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vsrc_mandelbrot: factorize main calculation out into a macro. 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-11-19 13:51:44 +01:00
parent 0af8d20755
commit cf670fbc96
1 changed files with 6 additions and 4 deletions
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10
libavfilter/vsrc_mandelbrot.c
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@ -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;