Add tests that hinting_factor works.

matplotlib · anntzer · Nov 4, 2017 · Oct 19, 2017 · Oct 20, 2017 · Oct 21, 2017
commit 6a685d2d3e6be4271db55c56eceb90c2a973c511
diff --git a/lib/matplotlib/tests/test_font_manager.py b/lib/matplotlib/tests/test_font_manager.py
@@ -7,6 +7,7 @@
 import tempfile
 import warnings

+import numpy as np
 import pytest

 from matplotlib.font_manager import (
@@ -86,3 +87,22 @@ def test_otf():
 @pytest.mark.skipif(not has_fclist, reason='no fontconfig installed')
 def test_get_fontconfig_fonts():
    assert len(get_fontconfig_fonts()) > 1
+
+
+@pytest.mark.parametrize('factor', [2, 4, 6, 8])
+def test_hinting_factor(factor):
+    font = findfont(FontProperties(family=["sans-serif"]))
+
+    font1 = get_font(font, hinting_factor=1)
+    font1.clear()
+    font1.set_size(12, 100)
+    font1.set_text('abc')
+    expected = font1.get_width_height()
+
+    hinted_font = get_font(font, hinting_factor=factor)
+    hinted_font.clear()
+    hinted_font.set_size(12, 100)
+    hinted_font.set_text('abc')
+    # Check that hinting only changes text layout by a small (10%) amount.
+    np.testing.assert_allclose(hinted_font.get_width_height(), expected,
+                               rtol=0.1)
diff --git a/lib/matplotlib/tests/test_text.py b/lib/matplotlib/tests/test_text.py
@@ -2,6 +2,8 @@
                        unicode_literals)

 import six
+
+import io
 import warnings

 import numpy as np
@@ -448,3 +450,17 @@ def test_nonfinite_pos():
    ax.text(0, np.nan, 'nan')
    ax.text(np.inf, 0, 'inf')
    fig.canvas.draw()
+
+
+def test_hinting_factor_backends():
+    plt.rcParams['text.hinting_factor'] = 1
+    fig = plt.figure()
+    t = fig.text(0.5, 0.5, 'some text')
+
+    fig.savefig(io.BytesIO(), format='svg')
+    expected = t.get_window_extent().intervalx
+
+    fig.savefig(io.BytesIO(), format='png')
+    # Backends should apply hinting_factor consistently (within 10%).
+    np.testing.assert_allclose(t.get_window_extent().intervalx, expected,
+                               rtol=0.1)