support raw rgba8888 for dds

Tests/test_file_dds.py

@@ -11,6 +11,8 @@ TEST_FILE_DXT3 = "Tests/images/dxt3-argb-8bbp-explicitalpha_MipMaps-1.dds"
 TEST_FILE_DXT5 = "Tests/images/dxt5-argb-8bbp-interpolatedalpha_MipMaps-1.dds"
 TEST_FILE_DX10_BC7 = "Tests/images/bc7-argb-8bpp_MipMaps-1.dds"
 TEST_FILE_DX10_BC7_UNORM_SRGB = "Tests/images/DXGI_FORMAT_BC7_UNORM_SRGB.dds"
+TEST_FILE_DX10_R8G8B8A8 = "Tests/images/argb-32bpp_MipMaps-1.dds"
+TEST_FILE_DX10_R8G8B8A8_UNORM_SRGB = "Tests/images/DXGI_FORMAT_R8G8B8A8_UNORM_SRGB.dds"
 TEST_FILE_UNCOMPRESSED_RGB = "Tests/images/uncompressed_rgb.dds"
 
 
@@ -87,6 +89,37 @@ def test_dx10_bc7_unorm_srgb():
             assert_image_equal(target, im)
 
 
+def test_dx10_r8g8b8a8():
+    """Check DX10 images can be opened"""
+
+    with Image.open(TEST_FILE_DX10_R8G8B8A8) as im:
+        im.load()
+
+        assert im.format == "DDS"
+        assert im.mode == "RGBA"
+        assert im.size == (256, 256)
+
+        with Image.open(TEST_FILE_DX10_R8G8B8A8.replace(".dds", ".png")) as target:
+            assert_image_equal(target, im)
+
+
+def test_dx10_r8g8b8a8_unorm_srgb():
+    """Check DX10 unsigned normalized integer images can be opened"""
+
+    with Image.open(TEST_FILE_DX10_R8G8B8A8_UNORM_SRGB) as im:
+        im.load()
+
+        assert im.format == "DDS"
+        assert im.mode == "RGBA"
+        assert im.size == (16, 16)
+        assert im.info["gamma"] == 1 / 2.2
+
+        with Image.open(
+            TEST_FILE_DX10_R8G8B8A8_UNORM_SRGB.replace(".dds", ".png")
+        ) as target:
+            assert_image_equal(target, im)
+
+
 def test_unimplemented_dxgi_format():
     with pytest.raises(NotImplementedError):
         Image.open("Tests/images/unimplemented_dxgi_format.dds")

src/PIL/DdsImagePlugin.py

@@ -94,6 +94,9 @@ DXT5_FOURCC = 0x35545844
 
 # dxgiformat.h
 
+DXGI_FORMAT_R8G8B8A8_TYPELESS = 27
+DXGI_FORMAT_R8G8B8A8_UNORM = 28
+DXGI_FORMAT_R8G8B8A8_UNORM_SRGB = 29
 DXGI_FORMAT_BC7_TYPELESS = 97
 DXGI_FORMAT_BC7_UNORM = 98
 DXGI_FORMAT_BC7_UNORM_SRGB = 99
@@ -157,6 +160,15 @@ class DdsImageFile(ImageFile.ImageFile):
                     self.pixel_format = "BC7"
                     self.info["gamma"] = 1 / 2.2
                     n = 7
+                elif dxgi_format in (
+                    DXGI_FORMAT_R8G8B8A8_TYPELESS,
+                    DXGI_FORMAT_R8G8B8A8_UNORM,
+                    DXGI_FORMAT_R8G8B8A8_UNORM_SRGB,
+                ):
+                    self.tile = [("raw", (0, 0) + self.size, 0, ("RGBA", 0, 1))]
+                    if dxgi_format == DXGI_FORMAT_R8G8B8A8_UNORM_SRGB:
+                        self.info["gamma"] = 1 / 2.2
+                    return
                 else:
                     raise NotImplementedError(
                         "Unimplemented DXGI format %d" % (dxgi_format)