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mandelbrot: use period detection depening on left pixel and not the 

previous calculated pixel, this is more accurate due to the last
calculated often being farther away.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-11-13 15:14:25 +01:00
parent 9117592549
commit 2fee131b9e
1 changed files with 2 additions and 1 deletions
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3
libavfilter/vsrc_mandelbrot.c
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@ -178,6 +178,8 @@ static void draw_mandelbrot(AVFilterContext *ctx, uint32_t *color, int linesize,
if(color[x + y*linesize] & 0xFF000000)
continue;
use_zyklus= (x==0 || color[x-1 + y*linesize] == 0xFF000000);
for(i=0; i<mb->maxiter; i++){
double t;
if(zr*zr + zi*zi > mb->bailout){
@ -198,7 +200,6 @@ static void draw_mandelbrot(AVFilterContext *ctx, uint32_t *color, int linesize,
mb->zyklus[i][1]= zi;
}
}
use_zyklus = !c;
c |= 0xFF000000;
color[x + y*linesize]= c;
if(next_cidx < mb->cache_allocated){