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[interpolatable] Try harder matching contours

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This improves a bunch of .notdef glyphs.
Only adverse effect is in AdventPro's --glyphs uni2116
This commit is contained in:
Behdad Esfahbod 2023-11-23 09:21:40 -07:00
parent 4591e255d2
commit 22de9ef3d8
1 changed files with 69 additions and 42 deletions
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39
Lib/fontTools/varLib/interpolatable.py
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@ -176,8 +176,6 @@ def _contour_vector_from_stats(stats):
def _matching_for_vectors(m0, m1):
n = len(m0)
if n <= 1:
return [0] * n, 0, 0
identity_matching = list(range(n))
@ -519,11 +517,11 @@ def test_gen(
# and then checking if it is the identity vector. Only if
# not, compute the StatisticsControlPen vector and check both.
n = len(allControlVectors[m0idx])
done = n <= 1
if not done:
m1Control = allControlVectors[m1idx]
m1Green = allGreenVectors[m1idx]
m0Control = allControlVectors[m0idx]
m0Green = allGreenVectors[m0idx]
(
matching_control,
matching_cost_control,
@ -531,6 +529,8 @@ def test_gen(
) = _matching_for_vectors(m0Control, m1Control)
done = matching_cost_control == identity_cost_control
if not done:
m1Green = allGreenVectors[m1idx]
m0Green = allGreenVectors[m0idx]
(
matching_green,
matching_cost_green,
@ -538,6 +538,33 @@ def test_gen(
) = _matching_for_vectors(m0Green, m1Green)
done = matching_cost_green == identity_cost_green
if not done:
# See if reversing contours in one master helps.
# That's a common problem. Then the wrong_start_point
# test will fix them.
#
# Reverse the sign of the area (0); the rest stay the same.
if not done:
m1ControlReversed = [(-m[0],) + m[1:] for m in m1Control]
(
matching_control_reversed,
matching_cost_control_reversed,
identity_cost_control_reversed,
) = _matching_for_vectors(m0Control, m1ControlReversed)
done = (
matching_cost_control_reversed == identity_cost_control_reversed
)
if not done:
m1GreenReversed = [(-m[0],) + m[1:] for m in m1Green]
(
matching_control_reversed,
matching_cost_control_reversed,
identity_cost_control_reversed,
) = _matching_for_vectors(m0Control, m1ControlReversed)
done = (
matching_cost_control_reversed == identity_cost_control_reversed
)
if not done:
# Otherwise, use the worst of the two matchings.
if (
@ -564,7 +591,7 @@ def test_gen(
"master_2": names[m1idx],
"master_1_idx": m0idx,
"master_2_idx": m1idx,
"value_1": list(range(len(m0Control))),
"value_1": list(range(n)),
"value_2": matching,
},
)