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vsrc_mandelbrot: Use threshold to detect cycles.

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This way cycles are detected much earlier.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-11-19 23:28:56 +01:00
parent a5dfedd381
commit 690860d0d5
1 changed files with 4 additions and 1 deletions
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5
libavfilter/vsrc_mandelbrot.c
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@ -279,6 +279,7 @@ static void draw_mandelbrot(AVFilterContext *ctx, uint32_t *color, int linesize,
}
for(x=0; x<mb->w; x++){
float epsilon;
const double cr=mb->start_x+scale*(x-mb->w/2);
double zr=cr;
double zi=ci;
@ -298,6 +299,8 @@ static void draw_mandelbrot(AVFilterContext *ctx, uint32_t *color, int linesize,
}
use_zyklus= (x==0 || mb->inner!=BLACK ||color[x-1 + y*linesize] == 0xFF000000);
if(use_zyklus)
epsilon= scale*1*sqrt(SQR(x-mb->w/2) + SQR(y-mb->h/2))/mb->w;
#define Z_Z2_C(outr,outi,inr,ini)\
outr= inr*inr - ini*ini + cr;\
@ -306,7 +309,7 @@ static void draw_mandelbrot(AVFilterContext *ctx, uint32_t *color, int linesize,
#define Z_Z2_C_ZYKLUS(outr,outi,inr,ini, Z)\
Z_Z2_C(outr,outi,inr,ini)\
if(use_zyklus){\
if(Z && mb->zyklus[i>>1][0]==outr && mb->zyklus[i>>1][1]==outi)\
if(Z && fabs(mb->zyklus[i>>1][0]-outr)+fabs(mb->zyklus[i>>1][1]-outi) <= epsilon)\
break;\
}\
mb->zyklus[i][0]= outr;\