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Pillow/Tests/test_image_access.py
Jon Dufresne 33dabf986f Import unittest from stdlib rather than helper.py 
The unittest in helper.py has not offered an interesting abstraction
since dbe9f85c7d so import from the more
typical stdlib location.
2019-11-20 18:42:52 -08:00

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import ctypes
import os
import subprocess
import sys
import unittest
from distutils import ccompiler, sysconfig
from PIL import Image
from .helper import PillowTestCase, hopper, is_win32, on_ci
# 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:
from PIL import PyAccess
import cffi
except ImportError:
cffi = None
class AccessTest(PillowTestCase):
# initial value
_init_cffi_access = Image.USE_CFFI_ACCESS
_need_cffi_access = False
@classmethod
def setUpClass(cls):
Image.USE_CFFI_ACCESS = cls._need_cffi_access
@classmethod
def tearDownClass(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))
self.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))
self.assertFalse(im2.readonly)
self.assert_image_equal(im1, im2)
im2 = Image.new(im1.mode, im1.size, 0)
pix1 = im1.load()
pix2 = im2.load()
for y in range(im1.size[1]):
for x in range(im1.size[0]):
pix2[x, y] = pix1[x, y]
self.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
self.assertEqual(im1.getpixel((0, 0)), im1.getpixel((-width, -height)))
self.assertEqual(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))
self.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))
self.assertFalse(im2.readonly)
self.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]
self.assert_image_equal(im1, im2)
class TestImageGetPixel(AccessTest):
@staticmethod
def color(mode):
bands = Image.getmodebands(mode)
if bands == 1:
return 1
else:
return tuple(range(1, bands + 1))
def check(self, mode, c=None):
if not c:
c = self.color(mode)
# check putpixel
im = Image.new(mode, (1, 1), None)
im.putpixel((0, 0), c)
self.assertEqual(
im.getpixel((0, 0)),
c,
"put/getpixel roundtrip failed for mode {}, color {}".format(mode, c),
)
# check putpixel negative index
im.putpixel((-1, -1), c)
self.assertEqual(
im.getpixel((-1, -1)),
c,
"put/getpixel roundtrip negative index failed"
" for mode %s, color %s" % (mode, c),
)
# Check 0
im = Image.new(mode, (0, 0), None)
with self.assertRaises(IndexError):
im.putpixel((0, 0), c)
with self.assertRaises(IndexError):
im.getpixel((0, 0))
# Check 0 negative index
with self.assertRaises(IndexError):
im.putpixel((-1, -1), c)
with self.assertRaises(IndexError):
im.getpixel((-1, -1))
# check initial color
im = Image.new(mode, (1, 1), c)
self.assertEqual(
im.getpixel((0, 0)),
c,
"initial color failed for mode {}, color {} ".format(mode, c),
)
# check initial color negative index
self.assertEqual(
im.getpixel((-1, -1)),
c,
"initial color failed with negative index"
"for mode %s, color %s " % (mode, c),
)
# Check 0
im = Image.new(mode, (0, 0), c)
with self.assertRaises(IndexError):
im.getpixel((0, 0))
# Check 0 negative index
with self.assertRaises(IndexError):
im.getpixel((-1, -1))
def test_basic(self):
for mode in (
"1",
"L",
"LA",
"I",
"I;16",
"I;16B",
"F",
"P",
"PA",
"RGB",
"RGBA",
"RGBX",
"CMYK",
"YCbCr",
):
self.check(mode)
def test_signedness(self):
# see https://github.com/python-pillow/Pillow/issues/452
# pixelaccess is using signed int* instead of uint*
for mode in ("I;16", "I;16B"):
self.check(mode, 2 ** 15 - 1)
self.check(mode, 2 ** 15)
self.check(mode, 2 ** 15 + 1)
self.check(mode, 2 ** 16 - 1)
def test_p_putpixel_rgb_rgba(self):
for color in [(255, 0, 0), (255, 0, 0, 255)]:
im = Image.new("P", (1, 1), 0)
im.putpixel((0, 0), color)
self.assertEqual(im.convert("RGB").getpixel((0, 0)), (255, 0, 0))
@unittest.skipIf(cffi is None, "No cffi")
class TestCffiPutPixel(TestImagePutPixel):
_need_cffi_access = True
@unittest.skipIf(cffi is None, "No cffi")
class TestCffiGetPixel(TestImageGetPixel):
_need_cffi_access = True
@unittest.skipIf(cffi is None, "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)
access = PyAccess.new(im, False)
w, h = im.size
for x in range(0, w, 10):
for y in range(0, h, 10):
self.assertEqual(access[(x, y)], caccess[(x, y)])
# Access an out-of-range pixel
self.assertRaises(
ValueError, lambda: access[(access.xsize + 1, access.ysize + 1)]
)
def test_get_vs_c(self):
rgb = hopper("RGB")
rgb.load()
self._test_get_access(rgb)
self._test_get_access(hopper("RGBA"))
self._test_get_access(hopper("L"))
self._test_get_access(hopper("LA"))
self._test_get_access(hopper("1"))
self._test_get_access(hopper("P"))
# self._test_get_access(hopper('PA')) # PA -- how do I make a PA image?
self._test_get_access(hopper("F"))
im = Image.new("I;16", (10, 10), 40000)
self._test_get_access(im)
im = Image.new("I;16L", (10, 10), 40000)
self._test_get_access(im)
im = Image.new("I;16B", (10, 10), 40000)
self._test_get_access(im)
im = Image.new("I", (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)
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
self.assertEqual(color, caccess[(x, y)])
# Attempt to set the value on a read-only image
access = PyAccess.new(im, True)
with self.assertRaises(ValueError):
access[(0, 0)] = color
def test_set_vs_c(self):
rgb = hopper("RGB")
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)
im = Image.new("I;16", (10, 10), 40000)
self._test_set_access(im, 45000)
im = Image.new("I;16L", (10, 10), 40000)
self._test_set_access(im, 45000)
im = Image.new("I;16B", (10, 10), 40000)
self._test_set_access(im, 45000)
im = Image.new("I", (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)
def test_not_implemented(self):
self.assertIsNone(PyAccess.new(hopper("BGR;15")))
# 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
px = Image.new("L", (size, 1), 0).load()
for i in range(size):
# pixels can contain garbage if image is released
self.assertEqual(px[i, 0], 0)
def test_p_putpixel_rgb_rgba(self):
for color in [(255, 0, 0), (255, 0, 0, 255)]:
im = Image.new("P", (1, 1), 0)
access = PyAccess.new(im, False)
access.putpixel((0, 0), color)
self.assertEqual(im.convert("RGB").getpixel((0, 0)), (255, 0, 0))
class TestEmbeddable(unittest.TestCase):
@unittest.skipIf(
not is_win32() or on_ci(),
"Failing on AppVeyor / GitHub Actions when run from subprocess, not from shell",
)
def test_embeddable(self):
with open("embed_pil.c", "w") 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 = ccompiler.new_compiler()
compiler.add_include_dir(sysconfig.get_python_inc())
libdir = sysconfig.get_config_var(
"LIBDIR"
) or sysconfig.get_python_inc().replace("include", "libs")
print(libdir)
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()
self.assertEqual(process.returncode, 0)
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