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#include <string.h>
#include "plugin.h"
INFO("randomly move around pixels")
void perform_effect(_frame f, _args a)
{
int i, o=1000, x1, y1, x2, y2, range=10;
char *t;
pixel8 *p1, *p2;
pixel32 dot;
byte pixelsize=f.pixelformat/8;
if(f.pixelformat>32) return;
if(a.s)
{
o = atoi(a.s);
if(o==0) o=1000;
if(t = strstr(a.s, " "))
if((range = atoi(t+1))==0) return;
}
for(i=0; i<o; i++)
{
x1 = rand()%f.width;
y1 = rand()%f.height;
x2 = x1 + (rand()%(range*2) - range);
y2 = y1 + (rand()%(range*2) - range);
if(x2<0) x2=0;
if(x2>=f.width) x2=f.width-1;
if(y2<0) y2=0;
if(y2>=f.height) y2=f.height-1;
p1 = scanline(f, y1);
p2 = scanline(f, y2);
memcpy(&dot, &p2[x2*pixelsize], pixelsize);
memcpy(&p2[x2*pixelsize], &p1[x1*pixelsize], pixelsize);
memcpy(&p1[x1*pixelsize], &dot, pixelsize);
}
}
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