Pillow/Tests/test_imagefont_bitmap.py

import pytest
from PIL import Image, ImageDraw, ImageFont

from .helper import assert_image_similar

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)

    # 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, 20)