Use fontTools.cu2qu instead of cu2qu

Lib/ufo2ft/filters/cubicToQuadratic.py

@@ -1,7 +1,7 @@
 import logging
 
-from cu2qu.pens import Cu2QuPointPen
-from cu2qu.ufo import CURVE_TYPE_LIB_KEY, DEFAULT_MAX_ERR
+from fontTools.cu2qu.ufo import CURVE_TYPE_LIB_KEY, DEFAULT_MAX_ERR
+from fontTools.pens.cu2quPen import Cu2QuPointPen
 
 from ufo2ft.filters import BaseFilter
 from ufo2ft.fontInfoData import getAttrWithFallback

Lib/ufo2ft/preProcessor.py

@@ -217,7 +217,7 @@ def __init__(
         layerNames=None,
         skipExportGlyphs=None,
     ):
-        from cu2qu.ufo import DEFAULT_MAX_ERR
+        from fontTools.cu2qu.ufo import DEFAULT_MAX_ERR
 
         self.ufos = ufos
         self.inplace = inplace
@@ -249,7 +249,7 @@ def __init__(
             self.postFilters.append(post)
 
     def process(self):
-        from cu2qu.ufo import fonts_to_quadratic
+        from fontTools.cu2qu.ufo import fonts_to_quadratic
 
         # first apply all custom pre-filters
         for funcs, ufo, glyphSet in zip(self.preFilters, self.ufos, self.glyphSets):

requirements.txt

@@ -1,6 +1,5 @@
 fonttools[ufo,lxml]==4.17.1
 defcon==0.7.2
-cu2qu==1.6.7
 compreffor==0.5.0
 booleanOperations==0.9.0
 cffsubr==0.2.7

setup.py

@@ -30,7 +30,6 @@
     tests_require=["pytest>=2.8"],
     install_requires=[
         "fonttools[ufo]>=4.17.1",
-        "cu2qu>=1.6.7",
         "compreffor>=0.4.6",
         "booleanOperations>=0.9.0",
     ],

tests/outlineCompiler_test.py

@@ -2,7 +2,7 @@
 import os
 
 import pytest
-from cu2qu.ufo import font_to_quadratic
+from fontTools.cu2qu.ufo import font_to_quadratic
 from fontTools.ttLib import TTFont
 from fontTools.ttLib.tables._g_l_y_f import USE_MY_METRICS
 

tests/preProcessor_test.py

@@ -2,8 +2,8 @@
 import os
 
 import pytest
-from cu2qu.ufo import CURVE_TYPE_LIB_KEY
 from fontTools import designspaceLib
+from fontTools.cu2qu.ufo import CURVE_TYPE_LIB_KEY
 
 import ufo2ft
 from ufo2ft.constants import (