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do 270 degree rot out of place

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bendn 2023-10-03 13:55:26 +07:00
parent f863d295d6
commit 248bba7bb9
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GPG key ID: 0D9D3A2A3B2A93D6
2 changed files with 27 additions and 15 deletions
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4
benches/affine_transformations.rs
View file

@ -28,8 +28,8 @@ bench!(fn flip_h() { run flip_h() } flip_hc);
bench!(fn flip_v() { run flip_v() } flip_vc);
bench!(fn rotate_90() { run rot_90() } rot_90c);
bench!(fn rotate_180() { run rot_180() } rot_180c);
bench!(fn rotate_270() { run rot_270() } rot_280c);
bench!(fn rotate_270() { run rot_270() } rot_270c);
iai::main!(
flip_h, flip_v, rotate_90, rotate_180, rotate_270, flip_hc, flip_vc, rot_90c, rot_180c,
rot_280c
rot_270c
);

38
src/affine.rs
View file

@ -107,16 +107,8 @@ impl<const CHANNELS: usize> ImageCloner<'_, CHANNELS> {
/// UB if the image is not square
#[must_use = "function does not modify the original image"]
pub unsafe fn rot_90(&self) -> Image<Vec<u8>, CHANNELS> {
let mut out = self.alloc();
// SAFETY: yep
unsafe {
mattr::transpose(
self.flatten(),
out.flatten_mut(),
self.height() as usize,
self.width() as usize,
)
};
let mut out = unsafe { transpose_out(self) };
// SAFETY: sqar
unsafe { crev(out.as_mut()) };
out
@ -128,9 +120,9 @@ impl<const CHANNELS: usize> ImageCloner<'_, CHANNELS> {
/// UB if the image is not square
#[must_use = "function does not modify the original image"]
pub unsafe fn rot_270(&self) -> Image<Vec<u8>, CHANNELS> {
let mut out = self.flip_h();
// SAFETY: sqar
unsafe { transpose(&mut out.as_mut()) };
// SAFETY: yep
let mut out = unsafe { transpose_out(self) };
out.flip_v();
out
}
}
@ -178,7 +170,7 @@ unsafe fn crev<const CHANNELS: usize, T: DerefMut<Target = [u8]>>(mut img: Image
let mut start = 0;
let mut end = size - 1;
while start < end {
// SAFETY: hmm
// SAFETY: hmm
unsafe { b.swap_unchecked(i * size + start, i * size + end) };
start += 1;
end -= 1;
@ -186,6 +178,26 @@ unsafe fn crev<const CHANNELS: usize, T: DerefMut<Target = [u8]>>(mut img: Image
}
}
/// Transpose a square image out of place
/// # Safety
///
/// UB if provided image rectangular
unsafe fn transpose_out<const CHANNELS: usize>(
i: &ImageCloner<'_, CHANNELS>,
) -> Image<Vec<u8>, CHANNELS> {
let mut out = i.alloc();
// SAFETY: yep
unsafe {
mattr::transpose(
i.flatten(),
out.flatten_mut(),
i.height() as usize,
i.width() as usize,
)
};
out
}
/// Transpose a square image
/// # Safety
///