Pillow/Tests/test_imagefont_bitmap.py

62 lines
2.0 KiB
Python

import pytest
from PIL import Image, ImageDraw, ImageFont
from .helper import assert_image_equal_tofile, assert_image_similar, skip_unless_feature
image_font_installed = True
try:
ImageFont.core.getfont
except ImportError:
image_font_installed = False
@pytest.mark.skipif(not image_font_installed, reason="Image font not installed")
def test_similar():
text = "EmbeddedBitmap"
font_outline = ImageFont.truetype(font="Tests/fonts/DejaVuSans.ttf", size=24)
font_bitmap = ImageFont.truetype(font="Tests/fonts/DejaVuSans-bitmap.ttf", size=24)
size_outline = font_outline.getsize(text)
size_bitmap = font_bitmap.getsize(text)
size_final = (
max(size_outline[0], size_bitmap[0]),
max(size_outline[1], size_bitmap[1]),
)
im_bitmap = Image.new("RGB", size_final, (255, 255, 255))
im_outline = im_bitmap.copy()
draw_bitmap = ImageDraw.Draw(im_bitmap)
draw_outline = ImageDraw.Draw(im_outline)
draw_outline.fontmode = "1" # disable anti-aliasing to match bitmap font
# Metrics are different on the bitmap and TTF fonts,
# more so on some platforms and versions of FreeType than others.
# Mac has a 1px difference, Linux doesn't.
draw_bitmap.text(
(0, size_final[1] - size_bitmap[1]), text, fill=(0, 0, 0), font=font_bitmap
)
draw_outline.text(
(0, size_final[1] - size_outline[1]),
text,
fill=(0, 0, 0),
font=font_outline,
)
assert_image_similar(im_bitmap, im_outline, 4)
@skip_unless_feature("freetype2")
@pytest.mark.parametrize("bpp", (1, 2, 4, 8))
def test_bitmap_font(bpp):
text = "Bitmap Font"
target = f"Tests/images/bitmap_font_{bpp}.png"
font = ImageFont.truetype(
f"Tests/fonts/DejaVuSans-24-{bpp}-stripped.ttf",
24,
layout_engine=ImageFont.LAYOUT_BASIC,
)
im = Image.new("RGB", (160, 35), "white")
draw = ImageDraw.Draw(im)
draw.text((2, 2), text, "black", font)
assert_image_equal_tofile(im, target)