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PBM_PLUS
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pnm
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libpnm1.c
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1980-12-04
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/* libpnm1.c - pnm utility library part 1
**
** Copyright (C) 1989 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 "pnm.h"
#ifdef PPM
#include "ppm.h"
#include "libppm.h"
#endif PPM
#ifdef PGM
#include "pgm.h"
#include "libpgm.h"
static gray *grayrow;
#endif PGM
#ifdef PBM
#include "pbm.h"
#include "libpbm.h"
static bit *bitrow;
#endif PBM
void
pnm_readpnminit( file, colsP, rowsP, maxvalP, formatP )
FILE *file;
int *colsP, *rowsP, *formatP;
xelval *maxvalP;
{
#ifdef PGM
gray gmaxval;
#endif PGM
/* Check magic number. */
*formatP = pbm_readmagicnumber( file );
switch ( *formatP )
{
#ifdef PPM
case PPM_FORMAT:
case RPPM_FORMAT:
ppm_readppminitrest( file, colsP, rowsP, maxvalP );
break;
#endif PPM
#ifdef PGM
case PGM_FORMAT:
case RPGM_FORMAT:
pgm_readpgminitrest( file, colsP, rowsP, &gmaxval );
*maxvalP = (xelval) gmaxval;
grayrow = pgm_allocrow( *colsP );
break;
#endif PGM
#ifdef PBM
case PBM_FORMAT:
case RPBM_FORMAT:
pbm_readpbminitrest( file, colsP, rowsP );
bitrow = pbm_allocrow( *colsP );
break;
#endif PVM
default:
pm_error( "bad magic number - not a ppm, pgm, or pbm file", 0,0,0,0,0 );
}
}
void
pnm_readpnmrow( file, xelrow, cols, maxval, format )
FILE *file;
xel *xelrow;
xelval maxval;
int cols, format;
{
register int col;
register xel *xP;
#ifdef PGM
register gray *gP;
#endif PGM
#ifdef PBM
register bit *bP;
#endif PBM
switch ( format )
{
#ifdef PPM
case PPM_FORMAT:
case RPPM_FORMAT:
ppm_readppmrow( file, (pixel *) xelrow, cols, (pixval) maxval, format );
break;
#endif PPM
#ifdef PGM
case PGM_FORMAT:
case RPGM_FORMAT:
pgm_readpgmrow( file, grayrow, cols, (gray) maxval, format );
for ( col = 0, xP = xelrow, gP = grayrow; col < cols; col++, xP++, gP++ )
PNM_ASSIGN1( *xP, *gP );
break;
#endif PGM
#ifdef PBM
case PBM_FORMAT:
case RPBM_FORMAT:
pbm_readpbmrow( file, bitrow, cols, format );
for ( col = 0, xP = xelrow, bP = bitrow; col < cols; col++, xP++, bP++ )
PNM_ASSIGN1( *xP, *bP );
break;
#endif PBM
default:
pm_error( "can't happen", 0,0,0,0,0 );
}
}
xel **
pnm_readpnm( file, colsP, rowsP, maxvalP, formatP )
FILE *file;
int *colsP, *rowsP, *formatP;
xelval *maxvalP;
{
xel **xels;
int row;
pnm_readpnminit( file, colsP, rowsP, maxvalP, formatP );
xels = pnm_allocarray( *colsP, *rowsP );
for ( row = 0; row < *rowsP; row++ )
pnm_readpnmrow( file, xels[row], *colsP, *maxvalP, *formatP );
return xels;
}