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/* pnmdepth.c - change the maxval in a portable pixmap
**
** Copyright (C) 1989, 1991 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 "pnm.h"
static xelval newvals[PNM_MAXMAXVAL+1];
int
main( argc, argv )
int argc;
char* argv[];
{
FILE* ifp;
xel* xelrow;
register xel* xP;
int argn, rows, cols, format, newformat, row;
register int col;
xelval maxval;
int newmaxval;
int i;
char* usage = "newmaxval [pnmfile]";
pnm_init( &argc, argv );
argn = 1;
if ( argn == argc )
pm_usage( usage );
if ( sscanf( argv[argn], "%d", &newmaxval ) != 1 )
pm_usage( usage );
++argn;
if ( newmaxval < 1 )
pm_error( "newmaxval must be >= 1" );
if ( newmaxval > PNM_MAXMAXVAL )
pm_error(
"newmaxval is too large - try reconfiguring with PGM_BIGGRAYS\n or without PPM_PACKCOLORS" );
if ( argn != argc )
{
ifp = pm_openr( argv[argn] );
++argn;
}
else
ifp = stdin;
if ( argn != argc )
pm_usage( usage );
pnm_readpnminit( ifp, &cols, &rows, &maxval, &format );
xelrow = pnm_allocrow( cols );
/* Promote PBM files to PGM. */
if ( PNM_FORMAT_TYPE(format) == PBM_TYPE )
{
newformat = PGM_TYPE;
pm_message( "promoting from PBM to PGM" );
}
else
newformat = format;
for ( i = 0; i <= maxval; ++i )
newvals[i] = ( i * newmaxval + maxval / 2 ) / maxval;
pnm_writepnminit( stdout, cols, rows, newmaxval, newformat, 0 );
for ( row = 0; row < rows; ++row )
{
pnm_readpnmrow( ifp, xelrow, cols, maxval, format );
switch ( PNM_FORMAT_TYPE(format) )
{
case PPM_TYPE:
for ( col = 0, xP = xelrow; col < cols; ++col, ++xP )
PPM_ASSIGN(
*xP, newvals[PPM_GETR(*xP)], newvals[PPM_GETG(*xP)],
newvals[PPM_GETB(*xP)] );
break;
default:
for ( col = 0, xP = xelrow; col < cols; ++col, ++xP )
PNM_ASSIGN1( *xP, newvals[PNM_GET1(*xP)] );
break;
}
pnm_writepnmrow( stdout, xelrow, cols, newmaxval, newformat, 0 );
}
pm_close( ifp );
pm_close( stdout );
exit( 0 );
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.