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- /*****************************************************************
- * fbhalf.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.
- *
- * fbhalf.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 PBM format.
- *
- * USAGE
- * % fbhalf [ -args ] [ size ] < 8bit > 1bit
- *
- * 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)
- * -b<int> Do Blue noise halftoning (-b50 or 50% noise is default)
- * -c<int> Do Constained average halftoning (-c4 is the default)
- * -s<int> Sharpen the image with a given beta (-s2.0 is default)
- * -t<int> Use a threshhold of <int> to halftone (127 is default)
- *
- * -C<int>,-N<int>
- * Clean up image by flipping isolated pixels. A pixel is
- * isolated if there are fewer than C like pixels in the
- * nearby NxN square.
- *
- * EDITLOG
- * LastEditDate = Mon Jun 25 00:02:44 1990 - Michael Mauldin
- * LastFileName = /usr2/mlm/src/misc/fbm/fbhalf.c
- *
- * HISTORY
- * 25-Jun-90 Michael Mauldin (mlm@cs.cmu.edu) Carnegie Mellon
- * Package for Release 1.0
- *
- * 03-May-89 Michael Mauldin (mlm) at Carnegie Mellon University
- * Beta release (version 0.93) 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 USAGE\
- "Usage: fbhalf [ -fbct<parm> ] [-s<sharpen> ] [ -<type> ]\n\
- [ -C<clean> -N<nbr>] [ size ] < 8bit > 1bit"
-
- #ifndef lint
- static char *fbmid =
- "$FBM fbhalf.c <1.0> 25-Jun-90 (C) 1989,1990 by Michael Mauldin, source \
- code available free from MLM@CS.CMU.EDU and from UUNET archives$";
- #endif
-
- main (argc, argv)
- char *argv[];
- { int w, h, ow = -1, oh = -1, size = -1, alg = 'b';
- int clean = -1, nbr = 5, outtype = DEF_1BIT;
- double beta = -1e9, parm = -1e9;
- char *title, *credits;
- FBM input, resized, sharpened, halftoned, cleaned, *image;
-
- /* Clear pointers */
- input.bm = input.cm = (unsigned char *) NULL;
- resized.bm = resized.cm = (unsigned char *) NULL;
- sharpened.bm = sharpened.cm = (unsigned char *) NULL;
- halftoned.bm = halftoned.cm = (unsigned char *) NULL;
- cleaned.bm = cleaned.cm = (unsigned char *) NULL;
-
- 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;
- if (input.hdr.credits[0]) credits = input.hdr.credits;
-
- /* 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'; parm = 0.0; 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;
-
- case 't': alg = 't';
- if (argv[0][1]) { parm = atoi (*argv+1); SKIPARG; }
- else { parm = 127; }
- break;
-
- case 'C': if (argv[0][1]) { clean = atoi (*argv+1); SKIPARG; }
- else { clean = 10; }
- break;
-
- case 'N': if (argv[0][1]) { nbr = atoi (*argv+1); SKIPARG; }
- else { nbr = 5; }
-
- if (clean < 0) { clean = 10; }
- break;
-
- case 'A': outtype = FMT_ATK; break;
- case 'B': outtype = FMT_FACE; break;
- case 'F': outtype = FMT_FBM; break;
- case 'G': outtype = FMT_GIF; break;
- case 'I': outtype = FMT_IFF; break;
- case 'L': outtype = FMT_LEAF; break;
- case 'M': outtype = FMT_MCP; break;
- case 'P': outtype = FMT_PBM; break;
- case 'R': outtype = FMT_RLE; break;
- case 'S': outtype = FMT_SUN; break;
- case 'T': outtype = FMT_TIFF; break;
- case 'X': outtype = FMT_X11; break;
- case 'Z': outtype = FMT_PCX; 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;
- else if (alg == 't') parm = 128.0;
- }
-
- /* 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));
- ow &= ~7; /* Make width multiple of 8 */
- oh = ow * input.hdr.aspect * 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 (image, &resized, 0, 0, w, h, ow, oh, title, credits))
- { free_fbm (image);
- image = &resized;
- }
- else
- { exit (1); }
- }
-
- /* Sharpen the image if requested */
- if (beta > -1e9)
- { if (sharpen_fbm (image, &sharpened, beta))
- { free_fbm (image);
- image = &sharpened;
- }
- else
- { exit (1); }
- }
-
- /* Now use the appropriate algorithm to halftone it */
- switch (alg)
- { case 'b': bluenoise_fbm (image, &halftoned, parm); break;
- case 'c': constravg_fbm (image, &halftoned, parm); break;
- case 't': thesh_fbm (image, &halftoned, (int) parm); break;
- default: floyd_fbm (image, &halftoned);
- }
-
- /* free_fbm (image); */
- image = &halftoned;
-
- if (clean >= 0)
- { if (!clean_fbm (image, &cleaned, clean, 1, nbr))
- { exit (1); }
-
- free_fbm (image);
- image = &cleaned;
- }
-
- if (write_bitmap (image, stdout, outtype)) exit (0);
- }
-
- exit (1);
- }
-