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Added support for RGBA bitfield compression

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This commit is contained in:
Andrew Murray 2019-03-08 19:26:01 +11:00
parent 22ae782320
commit 5277eec027
3 changed files with 15 additions and 1 deletions
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Tests/images/rgb32bf-rgba.bmp Normal file
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Width:  |  Height:  |  Size: 32 KiB

12
Tests/test_file_bmp.py
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@ -90,3 +90,15 @@ class TestFileBmp(PillowTestCase):
self.assertEqual(reloaded.format, "DIB")
self.assertEqual(reloaded.get_format_mimetype(), "image/bmp")
self.assert_image_equal(im, reloaded)
def test_rgba_bitfields(self):
# This test image has been manually hexedited
# to change the bitfield compression in the header from XBGR to RGBA
im = Image.open("Tests/images/rgb32bf-rgba.bmp")
# So before the comparing the image, swap the channels
b, g, r = im.split()[1:]
im = Image.merge("RGB", (r, g, b))
target = Image.open("Tests/images/bmp/q/rgb32bf-xbgr.bmp")
self.assert_image_equal(im, target)

4
src/PIL/BmpImagePlugin.py
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@ -180,6 +180,7 @@ class BmpImageFile(ImageFile.ImageFile):
SUPPORTED = {
32: [(0xff0000, 0xff00, 0xff, 0x0),
(0xff0000, 0xff00, 0xff, 0xff000000),
(0xff, 0xff00, 0xff0000, 0xff000000),
(0x0, 0x0, 0x0, 0x0),
(0xff000000, 0xff0000, 0xff00, 0x0)],
24: [(0xff0000, 0xff00, 0xff)],
@ -188,6 +189,7 @@ class BmpImageFile(ImageFile.ImageFile):
MASK_MODES = {
(32, (0xff0000, 0xff00, 0xff, 0x0)): "BGRX",
(32, (0xff000000, 0xff0000, 0xff00, 0x0)): "XBGR",
(32, (0xff, 0xff00, 0xff0000, 0xff000000)): "RGBA",
(32, (0xff0000, 0xff00, 0xff, 0xff000000)): "BGRA",
(32, (0x0, 0x0, 0x0, 0x0)): "BGRA",
(24, (0xff0000, 0xff00, 0xff)): "BGR",
@ -200,7 +202,7 @@ class BmpImageFile(ImageFile.ImageFile):
raw_mode = MASK_MODES[
(file_info["bits"], file_info["rgba_mask"])
]
self.mode = "RGBA" if raw_mode in ("BGRA",) else self.mode
self.mode = "RGBA" if "A" in raw_mode else self.mode
elif (file_info['bits'] in (24, 16) and
file_info['rgb_mask'] in SUPPORTED[file_info['bits']]):
raw_mode = MASK_MODES[