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Fixed endian handling for I;16 getextrema #4457

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merged 1 commit into from Mar 25, 2020
Merged

Fixed endian handling for I;16 getextrema #4457

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5 changes: 1 addition & 4 deletions Tests/test_image_getextrema.py
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@@ -1,10 +1,8 @@
import pytest
from PIL import Image

from .helper import hopper, is_big_endian, on_ci
from .helper import hopper


@pytest.mark.xfail(is_big_endian() and on_ci(), reason="Fails on big-endian")
def test_extrema():
def extrema(mode):
return hopper(mode).getextrema()
Expand All @@ -20,7 +18,6 @@ def extrema(mode):
assert extrema("I;16") == (1, 255)


@pytest.mark.xfail(is_big_endian() and on_ci(), reason="Fails on big-endian")
def test_true_16():
with Image.open("Tests/images/16_bit_noise.tif") as im:
assert im.mode == "I;16"
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14 changes: 12 additions & 2 deletions src/libImaging/GetBBox.c
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Expand Up @@ -166,11 +166,21 @@ ImagingGetExtrema(Imaging im, void *extrema)
case IMAGING_TYPE_SPECIAL:
if (strcmp(im->mode, "I;16") == 0) {
UINT16 v;
memcpy(&v, *im->image8, sizeof(v));
UINT8* pixel = *im->image8;
#ifdef WORDS_BIGENDIAN
v = pixel[0] + (pixel[1] << 8);
#else
memcpy(&v, pixel, sizeof(v));
#endif
imin = imax = v;
for (y = 0; y < im->ysize; y++) {
for (x = 0; x < im->xsize; x++) {
memcpy(&v, im->image[y] + x * sizeof(v), sizeof(v));
pixel = im->image[y] + x * sizeof(v);
#ifdef WORDS_BIGENDIAN
v = pixel[0] + (pixel[1] << 8);
#else
memcpy(&v, pixel, sizeof(v));
#endif
if (imin > v)
imin = v;
else if (imax < v)
Expand Down