258 lines
8.3 KiB
Python
258 lines
8.3 KiB
Python
from io import BytesIO, StringIO
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import multiprocessing
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import os
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from pathlib import Path
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import shutil
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import subprocess
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import sys
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import warnings
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import numpy as np
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import pytest
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from matplotlib.font_manager import (
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findfont, findSystemFonts, FontProperties, fontManager, json_dump,
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json_load, get_font, get_fontconfig_fonts, is_opentype_cff_font,
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MSUserFontDirectories, _call_fc_list)
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from matplotlib import pyplot as plt, rc_context
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has_fclist = shutil.which('fc-list') is not None
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def test_font_priority():
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with rc_context(rc={
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'font.sans-serif':
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['cmmi10', 'Bitstream Vera Sans']}):
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font = findfont(FontProperties(family=["sans-serif"]))
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assert Path(font).name == 'cmmi10.ttf'
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# Smoketest get_charmap, which isn't used internally anymore
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font = get_font(font)
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cmap = font.get_charmap()
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assert len(cmap) == 131
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assert cmap[8729] == 30
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def test_score_weight():
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assert 0 == fontManager.score_weight("regular", "regular")
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assert 0 == fontManager.score_weight("bold", "bold")
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assert (0 < fontManager.score_weight(400, 400) <
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fontManager.score_weight("normal", "bold"))
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assert (0 < fontManager.score_weight("normal", "regular") <
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fontManager.score_weight("normal", "bold"))
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assert (fontManager.score_weight("normal", "regular") ==
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fontManager.score_weight(400, 400))
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def test_json_serialization(tmpdir):
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# Can't open a NamedTemporaryFile twice on Windows, so use a temporary
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# directory instead.
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path = Path(tmpdir, "fontlist.json")
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json_dump(fontManager, path)
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copy = json_load(path)
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with warnings.catch_warnings():
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warnings.filterwarnings('ignore', 'findfont: Font family.*not found')
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for prop in ({'family': 'STIXGeneral'},
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{'family': 'Bitstream Vera Sans', 'weight': 700},
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{'family': 'no such font family'}):
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fp = FontProperties(**prop)
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assert (fontManager.findfont(fp, rebuild_if_missing=False) ==
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copy.findfont(fp, rebuild_if_missing=False))
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def test_otf():
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fname = '/usr/share/fonts/opentype/freefont/FreeMono.otf'
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if Path(fname).exists():
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assert is_opentype_cff_font(fname)
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for f in fontManager.ttflist:
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if 'otf' in f.fname:
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with open(f.fname, 'rb') as fd:
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res = fd.read(4) == b'OTTO'
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assert res == is_opentype_cff_font(f.fname)
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@pytest.mark.skipif(not has_fclist, reason='no fontconfig installed')
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def test_get_fontconfig_fonts():
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assert len(get_fontconfig_fonts()) > 1
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@pytest.mark.parametrize('factor', [2, 4, 6, 8])
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def test_hinting_factor(factor):
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font = findfont(FontProperties(family=["sans-serif"]))
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font1 = get_font(font, hinting_factor=1)
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font1.clear()
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font1.set_size(12, 100)
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font1.set_text('abc')
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expected = font1.get_width_height()
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hinted_font = get_font(font, hinting_factor=factor)
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hinted_font.clear()
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hinted_font.set_size(12, 100)
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hinted_font.set_text('abc')
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# Check that hinting only changes text layout by a small (10%) amount.
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np.testing.assert_allclose(hinted_font.get_width_height(), expected,
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rtol=0.1)
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def test_utf16m_sfnt():
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try:
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# seguisbi = Microsoft Segoe UI Semibold
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entry = next(entry for entry in fontManager.ttflist
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if Path(entry.fname).name == "seguisbi.ttf")
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except StopIteration:
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pytest.skip("Couldn't find font to test against.")
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else:
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# Check that we successfully read "semibold" from the font's sfnt table
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# and set its weight accordingly.
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assert entry.weight == 600
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def test_find_ttc():
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fp = FontProperties(family=["WenQuanYi Zen Hei"])
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if Path(findfont(fp)).name != "wqy-zenhei.ttc":
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pytest.skip("Font may be missing")
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fig, ax = plt.subplots()
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ax.text(.5, .5, "\N{KANGXI RADICAL DRAGON}", fontproperties=fp)
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for fmt in ["raw", "svg", "pdf", "ps"]:
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fig.savefig(BytesIO(), format=fmt)
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def test_find_invalid(tmpdir):
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tmp_path = Path(tmpdir)
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with pytest.raises(FileNotFoundError):
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get_font(tmp_path / 'non-existent-font-name.ttf')
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with pytest.raises(FileNotFoundError):
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get_font(str(tmp_path / 'non-existent-font-name.ttf'))
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with pytest.raises(FileNotFoundError):
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get_font(bytes(tmp_path / 'non-existent-font-name.ttf'))
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# Not really public, but get_font doesn't expose non-filename constructor.
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from matplotlib.ft2font import FT2Font
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with pytest.raises(TypeError, match='path or binary-mode file'):
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FT2Font(StringIO())
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@pytest.mark.skipif(sys.platform != 'linux', reason='Linux only')
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def test_user_fonts_linux(tmpdir, monkeypatch):
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font_test_file = 'mpltest.ttf'
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# Precondition: the test font should not be available
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fonts = findSystemFonts()
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if any(font_test_file in font for font in fonts):
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pytest.skip(f'{font_test_file} already exists in system fonts')
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# Prepare a temporary user font directory
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user_fonts_dir = tmpdir.join('fonts')
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user_fonts_dir.ensure(dir=True)
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shutil.copyfile(Path(__file__).parent / font_test_file,
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user_fonts_dir.join(font_test_file))
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with monkeypatch.context() as m:
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m.setenv('XDG_DATA_HOME', str(tmpdir))
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_call_fc_list.cache_clear()
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# Now, the font should be available
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fonts = findSystemFonts()
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assert any(font_test_file in font for font in fonts)
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# Make sure the temporary directory is no longer cached.
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_call_fc_list.cache_clear()
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@pytest.mark.skipif(sys.platform != 'win32', reason='Windows only')
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def test_user_fonts_win32():
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if not (os.environ.get('APPVEYOR') or os.environ.get('TF_BUILD')):
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pytest.xfail("This test should only run on CI (appveyor or azure) "
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"as the developer's font directory should remain "
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"unchanged.")
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font_test_file = 'mpltest.ttf'
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# Precondition: the test font should not be available
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fonts = findSystemFonts()
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if any(font_test_file in font for font in fonts):
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pytest.skip(f'{font_test_file} already exists in system fonts')
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user_fonts_dir = MSUserFontDirectories[0]
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# Make sure that the user font directory exists (this is probably not the
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# case on Windows versions < 1809)
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os.makedirs(user_fonts_dir)
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# Copy the test font to the user font directory
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shutil.copy(Path(__file__).parent / font_test_file, user_fonts_dir)
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# Now, the font should be available
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fonts = findSystemFonts()
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assert any(font_test_file in font for font in fonts)
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def _model_handler(_):
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fig, ax = plt.subplots()
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fig.savefig(BytesIO(), format="pdf")
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plt.close()
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@pytest.mark.skipif(not hasattr(os, "register_at_fork"),
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reason="Cannot register at_fork handlers")
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def test_fork():
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_model_handler(0) # Make sure the font cache is filled.
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ctx = multiprocessing.get_context("fork")
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with ctx.Pool(processes=2) as pool:
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pool.map(_model_handler, range(2))
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def test_missing_family(caplog):
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plt.rcParams["font.sans-serif"] = ["this-font-does-not-exist"]
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with caplog.at_level("WARNING"):
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findfont("sans")
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assert [rec.getMessage() for rec in caplog.records] == [
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"findfont: Font family ['sans'] not found. "
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"Falling back to DejaVu Sans.",
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"findfont: Generic family 'sans' not found because none of the "
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"following families were found: this-font-does-not-exist",
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]
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def _test_threading():
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import threading
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from matplotlib.ft2font import LOAD_NO_HINTING
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import matplotlib.font_manager as fm
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N = 10
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b = threading.Barrier(N)
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def bad_idea(n):
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b.wait()
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for j in range(100):
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font = fm.get_font(fm.findfont("DejaVu Sans"))
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font.set_text(str(n), 0.0, flags=LOAD_NO_HINTING)
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threads = [
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threading.Thread(target=bad_idea, name=f"bad_thread_{j}", args=(j,))
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for j in range(N)
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]
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for t in threads:
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t.start()
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for t in threads:
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t.join()
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def test_fontcache_thread_safe():
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pytest.importorskip('threading')
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import inspect
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proc = subprocess.run(
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[sys.executable, "-c",
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inspect.getsource(_test_threading) + '\n_test_threading()']
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)
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if proc.returncode:
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pytest.fail("The subprocess returned with non-zero exit status "
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f"{proc.returncode}.")
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