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/* pgmtoppm.c - colorize a portable graymap into a portable pixmap
**
** Copyright (C) 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 <string.h>
#include "ppm.h"
int
main( argc, argv )
int argc;
char* argv[];
{
FILE* ifp;
gray* grayrow;
register gray* gP;
pixel p;
pixel* pixelrow;
register pixel* pP;
pixel** mappixels;
int argn, rows, cols, format, maprows, mapcols, mapmaxcolor, row;
register int col;
gray maxval;
pixval mapmaxval;
char* color0;
char* color1;
pixval red0, grn0, blu0, red1, grn1, blu1;
const char* const usage = "<colorspec> [pgmfile]\n <colorspec1>,<colorspec2> [pgmfile]\n -map mapfile [pgmfile]";
ppm_init( &argc, argv );
argn = 1;
mappixels = (pixel**) 0;
if ( argn < argc && argv[argn][0] == '-' && argv[argn][1] != '\0' )
{
if ( pm_keymatch( argv[argn], "-map", 2 ) )
{
++argn;
if ( argn == argc )
pm_usage( usage );
ifp = pm_openr( argv[argn] );
mappixels = ppm_readppm( ifp, &mapcols, &maprows, &mapmaxval );
pm_close( ifp );
mapmaxcolor = maprows * mapcols - 1;
}
else
pm_usage( usage );
++argn;
}
if ( mappixels == (pixel**) 0 )
{
if ( argn == argc )
pm_usage( usage );
color0 = argv[argn];
++argn;
}
if ( argn != argc )
{
ifp = pm_openr( argv[argn] );
++argn;
}
else
ifp = stdin;
if ( argn != argc )
pm_usage( usage );
pgm_readpgminit( ifp, &cols, &rows, &maxval, &format );
grayrow = pgm_allocrow( cols );
if ( mappixels == (pixel**) 0 )
ppm_writeppminit( stdout, cols, rows, (pixval) maxval, 0 );
else
ppm_writeppminit( stdout, cols, rows, mapmaxval, 0 );
pixelrow = ppm_allocrow( cols );
if ( mappixels == (pixel**) 0 )
{
color1 = strchr( color0, '-' );
if ( color1 == 0 )
{
color1 = color0;
red0 = 0;
grn0 = 0;
blu0 = 0;
}
else
{
*color1 = '\0';
++color1;
p = ppm_parsecolor( color0, (pixval) maxval );
red0 = PPM_GETR( p );
grn0 = PPM_GETG( p );
blu0 = PPM_GETB( p );
}
p = ppm_parsecolor( color1, (pixval) maxval );
red1 = PPM_GETR( p );
grn1 = PPM_GETG( p );
blu1 = PPM_GETB( p );
}
for ( row = 0; row < rows; ++row )
{
pgm_readpgmrow( ifp, grayrow, cols, maxval, format );
if ( mappixels == (pixel**) 0 )
{
for ( col = 0, gP = grayrow, pP = pixelrow;
col < cols;
++col, ++gP, ++pP )
PPM_ASSIGN(
*pP,
( red0 * ( maxval - *gP ) + red1 * *gP ) / maxval,
( grn0 * ( maxval - *gP ) + grn1 * *gP ) / maxval,
( blu0 * ( maxval - *gP ) + blu1 * *gP ) / maxval );
}
else
{
register int c;
for ( col = 0, gP = grayrow, pP = pixelrow;
col < cols;
++col, ++gP, ++pP )
{
if ( maxval == mapmaxcolor )
c = *gP;
else
c = *gP * mapmaxcolor / maxval;
*pP = mappixels[c / mapcols][c % mapcols];
}
}
if (!mappixels)
ppm_writeppmrow( stdout, pixelrow, cols, (pixval) maxval, 0 );
else
ppm_writeppmrow( stdout, pixelrow, cols, mapmaxval, 0 );
}
pm_close( ifp );
/* If the program failed, it previously aborted with nonzero completion
code, via various function calls.
*/
return 0;
}
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