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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.
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@ -79,14 +79,14 @@ static void makegauss(struct ctx *k, unsigned int sizeb)
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for (index_t c = 0; c < k->size2; c++)
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k->gauss[c] = 0;
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long double sigma = -logl(1.5 / UINT64_MAX * gauss_size2) / k->gauss_radius;
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double sigma = -log(1.5 / UINT64_MAX * gauss_size2) / k->gauss_radius;
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for (index_t gy = 0; gy <= k->gauss_radius; gy++) {
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for (index_t gx = 0; gx <= gy; gx++) {
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int cx = (int)gx - k->gauss_radius;
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int cy = (int)gy - k->gauss_radius;
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int sq = cx * cx + cy * cy;
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long double e = expl(-sqrtl(sq) * sigma);
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double e = exp(-sqrt(sq) * sigma);
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uint64_t v = e / gauss_size2 * UINT64_MAX;
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k->gauss[XY(k, gx, gy)] =
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k->gauss[XY(k, gy, gx)] =
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