Revision control
Copy as Markdown
Other Tools
// Copyright (c) the JPEG XL Project Authors. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#![allow(clippy::type_complexity)]
#![allow(clippy::erasing_op)]
#![allow(clippy::identity_op)]
use jxl_simd::{F32SimdVec, SimdDescriptor};
#[allow(clippy::too_many_arguments)]
#[allow(clippy::excessive_precision)]
#[inline(always)]
pub(super) fn reinterpreting_dct_2<D: SimdDescriptor>(
d: D,
v0: D::F32Vec,
v1: D::F32Vec,
) -> (D::F32Vec, D::F32Vec) {
let v2 = v0 + v1;
let v3 = v0 - v1;
(
v2 * D::F32Vec::splat(d, 0.500000),
v3 * D::F32Vec::splat(d, 0.554469),
)
}
#[inline(always)]
pub(super) fn do_reinterpreting_dct_2<D: SimdDescriptor>(
d: D,
data: &mut [<D::F32Vec as F32SimdVec>::UnderlyingArray],
stride: usize,
) {
assert!(data.len() > 1 * stride);
let mut v0 = D::F32Vec::load_array(d, &data[0 * stride]);
let mut v1 = D::F32Vec::load_array(d, &data[1 * stride]);
(v0, v1) = reinterpreting_dct_2(d, v0, v1);
v0.store_array(&mut data[0 * stride]);
v1.store_array(&mut data[1 * stride]);
}