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Allow converting an image to a numpy array to raise errors

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This commit is contained in:
Andrew Murray 2021-04-03 13:20:58 +11:00
parent ee079ae67e
commit 77a8a53a94
2 changed files with 35 additions and 16 deletions
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40
Tests/test_image_array.py
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@ -4,26 +4,32 @@ from PIL import Image
from .helper import hopper
numpy = pytest.importorskip("numpy", reason="NumPy not installed")
im = hopper().resize((128, 100))
def test_toarray():
def test(mode):
ai = im.convert(mode).__array_interface__
return ai["version"], ai["shape"], ai["typestr"], len(ai["data"])
ai = numpy.array(im.convert(mode))
return ai.shape, ai.dtype.str, ai.nbytes
# assert test("1") == (3, (100, 128), '|b1', 1600))
assert test("L") == (3, (100, 128), "|u1", 12800)
# assert test("1") == ((100, 128), '|b1', 1600))
assert test("L") == ((100, 128), "|u1", 12800)
# FIXME: wrong?
assert test("I") == (3, (100, 128), Image._ENDIAN + "i4", 51200)
assert test("I") == ((100, 128), Image._ENDIAN + "i4", 51200)
# FIXME: wrong?
assert test("F") == (3, (100, 128), Image._ENDIAN + "f4", 51200)
assert test("F") == ((100, 128), Image._ENDIAN + "f4", 51200)
assert test("LA") == (3, (100, 128, 2), "|u1", 25600)
assert test("RGB") == (3, (100, 128, 3), "|u1", 38400)
assert test("RGBA") == (3, (100, 128, 4), "|u1", 51200)
assert test("RGBX") == (3, (100, 128, 4), "|u1", 51200)
assert test("LA") == ((100, 128, 2), "|u1", 25600)
assert test("RGB") == ((100, 128, 3), "|u1", 38400)
assert test("RGBA") == ((100, 128, 4), "|u1", 51200)
assert test("RGBX") == ((100, 128, 4), "|u1", 51200)
with Image.open("Tests/images/truncated_jpeg.jpg") as im_truncated:
with pytest.raises(OSError):
numpy.array(im_truncated)
def test_fromarray():
@ -39,10 +45,18 @@ def test_fromarray():
def test(mode):
i = im.convert(mode)
a = i.__array_interface__
a["strides"] = 1 # pretend it's non-contiguous
a = numpy.array(i)
# Make wrapper instance for image, new array interface
wrapped = Wrapper(i, a)
wrapped = Wrapper(
i,
{
"shape": a.shape,
"typestr": a.dtype.str,
"version": 3,
"data": a.data,
"strides": 1, # pretend it's non-contiguous
},
)
out = Image.fromarray(wrapped)
return out.mode, out.size, list(i.getdata()) == list(out.getdata())

11
src/PIL/Image.py
View File

@ -676,9 +676,10 @@ class Image:
raise ValueError("Could not save to PNG for display") from e
return b.getvalue()
@property
def __array_interface__(self):
def __array__(self):
# numpy array interface support
import numpy as np
new = {}
shape, typestr = _conv_type_shape(self)
new["shape"] = shape
@ -690,7 +691,11 @@ class Image:
new["data"] = self.tobytes("raw", "L")
else:
new["data"] = self.tobytes()
return new
class ArrayData:
__array_interface__ = new
return np.array(ArrayData())
def __getstate__(self):
return [self.info, self.mode, self.size, self.getpalette(), self.tobytes()]