maroontree 0.1.8

AV1 image & AV2 video and image encoder
Documentation 
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/*
 * // Copyright (c) Radzivon Bartoshyk 6/2026. 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.
 * //
 * // 3.  Neither the name of the copyright holder 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 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 HOLDER 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.
 */

use std::sync::OnceLock;

#[allow(unused)]
fn fwht_raw(input: &mut [i32; 16]) {
    let mut mid = [0i32; 16];
    for i in 0..4 {
        let (a0, b0, c0, d0) = (input[i], input[4 + i], input[8 + i], input[12 + i]);
        let mut a1 = a0 + b0;
        let mut d1 = d0 - c0;
        let e1 = (a1 - d1) >> 1;
        let b1 = e1 - b0;
        let c1 = e1 - c0;
        a1 -= c1;
        d1 += b1;
        mid[i] = a1;
        mid[4 + i] = c1;
        mid[8 + i] = d1;
        mid[12 + i] = b1;
    }
    for i in 0..4 {
        let base = i * 4;
        let (a0, b0, c0, d0) = (mid[base], mid[base + 1], mid[base + 2], mid[base + 3]);
        let mut a1 = a0 + b0;
        let mut d1 = d0 - c0;
        let e1 = (a1 - d1) >> 1;
        let b1 = e1 - b0;
        let c1 = e1 - c0;
        a1 -= c1;
        d1 += b1;
        input[base] = a1;
        input[base + 1] = c1;
        input[base + 2] = d1;
        input[base + 3] = b1;
    }
}

#[allow(unused)]
fn transpose(m: &[i32; 16]) -> [i32; 16] {
    let mut o = [0i32; 16];
    for r in 0..4 {
        for c in 0..4 {
            o[c * 4 + r] = m[r * 4 + c];
        }
    }
    o
}

#[allow(unused)]
fn wht_scalar(resid: &mut [i32; 16]) {
    fwht_raw(resid);
    let t = transpose(resid);
    resid.copy_from_slice(&t)
}

type WhtFn = fn(&mut [i32; 16]);
static WHT: OnceLock<WhtFn> = OnceLock::new();

#[cfg(all(target_arch = "aarch64", feature = "neon"))]
fn fwht_raw_neon_wrap(input: &mut [i32; 16]) {
    crate::neon::fwht_raw_neon(input);
}

#[cfg(all(target_arch = "x86_64", feature = "avx"))]
fn fwht_raw_avx2_wrap(input: &mut [i32; 16]) {
    unsafe { crate::avx::fwht_raw_avx2(input) }
}

#[inline]
fn resolve_wht() -> WhtFn {
    *WHT.get_or_init(|| {
        let mut _f: WhtFn = wht_scalar;
        #[cfg(all(target_arch = "aarch64", feature = "neon"))]
        {
            _f = fwht_raw_neon_wrap;
        }
        #[cfg(all(target_arch = "x86_64", feature = "avx"))]
        {
            if std::is_x86_feature_detected!("avx2") {
                _f = fwht_raw_avx2_wrap;
            }
        }
        _f
    })
}

pub(crate) fn levels_from_resid(resid: &mut [i32; 16]) {
    resolve_wht()(resid);
}