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font-patcher: Fix monospaced glyph collection detection

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[why]
When only one symbol glyph is examined we conclude that it comes from a
monospaced glyph set.

This might be correct or not, but when we can not positively say it is
monospaced we should not handle it as monospaced.

[how]
We require at least TWO glyphs with the same width (and no glyph
with a different width) until we set the 'advance' bounding box
property. Which says that this particular glyph subset is monospaced.

Signed-off-by: Fini Jastrow <ulf.fini.jastrow@desy.de>
This commit is contained in:
Fini Jastrow 2023-01-03 09:58:10 +01:00
parent 46eb6e451c
commit 3cfe4a1a06
1 changed files with 5 additions and 2 deletions
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font-patcher
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@ -1316,11 +1316,14 @@ def get_multiglyph_boundingBox(glyphs, destGlyph = None):
bbox[2] = gbb[2] if bbox[2] is None or bbox[2] < gbb[2] else bbox[2]
bbox[3] = gbb[3] if bbox[3] is None or bbox[3] < gbb[3] else bbox[3]
if not bbox[4]:
bbox[4] = gadvance
bbox[4] = -gadvance # Negative for one/first glyph
else:
if bbox[4] != gadvance:
if abs(bbox[4]) != gadvance:
bbox[4] = -1 # Marker for not-monospaced
else:
bbox[4] = gadvance # Positive for 2 or more glyphs
if bbox[4] and bbox[4] < 0:
# Not monospaced when only one glyph is used or multiple glyphs with different advance widths
bbox[4] = None
return {
'xmin' : bbox[0],