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)}, '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.assertRegexpMatches( 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, lambda: _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])) del draw 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") del draw # 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) del draw 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(AssertionError, lambda: draw.multiline_text((0, 0), TEST_TEXT, font=ttf, align="unknown")) 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 textsize() can pass on additional arguments # to multiline_textsize() draw.textsize(TEST_TEXT, font=ttf, spacing=4) draw.textsize(TEST_TEXT, ttf, 4) del draw 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]) del draw 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) del draw target = 'Tests/images/multiline_text_spacing.png' target_img = Image.open(target) from PIL import ImageChops ImageChops.difference(im, target_img).save('multiline.png') # 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) del draw # 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) del draw # 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, lambda: 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) del draw # Assert self.assert_image_equal(im, target_img) 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)) @unittest.skipUnless(HAS_RAQM, "Raqm not Available") class TestImageFont_RaqmLayout(TestImageFont): LAYOUT_ENGINE = ImageFont.LAYOUT_RAQM if __name__ == '__main__': unittest.main()