From c1b3c3467882c3af0cd510ac4bc202a35ef7e04f Mon Sep 17 00:00:00 2001
From: Andrew Murray <radarhere@users.noreply.github.com>
Date: Tue, 5 Dec 2023 07:18:07 +1100
Subject: [PATCH 1/2] Added expected test image

---
 Tests/images/bc4_unorm.png | Bin 0 -> 982 bytes
 Tests/test_file_dds.py     |   2 ++
 2 files changed, 2 insertions(+)
 create mode 100644 Tests/images/bc4_unorm.png

diff --git a/Tests/images/bc4_unorm.png b/Tests/images/bc4_unorm.png
new file mode 100644
index 0000000000000000000000000000000000000000..71d536c8453b16874c3ce777555fbbfb55667b60
GIT binary patch
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diff --git a/Tests/test_file_dds.py b/Tests/test_file_dds.py
index 85a3ae172b9..337f541f6a6 100644
--- a/Tests/test_file_dds.py
+++ b/Tests/test_file_dds.py
@@ -93,6 +93,8 @@ def test_dx10_bc4():
         assert im.mode == "L"
         assert im.size == (64, 64)
 
+        assert_image_equal_tofile(im, TEST_FILE_DX10_BC4_UNORM.replace(".dds", ".png"))
+
 
 @pytest.mark.parametrize(
     "image_path",

From 0e36c14680a2023d5f1e5ab118d48bbeb4c9ba31 Mon Sep 17 00:00:00 2001
From: Andrew Murray <radarhere@users.noreply.github.com>
Date: Tue, 5 Dec 2023 07:39:15 +1100
Subject: [PATCH 2/2] Added test BC4 TYPELESS image

---
 Tests/images/bc4_typeless.dds | Bin 0 -> 2892 bytes
 Tests/test_file_dds.py        |  13 +++++++++++--
 2 files changed, 11 insertions(+), 2 deletions(-)
 create mode 100644 Tests/images/bc4_typeless.dds

diff --git a/Tests/images/bc4_typeless.dds b/Tests/images/bc4_typeless.dds
new file mode 100644
index 0000000000000000000000000000000000000000..27f87889f43d5b5054f3971c412a594dc4dc161e
GIT binary patch
literal 2892
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literal 0
HcmV?d00001

diff --git a/Tests/test_file_dds.py b/Tests/test_file_dds.py
index 337f541f6a6..e9fb045887b 100644
--- a/Tests/test_file_dds.py
+++ b/Tests/test_file_dds.py
@@ -12,6 +12,7 @@
 TEST_FILE_DXT5 = "Tests/images/dxt5-argb-8bbp-interpolatedalpha_MipMaps-1.dds"
 TEST_FILE_ATI1 = "Tests/images/ati1.dds"
 TEST_FILE_ATI2 = "Tests/images/ati2.dds"
+TEST_FILE_DX10_BC4_TYPELESS = "Tests/images/bc4_typeless.dds"
 TEST_FILE_DX10_BC4_UNORM = "Tests/images/bc4_unorm.dds"
 TEST_FILE_DX10_BC5_TYPELESS = "Tests/images/bc5_typeless.dds"
 TEST_FILE_DX10_BC5_UNORM = "Tests/images/bc5_unorm.dds"
@@ -83,10 +84,18 @@ def test_sanity_ati1():
         assert_image_equal_tofile(im, TEST_FILE_ATI1.replace(".dds", ".png"))
 
 
-def test_dx10_bc4():
+@pytest.mark.parametrize(
+    "image_path",
+    (
+        TEST_FILE_DX10_BC4_UNORM,
+        # hexeditted to be typeless
+        TEST_FILE_DX10_BC4_TYPELESS,
+    ),
+)
+def test_dx10_bc4(image_path):
     """Check DX10 BC4 images can be opened"""
 
-    with Image.open(TEST_FILE_DX10_BC4_UNORM) as im:
+    with Image.open(image_path) as im:
         im.load()
 
         assert im.format == "DDS"