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PBM_PLUS
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rasttopbm.c
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C/C++ Source or Header
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1980-12-04
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106 lines
/* rasttopbm.c - read a Sun raster file and produce a portable bitmap
**
** Copyright (C) 1988 by Jef Poskanzer.
**
** Permission to use, copy, modify, and distribute this software and its
** documentation for any purpose and without fee is hereby granted, provided
** that the above copyright notice appear in all copies and that both that
** copyright notice and this permission notice appear in supporting
** documentation. This software is provided "as is" without express or
** implied warranty.
*/
#include <stdio.h>
#include "pbm.h"
/* This program compiles only on Suns. */
#include <pixrect/pixrect_hs.h>
main( argc, argv )
int argc;
char *argv[];
{
FILE *ifd;
struct rasterfile header;
struct pixrect *pr, *pr_load_image();
register bit *bitrow, *bP;
int rows, cols, row, col, shortcount, mask;
int linesize;
short *data;
pm_progname = argv[0];
if ( argc > 2 )
pm_usage( "[rastfile]" );
if ( argc == 2 )
ifd = pm_openr( argv[1] );
else
ifd = stdin;
/* Read in the raster file. First the header. */
if ( pr_load_header( ifd, &header ) != 0 )
pm_error( "unable to read in raster file header", 0,0,0,0,0 );
/* PBM can only handle monochrome bitmaps. */
if ( header.ras_depth != 1 )
pm_error(
"invalid depth %d - PBM can only handle depth 1",
header.ras_depth, 0,0,0,0 );
cols = header.ras_width;
rows = header.ras_height;
if ( cols <= 0 )
pm_error( "invalid cols: %d", cols, 0,0,0,0 );
if ( rows <= 0 )
pm_error( "invalid rows: %d", rows, 0,0,0,0 );
/* If there is a color map (there shouldn't be), skip over it. */
if ( header.ras_maptype != RMT_NONE || header.ras_maplength != 0 )
{
if (pr_load_colormap(ifd, &header, NULL) != 0)
pm_error( "unable to skip colormap data", 0,0,0,0,0 );
}
/* Now load the data. The pixrect returned is a memory pixrect. */
if ( (pr = pr_load_image(ifd, &header, NULL)) == NULL )
pm_error(
"unable to read in the image from the raster file", 0,0,0,0,0 );
#ifdef sun386
/* Force a flip to 680x0 format. */
pr_flip( pr );
( (struct mpr_data *) pr->pr_data )->md_flags &= ! MP_I386;
pr_flip( pr );
#endif
linesize = ( (struct mpr_data *) pr->pr_data )->md_linebytes;
data = ( (struct mpr_data *) pr->pr_data )->md_image;
pm_close( ifd );
/* Now write out the PBM. */
pbm_writepbminit( stdout, cols, rows );
bitrow = pbm_allocrow( cols );
for ( row = 0; row < rows; row++ )
{
shortcount = 0;
mask = 0x8000;
for ( col = 0, bP = bitrow; col < cols; col++, bP++ )
{
if ( mask == 0 )
{
shortcount++;
mask = 0x8000;
}
*bP = ( *(data + shortcount) & mask ) ? PBM_BLACK : PBM_WHITE;
mask = mask >> 1;
}
data += linesize / sizeof(short);
pbm_writepbmrow( stdout, bitrow, cols );
}
exit( 0 );
}