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font-patcher: Fix: Use WIN metrics in all conflicting cases

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[why]
With commit
  621008773  font-patcher: Use WIN metrics in all conflicting cases
we intended to use the WIN metrics for the baseline to baseline
calculations for fonts that have contradicting (i.e. broken) metrices.

But we use the TYPO metrics instead.

[how]
This is obviously a typo in the code. To prevent such errors and improve
the readability we use Enums now. I believe we silently dropped support
for Python 2 some time back. And if not we drop it today :-}

[note]
Many thanks to Nathaniel Evan for again finding this bug!

Mentioned in: #1116

Signed-off-by: Fini Jastrow <ulf.fini.jastrow@desy.de>
This commit is contained in:
Fini Jastrow 2023-02-12 16:35:20 +01:00
parent b112fe12de
commit 62b972b431
1 changed files with 11 additions and 6 deletions
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17
font-patcher
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@ -6,7 +6,7 @@
from __future__ import absolute_import, print_function, unicode_literals
# Change the script version when you edit this script:
script_version = "3.5.6"
script_version = "3.5.7"
version = "2.3.3"
projectName = "Nerd Fonts"
@ -21,6 +21,7 @@ from argparse import RawTextHelpFormatter
import errno
import subprocess
import json
from enum import Enum
try:
import configparser
except ImportError:
@ -996,30 +997,34 @@ class font_patcher:
(hhea_btb, typo_btb, win_btb, win_gap) = get_btb_metrics(self.sourceFont)
use_typo = self.sourceFont.os2_use_typo_metrics != 0
Metric = Enum('Metric', ['HHEA', 'TYPO', 'WIN'])
# We use either TYPO (1) or WIN (2) and compare with HHEA
# and use HHEA (0) if the fonts seems broken - no WIN, see #1056
our_btb = typo_btb if use_typo else win_btb
if our_btb == hhea_btb:
metrics = 1 if use_typo else 2 # conforming font
metrics = Metric.TYPO if use_typo else Metric.WIN # conforming font
else:
# We trust the WIN metric more, see experiments in #1056
print("{}: WARNING Font vertical metrics inconsistent (HHEA {} / TYPO {} / WIN {}), using WIN".format(projectName, hhea_btb, typo_btb, win_btb))
our_btb = win_btb
metrics = 1
metrics = Metric.WIN
# print("FINI hhea {} typo {} win {} use {} {} {}".format(hhea_btb, typo_btb, win_btb, use_typo, our_btb != hhea_btb, self.sourceFont.fontname))
self.font_dim = {'xmin': 0, 'ymin': 0, 'xmax': 0, 'ymax': 0, 'width' : 0, 'height': 0}
if metrics == 0:
if metrics == Metric.HHEA:
self.font_dim['ymin'] = self.sourceFont.hhea_descent - half_gap(self.sourceFont.hhea_linegap, False)
self.font_dim['ymax'] = self.sourceFont.hhea_ascent + half_gap(self.sourceFont.hhea_linegap, True)
elif metrics == 1:
elif metrics == Metric.TYPO:
self.font_dim['ymin'] = self.sourceFont.os2_typodescent - half_gap(self.sourceFont.os2_typolinegap, False)
self.font_dim['ymax'] = self.sourceFont.os2_typoascent + half_gap(self.sourceFont.os2_typolinegap, True)
else:
elif metrics == Metric.WIN:
self.font_dim['ymin'] = -self.sourceFont.os2_windescent - half_gap(win_gap, False)
self.font_dim['ymax'] = self.sourceFont.os2_winascent + half_gap(win_gap, True)
else:
pass # Will fail the metrics check some line later
# Calculate font height
self.font_dim['height'] = -self.font_dim['ymin'] + self.font_dim['ymax']