/*
 * Clutter.
 *
 * An OpenGL based 'interactive canvas' library.
 *
 * Authored By Matthew Allum  <mallum@openedhand.com>
 *
 * Copyright (C) 2006 OpenedHand
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#ifndef _HAVE_CLUTTER_FIXED_H
#define _HAVE_CLUTTER_FIXED_H

#include <glib.h>

G_BEGIN_DECLS

typedef gint32 ClutterFixed;

#define CFX_Q     16		/* Decimal part size in bits */
#define CFX_ONE   (1 << CFX_Q)	/* 1 */
#define CFX_MAX   0x7fffffff
#define CFX_MIN   0x80000000

#define CLUTTER_FIXED_TO_FLOAT(x) ((float)((x)/65536.0))

#define CLUTTER_FIXED_TO_DOUBLE(x) ((double)((x)/65536.0))

#define CLUTTER_FLOAT_TO_FIXED(x)   \
  ( (ABS(x) > 32767.0) ?            \
            (((x)/(x))*0x7fffffff)  \
          : ((long)((x) * 65536.0  + ((x) < 0 ? -0.5 : 0.5))) )

#define CLUTTER_INT_TO_FIXED(x) ((x) << CFX_Q)

#define CLUTTER_FIXED_INT(x) ((x) >> CFX_Q)

#define CLUTTER_FIXED_FRACTION(x) ((x) & ((1 << CFX_Q) - 1))

#define CLUTTER_FIXED_FLOOR(x) \
   (((x) >= 0) ? ((x) >> CFX_Q) : ~((~(x)) >> CFX_Q))

#define CLUTTER_FIXED_CEIL(x) CLUTTER_FIXED_FLOOR(x + 0xffff) 

#define CLUTTER_FIXED_MUL(x,y) ((x) >> 8) * ((y) >> 8)

#define CLUTTER_FIXED_DIV(x,y) ((((x) << 8)/(y)) << 8)

G_END_DECLS

#endif