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Improve font weight guessing #8551

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Rufflewind wants to merge 3 commits into from
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Improve font weight guessing #8551

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425e0d2
Recognize more font weights and update mapping
Rufflewind Apr 29, 2017
fac41c8
Improve font weight guesser
Rufflewind Apr 29, 2017
96a47ef
Restore original numeric weights
Rufflewind May 1, 2017
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17 changes: 14 additions & 3 deletions lib/matplotlib/font_manager.py
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Original file line number Diff line number Diff line change
Expand Up @@ -93,19 +93,25 @@
'ultra-expanded' : 900}

weight_dict = {
'hair' : 50,
'thin' : 50,
'extralight' : 100,
'ultralight' : 100,
'light' : 200,
'normal' : 400,
'regular' : 400,
'book' : 400,
'plain' : 400,
'medium' : 500,
'roman' : 500,
'semibold' : 600,
'demibold' : 600,
'demi' : 600,
'bold' : 700,
'heavy' : 800,
'extrabold' : 800,
'extra bold' : 800,
'ultrabold' : 800,
'black' : 900}

font_family_aliases = {
Expand Down Expand Up @@ -402,6 +408,7 @@ def ttfFontProperty(font):
*font* is a :class:`FT2Font` instance.
"""
name = font.family_name
style_name = font.style_name.lower().strip()

# Styles are: italic, oblique, and normal (default)

Expand Down Expand Up @@ -437,10 +444,14 @@ def ttfFontProperty(font):

weight = next((w for w in weight_dict if sfnt4.find(w) >= 0), None)
if not weight:
if font.style_flags & ft2font.BOLD:
weight = 700
else:
weight = next((w for w in weight_dict if style_name.find(w) >= 0), None)
if weight:
pass
elif style_name in ["italic", "oblique", "condensed"]:
weight = 400
else:
# give up rather than risk making mistakes (reason: #8550)
raise KeyError("unknown weight: {!r}".format(font.family_name))

# Stretch can be absolute and relative
# Absolute stretches are: ultra-condensed, extra-condensed, condensed,
Expand Down