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 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 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;
}
