fn thumbnail_sample_fraction_both<I, P, S>(
    image: &I,
    left: u32,
    fraction_vertical: f32,
    bottom: u32,
    fraction_horizontal: f32
) -> (S, S, S, S)where
    I: GenericImageView<Pixel = P>,
    P: Pixel<Subpixel = S>,
    S: Primitive + Enlargeable,
Expand description

Get a single pixel for a thumbnail where the input window does not enclose any full pixel.