Test uint32 array creation -> image32 images

Tests/test_pyarrow.py

@@ -9,6 +9,7 @@ from PIL import Image
 from .helper import (
     assert_deep_equal,
     assert_image_equal,
+    is_big_endian,
     hopper,
 )
 
@@ -41,6 +42,34 @@ def _test_img_equals_pyarray(
                 assert_deep_equal(px[x, y], arr[y * img.width + x].as_py())
 
 
+def _test_img_equals_int32_pyarray(
+    img: Image.Image, arr: Any, mask: list[int] | None, elts_per_pixel: int = 1
+) -> None:
+    assert img.height * img.width * elts_per_pixel == len(arr)
+    px = img.load()
+    assert px is not None
+    if mask is None:
+        # have to do element wise comparison when we're comparing
+        # flattened rgba in an uint32 to a pixel.
+        mask = list(range(elts_per_pixel))
+    for x in range(0, img.size[0], int(img.size[0] / 10)):
+        for y in range(0, img.size[1], int(img.size[1] / 10)):
+            pixel = px[x, y]
+            assert isinstance(pixel, tuple)
+            arr_pixel_int = arr[y * img.width + x].as_py()
+            arr_pixel_tuple = (
+                arr_pixel_int % 256,
+                (arr_pixel_int // 256) % 256,
+                (arr_pixel_int // 256**2) % 256,
+                (arr_pixel_int // 256**3),
+            )
+            if is_big_endian():
+                arr_pixel_tuple = arr_pixel_tuple[::-1]
+
+            for ix, elt in enumerate(mask):
+                assert pixel[ix] == arr_pixel_tuple[elt]
+
+
 # really hard to get a non-nullable list type
 fl_uint8_4_type = pyarrow.field(
     "_", pyarrow.list_(pyarrow.field("_", pyarrow.uint8()).with_nullable(False), 4)
@@ -129,7 +158,11 @@ UINT = (
     3,
     4
 )
-
+INT32 = (
+    pyarrow.uint32(),
+    0xabcdef45,
+    1
+)
 
 
 @pytest.mark.parametrize(
@@ -166,3 +199,29 @@ def test_fromarray(mode: str,
     img = Image.fromarrow(arr, mode, TEST_IMAGE_SIZE)
 
     _test_img_equals_pyarray(img, arr, mask, elts_per_pixel)
+
+
+@pytest.mark.parametrize(
+    "mode, data_tp, mask",
+    (
+        ("LA", INT32, [0, 3]),
+        ("RGB", INT32, [0, 1, 2]),
+        ("RGBA", INT32, None),
+        ("RGBA", INT32, None),
+        ("CMYK", INT32, None),
+        ("YCbCr", INT32,  [0, 1, 2]),
+        ("HSV", INT32,  [0, 1, 2]),
+    ),
+)
+def test_from_int32array(mode: str,
+                         data_tp: tuple,
+                         mask:list[int] | None) -> None:
+    (dtype,
+     elt,
+     elts_per_pixel) = data_tp
+
+    ct_pixels = TEST_IMAGE_SIZE[0] * TEST_IMAGE_SIZE[1]
+    arr = pyarrow.array([elt]*(ct_pixels*elts_per_pixel), type=dtype)
+    img = Image.fromarrow(arr, mode, TEST_IMAGE_SIZE)
+
+    _test_img_equals_int32_pyarray(img, arr, mask, elts_per_pixel)