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greg |
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#ifndef lint
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greg |
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static const char RCSid[] = "$Id: slide.c,v 1.3 2003/02/22 02:07:28 greg Exp $";
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greg |
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#endif
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greg |
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/*
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greg |
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* slide.c - driver for dicomed film recorder using GRAFPAC under VMS.
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*
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* 2/19/86
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*
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* Version for color slide ouput.
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* Link with grafpac driver "DS":
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* link slide.obj,color.obj,sys_grafpac:ds/lib
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*/
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#include <stdio.h>
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#include "color.h"
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#include "random.h"
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#define XSIZE 4096 /* device width */
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#define YSIZE 4096 /* device length */
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#define NCOLS 4018 /* maximum # columns for output */
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#define NROWS 2712 /* maximum # rows for output */
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#define XCENTER 2048 /* center for x */
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#define YCENTER 2048 /* center for y */
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int nrows; /* number of rows for output */
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int ncols; /* number of columns for output */
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int xoffset; /* offset for x */
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int yoffset; /* offset for y */
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#define RSIZ 17 /* size of response map */
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float rmap[2*RSIZ] = { /* response map */
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.0, .0,
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.0004, .059,
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.0008, .122,
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.0018, .184,
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.0033, .247,
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.0061, .310,
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.0119, .373,
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.0202, .435,
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.0373, .498,
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.065, .561,
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.113, .624,
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.199, .686,
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.300, .749,
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.432, .812,
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.596, .875,
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.767, .937,
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1.000, 1.000,
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};
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main(argc, argv)
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int argc;
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char **argv;
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{
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FILE *fin;
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COLOR scanline[NCOLS];
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int mult;
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char sbuf[128];
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int i, j;
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/*
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for (i = 1; i < argc; i++)
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if (argv[i][0] == '-')
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switch (argv[i][1]) {
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default:
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fprintf(stderr, "unknown option: %s\n", argv[i]);
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exit(1);
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break;
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}
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else
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break;
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*/
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argc = 2;
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argv[1] = "pixfile";
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i = 1;
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if (argc - i < 1)
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fin = 0;
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else if ((fin = fopen(argv[i], "r")) == NULL) {
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fprintf(stderr, "%s: can't open file \"%s\"\n",
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argv[0], argv[i]);
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exit(1);
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}
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/* discard header */
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while (fgets(sbuf, sizeof(sbuf), fin) != NULL && sbuf[0] != '\n')
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;
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/* get picture size */
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if (fgets(sbuf, sizeof(sbuf), fin) == NULL ||
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sscanf(sbuf, "-Y %d +X %d\n", &nrows, &ncols) != 2) {
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fprintf(stderr, "%s: bad picture size\n", argv[0]);
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exit(1);
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}
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if (ncols > NCOLS || nrows > NROWS) {
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fprintf(stderr, "%s: resolution mismatch\n", argv[0]);
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exit(1);
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}
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mult = NCOLS/ncols;
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if (NROWS/nrows < mult)
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mult = NROWS/nrows;
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xoffset = XCENTER/mult - ncols/2;
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yoffset = YCENTER/mult - nrows/2;
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tvinit();
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i = XSIZE/mult; j = YSIZE/mult; tvvrs(&i, &j);
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i = 12; tvset("ifile", &i);
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tvset("nrco", "rgb");
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for (i = nrows-1; i >= 0; i--) {
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if (freadscan(scanline, ncols, fin) < 0) {
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fprintf(stderr, "%s: read error in row %d\n",
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argv[0], i);
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exit(1);
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}
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scanout(scanline, i);
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}
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tvsend();
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tvend();
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return(0);
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}
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scanout(scan, y) /* output scan line */
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register COLOR *scan;
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int y;
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{
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static int zero;
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static float rgb[3][NCOLS];
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int i;
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register int j;
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zero = xoffset;
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y += yoffset;
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for (j = 0; j < ncols; j++) {
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mapcolor(scan[j], scan[j]);
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for (i = 0; i < 3; i++)
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rgb[i][j] = scan[j][i] + (.5-frandom())/255.0;
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}
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tvrstc(&zero, &y, rgb[0], rgb[1], rgb[2], &ncols);
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}
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mapcolor(c1, c2) /* map c1 into c2 */
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register COLOR c1;
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COLOR c2;
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{
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static float *mp[3] = {rmap, rmap, rmap};
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double x;
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register int i;
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for (i = 0; i < 3; i++) {
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if (colval(c1,i) >= 1.0) {
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colval(c2,i) = 1.0;
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continue;
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}
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while (colval(c1,i) >= mp[i][2])
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mp[i] += 2;
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while (colval(c1,i) < mp[i][0])
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mp[i] -= 2;
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x = (colval(c1,i) - mp[i][0]) / (mp[i][2] - mp[i][0]);
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colval(c2,i) = (1.0-x)*mp[i][1] + x*mp[i][3];
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}
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}
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