pic-scale 0.7.5

/*
 * Copyright (c) Radzivon Bartoshyk. 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::filter_weights::FilterWeights;
use crate::support::{PRECISION, ROUNDING_CONST};
#[cfg(target_arch = "x86")]
use std::arch::x86::*;
#[cfg(target_arch = "x86_64")]
use std::arch::x86_64::*;

#[inline]
fn conv_horiz_rgba_1_u16(start_x: usize, src: &[u16], w0: __m128i, store: __m128i) -> __m128i {
    unsafe {
        const CN: usize = 4;
        let src_ptr = src.get_unchecked((start_x * CN)..);
        let rgba_pixel = _mm_loadl_epi64(src_ptr.as_ptr() as *const __m128i);

        _mm_add_epi32(
            store,
            _mm_madd_epi16(_mm_unpacklo_epi16(rgba_pixel, _mm_setzero_si128()), w0),
        )
    }
}

#[inline]
fn conv_horiz_rgba_2_u16(
    start_x: usize,
    src: &[u16],
    w0: __m128i,
    w1: __m128i,
    store: __m128i,
) -> __m128i {
    unsafe {
        const CN: usize = 4;
        let src_ptr = src.get_unchecked((start_x * CN)..);

        let rgb_pixel = _mm_loadu_si128(src_ptr.as_ptr() as *const __m128i);

        let acc = _mm_add_epi32(
            store,
            _mm_madd_epi16(_mm_unpackhi_epi16(rgb_pixel, _mm_setzero_si128()), w1),
        );
        _mm_add_epi32(
            acc,
            _mm_madd_epi16(_mm_unpacklo_epi16(rgb_pixel, _mm_setzero_si128()), w0),
        )
    }
}

#[inline]
fn conv_horiz_rgba_4_u16(
    start_x: usize,
    src: &[u16],
    w0: __m128i,
    w1: __m128i,
    w2: __m128i,
    w3: __m128i,
    store: __m128i,
) -> __m128i {
    unsafe {
        const CN: usize = 4;
        let src_ptr = src.get_unchecked((start_x * CN)..);

        let rgba_pixel0 = _mm_loadu_si128(src_ptr.as_ptr() as *const __m128i);
        let rgba_pixel1 = _mm_loadu_si128(src_ptr.get_unchecked(8..).as_ptr() as *const __m128i);

        let zeros = _mm_setzero_si128();

        let acc = _mm_add_epi32(
            store,
            _mm_madd_epi16(_mm_unpackhi_epi16(rgba_pixel1, zeros), w3),
        );
        let acc = _mm_add_epi32(
            acc,
            _mm_madd_epi16(_mm_unpacklo_epi16(rgba_pixel1, zeros), w2),
        );
        let acc = _mm_add_epi32(
            acc,
            _mm_madd_epi16(_mm_unpackhi_epi16(rgba_pixel0, zeros), w1),
        );
        _mm_add_epi32(
            acc,
            _mm_madd_epi16(_mm_unpacklo_epi16(rgba_pixel0, zeros), w0),
        )
    }
}

#[inline(always)]
fn conv_horiz_rgba_8_u16(
    start_x: usize,
    src: &[u16],
    set1: (__m128i, __m128i, __m128i, __m128i),
    set2: (__m128i, __m128i, __m128i, __m128i),
    store: __m128i,
) -> __m128i {
    unsafe {
        const CN: usize = 4;
        let src_ptr = src.get_unchecked((start_x * CN)..);

        let zeros = _mm_setzero_si128();

        let rgba_pixel0 = _mm_loadu_si128(src_ptr.as_ptr() as *const __m128i);
        let rgba_pixel1 = _mm_loadu_si128(src_ptr.get_unchecked(8..).as_ptr() as *const __m128i);
        let rgba_pixel2 = _mm_loadu_si128(src_ptr.get_unchecked(16..).as_ptr() as *const __m128i);
        let rgba_pixel3 = _mm_loadu_si128(src_ptr.get_unchecked(24..).as_ptr() as *const __m128i);

        let mut acc = _mm_add_epi32(
            store,
            _mm_madd_epi16(_mm_unpackhi_epi16(rgba_pixel1, zeros), set1.3),
        );
        acc = _mm_add_epi32(
            acc,
            _mm_madd_epi16(_mm_unpacklo_epi16(rgba_pixel1, zeros), set1.2),
        );
        acc = _mm_add_epi32(
            acc,
            _mm_madd_epi16(_mm_unpackhi_epi16(rgba_pixel0, zeros), set1.1),
        );
        acc = _mm_add_epi32(
            acc,
            _mm_madd_epi16(_mm_unpacklo_epi16(rgba_pixel0, zeros), set1.0),
        );

        acc = _mm_add_epi32(
            acc,
            _mm_madd_epi16(_mm_unpackhi_epi16(rgba_pixel3, zeros), set2.3),
        );
        acc = _mm_add_epi32(
            acc,
            _mm_madd_epi16(_mm_unpacklo_epi16(rgba_pixel3, zeros), set2.2),
        );
        acc = _mm_add_epi32(
            acc,
            _mm_madd_epi16(_mm_unpackhi_epi16(rgba_pixel2, zeros), set2.1),
        );
        acc = _mm_add_epi32(
            acc,
            _mm_madd_epi16(_mm_unpacklo_epi16(rgba_pixel2, zeros), set2.0),
        );
        acc
    }
}

pub(crate) fn convolve_horizontal_rgba_sse_rows_4_lb_u16(
    src: &[u16],
    src_stride: usize,
    dst: &mut [u16],
    dst_stride: usize,
    filter_weights: &FilterWeights<i16>,
    bit_depth: u32,
) {
    unsafe {
        convolve_horizontal_rgba_sse_rows_4_lb_u16_impl(
            src,
            src_stride,
            dst,
            dst_stride,
            filter_weights,
            bit_depth,
        );
    }
}

#[target_feature(enable = "sse4.1")]
fn convolve_horizontal_rgba_sse_rows_4_lb_u16_impl(
    src: &[u16],
    src_stride: usize,
    dst: &mut [u16],
    dst_stride: usize,
    filter_weights: &FilterWeights<i16>,
    bit_depth: u32,
) {
    unsafe {
        assert!((1..=16).contains(&bit_depth));
        const CN: usize = 4;
        let init = _mm_set1_epi32(ROUNDING_CONST);

        let v_max_colors = _mm_set1_epi16((1 << bit_depth) - 1);

        let (row0_ref, rest) = dst.split_at_mut(dst_stride);
        let (row1_ref, rest) = rest.split_at_mut(dst_stride);
        let (row2_ref, row3_ref) = rest.split_at_mut(dst_stride);

        let iter_row0 = row0_ref.as_chunks_mut::<CN>().0.iter_mut();
        let iter_row1 = row1_ref.as_chunks_mut::<CN>().0.iter_mut();
        let iter_row2 = row2_ref.as_chunks_mut::<CN>().0.iter_mut();
        let iter_row3 = row3_ref.as_chunks_mut::<CN>().0.iter_mut();

        for (((((chunk0, chunk1), chunk2), chunk3), &bounds), weights) in iter_row0
            .zip(iter_row1)
            .zip(iter_row2)
            .zip(iter_row3)
            .zip(filter_weights.bounds.iter())
            .zip(
                filter_weights
                    .weights
                    .chunks_exact(filter_weights.aligned_size),
            )
        {
            let mut jx = 0usize;
            let mut store_0 = init;
            let mut store_1 = init;
            let mut store_2 = init;
            let mut store_3 = init;

            let bounds_size = bounds.size;

            let src0 = src;
            let src1 = src0.get_unchecked(src_stride..);
            let src2 = src1.get_unchecked(src_stride..);
            let src3 = src2.get_unchecked(src_stride..);

            #[cfg(target_arch = "x86_64")]
            while jx + 8 <= bounds_size {
                let bounds_start = bounds.start + jx;
                let w_ptr = weights.get_unchecked(jx..(jx + 8));
                let w0 = _mm_set1_epi16(w_ptr[0]);
                let w1 = _mm_set1_epi16(w_ptr[1]);
                let w2 = _mm_set1_epi16(w_ptr[2]);
                let w3 = _mm_set1_epi16(w_ptr[3]);
                let w4 = _mm_set1_epi16(w_ptr[4]);
                let w5 = _mm_set1_epi16(w_ptr[5]);
                let w6 = _mm_set1_epi16(w_ptr[6]);
                let w7 = _mm_set1_epi16(w_ptr[7]);
                let set1 = (w0, w1, w2, w3);
                let set2 = (w4, w5, w6, w7);
                store_0 = conv_horiz_rgba_8_u16(bounds_start, src0, set1, set2, store_0);
                store_1 = conv_horiz_rgba_8_u16(bounds_start, src1, set1, set2, store_1);
                store_2 = conv_horiz_rgba_8_u16(bounds_start, src2, set1, set2, store_2);
                store_3 = conv_horiz_rgba_8_u16(bounds_start, src3, set1, set2, store_3);
                jx += 8;
            }

            while jx + 4 <= bounds_size {
                let bounds_start = bounds.start + jx;
                let w_ptr = weights.get_unchecked(jx..(jx + 4));
                let w0 = _mm_set1_epi16(w_ptr[0]);
                let w1 = _mm_set1_epi16(w_ptr[1]);
                let w2 = _mm_set1_epi16(w_ptr[2]);
                let w3 = _mm_set1_epi16(w_ptr[3]);
                store_0 = conv_horiz_rgba_4_u16(bounds_start, src0, w0, w1, w2, w3, store_0);
                store_1 = conv_horiz_rgba_4_u16(bounds_start, src1, w0, w1, w2, w3, store_1);
                store_2 = conv_horiz_rgba_4_u16(bounds_start, src2, w0, w1, w2, w3, store_2);
                store_3 = conv_horiz_rgba_4_u16(bounds_start, src3, w0, w1, w2, w3, store_3);
                jx += 4;
            }

            while jx + 2 <= bounds_size {
                let w_ptr = weights.get_unchecked(jx..(jx + 2));
                let bounds_start = bounds.start + jx;
                let w0 = _mm_set1_epi16(w_ptr[0]);
                let w1 = _mm_set1_epi16(w_ptr[1]);
                store_0 = conv_horiz_rgba_2_u16(bounds_start, src0, w0, w1, store_0);
                store_1 = conv_horiz_rgba_2_u16(bounds_start, src1, w0, w1, store_1);
                store_2 = conv_horiz_rgba_2_u16(bounds_start, src2, w0, w1, store_2);
                store_3 = conv_horiz_rgba_2_u16(bounds_start, src3, w0, w1, store_3);
                jx += 2;
            }

            while jx < bounds_size {
                let w_ptr = weights.get_unchecked(jx..(jx + 1));
                let bounds_start = bounds.start + jx;
                let w0 = _mm_set1_epi16(w_ptr[0]);
                store_0 = conv_horiz_rgba_1_u16(bounds_start, src0, w0, store_0);
                store_1 = conv_horiz_rgba_1_u16(bounds_start, src1, w0, store_1);
                store_2 = conv_horiz_rgba_1_u16(bounds_start, src2, w0, store_2);
                store_3 = conv_horiz_rgba_1_u16(bounds_start, src3, w0, store_3);
                jx += 1;
            }

            let v_st0 = _mm_srai_epi32::<PRECISION>(store_0);
            let v_st1 = _mm_srai_epi32::<PRECISION>(store_1);
            let v_st2 = _mm_srai_epi32::<PRECISION>(store_2);
            let v_st3 = _mm_srai_epi32::<PRECISION>(store_3);

            let store_16_0 = _mm_min_epi16(_mm_packus_epi32(v_st0, v_st0), v_max_colors);
            let store_16_1 = _mm_min_epi16(_mm_packus_epi32(v_st1, v_st1), v_max_colors);
            let store_16_2 = _mm_min_epi16(_mm_packus_epi32(v_st2, v_st2), v_max_colors);
            let store_16_3 = _mm_min_epi16(_mm_packus_epi32(v_st3, v_st3), v_max_colors);

            _mm_storeu_si64(chunk0.as_mut_ptr() as *mut u8, store_16_0);
            _mm_storeu_si64(chunk1.as_mut_ptr() as *mut u8, store_16_1);
            _mm_storeu_si64(chunk2.as_mut_ptr() as *mut u8, store_16_2);
            _mm_storeu_si64(chunk3.as_mut_ptr() as *mut u8, store_16_3);
        }
    }
}

pub(crate) fn convolve_horizontal_rgba_sse_u16_lb_row(
    src: &[u16],
    dst: &mut [u16],
    filter_weights: &FilterWeights<i16>,
    bit_depth: u32,
) {
    unsafe {
        convolve_horizontal_rgba_sse_u16_lb_row_impl(src, dst, filter_weights, bit_depth);
    }
}

#[target_feature(enable = "sse4.1")]
fn convolve_horizontal_rgba_sse_u16_lb_row_impl(
    src: &[u16],
    dst: &mut [u16],
    filter_weights: &FilterWeights<i16>,
    bit_depth: u32,
) {
    unsafe {
        const CN: usize = 4;

        let v_max_colors = _mm_set1_epi16((1 << bit_depth) - 1);

        for ((dst, bounds), weights) in dst
            .as_chunks_mut::<CN>()
            .0
            .iter_mut()
            .zip(filter_weights.bounds.iter())
            .zip(
                filter_weights
                    .weights
                    .chunks_exact(filter_weights.aligned_size),
            )
        {
            let bounds_size = bounds.size;
            let mut jx = 0usize;
            let mut store = _mm_set1_epi32(ROUNDING_CONST);

            while jx + 8 <= bounds_size {
                let bounds_start = bounds.start + jx;
                let w_ptr = weights.get_unchecked(jx..(jx + 8));
                let w0 = _mm_set1_epi16(w_ptr[0]);
                let w1 = _mm_set1_epi16(w_ptr[1]);
                let w2 = _mm_set1_epi16(w_ptr[2]);
                let w3 = _mm_set1_epi16(w_ptr[3]);
                let w4 = _mm_set1_epi16(w_ptr[4]);
                let w5 = _mm_set1_epi16(w_ptr[5]);
                let w6 = _mm_set1_epi16(w_ptr[6]);
                let w7 = _mm_set1_epi16(w_ptr[7]);
                let set1 = (w0, w1, w2, w3);
                let set2 = (w4, w5, w6, w7);
                store = conv_horiz_rgba_8_u16(bounds_start, src, set1, set2, store);
                jx += 8;
            }

            while jx + 4 <= bounds_size {
                let w_ptr = weights.get_unchecked(jx..(jx + 4));
                let w0 = _mm_set1_epi16(w_ptr[0]);
                let w1 = _mm_set1_epi16(w_ptr[1]);
                let w2 = _mm_set1_epi16(w_ptr[2]);
                let w3 = _mm_set1_epi16(w_ptr[3]);
                let bounds_start = bounds.start + jx;
                store = conv_horiz_rgba_4_u16(bounds_start, src, w0, w1, w2, w3, store);
                jx += 4;
            }

            while jx + 2 <= bounds_size {
                let w_ptr = weights.get_unchecked(jx..(jx + 2));
                let bounds_start = bounds.start + jx;
                let w0 = _mm_set1_epi16(w_ptr[0]);
                let w1 = _mm_set1_epi16(w_ptr[1]);
                store = conv_horiz_rgba_2_u16(bounds_start, src, w0, w1, store);
                jx += 2;
            }

            while jx < bounds_size {
                let w_ptr = weights.get_unchecked(jx..(jx + 1));
                let w0 = _mm_set1_epi16(w_ptr[0]);
                let bounds_start = bounds.start + jx;
                store = conv_horiz_rgba_1_u16(bounds_start, src, w0, store);
                jx += 1;
            }

            let v_st = _mm_srai_epi32::<PRECISION>(store);

            let store_16_0 = _mm_min_epi16(_mm_packus_epi32(v_st, v_st), v_max_colors);
            _mm_storeu_si64(dst.as_mut_ptr() as *mut u8, store_16_0);
        }
    }
}