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swscale/utils: replace pow by exp2

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exp2 is a faster function.

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
This commit is contained in:
Ganesh Ajjanagadde 2015-12-07 23:05:05 -05:00
parent 42868ca569
commit c8905e0d67
1 changed files with 2 additions and 1 deletions
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3
libswscale/utils.c
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@ -45,6 +45,7 @@
#include "libavutil/cpu.h"
#include "libavutil/imgutils.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/libm.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
@ -451,7 +452,7 @@ static av_cold int initFilter(int16_t **outFilter, int32_t **filterPos,
coeff *= fone >> (30 + 16);
} else if (flags & SWS_GAUSS) {
double p = param[0] != SWS_PARAM_DEFAULT ? param[0] : 3.0;
coeff = (pow(2.0, -p * floatd * floatd)) * fone;
coeff = exp2(-p * floatd * floatd) * fone;
} else if (flags & SWS_SINC) {
coeff = (d ? sin(floatd * M_PI) / (floatd * M_PI) : 1.0) * fone;
} else if (flags & SWS_LANCZOS) {