Function gdl::elements::draw_opaque_rect

pub fn draw_opaque_rect(
    img: &mut DynamicImage, 
    background_color: &Rgb, 
    opacity: u8, 
    width: u32, 
    height: u32, 
    x_pos: i32, 
    y_pos: i32
)

Draw an opaque rectangle, where the opacity is set to a certain u8 value.

• img - A mutable ref to a DynamicImage.
• background_color - Rgb color of rectangle.
• opacity - The opacity of the rectangle.
• width - u32 - Desired width of rectangle.
• height - u32 - Desired height of rectangle.
• x_pos - X-coordinate of top corner of rectangle on img
• y_pos - y-coordinate of top corner of rectangle on img