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include <imhdr.h>
include <imset.h>
$for (silrdx)
# FIXCOL -- Linearly interpolate columns across a region.
procedure fixcol$t (image, x1, x2, y1, y2)
pointer image # Image pointer
int x1, x2, y1, y2 # Region to be fixed
int i, j, nx, ny
real f1, f2, scale
pointer a, b, c
pointer imgs2$t(), imps2$t()
begin
c = imps2$t (image, x1, x2, y1, y2)
nx = x2 - x1 + 1
ny = y2 - y1 + 1
if (x1 == 1) {
a = imgs2$t (image, x2 + 1, x2 + 1, y1, y2)
do i = 1, ny
call amovk$t (Mem$t[a + i - 1], Mem$t[c + (i - 1) * nx], nx)
} else if (x2 == IM_LEN (image, 1)) {
a = imgs2$t (image, x1 - 1, x1 - 1, y1, y2)
do i = 1, ny
call amovk$t (Mem$t[a + i - 1], Mem$t[c + (i - 1) * nx], nx)
} else {
call imseti (image, IM_NBUFS, 2)
a = imgs2$t (image, x1 - 1, x1 - 1, y1, y2)
b = imgs2$t (image, x2 + 1, x2 + 1, y1, y2)
do i = 1, ny {
f1 = Mem$t[a + i - 1]
f2 = Mem$t[b + i - 1]
scale = (f2 - f1) / (nx + 1)
do j = 1, nx
Mem$t[c + (i - 1) * nx + j - 1] = j * scale + f1
}
}
end
$endfor
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