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greg |
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/* Copyright (c) 1990 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#endif |
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/* |
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* program to convert between RADIANCE and 24-bit rasterfiles. |
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*/ |
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#include <stdio.h> |
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#include "rasterfile.h" |
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#include "color.h" |
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extern double atof(), pow(); |
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double gamma = 2.0; /* gamma correction */ |
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char *progname; |
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int xmax, ymax; |
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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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struct rasterfile head; |
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int reverse = 0; |
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int i; |
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progname = argv[0]; |
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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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case 'g': |
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gamma = atof(argv[++i]); |
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break; |
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case 'r': |
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reverse = !reverse; |
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break; |
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default: |
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goto userr; |
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} |
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else |
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break; |
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if (i < argc-2) |
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goto userr; |
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if (i <= argc-1 && freopen(argv[i], "r", stdin) == NULL) { |
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fprintf(stderr, "%s: can't open input \"%s\"\n", |
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progname, argv[i]); |
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exit(1); |
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} |
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if (i == argc-2 && freopen(argv[i+1], "w", stdout) == NULL) { |
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fprintf(stderr, "can't open output \"%s\"\n", |
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progname, argv[i+1]); |
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exit(1); |
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} |
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if (reverse) { |
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/* get header */ |
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if (fread((char *)&head, sizeof(head), 1, stdin) != 1) |
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quiterr("missing header"); |
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if (head.ras_magic != RAS_MAGIC) |
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quiterr("bad raster format"); |
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xmax = head.ras_width; |
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ymax = head.ras_height; |
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if (head.ras_type != RT_STANDARD || |
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head.ras_maptype != RMT_NONE || |
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head.ras_depth != 24) |
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quiterr("incompatible format"); |
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/* put header */ |
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printargs(i, argv, stdout); |
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putchar('\n'); |
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fputresolu(YMAJOR|YDECR, xmax, ymax, stdout); |
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/* convert file */ |
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pr2ra(); |
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} else { |
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/* discard input header */ |
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getheader(stdin, NULL); |
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/* get resolution */ |
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if (fgetresolu(&xmax, &ymax, stdin) != (YMAJOR|YDECR)) |
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quiterr("bad picture size"); |
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/* write rasterfile header */ |
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head.ras_magic = RAS_MAGIC; |
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head.ras_width = xmax; |
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head.ras_height = ymax; |
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head.ras_depth = 24; |
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head.ras_length = xmax*ymax*3; |
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head.ras_type = RT_STANDARD; |
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head.ras_maptype = RMT_NONE; |
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head.ras_maplength = 0; |
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fwrite((char *)&head, sizeof(head), 1, stdout); |
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/* convert file */ |
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ra2pr(); |
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} |
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exit(0); |
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userr: |
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fprintf(stderr, "Usage: %s [-r][-g gamma] [input [output]]\n", |
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progname); |
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exit(1); |
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} |
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quiterr(err) /* print message and exit */ |
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char *err; |
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{ |
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if (err != NULL) { |
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fprintf(stderr, "%s: %s\n", progname, err); |
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exit(1); |
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} |
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exit(0); |
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} |
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pr2ra() /* convert 24-bit scanlines to Radiance picture */ |
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{ |
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float gmap[256]; |
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int r, g, b; |
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COLOR *scanout; |
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register int x; |
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int y; |
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/* allocate scanline */ |
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scanout = (COLOR *)malloc(xmax*sizeof(COLOR)); |
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if (scanout == NULL) |
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quiterr("out of memory in pr2ra"); |
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/* compute gamma correction */ |
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for (x = 0; x < 256; x++) |
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gmap[x] = pow((x+.5)/256., gamma); |
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/* convert image */ |
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for (y = ymax-1; y >= 0; y--) { |
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for (x = 0; x < xmax; x++) { |
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r = getc(stdin); g = getc(stdin); |
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if ((b = getc(stdin)) == EOF) |
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quiterr("error reading rasterfile"); |
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setcolor(scanout[x], gmap[r], gmap[g], gmap[b]); |
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} |
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if (fwritescan(scanout, xmax, stdout) < 0) |
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quiterr("error writing Radiance picture"); |
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} |
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/* free scanline */ |
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free((char *)scanout); |
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} |
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ra2pr() /* convert Radiance scanlines to 24-bit rasterfile */ |
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{ |
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#define map(v) ((v)>=1.0 ? 255 : gmap[(int)(1024.*(v))]) |
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unsigned char gmap[1024]; |
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COLOR *scanin; |
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register int x; |
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register int c; |
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int y; |
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/* allocate scanline */ |
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scanin = (COLOR *)malloc(xmax*sizeof(COLOR)); |
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if (scanin == NULL) |
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quiterr("out of memory in pr2ra"); |
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/* compute gamma correction */ |
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greg |
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for (x = 0; x < 1024; x++) |
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greg |
1.1 |
gmap[x] = 256.*pow((x+.5)/1024., 1./gamma); |
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/* convert image */ |
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for (y = ymax-1; y >= 0; y--) { |
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if (freadscan(scanin, xmax, stdin) < 0) |
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quiterr("error reading Radiance picture"); |
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for (x = 0; x < xmax; x++) { |
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c = map(colval(scanin[x],RED)); |
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putc(c, stdout); |
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c = map(colval(scanin[x],GRN)); |
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putc(c, stdout); |
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c = map(colval(scanin[x],BLU)); |
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putc(c, stdout); |
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} |
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if (ferror(stdout)) |
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quiterr("error writing rasterfile"); |
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} |
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/* free scanline */ |
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free((char *)scanin); |
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#undef map |
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} |
