futureproof transmutation issues

src/lib.rs

@@ -86,7 +86,7 @@
     confusable_idents,
     internal_features
 )]
-use std::{hint::assert_unchecked, num::NonZeroU32, ops::Range};
+use std::{hint::assert_unchecked, intrinsics::transmute_unchecked, num::NonZeroU32, ops::Range};
 
 mod affine;
 #[cfg(feature = "blur")]
@@ -448,6 +448,18 @@ impl<T, const CHANNELS: usize> Image<T, CHANNELS> {
         self.buffer().as_ref().len()
     }
 
+    /// Transforms the N
+    ///
+    /// # Safety
+    ///
+    /// i think you can see why this is a problem.
+    ///
+    /// # WHY???
+    ///
+    /// sometimes rust is silly with generics
+    unsafe fn trans<const N: usize>(self) -> Image<T, N> {
+        unsafe { transmute_unchecked(self) }
+    }
     /// # Safety
     ///
     /// the output index is not guaranteed to be in bounds

src/term/bloc.rs

@@ -50,16 +50,17 @@ where
             let (w, h) = fit((self.width(), self.height()));
             macro_rules! n {
                 ($n:literal) => {
-                    transmute::<Image<Box<[u8]>, $n>, Image<Box<[u8]>, N>>(
+                    self.as_ref()
-                        transmute::<Image<&[u8], N>, Image<&[u8], $n>>(self.as_ref())
+                        .trans::<$n>()
-                            .scale::<scale::Nearest>(w, h),
+                        .scale::<scale::Nearest>(w, h)
-                    )
+                        .trans::<N>()
                 };
                 (o $n:literal) => {
-                    transmute::<Image<Box<[u8]>, 1>, Image<Box<[u8]>, N>>(
+                    self.as_ref()
-                        transmute::<Image<Vec<u8>, N>, Image<Vec<u8>, 1>>(self.as_ref().to_owned())
+                        .to_owned()
-                            .scale::<scale::Nearest>(w, h),
+                        .trans::<1>()
-                    )
+                        .scale::<scale::Nearest>(w, h)
+                        .trans::<N>()
                 };
             }
             // SAFETY: #[allow(clippy::undocumented_unsafe_blocks)]

src/term/iterm2.rs

@@ -42,7 +42,7 @@ where
             ($n:literal) => {
                 WritePng::write(
                     // SAFETY: ... i renounce traits
-                    &unsafe { transmute::<Image<&[u8], N>, Image<&[u8], $n>>(self.as_ref()) },
+                    &unsafe { self.as_ref().trans::<$n>() },
                     &mut d,
                 )
                 .unwrap()

src/term/kitty.rs

@@ -45,7 +45,7 @@ impl<T: AsRef<[u8]>, const N: usize> Kitty<T, N> {
                     Cow::Owned(
                         <Image<Box<[u8]>, 3>>::from({
                             // SAFETY: ...
-                            unsafe { transmute::<Image<&[u8], N>, Image<&[u8], $n>>(self.as_ref()) }
+                            unsafe { self.as_ref().trans::<$n>() }
                         })
                         .take_buffer()
                         .to_vec(),