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- /*****************************************************************
- * fbm2pod.c: FBM Release 1.0 25-Feb-90 Michael Mauldin
- *
- * Copyright (C) 1989,1990 by Michael Mauldin. Permission is granted
- * to use this file in whole or in part for any purpose, educational,
- * recreational or commercial, provided that this copyright notice
- * is retained unchanged. This software is available to all free of
- * charge by anonymous FTP and in the UUNET archives.
- *
- * fbm2pod.c: Take an 8bit gray image, resize it to a maximum total
- * number of pixels, optionally sharpen it with a digital
- * Laplacian filter, and halftone it using one of three
- * standard algorithms. Output the result in Diablo
- * graphics format.
- *
- * USAGE
- * % fbm2pod [ -args ] [ size ] < foo.fbm > foo.pod
- *
- * size Choose a width and height as large as possible so that
- * width is a factor of 8 and width*height <= size (default
- * is width and height of original 8bit file, ignoring aspect
- * ratio).
- *
- * -f Do Floyd-Steinberg halftoning (the default algorithm)
- * -bNNN Do Blue noise halftoning (-b50 or 50% noise is default)
- * -cNNN Do Constained average halftoning (-c4 is the default)
- * -sNNN Sharpen the image with a given beta (-s2.0 is default)
- *
- * EDITLOG
- * LastEditDate = Mon Jun 25 00:03:25 1990 - Michael Mauldin
- * LastFileName = /usr2/mlm/src/misc/fbm/fbm2pod.c
- *
- * HISTORY
- * 25-Jun-90 Michael Mauldin (mlm@cs.cmu.edu) Carnegie Mellon
- * Package for Release 1.0
- *
- * 07-Mar-89 Michael Mauldin (mlm) at Carnegie Mellon University
- * Beta release (version 0.9) mlm@cs.cmu.edu
- *
- * 8-Sep-88 Michael Mauldin (mlm) at Carnegie-Mellon University
- * Created.
- *****************************************************************/
-
- # include <stdio.h>
- # include <math.h>
- # include "fbm.h"
-
- # define PODASPECT 1.25
-
- # define USAGE \
- "Usage: fbm2pod [ -fbc<parm> ] [-s<sharpen> ] [ size ] < 8bit > pod"
-
- #ifndef lint
- static char *fbmid =
- "$FBM fbm2pod.c <1.0> 25-Jun-90 (C) 1989,1990 by Michael Mauldin, source \
- code available free from MLM@CS.CMU.EDU and from UUNET archives$";
- #endif
-
- main (argc, argv)
- char *argv[];
- { int w, h, ow = -1, oh = -1, size = -1, alg = 'b';
- double beta = -1e9, parm = -1e9;
- char *title;
- FBM input, resized, sharpened, output, *image;
-
- /* Clear the memory pointers so alloc_fbm won't be confused */
- input.cm = input.bm = (unsigned char *) NULL;
- resized.cm = resized.bm = (unsigned char *) NULL;
- sharpened.cm = sharpened.bm = (unsigned char *) NULL;
- output.cm = output.bm = (unsigned char *) NULL;
-
- /* Read the image */
- if (read_bitmap (&input, (char *) NULL))
- {
- if (input.hdr.bits != 8 || input.hdr.physbits != 8)
- { fprintf (stderr,
- "Can't handle images with %d bits and %d physbits per pixel\n",
- input.hdr.bits, input.hdr.physbits);
- exit (1);
- }
-
- if (input.hdr.title[0]) title = input.hdr.title;
-
- /* Get the options */
- while (--argc > 0 && (*++argv)[0] == '-')
- { while (*++(*argv))
- { switch (**argv)
- { case 's': if (argv[0][1]) { beta = atof (*argv+1); SKIPARG; }
- else beta = 2.0;
- break;
-
- case 'f': alg = 'f'; break;
-
- case 'b': alg = 'b';
- if (argv[0][1]) { parm = atof (*argv+1); SKIPARG; }
- break;
-
- case 'c': alg = 'c';
- if (argv[0][1]) { parm = atof (*argv+1); SKIPARG; }
- break;
-
- default: fprintf (stderr, "%s", USAGE);
- exit (1);
- }
- }
- }
-
- if (argc > 0) size = atoi (argv[0]);
-
- /* Default parms for algorithms */
- if (parm <= -1e9)
- { if (alg == 'b') parm = 50.0;
- else if (alg == 'c') parm = 4.0;
- }
-
- /* Determine output height & width (oh*ow <= size) */
- h = input.hdr.rows;
- w = input.hdr.cols;
-
- if (size < 0)
- { oh = h; ow = w; }
- else
- { ow = sqrt ((double) size * w / (h * input.hdr.aspect / PODASPECT));
- ow &= ~7; /* Make width multiple of 8 */
- oh = ow * input.hdr.aspect/PODASPECT * h / w;
- }
-
- fprintf (stderr,
- "Halftone \"%s\" size [%dx%d] => %d pixels\n",
- input.hdr.title[0] ? input.hdr.title : "(untitled)",
- ow, oh, ow*oh);
-
- /* Start with image in variable 'input' */
- image = &input;
-
- /* If necessary, resize it */
- if (w != ow || h != oh)
- { if (extract_fbm (&input, &resized, 0, 0, w, h, ow, oh, title, (char *) NULL))
- { image = &resized; }
- else
- { exit (1); }
- }
-
- /* Sharpen the image if requested */
- if (beta > -1e9)
- { if (sharpen_fbm (image, &sharpened, beta))
- { image = &sharpened; }
- else
- { exit (1); }
- }
-
- /* Now use the appropriate algorithm to halftone it */
- switch (alg)
- { case 'b': bluenoise_fbm (image, &output, parm); break;
- case 'c': constravg_fbm (image, &output, parm); break;
- default: floyd_fbm (image, &output);
- }
-
- if (write_pod (&output, stdout)) exit (0);
- }
-
- exit (1);
- }
-
- /****************************************************************
- * write_pod: Write out a binary bitmap as a Diablo file, for use
- * by the podtype or mp programs.
- ****************************************************************/
-
- # define FF "\014"
- # define LF "\012"
- # define CR "\015"
- # define GON "\033\037\005\033\036\003"
- # define GOFF "\033\037\015\033\036\011"
- # define ABSTAB "\033\011"
- # define STARTCOL 10
-
- write_pod (image, stream)
- FBM *image;
- FILE *stream;
- { register int i, j, h, w;
-
- h = image->hdr.rows;
- w = image->hdr.cols;
-
- /* Bracket commands with form feeds (for podtype) */
- fprintf (stream, "%s%s%s", FF, CR, GOFF);
-
- for (j=0; j<h; j++)
- { fprintf (stream, "%s%c%s", ABSTAB, STARTCOL+1, GON);
- for (i=0; i<w; i++)
- { putchar (image->bm[j*w + i] ? ' ' : '.'); }
- fprintf (stream, "%s%s%s", LF, GOFF, CR);
-
- }
-
- fprintf (stream, "%s", FF);
-
- return (1);
- }
-