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Add a test for COLRv0 fonts
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‎LICENSE/LICENSE_OPENMOJI‎

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‎lib/matplotlib/testing/__init__.py‎

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@@ -314,3 +314,93 @@ def _gen_multi_font_text():
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# The resulting string contains 491 unique characters. Some file formats use 8-bit
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# tables, which the large number of characters exercises twice over.
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return fonts, test_str
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def _add_family_suffix(font, suffix):
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"""
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Add a suffix to all names in a font.
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This code comes from a fontTools snippet:
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https://github.com/fonttools/fonttools/blob/main/Snippets/rename-fonts.py
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"""
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WINDOWS_ENGLISH_IDS = 3, 1, 0x409
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MAC_ROMAN_IDS = 1, 0, 0
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FAMILY_RELATED_IDS = dict(LEGACY_FAMILY=1, TRUETYPE_UNIQUE_ID=3, FULL_NAME=4,
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POSTSCRIPT_NAME=6, PREFERRED_FAMILY=16, WWS_FAMILY=21)
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def get_current_family_name(table):
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family_name_rec = None
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for plat_id, enc_id, lang_id in (WINDOWS_ENGLISH_IDS, MAC_ROMAN_IDS):
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for name_id in (FAMILY_RELATED_IDS['PREFERRED_FAMILY'],
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FAMILY_RELATED_IDS['LEGACY_FAMILY']):
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family_name_rec = table.getName(nameID=name_id, platformID=plat_id,
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platEncID=enc_id, langID=lang_id)
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if family_name_rec is not None:
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return family_name_rec.toUnicode()
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raise ValueError("family name not found; can't add suffix")
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def insert_suffix(string, family_name, suffix):
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# check whether family_name is a substring
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start = string.find(family_name)
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if start != -1:
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# insert suffix after the family_name substring
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end = start + len(family_name)
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return string[:end] + suffix + string[end:]
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else:
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# it's not, we just append the suffix at the end
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return string + suffix
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def rename_record(name_record, family_name, suffix):
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string = name_record.toUnicode()
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new_string = insert_suffix(string, family_name, suffix)
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name_record.string = new_string
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return string, new_string
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table = font['name']
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family_name = get_current_family_name(table)
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ps_family_name = family_name.replace(' ', '')
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ps_suffix = suffix.replace(' ', '')
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for rec in table.names:
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name_id = rec.nameID
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if name_id not in FAMILY_RELATED_IDS.values():
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continue
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if name_id == FAMILY_RELATED_IDS['POSTSCRIPT_NAME']:
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old, new = rename_record(rec, ps_family_name, ps_suffix)
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elif name_id == FAMILY_RELATED_IDS['TRUETYPE_UNIQUE_ID']:
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# The Truetype Unique ID rec may contain either the PostScript
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# Name or the Full Name string, so we try both
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if ps_family_name in rec.toUnicode():
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old, new = rename_record(rec, ps_family_name, ps_suffix)
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else:
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old, new = rename_record(rec, family_name, suffix)
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else:
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old, new = rename_record(rec, family_name, suffix)
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return family_name
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def _generate_font_subset(path, text):
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"""
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Generate a subset of a font for testing purposes.
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The font name will be suffixed with ' MplSubset'.
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Parameters
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----------
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path : str or bytes or os.PathLike
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The path to the font to be subset. The new file will be saved in the same
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location with a ``-subset`` suffix.
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text : str
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The text from which characters to be subset will be derived. Usually fonts do
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not have a newline character, so any appearing in this text will be stripped
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before subsetting.
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"""
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from fontTools import subset
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options = subset.Options()
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font = subset.load_font(path, options)
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subsetter = subset.Subsetter(options=options)
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subsetter.populate(text=text.replace('\n', ''))
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subsetter.subset(font)
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_add_family_suffix(font, ' MplSubset')
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subset.save_font(font, path.with_stem(path.stem + '-subset'), options)

‎lib/matplotlib/testing/__init__.pyi‎

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@@ -1,6 +1,8 @@
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from collections.abc import Callable
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import os
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import subprocess
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from typing import Any, IO, Literal, overload
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from fontTools.ttLib import TTFont
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def set_font_settings_for_testing() -> None: ...
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def set_reproducibility_for_testing() -> None: ...
@@ -56,3 +58,5 @@ def ipython_in_subprocess(
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) -> None: ...
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def is_ci_environment() -> bool: ...
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def _gen_multi_font_text() -> tuple[list[str], str]: ...
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def _add_family_suffix(font: TTFont, suffix: str) -> None: ...
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def _generate_font_subset(path: str | bytes | os.PathLike, text: str) -> None: ...

‎lib/matplotlib/testing/conftest.py‎

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@@ -21,6 +21,8 @@ def pytest_configure(config):
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("filterwarnings",
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r"ignore:DynamicImporter.find_spec\(\) not found; "
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r"falling back to find_module\(\):ImportWarning"),
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("filterwarnings",
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r"ignore:Glyph .* \([lp]\) missing from font\(s\) OpenMoji MplSubset\."),
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]:
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config.addinivalue_line(key, value)
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‎lib/matplotlib/tests/baseline_images/test_text/colour.png‎

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‎lib/matplotlib/tests/data/OpenMoji-color-glyf_colr_0-subset.ttf‎

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‎lib/matplotlib/tests/test_text.py‎

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import gc
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import inspect
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import io
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from pathlib import Path
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import warnings
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import numpy as np
@@ -1320,3 +1321,35 @@ def test_text_language():
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t.set_language((('en', 0, 1), ('smn', 1, 2), ('en', 2, 3), ('smn', 3, 4)))
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assert t.get_language() == (
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('en', 0, 1), ('smn', 1, 2), ('en', 2, 3), ('smn', 3, 4))
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@image_comparison(['colour.png'], remove_text=False, style='mpl20')
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def test_colour_fonts():
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zwj = '\U0000200D'
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adult = '\U0001F9D1'
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man = '\U0001F468'
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woman = '\U0001F469'
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science = '\U0001F52C'
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technology = '\U0001F4BB'
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skin_tones = ['', *(chr(0x1F3FB + i) for i in range(5))]
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text = '\n'.join([
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''.join(person + tone + zwj + occupation for tone in skin_tones)
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for person in [adult, man, woman]
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for occupation in [science, technology]
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])
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# To generate the subsetted test file, save the latest
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# OpenMoji-color-glyf_colr_0.ttf from
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# https://github.com/hfg-gmuend/openmoji/tree/master/font to the data directory,
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# set this condition to True, and run the test.
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path = Path(__file__).parent / 'data/OpenMoji-color-glyf_colr_0.ttf'
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if False:
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from matplotlib.testing import _generate_font_subset
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_generate_font_subset(path, text)
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path = path.with_stem(path.stem + '-subset')
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fig = plt.figure()
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fig.text(0.5, 0.5, text,
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font=FontProperties(fname=path), fontsize=48,
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horizontalalignment='center', verticalalignment='center')

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