void AddStemToList(OperatorName stemName, ref int hintStemCount)
{
//support 4 kinds
//1.
//|- y dy {dya dyb}* hstemhm (18) |-
//2.
//|- x dx {dxa dxb}* vstemhm (23) |-
//3.
//|- y dy {dya dyb}* hstem (1) |-
//4.
//|- x dx {dxa dxb}* vstem (3) |-
//-----------------------
//notes
//The sequence and form of a Type 2 charstring program may be
//represented as:
//w? { hs* vs*cm * hm * mt subpath}? { mt subpath} *endchar
if ((current_int_count % 2) != 0)
{
//all kind has even number of stem
if (foundSomeStem)
{
#if DEBUG
insts.dbugDumpInstructionListToFile("d:\\WImageTest\\test_type2_" + (_dbugInstructionListMark - 1) + ".txt");
#endif
throw new NotSupportedException();
}
else
{
//the first one is 'width'
insts.ChangeFirstInstToGlyphWidthValue();
current_int_count--;
}
}
hintStemCount += (current_int_count / 2); //save a snapshot of stem count
insts.AddOp(stemName);
current_int_count = 0; //clear
foundSomeStem = true;
_latestOpName = stemName;
}
public Type2GlyphInstructionList ParseType2CharString(byte[] buffer)
{
//reset
current_int_count = 0;
foundSomeStem = false;
doStemCount = true;
_msBuffer.SetLength(0);
_msBuffer.Position = 0;
_msBuffer.Write(buffer, 0, buffer.Length);
_msBuffer.Position = 0;
int len = buffer.Length;
//
insts = new Type2GlyphInstructionList();
#if DEBUG
insts.dbugMark = _dbugInstructionListMark;
//if (_dbugInstructionListMark == 5)
//{
//}
_dbugInstructionListMark++;
#endif
byte b0 = 0;
int hintStemCount = 0;
bool cont = true;
while (cont && _reader.BaseStream.Position < len)
{
b0 = _reader.ReadByte();
#if DEBUG
//easy for debugging here
_dbugCount++;
if (b0 < 32)
{
}
#endif
switch (b0)
{
default: //else 32 -255
{
if (b0 < 32)
{
Debug.WriteLine("err!:" + b0);
return(null);
}
insts.AddInt(ReadIntegerNumber(b0));
if (doStemCount)
{
current_int_count++;
}
}
break;
case (byte)Type2Operator1.shortint: // 28
//shortint
//First byte of a 3-byte sequence specifying a number.
//a ShortInt value is specified by using the operator (28) followed by two bytes
//which represent numbers between –32768 and + 32767.The
//most significant byte follows the(28)
byte s_b0 = _reader.ReadByte();
byte s_b1 = _reader.ReadByte();
insts.AddInt((short)((s_b0 << 8) | (s_b1)));
//
if (doStemCount)
{
current_int_count++;
}
break;
//---------------------------------------------------
case (byte)Type2Operator1._Reserved0_: //???
case (byte)Type2Operator1._Reserved2_: //???
case (byte)Type2Operator1._Reserved9_: //???
case (byte)Type2Operator1._Reserved13_: //???
case (byte)Type2Operator1._Reserved15_: //???
case (byte)Type2Operator1._Reserved16_: //???
case (byte)Type2Operator1._Reserved17_: //???
//reserved, do nothing ?
break;
case (byte)Type2Operator1.endchar:
insts.AddOp(OperatorName.endchar);
cont = false;
//when we found end char
//stop reading this...
break;
case (byte)Type2Operator1.escape: //12
{
b0 = _reader.ReadByte();
switch ((Type2Operator2)b0)
{
default:
if (b0 <= 38)
{
Debug.WriteLine("err!:" + b0);
return(null);
}
break;
//-------------------------
//4.1: Path Construction Operators
case Type2Operator2.flex: insts.AddOp(OperatorName.flex); break;
case Type2Operator2.hflex: insts.AddOp(OperatorName.hflex); break;
case Type2Operator2.hflex1: insts.AddOp(OperatorName.hflex1); break;
case Type2Operator2.flex1: insts.AddOp(OperatorName.flex1);; break;
//-------------------------
//4.4: Arithmetic Operators
case Type2Operator2.abs: insts.AddOp(OperatorName.abs); break;
case Type2Operator2.add: insts.AddOp(OperatorName.add); break;
case Type2Operator2.sub: insts.AddOp(OperatorName.sub); break;
case Type2Operator2.div: insts.AddOp(OperatorName.div); break;
case Type2Operator2.neg: insts.AddOp(OperatorName.neg); break;
case Type2Operator2.random: insts.AddOp(OperatorName.random); break;
case Type2Operator2.mul: insts.AddOp(OperatorName.mul); break;
case Type2Operator2.sqrt: insts.AddOp(OperatorName.sqrt); break;
case Type2Operator2.drop: insts.AddOp(OperatorName.drop); break;
case Type2Operator2.exch: insts.AddOp(OperatorName.exch); break;
case Type2Operator2.index: insts.AddOp(OperatorName.index); break;
case Type2Operator2.roll: insts.AddOp(OperatorName.roll); break;
case Type2Operator2.dup: insts.AddOp(OperatorName.dup); break;
//-------------------------
//4.5: Storage Operators
case Type2Operator2.put: insts.AddOp(OperatorName.put); break;
case Type2Operator2.get: insts.AddOp(OperatorName.get); break;
//-------------------------
//4.6: Conditional
case Type2Operator2.and: insts.AddOp(OperatorName.and); break;
case Type2Operator2.or: insts.AddOp(OperatorName.or); break;
case Type2Operator2.not: insts.AddOp(OperatorName.not); break;
case Type2Operator2.eq: insts.AddOp(OperatorName.eq); break;
case Type2Operator2.ifelse: insts.AddOp(OperatorName.ifelse); break;
}
StopStemCount();
}
break;
case (byte)Type2Operator1.rmoveto: insts.AddOp(OperatorName.rmoveto); StopStemCount(); break;
case (byte)Type2Operator1.hmoveto: insts.AddOp(OperatorName.hmoveto); StopStemCount(); break;
case (byte)Type2Operator1.vmoveto: insts.AddOp(OperatorName.vmoveto); StopStemCount(); break;
//---------------------------------------------------------------------------
case (byte)Type2Operator1.rlineto: insts.AddOp(OperatorName.rlineto); StopStemCount(); break;
case (byte)Type2Operator1.hlineto: insts.AddOp(OperatorName.hlineto); StopStemCount(); break;
case (byte)Type2Operator1.vlineto: insts.AddOp(OperatorName.vlineto); StopStemCount(); break;
case (byte)Type2Operator1.rrcurveto: insts.AddOp(OperatorName.rrcurveto); StopStemCount(); break;
case (byte)Type2Operator1.hhcurveto: insts.AddOp(OperatorName.hhcurveto); StopStemCount(); break;
case (byte)Type2Operator1.hvcurveto: insts.AddOp(OperatorName.hvcurveto); StopStemCount(); break;
case (byte)Type2Operator1.rcurveline: insts.AddOp(OperatorName.rcurveline); StopStemCount(); break;
case (byte)Type2Operator1.rlinecurve: insts.AddOp(OperatorName.rlinecurve); StopStemCount(); break;
case (byte)Type2Operator1.vhcurveto: insts.AddOp(OperatorName.vhcurveto); StopStemCount(); break;
case (byte)Type2Operator1.vvcurveto: insts.AddOp(OperatorName.vvcurveto); StopStemCount(); break;
//-------------------------------------------------------------------
//4.3 Hint Operators
case (byte)Type2Operator1.hstem: AddStemToList(OperatorName.hstem, ref hintStemCount); break;
case (byte)Type2Operator1.vstem: AddStemToList(OperatorName.vstem, ref hintStemCount); break;
case (byte)Type2Operator1.vstemhm: AddStemToList(OperatorName.vstemhm, ref hintStemCount); break;
case (byte)Type2Operator1.hstemhm: AddStemToList(OperatorName.hstemhm, ref hintStemCount); break;
//-------------------------------------------------------------------
case (byte)Type2Operator1.hintmask: AddHintMaskToList(_reader, ref hintStemCount); StopStemCount(); break;
case (byte)Type2Operator1.cntrmask: AddCounterMaskToList(_reader, ref hintStemCount); StopStemCount(); break;
//-------------------------------------------------------------------
//4.7: Subroutine Operators
case (byte)Type2Operator1.callsubr: insts.AddOp(OperatorName.callsubr); StopStemCount(); break;
case (byte)Type2Operator1.callgsubr: insts.AddOp(OperatorName.callgsubr); StopStemCount(); break;
case (byte)Type2Operator1._return: insts.AddOp(OperatorName._return); StopStemCount(); break;
}
}
return(insts);
}