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Pillow/Tests/test_imagefont.py
Jon Dufresne 7da17ad41e Improve pytest configuration to allow specific tests as CLI args 
The previous test configuration made it difficult to run a single test
with the pytest CLI. There were two major issues:

- The Tests directory was not a package. It now includes a __init__.py
  file and imports from other tests modules are done with relative
  imports.

- setup.cfg always specified the Tests directory. So even if a specific
  test were specified as a CLI arg, this configuration would also always
  include all tests. This configuration has been removed to allow
  specifying a single test on the command line.

Contributors can now run specific tests with a single command such as:

  $ tox -e py37 -- Tests/test_file_pdf.py::TestFilePdf.test_rgb

This makes it easy and faster to iterate on a single test failure and is
very familiar to those that have previously used tox and pytest.

When running tox or pytest with no arguments, they still discover and
runs all tests in the Tests directory.
2019-01-13 09:00:12 -08:00

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# -*- coding: utf-8 -*-
from .helper import unittest, PillowTestCase
from PIL import Image, ImageDraw, ImageFont, features
from io import BytesIO
import os
import sys
import copy
FONT_PATH = "Tests/fonts/FreeMono.ttf"
FONT_SIZE = 20
TEST_TEXT = "hey you\nyou are awesome\nthis looks awkward"
HAS_FREETYPE = features.check('freetype2')
HAS_RAQM = features.check('raqm')
class SimplePatcher(object):
def __init__(self, parent_obj, attr_name, value):
self._parent_obj = parent_obj
self._attr_name = attr_name
self._saved = None
self._is_saved = False
self._value = value
def __enter__(self):
# Patch the attr on the object
if hasattr(self._parent_obj, self._attr_name):
self._saved = getattr(self._parent_obj, self._attr_name)
setattr(self._parent_obj, self._attr_name, self._value)
self._is_saved = True
else:
setattr(self._parent_obj, self._attr_name, self._value)
self._is_saved = False
def __exit__(self, type, value, traceback):
# Restore the original value
if self._is_saved:
setattr(self._parent_obj, self._attr_name, self._saved)
else:
delattr(self._parent_obj, self._attr_name)
@unittest.skipUnless(HAS_FREETYPE, "ImageFont not available")
class TestImageFont(PillowTestCase):
LAYOUT_ENGINE = ImageFont.LAYOUT_BASIC
# Freetype has different metrics depending on the version.
# (and, other things, but first things first)
METRICS = {
('2', '3'): {'multiline': 30,
'textsize': 12,
'getters': (13, 16)},
('2', '7'): {'multiline': 6.2,
'textsize': 2.5,
'getters': (12, 16)},
('2', '8'): {'multiline': 6.2,
'textsize': 2.5,
'getters': (12, 16)},
('2', '9'): {'multiline': 6.2,
'textsize': 2.5,
'getters': (12, 16)},
'Default': {'multiline': 0.5,
'textsize': 0.5,
'getters': (12, 16)},
}
def setUp(self):
freetype_version = tuple(
ImageFont.core.freetype2_version.split('.')
)[:2]
self.metrics = self.METRICS.get(freetype_version,
self.METRICS['Default'])
def get_font(self):
return ImageFont.truetype(FONT_PATH, FONT_SIZE,
layout_engine=self.LAYOUT_ENGINE)
def test_sanity(self):
self.assertRegex(ImageFont.core.freetype2_version, r"\d+\.\d+\.\d+$")
def test_font_properties(self):
ttf = self.get_font()
self.assertEqual(ttf.path, FONT_PATH)
self.assertEqual(ttf.size, FONT_SIZE)
ttf_copy = ttf.font_variant()
self.assertEqual(ttf_copy.path, FONT_PATH)
self.assertEqual(ttf_copy.size, FONT_SIZE)
ttf_copy = ttf.font_variant(size=FONT_SIZE+1)
self.assertEqual(ttf_copy.size, FONT_SIZE+1)
second_font_path = "Tests/fonts/DejaVuSans.ttf"
ttf_copy = ttf.font_variant(font=second_font_path)
self.assertEqual(ttf_copy.path, second_font_path)
def test_font_with_name(self):
self.get_font()
self._render(FONT_PATH)
def _font_as_bytes(self):
with open(FONT_PATH, 'rb') as f:
font_bytes = BytesIO(f.read())
return font_bytes
def test_font_with_filelike(self):
ImageFont.truetype(self._font_as_bytes(), FONT_SIZE,
layout_engine=self.LAYOUT_ENGINE)
self._render(self._font_as_bytes())
# Usage note: making two fonts from the same buffer fails.
# shared_bytes = self._font_as_bytes()
# self._render(shared_bytes)
# self.assertRaises(Exception, _render, shared_bytes)
def test_font_with_open_file(self):
with open(FONT_PATH, 'rb') as f:
self._render(f)
def _render(self, font):
txt = "Hello World!"
ttf = ImageFont.truetype(font, FONT_SIZE,
layout_engine=self.LAYOUT_ENGINE)
ttf.getsize(txt)
img = Image.new("RGB", (256, 64), "white")
d = ImageDraw.Draw(img)
d.text((10, 10), txt, font=ttf, fill='black')
return img
def test_render_equal(self):
img_path = self._render(FONT_PATH)
with open(FONT_PATH, 'rb') as f:
font_filelike = BytesIO(f.read())
img_filelike = self._render(font_filelike)
self.assert_image_equal(img_path, img_filelike)
def test_textsize_equal(self):
im = Image.new(mode='RGB', size=(300, 100))
draw = ImageDraw.Draw(im)
ttf = self.get_font()
txt = "Hello World!"
size = draw.textsize(txt, ttf)
draw.text((10, 10), txt, font=ttf)
draw.rectangle((10, 10, 10 + size[0], 10 + size[1]))
target = 'Tests/images/rectangle_surrounding_text.png'
target_img = Image.open(target)
# Epsilon ~.5 fails with FreeType 2.7
self.assert_image_similar(im, target_img, self.metrics['textsize'])
def test_render_multiline(self):
im = Image.new(mode='RGB', size=(300, 100))
draw = ImageDraw.Draw(im)
ttf = self.get_font()
line_spacing = draw.textsize('A', font=ttf)[1] + 4
lines = TEST_TEXT.split("\n")
y = 0
for line in lines:
draw.text((0, y), line, font=ttf)
y += line_spacing
target = 'Tests/images/multiline_text.png'
target_img = Image.open(target)
# some versions of freetype have different horizontal spacing.
# setting a tight epsilon, I'm showing the original test failure
# at epsilon = ~38.
self.assert_image_similar(im, target_img, self.metrics['multiline'])
def test_render_multiline_text(self):
ttf = self.get_font()
# Test that text() correctly connects to multiline_text()
# and that align defaults to left
im = Image.new(mode='RGB', size=(300, 100))
draw = ImageDraw.Draw(im)
draw.text((0, 0), TEST_TEXT, font=ttf)
target = 'Tests/images/multiline_text.png'
target_img = Image.open(target)
# Epsilon ~.5 fails with FreeType 2.7
self.assert_image_similar(im, target_img, self.metrics['multiline'])
# Test that text() can pass on additional arguments
# to multiline_text()
draw.text((0, 0), TEST_TEXT, fill=None, font=ttf, anchor=None,
spacing=4, align="left")
draw.text((0, 0), TEST_TEXT, None, ttf, None, 4, "left")
# Test align center and right
for align, ext in {"center": "_center",
"right": "_right"}.items():
im = Image.new(mode='RGB', size=(300, 100))
draw = ImageDraw.Draw(im)
draw.multiline_text((0, 0), TEST_TEXT, font=ttf, align=align)
target = 'Tests/images/multiline_text'+ext+'.png'
target_img = Image.open(target)
# Epsilon ~.5 fails with FreeType 2.7
self.assert_image_similar(im, target_img,
self.metrics['multiline'])
def test_unknown_align(self):
im = Image.new(mode='RGB', size=(300, 100))
draw = ImageDraw.Draw(im)
ttf = self.get_font()
# Act/Assert
self.assertRaises(
ValueError,
draw.multiline_text, (0, 0), TEST_TEXT, font=ttf, align="unknown")
def test_draw_align(self):
im = Image.new('RGB', (300, 100), 'white')
draw = ImageDraw.Draw(im)
ttf = self.get_font()
line = "some text"
draw.text((100, 40), line, (0, 0, 0), font=ttf, align='left')
def test_multiline_size(self):
ttf = self.get_font()
im = Image.new(mode='RGB', size=(300, 100))
draw = ImageDraw.Draw(im)
# Test that textsize() correctly connects to multiline_textsize()
self.assertEqual(draw.textsize(TEST_TEXT, font=ttf),
draw.multiline_textsize(TEST_TEXT, font=ttf))
# Test that multiline_textsize corresponds to ImageFont.textsize()
# for single line text
self.assertEqual(ttf.getsize('A'),
draw.multiline_textsize('A', font=ttf))
# Test that textsize() can pass on additional arguments
# to multiline_textsize()
draw.textsize(TEST_TEXT, font=ttf, spacing=4)
draw.textsize(TEST_TEXT, ttf, 4)
def test_multiline_width(self):
ttf = self.get_font()
im = Image.new(mode='RGB', size=(300, 100))
draw = ImageDraw.Draw(im)
self.assertEqual(draw.textsize("longest line", font=ttf)[0],
draw.multiline_textsize("longest line\nline",
font=ttf)[0])
def test_multiline_spacing(self):
ttf = self.get_font()
im = Image.new(mode='RGB', size=(300, 100))
draw = ImageDraw.Draw(im)
draw.multiline_text((0, 0), TEST_TEXT, font=ttf, spacing=10)
target = 'Tests/images/multiline_text_spacing.png'
target_img = Image.open(target)
# Epsilon ~.5 fails with FreeType 2.7
self.assert_image_similar(im, target_img, self.metrics['multiline'])
def test_rotated_transposed_font(self):
img_grey = Image.new("L", (100, 100))
draw = ImageDraw.Draw(img_grey)
word = "testing"
font = self.get_font()
orientation = Image.ROTATE_90
transposed_font = ImageFont.TransposedFont(
font, orientation=orientation)
# Original font
draw.font = font
box_size_a = draw.textsize(word)
# Rotated font
draw.font = transposed_font
box_size_b = draw.textsize(word)
# Check (w,h) of box a is (h,w) of box b
self.assertEqual(box_size_a[0], box_size_b[1])
self.assertEqual(box_size_a[1], box_size_b[0])
def test_unrotated_transposed_font(self):
img_grey = Image.new("L", (100, 100))
draw = ImageDraw.Draw(img_grey)
word = "testing"
font = self.get_font()
orientation = None
transposed_font = ImageFont.TransposedFont(
font, orientation=orientation)
# Original font
draw.font = font
box_size_a = draw.textsize(word)
# Rotated font
draw.font = transposed_font
box_size_b = draw.textsize(word)
# Check boxes a and b are same size
self.assertEqual(box_size_a, box_size_b)
def test_rotated_transposed_font_get_mask(self):
# Arrange
text = "mask this"
font = self.get_font()
orientation = Image.ROTATE_90
transposed_font = ImageFont.TransposedFont(
font, orientation=orientation)
# Act
mask = transposed_font.getmask(text)
# Assert
self.assertEqual(mask.size, (13, 108))
def test_unrotated_transposed_font_get_mask(self):
# Arrange
text = "mask this"
font = self.get_font()
orientation = None
transposed_font = ImageFont.TransposedFont(
font, orientation=orientation)
# Act
mask = transposed_font.getmask(text)
# Assert
self.assertEqual(mask.size, (108, 13))
def test_free_type_font_get_name(self):
# Arrange
font = self.get_font()
# Act
name = font.getname()
# Assert
self.assertEqual(('FreeMono', 'Regular'), name)
def test_free_type_font_get_metrics(self):
# Arrange
font = self.get_font()
# Act
ascent, descent = font.getmetrics()
# Assert
self.assertIsInstance(ascent, int)
self.assertIsInstance(descent, int)
self.assertEqual((ascent, descent), (16, 4)) # too exact check?
def test_free_type_font_get_offset(self):
# Arrange
font = self.get_font()
text = "offset this"
# Act
offset = font.getoffset(text)
# Assert
self.assertEqual(offset, (0, 3))
def test_free_type_font_get_mask(self):
# Arrange
font = self.get_font()
text = "mask this"
# Act
mask = font.getmask(text)
# Assert
self.assertEqual(mask.size, (108, 13))
def test_load_path_not_found(self):
# Arrange
filename = "somefilenamethatdoesntexist.ttf"
# Act/Assert
self.assertRaises(IOError, ImageFont.load_path, filename)
def test_default_font(self):
# Arrange
txt = 'This is a "better than nothing" default font.'
im = Image.new(mode='RGB', size=(300, 100))
draw = ImageDraw.Draw(im)
target = 'Tests/images/default_font.png'
target_img = Image.open(target)
# Act
default_font = ImageFont.load_default()
draw.text((10, 10), txt, font=default_font)
# Assert
self.assert_image_equal(im, target_img)
def test_getsize_empty(self):
# issue #2614
font = self.get_font()
# should not crash.
self.assertEqual((0, 0), font.getsize(''))
def test_render_empty(self):
# issue 2666
font = self.get_font()
im = Image.new(mode='RGB', size=(300, 100))
target = im.copy()
draw = ImageDraw.Draw(im)
# should not crash here.
draw.text((10, 10), '', font=font)
self.assert_image_equal(im, target)
def test_unicode_pilfont(self):
# should not segfault, should return UnicodeDecodeError
# issue #2826
font = ImageFont.load_default()
with self.assertRaises(UnicodeEncodeError):
font.getsize(u"’")
def _test_fake_loading_font(self, path_to_fake, fontname):
# Make a copy of FreeTypeFont so we can patch the original
free_type_font = copy.deepcopy(ImageFont.FreeTypeFont)
with SimplePatcher(ImageFont, '_FreeTypeFont', free_type_font):
def loadable_font(filepath, size, index, encoding,
*args, **kwargs):
if filepath == path_to_fake:
return ImageFont._FreeTypeFont(FONT_PATH, size, index,
encoding, *args, **kwargs)
return ImageFont._FreeTypeFont(filepath, size, index,
encoding, *args, **kwargs)
with SimplePatcher(ImageFont, 'FreeTypeFont', loadable_font):
font = ImageFont.truetype(fontname)
# Make sure it's loaded
name = font.getname()
self.assertEqual(('FreeMono', 'Regular'), name)
@unittest.skipIf(sys.platform.startswith('win32'),
"requires Unix or macOS")
def test_find_linux_font(self):
# A lot of mocking here - this is more for hitting code and
# catching syntax like errors
font_directory = '/usr/local/share/fonts'
with SimplePatcher(sys, 'platform', 'linux'):
patched_env = copy.deepcopy(os.environ)
patched_env['XDG_DATA_DIRS'] = '/usr/share/:/usr/local/share/'
with SimplePatcher(os, 'environ', patched_env):
def fake_walker(path):
if path == font_directory:
return [(path, [], [
'Arial.ttf', 'Single.otf', 'Duplicate.otf',
'Duplicate.ttf'], )]
return [(path, [], ['some_random_font.ttf'], )]
with SimplePatcher(os, 'walk', fake_walker):
# Test that the font loads both with and without the
# extension
self._test_fake_loading_font(
font_directory+'/Arial.ttf', 'Arial.ttf')
self._test_fake_loading_font(
font_directory+'/Arial.ttf', 'Arial')
# Test that non-ttf fonts can be found without the
# extension
self._test_fake_loading_font(
font_directory+'/Single.otf', 'Single')
# Test that ttf fonts are preferred if the extension is
# not specified
self._test_fake_loading_font(
font_directory+'/Duplicate.ttf', 'Duplicate')
@unittest.skipIf(sys.platform.startswith('win32'),
"requires Unix or macOS")
def test_find_macos_font(self):
# Like the linux test, more cover hitting code rather than testing
# correctness.
font_directory = '/System/Library/Fonts'
with SimplePatcher(sys, 'platform', 'darwin'):
def fake_walker(path):
if path == font_directory:
return [(path, [],
['Arial.ttf', 'Single.otf',
'Duplicate.otf', 'Duplicate.ttf'], )]
return [(path, [], ['some_random_font.ttf'], )]
with SimplePatcher(os, 'walk', fake_walker):
self._test_fake_loading_font(
font_directory+'/Arial.ttf', 'Arial.ttf')
self._test_fake_loading_font(
font_directory+'/Arial.ttf', 'Arial')
self._test_fake_loading_font(
font_directory+'/Single.otf', 'Single')
self._test_fake_loading_font(
font_directory+'/Duplicate.ttf', 'Duplicate')
def test_imagefont_getters(self):
# Arrange
t = self.get_font()
# Act / Assert
self.assertEqual(t.getmetrics(), (16, 4))
self.assertEqual(t.font.ascent, 16)
self.assertEqual(t.font.descent, 4)
self.assertEqual(t.font.height, 20)
self.assertEqual(t.font.x_ppem, 20)
self.assertEqual(t.font.y_ppem, 20)
self.assertEqual(t.font.glyphs, 4177)
self.assertEqual(t.getsize('A'), (12, 16))
self.assertEqual(t.getsize('AB'), (24, 16))
self.assertEqual(t.getsize('M'), self.metrics['getters'])
self.assertEqual(t.getsize('y'), (12, 20))
self.assertEqual(t.getsize('a'), (12, 16))
self.assertEqual(t.getsize_multiline('A'), (12, 16))
self.assertEqual(t.getsize_multiline('AB'), (24, 16))
self.assertEqual(t.getsize_multiline('a'), (12, 16))
self.assertEqual(t.getsize_multiline('ABC\n'), (36, 36))
self.assertEqual(t.getsize_multiline('ABC\nA'), (36, 36))
self.assertEqual(t.getsize_multiline('ABC\nAaaa'), (48, 36))
@unittest.skipUnless(HAS_RAQM, "Raqm not Available")
class TestImageFont_RaqmLayout(TestImageFont):
LAYOUT_ENGINE = ImageFont.LAYOUT_RAQM
if __name__ == '__main__':
unittest.main()
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