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from .interpolatableHelpers import *
import logging
log = logging.getLogger("fontTools.varLib.interpolatable")
def test_contour_order(glyph0, glyph1):
# We try matching both the StatisticsControlPen vector
# and the StatisticsPen vector.
#
# If either method found a identity matching, accept it.
# This is crucial for fonts like Kablammo[MORF].ttf and
# Nabla[EDPT,EHLT].ttf, since they really confuse the
# StatisticsPen vector because of their area=0 contours.
n = len(glyph0.controlVectors)
matching = None
matching_cost = 0
identity_cost = 0
done = n <= 1
if not done:
m0Control = glyph0.controlVectors
m1Control = glyph1.controlVectors
(
matching_control,
matching_cost_control,
identity_cost_control,
) = matching_for_vectors(m0Control, m1Control)
done = matching_cost_control == identity_cost_control
if not done:
m0Green = glyph0.greenVectors
m1Green = glyph1.greenVectors
(
matching_green,
matching_cost_green,
identity_cost_green,
) = 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 (
matching_cost_control / identity_cost_control
< matching_cost_green / identity_cost_green
):
matching = matching_control
matching_cost = matching_cost_control
identity_cost = identity_cost_control
else:
matching = matching_green
matching_cost = matching_cost_green
identity_cost = identity_cost_green
this_tolerance = matching_cost / identity_cost if identity_cost else 1
log.debug(
"test-contour-order: tolerance %g",
this_tolerance,
)
return this_tolerance, matching
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