libpgm1.c
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/* libpgm1.c - pgm 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 "pgm.h"
#include "libpgm.h"
#include "pbm.h"
#include "libpbm.h"
void
pgm_init( argcP, argv )
int* argcP;
char* argv[];
{
pbm_init( argcP, argv );
}
void
pgm_readpgminitrest( file, colsP, rowsP, maxvalP )
FILE* file;
int* colsP;
int* rowsP;
gray* maxvalP;
{
int maxval;
/* Read size. */
*colsP = pbm_getint( file );
*rowsP = pbm_getint( file );
/* Read maxval. */
maxval = pbm_getint( file );
if ( maxval > PGM_MAXMAXVAL )
pm_error( "maxval is too large - try reconfiguring with PGM_BIGGRAYS" );
*maxvalP = maxval;
}
gray pgm_pbmmaxval = 1;
void
pgm_readpgminit( file, colsP, rowsP, maxvalP, formatP )
FILE* file;
int* colsP;
int* rowsP;
int* formatP;
gray* maxvalP;
{
/* Check magic number. */
*formatP = pbm_readmagicnumber( file );
switch ( PGM_FORMAT_TYPE(*formatP) )
{
case PGM_TYPE:
pgm_readpgminitrest( file, colsP, rowsP, maxvalP );
break;
case PBM_TYPE:
pbm_readpbminitrest( file, colsP, rowsP );
*maxvalP = pgm_pbmmaxval;
break;
default:
pm_error( "bad magic number - not a pgm or pbm file" );
}
}
#if __STDC__
void
pgm_readpgmrow( FILE* file, gray* grayrow, int cols, gray maxval, int format )
#else /*__STDC__*/
void
pgm_readpgmrow( file, grayrow, cols, maxval, format )
FILE* file;
gray* grayrow;
int cols;
gray maxval;
int format;
#endif /*__STDC__*/
{
register int col;
register gray* gP;
bit* bitrow;
register bit* bP;
switch ( format )
{
case PGM_FORMAT:
for ( col = 0, gP = grayrow; col < cols; ++col, ++gP )
{
*gP = pbm_getint( file );
#ifdef DEBUG
if ( *gP > maxval )
pm_error( "value out of bounds (%u > %u)", *gP, maxval );
#endif /*DEBUG*/
}
break;
case RPGM_FORMAT:
for ( col = 0, gP = grayrow; col < cols; ++col, ++gP )
{
*gP = pbm_getrawbyte( file );
#ifdef DEBUG
if ( *gP > maxval )
pm_error( "value out of bounds (%u > %u)", *gP, maxval );
#endif /*DEBUG*/
}
break;
case PBM_FORMAT:
case RPBM_FORMAT:
bitrow = pbm_allocrow( cols );
pbm_readpbmrow( file, bitrow, cols, format );
for ( col = 0, gP = grayrow, bP = bitrow; col < cols; ++col, ++gP, ++bP )
*gP = ( *bP == PBM_WHITE ) ? maxval : 0;
pbm_freerow( bitrow );
break;
default:
pm_error( "can't happen" );
}
}
gray**
pgm_readpgm( file, colsP, rowsP, maxvalP )
FILE* file;
int* colsP;
int* rowsP;
gray* maxvalP;
{
gray** grays;
int row;
int format;
pgm_readpgminit( file, colsP, rowsP, maxvalP, &format );
grays = pgm_allocarray( *colsP, *rowsP );
for ( row = 0; row < *rowsP; ++row )
pgm_readpgmrow( file, grays[row], *colsP, *maxvalP, format );
return grays;
}