home *** CD-ROM | disk | FTP | other *** search
- /* 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 );
- }
-