69 lines
2.3 KiB
Python
69 lines
2.3 KiB
Python
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# Copyright (c) 2009 Type Supply LLC
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# Author: Tal Leming
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from fontTools.misc.roundTools import otRound, roundFunc
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from fontTools.misc.psCharStrings import T2CharString
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from fontTools.pens.basePen import BasePen
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from fontTools.cffLib.specializer import specializeCommands, commandsToProgram
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class T2CharStringPen(BasePen):
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"""Pen to draw Type 2 CharStrings.
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The 'roundTolerance' argument controls the rounding of point coordinates.
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It is defined as the maximum absolute difference between the original
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float and the rounded integer value.
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The default tolerance of 0.5 means that all floats are rounded to integer;
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a value of 0 disables rounding; values in between will only round floats
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which are close to their integral part within the tolerated range.
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"""
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def __init__(self, width, glyphSet, roundTolerance=0.5, CFF2=False):
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super(T2CharStringPen, self).__init__(glyphSet)
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self.round = roundFunc(roundTolerance)
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self._CFF2 = CFF2
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self._width = width
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self._commands = []
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self._p0 = (0, 0)
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def _p(self, pt):
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p0 = self._p0
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pt = self._p0 = (self.round(pt[0]), self.round(pt[1]))
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return [pt[0] - p0[0], pt[1] - p0[1]]
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def _moveTo(self, pt):
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self._commands.append(("rmoveto", self._p(pt)))
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def _lineTo(self, pt):
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self._commands.append(("rlineto", self._p(pt)))
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def _curveToOne(self, pt1, pt2, pt3):
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_p = self._p
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self._commands.append(("rrcurveto", _p(pt1) + _p(pt2) + _p(pt3)))
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def _closePath(self):
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pass
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def _endPath(self):
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pass
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def getCharString(self, private=None, globalSubrs=None, optimize=True):
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commands = self._commands
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if optimize:
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maxstack = 48 if not self._CFF2 else 513
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commands = specializeCommands(
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commands, generalizeFirst=False, maxstack=maxstack
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)
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program = commandsToProgram(commands)
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if self._width is not None:
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assert (
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not self._CFF2
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), "CFF2 does not allow encoding glyph width in CharString."
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program.insert(0, otRound(self._width))
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if not self._CFF2:
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program.append("endchar")
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charString = T2CharString(
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program=program, private=private, globalSubrs=globalSubrs
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)
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return charString
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