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#include <stdio.h>
#ifdef ULTRIX
#include <sys/types.h>
#endif
#include <sys/types.h>
#include <unistd.h>
#include "cdl.h"
/*
* DISPLAY -- Example task to display an image as a command-line task.
* This task is meant to show three ways the CDL can be used to display
* and image, it is functional but perhaps not highly efficient for this
* reason. See the code comments for a description of each method.
*
* Examples:
* To display a simple IRAF or FITS file:
* % ./display -frame 2 image.imh
* % ./display image.fits
*
* To display a FITS file as a raw image:
* % ./display -nx 512 -ny 512 -depth 16 -hskip 5760 -raw dpix.fits
*
* Usage:
* display [-depth N] [-fits] [-frame N] [-fbconfig N] [-hskip N]
* [-iraf] [-nozscale] [-nx N] [-ny N] [-raw] [-zscale]
* [-ns N] [-nl N] [-log] file
*/
#define NONE -1
#define IRAF 0
#define FITS 1
#define RAW 2
#define ABS(x) (x > 0 ? x : -x)
main (argc, argv)
int argc;
char *argv[];
{
CDLPtr cdl;
char *fname;
int i, log = 0, status = 0, frame = 1, fbconfig = 0, zscale = 1;
int format = NONE, nx = 0, ny = 0, depth = 8, hskip = 0;
int ns = -1, nl = -1;
float z1, z2;
int fb_w, fb_h, nf;
unsigned char *pix = NULL;
/* Process the command line options. */
if (argc > 1) {
for (i=1; i < argc; i++) {
if (strcmp (argv[i], "-depth") == 0)
depth = atoi (argv[++i]);
else if (strcmp (argv[i], "-fits") == 0)
format = FITS;
else if (strcmp (argv[i], "-frame") == 0)
frame = atoi (argv[++i]);
else if (strcmp (argv[i], "-fbconfig") == 0)
fbconfig = atoi (argv[++i]);
else if (strcmp (argv[i], "-hskip") == 0)
hskip = atoi (argv[++i]);
else if (strcmp (argv[i], "-iraf") == 0)
format = IRAF;
else if (strcmp (argv[i], "-log") == 0)
log++;
else if (strcmp (argv[i], "-nozscale") == 0)
zscale = 0;
else if (strcmp (argv[i], "-ns") == 0)
ns = atoi (argv[++i]);
else if (strcmp (argv[i], "-nl") == 0)
nl = atoi (argv[++i]);
else if (strcmp (argv[i], "-nx") == 0)
nx = atoi (argv[++i]);
else if (strcmp (argv[i], "-ny") == 0)
ny = atoi (argv[++i]);
else if (strcmp (argv[i], "-raw") == 0)
format = RAW;
else if (strcmp (argv[i], "-zscale") == 0)
zscale = 1;
}
}
/* Open the package and a connection to the server. */
if (!(cdl = cdl_open ((char *)getenv("IMTDEV"))) )
exit (-1);
fname = argv[argc-1];
if (ns > 0) cdl_setSample (cdl, ns);
if (nl > 0) cdl_setSampleLines (cdl, nl);
if (log > 0) cdl_setZTrans (cdl, CDL_LOG);
/* METHOD 1: Displays the image using the high-level format display
* call. Display as an IRAF image if the option was set indicating
* this is the format, otherwise test the file to see if it is anyway.
*/
if (format == IRAF || (format == NONE && cdl_isIRAF (fname))) {
status = cdl_displayIRAF (cdl, fname, 1, frame,
(fbconfig==0 ? FB_AUTO : fbconfig), zscale);
/* METHOD 2: Uses the CDL procedure for getting image pixels from
* a known format, minimal work required to display an image. The
* point here is that you can use this mthod to process the image
* yourself prior to display, e.g. subsample the pixels, apply a user
* LUT, etc but still use the CDL to get the raw image and do the
* display.
*/
} else if (format == FITS || (format == NONE && cdl_isFITS (fname))) {
float *bscale, *bzero;
char title[80];
/* Get the FITS image pixels, exit w/ an error status if something
* went wrong, the procedure will print what that was.
*/
if (cdl_readFITS (fname, &pix, &nx, &ny, &depth, title)) {
cdl_close (cdl); /* close the package */
exit (1); /* exit w/ error code */
}
/* Now select a frame buffer large enough for the image. The
* fbconfig number is passed in the WCS packet, but the display
* call below will compute the correct WCS for the image and
* transmit that prior to display, all we're doing here is
* setting up the FB to be used.
*/
if (fbconfig == 0)
cdl_selectFB (cdl, nx, ny, &fbconfig, &fb_w, &fb_h, &nf, 0);
/* Lastly, display the pixels to the requested frame, do any
* zscaling requested using the CDL procedure.
*/
(void) cdl_setTitle (cdl, title);
(void) cdl_setName (cdl, fname);
if (cdl_displayPix(cdl, pix, nx, ny, depth, frame, fbconfig,zscale))
status = 1;
/* Now just free the pixel pointer to clean up.
*/
free ((unsigned char *) pix);
/* METHOD 3: Displays an image of raw pixels. The client code is
* responsible for reading the image and calling all the procedures
* needed for image display, initialize the frame, zscaling pix, etc.
* While we assume a simple raster format in this program, the user
* code can read a compressed image format such as GIF, mosaic multiple
* images for display as a single image, or just about anything that
* produces a raster for display. The intent here is to show all the
* lowest level calls needed for displaying the image.
*/
} else if (format == RAW) {
FILE *fd;
int lx, ly;
if (nx == 0 || ny == 0) {
fprintf (stderr, "No size given for raw data.\n");
exit (1);
}
/* Open the image file if we can. */
if (fd = fopen (fname, "r")) {
/* Seek to the offset specified. */
lseek (fileno(fd), (off_t) hskip, SEEK_SET);
/* Allocate the pixel pointer and read the data. */
pix = (unsigned char *) malloc (nx * ny * (ABS(depth) / 8));
fread (pix, ABS(depth)/8, nx * ny, fd);
/* If we're zscaling and depth is more than 8-bits, do that. */
if (zscale && ABS(depth) > 8) {
cdl_computeZscale (cdl, pix, nx, ny, depth, &z1, &z2);
cdl_zscaleImage (cdl, &pix, nx, ny, depth, z1, z2);
}
/* Now select a frame buffer large enough for the image. We'll
* ask that this be reset but the change won't go to the server
* until we send in a WCS, so compute that as well. For the
* WCS we assume a simple linear transform where the image is
* Y-flipped, the (x,y) translation is computed so it is correct
* for an frame buffer >= than the image size.
*/
cdl_selectFB (cdl, nx, ny, &fbconfig, &fb_w, &fb_h, &nf, 1);
cdl_setWCS (cdl, fname, "", 1., 0., 0., -1.,
(float) (nx / 2) - (fb_w / 2) + 1, /* X trans. */
(float) (fb_h / 2) + (ny / 2), /* Y trans. */
z1, z2, CDL_LINEAR); /* Z transform */
/* Select and clear the requested frame prior to display. */
cdl_setFrame (cdl, frame);
cdl_clearFrame (cdl);
/* Now display the pixels. We'll compute the image placement
* ourselves and write the image as a raw subraster of the frame
* buffer. In this case we'll center the image, but the CDL
* cdl_writeSubRaster() procedure can be used to write arbitrary
* rasters at any point in the frame buffer.
*/
lx = (fb_w / 2) - (nx / 2);
ly = fb_h - ((fb_h / 2) + (ny / 2));
if (cdl_writeSubRaster (cdl, lx, ly, nx, ny, pix))
status = 1;
/* Now just free the pixel pointer to clean up.
*/
free ((unsigned char *) pix);
fclose (fd);
} else
status = 1;
} else {
if (access (fname, F_OK) == 0)
fprintf (stderr, "'%s': unknown image format.\n", fname);
else
fprintf (stderr, "'%s': image does not exist.\n", fname);
status = 1;
}
cdl_close (cdl); /* close the package */
exit (status);
}
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