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test_imagefont.py
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test_imagefont.py
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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
import re
import shutil
import distutils.version
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", "<2.4"): {"multiline": 30, "textsize": 12, "getters": (13, 16)},
(">=2.7", "<2.10"): {"multiline": 6.2, "textsize": 2.5, "getters": (12, 16)},
(">=2.10",): {"multiline": 14.8, "textsize": 2.5, "getters": (12, 16)},
"Default": {"multiline": 0.5, "textsize": 0.5, "getters": (12, 16)},
}
def setUp(self):
freetype = distutils.version.StrictVersion(ImageFont.core.freetype2_version)
self.metrics = self.METRICS["Default"]
for conditions, metrics in self.METRICS.items():
if not isinstance(conditions, tuple):
continue
for condition in conditions:
version = re.sub("[<=>]", "", condition)
if (condition.startswith(">=") and freetype >= version) or (
condition.startswith("<") and freetype < version
):
# Condition was met
continue
# Condition failed
break
else:
# All conditions were met
self.metrics = metrics
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 test_non_unicode_path(self):
try:
tempfile = self.tempfile("temp_" + chr(128) + ".ttf")
except UnicodeEncodeError:
self.skipTest("Unicode path could not be created")
shutil.copy(FONT_PATH, tempfile)
ImageFont.truetype(tempfile, FONT_SIZE)
def test_unavailable_layout_engine(self):
have_raqm = ImageFont.core.HAVE_RAQM
ImageFont.core.HAVE_RAQM = False
try:
ttf = ImageFont.truetype(
FONT_PATH, FONT_SIZE, layout_engine=ImageFont.LAYOUT_RAQM
)
finally:
ImageFont.core.HAVE_RAQM = have_raqm
self.assertEqual(ttf.layout_engine, ImageFont.LAYOUT_BASIC)
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)
self.assertRaises(IOError, ImageFont.truetype, filename)
def test_load_non_font_bytes(self):
with open("Tests/images/hopper.jpg", "rb") as f:
self.assertRaises(IOError, ImageFont.truetype, f)
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"’")
@unittest.skipIf(
sys.platform.startswith("win32") and sys.version.startswith("2"),
"requires Python 3.x on Windows",
)
def test_unicode_extended(self):
# issue #3777
text = u"A\u278A\U0001F12B"
target = "Tests/images/unicode_extended.png"
ttf = ImageFont.truetype(
"Tests/fonts/NotoSansSymbols-Regular.ttf",
FONT_SIZE,
layout_engine=self.LAYOUT_ENGINE,
)
img = Image.new("RGB", (100, 60))
d = ImageDraw.Draw(img)
d.text((10, 10), text, font=ttf)
self.assert_image_similar_tofile(img, target, self.metrics["multiline"])
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))
def test_complex_font_settings(self):
# Arrange
t = self.get_font()
# Act / Assert
if t.layout_engine == ImageFont.LAYOUT_BASIC:
self.assertRaises(KeyError, t.getmask, "абвг", direction="rtl")
self.assertRaises(KeyError, t.getmask, "абвг", features=["-kern"])
self.assertRaises(KeyError, t.getmask, "абвг", language="sr")
def test_variation_get(self):
font = self.get_font()
freetype = distutils.version.StrictVersion(ImageFont.core.freetype2_version)
if freetype < "2.9.1":
self.assertRaises(NotImplementedError, font.get_variation_names)
self.assertRaises(NotImplementedError, font.get_variation_axes)
return
self.assertRaises(IOError, font.get_variation_names)
self.assertRaises(IOError, font.get_variation_axes)
font = ImageFont.truetype("Tests/fonts/AdobeVFPrototype.ttf")
self.assertEqual(
font.get_variation_names(),
[
b"ExtraLight",
b"Light",
b"Regular",
b"Semibold",
b"Bold",
b"Black",
b"Black Medium Contrast",
b"Black High Contrast",
b"Default",
],
)
self.assertEqual(
font.get_variation_axes(),
[
{"name": b"Weight", "minimum": 200, "maximum": 900, "default": 389},
{"name": b"Contrast", "minimum": 0, "maximum": 100, "default": 0},
],
)
font = ImageFont.truetype("Tests/fonts/TINY5x3GX.ttf")
self.assertEqual(
font.get_variation_names(),
[
b"20",
b"40",
b"60",
b"80",
b"100",
b"120",
b"140",
b"160",
b"180",
b"200",
b"220",
b"240",
b"260",
b"280",
b"300",
b"Regular",
],
)
self.assertEqual(
font.get_variation_axes(),
[{"name": b"Size", "minimum": 0, "maximum": 300, "default": 0}],
)
def test_variation_set_by_name(self):
font = self.get_font()
freetype = distutils.version.StrictVersion(ImageFont.core.freetype2_version)
if freetype < "2.9.1":
self.assertRaises(NotImplementedError, font.set_variation_by_name, "Bold")
return
self.assertRaises(IOError, font.set_variation_by_name, "Bold")
def _check_text(font, path, epsilon):
im = Image.new("RGB", (100, 75), "white")
d = ImageDraw.Draw(im)
d.text((10, 10), "Text", font=font, fill="black")
expected = Image.open(path)
self.assert_image_similar(im, expected, epsilon)
font = ImageFont.truetype("Tests/fonts/AdobeVFPrototype.ttf", 36)
_check_text(font, "Tests/images/variation_adobe.png", 11)
for name in ["Bold", b"Bold"]:
font.set_variation_by_name(name)
_check_text(font, "Tests/images/variation_adobe_name.png", 11)
font = ImageFont.truetype("Tests/fonts/TINY5x3GX.ttf", 36)
_check_text(font, "Tests/images/variation_tiny.png", 40)
for name in ["200", b"200"]:
font.set_variation_by_name(name)
_check_text(font, "Tests/images/variation_tiny_name.png", 40)
def test_variation_set_by_axes(self):
font = self.get_font()
freetype = distutils.version.StrictVersion(ImageFont.core.freetype2_version)
if freetype < "2.9.1":
self.assertRaises(NotImplementedError, font.set_variation_by_axes, [100])
return
self.assertRaises(IOError, font.set_variation_by_axes, [500, 50])
def _check_text(font, path, epsilon):
im = Image.new("RGB", (100, 75), "white")
d = ImageDraw.Draw(im)
d.text((10, 10), "Text", font=font, fill="black")
expected = Image.open(path)
self.assert_image_similar(im, expected, epsilon)
font = ImageFont.truetype("Tests/fonts/AdobeVFPrototype.ttf", 36)
font.set_variation_by_axes([500, 50])
_check_text(font, "Tests/images/variation_adobe_axes.png", 5.1)
font = ImageFont.truetype("Tests/fonts/TINY5x3GX.ttf", 36)
font.set_variation_by_axes([100])
_check_text(font, "Tests/images/variation_tiny_axes.png", 32.5)
@unittest.skipUnless(HAS_RAQM, "Raqm not Available")
class TestImageFont_RaqmLayout(TestImageFont):
LAYOUT_ENGINE = ImageFont.LAYOUT_RAQM