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test_file_ppm.py
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test_file_ppm.py
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import sys
from io import BytesIO
import pytest
from PIL import Image, UnidentifiedImageError
from .helper import assert_image_equal_tofile, assert_image_similar, hopper
# sample ppm stream
TEST_FILE = "Tests/images/hopper.ppm"
def test_sanity():
with Image.open(TEST_FILE) as im:
assert im.mode == "RGB"
assert im.size == (128, 128)
assert im.format == "PPM"
assert im.get_format_mimetype() == "image/x-portable-pixmap"
def test_arbitrary_maxval():
# P5 L mode
fp = BytesIO(b"P5 3 1 4 \x00\x02\x04")
with Image.open(fp) as im:
assert im.size == (3, 1)
assert im.mode == "L"
px = im.load()
assert tuple(px[x, 0] for x in range(3)) == (0, 128, 255)
# P6 with maxval < 255
fp = BytesIO(b"P6 3 1 17 \x00\x01\x02\x08\x09\x0A\x0F\x10\x11")
with Image.open(fp) as im:
assert im.size == (3, 1)
assert im.mode == "RGB"
px = im.load()
assert tuple(px[x, 0] for x in range(3)) == (
(0, 15, 30),
(120, 135, 150),
(225, 240, 255),
)
# P6 with maxval > 255
fp = BytesIO(
b"P6 3 1 257 \x00\x00\x00\x01\x00\x02"
b"\x00\x80\x00\x81\x00\x82\x01\x00\x01\x01\xFF\xFF"
)
with Image.open(fp) as im:
assert im.size == (3, 1)
assert im.mode == "RGB"
px = im.load()
assert tuple(px[x, 0] for x in range(3)) == (
(0, 1, 2),
(127, 128, 129),
(254, 255, 255),
)
def test_16bit_pgm():
with Image.open("Tests/images/16_bit_binary.pgm") as im:
assert im.mode == "I"
assert im.size == (20, 100)
assert im.get_format_mimetype() == "image/x-portable-graymap"
assert_image_equal_tofile(im, "Tests/images/16_bit_binary_pgm.png")
def test_16bit_pgm_write(tmp_path):
with Image.open("Tests/images/16_bit_binary.pgm") as im:
f = str(tmp_path / "temp.pgm")
im.save(f, "PPM")
assert_image_equal_tofile(im, f)
def test_pnm(tmp_path):
with Image.open("Tests/images/hopper.pnm") as im:
assert_image_similar(im, hopper(), 0.0001)
f = str(tmp_path / "temp.pnm")
im.save(f)
assert_image_equal_tofile(im, f)
def test_magic(tmp_path):
path = str(tmp_path / "temp.ppm")
with open(path, "wb") as f:
f.write(b"PyInvalid")
with pytest.raises(UnidentifiedImageError):
with Image.open(path):
pass
def test_header_with_comments(tmp_path):
path = str(tmp_path / "temp.ppm")
with open(path, "wb") as f:
f.write(b"P6 #comment\n#comment\r12#comment\r8\n128 #comment\n255\n")
with Image.open(path) as im:
assert im.size == (128, 128)
def test_non_integer_token(tmp_path):
path = str(tmp_path / "temp.ppm")
with open(path, "wb") as f:
f.write(b"P6\nTEST")
with pytest.raises(ValueError):
with Image.open(path):
pass
def test_token_too_long(tmp_path):
path = str(tmp_path / "temp.ppm")
with open(path, "wb") as f:
f.write(b"P6\n 01234567890")
with pytest.raises(ValueError) as e:
with Image.open(path):
pass
assert str(e.value) == "Token too long in file header: b'01234567890'"
def test_truncated_file(tmp_path):
# Test EOF in header
path = str(tmp_path / "temp.pgm")
with open(path, "w") as f:
f.write("P6")
with pytest.raises(ValueError) as e:
with Image.open(path):
pass
assert str(e.value) == "Reached EOF while reading header"
# Test EOF for PyDecoder
fp = BytesIO(b"P5 3 1 4")
with Image.open(fp) as im:
with pytest.raises(ValueError):
im.load()
def test_neg_ppm():
# Storage.c accepted negative values for xsize, ysize. the
# internal open_ppm function didn't check for sanity but it
# has been removed. The default opener doesn't accept negative
# sizes.
with pytest.raises(OSError):
with Image.open("Tests/images/negative_size.ppm"):
pass
def test_mimetypes(tmp_path):
path = str(tmp_path / "temp.pgm")
with open(path, "w") as f:
f.write("P4\n128 128\n255")
with Image.open(path) as im:
assert im.get_format_mimetype() == "image/x-portable-bitmap"
with open(path, "w") as f:
f.write("PyCMYK\n128 128\n255")
with Image.open(path) as im:
assert im.get_format_mimetype() == "image/x-portable-anymap"
@pytest.mark.parametrize("buffer", (True, False))
def test_save_stdout(buffer):
old_stdout = sys.stdout
if buffer:
class MyStdOut:
buffer = BytesIO()
mystdout = MyStdOut()
else:
mystdout = BytesIO()
sys.stdout = mystdout
with Image.open(TEST_FILE) as im:
im.save(sys.stdout, "PPM")
# Reset stdout
sys.stdout = old_stdout
if buffer:
mystdout = mystdout.buffer
with Image.open(mystdout) as reloaded:
assert_image_equal_tofile(reloaded, TEST_FILE)