load_image 3.3.2

Load PNG or JPEG with color profile support
Documentation 
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use rgb::*;

pub trait IsTransparentPixel {
    fn is_transparent(&self) -> bool;
}

impl IsTransparentPixel for RGBA8 {
    #[inline]
    fn is_transparent(&self) -> bool {
        self.a != 255
    }
}

impl IsTransparentPixel for RGBA16 {
    #[inline]
    fn is_transparent(&self) -> bool {
        self.a != 65535
    }
}

impl IsTransparentPixel for GrayAlpha<u8> {
    #[inline]
    fn is_transparent(&self) -> bool {
        self.a != 255
    }
}

impl IsTransparentPixel for GrayAlpha<u16> {
    #[inline]
    fn is_transparent(&self) -> bool {
        self.a != 65535
    }
}

#[inline]
pub fn is_opaque<T>(bitmap: &[T]) -> bool where T: IsTransparentPixel {
    !bitmap.iter().any(IsTransparentPixel::is_transparent)
}

#[test]
fn alphapx() {
    let a = vec![RGBA8::new(0, 0, 0, 255)];
    assert!(is_opaque(&a));

    let a = vec![GrayAlpha(0u8, 255)];
    assert!(is_opaque(&a));
    let a = vec![GrayAlpha(0u8, 254)];
    assert!(!is_opaque(&a));

    let a = vec![RGBA16::new(0, 0, 0, 255)];
    assert!(!is_opaque(&a));
    let a = vec![RGBA16::new(0, 0, 0, 65535)];
    assert!(is_opaque(&a));
}