zoomvtools 1.1.1

Video motion vector analysis utilities in pure Rust
Documentation 
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#![allow(clippy::undocumented_unsafe_blocks)]
#![allow(unsafe_op_in_unsafe_fn)]

#[cfg(any(test, feature = "experimental"))]
use std::{arch::x86_64::*, mem::size_of, num::NonZeroUsize};

#[cfg(any(test, feature = "experimental"))]
use semisafe::result::unwrap as semisafe_res_unwrap;

#[target_feature(enable = "avx2")]
#[cfg(any(test, feature = "experimental"))]
// NOTE: Ported from C implementation
pub(super) unsafe fn limit_changes_u8(
    dest: *mut u8,
    dest_stride_bytes: NonZeroUsize,
    src: *const u8,
    src_stride_bytes: NonZeroUsize,
    width: NonZeroUsize,
    height: NonZeroUsize,
    limit: u16,
) {
    let width = width.get();
    let height = height.get();
    let dest_stride = dest_stride_bytes.get();
    let src_stride = src_stride_bytes.get();
    let limit = semisafe_res_unwrap(u8::try_from(limit));

    let limit256 = _mm256_set1_epi8(i8::from_ne_bytes([limit]));
    let limit128 = _mm_set1_epi8(i8::from_ne_bytes([limit]));

    for y in 0..height {
        let src_row = src.add(y * src_stride);
        let dest_row = dest.add(y * dest_stride);
        let mut x = 0;

        while x + 32 <= width {
            let src256 = _mm256_loadu_si256(src_row.add(x).cast::<__m256i>());
            let dest256 = _mm256_loadu_si256(dest_row.add(x).cast::<__m256i>());

            let lower = _mm256_subs_epu8(src256, limit256);
            let upper = _mm256_adds_epu8(src256, limit256);
            let clamped = _mm256_min_epu8(_mm256_max_epu8(dest256, lower), upper);

            _mm256_storeu_si256(dest_row.add(x).cast::<__m256i>(), clamped);
            x += 32;
        }

        if x + 16 <= width {
            let src128 = _mm_loadu_si128(src_row.add(x).cast::<__m128i>());
            let dest128 = _mm_loadu_si128(dest_row.add(x).cast::<__m128i>());

            let lower = _mm_subs_epu8(src128, limit128);
            let upper = _mm_adds_epu8(src128, limit128);
            let clamped = _mm_min_epu8(_mm_max_epu8(dest128, lower), upper);

            _mm_storeu_si128(dest_row.add(x).cast::<__m128i>(), clamped);
            x += 16;
        }

        while x < width {
            let src = *src_row.add(x);
            let dest = *dest_row.add(x);
            let lower = src.saturating_sub(limit);
            let upper = src.saturating_add(limit);
            *dest_row.add(x) = lower.max(dest).min(upper);
            x += 1;
        }
    }
}

#[target_feature(enable = "avx2")]
#[cfg(any(test, feature = "experimental"))]
// NOTE: Custom implementation. No C implementation exists.
pub(super) unsafe fn limit_changes_u16(
    dest: *mut u8,
    dest_stride_bytes: NonZeroUsize,
    src: *const u8,
    src_stride_bytes: NonZeroUsize,
    width: NonZeroUsize,
    height: NonZeroUsize,
    limit: u16,
) {
    let width = width.get();
    let height = height.get();
    let dest_stride = dest_stride_bytes.get() / size_of::<u16>();
    let src_stride = src_stride_bytes.get() / size_of::<u16>();
    let src = src.cast::<u16>();
    let dest = dest.cast::<u16>();

    let limit256 = _mm256_set1_epi16(i16::from_ne_bytes(limit.to_ne_bytes()));
    let limit128 = _mm_set1_epi16(i16::from_ne_bytes(limit.to_ne_bytes()));

    for y in 0..height {
        let src_row = src.add(y * src_stride);
        let dest_row = dest.add(y * dest_stride);
        let mut x = 0;

        while x + 16 <= width {
            let src256 = _mm256_loadu_si256(src_row.add(x).cast::<__m256i>());
            let dest256 = _mm256_loadu_si256(dest_row.add(x).cast::<__m256i>());

            let lower = _mm256_subs_epu16(src256, limit256);
            let upper = _mm256_adds_epu16(src256, limit256);
            let clamped = _mm256_min_epu16(_mm256_max_epu16(dest256, lower), upper);

            _mm256_storeu_si256(dest_row.add(x).cast::<__m256i>(), clamped);
            x += 16;
        }

        if x + 8 <= width {
            let src128 = _mm_loadu_si128(src_row.add(x).cast::<__m128i>());
            let dest128 = _mm_loadu_si128(dest_row.add(x).cast::<__m128i>());

            let lower = _mm_subs_epu16(src128, limit128);
            let upper = _mm_adds_epu16(src128, limit128);
            let clamped = _mm_min_epu16(_mm_max_epu16(dest128, lower), upper);

            _mm_storeu_si128(dest_row.add(x).cast::<__m128i>(), clamped);
            x += 8;
        }

        while x < width {
            let src = *src_row.add(x);
            let dest = *dest_row.add(x);
            let lower = src.saturating_sub(limit);
            let upper = src.saturating_add(limit);
            *dest_row.add(x) = lower.max(dest).min(upper);
            x += 1;
        }
    }
}