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OS/2 Shareware BBS: 10 Tools
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pbm
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pbmmake.c
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1993-10-04
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/* pbmmake.c - create a blank bitmap of a specified size
**
** 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 "pbm.h"
int
main( argc, argv )
int argc;
char* argv[];
{
register bit color, gray, rowcolor;
bit* bitrow;
register bit* bP;
int argn, rows, cols, row, col;
char* usage = "[-white|-black|-gray] <width> <height>";
pbm_init( &argc, argv );
argn = 1;
color = PBM_WHITE;
gray = 0;
/* Check for flags. */
if ( argn < argc && argv[argn][0] == '-' && argv[argn][1] != '\0' )
{
if ( pm_keymatch( argv[argn], "-white", 2 ) )
color = PBM_WHITE;
else if ( pm_keymatch( argv[argn], "-black", 2 ) )
color = PBM_BLACK;
else if ( pm_keymatch( argv[argn], "-gray", 2 ) ||
pm_keymatch( argv[argn], "-grey", 2 ) )
gray = 1;
else
pm_usage( usage );
++argn;
}
if ( argn == argc )
pm_usage( usage );
if ( sscanf( argv[argn], "%d", &cols ) != 1 )
pm_usage( usage );
++argn;
if ( argn == argc )
pm_usage( usage );
if ( sscanf( argv[argn], "%d", &rows ) != 1 )
pm_usage( usage );
++argn;
if ( argn != argc )
pm_usage( usage );
pbm_writepbminit( stdout, cols, rows, 0 );
bitrow = pbm_allocrow( cols );
if ( gray )
rowcolor = PBM_WHITE; /* arbitrarily make the corner white */
for ( row = 0; row < rows; ++row )
{
if ( gray )
{
color = rowcolor;
rowcolor = 1 - rowcolor;
}
for ( col = 0, bP = bitrow; col < cols; ++col, ++bP )
{
*bP = color;
if ( gray )
color = 1 - color;
}
pbm_writepbmrow( stdout, bitrow, cols, 0 );
}
pm_close( stdout );
exit( 0 );
}