116 lines
4.0 KiB
Python
116 lines
4.0 KiB
Python
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from fontTools.misc.psCharStrings import SimpleT2Decompiler
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class StopHintCountEvent(Exception):
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pass
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class _DesubroutinizingT2Decompiler(SimpleT2Decompiler):
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stop_hintcount_ops = (
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"op_hintmask",
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"op_cntrmask",
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"op_rmoveto",
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"op_hmoveto",
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"op_vmoveto",
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)
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def __init__(self, localSubrs, globalSubrs, private=None):
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SimpleT2Decompiler.__init__(self, localSubrs, globalSubrs, private)
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def execute(self, charString):
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self.need_hintcount = True # until proven otherwise
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for op_name in self.stop_hintcount_ops:
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setattr(self, op_name, self.stop_hint_count)
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if hasattr(charString, "_desubroutinized"):
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# If a charstring has already been desubroutinized, we will still
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# need to execute it if we need to count hints in order to
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# compute the byte length for mask arguments, and haven't finished
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# counting hints pairs.
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if self.need_hintcount and self.callingStack:
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try:
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SimpleT2Decompiler.execute(self, charString)
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except StopHintCountEvent:
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del self.callingStack[-1]
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return
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charString._patches = []
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SimpleT2Decompiler.execute(self, charString)
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desubroutinized = charString.program[:]
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for idx, expansion in reversed(charString._patches):
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assert idx >= 2
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assert desubroutinized[idx - 1] in [
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"callsubr",
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"callgsubr",
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], desubroutinized[idx - 1]
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assert type(desubroutinized[idx - 2]) == int
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if expansion[-1] == "return":
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expansion = expansion[:-1]
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desubroutinized[idx - 2 : idx] = expansion
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if not self.private.in_cff2:
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if "endchar" in desubroutinized:
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# Cut off after first endchar
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desubroutinized = desubroutinized[
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: desubroutinized.index("endchar") + 1
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]
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charString._desubroutinized = desubroutinized
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del charString._patches
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def op_callsubr(self, index):
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subr = self.localSubrs[self.operandStack[-1] + self.localBias]
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SimpleT2Decompiler.op_callsubr(self, index)
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self.processSubr(index, subr)
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def op_callgsubr(self, index):
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subr = self.globalSubrs[self.operandStack[-1] + self.globalBias]
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SimpleT2Decompiler.op_callgsubr(self, index)
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self.processSubr(index, subr)
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def stop_hint_count(self, *args):
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self.need_hintcount = False
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for op_name in self.stop_hintcount_ops:
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setattr(self, op_name, None)
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cs = self.callingStack[-1]
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if hasattr(cs, "_desubroutinized"):
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raise StopHintCountEvent()
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def op_hintmask(self, index):
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SimpleT2Decompiler.op_hintmask(self, index)
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if self.need_hintcount:
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self.stop_hint_count()
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def processSubr(self, index, subr):
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cs = self.callingStack[-1]
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if not hasattr(cs, "_desubroutinized"):
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cs._patches.append((index, subr._desubroutinized))
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def desubroutinize(cff):
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for fontName in cff.fontNames:
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font = cff[fontName]
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cs = font.CharStrings
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for c in cs.values():
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c.decompile()
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subrs = getattr(c.private, "Subrs", [])
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decompiler = _DesubroutinizingT2Decompiler(subrs, c.globalSubrs, c.private)
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decompiler.execute(c)
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c.program = c._desubroutinized
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del c._desubroutinized
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# Delete all the local subrs
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if hasattr(font, "FDArray"):
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for fd in font.FDArray:
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pd = fd.Private
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if hasattr(pd, "Subrs"):
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del pd.Subrs
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if "Subrs" in pd.rawDict:
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del pd.rawDict["Subrs"]
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else:
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pd = font.Private
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if hasattr(pd, "Subrs"):
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del pd.Subrs
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if "Subrs" in pd.rawDict:
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del pd.rawDict["Subrs"]
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# as well as the global subrs
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cff.GlobalSubrs.clear()
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