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include <mach.h>
include <imhdr.h>
include "epix.h"
# EP_REPLACE -- Replace all pixels that are ==, <=, or >= to the value at the
# reference pixel. Since this allocates and gets sections this may result in
# the entire image being put into memory with potential memory problems. It
# is intended for use with masks that have regions of constant values.
#
# Note that this version assumes the pixel values may be ACE object masks.
$for (ir)
procedure ep_replace$t (ep, x, y, key)
pointer ep #I EPIX pointer
int x, y #I Reference pixel
int key #I Key
int i, j, nc, nl, x1, x2, y1, y2
real minv, maxv
PIXEL val, ival, oval
pointer im, buf
$if (datatype == i)
int andi()
$endif
pointer imgs2$t(), imps2$t()
errchk imgs2$t, imps2$t
begin
im = EP_IM(ep)
nc = IM_LEN(im,1)
nl = IM_LEN(im,2)
EP_INDATA(ep) = NULL
EP_OUTDATA(ep) = NULL
if (x < 1 || x > nc || y < 1 || y > nl) {
call eprintf ("Pixel out of bounds\n")
return
}
# Get reference pixel value and replacement value.
buf = imgs2$t (im, x, x, y, y)
$if (datatype == i)
ival = andi (Mem$t[buf], 0777777B)
$else
ival = Mem$t[buf]
$endif
oval = EP_VALUE(ep)
minv = EP_MINVALUE(ep)
maxv = EP_MAXVALUE(ep)
if (IS_INDEFR(minv))
minv = -MAX_REAL
if (IS_INDEFR(maxv))
minv = MAX_REAL
# This requires two passes to fit into the subraster model.
# First pass finds the limits of the change and the second
# makes the change.
x1 = x+1; x2 = x-1; y1 = y+1; y2 = y-1
do j = 1, nl {
buf = imgs2$t (im, 1, nc, j, j)
switch (key) {
case '=':
do i = 1, nc {
$if (datatype == i)
val = andi (Mem$t[buf+i-1], 0777777B)
$else
val = Mem$t[buf+i-1]
$endif
if (val != ival || val == oval || val < minv || val > maxv)
next
x1 = min (x1, i)
x2 = max (x2, i)
y1 = min (y1, j)
y2 = max (y2, j)
}
case '<':
do i = 1, nc {
$if (datatype == i)
val = andi (Mem$t[buf+i-1], 0777777B)
$else
val = Mem$t[buf+i-1]
$endif
if (val > ival || val == oval || val < minv || val > maxv)
next
x1 = min (x1, i)
x2 = max (x2, i)
y1 = min (y1, j)
y2 = max (y2, j)
}
case '>':
do i = 1, nc {
$if (datatype == i)
val = andi (Mem$t[buf+i-1], 0777777B)
$else
val = Mem$t[buf+i-1]
$endif
if (val < ival || val == oval || val < minv || val > maxv)
next
x1 = min (x1, i)
x2 = max (x2, i)
y1 = min (y1, j)
y2 = max (y2, j)
}
}
}
# No pixels to change.
if (x2 < x1 || y2 < y1)
return
# Set the rasters and change the pixels.
EP_X1(ep) = x1
EP_X2(ep) = x2
EP_Y1(ep) = y1
EP_Y2(ep) = y2
EP_NX(ep) = EP_X2(ep) - EP_X1(ep) + 1
EP_NY(ep) = EP_Y2(ep) - EP_Y1(ep) + 1
EP_NPTS(ep) = EP_NX(ep) * EP_NY(ep)
EP_OUTDATA(ep) = imps2$t (im, EP_X1(ep), EP_X2(ep), EP_Y1(ep),
EP_Y2(ep))
EP_INDATA(ep) = imgs2$t (im, EP_X1(ep), EP_X2(ep), EP_Y1(ep),
EP_Y2(ep))
buf = EP_OUTDATA(ep)
call amov$t (Mem$t[EP_INDATA(ep)], Mem$t[buf], EP_NPTS(ep))
switch (key) {
case '=':
do i = 1, EP_NPTS(ep) {
$if (datatype == i)
val = andi (Mem$t[buf], 0777777B)
$else
val = Mem$t[buf]
$endif
if (val == ival && val >= minv && val <= maxv)
Mem$t[buf] = oval
buf = buf + 1
}
case '<':
do i = 1, EP_NPTS(ep) {
$if (datatype == i)
val = andi (Mem$t[buf], 0777777B)
$else
val = Mem$t[buf]
$endif
if (val <= ival && val >= minv && val <= maxv)
Mem$t[buf] = oval
buf = buf + 1
}
case '>':
do i = 1, EP_NPTS(ep) {
$if (datatype == i)
val = andi (Mem$t[buf], 0777777B)
$else
val = Mem$t[buf]
$endif
if (val >= ival && val >= minv && val <= maxv)
Mem$t[buf] = oval
buf = buf + 1
}
}
end
$endfor
|
