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first stab at compiling T2 CharStrings

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git-svn-id: svn://svn.code.sf.net/p/fonttools/code/trunk@244 4cde692c-a291-49d1-8350-778aa11640f8
This commit is contained in:
jvr 2002-05-17 07:07:26 +00:00
parent 767102ea85
commit 455af6592b
1 changed files with 55 additions and 11 deletions
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66
Lib/fontTools/misc/psCharStrings.py
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@ -2,15 +2,14 @@
CFF dictionary data and Type1/Type2 CharStrings. CFF dictionary data and Type1/Type2 CharStrings.
""" """
__version__ = "1.0b1"
__author__ = "jvr"
import types import types
import struct import struct
import string import string
DEBUG = 0
t1OperandEncoding = [None] * 256 t1OperandEncoding = [None] * 256
t1OperandEncoding[0:32] = (32) * ["do_operator"] t1OperandEncoding[0:32] = (32) * ["do_operator"]
t1OperandEncoding[32:247] = (247 - 32) * ["read_byte"] t1OperandEncoding[32:247] = (247 - 32) * ["read_byte"]
@ -68,17 +67,22 @@ class ByteCodeDecompilerBase:
if nibble1 == 0xf: if nibble1 == 0xf:
break break
number = number + realNibbles[nibble1] number = number + realNibbles[nibble1]
return string.atof(number), index return float(number), index
def buildOperatorDict(operatorList): def buildOperatorDict(operatorList):
dict = {} oper = {}
opc = {}
for item in operatorList: for item in operatorList:
if len(item) == 2: if len(item) == 2:
dict[item[0]] = item[1] oper[item[0]] = item[1]
else: else:
dict[item[0]] = item[1:] oper[item[0]] = item[1:]
return dict if type(item[0]) == types.TupleType:
opc[item[1]] = item[0]
else:
opc[item[1]] = (item[0],)
return oper, opc
t2Operators = [ t2Operators = [
@ -139,7 +143,7 @@ t2Operators = [
class T2CharString(ByteCodeDecompilerBase): class T2CharString(ByteCodeDecompilerBase):
operandEncoding = t2OperandEncoding operandEncoding = t2OperandEncoding
operators = buildOperatorDict(t2Operators) operators, opcodes = buildOperatorDict(t2Operators)
def __init__(self, bytecode=None, program=None): def __init__(self, bytecode=None, program=None):
if program is None: if program is None:
@ -153,11 +157,51 @@ class T2CharString(ByteCodeDecompilerBase):
else: else:
return "<%s (bytecode) at %x>" % (self.__class__.__name__, id(self)) return "<%s (bytecode) at %x>" % (self.__class__.__name__, id(self))
def compile(self):
if self.bytecode is not None:
return
bytecode = []
opcodes = self.opcodes
for token in self.program:
tp = type(token)
if tp == types.StringType:
if opcodes.has_key(token):
bytecode.extend(map(chr, opcodes[token]))
else:
bytecode.append(token) # hint mask
elif tp == types.FloatType:
# only in CFF
raise NotImplementedError
elif tp == types.IntType:
# XXX factor out, is largely OK for CFF dicts, too.
if -107 <= token <= 107:
code = chr(token + 139)
elif 108 <= token <= 1131:
token = token - 108
code = chr((token >> 8) + 247) + chr(token & 0xFF)
elif -1131 <= token <= -108:
token = -token - 108
code = chr((token >> 8) + 251) + chr(token & 0xFF)
elif -32768 <= token <= 32767:
# XXX T2/CFF-specific: doesn't exist in T1
code = chr(28) + struct.pack(">h", token)
else:
# XXX T1/T2-specific: different opcode in CFF
code = chr(255) + struct.pack(">l", token)
bytecode.append(code)
else:
assert 0
bytecode = "".join(bytecode)
if DEBUG:
assert bytecode == self.__bytecode
def needsDecompilation(self): def needsDecompilation(self):
return self.bytecode is not None return self.bytecode is not None
def setProgram(self, program): def setProgram(self, program):
self.program = program self.program = program
if DEBUG:
self.__bytecode = self.bytecode
self.bytecode = None self.bytecode = None
def getToken(self, index, def getToken(self, index,
@ -259,7 +303,7 @@ t1Operators = [
class T1CharString(T2CharString): class T1CharString(T2CharString):
operandEncoding = t1OperandEncoding operandEncoding = t1OperandEncoding
operators = buildOperatorDict(t1Operators) operators, opcodes = buildOperatorDict(t1Operators)
def decompile(self): def decompile(self):
if self.program is not None: if self.program is not None: