#include <u.h>#include <libc.h>#include <libg.h>#include <fb.h>void filter(uchar *, uchar *, uchar *, int, int);uchar inline[3][8192*8];uchar outline[8192*8];input(PICFILE *in, uchar *l, uchar *m){	int i;	if(!picread(in, (char *)l)){		memcpy((char *)l-in->nchan, (char *)m-in->nchan,			PIC_NCHAN(in)*(PIC_WIDTH(in)+2));		return;	}	m=l+PIC_NCHAN(in)*PIC_WIDTH(in);	for(i=0;i!=PIC_NCHAN(in);i++,l++,m++){		l[-PIC_NCHAN(in)]=l[0];		m[0]=m[-PIC_NCHAN(in)];	}}main(int argc, char *argv[]){	int y;	uchar *l0, *l1, *l2, *t;	PICFILE *in, *out;	argc=getflags(argc, argv, "");	if(argc!=1 && argc!=2) usage("[picture]");	in=picopen_r(argc==2?argv[1]:"IN");	if(in==0){		perror(argc==2?argv[1]:"IN");		exits("open input");	}	out=picopen_w("OUT", PIC_SAMEARGS(in));	if(out==0){		perror("OUT");		exits("create output");	}	l0=inline[0]+in->nchan;	l1=inline[1]+in->nchan;	l2=inline[2]+in->nchan;	input(in, l0, l0);	memcpy((char *)l1, (char *)l0, PIC_NCHAN(in)*(PIC_WIDTH(in)+2));	for(y=0;y!=PIC_HEIGHT(in);y++){		input(in, l2, l1);		filter(l0, l1, l2, PIC_NCHAN(in), PIC_WIDTH(in));		picwrite(out, (char *)outline);		t=l0;		l0=l1;		l1=l2;		l2=t;	}	exits(0);}