123 lines
3.9 KiB
C
123 lines
3.9 KiB
C
/*
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* ***** BEGIN GPL LICENSE BLOCK *****
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* The Original Code is Copyright (C) 2012 by Nicholas Bishop
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* All rights reserved.
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*
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* The Original Code is: all of this file.
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*
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* ***** END GPL LICENSE BLOCK *****
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*/
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#ifndef __BLI_BITMAP_H__
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#define __BLI_BITMAP_H__
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/** \file BLI_bitmap.h
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* \ingroup bli
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*/
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typedef unsigned int BLI_bitmap;
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/* warning: the bitmap does not keep track of its own size or check
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* for out-of-bounds access */
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/* internal use */
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/* 2^5 = 32 (bits) */
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#define _BITMAP_POWER 5
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/* 0b11111 */
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#define _BITMAP_MASK 31
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/* number of blocks needed to hold '_tot' bits */
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#define _BITMAP_NUM_BLOCKS(_tot) \
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(((_tot) >> _BITMAP_POWER) + 1)
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/* size (in bytes) used to hold '_tot' bits */
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#define BLI_BITMAP_SIZE(_tot) \
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((size_t)(_BITMAP_NUM_BLOCKS(_tot)) * sizeof(BLI_bitmap))
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/* allocate memory for a bitmap with '_tot' bits; free
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* with MEM_freeN() */
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#define BLI_BITMAP_NEW(_tot, _alloc_string) \
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((BLI_bitmap *)MEM_callocN(BLI_BITMAP_SIZE(_tot), \
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_alloc_string))
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/* allocate a bitmap on the stack */
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#define BLI_BITMAP_NEW_ALLOCA(_tot) \
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((BLI_bitmap *)memset(alloca(BLI_BITMAP_SIZE(_tot)), 0, BLI_BITMAP_SIZE(_tot)))
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/* Allocate using given MemArena */
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#define BLI_BITMAP_NEW_MEMARENA(_mem, _tot) \
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(CHECK_TYPE_INLINE(_mem, MemArena *), \
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((BLI_bitmap *)BLI_memarena_calloc(_mem, BLI_BITMAP_SIZE(_tot))))
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/* get the value of a single bit at '_index' */
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#define BLI_BITMAP_TEST(_bitmap, _index) \
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(CHECK_TYPE_ANY(_bitmap, BLI_bitmap *, const BLI_bitmap *), \
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((_bitmap)[(_index) >> _BITMAP_POWER] & \
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(1u << ((_index) & _BITMAP_MASK))))
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#define BLI_BITMAP_TEST_BOOL(_bitmap, _index) \
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(CHECK_TYPE_ANY(_bitmap, BLI_bitmap *, const BLI_bitmap *), \
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(BLI_BITMAP_TEST(_bitmap, _index) != 0))
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/* set the value of a single bit at '_index' */
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#define BLI_BITMAP_ENABLE(_bitmap, _index) \
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(CHECK_TYPE_ANY(_bitmap, BLI_bitmap *, const BLI_bitmap *), \
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((_bitmap)[(_index) >> _BITMAP_POWER] |= \
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(1u << ((_index) & _BITMAP_MASK))))
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/* clear the value of a single bit at '_index' */
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#define BLI_BITMAP_DISABLE(_bitmap, _index) \
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(CHECK_TYPE_ANY(_bitmap, BLI_bitmap *, const BLI_bitmap *), \
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((_bitmap)[(_index) >> _BITMAP_POWER] &= \
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~(1u << ((_index) & _BITMAP_MASK))))
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/* flip the value of a single bit at '_index' */
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#define BLI_BITMAP_FLIP(_bitmap, _index) \
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(CHECK_TYPE_ANY(_bitmap, BLI_bitmap *, const BLI_bitmap *), \
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((_bitmap)[(_index) >> _BITMAP_POWER] ^= \
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(1u << ((_index) & _BITMAP_MASK))))
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/* set or clear the value of a single bit at '_index' */
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#define BLI_BITMAP_SET(_bitmap, _index, _set) \
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{ \
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CHECK_TYPE(_bitmap, BLI_bitmap *); \
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if (_set) \
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BLI_BITMAP_ENABLE(_bitmap, _index); \
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else \
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BLI_BITMAP_DISABLE(_bitmap, _index); \
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} (void)0
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/* set or clear the value of the whole bitmap (needs size info) */
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#define BLI_BITMAP_SET_ALL(_bitmap, _set, _tot) \
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{ \
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CHECK_TYPE(_bitmap, BLI_bitmap *); \
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if (_set) \
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memset(_bitmap, UCHAR_MAX, BLI_BITMAP_SIZE(_tot)); \
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else \
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memset(_bitmap, 0, BLI_BITMAP_SIZE(_tot)); \
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} (void)0
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/* resize bitmap to have space for '_tot' bits */
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#define BLI_BITMAP_RESIZE(_bitmap, _tot) \
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{ \
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CHECK_TYPE(_bitmap, BLI_bitmap *); \
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(_bitmap) = MEM_reallocN(_bitmap, BLI_BITMAP_SIZE(_tot)); \
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} (void)0
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#endif
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