zenbitmaps 0.1.5

PNM/PAM/PFM, BMP, farbfeld, QOI, TGA, and Radiance HDR image codec
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40

//! Sealed traits mapping `rgb` crate pixel types to [`PixelLayout`].

use crate::PixelLayout;

mod private {
    pub trait Sealed {}
}

/// Pixel type that can be decoded from PNM/BMP data.
pub trait DecodePixel: Copy + 'static + private::Sealed {
    /// The [`PixelLayout`] this pixel type corresponds to.
    fn layout() -> PixelLayout;
}

/// Pixel type that can be encoded to PNM/BMP data.
pub trait EncodePixel: Copy + 'static + private::Sealed {
    /// The [`PixelLayout`] this pixel type corresponds to.
    fn layout() -> PixelLayout;
}

macro_rules! impl_pixel {
    ($ty:ty, $layout:expr) => {
        impl private::Sealed for $ty {}
        impl DecodePixel for $ty {
            fn layout() -> PixelLayout {
                $layout
            }
        }
        impl EncodePixel for $ty {
            fn layout() -> PixelLayout {
                $layout
            }
        }
    };
}

impl_pixel!(rgb::RGB<u8>, PixelLayout::Rgb8);
impl_pixel!(rgb::RGBA<u8>, PixelLayout::Rgba8);
impl_pixel!(rgb::alt::BGR<u8>, PixelLayout::Bgr8);
impl_pixel!(rgb::alt::BGRA<u8>, PixelLayout::Bgra8);