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# snap common block
int sn_fd # device file descriptor
int sn_frame, sn_bitpl # save current iframe, iplane
int zbufsize # fio buffer size--save here
pointer lutp[3,LEN_IISFRAMES] # look up table storage
pointer ofmp[3] # rgb ofm tables
pointer grp[3] # graphics tables
pointer result[3] # rgb results
pointer answer # final answer
pointer input # input data
pointer zs # zoom/scrolled data; scratch
pointer grbit_on # graphics bit on
bool gr_in_use # graphics RAM not all zeroes
bool on[LEN_IISFRAMES] # if frames on at all
bool multi_frame # snap using >1 frame
short range[3] # range and offset for rgb
short offset[3]
short left[3,2,LEN_IISFRAMES] # left boundary of line
short right[3,2,LEN_IISFRAMES] # right boundary of line
short ysplit # split point for y
short prev_y # previous line read
short sn_start, sn_end # color range to snap
common / zsnap / sn_fd, sn_frame, sn_bitpl, zbufsize, lutp, ofmp, grp,
result, answer, input, zs, grbit_on, gr_in_use, on, multi_frame,
range, offset, left, right, ysplit, prev_y, sn_start, sn_end
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