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FIX: Check for fontsize smaller than 1 pt and round up #10010

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Merged
merged 1 commit into from
Jan 15, 2018
Merged

FIX: Check for fontsize smaller than 1 pt and round up #10010

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10 changes: 10 additions & 0 deletions doc/api/api_changes/2017-12-14-JMK.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,10 @@
Fontsizes less than 1 pt are clipped to be 1 pt.
------------------------------------------------

FreeType doesn't allow fonts to get smaller than 1 pt, so all Agg
backends were silently rounding up to 1 pt. PDF (other vector
backends?) were letting us write fonts that were less than 1 pt, but
they could not be placed properly because position information comes from
FreeType. This change makes it so no backends can use fonts smaller than
1 pt, consistent with FreeType and ensuring more consistent results across
backends.
4 changes: 4 additions & 0 deletions lib/matplotlib/font_manager.py
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Expand Up @@ -875,6 +875,10 @@ def set_size(self, size):
+ ", ".join(map(str, font_scalings)))
else:
size = scale * FontManager.get_default_size()
if size < 1.0:
_log.info('Fontsize %1.2f < 1.0 pt not allowed by FreeType. '
'Setting fontsize = 1 pt', size)
size = 1.0
self._size = size

def set_file(self, file):
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