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If present, only use alpha channel for bounding box #4454

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merged 2 commits into from Mar 5, 2020
Merged

If present, only use alpha channel for bounding box #4454

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b934b50
If an alpha channel is present, only use that to get bounding box
radarhere Feb 28, 2020
b888354
Document getbbox change for images with alpha [ci skip]
radarhere Mar 5, 2020
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37 changes: 20 additions & 17 deletions Tests/test_image_getbbox.py
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Expand Up @@ -10,29 +10,32 @@ def test_sanity():


def test_bbox():
def check(im, fill_color):
assert im.getbbox() is None

# 8-bit mode
im = Image.new("L", (100, 100), 0)
assert im.getbbox() is None
im.paste(fill_color, (10, 25, 90, 75))
assert im.getbbox() == (10, 25, 90, 75)

im.paste(255, (10, 25, 90, 75))
assert im.getbbox() == (10, 25, 90, 75)
im.paste(fill_color, (25, 10, 75, 90))
assert im.getbbox() == (10, 10, 90, 90)

im.paste(255, (25, 10, 75, 90))
assert im.getbbox() == (10, 10, 90, 90)
im.paste(fill_color, (-10, -10, 110, 110))
assert im.getbbox() == (0, 0, 100, 100)

im.paste(255, (-10, -10, 110, 110))
assert im.getbbox() == (0, 0, 100, 100)
# 8-bit mode
im = Image.new("L", (100, 100), 0)
check(im, 255)

# 32-bit mode
im = Image.new("RGB", (100, 100), 0)
assert im.getbbox() is None

im.paste(255, (10, 25, 90, 75))
assert im.getbbox() == (10, 25, 90, 75)
check(im, 255)

im.paste(255, (25, 10, 75, 90))
assert im.getbbox() == (10, 10, 90, 90)
for mode in ("RGBA", "RGBa"):
for color in ((0, 0, 0, 0), (127, 127, 127, 0), (255, 255, 255, 0)):
im = Image.new(mode, (100, 100), color)
check(im, (255, 255, 255, 255))

im.paste(255, (-10, -10, 110, 110))
assert im.getbbox() == (0, 0, 100, 100)
for mode in ("La", "LA", "PA"):
for color in ((0, 0), (127, 0), (255, 0)):
im = Image.new(mode, (100, 100), color)
check(im, (255, 255))
13 changes: 12 additions & 1 deletion src/libImaging/GetBBox.c
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Expand Up @@ -55,8 +55,19 @@ ImagingGetBBox(Imaging im, int bbox[4])
GETBBOX(image8, 0xff);
} else {
INT32 mask = 0xffffffff;
if (im->bands == 3)
if (im->bands == 3) {
((UINT8*) &mask)[3] = 0;
} else if (strcmp(im->mode, "RGBa") == 0 ||
strcmp(im->mode, "RGBA") == 0 ||
strcmp(im->mode, "La") == 0 ||
strcmp(im->mode, "LA") == 0 ||
strcmp(im->mode, "PA") == 0) {
#ifdef WORDS_BIGENDIAN
mask = 0x000000ff;
#else
mask = 0xff000000;
#endif
}
GETBBOX(image32, mask);
}

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