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