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/* pgmtolispm.c - read a pgm and write a file acceptable to the
** tv:read-bit-array-file function of TI Explorer and Symbolics Lisp Machines.
**
** Written by Jamie Zawinski based on code (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.
**
** When one writes a multi-plane bitmap with tv:write-bit-array-file, it is
** usually a color image; but a color map is not written in the file, so we
** treat this as a graymap instead. To convert a color image to Lispm
** format, you must convert it to a pgm, and hand-edit a color map... Ick.
**
** Feb 2010 afu
** Added dimension check to prevent short int from overflowing
** Changed code style (ANSI-style function definitions, etc.)
*/
#include <stdio.h>
#include "pgm.h"
#define LISPM_MAGIC "This is a BitMap file"
#define INT16MAX 32767
static unsigned int item;
static unsigned int bitsperitem, maxbitsperitem, bitshift;
static int
depth_to_word_size (int const depth) {
/* Lispm architecture specific - if a bitmap is written */
/* out with a depth of 5, it really has a depth of 8, and */
/* is stored that way in the file. */
if (depth==0 || depth==1) return ( 1);
else if (depth == 2) return ( 2);
else if (depth <= 4) return ( 4);
else if (depth <= 8) return ( 8);
else if (depth <= 16) return (16);
else if (depth <= 32) return (32);
else {
pm_error( "depth was %d, which is not in the range 1-32", depth );
return(-1); /* Should never reach here */
}
}
static void
putinit( int const cols, int const rows, int const depth )
{
int i;
int const cols32 = ( ( cols + 31 ) / 32 ) * 32;
/* Lispms are able to write bit files that are not mod32 wide, but we */
/* don't. This should be ok, since bit arrays which are not mod32 wide */
/* are pretty useless on a lispm (can't hand them to bitblt). */
if( rows>INT16MAX || cols>INT16MAX || cols32>INT16MAX )
pm_error ("Input image is too large.");
printf(LISPM_MAGIC);
pm_writelittleshort( stdout, cols );
pm_writelittleshort( stdout, rows );
pm_writelittleshort( stdout, cols32 );
putchar(depth & 0xFF);
for ( i = 0; i < 9; ++i )
putchar( 0 ); /* pad bytes */
item = 0;
bitsperitem = 0;
maxbitsperitem = depth_to_word_size( depth );
bitshift = 0;
}
static void
putitem( )
{
pm_writelittlelong( stdout, ~item );
item = 0;
bitsperitem = 0;
bitshift = 0;
}
static void
putval( gray const b )
{
if ( bitsperitem == 32 )
putitem( );
item = item | ( b << bitshift );
bitsperitem = bitsperitem + maxbitsperitem;
bitshift = bitshift + maxbitsperitem;
}
static void
putrest( )
{
if ( bitsperitem > 0 )
putitem( );
}
int
main( int argc, char * argv[] )
{
FILE* ifp;
gray *grayrow;
register gray* gP;
int rows, cols, depth, format, padright, row, col;
gray maxval;
pgm_init( &argc, argv );
if ( argc > 2 )
pm_usage( "[pgmfile]" );
if ( argc == 2 )
ifp = pm_openr( argv[1] );
else
ifp = stdin;
pgm_readpgminit( ifp, &cols, &rows, &maxval, &format );
grayrow = pgm_allocrow( cols );
depth = pm_maxvaltobits( maxval );
/* Compute padding to round cols up to the nearest multiple of 32. */
padright = ( ( cols + 31 ) / 32 ) * 32 - cols;
putinit( cols, rows, depth );
for ( row = 0; row < rows; ++row )
{
pgm_readpgmrow( ifp, grayrow, cols, maxval, format );
for ( col = 0, gP = grayrow; col < cols; ++col, ++gP )
putval( *gP );
for ( col = 0; col < padright; ++col )
putval( 0 );
}
pm_close( ifp );
putrest( );
exit( 0 );
}
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