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If pasting an image onto itself at a lower position, copy from bottom

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This commit is contained in:
Andrew Murray 2025-04-11 22:26:42 +10:00
parent c8d98d56a0
commit 79f834ef65
2 changed files with 20 additions and 2 deletions
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12
Tests/test_image_paste.py
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@ -124,6 +124,18 @@ class TestImagingPaste:
im = im.crop((12, 23, im2.width + 12, im2.height + 23))
assert_image_equal(im, im2)
@pytest.mark.parametrize("y", [10, -10])
def test_image_self(self, y: int) -> None:
im = self.gradient_RGB
im_self = im.copy()
im_self.paste(im_self, (0, y))
im_copy = im.copy()
im_copy.paste(im_copy.copy(), (0, y))
assert_image_equal(im_self, im_copy)
@pytest.mark.parametrize("mode", ["RGBA", "RGB", "L"])
def test_image_mask_1(self, mode: str) -> None:
im = Image.new(mode, (200, 200), "white")

10
src/libImaging/Paste.c
View File

@ -44,8 +44,14 @@ paste(
xsize *= pixelsize;
for (y = 0; y < ysize; y++) {
memcpy(imOut->image[y + dy] + dx, imIn->image[y + sy] + sx, xsize);
if (imOut == imIn && dy > sy) {
for (y = ysize - 1; y >= 0; y--) {
memcpy(imOut->image[y + dy] + dx, imIn->image[y + sy] + sx, xsize);
}
} else {
for (y = 0; y < ysize; y++) {
memcpy(imOut->image[y + dy] + dx, imIn->image[y + sy] + sx, xsize);
}
}
}