Pillow/Tests/test_file_bmp.py
2022-06-20 21:01:10 +10:00

177 lines
5.1 KiB
Python

import io
import pytest
from PIL import BmpImagePlugin, Image
from .helper import (
assert_image_equal,
assert_image_equal_tofile,
assert_image_similar_tofile,
hopper,
)
def test_sanity(tmp_path):
def roundtrip(im):
outfile = str(tmp_path / "temp.bmp")
im.save(outfile, "BMP")
with Image.open(outfile) as reloaded:
reloaded.load()
assert im.mode == reloaded.mode
assert im.size == reloaded.size
assert reloaded.format == "BMP"
assert reloaded.get_format_mimetype() == "image/bmp"
roundtrip(hopper())
roundtrip(hopper("1"))
roundtrip(hopper("L"))
roundtrip(hopper("P"))
roundtrip(hopper("RGB"))
def test_invalid_file():
with open("Tests/images/flower.jpg", "rb") as fp:
with pytest.raises(SyntaxError):
BmpImagePlugin.BmpImageFile(fp)
def test_save_to_bytes():
output = io.BytesIO()
im = hopper()
im.save(output, "BMP")
output.seek(0)
with Image.open(output) as reloaded:
assert im.mode == reloaded.mode
assert im.size == reloaded.size
assert reloaded.format == "BMP"
def test_save_too_large(tmp_path):
outfile = str(tmp_path / "temp.bmp")
with Image.new("RGB", (1, 1)) as im:
im._size = (37838, 37838)
with pytest.raises(ValueError):
im.save(outfile)
def test_dpi():
dpi = (72, 72)
output = io.BytesIO()
with hopper() as im:
im.save(output, "BMP", dpi=dpi)
output.seek(0)
with Image.open(output) as reloaded:
assert reloaded.info["dpi"] == (72.008961115161, 72.008961115161)
def test_save_bmp_with_dpi(tmp_path):
# Test for #1301
# Arrange
outfile = str(tmp_path / "temp.jpg")
with Image.open("Tests/images/hopper.bmp") as im:
assert im.info["dpi"] == (95.98654816726399, 95.98654816726399)
# Act
im.save(outfile, "JPEG", dpi=im.info["dpi"])
# Assert
with Image.open(outfile) as reloaded:
reloaded.load()
assert reloaded.info["dpi"] == (96, 96)
assert reloaded.size == im.size
assert reloaded.format == "JPEG"
def test_save_float_dpi(tmp_path):
outfile = str(tmp_path / "temp.bmp")
with Image.open("Tests/images/hopper.bmp") as im:
im.save(outfile, dpi=(72.21216100543306, 72.21216100543306))
with Image.open(outfile) as reloaded:
assert reloaded.info["dpi"] == (72.21216100543306, 72.21216100543306)
def test_load_dib():
# test for #1293, Imagegrab returning Unsupported Bitfields Format
with Image.open("Tests/images/clipboard.dib") as im:
assert im.format == "DIB"
assert im.get_format_mimetype() == "image/bmp"
assert_image_equal_tofile(im, "Tests/images/clipboard_target.png")
def test_save_dib(tmp_path):
outfile = str(tmp_path / "temp.dib")
with Image.open("Tests/images/clipboard.dib") as im:
im.save(outfile)
with Image.open(outfile) as reloaded:
assert reloaded.format == "DIB"
assert reloaded.get_format_mimetype() == "image/bmp"
assert_image_equal(im, reloaded)
def test_rgba_bitfields():
# This test image has been manually hexedited
# to change the bitfield compression in the header from XBGR to RGBA
with Image.open("Tests/images/rgb32bf-rgba.bmp") as im:
# So before the comparing the image, swap the channels
b, g, r = im.split()[1:]
im = Image.merge("RGB", (r, g, b))
assert_image_equal_tofile(im, "Tests/images/bmp/q/rgb32bf-xbgr.bmp")
def test_rle8():
with Image.open("Tests/images/hopper_rle8.bmp") as im:
assert_image_similar_tofile(im.convert("RGB"), "Tests/images/hopper.bmp", 12)
with Image.open("Tests/images/hopper_rle8_greyscale.bmp") as im:
assert_image_equal_tofile(im, "Tests/images/bw_gradient.png")
# This test image has been manually hexedited
# to have rows with too much data
with Image.open("Tests/images/hopper_rle8_row_overflow.bmp") as im:
assert_image_similar_tofile(im.convert("RGB"), "Tests/images/hopper.bmp", 12)
# Signal end of bitmap before the image is finished
with open("Tests/images/bmp/g/pal8rle.bmp", "rb") as fp:
data = fp.read(1063) + b"\x01"
with Image.open(io.BytesIO(data)) as im:
with pytest.raises(ValueError):
im.load()
@pytest.mark.parametrize(
"file_name,length",
(
# EOF immediately after the header
("Tests/images/hopper_rle8.bmp", 1078),
# EOF during delta
("Tests/images/bmp/q/pal8rletrns.bmp", 3670),
# EOF when reading data in absolute mode
("Tests/images/bmp/g/pal8rle.bmp", 1064),
),
)
def test_rle8_eof(file_name, length):
with open(file_name, "rb") as fp:
data = fp.read(length)
with Image.open(io.BytesIO(data)) as im:
with pytest.raises(ValueError):
im.load()
def test_offset():
# This image has been hexedited
# to exclude the palette size from the pixel data offset
with Image.open("Tests/images/pal8_offset.bmp") as im:
assert_image_equal_tofile(im, "Tests/images/bmp/g/pal8.bmp")