diff options
| author | Michael Niedermayer <michaelni@gmx.at> | 2011-11-19 23:28:56 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2011-11-19 23:28:56 +0100 |
| commit | 690860d0d55be4af0242a7664fb78b471e391c9b (patch) | |
| tree | cc2217cb105481bd191ca6aee06e1142df159a64 /libavfilter/vsrc_mandelbrot.c | |
| parent | a5dfedd3814f742a0e7f0bf3112f664f3c5649bd (diff) | |
vsrc_mandelbrot: Use threshold to detect cycles.
This way cycles are detected much earlier.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavfilter/vsrc_mandelbrot.c')
| -rw-r--r-- | libavfilter/vsrc_mandelbrot.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/libavfilter/vsrc_mandelbrot.c b/libavfilter/vsrc_mandelbrot.c index 629fae1b69..3a9f9619e6 100644 --- a/libavfilter/vsrc_mandelbrot.c +++ b/libavfilter/vsrc_mandelbrot.c @@ -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;\ |