Merge pull request #1005 from googlefonts/drop-implied-oncurves

add option to --drop-implied-oncurves

Lib/fontmake/__main__.py

@@ -510,6 +510,12 @@ def main(args=None):
  action="store_false",
  help="Don't automatically set USE_MY_METRICS glyf component flags (0x0200).",
  )
+ contourGroup.add_argument(
+ "--drop-implied-oncurves",
+ action="store_true",
+ help="drop on-curve points that can be implied when exactly in the middle of "
+ "two off-curve points (TrueType only; default: %(default)s).",
+ )
 
  layoutGroup = parser.add_argument_group(title="Handling of OpenType Layout")
  layoutGroup.add_argument(

Lib/fontmake/font_project.py

@@ -372,6 +372,7 @@ def build_variable_fonts(
  flatten_components=False,
  filters=None,
  auto_use_my_metrics=True,
+ drop_implied_oncurves=False,
  **kwargs,
  ):
  """Build OpenType variable fonts from masters in a designspace."""
@@ -434,6 +435,7 @@ def build_variable_fonts(
  inplace=True,
  variableFontNames=list(vf_name_to_output_path),
  autoUseMyMetrics=auto_use_my_metrics,
+ dropImpliedOnCurves=drop_implied_oncurves,
  )
  else:
  fonts = ufo2ft.compileVariableCFF2s(
@@ -466,6 +468,7 @@ def _iter_compile(self, ufos, ttf=False, debugFeatureFile=None, **kwargs):
  "reverseDirection",
  "flattenComponents",
  "autoUseMyMetrics",
+ "dropImpliedOnCurves",
  ):
  options.pop(key, None)
  compile_func, fmt = ufo2ft.compileOTF, "OTF"
@@ -513,6 +516,7 @@ def save_otfs(
  generate_GDEF=True,
  fea_include_dir=None,
  auto_use_my_metrics=True,
+ drop_implied_oncurves=False,
  ):
  """Build OpenType binaries from UFOs.
 
@@ -570,6 +574,8 @@ def save_otfs(
  be disabled with other arguments.
  auto_use_my_metrics: whether to automatically set USE_MY_METRICS glyf
  component flags (0x0200). Not needed unless the font has hinted metrics.
+ drop_implied_oncurves: drop on-curve points that can be implied when exactly
+ in the middle of two off-curve points (TrueType only; default: False).
  """ # noqa: B950
  assert not (output_path and output_dir), "mutually exclusive args"
 
@@ -624,6 +630,7 @@ def save_otfs(
  flattenComponents=flatten_components,
  filters=filters,
  autoUseMyMetrics=auto_use_my_metrics,
+ dropImpliedOnCurves=drop_implied_oncurves,
  inplace=True, # avoid extra copy
  )
 

requirements.txt

@@ -1,8 +1,7 @@
-fonttools[unicode,ufo,lxml]==4.39.3; platform_python_implementation == 'CPython'
-fonttools[unicode,ufo]==4.39.3; platform_python_implementation != 'CPython'
-cu2qu==1.6.7.post1
+fonttools[unicode,ufo,lxml]==4.40.0; platform_python_implementation == 'CPython'
+fonttools[unicode,ufo]==4.40.0; platform_python_implementation != 'CPython'
 glyphsLib==6.2.1
-ufo2ft==2.31.1
+ufo2ft==2.32.0
 MutatorMath==3.0.1
 fontMath==0.9.3
 defcon[lxml]==0.10.2; platform_python_implementation == 'CPython'

setup.py

@@ -55,10 +55,10 @@
  setup_requires=wheel + ["setuptools_scm"],
  python_requires=">=3.8",
  install_requires=[
- "fonttools[ufo,lxml,unicode]>=4.39.3 ; implementation_name == 'cpython'",
- "fonttools[ufo,unicode]>=4.39.3 ; implementation_name != 'cpython'",
+ "fonttools[ufo,lxml,unicode]>=4.40.0 ; implementation_name == 'cpython'",
+ "fonttools[ufo,unicode]>=4.40.0 ; implementation_name != 'cpython'",
  "glyphsLib>=6.2.1",
- "ufo2ft[compreffor]>=2.31.1",
+ "ufo2ft[compreffor]>=2.32.0",
  "fontMath>=0.9.3",
  "ufoLib2>=0.14.0",
  "attrs>=19",