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replace the excluding of zero coefficients with math power

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Alexander 2017-05-29 13:46:32 +03:00
parent ad883961ac
commit afc592ad7b
1 changed files with 4 additions and 17 deletions
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21
libImaging/Resample.c
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@ -168,10 +168,12 @@ precompute_coeffs(int inSize, int outSize, struct filter *filterp,
center = (xx + 0.5) * scale;
ww = 0.0;
ss = 1.0 / filterscale;
xmin = (int) floor(center - support);
// Round the value
xmin = (int) (center - support + 0.5);
if (xmin < 0)
xmin = 0;
xmax = (int) ceil(center + support);
// Round the value
xmax = (int) (center + support + 0.5);
if (xmax > inSize)
xmax = inSize;
xmax -= xmin;
@ -180,21 +182,6 @@ precompute_coeffs(int inSize, int outSize, struct filter *filterp,
double w = filterp->filter((x + xmin - center + 0.5) * ss);
k[x] = w;
ww += w;
// We can skip extreme coefficients if they are zeroes.
if (w == 0) {
// Skip from the start.
if (x == 0) {
// At next loop `x` will be 0.
x -= 1;
// But `w` will not be 0, because it based on `xmin`.
xmin += 1;
xmax -= 1;
} else if (x == xmax - 1) {
// Truncate the last coefficient for current `xx`.
xmax -= 1;
}
}
}
for (x = 0; x < xmax; x++) {
if (ww != 0.0)