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use super::{get_hint_do_parallel, lift, unlift}; use crate::config::Config; use crate::processing::{ process_maybe_parallel_for_each, DoubleOverlappingChunks, DoubleOverlappingChunksIterator, }; #[inline(always)] pub fn lift_cubic(mut image: &mut [&mut [i16]]) { lift( &mut image, Config::multithreading_factors().cubic_horizontal_lifting, horizontal_lift, vertical_lift, ); } #[inline(always)] pub fn unlift_cubic(mut image: &mut [&mut [i16]]) { unlift( &mut image, Config::multithreading_factors().cubic_horizontal_lifting, horizontal_unlift, vertical_unlift, ); } #[inline(always)] unsafe fn horizontal_lifting_base( column: &mut [i16], step: usize, c0_column_start: usize, c2_step_multiplier: usize, step_start_multiplier: usize, divider: i32, ) { let mut c0 = *column.get_unchecked(c0_column_start); let mut c1 = c0; let mut c2 = if c2_step_multiplier * step < column.len() { *column.get_unchecked(c2_step_multiplier * step) } else { c0 }; let mut x = step_start_multiplier * step; if column.len() > 3 * step { while x < column.len() - 3 * step { let c3 = *column.get_unchecked(3 * step + x); *column.get_unchecked_mut(x) += (cubic(c0, c1, c2, c3) / divider) as i16; c0 = c1; c1 = c2; c2 = c3; x += step * 2; } } while x < column.len() { *column.get_unchecked_mut(x) += (cubic(c0, c1, c2, c2) / divider) as i16; c0 = c1; c1 = c2; x += step * 2; } } #[inline(always)] unsafe fn vertical_lifting_base( chunks: &mut DoubleOverlappingChunks<'_, &mut [i16]>, step: usize, divider: i32, ) { let mut x = 0; while x < chunks.middle.get_unchecked(0).len() { let c1 = *chunks.left.get_unchecked(0).get_unchecked(x); let c2 = if let Some(right_value) = chunks.right.first() { *right_value.get_unchecked(x) } else { c1 }; let c0 = if let Some(prev_left_value) = chunks.prev_left.first() { *prev_left_value.get_unchecked(x) } else { c1 }; let c3 = if let Some(next_right_value) = chunks.next_right.first() { *next_right_value.get_unchecked(x) } else { c2 }; *chunks.middle.get_unchecked_mut(0).get_unchecked_mut(x) += (cubic(c0, c1, c2, c3) / divider) as i16; x += step; } } #[inline(always)] unsafe fn horizontal_lift(mut column: &mut [i16], step: usize) { horizontal_lifting_base(&mut column, step, 0, 2, 1, -1); horizontal_lifting_base(&mut column, step, step, 3, 2, 2); } #[inline(always)] unsafe fn horizontal_unlift(mut column: &mut [i16], step: usize) { horizontal_lifting_base(&mut column, step, step, 3, 2, -2); horizontal_lifting_base(&mut column, step, 0, 2, 1, 1); } #[inline(always)] unsafe fn vertical_lift(mut image: &mut [&mut [i16]], step: usize) { let config_factor = Config::multithreading_factors().cubic_vertical_lifting; let hint_do_parallel = get_hint_do_parallel(&image, config_factor); process_maybe_parallel_for_each( DoubleOverlappingChunksIterator::from_slice(&mut image, step), |mut chunks| { vertical_lifting_base(&mut chunks, step, -1); }, hint_do_parallel, ); process_maybe_parallel_for_each( DoubleOverlappingChunksIterator::from_slice(&mut image[step..], step), |mut chunks| { vertical_lifting_base(&mut chunks, step, 2); }, hint_do_parallel, ); } #[inline(always)] unsafe fn vertical_unlift(mut image: &mut [&mut [i16]], step: usize) { let config_factor = Config::multithreading_factors().cubic_vertical_lifting; let hint_do_parallel = get_hint_do_parallel(&image, config_factor); process_maybe_parallel_for_each( DoubleOverlappingChunksIterator::from_slice(&mut image[step..], step), |mut chunks| { vertical_lifting_base(&mut chunks, step, -2); }, hint_do_parallel, ); process_maybe_parallel_for_each( DoubleOverlappingChunksIterator::from_slice(&mut image, step), |mut chunks| { vertical_lifting_base(&mut chunks, step, 1); }, hint_do_parallel, ); } fn median(mut a: i32, mut b: i32, mut c: i32) -> i32 { use std::mem; if a > b { mem::swap(&mut a, &mut b); } if b > c { mem::swap(&mut b, &mut c); } if a > b { mem::swap(&mut a, &mut b); } b } fn round_fraction(num: i32, denom: i32) -> i32 { if num < 0 { (num - denom / 2) / denom } else { (num + denom / 2) / denom } } pub fn cubic(c0: i16, c1: i16, c2: i16, c3: i16) -> i32 { let c0 = i32::from(c0); let c1 = i32::from(c1); let c2 = i32::from(c2); let c3 = i32::from(c3); let num = -c0 + 9 * (c1 + c2) - c3; median(round_fraction(num, 16), c1, c2) }