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use std::cell::UnsafeCell;
use rayon::prelude::*;
use crate::core::traits::{GenericImageView, Pixel, TryConvert, TryConvertSlice};
use crate::packed::generic::{ImageView, ImageViewMut, ImageBuffer};
struct UnsafeShared<T: ?Sized> {
value: UnsafeCell<T>,
}
impl<T> UnsafeShared<T> {
pub fn new(t: T) -> UnsafeShared<T> {
UnsafeShared {
value: UnsafeCell::new(t),
}
}
#[allow(clippy::mut_from_ref)]
pub fn get(&self) -> &mut T {
unsafe { &mut *self.value.get() }
}
}
unsafe impl<T: ?Sized + Send> Send for UnsafeShared<T> {}
unsafe impl<T: ?Sized + Send> Sync for UnsafeShared<T> {}
macro_rules! impl_TryConvert {
() => {
type Error = ();
fn try_convert(&self, output: &mut ImageBuffer<DP>) -> Result<(), Self::Error> {
if output.width() < self.width() || output.height() < self.height() {
*output = ImageBuffer::new(self.width(), self.height());
}
let output = UnsafeShared::new(output);
(0..self.height()).into_par_iter().for_each(|i| {
let output = output.get();
let row_in = &self[i as usize];
let row_out = &mut output[i as usize];
SP::try_convert(row_in, row_out).unwrap();
});
Ok(())
}
};
}
macro_rules! impl_TryConvertFlat {
() => {
type Error = ();
fn try_convert(&self, output: &mut ImageViewMut<'b, DP>) -> Result<(), Self::Error> {
if output.width() < self.width() || output.height() < self.height() {
return Err(());
}
let output = UnsafeShared::new(output);
(0..self.height()).into_par_iter().for_each(|i| {
let output = output.get();
let row_in = &self[i as usize];
let row_out = &mut output[i as usize];
SP::try_convert(row_in, row_out).unwrap();
});
Ok(())
}
};
}
impl<'a, SP, DP> TryConvert<ImageBuffer<DP>> for ImageView<'a, SP>
where
SP: Pixel,
DP: Pixel,
SP: TryConvertSlice<DP>,
{
impl_TryConvert!();
}
impl<'a, SP, DP> TryConvert<ImageBuffer<DP>> for ImageViewMut<'a, SP>
where
SP: Pixel,
DP: Pixel,
SP: TryConvertSlice<DP>,
{
impl_TryConvert!();
}
impl<SP, DP> TryConvert<ImageBuffer<DP>> for ImageBuffer<SP>
where
SP: Pixel,
DP: Pixel,
SP: TryConvertSlice<DP>,
{
impl_TryConvert!();
}
impl<'a, 'b, SP, DP> TryConvert<ImageViewMut<'b, DP>> for ImageView<'a, SP>
where
SP: Pixel,
DP: Pixel,
SP: TryConvertSlice<DP>,
{
impl_TryConvertFlat!();
}
impl<'a, 'b, SP, DP> TryConvert<ImageViewMut<'b, DP>> for ImageViewMut<'a, SP>
where
SP: Pixel,
DP: Pixel,
SP: TryConvertSlice<DP>,
{
impl_TryConvertFlat!();
}
impl<'b, SP, DP> TryConvert<ImageViewMut<'b, DP>> for ImageBuffer<SP>
where
SP: Pixel,
DP: Pixel,
SP: TryConvertSlice<DP>,
{
impl_TryConvertFlat!();
}