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#ifndef lint |
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static const char RCSid[] = "$Id: ra_skel.c,v 2.14 2025/06/06 19:11:21 greg Exp $"; |
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#endif |
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/* |
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* Skeletal 24-bit image conversion program. Replace "skel" |
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* in this file with a more appropriate image type identifier. |
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* |
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* The Rmakefile entry should look something like this: |
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* ra_skel: ra_skel.o |
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* cc $(CFLAGS) -o ra_skel ra_skel.o -lrtrad -lm |
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* ra_skel.o: ../common/color.h ../common/resolu.h |
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* |
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* If you like to do things the hard way, you can link directly |
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* to the object files "color.o colrops.o resolu.o header.o" in |
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* the common subdirectory instead of using the -lrtrad library. |
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*/ |
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|
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#include <stdio.h> |
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#include <math.h> |
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#include <time.h> |
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#include "platform.h" |
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#include "color.h" |
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#include "resolu.h" |
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|
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double gamcor = 2.2; /* gamma correction */ |
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|
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int bradj = 0; /* brightness adjustment */ |
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|
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int xmax, ymax; |
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|
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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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int reverse = 0; |
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int i; |
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|
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fixargv0(argv[0]); |
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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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case 'g': /* gamma correction */ |
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gamcor = atof(argv[++i]); |
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break; |
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case 'e': /* exposure adjustment */ |
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if (argv[i+1][0] != '+' && argv[i+1][0] != '-') |
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goto userr; |
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bradj = atoi(argv[++i]); |
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break; |
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case 'r': /* reverse conversion */ |
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reverse = 1; |
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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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|
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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, "%s: 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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SET_FILE_BINARY(stdin); |
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SET_FILE_BINARY(stdout); |
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setcolrgam(gamcor); /* set up gamma correction */ |
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if (reverse) { |
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/* get their image resolution */ |
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read_skel_head(&xmax, &ymax); |
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/* put our header */ |
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newheader("RADIANCE", stdout); |
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printargs(i, argv, stdout); |
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fputformat(COLRFMT, stdout); |
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putchar('\n'); |
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fprtresolu(xmax, ymax, stdout); |
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/* convert file */ |
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skel2ra(); |
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} else { |
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/* get our header */ |
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if (checkheader(stdin, COLRFMT, NULL) < 0 || |
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fgetresolu(&xmax, &ymax, stdin) < 0) |
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quiterr("bad picture format"); |
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/* write their header */ |
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write_skel_head(xmax, ymax); |
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/* convert file */ |
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ra2skel(); |
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} |
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exit(0); |
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userr: |
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fprintf(stderr, |
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"Usage: %s [-r][-g gamma][-e +/-stops] [input [output]]\n", |
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progname); |
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exit(1); |
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} |
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|
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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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|
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|
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skel2ra() /* convert 24-bit scanlines to Radiance picture */ |
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{ |
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COLR *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 = (COLR *)malloc(xmax*sizeof(COLR)); |
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if (scanout == NULL) |
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quiterr("out of memory in skel2ra"); |
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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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scanout[x][RED] = getc(stdin); |
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scanout[x][GRN] = getc(stdin); |
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scanout[x][BLU] = getc(stdin); |
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} |
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if (feof(stdin) | ferror(stdin)) |
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quiterr("error reading skel image"); |
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/* undo gamma */ |
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gambs_colrs(scanout, xmax); |
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if (bradj) /* adjust exposure */ |
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shiftcolrs(scanout, xmax, bradj); |
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if (fwritecolrs(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((void *)scanout); |
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} |
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|
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|
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ra2skel() /* convert Radiance scanlines to 24-bit */ |
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{ |
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COLR *scanin; |
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register int x; |
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int y; |
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/* allocate scanline */ |
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scanin = (COLR *)malloc(xmax*sizeof(COLR)); |
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if (scanin == NULL) |
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quiterr("out of memory in ra2skel"); |
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/* convert image */ |
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for (y = ymax-1; y >= 0; y--) { |
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if (freadcolrs(scanin, xmax, stdin) < 0) |
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quiterr("error reading Radiance picture"); |
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if (bradj) /* adjust exposure */ |
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shiftcolrs(scanin, xmax, bradj); |
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colrs_gambs(scanin, xmax); /* gamma correction */ |
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for (x = 0; x < xmax; x++) { |
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putc(scanin[x][RED], stdout); |
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putc(scanin[x][GRN], stdout); |
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putc(scanin[x][BLU], stdout); |
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} |
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if (ferror(stdout)) |
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quiterr("error writing skel file"); |
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} |
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/* free scanline */ |
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free((void *)scanin); |
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} |
