Function rsvg::surface_utils::srgb::map_unpremultiplied_components_loop

pub fn map_unpremultiplied_components_loop<F: Fn(u8) -> u8>(
    surface: &SharedImageSurface,
    output_surface: &mut ExclusiveImageSurface,
    bounds: IRect,
    f: F
)

Processing loop of map_unpremultiplied_components. Extracted (and public) for benchmarking.