blf_util.c

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/*
 * 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) 2009 Blender Foundation.
 * All rights reserved.
 */
 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
#include "BLI_utildefines.h"
 
#include "blf_internal.h"
 
unsigned int blf_next_p2(unsigned int x)
{
  x -= 1;
  x |= (x >> 16);
  x |= (x >> 8);
  x |= (x >> 4);
  x |= (x >> 2);
  x |= (x >> 1);
  x += 1;
  return x;
}
 
unsigned int blf_hash(unsigned int val)
{
  unsigned int key;
 
  key = val;
  key += ~(key << 16);
  key ^= (key >> 5);
  key += (key << 3);
  key ^= (key >> 13);
  key += ~(key << 9);
  key ^= (key >> 17);
  return key % 257;
}