve,
// start at the last point.
firstPoint = lastPoint;
}
else
{
// If both first and last points are off-curve, start at their middle.
firstPoint.X = (firstPoint.X + lastPoint.X) / 2f;
firstPoint.Y = (firstPoint.Y + lastPoint.Y) / 2f;
}
controlPoint.Set(firstPoint);
}
glyph.MoveTo(firstPoint.X, firstPoint.Y);
int contourStart = firstIndex + pointOffset;
for (int j = contourStart; j <= lastIndex; j++)
{
// Setup the previous point:
GlyphPoint prevPoint;
if (j == firstIndex)
{
prevPoint = firstPoint;
}
else
{
prevPoint = prevPointRaw;
prevPoint.Set(j - 1);
}
// Setup the current point:
GlyphPoint pt = currentPointRaw;
pt.Set(j);
if (prevPoint.OnCurve && pt.OnCurve)
{
// Just a line here:
glyph.LineTo(pt.X, pt.Y);
}
else if (prevPoint.OnCurve && !pt.OnCurve)
{
controlPoint.Set(pt);
}
else if (!prevPoint.OnCurve && !pt.OnCurve)
{
float midPointX = (prevPoint.X + pt.X) / 2f;
float midPointY = (prevPoint.Y + pt.Y) / 2f;
glyph.QuadraticCurveTo(prevPoint.X, prevPoint.Y, midPointX, midPointY);
controlPoint.Set(pt);
}
else if (!prevPoint.OnCurve && pt.OnCurve)
{
// Previous point off-curve, this point on-curve.
glyph.QuadraticCurveTo(controlPoint.X, controlPoint.Y, pt.X, pt.Y);
controlPoint.Active = false;
}
}
if (firstPoint != lastPoint)
{
// Close the path.
if (controlPoint.Active)
{
// Still got a spare control point:
glyph.QuadraticCurveTo(controlPoint.X, controlPoint.Y, firstPoint.X, firstPoint.Y);
}
// Just a normal close:
glyph.ClosePath();
}
}
}
}
if (glyph.Font.WindingUnknown)
{
// Find the winding now:
glyph.Font.FindWinding(glyph);
}
}
private static CffSubPosition[] LoadSubIndex(FontParser parser){
// How many are in here?
int count=parser.ReadUInt16();
if(count==0){
return null;
}
// Create the offset set:
int[] offsets=new int[count+1];
// Read the offset size:
int offsetSize=parser.ReadByte();
// Read each offset:
for(int i=0;i<=count;i++){
// Read the current offset:
offsets[i]=parser.ReadOffset(offsetSize);
}
// Minus one as their not zero based:
int objectOffset=parser.Position-1;
// Seek over the table:
parser.Position=objectOffset+offsets[count];
// Create the result set:
CffSubPosition[] results=new CffSubPosition[offsets.Length-1];
// For each one..
for(int i=0;i<results.Length;i++){
// Get the (relative) indices:
int startIndex=offsets[i];
int length=offsets[i+1]-startIndex;
// Load the glyph now, which starts at startIndex+objectOffset:
results[i]=new CffSubPosition(startIndex+objectOffset,length);
}
return results;
}
private void Parse(int start, int codeLength)
{
// Seek there now:
Parser.Position = start;
// Where should the parser quit?
int max = start + codeLength;
float c1x;
float c1y;
float c2x;
float c2y;
int subIndex;
CffSubPosition subCode;
// For each bytecode..
while (Parser.Position < max)
{
// Grab the byte:
byte v = Parser.ReadByte();
switch (v)
{
case 1: // hstem
ParseStems();
break;
case 3: // vstem
ParseStems();
break;
case 4: // vmoveto
if (Stack.Length > 1 && !HasWidth)
{
Width = Stack.Shift() + NominalWidthX;
HasWidth = true;
}
Y += Stack.Shift();
Glyph.ClosePath();
// Move:
Glyph.MoveTo(X * ScaleRatio, Y * ScaleRatio);
break;
case 5: // rlineto
while (Stack.Length > 0)
{
X += Stack.Shift();
Y += Stack.Shift();
Glyph.LineTo(X * ScaleRatio, Y * ScaleRatio);
}
break;
case 6: // hlineto
while (Stack.Length > 0)
{
X += Stack.Shift();
Glyph.LineTo(X * ScaleRatio, Y * ScaleRatio);
if (Stack.Empty)
{
break;
}
Y += Stack.Shift();
Glyph.LineTo(X * ScaleRatio, Y * ScaleRatio);
}
break;
case 7: // vlineto
while (Stack.Length > 0)
{
Y += Stack.Shift();
Glyph.LineTo(X * ScaleRatio, Y * ScaleRatio);
if (Stack.Length == 0)
{
break;
}
X += Stack.Shift();
Glyph.LineTo(X * ScaleRatio, Y * ScaleRatio);
}
break;
case 8: // rrcurveto
while (Stack.Length > 0)
{
c1x = X + Stack.Shift();
c1y = Y + Stack.Shift();
c2x = c1x + Stack.Shift();
c2y = c1y + Stack.Shift();
X = c2x + Stack.Shift();
Y = c2y + Stack.Shift();
Glyph.CurveTo(c1x * ScaleRatio, c1y * ScaleRatio, c2x * ScaleRatio, c2y * ScaleRatio, X * ScaleRatio, Y * ScaleRatio);
}
break;
case 10: // callsubr
subIndex = (int)Stack.Pop() + SubrsBias;
subCode = Subrs[subIndex];
if (subCode != null)
{
// Cache the position:
subIndex = Parser.Position;
// Parse:
Parse(subCode.Position, subCode.Length);
// Re-apply:
Parser.Position = subIndex;
}
break;
case 11: // return
return;
case 12: // escape
v = Parser.ReadByte();
break;
case 14: // endchar
if (Stack.Length > 0 && !HasWidth)
{
Width = Stack.Shift() + NominalWidthX;
HasWidth = true;
}
// Close the glyph:
Glyph.ClosePath();
break;
case 18: // hstemhm
ParseStems();
break;
case 19: // hintmask
case 20: // cntrmask
ParseStems();
Parser.Position += (NStems + 7) >> 3;
break;
case 21: // rmoveto
if (Stack.Length > 2 && !HasWidth)
{
Width = Stack.Shift() + NominalWidthX;
HasWidth = true;
}
X += Stack.Shift();
Y += Stack.Shift();
Glyph.ClosePath();
// Move now:
Glyph.MoveTo(X * ScaleRatio, Y * ScaleRatio);
break;
case 22: // hmoveto
if (Stack.Length > 1 && !HasWidth)
{
Width = Stack.Shift() + NominalWidthX;
HasWidth = true;
}
X += Stack.Shift();
Glyph.ClosePath();
// Move now:
Glyph.MoveTo(X * ScaleRatio, Y * ScaleRatio);
break;
case 23: // vstemhm
ParseStems();
break;
case 24: // rcurveline
while (Stack.Length > 2)
{
c1x = X + Stack.Shift();
c1y = Y + Stack.Shift();
c2x = c1x + Stack.Shift();
c2y = c1y + Stack.Shift();
X = c2x + Stack.Shift();
Y = c2y + Stack.Shift();
Glyph.CurveTo(c1x * ScaleRatio, c1y * ScaleRatio, c2x * ScaleRatio, c2y * ScaleRatio, X * ScaleRatio, Y * ScaleRatio);
}
X += Stack.Shift();
Y += Stack.Shift();
Glyph.LineTo(X * ScaleRatio, Y * ScaleRatio);
break;
case 25: // rlinecurve
while (Stack.Length > 6)
{
X += Stack.Shift();
Y += Stack.Shift();
Glyph.LineTo(X * ScaleRatio, Y * ScaleRatio);
}
c1x = X + Stack.Shift();
c1y = Y + Stack.Shift();
c2x = c1x + Stack.Shift();
c2y = c1y + Stack.Shift();
X = c2x + Stack.Shift();
Y = c2y + Stack.Shift();
Glyph.CurveTo(c1x * ScaleRatio, c1y * ScaleRatio, c2x * ScaleRatio, c2y * ScaleRatio, X * ScaleRatio, Y * ScaleRatio);
break;
case 26: // vvcurveto
if (Stack.IsOdd)
{
X += Stack.Shift();
}
while (Stack.Length > 0)
{
c1x = X;
c1y = Y + Stack.Shift();
c2x = c1x + Stack.Shift();
c2y = c1y + Stack.Shift();
X = c2x;
Y = c2y + Stack.Shift();
Glyph.CurveTo(c1x * ScaleRatio, c1y * ScaleRatio, c2x * ScaleRatio, c2y * ScaleRatio, X * ScaleRatio, Y * ScaleRatio);
}
break;
case 27: // hhcurveto
if (Stack.IsOdd)
{
Y += Stack.Shift();
}
while (Stack.Length > 0)
{
c1x = X + Stack.Shift();
c1y = Y;
c2x = c1x + Stack.Shift();
c2y = c1y + Stack.Shift();
X = c2x + Stack.Shift();
Y = c2y;
Glyph.CurveTo(c1x * ScaleRatio, c1y * ScaleRatio, c2x * ScaleRatio, c2y * ScaleRatio, X * ScaleRatio, Y * ScaleRatio);
}
break;
case 28: // shortint
Stack.Push(Parser.ReadInt16());
break;
case 29: // callgsubr
subIndex = (int)Stack.Pop() + GsubrsBias;
subCode = GSubrs[subIndex];
if (subCode != null)
{
// Cache the position:
subIndex = Parser.Position;
// Parse:
Parse(subCode.Position, subCode.Length);
// Re-apply:
Parser.Position = subIndex;
}
break;
case 30: // vhcurveto
while (Stack.Length > 0)
{
c1x = X;
c1y = Y + Stack.Shift();
c2x = c1x + Stack.Shift();
c2y = c1y + Stack.Shift();
X = c2x + Stack.Shift();
Y = c2y + (Stack.Length == 1?Stack.Shift():0);
Glyph.CurveTo(c1x * ScaleRatio, c1y * ScaleRatio, c2x * ScaleRatio, c2y * ScaleRatio, X * ScaleRatio, Y * ScaleRatio);
if (Stack.Empty)
{
break;
}
c1x = X + Stack.Shift();
c1y = Y;
c2x = c1x + Stack.Shift();
c2y = c1y + Stack.Shift();
Y = c2y + Stack.Shift();
X = c2x + (Stack.Length == 1?Stack.Shift():0);
Glyph.CurveTo(c1x * ScaleRatio, c1y * ScaleRatio, c2x * ScaleRatio, c2y * ScaleRatio, X * ScaleRatio, Y * ScaleRatio);
}
break;
case 31: // hvcurveto
while (Stack.Length > 0)
{
c1x = X + Stack.Shift();
c1y = Y;
c2x = c1x + Stack.Shift();
c2y = c1y + Stack.Shift();
Y = c2y + Stack.Shift();
X = c2x + (Stack.Length == 1 ? Stack.Shift() : 0);
Glyph.CurveTo(c1x * ScaleRatio, c1y * ScaleRatio, c2x * ScaleRatio, c2y * ScaleRatio, X * ScaleRatio, Y * ScaleRatio);
if (Stack.Empty)
{
break;
}
c1x = X;
c1y = Y + Stack.Shift();
c2x = c1x + Stack.Shift();
c2y = c1y + Stack.Shift();
X = c2x + Stack.Shift();
Y = c2y + (Stack.Length == 1?Stack.Shift():0);
Glyph.CurveTo(c1x * ScaleRatio, c1y * ScaleRatio, c2x * ScaleRatio, c2y * ScaleRatio, X * ScaleRatio, Y * ScaleRatio);
}
break;
default:
if (v < 32)
{
// Faulty operator.
return;
}
else if (v < 247)
{
Stack.Push(v - 139);
}
else if (v < 251)
{
Stack.Push((v - 247) * 256 + Parser.ReadByte() + 108);
}
else if (v < 255)
{
Stack.Push(-(v - 251) * 256 - Parser.ReadByte() - 108);
}
else
{
Stack.Push((float)Parser.ReadInt32() / 65536f);
}
break;
}
}
}
public static Dictionary<int,List<int>> ParseCFFDict(FontParser parser,int length){
// Create the results set:
Dictionary<int,List<int>> results=new Dictionary<int,List<int>>();
// Our first values set:
List<int> values=new List<int>();
// Note that rather awkwardly the key comes *after* the set of values.
int max=parser.Position+length;
// While there's more data..
while(parser.Position<max){
// Read the state byte:
int state=parser.ReadByte();
if(state<22){
if(state==12){
// 2 byte key code.
state=1200+parser.ReadByte();
}
// Push values:
results[state]=values;
// Clear:
values=new List<int>();
}else{
// Read the operand:
int operand=ParseOperand(parser,state);
// Push:
values.Add(operand);
}
}
return results;
}
public static bool Load(int version, FontParser parser, FontFace font)
{
// Load the V1/V2 header:
ushort numTables;
LoadHeader(version, parser, out numTables);
if (version == 1)
{
MemoryStream ms = new MemoryStream(parser.Data);
// Get the ZLIB compression helper:
Compressor zLib = Compression.Get("zlib");
// Read each table next.
for (int i = 0; i < numTables; i++)
{
string tag = parser.ReadTag();
uint offset = parser.ReadUInt32();
uint compLength = parser.ReadUInt32();
uint origLength = parser.ReadUInt32();
parser.ReadUInt32(); // origChecksum
// Cache position:
int pos = parser.Position;
if (compLength != origLength)
{
// Decompress the table now (zlib)
// Seek to table:
ms.Position = (int)offset;
// Decompressed data:
byte[] decompressedTable = new byte[(int)origLength];
// Decompress now into our target bytes:
zLib.Decompress(ms, decompressedTable);
}
else
{
// Ordinary table.
parser.HandleTable(tag, (int)offset, font);
}
// Restore position:
parser.Position = pos;
}
}
else if (version == 2)
{
// Read each table entry next. The data here is compressed as one single block after the table meta.
Woff2Table[] tableHeaders = new Woff2Table[numTables];
int offset = 0;
for (int i = 0; i < numTables; i++)
{
// Read the table entry:
byte flags = parser.ReadByte();
string tag;
int tagFlag = (flags & 63);
if (tagFlag == 63)
{
tag = parser.ReadTag();
}
else
{
tag = TagLookup[tagFlag];
}
ulong origLength = parser.ReadBase128();
ulong transformLength = 0;
int transformVersion = (flags >> 6); //0-3
if (tag == "glyf" || tag == "loca")
{
// transform length:
transformLength = parser.ReadBase128();
}
offset += (int)origLength;
tableHeaders[i] = new Woff2Table(tag, offset, (int)transformLength, transformVersion);
}
}
// All ok:
return(true);
}
public static bool Load(FontParser parser, int start, FontFace font, Glyph[] glyphs)
{
// Seek there:
parser.Position = start;
// Read the version (and check if it's zero):
if (parser.ReadUInt16() != 0)
{
return(false);
}
// Strangely the cmap table can have lots of tables inside it. For now we're looking for the common type 3 table.
// Number of tables:
int tableCount = parser.ReadUInt16();
// Total characters in font:
int characterCount = 0;
int offset = -1;
int favour = 0;
for (int i = 0; i < tableCount; i += 1)
{
// Grab the platform ID:
int platformId = parser.ReadUInt16();
// And the encoding ID:
int encodingId = parser.ReadUInt16();
if (platformId == 3 || platformId == 0)
{
if (encodingId == 10)
{
// Top favourite - most broad Unicode encoding.
// Read offset:
offset = (int)parser.ReadUInt32();
break;
}
else if (encodingId == 1 || encodingId == 0)
{
// Read offset:
offset = (int)parser.ReadUInt32();
// Mid-range favourite:
favour = 1;
continue;
}
else if (favour == 0)
{
// Anything else we'll give a try:
// Read offset (but don't break):
offset = (int)parser.ReadUInt32();
continue;
}
}
// Skip offset:
parser.Position += 4;
}
if (offset == -1)
{
// We don't support this font :(
return(false);
}
// Seek to the cmap now:
parser.Position = start + offset;
// Check it's format 4:
int format = parser.ReadUInt16();
if (format > 6)
{
// We now have e.g. 12.0 - another short here:
parser.Position += 2;
// Size/ structure are both 4 byte ints now:
parser.Position += 8;
}
else
{
// Size of the sub-table (map length, u16):
parser.Position += 2;
// Structure of the sub-table (map language, u16):
parser.Position += 2;
}
switch (format)
{
case 0:
// Byte encoding table:
for (int i = 0; i < 256; i++)
{
int rByte = parser.ReadByte();
Glyph glyph = glyphs[rByte];
if (glyph != null)
{
characterCount++;
glyph.AddCharcode(i);
}
}
break;
case 2:
// The offset to the headers:
int subOffset = parser.Position + (256 * 2);
// For each high byte:
for (int i = 0; i < 256; i++)
{
// Read the index to the header and zero out the bottom 3 bits:
int headerPosition = subOffset + (parser.ReadUInt16() & (~7));
// Read the header:
int firstCode = parser.ReadUInt16(ref headerPosition);
int entryCount = parser.ReadUInt16(ref headerPosition);
short idDelta = parser.ReadInt16(ref headerPosition);
// Grab the current position:
int pos = headerPosition;
// Read the idRangeOffset - the last part of the header:
pos += parser.ReadUInt16(ref headerPosition);
int maxCode = firstCode + entryCount;
// Get the high byte value:
int highByte = (i << 8);
// For each low byte:
for (int j = firstCode; j < maxCode; j++)
{
// Get the full charcode (which might not actually exist yet):
int charCode = highByte + j;
// Read the base of the glyphIndex:
int p = parser.ReadUInt16(ref pos);
if (p == 0)
{
continue;
}
p = (p + idDelta) & 0xFFFF;
if (p == 0)
{
continue;
}
Glyph glyph = glyphs[p];
if (glyph != null)
{
characterCount++;
glyph.AddCharcode(charCode);
}
}
}
break;
case 4:
// Segment count. It's doubled.
int segCount = (parser.ReadUInt16() >> 1);
// Search range, entry selector and range shift (don't need any):
parser.Position += 6;
int baseIndex = parser.Position;
int endCountIndex = baseIndex;
baseIndex += 2;
int startCountIndex = baseIndex + segCount * 2;
int idDeltaIndex = baseIndex + segCount * 4;
int idRangeOffsetIndex = baseIndex + segCount * 6;
for (int i = 0; i < segCount - 1; i++)
{
int endCount = parser.ReadUInt16(ref endCountIndex);
int startCount = parser.ReadUInt16(ref startCountIndex);
int idDelta = parser.ReadInt16(ref idDeltaIndex);
int idRangeOffset = parser.ReadUInt16(ref idRangeOffsetIndex);
for (int c = startCount; c <= endCount; c++)
{
int glyphIndex;
if (idRangeOffset != 0)
{
// The idRangeOffset is relative to the current position in the idRangeOffset array.
// Take the current offset in the idRangeOffset array.
int glyphIndexOffset = (idRangeOffsetIndex - 2);
// Add the value of the idRangeOffset, which will move us into the glyphIndex array.
glyphIndexOffset += idRangeOffset;
// Then add the character index of the current segment, multiplied by 2 for USHORTs.
glyphIndexOffset += (c - startCount) * 2;
glyphIndex = parser.ReadUInt16(ref glyphIndexOffset);
if (glyphIndex != 0)
{
glyphIndex = (glyphIndex + idDelta) & 0xFFFF;
}
}
else
{
glyphIndex = (c + idDelta) & 0xFFFF;
}
// Add a charcode to the glyph now:
Glyph glyph = glyphs[glyphIndex];
if (glyph != null)
{
characterCount++;
glyph.AddCharcode(c);
}
}
}
break;
case 6:
int firstCCode = parser.ReadUInt16();
int entryCCount = parser.ReadUInt16();
for (int i = 0; i < entryCCount; i++)
{
Glyph glyphC = glyphs[parser.ReadUInt16()];
if (glyphC != null)
{
characterCount++;
glyphC.AddCharcode(firstCCode + i);
}
}
break;
case 12:
int groups = (int)parser.ReadUInt32();
for (int i = 0; i < groups; i++)
{
int startCode = (int)parser.ReadUInt32();
int endCode = (int)parser.ReadUInt32();
int startGlyph = (int)parser.ReadUInt32();
int count = (endCode - startCode);
for (int j = 0; j <= count; j++)
{
int glyphIndex = (startGlyph + j);
Glyph glyph = glyphs[glyphIndex];
if (glyph != null)
{
characterCount++;
glyph.AddCharcode(startCode + j);
}
}
}
break;
default:
Fonts.OnLogMessage("InfiniText does not currently support this font. If you need it, please contact us with this: Format: " + format);
break;
}
font.CharacterCount = characterCount;
return(true);
}
public static int ParseOperand(FontParser parser,int b0){
if(b0==28){
return parser.ReadInt16();
}
if(b0==29){
return parser.ReadInt32();
}
if(b0==30){
// A floating point value which we really don't need - skipping!
while(true){
byte b=parser.ReadByte();
int n1 = b >> 4;
int n2 = b & 15;
if (n1 ==15 || n2==15) {
break;
}
}
return 0;
}
if (b0 >= 32 && b0 <= 246) {
return b0 - 139;
}
if (b0 >= 247 && b0 <= 250) {
return (b0 - 247) * 256 + parser.ReadByte() + 108;
}
if (b0 >= 251 && b0 <= 254) {
return -(b0 - 251) * 256 - parser.ReadByte() - 108;
}
return 0;
}
private static int LoadSubTable(FontParser parser, int start, FontFace font, Glyph[] glyphs)
{
// Total characters in subtable:
int characterCount = 0;
// Seek to the cmap now:
parser.Position = start;
// Check it's format 4:
int format = parser.ReadUInt16();
#if INFINITEXT_DEBUG
Fonts.OnLogMessage("Cmap subtable format: " + format);
#endif
if (format > 13)
{
// We now have e.g. 14.0 - ulong here ("Length"):
parser.Position += 4;
}
else if (format > 6)
{
// We now have e.g. 12.0 - another short here (reserved):
parser.Position += 2;
// Length and language are both 4 byte ints now:
parser.Position += 8;
}
else
{
// Size of the sub-table (map length, u16):
parser.Position += 2;
// Structure of the sub-table (map language, u16):
parser.Position += 2;
}
switch (format)
{
case 0:
// Byte encoding table:
for (int i = 0; i < 256; i++)
{
int rByte = parser.ReadByte();
Glyph glyph = glyphs[rByte];
if (glyph != null)
{
characterCount++;
glyph.AddCharcode(i);
}
}
break;
case 2:
// The offset to the headers:
int subOffset = parser.Position + (256 * 2);
// For each high byte:
for (int i = 0; i < 256; i++)
{
// Read the index to the header and zero out the bottom 3 bits:
int headerPosition = subOffset + (parser.ReadUInt16() & (~7));
// Read the header:
int firstCode = parser.ReadUInt16(ref headerPosition);
int entryCount = parser.ReadUInt16(ref headerPosition);
short idDelta = parser.ReadInt16(ref headerPosition);
// Grab the current position:
int pos = headerPosition;
// Read the idRangeOffset - the last part of the header:
pos += parser.ReadUInt16(ref headerPosition);
int maxCode = firstCode + entryCount;
// Get the high byte value:
int highByte = (i << 8);
// For each low byte:
for (int j = firstCode; j < maxCode; j++)
{
// Get the full charcode (which might not actually exist yet):
int charCode = highByte + j;
// Read the base of the glyphIndex:
int p = parser.ReadUInt16(ref pos);
if (p == 0)
{
continue;
}
p = (p + idDelta) & 0xFFFF;
if (p == 0)
{
continue;
}
Glyph glyph = glyphs[p];
if (glyph != null)
{
characterCount++;
glyph.AddCharcode(charCode);
}
}
}
break;
case 4:
// Segment count. It's doubled.
int segCount = (parser.ReadUInt16() >> 1);
// Search range, entry selector and range shift (don't need any):
parser.Position += 6;
int baseIndex = parser.Position;
int endCountIndex = baseIndex;
baseIndex += 2;
int startCountIndex = baseIndex + segCount * 2;
int idDeltaIndex = baseIndex + segCount * 4;
int idRangeOffsetIndex = baseIndex + segCount * 6;
for (int i = 0; i < segCount - 1; i++)
{
int endCount = parser.ReadUInt16(ref endCountIndex);
int startCount = parser.ReadUInt16(ref startCountIndex);
int idDelta = parser.ReadInt16(ref idDeltaIndex);
int idRangeOffset = parser.ReadUInt16(ref idRangeOffsetIndex);
for (int c = startCount; c <= endCount; c++)
{
int glyphIndex;
if (idRangeOffset != 0)
{
// The idRangeOffset is relative to the current position in the idRangeOffset array.
// Take the current offset in the idRangeOffset array.
int glyphIndexOffset = (idRangeOffsetIndex - 2);
// Add the value of the idRangeOffset, which will move us into the glyphIndex array.
glyphIndexOffset += idRangeOffset;
// Then add the character index of the current segment, multiplied by 2 for USHORTs.
glyphIndexOffset += (c - startCount) * 2;
glyphIndex = parser.ReadUInt16(ref glyphIndexOffset);
if (glyphIndex != 0)
{
glyphIndex = (glyphIndex + idDelta) & 0xFFFF;
}
}
else
{
glyphIndex = (c + idDelta) & 0xFFFF;
}
// Add a charcode to the glyph now:
Glyph glyph = glyphs[glyphIndex];
if (glyph != null)
{
characterCount++;
glyph.AddCharcode(c);
}
}
}
break;
case 6:
int firstCCode = parser.ReadUInt16();
int entryCCount = parser.ReadUInt16();
for (int i = 0; i < entryCCount; i++)
{
Glyph glyphC = glyphs[parser.ReadUInt16()];
if (glyphC != null)
{
characterCount++;
glyphC.AddCharcode(firstCCode + i);
}
}
break;
case 10:
// Trimmed array. Similar to format 6.
int startCharCode = parser.ReadUInt16();
int numChars = parser.ReadUInt16();
for (int i = 0; i < numChars; i++)
{
Glyph glyphC = glyphs[parser.ReadUInt16()];
if (glyphC != null)
{
characterCount++;
glyphC.AddCharcode(startCharCode + i);
}
}
break;
case 12:
// Segmented coverage.
// Mapping of 1 charcode to 1 glyph. "Segmented" because it can come in blocks called groups.
int groups = (int)parser.ReadUInt32();
// For each group of glyphs..
for (int i = 0; i < groups; i++)
{
// Start/end charcode:
int startCode = (int)parser.ReadUInt32();
int endCode = (int)parser.ReadUInt32();
// Start glyph ID:
int startGlyph = (int)parser.ReadUInt32();
int count = (endCode - startCode);
// For each glyph/charcode pair..
for (int j = 0; j <= count; j++)
{
// Get the glyph:
int glyphIndex = (startGlyph + j);
Glyph glyph = glyphs[glyphIndex];
if (glyph != null)
{
characterCount++;
// Charcode is..
glyph.AddCharcode(startCode + j);
}
}
}
break;
case 13:
// Many to one. Same format as #12 but the meaning is a bit different.
// How many groups?
int glyphCount = (int)parser.ReadUInt32();
for (int i = 0; i < glyphCount; i++)
{
int startCode = (int)parser.ReadUInt32();
int endCode = (int)parser.ReadUInt32();
int glyphID = (int)parser.ReadUInt32();
// Get the glyph:
Glyph glyph = glyphs[glyphID];
if (glyph != null)
{
int count = (endCode - startCode);
// For each charcode..
for (int j = 0; j <= count; j++)
{
characterCount++;
// Hook up glyph to this charcode:
glyph.AddCharcode(startCode + j);
}
}
}
break;
case 14:
Fonts.OnLogMessage("InfiniText partially supports part of the font '" + font.Family.Name + "' - this is harmless. Search for this message for more.");
// This font contains a format 14 CMAP Table.
// Format 14 is "Unicode variation selectors" - essentially different versions of the same character.
// E.g. a text Emoji character and a graphical one.
// In a text system like InfiniText, that just means we must map a bunch of different charcodes
// to the same glyph.
// .. I Think! As usual, the OpenType spec doesn't make too much sense.
// However, it appears to be entirely optional.
// So, approx implementation is below, however getting the utf32 code point from the variation + base character
// is completely undocumented - my best guess unfortunately threw errors.
// See the commented out block below!
break;
/*
*
* case 14:
*
* // How many var selector records?
* int records=(int)parser.ReadUInt32();
*
* for(int i=0;i<records;i++){
*
* // variation selector:
* int varSelector=(int)parser.ReadUInt24();
*
* // Offsets:
* int defaultUVSOffset=(int)parser.ReadUInt32();
* int nonDefaultUVSOffset=(int)parser.ReadUInt32();
*
* // Grab parser position:
* int position=parser.Position;
*
* // Got a ref to a default style table?
* if(defaultUVSOffset!=0){
*
* // Yep! The UVS is simply a list of "base" characters, each with ranges of available charcodes.
* // [BaseCharCode][The extended part. Each of these comes from the range.]
* // The actual glyph is the one that we get by directly looking up each of the base characters.
*
* // Seek to the table:
* parser.Position=start+defaultUVSOffset;
*
* // Read the unicode value ranges count:
* int numUniRangesCount=(int)parser.ReadUInt32();
*
* // For each one..
* for(int m=0;m<numUniRangesCount;m++){
*
* // Read the base charcode:
* int baseCharcode=(int)parser.ReadUInt24();
*
* // Read the size of the range:
* byte rangeSize=parser.ReadByte();
*
* for(int c=0;c<=rangeSize;c++){
*
* // Fetch the base glyph:
* Glyph glyph=font.GetGlyphDirect(baseCharcode);
*
* if(glyph!=null){
*
* // Combine baseCharcode with varSelector next to form the variation (of "glyph").
*
* // Get the full charcode (this is incorrect!):
* // int charcode=char.ConvertToUtf32((char)baseCharcode,(char)varSelector);
*
* // Add:
* //glyph.AddCharcode(charcode);
*
* }
*
* // Move baseCharcode along:
* baseCharcode++;
*
* }
*
* }
*
* // Restore parser:
* parser.Position=position;
*
* }
*
* // Got a ref to a non-default style table?
* if(nonDefaultUVSOffset!=0){
*
* // Yep! The UVS is simply a list of "base" characters, each with ranges of available charcodes.
* // [BaseCharCode][The extended part. Each of these comes from the range.]
* // This time though, the glyph to use is directly specified
* // (that's what gives it the "non-default" property).
*
* // Seek to the table:
* parser.Position=start+nonDefaultUVSOffset;
*
* // Read the number of mappings:
* int numMappings=(int)parser.ReadUInt32();
*
* // For each one..
* for(int m=0;m<numMappings;m++){
*
* // Read the base charcode:
* int baseCharcode=(int)parser.ReadUInt24();
*
* // Read glyph ID:
* int glyphID=(int)parser.ReadUInt16();
*
* // Get the glyph:
* Glyph glyph=glyphs[glyphID];
*
* if(glyph!=null){
*
* // Combine baseCharcode with varSelector next to form the variation (of "glyph").
*
* // Get the full charcode (this is incorrect!):
* // int charcode=char.ConvertToUtf32((char)baseCharcode,(char)varSelector);
*
* // Add:
* //glyph.AddCharcode(charcode);
*
* }
*
* }
*
* // Restore parser:
* parser.Position=position;
*
* }
*
* }
*
* break;
*
*/
default:
Fonts.OnLogMessage("InfiniText does not currently support part of this font. If you need it, please contact us with this: Format: " + format);
break;
}
return(characterCount);
}
private static void LoadGlyph(Glyph glyph,int contourCount,FontParser parser,float range){
// The contour count (tiny set):
ushort[] endPointIndices=new ushort[contourCount];
// Load each endpoint:
for(int i=0;i<contourCount;i++){
endPointIndices[i]=parser.ReadUInt16();
}
// How big is the instruction block?
int instructionLength=parser.ReadUInt16();
// And skip it!
parser.Position+=instructionLength;
// How many coordinates?
int numberOfCoordinates=endPointIndices[endPointIndices.Length-1]+1;
// Create the flag set:
byte[] flags=new byte[numberOfCoordinates];
// For each one..
for (int i = 0; i < numberOfCoordinates;i++) {
byte flag=parser.ReadByte();
flags[i]=flag;
// If bit 3 is set, we repeat this flag n times, where n is the next byte.
if((flag&8)>0){
int repeatCount = parser.ReadByte();
for (int j = 0; j < repeatCount; j += 1) {
i++;
flags[i]=flag;
}
}
}
if (endPointIndices.Length > 0) {
// X/Y coordinates are relative to the previous point, except for the first point which is relative to 0,0.
if (numberOfCoordinates > 0){
// Current coord:
int coord=0;
// Coord index:
int coordIndex=0;
// The coord set:
float[] coords=new float[numberOfCoordinates*2];
// Load X coords:
for (int i = 0; i < numberOfCoordinates; i++) {
byte flag = flags[i];
coord = LoadGlyphCoordinate(parser,flag,coord,2,16);
coords[coordIndex]=(float)coord/range;
coordIndex+=2;
}
// Reset shared vars:
coord=0;
coordIndex=1;
// Load Y coords:
for (int i = 0; i < numberOfCoordinates; i++) {
byte flag = flags[i];
coord = LoadGlyphCoordinate(parser,flag,coord,4,32);
coords[coordIndex]=(float)coord/range;
coordIndex+=2;
}
int[] orderedEnds=new int[endPointIndices.Length];
int currentEnd=0;
for (int i = 0; i < numberOfCoordinates; i++) {
// Grab the flag:
byte flag=flags[i];
// On curve flag - Control point otherwise:
flag=(byte)(flag&1);
// Last point of the current contour?
// For each end point index (tiny set - better than hash):
for(int e=endPointIndices.Length-1;e>=0;e--){
if(endPointIndices[e]==i){
orderedEnds[currentEnd]=i;
currentEnd++;
break;
}
}
// Update the flag - it's now just a 1 or 0:
flags[i]=flag;
}
// Reset shared index again:
coordIndex=0;
// Create our temp holders of point info:
GlyphPoint firstPointRaw=new GlyphPoint(flags,coords);
GlyphPoint lastPointRaw=new GlyphPoint(flags,coords);
GlyphPoint prevPointRaw=new GlyphPoint(flags,coords);
GlyphPoint currentPointRaw=new GlyphPoint(flags,coords);
GlyphPoint controlPoint=new GlyphPoint(flags,coords);
// For each contour..
for(int i=0;i<contourCount;i++){
int pointOffset=0;
// Get the indices of the first/last points on this contour.
int firstIndex=0;
int lastIndex=orderedEnds[i];
if(i!=0){
firstIndex=orderedEnds[i-1]+1;
}
GlyphPoint firstPoint=firstPointRaw;
firstPoint.Set(firstIndex);
GlyphPoint lastPoint=lastPointRaw;
lastPoint.Set(lastIndex);
if(firstPoint.OnCurve){
// No control point:
controlPoint.Active=false;
// The first point will be consumed by the moveTo command so skip it:
pointOffset=1;
}else{
if(lastPoint.OnCurve){
// If the first point is off-curve and the last point is on-curve,
// start at the last point.
firstPoint=lastPoint;
}else{
// If both first and last points are off-curve, start at their middle.
firstPoint.X=(firstPoint.X+lastPoint.X)/2f;
firstPoint.Y=(firstPoint.Y+lastPoint.Y)/2f;
}
controlPoint.Set(firstPoint);
}
glyph.MoveTo(firstPoint.X,firstPoint.Y);
int contourStart=firstIndex+pointOffset;
for(int j=contourStart;j<=lastIndex;j++){
// Setup the previous point:
GlyphPoint prevPoint;
if(j==firstIndex){
prevPoint=firstPoint;
}else{
prevPoint=prevPointRaw;
prevPoint.Set(j-1);
}
// Setup the current point:
GlyphPoint pt=currentPointRaw;
pt.Set(j);
if(prevPoint.OnCurve && pt.OnCurve) {
// Just a line here:
glyph.LineTo(pt.X,pt.Y);
}else if (prevPoint.OnCurve && !pt.OnCurve){
controlPoint.Set(pt);
}else if(!prevPoint.OnCurve && !pt.OnCurve){
float midPointX=(prevPoint.X+pt.X)/2f;
float midPointY=(prevPoint.Y+pt.Y)/2f;
glyph.QuadraticCurveTo(prevPoint.X,prevPoint.Y,midPointX,midPointY);
controlPoint.Set(pt);
}else if(!prevPoint.OnCurve && pt.OnCurve){
// Previous point off-curve, this point on-curve.
glyph.QuadraticCurveTo(controlPoint.X,controlPoint.Y,pt.X,pt.Y);
controlPoint.Active=false;
}
}
if(firstPoint!=lastPoint){
// Close the path.
if(controlPoint.Active){
// Still got a spare control point:
glyph.QuadraticCurveTo(controlPoint.X,controlPoint.Y,firstPoint.X,firstPoint.Y);
}
// Just a normal close:
glyph.ClosePath();
}
}
}
}
if(glyph.Font.WindingUnknown){
// Find the winding now:
glyph.Font.FindWinding(glyph);
}
}
public static int LoadGlyphCoordinate(FontParser parser,byte flag,int previousValue,int shortVectorBitMask,int sameBitMask){
int v;
if((flag&shortVectorBitMask)>0){
// The coordinate is 1 byte long.
v = parser.ReadByte();
// The "same" bit is re-used for short values to signify the sign of the value.
if ((flag & sameBitMask) == 0) {
v = -v;
}
v = previousValue + v;
} else {
// The coordinate is 2 bytes long.
// If the same bit is set, the coordinate is the same as the previous coordinate.
if ((flag & sameBitMask) > 0) {
v = previousValue;
} else {
// Parse the coordinate as a signed 16-bit delta value.
v = previousValue + parser.ReadInt16();
}
}
return v;
}
public static Glyph ParseGlyph(FontParser parser,FontFace font,float range){
// How many contours has it got?
int contourCount=parser.ReadInt16();
// Skip bounds - we don't trust these too much, so we'll figure them out ourselves:
parser.Position+=8;
if(contourCount>0){
// This glyph is not a composite.
// Create the glyph:
Glyph glyph=new Glyph(font);
if(Fonts.Preload){
LoadGlyph(glyph,contourCount,parser,range);
}else{
// Increase unloaded count:
font.UnloadedGlyphs++;
// Add position info:
glyph.AddPathNode(new LoadMetaPoint(parser.Position,contourCount));
}
return glyph;
}else if(contourCount==0){
// Empty glyph e.g. space. Create the glyph:
Glyph glyph=new Glyph(font);
return glyph;
}
CompositeGlyph compGlyph=new CompositeGlyph(font);
bool moreComponents=true;
while(moreComponents){
ushort cFlags=parser.ReadUInt16();
ushort glyphIndex=parser.ReadUInt16();
VectorTransform component=new VectorTransform(glyphIndex);
if ((cFlags & 1) > 0) {
// The arguments are words
component.Dx = (float)parser.ReadInt16() / range;
component.Dy = (float)parser.ReadInt16() / range;
} else {
// The arguments are bytes
component.Dx = (float)parser.ReadByte() / range;
component.Dy = (float)parser.ReadByte() / range;
}
if ((cFlags & 8) > 0) {
// We have one scale
component.XScale = component.YScale = parser.ReadF2Dot14();
} else if ((cFlags & 64) > 0) {
// We have an X / Y scale
component.XScale = parser.ReadF2Dot14();
component.YScale = parser.ReadF2Dot14();
} else if ((cFlags & 128) > 0) {
// We have a 2x2 transformation
component.XScale = parser.ReadF2Dot14();
component.Scale01 = parser.ReadF2Dot14();
component.Scale10 = parser.ReadF2Dot14();
component.YScale = parser.ReadF2Dot14();
}
// Push the component to the end:
compGlyph.AddComponent(component);
moreComponents = ((cFlags & 32)==32);
}
return compGlyph;
}
public static bool Load(FontParser parser,int start,FontFace font,Glyph[] glyphs){
// Seek there:
parser.Position=start;
// Read the version (and check if it's zero):
if(parser.ReadUInt16()!=0){
return false;
}
// Strangely the cmap table can have lots of tables inside it. For now we're looking for the common type 3 table.
// Number of tables:
int tableCount=parser.ReadUInt16();
// Total characters in font:
int characterCount=0;
int offset=-1;
int favour=0;
for(int i = 0; i < tableCount; i += 1) {
// Grab the platform ID:
int platformId=parser.ReadUInt16();
// And the encoding ID:
int encodingId=parser.ReadUInt16();
if(platformId==3 || platformId==0){
if(encodingId==10){
// Top favourite - most broad Unicode encoding.
// Read offset:
offset=(int)parser.ReadUInt32();
break;
}else if(encodingId==1 || encodingId==0){
// Read offset:
offset=(int)parser.ReadUInt32();
// Mid-range favourite:
favour=1;
continue;
}else if(favour==0){
// Anything else we'll give a try:
// Read offset (but don't break):
offset=(int)parser.ReadUInt32();
continue;
}
}
// Skip offset:
parser.Position+=4;
}
if(offset==-1){
// We don't support this font :(
return false;
}
// Seek to the cmap now:
parser.Position=start+offset;
// Check it's format 4:
int format=parser.ReadUInt16();
if(format>6){
// We now have e.g. 12.0 - another short here:
parser.Position+=2;
// Size/ structure are both 4 byte ints now:
parser.Position+=8;
}else{
// Size of the sub-table (map length, u16):
parser.Position+=2;
// Structure of the sub-table (map language, u16):
parser.Position+=2;
}
switch(format){
case 0:
// Byte encoding table:
for(int i=0;i<256;i++){
int rByte=parser.ReadByte();
Glyph glyph=glyphs[rByte];
if(glyph!=null){
characterCount++;
glyph.AddCharcode(i);
}
}
break;
case 2:
// The offset to the headers:
int subOffset=parser.Position + (256 * 2);
// For each high byte:
for(int i=0;i<256;i++){
// Read the index to the header and zero out the bottom 3 bits:
int headerPosition=subOffset + (parser.ReadUInt16() & (~7));
// Read the header:
int firstCode=parser.ReadUInt16(ref headerPosition);
int entryCount=parser.ReadUInt16(ref headerPosition);
short idDelta=parser.ReadInt16(ref headerPosition);
// Grab the current position:
int pos=headerPosition;
// Read the idRangeOffset - the last part of the header:
pos+=parser.ReadUInt16(ref headerPosition);
int maxCode=firstCode+entryCount;
// Get the high byte value:
int highByte=(i<<8);
// For each low byte:
for (int j=firstCode;j<maxCode;j++){
// Get the full charcode (which might not actually exist yet):
int charCode=highByte+j;
// Read the base of the glyphIndex:
int p=parser.ReadUInt16(ref pos);
if(p==0){
continue;
}
p=(p+idDelta) & 0xFFFF;
if(p==0){
continue;
}
Glyph glyph=glyphs[p];
if(glyph!=null){
characterCount++;
glyph.AddCharcode(charCode);
}
}
}
break;
case 4:
// Segment count. It's doubled.
int segCount=(parser.ReadUInt16() >> 1);
// Search range, entry selector and range shift (don't need any):
parser.Position+=6;
int baseIndex=parser.Position;
int endCountIndex=baseIndex;
baseIndex+=2;
int startCountIndex = baseIndex + segCount * 2;
int idDeltaIndex = baseIndex + segCount * 4;
int idRangeOffsetIndex = baseIndex + segCount * 6;
for(int i = 0; i < segCount - 1; i ++){
int endCount = parser.ReadUInt16(ref endCountIndex);
int startCount = parser.ReadUInt16(ref startCountIndex);
int idDelta = parser.ReadInt16(ref idDeltaIndex);
int idRangeOffset = parser.ReadUInt16(ref idRangeOffsetIndex);
for(int c = startCount; c <= endCount;c++){
int glyphIndex;
if(idRangeOffset != 0){
// The idRangeOffset is relative to the current position in the idRangeOffset array.
// Take the current offset in the idRangeOffset array.
int glyphIndexOffset = (idRangeOffsetIndex - 2);
// Add the value of the idRangeOffset, which will move us into the glyphIndex array.
glyphIndexOffset += idRangeOffset;
// Then add the character index of the current segment, multiplied by 2 for USHORTs.
glyphIndexOffset += (c - startCount) * 2;
glyphIndex=parser.ReadUInt16(ref glyphIndexOffset);
if(glyphIndex!=0){
glyphIndex = (glyphIndex + idDelta) & 0xFFFF;
}
}else{
glyphIndex = (c + idDelta) & 0xFFFF;
}
// Add a charcode to the glyph now:
Glyph glyph=glyphs[glyphIndex];
if(glyph!=null){
characterCount++;
glyph.AddCharcode(c);
}
}
}
break;
case 6:
int firstCCode=parser.ReadUInt16();
int entryCCount=parser.ReadUInt16();
for(int i=0;i<entryCCount;i++){
Glyph glyphC=glyphs[parser.ReadUInt16()];
if(glyphC!=null){
characterCount++;
glyphC.AddCharcode(firstCCode+i);
}
}
break;
case 12:
int groups=(int)parser.ReadUInt32();
for(int i=0;i<groups;i++){
int startCode=(int)parser.ReadUInt32();
int endCode=(int)parser.ReadUInt32();
int startGlyph=(int)parser.ReadUInt32();
int count=(endCode - startCode);
for(int j=0;j<=count;j++){
int glyphIndex=(startGlyph+j);
Glyph glyph=glyphs[glyphIndex];
if(glyph!=null){
characterCount++;
glyph.AddCharcode(startCode+j);
}
}
}
break;
default:
Fonts.OnLogMessage("InfiniText does not currently support this font. If you need it, please contact us with this: Format: "+format);
break;
}
font.CharacterCount=characterCount;
return true;
}
private static Dictionary<int,List<int>> LoadDict(FontParser parser){
// How many are in here?
int count=parser.ReadUInt16();
if(count==0){
return null;
}
// Read the offset size:
int offsetSize=parser.ReadByte();
// Grab the position:
int position=parser.Position;
// Find where the data starts:
int objectOffset=position+((count+1)*offsetSize)-1;
// Read two only:
int firstOffset=parser.ReadOffset(offsetSize);
int secondOffset=parser.ReadOffset(offsetSize);
// Seek to the location:
parser.Position=firstOffset+objectOffset;
// Parse the dictionary now:
Dictionary<int,List<int>> set=ParseCFFDict(parser,secondOffset-firstOffset);
// Return:
parser.Position=position;
// Skip the rest:
parser.Position+=offsetSize*count;
// Read the last offset:
secondOffset=parser.ReadOffset(offsetSize);
// Seek there, minus one as their not zero based:
parser.Position+=secondOffset-1;
return set;
}
public static Glyph ParseGlyph(FontParser parser, FontFace font, float range)
{
// How many contours has it got?
int contourCount = parser.ReadInt16();
// Skip bounds - we don't trust these too much, so we'll figure them out ourselves:
parser.Position += 8;
if (contourCount > 0)
{
// This glyph is not a composite.
// Create the glyph:
Glyph glyph = new Glyph(font);
if (Fonts.Preload)
{
LoadGlyph(glyph, contourCount, parser, range);
}
else
{
// Increase unloaded count:
font.UnloadedGlyphs++;
// Add position info:
glyph.AddPathNode(new LoadMetaPoint(parser.Position, contourCount));
}
return(glyph);
}
else if (contourCount == 0)
{
// Empty glyph e.g. space. Create the glyph:
Glyph glyph = new Glyph(font);
return(glyph);
}
CompositeGlyph compGlyph = new CompositeGlyph(font);
bool moreComponents = true;
while (moreComponents)
{
ushort cFlags = parser.ReadUInt16();
ushort glyphIndex = parser.ReadUInt16();
VectorTransform component = new VectorTransform(glyphIndex);
if ((cFlags & 1) > 0)
{
// The arguments are words
component.Dx = (float)parser.ReadInt16() / range;
component.Dy = (float)parser.ReadInt16() / range;
}
else
{
// The arguments are bytes
component.Dx = (float)parser.ReadByte() / range;
component.Dy = (float)parser.ReadByte() / range;
}
if ((cFlags & 8) > 0)
{
// We have one scale
component.XScale = component.YScale = parser.ReadF2Dot14();
}
else if ((cFlags & 64) > 0)
{
// We have an X / Y scale
component.XScale = parser.ReadF2Dot14();
component.YScale = parser.ReadF2Dot14();
}
else if ((cFlags & 128) > 0)
{
// We have a 2x2 transformation
component.XScale = parser.ReadF2Dot14();
component.Scale01 = parser.ReadF2Dot14();
component.Scale10 = parser.ReadF2Dot14();
component.YScale = parser.ReadF2Dot14();
}
// Push the component to the end:
compGlyph.AddComponent(component);
moreComponents = ((cFlags & 32) == 32);
}
return(compGlyph);
}
