GenericImage::copy_from can't be used with RGB, only with RGBa

[libbkmz]

I'm trying to create DynamicImage from FlatSamples, which I got from another library.

use image::GenericImage;

fn main() {
    let w = 640;
    let h = 480;
    let bits_per_pixel = 3;

    let buffer = image::FlatSamples {
        samples: vec![],
        layout: image::flat::SampleLayout::row_major_packed(bits_per_pixel, w, h),
        color_hint: None,
    };

    let view = buffer.as_view::<image::Rgb<u8>>().unwrap();

    let mut dyn_img = image::DynamicImage::new_rgb8(w, h);
    let _ = dyn_img.copy_from(&view, 0, 0);
}

Playground link

This is the compilation error output:

error[[E0271]](https://doc.rust-lang.org/stable/error_codes/E0271.html): type mismatch resolving `<View<&[u8], Rgb<u8>> as GenericImageView>::Pixel == Rgba<u8>`
    --> src/main.rs:17:31
     |
17   |     let _ = dyn_img.copy_from(&view, 0, 0);
     |                     --------- ^^^^^ expected `Rgba<u8>`, found `Rgb<u8>`
     |                     |
     |                     required by a bound introduced by this call
     |
     = note: expected struct `Rgba<u8>`
                found struct `Rgb<u8>`

How can I create DynamicImage without an Alpha channel?

[fintelia]

Construct an RgbImage and then make the DynamicImage from that:

let mut img = image::RgbImage::new(w, h);
img.copy_from(&view, 0, 0).unwrap();
let dyn_img = DynamicImage::ImageRgb8(img);

The fact that DynamicImage has a copy_from method at all is a bug IMO, because as you observed it only works for Rgba8 and not any other color type.