dbm/src/h_log2.c
author Vladimir Vukicevic <vladimir@pobox.com>
Sun, 09 Nov 2008 15:40:55 -0800
changeset 21539 5975189375dac77d390bb0f45ab347b924b349d9
parent 15273 437dcecc6377817753fd3bdce409c69f978ac2e4
child 27007 e4c0eed67bf9f1526921a6f0b13d6be214d592c7
permissions -rw-r--r--
b=455513; add optional flag to allow converting a DDB to a DIB internally, if the surface is every used as a source; r=jmuizelaar If a DDB is used as a source for an operation that can't be handled natively by GDI, we end up needing to take a really slow path (creating a temporary surface for acquire_source) for each operation. If we convert the DDB to a DIB, we then end up having a real image buffer and can hand things off to pixman directly. This isn't the default mode because I'm not sure if there are cases where a DDB is explicitly needed (e.g. for printing), and it would change current cairo behaviour. It might become the default at some point in the future.

/*-
 * Copyright (c) 1990, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Margo Seltzer.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. ***REMOVED*** - see 
 *    ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)hash_log2.c	8.2 (Berkeley) 5/31/94";
#endif /* LIBC_SCCS and not lint */

#include "watcomfx.h"

#include <stdio.h>
#ifndef macintosh
#include <sys/types.h>
#endif
#include "mcom_db.h"

uint32 __log2(uint32 num)
{
	register uint32 i, limit;

	limit = 1;
	for (i = 0; limit < num; limit = limit << 1, i++) {}
	return (i);
}