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use super::super::Image;

/// Scales a frame to the given size, using nearest-neighbor interpolation.
pub fn scale<T>(
    width: usize,
    height: usize,
    frame: T
) -> Scale<T> {
    Scale { width, height, frame }
}

#[doc(hidden)]
pub struct Scale<T> {
    width: usize,
    height: usize,
    frame: T
}

impl<T: Image> Image for Scale<T> {
    type Pixel = T::Pixel;

    fn width(&self) -> usize { self.width }
    fn height(&self) -> usize { self.height }

    unsafe fn pixel(&self, x: usize, y: usize) -> Self::Pixel {
        self.frame.pixel(
            x * self.frame.width() / self.width,
            y * self.frame.height() / self.height
        )
    }
}