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/* mtvtoppm.c - read an MTV 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;
pixel* pixelrow;
register pixel* pP;
int rows, cols, row, col;
pixval maxval;
#define MAXLINE 500
char line[MAXLINE];
unsigned char buf[3];
ppm_init( &argc, argv );
if ( argc > 2 )
pm_usage( "[mtvfile]" );
if ( argc == 2 )
ifp = pm_openr( argv[1] );
else
ifp = stdin;
/* Read in the MTV file. First the header. */
if ( fgets( line, MAXLINE, ifp ) == NULL )
pm_error( "unable to read MTV file header" );
if ( sscanf( line, "%d%d", &cols, &rows ) != 2 )
pm_error( "unable to parse MTV file header" );
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 );
for ( row = 0; row < rows; row++ )
{
for ( col = 0, pP = pixelrow; col < cols; col++, pP++ )
{
if ( fread( buf, sizeof(buf), 1, ifp ) != 1 )
pm_error( "EOF / read error" );
PPM_ASSIGN( *pP, buf[0], buf[1], buf[2] );
}
ppm_writeppmrow( stdout, pixelrow, cols, maxval, 0 );
}
pm_close( ifp );
pm_close( stdout );
exit( 0 );
}
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