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/*
* Copyright (c) Radzivon Bartoshyk. 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.
*/
use std::arch::aarch64::*;
/// Checks if image has constant alpha by xor rows
pub(crate) fn neon_has_non_constant_cap_alpha_rgba8(
store: &[u8],
width: usize,
stride: usize,
) -> bool {
unsafe {
if store.is_empty() {
return true;
}
let first_alpha = store[3];
let v_first_alpha = vdupq_n_u8(first_alpha);
for row in store.chunks(stride) {
let row = &row[..width * 4];
let mut sums = vdupq_n_u32(0);
for chunk in row.chunks_exact(16 * 4) {
let loaded = vld4q_u8(chunk.as_ptr());
let blend_result = veorq_u8(loaded.3, v_first_alpha);
let blend32 = vpaddlq_u16(vpaddlq_u8(blend_result));
sums = vaddq_u32(sums, blend32);
}
let row = row.chunks_exact(16 * 4).remainder();
for chunk in row.chunks_exact(8 * 4) {
let loaded = vld4_u8(chunk.as_ptr());
let blend_result = veor_u8(loaded.3, vget_low_u8(v_first_alpha));
let blend32 = vpaddl_u16(vpaddl_u8(blend_result));
sums = vaddq_u32(sums, vcombine_u32(blend32, blend32));
}
let row = row.chunks_exact(8 * 4).remainder();
let mut h_sum = vaddvq_u32(sums);
for chunk in row.chunks_exact(4) {
h_sum += chunk[3] as u32 ^ first_alpha as u32;
}
if h_sum != 0 {
return true;
}
}
false
}
}
/// Checks if image has constant alpha by xor rows for image 16bits
pub(crate) fn neon_has_non_constant_cap_alpha_rgba16(
store: &[u16],
width: usize,
stride: usize,
) -> bool {
unsafe {
if store.is_empty() {
return true;
}
let first_alpha = store[3];
let def_alpha = vdupq_n_u16(first_alpha);
for row in store.chunks(stride) {
let row = &row[..width * 4];
let mut sums = vdupq_n_u32(0);
for chunk in row.chunks_exact(8 * 4) {
let r0 = vld4q_u16(chunk.as_ptr());
let pxor = veorq_u16(r0.3, def_alpha);
sums = vaddq_u32(sums, vpaddlq_u16(pxor));
}
let row = row.chunks_exact(8 * 4).remainder();
for chunk in row.chunks_exact(4 * 4) {
let r0 = vld4_u16(chunk.as_ptr());
let pxor = veor_u16(r0.3, vget_low_u16(def_alpha));
let pw = vpaddl_u16(pxor);
sums = vaddq_u32(sums, vcombine_u32(pw, pw));
}
let row = row.chunks_exact(4 * 4).remainder();
let mut h_sum = vaddvq_u32(sums);
for chunk in row.chunks_exact(4) {
h_sum += chunk[3] as u32 ^ first_alpha as u32;
}
if h_sum != 0 {
return true;
}
}
false
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn check_alpha_exists_rgba8() {
let image_size = 256usize;
let mut image = vec![0u8; image_size * image_size * 4];
image[3 + 150 * 4] = 75;
let has_alpha = neon_has_non_constant_cap_alpha_rgba8(&image, image_size, image_size * 4);
assert_eq!(true, has_alpha);
}
#[test]
fn check_alpha_not_exists_rgba8() {
let image_size = 256usize;
let image = vec![255u8; image_size * image_size * 4];
let has_alpha = neon_has_non_constant_cap_alpha_rgba8(&image, image_size, image_size * 4);
assert_eq!(false, has_alpha);
}
#[test]
fn check_alpha_not_exists_rgba16() {
let image_size = 256usize;
let image = vec![255u16; image_size * image_size * 4];
let has_alpha = neon_has_non_constant_cap_alpha_rgba16(&image, image_size, image_size * 4);
assert_eq!(false, has_alpha);
}
#[test]
fn check_alpha_exists_rgba16() {
let image_size = 256usize;
let mut image = vec![0u16; image_size * image_size * 4];
image[3] = 715;
image[7] = 715;
image[11] = 715;
image[15] = 715;
let has_alpha = neon_has_non_constant_cap_alpha_rgba16(&image, image_size, image_size * 4);
assert_eq!(true, has_alpha);
}
}