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/*
* Copyright (c) Radzivon Bartoshyk, 11/2024. 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.
*/
#![forbid(unsafe_code)]
use crate::{YuvBytesPacking, YuvEndianness};
use std::ops::Shr;
#[inline(always)]
/// Saturating rounding shift right against bit depth
pub(crate) fn qrshr<const PRECISION: i32, const BIT_DEPTH: usize>(val: i32) -> i32 {
let rounding: i32 = 1 << (PRECISION - 1);
let max_value: i32 = (1 << BIT_DEPTH) - 1;
((val + rounding) >> PRECISION).min(max_value).max(0)
}
#[inline]
/// Integer division by 255 with rounding to nearest
pub(crate) fn div_by_255(v: u16) -> u8 {
((((v + 0x80) >> 8) + v + 0x80) >> 8) as u8
}
#[inline(always)]
/// Converts to MSB, if needed, and also to big endian
pub(crate) fn to_ne<const ENDIANNESS: u8, const BYTES_POSITION: u8>(v: u16, msb: i32) -> u16 {
let endianness: YuvEndianness = ENDIANNESS.into();
let bytes_position: YuvBytesPacking = BYTES_POSITION.into();
let new_v = match endianness {
#[cfg(feature = "big_endian")]
YuvEndianness::BigEndian => u16::from_be(v),
YuvEndianness::LittleEndian => u16::from_le(v),
};
match bytes_position {
YuvBytesPacking::MostSignificantBytes => new_v.shr(msb),
YuvBytesPacking::LeastSignificantBytes => new_v,
}
}
#[inline(always)]
/// Saturating rounding shift right against bit depth
pub(crate) fn qrshr_n<const PRECISION: i32>(val: i32, max: i32) -> i32 {
let rounding: i32 = 1 << (PRECISION - 1);
((val + rounding) >> PRECISION).min(max).max(0)
}