rgb/formats/
gray_alpha.rs

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1use crate::formats::gray_a::GrayA;
2use core::ops::Deref;
3
4#[repr(C)]
5#[cfg_attr(feature = "unstable-experimental", deprecated(note = "renamed to GrayA"))]
6#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
7#[cfg_attr(feature = "defmt-03", derive(defmt::Format))]
8#[derive(Copy, Clone, Debug, Default, Eq, PartialEq, Ord, PartialOrd, Hash)]
9/// A pixel for grayscale value + alpha components (rgb crate v0.8)
10///
11/// Through a `Deref` hack it renames the fields from `.0` and `.1`
12/// to `.v` (value) and `.a` (alpha)
13#[allow(non_camel_case_types)]
14pub struct GrayAlpha_v08<T, A = T>(
15    /// Grayscale Component
16    ///
17    /// This field has been renamed to `.v`
18    pub T,
19    /// Alpha Component. This field has been renamed to `.a`.
20    pub A,
21);
22
23impl<T: Copy> GrayAlpha_v08<T> {
24    /// Reads the `.0` field
25    ///
26    /// This function isn't necessary, but it is forwards-compatible with the next major version of the RGB crate.
27    pub fn value(self) -> T {
28        self.0
29    }
30
31    /// Exposes the `.0` field for writing
32    ///
33    /// This function isn't necessary, but it is forwards-compatible with the next major version of the RGB crate.
34    pub fn value_mut(&mut self) -> &mut T {
35        &mut self.0
36    }
37}
38
39impl<T, A> Deref for GrayAlpha_v08<T, A> {
40    type Target = GrayA<T, A>;
41
42    /// A trick that allows using `.v` and `.a` on the old `GrayAlpha` type.
43    fn deref(&self) -> &GrayA<T, A> {
44        unsafe {
45            &*(self as *const Self as *const GrayA::<T, A>)
46        }
47    }
48}
49
50#[test]
51fn swizzle() {
52    let g = GrayAlpha_v08(10u8, 20u8);
53    assert_eq!(10, g.v);
54    assert_eq!(20, g.a);
55}
rgb/formats/gray_alpha.rs

rgb/formats/
gray_alpha.rs
