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jpc_math.h (4253B)

      1 /*
      2  * Copyright (c) 2001-2002 Michael David Adams.
      3  * All rights reserved.
      4  */
      5 
      6 /* __START_OF_JASPER_LICENSE__
      7  * 
      8  * JasPer License Version 2.0
      9  * 
     10  * Copyright (c) 1999-2000 Image Power, Inc.
     11  * Copyright (c) 1999-2000 The University of British Columbia
     12  * Copyright (c) 2001-2003 Michael David Adams
     13  * 
     14  * All rights reserved.
     15  * 
     16  * Permission is hereby granted, free of charge, to any person (the
     17  * "User") obtaining a copy of this software and associated documentation
     18  * files (the "Software"), to deal in the Software without restriction,
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     21  * persons to whom the Software is furnished to do so, subject to the
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     24  * 1.  The above copyright notices and this permission notice (which
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     29  * promote products derived from the Software without specific prior
     30  * written permission.
     31  * 
     32  * THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS
     33  * LICENSE.  NO USE OF THE SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER
     34  * THIS DISCLAIMER.  THE SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS
     35  * "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
     36  * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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     40  * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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     50  * IS NOT FAULT-TOLERANT AND IS NOT INTENDED FOR USE IN MISSION-CRITICAL
     51  * SYSTEMS, SUCH AS THOSE USED IN THE OPERATION OF NUCLEAR FACILITIES,
     52  * AIRCRAFT NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL
     53  * SYSTEMS, DIRECT LIFE SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH
     54  * THE FAILURE OF THE SOFTWARE OR SYSTEM COULD LEAD DIRECTLY TO DEATH,
     55  * PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH
     56  * RISK ACTIVITIES").  THE COPYRIGHT HOLDERS SPECIFICALLY DISCLAIM ANY
     57  * EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES.
     58  * 
     59  * __END_OF_JASPER_LICENSE__
     60  */
     61 
     62 #ifndef	JPC_MATH_H
     63 #define	JPC_MATH_H
     64 
     65 /******************************************************************************\
     66 * Includes
     67 \******************************************************************************/
     68 
     69 #include	<assert.h>
     70 
     71 /******************************************************************************\
     72 * Macros
     73 \******************************************************************************/
     74 
     75 /* Compute the floor of the quotient of two integers. */
     76 #define	JPC_FLOORDIV(x, y)	((x) / (y))
     77 
     78 /* Compute the ceiling of the quotient of two integers. */
     79 #define	JPC_CEILDIV(x, y)	(((x) + (y) - 1) / (y))
     80 
     81 /* Compute the floor of (x / 2^y). */
     82 #define	JPC_FLOORDIVPOW2(x, y)	((x) >> (y))
     83 
     84 /* Compute the ceiling of (x / 2^y). */
     85 #define	JPC_CEILDIVPOW2(x, y)	(((x) + (1 << (y)) - 1) >> (y))
     86 
     87 /******************************************************************************\
     88 * Functions.
     89 \******************************************************************************/
     90 
     91 /* Calculate the bit position of the first leading one in a nonnegative
     92   integer. */
     93 int jpc_firstone(int x);
     94 
     95 /* Calculate the integer quantity floor(log2(x)), where x is a positive
     96   integer. */
     97 int jpc_floorlog2(int x);
     98 
     99 #endif