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mandelbrot: Only use cycle detection if previous pixel was an interior pixel 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-11-12 16:33:56 +01:00
parent 50b8f9388a
commit 6c5dd858b4
1 changed files with 8 additions and 5 deletions
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13
libavfilter/vsrc_mandelbrot.c
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@ -159,7 +159,7 @@ static void draw_mandelbrot(AVFilterContext *ctx, uint32_t *color, int linesize,
MBContext *mb = ctx->priv;
int x,y,i, in_cidx=0, next_cidx=0, tmp_cidx;
double scale= mb->start_scale*pow(mb->end_scale/mb->start_scale, pts/mb->end_pts);
int use_zyklus=0;
fill_from_cache(ctx, NULL, &in_cidx, NULL, mb->start_y+scale*(-mb->h/2-0.5), scale);
for(y=0; y<mb->h; y++){
const double ci=mb->start_y+scale*(y-mb->h/2);
@ -190,11 +190,14 @@ static void draw_mandelbrot(AVFilterContext *ctx, uint32_t *color, int linesize,
t= zr*zr - zi*zi;
zi= 2*zr*zi + ci;
zr= t + cr;
if(i && mb->zyklus[i>>1][0]==zr && mb->zyklus[i>>1][1]==zi)
break;
mb->zyklus[i][0]= zr;
mb->zyklus[i][1]= zi;
if(use_zyklus){
if(i && mb->zyklus[i>>1][0]==zr && mb->zyklus[i>>1][1]==zi)
break;
mb->zyklus[i][0]= zr;
mb->zyklus[i][1]= zi;
}
}
use_zyklus = !c;
c |= 0xFF000000;
color[x + y*linesize]= c;
if(next_cidx < mb->cache_allocated){