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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <imhdr.h>
include <imset.h>
include <math/iminterp.h>
define NMARGIN 3
# SH_LINES -- Shift image lines.
#
# If an integer shift is given then do an efficient integer shift
# without datatype I/O conversions and using array move operators.
# If the shift is non-integer then use image interpolation.
procedure sh_lines (im1, im2, shift, boundary, constant, interpstr)
pointer im1 # Input image descriptor
pointer im2 # Output image descriptor
real shift # Shift in pixels
int boundary # Boundary extension type
real constant # Constant boundary extension
char interpstr[ARB] # Interpolation type
int i, nsinc, nincr, ncols, nimcols, nlines, nbpix, nmargin, interpolation
long v1[IM_MAXDIM], v2[IM_MAXDIM], vout[IM_MAXDIM]
real dx, deltax, cx
pointer sp, x, asi, junk, buf1, buf2
bool fp_equalr()
int imggsr(), impnlr(), asigeti()
begin
# Check for out of bounds shifts.
ncols = IM_LEN(im1, 1)
if (shift < -ncols || shift > ncols)
call error (0, "SHIFTLINES: Shift out of bounds")
# Compute the shift.
dx = abs (shift - int (shift))
if (fp_equalr (dx, 0.0))
deltax = 0.0
else if (shift > 0.0)
deltax = 1.0 - dx
else
deltax = dx
# Initialize the interpolation.
call asitype (interpstr, interpolation, nsinc, nincr, cx)
if (interpolation == II_LSINC || interpolation == II_SINC)
call asisinit (asi, II_LSINC, nsinc, 1, deltax - nint (deltax),
0.0)
else
call asisinit (asi, interpolation, nsinc, 1, cx, 0.0)
# Set up the image boundary conditions.
if (interpolation == II_SINC || interpolation == II_LSINC)
nmargin = asigeti (asi, II_ASINSINC)
else
nmargin = NMARGIN
nbpix = int (abs (shift) + 1.0) + nmargin
call imseti (im1, IM_TYBNDRY, boundary)
call imseti (im1, IM_NBNDRYPIX, nbpix)
call imsetr (im1, IM_BNDRYPIXVAL, constant)
# Allocate space for and set up the interpolation coordinates.
call smark (sp)
call salloc (x, 2 * ncols, TY_REAL)
deltax = deltax + nmargin
if (interpolation == II_DRIZZLE) {
do i = 1, ncols {
Memr[x+2*i-2] = i + deltax - 0.5
Memr[x+2*i-1] = i + deltax + 0.5
}
} else {
do i = 1, ncols
Memr[x+i-1] = i + deltax
}
# Initialize the input v vectors.
cx = 1. - nmargin - shift
if ((cx <= 0.0) && (! fp_equalr (dx, 0.0)))
v1[1] = long (cx) - 1
else
v1[1] = long (cx)
v2[1] = ncols - shift + nmargin + 1
nimcols = v2[1] - v1[1] + 1
do i = 2, IM_NDIM(im1) {
v1[i] = long (1)
v2[i] = long (1)
}
# Compute the number of output lines.
nlines = 1
do i = 2, IM_NDIM(im1)
nlines = nlines * IM_LEN(im1, i)
# Initialize the output v vector.
call amovkl (long(1), vout, IM_MAXDIM)
# Shift the images.
do i = 1, nlines {
# Get the input image data buffer.
buf1 = imggsr (im1, v1, v2, IM_NDIM(im1))
if (buf1 == EOF)
call error (0, "SHIFTLINES: Error reading input image\n")
# Get the output image data buffer.
junk = impnlr (im2, buf2, vout)
if (junk == EOF)
call error (0, "SHIFTLINES: Error writing output image\n")
# Evaluate the interpolation at the shifted points.
call asifit (asi, Memr[buf1], nimcols)
call asivector (asi, Memr[x], Memr[buf2], ncols)
# Increment the v vectors.
call sh_loop (v1, v2, IM_LEN(im1,1), IM_NDIM(im1))
}
call asifree (asi)
call sfree (sp)
end
# SH_LINESI -- Integer pixel shift.
#
# Shift the pixels in an image by an integer amount. Perform I/O without
# out type conversion and use array move operators.
procedure sh_linesi (im1, im2, shift, boundary, constant)
pointer im1 # Input image descriptor
pointer im2 # Output image descriptor
int shift # Integer shift
int boundary # Boundary extension type
real constant # Constant for boundary extension
int i, ncols, nlines, junk
long v1[IM_MAXDIM], v2[IM_MAXDIM], vout[IM_MAXDIM]
pointer buf1, buf2
int imggss(), imggsi(), imggsl(), imggsr(), imggsd(), imggsx()
int impnls(), impnli(), impnll(), impnlr(), impnld(), impnlx()
begin
# Set the boundary extension parameters.
call imseti (im1, IM_NBNDRYPIX, abs (shift))
call imseti (im1, IM_TYBNDRY, boundary)
call imsetr (im1, IM_BNDRYPIXVAL, constant)
# Return if shift off image.
ncols = IM_LEN(im1, 1)
if (shift < -ncols || shift > ncols)
call error (0, "Shiftlinesi: shift out of bounds")
# Setup start vector for sequential reads and writes.
v1[1] = max (-ncols + 1, -shift + 1)
v2[1] = min (2 * ncols, ncols - shift)
do i = 2, IM_NDIM(im1) {
v1[i] = long (1)
v2[i] = long (1)
}
call amovkl (long(1), vout, IM_MAXDIM)
# Setup line counter.
nlines = 1
do i = 2, IM_NDIM(im1)
nlines = nlines * IM_LEN(im1, i)
# Shift the image using appropriate datatype operators.
switch (IM_PIXTYPE(im1)) {
case TY_SHORT:
do i = 1, nlines {
buf1 = imggss (im1, v1, v2, IM_NDIM(im1))
if (buf1 == EOF)
call error (0, "Shiftlines: error reading input image")
junk = impnls (im2, buf2, vout)
if (junk == EOF)
call error (0, "Shiftlinesi: error writing out image")
call amovs (Mems[buf1], Mems[buf2], ncols)
call sh_loop (v1, v2, IM_LEN(im1,1), IM_NDIM(im1))
}
case TY_INT:
do i = 1, nlines {
buf1 = imggsi (im1, v1, v2, IM_NDIM(im1))
if (buf1 == EOF)
call error (0, "Shiftlines: error reading input image")
junk = impnli (im2, buf2, vout)
if (junk == EOF)
call error (0, "Shiftlinesi: error writing out image")
call amovi (Memi[buf1], Memi[buf2], ncols)
call sh_loop (v1, v2, IM_LEN(im1,1), IM_NDIM(im1))
}
case TY_LONG:
do i = 1, nlines {
buf1 = imggsl (im1, v1, v2, IM_NDIM(im1))
if (buf1 == EOF)
call error (0, "Shiftlines: error reading input image")
junk = impnll (im2, buf2, vout)
if (junk == EOF)
call error (0, "Shiftlinesi: error writing out image")
call amovl (Meml[buf1], Meml[buf2], ncols)
call sh_loop (v1, v2, IM_LEN(im1,1), IM_NDIM(im1))
}
case TY_REAL:
do i = 1, nlines {
buf1 = imggsr (im1, v1, v2, IM_NDIM(im1))
if (buf1 == EOF)
call error (0, "Shiftlines: error reading input image")
junk = impnlr (im2, buf2, vout)
if (junk == EOF)
call error (0, "Shiftlinesi: error writing out image")
call amovr (Memr[buf1], Memr[buf2], ncols)
call sh_loop (v1, v2, IM_LEN(im1,1), IM_NDIM(im1))
}
case TY_DOUBLE:
do i = 1, nlines {
buf1 = imggsd (im1, v1, v2, IM_NDIM(im1))
if (buf1 == EOF)
call error (0, "Shiftlines: error reading input image")
junk = impnld (im2, buf2, vout)
if (junk == EOF)
call error (0, "Shiftlinesi: error writing out image")
call amovd (Memd[buf1], Memd[buf2], ncols)
call sh_loop (v1, v2, IM_LEN(im1,1), IM_NDIM(im1))
}
case TY_COMPLEX:
do i = 1, nlines {
buf1 = imggsx (im1, v1, v2, IM_NDIM(im1))
if (buf1 == EOF)
call error (0, "Shiftlines: error reading input image")
junk = impnlx (im2, buf2, vout)
if (junk == EOF)
call error (0, "Shiftlinesi: error writing out image")
call amovx (Memx[buf1], Memx[buf2], ncols)
call sh_loop (v1, v2, IM_LEN(im1,1), IM_NDIM(im1))
}
default:
call error (0, "Unknown pixel datatype")
}
end
# SH_LOOP -- Increment the vector V from VS to VE (nested do loops cannot
# be used because of the variable number of dimensions). Return LOOP_DONE
# when V exceeds VE.
procedure sh_loop (vs, ve, szdims, ndim)
long vs[ndim] # the start vector
long ve[ndim] # the end vector
long szdims[ndim] # the dimensions vector
int ndim # the number of dimensions
int dim
begin
for (dim=2; dim <= ndim; dim=dim+1) {
vs[dim] = vs[dim] + 1
ve[dim] = vs[dim]
if (vs[dim] - szdims[dim] == 1) {
if (dim < ndim) {
vs[dim] = 1
ve[dim] = 1
} else
break
} else
break
}
end
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