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Test ImageFont.ImageFont, in case freetype2 is not supported

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This commit is contained in:
Andrew Murray 2025-11-03 23:07:15 +11:00
parent e36e67081a
commit b3d9bd9950
1 changed files with 51 additions and 24 deletions
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75
Tests/test_imagetext.py
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@ -2,7 +2,7 @@ from __future__ import annotations
import pytest import pytest
from PIL import Image, ImageDraw, ImageFont, ImageText from PIL import Image, ImageDraw, ImageFont, ImageText, features
from .helper import assert_image_similar_tofile, skip_unless_feature from .helper import assert_image_similar_tofile, skip_unless_feature
@ -20,42 +20,69 @@ def layout_engine(request: pytest.FixtureRequest) -> ImageFont.Layout:
return request.param return request.param
@pytest.fixture(scope="module") @pytest.fixture(
def font(layout_engine: ImageFont.Layout) -> ImageFont.FreeTypeFont: scope="module",
return ImageFont.truetype(FONT_PATH, 20, layout_engine=layout_engine) params=[
None,
pytest.param(ImageFont.Layout.BASIC, marks=skip_unless_feature("freetype2")),
pytest.param(ImageFont.Layout.RAQM, marks=skip_unless_feature("raqm")),
],
)
def font(
request: pytest.FixtureRequest,
) -> ImageFont.ImageFont | ImageFont.FreeTypeFont:
layout_engine = request.param
if layout_engine is None:
return ImageFont.load_default_imagefont()
else:
return ImageFont.truetype(FONT_PATH, 20, layout_engine=layout_engine)
def test_get_length(font: ImageFont.FreeTypeFont) -> None: def test_get_length(font: ImageFont.ImageFont | ImageFont.FreeTypeFont) -> None:
assert ImageText.Text("A", font).get_length() == 12 factor = 1 if isinstance(font, ImageFont.ImageFont) else 2
assert ImageText.Text("AB", font).get_length() == 24 assert ImageText.Text("A", font).get_length() == 6 * factor
assert ImageText.Text("M", font).get_length() == 12 assert ImageText.Text("AB", font).get_length() == 12 * factor
assert ImageText.Text("y", font).get_length() == 12 assert ImageText.Text("M", font).get_length() == 6 * factor
assert ImageText.Text("a", font).get_length() == 12 assert ImageText.Text("y", font).get_length() == 6 * factor
assert ImageText.Text("a", font).get_length() == 6 * factor
text = ImageText.Text("\n", font) text = ImageText.Text("\n", font)
with pytest.raises(ValueError, match="can't measure length of multiline text"): with pytest.raises(ValueError, match="can't measure length of multiline text"):
text.get_length() text.get_length()
def test_get_bbox(font: ImageFont.FreeTypeFont) -> None: @pytest.mark.parametrize(
assert ImageText.Text("A", font).get_bbox() == (0, 4, 12, 16) "text, expected",
assert ImageText.Text("AB", font).get_bbox() == (0, 4, 24, 16) (
assert ImageText.Text("M", font).get_bbox() == (0, 4, 12, 16) ("A", (0, 4, 12, 16)),
assert ImageText.Text("y", font).get_bbox() == (0, 7, 12, 20) ("AB", (0, 4, 24, 16)),
assert ImageText.Text("a", font).get_bbox() == (0, 7, 12, 16) ("M", (0, 4, 12, 16)),
("y", (0, 7, 12, 20)),
("a", (0, 7, 12, 16)),
),
)
def test_get_bbox(
font: ImageFont.ImageFont | ImageFont.FreeTypeFont,
text: str,
expected: tuple[int, int, int, int],
) -> None:
if isinstance(font, ImageFont.ImageFont):
expected = (0, 0, expected[2] // 2, 11)
assert ImageText.Text(text, font).get_bbox() == expected
def test_standard_embedded_color(layout_engine: ImageFont.Layout) -> None: def test_standard_embedded_color(layout_engine: ImageFont.Layout) -> None:
font = ImageFont.truetype(FONT_PATH, 40, layout_engine=layout_engine) if features.check_module("freetype2"):
text = ImageText.Text("Hello World!", font) font = ImageFont.truetype(FONT_PATH, 40, layout_engine=layout_engine)
text.embed_color() text = ImageText.Text("Hello World!", font)
assert text.get_length() == 288 text.embed_color()
assert text.get_length() == 288
im = Image.new("RGB", (300, 64), "white") im = Image.new("RGB", (300, 64), "white")
draw = ImageDraw.Draw(im) draw = ImageDraw.Draw(im)
draw.text((10, 10), text, "#fa6") draw.text((10, 10), text, "#fa6")
assert_image_similar_tofile(im, "Tests/images/standard_embedded.png", 3.1) assert_image_similar_tofile(im, "Tests/images/standard_embedded.png", 3.1)
text = ImageText.Text("", mode="1") text = ImageText.Text("", mode="1")
with pytest.raises( with pytest.raises(