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add calloc explanation

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This commit is contained in:
homm 2016-06-03 12:51:58 +03:00
parent f09067e45e
commit 3b7923c09f
1 changed files with 4 additions and 2 deletions
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6
libImaging/Resample.c
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@ -91,7 +91,7 @@ ImagingPrecompute(int inSize, int outSize, struct filter *filterp,
/* determine support size (length of resampling filter) */ /* determine support size (length of resampling filter) */
support = filterp->support * filterscale; support = filterp->support * filterscale;
/* maximum number of coofs */ /* maximum number of coeffs */
kmax = (int) ceil(support) * 2 + 1; kmax = (int) ceil(support) * 2 + 1;
// check for overflow // check for overflow
@ -102,7 +102,9 @@ ImagingPrecompute(int inSize, int outSize, struct filter *filterp,
if (outSize > INT_MAX / (2 * sizeof(double))) if (outSize > INT_MAX / (2 * sizeof(double)))
return 0; return 0;
/* coefficient buffer */ /* coefficient buffer. kmax elements for each of outSize pixels.
Only xmax number of coefficients are initialized (xmax <= kmax),
other coefficients should be 0, so we are using calloc. */
kk = calloc(outSize * kmax, sizeof(double)); kk = calloc(outSize * kmax, sizeof(double));
if ( ! kk) if ( ! kk)
return 0; return 0;