VMOT
dwn = (2 * t.Halfline) | MOT | VMOT;
dwn = EM | MOT | VMOT;
*--j = *brabuf = (cnt * t.Halfline) | MOT | NMOT | VMOT;
*--j = *brabuf = (cnt * EM) / 2 | MOT | NMOT | VMOT;
drawbuf[j++] = MOT | VMOT | ((dy[k] >= 0) ?
j |= VMOT;
*pbp++ = MOT | VMOT | i;
*pbp++ = MOT | VMOT | NMOT | -i;
#define isvmot(n) ((n) & VMOT) /* must have tested MOT previously */
j |= VMOT;
*pbp++ = MOT | VMOT | i;
*pbp++ = MOT | VMOT | NMOT | -i;