Support reading BC4U and DX10 BC1 images

Tests/test_file_dds.py

@@ -17,6 +17,9 @@
 TEST_FILE_DX10_BC5_TYPELESS = "Tests/images/bc5_typeless.dds"
 TEST_FILE_DX10_BC5_UNORM = "Tests/images/bc5_unorm.dds"
 TEST_FILE_DX10_BC5_SNORM = "Tests/images/bc5_snorm.dds"
+TEST_FILE_DX10_BC1 = "Tests/images/bc1.dds"
+TEST_FILE_DX10_BC1_TYPELESS = "Tests/images/bc1_typeless.dds"
+TEST_FILE_BC4U = "Tests/images/bc4u.dds"
 TEST_FILE_BC5S = "Tests/images/bc5s.dds"
 TEST_FILE_BC5U = "Tests/images/bc5u.dds"
 TEST_FILE_BC6H = "Tests/images/bc6h.dds"
@@ -31,11 +34,20 @@
 TEST_FILE_UNCOMPRESSED_RGB_WITH_ALPHA = "Tests/images/uncompressed_rgb.dds"
 
 
-def test_sanity_dxt1():
-    """Check DXT1 images can be opened"""
+@pytest.mark.parametrize(
+    "image_path",
+    (
+        TEST_FILE_DXT1,
+        # hexeditted to use DX10 FourCC
+        TEST_FILE_DX10_BC1,
+        TEST_FILE_DX10_BC1_TYPELESS,
+    ),
+)
+def test_sanity_dxt1_bc1(image_path):
+    """Check DXT1 and BC1 images can be opened"""
     with Image.open(TEST_FILE_DXT1.replace(".dds", ".png")) as target:
         target = target.convert("RGBA")
-    with Image.open(TEST_FILE_DXT1) as im:
+    with Image.open(image_path) as im:
         im.load()
 
         assert im.format == "DDS"
@@ -71,10 +83,18 @@ def test_sanity_dxt5():
     assert_image_equal_tofile(im, TEST_FILE_DXT5.replace(".dds", ".png"))
 
 
-def test_sanity_ati1():
-    """Check ATI1 images can be opened"""
+@pytest.mark.parametrize(
+    "image_path",
+    (
+        TEST_FILE_ATI1,
+        # hexeditted to use BC4U FourCC
+        TEST_FILE_BC4U,
+    ),
+)
+def test_sanity_ati1_bc4u(image_path):
+    """Check ATI1 and BC4U images can be opened"""
 
-    with Image.open(TEST_FILE_ATI1) as im:
+    with Image.open(image_path) as im:
         im.load()
 
         assert im.format == "DDS"
@@ -222,12 +242,6 @@ def test_dx10_r8g8b8a8_unorm_srgb():
         )
 
 
-def test_unimplemented_dxgi_format():
-    with pytest.raises(NotImplementedError):
-        with Image.open("Tests/images/unimplemented_dxgi_format.dds"):
-            pass
-
-
 @pytest.mark.parametrize(
     ("mode", "size", "test_file"),
     [
@@ -326,9 +340,29 @@ def test_palette():
         assert_image_equal_tofile(im, "Tests/images/transparent.gif")
 
 
-def test_unimplemented_pixel_format():
+@pytest.mark.parametrize(
+    "test_file",
+    (
+        "Tests/images/unsupported_bitcount_rgb.dds",
+        "Tests/images/unsupported_bitcount_luminance.dds",
+    ),
+)
+def test_unsupported_bitcount(test_file):
+    with pytest.raises(OSError):
+        with Image.open(test_file):
+            pass
+
+
+@pytest.mark.parametrize(
+    "test_file",
+    (
+        "Tests/images/unimplemented_dxgi_format.dds",
+        "Tests/images/unimplemented_pfflags.dds",
+    ),
+)
+def test_not_implemented(test_file):
     with pytest.raises(NotImplementedError):
-        with Image.open("Tests/images/unimplemented_pixel_format.dds"):
+        with Image.open(test_file):
             pass
 
 

docs/releasenotes/10.2.0.rst

@@ -0,0 +1,54 @@
+10.2.0
+------
+
+Backwards Incompatible Changes
+==============================
+
+TODO
+^^^^
+
+TODO
+
+Deprecations
+============
+
+TODO
+^^^^
+
+TODO
+
+API Changes
+===========
+
+TODO
+^^^^
+
+TODO
+
+API Additions
+=============
+
+Added DdsImagePlugin enums
+^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+``DDSD``, ``DDSCAPS``, ``DDSCAPS2``, ``DDPF``, ``DXGI_FORMAT`` and ``D3DFMT``
+enums have been added to DdsImagePlugin.
+
+Security
+========
+
+TODO
+^^^^
+
+TODO
+
+Other Changes
+=============
+
+Added DDS BC4U and DX10 BC1 and BC4 reading
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Support has been added to read the BC4U format of DDS images.
+
+Support has also been added to read DX10 BC1 and BC4, whether UNORM or
+TYPELESS.

docs/releasenotes/index.rst

@@ -14,6 +14,7 @@ expected to be backported to earlier versions.
 .. toctree::
   :maxdepth: 2
 
+  10.2.0
   10.1.0
   10.0.1
   10.0.0