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dither: don't use long double 

This fixes compilation with broken libcs, like on Cygwin. C99
absolutely requires long double and associated functions like expl,
even if long double is double. But newlib (used by cygwin) omits
declaration for these if long double is equivalent to double.

The extra precision is not needed here, so remove it to make life
easier for the single person using mpv with cygwin.
This commit is contained in:
wm4 2013-07-05 20:26:32 +02:00
parent 0d6f5fbe54
commit 1709b65a72
1 changed files with 2 additions and 2 deletions
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4
video/out/dither.c
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@ -79,14 +79,14 @@ static void makegauss(struct ctx *k, unsigned int sizeb)
for (index_t c = 0; c < k->size2; c++) for (index_t c = 0; c < k->size2; c++)
k->gauss[c] = 0; k->gauss[c] = 0;
long double sigma = -logl(1.5 / UINT64_MAX * gauss_size2) / k->gauss_radius; double sigma = -log(1.5 / UINT64_MAX * gauss_size2) / k->gauss_radius;
for (index_t gy = 0; gy <= k->gauss_radius; gy++) { for (index_t gy = 0; gy <= k->gauss_radius; gy++) {
for (index_t gx = 0; gx <= gy; gx++) { for (index_t gx = 0; gx <= gy; gx++) {
int cx = (int)gx - k->gauss_radius; int cx = (int)gx - k->gauss_radius;
int cy = (int)gy - k->gauss_radius; int cy = (int)gy - k->gauss_radius;
int sq = cx * cx + cy * cy; int sq = cx * cx + cy * cy;
long double e = expl(-sqrtl(sq) * sigma); double e = exp(-sqrt(sq) * sigma);
uint64_t v = e / gauss_size2 * UINT64_MAX; uint64_t v = e / gauss_size2 * UINT64_MAX;
k->gauss[XY(k, gx, gy)] = k->gauss[XY(k, gx, gy)] =
k->gauss[XY(k, gy, gx)] = k->gauss[XY(k, gy, gx)] =