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- /* pbmtogem.c - read a portable bitmap and produce a GEM .img file
- **
- ** Author: David Beckemeyer (bdt!david)
- **
- ** Much of the code for this program was taken from other
- ** pbmto* programs. I just modified the code to produce
- ** a .img header and generate .img "Bit Strings".
- **
- ** Thanks to Diomidis D. Spinellis for the .img header format.
- **
- ** Copyright (C) 1988 by David Beckemeyer (bdt!david) and 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"
-
- /*
- * File header structure
- */
- struct header {
- short version;/* Image file version */
- unsigned short hlen; /* Header length in bytes */
- unsigned short planes; /* Number of planes */
- unsigned short patlen; /* Pattern definition length (bytes) */
- unsigned short pxlen; /* Pixel height (microns) */
- unsigned short pxht; /* Pixel height (microns) */
- unsigned short linewid;/* Scan line width (pixels) */
- unsigned short nitems; /* Number of scan line items */
- };
-
- #define MAXCOL 60
- static unsigned short outrow[MAXCOL];
-
- static void putinit ARGS(( struct header* hdr ));
- static void putbit ARGS(( bit b ));
- static void putrest ARGS(( void ));
- static void putitem ARGS(( void ));
- static void putrow ARGS(( void ));
-
- int
- main( argc, argv )
- int argc;
- char* argv[];
- {
- FILE* ifp;
- bit* bitrow;
- register bit* bP;
- int rows, cols, format, row, col, pad;
- struct header hd;
-
-
- pbm_init( &argc, argv );
-
- if ( argc > 2 )
- pm_usage( "[pbmfile]" );
-
- if ( argc == 2 )
- ifp = pm_openr( argv[1] );
- else
- ifp = stdin;
-
- pbm_readpbminit( ifp, &cols, &rows, &format );
-
- if (cols > MAXCOL * 16)
- cols = MAXCOL * 16;
-
- bitrow = pbm_allocrow( cols );
-
- hd.version = 1; /* Image file version */
- hd.hlen = 16; /* Header length in bytes */
- hd.planes = 1; /* Number of planes */
- hd.patlen = 2; /* Pattern definition length (bytes) */
- hd.pxlen = 372; /* Pixel height (microns) */
- hd.pxht = 372; /* Pixel height (microns) */
- hd.linewid = ((cols + 15) / 16) * 16; /* Scan line width (pixels) */
- hd.nitems = rows; /* Number of scan line items */
-
- pad = hd.linewid - cols;
-
- putinit( &hd );
- for ( row = 0; row < rows; ++row )
- {
- pbm_readpbmrow( ifp, bitrow, cols, format );
- for ( col = 0, bP = bitrow; col < cols; ++col, ++bP )
- putbit( *bP );
- for ( col = 0; col < pad; ++col )
- putbit( 0 );
- }
-
- pm_close( ifp );
-
- putrest( );
-
- exit( 0 );
- }
-
- static short item, outcol, outmax;
- static short bitsperitem, bitshift;
-
- static void
- putinit( hdr )
- struct header* hdr;
- {
- fwrite( hdr, 32, 1, stdout );
- item = 0;
- bitsperitem = 0;
- bitshift = 15;
- outcol = 0;
- outmax = hdr->linewid / 16;
- }
-
- #if __STDC__
- static void
- putbit( bit b )
- #else /*__STDC__*/
- static void
- putbit( b )
- bit b;
- #endif /*__STDC__*/
- {
- if ( bitsperitem == 16 )
- putitem( );
- ++bitsperitem;
- if ( b == PBM_BLACK )
- item += 1 << bitshift;
- --bitshift;
- }
-
- static void
- putrest( )
- {
- if ( bitsperitem > 0 )
- putitem( );
- if ( outcol > 0 )
- putrow( );
- }
-
- static void
- putitem( )
- {
- outrow[outcol++] = item;
- if (outcol >= outmax)
- putrow( );
- item = 0;
- bitsperitem = 0;
- bitshift = 15;
- }
-
- static void
- putrow( )
- {
- (void) putc(0x80, stdout); /* a Bit string */
- (void) putc(outcol*2, stdout); /* count */
- fwrite( outrow, outcol*2, 1, stdout );
- outcol = 0;
- }
-