mutter/clutter/clutter-fixed.h
Matthew Allum 3afb377c3e 2006-08-29 Matthew Allum <mallum@openedhand.com>
* clutter/clutter-fixed.h:
        Add basic fixed point utility defines and type.

        * clutter/Makefile.am:
        * clutter/clutter-actor.c:
        * clutter/clutter-actor.h:
        * clutter/clutter-group.c:
        * clutter/clutter-stage.c:
        * examples/super-oh.c: (main):
        Add scale API and functionality.
        Rework group sizing. Now group size requests have no effect
        but can be scaled.
2006-08-29 19:09:43 +00:00

67 lines
1.9 KiB
C

/*
* 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