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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 );
- }
-