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Bilinear YUV upsampling
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| /* | |
| * Copyright (c) Radzivon Bartoshyk, 6/2025. 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. | |
| */ | |
| #[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)) - 1; | |
| let max_value: i32 = (1 << BIT_DEPTH) - 1; | |
| ((val + rounding) >> PRECISION).min(max_value).max(0) | |
| } | |
| // Q_FRACTION and Q fixed point format should match to work correctly; | |
| const Y_BIAS: i16 = 0; | |
| const UV_BIAS: i16 = 0; | |
| const Y_COEF: i16 = 0; | |
| const CR_COEF: i16 = 0; | |
| const CB_COEF: i16 = 0; | |
| const G_COEF_1: i16 = 0; | |
| const G_COEF_2: i16 = 0; | |
| fn interpolate_1_row<const CN: usize, const Q_FRACTION: i32>( | |
| y_plane: &[u8], | |
| u_plane: &[u8], | |
| v_plane: &[u8], | |
| rgba: &mut [u8], | |
| ) { | |
| const BIT_DEPTH: usize = 8; | |
| // Bilinear upscaling weights in Q0.4 | |
| // x = x0 * 0.75 + x1 * 0.25 = (x0 * 3 + x1 + 1) >> 2 | |
| for (((rgba, y_src), u_src), v_src) in rgba | |
| .chunks_exact_mut(CN * 2) | |
| .zip(y_plane.chunks_exact(2)) | |
| .zip(u_plane.windows(2)) | |
| .zip(v_plane.windows(2)) | |
| { | |
| let cb_0 = (u_src[0] as u16 * 3 + u_src[1] as u16 + 2) >> 2; | |
| let cr_0 = (v_src[0] as u16 * 3 + v_src[1] as u16 + 2) >> 2; | |
| let cb_1 = (u_src[0] as u16 + u_src[1] as u16 * 3 + 2) >> 2; | |
| let cr_1 = (v_src[0] as u16 + v_src[1] as u16 * 3 + 2) >> 2; | |
| let y_value0 = (y_src[0] as i32 - Y_BIAS as i32) * Y_COEF as i32; | |
| let cb_value0 = cb_0 as i16 - UV_BIAS; | |
| let cr_value0 = cr_0 as i16 - UV_BIAS; | |
| let r0 = qrshr::<Q_FRACTION, BIT_DEPTH>(y_value0 + CR_COEF as i32 * cr_value0 as i32); | |
| let b0 = qrshr::<Q_FRACTION, BIT_DEPTH>(y_value0 + CB_COEF as i32 * cb_value0 as i32); | |
| let g0 = qrshr::<Q_FRACTION, BIT_DEPTH>( | |
| y_value0 - G_COEF_1 as i32 * cr_value0 as i32 - G_COEF_2 as i32 * cb_value0 as i32, | |
| ); | |
| let rgba0 = &mut rgba[..CN]; | |
| rgba0[0] = r0 as u8; | |
| rgba0[1] = g0 as u8; | |
| rgba0[2] = b0 as u8; | |
| if CN == 4 { | |
| rgba0[3] = 255u8; | |
| } | |
| let y_value1 = (y_src[1] as i32 - Y_BIAS as i32) * Y_COEF as i32; | |
| let cb_value1 = cb_1 as i16 - UV_BIAS; | |
| let cr_value1 = cr_1 as i16 - UV_BIAS; | |
| let r0 = qrshr::<Q_FRACTION, BIT_DEPTH>(y_value1 + CR_COEF as i32 * cr_value1 as i32); | |
| let b0 = qrshr::<Q_FRACTION, BIT_DEPTH>(y_value1 + CB_COEF as i32 * cb_value1 as i32); | |
| let g0 = qrshr::<Q_FRACTION, BIT_DEPTH>( | |
| y_value1 - G_COEF_1 as i32 * cr_value1 as i32 - G_COEF_2 as i32 * cb_value1 as i32, | |
| ); | |
| let rgba1 = &mut rgba[CN..CN * 2]; | |
| rgba1[0] = r0 as u8; | |
| rgba1[1] = g0 as u8; | |
| rgba1[2] = b0 as u8; | |
| if CN == 4 { | |
| rgba1[3] = 255u8; | |
| } | |
| } | |
| let y_chunks = y_plane.chunks_exact(2); | |
| let y_remainder = y_chunks.remainder(); | |
| let rgba_chunks = rgba.chunks_exact_mut(CN * 2); | |
| let rgba_remainder = rgba_chunks.into_remainder(); | |
| if let ([last_y], [rgba @ ..]) = (y_remainder, rgba_remainder) { | |
| let y_value0 = (*last_y as i32 - Y_BIAS as i32) * Y_COEF as i32; | |
| let cb_value = *u_plane.last().unwrap() as i32 - UV_BIAS as i32; | |
| let cr_value = *v_plane.last().unwrap() as i32 - UV_BIAS as i32; | |
| let rgba0 = &mut rgba[..CN]; | |
| let r0 = qrshr::<Q_FRACTION, BIT_DEPTH>(y_value0 + CR_COEF as i32 * cr_value); | |
| let b0 = qrshr::<Q_FRACTION, BIT_DEPTH>(y_value0 + CB_COEF as i32 * cb_value); | |
| let g0 = qrshr::<Q_FRACTION, BIT_DEPTH>( | |
| y_value0 - G_COEF_1 as i32 * cr_value - G_COEF_2 as i32 * cb_value, | |
| ); | |
| rgba0[0] = r0 as u8; | |
| rgba0[1] = g0 as u8; | |
| rgba0[2] = b0 as u8; | |
| if CN == 4 { | |
| rgba0[3] = 255; | |
| } | |
| } | |
| } | |
| fn interpolate_2_rows<const CN: usize, const Q_FRACTION: i32>( | |
| y_plane: &[u8], | |
| u_plane0: &[u8], | |
| u_plane1: &[u8], | |
| v_plane0: &[u8], | |
| v_plane1: &[u8], | |
| rgba: &mut [u8], | |
| ) { | |
| const BIT_DEPTH: usize = 8; | |
| // Bilinear upscaling weights in Q0.4 | |
| // x = x0y0 * 0.5625 + x1y0 * 0.1875 + x0y1 * 0.1875 * x1y1 * 0.0625 = (x0y0 * 9 + x1y0 * 3 + x0y1 * 3 + x1y1 + (1 << 3)) >> 4 | |
| for (((((rgba0, y_src0), u_src), u_src_next), v_src), v_src_next) in rgba | |
| .chunks_exact_mut(CN * 2) | |
| .zip(y_plane.chunks_exact(2)) | |
| .zip(u_plane0.windows(2)) | |
| .zip(u_plane1.windows(2)) | |
| .zip(v_plane0.windows(2)) | |
| .zip(v_plane1.windows(2)) | |
| { | |
| let cb_0 = (u_src[0] as u16 * 9 | |
| + u_src[1] as u16 * 3 | |
| + u_src_next[0] as u16 * 3 | |
| + u_src_next[1] as u16 | |
| + (1 << 3)) | |
| >> 4; | |
| let cr_0 = (v_src[0] as u16 * 9 | |
| + v_src[1] as u16 * 3 | |
| + v_src_next[0] as u16 * 3 | |
| + v_src_next[1] as u16 | |
| + (1 << 3)) | |
| >> 4; | |
| let cb_1 = (u_src[0] as u16 * 3 | |
| + u_src[1] as u16 * 9 | |
| + u_src_next[0] as u16 | |
| + u_src_next[1] as u16 * 3 | |
| + (1 << 3)) | |
| >> 4; | |
| let cr_1 = (v_src[0] as u16 * 3 | |
| + v_src[1] as u16 * 9 | |
| + v_src_next[0] as u16 | |
| + v_src_next[1] as u16 * 3 | |
| + (1 << 3)) | |
| >> 4; | |
| let y_value0 = (y_src0[0] as i32 - Y_BIAS as i32) * Y_COEF as i32; | |
| let cb_value0 = cb_0 as i16 - UV_BIAS; | |
| let cr_value0 = cr_0 as i16 - UV_BIAS; | |
| let g_built_coeff0 = | |
| -G_COEF_1 as i32 * cr_value0 as i32 - G_COEF_2 as i32 * cb_value0 as i32; | |
| let r0 = qrshr::<Q_FRACTION, BIT_DEPTH>(y_value0 + CR_COEF as i32 * cr_value0 as i32); | |
| let b0 = qrshr::<Q_FRACTION, BIT_DEPTH>(y_value0 + CB_COEF as i32 * cb_value0 as i32); | |
| let g0 = qrshr::<Q_FRACTION, BIT_DEPTH>(y_value0 + g_built_coeff0); | |
| let rgba00 = &mut rgba0[..CN]; | |
| rgba00[0] = r0 as u8; | |
| rgba00[1] = g0 as u8; | |
| rgba00[2] = b0 as u8; | |
| if CN == 4 { | |
| rgba00[3] = 255u8; | |
| } | |
| let y_value1 = (y_src0[1] as i32 - Y_BIAS as i32) * Y_COEF as i32; | |
| let cb_value1 = cb_1 as i16 - UV_BIAS; | |
| let cr_value1 = cr_1 as i16 - UV_BIAS; | |
| let g_built_coeff1 = | |
| -G_COEF_1 as i32 * cr_value1 as i32 - G_COEF_2 as i32 * cb_value1 as i32; | |
| let r1 = qrshr::<Q_FRACTION, BIT_DEPTH>(y_value1 + CR_COEF as i32 * cr_value1 as i32); | |
| let b1 = qrshr::<Q_FRACTION, BIT_DEPTH>(y_value1 + CB_COEF as i32 * cb_value1 as i32); | |
| let g1 = qrshr::<Q_FRACTION, BIT_DEPTH>(y_value1 + g_built_coeff1); | |
| let rgba01 = &mut rgba0[CN..CN * 2]; | |
| rgba01[0] = r1 as u8; | |
| rgba01[1] = g1 as u8; | |
| rgba01[2] = b1 as u8; | |
| if CN == 4 { | |
| rgba01[3] = 255u8; | |
| } | |
| } | |
| let y_chunks = y_plane.chunks_exact(2); | |
| let y_remainder = y_chunks.remainder(); | |
| let rgba_chunks = rgba.chunks_exact_mut(CN * 2); | |
| let rgba_remainder = rgba_chunks.into_remainder(); | |
| if let ([last_y], [rgba @ ..]) = (y_remainder, rgba_remainder) { | |
| let y_value0 = (*last_y as i32 - Y_BIAS as i32) * Y_COEF as i32; | |
| let cb_0 = (*u_plane0.last().unwrap() as u16 * 12 | |
| + *u_plane1.last().unwrap() as u16 * 4 | |
| + (1 << 3)) | |
| >> 4; | |
| let cr_0 = (*v_plane0.last().unwrap() as u16 * 12 | |
| + (*v_plane1.last().unwrap()) as u16 * 4 | |
| + (1 << 3)) | |
| >> 4; | |
| let cb_value = cb_0 as i16 - UV_BIAS; | |
| let cr_value = cr_0 as i16 - UV_BIAS; | |
| let rgba0 = &mut rgba[..CN]; | |
| let g_built_coeff = -G_COEF_1 * cr_value - G_COEF_2 * cb_value; | |
| let r0 = qrshr::<Q_FRACTION, BIT_DEPTH>(y_value0 + CR_COEF as i32 * cr_value as i32); | |
| let b0 = qrshr::<Q_FRACTION, BIT_DEPTH>(y_value0 + CB_COEF as i32 * cb_value as i32); | |
| let g0 = qrshr::<Q_FRACTION, BIT_DEPTH>(y_value0 + g_built_coeff as i32); | |
| rgba0[0] = r0 as u8; | |
| rgba0[1] = g0 as u8; | |
| rgba0[2] = b0 as u8; | |
| if CN == 4 { | |
| rgba0[3] = 255; | |
| } | |
| } | |
| } | |
| #[derive(Copy, Clone, Debug, Ord, PartialOrd, Eq, PartialEq)] | |
| enum Sampling { | |
| S420, | |
| S422, | |
| } | |
| fn yuv_to_rgbx_impl_bilinear< | |
| const CN: usize, // CHANNELS count 3 or 4 | |
| const Q_FRACTION: i32, | |
| >( | |
| y_plane: &[u8], | |
| y_stride: usize, | |
| u_plane: &[u8], | |
| u_stride: usize, | |
| v_plane: &[u8], | |
| v_stride: usize, | |
| rgba: &mut [u8], | |
| rgba_stride: u32, | |
| width: usize, | |
| height: usize, | |
| sampling: Sampling, | |
| ) { | |
| if sampling == Sampling::S422 { | |
| let iter = rgba | |
| .chunks_exact_mut(rgba_stride as usize) | |
| .zip(y_plane.chunks_exact(y_stride)) | |
| .zip(u_plane.chunks_exact(u_stride)) | |
| .zip(v_plane.chunks_exact(v_stride)); | |
| iter.for_each(|(((rgba, y_plane), u_plane), v_plane)| { | |
| interpolate_1_row::<CN, Q_FRACTION>( | |
| &y_plane[..width], | |
| &u_plane[..width.div_ceil(2)], | |
| &v_plane[..width.div_ceil(2)], | |
| &mut rgba[..width * CN], | |
| ); | |
| }); | |
| } else if sampling == Sampling::S420 { | |
| let iter = rgba | |
| .chunks_exact_mut(rgba_stride as usize * 2) | |
| .zip(y_plane.chunks_exact(y_stride * 2)) | |
| .zip(u_plane.windows(u_stride * 2).step_by(u_stride)) | |
| .zip(v_plane.windows(v_stride * 2).step_by(v_stride)); | |
| iter.for_each(|(((rgba, y_plane), u_plane), v_plane)| { | |
| let (y_plane0, y_plane1) = y_plane.split_at(y_stride); | |
| let (rgba0, rgba1) = rgba.split_at_mut(rgba_stride as usize); | |
| let (u_plane0, u_plane1) = u_plane.split_at(u_stride); | |
| let (v_plane0, v_plane1) = v_plane.split_at(v_stride); | |
| interpolate_2_rows::<CN, Q_FRACTION>( | |
| &y_plane0[..width], | |
| &u_plane0[..width.div_ceil(2)], | |
| &u_plane1[..width.div_ceil(2)], | |
| &v_plane0[..width.div_ceil(2)], | |
| &v_plane1[..width.div_ceil(2)], | |
| &mut rgba0[..width * CN], | |
| ); | |
| interpolate_2_rows::<CN, Q_FRACTION>( | |
| &y_plane1[..width], | |
| &u_plane1[..width.div_ceil(2)], | |
| &u_plane0[..width.div_ceil(2)], | |
| &v_plane1[..width.div_ceil(2)], | |
| &v_plane0[..width.div_ceil(2)], | |
| &mut rgba1[..width * CN], | |
| ); | |
| }); | |
| if height & 1 != 0 { | |
| let rgba = rgba.chunks_exact_mut(rgba_stride as usize).last().unwrap(); | |
| let u_plane = u_plane.chunks_exact(u_stride).last().unwrap(); | |
| let v_plane = v_plane.chunks_exact(v_stride).last().unwrap(); | |
| let y_plane = y_plane.chunks_exact(y_stride).last().unwrap(); | |
| interpolate_1_row::<CN, Q_FRACTION>( | |
| &y_plane[..width], | |
| &u_plane[..width.div_ceil(2)], | |
| &v_plane[..width.div_ceil(2)], | |
| &mut rgba[..width * CN], | |
| ); | |
| } | |
| } else { | |
| unreachable!(); | |
| } | |
| } |
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