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venv/Lib/site-packages/fontTools/pens/t2CharStringPen.py

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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