bendns' repos / fimg
fast image operations
Diffstat (limited to 'src/scale/traits.rs')
-rw-r--r--src/scale/traits.rs98
1 files changed, 0 insertions, 98 deletions
diff --git a/src/scale/traits.rs b/src/scale/traits.rs
deleted file mode 100644
index 647f3bd..0000000
--- a/src/scale/traits.rs
+++ /dev/null
@@ -1,98 +0,0 @@
-//! implementation detail for scaling. look into if you want to add a algorithm
-use std::num::NonZeroU32;
-
-#[doc(hidden)]
-mod seal {
- #[doc(hidden)]
- pub trait Sealed {}
-}
-
-use seal::Sealed;
-
-use crate::Image;
-impl Sealed for ChannelCount<1> {}
-impl Sealed for ChannelCount<2> {}
-impl Sealed for ChannelCount<3> {}
-impl Sealed for ChannelCount<4> {}
-
-/// How to scale a image
-pub trait ScalingAlgorithm {
- /// Y/Rgb scale
- fn scale_opaque<const N: usize>(
- i: Image<&[u8], N>,
- w: NonZeroU32,
- h: NonZeroU32,
- ) -> Image<Box<[u8]>, N>
- where
- ChannelCount<N>: ToImageView<N>;
- /// Ya/Rgba scale
- fn scale_transparent<const N: usize>(
- i: Image<&mut [u8], N>,
- w: NonZeroU32,
- h: NonZeroU32,
- ) -> Image<Box<[u8]>, N>
- where
- ChannelCount<N>: AlphaDiv<N>;
-}
-
-/// helper
-pub trait ToImageView<const N: usize>: Sealed {
- #[doc(hidden)]
- type P: fr::PixelExt + fr::Convolution;
- #[doc(hidden)]
- fn wrap(i: Image<&[u8], N>) -> fr::ImageView<'_, Self::P>;
-}
-
-/// helper
-pub trait AlphaDiv<const N: usize>: Sealed + ToImageView<N> {
- #[doc(hidden)]
- type P: fr::PixelExt + fr::Convolution + fr::AlphaMulDiv;
- #[doc(hidden)]
- fn handle(i: Image<&mut [u8], N>) -> fr::Image<'_, <Self as AlphaDiv<N>>::P>;
- #[doc(hidden)]
- fn unhandle(i: &mut fr::Image<<Self as AlphaDiv<N>>::P>);
-}
-
-/// Generic helper for [`Image`] and [`fr::Image`] transfers.
-pub struct ChannelCount<const N: usize> {}
-
-macro_rules! tiv {
- ($n:literal, $which:ident) => {
- impl ToImageView<$n> for ChannelCount<$n> {
- type P = fr::$which;
- fn wrap(i: Image<&[u8], $n>) -> fr::ImageView<'_, Self::P> {
- // SAFETY: same conds
- unsafe { fr::ImageView::new(i.width, i.height, i.buffer()) }
- }
- }
- };
-}
-
-tiv!(1, U8);
-tiv!(2, U8x2);
-tiv!(3, U8x3);
-tiv!(4, U8x4);
-
-macro_rules! adiv {
- ($n:literal, $which:ident) => {
- impl AlphaDiv<$n> for ChannelCount<$n> {
- type P = fr::$which;
- fn handle(i: Image<&mut [u8], $n>) -> fr::Image<'_, <Self as AlphaDiv<$n>>::P> {
- // SAFETY: we kinda have the same conditions
- let mut i = unsafe { fr::Image::from_slice_u8(i.width, i.height, i.take_buffer()) };
- // SAFETY: mhm
- unsafe { fr::MulDiv::default().multiply_alpha_inplace(&mut i.view_mut()) };
-
- i
- }
-
- fn unhandle(i: &mut fr::Image<<Self as AlphaDiv<$n>>::P>) {
- // SAFETY: mhm
- unsafe { fr::MulDiv::default().divide_alpha_inplace(&mut i.view_mut()) }
- }
- }
- };
-}
-
-adiv!(2, U8x2);
-adiv!(4, U8x4);