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Added USE_RAW_ALPHA

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This commit is contained in:
Andrew Murray 2024-12-16 16:56:57 +11:00
parent 6e45e71052
commit ff47a59288
2 changed files with 15 additions and 1 deletions
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10
Tests/test_file_bmp.py
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@ -230,3 +230,13 @@ def test_offset() -> None:
# to exclude the palette size from the pixel data offset
with Image.open("Tests/images/pal8_offset.bmp") as im:
assert_image_equal_tofile(im, "Tests/images/bmp/g/pal8.bmp")
def test_use_raw_alpha(monkeypatch: pytest.MonkeyPatch) -> None:
with Image.open("Tests/images/bmp/g/rgb32.bmp") as im:
assert im.info["compression"] == BmpImagePlugin.BmpImageFile.COMPRESSIONS["RAW"]
assert im.mode == "RGB"
monkeypatch.setattr(BmpImagePlugin, "USE_RAW_ALPHA", True)
with Image.open("Tests/images/bmp/g/rgb32.bmp") as im:
assert im.mode == "RGBA"

6
src/PIL/BmpImagePlugin.py
View File

@ -48,6 +48,8 @@ BIT2MODE = {
32: ("RGB", "BGRX"),
}
USE_RAW_ALPHA = False
def _accept(prefix: bytes) -> bool:
return prefix[:2] == b"BM"
@ -242,7 +244,9 @@ class BmpImageFile(ImageFile.ImageFile):
msg = "Unsupported BMP bitfields layout"
raise OSError(msg)
elif file_info["compression"] == self.COMPRESSIONS["RAW"]:
if file_info["bits"] == 32 and header == 22: # 32-bit .cur offset
if file_info["bits"] == 32 and (
header == 22 or USE_RAW_ALPHA # 32-bit .cur offset
):
raw_mode, self._mode = "BGRA", "RGBA"
elif file_info["compression"] in (
self.COMPRESSIONS["RLE8"],