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/* ppmchange.c - change a given color to another
**
** Copyright (C) 1991 by Wilson H. Bent, Jr.
**
** 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.
**
** Modified by Alberto Accomazzi (alberto@cfa.harvard.edu).
** 28 Jan 94 - Added support for multiple color substitution.
*/
#include "ppm.h"
#define TCOLS 256
int
main( argc, argv )
int argc;
char* argv[];
{
FILE* ifp;
int argn, format, row;
register int col, i, replaced;
int rows, cols, ncolors;
pixel* prow;
pixel color0[TCOLS], color1[TCOLS];
pixval maxval;
char* usage = "<oldcolor> <newcolor> [...] [ppmfile]";
ppm_init( &argc, argv );
argn = 1;
if ( argn == argc )
pm_usage( usage );
for ( i = 0; argn < argc - 1 && i < TCOLS; i++ )
{
color0[i] = ppm_parsecolor( argv[argn], PPM_MAXMAXVAL );
++argn;
if ( argn == argc )
pm_usage( usage );
color1[i] = ppm_parsecolor( argv[argn], PPM_MAXMAXVAL );
++argn;
}
ncolors = i;
if ( argn == argc - 1 )
ifp = pm_openr( argv[argn] );
else
ifp = stdin;
ppm_readppminit( ifp, &cols, &rows, &maxval, &format );
ppm_writeppminit( stdout, cols, rows, maxval, 0 );
prow = ppm_allocrow( cols );
/* Scan for the desired color */
for ( row = 0; row < rows; ++row )
{
ppm_readppmrow( ifp, prow, cols, maxval, format );
for ( col = 0; col < cols; ++col )
for ( i = 0, replaced = 0; i < ncolors && !replaced; i++ )
if ( replaced = PPM_EQUAL( prow[col], color0[i] ) )
PPM_ASSIGN( prow[col],
PPM_GETR( color1[i] ),
PPM_GETG( color1[i] ),
PPM_GETB( color1[i] ) );
ppm_writeppmrow( stdout, prow, cols, maxval, 0 );
}
pm_close( ifp );
exit( 0 );
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.