#include <u.h>#include <libc.h>#include <draw.h>#include <memdraw.h>#include <pool.h> static int invert = 0; voidmain(int argc, char **argv){	Memimage *im, *om;	char *s;	ulong ofmt; 	ofmt = 0;	ARGBEGIN{	case 'i':		invert = 1;		break;	case 'c':		s = ARGF();		if(s==nil)			break;		ofmt = strtochan(s);		if(ofmt == 0){			fprint(2, "cvbit: bad chan: %s\n", s);			exits("chan");		}		break;	}ARGEND 	memimageinit();	im = readmemimage(0);	if(im == nil){		fprint(2, "cvbit: can't read image: %r\n");		exits("read");	}	if(ofmt){		om = allocmemimage(im->r, ofmt);		if(om == nil){			fprint(2, "cvbit: can't allocate new image: %r\n");			exits("alloc");		}		memimagedraw(om, om->r, im, im->r.min, nil, ZP, S);	}else		om = im;	if(invert){		uchar *buf;		int bpl, y, x; 		bpl = bytesperline(om->r, om->depth);		buf = malloc(bpl);		for(y=om->r.min.y; y<om->r.max.y; y++){			if(unloadmemimage(om, Rpt(Pt(om->r.min.x,y), Pt(om->r.max.x,y+1)), buf, bpl) != bpl){				fprint(2, "cvbit: can't unload image line\n");				exits("unload");			}			for(x=0; x<bpl; x++)				buf[x] ^= 0xFF;			if(loadmemimage(om, Rpt(Pt(om->r.min.x,y), Pt(om->r.max.x,y+1)), buf, bpl) != bpl){				fprint(2, "cvbit: can't load image line\n");				exits("load");			}		}	}	if(writememimage(1, om) < 0){		fprint(2, "cvbit: can't write image: %r\n");		exits("write");	}	exits(nil);} char*poolname(Pool *p){	USED(p);	return "none";} voidpoolsetcompact(Pool *p, void (*f)(void*, void*)){	USED(p);	USED(f);}