1# Copyright (c) 2009 Type Supply LLC 2# Author: Tal Leming 3 4from fontTools.misc.roundTools import otRound, roundFunc 5from fontTools.misc.psCharStrings import T2CharString 6from fontTools.pens.basePen import BasePen 7from fontTools.cffLib.specializer import specializeCommands, commandsToProgram 8 9 10class T2CharStringPen(BasePen): 11 """Pen to draw Type 2 CharStrings. 12 13 The 'roundTolerance' argument controls the rounding of point coordinates. 14 It is defined as the maximum absolute difference between the original 15 float and the rounded integer value. 16 The default tolerance of 0.5 means that all floats are rounded to integer; 17 a value of 0 disables rounding; values in between will only round floats 18 which are close to their integral part within the tolerated range. 19 """ 20 21 def __init__(self, width, glyphSet, roundTolerance=0.5, CFF2=False): 22 super(T2CharStringPen, self).__init__(glyphSet) 23 self.round = roundFunc(roundTolerance) 24 self._CFF2 = CFF2 25 self._width = width 26 self._commands = [] 27 self._p0 = (0, 0) 28 29 def _p(self, pt): 30 p0 = self._p0 31 pt = self._p0 = (self.round(pt[0]), self.round(pt[1])) 32 return [pt[0] - p0[0], pt[1] - p0[1]] 33 34 def _moveTo(self, pt): 35 self._commands.append(("rmoveto", self._p(pt))) 36 37 def _lineTo(self, pt): 38 self._commands.append(("rlineto", self._p(pt))) 39 40 def _curveToOne(self, pt1, pt2, pt3): 41 _p = self._p 42 self._commands.append(("rrcurveto", _p(pt1) + _p(pt2) + _p(pt3))) 43 44 def _closePath(self): 45 pass 46 47 def _endPath(self): 48 pass 49 50 def getCharString(self, private=None, globalSubrs=None, optimize=True): 51 commands = self._commands 52 if optimize: 53 maxstack = 48 if not self._CFF2 else 513 54 commands = specializeCommands( 55 commands, generalizeFirst=False, maxstack=maxstack 56 ) 57 program = commandsToProgram(commands) 58 if self._width is not None: 59 assert ( 60 not self._CFF2 61 ), "CFF2 does not allow encoding glyph width in CharString." 62 program.insert(0, otRound(self._width)) 63 if not self._CFF2: 64 program.append("endchar") 65 charString = T2CharString( 66 program=program, private=private, globalSubrs=globalSubrs 67 ) 68 return charString 69