yuv 0.8.12

/*
 * Copyright (c) Radzivon Bartoshyk, 10/2024. 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 crate::internals::ProcessedOffset;
use crate::sse::{_mm_load_deinterleave_rgb_for_yuv, sse_pairwise_avg_epi8_j};
use crate::yuv_support::{CbCrForwardTransform, YuvChromaRange, YuvNVOrder, YuvSourceChannels};
#[cfg(target_arch = "x86")]
use std::arch::x86::*;
#[cfg(target_arch = "x86_64")]
use std::arch::x86_64::*;
use std::mem::MaybeUninit;

pub(crate) fn sse_rgba_to_nv_row420<
    const ORIGIN_CHANNELS: u8,
    const UV_ORDER: u8,
    const PRECISION: i32,
>(
    y_plane0: &mut [u8],
    y_plane1: &mut [u8],
    uv_plane: &mut [u8],
    rgba0: &[u8],
    rgba1: &[u8],
    width: u32,
    range: &YuvChromaRange,
    transform: &CbCrForwardTransform<i32>,
    start_cx: usize,
    start_ux: usize,
) -> ProcessedOffset {
    unsafe {
        sse_rgba_to_nv_row_impl420::<ORIGIN_CHANNELS, UV_ORDER, PRECISION>(
            y_plane0, y_plane1, uv_plane, rgba0, rgba1, width, range, transform, start_cx, start_ux,
        )
    }
}

#[inline(always)]
unsafe fn encode_16_part<const ORIGIN_CHANNELS: u8, const UV_ORDER: u8, const PRECISION: i32>(
    src0: &[u8],
    src1: &[u8],
    y_dst0: &mut [u8],
    y_dst1: &mut [u8],
    uv_dst: &mut [u8],
    range: &YuvChromaRange,
    transform: &CbCrForwardTransform<i32>,
) {
    let order: YuvNVOrder = UV_ORDER.into();
    let (r_values0, g_values0, b_values0) =
        _mm_load_deinterleave_rgb_for_yuv::<ORIGIN_CHANNELS>(src0.as_ptr());

    const V_S: i32 = 4;
    const A_E: i32 = 2;

    let r0lw = _mm_unpacklo_epi8(r_values0, r_values0);
    let r0hw = _mm_unpackhi_epi8(r_values0, r_values0);
    let g0lw = _mm_unpacklo_epi8(g_values0, g_values0);
    let g0hw = _mm_unpackhi_epi8(g_values0, g_values0);
    let b0lw = _mm_unpacklo_epi8(b_values0, b_values0);
    let b0hw = _mm_unpackhi_epi8(b_values0, b_values0);

    let r0_lo16 = _mm_srli_epi16::<V_S>(r0lw);
    let r0_hi16 = _mm_srli_epi16::<V_S>(r0hw);
    let g0_lo16 = _mm_srli_epi16::<V_S>(g0lw);
    let g0_hi16 = _mm_srli_epi16::<V_S>(g0hw);
    let b0_lo16 = _mm_srli_epi16::<V_S>(b0lw);
    let b0_hi16 = _mm_srli_epi16::<V_S>(b0hw);

    let y_bias = _mm_set1_epi16(range.bias_y as i16 * (1 << A_E));
    let v_yr = _mm_set1_epi16(transform.yr as i16);
    let v_yg = _mm_set1_epi16(transform.yg as i16);
    let v_yb = _mm_set1_epi16(transform.yb as i16);

    let y0_l = _mm_srli_epi16::<A_E>(_mm_add_epi16(
        y_bias,
        _mm_add_epi16(
            _mm_add_epi16(
                _mm_mulhrs_epi16(r0_lo16, v_yr),
                _mm_mulhrs_epi16(g0_lo16, v_yg),
            ),
            _mm_mulhrs_epi16(b0_lo16, v_yb),
        ),
    ));

    let y0_h = _mm_srli_epi16::<A_E>(_mm_add_epi16(
        y_bias,
        _mm_add_epi16(
            _mm_add_epi16(
                _mm_mulhrs_epi16(r0_hi16, v_yr),
                _mm_mulhrs_epi16(g0_hi16, v_yg),
            ),
            _mm_mulhrs_epi16(b0_hi16, v_yb),
        ),
    ));

    let y0_yuv = _mm_packus_epi16(y0_l, y0_h);
    _mm_storeu_si128(y_dst0.as_mut_ptr() as *mut __m128i, y0_yuv);

    let (r_values1, g_values1, b_values1) =
        _mm_load_deinterleave_rgb_for_yuv::<ORIGIN_CHANNELS>(src1.as_ptr());

    let r1lw = _mm_unpacklo_epi8(r_values1, r_values1);
    let r1hw = _mm_unpackhi_epi8(r_values1, r_values1);
    let g1lw = _mm_unpacklo_epi8(g_values1, g_values1);
    let g1hw = _mm_unpackhi_epi8(g_values1, g_values1);
    let b1lw = _mm_unpacklo_epi8(b_values1, b_values1);
    let b1hw = _mm_unpackhi_epi8(b_values1, b_values1);

    let r1_lo = _mm_srli_epi16::<V_S>(r1lw);
    let r1_hi = _mm_srli_epi16::<V_S>(r1hw);
    let g1_lo = _mm_srli_epi16::<V_S>(g1lw);
    let g1_hi = _mm_srli_epi16::<V_S>(g1hw);
    let b1_lo = _mm_srli_epi16::<V_S>(b1lw);
    let b1_hi = _mm_srli_epi16::<V_S>(b1hw);

    let y1_l = _mm_srli_epi16::<A_E>(_mm_add_epi16(
        y_bias,
        _mm_add_epi16(
            _mm_add_epi16(_mm_mulhrs_epi16(r1_lo, v_yr), _mm_mulhrs_epi16(g1_lo, v_yg)),
            _mm_mulhrs_epi16(b1_lo, v_yb),
        ),
    ));

    let y1_h = _mm_srli_epi16::<A_E>(_mm_add_epi16(
        y_bias,
        _mm_add_epi16(
            _mm_add_epi16(_mm_mulhrs_epi16(r1_hi, v_yr), _mm_mulhrs_epi16(g1_hi, v_yg)),
            _mm_mulhrs_epi16(b1_hi, v_yb),
        ),
    ));

    let y1_yuv = _mm_packus_epi16(y1_l, y1_h);

    _mm_storeu_si128(y_dst1.as_mut_ptr() as *mut __m128i, y1_yuv);

    let r_avg = _mm_avg_epu8(r_values0, r_values1);
    let g_avg = _mm_avg_epu8(g_values0, g_values1);
    let b_avg = _mm_avg_epu8(b_values0, b_values1);

    let r1 = sse_pairwise_avg_epi8_j(r_avg, 1 << (16 - V_S - 8 - 1));
    let g1 = sse_pairwise_avg_epi8_j(g_avg, 1 << (16 - V_S - 8 - 1));
    let b1 = sse_pairwise_avg_epi8_j(b_avg, 1 << (16 - V_S - 8 - 1));

    let uv_bias = _mm_set1_epi16(range.bias_uv as i16 * (1 << A_E) + (1 << (A_E - 1)) - 1);
    let v_cb_r = _mm_set1_epi16(transform.cb_r as i16);
    let v_cb_g = _mm_set1_epi16(transform.cb_g as i16);
    let v_cb_b = _mm_set1_epi16(transform.cb_b as i16);
    let v_cr_r = _mm_set1_epi16(transform.cr_r as i16);
    let v_cr_g = _mm_set1_epi16(transform.cr_g as i16);
    let v_cr_b = _mm_set1_epi16(transform.cr_b as i16);

    let cbrc = _mm_mulhrs_epi16(r1, v_cb_r);
    let crrc = _mm_mulhrs_epi16(r1, v_cr_r);
    let cbgc = _mm_mulhrs_epi16(g1, v_cb_g);
    let crgc = _mm_mulhrs_epi16(g1, v_cr_g);
    let cbbc = _mm_mulhrs_epi16(b1, v_cb_b);
    let crbc = _mm_mulhrs_epi16(b1, v_cr_b);

    let cbo = _mm_add_epi16(cbrc, cbgc);
    let cro = _mm_add_epi16(crrc, crgc);

    let cbl = _mm_add_epi16(cbo, cbbc);
    let crl = _mm_add_epi16(cro, crbc);

    let cbk = _mm_srli_epi16::<A_E>(_mm_add_epi16(uv_bias, cbl));
    let crk = _mm_srli_epi16::<A_E>(_mm_add_epi16(uv_bias, crl));

    let cb = _mm_packus_epi16(cbk, cbk);
    let cr = _mm_packus_epi16(crk, crk);

    let row0 = match order {
        YuvNVOrder::UV => _mm_unpacklo_epi8(cb, cr),
        YuvNVOrder::VU => _mm_unpacklo_epi8(cr, cb),
    };
    _mm_storeu_si128(uv_dst.as_mut_ptr() as *mut __m128i, row0);
}

#[target_feature(enable = "sse4.1")]
unsafe fn sse_rgba_to_nv_row_impl420<
    const ORIGIN_CHANNELS: u8,
    const UV_ORDER: u8,
    const PRECISION: i32,
>(
    y_plane0: &mut [u8],
    y_plane1: &mut [u8],
    uv_plane: &mut [u8],
    rgba0: &[u8],
    rgba1: &[u8],
    width: u32,
    range: &YuvChromaRange,
    transform: &CbCrForwardTransform<i32>,
    start_cx: usize,
    start_ux: usize,
) -> ProcessedOffset {
    let source_channels: YuvSourceChannels = ORIGIN_CHANNELS.into();
    let channels = source_channels.get_channels_count();

    let mut cx = start_cx;
    let mut uv_x = start_ux;

    while cx + 16 < width as usize {
        let px = cx * channels;

        encode_16_part::<ORIGIN_CHANNELS, UV_ORDER, PRECISION>(
            rgba0.get_unchecked(px..),
            rgba1.get_unchecked(px..),
            y_plane0.get_unchecked_mut(cx..),
            y_plane1.get_unchecked_mut(cx..),
            uv_plane.get_unchecked_mut(uv_x..),
            range,
            transform,
        );

        uv_x += 16;
        cx += 16;
    }

    if cx < width as usize {
        let diff = width as usize - cx;
        assert!(diff <= 16);

        let mut src_buffer0: [MaybeUninit<u8>; 16 * 4] = [MaybeUninit::uninit(); 16 * 4];
        let mut src_buffer1: [MaybeUninit<u8>; 16 * 4] = [MaybeUninit::uninit(); 16 * 4];
        let mut y_buffer0: [MaybeUninit<u8>; 16] = [MaybeUninit::uninit(); 16];
        let mut y_buffer1: [MaybeUninit<u8>; 16] = [MaybeUninit::uninit(); 16];
        let mut uv_buffer: [MaybeUninit<u8>; 16 * 2] = [MaybeUninit::uninit(); 16 * 2];

        std::ptr::copy_nonoverlapping(
            rgba0.get_unchecked(cx * channels..).as_ptr(),
            src_buffer0.as_mut_ptr().cast(),
            diff * channels,
        );

        std::ptr::copy_nonoverlapping(
            rgba1.get_unchecked(cx * channels..).as_ptr(),
            src_buffer1.as_mut_ptr().cast(),
            diff * channels,
        );

        // Replicate last item to one more position for subsampling
        if diff % 2 != 0 {
            let lst = (width as usize - 1) * channels;
            let last_items0 = rgba0.get_unchecked(lst..(lst + channels));
            let last_items1 = rgba1.get_unchecked(lst..(lst + channels));
            let dvb = diff * channels;
            let dst0 = src_buffer0.get_unchecked_mut(dvb..(dvb + channels));
            let dst1 = src_buffer1.get_unchecked_mut(dvb..(dvb + channels));
            for (dst, src) in dst0.iter_mut().zip(last_items0) {
                *dst = MaybeUninit::new(*src);
            }
            for (dst, src) in dst1.iter_mut().zip(last_items1) {
                *dst = MaybeUninit::new(*src);
            }
        }

        encode_16_part::<ORIGIN_CHANNELS, UV_ORDER, PRECISION>(
            std::mem::transmute::<&[MaybeUninit<u8>], &[u8]>(src_buffer0.as_slice()),
            std::mem::transmute::<&[MaybeUninit<u8>], &[u8]>(src_buffer1.as_slice()),
            std::mem::transmute::<&mut [MaybeUninit<u8>], &mut [u8]>(y_buffer0.as_mut_slice()),
            std::mem::transmute::<&mut [MaybeUninit<u8>], &mut [u8]>(y_buffer1.as_mut_slice()),
            std::mem::transmute::<&mut [MaybeUninit<u8>], &mut [u8]>(uv_buffer.as_mut_slice()),
            range,
            transform,
        );

        std::ptr::copy_nonoverlapping(
            y_buffer0.as_ptr().cast(),
            y_plane0.get_unchecked_mut(cx..).as_mut_ptr(),
            diff,
        );

        std::ptr::copy_nonoverlapping(
            y_buffer1.as_ptr().cast(),
            y_plane1.get_unchecked_mut(cx..).as_mut_ptr(),
            diff,
        );

        let ux_size = diff.div_ceil(2) * 2;

        std::ptr::copy_nonoverlapping(
            uv_buffer.as_ptr().cast(),
            uv_plane.get_unchecked_mut(uv_x..).as_mut_ptr(),
            ux_size,
        );

        cx += diff;
        uv_x += ux_size;
    }

    ProcessedOffset { cx, ux: uv_x }
}