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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# XT_LSUM -- Sum lines
+#
+# A new sum vector is created when the data pointer is null or if the number
+# of columns is changed. If the previous sum overlaps the requested sum then
+# additions and subtractions are performed on the previous sum to minimize
+# the number of arithmetic operations.
+
+procedure xt_lsum (im, col1, col2, line1, line2, data)
+
+pointer im # IMIO pointer
+int col1, col2 # Column limits of the sum
+int line1, line2 # Line limits
+pointer data # Data pointer
+
+int i
+int ncols, nlines, nc, nl, c1, c2, l1, l2
+pointer j
+
+pointer imgs2r()
+
+begin
+ ncols = col2 - col1 + 1
+ nlines = line2 - line1 + 1
+
+ if ((data == NULL) || (ncols != nc)) {
+ call mfree (data, TY_REAL)
+ call malloc (data, ncols, TY_REAL)
+ nc = ncols
+ l1 = 0
+ l2 = 0
+ }
+
+ if (nlines != nl) {
+ nl = nlines
+ l1 = 0
+ l2 = 0
+ }
+
+ # If only one line then don't bother with summing.
+
+ if (nlines == 1) {
+ if ((line1 != l1) || (col1 != c1) || (col2 != c2)) {
+ c1 = col1
+ c2 = col2
+ l1 = line1
+ l2 = line2
+ j = imgs2r (im, c1, c2, l1, l2)
+ call amovr (Memr[j], Memr[data], nc)
+ }
+ return
+ }
+
+ # If the sum limits are outside the last sum limits then form
+ # the sums from scratch.
+
+ if ((line1 > l2) || (line2 < l1) || (col1 != c1) || (col2 != c2)) {
+ c1 = col1
+ c2 = col2
+ l1 = line1
+ l2 = line2
+ call aclrr (Memr[data], nc)
+ do i = l1, l2 {
+ j = imgs2r (im, c1, c2, i, i)
+ call aaddr (Memr[data], Memr[j], Memr[data], nc)
+ }
+
+ # If the sum limits overlap then add and subtract to compute the
+ # new sums from the previous sums. This minimizes the number of
+ # arithmetic operations in common applications.
+
+ } else if (line1 > l1) {
+ do i = l1, line1 - 1 {
+ j = imgs2r (im, c1, c2, i, i)
+ call asubr (Memr[data], Memr[j], Memr[data], nc)
+ }
+ do i = l2 + 1, line2 {
+ j = imgs2r (im, c1, c2, i, i)
+ call aaddr (Memr[data], Memr[j], Memr[data], nc)
+ }
+ l1 = line1
+ l2 = line2
+
+ } else {
+ do i = line2 + 1, l2 {
+ j = imgs2r (im, c1, c2, i, i)
+ call asubr (Memr[data], Memr[j], Memr[data], nc)
+ }
+ do i = line1, l1 - 1 {
+ j = imgs2r (im, c1, c2, i, i)
+ call aaddr (Memr[data], Memr[j], Memr[data], nc)
+ }
+ l1 = line1
+ l2 = line2
+ }
+end
+
+
+# XT_CSUM -- Sum columns
+#
+# A new sum vector is created when the data pointer is null or if the number
+# of lines is changed. If the previous sum overlaps the requested sum then
+# additions and subtractions are performed on the previous sum to minimize
+# the number of arithmetic operations.
+
+procedure xt_csum (co, col1, col2, line1, line2, data)
+
+pointer co # COIO pointer
+int col1, col2 # Column limits of the sum
+int line1, line2 # Line limits
+pointer data # Data pointer
+
+int i
+int ncols, nlines, nc, nl, c1, c2, l1, l2
+pointer j
+
+pointer cogetr()
+
+begin
+ ncols = col2 - col1 + 1
+ nlines = line2 - line1 + 1
+
+ if ((data == NULL) || (nlines != nl)) {
+ call mfree (data, TY_REAL)
+ call malloc (data, nlines, TY_REAL)
+ nl = nlines
+ c1 = 0
+ c2 = 0
+ }
+
+ if (ncols != nc) {
+ nc = ncols
+ c1 = 0
+ c2 = 0
+ }
+
+ # If only one column then don't bother with summing.
+
+ if (ncols == 1) {
+ if ((col1 != c1) || (line1 != l1) || (line2 != l2)) {
+ c1 = col1
+ c2 = col2
+ l1 = line1
+ l2 = line2
+ j = cogetr (co, c1, l1, l2)
+ call amovr (Memr[j], Memr[data], nl)
+ }
+ return
+ }
+
+ # If the sum limits are outside the last sum limits then form
+ # the sums from scratch.
+
+ if ((col1 > c2) || (col2 < c1) || (line1 != l1) || (line2 != l2)) {
+ c1 = col1
+ c2 = col2
+ l1 = line1
+ l2 = line2
+ call aclrr (Memr[data], nlines)
+ do i = c1, c2 {
+ j = cogetr (co, i, l1, l2)
+ call aaddr (Memr[data], Memr[j], Memr[data], nl)
+ }
+
+ # If the sum limits overlap then add and subtract to compute the
+ # new sums from the previous sums. This minimizes the number of
+ # arithmetic operations in common applications.
+
+ } else if (col1 > c1) {
+ do i = c1, col1 - 1 {
+ j = cogetr (co, i, l1, l2)
+ call asubr (Memr[data], Memr[j], Memr[data], nl)
+ }
+ do i = c2 + 1, col2 {
+ j = cogetr (co, i, l1, l2)
+ call aaddr (Memr[data], Memr[j], Memr[data], nl)
+ }
+ c1 = col1
+ c2 = col2
+
+ } else {
+ do i = col2 + 1, c2 {
+ j = cogetr (co, i, l1, l2)
+ call asubr (Memr[data], Memr[j], Memr[data], nl)
+ }
+ do i = col1, c1 - 1 {
+ j = cogetr (co, i, l1, l2)
+ call aaddr (Memr[data], Memr[j], Memr[data], nl)
+ }
+ c1 = col1
+ c2 = col2
+ }
+end
+
+
+# XT_LSUMB -- Sum lines with buffering
+#
+# A new sum vector is created when the data pointer is null or if the number
+# of columns is changed. If the previous sum overlaps the requested sum then
+# additions and subtractions are performed on the previous sum to minimize
+# the number of arithmetic operations. Buffering of previous lines is done.
+
+procedure xt_lsumb (im, col1, col2, line1, line2, data)
+
+pointer im # IMIO pointer
+int col1, col2 # Column limits of the sum
+int line1, line2 # Line limits
+pointer data # Data pointer
+
+int i
+int ncols, nlines, nc, nl, c1, c2, l1, l2
+pointer j
+
+pointer imgs2r()
+
+begin
+ ncols = col2 - col1 + 1
+ nlines = line2 - line1 + 1
+
+ if ((data == NULL) || (ncols != nc)) {
+ call mfree (data, TY_REAL)
+ call malloc (data, (nlines + 1) * ncols, TY_REAL)
+ nc = ncols
+ l1 = 0
+ l2 = 0
+ }
+
+ if (nlines != nl) {
+ nl = nlines
+ l1 = 0
+ l2 = 0
+ }
+
+ # If only one line then don't bother with summing.
+
+ if (nlines == 1) {
+ if ((line1 != l1) || (col1 != c1) || (col2 != c2)) {
+ c1 = col1
+ c2 = col2
+ l1 = line1
+ l2 = line2
+ j = imgs2r (im, c1, c2, l1, l2)
+ call amovr (Memr[j], Memr[data], nc)
+ }
+ return
+ }
+
+ # If the sum limits are outside the last sum limits then form
+ # the sums from scratch.
+
+ if ((line1 > l2) || (line2 < l1) || (col1 != c1) || (col2 != c2)) {
+ c1 = col1
+ c2 = col2
+ l1 = line1
+ l2 = line2
+ call aclrr (Memr[data], nc)
+ do i = l1, l2 {
+ j = data + (mod (i, nl) + 1) * nc
+ call amovr (Memr[imgs2r (im, c1, c2, i, i)], Memr[j], nc)
+ call aaddr (Memr[data], Memr[j], Memr[data], nc)
+ }
+
+ # If the sum limits overlap then add and subtract to compute the
+ # new sums from the previous sums. This minimizes the number of
+ # arithmetic operations in common applications.
+
+ } else if (line1 > l1) {
+ do i = l1, line1 - 1 {
+ j = data + (mod (i, nl) + 1) * nc
+ call asubr (Memr[data], Memr[j], Memr[data], nc)
+ }
+ do i = l2 + 1, line2 {
+ j = data + (mod (i, nl) + 1) * nc
+ call amovr (Memr[imgs2r (im, c1, c2, i, i)], Memr[j], nc)
+ call aaddr (Memr[data], Memr[j], Memr[data], nc)
+ }
+ l1 = line1
+ l2 = line2
+
+ } else {
+ do i = line2 + 1, l2 {
+ j = data + (mod (i, nl) + 1) * nc
+ call asubr (Memr[data], Memr[j], Memr[data], nc)
+ }
+ do i = line1, l1 - 1 {
+ j = data + (mod (i, nl) + 1) * nc
+ call amovr (Memr[imgs2r (im, c1, c2, i, i)], Memr[j], nc)
+ call aaddr (Memr[data], Memr[j], Memr[data], nc)
+ }
+ l1 = line1
+ l2 = line2
+ }
+end
+
+
+# XT_CSUMB -- Sum columns with buffering
+#
+# A new sum vector is created when the data pointer is null or if the number
+# of lines is changed. If the previous sum overlaps the requested sum then
+# additions and subtractions are performed on the previous sum to minimize
+# the number of arithmetic operations. Buffering is done on the previous cols.
+
+procedure xt_csumb (co, col1, col2, line1, line2, data)
+
+pointer co # COIO pointer
+int col1, col2 # Column limits of the sum
+int line1, line2 # Line limits
+pointer data # Data pointer
+
+int i
+int ncols, nlines, nc, nl, c1, c2, l1, l2
+pointer j
+
+pointer cogetr()
+
+begin
+ ncols = col2 - col1 + 1
+ nlines = line2 - line1 + 1
+
+ if ((data == NULL) || (nlines != nl)) {
+ call mfree (data, TY_REAL)
+ call malloc (data, (ncols + 1) * nlines, TY_REAL)
+ nl = nlines
+ c1 = 0
+ c2 = 0
+ }
+
+ if (ncols != nc) {
+ nc = ncols
+ c1 = 0
+ c2 = 0
+ }
+
+ # If only one column then don't bother with summing.
+
+ if (ncols == 1) {
+ if ((col1 != c1) || (line1 != l1) || (line2 != l2)) {
+ c1 = col1
+ c2 = col2
+ l1 = line1
+ l2 = line2
+ j = cogetr (co, c1, l1, l2)
+ call amovr (Memr[j], Memr[data], nl)
+ }
+ return
+ }
+
+ # If the sum limits are outside the last sum limits then form
+ # the sums from scratch.
+
+ if ((col1 > c2) || (col2 < c1) || (line1 != l1) || (line2 != l2)) {
+ c1 = col1
+ c2 = col2
+ l1 = line1
+ l2 = line2
+ call aclrr (Memr[data], nlines)
+ do i = c1, c2 {
+ j = data + (mod (i, nc) + 1) * nl
+ call amovr (Memr[cogetr (co, i, l1, l2)], Memr[j], nl)
+ call aaddr (Memr[data], Memr[j], Memr[data], nl)
+ }
+
+ # If the sum limits overlap then add and subtract to compute the
+ # new sums from the previous sums. This minimizes the number of
+ # arithmetic operations in common applications.
+
+ } else if (col1 > c1) {
+ do i = c1, col1 - 1 {
+ j = data + (mod (i, nc) + 1) * nl
+ call asubr (Memr[data], Memr[j], Memr[data], nl)
+ }
+ do i = c2 + 1, col2 {
+ j = data + (mod (i, nc) + 1) * nl
+ call amovr (Memr[cogetr (co, i, l1, l2)], Memr[j], nl)
+ call aaddr (Memr[data], Memr[j], Memr[data], nl)
+ }
+ c1 = col1
+ c2 = col2
+
+ } else {
+ do i = col2 + 1, c2 {
+ j = data + (mod (i, nc) + 1) * nl
+ call asubr (Memr[data], Memr[j], Memr[data], nl)
+ }
+ do i = col1, c1 - 1 {
+ j = data + (mod (i, nc) + 1) * nl
+ call amovr (Memr[cogetr (co, i, l1, l2)], Memr[j], nl)
+ call aaddr (Memr[data], Memr[j], Memr[data], nl)
+ }
+ c1 = col1
+ c2 = col2
+ }
+end
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