/*
    This file is part of SGI Format, a File Format plugin for Adobe Photoshop
    Copyright (C) 2003-9 Toby Thain, toby@telegraphics.com.au

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

/* note that Photoshop has this odd behaviour:
   in 16 bit modes, it scales channel values to a range of 0..0x8000
   before passing to plugin - we must allow for this */

unsigned fix16(unsigned x);
void swapbytes(unsigned char *p,int n);

/* if we compile with -opt speed, mrc should inline this */
unsigned fix16(unsigned x){
	/* scale 0..0x8000 to 0..0xffff */
	return ((long)x << 1) - (x >> 15);
}

void swapbytes(unsigned char *p,int n){
	int i;
	unsigned char *q;
	/* swap bytes in words */
	for(i = n, q = p; i--; q += 2){
		unsigned t = q[0];
		q[0] = q[1];
		q[1] = t;
	}
}