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vsrc_mandelbrot: check bailout only once every 8 iterations, this is around 10% faster.

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-11-19 14:15:56 +01:00
parent fe2efc5264
commit 649d3932db
1 changed files with 24 additions and 1 deletions
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25
libavfilter/vsrc_mandelbrot.c
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@ -247,7 +247,30 @@ static void draw_mandelbrot(AVFilterContext *ctx, uint32_t *color, int linesize,
}
for(i=0; i<mb->maxiter; i++){
for(i=0; i<mb->maxiter-8; i++){
double t;
Z_Z2_C_ZYKLUS(t, zi, zr, zi, 0)
i++;
Z_Z2_C_ZYKLUS(zr, zi, t, zi, 1)
i++;
Z_Z2_C_ZYKLUS(t, zi, zr, zi, 0)
i++;
Z_Z2_C_ZYKLUS(zr, zi, t, zi, 1)
i++;
Z_Z2_C_ZYKLUS(t, zi, zr, zi, 0)
i++;
Z_Z2_C_ZYKLUS(zr, zi, t, zi, 1)
i++;
Z_Z2_C_ZYKLUS(t, zi, zr, zi, 0)
i++;
Z_Z2_C_ZYKLUS(zr, zi, t, zi, 1)
if(zr*zr + zi*zi > mb->bailout)
break;
}
i-= FFMIN(7, i);
zr= mb->zyklus[i][0];
zi= mb->zyklus[i][1];
for(; i<mb->maxiter; i++){
double t;
if(zr*zr + zi*zi > mb->bailout){
switch(mb->outer){