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use ROI in precompute_coeffs

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This commit is contained in:
homm 2016-11-24 06:11:36 +03:00
parent a1fedc0f8a
commit ef787bc3f5
2 changed files with 4 additions and 2 deletions
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2
Tests/test_image_resample.py
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@ -397,6 +397,8 @@ class CoreResampleRoiTest(PillowTestCase):
tile2 = im.resize(big_size, resample)\ tile2 = im.resize(big_size, resample)\
.crop(o + (o[0] + size[0], o[1] + size[1])) .crop(o + (o[0] + size[0], o[1] + size[1]))
self.assert_image_equal(tile1, tile2)
if __name__ == '__main__': if __name__ == '__main__':
unittest.main() unittest.main()

4
libImaging/Resample.c
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@ -134,7 +134,7 @@ precompute_coeffs(int inSize, int in0, int in1, int outSize,
double *kk, *k; double *kk, *k;
/* prepare for horizontal stretch */ /* prepare for horizontal stretch */
filterscale = scale = (double) inSize / outSize; filterscale = scale = (double) (in1 - in0) / outSize;
if (filterscale < 1.0) { if (filterscale < 1.0) {
filterscale = 1.0; filterscale = 1.0;
} }
@ -163,7 +163,7 @@ precompute_coeffs(int inSize, int in0, int in1, int outSize,
} }
for (xx = 0; xx < outSize; xx++) { for (xx = 0; xx < outSize; xx++) {
center = (xx + 0.5) * scale; center = in0 + (xx + 0.5) * scale;
ww = 0.0; ww = 0.0;
ss = 1.0 / filterscale; ss = 1.0 / filterscale;
xmin = (int) floor(center - support); xmin = (int) floor(center - support);