yuv 0.8.12

High performance utilities for YUV format handling and conversion.
Documentation 
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/*
 * 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_affine_uv_dot, _mm_interleave_epi16, _mm_load_deinterleave_rgb_for_yuv,
    sse_pairwise_avg_epi8_j,
};
use crate::yuv_support::{CbCrForwardTransform, YuvChromaRange, YuvSourceChannels};
#[cfg(target_arch = "x86")]
use std::arch::x86::*;
#[cfg(target_arch = "x86_64")]
use std::arch::x86_64::*;
use std::mem::MaybeUninit;

/// This is special path for 2 rows of BiPlanar 4:2:0 to reuse variables instead of computing them
pub(crate) fn sse_rgba_to_yuv420_prof<const ORIGIN_CHANNELS: u8, const PRECISION: i32>(
    transform: &CbCrForwardTransform<i32>,
    range: &YuvChromaRange,
    y_plane0: &mut [u8],
    y_plane1: &mut [u8],
    u_plane: &mut [u8],
    v_plane: &mut [u8],
    rgba0: &[u8],
    rgba1: &[u8],
    start_cx: usize,
    start_ux: usize,
    width: usize,
) -> ProcessedOffset {
    unsafe {
        sse_rgba_to_yuv420_prof_impl::<ORIGIN_CHANNELS, PRECISION>(
            transform, range, y_plane0, y_plane1, u_plane, v_plane, rgba0, rgba1, start_cx,
            start_ux, width,
        )
    }
}

#[inline(always)]
unsafe fn encode_16_part<const ORIGIN_CHANNELS: u8, const PRECISION: i32>(
    src0: &[u8],
    src1: &[u8],
    y_dst0: &mut [u8],
    y_dst1: &mut [u8],
    u_dst: &mut [u8],
    v_dst: &mut [u8],
    range: &YuvChromaRange,
    transform: &CbCrForwardTransform<i32>,
) {
    let rounding_const_y = (1 << (PRECISION - 1)) - 1;
    let y_bias = _mm_set1_epi32(range.bias_y as i32 * (1 << PRECISION) + rounding_const_y);
    let v_yr_yg = _mm_set1_epi32(transform._interleaved_yr_yg());
    let v_yb = _mm_set1_epi32(transform.yb);

    let precision_uv = PRECISION + 1;
    let rounding_const_uv = (1 << (precision_uv - 1)) - 1;

    let uv_bias = _mm_set1_epi32(range.bias_uv as i32 * (1 << precision_uv) + rounding_const_uv);
    let v_cb_r_g = _mm_set1_epi32(transform._interleaved_cbr_cbg());
    let v_cb_b = _mm_set1_epi32(transform.cb_b);
    let v_cr_r_g = _mm_set1_epi32(transform._interleaved_crr_crg());
    let v_cr_b = _mm_set1_epi32(transform.cr_b);

    let (r_values0, g_values0, b_values0) =
        _mm_load_deinterleave_rgb_for_yuv::<ORIGIN_CHANNELS>(src0.as_ptr());
    let (r_values1, g_values1, b_values1) =
        _mm_load_deinterleave_rgb_for_yuv::<ORIGIN_CHANNELS>(src1.as_ptr());

    let rl0 = _mm_unpacklo_epi8(r_values0, _mm_setzero_si128());
    let gl0 = _mm_unpacklo_epi8(g_values0, _mm_setzero_si128());
    let bl0 = _mm_unpacklo_epi8(b_values0, _mm_setzero_si128());

    let (rl_gl0, rl_gl1) = _mm_interleave_epi16(rl0, gl0);
    let (b_lo0, b_lo1) = _mm_interleave_epi16(bl0, _mm_setzero_si128());

    let y00_vl =
        _mm_affine_uv_dot::<PRECISION>(y_bias, rl_gl0, rl_gl1, b_lo0, b_lo1, v_yr_yg, v_yb);

    let rh0 = _mm_unpackhi_epi8(r_values0, _mm_setzero_si128());
    let gh0 = _mm_unpackhi_epi8(g_values0, _mm_setzero_si128());
    let bh0 = _mm_unpackhi_epi8(b_values0, _mm_setzero_si128());

    let (rl_gh0, rl_gh1) = _mm_interleave_epi16(rh0, gh0);
    let (b_h0, b_h1) = _mm_interleave_epi16(bh0, _mm_setzero_si128());

    let y01_vl = _mm_affine_uv_dot::<PRECISION>(y_bias, rl_gh0, rl_gh1, b_h0, b_h1, v_yr_yg, v_yb);

    let y0_values = _mm_packus_epi16(y00_vl, y01_vl);
    _mm_storeu_si128(y_dst0.as_mut_ptr() as *mut _, y0_values);

    let rl1 = _mm_unpacklo_epi8(r_values1, _mm_setzero_si128());
    let gl1 = _mm_unpacklo_epi8(g_values1, _mm_setzero_si128());
    let bl1 = _mm_unpacklo_epi8(b_values1, _mm_setzero_si128());

    let (rl_gl01, rl_gl11) = _mm_interleave_epi16(rl1, gl1);
    let (b_lo10, b_lo11) = _mm_interleave_epi16(bl1, _mm_setzero_si128());

    let y10_vl =
        _mm_affine_uv_dot::<PRECISION>(y_bias, rl_gl01, rl_gl11, b_lo10, b_lo11, v_yr_yg, v_yb);

    let rh1 = _mm_unpackhi_epi8(r_values1, _mm_setzero_si128());
    let gh1 = _mm_unpackhi_epi8(g_values1, _mm_setzero_si128());
    let bh1 = _mm_unpackhi_epi8(b_values1, _mm_setzero_si128());

    let (rl_gh11, rl_gh110) = _mm_interleave_epi16(rh1, gh1);
    let (b_h11, b_h111) = _mm_interleave_epi16(bh1, _mm_setzero_si128());

    let y11_vl =
        _mm_affine_uv_dot::<PRECISION>(y_bias, rl_gh11, rl_gh110, b_h11, b_h111, v_yr_yg, v_yb);

    let y0_values = _mm_packus_epi16(y10_vl, y11_vl);
    _mm_storeu_si128(y_dst1.as_mut_ptr() as *mut _, y0_values);

    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);
    let g1 = sse_pairwise_avg_epi8_j(g_avg, 1);
    let b1 = sse_pairwise_avg_epi8_j(b_avg, 1);

    let (rhv0, rhv1) = _mm_interleave_epi16(r1, g1);
    let (bhv0, bhv1) = _mm_interleave_epi16(b1, _mm_setzero_si128());

    let cb_s = _mm_affine_uv_dot::<16>(uv_bias, rhv0, rhv1, bhv0, bhv1, v_cb_r_g, v_cb_b);
    let cr_s = _mm_affine_uv_dot::<16>(uv_bias, rhv0, rhv1, bhv0, bhv1, v_cr_r_g, v_cr_b);

    let cb = _mm_packus_epi16(cb_s, cb_s);
    let cr = _mm_packus_epi16(cr_s, cr_s);

    _mm_storeu_si64(u_dst.as_mut_ptr() as *mut _, cb);
    _mm_storeu_si64(v_dst.as_mut_ptr() as *mut _, cr);
}

#[target_feature(enable = "sse4.1")]
unsafe fn sse_rgba_to_yuv420_prof_impl<const ORIGIN_CHANNELS: u8, const PRECISION: i32>(
    transform: &CbCrForwardTransform<i32>,
    range: &YuvChromaRange,
    y_plane0: &mut [u8],
    y_plane1: &mut [u8],
    u_plane: &mut [u8],
    v_plane: &mut [u8],
    rgba0: &[u8],
    rgba1: &[u8],
    start_cx: usize,
    start_ux: usize,
    width: 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 {
        let px = cx * channels;

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

        uv_x += 8;
        cx += 16;
    }

    if cx < width {
        let diff = width - 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 u_buffer: [MaybeUninit<u8>; 16] = [MaybeUninit::uninit(); 16];
        let mut v_buffer: [MaybeUninit<u8>; 16] = [MaybeUninit::uninit(); 16];

        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 - 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, 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]>(u_buffer.as_mut_slice()),
            std::mem::transmute::<&mut [MaybeUninit<u8>], &mut [u8]>(v_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);

        std::ptr::copy_nonoverlapping(
            u_buffer.as_ptr().cast(),
            u_plane.get_unchecked_mut(uv_x..).as_mut_ptr(),
            ux_size,
        );
        std::ptr::copy_nonoverlapping(
            v_buffer.as_ptr().cast(),
            v_plane.get_unchecked_mut(uv_x..).as_mut_ptr(),
            ux_size,
        );

        cx += diff;
        uv_x += ux_size;
    }

    ProcessedOffset { cx, ux: uv_x }
}