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DXT1 supports 8-bit alpha

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This commit is contained in:
Andrew Murray 2025-05-06 20:37:34 +10:00
parent 320dff834d
commit 3f09f9b5cc
1 changed files with 7 additions and 4 deletions
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11
src/PIL/VtfImagePlugin.py
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@ -15,7 +15,7 @@ from __future__ import annotations
import struct import struct
from enum import IntEnum, IntFlag from enum import IntEnum, IntFlag
from math import ceil, log from math import ceil, log
from typing import IO, NamedTuple from typing import IO, NamedTuple, cast
from . import Image, ImageFile from . import Image, ImageFile
@ -294,6 +294,7 @@ def _save(im: Image.Image, fp: IO[bytes], filename: str | bytes) -> None:
flags = CompiledVtfFlags(0) flags = CompiledVtfFlags(0)
if pixel_format in ( if pixel_format in (
VtfPF.DXT1,
VtfPF.DXT3, VtfPF.DXT3,
VtfPF.DXT5, VtfPF.DXT5,
VtfPF.RGBA8888, VtfPF.RGBA8888,
@ -360,9 +361,11 @@ def _save(im: Image.Image, fp: IO[bytes], filename: str | bytes) -> None:
min_size = 4 if pixel_format in BLOCK_COMPRESSED else 1 min_size = 4 if pixel_format in BLOCK_COMPRESSED else 1
for mip_id in range(mipmap_count - 1, 0, -1): for mip_id in range(mipmap_count - 1, 0, -1):
mip_width = max(min_size, width >> mip_id) size = cast(
mip_height = max(min_size, height >> mip_id) tuple[int, int],
mip = im.resize((mip_width, mip_height)) tuple(max(min_size, dimension >> mip_id) for dimension in im.size),
)
mip = im.resize(size)
_write_image(fp, mip, pixel_format) _write_image(fp, mip, pixel_format)
_write_image(fp, im, pixel_format) _write_image(fp, im, pixel_format)