Category : C Source Code
Archive   : FBM10.ZIP
Filename : FLEXTR.C

 
Output of file : FLEXTR.C contained in archive : FBM10.ZIP
/*****************************************************************
* flextr.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.
*
* flextr.c: Extract a rectangle and/or resize it.
*
* CONTENTS
* extract_fbm (input, output, xo, yo, w, h, ow, oh, title, credits)
*
* EDITLOG
* LastEditDate = Mon Jun 25 17:03:19 1990 - Michael Mauldin
* LastFileName = /usr2/mlm/src/misc/fbm0.99/flextr.c
*
* HISTORY
* 25-Jun-90 Michael Mauldin ([email protected]) Carnegie Mellon
* Package for Release 1.0
*
* 13-Jun-90 Michael Mauldin (mlm) at Carnegie Mellon University
* Final release (version 1.0) [email protected]
*
* 07-Mar-89 Michael Mauldin (mlm) at Carnegie Mellon University
* Beta release (version 0.9) [email protected]
*
* 12-Nov-88 Michael Mauldin (mlm) at Carnegie-Mellon University
* Created.
*****************************************************************/

# include
# include
# include
# include "fbm.h"

/****************************************************************
* extract_fbm: Resize a bitmap
* copy input [xo:xo+w yo:yo+h] to output [ow oh]
****************************************************************/

#ifndef lint
static char *fbmid =
"$FBM flextr.c <1.0> 25-Jun-90 (C) 1989,1990 by Michael Mauldin, source \
code available free from [email protected] and from UUNET archives$";
#endif

extract_fbm (input, output, xo, yo, w, h, ow, oh, title, credits)
FBM *input, *output;
int xo, yo, h, w, oh, ow;
char *title, *credits;
{ int k, rowlen;

if ((w != ow || h != oh) && input->hdr.bits != 8)
{ fprintf (stderr,
"Can't resize images with %d bits per pixel\n", input->hdr.bits);
return (0);
}

if (input->hdr.physbits != 8)
{ fprintf (stderr,
"Can't extract images with %d physbits per pixel\n",
input->hdr.physbits);
return (0);
}

if (h < 1 || w < 1 || oh < 1 || ow < 1)
{ fprintf (stderr, "Extract: zero dimension [%dx%d] => [%dx%d]\n",
w, h, ow, oh);
return (0);
}

fprintf (stderr,
"Extract \"%s\" <%d,%d> [%dx%d] => [%dx%d] %d pixels\n",
title ? title : input->hdr.title[0] ? input->hdr.title : "untitled",
xo, yo, w, h, ow, oh, ow*oh);

if (xo+w > input->hdr.cols)
{ fprintf (stderr, "Warning, input exceeds image horizontally\n");
fprintf (stderr, " xo %d, w %d, input->hdr.cols %d\n",
xo, w, input->hdr.cols);
}
if (yo+h > input->hdr.rows)
{ fprintf (stderr, "Warning, input exceeds image vertically\n");
fprintf (stderr, " yo %d, h %d, input->hdr.rows %d\n",
yo, h, input->hdr.rows);
}

/* Calculate length of row (pad to even byte boundary) */
rowlen = 2 * ((ow * input->hdr.physbits + 15) / 16);

/* Now build header for output bit map */
output->hdr.cols = ow;
output->hdr.rows = oh;
output->hdr.planes = input->hdr.planes;
output->hdr.bits = input->hdr.bits;
output->hdr.physbits = input->hdr.physbits;
output->hdr.rowlen = rowlen;
output->hdr.plnlen = oh * output->hdr.rowlen;
output->hdr.clrlen = input->hdr.clrlen;
output->hdr.aspect = input->hdr.aspect * ow * h / (oh * w);

if (title == NULL || *title == '\0')
{ strncpy (output->hdr.title, input->hdr.title, FBM_MAX_TITLE); }
else
{ strcpy (output->hdr.title, title); }

if (credits == NULL || *credits == '\0')
{ strncpy (output->hdr.credits, input->hdr.credits, FBM_MAX_TITLE); }
else
{ strcpy (output->hdr.credits, credits); }

/* Allocate space for output bits */
alloc_fbm (output);

copy_clr (input, output);

/* Warning about resizing mapped image */
if (input->hdr.clrlen > 0 && (w != ow || h != oh))
{ fprintf (stderr,
"Warning, %s\n %s\n",
"resizing a mapped image is probably not what you want",
"I'll do it anyway, but you should probably use unmap first.");
}

/* Now extract each plane separately */
for (k=0; khdr.planes; k++)
{ if (! extract_one (&(input->bm[k * input->hdr.plnlen]),
&(output->bm[k * output->hdr.plnlen]),
input->hdr.cols, input->hdr.rows,
input->hdr.rowlen, output->hdr.rowlen,
xo, yo, w, h, ow, oh))
{ free_fbm (output); return (0); }
}

return (1);
}

/****************************************************************
* extract_one: Resize a bitmap
* copy input [xo:xo+w yo:yo+h] to output [ow oh]
****************************************************************/

extract_one (inbm, outbm, cols, rows, inlen, outlen, xo, yo, w, h, ow, oh)
unsigned char *inbm, *outbm;
int inlen, outlen, xo, yo, h, w, oh, ow;
{ register int xf, yf, xi, i;
register unsigned char *bm1, *bm2, *obm;
int j, yi, dc;

/* Check for scale of 1-1, special case for speed */
if (w == ow && h == oh && xo >= 0 && yo >= 0 && xo+w <= cols && yo+h <= rows)
{ for (j=0; j { bm1 = &inbm[(j+yo) * inlen];
obm = &outbm[j * outlen];

for (i=0; i { obm[i] = bm1[i + xo]; }
}
}
else
{
for (j = 0; j { yi = (j*h / oh) + yo;
yf = (j*h % oh);

obm = &outbm[j * outlen];
bm1 = &inbm[yi * inlen];
bm2 = bm1 + inlen;

for (i=0; i { xi = (i*w / ow) + xo;
xf = (i*w % ow);

if (xi < 0 || yi < 0 ||
xi > cols-2 ||
yi > rows-2)
{ static cntr = 0;

/* If right on edge, just use edge value */
if ((xi == cols-1 &&
yi >= 0 && yi <= rows-1) ||
(yi == rows-1 &&
xi >= 0 && xi <= cols-1))
{ obm[i] = bm1[xi]; }
else
{ obm[i] = 255;

if (cntr++ < 3)
{ fprintf (stderr,
"i,j %d,%d => xi,yi %d,%d, out of bounds %d,%d\n",
i, j, xi, yi, cols, rows);
fprintf (stderr,
"w %d, h %d, ow %d, oh %d\n\n",
w, h, ow, oh);
}
}
}
else
{ dc = ( bm1[xi] * (ow-xf)*(oh-yf) +
bm2[xi] * (ow-xf)*(yf) +
bm1[xi+1] * (xf)*(oh-yf) +
bm2[xi+1] * (xf)*(yf) ) / (ow*oh);

if (dc < 0) { dc = 0; }
else if (dc > 255) { dc = 255; }

obm[i] = dc;
}
}
}
}

return (1);
}


  3 Responses to “Category : C Source Code
Archive   : FBM10.ZIP
Filename : FLEXTR.C

  1. Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!

  2. This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.

  3. But one thing that puzzles me is the “mtswslnkmcjklsdlsbdmMICROSOFT” string. There is an article about it here. It is definitely worth a read: http://www.os2museum.com/wp/mtswslnk/