/sys/src/libmemdraw/draw.c:374,380 - draw.c:374,380
  	uchar	*alpha;	/* is &ones when unused, never nil */
  	uchar	*grey;
  	ulong	*rgba;
- 	int	delta;	/* number of bytes to add to pointer to get next pixel to the right */
+ 	uintptr	delta;	/* number of bytes to add to pointer to get next pixel to the right */
  
  	/* used by boolcalc* for mask data */
  	uchar	*m;		/* ptr to mask data r.min byte; like p->bytermin */