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greg |
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/* |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#endif |
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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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extern char *malloc(); |
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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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} |
