opj_intmath.h

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/*
 * The copyright in this software is being made available under the 2-clauses 
 * BSD License, included below. This software may be subject to other third 
 * party and contributor rights, including patent rights, and no such rights
 * are granted under this license.
 *
 * Copyright (c) 2002-2014, Universite catholique de Louvain (UCL), Belgium
 * Copyright (c) 2002-2014, Professor Benoit Macq
 * Copyright (c) 2001-2003, David Janssens
 * Copyright (c) 2002-2003, Yannick Verschueren
 * Copyright (c) 2003-2007, Francois-Olivier Devaux 
 * Copyright (c) 2003-2014, Antonin Descampe
 * Copyright (c) 2005, Herve Drolon, FreeImage Team
 * All rights reserved.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
#ifndef __INT_H
#define __INT_H


/* ----------------------------------------------------------------------- */
static INLINE OPJ_INT32 opj_int_min(OPJ_INT32 a, OPJ_INT32 b) {
        return a < b ? a : b;
}

static INLINE OPJ_UINT32 opj_uint_min(OPJ_UINT32 a, OPJ_UINT32 b) {
        return a < b ? a : b;
}

static INLINE OPJ_INT32 opj_int_max(OPJ_INT32 a, OPJ_INT32 b) {
        return (a > b) ? a : b;
}

static INLINE OPJ_UINT32 opj_uint_max(OPJ_UINT32  a, OPJ_UINT32  b) {
        return (a > b) ? a : b;
}

static INLINE OPJ_UINT32 opj_uint_adds(OPJ_UINT32 a, OPJ_UINT32 b) {
        OPJ_UINT64 sum = (OPJ_UINT64)a + (OPJ_UINT64)b;
        return -(OPJ_UINT32)(sum >> 32) | (OPJ_UINT32)sum;
}

static INLINE OPJ_INT32 opj_int_clamp(OPJ_INT32 a, OPJ_INT32 min, OPJ_INT32 max) {
        if (a < min)
                return min;
        if (a > max)
                return max;
        return a;
}
static INLINE OPJ_INT32 opj_int_abs(OPJ_INT32 a) {
        return a < 0 ? -a : a;
}
static INLINE OPJ_INT32 opj_int_ceildiv(OPJ_INT32 a, OPJ_INT32 b) {
        assert(b);
        return (a + b - 1) / b;
}

static INLINE OPJ_UINT32  opj_uint_ceildiv(OPJ_UINT32  a, OPJ_UINT32  b) {
        assert(b);
        return (a + b - 1) / b;
}

static INLINE OPJ_INT32 opj_int_ceildivpow2(OPJ_INT32 a, OPJ_INT32 b) {
        return (OPJ_INT32)((a + (OPJ_INT64)(1 << b) - 1) >> b);
}

static INLINE OPJ_UINT32 opj_uint_ceildivpow2(OPJ_UINT32 a, OPJ_UINT32 b) {
        return (OPJ_UINT32)((a + (OPJ_UINT64)(1U << b) - 1U) >> b);
}

static INLINE OPJ_INT32 opj_int_floordivpow2(OPJ_INT32 a, OPJ_INT32 b) {
        return a >> b;
}
static INLINE OPJ_INT32 opj_int_floorlog2(OPJ_INT32 a) {
        OPJ_INT32 l;
        for (l = 0; a > 1; l++) {
                a >>= 1;
        }
        return l;
}
static INLINE OPJ_UINT32  opj_uint_floorlog2(OPJ_UINT32  a) {
        OPJ_UINT32  l;
        for (l = 0; a > 1; ++l)
        {
                a >>= 1;
        }
        return l;
}

static INLINE OPJ_INT32 opj_int_fix_mul(OPJ_INT32 a, OPJ_INT32 b) {
        OPJ_INT64 temp = (OPJ_INT64) a * (OPJ_INT64) b ;
        temp += 4096;
        assert((temp >> 13) <= (OPJ_INT64)0x7FFFFFFF);
        assert((temp >> 13) >= (-(OPJ_INT64)0x7FFFFFFF - (OPJ_INT64)1));
        return (OPJ_INT32) (temp >> 13);
}

static INLINE OPJ_INT32 opj_int_fix_mul_t1(OPJ_INT32 a, OPJ_INT32 b) {
        OPJ_INT64 temp = (OPJ_INT64) a * (OPJ_INT64) b ;
        temp += 4096;
        assert((temp >> (13 + 11 - T1_NMSEDEC_FRACBITS)) <= (OPJ_INT64)0x7FFFFFFF);
        assert((temp >> (13 + 11 - T1_NMSEDEC_FRACBITS)) >= (-(OPJ_INT64)0x7FFFFFFF - (OPJ_INT64)1));
        return (OPJ_INT32) (temp >> (13 + 11 - T1_NMSEDEC_FRACBITS)) ;
}

/* ----------------------------------------------------------------------- */

#endif