shithub: dav1d

ref: 92b7e8bd536228b145e6c315987a4908bea3b38a
dir: /include/common/intops.h/

/*
 * Copyright © 2018, VideoLAN and dav1d authors
 * Copyright © 2018, Two Orioles, LLC
 * 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 __DAV1D_COMMON_INTOPS_H__
#define __DAV1D_COMMON_INTOPS_H__

#include <stdint.h>

#include "common/attributes.h"

static inline int imax(const int a, const int b) {
    return a > b ? a : b;
}

static inline int imin(const int a, const int b) {
    return a < b ? a : b;
}

static inline int iclip(const int v, const int min, const int max) {
    return v < min ? min : v > max ? max : v;
}

static inline int iclip_u8(const int v) {
    return iclip(v, 0, 255);
}

static inline int apply_sign(const int v, const int s) {
    return s < 0 ? -v : v;
}

static inline int ulog2(const unsigned v) {
    return 31 - clz(v);
}

static inline int u64log2(const uint64_t v) {
    return 63 - clzll(v);
}

static inline unsigned rl16(const uint8_t *const ptr) {
    return (ptr[1] << 8) | ptr[0];
}

static inline unsigned rl32(const uint8_t *const ptr) {
    return (rl16(&ptr[2]) << 16) | rl16(ptr);
}

static inline unsigned inv_recenter(const unsigned r, const unsigned v) {
    if (v > (r << 1))
        return v;
    else if ((v & 1) == 0)
        return (v >> 1) + r;
    else
        return r - ((v + 1) >> 1);
}

#endif /* __DAV1D_COMMON_INTOPS_H__ */