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Add support for BC4 dds files

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This commit is contained in:
Sam Bourne 2023-12-04 09:54:10 -08:00
parent 76446ee450
commit 8c5d5c7e6b
3 changed files with 19 additions and 1 deletions
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Tests/images/bc4_unorm.dds Normal file
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12
Tests/test_file_dds.py
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@ -12,6 +12,7 @@ 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_ATI1 = "Tests/images/ati1.dds"
TEST_FILE_ATI2 = "Tests/images/ati2.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"
TEST_FILE_DX10_BC5_SNORM = "Tests/images/bc5_snorm.dds"
@ -82,6 +83,17 @@ def test_sanity_ati1():
assert_image_equal_tofile(im, TEST_FILE_ATI1.replace(".dds", ".png"))
def test_dx10_bc4():
"""Check DX10 BC4 images can be opened"""
with Image.open(TEST_FILE_DX10_BC4_UNORM) as im:
im.load()
assert im.format == "DDS"
assert im.mode == "L"
assert im.size == (64, 64)
@pytest.mark.parametrize(
"image_path",
(

8
src/PIL/DdsImagePlugin.py
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@ -98,6 +98,8 @@ DXT5_FOURCC = 0x35545844
DXGI_FORMAT_R8G8B8A8_TYPELESS = 27
DXGI_FORMAT_R8G8B8A8_UNORM = 28
DXGI_FORMAT_R8G8B8A8_UNORM_SRGB = 29
DXGI_FORMAT_BC4_TYPELESS = 79
DXGI_FORMAT_BC4_UNORM = 80
DXGI_FORMAT_BC5_TYPELESS = 82
DXGI_FORMAT_BC5_UNORM = 83
DXGI_FORMAT_BC5_SNORM = 84
@ -190,7 +192,11 @@ class DdsImageFile(ImageFile.ImageFile):
# ignoring flags which pertain to volume textures and cubemaps
(dxgi_format,) = struct.unpack("<I", self.fp.read(4))
self.fp.read(16)
if dxgi_format in (DXGI_FORMAT_BC5_TYPELESS, DXGI_FORMAT_BC5_UNORM):
if dxgi_format in (DXGI_FORMAT_BC4_TYPELESS, DXGI_FORMAT_BC4_UNORM):
self.pixel_format = "BC4"
n = 4
self._mode = "L"
elif dxgi_format in (DXGI_FORMAT_BC5_TYPELESS, DXGI_FORMAT_BC5_UNORM):
self.pixel_format = "BC5"
n = 5
self._mode = "RGB"