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font-patcher: Fix crash if no roman characters

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[why]
When we can not detect the cell width, for example because there are no
glyphs in the range of extrended-roman that we examine, the width will
be zero and that will result in a crash later on (on rescaling).

[how]
Just abort if height or width are zero or negative.

Related: #1460

Signed-off-by: Fini Jastrow <ulf.fini.jastrow@desy.de>
This commit is contained in:
Fini Jastrow 2023-12-18 15:08:00 +01:00 committed by Fini
parent ee6d42f27f
commit 19c4162241
1 changed files with 5 additions and 2 deletions
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7
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 = "4.8.2"
script_version = "4.8.3"
version = "3.1.1"
projectName = "Nerd Fonts"
@ -1212,7 +1212,7 @@ class font_patcher:
'height': self.sourceFont.descent + self.sourceFont.ascent,
}
our_btb = self.sourceFont.descent + self.sourceFont.ascent
elif self.font_dim['height'] < 0:
if self.font_dim['height'] <= 0:
logger.critical("Can not detect sane font height")
sys.exit(1)
@ -1266,6 +1266,9 @@ class font_patcher:
if self.font_dim['width'] < self.font_dim['xmax']:
logger.debug("Font has negative right side bearing in extended glyphs")
self.font_dim['xmax'] = self.font_dim['width'] # In fact 'xmax' is never used
if self.font_dim['width'] <= 0:
logger.critical("Can not detect sane font width")
sys.exit(1)
logger.debug("Final font cell dimensions %d w x %d h", self.font_dim['width'], self.font_dim['height'])
self.xavgwidth.append(self.args.xavgwidth)