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mandelbrot: allow visualizing the period of converged points.

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-11-13 19:28:24 +01:00
parent e8499ab171
commit 08dadd331f
1 changed files with 12 additions and 1 deletions
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13
libavfilter/vsrc_mandelbrot.c
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@ -39,6 +39,7 @@ enum Outer{
enum Inner{
BLACK,
PERIOD,
};
typedef struct Point {
@ -185,7 +186,7 @@ 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);
use_zyklus= (x==0 || mb->inner!=BLACK ||color[x-1 + y*linesize] == 0xFF000000);
for(i=0; i<mb->maxiter; i++){
double t;
@ -213,6 +214,16 @@ static void draw_mandelbrot(AVFilterContext *ctx, uint32_t *color, int linesize,
mb->zyklus[i][1]= zi;
}
}
if(!c && mb->inner==PERIOD){
int j;
for(j=i-1; j; j--)
if(SQR(mb->zyklus[j][0]-zr) + SQR(mb->zyklus[j][1]-zi) < 0.0000000000000001)
break;
if(j){
c= i-j;
c= ((c<<5)&0xE0) + ((c<<16)&0xE000) + ((c<<27)&0xE00000);
}
}
c |= 0xFF000000;
color[x + y*linesize]= c;
if(next_cidx < mb->cache_allocated){