python-pillow/Pillow
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nearest and copy ROI

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This commit is contained in:
homm 2016-11-24 05:12:41 +03:00
parent f828416752
commit 338610b112
2 changed files with 24 additions and 3 deletions
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19
Tests/test_image_resample.py
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@ -378,6 +378,25 @@ class CoreResampleRoiTest(PillowTestCase):
with self.assertRaisesRegexp(ValueError, "can't exceed"):
im.resize((32, 32), resample, (0, 0, im.width, im.height + 1))
def test_tiles(self):
im = hopper()
# should not be fractional
size = (28, 14)
sc = (3, 4) # scale
o = (5, 10) # offset
# fixed size divisible by scale
im = im.resize((im.width // sc[0] * sc[0],
im.height // sc[1] * sc[1]))
for resample in (Image.LINEAR, Image.BOX, Image.BILINEAR, Image.HAMMING,
Image.BICUBIC, Image.LANCZOS):
roi = (o[0] * sc[0], o[1] * sc[1],
(o[0] + size[0]) * sc[0], (o[1] + size[1]) * sc[1])
tile1 = im.resize(size, resample, roi)
big_size = (im.width // sc[0], im.height // sc[1])
tile2 = im.resize(big_size, resample)\
.crop(o + (o[0] + size[0], o[1] + size[1]))
if __name__ == '__main__':
unittest.main()

8
_imaging.c
View File

@ -1560,15 +1560,17 @@ _resize(ImagingObject* self, PyObject* args)
return ImagingError_ValueError("region of interest can't be empty");
}
if (imIn->xsize == xsize && imIn->ysize == ysize) {
if (roi[0] == 0 && roi[1] == 0 && roi[2] == xsize && roi[3] == ysize) {
imOut = ImagingCopy(imIn);
}
else if (filter == IMAGING_TRANSFORM_NEAREST) {
double a[6];
memset(a, 0, sizeof a);
a[0] = (double) imIn->xsize / xsize;
a[4] = (double) imIn->ysize / ysize;
a[0] = (double) (roi[2] - roi[0]) / xsize;
a[4] = (double) (roi[3] - roi[1]) / ysize;
a[2] = roi[0];
a[5] = roi[1];
imOut = ImagingNew(imIn->mode, xsize, ysize);