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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <imhdr.h>
# IMA_SUB -- Image arithmetic subtraction.
$for (silrd)
procedure ima_sub$t (im_a, im_b, im_c, a, b)
pointer im_a, im_b, im_c
PIXEL a, b
int len
pointer im[3], buf[3]
long v[IM_MAXDIM, 3]
int ima_nl$t()
begin
# Loop through all of the image lines.
im[1] = im_c
len = IM_LEN (im[1], 1)
call amovkl (long(1), v, 3 * IM_MAXDIM)
# If imagea is constant then read imageb. Do a vector/scalar
# subtraction and then negate the result.
if (im_a == NULL) {
im[2] = im_b
while (ima_nl$t (im, buf, v, 2) != EOF) {
if (a != 0$f) {
call asubk$t (Mem$t[buf[2]], a, Mem$t[buf[1]], len)
call aneg$t (Mem$t[buf[1]], Mem$t[buf[1]], len)
} else
call aneg$t (Mem$t[buf[2]], Mem$t[buf[1]], len)
}
# If imageb is constant then read imagea and do a vector/scalar
# subtraction to imagec.
} else if (im_b == NULL) {
im[2] = im_a
while (ima_nl$t (im, buf, v, 2) != EOF) {
if (b == 0$f)
call amov$t (Mem$t[buf[2]], Mem$t[buf[1]], len)
else
call asubk$t (Mem$t[buf[2]], b, Mem$t[buf[1]], len)
}
# Read imagea and imageb and do a vector subtraction into imagec.
} else {
im[2] = im_a
im[3] = im_b
while (ima_nl$t (im, buf, v, 3) != EOF)
call asub$t (Mem$t[buf[2]], Mem$t[buf[3]], Mem$t[buf[1]], len)
}
end
$endfor
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