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Read AND mask from end

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This commit is contained in:
Andrew Murray 2021-08-10 07:04:36 +10:00
parent 953b57510f
commit cbdc751628
4 changed files with 6 additions and 1 deletions
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Tests/images/hopper_mask.ico Normal file
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5
Tests/test_file_ico.py
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@ -18,6 +18,11 @@ def test_sanity():
assert im.get_format_mimetype() == "image/x-icon"
def test_mask():
with Image.open("Tests/images/hopper_mask.ico") as im:
assert_image_equal_tofile(im, "Tests/images/hopper_mask.png")
def test_black_and_white():
with Image.open("Tests/images/black_and_white.ico") as im:
assert im.mode == "RGBA"

2
src/PIL/IcoImagePlugin.py
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@ -235,8 +235,8 @@ class IcoFile:
# the total mask data is
# padded row size * height / bits per char
and_mask_offset = o + int(im.size[0] * im.size[1] * (bpp / 8.0))
total_bytes = int((w * im.size[1]) / 8)
and_mask_offset = header["offset"] + header["size"] - total_bytes
self.buf.seek(and_mask_offset)
mask_data = self.buf.read(total_bytes)