Pillow/Tests/test_imagefont_bitmap.py

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)