#include <u.h>#include <libc.h>#include <draw.h> staticintunitsperline(Rectangle r, int d, int bitsperunit){	ulong l, t; 	if(r.min.x >= 0){		l = (r.max.x*d+bitsperunit-1)/bitsperunit;		l -= (r.min.x*d)/bitsperunit;	}else{			/* make positive before divide */		t = (-r.min.x*d+bitsperunit-1)/bitsperunit;		l = t+(r.max.x*d+bitsperunit-1)/bitsperunit;	}	return l;} intwordsperline(Rectangle r, int d){	return unitsperline(r, d, 8*sizeof(ulong));} intbytesperline(Rectangle r, int d){	return unitsperline(r, d, 8);}