Pillow/Tests/test_imagefont_bitmap.py

from PIL import Image, ImageDraw, ImageFont

from .helper import PillowTestCase, unittest

image_font_installed = True
try:
    ImageFont.core.getfont
except ImportError:
    image_font_installed = False


@unittest.skipIf(not image_font_installed, "image font not installed")
class TestImageFontBitmap(PillowTestCase):
    def test_similar(self):
        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,
        )
        self.assert_image_similar(im_bitmap, im_outline, 20)