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Usenet 1994 October
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usenetsourcesnewsgroupsinfomagicoctober1994disk2.iso
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unix
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volume19
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fbm
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part04
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fbhalf.c
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C/C++ Source or Header
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1989-06-08
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6KB
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210 lines
/*****************************************************************
* fbhalf.c: FBM Library 0.93 (Beta test) 03-May-89 Michael Mauldin
*
* Copyright (C) 1989 by Michael Mauldin. Permission is granted to
* use this file in whole or in part provided that you do not sell it
* for profit and that this copyright notice is retained unchanged.
*
* 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 = Wed May 3 21:50:43 1989 - Michael Mauldin
* LastFileName = /usr2/mlm/src/misc/fbm/fbhalf.c
*
* HISTORY
* 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 =
"$FBM fbhalf.c <0.93> 03-May-89 (C) 1989 by Michael Mauldin$";
#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 '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);
}