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Add FontManager.addfont to register fonts at specific paths. #15068

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Merged
merged 1 commit into from
Aug 19, 2019
Merged

Add FontManager.addfont to register fonts at specific paths. #15068

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5 changes: 5 additions & 0 deletions doc/api/next_api_changes/2019-08-16-AL.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
API changes
```````````

``font_manager.createFontList`` is deprecated. `.font_manager.FontManager.addfont`
is now available to register a font at a given path.
53 changes: 48 additions & 5 deletions lib/matplotlib/font_manager.py
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Expand Up @@ -503,6 +503,7 @@ def afmFontProperty(fontpath, font):
return FontEntry(fontpath, name, style, variant, weight, stretch, size)


@cbook.deprecated("3.2", alternative="FontManager.addfont")
def createFontList(fontfiles, fontext='ttf'):
"""
A function to create a font lookup list. The default is to create
Expand Down Expand Up @@ -967,12 +968,54 @@ def __init__(self, size=None, weight='normal'):
'ttf': 'DejaVu Sans',
'afm': 'Helvetica'}

ttffiles = findSystemFonts(paths) + findSystemFonts()
self.ttflist = createFontList(ttffiles)
self.afmlist = []
self.ttflist = []
for fontext in ["afm", "ttf"]:
for path in [*findSystemFonts(paths, fontext=fontext),
*findSystemFonts(fontext=fontext)]:
self.addfont(path)

afmfiles = (findSystemFonts(paths, fontext='afm')
+ findSystemFonts(fontext='afm'))
self.afmlist = createFontList(afmfiles, fontext='afm')
def addfont(self, path):
"""
Cache the properties of the font at *path* to make it available to the
`FontManager`. The type of font is inferred from the path suffix.

Parameters
----------
path : str or path-like
"""
if Path(path).suffix.lower() == ".afm":
try:
with open(path, "rb") as fh:
font = afm.AFM(fh)
except EnvironmentError:
_log.info("Could not open font file %s", path)
return
except RuntimeError:
_log.info("Could not parse font file %s", path)
return
try:
prop = afmFontProperty(path, font)
except KeyError as exc:
_log.info("Could not extract properties for %s: %s", path, exc)
return
self.afmlist.append(prop)
else:
try:
font = ft2font.FT2Font(path)
except (OSError, RuntimeError) as exc:
_log.info("Could not open font file %s: %s", path, exc)
return
except UnicodeError:
_log.info("Cannot handle unicode filenames")
return
try:
prop = ttfFontProperty(font)
except (KeyError, RuntimeError, ValueError,
NotImplementedError) as exc:
_log.info("Could not extract properties for %s: %s", path, exc)
return
self.ttflist.append(prop)

@property
def defaultFont(self):
Expand Down