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83 lines
3.0 KiB
Python
83 lines
3.0 KiB
Python
from .interpolatableHelpers import *
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import logging
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log = logging.getLogger("fontTools.varLib.interpolatable")
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def test_contour_order(glyph0, glyph1):
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# We try matching both the StatisticsControlPen vector
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# and the StatisticsPen vector.
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#
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# If either method found a identity matching, accept it.
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# This is crucial for fonts like Kablammo[MORF].ttf and
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# Nabla[EDPT,EHLT].ttf, since they really confuse the
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# StatisticsPen vector because of their area=0 contours.
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n = len(glyph0.controlVectors)
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matching = None
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matching_cost = 0
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identity_cost = 0
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done = n <= 1
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if not done:
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m0Control = glyph0.controlVectors
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m1Control = glyph1.controlVectors
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(
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matching_control,
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matching_cost_control,
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identity_cost_control,
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) = matching_for_vectors(m0Control, m1Control)
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done = matching_cost_control == identity_cost_control
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if not done:
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m0Green = glyph0.greenVectors
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m1Green = glyph1.greenVectors
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(
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matching_green,
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matching_cost_green,
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identity_cost_green,
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) = matching_for_vectors(m0Green, m1Green)
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done = matching_cost_green == identity_cost_green
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if not done:
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# See if reversing contours in one master helps.
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# That's a common problem. Then the wrong_start_point
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# test will fix them.
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#
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# Reverse the sign of the area (0); the rest stay the same.
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if not done:
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m1ControlReversed = [(-m[0],) + m[1:] for m in m1Control]
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(
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matching_control_reversed,
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matching_cost_control_reversed,
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identity_cost_control_reversed,
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) = matching_for_vectors(m0Control, m1ControlReversed)
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done = matching_cost_control_reversed == identity_cost_control_reversed
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if not done:
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m1GreenReversed = [(-m[0],) + m[1:] for m in m1Green]
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(
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matching_control_reversed,
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matching_cost_green_reversed,
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identity_cost_green_reversed,
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) = matching_for_vectors(m0Green, m1GreenReversed)
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done = matching_cost_green_reversed == identity_cost_green_reversed
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if not done:
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# Otherwise, use the worst of the two matchings.
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if (
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matching_cost_control / identity_cost_control
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< matching_cost_green / identity_cost_green
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):
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matching = matching_control
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matching_cost = matching_cost_control
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identity_cost = identity_cost_control
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else:
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matching = matching_green
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matching_cost = matching_cost_green
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identity_cost = identity_cost_green
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this_tolerance = matching_cost / identity_cost if identity_cost else 1
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log.debug(
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"test-contour-order: tolerance %g",
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this_tolerance,
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)
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return this_tolerance, matching
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