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/*
* $Id$
*
* ***** 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) 2009 Blender Foundation.
* All rights reserved.
*
*
* Contributor(s): Blender Foundation
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file blender/blenfont/intern/blf_util.c
* \ingroup blf
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "blf_internal.h"
#include "BLI_string_utf8.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;
}
/*
* This function is from Imlib2 library (font_main.c), a
* library that does image file loading and saving as well
* as rendering, manipulation, arbitrary polygon support, etc.
*
* Copyright (C) 2000 Carsten Haitzler and various contributors
* The original name: imlib_font_utf8_get_next
* more info here: http://docs.enlightenment.org/api/imlib2/html/
*/
unsigned int blf_utf8_next(const char *buf, size_t *iindex)
{
/* Reads UTF8 bytes from 'buf', starting at 'index' and
* returns the code point of the next valid code point.
* 'index' is updated ready for the next call.
*
* Returns 0 to indicate an error (e.g. invalid UTF8)
*/
int index= *iindex, len, r;
unsigned char d, d2, d3, d4;
d= buf[index++];
if (!d)
return BLI_UTF8_ERR;
while (buf[index] && ((buf[index] & 0xc0) == 0x80))
index++;
len= index - *iindex;
if (len == 1)
r= d;
else if (len == 2) {
/* 2 byte */
d2= buf[*iindex + 1];
r= d & 0x1f; /* copy lower 5 */
r <<= 6;
r |= (d2 & 0x3f); /* copy lower 6 */
}
else if (len == 3) {
/* 3 byte */
d2= buf[*iindex + 1];
d3= buf[*iindex + 2];
r= d & 0x0f; /* copy lower 4 */
r <<= 6;
r |= (d2 & 0x3f);
r <<= 6;
r |= (d3 & 0x3f);
}
else {
/* 4 byte */
d2= buf[*iindex + 1];
d3= buf[*iindex + 2];
d4= buf[*iindex + 3];
r= d & 0x0f; /* copy lower 4 */
r <<= 6;
r |= (d2 & 0x3f);
r <<= 6;
r |= (d3 & 0x3f);
r <<= 6;
r |= (d4 & 0x3f);
}
*iindex= index;
return r;
}
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