Make qimage_to_array() work on big endian (#288)

* Make qimage_to_array() work on big endian

Make sure the returned ndarray is ordered the same as on little
endian systems.

Solves #287

* style: [pre-commit.ci] auto fixes [...]

* Update src/superqt/utils/_img_utils.py

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Grzegorz Bokota <bokota+github@gmail.com>

Author: 3 people

src/superqt/utils/_img_utils.py

@@ -1,3 +1,4 @@
+import sys
 from typing import TYPE_CHECKING
 
 from qtpy.QtGui import QImage
@@ -37,4 +38,8 @@ def qimage_to_array(img: QImage) -> "np.ndarray":
     arr = np.frombuffer(b, np.uint8).reshape(h, w, c)
 
     # reverse channel colors for numpy
-    return arr.take([2, 1, 0, 3], axis=2)
+    # On big endian we need to specify a different order
+    if sys.byteorder == "big":
+        return arr.take([1, 2, 3, 0], axis=2)  # pragma: no cover
+    else:
+        return arr.take([2, 1, 0, 3], axis=2)