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/* qrttoppm.c - read a QRT ray-tracer output file and produce a portable pixmap
**
** 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 "ppm.h"
int
main( argc, argv )
int argc;
char* argv[];
{
FILE* ifp;
register pixel* pixelrow;
int rows, cols, row, col;
pixval maxval;
unsigned char* buf;
ppm_init( &argc, argv );
if ( argc > 2 )
pm_usage( "[qrtfile]" );
if ( argc == 2 )
ifp = pm_openr( argv[1] );
else
ifp = stdin;
/* Read in the QRT file. First the header. */
cols = getc( ifp );
cols += getc( ifp ) << 8;
rows = getc( ifp );
rows += getc( ifp ) << 8;
if ( cols <= 0 || rows <= 0 )
pm_error( "invalid size: %d %d", cols, rows );
maxval = 255;
ppm_writeppminit( stdout, cols, rows, maxval, 0 );
pixelrow = ppm_allocrow( cols );
buf = (unsigned char *) malloc( 3 * cols );
if ( buf == (unsigned char *) 0 )
pm_error( "out of memory" );
for ( row = 0; row < rows; row++ )
{
(void) getc( ifp ); /* discard */
(void) getc( ifp ); /* linenum */
if ( fread( buf, 3 * cols, 1, ifp ) != 1 )
pm_error( "EOF / read error" );
for ( col = 0; col < cols; col++ )
PPM_ASSIGN(
pixelrow[col], buf[col], buf[cols + col], buf[2 * cols + col] );
ppm_writeppmrow( stdout, pixelrow, cols, maxval, 0 );
}
pm_close( ifp );
pm_close( stdout );
exit( 0 );
}
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