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Added _repr_html_ for fonts #21904

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Merged
merged 9 commits into from
Dec 16, 2021
Merged

Added _repr_html_ for fonts #21904

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5cf6533
created _repr_html_ for FontEntry objects
ambi7 Dec 10, 2021
49c6fbe
Merge branch 'main' into repr-html-fonts
ambi7 Dec 10, 2021
48053bb
fixed flake8 issues
ambi7 Dec 10, 2021
c488353
resolved flake8 warnings
ambi7 Dec 10, 2021
171d8d5
added font-face style attribute to load custom fonts from local path
ambi7 Dec 12, 2021
af03a7d
Merge branch 'main' of https://github.com/matplotlib/matplotlib into …
ambi7 Dec 12, 2021
7909992
added _repr_png_ and resulting image is used for _repr_html_
ambi7 Dec 13, 2021
1c6bdde
Merge branch 'main' of https://github.com/matplotlib/matplotlib into …
ambi7 Dec 13, 2021
9b69954
modified tests to keep important items
ambi7 Dec 16, 2021
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24 changes: 23 additions & 1 deletion lib/matplotlib/font_manager.py
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Original file line number Diff line number Diff line change
Expand Up @@ -23,8 +23,10 @@
# - setWeights function needs improvement
# - 'light' is an invalid weight value, remove it.

from base64 import b64encode
import dataclasses
from functools import lru_cache
from io import BytesIO
import json
import logging
from numbers import Number
Expand Down Expand Up @@ -380,6 +382,22 @@ def findSystemFonts(fontpaths=None, fontext='ttf'):
return [fname for fname in fontfiles if os.path.exists(fname)]


def fontentry_helper_repr_png_(fontent):
from matplotlib.figure import Figure # Circular import.
fig = Figure()
font_path = Path(fontent.fname) if fontent.fname != '' else None
fig.text(0, 0, fontent.name, font=font_path)
with BytesIO() as buf:
fig.savefig(buf, bbox_inches='tight', transparent=True)
return buf.getvalue()


def fontentry_helper_repr_html_(fontent):
png_stream = fontentry_helper_repr_png_(fontent)
png_b64 = b64encode(png_stream).decode()
return f"<img src=\"data:image/png;base64, {png_b64}\" />"


FontEntry = dataclasses.make_dataclass(
'FontEntry', [
('fname', str, dataclasses.field(default='')),
Expand All @@ -395,7 +413,11 @@ def findSystemFonts(fontpaths=None, fontext='ttf'):
A class for storing Font properties.

It is used when populating the font lookup dictionary.
"""})
""",
'_repr_html_': lambda self: fontentry_helper_repr_html_(self),
'_repr_png_': lambda self: fontentry_helper_repr_png_(self),
}
)


def ttfFontProperty(font):
Expand Down
26 changes: 23 additions & 3 deletions lib/matplotlib/tests/test_font_manager.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@
import multiprocessing
import os
from pathlib import Path
from PIL import Image
import shutil
import subprocess
import sys
Expand All @@ -11,9 +12,10 @@
import pytest

from matplotlib.font_manager import (
findfont, findSystemFonts, FontProperties, fontManager, json_dump,
json_load, get_font, is_opentype_cff_font, MSUserFontDirectories,
_get_fontconfig_fonts, ft2font, ttfFontProperty, cbook)
findfont, findSystemFonts, FontEntry, FontProperties, fontManager,
json_dump, json_load, get_font, is_opentype_cff_font,
MSUserFontDirectories, _get_fontconfig_fonts, ft2font,
ttfFontProperty, cbook)
from matplotlib import pyplot as plt, rc_context

has_fclist = shutil.which('fc-list') is not None
Expand Down Expand Up @@ -268,6 +270,24 @@ def test_fontcache_thread_safe():
f"{proc.returncode}.")


def test_fontentry_dataclass():
fontent = FontEntry(name='font-name')

png = fontent._repr_png_()
img = Image.open(BytesIO(png))
assert img.width > 0
assert img.height > 0

html = fontent._repr_html_()
assert html.startswith("<img src=\"data:image/png;base64")


def test_fontentry_dataclass_invalid_path():
with pytest.raises(FileNotFoundError):
fontent = FontEntry(fname='/random', name='font-name')
fontent._repr_html_()


@pytest.mark.skipif(sys.platform == 'win32', reason='Linux or OS only')
def test_get_font_names():
paths_mpl = [cbook._get_data_path('fonts', subdir) for subdir in ['ttf']]
Expand Down