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/*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* The Original Code is Copyright (C) 2012 by Nicholas Bishop
* All rights reserved.
*
* The Original Code is: all of this file.
*
* ***** END GPL LICENSE BLOCK *****
*/
#ifndef __BLI_BITMAP_H__
#define __BLI_BITMAP_H__
typedef unsigned int* BLI_bitmap;
/* warning: the bitmap does not keep track of its own size or check
* for out-of-bounds access */
/* internal use */
/* 2^5 = 32 (bits) */
#define BLI_BITMAP_POWER 5
/* 0b11111 */
#define BLI_BITMAP_MASK 31
/* number of blocks needed to hold '_tot' bits */
#define BLI_BITMAP_NUM_BLOCKS(_tot) \
(((_tot) >> BLI_BITMAP_POWER) + 1)
/* size (in bytes) used to hold '_tot' bits */
#define BLI_BITMAP_SIZE(_tot) \
(BLI_BITMAP_NUM_BLOCKS(_tot) * sizeof(unsigned int))
/* allocate memory for a bitmap with '_tot' bits; free
* with MEM_freeN() */
#define BLI_BITMAP_NEW(_tot, _alloc_string) \
((BLI_bitmap)MEM_callocN(BLI_BITMAP_SIZE(_tot), \
_alloc_string))
/* get the value of a single bit at '_index' */
#define BLI_BITMAP_GET(_bitmap, _index) \
((_bitmap)[(_index) >> BLI_BITMAP_POWER] & \
(1 << ((_index) & BLI_BITMAP_MASK)))
/* set the value of a single bit at '_index' */
#define BLI_BITMAP_SET(_bitmap, _index) \
((_bitmap)[(_index) >> BLI_BITMAP_POWER] |= \
(1 << ((_index) & BLI_BITMAP_MASK)))
/* clear the value of a single bit at '_index' */
#define BLI_BITMAP_CLEAR(_bitmap, _index) \
((_bitmap)[(_index) >> BLI_BITMAP_POWER] &= \
~(1 << ((_index) & BLI_BITMAP_MASK)))
/* set or clear the value of a single bit at '_index' */
#define BLI_BITMAP_MODIFY(_bitmap, _index, _set) \
do { \
if(_set) \
BLI_BITMAP_SET(_bitmap, _index); \
else \
BLI_BITMAP_CLEAR(_bitmap, _index); \
} while(0)
/* resize bitmap to have space for '_tot' bits */
#define BLI_BITMAP_RESIZE(_bitmap, _tot) \
(_bitmap) = MEM_reallocN(_bitmap, BLI_BITMAP_SIZE(_tot))
#endif
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