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Pillow/Tests/test_image_access.py
Hugo van Kemenade 53c3cd9f8e isort Tests
2024-01-20 13:23:03 +02:00

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from __future__ import annotations
import os
import subprocess
import sys
import sysconfig
import pytest
from PIL import Image
from .helper import assert_image_equal, hopper, is_win32
# CFFI imports pycparser which doesn't support PYTHONOPTIMIZE=2
# https://github.com/eliben/pycparser/pull/198#issuecomment-317001670
if os.environ.get("PYTHONOPTIMIZE") == "2":
cffi = None
else:
try:
import cffi
from PIL import PyAccess
except ImportError:
cffi = None
try:
import numpy
except ImportError:
numpy = None
class AccessTest:
# initial value
_init_cffi_access = Image.USE_CFFI_ACCESS
_need_cffi_access = False
@classmethod
def setup_class(cls):
Image.USE_CFFI_ACCESS = cls._need_cffi_access
@classmethod
def teardown_class(cls):
Image.USE_CFFI_ACCESS = cls._init_cffi_access
class TestImagePutPixel(AccessTest):
def test_sanity(self):
im1 = hopper()
im2 = Image.new(im1.mode, im1.size, 0)
for y in range(im1.size[1]):
for x in range(im1.size[0]):
pos = x, y
im2.putpixel(pos, im1.getpixel(pos))
assert_image_equal(im1, im2)
im2 = Image.new(im1.mode, im1.size, 0)
im2.readonly = 1
for y in range(im1.size[1]):
for x in range(im1.size[0]):
pos = x, y
im2.putpixel(pos, im1.getpixel(pos))
assert not im2.readonly
assert_image_equal(im1, im2)
im2 = Image.new(im1.mode, im1.size, 0)
pix1 = im1.load()
pix2 = im2.load()
for x, y in ((0, "0"), ("0", 0)):
with pytest.raises(TypeError):
pix1[x, y]
for y in range(im1.size[1]):
for x in range(im1.size[0]):
pix2[x, y] = pix1[x, y]
assert_image_equal(im1, im2)
def test_sanity_negative_index(self):
im1 = hopper()
im2 = Image.new(im1.mode, im1.size, 0)
width, height = im1.size
assert im1.getpixel((0, 0)) == im1.getpixel((-width, -height))
assert im1.getpixel((-1, -1)) == im1.getpixel((width - 1, height - 1))
for y in range(-1, -im1.size[1] - 1, -1):
for x in range(-1, -im1.size[0] - 1, -1):
pos = x, y
im2.putpixel(pos, im1.getpixel(pos))
assert_image_equal(im1, im2)
im2 = Image.new(im1.mode, im1.size, 0)
im2.readonly = 1
for y in range(-1, -im1.size[1] - 1, -1):
for x in range(-1, -im1.size[0] - 1, -1):
pos = x, y
im2.putpixel(pos, im1.getpixel(pos))
assert not im2.readonly
assert_image_equal(im1, im2)
im2 = Image.new(im1.mode, im1.size, 0)
pix1 = im1.load()
pix2 = im2.load()
for y in range(-1, -im1.size[1] - 1, -1):
for x in range(-1, -im1.size[0] - 1, -1):
pix2[x, y] = pix1[x, y]
assert_image_equal(im1, im2)
@pytest.mark.skipif(numpy is None, reason="NumPy not installed")
def test_numpy(self):
im = hopper()
pix = im.load()
assert pix[numpy.int32(1), numpy.int32(2)] == (18, 20, 59)
class TestImageGetPixel(AccessTest):
@staticmethod
def color(mode):
bands = Image.getmodebands(mode)
if bands == 1:
return 1
if mode in ("BGR;15", "BGR;16"):
# These modes have less than 8 bits per band
# So (1, 2, 3) cannot be roundtripped
return (16, 32, 49)
return tuple(range(1, bands + 1))
def check(self, mode, expected_color=None):
if self._need_cffi_access and mode.startswith("BGR;"):
pytest.skip("Support not added to deprecated module for BGR;* modes")
if not expected_color:
expected_color = self.color(mode)
# check putpixel
im = Image.new(mode, (1, 1), None)
im.putpixel((0, 0), expected_color)
actual_color = im.getpixel((0, 0))
assert actual_color == expected_color, (
f"put/getpixel roundtrip failed for mode {mode}, "
f"expected {expected_color} got {actual_color}"
)
# check putpixel negative index
im.putpixel((-1, -1), expected_color)
actual_color = im.getpixel((-1, -1))
assert actual_color == expected_color, (
f"put/getpixel roundtrip negative index failed for mode {mode}, "
f"expected {expected_color} got {actual_color}"
)
# Check 0
im = Image.new(mode, (0, 0), None)
assert im.load() is not None
error = ValueError if self._need_cffi_access else IndexError
with pytest.raises(error):
im.putpixel((0, 0), expected_color)
with pytest.raises(error):
im.getpixel((0, 0))
# Check 0 negative index
with pytest.raises(error):
im.putpixel((-1, -1), expected_color)
with pytest.raises(error):
im.getpixel((-1, -1))
# check initial color
im = Image.new(mode, (1, 1), expected_color)
actual_color = im.getpixel((0, 0))
assert actual_color == expected_color, (
f"initial color failed for mode {mode}, "
f"expected {expected_color} got {actual_color}"
)
# check initial color negative index
actual_color = im.getpixel((-1, -1))
assert actual_color == expected_color, (
f"initial color failed with negative index for mode {mode}, "
f"expected {expected_color} got {actual_color}"
)
# Check 0
im = Image.new(mode, (0, 0), expected_color)
with pytest.raises(error):
im.getpixel((0, 0))
# Check 0 negative index
with pytest.raises(error):
im.getpixel((-1, -1))
@pytest.mark.parametrize(
"mode",
(
"1",
"L",
"LA",
"I",
"I;16",
"I;16B",
"F",
"P",
"PA",
"BGR;15",
"BGR;16",
"BGR;24",
"RGB",
"RGBA",
"RGBX",
"CMYK",
"YCbCr",
),
)
def test_basic(self, mode):
self.check(mode)
def test_list(self):
im = hopper()
assert im.getpixel([0, 0]) == (20, 20, 70)
@pytest.mark.parametrize("mode", ("I;16", "I;16B"))
@pytest.mark.parametrize(
"expected_color", (2**15 - 1, 2**15, 2**15 + 1, 2**16 - 1)
)
def test_signedness(self, mode, expected_color):
# see https://github.com/python-pillow/Pillow/issues/452
# pixelaccess is using signed int* instead of uint*
self.check(mode, expected_color)
@pytest.mark.parametrize("mode", ("P", "PA"))
@pytest.mark.parametrize("color", ((255, 0, 0), (255, 0, 0, 255)))
def test_p_putpixel_rgb_rgba(self, mode, color):
im = Image.new(mode, (1, 1))
im.putpixel((0, 0), color)
alpha = color[3] if len(color) == 4 and mode == "PA" else 255
assert im.convert("RGBA").getpixel((0, 0)) == (255, 0, 0, alpha)
@pytest.mark.filterwarnings("ignore::DeprecationWarning")
@pytest.mark.skipif(cffi is None, reason="No CFFI")
class TestCffiPutPixel(TestImagePutPixel):
_need_cffi_access = True
@pytest.mark.filterwarnings("ignore::DeprecationWarning")
@pytest.mark.skipif(cffi is None, reason="No CFFI")
class TestCffiGetPixel(TestImageGetPixel):
_need_cffi_access = True
@pytest.mark.skipif(cffi is None, reason="No CFFI")
class TestCffi(AccessTest):
_need_cffi_access = True
def _test_get_access(self, im):
"""Do we get the same thing as the old pixel access
Using private interfaces, forcing a capi access and
a pyaccess for the same image"""
caccess = im.im.pixel_access(False)
with pytest.warns(DeprecationWarning):
access = PyAccess.new(im, False)
w, h = im.size
for x in range(0, w, 10):
for y in range(0, h, 10):
assert access[(x, y)] == caccess[(x, y)]
# Access an out-of-range pixel
with pytest.raises(ValueError):
access[(access.xsize + 1, access.ysize + 1)]
def test_get_vs_c(self):
with pytest.warns(DeprecationWarning):
rgb = hopper("RGB")
rgb.load()
self._test_get_access(rgb)
for mode in ("RGBA", "L", "LA", "1", "P", "F"):
self._test_get_access(hopper(mode))
for mode in ("I;16", "I;16L", "I;16B", "I;16N", "I"):
im = Image.new(mode, (10, 10), 40000)
self._test_get_access(im)
# These don't actually appear to be modes that I can actually make,
# as unpack sets them directly into the I mode.
# im = Image.new('I;32L', (10, 10), -2**10)
# self._test_get_access(im)
# im = Image.new('I;32B', (10, 10), 2**10)
# self._test_get_access(im)
def _test_set_access(self, im, color):
"""Are we writing the correct bits into the image?
Using private interfaces, forcing a capi access and
a pyaccess for the same image"""
caccess = im.im.pixel_access(False)
with pytest.warns(DeprecationWarning):
access = PyAccess.new(im, False)
w, h = im.size
for x in range(0, w, 10):
for y in range(0, h, 10):
access[(x, y)] = color
assert color == caccess[(x, y)]
# Attempt to set the value on a read-only image
with pytest.warns(DeprecationWarning):
access = PyAccess.new(im, True)
with pytest.raises(ValueError):
access[(0, 0)] = color
def test_set_vs_c(self):
rgb = hopper("RGB")
with pytest.warns(DeprecationWarning):
rgb.load()
self._test_set_access(rgb, (255, 128, 0))
self._test_set_access(hopper("RGBA"), (255, 192, 128, 0))
self._test_set_access(hopper("L"), 128)
self._test_set_access(hopper("LA"), (128, 128))
self._test_set_access(hopper("1"), 255)
self._test_set_access(hopper("P"), 128)
# self._test_set_access(i, (128, 128)) #PA -- undone how to make
self._test_set_access(hopper("F"), 1024.0)
for mode in ("I;16", "I;16L", "I;16B", "I;16N", "I"):
im = Image.new(mode, (10, 10), 40000)
self._test_set_access(im, 45000)
# im = Image.new('I;32L', (10, 10), -(2**10))
# self._test_set_access(im, -(2**13)+1)
# im = Image.new('I;32B', (10, 10), 2**10)
# self._test_set_access(im, 2**13-1)
@pytest.mark.filterwarnings("ignore::DeprecationWarning")
def test_not_implemented(self):
assert PyAccess.new(hopper("BGR;15")) is None
# ref https://github.com/python-pillow/Pillow/pull/2009
def test_reference_counting(self):
size = 10
for _ in range(10):
# Do not save references to the image, only to the access object
with pytest.warns(DeprecationWarning):
px = Image.new("L", (size, 1), 0).load()
for i in range(size):
# pixels can contain garbage if image is released
assert px[i, 0] == 0
@pytest.mark.parametrize("mode", ("P", "PA"))
def test_p_putpixel_rgb_rgba(self, mode):
for color in ((255, 0, 0), (255, 0, 0, 127 if mode == "PA" else 255)):
im = Image.new(mode, (1, 1))
with pytest.warns(DeprecationWarning):
access = PyAccess.new(im, False)
access.putpixel((0, 0), color)
if len(color) == 3:
color += (255,)
assert im.convert("RGBA").getpixel((0, 0)) == color
class TestImagePutPixelError(AccessTest):
IMAGE_MODES1 = ["LA", "RGB", "RGBA", "BGR;15"]
IMAGE_MODES2 = ["L", "I", "I;16"]
INVALID_TYPES = ["foo", 1.0, None]
@pytest.mark.parametrize("mode", IMAGE_MODES1)
def test_putpixel_type_error1(self, mode):
im = hopper(mode)
for v in self.INVALID_TYPES:
with pytest.raises(TypeError, match="color must be int or tuple"):
im.putpixel((0, 0), v)
@pytest.mark.parametrize(
("mode", "band_numbers", "match"),
(
("L", (0, 2), "color must be int or single-element tuple"),
("LA", (0, 3), "color must be int, or tuple of one or two elements"),
(
"BGR;15",
(0, 2),
"color must be int, or tuple of one or three elements",
),
(
"RGB",
(0, 2, 5),
"color must be int, or tuple of one, three or four elements",
),
),
)
def test_putpixel_invalid_number_of_bands(self, mode, band_numbers, match):
im = hopper(mode)
for band_number in band_numbers:
with pytest.raises(TypeError, match=match):
im.putpixel((0, 0), (0,) * band_number)
@pytest.mark.parametrize("mode", IMAGE_MODES2)
def test_putpixel_type_error2(self, mode):
im = hopper(mode)
for v in self.INVALID_TYPES:
with pytest.raises(
TypeError, match="color must be int or single-element tuple"
):
im.putpixel((0, 0), v)
@pytest.mark.parametrize("mode", IMAGE_MODES1 + IMAGE_MODES2)
def test_putpixel_overflow_error(self, mode):
im = hopper(mode)
with pytest.raises(OverflowError):
im.putpixel((0, 0), 2**80)
class TestEmbeddable:
@pytest.mark.xfail(reason="failing test")
@pytest.mark.skipif(not is_win32(), reason="requires Windows")
def test_embeddable(self):
import ctypes
from setuptools.command.build_ext import new_compiler
with open("embed_pil.c", "w", encoding="utf-8") as fh:
fh.write(
"""
#include "Python.h"
int main(int argc, char* argv[])
{
char *home = "%s";
wchar_t *whome = Py_DecodeLocale(home, NULL);
Py_SetPythonHome(whome);
Py_InitializeEx(0);
Py_DECREF(PyImport_ImportModule("PIL.Image"));
Py_Finalize();
Py_InitializeEx(0);
Py_DECREF(PyImport_ImportModule("PIL.Image"));
Py_Finalize();
PyMem_RawFree(whome);
return 0;
}
"""
% sys.prefix.replace("\\", "\\\\")
)
compiler = new_compiler()
compiler.add_include_dir(sysconfig.get_config_var("INCLUDEPY"))
libdir = sysconfig.get_config_var("LIBDIR") or sysconfig.get_config_var(
"INCLUDEPY"
).replace("include", "libs")
compiler.add_library_dir(libdir)
objects = compiler.compile(["embed_pil.c"])
compiler.link_executable(objects, "embed_pil")
env = os.environ.copy()
env["PATH"] = sys.prefix + ";" + env["PATH"]
# do not display the Windows Error Reporting dialog
ctypes.windll.kernel32.SetErrorMode(0x0002)
process = subprocess.Popen(["embed_pil.exe"], env=env)
process.communicate()
assert process.returncode == 0
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