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/* qrttoppm.c - read a QRT ray-tracer output file and produce a PPM
**
** 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 "mallocvar.h"
#include "ppm.h"
int
main(int argc, const char ** argv) {
FILE * ifP;
pixel * pixelrow;
unsigned int rows, cols;
unsigned int row;
pixval maxval;
unsigned char * buf;
pm_proginit(&argc, argv);
if (argc-1 > 1)
pm_error("Too many arguments (%u). The only possible argument "
"is the input file name", argc-1);
if (argc-1 >= 1)
ifP = pm_openr(argv[1]);
else
ifP = stdin;
/* Read in the QRT file. First the header. */
cols = (unsigned char)getc(ifP);
cols += (unsigned char)getc(ifP) << 8;
rows = (unsigned char)getc(ifP);
rows += (unsigned char)getc(ifP) << 8;
if (cols <= 0 || rows <= 0)
pm_error("Invalid size: %u %u", cols, rows);
maxval = 255;
ppm_writeppminit(stdout, cols, rows, maxval, 0);
pixelrow = ppm_allocrow(cols);
MALLOCARRAY(buf, 3 * cols);
if (!buf)
pm_error("Failed to allocate buffer for %u columns", cols);
for (row = 0; row < rows; ++row) {
unsigned int col;
getc(ifP); /* discard */
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);
}
free(buf);
ppm_freerow(pixelrow);
pm_close(ifP);
pm_close(stdout);
exit(0);
}
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