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Support arbitrary masks for uncompressed RGB DDS images #7589

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merged 5 commits into from Dec 31, 2023
Merged

Support arbitrary masks for uncompressed RGB DDS images #7589

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f1fef09
Support arbitrary masks for uncompressed RGB images
radarhere Nov 30, 2023
30eb414
Use f-string
radarhere Dec 1, 2023
2e8dd3b
Use int.from_bytes()
radarhere Dec 1, 2023
8b44116
Merge branch 'main' into dds_rgb
radarhere Dec 6, 2023
232094e
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Dec 6, 2023
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Binary file added Tests/images/bgr15.dds
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Binary file added Tests/images/bgr15.png
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2 changes: 2 additions & 0 deletions Tests/test_file_dds.py
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Expand Up @@ -26,6 +26,7 @@
TEST_FILE_UNCOMPRESSED_L = "Tests/images/uncompressed_l.dds"
TEST_FILE_UNCOMPRESSED_L_WITH_ALPHA = "Tests/images/uncompressed_la.dds"
TEST_FILE_UNCOMPRESSED_RGB = "Tests/images/hopper.dds"
TEST_FILE_UNCOMPRESSED_BGR15 = "Tests/images/bgr15.dds"
TEST_FILE_UNCOMPRESSED_RGB_WITH_ALPHA = "Tests/images/uncompressed_rgb.dds"


Expand Down Expand Up @@ -211,6 +212,7 @@ def test_unimplemented_dxgi_format():
("L", (128, 128), TEST_FILE_UNCOMPRESSED_L),
("LA", (128, 128), TEST_FILE_UNCOMPRESSED_L_WITH_ALPHA),
("RGB", (128, 128), TEST_FILE_UNCOMPRESSED_RGB),
("RGB", (128, 128), TEST_FILE_UNCOMPRESSED_BGR15),
("RGBA", (800, 600), TEST_FILE_UNCOMPRESSED_RGB_WITH_ALPHA),
],
)
Expand Down
48 changes: 42 additions & 6 deletions src/PIL/DdsImagePlugin.py
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Expand Up @@ -14,6 +14,7 @@
from io import BytesIO

from . import Image, ImageFile, ImagePalette
from ._binary import o8
from ._binary import o32le as o32

# Magic ("DDS ")
Expand Down Expand Up @@ -137,7 +138,6 @@ def _open(self):
pfsize, pfflags = struct.unpack("<2I", header.read(8))
fourcc = header.read(4)
(bitcount,) = struct.unpack("<I", header.read(4))
masks = struct.unpack("<4I", header.read(16))
if pfflags & DDPF_LUMINANCE:
# Texture contains uncompressed L or LA data
if pfflags & DDPF_ALPHAPIXELS:
Expand All @@ -148,15 +148,16 @@ def _open(self):
self.tile = [("raw", (0, 0) + self.size, 0, (self.mode, 0, 1))]
elif pfflags & DDPF_RGB:
# Texture contains uncompressed RGB data
masks = {mask: ["R", "G", "B", "A"][i] for i, mask in enumerate(masks)}
rawmode = ""
if pfflags & DDPF_ALPHAPIXELS:
rawmode += masks[0xFF000000]
mask_count = 4
else:
self._mode = "RGB"
rawmode += masks[0xFF0000] + masks[0xFF00] + masks[0xFF]
mask_count = 3

self.tile = [("raw", (0, 0) + self.size, 0, (rawmode[::-1], 0, 1))]
masks = struct.unpack(
"<" + str(mask_count) + "I", header.read(mask_count * 4)
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)
self.tile = [("dds_rgb", (0, 0) + self.size, 0, (bitcount, masks))]
elif pfflags & DDPF_PALETTEINDEXED8:
self._mode = "P"
self.palette = ImagePalette.raw("RGBA", self.fp.read(1024))
Expand Down Expand Up @@ -237,6 +238,40 @@ def load_seek(self, pos):
pass


class DdsRgbDecoder(ImageFile.PyDecoder):
_pulls_fd = True

def decode(self, buffer):
bitcount, masks = self.args

# Some masks will be padded with zeros, e.g. R 0b11 G 0b1100
# Calculate how many zeros each mask is padded with
mask_offsets = []
# And the maximum value of each channel without the padding
mask_totals = []
for mask in masks:
offset = 0
if mask != 0:
while mask >> (offset + 1) << (offset + 1) == mask:
offset += 1
mask_offsets.append(offset)
mask_totals.append(mask >> offset)

data = bytearray()
bytecount = bitcount // 8
while len(data) < self.state.xsize * self.state.ysize * len(masks):
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Might be worth it to precalculate the total here to avoid that extra multiplication every loop (since we know the value can't possibly change):

Suggested change
while len(data) < self.state.xsize * self.state.ysize * len(masks):
total_size = self.state.xsize * self.state.ysize * len(masks)
while len(data) < total_size:

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I personally think the current version is simpler to read, and expect the performance difference to be negligible.

The current version is also used in a few other places in Pillow - but at the same time, that's probably because I wrote them.

Pillow/src/PIL/QoiImagePlugin.py

Line 55 in 316f397

while len(data) < self.state.xsize * self.state.ysize * bands:

value = self.fd.read(bytecount)
int_value = sum(value[i] << i * 8 for i in range(bytecount))
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int.from_bytes?

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Thanks, I've pushed a commit.

for i, mask in enumerate(masks):
masked_value = int_value & mask
# Remove the zero padding, and scale it to 8 bits
data += o8(
int(((masked_value >> mask_offsets[i]) / mask_totals[i]) * 255)
)
self.set_as_raw(bytes(data))
return -1, 0


def _save(im, fp, filename):
if im.mode not in ("RGB", "RGBA", "L", "LA"):
msg = f"cannot write mode {im.mode} as DDS"
Expand Down Expand Up @@ -291,5 +326,6 @@ def _accept(prefix):


Image.register_open(DdsImageFile.format, DdsImageFile, _accept)
Image.register_decoder("dds_rgb", DdsRgbDecoder)
Image.register_save(DdsImageFile.format, _save)
Image.register_extension(DdsImageFile.format, ".dds")