vsrc_mandelbrot: simplify second bailout search by not recalculating values.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavfilter/vsrc_mandelbrot.c

@@ -264,25 +264,22 @@ static void draw_mandelbrot(AVFilterContext *ctx, uint32_t *color, int linesize,
                 Z_Z2_C_ZYKLUS(t, zi, zr, zi, 0)
                 i++;
                 Z_Z2_C_ZYKLUS(zr, zi, t, zi, 1)
-                if(zr*zr + zi*zi > mb->bailout)
-                    break;
-            }
+                if(zr*zr + zi*zi > mb->bailout){
                     i-= FFMIN(7, i);
+                    for(; i<mb->maxiter; i++){
                         zr= mb->zyklus[i][0];
                         zi= mb->zyklus[i][1];
-            for(; i<mb->maxiter; i++){
-                double t;
                         if(zr*zr + zi*zi > mb->bailout){
                             switch(mb->outer){
-                    case            ITERATION_COUNT: zr = i - (SQR(zr-cr)+SQR(zi-ci) > SQR(mb->bailout)); break;
+                            case            ITERATION_COUNT: zr = i; break;
                             case NORMALIZED_ITERATION_COUNT: zr= i + log2(log(mb->bailout) / log(zr*zr + zi*zi)); break;
                             }
                             c= lrintf((sin(zr)+1)*127) + lrintf((sin(zr/1.234)+1)*127)*256*256 + lrintf((sin(zr/100)+1)*127)*256;
                             break;
                         }
-                Z_Z2_C_ZYKLUS(t, zi, zr, zi, 0)
-                i++;
-                Z_Z2_C_ZYKLUS(zr, zi, t, zi, 1)
+                    }
+                    break;
+                }
             }
             if(!c){
                 if(mb->inner==PERIOD){