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plotter-app/venv/lib/python3.8/site-packages/matplotlib/tests/test_ft2font.py

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+from pathlib import Path
+import io
+
+import pytest
+
+from matplotlib import ft2font
+from matplotlib.testing.decorators import check_figures_equal
+import matplotlib.font_manager as fm
+import matplotlib.pyplot as plt
+
+
+def test_fallback_errors():
+    file_name = fm.findfont('DejaVu Sans')
+
+    with pytest.raises(TypeError, match="Fallback list must be a list"):
+        # failing to be a list will fail before the 0
+        ft2font.FT2Font(file_name, _fallback_list=(0,))
+
+    with pytest.raises(
+            TypeError, match="Fallback fonts must be FT2Font objects."
+    ):
+        ft2font.FT2Font(file_name, _fallback_list=[0])
+
+
+def test_ft2font_positive_hinting_factor():
+    file_name = fm.findfont('DejaVu Sans')
+    with pytest.raises(
+            ValueError, match="hinting_factor must be greater than 0"
+    ):
+        ft2font.FT2Font(file_name, 0)
+
+
+def test_fallback_smoke():
+    fp = fm.FontProperties(family=["WenQuanYi Zen Hei"])
+    if Path(fm.findfont(fp)).name != "wqy-zenhei.ttc":
+        pytest.skip("Font wqy-zenhei.ttc may be missing")
+
+    fp = fm.FontProperties(family=["Noto Sans CJK JP"])
+    if Path(fm.findfont(fp)).name != "NotoSansCJK-Regular.ttc":
+        pytest.skip("Noto Sans CJK JP font may be missing.")
+
+    plt.rcParams['font.size'] = 20
+    fig = plt.figure(figsize=(4.75, 1.85))
+    fig.text(0.05, 0.45, "There are 几个汉字 in between!",
+             family=['DejaVu Sans', "Noto Sans CJK JP"])
+    fig.text(0.05, 0.25, "There are 几个汉字 in between!",
+             family=['DejaVu Sans', "WenQuanYi Zen Hei"])
+    fig.text(0.05, 0.65, "There are 几个汉字 in between!",
+             family=["Noto Sans CJK JP"])
+    fig.text(0.05, 0.85, "There are 几个汉字 in between!",
+             family=["WenQuanYi Zen Hei"])
+
+    # TODO enable fallback for other backends!
+    for fmt in ['png', 'raw']:  # ["svg", "pdf", "ps"]:
+        fig.savefig(io.BytesIO(), format=fmt)
+
+
+@pytest.mark.parametrize('family_name, file_name',
+                         [("WenQuanYi Zen Hei",  "wqy-zenhei"),
+                          ("Noto Sans CJK JP", "NotoSansCJK")]
+                         )
+@check_figures_equal(extensions=["png", "pdf", "eps", "svg"])
+def test_font_fallback_chinese(fig_test, fig_ref, family_name, file_name):
+    fp = fm.FontProperties(family=[family_name])
+    if file_name not in Path(fm.findfont(fp)).name:
+        pytest.skip(f"Font {family_name} ({file_name}) is missing")
+
+    text = ["There are", "几个汉字", "in between!"]
+
+    plt.rcParams["font.size"] = 20
+    test_fonts = [["DejaVu Sans", family_name]] * 3
+    ref_fonts = [["DejaVu Sans"], [family_name], ["DejaVu Sans"]]
+
+    for j, (txt, test_font, ref_font) in enumerate(
+            zip(text, test_fonts, ref_fonts)
+    ):
+        fig_ref.text(0.05, .85 - 0.15*j, txt, family=ref_font)
+        fig_test.text(0.05, .85 - 0.15*j, txt, family=test_font)
+
+
+@pytest.mark.parametrize(
+    "family_name, file_name",
+    [
+        ("WenQuanYi Zen Hei", "wqy-zenhei"),
+        ("Noto Sans CJK JP", "NotoSansCJK"),
+    ],
+)
+def test__get_fontmap(family_name, file_name):
+    fp = fm.FontProperties(family=[family_name])
+    found_file_name = Path(fm.findfont(fp)).name
+    if file_name not in found_file_name:
+        pytest.skip(f"Font {family_name} ({file_name}) is missing")
+
+    text = "There are 几个汉字 in between!"
+    ft = fm.get_font(
+        fm.fontManager._find_fonts_by_props(
+            fm.FontProperties(family=["DejaVu Sans", family_name])
+        )
+    )
+
+    fontmap = ft._get_fontmap(text)
+    for char, font in fontmap.items():
+        if ord(char) > 127:
+            assert Path(font.fname).name == found_file_name
+        else:
+            assert Path(font.fname).name == "DejaVuSans.ttf"