@@ -233,6 +233,10 @@ static void draw_mandelbrot(AVFilterContext *ctx, uint32_t *color, int linesize,

             use_zyklus= (x==0 || mb->inner!=BLACK ||color[x-1 + y*linesize] == 0xFF000000);

+#define Z_Z2_C(outr,outi,inr,ini)\

+            outr= inr*inr - ini*ini + cr;\

+            outi= 2*inr*ini + ci;

+

             for(i=0; i<mb->maxiter; i++){

                 double t;

                 if(zr*zr + zi*zi > mb->bailout){

@@ -243,15 +247,13 @@ static void draw_mandelbrot(AVFilterContext *ctx, uint32_t *color, int linesize,

                     c= lrintf((sin(zr)+1)*127) + lrintf((sin(zr/1.234)+1)*127)*256*256 + lrintf((sin(zr/100)+1)*127)*256;

                     break;

                 }

-                t= zr*zr - zi*zi + cr;

-                zi= 2*zr*zi + ci;

+                Z_Z2_C(t, zi, zr, zi)

                 if(use_zyklus){

                     mb->zyklus[i][0]= t;

                     mb->zyklus[i][1]= zi;

                 }

                 i++;

-                zr= t*t - zi*zi+cr;

-                zi= 2*t*zi + ci;

+                Z_Z2_C(zr, zi, t, zi)

                 if(use_zyklus){

                     if(mb->zyklus[i>>1][0]==zr && mb->zyklus[i>>1][1]==zi)

                         break;