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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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